JP2832570B2 - Plate mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed printing press,
In particular, the present invention relates to a device that assists in mounting a flexible printing plate on a plate cylinder of a printing unit.

[0002]

BACKGROUND OF THE INVENTION In sheet-fed printing presses, it is desired that the plate changing operation be performed as quickly as possible, or preferably automated, in order to reduce the so-called preparation time as much as possible. To mount the printing plate, first open the protective cover covering the printing unit, make the gripper provided in the groove of the plate cylinder grip the plate tip of the plate, and then rotate the plate cylinder. By moving the printing plate, the printing plate is gradually wound on the outer periphery of the plate cylinder, and finally, the plate tail is also held by the clamping device on the side of the groove, and an appropriate tensile force is applied.
Therefore, in order to speed up the plate changing operation, it is necessary to precisely improve a device that supports these series of operations.

[0003]

A reference pin or a reference surface serving as a reference for mounting a printing plate is prepared in a holding device on a holding side of a plate cylinder, and a plate tip is pressed against these reference pins or the like. Registered and then clamped. In the past, the plate tip was only pressed against the reference pin or the like by its own weight of the printing plate, so when the plate tip was added by the bite-side clamp device, the plate tip suddenly moved slightly. It cannot be added in a certain state, and as a result, a problem such as poor registration of the printing plate has been caused.

[0004] The present invention has been made in view of the above problems,
It provides an advanced printing plate mounting device whose purpose is
An object of the present invention is to provide a flexible printing plate with a sled to generate a positive contact force against a reference pin or the like.

[0005]

For this purpose, a printing plate mounting apparatus according to the present invention comprises a pair of cover arms (9) for suspending a protective cover (8) covering a printing unit.
And laterally disposed consolidate the shaft (13) at the lower end, the plate and (2) a stopper member (14) a shaft (13) to press the plate rear one
It is characterized by being fixedly arranged on the body .

[0006]

When the printing plate is replaced, the bottom of the printing plate (2) is put on the stopper member (14) to warp the flexible printing plate (2). By generating an appropriate contact force, accurate and stable registration can be realized.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side view of a printing unit provided with a plate mounting device according to the present invention, FIG. 2 is a front view from the right in FIG. 1, and FIG. 3 is a perspective view of the plate mounting device according to the present invention. FIG. 4 is a schematic side view of the printing unit in a state where the apparatus of the present invention is not operated, and FIG. 5 is a perspective explanatory view of the apparatus of the present invention in a state where the apparatus is not operated.

In FIG. 1, a set of printing units of a sheet-fed printing press is schematically illustrated, and reference numeral (1) indicates a plate cylinder around which a flexible printing plate (2) is wound. . A blanket cylinder (3) whose outer periphery is covered with a blanket is in contact with the plate cylinder (1), and an impression cylinder (4) for printing and pressing the paper is in contact with the blanket cylinder (3). . As is well known, an inking device and a dampening device are attached to the plate cylinder (1), but these are not shown.

A plate cylinder (1) around which a printing plate (2) is wound
A part of the outer periphery is cut out to form a groove (5),
In the groove (5), a gripper (6) for holding the plate tip and a clamper (7) for gripping the plate edge are paired to form a pair in the body axis direction (in the direction perpendicular to FIG. 1). ).

At the time of plate replacement, a reference pin or a reference surface (both not shown, for example, which is well-known, is provided on a clamp base of the gripper-side clamp device 6). ) Is pressed against the plate tip of the printing plate (2), which is used as a registration reference, and then is actually clamped. The device of the present invention does not press against a reference pin or the like solely by the weight of the printing plate (2) as in the prior art, but generates a warp on the flexible printing plate (2), By using the contact force, the plate tip is strongly pressed against a reference pin or the like to achieve accurate and stable registration.

It is well known that a protective cover (8) is hung on a printing unit by a pair of cover arms (9) so as to be openable and closable in order to secure the safety of both the printing unit and the operator. It is on the street. That is, a protective cover (8) made of a net-like plate is suspended by a cover arm (9) attached to a side frame (10), and the cover arm (9) is connected to a cylinder means (11) and a link mechanism (12). Is activated to open and close the protective cover (8).

The present invention relates to such a cover arm (9).
2 and 3, one shaft (13) is horizontally provided at the lower ends of the pair of cover arms (9) as shown in FIGS.
A stopper member (14) which solidifies and temporarily fixes and presses the plate edge of the printing plate (2) is fixedly disposed integrally with the shaft (13) . The stopper member (14) has a very simple shape having only a portion for temporarily fixing the bottom of the plate,
It is inserted and fixed at an appropriate position of the shaft (13),
In addition, the end of this shaft (13) is also fixedly connected to the lower end of the cover arm (9). Therefore, as shown in FIG. 4 and FIG. 5, when the printing plate (2) is not replaced, and when not operating, the stopper member (14) integrated with the opening / closing operation of the cover arm (9 ) is moved. It is flush with the protective cover (8) and is completely hidden, so there is no danger of hindering the work of the operator. In addition, the code (1
5) shows a guide roller provided in the middle of the protective cover (8).

[0013]

According to the apparatus of the present invention, a positive contact force based on the warpage of a flexible printing plate can be generated, so that accurate and stable registration can be realized. This can greatly contribute to speeding up plate exchange work.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a printing unit provided with a plate mounting device according to the present invention.

FIG. 2 is a front view from the right in FIG.

FIG. 3 is a perspective view of a plate mounting device according to the present invention.

FIG. 4 is a schematic side view of the printing unit in a state where the apparatus of the present invention is not operated.

FIG. 5 is a perspective explanatory view of the device of the present invention in a non-operating state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 plate cylinder 2 printing plate 5 groove 6 gripper side clamp device 7 gripper side clamp device 8 protective cover 9 cover arm 11 cylinder means 13 shaft 14 stopper member

Claims (1)

(57) [Claims] 1. A with laterally disposed consolidate the shaft (13) at the lower end of the cover arm pair for hanging the protective cover that covers the printing unit (8) (9), plate the plate rear (2) Push stopper member (14) is fixed integrally with shaft (13).
Plate mounting apparatus characterized by the constant provided.