JP6104690B2 - Inverted sheet processing device - Google Patents

Description

  The present invention relates to a sheet processing apparatus having a sheet reversing mechanism for printing, for example, the back surface of a sheet after printing the surface of the sheet.

  2. Description of the Related Art Conventionally, there is a sheet-fed rotary printing machine with a reversing mechanism having a sheet reversing mechanism for reversing and printing the back surface after printing the front surface of a sheet (see, for example, Patent Document 1). This sheet-fed rotary printing press with a reversing mechanism includes a reversing unit capable of reversing sheets between adjacent printing units, and can perform single-sided printing and double-sided printing.

  In addition, there is a sheet-fed rotary printing machine provided with a swing mechanism in which a swing nail opening / closing roller rolls on a cam surface of a swing nail opening / closing cam and a sheet is conveyed by a swing nail whose tip swings (for example, Patent Document 2).

Japanese Patent Publication No. 03-080108 Japanese Patent No. 4440401

  However, in the sheet-fed rotary printing press with the reversing mechanism of Patent Document 1, the first printing unit that prints the front surface of the sheet and the second printing unit that prints the back surface are provided independently, There was a problem that the entire printing press would become large.

  Further, in the sheet-fed rotary printing machine of Patent Document 2, a swing mechanism is provided in a portion where the sheet is transferred from the sheet supply device to the conveyance cylinder, and the sheet conveyed from the supply device is stopped by the front contact. After that, the front end portion of the sheet is held by the swing claw of the swing mechanism, the swing mechanism swings in the sheet conveying direction, and the sheet is changed to the conveying cylinder.

  That is, the sheet-fed rotary printing machine of Patent Document 2 conveys the sheet conveyed from the supply device as it is received by the swing mechanism. Even if such a swing mechanism is applied to the invention of Patent Document 1, The entire printing press could not be reduced in size and configuration.

  The present invention has been made to solve such a problem, and an object of the present invention is to propose a reversible sheet processing apparatus having a small and simple configuration capable of reversing a sheet and transporting the sheet.

  In order to solve such a problem, in the first aspect of the invention, in a reversible sheet processing apparatus that conveys a sheet and performs a predetermined process on the sheet, a first cylinder that retains and conveys the sheet, and retains the sheet A second cylinder that conveys the sheet and a reversing swing device that receives the sheet from the first cylinder and transfers the sheet to the second cylinder, the reversing swing device including the first cylinder A gripper claw device supported between the second barrel and swingable and having a claw for gripping a sheet; a cam follower provided on the gripper claw device; and a cam follower engaged with the cam follower. A swing cam that opens and closes the claw, and the swing cam opens to the first claw opening cam surface that opens the claw when the sheet is received from the first torso, and to the second torso. Sheet receiver A first claw opening cam surface that opens the claw during the operation, and a first claw that is formed between the first claw opening cam surface and the second claw opening cam surface and closes the claw. A fixed cam having a closing cam surface, and a second claw closing cam surface formed on the downstream side of the first claw opening cam surface in the movement direction of the gripper claw device to the first barrel, An operating position where the cam follower engages with the gripping cam surface when the cam follower faces the first pawl opening cam surface; and the fixed cam of the cam follower A movable cam that is supported so as to be movable between a retracted position that allows engagement with the first claw opening cam surface, and the gripper claw device is disposed behind the sheet held by the first torso. Grab the edge to receive the sheet from the first cylinder, after the sheet The so that passed into the second cylinder.

  According to a second aspect of the present invention, the retracted position of the moving cam is a position where the cam follower engages with the first claw closing cam surface and the holding cam surface.

  According to a third aspect of the present invention, the moving cam is rotatably supported by a swing shaft and is connected to a rotating body that is driven to rotate by a lever.

  According to the first aspect of the present invention, when the gripping claw device moves toward the first body, the cam follower engages with the first claw opening cam surface of the fixed cam to open the claw and is at the tip thereof. When the claw is closed when engaged with the second claw closing cam surface, the rear end of the sheet conveyed by the first drum can be grasped by the reverse swing device, and then the grip claw device is the first claw device. When the moving cam moves from the first cylinder to the second cylinder, the moving cam moves to the operating position, so that the cam follower engages with the holding cam surface of the moving cam without engaging the first pawl cam surface. As a result, the sheet can be held in a closed state without opening the nail and reliably conveyed to the second cylinder to reverse the sheet.

