JP2570516B2 - Reel disc for recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel disk for a recording / reproducing apparatus used for a magnetic recording / reproducing apparatus such as a VTR and a DAT.

[0002]

2. Description of the Related Art As a reel disk used in a magnetic recording / reproducing apparatus such as a VTR and a DAT, a conventional reel disk shown in FIGS.
Has been proposed. FIG.
FIG. 5 is an enlarged view of a state where the magnetic tape winding body 2, the reel hub 3 and the reel disk 4 in the magnetic tape cassette 1 are connected, and FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 in a state where the sliding sheet 5 is attached to the fins 1a and 1b.

The magnetic tape cassette 1 has the same construction as a normal video cassette (not shown). The magnetic tape is wound around a supply reel (reel hub) and supplied to the supply tape. A magnetic tape is guided by a tape guide and travels in the vicinity of a rotary lid and a loading means insertion hole on the front surface of the cassette to form a winding reel (reel). (The hub) to form a winding side tape winding body.

[0005] As clearly shown in FIG.
In a state where the magnetic tape 6 is wound around the outer peripheral surface 3a to form the tape wound body 2, a sliding sheet provided on the upper and lower cassette halves 1a and 1b of the magnetic tape cassette 1 is provided. 5 and is positioned in the upper and lower cassette halves 1a and 1b in the height direction by the elastic force of the sliding sheet 5. The horizontal positioning is performed by a method not shown.

[0005] The magnetic tape cassette 1 having such a configuration is used for
When the magnetic tape cassette 1 is inserted into a magnetic recording / reproducing apparatus such as a TR, the rotating tape is opened by the movement of the magnetic tape cassette 1 to the operating position, and the loading means is inserted into the loading means insertion hole. The reel disk 4 on the supply side and the winding side is on the supply side,
It is inserted into the reel disc insertion hole of the reel hub 3 on the winding side. A well-known radially formed engaging groove 3c is formed in the inner peripheral surface 3b of the reel hub 3 serving as a reel disk insertion hole, and is provided below the outer peripheral surface 4a of the reel disk 4. A coupling is formed that engages with the claw portion 4b, and the take-up force is transmitted. The rotation of the reel disk 4 is directed to the reel hub 3, and the rotation of the reel hub 3 is directed to the reel disk. 4 is transmitted.

Further, after the brake of the reel hub 3 on the supply side and the winding side is released, by moving the loading means,
The magnetic tape 6 is unreeled from the magnetic tape cassette 1, and
The recording / reproducing operation is performed while being attached to a guide drum having a built-in rotary head over a predetermined range.

[0007]

In the above-mentioned reel disk for a recording / reproducing apparatus, the mechanical accuracy of a magnetic recording / reproducing apparatus, such as the perpendicularity of a supply-side and take-up-side reel disk, and the magnetic tape cassette. This is not a problem when the magnetic tape is high, but there is a possibility that a recent magnetic recording / reproducing device, a magnetic tape cassette having a smaller size and lighter weight, a thinner magnetic tape, a higher density recording, etc. may cause a problem. .

FIG. 5 shows a reel disc 4 and a reel hub 3.
5 is a cross-sectional view taken along the line VV in FIG. 4 when the perpendicularity to the reference plane is high. For example, when the reel disk 4 has a perpendicularity to the reference plane and an inclination of θ as shown in FIG. When the reel disk 4 is inserted into the magnetic tape cassette 1, the abutment surface between the reel disk 4 and the reel hub 3 (the outer peripheral surface 4a of the reel disk 4 and the inner periphery of the reel hub 3). Since the diameter D1 of the surface 3b) is in surface contact with a length of L, the tape winding body 2 is also rotated with the inclination of θ in the state shown in FIG. I do.

For this reason, the magnetic tape cannot be absorbed by the elastic force of the sliding sheet 5 and causes uneven rotation. During a loading operation or the like, the magnetic tape contacts the upper and lower flanges of the tape guide of the magnetic recording / reproducing apparatus. Magnetic tape damage occurs due to contact, etc.
There is a possibility that the unevenness of the inclination θ of the hub causes problems such as the occurrence of a step in the wound magnetic tape and an increase in the tape running load.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a reel disk having a space between an outer peripheral surface of a reel disk and an inner peripheral surface of a reel disk insertion hole of the reel. While reducing the diameter of the outer peripheral surface of
A protrusion that protrudes outward on the outer peripheral surface of the reel disc ,
View the tape from the tape width direction of the tape cassette
At the center height of the tape drive, so that when the tape cassette is mounted on the recording / reproducing device, the protrusion and the inner peripheral surface of the reel disc insertion hole make point contact on the cross section in the reel axis direction. A reel disk was constructed.

