JPH02199687A - Tape reel - Google Patents

Abstract

PURPOSE:To prevent an unequal elongation of a tape wound onto a tape winding wall part in the broadwise direction of the tape by forming a gap hole to a part connected by a lower flange between the tape winding wall parts arranged to a concentric part of a hub with a prescribed interval and a reel drive shaft insertion part and disconnecting both the parts. CONSTITUTION:A gap hole 20 is formed to a connection part of a lower flange 12 between a tape winding wall part 11a of a hub 11 and a reel drive shaft insertion part 11b and both the parts are disconnected. Thus, a stress caused when a tape winding pressure is exerted to the tape winding wall part is nearly equal to the lower flange and the upper flange and the tape winding pressure is received nearly equally in the broadwise direction of the tape thereby preventing the unequal elongation of the wound tape in the broadwise direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape reel, for example a tape reel applied to a videotape cassette.

[Summary of the invention]

The present invention relates to a tape reel that is applied to, for example, a videotape cassette, and is connected by a lower flange between a tape winding wall section of a hub and a reel drive shaft insertion section, which are arranged concentrically and spaced apart from each other at a required interval. By forming a gap hole in the part where the tape is wound and separating the two parts, the amount of deflection between the open upper part of the tape-wound wall part and the lower part on the lower flange side is approximately the same. This prevents the tape wound on the tape winding wall of the lever from elongating on one side (and eliminates causes such as incomplete erasure of recording/signals and level fluctuations, so that recording/playback can be performed smoothly and reliably. This is what I did.

[Conventional technology]

Conventionally, a tape reel as shown in FIG. 6 has been used as a tape reel to be attached to a tape cassette for a video tape recorder. This tape reel has an upper flange (1)
A hub is sandwiched between the lower flange (2) and the lower flange (2), and the hub is integrally provided on the lower flange (2) side. That is, in the center of one side of the lower flange (2) made of synthetic resin, for example, acetal resin, there is a substantially annular tape winding wall part (2a) constituting the hub and a reel drive shaft insertion part (2b).
This tape winding wall (2a
) and the reel drive shaft insertion part (2b).
C) are integrally provided in the radial direction, and a tape winding wall part (2a) is provided around the outer periphery of the central reel drive shaft insertion part (2b).
are placed.

A magnetic tape is wound around the circumferential surface of the wall portion (2a), and has a notch (2d) for locking one end of the wound magnetic tape to the reel side, so that one end of the magnetic tape is held between the two sides. A tape locking member (not shown) is fitted into the notch (2d) and locked. The reel drive shaft insertion part (2b) is used to rotate the reel by inserting the reel drive shaft (not shown) of the video tape recorder from the lower flange (2) side (lower side in Figure 6). On the upper surface of the drive shaft insertion part (2b) opposite to the insertion side of the reel drive shaft, there is a projection (2e) in the center for fitting with the upper flange (1), and this projection (2e).
A plurality of protrusions (2f) for caulking the upper flange (1) are provided at a position facing the upper flange (1). And the upper flange (
1) is made of, for example, a transparent acrylo-nitrilo-styrene copolymer resin, and the upper flange (1) side has through holes (1b) and (1c) fitted in the center with projections (2e) and (2f). ) is provided, and after fitting the central protrusion (2e) into the central through hole (1b) of the upper flange (1) and fitting each protrusion (2f) into the respective through hole (IC), The reel is completed by caulking using sound waves or the like. Note that there is a notch (2d) on the wall (2a) for securing the tape.
An opening (1a) is provided in the upper flange (1) at a position facing the tape to facilitate the tape locking operation.

The tape reel constructed as described above has a so-called large hub, which is provided on the outer periphery of the tape winding wall section (2a) separately from the reel drive shaft insertion section (2b).
Is the length of the tape that can be wound on the reel short? (However, the number of reel rotations is the same when fast forwarding and rewinding the tape once is compared to when the circumferential surface of the reel drive shaft insertion part (2b) is used as the tape winding wall directly.) However, it has the advantage of being fast.

However, when the magnetic tape is wound onto the tape reel configured as described above, the tape winding wall portion (2a) may be deformed by the magnetic tape winding balls or the like. That is, as shown in FIG. 7, the tape winding wall (2a) is connected to the magnetic tape (
3) and tends to fall inward, and in places where the above-mentioned reinforcing ribs (2c) are present, this reinforcing rib (2c) prevents the wall from falling down;
) falls inward from the upper flange (1), and as a result of this fall, the lower flange (2) also warps upward. In this way, the tape winding wall part (2a
) falls down, the part (3a) of the wound tape (3) closer to the upper flange (1) touches the wall (2), as shown in Figure 8.
In response to the fall of a), it becomes partially stretched. If this partial elongation occurs in the magnetic tape, there is a risk that good recording and reproduction of video signals and the like may not be possible.

In order to eliminate this drawback, the present applicant has previously proposed
A tape reel as disclosed in Publication No. 277 was proposed. For example, as shown in FIGS. 9 and 10, this tape reel has a tape winding wall portion (2a) of the hub and a reel drive shaft insertion portion (2b) of the hub separately, and an upper flange (1). ) A substantially annular protrusion (1d) is formed on the surface facing the lower flange (2) so that the upper opening edge of the tape winding wall (2a) is fitted onto the outer peripheral surface to prevent it from falling inward. This is what I did. By doing this, as shown in FIG. 10, the deformation of the tape reel, especially the tape winding wall (2a)
By eliminating the deformation of the tape, it is possible to eliminate the partial elongation of the tape wound on this reel.

The applicant has also proposed a tape reel as disclosed in Japanese Utility Model Application No. 62-80279. For example, as shown in Fig. 11, this tape reel has a tape winding surface of a tape winding wall part (2a) integrally formed with the lower flange (2) with a slope such that the lower flange (2) side becomes narrower. It is.

By doing this, when the tape is wound around the tape winding wall (2a), the wall (2a) bends inward, that is, contracts because the upper part where the upper flange is fixed is open. However, since it has a narrow downward slope, the diameter is approximately the same in the vertical direction, and it is possible to eliminate partial elongation of the tape wound around this tape winding wall (2a).

[Problem to be solved by the invention]

However, as shown in FIGS. 9 and 10, forming the annular protrusion (1d) on the upper flange (1) to prevent the tape winding wall (2a) from falling inward means that the upper flange (1) ) becomes complicated, and when assembling the upper and lower flanges, the annular protrusion (1d) and the tape winding wall (2
There is a disadvantage that a) abutment and engagement of the upper opening portion, that is, positioning, requires time and effort, and the assembly process becomes complicated, resulting in high cost.

In addition, when forming the tape winding wall part in a tapered shape of the lower box as shown in Fig. 11, the slope angle changes depending on various conditions in the molding process, making it difficult to form it in a constant tapered shape. There are some inconveniences that are difficult to obtain.

In view of the above, an object of the present invention is to provide a tape reel which has a simple structure, eliminates uneven deformation of the same portion of the tape winding on the hub, and prevents the tape from elongating on one side.

a reel drive shaft insertion part concentrically spaced apart from the second wall at a required interval, and a part connected by a lower flange between the tape winding wall part of the hub and the reel drive shaft insertion part. A gap hole is formed in the two parts, and the two parts are separated.

[Effect]

The tape reel according to the present invention includes a tape winding wall portion of the hub;
By forming a gap hole in the connection part between the reel drive shaft insertion part and the lower flange, and making it possible to separate both parts,
The stress generated when a tape roll is applied to the tape winding wall is approximately equal on the lower flange side and the upper flange side, and the tape roll is received almost equally in the width direction, making it difficult to wind the tape. This prevents the tape from stretching on one side.

[Means to solve the problem]

In order to achieve the above object, the tape reel of the present invention is provided such that the hub is integrally provided with the lower flange, and the upper flange is fixed to the upper end surface, and the tape winding wall portion is connected to the tape reel according to the present invention. An embodiment of the reel will be described with reference to FIGS. 1 to 5.

In Figures 1 to 5, (11) is the lower flange (1
2) is an integrated hub, and this hub (11) has a cylindrical tape winding wall part (lla) around which the magnetic tape T is wound.
and a cylindrical reel drive shaft insertion part (llb) located inside the winding wall part (lla) into which a reel drive shaft installed in a recording/reproducing device can fit. There is a required gap between the rotating wall part (lla) and the reel drive shaft insertion part (llb), and in this gap, both parts (l
la) and (Ilb) are connected at required intervals by rib pieces (llc).

In addition, the upper flange (1) of the reel drive shaft insertion part (llb)
The upper end surface to which 3) is fixed is formed by recessing the inner circumferential surface part to form an inner circumferential concave surface part (llb,), and the outer circumferential surface part (IToz) has a plurality of two holding pieces (14) in the illustrated example. Inner circumference concave part (1
1b+) side, and is formed to protrude toward the inner peripheral concave surface portion (lb+) side.
A fitting hole (15) with a protruding edge (15a) on the periphery is formed in the center of the inner circumferential concave surface (11b+), into which the center piece (16) is fitted. The reference planes (17) are formed at a plurality of locations, three locations in the illustrated example.

In addition, a clamp piece (
A clamp piece fitting part (18) is provided for clamping and fixing the end of the tape together with the lower flange (not shown).
Reel brake retaining teeth (19) are formed on the outer peripheral surface of 12).

In the present invention, a gap hole (not shown) is cut into the surface of the lower flange (12) that connects the tape winding wall (lla) and the reel drive shaft insertion part (llb) at their lower ends.
20) is formed. This gap hole (20) is formed between the aforementioned rib pieces (llc).

Furthermore, the above-mentioned upper flange (13) has a convex surface portion (convex surface portion) that is convex on the inner surface side that is fitted into the inner circumferential concave surface portion (llb+) formed on the upper end surface of the reel drive shaft insertion portion (llb) of the hub (11).
13a) is formed, and a fitting hole (15) of the hub (11), that is, a protruding edge (15a) is formed in the center of this convex portion (13a).
A center hole (21) is formed into which the center piece (16) is fitted and from which the upper end of the center piece (16) projects.

A circumferentially elongated arc-shaped hole (22) into which the retaining piece (14) is inserted is formed at the peripheral edge of the convex surface portion (L3a) in correspondence with the aforementioned retaining piece (14). Arc-shaped long hole (
An engaged stepped portion (23) that is engaged with the engaging piece (14) is formed on one end of 22), and a raised edge (23a) is formed on the upper edge of this stepped portion (23). has been done.

The hub (11) and upper flange (13) formed in this way
), first connect the convex portion (13a) of the upper flange (13) to the reel drive shaft insertion portion (llb) of the hub (1).
An arcuate long hole (22) corresponding to the concave part (llb, ) of )
is inserted into the engaging piece (14), and the convex surface portion (13a) is brought into contact with the concave surface portion (llb, ). In this case, in the illustrated example, the convex surface part (13a) will come into contact with the reference surface (17) formed on the concave surface part (Hb+), and the projecting edge of the fitting hole (15) will be in contact with the center hole (11). A center piece (16) is inserted through (15a).

In this state, by rotating the lower flange (12) and the upper flange (13) that are integral with the hub (11) in opposite directions, the arcuate elongated hole (2) of the upper flange (13) is rotated.
2) The engaged step portion (23) formed inside the hub (11)
is inserted into and engaged with the lower side of the engagement piece (14), and the raised edge (23a) is engaged with the negative edge of the engagement piece (14).