  According to the second aspect of the present invention, the moving cam applies an unnecessary load or impact to the cam follower by setting the position where the cam follower is engaged with both the first claw closing cam surface and the holding cam surface as the retracted position. The moving cam can be smoothly moved between the retracted position and the operating position without any trouble.

  According to the third aspect of the present invention, the moving cam is moved by a lever connected to a rotating body that is rotationally driven, so that the moving cam is lifted as compared with a configuration in which the moving cam moves by a combination of a cam and a cam follower. The moving cam can function stably without causing problems such as wear and cam wear.

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 the swing cam of a reverse swing apparatus. It is a side view which shows the motion of a swing cam when maintaining the state which hold | maintained the sheet | seat with the swing nail | claw. 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.

<Configuration of digital printing device>
As shown in FIG. 1, a digital printing apparatus 1 as a reversing sheet processing 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 sheet 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 the continuous supply valve 26 and the 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 paper 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 cylinder is disposed in contact with the sheet feeding-side transfer cylinder 32 downstream of the swing device 31f in the sheet conveying direction, 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, printing cylinder holding nail devices 33a, 33b, and 33c that hold the sheet S1 are provided in a state in which the phases are shifted 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 inkjet nozzle portion 34 is disposed opposite to the peripheral surface of the printing cylinder 33 on the downstream side in the sheet conveying direction from the contact portion of the printing cylinder 33 with the sheet feeding side transfer cylinder 32.

  A plurality of inkjet nozzle heads 34 a to 34 d in which inks of different colors are set are arranged in the inkjet nozzle portion 34 side by side along the circumferential surface of the printing cylinder 33, and each of them is a circumferential surface of the printing cylinder 33. Is 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 support surfaces 33d, 33e, and 33f is slightly spaced. The printing cylinder 33 and the inkjet nozzle unit 34 constitute a sheet printing apparatus as a sheet processing 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. 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 discharge side transfer drum 37 is rotatably supported by the frame 3a. The second paper discharge side transfer drum 37 is provided with a gripper device 37a that receives and holds 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 is provided on which the sheets S1 subjected to digital printing processing by the digital printing unit 3 are stacked. 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 (first conveyance cylinder) as a first cylinder is disposed in contact with the downstream side of the second sheet discharge side transfer cylinder 37 where the paper discharge cylinder 38 is in contact with the paper conveyance cylinder 38. Then, the pre-inversion double cylinder 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.

  A rear end (butt side end) as the other end of the sheet S1 is received on the downstream side in the sheet conveyance direction with respect to the second paper discharge side transfer cylinder 37 where the pre-reverse double cylinder 39 is in contact with the second discharge side transfer cylinder 37. A reversing swing device 31 b having a holding claw device 120 (FIG. 2, FIG. 3) for holding is disposed to face the pre-reversing double drum 39.

  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 arranged 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 first paper discharge side transfer drum 36, the second paper discharge side transfer drum 37, the pre-reverse double drum 39, and the reverse swing device 31b constitute a reversing mechanism, and the first paper discharge side transfer drum 36, The path of the sheet S1 conveyed by the 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 drum 37 can selectively deliver the sheet S1 to the gripping claw device 38a of the paper take-up drum 38 and the gripping claw device 39a of the pre-reverse double cylinder 39. Driven. 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 device 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.

<Configuration of reverse swing device>
Next, the reverse swing device 31b swings (swings) toward the pre-reverse double cylinder 39 to receive the sheet S1 conveyed by the pre-reverse double cylinder 39, and after replacing the sheet S1, the pre-reverse double A configuration that swings (oscillates) in the opposite direction away from the body 39 will be described with reference to FIGS.

