Sheet processing machine

Abstract

To provide a sheet processing machine that can position a rotary processing blade of a processing device with high accuracy.SOLUTION: A sheet processing machine 1 which processes a sheet while conveying a sheet 2 in a conveyance direction S, includes: processing devices 40, 50 which have rotary processing blades 45, 55; a drive shaft 35 which extends in a width direction W orthogonal to the conveyance direction and rotates the rotary processing blade; a shaft drive motor 14 which drives the drive shaft; rotation position detection means 70 which detects a rotation position of the drive shaft; a width direction drive motor 13 which moves the processing device in the width direction; and a control unit 6 which controls operations of the shaft drive motor and the width direction drive motor. The control unit controls the shaft drive motor so that the drive shaft is in a prescribed rotation position on the basis of the rotation position of the drive shaft detected by the rotation position detection method, and controls the width direction drive motor so that the processing device moves to a prescribed processing position while the drive shaft remains in the prescribed rotation position.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a sheet processing machine. [Background technology]

[0002] Patent Document 1 discloses a sheet processing machine equipped with a processing device having a processing blade that processes a sheet along the conveyance direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-319969 Summary of the Invention [Problem to be solved by the invention]

[0004] In the sheet processing machine of Patent Document 1, when the processing device is moved in the width direction perpendicular to the conveying direction and positioned relative to the processing reference position, the position of the processing device's cutting blade is not stable, and therefore positional deviation may occur each time the processing device is moved. In other words, in the sheet processing machine of Patent Document 1, it is difficult to position the processing device's cutting blade with high precision, and there is a risk of slight deviation in the processing position.

[0005] Therefore, a technical problem to be solved by the present invention is to provide a sheet processing machine capable of positioning the processing blade of the processing device with high precision. [Means for solving the problem]

[0006] In order to solve the above technical problems, according to the present invention, the following sheet processing machine is provided.

[0007] That is, the sheet processing machine according to the present invention comprises: A sheet processing machine that processes a sheet while conveying the sheet in a conveyance direction, a processing device having a processing blade; a drive shaft extending in a width direction perpendicular to the conveying direction and relating to the operation of the processing blade; a shaft drive motor that drives the drive shaft; a rotational position detecting means for detecting the rotational position of the drive shaft; a width direction drive motor that moves the processing device in the width direction; a control unit for controlling the operation of the shaft drive motor and the width direction drive motor, The control unit controls the axis drive motor based on the rotational position of the drive shaft detected by the rotational position detection means so that the drive shaft is at a predetermined rotational position, and controls the width direction drive motor so that the processing device moves to a predetermined processing position while the drive shaft is maintained at the predetermined rotational position.

[0008] According to the above configuration, the machining device is positioned at a predetermined machining position while the drive shaft is maintained at a predetermined rotational position, thereby stabilizing the position of the machining blade of the machining device, and therefore the machining blade of the machining device can be positioned with high precision. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a vertical cross-sectional view schematically showing the overall configuration of a sheet processing machine according to an embodiment of the present invention. [Figure 2] FIG. 2 is a functional block diagram of the sheet processing machine shown in FIG. [Figure 3] 2 is a schematic plan view of the main part of the sheet processing machine shown in FIG. 1 as seen from above. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 5 is an enlarged view of a main part of the sheet processing machine shown in FIG. [Figure 6] FIG. 6 is a perspective view of the main part shown in FIG. 5. [Figure 7] 2 is a perspective view of a third processing unit in the sheet processing machine shown in FIG. 1. FIG. [Figure 8] 8 is an enlarged view of a main part of the third machining unit shown in FIG. 7. [Figure 9] 8 is a perspective view of the third processing unit shown in FIG. 7 as seen from the opposite side. [Figure 10] 10 is an enlarged view of a main part of the third machining unit shown in FIG. 9. [Figure 11] 11 is a schematic plan view showing a state in which the drive shaft is rotated from the state shown in FIG. 10 and the detection target portion is detected by the rotational position sensor (a state in which the reflecting surface faces the detection surface). FIG. [Figure 12] 10A and 10B are diagrams illustrating detection of a processing reference position of a processing device in an ideal state. [Figure 13] 10A and 10B are diagrams illustrating detection of a processing reference position of a processing device tilted downward to the left. [Figure 14] 10A and 10B are diagrams illustrating detection of a processing reference position of a processing device tilted downward to the right. [Figure 15] 10 is a flowchart relating to positioning control of a processing device in a sheet processing machine. [Figure 16] 10A and 10B are diagrams illustrating a third stray light suppression structure. [Figure 17] 10A and 10B are diagrams illustrating a fourth stray light suppression structure. DETAILED DESCRIPTION OF THE INVENTION

[0010] The sheet processing machine 1 will be described below with reference to the drawings. For convenience of explanation, the upper and lower sides of the conveying path 20 of the sheet 2 will be referred to as "top" and "bottom," respectively, and the direction perpendicular to the conveying direction S (the horizontal direction perpendicular to the conveying direction S) will be referred to as the width direction W. Also, the "right side" and "left side" are defined as viewed from the upstream side of the conveying direction S. In this invention, the sheet 2 is, for example, paper, a thin resin plate, or a film.

