Thread trim
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 55
14.3 Setting the short thread trimming
Obr. 45: Setting the short thread trimming
Proper setting
1. Minimum distance (point A) should be kept between the moving
knife (7) upper edge and the throat plate (8). At the same time the knife
motion must be free.
2. The fixed knife (5) and the moving knife (7) should be mutually set to
cut threads with minimum cutting pressure.
3. If the roller (10) is in contact with the cutoff curve (9) highest point
( p. 56), the distance (B) between the moving knife (7) and the throat
plate (8) should be zero.
1. Open the hook cover.
2. With the fitted on throat plate loosen screws (1), (2), (3) and shift the
knife holder downwards.
3. Slightly tighten screw (2), which fits the thread trim shaft surface.
4. Tighten the slide screw (3) until instruction 1 is accomplished.
5. Tighten the screw (2) and subsequently also the screw (1).
6. Dismantle the throat plate (8).
7. Screw on a fixed knife support (6) so that there is no clearance between
the knife (7) and the support (6) and support does not lift up knife.
8. Screw on the fixed knife (5) with two screws (4) and adjust as
instruction 2.
9. Fit the throat plate (8).
10. Loosen the clamp joint screw (12) on the roller (10) lever.
11. Push the moving knife (7) and the lever (13) to the end position on the
throat plate as instruction 3.
12. Tighten the clamp joint screw (12) on the roller (10) lever.
(1) - Screw
(2) - Screw
(3) - Screw
(4) - Screws
(5) - Fixed knife
(6) - Fixed knife support
(7) - Moving knife
(8) - Throat plate
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