JP3611282B2 - Paper reversing device for duplex printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet reversing device in a duplex printing machine such as a sheet-fed printing machine.
[0002]
[Prior art]
FIG. 5 is a conceptual diagram showing the positional relationship between a reversing cylinder and an impression cylinder in a general duplex sheet-fed printing press, and FIG. 6 is a conceptual side view showing the reversing cylinder.
In a general sheet-fed printing machine, a plurality of printing devices (printing units) with different normal ink colors are arranged in parallel along the traveling direction of the printing paper (sheet-fed paper). A predetermined multicolor printing can be performed by causing each printing apparatus to pass printing paper and sequentially transferring patterns having different ink colors.
[0003]
Therefore, as shown in FIG. 5, a reversing cylinder 53 having the same diameter as these is disposed between an upstream pressure cylinder 51 and a downstream pressure cylinder 52 constituting each printing unit. One intermediate cylinder system is used. The impression cylinders 51 and 52 are pivotally supported by a frame of a printing machine main body (not shown) and are rotated counterclockwise as indicated by an arrow. It is provided at a location that bisects the circumferential direction.
The reversing drum 53 is supported by a frame (not shown) so as to rotate in the clockwise direction indicated by an arrow, and has a suction means 54 having a suction port 54a and a pair of biting claws 55 on its outer peripheral portion. , 56 are rotatably provided at two locations corresponding to the biting claws of the impression cylinders 51, 52. In the suction means 54, when the biting is changed by the biting claws 55, 56 of the reversing body 53, the suction mouth 54 a sucks the paper bottom until the biting claw 55 finishes biting the paper bottom, and the biting is reliably performed. It is provided to do so. Note that the one claw 55 and the other claw 56 are configured to rotate in opposite directions.
[0004]
When double-sided printing is performed using such a sheet-fed printing press, when the printing paper is sent out one sheet at a time from the paper feeder in the previous process, the biting of the upstream impression cylinder 51 provided in the first color printing unit section After being transferred to a nail (not shown), it is rotationally transferred along the outer peripheral surface of the impression cylinder 51, and printing is performed on the surface in the course of this transfer. Subsequently, the printing paper on the upstream impression cylinder 51 is delivered with the paper bottom adsorbed by the suction port 54 a of the adsorption means 54 provided in the reversing cylinder 53. Then, the paper bottom of the printing paper is bitten by one of the nail claws 55 of the reversing drum 53, and the printing paper is reversed by switching to the other biting claw 56. Thereafter, the printing paper is transferred to the downstream impression cylinder 52 of the next printing unit, and the first color is printed on the back surface. Thereafter, when the same operation is sequentially repeated, the target multicolor printing is performed on both sides of the printing paper, and the predetermined printing process is completed.
[0005]
[Problems to be solved by the invention]
However, the above-described conventional sheet reversing device uses the reversing cylinder 53 provided with the suction means 54 in addition to the claw claws 55 and 56 in order to surely change the bite, and the reversing from the upstream pressure cylinder 51 is performed. Since the printing paper is transferred to the cylinder 53 by the suction means 54 first and then transferred to the downstream pressure cylinder 52 through the nail change by the nail claws 55 and 56, the structure becomes complicated and the equipment cost increases. At the same time, there is a problem that maintenance inspection becomes troublesome. Moreover, since the biting claws 55 and 56 of the reversing cylinder 53 are smaller than the other impression cylinders 51 and 52, etc., there are problems in strength and durability, and they are suitable for high-speed operation. There wasn't.
Moreover, since the nail | claws 55 and 56 protrude from the outer peripheral surface of the inversion cylinder 53, when contacting the other impression cylinder, it is necessary to retract. This makes the mechanism more complicated.
