JPH06238781A - Bag manufacturing machine from paper cylinder for paper bag - Google Patents

Abstract

PURPOSE:To from continuously a paper cylinder for a large-sized paper bag which does not receive any ristriction of a printing machine. CONSTITUTION:Papers 1A and 1B for bags are fed into a folding machine 11A by means of a paper feeding machine 10A. One side part of each of the papers 1A and 1B for bags is folded into approximately an M-shape by means of the folding machine 11A. The paper 1A for the bag folded by means of the folding machine 11A is placed on a rail by means of a paper transferring apparatus 12A. This paper 1A for the bag is carried by means of a carrying apparatus 16 and after a paste is applied thereon by means of a pasting apparatus, it is carried on the rail. On the other hand, the paper 1B for the bag is turned over by means of a reversing lever and a paper reversing and carrying apparatus 12B and is kept in waiting for on the rail to laminate the papers 1A and 1B. Then, the papers 1A and 1B laminated up and down are bonded together by means of a press apparatus to mold a paper cylinder for a paper bag. Therefore, as the paper cylinder 3 for the paper bag is molded by using two sheets of papers 1A and 1B, the width for the paper bag plus a folding space of one side is enough for the width of the papers 1A and 1B for the bags.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-making machine for a paper-bag paper tube, which continuously forms a paper tube used as a paper bag such as a shopping bag.

[0002]

2. Description of the Related Art Conventionally, a paper bag such as a shopping bag is folded in a substantially M shape on both sides and the bottom is folded to form a square bottom portion. When molding such a square-bottomed paper bag, first, a flat paper tube having both sides folded into a substantially M-shape is made, and the bag mouth of the paper tube is folded to perform bottom folding to form the bottom of the paper bag. And as a method to make a flat paper tube,
As shown in Fig. 1, one edge of the bag paper 1 and the substantially central portion are folded in an M shape, glued to the outer edge of the bag paper 1, and then the bag paper 1 is folded in half from the center. By adhering the glued portions on the outer edge, a flat paper cylinder 3 having M-shaped folding portions 2 on both sides and having front and rear openings is formed. Then, the paper tube 3 thus folded in two is supplied to a square-bottom bag making machine to fold the bottom of the paper tube 3 to form a square-bottom paper bag.

[0003]

By the way, in recent years, a landscape, a person, or various patterns may be printed on a paper bag in order to enhance the decorativeness of the paper bag. When printing on the paper bag, the paper bag is folded. The bag paper 1 is printed before the bag paper 1 is folded. A sheet-fed printing machine is mainly used for printing on the bag paper 1, but there is a limit to the body width size of a general sheet-fed printing machine. Naturally, the width W of the printable bag paper 1 is the body width. Within the maximum width of size. However, in the conventional method of folding the bag paper 1 into two to form the paper tube 3, the width of the paper bag including the folding portion 2 is at least twice as large as the bag width. If the bag width of the paper tube 3 is a standard size, it is within the range of the body width size of a general sheet-fed printing machine, and printing on the bag paper 1 is not hindered. There are some large-sized paper bags whose width exceeds 500 mm. As described above, in the large-sized paper bag, the width W of the bag paper 1 is 1200 mm or more in the method of folding the paper cylinder 3 in two and the maximum width (1200 mm) of the body width size of a general sheet-fed printing press is obtained.
Will exceed. Therefore, it is impossible to print the bag paper 1 by a general sheet-fed printing machine, and a custom-made sheet-fed printing machine having a large body width size is required to print a large-sized paper bag. It is virtually impossible to use a printing machine, and even if a custom-made sheet-fed printing machine is used, the manufacturing cost will be extremely high. I had to rely on.

The present invention is intended to solve such a problem, and it is possible to mold a large-sized paper bag having a large bag width with a bag paper that can be printed by a general sheet-fed printing machine having a body width. An object of the present invention is to provide a bag making machine for a paper bag and a paper tube.

