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4-6. Adjusting the thread take-up spring and the thread breakage detector plate
4-7. Adjusting the thread take-up stroke
1) Adjusting the stroke
Loosen setscrew
❷
. Turn thread tension con-
troller
❸
. Turning it clockwise will increase the
stroke of the thread take-up spring
❶
and the
thread drawing amount will increase.
2) Adjusting the pressure
To change the pressure of the thread take-up
spring
❶
, insert a thin screwdriver into the slot of
thread tension post
❹
while screw
❷
is tightened,
and turn it. Turning it clockwise will increase the
pressure of the thread take-up spring
❶
. Turning
it counterclockwise will decrease the pressure.
3) Adjusting the thread breakage detector plate
Loosen setscrew
❻
. Adjust the position of thread
breakage detection plate
❺
so that the contact
depth between thread breakage detection plate
❺
and thread take-up spring
❶
becomes 0 to 0.2
mm.
1) When sewing heavy-weight materials, move
thread guide
❶
to the left (in direction
A
) to
increase the length of thread pulled out by the
thread take-up.
2) When sewing light-weight materials, move thread
guide
❶
to the right (in direction
B
) to decrease
the length of thread pulled out by the thread take-
up.
3) Normally, thread guide
❶
is positioned in a way
that the center of elongated hole is aligned with
the center of the screw.
Adjust so that thread breakage detector
plate
❶
does not touch any adjacent
metallic parts other than thread take-up
spring
❷
. If the thread breakage detec-
tion plate comes in contact with any oth-
er metal part, a maloperation can occur.
❶
B
A
❷
❷
❶
❶
❺
❺
❹
❹
❻
❻
❸
❸
