JPH0729133A - Mounting apparatus for head - Google Patents

Abstract

PURPOSE:To obtain a head mounting apparatus having a centering mechanism for a rotary drum which takes little time and is easy to adjust. CONSTITUTION:A Y-direction displacement sensor 33 is set at the front end of a mirror barrel 32 of a microscope unit 25. Moreover, an X-direction displacement sensor 35 is provided via an arm 34. The microscope unit 25 is moved through feedback control by a Y-direction actuator 37 and an X-direction actuator 39 so as to make outputs of the pair of sensors 33 and 35 proper values. The operation is repeated for every position where a magnetic head 40 is mounted on a rotary drum 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounting device, and more particularly to a mounting device for mounting a head so as to face an outer peripheral portion of a rotating body.

[0002]

2. Description of the Related Art In a helical scan type magnetic recording / reproducing apparatus such as a VTR or R-DAT, recording and / or reproduction is performed by a rotary head. The magnetic head is usually attached to a rotary drum, and a fixed guide drum is arranged below the rotary drum, and a magnetic tape is helically wound around these. By rotating the rotary drum, the magnetic head helically scans the magnetic tape for recording and / or reproduction.

Therefore, a magnetic head must be attached to the rotary drum used in the VTR or R-DAT. Therefore, conventionally, an unmounted rotating drum is attached to the main shaft portion of the mounting machine, and the rotating drum is rotated to sequentially mount a plurality of magnetic heads at predetermined positions in the circumferential direction.

[0004]

When the rotary drum is mounted on the main shaft, the rotary drum is first temporarily fixed on the main shaft, and the misalignment is gradually reduced while measuring the misalignment, and the centering is performed below the specified value. After that, the rotary drum is permanently fixed. So not only is it very time consuming,
Complete centering is not possible.

A method of centering with the inner diameter of the upper drum by a mandrel or frets can be considered, but it is disadvantageous in terms of life and maintenance. Moreover, this method has a drawback that it is weak against temperature drift. Furthermore, since the center of the outer diameter of the rotary drum must be found and installed, the concentricity accuracy is poor. In addition to this, there is also a method of rotating the rotating drum once and measuring how many times there is misalignment when rotating, but this has the disadvantage of being manual and time-consuming and inefficient.

The present invention has been made in view of the above problems, and the centering with respect to the main shaft at the time of attaching and fixing a rotating body such as a rotating drum may be rough, and the device is inexpensive and excellent in maintainability. Moreover, it is an object of the present invention to provide a head mounting device in which a rotating body can be easily mounted.

[0007]

According to the present invention, there is provided an X-direction and Y-direction displacement sensor for detecting the positions of the outer peripheral portion of a rotating body which are deviated from each other by approximately 90 °. The head mounting position is adjusted by moving the head relative to the rotating body.

[0008]

Therefore, the rotating body mounted on the main shaft is rotated to the mount position of the head, and the outer diameter of the rotating body is detected by the pair of displacement sensors in the X and Y directions at this position. The mounting position of the head is adjusted, and the head is mounted on the rotating body in a state where the head is divided into angles based on the outer diameter.

[0009]

FIG. 2 shows the overall construction of a magnetic head mounting apparatus according to an embodiment of the present invention. This apparatus includes a base 10. An exchange unit 1 having a first jig 11 and a second jig 12 mounted on a base 10.
Three are arranged. The upper drum 14 is mounted on the pair of jigs 11 and 12. The second
An upper drum fixing unit 15 for mounting the upper drum 14 on the jig 12 is provided on a side portion of the replacement unit 13. A retracting unit 16 is provided on the opposite side of the exchange unit 13.

A chuck unit 19 is arranged at the rear of the replacement unit 13. An upper drum spindle unit 20 is provided at the center of the chuck unit 19, and the chucks 2 are provided on both sides of the spindle unit 20.
1, 22 are arranged, and air cylinders 23,
It is designed to be moved by 24. A microscope unit 25 is provided on the back side of the chuck unit 19, and a screw tightening unit 26 is provided on the chuck unit 19.

