JP2013241277A - Sheet conveyance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet conveyance device for conveying a sheet, which enables the size of the sheet to be changed with ease.SOLUTION: A sheet conveyance device 1 for conveying a sheet includes: a first conveyance part 39 which includes a first holder 39a for conveying the sheet by holding an end of the sheet; a second conveyance part 33 which includes second holders 33a-33c for conveying the sheet by holding the end of the sheet conveyed by the first conveyance part 39; a third conveyance part 31b which is swingably supported between the first and second conveyance parts 39 and 33, and which includes a third holder for holding the other end of the sheet having the one end held by the first holder 39a and transferring the other end of the sheet to the holders 33a-33c of the second conveyance part 33; and a control part which controls a swing motion of the third conveyance part 31b on the basis of the conveyance-direction length of the sheet.

Description

  The present invention relates to a sheet conveying apparatus that conveys a sheet.

  As an example of a sheet conveying apparatus that conveys a sheet, there is a sheet conveying apparatus in a sheet reversing unit provided in a sheet-fed rotary printing press with a reversing mechanism capable of performing printing on one side and both sides of a sheet (for example, Patent Document 1). reference). The reversing unit is disposed between adjacent printing units and can selectively reverse a sheet, thereby enabling single-sided printing and double-sided printing on the sheet.

  In this sheet-fed rotary printing press with a reversing mechanism of Patent Document 1, the reversing unit includes a transfer cylinder (number 17 in FIG. 4 of Patent Document 1) and an impression cylinder (number 16 in FIG. 4 of Patent Document 1). When performing double-sided printing, the rear end of the sheet conveyed while holding the leading end of the sheet by the transfer cylinder is grasped by the impression cylinder and conveyed with the trailing end of the sheet as the leading end. The front and back can be reversed.

Japanese Patent Publication No. 03-080108

  However, in the sheet-fed rotary printing press with a reversing mechanism disclosed in Patent Document 1, when changing the size of the sheet, before the printing apparatus is operated, the gear that drives the impression cylinder is cut off, and the gripper nail device of the impression cylinder And the rear end of the sheet held by the transfer cylinder are opposed to each other after changing the phase of the impression cylinder with respect to the transfer cylinder, and the work of refastening the gear is performed. There was a problem.

  The present invention has been made to solve such a problem, and an object of the present invention is to propose a sheet conveying apparatus that can easily cope with a change in sheet size.

  In order to solve this problem, in the invention according to claim 1, in the sheet conveying apparatus that conveys a sheet, a first conveying unit having a first holding device that conveys the sheet while holding an end of the sheet, and the first conveying unit A second conveying unit having a second holding device that holds and conveys an end of the sheet conveyed by the first conveying unit, and is swingably supported between the first conveying unit and the second conveying unit. A third holding device that holds the other end of the sheet held by the first holding device and delivers the other end of the sheet to the second holding device of the second transport unit; A third conveyance unit and a control unit that controls the swinging operation of the third conveyance unit based on the length of the sheet in the conveyance direction are provided.

  In the invention of claim 2, the control unit makes the speed of the third holding device the same as the speed of the sheet conveyed by the first conveying unit when receiving the sheet from the first conveying unit, When delivering the sheet to the second conveying unit, the second conveying unit is controlled to have the same speed as the second holding device, and after receiving the sheet from the first conveying unit, the second conveying unit The swing speed of the third conveying unit until the sheet is delivered to the conveying unit is controlled based on the length of the sheet in the conveying direction.

  The invention according to claim 3 further comprises an adjustment unit that adjusts a swing speed of the third transport unit, and the adjustment unit includes a differential gear mechanism provided in a drive system of the third transport unit and the differential gear. An adjustment motor that drives the mechanism to adjust the swing speed of the third transport unit, and the control unit controls the adjustment motor.

  According to a fourth aspect of the present invention, there is provided a swinging motor that swings the third transport unit independently of the first transporting unit and the second transporting unit, and the control unit controls the swinging motor. To.

  According to the invention of claim 1, even when the sheet size is changed, the swinging operation of the third transport unit can be controlled based on the changed transport direction length of the sheet. The speed of the swinging motion of the third transport unit can be changed in accordance with the timing at which the changed end of the sheet arrives, and the sheet can be reliably held by the third transport unit.

It is a side view which shows the whole structure of a digital printing apparatus. It is a side view which shows the structure of an inversion swing apparatus. It is a side view which shows the swing mechanism of an inversion swing apparatus. It is sectional drawing which shows a state when the swing mechanism of an inversion swing apparatus is expand | deployed. It is a block diagram which shows the structure of the control system of a digital printing apparatus. It is a side view which shows the printing process (1) in a digital printing apparatus. It is a side view which shows the printing process (2) in a digital printing apparatus. It is a side view which shows the printing process (3) in a digital printing apparatus. It is a side view which shows the printing process (4) in a digital printing apparatus. It is a side view which shows the printing process (5) in a digital printing apparatus. It is sectional drawing which shows a state when the swing mechanism of the inversion swing apparatus in other embodiment is expand | deployed.

  Next, an embodiment of the present invention will be described with reference to the drawings.

<Configuration of digital printing device>
As shown in FIG. 1, a digital printing apparatus 1 as a sheet conveying apparatus includes a paper feeding device 2 as a supply unit, a digital printing unit 3 as a processing unit, and a paper discharge device 4 as a discharge unit.

  The paper feeding device 2 is provided with a stacking table 21 on which a plurality of sheets S1 are stacked, and a soccer device 23 that conveys the uppermost sheet S1 of the stacking table 21 to the feeder board FB. The soccer device 23 includes a first suction 23 a and a second suction 23 b, and the first suction 23 a and the second suction 23 b are connected to the negative pressure source 25 through a continuous supply valve 26 and an intermittent supply valve 27.

  The continuous supply valve 26 and the intermittent supply valve 27 both connect and disconnect the suction from the negative pressure source 25 of the first suction 23a and the second suction 23b, but the timings for connecting and disconnecting the suction are different as will be described later. Yes.

  On the front end side in the sheet conveying direction of the feeder board FB, it is supported by the frame 3a of the digital printing unit 3 so as to be swingable, and holds the front end (the end on the holding side) as one end of the sheet S1. A swing device 31f provided with a gripper device is provided. A paper feed side transfer drum 32 is disposed opposite to the swing device 31f, and the paper feed side transfer drum 32 is rotatably supported by the frame 3a.

