Positioning - DURKOPP ADLER 768 Setting Instructions Manual

6.10

Positioning

6.10.1 Definition of the Positions
Reference position
The reference position is the initial position for all further positions. It is defined as the
needle position in which the needle point, with lowered needle in normal direction of
turn, lies at the level of the top of the needle plate. After a removal of the synchronizer
only the reference position must be reset, all further positions, with correctly set
controls, are then automatically correct again.
Position 1
In the 1st Position the lower edge of the needle eye of the lowering needle 1 in the
normal direction of turn lies at the same height as the hook cover ring 2.
Position 1A
This position is only required for internal functions of the controls, it should lie at least
60 increments after position 1.
Position 2
In the 2nd position the needle bar lies at the upper dead center.
Position 2A
This position is only required for internal functions of the controls, it should lie at least
60 increments after position 2.
Position 3
This position is not required for the classe 768.
Position 3A
This position is not required for the classe 768.
6.10.2 Setting Positions with a DC1600/DA82GA Direct-current Positioning Drive
6.10.2.1 General
The digital synchronizer sends the controls 512 impulses (increments) and an
additional impulse once per revolution. All needle positions are determined by these
impulses and by the values of the parameters F-170 and F-171.
No mechanical settings are required on the synchronizer.
Attention!
After the following work all positions must be reset.
1. First operation of the sewing drive.
2. Replacement of the sewing drive, the drive controls or the control plate of the
drive controls.
3. Replacement of the EPROMs in the drive controls.
After the following work only the reference position must be reset.
1. Removal and mounting or replacement of the synchronizer.
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