JP2021187033A - Sheet conveyance device - Google Patents

Abstract

To provide a sheet conveyance device which is small in size and can be assembled simply and inexpensively, and is suitable for a bag making machine for manufacturing envelopes.SOLUTION: A sheet conveyance device includes a drive roller and a cylindrical driven roller opposed to the drive roller. The driven roller includes a second driven roller which is selectively movable between a contact position in which it is in contact with and co-rotates with the drive roller and a retreat position in which it retreats from the drive roller with a predetermined clearance.SELECTED DRAWING: Figure 13

Description

The present invention relates to a paper transport device. More specifically, the present invention relates to a paper transport device suitable for a paper folding device of a bag making machine for producing envelopes.

Conventionally, in a bag making machine (for example, Patent Document 1) that folds a medium such as paper to manufacture an envelope, a transport roller pair that constitutes a front stage of a paper folding device and introduces paper into a paper folding portion in the subsequent stage is provided. Be prepared. The transport roller pair is arranged on the downstream side in the transport direction from the glue coating portion due to the flow of folding the paper after the glue coating in the envelope production. Further, the length in the width direction of the upper roller of the transport roller pair is shorter than the length in the width direction of the lower roller, and the upper roller is in contact with the glue application portion applied to the paper surface at the glue application portion. It is designed not to be done.

WO2019043760A1 Gazette

In the configuration disclosed in Patent Document 1, while transporting the paper in only one direction, glue is applied by the glue coating portion, and then the paper is introduced into the paper folding portion by the transport roller pair, and the bottom of the envelope is used. When an envelope in which only the flap is folded back and crimped is used as the deliverable, the above configuration is sufficient, but some users convey the deliverable in the opposite direction and use the nip portion of the transport roller pair. There is a request that the top flap of the envelope also be folded back. In this case, focusing on the transport roller pair, the length in the width direction of the upper roller of the transport roller pair is insufficient, so that the same configuration cannot be uniformly folded back.

An object of the present invention is to provide a paper transport device that can be adapted to the request from the user, is compact, can be easily and inexpensively configured, and is suitable for a bag making machine for manufacturing envelopes.

In order to achieve the above object, the invention according to claim 1 is a paper transport device including a drive roller connected to a first drive source and rotating, and a cylindrical driven roller arranged to face the drive roller. In the first driven roller having a support shaft penetrating the hollow inside of the driven roller, and on the same axis as the support shaft, the first driven roller that constantly abuts on the drive roller and rotates with it, and the support shaft at a predetermined angle. By rotating to, it is configured to be selectively movable between the contact position that abuts on the drive roller and rotates with the drive roller and the retracted position that retracts by opening a predetermined gap from the drive roller. It is characterized in that a second driven roller is arranged.

The invention according to claim 2 is the paper transport device according to claim 1, wherein the second driven roller has both ends of the second driven roller via bearing members by their respective end supports. The support shaft is rotatably supported, and the support shaft located eccentrically from the rotation center of the second driven roller is passed through and fixed to the end support body, and both end portions of the support shaft are rotated around the support frame. It is characterized by being movably supported.

The invention according to claim 3 is the paper transport device according to claim 1 or 2, wherein the first driven roller has an outer peripheral surface of the support shaft and an inner peripheral surface of the first driven roller. It is characterized by having a bearing member arranged between them and rotatably supporting the first driven roller with respect to the support shaft.

The invention according to claim 4 is the paper transport device according to any one of claims 1 to 3, wherein a second drive source is connected to the support shaft, and the support is supported by the second drive source. It is characterized by comprising a control means for selectively moving the second driven roller to a contact position and a retracted position by rotating a shaft at a predetermined angle.

The invention according to claim 5 has the paper transport device according to any one of claims 1 to 4, and is a paper fold that bends flat paper while transporting it along the paper transport surface. In the apparatus, the paper folding device further includes, at least, a glue applying portion for applying glue to a predetermined portion of the conveyed paper and a paper folding portion for bending a predetermined portion of the conveyed paper, and during paper conveying. The second driven roller is characterized by comprising a control means for moving the second driven roller to the retracted position when the second driven roller directly interferes with the glue application portion on the paper to which the glue is applied. It is something to do.

