JP2590236Y2 - Print switching device for sheet-fed rotary printing press with reversing mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention has a reversing cylinder disposed between an upstream cylinder and a downstream cylinder in the paper transport direction, and enables one-sided printing and two-sided printing with one machine. The present invention relates to a printing switching device for switching a paper holding mechanism and the like between a single-sided printing state and a double-sided printing state in a sheet-fed rotary printing press with a reversing mechanism.

[0002]

2. Description of the Related Art With the diversification of printing, various types of sheet-fed rotary printing presses with a reversing mechanism, which can perform single-sided printing and double-sided printing with a single machine, have been proposed and put into practical use. A sheet-fed rotary printing press equipped with a reversing mechanism including a double-diameter pressure cylinder on the upstream side with respect to the paper transport direction, a double-diameter pressure cylinder on the downstream side, and a double-diameter reversing cylinder disposed between the two cylinders. US Patent 4343
No. 241, which will be described below.

FIG. 9 is a cylinder arrangement diagram of a sheet-fed rotary printing press with a reversing mechanism disclosed in this publication in a double-sided printing state. This will be described with reference to FIG.
For example, the first printing unit 1 and the second printing unit 2 are provided with a plate cylinder 3 on which a printing plate is mounted and a blanket cylinder 4 on which a blanket is wound so as to face each other. The blanket cylinder 4 of the unit 1 is provided with a double-diameter impression cylinder 5 which is a cylinder on the upstream side with respect to the paper transport direction.

The blanket cylinder 4 of the printing unit 2 is provided with a double-diameter impression cylinder 6 which is a cylinder on the downstream side in the paper transport direction, and is provided between the impression cylinder 5 and the impression cylinder 6. Is provided with a double-diameter reversing cylinder 7 whose peripheral surface is in contact with both pressure cylinders 5 and 6.

[0005] A plurality of sets of gripper devices 8 (hereinafter referred to as gripper devices) composed of a claw and a claw base and opened and closed by a cam mechanism are provided at portions where the outer peripheral portion of the impression cylinder 5 is equally divided in the circumferential direction. Are simply provided in parallel in the axial direction of the impression cylinder 5, and a plurality of sets that are opened and closed by a cam mechanism are provided at portions where the outer peripheral portion of the impression cylinder 6 is divided into two equal parts in the circumferential direction. Claws 9 are provided in parallel in the axial direction of the impression cylinder 6.

Further, the outer peripheral portion of the reversing cylinder 7 is circumferentially
Inverted claws 10 which are opened and closed by a cam mechanism,
A plurality of suction ports 11 connected to a suction air source such as a pump (not shown) are provided in parallel with each other in the axial direction of the reversing cylinder 7 in close proximity to each other. The position is set so that 10 corresponds to the claw 8 and also corresponds to the claw 9 by the rotation of the trunks 5, 6, 7. In the case of double-sided printing shown in the figure, the paper butt of the paper 12 held by the claws 8 by the rotation of the cylinders 5, 6, 7
And its position is set such that the reversing claw 10 and the claw 9 correspond.

With this configuration, in the case of the double-sided printing shown in the figure, when each of the cylinders 5, 6, and 7 rotates, the paper 12 held by the claw 8 and conveyed is attached to the blanket cylinder 4. The paper 12 is printed on its surface when passing between the impression cylinder 5 and the paper 12 passes through the pair of contacts of the two cylinders 5 and 7 without being held by the reversing claw 10 at the gripping end. Is wound around the lower peripheral surface.

When the paper butt of the wound paper 12 reaches the point of contact between the two cylinders 5 and 7, the paper butt is sucked by the suction port 11 and transported, and the gripping end is released from the grip of the claw 8 during the transport. Is done. The paper 12 sucked into the suction port 11 is turned over by being replaced by the reversing claw 10 and conveyed, and turned over. The reversing claw 10 is further replaced by the claw 9 and conveyed by the impression cylinder 6. When the paper 12 to be conveyed passes between the blanket cylinder 4 and the impression cylinder 6, printing is performed on the back surface to form double-sided printing.

When switching from double-sided printing to single-sided printing, the claw 8 of the impression cylinder 5 corresponds to the reversing claw 10 of the reversing cylinder 7 so that the upstream cylinder group including the impression cylinder 5 with respect to the paper conveyance direction can be used. Adjust the phase. When the cylinders 5, 6, 7 and the like rotate in this state, the paper 12 conveyed in addition to the claws 8 has the first color when passing between the blanket cylinder 4 and the impression cylinder 5 of the printing unit 1. The paper 12 is moved from the nail 8 to the inverted nail 1.
It is conveyed while being wound around the lower peripheral surface of the reversing cylinder 7 after being changed to 0. The wound paper 12 is
From the printing unit 2
When passing between the blanket cylinder 4 and the impression cylinder 6, the second color printing is performed on the same surface as before.

A sheet-fed rotary printing press equipped with a reversing mechanism having double-diameter impression cylinders 5 and 6 and a reversing cylinder 7 operating as described above includes a cam mechanism for opening and closing a reversing claw 10 as a paper holding mechanism, A plurality of cam mechanisms are provided, such as a cam mechanism for moving the suction port 11 as a paper holding mechanism between an operating position and a retracted position, and a cam mechanism for moving the claw base of the reversing claw 10 up and down. When switching between printing and single-sided printing, the operating positions of these cam mechanisms must be moved to predetermined positions.

[0011]

However, in the above-described conventional sheet-fed rotary printing press with a reversing mechanism, these cam mechanisms are provided on the operating frame supporting the reversing cylinder 7 and the driving frame on the opposite side. When switching between double-sided printing and single-sided printing, the operator must move between the operation side and the driving side of the machine to perform the switching operation, so workability is poor and printing switching time is poor. However, there is a problem that the operating rate of the machine is reduced due to the extension of the operation time.

The present invention has been made in view of the above points, and has been made in consideration of the above points. Sheet-fed rotary printing with a reversing mechanism that enables improved workability when switching between double-sided printing and single-sided printing and shortens the printing switching time. The purpose of the present invention is to provide a printing switching device for a printing machine.

[0013]

According to the present invention, in order to achieve the above object, the present invention is applied to a reversing cylinder which is arranged between the two cylinders with the peripheral surfaces thereof opposed to each other. A paper holding mechanism that holds the leading edge of the paper and transfers it to the downstream cylinder during duplex printing, holds the paper butt of the paper wrapped around the upstream cylinder, reverses this paper, and transfers the paper to the downstream cylinder. And a plurality of cams for operating the paper holding mechanism, wherein at least two of the plurality of cams are movable cams movably supported on a frame side. And moving means for moving these moving cams together.

Further, in the invention according to the second aspect, the printing apparatus is attached to a reversing cylinder which is disposed between the two cylinders so that the peripheral surfaces thereof are in contact with each other. During duplex printing on the side cylinder, the paper holding mechanism that holds the paper butt of the paper wound on the upstream cylinder and turns over the paper while transferring it to the downstream cylinder, and activates the paper holding mechanism In a sheet-fed rotary printing press with a reversing mechanism including a plurality of cams, at least two of the plurality of cams are
The moving cams are movably supported on the frame side, and these moving cams are moved between an operating position that regulates the operation of the paper holding mechanism during double-sided printing and a retracted position that retreats from the operating position during single-sided printing. A moving means for moving at once is provided.

According to a third aspect of the present invention, there is provided a print switching device for a sheet-fed rotary printing press with a reversing mechanism according to the first or second aspect, and a detector for detecting a position of a moving cam, and the detector. And a moving device controlled by the control unit to move a plurality of moving cams at the same time.

[0016]

When switching between double-sided printing and single-sided printing, when the moving means is operated, a plurality of moving cams for operating a paper holding mechanism for holding the paper received from the upstream cylinder and transferring it to the downstream cylinder are provided. , Move together.

In the invention of claim 2, when switching between double-sided printing and single-sided printing, when the moving means is operated, the plurality of moving cams move at the same time between the operating position and the retracted position.

In the invention according to the third aspect, when switching between double-sided printing and single-sided printing, when the moving means is operated, the plurality of moving cams move at the same time, and the position of the moving cam is detected by the detector and the moving cam is detected. Control movement.

[0019]

1 to 8 show an embodiment of a sheet-fed rotary printing press with a reversing mechanism according to the present invention. FIG. 1 is an exploded cross-sectional view of the vicinity of an operation side frame which supports a reversing cylinder shown in a single-sided printing state. 2, FIG. 2 is a front view of the reversing cylinder seen in the II-II direction of FIG. 1, FIG. 3 is a developed cross-sectional view of the vicinity of a driving side frame that supports the reversing cylinder shown in a single-sided printing state, and FIG. FIG. 5 is a front view of the reversing cylinder as viewed in the direction IV, FIG. 5 is a front view of the reversing cylinder as viewed in the direction II-II of FIG. 1 shown in a double-sided printing state, and FIG. FIG. 7 is a front view of a claw, a claw base, and a mouthpiece, FIG. 7 is a cross-sectional view of an outer peripheral cutout portion of the reversing cylinder, and FIG. 8 is a side view of the vicinity of the reversing cylinder shown for explaining operations of the suction port and the reversing claw.

In the drawing, a rolling bearing 23 is fitted in an inner hole of a bearing holder 22 fitted in a bearing hole 21a of a frame 21 on the operating side, and a bearing hole 24a of a frame 24 on the driving side. A rolling bearing 26 is fitted in the inner hole of the bearing holder 25 fitted in the bearing holder 25. Reference numeral 27 denotes a double-diameter reversing cylinder whose left and right end shafts 27a and 27b are rotatably supported by the rolling bearings 23 and 26, and the reversing cylinder 27 is screwed to the end shafts 27a and 27b. The movement in the axial direction is restricted by tightening the screwed nut 28.