  The feeding side transfer cylinder 32 is provided with a gripping claw device 32a that holds the leading end of the sheet S1 delivered by the gripping claw device of the swing device 31f. In the digital printing unit 3, the swing device 31f and the sheet feeding side transfer cylinder 32 constitute an upstream sheet conveying device.

  A printing cylinder 33 as a second conveyance unit is disposed in contact with the sheet feeding-side transfer cylinder 32 downstream of the swing device 31f in the sheet conveyance direction, and the printing cylinder 33 is rotatably supported by the frame 3a. . The printing cylinder 33 is a printing cylinder holding claw device 33a, 33b, 33c as a second holding device that receives and holds the leading end of the sheet S1 from the holding claw device 32a of the feeding side transfer cylinder 32, and this printing cylinder holding claw device. 33a, 33b, 33c, and support surfaces 33d, 33e, 33f that support the sheet S1, and in this embodiment, three sets of the printing cylinder gripping nail device and the support surface are provided. Further, the diameter of the cylinder is three times that of the sheet feeding side transfer cylinder 32. Here, the printing cylinder holding claw devices 33a, 33b, and 33c that hold the sheet S1 are provided in a state in which the phases are shifted from each other by 120 degrees in the circumferential direction.

  A plurality of suction holes are formed in the support surfaces 33d, 33e, and 33f of the printing cylinder 33, and the plurality of suction holes are connected to a negative pressure source. An ink jet nozzle portion 34 is disposed on the downstream side of the printing cylinder 33 with respect to the sheet feeding side transfer cylinder 32 in the sheet conveying direction so as to face the peripheral surface of the printing cylinder 33.

  In the inkjet nozzle section 34, a plurality of inkjet nozzle heads 34a to 34d in which inks of different colors are set are arranged side by side along the circumferential surface of the printing cylinder 33 in the sheet conveying direction. Oriented. The inkjet nozzle heads 34a to 34d are arranged close to the printing cylinder 33 so that the gap between the printing nozzle 33 and the sheet S1 adsorbed on the entire surface of the supporting surface 33d, 33e, 33f is slightly spaced. The printing cylinder 33 and the inkjet nozzle unit 34 constitute a sheet printing apparatus.

  An ink printed on the sheet S1 by irradiating the sheet S1 with light such as infrared rays or ultraviolet rays is disposed on the downstream side of the printing cylinder 33 in the sheet conveyance direction with respect to the inkjet nozzle portion 34, and is irradiated with light such as infrared rays or ultraviolet rays. An ink drying lamp 35 is provided as a drying device for drying. Here, the term “drying” includes evaporation of moisture of the ink by applying thermal energy and curing of the ink, which can be called solidification.

  A first paper discharge side transfer cylinder 36 is disposed in contact with the printing cylinder 33 on the downstream side in the sheet conveying direction from the ink jet nozzle portion 34, and the first paper discharge side transfer cylinder 36 is rotatable to the frame 3a. It is supported by. The first paper discharge side transfer cylinder 36 is provided with a gripping claw device 36a that receives and holds the leading end of the sheet S1 conveyed by the printing cylinder 33 from the printing cylinder gripping claw devices 33a, 33b, and 33c.

  A second paper discharge side transfer cylinder 37 is in contact with the first paper discharge side transfer cylinder 36 on the downstream side of the first paper discharge side transfer cylinder 36 in contact with the printing cylinder 33 in the sheet conveying direction. The second paper discharge side transfer cylinder 37 is rotatably supported by the frame 3a. The second paper discharge side transfer drum 37 is provided with a gripping claw device 37a for receiving and holding the leading edge of the sheet S1 conveyed by the first paper discharge side transfer drum 36.

  A paper take-up cylinder 38 is disposed in contact with the first paper discharge-side transfer cylinder 37 on the downstream side of the second paper discharge-side transfer cylinder 37 with respect to the first paper discharge-side transfer cylinder 36. 3a is rotatably supported. The paper take-up cylinder 38 is provided with a gripping claw device 38a that receives and holds the leading end of the sheet S1 conveyed by the second paper discharge side transfer cylinder 37.

  Below the paper drum 38, a belt-conveyor-like delivery belt 40 that conveys the sheet S1 is disposed. On the leading end side of the delivery belt 40 in the sheet conveyance direction, a stacking base 41 on which the sheet S1 subjected to digital printing processing by the digital printing unit 3 is stacked is provided. The paper take-up cylinder 38, the delivery belt 40, and the stacking base 41 constitute the paper discharge device 4, and the path of the sheet S1 conveyed by the paper take-up cylinder 38 and the delivery belt 40 constitutes the sheet discharge path.

  A pre-reverse double cylinder 39 as a first conveyance unit is disposed in contact with the downstream side of the second paper discharge side transfer cylinder 37 and the paper take-up cylinder 38 in the sheet conveyance direction. A barrel 39 is rotatably supported by the frame 3a. The pre-inversion double cylinder 39 is a double cylinder having a diameter twice that of the second paper discharge side transfer cylinder 37, and receives and holds the leading end of the sheet S1 conveyed by the second paper discharge side transfer cylinder 37. A gripper claw device 39a is provided as a first holding device.

  Here, the pre-reverse double cylinder 39 is connected to a drive motor 383 (FIG. 5) that is independently driven independently from the printing cylinder 33, the second discharge side transfer cylinder 37, the reverse swing device 31b, and the like. Yes.

  As shown in FIG. 2, as shown in FIG. 2, the rear end (the other end portion of the sheet S <b> 1) is located downstream of the contact portion of the pre-reverse double cylinder 39 with the second discharge-side transfer cylinder 37. A reversing swing device 31b as a third transport unit that receives and holds the bottom end) is disposed to face each other. The reversing swing device 31b also constitutes a reversing unit that reverses the front and back of the sheet S1.

  The reverse swing device 31b includes a reverse swing shaft 31j that is rotatably supported by the frame 3a, a swing arm 202 fixed to the reverse swing shaft 31j, and a claw base 205 fixed to the tip of the swing arm 202. It has.

  The reverse swing device 31b includes a rotation shaft 203a that is rotatably supported at the tip of the swing arm 202, and a swing claw 203 that is fixed to the rotation shaft 203a and faces the claw base 205. The swing claw 203 opens and closes the claw base 205 by the rotation of the rotation shaft 203a. When the swing claw 203 is closed, the sheet S1 is sandwiched and held between the claw base 205 and the swing claw 203. When 203 is opened, the holding of the sheet S1 is released. The swing claw 203 and the claw base 205 constitute a holding claw device 31bt as a third holding device.

