JPH0528565Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is used in fixed head digital audio tape corraders (S-DAT), VTRs, open reel decks, magnetic disk players, etc., and is used to attach the head to the recording medium. This invention relates to a fixed head type head position adjustment device whose position is adjustable.

[Prior Art] An example of a conventional head position adjustment device is shown in FIG.
It is shown in FIG. A head mounting member 12 is supported at three points on the base 10 by screws 14 and 16 and an adjustment nut 20 that is engaged with a stud 18 erected on the base 10. The magnetic head 24 is fixed by a screw.
The base 10 has studs 1 for screws 14 and 16.
A spring holding pin 26 is provided vertically passing through the side opposite to the head mounting member 1.
A compression spring 28 is interposed between the two.

The height and tilt angle of the magnetic head 24 are adjusted by rotating the screws 14 and 16, and the azimuth is adjusted by rotating the adjustment nut 20 while running the reference magnetic tape 30. Ta.

[Problems to be solved by the invention] However, since there is a distance between the straight line connecting the screws 14 and 16, which are the first and second fulcrums, and the gap position of the magnetic head 24, it is necessary to turn the stud 18 to adjust the azimuth. When the adjustment is made, the head mounting member 12 rotates about the straight line connecting the screws 14 and 16, and at this time there is a problem in that a difference in height occurs between the magnetic tape 30 and the magnetic head 24.

Also, the screw 14 for adjusting the height is attached to the magnetic tape 3.
0, it is impossible to adjust the height of the magnetic head 24 while the magnetic tape 30 is running.

The tape guide system and the magnetic head installation state adjustment system are made independent to enable precise position adjustment of each system, and the height adjustment of the composite magnetic head is made possible completely independently of the tilt adjustment and azimuth adjustment mechanisms. The object of the present invention is to provide a head position adjusting device in which a head block 40 is attached to a mechanical chassis, and tilt, azimuth, and height can be precisely adjusted even when a magnetic tape is running.

[Means for Solving the Problems] The head position adjusting device according to this invention includes a head base provided with a first stud and a second stud, and a slide guide shaft protruding from the first stud. An azimuth base supported by a stud, a rough height adjustment screw, a tilt adjustment screw, and a screw having a compression spring and fixed to the head base; and a tape guide is implanted and connected to the second stud via a compression spring. a tape guide base that is attached so as to be adjustable in the vertical direction; a height base in which a magnetic head is arranged and a hole through which the slide guide shaft is inserted via a compression spring; a slide guide for preventing deviation in the tilt direction; a height adjustment base fixed to the tip of the slide guide shaft; a height precision adjustment screw whose upper threaded portion and lower threaded portion have different pitches; The height base and the height adjustment base each include first and second nut holders formed in correspondence with the pitch of the upper threaded portion and the lower threaded portion of the adjustment screw.

[Function] According to the head position adjustment device according to this invention,
The azimuth base is fixed to a head base having a second stud to which the tape guide base is fixed by means of a rough height adjustment screw, a tilt adjustment screw, a first stud, and the like. Further, a height base on which a magnetic head is arranged is fixed to the azimuth base, and a height adjustment base is fixed to the slide guide shaft of the azimuth base by a height precision adjustment screw.

Therefore, when adjusting the head position, first
Adjust the tape guide on the tape guide base, then turn the tilt adjustment screw to adjust the tilt, then adjust the azimuth with the first stud, and finally adjust the height with the precision height adjustment screw.

Therefore, the tilt, azimuth, and height of the magnetic head can be adjusted simply by performing the above operations.

Note that displacement in the tilt direction due to vertical movement of the height base is prevented by the slide guide.

[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 6. 1 is a perspective view showing a head block equipped with a head position adjustment device according to the present invention, FIG. 2 is a plan view of the head block when a cassette is loaded, and FIG. 3 is a sectional view taken along the - line in FIG. Figure 4 is an exploded perspective view of the headblock.
FIG. 5 is a front view showing the tape guide system, and FIG. 6 is a side view of the tape guide in FIG.

