JPH0585963B2 - - Google Patents

Description

[Detailed description of the invention]

(a) Field of Industrial Application The present invention relates to a polishing device for a magnetic head used in a magnetic recording/reproducing device such as a video tape recorder (VTR). (B) Prior Art In the manufacturing process of a VTR, a polishing step is required in which the rotary head is attached to a head disk and the head is polished using a polishing tape.
An example of this polishing apparatus is disclosed in Japanese Patent Application Laid-open No. 172110/1983. In the prior art, upper and lower guide cylinder sections facing each other with a predetermined gap, an abrasive tape mounted on the upper and lower guide cylinder sections, and a head disk equipped with a rotary head are mounted to move the polisher to a first position and a second position. A head disk holder is movable between the head disk holder and the head disk holder, and the head disk can be attached and removed at a first position of the head disk holder, and at the second position, the head disk is moved from the gap between the upper and lower guide cylinder parts. The present invention is characterized in that a rotary head is projected and the rotary head is polished by the polishing tape. (c) Problems to be Solved by the Invention In the prior art described above, when the rotary head is detached from the head disk after polishing is completed, a braking force is applied to the motor in advance so that the operator must manually do so. However, in order to automate this detachment work with a robot, it is necessary to position the head disk at the stop position in the rotational direction at the first position with extremely high precision, and simply apply braking force to the motor. It is difficult to respond by simply adding . (D) Means for Solving the Problems The present invention is a polishing device for a magnetic head, which includes a polishing device having a predetermined gap, a polishing tape mounted on the polishing device, and a magnetic head that can be attached and detached. a head disk for attaching the magnetic head, which is movable between a first position where the magnetic head is mounted and a second position where polishing is performed by the polishing tape that causes the magnetic head to protrude from the gap; A drive means for rotating at a low speed and at a high speed at the second position, a flange part interlocked with the drive means and having a groove for positioning, and a lock that engages with the groove when the head disk returns to the first position. It is characterized by having a member. (f) Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view schematically showing the entire apparatus of this embodiment, FIG. 3 is a perspective view of the main parts, and FIG. 4 is a plan view thereof. Reference numeral 1 denotes a head base mounting device, which has a rotating jig main body 2 and three displacement drive means 3, 4, and 5. The displacement drive means 3, 4, 5 are formed by air cylinders, and the shafts 3a,
3b and 3c each move in the direction of the arrow in FIG. 4 and act on the pressing means on the rotating jig main body 2 side. 6
8 is a first polishing device consisting of a tape guide cylinder having a gap for polishing by running a relatively coarse polishing tape 7 of #8000, and 8 is a #12000 tape.
This is a second polishing device that performs polishing by running a tape 9 for fine polishing.
After the main body 2 of the rotating jig moves along the guide groove 50 toward the first polishing device 6 and comes into contact with the first polishing device 6, the tape 7 is run in this state, and the main body 2 of the rotating jig is rotated to remove the tip of the magnetic head. Perform rough polishing. After that, the rotating jig main body 2 is moved to the second polishing device 8 on the opposite side.
There, the second polishing device performs fine polishing. Here, the tapes 7 and 9 are connected to a supply reel 64 placed on a supply reel stand arranged with a predetermined step on the support plate 44 and a take-up reel stand.
65 and between the take-up reels 62 and 63, and the polishing tapes 7 and 9 are connected to the supply reel 6.
Guide rollers 71, 7 let out from 4, 65
2. First and second polishing devices 6, 8, pinch roller 7
3, 74, capstans 75, 76, and guide rollers 77, 78 run in this order, and the take-up reels 62, 6
It is wound up in 3. Next, Fig. 5 shows the rotating jig main body 2 taken out.
FIG. 7 will be explained. The rotating jig main body 2 includes a rotating substrate 10 and a flat pedestal 1.
1 and a wall section 12, the wall section 12 is located at the top and has two L-shaped walls. This L
The planar cradle 11 is arranged below the wall portion 12 so as to define the bottom surface of the recess 13 facing the shaped wall. The rotating board 10 has a groove 14 facing a part of the lower surface of the flat pedestal 11.
A press plate 16 having a pressure contact piece 16' whose one end faces one surface 15a of the L-shaped wall and protrudes upward is disposed so as to be able to contact and slide on the lower surface of the flat holder 11. . This situation is clearly shown in the sectional view of FIG. That is, the rotating substrate 10
The wall portion 12 and the flat pedestal 1 are attached to the pin 17 planted in the
1 is fixed, and a spring 19 stretched between the pin 17 and a small pin 18 protruding downward from the press plate 16 urges the press plate 16 toward the pin 17 side. Abuts on one end. In addition, press plate 1
6 is fitted into the pin 17 via the elongated hole 20,
A displacement is possible within the range of this elongated hole 20. 7th
In the figure, the pressure plate 16 is just receiving an external force and the spring 1 is
In this state, when the head base 21 is placed on the flat pedestal 11 and the external force applied to the pressing plate 16 is released, the pressing plate 16 is Pressing piece 16' presses head base 21 toward one side of the L-shaped wall. FIG. 6 shows the head base 21 held in the recess 13 under pressure. Incidentally, a guide rail portion 22 is formed on the rotary substrate 10 in order to make the displacement of the pressing plate 16 smooth. As shown in FIG. 8, the head base 21 includes a front portion 24 to which a magnetic head 23 is attached;
It consists of a lead conductor 25 and a back portion 27 having an attachment hole 26, but the attachment hole 26, conductor 25, etc. are omitted in FIG. 6. Similar to the wall portion 12 described above, the flat receiving portion 11 is attached to all mounting points.