  The gripping claw device 120 of the reversing swing device 31b is provided at the tip of a swing arm (not shown) that is swingably supported, and is driven separately from the pre-reversing double cylinder 39 and the printing cylinder 33. . The claw device 120 includes a claw shaft 121b rotatably supported, a claw body 121 fixed to the claw shaft 121b and provided with a claw 121a, one end fixed to the claw shaft 121b, and a cam follower 122 on the other end. And a supported lever 123. Thereby, the claw 121a is swung through the lever 123, the claw shaft 121b, and the claw body 121 by the swing of the cam follower 122 due to the engagement with the fixed cam 125 described later.

  The gripping claw device 120 has a claw base 124 attached to a claw base holding portion (not shown) provided at the tip of the swing arm, and the claw base 124 is a sheet in cooperation with the claw 121a. Add S1. As the claw 121a swings, the claw 121a comes into contact with and separates from the claw base 124 and holds the sheet S1 or releases the grip. This swinging motion of the claw 121a is called opening / closing of the claw 121a. Holding the sheet S1 between the claw 121a and the claw base 124 is called “close”, and when the claw 121a is separated from the claw base 124 and does not hold the sheet S1 is called “open”. The claw shaft 121b is provided with a biasing means (not shown) that biases the claw 121a in the closing direction.

  The reversing swing device 31b is fixed to the frame 3a, and the cam follower 122 of the gripper claw device 120 engages and rotates on the outer peripheral surface thereof. The reversing swing device 31b is supported rotatably about the swing shaft 126sg. The cam follower 122 of the gripper claw device 120 is engaged and rolled on the outer peripheral surface thereof. The fixed cam 125 is formed in a semicircular arc shape, and an arc-shaped cam surface is formed on the outer peripheral portion. The center of the arc-shaped cam surface of the fixed cam 125 is the same as the center cr of the swing shaft 126 sg of the moving cam 126. I'm doing it.

  Here, a swing cam is configured by the fixed cam 125 of the reverse swing device 31b and the moving cam 126 superimposed on the fixed cam 125. That is, the reverse swing device 31b includes the gripper device 120 and the swing cam (the fixed cam 125 and the moving cam 126).

  The fixed cam 125 includes a first claw closing cam surface 125d, a second claw closing cam surface 125a, a third claw closing cam surface 125e, and first to third claw closing cams which are formed to have a large diameter. A first claw opening cam 125c and a second claw opening cam 125b that are formed to have a smaller diameter than the surfaces 125d, 125a, and 125e are provided. The first claw closing cam surface 125d, the second claw closing cam surface 125a, and the third claw closing cam surface 125e have the same cam surface height, and the first claw opening cam 125c, The cam surface height of the claw opening cam 125b is the same. Incidentally, the third claw closing cam surface 125e functions as a standby position where the gripper claw device 120 stands by.

  The movable cam 126 includes a base portion 126a fixed to the swing shaft 126sg, a connecting portion 126b provided on the base portion 126a, and a cam portion 126c having a gripping cam surface 126m. Here, the height of the gripping cam surface 126m is set to the same height as the first to third claw closing cam surfaces 125d, 125a, and 125e of the fixed cam 125.

  The connecting portion 126b of the moving cam 126 is connected to one end of an arm 128 of the moving cam rotating mechanism 130 described later via a pin 127, and the other end of the arm 128 is connected to the lever 132 of the moving cam rotating mechanism 130. The pins 133 are connected.

  A rotating shaft 131 of the moving cam rotating mechanism 130 is rotatably supported by the frame 3a and is rotationally driven by a drive unit (not shown) of the apparatus. The base end portion of the lever 132 is fixed to the rotating shaft 131. That is, the lever 132 is rotated with the rotation of the rotating shaft 131.

  One end of the arm 128 is connected to the connecting portion 126b of the moving cam 126 via the pin 127 and the other end is connected to the lever 132 via the pin 133. Therefore, the arm 128 moves when the rotating shaft 131 and the lever 132 rotate. The cam 126 reciprocates between the operating position and the retracted position via the lever 128. Here, the operating position is the position (FIG. 3) of the moving cam 126 where the cam follower 122 engages with the gripping cam surface 126m when the cam follower 122 faces the first claw opening cam surface 125c (retracted position). Is the position of the moving cam 126 that permits the cam follower 122 to engage with the first claw opening cam surface 125c of the fixed cam 125 (FIG. 2).

<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 control device (not shown) operates the continuous supply valve 26, whereby the first suction 23a and the second suction 23b are activated. The sheet S1 on the loading table 21 is sucked 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 device 33a to 33c in 33 and the gripping device 32a of the paper feeding side transfer cylinder 32 face each other. The suction 23b is controlled to be sucked 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. By operating the continuous supply valve 26, the soccer device 23 conveys the sheet S1 to the feeder board FB in the first cycle.

  The sheet S1 conveyed by the feeder board FB is held by the gripping claw device of the swing device 31f and then oscillated toward the sheet feeding side transfer cylinder 32. The sheet S1 is held by the sheet feeding side transfer cylinder 32. The leading end of the sheet S1 is replaced by the nail device 32a.

  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 land 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. 4, in the contact portion between the printing cylinder 33 and the first discharge-side transfer cylinder 36, the first discharge-side transfer cylinder 36 is held from the printing cylinder holding claw devices 33 a to 33 c of the printing cylinder 33. The leading end of the sheet S1 is replaced with the nail device 36a. After that, as shown in FIG. 5, the sheet S <b> 1 held by the holding 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 holding claw device 38a of the paper take-up cylinder 38 holds the leading end of the sheet S1, and the holding is changed. As a result, the sheet S1 is transferred from the second delivery side transfer cylinder 37 to the paper take-up cylinder 38 and conveyed.

  The sheet S1 that has been replaced by the paper take-up cylinder 38 is released from being held by the holding claw device 38a at the timing when the holding claw device 38a of the paper take-up cylinder 38 is positioned above the delivery belt 40 and placed on the delivery belt 40. It is done.

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

  On the other hand, when the double-sided printing mode is selected by the operator's operation, the control device operates the intermittent supply valve 27, whereby the first suction 23a and the second suction 23b suck the sheet S1 of the stack 21 and the feeder board. Transport to FB.

  The intermittent supply valve 27 supplies the sheet S1 at every other sheet timing with respect to the continuous feeding timing, in other words, the printing cylinder holding claw devices 33a to 33c in the printing cylinder 33 and the feeding side transfer cylinder 32. The valve is controlled to be “open”, “closed”, “open”, “closed”,... At the timing (second period) when the gripper claw device 32a faces. 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. By the operation of the intermittent supply valve 27, 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, the control device 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, and does not hold 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 33a to 33c.

  In the double-sided printing mode, the sheet S1 printed on the surface by the ink jet nozzle section 34 is received by the pre-reverse double cylinder 39 without being transferred from the second paper discharge side transfer cylinder 37 to the paper take-up cylinder 38. Passed.

  As described above, in the case of the duplex printing mode, when printing is performed on the front surface but digital printing processing is not performed on the other surface (back surface), the second paper discharge is performed under the control of the control device. At the part where the side transfer cylinder 37 and the paper take-up cylinder 38 are in contact with each other, the claw of the gripping claw device 37a of the second paper discharge side transfer cylinder 37 remains open without closing, that is, the leading end of the sheet S1 is held. Is maintained, and the claw of the gripping claw device 38a of the paper drum 38 is maintained without being closed.

  As a result, the sheet S1 is conveyed from the second discharge side transfer drum 37 to the paper take-up drum 38 without being replaced by the pre-inversion double drum 39. At the contact portion between the second paper discharge side transfer cylinder 37 and the pre-reverse double cylinder 39, the nail of the gripping claw device 39a of the pre-reverse double cylinder 39 is closed 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 leading end of the sheet S1 is replaced by the holding claw device 39a of the trunk 39.

  As shown in FIG. 7, the sheet S1 conveyed along with the rotation of the pre-inversion double cylinder 39 is conveyed along with the rotation of the pre-inversion double cylinder 39, while the other side of the sheet S1 is received at the receiving position indicated by the broken line of the reverse swing device 31b. At the same time that the rear end (butt side end) as the end portion of the reverse swing device 31b is held by the gripping claw device 120 of the reversing swing device 31b, the gripping claw device of the pre-reversing double drum 39 is simultaneously held. The holding of the leading end portion as one end portion of the sheet S1 by 39a is released.

