JP5814067B2 - Method for controlling paper processing apparatus - Google Patents

Description

  The present invention relates to a control method for a paper processing apparatus, and more particularly to a control method for a paper processing apparatus having a cutting mechanism that cuts paper in a direction orthogonal to the paper transport direction.

  As a paper processing apparatus, an apparatus has been developed that uses, in combination with the above-described cutting mechanism, a slit forming mechanism that cuts paper parallel to the paper transport direction and a folding mold forming mechanism that forms folds on the paper, as appropriate, using a cassette method. ing.

  FIG. 16 shows a cutting mechanism of the paper processing apparatus. The cutting mechanism 201 includes an upper movable blade 201a and a lower fixed blade 201b, and the paper is moved at the cutting position P1 by moving the upper movable blade 201a up and down. N is cut in a direction orthogonal to the paper conveyance direction F. On the upstream side and the downstream side of the paper conveyance of the cutting mechanism 201, a pair of conveyance rollers 202 and 203 each including a pair of upper and lower conveyance rollers 202a, 202b and 203a, 203b are arranged. A paper receiving unit 204 is disposed on the downstream side of the sheet conveyance of the roller pair 203.

  FIG. 4 shows an example of an array pattern of products (delivered products) Q processed from a sheet of paper N by a sheet processing apparatus. In this array pattern, there is a crease by cutting and fold forming processing. Four products Q are produced. Specifically, the slit forming mechanism cuts the paper N along a plurality of slit lines E parallel to the paper transport direction F, so that the cut ranges K at both ends and the middle in the paper transport width direction W are cut and folded. A crease is formed by a forming mechanism along a fold line G in a paper conveyance width direction W perpendicular to the paper conveyance direction F, and a plurality of cutting lines C, Cr in the paper conveyance width direction W are formed by a cutting mechanism 201 (FIG. 16). By cutting the paper N, the front end cut region (front end margin) Sf, the intermediate cut region Sm, and the rear end cut region (rear end margin) Sr are cut.

  When processing the sheet N with the arrangement pattern as shown in FIG. 4, in the cutting process, as shown in FIG. 16, the cut pieces (so-called dove) of the cut front end cut region Sf and the cut pieces of the intermediate cut region Sm are The cutting mechanism 201 and the conveyance roller pair 203 on the downstream side of the paper conveyance are discharged downward, while the cut piece in the rear edge excision region Sr is separated from the cutting mechanism 201 and the conveyance roller pair 202 on the upstream side of the paper conveyance. And is released downward through the gap.

  However, the trailing edge excision region Sr differs in the sheet conveying direction length Lr depending on the size, number and arrangement of the products Q. If the sheet conveying direction length Lr becomes too large, the sheet is released downward after cutting. It may not be possible. For example, as shown in FIG. 17, the length Lr of the trailing edge cutting region Sr in the sheet conveyance direction is larger than the distance D1 between the cutting position P1 of the cutting mechanism 201 and the nip position P2 of the conveying roller pair 202 on the upstream side of the sheet conveyance. In this case, the cut piece in the rear end cutting region Sr after cutting is sent out in the transport direction F by the transport roller pair 202 on the transport upstream side. As a result, the lower fixed blade 201b is overcome and stays on the downstream side of the paper conveyance of the cutting mechanism 201, or is sandwiched by the conveyance roller pair 203 on the downstream side of the paper conveyance and discharged to the paper receiving portion 204, or the lower side Or stay on the fixed blade 201b. These phenomena cause paper jams and cutting failures.

  As a countermeasure against this, the present applicant, when the length Lr of the trailing edge excision region Sr in the sheet conveyance direction is equal to or greater than a predetermined value, sequentially sets the trailing edge cutting region Sr from the downstream edge of the sheet conveyance as shown in FIG. A control method for finely cutting and dividing each predetermined cutting unit length Lr0 has been devised (Patent Document 1). The predetermined shredding unit length Lr0 is such a length that the cut piece of the shredded divided region Sr0 can be discharged downward from the gap between the cutting mechanism 201 and the transport roller pair 203 on the downstream side of paper transport in FIG. Is set.

JP 2001-232700 A

  By the way, when reducing the length of the product (delivered product) in the transport direction, the pitch in the front-rear direction of the upstream and downstream transport roller pairs 202 and 203 is narrowed. The narrower is the smaller the predetermined shredding unit length Lr0 (see FIG. 15), and as a result, the paper transport distance required for one shredding division operation is shortened. The rotation angle of the upstream conveying roller pair 202 corresponding to is reduced. In this way, when the rotation angle of the upstream conveying roller pair 202 corresponding to the conveying distance of the cut piece becomes small, the last cut piece is not released when the cut piece in the last divided region is conveyed, and the upstream conveying roller It remains in the upper half area of the lower conveying roller 202b of the pair 202.

  An object of the present invention is to provide a control method for a paper processing apparatus having a step of cutting, dividing, and discharging a rear edge cutting area of a paper, and a cutting piece to be cut out by a cutting mechanism and discharged downward is provided in the cutting mechanism. It is an object of the present invention to provide a control method for a paper processing apparatus that can quickly discharge downward without staying in the vicinity.

  In order to solve the above-described problems, the present invention provides a cutting mechanism that cuts a sheet in a direction orthogonal to the sheet conveying direction by a pair of cutting blades arranged opposite to each other with a sheet conveying surface interposed therebetween, and a sheet conveying upstream side of the cutting mechanism A first conveying roller pair disposed on the sheet conveying side, a second conveying roller pair disposed on the sheet conveying downstream side of the cutting mechanism, and a drive unit that drives the first and second conveying roller pairs and the cutting mechanism; A control unit for controlling the operation of the drive unit, and when the length (Lr) of the rear end cutting area (Sr) of the paper in the sheet conveyance direction is equal to or greater than a predetermined value (Dn), the rear end cutting area (Sr) is sequentially cut from the downstream end of the sheet conveyance into a predetermined shredding unit length (Lr0), and is divided. The length (Lr1) in the sheet conveying direction of the rearmost end divided area (Sr1) is determined by the cutting mechanism. And the rearmost end divided region (Sr1) has a length substantially corresponding to the distance between the position (P1) and the nip position (P2) of the first conveying roller pair. The drive unit is controlled so that the first conveying roller pair rotates 90 ° or more from the time when the passage through the nip position is completed.

  In the present invention, in addition to the above contents, preferably, the cutting mechanism is controlled so as to perform a re-cutting operation on the rearmost end divided region (Sr1) after the first conveying roller pair has rotated 90 ° or more. Is done. In this case, more preferably, the first conveying roller pair is stopped during the re-cutting operation by the cutting mechanism. The first conveying roller pair is controlled so as to resume rotation after the re-cutting operation by the cutting mechanism.

(1) According to the present invention, the length (Lr) in the sheet conveyance direction of the trailing edge cutting area (Sr) of the sheet is long, and therefore, the predetermined shredding unit is sequentially formed from the downstream edge of the sheet conveyance in the trailing edge cutting area (Sr). When the cut is divided into lengths (Lr0) and discharged, not only the cut pieces cut into a predetermined cut unit length (Lr0), but also the cut pieces of the last end divided region (Sr1) remaining at the end, Without staying, the sheet can be reliably and promptly discharged downward from between the cutting mechanism and the first conveying roller pair on the upstream side of the sheet conveyance. As a result, problems such as paper jams, scratches on the paper, or mixing with the product and discharged to the paper receiving portion are solved.

(2) Further, after cutting the rearmost divided area (Sr1), after the first conveying roller pair has rotated 90 ° or more, a recutting operation is performed to impact the cut piece in the rearmost divided area. The excision piece in the rearmost divided region can be dropped. At this time, it is possible to more reliably apply the impact on the cut piece by stopping the first conveying roller pair.

It is a model longitudinal cross-sectional view of the paper processing apparatus which implements the control method which concerns on this invention. It is a perspective view of the cutting mechanism of FIG. It is a longitudinal cross-sectional enlarged view of a cutting mechanism. It is a top view which shows an example of the product arrangement pattern of a paper. FIG. 5 is a partially enlarged plan view of the sheet of FIG. 4 in the case where the trailing edge cut region is cut and divided according to the present invention. It is a cross-sectional schematic diagram which shows the initial stage conveyance state of the process of cutting and dividing | segmenting a rear end cutting area | region finely. FIG. 7 is a schematic cross-sectional view showing a state at the time of the first division cutting after the conveyance of FIG. 6. It is a cross-sectional schematic diagram which shows the state conveyed to the last division | segmentation cutting position. It is a cross-sectional schematic diagram which shows the state which cut | disconnected the last end division area. FIG. 6 is a schematic cross-sectional view showing a state in which the cut piece has started to be guided downward by the rotation of the upstream conveying roller pair after cutting the rearmost divided region. It is a cross-sectional schematic diagram which shows the state which has guided the cut piece of the rearmost end division | segmentation area | region downward. FIG. 11 is a schematic cross-sectional view showing a state in which the upstream-side transport roller pair is rotated 90 ° from the state of FIG. 10. FIG. 11 is a schematic cross-sectional view showing a state when the re-cutting mechanism is operated after the upstream conveying roller pair is rotated 90 ° from the state of FIG. 10. It is a cross-sectional schematic diagram which shows the state in which the excision piece of the last end division area is falling. It is a top view which shows the conventional cutting pattern of a rear end cutting area | region. It is a cross-sectional schematic diagram which shows operation | movement of the conventional cutting mechanism based on the cutting pattern of FIG. It is a cross-sectional schematic diagram which shows another operation | movement of the conventional cutting mechanism.

