Sheet conveying method, conveying device, and bag making machine

Abstract

To provide a sheet conveying method and conveying device capable of properly conveying a folded sheet.SOLUTION: A conveying device comprises: a conveying unit 73 that conveys a folded sheet; a discharge unit 88 that is installed on an upstream side of the conveying unit 73 for discharging the sheet to the conveying unit 73; and an angle adjusting unit 79 for adjusting an angle of a conveying surface 201 of the sheet of the conveying unit 73. In the above configuration, the angle adjusting unit 79 comprises a folding adjustment unit 96 that adjusts the angle of the conveying surface 201 according to a folded state of the sheet when the sheet folded at a fold set in a direction intersecting the conveying direction of the conveying unit 73 is discharged to the conveying unit 73 by the discharging unit 88. The folding adjustment unit 96 comprises a tilting unit 97 for tilting the conveying surface 201 at a predetermined angle when the folded sheet is discharged by the discharging unit 88 along the conveying direction of the conveying unit 73 with the fold as a top.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a sheet conveying method, a sheet conveying device, and a bag making machine. [Background technology]

[0002] Conventionally, a sealing device that folds a flap while moving an envelope along a predetermined transport path is known. The following Patent Document 1 discloses a sealing device in which an envelope with an adhesive film attached is transported to a flap pressing mechanism, and the flap of the envelope is folded by a rotating folding plate. The flap is pressed against the envelope body to seal it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-240628 Summary of the Invention [Problem to be solved by the invention]

[0004] In the sealing device described in the above Patent Document 1, only the flaps need to be folded and sealed. On the other hand, in a bag making machine that folds a sheet that has been punched into a specific shape and applies glue to produce envelopes, the edge of the folded sheet may interfere with other envelopes during the sheet transport, causing a jam.

[0005] An object of the present invention is to provide a sheet conveying method and conveying device capable of properly conveying a folded sheet. [Means for solving the problem]

[0006] In order to achieve the above object, a conveying device according to the present invention includes a conveying section that conveys a folded sheet, a discharge section that is installed upstream of the conveying section and discharges the sheet to the conveying section, and a conveying section that adjusts an angle of a conveying surface of the sheet of the conveying section. To avoid interference between the preceding and succeeding sheets, and an angle adjustment section for adjusting the angle.

[0007] In addition, in the above configuration, the angle adjustment unit is provided with a folding adjustment unit that adjusts the angle of the conveying surface depending on the folding state of the sheet when the sheet folded at a crease set in a direction intersecting the conveying direction of the conveying unit is discharged to the conveying unit by the discharge unit.

[0008] In the above configuration, the folding adjustment unit is provided with a tilting unit that tilts the conveying surface by a predetermined angle when the folded sheet is discharged by the discharge unit along the conveying direction of the conveying unit, with the fold at the leading edge.

[0009] The conveying device according to the present invention includes a conveying section that conveys a folded sheet, a discharge section that is installed upstream of the conveying section and discharges the sheet to the conveying section, and an angle adjustment section that adjusts an angle of a conveying surface of the sheet in the conveying section, the angle adjustment section including a fold adjustment section that adjusts the angle of the conveying surface in accordance with a folding state of the sheet when the sheet is folded at a fold set in a direction intersecting the conveying direction of the conveying section and discharged to the conveying section by the discharge section, The folding adjustment section includes a flattening section that flattens the conveying surface along a horizontal direction when the sheet, which has been folded and has a first fold formed thereon, is discharged by the discharge section by a predetermined amount along the conveying direction of the conveying section, starting from the first fold, and then the sheet is caused to run in the opposite direction toward the upstream side to form a second fold.

[0010] Furthermore, in each of the above configurations, a stacking section for stacking a plurality of the sheets vertically is provided downstream of the conveying section.

[0011] The bag making machine of the present invention includes a conveying device as described in each of the above configurations, a folding section that folds the sheet and is provided upstream of the conveying section, and a glue application section that applies glue to a predetermined position of the sheet along the conveying direction of the sheet.

[0012] The sheet conveying method according to the present invention is a method for conveying a folded sheet by a conveying section, in which when the sheet is discharged from a discharge section disposed upstream of the conveying section toward the conveying section, an angle of the conveying surface of the sheet is changed according to a folding state of the sheet. To avoid interference between the preceding and succeeding sheets, The sheet is transported by the adjusted transport section.

[0013] In addition, in the above configuration, the sheet is folded along a crease that is set in a direction that intersects with the conveying direction of the conveying section, and the crease is formed, and when the sheet is discharged by the discharge section along the conveying direction of the conveying section with the crease as the leading edge, the conveying surface is tilted at a predetermined angle.

[0014] A sheet conveying method according to the present invention is a method for conveying a folded sheet by a conveying unit, comprising the steps of: when discharging the sheet from a discharge unit disposed upstream of the conveying unit toward the conveying unit, conveying the sheet by the conveying unit in which an angle of a conveying surface of the sheet is adjusted according to a folding state of the sheet; The sheet is folded and a first fold is formed, and a predetermined amount of the sheet is discharged by the discharge section along the conveying direction of the conveying section, starting with the first fold as the leading edge. When the sheet is then caused to run in the opposite direction toward the upstream side to form a second fold, the conveying surface is caused to lie flat along the horizontal direction.

[0015] Furthermore, in each of the above configurations, the sheets conveyed from the conveying section are stacked vertically on a stacking section provided downstream of the conveying section.

[0016] The bag making method of the present invention applies glue to a predetermined position of a sheet along the sheet transport direction in a glue application section, folds the sheet in a folding section, and transports the glue-coated, folded sheet through each of the above processes. Effect of the Invention

[0017] According to the present invention, a sheet conveying unit that conveys a folded sheet, a discharge unit that is installed on the upstream side of the conveying unit and discharges the sheet to the conveying unit, and a conveying surface of the sheet conveying unit that is angled to the conveying surface of the sheet conveying unit are provided. To avoid interference between the preceding and succeeding sheets, Since the device is provided with an angle adjustment section for adjusting the angle, when the preceding sheet and the succeeding sheet interfere with each other due to the folding of the sheets and there is a risk of a jam, the angle of the conveying surface can be adjusted to avoid the interference and the sheets can be conveyed properly.

[0018] In addition, if the angle adjustment unit is equipped with a folding adjustment unit that adjusts the angle of the conveying surface depending on the folding state of the sheet when the sheet folded at a crease set in a direction intersecting the conveying direction of the conveying unit is discharged to the conveying unit by the discharge unit, when the sheet is folded in a direction intersecting the conveying direction and an end of the sheet interferes with another sheet, the angle of the conveying surface can be adjusted by the folding adjustment unit, and the sheet can be conveyed properly.

[0019] When the folding adjustment unit is equipped with a tilting unit that tilts the conveying surface at a predetermined angle when the folded sheet is discharged by the discharge unit along the conveying direction of the conveying unit with the fold at the leading edge, the conveying surface can be tilted by the tilting unit, so that the preceding sheet can be conveyed downstream at a position lower than the discharge height of the discharge unit, thereby making it possible to avoid interference with the subsequent sheet being discharged.

[0020] The conveying device according to the present invention includes a conveying section that conveys a folded sheet, a discharge section that is installed upstream of the conveying section and discharges the sheet to the conveying section, and an angle adjustment section that adjusts an angle of a conveying surface of the sheet in the conveying section, the angle adjustment section including a fold adjustment section that adjusts the angle of the conveying surface in accordance with a folding state of the sheet when the sheet is folded at a fold set in a direction intersecting the conveying direction of the conveying section and discharged to the conveying section by the discharge section, When the folding adjustment section is provided with a flattening section that flattens the conveying surface along the horizontal direction when the sheet, which has been folded and has a first fold formed thereon, is discharged by the discharge section in a predetermined amount along the conveying direction of the conveying section, starting with the first fold as the leading edge, and then the sheet is caused to run in reverse toward the upstream side to form a second fold, it is possible to avoid a jam occurring when the sheet is caused to run in reverse to be folded at the second fold, as the end of the sheet folded at the first fold interferes with the discharge section and is not conveyed properly.