[0011]

The reel disk for a recording / reproducing apparatus according to the present invention has a projection provided on the outer peripheral surface of the reel disk and an inner peripheral surface of the reel disk insertion hole when the magnetic tape cassette is mounted. And point contact on the cross section in the reel axis direction,
Without following the inclination of the reel disk and the reel hub, even if the reel disk and the reel hub are slightly inclined, the reel hub rotates in the reel axis direction and the tape is wound. The body and the reel can rotate parallel to the reference plane.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a reel disc for a recording / reproducing apparatus according to the present invention will be described with reference to the drawings. The reel disk for a magnetic recording / reproducing apparatus according to the present embodiment is roughly the same as the reel disk for a magnetic recording / reproducing apparatus shown in FIGS. 4 and 5 except for the gist of the present invention. Since they are the same, those having the same configuration, operation, and action are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is an enlarged view of the state of connection between a magnetic tape winding body 2 and a reel hub 3 in a magnetic tape cassette 1 similar to FIG. 4 and a reel disk 40 according to this embodiment. FIG. 2 is a sectional view taken along line II-II in FIG. 1 in a state where the sliding sheet 5 is attached to the upper and lower cassette halves 1a and 1b, and FIG. 3 explains the present invention. 3 is a sectional view similar to FIG. In this embodiment, since the reel hub and the reel disk on the supply side and the winding side have the same configuration, the reel hub 3 and the reel disk 4 are not distinguished from each other.
0 will be described. In the reel disc 40 of this embodiment, the diameter D3 of the outer peripheral surface 40a of the reel disk 40 is reduced, and the outer peripheral surface 40a of the reel disk 40 and the reel disk insertion hole for the reel are formed. An interval d is formed between the reel hub 3 and the inner peripheral surface 3b.
At 0a, a plurality of hemispherical projections 41 projecting outward at positions corresponding to the inner peripheral surface 3b are at the same height.
The tape winding body 2 is provided at a tape center height position as viewed from the tape width direction.

The diameter D of the outer peripheral surface 40a of the reel disk 40
3 is the diameter D1 of the abutment surface between the reel disk 4 and the reel hub 3 (the outer peripheral surface 4a of the reel disk 4 and the inner peripheral surface 3b of the reel hub 3) shown in FIG. Small and Lee
And the inner peripheral surface 3b of the reel hub 3.
The diameter D2 of the abutting surface is substantially the same as the diameter D1 in FIG.

As is clearly shown in FIG.
When the magnetic tape cassette 1 is inserted into the magnetic tape cassette 1, the projection 41 of the reel disk 40 and the inner peripheral surface 3b of the reel hub 3 abut at a point, and the reel hub 3 is positioned horizontally. Done. A claw 40b provided below the outer peripheral surface 40a of the reel disc 40 is engaged with an engaging groove 3c formed in the inner peripheral surface 3b of the reel hub 3, and the winding force is reduced. A transmission coupling is formed, and the rotation of the reel disk 40 is transmitted to the reel hub 3, and the rotation of the reel hub 3 is transmitted to the reel disk 40.

Further, after the magnetic tape cassette 1 is mounted on the apparatus and the brakes of the supply-side and take-up side reel hubs 3 are released, the magnetic tape 6 is moved by moving the loading means.
Is fed out of the magnetic tape cassette 1 and attached to a guide drum having a built-in rotary head over a predetermined range to perform a recording / reproducing operation.

When the reel disk rotates, whether the reel disk 40 has an inclination of .theta. As shown in FIG. 3 or the reel hub 3 is not vertical, Inner peripheral surface 3b of reel disc insertion hole and reel disc 40
A gap d is formed between the outer peripheral surface 40a of the reel disc 40 and the outer peripheral surface 40a of the reel disk 40. The peripheral surface 3b makes a point contact on a cross section in the reel axis direction.

