JP3161062B2 - How to adjust the position of the magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used in video tape recorders, digital audio tape recorders, etc.
The present invention relates to a magnetic head position adjusting method for adjusting a relative position (height) of a plurality of magnetic heads in a rotary head device that records and reproduces information signals on a magnetic tape.

[0002]

2. Description of the Related Art Generally, a rotary head device used in a video tape recorder, a digital audio tape recorder, or the like rotates with a plurality of magnetic heads fixed, so that each magnetic head correctly passes through a tape track of a magnetic tape. In order to reproduce a good image that does not bend or shake or a sound with good sound quality, it is necessary to adjust the relative position (height) of the plurality of magnetic heads to, for example, 1 μm or less. This adjustment is generally called a pairing adjustment.

A rotary head device usually has an upper drum fixed to a center rotary shaft and a lower drum rotatable with respect to the rotary shaft. Three magnetic heads are mounted on the upper drum by mounting screws. It is configured by attached. The position of each magnetic head is adjusted by turning an adjusting screw screwed into the upper drum and pushing the magnetic head toward the lower drum with the mounting screw as a fulcrum. In the pairing adjustment, the remaining magnetic heads are adjusted in the same manner as described above based on the height of the magnetic gap of the magnetic head whose position has been adjusted, and the relative height of each magnetic gap in each magnetic head is adjusted. The height is adjusted within 1 μm.

Conventionally, this pairing adjustment is performed by turning the adjustment screw with a driver while checking the image of the magnetic gap, which has been enlarged 1000 times or more with an ITV camera, on a monitor.

[0005]

However, the rotary head device has low rigidity due to its structure in which the upper drum is mounted on the bearing, so that the outer peripheral portion of the upper drum has a few gf from the top. Even if you add force,
There is a problem that the height of the magnetic head changes by several μm, and when a force is applied, the height is unstable with respect to the rotation direction of the upper drum. Therefore, in order for a human to perform a pairing adjustment with a driver, only the dexterity at hand and the intuition obtained by skill are relied on, and this is the most proficient operation in the drum assembly process.

For this reason, there is an individual variation in the pairing adjustment, and as a result, the variation between the rotary head devices (lots) increases, and there is a limit in improving the yield of the rotary head devices. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it possible to automate pairing adjustment which requires skill, thereby improving the yield of a rotary head device. It is an object of the present invention to provide a method for adjusting the position of a magnetic head.

[0008]

According to the present invention, an upper drum 3 fixed to a rotary shaft 2 and having a plurality of magnetic heads H1, H2 and H3 mounted thereon, and rotatably mounted on the rotary shaft 2. The magnetic heads H1, H2 of the upper drum 3 of the rotary head device 1 having the lower drum 4 and the rotary plate 6 fixed to the rotary shaft 2 below the lower drum 4.
The screwing amount of the adjusting screw 12 attached to the H2 and H3 so as to be able to move forward and backward is adjusted, and the magnetic head H at that time is adjusted.
The position of each of the magnetic heads H1, H2, and H3 is confirmed by imaging and confirming the positions of H1, H2, and H3 with an imaging device.
In the method of adjusting the position of the magnetic head for adjusting the relative position of the rotary head 3, after the rotary head device 1 is mounted on the receiving table 25, only the lower drum 3 of the rotary head device 1 is fixed to the receiving table 25, The imaging device 121 is rotated by rotating the plate 6.
And the first magnetic head H1 are opposed to each other.

Then, at least the pulse motor 92 and D
A gauge tip of the screwdriver jig 99 in the screwdriver means 28 constituted by selectively connecting a C motor 95 with an electromagnetic clutch 97 and fixing a screwdriver jig 99 to a rotating shaft 94 of the DC motor 95. Adjusting screw 100
2 into the hole 101 in the head, and then the DC motor 95
The tip of the adjusting screw 12 abuts against the head surface of the first magnetic head H1 by driving only the screwdriver and rotating the screwdriver jig 99 with low torque.

Thereafter, the DC motor 95 is connected to the electromagnetic clutch 9.
7, the pulse motor 92 repeats the forward and reverse rotations of the screwdriver jig 99, and pushes the first magnetic head H1 to adjust the position of the first magnetic head H1. I do. After that, the imaging device 1
The positions of the remaining magnetic heads H2 and H3 are adjusted based on the measurement value regarding the height of the first magnetic head H1 captured at 21.

As a method of rotating the rotary plate 6, there are:
A notch hole 15 is provided in a concentric portion of the rotating shaft 2 of the rotating plate 6, and an insertion pin 75 provided at an eccentric position of the rotation driving means 68 installed below the receiving table 25 is inserted. Is rotated by the rotation driving means 68 to rotate the rotating plate 6. In this case, the tip of the insertion pin 75 is formed to be sharp.

The lower drum 4 is fixed to the pedestal 25 by abutting the lower drum 4 against a plurality of reference pins 46.

[0013]

According to the magnetic head position adjusting method of the present invention, first,
The rotary head device 1 is placed on a receiving table 25. After that, the rotary head device 1 is abutted against a plurality of reference pins 46 to fix only the lower drum 4 to the receiving table 25. Next, insert pin 7
5 is inserted into the notch 15 of the rotating plate 6 and the rotation driving means 68 is driven to rotate the rotating plate 6 so that the imaging surface of the imaging device 121 and the first magnetic head H1 face each other.

Thereafter, the gauge tip 100 of the screwdriver jig 99 in the screwdriver means 28 is inserted into the hole 101 in the head of the adjusting screw 12, and only the DC motor 95 is driven to lower the screwdriver jig 99 to a low torque. By rotating at
The tip of the adjusting screw 12 is brought into contact with the head surface of the first magnetic head H1. At this time, the DC motor 95 stops due to an increase in torque due to the end of the adjusting screw 12 abutting on the magnetic head surface.

Thereafter, the stopped DC motor 95 and pulse motor 92 are connected via an electromagnetic clutch 97.
After that, the screwdriver jig 99 is rotated by the pulse motor 92. At this time, the screwdriver jig 99 is rotated forward and backward, and this forward and reverse rotation is repeated, thereby pushing the first magnetic head H1 toward the lower drum 4 and adjusting the position of the first magnetic head H1. .

This is because when the screwdriver jig 99 rotates forward, the position of the magnetic head H1 changes by the amount that the adjustment screw 12 is turned, but at the same time, the upper drum 3 causes the screwdriver jig 99 to rotate forward. As a result, the magnetic head H1 is displaced downward by a downward pressing force (stress), and the position of the magnetic head H1 becomes an apparent position. When the screwdriver jig 99 is reversed from this state, the upper drum 3
The downward pressing force (stress) applied to the upper drum 3 is released, and the upper drum 3 returns to the original position by the elasticity of the bearing 5 of the rotary head device 1.

