JP2016216214A - Sheet inversion mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet inversion mechanism that can be easily switched between a carrying mode for single-side carrying and a carrying mode for double-side carrying so as to reduce a burden on an operator.SOLUTION: The sheet inversion mechanism comprises an inversion trunk and an inversion gripping claw device. The inversion gripping claw device comprises: an outer shaft having a first claw piece and a first pinion; an inner shaft having a second claw piece and a second pinion; a first driving portion having a sector gear which engages with the first pinion; and a second driving portion having a sector gear which engages with the second pinion. The first and second driving portions comprise a supporting member provided slidably in the inversion trunk, a cam follower 72 and a sector gear provided in the supporting member, a cam 76 provided in a frame 24, and an actuator 78 which moves the cam 76 in a shaft line direction. A cam face of the cam 76 is constituted of a cam face 74 for single-side carrying and a cam face 75 for inverse carrying arranged in the shaft line direction. The actuator 78 moves the cam 76 between a position where the cam follower 72 is in contact with the cam face 74 for single-side carrying and a position where the cam follower 72 is in contact with the cam face 75 for inverse carrying.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a sheet reversing mechanism capable of reversing the front and back of a sheet when the sheet is transferred between two conveying cylinders.

  As a conventional sheet reversing mechanism of this type, there is one described in Patent Document 1, for example. The sheet reversing mechanism disclosed in Patent Document 1 is used in a printing machine, and includes a reversing gripper device for transferring a single sheet from a transfer cylinder to an impression cylinder, and a driving device that drives the reversing gripping claw device. And.

  The reverse gripping claw device includes a pair of gripping claw pieces that sandwich a single sheet. The pair of gripping claw pieces are provided on a reversing cylinder located between the transfer cylinder and the impression cylinder. This reversing gripper device adopts one of two types of transport forms. The two types of conveyance modes are a single-sided conveyance mode in which a single sheet received from the transfer cylinder is transferred to the impression cylinder without being reversed, and a reverse conveyance pattern in which the single sheet received from the transfer cylinder is reversed and transferred to the impression cylinder.

The drive device includes two types of cams fixed to a frame that supports the reversing cylinder, and a cam follower that contacts one of these cams.
The two types of cams are a cam for realizing the above-described single-sided conveyance mode and a cam for realizing the reverse conveyance mode. These cams are arranged in the axial direction of the reversing cylinder.
The cam follower is supported by a support member swingably provided on the reversing cylinder so as to be movable in the axial direction of the reversing cylinder. That is, the cam follower contacts one of the two types of cams when moved to one of the axial directions, and contacts the other cam when moved to the other axial direction.

The support member constitutes a part of a transmission mechanism that transmits the displacement of the cam follower to the claw piece.
In the reversing gripper device, switching between the two types of conveyance modes described above is performed by moving the cam follower in the axial direction of the reversing cylinder and changing the cam that the cam follower contacts. This switching operation is performed manually by an operator.

JP 50-130507 A

  In the sheet reversing mechanism described in Patent Document 1, in order to switch the conveyance mode of the reversing gripper device, the operator must hold the cam follower by hand and move it to one or the other in the axial direction of the reversing cylinder. . Moreover, this operation must be performed in a narrow space in the printing press. For this reason, this switching operation is troublesome and increases the burden on the operator.

  The present invention has been made to solve such a problem, and when switching the conveyance mode of the reversing gripper claw device to one of the conveyance mode for single-sided conveyance and the conveyance mode for double-sided conveyance, this switching is facilitated. An object of the present invention is to provide a sheet reversing mechanism that can be performed and can reduce the burden on the operator.

  In order to achieve this object, a sheet reversing mechanism according to the present invention includes a reversing cylinder that is positioned and rotated between an upstream conveying cylinder and a downstream conveying cylinder for sheet conveyance, and a holding provided in the reversing cylinder. It has a transport function for receiving a sheet from the upstream transport cylinder using a claw and passing the sheet to the downstream transport cylinder, and transports one of two types of transport modes in which this transport function is realized. A reversing gripper device that can be switched to a form, and the two types of conveying forms are: a single-sided conveying form that passes the sheet received from the upstream conveying cylinder to the downstream conveying cylinder without being inverted; and the upstream conveying A reversing conveyance mode in which the sheet received from the cylinder is reversed and passed to the downstream conveying cylinder, and the reversing gripper device is rotatable to the reversing cylinder in a state in which the reversing cylinder and the axis are parallel to each other. A cylindrical first claw shaft held by the first claw shaft, a plurality of first claw provided on the first claw shaft in a state of being spaced apart in the axial direction of the first claw shaft, In a state in which the first pinion provided at one end of the one claw shaft in the axial direction, the first drive unit having a sector gear meshing with the first pinion, and the axis of the inversion cylinder are parallel to each other. A second claw shaft provided in the first claw shaft so as to be rotatable with respect to the first claw shaft and the second claw shaft in a state of being arranged at intervals in the axial direction of the second claw shaft. A plurality of second claws provided on the second claw shaft, a second pinion provided at the other end portion in the axial direction of the second claw shaft, and a sector gear meshing with the second pinion A second drive unit having a first drive unit, and the first drive unit and the second drive unit are end portions in the axial direction of the inversion cylinder. A support member supported pivotably about an axis parallel to the axis of the reversing cylinder at a position facing the frame that rotatably supports the end of the reversing cylinder, and the frame in the axial direction. A cam that is movably supported and has a cam surface extending in a rotation direction of the reversing cylinder in a state of being directed to the outside in the radial direction of the reversing cylinder, the sector gear provided on the support member, and the support member A cam follower provided in contact with the cam surface of the cam and an actuator for moving the cam in the axial direction, the cam surface of the cam being used when the single-sided conveyance mode is adopted. A cam surface for reversal conveyance and a cam surface for reversal conveyance used when the reversal conveyance mode is adopted. The cam surface for single-side conveyance and the cam surface for reversal conveyance are arranged side by side in the axial direction. And the actuator moves the cam in the axial direction between a single-sided conveyance position where the cam follower contacts the cam surface for single-sided conveyance and a reverse conveyance position where the cam follower contacts the cam surface for reverse conveyance. It is to be moved.

  The present invention provides the actuator according to the invention, wherein the actuator is configured such that a plurality of screw shafts fixed to the cam in a state extending in the axial direction and a movement in the axial direction with respect to the reversing cylinder are restricted. Gears respectively engaged with a plurality of screw shafts, ring gears meshed with the plurality of gears screwed with the screw shafts, and a drive device for rotating the ring gears.

  According to the present invention, in the above invention, the selection unit that selects one of the single-sided conveyance mode and the reverse conveyance mode and the operation of the actuator are controlled, and the conveyance mode of the reverse gripper device is controlled by the selection unit. And a control device configured to have the selected transfer form.

