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Ribbon Feed Mechanism

IP.com Disclosure Number: IPCOM000096395D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Schaefer, JO: AUTHOR

Abstract

A ribbon feed mechanism for a typewriter has a pair of spindles 1 and 2 on which ribbon supply and take-up spools are mounted. The spools form part of cartridge 3 having openings in its lower surface to permit a mounting of the spools on the spindles.

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Ribbon Feed Mechanism

A ribbon feed mechanism for a typewriter has a pair of spindles 1 and 2 on which ribbon supply and take-up spools are mounted. The spools form part of cartridge 3 having openings in its lower surface to permit a mounting of the spools on the spindles.

Feeding of the ribbon is accomplished by oscillating member 4. This is while it is in position to drive either of ratchet wheels 5 and 6 which are fixed to spindles 1 and 2. Member 4 is mounted on plate 7. This is reciprocated by finger 8 engaging a cam 9 on a shaft which is rotated once on each typing operation. When the ribbon has been unwound from one spool, element 1 1 swings out from the spindle into the path of a stepped portion of plate 7. Such causes the latter to swing in a direction to engage member 4 with the other ratchet wheel.

Detent lever 12 has fingers 14 and 15. These are positioned selectively in the path of the ratchet teeth to prevent a driving of the wheels in the wrong direction. Stud 16 on the detent lever projects between forked portions 17 on plate 7 to cause pivoting of the lever as member 4 is moved from one ratchet wheel to the other. Locking of the detent lever in a neutral position is accomplished by rotating member 18 counterclockwise to engage finger 19 and trap it in notch 20.

When removing the ribbon spools from spindles 1 and 2, member 22 is rocked manually to actuate ribbon lift bail 23. Projection 24 on member 22 simultaneously rocks bail 25 to eject cartrid...