JP2009154481A - Reversing device for sheet printing machine, and sheet printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reversing device for a sheet printing machine and a sheet printing machine that can improve the accuracy of sheet reversing. <P>SOLUTION: A reversing cylinder 38 has on an outer circumference a gripper 51 having a front finger 58 and a back finger 60 for gripping a trailing end of a printing sheet S. The gripper 51 can be turned on finger shafts 54 and 55 by a finger drive 52 to reverse the printing sheet S. The finger drive 52 includes a first link mechanism 61 capable of turning a cam input shaft 65 as a cam follower 64 is actuated by a rotary cam 63, and a second link mechanism 62 capable of turning the gripper 51 as the cam input shaft 65 is turned. The second link mechanism 62 includes at least four coupling links 74, 76, 78 and 79 for coupling the cam input shaft 65 to the finger shafts 54 and 55, and a guide mechanism 81 for guiding a coupling shaft 77 for one of the coupling links 74, 76, 78 and 79. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reversing device for reversing the front and back of a sheet when printing on both sides of the sheet in a sheet-fed printing press, and a sheet-fed printing press having the reversing device.

  The offset sheet-fed printing press includes a paper feeding device (paper feeding unit), a sheet conveying device (sheet conveying unit), a printing device (printing unit), and a paper discharging device (paper discharging unit). In the double-sided printing machine, a reversing device is provided in the printing apparatus. Therefore, when performing single-sided printing, the sheets stacked on the sheet feeding table are sucked by the sheet feeding device, sent forward, and conveyed to the printing device by the sheet conveying device, where predetermined printing is performed. After that, the paper is stacked on the paper discharge tray by the paper discharge device and discharged. In addition, when performing duplex printing, the sheets stacked on the sheet feeding table are sucked by the sheet feeding device, sent forward, and conveyed to the printing device by the sheet conveying device, where predetermined printing is performed on the surface. After being applied, the sheet is turned upside down by the reversing device, predetermined printing is performed on the back surface, and then the sheets are stacked on the paper receiving tray by the paper discharging device and discharged.

  When performing single-sided printing with the reversing device in this offset sheet-fed printing press, the claw member provided on the outer periphery of the reversing cylinder holds the front end of the sheet conveyed by the upstream paper conveying cylinder, and remains as it is. Then, the end of the sheet gripped by the claw member is transferred to the next impression cylinder as the front end. On the other hand, when performing double-sided printing, the nail member holds the rear end of the sheet conveyed by the upstream paper conveyance cylinder, and the nail member reverses in the middle of conveying the sheet as the reversing cylinder rotates, and the nail The end of the sheet that the member holds is transferred to the next impression cylinder as the front end.

  In this case, the claw member is composed of a front claw and a back claw, and the front claw and the back claw are fixed to each claw shaft supported by the reversing drum, and each claw shaft is rotated by a driving device. Then, the front and back claws can be rotated to grip and release the sheet. That is, in double-sided printing, the back nail grips the back end of the sheet and rotates so that the back nail and the front nail approach each other as the reversing cylinder rotates, and the sheet nipped by the back nail becomes the front nail. The sheet is conveyed, and the end of the sheet gripped by the front nail is conveyed as the front end. In this case, the driving device that opens and closes the front and back claws is generally constituted by a link mechanism, a sector gear mechanism, or the like.

  As a reversing device in an offset sheet-fed printing press, for example, there is one described in Patent Document 1 below. In the reversing device described in Patent Document 1, in the first embodiment, the claw turning device is configured by five levers and links having a cam follower, and in the second embodiment, the claw turning device is provided with three cam followers. A sector gear is added to the lever and link. Further, in the reversing device described in Patent Document 2 below, the claw shaft mounted on the reversing drum is configured in a coaxial double structure, and the inner claw shaft and the outer claw shaft are connected to a driving mechanism that individually rotates and drives the claw shaft. The front nail is attached to the outer nail shaft, the back nail is attached to the inner nail shaft, the sheet is held by the front nail and the back nail, and the sheet can be reversed.

Japanese Patent Laid-Open No. 08-156228 JP 2006-289631 A

  In the above-described conventional reversing device (Patent Document 1), the reversing body is provided with front claws (front claw shaft) and back claws (back claw shaft), and the sheet gripped by the back claws is transferred to the front claws. If the opening and closing timings of the front and back claws are shifted, there is a risk that the sheet will drop off or be damaged. Therefore, although it is necessary to implement the opening and closing timing of the front and back claws with high precision by the drive device, the opening and closing timing of the front and back claws is highly accurate due to the assembly accuracy of the lever and link, the vibration of the reverse cylinder, etc. It becomes difficult to control. Further, when the sector gear is used for the claw turning device, the opening and closing of the front and back claws varies due to backlash, making it difficult to control the opening and closing timing of the front and back claws with high accuracy.

  Therefore, in the conventional reversing device (Patent Document 2), the nail shaft to be mounted on the reversing drum is configured in a coaxial double structure, the front nail is mounted on the outer nail shaft, and the back nail is mounted on the inner nail shaft. By doing this, the front and back claws can be used to hold the sheet and turn it over. However, in such a configuration, in addition to the opening and closing operations of the front and back claws, the rotation angle of the front and back claws (claw shaft) for the reversing operation of the sheet becomes extremely large, and the conventional reversing device In the claw turning device composed of five levers and links as in (Patent Document 1), the turning angle cannot be secured.

  The present invention solves the above-described problems, and an object of the present invention is to provide a sheet-fed printing press reversing apparatus and a sheet-fed printing press capable of improving the accuracy of sheet reversing operation.

  In order to achieve the above object, a reversing device for a sheet-fed printing press according to a first aspect of the present invention is provided with a reversing cylinder rotatably disposed between a pair of printing units, and provided on an outer peripheral portion of the reversing cylinder. A claw device having a claw member for gripping a rear end portion of a conveyed sheet, and a claw drive device for rotating the claw device around a claw shaft to reverse the front and back of the sheet, the claw drive device Has a first link mechanism that can rotate the cam input shaft by operating a cam follower by a cam on the frame side, and a second link mechanism that can rotate the pawl device by rotating the cam input shaft. The link mechanism of either the first link mechanism or the second link mechanism includes at least four connection links that connect the cam input shaft and the cam follower or the claw shaft, and at least one of the connection links. Guy connecting part Composed of a guide mechanism, it is characterized in.

  In the reversing device for a sheet-fed printing press according to a second aspect of the present invention, the guide mechanism includes a guide roller pivotally attached to a connection portion of the connection link, and a track for guiding the movement of the guide roller. It is said.

  In a reversing device for a sheet-fed printing press according to a third aspect of the invention, the track has a first guide surface and a second guide surface on which the guide roller rolls.