  The reversing swing device 31b is located downstream of the printing cylinder 33 in the rotational direction of the printing cylinder 33 with respect to the first discharge-side transfer cylinder 36 and more than the printing cylinder with respect to the feeding cylinder 32. It is disposed opposite to the printing cylinder 33 on the upstream side in the rotational direction of 33. The reversing swing device 31b includes a receiving position (FIG. 1) indicated by a broken line that receives the rear end of the sheet S1 conveyed by the pre-reversing double cylinder 39, and printing cylinder holding claw devices 33a and 33b of the printing cylinder 33. , 33c is supported by the frame 3a so as to be swingable between a delivery position (FIG. 1) indicated by a solid line that delivers the rear end of the sheet S1. The path of the sheet S1 conveyed by the first sheet discharge side transfer cylinder 36, the second sheet discharge side transfer cylinder 37, the pre-reverse double cylinder 39, and the reverse swing device 31b constitutes a sheet reverse path.

  The gripping claw device 37a of the second paper discharge side transfer cylinder 37 can selectively deliver the sheet S1 between the gripping claw device 38a of the paper take-up cylinder 38 and the gripping claw device 39a of the pre-reverse double cylinder 39. Driven possible. Further, the gripping claw device 38a of the paper take-up cylinder 38 is driven so as to be able to selectively receive the leading end of the sheet S1 conveyed by the second paper discharge side transfer cylinder 37. The gripping claw devices 37a, 38a A conveyance path switching unit 82 (FIG. 5) is configured to switch the conveyance destination of the sheet S1 to the paper discharge device 4 or the reverse swing device 31b, that is, to switch the conveyance path of the sheet S1 to the sheet discharge route or the sheet reverse route.

<Swing mechanism of reverse swing device>
Next, the swing mechanism 300 of the reverse swing device 31b in the digital printing unit 3 will be described.

  As shown in FIGS. 3 and 4, the swing mechanism 300 is a mechanism for swinging the reversing swing device 31b, and the camshaft 301 rotates via bearings 302 and 306 between the subframe 3as1 and the subframe 3as2 of this machine. A cam 304 and a sub cam 305 are fixed to the cam shaft 301. A gear 303 connected to a gear 290 rotated by a drive source of this machine and a harmonic drive (registered trademark) 361 as a differential gear mechanism is mounted on the camshaft 301. As shown in FIG. 3, the cam surfaces of the cam 304 and the sub cam 305 are formed with a large difference in height between the large diameter portion and the small diameter portion.

  A subframe 3aS3 is provided on the side of the frame 3a, and a lever shaft 311 is rotatably supported between the frame 3a and the subframe 3aS3. That is, one end of the lever shaft 311 is rotatably supported via the bearing 335 of the sub-frame 3aS3, and the other end of the lever shaft 311 is rotatable by the bearing 337 held by the bearing holding portion 338 of the frame 3a. It is supported by.

  A swing shaft 31j of the reversing swing device 31b is rotatably supported on the frame 3a via a bearing 31g held by a bearing holding portion 328, and a pinion gear 31p is provided at the tip of the swing shaft 31j. Is fixed.

  One end of the first lever 313 is fixed to the lever shaft 311 by bolts 314. A pin 317a is provided at the other end of the first lever 313, and a cam follower 317 is rotatably supported by the pin 317a. The first lever 313 is disposed so that the cam follower 317 is in contact with the cam 304 that is attached to the cam shaft 301.

  One end of the second lever 325 is fixed to the lever shaft 311 by bolts 326. A segment gear 327 that meshes with the pinion gear 31p is fixed to the other end of the second lever 325. As shown in FIG. 3, the segment gear 327 is formed with a large radius R1, and the pinion gear 31p is formed with a radius R2 that is much smaller than the radius R1 of the segment gear 327. Here, the pinion gear 31p and the segment gear 327 constitute a rack and pinion mechanism.

  Further, a third lever 331 is rotatably supported on the lever shaft 311 via a bearing 336. A pin 332a is attached to one end of the third lever 331, and a cam follower 332 is rotatably attached to the pin 332a via a bearing 333. The third lever 331 is disposed so that the cam follower 332 is in contact with the sub cam 305 mounted on the cam shaft 301. A holder 321 provided with pins 319a and 319b on both side surfaces is rotatably supported at the other end of the third lever 331. The holder 321 is provided with a through hole 321a in a direction orthogonal to the axes of the pins 319a and 319b.

  Reference numeral 322 denotes a connecting member that connects the first lever 313 and the third lever 331, and the head portion 315 of the connecting member 322 is rotatably supported by a pin 316 provided at the other end of the first lever 313. Yes. The head portion 315 is provided with a shaft portion 322 c formed with a screw. The shaft portion 322 c is inserted into the through hole 321 a of the holder 321 of the third lever 331.

  A nut 316a is screwed into a screw of the shaft portion 322c, and a spring receiving member 322b inserted through the shaft portion 322c and supported movably with respect to the shaft portion 322c is interposed between the nut 316a and the holder 321 of the third lever 331. It is arranged. A spring 322a as an urging means is interposed between the spring receiving member 322b and the nut 316, and the other end of the first lever 313 and the other end of the third lever 331 are urged away from each other. doing. The spring 322 a presses the cam follower 317 of the first lever 313 against the cam 304 and also presses the cam follower 332 of the third lever 331 against the sub cam 305. The nut 316a functions as an urging force adjusting means for adjusting the spring force of the spring 322a.

  The cam 304 and the sub cam 305 are formed with respective cam surfaces so that the relative positional relationship between the first lever 313 and the third lever 331 hardly changes. That is, as shown in FIG. 3, when the cam follower 317 of the first lever 313 is in contact with the small diameter portion of the cam 304, the cam follower 332 of the third lever 331 is in contact with the large diameter portion of the sub cam 305, When the cam follower 317 of the first lever 313 is in contact with the large diameter portion of the cam 304, the cam follower 332 of the third lever 331 is in contact with the small diameter portion of the sub cam 305.

  Here, the cam 304, the sub cam 305, the first lever 313 provided with the cam follower 317, the third lever 331 provided with the cam follower 332, and the connecting member 322 provided with the spring 322a as the urging means are conjugated cams (positive cams). Configure.