From this, two consecutive rotations of the normal rotation and the reverse rotation are performed.
By the two processes, the magnetic head H1 is adjusted
The position is adjusted to a regular position corresponding to only the screwing amount of No. 2. This adjustment is performed by the first magnetic head H1 and the imaging device 1
21 are opposed to each other, the imaging device 1
This can be performed while checking the image of the magnetic head H1 captured at 21. The screwdriver 99 is separated from the adjusting screw 12 based on the completion of the position adjustment for the first magnetic head H1.

After that, the rotating plate 6 is rotated again so that the second magnetic head H2 and the imaging surface of the imaging device 121 face each other. Then, the position of the second magnetic head H2 is adjusted in the same manner as described above. In this case, the second magnetic head H1 is determined based on the measured value of the height of the first magnetic head H1 captured by the imaging device 121 in the previous position adjustment.
Adjust the position of 2. By performing this series of operations for all the magnetic heads, the pairing adjustment of the magnetic heads H1, H2, and H3 attached to the rotary head device 1 is completed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic head position adjusting method (pairing adjusting method) according to the present invention will be described below with reference to FIGS.

A rotary head device 1 to be subjected to a pairing adjustment method according to this embodiment is fixed to a rotary shaft 1 and has a plurality of magnetic heads H1, H2, as shown in FIGS.
And the upper drum 3 on which the rotary shaft 2 is mounted.
A lower drum 5 rotatably attached to the rotary shaft 2 through a bearing 4 and a rotary plate 6 fixed to the rotary shaft 2 below the lower drum 5.

The magnetic heads H1, H2 and H3 are fixed to the upper drum 3 by mounting screws 7, 8 and 9, respectively. Among these three magnetic heads H1, H2, and H3, for example, two magnetic heads H1 and H3 for recording / reproducing are mounted at positions 180 ° apart from each other,
One erasing magnetic head H2 is mounted at a position 90 ° apart from the two magnetic heads H1 and H2.

The position adjustment of each of the magnetic heads H1, H2 and H3 will be mainly described with reference to the magnetic head H1, as shown in FIG. 4, by adjusting the adjustment screw 12 screwed into the screw hole 11 provided in the upper drum 3. By turning, the magnetic head H1 is pushed toward the lower drum 4 with the mounting screw 7 as a fulcrum for adjustment. In the pairing adjustment, the remaining magnetic heads H2 and H3 are adjusted in the same manner as described above based on the height of the magnetic gap of the magnetic head H1 whose position has been adjusted, and the respective magnetic heads H1 and H2 are adjusted. And the relative height of each magnetic gap in H3 is adjusted within 1 μm.

The rotating plate 6 has a ring-shaped light receiving member 1 inside.
3 and a shutter member 14 is attached to a part of a peripheral portion thereof. The light receiving member 13 receives the light L emitted from the light projector 86 (see FIGS. 6 and 9) provided outside, and includes the light receiving member 13 and the external light projector 8.
6, a photoelectric switch is formed. When the shutter member 14 enters the detection area between the light receiving member 13 and the light projector 86 with the rotation of the rotating plate 6, the photoelectric switch is turned on, for example. In addition, the rotating plate 6 includes
A notch hole 15 into which a later-described kelly pin 75 (see FIGS. 6 and 10) is inserted is provided. In this embodiment,
When the photoelectric switch is turned on, the installation positions of the shutter member 14 and the light projector 86 are selected so that the cutout hole 15 of the rotating plate 6 and the Kellen pin 75 face each other.

The pairing adjustment for the rotary head device 1 is performed using a pairing adjustment device A shown in FIG. The pairing adjustment device A is installed on an assembly line of the rotary head device 1, and includes a loading-side positioning unit 21, a loading-side positioning unit 22, a loading mechanism unit 23, a loading mechanism unit 24, a receiving table 25, a first and a second. Rotation drive unit 26
27, an adjusting unit 28, a camera unit 29, a man-machine control console 30, and a control unit 31.

The loading-side positioning unit 21 and the unloading-side positioning unit 22 both push up the rotary head device mounting table 33 of the transport mechanism 32 of the rotary head device 1 disposed along the assembly line, and The mounting table 33 on which the unadjusted rotary head device 1 assembled in the previous process is mounted is positioned by the loading-side positioning section 21. At this time, the rotary head device 1 is not mounted on the mounting table 33 positioned by the unloading side positioning section 22.

When the pairing adjustment is completed by the adjusting device A, the adjusted rotary head device 1 is mounted on the mounting table 33 positioned by the unloading side positioning portion 22, and the mounting of the rotary head device 1 is completed. When completed, the transport mechanism 32 moves all the mounting tables, and the mounting table 33 (in an empty state) which has been in the loading-side positioning section 21 moves to the unloading-side positioning section 22 and moves to the unloading-side positioning section 22. The mounting table 33 (the adjusted rotary head device 1) which has been positioned by the
Are transported to the next assembling step.

The carry-in mechanism 23 comprises a chuck mechanism (not shown) for chucking the unadjusted rotary head device 1 and a slide mechanism (not shown) for moving the chuck mechanism up, down, left and right. This is for transporting the unadjusted rotary head device 1 mounted on the mounting table 33 positioned by the unit 21 to the receiving table 25 in the apparatus A. The unloading mechanism 24 includes a chuck mechanism 34 for chucking the adjusted rotary head device 1 and a slide mechanism 35 for moving the chuck mechanism 34 up, down, left and right. From the cradle 25 to the unloading side positioning part 22
Is transported to the mounting table 33 positioned by the above.

As shown in FIG. 6, the pedestal 25 is mounted on a cylindrical portion 43 fixed by screws or the like around the opening 42 provided on the apparatus base 41 so as to surround the opening 42.
It is attached via a washer member 44. The cradle 25 is provided with a hole 45 in the center.
Of the rotary head device 1
Is to be placed. When the rotary head device 1 is placed on the receiving table 25, the rotating plate 6 (see FIG. 8) of the rotary head device 1 faces downward through the hole 45 of the receiving table 25 and the opening 42 of the device base 41. Has become.
The pedestal 25 is provided with two reference pins 46 that rise upward.

Further, three clamp mechanisms 47, 48 and 49 are fixed to the apparatus base 41 by screwing. Each of the clamp mechanisms 47, 48 and 49 is
Arm 51 rotatably mounted between a pair of mounting members 50 fixed by screws to the cylinder 5, and a cylinder 5 for vertically rotating the clamp arm 51
And 2. The cylinder 52 is fixed to the base 41 via a mounting member 53 fixed to the apparatus base 41 by screwing. These clamping mechanisms 4
7, 48 and 49 respectively hold the lower drum 4 of the rotary head device 1 mounted on the
1 is pressed down.

