JPS61250818A - Head adjusting mechanism - Google Patents

Abstract

PURPOSE:To decrease wear at sliding parts when the running direction of a magnetic tape is changed over and a corresponding adjusting screw is selected by providing a couple of adjusting screws, contacting a roller with the lower end of the magnetic tape in response to the running direction of the magnetic tape and moving vertically the other end of a support. CONSTITUTION:Two rollers 68, 69 are provided so as to be rolled on a base 67. When the magnetic tape 42 runs in the direction of arrow F, the roller 68 rides on the base 67, which becomes an adjusting base for the adjusting screw 85 and when the magnetic tape 42 runs in the direction of arrow R, the roller 69 rides on the base 67, which becomes the adjusting base for the adjusting screw 86. The two rollers 68, 69 are provided because the sliding operation is made smooth by the turning of the rollers 68, 69 so as to reduce the wear at the sliding parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head adjustment mechanism.1. In particular, the present invention relates to a head adjustment mechanism that adjusts the azimuth angle of a magnetic head according to the running direction of a magnetic tape in a cassette tape recorder having an auto-reverse function.

[Prior Art] Generally, when playing back a magnetic tape in a cassette tape recorder, the most faithful playback occurs when the playback core gap of the magnetic head and the running direction of the magnetic tape, that is, the magnetic recording surface, face each other directly. .

However, due to the inclination of the head surface, the inclination of the capstan, etc., the magnetic tape usually runs in an angular direction slightly away from a predetermined position. For this reason, conventionally, one end of the base plate on which the magnetic head is attached is fixed, and the other end is slightly bent using the biasing force or elastic force of a spring.
The adjustment screw was used to adjust the facing of the recording surface and the core gap, that is, the azimuth am.

However, the inclination of the magnetic head and capstan differs for each device, and it is necessary to perform azimuth adjustment for each device. However, with cassette tape recorders that are often used these days and have an auto-reverse mechanism that allows playback of magnetic tape in both directions, if the recording surface and core gap are adjusted to face each other in the forward direction of the magnetic tape, there will be a slight deviation when the magnetic tape is running in the reverse direction. In some cases, this may occur. In such a case, the azimuth angle was adjusted by slightly shifting the best point during forward travel and finding a compromise with the best point during reverse playback. However, such an adjustment method not only requires complicated work but also causes non-uniformity in performance. So, solve this? I! To achieve this, a magnetic head azimuth adjustment device is known in Japanese Utility Model Application Laid-Open No. 58-17624, which adjusts the angle of each numbered head separately each time the magnetic tape runs, and finds the best point.

FIGS. 9 and 10 are diagrams showing the above-mentioned magnetic l\\rad azimuth adjustment device, in particular, FIG. 9 shows an external perspective view of the main part, and FIG. 10 shows a cross-sectional view of the main part.

First, a conventional azimuth adjustment device will be described with reference to FIGS. 9 and 10. The magnetic head 1 is fixed on a head mounting plate 2 composed of a leaf spring, and one end 2a of this head mounting plate 2 is mounted on a mounting base 4 fixed on a head substrate 3 that can freely reciprocate. It is attached by screws 5. On the other end 2b side of the head mounting plate 2, a hole 6 is formed. Other end 2b of head mounting plate 2
A fulcrum shaft 7 is vertically fixed on the side of the head substrate a. A rotary lever 8 having a substantially U-shaped cross section is fitted into the fulcrum shaft 7 through a pair of upper and lower through holes 9a, 9b, and the rotary lever 8 is horizontal around the axis of the fulcrum shaft 7. It is configured to be freely rotatable in the direction and slidable up and down in the axial direction.

A pair of adjustment screws 11 and 12 for adjusting the azimuth are mounted on the same circumference of the upper surface plate 8a of the rotary lever 8, both facing downward. These angle adjustment screws 11 and 12 are attached to the top plate 8.
alL: Screwed into a pair of provided screw holes 13, 14 and penetrating downward, and these angle adjustment screws 11.1
Compression springs 15 and 16 for preventing loosening are inserted between the head and the top plate 8a on the outer periphery of 2, respectively, in a pre-compressed state.

The other end 2b of the head mounting plate 2 is the bottom plate 8b of the rotating lever 8.
is abutted on the tip of the lll6 of head mounting plate 2
A height reference shaft 18 inserted through the head substrate 3 is vertically fixed on the head substrate 3, and its upper end surface is configured as a height reference surface. A washer 2 is attached to the upper end of this height reference shaft 18.
0 is fitted, and a compression spring 21 for pressing the head mounting plate is pre-compressed on the outer periphery of this height reference shaft 18 between the washer 20 and the other end 2b of the head mounting plate 2. It is inserted in the state.

Tips (lower ends) of corner adjustment screws 11 and 12 and height reference axis 18
A thin leaf spring 22 is inserted between the upper end and the height reference plane 19. This leaf spring 22 has a substantially L-shape, and one end thereof is connected to a fulcrum shaft 7 by a through hole (not shown).
A protrusion 24 that is inserted into the engagement hole 25 provided at the tip of the top plate 8a of the rotary lever 8 is inserted into the engagement hole 25 provided at the tip of the top plate 8a of the rotary lever 8.
81°゛6・0・1*3i1i 6 interlocking 1/l<-2
The tip of 61,' is connected to a part of the lower plate 8b of the rotary lever 8 via the pin 27.

Next, a method for adjusting the azimuth angle in the conventional azimuth adjustment device described above will be explained. When the magnetic tape 29 runs in the forward direction, the interlocking lever 26 is moved in the direction of arrow C in FIG. 9, and the rotary lever 8 is rotated in the direction of arrow d. As a result, the tip (lower end) of one adjustment screw 11 comes into contact with the height reference surface 19 at the upper end of the height reference shaft 18 via the leaf spring 22, and the rotary lever 8 moves along the fulcrum shaft 7 with the arrow e.
direction by the compression spring 21. Then, at the tip of the lower plate 8b of the rotary lever 8, the head mounting plate 2 is pushed down by its own elasticity and the compression spring 21 (thus, the head mounting plate 2 is bent by a predetermined angle in the direction of the arrow "," and the magnetic head 1 is In this forward running state, by adjusting the adjusting screw 11, the rotary lever 8 is tilted along the fulcrum shaft 7 by the action of the compression spring 21. The azimuth adjustment (verticality adjustment of the gap) of the magnetic head 1 can be performed by adjusting the movement of the magnetic head 1 and adjusting the bending angle of the rad plate 2.

On the other hand, when the f1m tape 29 runs in the opposite direction, the interlocking lever 26 moves in the direction of arrow i, and the rotating lever 8 moves in the direction of arrow j.
The rotation is adjusted in the direction. As a result, the other adjustment screw 12
The tip @ (1; end) contacts the height reference surface 19 at the upper end of the height reference shaft 18 via the leaf spring 22, and the rotary lever 8 is mounted on the fulcrum shaft 7 and compresses the spring in the direction of arrow e. 21. Note that the spring 22 is bent at this time. As the surface plate 81 of the rotary lever 8 moves, the other end 2b side of the head mounting plate 2 has its own elasticity and compression spring 2.
1, the head mounting plate 2 is bent by a predetermined angle in the direction of the arrow. As a result, the magnetic head 1 is tilted at a predetermined angle. By adjusting the adjusting screw 12 while running in the reverse direction, the rotary lever 8 can be adjusted to move up and down along the fulcrum shaft 7 due to the cooperation with the compression spring 21, and the deflection angle of the head mounting plate 2 can be adjusted. The azimuth adjustment (adjustment of the perpendicularity of the gap) of the magnetic head 1 can be performed by using the magnetic head 1.

[Problems to be Solved by the Invention] In the above-described azimuth adjustment device, it is necessary to adjust the azimuth angle using the adjustment screw 11 when traveling in the forward direction, and to adjust the azimuth angle using the adjustment screw 12 when traveling in the reverse direction. However, unless you remember that the adjusting screw 11 corresponds to when traveling in the forward direction and the adjusting screw 12 corresponds to when traveling in the reverse direction, you will not know which adjusting screw to turn to adjust the azimuth angle in which direction. The problem was that it would disappear.

Further, in the above-mentioned azimuth adjusting device, both adjusting screws 11.
Since the lower end of the reference shaft 12 contacts the tip of the reference shaft 18 via the thin leaf spring 22, the reference shaft 1
There is a possibility that the tip of the rotary lever 8 will wear out and the rotational movement of the rotary lever 8 will not be smooth. Moreover, if the tip of the reference shaft 18 wears out, there is a drawback that the azimuth angle adjusted by both adjusting screws 11 and 12 becomes incorrect.

Therefore, the main object of the present invention is to provide a head adjustment mechanism that can reduce wear on the sliding parts when switching the running direction of the magnetic tape and select the corresponding adjustment screw, and can withstand many years of use. It is to be.

