Adjusting The Thread Trimming Cam - JUKI LH-3500A series Instruction Manual

6-3. Adjusting the thread trimming cam

7
1 2
!0
3
5
4
Surface B
6
!1
6
8
9
A
– 36� –
(1) Position of the thread trimming cam and
the thread trimming timing
) Algn engraved marker dot 1 on the arm wth
engraved marker dot 2 (red) on the handwheel.
2) When thread trmmer drvng arm stopper 3
comes n contact wth knfe drvng arm 4 , press
cam roller 5 nto the groove n thread trmmng
cam 6 .
3) Keepng the aforementoned state, turn thread
trmmng cam 6 untl the locaton as ndcated
n the sketch on the left s reached. When the
thread trmmng cam s brought to the locaton as
ndcated n the sketch (the ntermedate pont of
the secton where the shape of groove n thread
trmmng cam 6 changes from lnear shape to
dagonal shape), tghten two clampng screws of
thread trmmng cam 6 .
[Checkng the tmng of the thread trmmng cam]
) Press cam roller 5 nto the groove n the cam
until it securely fits in there.
2) Turn handwheel 7 n the opposte drecton of
the rotatng drecton of the sewng machne untl
ts smooth move s hndered. At ths tme, check
to be sure that engraved marker dot 1 on the
arm s algned wth engraved marker dot 2 (red)
on the handwheel.
(2) Clearance between the thread trimming
cam and thread tension release arm
) �epress thread tenson release arm 8 .
2) At ths tme, adjust so that clearance A of 0.5 mm
s provded between surface B of the rght end
face of thread trmmng cam 6 and roller secton
9 of thread tenson release arm 8 .
3) To adjust, loosen two setscrews !0 , adjust the
poston of thread tenson release drvng arm
stopper !1 so that t s spaced 0.5 mm from sur-
face B, and tghten two setscrews !0 .
* In the case the clearance s larger than 0.5 mm:
The space pn mechansm does not rse enough,
resultng n a thread trmmng falure.
* In the case the clearance s smaller than 0.5
mm:
Roller secton 9 comes n contact wth thread
trmmng cam 6 to dsable the thread trmmer
operaton.