MICROPUMP
First Claim
1. A micropump comprising:
- a tube frame including an elastic tube, and a tube guide groove for attachment of the tube in the form of an arc;
a cam drive wheel whose rotation center is the same as an arc center of the tube guide groove, and moves in response to a motor that can be rotated in forward and reverse directions;
a first cam that is axially fixed to a center axis of the cam drive wheel, and is provided with a finger depression section at a circumferential portion thereof;
a second cam that is pivotally supported by the center axis of the cam drive wheel to be able to rotate, and is provided with a finger depression section at a circumferential portion thereof; and
a plurality of fingers provided between the tube and the respective finger depression sections of the first and second cams radially from the rotation center, whereinthe micropump can be ina first state of continuously feeding a fluid by, when the first cam is rotated in the forward direction, the first cam pushing and rotating the second cam in the same direction, by the finger depression sections of the first and second cams respectively depressing the fingers one by one, and by the fingers sequentially closing and opening the tube repeatedly from a fluid inflow side to a fluid outflow side,a second state of rotating only the first cam in the reverse direction at a time of, in the first state, a detection of a position where the finger depression section of the second cam releases the tube from depression by the fingers, anda third state of stopping the first cam from rotating at a time of, in the second state, a detection of a position where the first cam releases the tube from depression by the fingers, andthe first state is retained by a drive command coming from the micropump being in the third state.
1 Assignment
0 Petitions
Accused Products
Abstract
A micropump that includes: a tube frame including an elastic tube, and a tube guide groove for attachment of the tube in the form of an arc; a cam drive wheel whose rotation center is the same as an arc center of the tube guide groove, and moves in response to a motor that can be rotated in forward and reverse directions; a first cam that is axially fixed to a center axis of the cam drive wheel, and is provided with a finger depression section at a circumferential portion thereof; a second cam that is pivotally supported by the center axis of the cam drive wheel to be able to rotate, and is provided with a finger depression section at a circumferential portion thereof; and a plurality of fingers provided between the tube and the respective finger depression sections of the first and second cams radially from the rotation center. The micropump can be in a first state of continuously feeding a fluid by, when the first cam is rotated in the forward direction, the first cam pushing and rotating the second cam in the same direction, by the finger depression sections of the first and second cams respectively depressing the fingers one by one, and by the fingers sequentially closing and opening the tube repeatedly from a fluid inflow side to a fluid outflow side, a second state of rotating only the first cam in the reverse direction at a time of, in the first state, a detection of a position where the finger depression section of the second cam releases the tube from depression by the fingers, and a third state of stopping the first cam from rotating at a time of, in the second state, a detection of a position where the first cam releases the tube from depression by the fingers. The first state is retained by a drive command coming from the micropump being in the third state.
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Citations
16 Claims
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1. A micropump comprising:
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a tube frame including an elastic tube, and a tube guide groove for attachment of the tube in the form of an arc; a cam drive wheel whose rotation center is the same as an arc center of the tube guide groove, and moves in response to a motor that can be rotated in forward and reverse directions; a first cam that is axially fixed to a center axis of the cam drive wheel, and is provided with a finger depression section at a circumferential portion thereof; a second cam that is pivotally supported by the center axis of the cam drive wheel to be able to rotate, and is provided with a finger depression section at a circumferential portion thereof; and a plurality of fingers provided between the tube and the respective finger depression sections of the first and second cams radially from the rotation center, wherein the micropump can be in a first state of continuously feeding a fluid by, when the first cam is rotated in the forward direction, the first cam pushing and rotating the second cam in the same direction, by the finger depression sections of the first and second cams respectively depressing the fingers one by one, and by the fingers sequentially closing and opening the tube repeatedly from a fluid inflow side to a fluid outflow side, a second state of rotating only the first cam in the reverse direction at a time of, in the first state, a detection of a position where the finger depression section of the second cam releases the tube from depression by the fingers, and a third state of stopping the first cam from rotating at a time of, in the second state, a detection of a position where the first cam releases the tube from depression by the fingers, and the first state is retained by a drive command coming from the micropump being in the third state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A micropump comprising:
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a tube frame including an elastic tube, and a tube guide groove for attachment of the tube in the form of an arc; a cam drive wheel whose rotation center is the same as an arc center of the tube guide groove, and moves in response to a motor that can be rotated in forward and reverse directions; a first cam that is axially fixed to a center axis of the cam drive wheel, and is provided with a finger depression section at a circumferential portion thereof; a second cam that is pivotally supported by the center axis of the cam drive wheel to be able to rotate, and is provided with a finger depression section at a circumferential portion thereof; and a plurality of fingers provided between the tube and the respective finger depression sections of the first and second cams radially from the rotation center, wherein the micropump can be in a first state of continuously feeding a fluid by, when the first cam is rotated in the forward direction, the first cam pushing and rotating the second cam in the same direction, by the finger depression sections of the first and second cams respectively depressing the fingers one by one, and by the fingers sequentially closing and opening the tube repeatedly from a fluid inflow side to a fluid outflow side, a second state of rotating only the first cam in the reverse direction at a time of, in the first state, a detection of a position where the finger depression section of the second cam releases the tube from depression by the fingers, and a third state of stopping the first cam from rotating at a time of, in the second state, a detection of a position where the first cam releases the tube from depression by the fingers, a communications device is provided, the positions in the second and third states are respectively detected by an external detector, and a detection result is provided via the communications device, and the micropump is operated for the first to third states.
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13. A micropump comprising:
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a tube frame including an elastic tube, and a tube guide groove for attachment of the tube in the form of an arc; a cam drive wheel whose rotation center is the same as an arc center of the tube guide groove, and moves in response to a motor that can be rotated in forward and reverse directions; a first cam that is axially fixed to a center axis of the cam drive wheel, and is provided with a finger depression section at a circumferential portion thereof; a second cam that is pivotally supported by the center axis of the cam drive wheel to be able to rotate, and is provided with a finger depression section at a circumferential portion thereof; and a plurality of fingers provided between the tube and the respective finger depression sections of the first and second cams radially from the rotation center, wherein calculations are made of the number of pulses, of the motor, needed for the first cam to rotate once, and for the first cam in an initial state to come in contact with the second cam, and from the total number of pulses driven from start to stop, a calculation is made of the number of pulses needed to bring the first and second cams to the positions when the motor is stopped, and to put the first and second cams in the initial state, and the initial state is creased by driving the motor in the forward or reverse direction. - View Dependent Claims (14, 15, 16)
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Specification