JPH10109406A - Printing plate holding apparatus of printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an exclusive part such as a changeover lever and to attach and detach a two-page width plate by one worker by bringing the press plate provided to a tension bar into contact with the slit groove surface of a plate cylinder through the spring force of a spring mechanism under pressure to transmit the centrifugal force of the press plate to the pressing part of a printing plate. SOLUTION: When a printing plate 5 is mounted on the outer peripheral surface 1a of a plate cylinder 1, the gripping side W2 of the printing plate 5 subjected to L-shaped bending processing is inserted in the gap between the gripping part of the plate cylinder 1 and a press plate 3 (plate pressing part) and, thereafter, the plate cylinder 1 is once rotated in a forward direction (arrow direction) while the printing plate 5 is pressed by the hand. Succeedingly, the end W1 opposite to the gripping end of a paper sheet is inserted in the plate pressing part to complete the mounting of the printing plate 5. This production plate holding apparatus requires no tool or changeover lever and the printing plate 5 can be attached to and detached from the plate cylinder 1 by one operation and the position of the printing plate in its lateral direction can be easily altered. Therefore, even in the case of a two-page width plate, it can be attached and detached by one worker.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate holding device mounted on a plate cylinder of a rotary printing press.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show an example of a conventional plate holding device mounted on a plate cylinder of a rotary printing press. FIG. 6 is an enlarged front view of a main part thereof, and FIG. 8 is a view taken along the line ZZ, and FIG.

In FIG. 6 to FIG. 8, reference numeral 1 denotes a plate cylinder. A plurality of bolts 18 and press fittings are provided in a groove 1f of a plate holding portion formed over the entire length of the plate cylinder 1 in the axial direction. There is provided a leaf spring 20 which is fixed via a pin 19 and a tension bar 21 which is engaged with and pressed by the leaf spring 20.
The tension bar 21 engaged with the leaf spring 20
Has a shape in which a part of the shaft outer periphery is machined into a flat surface 21a, and the distance between the shaft center 21e and the leaf spring 20 can be changed by rotation. The tension bar 21 is divided into two sets in the axial direction of the plate cylinder 1. By rotating a dedicated tool (handle) 17 attached to both outer shaft ends 21b, the tension bar on each side is rotated. Each of the bars 21 is rotatable independently.

As shown in FIG. 8, the front gripping side of the printing plate 5 can be engaged with a gripping portion protruded from the plate cylinder 1, and the rear gripping butt side is at the tip of the leaf spring 20. Each is formed into an L-shape so that it can be engaged.
S is the entrance width of the plate 5 locking groove 1a of the plate cylinder 1.

In the above-described conventional plate holding device, the plate 5
First, the tension bar 21 is rotated in a predetermined direction by using the special tool 17, whereby the leaf spring 20 is moved to the left side in the figure as shown in FIG. The insertion part of the plate 5 is opened. In this state, the grip side of the front end of the plate 5 is then hooked on the grip portion of the plate cylinder 1, and the plate cylinder 1 is rotated in the forward direction (arrow e in the figure) while lightly pressing the surface of the plate 5 with the hand. 1 turn. After that, the plate holding side is pushed down by hand to a position where the leaf spring 20 is hooked on the leaf spring 20, and at the same time, the tension bar 21 is reversely rotated with the other hand using the special tool 17 to push out the leaf spring 20. As a result, as shown in FIG. 8 (B), a predetermined tension is applied to the holding edge of the printing plate 5 by the bending due to the movement of the leaf spring 20 to the right side in the figure, and the plate spring 20 is fixed. The operation of removing the printing plate 5 may be the reverse of the above operation.

[0006]

In the above-described plate holding device of the conventional rotary printing press, the holding edge side of the printing plate 5 is pushed down until it is hooked on the plate spring 20 provided on the plate cylinder 1; The tension bar 21 is rotated by operating the special tool (handle) 17 with the other hand, and the tension bar 21 is rotated.
The plate spring 20 engaged with the plate 5 is pushed out by changing the rotation phase of the plate 5, and tension is applied to the plate 5 by using the reaction force of the plate spring 20, and this is applied to the plate cylinder 1. It is configured to be wound. Therefore, there are the following problems.

(1) Since one work is used for the operation of the tension bar 21, only the other hand presses the holding edge of the printing plate 5; The entire area in the direction cannot be held down by one worker, and the plate 5 cannot be mounted by one worker.

(2) Opening, that is, the plate cylinder 1 due to the limitation of the processing of the gap portion for inserting the front and rear ends of the plate 5 and the assembling method.
The width of the groove 1a in the axial direction formed on the outer peripheral portion is increased, and the length of the non-printed portion is increased.

(3) Since the shape of the leaf spring 20 for applying tension to the edge of the plate 5 is complicated and it is difficult to increase the bending accuracy of the plate spring 20, the plate 5 to be mounted is
In this case, problems such as plate floating and plate breakage occur.

(4) It takes time to attach and detach the printing plate 5, and the operation rate of the machine is reduced.

(5) It is difficult to correct the mounting position of the printing plate 5 in the width direction of the printing plate 5 (axial direction of the plate cylinder 1).

SUMMARY OF THE INVENTION It is an object of the present invention to allow a single operator to mount a printing plate on a plate cylinder in one process without requiring special tools or special parts. It is an object of the present invention to provide a plate holding device for a printing press, in which labor saving of work, reduction of dedicated parts and tools, and improvement of printing efficiency by shortening a non-printing long portion are realized.

[0013]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and the first means, which is the gist thereof, is:
A tension bar fitted to the plate cylinder so as to be movable in the axial direction thereof, and a groove that opens to the slit groove for fixing the printing plate end provided in the plate cylinder is provided in the tension bar, In the groove, a centrifugal force is generated by the rotation of the plate cylinder, and a presser for pressing the printing plate end against the slit groove surface by the centrifugal force and the spring force of a spring mechanism provided on the tension bar. A plate holding device for a printing press characterized by comprising a plate.

In the first means, the press plate is divided into a plurality in the axial direction of the plate cylinder, and each press plate is capable of independently pressing the plate end to the slit groove. Preferably, it is constituted.

According to the above-mentioned means, after the gripping side of the printing plate is inserted between the front end of the holding plate and the slit groove surface located at the gripping portion of the plate cylinder, the plate cylinder is rotated once in the normal rotation direction. The printing plate is wound, and then the rear end of the printing plate is inserted between the holding plate and the slit groove surface, thereby completing the mounting of the printing plate on the plate cylinder. At this time, the spring force of the spring mechanism is applied to the holding plate to press the wound portion of the printing plate between the holding plate and the slit groove via the holding plate.

Further, when the plate cylinder rotates during operation of the printing press, a centrifugal force is generated on the press plate, and the winding portion of the printing plate is applied to the plate cylinder via the press plate by the centrifugal force and the spring force. It is firmly pressed. As a result, the printing plate can be mounted on the plate cylinder in one process by one worker, and the printing plate is firmly formed by the cooperation of the spring force of the spring mechanism and the centrifugal force of the holding plate. It is fixed to the plate cylinder.

According to a second aspect of the present invention, a register pin is provided in the groove of the tension bar, the register pin being capable of being engaged with an engagement portion provided at an appropriate position in the axial direction of the printing plate. The plate holding device for a printing press is provided with a moving device for moving the plate in the axial direction of the plate cylinder to adjust the engagement position between the register pin and the engaging portion of the plate.

According to the above means, the tension bar is moved in the axial direction by the moving device to adjust the engagement position between the register pin mounted in the groove of the tension bar and the engagement portion provided at a proper position on the printing plate. This makes it possible to easily correct the position of the printing plate in the width direction.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an enlarged front view of a main part of a plate holding device of a rotary printing press according to a first embodiment of the present invention, FIG. 2 is an operation explanatory view, and FIG. FIG. 4 is an enlarged front view, FIG. 4 is an explanatory view of the operation of the adjustment unit, and FIG.

1 and 2, reference numeral 1 denotes a plate cylinder; 5, a printing plate wound around the outer peripheral surface 1a of the plate cylinder 1; and 2, a tension bar rotatably supported by the plate cylinder 1. . The fixing portion of the printing plate 5 is close to the outer peripheral surface 1 a of the plate cylinder 1, the tension bar 2 fitted in the axial direction of the plate cylinder 1,
The tension bar 2 includes a pressing plate 3 attached to a groove 2a formed in the axial direction of the tension bar 2, a spring mechanism 4 for swingably supporting the pressing plate 3, and the like.

The tension bar 2 is provided on the plate 5 of the plate cylinder 1.
It is fixed at a predetermined phase with respect to the insertion slit groove 1b, and is movable in the axial direction. The holding plate 3 is configured so that its front end can swing with its base portion (portion A in FIG. 1) as a fulcrum, and its front end portion (upper portion) has a slope for stably guiding the insertion of the printing plate 5. 3a are formed. The pressing plate 3 may be divided into a single piece or a plurality of pieces in the axial direction of the plate cylinder 1.

The spring mechanism 4 includes a spring case 4 b screwed to the tension bar 2,
b, a plunger 6 reciprocally fitted therein, a spring 4a for pressing the spherical end portion of the plunger 6 against a portion near the base of the holding plate 3 with a predetermined pressing force, and a screw 4 engaged with the case 4b. It is constituted by a spring receiver 4c and the like. By adjusting the screwing amount of the spring receiver 4c, the pressing force of the plunger 6 can be adjusted via the spring 4a.

Further, the spring mechanism 4 includes a plus side W ₂ of the plate cylinder 1 side, the upper part of the pressing plate 3 is swung, it was inserted adding side W ₂ and added trailing W ₁ of the plate 5 When
The pressing force is set to a value not less than a value at which the printing plate 5 does not come off due to its own weight or elasticity.

When the plate 5 is mounted on the outer peripheral surface 1a of the plate cylinder 1 in the plate holding device configured as described above,
Figure 1, as shown in FIG. 2, first, inserting the added side W ₂ of the plate 5 which has been subjected to bending to the L-shaped in other words the plate pressing portion between the gripping portion and the pressing plate 3 of the plate cylinder 1 I do. Next, printing plate 5
The the plate cylinder 1 while holding the hand is rotated 1 in the forward direction (arrow direction in FIG. 1), followed by the addition trailing W ₁ of the plate 5 similarly to the plate was added the side W _2, the plate pressing (Wing side W
₂ between the end of the printing plate 5 and the holding plate 3). Thus, the mounting of the printing plate 5 is completed.

[0025] When removing the plate 5 is lightly tapping by hand trailing W ₁ was added, by adding a force to the extraction side, after leaving the plate 5 from the plate holding unit, when the mounting What is necessary is just to perform the reverse operation.

According to the printing plate holding device constructed as described above, the plate cylinder 1 rotates as shown by the arrows in FIGS. Plate 5 is plate cylinder 1
Of the ink application rollers 7 which are in rolling contact with the outer peripheral surface 1a of the roller ₁ are successively squeezed to the holding side W1 and brought into close contact with the plate cylinder 1. The inking roller 7 functions to brake the centrifugal force caused by the high-speed rotation in the direction in which the plate 5 is peeled off. In addition, the centrifugal force acts on the presser plate 3 side around the fulcrum in the presser plate 3 to press the portion holding the printing plate 5 to increase the holding force.

That is, as shown in FIG. 2, the pressing force F is expressed by the following equation.

F = (f ₁ l ₁ + f ₂ l ₂ ) / x (1) where f ₁ = operating force of the spring 4a f ₂ = acting force x, l ₁ , of the above-mentioned centrifugal force in the tightening direction. l ₂ = distance of the holding plate 3 from the base A Therefore, the printing plate 5 is securely fixed to the plate holding portion by the pressing force F shown in the above equation (1).

FIGS. 3 to 5 show a mechanism for adjusting the position of the plate holding apparatus according to the second embodiment of the present invention in the plate width direction. 3 to 5, the position adjusting mechanism is formed in the vicinity of the outer peripheral surface 1a of the plate cylinder 1 in the form of a tension bar 2 fitted in the plate cylinder axial direction and in the axial direction of the tension bar 2. It comprises a register pin 8 attached to the groove 2a by a bolt 81, a moving device 9 for moving the tension bar 2 in the axial direction with respect to the plate cylinder 1, and the like. Also, the notch 16 which engages the register pin 8 on both the trailing W ₁ added with added side W ₂ of the plate 5 is provided.

The register pin 8 fixed to a part of the tension bar 2 is used when the tension bar 2 is fitted.
The surface of this protrusion portion 8a is configured to contact the pressing surface of the printing plate 5 of the added side W ₂ of the plate cylinder 1. Next, the moving device 9 moves the tension bar 2 with respect to the plate cylinder 1 in the axial direction.
And an adjustment screw 11 having a tip fixed to the tension bar 2 via the adjustment screw 11 is attached to the bracket 1.
0, and the adjusting screw 11 is moved by the rotation of the moving nut 12 incorporated in the bracket 10, whereby the tension bar 2 for the plate cylinder 1 is moved.
Position can be set. A scale 13 is engraved in the circumferential direction of the outer periphery of the moving nut 12, and a scribe line 14 on the bracket 10 is made to correspond to the scale 13 so that the tension bar 2 is formed.
Can be detected. Fifteen
Is a lock nut for fixing the adjustment screw 11 to the bracket 10 and restricting the displacement of the tension bar 2.
Further, the moving device 9 is provided on each of the tension bars 2 provided separately in the axial direction of the plate cylinder 1 so that each of the tension bars 2 can be moved and adjusted independently.

The tension bar 2 configured as described above
As shown in FIG. 4, the printing plate 5 in which the notches 16 are formed in the front and rear, that is, both on the grip side and the grip bottom side, is mounted with the notches 16 and the register pins 8 aligned. As a result, the position of the plate cylinder 1 in the axial direction is reliably set. Further, the printing displacement in the width direction on the printing paper can be corrected by moving the tension bar 2 in the axial direction to change the position of the register pin 8. That is, the printing deviation is measured by measuring the printing position on the printing paper and then transmitting the measured value to the moving device 9.
If the number of scales of the moving nut 12 is replaced, the correction can be easily made, thereby shortening the working time.

