Setting the safety snap-on coupling
Service Manual 867 Version 02.0 - 04/2015 85
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
Proper 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 ( 3.3.1 Access to the machine bottom section,
page 12)
Fig. 68: Attaching the safety snap-on coupling
Setting steps
1. Turn the left adjusting ring (2) such that the setscrews (1) are parallel
to one another.
The coupling engages.
WARNING
Risk of injury
Crushing injuries from moving parts.
Switch off the sewing machine before you reattach
the safety snap-on coupling after the thread has
jammed.
3
2
4
5
6
7
1
(1) - Setscrews
(2) - Left-hand adjusting ring
(3) - Safety snap-on coupling
(4) - Right-hand adjusting ring
(5) - Setting slot
(6) - Marking point
(7) - Coupling screw
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