[0005]

According to the present invention, two paper feeding devices for feeding bag paper are arranged side by side, and the leading edge portion of the bag paper is folded into a substantially M-shape and folded into each of these paper feeding devices. The folding machines that form a section are respectively provided in series, and rails that support the bag paper having the folding section are provided at the bottom of these folding machines, and between the one folding machine and the rail, A paper feeding device for pulling out the bag paper to be sent out and guiding the folding part of the bag paper to the front side toward the rail is provided, and is fed from the folding machine between the other folding machine and the rail. It has a reversing mechanism for guiding the front end side of the bag paper in a direction opposite to the feeding direction of the paper feeding device,
A paper reversing feed device is provided for holding the bag paper sent via this reversing mechanism on the rail with the folded part facing the back side, and below the rail, the bag paper on the rail is stacked vertically. In addition to providing a transporting device for transporting together, a sizing device for gluing to both side edges of the bag paper sent from the paper transporting device is installed side by side with the transporting device, and a bag that is vertically stacked on the end side of the transporting device. It is provided with a press device for sandwiching and sticking sheets.

[0006]

According to the present invention, the bag paper is supplied to the folding machine by the paper supply device, and the leading edge of the bag paper is folded into a substantially M-shape by the folding machine. Then, the bag paper folded by one of the folding machines is placed on the rail by the paper feeding device with the folding portion facing the front side. This bag sheet is conveyed by a conveying device, and both sides of the sheet are pasted by a pasting device during the conveyance, and then the bag sheet is conveyed to a rail provided under the other folding machine. In addition, bag paper folded by the other folding machine is guided by the reversing mechanism in the direction opposite to the feeding direction of the paper feeding device, and is pulled out by the paper reversing feeding device so that the folding part is on the back side and stands by on the rail. Then, after that, the bag paper adhered by the conveying device sneaks into the lower surface side of the bag paper waiting on the rail, and the bag papers are vertically stacked. Then, the bag sheets stacked vertically are conveyed to the pressing device by the conveying device, and are bonded by the pressing device to form a paper tube for a paper bag. Since the paper cylinder for a paper bag molded in this way is formed by bonding two bag papers together, the width of the bag paper is the width of the paper bag plus the approximately M-shaped folded portion. It is possible, and the width can be sufficiently limited to be printed by a general printing machine.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 13 show an embodiment of the present invention. When the same parts as those of the above-mentioned conventional example are designated by the same reference numerals, the present invention shows that two bag sheets 1A and 1B are bonded together. The paper bag paper tube 3 is formed. As shown in the schematic views of FIGS. 1 to 3, the bag making machine for the paper bag paper tube 3 has a bag paper 1
A and 1B are supplied to the folding machines 11A and 11B by two paper supply devices 10A and 10B arranged in parallel, and the folding machines 11A and 11B make one side of each bag paper 1A and 1B substantially M-shaped. Fold in. The two paper feeding devices 10A and 10B and the folding machines 11A and 11B arranged side by side have substantially the same structure. The bag paper 1A folded by one of the folding machines 11A is fed to the paper feeding device 12
It is sent to the rail 13 by A and is conveyed to the rail 14 provided on the other folding machine 11B side by the conveying device 16, and the bagging paper 1A is glued by the gluing device 17 during the transportation. On the other hand, the bag paper 1B folded by the folding machine 11B has a reversing lever 15
Then, the sheet is turned upside down by the paper reversing / feeding device 12B, is fed out onto the rail 14, and stands by on the rail 14. After this,
The sacked bag paper 1A is made to slip into the lower side of the bag paper 1B waiting on the rails 14 by the conveying device 16 and each bag paper 1
A and 1B are piled up and down. Then, the bag papers 1A and 1B on the rails 14 are conveyed to the press device 18 while being bonded by the transfer device 16, and further, the bag papers 1A and 1B are pressed by the press device 18 to form the paper tube 3 for the paper bag. To do.

Explaining in more detail, the bag paper 1
As shown in FIGS. 1 and 2, A and 1B are preliminarily cut into a predetermined size according to the size of the paper bag, and are stacked inside the paper storage unit 20 provided corresponding to each paper supply device 10A and 10B. It is stored. A plurality of lifting guide rods 21 are provided inside the paper storage unit 20, and the lifting guide rods 21 are provided.
The receiving plate 23 for the bag paper 1A (bag paper 1B) is placed on the upper and lower two-stage lifts 22 attached to the. Then, the elevator 22 is intermittently raised by an elevator drive mechanism (not shown) to move the uppermost bag paper 1A (bag paper 1B) to the frame frame of the paper storage unit 20.
24 After being positioned below the rotary transport roller 25 attached to the upper part, the air blow mechanism (not shown) floats the uppermost bag sheet 1A to bring it into contact with the rotary transport roller 25. Bag paper 1A (bag paper 1B) placed on the upper lift 22 is sequentially fed to the paper feeding devices 10A and 10A.
Continuously send to B side. In this way, bag paper 1A
When the bag paper 1A (bag paper 1B) that has been sent out (bag paper 1B) and placed on the upper lift table 22 is gone, the backing plate 23 that was placed on the upper lift table 22 is removed, and the lower lift table 22 is removed. The bag storage unit 1A (bag paper 1B) placed on the side is brought into close contact with the rotary transport roller 25 in the same procedure as the bag paper 1A (bag paper 1B) placed on the upper lift table 22 described above, and thereby the paper storage unit A paper supply device 10 that quickly switches the upper and lower bag paper 1A (bag paper 1B) that are stacked and accommodated in a large number inside 20
Continuously send to A and 10B.

