JPH0359827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a plate bending device for bending the vicinity of a plate vise insertion portion of a printing plate mounted on a plate cylinder of a sheet-fed rotary printing press.

[Prior art]

When installing a printing plate on the plate cylinder of a sheet-fed rotary printing press, align the reference hole on the grip side of the plate with the reference hole provided in the vise on the grip side of the plate cylinder, and insert it here. After inserting the reference pin and wrapping this printing plate around the circumference of the plate cylinder, push the bottom end of the printing plate into the gap between the vise base of the bottom plate vise and the presser plate, and press the presser plate. A commonly used method is to fix the door by closing it. As a result of installing the printing plate in this way, if the printing plate is not in close contact with the circumferential surface of the plate cylinder, the ink roller and wet roller that are in contact with the plate cylinder may vibrate or the printing register may be misaligned. Even if you insert the end of the printing plate into the gap in the plate vise on the bottom side and then tighten it,
It is necessary to bring the printing plate into close contact with the circumferential surface of the cylinder as much as possible during insertion.

However, in order to hold the printing plate wrapped around the cylinder circumferential surface in the plate vise, the plate vise is installed at a lower position in the notch around the cylinder. It is extremely difficult to bend a printing plate, which has considerable elasticity even though it is soft, and to hold it tightly against the circumferential surface of the cylinder in the vise, and requires a great deal of effort and skill. Currently, printing plates are not installed satisfactorily. In this case, it is also possible to modify the independent plate bending machine used in web-fed rotary printing presses and use it for sheet-fed rotary printing presses; Since it is bent after being positioned and fixed, it requires a large installation area, and positioning, etc., is troublesome and takes a long time.

[Summary of the invention]

The present invention has been made in view of the above points,
A pair of upper and lower horizontal shafts and a plate bending bar are supported inside the frame of the plate punching device, sandwiching the plate inserted through the opening of the frame, and when the tip of the inserted plate comes into contact, a contact point is formed. By activating a fluid cylinder through a switch that closes and bending the printing plate by pressing it against the upper and lower horizontal axes with a plate bending bar, it is possible to improve the workability of mounting the printing plate on the plate cylinder and to improve the workability of mounting the printing plate on the cylinder circumferential surface. To provide a plate bending device that enables plate bending to improve the adhesion of a printing plate to a printing plate, following a printing plate perforation step, with an extremely simple operation. Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

1 to 7 show an embodiment of a plate bending device according to the present invention, FIG. 1 is a plan view of a perforated and bent printing plate, and FIG. 2 is a plan view of a printing plate perforation device according to the present invention. 3 is a side view, FIG. 4 is a side sectional view and front view of the positioning and fixing member for the holding side of the printing plate, FIG. 5 is a side view of the perforator for the bottom reference hole, and FIG.
The figure is a plan view of the main part of the plate bending device, and Figure 7 is the same as Figure 6.
It is an AA sectional view. In the figure, the number 1 indicates a printing plate that has undergone plate making, perforation, and plate bending before being attached to the plate cylinder.It is formed into a rectangular shape from a thin aluminum plate, and the lower edge of the figure is attached to the plate cylinder. Since this is the side that holds the printing paper in its mouth and leads when it is attached, this is called the holding side edge 1a, and the upper edge in the figure is called the butt side edge 1b. 2 is a pattern formed by plate making, 3 and 4 are reference holes for plate making, which will be described later, and 5, 6, and 7 are reference holes for mounting the plate cylinder, which will be described later. In this example, the reference holes are inserted after plate making. 5, 6, 7
The figure shows an example of a device for perforating a hole.

The printing plate perforation device 10 includes a box-shaped pedestal 11 installed on the floor. A plate 12 is supported by a pedestal 11 and a stay 13 projecting obliquely upward from the pedestal 11, and is erected at a slight incline. On the lower end surface of the plate 12,
A support angle 14 having approximately the same length as this is fixed, and a pair of left and right plate holders 15 are fixed to the front surface thereof, each having a groove 15a opening upward for inserting the printing plate 1. is set so that its rear surface is flush with the surface of the plate 12. Inside each of the left and right plate holders 15, L-shaped bearings 16 are adjacently fixed with bolts, and these bearings 16 have a handle 1 in the center.
7 is integrally formed with a shaft 18 that is rotatably supported. Reference numeral 19 denotes a pair of left and right disks having a hole 19a formed in an eccentric portion formed in a disk shape and fixed to both ends of the shaft 18.
There is a U-shaped groove 1 on the outer periphery with a phase difference of approximately 180°.
9b are provided in the same phase on the left and right sides, and a half-moon-shaped cut groove 19c is provided at this location.
A large diameter portion of a positioning pin 20 formed in a step shape is engaged in the cut groove 19c, and a dowel pin 21 that is fixed through the large diameter portion is engaged in the U-shaped groove 19b. The small diameter portion of the positioning pin 20 is slidably inserted into a pin hole 15b bored across the groove 15a of the plate holder 15.
By gripping the handle 17 and rotating the shaft 18, the small diameter portion is inserted into the pin hole 15b through the disc 19.
It is configured to move forward and backward within the space. On the other hand, printing plate 1
The oval-shaped reference hole 3 and the perfect circular reference hole 4 provided in
These reference holes 3 and 4 are drilled in the vicinity of the edge 1a on the mouth side where there is no pattern 2, prior to the plate-making process.
A reference pin of a plate-making printing device is inserted into the plate-making printing device, and the pattern 2 of each color printing plate 1 is printed. The printing plate 1 that has been printed in this way is placed on the plate 12, and the grip side edge 1a is inserted into the groove 15a of the plate holder 15.
The small diameter portion of the positioning pin 20 is inserted into the reference holes 3 and 4.

