US PATENT SUBCLASS 242 / 325.1
.~.~ Wound into superposed coil pair

Current as of: June, 1999
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242 /   HD   WINDING, TENSIONING, OR GUIDING

324  DF  UNWINDING AND REWINDING A MACHINE CONVERTIBLE INFORMATION CARRIER (E.G., MAGNETIC TAPE OR PHOTOGRAPHIC FILM) {13}
325  DF  .~ Endless coiled carrier (i.e., closed loop) {5}
325.1.~.~ Wound into superposed coil pair

DEFINITION

Classification: 242/325.1

Wound into superposed coil pair:

(under subclass 325) Subject matter wherein the endless information carrier is alternately wound in opposite directions between two spools provided with means to grip a middle portion of the carrier and simultaneously wind and unwind outward portions to form (or deplete) a double spiral winding.

(1) Note. Initially a first spool normally supports the carrier wound into a double spiral winding with an exterior

work loop having, (a) a functioning leg extending past a work station, and (b) an idling leg passing directly to a second spool, so that both legs are simultaneously unwound from the first spool and wound onto the second spool. The first leg is moved past the work station and is thus utilized while the second leg is idly wound directly onto the second spool. Next, the drive direction is reversed to feed the second (previously idle) leg past the work station to utilize the remainder of the carrier, while the first (previously utilized) leg now directly winds back to the first spool. The whole coil has passed through the work station and is ready for replay without rewinding.