  The holding / replacement operation of the sheet S1 by the holding claw device 120 of the reversing swing device 31b in this case will be specifically described. When the gripper claw device 120 of the reversing swing device 31b rotates counterclockwise in the drawing from the position on the printing cylinder 33 side indicated by the solid line in FIG. The third claw closing cam surface 125e, the second claw opening cam surface 125b, and the first claw closing cam surface 125d are engaged in this order. At this time, the claw 121a is opened by the second claw opening cam surface 125b from the closed position at the standby position of the third claw closing cam surface 125e as shown by the broken line in FIG. Although the closing operation is performed by the surface 125d, the sheet S1 is not replaced by the opening / closing operation of the claw 121a.

  Further, when the gripper claw device 120 moves toward the pre-reverse double drum 39, the cam follower 122 is arranged in the order of the first claw closing cam surface 125d, the first claw opening cam surface 125c, and the second claw closing cam surface 125a. Engage with. At this time, the claw 121a is opened from the closed state by the first claw opening cam surface 125c and then closed by the second claw closing cam surface 125a as shown by the broken line in FIG. The leading edge (grip side end) is held by the gripping claw device 39a, and the trailing edge (butt side edge) of the sheet S1 to be conveyed is gripped. Immediately after that, the holding of the leading end (the end of the holding side) of the sheet S1 by the holding claw device 39a of the pre-reversing double drum 39 is released, and the holding claw device 120 of the reverse swing device 31b is switched to the holding claw device 120 from the pre-reverse double drum 39. Complete.

  At this time, the rotating shaft 131 of the moving cam rotating mechanism 130 is rotated by a drive unit (not shown) of the apparatus, and the lever 132 is also rotated together with the rotating shaft 131. Due to the rotation of the lever 132, the moving cam 126 rotates about the swing shaft 126sg counterclockwise through the arm 128, and the gripping cam surface 126m of the moving cam 126 is at the operating position shown in FIG. Positioned.

  As shown in FIG. 3, the operating position of the holding cam surface 126m of the moving cam 126 is on the side of the first claw opening cam surface 125c of the fixed cam 125, and in addition to the second claw closing cam surface 125a. The cam surface is a position where the cam surface continues in the moving direction of the cam follower 122 by the cam surface 126m and the first claw closing cam surface 125d. Thus, when the cam follower 122 of the gripper device 120 faces the first claw opening cam surface 125c of the fixed cam 125, the cam follower 122 contacts the gripping cam surface 126m of the moving cam 126. The first claw opening cam surface 125c located at a position lower than the surface 126m does not come into contact.

  After the holding cam surface 126m of the moving cam 126 is positioned at the operating position, the holding claw device 120 of the reverse swing device 31b that holds the rear end of the sheet S1 on the pre-reverse double cylinder 39 is the reverse shown in FIG. It rotates clockwise from the position on the front double cylinder 39 side toward the printing cylinder 33 side. When the gripper device 120 moves with the sheet S1 being gripped, the cam follower 122 starts with the second claw closing cam surface 125a, the gripping cam surface 126m of the moving cam 126, and the first claw closing cam surface 125d in this order. Engage with. Since the holding cam surface 126m of the moving cam 126 is positioned at the operating position, the cam follower 122 does not engage with the first claw opening cam surface 125c located at a position lower than the holding cam surface 126m. As a result, the nail 121a is kept closed without being opened, so that the sheet S1 is held and the sheet S1 is conveyed while being held by the nail device 120.

  Since the rotating shaft 131 of the moving cam rotating mechanism 130 is continuously rotated by a drive unit (not shown) of this apparatus, the lever 132 is also rotated together with the rotating shaft 131, and the moving cam 126 is connected via the arm 128. Rotates in the clockwise direction in the figure, and the holding cam surface 126m of the movable cam 126 is positioned at the retracted position shown in FIG. Here, the retracted position of the gripping cam surface 126m is a position on the side of the first claw closing cam surface 125d of the fixed cam 125.

