－
20
－
(1) adjusting the stroke of thread take-up
spring
) The standard stroke of the thread take-up sprng s
6 to mm.
2) To change the stroke of thread take-up sprng
1
,
Ioosen screw
2
in the tension post socket, fit a flat-
bt screwdrver n the groove n tenson post
3
and
turn the post wth the screwdrver. Turnng the post
clockwse (n drecton
A
) wll ncrease the stroke.
Turnng t counterclockwse (n drecton
B
) wll de-
crease t.
(2) adjusting the pressure of thread take-up
spring
) The pressure of the thread take-up sprng should
be adjusted to 0.5 to 0.25N when t starts pullng
the thread.
2) Ft a flat-bt screwdrver n the groove n tenson
post
3
, and turn the tenson post clockwse (n d-
recton
A
) to ncrease the pressure of thread take-
up sprng, or counterclockwse (n drecton
B
) to
decrease t.
4-7. thread take-up spring
1. When adjusting the stroke of thread take-up spring, the position of the thread breakage de-
tecting plate should also be adjusted. adjust the position of the thread breakage detecting
plate so that it always comes in contact with the thread take-up spring when the thread take-
up spring is not threaded. (Deflection of the spring is approximately 0.5 mm)
* Do not adjust the stroke of thread take-up spring using the thread breakage detecting plate.
Doing so may result in thread take-up spring breakage.
2. Confirm that the tension disc comes in close contact with the thread take-up spring after the
stroke of thread take-up spring after the stroke of thread take-up spring has been adjusted.
If the tension disc does not come in close contact with the thread take-up spring, Ioosen
sorew
2
in the tension post socket, and draw the tension post in direction
4
to make the
adjustment.
1
2
3
A
B
C
