JP2018076090A - Heat seal bar driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a large load from being applied to a drive motor during a non-movement operation of a heat seal bar.SOLUTION: A heat seal bar driving device includes: a first holding part 14 for holding a first heat seal bar 16; a second holding part 13 for holding a second heat seal bar 15; a movement part 10 for reciprocating between a top dead center and a bottom dead center; a first collar 31 provided at the movement part 10, and for supporting the second holding part 13; a second collar 32 provided at the movement part 10; an intermediate collar 17 provided at the movement part 10, and provided between the first collar 31 and the second collar 32; a pressing coil spring 22 provided between the second collar 32 and the intermediate collar 17, for pressing the second heat seal bar 15; a first stopper 41 provided in/separated from a first space C1 between the first holding part 14 and the second holding part 13; and a second stopper 42 provided in/separated from a second space C2 between the second holding part 13 and the intermediate collar 17.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heat seal bar driving device that moves a heat seal bar provided in a bag making machine.

  As in Patent Document 1, the bag making machine superimposes two continuous body members in the vertical direction and intermittently feeds them at a constant feed pitch in the feed direction (length direction). The bag making machine includes a vertical heater that heat-seals the body in the feeding direction, and a horizontal heater that heat-seals the body in the horizontal width direction perpendicular to the feeding direction. The bag making machine heat-seals the barrel with a vertical heater and a horizontal heater each time the barrel is sent intermittently, and cross-cuts with a cutter. Thereby, a plastic bag is completed.

  The bag making machine includes a heat seal bar driving device that moves the heat seal bar of the horizontal heater. The heat seal bar driving device moves the heat seal bar toward the body at a predetermined timing and performs heat seal. When manufacturing a bag having the same size as the feed pitch, the heat seal bar driving device moves and heat seals the heat seal bar of the horizontal heater every time the body material is intermittently fed at the feed pitch.

  On the other hand, when manufacturing a bag (long bag) longer than the feed pitch, the heat seal bar driving device does not move the heat seal bar of the horizontal heater every time the body material is intermittently fed at the feed pitch. This is because every time the body is intermittently fed at a feed pitch, if the body is heat sealed with a horizontal heater, not only the outer end of the bag but also the center of the bag is heat sealed.

  Therefore, in this case, the heat seal bar drive device moves the heat seal bar of the horizontal heater every time the body material is intermittently sent at a feed pitch (heat seal operation), and heat seal of the horizontal heater. It is necessary to selectively perform a non-moving operation (non-heat sealing operation) that does not move the bar.

  FIG. 7 shows a conventional horizontal heater. As shown in FIG. 7, the horizontal heater includes a second heat seal bar 15 and a first heat seal bar 16 extending in the width direction Y. The body materials 1 and 2 are sent between the first and second heat seal bars 16 and 15, and the body materials 1 and 2 are sandwiched between the first and second heat seal bars 16 and 15 and heat sealed.

  The horizontal heater includes a first holding portion 14 that extends in the width direction Y. The first holding unit 14 holds the first heat seal bar 16 and is configured to be movable in the feeding direction X (FIGS. 1 and 2) according to the bag size so that it does not descend when the heat seal operation is performed. It is fixed to the frame (not shown) of the bag making machine.

  The horizontal heater includes a heat seal bar driving device 101 that moves the second heat seal bar 15. The conventional heat seal bar driving apparatus 101 includes a moving unit 100 that moves in the vertical direction Z. The moving unit 100 includes a pair of first moving poles 11 extending in the up-and-down direction Z, a pair of second moving poles 12 extending in the up-and-down direction Z and connected to the first moving pole 11, . The first and second moving poles 11 and 12 are connected to the same shaft. Therefore, the first and second moving poles 11 and 12 are integrated. The first moving poles 11 and the second moving poles 12 are arranged at intervals in the width direction Y.

  The heat seal bar drive device 101 includes a drive motor 26 connected to the first moving pole 11 via a crank mechanism (two-dot chain line). Each time the body materials 1 and 2 are intermittently fed at a feed pitch, the drive motor 26 rotates once. With one rotation of the drive motor 26, the moving unit 100 reciprocates once in the vertical direction Z between the top dead center and the bottom dead center through the crank mechanism.

  The heat seal bar drive device 101 includes a second holding unit 13 extending in the width direction Y. The second holding unit 13 holds the second heat seal bar 15. The first moving pole 11 passes through a pair of through holes 14 a provided in the first holding part 14. The second moving pole 12 passes through a pair of through holes 13 a provided in the second holding portion 13.

