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Noise Reduction in Escapement Mechanisms

IP.com Disclosure Number: IPCOM000096533D
Original Publication Date: 1963-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Glombitza, G: AUTHOR

Abstract

The arrangements are typewriter escapement mechanisms. The shock-absorbing parts are rubber-metal components including one or a plurality of elastic layers. This prevents not only propagation of the sound waves produced in the stepping movement but also their production. Such is by decreasing the vibratory masses absorbing the shock.

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Noise Reduction in Escapement Mechanisms

The arrangements are typewriter escapement mechanisms. The shock- absorbing parts are rubber-metal components including one or a plurality of elastic layers. This prevents not only propagation of the sound waves produced in the stepping movement but also their production. Such is by decreasing the vibratory masses absorbing the shock.

In the upper escapement, rack 2 attached to carriage 1 is in mesh with carriage drive gear 3. The latter is connected through clutch 4 to escapement wheel 5. Gear 3 and wheel 5 are mounted on shaft 6 which is journalled in baring 7. The teeth of wheel 5 are alternately engaged with the pawls of a rocking double pawl, one (8) of which is pivoted. Carriage 1 is advanced one step which is limited by pawl 8 encountering stop 9. For reducing impact, wheel 5 has an annular, shock and sound reducing intermediate layer 10. This consists of vulcanized rubber, of a plastic material or of a non-vibrating metal.

In the lower escapement, teeth of rack 11 are engaged by escapement pawl 12 operated by escapement lever 13. By means of slot 14, pawl 12 is mounted on pin 15. Below pawl 12, interposer 16 is mounted also on pin 15. The offset end 17 of interposer 16 is pulled by spring 18 toward one arm of lever 13. Rent nose 19 of interposer 16 acts on the end of pawl 12. When lever 13 is operated, pawl 12 is disengaged from rack 11. It flies to the right under the action of spring 20 and is at the same time ro...