JPH0361044A - Press plate mounting device in printing press - Google Patents

Abstract

PURPOSE:To easily and accurately nest a positioning reference pin into a reference hole provided on a press plate by a method wherein a press plate presser plate is provided on a top surface of a clamp plate of a bite-side plate vice so as to cover the press plate positioning projection piece to be inserted to the reference hole of the press plate. CONSTITUTION:A plate of a normal thickness serving as a base, such as a mount plate 25 or a PS plate as a substitute therefor, is loaded on a plate cylinder 1 by a bite-side plate vice 3 and a tail-side plate vice 4. After the mount plate 25 is loaded on the plate cylinder 1, a thin press plate 20, such as a paper plate, is inserted between an upper surface of a clamp plate 12 and a lower surface of a tip end of a presser plate 22 in a direction (a) from the end part thereof having a reference hole 20a. The reference hole 20a of the thin press plate 20 is fitted to a reference pin 21. Since a head part 21' of the reference pin 21 is shaped into a wedge form to become smaller in thickness toward the insertion side of the press plate 20, the press plate 20 can be smoothly inserted while the relative position of the reference hole 20a of the thin press plate 20 to the reference pin 21 is visually identified through a hole 23 provided on the presser plate 22.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a plate mounting device for mounting a printing plate on a plate cylinder of a printing press, particularly an offset printing press.

[Prior Art] The printing plate attached to the plate cylinder of an offset printing machine is generally a 28 plate made of aluminum.
(Zed Plate) Paper plates, resin plates, etc. are known.

Among these, 28 plates and resin plates are thicker and can be used to print a large number of sheets, but they are more expensive than paper plates and require a vise to attach and detach the plate from the plate cylinder. It had to be clamped to the torso, and it was a pain to put it on and take it off.

For this reason, in recent years paper plates and thin 28 plates have been used when the number of copies printed is small, but these thin plates are weaker than conventional 28 plates and resin plates, so the plate cylinder is cannot be attached directly to the Furthermore, even if it were to be directly attached to the plate cylinder, there was a risk that wrinkles would occur due to the position WA adjustment after being attached to the plate cylinder.

Therefore, when using a thin printing plate such as a conventional paper plate, the first
As shown in Figures 1 and 12, a plate mounting plate 53 for attaching a thin printing plate 52 such as a paper plate is provided on two sides of the side blade 51 of the plate cylinder 50, and is attached to the plate cylinder 50 in advance. A normal thick plate such as the 28th edition is used as a gofuku 54 (you may use a plate that is no longer needed after use), and this is used as a support, and a thinner printing than the gofuku is applied to the surrounding surface. The plate 52 was attached by being hooked onto the plate 53.

When adjusting the position of the thin printing plate 52 with respect to the plate cylinder 50, the base plate 54 having the same thickness as the normal plate is moved, and the thin printing plate 52 is aligned with the base plate 54. It was supposed to be moved in one piece.

[Problems to be Solved by the Invention] The conventional plate mounting plate 53 is a thin printing plate 52 such as a paper plate.
When attaching the plate to the plate cylinder 50, the holes 52' of the printing plate 52 are designed to be hooked to a number of hooks 53' provided on the plate 53, so if the width of the plate is wide, it is difficult to hook the plate. At the same time, if the plate becomes wavy during the hooking operation, it often comes off from the hook 53', which requires a lot of time to attach the plate.

Moreover, since the hook 53 is fixed by gripping the side blade 5, when using a regular 28 plate instead of a paper plate or thin 28 plate, it is necessary to use the hook 53 between the vice stand 5 and the clamp plate 13. It is necessary to adjust the gap with the spherical bolt 15, which is very complicated.

Therefore, in small-lot printing using conventional thin printing plates,
The time required to change printing plates is longer than the actual printing time, etc.
This results in a significant decrease in work efficiency.

The present invention has been made in view of the above points,
The purpose is to provide a printing plate mounting device for a printing press that can quickly, easily, and accurately mount a thin printing plate such as a paper plate onto a plate cylinder. .

[Means for Solving the Problems] In order to achieve the above object, the printing plate mounting device of the printing press according to the present invention stores a plate vise device in a notch formed along the longitudinal direction of the plate cylinder, In the printing plate positioning device of a printing press, which is provided with a clamp plate for clamping the printing plate at the upper end of the plate vise device, a plate positioning device that fits into the reference hole of the printing plate is placed on the upper surface of the clamp plate of the grip side plate vise device. A press plate is provided, and the plate holding plate is formed to cover the protrusion, and the protrusion is formed so as to be lower toward the gripping side of the printing plate.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 10.

