Browse Prior Art Database

Shaft Positioning Mechanism

IP.com Disclosure Number: IPCOM000095940D
Original Publication Date: 1964-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Owen, CE: AUTHOR

Abstract

The position of a shaft is set according to a coded input by a number of detenting levers bearing on cam tracks rotating with the shaft. The shaft is continuously trying to rotate but is held in the selected position by the levers which drop into slots in the cam tracks to stop the shaft. When the input code is altered, the selection of levers is changed and the shaft rotates to a new position.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 70% of the total text.

Page 1 of 2

Shaft Positioning Mechanism

The position of a shaft is set according to a coded input by a number of detenting levers bearing on cam tracks rotating with the shaft. The shaft is continuously trying to rotate but is held in the selected position by the levers which drop into slots in the cam tracks to stop the shaft. When the input code is altered, the selection of levers is changed and the shaft rotates to a new position.

In drawing A, eight levers 1 are carried on a rocking frame consisting of lever bearing shaft 2, side members 3 and frame bearing shaft 4. The cam tracks, on which the detent end of levers 8 bears, are shown in developed view in B.

A torque T is applied to the frame by means of a spring, not shown, to bias the detent ends of the levers against the cam tracks. A stop 5, one for each lever, takes up one of two positions according to the input code. A selected lever has its stop in the upper position. The movement of the stops is such that, if a selected lever has its detent end in a slot or trough of the cam track, then an unselected lever has its detent end just clear of a high part of the cam. If a selected lever is on a high part of its cam, then the whole frame is lifted and none of the levers can drop into a trough.

In operation, the eight levers are considered as four pairs Ao and Ai, Bo and Bi, etc., and one lever from each pair is selected according to the input code. The other lever remains unselected. The shaft is rotated until all the l...