[Means for Solving the Problems] In the present invention, a pair of left and right pinch rollers are provided, and depending on the running direction of the magnetic tape, one of the pinch rollers comes into contact with the magnetic tape to prevent the magnetic tape from moving. When running, adjust the azimuth angle of the magnetic head by 1 depending on the running direction.
! ! Head adjustment for ii! The structure is such that one end of the support on which the magnetic head is attached is fixed, and a pair of adjustment screws are provided at the other end to adjust the azimuth angle according to the running direction of the magnetic tape. The magnetic tape is configured so that a roller is brought into contact with the lower end of the magnetic tape and the other end of the support is moved up and down depending on the running direction.

[Function 1] In the head adjustment mechanism of the present invention, the roller is moved so as to come into contact with the lower ends of the pair of adjustment screws, depending on the running direction of the magnetic tape, thereby reducing wear on the sliding parts. It is possible to make the operation smoother when selecting either one of the pair of W4 setting screws, and to reduce wear. Embodiment] Fig. 1 is a diagram showing the overall structure of a car stereo to which an embodiment of the present invention is applied. First, the structure of the main parts of the car stereo will be described with reference to Fig. 1. The main base 31 is mainly provided with a motor 32, flywheels 33, 34, and reel rests 35 and 36. Rotational force is transmitted from the motor 32 to the flywheels 33, 34 through a belt 37. , a capstan 38 is provided, and this capstan 38 runs the magnetic tape 42 in the forward direction (F) together with a pinch roller 39.
A capstan 40 is attached to the magnetic tape 42 along with a pinch roller 41.
Run in the opposite direction (R). In addition, main base 3
1 is provided with a base head 60 provided with an azimuth adjustment mechanism, which is a feature of the present invention. A cam plate head 50 is provided on the back side of the main base 31 of the base head 60.

FIG. 2 is an exploded perspective view of one embodiment of the present invention, and FIG.
The figure is an external view of the sliding plate 70 included in FIG.
The figure is a longitudinal sectional view of an embodiment of the present invention.

Next, the configuration of the azimuth adjustment mechanism will be described with reference to FIGS. 2 to 4. The head adjustment mechanism mainly includes a cam plate head 50, a base head 60, a sliding plate 70, and a head support 80. Guide grooves 54 and 55 are formed in the cam plate head 50, into which a bottle (not shown) is inserted. The cam plate head 50 moves in the direction of arrow F when the magnetic tape 42 is running in the forward direction, and moves in the direction of arrow R when moving in the reverse direction. Additionally, cams 52 and 53 are formed at both ends of the cam plate head 50. When the cam plate head 50 moves in the direction of arrow F, the pin of the pinch roller 39 shown in FIG.
2 in the forward direction. In addition, the cam plate head 5
0 moves in the direction of arrow R, the pin of the pinch roller 41 engages with the cam 53, brings the pinch roller 41 into close contact with the capstan 40, and causes the magnetic tape 42 to run in the opposite direction. Furthermore, the cam plate head 50 has a cam hole 5.
1 is formed. The cam hole 51 is into which a sliding pin 71 formed on the sliding plate 70 is inserted, and has portions 511 and 512 with which the sliding pin 71 comes into contact.

The base head 60 is mainly used to attach the magnetic head 43 and the head support 80. The base head 60 is formed with an oval relief hole 61 into which the sliding pin 71 of the sliding plate 70 is inserted, and a head fixing pin 62 for fixing the magnetic head 43 is attached near the hole 61. . The base head 60 also includes two bins 65.6.
6 is provided. These bins 65 and 66 are connected to the sliding plate 70
This controls the sliding movement of the A half-opened base 67 is formed between the bins 65 and 66. And base 6
2, which is one feature of this invention, as it rolls on top of 7.
Two rollers 68,69 are provided. When the magnetic tape 42 runs in the direction of arrow F, a roller 68 rides on the base 67 as shown in FIG.
When the magnetic tape 42 runs in the direction of arrow R, the roller 69 rides on it, and serves as an adjustment base for an adjustment screw 86, which will be described later. The reason why the two rollers 68 and 69 are provided in this way is to make the sliding movement smooth by the rotation of the rollers 68 and 69, and to reduce wear on a portion of the slide 13. Furthermore, the base head 60 includes a fixed guide bin 63 and a guide bin 6.
4 is provided. The fixed guide bin 63 serves as a sliding reference for the adjustment table 83 to be described later to slide in the vertical direction, and the guide bin 64 serves as a guide when the adjustment table 83 slides in the vertical direction. .

The sliding plate 70 slides on the base and the head 60 in the direction of arrow F or the direction of arrow R. A sliding pin 71 is formed at one end of the sliding plate 70 to protrude downward, and a long groove 72 is formed at the other end.

