A SET TO MAKE BAGS (Machine-translation by Google Translate, not legally binding)

专利摘要:
A bag-forming assembly comprising a forming support; a controller; a belt drive controlled by the controller to feed a film at a film speed to the forming support, to form a tubular film moving in a film direction; a sealing device for sealing the tubular film in a first sealing direction, the first sealing direction being parallel to the direction of the film; a set of jaws controlled by the controller and movable at a jaw speed to contact and seal the tubular film in a second sealing direction to form a first seal and a second seal on each bag, thus forming a closed bag; a conveyor for receiving the closed bag and for transporting the closed bag to a destination; and a set of sensors operatively associated with the conveyor, to provide a volume signal to the controller. (Machine-translation by Google Translate, not legally binding)
公开号:ES2799673A1
申请号:ES202030574
申请日:2020-06-12
公开日:2020-12-18
发明作者:Brian Pearson；Andre Tombült
申请人:TNA Australia Pty Ltd；
IPC主号:

专利说明:

[0002] A set to make bags
[0004] TECHNICAL SECTOR
[0006] The present invention relates to the packaging industry, and in particular, but not exclusively, to the packaging industry employing vertical fill and form packaging machines producing snack bags.
[0008] BACKGROUND
[0010] In the packaging industry, vertical filling and forming machines are used to produce sealed bags of product. A particular example is the packaging of snacks.
[0012] The bags are formed by the packaging machine, by the packaging machine that provides the bag with a longitudinal seal and two transverse seals.
[0014] If the seals are not formed correctly, the quality of the food contained in the bag degrades. As a particular example, in the manufacture of snacks, a part of the snacks that are packaged can be located in the seal, thus degrading the quality of the seal.
[0016] In US Patents 6202476 and US 6041646 devices are described which aim to detect defective bags, in particular bags that have leaks.
[0018] It is a disadvantage of the packaging apparatus discussed above, that defective bags can be produced and not detected. However, another disadvantage is that its operation is intermittent and therefore slow.
[0020] In addition to the above, as the packaging machines produce bags, they are flushed to a lower conveyor. Bags can take a variety of configurations. This has the disadvantage of making it difficult to organize the bags in order to contain them in larger bags or boxes.
[0021] It is the object of the present invention to overcome or at least substantially improve one of the above disadvantages, or at least to provide a useful alternative to the aforementioned devices.
[0023] In a first aspect, the present invention provides an assembly for forming bags, the assembly includes:
[0025] a shaping support;
[0027] a controller;
[0029] a belt drive controlled by the controller for feeding a film at a film speed to the forming holder to form a tubular film moving in a film direction;
[0031] a sealing device for sealing the tubular film in a first sealing direction, the first sealing direction being parallel to the direction of the film;
[0033] a set of jaws controlled by the controller and movable at a jaw speed to contact and seal the tubular film in a second sealing direction to form a first seal and a second seal on each bag, thus forming a closed bag, in which :
[0035] the second sealing direction is generally perpendicular to the direction of the film, and
[0037] the first seal of each closed bag is located in the tubular film at a distance along the direction of the film from the second seal of the closed bag;
[0039] a conveyor for receiving the closed bag and for transporting the closed bag to a destination; and
[0041] a set of sensors operatively associated with the conveyor, for providing a volume signal, the volume signal being indicative of a volume of the closed bag, to the controller;
[0042] wherein the controller can adjust at least one of the speeds, either that of the film and / or that of the jaw in response to the volume signal.
[0044] Preferably, the jaw assembly includes a pair of cooperative spreader bars that are operable such that, before the jaw assembly forms the second seal of a bag to be closed, the speed of the spreader bars differs from the speed of the film in a relative speed, and in which the controller can adjust the relative speed in response to the volume signal.
[0046] Preferably, the spacer bars are movable for a spacing distance while the relative velocity is non-zero, and wherein the controller can adjust the spacing distance in response to the volume signal.
[0048] Preferably, the spacer bars are movable for a spacing time while the relative velocity is not zero, and where the controller can adjust the spacing time in response to the volume signal.
[0050] Preferably, the controller can adjust the separation time by adjusting the jaw speed and the film speed so that the relative speed does not change substantially.
[0052] Preferably, the assembly further includes a gas supply device positioned adjacent the shaper support to supply an amount of gas to the tubular bag material before the jaw assembly forms the second seal of a bag to be closed, and
[0054] in which the controller can adjust the amount of gas in response to the volume signal.
[0056] Preferably, the sensor assembly includes a first sensor, the sensor operable to detect an upper surface of the bag.