  The present invention is the above invention, wherein the single-sided conveyance cam surface and the reverse conveyance cam surface are formed with equal displacement portions having a predetermined length in the rotation direction of the reverse cylinder when viewed from the axial direction. The time when the actuator moves the cam is a time when the cam follower is in contact with the equal displacement portion, and the movement of the cam is performed while the reversing cylinder is rotating. And

According to the present invention, when the actuator is driven, the cam is moved in the axial direction of the reversing cylinder, whereby the conveying form of the reversing gripper device is switched.
Therefore, when switching the conveyance form of the reverse gripper device to one of the conveyance form for single-sided conveyance and the conveyance form for double-sided conveyance, this switching can be easily performed, reducing the burden on the operator. It is possible to provide a sheet reversing mechanism that can be used.

It is a side view which shows the structure of the outline of a printing machine. It is a top view which shows the structure of a reversal cylinder, and the structure of a part of reversal gripper apparatus. It is sectional drawing which expands and shows a claw part. It is sectional drawing which expands and shows the connection part of an outer shaft and a 1st drive part. It is sectional drawing which expands and shows the connection part of an inner shaft and a 2nd drive part. It is a side view of the inversion cylinder seen from the 1st drive part side. It is sectional drawing which expands and shows the support part of the support member used for a 1st drive part. It is sectional drawing of the part through which the rotating shaft of an inversion cylinder penetrates a flame | frame. FIG. 8 is drawn in a state where the single-sided conveyance form is adopted. It is sectional drawing of the part through which the rotating shaft of an inversion cylinder penetrates a flame | frame. FIG. 9 is drawn in a state where the reverse conveyance mode is adopted. It is a side view which shows the shape of the cam of a 1st drive part. It is a side view which shows the shape of the cam of a 2nd drive part. It is a front view of a cam fixing mechanism, and the figure is drawn in a state in which the frame is broken. It is a side view which shows the structure of an actuator typically. It is a block diagram which shows the structure of the control system of the sheet inversion mechanism which concerns on this invention. It is a flowchart for demonstrating operation | movement of the sheet | seat inversion mechanism based on this invention. It is a figure which shows the relationship between the phase of the inversion cylinder and the angle of a 1st, 2nd nail | claw when a single-sided conveyance form is taken. It is a figure which shows the relationship between the phase of an inversion cylinder, and the angle of a 1st, 2nd nail | claw when a reverse conveyance form is taken.

  Hereinafter, an embodiment of a sheet reversing mechanism according to the present invention will be described in detail with reference to FIGS. In this embodiment, an example in which the sheet reversing mechanism according to the present invention is applied to a printing machine will be described.

  A printing machine 1 shown in FIG. 1 is a sheet-fed offset printing machine. The printing machine 1 transports a sheet 4 from a sheet supply unit 2 located at the rightmost position in FIG. 1 to a printing unit 3, and performs printing on one or both sides of the sheet 4 in the printing unit 3. The sheet 4 that has been printed in the printing unit 3 is discharged to the sheet discharge pile 6 in the sheet discharge unit 5.

The sheet supply unit 2 includes an inclined feeder board 7.
The printing unit 3 includes a first printing unit 8 located on the upstream side in the conveyance direction of the sheet 4, and a second printing unit 9 located on the downstream side in the conveyance direction of the sheet 4 from the first printing unit 8. It has.
The first printing unit 8 includes a first transfer cylinder 12 to which the sheet 4 supplied from the sheet supply unit 2 is conveyed by the swing unit 11, and a first transfer unit to which the sheet 4 is sent from the first transfer cylinder 12. An impression cylinder 13 is provided. Although not shown, the first printing unit 8 includes an ink device, a water supply device, a plate cylinder, a rubber cylinder, and the like for printing on the sheet 4 held on the first impression cylinder 13. ing.

The second printing unit 9 includes a second transfer cylinder 14 to which the printed sheet 4 is sent from the first impression cylinder 13, and a third transfer cylinder 15 to which the sheet 4 is sent from the second transfer cylinder 14. And a second impression cylinder 17 through which the sheet 4 is fed from the third transfer cylinder 15 via the reversing cylinder 16.
The sheet 4 sent from the first printing unit 8 to the second printing unit 9 is fed by the first and second transfer cylinders 14 and 15 to the reversing cylinder 16 with the surface exposed. It is done.

  The reversing cylinder 16 constitutes a part of the sheet reversing mechanism 21 according to the present invention, and is positioned between the third transfer cylinder 15 and the second impression cylinder 17 and rotates. Further, the reversing cylinder 16 is capable of switching the transport mode, as will be described in detail later. This conveyance form is two types of conveyance forms, a single-sided conveyance form and a reverse conveyance form. When the single-sided conveyance form is adopted, the sheet 4 is not reversed, and the sheet 4 is sent to the second impression cylinder 17 with the surface of the sheet 4 contacting the reversal cylinder 16. When the reverse conveyance mode is adopted, the sheet 4 is reversed, and the sheet 4 is sent to the second impression cylinder 17 with the back surface of the sheet 4 in contact with the reverse cylinder 16.

In this embodiment, the third transfer cylinder 15 constitutes an “upstream conveyance cylinder” according to the present invention, and the second impression cylinder 17 constitutes a “downstream conveyance cylinder” according to the present invention. ing.
Although not shown, the second printing unit 9 includes an ink device, a water supply device, a plate cylinder, a rubber cylinder, and the like for printing on the sheet 4 held on the second impression cylinder 17. .
The sheet discharge unit 5 conveys the sheet 4 using the delivery chain 18.

As shown in FIG. 2, the reversing drum 16 has a drum body 23 having a peripheral surface 22, and a rotating shaft 25 that protrudes from a bearer 23 a located at both ends of the drum body 23 and passes through a frame 24 (see FIG. 2). And. The inversion cylinder 16 is rotatably supported on the frame 24 via the rotation shaft 25.
A notch 26 is formed in the outer peripheral portion of the trunk body 23 so as to open from the circumferential surface 22 and extend from one end portion to the other end portion of the trunk body 23 in the axial direction. In the notch 26, a plurality of gripping claws 31 are provided in a state of being arranged at a predetermined interval in the axial direction of the reversing drum 16. These gripping claws 31 are for gripping the sheet 4 and constitute a part of a reverse gripping claw device 32 described later.

  The reversing gripper device 32 constitutes the sheet reversing mechanism 21 according to the present invention together with the reversing drum 16. The reverse gripping claw device 32 has a conveying function of receiving the sheet 4 from the third transfer cylinder 15 using a number of gripping claws 31 and transferring the sheet 4 to the second impression cylinder 17. The single-sided conveyance mode and the reverse conveyance mode described above are realized by using this conveyance function. In addition, the reversing gripper device 32 includes a first driving unit 33 located on one end side of the reversing cylinder 16 and a reversing unit in order to switch the conveying mode to one of the two types of conveying modes. And a second drive unit 34 located on the other end side of the body 16.

