JP3127017U - Square bottom paper bag creasing device - Google Patents

Abstract

An object of the present invention is to provide a crisscross paper bag creasing device capable of automatically forming a crease in a flap and adjusting the interval between members in accordance with the change in the bottom width without stopping the operation. .
A scoring drum (1) comprising a first bracket (3), a second bracket (4), and a third bracket (5) arranged coaxially is provided, and the outer periphery of the first bracket (3) has a first folding line at the position of the fold line of the back side flap. A first gripping portion 10 that receives the first pushing blade 2a is provided, and a second gripping portion 17 that receives the second pushing blade 2b is provided on the outer peripheral portion of the second bracket 4 at the folding line position of the front side flap. 5 is provided with a pressing claw 23 for pressing the tip of the back flap, the first bracket 3 is fixed to the drive shaft, and the second bracket 4 and the third bracket 5 are respectively connected via a transmission capable of adjusting the transmission ratio. Connect to the drive shaft.
[Selection] Figure 2

Description

  The present invention relates to a corner bottom paper bag creasing apparatus that is incorporated in a bag making machine and performs creasing along a folding line of a bottom flap of a square bottom paper bag.

A square-bottomed paper bag with ridges is a paper cylinder with folds folded on both sides, sent to the bottom folding device, and opened near the bottom of the paper cylinder from the bottom opening line along the width direction to both the front and back sides. And the front and back side flaps are folded along a folding line parallel to the bottom opening line and overlapped with each other to form a square bottom.
Conventionally, as a scoring device that creases the front and back side flaps that form the square bottom, a pair of cuts are provided at a certain interval in a large cylinder that transports a paper tube, and one side cut edge of the cut Install a pawl that contacts and separates from each other, and provide a push-in pawl that enters into each incision and forms a folding line on the front flap and the back flap adjacent to the large cylinder. Hold the part where the pawl is pushed in by the push-in pawl, lift the outer side diagonally, scoop up the raised part on the rear side with a pressing plate and fold it back, and hit the raised part on the front side against the arc guide An automatic bottom-bottom paper bag making machine is known (see Patent Document 1).

  In addition, a bottom folding drum is constituted by an assembly of divided drums, and a groove portion is formed between each divided drum, in which catching claws that sandwich the front end of the back flap and clamping claws that bite the front and rear fold lines of the back flap are alternately arranged. The catch claws and clamping claws mounting brackets are bolted to the mounting cylinders around the rotating shaft of the bottom folding drum, and the opening and closing claws that bit the front and rear fold lines of the front flap are assembled on both sides of the bottom folding drum The opening / closing claw mounting bracket is guided so as to be slidable in the axial direction of the bottom folding drum with respect to the support bracket fixed to the mounting cylinder of the bottom folding drum rotating shaft. A square bottom bag creasing device is also known in which two pressing blades that are pressed along a fold line are rotatably provided (see Patent Document 2).

By the way, the width of the bottom of the paper bag varies depending on the size and type of the bag, and the distance between the folding lines of the front and back side flaps increases or decreases accordingly.
However, in the above-mentioned conventional device, the bottom of the bag opening changes or every time fine adjustment is performed, the device is stopped, the lock bolts are loosened, the parts are removed, the back flap is folded, and the front flap is It is necessary to adjust the relative distance between the fold-fitting member and the clamping claws that hold the back flap, and then re-tighten the lock bolt to assemble, which makes the work cumbersome and reduces manufacturing efficiency. It was also a factor.

Japanese Patent Publication No.46-18948 JP-A-8-90687

  The problem to be solved by the present invention is that in the process of forming the square bottom, it is possible to automatically crease along the folding line of the front and back flaps, and respond to changes in the bottom width without stopping operation Another object of the present invention is to provide a scoring device for a square bottom paper bag capable of adjusting a distance between members.

