11.11 Aligning the Light Barriers of the Remaining Thread Monitor
The light barrier mountings 3 and 6 are set at the factory so that a
sufficient safety clearance of 5-6 mm to the moving hooks is provided.
The alignment of the reflecting light barriers occurs in program P51.
ATTENTION !
The remaining thread monitor is only activated when the value for the
underthread counter is set to "0000" in program P41.
Calling up the alignment
–
Set the "Program" switch to "41".
–
Press the "STOP" key
The program is activated.
The lower line of the display shows two bobbins.
–
Insert an empty bobbin in the bottom of the bobbin case.
–
Turn the empty bobbin manually.
–
If the infra-red beam of the light barrier hits the reflecting surface 7
of the bobbin hub this must be shown in the display.
A reflection of the left light barrier is shown in the left half of the
lower line of the display by the symbol "]->>".
A reflection of the right light barrier is shown in the right half of the
lower line of the display by the symbol "<<-[".
–
If no reflection is indicated when turning the empty bobbin then the
alignment of the light barrier is to be corrected.
Correcting the alignment
–
Clean the lenses of the light barriers 1 and 5 and the reflecting
surfaces 7 of the bobbin hubs with a soft cloth.
–
Loosen clamping screw 2 or 4.
–
Align light barrier 1 or 5 respectively by a slight movement on the
bracket 3 resp. 6.
The infra-red beam of the light barrier 1 or 5 must strike the bobbin
hub unhindered through the light opening in the bobbin case.
–
Tighten the clamping screw 2 or 4.
–
Check the alignment of both light barriers again.
7
4
5
6
1
2
3
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