  The first moving pole 11 includes a nut-type first collar 31 screwed into the upper end thereof. The first collar 31 protrudes from the peripheral surface of the first moving pole 11. The second holding unit 13 is placed and supported on the first collar 31. When the first collar 31 is rotated forward and backward with respect to the first moving pole 11, the position of the first collar 31 in the vertical direction Z can be adjusted.

  The second moving pole 12 includes a nut-type second collar 32 screwed into the upper end thereof. The second collar 32 protrudes from the peripheral surface of the second moving pole 12. When the second collar 32 rotates forward and backward with respect to the second moving pole 12, the position of the second collar 32 in the vertical direction Z can be adjusted.

  The heat seal bar drive device 101 includes an auxiliary coil spring 21 inserted through the first moving pole 11 and a pressure coil spring 22 inserted through the second moving pole 12. The first and pressure coil springs 21 and 22 are compression coil springs.

  Both ends of the auxiliary coil spring 21 are sandwiched between the first holding portion 14 and the first collar 31. Therefore, the biasing force of the auxiliary coil spring 21 can be adjusted by the position of the first collar 31. Both ends of the pressure coil spring 22 are sandwiched between the second holding part 13 and the second collar 32. Therefore, the urging force of the pressure coil spring 22 can be adjusted by the position of the second collar 32.

  The auxiliary coil spring 21 is provided to assist the drive motor 26 when the second heat seal bar 15 is raised to prevent buckling of the crank mechanism, and has a weak biasing force. Therefore, the auxiliary coil spring 21 can be omitted. On the other hand, the pressurizing coil spring 22 has a strong biasing force for pressurizing the second heat seal bar 15 toward the first heat seal bar 16 as described later.

  The 1st holding | maintenance part 14 is provided with a pair of projection part 40 which protrudes upwards in the both sides. The heat seal bar drive device 101 includes a pair of stoppers 41 that can advance and retract in the width direction Y in the space C5 between the protrusion 40 and the second holding unit 13. The stopper 41 is advanced and retracted by an actuator 61 such as an air cylinder.

  When the moving unit 100 is disposed at the top dead center, a space C5 is generated between the protrusion 40 and the second holding unit 13. The height in the vertical direction Z of the stopper 41 is substantially the same as the height in the vertical direction Z of the space C5.

[Movement operation (heat seal operation)]
A moving operation (heat sealing operation) in which the second heat seal bar 15 approaches the first heat seal bar 16 will be described.
When the body materials 1 and 2 are heat sealed with the first and second heat seal bars 16 and 15, the stopper 41 is disposed away from the space C5. Due to the rotation of the drive motor 26, the moving unit 100 descends from the top dead center. Thereby, as shown in FIG. 8, the second heat seal bar 15 comes into contact with the body materials 1 and 2 on the second heat seal bar 15 (heat seal start point).

  Thereafter, as illustrated in FIG. 9, when the moving unit 100 further descends and reaches the bottom dead center, a space C <b> 6 is generated between the second holding unit 13 and the first collar 31. While the space C <b> 6 is generated, the pressure coil spring 22 pressurizes the second holding portion 13, and the second heat seal bar 15 strongly heat seals the body materials 1 and 2. The moving amount of the moving unit 100 from the heat seal start point to the bottom dead center is referred to as “smart”. The amount of movement “siki” is not large (about 1 mm).

[Non-moving operation (non-heat sealing operation)]
A non-moving operation (non-heat sealing operation) in which the second heat seal bar 15 does not approach the first heat seal bar 16 will be described.
As shown in FIG. 10, when the body materials 1 and 2 are not heat sealed with the first and second heat seal bars 16 and 15, the stopper 41 is disposed in the space C5. Due to the rotation of the drive motor 26, the moving unit 100 descends from the top dead center.

  Although the moving part 100 is lowered, the second holding part 13 is not lowered by the stopper 41. Accordingly, the second holding portion 13 does not descend and the second collar 32 descends, so that a space C7 is formed between the second holding portion 13 and the first collar 31, and the pressure coil spring 22 is greatly compressed. The

  Therefore, if the pressure coil spring 22 when the moving unit 100 is at the top dead center is used as a reference, the pressure coil spring 22 is further compressed by a small amount (smooth) in the moving operation, but is not moved. Then, the pressurizing coil spring 22 is further compressed by a large amount (approximately equal to the distance between the top dead center and the bottom dead center of the moving unit 100). Therefore, as described above, the pressurizing coil spring 22 has a strong biasing force, so that a large load is applied to the drive motor 26.

