Adjusting The Stitch Length; Adjusting The Differential Feed Ratio - JUKI MF-7523 Instruction Manual

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.
❶
❷
❸

5. Adjusting the differential feed ratio

❸
❶
❷
Gathering
Stretching
❸
❷
❶
‒ 13 ‒ – 13 – – 13 –
The stitch length can be infinitely 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 ❶ 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 ❷ and turn clockwise feed regulating knob
❶ to regulate the stitch length.
Push pin ❸ until it goes to the end, and fix it with screw ❷ .
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 ❶ and move lever ❷ up to
increase the differential feed ratio. Then the sewn material
is gathered.
Move lever ❷ down to decrease the differential feed ratio.
The differential feed ratio becomes 1 : 1 at the position
where the pointer of lever ❷ 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 ❸ .
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.