In the figure, reference numeral 1 denotes a plate cylinder, and the plate cylinder 1 is provided with a notch 2 extending over the entire length of the cylinder to accommodate plate vise devices 3 and 4 on the grip side and bottom side of the plate. Inside the notch 2, vise stands 5, 5 each having a slightly shorter overall length and a substantially rectangular cross section are housed. At the lower end of the vice stand 5.5, a dovetail is formed which fits into an engaging piece 6 fixed to the bottom of the notch 2 with a bolt 7, as shown in FIG. Therefore, the vise stands 5, 5 are prevented from floating up from the bottom surface of the notch 2 via the engagement piece 6. Numerals 8 and 9 are bolts for positioning the vise stands 5 and 5 with respect to the plate cylinder 1, and a plurality of bolts are provided in the longitudinal direction of the vise stands 5 and 5. Compression springs 10 are inserted into opposing holes 11 of the vise stands 5, 5, and urge the vise stands 5, 5 toward the wall surface of the notch 2. 1.2.
Reference numeral 13 denotes a clamp plate formed to have a length that divides the vise stands 5, 5 into approximately four equal parts in the longitudinal direction of the plate cylinder, and each clamp plate 1-12, 13 has a bolt hole 14 having a spherical concave seat. Two holes are drilled in each hole.

Screw holes are formed in the clamp stands 5, 5 to correspond to the bolt holes 14, and the clamp plates 1 to 12.
13 is held in a vice stand 5.5 by a spherical bolt 15. Further, a groove 16 having a substantially semicircular cross section is formed over the entire length of the vice stand 55 on the side opposite to the clamp, and a clamp shaft 17 is pivotally supported in the groove 16.

The clamp shaft 17 is formed with a notch 18 having an angular cross-section, and by rotating the clamp shaft 17, the end edges of the clamp plates 12, 1.3 engage with the notch 18. It looks like this. Therefore, the clamp plate 1213 is pivotally supported by the spherical bolt 15 and the spherical concave seat so that it can swing.

On the other hand, an eccentric shaft 19 is provided over the entire length of the plate cylinder 1 between the clamp-side end surface of the bottom vise 5 and the side surface of the notch 2. The plate vise device 4 on the tail side can be slid toward the plate vise device 3 on the bite side.

Therefore, the plate vise W3 has a normal thickness of 28
After gripping one end of the plate or resin plate, it is wound around the plate cylinder 1 and the other end is fixed by the plate cutting device 4 on the rear side.

The above configuration is similar to a conventional plate cylinder device.

In the present invention, a paper plate or a paper plate with a thickness of 0, ], 5 muu
An engagement protrusion 21 (hereinafter referred to as a reference pin) for plate positioning is provided at a position corresponding to a reference hole 20a provided in a thin printing plate 20 such as a 98 plate having a thickness of about 0.20 mm. The head 21' of the reference pin 21 has an outer diameter approximately equal to the reference hole 20a of the thin printing plate 20, and is wedge-shaped when viewed from the longitudinal direction of the plate cylinder 1. That is, the head 21' is formed to be inclined so as to become lower toward the side where the printing plate is caught.

In this embodiment, three reference pins 21 are provided on each of the clamp plates 1 to 12 on both sides of the plate cylinder 1, but the number of reference pins 21 is not limited to this and may be selected as appropriate. Needless to say, it would be a good idea to set one up.

Reference numeral 22 denotes a presser plate 1 to 1 to prevent the edge of the thin printing plate 20 from lifting up, and is formed by folding it into a dovetail shape, and covers the reference pin 21 on the upper surface of the clamp plate 12. The ring clamp measuring end is fixed by poles 1 to 24 as shown in FIG.

That is, one side of the presser plate 22 is connected to the reference pin 21.
It is bent at an angle that approximately matches the shape of the head 21'' (wedge shape), and the end on the clamp side is bent upward to facilitate insertion of the thin printing plate 20. , a hole 23 larger than the head 21'' of the reference pin 21 is provided on the surface of the presser plate 22 facing the reference pin 2.
2 and the holding plate 22 to fit the reference pin 21 and the reference hole 20a of the thin printing plate 20, the thin printing plate 20 is inserted through the hole 23 provided in the holding plate 22.
The reference hole can be inserted into the reference pin 21 while checking the relative position of the reference hole 20a and the reference pin 21.

