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Proportional Spacing Mechanism in Typewriters

IP.com Disclosure Number: IPCOM000096396D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Stoll, A: AUTHOR

Abstract

The mechanism achieves a spacing step adapted to the character width. Use is made of one single movable pawl which cooperates with the escapement wheel and with staggered, rockable stops.

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Proportional Spacing Mechanism in Typewriters

The mechanism achieves a spacing step adapted to the character width. Use is made of one single movable pawl which cooperates with the escapement wheel and with staggered, rockable stops.

Rack 1 of the carriage is constantly engaged with gear 2. Shaft 3 of gear 2 has mounted on it escapement wheel 4 and freely rockable pawl support 5. On pivot pin 6 of support 5, escapement pawl 7 is movably mounted. By rocking release lever 8 in the direction of the arrow, pawl 7 is disengaged from wheel 4 and rotated until it abuts stop 9. It is held in that position by hairpin spring 10. Support 5, which in the inoperative condition abuts stationary stop 11, is rocked under the action of draw spring 12 in the direction opposite to the rotation of wheel 4. Lever 8, which is thus disengaged, places itself against its stop 13. Pawl 7 supports roll 14 which on the rocking movement of support 5 moves against the curved guide of one of staggered stops 15, 16, 17 or 18. Thus pawl 7 is turned back and re-engaged with wheel 4. The entire action is performed at such a high speed that wheel 4 does not move due to the large bulk 7 of the carriage connected to it. It is only after pawl has been re-engaged that the carriage starts moving. Thus, support 5 is rocked back until it is again placed against its stop 11.

Stop 18 is mounted in a stationary position. Stops 15... 18 are rockably mounted on shaft 21 supported in bearings 19 and 20. In acco...