JPH03286864A - Printing plate replacing apparatus of printing press - Google Patents

Abstract

PURPOSE:To achieve labor saving by automating the replacing work of an old plate and a new plate by supporting a printing plate holding member on the side of a machine stand in a freely shakable and vertically movable manner so as that the leading end thereof moves from the operation position close to a plate lock-up device to a housing position spaced apart from the plate lock-up device. CONSTITUTION:When the piston rod 13 of an air cylinder 12 advances and recedes, a loader 10 is shaken between the suspended posture in a housing state shown by a numeral 10B and the tilted posture in an operative state shown by a numeral 10A through levers 14, 15 and the leading end part thereof moves in the direction getting away from and coming up to the peripheral surface of a plate cylinder 3. An old plate holding apparatus is provided in a loader 10 and the loader 10 is brought to an inclined posture to perform the opening and closing of both plate lock-up devices and the revolution of the plate cylinder 3 and the used old plate discharged from the plate cylinder 3 advances into the loader 10 to be held therein. Further, a plate supply device is provided in the loader 10A and the new plate held in the loader 10A is mounted on the plate cylinder 3 in the order almost reverse to that at the discharge time of the old plate.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applied to a printing press in which an old plate held in a plate vise and mounted on the peripheral surface of a plate cylinder is replaced with a new plate prepared outside the machine. This relates to a plate changing device.

(Prior art) A notch extending the entire length of the cylinder is provided on the outer periphery of the plate cylinder of a printing press. A grip side vise that holds the part in its mouth,
A printing plate fixing device consisting of a bottom side plate vise which grips the bottom side end of the plate which is then wrapped around the cylinder circumferential surface.
It is fixed to the bottom of the notch and extends in the axial direction of the barrel.

In the past, these ηetl! ! 1. The plate vise on the rear side consists of a long vise base extending in the direction of the axis of the body, and a plurality of bolts attached to the edge of this vise base so that the vise can swing freely, opening and closing the vise. A plurality of gripping plates for gripping and releasing the plate between the force table and a plurality of cams that engage with the edge notches of each of these gripping plates are biased. are fixed in parallel on a rotatable camshaft. Further, a plurality of compression coils for biasing the grip plate in the opening direction are interposed between the vice stand and the grip plate.

With this structure, when holding the plate, when the camshaft is rotated, the gripping plate, which is divided into multiple pieces in the lengthwise direction of the body, is released from the cam's hold and acts as a compression coil spring. They open all at once due to the elastic force of the gripping plate, so after inserting the edge of the plate between the gripping plate and the vise stand, when the camshaft is rotated in the opposite direction, the gripping plate is compressed by the action of the cam. Closes positively against the elastic force of the coil spring,
Hold the edge of the plate in your mouth.

[Problem to be solved by the invention]

However, in such conventional plate vise devices, the camshaft must be manually rotated to open and close the plate gripping surface as described above, which increases man-hours and degrades work efficiency. There is a problem in that not only a great deal of labor is required, but also preparation time is extended, resulting in a decrease in productivity.

Therefore, the present applicant installed a plate holding member holding a new plate between the units of the printing press, discharged the old plate removed from the plate cylinder into this plate holding member and held it, and held the new plate instead. We have developed and proposed a plate changing device that discharges the plate from the member and attaches it to the plate cylinder, but in this case, when the plate holding device is in the retracted state, the lower half of the plate changing device connects to the water supply device of the printing unit. Because it occupies a covering position, this plate holding member gets in the way when performing maintenance and inspection of the water supply device or replenishing dampening water into the water tank, making work difficult and extremely dangerous. .

[Means to solve the problem]

In order to solve the second problem, the present invention provides a mechanism in which the plate holding member is moved between an operating position in which the tip thereof is close to the plate vise and a storage position in which it is separated from the plate vise. It is supported by the platform so that it can swing freely and move up and down.

[For production]

When replacing the plate, rotate the plate holding member (hereinafter referred to as the loader) so that its tip faces the plate vise, and
During the printing operation, the loader is placed in a retracted state by hanging it so that its leading end is separated from the plate vise. In the case of maintenance and inspection of the water supply device, supply of dampening water, etc., when the stored loader is raised, the work surface of the water supply device is opened, making the work easier.

