JPH0578441U - Electric path connection device for tool holder with built-in electric device - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents failures such as poor contact from occurring in the connector that connects the electric device such as the motor built into the tool holder and the wiring on the machine tool body side where the tool holder is set. To do. [Construction] A connector for electric circuit connection, which is fitted and connected to a lateral position of a spindle 8 of a machine tool body 7 and a lateral position of a tool holder 1 with a built-in electric device when the tool holder 1 is set on the spindle 8. 11 are arranged side by side, and a cylindrical cover 13 surrounding the connector (socket portion 12A) on the machine tool main body 7 side is provided side by side on the machine tool main body 7 side. , A normally closed lid 20 that is pushed inward by a connector (jack portion 12B) on the tool holder 1 side is provided, and wiring 16a on the machine tool body 7 side and an electric device with a built-in tool holder are provided via the connector 11 ( The motor 2) is connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a tool holder that is attached to and detached from the machine tool side spindle by an automatic tool changer, especially a built-in motor that drives a tool held by the tool holder at a high speed by a high-frequency motor included in the tool holder. A tool holder that can be used as a touch sensor for detecting a reference point, including a tool holder, a contact for a work, etc., and a detector for detecting the contact movement of the contact, The present invention relates to an electric path connection device for a tool holder with a built-in electric device, which is used in a fixed state together with a spindle without rotating the holder.

[0002]

[Prior art and its problems]

 When this type of tool holder with built-in electrical equipment is set on the spindle of the machine tool, the power supply wiring and signal transmission wiring on the machine tool body and the electrical equipment contained in the tool holder are electrically connected. Must be connected. Therefore, at the side of the main shaft of the machine tool and the side of the tool holder with built-in electrical equipment, electric line connection connectors that are fitted and connected to each other when the tool holder is set on the main shaft are installed in parallel. The wiring on the machine tool body side and the built-in electric device of the tool holder are electrically connected via this connector.

In a conventional tool holder with a built-in electric device of this type, since the electric path connecting connector on the machine tool body side is exposed, a normal tool holder is set on the spindle and When the rotary cutting tool held by the tool holder is rotationally driven to perform a cutting operation or the like, scattered cutting oil or cutting chips easily adhere to the connector on the machine tool body side. Therefore, when using a tool holder with a built-in electric device as described above, normal fitting between the connector on the tool holder side and the connector on the machine tool body side and normal electrical connection between the connectors are There is a risk that the adhered foreign matter may hinder the normal electrical action of the built-in electric device.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned conventional problems, and the features thereof are shown by the reference numerals of the embodiments described later, and the tool holder with a built-in electric device of the present invention is shown. Is an electric circuit connector 11 which is fitted and connected to a side position of the spindle 8 of the machine tool body 7 and a side position of the tool holder 1 with a built-in electric device when the tool holder 1 is set on the spindle. A cylindrical cover 13 surrounding the connector (socket portion 12A) on the machine tool main body 7 side is provided side by side on the machine tool main body 7 side, and the tip end opening 13a of the cylindrical cover 13 is A normally closed lid 20 that is pushed inward by a connector (jack portion 12B) on the tool holder 1 side is provided, and wiring 16a on the machine tool main body 7 side and electrical equipment with a built-in tool holder are provided via the connector 11. Characterized in that (motor 2) and are connected.

[0005]

【Example】

 Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1A, reference numeral 1 is a tool holder having a high-frequency motor 2 incorporated therein, and a tip thereof is driven to rotate at a high speed by the motor 2. A tool chuck 3 is provided, and a grip portion 4 and a taper shank portion 5 which are gripped by an automatic tool changing device are provided at the rear end. A positioning key groove 6 is formed on the peripheral edge of the grip portion 4. Reference numeral 7 denotes a machine tool main body having a spindle 8 that is rotationally driven. The spindle 8 has a tapered hole 9 into which the tapered shank portion 5 of the tool holder 1 is fitted and fixed, and the tool holder 1 described above. There is provided a positioning key 10 that fits in the positioning key groove 6 of FIG.

A socket portion 12A of a connector 11 for electric circuit connection is attached to a lateral position of the spindle 8 of the machine tool body 7 in a direction parallel to the spindle 8, and the tool holder 1 side is provided with a holder body. A jack portion 12B of the connector 11 is attached to the tip of an arm 13 projecting laterally from 1a in parallel with the protruding direction of the tapered shank portion 5.

More specifically, as shown in FIGS. 1A and 1B, the connector socket portion 12A is mounted on the bottom surface of the cylindrical cover 13 and includes a required number of resin-molded female terminals 14. A wire 16a of a power supply cable 16 whose end is fixed to the cylindrical cover 13 by a cable fixing means 15 is connected to each of the female terminals 14. The connector jack portion 12B includes a required number of male terminals 18 resin-molded in a cylindrical case 17 that is fitted onto the connector socket portion 12A. 19a is connected. This cable 19 is guided from the inside of the connector jack portion 12B through the inside of the arm 1b into the holder main body 1a, and the other end of its wiring 19a is connected to the power supply terminal of the motor 2.

The tubular cover 13 is provided with a normally closed lid 20 that opens and closes the front end opening 13 a. The normally closed lid 20 is pivotally mounted in a cylindrical cover 13 by a support shaft 21 so as to be swingable, and is biased in a closing direction by a spring 22 to form an annular flange portion forming the tip opening portion 13a. It is in contact with the inside of 13b. Reference numeral 23 is an oil seal such as an O-ring buried inside the flange portion 13b, which enhances the sealing effect of the normally closed lid 20.

According to the above configuration, when the tool holder 1 is not used, that is, when the connector socket portion 12A on the side of the working machine body 7 is not used, as shown in FIG. Since the tip end opening 13a of the cylindrical cover 13 that encloses the socket 12A is closed by the normally-closed lid 20, a normal tool holder is set on the main spindle 8, and the main spindle 8 rotates the tool holder. When the cutting tool is rotationally driven to perform a cutting operation or the like, the scattered cutting oil and cutting chips do not adhere to the connector socket portion 12A on the machine tool body side.

Prior to use, the tool holder 1 has a rotary chucking tool 24, etc., attached to the tool chuck 3 as shown in the figure, and the tool holder 1 is machined by an automatic tool changer for gripping the gripping portion 4. The spindle 8 on the machine side is set as is well known in the art. That is, the tapered shank portion 5 of the tool holder 1 is inserted and fixed in the tapered hole 9 of the spindle 8 so that the key 10 on the spindle 8 side fits into the positioning key groove 6. At this time, the connector jack portion 12B on the tool holder 1 side enters into the cylindrical cover 13 on the machine tool body 7 side while pushing the normally closed lid 20 against the urging force of the spring 22 while opening it toward the inside of the cover. As shown in FIG. 2, it is fitted and connected to the connector socket portion 12A in the tubular cover 13. That is, the male terminals 18 of the connector jack portion 12B are inserted into the female terminals 14 of the connector socket portion 12A, and the power supply wiring 16a on the machine tool body 7 side and the wiring 19a on the holder body 1a side are connected. Connected.

By connecting the connector 11, the power supply device on the machine tool body 7 side supplies power to the motor 2 in the tool holder 1 to operate the motor 2 and the rotary cutting tool held by the tool chuck 3. 24 can be driven to rotate at high speed to perform the desired precision cutting processing. In the usage state of the tool holder 1, since the connector 11 in the fitting connection state is substantially entirely surrounded by the cylindrical cover 13, it is assumed that cutting oil or cutting dust is generated during the cutting process by the rotary cutting tool 24. Even if the foreign matter is scattered, the foreign matter is unlikely to adhere to the connector 11. In order to enhance the connector protection effect when the tool holder 1 is used, an air supply pipe 25 is connected to the cylindrical cover 13 as shown in FIG. By supplying pressured air of an appropriate pressure (for example, about 1 to 3 kg / square Cm), the air blown out from the gap between the connector 11 and the tubular cover 13 causes foreign matter to enter the tubular cover 13. Therefore, it is possible to effectively prevent foreign matter from adhering to the connector 11.

When the air supply pipe 25 is provided, when the connector socket 12A on the machine tool body 7 side is not used, that is, the tip opening 13a of the tubular cover 13 is normally closed. Even when closed, the air supply pipe 25 allows the inside of the cylindrical cover 13 to communicate with a pressure air supply source to keep the inside of the cylindrical cover 13 always higher than atmospheric pressure. Even if the normally closed lid 20 has a low sealing effect, it is possible to completely prevent foreign matter from entering the cylindrical cover 13.

[0013]

[Operation and effect of the device]

 As described above, according to the electric path connecting device for a tool holder with a built-in electric device of the present invention, when the tool holder with a built-in electric device is not used, that is, when the connector for electric path connection on the machine tool body side is not used. , The connector is completely covered in the cylindrical cover whose tip opening is closed by the normally closed lid, so the rotary cutting tool is rotationally driven by the main shaft on the machine tool body side. It is possible to completely protect the connector from the cutting oil and cutting chips scattered during normal cutting work, and prevent foreign matter such as cutting oil and cutting chips from adhering to the connector.

Therefore, when the tool holder with a built-in electric device is used, the connector on the tool holder side and the connector on the machine tool body side are normally fitted to each other due to the foreign matter adhering to the connector on the machine tool body side. It will not happen that normal electrical continuity will not occur even if it is not fitted, and the electrical device inside the tool holder and the wiring on the machine tool body side are always normal through the connector. The desired electric action can be satisfactorily carried out by conducting the electric conduction to.

Moreover, the normally closed lid of the cylindrical cover can be automatically opened by the connector on the tool holder side when the tool holder is set, and can be automatically closed when the tool holder is removed. Since there is no special artificial operation for opening and closing the opening at the tip of the tubular cover, there is no risk of erroneous operation.

In particular, when an air supply pipe for supplying air is arranged in the cylindrical cover as in the embodiment, as described above, the sealing effect of the normally closed lid in the cylindrical cover is provided. It is also possible to effectively prevent foreign matter from entering the cylindrical cover when using a tool holder with a built-in electric device that also uses a connector.

[Brief description of drawings]

FIG. 1A is a schematic vertical sectional side view with a tool holder removed, and FIG. 1B is an enlarged vertical sectional side view showing details of the essential part.

FIG. 2 is a partial vertical cross-sectional side view showing a main part with a tool holder set.

FIG. 3 is a side view, partly in vertical section, of a main part showing another embodiment with a tool holder set.

[Explanation of symbols]

 1 Tool Holder 2 High Frequency Motor (Electric Device) 7 Machine Tool Body 8 Spindle 11 Connector for Electrical Circuit Connection 12A Connector Socket Section 12B Connector Jack Section 13 Cylindrical Cover 13a Tip Opening 14 Female Terminal 16a Wiring on Machine Tool Body Side 18 Male Shaped terminal 19a Wiring on the tool holder side 20 Normally closed lid 22 Spring 25 Air supply pipe

Claims (2)

[Scope of utility model registration request] 1. A connector for electric circuit connection, which is fitted and connected to each other when the tool holder is set on the spindle, at the lateral position of the spindle of the machine tool body and the lateral position of the tool holder with an electric device. The machine tool main body side is provided with a cylindrical cover surrounding the machine tool main body side connector, and the tip end opening of the cylindrical cover is normally pushed inward by the tool holder side connector. An electric path connection device for a tool holder with a built-in electric device, in which a wiring is provided on the machine tool main body side and an electric device with a built-in tool holder is connected via the connector. 2. The electric path connection device for a tool holder with a built-in electric device according to claim 1, wherein an air supply pipe for supplying air is provided in the cylindrical cover.