It is composed of a single piece so that it is common to [three places in the case shown], but the pressure plate 1
6 are provided individually. Pressing plate 16
The other end projects toward the adjacent mounting part, and this projecting portion 16'' is used as the shaft 3a, 3b, 3c of the displacement drive means 3, 4, 5 shown in FIG.
is pushed to displace the pressing plate 16 against the biasing force of the spring 19. FIG. 1 shows a drive mechanism for controlling the drive of the rotating jig main body 2. As shown in FIG. A rotating disk 40 and a flange portion 41 are fixed to the rotating shaft 2a of the rotating jig main body 2, and a pulley 42 is inserted and fitted at the tip. A belt 46 is wound around a motor pulley 45 of a motor (driving means) 43 fixed to the lower surface of a support plate 44 . 9 and 10 show the locking mechanism of the flange portion 41, and the flange portion 41 has a V-shaped groove 47.
is formed. An engagement plate (locking member) 49 passing through a guide hole 48a of the support block 48 faces the side of the flange portion 41. Flange portion 5 integrally fixed to the rear end of this engagement plate 49
A coil spring 53 is interposed between the engagement plate 49 and the protrusion 52 integral with the support plate 51, and the engagement plate 49 is biased toward the flange portion 41. Engagement plate 4
9 has an acute-angled notch and passes through a regulating plate 55 that is movable in the front and back direction by an air cylinder 54 fixed to the support plate 51, and the collar 50 is in contact with this regulating plate 55. The position of the engagement plate 49 is regulated by this. Next, FIG. 11 shows the head base 21 placed in the recess 1.
3. Head base attachment/detachment means 2 for supplying and detaching
In the state shown in FIG. 4, this means 28 descends from directly above the rotating jig main body 2 (perpendicular to the plane of the paper in FIG. 1) and can attract the head base 21 to the tips of its legs 29. It is. The attachment/detachment means 28 is a spring means 3 disposed in a large diameter recessed portion 31 of the cylinder body 30.
The control cam 34 is provided with a cam 33 that is biased toward the center by a cam 2, and a truncated conical control cam 34 that is fitted into the center of the cam 33. It is formed integrally with a guide body 36 that moves up and down while being guided by an extending hollow part 35. On the other hand, the cam 33 is provided with an air passage therein, and has a leg part 29 at its end that attracts the head base 21. The control cam 34 is normally in a downwardly moved position, so the three cams 33 are spaced apart from each other and their legs 29 are spread out, but the head base 21 is not connected to the rotating jig main body 2. When applying to the recess 13, the control cam 3 is
4 moves upward to the state shown in FIG. At this time, the legs 29 narrow together. This allows the rear end of the head base 21 to be aligned with the other surface 1 of the L-shaped wall.
5b. Next, the operation of the apparatus of this embodiment will be explained. In the initial state, the rotating jig main body 2 is placed in the intermediate position shown in Fig. 4.
is located here, and the head base 21 is attached to the rotating jig main body 2 by the attachment/detachment device 28. When this installation is completed, the rotating jig main body 2 is moved to the first polishing device 6 side by an air cylinder (not shown), and the three magnetic heads attached to the rotating jig main body 2 are moved from the gap between the tape guide cylinders. It protrudes by a predetermined amount and stops when it comes into contact with the polishing tape 7. Then the motor 43 starts driving,
The rotating shaft 2a rotates at a high speed of about 3000 RPM.
When the polishing tape 7 is rotated in this state by repeating forward and reverse rotation several times, the head is polished by the tape guide cylinder portion while the polishing tape 7 is wound from the supply reel 64 side to the take-up reel 62, and a rough finish is achieved.
Thereafter, when both the tape feeding and the rotation of the motor 43 are stopped, the rotating jig main body 2 moves toward the second polishing device 8, and the three magnetic heads protrude by a predetermined amount from the gap of the tape guide cylinder, and the polishing tape 9 and It stops at the point of contact. So motor 4 again
3 starts high speed rotation of 3000 RPM and precision finishing is done. Thereafter, when the tape feeding and the rotation of the motor 43 are stopped, head polishing is completed and the rotating jig main body 2 returns to its initial position. At this position, motor 2 starts rotating again,
This time it will rotate at a low speed of 100 RPM or less. This low-speed rotation is also performed by the rotating disk 40 fixed to the rotating shaft 2a, and when a notch 40a formed on the outer periphery is detected by an optical sensor (not shown), this timing is used as the lock start timing and the air cylinder is rotated. 54 gradually moves in the pressing direction, and the regulating plate 5
5 moves in the direction of the flange portion 41, the engagement plate 49 also moves in the direction of the flange portion 41, and the portion of the surface 47a of the V-shaped groove portion 47 that substantially coincides with the radial direction from the center of the rotating shaft 2a is rotated by the rotation of the motor 43. Engagement plate 4
When it reaches the position facing 9, it engages with this groove part 47. In conjunction with this movement of the engagement plate 49, the collar portion 50 engages the micro switch 6 as shown in FIG.
0 is activated and the rotation of the motor 43 is stopped. In this way, the positioning of the rotating jig main body 2 is completed, the displacement drive means 3, 4, and 5 protrude, the magnetic head is released from being held by the pressing plate 16, and the attachment/detachment device 2 is again
The leg portions 29 of the rotary jig 8 descend to attract the head disk 21 and remove it from the rotating jig main body 2. Note that since the contact surface 47a coincides with the direction of the radial surface of the rotating shaft 2a, it is tightly pressed against the engagement plate 49, allowing for accurate and highly accurate positioning, and the three displacement driving means 3, 4 , 5 is constantly applied, resulting in positioning that cannot be easily moved with less force. In FIG. 12, a curved notch 80 is formed above the L-shaped groove 47 on the upper surface of the flange portion 41 in order to prevent a large rotational load from being generated due to the contact between the flange portion 41 and the engagement plate 49. However, this is another embodiment in which a rotary plate 81 is rotatably supported on the upper surface of the distal end of the engagement plate 49 and is fitted into the notch 80. (g) Effects of the invention By using the positioning method according to the present invention, even precision parts such as video heads can be positioned completely automatically and with high reliability by a robot. Even if there is a delay in the response of the sensor or the response of the locking mechanism, the structure of this device is completely unaffected by the locking mechanism being activated at the earliest possible time. In addition, by incorporating a low-speed rotation function for positioning, positioning can be performed without damage, collision, bounce, or positioning errors due to lack of energy due to excessive rotation, and the rohot comes again to attract the three heads and fix the jig. It is possible to completely automatically wrap the heads by removing them from above, supplying the next three heads, and repeating the same operation again.

