JP2013241274A - Swing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elongate a transfer distance by obtaining a deflection angle more larger than a conventional one while utilizing a cam constitution.SOLUTION: A swing device 300 comprising a sheet holding device 31bt for holding a sheet S1 and having a swing part 31b supported to a swing shaft 31j which is supported so as to be turnable comprises: a pinion gear 31p fixed to the swing shaft 31j; a cam 304 fixed to a cam shaft 301 which is supported so as to be rotatable; a lever shaft 31 which is supported so as to be turnable; a first lever 313 having a cam follower 317 which is fixed to a lever shaft 311 and abuts on the cam 304; an energization means 322a for energizing the first lever 313 so that the cam follower 317 may be push-pressed to the cam 304; and a segment gear 327 which is fixed to the lever shaft 311 and engaged with the pinion gear 31p, and has a large diameter larger than a diameter of the pinion gear 31p.

Description

  The present invention relates to a swing device that conveys a sheet by swinging.

  2. Description of the Related Art Conventionally, there is a swing device that conveys a sheet while swinging in a state of being held by a gripper device (see, for example, Patent Document 1). In this swing device, a swing device is used in a portion where the sheet is transferred from the sheet feeding device to the impression cylinder, and the swing of the swing device is performed by a cam.

Japanese Patent No. 3638074

  However, there is a problem that the swing angle of the swing is limited only by swinging by the cam, and the sheet conveyance distance is limited to a close distance.

  The present invention has been made to solve such a problem, and intends to propose a swing device that can extend the sheet conveyance distance with a larger deflection angle than the conventional one while utilizing the cam configuration. It is.

  In order to solve this problem, in the invention of claim 1, in a swing device having a seat holding device for holding a seat and having a swing portion supported by a swing shaft supported rotatably, the seat is fixed to the swing shaft. A pinion gear, a cam fixed to a cam shaft rotatably supported, a lever shaft rotatably supported, and a first lever having a cam follower fixed to the lever shaft and contacting the cam Urging means for urging the first lever so as to press the cam follower against the cam; a segment gear fixed to the lever shaft and meshing with the pinion gear; and having a diameter larger than the diameter of the pinion gear; Be prepared.

  According to a second aspect of the present invention, the biasing means includes: a sub cam fixed to the cam shaft; and a third lever having a cam follower that contacts the sub cam and rotatably supported by the lever shaft. Is provided between the first lever and the third lever, and biases the third lever so as to press the cam follower of the third lever against the sub cam.

  According to the first aspect of the present invention, the urging means pushes the cam follower of the first lever in contact with the cam so that the swing angle of the segment gear fixed to the lever shaft integral with the first lever is pinion. By converting the swing angle of the swing part with a gear, the sheet conveying distance of the sheet holding device by the swing part can be extended. Thus, while using the cam structure, the swing angle is much larger than before. A swing device that extends the sheet conveyance distance can be realized.

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 time when the swing mechanism of an inversion swing apparatus is expand | deployed. 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.

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

<Digital printing device>
As shown in FIG. 1, the digital printing apparatus 1 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 is disposed in contact with the sheet feeding side transfer cylinder 32 on the downstream side in the sheet conveying direction from the swing device 31f, and the printing cylinder 33 is rotatably supported by the frame 3a. The printing cylinder 33 includes a printing cylinder holding claw device 33a, 33b, 33c that receives and holds the leading end of the sheet S1 from the holding claw device 32a of the paper feeding side transfer cylinder 32, and the printing cylinder holding claw device 33a, 33b, 33c. Correspondingly provided support surfaces 33d, 33e, 33f for supporting the sheet S1, and in the present embodiment, a triple cylinder is provided in which three sets of the printing cylinder holding nail device and the support surface are provided. The diameter of the paper feeding side transfer cylinder 32 is three times as large. 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 is disposed in contact with the paper discharge cylinder 38 on the downstream side of the second paper discharge side transfer cylinder 37 and the paper take-up cylinder 38. The pre-reverse double cylinder 39 is disposed on the frame 3a. It is supported rotatably. 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 holding claw device 39a is provided.

