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8-9. Needle thread clamp unit (optional)
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start
of the sewing machine.
When the clamp of the needle thread clamp unit is in
the lower position, standard height A of the underside
of the clamp from the top surface of presser support
plate ❷ is 6 mm.
When using a heavy-weight material or the like, the
clamp may come in contact with the material. In this
case, loosen screw ❶ and adjust the clearance be-
tween the underside of the clamp in its lower position
and the material to 2 to 3 mm.
When you have adjusted the height, check
to make sure that the clearance D provided
between the top end of the clamp and the
screw of the needle bar thread guide is 1.5
to 2 mm.
In the case the sewing machine is installed with the
needle thread clamp unit, the position of the needle
thread drawing arm will be different from its position
without the unit.
Dimension C described in "8-5. Adjusting the needle
thread drawing amount" p. 69 is 23 mm.
(Standard dimension C is 18 mm for the sewing ma-
chine which is not provided with the needle thread
clamp unit.)
The length of the needle thread remaining on the nee-
dle can be adjusted by setting it on the operation panel.
It is adjusted by setting the needle thread tension.
Referring to "9-1. Operating procedure of thread
tension compensation of each section" p. 73 for
the setting procedure, call Compensation Position No.
54 on the display.
When the set value (initial value: 0) is increased to a
positive value, the more the number is increased, the
shorter the remaining thread will become.
When the set value is decreased to a negative value,
on the contrary, the length of thread remaining on the
needle is increased.
The setting can be separately done on a pattern-by-pat-
tern basis.
The thread tension controller for the needle thread
clamp unit works to prevent the thread from loosening
at the end of sewing.
Turn the tension regulating knob to adjust distance B
to 15 to 16 mm.
A
❷
B
❶
D
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