B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
B41F 31/02 (2006.01) B41J 17/02 (2006.01) B41J 17/32 (2006.01)
Patent
CA 2190240
A removable cassette (34) having a predetermined length (L) of ink web (W) bearing a printing ink is mounted adjacent to a thermal print head (30) with the ink web interposed between the sheet material and print head for printing graphic images on the sheet. A take-up spool (38) of the cassette defines a first overall diameter (D1) without receiving the ink web (W) from a supply spool (36) of the cassette, and a greater second overall diameter (D2) upon receiving the predetermined length (L) of ink web, wherein the second overall diameter (D2) is no more than 10% greater than the first overall diameter (D1). A spring-wrapped clutch (42) is drivingly connected between a take-up motor (40) and the take-up spool (38) to impart a constant torque (?c) to the take-up spool (38) for winding the ink web (W) onto the spool during printing operations and to thereby maintain a substantially constant tension (Tw) within the ink web.
Gerber Scientific Products Inc.
Ridout & Maybee Llp
LandOfFree
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