  The scoring device for the square bottom paper bag of the present invention is for scoring along the folding line parallel to the bottom opening line on the front and back flaps formed on both sides of the bottom opening line of the paper tube, A scoring drum that rotates with a paper tube placed on the outer peripheral surface, a first pushing blade that rotates in synchronization with the scoring drum, and presses along a folding line of a back flap of the paper tube placed on the scoring drum; The bottom folding drum includes a first bracket, a second bracket, and a third bracket that are coaxially installed, and the second folding blade presses along a folding line of the front flap. A first gripper that can be opened and closed to receive the first pushing blade is provided on the outer periphery, and a second gripper that can be opened and closed to receive the second pushing blade is provided on the outer periphery of the second bracket. Outside the third bracket A pressing claw for detachably pressing the front end of the back side flap is provided on the part, the first bracket is fixed to the drive shaft, and the driving is performed via a transmission that can adjust transmission of the second bracket and the third bracket, respectively. The transmission is connected to a shaft, and the transmission changes the phase of the second bracket and the third bracket with respect to the first bracket to adjust the distance from the first gripping portion to the second gripping portion and the presser claw. The first pushing blade and the second pushing blade rotate in conjunction with the first bracket and the second bracket, respectively.

A differential gear device, a wave gear device, or the like is used as the first transmission device and the second transmission device.
A plurality of first gripping portions, second gripping portions, and pressing claws may be arranged at equal intervals on the outer circumferences of the first bracket, the second bracket, and the third bracket.

  According to the present invention, it is possible to determine the pressing claw for pressing the front end portion of the back side flap and the folding line position of the front side flap with respect to the first gripping portion for determining the back line folding line position without stopping the operation. Since the position of the second gripping portion can be changed, it is possible to automatically and efficiently crease the square bottom paper bags having various bottom widths.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The creasing apparatus of the present invention is incorporated in a bag making machine that automatically manufactures a square bottom paper bag. As shown in FIG. 2, a creasing drum 1 that rotates by placing a paper tube a in the middle of production, and a creasing A first pushing blade 2a and a second pushing blade 2b installed adjacent to the drum 1 are provided.
As shown in FIG. 1A, the paper tube a conveyed by the scoring drum 1 has ridges formed on both sides in the previous step, and the bottom of the paper tube a is close to the bottom opening line b along the width direction. And is glued to the front end portions of the back side flap c and the front side flap d formed on both sides of the bottom opening line b.

In this creasing apparatus, as shown in FIG. 1B, creases are attached to the back side flap c and the front side flap d along folding lines e and f parallel to the bottom opening line b, respectively.
Next, the creasing device is sent to a subsequent process, and as shown in FIG. 1 (c), the back side flap c and the front side flap d are folded back inward from the folding lines e and f, and the leading ends overlap each other. Is done.

As shown in FIGS. 2 and 3, the scoring drum 1 includes a first bracket 3, a second bracket 4, and a third bracket 5 that are installed coaxially.
The outer periphery of the 1st bracket 3, the 2nd bracket 4, and the 3rd bracket 5 is arrange | positioned on the same periphery, comprises the outer peripheral surface of the creasing drum 1, and the drive shaft 6 is arrange | positioned along the central axis. ing.
A main gear 7 is fixed to the outer periphery of one end of the drive shaft 6, and an output gear 8 is fixed to the outer periphery of the other end. The main gear 7 is connected to a drive motor (not shown), and when the drive motor is operated, the drive shaft 6 is rotated.

The first bracket 3 is fixed to the drive shaft 6 and rotates integrally with the drive shaft 6. Further, the first bracket 3 is provided with a plurality of first arms 9 extending radially at equal intervals, and provided with a first gripper 10 that can be opened and closed at the tip of the first arm 9.
The first gripping portion 10 includes a fixed claw 11 and a swing claw 12 that swings so as to come in contact with and separate from the fixed claw 11, extending in the axial direction of the creasing drum 1 (the width direction of the paper tube a). . The fixed claw 11 and the swinging claw 12 are arranged so as to face each other, and the swinging claw 12 is urged to approach the fixed claw 11.

The second bracket 4 is fixed around the mounting cylinder 13 that is loosely fitted on the outer periphery of one half of the drive shaft 6. A first input gear 14 is fixed to the outer periphery of one end of the mounting cylinder 13, and the first input gear 14 and the main gear 7 of the drive shaft 6 are connected via a first transmission 15 that can adjust the transmission ratio. Yes. Therefore, when the drive shaft 6 rotates, the second bracket 4 rotates together with the first bracket 3.
The second bracket 4 has the same number of second arms 16 as the first arms 9 of the first bracket 3 projecting radially at equal intervals, and a second gripping portion 17 that can be opened and closed at the tip of the second arm 16. Installed.