The paper feeders 10A and 10B are shown in FIGS.
As shown in FIG. 3, a conventionally known conveyor device 32 including an upper conveyor 32A and a lower conveyor 32B, each of which has an endless belt 30 wound around a shaft 31, and a drive rotary shaft 33 provided on the front side of the conveyor device 32 in the conveying direction. This is a combination of a plurality of rotary conveyance claws 34 mounted and fixed at intervals.
The rotary transfer claw 34 is a disk 35 having a curved cutout 36 to form a sickle-shaped claw 37, and the lower part of the rotary transfer claw 34 has a curved shape covering the lower surface of the rotary transfer claw 34. A guide plate 38 is provided. Further, on the terminal side of the conveyor device 32, the bag papers 1A, 1A sent by the conveyor device 32,
L-shaped mounting plate for guiding the front end side of B to the rotary conveying claw 34
39 are provided. This mounting plate 39 has its mounting arm 40 mounted
It is fixed to a shaft 41 provided on the upper part of 39 and is rotatably attached. Further, a front plate 42 for positioning the mounting plate 39 is provided in front of the mounting plate 39. By connecting the contact plate 42 and the mounting arm 40 of the mounting plate 39 with a spring 43, the mounting arm 40 The stopper 44 provided at the end abuts against the contact plate 42, and the plate 39 described above is positioned on the lower surface side of the upper conveyor 32A and held substantially flush with the lower conveyor 32B. And the plate
The cam plate 45 that drives 39 is the drive rotation shaft of the rotary conveyance claw 34.
33 is integrally fixed to the shaft of the cam plate 45 and the plate 39 described above.
A rotary roller 47 that rolls along a cam plate 45 is pivotally supported by a link arm 48 that connects the shaft 41 and 41. Also, the cam plate 45
A cam surface 46 having an arc portion 46A and a flat portion 46B on the outer periphery of the
On the other hand, a long hole 48A for inserting into the drive rotary shaft 33 is cut out at one end of the link arm 48, and the long hole 48A is inserted into the drive rotary shaft 33 to form the link arm 48. The multi-end side thereof is pivotally attached to a connecting link arm 48B fixedly attached to the shaft 41 of the plate 39 described above. A spring 43A for constantly pressing the rotating roller 47 against the cam surface 46 is attached to the connecting link arm 48B. Then, the rotary roller 47 pivotally supported by the link arm 48 is rolled along the cam plate 45 rotating integrally with the drive rotary shaft 33 to operate the link arm 48, and the mounting plate 39 is rotated by the link arm 48. By doing so, the leading ends of the bag sheets 1A and 1B sent onto the mounting plate 39 are guided into the cutout portions 36 of the rotary conveying claw 35. In this way, the bag paper 1 guided by the rotary conveyance claw 35
A and 1B are sent to the suction drum 49 equipped with a vacuum mechanism (not shown) through the space between the rotary transport claw 34 and the guide plate 38 by the rotation of the rotary transport claw 34, and the suction drum 49 causes the bag paper 1A,
1B is sucked and the folding drum 49 is rotated to fold the folder 11A,
It is sent to the 11B side.

