JP2586445Y2 - Plate mounting device for printing press - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a printing press, in which one end of a printing plate is supported by a plate cylinder, and the printing cylinder is wound around the plate cylinder by rotating the plate cylinder approximately one revolution. The present invention relates to a plate mounting device for mounting a plate on a plate cylinder by supporting the other end of the plate on the plate cylinder.

[0002]

2. Description of the Related Art A notch having a substantially fan-shaped cross section over the entire length of a cylinder is provided in an outer peripheral portion of a plate cylinder of various printing presses, and a printing plate (hereinafter simply referred to as a plate) is provided in the notch. A plate vise device consisting of a grip vise that fixes the grip end of the plate, and a tail vise that grips the tail end of the plate that is then wound around the torso. Are supported by the bottom surface of the notch and extend in the axial direction of the plate cylinder.

Conventionally, the vice on the grip side and the butt side are provided with a long vise table extending in the axial direction of the plate cylinder and a pivotally supported vice table which is rotatably supported by the vice table to open and close. A plate that holds and releases the plate between the vise and
A plurality of cams are provided in parallel with each other on a rotatable cam shaft which engages with the holding plate. An elastic member such as a compression coil spring for urging the gripper plate in the opening direction is interposed between the vise table and the gripper plate.

With this configuration, when the plate is to be held, when the cam shaft is rotated, the holding plate divided into a plurality of plates in the axial direction of the plate cylinder is released from the engagement of the cam. The springs open at the same time due to the resilience of the compression coil spring.After inserting the edge of the plate between the gripper plate and the vise table, rotate the cam shaft in the opposite direction to the previous one. By the action, it rotates and closes against the elastic force of the compression coil spring, and holds the edge of the plate.

In the apparatus disclosed in Japanese Patent Application Laid-Open No. 1-127346, for example, the rear side gripping surface of the plate, which is conventionally formed in the circumferential direction of the plate cylinder, is formed in the radial direction of the plate cylinder. Thus, the vise table and the holding plate extend in the radial direction of the plate cylinder, and the end of the plate is bent at a right angle by a separately provided plate bending machine.

[0006] With such a configuration, the butt-side end of the plate, which is wrapped around the drum surface with the lip held at the grip-side end, has a bent portion between the vice table and the grip plate. The bent edge of the plate is held by rocking the holding plate with the cam mechanism.After that, the plate is evenly stretched by moving the entire back side vice in the circumferential direction. It is attached in close contact with the torso.

However, in such a printing plate mounting apparatus, the U-shaped reference pin hole provided on the plate side and the reference pin provided on the plate vise side are engaged while the opening on the side of the plate side vise is narrow. Since it is necessary to insert the plate into the part, the work is difficult and it takes a long time and a lot of labor. Therefore, it is extremely difficult to insert the plate butt bent at a substantially right angle into the opening of the vise on the butt side, and it takes much more time and the burden of labor increases.

Conventionally, a plate holding device using, for example, an openable and closable safety cover is provided on the machine side facing the peripheral surface of the plate cylinder, and a hand is attached to one end of the plate while holding the plate with the holding device. In addition to the addition of the plate-side vise, the rotation of the plate cylinder to wind the plate around the plate cylinder and the rear end of the plate by the vice-side vise are automatically performed. A semi-automatic plate mounting device has been proposed.

[0009]

In such a semi-automatic printing plate mounting apparatus, a long printing plate holding device whose both ends are supported by a swingable arm is provided in the vicinity of the drum peripheral surface. The plate presser presses the plate against the peripheral surface of the plate, winds the plate while keeping it in close contact with the peripheral surface of the plate cylinder, attaches the tail end of the plate to the grip surface of the plate vise, and attaches the plate to the plate cylinder. However, in the above-mentioned conventional semi-automatic printing plate mounting apparatus, in order to accurately mount the plate, a hand is attached to the plate and guided to be mounted on the peripheral surface of the plate cylinder. Since the gripping surface of the plate vise must be gripped, there is a possibility that a hand may be caught between the plate holding device and the peripheral surface of the plate cylinder, resulting in injury.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a printing plate mounting apparatus for a printing press which enables a printing plate to be mounted safely and easily with high precision on a plate cylinder peripheral surface. It is intended to be.

[0011]

In order to achieve the above object, according to the present invention, in a plate mounting device of a printing press, a predetermined pressure is applied to a plate holding member for pressing a plate onto a plate cylinder.
The above pressure is detected and a signal to stop the operation of the machine is issued.
A detection member is provided.

[0012]

When a foreign object or a finger is caught between the detecting member and the peripheral surface of the plate cylinder or the printing plate, or when the printing plate is not securely mounted, the detecting member detects this and issues a signal. ,
When the machine stops, the detection member and the like move away from the plate cylinder, so that the safety of the operation is maintained, the plate or the machine is prevented from being damaged, and the plate is securely mounted on the plate cylinder peripheral surface. be able to.

[0013]

1 to 7 show an embodiment of a plate mounting device for a printing press according to the present invention. FIG. 1 is a side view of a plate holding device.
FIG. 2 is a front view of the plate mounting device, FIGS. 3, 4, 5, and 6.
And FIG. 7 are side views of the plate cylinder and the plate pressing device shown for explaining the plate mounting operation, respectively.

In FIG. 1, bearings fitted to left and right frames 1 and 2 are provided with disk-shaped bearers at both ends, and plate cylinders 3 which are driven and rotated from the driving side and are rotatably supported at both end shafts. A notch 3 a having a fan-shaped cross section whose both ends are closed by bearers is provided in the outer peripheral portion over the entire length of the plate cylinder 3.

In the notch 3a, a grip-side vise 4 and a tail-side vise 5 are extended in the body axis direction. Of these, the grip-side vise 4 is provided with the notch 3a. The vise table 6 is supported on the bottom surface of the device and a holding plate 7 pivotally supported on the vise table 6 side. A cam 8 having an outer peripheral cam surface composed of an arc surface and a straight surface is provided in a groove provided on the vise 6, and the cam 8 is rotated by a driving device (not shown) to hold the cam. The plate 7 swings so that the gripping surface 7 a opens and closes with respect to the gripping surface 6 a of the vise table 6.

The vise 5 has a vise table 9 supported on the bottom surface of the notch 3a, and a holding plate 10 provided to be swingable with respect to the vise table 9 . Notch 3a
A cam 11 having an outer peripheral cam surface composed of an arc surface and a straight surface is provided in a groove provided in the wall surface of the vise. The gripper 9 swings so that the gripping surface 9 a opens and closes with respect to the gripping surface 10 a of the gripping plate 10.

On the other hand, for example, a printing plate 12 (hereinafter, referred to as a printing plate 12) shown in FIG. 4 and the like is held in a vertical state in a printing plate holding device provided by using an openable and closable safety cover (not shown). When the plate 12 is mounted on the plate cylinder 3, one end of the plate 12 is detached from the plate holding device, and the plate 12 is connected to the plate vise 4,5.

In the vicinity of the peripheral surface of the plate cylinder 3, there is provided a plate presser indicated by reference numeral 13 as a whole. The plate holding device 13 includes a bracket 15 supported inside one frame 1 via a stud 14 and the other frame 2
And a bracket 16 bolted to the inside of the pipe shaft.
Is supported.

Reference numeral 18 denotes a pipe which is rotatably fitted on the pipe shaft 17. A plate holding lever 19 and a plate holding lever 20 formed in a bifurcated shape are fixed to both ends of the pipe, respectively. A lever 21 which is driven by a driving device (not shown) to advance and retreat is pivotally attached to one end of one plate holding lever 19.

The pipe 18 has a lever 23 adjacent to the plate holding lever 19 via the spacer 22 and a lever 25 adjacent to the plate holding lever 20 via the spacer 24.
The plate press roller 26 is rotatably supported at both ends by pins 27 and 28 at the tip of the lever 23 and the tip of the lever 25, respectively. .

Further, between the pin 29 and the plate 29 protruding from the bifurcated portion of the plate holding lever 19, and the plate 30 protruding from the bifurcated portion of the plate holding lever 20.
And the pin 28 are connected to each other by rods 31 and 32 slidably engaged in the holes of the plates 29 and 30, respectively.
On the upper side, compression coil springs 33 and 34 are interposed, respectively. In this manner, the levers 23 and 25 are provided with the plate pressing roller 26 in the clockwise direction in FIG.
A rotating force in a direction of pressing against the peripheral surface of is provided.

In this apparatus, the free end of the plate press lever 19 and the free end of the plate press lever 20 are connected by a plate press bar 35, and the plate cylinder of the plate press bar 35 is connected. A switch 36 that emits a signal by pressing the end face side is attached to the end face on the side facing the peripheral surface over the entire length of the plate holding lever. In the case of the present embodiment, the switch 36 has a pair of conductors embedded in an insulator. When a pressure equal to or higher than a predetermined pressure is generated at an arbitrary position of the switch 36, the conductors come into contact with each other. It is configured to stop the operation by issuing a signal.

The plate exchange operation by the printing plate mounting apparatus configured as described above will be described with reference to the operation explanatory diagrams of FIGS. The safety cover is closed during printing,
The front side of the printing unit is covered, and the plate 12 to be mounted is supported by a plate receiver (not shown) provided on the safety cover.

When the plate is to be replaced from this state after the printing operation, when the drive device is operated, the safety cover is raised and opened while holding the plate 12, and the front of the plate cylinder 3 is opened. . In this state, as shown in FIG. 3, after the holding plate 9 of the vice side vise 5 is opened to release the holding of the plate 12, the plate cylinder 3 is moved from the state of FIG. 3 to the state of FIG. Then, the gripper 7 of the gripper-side vise 4 is opened to release the grip of the plate 12.

At this time, the entire plate holding device 13 rotates clockwise around the pipe shaft 17 from the position shown in FIG. 3 to the position shown in FIG.
While the plate cylinder 3 is rotated in the clockwise direction from the position shown in FIG. 4 to the position shown in FIG. 5 while the plate 12 is pressed by the elastic force of 34, the plate 12 is discharged as shown in FIG. The plate holding device 13 is rotated counterclockwise to the position shown in FIG.