[Overall configuration of paper processing equipment]
FIG. 1 is a schematic longitudinal sectional view of a sheet processing apparatus that implements a control method according to the present invention. In FIG. 1, the paper processing apparatus includes a paper receiver 2 at the downstream end in the paper transport direction F of the apparatus main body 1 and a paper feed unit 3 at the upstream end in the paper transport direction F. A substantially horizontal conveyance path 5 is formed between 3 and the paper receiver 2. A suction conveyance belt mechanism 8a and a sheet supply roller 8b are disposed in the sheet feeding unit 3, and a plurality of pairs of conveyance rollers 9, 10, 11, 12, 13 and the like are spaced in the sheet conveyance direction F in the conveyance path 5. As a processing mechanism, a slit forming mechanism 20, a folding mold forming mechanism 21, and a cutting mechanism 22 are arranged from the upstream side of the paper transport to the downstream side of the paper transport. In addition, a scrap box 23 is disposed at a lower end portion in the apparatus main body 1 to store scrap paper pieces generated by processing such as slitting and cutting.

  A reject mechanism 25 and a CCD sensor 26 are disposed on the upstream side of the slit forming mechanism 20 with respect to the sheet conveyance, and a cut piece dropping mechanism 27 is disposed on the downstream side of the slit forming mechanism 20 with respect to the sheet conveyance. Each of the slit forming mechanism 20, the folding mold forming mechanism 21, and the cutting mechanism 22 is configured as a detachable unit, and has a structure that can be attached and detached at a desired position in the apparatus main body 1 by a cassette method. Therefore, according to the type of processing, the arrangement order of the mechanisms 20, 21, 22 can be changed, or replaced with other mechanisms (chamfering mechanism, perforation forming mechanism, etc.) or added.

  Each conveyance roller pair 9, 10, 11, 12, 13 is connected to each roller drive unit 41, 42, 43, 44 via a power transmission mechanism, and each roller drive unit 41, 42, 43, 44. Are electrically connected to the control unit 45. The control unit 45 incorporates a storage device such as a CPU, RAM, and ROM, and an operation panel 46 and a CCD sensor for inputting and displaying various work setting information to the interface of the control unit 45. 26 is electrically connected.

  The transport path 5 further includes a plurality of light transmission type paper detection sensors 31, 32, which detect the front edge (paper transport downstream edge) Na or the paper rear edge (paper transport upstream edge) Nb of the paper N. 33, 34, and 35 are disposed, and are electrically connected to the interface of the control unit 45, respectively. The first sheet detection sensor 31 on the most upstream side of the sheet conveyance is disposed in the vicinity of the sheet conveyance upstream side of the CCD sensor 26, and the next second sheet detection sensor 32 is in the vicinity of the sheet conveyance upstream side of the slit forming mechanism 20. The next third sheet detection sensor 33 is disposed in the middle of the slit forming mechanism 20, and the next fourth sheet detection sensor 34 is disposed in the vicinity of the sheet conveying upstream side of the folding mold forming mechanism 21. The fifth paper detection sensor 35 on the most downstream side of the paper conveyance is disposed in the vicinity of the paper conveyance upstream side of the paper receiver 2.

  The first paper detection sensor 31 on the most upstream side in the transport direction detects the front edge Na or the rear edge Nb of the paper N gripped by the transport roller pair 9 after the paper N is supplied from the paper feed unit 3. Then, the position of each sheet N being conveyed on the conveyance path 5 is uniquely detected on the basis of the detected sheet position.

  The second paper detection sensor 32 and the third paper detection sensor 33 detect the jam of the paper N. The fourth paper detection sensor 34 detects the first paper in preparation for the case where the transport path 5 becomes long and accumulation of misalignment (transport error) of the paper N in the paper transport direction F occurs on the transport path 5. The paper position information obtained by the sensor 31 is corrected so that the paper position information becomes more accurate. The fifth paper detection sensor 35 detects the carry-out of the product Q to the paper receiver 2 or detects a jam or the like.

  Since the present invention relates to the control of the cutting mechanism 22 and the pair of conveying rollers 12 and 13 in the vicinity thereof in the sheet processing apparatus, each processing mechanism and each part other than those will be briefly described.

[Paper Feed Unit 3]
The paper feed unit 3 supplies a predetermined number of sheets N stacked on the paper feed tray 3a to the transport path 5 one by one in order from the upper end by the suction transport belt mechanism 8a and the paper feed roller 8b. The paper feed roller 8 and the suction conveyance belt mechanism are connected to a paper feed drive unit 47, and the paper feed drive unit 47 is electrically connected to the control unit 45.

[CCD sensor 26]
The CCD sensor 26 is installed so that it can automatically read the work setting information separately from manual input of various work setting information by the operation panel 46. Specifically, the image of the position mark M1 printed at the front end corner of the paper N as shown in FIG. 4 is read, and the paper N in the paper conveyance direction F and the paper conveyance width direction W perpendicular to the paper conveyance direction are read. A processing reference position is detected, and an image of the barcode M2 printed on the front edge of the paper N is read to obtain various work setting information to be applied to the paper N. As the work setting information, for example, in addition to the total length La and the total width of the paper N in the paper conveyance direction F, the cutting lines C, Cr, E and the folding lines G corresponding to the size, number and arrangement of the processed product Q Position, etc. The length Lb in FIG. 4 indicates the length from the front edge Na of the paper N to the cutting line Cr at the conveyance downstream end of the rear edge cutting region Sr.

[Reject mechanism 25]
The reject mechanism 25 in FIG. 1 operates on the paper N when the printed position mark M1 and bar code M2 are unclear and cannot be read by the CCD sensor 26, and the unreadable paper. N is dropped and collected by the waste tray 25a.

[Slit forming mechanism 20]
In the embodiment, the slit forming mechanism 20 has three unit portions arranged in the paper transport direction F, and each unit portion has a pair of rotary blades 36 composed of upper and lower rotary blades spaced in the transport width direction W, respectively. Two sets are arranged with each other. The lower rotary blade is connected to a rotary blade drive mechanism 48 such as a motor via a power transmission mechanism. That is, a slit is formed in parallel with the paper transport direction F with respect to the paper N by rotating the lower rotary blades with the driving force of the rotary blade drive unit 48. The interval between the rotary blade pairs 36 in the conveyance width direction W can be arbitrarily changed.

[Removal piece dropping mechanism 27]
The cut piece dropping mechanism 27 is for excluding cut pieces (cut region K in FIG. 4) generated by the cutting of the slit forming mechanism 20 to the outside of the transport path 5. When passing, the cut piece is dropped into the waste box 23.

[Folding mold forming mechanism 21]
The folding mold forming mechanism 21 includes a lower mold 21B having an upper end concave portion and an upper mold 21A having a lower end convex portion fitted into the concave portion, and the upper mold 21A is attached to a mold driving unit 49 such as a motor. It is connected via a power transmission mechanism. That is, by lowering the upper mold 21A by the driving force of the folding mold drive unit 49, a crease is formed in the sheet conveyance width direction W perpendicular to the sheet conveyance direction F with respect to the sheet N.

[Cutting mechanism 22]
The cutting mechanism 22 includes a lower fixed blade 22B and an upper movable blade 22A that extend in the paper conveyance width direction W. The upper movable blade 22A is connected to a cutting drive unit 50 such as a motor via a power transmission mechanism. Has been. In order to unify the terms used in the claims, the pair of transport rollers 12 on the upstream side of the sheet transport of the cutting mechanism 22 is a first transport roller pair, and the pair of transport rollers 13 on the downstream side of the sheet transport of the cutting mechanism 22. Will be referred to as a second conveying roller pair and will be described below. The first transport roller pair 12 and the second transport roller pair 13 include a drive-side lower transport roller 12B and 13B and a driven-side upper transport roller 12A and 13A, which are coupled to roller drive units 43 and 44, respectively. It consists of and.

  FIG. 2 is a specific example of the cutting mechanism 22, and the lower fixed blade 22B is disposed substantially horizontally so as to extend in the paper conveyance width direction W, and the upper movable blade 22A extends from the blade edge portion 22Aa to the blade with respect to the horizontal. It is inclined so as to become lower as it goes to the original portion 22Ab, and moves in the vertical direction along the upper guide body 29 disposed on the upstream side in the paper transport direction F.