JP 2006-27765 A

  Therefore, in view of the above circumstances, the problem to be solved by the present invention is a heat seal configured so that a large load is not applied to the drive motor during the non-moving operation (non-heat sealing operation) of the heat seal bar. The object is to provide a bar drive.

In order to solve the above problems, a heat seal bar driving device according to the present invention is:
In a heat seal bar driving device that is provided in a bag making machine that heat seals at least two body members with a first heat seal bar and a second heat seal bar, and that closes and separates the second heat seal bar from the first heat seal bar,
A first holding part for holding the first heat seal bar;
A second holding part for holding the second heat seal bar;
A moving part that reciprocates between top dead center and bottom dead center;
A first collar which is provided in the moving part and supports the second holding part;
A second collar provided in the moving part;
An intermediate color that is provided in the moving part and disposed between the first color and the second color;
A pressure coil spring disposed between the second collar and the intermediate collar and pressurizing the second heat seal bar;
A first stopper disposed and separated in a first space between the first holding part and the second holding part;
A second stopper disposed and separated in a second space between the second holding portion and the intermediate collar,
When the second heat seal bar is close to the first heat seal bar,
The first stopper is spaced from the first space, while the second stopper is disposed in the second space,
When the second heat seal bar is not close to the first heat seal bar,
The first stopper is disposed in the first space, while the second stopper is separated from the second space.

Preferably,
Furthermore, it is provided with a regulating part that regulates the intermediate color while being provided in the moving part,
The restricting portion restricts the intermediate collar from moving toward the second support portion, but does not restrict the intermediate collar from moving toward the coil spring.

Preferably,
The regulation part consists of an upper small diameter part and a lower large diameter part,
The intermediate collar is inserted into the upper small diameter portion and supported by the lower large diameter portion.

Preferably,
The moving part
A pair of first moving poles and a pair of second moving poles arranged at intervals in the width direction;
Each first moving pole and each second moving pole are connected to the same axis in the vertical direction.

Preferably,
The first collar is provided on the first moving pole,
The second collar and the intermediate collar are provided on the second moving pole.

Preferably,
The second stopper includes a recess that can be fitted to the second moving pole.

  The heat seal bar drive device according to the present invention can prevent a large load from being applied to the drive motor during the non-moving operation (non-heat sealing operation).

The side view which shows a bag making machine. The perspective view explaining operation | movement of a bag making machine. The heat seal bar drive device concerning the present invention is shown, (A) is a front view and (B) is a top view. The front view which shows a part of heat seal bar drive device at the time of movement operation. The front view which shows a part of heat seal bar drive device following FIG. The front view which shows a part of heat seal bar drive device at the time of non-moving operation. The front view which shows the conventional heat seal bar drive device. The front view which shows a part of conventional heat seal bar drive device at the time of movement operation. The front view which shows a part of conventional heat seal bar drive device following FIG. The front view which shows a part of conventional heat seal bar drive device at the time of non-moving operation.

  Hereinafter, an embodiment of a heat seal bar driving device according to the present invention will be described based on the drawings. The feed direction (length direction) X, the width direction Y, and the vertical direction Z are orthogonal to each other.

[Bag making machine]
As shown in FIG. 1, the bag making machine superimposes two continuous body members 1 and 2 in the vertical direction Z and intermittently feeds them in the feed direction (length direction) X at a constant feed pitch P. The bag making machine includes feed rollers 30 and 31 for feeding the body materials 1 and 2 at a feed pitch P, and a tension roller 32 for maintaining a constant tension of the body materials 1 and 2 to be fed.

  The bag making machine includes a vertical heater 4 for heat-sealing the bodies 1 and 2 in the feed direction X, and first to first heat-seal the bodies 1 and 2 in a horizontal width direction Y perpendicular to the feed direction X. 4 horizontal heaters 51, 52, 53, 54. The horizontal heaters 51, 52, 53, 54 are arranged in the feed direction X at intervals of the feed pitch P.

The operation of the bag making machine when manufacturing a bag having a length 2P that is twice the feed pitch P will be described with reference to FIG.
The body materials 1 and 2 are sent to the horizontal heaters 51, 52, 53 and 54. The body materials 1 and 2 to be fed are provided with a longitudinal seal region 400 that is continuously heat-sealed along the feed direction X by the longitudinal heater 4.