The bearings provided on the left and right frames 21 and 24, on which the reversing cylinder 27 is pivotally supported, are provided with the cylinder on the upstream side in the rotation direction of the cylinder indicated by the arrow in FIG. A first impression cylinder 29 of a certain diameter and a second impression cylinder 30 of the same diameter, which is also a downstream cylinder, are rotatably supported on both end shafts. Body 2
It is located between 9, 30 and its peripheral surface is provided in contact with these impression cylinders 29, 30. 31 and 32 are impression cylinders 29 and 30
And the left and right frames 21 and 24
This is a blanket cylinder that is rotatably supported on the cylinder.

As shown in FIG. 8, a notch provided at a position where the outer peripheral portion of the first impression cylinder 29 is divided into two in the circumferential direction includes a claw and a claw base. A plurality of sets of claws (only one is shown in the figure) are juxtaposed in the axial direction, and a notch is provided at a location that divides the outer peripheral portion of the second impression cylinder 30 into two equal parts in the circumferential direction. Inside, a plurality of sets of claws (only one is shown in the figure), which are composed of claws and a claw base and are generally indicated by reference numeral 90, are arranged side by side in the axial direction.

6 and 7, a notch 2 whose both ends are closed by a disk-shaped bearer 33 is provided on the outer peripheral portion of the reversing cylinder 27.
7a, a bearing fixed to the bottom surface of the notch 27a and a bearing fixed to the bearer 33 are provided with a drive shaft 34 having both ends protruding from the bearer 33 to be rotatably supported. Have been. Further, a drive lever 35 is fixed to one end of the drive shaft 34, and a connecting lever 37 is connected to the other end of the drive rod 36 whose one end is pivotally connected to the free end of the drive lever 35. It is pivotally mounted.

On the other hand, the bearings provided on the left and right bearers 33 are provided with rotatable shafts 39 at both ends of a claw bar 38 formed in an elongated bar shape via rolling bearings. A plurality of pawls 40 are arranged in a notch provided at one swing end of the pawl bar 38, and the connecting lever 37 is connected to an opposite pawl 40 of the pawl bar 38. Pivotally attached to the free end of the side.

Numeral 41 denotes a torsion bar inserted through an inner hole provided in the claw bar 38 and an inner hole of both end shafts 39. The torsion bar 41 is a hexagon of a not-shown torsion bar holder. One end is fixed by fitting one hexagonal head into the hole, and the other hexagonal head of the torsion bar 41 is a hexagonal head provided at the other end of the rotatable claw bar 38. It is fitted in the hole.

By doing so, the claw bar 38 is urged in the upright direction indicated by the solid line in FIG. 6 by the torsion spring force accumulated in the torsion bar 41, and its rotation limit is regulated by a stopper (not shown). Have been. A compression coil spring 42 for urging the claw bar 38 in the upright direction is interposed between the claw bar 38 and the spring receiver on the bearer 33 side.

Next, the claws constituting the gripper device together with the claw base 40 will be described. A bearing provided on the left and right bearers 33 positioned diagonally below the claw base 40;
The plurality of bearings fixed to the bottom surface of the notch 27a in parallel in the axial direction of the notch 27 have a pawl shaft 43 rotatably supported thereon. Holders 44 are fixed in parallel in the axial direction, and a plurality of claws 45 for holding paper between the claw holders 40 are respectively fixed to each claw holder 44 corresponding to each claw base 40. .

A hexagonal hole (not shown) of a torsion bar holder (not shown) fixed to one of the bearings supporting the claw shaft 43 so as to be rotatable in the circumferential direction is provided with a torsion penetrating through the inner hole of the claw shaft 43. A hexagonal head formed at one end of the bar 46 is fitted and fixed. A hexagonal head formed at the other end of the torsion bar 46 fits into a hexagonal hole formed at one end of the claw shaft 43. Have been. As a result, the nail 45 becomes the torsion bar 4
The torsion spring force of No. 6 urges the paper in the opening direction to release the grip of the paper as shown by a chain line 45b in FIG. Claw 45
The entire claw device including the claw base 40 and the like is referred to as a claw, and FIG.
At 100.

Reference numeral 47 denotes a suction port which is connected to the suction air source via an air passage via a rotary valve, and is supported by a swingable suction lever (not shown). To each of the annular cam holders 48 fixed to the 22 and 25 with a plurality of bolts, an annular mouthpiece rotating cam 49 having a cam surface on the outer periphery is fixed. Further, a suction port moving cam 51 having a cam surface on the outer periphery is fixed to each of the annular cam holders 50 fixed to the left and right frames 21 and 24 with a plurality of bolts.