A pair of left and right elongated holes 22 are bored near the upper end of the plate 12, and each elongated hole 22 has a positioning mechanism for positioning the printing plate 1 laterally by bringing the left and right edges of the printing plate 1 into contact with each other. A gauge 23 is formed and fixed to the edge of the printing plate 1 so as to be freely adjustable forward and backward.

A stand 24 having a U-shaped cross section is fixed to the center of the upper end of the back surface of the plate 12, and an L-shaped bracket 26 fixed to the upper surface of the stand 24 with a bolt 25 serves as a fluid cylinder connected to an air source. An air cylinder 27 is supported via an angle 28. A support plate 31 of the butt-side perforator, generally designated by the reference numeral 30, is fixed to the piston rod 29 of the air cylinder 27.
As the bracket 9 moves back and forth, it is guided by a groove 12a provided at the upper end of the plate 12, and is raised and lowered while slidingly contacting the front surface of the bracket 26. In addition, the support plate 31
An engaging groove 31a for the printing plate 1 is provided at the lower end of the plate 1, and by lowering the support plate 31 using the air cylinder 27, the plate 1 is inserted into the upper end of the printing plate 1 supported by the plate receiver 15. The groove 31a is configured to fit therein. The protruding piece 31b of the support plate 31 has
A lever 32 is slidably pivoted by a stud 33, and its upper free end is connected to a piston rod 35 of an air cylinder 34 fixed to a support plate 31.
It is pivoted to. Further, a cutting die 36 is pivotally attached to the lower free end of the lever 32 and moves forward and backward within the cutting hole 31c of the support plate 31 by the swinging of the lever 32. This cutting die 36 is used to make the reference hole 5 in the printing plate 1 by advancing and retreating, and its shape is a U-shape that opens toward the bottom edge 1b of the printing plate 1, as shown in FIG. It is formed in the shape of Furthermore, mount 1
A foot switch 37, which is electrically connected to a compressor (not shown) that supplies air to the air cylinders 27, 34, is provided at the lower end of the air cylinder 1, respectively.
38 are arranged in parallel. And foot switch 3
7, the piston rod 29 of the air cylinder 27 expands via the compressor and the perforator 30 rises, and when the foot switch 37 is released,
The piston rod 29 is configured to retract and the perforator 30 is lowered. Also, by stepping on the foot switch 38, the piston rod 35 of the air cylinder 34 is compressed via a compressor (not shown).
expands and the cutting die 36 makes the plate hole 31c for drilling.
When the foot switch 38 is released, the piston rod 35 contracts, and the punching die 36 completes the perforation and comes out of the printing plate 1. 39 is a cover of the perforator 30.

Furthermore, at the lower end of the plate 12, there is provided a reference numeral 4 in FIG.
A pair of left and right perforators indicated by 0 and 41 are provided. These perforators 40 and 41 have the same perforation structure as the perforator 30 upside down, including the air cylinder 34, lever 32, cutting die 36, etc.; It is fixed to the side, and a lifting mechanism using the air cylinder 27 is not provided. These perforators 4
0 and 41 are the reference holes 6 and 7 on the mouth side, respectively, and the shape of the reference hole 6 is a U-shape that opens toward the edge 1a on the mouth side, and the reference hole 7 is
The shape is a U-shape that opens to the edge 1a on the side of the mouth. Therefore, the shape of the cutting die of the perforators 40 and 41 is also the same as that of the reference holes 6 and 7. and perforator 4
0 and 41 are connected in parallel with the perforator 30 to a compressor that is electrically connected to a foot switch 38, and the perforators 30, 40, 41 are configured to perform a perforating operation at any time when the foot switch 38 is operated. There is.

