Method and device for determining the state of a yarn.

专利摘要:
A projection section of the light (21) radiates the light in a sliding space of the yarn (13) by means of a light projection surface (32). The light comes out of the yarn sliding space (13) from a light receiving surface (33). A first light receiving section (41) receives the light which has passed through the yarn sliding space (13) and a second light receiving section (51) receives the light which does not pass through the yarn sliding space (13 ). A controller (61) controls a control value for driving the light projection section (21). The controller (61) identifies a fluctuation factor of the first light receiving section and / or of the second light receiving section on the basis of a quantity of light received from the first light receiving section (41), of a quantity of light received from the second light receiving section (51) and the control value for the drive.
公开号:CH708179B1
申请号:CH00877/14
申请日:2014-06-10
公开日:2018-06-29
发明作者:Tsukamoto Shinichi；Tokuda Kazuro；Miyake Yasuo
申请人:Murata Machinery Ltd；
IPC主号:

专利说明:

Description
Introduction to the invention 1. Field of the invention The present invention relates to a method and a device which optically determines the state of a yarn in motion. 2. Description of the known art [0002] During the production of the yarn, there are occasions when foreign substances are incorporated in the yarn or in which the thickness (apparent thickness) of the yarn varies considerably. The quality of the yarn deteriorates when the yarn contains foreign substances and / or when its thickness varies considerably.
[0003] In the art devices are known for determining the state of the yarn which optically detect the state of the yarn determining a thickness of the yarn and / or the presence / absence of foreign substances. Such devices for determining the state of the yarn comprise a light projection section (light source) and a light receiving section arranged around a sliding space of the yarn in which the yarn slides. The devices for determining the state of the yarn determine a state of the yarn by determining the thickness of the yarn and / or the presence / absence of foreign substances on the basis of a quantity of light received from the light receiving section.
[0004] The device for determining the state of the yarn comprises a light projection surface between the projection section of the light and the sliding space of the yarn and a surface for receiving the light between the light receiving section and the space of yarn flow. The light projection surface is an entry surface from which the light radiated by the light projection section enters the sliding space of the yarn. The light receiving surface is an exit surface from which the light radiated from the light projection section (not only the transmitted light, but also the light reflected from the yarn and / or from the peripheral elements) and which crosses the sliding space of the yarn comes out of the yarn sliding space. The light projection surface and the light receiving surface constitute, for example, a part of an outer peripheral surface of the yarn sliding space and are made of a resinous material which has light transmitting properties.
[0005] The device for determining the state of the yarn determines the state of the yarn based on the amount of light received from the light receiving section. When impurities are present on the light projection surface and / or on the light receiving surface, the amount of light received by the light receiving section may not correctly represent the state of the yarn. The impurities can be constituted by dust present in the atmosphere or by oil that adheres to a yarn in polyester and the like, or from honeydew present in cotton fibers. Furthermore, it may happen that the amount of light received by the light receiving section does not correctly represent the state of the yarn even when there is a fluctuation in the quantity of light projected by the light projection section (light source) due to a thermal drift of the light projection section. For example, when the room temperature increases, the amount of light emitted by a LED (light emitting diode) used in the light projection section tends to decrease.
[0006] When impurities are present and / or when the thermal drift occurs it is therefore not possible to correctly determine the state of the yarn solely on the basis of the quantity of light received from the light receiving section. There is therefore the need to identify the fluctuation factors (impurities and / or thermal drift) and to adopt a corrective action (for example the elimination of impurities) suitable for the identified fluctuation factors.
[0007] A device for the optical measurement of the diameter of a yarn is disclosed in the publication of the Japanese Patent examined H6-92 941. As illustrated for example in fig. 1 of this patent document, on one side of the light emission section there is a reference diode 6 able to compensate for the thermal drift. However, this patent document does not mention the identification of fluctuation factors.
Summary of the Invention [0008] An object of the present invention is to provide a method for determining the state of a yarn and a device for determining the state of a yarn which are capable of determining the presence / absence of a fluctuation factor ( that is, whether an alarm should be issued or not) that hinders the correct determination of the state of a yarn.
[0009] A method for determining the state of a yarn according to an aspect of the present invention is applicable to a device for determining the state of a yarn. The device for determining the state of a yarn comprises a projection section of the light which irradiates the light inside a sliding space of the yarn in which a yarn is arranged, a light projection surface consisting of an input surface from the which the light radiated by the light projection section enters the yarn sliding space, a light receiving surface consisting of an exit surface from which the light radiated by the light projection section and which passes through the yarn sliding space a first section for receiving the light that receives the light that has passed through the flow space of the yarn, a second section for receiving the light that receives the light radiated by the light projection section and does not come out of the yarn sliding space. crosses the yarn's sliding space and a controller that controls a control value for the az ionization of the light projection section. The method for determining the state of the yarn comprises an identification step in which the controller identifies a fluctuation factor of at least one of the first light receiving section and the second light receiving section based on a quantity of light received from the first light receiving section, of a quantity of light received from the second light receiving section and of the control value for the actuation.
[0010] A device for determining the state of the yarn according to another aspect of the present invention comprises a projection section of the light which radiates the light inside a sliding space of the yarn in which a yarn is arranged, a projection surface of light constituted by an entry surface from which the light radiated by the projection section of the light enters the sliding space of the yarn, a light-receiving surface consisting of an exit surface from which the light radiated by the light projection section and which passes through the sliding space of the yarn protrudes from the yarn sliding space, a first section for receiving the light that receives the light that has passed through the yarn sliding space, a second section for receiving the light that receives the light radiated from the projection section of the light and that does not cross the sliding space of the yarn and a co ntroller that controls a control value for driving the light projection section. The controller performs an identification process to identify a fluctuation factor of at least one of the first light receiving section and the second light receiving section based on the amount of light received from the first light receiving section, of the quantity of light received from the second light receiving section and the control value for the drive.
[0011] The aforesaid and other objects, features and advantages and the technical and industrial value of the present invention will become more understandable from reading the following detailed description of the currently preferred embodiments of the invention, if considered in relation to the attached drawings.
Brief description of the drawings [0012]
Fig. 1 is a simplified perspective view of a device 100 for determining the state of a yarn according to a first embodiment of the present invention; fig. 2 is a simplified cross-sectional view of the device 100 for determining the state of a yarn taken orthogonally with respect to a yarn Y present; fig. 3A is a simplified cross-sectional view of another example of the device 100 for determining the state of a yarn; fig. 3B is a simplified cross-sectional view of a further example of the device 100 for determining the state of a yarn; fig. 4 is a simplified drawing of a controller 61, a controller of the units (first controller 210) and a second controller 110; fig. 5 is a graph illustrating a case in which a projection surface of the light 32 and / or a light receiving surface 33 are free of impurities and an increase in the ambient temperature occurs; fig. 6 is a graph illustrating a case in which the projection surface of the light 32 and / or the light receiving surface 33 are free of impurities and the room temperature remains unchanged; fig. 7 is a graph illustrating a case in which the projection surface of the light 32 and / or the light receiving surface 33 are free of impurities and a drop in the ambient temperature occurs; fig. 8 is a graph illustrating a case in which impurities are present on the projection surface of the light 32 and / or on the light receiving surface 33 and a drop in the ambient temperature occurs; fig. 9 is a graph illustrating another example of a case in which impurities are present on the projection surface of the light 32 and / or on the light receiving surface 33 and a drop in the ambient temperature occurs; fig. 10 is a table that lists various models of fluctuation factors (various combinations of presence / absence of impurities and a variation of the ambient temperature) and a relationship between an increase / decrease of a control value for the drive with respect to a value of checking for comparison in an identification process and an increase / decrease of an amount of light received from a second light receiving section 51 with respect to an amount of light received for comparison; and fig. 11 is a table that lists the various combinations of the fluctuation factors (presence / absence of impurities and a variation of the room temperature) that can be hypothesized on the basis of the relationship between
