JP2014144848A - Sheet stripe-forming device and sheet folding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent back cracking after folding even in a thick sheet or a sheet having a layer of poor malleability such as a digital printing surface and a UV coat surface.SOLUTION: A sheet stripe-forming device 12 for forming a folding stripe 11c to a sheet 11 conveyed so that the sheet 11 can be easily folded, includes a first stripe-forming roller 14 and second stripe-forming roller 15 disposed facing with each other so as to sandwich the sheet 11 conveyed. The first stripe-forming roller 14 has: a plurality of first protrusions 14a that is formed in a ring shape going around an outer periphery of the first stripe-forming roller 14 and is lined in parallel to each other; and a recess 14b that is formed between the plurality of protrusions 14a. The second stripe-forming roller 15 has: a second protrusion 15a that is formed in a ring shape going around an outer periphery of the second stripe-forming roller 15 and enters into the recess 14b; and a plurality of holding surfaces 15b that faces the respective first protrusions 14a and holds the sheet 11 between a diameter direction tip of the first protrusion 14a and the holding surface 15b.

Description

  In the present invention, in order to make it easy to bend a sheet at a desired position, a sheet creasing device that forms a folding line in advance before folding, and a sheet on which the folding line is formed by the sheet creasing device are used as the folding line. The present invention relates to a technical field of a paper folding apparatus further provided with a paper folding mechanism that bends along the paper.

  In the saddle stitch bookbinding process where the center of the stacked paper is folded and bound with a needle along this fold line, when folding the paper, the position that should be the fold line in order to accurately match the fold line to the desired position The folding lines are formed in advance, and various sheet-scoring mechanisms are used for this purpose.

  As an example of such a paper streaking mechanism, there is one as shown in Patent Document 1. This apparatus of Patent Document 1 uses a creasing concave roller (1a) having a concave groove on the outer periphery and a creasing convex roller (1b) having a ring-shaped protrusion on the outer periphery so that the concave groove and the protrusion face each other. In addition, both rollers are combined.

  By passing the paper between the indentation concave roller (1a) and the indentation convex roller (1b), the paper is deformed at the combination portion of the concave groove and the protrusion, and a folding line is formed in this portion. The sheet on which the folding line is formed is sent to a sheet folding mechanism (4) provided on the downstream side, where it is folded along the folding line.

JP 2003-335455 A

  However, in the folding of the paper in the bookbinding process, the paper that has been printed in advance is folded, so that after the folding, there may occur a phenomenon that the printing breaks along the crease. This phenomenon is called back cracking.

  12A and 12B are diagrams for explaining the back cracking. FIG. 12A shows a state before the printed paper P is folded, and FIG. 12B shows a state of the fold portion after the paper P is folded in two. .

  As shown in FIG. 12A, before folding, the printing ink layer P2 is formed on the ground P1 of the paper. When this is folded in half, as shown in FIG. A crack W occurs in the printing ink layer P2 in the portion, and the ground P1 is exposed in the portion. The reason is that the printing ink layer P2 existing outside the fold is not able to withstand the tensile stress generated during the fold and breaks.

  When such a back crack occurs, for example, in a sheet printed on white paper, the print breaks along the crease, and a white line that is the color of the ground P1 appears, and the quality of the printed matter is significantly lowered.

  When a creasing mechanism such as that disclosed in Patent Document 1 is used, the malleability of the crease portion is slightly increased by being pressed by the projection of the crease convex roller (1b) when the crease is applied to the paper. Although it is expected to have an effect of reducing the backlash, it has not been possible to completely prevent back cracking in various printed materials that are diversified in response to customer demands that have become increasingly sophisticated in recent years.

  For example, in a digital printing machine used for on-demand printing, which has recently been increasing in demand, an image is formed by forming a toner layer on a sheet. Further, UV coating or the like is performed for the purpose of further decorating the printed surface. The surface formed as a result of these treatments is less malleable than conventional offset printing ink layers, and back cracks are likely to occur. In addition, when the thickness of the sheet increases, the amount of deformation outside the bend when bent becomes large, so that back cracks are likely to occur. In the creasing mechanism of Patent Document 1, these phenomena cannot be prevented completely.