In addition, the total length of the presser plate 22 is the clamp plate]2
The length may be determined according to the adjustment range of , and in this embodiment, the length is set to one or two clamp plates. Further, the reference pin 2 construction of this embodiment is illustrated as a headed pin having a head 21', but is not limited to this, and as shown in FIG. The L-shaped member 21a' may be attached with bolts or the like, or it may be a cylindrical pin 2], b as shown in FIG.

Further, the holding plate 22 is provided with a hole 23, which is formed by the reference pier 21. ．． 21a and 21b may have any shape as long as they can be visually confirmed, and if the holding plate 22 is made of a transparent material (such as plastic), the hole 23 does not necessarily need to be provided.

[Operation] Next, the operation of mounting a thin printing plate such as a paper plate by the printing plate mounting device of the present invention will be described.

First, a plate having a normal thickness, such as the base plate 25 or an alternative 98 plate, is mounted on the plate cylinder 1 using the grip side plate vise device 3 and the bottom side plate vise device 4. Therefore,
If a plate having a normal thickness, such as a 98 plate, is attached to the plate cylinder 1 in advance and can be used also as the cover 25, there is no need to install a new cover.

After attaching the matching plate 25 to the plate cylinder 1, as shown in FIG. and the bottom surface of the tip of the holding plate 22 in the direction of arrow a, and align the reference hole 20a of the thin printing plate 20 with the reference pin 21.

At this time, since the head 21' of the reference pin 2 is formed into a wedge shape that becomes thinner toward the insertion side of the printing plate 20, the insertion is performed smoothly, and the 22 The reference hole 20 of the thin printing plate 20 is formed by the hole 23 provided in the
It can be inserted while visually confirming the relative position of a and xi (the semi-pin 21).

If the thin printing plate 20 is inserted into the reference hole 20a or the reference pin 21, the printing plate 20 is pre-soaked with water.

The printing plate is attached to the plate cylinder 1 along the binding board 25 which has been coated with oil or glue or pasted with double-sided adhesive tape, and is pasted onto the binding board 25. In this way, the thin printing plate 20
is attached to the plate cylinder 1 via a fitting 25. If you want to adjust the position of the thin printing plate 20 and the plate cylinder 1,
This can be done by adjusting the positions of the plate vise bags W3 and 4 on the bite side and butt side that clamp the.

When removing a thin printing plate 20 such as a paper plate from the printing cylinder, remove the end of the printing plate from the printing cylinder 1, hold the end and pull it away from the printing cylinder 1. If you do it, print version 2
0 can be easily removed from the reference pin 21.

[Effects of the Invention] As detailed above, according to the present invention, by inserting the end of a thin printing plate such as a paper plate between the clamp plate and the presser plate, the end of the plate is aligned with the wedge shape of the positioning reference pin. The pin moves along the slope, and the pin can be easily and accurately fitted into the reference hole provided in the printing plate. In addition, when the reference hole provided at one end of the thin printing plate is inserted into the reference pin, it is pressed and held by the holding plate.
This has the effect of preventing the printing plate from coming off the reference pin or lifting up.

[Brief explanation of drawings]

Fig. 1 is a plan view of a plate cylinder of an offset printing press according to the present invention, Fig. 2 is an enlarged sectional view taken along the line ■ in Fig. 1, Fig. 3 is an enlarged view of section A in Fig. 2, and Fig. 4 5 is a partial plan view of the presser plate 22, FIG. 5 is a side sectional view of FIG. 4, and FIG. 6 is a partial plan view of the presser plate 22.
Figure 7 is a cross-sectional view taken along line ■ to ■ in Figure 1, Figure 8 is a cross-sectional view taken along line ■ in Figure 1, Figures 9 and 10 are different reference pins. Embodiment Figure 11 is a perspective view of a conventional paper plate number A'-1 play 1~, and Figure 12 is a view of the paper plate mounting plate 1 ~ being attached to a plate cylinder. 1... Plate cylinder 2... Notch portion 3.
4... Plate vise device 1.2, 1.3... Clamp plate 20... Printing plate 20a... Reference hole 21... Reference pin 22... Presser plate JP-A-3-61044 (5 ) Figure 9 12 Figure 7

Claims (1)

[Claims] 1) A plate positioning device for a printing press in which a plate vise device is housed in a notch formed along the longitudinal direction of the plate cylinder, and a clamp plate for clamping the printing plate is provided at the upper end of the plate vise device, On the top surface of the clamp plate of the bite side vise device,
A plate positioning protrusion that fits into a reference hole of a printing plate and a plate holding plate formed to cover the protrusion are provided, and the protrusion is inclined to become lower toward the gripping side of the printing plate. A printing plate mounting device for a printing press, characterized in that the plate mounting device is formed by