[0006]
The present invention has been made in view of such a situation, and its purpose is to simplify the structure, to excel in strength and durability and stability of paper conveyance, and to operate at high speed without damaging the cylinder surface. Another object of the present invention is to provide a sheet reversing device for a duplex printing press suitable for the above-mentioned.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art, the present invention includes a reversing cylinder disposed between the cylinders, and the reversing cylinder first receives and absorbs the paper bottom of the sheet from the upstream cylinder. A suction mechanism, and a second suction mechanism that faces each other and sucks and receives the paper bottom of the paper from the first suction mechanism to change the bite, invert the paper, and pass it to the downstream cylinder It is provided so as to be freely rotatable.
[0008]
In the present invention, the drive mechanism of the first and second suction mechanisms includes a cam fixed to the frame of the printing press body, a cam follower that reciprocates along the outer peripheral surface of the cam, and the cam follower. A sector gear that is swingably attached to the suction port of each of the first and second suction mechanisms, and a gear that meshes with each other. By driving the gear with the sector gear, the suction ports are opposite to each other. It is configured to rotate in the direction.
In the present invention, the drive mechanism of the first and second suction mechanisms is fixed to the frame of the printing press main body, the cam follower that reciprocates along the outer peripheral surface of the cam, and one end of the cam follower. An arm that is pivotally attached to the cam follower and whose other end is pivotally attached to the suction port of the first and second suction mechanisms. By driving the arm, the suction port rotates in opposite directions. It is configured to move.
[0009]
In the present invention, a highly rigid nail that is used at the time of single-sided printing and retracts from the surface of the cylinder at the time of double-sided printing is rotatably provided on the outer peripheral surface of the reversing cylinder.
In the present invention, only the suction port of the first suction mechanism is configured to perform bite change during single-sided printing by preventing rotation.
[0010]
Further, in the present invention, the reversing cylinder is configured as a single intermediate cylinder system disposed between the upstream and downstream impression cylinders.
In the present invention, the reversing cylinder is configured as an odd-numbered intermediate cylinder system of three or more arranged between the upstream and downstream intermediate cylinders.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIG. 1 is an explanatory view showing a basic configuration example of a sheet reversing device of a duplex printing machine according to the first embodiment of the present invention, FIG. 2 is an explanatory view showing an example of an operating state during double-side printing, and FIG. It is explanatory drawing which shows the example of an operation state at the time of single-sided printing.
[0012]
The sheet reversing device according to the first embodiment of the present invention is equipped with a sheet-fed printing machine in which a plurality of printing units 1 and 2 having different ink colors are arranged along the traveling direction of the printing sheet (sheet) 3. Has been. Each printing unit 1, 2 has a plate cylinder 4 with a printing plate mounted on the peripheral surface, an unillustrated inking device and water supply device for supplying ink and water to the plate surface, and an outer peripheral surface below the plate cylinder 4. And a rubber cylinder 5 to which a pattern on the printing plate is transferred. The plate cylinder 4 and the rubber cylinder 5 are formed to have the same diameter. In addition, pressure cylinders 6 and 7 having a diameter twice as large as that of each rubber cylinder 5 are disposed in a state where the rubber cylinder 5 and the outer peripheral surface are in contact with each other. A reversing cylinder 8 having the same diameter as this is disposed between them. Therefore, the printing unit 1 and the next printing unit 2 are connected to each other via the reversing cylinder 8, and the reversing cylinder 8 is configured as a single intermediate cylinder.
The impression cylinders 6 and 7 are pivotally supported by a frame of a printing press main body (not shown) and are configured to rotate counterclockwise as indicated by an arrow A. A plurality of sets of claw devices 9 are provided for switching the printing paper 3 from a cylinder claw or a suction mechanism (described later) of the reversing cylinder 8 and winding it around the cylinder circumferential surface. The claw device 9 is provided at a position that bisects the circumferential direction, and includes a claw claw 10 and a claw seat 11. Further, the biting claw 10 is pivotally supported on a built-up claw shaft 12 so as to open and close the claw device 9 when the biting claw 10 rotates.
