JPH09201738A - Machine tool collision prevention device - Google Patents

Abstract

The present invention relates to a machine tool for preventing a spindle sleeve or an attachment connected to a spindle end of a machine tool such as a machining center from colliding with a workpiece, a mounting jig or the like. It is an object of the present invention to provide a collision prevention device having high versatility and a highly sensitive collision prevention device that does not limit the collision direction. A contact sensing member disposed on a spindle sleeve of a machine tool or an attachment connected to a spindle end, and a swinging member disposed near the contact sensing member and swinging in association with a displacement of the contact sensing member. Contact detection means having a detection means for detecting the swing of the moving member and outputting a contact signal, and control for inputting the contact signal from the contact detection means and operating the machine tool in a preset operating state And means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collision prevention of a machine tool for preventing a spindle sleeve or an attachment connected to a spindle end of a machine tool such as a machining center from colliding with a workpiece, a mounting jig or the like. Regarding the device.

[0002]

2. Description of the Related Art Generally, a machine tool such as a machining center which is automatically controlled by an NC device is used for machining a metal such as an automobile gear case and a press die. Sometimes it is driven unmanned. And during unmanned driving, N due to external noise
An unexpected situation such as a malfunction of the C device or a defective attachment of the workpiece to the table may occur. Conventionally, the spindle sleeve of the machine tool or the attachment or the like arranged at the spindle end is
In order to prevent collision with a work piece, a mounting jig, or the like, for example, Japanese Utility Model Laid-Open No. 63-182836, JP-A-5-16
A collision prevention device disclosed in Japanese Patent No. 9342 or Japanese Patent Laid-Open No. 7-251353 is known.

FIG. 8 is a schematic view of the above-mentioned actual development 63-18283.
The collision preventing device disclosed in Japanese Patent No. 6 is disclosed in which the workpiece W is provided at the end of the spindle 11 and at the tip.
An arbor 13 to which a tool T for cutting is fixed is attached. A contact detection unit 19 having an electrode 17 at its tip is arranged in the arbor 13 in the lateral direction A.

The workpiece W and the electrode 17 are electrically insulated from each other, and a current is supplied to the workpiece W and the electrode 17 from the controller 15. Then, the arbor 13 is in the lateral direction A.
When the electrode 17 comes into contact with the work W, the electrode 17 and the work W are electrically connected to each other, and the controller 15 stops the operation of the machine tool.

FIG. 9 shows the above-mentioned Japanese Unexamined Patent Publication No. 5-169342.
1 shows a collision prevention device disclosed in Japanese Patent Publication No. JP-A-2003-264, in which a tool holder 23 to which a tool T for cutting a workpiece W is fixed is attached to the end of a spindle sleeve 21. . An annular protection ring 25 is arranged on the outer peripheral surface of the tool holder 23. Spindle sleeve 2
A microphone 27 is arranged in the vicinity of 1, and the spindle sleeve 2
When 1 moves and the protection ring 25 collides with the workpiece W, the protection ring 25 is broken and a crushing sound is generated.

When this crushing sound is input to the microphone 27,
The operation of the machine tool is stopped by the control device. FIG.
Indicates a collision prevention device disclosed in the above-mentioned JP-A-7-251353. In this collision prevention device,
A tool holder 33, to which a tool T for cutting the workpiece W is fixed, is attached to the end of the spindle sleeve 31.

The workpiece W and the spindle sleeve 31 are electrically insulated, and the workpiece W and the spindle sleeve 31 are
Electric current is supplied to each of them from the control device. Also,
On the outer peripheral surface of the spindle sleeve 31 and the shank S of the tool T,
The insulating material 35 is arranged, and when the spindle sleeve 31 moves and the insulating material 35 collides with the workpiece W, the insulating material 35 is peeled off, the spindle sleeve 31 and the workpiece W are electrically connected, and the control device operates the machine tool. Is stopped.

[0008]

However, in the collision prevention device disclosed in Japanese Utility Model Laid-Open No. 63-182836, the contact detection unit 19 is arranged on the arbor 13, so that a dedicated tool for each tool T is provided. There is a problem that it is necessary to manufacture the arbor 13 and it costs a lot of money, and the management of the arbor 13 becomes complicated.