  The blade base 22Ab of the upper movable blade 22A is linked to a cutting drive unit (drive motor) 50 via a parallel link mechanism 51, a crank mechanism 52, and a gear transmission mechanism 53, and the driving power of the cutting drive unit 50 is Thus, the upper movable blade 22A is translated in the vertical direction while maintaining an inclined state.

[Product arrangement pattern of paper]
As already described in the section of the prior art, the arrangement pattern of the products Q shown in FIG. 4 is such that four products Q having folds are produced from one sheet N. Basically, four cutting lines C and Cr extending in the paper conveyance width direction W, four slit lines E extending in parallel to the paper conveyance direction F, and two fold lines extending in the paper conveyance width direction W G is set, and the sheet N is cut by these cutting lines C, Cr and E, and a crease is formed by the fold line G, whereby four products Q having folds are manufactured.

(Contents of control by the control unit 45 regarding the cutting mechanism 22)
The control unit 45 in FIG. 1 incorporates a program of the following stages with respect to the cutting process.
(1) As a first stage, based on the input values of various work setting information from the operation panel 46 or the CCD sensor 26 in FIG. 1, the length Lr in the sheet conveyance direction of the trailing edge excision area Sr shown in FIG. It is determined whether or not the value is larger than Dn. When it is determined that the value is larger than the predetermined value Dn, as shown in FIG. 5, the cutting for division for cutting and dividing the rear end cutting area Sr into the predetermined shredding unit length Lr0 in order from the downstream end of the sheet conveyance. The positions of the line Cr0 and the final cutting line Cr1 are set. In the present embodiment, the predetermined value Dn, which is a criterion for determining whether or not to divide, is, as shown in FIG. 3, between the cutting position P1 of the cutting mechanism 22 and the nip position P2 of the first conveying roller pair 12. It is set to a value substantially corresponding to the distance D1. Note that. The diameter D5 of the lower conveying roller 12B of the first conveying roller pair 12 is 19.1 mmφ in this embodiment.

  Further, the predetermined shredding unit length Lr0 is such that the cut piece of the shredded divided region Sr0 is rapidly lowered from the gap D2 between the cutting mechanism 22 and the second transport roller pair 13 on the downstream side of the paper transport in FIG. It is set to a length that can be released.

(2) As a second stage, as shown in FIG. 5, the sheet conveyance direction length Lr1 of the last remaining divided end area Sr1 is between the cutting position P1 and the nip position P2 of the first conveyance roller pair 12. The position of the final cutting line Cr1 is set so as to substantially correspond to the distance D1 (in this embodiment, Lr1 = Dn is set). In this case, the length Lr2 in the sheet conveyance direction of the cut region Sr2 immediately before the rearmost divided region Sr1 is 0 ≦ Lr2 ≦ Lr0. This completes the setting of the dividing cutting lines Cr0, Cr1, etc. of FIG.

  In this embodiment, since the gap D2 between the cutting mechanism 22 and the second conveyance roller pair 13 on the downstream side of the sheet conveyance is about 15 mm, the predetermined chopping unit length Lr0 is set to 14 mm and the predetermined value Dn ( ≒ D1) is set to 25mm. For example, if the length Lr of the rear end cutting area Sr in FIG. 4 is 72 mm, Lr is larger than a predetermined value Dn = 25 mm. Therefore, as shown in FIG. In order from the downstream side of the sheet conveyance, three division cutting lines Cr0 are set, and the final cutting line Cr1 is set so that the conveyance direction length Lr1 of the rearmost divided area Sr1 is 25 mm. . Accordingly, the length Lr2 in the sheet conveyance direction of the divided area Sr2 immediately before the rearmost divided area Sr1 is Lr2 = 72− (14 × 3) −25 = 5 (mm).

(3) The third stage is a substantial operation control of the cutting mechanism 22 and the first conveying roller pair 12. That is, as shown in FIGS. 6 to 8, after cutting at the first cutting line Cr with respect to the trailing edge cutting region Sr, the three cutting lines Cr0 for division are cut to reach the final cutting line Cr1. In the cutting operation, the first conveyance roller pair 12 is driven at a normal conveyance speed V1 (for example, 600 mm / second or more) by a rotation angle corresponding to the length Lr0 (paper conveyance amount) of each cut piece. Controlled. Then, after cutting along the final cutting line Cr1 shown in FIG. 9, the rear end (Nb) of the rearmost divided region Sr1 indicates the nip position P2 of the first conveying roller pair 12 as shown in FIGS. After the passage is completed, the driving of the first transport roller pair 12 is controlled so that the first transport roller pair 12 rotates 90 ° or more (θ ≧ 90 °). In addition, the conveyance speed V2 of the first conveyance roller pair 12 in FIGS. 10 to 12 is set to a value (for example, 700 mm / second or more) higher than the normal conveyance speed V1.

