Shutter mechanism including stepping motor control apparatus...

Details Shutter mechanism including stepping motor control apparatus... Shutter mechanism including stepping motor control apparatus...

2006-02-28

2006-02-28

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S685000, C318S671000, C318S808000, C318S811000, C318S265000, C318S266000

Reexamination Certificate

active

07005824

ABSTRACT:
A shutter mechanism includes a drum (2), a stepping motor (5), a driver (20), a microcomputer (10), a memory (16), and a load magnitude detection circuit (30) that detects the magnitude of the load on the stepping motor (5) when an object such as a shutter (3) is either wound or unwound from the drum (2). The microcomputer (10) can set the upper and lower limit stopping positions of the shutter (3) by resetting the number of command pulses stored in the memory (16) when the load magnitude detection circuit (30) detects an increase in the load at the stepping motor (5), and storing the number of command pulses output to that point from the memory (16) when the load magnitude detection circuit (30) next detects an increase in the load at the stepping motor (5) after the outputting of the command pulses is next restarted.

REFERENCES:
patent: 4902953 (1990-02-01), Kraft et al.
patent: 5038087 (1991-08-01), Archer et al.
patent: 5467808 (1995-11-01), Bell
patent: 5751128 (1998-05-01), Chalupa et al.
patent: 5850131 (1998-12-01), Wolfer et al.
patent: 6060852 (2000-05-01), Domel et al.
patent: 2313499 (1997-11-01), None
patent: A-2000-60185 (2000-02-01), None
patent: WO 02/06622 (2002-01-01), None

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