JP2022162739A - Paper folder - Google Patents

Abstract

To prevent generation of folding displacement, and to secure accuracy at a folding position when bending a piece part, even when a fold at the piece part of a paper sheet is firmly formed and edge forms at an intersection part between the fold and an outer frame of the piece part are different from each other between on an upper stream side and on a lower stream side of conveyance of the paper sheet, and/or even when using a thin paper sheet for the paper sheet.SOLUTION: Folding means comprises: a pair of upper and lower guide plates constituting part of a paper sheet conveying passage at a folding processing position; and angle adjustment means for adjusting a relative angle between an end face of the upper guide plate and a fold formed when fold-processing a folding part of a paper sheet.SELECTED DRAWING: Figure 15

Description

The present invention relates to a paper folding device. More specifically, the present invention relates to a paper folding device provided in a bag making machine for making envelopes, a sealing device, or the like.

Conventionally, in a sealing device (for example, Patent Document 1) provided with a paper folding device that folds a flap while moving the envelope along a predetermined conveying path, the envelope with the adhesive film attached is pushed by the flap pressing mechanism (folding mechanism). device), where the folding plate rotates to fold the flap and press the flap against the envelope body, thereby adhering the flap to the envelope body.

JP-A-9-240628

However, in the paper folding device in the sealing device described in Patent Document 1, when folding the paper, depending on the conditions such as the type and size of the paper to be folded, after the folding, the folding position is changed to the next stage. The sheet is not stably transported to the pressing position where the pressing roller presses the fold line. As a result, it is conceivable that the folding position may be misaligned at the pressed position, resulting in problems such as a lack of accuracy in the folding line position.

Therefore, the applicant of the present application proposed a new invention as shown in FIGS. proposes a bag-making machine equipped with a paper folding device with the following structure.

In this bag making machine, as shown in FIG. 5(a), a first folding device 3a as a paper folding device has a folding plate 32 rotating around a rotating shaft 31 along the conveying direction. Further, an upper guide plate 36 is provided with a predetermined gap (about 0.5 mm) above the lower guide plate 33, and a pair of conveying rollers ( It has a driving roller 38 and a driven roller 35). Note that the upper guide plate 36 and the lower guide plate 33 are formed with notches at the nip portion of the conveying roller pair.

In the paper folding device, when folding the piece portion 103 (corresponding to the flap) as the folding portion of the paper 100, the folding plate is positioned on the outer side in the width direction as shown in FIG. 5(a). By rotating the folding plate 32 in the R5 direction as shown in FIG. It can be folded inward so as to be superimposed on the surface of the rear surface portion 102 as the upper guide plate 36 via the upper guide plate 36 .

After that, in FIG. 5(d), the folding plate 32 rotates in a direction R6 away from the lower guide plate 33. As shown in FIG. Then, the pair of conveying rollers (the driving roller 38 and the driven roller 35) conveys the sheet 100 with the folded portion 103 downstream in the conveying direction. By rotating the folding plate 32 by at least a predetermined angle in the direction R6 away from the lower guide plate 33 before starting to convey the paper 100, the folded paper 100 can be folded between the folding plate 32 and the upper and lower pair. Without being interfered by the guide plates 36 and 33, the sheet can be smoothly conveyed toward the downstream side of the folding position in the sheet conveying direction.

According to the above, the piece 103 of the paper 100 is folded back onto the upper surface of the upper guide plate 36 while the rear surface 102 of the paper 100 is held between the pair of upper and lower guide plates (36, 33). It is possible to prevent wrinkles from occurring in the crease portion of the paper 100 during processing, and to secure the accuracy of the crease position when the piece portion 103 is folded.

However, the inventors of the present application, while further advancing the research and development of the paper folding apparatus, discovered a new problem with the paper folding apparatus having a new configuration proposed by the applicant of the present application. We have found that there is room for further improvement in performance.

That is, for example, as shown in FIG. 19, the edge shape at the intersection of the outer frame of the piece 103 and the first fold line 111 is the upstream side of the paper 100 (B section; 1031) and the downstream side of the paper 100 (C section). 1032, 1033), when the piece 103 of the paper 100 is folded back onto the upper surface of the upper guide plate 36 from the first fold line 111 by the folding plate 32, the folding balance is lost and folding misalignment occurs. there's a possibility that. For example, even if creases are formed on the first crease 111 in advance, if thin paper is used as the paper 100, there is still a possibility that folding misalignment will occur.

The present invention has been made in view of such a newly discovered novel technical problem. To prevent folding misalignment even when the edge shape at the intersection with the fold line 111 is different between the upstream side of the paper 100 and the downstream side of the paper 100, or when thin paper is used for the paper 100, The purpose is to ensure the accuracy of the folding line position when folding the piece 103 .

