Browse Prior Art Database

LOW-COST CONTACT ENCODER

IP.com Disclosure Number: IPCOM000026673D
Original Publication Date: 1993-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 55K

Publishing Venue

Xerox Disclosure Journal

Abstract

A low-cost contact encoder for measuring the linear or rotational speed of a member, incorporates a body of piezoelectric material which is repeatedly stressed and relieved by movement of the body of which the movement is being monitored.

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 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

LOW-COST CONTACT ENCODER
Proposed W. Wafler Classification

U.S. C1.073/002

Int. c1. Golc 17/38

WI

8 P

OUTPUT

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 2 MarcWAprill993 123

[This page contains 1 picture or other non-text object]

Page 2 of 2

LOW-COST CONTACT ENCODER (Cont'd)

A low-cost contact encoder for measuring the linear or rotational speed of a member, incorporates a body of piezoelectric material which is repeatedly stressed and relieved by movement of the body of which the movement is being monitored.

As shown in the drawing, the piezoelectric body 2 may be in the form of an arm cantilevered from a support 4 of insulation material. The outer end of the arm
2 is in the path of a multi-lobed cam 6 which may be rotary or linear. As each lobe flexes the arm 2 and then allows it to return to its straight position, the arm 2 generates a series of successive pulses of electrical charge. These are fed to an associated logic circuit 8 which shapes them into any desired output signal, which can be used or calibrated to give the desired reading of speed of the body to which the cam 6 is secured or geared.

124 XEROX DISCLOSURE JOURNAL - Vol. 18, No. 2 MarcWApril 1993

[This page contains 1 picture or other non-text object]