Checking The Positioning; Setting The Positions - DURKOPP ADLER 381 Installation Instructions Manual

6.9 Checking the positioning

Reference position
The reference position is the starting point for all factory-set positions. In the reference
position, the point of the lowered needle stands level with the top of the throat plate.
Position 1
The 1st position serves for starting the cutting process if the sewing machine is supplied
with a thread cutter. The sewing machine is then 2 mm behind its lower dead point.
Position 2
In the 2ne position, the thread take-up lever must be in its upper position.
Checking the positioning
After thread cutting, the sewing machine must stop in the 2nd position (thread take up
lever in upper position).
–
Turn on main switch.
–
Lower the pedal briefly forwards.
–
Lower the pedal backwards completely and hold it lowered.
The thread will be cut.
The sewing machine will stop in the 2nd position (thread take-up lever in upper
position).
–
Check whether the thread take-up lever stands in its upper dead position.
–
Normally, here ends the checking process. Should it be necessary to correct the
factory setting, proceed for programming the positions as follows.

6.10 Setting the positions

It is necessary to proceed to a new setting of the position transmitter after following
operations:
–
Fitting the position transmitter when installing the special sewing machine
–
Removing the position transmitter
–
Replacing the position transmitter
–
Replacing the complete drive controller
The digital position transmitter does not require any mechanical adjustments.
It is only necessary to set the reference position when taking the machine into service
for the first time.
The machine positions are sensed by steps (increments) by the position transmitter and
they are shown by the display. One rotation of the handwheel corresponds to 512 steps.
The change of the display is done by 2 steps. A change from one display value to the
other corresponds consequently to a rotation angle of about 1,4°.
The angle position of the positions 1 and 2 in respect top the reference position is
defined by a certain number of increments.
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