Fitting And Tensioning The V-Belt - DURKOPP ADLER 768 Setting Instructions Manual

5.4

Fitting and tensioning the V-belt

The V-belt 6, V-belt pulley 2 and sewing-drive belt guard 14 are parts of the drive kit.
Both belt-guard parts 5 and 8, the position holder 4 and the pad 1 will be found in the
special sewing machine's accessory pack.
Removing the guards
If the guards for the V-belt 6 are already in place on delivery, they must be removed for
the V-belt to be fitted.
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Unscrew position holder 4.
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Remove pad 1 after undoing the two screws 10 from the stitch-regulator lever 3.
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Undo attachment screws of both belt-guard parts 5 and 8.
The screws are accessible through the holes in the belt-guard parts.
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Remove the rear belt guard 8.
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Remove front belt guard 5 over stitch-regulator lever 3.
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Remove the belt-guard cover 14 on the sewing drive.
NB:
In the illustration the handwheel 7 has only been removed to improve visibility.
It need not be removed in order to fit the V-belt 6.
Fitting the V-belt and mounting the belt guard on the upper part
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Attach V-belt pulley 12 to the shaft of the sewing drive 13.
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Place the V-belt 6 on the belt pulley 2 on the upper part of the sewing machine.
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Pass the V-belt 6 down through the opening in the table plate.
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Fold back the upper part of the sewing machine.
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Place the V-belt 6 on the belt pulley 12 of the sewing drive.
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Return the upper part of the sewing machine to its original position.
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Fit the two-part belt guard 5 and 8 to the upper part of the sewing machine,
placing the slit in the front guard 5 over the stitch-regulator lever 3.
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Attach the pad 1 to the stitch-regulator lever 3 with screws 10.
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Attach position holder 4 to the rear belt guard 8.
The function of the position holder is to stop the proximity switch 9 from twisting.
Tensioning the V-belt
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Undo screw 16 on the base of the sewing drive 13.
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Tension the V-belt 6 by swivelling the sewing drive 13.
When the belt is correctly tensioned It must be possible to depress it by
about 10 mm by gently pressing on it with a finger at its mid-point.
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Tighten screw 16.
Fitting the belt guard to the sewing drive
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Adjust the anti-throw protectors 11 and belt-gripping device 15 of the belt guard 14.
The V-belt 6 must remain on the belt pulleys when the upper part of the sewing
machine is folded back. See the motor manufacturer's operating manual!
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Screw on the cover of the belt guard 14.
GB
13