[0013]
On the other hand, the reversing cylinder 8 is pivotally supported by a frame of a printing press main body (not shown) and is configured to rotate clockwise as indicated by an arrow B. As shown in FIG. 1, a first suction mechanism 13 that sucks and receives the bottom of the printing paper 3 from the upstream impression cylinder 6 and the printing paper 3 from the first suction mechanism 13 are disposed on the outer periphery of the reversing cylinder 8. A second suction mechanism 14 that performs bite change (paper delivery) by sucking and receiving the paper bottom, and reverses the printing paper 3 and passes it to the downstream impression cylinder 7 is rotatably provided. The first suction mechanism 13 and the second suction mechanism 14 are provided with suction levers 17 and 18 each having suction ports 15 and 16 for sucking the bottom of the printing paper 3.
The first suction mechanism 13 and the second suction mechanism 14 are respectively provided at two positions corresponding to the claw devices 9 of the impression cylinders 6 and 7 at positions that bisect the circumferential direction, and are indicated by arrows C. As described above, the suction levers 17 and 18 having the suction ports 15 and 16 are configured to be rotated in opposite directions by a drive mechanism described later. Further, the suction timing of the suction ports 15 and 16 with respect to the printing paper 3 is performed by a rotary valve (not shown) disposed at the center of the reversing cylinder 8.
For this reason, the base end portions of the suction levers 17 and 18 are integrally attached to the pipe-shaped lever shafts 19 and 20, and the lever shafts 19 and 20 are rotatably supported by the end portions of the reversing cylinder 8. The suction ports 15 and 16 communicate with the inside of the lever shafts 19 and 20 through the communication holes 21 and 22. Accordingly, the suction ports 15 and 16 of the suction levers 17 and 18 are connected to a vacuum pump as an air source via a rotary valve, lever shafts 19 and 20, communication holes 21 and 22, and the like (not shown).
[0014]
The drive mechanism of the first suction mechanism 13 and the second suction mechanism 14 includes one cam 23 fixed to the frame of the printing press main body (not shown), a cam follower 24 reciprocating along the outer peripheral surface of the cam 23, Fan-shaped sector gears 25 that are swingably attached to the cam follower 24 and lever shafts 19 and 20 that are integrated with the suction levers 17 and 18 are fixed coaxially to the pinions (gears) 26 and 27 that mesh with each other. And. The sector gear 25 is pivotally supported at the middle bent portion by the support shaft 28, and the tip tooth portion 25 a is provided at a position where it engages with the pinion 26 of the first suction mechanism 13. Accordingly, the suction ports 15 and 16 of the first suction mechanism 13 and the second suction mechanism 14 face each other via the suction levers 17 and 18 by rotating the pinions 26 and 27 with the cam-driven sector gear 25, or It is set to leave. The pinions 26 and 27 are provided with a mechanism (not shown) for eliminating backlash.
[0015]
Further, on the outer peripheral portion of the reversing drum 8, a nail claw 30 and a claw seat 31 constituting a plurality of sets of claw devices 29 are provided at a location that bisects the circumferential direction. Is used at the time of single-sided printing, and as shown by the chain line in FIG. For this reason, the biting claw 30 is pivotally supported on the installed claw shaft 32 so that the claw device 29 is opened and closed when the biting claw 30 is rotated. Moreover, the claw claw 30 has the same size as the claw claw 10 of the other cylinders, for example, the impression cylinders 6 and 7, and has high rigidity so as to ensure durability and stability of paper conveyance. It has been.
