JPH0319057Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a magnetic head adjustment device that can easily adjust the height and angle of a magnetic head.

Prior Art A conventional head adjustment mechanism is configured to adjust the height, the left-right angle of the head, and the front-back angle of the head by moving three screws back and forth. With this type of adjustment mechanism, when you adjust the left-right angle of the head, generally called the azimuth, or the front-back angle of the head, generally called the swing angle, the head height changes, and conversely, when you adjust the height, the head height changes. The angle has changed. Therefore, it took a considerable amount of time to set the target angle and height.

Purpose of the invention Therefore, the purpose of the present invention is to provide a head adjustment device that can easily adjust the height and angle of the head.

Structure of the Invention To achieve the above object, the present invention includes a magnetic head for recording or reproducing in contact with a magnetic tape, and a magnetic head that is fixedly fixed and perpendicular to the gap plane of the magnetic head. a head mounting plate disposed on the head mounting plate; and a head support substrate disposed substantially parallel to the head mounting plate and formed so as to be able to adjust the angle of the magnetic head with respect to the running direction of the magnetic tape. an adjustment mechanism for displacing the head support substrate so as to adjust the angle of the magnetic head with respect to the tape running direction; and a height position of the gap of the magnetic head without changing the angle of the magnetic head with respect to the tape running direction. first and second magnetic heads, which penetrate the head support substrate and are screwed into the head mounting plate, and are set so that the distances from the gap surface of the magnetic head are equal to each other.
a screw located at a position where the distance from the gap surface is greater than that of the first and second screws and penetrating the head support substrate in order to adjust the angle of the magnetic head with respect to the main surface of the magnetic tape; a third screw screwed into the head mounting plate; first, second, and third gears provided on the first, second, and third screws, respectively; The height of the magnetic head can be adjusted by meshing with the second gear, and the height of the magnetic head and the magnetic head can be adjusted by meshing with the first, second, and third gears, respectively. an engagement gear arranged so as to be able to adjust the angle with respect to the main surface of the tape, and a distance from the gap surface of the magnetic head to the center line of the first and second screws. L ₁ is the distance from the gap surface to the center line of the third screw, L ₂ is the distance between the first and second screws.
The first and second gears are adjusted so that the relationship L ₁ /L ₂ =L ₂ /L ₁ holds, where Z ₁ is the number of teeth of each gear, and Z ₂ is the number of teeth of the third gear. The present invention relates to a magnetic head adjusting device in which the third gear and the third gear are configured.

Effects of the invention According to the above invention, the first and second screws are mainly involved in adjusting the height of the head, and the third screw is involved in adjusting the angle of the head with respect to the main surface of the tape (angle in the front-rear direction). are meshed with each other by the first, second, and third gears so that they move forward and backward at a predetermined ratio, making it possible to adjust the angle of the head relative to the main surface of the tape while correcting the height. It becomes possible. Therefore, the angle and height of the head can be adjusted within a short time.

Embodiment Next, a magnetic head adjusting device according to an embodiment of the present invention shown in FIGS. 1 to 4 will be described. A magnetic head 2 having a gap 1 is fixed to a head mounting plate 3. Magnetic tape 4 is attached to the head mounting plate 3.
First and second screw holes 5, 6 along the running direction of the
A third screw hole 6 is provided behind the second screw hole 6.
A screw hole 7 is provided. These screw holes 5, 6, 7 have first, second and third screws 12 extending through first, second and third through holes 9, 10, 11 of the head support board 8. , 13 and 14 are screwed together. These first, second and third screws 1
2, 13, 14 are the first, second and third gears 1
It has 5, 16, and 17. These gears 15,1
6 and 17 function as the heads of screws 12, 13 and 14 and are in contact with the head support substrate 8. Therefore,
The head 2 is supported in a suspended state by three screws 12, 13, and 14. Reference numeral 18 denotes an engagement gear (fourth gear) for relating the three gears 15 to 17 to each other, and is fixed to the shaft 19. The shaft 19 is movably inserted into the hole 20 of the head support substrate 8 in a manner that prevents it from coming off.
Since coil springs 21, 22, 23, and 24 are wound around the three screws 12 to 14 and the shaft 19 so that they can be elastically contracted, the head mounting plate 3 and the head 2 are always positioned downward in FIGS. 1 and 2. The engagement gear 18 is always biased upward. In addition, the engagement gear 18 is connected to the first and second gears in a state in which it is not pressed.
The spring 24 engages only the gears 15 and 16 of the
It is configured to engage with the first, second, and third gears 15, 16, and 17 when pressed against it. Further, the first screw 12 and the second screw 13 are arranged at symmetrical positions with respect to the gap 1, and are arranged at equal distances from the gap surface 2a.

A mechanism 25 that changes the angle of the head support board 8 in order to adjust the angle of the tape running direction of the head 2 (the angle in the left-right direction) consists of a pair of support stands 27 and 28 disposed on the main board 26, and a right side support. A pivot 29 for rotatably supporting the right end of the head support board 8 on the stand 28, and a screw 30 for movably holding the left end of the head support board 8 on the left support base 27.
and a spring 31 that biases the support substrate 8 upward. Note that the screw 26 passes through a through hole 32 of the support substrate 8 and is screwed into a screw hole 33 of the support base 27.

In this device, the first, second and third screws 1
2, 13, and 14 are screws of the same pitch and diameter. Further, as shown in FIG. 4, the first and second screws 12, 1
L ₁ is the distance to the center line of the third screw 14, L ₂ is the distance from the gap surface 2a to the center line of the third screw 14, Z ₁ is the number of teeth of the first and second gears 15 and 16, When the number of teeth of the gear 17 is Z ₂ , each value is set so that the relationship L ₁ /L ₂ =Z ₂ /Z ₁ holds.

