JUKI AMS-221EN Series Engineer's Manual page 37

1. Apply a proper amount of grease (Juki Grease A) to the grooved cam block of the cam
block, and the rollers of the presser bar lifter link
which grease • Locktight is applied o TENSION RELEASE & THREAD TRIMMER MECHANISM
COMPONENTS."
2. While the cam is being inserted in the shaft of the presser lifting motor
sewing machine frame and tighten the four setscrews
order not to hurt the bearing
3. Adjust the position of the cam
thread trimmer link
both ends of the shaft.)
4. Mount the sensor slit
coincide with that of the sensor slit
* Confirm that the slit plate of the sensor slit
5. Refer to "3.-(20) Thread trimmer and presser origin sensor adjustment" and make sensor adjustments.
Adjustment Procedures
1. Start the test mode I07.
2. Tread on the pedal for the retrieval of the thread trimmer and presser
bar lifter (cam) origin.
3. Make sure that the standard holes (
trimming motor stand are aligned with the standard hole
thread trimmer and presser lifter cam
4. If the standard hole
C
is too high ( direction), loosen the set screw
E
sor mounting plate
If the standard hole
is too low ( direction), loosen the set screw
D
sensor mounting plate
After securing the sensor mounting plate
by pressing the pedal to make sure that the standard holes are aligned.
5. Repeat the above steps 2 to 4 until the coincidence is confirmed.
(Caution) Tighten the set screw
interference between the sensor slit plate
sor.
Procedures of assembling
.
so that Clearance A of 0.5 to 0.7mm is secured between the cam
. Since then, fix the cam
with the 2 setscrews
. (Join the flat section for installation.)
(ø3) and
A
using a bar
of the thread trimmer and presser lifter cam
upward ( direction) and secure it.
E
of the thread trimmer and presser lifter cam
C
downward ( direction) and secure it.
D
, conduct origin retrieval
after confirming that there is no
and the thread trimmer link
. The insertion of the cam should be done gently in
with 2 setscrews . (Adjust the screw to the flat parts on
so that the end plane of the motor shaft can approximately
does not interfere with the presser bar lifter sensor.
) of the thread
B
of the
C
.
and move the sen-
and move the
and the sen-
– 33 –
, the peripheral cam
. Refer to "10.-(4) Parts to
, mount the assembly on the
Results of Improper Adjustment
o If the standard holes are not
aligned, the thread trimming
timing error occurs and defective
thread trimming and unthreading
at the beginning of sewing may
be caused.
and the