As shown in FIGS. 5 to 8, the folding machines 11A and 11B include first to third folding guide bodies 50, 51 and 52 for abutting the leading edges of the bag sheets 1A and 1B, and these folding units. Guide 5
The first to fourth sandwiching rollers 53A, 53B, 53C and 53D are configured to bite the slack of the bag sheets 1A and 1B caused by 0, 51 and 52 and to fold the bag sheets 1A and 1B. Inside the folding guides 50, 51 and 52, the bag paper 1
A stopper 54 for abutting the tip edges of A and 1B is provided. The stopper 54 is movably attached to the inside of each bending guide body 50, 51, 52 by an adjusting screw 55, and the stopper 54 By adjusting the position, each bending guide 5
It is possible to adjust the folding length according to the size of the paper bag by changing the insertion amount of the bag papers 1A and 1B to be inserted into 0, 51 and 52. In this case, since the second bending guide 51 is attached at a position where it is difficult for a hand under the suction drum 49 to enter, the link arm 56 is connected to the tip of the relatively long adjusting screw 55, and Stopper 54 via link arm 56
Is configured to move.

The first to fourth sandwiching rollers 53A, 53
As for the positional relationship between B, 53C and 53D, as shown in FIG. 5, both the first and second sandwiching rollers 53A and 53B have the suction drum 49.
The third sandwiching roller 53C is disposed below the second sandwiching roller 53A so as to be in contact with the second sandwiching roller 53B at a distance from the suction drum 49 while being in contact with the peripheral surface of the third sandwiching roller 53C. Laura 53
D is in contact with the third sandwiching roller 53C, and the third sandwiching roller 53
It is attached to the side of C. The second bending guide 51 of the bending guides 50, 51 and 52 is the suction drum.
It is positioned and fixed between 49 and the third sandwiching roller 53C, but the first and third folding guide bodies 50 and 52 are shown in FIG. 6 and FIG.
As indicated by the chain line, the cams 57 and 57A for driving each move the first bending guide body 50 vertically while slightly standing up, while the first bending guide body 50 moves substantially in the front-back direction. Move in parallel. The cams 57 and 57A for driving the first and third folding plans 50 and 52 are coaxially fixed to the cam shaft 58, and the first folding guide body 50 is attached to the mounting shaft by two connecting pieces 59 and 59. The third bending guide 52 is a connecting piece.
It is fixedly attached to the mounting shaft 60A by 59A. One end side of the link arms 61, 61A is pivotally supported by the connecting arms 62, 62A attached to the respective mounting shafts 60, 60A, and long grooves 63, 63A are formed by notching on the multi-end side of each of the link arms 61, 61A.
Is inserted into the cam shaft at 58. The rotary rollers 64, 64A rolling along the cams 57, 57A are axially supported by the link arms 61, 61A, and the rotary rollers 64, 64A are also supported.
In order to press 64, 64A against the respective cams 57, 57A, springs 65, 65A are connected to the connecting link arm 62 of the first bending guide body 50 and the link arm 61A of the third bending guide body 52.

Further, as shown in FIG. 8, a cam 57B for driving a paper pressing roller 67 which moves up and down along a pin 66 in the vicinity of the third sandwiching roller 53C is fixed to the cam shaft 58. , The paper pressing roller 67 has two connecting arms 59B,
It is attached to the attachment shaft 60B via 59C, and the connecting arm 59B is provided with a groove 68 into which the pin 66 is fitted. One end of a link arm 61B is connected and fixed to the mounting shaft 60B, and a cam 57 is provided on the multi-end side of the link arm 61B.
A rotary roller 64B that rolls along B is pivotally supported. A mounting arm 69 is integrally fixed to the mounting shaft 60B, and a spring 65B is mounted on the mounting arm 69 by pressing the rotating roller 64B against the cam 57B. And the camshaft 58
Of the rotating rollers 64, 64 that drive the cams 57, 57A, 57B by the rotation of the rollers and roll along the cams 57, 57A, 57B.
Each mounting shaft 60, 60A, 61B is rotated by the link arms 61, 61A, 61B to which A, 64B are mounted, and each mounting shaft 6
Rotation of 0, 60A, 61B causes the first and third folding guides 5
0 and 52 and the paper pressing roller 67 are configured to operate.

Further, the bag sheets 1A and 1B have the folding guides 50, 51 and 52 and the nipping rollers 53A, 53B, 53C and 53D.
Is conveyed while folding the tip edge portion, and finally the substantially M-shaped folding portion 2 is folded by the rotation of the third and fourth clamping rollers 53C and 53D, and the third and fourth clamping rollers It is sent below 53C and 53D. In this case, the bag paper 1A is sent to the paper feeding device 12A, while the bag paper 1B is sent to the paper reversing feeding device 12B. At this time, by lowering the paper pressing roller 67 and abutting it against the third sandwiching roller 53C, the bag papers 1A and 1B are prevented from rising and the bag papers 1A and 1B are stably fed.