[0021] Furthermore, when a stacking section for stacking a plurality of sheets vertically is provided downstream of the conveying section, the folded sheets can be stacked appropriately vertically.

[0022] The bag making machine of the present invention is equipped with a folding section that folds the sheet, which is provided upstream of the conveying section, and a glue application section that applies glue to a predetermined position of the sheet along the conveying direction of the sheet, and a conveying device of each of the above-mentioned configurations, so that the sheet is folded in the folding section, glue is applied in the glue application section, and the folded sheet can be properly conveyed when an envelope is manufactured.

[0023] The sheet conveying method of the present invention is a method for conveying a folded sheet by a conveying section, and when the sheet is discharged from a discharge section disposed upstream of the conveying section toward the conveying section, an angle of the conveying surface of the sheet is changed according to a folding state of the sheet. To avoid interference between the preceding and succeeding sheets, The sheet is transported by the adjusted transport section, so when the sheet is folded and there is a risk of a jam occurring due to interference between the preceding sheet and the succeeding sheet, the angle of the transport surface can be adjusted to avoid the interference, and the sheet can be transported properly.

[0024] In addition, the crease is formed by folding the sheet at a crease set in a direction intersecting the conveying direction of the conveying section, and when the sheet is discharged by the discharge section along the conveying direction of the conveying section with the crease as the leading edge, if the conveying surface is tilted by a predetermined angle, the preceding sheet can be conveyed downstream at a position lower than the discharge height of the succeeding sheet by tilting the conveying surface.

[0025] A sheet conveying method according to the present invention is a method for conveying a folded sheet by a conveying unit, comprising the steps of: when discharging the sheet from a discharge unit disposed upstream of the conveying unit toward the conveying unit, conveying the sheet by the conveying unit in which an angle of a conveying surface of the sheet is adjusted according to a folding state of the sheet; When the sheet that has been folded and has a first fold formed is discharged by the discharge section in a predetermined amount along the conveying direction of the conveying section, starting with the first fold as the leading edge, and then the sheet is caused to run in the opposite direction toward the upstream side to form a second fold, if the conveying surface is flattened along the horizontal direction, when the sheet is caused to run in the opposite direction to be folded at the second fold, it is possible to avoid a jam occurring because the end of the sheet that has been folded at the first fold is not properly conveyed by the discharge section.

[0026] Furthermore, when the sheets conveyed from the conveying section are stacked vertically on a stacking section provided downstream of the conveying section, the folded sheets can be stacked properly.

[0027] According to the bag making method of the present invention, glue is applied to a predetermined position of the sheet along the transport direction of the sheet in the glue application section, the sheet is folded in the folding section, glue is applied by the transport method of each process, and the folded sheet is transported. Therefore, when the sheet is folded in the folding section, glue is applied in the glue application section, and an envelope is manufactured, the folded sheet can be transported properly. [Brief description of the drawings]

[0028] [Figure 1] 1 is a schematic overall configuration diagram of a bag making machine according to a first embodiment of the present invention; [Diagram 2] 2 is a plan view showing the state of a sheet processed by the bag making machine of FIG. 1. [Diagram 3] 3 is a perspective view showing the sheet 100 of FIG. 2 in a folded state. FIG. [Figure 4] FIG. 2 is a perspective view showing a supply tray and its periphery of the bag making machine. [Diagram 5] 4 as viewed from the upstream side in the transport direction. [Figure 6] FIG. 5 is a plan view of FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. [Figure 8] 3 is a diagram showing a schematic configuration of a second folding section of the bag making machine. FIG. [Figure 9] FIG. 2 is a perspective view of a conveyor of the bag making machine and its surroundings. [Figure 10] FIG. 10 is a side view of FIG. [Figure 11] FIG. 10 is a plan view of FIG. [Figure 12] 11 is a view of FIG. 10 as seen from the downstream side in the transport direction F. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. [Figure 23] FIG. [Figure 24] FIG. [Diagram 25] FIG. [Figure 26] FIG. [Figure 27] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] 1 is an overall configuration diagram of a bag making machine 10 according to one embodiment of the present invention. Bag making machine 10 includes, in an apparatus body 10A, a supply unit 1, a first crease processing unit 2, a second crease processing unit 4, a first folding unit 3, a glue application unit 5, a second folding unit 6, a pressure unit 8, and a receiving unit 7, which are arranged in this order from the upstream side to the downstream side in a conveying direction F in which a sheet 100 is conveyed by a pair of conveying rollers 81-88.

[0030] The bag making machine 10 has eight conveying roller pairs 81-88. The conveying roller pairs 81, 82, 83 are connected to a first drive unit 91 and are driven to rotate. The conveying roller pairs 84, 85 are connected to a second drive unit 92 and are driven to rotate. The conveying roller pairs 86, 87, 88 are connected to a third drive unit 93 and are driven to rotate. The conveying roller pairs 86, 87, 88 can move the sheet 100 in the reverse direction along the conveying surface 200 by the reverse rotation of the third drive unit 93.

[0031] The eight conveying roller pairs constitute a conveying surface 200 along which the sheet 100 is conveyed, and the conveying surface 200 is flush with the air supply unit 12 to the conveying roller pairs 88. In addition, sensors 23, 24, 25, 26, 27, and 28 are disposed on the conveying surface 200 along which the sheet 100 is conveyed, for example, to detect the passage of the sheet 100 at each position (detect double feeding). Each sensor is, for example, an optical transmission sensor.

[0032] A typical "Western-style envelope" has a horizontally long rectangular shape with a sealing opening formed on the long side. When making a Western-style envelope using a bag making machine 10, for example, as shown in Figure 2, glue G is applied to folded side pieces 103 on both sides of a main body 102 of a sheet 100, and a bottom piece 101 is folded and pressed against the side pieces 103.

[0033] Specifically, the bag making machine 10 produces a Western-style envelope 90 by processing a flat sheet 100 shown in Figure 2(a) as shown in Figures 2(b) and 2(c) while transporting the sheet downstream in the transport direction F.

[0034] The sheet 100 is made up of a bottom piece 101, a main body 102, side pieces 103 that protrude from both sides of the main body 102 as glue substitutes, and a flap 104. Three folds 110 are formed in the sheet 100: a vertical fold 111, and first and second folds 112 and 113. The vertical fold 111 is aligned along the conveying direction F. The first and second folds 112 and 113 are set in a direction that intersects with the conveying direction F of the sheet 100 by the conveying roller pairs 81-88. In this embodiment in particular, the first and second folds 112 and 113 are aligned along the width direction W that is perpendicular to the conveying direction F.

[0035] The sheet 100 is folded at a vertical crease 111, which is the boundary between the main body 102 and the side piece 103, into the shape shown in Fig. 2(b). Glue G is applied to the surface of the folded side piece 103. Then, the bottom piece 101 is folded along the width direction W at a first fold 112, which is the boundary between the bottom piece 101 and the main body 102, as shown in Figure 2(c). At this time, both edges of the bottom piece 101 are joined to the side pieces 103 with glue G.

[0036] The sheet 100 is transported with the bottom plate 101 on the downstream side in the transport direction F and the flap 104 on the upstream side, and is made into a bag. In the state shown in Fig. 2(c), the first fold 112 is the leading edge of the sheet 100 being transported, and an insertion slot 116 for the contents of the envelope 90, such as writing paper, various documents, advertisements, etc., is located upstream of the first fold 112 in the transport direction F.

[0037] FIG. 3(a) is a perspective view of the envelope 90 of FIG. 2(c). In the envelope 90a of FIG. 3(a), the flap 104 is not folded. If necessary, the envelope 90 may be further folded at a second fold 113, which is a boundary between the main body 102 and the flap 104, so that the flap 104 covers the main body 102, as shown in FIG. 3(b). In this case, the sheet 100 is folded at four folds 110. According to the above configuration, after inserting the contents from the insertion opening 116 of the envelope 90b, when sealing with tape or glue, the flap 104 can be neatly sealed to the folded bottom piece 101 because of the crease.

[0038] [Supply section 1] 1 includes an air supply unit 12 of an air suction belt type, an elevator type supply tray 11 that rises and falls according to the amount of sheets 100 stacked thereon, and a transport roller 81 that transports the sheets 100 sent out by the air supply unit 12 further downstream in the transport direction F. In addition, the air supply unit 12 is provided with a sensor 22 that detects that the uppermost sheet 100 of the sheets 100 stacked on the supply tray 11 has been sucked to the lower surface of the air supply unit 12, and a sensor 21 for detecting the upper limit of the sheets 100 stacked on the supply tray 11.

[0039] Fig. 4 is a perspective view of the supply tray 11 of the supply unit 1 and its surroundings, Fig. 5 is a view of Fig. 4 as seen from the upstream side in the conveying direction F, Fig. 6 is a plan view of Fig. 4, and Fig. 7 is a cross-sectional view taken along line AA in Fig. 6. The supply unit 1 includes a guide 13, a guide portion 15, and a support portion 16. The guide 13 guides the side of the sheet 100. When the side edge 114 of the sheet 100 is not formed in a straight line as in the sheet 100 shown in Fig. 2(a), the guide 13 comes into contact with the side edge 115 of the side piece 103 which is formed to have the longest length in the width direction W perpendicular to the conveying direction F of the sheet 100.

[0040] The guides 13 are placed in notches 17 provided in the supply tray 11. The guides 13 are placed so that they can approach or move away from each other in the width direction W according to the size of the sheets 100. Above and below the guides 13, endless guide belts 18 are placed, which rotate at a predetermined distance in the front and rear directions. Each guide belt 18 is stretched over a pair of left and right gears 19. The gears 19 are placed outside the left and right side plates 20. The gears 19 are rotatably supported on the side plates 20 by shaft support parts 29. The pair of upper and lower gears 19a shown on the right side in FIG. 5 are connected by a connecting part 30.

[0041] The guide 13 is composed of a left guide 131 and a right guide 132. An upper part 133 and a lower part 134 of the left guide 131 are respectively fixed to the upper and lower guide belts 18 moving behind. An upper part 135 and a lower part 136 of the right guide 132 are respectively fixed to the upper and lower guide belts 18 moving in front. The left guide 131 is fixed to the rear left part of the belt 18, and the right guide 132 is fixed to the front right part of the belt 18, and both are fixed at diagonal positions of the rotating guide belt 18.

[0042] The guide portion 15 guides the movement of the guide 13 in the width direction W. The guide portion 15 includes a guide shaft 31 and a connecting member 34. The guide shaft 31 is mounted on the left and right side plates 20. The connecting member 34 is inserted into the guide shaft 31. The connecting member 34 is connected to the upper portions of both the left and right guides 13. Thus, the guide 13 is suspended from and guided by the guide shaft 31 via the connecting member 34.

[0043] In FIG. 5, the connecting member 34a shown on the right side is provided with an operating unit 14. The operating unit 14 is provided so that an operator can manually adjust and position the position of the guide 13 in the width direction W. The operating unit 14 includes a knob 141. The operator rotates the knob 141 to switch between a state in which the guide 13 is fixed at a predetermined position in the width direction W and a state in which the guide 13 is movable in the width direction W. When the operator manually moves the operating unit 14 in the width direction W in the movable state of the guide 13, the right guide 132 moves. The upper and lower guide belts 18 move in a circle by the same distance as the movement amount of the right guide 132. The left guide 131, which is connected to a diagonal position of the belt 18 relative to the right guide 132, moves closer to and away from the right guide 132 by the same distance as the movement amount of the right guide 132.

[0044] The support portion 16 is disposed inside the pair of guides 13. The support portion 16 supports the sheet 100 from below within the notch 17 of the supply tray 11. The support portion 16 includes a support member 41, a swing shaft 42, and a negative member 43. The support member 41 is formed in a rod shape. The support member 41 is pivotally supported on the lower surface of the supply tray 11 by the swing shaft 42 so as to be freely swingable.

[0045] The left and right support members 41 are provided at their upstream ends in the conveying direction F with locking portions 40. The locking portions 40 are connected to and locked by a biasing member 43 below the supply tray 11. The both locking portions 40 are biased by the biasing member 43 in directions approaching each other.

[0046] An abutment portion 39 is provided at the downstream end of the support member 41. The abutment portion 39 contacts and abuts against the guides 13. The abutment portion 39 is biased by the biasing force of the biasing member 43 in a direction that separates the pair of guides 13 from each other. Therefore, the abutment portion 39 always contacts the inner side of the guide 13. As the guide 13 moves in the width direction W, the support member 41 swings about the swing shaft 42 as the axis. When the distance between the guides 13 increases, the distance between the left and right abutment portions 39 also increases accordingly.

[0047] The height of the upper surface of the support member 42 exposed from the cutout 17 is set to the same height as the sheet 100 placement surface of the supply tray 11. A storage portion 44 that stores the exposed portion 45 of the support member 41 from the cutout 17 is provided in the cutout 17. When the left and right guides 13 are positioned closest to each other, the support member 41c is oriented along the conveying direction F, as shown by the two-dot chain line in Figure 6, and the exposed portion 45 of the support member 41 from the cutout 17 is stored in the storage portion 44.

[0048] [First crease processing part 2] 1, the first crease processing unit 2 is composed of an upper mold having a convex upper portion and a lower mold having a concave lower portion, and is configured to form horizontal creases in a direction perpendicular to the conveying direction F of the sheet 100 as a first fold 112 and a second fold 113 of the sheet 100. A known mechanism can be used as the crease processing unit 2.

[0049] [Second crease processing part 4] 1, the second crease processing unit 4 is composed of a lower blade having a round crease blade with a convex portion formed on the outer periphery and an upper blade having a round crease blade with a concave portion formed on the outer periphery, and is installed at two locations in the width direction W perpendicular to the conveying direction F, so as to form vertical creases in the vertical folds 111 (two locations) of the sheet 100 along the conveying direction F of the sheet 100. A known mechanism can be used as the second crease processing unit 4.

[0050] [First fold 3] The first folding section 3 folds the sheet 100. The first folding section 3 is made up of a pair of folding devices (first folding device 3a, second folding device 3b) arranged opposite each other on both sides in the width direction W perpendicular to the conveying direction F of the sheet 100 as means for folding back the left and right side pieces 103 of the sheet 100. The first folding section 3 also includes an upper guide plate 36 above the lower guide plate 33 with a predetermined gap therebetween, and a pair of conveying rollers 84 (a driving roller 38 and a driven roller 35) that convey the sheet 100 conveyed on the lower guide plate 33 downstream.

[0051] [Glue application section 5] The glue application unit 5 applies glue to a predetermined position of the sheet 100 along the conveying direction F of the sheet 100. The glue application unit 5 is composed of a pair of applicators 5a and 5b arranged opposite each other on both sides in the width direction W. The applicators 5a and 5b have a symmetrical configuration.

[0052] The application devices 5a and 5b each have a nozzle section, a position setting mechanism, and a vertical drive mechanism (not shown). The nozzle section is capable of applying glue to the sheet 100 being transported at a predetermined timing.

[0053] [Second fold 6] The second folding unit 6 folds the sheet 100. The second folding unit 6 constitutes the folding unit of the present invention. The second folding unit 6 is a paper folding device that folds the flat sheet 100 while conveying it along a conveying surface 200. FIG. 8 is a diagram showing a schematic configuration of the second folding unit 6. The second folding unit 6 includes a pair of conveying rollers 86, 87, a pair of front and rear guide plates 65, a switching unit 63, and a folding guide 62.

[0054] The conveying roller pair 86 is disposed upstream in the conveying direction F of the sheet 100, and the conveying roller pair 87 is disposed downstream of the conveying roller pair 86 in the conveying direction F of the sheet 100. The guide plate 65 is erected above both upper conveying rollers 861, 871 of the conveying roller pairs 86, 87. The guide plate 65 includes a rear guide plate 66 and a front guide plate 67. The rear guide plate 66 guides upward the sheet 100 that has reached above the upper roller 861 of the conveying roller pair 86. The front guide plate 67 guides upward the sheet 100 that has reached above the upper roller 871 of the conveying roller pair 87.

[0055] The switching unit 63 is disposed between both pairs of conveying rollers 86, 87. The switching unit 63 interferes with the sheet 100 being conveyed on the conveying surface 200, and guides the front end or edge of the sheet 100 upward on the conveying surface 200. The switching unit 63 is swingable about a support shaft 631. The switching unit 63 swings between a parallel position P, a front-upward position Q, and a rear-upward position U. The parallel position P is a position that is approximately parallel to the conveying surface 200, as shown by a solid line in FIG. 8. In the parallel position P, the switching unit 63 guides the sheet 100 in an approximately horizontal direction toward a nip 873 of the front conveying roller pair 87.

[0056] The front-upward position Q is indicated by a dashed line in Fig. 8. In the front-upward position Q, the sheet 100 is inclined with respect to the conveying surface 200 so that its front portion is located above the conveying surface 200 and its rear portion is located below the conveying surface 200. In the front-upward position Q, the front end of the sheet 100 is guided above the upper roller 871 of the front conveying roller pair 87. The front end of the sheet 100 is further guided by a guide plate 67 installed above it.

[0057] The rear-upward position U is indicated by a two-dot chain line in Fig. 8. In the rear-upward position U, the edge of the sheet 100 is guided above the conveying surface 200. In the rear-upward position U, the edge of the sheet 100 is guided above the upper roller 861 of the rear conveying roller pair 86. The edge of the sheet 100 is further guided by a guide plate 66 installed above it.

[0058] The folding guide 62 is disposed above the switching unit 63. The folding guide 62 is formed in a substantially U-shape in a side view. The folding guide 62 includes an upper surface guide portion 625, a front guide portion 626, an inclined guide portion 627, and a rear guide portion 628. The upper surface guide portion 625 maintains a position substantially parallel to the conveying surface 200 and extends in the width direction W. The upper surface guide portion 625 guides the upper surface of the sheet 100. The front guide portion 626 is erected at the front end portion of the upper surface guide portion 625. The front guide portion 626 guides upward the front end portion of the sheet 100 guided above the conveying surface 200 by the switching unit 63. A front edge 621 is provided at the connection portion between the upper surface guide portion 625 and the front guide portion 626. When the folding guide 62 descends to fold the sheet 100, the front edge 6221 comes into contact with the crease 100 and acts to fold the sheet 100. When the front edge 621 comes into contact with the crease and folds the sheet 100, the front guide portion 626 guides the front part of the sheet 100 so that it is aligned in the vertical direction.

[0059] The inclined guide portion 627 is provided on the edge of the upper surface guide portion 625. The inclined guide portion 627 guides the edge of the sheet 100 from entering the gap between the upper surface guide portion 625 and the switching portion 63 when the rear portion of the sheet 100 is folded at the second fold 113 set in a direction intersecting the conveying direction F and then conveyed downstream.

[0060] Rear guide portion 628 is provided upright on the edge of inclined guide portion 627. Rear guide portion 628 guides upward the edge of sheet 100 guided above conveying surface 200 by switching portion 63. Rear guide portion 628 guides the rear portion of sheet 100 to be aligned vertically when folding guide 62 descends to fold sheet 100.

[0061] Folding guide 62 is configured to be movable in the vertical direction while maintaining a state in which upper surface guide portion 625 is aligned with conveying surface 200, which is approximately horizontal. Folding guide 62 is raised and lowered between a folding position and a retracted position. At the folding position, folding guide 62 is close to switching portion 63, which is in parallel posture P, and folds sheet 100. At the retracted position, folding guide 62 is retracted from switching portion 63 and is located at a position spaced a predetermined distance away.

[0062] [Pressure section 8] The pressure applying section 8 is composed of an upper die 8a that is movable in a width direction W perpendicular to the conveying direction F, and a lower die 8b that extends within the range of movement of the upper die 8a. As the upper die 8a moves in the width direction W, it presses the first and second folds 112, 113 of the sheet 100 that has been folded at the second folding section 6 along the first and second folds 112, 113 that are set in a direction intersecting the conveying direction F, so that the sheet 100 is folded more reliably at the first and second folds 112, 113.

[0063] [Receiving part 7] The receiving section 7 constitutes the conveying device of the present invention. The receiving section 7 includes a conveying roller pair 88, a conveyor 72, and a loading section 71. The conveying roller pair 88 constitutes the discharge section of the present invention. The conveying roller pair 88 discharges the sheet 100 onto the conveyor 72. The conveying roller pair 88 is disposed near the conveying roller pair 87 of the second folding section 6, as shown in FIG. 1. The conveying roller pair 88 is disposed downstream of the pressure section 8 in the conveying direction F. The conveying roller pair 88 is disposed upstream of the conveyor 72.

[0064] Fig. 9 is a perspective view of the conveyor 72 and its periphery, Fig. 10 is a side view of Fig. 9, Fig. 11 is a plan view of Fig. 9, and Fig. 12 is a view of Fig. 10 seen from the downstream side in the conveying direction F. The conveyor 72 includes a belt 73, rollers 77, a presser 78, a support member 76, and an angle adjustment unit 79.

[0065] The belt 73 constitutes a conveying section of the present invention. The belt 73 conveys the folded sheet 100. The conveying direction of the folded sheet 100 by the belt 73 is the same as the conveying direction F by the conveying roller pair 81-88. The height of the conveying surface 201 of the sheet 100 by the belt 73 is set to a position lower than the conveying surface 200 of the sheet 100 by the conveying roller pair 81-88. The belt 73 is formed endlessly, and is stretched over rollers 77 arranged at the front and rear of the conveying direction F of the sheet 100 at a predetermined distance.

[0066] The pair of front and rear rollers 77 is composed of a rear roller 74 and a front roller 75. The rear roller 74 is rotatably supported by the side plate 20. The rear roller 74 is connected to the fourth drive portion 94 via a connection portion 95. 9 The presser 78 is disposed above the support member 76. The presser 78 is supported by the support member 76. The presser 78 presses the sheet 100 discharged downstream on the upper surface of the belt 73 with a predetermined pressing force.

[0067] The support member 76 includes a pair of left and right side members 50 and a link 51. The side members 50 are installed on the left and right sides of the belt 73. The front end of the side member 50 rotatably supports a rear roller 74, and the end edge rotatably supports a front roller 75. A handle 49 is provided on the side member 50. The handle 49 may be provided on a vertical member 53 or a horizontal member 53 of the link member 50, which will be described later, instead of the side member 50.

[0068] The link 51 is formed in an L-shape when viewed from the side. The link 51 includes a vertical member 53 and a horizontal member 54. The upper end of the vertical member 53 is rotatably connected to the front end of the side member 50. The lower end of the vertical member 53 and the front end of the horizontal member 54 are integrally connected at a substantially right angle. An edge of the loading section 71 is connected to this connecting portion.

[0069] The end edges of the left and right cross members 54 are connected by an installation shaft 56. The installation shaft 56 protrudes outward from the cross members 54. Locking portions 57 are provided on both left and right ends of the installation shaft 56. The locking portions 57 are locked into guide holes 58 of the angle adjustment portions 79.

[0070] Angle adjustment unit 79 adjusts the installation angle of belt 73. Thus, angle adjustment unit 79 adjusts the angle of conveyance surface 201 of sheet 100 by belt 73. Angle adjustment unit 79 includes a folding adjustment unit 96. When sheet 100 folded in a direction intersecting conveyance direction F of belt 73 as a conveyance unit is discharged to belt 73 by a pair of conveyance rollers 88 as a discharge unit, folding adjustment unit 96 adjusts the angle of conveyance surface 201 according to the folding state of sheet 100.

[0071] The folding adjustment unit 96 includes a tilting unit 97 and a flattening unit 98. The tilting unit 97 tilts the conveying surface 201 by a predetermined angle when the folded sheet 100 is discharged along the conveying direction F of the belt 73 as a conveying unit by the conveying roller pair 88 as a discharge unit with the first fold 112 at the front. The flattening unit 98 flattens the conveying surface 201 to be flat along the horizontal direction when the sheet 100 is made to travel in the opposite direction toward the upstream side to form the second fold 113 after the folded sheet 100 on which the first fold 112 has been formed is discharged by a predetermined amount along the conveying direction F of the belt 73 as a conveying unit by the conveying roller pair 88 as a discharge unit with the first fold 112 at the front.

[0072] The angle adjustment portion 79 includes a guide hole 58. The guide hole 58 guides the locking portion 57 and sets the conveying surface 201 at a plurality of angles. The guide hole 58 includes a horizontal guide portion 580, 1-3 guide portions 581-583, and a storage guide portion 584. The horizontal guide portion 580 locks the locking portion 57 so that the conveying surface 201 of the sheet 100 by the belt 73 is aligned horizontally. The 1-3 guide portions 581-583 lock the locking portion 57 so that the conveying surface 201 of the sheet 100 is at three different angles. The storage guide portion 584 guides the locking portion 57 so that the conveyor 72 is folded when the device is stored.

[0073] The stacking section 71 is installed downstream of the belt 73 as a conveying section. The stacking section 71 stacks a plurality of sheets 100 vertically. The stacking section 71 includes a stacking tray 70. The stacking tray 70 is installed at a position lower than a conveying surface 201 of the belt 73 for the sheets 100, and extends forward. The stacking section 71 maintains a substantially horizontal position or a position in which the front end is slightly higher than the edge. When stored, the stacking section 71 is swung relative to the support member 76, tilted vertically, and hung down from the support member 76.

[0074] A pair of upper and lower guides 89 are provided downstream of the pair of conveying rollers 88 to guide the sheet 100 on the conveying surface 200. The upstream ends and, if necessary, the downstream ends of both guides 89 are wide and tapered in side view. The sheet 100 is inserted between both guides 89.

[0075] Next, the operation of the bag making machine 10 having the above-mentioned configuration will be described. The worker loosens the knob 141 to make the guide 13 movable in the width direction W. The worker places multiple sheets 100 on the supply tray 11 with the bottom piece 101 facing downstream in the conveying direction F and the flap 104 facing upstream in the conveying direction F. The worker then positions the guide 13 in a position to abut against both left and right side edges 115 of the side pieces 103 of the sheets 100 according to the size of the sheets 100.

[0076] The left and right guides 13 have both upper ends 133, 135 and lower ends 134, 136 fixed to predetermined positions on the guide belt 18, so they are properly erected along the vertical direction and are less likely to tilt, compared to when only one of the upper ends 133, 135 and lower ends 134, 136 is fixed. The guides 13 extend in the vertical direction and can properly guide the side edges 115 of the sheet 100.

[0077] The support member 41 swings about the swing shaft 42 as the guide 13 moves in the width direction W. In this manner, since the support portion 16 is provided in the notch 17, even if the notch 17 is formed in the supply tray 11, the sheet 100 can be supported in the notch 17 by the support portion 16. The sheet 100 can be prevented from sagging inward of the notch 17, and the sheet 100 can be properly conveyed.

[0078] The support member 41 oscillates about an oscillating shaft 42 located at the center of the supply tray 11 in the conveying direction F, so that when a sheet 100 punched into the shape shown in Figure 2(a) is placed on the supply tray 11, the support portion 16 can be positioned on the side piece 103.

[0079] 13, as the size of the sheet 100 increases, the length in both the conveying direction F and the width direction W tends to increase. When placing a large-sized sheet 100L, the distance of the guide 13 needs to be longer than when placing a small-sized sheet 100S. At this time, the contact portion 39 of the support member 41 swings about the swing shaft 42 while abutting against the guide 13 as the guide 13 moves outward in the left-right width direction W, and moves further rearward than when a small-sized sheet 100S is placed.

[0080] The length of the bottom piece 101 of the large-sized sheet 100L in the conveying direction F is usually longer than that of the small-sized sheet 100S. The side piece 103 of the large-sized sheet 100L placed on the supply tray 11 is located behind the side piece 103 of the small-sized sheet 100S. The movement of the contact portion 39 accompanying the movement of the guide 13 corresponds to the change in the position of the side piece 103 of the sheet 100. The side piece 103 that is likely to fall inward of the notch 17 can be supported by the contact portion 39 that has moved to the opposing position. In this way, even when a plurality of types of sheets 100 with different lengths in the width direction W are supplied, the position corresponding to the side piece 103 of the sheet 100 can be properly supported from below by the support portion 16.

[0081] When an operator performs an operation to start the operation of the bag making machine 10, the bag making machine 10 operates as follows. (1) The top sheet 100 on the supply tray 11 is sent toward the pair of conveying rollers 81 while being attracted to the air suction belt of the air supply unit 12, and after the sheet 100 is handed over to the pair of conveying rollers 81, the pair of conveying rollers 81 conveys the sheet 100 further downstream in the conveying direction F. The sheet then passes through the first crease processing unit 2. At that time, the first crease processing unit 2 operates to form creases at the first fold 112 and the second fold 113 of the sheet 100. This makes it easier for the bottom piece 101 to be folded back toward the main body 102. Also, the flap 104 makes it easier for the sheet 104 to be folded back toward the folded bottom piece 101.

[0082] (2) The sheet 100 conveyed from the first crease processing unit 2 passes through the second crease processing unit 4. At this time, the vertical folds 111 (two places on the left and right in the width direction W) of the sheet 100 are located directly under the crease blades (round blades) of the second crease processing unit 4 installed at two places in the width direction W perpendicular to the conveyance direction F. Then, the second crease processing unit 4 operates to form a crease in the vertical fold 111. This makes it easier for the side pieces 103 (two places on the left and right in the width direction W) to be folded inward.

[0083] (3) The sheet 100 with the crease formed by the second crease processing unit 4 stops at the first folding unit 3. By forming a crease in advance at the vertical fold 111 when folding the side piece 103 of the sheet 100, it is possible to ensure the accuracy of the crease processing position when folding the flap.

[0084] 5, the first folding section 3 includes, in addition to the basic configuration of folding back the side piece 103 by the folding plate 32, an upper guide plate 36 installed 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) that convey the sheet 100 conveyed on the lower guide plate 33 further downstream, as shown in FIG. 5. Note that the lower guide plate 33 has a notch formed at the nip of the pair of conveying rollers.

[0085] figure 14 In (a), the folding plates 32 of the folding device 3a (3b) of the first folding section 3 are positioned outside in the width direction W, and both side pieces 103 of the sheet 100 are placed on the folding plates 32 (placement position).

[0086] Next, in FIG. 14(b), the folding plate 32 is guided by the inner lower guide plate 33. fart 1, the side piece 103 is folded inward at the creased vertical fold 111, as shown in FIG. 14 As shown in (c), it is superimposed on the main body 102 via the upper guide plate 36 (superimposed position).

[0087] 14(d), the folding plate 32 rotates in a direction away from the outer lower guide plate 33. Then, the sheet 100 with the side piece 103 folded is transported downstream in the transport direction F by the transport roller pair (drive roller 38 and driven roller 35). By rotating the folding plate 32 at least by a predetermined angle in a direction away from the lower guide plate 33 before starting the transport of the sheet 100, the folded sheet 100 can be smoothly transported downstream in the transport direction F of the sheet 100 at the folding position without being interfered with by the folding plate or the pair of upper and lower guide plates.

[0088] In the above-mentioned Figures 14(a) to 14(d), an upper guide plate 36 and a driven roller 35 that holds the sheet 100 on the upper guide plate 36 are provided, and when the folding means folds the side piece 103 of the sheet 100, the control device stops driving the pair of conveying rollers (drive roller 38 and driven roller 35) at the folding position to stop the conveyance of the sheet 100, and controls the side piece 103 of the sheet 100 to be folded while the main body 102 of the sheet 100 is held between the pair of conveying rollers 38, 35.

[0089] According to the above, while the main body 102 of the sheet 100 is held between the pair of upper and lower guide plates 36, 33, the side piece 103 of the sheet 100 is folded onto the upper surface of the upper guide plate 36, and at the same time, while the main body 102 of the sheet 100 is held between the pair of conveyor rollers 36, 33, the side piece 103 of the sheet 100 is folded. Therefore, it is possible to further ensure the accuracy of the fold position when folding the side piece 103.

[0090] (4) The sheet 100 with the side pieces 103 folded is transported downstream in the transport direction F by the transport roller pair 85 and passes through the glue coating unit 5. In the glue coating unit 5, when the folded side pieces 103 of the sheet 100 start to pass, the nozzle parts 5a and 5b installed at the positions in the width direction W2 perpendicular to the transport direction F move downward and come into contact with the surfaces of the side pieces 103, and when the passage of the side pieces 103 ends, the nozzle parts 5a and 5b move upward and separate from the surfaces of the side pieces 103. As a result, glue is applied to the surfaces of the folded side pieces 103. The folded side pieces 103 pass through the nozzle parts 5a and 5b while being pressed by the transport roller pair 85 located upstream of the nozzle parts 5a and 5b in the transport direction F, or after being pressed by them. Therefore, the glue application work by the nozzle parts 5a and 5b can be performed stably.

[0091] (5) The sheet 100 with the glue applied to the side piece 103 is transported to the second folding section 6 by the transport roller pair 85. The upper roller 861 of the transport roller pair 86 is set to a width dimension such that it does not contact the surface of the side piece 103. Therefore, the glue applied to the side piece 103 of the sheet 100 does not adhere to the transport roller pair 86 in the glue application section 5 described above.

[0092] The switching unit 63 is set to a front-upward position Q in which the front is inclined upward. Therefore, as shown in Fig. 15, the sheet 100 is guided upward by the switching unit 63 so that the edge 118 of the sheet 100 passes over the surface of the upper roller 871 of the pair of conveying rollers 87, and is inserted between the front guide plate 67 and the front guide unit 626. When the first fold 112 of the sheet 100 reaches the position of the front edge 621, the control device stops the third drive unit 93. The conveyance of the sheet 100 is temporarily stopped. During this time, the fold guide 62 maintains the retreated position.

[0093] As shown in FIG. 16, the folding guide 62 is maintained in the retreated position, and the switching portion 63 is switched to a parallel position P parallel to the conveying direction F.

[0094] Then, the folding guide 62 is lowered from the retracted position to the folding position while maintaining that posture. As shown in Fig. 17, the sheet 100 on the switching section 63 is sandwiched between the switching section 63 and the top surface guide section 625. The bottom piece 101 of the sheet 100 extends vertically between the rear part of the upper roller 871 and the front guide section 626. The first fold 112 is brought into contact with the front edge 621, pressed, and folded.

[0095] At this time, the distance between the switching portion 63 and the upper surface guide portion 625 of the lowered folding guide 62 is at least a predetermined distance that allows the sheet 100 to pass between the switching portion 63 and the upper surface guide portion 625. For example, a gap of about 1 mm is secured.

[0096] After folding the bottom piece 101 of the sheet 100 by lowering the folding guide 62, the control device drives the third drive unit 93. The sheet 100 is conveyed by the conveying roller pair 86 toward the nip 873 of the downstream conveying roller pair 87. The first fold 112 is sandwiched in the nip 873 of the conveying roller pair 87, so that the sheet 100 is folded at the first fold 112.

[0097] 18, the sheet 100 is conveyed by the conveying roller pair 87 while the bottom piece 101 is successively overlapped on the main body 102. Both side ends in the width direction W of the bottom piece 101 are overlapped on the side pieces 103 folded inward, and are joined to the side pieces 103 by applied glue. In this way, a Western-style envelope 90 is obtained.

[0098] When the sheet 100 is loaded on the stacker 71 with the flap 104 unfolded, the sheet 100 is transported to the pressurizing unit 8 by the transport roller pair 87. When the first fold 112 reaches the pressurizing unit 8, the control device stops the third drive unit 93. This stops the transport of the sheet 100, and the control device moves the upper die 8a in the width direction W to pressurize the first fold 112. The sheet 100 is folded more reliably at the first fold 112.

[0099] Thereafter, the sheet 100 is discharged onto the conveyor 72 by the conveying roller pair 88. The control device controls the driving of the third and fourth drive units 93, 94 so that the multiple sheets 100 are discharged in a stacked state, shifted by a predetermined amount on the conveyor 72. The conveying roller pair 88 and the conveyor 72 adjust the timing at which the sheets 100 are discharged and the distance that the belt 73 travels.

[0100] The control device also controls the third drive unit 93, and when the sheet 100 is discharged from a pair of conveying rollers 88 serving as an ejection unit installed upstream of the belt 73 serving as a conveying unit toward the belt 73 serving as a conveying unit, the sheet 100 is conveyed by the belt 73 serving as a conveying unit in which the angle of the conveying surface 201 of the sheet 100 is adjusted according to the folding state of the sheet 100.

[0101] Because bottom piece 101 is folded at crease 110 set in a direction intersecting conveyance direction F, edge 118 of bottom piece 101 of sheet 100, which becomes envelope insertion opening 116, is located upstream of first crease 112 when sheet 100 is conveyed by belt 73. In this case, as shown in Fig. 19, first crease 112b, which is the leading portion of succeeding sheet 100b, may collide with edge 118 of bottom piece 101 of preceding sheet 100a, causing a jam.

[0102] Then, the sheet 100 is folded in a direction intersecting the conveying direction F of the belt 73 as a conveying section to form a fold 110, and when the sheet 100 is discharged from the fold 110 along the conveying direction F of the belt 73 as a conveying section by the conveying roller pair 88 as a discharge section, the conveying surface 201 of the sheet 100 is tilted at a predetermined angle. For this reason, the operator manually tilts the conveyor 72. As shown in FIG. 20, the conveying surface 201 of the sheet 100 on the locking section belt 73 is tilted at a predetermined angle. The edge 118 of the bottom piece 101 is positioned lower than the discharge height of the conveying roller pair 88, and is less likely to interfere with the first fold 112b of the following sheet 100b. Therefore, as shown in FIG. 21, the sheets 100 can be conveyed by overlapping them in a predetermined amount in sequence. The sheets 100 on the conveyor 72 are conveyed to the stacking section 71. Then, the sheets are stacked in the stacking tray 70 in a vertically aligned manner.

[0103] When the flap 104 is folded and loaded on the loading section 71, after the first fold 112 in FIG. 17 is formed, the sheet 100 is transported downstream in the transport direction F by the transport roller pairs 86, 87, and 88 as shown in FIG. 18. When the edge 117 of the flap 104 of the sheet 100 passes through the nip 863 of the transport roller pair 86 and is transported further downstream by about the radius of the upper roller 861, the control device stops the third drive unit 93. This stops the transport of the sheet 100. The flap 104 is sandwiched between the upper guide portion 625 of the folding guide 62 and the switching portion 63. Meanwhile, the bottom piece 101 and the main body 102 are nipped by the transport roller pair 87 and the downstream transport roller pair 88.

[0104] Thereafter, the control device raises the folding guide 62 and switches the switching unit 63 to a rear-upward position U. The switching unit 63 is inclined so that its rear end is above the conveying surface 200 of the sheet 100 and its front end is below the conveying surface 200. Then, the control device controls the third drive unit 93 to rotate the conveying roller pairs 86, 87, and 88 in the reverse direction, and conveys the sheet 100 toward the upstream side in the opposite direction to the conveying direction F.

[0105] When the size of the flap 104 is equal to or larger than a predetermined value and the distance between the second folding section 6 and the pair of conveying rollers 88 as the discharge section is equal to or smaller than a predetermined value, when the sheet 100 travels in the reverse direction to be folded at the second fold 113, the bottom piece 101 passes through the nip 883 of the pair of conveying rollers 88, and the edge 118 of the bottom piece 103 may be located downstream of the nip 883 of the pair of conveying rollers 88. At this time, if the conveying surface 201 of the belt 73 for the sheet 100 is inclined as in the case where the flap 104 is not folded, the downstream portion of the sheet 100 in the conveying direction F is likely to sag toward the lowered conveying surface 201 of the belt 73, as shown in FIG. 21. The bottom piece 101 separates from the main body 102, and the edge 118 of the bottom piece 101 separates from the main body 102, opening the insertion opening 116 for the contents.

[0106] In this state, if the sheet 100 is reversed to fold the sheet 100 at the second fold 113, the edge 118 of the bottom piece 101 will not be properly inserted into the nip 883 of the conveying roller pair 88, which may cause a jam.

[0107] Therefore, when a predetermined amount of sheet 100 that has already been folded in this manner and has first fold 112 formed thereon is discharged, starting with first fold 112 at the front, along the conveying direction F of belt 73 as a conveying section by conveying roller pair 88 as a discharge section, and then sheet 100 is caused to run in the opposite direction upstream to form second fold 113, the occurrence of jams can be prevented by laying conveying surface 201 of sheet 100 on belt 73 flat along the horizontal direction.

[0108] Therefore, the operator manually adjusts the angle of the belt 73 using the angle adjustment unit 79. The operator positions the locking unit 57 at the horizontal guide unit 580. Then, the belt 73 is placed in a lying position by the lying portion 98. As a result, as shown in FIG. 22, the conveying surface 201 of the belt 73 is aligned substantially horizontally. The first fold 112 is supported from below by the belt 73 at a position higher than when the belt 73 is inclined and close to the discharge height of the conveying roller pair 88. In this state, when the control device reverses the conveying roller pair 88, the edge 118 of the bottom piece 101 can be inserted together with the main body 102 into the nip 883 of the conveying roller pair 88, and the sheet 100 can be conveyed appropriately.

[0109] As shown in FIG. 24, the edge 117 of the flap 104 is guided by the switching unit 63 and transported upward from the front surface of the upper roller 861. It is further guided by the guide plate 66 above the upper roller 861 and the rear guide unit 628 of the folding guide 62, and reaches above the upper roller 861. When the second fold 113 reaches a position where the inclined guide unit 627 of the folding guide 62 is located, the control device stops the third drive unit 93 and stops the transport of the sheet 100. The control device swings the switching unit 63 to the parallel position P and lowers the folding guide 62. As a result, the sheet 100 is folded at the second fold 113, as shown in FIG. 25.

[0110] Then, the control device reversely rotates the third drive unit 93, thereby reversely rotating the conveying roller pairs 86, 87, and 88. The sheet 100 is fed in reverse, with the second fold 113 at the front, toward the nip 863 of the conveying roller pair 86. The second fold 113 is sandwiched in the nip 863 of the conveying roller pair 86, so that the sheet 100 is folded at the second fold 113.

[0111] The flap 104 is guided by the guide plate 66 and the rear guide portion 828 of the folding guide 62, and is successively drawn into and sandwiched in the nip 863 by the reverse movement of the conveying roller pair 86. When the edge 117 of the flap 104 passes in front of the upper roller 891 and reaches the vicinity of the nip 863 of the conveying roller pair 86, the control device stops the third drive unit 93 and stops conveying the sheet 100 upstream. Thereafter, the control device switches the third drive unit 93 to the forward direction and drives it. The conveying roller pairs 86, 87, and 88 rotate in the forward direction to convey the sheet 100 downstream in the conveying direction F.

[0112] The edge 117 of the flap 104 is guided by the inclined guide portion 627 and inserted between the switching portion 63 and the upper surface guide portion 625. The sheet 100 is conveyed downstream in the conveying direction F while being guided by both the switching portion 63 in the parallel position P and the upper surface guide portion 62 through the gap between them. This allows the sheet 100 to be reliably delivered to the pressing portion by the nip 873 of the next conveying roller pair 87 without wrinkles or the like being generated.

[0113] When the second fold 113 reaches the pressure unit 8, the control device stops the third drive unit 93. The control device moves the upper die 8a in the width direction W to apply pressure to the second fold 113.

[0114] The control device drives the third drive unit 93, whereby the sheet 100 is discharged onto the upper surface of the conveyor 72 by the conveying roller pair 88. As in the case where the flap 104 is not folded, the sheet 100 is shifted by a predetermined amount on the conveyor 72 and sequentially conveyed downstream in a stacked state, as shown in FIG.

[0115] 26, bottom piece 101 is also folded at first fold 111, which is fold 110 set in a direction intersecting conveyance direction F, so that edge 118 of bottom piece 101, which becomes insertion opening 116 for envelope 90, is located upstream of first fold 112. However, because flap 104 is folded and placed over bottom piece 102, there is no problem of first fold 112b, which is the leading portion of trailing sheet 100b, colliding with edge 118 of bottom piece 101 of leading sheet 100a, as shown in FIG.

[0116] In the case of folding the flap 104 shown in FIG. 27, when the succeeding sheet 100b is discharged by the conveying roller pair 88, the first fold 112b of the succeeding sheet 100b interferes with the flap 104a of the preceding sheet 100a. The succeeding sheet 100b is conveyed while the lower surface of the body 102b of the succeeding sheet 100b contacts the upper surface of the flap 104a of the preceding sheet 100a stopped on the belt 73. The succeeding sheet 100b is discharged while pressing the flap 104a of the preceding sheet 100a against the bottom piece 101a. In this way, when folding the flap 104, the belt 73 is made to lie flat, so that the multiple sheets 100a, 100b can be conveyed appropriately in a state where they are shifted by a predetermined amount and overlapped.

[0117] The sheets 100 on the conveyor 72 are transported to a stacking section 71. Then, the sheets 100 are stacked on a stacking tray 70 in a vertically aligned state.

[0118] As described above, the conveying device of this embodiment includes belt 73 as a conveying section that conveys a folded sheet, a pair of conveying rollers 88 that is installed upstream of belt 73 and serves as a discharge section that discharges sheet 100 onto belt 73, and an angle adjustment section 79 that adjusts the angle of conveying surface 201 of sheet 100 on belt 73.Therefore, when sheet 100 is folded and there is a risk of a jam occurring due to interference between leading sheet 100a and trailing sheet 100b, the angle of conveying surface 201 can be adjusted to avoid the interference, and sheet 100 can be conveyed properly.

[0119] In addition, the angle adjustment unit 79 is equipped with a folding adjustment unit that adjusts the angle of the conveying surface 201 depending on the folding state of the sheet 100 when the sheet 100 folded at the fold 110 set in a direction intersecting the conveying direction F of the belt 73 as a conveying unit is discharged onto the belt 73 by the pair of conveying rollers 88 as a discharge unit. Therefore, when the end of the folded piece of the sheet 100 interferes with another sheet 100 due to being folded in a direction intersecting the conveying direction F, the angle of the conveying surface 201 can be adjusted by the folding adjustment unit 96.