〔Example〕

1 to 5 show an embodiment of the printing plate changing device according to the present invention, FIG. 1 is a front view thereof, FIG. 2 is an enlarged plan view of FIG. 1, and FIG. FIG. 4 is a partially cutaway side view of FIG. 1, and FIG. 5 is a front view of the plate changing device shown in a state where the plate holding member is raised. In addition, the side of the printing plate changing device excluding the support structure of the printing plate holding member, or the printing plate of a sheet-fed printing press proposed by the present applicant and disclosed in Japanese Patent Application No. 1-337378. Since it has the same configuration as the exchange device, detailed explanation thereof will be omitted.

In the diagram, print! ! 1 has a paper feeding unit having a paper stacking table for stacking paper and a paper feeding device for sending out paper one by one, a printing unit 2 of 4&l, and a paper stacking table for stacking printed matter printed by the printing unit, t. Each printing unit 2 includes a plate cylinder 3. A printing cylinder such as a blanket cylinder 4, an inking device (not shown), and a water boat 5. A water supply device 7 consisting of a group of rollers 6 is provided. In the outer circumferential notch of the plate cylinder 3, there is a grip side plate vise that holds one end of the printing plate (hereinafter referred to as the plate) and a bottom side plate vise that holds the other end of the plate vise. The plate is attached to the body circumferential surface by holding one end in the grip side plate vise and wrapping it around the body circumference, and then holding the other end in the butt mail order vise. It is configured to

The plate vise and its opening/closing device are attached with a plate changing device for exchanging a used old plate with a new plate to be used from now on. That is, a frame (not shown) is provided on the upper end surface of the frame 8 provided in each printing unit 2 for the 2nd, 3rd, and 74th colors, and a frame (not shown) provided at the starting end of the paper ejection device with a space between the frame and the frame of the 4th color printing unit. ) A pair of left and right brackets 9 formed in a rectangular shape are fixed to the upper end surface of the plate cylinder 3, and are positioned obliquely above the plate cylinder 3. A formed bearing groove 9a is provided. In this bearing groove 93, a loader lO as a plate holding member, which is formed in an oblong rectangular shape with the same length as the plate cylinder 3 when viewed from the front, is attached to a roller 11 formed of a rolling bearing provided at the base end. are fitted in a rotatable and removable manner in the vertical direction so that they can swing freely.

On the other hand, an air cylinder 12 connected to a control device is pivotably supported in the left and right frames 8 (hereinafter, the frame provided at the starting end of the sheet discharging device is also included) in close proximity to the bracket 9. A lever 14 pivotally attached to the frame 8 side and a lever 15 pivotally attached to the loader 10 side are pivotally attached to the working end of the piston rond 13.

By doing this, when the piston front 13 of the air cylinder 12 advances or retreats, the loader 10 swings via the lever 14.15, and the loader 10 swings between the hanging position in the retracted state shown at 10 in the figure and the operating state shown at 10A in the figure. It is configured to swing between the tilting posture and the tip portion to move in a direction toward and away from the circumferential surface of the plate cylinder 3.

An old version holding device is provided in the loader 10, and the loader 10 is designated by the symbol ! By opening and closing the reprint vise and rotating the plate cylinder 3 in the inclined position shown by OA, the used old plate discharged from the plate cylinder 3 enters the loader IOA and is held there. It is configured. Additionally, the loader IOA
A plate feeding device is installed inside, and a roughening rotor I is installed.
The new plate held in the OA is loaded onto the plate cylinder 3 in the reverse order from when the plate is ejected.

This device has a water supply device 7 by raising the loader lO.
A device is provided for opening the working surface of the machine. That is,
The left and right frames 8 of each printing unit 2 are provided with gas springs 16 as spring members having a long expansion and contraction stroke.
However, the bracket 1 fixed near the upper end of the water supply device 7
The upper end of this gas spring 16 is connected to the loader lO through an L-shaped fitting 18.
It is pivoted to. By doing this, the loader 10
is biased upward by this gas spring 16 so that the state shown in FIG. has been done.

Reference numeral 19 denotes a stop lever rotatably attached to the upper end surface of the bracket 9, and is configured to be rotated as shown by solid lines and chain lines in FIG. By rotating the stop lever 19 to the solid line position while pushing it down against the elastic force of the gas spring 16, the loader 10 is prevented from rising.

