| 摘要 |
<p>A sorting machine comprising a transparent tube (16); a material supply member (15) from which material, which is to be sorted into desired and undesired portions, may pass through the transparent tube (16); light- detecting means (20) disposed externally of the transparent tube (16) for receiving light from material passing through the latter; discrimination means (21), controlled by the light-detecting means (20), for discriminating between the said desired and undesired portions; separator means (22), controlled by the discrimination means (21), for separating the material which has been passed through the transparent tube (16) into the said desired and undesired portions; a cleaning member (32); and moving means (36) for moving the cleaning member (32) against the wall of the transparent tube (16) characterised in that the cleaning member (16) forms part of a cleaning-calibration member (31), there being means for using the cleaning-calibration member (31) in the calibration of the discrimination means (21); and actuating means (30) to effect relative movement of the material supply member (15) and the cleaning-calibration member (31) so that each of said members (15,31) is at times disposed in an operative position while the other member is in an inoperative position. <IMAGE></p> |
