JPS6032916Y2 - Knockout device for press machines - Google Patents

Description

[Detailed description of the invention] The present invention relates to a knockout device for a press machine for punching and pressing printed circuit boards, etc. The present invention is a press that transmits pressing force to punching pins while making it possible to increase the size of the knockout cylinder. The purpose is to eliminate plate deformation, improve product quality, and increase the durability of punching pins.

In the conventional knockout device, as shown in FIG. 8, the moment 8' of the knockout cylinder C is transmitted from the ram 1 of the press machine to the movable frame platen 2 while pushing down the presser plate 5 via the knockout pin 9. By transmitting the punching work force to the press plate 3 via the auxiliary frame board 40,
The structure is such that punching is performed using a punching pin 10 supported on a press plate, and after the punching process, the product that is inserted through the punching pin 10 is knocked out by a presser plate 5. Since the structure was such that the punching force could not be transmitted from the movable frame board 2 to the press plate 3 within the outer diameter, the press plate 3 propagated the punching force from the periphery to the center using the peripheral support structure. Due to its structure, the press plate 3 becomes thicker and larger at the same time.

Even if the press plate 3 is made thicker and larger, the central part of the press plate 3 deforms into a convex curved shape during repeated punching operations, and as a result, the punch pin 10 becomes more inclined in its vertical position. It becomes difficult for the punching pin 10 of the presser plate 5 to fit smoothly into the through hole 13, and a bending moment acts on the punching pin 10, making the punching pin 10 more likely to break and reducing its durability. In addition, there was a problem in that the quality of printed circuit boards etc. to be punched could not be perfected.

Furthermore, in the case of the above structure, the piston pad 8a'
Since it becomes difficult to increase the size of the presser plate 5, it is not possible to increase the size of the presser plate 5, and there is a limit to the size of the product.

In order to solve the above-mentioned drawbacks, the present invention creates an insertion hole vertically in the piston within the outer periphery of the piston of the knockout cylinder, and inserts a force transmitting body into this insertion hole so as to be able to move up and down relatively freely.
By interposing this power transmission body between the movable frame plate and the press plate, the downward punching work force from the movable frame plate to the press plate is transmitted through the force transmission body within the outer diameter of the piston of the knockout cylinder. It is what makes it possible.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows a front view of the crank press machine P, with ram 1
A knocker device K of a press machine for punching printed circuit boards is removably attached and fixed to the lower surface of the board.

The knockout device has a movable frame board 2 as a main frame, and a press plate 3 and a support frame 4 are stacked in order under the main frame and connected together as a unit with connecting bolts 6. It is attached to the ram 1 of the press machine P by fixing it to the lower surface of the ram 1 with a mounting bolt 7.

A piston 8 of a knockout cylinder C in the center of the movable frame board 2 is configured to be able to push down and drive a presser plate 5 which is vertically movably supported on a support frame 4 via a knockout pin 9.

The press plate 3 is cut out from a lower pin holder plate 3b and an upper press plate main body 3a, and a large number of punch pins 10 are inserted and supported in parallel in a downward position in the pin holder plate 3b. The top of the punching pin 10 faces the upper surface of the pin holder plate 3b and is pressed by the press plate main body 3a, and as the ram 1 descends and rises, the punching pin 10 is punched down and lowered via the movable frame board 2 and the press plate 3. Formed to rise again.

Then, as the ram 1 of the press machine P descends, the knockout device K descends, and just before the bottom dead center, the punching pin 10 When the ram 1 returns and rises, that is, when the punching pin 10 returns and rises, the punched printed circuit board 11 is knocked out, which rises in a posture stuck on the punching pin 10 by the pressing down driving force of the holding plate. It is formed like this.

The knockout pin 9 is inserted into a guide hole 12 formed vertically in the press plate 3 so that it can be guided up and down, and its upper end surface is in contact with the lower surface of the piston 8 and its lower end surface is in contact with the upper surface of the presser plate 5. There is.

At the same time, the punching pin 10 is inserted into and guided through a through hole 13 vertically formed in the holding plate 5 so as to be able to move up and down.

Pressure oil is supplied from the oil passage 15 to the oil chamber 14 of the knockout cylinder C, and the cushioning and knockout operations are performed as described above. In order to spread the force as uniformly as possible over the entire surface of the plate 3, a power transmitting body 16 is attached longitudinally through the piston 8 in the following manner.

