JP2608907B2 - Rotary tape guide mechanism for magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a magnetic recording / reproducing apparatus suitable for reducing the size and weight of the magnetic recording / reproducing apparatus and increasing the precision. The present invention relates to a rotary tape guide mechanism.

[Prior Art] Conventionally, various inventions have been proposed for a magnetic recording / reproducing apparatus in order to reduce the size and weight of the apparatus and to increase the precision thereof for the purpose of use.

For example, a rotary tape guide mechanism to which the present invention is applied, that is, a rotary tape guide mechanism used for forming a tape running path, is also described in, for example, Japanese Utility Model Publication No.
Japanese Unexamined Utility Model Publication No. 58-16304 discloses a technique disclosed in Japanese Patent Application Laid-Open No. 55-16330 and a technique related thereto.

These prior arts can be summarized as follows. As shown in FIG.
02a and 102b, and tape guide means 10 is attached to one shaft 102a.
3 and the driving means 104 is inserted into the other shaft 102b, and the tape guide means 103 and the driving means 104 are respectively prevented from slipping out from the front ends of the two shafts 102a and 102b. A stop ring 105 and the like are installed on the vehicle.

[Problems to be Solved by the Invention] In the above-mentioned prior art, sufficient consideration has not been given to the point that the above-mentioned magnetic recording / reproducing apparatus is made smaller and lighter to achieve higher precision, and the following problems arise. Was.

That is, as shown in FIG. 20, when the tape guide means 103 and the drive means 104 are inserted into different shafts 102a and 102b, respectively, the tape guide means 103 and the drive means 104
Since the length of the mounting position increases by the center distance S between the two shafts 102a and 102b, there is a problem that the entire length L increases.

Therefore, if it is assumed that the size and weight of the related art are reduced, the following problems are expected to occur.

(1) First, the tape guide means 103 and the driving means 1
Consider rotation accuracy with 04.

When the two shafts 102a, 102b are rotatably and loosely supported on the chassis 101, respectively, as in the prior art, the two shafts 102a, 102b are
The rotation accuracy of the tape guide means 103 and the drive means 104 depends on the planting accuracy of the 102b, the amount of elastic deformation at the time of rotation, and the diametrical and axial gaps of the rotation bearing sliding portion of the tape guide means 103 and the drive means 104. Is affected. In particular, in order to maintain high precision with regard to the gap, when the diameter of the shafts 102a and 102b and the dimension in the axial direction become smaller, it is necessary to make it smaller accordingly, and the influence of the gap becomes significantly worse. Become.

However, in order to reduce the size and weight, the chassis 10
It is necessary to reduce the thickness of 1
2b, the shaft 102
a, 102b can not be so large in diameter,
Inevitably, the diameter of the shafts 102a, 102a must be reduced. When the diameter of the shafts 102a and 102b is reduced, the implantation accuracy of the chassis 101 is deteriorated, and naturally, the amount of elastic deformation at the time of rotation of the shafts 102a and 102b is increased. The effect of is getting worse. That is, in the prior art, if the size and weight are simply reduced, the rotation accuracy is significantly deteriorated.

(2) Next, the point of achieving higher precision than the current state while simultaneously reducing the size and weight will be examined.

In order to achieve higher precision than the current situation, the shafts 102a, 1
The implantation accuracy of 02b is required to further improve the accuracy to compensate for the decrease in accuracy due to the reduced diameter of the shafts 102a and 102b, and it is necessary to further reduce the radial and axial clearances of the bearing portion. Required.

When this happens, productivity problems arise. That is, in order to set up a thin shaft with extremely high precision, a special jig or the like is required to cope with it, and accordingly, a large amount of equipment and processing costs are required.

(3) On the other hand, the rotary type tape guide mechanism is required to be mass-produced from its use, and is required to be improved in assemblability such as in particular requiring automation of assembling.

However, when the shafts 102a and 102b are thinner and the gap between the bearing portions is significantly reduced, the assemblability must be reduced.In particular, reducing the axial gap significantly impairs the assemblability. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary tape guide mechanism for a magnetic recording / reproducing apparatus which solves the above-mentioned problems of the prior art and enables a reduction in size and weight and an increase in accuracy without reducing productivity. It is in.

Means for Solving the Problems In order to achieve the above object, according to the present invention, a bearing fixed to a chassis of a magnetic recording / reproducing apparatus, a shaft rotatably supported by the bearing, and a rotating shaft are provided. A boss portion is formed at the moving center portion, and a first turning means fitted on the shaft and a boss portion is formed at the turning center portion so that the boss portion of the first turning means can rotate. A second rotating means fitted therein,
An inner peripheral surface of the bearing that supports the shaft or an outer peripheral surface of the shaft,
The outer peripheral surface of the boss portion of the first rotating means or the second
An annular groove is formed in the inner peripheral surface of the boss portion of the rotating means, and the inner peripheral surface or the outer peripheral surface of the shaft supporting the shaft, and the outer peripheral surface of the boss portion of the first rotating means or A part of the inner peripheral surface of the boss portion of the second rotating means is cut and raised in the circumferential direction to form a flexible convex portion to be inserted into the groove.

[Operation] The present invention provides a boss formed on a plurality of rotating means, for example, a rotating tape guide means and a driving center thereof, which are rotatably fitted on the same axis. Are rotatably fitted around each other about the axis,
In addition, since the shaft is rotatably fitted into a bearing fixed to a lower space position of the magnetic recording / reproducing apparatus, the whole can be reduced in weight and size.

Further, an engaging portion having a groove and a flexible convex portion to be inserted into the groove is provided between the two bosses and between the shaft and the bearing. Because it is engaged and supported between the bearings, it can be formed to the diameter of the shaft necessary to maintain the rotation accuracy, even if it is small and lightweight,
In addition, the diameter of the shaft can be further increased, thereby solving the problems of planting accuracy and deformation of the shaft caused by the reduced diameter of the shaft, and reducing the influence of the radial gap of the bearing. In addition, the shaft, the rotary tape guide means and the driving means are engaged and supported by the engaging portion formed on the outer periphery of the shaft or the boss portion so as to be in close contact with each other in the axial direction. Therefore, the problem of the axial gap can be easily solved, so that sufficient rotational accuracy can be maintained even if the size and weight are reduced.

When productivity is taken into consideration, the diameter of the shaft is increased, so that it is possible to prevent an increase in machining equipment costs and machining costs due to the increase in the accuracy of the shaft planting, and to reduce the possibility of assembling the shaft. Deterioration due to a decrease in diameter can be prevented. Also, after the tape guide means and the drive means have been assembled in advance, they can be assembled to the bearing part attached to the chassis, so that any of the parts can be moved downward and the assembled parts can be assembled. Later, it can be held by the bearing part with the engaging part,
Jigs and tools for holding can be eliminated.

Therefore, high productivity can be achieved while reducing the size and weight and increasing the precision.

Embodiments Hereinafter, FIGS. 1 to 21 showing a rotary tape guide mechanism of a magnetic recording / reproducing apparatus according to an embodiment of the present invention will be described.

First, an outline of a magnetic recording / reproducing apparatus to which the present invention is applied will be described with reference to a plan view shown in FIG.

As shown in FIG. 21, a magnetic drum 2 having a plurality of magnetic heads (not shown) is positioned and fixed to a chassis 1. The guide roller 3, capstan motor 4, and reel motor 5 are also fixed to the chassis 1. The magnetic tape (not shown) is wound around the guide roller 6, the magnetic drum 2 and the guide roller 3, is driven by the capstan 7 and the pinch roller 8, is wound around the exit guide roller 9, and is driven by the reel motor 5. The reel unit 10 is wound up. (The tape guide member (referred to as a loading mechanism) for pulling out the tape from the cassette and wound around the magnetic drum 2 and the cassette are not shown.) Next, the operation of the portion related to the tape guide mechanism of the present invention will be described with reference to FIG. explain.

As shown in FIG. 21, the mode motor 11 is fixed to the motor holder 12, and when a predetermined voltage is applied, the mode motor 11
And a transmission shaft 16 into which the gear 15 is press-fitted and fixed, and a gear 17 meshing with the gear 15, the transmission force is amplified to a predetermined value by the worm 18 and the worm wheel 19. . The amplified transmission force is transmitted to the gears 20 and 21 and transmitted to the mode cam 22 having a single cam groove 23 having a plurality of radii of curvature. This cam groove
A cam detection pin 25 implanted on the slider 24 is engaged with the slider 23, and the slider 24 corresponds to the radius of curvature of the cam groove 23.
The slider 24 reciprocates, and the reciprocating motion of the slider 24 swings the rotary cam 27 through the pin 25 at the lower right end thereof and the groove 26 that slides the pin 25, and at the same time, presses the lever through the pin 25.
Rotate 28. This crimping lever 28 has a tip projection 29
When the pressure plate 31 according to the present invention is rotated through the groove 30 that slides on the protrusion 29, the spring (not shown) interposed between the pressure plate 31 and the pinch roller arm 32 is rotated. The pinch roller arm 32 is rotated by the elastic force, and the pinch roller 8 at the upper end thereof is pressed against or separated from the capstan 7, and at the same time, the guide roller 33 on the upper end of the pinch roller 8 moves to move the tape along the path. To change.

