JPH0745322Y2 - 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.
Paper plates or resin plates are known.

Of these, the PS plate and the resin plate are thick, so it is possible to print a large number of prints, but on the other hand, it is more expensive than the paper plate, and it can be attached to and removed from the plate cylinder with a vise.
It had to be clamped on the plate cylinder, and the work of putting on and taking off was troublesome. For this reason, paper plates and thin PS plates have been used in recent years when the number of printed copies is small.However, these thin printing plates are less flexible than conventional PS plates and resin plates, and therefore are not suitable for the plate cylinder. Cannot be installed directly. Even if it is directly mounted on the plate cylinder, there is a risk 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 FIGS. 11 and 12, 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 mounted on the plate cylinder 50 in advance. An ordinary thick printing plate such as a plate is used as a plate 54 (this plate may be a plate that is no longer needed after use), and this plate is used as a support on the peripheral surface of the plate 52 thinner than the plate. Was hooked and mounted on the plate mounting plate 53.

Then, 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 replace the thin platen 52 with the platen 54. It was supposed to move together.

[Problems to be solved by the invention] The conventional plate mounting plate 53 is a printing plate 52 such as a paper plate or a thin PS plate.
When the plate is mounted on the plate cylinder 50, the holes 52 ′ of the printing plate 52 can be hooked on a large number of hooks 53 ′ provided on the plate mounting plate 53. If the plate becomes wavy during the hooking work, the hook 53 'once hooked
I was spending a lot of time on the plate installation work, often because it was out of the way.

Moreover, since the hook 53 is fixed by biting on the bite side vise 51, when using a normal PS plate without using a paper plate or a thin PS plate, it is between the vise table 5 and the clamp plate 13. It is very complicated because it is necessary to adjust the clearance 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 invention to provide a plate mounting device for a printing machine, which enables a thin printing 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, A plate positioning device of a printing machine, wherein a clamp plate for clamping a plate is provided on an upper end of the plate vise device. A plate positioning reference pin provided so as to be capable of projecting and retracting with respect to the upper surface of the clamp plate and a plate pressing plate for preventing lifting of the printing plate positioned on the reference pin are provided, and the reference pin is provided on the plate biting side. It is formed so as to be inclined toward the lower side.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 9.

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. As shown in FIG. 6, a dovetail groove is formed at the lower end of the vise table 5, 5'for engaging with an engaging piece 6 fixed by a bolt 7 to the bottom of the notch 2.

Therefore, the vise stands 5 and 5 ′ are restricted from being lifted from the bottom surface of the cutout portion 2 via the engagement 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.

Screw holes are formed in the vise bases 5 and 5'corresponding to the bolt holes 14, and the clamp plates 12 and 13 are held on the vise bases 5 and 5'by spherical bolts 15. Further, a groove 16 having a substantially semicircular cross section is formed over the entire length on the side opposite to the clamps of the vise stands 5, 5 ', and a clamp shaft 17 is pivotally 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. By rotating the eccentric shaft 19,
The butt plate vice device 4 can slide on the bite side plate vice device 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. As a result, the plate is attached to the plate cylinder.

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

According to the present invention, a paper plate or a 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 configured as described above.
An engaging projection piece 21 for plate positioning (hereinafter referred to as a reference pin) is provided at a position corresponding to a reference hole 20a provided in a thin printing plate 20 such as a PS plate.

The head 21b of the reference pin 21 has an outer diameter slightly smaller than the outer diameter of the main body 21a of the reference pin 21, and has an outer diameter substantially equal to the reference hole 20a of the thin printing plate 20. It is formed in a wedge shape when viewed from the direction.

That is, the inclined portion 21c of the head portion 21b is formed to be lower toward the bite side of the printing plate.

The clamp plate 12 is formed with a hole 22 into which the reference pin 21 is fitted, and the neck portion 22b of the hole 22 has the reference pin 21.
The outer diameter of the head portion 21b is approximately equal. Also,
A spring 23 for advancing and retracting the head portion 21b of the reference pin 21 to and from the upper surface of the clamp plate is housed in the hole 22 so as to come into contact with the bottom portion of the reference pin 21.

In the present embodiment, the reference pins 21 are provided on each of the clamp plates 12 on both sides of the plate cylinder 3 at three positions, but the number of the reference pins 21 is not limited to this and may be appropriately selected. It goes without saying that it should be provided. Further, the spring constant of the spring 23 is set to be smaller than the force that pushes the reference pin 21 into the hole 22 when inserting the plate 20 between the pressing plate 24 and the clamp plate 12, which will be described later. ing.

Reference numeral 24 denotes a holding plate for preventing the plate end portion of the thin printing plate 20 from rising, and the holding plate 24 is fixed to the upper surface of the clamp plate 12 by bolts 26 at the end opposite to the clamp side.

That is, the clamp side end of the presser plate 24 is bent upward so that the printing plate 20 can be easily inserted, and the facing portion of the reference pin 21 of the presser plate 24 is a hole 25 larger than the head 21b of the reference pin 21. Is formed so that the tip of the head portion 21b can protrude from the upper surface of the clamp plate 12.

