JP3172464B2 - Plate holder for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for pressing a printing plate of a printing press against a plate cylinder.

[0002]

2. Description of the Related Art When a printing plate in the form of a thin plate or sheet is mounted on a plate cylinder of a printing press, conventionally, the printing plate is mounted on a clamp on the grip side of the plate cylinder, and then the plate cylinder is brought into contact with the blanket cylinder. Alternatively, the plate cylinder is rotated while the plate cylinder is brought into contact with the water roller to press the printing plate against the surface of the plate cylinder. However, in these methods, the ink adhered to the blanket cylinder and the water roller is transferred to the printing plate, and the balance of the ink adhesion to the plate at the start of printing is deteriorated, and the imaging of the plate is adversely affected, which is satisfactory. Sometimes printing was not possible.

[0003] Japanese Utility Model Laid-Open No. 5-58284 discloses a plate pressing roller urged toward a plate cylinder by a coil spring;
A plate mounted on the shaft end of the plate pressing roller and capable of restraining the plate pressing roller at a position separated from the plate cylinder against the force of a coil spring, and a plate provided with a lever for rotating the plate cam A presser device is disclosed. According to this device, when the printing plate is mounted, the lever is operated to release the restriction of the plate pressing roller by the plate cam, and the plate pressing roller is pressed against the plate cylinder by the force of the coil spring, and the roller is pressed between the roller and the plate cylinder. Can hold the printing plate. At the time of printing, the plate holding roller is separated from the plate cylinder to prevent ink from adhering to the plate holding roller, and the disadvantage of the plate holding method using the blanket cylinder and the water roller can be eliminated.

[0004]

In the plate holding device described in the above publication, a plate cam is attached to the shaft end of a plate holding roller to which the force of a coil spring acts, and the shaft end is directly driven. Therefore, when the lever is operated to separate the plate holding roller from the plate cylinder, the force of the coil spring acts greatly on the lever, and the position of the plate holding roller cannot be switched smoothly. Moreover, since the lever is provided on each of the pair of frames, the operation is troublesome. Since it is necessary to urge both ends of the printing press roller with a coil spring and to provide a plate cam near the both ends, the configuration of the end of the printing press roller is complicated and the printing press roller cannot be easily removed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plate holding device which can drive the plate holding roller with a light load by a lever or the like, and more preferably can easily attach and detach the plate holding roller.

[0006]

Hereinafter, the present invention will be described with reference to the drawings showing embodiments of the present invention. However, the present invention is not limited to the illustrated embodiment.

According to a first aspect of the present invention, there is provided a support member (5) rotatably mounted on each of a pair of frames (1, 2) supporting both ends of a plate cylinder (3), and a support member (5). Plate press roller (1) that is bridged between one end portions (5a) of the plate cylinder and that can be separated from and brought into contact with the plate cylinder (3) as the support member (5) rotates.
0), means (18) for urging the plate holding roller (10) toward the plate cylinder (3), and a fulcrum (20a) rotatably mounted on each of the pair of frames (1, 2). ) And an eccentric part (20b) eccentric from the fulcrum (20a) and engaged with the other end (5b) of the support member (5), and the eccentric part (20b) centered on the fulcrum (20a). A driving member (20) capable of driving the support member (5) so that the plate pressing roller (10) is separated from the plate cylinder (3) by the eccentric movement of
The above object is achieved by a printing press holding device comprising:

According to a second aspect of the present invention, in the plate presser of a printing press according to the first aspect, the distance from the rotation center of the support member (5) to the axis of the plate press roller (10) is equal to the distance of the support member (5). The distance from the center of rotation of the driving member (20) to the center of rotation of the driving member (20) is set to be larger.

According to a third aspect of the present invention, in the printing press of the first aspect, the driving members (20, 20) respectively mounted on the pair of frames (1, 2) are integrally rotatably connected. A coupling mechanism (30) is provided.

According to a fourth aspect of the present invention, in the plate press device for a printing press according to the first aspect, a plate pressing roller (10) is provided detachably with respect to the support member (5).

[0011]

FIG. 2 is a cross-sectional view of a printing press incorporating a plate presser according to an embodiment of the present invention. As shown in this figure, the printing press has a pair of frames 1,
2 are provided, and various rollers such as a plate cylinder 3 and a water foam roller 4 (see FIGS. 1 and 3) are rotatably mounted between the frames 1 and 2. The side on which the frame 1 is provided is the operating side of the printing press, the side on which the frame 2 is provided is the non-operating side of the printing press, FIGS. 1 and 4 show the configuration of the operating side, and FIGS. The configuration of the operation side is shown.