First, in FIGS. 1, 2, and 4, a head base 44 is provided at the lower end of a head block 40 to be attached to a mechanical chassis with screws 42. On this head base 44, the azimuth base 46 is connected to the height coarse adjustment screw 50 and the tilt adjustment screw 5.
2. Azimuth adjustment nut 62 and spring retaining screw 5
The height and tilt angle of the composite magnetic head 48 can be adjusted by changing the distance between the head base 44 and the azimuth base 46 by rotating the tilt adjustment screw 52 and the azimuth adjustment nut 62. (tilt) and azimuth adjustments.

The azimuth base 46 has a convex shape as shown in FIG. 4, and has coarse height adjustment screws that form first and second support points in the front-rear direction (direction perpendicular to the running surface of the magnetic tape 30) at the center. 50, a tilt adjustment screw 52 is combined, and this coarse height adjustment screw 50,
An azimuth adjustment nut 62 and a spring retaining screw 56, which form third and fourth support points, are coupled in a direction perpendicular to the straight line connecting the tilt adjusting screw 52, and the spring retaining screw 56 has its head connected to the azimuth base 4.
head base 4 via a compression spring 58 between it and 6.
4 is penetrated and planted. Spring retaining screw 56
There is a compression spring 5 between the head and the azimuth base 46.
8 is interposed.

On the other hand, the stud 54 is fitted into a U-shaped groove 60 formed in the azimuth base 46, and has an azimuth adjustment nut 62 screwed onto its tip. When the spring retaining screw 56 side of the azimuth base 46 is pressed by the compression spring 58, the stud 54 side is rotated upward about the straight line connecting the rough height adjustment screw 50 and the tilt adjustment screw 52, and the azimuth adjustment nut 62 is rotated. Being pushed.

As will be described later, the height coarse adjustment screw 50 is located directly below the gap surface at the tip of the reproduction head 64 of the composite magnetic head 48.
Turn the head base 4 at the first support point by turning 0.
4 and the azimuth base 46, coarse height adjustment can be performed. Further, the tilt adjustment of the composite magnetic head 48 is performed by changing the distance between the head base 44 and the azimuth base 46 at the second support point by turning the tilt adjustment screw 52, and the azimuth adjustment is performed by turning the azimuth adjustment nut 62 at the third support point. Adjustments can be made. Further, the spring retaining screw 56 at the fourth support point is perpendicular to the point that divides the first and second support points into 21 parts.

An erasing head 70 is attached to the head base 44 on the left side of the azimuth base 46 in FIG. 4 with a screw 69 via a collar 66 and a pedestal 68. Further, as shown in FIG. 2, two studs 72 are erected on the left and right sides of the front portion of the head base 44, and two tape guide bases 74 are fitted into each pair of studs 72 as a set. A compression spring 76 is interposed between the head base 44 and the tape guide base 74 in the stud 72.
The tape guide base 74 is pressed in the direction of a tape guide height adjustment nut 78 screwed onto the tip of the tape guide base 74.

By turning the tape guide height adjustment nut 78, the positions of the two tape guide bases 74 can be adjusted independently in the height direction.

The tape guide base 74 on the left side (supply side) in FIG. A tsuzumi-shaped tape guide 86 is installed. As shown in FIGS. 5 and 6, the upper and lower ends of the magnetic tape 30 are bent by the slopes formed at the upper and lower ends of the tape guides 80 and 86 to provide stiffness, so that the magnetic tape 30 can be bent in the tape width direction. Fluttering components are removed.

The flanged tape guide 82 is a magnetic tape 30
The flanged tape guide 84 regulates the lower end of the magnetic tape 30.
The magnetic tape 30 is vertically positioned with respect to the composite magnetic head 48, and the wow component in the tape width direction is removed.

Here, as shown in FIG. 5, the center of the tape guide 80 in the width direction is positioned above the center of the magnetic tape 30 positioned by the flanged tape guide 82 and the flanged tape guide 84.
More magnetic tape 30 is applied to the slope of the lower end of the tape guide 80 than the slope of the upper end, and an upward force P _OY '-P _OY is generated in the tape guide 80 to attach the magnetic tape 30 to the flange. It may be made to abut against the flange 88 of the tape guide 82. Similarly, the widthwise center of the tsuzumi-shaped tape guide 86 is positioned below the center of the magnetic tape 30 positioned by the flanged tape guide 82 and the flanged tape guide 84, and A large number of magnetic tapes 30 are hung on the slope of the upper end portion, and a downward force P _1Y −P _1Y ′ is generated in the tape guide 86 so that the magnetic tape 30 is brought into contact with the flange 88 of the flanged tape guide 84. You may also do so. Thereby, the upper and lower ends of the magnetic tape 30 are regulated.

Note that FIGS. 7 and 8 show modified examples of the tape guide system shown in FIGS. 5 and 6, including a hollow cone-shaped tape guide 80A, a tape guide with a lower flange 82A, 84A, The Tsuzumi-shaped tape guide 86A is screwed to the tape guide base 74A with screws 92, 94, 96, and 98.

In addition, as a second modification of the tape guide system, the ninth
As shown in FIGS. 10 and 11, the tapered tape guide 80A and tapered tape guide 86A in FIG. 7 may be replaced with a lower tapered tape guide 80B and an upper tapered tape guide 86B, respectively. In this case, the lower tapered tape guide 8
The magnetic tape 30 is bent and stiffened by the 0B taper 104, and the magnetic tape 30
An upward force P _2Y is generated, which contacts the head 100 of the flanged tape guide 82A side and regulates the upper end, and similarly the upper tapered tape guide 86
The magnetic tape 30 is bent and stiffened by the taper 106 of B, and a downward force P3Y is generated on the magnetic tape 30, and the magnetic tape ₃₀ is brought into contact with the flange 102 on the side of the flanged tape guide 84A, and the lower end is regulated. Ru.

As shown in FIGS. 2 and 4, after passing through the erasing head 70, the magnetic tape 30 of the cassette 108 has a pre-guide 110 installed in the mechanical chassis, a tape guide 80 installed in the head block 40, and a tape with a flange. It runs on a guide 82, a composite magnetic head 48, a flanged tape guide 84, a tape guide 86, a capstan 112, and a pinch roller 114.

The pre-guide 110 has a tape guide structure with a flange, and can be adjusted in the height direction independently of the tape guide base 74 on the head block 40, and regulates the straightness of the magnetic tape 30 and the lower end of the tape.

Two slide guide shafts 116 are provided on the azimuth base 46 on both sides of the tilt adjustment screw 52. Holes 120 formed in the height base 118 are fitted into these slide guide shafts 116 so as to be slidable in the vertical direction.

The composite magnetic head 48 is fixed to the height base 118 by two fixing screws 122 on the left and right.
The hole on the side is an elongated hole 124, and by rotating a protrusion adjustment screw 126 screwed in the front-rear direction into the height base 118 that corresponds to the right rear of the composite magnetic head 48, the composite magnetic head 48 is fitted into the left and right guide surfaces 128 formed on the height base 118 and positioned, and the composite magnetic head 48 is adjusted.
The amount of protrusion can be adjusted.

A height adjustment base 130 is fixed to the upper end of the slide guide shaft 116 with a fixing screw 132. This height adjustment base 130 has a nut holder 1 located slightly to the left of the center near the fixing screw 132.
33 is provided, and the height precision adjustment screw 138 having an upper threaded part 134 and a lower threaded part 136 with different pitches is screwed together in the vertical direction on the upper threaded part 134 side.