  In a reversing device for a sheet-fed printing press according to a fourth aspect of the present invention, a roller pressing mechanism for pressing the guide roller against the first guide surface is provided.

  The reversing device for a sheet-fed printing press according to a fifth aspect of the present invention is characterized in that the track forms an S-shaped rail, and the guide roller can roll while sandwiching the rail.

  The reversing device for a sheet-fed printing press according to a sixth aspect of the present invention is characterized in that the guide roller is provided at an intermediate connecting portion of four connecting links connected in series.

  The reversing device for a sheet-fed printing press according to a seventh aspect of the invention is characterized in that a trajectory adjusting mechanism capable of adjusting the position of the trajectory is provided.

  In the reversing device of the sheet-fed printing press according to the invention of claim 8, the claw device includes a front claw shaft that is coaxially provided and has a cylindrical shape, a back claw shaft that has a columnar shape, and the claw member as the claw member. A front claw connected to a shaft and a back claw connected to the back claw shaft, and the claw driving device rotates the front claw and the back claw using the front claw shaft and the back claw shaft as a fulcrum. It is characterized by moving.

  In the reversing device of the sheet-fed printing press according to the ninth aspect of the invention, the claw driving device can turn and release the sheet by independently rotating the front and back claws, By rotating the front and back claws integrally, the front and back of the gripped sheet can be reversed.

  A sheet-fed printing press according to a tenth aspect of the present invention is a sheet feeding unit that sucks and feeds sheets stacked on a sheet feeding table, and transfers ink supplied from an inking device to a rubber cylinder via a plate cylinder to the sheet. Printing is performed by the printing unit having a plurality of printing units that perform printing, a reversing device that is provided between the plurality of printing units and holds the rear end portion of the sheet and reverses the front and back, and the printing unit. And a sheet discharge unit that stacks and discharges the stacked sheets on a sheet discharge table, wherein the reversing device is provided with a rotatable reversing cylinder and an outer periphery of the reversing cylinder, and is disposed behind the sheet. A claw device having a claw member that grips the end portion and a claw drive device that rotates the claw device with a claw shaft as a fulcrum. The claw drive device is configured such that a cam follower is operated by a cam on the frame side. A first link mechanism capable of rotating the input shaft; A second link mechanism capable of rotating the claw device by rotation of the cam input shaft, and either one of the first link mechanism or the second link mechanism includes the cam input shaft and the second link mechanism; It comprises at least four connecting links that connect the cam follower or the claw shaft, and a guide mechanism that guides at least one connecting portion of the connecting links.

  According to the reversing device of the sheet-fed printing press according to the first aspect of the present invention, the reversing cylinder, the claw device, and the claw driving device are provided, and the cam input shaft can be rotated by operating the cam follower as the claw driving device. A first link mechanism and a second link mechanism capable of rotating the pawl device by rotating the cam input shaft are provided, and either the first link mechanism or the second link mechanism is connected to the cam input shaft and the cam follower. Or it is comprised from the guide mechanism which guides the at least 4 connection link which connects a nail | claw axis | shaft, and at least 1 connection part of a connection link.

  Therefore, the claw driving device is constituted by the first link mechanism and the second link mechanism, and one link mechanism is constituted by the four connecting links and the guide mechanism for guiding the connecting portion, thereby eliminating rattling due to backlash. In addition, a sufficient rotation angle in the claw device can be ensured, and the sheet reversing operation can be highly accurate.

  According to the reversing device of the sheet-fed printing press of the invention of claim 2, since the guide mechanism is provided with the guide roller pivotally attached to the connecting portion of the connecting link and the track for guiding the movement of the guide roller, Since the movement is guided by the track through the guide roller, the swinging of the link mechanism can be restricted to enable the sheet reversing operation with high accuracy.

  According to the reversing device of the sheet-fed printing press of the invention of claim 3, since the first guide surface and the second guide surface on which the guide roller rolls are provided as the track, the link mechanism can be swung with a simple configuration. It is possible to regulate, and the structure can be simplified.

  According to the reversing device of the sheet-fed printing press of the invention of claim 4, since the roller pressing mechanism that presses the guide roller against the first guide surface is provided, rattling when the link mechanism swings is appropriately suppressed. be able to.

  According to the reversing device for the sheet-fed printing press of the invention of claim 5, since the track is an S-shaped rail, and the guide roller can roll while sandwiching the rail, the link mechanism is interposed via the guide roller. Since the guide is properly guided by the rail, the swing of the link mechanism can be restricted with a simple configuration, and the rattling when the link mechanism swings can be appropriately suppressed.

  According to the reversing device of the sheet-fed printing press of the invention of claim 6, since the guide roller is provided in the intermediate connecting portion in the four connecting links connected in series, the link mechanism is efficiently regulated, so that smooth Operation may be possible.

  According to the reversing device of the sheet-fed printing press of the invention of claim 7, since the track adjusting mechanism capable of adjusting the track position is provided, wear due to long-term use in addition to manufacturing errors and assembly errors of the constituent members At the time of occurrence, by adjusting the position of the track by the track adjusting mechanism, it is possible to always ensure the highly accurate operation of the link mechanism.

  According to the reversing device of the sheet-fed printing press according to the eighth aspect of the present invention, the nail device is connected to the front nail shaft and the front nail shaft that is provided coaxially and has a cylindrical shape and the back nail shaft that has a cylindrical shape. The front claw and the back claw connected to the back claw shaft are provided, and the claw driving device rotates the front claw and the back claw using the front claw shaft and the back claw shaft as a fulcrum, so that the structure can be simplified. In addition, the claw device can be operated stably.

  According to the reversing device of the sheet-fed printing press according to the ninth aspect of the invention, the nail driving device enables the sheet to be held and released by rotating the front and back nails independently. By rotating the nail and the back nail together, the front and back of the gripped sheet can be reversed, so that an opening / closing mechanism for opening and closing the front nail and the back nail is unnecessary, and the configuration can be simplified. it can.

  According to the sheet-fed printing press of the invention of claim 10, the sheet feeding unit, the printing unit, the reversing device, and the paper discharge unit are provided. As the reversing device, the reversing cylinder, the claw device, and the claw driving device are provided. As the drive device, a first link mechanism that can rotate the cam input shaft by operating the cam follower and a second link mechanism that can rotate the pawl device by rotating the cam input shaft are provided. Any one of the second link mechanisms is composed of at least four connecting links that connect the cam input shaft and the cam follower or the claw shaft, and a guide mechanism that guides at least one connecting portion of the connecting links. Yes.

  Therefore, the claw driving device is constituted by the first link mechanism and the second link mechanism, and one link mechanism is constituted by the four connecting links and the guide mechanism for guiding the connecting portion, thereby eliminating rattling due to backlash. In addition, a sufficient rotation angle in the nail device can be ensured, and the sheet reversing operation can be performed with high accuracy. As a result, the print quality can be improved.

