JP3567347B2 - Plate bending equipment - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate bending apparatus that forms a bent portion at an edge of a printing plate for hooking when the printing plate is mounted on a plate cylinder of a printing press.
[0002]
[Prior art]
As means for mounting a printing plate on a plate cylinder of a printing press, a bent portion formed on an edge of the printing plate is sandwiched in a narrow groove provided on an outer surface of the plate cylinder. In the case of a printing plate, the springback after the bending operation is large, so that it is difficult to maintain the bent angle required for sandwiching the bent portion.
[0003]
As a conventional device of this type, a device in which a receiving surface of a punch is not concave but has an inclined surface is proposed in Japanese Utility Model Laid-Open No. 5-13744, in which an upper die of a press device and a metal pad are interposed via elastic means. The point of this is proposed in Japanese Utility Model Laid-Open No. 49493/1988, and the point that the punch is provided with a heating means is proposed in Japanese Patent Application Laid-Open No. 63-13619. The means has been proposed in Japanese Utility Model Laid-Open No. 4-47820.
[0004]
[Problems to be solved by the invention]
Here, the present invention intends to provide a device in which the bent portion can be formed at a desired bending angle, particularly in a printing plate made of a material having a large springback, such as a film-based printing plate. .
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a plate bending apparatus in which a bent portion is formed at an edge of a plate for mounting on a plate cylinder of a printing press. A punch (5) having heating means (6) itself provided with an edge (9) at the tip of a concave receiving surface (8) supported from below, and corresponding to the concave receiving surface (8) of the punch (5). A counter holder (14) having a concave pressure surface (16) to be pressed and applying a pressing force of a driving means (21) to the concave receiving surface (8) via an elastic means (17); and the counter holder (14). A bending part (34) in a state where the printing plate (33) is held between the punch (5) and the counter holder (14), and a die (18) interlocked via the elastic means (17). Edge portion (9) that bends the edge of the printing plate (33) A printing plate comprising a die (18) and a lifting member (31) which is lifted up in conjunction with the retraction of the counter holder (14) to push up the edge of the bent portion (34) of the printing plate (33). Bending equipment.
[0006]
[Action]
First, a printing plate on which a bent portion is to be formed at an edge is set on a main table of the apparatus. At this time, the counter holder and the die are in a so-called home position, that is, a raised position. Then, by lowering the counter holder, the pressing surface of the counter holder pushes down the printing plate, and when the printing plate is sandwiched between the pressing surface and the receiving surface of the punch, the concave portion of the receiving surface and the edge portion are in contact with each other. According to the configuration, the edge of the printing plate is bent upward, and then the die bends the edge between the edge and the edge to form a bent portion, wherein the punch is heated to a predetermined temperature. By doing so, it is possible to maintain a bent angle. After the folding operation, as the die and the counter holder return to the home position, the lifter raises the end face of the bent portion to facilitate removal of the printing plate from the apparatus.
[0007]
【Example】
First, FIG. 1 shows a state where each part of the apparatus occupies a home position. A main table 2 and a handle base 3 are formed on an underframe 1 of the apparatus. A punch 5 is fitted into a recess 4 formed in the underframe 1 between the bull 2 and the handle base 3.
[0008]
A heating means 6 such as a ribbon heater is attached to a side portion of the punch 5, and the heating means 6 is covered with a cover 7. The upper surface of the punch 5 constitutes a concave receiving surface 8 which is formed as a recess connected to the main table 2, and an edge 9 is formed at the tip of the receiving surface 8.
[0009]
On the underframe 1, a gate-shaped frame 13 composed of a front cover 10, a slide rail base 11, and a top cover 12 for connecting the front cover 10 and the slide rail base 11 is implanted. A die base 15 including a counter holder 14 cooperating with the punch 5 is provided, and the counter holder 14 having a pressing surface 16 having a shape matching the receiving surface 8 of the punch 5 is provided on the die base 15. And an elastic means, that is, a spring 17, and a side portion of the die base 15 is provided between the die main base 15 and the edge 9 of the punch 5 to perform a plate bending operation which will be described later. Are mounted.
[0010]
On the other hand, the support shaft 20 of an operation handle (only a part of which is shown) which constitutes a driving means supported by a handle bracket 19 formed on the handle base 3 via a support shaft 20 has: A spring 22 for always elastically holding the handle 21 at the position shown in FIG. 1 is mounted.
[0011]
The handle 21 is pivotally supported on one arm end of a bell crank 25 supported on the frame 13 via a support shaft 24 via a handle link 23, and the other arm end of the bell crank 25 is connected via a die link 26. Thus, it is pivotally supported by the bracket 27 of the die main base 15.
[0012]
An abutment surface 28 is formed near the one arm end of the bell crank 25, and the abutment surface 28 is brought into contact with a stopper screw 29 mounted on the front cover 10 so as to be able to move forward and backward. By operating the handle 21, the stroke amount for lowering the die base 15 can be determined.
[0013]
A lifter 32 having a lift member 31 whose operation will be described later is attached to the die main base 15 which moves up and down along a slide rail 30 formed inside the slide rail base 11. .
[0014]
Next, the bending operation of the edge of the plate by the plate bending apparatus of the present invention having the above-described configuration will be described in order. In FIG. 1 described above, a method of setting the printing plate 33 on the main table 2 is, for example, by inserting a fine hole provided in the printing plate 33 into a pin-shaped projection protruding at a predetermined position of the main table 2. The positioning method is adopted. FIG. 1 shows the printing plate 33 set in such a manner. At this time, the bent portion 34 at the edge of the printing plate 33 to be bent is formed by the edge portion 9 of the receiving surface 8 of the punch 5. Over the handle base 3 side.
