JP2559188Y2 - 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, when the number of prints is small in recent years, a thin plate such as a paper plate is used.

Conventionally, when a thin plate such as a paper plate is used, as shown in FIGS. 9 and 10, a thin plate 52 such as a paper plate is attached to the upper surface of a biting vice 51 of a plate cylinder 50. A plate having a normal thickness such as a PS plate previously mounted on the plate cylinder 50 is provided as a plate 54 (this plate may be a plate that becomes unnecessary after use). Using this as a support, a thin 52 such as a paper plate thinner than the plate is hooked on the plate mounting plate 53 and mounted on the peripheral surface thereof.

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, the vise table 55 and the clamp plate 56 are not used when using a normal PS plate without using a paper plate or a thin PS plate. It is very complicated because it is necessary to adjust the gap between the two using spherical bolts.

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 printing plate mounting device for a printing press according to the present invention is provided on a plate cylinder, the plate fixing being recessed from the peripheral surface of the plate cylinder along the longitudinal direction thereof. A plate positioning reference pin which fits into a reference hole of the printing plate on the upper surface of the plate fixing portion, and the reference pin is provided on a main body portion for positioning the printing plate and on an upper end of the main body portion. And a locking head for preventing the printing plate from floating, the height of the main body portion in contact with the reference hole of the printing plate is made substantially equal to the thickness of the printing plate, and the reference pin is provided. Is formed so that it can be reduced in the radial direction, is slightly larger than the reference hole of the printing plate, and 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 is provided with a cutout 2 over the entire length of the cylinder.

Here, the fixed side of the printing plate 5 with respect to the notch 2 of the plate cylinder 1 is referred to as the front, and the opposite side is referred to as the rear. In front of the notch 2, a cylinder plate fixing portion 3 is formed which is recessed from the peripheral surface of the plate cylinder 1 along the longitudinal direction of the plate cylinder 1,
Behind the notch 2, along the longitudinal direction of the plate cylinder 1,
Are formed from the peripheral surface of the plate.

On the upper surface of the plate fixing portion 3 of the plate cylinder 1, a paper plate or a thickness
Reference hole 5a of thin printing plate 5 such as PS plate of about 0.15mm to 0.24mm
Is provided at a position corresponding to the reference position, and a plate positioning reference pin 6 integrally formed of an elastic material such as synthetic resin or rubber.

The reference pin 6 is composed of a main body 7 for positioning the printing plate 5 and a locking head 9 provided at the upper end of the main body 7 for preventing the printing plate 5 from floating. ing. The main body 7 of the reference pin 6 has an outer diameter substantially equal to that of the reference hole 5a of the printing plate 5, and the height of the main body 7 in contact with the reference hole 5a of the printing plate 5 is substantially equal to the thickness of the printing plate 5. Is formed with a screw portion 8. A head 9 of the reference pin 6 is formed at an upper end of the main body 7 of the reference pin 6. The head 9 has a shaft 10 extending upward from the center of the upper end of the main body 9, and a plurality of elastic legs 11 radially projecting downward from the tip of the shaft 10. The outer shape of the lower end of each elastic leg 11 is
5a, the reference hole 5a of the printing plate 5 is pushed in from above, and the reference hole 5a is
When fitted to 11, the elastic leg 11 is bent inward by its elastic force so as to reduce the outer diameter, and has a diameter substantially equal to the inner diameter of the reference hole 5a.

In this embodiment, the reference pin 6 is the plate fixing portion 3 of the plate cylinder 1.
At each end of the upper surface, a total of 6
Although the number of the reference pins 6 is provided, the number of the reference pins 6 is not limited to six, and may be appropriately selected and provided.

Further, although the reference pin 6 is exemplified by the six elastic legs 11, the number of the elastic legs 11 is not limited to six, and may be appropriately selected and formed. Furthermore, the reference pin 6
Although the screw portion 8 is screwed into the plate cylinder 1, the screw portion 8 may be formed into a cylindrical shape and pressed into the plate cylinder 1 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.

As shown in FIGS. 3 to 5, the reference hole 5a of the thin printing plate 5 such as a paper plate is aligned with the reference pin 6 and pushed in from above. At this time, since the diameter of the reference hole 5a of the printing plate 5 is slightly smaller than the outer diameter of the lower end of the reference pin 6, when the printing plate 5 passes through the elastic leg 11, the elastic leg 11 By 5a, the lower end is bent inward with the upper end as a fulcrum. (The outer diameter is reduced.) If the reference hole 5a of the printing plate 5 passes through the elastic leg 11,
The elastic leg 11 returns to its original shape by its elastic force. Accordingly, the outer diameter of the lower end portion of the elastic leg 11 is slightly larger than the inner diameter of the reference hole 5a of the printing plate 5, and the upper surface of the printing plate 5 is pressed by the lower end surface 12 of the elastic leg 11 to lift the printing plate 5. To prevent.

After the reference hole 5a of the printing plate 5 is fitted in the main body 7 of the reference pin 6 in this manner, the printing plate 5 is preliminarily coated with water, oil, or glue or pasted with a double-sided adhesive tape. It is attached so as to be wound around the cylinder 1 and attached to the plate cylinder 1.

 Therefore, the printing plate 5 is directly mounted on the plate cylinder 1.

When removing a thin printing plate 5 such as a paper plate or a thin PS plate from the plate cylinder 1, remove the plate bottom of the printing plate 5 from the plate cylinder 1 and hold the plate bottom from the plate cylinder 1. The printing plate 5 can be easily removed by pulling it away from the printing plate.

In the above-described embodiment, an example in which the reference pin 6 is integrally formed is shown. However, as shown in FIG.
The head 9 of the reference pin 6 and the head 9 of the reference pin 6 may be separately manufactured, and the head 9 may be attached to the upper surface of the main body 7 with bolts or the like.

Further, as shown in FIG. 8, the head 9 of the reference pin 6 may have a truncated conical shape. 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 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 a portion A in FIG. 2, and FIG. 6 is an operation view in which a reference hole of a printing plate is inserted into a reference pin. FIG. 6 is a plan view of FIG. FIG. 9 is a perspective view of a conventional paper plate mounting plate, and FIG. 10 is a diagram in which the paper plate mounting plate is mounted on a plate cylinder. DESCRIPTION OF SYMBOLS 1 ... Plate cylinder 2 ... Notch 3 ... Plate fixing part 4 ... Plate bottom 5 ... Printing plate 6 ... Reference pin 7 ... Reference pin main body 9 ... Reference pin head Department

 ──────────────────────────────────────────────────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 fixing portion is formed on a plate cylinder along a longitudinal direction thereof, the plate fixing portion being recessed from a peripheral surface of the plate cylinder.
A plate positioning reference pin that fits into the printing plate reference hole is provided,
The reference pin includes 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 contact with the hole 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 is formed slightly larger than the reference hole of the printing plate. A plate mounting device for a printing press, characterized in that the portion is formed to be 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.