Increase / decrease of the control value for actuation with respect to the control value for comparison in an identification process and increase / decrease in the amount of light received by the second light receiving section 51 with respect to the quantity of light received for comparison. .
Detailed description is given below of some exemplary embodiments of a device 100 for determining the state of a yarn according to the present invention with reference to the attached drawings. The device 100 for determining the state of a yarn is applied to a textile machine 200 and optically determines the state of a yarn in motion Y. The term "state" refers to a thickness (apparent thickness) and / or to the presence / absence of a foreign substance. The textile machine 200 to which the device 100 is applied to determine the state of a yarn is not subject to particular limitations. The device 100 for determining the state of a yarn can be applied, for example, to an automatic winding machine or to an air spinning machine. The device 100 for determining the state of a yarn can also be applied to textile machines 200 other than an automatic winding machine and an air spinning machine. The device 100 for determining the state of a yarn can also be applied to an inspection device which optically controls the state of a moving yarn.
[0014] Fig. 1 illustrates the device 100 for determining the state of a yarn which is arranged along a sliding path of the yarn Y. Fig. 2 shows a cross section of the device 100 for determining the state of a yarn taken orthogonally with respect to a yarn Y present. The device 100 for determining the state of a yarn mainly comprises a casing 11, a light projection section 21, a light projection surface 32, a light receiving surface 33, a first light receiving section 41, a second light receiving section 51, a controller 61 and a signaling section 71. The device 100 for determining the state of a yarn according to the present embodiment is of the biaxial type, i.e. the device 100 for determining the state of a yarn comprises two sets consisting of a light source and a light receiving section.
[0015] The casing 11 houses the light projection section 21, the projection surface of the light 32, the light receiving surface 33, the first light receiving section 41 and the second light receiving section 51. The yarn Y is arranged inside the casing 11. On one side of the casing 11 there is an opening 12. From the opening 12 towards the inside of the casing 11 there is a sliding space of the yarn 13 in which to place the yarn Y. Through the opening 12 of the wrapper 11 the yarn Y is introduced and arranged inside the sliding space of the yarn 13, and in that position the yarn Y slides perpendicularly to the surface of the sheet on which it is drawn fig. 2. The yarn Y is positioned inside the sliding space of the yarn 13 by means of yarn guides not shown which are arranged on the two sides of the sliding space of the yarn 13.
[0016] Inside the casing 11 there is a housing space 14 which houses the projection section of the light 21 and the second light receiving section 51. The housing space 14 comprises the paths of the light 141 and 142 which respectively guide the light beams D1 and D2 irradiated by the projection section of the light 21 in the sliding space of the yarn 13. In the present embodiment, the path of the light 141 and the sliding space of the yarn 13 are divided by a first transmitting plate 311 , which will be illustrated later, with light transmission properties. The path of the light 142 and the sliding space of the yarn 13 are subdivided by a second transmitting plate 312, which will be illustrated later, having light transmitting properties. The light paths 141 and 142 communicate through a communication space 143.
[0017] The projection section of the light 21 radiates the light in the sliding space of the yarn 13 in which the yarn Y is arranged. The projection section of the light 21 comprises a first light source 211 and a second light source 212. The first light source 211 radiates the light beam D1 and the second light source 212 radiates the light beam D2. The first light source 211 is arranged in the path of the light 141 and the second light source 212 is arranged in the path of the light 142. The light beams D1 and D2, irradiated respectively by the first light source 211 and the second light source 212, radiate the yarn. Y from different directions.
[0018] The first light source 211 and the second light source 212 are connected to the controller 61 (controller of the units [first controller 210]; see fig. 2 and 4). The controller 61 comprises a time division circuit not shown which controls the actuation of the first light source 211 and the second light source 212. The controller 61 controls the time division circuit to perform a high speed switching between the first source light 211 and the second light source 212, so that the light beams D1 and D2 are irradiated in alternating phases. Consequently, even if the yarn Y comprises portions having different thicknesses (apparent thicknesses) and / or contains foreign substances in distinct points of the yarn Y, these can be reliably determined. In the present embodiment, a CAN type LED is used as the first light source 211 and second light source 212. However, the LED does not necessarily have to be of the CAN type; for example, a surface mount LED can be used.
[0019] The first light receiving section 41 receives the light which has passed through the sliding space of the yarn 13. The first light receiving section 41 comprises an eleventh light receiving section 411 and a twelfth reception section of the light 412. The eleventh light receiving section 411 is arranged in front of the sliding space of the yarn 13 in a position in which it receives the light beam D1 radiated by the first light source 211. The twelfth light receiving section 412 is arranged in front of the sliding space of the yarn 13 in a position in which it receives the light beam D2 radiated by the second light source 212. The eleventh light receiving section 411 and the twelfth light receiving section 412 are connected to the controller 61 ( first controller 210). The eleventh light receiving section 411 and the twelfth light receiving section 412 emit signals corresponding to the force of the light received by sending them to the controller 61.
[0020] The light that has passed through the sliding space of the yarn 13 and is received by the first light receiving section 41 (the eleventh light receiving section 411 and the twelfth light receiving section 412) is a transmitted light and / or a reflected light which derives from the light radiated by the projection section of the light 21. The transmitted light is the light which, starting from the projection section of the light 21, directly reaches the first light-receiving section 41 without being reflected by the yarn Y and / or from peripheral elements. The reflected light is the light that reaches the first light receiving section 41 after having been reflected by the yarn Y and / or by peripheral elements.
[0021] In the present embodiment, the controller 61 alternately switches between driving the first light source 211 and the second light source 212. Consequently, when the first light source 211 is operated, the eleventh light receiving section 411 receives the transmitted light and the twelfth light receiving section 412 receives the reflected light. On the other hand, when the second light source 212 is operated, the twelfth light receiving section 412 receives the transmitted light and the eleventh light receiving section 411 receives the reflected light.
[0022] The projection surface of the light 32 is an entry surface from which the light radiated by the projection section of the light 21 (the first light source 211 and the second light source 212) enters the sliding space of the yarn 13. light receiving surface 33 is an exit surface from which the light radiated by the projection section of the light 21 (the first light source 211 and the second light source 212) which has passed through the sliding space of the yarn 13 protrudes from the space of yarn sliding 13.
[0023] In the present embodiment, the path of the light 141 and the sliding space of the yarn 13, as well as the twelfth light receiving section 412 and the sliding space of the yarn 13, are subdivided by the first transmitting plate 311, which it has light transmission properties. Similarly, the path of the light 142 and the sliding space of the yarn 13, as well as the eleventh light receiving section 411 and the sliding space of the yarn 13, are subdivided by the second transmitting plate 312, which is provided with the property of light transmission. This means that the projection surface of the light 32 and the light receiving surface 33 comprise the first transmitting plate 311 and the second transmitting plate 312. It is sufficient that the first transmitting plate 311 and the second transmitting plate 312 have the properties of light transmission. This means that these plates must be transmitting plates. For example, it is possible to use any structure that transmits only the light having a wavelength equal to the wavelength of the light radiated by the projection section of the light 21 (the first light source 211 and the second light source 212).