  Therefore, the present invention has been made to solve the conventional problems, and even a paper having a layer with poor malleability, such as a digital printing surface or a UV coating surface, or a thick paper, has been bent. It is an object of the present invention to provide a sheet creasing device and a sheet folding device that can prevent back cracking.

  The paper creasing device of the present invention is a paper creasing device that forms a crease for a conveyed paper so that the paper can be easily folded, and is disposed opposite to the conveyed paper. A first streaked roller and a second streaked roller, wherein the first streaked roller is formed in a ring shape that goes around its outer periphery, and a plurality of first ridges arranged in parallel to each other; The second streaked roller is formed in a ring shape that goes around its outer periphery, and enters the concave groove, and the first It has a plurality of clamping surfaces that face the ridges and clamp the sheet between the radial tips of the first ridges.

  According to such a configuration, the sheet is sandwiched between the plurality of first ridges of the first streaked roller and the plurality of sandwiching surfaces of the second streaked roller, while the sheet is nipped. Is pressed and deformed by the second ridges of the second streaked roller, so that the malleability of the crease forming portion can be reliably increased while forming the crease on the sheet. Therefore, even for paper with a layer with poor malleability, such as a digital printing surface or UV-coated surface, or thick paper, the malleability is reliably increased at the stage of forming the crease and the back after folding. Cracking can be prevented.

  In the sheet creasing device of the present invention, a radial distance from the bottom surface of the groove to the tip of the first ridge is larger than a radial distance from the clamping surface to the tip of the second ridge. And

  According to such a configuration, while the sheet is sandwiched between the first protrusion of the first streak roller and the sandwiching surface of the second streak roller, the second streak roller is disposed between the sheet nipping positions. When the second ridge is pressed and deformed, a space necessary for the pressure deformation of the paper is ensured between the tip of the second ridge and the bottom surface of the groove, and the fold line is formed and the malleability is imparted satisfactorily. Can do.

  The sheet folding device according to the present invention is further provided along the folding line while further transporting the sheet on which the folding line is formed by the sheet scoring device to the downstream side of the sheet scoring device according to claim 1 or 2. A paper folding device in which a paper folding mechanism for folding a paper by forming a crease in a folded line is provided, and the line on the paper sandwiched between the first ridge and the sandwiching surface by the paper scoring device Of these, one of the lines is a position to be a paper folding line by the paper folding mechanism.

  According to such a configuration, the line on the sheet sandwiched between the first ridge of the first streaked roller and the sandwiching surface of the second streaked roller is not pushed by the second ridge in the nipped state. The pressure acts to form a clear crease line along the tip of the first ridge, so that the sheet can be folded along the crease line by the sheet folding mechanism, so that the sheet can be folded with high accuracy. Can be done.

  In the paper folding device according to the present invention, the first streaked roller has an odd number of the first ridges, and the paper is squeezed between the first ridges and the sandwiching surface by the paper scoring device. Among the odd number of lines, the center line is a position to be a paper folding line in the paper folding mechanism.

  According to such a configuration, an effect similar to that of the third aspect can be obtained. In addition, among the odd number of lines on the sheet sandwiched between the first protrusion of the first streaked roller and the sandwiching surface of the second streaked roller, it follows the folding line formed in the center line. As the paper is folded by the paper folding mechanism, not only the crease line formed in the center line but also the crease lines formed on both sides of the paper increases the ease of folding, making it possible to fold more accurate paper. Can be performed.

  According to the present invention, there is provided a sheet creasing device capable of preventing back-cracking after folding even on a paper on which a layer having poor malleability such as a digital printing surface or a UV coating surface is formed, or even on a thick paper. There is an effect that a paper folding device can be obtained.

1 is a perspective view of a sheet folding device according to an embodiment of the present invention. It is a top view of the paper folding apparatus which concerns on embodiment of this invention. It is a side view of the paper folding apparatus which concerns on embodiment of this invention. 4A and 4B are cross-sectional views of the sheet folding device according to the embodiment of the present invention, in which FIG. 3A is a cross-sectional view taken along the line AA in FIG. 3, FIG. -C sectional drawing, (d) is DD sectional drawing of FIG. It is sectional drawing which shows the roller opposing part of the paper creasing apparatus which concerns on embodiment of this invention. It is a figure which shows the 1st lined roller of the sheet | seat creasing apparatus which concerns on embodiment of this invention, (a) is the front view which made a part of 1st lined roller into a cross section, (b) is the 1st lined roller. It is a side view of a roller. It is a partial expanded sectional view which shows the crease formation part of the paper in which the crease was formed with the paper creasing apparatus which concerns on embodiment of this invention. It is a top view which shows the positional relationship of the width direction of the paper creasing apparatus and paper folding mechanism which concern on embodiment of this invention. It is sectional drawing which shows the roller opposing part of the paper creasing apparatus which concerns on the 2nd Embodiment of this invention. It is a partial expanded sectional view which shows the crease formation part of the paper in which the crease was formed with the paper creasing apparatus which concerns on the 2nd Embodiment of this invention. It is a top view which shows the positional relationship of the width direction of the paper creasing apparatus and paper folding mechanism which concern on the 2nd Embodiment of this invention. It is a figure explaining a back crack, (a) is a partial expanded sectional view which shows the state before folding of the paper which performed printing, (b) is a partial expansion which shows the state of the crease | fold part after folding this paper into two It is sectional drawing.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. The left and right are the left and right with respect to the paper traveling direction (the direction from the upstream side to the downstream side). The width direction of the device or mechanism is the left / right direction described above.

[Overall configuration of paper folding device]
As shown in FIGS. 1 to 3, the sheet folding device 10 according to the embodiment of the present invention is used for, for example, creation of a saddle-stitched booklet, conveys one or a plurality of stacked sheets 11, and the conveyance direction. This is an apparatus for forming a fold line 11a parallel to the direction indicated by the arrow (1) on the paper 11.

  The sheet folding device 10 is connected to a sheet creasing device 12 that forms a folding line so that the sheet 11 can be easily folded and a downstream side of the sheet creasing device 12. And a sheet folding mechanism 13 that folds the sheet 11 by forming a fold line 11a in a folding line along the folding line while further conveying the sheet 11 on which the folding line is formed by the sheet creasing device 12.

  The sheet scoring device 12 includes a first streaked roller 14 and a second streaked roller 15 that are opposed to each other with the transported paper 11 in between, and by passing the paper 11 between these rollers 14 and 15, A crease is formed at a predetermined location on the paper 11 (in this example, the center line 11b). The detailed configuration of the sheet scoring device 12 will be described later.

  The paper folding mechanism 13 includes a deformation mechanism 16 that gradually deforms the flat paper 11 on which the crease is formed into a mountain shape, and a top portion of the paper 11 that is provided on the downstream side of the deformation mechanism 16 and is deformed into a mountain shape. And a pair of left and right press rollers 17 for forming a fold line 11a on the paper 11.

  The deformation mechanism 16 includes a plurality of (six in this example) support shafts 18 arranged in parallel at a predetermined interval in the paper transport direction, and a plurality of lower pulleys provided on each of the plurality of support shafts 18. 19A-19F. The lower pulley 19A on the upstream side is driven by the power transmitted from the sheet creasing device 12 side. A lower belt 20 (a round belt in this example) is wound around the lower pulleys 19A to 19F, and the lower belt 20 travels in the direction of the arrow (2) according to the driving of the lower pulley 19A.

  Further, the deformation mechanism 16 includes a support shaft 21 disposed above the lower pulley 19 </ b> A and an upper pulley 22 </ b> A provided on the support shaft 21. The upper pulley 22A is driven by a pair of left and right drive pulleys 24 described later via two left and right upper belts 23 (in this example, round belts). A plurality of sets (5 sets in this example) of left and right rollers 25B to 25F are provided on the downstream side of the upper pulley 22A. The upper belt 23 travels in the direction of the arrow (3) with the travel position restricted by the lower portions of the rollers 25B to 25F.

