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Variable Speed Ribbon Drive Mechanism

IP.com Disclosure Number: IPCOM000049384D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Hagiwara, K: AUTHOR

Abstract

In order to improve the yield of an ink ribbon in a typewriter or printer, the ribbon can be driven at variable speed to provide different ribbon feed pitches for the operator's preference which may depend on the kind of ribbon and the usage of the printed sheet.

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Variable Speed Ribbon Drive Mechanism

In order to improve the yield of an ink ribbon in a typewriter or printer, the ribbon can be driven at variable speed to provide different ribbon feed pitches for the operator's preference which may depend on the kind of ribbon and the usage of the printed sheet.

Referring to the figures, a ribbon drive mechanism contains a gear 1 driven by a motor (not shown) through drive gears. The gear 1 is keyed to a shaft 2 which is mounted with a lower pulley 3 fixedly and an upper pulley 4 slidably. Also, a drive shaft 5 for a ribbon cartridge is mounted with a further upper pulley 6 fixedly and a further lower pulley 7 slidably. An endless belt 8 is rounded over the pulleys to operatively connect the gear 1 with the shaft 5. A change lever 9 is provided for slidably moving the pulleys 4 and 7 through a cam 10 mounted on a cam shaft 11, a cam follower 12 and arms 13 and 14. The cam is tapered at its surface to have its thickness so varied that the cam follower 12 is moved upward, when the cam 10 is rotated clockwise by the change lever 9 being manually handled, to displace the pulleys 4 and 7 from their normal positions "a" and "b" to the lifted positions "a'" and "b'", respectively. Also, the pulleys 3, 4 and 6, 7 are so tapered at their outer surface that the pulleys 3 and 4 have their effective diameters for the belt increased and the pulleys 6 and 7 have those decreased when the pulleys 4 and 7 are moved upward by the change lever...