The hole 25 formed in the pressing plate 24 is for projecting the tip of the head 21b of the reference pin 21 from the upper surface of the clamp plate 12, and the head 21b can project from the upper surface of the clamp plate 12. For example, as shown in FIG. 4 (b), it may be a notch 27 formed in a slit shape from the clamp side end of the clamp plate 12. Further, the total length of the pressing plate 24 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
A mounting operation of a printing plate such as a plate will be described.

First, the plate 28 which is the base of the plate cylinder 1 or a PS plate having a normal thickness which is no longer needed as a substitute is used by the bite side plate vise device 3 and the butt side plate vise device 4. Mounting. Therefore, when 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 install the plate 28. After mounting the plate 28 on the plate cylinder 1, a thin printing plate 20 such as a paper plate is attached as shown in FIG.
Insert the plate 20 in the direction of the arrow a between the upper end of the clamp plate 12 and the lower surface of the pressing plate 24 from the end on the side where the reference hole 20a is open, and use the reference hole 20a of the thin plate 20 as a reference. Align it with pin 21.

At that time, when the front end of the plate 20 passes between the holding plate 24 and the inclined portion 21c of the reference pin 21, the front end of the plate 20 tries to push up diagonally forward along the inclined portion 21c. However, since the upper end of the plate 20 is pressed by the pressing plate 24, the plate 20 moves straight between the clamp plate 12 and the pressing plate 24 without warping.

Then, the component force of the insertion force of the plate 20 in the direction of arrow a is
The inclined portion 21c and the pressing plate 24 act as a force to push the reference pin 21 downward, and the reference pin 21 descends along the hole 25.

After that, when the reference hole 20a of the printing plate 20 is brought right above the reference pin 21, the reference pin 21 projects from the upper surface of the clamp plate 12 by the elastic force of the spring 23 to accurately position the printing plate 20. At this time, since the presser plate 24 is provided with the hole 25, the reference hole 20a of the printing plate 20 and the reference pin 2 are provided through the hole 25.
It can be inserted while visually checking the relative position to 1.

When the reference hole 20a of the printing plate 20 is inserted into the reference pin 21, the printing plate 20 is preliminarily placed along the plate 28 on which water, oil, double-sided tape or glue is applied or pasted. Attach it to 1 and attach it to the plate 28. In this way, the plate 20 is mounted on the plate cylinder 1 via the plate 28.

If you want to adjust the position of the plate 20 and the plate cylinder 1,
Plate vise device 3 on the bite side and the butt side that clamps the plate 28,
It can be done by adjusting the position of 4.

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 end portion of the plate is held and pulled in a direction away from the plate cylinder 1. Since 20a breaks, it can be easily removed.

In the above-mentioned embodiment, the reference pin 21 for positioning the plate on the upper surface of the clamp plate 12 can be retracted by the spring 23, but as shown in FIG. Attach it with bolts 26 etc. so that its upper surface is in the same plane as the upper surface of the clamp plate 12,
A reference pin 30 for positioning the printing plate is fixed to the tip of the leaf spring 29, and a concave groove 31 is provided on the upper surface of the clamp plate 12 so that the leaf spring 29 can swing about the mounting portion. It is also possible that the clamp can be retracted from the clamp plate 12.

[Effect of the Invention] As described in detail above, according to the present invention, a paper plate or a thin plate is used.
By inserting the plate edge of the PS plate between the clamp plate and the pressing plate, the reference pin is pulled in from the upper surface of the clamp plate, and when the reference hole of the plate and the reference pin are aligned, the pin is the upper surface of the clamp plate. Since it further projects and fits into the reference hole naturally, the reference hole and the reference pin of the printing plate can be fitted easily and accurately.

Further, when the reference hole provided at one end of the printing plate is inserted into the reference pin and held by pressing it by the presser plate, the plate does not come off the reference pin or float up after the insertion. There is.

[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. (A) and (b) are partial plan views of the presser plate 24, FIG. 5 is a side sectional view of FIG. 4, FIG. 6 is a sectional view taken along line VI of FIG. 1, and FIG. 7 is FIG. VII ~ V
A sectional view taken along line II, FIG. 8 is a sectional view taken along line VIII of FIG. 1, FIG. 9 is another embodiment of the present invention, FIG. 10 is a perspective view of a conventional plate mounting plate, and FIG. The figure shows the paper plate mounting plate mounted on the plate cylinder. 1 ... Plate cylinder 2, Notch 3,4 ... Plate vise device 12,13 ... Clamp plate 20 ... Plate, 21,30 ... Reference pin 23 ... Spring, 24 ... Presser plate 29 ... Leaf spring

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 plate positioning reference pin that is fitted into a reference hole of a printing plate on the upper surface of the clamp plate of the bite-side plate vise device and that can be retracted from the upper surface of the clamp plate, and is positioned on the reference pin. Plate holding plate for preventing floating of the plate, and the reference pin is formed so as to be inclined so as to become lower toward the bite side of the plate. apparatus.