Thread Take-Up Spring - JUKI AP-876/IP-420 Instruction Manual

4-7. thread take-up spring

C
B
A
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) adjusting the stroke of thread take-up
) The standard stroke of the thread take-up sprng s
2) To change the stroke of thread take-up sprng 1 ,
1
(2) adjusting the pressure of thread take-up
) The pressure of the thread take-up sprng should
2
3
2) Ft a flat-bt screwdrver n the groove n tenson
20
－ －
spring
6 to  mm.
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.
spring
be adjusted to 0.5 to 0.25N when t starts pullng
the thread.
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.