| 摘要 |
<p>A sewing machine (100) having a needle bar (120,122) and feed means (131,132,602,603) in which actuators (124,130) adjust the transverse position of the needle bar (120,122) and the positional displacement of the feed means (131,132,602,603) in response to control signals provided thereto, and a rotatable main shaft (104,204,205) operatively connected to the needle bar (120,122) for enabling transverse oscillation thereof which shaft (104) is driven by a main motor (201), includes an arrangement for generating synchronizing timing control signals to the actuators (124,130) and a stop control signal to the motor (201) to stop the shaft (104,204,205) in a predetermined arc of rotation in which a common magnet (208,508) mounted in a holder (207,507) for rotation with the shaft (104,204,205) interacts with a pair of spaced apart magnistors (211,213) to provide the timing control signals to the actuators (124,130) and a separate magnet means which may be either a single magnet (509) or a pair of spaced apart magnets (209,210 ), also mounted in the holder (207,507) interacts with a separate magnistor (212) to provide the stop control signal. The magnistors (211,212,213) are linearly arranged on a printed circuit board (313) forming part of the machine circuitry. A soft iron loop (601) may be provided to surround the area of such interaction so as to close the magnetic path and increase the associated flux density and minimize losses.</p> |