Next, a plate bending device, generally indicated by reference numeral 42, will be explained. A hole 43 that is slightly longer than the width of the printing plate 1 is provided in the side plate 11a on the working side of the pedestal 11.
guide plates 44, 45 that are inclined toward the bottom plate 11b of the
is provided. By inserting the printing plate 1 into the hole 43, it is configured to slide toward the bottom plate 11b under its own weight along guide plates 44, 45, and the leading edge of the inserted printing plate 1 is in the direction of movement. A bracket 47 fixed to the bottom plate 11b has a limit switch 46 whose contacts close when it comes into contact with the bracket 47.
It is supported and installed. On one side sandwiching the insertion plate 1, a pair of upper and lower horizontal shafts 48, 49 parallel to the surface of the plate 1 are supported between left and right spring receivers 50 fixed to the inner surface of the side plate of the trestle. Further, on the other side sandwiching the inserted printing plate 1, a plate bending bar 51 is slidably supported at both ends in the elongated hole 50a of a spring receiver 50, and has upper and lower horizontal shafts 48, 49.
It is provided so that it can freely move forward and backward in the direction of distance from and near the line connecting the axes of. A compression coil spring 52 is installed between the left and right spring receivers 50 and both ends of the plate bending bar 51, and its elastic force causes the plate bending bar 51 to
are urged away from the horizontal shafts 48, 49. The stay 53, which has an L-shaped cross section and is integrally formed with the left and right spring receivers 50 and supported between the left and right side plates of the pedestal 11, is supplied with air from an air compressor (not shown) electrically connected to the limit switch 46. An air cylinder 55 is installed to move the piston rod 54 forward and backward, and when the piston rod 54 is extended by air pressure, a plate bending bar 51 that engages with its working end moves up and down against the elastic force of a compression coil spring 52. It moves toward the horizontal shafts 48, 49, and is configured to bend the printing plate 1 into a dogleg shape due to the positional relationship of the three shafts 48, 49, 51.

The operations of the plate punching device and plate bending device configured as described above will be explained. First, foot switch 3
When you step on 7, the air cylinder 27 is activated via the compressor.
The piston rod 29 is extended, and the perforator 30 is guided by the engagement groove 12a and the sliding surface of the bracket 26 and rises. On the other hand, reference holes 3 and 4 are bored in the printing plate 1 using a separate punching device.
Pattern 2 is printed based on pattern 4. Therefore, such a plate 1 that has already been made is placed on the plate 12, and its lower end is inserted into the groove 15a of the left and right plate receivers 15, and then the left and right positioning gauges 23 are inserted along the long holes 22. When the printing plate 1 is moved and centered, the positioning pin 20 and the reference holes 3 and 4 are aligned. Therefore, by grasping the handle 17 and rotating the shaft 18, the pin 2 is inserted through the disc 19.
0 is advanced to engage the reference holes 3 and 4. Then, when I let go of my foot that was pressing on foot switch 37,
As the piston rod 29 of the air cylinder 27 contracts via the air compressor and the perforator 30 descends, the upper end of the printing plate 1 and the engagement groove 3 of the support plate 31 are
1a engages with each other. Then another foot switch 3
8, three perforators 3 are created by the compressor.
Air is supplied to the air cylinders 34 of 0, 40, and 41, and the piston rod 35 is extended to release the lever 32.
The cutting die 36 moves in the direction in which it enters the cutting die hole 31c. Therefore, there are reference holes 5 of the same shape in each cutting die 36 at three locations on the gripping side and the bottom side of the printing plate 1.
6 and 7 are drilled at the same time. After drilling, when the foot pressing the foot switch 38 is released, the piston rod 35 of the air cylinder 34 contracts and the cutting die 36 is removed from the printing plate 1. Then, by raising the perforator 30 again, the printing plate 1 can be taken out.

When the bottom edge 1b of the printing plate 1 taken out after drilling in this manner is inserted through the hole 43 of the pedestal 11, the printing plate 11 slides guided by the guide plates 44, 45 due to its own weight, and the horizontal axis 48, 49 and plate bending bar 51
The tip passes through between and comes into contact with the contact point of the limit switch 46. This closes the contact and operates the air cylinder 55 electrically connected to it.
The piston rod 54 expands and moves the plate bending bar 51 against the elastic force of the compression coil spring 52 to move the horizontal shaft 48,
Move in 49 directions. When the plate bending bar 51 moves between the upper and lower horizontal shafts 48 and 49, the printing plate 1 is pressed against the upper and lower horizontal shafts 48 and 49 by the plate bending bar 51, as shown by the chain line in FIG. , the printing plate 1 is bent into a dogleg shape. Air cylinder 55
When the air is removed, the plate bending bar 51 moves away from the horizontal shafts 48 and 49 while contracting the piston rod 54 due to the elastic force of the compression coil spring 52.
The printing plate 1 is released from the grip. The printing plate 1 is then taken out from the hole 43, but in this case, the short guide plate 45 allows the printing plate 1 to be taken out easily if this is cleared. In FIG. 1, the bending line of the printing plate 1 is indicated by the symbol 1c.

