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Chapter 9 Maintenance
Retensioning the strap and the drive chain
The pull-in step of the conveying strap at the drive roller results from friction. To resolve
the sliding resistance of the conveying strap that depends on load, a particular tangential
force is required at the drive roller. So that this tangential force can be generated at the
drive roller, a special belt pretensioning is necessary. The dimension of the belt
pretensioning depends on frictional coefficient between conveying strap and driving
cylinder as well as on angle of deflection of the conveying strap. The belt pretensioning is
generated by readjusting of the threaded spindle at the clamping fixture or at longer
systems by weight-loaded or spring-weighed clamping fixtures. The belt pretensioning
should not be larger as the faultless pull-in step of the conveying strap of the drive roller
requires.
Guiding value of the belt tension is 0,5% expansion of the transport belt.
Requirements
The labeling station is without power (no electrical power or compressed air)
The product is not being transported
Instruction
Please adjust the web tension as follows.
Step
Procedure
1
Apply two markings at the surface of the transport belt in a maximum distance (e. g.
500mm).
2
Calculate
+0,5%=2,5mm).
3
Tension the transport belt with the clamping fixture until the distance between the
markings is larger by the calculated value (e. g. 500mm+2,5mm = 502,5mm).
Version: 02.08.12
Fig. 9-1 Retension transport belt
the
required
expansion
Page 64 of 71
of
the
belt
(e.g.
32708732 Geset 121
expansion:
500mm
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