• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An apparatus for adjusting the pressure of compressed air for inserting the weft thread into an air jet type loom includes an electro-pneumatic regulator which has a pressure adjusting unit comprising a diaphragm, a chamber. primary and a secondary chamber; an air supply solenoid valve which regulates the supply of compressed air; an air release solenoid valve which regulates the release of compressed air; a pilot valve which regulates the flow of compressed air; and an air release valve which regulates the release of compressed air. A lower limit pressure of the weft thread inserting pressure is set to be lower than the weft thread inserting pressure at the end of a first weft thread insert after the start of the weft-type loom. air jet.
    公开号:BE1022324B1
    申请号:E2014/0752
    申请日:2014-10-21
    公开日:2016-03-25
    发明作者:Yoichi Makino；Morita Akito
    申请人:Kabushiki Kaisha Toyota Jidoshokki；
    IPC主号:
    专利说明:

    AIR JET-TYPE WEAVING MACHINE AND APPARATUS FOR ADJUSTING THE COMPRESSED AIR PRESSURE IN A JET-TYPE WEAVING MACHINE
    AIR
    BASIS OF THE INVENTION
    The present invention relates to an apparatus for adjusting the compressed air pressure for inserting the weft yarn into an air jet type loom. More specifically, the invention relates to an apparatus for regulating the pressure of the compressed air for the insertion of the weft yarn, which is to be supplied to a main nozzle and to a secondary nozzle of a jet-type loom. air. Generally, in an air jet type loom, the pressure of the compressed air for insertion of weft yarn, which is to be fed from a feed source of air is reduced by a regulator to a level that is suitable for insertion of the weft yarn. As a result, compressed air whose pressure has been reduced is supplied to a main nozzle and a secondary nozzle of an air jet type loom. In order to be able to meet the requirements related to the operation of the high-speed loom of 1000 revolutions per minute or more, air jet looms of recent years use an electro-pneumatic regulator instead of a regulator. hand operated or motor driven, such as that used in a fluid jet type loom disclosed in Japanese Unexamined Patent Application Publication No. 6-73640.
    The fluid jet type loom of the publication cited above is equipped with a pressure regulating valve disposed adjacent to the fluid pressure supply for setting an optimum fluid pressure. for inserting and transferring a weft thread. An electric pressure regulating valve, in which a pressure sensor is incorporated, is frequently used in order to maintain an optimal condition of weft transfer by automatic pressure control during the operation of the loom. fluid jet type. The electric pressure regulating valve provides feedback control by sending the pressure detected by the pressure sensor from the outlet side of the control valve to the counterpressure chamber at the inlet side of the control valve. Then, the pressure regulating electric valve adjusts its opening via a diaphragm that can be moved in response to the pressure difference between the inlet side and the outlet side of the control valve to thereby achieve the desired outlet pressure.
    In an air jet loom in which compressed air is consumed for the insertion of the weft yarn, the insertion pressure of the weft yarn drops each time one proceeds to a machine. insertion of the weft thread. When the pressure sensor detects a drop in the insertion pressure of the weft yarn, the electropneumatic regulator performs a reaction control in response to the pressure drop detected by the pressure sensor to supply compressed air directly to the pressure sensor. output side. As a result, the electropneumatic regulator disclosed in the above-mentioned publication proceeds roughly 1,000 times per minute to reaction control. The implementation of the feedback control for each weft insertion may result in a repeated overflow of weft insertion pressure, which makes it difficult to maintain the weft thread insertion pressure. in a range that is suitable for inserting the weft yarn.
    Variations in the weft insertion pressure for weft thread insertion give rise to variations in the moment at which the inserted weft thread reaches a predetermined position in the loom; that is, on the side opposite to that of the main weft insertion nozzle, giving rise to a failure with respect to insertion of the weft yarn. Such a defective insertion of the weft yarn due to variations in the weft arrival time decreases the quality of the resulting fabric and deteriorates the operating efficiency of the air jet type loom. In addition, it can be faced with frequent actuation of the electropneumatic regulator, which shortens the life of the electropneumatic regulator significantly. The object of the present invention is to provide an electropneumatic regulator in an air jet loom which suppresses variations in the pressure of the compressed air for insertion of the weft yarn.