In order to achieve the above object, the first aspect of the invention provides a paper folding device for folding a flat sheet of paper while conveying it along a paper conveying path, wherein the sheet of paper is fed from a main body and from the main body. It has an overhanging folded portion, is provided at a folding position for folding the folded portion of the paper in the paper transport path, and the folded portion of the paper is centered around a rotation shaft substantially parallel to the paper transport path. Folding means having a folding plate that reciprocates between a placement position where the sheet is placed and a stacking position where the folded portion of the sheet is stacked toward the main body,
The folding means includes a pair of upper and lower guide plates that constitute a part of the sheet conveying path at the folding position. The lower surface of the plate is configured to overlap the upper surface of the upper guide plate of the pair of upper and lower guide plates,
It is characterized by further comprising an angle adjusting means for adjusting a relative angle between the end surface of the upper guide plate and the crease when folding the folded portion of the sheet.

According to a second aspect of the present invention, there is provided the paper folding apparatus according to the first aspect, wherein the angle adjustment means is arranged in a horizontal direction around the rotation fulcrum of the upper guide plate and in a direction intersecting the paper conveying direction. and a screw mechanism for rotating the upper guide plate so that the angle can be adjusted.

The invention according to claim 3 is the paper folding device according to claim 1 or claim 2, wherein the angle adjustment means includes a lock mechanism for fixing the inclination angle of the upper guide plate during the angle adjustment. It is characterized by

According to a fourth aspect of the present invention, in the paper folding apparatus according to any one of the first to third aspects, the operator confirms the degree of misfolding of the paper after the folding process, and according to the degree, and a test paper feeding mode for adjusting the inclination angle of the upper guide plate by the angle adjusting means.

The invention according to claim 5 is the paper folding device according to any one of claims 1 to 4, wherein the folding means is configured to fold the main body of the paper at the folding position on the paper transport path. a pair of conveying rollers for guiding the to pass between the pair of upper and lower guide plates, and a control means for controlling the driving of the pair of conveying rollers,
When the folding means folds the folded portion of the sheet, the control means stops the driving of the pair of transport rollers at the folding position to stop the transport of the sheet. is held between the pair of conveying rollers, and the folded portion of the sheet is bent.

The invention according to claim 6 is the paper folding apparatus according to any one of claims 1 to 5, further comprising crease processing means on the upstream side of the folding position in the paper transport direction, wherein the crease The processing means is characterized in that creases are formed in advance on creases when the folded portion of the sheet is folded.

According to the first aspect of the invention, since the angle adjustment means is provided for adjusting the relative angle between the end face of the upper guide plate and the crease when folding the folded portion of the paper, the paper can be In addition, it is possible to secure the accuracy of the folding line position when folding the folded portion of the sheet.

According to the second aspect of the present invention, the angle adjusting means rotates the upper guide plate so that the angle can be adjusted in the horizontal direction and in the direction intersecting the paper conveying direction about the rotation fulcrum of the upper guide plate. Since it is composed of a moving screw mechanism, it is possible to prevent the occurrence of folding misalignment in the folded part of the paper with a simple and inexpensive structure, and to ensure the accuracy of the folded position when folding the folded part of the paper.

According to the third aspect of the invention, since the angle adjustment means has a lock mechanism for fixing the inclination angle of the upper guide plate during angle adjustment, it is possible to prevent the inclination angle of the upper guide plate from being displaced after the angle adjustment. can be done.

According to the fourth aspect of the present invention, the operator visually confirms the degree of misalignment of the sheet after folding, and adjusts the inclination angle of the upper guide plate by the angle adjusting means according to the degree of misalignment. Since the test paper feeding mode is provided, it is possible to prevent misfolding of the folded portion of the paper with a simple and inexpensive configuration, and to secure the accuracy of the folded position when folding the folded portion of the paper.

According to the fifth aspect of the present invention, when the folding means folds the folded portion of the sheet, the control means stops the transport of the sheet by stopping the driving of the pair of transport rollers at the folding position. In addition, since the folding portion of the paper is controlled to be folded while the main body of the paper is held between the pair of conveying rollers, it is possible to more reliably prevent the folding of the paper from being misaligned. , it is possible to secure the accuracy of the folding line position when folding the folded portion of the sheet.

According to the sixth aspect of the present invention, the crease processing means is provided on the upstream side of the folding position in the sheet conveying direction, and the crease processing means preliminarily creases the crease when folding the folded portion of the sheet. is formed, it is possible to more reliably prevent the occurrence of folding misalignment in the folded part of the paper, and to ensure the accuracy of the folded position when folding the folded part of the paper.

1 is a schematic overall configuration diagram of a bag making machine according to a first embodiment of the present invention; FIG. FIG. 2 is a plan view showing a state of paper processed by the bag making machine of FIG. 1; 3 is a plan view showing a state in which the sheet of FIG. 2 is folded; FIG. FIG. 3 is a perspective view showing a state in the middle of manufacturing a Western-style envelope; It is a figure which shows the state before and behind folding|folding a folding plate in a 1st folding part. It is a perspective view which shows the whole structure of a 1st folding part. It is a perspective view showing the configuration of the first folding device. It is a figure which shows the rotating mechanism of the folding plate of a 1st folding apparatus. It is a figure which shows the rotating mechanism of the folding plate of a 1st folding apparatus. FIG. 10 is a diagram showing how the paper is processed in the second folding section; FIG. 11 is a diagram showing how the paper is processed following FIG. 10; FIG. 12 is a diagram illustrating how the paper is processed following FIG. 11; FIG. 13 is a diagram illustrating how the paper is processed following FIG. 12; It is a perspective view showing the configuration of the first folding device. It is a perspective view which shows the structure of an angle adjustment means. FIG. 4 is a cross-sectional view showing the configuration of a screw mechanism in the angle adjustment means; It is a schematic diagram which shows operation|movement of an angle adjustment means. It is a schematic diagram which shows operation|movement of an angle adjustment means. FIG. 2 is a plan view showing a state of paper processed by the bag making machine of FIG. 1;

