JP2559187Y2 - Plate mounting device for printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a printing press, and more particularly to a printing plate mounting device for mounting a printing plate on a plate cylinder of an offset printing press.

[Prior Art] Generally, an aluminum PS plate (Presensitized Plat) is used as a printing plate mounted on a plate cylinder of an offset printing press.
e) Paper or resin plates are known.

Of these, the PS plate and the resin plate are thick, so they can print a large number of prints, but on the other hand, they are more expensive than the paper plate, and the plate cylinder is attached and detached with a vise. It had to be clamped to the torso, and the work of attaching and detaching was troublesome. For this reason, thin plates such as paper plates have been used in recent years when the number of prints is small, but thin plates such as paper plates are weaker than conventional PS plates and resin plates, so they are directly attached to the plate cylinder. Cannot be installed.

Also, even if it is directly mounted on the plate cylinder, wrinkles may occur due to position adjustment after mounting on the plate cylinder.

Conventionally, when using a thin plate such as a paper plate,
As shown in FIGS. 13 and 13, a plate mounting plate 53 for mounting a thin plate 52 such as a paper plate is provided on the upper surface of the vice 51 on the biting side of the plate cylinder 50, and a PS plate previously mounted on the plate cylinder 50 is provided. A plate having a normal thickness, such as a plate 54 (this plate may be a plate that is no longer required after use) may be used as a support, and a paper plate or the like having a thinner peripheral surface than the plate Was attached to the plate mounting plate 53 by hooking it.

When adjusting the position of the thin printing plate 52 with respect to the plate cylinder 50, the plate plate 54 having the same thickness as that of the normal plate is used.
And the thin printing plate 52 is moved integrally with the base plate 54.

[Problem to be Solved by the Invention] The conventional plate mounting plate 53 is provided with a hole 52 'of the plate 52 in the plate mounting plate 53 when a thin plate 52 such as a paper plate is mounted on the plate cylinder 50. As it is designed to be hooked on a large number of hooks 53 ', it is difficult to hook when the plate is wide, and if the plate is wavy during the hooking work, it often comes off from the hook 53' once hooked. A lot of time was spent on plate installation.

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

Therefore, in the printing of a small lot using a conventional thin printing plate, the work efficiency is remarkably reduced, for example, the printing plate replacement time is longer than the actual printing time.

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

[Means for Solving the Problems] In order to achieve the above object, a plate mounting device for a printing press according to the present invention accommodates a plate vice device in a notch formed along a longitudinal direction of a plate cylinder, In a plate positioning device for a printing press provided with a clamp plate for clamping a plate at an upper end of the plate vise, a plate positioning to be inserted into a reference hole of the plate on an upper surface of a clamp plate of a biting plate vise. A reference body pin, the reference pin comprising: a main body for positioning the printing plate; and a locking head provided at an upper end of the main body for preventing the printing plate from floating. The height of the reference pin in contact with the reference hole of the printing plate is made substantially equal to the thickness of the printing plate, and the head of the reference pin can be reduced in the radial direction, and formed slightly larger than the reference hole of the printing plate. That is, the tip of the head is tapered. Further, the main body and the head may be formed of different members.

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

In the figure, reference numeral 1 denotes a plate cylinder. The plate cylinder 1 has a cutout 2 for accommodating plate vice devices 3 and 4 on the biting side and the rear side of the plate over the entire length of the cylinder.
Is provided. In the notch 2, a vise table 5, 5 'slightly shorter than the entire length and formed in a substantially rectangular cross section is accommodated. As shown in FIG. 7, a dovetail groove is formed at the lower end of the vise table 5, 5 'so as to fit into an engagement piece 6 fixed to the bottom of the notch 2 with a bolt 7. Therefore, vise stand 5,
5 'is restricted from rising from the bottom surface of the notch 2 via the engagement piece 6.

Reference numerals 8 and 9 denote bolts for positioning the vise stands 5, 5 'with respect to the plate cylinder 1, and a plurality of bolts are provided in the longitudinal direction of the vise stands 5, 5'. Reference numeral 10 denotes a compression spring inserted into the opposing hole 11 of the vise table 5, 5 ', and biases the vise table 5, 5' in a direction approaching the wall surface of the notch 2.

