Paper cutting device

Abstract

To provide a sheet cutting device in which, when a large-size sheet is cut, a cut-off piece generated by cutting by a cutting mechanism and to be discharged downward is prevented from being accumulated in the vicinity of the cutting mechanism and can be discharged downward promptly.SOLUTION: A sheet cutting device includes a movable guide arranged between a cutting mechanism and a pair of second conveyance rollers and configured to support a conveyed sheet in a manner of freely elevating and lowering the sheet.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a paper cutting device that cuts paper while transporting the paper. [Background technology]

[0002] A known paper cutting device is equipped with a pair of opposing guillotine-type cutting blades, one above the other, which comes into contact with and separates from the other, and cuts the paper conveyed by a pair of conveying rollers installed before and after the cutting blade in the width direction perpendicular to the conveying direction. The following Patent Document 1 discloses a paper processing device that is partially equipped with such a cutting device, and performs processing by cutting off a predetermined portion of the printed paper using the cutting device, leaving only the printed portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-232700 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a trend toward larger maximum paper sizes that can be printed on general-purpose printers, and it is becoming increasingly common for printers to be able to print on large paper sizes larger than B3 size.

[0005] Meanwhile, in the conventional paper cutting devices commonly used on the market, the maximum paper size that can be processed is, for example, B3 size. When using the general-purpose paper cutting device to cut out a predetermined portion of the large-format printed paper such as B2 size and perform processing to leave only the printed portion, an operator can manually cut the paper to a size within B3 size (primary processing) before feeding it to the general-purpose paper cutting device, which allows cutting (secondary processing); however, it is cumbersome for an operator to perform the cutting in advance.

[0006] A large-size paper cutting device (for primary processing) that cuts paper in advance to a size that the general-purpose paper cutting device can accept and then transfers the processed paper to the general-purpose paper cutting device (for secondary processing) can be installed and connected upstream in the conveying direction of the general-purpose paper cutting device, but when cutting large-size paper in advance (primary processing), if the paper being conveyed is thin and weak, the leading edge of the paper may droop on the paper conveying path in the cutting processing section due to the large size of the paper, which may cause the paper to be jammed midway without being conveyed smoothly, or to become impossible to process. Specifically, when the paper is handed over between the conveying rollers arranged on the upstream and downstream sides of the paper cutting position, the handover may not be as smooth as described above.

[0007] Furthermore, if an angle adjustment means is provided that can adjust the angle of the cutting mechanism 2 so that it is perpendicular to the transport direction of the printed image based on the detected inclination angle of the printed image, as shown in Figure 1, an extra distance is required between the transport rollers to accommodate the swing width of the cutting mechanism 2, making it even more difficult to transfer the paper.

[0008] Although this problem can be solved by arranging a transport guide that supports the paper from below when the paper is handed over between the transport rollers, a new problem arises in that when the unnecessary parts (cut pieces) of the paper after it has been cut are discarded below outside the transport path, they get caught in the transport guide and do not fall smoothly downward. When large-sized paper is used as the workpiece, the unnecessary parts after cutting the paper also become large in width, making them more likely to get caught.

[0009] The object of the present invention is to provide a paper cutting device that can prevent the leading edge of the paper from sagging on the paper transport path in the cutting section when cutting large-sized paper, even if the paper being transported is thin and weak, thereby suppressing the occurrence of processing errors such as jams and enabling transportation and processing to be performed with high accuracy.Furthermore, it is an object of the present invention to provide a paper cutting device that can quickly discharge the cut pieces that are cut by the cutting mechanism and should be discharged downward without accumulating near the cutting mechanism. [Means for solving the problem]

[0010] In order to achieve the above object, the invention described in claim 1 comprises: A paper cutting device including a cutting mechanism that cuts paper in a direction perpendicular to the paper transport direction by a pair of cutting blades arranged opposite to each other across a paper transport surface, a first transport roller pair arranged upstream of the cutting mechanism in the paper transport direction, and a second transport roller pair arranged downstream of the cutting mechanism in the paper transport direction, A movable guide is disposed between the cutting mechanism and the second conveying roller pair, and supports the conveyed paper so as to be movable up and down. picture, a guide position where the movable guide guides the transported paper along a paper transport surface; a position for discarding unnecessary portions of the paper after cutting the paper, below and outside the conveying path; a lifting means for selectively lifting the sheet conveying member to a retracted position spaced downward from the sheet conveying surface, and a lifting control means for controlling the operation of the lifting means, the lifting control means controls the lifting means to repeat a lifting operation of lowering the movable guide to the retracted position and then returning it to the guiding position multiple times as one cycle in order to discard unnecessary portions of the cut paper below and outside the conveying path after the paper is cut by the cutting mechanism; The present invention is characterized in that:

[0013] Claim 2 The invention described is as follows: 1 to In the paper cutting device described, The movable guide is characterized in that an inclined guide surface that is inclined upward in the conveying direction is formed on the upper part of the movable guide.

[0014] Claim 3 The invention described is as follows: 2 to In the paper cutting device described, The lifting means comprises a lifting motor and an eccentric cam that is eccentric with respect to the center of rotation of the lifting motor, and the movable guide comprises a guide roller that abuts against the eccentric cam.

[0015] Claim 4 The invention described is as follows: 3 In the paper cutting device described in The lifting means is characterized in that it is disposed at two locations on both ends of the movable guide.

[0016] Claim 5 The invention described is as follows: 4 In the paper cutting device described in The lifting means arranged at two ends of the movable guide are configured to be independently controllable by the lifting control means, and the phases of the cams in the lifting means can be set to the same phase or different phases. Effect of the Invention

[0018] According to the invention described in claim 1, when cutting large-sized paper, even if the paper being transported is thin and weak, the leading edge of the paper can be prevented from sagging on the paper transport path in the cutting section, and the occurrence of processing errors such as jams can be suppressed, and transport and processing can be performed with high accuracy. Furthermore, the cut pieces that are cut by the cutting mechanism and should be discharged downward can be discharged downward quickly without accumulating near the cutting mechanism. Also, even if the above-mentioned angle adjustment means is disposed between the transport rollers and the distance between the transport rollers becomes excessively wide, the same effect can be obtained by the movable guide.

[0021] Claim 2According to the described invention, the upper part of the movable guide is formed with an inclined guide surface that is inclined upward in the transport direction, so that when the movable guide is in the guiding position, the paper with its leading edge drooping on the paper transport path in the cutting section can be smoothly introduced to the upper part of the movable guide and handed over to the downstream transport rollers. Also, when the movable guide is in the retracted position, the cut pieces that are cut by the cutting mechanism and should be discharged downward slide down the inclined guide surface and can be quickly discharged downward without being stuck near the cutting mechanism.

[0022] Claim 3 According to the described invention, the lifting means comprises a lifting motor and an eccentric cam that is eccentric with respect to the center of rotation of the lifting motor, and the movable guide comprises a guide roller that abuts against the eccentric cam, thereby allowing the movable guide to be freely raised and lowered, and therefore the effect can be achieved with a simple configuration.

[0023] Claim 4 According to the described invention, the lifting means is disposed at two locations, one at each end of the movable guide, so that the left-right balance during lifting and lowering of the movable guide is stable.

[0024] Claim 5 According to the described invention, the lifting means arranged at two ends of the movable guide are configured to be independently controllable by the lifting control means, and the phase of the cam in the lifting means can be set to the same phase or different phases, so that the left and right balance of the movable guide descending relative to the cut pieces to be cut by the cutting mechanism and discharged downward can be intentionally shifted, and as a result, the cut pieces can be quickly discharged downward without remaining near the cutting mechanism. [Brief description of the drawings]

[0026] [Figure 1] 1 is a plan view showing the overall configuration of a paper processing system. [Diagram 2] 1 is a schematic overall configuration diagram of a paper feeder and a first paper cutting device according to an embodiment of the present invention; [Diagram 3] FIG. 2 is a schematic diagram showing the overall configuration of a cutting mechanism; [Figure 4] FIG. 2 is a perspective view showing the overall configuration of a cutting mechanism including a movable guide and a lifting means. [Diagram 5] FIG. 4 is a perspective view showing a drive system of the lifting means. [Figure 6] FIG. 2 is a front view showing the overall configuration of the cutting mechanism. [Figure 7] FIG. 4 is a perspective front view showing a drive system of a moving blade unit in the cutting mechanism. [Figure 8] 4 is a rear view showing a drive system for a pair of upper and lower rotary blades in the moving blade unit. FIG. [Figure 9] FIG. 4 is a left side view showing the drive system of the cutting unit. [Figure 10] FIG. 4 is a perspective front view showing a drive system of the moving blade unit. [Figure 11] 11A and 11B are diagrams showing how paper is processed in a cutting mechanism. [Figure 12] 11A and 11B are diagrams showing how paper is processed in a cutting mechanism. [Figure 13] 11A and 11B are diagrams showing how paper is processed in a cutting mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] [Overall configuration of paper processing system 100] 1 is a plan view showing the overall configuration of a paper processing system 100 according to one embodiment of the present invention. The paper processing system 100 of this embodiment is composed of, from the upstream side in the conveying direction, a paper feeder 10, a first paper cutting device 20, a cross conveyor device 30, an insertion unit 40, a second paper cutting device 50, and a conveyor stacker device 60 as main processing mechanisms.

[0028] In recent years, the maximum paper size that can be printed by general-purpose printers has tended to become larger, and it is becoming increasingly common for printers to be able to print sizes larger than B3 size. This paper processing system 100 accepts printed paper (P) that is larger than a certain size, cuts out a specified portion of the printed paper (paper after cutting: P1), and performs a processing process that leaves only the printed portion (paper after processing: P2).

[0029] The second paper cutting device 50 is a general-purpose paper cutting device that has been widely used in the market for some time, and the maximum paper size that can be processed is, for example, B3 size. The first paper cutting device 20 can also process sizes larger than B3 size. The paper processing system 100 is configured so that the first paper cutting device 20 cuts and processes paper in advance to a paper size that the second paper cutting device 50 can accept, and then passes the processed paper to the second paper cutting device 50.

[0030] [Paper feeding device 10] As shown in Figures 1 and 2, the paper feeder 10 has an air feed unit 11 of an air suction belt type, an elevator type paper feed tray 12 that rises and falls depending on the amount of paper loaded, and a pair of transport rollers 13 that transports the paper sent out by the air feed unit further downstream in the transport direction. In this embodiment, it is configured to be able to feed paper up to a maximum size of B2. When the paper P is transported by the pair of transport rollers 13 and the leading edge of the paper P reaches the leading edge detection sensor 21 of the first paper cutting device 20 described below, the pressure of the pair of transport rollers 13 in the paper feeder is released, and the paper is transported only by the three pairs of transport rollers 23 in the first paper cutting device 20 described below.

[0031] [First paper cutting device 20] As shown in Figs. 1 and 2, the first paper cutting device 20 is installed to perform pre-cutting (primary processing) to a paper size that can be accepted by the general-purpose second paper cutting device 50, and has a leading edge detection sensor 21 (21a, 21b) that detects the arrival of the leading edge of the paper P transported from the paper feeder 10, and a laser sensor 27 (27a, 27b) that detects the leading edge of the paper P and the position of a registration mark previously given to the paper P, and detects the inclination angle of the printed image with respect to the paper transport direction. The leading edge detection sensor 21 and the laser sensor 27 are each disposed at two positions in the width direction perpendicular to the paper transport direction. The first paper cutting device 20 also has an angle adjustment means that can adjust the angle of the cutting mechanism 2 of the crosscut section so that it is perpendicular to the transport direction of the printed image based on the inclination angle of the printed image detected by the laser sensor 27.

[0032] The first paper cutting device 20 includes a cutting mechanism 2 that cuts paper in a direction perpendicular to the paper transport direction using a pair of cutting blades (in this embodiment, a pair of upper and lower rotary blades 221a, 221b) arranged opposite to each other across the paper transport surface, a first transport roller pair 25 arranged on the upstream side of the cutting mechanism in the paper transport direction, and a second transport roller pair 26 arranged on the downstream side of the cutting mechanism in the paper transport direction.The first paper cutting device 20 further includes a movable guide 70 that is arranged between the cutting mechanism 2 and the second transport roller pair 26 and supports the transported paper so that it can be raised and lowered.

[0033] The cutting mechanism 2 stops the paper P at a preset cutting position, and then cuts the paper P by moving the movable blade unit 22 (a pair of upper and lower rotary blades 221a, 221b) in the width direction perpendicular to the conveying direction of the paper P. The cut paper P1 is discharged onto the cross conveyor device 30 by three conveying rollers (26, 24, 24).

[0034] The discharge of the paper P1 is detected by a discharge sensor 29. As for the cutting blade for pre-cutting (primary processing) the large-sized paper P1, a guillotine-type cutting blade is required that is long in the width direction of the paper, and therefore warping and distortion become a problem. In contrast, if a pair of upper and lower rotary blades that move in the paper transport direction are used, the problems of warping and distortion are eliminated, and this is suitable for the paper cutter 20. Details of the cutting mechanism 2 and the movable blade unit 22, which are the main parts of the present invention, will be described separately below.

