JPH0319183A - Tape reel - Google Patents

Abstract

PURPOSE:To prevent wrinkles in the leading-in and leading-out parts of a reader tape by locally thinning the thickness of the leading-in and leading-out parts of the reader tape in an external hub from the inner side of the external hub. CONSTITUTION:A part of the external hub 3a come to be thin parts 3d and 3d' from the inner side, and the reader tape 4 is led in and led out from that parts. The reader tape 4 is sandwiched by plural ribs 3c and is led in from the thin part 3d' on an opposite side, whereby it is led out to the external part of a reel hub 3. The leading-in and leading-out parts 3d and 3d' of the reader tape 4 are constituted to be thin from the inner side of the external hub 3a. Thus, the influence of the percentage of contraction for a material is released and a tape reel without the wrinkles in the reader tape 4 and with sperior appearance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to audio tape recorders. The present invention relates to a tape reel used in a tape cassette such as a video tape recorder or a data recorder, on which magnetic tape is wound.

Conventional technology In general, tape reels with a leader tape have a leader tape attached to a reel knob so that the leader tape is locked together with a crank ζ in a notch formed on the outer periphery of the reel hub. When the leader tape is attached to the reel hub using a clamper in this manner, a step is likely to be created by the clamper on the outer periphery of the reel hub, and performance is likely to deteriorate due to the phenomenon of bleed-through onto the magnetic tape.

As a measure to prevent this phenomenon of bleed-through, attempts have been made to form the leader tape integrally with the reel hub to prevent the formation of a step on the outer periphery of the reel hub.

Figure 4 shows a button and Figure 6 shows a tape reel with a leader tape integrally attached. 4 and 6, 1 is a tape reel main body, 1a is an upper flange, 1b is a lower flange, 1a is a reel hub, and 2 is a leader tape. The leader tape 2 is integrally formed with the reel hub 1C.

Such tape Lee/L'1 is 7 of leader tape 2.
, the retracting portion 11 of the bulb 1C. Since there is no level difference in the drawer portion 1d, the magnetic tape (not shown) can be mounted with high accuracy without any traces.

Here, the reel hub 3C is connected to the inner hub 1 as shown in FIG.
l button, outer hub 1q, and a plurality of ribs 1f and b connecting the inner and outer hubs, the leader tape 2 is drawn in from the outside of the outer hub 1q and supported by the plurality of ribs 1f, and It is pulled out to the outside of the outer hub 1q.

Problems to be Solved by the Invention However, in the conventional configuration as described above, the leader tape 2 is integrally shaped along the hollow part 1● of the reel hub 1c, and the outer hub 1q and the inner hub Since the outer hub 19b is pulled in between the ribs 1f connecting the outer hub 11 and the outer hub 1q is pulled out to the outside, due to the difference in material shrinkage rate between the pull-in part 1j and the pull-out part 1d,
There was a problem in that wrinkles (Fig. 3) 1h appeared on the leader tape 2, deteriorating its appearance.

Means for Solving the Problems In order to solve the problems, the tape reel of the present invention is characterized in that the wall thickness of the leader tape retracting portion and the pull-out portion of the outer hub is made thinner from the inner surface of the outer hub. It is.

Further, in the tape reel of the present invention, the wall thickness of the leader tape retracting portion and the pull-out portion of the outer hub is locally thinner from the inner surface of the outer hub, and the leader tape width direction of the plurality of lips carrying the leader tape is configured to be thinner. The length of the leader tape is longer than the width of the leader tape, and a portion of the rib extends from each of the upper and lower ends of the leader tape.

Function: The tape reel of the present invention has thinner wall thicknesses at the lead-in and pull-out parts of the leader tape from the inner surface of the outer hub, which alleviates the effects of material shrinkage and provides an extremely excellent appearance with no wrinkles on the leader tape. You can get a reel of tape.

In addition, since the tape reel 17 of the present invention extends a portion of the ribs at the upper and lower ends of the leader tape, the supporting force of the leader tape attached to the reel hub can be increased, and the leader tape can be held against the reel hub. It can be installed securely.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows a tape Lee according to an embodiment of the present invention. 1, outer hub 3a and inner hub 3 are provided coaxially at the center of lower flange 1b, which is a reel hub.
b, and these outer hub 3a and inner hub 3b are connected by a plurality of ribs 3C. A portion of the outer hub 3a becomes a thin wall portion 3d, sd' from the inner surface side bb, from which the leader tape 4 is drawn in and pulled out. The leader tape 4 is sandwiched between a plurality of ribs 3C, drawn into the housing from the thin walled portion sd' on the opposite side, and pulled out to the outside of the reel hub 3 through the thin walled portion 3d.

It is desirable to select a material with a low shrinkage rate for the material of the reel hub 3 in order to alleviate the effects of material shrinkage after molding, but the pull-in of the leader tape. Each part of the drawer has a thin wall part ad,
By adopting the sd' structure, it is possible to sufficiently reduce the influence of the material shrinkage rate.

FIG. 2 shows a cross-sectional view of a part of the reel hub 3. The height L of the rib 3C that connects the outer hub 3a and the inner hub 3b is longer than the width dimension of the leader tape 4. There is. As a result, the leader tape 4 can be firmly attached to the reel hub 3, and by integral molding, it is possible to improve the attachment force of the leader tape to the reel hub when attaching the leader tape.

In the above embodiment, the height of the rib 13C was set larger than the width of the leader tape, but as shown in FIG. 3, the height of the rib 3c was set almost equal to the width of the leader tape. It is a good thing.

Effects of the Invention As described above, according to the tape reel of the present invention, the tape reel hub and the leader tape can be integrally formed, and the leader tape can be drawn in easily. Since each part of the drawer can be supplied with wrinkle-free and excellent appearance, there is no bleed-through phenomenon caused by the conventional tape clamping piece (clamper), and the number of parts is reduced, which reduces costs. Also, it is possible to realize an extremely inexpensive tape cassette.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts showing one embodiment of the tape reel of the present invention, FIG. 2 is a sectional view of the main parts of the same tape reel, and FIG. 3 is a diagram showing another embodiment of the tape reel of the invention. FIG. 4 is a perspective view of a conventional tape reel, and FIG. 6 is a sectional view of the same tape reel. 1b...Flange, 3...Reel hap,
3a...Outer hub, 3b...Inner hub, 3
C...Rep, 3d. 3d'...Thin section, 4...Leader tape.

Claims (2)

[Claims] (1) A hub body consisting of a flange, an inner hub and an outer hub coaxially formed at the center of the flange, and a plurality of ribs connecting the inner and outer hubs, and a hub body that is pulled in from the outside of the outer hub and a leader tape supported by a plurality of ribs and formed integrally with the hub body so as to be pulled out to the outside of the outer hub; A tape reel characterized in that the wall thickness is locally thinned from the inner surface side of the outer hub. (2) A hub body consisting of a flange, an inner hub and an outer hub coaxially formed at the center of the flange, and a plurality of ribs connecting the inner and outer hubs; a leader tape supported by a plurality of ribs and formed integrally with the hub body so as to be pulled out to the outside of the outer hub; The leader is configured such that the wall thickness is locally thinned from the inner surface side of the outer hub, and the dimension of the plurality of ribs supporting the leader tape in the width direction of the leader tape is configured to be longer than the width dimension of the leader tape. A tape reel characterized by a portion of ribs extending from the upper and lower ends of the tape.