[0024] The impurities on the projection surface of the light 32 and / or on the light receiving surface 33, for example, may consist of dust present in the atmosphere, of oil adhering to the polyester yarn and the like, or of honeydew in cotton fiber. The impurities on the projection surface of the light 32 and / or on the light receiving surface 33 cause a fluctuation of the quantity of light received by the first light receiving section 41. When there is a fluctuation of the quantity of light received due to the impurities , the amount of light received by the first light receiving section 41 does not correctly indicate the state of the yarn Y. The fluctuation of the amount of light received due to impurities on the projection surface of the light 32 and / or on the light receiving surface 33 therefore acts as a fluctuation factor for the amount of light received by the first light receiving section 41. The term "received light quantity" refers to the amount of light radiated by the light projection section 21 (the first light source 211 and the second light source 212) which crosses the projection surface of the light 32 and the receiving surface of the light 33 and which is received by the first light receiving section 41.
[0025] Regardless of the presence / absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33, the thermal drift in the projection section of the light 21 causes a fluctuation of the quantity of projected light. When there is a fluctuation in the amount of light projected due to thermal drift, the amount of light received by the first light receiving section 41 does not correctly indicate the state of the yarn Y. The fluctuation in the amount of projected light due to thermal drift acts hence from fluctuation factor for the amount of light received from the first light receiving section 41.11 term "quantity of projected light" refers to the amount of light radiated by the projection section of the light 21 (the first light source 211 and the second source luminous 212). This means that the amount of light projected by the projection section of the light 21 is the amount of light radiated by the projection section of the light 21 before the light reaches the projection surface of the light 32 and is therefore not affected by the presence / absence of impurities on the light projection surface 32.
[0026] The second light receiving section 51 receives a part of the light beams D1 and D2 which are irradiated by the projection section of the light 21 (the first light source 211 and the second light source 212) and do not cross the sliding space of the yarn 13. The second light receiving section 51 acts as a monitoring element for the projected light. The second light receiving section 51 is connected to the controller 61 (controller of the units). The second light receiving section 51 emits and a signal corresponding to the force of the light received by sending it to the controller 61.
[0027] Since the second light receiving section 51 is arranged in the communication space 143, the second light receiving section 51 is able to correctly determine the quantity of light projected by the light projection section 21, independently of the presence / absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33. The impurities on the projection surface of the light 32 and / or on the light receiving surface 33 do not therefore act as a fluctuation factor for the amount of light received by the second light receiving section 51. On the other hand, the fluctuation of the amount of light projected by the projection section of the light 21 caused by the thermal drift causes a fluctuation of the quantity of light received by the second receiving section of the light 51. The second light receiving section 51 illustrated in fig. 2 is located at a point where it directly receives a part of the light beams D1 and D2 irradiated by the projection section of the light 21 (the first light source 211 and the second light source 212); however, the position of the second light receiving section 51 is not limited thereto. For example, as shown in figs. 3A and 3B, a structure is possible in which the second light receiving section 51 receives a part of the light beams D1 and D2 irradiated by the projection section of the light 21 through a reflecting plate 52. The reflecting plate 52 can have an appropriate shape and be placed in an appropriate position. Alternatively, a structure is possible in which the second light receiving section 51 receives a part of the light beams D1 and D2 through an optical conductor, such as an optical fiber.
[0028] The controller 61 controls a control value for actuating the projection section of the light 21 (the first light source 211 and the second light source 212). The control value for the drive is a light projection value currently used for driving the light projection section 21 (the first light source 211 and the second light source 212). The amount of projected light can be controlled by checking the control value for the drive.
[0029] The controller 61 identifies the fluctuation factor based on the quantity of light received from the first light receiving section 41, the quantity of light received by the second light receiving section 51 and the control value for the actuation. The fluctuation factors are the thermal drift and / or the impurities that hinder the correct determination of the state of the yarn Y. The controller 61 is for example able to determine the presence of impurities on the projection surface of the light 32 and / or on the surface of receiving light 33 as a fluctuation factor. If impurities are present on the projection surface of the light 32 and / or on the light receiving surface 33, the controller 61 determines that an alarm must be issued.
[0030] As already mentioned, the controller would carry out an identification process aimed at identifying the fluctuation factor which determines the fluctuation of the quantity of light received from the first light receiving section 41 and / or from the second light receiving section 51 on the basis of the amount of light received from the first light receiving section 41, of the amount of light received from the second light receiving section 51 and of the control value for the actuation. The identification process is performed when the yarn Y is not present in the sliding space of the yarn 13. The state in which the yarn Y is not present in the sliding space of the yarn 13 coincides with the start of the device and / or with the yarn break.
[0031] In this case, in the identification process, the controller 61 controls the control value for the drive so that the amount of light received by the first light receiving section 41 reaches a predetermined value. In the identification process, the controller 61 identifies the fluctuation factor based on the control value for the drive to which the amount of light received from the first light receiving section 41 reaches the predetermined value and the amount of light received from the second light receiving section 51.
[0032] More specifically, in the identification process the controller 61 identifies the fluctuation factor on the basis of the increase / decrease of the control value for the actuation with respect to a control value for the comparison and to the increase / decrease of the quantity of light received from the second light receiving section 51 with respect to a quantity of light received for comparison when the control value for the drive is controlled such that the amount of light received by the first receiving section of the light 41 reaches the predetermined value.
[0033] The process of controlling the control value for the drive so that the amount of light received by the first light receiving section 41 reaches the predetermined value in a condition where the yarn Y is not arranged in the space of Sliding of the yarn 13 is considered as a zero point correction process. The controller 61 is able to carry out the zero point correction process whenever a yarn break occurs.
[0034] The control value for the comparison is the control value for the drive (light projection current) obtained by controlling the control value for the drive so that the amount of light received by the first receiving section of the light 41 reaches the predetermined value in a condition in which the yarn Y is not arranged in the sliding space of the yarn 13. The control value for the comparison is the control value for the drive obtained during the stitch correction process. zero. The control value for the comparison is obtained in a time instant that precedes the time instant in which the identification process is performed. The zero point correction process in which the control value for the comparison is obtained must be considered as a first zero point correction process.
[0035] The amount of light received for comparison is the amount of light received from the second light receiving section 51 when checking the control value for the drive such that the amount of light received by the first receiving section of the light 41 reaches the predetermined value in a condition in which the yarn Y is not arranged in the sliding space of the yarn 13. The amount of light received for comparison is the quantity of light received by the second light receiving section 51 obtained during the zero point correction process. The amount of light received for the comparison is obtained in a time instant that precedes the time instant in which the identification process is performed. The zero point correction process in which the amount of light received for the comparison is obtained must be considered as a first zero-point correction process.
