JPH0745323Y2 - Plate attachment device for printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plate mounting apparatus for mounting a plate on a plate cylinder of a printing machine, particularly an offset printing machine.

[Prior Art] Generally, a PS plate (presensitized plate) made of aluminum is used as a printing plate mounted on a plate cylinder of an offset printing machine.
Alternatively, a paper plate or a resin plate is known.

Of these, the PS plate and resin plate can print a large number of prints because of the thick plate, but on the other hand, it is more expensive than the surface plate and it can be attached to and detached from the plate cylinder with a vise. I had to bite and clamp it on the plate cylinder, and I had to put on and take off work. For this reason, thin printing plates such as paper plates have been used in recent years when the number of printed copies is small.However, since thin printing plates are less rigid than conventional PS plates and resin plates, they are attached directly to the plate cylinder. Can not do it. Further, even if it is directly mounted on the plate cylinder, there is a fear that wrinkles may occur due to position adjustment after mounting on the plate cylinder.

Therefore, conventionally, when using a thin printing plate such as a paper plate,
As shown in Fig. 10 and Fig. 10, a plate mounting plate 53 for mounting a thin printing plate 52 such as a paper plate is provided on the upper surface of the vise side vise 51 of the plate cylinder 50, and the PS plate previously mounted on the plate cylinder 50. An ordinary thick plate such as the plate is used as a plate 54 (this plate may be a plate that is no longer needed after use), and the plate 52 thinner than the plate is used as a support on the peripheral surface. It was attached by hooking on the plate mounting plate 53.

When adjusting the position of the thin printing plate 52 with respect to the plate cylinder 50, the platen 54 having the same thickness as the normal plate is moved to integrate the thin platen 52 with the platen 54. It was supposed to be moved.

[Problems to be Solved by the Invention] When a thin plate 52 such as a paper plate or a thin PS plate is attached to the plate cylinder 50, a conventional plate mounting plate 53 has a hole 52 ′ in the plate 52.
Is hooked on a large number of hooks 53 'provided on the plate mounting plate 53, so it is difficult to hook if the plate is wide, and if the plate is wavy during hooking work, it will be hooked once. Since it often comes off from the hook 53 ', a lot of time was spent on the plate mounting work.

Moreover, since the hook 53 ′ is fixed by biting on the vise side vise 51, when using a normal PS plate without using a paper plate or a thin PS plate, the vise table 5 and the clamp plate 13 It is very complicated because it is necessary to adjust the gap between the spherical bolts 15.

Therefore, in small lot printing using conventional thin printing plates,
The plate replacement time is longer than the actual printing time,
This resulted in a significant decrease in work efficiency.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a plate mounting device for a printing machine, which enables a thin plate such as a paper plate to be mounted on a plate cylinder quickly, easily and accurately. .

[Means for Solving the Problems] In order to achieve the above object, a plate mounting device of a printing machine according to the present invention stores a plate vise device in a notch formed along a longitudinal direction of a plate cylinder, In a plate positioning device of a printing machine, which is provided with a clamp plate for clamping a plate at the upper end of the plate vise device, a pressing plate for pressing the end of the plate on the upper surface of the clamp plate of the bite side vise device, A plate positioning reference pin that fits into a reference hole of the plate and a groove into which the reference pin can be inserted are provided at a position facing the reference pin of the clamp plate on the lower surface of the pressing plate, and the reference pin is on the plate biting side. It is formed to be inclined so that it becomes lower toward.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 8.

In the figure, 1 is a plate cylinder, and the plate cylinder 1 is provided with notches 2 for accommodating the plate vise devices 3, 4 on the bite side and the butt side of the plate over the entire length of the cylinder. In the notch 2, there are housed vise stands 5, 5'which are slightly shorter than their entire length and are formed in a substantially rectangular cross section. At the lower end of the vise base 5, 5 ', as shown in FIG. 6, an engaging piece 6 fixed to the bottom of the notch 2 by a bolt 7.
Is formed with a dovetail groove. Therefore, the vise stand 5,
5'is prevented from rising from the bottom surface of the cutout portion 2 through the engaging piece 6.