The cam follower 52 on the lever with a roller connected to the suction port 47 via a transmission member (not shown) composed of, for example, a segment gear, is urged by a spring member to contact the outer peripheral cam surface of the suction port rotation cam 49. It is crimped,
A cam follower 53 pivotally attached to a suction lever (not shown) that supports the suction mouth 47 is urged by a spring member and pressed against the outer peripheral cam surface of the suction moving cam 51.

With this arrangement, when the impression cylinders 29 and 30 and the reversing cylinder 27 rotate, the suction opening cam 47 and the suction moving cam 51 press the cam followers 52 and 53 against each other so that the suction opening 47 is moved. 8, the paper indicated by reference numeral 110 is sucked and reciprocated in the forward and reverse directions by a predetermined angle.
The paper 110 received from the impression cylinder 29 by rotating around the outer periphery of the reversing cylinder 27 while moving in the radial direction and the circumferential direction of the
It is configured to convey toward zero.

The suction-port rotating cam 49 and the suction-port moving cam 5
1 is a cam follower 52 pressed against the cam surface.
A push-up member (not shown) that pushes up the 53 so as to separate from the large-diameter portion of the cam surface is provided. By operating this push-up member at the time of single-sided printing, the cam follower 52, The configuration is such that the cam 53 does not touch these cam surfaces, and the suction port 47 stands still in a state of being immersed inside the peripheral surface of the reversing cylinder 27.

Next, a cam mechanism for operating the claw 45 and the claw base 40 will be described. On the cam holder 50 fixed to the operation side frame 21, a claw opening / closing fixed cam 54 formed in an annular shape having an L-shaped cross section is positioned and fixed with a plurality of bolts. Code 5
4a and 54b, the outer circumferential cam surface is divided into a large diameter portion 54c and a small diameter portion 5c.
4d.

As shown in FIG. 6, the pawl opening / closing fixed cam 54
The cam follower 56 at the free end of the lever 55 with rollers fixedly fastened to the pawl shaft 43 is pressed against the outer peripheral cam surface by the spring force of the torsion bar 46, and when the reversing cylinder 27 rotates in this state, The action of the cam surface composed of the large diameter portion 54c and the small diameter portion 54d and the spring force of the torsion bar 46 cause the pawl 45 to move to the closed position indicated by the solid line 45a in FIG.
It is configured to move between an open position indicated by.

Further, an annular large gear 57 which is rotated by a driving device which will be described later at the time of printing switching is rotatably fitted to the boss portion of the pawl opening / closing fixed cam 54.
A nail opening / closing surface having an outer peripheral cam surface including a small-diameter portion 58a having the same diameter as the large-diameter portion 54c of the fixed cam 54 and a large-diameter portion 58b having a diameter larger than the large-diameter portion 54c of the fixed cam 54 on the inner surface of the fixed cam 54. The moving cam 58 is fixed with a plurality of bolts.

The cam follower 56 is provided on the outer peripheral cam surface of the pawl opening / closing moving cam 58 with the torsion bar 46.
When the reversing cylinder 27 rotates in this state, the action of the cam surface composed of the large-diameter portion 58b and the small-diameter portion 58a and the spring force of the torsion bar 46 cause the pawl 45 to move in a solid line in FIG. It is configured to move between an operating position indicated by 45a and a retracted position indicated by a chain line 45c.

Further, an annular cam holder 59 having an L-shaped cross section is integrally fixed to the cam holder 50 fixed to the driving frame 24, and a small-diameter step portion of the cam holder 59 has an annular shape. Large gear 6 formed on
0 is rotatably fitted. And this big gear 6
An arc-shaped claw base upper / lower cam 61 having an inner peripheral cam surface having a mountain portion 61a is fixed to the inner surface of the outer peripheral portion of the “0” with a plurality of bolts.

A roller-equipped lever 62 fixed to the drive shaft 34 is provided on the inner peripheral cam surface of the claw base vertical cam 61.
The cam follower 63 at the free end is pressed by the spring force of the torsion bar 41, and when the reversing cylinder 27 rotates in this state, the action of the inner peripheral cam surface having the peak 61 a and the spring force of the torsion bar 41, The claw bar 38 swings and the claw 4
0 is the operating position shown by the solid line 40 in FIGS.
It is configured to move between the evacuation positions indicated by.

Next, a driving device for simultaneously rotating the left and right large gears 57 and 60 will be described. That is, a motor 65 connected to a control device (not shown) is fixed to the bracket 64 fixed to the operation-side frame 21, and the motor 65 is connected to a motor shaft of the motor 65 by a coupling 66, and A worm 68 is mounted on a shaft supported by the bracket 67.

A drive shaft 70 is fixed to both ends of the bearing 69 fitted in the holes of the left and right frames 21 and 24.
A worm wheel 71 meshing with the worm 68 is mounted on the shaft. Small gears 72 and 73 that mesh with the left and right large gears 57 and 60 are mounted on both ends of the drive shaft 70, respectively.

