Underthread Puller For The Cutting Procedure - Duerkopp Adler 558 Service Instructions Manual

42.5 Underthread Puller for the Cutting Procedure

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1
2
3
4
5
6
7
8
9
10
11
The pulling forward of the underthread is necessary so that the thread
seperator can bring enough loose underthread to the fixed knife. A
distortion of the sewn buttonhole is thus avoided.
After the sewing sequence is turned off and the turning movement of
the hook block begins the thread pull lever 3 is operated by the latch 6
and cam 11.
In order to have a sufficient amount of thread the thread pulling lever 3
must have moved to within about 2 mm of tie rod 4.
Latch 6 must thereby lie at the highest point of the cam 11.
In order to assure a flawless run of the cam onto the latch there must
be a clearance of about 34 mm between the housing 1 and the upper
edge of the fork 5.
Caution Risk of Injury !
Pull the mains plug before adjusting.
–
Loosen lock nut 2.
–
By turning the latch 6 in or out set a clearance of about 34 mm
between the housing 1 and the upper edge of the fork 5.
–
Tighten lock nut 2 again.
–
Turn the hand crank until the hook block enters the position shown.
In this position the latch 6 has run onto the highest point of the
cam 11.
–
Loosen clamping screw 10.
–
Turn the thread pulling lever 3 so that there is a clearance of about
2 mm to the tie rod 4.
–
Tighten clamping screw 10 again.
Torque = 3.3 Nm !
–
Loosen screw 8.
–
In the idle position of the thread pulling lever 3 set the release
plate 7 for the underthread tension at a small clearance to the
roller 9.
–
Tighten screw 8 again.