That is, as shown in FIG. 9, from the state where the rotary head device 1 is mounted on the receiving table 25, first, the third clamp mechanism 49 farthest from the two reference pins 46 is rotated. It moves to the head device 1 side. By the movement of the clamp mechanism 49, the tip of the clamp arm 61 comes into contact with the lower drum 4 of the rotary head device 1, and further presses the rotary head device 1 toward the reference pin 46. The pressing of the clamp arm 61 causes the rotary head device 1 to abut against the reference pin 46, and the rotary head device 1 is positioned on the receiving table 25 as shown in FIG.

From this state, as shown in FIG. 9, the first and second clamp mechanisms 47 and 48 provided on the two reference pins 46 move to the rotary head device 1 side.
The tip of each clamp arm 61 contacts the lower drum 4 of the rotary head device 1. At this time, all the tips of the clamp arms 61 in the first to third clamp mechanisms 47 to 49 come into contact with the lower drum 4. The respective cylinders 52 of the clamp mechanisms 47, 48 and 49
As a result, the leading end of the clamp arm 61 is pressed downward by the lifting drive of the rear end of each clamp arm 61, whereby the lower drum 4 is pressed and fixed to the cradle 25 side (see FIG. 7). .

The first rotation drive section 26 is for rotatingly driving the upper drum 3 of the rotary head device 1 fixed on the receiving table 25. More specifically, as shown in FIG.
4 is fixed to the device base 41 by screwing, a first cylinder 55, an L-shaped arm 56 attached to the rear of the first cylinder 55 via a screw and a washer member, and the like. A pulse motor 57 attached to the vicinity of the bent portion of the arm 56 by screwing, a rotating shaft 59 attached to the tip of the L-shaped arm 56 via a washer member and the like, and a rubber roller 58 attached to the tip. It is composed of

The rear end of the rotating shaft 59 and the pulse motor 57
Pulleys 60 and 61 are fixed to the end of the motor shaft, respectively, and a belt 62 is stretched between the pulleys 60 and 61. Accordingly, the rotational force of the pulse motor 57 is transmitted to the rotating shaft 59 via the belt 62, and rotates the rubber roller 58 fixed to the tip of the rotating shaft 59. Also,
The L-shaped arm 5 is driven by the driving of the first cylinder 55.
The rotary shaft 59 moves in the vertical direction together with 6.

On the other hand, an L-shaped tongue piece 64 urged clockwise in the horizontal direction in the drawing is fixed to the side wall of the first cylinder 55 by a tension spring 63 by screwing. A U-shaped member 66 to which a second cylinder 65 is fixed at the rear is rotatably attached to the tip of the tongue piece 64.

Therefore, the L-shaped tongue piece 64 is normally urged clockwise in the horizontal direction in the drawing by the tension spring 63, and the rubber roller 58 is located at a position distant from the pedestal 25. Rotating head device 1 on cradle 25
Is fixed, by driving the second cylinder 65,
The L-shaped tongue 64 rotates counterclockwise in the horizontal direction, and its side end surface contacts the stopper 67, and the rubber roller 58 is positioned on the rotary head device 1. And the first cylinder 5
5 drives the L-shaped arm 56 to move downward, and the rubber roller 58 contacts the upper surface of the upper drum 3 of the rotary head device 1. From this state, the rubber roller 58 is rotated by the driving of the pulse motor 57, and the upper drum 3 of the rotating drum is rotated. The rotating plate 6 also rotates simultaneously with the rotation of the upper drum 3.

The second rotary drive section 27 is for rotatingly driving the rotary plate 6 of the rotary head device 1 fixed on the pedestal 25. More specifically, as shown in FIG. And a Kellen pin support mechanism 70 is mounted on a rotation shaft 69 of the pulse motor 68. The Kellen pin support mechanism 70 includes a mounting base 71 fixed to the rotation shaft 69 of the pulse motor 68 by screwing,
A Kellen pin support member 73 fixed to the upper portion of the mounting base 71 by screwing and having an insertion hole 72 at an eccentric position of the rotary shaft 69;
2 and a Kellen pin 75 urged upward by a compression spring 74. The support member 73
As shown in FIG. 10A, a bearing 76 is inserted between the mounting base 71 and the mounting base 71 so as to be movable in the lateral direction with respect to the mounting base 71.

The Kellen pin 75 has a sharp tip, and has an annular concave portion 77 at its axial center. A regulating plate 79 having a U-shaped notch 78 formed on the side of the insertion hole 72 is attached to the upper surface of the support member 73 by screwing. At this time, the U-shaped notch 78 is formed. The end face is the annular recess 7
7 Therefore, the upward movement of the Kellen pin 75 is restricted by the contact between the U-shaped end surface of the regulating plate 79 and the lower end surface of the annular concave portion 77 of the Kellen pin 75. In addition, the outer diameter of the kelly pin 75 is regulated at the upper end portion of the annular concave portion 77 by a regulating plate 79.
Annular projection 8 larger than the diameter of the U-shaped notch 78
0 is provided.

The device base 41 is provided with a lever mechanism 81 for pressing the Kellen pin 75 downward. The lever mechanism 81 includes a pin lever 83 rotatably mounted on a mounting member 82 fixed to the cylindrical portion 43 by screwing, and a cylinder 84 for rotating the pin lever 83 in the vertical direction.
The cylinder 84 is fixed to the base 41 via a mounting member 85 fixed to the apparatus base 41 by screwing. During the period other than the period for performing the pairing adjustment, the lever mechanism 81 holds the key pin 7 with the tip of the pin lever 83.
5 is pressed downward.

As a result, as shown in FIG. 10B, the annular projection 80 of the Kellen pin 75 is sandwiched between the pin lever 83 and the end face of the U-shaped notch 78 of the regulating plate 79. It will be fixed to the 73 side. On the other hand, during the pairing adjustment,
Is rotated upward by the driving of the cylinder 84, and the downward pressing on the annular projection 80 is released, so that the Kellen pin 75 moves upward by the urging of the compression spring 74. This moving range is substantially the same as the width of the annular recess 77.

The projector base 41 is provided with a light projector 86 constituting a photoelectric switch together with the ring-shaped light receiving member 13 (see FIG. 3) provided on the rotating plate 6.

Next, with regard to the operation of the second rotation drive unit 27, the rotary head device 1 is mounted on the receiving table 25,
The state in which the lower drum 4 of the rotating drum 1 is fixed to the pedestal 25 by the three clamp mechanisms 47, 48 and 49 will be described.

When the lower drum 4 is fixed to the receiving table 25,
The rotation of the rubber roller 58 by the first rotation drive unit 26 causes the upper drum 3 and the rotating plate 6 to rotate at low speed. Then, as shown in FIG. 9, when the shutter switch 14 provided on the rotary plate 6 blocks the light emitted from the light projector 86 to turn on the photoelectric switch, the rotation of the rubber roller 58 is stopped based on the ON signal. Then, the rotation of the upper drum 3 and the rotating plate 6 stops. At this time, the notch hole 15 provided in the rotating plate 6 and the tip of the Kellen pin 75 face each other.

