Browse Prior Art Database

Ribbon Drive Mechanism

IP.com Disclosure Number: IPCOM000091964D
Original Publication Date: 1968-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Lagergren, RE: AUTHOR

Abstract

The ribbon drive mechanism is compensated for the amount of material accumulated on takeup spool 1 to provide a constant length feed. Ribbon feed cam 2 rotates in the direction of arrow A with follower arm 3 maintained in contact with it by torsion spring 4. Arm 3 is pivotally mounted about stud 5 and, when rotated counterclockwise in the direction of arrow B, drives arm 6. Arm 6 is urged against stud 7 by torsion spring 8 and is mounted about shaft 9 by roller clutch 10. This affords a driving connection between arm 6 and shaft 9 in the pivotal direction of arrow C. Shaft 9 carries spool 1 which rotates in unison with it to take up ribbon on the spool. Shaft 9 is retained in the driven position by an antibackup clutch which permits shaft 9 to rotate only in the direction of arrow C.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 90% of the total text.

Page 1 of 2

Ribbon Drive Mechanism

The ribbon drive mechanism is compensated for the amount of material accumulated on takeup spool 1 to provide a constant length feed. Ribbon feed cam 2 rotates in the direction of arrow A with follower arm 3 maintained in contact with it by torsion spring 4. Arm 3 is pivotally mounted about stud 5 and, when rotated counterclockwise in the direction of arrow B, drives arm 6. Arm 6 is urged against stud 7 by torsion spring 8 and is mounted about shaft 9 by roller clutch 10. This affords a driving connection between arm 6 and shaft 9 in the pivotal direction of arrow C. Shaft 9 carries spool 1 which rotates in unison with it to take up ribbon on the spool. Shaft 9 is retained in the driven position by an antibackup clutch which permits shaft 9 to rotate only in the direction of arrow C. The length of feed is adjusted by moving stud 7 with respect to stud 5.

A long feed occurs when arm 11 pivots in the direction of arrow D, engaging stud 12 and pivoting arm 13 in the direction of arrow E. Lever 14 is pivotally mounted about stud 15 carried by arm 3 and is pivoted by arm 13 driving against stud 16 to a position at which projection 17 drives stud 18, thus pivoting arm 6.

The length of drive stroke is compensated by rotation of sensor arm 19 as projection 20 senses an accumulation of material wound on spool 1 and pivots in the direction of arrow F. Rotation of arm 19 raises compensator link 21 which prevents arm 3 from following the profile of cam...