[0036] This means that the controller 61 executes the zero point correction process in a time instant that precedes the time instant in which it carries out the identification process and obtains the control value for the comparison and the quantity of light received for the comparison. In the identification process, the controller 61 obtains the control value for the drive and the amount of light received from the second light receiving section 51 in that time instant by performing the zero point correction process (a second correction process of the zero point), and respectively compares the control value for the drive obtained and the amount of light received with the control value for comparison and with the amount of light received for comparison. Based on the result of the comparison, the controller 61 determines if on the projection surface of the light 32 and / or on the light receiving surface 33 there are impurities and / or if a thermal drift has occurred in the light projection section 21. The control value for the comparison and the amount of light received for the comparison can be obtained, for example, during the zero point correction process (first zero point correction process) of the previous identification process. As a variant of the present embodiment, the control value for the comparison and the quantity of light received for the comparison can be obtained during the zero point correction process (first zero point correction process) of the identification process performed N times before the continuous identification process. As a further variant of the present embodiment it is also possible to use a control value for the comparison preset at the factory and a quantity of light received for comparison. Therefore there are no particular limitations regarding the moment in which the control value for the comparison and the quantity of light received for the comparison are obtained.
[0037] The controller 61 can be arranged inside the casing 11 or outside the casing 11 of the device to determine the state of the yarn 100. As shown in fig. 4, based on the teachings of the present embodiment, the controller is the controller of the units (first controller 210) of the textile machine 200 and is located outside the casing 11 of the device 100 to determine the state of a yarn. It is possible to provide an arrangement in which the control value for the drive (light projection current) is controlled to the controller (second controller 110) located inside the casing 11 of the device 100 to determine the state of a yarn. and to the unit controller (first controller 210) the identification process is performed. When this arrangement is adopted, the controller comprises both the controller of the units (first controller 210) arranged outside the enclosure 11 and the controller (second controller 110) disposed inside the enclosure 11. In this way the controller 61 it can be arranged inside and / or outside the casing 11. The controller 61 is not limited to a single controller.
[0038] The signaling section 71 emits an alarm for the operator when the controller 61 determines that it is necessary to issue this alarm. Alternatively, when the controller 61 identifies the fluctuation factor the signaling section 71 can indicate to the operator the fluctuation factor. The signaling section 71 can be constituted for example by a display unit. The signaling section 71 can be any display unit on the panel of the machine (display), a display unit for each unit (LED indicator and / or 7 segments), a display unit arranged in the casing 11 of the device 100 to determine the state of a yarn (LED indicator and / or 7 segments) or a combination of these. For example, when the controller 61 determines the presence of impurities, the signaling section 71 displays a message inviting the operator to remove the impurities on the projection surface of the light 32 and / or on the light receiving surface 33.
[0039] The identification process performed by the device to determine the state of the yarn 100 in order to identify the fluctuation factor is described below. The fluctuation factor that is identified is the fluctuation factor relative to the quantity of light received by the first light receiving section 41 which leads to the determination of the state of the yarn Y. In this case, the fluctuation factor includes the presence / absence of a fluctuation of the quantity of light projected by the projection section of the light 21 (the first light source 211 and the second light source 212) due to the presence / absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and / or thermal drift.
[0040] The various models assumed by the fluctuation factor (various combinations of presence / absence of impurities and a change in ambient temperature) are explained in the form of models with reference to figs. 5-9.
[0041] Fig. 5 is a graph illustrating a case in which the fluctuation factor is constituted by the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 with an increase in the ambient temperature. The vertical axes represent the quantity of light received from the first light receiving section 41 and from the second light receiving section 51 (projected light monitoring element). The horizontal axis represents the ambient temperature of the light projection section 21 (the first light source 211 and the second light source 212). The continuous line A represents the quantity of light received from the first light-receiving section 41 and from the second light-receiving section 51 in the time instant of the first zero-point correction process. The continuous line B represents the quantity of light received from the first light receiving section 41 and from the second light receiving section 51 in the instant in which the identification process is performed (at the instant of the second point correction process zero). The control value for the operation of the continuous line B is greater than the control value for the drive (light projection current) of the continuous line A. The ends of the continuous lines A and B are located lower down on the right side , since the amount of light projected by the projection section of the light 21 decreases as the room temperature increases due to the thermal drift, even if the control value for the drive remains unchanged.
[0042] As indicated by P1 on the continuous line A, the controller 61 controls the control value for the actuation in the time instant of the first zero-point correction process so that the amount of light received by the first receiving section of the light 41 reaches the predetermined value (amount of light received L11) at an ambient temperature T1. A control value for drive A1 is obtained in the time instant of the first zero point correction process as the control value for the comparison A1 and a quantity of light received L21 received from the second light receiving section 51 as the quantity of light received for comparison L21.
[0043] Assume that, in the time between the time instant of the first zero point correction process and the time instant of the identification process (at the time instant of the second zero point correction process), a temperature is reached room T2 (T1 <T2) and the amount of light projected by the projection section of the light 21 decreases (from P1 to P2) even if the control value for the drive A1 remains unchanged.
[0044] As indicated by the continuous line B, the controller 61 controls the control value for the actuation in the time instant of the identification process (in the time instant of the second zero point correction process) so that the quantity of light received from the first light receiving section 41 reaches the predetermined value (quantity of light received L11) at room temperature T2. In this case, the controller 61 increases the amount of light projected by the projection section of the light 21 (from P2 to P3) by increasing the control value for the drive (from A1 to A2) so as to restore the predetermined value (quantity of light received L11) of the amount of light received from the first light receiving section 41. Meanwhile, also the amount of light received by the second light receiving section 51 is restored to the received light quantity L21.
[0045] Therefore, when the fluctuation factor is constituted by the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by an increase in the ambient temperature, the control value for the actuation increases (for example from A1 to A2) with respect to the control value for comparison, and the amount of light received by the second light receiving section 51 remains unchanged (for example as a quantity of light received L21) with respect to the quantity of light received for the comparison in the time instant of the identification process (in the time instant of the second zero point correction process).
[0046] Accordingly, in the identification process, when the control value for the drive increases with respect to the control value for comparison and the amount of light received by the second light receiving section 51 remains unchanged with respect to the quantity of light received for comparison, the controller 61 determines the fluctuation factor as the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and an increase in the room temperature.
[0047] Fig. 6 is a graph illustrating a case in which the fluctuation factor is constituted by the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by no variation of the room temperature. The continuous line A represents the amount of light received from the first light receiving section 41 and from the second light receiving section 51 in the time instant of the first zero point correction process and the amount of light received from the first receiving section. of the light 41 and of the second light receiving section 51 in the time instant in which the identification process is performed (according to the zero point correction process).
[0048] As indicated by P1 on the continuous line A, the controller 61 controls the control value for the actuation in the time instant of the first zero point correction process so that the amount of light received by the first receiving section of the light 41 reaches the predetermined value (quantity of light received L11) at room temperature T1. The control value for drive A1 is obtained in the time instant of the first zero point correction process as the control value for the comparison A1 and the received light quantity L21 received by the second light receiving section 51 as the quantity of light received for comparison L21.
[0049] Assume that, in the time that elapses from the time instant of the first zero point correction process to the time instant of the identification process (at the time instant of the second zero point correction process), the ambient temperature T1 remains unchanged and that also the quantity of light projected by the projection section of the light 21 remains unchanged.