Reference numeral 20 denotes a guide roller which is rotatably fitted to the tip of the bottle 21 protruding from the bracket 9 and is attached to the loader 10 to guide its up and down. This is a guide that guides you up and down. At the loader 10 side pivot part of the Reno\-I5,
A bearing 23 shown in FIG. 4 is fixed, and this bearing 23
An L-shaped pin 25, which is biased toward the lever 15N by a compression coil line 24, is pivotally supported inside the bottle 2.
The distal end of the lever 5 is inserted into the bottle hole of the lever 15 so as to be freely inserted and removed. By doing this, when the pin 25 is pulled out from the bottle hole of the lever 15 against the elastic force of the compression coil spring 24,
The loader 10 is configured to be able to rise. Further, near the rollers 11 of the rodder 10 in the retracted state, a Mitsutwitch 26 connected to the control device or supported by the bracket 9 is provided, so that the machine is operated only when the loader 10 is lowered. It is configured so that it is possible.

The operation of the plate changing device configured as above will be explained. During the printing operation, the loader 10 is shown at 10A and 10 in the figure.
As shown in B, rollers 11 are attached to the bearing rL9a of the bracket 9.
The loader 10 is fitted and stored in a hanging position, and the loader 10 is prevented from rising by a stop lever 19.

When the old plate is replaced with a new one after the printing process is finished, when the start button is pressed, the air cylinder 12 is actuated and the loader 10 is moved through the lever 14.15, as shown by the symbol lOA in FIG. tilts to the plate exchange position. Further, the servo motor rotates and the plate cylinder 3 moves by a predetermined angle until the plate cylinder 3 occupies the plate discharge position.

At this time, when the left and right air cylinders operate simultaneously, the plate gripping surface of the butt side plate vise opens, and at the same time, the plate grip of the grip side plate vise 5 also opens, and the plate released from the grips is transferred to the plate ji13. Due to the rotation and the operation of the haiku printing device in the rotor IOA, it is discharged and stored in the loader IOA. Next, the new plate held in the staking loader 10A is loaded onto the plate cylinder 3 by rotating the plate cylinder, opening and closing the plate vise, and operating the plate feeding device in the loader IOA. After the plate is replaced, the loader 10A is placed in a hanging state, and then the operator enters the space between the units, removes the old plate in the loader 10, and holds the next new plate in the loader IO.

When performing maintenance inspection on the water supply bag M7 or supplying dampening water into the water boat 5, pull the pin 25 in the direction of the arrow in FIG. 4 to disengage the lever 15 and the loader 10. Thereafter, when the stop lever 19 is rotated to the chain line position in FIG. 2, the loader 10 is released from the stop lever 19, and the guide roller 2
0 and the guide 22, it rises to the position shown in FIG. As a result, the working surface of the water supply device 7 is completely opened.

In this embodiment, a plate holding member that holds an old plate vise and a new plate is shown as an example, but it is also possible to hold either the new plate or the old plate. Further, it is not necessary to provide a spring member for raising the plate holding member and a regulating member for regulating the rise of the plate holding member at the lower limit position.

〔Effect of the invention〕

As is clear from the above description, in the plate changing device of a printing press according to the present invention, the plate holding member can be placed in two positions: an operating position where the tip end is close to the plate vise, and a storage position where the tip is separated from the plate vise. By supporting the machine so that it can swing freely and move up and down, the work of exchanging old and new plates can be easily automated, saving labor and reducing preparation time. In addition to improving productivity, the plate holding member is raised to completely open the working surface of the water supply system, making maintenance and inspection of the water supply system, pouring water into water canoes, replacing rollers, etc. extremely easy. It is easy to perform and improves work efficiency and safety.

[Brief explanation of drawings]

1 to 5 show an embodiment of the printing plate changing device according to the present invention, FIG. 1 is a normal WJ diagram thereof, and FIG. 2 is a
Figure 3 is an enlarged plan view of Figure 1, and Figure 4 is an enlarged side view of Figure 1.
The figure is a partially cutaway enlarged side view of FIG. 1, and FIG. 5 shows the plate holding member in an elevated state at plate crossing t1! ! FIG. 3 is a front view of the device.

Claims (1)

[Claims] The plate holding member is supported so as to be swingable and vertically movable on the machine base so that the tip can move between an operating position where the tip is close to the plate vise of the printing press and a storage position where it is away from the plate vise. A printing plate changing device for a printing press, characterized in that: