3.3 Setting the toothed belt tension
Caution: Danger of injury !
Switch off the main switch.
Check and adjust the setting of the toothed belt tension only
with the sewing unit switched off.
Standard checking
–
Push the transport carriage to the front.
–
Measure the distance between the toothed belt and the upper edge
of the table top with a measuring tape 1.
–
Pull down the toothed belt with a spring balance 2 and with a power
of 20 N.
–
The toothed belt tension is correct when the distance between
the toothed belt and the upper edge of the table top can be
reduced by 11 mm at 20 N (Example: 170-11 = 159 mm).
Correction
–
Adjust the toothed belt tension by turning the nut 7.
–
Adjust the belt pulley course through screws 6 and 8.
Consequences of a too high toothed belt tension
–
Reduced durability
–
Noisy running
Consequences of a too low toothed belt tension
–
No faultless meshing between belt teeth and disc toothing
–
The teeth may skip over under load
–
Non-uniform stitch lengths
–
Loss of steps possible
60
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876
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