[0011] (Overall configuration of sheet processing machine) As shown in FIG. 1, the sheet processing machine 1 includes a supply tray 11 and a discharge tray 12 on the upstream and downstream sides of a conveyance path 20 of a main body 10, respectively.

[0012] The main body 10 is equipped with a suction-type conveyor belt that feeds the sheets 2 placed on a supply tray 11 into the main body 10 one by one. Inside the main body 10, the sheets 2 are conveyed in a conveying direction S by a sheet conveying unit including a plurality of pairs of rollers 21 driven by a plurality of independent conveying motors (details of which will be described later) for each predetermined area. Thus, a conveying path 20 extending in the conveying direction S is formed by arranging the plurality of pairs of rollers 21 side by side in the conveying direction S. On the conveying path 20, a first processing unit 3, a second processing unit 4, a third processing unit 5, and the like are provided from the upstream side of the conveying path 20, passing through a conveying correction unit, an information reading unit, a reject unit, and the like (none of which are shown). The first processing unit 3, the second processing unit 4, and the third processing unit 5 are attached to the main body 10. The sheet processing machine 1 has a trash can 101 at the bottom of the main body 10 for collecting scraps generated during sheet processing.

[0013] The main body 10 is equipped with a control unit 6 for controlling various operations in the sheet processing machine 1. Fig. 2 is a functional block diagram of the sheet processing machine 1. The control unit 6 is, for example, a CPU (Central Processing Unit) and controls various operations in the sheet conveying unit, first processing unit 3, second processing unit 4, and third processing unit 5. The control unit 6 controls a width direction drive motor 13 and an axis drive motor 14, which will be described later. The control unit 6 controls various calculation processes, processing processes, and judgment processes through various memories and various input devices and output devices.

[0014] The control unit 6 is connected to various memories such as a ROM (Read Only Memory) in which various programs are stored, a RAM (Random Access Memory) in which various information is stored, and an EEPROM (Electrically Erasable and Programmable Read Only Memory).The control unit 6 is connected to an operation panel which has input units such as buttons and switches, an operation display unit having a display unit, and an alarm unit that notifies the occurrence of errors with sound and light.The operation display unit serves as an input unit for the operator to input data such as the number of sheets and processing information such as the processing position.

[0015] The control unit 6 is connected to sheet conveying drive sources such as a supply motor, a supply table lifting motor, and a main motor, and sheet processing drive sources such as a width direction drive motor 13, an axis drive motor 14, a cutting motor, and an option motor. The control unit 6 is also connected to various sensors such as a supply detection sensor, a sheet position detection sensor, a CCD sensor, a discharge sensor, a rotation position sensor 27, and a reference position sensor 65.

[0016] The width direction drive motor 13 and the shaft drive motor 14 are, for example, stepping motors. A stepping motor rotates the motor shaft in predetermined step units by applying a pulse signal, and the angle and speed of rotation can be accurately controlled, so the processing position of the processing device and the rotation position of the drive shaft 35 can be controlled quickly and accurately.

[0017] The control unit 6, in cooperation with a rotational position sensor 27 (described later), detects the rotational position of a detection target portion 72 that is fixed to one end 39 of the drive shaft 35 and rotates integrally with the drive shaft 35, and controls the shaft drive motor 14 so that the rotational position of the drive shaft 35 becomes a predetermined rotational position. The control unit 6, in cooperation with a reference position sensor 65 (described later), detects the processing reference position of the processing devices 40, 50, and controls the width direction drive motor 13 so that the processing devices 40, 50 move to predetermined processing positions based on the processing reference position.

[0018] (Processing unit) FIG. 3 is a schematic plan view of the main components of the sheet processing machine 1 shown in FIG. 1, viewed from above. As shown in FIG. 3, the sheet processing machine 1 has multiple processing units, such as a first processing unit 3 (not shown in FIG. 3), a second processing unit 4, and a third processing unit 5. The first processing unit 3, the second processing unit 4, and the third processing unit 5 are detachably attached to the main body side plates 25, 25 located on the left and right sides of the main body 10. The width-direction drive motors 13, 13 located on the left and right sides are attached to the outer surfaces of the main body side plates 25, 25 located on the left and right sides, respectively. Note that some of the width-direction drive motors 13 are not shown in FIG. 3. The shaft drive motor 14, which is shown in FIG. 2 but not shown in FIG. 3, is attached to the outer surface of the main body side plate 25 located on the right side (the other end side), for example.

[0019] For example, the first processing unit 3 performs perforation processing to form perforations along the conveyance direction of the sheet 2, the second processing unit 4 performs crease processing to form creases along the conveyance direction of the sheet 2, and the third processing unit 5 performs slit processing along the conveyance direction of the sheet 2. The third processing unit 5 will be described below, but the basic configuration is the same for the other processing units, i.e., the first processing unit 3 and the second processing unit 4. Note that in FIG. 3, the width direction drive motor 13 corresponding to the third processing unit 5 is illustrated on the right side, but the width direction drive motor 13 located on the left side, i.e., on the side of the rotation position sensor 27, is not illustrated.