[0058] Preferably, the sensor assembly includes a second sensor, the second sensor being spaced from the first sensor in said direction of the conveyor so that the sensors are spaced along the conveyor, with both sensors operable to provide the volume signal and the first sensor being located upstream of the second sensor
[0060] and wherein each sensor detects the top surface of the bag.
[0062] In a second aspect, the present invention provides an assembly for forming bags, the assembly includes:
[0064] a shaping support;
[0066] a controller;
[0068] a belt drive controlled by the controller to feed a film at a film speed to the former to form a tubular film moving in a film / plastic direction;
[0070] a sealing device for sealing the tubular film in a first sealing direction, the first sealing direction being parallel to the direction of the film;
[0072] a set of jaws controlled by the controller and movable at a jaw speed to contact and seal the tubular film in a second sealing direction to form a first seal and a second seal on each bag, thus forming a closed bag, in which the second sealing direction is generally perpendicular to the film direction, and the first sealing of each closed bag is located on the tubular film at a distance along the film direction from the second sealing of the closed bag; the set of jaws including cooperating pairs of:
[0074] closing bars for closing the tubular film;
[0076] separator bars for moving, before the set of jaws that form the second seal of a bag to be closed, at a speed that differs from the speed of the film in a relative speed; and
[0078] sealing jaws to form the first and second seals,
[0079] wherein the closing bars, when the tubular film is closed, are separated by a first distance, and the separator bars, when moving at relative speed, are separated by a second distance,
[0081] a conveyor for receiving the closed bag and for transporting the closed bag to a destination; and
[0083] a sensor assembly operatively associated with the conveyor, for providing a volume signal, the volume signal being indicative of a volume of the closed bag, to the controller; and
[0085] where the set includes:
[0087] a first distance adjusting device to adjust the first distance and / or a second distance adjusting device to adjust the second distance,
[0089] wherein the controller may operate the first and / or second distance adjusting device in response to the volume signal.
[0091] Preferably, the assembly includes both first and second distance adjusting devices.
[0093] Preferably, the second distance setting device is operable independently of the first distance setting device.
[0095] Preferably, the first and / or second distance adjusting device include:
[0097] a rotationally asymmetric axis positioned to bear on the respective bars when the bars are at their closest separation, in which:
[0099] the axis is movable between a first position corresponding to a first magnitude of the respective distance, and a second position corresponding to a second magnitude of the respective distance.
[0101] Preferably, the shaft is rotationally asymmetric so that:
[0102] when the shaft is in the first position, a first shaft chord taken between the contact positions of the shaft with the respective bars is equal to the first magnitude, and
[0104] when the shaft is in the second position, a second shaft chord taken between the contact positions of the shaft with the respective bars is equal to the second magnitude.
[0106] Preferably, the first and second adjusting devices include:
[0108] a rotationally asymmetric shaft having a first shaft profile in a position of contact of the shaft with the closing bars and a second shaft profile in a position of contact of the shaft with the spacer bars.
[0110] Preferably, the first distance adjusting device includes a first rotationally asymmetric axis and the second distance adjusting device includes a second rotationally asymmetric axis.
[0112] Preferably, the first and / or second adjusting device includes a wedge assembly positioned to abut the respective bars when the bars are at their closest spacing, the wedge assembly having:
[0114] a first wedge; and
[0116] a second wedge,
[0118] wherein the first and second wedges are movable relative to each other in a first wedge direction to change the dimension of the wedge assembly in a second wedge direction.
[0120] Preferably, the first wedge and the second wedge abut each other and each has an adjustment profile,
[0122] wherein the fit profile includes a first slope at a first end of the wedge assembly and a second slope at a second end of the wedge assembly, such that:
[0124] When the first and second wedge are moved relative to each other in the first wedge direction to increase the dimension of the wedge assembly in the second wedge direction, the first and second wedge contact each other at the first slope and second slope of the fit profile.
[0126] Preferably, the assembly includes a compression device to contact each bag, the compression device includes:
[0128] an elastic member, and
[0130] at least one endless (rotatable) member that moves in unison with the conveyor, the endless (rotatable) member provides a mount for the elastic member so that the elastic member moves in unison with said (conveyor) span to compress each bag.