Thereafter, when the cylinder 84 of the lever mechanism 81 is driven to lift the pin lever 83 upward, the Kellen pin 75 is lifted upward by a distance corresponding to the width of the annular recess 77, and the tip thereof is cut out of the rotary plate 6. Hole 1
5 is inserted. At this time, for example, even if the diameter of the notch hole 15 of the rotating plate 6 varies,
5 has a sharp end, so that it stops during its insertion, and the rotating plate 6 (and the upper drum 3) is held without rattling in the rotating direction. Further, even if the position of the notch hole 15 varies, for example, in the normal direction (radial direction of the rotating plate 6), the support member 73 supporting the Kellen pin 75 is laterally moved with respect to the mounting base 71 by the bearing 76. Since it is possible to move in the direction, the variation can be absorbed, and the Kellen pin 75 is reliably inserted into the notch hole 15.

The notch 15 of the rotating plate 6 is formed by the
Then, the rotary plate 6 and the upper drum 3 of the rotary head device 1 can be rotated by rotating the Kellen pin 75 by the pulse motor 68 in the second rotary drive unit 27. It becomes possible.

Next, the adjusting unit 28 will be described with reference to FIGS.
This will be described with reference to FIG. The adjusting unit 28 includes the magnetic heads H attached to the upper drum 3 of the rotary head device 1.
The heights of H1, H2 and H3 are adjusted by screwing. Specifically, as shown in FIGS. 11 and 12, a pulse motor 92 is provided in a cylindrical housing 91, and motor shafts 93 and 94 are provided at upper and lower portions. Protrude and these motor shafts 9
A two-axis type DC motor 95 for rotatingly driving the DC motors 3 and 94 with low torque; an electromagnetic clutch 97 for selectively connecting an upper motor shaft 93 of the DC motor 95 and a motor shaft 96 of the pulse motor 92; It is configured to house a screwdriver jig 99 attached to a distal end of a lower motor shaft 94 of the motor 95 via an attachment mechanism 98 described later.

In this screwdriver jig 99, the gauge tip 100 has the adjusting screw 1 of the magnetic heads H1, H2 and H3.
2 (see FIG. 4) is formed in a hexagonal shape that matches the shape (for example, hexagonal shape) of the hole 101 formed in the head.
As shown in FIG. 12, a mounting mechanism 98 for connecting the screwdriver jig 99 and the lower motor shaft 94 of the DC motor 95 includes a hollow portion 102 having an upper surface opening through which the lower motor shaft 94 of the DC motor 95 is inserted. A cylindrical member 106 in which a compression spring 103 is accommodated in the hollow portion 102 and a bolt member 105 having a hexagonal head 104 at a lower portion is integrally formed;
An upper portion has a first nut portion 107 screwed to a screw portion of the bolt member 105 of the cylindrical member 106, and a lower portion screwed to a screw groove provided at an upper portion of the screwdriver jig 99 at a lower portion. And a universal joint 109 having two nut members 108.

The lower motor shaft 94 of the DC motor 95
Is formed with a through hole in the lateral direction, and a pair of long holes 110 is formed in a portion of the cylindrical member 106 corresponding to the through hole. Then, the bolt member 111 is inserted so as to penetrate the pair of elongated holes 110 and the through holes in the lateral direction,
A nut is screwed into the tip of the bolt member 111. In this case, the cylindrical member 106 and the lower motor shaft 94 of the DC motor 95 are not tightened by the bolt member 111 and are free from each other.

In the vicinity of the DC motor 95 in the lateral direction,
Push-up mechanism 112 that pushes screwdriver jig 99 upward
Is provided. The push-up mechanism 112 includes a cylinder 113, an arm 115 rotatably attached to a tip of a cylinder shaft 114 extending downward from the cylinder 113, and pushing up the hexagonal head 104 of the cylindrical member 106 from below. A support member 116 fixed to the base 91 and rotatably supporting the vicinity of the middle of the arm 115
The arm 115 rotates in the vertical direction by driving the cylinder 113. A proximity switch 117 is attached to the opposite side of the push-up mechanism 112. The proximity switch 117 outputs an ON signal when the hexagonal head 104 of the cylindrical member 106 is detected, for example.

In the initial state, the arm 11
5 is held in a substantially horizontal direction, so that the arms 1
At the upper end of the distal end of 15, the cylindrical member 106, that is, the screwdriver jig 99 is pushed upward against the bias of the compression spring 103. At this time, the bolt member 111 is in contact with the upper end of the elongated hole 110, and the proximity switch 117 outputs an ON signal in accordance with the detection of the hexagonal head 104. At the time of pairing adjustment, the arm 115 is rotated downward by the driving of the cylinder 113 of the push-up mechanism 112, and the upward push of the screwdriver jig 99 is released. With this release, the screwdriver jig 99 is pressed downward by the load in the thrust direction by the compression spring 103, and the bolt member 111
10 contacts the lower end. At this time, since the hexagonal head 104 is located below the position of the proximity switch 117, an OFF signal is output from the proximity switch 117.

Then, with the rotation of the screwdriver jig 99, for example, in the forward direction (clockwise), the adjusting screw 12 (see FIG. 4)
Is screwed in the direction of the magnetic head (for example, H1) while receiving a relatively weak thrust load by the compression spring 103. When the screwing operation on the adjustment screw 12 is completed, the arm 115 is rotated upward by the driving of the cylinder 113 in the push-up mechanism 112 to lift the screwdriver jig 99 upward. Due to this lifting, the gauge tip 100 of the screwdriver jig 99 does not give vibration or the like to the
Momentarily away from the hole 101 in the head.

Further, the screwdriver jig 99 is supported in a floating state below the housing 91 via a floating mechanism 118 mainly composed of a ball bearing. Therefore, the screwdriver jig 99 is always held in a vertically suspended state by the universal joint 109 and the floating mechanism 118. Therefore, even if the position of the adjustment screw 12 varies depending on the processing accuracy of the upper drum 3, the universal joint 109 and the floating mechanism 1
By the use of 18, the displacement can be absorbed, and the gauge tip 100 of the screwdriver jig 99 can be inserted vertically into the hole 101 in the head of the adjustment screw 12.

Next, as shown in FIG. 5, a camera unit 29 is provided with a video camera 121 having a CCD solid-state imaging device.
And a positioning mechanism 122 for positioning and fixing the magnetic head mounting portion of the rotary head device 1 fixed on the receiving table 25 and the center of the imaging surface of the video camera 121.

