A device is privided for feeding objects into a waste bin (3) of an analyzer comprising a transport path (4), a transport carriage (5) for a tray (7) carrying a container (6) and a processing station (8) having an aspirating head (80) for substances to be analyzed.
A feeding chute (1) is removably arranged on a retainer (2) within the transport path (4), held by a resetting means (22) in its feeding position, and can be pivoted to its end position (11) lying outside the transport path (4) by means of a transport carriage (5) driven by a microprocessor-controlled stepper motor (40).
Means (12) are arranged on feeding chute (1) forming part of the transport path (4) when the chute is in its end position.
Retainer (2) includes a blocking element (20) which in the retainer's end position (21) and with the feeding chute (1) being removed projects into the transport path (4) and limits the travel of the transport carriage (5), resulting in a reduced stepping number of stepping motor (40) when returning the transport carriage (5) until a sensor (9) is reached in the area upstream of feeding chute (1).
A control unit then shuts down a processing station (8), in particular the dumping of a used pipette (81) from aspirating head (80) and thus contamination of the substances to be analyzed or the analyzer itself is prevented.