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(3) Detecting mechanism and its adjustment
1) Adjusting the thread breakage detector (THR)
The detector detects thread breakage by checking whether the thread tension is applied to the take-up spring when
the detector receives the up-position signal from the main shaft.
1
Decrease
4
2) Adjusting the fine positioner mechanism
!1
6
7
9
8
5
!0
3
4
6
!4
1
5
8
6
7
2
3
Increase
!2
!3
!4
2
Fig.1
1
7
!3
Fig.2
1. Adjusting the thread take-up spring
The standard stroke of thread take-up spring 1 is 6 pull
the thread at the starting point is 20 through 40 g. To
adjust the stroke of the thread take-up spring,loosen set
screw 2, and turn tension controller assembly 3
clockwise to increase the stroke or counterclockwise to
decrease it. To adjust the tension of the thread take-up
spring, insert the blade of a flat-bit screwdriver into the
groove in tension post 4, and turn it clockwise to increase
the tension or counterclockwise to decrease it.
(Caution) Decrease the tension of the thread take-
up spring for a synthetic fiber thread.
Now, loosen setscrew 8, and adjust so that detector
plate 5 comes in contact with thread take-up spring 1
without fail.
Finally, confirm that detector plate cable 7 is insulated
by grounding wire 6 when the thread take-up spring
starts pulling the thread to apply appropriate tension to
the thread.
1) Attach fine positioning motor ! 2 to rod driving arm ! 3 so
that fine positioning link !4 smoothly moves without
interfering with rod gear B 6. When fitting fine positioning
motor !2 in rod driving arm !3 , attach hinge screws 4
which join fine positioning link !4 and fine position bracket
7. If the hinge screw is attached to the opposite side,
fine positioning link !4 will interfere with fine positioning
motor bracket 1 and fail to actuate. (See Fig.2)
2) When attaching fine positioning rod gear B 6 to fine
positioning motor bracket 1, position fine positioning
rod gear B 6 so that it can be rotated smoothly by hand
and deflects by 0.5 mm (0.020") or less at the top end of
the gear teeth. (Adjust the position of the fine positioning
rod gear B 6 with hinge screw
screw with out !1 . )
3) Attach fine positioning motor bracket 1 to main body
frame 2 so that a clearance of 1 mm (0.039") is provided
between LM guide 3 and hinge screws 4 and a
backlash of 1.5 mm (0.059") or less is provided between
fine positioning rod gear B 6.
4) After the fine positioning motor bracket has been
attached to the main body frame, manually move the
manual rotating shaft to check the clearance provided
between LM guide 2 and hinge screws 4. Fix spring
suspension to spinner oscillating arm returning spring
8 and LM guide 3.
63
−
−
. Then fix the hinge
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