[0035] [Cross conveyor device 30] The cross conveyor device 30 receives the sheet P1 that has been cut and processed by the first paper cutting device 20 and transported in a first direction, transports it in a second direction intersecting the first direction, and sends it to the second paper cutting device processing device 50. The cross conveyor device 30 is disposed downstream of the first paper cutting device 20 and is provided with an inclined conveying means which receives the paper P1 discharged from the first paper cutting device 20 onto an endless belt 31 (a single belt having a predetermined width) and conveys the paper P1 diagonally toward the guide wall 32 so that the edge of the received paper P1 is aligned with the guide wall 32, while conveying the paper P1 downstream in the conveying direction.

[0036] [Insertion unit 40] An insertion unit 40 is disposed downstream of the cross conveyor device 30, which delivers the paper sheets P1 discharged from the cross conveyor device 30 to a paper feed opening of the second paper cutting device 50. The insertion unit 40 includes an oblique conveying means for conveying the received paper P1 obliquely toward the guide wall 41 by air suction while conveying the paper P1 downstream in the conveying direction so that the edge of the paper P1 is aligned with the guide wall 41.

[0037] [Second paper cutting device 50] The second paper cutting device 50 is a paper cutting device that has conventionally been widely used on the market, and paper sheets P1 that have been cut in advance (primary processing) by the first paper cutting device 20 to a paper size that the second paper cutting device 50 can accept are delivered from the insertion unit 40 to the paper feed opening of the second paper cutting device 50. After that, the paper sheets P1 are sent out one by one in the paper transport direction, and the sent out paper sheets P1 are cut while being transported in the device body based on the preset job contents, and the cut single sheets P2 are discharged from the device body.

[0038] [Conveyor stacker device 60] A conveyor stacker 60 may be connected to the discharge side of the second paper cutting device 50. The conveyor stacker 60 is a device that slowly transports cut sheets P2 discharged from the second paper cutting device 50 by a belt conveyor and stacks the sheets at an angle in a stacker 61 provided at the end of the belt.

[0039] [Embodiment of cutting mechanism 2] Next, an embodiment of the cutting mechanism 2 in the first sheet cutting device 20 will be described with reference to Figs. 6 to 9. Fig. 6 is a front view showing the overall configuration of the cutting mechanism 2 (the movable guide 70 and the lifting means 77 are omitted from the drawing). Details of the movable guide 70 and the lifting means 77 will be described later. Fig. 9 is a left side view of Fig. 6. Fig. 7 is a see-through front view showing the drive system of the moving blade unit 22 in the cutting mechanism 2 in Fig. 6. Fig. 8 is a rear view showing the drive system of the pair of upper and lower rotary blades 221 in the moving blade unit 22.

[0040] 6 to 9, the cutting mechanism 2 includes a frame 210 provided across the entire width of the maximum size paper to be transported, a cutting means that cuts the paper by moving the moving blade unit 22 in a width direction W perpendicular to the paper transport direction F, and moving blade unit drive parts 227a, 227b that move the moving blade unit 22. The moving blade unit drive parts 227a, 227b are housed inside the frame 210.

[0041] The movable blade unit 22 includes a pair of upper and lower rotary blades 221 (221a, 221b) and a pair of upper and lower frame bodies 211a, 211b that rotatably support the pair of upper and lower rotary blades 221 and reciprocate in the width direction perpendicular to the paper conveying direction. The pair of upper and lower rotary blades 221 rotate in forward and reverse directions by reciprocating the movable blade unit 22.

[0042] Specifically, the pair of upper and lower rotary blades 221 are arranged opposite each other across the paper transport path 5, with an upper rotary blade 221a arranged on the upper side and a lower rotary blade 221b arranged on the lower side.

[0043] Next, the movable blade unit driving portions 227a and 227b will be described.

[0044] As shown in Fig. 7 and Fig. 9, the movable blade unit driving parts 227a and 227b are configured by arranging an upper movable blade unit driving part 227a arranged on the upper side and a lower movable blade unit driving part 227b arranged on the lower side opposite each other through the paper transport path 5. The movable blade unit driving parts 227a and 227b are provided with timing belts 217a and 217b arranged side by side with a predetermined interval. The timing belt 217a is stretched between the pulley 215a and the pulley 216a, and the timing belt 217b is stretched between the pulley 215b and the pulley 216b. Furthermore, a timing belt 225 is stretched between the pulley 205a attached to the rotation shaft 226a shared with the pulley 215a and the pulley 205b attached to the rotation shaft 226b shared with the pulley 215b.

[0045] The rotating shafts 226a and 226b are each rotatably supported by a frame 210, and the rotating shaft 226a extends to the opposite side through the frame 210. A pulley 208 fixed to the rotating shaft 226a together with the pulleys 215a and 205a is connected to a pulley 209 attached to the rotating shaft of a drive motor 219 via a timing belt 207.

[0046] That is, the movable blade unit driving parts 227a and 227b include a driving motor 219 functioning as a driving means, a pulley 209 attached to the rotary shaft of the driving motor, a pulley 208 attached to the rotary shaft 226a, and a timing belt 207 stretched between these pulleys 209 and 208. When the driving motor 219 is driven to rotate, the driving force is transmitted to the pulleys 205a and 215a via the pulley 209, the timing belt 207, the pulley 208, and the rotary shaft 226a, and further transmitted to the pulley 205b via the pulley 205a and the timing belt 225, and to the pulley 215b via the rotary shaft 226b, so that the timing belts 217a and 217b run. The timing belt 225 is provided with a tension applying roller 206 for applying tension.

[0047] The timing belts 217a and 217b are closed-loop belts, and portions thereof are fixed to the upper frame 211a and the lower frame 211b at fixing portions 222a and 222b, respectively. Therefore, when the drive motor 219 rotates and the timing belts 217a, 217b run, the upper frame 211a and the lower frame 211b move together in the width direction W perpendicular to the paper transport direction F.

[0048] Next, a configuration for rotating the pair of upper and lower rotary blades 221 will be described.

[0049] The lower frame 211b is provided with a pinion gear 214 rotatably supported on a rotation shaft 214a of the lower frame 211b, and configured to mesh with the rack gear 213 over the movable range of the lower frame 211b. The frame 210 is also provided with a rack gear 213 that slidably supports the lower frame 211b on the underside of a member having a substantially U-shaped cross section. Note that Fig. 8 is a view of the movable blade unit 22 as seen from behind, showing the state in which the pinion gear 214 and the rack gear 213 mesh with each other.

[0050] Fig. 10 is a perspective front view showing the drive system of the moving blade unit. In Fig. 10, a timing belt 235 is stretched between a pulley 231 attached to a rotating shaft 214a common to the pinion gear 214 and a pulley 232 attached to a rotating shaft 232a common to the lower rotary blade 221b. As described above, the timing belts 217a and 217b are driven by the driving force of the drive motor 219, and the upper frame 211a and the lower frame 211b move in the width direction W perpendicular to the paper conveying direction F. The pinion gear 214 rotates due to the gear meshing with the rack gear 213, and the lower rotary blade 221b rotates around the rotation center 232a via the timing belt 235. In addition, the upper rotary blade 221a rotates around the rotation center 223 as a fulcrum with the rotation of the lower rotary blade 221b.

[0051] According to this embodiment, the pair of upper and lower rotary blades 221 rotate by meshing of gear members, the pinion gear 214 and the rack gear 213, so the rotation of the pair of upper and lower rotary blades 221 does not stop due to an abnormality such as slippage. In addition, since a large rotational force is obtained by using gear members to rotate the pair of rotary blades 221a, 221b, it is possible to reliably rotate the pair of upper and lower rotary blades 221 (221a, 221b) in conjunction with the movement of the upper frame 211a and the lower frame 211b. Therefore, the paper P can be reliably cut.

[0052] As shown in Fig. 10, the upper frame 211a and the lower frame 211b are provided with pairs of conveying rollers 237, 238 installed on both sides in the width direction W of the pair of upper and lower rotary blades 221 (upper rotary blade 221a and lower rotary blade 221b). A round belt 236 is stretched between a pulley 232 attached to a common rotary shaft 232a with the lower rotary blade 221b, and pulleys 233, 234 attached to a common rotary shaft with the pair of conveying rollers 237, 238. Therefore, the pair of conveying rollers 237, 238 rotate at the same time as the pair of upper and lower rotary blades 221 rotate. The pair of conveying rollers 237, 238 play a role in introducing the paper P when cutting the paper and cutting it while pressing it.

[0053] [Embodiment of lifting means 77] Next, an embodiment of the lifting means 77 for the movable guide 70 in the cutting section including the cutting mechanism 2 will be described with reference to FIGS.

[0054] 3 shows the overall configuration of the cutting section including the cutting mechanism 2, which includes a cutting mechanism 2 that cuts paper in a direction perpendicular to the paper transport direction using a pair of cutting blades (in this embodiment, a pair of upper and lower rotary blades 221a, 221b) arranged opposite to each other across the paper transport surface 5, a first transport roller pair 25 arranged upstream of the cutting mechanism 2 in the paper transport direction, and a second transport roller pair 26 arranged downstream of the cutting mechanism 2 in the paper transport direction. The cutting mechanism 2 stops the paper P at a pre-set cutting position, and then cuts the paper P by moving the moving blade unit 22 (the pair of upper and lower rotary blades 221a, 221b) in the width direction perpendicular to the direction in which the paper P is transported. A pair of upper and lower guides 81 are provided at the paper introduction portion of the first transport roller pair 25, and a pair of upper and lower guides 83 are provided at the paper discharge portion of the second transport roller pair 26.

[0055] Furthermore, the cutting section is provided with a movable guide 70 that is disposed between the cutting mechanism 2 and the second conveying roller pair 26 and supports the conveyed paper so that it can be raised and lowered. An upper portion of the movable guide 70 forms an inclined guide surface 700 that is inclined upward toward the conveying direction.

[0056] Next, a specific configuration of the lifting means 77 will be described. As shown in Fig. 5, an elongated hole 702 formed in a bent portion 701 of the movable guide 70 slides against bearings 703a and 703b attached to a base member 76, so that the movable guide 70 can be freely lifted and lowered in the vertical direction. The movable guide 70 is biased downward by a spring 74. A light shielding plate 704 is integrally formed with the movable guide 70, and is configured so that when the movable guide 70 rises to the uppermost position, the light shielding plate 704 shields the light from a photointerrupter 75 attached to the base member 76. Therefore, the uppermost position of the movable guide 70 can be detected.

[0057] The lifting means 77 includes a lifting motor 71 and an eccentric cam 72 that is eccentric with respect to the rotation center of the lifting motor 71, and the movable guide 70 is integrally provided with a guide roller 73 that abuts against the eccentric cam 72. When the lifting motor 71 rotates the eccentric cam 72, the guide roller 73 is raised and lowered so that the rotation center of the guide roller 73 that abuts against the eccentric cam 72 draws an arc. As a result, the movable guide 70 can be raised and lowered so as to swing up and down relative to the base member 76. This makes it possible to function as the lifting means 77 for the movable guide 70 with a simple configuration.

[0058] The cutting section includes lifting means 77 for raising and lowering the movable guide 70, and lifting control means for controlling the operation of the lifting means 77, and the lifting means 77 can selectively raise and lower the movable guide 70 to a guide position where the transported paper is guided along the paper transport surface, and a retracted position where the movable guide 70 is spaced downward from the paper transport surface 5. The retracted position is a position for discarding unnecessary portions of the paper after it has been cut, below and outside the transport path. This prevents the leading edge of the paper from sagging on the paper transport path in the cutting and processing section, suppresses processing errors such as jams, and allows for accurate transport and processing. Furthermore, the cut pieces that are cut by the cutting mechanism 2 and should be discharged downward can be discharged downward quickly without accumulating near the cutting mechanism.

[0059] Next, the overall configuration of the lifting means 77 will be described. In the following description, the same components are denoted by the same reference numerals in the drawings, and duplicated description will be omitted. As shown in FIG. 4, the lifting means 77 is attached integrally to the frame 210 downstream in the paper conveying direction of the moving blade unit 22 of the cutting mechanism 2 shown in FIG. 6. The lifting means 77 is disposed at two locations on both ends of the movable guide 70. Therefore, the left and right balance during lifting and lowering of the movable guide is stable. In addition, since the lifting means 77 disposed at two locations on both ends of the movable guide 70 are configured to be independently controllable by the lifting control means, the phases of the eccentric cams 72 in the lifting means 77 can be set to the same phase or different phases. This makes it possible to intentionally shift the left-right balance of the movable guide 70 that descends relative to the pieces that are to be cut by the cutting mechanism 2 and discharged downward, thereby enabling the pieces to be quickly discharged downward without remaining in the vicinity of the cutting mechanism 2.