Reference numerals 12 and 13 denote clamp plates formed to divide the vise tables 5, 5 'into approximately four equal parts in the longitudinal direction of the plate cylinder. Each of the clamp plates 12, 13 has a bolt hole having a spherical concave seat. 14 are drilled in two places each.

Screw holes are formed in the vise tables 5, 5 'so as to correspond to the bolt holes 14, and the clamp plates 12, 13 are held on the vise tables 5, 5' by spherical bolts 15. Also,
A groove 16 having a substantially semicircular cross-section is formed over the entire length of the vise table 5, 5 'on the side opposite to the clamp, and a clamp shaft 17 is supported in the groove 16.

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

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

On the other hand, an eccentric shaft 19 is provided between the clamp-side end face of the buttocks vise 5 'and the side face of the notch 2 over the entire length of the plate cylinder 1.
By rotating the eccentric shaft 19, the plate-side vise device 4 on the rear side can slide toward the plate-vise device 3 on the biting side.

Therefore, PS having a normal thickness by the plate vise 3
After biting one end of a plate or a resin plate, the plate is wound around the plate cylinder 1 and the other end is fixed by the plate vise device 4 on the rear side.

 The above configuration is the same as that of the conventional plate cylinder device.

In the present invention, a position corresponding to the reference hole 20a of a thin printing plate 20 such as a paper plate or a PS plate having a thickness of about 0.15 mm to 0.24 mm is provided on the upper surface side of the clamp plate 12 of the plate cylinder 1 thus configured. In addition, a reference pin 21 for plate positioning, which is integrally formed of an elastic material such as a synthetic resin or rubber, is provided.

The reference pin 21 is a main body for positioning the printing plate 20.
And a locking head 24 provided at the upper end of the main body 22 for preventing the printing plate 20 from floating. The main body portion 22 of the reference pin 21 has an outer diameter substantially equal to the reference hole 20a of the printing plate 20, and makes the height in contact with the reference hole 20a of the printing plate 20 substantially equal to the thickness of the printing plate 20. Is formed with a screw portion 23. The head 24 has a shaft 25 extending upward from the center of the upper end of the main body 24, and a plurality of elastic legs 26 projecting radially downward from the tip of the shaft 25. The outer shape of the lower end composed of each elastic leg 26 is formed so as to have a slightly larger diameter than the reference hole 20a of the printing plate 20, and the reference hole 20a of the printing plate 20 is pushed in from above to make the reference hole. When the elastic leg 26a is fitted to the elastic leg 26, the elastic leg 26 is bent inward so as to reduce the outer diameter by its elastic force, and has a diameter substantially equal to the inner diameter of the reference hole 20a.

In this embodiment, three reference pins 21 are provided on the clamp plates 12 on both sides of the plate cylinder 1, respectively. However, the number of the reference pins 21 is not limited to this and may be appropriately selected and provided. Just do it.

Further, the reference pin 21 is exemplified by one having six elastic legs 26, but the number of elastic legs 26 is not limited to this, and may be appropriately selected and formed. In addition, the reference pin
Although the screw portion 23 is screwed into the clamp plate 12, the screw portion 23 may be formed into a cylindrical shape and pressed into the clamp plate 12 so as to be held by elastic force.

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

First, a base plate 28 serving as a base, or a plate having a normal thickness such as a PS plate as a substitute for the base plate 28 is mounted on the plate cylinder 1 by a biting-side plate vise device 3 and a rear-side plate vise device 4. Therefore, if a plate having a normal thickness such as a PS plate is previously mounted on the plate cylinder 1 and can be used as the plate 28, it is not necessary to newly mount the plate 28.

After the plate 28 is mounted on the plate cylinder 1, the reference holes 20a of the thin printing plate 20 such as a paper plate are aligned with the reference pins 21 and pushed in from above as shown in FIGS. At that time, the reference hole 20a of the printing plate 20
Is slightly smaller than the outer diameter of the lower end of the reference pin 21, so that when the plate 20 passes through the elastic legs 26, the elastic legs 26
The lower end is bent inward with the upper end serving as a fulcrum by the twenty reference holes 20a. (The outer diameter is reduced.) When the reference hole 20a of the printing plate 20 passes through the elastic leg 26, the elastic leg 26 returns to its original shape by its elastic force. Accordingly, the outer diameter of the lower end of the elastic leg 26 is
The lower end surface 2 of the elastic leg 26 has a diameter slightly larger than the inner diameter of 20a.
The upper surface of the printing plate 20 is pressed by 7 to prevent the printing plate 20 from floating.