  Exemplary embodiments of a reversing apparatus for a sheet-fed printing press and a sheet-fed printing press according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a schematic diagram illustrating first and second link mechanisms in a reversing device for a sheet-fed printing press according to a first embodiment of the present invention, and FIG. 2 is a second diagram illustrating a second reversing device in the sheet-fed printing press according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a link mechanism, FIG. 3 is a schematic diagram illustrating a nail device in the reversing device of the sheet-fed printing press of Example 1, and FIG. 4 is a schematic diagram illustrating a reversing device of the sheet-fed printing press of Example 1. FIGS. 5 to 9 are schematic diagrams illustrating the operation of the nail device in the reversing device of the sheet-fed printing press according to the first embodiment, and FIGS. 10 to 15 illustrate the reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. FIG. 16 is a schematic diagram illustrating the sheet-fed printing press according to the first embodiment.

  The offset sheet-fed printing machine of this embodiment is a printing machine capable of performing single-sided printing and double-sided printing. As shown in FIG. 16, a sheet feeding device (sheet feeding unit) 11 and a sheet conveying unit (sheet conveying unit) ) 12, a printing device (printing unit) 13, a sheet reversing device (sheet reversing unit) 14, and a paper discharging device (paper discharging unit) 15.

  The paper feeding device 11 includes a paper feeding table 21 and a paper feeding mechanism (separator device) 22. The paper feed table 21 stacks and places the print sheets S. The paper feed mechanism 22 picks up a large number of print sheets S stacked on the paper feed table 21 one by one from the top. It will be sent out. In this case, the paper feed table 21 can move up and down in response to the supply of the print sheet S so that the paper feed mechanism 22 can maintain a substantially constant height positional relationship with the print sheet S.

  The sheet conveying device 12 conveys the printing sheet S sent out from the paper feeding device 11 and positions it at a predetermined position, and supplies it to the printing device 13. In this sheet conveying device 12, a feed roller 23 and a holding roller 24 are arranged in contact with each other adjacent to the paper feeding device 11, and a conveying belt 25 wound around a plurality of guide rollers is arranged for printing. A front pad 26 is arranged adjacent to the device 13.

  The printing apparatus 13 includes four printing units 28, corresponding to four colors of black, black, magenta, and yellow so that two-color printing or color printing can be realized. 29, 30, and 31. Each printing unit 28, 29, 30, 31 has substantially the same configuration, and includes an inking device (not shown), a plate cylinder 32, a blanket cylinder 33, and an impression cylinder 34, and each printing unit 28, 29, 30, An intermediate cylinder 35 is provided between 31. The plate cylinder 32, the blanket cylinder 33, and the impression cylinder 34 are arranged so as to contact each other in this order from the upper side to the lower side in the vertical direction, and ink is supplied to the blanket cylinder 33 via the plate cylinder 32 by an inking device. When the printing sheet S passes between the blanket cylinder 33 and the impression cylinder 34, the ink (printed image) is transferred from the blanket cylinder 33 to the printing sheet S.

  The sheet reversing device 14 is disposed between the printing units 29 and 30 and reverses the front and back of the printing sheet S and the conveying direction during printing when performing duplex printing. The sheet inverting device 14 includes an inverting intermediate cylinder 36, an inverting double cylinder intermediate cylinder 37, and an inverting cylinder 38. Therefore, when performing single-sided printing, the printing sheet S is printed from the printing unit 29 through the reverse intermediate cylinder 36, the reverse double cylinder intermediate cylinder 37, and the reverse cylinder 38, with the front and back sides of the print sheet S and the transport direction unchanged. Sent to unit 30. On the other hand, when performing duplex printing, the printing sheet S is sent from the reversing intermediate cylinder 36 to the reversing double cylinder intermediate cylinder 37 from the printing unit 29, and the reversing cylinder 38 reverses the front and back of the printing sheet S and the conveying direction. After that, it is sent to the printing unit 30.

  The paper discharge device 15 conveys the print sheets S printed by the printing device 13 and stacks them in an aligned state. The paper discharge device 14 appropriately supports the chain gripper mechanism 41 that conveys the print sheet S, the paper discharge tray 42 on which the printed print sheets S are stacked, and the print sheet S that is conveyed by the chain gripper mechanism 41. The sheet support unit 43 that discharges the sheet to the sheet discharge table 42 and the sheet pad 44 that regulates the downstream position of the print sheet S in the traveling direction on the sheet discharge table 42 are provided. The chain gripper mechanism 41 receives the print sheet S from the print unit 31 disposed on the most downstream side with respect to the traveling direction of the print sheet S and conveys the print sheet S to a predetermined position above the paper discharge table 42. When the top surface height of the uppermost stage rises as the printing sheets S are stacked, the paper discharge table 42 moves up and down continuously or stepwise so that the falling distance of the printing sheets S becomes substantially constant. It is possible.

  Therefore, in the above-described offset sheet-fed printing press of this embodiment, when performing duplex printing, the print sheets S stacked on the paper feed tray 21 of the paper feeder 11 are fed one by one from the top by the paper feed mechanism 22. The sheet is taken out and sent to the sheet conveying device 12. The sheet conveying device 12 positions the print sheet S at a predetermined position, and then sequentially supplies it to the printing device 13. In this printing apparatus 13, two-color printing is performed on the surface of the printing sheet S for each of the printing units 28 and 29, and then, from the reversal intermediate cylinder 36 to the reversal double cylinder intermediate cylinder 37 in the sheet reversing apparatus 14. The nail member of the reversing cylinder 38 picks up the rear end portion of the printing sheet S, and the nail member is reversed while the printing sheet S is conveyed along with the rotation of the reversing cylinder 38. The end of the sheet S is sent to the printing unit 30 as the front end. Then, after two colors are printed on the back surface of the print sheet S for each of the printing units 30 and 31, the printed print sheet S is transferred from the printing device 13 to the chain gripper mechanism of the paper discharge device 15. The paper is conveyed while being picked up by 41 and stacked on the paper discharge tray 42.

  Here, the configuration and operation of the sheet reversing device 14 in the offset sheet-fed printing press according to the first embodiment will be described in detail.

  In the sheet reversing device 14 in the offset sheet-fed printing press according to the first embodiment, as illustrated in FIG. 4, the reversing cylinder 38 is in contact with both between the reversing cylinder intermediate cylinder 37 and the impression cylinder 34 of the printing unit 30. And can be rotated synchronously. The reversing body 38 is provided with a claw device 51 at equal intervals in the circumferential direction on the outer peripheral portion, and this claw device 51 can be driven by a claw driving device 52 (see FIG. 1) described later. . Similarly, the inverted double cylinder middle cylinder 37 and the impression cylinder 34 are provided with claw devices 37a and 34a at equal intervals in the circumferential direction on the outer periphery, and the claw devices 37a and 34a are claw drive units (not shown). It can be driven by the device.

