Pfaff 3811-11/43, Instruction Manual

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31 Quick adjustment of the differential for altering the gathering
intensity
31.1 Zeroing the differential quick adjustment
31.1.1 Rough adjustment at the angle encoder 1
(fig. 2)
Requirement:
After pressing the key:
- the actuating lever 2 should be at “0” on the control cam scale, and
- the sewing machine should sew smoothly (without fullness).
.1 Switch off the machine (mains switch).
.2 Remove the protective cover 1 from the angle encoder.
.3 Loosen the retaining screw of the angle encoder a little.
.4 Turn the machine on (mains switch): the key is activated automatically (LED on).
On the -2/45 the key must be activated manually.
.5 Set the stitch length at 4 mm.
.6 Attach the connecting rod 4 (fig. 3).
.7 Loosen screw 3 (fig. 2).
.8 Turn the angle encoder 1 (fig. 2) until the roller on the actuating lever 2 is at the “0” on the scale.
.9 In this position, tighten the retaining nut on the angle encoder.
.10 Place the roller of the actuating lever 2 against the control cam and tighten the screw 3 (fig. 3).
.11 Remove the connecting rod 4.
.12 - Carry out a control (see requirement)
- Screw the protective cover back on the angle encoder
- Mount the cover plate.
31.1.2 Fine adjustment at the Poti “0”
(fig.4)
Requirement:
When the key is activated (LED on), the machine should sew smoothly
(without fullness).
.1 Test seam
.2 If necessary, adjustment at the Poti “0”.
.3 To carry out the fine adjustment the connecting rod 4 must be attached again.
Note: The default setting of the Poti “0” (fig. 4) is the position “0” and as a rule it should not be
altered or altered very little (for altering the rough adjustment)!
Nevertheless, if the Poti “0” should be altered strongly, a rough adjustment of the
basic setting (“0” position of the Poti) can be made as follows:
- Turn Poti “0” 20 rotations to the left (direction -).