Speed modulation gearboxes0 pages

The purpose of a speed modulation gearbox is the possibility to increase or decrease the
revolution speed by means of a temporary additional rotation. Said operation is effected
manually, with motors or motor reducers, through a worm screw having an high reduction
ratio. The angular speed adjustment can also be performed when the machine is running, by
overlapping the effects of the different handlings and thus reducing the expensive non-working
periods.The operation principle of UNIMEC’s speed modulation gearboxes is the same as the
planetary gearboxes, the only difference being the external ring gear, is not connected to the
body, but is contrasted by an adjustment worm screw. Rotating this device, and as a
consequence rotating the planetary system too, it is possible to modify the transmission
output revolution speed. Machines made of various working stations, with conveyor belts and
feeding lines (typical of the paper, packaging and press sectors, etc.) nd their ideal solution
in the speed modulation gears, in order to synchronize the various delivery phases.
Mechanical speed modulation gearboxes
Speed modulation gearboxes can also be used as non-stop speed modulators. It is therefore
possible, in case for example of coiling lines, to modify the speed of one or more stations
in order to obtain constant pulls. Other typical applications for speed modulation gearboxes
are the press machines, the sheet working machines, the paper and packaging machines,
where the control for waste reduction and for the machines setting requires high handling
precisions.
3 versions, 5 models and 85 construction forms, mean a wide range of application for a
designer. In addition to standard models, UNIMEC is able to provide special custom
designed speed modulation gearboxes suited to the requirements of specic machines.
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