JPH02179978A - Tape reel - Google Patents

Abstract

PURPOSE:To improve an appearance and a quality by forming the diameter of a caulking trace to fix an upper reel to a lower reel so as to be approximately the same as that of a rotation display hole, and using the caulking trace for a part of rotation display. CONSTITUTION:The diameter of a fixed projection 9 is set so that an external diameter d1 may be approximately the same as the internal diameter of a rotation display hole 11, namely an external diameter d2 of a positioning projection 15 in a caulked condition with its upper edge part inserted. Consequently when a tape reel 2 is rotated, the caulking trace 9a of the fixed projection 9a and the positioning projection 15 fitted to the rotation display hole 11 can be observed as a series of rotation display, and the rotation of the tape reel 2 can be easily confirmed. Thus by using the caulking trace 9a of the fixed projection 9 to fix an upper reel member 5 and a lower reel member 8 for one part of the rotation display of the tape reel, the rotation display art of the tape reel 2 can be formed so as to have a simple and beautiful appearance on a design basis without being messy.

Description

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

[Summary of the invention]

The present invention improves the design of tape reels built into video tape cassettes, etc. by using the caulking marks for fixing the upper reel to the lower reel as rotation indicators for checking the rotation of the tape reel. This realizes a tape reel with good appearance quality.

[Prior Art] For example, in a video tape cassette used in a video tape recorder, as shown in FIG. 4, a pair of tape reels (2) are built into a cassette case (1). A magnetic tape (3) is wound and stored inside. The magnetic tape (3) wound around the tape reel (2) can be visually observed through a transparent window (1a) formed on the top surface of the cassette case (1).

A tape reel built into a video tape cassette usually has flanges at the top and bottom to prevent the wound magnetic tape from moving in the width direction.

In this tape reel with upper and lower flanges, the upper reel member on the upper flange side and the lower reel member on the lower flange side are molded separately, and the upper reel member is welded and fixed to the lower reel member by caulking during the assembly manufacturing process. (For example, Utility Model Publication No. 57-9983).

By the way, in this type of tape reel, a plurality of holes are arranged in a circle at predetermined intervals in the center of the top surface, and the rotation of the tape reel can be visually checked from outside the cassette case through these holes. There is something.

A conventional tape reel of this type will be explained with reference to FIG. The member (5), the lower flange (6) and the hub (
7) and a small downward member (8).

The upper reel member (5) is made of a colorless and transparent resin material, while the lower reel member (8) is made of a resin material colored, for example, white. are combined and fixed by welding and caulking.

That is, on the upper surface of the hub (7) of the downward small member (8), fixing protrusions (9) are protruded at a plurality of locations at predetermined intervals (in this example, three locations at intervals of 120'); A fixing hole (10) is bored in the center of the upper reel member (5), and in the assembly manufacturing process, after the fixing protrusion (9) is inserted into the fixing hole (10), the fixing protrusion is inserted into the fixing protrusion (9). The upper reel member (5) and the lower reel member (8) are fixed by crushing and caulking the upper end portion of (9) by, for example, ultrasonic melting.

In this tape reel (2), a plurality (six in this example) of rotation display holes (11) are formed on the upper surface of the hub (7) of the downward small member (8). The rotation display holes (11) are located on a circle a centered on the rotation center of the tape reel (2), and are arranged at equal intervals. 5) so that it can be visually observed from the top surface of the tape reel.

Note that (12) is a center pin that protrudes from the center of the upper surface of the hub (7) of the lower reel member (8), and this center pin (12) is bored at the center of the upper small member (5). When the tape reel (2) is housed in the cassette case (1), the tip of this center pin (12) passes through the center hole (13) and protrudes from the upper surface of the reel hub. It comes into contact with the reel presser blade provided on the back side of the reel.

Then, with the tape cassette equipped with the tape reel (2) configured as described above loaded into the tape recorder main body and driven, the tape reel (2) is inserted through the transparent window (1a) of the cassette case (1). ) By looking at the rotation indicator hole (11), the rotation of the tape reel (2) can be confirmed, that is, it is possible to recognize and determine whether or not the tape is running normally.

[Problem to be solved by the invention]

However, in this conventional tape reel, in addition to six rotation display holes (11) visible through the transparent upstream small member (5), there are also three rotation display holes (11) with different diameters in the center of the upstream small member (5). The caulking mark (9a) of the fixing protrusion (9) at the location
) are exposed, resulting in a cluttered appearance in terms of design and an impression of poor quality.

The present invention has been made in view of the above, and aims to provide a tape reel with excellent appearance quality by effectively utilizing the caulking marks for fixing the upper small member to the lower reel member. purpose.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a tape reel in which an up-rule and a down-rule are fixed by caulking, and which has a plurality of rotation display holes in the center. , the caulking mark is formed to have approximately the same diameter as the hole for rotation display, and this caulking trace is used as a part of the rotation display.

