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Brother International CB3-B917 Service Manual - Page 10

Needle bar mechanism, 5. Looper mechanism

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Page 10 highlights

1-4. Needle bar mechanism 1. MECHANICAL DESCRIPTIONS Needle bar clamp Needle bar Needle Needle bar clamp connector 5. Rocking motion 6. Vertical motion Needle bar drive lever 4. Rocking motion 3. Vertical motion Crank rod Stop cam 1. Rotation 2. Eccentric 111s Pulley 1-5. Looper mechanism Lower shaft Lower shaft helical gear Triangular cam Looper (Rotary) Loop spreader Drive shaft Helical gear Drive shaft 112s 113s Loop spreader base Loop spreader groove 115s cam Loop spreader guide 114s Triangular cam CB3-B916A/B917A 4

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