Needle position detector

Details Needle position detector Needle position detector

D - Textiles, Paper

05

B

340/136.1

D05B 69/24 (2006.01) D05B 69/28 (2006.01)

Patent

CA 1183923

- 17 - TITLE OF THE INVENTION NEEDLE POSITION DETECTOR ABSTRACT OF THE DISCLOSURE A needle position detector for a sewing machine includes a pair of disk-like members axially mounted on a rotary shaft coupled to the armshaft of the sewing machine. Each of the disk-like members is provided with an optically nonreflective portion occupying a greater area of its circumference and an optically reflective portion occupying a smaller area of the circumference. The disk-like members are adjusted so that the angular positions of the respective reflective portions correspond to the upper and lower needle positions. A light emitting element is associated with each of the disk-like members to emit light in a radial direction thereto. A light sensitive element is also associated with each disk-like member to receive light reflected from the reflective portion of the associated disk-like member to generate a needle position signal. - 17 -

392695

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