JP2981442B2 - Plate locking device, plate cylinder having the locking device, and offset printing press having the plate cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate locking device which can be easily and detachably mounted on a clamp plate of a plate vise of an offset printing press plate cylinder, and more particularly to a plate mounting / removing operation. The present invention relates to a plate locking device capable of remarkably improving the printing property, a plate cylinder using the same, and an offset printing press.

[0002]

2. Description of the Related Art An apparatus for mounting a printing plate at a predetermined position on the outer peripheral surface of a printing drum is disclosed in Japanese Utility Model Publication No. Hei 6-11792 and Japanese Patent Laid-Open Publication No. Hei 6-328669. The plate mounting device described in these publications uses a plate in which a plurality of circular locking holes (reference holes) are formed in rows in the width direction at both ends in the longitudinal direction, while the plate cylinder of the plate cylinder is used. A plate locking pin (reference pin) is provided in a part of the force device, and the plate locking pin is inserted into a locking hole of the plate to perform positioning and locking of the plate.

[0003] In particular, in the plate mounting device described in Japanese Utility Model Publication No. Hei 6-11782, a locking pin projecting from the upper surface of a clamp plate of a plate vise is inserted into a plate locking hole from below the plate. Further, a plate holding plate for pressing the plate against the upper surface of the clamp plate of the plate vise is provided so as to cover the plate locking pin. Therefore, although the plate mounting work is improved, the exposed pins and the plate holding plate are liable to injuries by the operator, and the plate is bent along the plate cylinder when the plate is mounted on the plate cylinder. There was a drawback that the printing plate was lifted by the reaction force of the printing plate, and the printing plate slipped out and easily came off the locking pin.

Further, when the printing plate is lifted up to remove it from the plate cylinder after printing is completed, the locking hole of the printing plate is pressed against the upper surface of the clamp plate, and the printing plate is hard to be detached from the locking pin. Japanese Utility Model Publication No. Hei 6-11782 describes that a paper plate is pulled, a locking hole of the paper plate is broken, and the paper plate is detached from a plate locking pin. However, the above drawbacks are difficult to overlook when the printing plate is a plastic plate or an aluminum plate that is more elastic than the paper plate and hard to break. Also, in the case of a plastic plate or an aluminum plate, a plate that has been used once may be reused, but if it is broken, it cannot be reused.

On the other hand, in the plate mounting apparatus described in Japanese Patent Application Laid-Open No. 6-328669, a locking plate and a plate holding plate provided as needed are provided between a vise table and a clamp plate. However, a new mode in which the plate locking pin is inserted from the upper side to the lower side of the printing plate has been disclosed. As described above, by adopting a form in which the plate locking pin is inserted from the upper side of the plate, the plate is formed by the reaction force of the plate bent along the plate cylinder when the plate is mounted on the plate cylinder. Although the drawback that the plate is lifted up and the plate easily slides out of the plate locking pin is improved, since the plate locking hole and the plate locking pin have substantially the same diameter, If it is difficult to insert the plate locking pin into the plate locking hole and if the diameter of the plate locking hole is made larger than the diameter of the plate locking pin, the publication (0028)
As described in the paragraph, it is difficult to push the printing plate further toward the clamp shaft side to release the printing plate locking hole from the printing plate locking pin. Had the drawback that it became worse.

Further, except for the special case where the plate locking pin is freely fitted by a spring, for example, a plate vise device is used as in the case of using a double-sided printing plate having images formed on both sides. When used as an original plate vise, there is a drawback that the locking pin and the like must be removed one by one. In addition, since these plate mounting devices are improved by attaching plate locking pins or the like to a plate vise provided on a conventional PS plate printing drum, the plate cylinder has a more structural structure than before. However, there is a drawback that the apparatus becomes complicated and the apparatus tends to be expensive.