[0132] Preferably, the elastic member includes a first elastic member mounted above the leg (conveyor) and moves in unison with the conveyor in the direction of the conveyor but away from the conveyor to contact and compress each bag on the leg (conveyor), and the compression device includes other elastic members, with the other elastic members spaced apart along the endless (rotatable) member.
[0134] Preferably, the elastic member includes an elongated spring that extends generally horizontally and transversely of the (conveyor) run.
[0136] Preferably, the elongated spring is longitudinally elongated transversely with respect to the direction of the conveyor.
[0138] Preferably, said endless (rotatable) member includes a pair of endless chains, the endless chains being spaced from the elastic member extending between them.
[0140] Each of the preferred features and aspects discussed above can be used in combination with each other.
[0142] BRIEF DESCRIPTION OF THE FIGURES
[0144] The preferred forms of the present invention will now be described by way of example with reference to the accompanying drawings in which:
[0145] Figure 1 is a set for forming bags, the set is sectioned along the line 1-1 of Figure 2.
[0147] Figure 2 is a schematic elevation of the assembly of Figure 1, excluding the weighing machine, chute, former, film drive assembly, and frame.
[0149] Figure 3 is a schematic detailed sectional view of the assembly of Figure 1 along the line 1-1 of Figure 2.
[0151] Figures 4a to 4c are detailed sectional schematic views of the assembly of Figure 1 along the line 1-1 of Figure 2.
[0153] Figures 5a to 5b are schematic detailed sectional views of the assembly of Figure 1 along the line 1-1 of Figure 2.
[0155] Figure 6 is a detailed side view of a third alternative embodiment of the assembly of Figure 1.
[0157] Figures 7a and 7b are schematic plan views of a first alternative embodiment of the assembly of Figure 1.
[0159] Figures 8a and 8b are schematic plan views of a fourth alternative embodiment of the assembly of Figure 1.
[0161] Figures 9a and 9b are schematic side views of a fourth alternative embodiment of the assembly of Figure 1.
[0163] DESCRIPTION OF THE REALIZATIONS
[0165] A packaging assembly 10 is schematically shown in the accompanying drawings. Assembly 10 includes a weighing machine 11 that includes a plurality of baskets 12 and 13 into which product is delivered from above, with baskets 12 and 13 operating. to deliver product batches to a conduit 14. Conduits 14 distribute product batches to a former 15. Former 15 has a former holder 41 that receives bands of bag material, and transforms the bands of Bag material in a tubular configuration passing in a direction 16. The bands of bag material fit on the outer surface of the shaping support 41 to be configured in a tubular shape. The material of the tubular bag passes down through the upper opening 53 of the shaper support 41. Arranged generally parallel to direction 16, is a sealing device which is adapted to create a longitudinal seal in the material of the tubular bag. In the preferred embodiment, the sealing device is a heater 28. Direction 16 is generally vertically downward.
[0167] The material from the tubular bag 27 is engaged by a film drive assembly 17 that pulls the material webs past the shaping support 41, and delivers the material from the tubular bag 27 to the lower packaging machine 18.
[0169] Particularly as described in US Patent 4663917, the packaging machine 18 includes pairs of rotatably driven sealing jaws 31 that are rotatably driven along generally parallel but transversely spaced axes through repeated revolutions in the angular directions 33. Assembled with the sealing jaws 31, as described in US Patent 4663917, there are cooperating pairs of spacer bars 49 to move, before the sealing jaws 31 form a seal, at a speed that differs from the speed of the film. at a relative speed to, among other things, separate the product from the area of the tubular film 27 where the seal will be formed by the sealing jaws 31, and closing bars (see Figures 4a to 4c) to close the tubular film 27 at a location above the sealing jaws 31.
[0171] As seen in Figures 5a and 5b, the closing bars 50 are separated, when the tubular film 27 is closed by the closing bars 50, by a first distance 72. Similarly, the separator bars 49 are separated, when they move at relative speed, for a second distance 73. As seen in Figure 6, the first distance 72 is at least of a base magnitude provided by a first distance spacer 74 provided in each latch bar 50 supported on each other. The second distance is at least a base magnitude provided by a second distance spacer 75 provided on each spacer bars 49 abutting each other.
[0173] The former 15 has the former support 41 as described above, and a former base plate 49. The former support 41 is mounted on the base plate 49 to be supported by it. Also attached to the base plate 41 is a frame 50 that secures the conduit 14 to the base plate 49. Also mounted on the base plate 49 is a guard bar 55 to withstand the pressure of the heater 28.
