JPS6331268Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette loaded in a magnetic recording/reproducing device or the like.

The structure of a conventional tape cassette will be explained with reference to FIGS. 1 to 4.

In the figure, a pair of reels 11 consisting of a reel hub 3 around which the magnetic tape 1 is wound, an upper flange 2 regulating the width direction of the magnetic tape 1, and a lower flange portion 3a integrated with the reel hub 3 are rotated. This is a tape cassette that is movably stored. In addition,
In the figure, only one reel 11 is shown. The convex portion 3d of the reel hub 3 is in contact with a reel spring 5 which is fixed to the tape cassette 4 and biases the tape cassette 4 in the thickness direction. On the inner periphery of the reel hub 3, there is a reel pawl 8 that rotates integrally with a reel stand 10 provided in the main unit of the magnetic recording and reproducing device.
A plurality of reel engaging claws 3b are provided in the radial direction of the reel 11 to engage with the claw portions 8a. At the lower end of the tape cassette 4 of the reel hub 3 in the thickness direction, there is formed a reel stand abutting part 3c which comes into contact with a reel stand 10 provided on the main unit. The diameter of the reel stand contact portion 3c is smaller than the diameter of the opening 4a provided in the lower portion 4' of the tape cassette 4.

The configuration of the reel stand for rotating the reel in order to load the tape cassette configured as described above into the main unit, transfer the magnetic tape, and perform recording or reproduction will be described with reference to FIG.

In the figure, reference numeral 10 denotes a reel stand that is rotatably fitted around a reel shaft 6 fixed to a substrate 12 of the main unit. A washer 13 is interposed between the reel stand 10 and the base plate 12 in the axial direction of the reel shaft 6. The upper part 10a of the reel stand 10 is the reel 11
This is the contact surface of the reel hub 3 with the reel stand contact portion 3c, and regulates the height and inclination of the reel 11 from the base plate 12. A reel pawl 8 having a plurality of pawls 8a that engages with the reel engaging pawl 3b of the reel hub 3 is fitted into a hexagonal column 10b at the axial center of the reel stand 10 via a reel pawl spring 9. A reel cap 7 is fixed to the upper end of the hexagonal column 10b. The reel pawl 8 is urged upward by a reel pawl spring 9 to be able to move up and down along the outer periphery of the hexagonal column 10b, and its position is regulated by coming into contact with the lower surface of the reel cap 7.

FIG. 3 shows a state in which the reel of the tape cassette is engaged with the reel stand configured as described above.
The reel base contact portion 3c of the reel hub 3 contacts the reel holding portion 10a, and the reel base 10 of the reel spring 5
The height position of the reel 11 is regulated by the biasing force in the direction. The outer periphery of the reel cap 7 is fitted into the inner diameter of the reel engaging pawl 3b of the reel hub 3, and the center of rotation of the reel 11 is positioned. The claw portion 8a of the reel claw 8 is engaged with the reel engaging claw 3b of the reel hub 3, and the rotational driving force of the reel stand 10 can be transmitted to the reel 11. The rotation of the reel stand 10 is achieved by a reel stand driving idler (not shown), which is a driving source, coming into contact with the outer periphery of the reel stand 10 as necessary.

FIG. 4 shows the operation of the tape cassette 4 during installation on the reel stand 10, and shows that the installation trajectory of the tape cassette 4 on the reel stand 10 is not perpendicular to the direction of the reel axis 6, but becomes an inclined trajectory. This is the case. As is clear from the figure, the reel engaging claw 3b
The inner diameter of the reel engaging pawl 3 is constant in the vertical direction.
Since the inner diameter part of the reel cap 7 is fitted with the outer circumference of the reel cap 7, the inner diameter part of the reel engaging pawl 3b comes into contact with the outer circumference of the reel cap 7 at an angle, and the reel cap 7 contacts the reel engaging pawl 3b. It is not inserted into the . Here, the mounting trajectory of the tape cassette 4 on the reel stand 10 is influenced by the movement trajectory of a cassette holder (not shown) that houses the tape cassette 4 and moves toward the main body of the apparatus. In order to accurately control the movement trajectory, the structure of the cassette holder becomes complicated. In addition, since the inner diameter of the reel engaging claw 3b is constant in the vertical direction, the reel cap 7 is vertically aligned with the inner diameter of the reel engaging claw 3b from the time when the reel 11 is inserted into the reel stand 10 until the insertion is completed. Since the reel is guided in the direction, the positional accuracy of the reel center of the tape cassette 4 and the reel axis 6 is maintained, and
It is necessary that the positional accuracy and insertion trajectory of the tape cassette 4 within the cassette holder be maintained with high precision. Even if the tape cassette 4 is inserted from an oblique direction with respect to the axial direction of the reel shaft 6, the reel 11 in the tape cassette 4 must be inserted into the tape cassette 4 in order for the reel engaging claw 3b and the reel cap 7 to be engaged. Although it is conceivable to provide sufficient movement margin in the thickness direction of the reel 11, maintaining the positional accuracy of the reel 11 within the tape cassette 4 requires the tape cassette 4 to have a complicated structure.