  Further, a plurality of pairs of bend pulleys 26 each having a predetermined inclination with respect to the paper width direction are provided in the vicinity of the downstream roller 25F, and these bend pulleys 26 are outside the inner belt path by the drive pulley 24. The upper belt 23 having shifted to the belt path is returned to the inner belt path. Further, a pair of left and right rollers 27G is provided on the downstream side of the roller 25F, and a rotating plate 28G is disposed on the lower side thereof.

  As shown in FIG. 3, the upper pulley 22A and the rollers 25B to 25F are arranged such that their positions approach the lower pulleys 19A to 19F as they go downstream. By arranging the pulleys and the rollers in this way, the travel line P1 below the upper belt 23 is inclined by an angle Q with respect to the travel line P2 above the lower belt 20.

  As shown in FIG. 4A, the lower edge of the upper belt 23 is located below the upper edge of the lower belt 20 in the upper part of the lower pulley 19A. As a result, the sheet 11 conveyed from the sheet scoring device 12 is supported by the lower belt 20 at the folding line 11c, and the left and right outer surfaces (slopes) 11d are pushed from above by the upper belt 23. As a result, the paper 11 is slightly deformed into a mountain shape (inverted V shape) with the crease 11c as the top. Further on the downstream side, as shown in FIGS. 4B, 4C, and 4D, the upper belt 23 and the lower belt 20 are relatively moved by the action of the inclination angle of the upper belt 23 (FIG. 3, symbol Q). As a result, the apex angle θ of the paper 11 gradually decreases.

  The left and right drive pulleys 24 are driven via drive shafts 29 extending upward. In addition to the drive pulley 24, each drive shaft 29 includes a guide roller 30 that guides the paper 11 to the press roller 17, an input pulley (not shown) that inputs power from a drive source, and the power of the drive shaft 29 is pressed to the press roller. An output pulley (not shown) that outputs to 17 is provided.

  In the vicinity of the downstream side of the drive shaft 29, left and right driven shafts 31 including the press roller 17 are disposed. The left and right driven shafts 31 rotate the press rollers 17 in opposite directions with the power transmitted from the drive shaft 29 via the pulley 24 and the belt 33, respectively (arrows (4) and (5)).

  A pulley 32 can be provided on the downstream side of the press roller 17 in accordance with paper specifications (material, thickness, dimensions, etc.). In this case, the belt 11 (circular belt in this example) is wound around the pulley 32 and the driving pulley 24 (in this example, the lower stage of the pulley), so that the paper 11 is conveyed even while the paper 11 is being bent by the press roller 17. Can continue.

The basic operation of the sheet folding apparatus 10 described above will be described with reference to FIG.
In FIG. 4A, the paper 11 with the crease 11c attached by the paper creasing device 12 is passed between the upper pulley 22A and the lower pulley 19A. Then, the sheet 11 is conveyed while the folding line 11c is supported by the lower belt 20, and the left and right outer surfaces 11d are pushed downward by the upper belt 23. Thereby, the left half part and the right half part of the paper 11 are inclined with the crease 11c as a base point. At this time, the apex angle of the paper 11 is θ1.

  In FIG. 4B, since the upper belt 23 is relatively lowered with respect to the lower belt 20, the apex angle of the paper 11 becomes smaller and becomes θ2. In FIG. 4C, the upper belt 23 is lower than the lower belt 20. Along with this, the apex angle of the paper 11 is further reduced to θ3, and the paper 11 is deformed into a mountain shape until the apex angle becomes an acute angle. The sheet 11 deformed into the mountain shape is conveyed by the upper belt 23 and the belt 33 while maintaining the form by the roller 27G and the rotating plate 28G (see FIGS. 1 to 3), and reaches the press roller 17.

