JPWO2019043760A1 - Bag making machine - Google Patents

Abstract

The piece (103) is folded back inward so that the piece (103) is aligned with the surface of the rear surface portion (102) on the transport surface (200), and glue is applied to the first folded portion and the surface of the folded piece (103). The glue application part (5) and the front face part (101) are folded back to the front face part while aligning them with the surfaces of the rear face part (102) and the folded back piece part (103). A second folding part (6) for joining both edges of the (101) to the one part (103), and the second folding part (6) is the one part folded back at the first folding part. (103) is configured to be transported only along a transport surface (200) that is flush with the transport surface (200) of the first folding section.

Description

TECHNICAL FIELD The present invention relates to a bag-making machine for producing a Western-style envelope.

A general form of "Western envelope" has a horizontally long rectangle and has a seal formed on the long side. When manufacturing a Western-style envelope, for example, as shown in FIG. 23, glue is applied to the folded piece portions 103 on both sides of the rear surface portion 102 of the paper 100, and the front surface portion 101 is folded back to form the piece portion 103. It is crimped to.

Patent No. 4341504 Japanese Patent Laid-Open No. 1-133867 Japanese Utility Model Publication No. 3-33730 Patent No. 3401237

However, conventionally, when the front surface portion 101 is pressure-bonded to the piece portion 103, the piece portion 103 is bent along a press roller (not shown). Therefore, as shown in FIG. 24, wrinkles 109 were formed at the fold line 1031 of the piece 103. Therefore, the obtained Western envelope had a bad appearance.

An object of the present invention is to provide a bag-making machine capable of producing a Western envelope having a good appearance.

The present invention provides a Western-style envelope by processing a flat sheet consisting of a front surface portion, a rear surface portion, and glue substitute pieces protruding on both sides of the rear surface portion while being conveyed along a conveyance surface. A bag-making machine that produces
A first folding part, which is folded back inward so that the piece part is aligned with the surface of the rear surface part on the transport surface;
A glue applying portion for applying glue to the surface of the folded back portion,
A second folding, in which the front surface portion is folded back to match the surfaces of the rear surface portion and the folded back piece portion, and both edges of the front surface portion are joined to the piece portion. Department,
Is equipped with
The second folding section is configured to convey the piece section folded back at the first folding section only along a conveyance surface that forms the same plane as the conveyance surface of the first folding section. ing,
It is characterized by

According to the bag making machine of the present invention, since the folded back portion is transported along the second folding portion only along the transportation surface forming the same plane as the transportation surface of the first folding portion, it is folded back. It is possible to eliminate the bending of the piece at the second folding portion. Therefore, it is possible to prevent wrinkles from being formed on the folded back portion, and as a result, it is possible to obtain a beautiful Western envelope.

It is the perspective view which looked at the bag making machine of one embodiment of the present invention from the upper part and the upper part of the conveyance direction. It is the perspective view which looked at the bag-making machine of FIG. It is sectional drawing of the bag-making machine of FIG. It is a top view which shows the initial state of the paper processed by the bag-making machine of FIG. It is a top view which shows the state by which the paper of FIG. 4 was folded. It is a top view which shows the state by which the paper of FIG. 5 was folded. It is a perspective view of the right side folding device of a 1st folding part. FIG. 8 is a schematic view taken along arrow VIII of FIG. 7, showing a state before folding back. FIG. 8 is a perspective view of the inside of the folding device of FIG. 7 viewed from the opposite side of FIG. 7. It is a principal part expanded perspective view of the rotation mechanism of the flap board of a folding device. FIG. 11 is a sectional view taken along line XI-XI in FIG. 10. FIG. 9 is a diagram corresponding to FIG. 8, showing a state after being folded back. It is a perspective view of the application device on the right side of the glue application unit. It is the perspective view which looked at the 2nd folding part from the upper direction and the upper part of the conveyance direction. It is a perspective view showing the 2nd folding part in which illustration of a drive mechanism was omitted. FIG. 16 is a view on arrow XVI of FIG. 15, showing a state in which the switching gate plate is in the guide position. FIG. 17 is a diagram corresponding to FIG. 16, showing a state in which the switching gate plate is in the retracted position. FIG. 7 is a perspective view showing a second folding section in which a drive mechanism and a pair of conveyance rollers are not shown. It is a side view which shows the pair of conveyance rollers arrange|positioned near the 2nd folding part. It is a figure which shows the mode of processing of the paper in a 2nd folding part. It is a figure which shows the mode of the processing of the paper following FIG. FIG. 22 is a diagram showing a manner of processing the paper following FIG. 21. It is a perspective view showing the state in the middle of manufacture of a Western-style envelope. It is a perspective partial view which shows the malfunction of the Western-style envelope produced with the conventional bag-making machine.

