Setting the cloth retainers for classes 251, 261, 271, 281, 252, 352
(lowering over cross seams)
For setting the cloth retainers, the cloth is inserted in the machine as for sewing (not
on the cross seam).
Cloth retainer A (the left-hand cloth retainer on classes 251,261,271 and 252/352) is
adjusted with the knurled screw B such that - with a single layer of cloth (when the
needle pierces the cloth) – the shoe can still move slightly if you press your finger on
the knurled screw.
The right-hand cloth retainer on class 252/352 is adjusted in the same way, but with a
triple layer of cloth (folded in an "S" shape).
When sewing over the cross seam, the cloth retainers press the plunger (rib shaft)
down, so that, with the correct setting, only the cloth tuck of the cross seam is
pierced.
If the outside cloth layer is pierced in the area of the cross seam (thread pulls on the
outside of the hem), the cloth retainer clearance must be reduced (turn the knurled
screw clockwise).
If, on the other hand, the top layer of cloth (cloth tuck) is not pierced, the cloth
retainer clearance must be increased (turn knurled screw anticlockwise).
During sewing, the cloth retainers must move up and down alternately.
Important:
The plunger and cloth retainer are interdependent during adjustment, so the cloth retainer
may need readjusting after adjusting the plunger (rib shaft).
Setting the helical spring
The plunger (rib shaft) must spring downwards when sewing over cross seams.
The strength of the spring force can be adjusted with the knurled nut.
Hard cloths need a harder setting, softer cloths need a softer setting.
Fig. 4 = helical spring for plunger (rib shaft) or left-hand plunger on classes
252/352
Fig. 4 = helical spring for plunger (rib shaft) or right-hand plunger on classes
252/352
To Next Page
Loading...