  As shown in FIG. 3, the holding claw 31 includes a first claw piece 35 and a second claw piece 36. The first claw piece 35 and the second claw piece 36 are each formed in a plate shape, and extend in a direction orthogonal to the axial direction of the reversing drum 16. Further, the first claw piece 35 and the second claw piece 36 are positioned on the same plane orthogonal to the axis of the reversing drum 16 so that the sheet 4 can be sandwiched between the tip portions. .

  The base end portion of the first claw piece 35 is attached to the claw holder 37 with a mounting bolt 38. The claw holder 37 includes an annular portion 39 having a circular hole 37a, and a first arm 40 and a second arm 41 protruding from the annular portion 39 in a direction opposite to the first claw piece 35. Yes. The annular portion 39 is formed with an attachment seat 42 for attaching the first claw piece 35 and an opening 43 for passing the second claw piece 36.

  As shown in FIG. 3, a cylindrical outer shaft 44 described later is rotatably supported in the circular hole 37a of the claw holder 37. That is, the first claw piece 35 is rotatably supported by the outer shaft 44 via the claw holder 37. In this embodiment, the outer shaft 44 corresponds to the “first claw shaft” in the present invention. As shown in FIG. 2, the outer shaft 44 is disposed in the notch 26 of the reversing cylinder 16 and extends from one end of the reversing cylinder 16 to the other end.

  The first arm 40 and the second arm 41 of the claw holder 37 are separated from each other at a predetermined interval in a direction in which the claw holder 37 rotates with respect to the outer shaft 44. A connecting arm 45 is disposed between the first arm 40 and the second arm 41 as shown in FIG. The connecting arm 45 is formed integrally with a connecting member 46 (see FIG. 2) fixed to the outer shaft 44. As shown in FIG. 2, the coupling member 46 is positioned at a position adjacent to one or the other of the claw holder 37 in the axial direction of the reversing drum 16.

  The connecting arm 45 protrudes from the connecting member 46 in a direction approaching the claw holder 37 in the axial direction of the reversing drum 16 and is inserted between the first arm 40 and the second arm 41. As shown in FIG. 3, a compression coil spring 47 is provided between the connecting arm 45 and the first arm 40 in a compressed state. For this reason, the connecting arm 45 is pressed against the second arm 41 by the spring force of the compression coil spring 47.

  In this embodiment, when the connecting member 46 rotates in the clockwise direction in FIG. 3 together with the outer shaft 44, the connecting arm 45 pushes the first arm 40 via the compression coil spring 47, and this first arm The claw holder 37 having 40 and the first claw piece 35 rotate clockwise. When the connecting member 46 rotates together with the outer shaft 44 in the counterclockwise direction in FIG. 3, the connecting arm 45 pushes the second arm 41, whereby the claw holder 37 and the first claw piece 35 are counterclockwise. spin. That is, the first claw piece 35 rotates in the same direction as the outer shaft 44.

  As shown in FIG. 4, one end of the outer shaft 44 is rotatably supported on the bottom wall 26a of the notch 26 via a bearer 23a. A collar 50 is fixed to one end portion of the outer shaft 44 and adjacent to the bearer 23a from the other end side in the axial direction (left side in FIG. 4). The collar 50 is for restricting movement of the outer shaft 44 in one axial direction.

  A shaft portion 51 and a male screw 52 projecting from the shaft portion 51 are formed at one end portion of the outer shaft 44. The first pinion 53 is fitted to the shaft portion 51 in a state where the first pinion 53 is located on the same axis, and is fixed by a fixing nut 54 screwed into the male screw 52. The first pinion 53 meshes with a sector gear 55 that becomes a part of the first drive unit 33 described later.

  In the outer shaft 44, four portions in the middle in the axial direction are rotatably supported by brackets 48 (see FIG. 2) provided on the bottom wall 26 a of the notch 26. In FIG. 2, the bearer 23a provided at the other end portion (the left end portion in FIG. 2) of the reversing cylinder 16 has an inner shaft 61 provided in the outer shaft 44 as shown in FIG. It is pivotably supported.

  In other words, the inner shaft 61 is provided in the outer shaft 44 so as to be rotatable with respect to the outer shaft 44 in a state where the axis of the reversing cylinder 16 and the axis is parallel. In this embodiment, the inner shaft 61 constitutes a “second claw shaft” in the present invention. Reference numeral 57 denotes a collar disposed between the other end and the bearer 23a.

  The collar 57 is fixed to the inner shaft 61, and regulates movement of the outer shaft 44 and the inner shaft 61 to the other end side (left side in FIG. 5) in cooperation with the bearer 23a. Note that the movement of the inner shaft 61 toward one end is restricted by the collar 57, the outer shaft 44, the collar 50 and the bracket 48 that are positioned at one end in the axial direction. That is, the outer shaft 44 and the inner shaft 61 are rotatably supported by the reversing cylinder 16 in a state where movement in the axial direction is restricted.

  As shown in FIG. 3, the above-described second claw piece 36 is fixed to the inner shaft 61 with fixing bolts 62. The second claw piece 36 is passed through a hole 44 a formed in the outer shaft 44 and an opening 43 formed in the claw holder 37, and is the same as the first claw piece 35 in the axial direction of the reversing drum 16. Placed in position. The holes 44a of the outer shaft 44 are respectively provided at positions corresponding to the plurality of gripping claws 31 (positions corresponding to the openings 43 of the claw holder 37).

  The tip of the first claw piece 35 and the tip of the second claw piece 36 are such that the outer shaft 44 rotates clockwise in FIG. 3 and the inner shaft 61 rotates counterclockwise in FIG. By pressing each other. At this time, the first claw piece 35 is pressed against the second claw piece 36 by the spring force of the compression coil spring 47. For this reason, although the plurality of gripping claws 31 are provided on the reversing drum 16, the sheet 4 can be gripped evenly in all the gripping claws 31.

  As shown in FIG. 5, the inner shaft 61 penetrates the bearer 23 a located at the other end of the reversing cylinder 16 and protrudes to the other in the axial direction. The second pinion 63 is fitted to the protruding portion 61a in a state where the second pinion 63 is located on the same axis. The second pinion 63 is fixed to the protruding portion 61a by a male screw 61b provided on the protruding portion 61a and a nut 64 that is screwed to the male screw 61b. The second pinion 63 meshes with a sector gear 65 that becomes a part of a second drive unit 34 (see FIG. 2) described later.

The first drive unit 33 and the second drive unit 34 described above are configured in the same manner except for the shape of a cam surface which will be described later. Therefore, in the following, the configuration of the first drive unit 33 will be described with reference to the drawings, and only the configuration different from the first drive unit 33 will be described with respect to the configuration of the second drive unit 34. In addition, when explaining the member of the 2nd drive part 34, in order to distinguish with the member of the 1st drive part 33, it attaches to the code | symbol which shows the member of the 1st drive part 34, and is performed.
The members constituting the first drive unit 33 can be divided into members supported by the reversing drum 16 and members supported by the frame 24. As shown in FIG. 6, the members supported by the reversing cylinder 16 are a support member 71 having a sector gear 55 that meshes with the first pinion 53, and a cam follower 72 provided on the support member 71.