Therefore, the new version 1 held by the safety cover 1
When the gripper 7 is closed and the gripper plate 7 is closed, the plate 12 is gripped. When one end of the plate 12 is held in this way, the plate pressing device 13 rotates counterclockwise from the position shown in FIG. 5 to the position shown in FIG. 6, and the plate pressing roller 26 is pressed against the plate 12.

The rotation of the plate cylinder 3 causes the plate 12 to be wound around the peripheral surface of the plate cylinder 3, but the plate 12 is pressed against the plate pressing roller 26, so that it comes into close contact with the peripheral surface of the cylinder. When the plate cylinder 3 rotates counterclockwise from the state shown in FIG. 6 to the state shown in FIG. 7 and stops, the plate holding device 13 rotates to the position shown in FIG. The press roller 26 and the switch 36 are inserted into the holding surface of the rear side vice 5 and the vise stand 9 of the rear side vice 5 is closed to hold the plate bottom. Then, the work of mounting the plate 12 is completed.

In the operation for mounting the printing plate 12, the switch 36 attached to the printing plate holding bar 35 is provided with a switch shown in FIG.
In this state, a uniform pressure is applied to the entire length of the switch 36, so that the pressure becomes lower than the set pressure of the switch 36, and the switch 36 does not operate. Further, since the surface of the switch 36 is formed of an elastic member such as rubber, the plate 12 is not damaged.

In the state shown in FIGS. 4, 6, and 7, when foreign matter is caught between the peripheral surface of the plate cylinder 3 and the switch 36, pressure concentrates only on a part of the switch 36 in the longitudinal direction. As a result, the contact of the switch 36 is closed, a signal is issued to stop the machine, and the plate holding device 13 is withdrawn from the plate cylinder 3, so that the safety of operation is maintained.

If the bent portion of the printing plate 12 is not correctly bent at least in part, the printing plate 12 is not inserted between the gripping surfaces 9a and 10a. When the switch 35 is operated, an abnormal pressure exceeding the predetermined pressure is generated in the switch 36. Therefore, the contact of the switch 36 is closed, a signal is issued, the machine is stopped, and the plate holding device 13 is withdrawn from the plate cylinder 3. Therefore, the printing operation is not started in an incompletely mounted state of the plate, and damage to the printing press caused by the incompletely mounted state of the printing press can be avoided.

In this embodiment, the switch 36 is exemplified as a detecting member for detecting an abnormal pressure equal to or higher than a predetermined pressure. However, the present invention is not limited to this. For example, a conductive rubber using a piezoelectric element may be used. Further, these detecting members may be provided on the surface of the plate pressing roller 26. These detecting members need not be long as in the embodiment, and a plurality of short members may be provided in parallel. Further, the present embodiment shows an example in which the present invention is applied to a sheet-fed printing press. However, the present invention can also be applied to a paper roll printing press, and the same operation and effect can be obtained.

[0032]

As is apparent from the above description, according to the present invention, in the plate mounting device of the printing press, the plate holding member for pressing the plate against the plate cylinder is applied with a pressure higher than a predetermined pressure.
By providing a detection member that detects the force and outputs a signal to stop the operation of the machine, it detects when a human hand or foreign matter is caught between the detection member and the peripheral surface of the plate cylinder or the printing plate. The member detects this and issues a signal, and the machine stops,
As well as improving safety, the printing plate is not damaged,
The durability of the printing plate is improved. Further, when normal pressure is not applied to the bottom of the plate, this can be detected, so that safety is further improved.

In addition, when the plate holding device is operated in a state in which the rear end of the plate is not inserted into the gripping surface due to the incorrect bending of the rear side bent portion of the printing plate, a predetermined pressure is applied to the detecting member. The above abnormal pressure acts, the detection member emits a signal, the machine stops, and the plate holding device moves away from the plate cylinder. The breakage is avoided and safety is improved.

[Brief description of the drawings]

FIG. 1 is a side view of a plate holding device.

FIG. 2 is a front view of the plate mounting device.

FIG. 3 is a side view of a plate cylinder and a plate pressing device shown for explaining a plate mounting operation.

FIG. 4 is a side view of a plate cylinder and a plate pressing device shown for explaining a plate mounting operation.

FIG. 5 is a side view of a plate cylinder and a plate pressing device shown for explaining a plate mounting operation.

FIG. 6 is a side view of a plate cylinder and a plate pressing device shown for explaining a plate mounting operation.

FIG. 7 is a side view of a plate cylinder and a plate pressing device shown for explaining a plate mounting operation.

[Explanation of symbols]

 3 Plate cylinder 12 Printing plate 13 Plate holding device 26 Plate holding roller 36 Switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B41F 27/12 B41F 33/00 B41F 33/14 B65H 1/00

Claims (1)

(57) [Scope of request for utility model registration] A plate holding member for pressing a printing plate against a plate cylinder is provided with a pre- pressed member.
The pressure of the set pressure is detected and the operation of the machine is stopped.
A printing plate mounting device for a printing press, comprising a detection member that emits a signal to stop the printing plate.