That is, when the engaged step portion (23) is engaged with the engaging piece (14), the retaining piece (14) is sandwiched between the inner end surface of the arcuate elongated hole (22) and the raised edge (23a). (see Fig. 5), the upper flange (13) does not rotate unnecessarily relative to the hub (11), and the lower flange (12) does not come off.
The tape reel is constructed by being securely fixed in a parallel state to the tape reel.

When the magnetic tape T is wound around the tape reel configured in this way, the tape winding wall (lla) of the hub (11)
Deflection occurs due to the addition of the winding ball of the magnetic tape T, but in this example, the tape winding wall (ll
a) and the reel drive shaft insertion part (llb).
20) is formed, both parts (lla) and (
llb) is in a separated state, and the lower part is bent in the same way as the upper part in the open state, that is, the tape winding wall part (lla) has almost the entire width due to the winding of the magnetic tape T. The same stress is generated, and the magnetic tape T receives the windings in the width direction of the magnetic tape T almost equally.
In this case, the one-sided elongation as shown in FIG. 8 described above does not occur.

In this way, according to this example, the conventional tape reel can be manufactured without forming an annular protrusion on the upper flange to prevent the tape winding wall of the hub from collapsing or changing the shape of the tape winding wall, i.e., as shown in FIG. Even if the shape is approximately the same as that of an ordinary tape reel as shown in FIG. 1, it is possible to prevent the magnetic tape from elongating on one side, so that recording and reproduction of the magnetic tape are not affected.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be modified in various ways without departing from the spirit of the present invention. For example, fixing the upper flange to the hub may be modified. Instead of fixing by engagement as in the above-mentioned embodiment, they may be melted and fixed by ultrasonic waves or the like as in the conventional example, and the lower flange and the upper flange may not be formed into a frame shape as shown in the figure (or plate). It may be formed into a planar shape, and the upper flange may be formed from a transparent material.

〔Effect of the invention〕

As described above, according to the present invention, the tape winding wall portion of the hub, which is integrally provided with the lower flange and the upper flange is fixed to the upper end surface, and the reel drive shaft insertion portion are connected by the lower flange. By forming the gap hole in the part, both parts become separated, and the lower part of the tape-wrapped wall part bends almost in the same way as the upper part which is in the open state. In this case, the stress generated by the winding balls of the magnetic tape is almost the same across the entire width, and the winding balls in the width direction of the magnetic tape are received almost equally, and the magnetic tape is wound and held without causing any one-sided elongation. Recording and playback can be performed smoothly.

In addition, in terms of structure, there is no need to provide a means to prevent the tape winding wall from falling on the upper flange or to change the shape of the tape winding wall, so the structure is simple, easy to manufacture, and cost-effective. be.

[Brief explanation of the drawing]

1 is a perspective view of an example of a tape reel according to the present invention, FIG. 2 is a partially cutaway exploded perspective view of the tape reel, FIG. 3 is a bottom view of the tape reel, and FIG. 5 is a sectional view of a portion of the same, FIG. 6 is an exploded perspective view of a conventional tape reel, FIG. 7 is a sectional view of the same, and FIG. 8 is a state of a conventional tape. FIG. 9 is a perspective view of the inner surface of the upper flange of the conventional tape reel on the other side, FIG. 10 is a sectional view of the tape reel, and FIG. It is a front view of a flange. In the figure, (11) is the hub, (lla) is the tape winding wall,
(Ilb) is a reel drive shaft insertion part, (12) is a lower flange, (13) is an upper flange, and (20) is a gap hole. Agent Hidemori Matsukuma 3rd

Claims (1)

[Claims] A reel drive shaft including a hub integrally provided with the lower flange and having the upper flange fixed to the upper end face thereof, and a tape winding wall portion, and a reel drive shaft concentrically spaced apart from the tape winding wall portion at a required interval. an insertion part, and a gap hole is formed in the part connected by the lower flange between the tape winding wall part of the hub and the reel drive shaft insertion part, so that the two parts can be separated. A tape reel featuring