[0016]
When double-sided printing is performed by a sheet-fed press equipped with the sheet reversing device of the first embodiment of the present invention, the nail 30 of the nail device 29 is automatically moved from the outer peripheral surface of the reversing cylinder 8 as shown in FIG. Inverted, retracted, and inactive. In this state, the cylinder phase is switched to match the paper length and the suction position of the first suction mechanism position, and when double-sided printing is started, the printing paper 3 fed one by one from the paper feeding device (not shown) to the printing unit 1 is The nail device 9 of the upstream impression cylinder 6 is bitten and wound around the outer peripheral surface of the impression cylinder 6, and printing is performed on the surface on the rubber cylinder 5 side when passing between the rubber cylinder 5. When each cylinder further rotates and the paper bottom of the printing paper 3 bitten by the claw device 9 of the impression cylinder 6 and the first suction mechanism 13 of the reversing cylinder 8 face each other, the paper of the printing paper 3 on the impression cylinder 6 The suction port 15 of the first suction mechanism 13 adsorbs the buttocks, the nail claw 10 rotates and the nail device 9 rotates, and the nail paper 10 releases the paper. Passed to the side. At the same time, when the pinions 26 and 27 are rotated by the cam-driven sector gear 25, the suction levers 17 and 18 of the first suction mechanism 13 and the second suction mechanism 14 are rotated inward, and the suction ports 15 and 16 are They will face each other. Therefore, the suction by the suction port 16 of the second suction mechanism 14 is started, the suction of the suction port 15 of the first suction mechanism 13 is stopped, the printing paper 3 is replaced by the suction ports 15, 16, and the suction lever 17. , 18 rotate outwardly, and when the suction ports 15, 16 return to the original state, the printing paper 3 is reversed and wound around the outer peripheral surface of the reversing cylinder 8. Thereafter, each cylinder further rotates, and when the second suction mechanism 14 of the reversing cylinder 8 and the nail claw 10 of the claw device 9 of the impression cylinder 7 located on the downstream side face each other, the claw device 9 rotates and bites. While the nail 10 bites the paper, the suction of the suction port 16 of the second suction mechanism 14 is stopped, and the printing paper 3 is transferred to the impression cylinder 7 side. When the printing paper 3 passes between the impression cylinder 7 and the rubber cylinder 5 in the printing unit 2, printing is performed on the back surface on the rubber cylinder 5 side to perform double-sided printing.
[0017]
When performing single-sided printing, as shown in FIG. 3, the nail 30 of the nail device 29 automatically rotates forward and protrudes from the outer peripheral surface of the reversing cylinder 8 and is in an activated state. And the 2nd suction mechanisms 13 and 14 are non-operating. After phase adjustment is performed so that the claw device 29 of the reversing cylinder 8 and the claw devices 9 of the impression cylinders 6 and 7 before and after the reversing cylinder face each other by a phase switching device (not shown), when single-sided printing is started in this state, The printing paper 3 fed one by one from the paper device to the printing unit 1 is bitten by the nail device 9 of the upstream impression cylinder 6 and wound around the outer circumferential surface of the impression cylinder 6 in the same manner as in double-sided printing. 5 is printed on the surface of the rubber cylinder 5 side. When each cylinder further rotates and the nail 10 of the nail device 9 of the impression cylinder 6 and the nail 30 of the nail device 29 of the reversing cylinder 8 face each other, the paper bottom of the printing paper 3 on the impression cylinder 6 Is held by the nail device 30 of the nail device 29, and the nail device 10 is rotated to open and close the nail device 9, so that the printing paper 3 is changed over and delivered to the reversing cylinder 8 side. It is wound around the outer peripheral surface of the trunk 8. Thereafter, when each cylinder further rotates and the nail 30 of the nail device 29 of the reversing cylinder 8 and the nail 10 of the nail device 9 of the impression cylinder 7 located on the downstream side face each other, the nail 10 rotates. The nail device 9 is moved to open and close, and the nail device 30 is also rotated to open and close the nail device 29. Therefore, the printing paper 3 is changed over and delivered to the impression cylinder 7 side. When the printing paper 3 passes between the impression cylinder 7 and the rubber cylinder 5 in the printing unit 2, the second color is printed on the same surface as the first color.