Next, it will be explained that the height and angle of the head 2 can be easily adjusted using the adjustment mechanism as described above. First, when adjusting the horizontal angle of the head 2 (angle with respect to the tape running direction), turn the azimuth adjustment screw 30. As a result, the head support substrate 8 rotates about the shaft 29, and the angle of the head 2 with respect to the tape running direction is adjusted.

Next, when adjusting the height of head 2, the first
and turn either one of the second screws 12, 13. The first and second screws 12 and 13 have gears 15 and 16 with the same number of teeth, and these mesh with the gear 18, so the rotation of one screw is transmitted to the other and under the same conditions. Move forward and backward, head mounting plate 3
moves parallel to the substrate 8. That is, head 2
The height of the head 2 can be adjusted without changing the horizontal angle of the head.

Next, when adjusting the angle of the head with respect to the surface of the tape 4 (angle in the front-rear direction), use the engagement gear 18.
by pushing against the spring 24, the three gears 15,
Turn with 16 and 17 engaged. As a result, the first and second screws 12, 13 and the third screw 14 move forward or backward at a constant ratio, and the head 2
The height is corrected and the angle in the front-rear direction is adjusted.

FIG. 4 is a diagram for explaining the angle adjustment of the head 2 in the longitudinal direction. If the engagement gear 18 were not used and the screw 14 was used to adjust the angle in the front and back direction, the head 2 would rotate from the position shown by the dotted line to the position shown by the solid line using the screws 12 and 13 as fulcrums. The desired angle is obtained. However, gap surface 2
a and the height of gap 1 change by H ₁ . That is, there is a difference in height _H1 between the chain line 34 extending horizontally through the end of the gap surface 2a and the position of the head 2 shown by the solid line.

On the other hand, in this embodiment, the gear ratio of gears 15, 16 and gear 17 is set to Z ₂ /Z ₁ =L ₁ /L ₂ =H ₁ /H ₂ , so the angle in the front and back direction can be adjusted. For example _, if the third screw 14 is moved back by a height H ₂ as shown in FIG. A state is obtained in which only the angle is adjusted while keeping the surface 2a at the initial height.

As is clear from the above, according to this embodiment, it is possible to easily and accurately adjust the horizontal and longitudinal angles of the head 2 and the height of the head.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and can be further modified. For example, the heads of the screws 12 to 14 and the gears 15 to 17 may be configured separately. Although one gear 18 is configured to mesh with three gears 15 to 17, the first gear 15 and the second gear 16
a transmission gear for interlocking the third gear 1, and a third gear 1.
7 and gears meshing with the second gear 16 or the first gear 15, respectively, may be provided. Instead of using a combination of a shaft 29 and a screw 30 for the left-right angle adjustment mechanism 25, for example, instead of the shaft 29, the right end of the board 8 is also supported by a screw, and the movement of this screw and the movement of the other screw 30 are controlled. The angle may be adjusted by

[Brief explanation of the drawing]

Fig. 1 is a front view showing a head adjustment device according to an embodiment of the present invention, Fig. 2 is a sectional view showing a part of the - line in Fig. 1, and Fig. 3 is a partial plan view of the device shown in Fig. 1. 4 are enlarged cross-sectional views of a part of FIG. 2. 1... Gap, 2... Magnetic head, 2a...
Gap surface, 3... Head mounting plate, 4... Magnetic tape, 8... Head support board, 12... First screw, 13... Second screw, 14... Third screw,
15...First gear, 16...Second gear, 17
...Third gear, 18...Engagement gear.

Claims (1)

[Claims for Utility Model Registration] A magnetic head for recording or reproducing by contacting a magnetic tape, and a head mounting to which the magnetic head is fixed and arranged perpendicular to the gap plane of the magnetic head. a head support substrate disposed substantially parallel to the head mounting plate and formed so as to be able to adjust the angle of the magnetic head with respect to the running direction of the magnetic tape; and a tape of the magnetic head. an adjusting mechanism for displacing the head support substrate so as to adjust the angle with respect to the tape running direction; and adjusting the height position of the gap of the magnetic head without changing the angle of the magnetic head with respect to the tape running direction; first and second screws that penetrate the head support substrate and are screwed into the head mounting plate and are set so that the distances from the gap surface of the magnetic head are equal to each other; and the main surface of the magnetic tape. In order to adjust the angle of the magnetic head relative to the magnetic head, the magnetic head is disposed at a position where the distance from the gap surface is larger than that of the first and second screws, and is screwed into the head mounting plate through the head support substrate. a third screw that is connected to the screw; first, second, and third gears provided on the first, second, and third screws, and positions where the gears mesh with the first and second gears, respectively; and an engagement gear movably disposed so as to be able to selectively take positions meshing with the first, second, and third gears, respectively, and 1. The second and third screws are formed with the same pitch and the same diameter, and the distance from the gap surface of the magnetic head to the center line of the first and second screws is L 1 , and the distance from the gap surface to L ₁ is L 1 . The distance to the center line of the third screw is
L ₂ , the number of teeth of the first and second gears, respectively
When Z ₁ and the number of teeth of the third gear are Z ₂ ,
A magnetic head adjusting device, wherein the first, second, and third gears are configured so that the relationship L ₁ /L ₂ =Z ₂ /Z ₁ is established.