On the other hand, the monitor M mounted on the man-machine control console 30 is provided with the video camera 12 of the camera section 29.
14 is processed to obtain a model image indicating the vertical dimension line 131 and the relative positions of the magnetic heads H1, H2, and H3, and the actual magnetic heads H1, H1 as shown in FIG. Magnetic gaps G1, G at H2 and H3
2 and G3 are displayed in a multi-image display mode. In this case, each of the magnetic gaps G1, G2 and G3 is
The image is displayed after being magnified 1000 times or more.

Next, a pairing adjustment method by the pairing adjustment apparatus A will be described with reference to the block diagram of FIG.
This will be described with reference to the flowchart of FIG. Here, of the flowcharts shown in FIGS.
6 to 18 show a main routine, and FIG. 19 shows a pairing adjustment processing routine (subroutine).

First, the transport mechanism 32 is operated by a drive signal from the central transport mechanism drive circuit 141 for operating the transport mechanism 32 of the assembly line, and the unassembled assembled in the previous process (pairing adjustment is not performed). Is transported to the pairing adjustment device A (step 1).

The loading-side rotating head device mounting table 33 on which the unadjusted rotating head device 1 is placed is mounted on the loading-side positioning unit 2.
When the position reaches 1, the known position detection sensor 142 detects the mounting table 33 and outputs a detection signal to the control unit 31. The control unit 31 outputs a stop request signal to the transport mechanism drive circuit 141 based on the input of the detection signal, and stops the transport of the rotary head device 1 by the transport mechanism 32 (Step 2).

After that, the control section 31 outputs a start signal to the positioning drive control circuit 143 so that the drive control circuit 14
Start 3 The positioning drive control circuit 143 operates the loading-side positioning unit 21 and the unloading-side positioning unit 22 based on the algorithm data from the operation memory 144 sent via the control unit 31, and the unadjusted rotary head device 1 The loading-side mounting table 33 on which the mounted loading-side mounting table 33 and the adjusted rotary head device 1 are mounted is pushed up and positioned (step 3).

Thereafter, the control section 31 outputs a start signal to the carry-in / out drive control circuit 145, and the drive control circuit 145
Start The carry-in drive control circuit 145 operates the carry-in mechanism unit 23 based on the algorithm data from the operation memory 144 sent via the control unit 31 to move the unadjusted rotary head device 1 to a chuck mechanism (not shown). And transferred from the mounting table 33 to the receiving table 25,
The rotary head device 1 is placed on the surface 5 (step 4).

Thereafter, the control section 31 outputs a start signal to the rotation drive control circuit 146. This rotation drive control circuit 1
First, the third clamp mechanism 49 is operated based on the input of the start signal and the algorithm data from the operation memory 144 sent via the control unit 31 to thereby reference the rotary head device 1. The rotary head device 1 is positioned by hitting the pin 46. Thereafter, the first and second clamp mechanisms 47 and 48 are operated to bring the respective clamp arms 51 into contact with the rotary head device 1, and are further rotated by the respective clamp arms 51 in the above-described first to third clamp mechanisms 47 to 49. The head device 1, particularly the lower drum 4, is pressed against the receiving table 25 side. Thus, the rotary head device 1 is fixed to the receiving table 25 (Step 5).

Thereafter, the control section 31 outputs a start signal to the first rotation drive section control circuit 147, and the control circuit 1
Activate 47. The control circuit 147 performs the first operation based on the algorithm data from the operation memory 144 transmitted via the control unit 31 and the rotation drive control circuit 146.
Is operated. That is, first, the second cylinder 65 is driven to move the rubber roller 58 onto the upper drum 3 of the rotary head device 1. After that, the first cylinder 55 is driven to bring the lower surface of the rubber roller 58 into contact with the upper surface of the upper drum 3. Thereafter, the pulse motor 57 is driven to slowly rotate the upper drum 3 (and the rotating plate 6) in one direction (step 6).

With the rotation of the upper drum 3 (and the rotating plate 6), the shutter member 14 is rotated, and at the stage where the light L emitted from the projector 86 is blocked by the shutter member 14, the photoelectric switch 148 is turned on. The driving of the pulse motor 57 is stopped based on the output of the ON signal, and the rotation of the upper drum 3 and the rotating plate 6 is stopped (step 7). At this time,
Notch hole 15 provided in rotary plate 6 and Kellen pin 7
5 are opposed to each other.

Thereafter, the lever mechanism 81 is operated to lift the pin lever 83 upward to release the downward pressing on the Kellen pin 75. The upward movement of the pin lever 83 causes the Kellen pin 75 to move the compression spring 7.
Due to the urging of 4, it is projected upward and inserted into the notch hole 15 provided in the rotating plate 6 (step 8). In the present embodiment, the urging force of the compression spring 74 is weakened, and the rotation drum 1 is set so as not to move upward by inserting the Kellen pin 75 into the notch hole 15.

When the insertion of the kellen pin 75 into the notch hole 15 is completed, the rotation drive control circuit 146 outputs a start signal to the first rotation drive control circuit 147 again. Based on the input of the activation signal, the first rotation drive control circuit 147 first drives the first cylinder 55 to separate the rubber roller 58 upward from the upper drum 3 of the rotary head device 1. Then, the drive by the second cylinder 65 is released. By this release, the first cylinder 5
5 is rotated by the tension spring 63, and the rubber roller 58 is separated from the rotary head device 1 in the lateral direction. At this point, the control unit 31 reads out the message data from the message memory 149 and outputs it to the monitor M via the image processing circuit 150. The monitor M displays, for example, a message indicating that the preparation is completed, and requests the operator to rotate the pulse motor 68 in the second rotation drive unit 27 (step 9).

Then, the control section 31 outputs a rotation drive signal to the rotation drive control circuit 146 based on a key input indicating a rotation request from the keyboard 151 by the operator (step 10). The rotation drive control circuit 146 drives the pulse motor based on the input of the rotation drive signal from the control unit, rotates the Kellen pin 75, and rotates the rotary plate 6 of the rotary head device 1 (step 11). At this time, the operator checks the image sent from the video camera 121 of the camera unit 29 on the monitor M (step 1).
2), when the magnetic gap G1 of the first magnetic head H1 to be adjusted is reflected on the monitor M, a key input indicating a rotation stop request is performed (step 13). The control unit 31 outputs a stop signal to the rotation drive control circuit 146 based on the rotation stop request signal from the keyboard 151, and stops the rotation of the pulse motor 68 (step 14).