Further, since the contact detector 19 is attached in the lateral direction A, the collision is detected only when the contact detector 19 collides in the direction in which the contact detector 19 is directed, and the collision direction is limited to a single direction. There was a problem. On the other hand, in the collision prevention device disclosed in the above-mentioned JP-A-5-169342, the collision is detected by detecting the crushing sound generated when the protection ring 25 attached to the tool holder 23 collides with the workpiece W. Therefore, it is very difficult to detect the crushing sound of the protection ring 25 due to a collision in a high noise environment factory where a large number of machine tools are operated, and it is difficult to obtain high reliability. It was

Further, since the protection ring 25 is destroyed once it is used, the protection ring 25 cannot be reused, and it is necessary to replace the protection ring 25 each time a collision occurs, which results in a great cost. There was a problem of this. Further, in the collision prevention device disclosed in Japanese Patent Laid-Open No. 7-251353 mentioned above, the tool holder 33 on which the insulating material 35 is formed collides with the workpiece W, and the insulating material 35 is peeled off. Since the collision is detected by the electrical connection with the tool holder 33, the insulating material 35 is peeled off after one collision and cannot be reused, resulting in a large cost.

When the insulating material 35 is formed on the shank or collet of the tool T, the dimensions change depending on the film thickness of the insulating material 35. Therefore, standard products that are normally used cannot be used, and the versatility is remarkably improved. There was a problem that the loss cost would rise significantly. Furthermore, the above-mentioned actual exploitation 63
In the collision prevention devices disclosed in Japanese Patent No. 182836 and Japanese Patent Application Laid-Open No. 7-251353, the collision is detected based on the presence / absence of electrical conduction between the workpiece W and the spindles 11 and 31, so that the workpiece W is not detected. There is a problem in that it is necessary to electrically insulate the spindles 11 and 31 from each other electrically, which significantly increases the manufacturing cost of the machine tool.

Further, when it is used for a machine tool which is already installed and operated, there is a problem in that it needs to be extensively modified and the versatility is greatly impaired. The present invention has been made in order to solve such a conventional problem, and an object of the present invention is to provide a high-sensitivity collision prevention device for a machine tool which has high versatility and whose collision direction is not limited.

[0013]

According to a first aspect of the present invention, there is provided a collision preventing device for a machine tool, wherein a contact sensing member is disposed on an attachment connected to a spindle sleeve or a spindle end of the machine tool, and a vicinity of the contact sensing member. And a contact detecting means for detecting displacement of the contact sensing member and outputting a contact signal, and inputting the contact signal from the contact detecting means, modulating the contact signal into a wireless signal and transmitting the wireless signal to the atmosphere. Transmitting means for transmitting a signal, receiving the wireless signal from the transmitting means, receiving means for demodulating the wireless signal into the contact signal and outputting the contact signal, and inputting the contact signal from the receiving means, And a control means for operating the machine tool in a preset operating state.

According to a second aspect of the present invention, there is provided a collision prevention device for a machine tool, wherein a contact sensing member is disposed on an attachment connected to a spindle sleeve or a spindle end of the machine tool, and a contact sensing member is disposed near the contact sensing member. Contact detection means provided with a detection means for detecting the swing of the swinging member swinging in association with the displacement of the sensing member and outputting a contact signal, and the contact signal input from the contact detecting means Control means for operating the machine in a preset operating state.

A collision prevention device for a machine tool according to a third aspect is the collision prevention device for a machine tool according to the second aspect.
The contact detecting means has one end connected to the contact sensing member and the other end having a swinging part that spreads forward, and a swinging part of the swinging member. A supporting member having a supporting portion, a floating member arranged on the side of the swinging portion of the swinging member and moved by swinging of the swinging member, and the supporting member being fixed, the floating member is movable. A holding member having a guide portion for guiding to, and a detection unit built in the holding member for detecting a movement of the floating member and outputting a contact signal.

A machine tool collision prevention device according to a fourth aspect is the machine tool collision prevention device according to the second or third aspect, wherein the detection means is a limit switch. The collision prevention device for a machine tool according to claim 5 is the collision prevention device for a machine tool according to claim 4, wherein the oscillating portion of the oscillating member has a tapered shape that widens toward the front. Characterize.

A collision prevention device for a machine tool according to a sixth aspect is the collision prevention device for a machine tool according to any one of the third to fifth aspects, wherein the collision prevention device is provided between the swing member and the holding member. , A first urging member for urging the swinging member toward the contact sensing member is disposed, and the floating member is biased toward the swinging member side between the floating member and the detecting means. A second urging member is arranged.

A machine tool collision prevention device according to a seventh aspect is the machine tool collision prevention device according to any one of the third to sixth aspects, wherein the contact sensing member has an annular shape or an arc shape. It is characterized by doing. The collision prevention device for a machine tool according to claim 8 is the collision prevention device for a machine tool according to claim 7, wherein the contact sensing member is
It is characterized in that it has a pair of projecting connecting portions which are connected to the swing member of the contact detecting means and are arranged to face each other.

A collision preventing device for a machine tool according to a ninth aspect is the collision preventing device for a machine tool according to any one of the third to eighth aspects, in which the contact signal is output from the detecting means of the contact detecting means. And transmitting means for modulating the contact signal into a wireless signal and transmitting the wireless signal to the atmosphere, and receiving the wireless signal from the transmitting means, demodulating the wireless signal into the contact signal, and controlling the control means. And receiving means for outputting the contact signal.

A collision prevention device for a machine tool according to a tenth aspect is the collision prevention device for a machine tool according to the first or ninth aspect, wherein the transmitting means includes a transmitting antenna for transmitting the radio signal to the atmosphere. The receiving means has a receiving antenna for receiving the radio signal. The collision prevention device for a machine tool according to claim 11, wherein in the collision prevention device for a machine tool according to claim 10, the contact sensing member is made of a conductive material and transmits the wireless signal to the atmosphere. To do.

(Operation) In the collision preventing device for a machine tool according to claim 1, when the contact sensing member comes into contact with the workpiece and is displaced, the displacement of the contact sensing member is detected by the contact detecting means, and the contact signal is sent to the transmitting means. Is output. Then, the contact signal is modulated into a wireless signal by the transmitting means, the wireless signal is transmitted to the atmosphere, this wireless signal is received by the receiving means, the received wireless signal is demodulated into a contact signal, and the contact signal is sent to the control means. Is output, and the control means operates the machine tool in a preset operating state.

In the collision preventing device for a machine tool according to a second aspect, when the contact sensing member comes into contact with the workpiece and is displaced, the swinging member of the contact detecting means is swung in conjunction with the displacement of the contact sensing member. The swing is detected by the detection means, a contact signal is output to the control means, and the control means operates the machine tool in a preset operation state.

According to another aspect of the present invention, there is provided a collision preventing device for a machine tool, wherein the swinging portion is swingably supported by the supporting portion of the supporting member, and the swinging member is guided by the guide portion of the holding member. The floating member is moved, the movement is detected by the detection means, and a contact signal is output to the control means. In the collision preventing device for a machine tool according to the fourth aspect, the movement part of the limit switch is actuated by the movement of the floating member, and the contact signal is output to the control means.

In the collision preventing device for a machine tool according to a fifth aspect, the swinging portion of the swinging member is formed in a tapered shape. In the collision prevention device for a machine tool according to claim 6, the swing member is biased toward the contact sensing member by the first biasing member, and the floating member is biased toward the swing member by the second biasing member. To be done.

In the collision preventing device for a machine tool according to claim 7, the contact sensing member is formed in an annular shape or an arc shape.
In the collision preventing device for a machine tool according to an eighth aspect of the present invention, the pair of connecting portions of the contact sensing member, which are arranged to face each other, are connected to the swing member of the contact detecting means. In the collision prevention device for a machine tool according to claim 9, the contact signal is modulated into a wireless signal by the transmitting means, transmitted to the atmosphere, the wireless signal is received by the receiving means, and the received wireless signal becomes the contact signal. It is demodulated and a contact signal is output to the control means.

In the collision preventing device for a machine tool according to claim 10, a radio signal is transmitted from the transmitting antenna to the atmosphere,
This radio signal is received by the receiving antenna. In the collision preventing device for a machine tool according to claim 11, a wireless signal is transmitted from the contact sensing member made of a conductive material to the atmosphere.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of a machine tool collision prevention device according to the present invention.
Indicates a spindle unit of a machining center. A table 54 to which the workpiece W is fixed by a mounting jig J is arranged below the spindle unit 51. A cylindrical spindle sleeve 55 made of steel is arranged in the spindle unit 51.

Inside the main shaft sleeve 55, a cylindrical main shaft 57 made of steel is rotatably arranged via a bearing 59. A tapered spindle hole 57b is formed in the spindle end 57a of the spindle 57. An attachment 61 is attached to the end of the spindle sleeve 55. The attachment 61 is made of steel and has a conical tubular shape at its center portion, a fixed side to the main shaft sleeve 55 has the same cylindrical shape as the main shaft sleeve 55, and an opposite side has a cylindrical attachment body 63 having a smaller diameter than the fixed side. It is arranged.

The attachment body 63 is fixed to the end of the spindle sleeve 55 with a bolt 65. Inside the attachment body 63, a cylindrical attachment shaft 67 made of steel is rotatably disposed via a bearing (not shown). Attachment shaft 67
A tapered connecting portion 67a is formed at the end portion of the main shaft 57 side.

On the other hand, the connecting portion 67 of the attachment shaft 67
A tapered attachment shaft hole 67b is formed at the end opposite to a. The connecting portion 67a of the attachment shaft 67 is fitted and connected to the main shaft hole 57b of the main shaft 57. On the other hand, in the attachment shaft hole 67b,
The tapered shank 69a of the tool holder 69 is fitted and connected.

A tool T such as an end mill for processing the workpiece W is attached to the tip of the tool holder 69. Then, on the tip side of the attachment body 63, a circular stylus 7 made of metal wire or plastic is used.
1 is arranged so as to surround the outer periphery of the attachment body 63.

The stylus 71 is formed with a pair of facing connecting portions 71a which project upward.
The connecting portion 71 a is connected to a swing member 105, which will be described later, of the switch box 73 fixed to the attachment body 63. The switch box 73 includes a transmitter 7 attached to the main shaft 57 side of the attachment body 63.
5 is connected.

The transmitter 75 includes an attachment body 63.
An annular transmitting antenna 77 made of a metal wire that surrounds the outer periphery of is connected. A control device 81 to which a receiving antenna 79 is connected is connected to the NC device 78 that controls the machining center. FIG. 2 shows the details of the switch box 73 described above, and in the figure, reference numeral 91 denotes a rectangular switch box body.

The switch box body 91 is made of metal or plastic and has an opening 9 that is open on one side.
1a. A cylindrical sliding port 91b is formed on the lower end surface of the switch box body 91. A cylindrical floating member 93 made of metal or plastic is movably fitted in the sliding port 91b.

A ring-shaped seal ring 95 made of rubber is fitted on the center of the floating member 93. A limit switch 97 is arranged on the upper end side of the floating member 93. The limit switch 97 is connected to the transmitter 75 arranged in the attachment body 63 via the terminal block 99.

Between the floating member 93 and the limit switch 97, a first coil spring 101 for urging the floating member 93 downward is arranged. A rectangular support member 103 having an open surface made of metal is connected to the lower end of the switch box body 91. On the lower end surface of the support member 103, a taper-shaped taper port 103a that expands upward is formed.

A tapered rocking portion 105a formed in the central portion of the rocking member 105 and extending upward is fitted in the taper port 103a. A columnar protrusion 105b is formed on the upper end side of the swing portion 105a. The protruding portion 105b is in contact with the lower end surface of the floating member 93. A second coil spring 107 that urges the swinging member 105 downward is fitted on the protruding portion 105b.

A cylindrical boss 105d having a connecting port 105c on the lower end surface is formed on the lower end side of the swinging portion 105b. The connecting portion 71a of the stylus 71 is inserted into the connecting port 105c and is fixed by the screw 109.
A lid member 11 made of metal is inserted into the opening 91a of the switch box body 91 via a packing 111 made of rubber.
3 is attached.

In the above-described collision preventing device for a machine tool, when the stylus 71 of the spindle unit 51 comes into contact with the workpiece W and the position of the stylus 71 is displaced due to, for example, a runaway of the machine tool, the connecting portion 71a of the stylus 71 is displaced. The swinging member 105 connected to is swinging or moved in the lateral direction or the axial direction.

Then, the protruding portion 105b of the swinging member 105
Is oscillated or moved in the same manner as the oscillating member 105, and the floating member 93 abutting on the protruding portion 105b is moved upward as shown in FIG. Then, the upper end of the floating member 93 contacts the limit switch 97, and the limit switch 97 outputs a contact signal to the transmitter 75.

The contact signal is modulated into a wireless signal by the transmitter 75, and the wireless signal is transmitted from the transmitting antenna 77.
This wireless signal is received by the receiving antenna 79, and the received wireless signal is output to the control device 81. And
The control device 81 demodulates the wireless signal into a contact signal,
An emergency stop command is output to the C device 78, and the operation of the machine tool is stopped.

In the machine tool collision prevention device constructed as described above, the swing member 105 that swings in conjunction with the displacement of the stylus 71 arranged on the attachment body 63 connected to the spindle sleeve 55 is provided. This rocking member 10
Since the swing of 5 is detected and the contact signal is output to the control device 81, the contact signal can be output without being limited to the displacement direction of the stylus 71, and the collision direction is not limited,
Collisions can be detected with higher sensitivity than before, and versatility can be greatly improved.

Further, in the above-described collision preventing apparatus for machine tools, since the movement of the floating member 93 which moves in association with the swing of the swing member 105 is detected, the swing member 105 swings with high sensitivity. The motion can be detected, and the contact signal can be reliably output. Further, in the above-described collision preventing device for a machine tool, since the movement of the floating member 93 is detected by the limit switch 97, it is possible to output the contact signal with an inexpensive and highly reliable component.

Further, in the above-described collision preventing device for a machine tool, since the rocking portion 105a of the rocking member 105 is formed in a tapered shape, it can rock reliably in response to displacement from any direction. Further, in the above-described collision preventing device for a machine tool, the swinging member 105 is biased by the second coil spring 107, and the floating member 93 is biased by the first coil spring 101 toward the side where the contact signal is not detected. Therefore, when the stylus 71 is not displaced, even if the spindle unit 51 moves, the swing member 105
The floating member 93 and the floating member 93 can be reliably positioned at a position where no contact signal is detected.

Further, in the above-described collision preventing device for a machine tool, since the stylus 71 is formed in an annular shape, the workpiece W
The contact with the stylus 71 can be reliably detected in a wide range. Further, in the above-described collision preventing device for a machine tool, since the pair of connecting portions 71a is formed so as to face the stylus 71, the stylus 71 can be stably arranged and the workpiece W can be reliably contacted with the stylus 71. It can be detected by sex.

Further, in the above-mentioned collision preventing device for machine tools, the control device 8 transmits the contact signal to the atmosphere by radio signal.
Since 1 is input, complicated wiring is not required and versatility can be greatly improved. Further, in the above-mentioned collision prevention device for machine tools, since the wireless signal is transmitted from the transmitting antenna 77 and is received by the receiving antenna 79, the wireless signal can be received in a wide range, and the control device 81 can receive the signal reliably. A contact signal can be input to the.

FIG. 4 shows a second embodiment of the machine tool collision prevention device of the present invention. In this embodiment, the limit switch 97 and the control device 81 are electrically connected by an electric wire 114. There is. In addition, other than this,
Since the configuration is the same as that of the first embodiment, the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

In the collision prevention device for machine tools of this embodiment, the contact signal from the limit switch 97 is transmitted by the electric wire 114.
Is transmitted to the control device 81. In the collision prevention device for a machine tool of this embodiment, since the contact signal is transmitted by the electric wire 114, the influence of noise can be effectively prevented. In the above-described embodiment, an example in which the present invention is applied to a vertical axis type machining center has been described, but the present invention is not limited to such an embodiment, and a horizontal axis type machining as shown in FIG. It can also be applied to machines.

Further, in the above-described embodiment, an example in which the connecting portion 71a is formed on the annular stylus 71 as shown in FIG. 6 has been described, but the present invention is not limited to this embodiment, and for example, As shown in FIG. 7, the connecting portion 115a may be formed on the stylus 115 having an arc shape such as a semicircle. Further, in the above-described embodiment, an example in which the stylus 71 is arranged on the attachment 61 has been described, but the present invention is not limited to this embodiment, and the spindle sleeve 55 is adapted to the usage pattern of the machine tool.
A stylus may be placed on.

