Needle-To-Hookrelationship; Auxiliary Thread Tension Controller (Dsc-245-4,-7, Dsc-245V-4,-7) - JUKI DSC-245 Instruction Manual

17.NEEDLE-TO-HOOKRELATIONSHIP

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
● Positioning the needle bar
● First,set the needle bar at the proper height as follows
Set the stitch length dial at "0".
Adjust so that,when hook point ❹ meets the center of needle ❺ ,the hook point is 1.5 mm above the upper end of
the needle eyelet. Then tighten screw ❸ of needle bar bracket ❷ .(As a rough indication of this adjustment,marker
line A on the needle bar aligns with the bottom face of the needle bar frame ❶ .)
● Then,adjust the timing between the needle and the hook as follows:
Adjust so that,when the needle bar goes up to 2.4 mm above its lowest point,hook point ❻ nearly meets the center
of needle ❹ .Then tighten setscrew ❺ .(As a rough indication of this adjustment,marker line B on the needle bar
aligns with the bottom face of the needle bar frame ❶ .)
● How to remove the hook
1. Tum the handwheel to bring the needle bar up to its highest position.
2. Remove the hook cover,the bobbin case,the throat plate and the top cover of the bed.
3. Loosen four throat plate frame setscrews.
4. Loosen the hook setscrew,and extract the hook so as to lift the front edge of the throat plate frame.
（Note）
When installing the hook,tighten the throat plate frame after checking that the protruding portion of the hook
stopper in the throat plate frame are properly inserted in the slot in the bobbin case retainer.

18.AUXILIARY THREAD TENSION CONTROLLER (DSC-245-4,-7, DSC-245V-4,-7)

● Positioning the hook
1. Adjust the auxiliary thread tension using nut ❶ .
Turn the nut in direction A
1)
→ Tension increases and the needle thread shortens.
Turn the nut in direction B
2)
→ Tension decreases and the needle thread lengthens.
3) Decrease the tension when using a thin thread or if
cloth slippage often occurs.
4) Increase the tension when using a thick thread or if
upper cloth tends to slip forward.
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