[0020] Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. As shown in Fig. 4, the third machining unit 5 has a unit housing 30, one and the other screw shafts 34, 34, a drive shaft 35, a first guide shaft 36, a second guide shaft 37, upper machining devices 40, 40 located on the left and right sides, and lower machining devices 50, 50 located on the left and right sides.

[0021] The unit housing 30 has a unit top plate 31 and unit side plates 32, 32 located on the left and right sides. The unit side plate 32 has a unit side surface 33 on its outer surface. One and other screw shafts 34, 34, a drive shaft 35, a first guide shaft 36, and a second guide shaft 37 are supported by the unit side plates 32, 32 located on the left and right sides and are arranged to extend parallel to the width direction W between the unit side plates 32, 32 located on the left and right sides. The one and other screw shafts 34, 34 are provided at the same height in the upper part of the internal space of the unit housing 30. A first guide shaft 36 is provided below the one and other screw shafts 34, 34. A drive shaft 35 is provided below the first guide shaft 36. A second guide shaft 37 is provided below the drive shaft 35.

[0022] The upper processing device 40 and the lower processing device 50 located on the left side are configured to be integrated. One of the screw shafts 34, a first guide shaft 36, a second guide shaft 37, and a drive shaft 35 are used to operate the upper processing device 40 and the lower processing device 50 located on the left side. One of the screw shafts 34 is driven by a width-direction drive motor 13 located on the left side via a width-direction drive mechanism such as a gear. When one of the screw shafts 34 rotates, the upper processing device 40 and the lower processing device 50 located on the left side move in the width direction W along the first guide shaft 36 and the second guide shaft 37.

[0023] The upper processing device 40 located on the left side has an upper housing 41. One screw shaft 34 is threaded into the upper part of the upper housing 41, and when the one screw shaft 34 rotates, the upper housing 41 moves in the width direction W along the first guide shaft 36. The lower processing device 50 located on the left side has a lower housing 51. The lower housing 51 is connected to the upper housing 41. Therefore, the lower housing 51 moves in the width direction W along the second guide shaft 37 together with the upper housing 41.

[0024] The upper processing device 40 and the lower processing device 50 located on the right side are configured to be integrated. The other screw shaft 34, the first guide shaft 36, the second guide shaft 37, and the drive shaft 35 are used to operate the upper processing device 40 and the lower processing device 50 located on the right side. The other screw shaft 34 is driven by the width-direction drive motor 13 located on the right side via a width-direction drive mechanism such as a gear. When the other screw shaft 34 rotates, the upper processing device 40 and the lower processing device 50 located on the right side move in the width direction W along the first guide shaft 36 and the second guide shaft 37.

[0025] The upper processing device 40 located on the right side has an upper housing 41. The other screw shaft 34 is threaded into the upper part of the upper housing 41, and when the other screw shaft 34 rotates, the upper housing 41 moves in the width direction W along the first guide shaft 36. The lower processing device 50 located on the right side has a lower housing 51. The lower housing 51 is connected to the upper housing 41. Therefore, the lower housing 51 moves in the width direction W along the second guide shaft 37 together with the upper housing 41.

[0026] The upper housings 41, 41 located on the left and right sides each have, for example, an upper rotary blade 45. The lower housings 51, 51 located on the left and right sides each have, for example, a lower rotary blade 55. The upper rotary blade 45 and the lower rotary blade 55 are processing blades. The upper rotary blade 45 is a rotary blade that rotates together with the drive shaft 35. The lower rotary blade 55 is a rotary blade that slides against the upper rotary blade 45 and rotates in accordance with the rotation of the upper rotary blade 45. A processing action portion C is formed by the upper rotary blade 45 and the lower rotary blade 55.

[0027] A key groove extending in the width direction W is formed on the outer peripheral surface of the drive shaft 35, and a key that fits into the key groove is provided on the inner peripheral surface of the boss portion of the upper rotary blade 45. As a result, the boss portion of the upper rotary blade 45 is fitted onto the outer peripheral surface of the drive shaft 35 so as to be freely movable in the width direction W and is key-coupled to the drive shaft 35 so as to rotate integrally with the drive shaft 35.

[0028] The lower processing devices 50, 50 located on the left and right sides each have an extension portion 60, 60. The extension portion 60 extends downward from the lower portion of the lower processing device 50. The extension portion 60 has a reference end 61, which serves as a processing reference position. The reference end 61 is formed at the lower end of the extension portion 60. A reference position sensor 65 is provided to detect the reference end 61. The reference position sensor 65 is supported on the main body side plate 25 by a second stay 69. The reference position sensor 65 is a transmission-type optical sensor having a pair of a light-emitting element 65a and a light-receiving element 65b. When the reference end 61 passes between the light-emitting element 65a and the light-receiving element 65b, the reference end 61 is detected by the measurement light emitted from the light-emitting element 65a being blocked, or by the blocked measurement light being incident on the light-receiving element 65b.