Denoted at 8 and 9 are bolts for positioning the vise tables 5, 5'with respect to the plate cylinder 1, and a plurality of bolts are provided in the longitudinal direction of the vise tables 5, 5 '. 1
0 is a compression spring inserted into the opposing holes 11 of the vise stand 5, 5 ',
The vise stands 5, 5'are urged in the direction of approaching the wall surface of the notch 2. Clamp plates 12 and 13 are formed to have a length that divides the vise table 5 and 5 ′ into approximately four equal parts in the longitudinal direction of the plate cylinder. Each clamp plate 12 and 13 has a bolt hole having a spherical concave seat. 14 are drilled in two places each. The vise stand
Screw holes are formed in 5, 5'corresponding to the bolt holes 14, and the clamp plates 12, 13 are held on the vise bases 5, 5'by the spherical bolts 15. In addition, on the side opposite to the clamps of the vise bases 5, 5 ', a groove 16 having a substantially semicircular cross section over the entire length
Is formed, and the clamp shaft 17 is axially supported in the groove 16.

A notch 18 having an L-shaped cross section is formed on the clamp shaft 17, and by rotating the clamp shaft 17, the end edges of the clamp plates 12 and 13 are engaged with the notch 18. Has become.

Therefore, the clamp plates 12 and 13 are pivotally supported by the spherical bolt 15 and the spherical concave seat so that they can swing.

On the other hand, the clamp side end face of the rear side vise 5'and the notch 2
An eccentric shaft 19 is provided over the entire length of the plate cylinder 1 between the side surface of the plate cylinder 1 and the side surface of the plate cylinder 1. It can slide on the 3 side.

Therefore, after one end of a PS plate or a resin plate having a normal thickness is bitten by the plate vise device 3, it is wound around the plate cylinder 1 and the other end is fixed by the plate vise device 4 on the hip side. It is like this.

The above configuration is similar to that of the conventional plate cylinder device.

The present invention prevents the edge of the thin printing plate 20 such as a paper plate or a PS plate having a thickness of 0.15 mm to 0.24 mm from being lifted on the upper surface side of the clamp plate 12 of the plate cylinder 1 configured as described above. A pressing plate 21 is provided for this purpose. The end of the holding plate 21 opposite to the clamp side is fixed to the upper surface of the clamp plate 12 by a bolt 22, and the end of the holding plate 21 on the clamp side is bent upward so that the plate 20 can be easily inserted. The lower surface of 21 has a reference hole 20
An engaging projection piece 23 for plate positioning (hereinafter referred to as a reference pin) is provided at a position corresponding to a.

The reference pin 23 has an outer diameter almost equal to that of the reference hole 20a of the printing plate 20, is formed in a wedge shape when viewed from the longitudinal direction of the plate cylinder 1, and the reference pin 23 bites the printing plate. It is formed so that it becomes lower toward the side. On the upper surface side of the clamp plate 12, a concave groove 24 is provided at a position facing the reference pin 23, and the concave groove 24 is formed so that the reference pin 23 can be inserted.

In the present embodiment, the reference pins 23 are provided on the press plates 21 on both sides of the plate cylinder 3 at three positions, but the number of the reference pins 23 is not limited to this, and an appropriate number may be provided. Just go. Further, the bending force of the presser plate 21 is
It is set so that it can be easily bent by the pushing force of the printing plate 20 when it is inserted between the holding plate 21 and the clamp plate 12.

Further, the total length of the presser plate 21 may be determined according to the adjustment range of the clamp plate 12, and in the embodiment, the length is equivalent to two clamp plates.

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

First, the plate cylinder 1 serving as a base or a plate having a normal thickness such as a PS plate which is an alternative to the plate cylinder 1 on the plate cylinder 1
And the plate vise device 4 on the hip side. Therefore, in advance
When a plate having a normal thickness such as a PS plate is mounted on the plate cylinder 1 and can also be used as the plate 25, it is not necessary to newly install the plate. After mounting the base plate 25 on the plate cylinder 1, as shown in FIG.
Is inserted in the direction of arrow a between the upper surface of the plate and the lower surface of the tip of the pressing plate 21, and the reference hole 20a of the thin plate 20 is aligned with the reference pin 23.