[0018]
As described above, in the paper reversing device according to the first embodiment of the present invention, the first suction mechanism 13 that sucks and receives the paper bottom of the printing paper 3 from the upstream impression cylinder 6 on the outer periphery of the reversing cylinder 8; By sucking and receiving the bottom of the printing paper 3 from the first suction mechanism 13, the bite is changed, and the second suction mechanism 14 that reverses the printing paper 3 and passes it to the impression cylinder 7 on the downstream side is rotated. Since the reversing operation of the printing paper 3 is performed by switching between the suction ports 15 and 16 at the time of duplex printing, the printing paper 3 can be reliably bitten and reversed. In addition, there is nothing that protrudes from the outer peripheral surface of the reversing cylinder 8, and even if there is an operation error such as a phase shift with the impression cylinders 6 and 7, the cylinder surface is not damaged and the printing quality is maintained. Can do. Moreover, the drive mechanism that moves the first and second suction mechanisms 13 and 14 is mainly composed of the cam 23, the cam follower 24, the sector gear 25, and the pinions 26 and 27, and the structure thereof is simplified, so that the strength and durability are improved. It can be operated at high speed.
In addition, the outer periphery of the reversing cylinder 8 of the present embodiment is provided with a nail claw 30 and a nail seat 31 of a nail device 29 that are used during single-sided printing and are reversed and retracted from the cylinder surface during double-sided printing. In addition, since the nail claw 30 has high rigidity and is the same size as that used in other cylinders, it has excellent durability and can stably transport the printing paper 3.
[0019]
FIG. 4 is an explanatory diagram showing a basic configuration example of a sheet reversing device of a duplex printing machine according to a second embodiment of the present invention. The sheet reversing device of the present embodiment is different from the paper reversing device of the first embodiment in the driving mechanisms of the first and second suction mechanisms 13 and 14.
That is, the drive mechanism of the present embodiment includes two cams 23 and 33 fixed to a frame of a printing press main body (not shown), a cam follower 24 that reciprocates along the outer peripheral surface of the cams 23 and 33, and the cam follower 24. The fan-shaped sector gear 25 is swingably attached to each other, and the pinions 26 and 27 are coaxially fixed to the lever shafts 19 and 20 integrated with the suction levers 17 and 18, respectively. That is, in the second embodiment, two sets of cams 23, 33, sector gears 25, etc. are provided, the pinions 26, 27 are not meshed with each other, and the first suction mechanism 13 and the second suction mechanism 14 are independent of each other. It is comprised so that it may drive. Each sector gear 25 is pivotally supported by a bent portion in the middle by a support shaft 28, and its tip tooth portion 25 a is provided at a position where it meshes with the pinions 26, 27 of the first and second suction mechanisms 13, 14. . Accordingly, the suction ports 15 and 16 of the first suction mechanism 13 and the second suction mechanism 14 face each other via the suction levers 17 and 18 by rotating the pinions 26 and 27 with the cam-driven sector gear 25, or It is set to leave. Other configurations, operations, and printing operations are the same as those in the first embodiment.
In the present embodiment, the sector gear 25 and the pinions 26 and 27 similar to those in the first embodiment are used as the drive mechanisms for the first and second suction mechanisms 13 and 14, but one end is rotatably attached to the cam follower 24. The other ends of the suction levers 17 and 18 or the lever shafts 19 and 20 are attached to the lever shafts 19 and 20, respectively. You may comprise so that it may rotate to an opposite direction.
[0020]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope of the present invention. is there.
For example, in the above-described embodiment, the nail device 29 used only at the time of single-sided printing is provided on the outer periphery of the reversing cylinder 8 to change the bite of the printing paper 3, but the nail device 29 is not provided. Only the first suction mechanism 13 may be configured to change the bite during single-sided printing by preventing the suction port 15 of the suction lever 17 from rotating. In the above-described embodiment, the reversing cylinder 8 is disposed between the upstream and downstream impression cylinders 6 and 7, and an intermediate cylinder is further provided between the reversing cylinder 8 and the impression cylinders 6 and 7. It is also possible to configure an odd-numbered intermediate cylinder system of three or more arranged.