That is, four longitudinal power transmission body insertion holes 17 are formed in the piston pad 8a at the lower part of the piston 8 within the outer circumferential surface of the piston 8, and the power transmission body 16 is loosely inserted into these and fixed. At the same time as being fastened to the movable frame board 2 via the bolts 18,
Each of these power transmission bodies 16 is interposed between the movable frame board 2 and the press plate 3, and its lower end surface is in contact with the press plate 3.

In this way, the downward punching work force is transmitted from the movable frame board 2 to the press plate 3 by the power transmission body 16 disposed within the outer diameter of the piston 8 of the knockout cylinder C.

Incidentally, after the piston 8 has descended, the return bolt 19a is pushed upward by the elastic force of the return spring 19, and the piston 8 is returned to its original position.

Further, the reference numeral 20 is a stopper, and the piston pad 8
A nut 20b fixed to the tip of a screw 20a screwed into the nut 20a comes into contact with the locking surface 20c of the movable frame board 2, and the lower limit position of the piston 8 is set.

Here, considering the load conditions, if the power transmission body 16 is not attached in FIG. 2, the press plate main body 3a
A punching pin 10 is used when punching out a circular plate with a diameter that is approximately fixed.
The reaction force from will act upward, in this case,
The stress acting on the press plate body 3a is D”/12([)・
Since it is proportional to the piston diameter, t...the plate thickness of the press plate body), by attaching the power transmission body 16, for example, D can be shortened to a value equivalent to about 70% of that. If possible, the stress on the press plate main body 3a could be halved.

That is, the thickness t of the press plate main body 3a is made as thin as possible, and the press plate main body 3a is prevented from bending, thereby greatly improving the quality of printed circuit board punching and increasing the durability of the punching pins 10. can be increased.

Another embodiment of the present invention will be described below.

(a) As shown in FIG. 4, the stopper 3 is attached to the power transmission body 16
Add 0.

That is, the small-diameter fastening part 16b is extended from the upper end of the power transmission body 16 and inserted into the vertical hole of the movable frame board 2, and the hollow 16c is screwed onto the top of the fastening part 16b, and the inside of the power transmission body insertion hole 17 is inserted. The power transmission body 16 is fixed to the movable frame board 2 by sandwiching the movable frame board 2 between the power transmission body main body 16a and the nut 16c located at.

When tightening the nut 16c described above, tension is applied to the fastening part 16c while tightening, thereby bringing the fastening part 16b into a pretensioned state.

In this way, the screw-fitting portion of the power transmission body 16 becomes strong against repeated impact loads during press working, and its lifespan is significantly extended.

Further, the lower half of the power transmission body main body 16a is made slightly larger in diameter, and a locking portion 30c with an upward locking surface is provided, and a locked portion 30b facing the locking portion 30c from above is connected to the piston 8. At the lower limit position of the piston 8, the locking portion 30c
The stopper 30 is configured such that the locked portion 30b abuts and locks the stopper 30.

(b) As shown in FIG. 5, the coil spring 21
6 is urged upward against the piston 8, and the upper end surface of the power transmission body 16 is formed so as to always come into contact with the lower surface of the movable frame board 2.

(C) As shown in FIG. 6, the force transmitting body 16 is inserted into the piston pad 8a of the piston 8 of the cushion cylinder C, and the force transmitting body is inserted into the force transmitting body insertion hole 17 extending vertically through the center of the piston 8. 16 and seal 22 to seal the oil chamber 14.
Seal the pressure oil.

In this way, the power transmission body 16 also extends through the piston body 8b.
By using this, the load conditions of the press plate 3 are further improved.

7) As shown in FIG. 7, the piston 8 of the cushion cylinder C is a cylindrical piston, and the force transmitting body 16 is inserted into the piston 8 in a longitudinal manner.

Reference numeral 22 is a seal, and 30 is a stopper.

Since the present invention is configured as described above, it has the following effects.

A power transmitting body is inserted into a power transmitting body insertion hole formed in the piston inside the outer periphery of the piston of the knockout cylinder so as to be relatively movable up and down, and this power transmitting body is sandwiched and interposed between a movable frame plate and a press plate. As the downward punching work force can be transmitted from the movable frame board to the press plate through this power transmission body, even if the holding plate is made larger and the piston is made larger,
Press force can be transmitted to the press plate not only from the periphery but also to the central part using the force transmitting element.

As a result, the load conditions on the press plate are greatly dispersed and relaxed, preventing deformation, maintaining the vertical posture of the punching pin, eliminating breakage of the punching pin, and greatly improving its durability. Since the punching pin is driven correctly without being misaligned with respect to the lower mold, the quality of punching is also significantly improved.

At the same time, not only can the press plate be made thinner, but also the power transmission area of the outer circumferential portion of the press plate for transmitting force from outside the outer circumference of the piston can be reduced, so the planar dimensions of the press plate can also be made smaller. can.

Furthermore, with the conventional structure in which the punching force is transmitted only from outside the outer periphery of the piston, there is a limit to the size of the piston pad, so it is difficult to increase the size of the presser plate, that is, to increase the size of the product. However, with the structure of the present invention, in which power is transmitted by a force transmitting body that extends vertically through the piston, it is possible to increase the size of the piston pad, that is, to increase the size of the product.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a front view of the crank press machine, Fig. 2 is a cross-sectional plan view of the main part, and Fig. 3 is a cross-sectional view of the crank press machine.
Figures 4 and 5 are enlarged vertical sectional front views of main parts of different embodiments; Figures 6 and 7 are longitudinal sectional front views of main parts of other embodiments; FIG. 8 is a diagram corresponding to FIG. 1 of the conventional device. P: Press machine, C: Curved/knockout cylinder, 1: Ram, 2: Movable frame board,
3...Press plate, 3a...Press plate main body, 3b...Zen holder plate, 5...Press plate, 8...Piston, 8a... ... Piston pad, 9 ... Knockout pin, 10 ...
...Punching pin, 12...Guide hole, 13...
...Through hole, 16... Power transmission body, 16a...
・・Power transmission body body, 16b・・Fastening part, 16c・
...Nut, 17...Power transmission body insertion hole, 3
0...stopper 30b...locked part, 30c...locking part.

Claims (1)

[Claims for Utility Model Registration] 1. A large number of punching pins 10 are fixed downwardly in parallel via a press plate 3 to a movable frame plate 2 fixed to a ram 1 of a press machine P. As it descends and rises,
The punching pin 10 is configured to move downward for punching and return upward via the movable frame board 2 and the press plate 3, and configured to be able to drive the presser plate 5 down with the piston 8 of the knockout cylinder C via the knockout pin 9. By doing so, the punched material attached to the punching pin 10 is knocked out by the downward driving force of the presser plate 5 when the punching pin 10 returns and rises. Each punching pin 10 is inserted into the plurality of drilled through holes 13 so as to be movable up and down, and the knockout pin 9 is inserted into the guide hole 12 opened vertically in the press plate 3 so that it can be guided up and down, and the knockout cylinder C is inserted. The piston 8 of the knockout cylinder C is installed facing downward into the movable frame plate 2, and the power transmission body insertion hole 1 is formed from the outer periphery to the inner periphery of the knockout cylinder C.
7 in the vertical direction, and insert the power transmitting body 16 into this power transmitting body insertion hole 17.
is inserted so that it can move up and down relatively freely, and the power transmission body 16 is sandwiched and interposed between the movable frame plate 2 and the press plate 3, thereby transferring the downward punching work force from the movable frame plate 2 to the press plate 3. The power transmission body 1 is located within the outer diameter of the piston 8 of the knockout cylinder C.
6. A knockout device for a press machine, characterized in that it is configured to be able to transmit data. 2 Utility Model Registration In the knockout device for a press machine described in claim 1, the press plate 3 is formed of a press plate main body 3a and a pin holder plate 3b, and this press plate main body 3a is attached to the lower surface of the movable frame plate 2. At the same time, a pin holder plate 3b is stacked on the lower surface of the press plate main body 3a. 3. In the knockout device for a press machine described in claim 1 or 2 of the utility model registration claim, a piston pad 8a is provided at the lower part of the piston 8 of the knockout cylinder C.
A power transmission body insertion hole 17 is formed in this piston pad 8a.
The power transmission body 16 is inserted into the power transmission body insertion hole 17 so as to be relatively movable up and down. 4. In the knockout device for a press machine described in any one of claims 1 to 3 of the claims for utility model registration, the fastening portion 16b is extended from the upper end of the power transmission body 16 to connect the vertical hole of the movable frame board 2. and screw the nut 16c onto the top of the fastening portion 16b to connect the power transmission body 16a and the nut 16C.
A power transmission body 16 is fixed to a movable frame plate 2 with the movable frame plate 2 sandwiched therebetween. 5 Utility Model Registration In the knockout device for a press machine described in claim 4, a locking portion 30c having an upward locking surface is provided on the power transmission body main body 16a located in the power transmission body insertion hole 17, and A stopper 30 is formed by forming a locked portion 30b on the piston 8 that faces the locking portion 30c from above.