Thereafter, the control unit 31 controls the adjustment unit control circuit 1
An activation signal is output to 52. The adjustment unit control circuit 152 includes:
First, an activation signal is output to the slide mechanism control circuit 153 based on the input of the activation signal and the algorithm data from the operation memory 144 sent via the control unit 31. The slide mechanism control circuit 153 operates a known slide mechanism (not shown) based on the input of the start signal to slowly move the entire casing 91 of the adjustment unit 28 downward, and to adjust the gauge tip of the screwdriver jig 99. 100 is inserted into the hole 101 in the head of the adjusting screw 12 (step 15 shown in FIG. 17). With this insertion, the adjustment screw 12
When the bottom of the hole 101 in the head contacts the gauge tip 100 of the screwdriver jig 99 and the housing 91 further moves downward in this state, the screwdriver jig 99 is moved simultaneously with the movement of the housing 91 by the compression spring 103. Move upward against the urging of. Since the hexagonal head 104 moves upward with the upward movement of the screwdriver jig 99, the hexagonal head 104 is detected again by the proximity switch 117, and an ON signal is output from the proximity switch 117. You.

The adjustment unit control circuit 152 outputs a start signal to the DC motor drive control circuit 154 based on the ON signal from the proximity switch 117. The DC motor drive control circuit 154 rotates the DC motor 95 at low torque based on the input of the start signal, and screws the adjusting screw 12 downward (step 16). Usually, there is a gap of about 0 to 1 mm between the tip of the adjusting screw 12 and the head surface of the magnetic head H1 (and H2, H3).
Will be screwed into this gap by the DC motor 95.

When the tip of the adjusting screw 12 abuts on the head surface of the magnetic head H1, the rotation of the DC motor 95 is stopped by the torque increase accompanying the abutment (step 17). Due to this collision, the magnetic head H1 changes by about 2 to 3 μm. Preferably, the torque of the DC motor 95 is adjusted so as not to exceed the adjustment range.

Thereafter, the adjusting section control circuit 152 outputs a connection request signal to the electromagnetic clutch opening / closing circuit 155. The electromagnetic clutch opening / closing circuit 155 operates the electromagnetic clutch 97 based on the input of the connection request signal to connect the motor shaft 96 of the pulse motor 92 and the upper motor shaft 93 of the DC motor 95 (Step 18). At this time, the operator confirms the position of the magnetic head H1 on the monitor M and the target position where the magnetic head H1 is to be arranged, and inputs target position data via the keyboard 151 (step 19).

Based on this input, the adjusting unit control circuit 15
2 reads the image data of the magnetic head H1 from the image processing circuit 150 via the control unit 31 and supplies the image data to the arithmetic unit 156. The resolution of the image processing in the image processing circuit 150 is 0.18 μm in this embodiment.
The calculation unit 156 analyzes the position of the magnetic head H1 from the image data according to the calculation procedure in the calculation program memory 157 sent from the adjustment unit control circuit 152.
This position data is temporarily stored in the data memory 158 through the adjustment unit control circuit 152.

Thereafter, the adjustment unit control circuit 152 supplies the target position data input via the keyboard 151 to the calculation unit 156. The calculation unit 156 automatically calculates the interval between the magnetic head H1 and the target position based on the supplied target position data and the position data of the magnetic head H1 analyzed from the image data, and stores the interval data in the data memory. 158 is registered in a certain array variable area (step 20).

Thereafter, the adjustment section control circuit 152 outputs a start signal to the pulse motor drive control circuit 159. The drive control circuit 159 rotationally drives the pulse motor 92 based on the input of the start signal (step 21). By this rotational driving, the screwdriver jig 99 repeats normal rotation and reverse rotation, and the position of the magnetic head H1 is adjusted. The repetition of the normal rotation and the reverse rotation is performed by first adjusting the adjustment screw 12 during the normal rotation.
The magnetic head H1 is pushed downward by the amount turned by the screwdriver jig 99.

However, at the same time, the contact friction between the gauge tip 100 of the screwdriver jig 99 and the side wall of the hole 101 of the head of the adjustment screw 12 and the downward pressing force (stress) on the adjustment screw 12 by the screwdriver jig 99 )
The upper drum 3 of the rotary head device 1 is displaced downward. Therefore, the magnetic head H1 at the time of forward rotation of the screwdriver jig 99
Is the apparent position. For this reason, the screwdriver jig 99 is set within the clearance between the diameter of the gauge tip 100 and the diameter of the hole 101 in the head of the adjustment screw 12.
To reverse.

Thus, the stress applied to the upper drum 3 during the forward rotation is released, and the upper drum 3 returns to the original position by the elasticity of the bearing 5 of the rotary head device 1.
By the return of the upper drum 3, the magnetic head H1 is located at a regular height corresponding to the screwing amount of the adjusting screw 12. That is, the pushing amount by the pulse motor 92 is (forward rotation pulse amount) − (reverse rotation pulse amount), and the minimum pushing amount in this embodiment is set to about 0.1 μm.

Then, from the target position to, for example, a position 1 μm before the target position, the adjusting screw 12 is screwed in while the pushing amount is set to a relatively coarse pitch (for example, 0.5 μm). This operation can be performed while the interval data registered in the data memory 158 is used as an initial value, and the initial value is subtracted from the pitch data. When the interval data becomes 1 μm, a stop signal is output from the arithmetic unit 156 to the adjusting unit control circuit 152, and the adjusting unit control circuit 152 receives the stop signal and outputs the pulse motor drive control circuit 1
By outputting a stop signal to the motor 59, the pulse motor 9
2 is stopped (step 22).

Thereafter, the adjusting unit control circuit 152 outputs a start signal to the pulse motor drive control circuit 159 again, and
The pulse motor 92 is driven to rotate. By this rotation, the screwdriver jig 99 repeats the normal rotation and the reverse rotation again. In this case, the adjusting screw 12 is screwed with the pushing amount set to a relatively dense pitch (for example, 0.2 μm) (step 23). When the interval data in the data memory 158 becomes 0, that is, when the magnetic head H1 reaches the target position, a stop signal is output from the adjustment unit control circuit 152 to the pulse motor drive control circuit 159, and the pulse signal is output. The motor 92 stops automatically (step 2
4).

Thereafter, the adjusting section control circuit 152 reads out the image data of the magnetic head H1 sent from the image processing circuit 150 via the control section 31 and supplies this image data to the arithmetic section 156 to read the actual magnetic data. The position of the head H1 is analyzed (step 25). This position data is registered in a certain array variable area in the data memory 158 through the adjustment unit control circuit 152.

Thereafter, the adjusting section control circuit 152 outputs a start signal to the push-up mechanism driving circuit 160. The drive circuit 160 drives the cylinder 113 of the push-up mechanism based on the input of the start signal, thereby rotating the arm 115 upward and pushing up the screwdriver jig 99 (step 26). By this pushing-up operation, the gauge tip 100 of the screwdriver jig 99 is instantly separated from the hole 101 in the head of the adjusting screw 12. When the screwdriver jig 99 is completely pushed up and the proximity switch 117 detects the hexagonal head 104 to output an ON signal, the adjustment unit control circuit 152 supplies a start signal to the slide mechanism control circuit 153. Being
The housing 91 itself moves upward (step 27).

Then, in step 28 shown in FIG. 18, the pairing adjustment is performed. In this pairing adjustment, first, as shown in the subroutine of FIG.
By outputting a rotation drive signal from the control unit 31 to the rotation drive control circuit 146 and driving the pulse motor 68,
The rotating plate 6 is rotated by 90 ° (step 101). At this time, the magnetic gap G2 of the second magnetic head H2 is displayed on the monitor M.

Thereafter, similarly to step 15, the adjusting unit 2
Then, the entire housing 91 is slowly moved downward, and the gauge tip 100 of the screwdriver jig 99 is inserted into the hole 101 in the head of the adjusting screw 12 of the second magnetic head H2 (step 102). Thereafter, as in Steps 16 to 18, the DC motor 95 is driven to rotate based on the output of the ON signal from the proximity switch 117, and the adjusting screw 12 abuts against the head surface of the magnetic head H2 (Step 103). The DC motor 95 stops due to the increase in torque accompanying the abutment (step 104). Thereafter, based on the stop of the DC motor 95, the upper motor shaft 93 of the DC motor 95 and the motor shaft 96 of the pulse motor 92 are connected by the electromagnetic clutch 97 (step 10).
5).

Thereafter, the adjusting unit control circuit 152 reads out the image data of the second magnetic head H2 sent from the image processing circuit 150 via the control unit 31, and supplies this image data to the arithmetic unit 156. Actual magnetic head H2
Analyze the position of. After that, the data memory 158
The position data (which becomes target position data) in the first magnetic head H1 is read out, and the first magnetic head H1 (target position) and the second magnetic head H2 are read out by the arithmetic unit 156.
Is calculated (step 106).

Then, similarly to steps 21 to 24, the pulse motor 92 is rotationally driven (step 10).
7), the screwdriver jig 99 is rotated forward and backward, and the repetition is further repeated until the second magnetic head H2 is at a position 1 μm before the target position, and the adjustment screw 12 is roughly pushed in by, for example, 0.5 μm. Screw in at the pitch. And
When the magnetic head H2 reaches the above position, the rotational driving of the screwdriver jig 99 is temporarily stopped (step 108).
Thereafter, the pulse motor 92 is driven to rotate again, and the adjusting screw 1 is driven at a relatively dense pitch (push amount = 0.2 μm).
2 is screwed in (step 109), the magnetic head H2 reaches the target position, and the pulse motor is automatically stopped (step 110).

Thereafter, as in steps 26 and 27,
By operating the push-up mechanism 112, the screwdriver jig 99 is pushed upward, the gauge tip 100 of the screwdriver jig 99 is removed from the hole 101 in the head of the adjusting screw 12 (step 111), and the proximity switch 117 is further released. The housing 91 itself is moved upward based on the output of the ON signal (step 112).

Thereafter, in step 113, it is determined whether the pairing adjustment has been completed for all the magnetic heads H1, H2 and H3. If the processing has not been completed, the flow returns to step 101 again to perform the above-described series of processing (processing indicated by a subroutine). In the present embodiment, the pairing adjustment for the third magnetic head H3 is performed. The pairing adjustment for the third magnetic head is performed in Step 10 described above.
Steps 1 to 112 are the same as those described above, and a description thereof is omitted. When the pairing adjustment for the third magnetic head H3 is completed, each of the magnetic heads H1, H2 and H3
Is adjusted within 1 μm.

Then, all the magnetic heads H1, H2
When the pairing adjustment for H3 and H3 is completed, the process returns to the main routine shown in FIG. 18, and the fixation of the rotary head device 1 to the cradle 25 is released (step 29). This release is performed by supplying a start signal from the control unit 31 to the rotation drive control circuit 146. That is, when the start signal is supplied to the rotation drive control circuit 146, the first to first signals are output.
Each clamp arm 51 of the third clamp mechanisms 47 to 49
Is rotated upward to release the pressing of the rotary head device 1 below the receiving table 25, and thereafter, the first to third clamp mechanisms 47 to 49 are moved in a direction away from the receiving table 25. Done by

Thereafter, the control section 31 outputs a start signal to the carry-in / out drive control circuit 145, and the drive control circuit 145
Start The carry-in / out drive control circuit 145 includes the control unit 31
The unloading mechanism 24 is operated based on the algorithm data from the operation memory 144 sent via the CPU, the adjusted rotary head device 1 is held by the chuck mechanism 34, and the unloading side loading is performed from the receiving table 25. It is transported to the mounting table 33, and the rotary head device 1 is mounted on the mounting table 33 (step 30).

Thereafter, the control section 31 outputs a start request signal to the transport mechanism drive circuit 141 to restart the transport of the rotary head device 1 by the transport mechanism 32 (step 31).
The adjusted rotary head device 1 is transported to a subsequent process by the transport mechanism 32.

By repeating the above series of operations (operations shown in the main routine), the unadjusted rotary head device 1 conveyed from the previous process is adjusted for pairing, and the pairing adjustment is further performed. The adjusted rotary head device 1 is transported to a subsequent process.

As described above, according to the pairing adjustment method according to the present embodiment, after the rotary head device 1 is mounted on the receiving table 25, only the lower drum 4 of the rotary head device 1 is mounted on the receiving table 2.
5, the rotating plate 6 is rotated to make the imaging surface of the video camera 121 and the first magnetic head H1 face each other, and then the gauge tip 100 of the screwdriver jig 99 in the adjusting unit 28 is adjusted with an adjusting screw. 12 into the hole 101 in the head,
Then, only the DC motor 95 is driven to drive the screwdriver jig 9.
9 is rotated at a low torque, so that the adjusting screw 12 is rotated.
Abuts against the head surface of the first magnetic head H1. Thereafter, the DC motor 95 is connected to the pulse motor 92 via the electromagnetic clutch 97, and this pulse motor 92
By repeating the forward and reverse rotation of the screwdriver jig 99,
The first magnetic head H1 is pushed in to adjust the position of the first magnetic head H1.

The positions of the remaining magnetic heads H2 and H3 are adjusted based on the measured value of the height of the first magnetic head H1 captured by the video camera 121. The relative height of each of the magnetic heads H1, H2, and H3 can be adjusted within 1 μm, and this height adjustment can be easily automated, thereby improving the yield of the rotary head device 1. be able to.

The pairing adjustment method according to the above embodiment is as follows.
In addition to a rotary head device for a video tape recorder, the present invention can be applied to a recorder using the rotary head device, for example, a rotary head device for a digital audio tape recorder.