Thus, when the motor 65 rotates, the drive shaft 70 rotates at a low speed via the worm 68 and the worm wheel 71, and the large gears 57, 60 on the left and right are meshed with the small gears 72, 73. At the same time, the pawl opening / closing moving cam 58 on the operation frame 21 side and the driving frame 24
The side claw vertical cam 61 is configured to move simultaneously. In this embodiment, the number of teeth of the small gear 72 is made larger than the number of teeth of the small gear 73 so that the reduction ratio of the operation side gear is made smaller than the reduction ratio of the driving side gear. In this example, the moving amount of the pawl opening / closing moving cam 58 is smaller than the moving amount of the pawl base vertical cam 61. However, the ratio of the moving amount can be freely set by changing the setting of the reduction ratio. Can be.

Further, a pair of sensors 76 and 77 are fixed to the operation side frame 21 in parallel in the thickness direction of the large gear 57. The dog 74 facing only the gear 76 and the dog 75 facing the two sensors 76 and 77 at the same time during double-sided printing because the size of the large gear 57 in the thickness direction is thicker than the dog 74 have a phase of about 90 ° in the circumferential direction. Fixed incorrectly.

Thus, as shown in FIG. 1, only the sensor 76 faces the dog 74 and the large gear 57,
When switching from the one-sided printing state in which the stationary 60 is stationary to the two-sided printing state, when the motor 65 rotates in the forward direction according to a command from the control device, the large gear 57 through the drive shaft 70 and the small gears 72 and 73. , 60 rotate counterclockwise in FIGS. 2 and 5, and as shown in FIG.
The rotation of the large gears 57, 60 is stopped at a position opposing the gear 7.

When switching from the double-sided printing state to the single-sided printing state, the motor 6 is controlled by a command from the control device.
When the gear 5 rotates in the opposite direction, the large gears 57 and 60 rotate clockwise in FIGS. 2 and 5 from the state shown in FIG. 5 via the drive shaft 70 and the small gears 72 and 73. , The rotation of the large gears 57 and 60 is stopped at a position where only the dog 74 faces the sensor 76.

As described above, the sensors 76 and 77 are
5 is controlled. That is, when switching from single-sided printing to double-sided printing, since only the sensor 76 detects the dog 74 in single-sided printing, when a control signal (not shown) receives the detection signal, it issues a drive signal to the motor 65 and outputs a large gear. When both sensors 76 and 77 detect the dog 75, the motor 65 is stopped. When switching from double-sided printing to single-sided printing, the motor 65 is rotated in the opposite direction from the double-sided printing state, and the large gears 57 and 60 are moved until only the sensor 76 detects the dog 74 in FIGS. Rotate 5 clockwise.

In FIG. 1, reference numeral 78 denotes an actuator which is connected to the control device and fixed to the operation side frame 21, and whose working end of the piston rod is in contact with the plane of the large gear 57. When the large gear 57 is stopped, the operation end of the piston rod is pressed against the large gear to stop the rotation of the large gear 57.

The double-sided printing operation of the sheet-fed rotary printing press with the reversing mechanism configured as described above will be described. That is, as shown in FIG. 5, the motor 65 is stopped with the dog 75 facing the sensors 76 and 77, and the large gears 57 and 60 are stationary. In this state, when each cylinder rotates in the direction of the arrow, the paper 110 conveyed by being wound around the claw 80 of the double-diameter first impression cylinder 29 which is the cylinder on the upstream side in the paper conveyance direction and wound around the cylinder. Is wound around the lower peripheral surface of the impression cylinder 29 without being released from the grip of the claw 80 even after the gripping end reaches the contact point of the two cylinders 29, 27.

When the paper butt of the paper 110 wound in this way reaches the point of contact between the two cylinders 29 and 27, that is, the suction opening 47 reaches a line connecting the center of the impression cylinder 29 and the center of the reversing cylinder 27. Then, the pump sucks the atmosphere from the suction port, and the paper bottom is sucked into the suction port 47.

With the suction opening 47 sucking the bottom of the paper, the reversing cylinder 2
7 continue rotating, and the cam followers 52, 5 on the reversing cylinder 27 side.
3 is a suction rotary cam 4 fixed to the frames 21 and 24.
When the nozzle 47 rotates while being pressed against the outer peripheral cam surface of the suction port moving cam 51 and the suction port moving cam 51, the suction port 47 rotates by the action of the suction port rotation cam 49 and moves in the circumferential direction of the reversing cylinder 27, and the rotation of the reversing cylinder 27. As a result, the contact position of the cam follower 53 with respect to the suction moving cam 49 is moved, and the suction opening 47 moves in the radial direction of the reversing cylinder 27 and swings out of the peripheral surface of the reversing cylinder 27 via swinging of an up / down lever (not shown). As a result, by the combined movement with the movement in the circumferential direction, the suction opening 47 rotates around the outer circumferential surface of the reversing cylinder 27 while rotating in the clockwise direction in the drawing as shown by reference numerals 47A to 47G in FIG. .

In this way, the suction opening 47 moves to the position indicated by the reference numeral 47G while holding the bottom of the paper.
Is turned upside down. In addition, the suction opening 47 is provided on both trunks 29 and 2.
7 until the bottom of the paper is sucked at the contact point of No. 7
Is closed and does not release the paper 110 from the mouth,
At the same time as the suction opening 47 sucks the trailing edge of the paper 110, the claw 80 opens to release the paper 110 from the grip.

When the reversing cylinder 27 rotates and the suction port sucking the paper 110 reaches the position indicated by reference numeral 47G, the suction of the air from the suction port 47 is cut off by the action of the rotary valve, and the paper 11 is stopped.
The adsorption of 0 is released. At the same time, the cam follower 56
Moves from the small-diameter portion 54d to the large-diameter portion 54c of the claw opening / closing fixed cam 54 against the torsion spring force of the torsion bar 46, so that the claw 45 moves from the position indicated by the reference numeral 45b to the position indicated by the reference numeral 45a in FIG. Then, the paper 110 released from the suction by the suction port 47 is held by the gripping surface of the claw 100.

When the reversing cylinder 27 further rotates and the pawl 100 faces the pawl 90 of the impression cylinder 30, the pawl 10
0 and the claws 90 of the impression cylinder 30 are opened and closed to change the grip of the paper 100, and the paper 110 is printed on the back surface while being conveyed while being gripped by the claws of the impression cylinder 30.

On the other hand, after passing the paper 110 to the claw 100 at the position indicated by the reference numeral 47G, the suction opening 47 rotates approximately 90 ° until it reaches the point of contact between the two barrels 27 and 30, and
Since it moves in the radial direction so as to be immersed in the peripheral surface of the reversing cylinder 27, the suction port 47 does not interfere with the peripheral surface of the impression cylinder 30.

When the reversing cylinder 27 rotates further, the suction port 47
Moves from the point of contact of the two bodies 30, 27 to the point of contact of the two bodies 27, 29. In the meantime, the suction port 47 is rotated by approximately 360 ° by the suction port turning cam 49, and the reversing cylinder 27 is rotated.
, And moves over the claw 100 by the action of the suction port moving cam 51, and moves in the radial direction of the reversing cylinder 27 so as to protrude and retract from the peripheral surface of the reversing cylinder 27.

In such a double-sided printing operation, the nail 4
5 is immersed in the peripheral surface of the reversing cylinder 27 in order to avoid interference with the impression cylinder 29. That is, when the claw 100 comes close to a line connecting the center of the impression cylinder 29 and the center of the reversing cylinder 27,
The cam follower 56 has a large diameter portion 54 of the claw moving cam 54 against the spring force of the compression coil spring 42 and the torsion bar 39.
c to the small-diameter portion 54d, so that the claw bar 38
The lever 40 swings via the roller-equipped lever 62, the drive shaft 34, the drive rod 35, and the connection lever 36, and the claw base 40 is moved as shown in FIGS.
To the evacuation position indicated by the dashed line.

Following the movement of the claw base 40 to the retracted position, the cam follower 56 moves to the large-diameter portion 58a of the claw opening / closing moving cam 58 against the torsion spring force of the torsion bar 46, and the claw holder 44 swings. And the claw 45 is denoted by reference numeral 45c in FIG.
Since it moves to the position shown by the arrow and sinks from the peripheral surface of the reversing cylinder 27, it does not interfere with the peripheral surface of the impression cylinder 29.

Further, when the reversing cylinder 27 rotates and the pawl 100 passes over a line connecting the centers of the two cylinders 27 and 29, the cam follower 56 is driven by the torsion spring force of the torsion bar 46 to make the large-diameter portion 58b of the pawl opening / closing moving cam 58 large. From the retracted position indicated by reference numeral 45c in FIG. 6 to the reference numeral 45b.
Move to the open position indicated by.

Following the movement of the claw 45, the cam follower 63 swings due to the cooperation between the spring force of the compression coil spring 42 and the torsion bar 39 and the height of the cam surface of the claw moving cam 54. Since the movement of the claw bar 38 toward the claw 45 is restricted by abutting on a stopper (not shown), the claw base 40 moves from the retracted position indicated by a chain line 40a in FIG.

When the reversing cylinder 27 rotates further, the suction port 47
Reaches the position indicated by reference numeral 47G in FIG.
Since the cam follower 56 moves to the small-diameter portion 58c of the pawl opening / closing cam 58 by the torsion spring force of the torsion bar 39, the pawl 45 moves to the position indicated by reference numeral 45a in FIG. And the claw 45 and the claw surface. Paper 110 by this reversing claw 100
Since the stop bar (not shown) is positioned and fixed on the line of action of pressing the claw 45 against the claw base 40 during the grip, the bending of the claw bar 38 is regulated, and the grip can be changed accurately.

