Bobbin case lifter
52 Service Instructions 827/827-M - 01.0 - 05/2019
11.2 Adjusting the timing for opening
Fig. 35: Adjusting the timing for opening
Proper setting
The bobbin case lifter starts to open exactly at the point when the hook tip
is located below the bobbin case lifter after the loop is taken up.
In 1-needle machines, this happens when the handwheel position is
approx. 100°.
In 2-needle machines, this happens when the handwheel position is
approx. 100° for the right-hand hook, and when the handwheel position is
approx. 300° for the left-hand hook.
For 100° or 300°, the threaded pin of the control cam (4) is exactly in the
middle of the opening. (Insert allen key in the threaded pin for orientation.)
To adjust the timing for opening:
1. Tilt the machine head ( p. 14).
2. Remove the plug (1) on the bottom side of the hook housing (2).
3. Loosen the threaded pin (4) through the opening.
4. Turn the handwheel until the hook tip is exactly below the bobbin case
lifter.
5. Use the allen key to turn the control cam (3) so that the bobbin case
lifter opens at the correct point in time.
6. Tighten the threaded pin (4).
7. Insert the plug (1) into the opening.
(1) - Plug
(2) - Hook housing
(3) - Control cam
(4) - Threaded pin
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