Marking tool holder for a punch press
AssigneeMurata Wiedemann, Inc.
InventorsVictor L. Chun, James R. Hunter, George Jaworski
Life of this patent
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Abstract
A marking tool holder (10) for a punch press, in which a plurality of marking tools (46) are mounted in an indexing carrier (38) for selective activation by the press ram (14). A non-positive connection effects driving of the preselected marking tool (46) to eliminate the need for precise adjustment of the marking tool position. In a first embodiment, a pair of very stiff springs (138) are interposed between a ram engaged plunger (124) and a striker (70), while in the second embodiment, a striker mass (158) attached to the striker (70) and carried in a body member (60) which is accelerated by the ram (14) to generate kinetic energy converted into a marking pressure when the marking tool (46) impacts the workpiece (W).
Claims7
In combination with a marking tool holder (10) for a punch press of the type including a ram (14) adapted to be stroked and cause a selected one of a plurality of marking tools (46) carried in the holder (10) to be forced against the surface of a workpiece (W) and make an impression therein, driving means (124, 126, 138, 134, 150, 70) acting between said ram (14) and said selected marking tool (46) causing said movement of marking tool (46);
- characterized by stiff spring means (138) interposed between said ram (14) and said selected marking tool (46), said driving means causing advance of said selected marking tool (46) a distance towards a workpiece such that said stiff spring means is only very slightly compressed by stroking of said ram (14) to force a marking tool (46) against the surface of a workpiece (W), whereby said interposed stiff spring means (138) accommodates slight variations in said marking tool position to insure proper marking pressure without adjustment of said marking too position.
In combination with a marking tool holder (10) for a punch press of the type including a ram (14) adapted to be stroked and cause a selected one of a plurality of marking tools (46) carried in the holder (10) to be forced against the surface of a workpiece (W) and make an impression therein, driving means (124, 126, 138, 134, 150, 70) acting between said ram (14) and said selected marking tool (46) causing said movement of marking tool (46);
- a striker mass (158) accelerated by stroking of said ram (14), said striker mass (158) separately movable from said ram (14) from a rest position in the direction of movement of said ram (14), means (70) connecting said striker mass (158) to said selected marking tool (46) to be moved therewith;
- said ram (14) coupled to said body member (60) with a lost motion yielding connection means (16, 108, 120) allowing said ram (14) to initially move relatively towards said body member (60) when movement of said body member (60) is arrested by contact with a workpiece (W);
- a bumper (90) drivingly connected to said body member (10) arranged to contact a workpiece surface prior to contact of a marking tool (46) with said workpiece (W), upon stroking of said ram (14) whereby said ram (14) accelerates said striker mass (158) until said bumper (90) contacts a workpiece (W) and said striker mass (158) thereafter continues movement until contacting said workpiece (W) with said marking tool (46), kinetic energy of said striker mass (158) thereby generating a marking pressure.
Dependencies are inferred from the claim text.