| 摘要 |
The invention relates to a device (1) that is provided with a pusher (7) which is fixed to the free ends of two parallel piston rods (13, 14). The piston-cylinder units (15, 16) appurtenant thereto are fixed to a support structure (17) and can be pivoted to-and-fro, together with said structure, around a vertical axis (18) and about approximately 105.degree. between a placing plate (3) and a conveyor belt (5). Compressed air nozzles (11) for producing a negative pressure in angles (10) of the pusher (7) are supplied with compressed air from a first feeding chamber (22) by means of a supply channel (12) of the pusher (7) and one (13) of the piston rods and the pistons (21) appurtenant thereto. The supply is carried out by means of a first directional control valve (29) of a first compressed air source being provided with relatively low pressure. The pusher (7) is pushed forwards by means of the piston-cylinder unit (16) and a second directional control valve (40) of a second compressed air source (42) being provided with relatively high pressure. The pusher (7) is withdrawn by impinging upon withdrawal chambers (35, 43) with compressed air which is taken from the second compressed air source (42) by means of a third directional control valve (46).
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