[0175] The film drive assembly 17 includes a pair of subsets 19A, 19B, with subsets 19A, 19B located on opposite sides of the tubular bag material 27 and both engage the tubular bag material 27 to pull the material from the tubular bag. tubular bag 27 through assembly 10. Preferably, subassembly 19A is a rear subassembly and subassembly 19B is a front subassembly, with subassembly 19B engaging the tubular bag material adjacent to the longitudinally overlapping edge portions of the material of the tubular bag. In an alternative embodiment, the subsets 19A, 19B, while engaging opposite portions of the tubular bag material, engage the tubular bag material on the lateral sides of the tubular bag material, that is, the subsets 19A, 19B are both separated from the overlapping longitudinal edge portions of the tubular bag material. More particularly, the sub-assemblies 19A, 19B would be offset 90 ° about the axis 54. The axis 54 is generally a vertical central axis of the packaging machine 18 and of the former 15.
[0177] Each subassembly 19A, 19B includes a belt 20 that passes between a first idler roller (pulley) 21, a second idler roller (pulley) 22, and a drive pulley (roller) 23. The length of belt 20 that passes between the idler rollers 21 and 22 provide a drive belt portion 24 that is generally linear and parallel to direction 16. The portion 24 moves in direction 16 to move the tubular bag material in direction 16. The belt portion of Transmission 24 is substantially vertical since roller 21 is essentially vertical above roller 22.
[0179] Belt 20 passes from idler roller 22 to drive pulley (roller) 23 to provide a second belt part 25. Belt part 25 is generally horizontal, that is, generally perpendicular (transverse) to direction 16. The Belt 20 passes around pulley 23 to idler roller 21 to provide a belt portion 35. Pulley 23 is laterally spaced from portion 24.
[0181] The strap portion 24 follows a linear path generally parallel to the direction 16 and the extension direction of the tubular bag material 27. The strap portion 25 follows a generally linear path that extends away from the tubular bag material 27 (and part 24), to have an extension direction away from the portions 24. The strap part 35 has an extension direction away from the strap part 24. Preferably, the part 25 is perpendicular to the part 24.
[0183] Belt 20 passes in the direction 26 of idler rollers 21 and 22 and drive pulley 23. The two belt portions 24 are generally parallel, extending over the same surface but transversely spaced to be on opposite sides of the tubular bag material. 27.
[0185] The drive pulleys 23 are driven by a drive control and motor assembly (not shown) to provide the tubular bag material 27 with a desired speed profile (film speed). As mentioned above, the material of the tubular bag 27 is driven in the direction 16. However, in a further preferred way, the drive control and the motor assembly can vary the speed in the direction 16. The drive control The drive and motor assembly includes a computer controlled servo motor (not shown) or motors to drive pulley 23.
[0187] Each of the jaws 31 is mounted on a shaft 32 by means of jaw brackets (arms) 47, with the shafts 32 rotatably driven in opposite angular directions 33. Consequently, the sealing jaws 31 are driven via repeated revolutions in synchronism along generally parallel spaced axes, the axes being generally transverse to direction 16. The sealing jaws 31 engage the material of the tubular bag 27, transversely seal the material of the bag 27 creating a final seal 43 and cut the bag material 27 to form separate bags 40.
[0189] Shafts 32 are driven by a jaw control and motor assembly (not shown), with the jaw control and motor assembly operating so that shafts 32 have a desired angular velocity profile (jaw speed) . Preferably, the jaw motor and control assembly is operable so that jaws 31 have a peripheral velocity, when adjacent to each other, for contacting the material of the tubular bag 27, which is less than the velocity of the material of the jaw. the tubular bag 27 on the straps 24. When the jaws 31 engage with the material of the bag 27 to form a seal therein, the jaws 31 have the same speed as the material of the bag 27 between the jaws 31. Consequently , the material of the bag 27, moving with the jaws 31 when they are engaged with the material of the bag 27, changes speed.
[0191] As described in US Patent 4663917, the spreader bars 49 are connected to the shaft 32 by links (not shown) that can result in the speed profile of the spreader bars 49 differing from the speed profile of the shaft. 32 at a relative speed. However, the jaws 31, spreader bars 49, and film drive assembly 17 still function to produce a fixed number of bags 40 per minute, requiring that the revolutions per minute of the spreader bars equal the revolutions per minute. minute of jaws 31 and shaft 32.
[0193] The jaw motor and control assembly includes a computer (not shown) and / or a servo motor (not shown) or motors for axes 32, with the computer programmed to operate the servo motor or motors to produce the desired angular velocity profile. axes 32.
[0195] The drive motor and control assembly, and the jaw control and motor assembly, may share a computer (not shown) that controls the operation of the respective servo motors that drive the drive pulleys 23 and shafts 32, such that the sealing jaws 31 are coordinated with the speed of the material of the tubular bag 27. However, it should also be noted that the computer could control the respective servo motors so that the sealing jaws 31 have a peripheral speed, when they are adjacent or engaged with the material of the tubular bag 27, which is different from the speed provided to the material of the tubular bag 27 by the strap 20. For example, the jaws 31, and the material of the bag 27 that engages therewith, may have a slower speed, causing the product to settle towards the lower end of the bag, with the jaws 31 then increasing in speed when it will form the cross seal on the bag. In another embodiment, the jaws 31 may have a speed opposite to the direction of movement of the material in the tubular bag 27 when the jaws 31 are adjacent to the material 27.