(4) Furthermore, as shown in FIG. 13, in the fourth stage, when the rear end of the rearmost split region Sr1 has passed through the nip position P2 of the first conveying roller pair 12 and rotated 90 ° or more, The cutting mechanism 22 is set to perform a re-cutting operation.

[Overview of overall work of paper processing equipment]
(1) In FIG. 1, various operation setting information relating to the size, type, and product arrangement, number, and dimensions of paper are input through the operation panel 46. Instead of this manual input or in cooperation with the manual input, the work setting information can be automatically input by reading the barcode M2 or the like by the CCD sensor 26.

(2) A plurality of sheets N stacked on the tray 3a of the sheet feeding unit 3 in FIG. 1 are supplied to the conveyance path 5 one by one from the upper end by the suction conveyance belt mechanism 8a and the sheet supply roller 8b.

(3) The CCD sensor 26 reads the position mark M1 of the paper N and, if necessary, the barcode M2, and acquires various work setting information to be applied to the paper N.

(4) When the reading by the CCD sensor 26 is impossible, the operation is performed on the paper N, and the unreadable paper N is dropped and collected by the waste tray 25a.

(5) In the slit forming mechanism 20, the paper N is cut by a plurality of slit lines E parallel to the paper transport direction F.

(6) In the cut piece dropping mechanism 27, the cut piece cut by the slit forming mechanism 20 (the cut region K in FIG. 4) is dropped into the waste box 23.

(7) The fold forming mechanism 21 forms a crease at the fold line G in the paper conveyance width direction W.

(8) The cutting mechanism 22 feeds the paper N to the cutting mechanism 22 at the normal transport speed V1 by the first transport roller pair 12, and sequentially cuts along the cutting lines C and Cr in FIG. The cut pieces of the cut front end cut region Sf and the intermediate cut region Sm pass between the cutting mechanism 22 and the second conveying roller pair 13 and are discharged to the lower waste box 23 as shown in FIG. The On the other hand, the cut piece in the rear edge cut region Sr is excluded by a different method as follows according to the value of the length Lr in the sheet conveyance direction.

(8-1)
In FIG. 6, when the length Lr of the trailing edge excision area Sr in the sheet conveyance direction is equal to or greater than the predetermined value Dn, the trailing edge cutting area Sr is set as the downstream end in the sheet conveyance direction as shown in FIGS. In order from, cutting is performed for each divided region Sr0 having a predetermined shredding unit length Lr0. The cut pieces (Sr0) that have been cut are sequentially discharged from between the cutting mechanism 22 and the second transport roller pair 13 to the lower waste box 23. In this case, the conveyance speed of the first conveyance roller pair 12 is the normal conveyance speed V1.

  Then, after the last cutting line Cr1 for division is cut as shown in FIG. 9, the first transfer roller pair 12 is rotated at a transfer speed V2 higher than the normal transfer speed V1, as shown in FIG. To do. In this case, after the rearmost divided region Sr1 has passed through the nip position P2 of the first conveying roller pair 12, the first conveying roller pair 12 rotates by 90 ° or more. Accordingly, as shown in FIG. 11, the cut piece of the rearmost end divided region Sr1 is supported by the lower fixed blade 22B at the front portion, and the rear end edge Nb is conveyed below the first conveying roller pair 12. The roller 12B is guided forward and downward (downward downstream in the transport direction), and starts to fall from the first transport roller pair 12 when rotated 90 ° (θ = 90 °) as shown in FIG. Then, as shown in FIG. 13, when the first conveying roller pair 12 rotates 90 ° or more (θ> 90 °), the cutting mechanism 22 performs a re-cutting operation, and the cut piece of the rearmost divided region Sr1 is cut. Impact near the front edge. As a result, as shown in FIG. 14, the cut piece in the rearmost split region Sr1 passes between the cutting mechanism 22 and the first conveying roller pair 12 and is quickly discharged to the lower waste box 23. In the re-cutting operation shown in FIG. 13, in the present embodiment, the first conveying roller pair 12 maintains the rotation state and continues the conveyance.

