– 47 –
1. Start the test mode CP-7.
2. Tread on the pedal for needle thread clamp device
origin retrieval.
3. Press the key twice and set the needle thread clamp support
plate complete
in the needle thread clamp position.
4. Confirm that the clearance A becomes 0 between the needle thread
clamp device
and the needle thread clamp support plate complete
when the [–] key is pressed 3 to 4 times (for 3 to 4 pulses), and
that both the needle thread clamp device
and the needle thread
clamp support plate complete
move together when the [–] key is
pressed again.
5. If the clearance A becomes 0 with 5 or more pulses, loosen the set
screw
and fix the sensor mounting plate
after moving it in the
direction B.
6. If the clearance A becomes 0 with less than 3 pulses, loosen the set
screw
and fix the sensor mounting plate
after moving it in the
direction C.
7. After the sensor mounting plate
has been fixed, check the above-
mentioned steps 2. to 4.
8. Using 3 to 4 pulses, repeat the steps 2. to 6. above until the clear-
ance A becomes 0.
9. Tread on the pedal for needle thread clamp device
origin retrieval
and define the most advanced position by pressing the key
once.
10. Confirm that the distances between the needle thread clamp sup-
port plate complete
and the needle
are kept at 3 ~ 4mm and
1.7 ~ 2.3mm, respectively.
11. If the distance is found to be inadequate, adjust the position toward
the needle
according to (35) Needle thread clamp device con-
nection/disconnection. Since then, make the above-mentioned sen-
sor adjustments again.
Adjustment Procedures
Results of Improper Adjustment
o If there are too many pulses used
until the clearance A becomes 0,
this can be a cause of unthreading
at the beginning of sewing.
o If the number of pulses is too small
until the clearance A becomes 0,
the resistance toward the needle
thread becomes large and this
can be a cause of thread break-
age at the beginning of sewing.
o If the distance is improper be-
tween the needle thread clamp
support plate complete
and the
needle
, this will give rise to in-
terference between the needle
thread clamp device
and the
needle
.
Summary of Contents for LK-1900A
Page 20: ... 16 10 Hook adjustment Standard Adjustment 0mm 0mm 7 5mm 0 05 0 1mm For DPX5 For DPX17 ...
Page 90: ... 86 Grease Grease Grease Grease Grease 8 Needle thread clamp mechanism area ...
Page 91: ... 87 Grease Grease A Grease Grease Grease Grease 9 LK 1901A relations ...
Page 92: ... 88 10 LK 1903A relations Grease Grease ...
Page 114: ... 111 12 Circuit diagrams 1 Block diagram A ...
Page 115: ... 112 2 Power supply circuit diagram A ...
Page 116: ... 113 3 Power supply circuit diagram B ...
Page 117: ... 114 4 Power supply circuit diagram C ...
Page 118: ... 115 5 Servo motor circuit diagram ...
Page 119: ... 116 6 Sensor pedal VR circuit diagram ...
Page 120: ... 117 7 MAIN PANEL board circuit diagram ...
Page 121: ... 118 8 Motor solenoid circuit diagram Thread trimmer Lifting the work clamp foot motor ...