[0197] In a preferred embodiment shown in Figure 1, the packaging assembly 10 also includes a gas supply device 70 mounted adjacent to the former 15 to supply an amount of gas into the material of the tubular bag 27. Preferably, the amount gas is supplied inside the bag material tubular 27 immediately before the set of sealing jaws 31 that form the second seal, or the final seal 43 of a separate bag 40 to be closed. The amount of gas is preferably an amount of inert gas, such as nitrogen, argon, or the like. The amount of gas displaces the oxygen-containing air in the separate bag 40 and thus inhibits the reaction of the contents of the separate bag 40 with oxygen, which would lead to an undesirable deterioration of the texture and taste of the contents. of the separate bag 40. The gas supply device 70 is controlled by, for example, an electronically actuated solenoid gas valve (not shown), the central computer is adapted to control the solenoid gas valve to open and close the valve solenoid at a respective predetermined time in relation to the movement of the sealing jaws 31.
[0199] Also schematically illustrated in the accompanying drawings is a conveyor assembly 30 for contacting the closed bags 40 containing the product. As a particular example, bag 40 can be a bag containing snacks. The bag 40 would have a longitudinal seal and end seals 43. Each bag 40 is intended to have a predetermined volume and is hermetically sealed.
[0201] The conveyor assembly 30 includes a conveyor 34. The conveyor 34 includes an endless belt 36 having an upper conveyor length 37 that moves in a conveying direction 38. The length 37 extends generally horizontally between a downstream end 39 and an upstream end 44, with the bags 40 transported in the direction 38 toward the downstream end 39 from where the bags 40 are delivered from the conveyor assembly 30. The bags 40 rest on the run 37, as the run 37 provides a upward facing surface.
[0203] Conveyor 34 also includes a motor / gearbox assembly 45 that drives endless belt 36 in direction 38 via drive roll 46.
[0205] The conveyor 34 includes a base 48 on which the endless (rotating) belt 36 is mounted, while a compression device 51 is also mounted on the base 48. The compression device 51 engages the bags 40 and compresses the bags 40 against section 37.
[0207] The compression device 51 includes an endless (rotatable) member 52 that includes, spaced apart, two parallel endless chains 55 that support, and between which extend, a plurality of springs (elastic members) 56. Springs 56 extend generally horizontally and transversely to span 37.
[0209] The endless chains 55 are driven in a direction 57 so that a length 58 of the endless (rotating) member 52 moves in the conveying direction 38 at the same speed as the length 37, so that the lengths 58 and 37 they move in unison.
[0211] The endless chains 55 pass around a free wheel assembly 59, as well as a transmission sprocket assembly 60. The transmission sprocket assembly 60 includes a motor (not shown) that is coordinated with motor 45 so that legs 37 and 58 move in unison in the direction of transport 38.
[0213] Mounted and / or operatively associated with device 51 are first and second sensors 62a, 62b that form a set of sensors 63 with first sensor 62a spaced from second sensor 62b in direction 38 toward downstream end 39. Each of The sensors 62a, 62b detect an upper surface 40A of the bag 40, to provide a signal that is an indication of the depth of the bag 40 and therefore the volume of the bag 40. Thus, the assembly of sensors 63 provide a volume signal. However, device 51 also works with only one of sensors 62a, 62b, each sensor 62a, 62b being capable of providing the volume signal.
[0215] As bags 40 pass in direction 38, they are compressed by springs 56. Consequently, if there is a leak in bags 40, the volume of bag 40 will decrease, so that when sensor 62b detects the upper surface 40A from bag 40, a volume signal indicating a reduced volume compared to the volume indicated by the volume signal provided by sensor 62a will be indicative of a leaking bag 40, being a defective bag.
[0217] As the bags 40 are compressed, the springs 56 are elastically deformed upward and return to their home position when not engaged with a bag 40.
[0219] Sensor assembly 63 communicates with a central computer or controller (not shown), to identify defective bags 40 and remove them from the process.
[0220] Furthermore, the sensor assembly 63 is adapted to provide the volume signal to the central computer to compare the volume signal with a predetermined target volume range. The central computer is adapted to adjust, by providing a control input for the drive and motor control assembly, and the jaw and motor control assembly, at least one of the speeds, be it that of the film and / or that of the jaw in response to the volume signal.