FIG. 1 shows a bag making machine 10 of one embodiment employing a paper folding device (first folding section 3) of the present invention. FIG. 1 is an overall configuration diagram of a bag making machine 10. As shown in FIG. The bag making machine 10 includes, in order from the upstream side in the conveying direction, a paper feeding section 1, a first crease processing section 2, a second crease processing section 4, a first folding section 3, a glue application section 5, a second folding section 6, and a A paper discharge section 7 is provided in the apparatus main body 10A.

A common form of "Western-style envelope" has a horizontally long rectangular shape and a sealing opening is formed on the long side. When producing a Western-style envelope with the bag making machine 10, for example, as shown in FIG. The front surface portion 101 is folded back and crimped to the piece portion 103 .

Specifically, the bag making machine 10 transports the planar paper 100 shown in FIG. A Western-style envelope 90 is manufactured by processing.

The paper 100 is composed of a front surface portion 101, a rear surface portion 102, a glue substituting piece portion (folding portion) 103 projecting on both sides of the rear surface portion (body portion) 102, and a rear surface portion 104. . As shown in FIG. 2(b), the paper 100 is folded at the first crease 111, which is the boundary between the rear surface portion 102 and the piece portion 103, and further, as shown in FIG. 2(c). Secondly, the second crease 112, which is the boundary line between the front surface portion 101 and the rear surface portion 102, is folded. Glue is applied to the surface of the piece 103 folded back at the first crease 111 . Both edges of the front surface portion 101 folded back at the second fold line 112 are joined to the piece portions 103 . Note that the first fold line 111 extends along the transport direction. The second fold line 112 extends along a direction perpendicular to the conveying direction (that is, the width direction).

The output may be the Western-style envelope 90 shown in FIG. 2(c). By processing the Western-style envelope 90 shown in FIG. 2(c) as shown in FIG. The rearmost surface portion 104 may be configured to be further folded at the third fold line 113 that is the boundary line between the rearmost surface portion 102 and the rearmost surface portion 104 . According to the above configuration, when the contents are inserted into the envelope and then sealed with tape or glue, since the envelope has a crease, it is possible to neatly seal the front side portion 101 where the rear side portion 104 is folded back. can.

[Paper feed unit 1]
The paper feed unit 1 further includes an air suction belt type air paper feed unit 12, an elevator type paper feed tray 11 that rises and falls according to the amount of paper loaded, and the paper 100 sent out by the air paper feed unit 12. and a conveying roller 81 for conveying to the downstream side in the conveying direction. Further, the air feeding unit 12 includes a sensor 22 for detecting that the uppermost sheet of the sheets 100 stacked on the feeding tray 11 is attracted to the lower surface of the air feeding unit 12, and a sheet feeding tray. A sensor 21 is arranged to detect the upper limit position of the uppermost surface of the sheets 100 stacked on the sheet 11 .

In addition to the conveying roller 81 , the bag making machine 10 includes five conveying roller pairs 82 , 85 , 86 , 87 , and 88 . The five conveying roller pairs constitute a conveying surface 200 on which the paper 100 is conveyed, and the conveying surface 200 is coplanar from the air feeding unit 12 to the conveying roller pair 88 . On the transport surface 200 on which the paper 100 is transported, there are sensors 23, 24, 25, 26, 27, and 28 for detecting the passage of the paper 100 at each position (detecting double feeding). are placed. Each sensor uses, for example, an optical transmission sensor.

[First crease processing unit 2]
As shown in FIG. 1, the first crease processing unit 2 is composed of an upper mold having a convex upper part and a lower mold having a concave lower part. A transverse crease is formed in the direction perpendicular to the direction. A known mechanism can be employed as the crease processing portion 2 .
[Second crease processing unit 4]
As shown in FIG. 1, the second crease processing unit 4 includes an upper crease edge 83 having a round edge shape and a convex portion formed on the outer peripheral portion, and a lower edge edge having a round edge shape and a concave portion formed on the outer peripheral portion. are installed at two locations in the width direction perpendicular to the transport direction, and vertical creases are formed along the paper transport direction at the first creases 111 (two locations) of the paper 100 . A known mechanism can be employed as the second crease processing portion 4 . The crease blade 83 may be composed of a circular upper blade having a concave portion formed on the outer peripheral portion thereof and a circular lower blade having a convex portion formed on the outer peripheral portion thereof.

[First folding part 3]
FIG. 6 is a perspective view showing the overall configuration of the first folding portion 3. As shown in FIG. As shown in FIG. 6, the first folding unit 3 serves as folding means for folding the left and right pieces 103 of the paper 100. As shown in FIG. 6, a pair of folding devices ( It consists of a first folding device 3a and a second folding device 3b). The pair of folding devices 3a and 3b have a symmetrical structure. FIG. 7 shows the first folding device 3a arranged on the left side of FIG. 6, and has a folding plate 32 that rotates around a rotating shaft 31 along the conveying direction. An upper guide plate 36 is provided above the lower guide plate 33 with a predetermined gap therebetween, and a pair of conveying rollers (a driving roller 38 and a driven roller 35). 7, the rotating shaft of the driven roller 35 and other drive mechanisms are omitted.

As folding means, a pair of folding devices consisting of a first folding device 3a and a second folding device 3b arranged opposite to each other in the width direction in the direction perpendicular to the paper conveying direction is provided. In the case of a sheet having two folded portions on both sides in the width direction in the right angle direction, it is possible to carry out folding processing of the piece portions 103 at two locations at the same time by carrying the sheet once, resulting in good workability.

In FIG. 6, between the first folding device 3a and the second folding device 3b, a transporting means 15 is further arranged for transporting while holding the central portion of the sheet on the transport path. The conveying means 15 is composed of a pair of upper and lower conveying rollers 151, 152, 153, 154, 155 and 156. Of the pair of upper and lower conveying rollers, the upper conveying rollers 151, 153 (not shown) and 155 (not shown) is unitized so that the operator can easily attach and detach the unit 15a from the paper folding apparatus main body 10 by holding the handle 16 of the unit 15a in case of paper jam or maintenance.

Between the first folding device 3a and the second folding device 3b, the transporting means 15 for transporting the paper while holding the central portion of the paper on the transport path is arranged. In the case of simultaneously folding the folded portions in two places, the paper is conveyed stably and the processing accuracy is stabilized.

As shown in FIG. 5(a), each of the first folding device 3a and the second folding device 3b has a folding plate 32 that rotates around a rotation shaft 31 along the transport direction. Further, an upper guide plate 36 is provided above the lower guide plate 33 with a predetermined gap therebetween, and a pair of conveying rollers (a driving roller 38 and a driven roller 35). A notch is formed in the lower guide plate 33 at the nip portion of the roller pair.
At the folding position where the piece 103 of the paper is folded, as shown in FIG. As shown in FIG. 5(b), by rotating the folding plate 32 in the R5 direction, as shown in FIG. It can be folded inwards to fit.

According to the above, since the piece 103 of the paper 100 is folded back onto the upper surface of the upper guide plate while the main body of the paper 100 is held between the pair of upper and lower guide plates (36, 33), during processing, It is possible to prevent wrinkles from occurring in the crease portion of the paper, and to secure the accuracy of the crease position when folding the piece portion 103 .

(Angle adjustment means 50)
Next, the angle adjustment means 50 of the upper guide plate 36 will be described with reference to FIGS. 14 to 18. FIG. 17, the first folding device 3a adjusts the relative angle .theta. is further provided with angle adjustment means 50 that can be adjusted in the R10 or R11 direction.

The angle adjustment means 50 is a mechanism for adjusting the angle of the upper guide plate 36 in the horizontal direction, and as shown in FIG. A mounting plate 53 having a mechanism 52 is attached to the main body of the first folding device 3a with a simple screw 55. As shown in FIG. The simple screw 55 is a screw that can be easily removed by the operator without using tools or the like. As a result, the operator can easily clear the jam. A holding mechanism 54 for the conveying roller 35 is further attached to the mounting plate 53 . Although the angle adjusting means 50 has been described using the first folding device 3a, the second folding device 3b has the same configuration, and the description thereof is omitted here.

Specifically, as shown in FIG. 15, the shaft portion 51 has a lower tip portion of the shaft 511 fixed to the folded side portion 361 of the upper guide plate 36 with a screw 512, and the shaft 511 is attached to the mounting plate. It is rotatably supported through mounting portions 513 , 516 and 517 integrally formed with 53 . The upper portion of the shaft 511 is counterbore, and the adjusting screw 5111 abuts against the counterbore portion of the upper portion of the shaft 511 via a nut 515 integrally fixed to the mounting portion 516, thereby rotating the adjusting screw 5111. By turning, the vertical position of the shaft 511 is adjusted. A spring 518 is inserted between the E-ring 514 fixed to the shaft 511 and the mounting portion 513, and the counterbore portion on the upper portion of the shaft 511 is adjusted by an upward pulling force on the shaft 511. It is pressed against the bottom of the screw 5111 . Therefore, the vertical position (height) of the upper guide plate 36 is adjustable. Further, as shown in FIG. 5C, the folding plate 32 is rotated in the R5 direction, and the piece portion 103 of the paper 100 is superimposed on the surface of the rear surface portion (main body portion) 102 via the upper guide plate 36. When folded inward to match, the upper guide plate 36 is pushed downward against the upward pull-up force on the shaft 511 . Therefore, the crease 111 of the paper 100 is firmly formed.

Further, the angle adjusting means 50 rotates the upper guide plate 36 around the shaft 511 as a pivot point of the upper guide plate 36 in a horizontal direction that intersects the sheet conveying direction F (R10 in FIG. 17, R11) is further provided with a screw mechanism 52 that rotates so that the angle can be adjusted. In FIG. 15, when the operator rotates the dial 521 clockwise or counterclockwise, the screw mechanism 52 rotates the folded side portion 361 of the upper guide plate 36 and the folded side portion 531 of the mounting plate 53 accordingly. You can widen or shrink the gap between the Therefore, the upper guide plate 36 can be rotated so that the angle can be adjusted. Incidentally, the screw mechanism 52 may be manually adjusted by an operator, or may be automatically adjusted by a motor.

Specifically, as shown in FIG. 16( a ), in the screw mechanism 52 , the dial 521 is integrally formed with a screw portion, and is rotatably supported through the folded side portion 361 of the upper guide plate 36 . Further, it is fitted into the inner threaded portion 527 of the folded side portion 531 of the mounting plate 53 . A detection plate 524 is fixed to the tip of the screw portion of the dial 521, and the rotation of the dial 521 is restricted to 360° by a stopper 523. A gear portion 522 is integrally fixed to the screw portion of the dial 521, and as shown in FIG. is rotated to adjust the angle of the upper guide plate 36, it can serve as a locking mechanism that fixes the tilt angle of the upper guide plate 36 during the angle adjustment. 16C is a schematic see-through cross-sectional view from the right side of FIG.

According to the above, with a simple and inexpensive configuration, it is possible to prevent misalignment of the folded portion of the paper 100 and to ensure the accuracy of the fold position when folding the piece portion 103 . Further, since the angle adjustment means has a lock mechanism for fixing the inclination angle of the upper guide plate during angle adjustment, it is possible to prevent the inclination angle of the upper guide plate from being displaced after the angle adjustment.

18A and 18B are schematic diagrams showing the operation of the angle adjusting means 50. FIG. As shown in FIG. 18(a), when the operator rotates the dial 521 clockwise, the upper guide plate 36 rotates in the R10 direction about the shaft 511 serving as the rotation fulcrum of the upper guide plate 36. . As shown in FIG. 18B, when the operator rotates the dial 521 counterclockwise, the upper guide plate 36 rotates in the R11 direction around the shaft 511 serving as the rotation fulcrum of the upper guide plate 36. Rotate.

Further, the paper folding apparatus of the present invention has a test paper feeding mode. In the test paper feeding mode, in the paper feeding section 1, only one sheet of the uppermost sheet of the paper 100 stacked on the paper feeding tray 11 is fed as a test, and the operator bends the paper 100 after the folding process. In this mode, the degree of folding misalignment is visually confirmed, and the inclination angle θ of the upper guide plate 36 is adjusted by the angle adjusting means 50 according to the degree.

According to this, with a simple and inexpensive configuration, it is possible to prevent misalignment of the folded portion of the sheet 100 and ensure the accuracy of the fold position when folding the piece portion 103 .

Next, the rotating mechanism 300 for the folding plate 32 will be described with reference to FIGS. 8 and 9. FIG.

FIG. 8 shows a state in which the folding plate 32 is arranged at the placement position where the piece 103 of the paper 100 is placed, and FIG. are on the way to a superposition position where they are superimposed toward the main body. 8 and 9 are front views of the first folding device 3a of FIG. 7 as seen from direction A, respectively. Since the second folding device 3b has the same configuration as the first folding device 3a, the description thereof will be omitted.

The first folding device 3a, as shown in FIG. 8, comprises a folding means having a folding plate 32 which reciprocates around a shaft 31 along the conveying direction. The folding plate 32 is provided so as to rotate 180 degrees on the horizontal plane. The rotating mechanism 300 of the folding plate 32 includes a motor 301, a first pulley 302, a transmission belt 303, a second pulley 304, a rotating gear 305, a swing gear 306, a slide shaft 307, and a slide receiving portion 308. and The transmission belt 303 is stretched over the first pulley 302 and the second pulley 304 . The second pulley 304 and the rotating gear 305 are integrally supported by the rotating shaft 311 . The rocking gear 306 is supported by a rotating shaft 312 . The slide shaft 307 protrudes from the upper end of the rocking gear 306 . The slide receiving portion 308 is integrally formed perpendicular to the folding plate 32 . A slide groove 3081 for receiving the slide shaft 307 is formed in the slide receiving portion 308 . The slide shaft 307 is movably engaged with the slide groove 3081 via the spacer 309 .

The rotating mechanism 300 operates as follows. That is, when the motor 301 operates, the rotating gear 305 rotates through the first pulley 302 , the transmission belt 303 and the second pulley 304 . When the rotating gear 305 rotates, the rocking gear 306 rocks and the folding plate 32 rotates.

That is, when the rotary gear 305 rotates in the R1 direction, the rocking gear 306 rocks in the R3 direction, the slide shaft 307 moves in the slide groove 3081 of the slide receiving portion 308, and as a result, the folding plate 32 moves in the R5 direction. to rotate. Conversely, when the rotary gear 305 rotates in the R2 direction, the rocking gear 306 rocks in the R4 direction, the slide shaft 307 moves within the slide receiving portion 308, and as a result, the folding plate 32 rotates in the R6 direction. do. Therefore, according to the rotating mechanism 300, the folding plate 32 can be rotated 180 degrees on the horizontal plane, as shown in FIGS. 5(a) to 5(c). As a result, according to the first folding device 3a, as shown in FIG. By rotating the folding plate 32 in the R5 direction, the folding plate 32 can be folded inward through the upper guide plate 36 so as to overlap the surface of the rear surface portion 102 . (Refer to FIG. 5 for the rotation directions R5 and R6 of the folding plate 32.)