Further, in the above-described embodiment, the example in which the stylus 71 is arranged at one place has been described, but the present invention is not limited to this embodiment, and the workpiece W is not limited thereto.
You may arrange | position several stylus according to the shape of.
Further, in the above-described embodiment, the example in which the limit switches 97 are incorporated in the switch boxes 73 arranged to face each other has been described, but the present invention is not limited to such an embodiment, and any one of the switch boxes may be used. The limit switch 97 may be built in only the box 73.

In the above-mentioned embodiment, an example in which a radio signal is transmitted from the transmitting antenna 77 has been described.
The present invention is not limited to such an embodiment, and the stylus 71 may transmit a wireless signal.

Further, in the above-described embodiment, the example in which the movement of the floating member 93 is detected by the limit switch 97 has been described, but the present invention is not limited to such an embodiment, and a pressure sensor, an infrared sensor or the like may be used. The movement of the floating member 93 may be detected. Further, in the above-described embodiment, an example in which the rocking portion 105a of the rocking member 105 is formed in a tapered shape has been described, but the present invention is not limited to this embodiment and may be formed in a spherical shape. good.

[0054]

As described above, in the collision preventing device for a machine tool according to the first aspect, the displacement of the contact sensing member arranged on the spindle sleeve or the attachment connected to the spindle end is detected and the contact signal is transmitted wirelessly. Since the signal is transmitted to the control device, the contact signal can be output without being limited to the displacement direction of the contact sensing member, and the collision direction is not limited.
Collisions can be detected with higher sensitivity than before, and versatility can be greatly improved.

In the collision preventing device for a machine tool according to a second aspect of the present invention, there is provided a swing member that swings in conjunction with the displacement of the contact sensing member arranged on the spindle sleeve or the attachment connected to the spindle end. Since the swing of the moving member is detected and the contact signal is output to the control device, the contact signal can be output regardless of the displacement direction of the contact sensing member,
The collision direction is not limited, the collision can be detected with higher sensitivity than before, and the versatility can be greatly improved.

In the collision preventing device for a machine tool according to a third aspect of the present invention, since the movement of the idle member that moves in association with the swing of the swing member is detected, the swing member can be swung with high sensitivity. It can be detected and the contact signal can be reliably output. In the collision prevention device for a machine tool according to claim 4,
Since the movement of the floating member is detected by the limit switch, it is possible to output the contact signal with inexpensive and highly reliable parts.

In the collision preventing device for a machine tool according to the fifth aspect, since the rocking portion of the rocking member is formed in a tapered shape, it is possible to rock reliably in response to displacement from any direction. In the collision prevention device for a machine tool according to claim 6,
Since the swing member is biased by the first biasing member and the floating member is biased by the second biasing member toward the side where the contact signal is not detected, the swing member is shaken when the contact sensing member is not displaced. It is possible to reliably position the moving member and the floating member at a position where no contact signal is detected.

In the collision preventing device for a machine tool according to the seventh aspect, since the contact sensing member is formed in an annular shape or an arc shape, it is possible to reliably sense the contact of the workpiece with the contact sensing member in a wide range. In the collision preventing device for a machine tool according to claim 8, since the pair of connecting portions are arranged so as to face the contact sensing member, the contact sensing member can be stably arranged, and the contact of the workpiece with the contact sensing member is prevented. It can be detected with high reliability.

In the collision preventing device for a machine tool according to claim 9, since the contact signal is transmitted to the atmosphere by a radio signal and inputted to the control device, complicated wiring is not required and the versatility is greatly improved. Can be improved. In the collision preventing device for a machine tool according to claim 10, since the wireless signal is transmitted from the transmitting antenna and received by the receiving antenna, the wireless signal can be received in a wide range and the control device can be reliably contacted. A signal can be input.

In the collision preventing device for a machine tool according to the eleventh aspect, since the wireless signal is transmitted from the contact sensing member, it is not necessary to install the transmitting antenna, and the cost and the mounting space can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a machine tool collision prevention device of the present invention.

FIG. 2 is a cross-sectional view showing details of the switch box of FIG.

FIG. 3 is a cross-sectional view showing the operation of the switch box of FIG.

FIG. 4 is a front view showing a second embodiment of the collision prevention device for a machine tool of the present invention.

FIG. 5 is a perspective view showing another embodiment of the collision prevention device for a machine tool of the present invention.

6 is a perspective view showing the stylus of FIG. 1. FIG.

FIG. 7 is a perspective view showing another shape of the stylus shown in FIG.