[0050] As indicated by the continuous line A, the controller 61 controls the control value for the actuation in the time instant of the identification process (in the time instant of the second zero point correction process) so that the quantity of light received from the first light receiving section 41 reaches the predetermined value (quantity of light received L11) at room temperature T1. In this case, the controller 61 maintains the control value for the drive (like A1). This means that the controller 61 maintains the amount of light projected from the projection section of the light 21 (such as P1) and also the predetermined value (amount of light received L11) of the amount of light received by the first light-receiving section 41. In the Meanwhile, also the amount of light received by the second light receiving section 51 remains unchanged as a quantity of light received L21.
[0051] Therefore, when the fluctuation factor is constituted by the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by no variation of the room temperature, the control value for the actuation remains unchanged (for example as A1) with respect to the control value for comparison, and also the quantity of light received by the second light receiving section 51 remains unchanged (for example as a quantity of light received L21) with respect to the quantity of light received for the comparison in the time instant of the identification process (in the time instant of the second zero point correction process).
[0052] Accordingly, in the identification process, when the control value for the drive remains unchanged with respect to the control value for comparison and the amount of light received by the second light receiving section 51 remains unchanged with respect to the quantity of light received for comparison, the controller 61 determines the fluctuation factor as the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and no change in the room temperature.
[0053] Fig. 7 is a graph illustrating a case in which the fluctuation factor is constituted by the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by a drop in the ambient temperature. The continuous line A represents the quantity of light received from the first light-receiving section 41 and from the second light-receiving section 51 in the time instant of the first zero-point correction process. The continuous line B represents the amount of light received from the first light receiving section 41 and from the second light receiving section 51 in the time instant in which the identification process is performed (in the time instant of the second correction process of the zero point).
[0054] As indicated by P1 on the continuous line A, the controller 61 controls the control value for the actuation in the time instant of the first zero point correction process so that the amount of light received by the first receiving section of the light 41 reaches the predetermined value (quantity of light received L11) at room temperature T1. The control value for drive A1 is obtained in the time instant of the first zero point correction process as the control value for the comparison A1 and the received light quantity L21 received by the second light receiving section 51 as the quantity of light received for comparison L21.
[0055] Assume that, in the time from the time instant of the first zero point correction process to the time instant of the identification process (at the time instant of the second zero point correction process), a temperature is reached environment T3 (T1> T3) and the amount of light projected by the light projection section 21 increases (from P1 to P2) even if the control value for drive A1 remains unchanged.
[0056] As indicated by the continuous line B, the controller 61 controls the control value for the actuation in the time instant of the identification process (in the time instant of the second zero point correction process) in such a way that the quantity of light received from the first light receiving section 41 reaches the predetermined value (quantity of light received L11) at room temperature T3. In this case, the controller 61 reduces the amount of light projected from the projection section of the light 21 (from P2 to P3) by decreasing the control value for the drive (from A1 to A3) so as to restore the predetermined value (quantity of light received L11) of the amount of light received from the first light receiving section 41. Meanwhile, also the amount of light received by the second light receiving section 51 is restored to the received light quantity L21.
[0057] Therefore, when the fluctuation factor is constituted by the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by a drop in the ambient temperature, the control value for the actuation decreases (for example from A1 to A3) with respect to the control value for comparison, and the amount of light received by the second light receiving section 51 remains unchanged (for example as a quantity of light received L21) with respect to the quantity of light received for the comparison in the time instant of the identification process (in the time instant of the second zero point correction process).
[0058] Accordingly, in the identification process, when the control value for the drive decreases with respect to the control value for comparison and the amount of light received by the second light receiving section 51 remains unchanged with respect to the quantity of light received for comparison, the controller 61 determines the fluctuation factor as the absence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and a drop in the ambient temperature.
[0059] Fig. 8 is a graph illustrating a case in which the fluctuation factor is constituted by the presence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by a drop in the ambient temperature. The continuous line A represents the amount of light received from the first light receiving section 41 and from the second light receiving section 51 in the time instant of the first zero point correction process and the amount of light received by the second receiving section. of the light 51 in the time instant in which the identification process is performed (in the time instant of the second zero point correction process). The dotted line A 'represents the quantity of light received by the first light receiving section 41 in the time instant in which the identification process is performed (in the time instant of the second zero point correction process).
[0060] As indicated by P1 on the continuous line A, the controller 61 controls the control value for the actuation in the time instant of the first zero point correction process so that the amount of light received by the first receiving section of the light 41 reaches the predetermined value (quantity of light received L11) at room temperature T1. The control value for drive A1 is obtained in the time instant of the first zero point correction process as the control value for the comparison A1 and the received light quantity L21 received by the second light receiving section 51 as the quantity of light received for comparison L21.
[0061] Assume that, in the time that elapses from the time instant of the first zero point correction process to the time instant of the identification process (at the time instant of the second zero point correction process), on the projection surface of the port 32 and / or on the light receiving surface 33 impurities accumulate and that the room temperature passes to T3 (T1> T3).
[0062] As indicated by P2 on the dashed line A ', the amount of light received by the first light receiving section 41 decreases (from L11 to L12) due to the impurities on the projection surface of the light 32 and / or on the surface of light reception 33. In the meantime, as indicated by P3 on the dotted line A ', the amount of light received by the first light receiving section 41 increases (from L12 to L11) due to a drop in the ambient temperature to T3 (T1 > T3). Therefore, based on fig. 8 it is possible to confirm that the decrease in the amount of light received by the first light receiving section 41 due to the impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and the decrease in the quantity of light received by the first light receiving section 41 due to a drop in room temperature cancel each other out, so that the amount of light received by the first light receiving section 41 remains unchanged (such as L11).
[0063] Meanwhile, as indicated by P4 on the continuous line A, the quantity of light received by the second light receiving section 51 is not affected by the impurities on the projection surface of the light 32 and / or on the light receiving surface 33 , and in fact increases (from L21 to L22) due to a drop in the ambient temperature at T3 (T1> T3).
[0064] As indicated by the continuous line A and the dashed line A ", the controller 61 controls the control value for the actuation in the time instant of the identification process (in the time instant of the second zero point correction process) so that the amount of light received by the first light receiving section 41 reaches the predetermined value (quantity of light received L11) at room temperature T3 In this case, the controller 61 maintains the control value for the drive (as A1) thus maintaining the quantity of light projected from the projection section of the light 21 (such as P3) and the predetermined value of the quantity of light received from the first light-receiving section 41 (as a quantity of light received L11).
[0065] In the meantime, the quantity of light received by the second light receiving section 51 is maintained at the increased value L22.
[0066] Therefore, when the fluctuation factor is constituted by the presence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by a drop in the ambient temperature, there are times when the control value for the drive it remains unchanged with respect to the control value for comparison (for example as A1) and the quantity of light received by the second light receiving section 51 increases with respect to the quantity of light received for comparison (for example from the quantity of light received L21 to L22) in the time instant of the identification process (in the time instant of the second zero point correction process).
[0067] Accordingly, in the identification process, when the control value for the drive remains unchanged with respect to the control value for comparison and the amount of light received by the second light receiving section 51 increases with respect to the quantity of light received for comparison, the controller 61 determines the fluctuation factor as the presence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and a drop in the ambient temperature.
[0068] Fig. 9 is a graph illustrating another example of a case in which the fluctuation factor is constituted by the presence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by a drop in the ambient temperature. The continuous line A represents the quantity of light received from the first light-receiving section 41 and from the second light-receiving section 51 in the time instant of the first zero-point correction process. The dotted line A 'represents the quantity of light received by the first light receiving section 41 in the time instant in which the identification process is performed (in the time instant of the second zero point correction process). The dotted line B 'represents the quantity of light received from the first light receiving section 41 in the time instant in which the identification process is performed (in the time instant of the second zero point correction process). The continuous line B represents the amount of light received by the second light receiving section 51 in the time instant in which the identification process is performed (in the time instant of the second zero point correction process).
[0069] As indicated by P1 on the continuous line A, the controller 61 controls the control value for the actuation in the time instant of the first zero point correction process so that the amount of light received by the first receiving section of the light 41 reaches the predetermined value (quantity of light received L11) at room temperature T1. Meanwhile, the control value for drive A1 is obtained as the control value for the comparison A1 and the received light quantity L21 received from the second light receiving section 51 as the amount of light received for the comparison L21.
[0070] Assume that, in the time from the time instant of the first zero point correction process to the time instant of the identification process (at the time instant of the second zero point correction process), on the projection surface of the port 32 and / or on the light receiving surface 33 impurities accumulate and that the room temperature passes to T3 (T1> T3).
[0071] As indicated by P2 on the dashed line A ", the amount of light received by the first light receiving section 41 decreases (from L11 to L12) due to impurities on the projection surface of the light 32 and / or on the surface of light reception 33. In the meantime, as indicated by P3 on the dotted line A ', the amount of light received by the first light receiving section 41 increases (from L12 to L13) due to a drop in the ambient temperature to T3 (T1 > T3) Therefore, as shown in Fig. 9, since the decrease in the amount of light received by the first light receiving section 41 due to the impurities on the projection surface of the light 32 and / or on the light receiving surface 33 is less than the decrease in the amount of light received by the first light receiving section 41 due to a drop in the ambient temperature, the amount of light received by the first light receiving section 41 increases. ta (from L11 to L13).
[0072] In the meantime, as indicated by P5 on the continuous line A, the quantity of light received by the second light receiving section 51 is not affected by the impurities on the projection surface of the light 32 and / or on the light receiving surface 33 , and in fact increases (from L21 to L22) due to a drop in the ambient temperature at T3 (T1> T3).
[0073] As indicated by the continuous line B and the dotted line B ", the controller 61 controls the control value for the actuation in the time instant of the identification process (in the time instant of the second zero point correction process) so that the amount of light received by the first light receiving section 41 reaches the predetermined value (quantity of light received L11) at room temperature T3 In this case, the controller 61 reduces the control value for the drive (from A1 to A3), thereby decreasing the amount of light projected by the projection section of the light 21 (from P3 to P4) to restore the predetermined value (quantity of light received L11) of the quantity of light received from the first receiving section of the light 41. Meanwhile, the amount of light received by the second light receiving section 51 decreases from L22 to L23.
[0074] Therefore, when the fluctuation factor is constituted by the presence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and by a drop in the ambient temperature, there are times when the control value for actuation it decreases with respect to the control value for comparison (for example from A1 to A3) and the quantity of light received by the second light receiving section 51 increases with respect to the quantity of light received for comparison (for example by the quantity of light received L21 to L23) in the time instant of the identification process (in the time instant of the second zero point correction process).
[0075] Accordingly, in the identification process, when the control value for the drive decreases with respect to the control value for comparison and the amount of light received by the second light receiving section 51 increases with respect to the quantity of light received for comparison, the controller 61 determines the fluctuation factor as the presence of impurities on the projection surface of the light 32 and / or on the light receiving surface 33 and a drop in the ambient temperature.
[0076] Fig. 10 is a table that lists the models of the fluctuation factors (various combinations of presence / absence of impurities and a variation of the ambient temperature), and a relationship between the increase / decrease of the control value for the actuation with respect to the value of control for comparison and increase / decrease of the amount of light received from the second light receiving section 51 with respect to the amount of light received for comparison in the identification process. Fig. 11 is a table that lists the various combinations of fluctuation factors (presence / absence of impurities and a change in ambient temperature) that can be hypothesized in the identification process based on the relationship between the increase / decrease of the control value for operation with respect to the control value for comparison and increase / decrease of the amount of light received by the second light receiving section 51 with respect to the amount of light received for comparison.
[0077] From figs 10 and 11 it is possible to determine that, when there is no fluctuation of the quantity of light received by the second light receiving section 51 with respect to the quantity of light received for comparison in the time instant of the identification process, the projection surface of the light 32 and / or the light receiving surface 33 are free of impurities. When the amount of light received by the second light receiving section 51 is increased in the time instant of the identification process, it is possible to determine that impurities are present on the projection surface of the light 32 and / or on the light receiving surface 33.
[0078] While the yarn Y is moving, the device 100 for determining the state of the yarn basically maintains the control value for actuation at a constant value (a value decided by the zero point correction process). However, the control value for the drive can be changed as explained below.
[0079] The controller 61 controls the control value for actuation based on the amount of light received by the second light receiving section 51 in a condition in which the yarn Y is arranged in the sliding space of the yarn 13 (in conditions of yarn sliding). This arrangement makes it possible to compensate for temperature fluctuation.
[0080] In this case, when the quantity of light received by the second light receiving section 51 decreases in a condition in which the yarn Y is arranged in the sliding space of the yarn 13, the controller 61 increases the control value for the actuation in such a way that the amount of light received by the second light receiving section 51 reaches the predetermined value. This means that, when the yarn Y is moving, the controller 61 adjusts the control value for the drive based on the amount of light received from the second light receiving section 51. Therefore, even when the temperature fluctuation occurs while yarn Y is moving, it can be corrected in real time.
[0081] When the amount of light received by the second light receiving section 51 increases in a condition in which the yarn Y is arranged in the sliding space of the yarn 13, the control would reduce the control value for the actuation in such a way that the amount of light received by the second light receiving section 51 reaches the predetermined value. Moreover, when the amount of light received by the second light receiving section 51 decreases in a condition in which the yarn Y is arranged in the sliding space of the yarn 13, the controller 61 increases the control value for the actuation in such a way that the amount of light received by the second light receiving section 51 reaches the predetermined value.
[0082] The device for determining the state of the yarn 100 according to the embodiment of the present invention has the following advantages.
[0083] The controller of the device for determining the state of the yarn determines whether an alarm should be issued based on the amount of light received from the first light receiving section, the amount of light received from the second light receiving section and the value control for the drive. The emission / non-emission of an alarm indicates the presence / absence of fluctuation factors that hinder the correct determination of the state of the yarn.
