Importance

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Abstract

This relates to an oscillating or reciprocating conveyor wherein the work pieces move in a single plane, generally horizontal, and wherein the conveyor, if desired, may also be a rocking conveyor. This particularly relates to a drive for such a conveyor wherein the conveyor is moved in the work piece advanced direction by a fluid cylinder and wherein there are compression springs for moving the conveyor rearwardly at the end of each forward stroke. More particularly, there are provided rapid exhaust systems for cylinders whereby the conveyor and work pieces carried thereby may be advanced at a relatively slow uniform rate and at least at certain predetermined periods the fluid cylinder can be rapidly exhausted and driven by the spring or springs so as to rapidly reverse the direction of movement of the conveyor with the result that the conveyor moves rearwardly while the advanced work pieces remain stationary. If desired, a suitable shock absorber arrangement may also be provided. The fluid system may include valving which permits the back and forth reciprocation of the conveyor and work pieces carried thereby beneath a blast wheel followed by a periodical rapid return of the conveyor so that the work pieces are in effect advanced relative to the blast wheel.

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First Claim