FIG. 8 is a front view showing a conventional collision prevention device for a machine tool.

FIG. 9 is a front view showing a conventional collision prevention device for a machine tool.

FIG. 10 is a front view showing a conventional collision prevention device for a machine tool.

[Explanation of symbols]

 55 main shaft sleeve 57a main shaft end 61 attachment 71a connecting part 77 transmitting antenna 79 receiving antenna 81 control device 93 floating member 97 limit switch 103 support member 105 rocking member 105a rocking part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Igarashi 2068-3 Ooka, Numazu City, Shizuoka Prefecture, Toshiba Machine Co., Ltd.Numazu Business Office (72) Inventor Satoshi Kumamoto 2068-3, Ooka, Numazu City, Shizuoka Toshiba Machine Co., Ltd.Numazu Business In-house (72) Inventor Noboru Uchida 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machinery Co., Ltd.Numazu office (72) Inventor Masayori Ito 2068-3, Ooka, Numazu-shi, Shizuoka Toshiba Machinery Co., Ltd.Numazu office

Claims (11)

[Claims] 1. A contact sensing member arranged in an attachment connected to a spindle sleeve or a spindle end of a machine tool, and a contact sensing member disposed in the vicinity of the contact sensing member to detect displacement of the contact sensing member and to output a contact signal. Contact detecting means for outputting, transmitting means for inputting the contact signal from the contact detecting means, modulating the contact signal into a wireless signal and transmitting the wireless signal in the atmosphere, and receiving the wireless signal from the transmitting means Then, receiving means for demodulating the wireless signal into the contact signal and outputting the contact signal, and control means for inputting the contact signal from the receiving means and operating the machine tool in a preset operating state, A machine tool collision prevention device comprising: 2. A contact sensing member arranged in a spindle sleeve of a machine tool or an attachment connected to a spindle end, and a contact sensing member disposed in the vicinity of the contact sensing member and swinging in association with a displacement of the contact sensing member. Contact detection means having a detection means for detecting the swing of the swing member and outputting a contact signal; and inputting the contact signal from the contact detection means to operate the machine tool in a preset operating state. A machine tool collision prevention device comprising: a control unit. 3. The collision preventing device for a machine tool according to claim 2, wherein the contact detecting means has one end connected to the contact sensing member, and the other end having a swinging portion that spreads forward. A support member having a support portion for swingably supporting the swing portion of the swing member; and a support member disposed on the swing portion side of the swing member and moved by swing of the swing member. A floating member, a holding member to which the support member is fixed, and a guide portion that movably guides the floating member, and a detection that is built in the holding member and that detects the movement of the floating member and outputs a contact signal A collision prevention device for a machine tool, comprising: 4. The collision prevention device for a machine tool according to claim 2, wherein the detection means is a limit switch. 5. The collision prevention device for a machine tool according to claim 4, wherein the oscillating portion of the oscillating member has a tapered shape that widens toward the forward direction. apparatus. 6. The collision prevention device for a machine tool according to claim 3, wherein the rocking member is provided between the rocking member and the holding member on the contact sensing member side. And a second urging member for urging the floating member toward the rocking member between the floating member and the detecting means. A machine tool collision prevention device characterized by the above. 7. The collision prevention device for a machine tool according to claim 3, wherein the contact sensing member has an annular shape or an arc shape. Collision prevention device. 8. The collision prevention device for a machine tool according to claim 7, wherein the contact sensing member is connected to the swing member of the contact detecting means, and a pair of projecting connecting portions arranged to face each other. A machine tool collision prevention device comprising: 9. The collision prevention device for a machine tool according to claim 3, wherein the contact signal is input from the detection means of the contact detection means, and the contact signal is converted to a wireless signal. Transmitting means for modulating and transmitting the wireless signal to the atmosphere, receiving means for receiving the wireless signal from the transmitting means, demodulating the wireless signal into the contact signal, and outputting the contact signal to the control means, A machine tool collision prevention device comprising: 10. The collision prevention device for a machine tool according to claim 1, wherein the transmitting unit transmits the wireless signal to the atmosphere, and the receiving unit receives the wireless signal. A machine tool collision prevention device, comprising: 11. The collision prevention device for a machine tool according to claim 10, wherein the contact sensing member is made of a conductive material and transmits the wireless signal to the atmosphere.