    SUMMARY OF THE INVENTION
    In accordance with one aspect of the present invention, there is provided an apparatus for adjusting the pressure of the compressed air for insertion of the weft yarn to be fed from an air supply source to an insertion nozzle. of weft yarn via a tank for air at a target pressure via an electropneumatic regulator in a jet loom of the air jet type. The electropneumatic regulator includes a pneumatic spring type pressure control unit having a diaphragm, a primary chamber formed on one side of the diaphragm and a secondary chamber which is formed on the other side of the diaphragm, the secondary chamber being communication with the tank for air; a pilot valve which adjusts the flow of compressed air flowing between the air supply source and the air reservoir in response to the movement of the diaphragm; an electromagnetic air supply valve which regulates the supply of compressed air from the air supply source to the primary chamber of the diaphragm and which is controlled based on the pressure in the reservoir for the air; an electromagnetic air release valve which regulates the release of compressed air into the primary chamber to the atmosphere and is controlled based on the pressure in the air reservoir; and an air release valve which adjusts the release of the compressed air into the secondary chamber to the atmosphere in response to the movement of the diaphragm. In the apparatus for adjusting the pressure of the compressed air in the air jet type loom, the lower pressure pressure of the weft insertion nozzle which determines the corresponding moment at the start of the activation of the electromagnetic air supply valve is set to be lower than the insertion pressure of the weft thread after a first insertion of the frame wire after the start of the loom of the air jet type. Other aspects and advantages of the invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate by way of example the principles of the invention. The invention also relates to a loom of the air jet type comprising an apparatus for adjusting the pressure of the compressed air as described above for the insertion of the frame wire to be fed from a source of air. air supply in the loom of the air jet type.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with its objects and advantages, can best be understood by reference to the following description of the presently preferred embodiments, together with the accompanying drawings in which: FIG. 1 is a block diagram showing a piping system for compressed air in an air jet type loom having an apparatus for adjusting the pressure of compressed air, in accordance with a form of embodiment of the present invention; Fig. 2 is a diagram which schematically shows the configuration of an electropneumatic regulator of the piping system of Fig. 1; FIG. 3 is a graph showing the variation of the insertion pressure of the weft yarn set by the electropneumatic regulator; FIG. 4 is a diagram in which the operation of the electropneumatic regulator is schematically represented when the electromagnetic air supply valve of the electropneumatic regulator is not activated; FIG. 5 is a diagram in which the operation of the electropneumatic regulator is schematically represented when the electromagnetic pneumatic supply valve of the electropneumatic regulator is activated.
    DETAILED DESCRIPTION OF THE EMBODIMENTS
    Hereinafter, an embodiment of the apparatus for adjusting the compressed air pressure in the air jet type loom according to the present invention will be described with reference to FIGS. Referring to Fig. 1, reference numeral 1 denotes an air jet type loom and numeral 2 denotes a piping system for compressed air in a weft yarn insertion apparatus of the present invention. loom 1 of the air jet type. An air supply source 3 that is mounted in a textile plant includes equipment such as an air compressor and a dryer (neither of which is shown) and supplies compressed air to the loom. weaving the air jet type via a pipe 4. The pipe 4 is connected to a pipe 6 of the loom 1 of the air jet type via an initial pressure valve 5 provided in the loom 1 of the type with air jet. The initial pressure valve 5 regulates the supply of compressed air to the loom 1 of the air jet type.
    A filter 7 is connected in the pipe 6 and a pressure gauge 8 is connected in the pipe 6 downstream of the filter 7 when looking in the flow direction of the fluid. The pressure gauge 8 measures the initial pressure of the compressed air supplied from the air supply source 3. The initial pressure is pre-set to a level which is greater than that of the insertion pressure. weft yarn of the loom 1 of the air jet type for insertion of the weft yarn. The pressure gauge 8 is connected to a main tank for the air 10 in the line 6 via an electropneumatic regulator 9. A pressure gauge 11 is connected to the line 6 between the electropneumatic regulator 9 and the main tank for the air 10.
