Beisler 1220-4 - Manual (Page 59)

Chapter 6: Operation
Page 6-35
8. Bring stops (4) and (5) in contact with the knife and tighten
screws (1) and (3).
9. Bring the knife into its highest position and loosen screw
(6).
10. Push the bottom knife attachment (7) to the left and let it
spring at the upper knife.
11. Tighten screw (6).
6.5.11 Bottom knife
Pict. 36 Bottom knife
The blade of the bottom knife should stand levelled with the upper
edge of the stitch plate.
1. Swing out sewing foot and cloth plate.
2. Loosen screw (1).
3. Push bottom knife attachment (2) to the left until the stop
and fix screw (1) a little.
4. Loosen screw (3) and remove the old knife.