  As shown in FIG. 2, the support member 71 is an end portion in the axial direction of the reversing cylinder 16, and is positioned at a position facing the frame 24 that supports this end portion. As shown in FIG. 6, the support member 71 is formed in an annular shape surrounding the rotating shaft 25 of the reversing cylinder 16 when viewed from the axial direction of the reversing cylinder 16, and is swingable to the reversing cylinder 16 via the support shaft 73. It is supported by. The support shaft 73 is positioned on the opposite side of the sector gear 55 across the axis of the reversing cylinder 16 and is fixed to the support member 71.

Further, as shown in FIG. 7, the support shaft 73 passes through the bearer 23a of the reversing drum 16, and is rotatably supported by the bearer 23a. A support shaft 73 of the first drive unit 33 and a support shaft 73A (not shown) of the second drive unit 34 are respectively arranged in directions in which the cam fores 72 and 72A approach the rotary shaft 25, that is, cams 76 and 76A described later. The cam surfaces 74, 75, 74A, and 75A are biased in the direction of pressing.
The cam follower 72 is configured by a roller rotatably supported by the support member 71, and is provided on one side of the support member 71. The axis of the cam follower 72 is parallel to the axis of the inversion cylinder 16.

As shown in FIG. 8, the member supported by the frame 24 in the first drive unit 33 includes a cam 76 having two cam surfaces 74 and 75 with which the cam follower 72 contacts, and is fixed to the cam 76. This is an actuator 78 having a screw shaft 77.
A cylindrical sleeve 81 (see FIG. 8) that rotatably supports the rotating shaft 25 of the reversing cylinder 16 is attached to the frame 24. The sleeve 81 is fixed to the frame 24 by fixing bolts 82 so as to penetrate the frame 24 in the axial direction of the reversing cylinder 16. The rotary shaft 25 is rotatably supported on the inner peripheral portion of the sleeve 81.

  A part of the sleeve 81 protrudes inside the frame 24, that is, in a direction approaching the inversion cylinder 16 from the frame 24. The protruding portion 81a extends from the cam follower 72 toward the reversing body 16 in the axial direction. The cam 76 is formed in an annular plate shape surrounding the sleeve 81, and is fitted to the protruding portion 81 a of the sleeve 81 so as to be movable in the axial direction. The cam 76 is moved to one or the other in the axial direction by driving by an actuator 78 described later.

  The cam 76 includes a main body portion 76a having cam surfaces 74 and 75, and a plate-like portion 76b projecting outward from the main body portion 76a in the radial direction. The two cam surfaces 74 and 75 are formed using the outer end surface (outer peripheral surface) in the radial direction of the main body portion 76a. These cam surfaces 74 and 75 are provided side by side in the axial direction. Each cam surface 74, 75 extends in the rotational direction of the reversing cylinder 16 in a state of being directed to the outside in the radial direction of the reversing cylinder 16.

  Of these cam surfaces 74 and 75, one cam surface 74 located close to the reversing cylinder 16 is a single-sided conveyance cam surface used when the above-described single-sided conveyance mode is adopted. Hereinafter, this single-sided conveying cam surface is simply referred to as a single-sided cam surface 74. The other cam surface 75 is a reverse conveyance cam surface used when the above-described reverse conveyance mode is adopted. Hereinafter, this reverse conveyance cam surface is simply referred to as a reverse cam surface 75.

  As shown in FIG. 2, the one-side cam surface 74A of the second drive unit 34 is provided at a position closer to the frame 24 than the reversing cam surface 75A. The cam follower 72 is pressed against one of these cam surfaces 74 and 75. In addition, the cam follower 72 rotates integrally with the reversing cylinder 16 while rotating in contact with the cam surfaces 74 and 75 when the reversing cylinder 16 rotates while being in contact with the cam surfaces 74 and 75.

The single-sided cam surface 74 and the reverse cam surface 75 of the first drive unit 33 are formed in the shape shown in FIG. 10 when viewed from the axial direction. FIG. 10 is drawn with the cam 76 viewed from the frame 24 side in the direction toward the reversal cylinder 16. The single-sided cam surface 74 has a large displacement portion 74 a that is largely displaced inward in the radial direction of the reversing cylinder 16 as compared with the reversing cam surface 75.
The support member 71 and the cam follower 72 shown in FIG. 10 rotate counterclockwise together with the reversing cylinder 16 in the same figure.

When the cam follower 72 shown in FIG. 10 moves inward in the radial direction of the reversing cylinder 16, the sector gear 55 rotates clockwise about the support shaft 73, and the first pinion 53 meshed with the sector gear 55, Members such as the outer shaft 44, the claw holder 37, and the first claw piece 35 rotate counterclockwise with respect to the axis of the outer shaft 44.
On the single-sided cam surface 74 and the reverse cam surface 75, an equal displacement portion 83 that coincides with each other when viewed in the axial direction is formed in a rotational direction of the reverse cylinder 16 by a predetermined length. An actuator 78 described later moves the cam 76 in the axial direction when the cam follower 72 is in contact with the equal displacement portion 83. In the first drive unit 33, the cam follower 72 contacts the reversing cam surface 75 as shown in FIG. Further, as the cam 76 moves away from the reversing cylinder 16, the cam follower 72 contacts the one-sided cam surface 74 as shown in FIG.

  The cam 76A of the second drive unit 34 is formed in the shape shown in FIG. 11 when viewed from the axial direction. FIG. 11 is drawn with the cam 76A viewed from the frame 24 side. One-sided cam surface 74A of the cam 76A has a large displacement portion 74Aa that is largely displaced radially outward of the reversing cylinder 16 as compared with the reversing cam surface 75A. The support member 71A and the cam follower 72A shown in FIG. 11 rotate in the clockwise direction together with the reversing cylinder 16 in the figure. When the cam follower 72A shown in FIG. 11 moves outward in the radial direction of the reversing cylinder 16, the sector gear 65 rotates clockwise around the support shaft 73A, and the second pinion 63 meshes with the sector gear 65; Members such as the inner shaft 61 and the second claw piece 36 rotate clockwise with respect to the axis of the inner shaft 61.

  An equal displacement portion 83 is also provided on the one-side cam surface 74A and the reverse cam surface 75A shown in FIG. In the second drive unit 34, the cam follower 72A contacts the single-sided cam surface 74A as the cam 76A moves in a direction approaching the reversing cylinder 16. Further, the cam follower 72A comes into contact with the reverse cam surface 75A when the cam 76A moves in a direction away from the reverse cylinder 16.