[0007]

Accordingly, the first aspect of the present invention is as follows.
The object of the present invention is to provide a plate-locking device which can be easily and detachably mounted on a clamp plate of a plate vise device as required, and which is excellent in plate mounting workability and removal workability as well as safety. Is to do. A second object of the present invention is to allow a plate to be easily and securely mounted at a predetermined position on the outer peripheral surface of a plate cylinder without impairing the original function of a plate vise, and to provide a locking hole for the plate. It is an object of the present invention to provide a plate locking device that allows a used printing plate to be easily removed without breaking. A third object of the present invention is to provide a function of a plate vise, a plate can be easily and reliably attached to a predetermined position on an outer peripheral surface of a plate cylinder, and without breaking a locking hole of the plate. An object of the present invention is to provide a plate cylinder for an offset printing press having a function of easily removing a used printing plate. Further, a fourth object of the present invention is to provide an offset printing machine which has good workability for attachment and detachment regardless of the type of printing plate and is excellent in printing efficiency.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a printing plate which can be removably mounted with two or more bolts on a clamp plate of a plate vise installed on an offset printing plate cylinder. A locking device, wherein the locking device is a strip-shaped elongate upper plate, an elongate intermediate plate having a thickness of 1 to 3 mm, which overlaps with a rear portion except at least a front half of the upper plate, and A lower plate having substantially the same area as the upper plate and having the same shape is laminated in this order so as to form a gap into which a printing plate having a plurality of locking holes is inserted in the width direction near the end from the front grip side, In the gap formed between the upper plate and the lower plate, the lower surface is inclined so as to become lower toward the plate insertion slot at the front of the upper plate so as not to hinder the insertion of the plate, and the plate is formed as described above. in the gap After the plate is inserted, a plate locking pin having a head protruding rearward so as to form a recess behind so that the plate can be prevented from slipping forward and coming off is provided from the front end of the upper plate. At least 2 slightly inside
And projecting from the upper portion into the gap at a predetermined position, and between the intermediate plate and the lower plate in the vicinity of the plate locking pin, fixed to the intermediate plate and / or A thin plate spring sandwiched between the lower plates is arranged, and the thin plate spring moves upward until reaching the upper plate near the front end of the upper plate so that the inserted printing plate is pressed against the upper plate. It is folded back and stored in the gap formed by the upper plate and the lower plate, and the thin plate spring is arranged so that at least the head of the pin comes out below the bent thin plate spring. This has been achieved by a plate lock characterized by being substantially hollow.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The plate locking device of the present invention is used when winding an offset printing plate around a predetermined position on the outer peripheral surface of a printing drum. In this case, the printing plate used can be any of an aluminum plate, a plastic sheet plate, and a paper plate, but two or more printing plate locking holes that also serve as positioning are provided at both ends in the longitudinal direction in the width direction. Those having a line shape are used. In the present invention, the plate locking device of the present invention is mounted on a clamp plate of a vise device in a plate cylinder, and a plate locking pin disposed at a position corresponding to the plate locking hole is used to lock the plate. The printing plate is locked by being fitted into the hole, and then the printing plate is wound around the plate cylinder via a removable adhesive or the like and fixed. The shape of the printing plate locking hole is not particularly limited, such as a circle, an ellipse having a long axis in the longitudinal direction of the printing plate, and a shape in which the front and rear sides of a rectangle are arcs. Holes are adopted.

[0010] The plate locking device according to the present invention has three elongated plates of an upper plate, an intermediate plate and a lower plate. These longitudinal lengths are basically the same, and are less than the total length in the longitudinal direction of the clamp plate in the vise of the plate cylinder. The intermediate plate may be manufactured integrally with the upper plate or the lower plate. The thickness of the intermediate plate forms a gap through which the printing plate can be freely taken in and out.
Therefore, the thickness of the intermediate plate is naturally limited due to the ease of taking the plate in and out, and is usually 1 to 3 mm, preferably 1.5 to 2.5 mm. In order to avoid any inconvenience, it is most preferable that the distance be about 2 mm.