1 to 3 show a bag making machine 10 according to an embodiment of the present invention. FIG. 1 is a perspective view of the bag making machine 10 as seen from the upstream side and the upper side in the transport direction. FIG. 2 is a perspective view of the bag making machine 10 viewed from the downstream side and the upper side in the transport direction. FIG. 3 is a cross-sectional view of the bag making machine 10. The bag making machine 10 includes a paper feeding unit 1, a first crease processing unit 2, a first folding unit 3, a second crease processing unit 4, a glue applying unit 5, a second folding unit 6, and the The paper discharge unit 7 is provided in the apparatus body 10A. The glue applying section 5 has a glue tank 50.

The bag-making machine 10 is adapted to manufacture the Western-style envelope 90 by processing the flat sheet 100 shown in FIG. 4 while conveying it, as shown in FIGS. 5 and 6. The sheet 100 includes a front surface portion 101, a rear surface portion 102, and glue substitute pieces 103 protruding on both sides of the rear surface portion 102. As shown in FIG. 5, the sheet 100 is folded at a first fold line 111 which is a boundary line between the rear surface portion 102 and the piece portion 103, and further, as shown in FIG. 6, the front surface portion 101. The second fold 112, which is a boundary line between the rear surface portion 102 and the rear surface portion 102, is adapted to be folded. Adhesive is applied to the surface of the piece 103 folded back at the first fold 111. Then, both edge portions of the front surface portion 101 folded back at the second fold 112 are joined to the piece portion 103. The first fold line 111 is along the transport direction. The second fold line 112 extends along a direction orthogonal to the transport direction (that is, the width direction).

[Paper feeder 1]
The paper feed unit 1 includes a paper feed tray 11 that is inclined and a transport roller 12. The transport roller 12 is configured to feed the sheets 100 placed on the paper feed tray 11 one by one to the downstream side in the transport direction.

The bag making machine 10 is provided with four transport roller pairs 81, 82, 83, 84 in addition to the transport roller 12. The four conveying roller pairs form a conveying surface 200 on which the sheet is conveyed, and the conveying surface 200 is flush with the conveying roller 12 to the conveying roller pair 84.

[First crease processing part 2]
The first crease processing unit 2 is adapted to form creases on the first fold line 111 (FIG. 4) of the sheet 100. As the first crease processing unit 2, a known mechanism can be adopted.

[First folding part 3]
The first folding section 3 is composed of a pair of folding devices 3A and 3B which are arranged to face each other in the width direction. FIG. 7 shows the folding device 3A arranged on the right side, and is a perspective view of the device 3A as seen from the upstream side and the upper side in the transport direction. The device 3A and the device 3B have a bilaterally symmetrical configuration.

As shown in FIG. 7, the folding device 3A has a flap plate 32 that rotates around a shaft 31 along the transport direction. The flap plate 32 is provided so as to rotate 180 degrees on a horizontal plane, as shown in FIG. 8 which is a schematic view of the arrow VIII of FIG. 7. FIG. 9 is a perspective view of the inside of the device 3A as viewed from the opposite side of FIG. 7, and shows the rotating mechanism 300 of the flap plate 32.

