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Non-Contacting, Non-Reciprocating Stripper for Punch Machine

IP.com Disclosure Number: IPCOM000047861D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Cavalieri, VJ: AUTHOR [+2]

Abstract

Typical punching machines include a frame on which a die is mounted, one or more punches mounted on the frame above the die for reciprocal punch motion, and a stripper which is resiliently coupled to the punch and located between the punch and the die for dislodging the workpiece from the punch on the return stroke. When such a punching machine is employed for punching a large number of holes in a soft workpiece, e.g., a ceramic green sheet, the pounding of the stripper on the green sheet with each reciprocating punch cycle can damage the green sheet. Disclosed herein is a punch machine which includes a pair of internal stops for preventing the stripper from actually contacting the workpiece.

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Non-Contacting, Non-Reciprocating Stripper for Punch Machine

Typical punching machines include a frame on which a die is mounted, one or more punches mounted on the frame above the die for reciprocal punch motion, and a stripper which is resiliently coupled to the punch and located between the punch and the die for dislodging the workpiece from the punch on the return stroke. When such a punching machine is employed for punching a large number of holes in a soft workpiece, e.g., a ceramic green sheet, the pounding of the stripper on the green sheet with each reciprocating punch cycle can damage the green sheet. Disclosed herein is a punch machine which includes a pair of internal stops for preventing the stripper from actually contacting the workpiece. The stripper is maintained in close proximity to the workpiece during the entire punching cycle, and does not reciprocate with the punches. Referring to the figure, the punch machine 1 includes a frame 2 and a die 3. The fixed stripper plate 4 is coupled to bridge 5 and is maintained in close proximity to die 3 by internal die stop 6. Punch plate 7 having a plurality of punches 8 thereon is also coupled to bridge 5 via a cam arrangement 9 which permits reciprocal motion of punch plate 7 with respect to bridge 5. Operation of the punch machine is as follows. Bridge 5 rises, thereby moving punch plate 7 and stripper plate 8 away from die 3 and permitting insertion of a green sheet (not shown) on the die. Bridge 5 the...