US PATENT SUBCLASS 234 / 129
.~ With reversible work-feed (e.g., with back spacer)

Current as of: June, 1999
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234 /   HD   SELECTIVE CUTTING (E.G., PUNCHING)

128  DF  WITH WORK HOLDER OR MOVER {2}
129.~ With reversible work-feed (e.g., with back spacer)

DEFINITION

Classification: 234/129

(under subclass 128) Device provided with means capable of advancing a workpiece relative to a tool field in either of two opposed directions.

(1) Note. The "back spacing" mechanism on a card or tape punch is an example of such a device.

(2) Note. The work advance in this subclass (129) is preparatory to a cutting operation, i.e., not the ejection of work from the machine.

SEE OR SEARCH CLASS

83, Cutting,

220, for means to advance work in opposite directions, intermittently, in a cutting machine.

226, Advancing Material of Indeterminate Length, 49+, for selectively-operated means to reverse the direction of motion of a web.