The rotation mechanism 300 includes a motor 301, a first pulley 302, a transmission belt 303, a second pulley 304, a rotation gear 305, a swing gear 306, a slide shaft 307, and a slide receiving portion 308. Have The transmission belt 303 is stretched around the first pulley 302 and the second pulley 304. The second pulley 304 and the rotary gear 305 are supported by the rotary shaft 311. The swing gear 306 is supported by the shaft 312. FIG. 10 is an enlarged perspective view of a main part of the rotating mechanism 300. The slide shaft 307 projects to the left and right sides at the upper end of the swing gear 306. The slide receiving portion 308 receives the slide shaft 307 in the slide groove 3081. The slide groove 3081 is parallel to the flap plate 32. 11 is a sectional view taken along line XI-XI of FIG. The rotating mechanism 300 operates as follows. That is, when the motor 301 operates, the rotary gear 305 rotates via the first pulley 302, the transmission belt 303, and the second pulley 304. When the rotary gear 305 rotates, the swing gear 306 swings and the flap plate 32 rotates. That is, as shown in FIG. 11, when the rotary gear 305 rotates in the R1 direction, the swing gear 306 swings in the R3 direction, the slide shaft 307 moves in the slide receiving portion 308, and as a result, the flap plate is moved. 32 rotates in the R5 direction. Conversely, when the rotary gear 305 rotates in the R2 direction, the swing gear 306 swings in the R4 direction, the slide shaft 307 moves in the slide receiving portion 308, and as a result, the flap plate 32 rotates in the R6 direction. To do. Therefore, according to the rotating mechanism 300, the flap plate 32 can be rotated 180 degrees on the horizontal plane, as shown in FIG. As a result, according to the folding device 3A, as shown in FIG. 12, the piece 103 of the sheet 100 placed on the flap plate 32 positioned outside in the width direction is moved in the R5 direction by the flap plate 32. It can be folded back inward so as to be aligned with the surface of the rear surface portion 102 by rotating the front surface.

[Second crease processing part 4]
The second crease processing unit 4 forms creases on the second fold line 112 (FIG. 5) of the sheet 100. As the second crease processing section 4, a known mechanism can be adopted.

[Glue application part 5]
The glue applying section 5 is composed of a pair of applying devices 5A and 5B which are arranged to face each other in the width direction. FIG. 13 shows the coating device 5A arranged on the right side, and is a perspective view of the device 5A as seen from upstream and above in the transport direction. The device 5A and the device 5B have a bilaterally symmetrical configuration.

The coating device 5A has a nozzle portion 51, a position setting mechanism 52, and a vertical drive mechanism 53.

(A) The nozzle portion 51 can apply glue. Specifically, the nozzle portion 51 has a nozzle 511, a main body 512, and a connecting portion 513. The nozzle 511 is provided at the lower end of the main body 512, and the connecting portion 513 is provided at the upper end of the main body 512. The vertical position of the nozzle 511 with respect to the main body 512 can be adjusted by screws 514 and 515. A tube 501 (FIG. 1) connected to the glue tank 50 is connected to the connecting portion 513.

(B) The position setting mechanism 52 can adjust the position of the nozzle portion 51 in the width direction. Specifically, the position setting mechanism 52 has a side wall portion 521 and an upper wall portion 522. The side wall portion 521 has two through holes 5211 and 5212 arranged vertically. The slide shaft 523 (FIG. 2) penetrates the upper through hole 5211, and the slide shaft 524 (FIG. 2) penetrates the lower through hole 5212. The slide shafts 523 and 524 extend in the width direction of the device body 10A. The upper wall portion 522 has two screws 5221 and 5222 for screwing to the upper slide shaft 523. The position setting mechanism 52 manually moves the device 5A, that is, the nozzle portion 51 along the slide shafts 523 and 524 penetrating the side wall portion 521, and fixes the device 5A by screws 5221 and 5222 of the upper wall portion 522. Thereby, the device 5A, that is, the nozzle portion 51 can be fixed at a desired position in the width direction.

(C) The vertical drive mechanism 53 can move the nozzle portion 51 up and down. Specifically, the up-and-down drive mechanism 53 operates as follows. That is, when the motor 531 operates, the vertical shaft 535 rotates via the three gears 532, 533, 534. Since the spiral wire 536 is fitted onto the vertical shaft 535, when the vertical shaft 535 rotates, the wire 536 also rotates. On the other hand, since the main body 512 of the nozzle unit 5 is constantly urged downward by the spring 538 provided on the vertical shaft 537, the convex portion 539 protruding from the side surface of the main body 512 is upwardly moved to the line body 536. Abutted against. Therefore, when the line body 536 rotates, the convex portion 539 moves up and down along the line body 536, that is, the nozzle portion 51 moves up and down.

[Second folding part 6]
FIG. 14 is a perspective view of the second folding section 6 seen from the upstream side and the upper side in the transport direction. The second folding section 6 includes a conveying roller pair 83, a press roller pair 61, a switchback guide plate 62, and a switching gate plate 63. The switching gate plate 63 is connected to the drive mechanism 64. FIG. 15 is a perspective view showing the second folding portion 6 in which the drive mechanism 64 is omitted. FIG. 16 is a view on arrow XVI of FIG.