As shown in FIG. 1 to FIG.
Support arms (supporting members) 5, 5 are respectively mounted on the inner surface side of the.
The fulcrum pins 6, 6 are coaxial with each other. A groove 5a is formed at one end of the support arm 5, and both ends 10a and 10a of the plate pressing roller 10 are inserted into the groove 5a. A cover 10b made of an elastic material such as rubber is attached to the center outer periphery of the plate holding roller 10.

As shown in FIG. 2, a metal bush 11 and a washer 12 are rotatably fitted to the outer periphery of an end portion 10a of the plate holding roller 10, and are restrained by a retaining ring 13 without play in the axial direction. The metal bush 11 is inserted into the groove 5a, and a plate 14 that covers the groove 5a is attached to the support arm 5 from above by a bolt 15. As a result, the plate holding roller 10 is rotatably mounted between the support arms 5 and 5. In FIG. 2, reference numerals are given only to the non-operation side, but the operation side end 10 a is also attached to the support arm 5 with the same configuration. A bearing may be used instead of the metal bush 11.

As shown in FIGS. 1 and 3, the plate holding roller 10 is brought into contact with the plate cylinder 3 (position indicated by a solid line) P1 by swinging the support arm 5 about the fulcrum pin 6. ,
It moves between a position (position indicated by an imaginary line) P2 away from the plate cylinder 3. By operating the bolt 15, the plate 14
The plate holding roller 10 can be removed from the printing press only by removing the plate holding member, so that the plate holding roller 10 can be easily cleaned.

The frames 1, 2 have spring holders 16, 1,
6 are fixed by bolts 17 and 17, respectively. A coil spring (biasing means) 18 is mounted between each holder 16 and the support arm 5 in a compressed state. Due to the repulsive force of the coil spring 18, the plate holding roller 10 is urged toward the contact position P1 via the support arm 5.

As shown in FIGS. 1 to 3, the frames 1, 2
Are mounted with eccentric pins (drive members) 20, 20. The eccentric pin 20 has a fulcrum part 20a rotatably mounted on the frames 1 and 2, respectively, and an eccentric part 20b eccentric from the fulcrum part 20a. The outer periphery of the eccentric portion 20b can be engaged with an operation portion 5b provided at the other end of the support arm 5. As shown in FIGS. 1 and 2, a boss 21 is attached to the eccentric portion 20 b of the eccentric pin 20 on the operation side so as to be integrally rotatable, and an operation lever 22 for rotating the eccentric pin 20 is attached to the boss 21. Can be

On the outer periphery of the boss 21, the operation lever 22 is moved to the ON position (solid line position in FIG. 1) and the OFF position (the imaginary line position in FIG. 1) corresponding to the contact position P1 and the separation position P2 of the plate pressing roller 10, respectively. The notches 21a, 21a for positioning are respectively formed in (1). A spring plate 23 having a convex portion 23a that selectively engages with the notches 21a is fixed to the frame 1 with bolts 24.

As shown in FIGS. 2, 4 and 5, the left and right eccentric pins 20, 20 are connected by a connecting mechanism 30 so as to be integrally rotatable. The connection mechanism 30 includes a connection shaft 31 rotatably mounted between the frames 1 and 2, arms 32 and 32 fixed to both ends of the connection shaft 31 so as to be integrally rotatable, and the arms 32 and 32 and pins Links 34, 34 rotatably connected via 33, 33 are fixed to the fulcrum 20a of the eccentric pin 20, and the link 34, the pin 35
And arms 36, 36 which are rotatably connected via the. In FIGS. 4 and 5, the operation lever 22 is O
The link 34 and the like at the N position are shown by solid lines, and the link 34 and the like at the OFF position are shown by imaginary lines.

In the above configuration, when the operation lever 22 is at the ON position in FIG. 1, the eccentric portion 20b of the eccentric pin 20
A gap is created between the plate holding roller 10 and the operating portion 5b of the support arm 5, and the plate pressing roller 10 is urged to the contact position P1 by the force of the coil spring 18 and pressed against the surface of the plate cylinder 3. By rotating the plate cylinder 3 while inserting the plate 7 between the plate cylinder 3 and the plate pressing roller 10 in this state, the plate 7 can be wound around the plate cylinder 3.