The position (inclination angle) of the folding plate 32 in FIG. 9 corresponds to FIG.

[Glue application unit 5]
The glue application unit 5 is composed of a pair of application devices 5a and 5b arranged opposite to each other in the width direction. In addition, the coating device 5a and the coating device 5b have a bilaterally symmetrical configuration.

The coating devices 5a and 5b have a nozzle portion, a position setting mechanism, and a vertical drive mechanism (not shown). The nozzle portion can apply glue to the paper being conveyed at a predetermined timing.

[Second Folding Section 6]
The second folding unit 6 is a paper folding device that folds the planar paper 100 while conveying it along the conveying surface 200. The second folding unit 6 includes a pair of first conveying rollers 86 arranged on the upstream side in the paper conveying direction. , a second conveying roller pair 87 arranged on the downstream side in the paper conveying direction, a switching gate plate 63 installed between both roller pairs, a folding plate 62 arranged above the switching gate plate 63, It has

The switching gate plate 63 is rotatable around the support shaft 631 and interferes with the transported paper 100 so that the leading edge of the paper 100 passes over the upper surface of the upper roller 871 of the second transport roller pair 87. can be switched between a first guide position that guides upward so as to do so and a second guide position that guides in a substantially horizontal direction toward the nip portion 873 of the second conveying roller pair 87, The folding plate 62 is configured to be movable in the vertical direction while maintaining a substantially horizontal state. It is possible to switch between the retracted position and the retracted position.

[Pressure part 8]
The pressure unit 8 is composed of a vertically movable upper mold 8a and a stationary lower mold 8b. By pinching, additional pressure is applied to make the folds firmer.

[Paper discharge unit 7]
The paper discharge section 7 has a transport roller pair 88 and a paper discharge tray 71 . The transport roller pair 88 is provided to act as an ejection roller. Specifically, as shown in FIG. 1, the conveying roller pair 88 is arranged near the second conveying roller pair 87 of the second folding section 6 and downstream in the conveying direction. The 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 configured as described above will be described.

First, the paper 100 shown in FIG. 2 is placed on the paper feed tray 11 . At this time, the front surface portion 101 is positioned downstream in the transport direction. Then, a switch (not shown) is turned on to start operation.

(1) The paper 100 on the uppermost surface of the paper feed tray 11 is sent toward the transport roller pair 81 while being sucked by the air suction belt in the air paper feed unit 12, and the paper 100 is transferred to the transport roller pair 81. After that, it is further conveyed downstream in the conveying direction by the conveying roller pair 81 . After that, it passes through the first crease processing section 2 . At this time, the first crease processing unit 2 operates to form creases on the second fold line 112 and the third fold line 113 of the paper 100 . As a result, the front surface portion 101 can be easily folded back toward the rear surface portion 102 side. In addition, the rearmost surface portion 104 can be easily folded back toward the folded front surface portion 101 side.

(2) The paper 100 conveyed from the first crease processing section 2 passes through the second crease processing section 4 . At this time, the first creases 111 (two places on the left and right in the width direction) of the paper 100 are directly below the crease blades (round blades) of the second crease processing unit 4 that are installed in two places in the width direction perpendicular to the conveying direction. positioned. Then, the second crease processing unit 4 operates to form a crease on the first crease 111 . As a result, the pieces 103 (two places on the left and right in the width direction) can be easily folded inward.

(3) The paper 100 on which creases are formed by the second crease processing section 4 stops at the first folding section 3 . By forming a crease in advance on the crease (111) when folding the piece 103 of the paper 100, it is possible to secure the accuracy of the crease position when folding the flap.

As shown in FIG. 5, in the first folding portion 3, in addition to the basic configuration of folding the piece portion 103 by the folding plate 32, an upper guide plate 36 is installed above the lower guide plate 33 with a predetermined gap. , and a transport roller pair (drive roller 38 and driven roller 35) for transporting the paper 100 transported on the lower guide plate 33 further downstream. A notch is formed in the lower guide plate 33 at the nip portion of the conveying roller pair.

In FIG. 5A, the folding plate 32 of the folding device 3a (3b) of the first folding section 3 is positioned on the outside in the width direction, and the pieces 103 on both sides of the paper 100 are placed on the folding plate 32. (placement position).

Next, in FIG. 5(b), the folding plate 32 is rotated in the R5 direction toward the inner lower guide plate 33, whereby the piece 103 is folded back inward at the crease-processed first crease 111. Then, as shown in FIG. 5(c), it is overlaid on the rear surface portion (main body portion) 102 via the upper guide plate 36 (overlap position).

After that, in FIG. 5(d), the folding plate 32 rotates in a direction R6 away from the lower guide plate 33 on the outer side. Then, the pair of conveying rollers (the driving roller 38 and the driven roller 35) conveys the sheet 100 with the folded portion 103 downstream in the conveying direction. By rotating the folding plate 32 by at least a predetermined angle in the direction R6 away from the lower guide plate 33 before starting to convey the paper 100, the paper after folding is transferred to the folding plate and the pair of upper and lower guide plates. The sheet can be smoothly conveyed toward the downstream side of the folding position in the sheet conveying direction without being interfered with.

5(a) to 5(d), an upper guide plate 36 and a driven roller 35 as a pressing roller for holding the paper 100 on the upper guide plate 36 are provided, and the folding means is the piece 103 of the paper. When bending the sheet 100, the control means stops the driving of the pair of conveying rollers (the driving roller 38 and the driven roller 35) at the bending position to stop conveying the sheet 100, and the main body of the sheet 100. While holding the portion 102 between the pair of conveying rollers 38 and 35, the piece portion 103 of the paper 100 is controlled to be folded.

According to the above, while the body portion 102 of the paper is held between the pair of upper and lower guide plates 36, 33, the piece 103 of the paper 100 is folded back onto the upper surface of the upper guide plate 36, and at the same time, the paper 100 is folded. While holding the body portion 102 between the pair of conveying rollers 36 and 33, the piece portion 103 of the paper 100 is folded. Therefore, it is possible to further ensure the accuracy of the fold position when folding the piece 103 .

(4) The paper 100 with the folded back portion 103 is conveyed downstream in the conveying direction by the conveying roller pair 85 and passes through the glue applying section 5 . In the glue applying section 5, when the folded back pieces 103 of the sheet 100 start to pass, the nozzle sections 5a and 5b installed at two positions in the width direction perpendicular to the conveying direction move downward. , contact the surface of the piece 103, and when the passage of the piece 103 is completed, the nozzles 5a and 5b move upward and separate from the surface of the piece 103. As shown in FIG. As a result, glue is applied to the surface of the folded piece 103 . The folded piece 103 passes through the nozzles 5a and 5b while being pressed by the pair of transport rollers 85 positioned upstream of the nozzles 5a and 5b in the transport direction, or after being pressed. do. Therefore, the glue application work by the nozzles 5a and 5b can be stably performed.

(5) The second folding unit 6 is a paper folding device that folds the planar paper 100 while conveying it along the conveying surface 200, and includes a first conveying roller arranged upstream in the paper conveying direction. pair 86, a second transport roller pair 87 arranged downstream in the paper transport direction, a switching gate plate 63 installed on the paper transport surface 200 between the two roller pairs, and a switching gate plate 63 facing It has a folding plate 62 arranged and a control means (not shown) for controlling the operation of the whole device.

The switching gate plate 63 interferes with the paper 100 being conveyed, bends the paper conveying direction outward from the paper conveying surface 200, and directs the leading edge of the paper 100 toward one roller surface of the second conveying roller pair 87. and a second guide position for guiding along the sheet conveying surface 200 toward the nip portion 873 of the second conveying roller pair 87,

The folding plate 62 is configured to be movable toward the switching gate plate 63 while maintaining a substantially horizontal state. It is possible to switch between the evacuation position where it retreats at a predetermined interval,

The control means directs the leading edge of the conveyed paper 100 toward one roller surface of the second conveying roller pair 87 by a predetermined amount using the switching gate plate 63 arranged at the first guide position. , the switching gate plate 63 is switched to the second guide position, and then the folding plate 62 arranged at the retracted position is moved so as to sandwich the sheet 100 on the switching gate plate 63. By lowering the sheet 100 to the folding position in a substantially horizontal state, the leading edge of the sheet 100 is controlled to be folded back along one roller surface of the second conveying roller pair 87 .

Specifically, as an example, the substrates are sequentially processed as shown below.

The paper 100 with glue applied to the piece 103 is conveyed to the second folding section 6 (in the F direction) by the conveying roller pair 85 . At this time, the switching gate plate 63 is set upward toward the second conveying roller pair 87 as the first guide position. Therefore, as shown in FIG. 10, the sheet 100 is guided upward by the switching gate plate 63 so that the leading edge of the sheet 100 passes over the upper surface of the upper roller 871 of the second conveying roller pair 87. When the position of the second folding line 112 of 100 reaches the folding position (the position directly below the edge 621 of the folding plate 62), the transport is temporarily stopped. During this time, the folding plate 62 maintains the retracted position.

The width of the upper roller 861 of the first conveying roller pair 86 is set so that it does not come into contact with the surface of the piece 103 . No glue adheres to the first conveying roller pair 86 .

Next, as shown in FIG. 11, the switching gate plate 63 is moved to the second guide position (substantially horizontal position) while the folding plate 62 is maintained at the retracted position.

Next, as shown in FIG. 12, the folding plate 62 arranged at the retracted position is lowered to the folding position in a substantially horizontal state so that the paper 100 on the switching gate plate 63 is sandwiched therebetween. is folded back along the surface of the upper roller 871 of the second conveying roller pair 87 from the second folding line 112 . At this time, the distance between the switching gate plate 63 and the bent plate 62 after the descent is at least a gap that allows the sheet 100 to be conveyed between the bent plate 62 and the switching gate plate 63 . configured as follows. For example, a gap of approximately 1 mm is ensured.