  In this claw device 51, as shown in FIGS. 1 to 3, a pair of frames (operation side frame and drive side frame) 53 in the reversing drum 38 is provided with an outer claw shaft (front claw shaft) 54 constituting a claw shaft. And end portions of the inner claw shaft (back claw shaft) 55 are rotatably supported by a bearing 56. That is, the outer claw shaft 54 has a cylindrical shape, while the inner claw shaft 55 has a columnar shape. The inner claw shaft 55 is disposed inside the outer claw shaft 54 and is relatively rotatable. A front claw 58 is fixed to the outer claw shaft 54 via a bracket 57, a back claw 60 is fixed to the inner claw shaft 55 via a bracket 59, and the bracket 59 of the inner claw shaft 55 is , Projecting to the outside through an opening 54 a formed in the outer claw shaft 54. The front claw 58 and the back claw 60 can be opened and closed by rotating the claw shafts 54 and 55, and can hold or release the print sheet S. A plurality of front claws 58 and back claws 60 are provided at predetermined intervals in the axial direction of the claw shafts 54 and 55.

  Therefore, by rotating the outer claw shaft 54, the front claw 58 can be operated to open and close the back claw 60, and by rotating the inner claw shaft 55, the back claw 60 can be operated. The front nail 58 can be opened and closed. Further, by rotating the outer claw shaft 54 and the inner claw shaft 55 in synchronization, the front claw 58 and the back claw 60 can be reversed while being closed or opened.

  The claw driving device 52 includes a front claw driving device that operates the front claw 58 through the outer claw shaft 54 and a back claw driving device that operates the back claw 60 through the inner claw shaft 55. . Since the front claw driving device and the back claw driving device are symmetrical in the left-right direction (operation side and driving side) and have the same configuration, in the following description, the claw driving device 52 will be described as the front claw driving device. To do. In this case, the front claw driving device 52 is arranged on the operation side, and the back claw driving device is arranged on the driving side.

  As shown in FIGS. 1 and 2, the front claw driving device 52 includes a first link mechanism 61 and a second link mechanism 62. A revolving cam 63 having a ring shape is fixed to the reversing body 38 on the frame 53 side. The first link mechanism 61 can rotate the cam input shaft 65 when the cam follower 64 is operated by the turning cam 63. Further, the second link mechanism 62 can rotate the claw device 51 by rotating the cam input shaft 65. One of the first link mechanism 61 and the second link mechanism 62 (in this embodiment, the second link mechanism 62) includes a cam input shaft 65 and a cam follower 64 or pawl shafts 54 and 55 (this embodiment). In the example, it is composed of at least four connecting links that connect the claw shafts 54 and 55) and a guide mechanism that guides at least one connecting portion of each connecting link.

  In the first link mechanism 61, a support shaft 66 is supported on the frame 53, and an L-shaped first connection link 67 is rotatably supported on the support shaft 66. A cam follower 64 is rotatably attached to one end of the first connection link 67 by a connection shaft 68. One end portion of the second connection link 69 is rotatably supported by the support shaft 66, and one end portion of the third connection link 70 is rotated by the connection shaft 71 to the other end portion of the second connection link 69. It is connected freely. In this case, an engaging portion 67a is formed at the other end of the first connecting link 67, an engaged portion 69a is formed at the second connecting link 69, and the first connecting link 67 is counterclockwise in FIG. When the first connecting link 67 rotates in the clockwise direction in FIG. 1, the engaging portion 67a can be pressed against the engaged portion 69a. Is separated from the engaged portion 69a. The first connecting link 67 is urged and supported in a clockwise direction in FIG. 1 by a torsion bar (not shown), and is urged and supported in a direction in which the cam follower 64 contacts the turning cam 63.

  A cam input shaft 65 is supported on the frame 53, and one end portion of the fourth connection link 72 is fixed to the cam input shaft 65, and the other end portion of the fourth connection link 72 is fixed to the cam input shaft 65. The other end of the third connection link 70 is rotatably connected by the connection shaft 73.

  As described above, the first link mechanism 61 includes the first connection link 67, the second connection link 69, the third connection link 70, and the fourth connection link 72 that connect the cam follower 64 and the cam input shaft 65.

  In the second link mechanism 62, one end portion of the fifth connection link 74 is fixed to the cam input shaft 65, and the sixth connection link 76 is connected to the other end portion of the fifth connection link 74 by the connection shaft 75. One end of each is rotatably connected. In addition, one end of a seventh connection link 78 is rotatably connected to the other end of the sixth connection link 76 by a connection shaft 77. One end of an eighth connecting link 79 is fixed to the outer claw shaft 54 of the claw device 51, and the other end of the seventh connecting link 78 is connected to the other end of the eighth connecting link 79 by a connecting shaft 80. The parts are connected rotatably.

  As described above, the second link mechanism 62 includes the fifth connection link 74, the sixth connection link 76, the seventh connection link 78, and the eighth connection link 79 that connect the cam input shaft 65 and the outer claw shaft 54 of the claw device 51. It is configured.

  Further, the second link mechanism 62 is provided with a guide mechanism 81 that regulates the swinging of the connecting links 74, 76, 78, 79. That is, the guide roller 82 is rotatably mounted on an intermediate connecting shaft (connecting portion) 77 of the four connecting links 74, 76, 78, 79 connected in series. On the other hand, a first bracket 83 having a first guide surface 83a on which the guide roller 82 rolls and a second bracket 84 having a second guide surface 84a are fixed to the frame 53, and this first guide surface is fixed. 83a and the second guide surface 84a form an S-shaped track 85.

  In this case, each bracket 83, 84 is fastened to the frame 53 by fixing bolts 86a, 86b, 87a, 87b, but one fixing bolt 86b, 87b is a long hole 83b formed in each bracket 83, 84. , 84b and screwed into the frame 53. Therefore, when the fixing bolts 86a, 86b, 87a, 87b are loosened, the first guide surface 83a and the second guide surface 84a, that is, the track 85 are moved by moving the brackets 83, 84 along the long holes 83b, 84b. Can be adjusted. In this case, the track adjusting mechanism of the present invention is constituted by the fixing bolts 86a, 86b, 87a, 87b and the long holes 83b, 84b. In this case, the track adjusting mechanism is not limited to the fixing bolts 86a, 86b, 87a, 87b and the long holes 83b, 84b. In other words, the brackets 83 and 84 are supported by the long holes so as to be movable by a predetermined distance, and the brackets 83 and 84 are pressed and supported in the direction in which the guide surfaces 83a and 84a are pressed against the guide roller 82 by the biasing springs. Good.