A plate locking pin projects from the upper plate inside the gap, and a thin plate spring for pressing the printing plate inserted into the gap against the upper plate surface is provided between the intermediate plate and the lower plate. It is fixed in between. In the present invention, a plate locking pin having a size such that the plate locking hole can be loosely fitted is used, and the plate locking pin has a lower surface so as not to hinder insertion of the plate. It is inclined so that it becomes lower toward the plate insertion slot at the front of the upper plate,
After the printing plate has been inserted into the locking hole, the head is formed rearward so as to form a recess in the rear so that the printing plate can be prevented from slipping forward (holding side of the clamp plate) and coming off. Since the plate is protruded, the plate is not obstructed by the plate locking pin even when the plate is inserted into the gap, and the plate locking pin is easily fitted into the plate locking hole to form the plate. Can be locked, and the locked printing plate is not easily detached from the printing plate locking pin.

It is necessary that at least two plate locking pins are provided on the plate locking device of the present invention. When the number of printing plate locking pins is small, when the printing plate is locked and then fixed to the plate cylinder, printing is performed on the surface of the plate cylinder to which an adhesive sheet such as a double-sided adhesive sheet is adhered. It is necessary to wind and fix the plate, but when the number of printing plate locking pins is provided as large as 10 to 15, for example, the adhesive surface is not always necessary. Sufficient fixation can be achieved simply by interposing other appropriate liquids. In addition, it is necessary to provide the printing plate locking pins with good balance in the longitudinal direction of the printing plate locking tool so that the printing plate can be locked with good balance. Further, it is easy to perforate the plate locking holes of the printing plate so as to correspond to the plate locking pins.

Next, the shape of the plate locking pin in the plate locking device of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a plan view of a plate locking pin in the plate locking device of the present invention, and FIG. 2 is a side view of the plate locking pin attached to an upper plate. In the drawing, reference numeral 1 denotes a plate locking pin, 2 denotes an upper plate, 2a denotes an upper plate surface, 11 denotes a buried portion of the plate locking pin, 12 denotes an inclined portion of the plate locking pin, and 13 denotes a plate member. Reference numeral 13a denotes a rear taper, 13b denotes a side taper, and 10 denotes a depression formed between the head of the plate locking pin and the upper plate.

As shown in FIG. 2, the plate locking pin 1 according to the present invention has a part embedded in the upper plate 2 and has an inclined part 12 and a flat part 13 on the embedded part 11. Are integrated and protrude. The rear part 13a of the flat part projects behind the pin, and
A recess 10 is formed between the recess 10a. Also, a taper is formed on the side surface 13b of the flat portion 13 of the pin, so that the printing plate (not shown) in which the printing plate locking pin is fitted is moved in the horizontal direction (the longitudinal direction of the printing plate locking device). The plate can be easily moved, and the plate can easily be removed because the plate locking pin easily comes off the plate by this movement. It should be noted that a pin having such a head can be easily manufactured with high precision by combining a rocking process and a milling process.

Further, by forming the cross-sectional shape of the pin as a rectangle and an arc as shown in FIG. 1, it is easy to adjust the position of the locked plate in the lateral direction (the longitudinal direction of the plate vise). . This is particularly true because it is possible to absorb the elongation of the paper plate that occurs when the paper plate is used, thereby preventing the paper plate from wrinkling. This is effective when using a version.

At least two printing plate locking pins as described above
The plate holding device of the present invention is manufactured by superimposing the upper plate having the plurality of plates on the lower plate via an intermediate plate having a thin plate spring corresponding to the plate holding pin fixed to the lower plate side. be able to. In this case, it is preferable from the viewpoint of operability of plate insertion that the lower plate is overlapped so that the lower plate comes forward (the plate insertion side) than the upper plate. Further, the thin plate spring is folded upward in the vicinity of the front end of the upper plate until substantially reaching the upper plate, so that the head of the plate locking pin comes out below the folded thin plate spring. At least the upper part of the thin plate spring is hollowed out.

The lower plate is preferably cut near the front end of the upper plate so that the folded tip of the thin plate spring can enter below the lower plate. As described above, since the folded end portion of the thin plate spring is positioned below the upper surface of the lower plate, a situation occurs in which the printing plate to be inserted is caught by the thin plate spring and cannot be inserted. Nothing.

