JUKI DDL-9000A, Engineer'S Manual

Page: 47 / 113

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1) Adjustment of upper stop position (Stop position after thread
trimming)
The standard needle stop position is located where the engraved
marker dot A of the pulley cover coincides with the white marker dot
B of the hand wheel.
1. Turn off the power supply.
2. Pressing the + switch of the control box, turn ON the Power switch.
(Cautions) Screen display setup No. E is 121 and the setup
contents F is for the rpm indication. If the screen
display is kept unchanged, repeat the operation of 1.
and 2. again.
3. Using the switch or the switch , set up the screen display setup
No. E.
4. Set up the setup contents F within the range of –15 to 15, by means
of the switch or .
(Standard setting is 0. The setup value denotes an approximate
revolving angle.)
When the value is set in + direction, the upper needle stop position
is lowered. (Direction of C)
When the value is set in – direction, the upper needle stop position
is raised. (Direction of D)
5. When this setting is finished, press the switch or to fix the
updated value.
(Cautions) If the power supply is turned OFF prior to this work,
the contents cannot be updated.
2) Adjustment of lower stop position
The goal stop position is secured when reading on the front part of
the pedal to obtain a neutral condition.
1. Similar to the adjustment of upper stop position (stop position after
thread trimming).
(Cautions) Screen display setup No. E is 122.
<When it is fast>
o The remaining needle thread length
becomes shorter after thread
trimming.
<When it is slow>
o Interference between the needle
and the thread wiper unit
o The remaining needle thread length
becomes longer after thread
trimming.
o The remaining needle thread length
becomes uneven after thread
trimming.
Adjustment Procedure Results of Improper Adjustment