JPH0660596A - Tape cartridge - Google Patents

Abstract

PURPOSE:To prevent the swivelling rotative movement of a tape reel even when an inclination is generated on the axial center of the tape reel against the axial center of a fulcrum. CONSTITUTION:A spherical member 22 is provided between the upper flange 44 and upper cover 3 of a tape reel 4. Then, even when the axial center P2 of the tape reel 4 is inclined with respect to the axial center P1 of a fulcrum 10, the tape reel 4 is stabilized around the axial center P2 and a completely round rotative movement is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge most suitable for application to a data cartridge for high-density recording (back memory) of CPU data, and more particularly to a tape reel support structure.

[0002]

2. Description of the Related Art Conventionally, as a data cartridge for high density recording (back memory) of CPU data, for example, Japanese Patent Publication No. 52-14976 has been known.

A conventional data cartridge of this type is shown in FIG.
As shown in FIG. 4, the cartridge 1 is screwed onto the upper half-thin box-shaped upper cover 3 formed of a translucent synthetic resin on a metal base plate 2 such as an aluminum plate which is the lower half. It is formed by stopping. A pair of left and right tape reels 4 formed of synthetic resin are rotatably supported on the base plate 2.
A magnetic tape 5 which is a tape is provided on both of these tape reels 4.
Is wound. This magnetic tape 5 is guided by three flanged tape guides 6 attached to the base plate 2 and is hung along the inside of the front wall 3 a of the upper cover 3. A drive roller 7 and a pair of left and right corner rollers 8 made of synthetic resin are rotatably supported at substantially the center of the front edge of the base plate 2 and the left and right corners of the rear edge. An elastic drive belt 9 formed of a rubber belt or the like is wound between the drive roller 7 and both corner rollers 8 in a substantially T shape with a strong tension. A pair of left and right drive portions 9a between the drive roller 7 of the drive belt 9 and both corner rollers 8 are provided on the outer circumference of the pair of left and right tape winding portions 5a of the magnetic tape 5 wound around the tape reels 4. Being pressed against.

Both the tape reels 4 and the three rollers 7 and 8 are inserted into the outer periphery of a total of five metal supporting shafts 10 vertically planted by press fitting on the base plate 2 by these center holes 11 to rotate. It is freely pivoted, and inside the running path of the magnetic tape 5, a tape end optical detection mirror 1 is provided.
2 is attached.

Next, when this data cartridge is mounted on the recording / reproducing apparatus, the notch 1 formed on one side of the drive roller 7 on the front edge side of the base plate 2 and the upper cover 3.
An opening / closing door 14 mounted between the base plate 2 and the upper cover 3 so as to open and close the opening 3 is opened in the direction of the arrow a as indicated by the alternate long and short dash line, and the magnetic head 15 on the recording / reproducing apparatus side is provided with the cutout 13. It is inserted in the direction of the arrow b and contacts the magnetic tape 5. At the same time, a motor roller 16 such as a rubber roller, which is rotatably driven by a motor (not shown) on the recording / reproducing apparatus side, is inserted into an opening 17 formed in the front wall 3a of the upper cover 3 in front of the drive roller 7 by an arrow. The motor roller 16 is inserted from the direction c and is pressure-bonded to the outer periphery of the large-diameter roller portion 7b integrally formed on the belt winding surface 7a of the drive roller 7. Then, when the drive roller 7 is rotationally driven in the direction of arrow d by the motor roller 16 and the drive belt 9 is rotationally driven in the direction of arrow e, both drive portions 9a pass through both tape winding portions 5a. The tape reel 4 is rotationally driven in the direction of arrow e, and the magnetic tape 5
Runs in the direction of arrow f at a high speed of 25 to 120 inch / sec, and the magnetic head 15 causes the magnetic tape 5 to CPU.
Data is recorded and reproduced.

Conventionally, as shown in FIGS. 4 and 5, the tape reel 4 is assembled by a lower component member 4a and an upper component member 4b which are molded from a synthetic resin such as ABS resin. The lower component 4a includes a hub 42 having an inner cylinder 40 and an outer cylinder 41, and a lower franchise 43.
The upper component 4b is composed of an upper flange 44 and a plurality of notches 4 at the center of the upper flange 44.
5 and an elastic acting portion 46 formed by a thin structure,
A center pin 47 formed at the upper center of the elastic action portion 46 and a plurality of mounting pins 48 formed at the lower portion of the lower flange 43. Then, the plurality of mounting pins 48 of the upper flange 44 are inserted and fixed in the plurality of mounting holes 49 formed in the hub 42 so that the lower component member 4a and the upper component member 4b are integrally assembled.

