Usually the rollers or pulleys are curved (See Roller design for conveyor belts)
But this is not enough in some cases: side loading, short and wide belts, need for high precision of straightness.
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In this case, you can add a guide:
The guide uses the roll groove to guide the conveyor belt.
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Grooves can also be machined:
In this case the rollers are provided with guides.
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In the case of moulded belts, it is possible to form grooves or guides in order to ensure perfect guidance on the rollers:
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It is also possible to produce Poly-V power transmission belts for low forces:
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