  In addition to this configuration, the swing mechanism 300 includes an adjustment unit that adjusts the swing speed of the reversing swing device 31b in the reversing swing drive system that transmits the drive of the drive source of the present apparatus to the reversing swing device 31b. This adjustment unit includes a harmonic drive (registered trademark) 361 and an adjustment motor 363 provided between a gear 290 driven by a drive source of this machine and a gear 303 attached to the camshaft 301. .

  The harmonic drive 361 includes an input shaft called a wave generator, an output shaft called a circular spline, and a control shaft called a flex spline. The input shaft is drivingly connected to the gear 290, and the output shaft is driven to the gear 303. The control shaft is connected to the adjustment motor 363 by driving. In the harmonic drive 361, when the control shaft is stopped, the output shaft rotates at the same speed as the input shaft, and the output shaft rotates with a speed difference with respect to the rotational speed of the input shaft by changing the speed of the control shaft. This is a reduction mechanism that can adjust the reduction ratio according to the speed of the control shaft, that is, the rotation speed of the adjustment motor 363.

<Configuration of control system of digital printing device>
As shown in FIG. 3, the digital printing apparatus 1 includes a control device 81 as a control unit having a CPU (Central processing Unit) configuration for overall control. The control device 81 allows the operator to select either a single-sided printing mode in which digital printing processing is performed on only one side of the sheet S1, or a double-sided printing mode in which digital printing processing is performed on both the front and back surfaces of the sheet S1. The switch 80, the continuous supply valve 26 and the intermittent supply valve 27 of the paper feed unit 2, the inkjet nozzle heads 34a to 34d of the inkjet nozzle unit 34, the conveyance path switching means 82, the adjustment motor 363, the drive motor 383, and the sheet size detection unit 93. , And a phase detection sensor 94 composed of a rotary encoder as a phase detection unit for detecting the phase of the printing cylinder 33 is connected. Here, the sheet size detection unit 93 is a sheet size input device in which the length of the sheet S1 in the conveyance direction is input by an operator, or a sheet size detector that automatically detects the length of the sheet S1 in the conveyance direction. Say.

<Printing operation of digital printing device>
The printing operation of the digital printing apparatus 1 configured as described above will be described separately when the single-sided printing mode is selected and when the double-sided printing mode is selected.

  As shown in FIG. 1, when the single-sided printing mode is selected by the operator's operation of the printing mode selection switch 80, the control device 81 activates the continuous supply valve 26, whereby the first suction 23a and the second suction are performed. 23b adsorbs the sheet S1 on the loading table 21 and conveys it to the feeder board FB.

  The continuous supply valve 26 feeds the same number of sheets S1 as the number of the printing cylinder holding nail devices 33a, 33b, 33c provided in the printing cylinder 33 during one rotation of the printing cylinder 33, in other words, the printing cylinder. The continuous supply valve 26 is “opened” at each timing (first period) at which the gripping claw devices 33a, 33b, 33c of the feed 33 and the gripping claw device 32a of the sheet feeding side transfer cylinder 32 face each other. The controller 81 controls the suction of the second suction 23b from the negative pressure source 25. In this way, supplying the sheet S1 so that all the printing cylinder holding claw devices 33a, 33b, and 33c of the printing cylinder 33 hold the sheet S1 is called continuous feeding, and the continuous supply valve 26 in continuous feeding is used. The opening / closing cycle is referred to as a first cycle. Thereby, the soccer device 23 conveys the sheet S1 to the feeder board FB in the first cycle.

  After the leading end of the sheet S1 conveyed by the feeder board FB is held by the gripping claw device of the swing device 31f, the sheet S1 is conveyed toward the paper supply side transfer cylinder 32 by the swing of the swing device 31f, and the paper supply side transfer is performed. The leading end of the sheet S1 is replaced by the holding claw device 32a of the trunk 32.

  The sheet S1 conveyed along with the rotation of the sheet feeding side transfer cylinder 32 is transferred from the gripping claw device 32a of the sheet feeding side transfer cylinder 32 to the printing cylinder holding claw device 33a to 33a of the printing cylinder 33 at the contact portion with the printing cylinder 33. After the tip is replaced by any of 33c, it is conveyed along with the rotation of the printing cylinder 33. At this time, the entire surface of the sheet S1 is adsorbed to the support surfaces 33d to 33f of the printing cylinder 33 through the plurality of suction holes in the printing cylinder 33 and is in close contact with the support surfaces 33d to 33f.

  Digital printing processing is performed on the surface of the sheet S <b> 1 conveyed by the printing cylinder 33 by ejecting fine droplets of ink from the inkjet nozzle heads 34 a to 34 d of the inkjet nozzle portion 34. Since the sheet S1 is in close contact with the support surfaces 33d to 33e of the printing cylinder 33, the sheet S1 is conveyed in a state in which a minute distance between the inkjet nozzle heads 34a to 34d is maintained. By maintaining this minute interval, the ejected ink can be landed on the sheet S1 with high accuracy, and high-quality printing can be performed.

  The sheet S1 that has been printed by the inkjet nozzle unit 34 passes between the printing cylinder 33 and the ink drying lamp 35, and is irradiated with light from the ink drying lamp 35, whereby the ink on the sheet S1 is dried. . Thereafter, the sheet S1 is conveyed to the first paper discharge side transfer cylinder 36.

  Since the sheet S1 is in close contact with the support surfaces 33d, 33e, and 33f of the printing cylinder 33, the entire surface of the sheet S1 is uniformly irradiated with light from the ink drying lamp 35, and the ink is dried without unevenness.

  As shown in FIG. 6, in the contact portion between the printing cylinder 33 and the first paper discharge side transfer cylinder 36, the print cylinder holding nail devices 33 a to 33 c of the printing cylinder 33 hold the first paper discharge side transfer cylinder 36. The leading end of the sheet S1 is replaced with the nail device 36a. Thereafter, as shown in FIG. 7, the sheet S <b> 1 held by the gripping claw device 36 a of the first paper discharge side transfer drum 36 is transferred to the first paper discharge side transfer drum 36 and the second paper discharge side transfer drum 37. At the contact portion, the gripper claw device 36a of the first paper discharge side transfer drum 36 is replaced with the gripper claw device 37a of the second paper discharge side transfer drum 37.