The paper feeding device 12A and the paper reversing feeding device 12B
Have substantially the same structure. First, the paper feeding device 12A
Will be described with reference to FIG.

A long hole 72 is formed in a cam plate 71 fixed to the machine body frame A of the bag making machine, and a cam surface 73 having a flat portion 73A and an inclined portion 73B gently rising from the flat portion 73A is formed. A slide body 74 that reciprocates along the cam plate 71 is provided. A roller 75 moving along the long hole 72 and the cam surface 73 is pivotally supported on the slide body 74, and a bag sheet 1A sent from the folding machines 11A and 11B to the end of the slide body 74 via a mounting arm 76A. An openable / closable clamp member 76 for gripping the folding portion 2 at the tip is rotatably attached. The clamp member 76 is always urged in a closing direction by a spring (not shown), and the clamp member 76 is forcibly opened against the spring. Therefore, the upper surface of the clamp member 76 is provided with a U-shape provided on the machine body frame A. A projecting piece 79 having an engaging roller 78 for abutting against the receiving portion 77 having a shape of a circle and rotating the clamp member 76 in the opening direction is provided so as to project upward.

Further, the slide body 74 and the slide body
A link arm 80 that operates 74 is connected by a connecting arm 81, and a guide roller 82 attached to the link arm 80 is pressed by a spring 83 against the peripheral surface of an eccentric cam 84 that is a drive source of the slide body 74. Also, bag paper 1
At the paper discharge position of the folder 11A where A is sent out, the bag paper 1A
A guide plate 85 for guiding the to the clamp member 76 side is attached.

The slide body 74 is reciprocated along the cam plate 71 by the rotation of the eccentric cam 84, the bag member 1A is gripped by the clamp member 76 attached to the slide member 74, and the folding portion 2 of the bag sheet 1A is fixed. The bag paper 1A is pulled out to the front side in a state of being directed to the front surface side, and the bag paper 1A is sent out onto the rail 13 which is vertically installed on the cam plate 71. In this case, the clamp member 76 for pulling out the bag paper 1A passes through the rail 13, but the bag paper 1A pulled out by the clamp member 76 has the folding portion 2 formed at the leading edge thereof abutting against the rail 13, and the bag paper 1A is a clamp member. It escapes from 76 and is placed on rail 13.

Next, the paper reverse feeding device 12B will be described with reference to FIG. Since this paper reversing feeding device 12B has substantially the same configuration as the above-mentioned paper feeding device 12A, the same parts as those of the above-described paper feeding device 12A are designated by the same reference numerals and the detailed description thereof will be omitted.

The paper reversing / feeding device 12B includes a cam plate 71,
A slide body 74 that reciprocates along the cam plate 71.
And a clamp member 76 attached to this slide body 72,
An eccentric cam 84 serving as a drive source for the slide body 72 is provided, and the cam plate 71 and the slide body 74 are arranged symmetrically with respect to the paper feeding device 12A, and the clamp member 76 is gripped by the rotation of the eccentric cam 84. The bag paper 1B is pulled out in a direction opposite to the paper feeding direction of the paper feeding device 12A described above.
The folding part 2 is pulled out to the rear side in a state where the folding part 2 is directed to the back side. Further, in the paper reversing / feeding device 12B, a reversing lever 15 serving as a reversing mechanism is rotatably supported on a shaft 87 in place of the guide plate 86 of the paper feeding device 12A. One end of a connecting arm 88 is pivotally attached to the reversing lever 15, and a step 89 formed on the multi-end side of the connecting arm 88 is hooked on a pin 89 attached to the link arm 80 to link arm 80 and the reversing lever.
By connecting 15 to each other, the reversing lever 15 is operated like a pendulum about the shaft 87 in conjunction with the operation of the link arm 80. Then, the reversing lever 15 guides the bag paper 1B sent out from the folding machine 11B to the clamp member 76, and as the clamp member 76 moves, the bag paper 1B is reversed and made to stand by in a state of floating on the rails 14. . In this case, the bag paper 1A placed on the rail 13 by the paper feeding device 12A described above is conveyed by the conveying device 16 to the paper reversing feeding device.
The bag paper 1A is conveyed to the rail 14B on the 12B side, and the paper reversing / feeding device 12B makes the bag paper 1B stand by while floating on the rail 14 so that the bag paper 1A is put underneath and the bag papers 1A and 1B are superposed vertically. Therefore, the bag paper 1A in which the folding portion 2 is formed,
In 1B, as shown in FIG. 12, the bag paper 1A with the folding part 2 facing upward and the bag paper 1B with the folding part 2 facing downward vertically face each other, and the folding parts 2 do not overlap each other. ,
Located on rail 14.