The lower threaded portion 136 side of the height precision adjustment screw 138 is screwed into a nut receiver 137 provided on the height base 118 in the vertical direction. A compression spring 140 is interposed between the height base 118 and the azimuth base 46 in the slide guide shaft 116, and presses the height base 118 upward to screw the height base 118 and the height precision adjustment screw 138 together. Also, play in the height base 118 that occurs when the height precision adjustment screw 138 and the height adjustment base 130 are screwed together is eliminated.

By turning the height precision adjustment screw 138, which functions as an operating screw, the height base 118 can be slightly moved in the vertical direction by the pitch difference between the upper threaded portion 134 and the lower threaded portion 136 per rotation.

In order to prevent the height base 118 from shifting in the tilt direction while moving up and down, a slide guide 142 that slides into contact with the front left portion of the height base 118 in FIG. 2 is fixed to the azimuth base 46 with a screw 144.

The height adjustment base 130 includes a nut holder 133.
A tightening screw 146 is screwed together in the front-rear direction to make the nut receiver 133 unrotatable.

In addition, the height adjustment base 130 and the height base 118 are provided with through holes 148 and 150 above the tilt adjustment screw 52. After the head block 40 is assembled, a screwdriver is inserted through the through holes 148 and 150 from above. A tilt adjustment screw 52 can be turned.

Next, the operation of the above embodiment will be explained.

First, with the head block 40 except the composite magnetic head 48 assembled, coarse height adjustment of the height base 118 is performed by turning the coarse height adjustment screw 50 of the azimuth base 46. Then, attach the composite magnetic head 48 to the height base 118 with the fixing screw 122.
Fixed to.

Then, set the head block 40 on the adjustment table with a microscope, and turn the tape guide height adjustment nut 78 while looking at the microscope to adjust the tape guide base 74.
, and adjust the tape guide 80, tape guides 82 and 84 with flanges, and tape guide 86 so that they are at predetermined heights relative to the head base 44. Note that the amount of meandering that occurs when the magnetic tape 30 runs is determined by the following five types: the Tsuzumi-shaped tape guide 80, the flanged tape guides 82, 84, the Tsuzumi-shaped tape guide 86, and the pre-guide 110.
Since this is suppressed using two tape guides, the amount of variation is extremely small, at less than ±3 μm.

In addition, since the upper end and the lower end of the magnetic tape 30 are controlled by separate flanged tape guides 82 and 84, the processing tolerance allowed for one tape guide is relatively large, and parts costs are reduced. The cost can be reduced.

Next, while looking at the microscope, adjust the tilt adjustment screw 52.
Turn to adjust the tilt, turn the azimuth adjustment nut 62 to adjust the azimuth, turn the protrusion adjustment screw 126 to adjust the protrusion, and the height precision adjustment screw 138.
The height is precisely adjusted by turning , using the flanged tape guide 82, flange tape guide 84, etc., which have been adjusted in advance, as a reference.

In this way, since one head block 40 is equipped with both the tape guide system for position adjustment and the head installation state adjustment system, it is possible to precisely adjust the positions of each system using a microscope while removed from the mechanical chassis. becomes.

When adjusting the tilt by turning the tilt adjustment screw 52, the coarse height adjustment screw 50 is located directly below the gap forming surface of the playback head 64, and the tilt adjustment screw 52
is the magnetic tape 3 from the position of the coarse height adjustment screw 50.
0, there is almost no height fluctuation or azimuth fluctuation of the composite magnetic head 48, and even when the azimuth adjustment is performed by turning the azimuth adjustment nut 62, the height fluctuation or azimuth fluctuation of the composite magnetic head 48 is minimized. Almost no tilt fluctuation occurs.

For example, the screws engraved on the upper threaded part 134 of the height precision adjustment screw 138 and the nut receiver 133 of the height adjustment base 130 can be set to a pitch of 0.4 mm, and the lower threaded part 136 of the height precision adjustment screw 138 and the nut receiver 133 of the height adjustment base 118 are tightened. Assuming that the pitch of the screw 137 is 0.35 mm, when the height precision adjustment screw 138 is rotated once, the height adjustment base 13
Height precision adjustment screw 138 is lowered by 0.4mm relative to 0.
At the same time as the movement, the height base 118 moves upward by 0.35 mm with respect to the height precision adjustment screw 138, so that as a result, the height base 118 slightly moves downward by 0.05 mm with respect to the height adjustment base 130.