An apparatus for centering and indexing the upper drum 14 mounted on the upper drum spindle unit 20 will be described with reference to FIG.
A microscope 31 is provided on the Y-direction moving table 30, and a lens barrel 32 of the microscope 31 projects so as to face the outer peripheral surface of the upper drum 14 so that the magnetic head 40 can be observed. A Y-direction displacement sensor 33 is provided on the tip side of the lens barrel 32. Further, an X-direction displacement sensor 35 is provided on the Y-direction moving table 30 via an arm 34.

The Y-direction moving table 30 is moved by a Y-direction moving actuator 37. An X-direction moving table 38 is arranged below the Y-direction moving table 30.
It is adapted to be moved by a direction moving actuator 39.

Next, a mounting operation by the above mounting device will be described. The replacement unit 13 shown in FIG. 2 is provided with a first jig 11 and a second jig 12, and the first jig 1 on which the upper drum 14 is mounted is mounted.
1 is supplied onto the upper drum spindle unit 20, and the magnetic head 40 is mounted by the screw tightening unit 26. At this time, the unmounted upper drum 14 is fixed on the second jig 12 by the fixing unit 15.

When the mounting of the magnetic head 40 on the upper drum 14 on the first jig 11 is completed, the jig 1
1 is returned to the exchange unit 13, and this exchange unit 13 is rotated 180 ° to exchange the positions of the first jig 11 and the second jig 12. Then, the unmounted drum 14 is supplied onto the spindle unit 20 together with the second jig 12. And the drum 1 on the jig 11 that has been mounted
4 is removed and new unmounted drum 1
4 is mounted on the jig 11.

The operation of mounting the magnetic head 40 on the unmounted upper drum 14 introduced into the chuck unit 19 is performed as shown in FIG. This operation adjusts the position on the upper drum 14 and attaches and fixes the magnetic head 40. Since the magnetic head 40 is temporarily fixed on the upper drum 14 in advance, the screw that is temporarily fixed is loosened by the bit 27 of the driver. Then, by the left and right air cylinders 23, 24, the chuck 2
The magnetic heads 1 and 22 are moved forward to chuck the magnetic head 40 from both sides thereof.

Next, the angle index of the magnetic head 40, the amount of protrusion, and the R balance position are adjusted. And after that, tighten the screw again with the bit 27 of the screwdriver,
The magnetic head 40 is correctly fixed on the upper drum 14. Then, after that, the chucks 21 and 22 are opened by the air cylinders 23 and 24, the upper drum 14 is rotated by 180 °, and the other magnetic head 40 is fixed on the upper drum 14 by the same adjustment.

Next, the positioning of the upper drum 14 when fixing the head 40 will be described. In the apparatus according to the present embodiment, the position of the outer peripheral side of the upper drum 14 in the Y direction and the X direction is determined by the capacity by the Y direction displacement sensor 33 and the X direction displacement sensor 35 without centering the rotary drum 14. I'm trying to detect.

As shown in FIGS. 1 and 4, the Y-direction moving actuator 37 and the X-direction moving actuator 39 move the Y-direction moving table 30 and the X-direction so that they generate proper detection outputs. The table 38 is moved. That is, the microscope unit 25 is moved with respect to the rotary drum 14. The screw tightening unit 26 is moved together with the movement of the microscope unit 25.

In this way, the screw tightening unit 26 is correctly positioned with respect to the center obtained from the outer peripheral surface of the rotating body 14. Then, in this state, the operation of fixing the magnetic head 40 is performed. The amount of protrusion of the magnetic head 40 from the outer peripheral surface of the drum 14 at this time is regulated by the microscope 31 including the lens barrel 32.

When the first magnetic head 40 is mounted at a predetermined position in the circumferential direction of the rotary drum 14, after this, as shown in FIG.
, The upper drum 14 is rotated by a predetermined angle, and the same operation as described above is performed again to move the microscope unit 25 and the screw tightening unit 26 in accordance with the outer peripheral surface of the upper drum 14 to move the screw tightening unit to the correct position. 26 is guided to fix the next magnetic head 40.

