Tension Release Adjustment - Brother b831 Service Manual

[H TENSION RELEASE ADJUSTMENT
Tension discs are closed
Approx. 0.5 mm
Tension discs are open
a
Greater than 0.8 mm
1. When the presser foot is raised with the presser bar lifter lever
1) Check the presser foot height. Refer to page 32.
2) Check that the thread tension disc O is open 0.8 mmwhen the presser foot is raised 7 mm with the presser bar lifter
lever O-
3) Turn the tension release lever O to adjust the tension disc gap O-
2. During thread cutting
1) The tension release crank O to presser bar lifter0 gap should be 1.5 mmwhen the tension release is not operating.
2) Loosen nut O- remove screw O- and adjust with the link ©.
1.5 mm
S Insufficient tenison disc gap
• The thread will be held too tightly and will not pass smoothly through the disc.
8i Excessive tension disc gap
• Improper stitch tightening
• Loose stitches will appear at the corners with thread cutter sewing machines.
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