  The horizontal heaters 51, 52, 53, and 54 each perform heat sealing (moving operation) and non-heat sealing (non-moving operation) each time the body materials 1 and 2 are intermittently sent at the feed pitch P. Selectively.

  As shown in FIG. 2 (A), while the fed barrels 1 and 2 are stopped, the second and fourth horizontal heaters 52 and 54 heat-seal the barrels 1 and 2, while the first and third The horizontal heaters 51 and 53 do not heat seal the body materials 1 and 2. The cutter 3 does not cross-cut the body materials 1 and 2.

  FIG. 2 (B) shows the barrels 1 and 2 fed by the feed pitch P from FIG. 2 (A). As shown in FIG. 2B, while the fed body materials 1 and 2 are stopped, the first and third horizontal heaters 51 and 53 heat-seal the body materials 1 and 2 while the second and fourth materials. The horizontal heaters 52 and 54 do not heat-seal the body materials 1 and 2. Then, the cutter 3 cross-cuts the body materials 1 and 2.

  As described above, the bag making machine heat-seal the body materials 1 and 2 with the horizontal heaters 51, 52, 53, and 54, and cross-cut with the cutter 3 for every length 2P that is twice the feed pitch P. Therefore, the body materials 1 and 2 to be fed are provided with a horizontal seal region 500 heat-sealed along the width direction Y by the horizontal heaters 51, 52, 53 and 54, and the horizontal seal region 500 is cross-cut by the cutter 3. . As a result, a bag having a length 2P that is twice the feed pitch P is completed.

[Heat seal bar drive]
As shown in FIG. 3, the horizontal heaters 51, 52, 53, 54 include a second heat seal bar 15 and a first heat seal bar 16 that extend in the width direction Y. The body materials 1 and 2 are sent between the first and second heat seal bars 16 and 15, and the body materials 1 and 2 are sandwiched between the first and second heat seal bars 16 and 15 and heat sealed.

  The horizontal heaters 51, 52, 53, 54 include a first holding part 14 that extends in the width direction Y. The first holding unit 14 holds the first heat seal bar 16 and is configured to be movable in the feeding direction X (FIGS. 1 and 2) according to the bag size so that it does not descend when the heat seal operation is performed. It is fixed to the frame (not shown) of the bag making machine.

  The horizontal heaters 51, 52, 53, 54 include a heat seal bar driving device 60 that moves the second heat seal bar 15. The heat seal bar driving device 60 includes a moving unit 10 that moves in the vertical direction Z. The moving unit 10 is disposed at a predetermined interval in the width direction Y, and is a pair of first moving poles 11 extending in the up-down direction Z, and extending in the up-down direction Z, and the first moving poles 11 and a pair of second moving poles 12 connected to each other. The first and second moving poles 11 and 12 are connected to the same shaft. Therefore, the first and second moving poles 11 and 12 are integrated. The first moving poles 11 and the second moving poles 12 are arranged at intervals in the width direction Y.

  The heat seal bar drive device 60 includes a drive motor 26 connected to the first moving pole 11 via a crank mechanism (two-dot chain line). In the present embodiment, a moving unit 10 is provided for each of the horizontal heaters 51, 52, 53, and 54, and each moving unit 10 is connected to the drive motor 26 via a crank mechanism.

  Each time the body materials 1 and 2 are intermittently fed at the feed pitch P, the drive motor 26 rotates once. By one rotation of the drive motor 26, the moving unit 10 reciprocates once in the vertical direction Z between the top dead center and the bottom dead center through the crank mechanism.

  The heat seal bar drive device 60 includes a second holding unit 13 that extends in the width direction Y. The second holding unit 13 holds the second heat seal bar 15. The first moving pole 11 passes through a pair of through holes 14 a provided in the first holding part 14. The second moving pole 12 passes through a pair of through holes 13 a provided in the first holding portion 13.

  The first moving pole 11 includes a nut-type first collar 31 screwed into the upper end thereof. The first collar 31 protrudes from the peripheral surface of the first moving pole 11. The second holding unit 13 is placed and supported on the first collar 31. When the first collar 31 is rotated forward and backward with respect to the first moving pole 11, the position of the first collar 31 in the vertical direction Z can be adjusted.