After the reference hole 20a of the printing plate 20 is fitted in the main body 22 of the reference pin 21 in this manner, the printing plate 20 is preliminarily coated with water, oil, or glue on the entire surface or pasted with a double-sided adhesive tape. It is mounted on the plate cylinder 1 along the plate 28 and attached to the plate 28.

Therefore, the printing plate 20 is securely mounted on the plate cylinder 1 via the plate 28. If the position of the printing plate 20 and the plate cylinder 1 is to be adjusted, the normal plate can be adjusted by adjusting the positions of the vice devices 3 and 4 on the biting side and the rear side which clamp the platen 28. Can be performed in the same manner as when the camera is mounted.

When removing a thin printing plate 20 such as a paper plate or a thin PS plate from the plate cylinder 1, remove the end of the printing plate from the plate cylinder 1, and hold the end portion away from the plate cylinder 1. The printing plate 20 can be easily removed because the reference hole 20a is broken.

In the above-described embodiment, an example in which the reference pin 21 is integrally formed is shown. However, as shown in FIG.
The head 24 of the reference pin 21 and the head 24 may be separately manufactured, and the head 24 may be attached to the upper surface of the main body 22 with bolts or the like. In this case, the material of the main body 22 is made of a synthetic resin, a metal, or the like, and the material of the head portion 24 is made of a synthetic resin (a metal may be used if it can be made of a metal).

Further, as shown in FIG. 11, the head 24 of the reference pin 21 may have a shape in which the upper surface of a cone is cut. In this case, it is preferable to use a resilient material such as synthetic rubber or raw rubber.

[Effects of the Invention] As described in detail above, according to the invention, the printing plate can be positioned only by inserting the reference holes of the thin printing plate such as a paper plate into alignment with the reference pins. The plate can be quickly and accurately mounted. Moreover, when the reference hole of the printing plate is inserted into the reference pin, the upper surface of the printing plate is pressed by the lower end surface of the head of the reference pin, and the printing plate can be prevented from floating. Therefore, there is an effect of reliably preventing the printing plate from coming off the reference pin. Further, since the reference pin is provided on the upper surface of the clamp plate, there is no hindrance to the work of mounting the printing plate by the plate vise.

Further, since the head of the reference pin is detachable from the main body of the reference pin, the head can be easily replaced when the head is damaged or worn.

[Brief description of the 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 line II of FIG. 1, and FIGS.
FIG. 5 is an enlarged view of part A of FIG. 2, and is an operation view in which the reference hole of the paper plate 20 is inserted into the reference pin 21, FIG. 6 is a plan view of FIG. 3, and FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 1, FIG. 9 is a sectional view taken along line IX in FIG. 1, and FIGS. FIG. 12 is a perspective view of a conventional plate mounting plate, and FIG.
The figure shows a paper plate mounting plate mounted on a plate cylinder. 1 ... plate cylinder, 2 ... notch 3,4 ... plate vise device 12,13 ... clamp plate 20 ... printing plate, 21 ... reference pin 22 ... ... reference pin main body, 24 ... Reference pin head

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 62-63031 (JP, U) Japanese Utility Model Sho 61-52705 (JP, U) Japanese Utility Model Sho 60-38740 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A plate positioning device for a printing press, wherein a plate vise is accommodated in a notch formed along a longitudinal direction of a plate cylinder, and a clamp plate for clamping a plate is provided at an upper end of the plate vise. In the device, on the upper surface of the clamp plate of the bite-side plate vise device, provided a plate positioning reference pin that fits into the reference hole of the printing plate, the reference pin, a main body for positioning the printing plate,
And a locking head provided at the upper end of the main body to prevent the printing plate from floating, and the height of the main body contacting the reference hole of the printing plate is substantially equal to the thickness of the printing plate. And the head of the reference pin can be radially reduced, and
A plate mounting device for a printing press, wherein the plate is formed slightly larger than a reference hole of the plate and the tip of the head is tapered. 2. A printing plate mounting apparatus for a printing press according to claim 1, wherein said main body and said head are formed as separate members.