In view of the above-mentioned problems, the present invention has been developed to provide a tape that allows the tape cassette to be smoothly inserted into the reel stand without being affected by the posture of the tape cassette when it is inserted into the reel stand. It provides a cassette.

An embodiment of the tape cassette of the present invention will be described below.
This will be explained based on the diagram. Note that the same members as those in the conventional example described above are given the same numbers and their explanations will be omitted.

The tape cassette 4 rotatably houses a pair of reels 11 in which the magnetic tape 1 is wound around the outer periphery of a reel hub 23. The reel 11 consists of an upper flange 2 that regulates the width direction of the magnetic tape 1, and a lower flange portion 23a that is integrated with a reel hub 23. In addition, only one reel 11 is illustrated in the figure. The convex portion 23d of the reel hub 23 is in contact with the reel spring 5 which is fixed to the tape cassette 4 and biases the tape cassette 4 in the thickness direction. On the inner periphery of the reel hub 23, a plurality of reel drive engagement claws 23b are provided in the radial direction of the reel 11 to engage with the claw portions 8a of the reel claws 8 provided on the reel stand. The length of the reel drive engagement claw 23b in the width direction of the magnetic tape 1 does not reach the lower end of the reel hub 23. A reel engaging portion 23a is provided at the lower end of the reel hub 23 to fit into a reel positioning portion provided on the reel stand.

The configuration of the reel stand for rotating the reel in order to load the tape cassette configured as described above into the main unit, transfer the magnetic tape, and perform recording or reproduction will be described with reference to FIG. Note that the same members as those in the conventional example described above are given the same numbers and their explanations will be omitted.

In the figure, reference numeral 30 denotes a reel stand that is rotatably inserted around the reel shaft 6 fixed to the base plate 12 of the main unit. The reel holding part 30c forming the first step of the reel stand 30 is a contact surface with the reel stand contact part 23c of the reel hub 23 of the reel 11, and the reel holding part 30c forming the first step part of the reel stand 30 is a contact surface with the reel stand contact part 23c of the reel hub 23 of the reel 11, and the height and inclination of the reel 11 from the base plate 12 are controlled. is regulated. The protrusion outer diameter portion 30b forming the outer periphery of the reel positioning portion 30a forming the second step portion of the reel stand 30 is fitted with the inner periphery of the reel engaging portion 23a of the reel hub 23, and the rotation center of the reel 11 is fitted. Perform positioning. A reel claw spring 9 is connected to the shaft at the axial center of the reel stand 30.
A reel pawl 8 having a plurality of pawl portions 8a that engages with the reel engaging pawl 20b of the reel hub 23 is fitted. A reel cap 7 is fixed to the upper end of the shaft portion of the reel stand 30. The reel pawl 8 is urged upward by a reel pawl spring 9, and can move up and down along the outer periphery of the shaft portion of the reel stand 30, and its position is regulated by coming into contact with the lower surface of the reel cap 7. ing. Note that the outer circumferential diameter of the reel cap 7 is set to be sufficiently smaller than the inner diameter formed by the reel drive engaging pawl 23b.