Next, the rotary tape guide mechanism according to the present invention will be described in more detail with reference to FIGS.

As shown in FIG. 1, the pinch roller arm 32 has a boss portion 34 rotatably fitted on a shaft 35, and the shaft 35 rotates on a bearing portion 36 fixed to a lower gap portion of the chassis 1. It is freely inserted. Further, the boss portion 34 is rotatably fitted on the inner peripheral surface of the boss portion 37 of the crimping plate 31 on its outer peripheral surface so as to be concentric with the shaft 35, and forms a ring-shaped groove 38. I have. As shown in FIG. 2, the ring-shaped groove 38 is formed by two grooves formed at positions facing the inner peripheral surface of the boss portion 37 of the pressure bonding plate 31.
An axial movement is fixed by fitting two flexible projections 40 to be inserted into the respective grooves 39 so that the positions in the axial direction coincide with the positions of the grooves 39. The shaft 35 has a ring-shaped groove 41 formed on the outer peripheral surface of a lower portion thereof. This ring-shaped groove 41
3, two grooves 42 formed at positions opposed to the inner peripheral surface of the bearing portion 36 are arranged so that their positions in the axial direction coincide with each other. The protrusion 43 is inserted and fixed in the axial direction. That is, the shaft 35 and the bearing
36 and the boss portions 34 and 37 have a relationship in which the directions of rotation are free and only the movement in the axial direction is fixed.

Each of the convex portions 40 and 43 has a width and a thickness or a diameter which gradually decrease as the enlarged view goes to the front end as shown in FIG. It is formed so that
The bottoms of the pinch roller arm 32 in the groove 38 and the shaft 35 in the groove 41 are formed so as to lightly contact with each other or to be located at positions slightly apart from each other.

As shown in FIG. 5, each of the convex portions 40 and 43 has a pinch roller arm 32 or
35, the pinch roller arm 32 or the shaft 35 with respect to the crimping plate 31 or the bearing 36, as shown in FIG. It may be formed so as to be eccentric from the center in the respective relative rotation directions, or as shown in FIG.
It is also conceivable to fix them directly into the respective grooves 38, 41 by bonding or crimping. Further, each of the convex portions 40 and 43 is
As shown in FIGS. 8 (a) and 8 (b), the crimping plate 31 and the bearing portion 36 are formed as one body, or as shown in FIG. It is also conceivable to separate the portions 31a and 31b by elastic deformation. 2 and 3, the projections 40, 4
It is also conceivable to install 3 on the shaft 35 and the pinch roller arm 32 side as shown in FIG. 10 and FIG.

Next, a rotary tape guide mechanism according to another embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 12, the bearing portion 36 has a cylindrical portion 45 integrally formed on the upper surface of the flange portion 44 to be inserted into the boss portion 34 of the pinch roller arm 32. A ring-shaped groove 46 is formed on the outer peripheral surface of the cylindrical portion 45. The boss portion 34 of the pinch roller arm 32 has the groove 46 and the crimping plate 31
A hole 47 penetrating in the radial direction is formed so as to be simultaneously connected to a ring-shaped groove 48 formed on the inner peripheral surface of the boss portion 37, and fitted into the two grooves 46 and 48 respectively in the hole 47. A connecting body 49 in which flexible convex portions 40 and 43 are integrally formed at both ends is fitted and inserted. The connecting body 49 has convex portions 40, 4 at both ends.
It is made of the same material as 3 or another material.

In this case, as shown in FIG. 14, which is another embodiment of the above-mentioned FIG. 13, a connecting body 49 having projections 40, 43 integrally formed at both ends thereof is pinch roller arm with respect to the bearing 36.
The boss portion 34 of the 32 and the boss portion 37 of the pressure-bonding plate 31 are arranged to be inclined in the direction of rotation indicated by the arrow, or as shown in FIGS. 15 (a) and 15 (b) of another embodiment. Alternatively, it is also conceivable to form a connecting body 49 integrally formed with the projections 40 and 43 at both ends with the boss 34 of the pinch roller arm 32.

Next, FIGS. 16 and 17 showing a rotary tape guide mechanism according to still another embodiment of the present invention will be described.