[0029] (Rotational position detection means) The rotational position detection means 70 will be described with reference to FIGS. 4 to 11, 16, and 17. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. FIG. 5 is an enlarged view of the essential parts of the sheet processing machine shown in FIG. 4. FIG. 6 is a perspective view of the essential parts shown in FIG. 5. FIG. 7 is a perspective view of the third processing unit in the sheet processing machine shown in FIG. 1. FIG. 8 is an enlarged view of the essential parts of the third processing unit shown in FIG. 7. FIG. 9 is a perspective view of the third processing unit shown in FIG. 7 from the opposite side. FIG. 10 is an enlarged view of the essential parts of the third processing unit shown in FIG. 9. FIG. 11 is a schematic plan view showing a state in which the rotational position sensor 27 detects the detection target portion 72 after the drive shaft 35 is rotated from the state shown in FIG. 10 (the reflection surface 76 faces the detection surface 28). FIG. 16 is a diagram illustrating a third stray light suppression structure 83. FIG. 17 is a diagram illustrating a fourth stray light suppression structure 85.

[0030] As shown in Figures 4, 7 and 9, the rotational position detection means 70 is disposed on the side opposite to the other end where the shaft drive motor 14 (not shown) is disposed, i.e., on one end of the main body 10. The rotational position detection means 70 is disposed, for example, on the left side of the main body 10 when viewed from the upstream side in the conveying direction S. This prevents the rotational position detection means 70 from interfering with the shaft drive motor 14. The rotational position detection means 70 has a detection target 72 and a rotational position sensor 27. The rotational position sensor 27 is disposed at a distance from the detection target 72.

[0031] The detected portion 72 is fixed to one end portion 39 located on one end side (left side) of the drive shaft 35 and rotates integrally with the drive shaft 35. The rotation speed of the drive shaft 35 when processing the sheet 2 is very high, but the rotation speed of the drive shaft 35 when detecting the rotational position of the drive shaft 35 is preferably low so that the rotational position of the detected portion 72 can be detected. The detected portion 72 is fixed to the one end portion 39, for example, by screws. The detected portion 72 is preferably located radially outward of the drive shaft 35. This makes it possible to suppress stray light reflected by the end portion (end face) of the drive shaft 35. The detected portion 72 has a reflecting portion 75 bent into an L shape. The reflecting portion 75 has a reflecting surface 76 on the side facing the rotational position sensor 27.

[0032] The rotational position sensor 27 is supported on the main body side panel 25 by a first stay 29 attached to an installation opening formed in the main body side panel 25. The rotational position sensor 27 is, for example, a reflective optical sensor having a detection surface 28 on which a pair of light-emitting element 27a and light-receiving element 27b is provided. The light-emitting element 27a emits measurement light A1. The light-receiving element 27b receives reflected light A2, which is the measurement light A1 reflected by the reflecting surface 76. The measurement light A1 is, for example, infrared light.

[0033] As shown in FIG. 11 , the detection surface 28 of the rotational position sensor 27 faces parallel to the reflecting surface 76 of the reflecting unit 75 but faces non-parallel to the unit side surface 33 of the unit side panel 32. That is, the detection surface 28 intersects with the unit side surface 33 at a certain angle. The unit side surface 33 is the surface of the unit side panel 32 facing the detection surface 28. In the rotational position sensor 27, the reflecting surface 76 of the rotating reflecting unit 75 reflects the measurement light A1 emitted from the light-emitting unit 27a, and the reflected light A2 reflected by the reflecting surface 76 is received by the light-receiving unit 27b, thereby detecting the rotational position of the detection target 72. This enables non-contact rotational position detection to be achieved with high accuracy and low cost. Note that the measurement light A1 that travels directly without being reflected by the reflecting surface 76 becomes stray light B1.

[0034] The detection surface 28 intersects with the unit side surface 33 at an intersection angle of, for example, 5 to 15 degrees, e.g., 10 degrees. In other words, the detection surface 28 faces the unit side surface 33 non-parallel to prevent stray light B1 from entering. This prevents stray light B1 that is not reflected by the reflecting surface 76 from entering the light receiving unit 27b, thereby improving the detection accuracy of the rotational position with a simple configuration. Therefore, the detection surface 28 that faces the unit side surface 33 non-parallel acts as a first stray light suppression structure.

[0035] 6, 9, 10, and 11, a low-reflection portion 80 is disposed in a stray-light generating region on the unit side surface 33 of the unit side plate 32. The low-reflection portion 80 has low reflectivity in the wavelength region of the measurement light A1. The stray-light generating region on the unit side surface 33 is a region where stray light B1 is generated by the incidence and reflection of the measurement light A1 when the reflecting surface 76 of the rotating reflecting portion 75 does not face the detection surface 28.

[0036] The low-reflection section 80 absorbs the measurement light A1 from the light-emitting section 27a and suppresses reflection, thereby suppressing stray light B1 from entering the light-receiving section 27b, thereby improving the detection accuracy of the rotational position with a simple configuration. The low-reflection section 80 is, for example, a black resin sheet with a foam structure. Other examples of the low-reflection section 80 include a sheet in which finely cut black-dyed fibers are densely and uniformly planted upright on a substrate, or a black-painted section in which the stray-light generating area of ​​the unit side surface 33 is painted black. The low-reflection section 80 functions as a second stray-light suppression structure.

[0037] In addition to being realized by the configuration in which the detection surface 28 of the rotational position sensor 27 faces the unit side surface 33 of the unit side plate 32 non-parallel as described above, the stray light suppression structure can also be realized by, for example, the following configuration.

[0038] As shown in FIG. 16 , a first inclined surface 83 is disposed on a thick unit side plate 32. The unit side plate 32 is a metal plate having a thickness sufficient to form the recess 82, and has a thickness of, for example, 10 mm. The detection surface 28 of the rotational position sensor 27 faces parallel to the unit side surface 33 of the unit side plate 32. The recess 82 is formed, for example, by cutting, on the side of the unit side surface 33 facing the detection surface 28 of the rotational position sensor 27. The recess 82 has a first inclined surface 83 facing non-parallel to the detection surface 28 on the side of the light-emitting unit 27a of the rotational position sensor 27. The first inclined surface 83 intersects with the detection surface 28 at an intersecting angle of, for example, 5 to 15 degrees, e.g., 10 degrees.

[0039] When the reflecting surface 76 of the rotating reflecting unit 75 does not face the detection surface 28, the measurement light A1 reaches the unit side panel 32 as stray light B1. However, because the first inclined surface 83 faces the detection surface 28 non-parallel, the stray light B1 is deflected by the first inclined surface 83 in a direction different from the light-receiving unit 27b. This causes the stray light B1 to become deflected stray light B2, which can be prevented from entering the light-receiving unit 27b, thereby improving the detection accuracy of the rotational position with a simple configuration. Therefore, the structure in which the first inclined surface 83 faces the detection surface 28 non-parallel functions as a third stray light suppression structure.

[0040] As shown in FIG. 17 , a bent portion 84 is disposed on a thin unit side plate 32. The unit side plate 32 is a metal plate having a thickness that allows it to be bent, e.g., 2 mm. The detection surface 28 of the rotational position sensor 27 faces parallel to the unit side surface 33 of the unit side plate 32. The bent portion 84 is bent away from the detection surface 28 of the rotational position sensor 27. The bent portion 84 has a second inclined surface 85 that faces non-parallel to the detection surface 28 on the side of the unit side surface 33 that faces the detection surface 28. The second inclined surface 85 intersects with the detection surface 28 at an intersecting angle of, e.g., 5 to 15 degrees, e.g., 10 degrees.

[0041] When the reflecting surface 76 of the rotating reflecting unit 75 does not face the detection surface 28, the measurement light A1 from the light-emitting unit 27a reaches the unit side panel 32 as stray light B1. However, because the second inclined surface 85 faces the detection surface 28 non-parallel, the stray light B1 is deflected by the second inclined surface 85 in a direction different from that of the light-receiving unit 27b. This causes the stray light B1 to become deflected stray light B2, which can be prevented from entering the light-receiving unit 27b, thereby improving the detection accuracy of the rotational position with a simple configuration. Therefore, the structure in which the second inclined surface 85 faces the detection surface 28 non-parallel functions as a fourth stray light suppression structure.

[0042] (Cause of misalignment) The causes of positional deviation of the processing devices 40, 50 have been examined and will be explained with reference to Figs. 12 to 14. Fig. 12 is a diagram illustrating detection of the processing reference position of the processing devices 40, 50 in an ideal state. Fig. 13 is a diagram illustrating detection of the processing reference position of the processing devices 40, 50 in a state tilted downward to the left. Fig. 14 is a diagram illustrating detection of the processing reference position of the processing devices 40, 50 in a state tilted downward to the right.

[0043] As shown in FIG. 12, consider a case where the drive shaft 35 extends linearly in the width direction W and the drive shaft 35, first guide shaft 36, and second guide shaft 37 are parallel (i.e., an ideal case). In this case, the processing area C of the upper processing device 40 and the lower processing device 50 is located on an extension line (shown by a dashed line) passing through the reference end 61. That is, both the processing area C and the reference end 61 are located on the single extension line shown by the dashed line in FIG. 12. The single extension line shown by the dashed line extends in a direction perpendicular to the extension directions of the drive shaft 35, first guide shaft 36, and second guide shaft 37. For example, the reference end 61 located on the extension line is detected by a reference position sensor 65 supported on the main body side plate 25 by a second stay 69. For the sake of simplicity, both the processing action portion C and the reference end 61 are positioned on a single extension line shown by a dotted line, but either the processing action portion C or the reference end 61 may be positioned at a position offset from the single extension line shown by the dotted line.

[0044] 12, rotation of the screw shaft 34 causes the upper processing device 40 and the lower processing device 50 to move smoothly in the width direction W along the first guide shaft 36 and the second guide shaft 37, respectively. The position of the processing operation part C corresponding to the detection position of the reference end 61 detected by the reference position sensor 65 does not vary depending on the positions of the upper processing device 40 and the lower processing device 50 in the width direction W and the rotational position of the drive shaft 35.

[0045] However, as described above, a key groove extending in the width direction W is formed on the outer peripheral surface of the drive shaft 35. When the key groove is machined, slight warping or distortion occurs in the drive shaft 35. Therefore, in reality, the drive shaft 35 rarely extends linearly in the width direction W, but is slightly warped.

[0046] Although exaggerated in FIG. 13 , consider a case where the drive shaft 35 is slightly warped, causing the upper processing device 40 and the lower processing device 50 to tilt slightly downward to the left. In this case, the position of the reference position sensor 65 that detects the reference end 61 is fixedly supported by the main body side plate 25 and is not affected by the downward tilt of the upper processing device 40 and the lower processing device 50. However, the position of the processing operation portion C is affected by the downward tilt of the upper processing device 40 and the lower processing device 50, preventing both the processing operation portion C and the reference end 61 from being positioned on a single extended line shown by the dashed line in FIG. 12 . As a result, two extended lines exist: one passing through the processing operation portion C (shown by the dashed line on the left in FIG. 13 ) and the other passing through the reference end 61 (shown by the dashed line on the right in FIG. 13 ). The two extended lines are separated by a first distance X1 in the width direction W, for example. The first distance X1 in the width direction W varies depending on the rotational position of the drive shaft 35, making it difficult to position the processing action portion C with high precision using the detection position of the reference end 61 as a reference.

[0047] As shown in an exaggerated manner in FIG. 14 , consider a case where the drive shaft 35 is slightly warped, causing the upper processing device 40 and the lower processing device 50 to tilt slightly downward to the right. In this case, the position of the reference position sensor 65 that detects the reference end 61 is fixedly supported by the main body side plate 25 and is therefore not affected by the downward tilt of the upper processing device 40 and the lower processing device 50. However, the position of the processing operation portion C is affected by the downward tilt of the upper processing device 40 and the lower processing device 50, preventing both the processing operation portion C and the reference end 61 from being positioned on a single extended line shown by the dashed line in FIG. 12 . As a result, two extended lines exist: one passing through the processing operation portion C (shown by the dashed line on the right in FIG. 14 ) and the other passing through the reference end 61 (shown by the dashed line on the left in FIG. 14 ). The two extended lines are spaced apart by a second distance X2 in the width direction W, for example. The second distance X2 in the width direction W varies depending on the rotational position of the drive shaft 35, making it difficult to position the processing action portion C with high precision using the detection position of the reference end 61 as a reference.

[0048] In reality, tilting of the upper processing device 40 and the lower processing device 50 occurs due to warping or distortion of the drive shaft 35. Therefore, the positions of the processing blades 45, 55 of the processing devices 40, 50 (i.e., the position of the processing action portion C) based on the detected position of the reference end 61 vary depending on the positions of the processing devices 40 and the lower processing device 50 in the width direction W and the rotational position of the drive shaft 35. As a result, it is difficult to position the processing blades 45, 55 of the processing devices 40, 50 (i.e., the processing action portion C) with high precision. Therefore, in the present invention, the rotational position detection means 70 detects the rotational position of the drive shaft 35, and the shaft drive motor 14 is controlled based on the detected rotational position of the drive shaft 35 so that the drive shaft 35 is at a predetermined rotational position.

[0049] The control unit 6 controls the processing devices 40, 50 to be positioned at predetermined processing positions in the width direction W while maintaining the drive shaft 35 at a predetermined rotational position. As a result, the positions of the upper processing device 40 and the lower processing device 50 in the width direction W, with the reference end 61 serving as the processing reference position, are not affected by fluctuations in the rotational position of the drive shaft 35. Therefore, by positioning the processing devices 40, 50 at predetermined processing positions while maintaining the drive shaft 35 at a predetermined rotational position, the positions of the processing blades 45, 55 of the processing devices 40, 50 (i.e., the positions of the processing action portions C) are stabilized, allowing the processing blades 45, 55 of the processing devices 40, 50 to be positioned with high precision. Note that the predetermined rotational position may be set to a certain rotational position for one processing device 40, 50, while being set to a different rotational position different from the certain rotational position for another processing device 40, 50.

[0050] (Positioning control of processing equipment) The positioning control of the processing devices 40, 50 in the sheet processing machine 1 will be described with reference to Fig. 15. Fig. 15 is a flowchart relating to the positioning control of the processing devices 40, 50 in the sheet processing machine 1.

[0051] 15, in step S1, positioning control of the processing devices 40, 50 in the sheet processing machine 1 begins. In step S3, the control unit 6 controls the width-direction drive motor 13 so that the processing devices 40, 50 move toward the reference position. In step S5, the reference position sensor 65 detects the reference edge 61 of the processing devices 40, 50. In step S7, the control unit 6 controls the width-direction drive motor 13 so that the processing devices 40, 50 stop after moving a predetermined number of steps.

[0052] In step S9, the control unit 6 controls the shaft drive motor 14 so that the drive shaft 35 is at a predetermined rotation position. In step S11, the control unit 6 controls the width direction drive motor 13 so that the processing devices 40, 50 move toward the processing position. In step S13, when the reference position sensor 65 no longer detects the reference end 61 of the processing devices 40, 50, in step S15, the control unit 6 resets the position information of the processing devices 40, 50 stored in memory and sets the processing reference position.

[0053] In step S17, the control unit 6 controls the width direction drive motor 13 so that the processing devices 40, 50 move to predetermined processing positions while maintaining the drive shaft 35 at a predetermined rotational position, and stop at the predetermined processing position. In step S19, the control unit 6 controls the shaft drive motor 14 so that the processing devices 40, 50 perform the predetermined processing. When the predetermined processing by the processing devices 40, 50 is completed, in step S20, the positioning control of the processing devices 40, 50 in the sheet processing machine 1 is completed.

[0054] Although specific embodiments of the present invention have been described, the present invention is not limited to the above embodiments and can be implemented with various modifications within the scope of the present invention. For example, an appropriate combination of the contents described in the above embodiments may be an embodiment of the present invention. Furthermore, the specific numbers shown in the above embodiments are merely examples to facilitate understanding of the present invention and do not limit the present invention.

[0055] In the above embodiment, the drive shaft 35 that rotates and drives the upper rotary blade 45 for processing the sheet 2 is exemplified. However, in a broader sense, the drive shaft 35 in this invention extends in the width direction W perpendicular to the conveying direction S and is involved in the operation of the processing blade 45. This invention is also applicable to, for example, a cam rotation shaft in a rotary blade lifting mechanism disclosed in Japanese Patent Application Laid-Open No. 2013-103311, in which the rotary blade is moved toward and away from the rotary receiving blade by a cam member that rotates together with a cam rotation shaft (corresponding to the drive shaft in this invention) extending in the width direction. This invention is also applicable to a drive shaft that rotates and drives the rotary receiving blade in Japanese Patent Application Laid-Open No. 2013-103311.

[0056] Examples of the processing blades 45, 55 for processing the sheet 2 include the above-mentioned slit processing blade, as well as a perforation processing blade and a crease processing blade.

[0057] In the above embodiment, the upper processing device 40 and the lower processing device 50 are configured as an integral unit, and moving either one of them moves the upper processing device 40 and the lower processing device 50 as an integral unit. However, the upper processing device 40 and the lower processing device 50 may be configured as independent units that move independently. Furthermore, the upper rotary blade 45 and the lower rotary blade 55 may be rotationally driven by two independent drive shafts. This invention is applicable to each of these two independent drive shafts. Furthermore, the upper rotary blade 45 may be configured as a driven unit, and only the lower rotary blade 55 may be rotationally driven, and this invention may be applied only to the drive shaft of the lower rotary blade 55.

[0058] The present invention and its embodiments can be summarized as follows.

[0059] A sheet processing machine 1 according to one embodiment of the present invention includes: A sheet processing machine 1 processes a sheet 2 while conveying the sheet 2 in a conveying direction S, Processing devices 40, 50 having processing blades 45, 55; a drive shaft 35 extending in a width direction W perpendicular to the conveying direction S and relating to the operation of the processing blades 45, 55; a shaft drive motor 14 for driving the drive shaft 35; a rotational position detection means 70 for detecting the rotational position of the drive shaft 35; a width direction drive motor 13 that moves the processing devices 40, 50 in the width direction W; a control unit 6 for controlling the operation of the shaft drive motor 14 and the width direction drive motor 13; The control unit 6 controls the axis drive motor 14 based on the rotational position of the drive shaft 35 detected by the rotational position detection means 70 so that the drive shaft 35 is at a predetermined rotational position, and controls the width direction drive motor 13 so that the processing devices 40, 50 move to predetermined processing positions while the drive shaft 35 is maintained at the predetermined rotational position.

[0060] According to the above configuration, the machining devices 40, 50 are positioned at predetermined machining positions while the drive shaft 35 is maintained at a predetermined rotational position, thereby stabilizing the positions of the machining blades 45, 55 of the machining devices 40, 50, and allowing the machining blades 45, 55 of the machining devices 40, 50 to be positioned with high precision.

[0061] In addition, in the sheet processing machine 1 of one embodiment, The processing devices 40 and 50 have a reference end 61 that serves as a processing reference position when moving in the width direction W, The width direction drive motor 13 moves the processing devices 40 and 50 based on the processing reference position.

[0062] According to the above configuration, the processing devices 40, 50 can be moved in the width direction W with high precision.

[0063] In addition, in the sheet processing machine 1 of one embodiment, The rotation position detection means 70 a detection target portion 72 fixed to one end portion 39 of the drive shaft 35 and positioned radially outward of the drive shaft 35; and a rotational position sensor 27 for detecting the rotational position of the detection target portion 72.

[0064] According to the above configuration, stray light reflected by the end (end face) of the drive shaft 35 can be suppressed.

[0065] In addition, in the sheet processing machine 1 of one embodiment, The detected portion 72 has a reflective surface 76, the rotational position sensor 27 is a reflective optical sensor having a detection surface 28 provided with a light-emitting portion 27a that emits measurement light A1 and a light-receiving portion 27b that receives reflected light A2 obtained by reflecting the measurement light A1 on the reflecting surface 76, The reflecting surface 76 is configured to face the detection surface 28 at a distance.

[0066] According to the above configuration, non-contact rotational position detection can be achieved with high accuracy and at low cost.

[0067] In addition, in the sheet processing machine 1 of one embodiment, The optical element 27 includes stray light suppression structures 28, 80, 83, and 85 that suppress stray light B1 that is not reflected by the reflecting surface 76 from entering the light receiving portion 27b.

[0068] According to the above configuration, the accuracy of detecting the rotational position can be improved.

[0069] In addition, in the sheet processing machine 1 of one embodiment, The stray light suppression structure 28 is the detection surface 28 that faces non-parallel to the unit side surface 33 of the unit side plate 32 that supports the drive shaft 35 .