[0015]
Hereinafter, an enlarged view of a main part will be described with reference to FIGS. FIG. 2 shows a state in which the operating handle 21 is rotated and the die main base 15 is pressed down, and the printing plate 33 is held between the receiving surface 8 of the punch 5 and the pressing surface 16 of the counter holder 14. As shown, the bent portion 34 of the printing plate 33 is directed obliquely upward. In this state, the spring 17 is not yet compressed, and the die 18 is in the intermediate position and is in contact with the printing plate 33. Absent.
[0016]
Next, when the die main base 15 is further pushed down, the pressing surface 16 of the counter holder 14 is already stopped from lowering by the receiving surface 8 of the punch 5 with the printing plate 33 interposed therebetween. Only the die main base 15 descends, where the bent portion 34 of the printing plate 33 is bent between the die 18 and the edge portion 9 as shown in FIG. At this time, the die 18 is provided with a notch 35 (see FIG. 2) corresponding to the thickness of the printing plate 33, so that the bending is performed smoothly.
[0017]
The holding time in the state shown in FIG. 3 is adjusted depending on the thickness and the material of the printing plate 33. However, since the punch 5 is heated by the above-described heating means 6, the setting after the forming is performed by the setting of the holding time as described later. Springback can be reduced as much as possible.
[0018]
The configuration and operation of the lifter 32 omitted in FIGS. 1 to 3 will be described in detail with reference to FIG. 4 in order to avoid complication of the drawing. The U-shaped member 37 that moves up and down in cooperation with the die main base 15 is provided. A spring 38 as a tension spring for constantly pressing the member upward is provided, and this member 31 is also provided on the lift member 31 disposed below the U-shaped member 37 in a vertical plane. A spring 39 as a compression spring that constantly presses upward is provided.
[0019]
When the U-shaped member 37 is in the first stage of the downward movement of the die main base 15, that is, when the counter holder 14 holds the printing plate 33 between the punch 5 and the elastic means 17 is not yet compressed, the U-shaped member 37 is in the U-shape. The lower edge 40 of the member 37 is separated from the upper edge 41 of the member 31.
[0020]
Next, when the die main base 15 further descends and starts to compress the elastic member 17, as shown by the imaginary line in FIG. , The lower edge 42 of the lift member 31 also descends, and the lifting piece 43 fixed to the lower edge 42 also descends. Not to be.
[0021]
Then, the die main base 15 is raised by the returning operation of the handle 21, and when the die 18 and the counter holder 14 return accordingly, when the die 18 and the counter holder 14 return, the lifting piece 43 of the member 31 interlocking with the vertical movement of the die 18 causes the plate 33 to move. Is pushed up to facilitate removal of the printing plate 33 from the apparatus. This is the state shown in FIG.
[0022]
FIG. 6 shows the relationship between the punch 5 and the die base 15 and the counter holder 14 as viewed from another angle, and the guides vertically mounted on the dies 44 at both ends of the die base 15. Pins 45, 45 are loosely inserted into the punch 5, and between the punch 5 and the dies 44, 44, helical springs 46, 46 for the guide pins 45, 45 are contracted. Projecting edges 48, 48 on both sides of the counter holder 14 are suspended from shoulders 47, 47 projecting inward from the 44, 44, and the spring 17 is contracted between the counter holder 14 and the die main base 15. It shows the state that was done.
[0023]
In the above embodiment, the edge 9 of the punch 5 has been described and illustrated as having a sharp corner. However, in some cases, the bent portion of the printing plate 33 may have a certain radius of curvature. In this case, the edge portion 9 is slightly rounded.
[0024]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the apparatus which comprises the said structure of this invention, there exists an effect that it becomes easy to obtain | require a desired bending angle by minimizing the springback after shaping of a bending part. .
[Brief description of the drawings]
FIG. 1 is a layout view of an embodiment of the apparatus of the present invention in a home position.
FIG. 2 is a partially enlarged explanatory view of a state in which a printing plate is held in an initial stage of a bending operation.
FIG. 3 is a partially enlarged explanatory view showing a state where an edge of a printing plate is bent.
FIG. 4 is a configuration diagram of a lifter.
FIG. 5 is a partially enlarged explanatory view after the bending operation is completed.
FIG. 6 is a view showing the relationship between the punch, the die base and the counter holder as viewed from another angle.
[Explanation of symbols]
Reference Signs List 5 punch 6 heating means 8 concave receiving surface 9 edge portion 14 counter holder 16 pressing surface 17 spring (elastic means)
18 Die 21 Operation handle (drive means)
31 members

Claims (1)

In plate bending apparatus that form a bent portion to the edge of the plate for mounting the plate cylinder of a printing press, a concave receiving surface (8 supporting plate springback is made from a large material (33) from below edge portion formed at the tip of) the (punch comprises 9) has a heating means to itself (6) (5), is configured to sandwich the plate (33) the concave receiving surface (8) to the relative A counter holder (14) having a pressing surface (16) to move downward through a driving means (21), and the concave receiving surface (8) and the pressing surface (16) formed by the counter holder (14). said plate protruding from the edge portion (9) by pressing (33) the bent portion of the die (18) in conjunction with the counter holder for bending (34) (14), the die (18) And the plate is lifted in conjunction with the retraction of the counter holder (14). Consisting a member for lifting (31) to push the edge of the bent portion (34) of 33), plate bending apparatus.

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