Ink ribbon winding and reversing assembly

摘要

An ink ribbon winding and reversing assembly suitable for use in a printer having two ratchet wheels for winding ink ribbon spools and an ink ribbon cassette having two rotatably mounted ink ribbon spools is provided. The assembly includes a feeding lever formed with opposed pawls for driving a first ratchet wheel in a first winding direction in response to displacement of the feeding lever. A detecting lever formed with a central arm disposed between the spools is biased towards the unwinding spool and causes the feeding lever to be displaced toward the unwinding spool at completion of winding thereon in response to the feeding lever shifting engagement to drive the second spool. This reversal process is repeated at completion of winding in each direction. The central arm of the detecting lever is formed with lateral guide surfaces for permitting engagement of an ink ribbon spool and an ink ribbon cassette with the detecting layer in a single snap-in motion.