According to the first aspect of the present invention, the second driven roller can be easily changed to the retracted position and the contact position with respect to the drive roller by rotating the support shaft to a predetermined angle. By setting the second driven roller to the retracted position, a predetermined gap is formed between the second driven roller and the driving roller, and the upper surface of the paper to be conveyed does not come into contact with the second driven roller. Paper can be conveyed only by the conveying force between one driven roller and the driving roller. Therefore, if there is a place on the upper surface of the paper to be conveyed that does not want to be interfered with by the second driven roller, such as a place where glue is applied, it can be easily avoided. If there is no place on the upper surface of the paper to be conveyed that does not want to be interfered with by the second driven roller, the second driven roller is set to the contact position between the first driven roller and the drive roller. Both the nip portion and the nip portion between the second driven roller and the drive roller can convey the paper while niping (pressing) the paper over a wide range.

According to the second aspect of the present invention, the second driven roller can be easily changed to the retracted position and the contact position with a simple and inexpensive configuration. As a result, the entire device can be made smaller.

According to the third aspect of the present invention, the first driven roller is coaxial with the support shaft of the second driven roller without being affected by the movements of the retracted position and the contact position of the second driven roller. Therefore, it can always be in contact with the drive roller and rotate with it.

According to the fourth aspect of the present invention, the second driven roller is connected to the support shaft by connecting the second drive source to the support shaft and rotating the support shaft at a predetermined angle by the second drive source. It is convenient for the operator because the position can be automatically changed between the contact position and the retracted position.

According to the invention according to claim 5, in the paper folding apparatus having the paper transporting apparatus according to any one of claims 1 to 4, the paper folding apparatus has at least a glue coating portion and a paper folding portion. When the second driven roller directly interferes with the glue-applied portion on the paper to which the glue is applied during paper transport, the second driven roller moves to the retracted position.
Therefore, it is possible to easily prevent the glue application portion on the upper surface of the paper to be conveyed from being interfered with by the second driven roller.

It is a schematic whole block diagram of the bag making machine of 1st Embodiment of this invention. It is a top view which shows the state of the paper which is processed by the bag making machine of FIG. It is a top view which shows the state which the paper of FIG. 2 is folded. It is a perspective view which shows the state in the process of manufacturing a Western-style envelope. It is a figure which shows the state of the processing of the paper in the 2nd folding part. It is a figure which shows the state of the processing of the paper following FIG. It is a figure which shows the state of the processing of the paper following FIG. It is a figure which shows the state of the processing of the paper following FIG. It is a figure which shows the state of the processing of the paper following FIG. It is a figure which shows the state of the processing of the paper following FIG. It is a figure which shows the state of the processing of the paper following FIG. It is a figure which shows the state of the processing of the paper following FIG. It is sectional drawing which shows the state which the 2nd driven roller moved to the retracted position. It is sectional drawing which shows the state which the 2nd driven roller moved to the contact position. It is sectional drawing which shows the structure of the 2nd driven roller. It is sectional drawing which shows the structure of the 1st driven roller. It is a figure which shows the state before and after folding back the flap in the 1st folding part. It is a figure which shows the state of passing the envelope after glue application through the second driven roller in the retracted state.

FIG. 1 shows a bag making machine 10 of an embodiment using the paper folding device (second folding portion 6) of the present invention. FIG. 1 is an overall configuration diagram of the bag making machine 10. The bag making machine 10 has, in order from the upstream side in the transport direction, a paper feed unit 1, a first crease processing unit 2, a second crease processing unit 4, a first folding unit 3, a glue coating unit 5, a second folding unit 6, and The paper ejection unit 7 is provided in the apparatus main body 10A.

The general form of a "Western style envelope" has a horizontally long rectangle and a sealing port is formed on the long side. When manufacturing a Western-style envelope with the bag making machine 10, for example, as shown in FIG. 4, glue is applied to the folded piece 103 on both sides of the rear surface 102 of the paper 100, and the front surface 101 Is folded back and crimped to one part 103.

Specifically, the bag making machine 10 conveys the flat paper 100 shown in FIG. 2A in the F direction as shown in FIGS. 2B and 2C. By processing, a Western-style envelope 90 is manufactured.

The paper 100 includes a front surface portion 101 (bottom flap), a rear surface portion 102, a glue substitute piece 103 protruding on both sides of the rear surface portion 102, and a rearmost portion 104. As shown in FIG. 2B, the paper 100 is folded at the first crease 111 which is the boundary line between the rear surface portion 102 and the single portion 103, and further, as shown in FIG. 2C. In addition, the second fold 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. Then, both edges of the front surface portion 101 folded back at the second fold 112 are joined to the single portion 103. The first fold 111 is along the transport direction. The second fold 112 is along a direction (that is, a width direction) orthogonal to the transport direction.

The deliverable may be the Western-style envelope 90 of FIG. 2 (c), but the Western-style envelope 90 shown in FIG. 2 (c) is conveyed from FIG. 3 (a) to FIG. 3 (b) while being conveyed in the F'direction. By processing as shown, the rearmost portion 104 (top flap) is configured to be further folded at the third fold 113 which is the boundary line between the rear surface portion 102 and the rearmost direction portion 104. May be good. According to the above configuration, after inserting the contents into the envelope, when sealing with tape or glue, there is a crease, so that the rearmost portion 104 can be neatly sealed in the folded front surface portion 101. can.

[Paper Feed Unit 1]
The paper feed unit 1 further conveys the air suction belt type air paper feed unit 12, the elevator type paper feed tray 11 that rises and falls according to the paper load capacity, and the paper fed by the air paper feed unit 12. It has a transport roller 81 for transporting to the downstream side in the direction. Further, the air paper feed unit 12 includes a sensor 22 for detecting that the uppermost paper loaded on the paper feed tray 11 is attracted to the lower surface of the air paper feed unit 12, and the paper feed tray 11. A sensor 21 for detecting the upper limit position of the uppermost surface of the paper loaded on the paper is arranged.

In addition to the transfer roller 81, the bag making machine 10 includes six transfer roller pairs 82, 84, 85, 86, 87, 88. The six transport roller pairs constitute a transport surface 200 on which the paper 100 is transported, and the transport surface 200 is the same plane from the air feeding unit 12 to the transport roller pair 88. Further, on the transport surface 200 on which the paper is conveyed, a sensor 23, a sensor 24, a sensor 25, a sensor 26, a sensor 27, and a sensor 28 for detecting the passage of the paper at each position (detecting double feed) are arranged. ing. For each sensor, for example, an optical transmission sensor is used.

[1st crease processing part 2]
As shown in FIG. 1, the first crease processing portion 2 is composed of an upper die having a convex upper portion and a lower die having a concave lower portion, and is used as a second fold 112 and a third fold 113 of the paper 100 to convey paper. A lateral crease is formed in the direction perpendicular to the direction. A known mechanism can be adopted as the crease processing unit 2. The first crease-processed portion 2 may be composed of an upper mold having a concave upper portion and a lower mold having a convex lower portion.
[Second crease processing section 4]
As shown in FIG. 1, the second crease-processed portion 4 has an upper blade having a round blade shape with a convex portion formed on the outer peripheral portion and a lower blade having a round blade shape having a concave portion formed on the outer peripheral portion. It is configured at two locations in the width direction perpendicular to the transport direction, and forms vertical creases along the paper transport direction at the first fold 111 (two locations) of the paper 100. A known mechanism can be adopted as the first crease processing unit 4.

[1st folding part 3]
The first folding portion 3 is composed of a pair of folding devices 3a and 3b arranged so as to face each other on both sides in the width direction perpendicular to the paper transport direction. Each folding device 3a and 3b has a flap plate 32 that rotates around a rotation shaft 31 along the transport direction, and is located outside in the width direction as shown in FIG. 17A. The piece 103 of the paper 100 placed on the flap plate 32 is folded inward so as to match the surface of the rear surface portion 102 by rotating the flap plate 32 as shown in FIG. 17 (b). Can be done.

[Glue application part 5]
The glue coating portion 5 includes a pair of coating devices 5a and 5b arranged so as to face each other on both sides in the width direction. The coating device 5a and the coating device 5b have a symmetrical structure.

The coating devices 5a and 5b have a nozzle portion, a position setting mechanism, and a vertical drive mechanism (not shown). The nozzle portion is designed so that glue can be applied to the conveyed paper at a predetermined timing.

[Second folding part 6]
As shown in FIG. 1, the second folding portion 6 is a paper folding device that bends a flat paper 100 while transporting it along a transport surface 200, and is arranged on the upstream side in the paper transport direction. One transport roller pair 86, a second transport roller pair 87 arranged on the downstream side in the paper transport direction, a switching gate plate 63 installed between both roller pairs, and a switching gate plate 63 arranged above the switching gate plate 63. It is provided with a folded plate 62.

As shown in FIG. 13, the first transfer roller pair 86 as the paper transfer device is arranged so as to face the drive roller 862 that is connected to the first drive source (not shown) and rotates, and the drive roller 862. It is provided with a cylindrical driven roller 861. Further, the driven roller 861 always abuts on the drive roller 862 on the same axis as the support shaft 72 penetrating the hollow inside of the driven roller 861, and rotates with the first driven roller 8612 at a predetermined angle. By rotating to, it is configured to be selectively movable between the contact position that abuts on the drive roller 862 and rotates with the drive roller 862 and the retracted position that retracts from the drive roller 862 with a predetermined gap. The second driven rollers 8611 and 8613 are arranged.

In this embodiment, the first driven roller 8612 and the second driven rollers 8611 and 8613 are arranged on both sides of the first driven roller 8612 on the same axis as the support shaft 72, and the driving rollers are also arranged. The 862 has a length that allows them to be shared, and both rollers of the second driven roller 8611 and the second driven roller 8613 are in phase with respect to the drive roller 862 between the contact position and the retracted position. Is configured to move.

14 is a cross-sectional view showing a state in which the second driven rollers 8611 and 8613 are in contact with the drive roller 862 and are arranged at the contact positions where the driven rollers 8611 and 8613 rotate with each other. 2 is a cross-sectional view showing a state in which the driven rollers 8611 and 8613 are arranged at a retracted position in which a predetermined gap is opened and retracted from the drive roller 862.

FIG. 15 is a cross-sectional view showing the structure of the second driven roller 8613. Specifically, the second driven roller 8613 is a hollow roller 76 made of a metal material such as aluminum, and its surface layer is composed of a rubber or other elastic material layer. Both ends of the second driven roller 8613 are rotatably supported by the respective end supports 73 via the bearing member 74, and the end support 73 is biased from the rotation center of the second driven roller 8613. The support shaft 72, which is positioned in the center, is passed through and fixed integrally using screws 78 and 79. The length of the screw 78 is shorter than that of the screw 79 in consideration of the time of assembly, and is set to a length that fits inside the hollow roller 76 after assembly.

Both end portions of the support shaft 72 are rotatably supported by the support frame 75 via the bearing 91. The bearing 91 is supported by an elongated hole (not shown) formed in the support frame 75, and is pressurized to the drive roller side by a spring 92. Since the second driven roller 8611 has the same configuration as the second driven roller 8613, the description thereof is omitted here.

The movement of the second driven rollers 8611 and 8613 to the contact position and the retracted position may be configured such that the operator manually rotates the adjustment dial attached to the support shaft 72. More preferably, a second drive source 70 such as a gear motor is connected to the support shaft 72, and the support shaft 72 is rotated by the second drive source 70 at a predetermined angle, whereby the second driven roller 8611. The 8613 may be configured to be provided with control means for selectively and automatically moving the 8613 to the contact position and the retracted position. By doing so, it is convenient for the operator.

FIG. 16 is a cross-sectional view showing the structure of the first driven roller 8612. Specifically, the first driven roller 8612 is a hollow roller made of a metal material such as aluminum, and its surface layer is rubber. It is composed of other elastic material layers. The first driven roller 8612 is disposed between the outer peripheral surface of the support shaft 72 and the inner peripheral surface of the first driven roller 8612, and rotatably supports the first driven roller 8612 with respect to the support shaft 72. It has a bearing member 77 and a bearing member 77. The first driven roller 8612 is not directly fixed to the support shaft 72, but is arranged on both sides coaxially and is fixed to the support shaft 72 using screws 78 and 79, respectively. The second driven rollers 8611 and 8613 prevent the movement in the axial direction.

According to the above configuration, by rotating the support shaft 72 at a predetermined angle, the second driven rollers 8611 and 8613 can be easily changed to the retracted position and the contact position with respect to the drive roller 862. By setting the second driven rollers 8611 and 8613 to the retracted position, a predetermined gap is formed between the second driven rollers 8611 and 8613 and the drive roller 862, and the upper surface of the paper to be conveyed is the second driven roller 8611. The paper can be conveyed only by the conveying force between the first driven roller 8612 and the driving roller 862 without coming into contact with the 8613. Therefore, if there is a place on the upper surface of the paper to be conveyed, such as a place where glue is applied, which is not desired to be interfered with by the second driven rollers 8611 and 8613, it can be easily avoided. Further, by setting the second driven rollers 8611 and 8613 to the contact position, the nip portion between the first driven roller 8612 and the drive roller 862 and the second driven roller 8611 and 8613 and the drive roller 862 are separated from each other. At both sides of the nip portion, the paper folded over the glue-applied portion can be uniformly crimped over a wide area.

As described above, in the present invention, the second driven rollers 8611 and 8613 are retracted to avoid the place where the glue is applied to the paper, and the second driven rollers 8611 and 8613 are in contact with each other and press-welded at the nip portion. The configuration can be realized with one paper transport device (paper folding device). Therefore, it can be configured easily and inexpensively, and as a result, the entire device can be made compact.

[Pressurizing unit 8]
The pressurizing portion 8 is composed of an upper die 8a that can move up and down and an immovable lower die 8b. By sandwiching it, further pressure is applied to strengthen the folded part.

[Paper ejection part 7]
The paper ejection unit 7 has a transport roller pair 88 and a paper ejection tray 71. The transport roller pair 88 is provided to operate as a discharge roller. Specifically, as shown in FIG. 1, the transport roller pair 88 is arranged in the vicinity of the second transport roller pair 87 of the second folding portion 6 and downstream in the transport direction. The output tray 71 is inclined diagonally upward and downstream in the transport direction from a position below the transport surface 200.

Next, the operation of the bag making machine 10 having the above configuration 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 located on the downstream side in the transport direction. Then, the switch (not shown) is turned on to start the operation.

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

(2) The paper 100 conveyed from the first crease processing unit 2 by the transfer roller 82 passes through the second crease processing unit 4. At this time, the first crease 111 (two places on the left and right in the width direction) of the paper 100 is directly below the crease blade 83 (round blade) of the second crease processing portion 4 installed at two places in the width direction perpendicular to the transport direction. Each is located. Then, the second crease processing portion 4 operates to form a crease at the first crease 111. As a result, the one piece 103 (two places on the left and right in the width direction) can be easily folded back inward.

(3) The paper 100 on which the crease is formed by the second crease processing portion 4 stops at the first folding portion 3. At this time, the flap plates 32 of the double-folding devices 3a and 3b of the first folding portion 3 are located outside in the width direction of the paper 100, and the one-sided portions 103 on both sides of the paper 100 are placed on the flap plates 32. (Fig. 17 (a)). In FIG. 17, the paper 100 is conveyed from the front side to the back side in the drawing. The flap plate 32 then rotates toward the inner lower guide plate 33, which causes the piece 103 to be folded back inward at the crease-processed first crease 111 to fit the surface of the rear surface portion 102 ( FIG. 17 (b)). After that, the flap plate 32 rotates in a direction away from the outer lower guide plate 33. Then, the paper 100 with the piece 103 folded back is conveyed downstream in the conveying direction by the conveying roller pair 85. The flap plate 32 rotated outward is maintained in that state until the next paper 100 arrives. In the state where the flap plate 32 is rotated inward, the paper 100 with the folded piece 103 is conveyed downstream in the conveying direction, and the flap plate 32 is rotated outward before the next paper 100 is conveyed. It may be operated to move.

(4) The paper 100 with the piece 103 folded back is conveyed downstream in the conveying direction by the conveying roller pair 85, and passes through the glue applying portion 5. In the glue application portion 5, when the passage of the folded side piece 103 of the paper 100 starts, the nozzle portions 5a and 5b installed at two locations in the width direction perpendicular to the transport direction move downward. When the nozzles 5a and 5b come into contact with the surface of the piece 103 and the passage of the piece 103 is completed, the nozzles 5a and 5b move upward and the nozzles 5a and 5b separate from the surface of the piece 103. 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 in a pressed state or after being pressed by the transport roller pair 85 located upstream in the transport direction of the nozzles 5a and 5b. do. Therefore, the glue application work by the nozzle portions 5a and 5b can be stably performed.

(Paper processing in the second folding portion 6)
The second folding portion 6 is a paper folding device that bends the flat paper 100 while transporting it along the transport surface 200, and is a paper folding device that is arranged on the upstream side in the paper transport direction with the first transport roller pair 86. , The second transport roller pair 87 arranged on the downstream side in the paper transport direction, the switching gate plate 63 installed on the paper transport surface 200 between the two roller pairs, and the switching gate plate 63 are arranged to face each other. A folding plate 62 and a control means (not shown) for controlling the operation of the entire device are provided.

The switching gate plate 63 interferes with the paper 100 to be transported, bends the paper transport direction outward from the paper transport surface 200, and directs the tip end portion of the paper 100 toward one roller surface of the second transport roller pair 87. It is possible to switch between the first guide position for guiding along the paper transport surface 200 toward the nip portion 873 of the second transport roller pair 87 and the second guide position for guiding along the paper transport surface 200.

The folded plate 62 is configured to be movable toward the switching gate plate 63 while remaining substantially horizontal, and has a folding position close to the switching gate plate 63 arranged at the second guide position and a predetermined position from the switching gate plate 63. It is possible to switch between the evacuation position and the evacuation position where the evacuation is performed at intervals.

The control means directs the tip end portion of the paper 100 to be conveyed by the switching gate plate 63 arranged at the first guide position toward one roller surface of the second transfer roller pair 87 by a predetermined amount. The folding plate 62 arranged at the retracted position is abbreviated so as to switch the switching gate plate 63 to the second guide position and then sandwich the paper 100 on the switching gate plate 63. By lowering the paper 100 to the folding position in the horizontal state, the tip of the paper 100 is controlled to be folded along the surface of one of the second transport rollers vs. 87.

Specifically, as an example, the processing is sequentially performed as shown in (5-1) to (5-8) below.

(5-1) The paper 100 to which the glue is applied to the piece 103 is conveyed (in the F direction) to the second folding portion 6 by the transfer roller pair 85. At this time, the switching gate plate 63 is set upward as the first guide position toward the second transfer roller pair 87. Therefore, as shown in FIG. 5, the paper 100 is guided upward by the switching gate plate 63 so as to pass the tip end portion of the paper 100 through the upper surface of the upper roller 871 of the second transport roller pair 87, and the paper 100 is guided upward. When the position of the second fold 112 of 100 reaches the fold position (the position directly below the end portion 621 of the folded plate 62), the transport is temporarily stopped. During this time, the folded plate 62 maintains the shelter position.

When the paper 100 having glue applied to one portion 103 is conveyed to the second folding portion 6 by the conveying roller pair 85, the support shaft 72 is rotated by a predetermined angle to drive the second fold. The second driven roller 8611, 8613 is moved to the retracted position so that the rollers 8611, 8613 do not interfere with the glue application portion on the paper to which the glue is applied. At this time, as shown in FIG. 18, the position of the piece 103 to which the glue is applied corresponds to the position of the second driven rollers 8611 and 8613 that have moved to the retracted position, respectively.
Further, the first driven roller 8612 can always abut on the drive roller 862 on the same axis as the support shaft 72 and rotate around without being affected by the movements of the second driven rollers 8611 and 8613. .. Therefore, it is possible to easily prevent the glue-applied portion on the upper surface of the paper to be conveyed from being interfered with by the second driven roller, and the switching gate plate 63 is niped in the range where the glue of the paper 100 is not applied. Can be transported towards.

(5-2) Next, as shown in FIG. 6, the folded plate 62 moves the switching gate plate 63 to the second guide position (substantially horizontal position) while maintaining the shelter position.

(5-3) Next, as shown in FIG. 7, the folded plate 62 arranged at the retracted position is lowered to the folded position in a substantially horizontal state so as to sandwich the paper 100 on the switching gate plate 63. The front surface portion 101 of the paper 100 is folded back from the second fold 112 along the surface of the upper roller 871 of the second transport roller pair 87. At this time, the distance between the switching gate plate 63 and the lowered folded plate 62 is set so that at least a gap sufficient for the paper to be conveyed is secured between the folded plate 62 and the switching gate plate 63. do. For example, a gap of about 1 mm is secured.

According to the above, since it is not necessary to provide a paper insertion space (flow distribution path) and a stopper as the paper folding mechanism, the paper folding mechanism can be easily and inexpensively configured without complicating the structure. Further, since the folding position is automatically adjusted according to various folding specifications by the control means, it is possible to provide a paper folding device having good operability. Further, it prevents wrinkles from being formed on one folded portion, and even when folding, glue does not adhere to the inside of the folding mechanism such as a stopper and adversely affect the quality of the product.

(5-4) Next, as shown in FIG. 8, after the front surface portion 101 (bottom flap) of the paper 100 is folded back by lowering the folding plate 62, the paper is further subjected to the first transfer roller pair 86. The paper tip folded portion 105 after folding the tip portion of the paper is conveyed toward the nip portion 873 of the second transport roller pair 87, and the paper tip folded portion 105 is conveyed by the nip portion 873 of the second transport roller pair 87. By sandwiching and transporting the paper in the F direction, the folded portion 105 at the tip of the paper is pressed and folded. Then, the entire front surface portion 101 is folded back and fitted to the surface of the rear surface portion 102, and at that time, both edge portions of the front surface portion 101 are joined to the single portion 103. As a result, a Western-style envelope 90 is obtained. It should be noted that the transport in the F direction is carried out until the rearmost portion 104 of the paper 100 passes through the nip portion 863 of the first transport 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, it can be reliably delivered to the pressing portion by the nip portion 873 of the second transport roller pair 87 in the next stage without wrinkles or the like.

According to the above, after folding back the tip of the paper by lowering the folded plate, the folded portion of the paper tip is pressed by the nip portion 873 of the second transport roller pair 87 to control the folding. , You can surely make a crease on the paper.

As a deliverable, this Western-style envelope 90 may be used, but by bending the Western-style envelope 90 while reversely transporting it in the F'direction, the rearmost portion 104 (top flap) becomes the rear surface portion 102 and the rearmost portion. It may be configured to be further folded at the third fold 113 which is the boundary line with 104. According to the above configuration, after inserting the contents into the envelope, when the operator seals the envelope with tape or glue, the rearmost portion 104 has a crease, so that the rearmost portion 104 is neatly placed on the folded front surface portion 101. Can be sealed. The processing method for folding the rear surface portion 104 will be described below.

(5-5) The switching gate plate 63 can be further switched upward toward the first transport roller pair 86 as the third guide position, and the first transport roller pair can be switched to. The 86 and the second transfer roller pair 87 are configured to be rotatable forward and backward.

As described above, after the second transport roller pair 87 presses the tip folded portion 105 of the paper 100 with the nip portion 873 of the second transport roller pair 87, the folded plate 62 is retracted as shown in FIG. While retracting to the position, the switching gate plate 63 is set as the third guide position and switched upward toward the first transfer roller pair 86, and then the second transfer roller pair 87 is rotated in the reverse direction to rotate the paper 100 in the reverse direction. Is conveyed in the reverse direction from the downstream side to the upstream side in the F'direction so that the rearmost portion 104 of the paper passes through the upper surface of the upper roller 861 of the first transfer roller pair 86 by a predetermined amount. When the position of the third fold 113 of the paper 100 reaches the fold position (the position directly below the end portion 622 of the folded plate 62), the transport is temporarily stopped. During this time, the folded plate 62 maintains the shelter position.

(5-6) Next, as shown in FIG. 10, the folded plate 62 moves the switching gate plate 63 to the second guide position (substantially horizontal position) while maintaining the shelter position.

(5-7) Next, as shown in FIG. 11A, the folded plate 62 arranged at the retracted position is placed in the folded position in a substantially horizontal state so as to sandwich the paper 100 on the switching gate plate 63. By lowering, the rearmost portion 104 of the paper 100 is folded back from the third crease 113 along the surface of the upper roller 861 of the second transfer roller pair 86. At this time, the distance between the switching gate plate 63 and the folded plate 62 after descending is configured so that at least a gap sufficient for transporting the paper is secured between the folded plate and the switching gate plate. .. For example, a gap of about 2 mm is secured.

FIG. 11B is a diagram schematically showing a folded state of the paper 100 in FIG. 11A. The front surface portion 101 of the paper 100 is folded from the second fold 112 onto the rear surface portion 102, and the rearmost surface portion 104 is folded back from the third fold 113.

According to the above, the work efficiency is good because the front end portion (front surface portion 101) and the rear end portion (rear end surface portion 104) can be folded back on the same folding mechanism in the paper transport direction. .. In addition, it can be configured in a small space and at low cost.

(5-8) Next, as shown in FIG. 12A, after the rearmost portion 104 of the paper 100 is folded back by lowering the folding plate 62, and further after the paper by the second transfer roller pair 87. The paper rear end folding portion 106 after the end portion is folded back is conveyed toward the nip portion 863 of the first transport roller pair 86, and the paper tip folding portion 106 is conveyed by the nip portion 863 of the first transport roller pair 86. By sandwiching and transporting a predetermined amount in the F'direction, the folded portion 106 at the tip of the paper is pressed and folded.

At this time, the support shaft 72 is rotated by a predetermined angle, and the second driven rollers 8611 and 8613 come into contact with the drive rollers 862 and are moved to a contact position where they rotate with them. (The first driven roller 8612 always abuts on the drive roller 862 and rotates with it.) Therefore, the nip portion between the first driven roller 8612 and the drive roller 862, and the second driven rollers 8611 and 8613 are driven. Both of the nip portions between the rollers 862 can uniformly press the folded rearmost portion 104 (top flap) over a wide range (at least within the envelope width range).

Then, the entire rearmost portion 104 is folded back and fitted to the surface of the rear surface portion 102, and after that, the Western envelope 90 as a finished product is installed in the downstream portion of the second folded portion 6. It is conveyed in the F direction toward.

FIG. 12B is a diagram schematically showing a folded state of the paper 100 in FIG. 12A. The front surface portion 101 of the paper 100 is folded from the second fold 112 onto the rear surface portion 102, and the rearmost side portion 104 is folded back from the third fold 113 and folded onto the rear surface portion 102. It is further folded on the portion 101.

According to the above, after the front end portion and the rear end portion of the paper 100 in the transport direction are folded back by the lowering of the folded plate 62, the paper 100 is pressed by the nip portion of the second transport roller pair 87 and the first transport roller pair 86. Since it is controlled to fold the paper, it is possible to surely make a crease on the paper.

Further, a crease processing section 2 is provided on the upstream side of the first transport roller pair 86 in the paper transport direction, and the crease processing section 2 is a crease (second crease) when the flat paper 100 is bent. Since a crease is formed in advance at 112, the third fold 113) to form a crease starting point, the crease can be folded neatly and accurately. In addition, it is possible to suppress printing cracks that occur during the folding process of the paper.

(6) Next, in the Western envelope 90 conveyed from the second folding portion 6 to the pressing portion 8, the folding portions 105 and 106 are sequentially sandwiched between the upper mold 8a and the lower mold 8b of the pressing portion 8. It is pressurized. Therefore, the folded portions 105 and 106 are strong. The Western envelope 90 after pressurization is conveyed toward the paper ejection unit 7 by the conveying roller pair 88, and is ejected onto the paper ejection tray 71.

In the present invention, as one embodiment, the paper transport device suitable for the paper folding device of the bag making machine for manufacturing envelopes has been described, but it can be applied to various machines as a simple paper transport device, and the above-mentioned It is not limited to the embodiment, and can be implemented by making various changes.

F Transport direction F'Transfer direction R Rotation direction 3 1st folding part 6 2nd folding part 10 Bag making machine 10A Device body 62 Folding plate 63 Switching gate plate 64 Drive mechanism 65 Drive mechanism 72 Support shaft 76 Hollow roller 80 Hollow roller 100 Paper 101 Front surface 102 Rear surface 103 Glue substitute piece 104 Rear side 105 Folded part 106 Folded part 111 First fold 112 Second fold 113 Third fold 861 Driven roller 862 Driven roller 8611 Second driven roller 8612 One driven roller 8613 Second driven roller

Claims (5)

In a paper transport device including a drive roller that is connected to a first drive source and rotates, and a cylindrical driven roller that is arranged so as to face the drive roller.
A first driven roller that has a support shaft that penetrates the hollow interior of the driven roller, is constantly in contact with the drive roller and rotates with it, and the support shaft is rotated at a predetermined angle on the same axis as the support shaft. A second configuration that can be selectively moved between the contact position that abuts on the drive roller and rotates with the drive roller and the retracted position that retracts by opening a predetermined gap from the drive roller. A paper transport device characterized by arranging a driven roller of the above. The second driven roller rotatably supports both ends of the second driven roller by each end support via a bearing member, and the second driven roller is supported by the end support. The first aspect of the present invention is characterized in that the support shaft located eccentrically from the center of rotation of the roller is penetrated and fixed, and both ends of the support shaft are rotatably supported by the support frame. Paper transfer device. The first driven roller is arranged between the outer peripheral surface of the support shaft and the inner peripheral surface of the first driven roller, and rotatably supports the first driven roller with respect to the support shaft. The paper transport device according to claim 1 or 2, further comprising a bearing member. By connecting the second drive source to the support shaft and rotating the support shaft at a predetermined angle by the second drive source, the second driven roller is selectively set to the contact position and the retracted position. The paper transport device according to any one of claims 1 to 3, further comprising a control means for moving the paper to the paper. The paper folding device according to any one of claims 1 to 4, wherein the paper folding device is a paper folding device that bends flat paper while transporting it along a paper transport surface. At least, a glue applying portion for applying glue to a predetermined portion of the conveyed paper and a paper folding portion for bending a predetermined portion of the conveyed paper are further provided, and the second driven roller is provided during the paper conveying. However, the paper folding device is provided with a control means for moving the second driven roller to the retracted position when the glue directly interferes with the glue-applied portion on the paper to which the glue is applied.

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