Singer 601 - Trimmer Adjustments and Thread Control; Adjusting the Trimmer Knife; Sharpening the Stationary Knife; Adjusting Thread Tensions

All sensors are correctly timed
disturbed and retiming or resetting
and set before le.oing the factory. If. however, this timing or setting has been
becomes necessan . adjust by correctly positioning the sensor plates.
, The positions of the settso, plates (to, oppe, an,I lower needle posit,o„s and fo, controlling the tttntnte, solenoid)
- ebtlot, l„ the sense, se, screw A should he as shown m Fig. 66. To adjust the post,,on ol a sens,,, plate,
loosen screw on right end of the sensor and turn sensor plate as required, then tighten the screw.
t position sensor on hub of machine pulley so that its second set screw (set screw which appears immediately a er
" th e first set screw when sensor is rotated over toward the operator) is aligned with the second set screw of le
machine pulley and firmly tighten the two set screws. (See Fig. 67)
MACHINE PULLEY
Fig. 67