68 PFAFF
53 Differential quick adjusting device for altering the fullness
53.1 Zeroing the rapid differential adjustment
53.1.1 Rough adjustment on the angle encoder
Requirement: When key (fig. 1) is activated, pointer 1 (fig. 2) should be in the zero
position (5th graduation, fig. 3)
Note: Connecting rod 2 (fig. 2) must be mounted.
.1 Switch off the machine (master switch).
.2 Screw off cover plate (above differential quick adjusting device).
.3 Screw off protective covering of the angle encoder 3.
.4 Loosen screw 4 a bit.
.5 Switch on machine (master switch) - key is automatically activated (LED on).
Note: Make sure not to trap your fingers when making the following adjustments
(see arrow in fig. 2)
.6 Turn the angle encoder 3 until pointer 1 is in the zero position = 5th graduation from the
bottom of the scale (fig. 3).
.7 Tighten up nut 4 in this position.
.8 - Check (see requirement).
- Screw on the protective cover of the angle encoder.
- Mount cover plate.
53.1.2 Precise adjustment on pot “0”
Requirement: When key is activated (LED on) the machine should sew without ply
shift (without fullness).
.1 Test seam.
.2 If necessary readjust pot “0”
Note: The pot “0” (fig. 4) has been set to the “0” position at the factory and should generally not
be adjusted or just a little (to correct the rough setting)!
If however the pot “0” should ever be very wrongly adjusted, the basic setting (“0”
position of the pot) can be roughly readjusted as follows:
- Turn pot “0” 20 times to the left (direction -)
- Turn pot “0” 14 times to the right (direction +)
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