Non-rolling type peristaltic pump having pressure plate mounted tube biasing means

A peristaltic pump which comprises:

• a curved platen;
• a rotatable multi-lobed cam spaced from said platen;
• means for rotating said cam in a first direction;
• a plurality of pump fingers, each having a first end riding on said cam and a second end adjacent to said platen;
• means for interposing a resilient tube between said platen and said pump fingers;
• said cam configured to first sequentially move said pump fingers toward said platen to compress said tube and second sequentially allow said pump fingers to be moved away from said platen;
• each of said pump fingers sized to compress said tube as said cam moves said pump fingers toward said platen;
• a plurality of pinch fingers mounted on said platen, each pinch finger oriented opposite one of said pump fingers so that said pump fingers and said pinch fingers engage opposite sides of said tube to fully occlude said tube;
• and
• each said pinch finger comprising a slidable member extending through a transverse slot in said platen and further including means for biasing each said pinch finger in a direction extending outwardly of said transverse slot.

A peristaltic pump which comprises:

• a substantially flat platen;
• a cam assembly comprising a plurality of parallel cams spaced from said platen;
• means for rotating said cam assembly in a first direction;
• a plurality of pump fingers, each having a first end riding on one of said cams and a second end adjacent to said platen for movement toward and away from said platen during rotation of said cam assembly;
• means for interposing a resilient tube between said platen and said pump fingers;
• said cam assembly configured to first sequentially move said pump fingers toward said platen to compress said tube and second sequentially allow said pump fingers to be moved away from said platen;
• each of said pump fingers sized to compress said tube as said cam moves said pump fingers forward said platen;
• a plurality of pinch fingers, each pinch finger mounted on said platen opposite one of said pump fingers so that said pump fingers and said pinch fingers engage opposite sides of said tube to fully occlude said tube;
• and
• each said pinch finger comprises a slidable member extending through a transverse slot in said platen and further including means for biasing each said pinch finger in a direction extending outwardly of said transverse slot.