When the operation lever 22 is switched to the OFF position in FIG. 1 after the printing plate 7 is mounted, the eccentric portion 20b of the eccentric pin 20 engages with the operation portion 5b, and the support arm 5 moves around the fulcrum pin 6. 1 is driven to rotate counterclockwise. As a result, the plate pressing roller 10 moves to the separation position P2 from the plate cylinder 3. Printing can be performed in this state. Since the left and right eccentric pins 20, 20 are connected by the connecting mechanism 30, each eccentric pin 20 is driven synchronously only by operating the operation lever 22 on the operation side, and the plate pressing roller 10 is moved between the operation side and the opposite side. The operation side moves with respect to the plate cylinder 3 at the same time.

As described above, in the apparatus of this embodiment, the plate holding roller 10 is provided at one end of the support arm 5 and is urged by the coil spring 18 while the other end of the support arm 5 is The eccentric portion 20b is engaged with the eccentric portion 20b, and the eccentric pin 20 is rotated by rotating the operation lever 22.
, The plate holding roller 10 can be driven with a light load. Especially fulcrum pin 6
Is set to be larger than the distance from the fulcrum pin 6 to the eccentric pin 20, the amount of eccentricity of the eccentric pin 20 required to drive the required amount of the plate holding roller 10 is small. Since the rotation angle of the operation lever 22 can be set large enough for the small eccentric amount, the force required for operating the plate holding roller 10 can be further reduced.

As shown in FIG. 2, a spacer 37 is provided between the frame 2 on the non-operation side and the arms 32 and 36.
37 is interposed. By adjusting the thickness of the spacer 37,
Each component of the control mechanism 30 is assembled to the frames 1 and 2 without rattling in the axial direction of the plate pressing roller 10. As shown in FIGS. 2 and 4, a stopper 38 that regulates the rotation range of the arm 36 when the plate pressing roller 10 moves to the contact position P1 is provided on the operation side frame 1 with the bolt 3.
Fixed at 9. The stopper 38 limits the pressing force of the plate pressing roller 10 against the plate cylinder 3 to an appropriate range, thereby preventing an excessive pressure.

Next, another embodiment of the present invention will be described with reference to FIGS. In each figure, the same reference numerals are given to the same parts as those in FIGS. 1 to 5, and the description thereof will be omitted.

FIGS. 6 and 7 show an eccentric pin 20 and a solenoid actuator 50 attached to the frame 1 by bolts 51, 51 instead of the operation lever 22 of FIG.
20 is an example of driving the motor 20. Solenoid actuator 5
Numeral 0 has a movable portion 50a which moves forward and backward in response to switching between excitation and demagnetization of a built-in solenoid coil (not shown). The frame 1 is provided with a spring receiving pin 52, and the pin 35 of the control mechanism 30 is provided with a spring hook 35a. A coil spring 5 is provided between the spring hooking portion 35a, the movable portion 50a and the spring receiving pin 52, respectively.
3, 54 are mounted.

When the solenoid actuator 50 is energized to excite the solenoid coil, the movable portion 50a moves in the ON direction in FIG. Moves to the solid line position in FIG. This position is the same as the solid line position in FIG. 4 (the ON position of the operation lever 22 in FIG. 1). When the energization of the solenoid actuator 50 is stopped, the link 34 and the like are pulled by the force of the coil spring 54,
The arm 36 comes into contact with the stopper pin 55 and is restrained at the imaginary line position in FIG. This position is the position of the imaginary line in FIG.
(OFF position of the operation lever 22). In addition,
Instead of the solenoid actuator 50, various actuators such as an air cylinder may be used.

FIGS. 8 to 10 show an example in which the control mechanism 30 in FIG. 2 is omitted, and the boss 21 and the operation lever 22 are also attached to the eccentric pin 20 on the non-operation side. In this example, it is necessary to operate the two operation levers 22, 22, but since the operation force of the operation lever 22 is small, the operability is better than that of a conventional device provided with two operation levers. . In this embodiment, the arms 36, 36 of the control mechanism 30 are mounted on the eccentric pin 20 and the stopper 38 engaging with the arm 36 is provided with a frame 38 in order to limit the pressing force of the plate holding roller 10 against the plate cylinder 3. 1 and 2.

