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United States of America Patent
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Feb 27, 2018
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N/A
app pub date -
Sep 29, 2016
filing date -
Apr 1, 2014
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Abstract
Whether a bright state or a dark state is established is determined each time a motor is driven one step, based on a presence or absence of a passing of light through a detection hole disposed in a detection wheel that rotates associated with rotations of a hand wheel coupled with the motor. A switching position X is identified at which the dark state is switched to the bright state when the dark state is determined and thereafter the bright state is determined. A position one step after the identified switching position X is set to be a reference position X+1 of the hand wheel. The reference positions X+1 and X−1 can thereby be set after a driving mechanism is assembled.
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