  Thereafter, the cam follower 122 of the gripper claw device 120 passes through the gripping cam surface 126m positioned at the retracted position. At this time, the height of the first pawl closing cam surface 125d and the gripping cam surface 126m is the same. The cam follower 122 contacts both the first claw closing cam surface 125d and the holding cam surface 126m, and the claw 121a of the holding claw device 120 maintains the closed state with the sheet S1 added.

  Here, a position at which the first claw closing cam surface 125d of the fixed cam 125 and the holding cam surface 126m of the moving cam 120 are engaged with each other is defined as a retracted position. On the other hand, when the moving cam 120 is separated from the side surface of the fixed cam 125 and the position that does not overlap the fixed cam 125 is set as the retracted position of the moving cam 120, the moving cam 126 overlaps the fixed cam 125. In addition, there is a risk that the moving cam 120 may give an unnecessary load or impact to the side surface of the cam follower 122. However, since the moving cam 126 moves between the operating position and the retracted position while being superimposed on the side surface of the fixed cam 125, there is no danger of giving unnecessary load or impact to the side surface of the cam follower 122. Can be smoothly moved between the retracted position and the operating position.

  When the gripper claw device 120 of the reversing swing device 31b comes to a position facing the printing cylinder 33 as shown by a broken line in FIG. 2, any of the printing cylinder gripping claw devices 33a to 33c of the printing cylinder 33 corresponds to the gripping nail device. Opposite to 120. At that time, the printing cylinder holding nail devices 33a to 33c of the printing cylinder 33 hold the rear end (end side end portion) of the sheet S1 held in the holding nail device 120. Immediately thereafter, the cam follower 122 of the gripping claw device 120 comes into contact with the second claw opening cam surface 125b, and the claw 121a is opened to release the grip at the rear end of the sheet S1. Thus, the rear end holding of the sheet S1 is completed from the holding claw device 120 of the reversing swing device 31b to the printing cylinder holding claw devices 33a to 33c of the printing cylinder 33.

  Thereafter, the holding claw device 120 of the reversing swing device 31b is positioned at the position indicated by the solid line in FIG. 2, and the cam follower 122 is engaged with the third claw closing cam surface 125e (standby position) at that time. 121a is closed without holding the sheet S1.

  Here, since the sheet S1 having the leading end held by the holding claw device 39a of the pre-reversing double cylinder 39 is held by the holding claw device 120 of the reversing swing device 31b, the sheet S1 is transferred. The sheet S1 can be delivered from the pre-inversion double cylinder 39 to the inversion swing device 31b while maintaining high registration accuracy without misalignment.

  Then, since the rear end of the sheet S1 held by the holding claw device 120 of the reverse swing device 31b is held by the printing cylinder holding claw devices 33a to 33c of the printing cylinder 33, the sheet S1 is transferred, so that the registration of the sheet S1 is performed. The sheet S1 can be delivered from the reversing swing device 31b to the printing cylinder 33 while maintaining high registration accuracy without shifting.

  As described above, the reversing swing device 31b has a simple configuration in which the fixed cam 125 and the moving cam 126 are combined, and the claw 121a is opened and closed when the gripper claw device 120 moves toward the pre-reverse double drum 39. When moving toward the printing cylinder 33 from the pre-reversing double cylinder 39, the nail 121a is kept closed and the opening and closing operation is not performed. The opening / closing operation of 121a can be performed.

  Thus, the rear end (end side end portion) of the sheet S1 is held by any of the printing cylinder holding nail devices 33a to 33c of the printing cylinder 33, and the surface of the sheet S1 that has been subjected to digital printing processing by the inkjet nozzle unit 34 ( The surface of the printing cylinder 33 is in contact with the peripheral surface of the printing cylinder 33, and the back surface of the sheet S1 (surface not yet processed by digital printing) is exposed. Be transported.

  At this time, the sheet S1 in the reverse state, which has been transferred from the gripper device 31bt of the reversing swing device 31b, has a surface that has already been subjected to digital printing processing by the inkjet nozzle unit 34 (surface that has been subjected to digital printing processing). In contact with the support surfaces 33d, 33e, and 33f of the sheet S1, and the rear surface of the sheet S1 is exposed (surface not yet processed by digital printing), 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 S1 is conveyed while being turned upside down, and the digital printing process is performed on the back surface of the sheet S1 by the inkjet nozzle unit 34.

  Here, the control device performs printing for the back side of the sheet S1 in the front and back reversed state delivered from the gripper device 120 of the reverse swing device 31b, and print cylinder gripper devices 33a to 33c of the print cylinder 33. The ink jet nozzle heads 34a to 34d of the ink jet nozzle section 34 are controlled so as to perform printing for the front surface on the new sheets S1 held every other one of them. 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 embodiment described above, the digital printing process is performed on the sheet S1 by the pre-reversal double cylinder 39 as the first cylinder, the printing cylinder 33 as the second cylinder, and the reverse swing device 31b as the reverse swing device. Although the case where the present invention is applied to the digital printing apparatus 1 as the reversible sheet processing apparatus of the present invention that performs the present invention has been described, the present invention is not limited thereto, offset printing processing, inspection processing, foil transfer processing, You may make it apply to the inversion-type sheet processing apparatus which performs various processes, such as a die pressing process, with respect to sheet | seat S1.

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, and the like are used. A printing cylinder may be used.

  DESCRIPTION OF SYMBOLS 1 ... Digital printing apparatus (reversing-type sheet processing apparatus), 2 ... Paper feeding apparatus, 3 ... Digital printing unit, 4 ... Paper discharge apparatus, 21 ... Loading platform, 23 ... Soccer apparatus, 25 ... Negative pressure source, 26 ... Continuous Supply valve, 27 ... intermittent supply valve, 31b ... reverse swing device, 31f ... swing device, 32 ... paper feed side transfer cylinder, 33 ... printing cylinder (second cylinder), 34 ... inkjet nozzle section, 35 ... ink drying lamp , 36 ... first discharge side transfer cylinder, 37 ... second discharge side transfer cylinder, 38 ... paper take-up cylinder, 39 ... pre-reversal double cylinder (first cylinder), 40 ... delivery belt, FB ... feeder Board, S1 ... Sheet, 120 ... Nail device, 121 ... Nail body, 122 ... Cam follower, 125 ... Fixed cam (swing cam), 126 ... Move cam (swing cam), 128 ... Arm, 130 ... Move cam rotation mechanism , 31 ... rotating body, 132 ... lever.

Claims (3)

In a reversible sheet processing apparatus that conveys a sheet and performs a predetermined process on the sheet,
A first cylinder that holds and conveys the sheet;
A second cylinder that holds and conveys the sheet;
A reversing swing device for receiving a sheet from the first cylinder and delivering the sheet to the second cylinder;
The reversing swing device is
A holding claw device that has a claw that is supported swingably between the first cylinder and the second cylinder and that can be opened and closed and holds a sheet; a cam follower provided in the holding claw device; A swing cam that engages with the cam follower to open and close the pawl,
The swing cam is
A first claw opening cam surface for opening the claw when the sheet is received from the first cylinder, and a second claw opening for opening the claw when the sheet is transferred to the second cylinder. From a cam surface, a first claw opening cam surface formed between the first claw opening cam surface and the second claw opening cam surface and closing the claw, and the first claw opening cam surface A fixed cam having a second claw closing cam surface formed on the downstream side in the moving direction of the gripping claw device toward the first body,
An operating position where the cam follower engages with the gripping cam surface when the cam follower faces the first pawl opening cam surface; and a fixed cam of the cam follower. A movable cam that is movably supported between a retracted position that allows engagement with the first claw opening cam surface,
The gripper device is
Reversing sheet processing apparatus, wherein a sheet is received from the first cylinder by grasping a rear end of the sheet held by the first cylinder, and the rear end of the sheet is transferred to the second cylinder. . 2. The reversible sheet processing apparatus according to claim 1, wherein the retracted position of the moving cam is a position where the cam follower is engaged with the first claw closing cam surface and the holding cam surface. The reversible sheet processing apparatus according to claim 2, wherein the moving cam is rotatably supported on a swing shaft and is connected to a rotating body that is rotationally driven by a lever.

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