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Apparatus for Altering Ribbon Feed Increments

IP.com Disclosure Number: IPCOM000046244D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 80K

Publishing Venue

IBM

Related People

Blanck, TW: AUTHOR [+2]

Abstract

The ribbon feed increments for correctable film ribbon (CFR) and multistrike ribbon (MSR) are of necessity different. Disclosed is a mechanism which automatically changes ribbon feed increments upon the insertion of the appropriate CFR or MSR cartridge.

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Apparatus for Altering Ribbon Feed Increments

The ribbon feed increments for correctable film ribbon (CFR) and multistrike ribbon (MSR) are of necessity different. Disclosed is a mechanism which automatically changes ribbon feed increments upon the insertion of the appropriate CFR or MSR cartridge.

Turning now to the drawings, and especially Fig. 1, a ribbon cartridge 10 for feeding ribbon or the like 11 in a printer/typewriter is illustrated along with ribbon feed mechanism 20. The cartridge, if it contains a "clearance" hole 21, is utilized in conjunction with ribbon 11 which is a correctable film ribbon. With the clearance hole 21 not present, or a solid bottom on the cartridge 10, the cartridge will be available for use with ribbon 11 of the MSR variety. When the clearance hole 21 is present, it is desired that a fresh portion of the ribbon be positioned opposite the print element for each character to be struck, requiring a longer feed increment of the ribbon 11 than is necessary with MSR where very small increments are utilized and the ribbon is struck multiple times in an overlapping fashion.

A second aperture (not shown) in the bottom of the cartridge (or on the side if a spiked wheel-type drive is desired) is driven by a ribbon drive 23, which is coupled through a bracket member 24 and connected to a ribbon feed ratchet wheel 25 (see the inset drawing in Fig. 1 for appropriate location of the various parts). Mounted on the bracket is a feed pawl 26 having a rearwardly facing slot 27 and spring loaded, as by the spring 28, to effect reciprocation of the feed pawl 26 generally in the direction of the arrow 29. The feed pawl 26 is connected to a cam surface 30 which, upon rotation as by a motor 31, effects reciprocation of the feed pawl 26 against the ribbon feed ratchet wheel 25, effecting rotation of the drive 23. Clearly when reciprocation of the f...