JPH06182655A - Angular phase detecting device for attachment - Google Patents

Abstract

PURPOSE:To provide the detecting device of an attachment capable of eliminating the detection error of the angular phase of a gear coupling and detecting the angular phase of the attachment with high precision. CONSTITUTION:A magnetic sensor 21 is buried in the valley section or the ridge section of one tooth of a fixed side gear coupling 19A fixed to a main spindle head 2, and the transit of the valley section or the ridge section of one tooth of an index side gear coupling 19B fixed to an attachment 6 is directly detected by the magnetic sensor 21. The error of a gear train does not cause the angle detection error, and the angular phases of them can be accurately detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment indexing device. Specifically, it has a fixed-side gear coupling fixed to the ram or the spindle head and an index-side gear coupling that can be meshed with the fixed-side gear coupling and fixed to the attachment. The present invention relates to an attachment indexing device for indexing an angle.

[0002]

BACKGROUND ART Conventionally, in machine tools and the like, as an indexing device for indexing an attachment at a predetermined angle in a plane,
Japanese Patent Publication No. 4-42134 (“Machine tool with attachment indexing function”) is known. Therefore, the structure of the publication will be described with reference to FIG. In the figure, a spindle 1 is rotatably supported by a spindle head 2, and is connected to a spindle drive motor 5 via a gear train 3 and a transmission 4. An attachment 6 is detachably attached to the spindle head 2, and a clamp shaft 7 for clamping / unclamping the attachment 6 with respect to the spindle head 2 is provided so as to be vertically movable. That is, when the clamp shaft 7 rises, the attachment 6 is clamped by the clamp piece 7A at the lower end thereof,
When the clamp shaft 7 descends, the attachment 6 is unclamped so that it can rotate with respect to the spindle head 2.
Furthermore, when the clamp shaft 7 turns 90 degrees from this state,
The attachment 6 is made detachable from the spindle head 2.

The attachment 6 includes an attachment body 11 which is detachably mounted on the spindle head 2, and a rotation transmission member 13 which is inserted into the spindle 1 and whose rotation from the spindle 1 is transmitted via a key 12. , An intermediate shaft 14 rotatably supported by the attachment body 11 and rotating together with the rotation transmitting member 13, and a rotation of the intermediate shaft 14 rotatably supported by the attachment body 11 and transmitted through bevel gears 15A, 15B. It is composed of an attachment main shaft 16 to be attached. A tool 17 is detachably attached to one end of the attachment spindle 16. The intermediate shaft 14 is arranged on the axis of the main shaft 1, and the attachment main shaft 16 is arranged on the intermediate shaft 1.
It is arranged at right angles to the axis of 4.

Between the attachment body 11 and the rotation transmission member 13, a pair of rotation transmission gears 18A and 18B mesh with each other when the attachment 6 is unclamped.
Is provided. Further, between the spindle head 2 and the attachment body 11, a curbic coupling 19 is provided which meshes with each other when the attachment 6 is clamped. The curbic coupling 19 includes a fixed side gear coupling 19A fixed to the spindle head 2 and an index side gear coupling 19B which is meshable with the fixed side gear coupling 19A and fixed to the attachment 6.
It consists of and. The gear train 3 has a spindle 1
An encoder 20 for indirectly detecting the rotation indexing angle of the attachment 6 by detecting the angular position of is attached.

Therefore, in indexing the attachment 6, first, the attachment 6 is unclamped. Then, since the attachment main body 11 is lowered, the engagement of the curvic coupling 19 is disengaged, and
The pair of rotation transmission gears 18A and 18B are in mesh with each other. When the spindle drive motor 5 is rotated in this state, the spindle 1 is rotated via the transmission 4 and the gear train 3. Then, as a result of the rotation transmitting member 13 rotating together with the rotation of the main shaft 1, a pair of rotation transmitting gears-18A,
The attachment body 11 is rotated with respect to the spindle head 2 via 18B. During this time, the indexing angle data of the attachment body 11 stored in the memory is compared with the signal from the encoder 20, and when both match, the rotation of the spindle drive motor 5 is stopped.

After this, the attachment 6 is clamped. Then, since the attachment body 11 is raised, the curvic coupling 19 is meshed with the attachment 6 to be integrally fixed to the spindle head 2, and the pair of rotation transmission gears 18A and 18B are disengaged from each other. The rotation of 1 is transmitted only to the intermediate shaft 14. That is,
Since only the attachment spindle 16 is rotated, machining is performed by the tool 17 in this state.

[0007]

However, in the indexing device having the structure described above, the attachment 6 is attached to the spindle head 2.
Coupling for positioning the car at a predetermined angle 19
And the encoder 20 for detecting the angular phase of the curvic coupling 19 are separated from each other, that is, they are separated from each other by interposing the gear train 3 or the like in the middle, so that the error in the gear train 3 is an angle. There was a detection error, and there were cases where the engagement of the curvic coupling 19 could not be carried out smoothly. In addition, the control circuit is complicated because a signal from the encoder 20 is compared with the indexing angle data of the attachment body 11 stored in the memory, and a circuit for stopping the spindle drive motor 5 when the two coincide with each other is required. There was also the drawback of doing so.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, eliminate the detection error of the angular phase of the gear coupling, and accurately attach the attachment to a predetermined angle within a plane. Is to provide an indexing device of.

[0009]

Therefore, in order to solve the conventional problems, the attachment indexing device of the present invention has the following problems.
It has the following configuration. That is, it has a fixed-side gear coupling fixed to the ram or the spindle head, and an index-side gear coupling that can be meshed with the fixed-side gear coupling and fixed to the attachment, and the fixed-side gear coupling is fixed to the fixed-side gear coupling. An attachment indexing device for indexing the attachment to a predetermined angle in a plane by detecting a rotation angle of the indexing side gear coupling, wherein the rotation angle detecting means is at least one of the fixed side gear couplings. The non-contact sensor is embedded in the troughs or peaks of the teeth and detects the troughs or peaks of one tooth of the indexing side gear coupling in a non-contact manner.

[0010]

[Operation] When indexing the attachment, the attachment is rotated with respect to the ram or the spindle head. Then, the non-contact sensor embedded in the one tooth valley or the crest of the fixed side gear coupling detects the passage of the one tooth trough or the crest of the index side gear coupling in a non-contact manner, The detection signal can be used to accurately index the indexing gear coupling with respect to the fixed gear coupling at a predetermined angle within a plane. Therefore, the attachment can be accurately indexed to the ram or the spindle head at a predetermined angle in the plane.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the following description, the same components as those in FIG. 4 described above will be denoted by the same reference numerals, and the description thereof will be omitted or simplified. FIG. 1 shows a part of a device in which the attachment indexing device of this embodiment is applied to the curvic coupling 19 of FIG. In the figure, the curvic coupling 19 of this embodiment includes a fixed side gear coupling 19A fixed to the spindle head 2 and an index side fixed to the attachment 6 and meshable with the fixed side gear coupling 19A. It is composed of a gear coupling 19B. These gear couplings 19
Each of A and 19B has a plurality of teeth equidistantly formed on one end face of a ring shape so that they can mesh with each other.

Non-contact for detecting the valley or peak of one tooth of the fixed side gear coupling 19A without contacting the valley or peak of the tooth, here the peak. A magnet sensor 21 as a sensor is embedded. The magnetic sensor 21 is formed of a magnetoresistive element and a permanent magnet, and has a structure in which a change in magnetic flux occurs when an object to be measured passes and an AC voltage is generated in the converter. Here, since the index side gear coupling 19B is disposed so as to face the index side gear coupling 19B, the index side gear coupling 1
The magnetic flux changes every time one tooth of 9B passes, and an AC voltage is generated in the converter. For example, in FIG.
A signal having a waveform shown in (A) or (B) is generated.

FIG. 3 shows a control circuit for controlling the spindle drive motor 5. In the figure, 31 is an encoder for detecting the rotation angle of the spindle drive motor 5 via bevel gears 32A, 32B, 33 is a motor drive circuit, 3
Reference numeral 4 is a sequence controller, and 35 is an NC device.
The motor drive circuit 33 compares the spindle index position data stored in the sequence controller 34 with the rotation angle data of the spindle drive motor 5 detected by the encoder 31, and when both match, provisional indexing is completed. A comparison circuit 36 that outputs a signal is provided.

The sequence controller 34 includes an A / D converter 41 for converting an output signal from the magnet sensor 21 into a digital signal, and a peak value data of the output signal from the magnet sensor 21 as a pulse number from the outside. The peak value data memory 42 capable of setting and storing is compared with the peak value data of the peak value data memory 42 and the output from the A / D converter 41, and when the both do not match, the error amount of both is output. At the same time, a comparison circuit 43 that outputs an index completion signal when the two match, a command value memory 44 that stores the spindle index position data, and the NC
A command circuit 45, which outputs a spindle operation command and a spindle fixed position stop command to the motor drive circuit 33 based on a command from the device 35, and transfers spindle index position data to the command value memory 44, and the comparison. A correction circuit 46 is provided for correcting the amount of error from the circuit 43 for each pulse for a predetermined time and for correcting the spindle index position data of the command value memory 44.

Next, the operation of this embodiment will be described.
When indexing the attachment 6, the NC device 3
Based on the command from 5, the spindle circuit index position data is transferred from the command circuit 45 to the command value memory 44. Further, the attachment 6 is unclamped. Then, since the attachment body 11 is lowered, the meshing of the curvic coupling 19 is disengaged, and the pair of rotation transmission gears-18
A and 18B are in mesh with each other. At this time, the spindle fixed position stop command is issued from the command circuit 45 to the motor drive circuit 33.
The motor drive circuit 33 rotates the spindle drive motor 5 at a low speed. When the spindle drive motor 5 rotates, the spindle 1 rotates via the transmission 4 and the gear train 3. Then, as the main shaft 1 rotates, the rotation transmitting member 13 also rotates. As a result, the pair of rotation transmitting gears-18A, 1A
The attachment body 11 is rotated with respect to the spindle head 2 via 8B. While the spindle drive motor 5 is rotating, the rotation angle of the spindle drive motor 5 is detected by the encoder 31, and the passage of the teeth of the index side gear coupling 19B is detected by the magnet sensor 21.