In order to mount the printing plate 1, which has been perforated and bent in this manner, onto the plate cylinder, the reference hole of the printing plate 1 must be inserted into the reference pin of the plate vise on the grip side of the plate cylinder, which has been accurately positioned in advance. After 6 and 7 are engaged, the printing plate 1 is pressed and held in the holding plate of the plate vise. After wrapping the printing plate 1 around the circumferential surface of the printing cylinder, the reference hole 5 of the printing plate 1 is engaged with the reference pin of the plate vise on the rear side of the printing cylinder, which has been accurately positioned in advance. The mounting of the printing plate 1 is then completed by pressing the printing plate 1 with the presser plate of the bottom plate vise and holding it in the mouth. In this case, when inserting the bottom edge 1b of the printing plate 1 into the bottom vise table, the printing plate 1 is bent from the bending line 1c, so the bottom side of the printing plate 1 that has been wrapped around the cylinder circumferential surface is Edge 1
b is oriented in the direction of the plate vise, so there is no need to press the printing plate 1 and try to bend it, and it can be easily inserted into the plate vise, and it can be held in its mouth by pressing it with a presser plate. After that, the printing plate 1 remains in close contact with the circumferential surface of the cylinder.

In addition, although the air cylinder 55 was illustrated as an example of a fluid cylinder in this Example, a hydraulic cylinder may be sufficient. Furthermore, if the horizontal shafts 48, 49 and the plate bending bar 51 are covered with an elastic material such as rubber, the surface of the printing plate 1 will not be damaged.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a pair of upper and lower horizontal shafts and one plate bending bar are supported inside the pedestal of a printing plate punching device, sandwiching the printing plate inserted from the opening of the pedestal. However, by activating a fluid cylinder via a switch whose contact point is closed when the tip of the plate comes into contact with the plate during insertion, and bending the plate by pressing it against the upper and lower horizontal axes with a plate bending bar, When the printing plate bent by this plate bending device is inserted into the vise on the rear side of the plate cylinder, the tip faces toward the vise, so it can be easily held in the vise, improving work efficiency. This also reduces preparation time and improves machine availability. In addition, the leading edge of the printing plate can be held deeply in the rear plate vise, and the printing plate will adhere well to the circumferential surface of the cylinder, so there will be no vibration of the contact roller or misalignment of printing, and the printed matter will be printed. Quality improves. Furthermore, since this device is installed using the pedestal space of the plate punching device, it does not require any space for plate bending.
Compared to the case where it is provided separately, the space is reduced, and the structure and operation are simple, reducing costs and improving work efficiency.

[Brief explanation of drawings]

1 to 7 show an embodiment of the plate bending device according to the present invention, FIG. 1 is a plan view of a printing plate that has been punched and bent, and FIG. 3 is a side view, FIG. 4 is a side sectional view and a side view of the positioning and fixing member for the holding side of the printing plate, FIG. 5 is a side view of the perforator for the bottom reference hole, and FIG.
The figure is a plan view of the main part of the plate bending device, and Figure 7 is the same as Figure 6.
It is an AA sectional view. 1... printing plate, 10... printing plate punching device, 11...
Frame, 11a... working side side plate, 11b... bottom plate,
12... plate, 42... plate bending device, 43... hole,
46...Limit switch, 48, 49...Horizontal axis, 51...Bend bending bar, 52...Compression coil spring, 55...Air cylinder.

Claims (1)

[Claims] 1. A hole for inserting a printing plate toward the bottom plate of the pedestal is opened in the work side side plate of a box-shaped pedestal supporting the plate holding plate of the printing plate perforation device, and a hole is opened at the top of the inserted printing plate located above the bottom plate. A switch whose contacts close when they come into contact, a pair of upper and lower horizontal shafts supported parallel to the printing plate surface on one side holding the insertion printing plate, and a pair of upper and lower horizontal shafts supported parallel to the printing plate surface, and the insertion printing plate being held parallel to these horizontal axes. A plate bending bar is supported on the other side of the horizontal shafts and is formed to be able to move forward and backward in a direction toward and away from a line connecting the axes of both horizontal shafts, and the plate bending bar is urged in a direction away from the line connecting the axes. A plate bending device comprising a spring member and a fluid cylinder actuated by closing of the contacts to move the plate bending bar between the upper and lower horizontal axes to bend the printing plate.