The cam 76 must be fixed so as not to move to the frame 24 during operation of the printing press 1. In order to realize this, the first drive unit 33 and the second drive unit 34 include a cam fixing mechanism 91 (see FIG. 12).
As shown in FIG. 12, the cam fixing mechanism 91 includes a braking member 92 that faces the radial edge of the cam 76, and is configured to press the braking member 92 against the cam 76 to fix the cam 76. is there. A portion of the cam 76 facing the braking member 92 is constituted by a plate 76c (see FIG. 10) attached to the plate-like portion 76b of the cam 76.

  The braking member 92 is supported by the frame 24 so as to be movable in a direction orthogonal to the axial direction in a state where movement of the reversing cylinder 16 in the axial direction is restricted. An end surface of the braking member 92 opposite to the cam 76 is formed as an inclined surface 93. The inclined surface 93 is formed by a flat flat surface, and gradually inclines away from the cam 76 as the distance from the reversing cylinder 16 increases in the axial direction of the reversing cylinder 16. A pressing member 94 is in contact with the inclined surface 93.

  The pressing member 94 is formed with an inclined surface 95 parallel to the inclined surface 93 of the braking member 92. The inclined surface 95 is formed by a flat flat surface. The end of the pressing member 94 opposite to the braking member 92 is in contact with a stopper 96 fixed to the frame 24. The stopper 96 is for restricting the movement of the pressing member 94 in the direction away from the cam 76. The contact portion between the stopper 96 and the pressing member 94 is formed by a flat surface parallel to the axial direction of the reversing cylinder 16 that does not restrict movement of the pressing member 94 in the axial direction.

  The above-described inclined surface 93 of the braking member 92 and the inclined surface 95 of the pressing member 94 constitute an inclined portion 97 that converts movement of the pressing member 94 in the axial direction into movement in a direction orthogonal to the axial direction. ing. In this embodiment, the pressing member 94 is biased in one axial direction away from the reversing cylinder 16, whereby the braking member 92 is pressed against the cam 76 by the wedge action of the inclined portion 97, and a braking force is generated. The cam 76 is locked.

  The pressing member 94 is supported by an urging portion 98 described later in a state where the inclined surface 95 overlaps the inclined surface 93 of the braking member 92. The urging portion 98 has a function of urging the pressing member 94 to one side in the axial direction that is the moving direction of the pressing member 94 when the braking member 92 is pressed against the cam 76 by the wedge action of the inclined portion 97. . The urging portion 98 according to this embodiment includes a supporting bolt 99 extending in the axial direction of the reversing cylinder 16 and penetrating the pressing member 94 and the frame 24, and a plurality of annular shapes housed in the recesses 100 of the frame 24. A disc spring 101 is provided. The pressing member 94 is fixed to one end of the support bolt 99 in a state where the support bolt 99 passes therethrough.

The support bolt 99 is supported by the frame 24 so as to be movable in the axial direction while passing through the recess 100 of the frame 24. The intermediate portion of the support bolt 99 passes through a plurality of disc springs 101 and a spring receiving member 102 located on the other end side of the disc springs 101. The spring receiving member 102 is accommodated in the recess 100 of the frame 24.
Two nuts 103 and 103 and a pressure receiving member 104 are screwed to the other end of the support bolt 99. The two nuts 103, 103 restrict the movement of the spring receiving member 102 pressed by the disc spring 101.

The plurality of disc springs 101 described above are inserted in a compressed state between the spring receiving member 102 and the bottom surface of the recess 100. For this reason, the supporting bolt 99 and the pressing member 94 are biased in one axial direction (direction away from the reversing cylinder 16) by the spring force of these disc springs 101.
A roller 106 of a lock release unit 105 (described later) is in contact with the tip of the pressure receiving member 104 attached to the other end of the support bolt 99.

The unlocking part 105 is for moving the pressing member 94 to the other in the axial direction. The lock release unit 105 according to this embodiment includes a lever 107 having the roller 106 described above and an air cylinder 108 that selectively pushes the swinging end of the lever 107 to the other in the axial direction.
The lever 107 is swingably supported on the frame 24 via a support bracket 109 and a support shaft 110. The support shaft 110 is supported by the support bracket 109 with the direction orthogonal to the axial direction of the reversing cylinder 16 as the axial direction. That is, the lever 107 is supported by the frame 24 so as to be swingable in the axial direction of the reversing cylinder 16. The roller 106 described above is rotatably supported by a middle portion of the lever 107 via a first shaft member 111 parallel to the support shaft 110.

  The lever 107 according to this embodiment is formed by two rod-shaped lever bodies 107a and 107b. These lever bodies 107a and 107b are arranged in the axial direction of the support shaft 110, and are coupled by a plurality of bolts. The plurality of bolts includes a first bolt 112 provided at both ends of the support shaft 110, a second bolt 113 provided at both ends of the first shaft member 111, and the second bolt 113. These are two third bolts 114 and 114 positioned on the swing end portion side of the lever 107.

  The third bolt 114 is for attaching the spacer 115 between the lever main bodies 107a and 107b. A bolt 116 protruding toward the frame 24 is screwed to the spacer 115 so that the position in the longitudinal direction can be changed. A rod-shaped stopper 117 is provided at a position facing the bolt 116 in the frame 24. The stopper 117 restricts the swing of the lever 107 toward the frame 24 when the tip of the bolt 116 comes into contact with one end face thereof.

  A connecting member 119 is rotatably supported at the swinging end portion of the lever 107 via a second shaft member 118 parallel to the support shaft 110. A piston rod 108 a of an air cylinder 108 is attached to the connecting member 119. The air cylinder 108 is connected to a pressurized air supply source (not shown) via an air cylinder control valve 120 (see FIG. 14). As the air cylinder control valve 120, a valve that switches between a mode in which pressurized air is supplied to the air cylinder 108 and a mode in which air is discharged from the air cylinder 108 can be used.

By supplying pressurized air from the air cylinder control valve 120 to the air cylinder 108, the piston rod 108a protrudes from the cylinder body 108b. The piston rod 108a returns to the initial position when the supply of pressurized air to the air cylinder 108 is cut off and air is discharged from the air cylinder 108.
In the lock release portion 105, the air cylinder 108 pushes the swing end portion of the lever 107 toward the frame 24, so that the roller 106 pushes the support bolt 99 to the other in the axial direction via the pressure receiving member 104. When the supporting bolt 99 is pressed in this manner, the braking force due to the wedge action of the inclined portion 97 disappears, and the cam 76 is unlocked. An actuator 78, which will be described later, drives the cam 76 in a state where the braking force disappears in this way.