[0060] The lifting control means controls the lifting means 77 to repeat the lifting operation of lowering the movable guide 70 to the retracted position and then returning it to the guiding position multiple times as one cycle, in order to discard the unnecessary portion of the cut paper below and outside the conveying path after the paper has been cut by the cutting mechanism 2. According to this, due to the stimulation (vibration), the cut pieces that are cut by the cutting mechanism 2 and should be discharged downward can be discharged downward quickly without remaining in the vicinity of the cutting mechanism 2.

[0061] According to the above, when cutting large-sized paper, even if the paper being transported is thin and weak, the leading edge of the paper can be prevented from sagging on the paper transport path in the cutting section, and the occurrence of processing errors such as jams can be suppressed, and transport and processing can be performed with high accuracy. Furthermore, the cut pieces that are cut by the cutting mechanism and should be discharged downward can be discharged downward quickly without accumulating near the cutting mechanism. Also, even if the above-mentioned angle adjustment means is disposed between the transport rollers and the distance between the transport rollers becomes excessively wide, the same effect as above can be obtained by the movable guide 70. The lifting means 77 is not limited to the configuration using the eccentric cam 72, and can be implemented by other means such as a solenoid.

[0062] [Lifting and lowering operation of the movable guide 70] Next, the lifting and lowering operation of the movable guide 70 will be described with reference to FIGS.

[0063] (1) Disposal of unnecessary parts (leading edge) after cutting paper 11(a) and (b) are state transition diagrams when the unnecessary portion P' (leading edge gutter) of the paper P is cut off and discarded below outside the conveying path (state transitions are in the order of (a) → (b)). Note that in each drawing, when the pair of rotary blades (221a, 221b) are represented by dashed lines, this indicates that the pair of rotary blades are placed in the retracted position and the paper P is not being cut, and when the pair of rotary blades are represented by solid lines, this indicates that the paper P is being cut.

[0064] 11(a), the paper P is transported from the first transport roller pair 25 toward the movable guide 70, and the movable guide 70 guides and supports the front end of the paper P hanging downward with an inclined guide surface 700. At this time, the movable guide 70 is disposed at a guide position where it guides the transported paper along the paper transport surface. According to this, when the movable guide is in the guiding position, the paper with its leading edge drooping on the paper transport path in the cutting section can be smoothly guided to the upper part of the movable guide and supported.

[0065] 11(b), the transport of the paper P is stopped at a predetermined position of the paper P, and the paper is cut by moving a pair of rotary blades (221a, 221b) in a width direction W perpendicular to the paper transport direction F. During cutting, the paper P is cut while the front end portion is supported by the movable guide 70. After cutting, the paper P is separated into an unnecessary portion P' (leading edge gutter) and the following paper P (portion corresponding to the product). Simultaneously with or after cutting the paper, the movable guide 70 descends from the guiding position to the retreat position, and the unnecessary portion P' (leading edge gutter) after cutting slides down the inclined guide surface 700 of the movable guide 70 and is discarded below outside the conveyance path. According to this, when the movable guide is in the retracted position, the cut pieces that are cut by the cutting mechanism and to be discharged downward slide down the inclined guide surface 700, and can be quickly discharged downward without remaining near the cutting mechanism.

[0066] (2) Transport and support of deliverables 12(c), (d), 13(e), and (f) are state transition diagrams when the subsequent paper P (corresponding to the finished product) after cutting in FIG. 11(b) is transferred from the first conveyor roller pair 25 to the second conveyor roller pair 26 (the state transitions are in the order of (c)→(d)→(e)→(f)). Note that in each drawing, when the pair of rotary blades (221a, 221b) are represented by dashed lines, this indicates that the pair of rotary blades are disposed at the retracted position and the paper P is not being cut, and when the pair of rotary blades are represented by solid lines, this indicates that the paper P is being cut.

[0067] 12(c), the paper P is conveyed from the first conveying roller pair 25 toward the movable guide 70, and the movable guide 70 waits at a guide position where the conveyed paper is guided along the paper conveying surface. At this time, the front end of the product P is slightly hanging down.

[0068] 12(d), the paper P is transported further downstream, and the movable guide 70 introduces the front end of the downwardly hanging product P with the inclined guide surface 700, and guides it toward the second transport roller 26. At this time, the movable guide 70 is disposed at the guide position. According to this, when the movable guide is in the guiding position, paper with a drooping leading edge on the paper transport path in the cutting section can be smoothly guided to the upper part of the movable guide and handed over to the downstream transport rollers.

