Browse Prior Art Database

Impression Control

IP.com Disclosure Number: IPCOM000097984D
Original Publication Date: 1961-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Palmer, LE: AUTHOR

Abstract

In a single head typewriter, a drive mechanism is operated during a full print cycle w,hen printing large characters, and cut off just before the printing of small characters. This assures more uniform impressions.

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Impression Control

In a single head typewriter, a drive mechanism is operated during a full print cycle w,hen printing large characters, and cut off just before the printing of small characters. This assures more uniform impressions.

A switch 1 is normally closed during machine operation. Interposers 2, which effect the printing of large characters, move forwardly through notches 3 in a bail 4 and have no control of the switch 1. Interposers 5, for small characters, act on the bail and withdraw a latch 6 from a member 7, which is operated by a spring 8, to open the switch for de-energizing a drive motor. A cam 9 is connected to driven mechanisms in the machine and determines the time of movement by the member 7.

After the switch is opened, the driven mechanisms continue operation under inertia until the cycle is completed. The switch is closed again during this time under the action of cam 9. A member 10 also acts on the switch 1 for turning it on or off under the control of a manually actuated member 11.

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