9.03.18
Clearance between roller presser and feed wheel
， 。7 mm
Requirement
7 mm
When the presser bar lifter is raised, the clearance between the
roller presser and the feed wheel must be .
● 。
● ( )。。
●
●
1 2
1 2 Requirement
Raise the presser bar lifter.
Adjust the presser bar (screws ) according to the .
Make sure that the roller presser is parallel to the feed wheel.
9-22
Adjustment
9-41
Adjustment
9.04.06
Bobbin thread retaining spring
。
，
1.
2.
3
Requiement
3
1. the bobbin thread clamp spring should be guided reliably in the thread groove of the thread
catcher .
2. the tension of the bobbin thread spring clamp should be as low as possible, but the bobbin
thread should be reliably after the cutting operation.
●
（ ）。
● ，
4。
●
●
●
。
1
1 2
2
1
1 2
Requirement 1
Requirement 2
4
1
1
Adjust bobbin thread
clamp spring (screw )
in accordance with
.
Adjust the tension in
accordance with
by
bending side of the
bobbin thread clamp
spring .
● 1。。
●
●
● ，，
。。
●
3
1
Switch off the machine and bring the take-up lever to its bottom dead centre.
Engage and disengage the thread cather by hand and check
. Adjust if necessary.
After the thread has been cut, sew a few stitches by turning the balance
wheel, checking whether the bobbin thread is drawn out of the bobbin
thread clamp spring between the and stitched, if necessary, correct
the tension.
,
Control requirement
3
Requirement 1
2
1 3
Control requirement 2
1 3
st rd
9.03.21
Synchronization of roller presser and feed wheel
，
。
30
Requirement
30 needle penetrationsAfter in a strip of leather the total length from the
first the the last penetration should be the same, both in the lower and the
upper leather layer.
● “ ”。
● ， 。
● 、。
● （ ）。
● “ ”
●
●
●
3
30
1 2
30 times
1 2 Requirement
Set stitch length 3 .
By turning the balance wheel, let the needle enter .
Compare the total sewn length of the lower and upper leather layer.
Adjust clamp (screw ) according to the .
。1
1
Clamp must not be positioned diagonally to the rock shaft.
9-25
Adjustment
edge of the needle plate (see arrow).
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