| 摘要 |
PROBLEM TO BE SOLVED: To achieve power-saving, sound suppression and the like in a shooting motor. SOLUTION: A stepping motor 4 makes one rotation through 200 steps. An exciting current switching timing signal K<SB>1</SB>is produced at the origin. An exciting current ratio is set to 20%. The torque of a cam 5 is set to a low value. An exciting current switching timing signal K<SB>2</SB>is produced at the time of an advance of 32 steps from the origin. The exciting current ratio is set to 100% (maximum). The torque of the cam 5 is set to a high value. The exciting current switching timing signal K<SB>3</SB>is produced at the time of the advance of 64 steps from the time of the production of the signal K<SB>2</SB>. The exciting current ratio is set to 50%. The torque of the cam 5 is set to an intermediate value. A return to the origin is executed after the advance of 104 steps from the time of the production of the signal K<SB>3</SB>. COPYRIGHT: (C)2009,JPO&INPIT
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