[0091]

As described above, according to the magnetic head position adjusting method of the present invention, after the rotary head device is mounted on the receiving table, only the lower drum of the rotary head device is mounted on the receiving table. After the rotating plate is rotated to make the imaging surface of the imaging device and the first magnetic head face each other, at least a pulse motor and a DC motor are selectively connected by an electromagnetic clutch, and Insert the tip of the gauge of the screwdriver jig in the screwdriver means having a screwdriver jig fixed to the rotating shaft of the DC motor into the hole in the head of the adjustment screw, and then drive only the DC motor. By rotating the screwdriver with a low torque, the tip of the adjusting screw abuts against the head surface of the first magnetic head, and then the DC motor is connected via the electromagnetic clutch. And the pulse motor is rotated by the pulse motor to repeat forward and reverse rotations of the screwdriver jig, push in the first magnetic head, adjust the position of the first magnetic head, and thereafter, Since the positions of the remaining magnetic heads are adjusted based on the measured value of the height of the first magnetic head taken by the imaging device, the relative height of the magnetic head attached to the rotary head device is adjusted. Can be adjusted within 1 μm, the height adjustment can be easily automated, and the yield of the rotary head device can be improved.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a configuration of a rotary head device to be subjected to pairing adjustment according to the present invention.

FIG. 2 is an external perspective view showing a back side of an upper drum in the rotary head device.

FIG. 3 is a side view showing the structure of the rotary head device, partially cut away;

FIG. 4 is an enlarged view showing a magnetic head mounting portion of the rotary head device.

FIG. 5 is a perspective view showing a pairing adjustment device used in pairing adjustment according to the present invention.

FIG. 6 is an exploded perspective view showing a pedestal, a first rotation drive unit, and a second rotation drive unit in the pairing adjustment device.

FIG. 7 is a side view showing an arrangement of a receiving base, a first rotation drive unit, and a second rotation drive unit in the pairing adjustment device.

FIG. 8 is a side view showing the arrangement of the pedestal, the first rotation drive unit, and the second rotation drive unit in the pairing adjustment device when viewed from another direction.

FIG. 9 is an explanatory diagram showing the operation of the first to third clamp mechanisms and the operation of the photoelectric switch.

FIG. 10A is a plan view showing a Keray pin holding mechanism, and FIG. 10B is a cross-sectional view showing the Keray pin holding mechanism together with a side surface of a lever mechanism.

FIG. 11 is a side view showing the configuration inside the housing of the adjustment unit.

FIG. 12 is a side view showing the configuration inside the housing of the adjustment unit when viewed from another direction.

FIG. 13 is an exploded perspective view showing a configuration inside a housing of an adjustment unit.

FIG. 14 is an explanatory diagram illustrating an example of an image displayed on a monitor.

FIG. 15 is a block diagram illustrating signal processing of the pairing adjustment device according to the present invention.

FIG. 16 is a flowchart (main routine: 1) illustrating an operation of the pairing adjustment device according to the present invention.

FIG. 17 is a flowchart (main routine: part 2) illustrating the operation of the pairing adjustment device according to the present invention.

FIG. 18 is a flowchart (main routine: 3) showing the operation of the pairing adjustment device according to the present invention.

FIG. 19 is a flowchart (subroutine) showing a pairing adjustment operation of the pairing adjustment device according to the present invention.

[Explanation of symbols]

 Reference Signs List A A pairing adjusting device 1 Rotating head device 2 Rotating shaft 3 Upper drum 4 Lower drum 5 Bearing 6 Rotating plate 7-9 Mounting screws H1-H3 Magnetic head 12 Adjusting screw 13 Light receiving member 14 Shutter member 15 Notch hole 21 Loading side positioning Unit 22 Unloading-side positioning unit 23 Loading mechanism unit 24 Unloading mechanism unit 25 Receiving stand 26 First rotation drive unit 27 Second rotation drive unit 28 Adjustment unit 29 Camera unit 30 Man-machine control console 31 Control unit 32 Transport mechanism 33 Mounting Table 41 Device base 46 Reference pin 47 to 49 First to third clamp mechanisms 51 Clamp arm 58 Rubber roller 68 Pulse motor 75 Kellen pin 81 Lever mechanism 83 Pin lever 91 Housing 92 Pulse motor 95 DC motor 97 Electromagnetic clutch 98 Mounting mechanism 99 Screw Turning jig 100 Gauge tip 1 1 adjustment screw head holes 112 push-up mechanism 117 the proximity switch 118 floating mechanism 121 video camera M monitor G1~G3 magnetic gap

Continuation of the front page (72) Inventor Mitsuhiko Takahashi 1 Kozaka-cho, Kota-cho, Nada-gun, Aichi Prefecture 1 Sakazaki-Jizugairi Entered by Sony Koda Co., Ltd. 36725 (JP, A) JP-A-61-50208 (JP, A) JP-A-1-170321 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5/53

Claims (4)

(57) [Claims] An upper drum fixed to a rotating shaft and having a plurality of magnetic heads mounted thereon, a lower drum rotatably mounted on the rotating shaft, and a lower drum attached to the rotating shaft below the lower drum. The amount of screwing of the adjusting screw, which is attached to the upper drum of the rotary head device having the rotating plate fixed thereto, so as to be able to advance and retreat with respect to each of the magnetic heads, is adjusted, and the position of the magnetic head at that time is imaged by the imaging device. Then, by confirming, in the magnetic head position adjusting method for adjusting the relative position of each magnetic head, after mounting the rotary head device on a pedestal, only the lower drum of the rotary head device After being fixed to a cradle, the rotating plate is rotated to make the imaging surface of the imaging device and the first magnetic head face each other. And a screw tip of the screwing jig in the screwing means, which is selectively connected to the rotary shaft of the DC motor with a screwdriver by an electromagnetic clutch, and the head of the adjusting screw is connected to the head of the adjusting screw. Then, only the DC motor is driven to rotate the screwdriver jig with a low torque so that the tip of the adjusting screw abuts against the surface of the first magnetic head. The DC motor is connected to the pulse motor via the electromagnetic clutch, and the pulse motor is used to repeatedly rotate the screwdriver jig forward and reverse to push in the first magnetic head, thereby causing the first magnetic head to be pushed in. The position of the magnetic head of the eye is adjusted, and then, based on the measured value of the height of the first magnetic head captured by the imaging device,
A method of adjusting the position of a magnetic head, comprising adjusting the positions of the remaining magnetic heads. 2. The rotating plate has a notch hole in a concentric portion of the rotating shaft, into which an insertion pin provided at an eccentric position of a rotation driving means installed below the receiving base is inserted. 2. The method for adjusting the position of a magnetic head according to claim 1, wherein: 3. The method for adjusting the position of a magnetic head according to claim 1, wherein the fixing of the lower drum to the receiving table is performed by abutting the lower drum against a plurality of reference pins. 4. The method for adjusting the position of a magnetic head according to claim 2, wherein a tip of said insertion pin is formed sharp.