(A) The pair of transport rollers 83 is located upstream of the switchback guide plate 62 and the switching gate plate 63 in the transport direction and downstream of the glue applying unit 5 in the transport direction. The length of the upper roller 831 in the width direction is shorter than the length of the lower roller 832 in the width direction, and the upper roller 831 does not come into contact with the folded piece 103 of the sheet 100 being conveyed.

(B) The press roller pair 61 is located downstream of the entrance of the switchback guide plate 62 and the switching gate plate 63 in the transport direction. The transport surface 200 including the transport roller pair 83 and the press roller pair 61 is flush with each other.

(C) The switchback guide plate 62 is inclined from the transport surface 200 toward the upper side and toward the downstream side in the transport direction. The guide plate 62 is configured by stacking two plates 621 and 622 with a gap therebetween. The gap is a gap into which one sheet of paper 100 is inserted. Further, the guide plate 62 is provided with a stopper 623 with which the front surface portion 101 of the sheet 100 inserted into the gap abuts. The stopper 623 is provided along the long hole 6211 of the upper plate 621 so that it can be fixed at any position within a predetermined distance. The distance L1 (FIG. 22) from the nip portion 610 of the press roller pair 61 to the stopper 623 is set to be the same as the conveyance direction length X1 (FIG. 5) of the front surface portion 101 of the paper 100. The upstream portion 6221 of the lower plate 622 is curved along the circumferential surface of the upper roller 611 of the press roller pair 61.

(D) The switching gate plate 63 is arranged at the entrance of the switchback guide plate 62, and is configured to rotate around the support shaft 631. When the switching gate plate 63 is rotated around the support shaft 631, as shown in FIG. 16, the switching gate plate 63 interferes with the conveyed paper 100 and guides the paper 100 to the guide plate 62. As shown in 17, it is possible to switch between a retracted position that does not interfere with the conveyed paper 100. FIG. 18 is a perspective view showing the second folding section 6 in which the drive mechanism 64 and the conveyance roller pair 83 are not shown. As shown in FIG. 18, the switching gate plate 63 has substantially the same width direction length as the guide plate 62. The drive mechanism 64 (FIG. 14) operates as follows. That is, when the motor 641 operates, the second pulley 644 rotates via the first pulley 642 and the transmission belt 643. Since the support shaft 631 is connected to the second pulley 644, when the second pulley 644 rotates, the switching gate plate 63 rotates.

[Paper discharge section 7]
The paper discharge unit 7 has a pair of transport rollers 84 and a paper discharge tray 71. The transport roller pair 84 is provided so as to operate as a discharge roller. Specifically, as shown in FIG. 19, the transport roller pair 84 is arranged near the press roller pair 61 of the second folding section 6 and downstream in the transport direction. The paper discharge tray 71 is inclined from a position below the transport surface 200, obliquely upward and downstream in the transport direction.

Next, the operation of the bag making machine 10 having the above configuration will be described.

First, the paper 100 shown in FIG. 4 is placed on the paper feed tray 11. At this time, the front surface portion 101 is located on the downstream side in the transport direction. Then, a switch (not shown) is turned on to start the operation.

(1) The paper 100 on the paper feed tray 11 is sent to the downstream in the carrying direction by the carrying roller 12 and passes through the first crease processing unit 2. At that time, the first crease processing unit 2 operates to form creases on the first fold line 111 of the sheet 100. As a result, the piece 103 is easily folded back inward.

(2) The sheet 100 on which the crease is formed stops at the first folding section 3. At this time, the flap plates 32 of both the devices 3A and 3B of the first folding section 3 are positioned on the outer side in the width direction, and the pieces 103 on both sides of the sheet 100 are placed on the flap plate 32. Next, the rotation mechanism 300 operates to rotate the flap plate 32 inward, whereby the piece 103 is folded back inward at the first fold 111 and is fitted to the surface of the rear surface portion 102. After that, the flap plate 32 rotates outward. Then, the pair of conveying rollers 81 conveys the sheet 100 whose one side 103 is folded back to the downstream side in the conveying direction. The flap plate 32 rotated outward is maintained in that state until the next sheet 100 arrives. It should be noted that, with the flap plate 32 rotated inward, the sheet 100 with the piece 103 folded back is conveyed downstream in the conveying direction, and the flap plate 32 is rotated outward before the next sheet 100 is conveyed. It may be activated to move.

(3) The sheet 100 conveyed by the pair of conveying rollers 81 stops at the second crease processing unit 4. At this time, the second fold 112 of the sheet 100 is located immediately below the crease blade of the second crease processing unit 4. Then, the second crease processing section 4 operates to form creases at the second fold line 112. As a result, the front surface portion 101 is easily folded back toward the upstream side in the transport direction.

(4) The sheet 100 having the creases formed on the second fold line 112 is transported downstream in the transport direction by the transport roller pair 82 and passes through the glue applying section 5. In the glue applying section 5, when the folded piece 103 starts to pass, the nozzles 51 of both devices 5A and 5B move downward, and the nozzle 511 abuts on the surface of the piece 103, so that the piece When the passage of 103 is completed, the nozzle portion 51 moves upward, and the nozzle 511 moves away from the surface of the piece portion 103. As a result, glue is applied to the surface of the folded back piece 103. The folded back piece 103 passes through the nozzle 511 in a state of being pressed or after being pressed by the pair of conveying rollers 82 located upstream of the nozzle 511 in the conveying direction. Therefore, the glue application work by the nozzle 511 can be stably performed.

(5) The sheet 100 with the adhesive applied to the piece 103 is conveyed to the second folding section 6 by the pair of conveying rollers 83. At this time, the switching gate plate 63 is set at the interference position (FIG. 16). Therefore, as shown in FIG. 20, the sheet 100 is guided to the guide plate 62 by the switching gate plate 63, is inserted into the gap of the guide plate 62, and hits the stopper 623. Since the distance L1 (FIG. 22) from the nip portion 610 of the press roller pair 61 to the stopper 623 is set to be the same as the conveyance direction length X1 (FIG. 5) of the front surface portion 101, the sheet 100 is stopped by the stopper. The rear surface portion 102 at the time of abutting 623 is located on the transport surface 200, that is, the folded back portion 103 is located on the transport surface 200 that is a flat surface.

Since the upper roller 831 of the pair of conveying rollers 83 is set to have a width dimension that does not contact the surface of the piece 103, the adhesive applied to the piece 103 does not adhere to the pair of conveying rollers 83.

(6) The sheet 100 that hits the stopper 623 tries to be further transported downstream in the transport direction by the transport roller pair 83. As a result, as shown in FIG. 21, the sheet 100 is bent at the second fold 112, and the bent portion, that is, the second fold 112, is sandwiched by the nip 610 of the press roller pair 61, and the downstream side is reached. Will be transported to. Then, as shown in FIG. 22, the entire front surface portion 101 is folded back and fitted to the surface of the rear surface portion 102, and at this time, both edges of the front surface portion 101 are joined to the piece portion 103. Thereby, a Western-style envelope is obtained.

The nozzle 511 of the glue applying section 5 is arranged at a position at a distance L2 from the nip portion 610 of the press roller pair 61, and the distance L2 is set shorter than the length X2 (FIG. 5) of the piece 103 in the transport direction. There is. Therefore, the folded back portion 103 enters the nip portion 610 in a state in which the nozzle 511 suppresses the floating, that is, in a stable state.

Further, even when the sheet 100 is folded back as shown in FIGS. 21 and 22, the rear surface portion 102, that is, the folded back piece portion 103 is conveyed on the conveyance surface 200 which is a flat surface.

According to the bag making machine 10 having the above configuration, the following effects can be exhibited.

(A) In the second folding section 6, until the sheet 100 hits the stopper 623, and until after the sheet 100 hits, the entire front surface portion 101 is folded back and fitted to the surface of the rear surface portion 102. Meanwhile, the folded back piece 103 can be transported only along the transport surface 200 that is flush with the transport surface 200 of the first folding portion 3. That is, it is possible to eliminate the bending of the folded back piece portion 103 in the second folding portion 6. Therefore, it is possible to prevent the formation of wrinkles 109 as shown in FIG. 24, and as a result, it is possible to obtain a Western envelope 90 having a good appearance.

(B) Since the distance L2 from the nip portion 610 of the press roller pair 61 to the nozzle 511 of the glue application unit 5 is set to be shorter than the length X2 of the piece 103 in the transport direction, the work performed by the glue application unit 5 and the first The work by the two-folding section 6 can be executed substantially at the same time. Therefore, the length of the bag making machine 10 in the carrying direction can be shortened to achieve miniaturization, and the workability of the bag making machine 10 can be improved.