[Brief explanation of the drawing]

The drawings are all related to the present invention; FIG. 1 is a perspective view of the lock mechanism, FIG. 2 is a schematic diagram of the entire polishing device, FIG. 3 is a perspective view of the polishing device, FIG. 4 is a plan view thereof, and FIG. 5 is a head. Figure 6 is a perspective view before the disk is installed, Figure 7 is a perspective view after the head disk is installed, and Figure 7 is the X--X in Figure 5.
X' line sectional view, Figure 8 is a perspective view of the head disk,
9 is a side view of the locking mechanism, FIG. 10 is a front view of the locking mechanism, FIG. 11 is a sectional view of the attachment/detachment device, and FIG. 12 is an explanatory view of another embodiment. 2... Rotating jig main body, 6, 8... (first and second) polishing device, 7, 9... Polishing tape, 21...
Head base (magnetic head), 41... flange portion, 43... motor (driving means), 47... (R-shaped) groove portion, 49... engagement plate (lock member).

Claims (1)

[Scope of Claims] 1. A polishing device having a predetermined gap, a polishing tape mounted on the polishing device, a first position where a magnetic head is attached/detached, and a magnetic head protruding from the gap. a rotating jig main body on which the magnetic head is attached, which is movable between a second position where polishing is performed by the polishing tape; and a drive for rotating at a low speed at the first position and at a high speed at the second position. A magnetic head polishing device comprising: a flange portion that is interlocked with the drive means and has a positioning groove portion; and a lock member that engages with the groove portion when the rotating jig main body returns to the first position.