Reducing Speed - Pfaff 3117 Instruction Manual

14

Reducing speed

.27
Requirement
1. With the sensing lever touching the reduction lug 2 the switch S20 must be pressed
securely.
2. The speed must be reduced approx. five stitches before the triggering of the knife
movement.
1
Fig. 14 - 57
Bring the machine into the right buttonhole seam position.
Engage the stop motion device.
Turn the handwheel until switch S20 just on.
Loosen screws 3 and move the switch blade 4 in accordance with requirement 1.
Tighten screws 3.
Turn the drive pulley in its direction of rotation until the first final bartack stitch while
counting the stitches.
Loosen screws 1 and move the reduction lug 2 in accordance with requirement 2.
Tighten screws 1.
Disengage the stop motion device.
2
4
3
S20
Adjustment
14 - 59