(8-2)
When the length Lr in the sheet conveyance direction of the trailing edge excision region Sr shown in FIG.

[Effect of the embodiment]
(1) When the rear end cut area Sr of the paper N is cut into pieces for each predetermined shredding unit length Lr0 and divided, the rear end of the rear end divided area Sr1 is the nip position of the first conveying roller pair 12 After passing through P2, the first conveying roller pair 12 rotates by 90 ° or more, so that the cut piece of the rearmost end divided region Sr1 is the surface of the conveying roller 12B below the first conveying roller pair 12 at the rear end. Is guided downwardly forward (downward downstream in the transport direction) of the transport roller 12B, so that it is reliably discharged downward from the gap (D3) between the cutting mechanism 22 and the first transport roller pair 12. As a result, problems such as paper jams, scratches on the paper, or mixing with the product and discharged to the paper receiving portion are solved.

(2) The predetermined shredding unit length Lr0 is set to be equal to or smaller than the interval D2 in the paper transport direction F between the cutting mechanism 22 and the second transport roller pair 13, and is thus divided into the predetermined shredding unit length Lr0. The cut piece of the divided area Sr0 is reliably discharged downward from between the cutting mechanism 22 and the second conveyance roller pair 13 on the downstream side of the sheet conveyance, and does not stay.

(3) When the first conveying roller pair 12 is rotated by 90 ° or more, the cutting mechanism 22 performs a re-cutting operation and applies an impact to the vicinity of the front end portion of the cut piece in the rearmost split region Sr1, so that the rearmost split The excised piece in the region Sr1 is discharged to the lower waste box 23 more reliably and promptly.

(4) Since the transport speed V2 of the rearmost end divided area Sr1 by the first transport roller pair 12 is higher than the normal transport speed V1, the efficiency of the work of discharging the excised piece of the rearmost end split area Sr1 is improved. be able to. In addition, the conveyance speed of the predetermined shredding region Sr0 and the cutting region Sr2 immediately before the last is the same as that during normal transportation. This is because, for the divided areas Sr0 and Sr2 other than the rearmost-end divided area Sr1, the stop position accuracy of the sheet is important in order to accurately cut into the predetermined dimensions Lr0 and Lr2, and therefore the stop position by increasing the rotation speed. This prevents a decrease in accuracy. On the other hand, for the rearmost divided region Sr1, the stop position accuracy is lowered, and even if the cutting position by the re-cutting operation is slightly shifted, the rearmost divided region Sr1 has a length of the predetermined dimension Lr1, and the cutting mechanism 22 And the first conveying roller pair 12 are discharged downward from the gap (D3), so there is no problem even if the value V2 is higher than the normal conveying speed V1. Further, since the first conveying roller pair 12 is maintained in the rotating state during the cutting operation, the operation from the recutting operation of the cut piece of the rearmost end divided region Sr1 to the discharging operation to the lower waste box 23 is continuously performed. Quickly.

Other embodiments

(1) The cutting mechanism of the above embodiment is composed of an upper movable blade and a lower fixed blade. However, the cutting mechanism according to the present invention is not limited to the above configuration, and the lower movable blade and the upper fixed blade. A cutting mechanism composed of a fixed blade may be used. In short, any configuration may be used as long as it includes at least a pair of cutting blades arranged to face each other via the conveyance surface and can cut the paper on the conveyance surface in a direction perpendicular to the conveyance direction.

(2) In the above embodiment, after the rear end of the rearmost divided region Sr1 passes through the nip position P2 of the first transport roller pair 12, the cutting is performed when the first transport roller pair 12 rotates 90 ° or more. The mechanism 22 performs the re-cutting operation and is controlled so that the rotation of the first conveying roller pair 12 is maintained during the re-cutting operation. A configuration in which the rotation of the conveyance roller pair 12 is stopped and the conveyance of the paper is stopped may be employed. In this case, an impact can be reliably applied to the vicinity of the front end portion of the cut piece in the rearmost end divided region Sr1 by performing the re-cutting operation in a state where the conveyance of the sheet is stopped. Further, after the re-cutting operation, the sheet conveyance of the first conveyance roller pair 12 may be resumed. In this case, the first conveying roller pair 12 operates so as to discharge the cut piece of the rearmost end divided region Sr1 to which the shock has been applied downward, so that it can be discharged to the lower waste box 23 more quickly. it can. Conversely, the re-cutting operation may not be performed. Even in this case, the rear end of the cut piece of the rearmost divided region Sr1 is guided forward and downward (downward downstream in the transport direction) in the lower transport roller 12B of the first transport roller pair 12, so that the last end The cut piece of the divided region Sr1 can be quickly discharged downward from the gap (D3) between the cutting mechanism 22 and the first conveying roller pair 12.

(3) The predetermined value Dn for determining whether or not to perform division cutting is substantially the same as the distance D1 between the cutting position P1 and the nip position P2 of the first conveying roller pair 12 on the upstream side in the embodiment. Although it is set to a value, it is also possible to set in the range of D1 ≦ Dn <(D1 + Lr0) in FIG.

(4) In the conveyance of the rearmost divided region Sr1, the conveyance speed by the first conveyance roller pair 12 when the first conveyance roller pair 12 is rotated by 90 ° or more is a normal conveyance depending on the paper quality and thickness of the paper It can be slower than the speed, or can be the same as the normal transport speed. For example, for a thin sheet whose surface is slippery, it is preferable to make the sheet slower than the normal conveyance speed so that slip can be prevented and the sheet can be reliably guided below the conveyance roller.

(5) The sheet processing apparatus according to the above embodiment includes the slit forming mechanism 20 that forms a slit parallel to the sheet conveying direction F together with the cutting mechanism 22 that cuts the sheet in the sheet conveying width direction W orthogonal to the sheet conveying direction F. And a fold forming mechanism 21 for forming a fold in the paper conveyance width direction W, but a paper processing apparatus having only a cutting mechanism, a cutting mechanism and other processing mechanisms (perforation forming mechanism, rounding forming mechanism, etc.) Needless to say, the present invention can also be applied to a sheet processing apparatus in which the number of processing mechanisms and conveyance roller pairs is different from that of the above embodiment.

12 First conveying roller pair 12A Upper conveying roller 12B Lower conveying roller 13 Second conveying roller pair 22 Cutting mechanism 22A Upper movable blade (an example of a cutting blade)
22B Lower fixed blade (an example of a cutting blade)
43 Roller drive unit 50 Cutting drive unit N Paper Q Product (delivery product)
Sr Rear end cut-out area Sr0 Divided area cut to a predetermined shred unit length Sr1 Last end divided area (removed piece of the last end divided area)
C, Cr Cutting line in the direction perpendicular to the paper conveyance direction Cr0, Cr1 Cutting line for division in the direction orthogonal to the paper conveyance direction Lr Length in the paper conveyance direction of the trailing edge excision area Lr1 Length in the paper conveyance direction of the trailing edge division area Lr0 Predetermined shred unit length Dn Predetermined value

Claims (4)

A cutting mechanism that cuts a sheet in a direction orthogonal to the sheet conveying direction by a pair of cutting blades disposed opposite to each other with the sheet conveying surface interposed therebetween, and a first conveying roller pair disposed on the sheet conveying upstream side of the cutting mechanism, A second conveyance roller pair disposed on the downstream side of the sheet conveyance of the cutting mechanism, a drive unit that drives the first and second conveyance roller pairs and the cutting mechanism, and a control unit that controls the operation of the drive unit; When the length (Lr) in the sheet conveyance direction of the trailing edge cutting area (Sr) of the sheet is larger than a predetermined value (Dn), the trailing edge cutting area (Sr) is sequentially formed from the downstream edge of the sheet conveyance. In the control method of the paper processing apparatus, cutting and dividing into a predetermined shredding unit length (Lr0),
The control unit is configured such that the length (Lr1) in the sheet conveyance direction of the rearmost end divided area (Sr1) in the rear edge cutting area (Sr) is determined between the cutting position (P1) of the cutting mechanism and the first conveying roller pair From the time when the length (D1) between the nip position (P2) and the rearmost end split region (Sr1) has completed passing through the nip position of the first conveying roller pair, the length is substantially equivalent to the distance (D1) between A control method for a sheet processing apparatus, wherein the drive unit is controlled so that the first conveying roller pair rotates by 90 ° or more. In the control method of the paper processing apparatus according to claim 1,
The sheet processing apparatus control method, wherein the cutting mechanism is controlled to perform a re-cutting operation on the rearmost end divided region (Sr1) after the first conveying roller pair is rotated by 90 ° or more. In the control method of the paper processing apparatus according to claim 2,
The first conveying roller pair is a control method of the sheet processing apparatus that is stopped during the re-cutting operation by the cutting mechanism. In the control method of the paper processing apparatus according to claim 3,
The control method of the paper processing apparatus, wherein the first conveying roller pair is controlled to resume rotation after the re-cutting operation by the cutting mechanism.

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