Therefore, without following the inclination of the reel disc 40 and the inner peripheral surface 3b of the reel hub 3, the reel hub 3 rotates while rotating in the axial direction about the contact point, and −
The roll 2 and the reel hub 3 are guided by the sliding sheet 5, and can rotate in parallel with the upper and lower cassette halves 1a and 1b and the reference plane.

In the above embodiment, a plurality of hemispherical projections 41 are provided as the projections 41 of the reel disk 40. However, the present invention is not limited to the hemispherical projections. Any other protrusion having a point contact structure may be used.

Further , the projection 41 of the reel disk 40
Since the reel hub 2 is provided at the tape center height position as viewed from the tape width direction, the amount of rotation of the reel hub 3 in the reel axis direction can be increased, and the reel disk 4
0, the tolerance of the inclination of the reel hub 3 should be relatively large
Can be.

Furthermore, the reel disk for driving the magnetic tape cassette having the same construction as the supply reel and the winding reel incorporated therein has been described. However, only the supply reel is driven. It can also be used as a reel disk, or can be used for a cartridge with a single reel, a cassette, or the like.

[0022]

As described above, in the reel disk for a recording / reproducing apparatus according to the present invention, a space is formed between the outer peripheral surface of the reel disk and the inner peripheral surface of the reel disk insertion hole. A projection is provided on the outer peripheral surface of the reel disk so as to protrude outward, and the projection and the reel are in point contact with each other on a cross section in the reel axis direction. Even if the inner peripheral surface of the reel is slightly inclined,
The reel hub rotates without following the inclination of the inner peripheral surface of the reel hub, and the tape winding body and the reel can rotate in parallel to the reference plane. Without unevenness in the body, uneven rotation and tape running load can be reduced.
This has the effect of preventing the occurrence of magnetic tape damage.

Furthermore, projections so provided in the tape center height position as viewed from the tape width direction of the tape wound body can be a tape wound body, the amount of rotation of the reel axis of the reel and large.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing a connected state of a reel disk, a tape winding body, and a reel in one embodiment of a reel disk for a recording / reproducing apparatus according to the present invention.

FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 in a state where a sliding sheet is attached to a cassette housing.

FIG. 3 is a sectional view similar to FIG. 2 for explaining the present invention.

FIG. 4 shows a reel disc of a conventional recording / reproducing apparatus and a tape.
FIG. 4 is an enlarged view showing a state in which the tape cassette is connected to a tape winding body and a reel.

FIG. 5 shows a state in which a sliding sheet is attached to a cassette housing using a reel disk of a conventional recording / reproducing apparatus.
FIG. 5 is a sectional view taken along line VV in FIG. 4.

FIG. 6 is a cross-sectional view similar to FIG. 5 but showing a conventional recording / reproducing apparatus using a reel disk for explaining the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magnetic tape cassette 1a upper cassette half 1b lower cassette half 2 magnetic tape winding body 3 reel hub 3a outer peripheral surface of reel hub 3b inner peripheral surface of reel hub (reel disk insertion hole) 3c Reel hub engaging groove 4 Reel disk 4a Reel disk outer peripheral surface 4b Reel disk claw 5 Sliding sheet 40 Reel disk 40a Reel disk outer surface 40b Claw part of reel disk 41 Projection

Claims (2)

(57) [Claims] When a tape cassette containing a reel hub on which a tape-shaped recording medium is wound is mounted on a recording / reproducing apparatus, the tape cassette is connected to a reel disk insertion hole provided at the center of the reel hub to reduce the winding force. in the reel disc recording and reproducing apparatus for transmitting, that spacing is formed between the inner and outer circumferential surfaces of the reel disc of the reel disk insertion hole of Te Pukasetto, while the small diameter of the outer peripheral surface of the reel disc , A protrusion protruding outward on the outer peripheral surface of the reel disk, the width of the tape
The projection is provided at the center height position of the tape as viewed from the direction, and the projection and the inner peripheral surface of the reel disc insertion hole are point-contacted on the cross section in the reel axis direction when the tape cassette is mounted on the recording / reproducing apparatus. A reel disc for a recording / reproducing device, characterized in that: 2. The projection provided on the outer peripheral surface of the reel disk is a plurality of hemispherical projections provided at the same height.
2. The reel disc for a recording / reproducing apparatus according to claim 1, wherein: