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US 2003/0169312 A1Published application
Tube pump and ink jet recording apparatus using the tube pump
AssigneeSeiko Epson Corporation
InventorsMitsugu Ota, Takashi Koase
Life of this patent
Estimating the term…
Abstract
A groove wall of a roller support groove opened to both end faces of a pump wheel comprises such a cam face wherein a roller rotates and rolls and is displaced from release operation position a to pump operation position b with rotation of the pump wheel in a pump operation direction from a release operation state and wherein the roller remains immobile and is displaced from the pump operation position b to the release operation position a with rotation of the pump wheel in a release operation direction from a pump operation state.
Claims8
A tube pump comprising:
- a pump frame having a tube support face for guiding a curve of a flexible in a circular-arc manner;
- a pump wheel rotatably disposed in the pump frame and having a roller support groove;
- a roller having a roller shaft, disposed rotatably and rollably on the pump wheel and relatively displaceable between a pump operation position and a release operation position in the roller support groove, the roller being configured to deform the flexible tube by a press contact so as to generate a pressure in the tube pump;
- and
- the roller shaft being guided by a groove wall in contact therewith;
- wherein the groove wall of the roller support groove is provided with a cam face configured such that
- the roller is relatively displaced from the release operation position to the pump operation position in a state that the roller rotates and rolls, when the pump wheel rotates from a release operation state in a pump operation direction;
- and
- the roller is relatively displaced from the pump operation position to the release operation position in a state that the roller does not rotate and roll, when the pump wheel rotates from a pump operation state in a release operation direction.
6 more elements
A tube pump comprising:
- a pump frame having a tube support face for guiding a curve of a flexible in a circular-arc manner;
- a pump wheel rotatably disposed in the pump frame and having a roller support groove;
- and
- a roller having a roller shaft, disposed rotatably and rollably on the pump wheel and relatively displaceable between a pump operation position and a release operation position in the roller support groove, the roller being configured to deform the flexible tube by a press contact so as to generate a pressure in the tube pump;
- the roller shaft being guided by a groove wall having a cam surface in contact therewith;
- wherein a cam curve of the cam face is a curve with an arbitrary point on a line represented by polar coordinates (r, θ) wherein the rotation center of the pump wheel is an origin, radius r is a function of angle θ found from r=C1× exp (α·θ), and end angle θβ, is a constant found from θβ=(1/α)× log (C2/C1), wherein
- polar coordinates (r, θ) of both end points on the curve are set to predetermined polar coordinates (C1 0) and (C2, θβ), and wherein
- pressure angle α of the cam face with respect to the roller shaft is set to a predetermined angle in the range of π/30 <α<π/20.
5 more elements
Dependencies are inferred from the claim text.