Inspection and ejector unit

摘要

An inspection and ejector unit for preforms for plastic containers in a transportation line, has at least one driver device which picks up preforms travelling from an inward conveyor device to the inspection and ejector unit, transports them further and passes on at least some of the preforms to an outward conveyor device, at least one detection device by which faulty preforms in the driver device are detected, and at least one ejection device by which preforms which are detected as faulty are removed from the driver device, and a corresponding method.

主权项

1. An inspection and ejector unit for plastic preforms for plastic containers in a transportation line upstream of a blow molding machine, the plastic preforms having an elongate hollow cylindrical body with a surrounding collar, the inspection and ejector unit comprising
at least one driver device (8) which picks up plastic preforms (10) travelling from an inward conveyor device (2) to an inspection and ejector device (1), transports them further and passes on at least some of the plastic preforms (10) to an outward conveyor device (3), wherein the driver device (8) is a star wheel with recesses (9) which receive the cylindrical bodies (11) of the plastic preforms (10) with positive fit but without additional force-locking and on which the surrounding collars (12) of the plastic preforms (10) rest during the transport; at least one detection device (6) by means of which faulty plastic preforms (10) in the star wheel (8) are detected; and at least one ejection device (17, 25) by means of which plastic preforms (10) which are detected as faulty are removed from the star wheel (8), wherein a first pneumatic ejection device (17) lifts up a faulty plastic preform (10) from bottom to top by means of a vertical air pulse (L1), and wherein a second pneumatic ejection device (25) is provided above the star wheel (8) by means of which the lifted-up faulty plastic preform (10) is ejected in an essentially horizontal direction by means of a horizontal air pulse (L2), the horizontal air pulse (L2) being longer in duration than the vertical air pulse (L1), the duration of the horizontal air pulse (L2) being at least 1 second.