The actuator 78 has a structure that drives a screw shaft 77 (see FIGS. 8 to 11) provided on the cam 76 in the axial direction by the action of a screw. As shown in FIG. 13, the actuator 78 according to this embodiment includes a thrust generator 121 for generating a thrust in the axial direction and a drive unit 122 that drives the thrust generator 121.
The thrust generating unit 121 generates thrust in the axial direction by using the three screw shafts 77 simultaneously. As shown in FIG. 10, the screw shaft 77 is provided at a position that divides the plate-like portion 76 b of the cam 76 into three equal parts in the rotation direction of the reversing cylinder 16. These screw shafts 77 penetrate the frame 24 in the axial direction as shown in FIG. Further, these screw shafts 77 are movable with respect to the frame 24.

  As shown in FIG. 8, a male screw 77 a is formed at the tip of the screw shaft 77. A gear 123 is screwed into the male screw 77a of each screw shaft 77. A stopper 124 is rotatably fitted to one end of these gears 1123. The stopper 124 is for restricting the movement of the gear 123 in the direction away from the frame 24, and is fixed to the frame 24 by a fixing bolt 125.

  As shown in FIG. 13, one ring gear 126 meshes with the three gears 123. As shown in FIG. 8, the ring gear 126 is rotatably supported by the sleeve 81 in a state where movement in the axial direction is restricted. The thrust generating part 121 of the actuator 78 is constituted by three gears 123, a stopper 124, and a ring gear 126.

  The drive unit 122 of the actuator 78 rotates the ring gear 126. The drive unit 122 corresponds to the “drive device” in the second aspect of the invention. As shown in FIG. 13, the drive unit 122 includes a first gear 127 that meshes with the ring gear 126, a second gear 128 that meshes with the first gear 127, and a coaxial shape with the second gear 128. And a motor 131 for rotating the worm 130 meshed with the worm wheel 129. The first gear 127 and the second gear 128 are provided at positions along the frame 24 as shown in FIG. The worm wheel 129, the worm 130, and the motor 131 are disposed at positions separated from the frame 24 on the side opposite to the reversing body 16, and are supported by the frame 24 via a bracket (not shown).

The operation of the motor 131 is controlled by a control device 141 (see FIG. 14) described later.
As shown in FIG. 14, the control device 141 includes a phase detection unit 142, a motor control unit 143, and an air cylinder control unit 144. Further, the control device 141 includes a phase detector 145, an encoder 146, a single-side / double-side selection switch 147, an air cylinder control valve 120, an actuator motor 131, a main unit motor 148, a cam changeover switch 149, and the like. Is connected.

The phase detector 145 is for detecting the rotational phase of the reversing cylinder 16 of the printing press 1.
The encoder 146 is provided in the motor 131 of the actuator 78 and detects the rotational phase of the motor 131.
The single side / double side selection switch 147 is operated when the operator switches the driving mode. In this embodiment, the single-side / double-side selection switch 147 constitutes a “selection unit” according to the third aspect of the present invention.
The air cylinder control valve 120 is for controlling the operation of the air cylinder 108 of the cam fixing mechanism 91.
The machine motor 148 drives the first and second impression cylinders 13 and 17 and the first to third transfer cylinders 12, 14 and 15 including the reversing cylinder 16 of the printing machine 1.
The cam changeover switch 149 is operated by an operator (not shown) when the operation mode of the sheet reversing mechanism 21 is changed.

The phase detector 142 of the control device 141 detects the current rotational phase of the inversion cylinder 16 based on the detection signal sent from the phase detector 145.
The motor control unit 143 has three functions. The first function is a function of detecting the position of the cam 76 in the axial direction based on a detection signal sent from the encoder 146 provided in the motor 131 of the actuator 78. The second function is a function of operating the motor 131 of the actuator 78 until the position of the cam 76 reaches the target position. The target position of the cam 76 is a position at which the conveyance mode selected by the single side / double side selection switch 147 is realized. The third function is a function for rotating the motor 148 at a predetermined rotational speed when the cam 76 is moved.

  The air cylinder control unit 144 sends an air supply control signal to the air cylinder control valve 120 immediately before the cam 76 moves. By sending a control signal for air supply to the air cylinder control valve 120, pressurized air is supplied to the air cylinder 108. Further, the air cylinder control unit 144 sends an air shutoff control signal to the air cylinder control valve 120 after the movement of the cam 76 is completed. By sending an air shutoff control signal to the air cylinder control valve 120, the supply of pressurized air to the air cylinder 108 is shut off, and the air in the air cylinder 108 is discharged.

Next, the operation of the sheet reversing mechanism 21 will be described using the flowchart of FIG. 15, including the description of the further configuration of the control device 141 described above.
The operation of switching the operation mode of the sheet reversing mechanism 21 is performed in a state where printing by the printing machine 1 is not performed. The operation of switching the operation mode is started when the operator turns on the cam changeover switch 149 as shown in step S1 of the flowchart shown in FIG. After the cam changeover switch 149 is turned on, the control device 141 sets the operation mode selected by the single-side / double-side selection switch 147 as the target operation mode in step S2. At this time, the control device 141 compares the current position of the cam 76 with the target position of the cam 76 where the target operation mode is realized, and the rotation direction of the motor 131 of the actuator 78 and the target rotation amount are determined. Is set.

  Thereafter, in step S <b> 3, the control device 141 detects the phase of the inversion cylinder 16. In step S4, the control device 141 determines whether or not the phase of the reversing cylinder 16 is a switching phase. The switching phase is a phase in which the cam follower 72 contacts the equal displacement portion 83 of the cam 76. At this time, when the cam follower 72 is in contact with the equal displacement portion 83 of the cam 76, the process proceeds to step S5 described later. On the other hand, when the cam follower 72 is not in contact with the equal displacement portion 83 of the cam 76, the control device 141 executes step S6 to rotate the machine motor 148 and then executes step S3 again.

When the main unit motor 148 is rotated in step S6, the control device 141 stops the main unit motor 148 when the phase of the reversing cylinder 16 reaches the switching phase (step S5).
In step S <b> 7, the control device 141 sends a control signal for air supply to the air cylinder control valve 120, thereby eliminating the braking force by the cam fixing mechanism 91 and releasing the lock of the cam 76. Next, in step S8, the control device 141 rotates the machine motor 148 at a predetermined rotational speed. Thereafter, in step S9, the control device 141 rotates the motor 131 of the actuator 78 by the target rotation amount in the target rotation direction.

At this time, when the operation mode selected by the single-side / double-side selection switch 147 is the single-sided conveyance mode, the single-sided cam surface 74 of the cams 76 and 76A in both the first drive unit 33 and the second drive unit 34. , 74A are positioned at positions where they come into contact with the cam followers 72, 72A.
On the other hand, when the operation mode selected by the single-side / double-side selection switch 147 is the reverse conveyance mode, the reverse cam surfaces 75, 76A of the cams 76, 76A in both the first drive unit 33 and the second drive unit 34. The cams 76 and 76A are positioned at positions where 75A contacts the cam followers 72 and 72A. In other words, the actuator 78 includes the cams 76, 76A between a position where the cam followers 72, 72A are in contact with the single-sided conveyance cam surfaces 74, 74A and a position where the cam followers 72, 72A are in contact with the reverse conveyance cam surfaces 75, 75A. Move.

When the cam 76 moves in this manner, the cam motor 72 is rotated by the cam 76 because the motor 148 is rotating. Therefore, the cam 76 moves in the axial direction while the cam follower 72 is pressed against the cam surfaces 74 and 75 and is rolling on the cam surface.
After the motor 131 of the actuator 78 has rotated by the target rotation amount, the control device 141 stops the motor 131 in step S10, and stops the main motor 148 in step S11.
Thereafter, in step S <b> 12, the control device 141 sends an air shutoff control signal to the air cylinder control valve 120, and the cam 76 is fixed by the cam fixing mechanism 91. When the cam 76 is thus fixed, the operation mode switching operation is completed.

The angle of the first claw piece 35 and the second claw piece 36 with respect to the reversal cylinder 16 when the sheet reversing mechanism 21 according to this embodiment adopts the single-sided conveyance form changes as shown in FIG. In FIG. 16, a first claw piece 35 and a second claw piece 36 are respectively drawn at a plurality of positions A to I in the rotation direction of the reversing cylinder 16. The position A is the position of the first claw piece 35 and the second claw piece 36 when the sheet 4 is passed from the reversing cylinder 16 to the second impression cylinder 17. Positions B to I are positions of the first claw piece 35 and the second claw piece 36 in each phase during one rotation of the reversing cylinder 16.
In FIG. 16, what is indicated by reference numeral 151 provided in the third transfer cylinder 15 and the second impression cylinder 17 is a gripping claw device that holds an upstream end in the conveyance direction of the sheet 4.

  As can be seen from FIG. 16, when the sheet 4 is received from the third transfer cylinder 15, the position between the first claw piece 35 and the second claw piece 36 is increased at the position F after the distance between the first claw piece 35 and the second claw piece 36 is increased. The interval is zero. Thereafter, the interval between the first claw piece 35 and the second claw piece 36 is kept at 0 until the sheet 4 is transferred to the second impression cylinder 17.

That is, in the single-sided conveyance mode, the first claw piece 35 is a sheet from the reversing cylinder 16 to the second impression cylinder 17 when the cam follower 72 of the first driving unit 33 passes through a high part of the single-sided cam surface 74. 4 is positioned to pass. Further, the second claw piece 36 is located at a position where the sheet 4 is passed from the reversing cylinder 16 to the second impression cylinder 17 when the cam follower 72A of the second drive unit 34 passes through a low part of the one-side cam surface 74A. Positioned.
In the single-sided conveyance mode, the sheet 4 is conveyed by the reversing cylinder 16 in a state where the surface is in contact with the reversing cylinder 16, and is transferred to the second impression cylinder 17 by the second impression cylinder 17 in a state where the surface is exposed. Be transported.

  The angle of the first claw piece 35 and the second claw piece 36 with respect to the reversal cylinder 16 when the sheet reversing mechanism 21 adopts the reversal conveyance form changes as shown in FIG. In FIG. 17, a first claw piece 35 and a second claw piece 36 are drawn at positions corresponding to positions A to I shown in FIG. In FIG. 17, what is indicated by reference numeral 152 provided on the third transfer cylinder 15 is an adsorbing device that adsorbs the downstream end in the conveyance direction of the sheet 4.

  As can be seen from FIG. 17, the first claw piece 35 and the second claw piece 36 move in the middle of the position A from the position E to the front in the rotational direction from the position pointing to the rear in the rotational direction of the reversing cylinder 16. It rotates with respect to the reversing cylinder 16 to the position where it points. The distance between the first claw piece 35 and the second claw piece 36 gradually increases until the position D is reached, and becomes 0 when the position F is reached. That is, in the reverse conveyance mode, the first claw piece 35 and the second claw piece 36 hold the downstream end in the conveyance direction of the sheet 4.

  In the reverse conveyance mode, the first claw piece 35 is positioned at a position where the sheet 4 is received from the third transfer cylinder 15 when the cam follower 72 of the first drive unit 33 passes through a lower portion of the reverse cam surface 75. It is done. Further, the second claw piece 36 is positioned at a position for receiving the sheet 4 from the third transfer cylinder 15 when the cam follower 72A of the second drive unit 34 passes through a high portion of the reverse cam surface 75A.

  The first claw piece 35 and the second claw piece 36 hold the downstream end in the conveying direction of the sheet 4 at the position E and then move to the position A while holding the sheet 4 with respect to the reversing cylinder 16. Turn in the opposite direction. For this reason, in the reverse conveyance mode, the sheet 4 is conveyed by the reversal cylinder 16 with the back surface in contact with the reversal cylinder 16, passed to the second impression cylinder 17, and then exposed to the second pressure. It is conveyed by the cylinder 17.

In the sheet reversing mechanism 21 configured as described above, the conveyance form of the reversing gripper claw device 32 is switched by the cams 76 and 76A moving in the axial direction of the reversing cylinder 16 by driving the actuators 78 and 78A.
Therefore, according to this embodiment, when switching the conveyance form of the reverse gripper claw device 32 to one of the conveyance form for single-sided conveyance and the conveyance form for double-sided conveyance, this switching is easily performed. Therefore, it is possible to provide a sheet reversing mechanism that can reduce the burden on the operator.

The actuator 78 according to this embodiment meshes with the plurality of screw shafts 77 fixed to the cam 76 in a state extending in the axial direction, the gears 123 respectively engaged with the plurality of screw shafts 77, and the gears 123. A ring gear 126 and a drive unit 122 that rotates the ring gear 126 are provided.
According to this embodiment, when the ring gear 126 is rotated by the drive of the drive unit 122, the gear 123 that is screwed to the screw shaft 77 is rotated, and the screw shaft 77 is moved in the axial direction by the action of the screw. For this reason, the cam 76 having an annular plate shape is evenly pushed in the axial direction of the reversing drum 16 at a plurality of portions in the circumferential direction.
Accordingly, the cam 76 moves without being tilted and twisted in the axial direction while keeping the accuracy of the positions of the cam surfaces 74 and 75 high. Therefore, the first claw piece 35 is used in any of the two transport modes. It is possible to provide a sheet reversing mechanism in which the second claw piece 36 operates with high accuracy.

The sheet reversing mechanism 21 according to this embodiment includes a single-side / double-side selection switch 147 (selection unit) for selecting one of the single-sided conveyance form and the reverse-conveyance form. In addition, the sheet reversing mechanism 21 includes a control device 141 that controls the operation of the actuator 78 and sets the conveying mode of the reversing gripper claw device 32 to the conveying mode selected by the single-side / double-sided selection switch 147.
For this reason, according to this embodiment, when the operator selects one of the two types of transport modes with the single-side / double-side selection switch 147, the transport mode of the reverse gripper device 32 is automatically changed.
Therefore, according to this embodiment, it is possible to provide a sheet reversing mechanism that can more easily switch the conveyance mode.

An equal displacement portion 83 that coincides with each other when viewed in the axial direction is formed on the single-sided conveyance cam surface 74 and the reverse conveyance cam surface 75 according to this embodiment by a predetermined length in the rotation direction of the reverse cylinder 16. . The time when the actuator 78 moves the cam 76 is the time when the cam follower 72 is in contact with the equal displacement portion 83. The cam 76 is moved in a state where the reversing cylinder 16 is rotating (a state where the cam follower 72 is rotating with respect to the cam 76).
Therefore, when the cam 76 moves in the axial direction while the cam follower 72 is in contact with the cam follower 72, the cam follower 72 is hardly rubbed against the cam 76, and wear is reduced at the contact portion between the cam 76 and the cam follower 72. As a result, even when used for a long time, the force when the first claw piece 35 and the second claw piece 36 hold the sheet 4 hardly changes, and the sheet reversal that can convey the sheet 4 with high registration accuracy. A mechanism can be provided.

  The embodiment described above has shown an example in which the present invention is applied to the sheet-fed offset printing press 1. However, the present invention is not limited to such a limitation. The sheet reversing mechanism 21 according to the present invention is any apparatus that uses a conveyance cylinder to convey a sheet and reverses the sheet during conveyance to process both sides of the sheet. Can be applied. Examples of this type of processing apparatus include a liquid transfer apparatus, a foil transfer apparatus, a surface processing apparatus, and a processing apparatus that processes a sheet. The liquid transfer apparatus transfers a liquid such as a coating liquid onto a sheet. The foil transfer device transfers the foil to a sheet. The surface treatment apparatus includes a device that presses a film on a liquid transferred to a sheet to smooth the transfer surface, and a device that applies a specific pattern to the transfer surface. Processing apparatuses that process a sheet include an apparatus that performs an embossing process on a sheet and an apparatus that creases a sheet. By applying the present invention to these apparatuses, it is possible to perform the processing by the processing apparatus on both sides of the sheet in one pass.

  DESCRIPTION OF SYMBOLS 1 ... Printing machine, 15 ... 3rd transfer cylinder (upstream conveyance cylinder), 16 ... Reversing cylinder, 17 ... 2nd impression cylinder (downstream conveyance cylinder), 21 ... Sheet reversing mechanism, 24 ... Frame, 31 ... Mouth claw, 32 ... Inverted claw device, 33 ... First drive unit, 34 ... Second drive unit, 35 ... First claw piece, 36 ... Second claw piece, 44 ... Outer shaft (first shaft) (Claw shaft), 53 ... first pinion, 55, 65 ... sector gear, 61 ... inner shaft (second claw shaft), 63 ... second pinion, 71, 71A ... support member, 72, 72A ... cam follower, 74, 74A ... single-sided transfer cam surface, 75, 75A ... reverse transfer cam surface, 76, 76A ... cam, 77 ... screw shaft, 78 ... actuator, 83 ... equal displacement part, 122 ... drive part (drive device), 123 ... Gear, 126 ... Ring gear, 141 ... Control device, 147 ... Single side / Double side selection switch (Selection unit).

Claims (4)

A reversing cylinder positioned and rotated between an upstream conveyance cylinder and a downstream conveyance cylinder for sheet conveyance;
Two types of conveyance modes that have a conveyance function of receiving a sheet from the upstream conveyance cylinder using a gripping claw provided on the reversing cylinder and passing the sheet to the downstream conveyance cylinder, and realizing this conveyance function And a reversing gripper device that can be switched to one of the transport modes,
The two types of transport modes are:
A single-sided conveyance form that passes the sheet received from the upstream conveyance cylinder to the downstream conveyance cylinder without inverting it,
It is a reverse conveyance form that reverses the sheet received from the upstream conveyance cylinder and passes it to the downstream conveyance cylinder,
The reversing gripper device is
A cylindrical first claw shaft rotatably supported by the reversing drum in a state where the reversing drum and the axis are parallel to each other;
A plurality of first claws provided on the first claw shaft in a state of being arranged at intervals in the axial direction of the first claw shaft;
A first pinion provided at one end of the first claw shaft in the axial direction;
A first drive unit having a sector gear meshing with the first pinion;
A second claw shaft provided in the first claw shaft so as to be rotatable with respect to the first claw shaft in a state where the axis of the inversion cylinder and the axis are parallel to each other;
A plurality of second claws provided on the second claw shaft in a state of being arranged at intervals in the axial direction of the second claw shaft;
A second pinion provided at the other end of the second claw shaft in the axial direction;
A second drive unit having a sector gear meshing with the second pinion,
The first drive unit and the second drive unit are:
An end portion in the axial direction of the reversing cylinder, and supported at a position facing the frame that rotatably supports the end portion of the reversing cylinder so as to be swingable about an axis parallel to the axis of the reversing cylinder. A supporting member;
A cam having a cam surface supported by the frame so as to be movable in the axial direction and extending in the rotation direction of the reversing cylinder in a state of being directed to the outside in the radial direction of the reversing cylinder;
The sector gear provided on the support member;
A cam follower provided on the support member and in contact with the cam surface of the cam;
An actuator for moving the cam in the axial direction,
The cam surface of the cam consists of a single-sided conveyance cam surface used when the single-sided conveyance mode is adopted, and a reverse conveyance cam surface used when the reverse-conversion conveyance type is adopted,
The single-sided conveyance cam surface and the reverse conveyance cam surface are provided side by side in the axial direction,
The actuator moves the cam in the axial direction between a single-sided conveyance position where the cam follower contacts the cam surface for single-sided conveyance and a reverse conveyance position where the cam follower contacts the cam surface for reverse conveyance. Is a sheet reversing mechanism. In the sheet reversing mechanism according to claim 1,
The actuator is
A plurality of screw shafts fixed to the cam in a state extending in the axial direction;
Gears respectively screwed into the plurality of screw shafts in a state in which movement in the axial direction is restricted with respect to the reversing cylinder;
A ring gear meshed with the plurality of gears threadedly engaged with the screw shaft;
And a driving device for rotating the ring gear. In the sheet reversing mechanism according to claim 1 or 2,
A selection unit in which one of the one-sided conveyance form and the reverse conveyance form is selected;
A sheet reversing mechanism, further comprising: a control device that controls the operation of the actuator so that the conveying form of the reversing gripper device is selected by the selecting unit. In the sheet reversing mechanism according to any one of claims 1 to 3,
The single-side transfer cam surface and the reverse transfer cam surface are formed with equal displacement portions corresponding to each other when viewed in the axial direction by a predetermined length in the rotation direction of the reverse cylinder,
The time when the actuator moves the cam is a time when the cam follower is in contact with the equal displacement portion, and the movement of the cam is performed while the reversing cylinder is rotating. Sheet reversing mechanism.

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