As described above, in the mounting apparatus according to the present embodiment, an error in the accuracy of angle indexing on the outer circumference of the upper drum 14 due to the misalignment of the upper drum 14 and the eccentric rotation of the main shaft unit 20 is avoided. Therefore, in the optical axis direction of the lens barrel 32 of the microscope 31, that is, in the Y direction and the X direction of 90 ° with respect to the optical axis direction, the upper drum 1 is detected by the sensors 33 and 35.
The outer circumference of 4 is detected. The microscope unit 25 and the screw tightening unit 26 are moved by the actuators 37 and 39 so that the outer circumference of the upper drum 14 and the positions of the sensors 33 and 35 are determined by the signals from the sensors 33 and 35. I am trying to let you.

According to such a method, the angle of the upper drum 14 can be accurately indexed. Further, such a method makes it possible to correctly index the upper drum 14 at any angle such as 30 °, 60 °, and 90 °.

By performing the angle indexing with the outer circumference of the upper drum 14 as a reference in this way, the centering when mounting the upper drum 14 and the rotational accuracy of the spindle unit 20 for mounting the upper drum 14 are not absolutely necessary conditions. Since the fitting accuracy is of a normal grade, no precision jig is required, and the work 14 can be easily attached and detached. For this reason, the tact time of the work can be shortened, the indexing accuracy error due to the mounting method of the upper drum 14 and the eccentric rotation can be avoided, and the workability can be improved.

As described above, in the mounting apparatus according to the present embodiment, since the microscope 31 moves and is centered, the centering when the upper drum 14 is fixed can be rough, the machine is inexpensive, and the maintainability is good. Also, handling of the upper drum 14 becomes easy. Moreover, since the displacement sensors 33 and 35, which perform high-precision detection in a non-contact manner depending on the capacitance, perform detection, high-accuracy centering is performed. Further, centering is performed only by the time when the microscope 31 moves, and it can be performed at the same time as loosening the head mounting screw, so that the cycle time can be shortened.

[0025]

As described above, the present invention is provided with the X-direction and Y-direction displacement sensors for detecting the positions of the outer peripheral portion of the rotating body which are deviated from each other by approximately 90 °. The head mounting position is adjusted by moving the head relatively. Therefore, it is not necessary to attach the rotating body with high precision. Moreover, by repeating the above operation at each head mounting position, it is possible to mount the head with high accuracy.

[Brief description of drawings]

FIG. 1 is a plan view of a mechanism for relative centering of rotating bodies.

FIG. 2 is an external perspective view showing the overall structure of a head mounting device.

FIG. 3 is an enlarged perspective view of a portion of a head mounting unit.

FIG. 4 is a plan view showing a positioning operation in the X direction.

FIG. 5 is a plan view showing a positioning operation in the X direction when the rotary drum is rotated by 180 °.

[Explanation of symbols]

 10 Base 11 First Jig 12 Second Jig 13 Replacement Unit 14 Upper Drum 15 Upper Drum Fixing Unit 16 Retracting Unit 19 Chuck Unit 20 Upper Drum Main Spindle Unit 21, 22 Chuck 23, 24 Air Cylinder 25 Microscope Unit 26 Screw Tightening unit 27 bit 30 Y direction moving table 31 Microscope 32 Lens barrel 33 Y direction displacement sensor 34 Arm 35 X direction displacement sensor 37 Y direction moving actuator 38 X direction moving table 39 X direction moving actuator 40 Magnetic head

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 21, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Oath

[Correction content]

[0005] Although scheme is conceivable to center inner diameter of the upper drum by a mandrel or collet, accompanied by disadvantages in terms of life and maintenance. Moreover, this method has a drawback that it is weak against temperature drift. Furthermore, since the center of the outer diameter of the rotary drum must be found and installed, the concentricity accuracy is poor. In addition to this, there is a method of rotating the rotating drum once and measuring how many times there is misalignment when rotating, but it has a drawback that it takes time and is inefficient.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Delete

[Correction content]

As shown in FIGS. 1 and 4, the Y-direction moving actuator 37 and the X-direction moving actuator 39 move the Y-direction moving table 30 and the X-direction so that they generate proper detection outputs. The table 38 is moved. That is, the microscope unit 25 is moved with respect to the rotary drum 14.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Delete

[Correction content]

In this state, the magnetic head 40
Perform the fixed operation of. The amount of protrusion of the magnetic head 40 from the outer peripheral surface of the drum 14 at this time is regulated by the microscope 31 including the lens barrel 32.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Oath

[Correction content]

When the first magnetic head 40 is mounted at a predetermined position in the circumferential direction of the rotary drum 14, after this, as shown in FIG.
As shown in FIG. 5, the upper drum 14 is rotated by a predetermined angle, and the same operation as described above is performed again to move the microscope unit 25 according to the outer peripheral surface of the upper drum 14.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Delete

[Correction content]

As described above, in the mounting apparatus according to the present embodiment, an error in the accuracy of angle indexing on the outer circumference of the upper drum 14 due to the misalignment of the upper drum 14 and the eccentric rotation of the main shaft unit 20 is avoided. Therefore, in the optical axis direction of the lens barrel 32 of the microscope 31, that is, in the Y direction and the X direction of 90 ° with respect to the optical axis direction, the upper drum 1 is detected by the sensors 33 and 35.
The outer circumference of 4 is detected. Then, the microscope unit 25 is moved by the actuators 37 and 39 so that the outer circumference of the upper drum 14 and the positions of the sensors 33 and 35 are determined by the signals from the sensors 33 and 35.

[Procedure amendment]

[Submission date] September 19, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005] Although scheme is conceivable to center inner diameter of the upper drum by a mandrel or collet, accompanied by disadvantages in terms of life and maintenance. Moreover, this method has a drawback that it is weak against temperature drift. Furthermore, since the center of the outer diameter of the rotary drum must be found and installed, the concentricity accuracy is poor. In addition to this, there is a method of rotating the rotating drum once and measuring how many times there is misalignment when rotating, but it has a drawback that it takes time and is inefficient.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

As shown in FIGS. 1 and 4, the Y-direction moving actuator 37 and the X-direction moving actuator 39 move the Y-direction moving table 30 and the X-direction so that they generate proper detection outputs. The table 38 is moved. That is, the microscope unit 25 is moved with respect to the rotary drum 14.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

In this state, the magnetic head 40
Perform the fixed operation of. The amount of protrusion of the magnetic head 40 from the outer peripheral surface of the drum 14 at this time is regulated by the microscope 31 including the lens barrel 32.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

When the first magnetic head 40 is mounted at a predetermined position in the circumferential direction of the rotary drum 14, after this, as shown in FIG.
As shown in FIG. 5, the upper drum 14 is rotated by a predetermined angle, and the same operation as described above is performed again to move the microscope unit 25 according to the outer peripheral surface of the upper drum 14.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

As described above, in the mounting apparatus according to the present embodiment, an error in the accuracy of angle indexing on the outer circumference of the upper drum 14 due to the misalignment of the upper drum 14 and the eccentric rotation of the main shaft unit 20 is avoided. Therefore, in the optical axis direction of the lens barrel 32 of the microscope 31, that is, in the Y direction and the X direction of 90 ° with respect to the optical axis direction, the upper drum 1 is detected by the sensors 33 and 35.
The outer circumference of 4 is detected. Then, the microscope unit 25 is moved by the actuators 37 and 39 so that the outer circumference of the upper drum 14 and the positions of the sensors 33 and 35 are determined by the signals from the sensors 33 and 35.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Hiyama 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Shoichi Miyauchi 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (1)

[Claims] 1. An X-direction and Y-direction displacement sensor for detecting the positions of the outer periphery of a rotating body that are offset from each other by approximately 90 °, the pair of displacement sensors being integrated as a unit relative to the rotating body. A head mounting device, characterized in that the head mounting position is adjusted by moving the head.