Then, as shown in FIG. 5, the tape reel 4 is supported by the center hole 11 of the inner cylinder 40 of the hub 42 so as to support the spindle 10.
Inserted into the outer periphery of the base plate 2 so as to be rotatably supported on the base plate 2, and the center pin 47 is loosely fitted in the circular recess 21 formed on the lower surface 3b of the upper cover 3, and the center pin 4 is moved by the upper cover 3.
7 is pressed against the elasticity of the elastic action portion 46 from the direction of the arrow g, and the lower end 40a of the inner cylinder 40 of the hub 42 is pressed onto the base plate 2 by the elastic repulsive force.

Thus, the vertical movement of the tape reel 4 in the cartridge 1 is suppressed so that the magnetic tape 5 can be neatly wound around the outer circumference of the outer cylinder 41 of the hub 41.

[0009]

However, the conventional method shown in FIG.
As shown in FIG.
When an inclination θ occurs in the axis P ₂ of the tape reel 4 with respect to the axis P ₁ of the support shaft 10 due to the clearance between the center axis P _{1 and} the axis P ₁ of the spindle 10 as shown by the alternate long and short dash line in FIG. Pin 4
7, it becomes impossible to contact the recess 21 at the apex 47a of the axis P _2, as indicated by a solid line in FIG. 7 (A), the center pin 47 only E content relative to the axis P ₂ The eccentric point 47b, which is slightly deviated, makes an oblique contact with the recess 21.

Then, as shown in FIG. 7B, when the center pin 47 is rotated integrally with the tape reel 4 in the direction of arrow e, the center pin 47 rolls in the recess 21 in the direction of arrow h. As shown in FIG. 6, the entire tape reel causes a swinging rotational movement in the direction of arrow h around the axis P ₁ .

As a result, there is a problem in that the tape path of the magnetic tape 5 moves up and down in the direction of arrow i, increasing the off-track amount of the magnetic head 15.

The present invention has been made to solve the above problems, and the tape reel swings and rotates even if the axis of the tape reel is tilted with respect to the axis of the spindle. It is an object of the present invention to provide a tape cartridge that does not cause

[0013]

SUMMARY OF THE INVENTION To achieve the above object, a tape cartridge according to the present invention has a hub of a tape reel rotatably supported on the outer periphery of a support shaft erected on a base plate of the cartridge. In a tape cartridge configured such that the center of the upper flange of the tape reel is pressed from above by the upper cover of the cartridge, a spherical member is interposed between the upper flange of the tape reel and the upper cover. is there. At this time, it is preferable that the elastic acting portion is integrally formed in the center of the upper flange, the spherical member is formed of an elastic member, or the spherical member is loosely fitted in the recess formed in the lower surface of the upper cover. .

[0014]

In the tape cartridge of the present invention constructed as described above, since the spherical member is interposed between the upper flange of the tape reel and the upper cover, the axis of the tape reel is different from the axis of the spindle. Even if the tape is tilted, the spherical member can always make point contact with the upper cover at the apex, so that the tape reel can perform a perfect circular rotation motion around its axis, and the tape reel swings. No rotational movement occurs.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a data cartridge to which the present invention is applied will be described below with reference to FIGS. In addition,
The same structural parts as those in FIGS. 3 to 7 are designated by the same reference numerals to omit redundant description.

In the data cartridge of the present invention, as shown in FIG. 2, the center pin 47 of the upper flange 44 of the tape reel 4 is removed and the elastic action portion 46 of the upper flange 44 is removed.
Of the upper surface 44a of the spindle 10 is formed as a smooth surface between the elastically acting portion 46 of the upper flange 44 of the tape reel 4 and the upper cover 3 on the axis P ₁ of the support shaft 10 such as a synthetic resin or metal. The spherical member 22 formed by is interposed.

The spherical member 22 is the lower surface 3 of the upper cover 3.
It is loosely fitted in the circular recess 21 formed in b. Then, the spherical member 22 is pressed against the elasticity of the elastic action portion 46 by the upper cover 3 by the pressing force in the direction of the arrow g when the upper cover 3 is screwed onto the base plate 2 from above, and the elasticity is generated. The lower end 40a of the inner cylinder 40 of the hub 42 is pressed against the base plate 2 by the repulsive force.

