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4.9.6 Setting the control cam for the thread advancing device
Fig. 55: Setting the control cam for the thread advancing device
(1) - Control cam
Proper setting
The thread advancing device is in its idle position when at the position
"thread lever at top dead center". When the machine is at the position
"thread lever at top dead center" the control cam (1) is at its highest point.
The thread advancing device captures the hook thread, but not the needle
thread. If there are any short pieces of thread in the area of the hook that
have been burnt off on both sides, the thread advancing device will cap-
ture the needle thread as well. In this case, the control cam will have to be
corrected to allow the thread advancing device to swing out with a delay.
Setting steps
1. Press the hand crank and turn it to the position "thread lever at top
2. Loosen the setscrews (2).
3. Rotate the control cam (1).
4. Tighten the setscrews (2).
58
WARNING
Risk of injury!
Risk of crushing injuries and stab wounds from
sharp and moving parts.
Switch off the machine before checking and setting
the idle position.
①
②
dead center".
(2) - Setscrews
Service Instructions 911-211 - 00.0 - 02/2015
Machine head
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