[0222] Adjusting the film speed, which is the desired speed profile of the tubular bag material 27, and the jaw speed, which is the desired speed profile of the jaws 31, allows the central computer to adjust the length and time of separation. The separation is the action of the separator bars 49 that are joined in compressive contact with the material of the tubular bag 27, as shown in Figures 4a to 4c, to separate the product from the material portions of the tubular bag 27 that they will be used to create the final seal 43. It will be appreciated that to effect separation, the separator bars 49 require a speed relative to the material of the tubular bag 27.
[0224] The separation length is the length of the material of the tubular bag 27 through which the separator bars 49 move during the separation, that is, while the separator bars 49 are in contact with the material of the tubular bag 27. The length separation is shown in Figures 4a and 4b. The increment between a first distance 68 in Figure 4a and a second distance 69 in Figure 4b is the pitch length. The separation time is the time taken for the separator bars 49 to travel the separation length.
[0226] The volume of air in bag 40 is affected by the length of separation and time of separation. For example, a larger gap length would result in a greater volume of air in bag 40, compared to a smaller gap length, as air is forced into bag 40. Similarly, a longer separation time will result in a smaller volume of air in bag 40, compared to a shorter separation time, as air is allowed to escape from bag 40 during the separation movement before it is seal the bag. The central computer adjusts the gap length by setting a relative speed between the jaw speed and the film speed. The relative speed can be adjusted by increasing or decreasing the speed of the film and / or the speed of the jaw.
[0227] A high relative velocity between the jaw speed and the film speed results in the spacer bars 49 traveling a greater spacing length in the tubular bag material 27 before moving away from the tubular bag material 27. Similarly, when the jaw speed and the film speed are very similar, and the relative speed is low there, the spacer bars 49 travel a shorter spacing length in the tubular bag material 27 before moving away of the tubular bag material.
[0229] The central computer adjusts the separation time by increasing or decreasing the speed of the jaw. If no effect on gap length is required, the central computer simultaneously increases or decreases the speed of the film to ensure that the relative speed does not change. An increase in the speed of the jaw causes the stripper bars 49 to traverse the gap length more quickly.
[0231] Therefore, by adjusting at least one of the speeds, be it that of the film and / or that of the jaw in response to the volume signal, the central computer adapts to adjust the volume of air in rear bags 40 in response to the volume signal from at least one of the sensors 62a, 62b indicating that the volume of air in the bags 40 detected by the sensors 62a, 62b does not fall within the predetermined target volume range.
[0233] The central computer can also adjust the amount of gas delivered by the gas supply device 70 in response to the volume signal. For example, in response to a volume signal indicating that the volume of air in the bags 40 is below the target volume range, the central computer may increase the amount of gas delivered by the gas delivery device 70, increasing thus the volume of air in the bags 40 when the final seal 43 is formed by the sealing jaws 31. Similarly, the central computer can decrease the amount of gas supplied by the gas supply device 70, if the signal of Volume indicates that the volume of air in the bags 40 is above the target volume range. The central computer can adjust the amount of gas supplied by the gas supply device 70 by opening the solenoid gas valve at an earlier or later time in relation to the movement of the jaws 31 at the predetermined time to increase the period of time that the solenoid valve is open.
[0235] Additionally, or alternatively, the packaging machine 18 may include a first distance adjusting device 76 for adjusting the first distance 72 from a first magnitude to a second magnitude. Additionally, or alternatively, the packaging machine 18 may include a second distance adjusting device 77 for adjusting the second distance 73 from a first magnitude to a second magnitude.
[0237] Two embodiments of the distance adjusting devices 76, 77 will now be discussed, with reference to the first distance adjusting device 76 associated with the closure bars 50. However, it will be appreciated that either embodiment could also be applied as the second adjusting device. distance adjustment 77 associated with spreader bars 49.
[0239] In a first embodiment, the first adjustment device 76 includes a positioned shaft 76 that abuts on the first spacers 74. The shaft 76 is rotationally asymmetric such that, when the shaft 76 is in a first position shown in Figure 7a , a first shaft chord 76 taken between the shaft contact positions with the closure bars 50 is equal to the first magnitude, such that the closure bars 50 are now separated by the first quantity at the first distance 72.
[0241] As seen in Figure 7b, when the shaft 76 is rotated, it is in a second position and a second chord of the shaft taken between the contact positions of the shaft with the closing bars 50 is equal to the second magnitude. The axis 76 causes the first spacers 74, and therefore the closest bars 50, to separate, causing the magnitude of the first distance 76 to change to the second magnitude.