Therefore, as shown in FIG. 1, due to the clearance between the center hole 11 of the tape reel 4 and the support shaft 10,
The axis P _{2 of the} tape reel 4 with respect to the axis P ₁ of the support shaft 10
Even if the inclination θ is generated, the spherical member 22 is displaced from the axial center P ₂ of the tape reel 4 and the apex 22a and the bottom point 22b of the spherical member 22 are moved to the recess 21 of the upper cover 3 and the elasticity of the tape reel 4. It is possible to make point contact with the action portion 46.

As a result, when the tape reel 4 is rotated around the inclined axis P _{2 in} the direction of the arrow e, the spherical member 2
No swinging motion occurs at 2 and the tape reel 4
Can perform a perfect circular rotation motion around its axis P ₂ , and the tape reel 4 does not swing.

Since the tape reel 4 can make a perfect circular rotation motion about the axis P ₂ , the magnetic tape 5
The vertical movement of the tape path can be suppressed, and the off-track amount of the magnetic head 15 can be reduced.

Since the elastic action portion 46 is integrally formed on the upper flange 44 of the tape reel 4, the spherical member 22 is formed.
Can be formed of a wear resistant member such as synthetic resin or metal, and durability can be improved.

On the other hand, in the data cartridge of the present invention,
The spherical member 22 can be formed of an elastic member such as rubber. If the spherical member 22 is formed of an elastic member such as rubber, the elastic action portion 46 of the tape reel 4 can be eliminated, so that the structure of the upper flange of the tape reel 4 is simplified and its molding is facilitated. be able to.

The spherical member 22 is attached to the lower surface 3 of the upper cover 3.
If the tape reel 4 and the spherical member 22 are easily assembled into the recess 21 formed in b, the tape reel 4 and the spherical member 22 can be easily assembled.

The above is a description of one embodiment of the present invention.
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. Further, the present invention is not limited to the data cartridge and can be applied to various tape cartridges.

[0025]

The tape cartridge of the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, the spherical member is interposed between the upper flange and the upper cover of the tape reel so that the spherical member is always apex even if the axis of the tape reel is inclined with respect to the axis of the support shaft. Since it is possible to make point contact with the upper cover with, so that the swinging rotation motion does not occur on the tape reel, it suppresses the vertical movement of the tape path of the magnetic tape,
The off-track amount of the magnetic head can be reduced,
High-precision recording and playback can be performed.

According to the present invention, since the elastic acting portion is integrally formed at the center of the upper flange of the tape reel, the spherical member can be formed of a wear resistant member such as synthetic resin or metal.
The durability can be improved.

Since the spherical member is formed of an elastic member such as rubber, the elastic action portion of the tape reel can be eliminated, the structure of the upper flange of the tape reel can be simplified, and the molding can be facilitated. Can be

According to the present invention, since the spherical member is loosely fitted in the recess formed in the lower surface of the upper cover, the tape reel and the spherical member can be easily assembled in the cartridge.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view illustrating tilt rotation of a tape reel of a data cartridge that is an embodiment of the present invention.

FIG. 2 is a sectional side view illustrating a support structure of a tape reel.

FIG. 3 is a partially cutaway plan view of the data cartridge.

FIG. 4 is an exploded perspective view of a data cartridge.

FIG. 5 is a cross-sectional side view illustrating a conventional tape reel support structure.

FIG. 6 is a cross-sectional side view for explaining a swing motion of a conventional tape reel.

7A and 7B are a cross-sectional side view and a schematic plan view of a main part for explaining the cause of the swinging rotational movement of the conventional tape reel.

[Explanation of symbols]

1 cartridge 2 base plate 3 upper cover 3b lower surface of upper cover 4 tape reel 44 upper flange of tape reel 46 elastic part of tape reel 5 magnetic tape 10 spindle 11 center hole 21 recess 22 spherical member P ₁ spindle axis P ₂ tape reel axis

Claims (4)

[Claims] 1. A hub of a tape reel is rotatably supported on the outer periphery of a support shaft erected on a base plate of a cartridge, and the center of the upper flange of the tape reel is pressed from above by the upper cover of the cartridge. In the tape cartridge configured as described above, a spherical member is interposed between the upper flange of the tape reel and the upper cover. 2. The tape cartridge according to claim 1, wherein an elastic action portion is integrally formed in the center of the upper flange. 3. The tape cartridge according to claim 1, wherein the spherical member is formed of an elastic member. 4. The tape cartridge according to claim 1, wherein the spherical member is loosely fitted in a recess formed in the lower surface of the upper cover.