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Ribbon Guide Arm

IP.com Disclosure Number: IPCOM000047881D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Cahill, DP: AUTHOR

Abstract

Ribbon 1 is positively guided by arm 2 onto take-up spool 3. Arm 2 is pivoted at stud 4 and has upper and lower flanges 5 which straddle spool 3 to fix the position. Arm 2 may be mounted in a typewriter ribbon cartridge (not shown) with stud 4 being molded into the bottom wall of the cartridge. Arm 2 centers ribbon 1 on spool 3 to insure smooth and reliable take-up. Arm 2 pivots on stud 4 and is held in contact with spool 3 by the tension in ribbon 1 resulting from normal winding by take-up spool 3. This contact brings flanges 5 around spool 3, thereby centering arm 2 on the outside of spool 3. Arm 2 forms a smooth arc away from spool 3, a shape such that even a completely taken-up ribbon on spool 3 will only contact the end of arm 2. Arm 2 has upper and lower guide ridges 7 which hold ribbon 1 from slipping out of arm 2.

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Ribbon Guide Arm

Ribbon 1 is positively guided by arm 2 onto take-up spool 3. Arm 2 is pivoted at stud 4 and has upper and lower flanges 5 which straddle spool 3 to fix the position. Arm 2 may be mounted in a typewriter ribbon cartridge (not shown) with stud 4 being molded into the bottom wall of the cartridge. Arm 2 centers ribbon 1 on spool 3 to insure smooth and reliable take-up. Arm 2 pivots on stud 4 and is held in contact with spool 3 by the tension in ribbon 1 resulting from normal winding by take-up spool 3. This contact brings flanges 5 around spool 3, thereby centering arm 2 on the outside of spool 3. Arm 2 forms a smooth arc away from spool 3, a shape such that even a completely taken-up ribbon on spool 3 will only contact the end of arm 2. Arm 2 has upper and lower guide ridges 7 which hold ribbon 1 from slipping out of arm 2. This assembly keeps the take-up spool in the proper plane and reduces the tendency of the ribbon to slip off the spool during momentary high tension in the ribbon, which disables the feed system. Keeping the take-up spool in the proper plane maintains the torque required to rotate it at an acceptable level.

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