  Here, the pre-reverse double cylinder 39 is connected to a drive motor (not shown) that can be independently driven independently from the printing cylinder 33, the second discharge side transfer cylinder 37, the reverse swing device 31b, and the like. If the single-sided printing mode is selected, the driving is stopped via the driving motor under the control of the control unit.

  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 swinging part that receives and holds the (butt side end) is disposed oppositely. The reversing swing device 31b also constitutes a reversing unit that reverses the front and back of the sheet S1.

  In the reversing swing device 31b, the swing arm 202 is rotatably supported on the swing shaft 31j, and the swing claw 203 as a claw is rotatably supported on the tip of the swing arm 202 via the rotation shaft 203a. ing.

  A claw base 205 is fixed to the swing arm 202 at a position facing the swing claw 203 of the reversing swing device 31b, and a sheet holding device that holds the sheet S1 between the claw base 205 and the swing claw 203. A gripper device 31bt is configured.

  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 33a so as to be swingable with respect to 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 The conveyance destination of the sheet S1 is switched to the paper discharge device 4 or the reverse swing device 31b, that is, the conveyance path of the sheet S1 is switched to the sheet discharge route or the sheet reverse route.

<Swing mechanism of reverse swing device>
Next, as shown in FIGS. 3 and 4, the swing mechanism 300 of the reverse swing device 31b in the digital printing unit 3 will be described.

  A swing mechanism 300 as a swing device includes a camshaft 301 rotatably supported by bearings 302 and 306 between a subframe 3as1 and a subframe 3as2 of the machine, and a cam 304 and a subcam 305 are attached to the camshaft 301. It is fixed. A gear 303 meshed with a gear 290 that is rotated by a drive source of this machine is attached to 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. Accordingly, the cam follower 317 of the first lever 313 is pressed against the cam 304 by the spring 322a, and the cam follower 332 of the third lever 331 is pressed 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.

<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, the digital printing apparatus 1 operates the continuous supply valve 26, whereby the first suction 23 a and the second suction 23 b are moved to the loading table 21. The sheet S1 is adsorbed and conveyed 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 valve is "opened" at each timing (first period) at which the printing cylinder gripping devices 33a to 33c and the gripping device 32a of the feeding side transfer cylinder 32 face each other at 33, and the first suction 23a and the second suction The suction from the negative pressure source 25 of 23b is controlled. 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 at the timing of continuous feeding.

  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 oscillated toward the sheet feeding side transfer cylinder 32 by the swing of the swing device 31f and conveyed. The leading end of the sheet S1 is replaced by the gripping claw device 32a of the feeding side transfer cylinder 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 closely contacts 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 S <b> 1 is in close contact with the support surfaces 33 d to 33 f of the printing cylinder 33, the sheet S <b> 1 is conveyed in a state where a minute gap between the ink jet nozzle heads 34 a to 34 d 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.

  As shown in FIG. 5, in the contact portion between the printing cylinder 33 and the first paper discharge side transfer cylinder 36, the print cylinder holding claw 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. 6, 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 holding claw device 37a of the second discharge side transfer cylinder 37 releases the holding of the leading edge of the sheet S1 at the contact portion between the second discharge side transfer cylinder 37 and the paper take-up cylinder 38. At the same time, the gripping claw device 38a of the paper drum 38 holds the leading end 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 double-sided printing mode is selected by the operator's operation, the digital printing apparatus 1 causes the control device to operate the intermittent supply valve 27, whereby the first suction 23 a and the second suction 23 b are moved to the sheets on the stacking table 21. S1 is sucked and conveyed to the feeder board FB.

  The intermittent supply valve 27 supplies the sheet S1 at every other sheet timing (second period that is twice the first period), in other words, the printing cylinder 33. At the timing when the printing cylinder gripping device 33a to 33c and the gripping device 32a of the paper feeding side transfer cylinder 32 face each other, the valves are “open”, “closed”, “open”, “closed”,. It is controlled to become. This is twice as long as the continuous feeding period. 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, printing is performed on a new sheet S1 held every other printing cylinder holding nail device 33a-33c of the printing cylinder 33, and printing cylinder holding nail devices 33a-33c not holding the sheet S1. 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 corresponding to.

