JPS6137684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of adjusting a magnetic head that performs recording and reproduction by rotating in a spiral manner.

In conventional sheet-type recording/playback machines, the azimuth of the magnetic head's gap and the distance from the center of rotation of the turntable were adjusted after the magnetic head was set on the recorder/player, but the rotation radius was 20mm.
The following have the disadvantage that even if the mounting position of the magnetic head is slightly deviated from the normal position in the tangential direction, the azimuth deviation will become large and the frequency characteristics of the reproduced sound will deteriorate; In playback machines, it is extremely difficult to mount the magnetic head directly on the recorder/playback machine without causing even the slightest misalignment.
The drawback was that assembly was inefficient.

It is an object of the present invention to make it possible to adjust the positional deviation and azimuth of a magnetic head gap in a head unit, and to make it possible to accurately set a guide axis for guiding a turntable including the head unit with respect to the turntable. To provide a device for adjusting the mounting position of a magnetic head so that the gap of the magnetic head core runs at right angles to the rotating locus of the magnetic head with respect to the recording track of a sheet.

The present invention will be explained below with reference to the illustrated embodiments.

Figure 1 shows a plan view showing the main parts of a small sheet-type recording/playback machine, in which turntable 1 has shaft 2.
A guide shaft 5 is rotatably mounted on rising portions 4a and 4b of a bracket 4, which is fixed to the turntable 1 by a plurality of screws 3. It is prevented from coming off by rings 6 and 7. A feed shaft 9 is plugged into the auxiliary bracket 8 fixed to the turntable 1 and the rising portion 4a, and a feed screw 11 provided integrally with the feed shaft 9 is rotated by a drive unit (not shown). It's becoming like that. The guide shaft 5 has bent portions 12a, 12 of the movable table 12.
b is fitted in a slidable manner, and a long hole 12c (see FIG. 2), which is open at one end provided in the bent portion 12b of the moving table 12, is slidably attached to one end of the feed shaft 9. has been done. The moving table 12 is
The bending piece 12d provided on this, the rising portion 4b of the bracket 4, and the elasticity of the tension spring 13, each end of which is locked, give it the habit of moving downward in the figure. A part of the feed member (not shown) provided on the feed screw 12 is meshed with the feed screw 11, and as the turntable 1 rotates and the feed shaft 9 is rotated, the feed screw 11 is moved to the movable base 12. is moved upward in the figure along the guide shaft 5.

The base of the adjustment table 14 is rotatably attached to the back side of the arm 12e provided on the movable table 12 by an eccentric shaft 15 (see FIG. 3). An adjustment screw 16 passing through the rising portion 12b of the movable table 12 is screwed into the provided bent portion 14a. Due to the elasticity of an extensible spring 17 fitted to the adjustment screw 16, the adjustment table is given the ability to rotate counterclockwise in the figure, and by pressing the head of the adjustment screw 16 against the rising portion 12b. The adjustment table 14 is held in the illustrated position so as to be freely adjustable. In FIG. 2, the adjustment table 14
The base of a fixing pin 18 is fixedly planted on the free end of the support plate 19, and a sleeve 21 fixed to one end of the support plate 19 is loosely fitted to the fixing pin 18.
It is supported by a spring 22 fitted around it. A magnetic head 23 is located in the center of the support plate 19.
is fixed, and the other is a long hole 19a drilled.
is fitted into the guide pin 24, and the end of the support plate 19 is supported by a spring 25 provided around the guide pin 24. The eccentric shaft 15 has an eccentric portion 15a as shown in FIG.
By tightening b, the eccentric pin 15 is fixed to the arm portion 12e. The knurl 24a formed on the guide pin 24 is for holding the guide pin 24 when tightening the eccentric shaft 15, and after adjusting and rotating the eccentric shaft 15 as described later, it is fixed. As a result, the position of the adjustment table 14 is adjusted.

Now, in FIG. 5, the magnetic head 23 (first
If the position of the gap 23a (see figure) is tangentially shifted by a from the normal position on the center line 26, then the radius of the recording track is R, and the gap 23a
3a, the angular deviation θ=tan ^- ₁ (a/R) is as shown in Fig. 6. As can be seen from the figure, the angular deviation θ becomes larger as the recording track radius R becomes smaller. Moreover, the influence of the positional deviation a has become extremely large. Therefore, in a sheet-type recording/playback machine where the recording track radius R and its pitch are small, it is necessary to adjust these to prevent positional deviation a, and to set the gap position to the normal position. , it is necessary to always point toward the center to eliminate angular deviation. A method of adjusting the gap 23a of the magnetic head 23 according to the present invention will be described below.

First, the adjustment table 14 was temporarily fixed to the moving table 12 by the eccentric shaft 15 and the guide pin 24 as shown in FIG. 3, and then the springs 22 and 25 were arranged as shown in FIG. Later, magnetic head 23
A support plate 19, which is substantially integral with the support plate 19, is attached to the fixing pin 18 and the guide pin 24, respectively, thereby forming a head unit generally designated by the reference numeral 27. The moving platform 12 including this head unit 27
is the support member 2 of the microscope 28 as shown in FIG.
It is attached to a reference shaft 31 which can be freely inserted into and removed from 9 and 30. The reference axis 31 is arranged at a constant distance l from the vertical reference line 32 of the measuring section of the microscope 28,
The gap 23a of the magnetic head 23 is aligned with the vertical reference line 32.
The eccentric shaft 15 is rotated to adjust the positional deviation. In addition to the reference shaft 31 described above, the moving table 12 is also supported by a guide shaft 33 provided on the microscope 28.