  In the single-sided printing mode, the control device 81 controls the transport path switching unit 82 so that all the sheets S1 are transferred from the second paper discharge side transfer cylinder 37 to the paper take-up cylinder 38. That is, in a phase where the leading end of the sheet S1 is positioned at the contact portion between the second discharge side transfer cylinder 37 and the paper take-up cylinder 38, the gripping claw device 37a of the second discharge side transfer cylinder 37 moves the sheet S1. The holding of the leading edge is released, and the gripping claw device 38a of the paper drum 38 holds and holds the leading edge of the sheet S1. Thus, the sheet S1 printed on one side is transferred from the second discharge side transfer cylinder 37 to the paper take-up cylinder 38 and conveyed.

  The sheet S1 that has been replaced by the gripper device 38a of the paper drum 38 is released from being held by the gripper device 38a at the timing when the gripper device 38a of the paper drum 38 is positioned above the delivery belt 40, and delivered. It is placed on the belt 40.

  The sheet S1 placed on the delivery belt 40 is conveyed along with the travel of the delivery belt 40, and the sheet S1 subjected to digital printing processing on the surface is discharged onto the stacking table 41 of the paper discharge device 4.

  On the other hand, when the duplex printing mode is selected by the operator's operation of the printing mode selection switch 80, the control device 81 (FIG. 5) controls the drive motor 383 so that the pre-reverse double cylinder 39 rotates in synchronization with the other cylinders. Drive. In this state, the control device 81 operates the intermittent supply valve 27, thereby sucking the sheet S1 of the first suction 23a and the second suction 23b and placing it on the feeder board FB.

  The intermittent supply valve 27 supplies the sheet S1 at every other sheet timing with respect to the continuous supply timing (second period that is twice as long as the first period), in other words, in the printing cylinder 33. At the timing when each gripper device 33a, 33b, 33c and the gripper device 32a of the feed-side transfer cylinder 32 face each other, the valves become “open”, “closed”, “open”, “closed”,. Control is performed by the control device 81 as described above. This is twice as long as the continuous feeding cycle. In this way, feeding the sheet S1 so that the printing cylinder holding claw devices 33a, 33b, 33c of the printing cylinder 33 hold the sheet S1 every other time is called intermittent feeding, and the intermittent supply valve in intermittent feeding The open / close cycle of 27 is referred to as a second cycle. Accordingly, the soccer device 23 intermittently sucks every other sheet S1 in the second period and conveys it to the feeder board FB.

  The sheet S1 sent to the feeder board FB by the soccer device 23 is delivered to the printing cylinder 33 via the swing device 31f and the sheet feeding side transfer cylinder 32 as in the single-sided printing mode, but the sheet S1 is intermittently fed. Since the paper is fed at the paper timing, the printing cylinder holding claw devices 33a to 33c of the printing cylinder 33 receive every other new sheet S1 conveyed from the sheet feeding side transfer cylinder 32.

  Thereafter, the sheet S1 is conveyed to the inkjet nozzle portion 34, and printing for the surface is performed on one surface (front surface) thereof. Here, based on the detection signal from the phase detection sensor 94, the control device 81 performs printing on a new sheet S1 held every other one of the printing cylinder holding nail devices 33a to 33c of the printing cylinder 33. The inkjet nozzle heads 34a to 34d of the inkjet nozzle portion 34 are controlled so that printing is not performed on the support surfaces 33d to 33f of the printing cylinder holding claw devices 33a to 33c that do not hold the sheet S1.

  In the double-sided printing mode, the control device 81 does not transfer the sheet S1 printed on the surface by the ink jet nozzle unit 34 from the second paper discharge side transfer cylinder 37 to the paper cylinder 38, The conveyance path switching means 82 is controlled so as to be delivered to the pre-reverse double cylinder 39.

  That is, in the case of the duplex printing mode, the sheet S1 that has been printed on the front surface but not digitally printed on the other surface (back surface) is the second discharge side transfer drum 37 and the paper drum 38. In the phase positioned at the contact portion, the claw of the gripping claw device 37a of the second paper discharge side transfer cylinder 37 is kept open, that is, the state in which the leading edge of the sheet S1 is held is maintained. At the same time, the claw of the gripping claw device 38a of the paper drum 38 is kept open without being closed.

  As a result, the sheet S1 printed only on the front surface is conveyed from the second paper discharge side transfer cylinder 37 to the paper take-up cylinder 38 without being replaced by the pre-inversion double cylinder 39. That is, the nail of the pre-reverse double cylinder 39 gripping claw device 39a is closed at the contact portion between the second discharge side transfer cylinder 37 and the pre-reverse double cylinder 39 to hold the leading edge of the sheet S1, and the second discharge The nail of the gripping claw device 37a of the paper-side transfer cylinder 37 is opened to release the holding of the leading edge of the sheet S1, and as shown in FIG. The holding claw device 39a of the trunk 39 holds the leading end of the sheet S1.

  As shown in FIG. 9, the sheet S1 conveyed along with the rotation of the pre-reversing double cylinder 39 swings the reverse swing device 31b from the delivery position indicated by the solid line to the reception position indicated by the broken line, and the rear end of the sheet S1. At the same time as holding the (paper end side end) by the reverse gripping claw device 31bt of the reversing swing device 31b, the holding of the pre-reverse double cylinder 39 by the gripping claw device 39a with respect to the leading edge of the sheet S1 is released. As a result, the rear end of the sheet S1 is replaced from the pre-reverse double cylinder 39 to the reverse swing device 31b.

  Thereafter, as shown in FIG. 9, the reverse swing device 31b swings from the receiving position indicated by the broken line to the delivery position indicated by the solid line, whereby the sheet S1 is conveyed toward the printing cylinder 33 with the trailing edge at the top, The rear end of the sheet S1 is replaced by any of the gripper claw devices 33a to 33c of the printing cylinder 33 from the gripper claw device 31bt of the reverse swing device 31b.

  As shown in FIG. 3, the swing angle (swing angle) θ2 between the receiving position and the delivery position of the reversing swing device 31b is large. In order to obtain this large swing angle θ2, in this embodiment, a conjugate cam and A swing mechanism 300 combined with a rack and pinion mechanism is used. That is, as shown in FIG. 3 and FIG. 4, in the swing mechanism 300, when the gear 303 is rotated via the gear 290 and the harmonic drive 361 that are rotated by the drive source of this machine, As a result, the cam 304 and the sub cam 305 rotate.

  The cam follower 317 of the first lever 313 is in contact with the cam surface of the cam 304, and at the same time, the cam follower 332 of the third lever 331 is in contact with the cam surface of the sub cam 305. The first lever 313 swings according to the shape of the cam surface of the cam 304 via the cam follower 317. The lever shaft 311 is rotated by the swing of the first lever 313, and the second lever 325 fixed to the lever shaft 311 swings at the swing angle (swing angle) θ <b> 1 with the segment gear 327.

