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Dog Clutch without Backcheck Mechanism

IP.com Disclosure Number: IPCOM000052568D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Eskew: AUTHOR

Abstract

The backchecking of dog clutches requires space and parts which may be in conflict with space limitations in typewriters. This clutching arrangement and cam/follower combination eliminates the need for complex backchecking assemblies. Dog clutches may be backchecked without the addition of a backcheck pawl and ratchet. When keylever 10 is depressed, latch 12 is rotated by means of link 14 which releases clutch ring 16 by a means that will be described below in more detail.

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Dog Clutch without Backcheck Mechanism

The backchecking of dog clutches requires space and parts which may be in conflict with space limitations in typewriters. This clutching arrangement and cam/follower combination eliminates the need for complex backchecking assemblies. Dog clutches may be backchecked without the addition of a backcheck pawl and ratchet. When keylever 10 is depressed, latch 12 is rotated by means of link 14 which releases clutch ring 16 by a means that will be described below in more detail.

Clutch ring 16 is biased counterclockwise by spring 18 such that, when released, the clutch ring 16 rotates and forces pawl 20 to rotate counterclockwise about a stud 22 on cam 24 by means of a stud 26 in pawl 20 that slides along a slot 28 in clutch ring 16.

As stud 26 reaches the end of slot 28, pawl 20 engages ratchet 30 which is power driven and constantly rotating counterclockwise. Cam 24 is then driven a full revolution by means of the pawl 20 engaged in the ratchet 30 that is attached to the cam 24 by stud 22.

The rotation of cam 24 counterclockwise causes cam follower 32 to rotate clockwise, thus giving output motion through link 34, as may be used for any suitable purpose.

As clutch ring 16 completes one revolution, it restores upon latch 12, and cam 24 continues to rotate until the stud 26 in pawl 20 reaches the end of slot 28 at which point pawl 20 is disengaged with ratchet 30. At this point, spring 18, which is attached between stud 36 on cam...