[0021]
【The invention's effect】
As described above, the sheet reversing device of the duplex printing press according to the present invention includes the reversing cylinder disposed between the cylinders, and the reversing cylinder attracts and receives the paper bottom of the sheet from the upstream cylinder. A first suction mechanism, a second suction mechanism that faces each other's suction ports and sucks and receives the paper bottom of the paper from the first suction mechanism to perform bite switching, and reverses the paper and passes it to the downstream cylinder Since the structure of the drive mechanism for moving the first and second suction mechanisms is simpler than that of the nail device, the strength and durability are improved, and the printing machine can be operated at high speed. In addition, the printing quality can be improved without damaging the cylinder surface even if there is an operation error such as a phase shift.
[Brief description of the drawings]
FIG. 1 is a conceptual side view illustrating a basic configuration of a sheet reversing device of a duplex printer according to a first embodiment of the present invention.
FIG. 2 is a conceptual side view for explaining the sheet reversing device of the duplex printing machine according to the first embodiment of the present invention and showing an operating state at the time of duplex printing.
FIG. 3 is a conceptual side view illustrating the sheet reversing device of the duplex printing machine according to the first embodiment of the present invention and illustrating an operating state during single-sided printing.
FIG. 4 is a conceptual side view illustrating a basic configuration of a sheet reversing device of a dual-sided printing press according to a second embodiment of the present invention.
FIG. 5 is a conceptual diagram showing an arrangement relationship between a reversing cylinder and an impression cylinder in a general double-sided sheet-fed printing press.
FIG. 6 is a conceptual side view showing a conventional inversion cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 Printing unit 3 Printing paper 6, 7 Pressure cylinder 8 Reversing cylinder 9 Claw device 10 Claw nail 11 Claw seat 12 Claw shaft 13 First suction mechanism 14 Second suction mechanism 15, 16 Suction port 17, 18 Suction lever 19, 20 Lever shafts 21, 22 Communication holes 23, 33 Cam 24 Cam follower 25 Sector gears 26, 27 Pinion 28 Support shaft 29 Claw device 30 Claw claw 31 Claw seat 32 Claw shaft

Claims (7)

A reversing cylinder disposed between the cylinders; a first suction mechanism that sucks and receives the paper bottom of the paper from the upstream cylinder; and a sheet from the first suction mechanism facing each other . Paper for double-sided printing press characterized in that it is reversibly bitten by sucking and receiving the paper bottom of the paper, and a second suction mechanism that inverts the paper and passes it to the downstream cylinder is rotatably provided Inversion device. The drive mechanisms of the first and second suction mechanisms are attached to one cam fixed to the frame of the printing press main body, a cam follower that reciprocates along the outer peripheral surface of the cam, and swingable to the cam follower. A sector gear and gears respectively provided at the suction ports of the first and second suction mechanisms and meshing with each other are provided, and by driving the gear with the sector gear, the suction ports are rotated in opposite directions to each other. The paper reversing device for a duplex printing press according to claim 1, wherein the paper reversing device is configured. The drive mechanism of the first and second suction mechanisms includes two cams fixed to the frame of the printing press main body, a cam follower that reciprocates along the outer peripheral surface of these cams, and one end pivotable to the cam follower. An arm attached to the suction port of the first suction mechanism and the second suction mechanism so that the other end of the suction mechanism is rotatable. The arm is driven to rotate the suction port in opposite directions. The paper reversing device for a duplex printing machine according to claim 1, wherein the paper reversing device is a double-sided printing press. 2. The double-sided according to claim 1, wherein a highly rigid nail that is used during single-sided printing and is retracted from the surface of the cylinder during double-sided printing is rotatably provided on the outer circumferential surface of the reversing cylinder. Paper reversing device for dual-purpose printers. 2. The sheet reversing device for a duplex printing press according to claim 1, wherein only the first suction mechanism is configured to change the bite during single-sided printing by preventing rotation of the suction port. 2. The sheet reversing apparatus for a duplex printing press according to claim 1, wherein the reversing cylinder is configured as a single intermediate cylinder disposed between upstream and downstream impression cylinders. 2. The sheet reversing apparatus for a duplex printing press according to claim 1, wherein the reversing cylinder is configured in an odd number of intermediate cylinders of 3 or more disposed between upstream and downstream intermediate cylinders.

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