The second gripping portion 17 includes a fixed claw 11 ′ that extends in parallel with the first gripping portion 10 and swings so as to swing toward and away from the fixed claw 11 ′. The fixed claw 11 ′ and the swing claw 12 ′ are arranged so as to face each other along the axial direction of the creasing drum 1, and the swing claw 12 ′ is urged so as to be close to the fixed claw 11 ′.
Further, the second barb 17 is located upstream of the first barb 10 in the rotational direction of the scoring drum 1.

The third bracket 5 is fixed to one end of a rotating cylinder 19 that is loosely fitted on the outer periphery of the other half of the drive shaft 6. A second input gear 20 is fixed to the outer periphery of the other end of the rotary cylinder 19, and the second input gear 20 and the output gear 8 of the drive shaft 6 are connected via a second transmission 21 that can adjust the transmission ratio. Has been. Accordingly, when the drive shaft 6 rotates, the third bracket 5 rotates together with the first bracket 3.
The third bracket 5 has the same number of third arms 22 as the first arm 9 and the second arm 16 projecting radially at equal intervals, and a pressing claw 23 is attached to the tip of the third arm 22.

The presser claw 23 is composed of a pair of left and right strips curved so as to follow the outer peripheral surface of the scoring drum 1, and is located downstream of the first gripping part 10 in the rotation direction of the scoring drum 1 and has a tip part thereof. It is installed so as to face the outer peripheral surface of one bracket 3.
As shown in FIG. 4, a rotating roller 25 is connected to the proximal end portion of the presser claw 23, and the rotating roller 25 moves on the outer peripheral surface of a cam 26 that is arranged coaxially with the creasing drum 1. Then, due to the change in the distance between the rotating roller 25 guided by the cam 26 and the center of the scoring drum 1, the tip end portion of the presser claw 23 rotates so as to be in contact with and separated from the outer peripheral surface of the first bracket 3.
When the front end of the presser claw 23 approaches the outer peripheral surface of the first bracket 3, as shown in FIG. The rear side flap c is released when it moves away from the outer peripheral surface.

The first pushing blade 2a presses the paper tube a along the folding line e of the back side flap c, and is installed adjacent to the scoring drum 1 in parallel as shown in FIGS. The rotary shaft 24a is attached to the outer side in the radial direction.
The second pushing blade 2b presses along the folding line f of the front flap d, and the second pushing blade 2b is directed radially outward to the outer cylinder 24b loosely fitted on the outer surface of the rotating shaft 24a. Installed.

The outer cylinder 24b is formed with a notch 27 for allowing the first pushing blade 2a to move, and the first pushing blade 2a protrudes outward from the outer cylinder 24b through the notch 27.
A gear 28 is fixed to one end of the rotating shaft 24 a, and the gear 28 is connected to the main gear 7 fixed to the drive shaft 6. The first pushing blade 2 a is rotated at a constant speed in conjunction with the first bracket 3.

A gear 29 is fixed to the end of the outer cylinder 24 b, and this gear 29 is connected to the first input gear 14 fixed to the mounting cylinder 13. Accordingly, the second pushing blade 2 b rotates in conjunction with the second bracket 4.
When the phase of the first bracket 3 and the second bracket 4 changes, the angle between the second pushing blade 2b and the first pushing blade 2a interlocked with the second bracket 4 also changes, but the second pushing blade 2b has a notch 27. Within the range of the first pushing blade 2a.

Since the first transmission device 15 and the second transmission device 21 have basically the same structure, only one of them is shown in the drawing.
As shown in FIG. 7, the first transmission device 15 and the second transmission device 21 include an adjustment gear 30, a gear bracket 31 fixed to the adjustment gear 30, and a pair of bevel gears 32 a provided in the gear bracket 31. 32b, an input shaft 33 and an output shaft 34 respectively connected to the centers of the bevel gears 32a and 32b, a differential shaft 35 attached to the gear bracket 31, and an outer periphery of the differential shaft 35. The differential gear device includes a pair of bevel pinions 36a and 36b.

The input shaft 33 and the output shaft 34 are disposed on the central axis of the adjustment gear 30, the differential shaft 35, the input shaft 33, and the output shaft 34 extend in directions perpendicular to each other, and the bevel pinions 36a, 36b are bevel gears 32a, 32b. Are engaged.
A gear 37 is fixed to the input shaft 33, and a gear 38 is fixed to the output shaft 34. The gear 37 of the first transmission 15 is connected to the main gear 7 of the drive shaft 6, and the gear 37 of the second transmission 21 is connected to the output gear 8 of the drive shaft 6.
The gear 38 of the first transmission 15 is connected to the first input gear 14 of the mounting cylinder 13, and the gear 38 of the second transmission 15 is connected to the second input gear 20 of the rotary cylinder 19. Yes.

