Self-locking filter-screen feeding device
AssigneePreviero N. S.R.L.
InventorFlavio Previero
Life of this patent
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Abstract
A self-locking filter-screen feeding device for plastic material; the device comprises a carriage which may be reciprocated on guide rods parallelly extending to a filter band movable across a flow-path for the plastic material to be filtered in a filter apparatus. The carriage is provided with a resting surface for the filter band and pressure members, angularly rotatable operatively connected to actuators for selectively engaging and urging the filter band against the resting surface and for reciprocating the carriage along the guide rods.
Claims7
Screen feeding device for a filter apparatus of the type comprising a flow-path for a flowable plastic material to be filtered by a screen in the form of a filter band transversely movable to the flow-path, and draw means for periodically advancing the filter band to substitute a clogged area with a clean one in said flow-path, the filter device comprising:
- a carriage movable along guide members parallely extending on a side of the filter band;
- surface means on the carriage for resting or supporting the filter band;
- at least one rotatable pressure member fastened to a shaft on the carriage, for engaging and pressing the filter band against said surface means;
- and
- drive means operatively connected to the pressure member and to the carriage to sequentially rotate the same pressure member and to reciprocate the carriage for selectively engaging and disengaging the filter band and move the carriage along the guide members between a retracted and an advanced position, to draw the filter band across said flow-path.
Dependencies are inferred from the claim text.