Brother International CB3-B917 Service Manual - Page 46

5-24.Button clamp opener (B917A) Button clamp lifter lever Roller Contact Adjustment plate Button clamp opener claw B 51702s Button clamp open lever 5. ADJUSTMENT 1. When the pulley is turned and, at the final stitch, the Button clamp lifter lever and the roller contact, adjust the adjustment plate so that the button clamp opener claw B contacts the button clamp open lever at the same time. 2. In the above condition, adjust the button clamp opener claw B so that the clearance of the button clamp opener claw B and of the button clamp open lever is 0 - 1 mm. Button clamp opener claw B 517s Button clamp open lever 0 - 1 mm 5-25.Thread take-up lever Thread take-up lever Less 518s More Cotton thread Synthetic thread Adjust the thread take-up lever position according to the thread used. Cotton thread With the machine in the stop position, set the bottom of the thread take-up lever to the top reference line. Synthetic thread With the machine in the stop position, set the bottom of the thread take-up lever to the bottom reference line. 5-26.Main tension Decrease Main tension control nut Increase Turn the main tension control nut to adjust the thread tension. B916A If, after attaching the button, long threads remain hanging from the back side of the material, adjust the main tension for stronger tension. 519s CB3-B916A/B917A 40