MEDIUM AND HEAVY DUTY FRICTION ROLLERS 333
The chain-driven friction rollers are a set of two coaxial rollers; the outer roller, which supports the load, is connected to the inner chain driven one by special sleeve bearings that create a “friction couple” proportional to the conveyed load (in some types of rollers this force can be increased by an auxiliary axial friction clutch).
This section presents chain-driven friction rollers for conveying and accumulating medium and heavy unit loads.
They can be driven by sequential chain links or by a simple or double tangential chain.
They are supplied with the auxiliary axial friction clutch which can be operated by means of a ring nut.
See Catalogue for operational characteristics, dimensions, weights, and executions upon request.
FMT ROLLERS DRIVEN BY A TANGENTIAL CHAIN: OPERATIONAL CHARACTERISTICS
In this gearing system the overall performance is given by the amount of the single performances. Therefore, on the same terms, it allows to connect to a single engine a higher number of rollers in comparison with the sequence drive system.
The tangential drive system is more silent than the roll-to-roll one and it is particularly suitable for continuous handling with constant speed.
FMS ROLLERS DRIVEN BY SERIES CHAIN LINKS: OPERATIONAL CHARACTERISTICS
The overall performance in the roll-to-roll system is the product of the performance ratings of the individual links, and rapidly decreases as the number of links increases. For this reason the chain pull increases exponentially the close it is to the drive unit.
The roll-to-roll system, which is noisier that the tangential one is particularly suitable when frequent stops and starts with high accelerations are expected.