Furthermore, an oblong hole 73 is formed on the sliding pin 71 side of the sliding plate 70 . A bottle 65 of the base head 60 is inserted into the long groove 72, and a bottle 66 is similarly inserted into the oblong hole 73. Furthermore, a roller 6 is provided between the long groove 72 and the oblong hole 73.
Roller insertion holes 74 for inserting rollers B and 89, respectively.
75 is formed.

Therefore, the sliding plate 70 moves the sliding bottle 71 through the escape hole 61 of the base head 60 to the cam play head 50.
When the cam plate head 50 moves in the direction of the arrow F, the sliding pin 7'1 contacts the end 5121 of the cam hole 51 and slides the collapsing plate 70 in the direction of the arrow F. Saseru. Further, when the cam play 1-head 50 slides in the direction of the arrow Rh, W! JvJl: 'Sif 1 Kakam hole 511
The sliding iQ root 70 slides in the direction of arrow R.

The head support 80 supports the magnetic head 43. That is, the magnetic head 43 is fixed to the base plate 81. A through hole is formed at one end of the base plate 81 for screwing the rad fixed pin 62 of the base head 60 with a set screw 87, and a groove for inserting the fixed guide pin 63 at the other end. is formed. Roughly speaking, a head pressing spring 82 having a force to press the base plate 8'1 in one direction with the head fixing pin 62 at the center is used. C-J is done. A set screw 8 is attached to one end of this head pressing spring 82 along with a base plate 81.
A through hole for screwing the head fixing pin 62 is formed at 7, and a long groove for inserting the fixed guide pin 62 is formed at the other end. One end of the base plate 81 and the head pressing spring 82 is screwed onto the head fixing pin 62 by a set screw 87, and the other end of each is inserted into the fixed guide pin 63.

The adjustment table 83 has a fixed guide bin 63 and a guide bin 64.
It slides vertically along the

For this purpose, screw holes for screwing adjustment screws 85 and 86 are formed in the adjustment table 83 along the running direction of the magnetic tape 42. The adjusting screw 85 adjusts the azimuth angle of the magnetic head 43 when the magnetic tape 12 runs in the direction of arrow F, and the adjusting screw 86 adjusts the azimuth angle of the magnetic head 43 when the magnetic tape 42 runs in the direction of arrow R.
This is to adjust the azimuth angle of No. 3. Therefore, the adjusting screw 85 corresponds to the direction when the magnetic tape 42 runs in the forward direction, and the adjusting screw 86 corresponds to the direction when the magnetic tape 42 runs in the reverse direction. Therefore, when adjusting the azimuth angle of the magnetic head 43, by turning the adjusting screw on the side facing the running direction of the magnetic tape 42, the azimuth angle can be adjusted in accordance with that direction.

Fig. 5 is a plan view of the head adjustment mechanism when the magnetic tape is running in the forward direction, and Fig. 6 is a front view of the same. Fig. 7 is the head adjustment mechanism when the magnetic tape is running in the reverse direction. Figures 1 and 3 are also front views.

Next, with reference to FIGS. 5 and 6, the magnetic tape 4 is
Azimuth adjustment of the magnetic head 43 when the magnetic head 2 is traveling in the forward direction will be described. GJ when driving in the forward direction
When adjusting the azimuth of the magnetic head 43, the adjustment screw 85 facing in the positive direction of the magnetic tape 42 is adjusted to adjust the perpendicularity of the gap of the magnetic head 43 with respect to the tape center of the magnetic tape 42. When traveling in the forward direction, the cam plate head 50 slides in the direction of arrow R, and the roller 5
6 is removed from the cam 52, and the pinch roller 39 shown in FIG. 1 is pressed against the capstan 38 via the magnetic tape 42 by a clockwise biased spring (not shown). Then, the capstan 38 rotates counterclockwise,
The magnetic tape 42 runs in the forward direction, that is, in the direction of arrow F. On the other hand, the roller 57 for running in the reverse direction comes into contact with the cam 53, and the rotation of the pinch roller 41 for running in the reverse direction is restricted.

As the head 50 slides toward the cam play 1 in the R direction, the end 511 of the cam hole 51 pushes the sliding pin 71 of the sliding plate 70 in the R direction. Therefore, the sliding plate 70 also slides in the R direction. At this time, the roller insertion hole 74 of the sliding plate 70.
The rollers 68 and 69 inserted in the roller 75 also move while rotating in the R direction. Even if the sliding plate 70 slides in the R direction,
The bottle 65 of the base head 60 stops at the position where it comes into contact with the length 172 of the sliding plate 7o. At this time, the roller 68 is
7 and push up the adjustment screw 85 side of the holding plate 84. When the adjustment screw 85 side of the holding plate 84 is pushed upward, the adjustment table 83 is also pushed up by the amount adjusted by the adjustment screw 85. The adjustment table 83 pushes up the other end of the base plate 81 against the head pressing spring 82. By turning the adjustment screw 85 in this state, the perpendicularity of the gap between the magnetic head 43 and the tape center when the magnetic tape 42 is running in the forward direction can be adjusted.

