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18 Setting the safety snap-on coupling
The safety snap-on coupling disengages in the event of the thread jam-
ming and thus prevents the hook from being misadjusted or damaged.
18.1 Attaching the safety snap-on coupling
Correct setting
The four setscrews (1) on the two adjusting rings next to the safety snap-
on coupling (3) must be parallel to one another. After the coupling has dis-
engaged, they are no longer parallel.
Cover
• Tilt the upper section backwards
Figure 64: Attaching the safety snap-on coupling
Setting steps
1. Turn the left adjusting ring (2) such that the setscrews (1) on both adjust-
78
WARNING
Risk of crushing
Switch off the sewing machine before you reattach the safety
snap-on coupling after the thread has jammed.
(
Section 4.4.1 Access to the machine bottom section, page 10)
(1) - Adjusting ring setscrews
(2) - Left adjusting ring
(3) - Safety snap-on coupling
(4) - Right adjusting ring
ing rings are parallel to one another.
The coupling engages.
Setting the safety snap-on coupling
(5) - Setting slot
(6) - Marking point
(7) - Coupling screw
Service manual H867 Version 00.0 - 08/2013
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