Machine element or mechanism – Mechanical movements – Reciprocating to reciprocating
Patent
1996-11-19
1999-03-16
Bonck, Rodney H.
Machine element or mechanism
Mechanical movements
Reciprocating to reciprocating
100266, 100291, 72315, 724529, B21D 3708
Patent
active
058815996
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cam for a press die.
BACKGROUND ART
A cam for a press die is generally comprised of a movable cam slide having a cam surface, a cam driver for moving the cam slide by abutting against the cam surface of the cam slide, and a returning means for returning the cam slide to its original position. As the returning means, there is one in which a hole is formed in a base member of a lower die or an upper die, a guide pin of a coil spring is embedded in the cam slide, and the coil spring is inserted and fixed in the hole formed in the base in such a manner as to surround the guide pin. Additionally, there is a returning means which uses a spring unit.
According to the former returning means, to withdraw the cam slide from the cam, it is necessary to remove an end plate from the base member of the upper die or the lower die, and then to move the cam slide in such a way that the coil spring and the guide pin are located outside the hole in the base member. In a case where this movement of the cam slide cannot be effected due to an interfering object or the like, the withdrawal of the cam slide alone from the cam becomes impossible, so that, under the situation, the overall cam must be removed from the die.
On the other hand, according to the latter returning means, since this returning means is arranged such that a coil spring and the like are provided outside and below the cam slide, a large installation space is required, and it is difficult to provide a sliding guide surface below the cam slide to slidingly guide the movement of the cam slide. Since these members are provided in such a manner as to avoid the spring unit, the transverse width of the cam slide becomes large, which also requires a large installation space. Hence, this type of returning means is not very satisfactory.
The present invention has been devised in view of the above-described aspects, and it is an object of the present invention to provide a cam for a press die which makes it possible to easily withdraw the cam slide alone in the fabrication of the die, maintenance, inspection, and the like, and which makes it possible to reduce its occupying space.
DISCLOSURE OF INVENTION
In accordance with the present invention, the above-described object is attained by a cam for a press die, comprising: a movable cam slide having a cam surface, a cam driver for moving the cam slide by abutting against the cam surface of the cam slide, and returning means for returning the cam slide to its original position, wherein the returning means includes a coil spring which is disposed in a bottomed hole formed in the cam slide and whose one end abuts against the cam slide, and holding means for holding the coil spring, and the holding means includes a rod which is passed through the cam slide and extends through the bottomed hole in such a manner as to be surrounded by the coil spring, and a spring seat which is provided at one end portion of the rod at a bottomed-hole side so as to receive another end of the coil spring.
In a preferred example of the present invention, an expanded portion for preventing the rod from coming off the cam slide is formed at another end portion of the rod. In addition, although the cam slide may be either of a lower-mounted cam type or of a suspended cam type, in preferred examples, in the case of the lower-mounted cam type, a rectangular recess is formed in a base of a lower die side, while in the case of the suspended cam type, a rectangular recess is formed in a base of an upper die side. The cam slide is disposed movably in the rectangular recess, the rod is disposed between a front wall and a rear wall of the rectangular recess side, and the spring seat is capable of abutting against the front wall. Incidentally, sliding members which respectively abut slidably against a bottom wall and side walls of the rectangular recess may be respectively attached to a bottom wall or an upper wall and side walls of the cam slide. Further, a stepped portion may be formed at each of sid
REFERENCES:
patent: 3858427 (1975-01-01), Euteneuer et al.
patent: 4802393 (1989-02-01), Gruchalski et al.
patent: 5101705 (1992-04-01), Matusoka
patent: 5231907 (1993-08-01), Matsuoka
patent: 5269167 (1993-12-01), Gerhart
Morioka Hideyuki
Sasahara Tadashi
Bonck Rodney H.
Joyce William C.
Oiles Corporation
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