The head unit 27, in which the positional deviation of the gap 23a has been adjusted in this way, is set in the azimuth adjuster 35, as shown in FIG. This azimuth adjuster 35 is, for example, a modified version of a general tape recorder, and is designed to invert the magnetic surface of the master tape 36 so that it can come into contact with the magnetic head 23, and is connected to the head unit 27. The moving table 12, as shown in FIG.
A guide shaft 38 provided on the azimuth adjuster 27,
It is installed on 39. A test signal is recorded on the master tape 36, and while the test signal is being reproduced by the magnetic head 23, the azimuth of the gap 23a is adjusted so that the output level is maximized. Adjustment of this angular shift is performed by turning the adjustment screw and rotating the adjustment table 14 around the eccentric shaft 15. In this way,
The relative position of the magnetic head 23 with respect to the moving table 12 can be determined by rotating the eccentric shaft 15 and moving the adjustment plate 14 in the lateral direction (perpendicular to the guide shaft 5) in FIG. The adjustment is made, and the angular shift is also adjusted by operating the adjusting screw 16 in the azimuth adjuster 35 and rotating the free end of the adjusting table 14. However, since the moving action of the moving table 12 is performed with reference to the guide shaft 5, the distance from the rotating shaft 2 to the guide shaft 5 must be accurately positioned. If there is even a slight difference between each turntable, there is a problem that the core gap angle and the gap angle of the magnetic head 23 will not match when recording a recording track of a sheet (not shown) recorded by another machine. be.

9 and 10 show a device for positioning the guide shaft 5, and a boss 42 fixed to the back surface of the turntable 1 with a screw 41 is attached to a jig 43.
The pin 45 is inserted into the shaft 44 fixed to the turntable 1, and the pin 45 fixed to the jig 43 is inserted into the shaft 44 fixed to the turntable 1.
The turntable 1 is fitted into a hole 46 drilled in the hole 46 to prevent the turntable 1 from rotating. The bracket 4 is placed on a turntable, a jig guide shaft 46 is fitted thereto, and a jig 47 is fitted to the shaft 44 and the pin.
When the jig 47 is mounted, the grooves 47c provided in the arms 47a, 47b of the jig 47 fit into the guide shaft 46 as shown in FIG. 10, and the jig 47 can be positioned.
In this state, the bracket 4 is fixed at a predetermined position on the turntable by tightening the plurality of screws 3, and this operation is performed by tightening the plurality of screws 3.
By doing so, a large number of turntables 1 with accurately positioned brackets 4 can be obtained. The guide shaft 46 for the jig corresponds to the guide shaft 5 shown in FIG. By attaching the completed moving table 12, the position of the gap can be adjusted accurately.

According to the present invention, the base of the adjustment table that supports the magnetic head is attached to the movable table with an eccentric shaft, and the gap position is adjusted by operating the eccentric shaft, and the free end of the adjustment table is connected to the adjustment screw. By adjusting , the azimuth of the gap is adjusted. By using a jig to set the guide axis of the movable base at a predetermined position on the turntable, it becomes possible to adjust the position of the magnetic head that performs normal spiral motion. The machine can be assembled easily.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main parts of a sheet-type recording/reproducing machine to which the magnetic head adjustment method of the present invention is applied, FIG. 2 is a side view of the same, and FIG. 3 is a front view of the eccentric shaft.
Fig. 4 is a plan view of the microscope jig, Fig. 5 is a diagram showing gap positional deviation, Fig. 6 is a diagram showing the relationship between recording track radius and gap position deviation amount, and gap azimuth deviation. The figure is a front view of the azimuth adjuster, FIG. 8 is a rear view of the same, FIG. 9 is a plan view of the device for positioning the guide shaft, and FIG. 10 is a cross-sectional view of the center of the same. 1... Turntable, 4... Bracket, 5
... Guide shaft, 12 ... Moving table, 14 ... Adjustment table, 15 ... Eccentric shaft, 16 ... Adjustment screw, 18 ...
... Fixed pin, 24 ... Guide pin, 23 ... Magnetic head, 23a ... Gap, 27 ... Head unit, 32 ... Base line of microscope, 35 ... Azimuth adjuster, 36 ... Master tape, 43, 47
... Bracket positioning jig, 46... Guide shaft for jig.

Claims (1)

[Claims] 1. In a device having a movable base that is fed in the radial direction by a guide shaft and a feed shaft that are provided parallel to each other on a turntable, an adjustment plate whose one end is rotatably pivoted to the movable base about an eccentric shaft. A magnetic head is mounted so as to be movable up and down with respect to the fixed pin fixed to the free end and the eccentric shaft, and an adjusting screw for swinging the adjusting plate about the eccentric shaft is attached to the moving table. The head unit configured as described above is attached to a predetermined position of the microscope, and the adjustment plate is moved by rotating the eccentric shaft, thereby adjusting the positional deviation of the gap of the magnetic head,
Attach the above head unit to an azimuth adjuster equipped with a master tape on which the test signal has been recorded, operate the above adjustment screw to obtain the highest level of the playback signal, adjust the azimuth of the gap of the magnetic head, and turn the turntable. is attached to a jig for determining the distance between its center of rotation and the guide shaft, and after positioning the guide shaft with respect to the turntable, place the bracket that supports this guide shaft in place on the turntable. A magnetic head adjustment method consisting of fixing the magnetic head with screws.