    The electropneumatic regulator 9 reduces the initial pressure of the compressed air to a weft insertion pressure or pressure which represents a pre-set pressure which is suitable for insertion of the weft yarn. The compressed air reduced to the insertion pressure of the weft thread feeds the main tank for air and is stored therein. The pressure gauge 11 measures the pressure of the compressed air stored in the main tank for air 10, i.e., the main nozzle pressure (or the weft insertion pressure) to verify whether or not the pressure prevailing in the main nozzle 13 corresponds to the preset pressure. A main air valve 12 is connected in line 6 between the main air tank 10 and the main nozzle (or the weft insertion nozzle) 13. The main air valve 12 adjusts supplying compressed air to the main nozzle 13. It should be indicated that the main air tank 10 corresponds to the air tank of the present invention.
    A pipe 14 forks from the pipe 6 connecting the pressure gauge 8 and the electropneumatic regulator 9 and is connected via a throttle valve 15 to the pipe 6 which connects the main valve for the air 12 and the main nozzle 13 to thereby form a breeze circuit 16. Accordingly, a small amount of air that is controlled by the throttle valve 15 supplies the main nozzle 13 steadily, even when weft insertion marks a pause. . Since the breeze is fed continuously from the main nozzle 13 while the weft insertion is paused, the pointed end of the inserted weft yarn is kept stable.
    A pipe 17 bifurcates from the pipe 6 connecting the pressure gauge 8 and the electropneumatic regulator 9 and is connected to a secondary tank for the air 19 via an electropneumatic regulator 18 which has essentially the same configuration and the same functions as those 9. The pipe 17 connecting the electropneumatic regulator 18 and the secondary tank for the air 19 is provided with a pressure gauge 20. The electropneumatic regulator 18 reduces the initial pressure of the compressed air supplied by the source of the electropneumatic regulator. supplying air 3 at a pressure for secondary nozzles (or at a weft insertion pressure) which is suitable for insertion of the weft yarn via a host of warp yarns. Thus, the compressed air that is set at the secondary nozzle pressure is stored in the secondary tank for air 19. It will be appreciated that the set nozzle pressure and the main nozzle set pressure are essentially the same. It should be indicated that the secondary air reservoir 19 corresponds to the air reservoir of the present invention.
    The secondary tank for air 19 is connected via line 17 to four secondary air valves 21 which are arranged in the insertion direction of the weft yarn. A plurality of secondary nozzles (or weft insertion nozzles) are subdivided into four groups 22 and subgroups of nozzles 22 are arranged in the insertion direction of the weft yarn. The secondary air valves 21 are connected to the respective subgroups of nozzles 22 via the pipes 17. Therefore, when the secondary air valve 21 is activated, compressed air supplied by the secondary reservoir for the air supply 21 The air 19 having the specified secondary nozzle pressure is also supplied to the sub-group of nozzles 22 which corresponds to the secondary valve for the activated air 21, thereby assisting in the insertion of the weft yarn.
    The pressure gauges 8, 11 and 20 are electrically connected to a control unit 24 equipped with a control panel 23 and send measurement data relating to the initial pressure, the main nozzle pressure and the secondary nozzle pressure to the pump. The control unit 24 includes a storage part (not shown) which stores various set values, as well as data sent by the pressure gauges 8, 11 and 20 and an operational part (not shown). ) which performs various calculations based on the initial pressure, the main nozzle pressure and the secondary nozzle pressure.
    In addition, a control program (not shown) for controlling the power supply to the electro-pneumatic controller 9, 18 and a program (not shown) for pressure setting instructions are stored in the control unit. 24. The control unit 24 has different programs for the operation of the loom 1 of the air jet type and, at the time of insertion of the weft thread, controls the beginning and the end of the movement of inserting the weft yarn by sending signals to the main air valves 12 and to the secondary air valves 21. It should be indicated that the control unit 24 corresponds to the device for adjusting the pressure compressed air in an air jet loom of the present invention.
    The electropneumatic regulators 9, 18 have essentially the same configuration. Therefore, in the present embodiment, only the configuration of the electropneumatic regulator 9 will be described in detail with reference to FIG. 2. The electropneumatic regulator 9 includes a pneumatic spring type pressure control unit 25, a flapper pilot 26, an air release valve 27, an electromagnetic air supply valve 28 and an electromagnetic air release valve 29. The pneumatic spring type pressure control unit 25 has a diaphragm 30 which is disposed in the housing, a primary chamber 31 formed in the housing on one side of the diaphragm 30 and a secondary chamber 32 formed in the housing on the other side of the diaphragm 30. The diaphragm 30 is capable of to move towards the side of the primary chamber 31 or the side of the secondary chamber 32, in response to the pressure difference between the primary chamber 31 and the chamber is 32.
    The primary chamber 31 is connected to the electromagnetic valve 28 for supplying air and to the electromagnetic valve 29 for releasing the air via a passage 33. The electromagnetic valve 28 for supplying the air and the electromagnetic valve 29 are electrically connected to the control unit 24 and are activated to open or close in response to an instruction from the control unit 24. the air is connected via a passage 34 to the pipe 6 which is connected to the air supply source 3. When the electromagnetic valve 28 of the air supply is open, the compressed air subjected to the pressure The electromagnetic valve 29 for the release of air has an air release orifice 35 which is open to the atmosphere. When the electromagnetic valve 29 of air release is open, the compressed air in the primary chamber 31 is released into the atmosphere via the air release orifice 35.
    The pilot valve 26 has an inlet 36 connected to the air supply source 3 via the pipe 6 and an outlet 37 connected to the main tank for the air 10 via the pipe 6. The pilot valve 26 is connected to the diaphragm 30 of the pneumatic spring type pressure control unit 25 and is activated to open and close in response to the displacement of the diaphragm 30. Specifically, the pilot valve 26 opens when the pressure of the primary chamber 31 is greater than the pressure of the secondary chamber 32 and closes when the pressure of the secondary chamber 32 is in equilibrium with the pressure of the primary chamber 31 or is greater than said pressure. When the pilot valve 26 is open, compressed air subjected to high pressure at the air supply source 3 flows from the air supply source 3 to the main reservoir for air 10. It should be indicated that the pipe 6 which is connected to the outlet 37 of the pilot valve 26 communicates with the secondary chamber 32 via a passage 38.
    The air release valve 27 has a passage 39 which communicates with the secondary chamber 32 and an air release port 40 which is open to the atmosphere. As was the case for the pilot valve 26, the air release valve 27 opens and closes in response to the displacement of the diaphragm 30. Specifically, the air release valve 27 closes when the pressure of the primary chamber 31 is in equilibrium with the pressure of the secondary chamber 32 or is greater than said pressure. When the pressure of the secondary chamber 32 is greater than the pressure of the primary chamber 31, the diaphragm 30 moves in a direction which causes the opening of the air release valve 27. Therefore, the compressed air in the secondary chamber 32, that is to say the compressed air on the outlet side 37 of the pilot valve 26 is discharged via the air release orifice 40 and flows through the passage 38, the chamber secondary 32 and passage 39.
    The set values associated with the pressure adjustment by the electro-pneumatic regulator 9 will now be described with reference to FIG. 3. The target pressure of the main nozzle of the compressed air stored in the main tank for air 10 is set at PT and this value is previously stored in the control unit 24. The electropneumatic regulator 9 adjusts the main nozzle pressure so as to adjust the pressure to the target pressure PT. In addition, the pressure PL is set which represents the lower limit pressure which determines the moment corresponding to the start of the actuation of the electromagnetic valve 28 for supplying the air and the pressure PU which represents the upper limit pressure which determines the time corresponding to the start of the actuation of the electromagnetic valve 29 of air release, for the main nozzle pressure and stores said pressures in the control unit 24.