  In FIG. 4D, the apex angle portion of the paper 11 is passed between the left and right press rollers 17. Then, the apex angle portion of the paper 11 is conveyed while being pressed between the left and right press rollers 17, and a fold line 11a is formed along the fold line 11c.

[Paper Streaking Device According to First Embodiment]
Next, the sheet scoring device 12 according to the first embodiment of the present invention will be described in detail with reference to FIGS.

  As described above, the sheet scoring device 12 includes the first streaked roller 14 and the second streaked roller 15 that are opposed to each other with the transported paper 11 interposed therebetween, and each of the rollers 14 and 15 is a drive (not shown). The power transmitted from the source rotates in opposite directions (arrows (6) and (7) in FIG. 3). Then, by passing the paper 11 between these rollers 14 and 15, a crease 11 c is formed at a predetermined position of the paper 11.

  As shown in FIGS. 5 and 6, the first streaked roller 14 is disposed to face the lower side of the second streaked roller 15, and the outer periphery thereof includes a plurality of (two in this example) first. It has a ridge 14a (in this example, a ridge having a curved surface at the tip) and one or a plurality of (in this example, one) groove 14b. The two first ridges 14a are formed in a ring shape that goes around the outer periphery of the first streaked roller 14, and are arranged in parallel to each other at a predetermined interval in the rotation axis direction. Further, the concave groove 14b is formed between the first ridges 14a.

  As shown in FIG. 5, the second streaked roller 15 is disposed on the upper side of the first streaked roller 14, and the outer periphery thereof is one or a plurality (in this example, one) second convex. It has a strip 15a (in this example, a convex curve with a curved tip shape) and a plurality of (two in this example) clamping surfaces 15b. The second ridge 15 a is formed in a ring shape that goes around the outer periphery of the second streaked roller 15, and enters the concave groove 14 b of the first streaked roller 14. The two clamping surfaces 15b face the first ridges 14a of the first streaked roller 14, and clamp the paper 11 between the first ridges 14a in the radial direction.

  In such a sheet scoring device 12, when the paper 11 is passed between the first streaked roller 14 and the second streaked roller 15, the two first ridges 14 a included in the first streaked roller 14 and By rotating while sandwiching the paper 11 between the two sandwiching surfaces 15b of the second streaked roller 15, the second ridge 15a of the second streaked roller 15 is sandwiched between the gripping positions of the paper 11. The paper 11 is pressed and deformed downward, and a crease 11c is formed here.

  According to such a sheet creasing device 12, the sheet 11 is pressed and deformed between the nipping positions in a state where the sheet 11 is nipped between the two first protrusions 14a and the two nipping surfaces 15b. Not only is formed, but also a predetermined tensile stress acts between the clamping positions, and the malleability of the fold line 11c is reliably increased. Thereby, even if it is the paper 11 in which the layer with poor malleability layers, such as a digital printing surface and a UV coat surface, and the thick paper 11, the malleability is increased at the stage of forming the crease 11c, It becomes possible to prevent the back crack after bending.

  In the sheet scoring device 12, the projecting dimension in the radial direction of the first ridge 14a and the second ridge 15a, the depth dimension of the groove 14b, etc. are arbitrary depending on the material and thickness of the sheet 11, the number of stacked sheets, etc. However, the radial distance A from the bottom surface of the groove 14b to the tip of the first ridge 14a is larger than the radial distance B from the clamping surface 15b to the tip of the second ridge 15a. It is preferable to enlarge it.

  The reason for this is that the sheet 11 is nipped while the sheet 11 is nipped between the plurality of first ridges 14 a of the first lined roller 14 and the plurality of nipping surfaces 15 b of the second lined roller 15. When the space between the positions is pressed and deformed by the second ridge 15a of the second streaked roller 15, a space necessary for the pressure deformation of the paper 11 is provided between the tip of the second ridge 15a and the bottom surface of the groove 14b. This is because the fold line 11c can be sufficiently formed and malleability can be imparted sufficiently.

  By the way, in the sheet scoring device 12, the crease 11c is formed with a certain width C as shown in FIG. The paper 11 on which the crease 11c is formed by the paper creasing device 12 is conveyed to the paper folding mechanism 13, where a fold along the crease 11c is formed. At this time, the positional relationship in the width direction of the sheet folding mechanism 13 with respect to the sheet creasing device 12 is such that the folding line L1 (the center line of the lower belt 20) of the sheet 11 in the sheet folding mechanism 13 is formed on the sheet 11. 11c, that is, inside the two lines L2 on the paper 11 sandwiched between the first ridge 14a and the sandwiching surface 15b, but preferably, as shown in FIG. Of these lines L2, any one of the lines L2 is preferably in a positional relationship that becomes the folding line L1 of the paper 11 in the paper folding mechanism 13.

  The reason is that the line L2 on the paper 11 sandwiched between the first protruding line 14a of the first lined roller 14 and the holding surface 15b of the second lined roller 15 is in the nipped state in the second protruding line. This is because the pressing force 15a acts to form a clear crease line 11e along the tip of the first ridge 14a, and the paper 11 is folded by the paper folding mechanism 13 along the crease line 11e. This makes it possible to bend the paper 11 with high accuracy.

  The outer diameters of the plurality of first ridges 14a may all be the same, but the outer diameter of the first ridge 14a coinciding with the folding line L1 of the paper 11 is set to be the same as that of the other first ridges 14a. It may be formed slightly larger than the outer diameter. Specifically, the outer diameter of the first ridge 14a coinciding with the folding line L1 of the paper 11 is about 0.1 to 0.5 mm in radius than the outer diameter of the other first ridge 14a. Form large. With this configuration, the crease line 11e formed by the first ridge 14a coinciding with the fold line L1 is formed stronger than the other crease lines 11e. A fold line 11a can be formed on the straight line.

[Paper Streaking Device According to Second Embodiment]
Next, a sheet scoring device 12B according to a second embodiment of the present invention will be described in detail with reference to FIGS. However, about the part which is common in the said embodiment, description of the said embodiment is used by using the same code | symbol as the said embodiment.

  As shown in FIG. 9, the sheet creasing device 12B according to the second embodiment includes an odd number of first ridges 14a (this number) when the first ridged rollers 14B are provided with a plurality of first ridges 14a. In the example, 3 points are different from the above embodiment. Accordingly, the number of the concave grooves 14b of the first streaked roller 14B is an even number (two in this example), the number of the second ridges 15a of the second streaked roller 15B is two (in this example), and the clamping surface 15b is an odd number (three in this example).

  In such a sheet scoring device 12B, when the paper 11 is passed between the first streaked roller 14B and the second streaked roller 15B, the three first ridges 14a of the first streaked roller 14B and While the paper 11 is sandwiched between the three sandwiching surfaces 15b of the second streaked roller 15B, the two second ridges 15a of the second streaked roller 15B are sandwiched between the gripping positions of the paper 11. The crease 11c is formed by pressing and deforming downward.

  In the sheet scoring device 12B, the crease 11c is formed with a certain width D as shown in FIG. The paper 11 on which the crease 11c is formed by the paper scoring device 12B is conveyed to the paper folding mechanism 13, where a fold along the crease 11c is formed. At this time, the positional relationship in the width direction of the sheet folding mechanism 13 with respect to the sheet scoring device 12B is that the folding line L1 (the center line of the lower belt 20) of the sheet 11 in the sheet folding mechanism 13 is formed on the sheet 11. 11c within the width D, that is, within the three lines L2 on the sheet 11 sandwiched between the first ridge 14a and the sandwiching surface 15b, it may be inside the line L2 at the left and right ends. 11, it is preferable that the center line L <b> 2 among the three lines L <b> 2 is in a positional relationship to be the folding line L <b> 1 of the paper 11 in the paper folding mechanism 13.

