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Brother International CB3-B917 Service Manual - Page 13

Thread trimmer mechanism

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1. MECHANICAL DESCRIPTIONS 1-7. Thread trimmer mechanism Connecting rod 4 Connecting lever Thread cutter connecting rod 2 6 5 7 Pawl Number of stitches adjustment cam Fixed knife Movable knife Cam shaft 123s 3 Thread trimming lever 1. Rotation Thread trimming lever Number of stitches adjustment lever Number of stitches 6, 8 124s Number of stitches adjustment cam Number of stitches 12, 16 125s Number of stitches 24, 32 126s Stitch 32 lever Roller Number of stitches adjustment gear 7 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