  In the double-sided printing mode, the sheet S1 printed on the surface by the ink jet nozzle unit 34 is not delivered from the second paper discharge side transfer cylinder 37 to the paper take-up cylinder 38, but before-inversion double cylinder 39. Is passed on.

  As described above, in the case of the double-sided printing mode, when printing is performed on the front side but printing is not performed on the other side (back side), the second discharge-side transfer cylinder 37 and the paper While the nail of the gripping claw device 37a of the second paper discharge side transfer cylinder 37 is kept open without being opened at the portion of contact with the take-up cylinder 38, that is, the state where the leading edge of the sheet S1 is held is maintained. The claw of the gripping claw device 38a of the paper drum 38 is maintained 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 double cylinder 39 before reversal. That is, the claw of the gripping claw device 39a of the pre-reverse double cylinder 39 is closed at the contact portion between the second paper discharge side transfer cylinder 37 and the pre-reverse double cylinder 39, and the leading edge of the sheet S1 is held. The nail of the gripping claw device 37a of the paper discharge side transfer cylinder 37 is opened to release the holding of the leading edge of the sheet S1, and as shown in FIG. The leading end of the sheet S1 is replaced by the holding claw device 39a of the double drum 39.

  As shown in FIG. 8, the sheet S1 conveyed along with the rotation of the pre-reversing double drum 39 rotates 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. Is held by the gripping claw device 31bt of the reversing swing device 31b, and at the same time, the holding claw device 39a of the pre-reversing double cylinder 39 is released from the leading edge of the sheet S1, so The rear end of the sheet S1 is replaced.

  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 FIGS. 3 and 4, in the swing mechanism 300, when the gear 303 is rotated via the gear 290 that is rotated by the drive source of this machine, the cam 304 and the cam 304 are connected via the cam shaft 301. The sub cam 305 rotates.

  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.

<Other embodiments>
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 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.

  In the above-described embodiment, the case where the printing cylinder 33 having a triple cylinder is used has been described. A printing cylinder may be used.

  DESCRIPTION OF SYMBOLS 1 ... Digital printing apparatus, 2 ... Paper feeding apparatus, 3 ... Digital printing unit, 4 ... Paper discharge apparatus, 21 and 41 ... Loading platform, 23 ... Soccer device, 25 ... Negative pressure source, 26 ... Continuous supply valve, 27 ... Intermittent supply valve, 31b ... reverse swing device (swing part), 31bt ... gripper device (sheet holding device), 31f ... swing device, 31j ... swing shaft, 31p ... pinion gear, 32 ... paper feed side transfer cylinder, 33 ... Printing cylinder 34 ... Inkjet nozzle part 35 ... Ink drying lamp 36 ... First paper discharge side transfer cylinder 37 ... Second paper discharge side transfer cylinder 38 ... Paper take-up cylinder 39 ... Double cylinder before reversal, 40 ... Delivery belt, FB ... Feeder board, S1 ... Seat, 300 ... Swing mechanism (swing device), 301 ... Cam shaft, 302, 306, 315, 317, 320, 333, 335, 33 337: Bearing, 304 ... Cam, 305 ... Sub cam, 311 ... Lever shaft, 313 ... First lever, 317, 332 ... Cam follower, 322 ... Connecting member, 322a ... Spring (biasing means), 325 ... Second lever, 327 ... Segment gear, 331 ... Third lever.

Claims (2)

In a swing device including a seat holding device that holds a seat and having a swing portion supported by a swing shaft that is rotatably supported,
A pinion gear fixed to the swing shaft;
A cam fixed to a camshaft rotatably supported;
A lever shaft supported rotatably,
A first lever having a cam follower fixed to the lever shaft and contacting the cam;
Biasing means for biasing the first lever to press the cam follower against the cam;
And a segment gear fixed to the lever shaft and meshing with the pinion gear and having a diameter larger than the diameter of the pinion gear. A sub cam fixed to the cam shaft;
A cam follower that contacts the sub cam, and a third lever rotatably supported by the lever shaft;
The biasing means is provided between the first lever and the third lever, and biases the third lever so as to press the cam follower of the third lever against the sub cam. Item 4. The swing device according to Item 1.

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