(C) Since the first crease processing section 2 forms creases in the first fold line 111, the folding processing by the first fold section 3 can be smoothly performed.

(D) Since the piece 103 is folded back by rotating the flap plate 32 of the first folding section 3, the piece 103 can be folded back reliably in a short time in a reliable and uniform manner.

(E) Since the second crease portion 4 forms creases in the second fold line 112, the fold processing by the second fold portion 6 can be smoothly performed.

The bag making machine 10 of the present invention may optionally adopt one or more of the following modified configurations.

(1) The first crease processed portion 2 and/or the second crease processed portion 4 are not essential.

(2) The first folding section 3 has a structure other than the structure for rotating the flap plate 32.

(3) The glue applying section 5 is located not far from the second folding section 6 but at a great distance from the second folding section 6.

The Western envelope that can be manufactured by the bag making machine of the present invention is not limited to a Western envelope of a general form, but can be formed by folding back the front surface portion 101 and adhering it to the folded back portion 102 of the rear surface portion 102. Such envelopes are included as long as they are shaped envelopes.

Since the bag-making machine of the present invention can produce a Western envelope having a good appearance, it has a great industrial utility value.

1 Bag-making machine 2 1st crease processing part 3 1st folding part 31 Shaft 32 Flap plate 4 2nd crease processing part 5 Glue application part 6 2nd folding part 61 Press roller pair 62 Switchback guide plate 63 Switching gate plate 83 Transfer Roller pair 90 Western-style envelope 100 Paper 101 Front side 102 Back side 103 Single side 200 Transport side

Claims (6)

A Western-style envelope is manufactured by processing a flat sheet consisting of a front surface portion, a rear surface portion, and glue substitute pieces protruding on both sides of the rear surface portion while being conveyed along a conveying surface. A bag machine,
A first folding part, which is folded back inward so that the piece part is aligned with the surface of the rear surface part on the transport surface;
A glue applying portion for applying glue to the surface of the folded back portion,
A second folding, in which the front surface portion is folded back to match the surfaces of the rear surface portion and the folded back piece portion, and both edges of the front surface portion are joined to the piece portion. Department,
Is equipped with
The second folding section is configured to convey the piece section folded back at the first folding section only along a conveyance surface that forms the same plane as the conveyance surface of the first folding section. ing,
A bag-making machine characterized by that. The second folding section includes a pair of transport rollers arranged on the upstream side in the transport direction, a pair of press rollers arranged on the downstream side in the transport direction, and a switch extending obliquely above and downstream from the pair of rollers in the transport direction. A back guide plate and a switching gate plate arranged at the entrance of the switch back guide plate,
The switchback guide plate is configured such that the front surface portion of the sheet conveyed by the pair of conveying rollers is inserted and abutted.
The pair of transport rollers is configured to further transport the rear surface portion of the sheet with the front surface portion abutting,
The press roller pair sandwiches and conveys the bending portion generated at the boundary between the front surface portion and the rear surface portion by further conveying the rear surface portion, and thereby conveys the front surface portion. It is designed to fold back,
The switching gate plate is adapted to be switched between a guide position for interfering with the sheet and guiding the sheet to the switchback guide plate, and a retracted position for not interfering with the sheet,
In the second folding section, when the flexible section is sandwiched between the press roller pair, the piece section folded back by the first folding section is located on the transport surface upstream of the press roller pair in the transport direction. Is configured to be located,
The bag making machine according to claim 1. The glue applying section is located upstream of the carrying roller pair in the carrying direction, and is attached to the press roller pair in a state where the piece folded back at the first folding section is prevented from being lifted up by the glue applying section. It is placed at the position where it is sandwiched,
The bag making machine according to claim 2. Furthermore, a first crease processing section is provided on the upstream side in the transport direction of the first folding section,
The first crease processing section is configured to form creases at a first fold for folding back the piece.
The bag making machine according to claim 1. Furthermore, a second crease processing section is provided on the upstream side of the second folding section in the transport direction,
The second crease processing portion is configured to form crease at a second fold for folding back the front surface portion.
The bag making machine according to any one of claims 1 to 4. The first folding portion has a flap plate that rotates around an axis extending along the transport direction, and by rotating the flap plate by abutting the flap plate from below, It is designed to fold the one part,
The bag making machine according to claim 1.

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