# US 9,004,991 B2 · Temperature control apparatus of working machine

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- Number: US 9,004,991 B2
- Document ID: US9004991B2
- Status: Granted
- Kind: B2
- Application number: 12/821,615
- Filed: 2010-06-23
- Published: 2010-12-23
- Granted: 2015-04-14
- Earliest claimed: 2009-06-23
- Assignees: Dmg Mori Seiki Co., Ltd.
- Applicants: Yoshiaki Sugimoto; Takashi Hoshi; Kiyoshi Yoshioka; Soichiro Yamada
- Inventors: Yoshiaki Sugimoto; Takashi Hoshi; Kiyoshi Yoshioka; Soichiro Yamada
- Web page: https://patentgrep.com/patent/US9004991B2

## CPC

- B23Q 11/148: {by controlling the air temperature}
- G05D 23/1931: {to control the temperature of one space}
- G05D 23/2039: {using mechanical means}
- B23Q: DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING (tools of the kind used in lathes or boring machines B23B27/00); MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

## Abstract

Provided is a temperature control apparatus of a working machine that is inexpensive, energy-saving and capable of eliminating the temperature difference between a temperature in a room in which the working machine is installed and a temperature of a working area.

## Claims

### Claim 1

A temperature control apparatus of a numerically controlled machine tool including ventilating means for replacing internal air in a working area with external air surrounding the numerically controlled machine tool between the working area inside the numerically controlled machine tool and the exterior of the numerically controlled machine tool, comprising:
at least one temperature sensor that detects at least one temperature in the working area;
an external air temperature sensor that detects an external temperature surrounding the numerically controlled machine tool;
a ventilating means drive unit that drives the ventilating means; and
a ventilating means control unit that compares one of the at least one temperature in the working area, which is detected with the at least one temperature sensor, the external temperature surrounding the numerically controlled machine tool, which is detected with the external air temperature sensor, and a pre-set target temperature in the working area and, in accordance with the result of the comparison, outputs a signal for driving or stopping the ventilating means to the ventilating means drive unit when the numerically controlled machine tool is not being operated,
wherein the ventilating means comprises a cover for an opening, which covers at least a part of the working area, and is kept closed during the operation of the numerically controlled machine tool,
wherein when the numerically controlled machine tool is not being operated, the cover is opened such that air replacement performed by the ventilating means is performed only if the one of the at least one temperature in the working area is (i) higher than both the external temperature surrounding the numerically controlled machine tool and the target temperature in the working area, or (ii) lower than both the external temperature surrounding the numerically controlled machine tool and the target temperature in the working area,
wherein when the numerically controlled machine tool is being operated, the cover is closed such that air replacement performed by the ventilating means cannot be performed, and
wherein air replacement performed by the ventilating means is performed by opening and closing the cover for the opening only when the numerically controlled machine tool is not being operated.

### Claim 2 (depends on 1)

The temperature control apparatus of a numerically controlled machine tool according to claim 1, wherein one of the at least one temperature in the working area that is detected with the at least one temperature sensor is an air temperature in the working area.

### Claim 3 (depends on 1)

The temperature control apparatus of a numerically controlled machine tool according to claim 1, wherein one of the at least one temperature in the working area that is detected with the at least one temperature sensor is a headstock temperature of the numerically controlled machine tool.

### Claim 4 (depends on 1)

The temperature control apparatus of a numerically controlled machine tool according to claim 1, wherein the external temperature surrounding the numerically controlled machine tool that is detected with the external air temperature sensor is an air temperature in the room in which the numerically controlled machine tool is installed.

### Claim 5 (depends on 1)

The temperature control apparatus of a numerically controlled machine tool according to claim 1, wherein the ventilating means control unit outputs the signal only during a specific time period of a day.

### Claim 6

A temperature control apparatus of a numerically controlled machine tool including ventilating means for replacing internal air in a working area with external air surrounding the numerically controlled machine tool between the working area inside the numerically controlled machine tool and the exterior of the numerically controlled machine tool, comprising:
at least one temperature sensor that detects at least one temperature in the working area;
an external air temperature sensor that detects an external temperature surrounding the numerically controlled machine tool;
a ventilating means drive unit that drives the ventilating means; and
a ventilating means control unit that compares one of the at least one temperature in the working area, which is detected with the at least one temperature sensor, the external temperature surrounding the numerically controlled machine tool, which is detected with the external air temperature sensor, and a pre-set target temperature in the working area and, in accordance with the result of the comparison, outputs a signal for driving or stopping the ventilating means to the ventilating means drive unit when the numerically controlled machine tool is not being operated,
wherein the ventilating means comprises a cover for an opening, which covers at least a part of the working area, and is kept closed during the operation of the numerically controlled machine tool,
wherein when the numerically controlled machine tool is not being operated, the cover is opened such that air replacement performed by the ventilating means is performed only if the one of the at least one temperature in the working area is (i) higher than both the external temperature surrounding the numerically controlled machine tool and the target temperature in the working area, or (ii) lower than both the external temperature surrounding the numerically controlled machine tool and the target temperature in the working area,
wherein when the numerically controlled machine tool is being operated, the cover is closed such that air replacement performed by the ventilating means cannot be performed, and
wherein one of the at least one temperature in the working area that is detected with the at least one temperature sensor is a headstock temperature of the numerically controlled machine tool.

### Claim 7 (depends on 6)

The temperature control apparatus of a numerically controlled machine tool according to claim 6, wherein another of the at least one temperature in the working area that is detected with another of the at least one temperature sensor is an air temperature in the working area.

### Claim 8 (depends on 6)

The temperature control apparatus of a numerically controlled machine tool according to claim 6, wherein the external temperature surrounding the numerically controlled machine tool that is detected with the external air temperature sensor is an air temperature in the room in which the numerically controlled machine tool is installed.

### Claim 9 (depends on 6)

The temperature control apparatus of a numerically controlled machine tool according to claim 6, wherein the ventilating means control unit outputs the signal only during a specific time period of a day.