A plurality of bolt holes which penetrate from the upper plate to the lower plate are provided in the plate locking device of the present invention, and the upper portion of the clamp plate in the vice device of the plate cylinder is provided so as to correspond to the holes. If the screw holes are accurately formed in the plate cylinder, the plate locking device of the present invention can be easily and accurately attached to the plate cylinder as needed. In this manner, in the plate cylinder having the plate locking device of the present invention, not only the plate locking device of the present invention can be used, but also a plate vise device can be used as in the past. .

The offset printing press having the plate cylinder to which the plate-locking device of the present invention is attached is particularly suitable for a plate having only one image side, such as a paper plate or a plastic sheet plate. With the printing plate locking device of the present invention, the printing plate can be attached and detached very easily, so that the printing efficiency is significantly improved as compared with the conventional printing press. Further, since there is no particularly protruding dangerous portion, the worker is not injured unnecessarily.

[0020]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. Example. FIG. 3 is a side view showing a state in which the lower plate is removed from the plate locking device of the present invention, and FIG. 4 is a plan view showing the vicinity of the plate locking pin with the lower plate attached. This is one example. In the drawing, reference numeral 1 denotes a plate locking pin, 2 denotes an upper plate, 3 denotes an intermediate plate, 4 denotes a lower plate, 5 denotes a thin plate spring, 6 denotes a cutting portion, and 7 denotes a bolt for attaching the thin plate spring 5 to the intermediate plate. In this figure, it penetrates to the upper plate. 8 is a bolt hole for integrating the upper plate, the intermediate plate and the lower plate with bolts, 8 'is a bolt,
This is screwed into a bolt hole provided corresponding to the clamp plate of the plate cylinder. Reference numeral 9 denotes a bolt for integrating the upper plate with the upper plate, and reference numeral 10 denotes a recess formed at the rear of the plate locking pin.

These parts can be easily and extremely accurately manufactured by using a numerically controlled processing apparatus. Similarly, the bolt holes 8 and the corresponding bolt holes provided in the clamp plate can be provided easily and precisely. Therefore, once these parts are assembled to make the plate locking device of the present invention, they can be easily and accurately attached to the plate cylinder. Positioned printing can be easily performed without any deviation.

The printing plate locking pin of the printing plate locking device according to the present invention should be able to easily perform these operations without obstructing the operation when inserting or removing the printing plate. For this reason, the surface of the flat portion 13 of the head need not necessarily be parallel to the upper plate surface 2a, and may be inclined or curved. Also, this inclination is caused by the inclined portion 1.
The inclination may be in the same direction as 2, or in the opposite direction.

The material, shape, size, and the like of the plate locking device according to the present invention are appropriately determined in consideration of strength, cost, dimensions of the printing drum, and the like. For example, a plate locking tool in which plate locking pins are provided at 550 mm intervals at symmetrical positions in the longitudinal direction with respect to all the printing plates of A may be used.
A plate having zero or more plate locking pins may be used. In the former case, it is necessary that the plate cylinder surface is an adhesive surface covered with a double-sided adhesive sheet, but in the latter case, it is possible to attach using water without using a double-sided adhesive sheet. . Further, a hole for confirming the insertion of the plate may be provided in the upper plate near the plate locking pin.

The printing plate locking pin is provided by embedding one end of the pin having the above-described shape in the upper plate.
One end of a pin of a similar shape may be passed through the upper plate and fixed by riveting on the back surface of this plate.
Further, the shape and size of the thin plate spring can be appropriately designed according to the shape and size of the plate locking pin.

[0025]

As is clear from the above description, the plate-locking device of the present invention is not only excellent in safety and workability, but also allows the plate-locking device of the present invention to be mounted in advance. If only a screw hole is provided in the clamp plate of the plate vise of the plate cylinder, the plate can be removably attached to the plate cylinder of the printing press very easily. Further, the plate cylinder having the plate locking device of the present invention allows the plate to be easily and accurately attached and detached using the plate locking device of the present invention without impairing the function of the conventional vise device. It will also be able to do things, so it will be extremely value-added. Furthermore, the offset printing press of the present invention having this plate cylinder not only requires almost no time for attaching and detaching the printing plate, but also eliminates the need to remove the printing plate locking device of the present invention. Is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a plate locking pin used in a plate locking device according to the present invention.

