Cutting – Means to drive or to guide tool – Magnet- or solenoid-actuated tool
Patent
1990-05-08
1992-01-14
Bilinsky, Z. R.
Cutting
Means to drive or to guide tool
Magnet- or solenoid-actuated tool
227131, B26D 508
Patent
active
050799835
ABSTRACT:
A punch holder has brazed thereon a copper disk and receives a punch extending therethrough. The holder is in registry with an upper punch guide/punch down-stop and has a spring extending therethrough for controlling axial movement of the punch. A lower punch guide and stripper bushing also receive and guide the punch in coaxial alignment therewith. In operation, a magnetically energized coil repulses the disk, which, in turn, imparts downward punching force to the punch with the spring providing restorative force. The disk is fully supported by the punch holder substantially along its radius, thereby preventing distortion. The spring provides constant force over the deflection range, thereby enhancing the punching action while improving reliability and reducing failures. Due to the punch being releasably attached to the punch holder-disk, it may be separately replaced. A sliding contact and aligning tolerance is provided only at opposing ends of the punch between the punch and the lower guide through which it extends at its distal end, and between the punch holder O.D. and upper punch guide I.D. at the proximal end. A repairable head is provided thereby avoiding previous practice of discarding entire defective head assemblies.
REFERENCES:
patent: 3141171 (1964-07-01), Doyle et al.
patent: 4821614 (1989-04-01), Fleet et al.
patent: 4872381 (1989-10-01), Stroms
patent: 4934236 (1990-06-01), Gordon
Bilinsky Z. R.
Carwell Robert M.
International Business Machines - Corporation
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