At that time, when the tip of the printing plate 20 passes between the holding plate 21 and the head inclined part of the reference pin 23, the press plate 21 is pressed by the head inclined part of the reference pin 23 to hold the bolt 22. It is pushed upwards around.

After that, when the reference hole 20a of the printing plate 20 is brought directly below the reference pin 23, the reference pin 23 enters the reference hole 20a of the printing plate 20 by the restoring force due to the elasticity of the pressing plate 21 and accurately positions the printing plate 20. To do.

When the reference hole 20a of the printing plate 20 enters the reference pin 23, the printing plate 20
Beforehand, apply water, oil or glue to the entire surface, or attach it to the plate cylinder 1 along the plate 25 with double-sided adhesive tape attached,
Stick it on the plate 25.

In this way, the printing plate 20 is mounted on the plate cylinder 1 via the plate 25. If the positions of the thin printing plate 20 and the plate cylinder 1 are adjusted, the positions of the plate vise devices 3, 4 on the bite side and the butt side that clamp the plate 25 are adjusted. be able to.

When the plate 20 is to be removed from the plate cylinder 1, the end of the plate is removed from the plate cylinder 1, and the plate 20 is pulled by holding the end in a direction away from the plate cylinder 1 so that the plate 20 has a reference hole 20a. Since it breaks, it can be easily removed.

When the plate 20 is mounted on the plate cylinder 1, the pressing plate 21 may bend upward only at the position where the reference pin 23 is attached. Therefore, as shown in FIG.
If a slit 26 is provided in the vicinity of the attachment portion of 23 along the bending direction of the pressing plate 21, that portion can be easily bent.

In addition, if the presser plate 21 is made of a transparent material (plastic or the like), the plate 20 can be installed when it is mounted on the plate cylinder 1.
Since the reference hole 20a can be visually confirmed, the plate can be mounted more easily.

[Effect of the Invention] As described in detail above, according to the present invention, the reference pin bends above the pressing plate by inserting the end of a thin printing plate such as a paper plate between the clamp plate and the pressing plate. When the plate retracts upward from the upper surface and the reference hole of the plate and the reference pin match, the pin penetrates the reference hole and is inserted into the concave groove on the upper surface of the clamp plate, so the reference hole and the reference pin naturally fit. Since they are matched, the reference hole and the reference pin of the printing plate can be easily aligned.

Further, when the reference hole provided at one end of the printing plate enters the reference pin and is pressed and held by the pressing plate, the printing plate does not come off the reference pin or float up.

[Brief description of drawings]

1 is a plan view of a plate cylinder of an offset printing machine according to the present invention, FIG. 2 is an enlarged sectional view taken along line II of FIG. 1, FIG. 3 is an enlarged view of part A of FIG. 2, and FIG. Is a partial plan view of the presser plate 21, FIG. 5 is a side sectional view of FIG. 4, and FIG. 6 is VI of FIG.
7 is a sectional view taken along line VII-VII in FIG. 1, FIG. 8 is a sectional view taken along line VIII in FIG. 1, and FIG. 9 is a perspective view of a conventional paper plate mounting plate. Figures and 10 show the paper plate mounting plate mounted on the plate cylinder. 1 ... Plate cylinder, 2 ... Notch part 3, 4 ... Plate vise device 12, 13 ... Clamp plate 20 ... Plate, 21 ... Press plate 22 ... Bolt, 23 ... Reference pin 24 ... Recessed groove

Claims (1)

[Scope of utility model registration request] 1. A printing plate positioning apparatus for a printing press, wherein a plate vise device is housed in a notch formed along a longitudinal direction of a plate cylinder, and a clamp plate for clamping the plate is provided at an upper end of the plate vise device. In the device, a holding plate that holds the end of the printing plate on the upper surface of the clamp plate of the bite side plate vise device, a plate positioning reference pin that fits into the reference hole of the printing plate on the lower surface of the holding plate, and the clamp plate A printing plate of a printing press, characterized in that a recessed groove into which a reference pin can be inserted is provided at a position facing the reference pin, and the reference pin is formed so as to be inclined toward the bite side of the printing plate. Mounting device.