US 4,929,276 AGranted

Multitool punch holder

AssigneeMurata Wiedemann, Inc.

InventorsVictor L. Chun, James R. Hunter, George Jaworski

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Abstract

A multitool punch holder (12) having a head member (26) coupled to a punch press ram (16) as the press upper turret plate (22) rotates to bring the punch holder (12) into alignment with the ram (16). The punch holder (12) includes a rotary tool carrier (56) carrying a series of punches (80), each able to be selectively rotated into alignment beneath a striker rod (100) slidably mounted in a non rotating body member (30). Stroking of the ram (16) causes an engagement feature (108) to engage the striker rod (100) when the head member (26) telescopes into the body member (30) after axial movement of the holder (12) is arrested by contact with the workpiece (120). The striker rod (100) is then driven to force the coupled individual punch (80) into the workpiece (120). The striker rod (100) is urged to a raised position by an encircling stripper spring (110). A separation spring (42) urges the ram (16) and body member (30) to retracted position with the striker rod (100) out of engagement with the ram engagement feature (108). A detachable striker plate (88) of urethane provides non-marring contact with the workpiece (120).

In combination with a multitool punch holder (12) for engagement with a reciprocating ram (16) of a punch press apparatus (10), said multitool punch holder (12) including a rotary tool carrier (56) holding a circumferential array of punches (80) and enabling selective ram driving of any one of said plurality of punches (80) by rotation of said tool carrier (56) about an axis by an indexing drive therefor, characterized by a body member (30) interposed between said tool carrier (56) and said ram (16);

a coupling means (26) connecting said ram (16) to said body member (30) to prevent rotation but allow relative axial movement therebetween;
a striker rod (100) extending parallel to said punches (80) and slidably mounted in said body member at a location offset from the axis of rotation of said carrier so as to be aligned with each punch (80) successively as said tool carrier (56) is rotated;
a stripper spring (110) urging said striker rod (100) to an elevated position in said body member (30) above said punches (80);
said striker rod (100) having an upper end extending above said body member (30) and a lower end adapted to engage a punch;
an engagement feature (108) on said ram (16) located to engage said striker rod (100) upper end after a predetermined relative axial movement between said ram (16) and said body member (30) from a separated position;
separator spring means (42) urging said ram (16) and said body member (30) apart to said separated position;
whereby upon continued downward movement of said ram (16), driving engagement of said body member (30) with a workpiece (120) arrests further downward movement of said body member (30), said separator spring means (42) thereafter overcome to cause said ram engagement feature (108) to engage and advance said striker rod (100), by continued downward movement of said ram (16) against the resistance of said stripper spring (110) enabling said striker rod (100) to contact and drive a punch (80) disposed beneath said striker rod (100) to cause punching of said workpiece (W) by said punch (80).

4 more elements

Abstract

Claims12