    The lower limit pressure PL is set at a pressure which is lower than the main nozzle pressure PI at the end of the first insertion of weft yarn following the start of the loom 1 of the air jet type and which is also superior at the main nozzle pressure P2 at the end of the second weft insertion. According to the present embodiment of the invention, the lower limit pressure PL is set at a level which lies between the weft insertion pressure Pi and the weft insertion pressure P2. The upper limit pressure PU is set according to the sum of the target print PT and the difference between the target pressure PT and the lower pressure limit PL.
    For example, when the lower limit pressure PL is set to be greater than the main nozzle pressure PI at the end of the first insertion of the weft yarn after the start of the air jet type loom 1, the solenoid valve 28 and the electromagnetic valve 29 of air release are activated, while the main nozzle pressure is reduced during the insertion of the weft yarn, which gives rise to frequent adjustment pressure, unfavorable. Specifically, the adjustment of the pressure of the electromagnetic air supply valve 28 which is activated at each insertion of weft thread gives rise to an overshoot, and the electromagnetic valve 29 of the air release is activated. at each insertion of the weft thread. Based on the frequent setting of the pressure, the main nozzle pressure may not reach the target pressure PT. Frequent activation of the electromagnetic air supply valve 28 and the electromagnetic air release valve 29 may result in degradation of any component of the electromagnetic valves 28, 29.
    For example, when the lower limit pressure PL is set to be lower than the main nozzle pressure P2, the electromagnetic valve 28 for supplying air can be activated at the third insertion of the frame wire and subsequent insertions of the wire. weft due to a drop in the pressure of the main nozzle. As a result, the beginning of the pressure setting is delayed and the pressure drop of the main nozzle after the start of the air jet type loom 1 can be detected, so that one can be confronted with a failure in the insertion of the weft thread.
    The adjustment of the main nozzle pressure by the electropneumatic regulator 9 will now be described with reference to FIGS. 3 to 5. When starting the operation of the loom 1 of the air jet type, the pressure gauge 11 detects the pressure of the compressed air (the pressure of the main nozzle) downstream of the electropneumatic regulator 9 and sends the detected pressure data to the control unit 24. As shown in FIG. 3, the first insertion of weft yarn starts after the start of the loom 1 of the air jet type and therefore the main nozzle pressure drops. However, since the main nozzle pressure PI at the end of the weft insertion is not reduced to the lower limit pressure PL, the control unit 24 does not send any instruction for opening the electromagnetic valve 28 for supplying air to the electropneumatic regulator 9.
    Consequently, the electromagnetic air supply valve 28 and the electromagnetic air release valve 29, of the electropneumatic regulator 9, are maintained in the closed state, as shown in FIG. The pressure in the secondary chamber 32 of the pneumatic spring type pressure control unit 25 is decreased due to the variation of the main nozzle pressure. As a result, the diaphragm 30 under the influence of the pressure of the primary chamber 31 is moved towards the secondary chamber 32, specifically from the position indicated by the imaginary line to the position indicated by the solid line. Figure 4, so that the pilot valve 26 is open. The opening of the pilot valve 26 allows compressed air under high pressure to flow from the side corresponding to the air supply source 3 in the direction of the pipe 6 on the side corresponding to the main reservoir for the air 10 through the outlet 37 of the pilot valve 26, which increases the main nozzle pressure. Since the pressure in the primary chamber 31 at the start of the jet loom 1 of the air jet type is not high enough to move the diaphragm 30 significantly, the main nozzle pressure can not increase until at the target pressure PT.
    As shown in Fig. 3, since the main nozzle pressure is decreased at the time of the first weft insertion, the second weft thread insertion starts with a main nozzle pressure which is lower than the target pressure. PT. As a result, the main nozzle pressure drops further towards the lower limit pressure PL at the moment A indicated in FIG. 3 and drops even more before the end of the second weft insertion. The control unit 24 constantly compares the data of the detected pressures of the main nozzle transmitted by the pressure gauge 11 to the lower limit pressure PL stored in the control unit 24. When the control unit 24 determines that the detected main nozzle pressure is below the lower limit pressure PL, the control unit 24 transmits an instruction to activate the electromagnetic valve 28 for supplying air.
    The solenoid of the electromagnetic valve 28 for supplying air is excited in response to an instruction from the control unit 24 and opens as shown in FIG. 5. side of the air supply source 3 flows into the primary chamber 31 of the pneumatic spring type pressure regulating unit 25 through the passage 34, the electromagnetic valve 28 for supplying the air. The pressure in the primary chamber 31 increases under the influence of said compressed air under high pressure, which triggers the displacement of the diaphragm 30 from the position indicated by the imaginary line to the position indicated by FIG. solid line in Figure 5, giving rise to the opening of the pilot valve 26. The compressed air under high pressure in the pipe 6 on the side corresponding to the air supply source 3 flows into the pipe 6 on the side corresponding the main tank for air 10 through the inlet 36 and the outlet 37 of the pilot valve 26, so that the main nozzle pressure increases. The number of activations of the electromagnetic air supply valve 28 in response to the instruction emanating from the control unit 24 as well as the duration of such activation of the electromagnetic valve 28 for supplying the air. air are predetermined. The main nozzle pressure is lowered to P2 at the end of the second weft insertion and then rapidly increases in response to the activation of the electromagnetic valve 28 for supplying air. The third weft insertion starts before the main nozzle pressure reaches the upper pressure limit PU. Since the solenoid valve 28 is activated and the main nozzle pressure is increased, the main nozzle pressure at the end of the third weft insertion is not less than the limiting pressure lower PL. As a result, the control unit 24 does not transmit an activation instruction to the electromagnetic valve 28 for supplying air. As shown in FIG. 4, the electromagnetic valve 28 for supplying air and the electromagnetic valve 29 for releasing air are closed. However, the main nozzle pressure is decreased at the end of the third weft insertion and therefore the pressure in the secondary chamber 32 is decreased. Therefore, the diaphragm 30 under the influence of the pressure of the primary chamber 31 moves from the position corresponding to the imaginary line to the position indicated by the solid line.
    Following the displacement of the diaphragm 30, the pilot valve 26 opens and the compressed air under high pressure on the side corresponding to the air supply source 3 flows towards the main tank for the air 10 to thereby increase the main nozzle pressure. The pressure in the primary chamber 31 at the end of the third weft insertion is sufficiently high, since the electromagnetic valve 28 for supplying air is activated. Therefore, the displacement of the diaphragm 30 is large and a sufficient amount of compressed air under high pressure feeds the main tank for the air 10 thereby to increase the main nozzle pressure beyond the target pressure PT. The decrease in the main nozzle pressure that results from the third weft insertion is suppressed by the displacement of the diaphragm 30 due to the variation of the main nozzle pressure, and the main nozzle pressure is maintained around the target pressure PT.
    In this embodiment, the upper limit pressure PU and the lower limit pressure PL are set so that the differences between the target pressure PT and these upper and lower limit pressures PU and PL are equal. However, in accordance with the present invention, these pressure differences can be set to be different. For example, the upper pressure limit Pu can be set to a value which is greater than the increased value of the main nozzle pressure which is set during normal operation of the air jet type loom 1 ( during the third insertion of weft yarn and after the subsequent insertions of weft yarn following the start of the loom 1 of the air jet type). In the present embodiment, the main nozzle pressure PT varies around the target pressure during operation of the jet loom 1 of the air jet type. In accordance with the present invention, the upper limit pressure PU need not be adjusted. Although the above description has focused on the electropneumatic regulator 9, the same applies to the electropneumatic regulator 18 which is connected to the secondary tank for the air 19 and the pressure of the secondary nozzle is regulated by the electropneumatic regulator 18 .
    According to the present embodiment of the invention, an adjustment of the lower limit pressure PL to a value lower than the insertion pressure of weft yarn at the end of the first insertion of weft yarn after the start of the loom. weave 1 of the air jet type limits to a minimum the different activations of the electromagnetic valve 28 for supplying the air and the electromagnetic valve 29 for air vibrations, electropneumatic regulators 9, 18. During of operation of the air jet type loom 1, the weft insertion pressure is adjusted by the diaphragm 30 which can move in response to a drop in the thread insertion pressure of frame at the time of insertion of the weft thread. Therefore, activation of the electromagnetic valve 28 for supplying air and the electromagnetic valve 29 for releasing air is not required. Accordingly, according to the present embodiment of the invention, the weft insertion pressure is stabilized around the target pressure PT by preventing a significant variation in the insertion pressure of frame and at the same time by the fact that it reduces the number of activations of the electromagnetic valve 28 of the air supply and the electromagnetic valve 29 of the release of air, so that we increase the service life of electropneumatic controllers 9, 18.
    The configuration of the present invention is not limited to the embodiment described above: it may be subject to various modifications within the scope of the invention. The present invention may be modified as illustrated by way of example hereinafter. (1) In accordance with the present embodiment of the invention, the lower limit pressure PL is set to the average value of the weft insertion pressure PI at the end of the first insertion of weft thread after the start. of the air jet type loom 1 and the weft insertion pressure P2 at the end of the second weft insertion. However, the lower limit pressure PL may be any value in the range between the weft insertion pressures P1 and P2. (2) The present invention is applicable to an air jet type loom having a tandem nozzle disposed upstream of the main weft nozzle 13 or the polychrome loom of the invention. air jet type having a plurality of main nozzles 13.
    权利要求:
    Claims (4)
    [1]
    An air jet type weaving machine comprising a weft insertion nozzle fed by compressed air, the loom comprising an apparatus (24) for adjusting the pressure of the compressed air to inserting the weft yarn to be fed from an air supply source (3) to the weft insertion nozzle (13, 22) via a tank for the air (10, 19). ) at a target pressure (PT) via an electropneumatic regulator (9, 18) in the air jet type loom (1), the electropneumatic regulator (9, 18) including: a pressure control unit pneumatic spring type (25) having a diaphragm (30), a primary chamber (31) formed on one side of the diaphragm (30) and a secondary chamber (32) which is formed on the other side of the diaphragm (30) the secondary chamber (32) being in communication with the air reservoir (10, 19); a pilot valve (26) which regulates the flow of compressed air flowing between the air supply source (3) and the air reservoir (10, 19) in response to the displacement of the diaphragm (30) ; an electromagnetic air supply valve (28) which adjusts the supply of compressed air from the air supply source (3) to the primary chamber (31) of the diaphragm (30) and which is controlled based on the pressure in the air reservoir (10, 19); an electromagnetic solenoid valve (29) which regulates the release of the compressed air into the primary chamber (31) to the atmosphere and which is controlled based on the pressure in the tank for the air (10, 19); and an air release valve (27) which adjusts the release of the compressed air into the secondary chamber (32) to the atmosphere in response to movement of the diaphragm (30); the apparatus 24 being characterized in that: the lower limit pressure (PI) of the pressure of the weft insertion nozzle which determines the moment corresponding to the start of activation of the electromagnetic valve (28) of the air supply is set to be less than the weft insertion pressure (PI) after a first insertion of weft thread after the start of the jet type loom (1). air.
    [2]
    A loom according to claim 1, characterized in that: the lower limit pressure (PL) is set to a value greater than the weft insertion pressure (P2) at the end of the second thread insertion. weft after the start of the loom (1) of the air jet type.
    [3]
    3. Loom according to claim 1 or 2, characterized in that: the upper limit pressure (PU) of the weft insertion pressure which determines the moment corresponding to the start of activation of the solenoid valve ( 29) is set to the sum of the target pressure (PT) and the difference enfα target pressure (PT) and the lower limit pressure (PL).
    [4]
    Apparatus for adjusting the pressure of compressed air for insertion of the weft yarn to be fed from an air supply source into an air jet type loom (1) according to any one of the preceding claims.
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    同族专利:
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    申请号 | 申请日 | 专利标题
    JP2013224127A|JP6119557B2|2013-10-29|2013-10-29|Compressed air pressure control device for air jet loom|
    JP2013224127|2013-10-29|
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