Accordingly, when the drive shaft 6 is rotated, the input shaft 33 of the first transmission device 15 and the second transmission device 21 and the bevel gear 32a attached to the outer periphery thereof rotate, and the bevel pinions 36a and 36b meshed with the input shaft 33 rotate. Rotates around the differential shaft 35, the bevel gear 32b engaged with the bevel pinions 36a and 36b rotates, and the output shaft 34 rotates in reverse at the same speed as the input shaft 33.
The output shaft 34 of the first transmission 15 is connected to the mounting cylinder 13, and the output shaft 34 of the second transmission 21 is connected to the rotating cylinder 19, and the second bracket 4 fixed to the mounting cylinder 13 and The third bracket 5 fixed to the rotary cylinder 19 rotates in the same direction at the same speed as the first bracket 3 fixed to the drive shaft.
The first gripping portion 10 provided on the first bracket 3, the second gripping portion 17 provided on the second bracket 4, and the presser claw 23 provided on the third bracket 5 rotate while maintaining the same interval. To do.

When the adjustment gear 30 is rotated forward or backward by a motor or human power, the gear bracket 31 and the differential shaft 35 are rotated together with the adjustment gear 30, and the bevel pinions 36 a and 36 b attached to the differential shaft 35 are also input shaft 33. And rotate about the central axis of the output shaft 34.
As a result, the input shaft 33 and the output shaft 34 are out of phase, and the mounting cylinder 13 and the rotating cylinder 19 also rotate relative to the drive shaft 6.
Thereby, the distance from the 1st grip part 10 to the 2nd grip part 17 and the press nail | claw 23 expands / contracts.
The adjustment gear 30 of the first transmission 15 and the adjustment gear 30 of the second transmission 21 are simultaneously rotated. At this time, the second bracket 4 and the third bracket 5 are in relation to the first bracket 3. Thus, the second gripping portion 17 and the presser claw 23 are simultaneously moved away from or approached to the first gripping portion 10.

In this creasing device, the back flap c and the front flap d are creased as follows.
The paper tube a fed into the scoring drum 1 with the bottom open is placed on the outer surface of the scoring drum 1 with the back flap c at the bottom facing downstream in the rotational direction.
The paper drum a has a creasing drum so that the portion of the back flap c that is the fold line e coincides with the first gripping portion 10, and the portion of the front flap d that is the wrap line f matches the second gripping portion 17. 1 and is conveyed in a state where both sides of the front end portion of the back side flap c are sandwiched between the pressing claw 23 and the outer peripheral surface of the first bracket 3.
At this time, the clutch is disengaged in the first transmission device 15 and the second transmission device 21, and the first bracket 3, the second bracket 4 and the third bracket 5 rotate at the same speed, The first barb 10 and the second barb 17 rotate while maintaining the same distance.

When the fold line e of the back side flap c reaches the lower side of the first pushing blade 2a, the holding claw 23 releases the back side flap c.
Further, the first pushing blade 2a is inserted between the fixed claw 11 and the swinging claw 12 of the first gripping portion 10 and presses the paper tube a along the folding line e, so that the swinging claw 12 and the fixed claw 11 are pressed. Receive the first pushing blade 2a and bite the front and rear of the folding line e.
As a result, the front end portion of the back side flap c jumps up obliquely, and a crease is attached along the folding line e.

When the folding line f of the front side flap d reaches the lower side of the second pushing blade 2b with the rotation of the creasing drum 1, the second pushing blade 2b is brought into contact with the fixed claw 11 'and the swing claw of the second gripping portion 17. The paper tube a is pressed along the folding line f.
Further, the swinging claw 12 ′ and the fixed claw 11 ′ receive the second pushing blade 2b and bite the front and rear of the fold line f.
Then, the front end portion of the front flap d jumps up, and a crease is attached along the folding line f.
The paper tube a with creases is fed from the creasing device to the next folding device, and the front side flap d is folded on the back side flap c.

In the case of manufacturing a paper bag having a wide bottom width, the adjustment gear 30 of the first transmission device 15 and the second transmission device 21 is rotated to change the phases of the input shaft 33 and the output shaft 34, and the second bracket. 4 and the holding claw 23 provided on the third bracket 5 are moved away from the first gripping part 10 provided on the first bracket 3.
On the other hand, when manufacturing a paper bag with a narrow bottom width, the adjustment gear 30 of the first transmission device 15 and the second transmission device 21 is reversely rotated so that the second gripping portion 17 and the presser claw 23 are moved to the first bag. Close to the gripper 10.

Since the rotation amount of the adjustment gear 30 is determined according to the phase adjustment amount between the input shaft 33 and the output shaft 34, the second gripping portion 17 and the presser claw 23 are moved by rotating the adjustment gear 30 by a predetermined amount. It can be moved by the required distance.
Further, since the outer cylinder 24b rotates in conjunction with the second bracket 4, the second pushing blade 2b automatically moves relative to the first pushing blade 2a, and the second pushing portion 17 causes the second pushing blade 17 to move. 2b can be received reliably.

When the adjustment gear 30 is rotated by a motor, the number of rotations of the motor is controlled in accordance with the paper bag standard, and the distance between the first gripping portion 10, the second gripping portion 17, and the presser claw 23 is automatically set. It is also possible to adjust.
The first transmission device 15 and the second transmission device 21 can also use wave gear devices or the like.

The top view of the paper cylinder which shows the folding process of a square bottom. The principal part side view of the scoring apparatus of the square bottom paper bag which shows the Example of this invention. The figure which shows the power transmission path | route of the creasing device of the square bottom paper bag which concerns on the Example of this invention. The side view which shows the rotation mechanism of a press nail | claw. The longitudinal cross-sectional view of a 1st pushing blade and a 2nd pushing blade. The cross-sectional view of a 1st pushing blade and a 2nd pushing blade. Sectional drawing of a transmission.

Explanation of symbols

a paper tube b bottom opening line c back side flap d front side flap e, f folding line 1 scoring drum 2a first pushing blade 2b second pushing blade 3 first bracket 4 second bracket 5 third bracket 6 drive shaft 7 main gear 8 Output gear 9 First arm 10 First gripping part 11, 11 ′ Fixed claw 12, 12 ′ Oscillating claw 13 Mounting cylinder 14 First input gear 15 First transmission 16 Second arm 17 Second gripping part 19 Rotating cylinder 20 Second input gear 21 Second transmission 22 Third arm 23 Holding claw 24a Rotating shaft 24b Outer cylinder 25 Rotating roller 26 Cam 27 Notch 28, 29 Gear 30 Adjusting gear 31 Gear bracket 32a, 32b Bevel gear 33 Input shaft 34 Output shaft 35 Differential shaft 36a, 36b Bevel pinion 37, 38 Gear

Claims (2)

  A scoring device for a square-bottom paper bag that performs creasing along front and back flaps formed on both sides of a bottom opening line of a paper tube along a fold line parallel to the bottom opening line, wherein the paper tube is disposed on an outer peripheral surface. And a second pushing blade that presses along the folding line of the back flap of the paper tube placed on the scoring drum, and a second pushing blade that presses along the folding line of the front flap The scoring drum includes a first bracket, a second bracket, and a third bracket that are coaxially installed, and an openable / closable first receiving blade is provided on an outer peripheral portion of the first bracket. A first gripping portion is provided, a second gripping portion that can be opened and closed to receive the second pushing blade is provided on the outer peripheral portion of the second bracket, and a front end portion of a back flap is engaged / disengaged on the outer peripheral portion of the third bracket. Push to possible A holding claw is provided, the first bracket is fixed to the drive shaft, and the second bracket and the third bracket are connected to the drive shaft via transmission gears each capable of adjusting a transmission ratio. By changing the phase of the second bracket and the third bracket with respect to one bracket, the distance from the first gripping part to the second gripping part and the presser claw is adjusted, and the first pressing blade and the second pressing blade are adjusted. Is a crooked paper bag creasing device that rotates in conjunction with the first bracket and the second bracket, respectively.   The square bottom according to claim 1, wherein a plurality of first gripping portions, second gripping portions, and pressing claws are arranged at equal intervals on the outer circumferences of the first bracket, the second portion racket, and the third bracket, respectively. Paper bag creasing device.

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