# US 7,671,554 B2 · Motor driving system

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- Number: US 7,671,554 B2
- Document ID: US7671554B2
- Status: Granted
- Kind: B2
- Application number: 11/958,987
- Filed: 2007-12-18
- Published: 2009-04-30
- Granted: 2010-03-02
- Earliest claimed: 2007-10-26
- Assignees: Primax Electronics Ltd.
- Inventors: Chia-Chang Lin; Chih-Hsun Lin
- Web page: https://patentgrep.com/patent/US7671554B2

## CPC

- G05B 19/19: characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
- G05B 2219/37415: By cutting light beam
- G05B 2219/50133: With optical beam, tool crosses beam
- Y10S 388/937: Hand tool
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

The present invention relates to a motor driving system. The motor driving system includes a motor, a transmission member, a follower member, a position-detecting light emitter, a position-detecting light receiver, and a positioning-status sensing element. The positioning-status sensing element includes a plurality of notches or openings. The positioning-status sensing element is moved between the position-detecting light emitter and the position-detecting light receiver such that a light beam emitted from the position-detecting light emitter is successively penetrated through the notches or openings to be received by the position-detecting light receiver. According to the light-receiving status of the position-detecting light receiver, the speed of the motor is reduced.

## Claims

### Claim 1

A motor driving system for controlling movement of a follower member, said motor driving system comprising:
a motor for providing a working mechanical energy E required to control movement of said follower member;
a transmission member coupled to said motor and said follower member and driven by said motor to transmit said follower member to move;
a position-detecting light emitter and a return light emitter for generating a first light beam and a second light beam, respectively;
a position-detecting light receiver and a return light receiver for receiving said first light beam and said second light beam, respectively; and
a positioning-status sensing element disposed on said transmission member and including a front end, a rear end and a plurality of notches or openings between said first end and said rear end, said positioning-status sensing element being moved between said position-detecting light emitter and said position-detecting light receiver such that a light beam emitted from said position-detecting light emitter is successively penetrated through said notches or openings to be received by said position-detecting light receiver, wherein said working mechanical energy E provided by said motor is decreased to a first mechanical energy E1 so as to reduce the speed of said transmission member when the notch or opening nearest to said front end of said positioning-status sensing element enters the region between said position-detecting light emitter and said position-detecting light receiver, and said working mechanical energy E provided by said motor is decreased to a final mechanical energy En when the notch or opening nearest to said rear end of said positioning-status sensing element enters the region between said position-detecting light emitter and said position-detecting light receiver, where said first mechanical energy E1 is greater than said final mechanical energy En.

### Claim 2 (depends on 1)

The motor driving system according to claim 1 wherein said motor is a universal motor, a DC motor, a synchronous motor or an induction motor.

### Claim 3 (depends on 1)

The motor driving system according to claim 1 wherein said follower member is a punching knife.