−
91
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Trouble
Cause (1)
Cause (2)
Checking order and adjusting procedure
Page
6. Presser fails to work. (Presser fails
to go up.)
7. Sewing machine fails to run at high
speed even when depressing the
starting pedal. (2-pedal system)
6-1)
Bobbin thread trimmer driving
arm fails to work.
6-2)
Starting safety arm fails to
return and comes in contact
with presser lifting lever.
6-3)
C
learance provided between
starting safety arm presser
lifting lever is too small.
6-4)
Position of needle thread
trimmer is improper.
6-5)
Mismatch of slide roller bracket
and needle thread trimmer
crank (front) (When the needle
thread trimmer is in the most
advanced position.)
7-1)
Starting safety hook does not
engage with starting safety
lever.
1)-A
Throat plate, throat plate base,
and bobbin thread trimmer are
clogged with foreign matters
such as lint or the like.
1)-B
Bobbin thread trimmer
interferes with bobbin thread
trimmer ball screw.
1)-C
Inner hook stopper comes in
contact with bobbin thread
puller.
4)-A
When needle thread trimmer is
removed and the presser lightly
works, it is supposed that the
trimmer interferes with other
parts.
1)-A
Starting sensor plate comes in
contact with starting sensor.
1)-B
Needle thread trimmer control
lever is excessively pressed to
needle thread trimmer crank,
rear.
Remove the work clamp carrier and clean around the throat plate.
Adjust the length of bobbin thread trimmer ball screw.
Adjust the inner hook stopper.
Remove interference of the components related to the starting safety
arm.
Refer to the item (13) of STANDARD ADJUSTMENT.
(Position of the starting safety arm)
Refer to the items (19), (20) and (21) of STANDARD ADJUSTMENT.
(Adjusting the position of the needle thread trimmer)
Re-adjust the slide roller bracket. (Rotating direction)
Refer to the item (28) of STANDARD ADJUSTMENT.
Advancing amount of the needle thread trimmer is too large.
Refer to the item (19) of STANDARD ADJUSTMENT.
Adjust the installing position of the starting sensor.
Adjust the position of the needle thread trimmer control lever.
(See page 16.)
(See pages 22 to 25.)
(See page 32.)
(See page 22.)
(See page 18.)
(See page 20.)
Summary of Contents for LBH-1700
Page 1: ...R ENGINEER S MANUAL 29339504 No 04 Electronic Buttonholing Machine LBH 1700 Series ...
Page 55: ... 51 MEMO ...
Page 124: ... 120 ...