  While the first lever 313 is swinging, the third lever 331 swings according to the shape of the cam surface of the sub cam 305 via the cam follower 332. The cam follower 317 of the first lever 313 and the cam follower 332 of the third lever 331 are pressed against the cam surfaces of the cam 304 and the sub cam 305 by a spring 322a. That is, the spring receiving member 322b presses the holder 321 of the third lever 331 by the spring 322a, the third lever 331 is urged in the direction in which the cam follower 332 presses the cam surface of the sub cam 305, and the nut is further pressed by the spring 322a. The first lever 313 is biased in a direction in which the cam follower 317 presses the cam surface of the cam 304 through the connecting member 322 in which the screw 316a is screwed.

  At this time, since the relative positional relationship between the first lever 313 and the third lever 331 is hardly changed by the cam 304 and the sub cam 305, the biasing force by the spring 322a can be made almost constant, and the height difference is large. The pressing force of the cam follower 317 of the first lever 313 and the cam follower 332 of the third lever 331 with respect to the cam surfaces of the cam 304 and the sub cam 305 can always be kept constant. Therefore, the segment gear 327 can be reliably swung at a large swing angle (swing angle) θ1 without causing cam jump.

  When the segment gear 327 of the second lever 325 swings at a swing angle (swing angle) θ1, the swing shaft 31j rotates via the pinion gear 31p, and thereby the reverse swing device 31b swings.

  In this case, in the reverse swing device 31b, the segment gear 327 of the second lever 325 formed with a large radius R1 is meshed with the pinion gear 31p with a radius R2 that is much smaller than the rotation radius R1 of the second lever 325. Therefore, the gripper device 31bt can be swung with a swing angle (swing angle) θ2 that is larger than, for example, four times the swing angle (swing angle) θ1 of the second lever 325.

  Thereby, even when the distance between the pre-reversal double cylinder 39 and the printing cylinder 33 is wide, that is, when the distance from the pre-reverse double cylinder 39 to the print cylinder 33 is long, a large difference in height is caused by the conjugate cam of the swing mechanism 300. A large swing angle (swing angle) θ1 of the segment gear 327 of the second lever 325 can be obtained without using the cam 304, and further, the segment gear 327 of the second lever 325 having a large radius R1 can be obtained. Since the rack and pinion mechanism in combination with the pinion gear 31p having a small radius R2 can convert the large swing angle (swing angle) θ1 of the segment gear 327 into a larger swing angle (swing angle) θ2. The conveying distance of the sheet S1 by the gripper device 31bt is increased, and thus the sheet is transferred from the pre-reverse double cylinder 39 via the reverse swing device 31b. It can be passed first to the rear end to the printing cylinder 33.

  Here, the printing cylinder holding claw devices 33a to 33c of the printing cylinder 33 hold every other new sheet S1 conveyed from the sheet feeding side transfer cylinder 32, but the reverse swing device 31b is a new one. Positioned at the delivery position at a timing facing the printing cylinder holding claw devices 33a to 33c not holding the sheet S1, and the rear end of the sheet S1 from the holding claw device 31bt of the reverse swing device 31b is printed to the printing cylinder holding claw devices 33a to 33c. Hand over to. As a result, the new sheet S1 delivered from the feed-side transfer cylinder 32 and the sheet S1 delivered from the gripping-nail apparatus 31bt of the reverse swing device 31b to the printing cylinder holding claw devices 33a to 33c of the printing cylinder 33. Are alternately held and conveyed to the inkjet nozzle section 34.

  At this time, the sheet S1 delivered from the gripping claw device 31bt of the reversing swing device 31b has a surface that has already been subjected to digital printing processing by the inkjet nozzle portion 34 (surface that has been subjected to digital printing processing) 33d support surface 33d of the printing cylinder 33. , 33e, 33f in a state where the back surface of the sheet S1 (the surface not yet processed by digital printing) is exposed, and the rear end of the sheet S1 is held by the printing cylinder holding nail devices 33a to 33c of the printing cylinder 33. In other words, the sheet S <b> 1 is reversed and conveyed, and the inkjet nozzle unit 34 performs digital printing on the back surface of the sheet S <b> 1.

  Here, the reverse side sheet S1 delivered from the gripping claw device 31bt of the reversing swing device 31b is printed on the back side and held every other gripping claw devices 33a to 33c of the printing cylinder 33. Each inkjet nozzle head 34a-34d of the inkjet nozzle part 34 is controlled so that printing for the surface is performed on the new sheet S1. As a result, the inkjet nozzle heads 34a to 34d alternately perform printing for the front surface and printing for the back surface corresponding to the new sheet S1 held alternately on the printing cylinder 33 and the sheet S1 in the reverse state. Become.

  Thereafter, the sheet S1 printed on the back side is printed on the first discharge side transfer drum 36, the second discharge side transfer drum 37, and the paper drum 38 in the same manner as in the single-sided printing mode. Then, the paper is discharged from the delivery belt 40 to the loading table 41 of the paper discharge device 4.

  Next, the operation of the harmonic drive 361 provided in the swing mechanism 300 will be described. When the operator selects the duplex printing mode via the printing mode selection switch 80, the control device 81 rotates the adjustment motor 363 based on, for example, the conveyance direction length of the sheet S1 input to the sheet size detection unit 93 by the operator. Calculate the speed.

  When the control device 81 drives the adjustment motor 363 so that the rotation speed calculated based on the conveyance direction length of the sheet S1 from the sheet size detection unit 93, the rotation speeds of the cam 304 and the sub cam 305 are increased or decreased. The

  As a result, the swing speed of the first lever 313 and hence the swing speed of the second lever 325 are increased or decreased by the cam 304, so that the holding claw device 31bt of the reverse swing device 31b is swung at a high speed via the second lever 325. Or swinging at a low speed.

  Here, the control of the adjustment motor 363 by the control device 81 will be described. First, the control device 81 is set with a conveyance direction length (reference length) as a reference of the sheet S1, and when the sheet S1 having the reference length is conveyed, the adjustment motor 363 is stopped without being driven. deep. As a result, the cam 304 and the sub cam 305 rotate at the reference speed without being decelerated and increased.

