Light Barrier Of Residual-Thread Monitor - Duerkopp Adler 743-221 Service Manual

2.9

Light barrier of residual-thread monitor

14
1 2
Regulation and inspection
If the light barrier is properly aligned a reflection occurs when an
empty bobbin is rotated.
The alignment of the light barrier is carried out in program 42.
Caution: danger of injury
Turn off the motor safety switch.
The reflex light barrier may only be aligned with the motor safety
switch turned off.
IMPORTANT !
The residual-thread monitor is only operational if the value for the
shuttle-thread counter in program 41 has been set to 0000.
Checking the alignment
–
Place an empty bobbin on the sleeve (gauge 5, section 2.1) and
insert it in the bobbin housing.
–
Move the shuttle by turning the handwheel until the infra-red
radiation of the light barrier 1 can fall on the bobbin hub through
the light aperture in the bobbin housing (shuttle beak down).
–
Set "program" switch to 42.
–
Press "STOP" button.
The program is activated.
–
Rotate empty bobbin with the sleeve (gauge 5).
If the infrared radiation from light barrier 1 falls on the reflective
surface 3 of the bobbin hub, this must appear in the display:
display with reflection:
display with no reflection:
3