During this period, the comparison circuit 36 compares the rotation angle data of the spindle drive motor 5 detected by the encoder 31 with the spindle index position data of the command value memory 44, and when they match, a temporary index completion signal. Is output. The provisional indexing completion signal stops the transfer of the spindle indexing position data from the command circuit 45 to the command value memory 44 and starts the comparison circuit 43. In the comparison circuit 43, the detection signal from the magnetic sensor 21 given through the A / D converter 41 and the peak value data stored in the peak value data memory 42 are provided on condition that the provisional indexing completion signal is given. Compare. At the time when the detection signal and the peak value data do not match, the error amount is added / subtracted to / from the spindle index position data of the command value memory 44 through the correction circuit 46. Eventually, when the detection signal and the peak value data match, the comparison circuit 43 gives the indexing completion signal to the command circuit 45. Then, the command circuit 45 gives a completion signal to the NC unit 35, and based on this, N
The rotation of the spindle drive motor 5 is stopped by a command from the C device 35.

After this, the attachment 6 is clamped. Then, since the attachment main body 11 rises, the curvic coupling 19 is meshed and the attachment 6 is fixed to the spindle head 2, and the pair of rotation transmission gears 18A and 18B are disengaged from each other to rotate the spindle 1. It is transmitted only to the intermediate shaft 14. That is, since only the attachment spindle 16 is rotated, the machining with the tool 17 is performed in this state.

Therefore, according to the present embodiment, the magnet sensor 21 is embedded in the valley portion or the mountain portion of one tooth of the fixed side gear coupling 19A fixed to the spindle head 2, and the attachment 6 is attached to the attachment 6 by this magnet sensor 21. Since the passage of the valley or the peak of one tooth of the fixed index side gear coupling 19B is directly detected, the error of the gear train does not become the angle detection error as in the conventional case, and both The angle phase can be accurately detected.

Therefore, the gear couplings 19A, 1
Since the crests of the teeth of 9B do not mesh with each other, smooth meshing can be ensured. Moreover, since the magnet sensor 21 only needs to be embedded in the troughs or peaks of one tooth of the fixed side gear coupling 19A, the structure can be simplified and the conventional encoder can be eliminated, so that the circuit configuration is also reduced. There is an advantage that it can be simplified.

In addition, in the above embodiment, one magnet sensor 21 is embedded in the valley portion or the mountain portion of one tooth of the fixed side gear coupling 19A. However, on the side opposite to this magnet sensor 21, the fixed side gear cup is formed. Another magnet sensor may be embedded in the valley or mountain of one tooth of the ring 19A, and the position of the index side gear coupling 19B may be indexed based on the output signals from both magnet sensors 21. . Further, not only the magnet sensor but also a light emitter and a light receiver are provided on the fixed side gear coupling 19A,
The light from the light emitting device may be applied to the indexing side gear coupling 19B, and the reflected light may be received by the light receiving device to detect the passage of the teeth.

In the above embodiment, the spindle drive motor 5
The rotation angle of is detected by the encoder 31 and the output is compared with the spindle index position data to roughly determine the spindle 1. However, the output from the magnet sensor 21 is counted, and the count number and the spindle index are counted. The spindle 1 may be indexed at a predetermined angle by comparing it with position data.

[0022]

As described above, according to the attachment indexing device of the present invention, the teeth of the indexing side gear coupling are directly detected by the non-contact sensor embedded in the fixed side gear coupling, so that the angular positioning is performed. The error can be eliminated and the attachment can be indexed with high accuracy.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing a signal waveform obtained from the magnet sensor in the above-mentioned embodiment.

FIG. 3 is a block diagram showing a control circuit in the embodiment.

FIG. 4 is a sectional view showing a conventional indexing device.

[Explanation of symbols]

 2 Spindle head 6 Attachment 11 Attachment body 19 Curbic coupling 19A Fixed side gear coupling 19B Indexing side gear coupling 21 Magnet sensor

Claims (2)

[Claims] 1. A fixed-side gear coupling having a fixed-side gear coupling fixed to a ram or a spindle head, and an index-side gear coupling capable of engaging with the fixed-side gear coupling and fixed to an attachment. In the attachment indexing device for indexing the attachment to a predetermined angle in a plane by detecting the rotation angle of the indexing side gear coupling with respect to the coupling, the rotation angle detecting means is the fixed side gear coupling. Of the index side gear coupling is a non-contact sensor that detects the valley or peak of one tooth of the index-side gear coupling in a non-contact manner. . 2. The non-contact sensor according to claim 1,
An attachment indexing device characterized by being a magnet sensor composed of a magnetoresistive element and a permanent magnet.