[Effect]

By using the caulking marks as part of the rotation display, the center of the tape reel is formed into a simple and beautiful appearance without being cluttered like in the past. We can provide tape and reel.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 3. Parts corresponding to those in the conventional example shown in FIGS. 4 to 5 described above will be given the same reference numerals, and their explanation will be omitted. .

In this example, a colored part (14) made of a resin material of a color different from the white of the lower reel member (8), for example, black, is provided at the center of the upstream small member (5) having a transparent upper flange (4).
) is formed by two-color molding, and this colored part (14
) is provided with a rotation display hole (11). In this example, the rotation display holes (11) are located at three locations at intervals of 120° on a circle a centered on the rotation center of the tape reel.

Also, corresponding to this rotation display hole (11), the downward-small member (
A positioning protrusion (15) with an outer diameter approximately equal to the inner diameter of the rotation display hole (11) is provided on the upper surface of the hub (7) of the upper reel member (5) and the lower reel member (5). 8), this positioning protrusion (15) is inserted into the rotation display hole (1).
1), the upper reel member (5) can be accurately positioned.

Further, in this example, the upper reel member (5) and the lower reel member (8)
) and the fixing hole (10) into which the fixing protrusion (9) is inserted are formed in the same arrangement as the rotation display hole (11). That is, these fixing protrusions (9) and fixing holes (10) are formed at three locations located on a circle a centered on the rotation center of the tape reel, and each fixing protrusion (9) and fixing hole (10) are rotation display holes (11
) and the rotation display hole (11).

The fixing protrusion (9) has its upper end crushed and caulked so that the outer diameter d1 of the caulking mark (9a) is the rotation indicator hole (
11), that is, its diameter is set to be approximately equal to the outer diameter d2 of the positioning protrusion (I5).

In assembling the tape reel constructed as described above, first, as shown in FIG.
) of the lower reel member (8) and at the same time insert and fit the positioning projection (15) into the rotation display hole (11).
) are inserted and fitted and positioned, and from this state, as shown in FIG. 3, the upper end of the fixing protrusion (9) is crushed and caulked by ultrasonic melting or the like. At this time, the outer diameter d1 of the caulking mark (9a) of the fixing protrusion (9) is formed to be approximately the same diameter as the outer diameter d2 of the positioning protrusion (15).

The tape reel of this example assembled in this way has a fixing protrusion (9) projected from the downward small member (8) side on the upper surface of the black colored part (14) of the upper reel member (5). The positioning protrusion (15) is exposed, and the diameters of the clamping mark (9a) of the fixing protrusion (9) and the positioning protrusion (15) are equal to each other, and the fixing protrusion (9) and the positioning protrusion (15)
) are all white and are integrated with the downward small member (8), so the center of the tape reel (2) appears as if six rotation display marks of the same type are formed at equal intervals. .

When the tape reel (2) is rotated, the caulking marks (9a) of this fixing protrusion (9) and the rotation display hole (1)
The positioning protrusion (15) fitted into the tape reel (1) can be seen as a series of rotating displays, making it easy to confirm the rotation of the tape reel (2).

As described above, in this example, the clamping marks (9a) of the fixing protrusion (9) for fixing the upper reel member (5) and the downward small member (8) are used as part of the tape reel rotation indication. As a result, the rotating display section of the tape and reel (2) is formed to have a clean, simple and beautiful appearance in terms of design, without being cluttered like in the past.

In particular, in this example, a black colored part (14) different from the white descending small member (8) is formed in the center of the ascending small member (5), and the descending part passes through this colored part (14). −Small parts (
8) From the side, remove the white fixing protrusion (9) and positioning protrusion (1).
5) is exposed to form the rotation display section, so this rotation display section is formed much more clearly than before, which not only has a design effect but also has the advantage of making it easier to confirm the rotation of the tape reel. has.

〔Effect of the invention〕

As described above, according to the present invention, the caulking trace for fixing the upper reel to the lower part is formed to have approximately the same diameter as the rotation display hole, and this caulking trace is used as a part of the rotation display. As a result, the center of the tape reel can be formed with a cleaner and more beautiful appearance than before.
This has the effect of improving the appearance quality of the tape reel.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the tape reel of the present invention, FIGS. 2A and B are a plan view and a sectional view taken along the line I-I of the tape reel of the present invention before caulking, and FIGS. 3A and B are 4 is a perspective view of a videotape cassette with a built-in tape reel; FIGS. 5A and 5B are plan views of a conventional tape reel and its It is a sectional view taken along the line -■. In the figure, (2) is a tape reel, (5) is an upper reel member,
(8) is the lower reel member, (9) is the fixing protrusion, (9a) is the caulking mark, and (11) is the rotation display hole. Agent Sadado Ito Hidemori Matsukuma Chi 7 reel #4. View diagram 1

Claims (1)

[Claims] The upper reel is fixed to the lower reel by caulking, and
In a tape reel having a plurality of rotation display holes in the center, the caulking marks are formed to have approximately the same diameter as the rotation display holes, and the caulking marks are used as part of the rotation display. A tape reel characterized by: