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Brother International CB3-B917 Service Manual - Page 15

Tension release mechanism

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1.MECHANICAL DESCRIPTIONS 1-8-3. Button clamp opener [B917A] Size adjustment plate Button clamp opener Claw adjustment plate Button clamp lever Button clamp opener claw Button clamp Button clamp plate cam opener lever 129s 130s Returns to original position 1-9. Tension release mechanism Thread tension (Tightens on final stitch only) Auxiliary tension (Opens at each stitch) Main tension (Thread tension is always kept.) Disconnects 131s Slider Rocking 132s Needle bar drive lever Slider Final stitch (B916A : non) During machine Machine stop operation 133s Machine stopped Sewing Final stitch B917A B916A Thread tension O O O -> X -> O O -> X -> X Auxiliary tension O Opens at each stitch Differs according to needle bar position Main tension X X X O-Tension discs open X-Tension discs close 9 CB3-B916A/B917A

Section	Page
Index	1
1. MECHANICAL DESCRIPTIONS	7
1-1. Start mechanism	7
1-2. Number of stitches changing	8
1-3. Brake mechanism	9
1-4. Needle bar mechanism	10
1-5. Looper mechanism	10
1-6. Feed mechanism	11
1-7. Thread trimmer mechanism	13
1-8. Button clamp mechanism	14
1-9. Tension release mechanism	15
2. DISASSEMBLY	16
2-1. Cover	16
2-2. Clutch	16
2-3. Button clamp lifter	17
2-4. Looper	18
2-5. Number of stitches changing	19
2-6. Needle bar	20
3. ASSEMBLY AND ADJUSTMENT	21
3-1. Needle bar	21
3-2. Number of stitches changing	23
3-3. Looper	25
3-4. Button clamp	30
3-5. Clutch	31
3-6. Cover	32
4. REPLACEMENT OF PARTS	34
4-1.Horizontal feed cam, vertical feed cam, worm gear, worm, number of stitches adjustment cam	34
4-2.Cushion rubber	39
4-3.Operating lever pawl	40
5. ADJUSTMENT	41
5-1.Needle bar height	41
5-2.Loop spreader	41
5-3.Point where needle and looper meet	41
5-4.Clearance between needle bar and looper	41
5-5.Needle guard	41
5-6.Fixed knife	41
5-7.Movable knife	42
5-8.Number of stitches control lever	42
5-9.Number of stitches adjustment cam	42
5-10.Pawl of thread trimming lever	42
5-11.Button clamp driving lever	42
5-12.Worm and worm gear backlash	43
5-13.Pulley clearance in thrust direction	43
5-14.Slider	43
5-15.Auxiliary tension timing	44
5-16.Thread tension timing	44
5-17.Loop spreader timing	44
5-18.Forward and reverse feed	44
5-19.Button clamp installation	45
5-20.Elevation amount of button clamp	45
5-21.Feed timing	45
5-22.Clutch lever	45
5-23.Braking force	45
5-24.Button clamp opener (B917A)	46
5-25.Thread take-up lever	46
5-26.Main tension	46
5-27.Rotor	47
5-28.Button clamp pressure	47