As shown in FIGS. 9 and 10, the conveying device 16 has a set of two rotating pulleys 90A mounted on a shaft 90 facing each other, and a conveying belt 91 is endlessly attached to the rotating pulley 90A. This is a conventionally well-known structure in which an object to be conveyed (bag paper 1A, 1B) is conveyed by a feed claw 92 provided on a conveying bell 91. The carrying device 16 is arranged orthogonal to the machine body frame A so as to connect the folding machines 11A and 11B in series, and is located in the middle of the folding machines 11A and 11B during the carrying of the carrying device 16. Then, a gluing device 17 for spraying and gluing an emulsion type or hot melt type adhesive is disposed, and the bag papers 1A and 1B are pressed on the terminal side of the conveying device 16 by a pair of upper and lower nip rollers 95. A conventionally known press device 18 is provided. In this embodiment, the case where the adhesive is sprayed and glued is shown, but a wheel transfer type glue device using a belt may be used.

The operation of the present invention having the above structure will be described.

First, the elevating table 22 is raised to raise the bag papers 1A and 1B stored in the paper storage unit 20 in a stacked state by air to abut the conveying rollers 24, and the rotating conveying rollers 25 rotate. The bag papers 1A and 1B are continuously sent out onto the mounting plate 39 of the paper supply devices 10A and 10B. Plate 39
The upper bag papers 1A and 1B are rotated by the mounting plate 39 to form the bag paper 1
The leading end sides of A and 1B are guided into the cutout portion 36 of the rotary transport claw 34, and follow the rotation operation of the rotary transport claw 34, and the bag paper 1A, 1B
B is sent to the suction drum 49 through the gap between the guide plate 38 and the rotary transfer claw 34. Then, the bag paper 1 is attached to the suction drum 49.
A and 1B are sucked, and the bag papers 1A and 1B are sent to the folding machines 11A and 11B by the rotation of the suction drum 49.

Bag papers 1A, 1 sent to the folding machines 11A, 11B
B first enters the inside of the first folding guide body 50, and when its leading edge abuts against the stopper 54, the bag papers 1A and 1B are loosened by the rotation of the suction drum 49. In this case, since the folding guide body 50 receives the bag sheets 1A and 1B in the initial state, it is in close contact with the peripheral surface of the suction drum 49 and along the feeding direction of the bag sheets 1A and 1B supplied by the suction drum 49. Although it is inclined rearward, after it has entered the inside of the first folding guide body 50, it stands up while being rotated counterclockwise from the inclined state by the cam 57 that drives the first folding guide body 50. Thus, the slack portions of the bag sheets 1A and 1B are guided to the first pinching roller 53A side by changing the direction of the first folding guide body 50 in this manner. And bag paper 1
The slack generated in A and 1B is absorbed by the suction drum 49 and the first sandwiching roller.
By being bitten by 53A, a glue allowance 2A is formed on the leading end side of the bag sheets 1A and 1B in the feeding direction as shown in FIG. 11 (A). Thereafter, the bag sheets 1A and 1B with the glue margin 2A folded are sent out by the rotation of the suction drum 49 and the first and second sandwiching rollers 53A and 53B.
Enters the second folding guide body 51 arranged between the suction drum 49 and the third sandwiching roller 53C, and the slack generated in the bag sheets 1A and 1B is caught by the second and third sandwiching rollers 53B and 53C. Then, as shown in FIG. 11B, a substantially Z-shaped folded portion 2B is formed. The folding portion 2B folded in this way is guided into the third folding guide body 52 which is arranged so as to face the front side in the rotational feed direction of the second and third sandwiching rollers 53B and 53C. The 3-fold guide 52 is attached to the bag paper 1A by the cam 57A,
In synchronism with the sheet feeding of 1B, the sheet moves in parallel to the side of the fourth sandwiching roller 53D and stops at a position in close contact with the fourth sandwiching roller 53D. Simultaneously with this, the paper pressing roller 66 descends by the cam 58B and sandwiches the bag papers 1A and 1B, and the third nipping roller.
Hit 53C. For this reason, the looseness of the bag papers 1A and 1B caused by the paper feed is caused by the third and fourth nipping rollers 53.
C and 53D, the third and fourth nipping rollers 53C and 53D rotate to feed the bag sheets 1A and 1B downward while biting the looseness of the bag sheets 1A and 1B.
As shown in FIG. 11 (C), a substantially M-shaped folding section 2 is formed on one side of the bag sheets 1A and 1B. In the folding operation of the bag sheets 1A and 1B, the bag sheet 1A is first folded by the folding machine 11A, and after a predetermined time elapses, the bag sheet 1B is folded by the folding machine 11B.