Next, azimuth adjustment when the magnetic tape 42 runs in the reverse direction will be explained. When traveling in the reverse direction, the cam plate head 50 slides in the direction of arrow F. Then, the roller 57 comes off the cam 53, and the pinch roller 41 shown in FIG. 1 comes into pressure contact with the capstan 40 via the magnetic tape 42. Therefore, the capstan 40 rotates clockwise, and the magnetic tape 42 runs in the opposite direction, that is, in the direction of arrow R. On the other hand, the O-roller 56 comes into contact with the cam 52, and the rotation of the pinch roller 39 for forward running is stopped.

By sliding the cam plate head 50 in the SF direction, the end portion 512 of the cam hole 51 pushes the sliding pin 71 in the F direction, and therefore the sliding plate 70 slides in the F direction. At this time, the rollers 68 and 69 inserted into the roller insertion holes 74 and 75 of the sliding plate 70 also move while rotating in the F direction. Then, the roller 69 rides on the base 67 and pushes the adjustment screw 86 side of the holding plate 84 upward. Holding plate 8
When the adjustment screw 85 side of No. 4 is pushed upward, the adjustment screw 86 and the adjustment stand 83 are also pushed upward. The adjustment table 83 pushes up the other end of the base plate 81 against the head pressing spring 82. By turning the adjustment screw 86 in this state, the perpendicularity of the gap between the magnetic head 43 and the tape center when the magnetic tape 42 runs in the reverse direction can be adjusted.

[Effects of the Invention] As described above, according to the present invention, a magnetic head is mounted; one end of the support is fixed, and a pair of supports are provided at the other end for adjusting the azimuth angle according to the running direction of the magnetic tape. The adjustment screws are screwed together, and the roller is rotated according to the running direction of the magnetic tape so that it comes into contact with the lower part of one of the pair of adjustment screws and moves the other end of the support up and down. Therefore, the operation for selecting a pair of adjustment screws can be made smooth. Furthermore, since the roller is rotated so as to come into contact with the lower part of the adjustment screw, wear on the sliding portion can be reduced and azimuth adjustment will not be disturbed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing 11 overall configurations of a car stereo to which an embodiment of the present invention is applied. FIG. 2 is an exploded perspective view of one embodiment of the present invention. FIG. 3 is an external view of the sliding plate included in FIG. 1. FIG. 4 is a longitudinal sectional view of one embodiment of the present invention. Figure 5 shows the magnetic tape running in the forward direction 11.
It is a top view of the head adjustment mechanism in FIG. Figure 6 is also a front view. FIG. 7 is a plan view of the head adjustment mechanism in C- position when the magnetic tape is running in the reverse direction. It is also a front view as in Figure 8. FIG. 9 is an external perspective view of a main part of a conventional magnetic helix azimuth adjustment device. FIG. 10 is also a sectional view of the main part. In the figure, 42 is a magnetic tape, 43 is a magnetic head, and 5 is a magnetic tape.
0 is force 11 plate head, 51 is cam hole, 60 is base head, 62 is head fixing bin, 63 is fixed guide pin, 64 is guide bin, 65° 66 is pin, 67 is base, 68.69 is roller , 70 is a sliding plate, 71 is a sliding pin, 72 G, i long groove, 73 is an oblong hole, 74.75 is a roller insertion hole, 80 is a head support, 81 is a base plate, 82 is a head presser, 83 is an adjustment table, 84 is a holding plate, 85.8
6 does not show an adjustment screw.

Claims (1)

[Claims] A pair of left and right pinch rollers is provided, and depending on the running direction of the magnetic tape, one of the pinch rollers comes into contact with the magnetic tape, and when the magnetic tape is running, one of the pinch rollers comes into contact with the magnetic tape. a head adjusting mechanism for adjusting the azimuth angle of the magnetic head according to the running direction of the magnetic tape, one end of which is fixed, a support for supporting the magnetic head; each of the left and right pinch points; a pair of adjustment screws provided corresponding to the rollers and screwed onto the other end of the support for adjusting the azimuth angle of the magnetic head according to the running direction of the magnetic tape; A pinch roller is movably provided at the bottom of the adjustment screw and contacts the magnetic tape depending on the running direction of the magnetic tape. Head adjustment mechanism with rollers to move the head.