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Typebar Typewriter With Stroke Storage

IP.com Disclosure Number: IPCOM000090352D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Heidt, WA: AUTHOR

Abstract

Arythmic typing strokes are accepted without typewriter malfunction through the combination of self-storing actuation trigger 10 and a typebar driven interlock assembly 20. When keylever 11 is struck too closely following a previous key, trigger 10 is released by latch surface 12 being displaced below keeper surface 13 thus rendering spring 14 effective to exert counterclockwise rotating force on power cam 15. The latter is prevented from moving into clutching engagement with power roll 16, as is normally the case, by interlock leaf spring 17 which is pivoted about axis 18 by typelever 19 of the previously struck key. Cam groove 21 transfers motion from the typelevers 19 through ribbon lift bail 22 to the interlock assembly at the times when initiation of a subsequent cycle could cause a malfunction.

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Typebar Typewriter With Stroke Storage

Arythmic typing strokes are accepted without typewriter malfunction through the combination of self-storing actuation trigger 10 and a typebar driven interlock assembly 20. When keylever 11 is struck too closely following a previous key, trigger 10 is released by latch surface 12 being displaced below keeper surface 13 thus rendering spring 14 effective to exert counterclockwise rotating force on power cam 15. The latter is prevented from moving into clutching engagement with power roll 16, as is normally the case, by interlock leaf spring 17 which is pivoted about axis 18 by typelever 19 of the previously struck key. Cam groove 21 transfers motion from the typelevers 19 through ribbon lift bail 22 to the interlock assembly at the times when initiation of a subsequent cycle could cause a malfunction. When typelever 19 of the previously struck character reaches a condition where it is safe to initiate a new print operation, assembly 20 is rotated counterclockwise about axis 18 to remove spring 17 from its intercepting position with respect to the second selected cam 15. Spring 14 is now completely free to drive cam 15 into clutching engagement with roll 16 even though keylever 11 may still not be depressed by the operator at that instant.

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