  When the gripping claw device 31bt of the reversing swing device 31b grips the trailing end of the sheet S1 from the pre-reversing double cylinder 39 by the rotation of the cam 304 and the sub cam 305, the gripping claw device 31bt transports the sheet S1. That is, when the sheet S1 is transferred to the printing cylinder holding claw devices 33a to 33c of the printing cylinder 33 by swinging at the same speed as the circumferential speed of the pre-reversing double cylinder 39, the traveling speed of the printing cylinder holding claw devices 33a to 33c, that is, It swings at the same speed as the peripheral speed of the printing cylinder 33. When the sheet S1 is received / delivered, the speed difference from the counterpart cylinder is eliminated, and the sheet S1 can be reliably received / delivered.

  Of course, in order for the holding claw device 31bt of the reverse swing device 31b to hold the rear end of the sheet S1 from the pre-reverse double cylinder 39, the rear end of the sheet S1 on the pre-reverse double drum 39 and the hold claw device of the reverse swing device 31b. 31 bt must be opposed to each other, and in order to cause the printing cylinder holding nail devices 33 a to 33 c of the printing cylinder 33 to replace the sheet S 1, the printing cylinder holding nail devices 33 a to 33 c and the reverse swing device 31 b The nail device 31bt must be opposed. When the conveyance direction length of the sheet S1 is the reference length, the gripper device 31bt of the reverse swing device 31b receives the sheet S1 by stopping the adjustment motor 363 and rotating it at the reference speed of the cam 304 and the sub cam 305. / It is positioned at the position necessary for delivery.

  Here, when the conveyance direction length of the sheet S1 is different from the reference length, the position of the rear end of the sheet S1 on the pre-inversion double cylinder 39 is different from the reference length sheet S1, and therefore the reception timing of the sheet S1 is adjusted. In addition, the timing from the receipt of the sheet S1 to the delivery of the sheet S1 to the printing cylinder 33 must be adjusted along with the adjustment of the receipt timing of the sheet S1.

  When the length of the sheet S1 in the conveyance direction is shorter than the reference length, when the sheet S1 is received from the pre-inversion double cylinder 39, the rear end of the sheet S1 shorter than the reference length is longer than the rear end of the sheet S1 having the reference length. In order to reach the receiving position earlier, the holding claw device 31bt of the reversing swing device 31b must be positioned at the receiving position earlier than in the case of the sheet S1 having the reference length. At that time, the control device 81 drives the adjustment motor 363 at the rotation speed calculated based on the length of the sheet S1 in the conveyance direction, and adjusts the rotation speed of the cam 304 and the sub cam 305 via the harmonic drive 361 to perform the reverse swing. The swing operation speed of the gripper device 31bt of the device 31b is increased. As a result, the gripper device 31bt of the reversing swing device 31b can face the rear end of the sheet S1 shorter than the reference length. Further, when the gripping claw device 31bt of the reversing swing device 31b grips the rear end of the sheet S1, the control device 81 stops the driving of the adjustment motor 363, and the speed of the gripping claw device 31bt is changed to the peripheral speed of the front reverse barrel 39. And the same speed. As a result, the rear end of the sheet S1 can be held reliably and accurately.

  Then, in order to receive the sheet S1 whose length in the transport direction is shorter than the reference length, the gripping claw device 31bt of the reversing swing device 31b is positioned at the receiving position earlier than the case of the sheet S1 having the reference length. When the sheet S1 is delivered to the printing cylinder 33, the gripper device 31bt of the reversing swing device 31b is not positioned at the delivery position to the printing cylinder 33 later than the case of the reference length sheet S1, and the The printing cylinder holding nail devices 33a to 33c cannot be opposed to each other. At that time, the control device 81 drives the adjustment motor 363 at the rotation speed calculated based on the length of the sheet S1 in the conveyance direction, and adjusts the rotation speed of the cam 304 and the sub cam 305 via the harmonic drive 361 to perform the reverse swing. The swing operation speed of the gripper device 31bt of the device 31b is decreased. Accordingly, the gripper claw device 31bt of the reversing swing device 31b can be opposed to the print cylinder gripper claw devices 33a to 33c of the printing cylinder 33. Further, when the gripping claw device 31bt of the reverse swing device 31b causes the printing cylinder gripping claw devices 33a to 33c to replace the sheet S1, the control device 81 stops the driving of the adjustment motor 363, and the speed of the gripping claw device 31bt is increased. The peripheral speed of the printing cylinder 33 is the same. As a result, the rear end of the sheet S1 can be held reliably and accurately.

  On the other hand, when the conveyance direction length of the sheet S1 is longer than the reference length, when the sheet S1 is received from the pre-inversion double cylinder 39, the rear end of the sheet S1 longer than the reference length is the rear end of the sheet S1 having the reference length. In order to reach the receiving position later, the holding claw device 31bt of the reversing swing device 31b must be positioned at the receiving position later than the case of the sheet S1 having the reference length. At that time, the control device 81 drives the adjustment motor 363 at the rotation speed calculated based on the length of the sheet S1 in the conveyance direction, and adjusts the rotation speed of the cam 304 and the sub cam 305 via the harmonic drive 361 to perform the reverse swing. The swing operation speed of the gripper device 31bt of the device 31b is decreased. Thereby, the gripping claw device 31bt of the reversing swing device 31b can be opposed to the rear end of the sheet S1 longer than the reference length. Further, when the gripping claw device 31bt of the reversing swing device 31b grips the rear end of the sheet S1, the control device 81 stops the driving of the adjustment motor 363, and the speed of the gripping claw device 31bt is changed to the peripheral speed of the front reverse barrel 39. And the same speed. As a result, the rear end of the sheet S1 can be held reliably and accurately.

  Then, in order to receive the sheet S1 whose length in the transport direction is longer than the reference length, the gripping claw device 31bt of the reversing swing device 31b is positioned at the receiving position later than the case of the sheet S1 having the reference length. When the sheet S1 is delivered to the printing cylinder 33, the gripper device 31bt of the reversing swing device 31b is not positioned at the delivery position to the printing cylinder 33 earlier than the case of the reference length sheet S1, so that the The printing cylinder holding nail devices 33a to 33c cannot be opposed to each other. At that time, the control device 81 drives the adjustment motor 363 at the rotation speed calculated based on the length of the sheet S1 in the conveyance direction, and adjusts the rotation speed of the cam 304 and the sub cam 305 via the harmonic drive 361 to perform the reverse swing. The swing operation speed of the gripper device 31bt of the device 31b is increased. Accordingly, the gripper claw device 31bt of the reversing swing device 31b can be opposed to the print cylinder gripper claw devices 33a to 33c of the printing cylinder 33. Further, when the gripping claw device 31bt of the reverse swing device 31b causes the printing cylinder gripping claw devices 33a to 33c to replace the sheet S1, the control device 81 stops driving the adjustment motor 363 and prints the speed of the gripping claw device 31bt. The speed is the same as the peripheral speed of the barrel 33. As a result, the rear end of the sheet S1 can be held reliably and accurately.

  As described above, when the length in the conveyance direction of the sheet S1 is different from the reference length, the control device 81 sets the speed of the gripping claw device 31bt of the reversing swing device 31b to the reference speed when heading toward the pre-reversing double drum 39. The speed is increased or decreased. When the trailing edge of the sheet S1 is received from the pre-reverse double cylinder 39, the reference speed is set. When the print cylinder 33 is moved, the reference speed is decreased or increased, and the sheet S1 is transferred to the printing cylinder 33. In some cases, the adjustment motor 363 is controlled so that the reference speed is obtained.

  As described above, the swing mechanism 300 has a simple configuration in which the harmonic drive 361 and the adjustment motor 363 are interposed between the gear 290 and the gear 303, and the reverse rotation swing without changing the configuration of the digital printing unit 3 itself. Since the swing operation speed of the gripper claw device 31bt of the device 31b can be adjusted, the sheet S1 can be reliably and accurately received even when the length of the sheet S1 in the sheet conveyance direction is longer or shorter than the reference length. / The delivery can be performed, and the front and back of the sheet S1 can be reversed.

<Other embodiments>
In the above-described embodiment, a case has been described in which the control device 81 adjusts the rotational phase of the camshaft 301 via the adjustment motor 363 and the differential gear mechanism 361 as an adjustment unit. However, the present invention is not limited to this, and a single servo motor (not shown) as a swinging motor is directly connected to the swing shaft 31J of the reversing swing device 31b so as to be reversed without using the cam 304, the sub cam 305, and the harmonic drive 361. The swing device 31b may be configured to swing, and the control device 81 may control a single servo motor (not shown) to swing the swing shaft 31J of the reverse swing device 31b.

  In the above-described embodiment, the case where the control device 81 adjusts the rotational phase of the cam shaft 301 via the adjustment motor 363 and the differential gear mechanism 361 has been described. However, the present invention is not limited to this. For example, as shown in FIG. 11, a motor 371 as a swinging motor is directly connected to the camshaft 301 to rotate the camshaft 301 without using the harmonic drive 361, and the control device 81 is a motor. The cam shaft 301 may be rotated by controlling 371.

  Furthermore, in the above-described embodiment, the case where the conjugate cam constructed by the cam 304 and the sub cam 305 is used has been described. However, the present invention is not limited to this, and the same angle range as that when the conjugate cam is used. If the second lever 325 can be swung only by the cam 304 without using the sub cam 305, or the second lever 325 can be swung by an air cylinder.

  Further, in the above-described embodiment, the case where the printing cylinder 33 having a triple cylinder is used has been described. However, the present invention is not limited to this, and the double cylinder, the quadruple cylinder, the six cylinder, etc. A printing cylinder may be used.

  DESCRIPTION OF SYMBOLS 1 ... Digital printing apparatus (sheet conveyance apparatus), 2 ... Paper feeding apparatus, 3 ... Digital printing unit, 4 ... Paper discharge apparatus, 21, 41 ... Loading platform, 23 ... Soccer apparatus, 25 ... Negative pressure source, 26 ... Continuous Supply valve, 27 ... intermittent supply valve, 31b ... reverse swing device (third transport unit), 31bt ... gripper device (third holding device), 31f ... swing device, 32 ... paper feed side transfer cylinder, 33 ... printing cylinder (Second transport unit), 33a to 33c ... printing cylinder holding nail device (second holding device), 34 ... ink jet nozzle unit, 35 ... ink drying lamp, 36 ... first paper discharge side transfer cylinder, 37 ... second 38 ... paper take-up cylinder, 39 ... pre-reversing double cylinder (first transport unit), 39a ... gripper device (first holding device), 40 ... delivery belt, FB ... feeder board, S1 ... Sheet, 80 ... Print mode selection , 81 ... Control device (control unit), 82 ... Conveyance path switching means, 93 ... Sheet size detection unit, 94 ... Phase detection sensor, 300 ... Swing mechanism, 301 ... Cam shaft, 302, 306, 315, 317, 320, 333, 335, 336, 337 ... bearing, 304 ... cam, 305 ... sub cam, 311 ... lever shaft, 317, 322 ... coupling member, 332 ... cam follower, 325 ... second lever, 327 ... segment gear, 331 ... first 3 levers, 203 ... claws, 205 ... claw bases, 361 ... harmonic drive (adjustment unit), 371 ... motor, 363 ... adjustment motor (adjustment unit), 383 ... drive motor.

Claims (4)

In a sheet conveying apparatus that conveys a sheet,
A first conveying unit having a first holding device that holds and conveys the edge of the sheet;
A second transport unit having a second holding device for transporting while holding an end of the sheet transported by the first transport unit;
The first conveyance unit and the second conveyance unit are swingably supported, and one end holds the other end of the sheet held by the first holding device, and the other end of the sheet A third conveying unit having a third holding device that delivers the end of the second conveying unit to the second holding device of the second conveying unit;
And a control unit that controls a swinging operation of the third conveyance unit based on a length in the conveyance direction of the sheet. The controller is
The speed of the third holding device,
When receiving a sheet from the first transport unit, the same speed as the sheet transported by the first transport unit,
When delivering a sheet to the second transport unit, the second transport unit is controlled to have the same speed as the second holding device, and
The swing speed of the third transport unit from when the sheet is received from the first transport unit to when the sheet is delivered to the second transport unit is controlled based on the length of the sheet in the transport direction. The sheet conveying apparatus according to claim 1. An adjustment unit for adjusting the swing speed of the third transport unit;
The adjustment unit includes a differential gear mechanism provided in a drive system of the third transport unit, and an adjustment motor that drives the differential gear mechanism to adjust the swing speed of the third transport unit,
The sheet conveying apparatus according to claim 2, wherein the control unit controls the adjustment motor. A swing motor for swinging the third transport unit independently of the first transport unit and the second transport unit;
The sheet conveying apparatus according to claim 2, wherein the control unit controls the swing motor.

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