Setting the bobbin case lifter
Service Instructions 867-M PREMIUM - 03.0 - 05/2017 55
Important
Ensure that the gap is not too big. The middle part of the hook must not
swing back and forth, hitting the slot in the throat plate (2).
7. Tighten the threaded pin (3).
8. Push the cover (4) upwards.
9. Tighten the screw (5).
11.2 Setting the timing for lifting
Fig. 42: Setting the timing for lifting
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 (4) is exactly in the middle of the open-
ing. (Insert hex key in the threaded pin for orientation).
To set the timing for lifting:
1. Tilt the machine head ( p. 16).
2. Remove the plug (1) on the bottom side of the hook housing (2).
3. Loosen the control cam threaded pin (4) through the opening.
4. Turn the handwheel until the hook tip is exactly below the bobbin case
lifter.
5. Use the hex 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.
8. Perform a sewing test.
(1) - Plug
(2) - Hook housing
(3) - Control cam
(4) - Threaded pin
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