C
Ascending
Down
L
A
B
-11-
During the sewing, the center gauge (L) between
the walking foot sliding block and its shaft can be
adjusted according to the differences of the friction
coefficients of the friction coefficients of materials
and the sewing process. .
During the sewing, the center gauge (L) between
the walking foot sliding block and its shaft can be
adjusted according to the differences of the friction
coefficients of the friction coefficients of materials
and the sewing process. .
Method:
Increase L- the upper feed amount enlarged
Reduce L- the upper feed amount shortened
Method:
Increase L- the upper feed amount enlarged
Reduce L- the upper feed amount shortened
Clean the feed dog, the rotating hook and bobbin
case according to the machine use condition.
(1) Cleaning the feed dog
Remove the needle plate, clean off the dust and lint
in the slit of feed dog (A), then re-install the needle
plate.
(2) Cleaning the rotating hook
Clean off all the dust around the rotation hook (B)
and cleaning the bobbin case with soft cloth.
.
.
.
.
.
Clean the feed dog, the rotating hook and bobbin
case according to the machine use condition. .
(1) Cleaning the feed dog .
Remove the needle plate, clean off the dust and lint
in the slit of feed dog (A), then re-install the needle
plate. .
(2) Cleaning the rotating hook .
Clean off all the dust around the rotation hook (B)
and cleaning the bobbin case with soft cloth. .
In sewing operation, for preventing the walking
foot from striking on the presser foot a proper
clearance (C) of approx. 1.5mm should be maintained
between them. When the clearance is too sm ll or too
big, it is necessary to adjust. Loose rear crank screw
and turn the rock shaft, then the walking foot moves
near the needle bar. When adjusting, be sure to note
the fixed number of the clearance (C).
a
.
In sewing operation, for preventing the walking
foot from striking on the presser foot a proper
clearance (C) of approx. 1.5mm should be maintained
between them. When the clearance is too sm ll or too
big, it is necessary to adjust. Loose rear crank screw
and turn the rock shaft, then the walking foot moves
near the needle bar. When adjusting, be sure to note
the fixed number of the clearance (C). .
a
For special sewing requirements, for example, the
upper layer of materials needs more amounts than the
low layer needs. In this case, adjustment can be done
in the range of above theory for operation. .
For special sewing requirements, for example, the
upper layer of materials needs more amounts than the
low layer needs. In this case, adjustment can be done
in the range of above theory for operation. .
26. Upper feed adjustment (Fig. 27)
28. Periodical cleaning (Fig. 29)
27. Adjusting the clearance between
presser foot and walking foot (Fig. 28)
5
5
6
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