# US 2013/0239705 A1 · Liquid feeding device using ball screw, and analyzer

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2013/0239705 A1
- Document ID: US20130239705A1
- Status: Published application
- Kind: A1
- Application number: 13/423,687
- Filed: 2012-03-19
- Published: 2013-09-19
- Earliest claimed: 2012-03-19
- Assignees: Shimadzu Corporation
- Inventors: Nobuhiro NAMIKAWA; Takeaki INOUE; Akioki NAKAMORI; Shinsuke INOUE; Yasuhiro TAKAYAMA
- Web page: https://patentgrep.com/patent/US20130239705A1

## CPC

- G01N 1/14: Suction devices, e.g. pumps; Ejector devices
- G01N 33/1846: {Total carbon analysis}
- G01N 2001/1427: {Positive displacement, piston, peristaltic}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A control device controls driving of a pulse motor to cause liquid that is sucked into a syringe in a single suction process to be discharged over a plurality of discharge processes. The control method of the control device is a method that controls driving of the pulse motor so that rotation of a ball screw for executing each discharge process starts from an identical rotational angle position relative to a slit of a coupling.

## Claims

### Claim 1

A liquid feeding device, comprising:
a syringe having a piston capable of sliding in a cylinder, and having a liquid inlet/outlet port at a distal end of the cylinder, in which a piston rod that is integrated with the piston protrudes to a proximal end side of the cylinder, the syringe performing suction and discharge of a liquid from the inlet/outlet port by causing the piston to slide through the piston rod;
a syringe support unit comprising a piston rod support body that is attached to the piston rod, and a ball screw that is screwed together with the piston rod support body, the syringe support unit using the ball screw as a linear feed mechanism to move the piston rod support body by rotation of the ball screw;
a pulse motor that causes the ball screw to rotate;
a rotation detection mechanism comprising a coupling formed in a disk shape that has a slit in a radial direction and that is attached integrally with the ball screw so as to rotate together with the ball screw, and a photo sensor that is combined with the coupling so as to detect a position of the slit of the coupling; and
a control device that controls driving of the pulse motor so as to discharge a liquid that is sucked into the syringe in a single suction process over a plurality of discharge processes, and so that rotation of the ball screw for executing each discharge process starts from an identical rotational angle position relative to the slit.

### Claim 2 (depends on 1)

A total organic carbon measurement instrument, comprising:
a sample supply unit including a liquid feeding device that collects and supplies sample water;
an oxidative decomposition unit that is connected to the sample supply unit and that oxidizes organic matter contained in the sample water supplied from the sample supply unit to carbon dioxide;
a carbon dioxide separation unit that includes a sample water channel through which the sample water that has passed through the oxidative decomposition unit flows, and a measurement water channel through which measurement water comprising deionized water flows, wherein a gas permeable membrane is interposed between the sample water channel and the measurement water channel to enable transfer of carbon dioxide therethrough; and
a conductivity measuring unit that measures a conductivity of the measurement water from the carbon dioxide separation unit;
wherein a liquid feeding device according to claim 1 is used as the liquid feeding device of the sample supply unit.

### Claim 3 (depends on 2)

The total organic carbon measurement instrument according to claim 2, wherein:
the sample supply unit comprises a multiport valve including at least a port connected to a channel that supplies sample water, a port connected to a channel that supplies pure water, a port connected to the oxidative decomposition unit, a port opened to the atmosphere, and a common port that is in communication with any one of the ports by switching; and
the inlet/outlet port of the syringe of the liquid feeding device is connected to the common port.