[0243] In a second embodiment, the packaging machine 18 includes both the first and the second adjusting devices 76, 77, therefore it has two independent axes 76, 77 to control the first and the second distance 72, 73. Hence , the second distance setting device 77 is operable independently of the first distance setting device 76.
[0245] In a third embodiment, as seen in figure 6, the first and second distance adjusting device 76, 77, are realized as a single axis 76 having a first rotationally asymmetric profile 83 in a contact position of axis 76 with the closing bars 50, and a second shaft profile 84 in a position of contact of the shaft 76 with the spacer bars 49.
[0246] In a fourth embodiment, as seen in Figure 8a, the first adjustment device 76 includes a wedge assembly 76 positioned to abut the closure bars 50 when the closure bars 50 are at their closest spacing. The wedge assembly 76 includes a first wedge 78 and a second wedge 79. The first and second wedges 78, 79 are movable relative to each other in a first wedge direction 85 from a first position, as seen in Figure 9a, to a second position, as seen in Figure 9b, to change the dimension of the wedge assembly 76 in a second wedge direction, the second wedge direction being parallel to the first distance 72.
[0248] Each of the wedges has an adjustment profile. The adjustment profile 80 has a first slope 81 at a first end of wedge assembly 76 and a second slope 82 at a second end of wedge assembly 76. When the first and second wedges 78, 79 move relative to each other. the other in the direction of the first wedge 85 to increase the first distance 72, the first and second wedges 78, 79 are brought into contact at the first slope 81 and the second slope 82 of the adjustment profile.
[0250] The central computer may adjust, in the embodiments discussed above and in response to the volume signal, the first distance 72 and / or the second distance 73 using the first and second distance adjusting devices 76, 77 respectively, for example by controlling an electric motor (not shown) to drive devices 76, 77. For example, in response to a volume signal indicating that the volume of air in bags 40 is below the target volume range, the central computer can operate the first and / or second distance adjusting device 76, 77 to decrease the first and / or second distance 72, 73, causing air to form in the bag 40 to escape more slowly before the final seal 43 is formed. Therefore, the volume of air in the bags 40 is increased when the final seal 43 is formed by the sealing jaws 31. Similarly, in response to a volume signal indicating that the volume of air in bags 40 is above the target volume range, the central computer can operate the first and / or second distance adjusting device 76, 77, to increase the first and / or second distance 72, 73, causing the air in the bag 40 to be formed leaks out more quickly before the final seal 43 is formed. Therefore, the volume of air in the bags 40 when the final closure 43 is formed by the sealing jaws 31 decreases.
[0252] Compression device 51 is adjustable with respect to span 37 by a "parallelogram" arrangement that includes a pair of generally parallel links 64.
[0253] Each of the links 64 is pivotally attached to the device 51, and pivotally attached to the base 48, so that the span 58 remains generally parallel to the span 37.
[0255] Links 64 are attached to drive shafts 65 that move angularly about their longitudinal axes by a drive device, including a shift lever 86 for moving drive shafts 65 angularly about their longitudinal axes. The transmission device 66 includes an electric motor, for example, the linear actuator 71, and the gearbox assembly, which comprises a screw drive, and would function to ensure that the section 58 is at a correct distance from the section 37 to match the size of the 40 bags being transported.
[0256] REFERENCE NUMERALS:
[0258] 10 packaging set
[0259] 11 weighing machine
[0260] 12 baskets
[0261] 13 baskets
[0262] 14 duct
[0263] 15 shaper
[0264] 16 direction
[0265] 17 film drive assembly 18 packaging machine
[0266] 19A subset
[0267] 19B subset
[0268] 20 strap
[0269] 21 first crazy roller
[0270] 22 second idler roller
[0271] 23 driving pulley
[0272] 24 part belt drive
[0273] 25 part strap
[0274] 26 address
[0275] 27 tubular bag material
[0276] 28 sealing device
[0277] 30 conveyor set
[0278] 31 sealing jaws
[0279] 32 axes
[0280] 33 angular directions
[0281] 34 transporter
[0282] 35 part strap
[0283] 36 endless belt
[0284] 37 upper conveyor section
[0285] 38 transport direction
[0286] 39 downstream end
[0287] 40 separate bags
[0288] 40A top surface
[0289] 41 shaper support
[0290] 43 final sealing
[0291] upstream end
[0292] drive roller motor / gearbox assembly
[0293] jaw brackets
[0294] base
[0295] spreader bars
[0296] closing bars
[0297] compression device
[0298] endless member (rotating)
[0299] top opening
[0300] axles
[0301] endless chains
[0302] elastic members
[0303] direction
[0304] stretch
[0305] free sprocket assembly transmission sprocket assembly first sensor
[0306] second sensor
[0307] parallel links
[0308] transmission shafts
[0309] transmission device
[0310] first distance
[0311] second distance
[0312] gas supply device
[0313] electric motor
[0314] first distance
[0315] second distance
[0316] first distance spacer
[0317] second distance spacer first distance adjusting device second distance adjusting device first wedge
[0318] second wedge
[0319] fit profile
[0320] first slope
[0321] second slope first profile second profile