  Further, a stopper 88 as a roller pressing mechanism that presses the guide roller 82 against the first guide surface 83a is fixed to the fifth connection link 74 by restricting the rotation of the sixth connection link 76. This stopper 88 is counterclockwise in FIG. 1 in the sixth connecting link 76 with the connecting shaft 75 as a fulcrum when the fifth connecting link 74 rotates clockwise in FIG. 1 with the cam input shaft 65 as a fulcrum. By restricting the amount of rotation in the rotation direction, the guide roller 82 is prevented from being separated from the first guide surface 83a. In this case, the roller pressing mechanism is not limited to the stopper 88. In other words, an urging spring (compression spring) is interposed between the fifth connection link 74 and the sixth connection link 76 to restrict the rotation of the sixth connection link 76, and the guide roller 82 is connected to the compression spring. You may comprise so that it may press on the 1st guide surface 83a with urging | biasing force.

  Here, the operation of the first link mechanism 61 and the second link mechanism 62 in the front claw driving device 52 will be described with reference to FIGS. 1 and 5 to 9. In the following description, it is assumed that the back claw drive device operates in synchronization with the operation of the front claw drive device 52.

  In the first link mechanism 61 of the front claw driving device 52, as shown in FIG. 1, the cam follower 64 is pressed against the turning cam 63, so that when the reversing cylinder 38 rotates clockwise in FIG. The cam follower 64 moves according to the cam profile of the turning cam 63. That is, when the cam follower 64 moves to the axial center side of the reversing cylinder 38 by the turning cam 63, the first connection link 67 rotates clockwise in FIG. 1 with the connection shaft 66 as a fulcrum, and the second connection link 69. Is also rotated clockwise in FIG. 1 with the connecting shaft 66 as a fulcrum.

  When the second connecting link 69 rotates in the clockwise direction, the fourth connecting link 72 is pushed upward in FIG. 1 via the third connecting link 70, and the cam input shaft 65 is rotated counterclockwise in FIG. Rotate. Then, the rotation amount of the cam input shaft 65 is transmitted to the second link mechanism 62, and the second link mechanism 62 operates.

  In the second link mechanism 62 of the front claw driving device 52, as shown in FIG. 5, when the cam input shaft 65 rotates in the clockwise direction from this state, the fifth connecting link 74 integrated with the cam input shaft 65 is also provided. It rotates in the same direction. Then, as shown in FIG. 6, the fifth connection link 74 rotates clockwise with the cam input shaft 65 as a fulcrum, and the sixth connection link 76 is pulled to the right, and the seventh and eighth connection links 78, The outer claw shaft 54 is rotated via 79. At this time, the back claw driving device also operates in synchronization and rotates the inner claw shaft 55, so that the front claw 58 and the back claw 60 rotate in a counterclockwise direction in synchronization. At this time, as shown in FIGS. 6 and 7, the guide roller 82 moves while being guided by the second guide surface 84a, so that the swing of each of the connecting links 74, 76, 78, 79 is restricted, and the cam The turning force of the input shaft 65 is properly transmitted to the claw shafts 54 and 55, and the front claw 58 and the back claw 60 can be rotated.

  Then, when the cam input shaft 65 further rotates in the clockwise direction, the guide roller 82 moves from the second guide surface 84a to the first guide surface 83a as shown in FIG. 8, and as shown in FIG. 9, the guide roller 82 As the 82 moves while being guided by the first guide surface 83 a, the swing of each of the connecting links 74, 76, 78, 79 is restricted, and the front claw 58 and the back claw 60 are connected via the claw shafts 54, 55. Can be rotated.

  Next, the operation of the sheet reversing device 14 of this embodiment will be described with reference to FIGS. 4 and 10 to 15. In this case, one claw device is omitted in FIGS. In this description, it is assumed that the back claw drive device also operates in synchronization with the operation of the front claw drive device 52.

  When double-sided printing is performed by an offset sheet-fed printing machine, in the sheet reversing device 14, as illustrated in FIG. 4, the reversing cylinder middle cylinder 37 rotates counterclockwise, and the nail device 37 a is moved to the front end of the printing sheet S. On the other hand, the reversing drum 38 rotates in the clockwise direction while the claw device 51 remains open. Then, the rear end portion of the print sheet S conveyed by the reversing cylinder intermediate cylinder 37 approaches the contact portion with the reversing cylinder 38, and the claw device 51 of the reversing cylinder 38 contacts the reversing cylinder intermediate cylinder 37. When approaching the part, the back claw driving device is actuated to close the back claw 60, whereby the rear end of the printed sheet S is picked up.

  That is, the first link mechanism and the second link mechanism constituting the back claw drive device are operated by the swing cam (not shown), and the inner claw shaft 55 is rotated clockwise in FIG. As described above, the rear end portion of the print sheet S is held by the front and back claws 58 and the back claws 60. When the claw device 51 of the reversing cylinder 38 grips the rear end portion of the printing sheet S, the claw device 37a of the reversing double cylinder intermediate cylinder 37 releases the gripping of the front end portion of the printing sheet S.

  When the back claw 60 is rotated by the back claw drive device and the rear edge portion of the print sheet S is gripped together with the front claw 58, the front claw drive device 52 and the back claw drive device are operated synchronously and reversed. The front nail 58 and the back nail 60 are reversed with the rotation of the cylinder 38, and the rear end portion of the printed sheet S held between the front nail 58 and the back nail 60 is conveyed as the front end portion.

  That is, in the front claw driving device 52, the first link mechanism 61 and the second link mechanism 62 are operated by the turning cam 63, and the outer claw shaft 54 is rotated counterclockwise in FIG. Further, in synchronization with the operation of the front claw driving device 52, the first link mechanism and the second link mechanism of the back claw driving device are operated, and the inner claw shaft 55 is rotated counterclockwise in FIG. . Then, as shown in FIGS. 11 to 13, the outer claw shaft 54 and the inner claw shaft 55 are rotated in the counterclockwise direction synchronously, and the front claw 58 and the back claw 60 are arranged at the rear end portion of the printing sheet S. Rotate about 200 degrees with the gripping being held, and the rear end portion of the print sheet S gripped by the front and back claws 58 and 60 is defined as the front end portion.

  When the front claw 58 (outer claw shaft 54) and the back claw 60 (inner claw shaft 55) rotate by a predetermined angle as the reversing drum 38 rotates in the clockwise direction, the front claw driving device 52 and the back claw drive are driven. The rotation of the claw device 51 by the device stops.

  The reversing cylinder 38 holding the printing sheet S rotates in the clockwise direction, the claw device 51 holding the printing sheet S approaches the contact part with the impression cylinder 34, and the claw device 34 a of the impression cylinder 34 is the reversing cylinder 38. As shown in FIG. 14, the claw device 34a of the impression cylinder 34 grips the front end portion of the printing sheet S, and the front claw driving device 52 operates to open the front claw 58, as shown in FIG. Then, the front end of the printing sheet S is released.

  That is, the first link mechanism 61 and the second link mechanism 62 constituting the front claw driving device 52 are operated by the turning cam 63, and the outer claw shaft 54 is rotated clockwise in FIG. The grip of the print sheet S by the back nails 60 is released. As shown in FIG. 15, when the nail device 34 a holds the printing sheet S, the impression cylinder 34 rotates counterclockwise to convey the printing sheet S, while the reversing cylinder 38 includes the nail device 51. The front claw 58 and the back claw 60 are opened and rotated in the clockwise direction, and the next printing sheet S conveyed by the reverse double cylinder middle cylinder 37 is received.

  When single-sided printing is performed by an offset sheet-fed printing press, when the nail device 51 of the reversing cylinder 38 approaches the contact portion with the reversing double cylinder intermediate cylinder 37, the front nail driving device is activated to operate the front nail 58. Is closed, while the front end portion of the printing sheet S is held, the nail device 37a of the reversing cylinder middle cylinder 37 separates the front end portion of the printing sheet S, and the reversing cylinder 38 has the nail device 51 connected to the front end of the printing sheet S. Rotate while holding the part. When the claw device 51 of the reversing cylinder 38 approaches the contact portion with the impression cylinder 34, the claw device 34a of the impression cylinder 34 holds the front end portion of the print sheet S, while the front claw driving device 52 is activated. By opening the front nail 58, the front end of the printing sheet S is released, and the impression cylinder 34 is conveyed by the nail device 34a holding the printing sheet S.

  As described above, in the reversing device of the sheet-fed printing press according to the first embodiment, the nail device 51 having the front and back claws 58 and the back claws 60 for holding the rear end portion of the printing sheet S is provided on the outer periphery of the reversing cylinder 38. The claw device 51 is rotated by the claw driving device 52 with the claw shafts 54 and 55 as fulcrums so that the front and back of the printing sheet S can be reversed, and the claw driving device 52 is operated by the cam follower 64 by the turning cam 63. The first link mechanism 61 that can rotate the cam input shaft 65 and the second link mechanism 62 that can rotate the claw device 51 by the rotation of the cam input shaft 65 are configured. From at least four connecting links 74, 76, 78, 79 that connect the shaft 65 and the claw shafts 54, 55, and a guide mechanism 81 that guides one connecting shaft 77 of each connecting link 74, 76, 78, 79. It is composed.

  Therefore, the claw driving device 52 is constituted by the first link mechanism 61 and the second link mechanism 62, and the second link mechanism 62 is constituted by the four connecting links 74, 76, 78, 79 and the guide mechanism 81. Since the gear mechanism is not required, rattling due to backlash can be eliminated, and a sufficient rotation angle in the claw device 51 can be secured, and the sheet reversing operation can be highly accurate.

  In the reversing device of the sheet-fed printing press according to the first embodiment, as the guide mechanism 81, the guide roller 82 pivotally attached to the connecting shaft 77, the first guide surface 83a that guides the movement of the guide roller 82, and the second guide. A track 85 composed of a surface 84a is provided. Accordingly, the movement of the connecting links 74, 76, 78, and 79 is guided by the track 85 via the guide roller 82, so that the swinging of the second link mechanism 62 is restricted and the sheet reversing operation can be performed with high accuracy. In addition, the structure can be simplified.

  In the reversing device of the sheet-fed printing press according to the first embodiment, a stopper 88 (or an urging spring) is provided as a roller pressing mechanism that presses the guide roller 82 against the first guide surface 83a. Therefore, rattling when the second link mechanism 62 swings can be appropriately suppressed.

  In the reversing device of the sheet-fed printing press according to the first embodiment, the brackets 83 and 84 formed with the first guide surface 83a and the second guide surface 84a are long as a track adjustment mechanism capable of adjusting the position of the track 85. Holes 83b and 84b (or urging springs) are provided. Therefore, in addition to the manufacturing errors and assembly errors of the constituent members, the high-precision operation of the second link mechanism 62 can always be secured by adjusting the position of the track 85 when wear occurs due to long-term use. it can.

  In the reversing device of the sheet-fed printing press according to the first embodiment, as the nail device 51, an outer nail shaft (front nail shaft) 54 that is coaxially provided and forms a cylindrical shape and an inner nail shaft (back nail) that forms a columnar shape. The claw driving device 52 rotates the front claw 58 and the back claw 60 around the claw shafts 54 and 55 as fulcrums. It is possible to move. Therefore, the structure can be simplified and the claw device 51 can be stably operated.

  In the reversing device of the sheet-fed printing press according to the first embodiment, the claw driving device 52 rotates the front claw 58 and the back claw 60 independently by the cam profile of the swivel cam 63, thereby The front and back of the printed printing sheet S can be reversed by rotating the front and back claws 58 and 60 together. Therefore, the opening / closing mechanism for opening / closing the front claw 58 and the back claw 60 is not required, and the configuration can be simplified.

  Further, the offset sheet-fed printing press according to the present embodiment includes a sheet feeding device 11, a sheet conveying device 12, a printing device 13, a sheet reversing device 14, and a paper discharging device 15, and the sheet reversing device 14 is reversed. A cylinder 38, a claw device 51, and a claw driving device 52 are provided, and a claw device 51 having a front claw 58 and a back claw 60 for holding the rear end portion of the printing sheet S is provided on the outer periphery of the reversing cylinder 38. The sheet reversing device 14 is configured so that the front and back of the printed sheet S can be reversed by rotating the claw shafts 54 and 55 by the claw driving device 52 and the cam follower 64 is operated by the swiveling cam 63. Thus, the first link mechanism 61 that can rotate the cam input shaft 65 and the second link mechanism 62 that can rotate the claw device 51 by the rotation of the cam input shaft 65 are configured. Cam input shaft 65 and It comprises at least four connecting links 74, 76, 78, 79 for connecting the shafts 54, 55, and a guide mechanism 81 for guiding one connecting shaft 77 of each connecting link 74, 76, 78, 79. .

  Therefore, the claw driving device 52 is constituted by the first link mechanism 61 and the second link mechanism 62, and the second link mechanism 62 is constituted by the four connecting links 74, 76, 78, 79 and the guide mechanism 81. Since the gear mechanism is unnecessary, rattling due to backlash can be eliminated, a sufficient rotation angle in the claw device 51 can be secured, and the sheet reversing operation can be made highly accurate. As a result, the print quality can be improved.

  FIG. 17 is a schematic diagram illustrating first and second link mechanisms in the reversing device of the sheet-fed printing press according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the sheet reversing device in the offset sheet-fed printing press according to the second embodiment, as shown in FIG. 17, the reversing drum 38 is provided with a nail device 51 and a nail driving device 101 for driving the nail device 51. ing. The claw drive device 101 includes a front claw drive device that operates the front claw 58 via the outer claw shaft 54 and a back claw drive device that operates the back claw 60 via the inner claw shaft 55. Here, the claw driving device 52 will be described as a front claw driving device. In this case, the front claw driving device 101 is arranged on the operation side, and the back claw driving device (not shown) is arranged on the driving side.

  The front claw driving device 101 includes a first link mechanism 61 and a second link mechanism 102. The first link mechanism 61 is capable of rotating the cam input shaft 65 by operating a cam follower by a turning cam. Further, the second link mechanism 102 can rotate the claw device 51 by rotating the cam input shaft 65. One of the first link mechanism 61 and the second link mechanism 102 (in this embodiment, the second link mechanism 102) includes a cam input shaft 65 and cam followers or pawl shafts 54 and 55 (in this embodiment). Then, it is comprised from the at least 4 connection link which connects the nail | claw axis | shafts 54 and 55), and the guide mechanism which guides the at least 1 connection part of each connection link.

  Note that the first link mechanism 61 is the same as that of the first embodiment, and thus the description thereof is omitted.

  In the second link mechanism 102, one end of a fifth connection link 74 is fixed to the cam input shaft 65, and a sixth connection link 77 is connected to the other end of the fifth connection link 74 by a connection shaft 75. One end of each is rotatably connected. In addition, one end of a seventh connecting link 78 is rotatably connected to the other end of the sixth connecting link 76 by a connecting shaft 76. One end of an eighth connecting link 79 is fixed to the outer claw shaft 54 of the claw device 51, and the other end of the seventh connecting link 78 is connected to the other end of the eighth connecting link 79 by a connecting shaft 80. The parts are connected rotatably. As described above, the second link mechanism 102 includes the fifth connection link 74, the sixth connection link 76, the seventh connection link 78, and the eighth connection link 79 that connect the cam input shaft 65 and the outer claw shaft 54 of the claw device 51. It is configured.

  In addition, the second link mechanism 102 is provided with a guide mechanism 103 that regulates the swinging of the connecting links 74, 76, 78, and 79. That is, the support plate 104 is rotatably mounted on the connection shaft 77 of each connection link 76, 78, and a pair of guide rollers 105, 106 are rotatably mounted on the support plate 104. On the other hand, a bracket 108 having an S-shaped track 107 held between the guide rollers 105 and 106 is fixed to the frame 53 by fixing bolts 109. The track 107 has a first guide surface 107a on which the guide roller 105 rolls and a second guide surface 107b on which the guide roller 106 rolls.

  Here, the operation of the front claw driving device 101 will be described. In the following description, it is assumed that the back claw drive device operates in synchronization with the operation of the front claw drive device 101.

  When the cam input shaft 65 rotates counterclockwise in FIG. 17 by the first link mechanism 61 of the front claw driving device 101, the rotation amount of the cam input shaft 65 is transmitted to the second link mechanism 102, and this second The link mechanism 102 operates.

  That is, when the cam input shaft 65 rotates counterclockwise, the fifth connection link 74 integral with the cam input shaft 65 also rotates in the same direction, and the seventh connection link 78 via the sixth connection link 76. Is pushed to the left, and the outer claw shaft 54 is rotated clockwise through the eighth connecting link 79. At this time, the back claw driving device also operates in synchronization and rotates the inner claw shaft 55, so that the front claw 58 and the back claw 60 rotate in a counterclockwise direction in synchronization. At this time, the guide rollers 105 and 106 hold the track 107, and move while being guided by the first and second guide surfaces 107a and 107b, thereby swinging the connecting links 74, 76, 78, and 79. Is restricted, and the rotational force of the cam input shaft 65 is properly transmitted to the claw shafts 54 and 55, so that the front claw 58 and the back claw 60 can be rotated.

  As described above, in the reversing device of the sheet-fed printing press according to the second embodiment, the nail driving device 101 includes the first link mechanism 61 that can rotate the cam input shaft 65 by the cam follower being operated by the swing cam; The claw device 51 can be rotated by the rotation of the cam input shaft 65, and the second link mechanism 102 is connected to the cam input shaft 65 and the claw shafts 54, 55. The link 74, 76, 78, 79 and the guide mechanism 103 that guides one connection shaft 77 of each of the connection links 74, 76, 78, 79 are configured.

  Therefore, the claw driving device 101 is composed of the first link mechanism 61 and the second link mechanism 102, and the second link mechanism 102 is composed of the four connecting links 74, 76, 78, 79 and the guide mechanism 103. Since the gear mechanism is not required, rattling due to backlash can be eliminated, and a sufficient rotation angle in the claw device 51 can be secured, and the sheet reversing operation can be highly accurate.

  In the reversing device of the sheet-fed printing press according to the second embodiment, the guide mechanism 103 is sandwiched between a pair of guide rollers 105 and 106 pivotally attached to the connecting shaft 77 via the support plate 104 and the guide rollers 105 and 106. A track 107 having a first guide surface 107a and a second guide surface 107b for guiding the movement is provided. Therefore, the movement of the connecting links 74, 76, 78, 79 is guided by the track 107 via the guide rollers 105, 106, so that the swinging of the second link mechanism 102 is restricted and a highly accurate sheet reversing operation is performed. Can be possible. Further, since the pair of guide rollers 105 and 106 move while holding the track 107, the rattling of the second link mechanism 102 can be suppressed with high accuracy.

  In each of the above-described embodiments, the claw driving device 52 includes the first link mechanism 61 and the second link mechanism 62, and the second link mechanism 62 is connected to the cam input shaft 65 and the claw shafts 54 and 55. The first link mechanism 61 is composed of the cam input shaft 65 and the cam follower. The guide mechanism 81 guides the connection shaft 77 of each of the connection links 76 and 78. You may comprise from the at least 4 connection link which connects 64, and the guide mechanism which guides the connection axis | shaft of each connection link.

  Further, in each of the above-described embodiments, the sheet reversing device 14 is disposed between the printing units 29 and 30, and the reversing intermediate cylinder 36, the reversing double cylinder intermediate cylinder 37, and the reversing cylinder 38 are configured. It is not a thing. Further, the inversion cylinder 38 may not be a double cylinder. Furthermore, although the printing apparatus 13 is configured by the four printing units 28, 29, 30, and 31, the present invention is not limited to this configuration, and there may be a plurality of units, or two or five or more.