According to the above, since it is not necessary to provide a paper insertion space (dividing path) and a stopper as a paper folding mechanism, the structure can be simply and inexpensively constructed without complicating the structure. In addition, since the control means automatically adjusts the folding position according to various folding specifications, it is possible to provide a paper folding apparatus with excellent operability. Further, it prevents the folded-back piece from being wrinkled, and also prevents adhesive from adhering to the interior of the folding mechanism such as the stopper during folding, which adversely affects the quality of the finished product.

Next, as shown in FIG. 13, after the front surface portion 101 of the paper 100 is folded back by lowering the folding plate 62, the front end portion of the paper 100 is folded back by the first conveying roller pair 86. is conveyed toward the nip portion 873 of the second conveying roller pair 87, the nip portion 873 of the second conveying roller pair 87 pinches the folded leading edge portion 105 of the sheet 100, and is folded in the F direction. By conveying the sheet, the leading edge folding portion 105 of the sheet is pressed and folded. Then, the entire front surface portion 101 is folded back to fit the surface of the rear surface portion 102 , and both edges of the front surface portion 101 are joined to the piece portions 103 at this time. Thus, a Western-style envelope 90 is obtained. It should be noted that the conveyance in the F direction is carried out until the rearmost surface portion 104 of the paper 100 passes through the nip portion 863 of the first conveying roller pair 86 by a predetermined amount. At this time, the paper 100 is conveyed through the gap between the folding plate 62 and the switching gate plate 63 (while being guided by both plates). According to this, the sheet can be reliably transferred to the pressing portion by the nip portion 873 of the second conveying roller pair 87 on the next stage without wrinkling or the like.

According to the above, after the leading edge of the paper 100 is folded back by lowering the folding plate, the folded leading edge portion of the paper 100 is pressed by the nip portion 873 of the second conveying roller pair 87 and folded. Therefore, it is possible to surely give a crease to the paper.

The paper folding device (first folding unit 3) in the present invention has been described as an embodiment in which it is employed as a paper folding mechanism in the bag making machine 10 for making Western envelopes, but the paper folding device (first folding unit 3) that simply folds paper is described as an embodiment. It can also be implemented as a paper folding device). It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with various modifications.

F Conveying direction F' Conveying direction R Rotational direction 3 First folding unit 6 Second folding unit 10 Bag making machine 10A Apparatus body 31 Rotating shaft 32 Folding plate 33 Lower guide plate 35 Driven roller (holding roller)
36 Upper guide plate 38 Drive roller 50 Angle adjustment means 51 Shaft portion 52 Screw mechanism 53 Mounting plate 54 Conveying roller holding mechanism 55 Simple screw 100 Paper 101 Front surface 102 Back surface 103 Glue substitute piece 104 Rear surface 105 Folded portion 106 folded portion 111 first fold 112 second fold 113 third fold

Claims (6)

A paper folding device that folds a flat paper while conveying it along a paper conveying path, wherein the paper has a main body and a folding part projecting from the main body,
a placing position provided at a folding position for folding the folded portion of the paper in the paper transport path, where the folded portion of the paper is placed about a pivot shaft substantially parallel to the paper transport path; folding means having a folding plate that rotates back and forth between a stacking position for stacking the folded portion of the sheet toward the main body;
The folding means includes a pair of upper and lower guide plates that constitute a part of the sheet conveying path at the folding position. The lower surface of the plate is configured to overlap the upper surface of the upper guide plate of the pair of upper and lower guide plates,
A paper folding apparatus, further comprising an angle adjusting means for adjusting a relative angle between an end face of the upper guide plate and a crease when folding the folded portion of the paper. The angle adjustment means comprises a screw mechanism that rotates the upper guide plate so as to be able to adjust the angle in a horizontal direction and in a direction that intersects the paper conveying direction about a rotation fulcrum of the upper guide plate. The paper folding device according to claim 1, characterized by: 3. The paper folding apparatus according to claim 1, wherein said angle adjusting means comprises a lock mechanism for fixing the inclination angle of said upper guide plate during said angle adjustment. A test paper feeding mode for an operator to check the degree of misfolding of the paper after the folding process and adjust the inclination angle of the upper guide plate by the angle adjusting means according to the degree of misalignment, 4. The paper folding device according to claim 1, wherein: The folding means includes a pair of transport rollers for guiding the main body of the paper to pass between the pair of upper and lower guide plates at the folding position on the paper transport path, and driving the pair of transport rollers. A control means for controlling the
When the folding means folds the folded portion of the sheet, the control means stops the driving of the pair of transport rollers at the folding position to stop the transport of the sheet. 5. The apparatus according to any one of claims 1 to 4, wherein the main body portion of the sheet is held between the pair of conveying rollers, and the folded portion of the sheet is bent. Paper folding device. A crease processing means is provided on the upstream side of the folding position in the sheet conveying direction, and the crease processing means is configured to form a crease in advance on the crease when folding the folded portion of the sheet. 6. The paper folding device according to any one of claims 1 to 5, wherein the paper folding device comprises:

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