[0069] 13(e), when the paper P is transferred from the first conveyor roller pair 25 to the second conveyor roller pair 26, tension is applied due to the speed difference between the first conveyor roller pair 25 and the second conveyor roller pair 26, and a gap of approximately 0.5 mm to 1 mm is formed between the upper end of the inclined guide surface 700 of the movable guide 70 and the bottom surface of the paper P being conveyed. This gap (Y) is formed to prevent the bottom surface of the paper P from being scratched when the paper P is conveyed. At this time, the movable guide 70 is disposed in the guiding position.

[0070] As shown in FIG. 13(f), the conveyance of the paper P is stopped at a predetermined position of the paper P, and the paper is cut by moving a pair of rotary blades (221a, 221b) in the width direction W perpendicular to the paper conveyance direction F. The cut paper P is separated into a product P1 and an unnecessary part P' (rear end gutter). At this time, the movable guide 70 is disposed at the guide position and supports the rear end of the product P hanging below the product P1. After that, the pair of rotary blades (221a, 221b) move to the retreat position, and the unnecessary part P' (rear end gutter) is discarded below the conveyance path. Note that if the length of the unnecessary part P' is longer than a predetermined length and cannot be discarded below, the pair of rotary blades may be configured to discard the unnecessary part P' downward while cutting it multiple times. Also, the movable guide 70 may be configured to be disposed at the retreat position when discarding the unnecessary part P' (rear end gutter).

[0071] It is clear that the present invention is not limited to the present embodiment, and that the present embodiment can be appropriately modified within the scope of the technical concept of the present invention in addition to the modifications suggested in the present embodiment. Furthermore, the number, position, shape, etc. of the components are not limited to the present embodiment, and the number, position, shape, etc. of the components can be any number, position, shape, etc. suitable for implementing the present invention. [Explanation of symbols]

[0072] F Conveying direction W Width direction 2 Cutting mechanism 5. Transport Route 20 First paper cutting device 22 Moving blade unit 70 Movable guide 71 Lifting motor 72 Eccentric Cam 73 Guide Roller 74 Spring 75 Photointerrupter 76 Base material 77 Lifting means 100 Paper Processing Systems 210 Frames 211 Frame 213 Rack Gear 214 Pinion gear 217 Timing belt 221 Pair of Rotating Blades 222 Fixed part 227 Moving blade unit drive part 701 Bending part 702 Slot 703 Bearing 704 Shading plate

Claims

1. A paper cutting device including a cutting mechanism that cuts paper in a direction perpendicular to a paper transport direction by a pair of cutting blades arranged opposite to each other across a paper transport surface, a first transport roller pair arranged upstream of the cutting mechanism in the paper transport direction, and a second transport roller pair arranged downstream of the cutting mechanism in the paper transport direction, a movable guide disposed between the cutting mechanism and the second conveying roller pair for supporting the conveyed paper so as to be movable up and down; a lifting means for selectively lifting and lowering the movable guide to a guide position for guiding the transported paper along the paper transport surface and a retracted position for discarding unnecessary portions of the paper after cutting below and outside the transport path, the retracted position being spaced below the paper transport surface, and a lifting control means for controlling the operation of the lifting means; the lifting control means controls the lifting means to repeat a lifting operation of lowering the movable guide to the retracted position and then returning it to the guiding position multiple times as one cycle in order to discard unnecessary portions of the cut paper below and outside the conveying path after the paper is cut by the cutting mechanism; A paper cutting device characterized by:

2. 2. The paper cutting device according to claim 1, wherein an inclined guide surface that is inclined upward in the conveying direction is formed on an upper portion of the movable guide.

3. 3. The paper cutting device according to claim 2, wherein the lifting means comprises a lifting motor and an eccentric cam that is eccentric with respect to the center of rotation of the lifting motor, and the movable guide comprises a guide roller that abuts against the eccentric cam.

4. 4. The paper cutting device according to claim 3, wherein the lifting means is disposed at two locations, one at each end of the movable guide.

5. The paper cutting device according to claim 4, characterized in that the lifting and lowering means arranged at two ends of the movable guide are configured to be independently controllable by the lifting and lowering control means, and the phases of the cams in the lifting and lowering means can be set to the same phase or different phases.

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