Bobbin Thread Trapper Spring - Pfaff 900/56 Service Manual

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Bobbin thread trapper spring

Requirement
Thread trapper spring 4 must not be deflected during the catcher motion. After thread
trimming, the bobbin thread must be trapped reliably. The bobbin case must be easy to
remove from the sewing hook and easy to remove.
3
2
Making sure catcher 1 is in starting position, loosen screws 2 slightly.
Maintain position and adjust position of bracket 3 so that lip of trapper spring 4 is set as
close as possible to inner wall of thread catcher 1 and is flush with front edge of catcher
(see right Fig.).
In this position, tighten screws 2.
Adjust bracket 3 vertically so that there is a clearance of 0.1 mm between thread trapper
spring 4 and underside of thread catcher 1 (see lower left Fig.).
Check this adjustment according to the requirement.
On two-needle machines, make adjustment twice.
1
4
0.1 mm
1
Adjustment
2
4
3
1
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