As described above, the plate holding device according to the embodiment of the present invention does not require a tool, a switching lever 17 or the like, unlike the conventional plate holding device. And the position of the printing plate 5 in the width direction can be easily changed. Therefore, even if it is a two-page full width version,
A human operator can perform the attachment / detachment operation. Further, it is possible to shorten the non printing length for possible width reduced formation of structural added side W ₂ of the plate 5, addition of the plate cylinder 1 to inserting the end portion of the trailing W ₁ slit groove 1b, effective printing The length can be increased.

In connection with this, it is possible to change the cut-off (reduce the circumferential length of the plate cylinder), thereby reducing the margin of the newspaper, reducing the paper cost, and reducing the inking roller 7 to the gap, that is, the slit groove. Vibration and noise generated when passing through the portion 1b can be reduced. Furthermore, a special device for separately attaching and detaching the inner and outer pages in the width direction is not required, and only the plate cylinder 1 is a component that causes plate floating and plate breakage, and the number of components requiring precision is reduced. Therefore, the manufacturing cost can be significantly reduced. Note that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention.

[0034]

The present invention is configured as described above.
According to the present invention, the presser plate provided on the tension bar is pressed against the slit groove surface of the plate cylinder via the spring force of the spring mechanism, and the centrifugal force of the presser plate accompanying the high-speed rotation of the plate cylinder is further applied to the printing plate. Since the pressing portion of the printing plate is firmly pressed and held on the plate cylinder by acting on the pressing portion, and the moving device and the register pin are provided so that the horizontal position of the printing plate can be easily corrected. The following effects are obtained.

(1) After the plate is inserted into the plate holder at one end, the plate is wound by rotating the plate cylinder, and the plate can be mounted only by inserting the other end into the plate holder. At the same time, the printing plate can be easily removed. This eliminates the necessity of special components such as tools and switching levers, and makes it possible for one operator to easily attach and detach the printing plate even in the case of a two-page width plate, thereby achieving labor saving.

(2) The structure is simple, there are no parts requiring high precision, and there is no unreasonable mechanism that causes problems such as plate floating and plate breakage. In addition, a special structure for attaching and detaching the printing plate separately for the inner and outer pages in the width direction is not required.

(3) The gap (the entrance width of the slit groove) of the plate insertion portion formed on the outer peripheral surface of the plate cylinder can be reduced, and the non-printing length can be reduced, so that the actual printing length can be lengthened. Becomes Further, the running cost can be reduced by changing the cutoff.

(4) Since the gap can be reduced as described above, it is possible to reduce the vibration and noise when the rolling contact roller passes through the gap.

(5) The workability in attaching and detaching the printing plate is good, the time can be shortened, and the machine operation rate can be improved.
(Productivity can be improved.) (6) A shift in the width direction of each page on printing paper can be easily corrected.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a main part of a plate holding device of a rotary printing press according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory view in the first embodiment.

FIG. 3 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 4 is a side view showing the second embodiment.

FIG. 5 is a view as seen from the arrow P in FIG. 4;

FIG. 6 is a drawing corresponding to FIG. 1 showing a plate holding device of a conventional rotary printing press.

FIG. 7 is a view taken in the direction of arrows ZZ in FIG. 6;

FIG. 8 is an operation explanatory view of the conventional example.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 2 tension bar 3 holding plate 4 spring mechanism 5 printing plate 6 plunger 7 inking roller 8 register pin 9 moving device 11 adjusting screw 12 moving nut 15 lock nut 16 notch

Claims (3)

[Claims] 1. A groove having a tension bar fitted to a plate cylinder so as to be movable in an axial direction thereof and opening to a slit groove for fixing a plate end provided on the plate cylinder. A centrifugal force is generated by rotation of the plate cylinder in the groove, and the centrifugal force and a spring force of a spring mechanism provided in the tension bar cause the plate end to be in the slit groove. A plate holding device for a printing press, comprising a presser plate for pressing against a surface. 2. The press plate is divided into a plurality in the axial direction of the plate cylinder, and each press plate is configured so that the press plate end can be independently pressed against the slit groove. A plate holding device for a printing press according to claim 1. 3. A plate cylinder having a tension bar fitted movably in the axial direction of the plate cylinder, wherein a groove that opens to face a plate groove fixing slit groove provided on the plate cylinder is provided. A tension pin is provided on the tension bar, and a register pin, which can be engaged with an engagement portion provided at an appropriate position in the axial direction of the printing plate, is mounted in a groove of the tension bar, and the tension bar is moved in the axial direction of the plate cylinder. A printing plate holding device for a printing press, comprising a moving device for adjusting the engagement position between the register pin and the engagement portion of the printing plate by moving the register pin.