Thread Clipper; Control Cam For Timing The Blade Movement - Duerkopp Adler 271 Service Manual

8. Thread clipper

8.1 Control cam for timing the blade movement

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The control cam 4 determines the movement of the thread clippers and
the timing of the blade movement. The timing thus coincides with the
movement of the stitch-forming components.
The thread clipper is switched on electromagnetically.
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4
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Regulation and inspection
When the thread clipper is not in operation there must be a distance of
0.2 to 0.3 mm between the external diameter of the control cam 4 and
the ball-race 6.
With the machine locked in position D ball-race 6 must engage in the
indentation 5 of the control cam 4 when manually pressed downwards.
Caution: danger of injury
Turn off the main switch.
The control cam may only be adjusted with the sewing machine
switched off.
Adjustment
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Undo fastening screws 7 of the magnet 1.
–
Move magnet 1.
The distance between control cam 4 and the ball-race 6 must be
0.2 - 0.3 mm.
The roller 3 must be in contact with the ram 2.
–
Retighten fastening screws 7 of the magnet 1.
–
Lock sewing machine in position D.
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Undo fastening screws of the control cam 4.
–
Turn the control cam on the lower shaft.
The ball-race 6 must engage in the indentation 5 of the control cam
4 when manually pressed downwards.
The axial position should be such that the control cam 4 and roller
6 are opposite each other.
–
Retighten fastening screws of the control cam 4.
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