[0120] The folding adjustment unit 96 is provided with a tilting unit 97 that tilts the conveying surface 201 at a predetermined angle when the folded sheet 100 is discharged, with the fold 110 at the leading edge, along the conveying direction F of the belt 73 as a conveying unit by the pair of conveying rollers 88 as a discharge unit. By tilting the conveying surface 201 by the tilting unit 97, the preceding sheet 100a can be conveyed downstream at a position lower than the discharge height of the pair of conveying rollers 88, and interference with the subsequent sheet 100b discharged by the pair of conveying rollers 88 can be avoided.

[0121] Furthermore, when the folding adjustment section 96 reverses the conveying surface to lie flat along the horizontal direction after the sheet 100, which has been folded and has the first fold 112 formed, is discharged by a predetermined amount along the conveying direction F of the belt 73 as a conveying section, with the first fold 112 at the front, by the pair of conveying rollers 88 as a discharge section, the sheet is then caused to run upstream to form the second fold 113.Therefore, when the sheet 100 is reversed to be folded at the second fold 113, the end of the sheet 100 folded at the first fold 112 does not interfere with the pair of conveying rollers 88, preventing the sheet from being properly conveyed, thereby preventing a jam from occurring.

[0122] Furthermore, since the stacking section 71 for stacking a plurality of sheets 100 vertically is provided downstream of the pair of transport rollers 88 as a transport section, the folded sheets can be stacked on the stacking section 71 appropriately.

[0123] Furthermore, the bag making machine of this embodiment is equipped with folding units 3, 6 that fold sheet 100 and are provided upstream of belt 72 as a conveying unit, glue application unit 5 that applies glue to a predetermined position on the sheet along the sheet conveying direction, and conveyor 72 as a conveying device, so that when sheet 100 is folded in folding units 3, 6 and glue is applied in glue application unit 5 to produce an envelope, the folded sheet 100 can be properly conveyed.

[0124] The bag making machine further comprises a folding unit that folds the sheet and is provided upstream of the conveying unit, a glue application unit that applies glue to a predetermined position of the sheet along the conveying direction of the sheet, and the conveying device described in any one of claims 1 to 5.

[0125] In the above embodiment, the conveyor 72 as a transport device is installed in the receiving section 7 of the bag making machine 10, but the present invention is not limited to this and may be a device without a folding section or a glue application section. Therefore, for example, the conveyor 72 may be a device that transports sheets manually folded by an operator, or may be installed in a paper folding machine equipped with a folding section that automatically folds cards, letter paper, paper, etc., and transports the folded sheets.

[0126] In addition, the angle adjustment unit 79 includes the folding adjustment unit 96, but the direction in which the sheet is folded may be parallel to the conveying direction. When there is a risk that a sheet folded with a crease parallel to the conveying direction may interfere with the front and rear sheets, the sheet can be conveyed appropriately by adjusting the angle of the conveying surface of the sheet. In addition, the conveying unit is configured with the belt 73 stretched between the front and rear rollers 74, 75, but is not limited to this and may be configured with one or more rollers, and may include a guide to guide the conveyance of the sheet as necessary.

[0127] The conveying surface of the sheet may be inclined upwards. In this way, the leading edge of the folded sheet is pressed against other parts of the sheet while being conveyed, so that the sheet is prevented from being pulled by rollers or other sheets. and interference In addition, only one of the inclined portion and the protruding portion may be provided.

[0128] The receiving unit 7 is provided with a loading unit 71 downstream of the belt 73 as a conveying unit, but instead of loading multiple sheets vertically, the sheets may be loaded like sashimi, shifted by a predetermined amount. In this case, an angle adjustment unit may be provided, and the sheets may be appropriately collected by a worker while still loaded on the angle-adjustable belt, so that a loading unit is not provided, or another conveyor may be installed downstream. Folded sheets may also be placed in an upright position.

[0129] It can also be implemented as a paper folding machine (paper folding device) that simply folds the sheet 100. The present invention is not limited to the above-described embodiment, and can be implemented with various modifications. The bag making machine 10 is a device for making Western-style envelopes, but is not limited to this, and may be a device for making Japanese-style envelopes or diamond envelopes. [Explanation of symbols]

[0130] 10 bag making machine, 5 glue application section, 71 loading section, 79 angle adjustment section, 96 folding adjustment section, 97 tilting section, 98 flattening section.

Claims

1. A conveying device comprising a conveying section that conveys a folded sheet, a discharge section that is installed upstream of the conveying section and discharges the sheet to the conveying section, and an angle adjustment section that adjusts the angle of the conveying surface of the sheet in the conveying section to avoid interference between a preceding sheet and a following sheet.

2. 2. The conveying device according to claim 1, wherein the angle adjustment unit is provided with a folding adjustment unit that adjusts the angle of the conveying surface in accordance with the folding state of the sheet when the sheet folded at a fold set in a direction intersecting the conveying direction of the conveying unit is discharged to the conveying unit by the discharge unit.

3. The conveying device according to claim 2 , wherein the folding adjustment unit is provided with a tilting unit that tilts the conveying surface by a predetermined angle when the folded sheet is discharged by the discharge unit along the conveying direction of the conveying unit with the fold at the leading edge.

4. A conveying device comprising: a conveying section for conveying a folded sheet; a discharge section installed upstream of the conveying section for discharging the sheet into the conveying section; and an angle adjustment section for adjusting the angle of the conveying surface of the sheet in the conveying section, wherein the angle adjustment section comprises a folding adjustment section for adjusting the angle of the conveying surface in accordance with the folding state of the sheet when the sheet, folded at a crease set in a direction intersecting the conveying direction of the conveying section, is discharged by the discharge section into the conveying section, and the folding adjustment section comprises a flattening section for flattening the conveying surface to lie horizontally when the sheet, which has been folded and has a first fold formed, is discharged by the discharge section along the conveying direction of the conveying section by a predetermined amount, with the first fold as the leading edge, and the sheet is then reversed toward the upstream side to form a second fold.

5. The conveying device according to claim 1 , further comprising a stacking section for stacking the plurality of sheets vertically, the stacking section being disposed downstream of the conveying section.

6. A bag making machine comprising: a folding section for folding the sheet provided upstream of the conveying section; a glue application section for applying glue to a predetermined position of the sheet along the conveying direction of the sheet; and a conveying device according to any one of claims 1 to 5.

7. A sheet transport method in which a folded sheet is transported by a transport section, wherein when the sheet is discharged from a discharge section installed upstream of the transport section toward the transport section, the angle of the transport surface of the sheet is adjusted according to the folding state of the sheet so as to avoid interference between a preceding sheet and a following sheet.

8. 8. A sheet transport method as described in claim 7, wherein the crease is formed by folding the sheet at a crease set in a direction intersecting the transport direction of the transport section, and when the sheet is discharged by the discharge section along the transport direction of the transport section with the crease as the leading edge, the transport surface is inclined at a predetermined angle.

9. A method for transporting a folded sheet by a transport section, wherein when the sheet is discharged from a discharge section installed upstream of the transport section toward the transport section, the sheet is transported by the transport section in which the angle of the transport surface of the sheet is adjusted according to the folding state of the sheet, and the sheet that has been folded and has a first fold formed is discharged by the discharge section in a predetermined amount along the transport direction of the transport section with the first fold at the leading edge, and when the sheet is reversed toward the upstream side to form a second fold, the transport surface is flattened so as to be aligned horizontally.

10. 10. The conveying method according to claim 7, further comprising stacking the plurality of sheets conveyed from the conveying section vertically on a stacking section provided downstream of the conveying section.

11. A bag making method comprising the steps of: applying glue to a predetermined position of a sheet along a conveying direction of the sheet in a glue application section; folding the sheet in a folding section; and conveying the folded sheet to which glue has been applied by a conveying method described in any one of claims 7 to 10.

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