Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1996-02-08
1997-04-29
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
25055933, 269 73, 901 47, G01N 2186
Patent
active
056251980
ABSTRACT:
A positioning apparatus performs positioning of a second movable member relative to a first stationary member in respect of two (X and Y) directions perpendicular to each other. A first optical sensor detects a predetermined position of the second member relative to the first member in respect of the X direction. The first optical sensor has a light projector and a light receiver separately arranged on the first and second members such that they are opposed to each other in the Y direction, when the second member is in the predetermined position in respect of the X direction. A second optical sensor detects a predetermined position of the second member relative to the first member in respect of the Y direction. The second optical sensor has a light projector and a light receiver separately arranged on the first and second members such that they are opposed to each other in the X direction, when the second member is in the predetermined position in respect of the Y direction. An X-direction moving mechanism moves the second member in the X direction. A Y-direction moving mechanism moves the second member in the Y direction. A controller stops a moving operation of the X-direction moving mechanism based on a detection signal from the first optical sensor, and stops a moving operation of the Y-direction moving mechanism based on a detection signal from the second optical sensor.
REFERENCES:
patent: 3037420 (1962-06-01), Stade
patent: 4523100 (1985-06-01), Payne
patent: 4602163 (1986-07-01), Pryor
patent: 5063334 (1991-11-01), Tanita et al.
patent: 5279178 (1994-01-01), Yanagisawa
Allen Stephone
Sanyo Electric Co,. Ltd.
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