When the specification of the printed material is changed and double-sided printing is switched to single-sided printing, first, a push-up member (not shown) is operated to operate the cam follower 52 pressed against the cam surfaces of the suction-port rotating cam 49 and the suction-moving cam 51. , 53 are lifted so as to be separated from the large-diameter portion of the cam surface, even if the reversing cylinder 27 rotates, the cam followers 52, 53 do not touch these cam surfaces, and the suction port 47 is positioned inside the peripheral surface of the reversing cylinder 27. Since it stands still in the immersed state, the suction opening 47 does not interfere with the peripheral surfaces of the impression cylinders 29 and 30.

Next, the upstream cylinder group including the impression cylinder 29 is rotated with respect to the reversing cylinder 27 so that the circumferential surface moves by the length of the paper 110 in the vertical direction, and the claws 80 of the upstream impression cylinder 29 are rotated. And the claw 100 of the reversing cylinder 27 are adjusted in phase. Thereafter, the motor 65 is rotated by a command from the control device, and the left and right large gears 57, 60 are simultaneously rotated clockwise in FIG. 5 from the state shown in FIG. 5 via the drive shaft 70 and the small gears 72, 73. Therefore, only the sensor 76 detects the dog 74 fixed to the large gear 57 and sends a signal to the motor 65 to stop it, whereby the rotation of the large gears 57 and 60 is stopped. By the rotation of the large gears 57 and 60, the claw opening / closing moving cam 58 on the operation frame 21 side fixed thereto and the claw base vertical cam 61 on the driving frame 24 side simultaneously move.

In this way, printing is started in the single-sided printing state,
When each of the cylinders 29, 27, 30, and the like rotates, the paper 110 conveyed by the pawl 80 holds the first color when passing between the blanket cylinder 31 and the impression cylinder 29 of the first printing unit 1. The paper 110 is printed, and the paper 110 is moved from the nail 80 to the inverted nail 100.
In addition, it is conveyed while being wound around the lower peripheral surface of the reversing cylinder 27. The wound paper 110 is the inverted claw 1
When the second printing unit is transported from 00 to the claw 90 and passes between the blanket cylinder 32 and the impression cylinder 30, the second color printing is performed on the same surface as before.

Further, when the specifications of the printed material are changed and the printing is switched from single-sided printing to double-sided printing, firstly, the cam followers 52 and 53 which have been pushed up by operating the push-up member (not shown) are moved to the suction rotating cam 49 and the suction moving cam. The cam surface 51 is brought into pressure contact with the cam surface and brought into an operating state.

Next, the motor 65 rotates in the direction opposite to that in the case of switching to single-sided printing by a command from the control device, and the drive shaft 70 is rotated.
Since the left and right large gears 57 and 60 rotate simultaneously counterclockwise in FIGS. 2 and 5 via the small gears 72 and 73, the sensors 76 and 77 detect the dog 75 fixed to the large gear 57, By sending a signal to the motor 65 and stopping it, the rotation of the large gears 57 and 60 is stopped. Large gear 57,
The operation frame 21 fixed to this by the rotation of 60
The claw opening / closing moving cam 58 on the side and the claw base vertical cam 61 on the driving frame 24 move simultaneously.

Next, the upstream cylinder group including the impression cylinder 29 is rotated with respect to the reversing cylinder 27 so that the peripheral surface moves by the length of the paper 110 in the vertical direction, and the periphery of the upstream impression cylinder 29 is rotated. The phase is adjusted so that the paper butt of the paper 110 wound on the surface faces the suction opening 47. After this, the above-described double-sided printing is performed.

In this embodiment, only the gripper device is shown as being operated by the moving cam. However, both the gripper device and the mouthpiece device may be operated, or only the mouthpiece device may be operated. You may.

The paper holding mechanism may be composed of only the gripper device or only the mouthpiece device, or may be a combination of the gripper device and the gripper device, or a combination of the mouthpiece device and the mouthpiece device.

Further, the movement of the moving cam is not limited to the rotation, but may be a reciprocating movement in a plane orthogonal to the axis of the reversing cylinder, or a reciprocating movement in the axial direction of the reversing cylinder.

Further, in this embodiment, an example is shown in which the moving cams are provided in each of the left and right frames. However, the present invention is not limited to this, and a plurality of moving cams may be provided in one frame.

[0070]

As is apparent from the above description, in the present invention, the tip end of the paper received from the upstream cylinder is held while being attached to the reversing cylinder disposed between the two cylinders, and the single-side printing is performed. A paper holding mechanism that holds the paper butt of the paper wrapped around the upstream cylinder and transfers the paper to the downstream cylinder while inverting the paper during duplex printing and a plurality of paper operating mechanisms that operate the paper holding mechanism. And a moving means for moving at least two of the plurality of cams together with the cams movably supported on a frame side. When switching between double-sided printing and single-sided printing, when the moving means is operated, a plurality of paper holding mechanisms for holding the paper received from the upstream cylinder and passing it to the downstream cylinder are operated. Moving cams at the same time Since dynamic, the operator is improved and workability is not necessary to move for operation, the machine operating rate switching time is shortened to improve.

