| CPC F04B 43/1276 (2013.01) | 10 Claims |
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1. A tube pump configured to send a fluid by using an elastic tube, the tube pump comprising:
the tube through which the fluid passes;
a roller configured to move along a partial zone in a flow path in which the fluid is sent through the tube, while crushing the tube, to push out the fluid in the tube; and
a roller holder configured to make the roller orbit around a predetermined center axis to make the roller repeatedly pass through a path along the partial zone, the roller holder being a member that makes the roller move while holding a shaft of the roller, wherein
in the roller holder, a guide groove is formed to have one end side and another end side, in a movement orientation in which the roller moves along the partial zone to push out the fluid, respectively defined as a rear side and a front side, the guide groove being a groove that receives the shaft of the roller to define a range in which the roller is movable with respect to the roller holder, wherein the guide groove is configured for guiding a movement of the roller between a squeeze position and a retracted position, wherein the squeeze position is disposed on the one end side, and the retracted position is disposed on the another end side,
the roller holder includes, as surfaces defining the guide groove,
an inner side surface that is a surface guiding a movement of the shaft of the roller on a side closer to the center axis than the shaft of the roller, and
an outer side surface that is a surface facing the inner side surface with the shaft of the roller interposed in between,
while the roller moves along the partial zone, the shaft of the roller is held at a rear end position that is a position at an end on the rear side in the movement orientation in the guide groove, and
the inner side surface has a protrusion protruding toward the outer side surface, wherein the protrusion is provided between the squeeze position and the retracted position,
the outer side surface has a recess recessed in a direction away from the inner side surface, at a position of the inner side surface facing the protrusion, and
wherein the inner side surface is formed in an arc shape which is interrupted by the protrusion such that the arc shape extends on both sides of the protrusion.
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