The height base 118 is disposed parallel to the azimuth base 46, and therefore, by turning the height precision adjustment screw 138, tilt and azimuth adjustments can be independently performed. Then, the slide guide 142 is connected to the height base 118.
Since the vertical movement is guided, there is almost no tilt fluctuation when performing precision height adjustment.

The precise tilt, azimuth, and height adjustments can also be performed with the head block 40 attached to the mechanical chassis and the reference magnetic tape 30 running.

[Effects of the invention] As explained above, according to the head position adjustment device according to the invention, one head block 40 is independently provided with a tape guide system for position adjustment and a head attachment state adjustment system. Therefore, it is possible to precisely adjust the relative positions of the systems using a microscope while they are removed from the mechanical chassis.

Also, when adjusting the tilt by turning the tilt adjustment screw 52, the coarse height adjustment screw 50
4, and the tilt adjustment screw 52 is located at the rear of the magnetic tape 30 in the direction perpendicular to the position of the coarse height adjustment screw 50, so there is almost no height fluctuation or azimuth fluctuation of the composite magnetic head 48. Also, when adjusting the azimuth by turning the azimuth adjustment nut 62, the composite magnetic head 4
8, there are almost no height fluctuations or tilt fluctuations.

Further, the height base 118 is arranged parallel to the azimuth base 46, and therefore, the height precision adjustment can be performed independently of the tilt and azimuth adjustments by turning the height precision adjustment screw 138. It should be noted that since the slide guide 142 guides the vertical movement of the height base 118, there is almost no tilt variation when performing precision height adjustment.

Precise tilt, azimuth, and height adjustments can also be made with the headblock 40 attached to the mechanical chassis and the reference magnetic tape 30 running.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the headblock according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a vertical sectional view taken along the - line of Fig. An exploded perspective view of the head block shown in Fig. 1.
6 is a right side view of FIG. 5, FIG. 7 is a front view of a modification of FIG. 5, FIG. 8 is a right side view of FIG. 7, FIG. 9 is a front view showing another modification of FIG. 5, and FIG. 10 is a front view of another modification of FIG.
11 is a left side view of FIG. 9, FIG. 12 is a plan view of the prior art, and FIG. 13 is a front view of FIG. 12. 44...Head base, 46...Azimuth base, 48...Combined magnetic head, 50...Height coarse adjustment screw, 52...Tilt adjustment screw, 62...Azimuth adjustment nut, 118...Height base, 1
38...Height precision adjustment screw.

Claims (1)

[Claims for Utility Model Registration] A head base 44 provided with a first stud 54 and a second stud 72, a slide guide shaft 116 protrudingly provided, and the first stud 54 and a coarse height adjustment screw. 50
, an azimuth base 46 supported by a tilt adjustment screw 52 and a screw 56 having a compression spring 58 and fixed to the head base 44; a tape guide base 74 attached vertically adjustable; and a height base 118 in which a magnetic head 48 is arranged and a hole 120 is bored through which the slide guide shaft 116 is inserted via a compression spring 140.
and a slide guide 142 for preventing displacement in the tilt direction due to vertical movement of the height base 118.
a height adjustment base 130 fixed to the tip of the slide guide shaft 116; a height precision adjustment screw 138 with a different pitch between the upper threaded portion 134 and the lower threaded portion 136; and the upper threaded portion of the height precision adjustment screw 138. 134
and first and second nut receivers 137 formed on the height base 118 and the height adjustment base 130, respectively, corresponding to the pitch of the lower threaded portion 136,
133. A head position adjustment device comprising: 133.