| 摘要 |
<p>1,156,420. Sewing machines. MEFINA S. A. 13 June, 1968 [6 July, 1967], No. 28079/68. Heading D1G. A sewing machine comprises a motor pivotally mounted in the machine frame, manually operable means enabling the motor to be tilted into any one of three positions, in the first position a motor drive wheel being disengaged from a handwheel and from a spoolwinding shaft, in the second position the drive wheel being drivingly engaged only with the handwheel, and in the third position the drive wheel being drivingly engaged only with the spool-winding shaft, and means for locking the handwheel in a predetermined position when the motor is in the first position. A motor 3 is pivotally mounted on a pair of fixed pins 6 within the hollow standard 2 of a sewing machine. plate 19, carried by motor 2, is formed with a cam follower finger (23) biased by a spring 28 into engagament with an axial cam 17 rigid with a knob 15 journalled in standard 2. In a second angular position of knob 15, follower (23) engages a recess 25 in cam 17, whereby motor 8 tilts to a position II in which a friction wheel 8 on the motor shaft drivingly engages a handwheel 7 on the arm shaft 41. In a third position of knob 15, follower (23) engages a lobe 26 of cam 17, whereby motor 8 tilts to a position III in which wheel 8 is disengaged from handwheel 7 and drivingly engages a wheel (12) on a vertical spool-winding shaft (9). A radial cam 18, rigid with knob 15, co-operates with a follower finger 32 on a lever 30 pivoted at 31 on the machine frame and biased by a spring 36 to engage finger 32 with cam 18. When knob 15 is turned to the second and third positions, finger 32 enters respective notches 39, 40 in cam 18. When knob 15 is turned to a first position, follower (23) engages a portion 27 of cam 17 and motor 3 assumes an upright position 1 in which wheel 8 is disengaged from wheels 7 and (12). The thread take-up lever of the machine is then in a withdrawn position, and a finger 34 on lever 30 enters a notch 35 in handwheel 7.</p> |