  The second moving pole 12 includes a nut-type second collar 32 screwed into the upper end thereof. The second collar 32 protrudes from the peripheral surface of the second moving pole 12. When the second collar 32 rotates forward and backward with respect to the second moving pole 12, the position of the second collar 32 in the vertical direction Z can be adjusted.

  The second moving pole 12 includes an intermediate collar 17. The intermediate collar 17 is inserted into the second moving pole 12 and protrudes from the peripheral surface of the second moving pole 12. The intermediate collar 17 is arranged at a predetermined interval in the vertical direction Z from the second holding portion 13.

  The second moving pole 12 includes a restricting portion 18 for restricting the movement of the intermediate collar 17. The restricting portion 18 is composed of a step portion constituted by an upper small diameter portion 18 a and a lower large diameter portion 18 b provided on the second moving pole 12. The intermediate collar 17 is inserted into the upper small-diameter portion 18a and is placed and supported on the lower large-diameter portion 18b. Therefore, the movement of the intermediate collar 17 in the downward direction is restricted by the restriction unit 18, but the movement in the upward direction is not restricted.

  The heat seal bar driving device 60 includes an auxiliary coil spring 21 inserted through the first moving pole 11 and a pressure coil spring 22 inserted through the second moving pole 12. The coil springs 21 and 22 are compression coil springs.

  Both ends of the auxiliary coil spring 21 are sandwiched between the first holding portion 14 and the first collar 31. Therefore, the biasing force of the auxiliary coil spring 21 can be adjusted by the position of the first collar 31. Both ends of the pressure coil spring 22 are sandwiched between the intermediate collar 17 and the second collar 32. Therefore, the urging force of the pressure coil spring 22 can be adjusted by the position of the second collar 32.

  The auxiliary coil spring 21 is provided to assist the drive motor 26 when the second heat seal bar 15 is raised to prevent buckling of the crank mechanism, and has a weak biasing force. Therefore, the auxiliary coil spring 21 can be omitted. On the other hand, the pressurizing coil spring 22 has a strong biasing force for pressurizing the second heat seal bar 15 toward the first heat seal bar 16 as described later.

  The 1st holding | maintenance part 14 is provided with a pair of projection part 40 which protrudes upwards in the both sides. The heat seal bar driving device 60 includes a pair of first stoppers 41 that can advance and retract in the width direction Y in the first space C1 between the protrusion 40 and the second holding unit 13. The first stopper 41 is advanced and retracted by a first actuator 61 such as an air cylinder.

  When the moving unit 10 is disposed at the top dead center, a first space C1 is generated between the protrusion 40 and the second holding unit 13. The height of the first stopper 41 in the vertical direction Z is substantially the same as the height of the first space C1 in the vertical direction Z.

  The heat seal bar driving device 60 includes a pair of second stoppers 42 that can advance and retract in the width direction Y in the second space C <b> 2 between the second holding portion 13 and the intermediate collar 17. The second stopper 42 is advanced and retracted by a second actuator 62 such as an air cylinder.

  There is a second space C <b> 2 between the second holding unit 13 and the intermediate collar 17. The height of the second stopper 42 in the vertical direction Z is substantially the same as the height of the second space C2 in the vertical direction Z. As shown in FIG. 3B, the second stopper 42 includes a recess 42 a that can be fitted to the second moving pole 12. When the concave portion 42a of the second stopper 42 is fitted to the second moving pole 12, the second stopper 42 can support the entire width direction Y of the intermediate collar 17, so that the inclination of the intermediate collar 17 in the width direction Y can be prevented.

[Movement operation (heat seal operation)]
A moving operation (heat sealing operation) in which the second heat seal bar 15 approaches the first heat seal bar 16 will be described.
As shown in FIG. 4, when the first and second heat seal bars 16 and 15 are used to heat seal the body materials 1 and 2, the first stopper 41 is disposed away from the first space C <b> 1, while the second stopper 42 is Arranged in the second space C2. Due to the rotation of the drive motor 26, the moving unit 10 descends from the top dead center. Thereby, the 2nd heat seal bar 15 contact | abuts to the trunks 1 and 2 on the 2nd heat seal bar 15 (heat seal start point).

  Thereafter, as shown in FIG. 5, when the moving unit 10 further descends and reaches the bottom dead center, a third space C <b> 3 is generated between the second holding unit 13 and the first collar 31. Further, a gap that is the same as the height of the third space C3 is also generated between the intermediate collar 17 and the restricting portion 18. While the third space C3 is generated, the pressurizing coil spring 22 pressurizes the intermediate collar 17, the second stopper 42, and the second holding portion 13, and the second heat seal bar 15 fixes the body members 1,2. Heat seal strongly. As in the prior art, the amount of movement of the moving unit 10 from the heat seal start point to the bottom dead center is referred to as “live”. The amount of movement “siki” is not large (about 1 mm).

[Non-moving operation (non-heat sealing operation)]
A non-moving operation (non-heat sealing operation) in which the second heat seal bar 15 does not approach the first heat seal bar 16 will be described.
As shown in FIG. 6, when the first and second heat seal bars 16 and 15 do not heat seal the barrels 1 and 2, the first stopper 41 is disposed in the first space C <b> 1 while the second stopper 42 is the second stopper 42. It is arranged away from the space C2. Due to the rotation of the drive motor 26, the moving unit 10 descends from the top dead center.

  Although the moving part 10 is lowered, the second holding part 13 is not lowered by the first stopper 41. On the other hand, since the second collar 32 and the intermediate collar 17 can be lowered together with the moving unit 10 by the second space C2, the pressure coil spring 22 is not greatly compressed. Therefore, a large load is not applied to the drive motor 26.

As mentioned above, although preferable embodiment of this invention was described, the structure of this invention is not limited to these embodiment.
The first and second collars 31 and 32 do not have to be nut type, and may be any known technique that can be moved and fixed with respect to the first and second moving poles 11 and 12.
The heat seal bar driving device 60 may drive the vertical heater 4.
The first holding unit 14 is fixed so as not to descend when the heat sealing operation is performed, but the state in which the body 2 is arranged immediately above the first heat sealing bar 16 when the heat sealing is not performed continues. In order to avoid such a situation, the first holding portion 14 may be separated from the body when the feeding operation of the bodies 1 and 2 is stopped.
In the above embodiment, the horizontal heaters 51, 52, 53, 54 are extended in the horizontal width direction Y, but may be extended in the vertical direction Z.

1, 2 Body 10 Moving part 11 First moving pole 12 Second moving pole 13 Second holding part 14 First holding part 15 Second heat seal bar 16 First heat seal bar 17 Intermediate collar 18 Restricting part 18a Small diameter part 18b Large-diameter portion 22 Pressurizing coil spring 31 First collar 32 Second collar 41 First stopper 42 Second stopper 42a Recess C1 First space C2 Second space X Feeding direction (length direction)
Y Width direction Z Vertical direction

Claims (6)

A heat seal bar driving device that is provided in a bag making machine that heat seals at least two body members with first and second heat seal bars, and that moves the second heat seal bar toward and away from the first heat seal bar In
A first holding part for holding the first heat seal bar;
A second holding part for holding the second heat seal bar;
A moving part that reciprocates between top dead center and bottom dead center;
A first collar provided on the moving part and supporting the second holding part;
A second collar provided in the moving part;
An intermediate color provided in the moving unit and disposed between the first color and the second color;
A pressure coil spring disposed between the second collar and the intermediate collar and pressurizing the second heat seal bar;
A first stopper disposed and separated in a first space between the first holding part and the second holding part;
A second stopper disposed and separated in a second space between the second holding part and the intermediate collar,
When the second heat seal bar is close to the first heat seal bar,
The first stopper is spaced from the first space, while the second stopper is disposed in the second space;
When the second heat seal bar is not close to the first heat seal bar,
The heat seal bar driving device according to claim 1, wherein the first stopper is disposed in the first space, and the second stopper is separated from the second space. Furthermore, it is provided in the moving part and includes a restricting part that restricts the intermediate collar.
2. The restricting portion restricts movement of the intermediate collar toward the second support portion, but does not restrict movement of the intermediate collar toward the coil spring. The heat seal bar drive device described. The restricting portion comprises an upper small diameter portion and a lower large diameter portion,
The heat seal bar driving device according to claim 2, wherein the intermediate collar is inserted into the upper small diameter portion and supported by the lower large diameter portion. The moving unit is
A pair of first moving poles and a pair of second moving poles arranged at intervals in the width direction;
4. The heat seal bar driving device according to claim 1, wherein the first moving poles and the second moving poles are connected to the same axis in the vertical direction. The first collar is provided on the first moving pole,
The heat seal bar driving device according to claim 4, wherein the second collar and the intermediate collar are provided on the second moving pole. 6. The heat seal bar drive device according to claim 4, wherein the second stopper includes a recess that can be fitted to the second moving pole. 7.

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