FIG. 2 is a side view of a plate locking pin provided on an upper plate.

FIG. 3 is an example of a side view showing a state in which a lower plate is removed from the plate locking device of the present invention.

FIG. 4 is a plan view showing an example of the plate locking device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printing plate locking pin 2 Upper plate 2a Lower plate side surface of upper plate 3 Intermediate plate 4 Lower plate 5 Thin plate spring 6 Cutting part 7 Bolt 8 Bolt hole 8 'Bolt 9 Bolt 10 Depression 11 Embedded part 12 Inclined part 13 Flat Part 13a Flat part rear part 13b Flat part side part

Claims (10)

(57) [Claims] 1. A printing plate locking device which can be detachably mounted with two or more bolts on a clamp plate of a plate vise device installed on a plate cylinder of an offset printing press,
An upper plate having an elongated shape, an intermediate plate having an elongated shape having a thickness of 1 to 3 mm, which overlaps with a rear portion except at least a front half of the upper plate, and an upper plate having substantially the same area as the upper plate; The lower plate of the shape is laminated in this order so as to form a gap into which a printing plate having a plurality of locking holes is inserted in the width direction from the front grip side to the end portion in the width direction,
In the gap formed between the upper plate and the lower plate, the lower surface is inclined so as to become lower toward the plate insertion opening at the front of the upper plate so as not to hinder the insertion of the plate, and the plate is After being inserted into the gap , a plate locking pin having a head protruding rearward so as to form a recess in the rear so as to prevent the plate from slipping forward and coming off is provided on the upper plate. At least two predetermined positions slightly inside from the front end protrude from the upper portion into the gap, and are fixed to the intermediate plate between the intermediate plate and the lower plate near the plate locking pin. And / or a thin plate spring sandwiched between the intermediate plate and the lower plate, wherein the thin plate spring has a front end of the upper plate such that the inserted printing plate can be pressed against the upper plate. In the vicinity The thin plate spring is folded back upward until reaching the part plate and is housed in the gap formed by the upper plate and the lower plate, and the thin plate spring is at least below the thin plate spring whose head of the pin is bent. A plate locking device characterized in that it is substantially hollowed out so as to be able to come out. 2. The plate locking device according to claim 1, wherein the left and right side surfaces of the plate locking pin are cut so as to form a plane. 3. A taper is provided on a side surface of the head of the plate locking pin to facilitate movement of the plate to the left or right after the plate locking pin is inserted into the locking hole of the plate. The printing plate locking device according to claim 1, wherein: 4. The printing plate locking device according to claim 1, wherein the upper plate and the intermediate plate are formed integrally. 5. The lower plate is integrated with the upper plate and the intermediate plate by bolts so that the front end of the lower plate projects from the front end of the upper plate.
The upper surface of the lower plate in the vicinity of the inside of the front end of the upper plate is shaved so as to accommodate the tip of the thin plate spring, and the spring bent portion constituting the tip of the thin plate spring has an upper surface of the lower plate. The printing plate locking device according to any one of claims 1 to 4, wherein the printing plate locking device is located in the cutting portion so as to be lower. 6. A plate-locking device according to claim 1, comprising two or more pairs of a plate-locking pin and a thin plate spring. 7. The printing plate locking pins are arranged at intervals of about 550 mm.
The printing plate locking device according to any one of claims 1 to 5, wherein the printing plate locking device is provided at a location so as to be symmetrical. 8. The plate locking device according to claim 6, wherein the plate locking pins are provided at 10 to 15 places in a well-balanced manner. 9. A plate cylinder for an offset printing press, wherein the plate-locking member according to claim 1 is provided on a clamp plate of a vise device. 10. An offset printing press comprising the plate cylinder according to claim 9.