Then, the third and fourth sandwiching rollers 53
The bag paper 1A delivered by the rotation of C and 53D is supplied to the paper delivery device 12A. The bag paper 1A delivered to the paper feeder 12A is first guided to the clamp member 76 by the guide plate 85 having the folding portion 2 at the tip thereof arranged below the third and fourth nipping rollers 53C and 53D. At this time, the clamp member 76 is held in a state where the engaging roller 78 provided on the upper surface of the clamp member 76 abuts against the U-shaped receiving portion 77 and is opened, and the bag sheet 1A guided by the guide plate 85.
Into the clamp member 76. Then, the slide body 74 moves along the cam plate 71 by the rotation of the eccentric cam 84, and the roller 75 attached to the slide body 74 moves from the inclined portion 73B to the flat portion 73A as the slide body 74 moves. Since the engaging roller 78 disengages from the receiving portion 77 and the clamp member 76 is closed by a spring (not shown), the clamp member 76 holds the folding portion 2 of the bag sheet 1A, and in this state, the slide body 74 is moved to move the bag. Pull out the paper 1A and rail 13
Put on. The bag paper 1A thus guided on the rails 13 is sent out to the folding machine 11B side by the conveying device 16 and is fed to both sides of the bag paper 1A by the gluing device 17 provided at substantially the center of the folding machines 11A and 11B. The edge (one side is the margin 2A) is glued. Then, the glued bag paper 1A is sent to the rail 14 on the side of the paper reversing / feeding device 12B by the carrying device 16.

On the other hand, the bag paper 1B pulled out by the paper reversing feed device 12B is guided by the reversing lever 15 in the direction opposite to the direction of the paper feeding device 12A, and slides.
With the clamp member 76 that moves in unison with the slide body 74 by the movement of the slide body 74, the bag sheet 1A is pulled out so as to be turned over with the folded portion 2 held, and the reversing lever 15 is the moving direction of the clamp member 76. It swings in the opposite direction, the tip of the reversing lever 15 is located outside the rail 14, and the bag paper 1B pulled out by the clamp member 76 is made to stand by while floating on the rail 14. In such a state, the above-described bag paper 1A is made to sneak under the bag paper 1B which is made to stand by while being floated on the rail 14 by the transport device 16, and the bag papers 1A and 1B are vertically stacked.

Then, the overlapped bag sheets 1A and 1B on the rail 14 are hooked by the feed claws 92 of the conveying device 16 to form the bag sheet 1
A and the bag paper 1B are simultaneously conveyed to the press device 17 in a state where they overlap each other. Then, the pouch papers 1A and 1B are pressed by the pressing device 17, and as shown in FIG.
A paper cylinder 3 having M-shaped folding portions 2 on both sides for a paper bag is molded.

As described above, according to the present invention, the two bags 1
The paper width of the bag papers 1A and 1B is half that of the conventional paper tube 3 that is formed by folding two long sheets of paper by forming a paper tube 3 for a paper bag by bonding A and 1B together. Therefore, even when the paper cylinder 3 for a large paper bag having a large bag width is molded, the paper width of the bag papers 1A and 1B can be suppressed within the range of a general sheet-fed printing press size. Since the printed paper bag 1A, 1B can be used to automatically and continuously form the paper cylinder 3 for a large paper bag having excellent decorativeness, conventionally, the manual operation of the paper cylinder 3 is automated. However, the manufacturing cost can be significantly reduced.

Further, when the paper tube 3 is formed from the two bag papers 1A and 1B, the bag papers 1A and 1B can be accurately bonded to the paper tube 3 by bonding them with their mutual positions aligned. In the present invention, the bag papers 1A and 1B are placed on the rails 13 and 14 formed on the same line, and the bag papers 1A and 1B are hooked on the feed claws 92 to the pressing device 17. By conveying, the bag papers 1A, 1B can be pasted in a state where the front, back, left, and right positions are aligned, and the bag papers 1A, 1B can be pasted accurately without shifting the position in the front, back, left, and right. .

