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Adjustment Procedures Results of Improper Adjustment
1. Checking the thread trimmer cam timing
The work up to steps 1) through 8) is the same as that of (4) Checking
and adjusting the receding position of the moving knife.
Execute the work up to steps 1) through 8).
9) Then turn handwheel 7 in the normal direction of rotation of the sewing
machine A while depressing the back part of pedal 8 in the direction B.
(Moving knife lever 9 turns clockwise in the direction H after the moving
knife has fully receded, and moving knife !0 starts moving in the direction
I to return to the waiting position.
10) When turning handwheel 7 in the reverse direction of rotation of the
sewing machine J after the moving knife has returned to the waiting
position, the handwheel cannot turn at a certain angle.
(Caution) Be sure to turn OFF the power switch to the sewing machine
after completion of the work of steps 4) through 10).
11) When the height of the needle bar from the top surface of the throat
plate is 46.8 to 47.4 mm, the thread trimmer cam timing is normal.
12) It is easy to check the height when the gauge supplied as accessories
is used.
When section K of the gauge enters between the throat plate and the
bottom end of the needle bar and section L does not enter, the height
of the needle bar is within the range of 46.8 to 47.4 mm and the thread
trimmer cam timing is normal.
13) When entering the gauge in the bottom end of the needle bar, loosen
setscrew !2 and remove presser foot !3. Return presser foot !3 to the
home position after the completion of the work and securely tighten
setscrew !2. (Tightening torque : 1.5 to 2N.m)
14) When the height of the needle bar from the top surface of the throat
plate is not 46.8 to 47.4 mm, the thread trimmer cam timing is not proper.
Adjust the thread trimmer cam timing according to 2. Adjusting the thread
trimmer cam timing below
2. Adjusting the thread trimmer cam timing
1) Loosen setscrews 1 in the thread trimmer cam in the order of screw
No. 1 to screw No. 2.
2) Press down roller arm 2 to make thread trimmer cam 3 and roller 4
engage with each other.
* Workability is improved when medium-sized screwdriver 5 supplied
as accessories or the like is inserted between roller arm 2 and driving
arm stopper 6.
(Caution) Make the state that roller arm 2 is fully pressed down so
that the clearance is not provided between roller arm 2
and knife driving arm !1.
3) Turn the handwheel to the right direction,then stop it where the distance
between of bottom end of needle bar and surface of the throat plate
comes to meet the mark M.
4) Turn thread trimmer cam 3 only by fingertip in the reverse direction of
rotation of the hook driving shaft without turning the hook driving shaft,
lightly press thread trimmer cam 3 to roller 4 at the position where
thread trimmer cam 3 does not turn, and tighten screw No. 2 of thread
trimmer cam 3.
* When cam collar !4 is not moved, press thread trimmer cam 3 to cam
collar !4 and tighten thread trimmer cam 3.
5) Draw out screwdriver 5 inserted between roller arm 2 and driving arm
stopper 6, and tighten screw No. 1 of thread trimmer cam 3.
6) After adjusting the cam timing, check the timing described in the previous
item. (Height of the needle bar is within the range of gauges K, M and
L.)
™ Thread trimmer cam timing is set
in accordance with the standard
value (return amount : 1.8 mm)
of the hook timing.
When the hook timing is
excessively changed from the
standard value, even when the
thread trimmer cam timing is
adjusted to the standard value
(46.8 to 47.4 mm), thread
trimming failure occurs. So, be
careful.
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