[0027]

As described above, according to the first aspect of the present invention, a plate pressing roller is mounted on one end of a support member rotatably provided on a pair of frames to urge the plate cylinder side. Then, the other end of the support member is engaged with the eccentric portion of the drive member, and the drive member is driven by the eccentric movement to separate and separate the plate pressing roller from the plate cylinder. The plate holding roller can be operated with a lighter load than in the case where the plate cam is provided and the plate holding roller is directly driven, so that the efficiency of the plate mounting work can be improved. In particular, according to the second aspect of the present invention, the printing press roller can be driven by a required amount while the eccentric amount of the eccentric portion with respect to the rotation angle of the driving member is set small, so that the printing press roller can be operated with a lighter load. In particular, a light operation feeling can be provided when the drive member is manually operated by the operation lever.

According to the third aspect of the present invention, only by driving the driving member on one of the frames with the operation lever or the actuator, the driving members of the respective frames can be rotated synchronously. Can be simultaneously moved toward and away from the plate cylinder to prevent malfunctions caused by twisting of the plate pressing roller. According to the invention of claim 4,
The plate holding roller can be easily removed from the support member to perform maintenance and inspection such as cleaning and replace the roller.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which a mechanism provided in an operation side frame of a printing press according to a first embodiment of the present invention is viewed from an inner surface side of the frame.

FIG. 2 is a cross-sectional view of the printing press of FIG.

FIG. 3 is a diagram illustrating a mechanism provided on a non-operation side frame of the printing press in FIG. 1 as viewed from an inner surface side of the frame.

FIG. 4 is a diagram showing a mechanism provided on an operation side frame of the printing press shown in FIG. 1 as viewed from an outer surface side of the frame.

FIG. 5 is a diagram illustrating a mechanism provided on a non-operation side frame of the printing press in FIG. 1 as viewed from an outer surface side of the frame.

FIG. 6 is a view showing a printing press according to a second embodiment of the present invention in correspondence with FIG.

FIG. 7 is a view showing a printing press according to a second embodiment of the present invention in correspondence with FIG.

FIG. 8 is a view showing a printing press according to a third embodiment of the present invention in correspondence with FIG.

FIG. 9 is a view showing a printing press according to a third embodiment of the present invention in correspondence with FIG.

FIG. 10 shows a printing press according to a third embodiment of the present invention in FIG.
FIG.

[Explanation of symbols]

 1, 2 frame 3 plate cylinder 5 support arm (support member) 7 printing plate 10 plate holding roller 11 metal bush 18 coil spring 20 eccentric pin (drive member) 20a fulcrum 20b eccentric part 22 operating lever 30 coupling mechanism 50 solenoid actuator

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-207248 (JP, A) JP-A-8-332716 (JP, A) JP-A-5-220933 (JP, A) 84888 (JP, A) Japanese Unexamined Patent Publication No. Hei 8-300625 (JP, A) Japanese Unexamined Patent Publication No. Hei 7-314643 (JP, A) Japanese Utility Model Unexamined Publication No. 5-58284 (JP, U) Special Table Hei 8-501260 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41F 27/00-27/12

Claims (4)

(57) [Claims] A support member rotatably mounted on each of a pair of frames supporting both ends of the plate cylinder; and a support member which is bridged between one end of the support member and which rotates with the rotation of the support member. A plate press roller that can be separated from and brought into contact with the plate cylinder, a unit that urges the plate press roller toward the plate cylinder, a fulcrum that is rotatably mounted on each of the pair of frames, and An eccentric portion that is eccentric from the fulcrum and engages with the other end of the support member, and the eccentric movement of the eccentric portion around the fulcrum causes the plate pressing roller to separate from the plate cylinder. And a driving member capable of driving the support member. 2. The method according to claim 1, wherein a distance from a rotation center of the support member to an axis of the plate pressing roller is set to be larger than a distance from a rotation center of the support member to a rotation center of the drive member. The plate presser of a printing press according to claim 1. 3. The plate presser of a printing press according to claim 1, further comprising a connecting mechanism for connecting the driving members mounted on the pair of frames so as to be integrally rotatable. 4. The plate press device for a printing press according to claim 1, wherein said plate press roller is detachably mounted on said support member.