11.15 Trimming and Clamping Device for the Underthreads
Function
–
After the seam end and during the pulling forward of the thread the
underthreads are pulled through the thread grooves in the needle
plate into the opened underthread shears 1 and underthread
clamp 2.
–
The underthread clamp 2 is under the needle plate.
It opens pneumatically.
–
The underthreads are pulled between the needle plate wall and the
opened spring clamping plates 5.
–
The spring clamping plates 5 close.
–
The underthread shears 1 cut the underthreads.
–
With every work cycle the underthread shears 1 are cleaned by a
jet of air.
This prevents the clamping in of lint and thread ends.
Setting
The upper edge of the underthread shears 1 must lie at the same
height as the top of the needle plate.
Underthread shears lying too high can cause damage to the material.
With the underthread shears lying too low the underthreads are not cut.
The limiter plates 4 mounted on cylinder 3 determine the opening
width of the spring clamping plates.
With pneumatically opened spring clamping plates 5 both hook points
must move past at a safe distance.
1
2
3 4 5
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