As shown in FIGS. 16 and 17, the boss 37 of the pinch roller arm 32 is formed with a hole 50 penetrating in the radial direction so as to be in contact with the upper surface of the flange 44 of the bearing 36. The hole 50 has a rectangular cross section so as to open to the upper surface side of the flange portion 44, and a connecting body 49 is inserted into the hole 50 so as to be fixed to the upper surface thereof by bonding or the like. .

In this case, as shown in FIGS. 18 (a) and 18 (b), which are other embodiments of FIGS. 16 and 17, the flexible projections 40 and 43 and the connecting body 49 are pinched by a pinch roller. It is also conceivable to form it integrally with the arm 32.

Next, a rotary tape guide mechanism according to still another embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 19, the present embodiment differs from the embodiment shown in FIG.
Are placed upside down, in this case, the crimping plate
31 is rotatably fitted to the shaft 35 on the inner peripheral surface of the boss 37, and the inner peripheral surface of the boss 34 of the pinch roller arm 32 is rotatably concentrically mounted on the shaft 35 on the outer peripheral surface of the boss 37. It is inserted.

Further, a ring-shaped groove 51 is formed on the outer peripheral surface of the boss 37 of the pressure bonding plate 31, and the boss 34 of the pinch roller arm 32 is formed in the groove 51.
A flexible convex portion 40 fitted on the inner peripheral surface is fitted.

Further, a ring-shaped groove 52 is formed in a lower portion of the shaft 35, and a flexible convex portion inserted into the groove 52 on the inner peripheral surface of the bearing portion 36 is formed.
43 is inserted.

Therefore, the rotary tape guide mechanism according to the present invention can reduce the length and height dimensions as compared with the conventional one, and can reduce the size of the magnetic recording / reproducing apparatus even if the magnetic recording / reproducing apparatus is downsized. In addition, it is possible to prevent the rotation accuracy from being lowered due to the elastic deformation of the shaft, the clearance in the diametrical direction and the axial direction of the sliding surface of the bearing portion. It is possible to prevent a reduction in planting workability and an assemblability of the entire tape guide mechanism, that is, a reduction in productivity.

[Effects of the Invention] According to the present invention, it is possible to reduce the size and weight, improve the accuracy, and improve the productivity.

[Brief description of the drawings]

1 is a sectional front view showing a rotary tape guide mechanism according to one embodiment of the present invention, FIG. 2 is a sectional plan view taken along the line AA 'of FIG. 1, and FIG. 3 is B of FIG. FIG. 4 is an enlarged sectional view showing a groove and a flexible convex portion, and FIGS.
11 is an enlarged sectional view showing another embodiment of FIG. 4, FIG. 12 is a sectional front view showing a rotary tape guide mechanism according to another embodiment of the present invention, and FIG. FIGS. 14 and 15 (a) and (b) are enlarged views showing the integral connection part of FIG.
FIG. 16 is an enlarged sectional view showing another embodiment of the drawing, FIG. 16 is a sectional front view showing a rotary tape guide mechanism according to still another embodiment of the present invention, and FIG. 17 is an integral connection shown in FIG. 18 (a) and (b) are enlarged sectional views showing another embodiment of FIG. 17, and FIG. 19 is a rotary type which is another embodiment of the present invention. Sectional front view showing the tape guide mechanism, FIG.
FIG. 20 is a sectional front view showing a conventional rotary tape guide mechanism, and FIG. 21 is a plan view showing a magnetic recording / reproducing apparatus to which the present invention is applied. 1 ... chassis, 8 ... pinch roller, 31 ... crimping plate,
32 ... Pinch roller arm, 34,37 ... Boss part, 35 ...
Shaft, 36 bearing part, 38, 39, 41, 42 groove, 40, 43 movable protrusion.

Claims (1)

(57) [Claims] 1. A bearing fixed to a chassis of a magnetic recording / reproducing apparatus, a shaft rotatably supported by the bearing, and a boss formed at a center of rotation, and fitted into the shaft. First
And a second rotator having a boss formed at the center of rotation and rotatably inserted into the boss of the first rotator to support the shaft. An annular groove is formed on the inner peripheral surface of the bearing or the outer peripheral surface of the shaft and the outer peripheral surface of the boss of the first rotating means or the inner peripheral surface of the boss of the second rotating means; The inner peripheral surface of the bearing or the outer peripheral surface of the shaft for supporting the shaft and a part of the outer peripheral surface of the boss portion of the first rotating means or a part of the inner peripheral surface of the boss portion of the second rotating means are formed around the circumference. A flexible tape guide mechanism for a magnetic recording / reproducing apparatus, wherein the flexible tape guide section is cut and raised in a direction and is fitted in the groove.