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4.
TIMING OF NEEDLE AND ROTARY HOOK (CLEARANCE BETWEEN THE
NEEDLE AND THE ROTARY HOOK POINT)
STANDARD
When the machine is in test mode and is selected, and the needle is raised 2.9 to 3.3 mm from its lowest
position, the rotary hook point should be aligned with the outer circumference of the needle. The clearance between
the needle (golden needle) and the rotary hook point should be 0.1 mm or less, and they should never touch each
other .
ADJUSTMENT
1.
Put the machine in test mode and select pattern .
2.
Loosen the three screws of the lower shaft gear.
3.
Adjust the clearance between the needle and the rotary hook. (When the needle is raised 2.9-3.3 mm from its
lowest position, the rotary hook point should be positioned at the right side of the needle.)
4.
Tighten the three screws of the lower shaft gear.
5.
Turn the adjusting screw, and set the clearance between the needle and the rotary hook point to 0.1 mm or
less. Make sure that the needle does not make contact with the rotary hook point.
Summary of Contents for BL7800
Page 1: ...4 2001...
Page 4: ...2 1 MECHANICAL CHART...
Page 9: ...7 1 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS 8 2 LEAD WIRE ARRANGEMENT 19...
Page 15: ...13...
Page 17: ...15...
Page 19: ...17...
Page 21: ...19 2 LEAD WIRE ARRANGEMENT...
Page 43: ...41 Main PC board...
Page 44: ...42 Power supply unit Power 120 Power 230...
Page 45: ...43 Operation board Other PC boards...
Page 46: ...BL7800 T1010141...