  The sheet-fed printing machine reversing device and the sheet-fed printing machine according to the present invention are configured by a two-link mechanism that forms a claw driving device that rotates the claw device to reverse the front and back of the sheet. High accuracy is possible, and it can be applied to any sheet-fed printing press.

It is the schematic showing the 1st and 2nd link mechanism in the inversion apparatus of the sheet-fed printing press which concerns on Example 1 of this invention. FIG. 3 is a cross-sectional view illustrating a second link mechanism in the reversing device of the sheet-fed printing press according to the first exemplary embodiment. It is the schematic showing the nail | claw apparatus in the inversion apparatus of the sheet-fed printing press of Example 1. FIG. 1 is a schematic diagram illustrating a reversing device of a sheet-fed printing press according to Embodiment 1. FIG. It is the schematic showing the action | operation of the nail | claw apparatus in the inversion apparatus of the sheet-fed printing press of Example 1. FIG. It is the schematic showing the action | operation of the nail | claw apparatus in the inversion apparatus of the sheet-fed printing press of Example 1. FIG. It is the schematic showing the action | operation of the nail | claw apparatus in the inversion apparatus of the sheet-fed printing press of Example 1. FIG. It is the schematic showing the action | operation of the nail | claw apparatus in the inversion apparatus of the sheet-fed printing press of Example 1. FIG. It is the schematic showing the action | operation of the nail | claw apparatus in the inversion apparatus of the sheet-fed printing press of Example 1. FIG. FIG. 3 is a schematic diagram illustrating the operation of a reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. FIG. 3 is a schematic diagram illustrating the operation of a reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. FIG. 3 is a schematic diagram illustrating the operation of a reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. FIG. 3 is a schematic diagram illustrating the operation of a reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. FIG. 3 is a schematic diagram illustrating the operation of a reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. FIG. 3 is a schematic diagram illustrating the operation of a reversing cylinder in the reversing device of the sheet-fed printing press according to the first embodiment. 1 is a schematic diagram illustrating a sheet-fed printing press according to Embodiment 1. FIG. It is the schematic showing the 1st and 2nd link mechanism in the inversion apparatus of the sheet-fed printing press which concerns on Example 2 of this invention.

Explanation of symbols

11 Paper feeder (paper feeder)
12 Sheet conveying device (sheet conveying unit)
13 Printing device (printing unit)
14 Sheet reversing device (sheet reversing section)
15 Paper ejection device (paper ejection unit)
36 Reverse intermediate cylinder 37 Reverse double cylinder intermediate cylinder 38 Reverse cylinder 51 Claw device 52,101 Front claw drive device (claw drive device)
54 Outer claw shaft (front claw shaft)
55 Inner nail axis (back nail axis)
58 Front nail (claw member)
60 Back nails (nails)
61 1st link mechanism 62,102 2nd link mechanism 63 Turning cam 64 Cam follower 65 Cam input shaft 67 1st connection link 69 2nd connection link 70 3rd connection link 72 4th connection link 74 5th connection link 76 6th connection Link 78 Seventh connecting link 79 Eighth connecting link 81, 103 Guide mechanism 82, 105, 106 Guide roller 83a, 107a First guide surface 84a, 107b Second guide surface 85, 107 Track 83b, 84b Slot (track adjusting mechanism) )
88 Stopper (Roller pressing mechanism)
S Print sheet (sheet)

Claims (10)

A reversing cylinder rotatably disposed between a pair of printing units;
A claw device having a claw member for gripping a rear end portion of a sheet which is provided on the outer peripheral portion of the reversing drum and conveyed;
A claw drive device that rotates the claw device around a claw axis to reverse the front and back of the sheet, and
The claw driving device is
A first link mechanism capable of rotating a cam input shaft by operating a cam follower by a cam on the frame side;
A second link mechanism capable of rotating the claw device by rotating the cam input shaft;
Either one of the first link mechanism or the second link mechanism is
At least four connecting links connecting the cam input shaft and the cam follower or the claw shaft;
A guide mechanism for guiding at least one connecting portion of the connecting link;
A reversing device for a sheet-fed printing press.   2. The reversing device for a sheet-fed printing press according to claim 1, wherein the guide mechanism includes a guide roller pivotally attached to a connection portion of the connection link, and a track for guiding the movement of the guide roller. .   The reversing device for a sheet-fed printing press according to claim 2, wherein the track has a first guide surface and a second guide surface on which the guide roller rolls.   4. The reversing device for a sheet-fed printing press according to claim 3, further comprising a roller pressing mechanism that presses the guide roller against the first guide surface.   3. The reversing device for a sheet-fed printing press according to claim 2, wherein the track forms an S-shaped rail, and the guide roller is capable of rolling while sandwiching the rail.   The reversing device for a sheet-fed printing press according to any one of claims 2 to 5, wherein the guide roller is provided at an intermediate connecting portion of four connecting links connected in series.   The reversing device for a sheet-fed printing press according to any one of claims 2 to 6, further comprising a trajectory adjusting mechanism capable of adjusting a position of the trajectory.   The claw device is coaxially provided and has a front claw shaft having a cylindrical shape and a back claw shaft having a cylindrical shape, and a claw member connected to the front claw shaft and the back claw shaft connected to the front claw shaft. 8. The claw drive device according to claim 1, wherein the claw driving device rotates the front claw and the back claw about the front claw shaft and the back claw shaft. A reversing device for a sheet-fed printing press according to one.   The claw driving device can turn and release the sheet by rotating the front and back claws independently, and can rotate the front and back claws integrally. 9. The reversing device for a sheet-fed printing press according to claim 8, wherein the front and back of the ordered sheet can be reversed. A paper feed unit that sucks and feeds the sheets stacked on the paper feed table;
A printing unit having a plurality of printing units that perform printing by transferring the ink supplied from the inking device to the rubber cylinder through the plate cylinder to the sheet; and
A reversing device that is provided between the plurality of printing units and that reverses the front and back by holding the rear end of the sheet;
A sheet-fed printing press comprising: a sheet discharge unit that stacks and discharges sheets printed by the printing unit on a sheet discharge table;
The reversing device is
A rotatable reversing cylinder,
A claw device having a claw member provided on the outer periphery of the reversing drum and holding the rear end of the sheet;
A claw drive device for rotating the claw device with a claw shaft as a fulcrum
The claw driving device is
A first link mechanism capable of rotating a cam input shaft by operating a cam follower by a cam on the frame side;
A second link mechanism capable of rotating the claw device by rotating the cam input shaft;
Either one of the first link mechanism or the second link mechanism is
At least four connecting links connecting the cam input shaft and the cam follower or the claw shaft;
A guide mechanism for guiding at least one connecting portion of the connecting link;
A sheet-fed printing machine characterized by that.

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