Browse Prior Art Database

Escapement

IP.com Disclosure Number: IPCOM000050329D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Jennings, JH: AUTHOR [+2]

Abstract

This escapement mechanism is for a 10 or 12 (one pitch shown) pitch escapement and comprised of seven moving parts. This simplified escapement mechanism comprises escapement pawl 10 and latch pawl 12 held in rack 14 by springs 16 and 18. Pawl 10 is mounted to pawl carrier 20 by studs 22 and 24. Spring 16 is grounded to pivot 26, biasing pawl carrier 20 and escapement pawl 10 into the teeth of rack 14.

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Escapement

This escapement mechanism is for a 10 or 12 (one pitch shown) pitch escapement and comprised of seven moving parts. This simplified escapement mechanism comprises escapement pawl 10 and latch pawl 12 held in rack 14 by springs 16 and 18. Pawl 10 is mounted to pawl carrier 20 by studs 22 and 24. Spring 16 is grounded to pivot 26, biasing pawl carrier 20 and escapement pawl 10 into the teeth of rack 14.

As lever 28 moves to the right, pawl carrier 20 moves to the left. Because of angled slot 30, stud 22, which is grounded to pawl carrier 20, forces the escapement pawl out of rack 14 and the pawl carrier slot 32 can move further to the left, moving escapement pawl 10 with it. The stud 22 and angled slot 30 keep escapement pawl 10 out of rack 14 until lever 28 starts to return to vertical position. At this time, because spring 18 is anchored to escapement pawl 10 from a ground on plate 34, it forces pawl 10 into the next tooth on rack 14. Now, spring 16 is stretched between pivot 26 and spring anchor 36 on pawl carrier 20. The geometry of the mechanism along with the shape of the teeth on pawls 10, 12 and the shape of the teeth on the rack 14 cause pawls 10 and 12 to stay in rack 14. Plate 34, which carries all of the selection mechanism, is grounded to the print carrier, which slides on rack 14. When we move lever 38 to the right, this pulls pawl 12 out of rack 14, causing plate 34 (carrier) to move to the left. Its motion is limited because the pawl carr...