权利要求:
Claims (17)
[1]
1. A set for making bags, the set includes:
a shaping support;
a controller
a belt drive controlled by the controller for feeding a film at a film speed to the forming holder to form a tubular film moving in a film direction;
a sealing device for sealing the tubular film in a first sealing direction, the first sealing direction being parallel to the direction of the film;
a set of jaws controlled by the controller and movable at a jaw speed to contact and seal the tubular film in a second sealing direction to form a first seal and a second seal on each bag, thus forming a closed bag, in which :
the second sealing direction is generally perpendicular to the direction of the film, and
the first seal of each closed bag is located in the tubular film at a distance along the direction of the film from the second seal of the closed bag;
a conveyor for receiving the closed bag and for transporting the closed bag to a destination; and
a sensor assembly operatively associated with the conveyor, for providing a volume signal, the volume signal being indicative of a volume of the closed bag, to the controller;
wherein the controller can adjust at least one of the speeds, either the film speed and / or the jaw speed, in response to the volume signal.
[2]
The assembly of claim 1, wherein the jaw assembly includes a pair of cooperating spreader bars that are operable such that, before the jaw assembly forms the second seal of a bag to be closed, the velocity of the separator bars differs from film speed by a relative speed, and where the controller can adjust the relative speed in response to the volume signal.
[3]
The assembly of claim 2, wherein the spacer bars are movable for a spacing distance while the relative velocity is not zero, and wherein the controller can adjust the spacing distance in response to the volume signal. .
[4]
The assembly of claim 2 or 3, wherein the spacer bars are movable for a spacing time while the relative velocity is not zero, and wherein the controller can adjust the spacing time in response to the signal. of volume.
[5]
The assembly of claim 4, wherein the controller may adjust the separation time by adjusting the jaw speed and the film speed so that the relative speed does not change substantially.
[6]
The assembly of any one of claims 1 to 5, wherein the assembly further includes a gas supply device positioned adjacent to the shaping support to supply an amount of gas into the material of the tubular bag prior to the assembly of jaws that form the second seal of a bag to be closed, and
in which the controller can adjust the amount of gas in response to the volume signal.
[7]
The assembly of any one of the preceding claims, wherein the sensor assembly includes a first sensor, a sensor operative to detect an upper surface of the bag.
[8]
The assembly of claim 7, wherein the sensor assembly includes a second sensor, the second sensor being spaced from the first sensor in said direction of the conveyor so that the sensors are spaced along the conveyor, with both sensors operational to provide the volume signal and the first sensor being upstream of the second sensor,
and wherein each sensor detects the top surface of the bag.
[9]
9. A set for forming bags, the set includes:
a shaping support;
a controller;
a belt drive controlled by the controller for feeding a film at a film speed to the forming holder to form a tubular film moving in a film direction;
a sealing device for sealing the tubular film in a first sealing direction, the first sealing direction being parallel to the direction of the film;
a set of jaws controlled by the controller and movable at a jaw speed to engage and seal the tubular film in a second sealing direction to form a first seal and a second seal on each bag, thus forming a closed bag, in which the second sealing direction is generally perpendicular to the direction of the film, and the first seal of each closed bag is located in the tubular film at a distance along the direction of the film from the second seal of the closed bag;
the set of jaws that include cooperating pairs of:
closing bars for closing the tubular film;
separator bars for moving, before the set of jaws that form the second seal of a bag to be closed, at a speed that differs from the speed of the film in a relative speed; and
sealing jaws to form the first and second seal,
wherein the closing bars, when the tubular film is closed, are separated by a first distance, and the separator bars, when moving at relative speed, are separated by a second distance,
a conveyor for receiving the closed bag and for transporting the closed bag to a destination; and
a sensor assembly operatively associated with the conveyor, for providing a volume signal, the volume signal being indicative of a volume of the closed bag, to the controller; and
in which the set includes:
a first distance adjusting device to adjust the first distance and / or a second distance adjusting device to adjust the second distance,
wherein the controller can operate the first and / or second distance adjusting device in response to the volume signal.
[10]
The assembly of claim 9, wherein the assembly includes first and second distance adjusting devices.
[11]
The assembly of claim 9 or 10, wherein the second distance setting device is operable independently of the first distance setting device.
[12]
12. The set of any one of claims 9 to 11, wherein the first and / or second distance adjusting device includes:
a rotationally asymmetric axis positioned to bear on the respective bars when the bars are at their closest separation, where:
the axis is movable between a first position corresponding to a first magnitude of the respective distance, and a second position corresponding to a second magnitude of the respective distance.
[13]
The assembly of claim 12, wherein the shaft is rotationally asymmetric such that:
when the axle is in the first position, a first axle chord taken between the contact positions of the shaft with the respective bars is equal to the first magnitude, and
when the shaft is in the second position, a second shaft chord taken between the contact positions of the shaft with the respective bars is equal to the second magnitude.
[14]
The set of claim, wherein the first and second adjusting devices include:
a rotationally asymmetric shaft having a first shaft profile in a position of contact of the shaft with the closing bars and a second shaft profile in a position of contact of the shaft with the spacer bars.
[15]
The assembly of any one of claims 12 to 14, wherein the first distance adjusting device includes a first rotationally asymmetric axis and the second distance adjusting device includes a second rotationally asymmetric axis.
[16]
16. The assembly of any one of claims 9 to 15, wherein the first and / or second adjusting device includes a wedge assembly positioned to abut the respective bars when the bars are at their closest spacing, the assembly having wedge:
a first wedge; and
a second wedge;
wherein the first and second wedges are movable relative to each other in a first wedge direction to change the dimension of the wedge assembly in a second wedge direction.
[17]
17. The assembly of claim 16, wherein the first wedge and the second wedge abut each other and have an adjustment profile,
wherein the fit profile includes a first slope at a first end of the wedge assembly and a second slope at a second end of the wedge assembly, such that:
when the first and second wedges move relative to each other in the first wedge direction to increase the dimension of the wedge assembly in the second wedge direction, the first and the second wedge contact each other at the first slope and the second slope of the fit profile.

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同族专利:

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公开号 | 公开日

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JP2020203728A|2020-12-24|

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DE102020115585A1|2020-12-17|

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AU2020203986A1|2021-01-07|

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GB202008851D0|2020-07-29|

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GB2586335A|2021-02-17|

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BR102020011891A2|2021-02-23|

---

US20200391895A1|2020-12-17|

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US10988275B2|2017-05-19|2021-04-27|Cryovac, Llc|Package feedback control system and associated methods|CN111559543A|2019-02-13|2020-08-21|株式会社石田|Metering and packaging system|

法律状态:
2020-12-18| BA2A| Patent application published|Ref document number: 2799673 Country of ref document: ES Kind code of ref document: A1 Effective date: 20201218 |

优先权:

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申请号 | 申请日 | 专利标题

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AU2019902066A|AU2019902066A0|2019-06-13|An assembly for forming bags|

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