Beisler 739-23-1 Service Manual - Manual (Page 7)

2.4 Height of needle bar
Caution! Risk of injury!
Switch off main switch.
Check and adjust height of needle bar only when the sewing machine
is switched off.
Instruction and inspection
In setting position A (loop stroke position) , the hook tip 4 must be
located at the centre of the needle scarf 5.
The adjustment of the height of the needle bar is carried out by means
of the measuring bridge 2 (0271 000766) and the setting pin 1 (0216
001069).
–
Loosen screw 6.
– Remove needle from needle bar.
– Insert setting pin 1 into the needle bar to the stop.
– Tighten screw 6.
– Place measuring bridge 2 onto throat plate surface.
– Lock machine head in setting position A.
The foot of the setting pin 1 must touch the measuring bridge 2.
Adjustment
–
Loosen screw 3.
– Move needle bar until the foot of the setting pin 1 touches the
measuring bridge 2.
Caution!
Do not distort needle bar as you move it.
– Tighten screw 3.
– Remove measuring bridge and setting pin.
– Re-install all removed components.
Caution!
After the adjustment of the height of the needle bar, the position of the
needle guard must be inspected and adjusted, if necessary.
Incorrect settings of the height of the needle bar may result in:
– damage to the hook tip.
– jamming of the bobbin thread between the needle and the needle
guard.
– incorrect stitches and thread breakage.
3-7
3
1
2
6
4
5