ELEVATING DEVICE AND CONTROL METHOD THEREOF, AND IMAGING APPARATUS
First Claim
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1. An elevating device comprising:
- a reservoir which reserves fluid therein;
a pump comprising a suction port and a discharge port;
a cylinder configured to elevate an object to be elevated according to an amount of fluid held therein;
a first flow path which connects said reservoir and said suction port;
a second flow path which connects said discharge port and said cylinder;
a third flow path which connects said cylinder and said reservoir;
a fixed flow valve which is provided on said third flow path and causes fluid to flow at a predetermined flow rate; and
control device configured to control said pump, to lower the object to be elevated, so as to ad just a flow rate of discharge of the fluid by said pump to the same flow rate as the predetermined flow rate thereby to bring the discharge flow rate and a flow rate of the fluid returned to said reservoir through said fixed flow valve into equilibrium, and thereafter make the discharge flow rate smaller than the predetermined flow rate thereby to reduce the amount of the fluid held in said cylinder.
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Abstract
An elevating device based on fluid control includes a pump and a cylinder that are connected to each other by a flow path, wherein the cylinder and a reservoir are connected to each other by a flow path via a fixed flow valve that allows fluid to flow at a predetermined flow rate. When a lowering operation of a table section is carried out, a pump-valve control unit brings a flow rate of discharge of the fluid by the pump and a flow rate of the fluid returned to the reservoir through the fixed flow valve into equilibrium and thereafter sets the flow rate of discharge of the fluid by the pump smaller than the predetermined flow rate thereby to reduce the amount of the fluid held in the cylinder.
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Citations
20 Claims
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1. An elevating device comprising:
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a reservoir which reserves fluid therein; a pump comprising a suction port and a discharge port; a cylinder configured to elevate an object to be elevated according to an amount of fluid held therein; a first flow path which connects said reservoir and said suction port; a second flow path which connects said discharge port and said cylinder; a third flow path which connects said cylinder and said reservoir; a fixed flow valve which is provided on said third flow path and causes fluid to flow at a predetermined flow rate; and control device configured to control said pump, to lower the object to be elevated, so as to ad just a flow rate of discharge of the fluid by said pump to the same flow rate as the predetermined flow rate thereby to bring the discharge flow rate and a flow rate of the fluid returned to said reservoir through said fixed flow valve into equilibrium, and thereafter make the discharge flow rate smaller than the predetermined flow rate thereby to reduce the amount of the fluid held in said cylinder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a elevating device for elevating all object to be elevated, the elevating device having a reservoir which reserves fluid therein, a pump having a suction port, and a discharge port, a cylinder which elevates an object to be elevated according to an amount of fluid held therein, a first flow path which connects the reservoir and the suction port of the pump, a second flow path which connects the discharge port of the pump and the cylinder, a third flow path which connects the cylinder and the reservoir, and a fixed flow valve which is provided on the third flow path and causes fluid to flow at a predetermined flow rate, said method comprising a step of:
controlling the pump, to lower the object to be elevated, so as to adjust a flow rate of discharge of the fluid by the pump to the same flow rate as the predetermined flow rate thereby to bring the discharge flow rate and a flow rate of the fluid returned to the reservoir through the fixed flow valve into equilibrium, and thereafter make the discharge flow rate smaller than the predetermined flow rate thereby to reduce the amount of the fluid held in the cylinder.
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12. An imaging apparatus comprising:
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a table section which supports a subject; a table moving section configured to move said table section to an imaging space; and an imaging device configured to image the subject supported by the table section, wherein said table moving section comprises; a reservoir which reserves fluid therein, a pump comprising a suction port and a discharge port, a cylinder configured to elevate an object to be elevated according to an amount of fluid held therein, a first flow path which connects said reservoir and said suction port, a second flow path which connects said discharge port and said cylinder, a third flow path which connects said cylinder and said reservoir, a fixed flow valve which is provided on said third flow path and causes fluid to flow at a predetermined flow rate, and control device configured to control said pump, to lower the object to be elevated, so as to adjust a flow rate of discharge of the fluid by said pump to the same flow rate as the predetermined now rate thereby to bring the discharge flow rate and a flow rate of the fluid returned to said reservoir through said fixed flow valve into equilibrium, and thereafter make the discharge flow rate smaller than the predetermined flow rate thereby to reduce the amount of the fluid held in said cylinder. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification