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4. Adjusting the stitch length
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the follow-
ing work after turning the power off and ascertaining that the motor is at rest.
The stitch length can be innitely adjusted from 1.2 mm to
3.6 mm.
* The actually sewn stitch length varies in accordance
with kind and thickness of the materials.
[How to change the stitch length]
Turn clockwise feed regulating knob
to increase the
stitch length.
Turn it counterclockwise to decrease the stitch length.
• When making the stitch length 3.6 mm or more
Loosen screw
and turn clockwise feed regulating knob
to regulate the stitch length.
Push pin
until it goes to the end, and x it with screw
.
Use the machine within the range where feed dogs or feed
dog and throat plate do not come in contact with each oth-
er.
Loosen differential lock nut
and move lever
up to
increase the differential feed ratio. Then the sewn material
is gathered.
Move lever
down to decrease the differential feed ratio.
The differential feed ratio becomes 1 : 1 at the position
where the pointer of lever
is on the long scale. Note
that two scales on the upper side show 1 : 1.4 and 1 : 2
respectively, and one on the lower side 1 : 0.7.
Fine adjustment of the differential feed ratio can be per-
formed with micro-adjustment knob
.
There is a case where feed dogs or feed
dog and throat plate come in contact with
each other by the aforementioned adjust-
ment according to the relation between the
stitch length and the differential feed ratio.
So, be very careful.
5. Adjusting the differential feed ratio
Gathering
Stretching
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