The engagement operation of the reel 11 of the tape cassette 4 with the reel stand 30 constructed as described above will be explained with reference to FIG. First, the reel cap 7 enters into the opening formed by the reel engaging portion 23a, and then the reel cap 7 enters into the reel drive engaging pawl 23b. However, since the outer diameter of the reel cap 7 is sufficiently smaller in both cases, the entry progresses very smoothly, and even when the claw portion 8a of the reel claw 8 enters the reel drive engagement claw 23b, there is no dimensional relationship between them. Since there is sufficient room, insertion continues without any problem.
Finally, the protrusion outer diameter part 30b of the reel positioning part 30a of the reel stand 30 enters the opening formed by the reel engaging part 23a formed at the lower end of the reel hub 23, is fitted, and the center of rotation of the reel 11 is Positioning is performed. Here, the reel stand contact portion 23c
When the reel 1 comes into contact with the reel holding portion 30c of the reel stand 30, the reel 1 is moved by the biasing force of the reel spring 5.
1 is held in that position, and the mounting operation is completed.

Next, another embodiment of the tape cassette of the present invention will be described with reference to FIG.

In this embodiment, the reel positioning part 30a of the final reel stand 30 moves more smoothly into the reel engaging part 43a forming the opening of the reel hub 43.
A guide portion 43d having an inclined surface is provided at the opening. Reel positioning section 30a of reel stand 30
Before the reel engaging portion 43a of the reel hub 43 starts engaging, the reel cap 7 and the claw portion 8a of the reel claw 8 are both sized with sufficient margin relative to the reel hub 43, Speaking of,
The cassette reel 11 and the reel stand 30 are in a state where their mutual movements are not restricted. Next, when the reel positioning part 30a enters the reel engaging part 43a, the reel engaging part 43a forming the opening of the reel hub 43 is tilted in order to align the center of the cassette reel 11 with the center of the reel stand 30. Surface 43d
Even if the end of the reel positioning part 30a comes into contact with the reel positioning part 30a, it is guided by the inclined surface and positioned smoothly. In this embodiment, the final operation of fitting the reel positioning portion 30a and the reel engaging portion 43a is performed smoothly and without difficulty.

As is clear from the above description, the tape cassette according to the present invention has the following effects.

Since the reel cap and reel pawl are formed with sufficient dimensions for each configuration of the reel hub, the reel is not forced into the reel stand too much before the reel positioning part engages with the reel engaging part. Because you don't have to be guided,
Attaching the reel to the reel stand can proceed very smoothly.

When the reel is attached to the reel stand, it is not necessary to maintain accurate positioning of the reel with respect to the reel stand, so the positioning of the tape cassette within the cassette holder does not need to be accurate either.

Since the vertical locus of the cassette holder does not have to be close to parallel to the axial direction of the reel shaft, the degree of freedom in the vertical locus of the cassette holder is increased, and the mechanism of the cassette holder can be simplified.

By positioning the center of rotation of the reel using a reel positioning unit that is integrated with the reel stand, rather than through another member from the reel stand to which rotational driving force is directly transmitted from the outside, The center of rotation of the reel can be positioned with high precision.

[Brief explanation of drawings]

Figure 1 is a sectional view of the main parts of a conventional tape cassette.
Fig. 2 is a sectional view of the main part of a reel stand into which a tape cassette is inserted, Fig. 3 is a sectional view of the main part of a conventional tape cassette when it is inserted into the reel stand, and Fig. 4 is a sectional view of the main part of a conventional tape cassette. FIG. 5 is a sectional view of the main part of the tape cassette in an embodiment of the present invention, and FIG. 6 is a sectional view of the main part of the tape cassette in an embodiment of the present invention. FIG. 7 is a cross-sectional view of the main part of the reel stand, FIG. 7 is a cross-sectional view of the main part when the tape cassette is inserted into the reel stand in one embodiment of the present invention, and FIG. 8 is a cross-sectional view of the main part of the tape cassette in another embodiment of the present invention. FIG. 3 is a cross-sectional view of the main part when the reel is inserted into the reel stand. 1...Magnetic tape, 4...Tape cassette, 1
1... Reel, 23... Reel hub, 23a...
Reel engaging portion, 23b... Reel drive engaging claw.

Claims (1)

[Claims for Utility Model Registration] (1) At least one reel rotatably attached to a housing and wound with magnetic tape, and a plurality of reel drive engagements protruding toward the center of the reel. and a reel engaging part that fits into a part of a reel stand that rotationally drives the reel and positions the rotation center of the reel, and the reel engaging part is configured to drive the reel in the axial direction of the reel. A tape cassette located below the engaging part. (2) The tape cassette according to claim 1, wherein the tape cassette has an inclined surface from the reel engaging portion to the lower end surface of the reel.