Pump apparatus

摘要

A pump apparatus includes: a stationary shaft; a rotation-regulating member having a coil main body wound around the stationary shaft, the rotation-regulating member being permitted to rotate in a direction of loosening the coil main body and the rotation-regulating member being restrained from rotating in a direction of tightening the coil main body; a driven rotatable member that may rotate around the stationary shaft when a driving force of a driving source is transmitted; and a suction pump that has a rotary member driven together with rotation of the driven rotatable member and that performs a suction operation when the rotary member rotates. The suction pump is configured such that the rotation-regulating member rotates in the tightening direction of the coil main body when the driven rotatable member rotates in a direction opposite to a direction in which the driven rotatable member performs the suction operation.

主权项

1. A pump apparatus comprising:
a stationary shaft; a rotation-regulating member having a coil main body wound around the stationary shaft, the rotation-regulating member being permitted to rotate in a direction of loosening of the coil main body to increase a diameter of the coil main body and the rotation-regulating member being restrained from rotating in a direction of tightening of the coil main body to decrease the diameter of the coil main body; a driven rotatable member to which an end of the coil main body of the rotation-regulating member is attached, the driven rotatable member being able to rotate around the stationary shaft when a driving force of a driving source is transmitted to the driven rotatable member; a driving-force transmission assembly that transmits the driving force of the driving source to the driven rotatable member; and a suction pump having a rotary member that is driven together with rotation of the driven rotatable member, the suction pump being configured to perform a suction operation when the rotary member rotates while pressing a flexible tube; wherein the suction pump is configured such that the rotation-regulating member rotates in the tightening direction of the coil main body when the driven rotatable member rotates in a direction opposite to a direction in which the driven rotatable member performs the suction operation, wherein when the driving-force transmission assembly contacts the rotation-regulating member, the driving-force transmission assembly turns the rotation-regulating member in the loosening direction such that the diameter of the coil main body is increased and turns the driven rotatable member in a direction opposite to the rotary direction in which the suction operation is performed.