In the invention according to claim 2, at least two of the plurality of cams are movable cams movably supported on the frame side, and these movable cams are used for holding the paper during duplex printing. By providing moving means for simultaneously moving between an operating position that regulates the operation of the mechanism and a retracted position that retracts from the operating position during single-sided printing, the moving means is used when switching between double-sided printing and single-sided printing. When activated, the plurality of moving cams move simultaneously between the operating position and the retracted position, so that the operator does not need to move for operation, improving workability, shortening switching time and reducing machine operation rate Is improved.

According to a third aspect of the present invention, in the first or second aspect, a detector for detecting the position of the moving cam, and the plurality of moving cams are moved at the same time under the control of the detector. By providing a moving device, when switching between double-sided printing and single-sided printing, the operator does not need to move for operation, improving workability, shortening the switching time and improving machine operation rate Along with
Since the detector detects the position of the moving cam and controls the movement of the moving cam, the moving amount of the moving cam can be accurately controlled, and the switching can be easily automated.

[Brief description of the drawings]

FIG. 1 is an exploded cross-sectional view of the vicinity of an operation side frame that supports a reversing cylinder shown in a single-sided printing state.

FIG. 2 is a front view of the reversing cylinder seen in the II-II direction of FIG.

FIG. 3 is an exploded cross-sectional view of the vicinity of a driving side frame that supports the reversing cylinder shown in a single-sided printing state.

FIG. 4 is a front view of the reversing cylinder as viewed in a direction IV-IV in FIG. 3;

FIG. 5 is a front view of the reversing cylinder viewed in the II-II direction of FIG. 1 and shown in a double-sided printing state.

FIG. 6 illustrates a claw, which is used to explain a paper holding operation;
It is a front view of a nail stand and a mouthpiece.

FIG. 7 is a cross-sectional view of the outer peripheral cutout portion of the reversing cylinder.

FIG. 8 is a side view showing the vicinity of a reversing cylinder for explaining the operation of the mouthpiece and the reversing claw.

FIG. 9 is a cylinder arrangement diagram of a conventional sheet-fed rotary printing press with a reversing mechanism.

[Explanation of symbols]

 21 Frame 24 Frame 27 Reversing Cylinder 29 First Impression Cylinder 30 Second Impression Cylinder 40 Claw Stand 45 Claw 47 Suction 49 Suction Rotating Cam 51 Suction Moving Cam 52 Cam Follower 53 Cam Follower 54 Claw Open / Close Fixed Cam 56 Cam Follower 57 Large Gear 58 Claw Opening / closing moving cam 60 Large gear 61 Claw base vertical cam 63 Cam follower 65 Motor 70 Drive shaft 72 Small gear 73 Small gear 74 Dog 75 Dog 76 Sensor 77 Sensor 80 Claw 90 Claw 100 Claw 110 Paper

Claims (3)

(57) [Scope of request for utility model registration] 1. A reversing cylinder arranged between a cylinder on the upstream side and a cylinder on the downstream side with respect to the paper transport direction with the two cylinders and the peripheral surface thereof being opposed to each other. Holding the leading end of the paper received from the upstream cylinder and transferring it to the downstream cylinder, receiving and holding the paper butt of the paper wrapped around the upstream cylinder during duplex printing, and inverting the paper In a sheet-fed rotary printing press equipped with a reversing mechanism including a paper holding mechanism to be delivered to the downstream cylinder and a plurality of cams for operating the paper holding mechanism, at least two of the plurality of cams are framed. A print switching device for a sheet-fed rotary printing press with a reversing mechanism, comprising a moving cam movably supported on the side, and a moving means for moving these moving cams together. 2. A reversing cylinder disposed between an upstream cylinder and a downstream cylinder with respect to the paper transport direction such that the two cylinders and the peripheral surface thereof are in contact with each other. Holding the leading end of the paper received from the upstream cylinder and transferring it to the downstream cylinder, receiving and holding the paper butt of the paper wrapped around the upstream cylinder during duplex printing, and inverting the paper In a sheet-fed rotary printing press with a reversing mechanism, comprising a paper holding mechanism to be delivered to the downstream cylinder and a plurality of cams for operating the paper holding mechanism, at least two of the plurality of cams Is a moving cam movably supported on the frame side,
Moving means for moving these moving cams at the same time between an operation position for restricting the operation of the paper holding mechanism during the double-sided printing and a retracted position retracted from the operation position during the single-sided printing is provided. Print switching device for a sheet-fed rotary printing press with a reversing mechanism. 3. A detector for detecting a position of the moving cam,
3. The print switching device for a sheet-fed rotary printing press with a reversing mechanism according to claim 1, further comprising a moving device controlled by the detector to move the plurality of moving cams at the same time.