JPS5843103Y2 - tape reel - Google Patents

Description

[Detailed description of the invention] The present invention relates to a tape reel for winding magnetic tape, and in particular, a plurality of adjustment slits other than the slits for guiding and locking the end of the magnetic tape are provided on the outer periphery of the hub. The present invention relates to a tape reel that prevents deterioration of the shape of a wound magnetic tape.

2. Description of the Related Art Conventionally, tape reels shown in FIGS. 1 and 2 have been provided to be housed in tape cassettes for video tape recorders.

This consists of a flange hub body A in which a lower flange 1 and a hub 2 are integrally molded, and an upper flange body B which are integrally joined by heat treatment.

The flange hub body A has a top plate 3 stretched around the inner periphery of the hub 2, and a through hole 4 is provided in the center of the top plate 3.

Further, the inner circumferential surface of the hub 2 serves as an engaging portion 5 for a reel drive shaft (not shown).

The upper surface of the hub 2 is provided with two-stage annular notches 6, 1 and two high and low projecting edges 8, 9 sandwiching the annular notches 6, 1.

Among these, the projecting edge 8 is thinner and higher than the projecting edge 9, and the annular notch 1 is deeper than the annular notch 6, so that appropriate elastic deflection of the projecting edge 8 in the inner and outer directions can be obtained.

On the other hand, the flange body B has a smaller outer diameter than the flange 1, and is designed to restrict upward deflection of the base of the magnetic tape wound around the hub 2.

Also, its center is a through hole 1 of the same size that communicates with the through hole 4.
A relatively shallow annular notch 11 is provided on the lower surface facing the annular notches 6, 1 and the projecting edges 8, 9.
2 and 13 are sequentially provided in the inner diameter direction.

By heat treatment such as thermal welding described above, the ridge 12 is bonded to the side surfaces of the annular notch 6 and the ridge 9, and the ridge 13 is bonded to the upper surface of the ridge 9, respectively.

However, although the projecting edge 8 faces into the annular notch 11, it is not in contact with or coupled thereto, and is free within the annular notch 11.

On the other hand, as shown in FIG. 2, a slit 14 is provided at one location of the hub 2 to guide the T-end of the magnetic tape into the hub 2. A clamp section is provided to hold the magnetic tape T, and the magnetic tape T is fixed there by a clamp member 15.

According to such a conventional tape reel, when the magnetic tape T is wound around the hub 2, the protruding edge 8 in the annular notch 11 bends uniformly on the circumferential surface according to the winding pressure, thereby reducing the cylindricity of the entire knob. This has the advantage of preventing lying down without causing any harm.

However, as shown in FIG. 2, there is a slit 14 on the circumferential surface of the hub 2 that guides the magnetic tape T into the hub 2.
During winding of the magnetic tape T, the amount of deflection in all directions of the inner circumference becomes non-uniform, resulting in deterioration of the shape of the magnetic tape T.

The present invention improves these conventional drawbacks, and in particular, provides a plurality of adjustment slits on the outer periphery of the bubble in addition to the slits for guiding the magnetic tape to equalize the amount of deflection in the inner circumferential direction of the bubble. An object of the present invention is to provide a new tape reel that effectively improves shape deterioration of magnetic tape.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a perspective view of a tape reel according to the present invention.

Incidentally, since the basic configuration is the same as that shown in FIG. 2, the same parts are given the same reference numerals and the explanation will be omitted.

That is, the difference from the conventional one is that in addition to the guide slit 14 of the magnetic tape T, three adjustment slits 116, 17, 18 are provided at positions that approximately equally divide the circumference of the bubble 2.
and four arcuate pieces 19 divided by these.
, 20°21.22 are bent in the inner circumferential direction with a predetermined elasticity.

In this case, three or more of the slits 16, 1γ, and 18 may be provided to make the outer periphery of the bubble 2 more uniformly bent. However, if the number is too large, warping may occur due to heat shrinkage during molding. On the contrary, there is a drawback that the winding condition of the magnetic tape deteriorates due to molding errors.

Therefore, it is necessary to take these into account and select an appropriate number.

In this case, it is better to determine the appropriate number depending on the molding material and thickness of the bubble 2.

Furthermore, if the depth of each of the slits 16, 11.degree. 18 is too deep, the above-mentioned pressing problem will occur again, so an appropriate value is selected depending on the molding material and thickness.

According to experiments, it has been confirmed that the height H of the bubble 2 is H/3 or less in the case of a bubble formed by ordinary resin molding.

As explained above, according to the present invention, in a tape reel in which a bubble is provided with a slit for guiding and fixing the end of a magnetic tape, an adjustment slit is provided in the bubble to cause the bubble to bend in the inner diameter direction. , there is an advantage that the magnetic tape can be wound without causing deformation or shape deterioration.

Since the adjustment slits for obtaining this effect can be obtained at the same time as the bub is molded, it can be obtained in large quantities and at low cost without increasing molding or other steps.

Therefore, it is of similar practical benefit.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional tape reel, FIG. 2 is a perspective view of the main parts, and FIG. 3 is a perspective view of the tape reel according to the present invention. 2...Bub, 14...Slit for magnetic tape guide, 16, 17.18...Adjustment slit.

Claims (2)

[Scope of utility model registration request] (1) In a tape reel having a slit for inserting and fixing the end of the magnetic tape on the outer circumferential surface of the knob around which the magnetic tape is wound, an adjustment slit is provided on the outer circumferential surface of the hub approximately parallel to the slit. A tape reel featuring the following. (2) The tape reel according to claim 1, wherein the adjustment slit has a depth of not more than 1/3 of the upper part of the nozzle.