[0070] According to the above configuration, the accuracy of detecting the rotational position can be improved with a simple configuration.

[0071] In addition, in the sheet processing machine 1 of one embodiment, The stray light suppression structure 80 is disposed on the unit side surface 33 of the unit side plate 32 that supports the drive shaft 35, and is a low-reflectivity portion 80 that has low reflectivity in the wavelength region of the measurement light A1.

[0072] According to the above configuration, the accuracy of detecting the rotational position can be improved with a simple configuration.

[0073] In addition, in the sheet processing machine 1 of one embodiment, The stray light suppression structures 83, 85 are inclined surfaces 83, 85 that are arranged on the unit side surface 33 of the unit side plate 32 that supports the drive shaft 35 and face the detection surface 28 non-parallel.

[0074] According to the above configuration, the accuracy of detecting the rotational position can be improved with a simple configuration. [Explanation of symbols]

[0075] 1...Sheet processing machine 2...Sheet 3...First processing unit 4...Second processing unit 5...Third processing unit 6...CPU (control unit) 10...Main unit 11...Supply tray 12...Outlet tray 13...Width direction drive motor 14...Axis drive motor 20...Transportation route 21...Laura 25...Main body side panel 27...Rotational position sensor 27a...Light emitting part 27b...Light receiving section 28...Detection surface (first stray light suppression structure) 29...First stage 30...Unit housing 31...Unit upper plate 32...Unit side panel 33...Unit side 34...Screw shaft 35...Drive shaft 36...First guide shaft 37...Second guide shaft 39...One end 40…Upper processing equipment (processing equipment) 41...Upper housing 45...Upper rotary blade (processing blade) 50…Preparation equipment (processing equipment) 51...Lower housing 55...Lower rotary blade (processing blade) 60...Extension part 61...Reference end 65...Reference position sensor 65a...Light emitting part 65b...Light receiving section 69...Second stage 70...Rotational position detection means 72...detection part 75…Reflector 76…Reflective surface 80...Low reflection portion (second stray light suppression structure) 82...recess 83...First inclined surface (third stray light suppression structure) 84...Bending part 85...Second inclined surface (fourth stray light suppression structure) 101...Trash can A1...Measuring light A2…Reflected light B1…Stray light B2…Deflected stray light C…Machining action part S...Transport direction W: Width direction X1…1st distance X2…Second distance

Claims

1. A sheet processing machine that processes a sheet while conveying the sheet in a conveyance direction, a processing device having a rotary processing blade; a drive shaft extending in a width direction perpendicular to the conveying direction and rotating the rotary processing blade; a shaft drive motor that drives the drive shaft; a rotational position detecting means for detecting the rotational position of the drive shaft; a width direction drive motor that moves the processing device in the width direction; a reference position sensor that detects a reference end provided on the processing device, the reference end being a processing reference position in the width direction when the processing device moves in the width direction; a control unit for controlling the operation of the shaft drive motor and the width direction drive motor, The control unit controlling the shaft drive motor based on the rotational position of the drive shaft detected by the rotational position detection means so that the drive shaft is at a predetermined rotational position; The width direction drive motor is controlled so that the processing device is moved in the width direction while the drive shaft is maintained at the predetermined rotation position, and the reference end is detected as the processing reference position by the reference position sensor. A sheet processing machine characterized in that the width direction drive motor is controlled so that the processing device moves to a predetermined processing position based on the processing reference position while the drive shaft maintains the predetermined rotational position.

2. A sheet processing machine as described in Claim 1, wherein in the processing device, the reference end is provided at a position spaced apart from the rotary processing blade in a direction perpendicular to the drive shaft.

3. The rotational position detection means a detection target portion fixed to one end of the drive shaft and positioned radially outward of the drive shaft; 2. The sheet processing machine according to claim 1, further comprising a rotational position sensor for detecting the rotational position of the detection target portion.

4. the detected part has a reflective surface, the rotational position sensor is a reflective optical sensor having a detection surface provided with a light-emitting unit that emits measurement light and a light-receiving unit that receives reflected light of the measurement light reflected by the reflection surface, The sheet processing machine according to claim 3, wherein the reflecting surface is configured to face the detecting surface at a distance.

5. The sheet processing machine according to claim 4, further comprising a stray light suppression structure that suppresses stray light that is not reflected by the reflecting surface from entering the light receiving section.

6. 6. The sheet processing machine according to claim 5, wherein the stray light suppression structure is the detection surface that faces non-parallel to a unit side surface of a unit side plate that supports the drive shaft.

7. The sheet processing machine according to claim 5, characterized in that the stray light suppression structure is arranged on the side surface of the unit side plate that supports the drive shaft, and is a low-reflection portion that has low reflectivity in the wavelength region of the measurement light.

8. 6. The sheet processing machine according to claim 5, wherein the stray light suppression structure is disposed on a side surface of a unit side plate that supports the drive shaft, and is an inclined surface that faces non-parallel to the detection surface.

9. the drive shaft has a key groove extending in the width direction, 2. The sheet processing machine according to claim 1, wherein the rotary processing blade has a key that fits into the key groove.

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