  The reason is that, similarly to the above-described embodiment, the line L2 on the paper 11 sandwiched between the first protruding line 14a of the first streaked roller 14B and the sandwiching surface 15b of the second streaked roller 15B This is because the pressing force of the second ridge 15a acts in the sandwiched state, and a clear crease line 11e is formed along the tip of the first ridge 14a. The sheet is folded along the crease line 11e. By folding the paper 11 with the mechanism 13, it becomes possible to bend the paper 11 with high accuracy.

  Moreover, of the three lines L2 on the paper 11 sandwiched between the first ridge 14a of the first streaked roller 14B and the sandwiching surface 15b of the second streaked roller 15B, the center line L2 is formed. Since the sheet 11 is bent by the sheet folding mechanism 13 along the formed folding line 11e, the sheet 11 can be easily folded not only by the folding line 11e formed on the center line L2 but also by the folding lines 11e formed on both sides thereof. Therefore, the paper 11 can be folded with higher accuracy.

  Note that the sheet scoring device and the sheet folding device of the present invention are not limited to the present embodiment, and appropriate modifications and improvements can be made. For example, as an embodiment, a case where two first ridges are formed and a case where three first ridges are formed for the first streaked roller is shown. The number may be four or more. In FIGS. 5 and 9, the first protruding strip tip of the first streaked roller and the sandwiching surface of the second striped roller are in contact with each other. It is arbitrarily set according to the thickness, the number of stacked layers, and the like. In short, when forming a crease line on the paper, the first protruding strip tip of the first streaked roller and the clamping surface of the second streaked roller It is only necessary to hold the sheet between the two.

  DESCRIPTION OF SYMBOLS 10 ... Paper folding apparatus, 11 ... Paper, 11a ... Crease, 11b ... Center line, 11c ... Crease, 11d ... Outer surface, 11e ... Crease line, 12, 12B ... Paper streaking device, 13 ... Paper folding mechanism, 14 , 14B ... first streaked roller, 14a ... first convex strip, 14b ... concave groove, 15, 15B ... second streaked roller, 15a ... second convex strip, 15b ... clamping surface, 16 ... deformation mechanism, 17 ... Press roller, 18 ... support shaft, 19 ... lower pulley, 20 ... lower belt, 21 ... support shaft, 22 ... upper pulley, 23 ... upper belt, 24 ... drive pulley, 25 ... roller, 26 ... bend pulley, 27 ... roller, 28 ... Rotating plate, 29 ... Drive shaft, 30 ... Guide roller, 31 ... Driven shaft, 32 ... Pulley, 33 ... Belt

Claims (4)

A sheet creasing device that forms a crease for a conveyed sheet so that the sheet can be easily folded.
A first streaked roller and a second streaked roller disposed opposite to each other with the paper to be conveyed interposed therebetween;
The first streaked roller is:
A plurality of first ridges formed in a ring shape that goes around the outer periphery and arranged in parallel to each other;
A concave groove formed between the first ridges,
The second streaked roller is:
A second ridge that is formed in a ring shape that goes around its outer periphery and enters the groove,
A sheet stapling apparatus, comprising: a plurality of clamping surfaces that face the first ridges and clamp a sheet between the radial ends of the first ridges.   2. The sheet creasing device according to claim 1, wherein a radial distance from the bottom surface of the groove to the tip of the first ridge is larger than a radial distance from the clamping surface to the tip of the second ridge. . 3. A sheet in which a crease is formed in a fold line along the crease line while further conveying the sheet on which the crease line is formed by the sheet creasing apparatus to the downstream side of the sheet creasing apparatus according to claim 1 or 2. A paper folding device in which a paper folding mechanism for folding the paper is provided,
One of the lines on the sheet sandwiched between the first ridge and the sandwiching surface by the sheet scoring device is a position that becomes a sheet folding line by the sheet folding mechanism. Paper folding device. The first streaked roller has an odd number of the first ridges,
Among the odd number of lines on the sheet sandwiched between the first ridge and the sandwiching surface by the sheet scoring device, a center line is a position that is a sheet folding line in the sheet folding mechanism. The paper folding apparatus according to claim 3, wherein

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