Browse Prior Art Database

Cam Position Detector Disk

IP.com Disclosure Number: IPCOM000050143D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Cahill, DP: AUTHOR [+2]

Abstract

It is necessary in different instances in a typewriter and other machine controls to know the position of a particular cam and when a cam reaches a particular predetermined position. This may readily be accomplished by mounting on one of the faces 10 of the structure 12 supporting the cam surface 14 a conductive pattern 16 designed to exhibit different combinations of conductivity at different rotational positions.

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Cam Position Detector Disk

It is necessary in different instances in a typewriter and other machine controls to know the position of a particular cam and when a cam reaches a particular predetermined position. This may readily be accomplished by mounting on one of the faces 10 of the structure 12 supporting the cam surface 14 a conductive pattern 16 designed to exhibit different combinations of conductivity at different rotational positions.

It is desirable to position the conductive pattern 16 such that it is slightly recessed to protect it during normal machine operation and, at the same time, insure that the pattern will rotate with the cam structure.

This can be accomplished by the formation of the conductive circuit pattern 18 on a flexible substrate material 20 and the addition of an adhesive to the mounting surface of the circuit substrate. With the flexible substrate adhesively attached to one of the plane radial surfaces 10 of the cam structure 12, the detector 22 may then be positioned approximate to the conductive surface 18 to detect the rotation of the cam 14, and by detecting the electrical continuity through the combination of the brushes 24, may determine the position of the cam 14 relative to some datum position.

The brushes 24 may also be fabricated from a flexible circuit member 26 and folded over to provide the rubbing electrical contact surface.

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