| 摘要 |
Described herein is an improved variable speed processor (10) in which the path length for material to be processed can be varied in a processing tank whilst maintaining a substantially constant volume of processing solution in that tank. The processor (10) comprises a plurality of processing tanks (12,14,16) in which a respective movable rack member (42,44,46) is located, each rack member (42,44,46) extending through bottom wall (52,54,56) of its associated tank (12,14,16). The path length is determined by the relative position of roller (32,34,36) mounted on rack member (42,44,46) with respect to a fixed location in the processing tank (12,14,16). For path lengths shorter than the maximum for a particular processing tank, the rack member (42,44,46) acts as a spacer in the tank (12,14,16) to maintain the volume of processing solution at a substantially constant level.
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