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention. For example,
Although an example in which the pre-cut bag paper is sent out by the paper supply device is shown, roll paper may be sent out by the paper supply device and cut into a predetermined shape by a cutter device before the folding machine. In addition, the configuration of the paper supply device, the transport device, the press device, etc. may be set as appropriate, and further, an example in which an emulsion-based or hot-melt adhesive is sprayed on the bag paper as the gluing device and glued is shown. Alternatively, the adhesive may be sandwiched between the bags with the gluing roller and glued.

[0031]

According to the present invention, two paper feeding devices for feeding bag paper are provided side by side, and the leading edge portion of the bag paper is folded into each of the paper feeding devices in a substantially M-shape to form a folding portion. Folding machines to be formed are respectively connected in series, and rails for supporting the bag paper having the folding part are provided at the lower part of these folding machines, and the folding machine is fed between the one folding machine and the rail. A paper feed device for pulling out the bag paper and guiding the folded portion of the bag paper toward the front side toward the rail is provided, and the bag paper sent out from the folding machine between the other folding machine and the rail. Has a reversing mechanism that guides the leading edge side of the paper feeding device in the direction opposite to the feeding direction of the paper feeding device, and waits on the rail for bag paper fed through this reversing mechanism with its folding part facing the back side. It is equipped with a paper reversing feeder
Further, below the rails, there is provided a transport device for stacking and transporting the bag paper on the rails vertically, and a gluing device for gluing to both side edges of the bag paper delivered from the paper feeding device is provided in the transport device. A side-by-side transporting device was equipped with a press device that sandwiches and stacks the vertically stacked bag sheets so that the bag sheets can be printed by a general sheet-fed printing machine. It is possible to provide a bag making machine for a paper bag paper cylinder capable of molding a large paper bag having a large width.

[Brief description of drawings]

FIG. 1 is a schematic front view of a bag making machine showing an embodiment of the present invention.

FIG. 2 is a schematic side view of the bag making machine.

FIG. 3 is a schematic plan view of the bag making machine.

FIG. 4 is a front view showing the paper feeding device.

FIG. 5 is a front view showing an outline of the folding machine.

FIG. 6 is a front view showing a first folding guide plate of the folding machine.

FIG. 7 is a front view showing a second folding guide plate of the folding machine.

FIG. 8 is a front view showing a third folding guide plate of the folding machine.

FIG. 9 is a front view showing the paper feeding device.

FIG. 10 is a front view showing the paper reverse feeding device.

FIG. 11 is a perspective view showing a folded state of the same bag sheet.

FIG. 12 is a perspective view of an essential part showing a state in which the same bag sheet is supported by rails.

FIG. 13 is a perspective view of the completed paper tube.

FIG. 14 is a perspective view showing a conventional method for molding a paper tube.

[Explanation of symbols]

 1A, 1B Bag paper 10A, 10B Paper feeding device 11A, 11B Folding machine 12A Paper feeding device 12B Paper reversing feeding device 13, 14 Rail 15 Reversing lever (reversing mechanism) 16 Conveying device 17 Gluing device 18 Pressing device

Claims (1)

[Claims] 1. Two paper feeding devices for feeding bag paper are arranged side by side, and the leading edge portion of the bag paper is approximately M in each of these paper feeding devices.
Folding machines that are folded in a letter shape to form folding parts are respectively provided in series, and rails that support the bag paper having the folding parts are provided at the bottom of these folding machines, and one of the folding machines and the rails are provided. Between the folding machine and the rail, a paper feeding device that pulls out the bag paper fed from the folding machine and guides the folding part of the bag paper toward the rail is provided between the other folding machine and the rail. It has a reversing mechanism that guides the front end side of the bag paper sent out from the folding machine in the direction opposite to the feeding direction of the paper feeding device, and the bag paper sent through this reversing mechanism has its folding part on the back side. Is provided on the rail, and a transport device for transporting the bag sheets on the rail in a vertically stacked manner is provided below the rail and is fed from the paper transporting device. Bag of paper A gluing device for gluing on the side edge is provided in parallel with the conveying device, and a press device for sandwiching and stacking vertically stacked bag sheets is provided on the end side of the conveying device. Bag making machine.