[0084] The controller of the device for determining the state of the yarn determines that an alarm must be issued when impurities are present on the light projection surface and / or on the light receiving surface. The presence of impurities on the light projection surface and / or on the light receiving surface can therefore be recognized as a fluctuation factor.
[0085] The device for determining the state of the yarn comprises a signaling section which emits an alarm when the controller determines that the alarm must be issued. Therefore, the operator can be informed of the presence of impurities on the light projection surface and / or on the light receiving surface so that he can undertake adequate corrective action.
[0086] The controller of the device for determining the state of the yarn performs an identification process in order to identify the fluctuation factor for the amount of light received from the first light receiving section and / or from the second light receiving section on the basis of the amount of light received from the first light receiving section, of the amount of light received from the second light receiving section and of the control value for the actuation. This means that the controller is able to determine and identify the presence of impurities and the occurrence of a thermal drift as distinct fluctuation factors.
[0087] The device for determining the state of the yarn comprises the signaling section which, once the controller has identified the fluctuation factors, indicates the identified fluctuation factors. The operator is therefore able to recognize the fluctuation factors distinctly and to take adequate corrective action.
[0088] The controller of the device for determining the state of the yarn controls the control value for the drive so that the amount of light received by the first light receiving section reaches the predetermined value, and identifies the fluctuation factor on the control value base for the drive at which the amount of light received by the first light receiving section reaches the predetermined value and the amount of light received from the second light receiving section. It is therefore possible to correctly determine the state of the yarn and identify the fluctuation factors separately.
[0089] The controller of the device for determining the state of the yarn identifies the fluctuation factors based on the increase / decrease of the control value for the drive with respect to the control value for the comparison, which is the control value for the drive obtained when the amount of light received by the first light receiving section reaches the predetermined value, and the increase / decrease in the amount of light received by the second light receiving section with respect to the amount of light received for comparison. It is therefore possible to identify separately the fluctuation factors based on the increase / decrease of the control value of the drive for comparison and the increase / decrease of the amount of light received by the second light receiving section.
[0090] The present invention is not limited to the embodiment described above. Several variants of the present invention are possible. For example, in the aforesaid embodiment a configuration of the device is presented for determining the state of the single stage yarn 100; the determination device can however have a two-stage configuration, with an object relating to the determination of a sliding speed of the yarn Y and / or any other object.
[0091] The device for determining the state of the yarn 100 is of the biaxial type, with two sets consisting of a light source and a light receiving section (a unit comprising the first light source 211 and the eleventh receiving section of the light 411 and the other unit comprising the second light source 212 and the twelfth light receiving section 412). However, the device for determining the state of the yarn 100 is not limited to the biaxial type. The device for determining the state of the yarn 100 can be of the monoaxial type and have a single set consisting of a light source and a light receiving section (different from the projected light monitoring element). Alternatively, it is possible to use a single set consisting of a light source and two or three sets consisting of a light receiving section (different from a projected light monitoring element).
[0092] A method for determining the state of the yarn according to an aspect of the present invention is applicable to a device for determining the state of the yarn. The device for determining the state of the yarn comprises a projection section of the light which irradiates the light in a sliding space of the yarn in which a yarn is arranged, a light projection surface consisting of an input surface from which the light radiates from the projection section of the light enters the sliding space of the yarn, a light-receiving surface consisting of an exit surface from which the light radiated by the projection section of the light and which passes through the sliding space of the yarn comes out of the space of yarn sliding, a first light receiving section which receives the light which has passed through the yarn sliding space, a second light receiving section which receives the light radiated by the light projection section and which does not pass through the space of yarn sliding and a controller that controls a control value for driving the yarn light projection section. The method for determining the state of the yarn comprises an identification step in which the controller identifies a fluctuation factor of at least one of the first light receiving section and the second light receiving section based on a quantity of light received from the first light receiving section, of a quantity of light received from the second light receiving section and of the control value for the actuation.
[0093] A device for determining the state of the yarn according to another aspect of the present invention comprises a projection section of the light which radiates the light in a sliding space of the yarn in which a yarn is arranged, a light projection surface formed from an inlet surface from which the light radiated by the projection section of the light enters the sliding space of the yarn, a light-receiving surface consisting of an exit surface from which the light radiated by the light projection section and which passes through the yarn sliding space comes out of the yarn sliding space, a first light receiving section that receives the light that has passed through the yarn sliding space, a second light receiving section that receives the light radiated by the light projection and that does not cross the flow space of the yarn and a controller that c checks a control value for driving the light projection section. The controller performs an identification process which serves to identify a fluctuation factor of at least one of the first light receiving section and the second light receiving section based on the amount of light received from the first light receiving section of the amount of light received from the second light receiving section and the ration control value.
[0094] The controller is able to perform the identification process in a condition in which the yarn is not arranged in the sliding space of the yarn.
[0095] The device for determining the state of the yarn can also comprise a signaling section which indicates the fluctuation factor identified by the controller.
[0096] The fluctuation factor may comprise impurities on at least one of the light projection surface and the light receiving surface.
[0097] In the identification process, the controller is able to identify the fluctuation factor based on the control value for the drive and the amount of light received by the second light receiving section to which the amount of light received by the first light receiving section reaches a predetermined value.
[0098] In the identification process, the controller is able to identify the fluctuation factor on the basis of an increase / decrease of the control value for the drive with respect to a control value for comparison and of an increase in value. reduction in the amount of light received by the second light receiving section with respect to the amount of light received for the comparison obtained when the control value for the drive is controlled such that the amount of light received by the first receiving section of light reaches the predetermined value.
[0099] The check value for the comparison can be a control value for the drive obtained when the control value for the drive is controlled so that the amount of light received by the first light receiving section reaches the predetermined value in a condition in which the yarn is not arranged in the sliding space of the yarn.
[0100] The amount of light received for comparison can be the amount of light received by the second light receiving section when the control value for the drive is controlled such that the amount of light received by the first receiving section of light reaches the predetermined value in a condition in which the yarn is not arranged in the sliding space of the yarn.
[0101] In the identification process, when the control value for the drive increases with respect to the control value for comparison and the amount of light received by the second light receiving section remains unchanged with respect to the quantity of light received for the comparison , the controller may determine that there is an absence of impurities and an increase in temperature.
[0102] In the identification process, when the control value for the drive remains unchanged with respect to the control value for comparison and the amount of light received by the second light receiving section remains unchanged with respect to the quantity of light received for the By comparison, the controller can determine that there is an absence of impurities and no change in temperature.
[0103] In the identification process, when the control value for the drive decreases with respect to the control value for comparison and the amount of light received by the second light receiving section remains unchanged with respect to

权利要求:
Claims (18)
[1]
at the amount of light received for comparison, the controller can determine that there is an absence of impurities and a drop in temperature. [0104] In the identification process, when the control value for the drive remains unchanged with respect to the control value for comparison and the amount of light received by the second light receiving section increases with respect to the quantity of light received for comparison. , the controller can determine that there is the presence of impurities and a drop in temperature. [0105] In the identification process, when the control value for the drive decreases with respect to the control value for comparison and the amount of light received by the second light receiving section increases with respect to the quantity of light received for comparison, the controller can determine that there is the presence of impurities and a drop in temperature. [0106] The controller is able to perform a correction process to check the control value for the drive based on the amount of light received from the second light receiving section. [0107] The controller is able to perform the correction process in a condition in which the yarn is arranged in the sliding space of the yarn. [0108] In the correction process, when there is a decrease in the amount of light received from the second light receiving section in a condition in which the yarn is arranged in the yarn sliding space, the controller can increase the control value for the actuation in such a way that the quantity of light received by the second light receiving section reaches the predetermined value. [0109] In the correction process, when there is an increase in the amount of light received by the second light receiving section in a condition in which the yarn is arranged in the yarn sliding space, the controller can reduce the control value for the actuation in such a way that the quantity of light received by the second light receiving section reaches the predetermined value. [0110] The device for determining the state of the yarn according to the present invention is able to identify the fluctuation factor which hinders the correct determination of the state of the yarn. [0111] Although for a clear and complete disclosure the invention has been described in relation to specific embodiments, these are not intended in any way to limit the attached claims, which should instead be interpreted as including all the variants and recognizable alternative constructions by the expert in the art who rightly fall into the basic teaching of the claims. claims
1. A method for determining the state of a yarn applied to a device for determining the state of a yarn, the device for determining the state of a yarn comprising a light projection section which is arranged to radiate light in a sliding space of the yarn in which a yarn is arranged; a projection surface of light constituted by an input surface from which the light radiated by the projection section of light enters the sliding space of the yarn; a light receiving surface consisting of an exit surface from which the light radiated by the light projection section and which passes through the yarn sliding space comes out of the yarn sliding space; a first light receiving section which is arranged to receive the light which has passed through the yarn sliding space; a second light receiving section which is arranged to receive the light radiated by the light projection section and which does not pass through the yarn sliding space; and a controller that controls a control value for driving the light projection section, in which the method for determining the state of the yarn comprises an identification step in which the controller identifies a fluctuation factor of at least one of the first light receiving section and the second light receiving section based on an amount of light received from the first light receiving section, a quantity of light received from the second light receiving section and the control value for the drive.
[2]
2. Device for determining the state of a yarn comprising: a light projection section which is arranged to radiate light in a sliding space of the yarn in which a yarn is arranged; a projection surface of light constituted by an input surface from which the light radiated by the projection section of light enters the sliding space of the yarn; a light receiving surface consisting of an exit surface from which the light radiated by the light projection section and which passes through the yarn sliding space comes out of the yarn sliding space; a first light receiving section which is arranged to receive the light which has passed through the yarn sliding space; a second light receiving section which is arranged to receive the light radiated by the light projection section and which does not pass through the yarn sliding space; and a Controller that controls a control value for driving the light projection section, in which the controller performs an identification process which serves to identify a fluctuation factor of at least one of the first light receiving section and the second light receiving section based on an amount of light received from the first light receiving section, an amount of light received from the second light receiving section and the control value for the actuation.
[3]
3. The device for determining the state of a yarn according to claim 2 in which the controller carries out the identification process in a condition in which the yarn is not arranged in the sliding space of the yarn.
[4]
4. The device for determining the state of a yarn according to claim 2 or 3, further comprising a signaling section indicating the fluctuation factor identified by the controller.
[5]
5. The device for determining the state of a yarn according to claim 4 wherein the fluctuation factor comprises the presence of impurities on at least one of the light projection surface and the light receiving surface.
[6]
6. The device for determining the state of a yarn according to any of the claims from 2 to 5 in which, in the identification process, the controller identifies the fluctuation factor based on the control value for the actuation and the quantity of light received from the second light receiving section to which the amount of light received by the first light receiving section reaches a predetermined value.
[7]
7. The device for determining the state of a yarn according to claim 6 wherein, in the identification process, the controller identifies the fluctuation factor based on an increase / decrease of the control value for the actuation with respect to a value of control for comparison and an increase / decrease in the amount of light received by the second light receiving section with respect to a quantity of light received for the comparison obtained when the control value for the drive is controlled such that the quantity of light received from the first light receiving section reaches the predetermined value.
[8]
8. The device for determining the state of a yarn according to claim 7 wherein the control value for the comparison is the control value for the drive obtained when the control value for the drive is controlled so that the amount of light received from the first light receiving section reaches the predetermined value in a condition in which the yarn is not arranged in the sliding space of the yarn.
[9]
9. The device for determining the state of a yarn according to claim 7 or 8 in which the quantity of light received for comparison is the quantity of light received by the second light receiving section when the control value for the actuation is controlled so that the amount of light received by the first light receiving section reaches the predetermined value in a condition in which the yarn is not arranged in the yarn sliding space.
[10]
10. The device for determining the state of a yarn according to any one of the claims from 6a9 wherein, in the identification process, when the control value for the drive increases with respect to the control value for the comparison and the quantity of light received by the second light receiving section remains unchanged with respect to the amount of light received for comparison, the controller determines that there is an absence of impurities and an increase in temperature.
[11]
11. The device for determining the state of a yarn according to any one of claims 6 to 10 wherein, in the identification process, when the control value for the drive remains unchanged with respect to the control value for comparison and quantity of light received from the second light receiving section remains unchanged with respect to the amount of light received for comparison, the controller determines that there is an absence of impurities and no change in temperature.
[12]
12. The device for determining the state of a yarn according to any of the claims from 6 to 11 wherein, in the identification process, when the control value for the actuation decreases with respect to the control value for the comparison and the quantity of light received by the second light receiving section remains unchanged with respect to the amount of light received for comparison, the controller determines that there is an absence of impurities and a drop in temperatures.
[13]
13. The device for determining the state of a yarn according to any one of claims 6 to 12 wherein, in the identification process, when the control value for the drive remains unchanged with respect to the control value for comparison and quantity of light received by the second light receiving section increases with respect to the amount of light received for comparison, the controller determines that there is the presence of impurities and a drop in temperature.
[14]
14. The device for determining the state of a yarn according to any one of claims 6 to 13 wherein, in the identification process, when the control value for the actuation decreases with respect to the control value for the comparison and the quantity of light received by the second light receiving section increases with respect to the amount of light received for comparison, the controller determines that there is the presence of impurities and a drop in temperature.
[15]
15. The device for determining the state of a yarn according to any one of Claims 2 to 14 in which the controller performs a correction process to control the control value for actuation based on the amount of light received from the second section of light reception.
[16]
16. The device for determining the state of a yarn according to claim 15 in which the controller performs the correction process in a condition in which the yarn is arranged in the sliding space of the yarn.
[17]
17. The device for determining the state of a yarn according to claim 16 wherein, in the correction process, when there is a decrease in the amount of light received by the second light receiving section in a condition in which the yarn is arranged in the flow space of the yarn, the controller increases the control value for the drive so that the amount of light received by the second light receiving section reaches the predetermined value.
[18]
18. The device for determining the state of a yarn according to claim 16 or 17 wherein, in the correction process, when there is an increase in the amount of light received from the second light receiving section in a condition in which the yarn is arranged in the yarn sliding space, the controller reduces the control value for the drive so that the amount of light received by the second light receiving section reaches the predetermined value.

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同族专利:

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公开号 | 公开日

---

JP6241087B2|2017-12-06|

---

CH708179A2|2014-12-15|

---

CN104237253B|2018-09-14|

---

JP2015001433A|2015-01-05|

---

IN2014CH02841A|2015-09-04|

---

DE102014211249A1|2014-12-18|

---

CN104237253A|2014-12-24|

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法律状态:
2022-01-31| PL| Patent ceased|

优先权:

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申请号 | 申请日 | 专利标题

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JP2013125793A|JP6241087B2|2013-06-14|2013-06-14|Yarn state detection method and yarn state detection device|

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