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Browse Prior Art Database

Electromechanical Left Hand Final Stop

IP.com Disclosure Number: IPCOM000084650D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Baker, HL: AUTHOR [+3]

Abstract

Printers utilizing a leadscrew 10 to drive a nut 12 along the axis of the leadscrew 10 can translate carrier 14 in response to the leadscrew rotation.

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Electromechanical Left Hand Final Stop

Printers utilizing a leadscrew 10 to drive a nut 12 along the axis of the leadscrew 10 can translate carrier 14 in response to the leadscrew rotation.

Attached to the leadscrew 10 is ratchet 16 and pawl 18 which controls the starting and the stopping of the leadscrew, in response to electrical signals generated by emitter wheel 20 and emitter 22. As emitter 20 rotates, it generates electrical pulses by exposing the photodiode in the emitter 22 to a light source. These signals are then used to determine the distance which has been travelled by nut 12 in response to the rotation of leadscrew 10.

Prior devices drove nut 12 or carrier 14 into a physical stop and thus halted the rotation of leadscrew 10. This would result in emitter wheel 20 ceasing to rotate and thus quit generating signals. The impacting of the nut 12 or carrier 14 into a frame stop was disadvantageous. Therefore, rotary stop member 24 is added to the leadscrew 10. Stop member 24 is pinned or otherwise rotationally fixed to the shaft. Carrier 14 carries in adjustable stop member which can take the form of an arm 26 supporting a threaded screw 28. Arm 26 merely supports threaded stop 28 such that the rotational arrangement between stop 24 and the leftmost margin point of carrier 14 may be finally adjusted.

A similar arrangement may be implemented at the right end of leadscrew 10 should it be desired to physically limit the travel to a predetermined point. One ad...