JPH0531732Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a tape guide for VTR cassette tapes, and is mainly used by being attached to VTR cassette tapes. This invention relates to a tape guide for a VTR cassette tape that can be provided at a lighter weight and at a lower cost while ensuring the same accuracy and strength as the tape guide of the above tape guide.

(Prior Art) Conventional tape guides, like the tape guide 51 shown in FIG. 7, are made by cutting a stainless steel pipe into predetermined dimensions, or by winding a stainless steel pipe into a cylindrical shape to form a cylindrical body. , those whose inner and outer diameter dimensions have been machined so that they can be attached to the guide mounting shaft 52 of the cassette case C as shown in FIG. 8 have been mainly used.

Another conventional example is a tape guide for a cassette tape made of a thin-walled metal tube, which is proposed in Utility Model Application No. 168593/1983 (Kokai No. 74790/1983).

This tape guide is made by folding both ends of a thin metal tube inward to form a single layer at the center and a double layer at both ends.

(Problems to be solved by the invention) <Problems with conventional technology> Recently, cost reduction has been required for all VTR products, and tape guides for VTR cassette tapes are no exception.

There are only two ways to reduce costs: reducing processing costs and keeping material costs low.

However, in the case of the former type of tape guide 51, the only way to keep the processing cost low is to improve the processing process so that it can be easily formed, or to automate it to reduce labor costs. There is no.

However, in reality, this kind of tape guide 51
Most of the processing is automated, and even if the processing process is improved, it will not be possible to significantly reduce costs. In particular, hundreds of thousands of books or several
Currently, we are producing large quantities of 1 million pieces, so the processing cost per bottle is negligible.

Then, the only way left is to reduce the material cost as much as possible, but the tape guide 51 mentioned above
In this type, the entire body is molded from high-quality and expensive stainless steel, so if a large amount of material is used, the material cost cannot be reduced. In other words, it becomes expensive.

Therefore, an attempt was made to reduce the material cost by reducing the overall plate thickness, but due to the molding of the cassette case C, the standard inner diameter and standard external dimensions of the tape guide 51 have been standardized, so it is almost impossible to reduce the plate thickness. I couldn't make it thinner. In other words, if the inner diameter dimension is used as a reference value and the wall thickness is made thinner, the outer diameter becomes smaller. By doing so, when fast forwarding or rewinding the tape T in the cassette case C, the tape T approaches the case body and comes into contact with it because the gap between the case body C1 and the opening/closing lid C2 is very narrow. There is a problem that the tape T is easily scratched. However, if the wall thickness is made thinner using the outer diameter as the standard value, the inner diameter will be larger than the standard value, so when it is fitted onto the guide mounting shaft S, there will be play and the guide will not function as a guide, causing the cassette case to deteriorate. There was a problem in that the design of C itself had to be changed, leading to an increase in costs.

However, in order to actually overcome international competition, it is absolutely necessary to reduce costs, so although manufacturing companies are competing with each other, they have not yet been able to significantly reduce costs. Ta.

Therefore, the latter conventional example was devised to solve these problems.In the case of this conventional example, it is certainly effective when compared to the former conventional example in terms of cost reduction, but In actual manufacturing, for example, when molding is performed using a transfer machine, etc., in order to fold both ends into a double layer, there is a two-step process of first folding the ends inward and then folding them again. Since it is necessary, the number of molds must be increased accordingly, and the cost of the mold increases accordingly. Considering the unit price of this type of tape guide, the impact on the manufacturing cost of this tape guide is However, there was a big problem.

<Technical Issues> Therefore, in view of the above-mentioned problems, this idea was developed to significantly improve the tape guide used when attached to VCR cassette tape while ensuring the same dimensional accuracy and strength as conventional tape guides. This was devised with the aim of reducing costs and making it lightweight and inexpensive.

[Structure of the invention] (Means for solving the problem) This invention is a tape guide for a VTR cassette tape, which includes a tape guide main body formed of a thin-walled cylinder having a predetermined outer diameter, and a tape guide. By having reference inner circumferential circumferential parts formed at both ends of the main body by constricting the inner surface side or bending it into an inner flange shape at each end around the entire circumference or at an appropriate number of places. , which solves the above-mentioned problems.

(Function) The tape guide for a VTR cassette tape according to this invention has a tape guide main body formed of a thin-walled cylinder having a predetermined outer diameter, that is, a reference outer diameter for attaching to a VTR cassette tape. ensure that Then, at both ends of this tape guide body, the reference inner circumferential circumferential portion is formed by drawing the end portions inward or bending them into an inner flange shape to narrow the inner surface side, either over the entire circumference or at a suitable number of locations. In addition to ensuring the standard inner diameter dimensions, the wall thickness is also reduced to reduce the amount of material used.

As a result, there is no need to double-fold the mold as in the conventional example, so the number of molds can be reduced by at least one mold, making it possible to process at a lower cost. Since the structure is simply drawn inward or bent into an inner flange shape, it is possible to ensure some elasticity, and in reality, by setting the inner diameter standard dimension to be the same size as the shaft to be installed, or a slightly smaller diameter. Sufficient accuracy can be ensured by forcibly press-fitting the shaft into the mounting shaft.

(Embodiments) Hereinafter, embodiments of this invention will be described with reference to the drawings.

First Embodiment Reference numeral 1 shown in FIG. 1 is a tape guide used for a VTR cassette tape, which includes a tape body 2 formed of a thin-walled cylinder having a predetermined standard outer diameter dimension, and It is comprised of reference inner diameter circumferential contact portions 3 formed at both ends by narrowing the respective end portions inward in an inner flange shape so as to narrow the inner surface side over the entire circumference.

The tape guide 1 is made of stainless steel, and has a wall thickness of, for example, 0.15 to 0.3 mm.
In the VHS format, the dimensions are a standard outer diameter of 6 mm, a standard inner diameter of 4.8 mm, and a length of 16 mm.In other words, the outer diameter of the tape body 2 is 6 mm, and the inner diameter of the reference inner diameter circumferential part 3 is 4. 8mm, length of tape body 2 is 16
mm. In the case of the beta matrix method, the outer diameter of the tape body 2 is φ4.9 mm, the inner diameter of the reference inner diameter circumferential portion 3 is φ3.5 mm, and the length of the tape body 2 is 17.8 mm.

Although not shown in the drawings, the tape guide 1 is formed by, for example, deep drawing a thin stainless steel plate in a transfer press process or a progressive press process to form a bottomed cylinder having an outer diameter of φ6 mm. Next, we drilled a hole in the bottom of this bottomed cylinder to a diameter of 4.8 mm.
A hole is drilled to form a reference inner diameter circumferential part 3 at one end, and finally, the opening edge of the bottomed cylinder is narrowed inward into a flange shape to form a reference inner diameter circumferential part 3 at the other end. The inner diameter of the shiso is also φ4.8mm. or,
Alternatively, the pipe material can be cut to a predetermined size and both ends of the pipe material are squeezed inward to form a flange shape.

The tape guide 1 formed in this way is attached to the guide mounting shaft S of the cassette case C as shown in FIG.
It is installed by fitting it onto the outside. Then, even if the wall thickness is 0.15 to 0.3 mm as described above, the outer diameter is φ6 mm and the inner diameter of the reference inner diameter circumferential portion 3 is φ4.8.
Since it is mm, both the inner and outer diameters are standard dimensions (VHS method)
It can be installed without any play. In addition, by forming the reference inner diameter circumferential portion 3,
The overall strength of the tape guide 1 is increased, and even if the tape guide 1 is thin, it can maintain almost the same strength as the standard tape guide 51. Therefore, even if the material cost is significantly reduced by making the wall thinner, the conventional tape guide 5
1, and because it has a structure that can be formed by continuous press processing, it is excellent in mass production, and together with a significant reduction in material costs, it is possible to provide a lightweight and inexpensive tape guide 1. It is something.

Second Embodiment As shown in FIG. 2, the tape body 12 in the tape guide 11 and the reference inner circumferential circumferential portion 13 at one end thereof are the same as those in the first embodiment, but the reference inner circumferential circumferential portion at the other end is the same as that of the first embodiment. 3 into a chamfered shape (a kind of inner flange shape), and the inner diameter thereof is φ4.8 mm.

The tape guide 11 formed in this way is
It can be molded by the same steps as in the example and has the same effects.

Third Embodiment As shown in FIG. 3, the tape body 22 in the tape guide 21 is the same as in the first embodiment, but
The reference inner diameter circumferential portions 23 formed at both ends thereof are both chamfered. Even if the tape guide 21 has such a shape, it can be molded in the same steps as in the first embodiment, and the same effects can be achieved.

Fourth Embodiment As shown in FIG. 4, the tape body 32 in the tape guide 31 is the same as that in the first embodiment, but
Of the reference inner diameter circumferential parts 33 formed at both ends, the reference inner diameter circumferential part 33 at one end is the same as the first embodiment, and the reference inner diameter circumferential part 33 at the other end is formed as follows. Formed. In other words, the other end of the tape main body 32 is bent from the side to bulge out to narrow inward at an appropriate number of locations evenly distributed in the circumferential direction, three locations in the illustration, to form protrusions surrounding the reference inner diameter. 34, this reference inner diameter circumferential protrusion 34 is used as a reference inner diameter circumferential portion, and the diameter of a circle inscribed in the reference inner diameter circumferential protrusion 34 is formed as the reference inner diameter. In this case as well, even if the reference inner circumferential circumferential portion 33 at the other end is formed as the reference inner circumferential protrusion 34, the parts other than the reference inner circumferential protrusion 34 can be molded in the same process as in the first embodiment. Furthermore, the effects are similar to those of the first embodiment.

Fifth Embodiment As shown in FIG. 5, instead of the reference inner circumferential protrusion 34 of the fourth embodiment, a reference inner circumferential circumferential piece 44 is bent and formed, similar to the fourth embodiment. It can be molded into a similar shape and produces similar effects.

In addition, for example, instead of the reference inner diameter circumferential contact portions 3 at both ends of the tape body 2, both may be formed with reference inner diameter circumferential protrusions 34 or reference inner diameter circumferential contact pieces 34, and the same can be done. This has the following effects.

It goes without saying that the tape guide for a VCR cassette tape according to this invention is not limited to the embodiments described above.

[Effects of the invention] This invention constructed as described above is a tape guide for a VTR cassette tape. At both ends of the guide body 2, 12, ..., the reference inner diameter circumference is formed by constricting the inner surface side or bending it into an inner flange shape at each end around the entire circumference or at an appropriate number of places. The parts 3, 13, . . . ensure the standard outer diameter dimension for attaching to the VTR cassette tape C, and the reference inner diameter circumferential parts 3, 13, . . . also ensure the standard inner diameter dimension. However, even if the material is thin, when it is attached to the guide mounting shaft S of the cassette tape C, there is no play and the tape T is placed in a predetermined position to ensure fast forwarding without damaging the tape T. You can rewind.

Since it is formed with a thin wall like this, the material can be reduced by about 1/2 to 1/5 compared to conventional tape guides, which can reduce costs accordingly. By reducing the wall thickness, processing becomes easier and processing time can be shortened. As a result, the total cost for mass production can be significantly reduced.

Moreover, even if the material cost is significantly reduced by making the wall thinner, the strength is increased by molding the reference inner diameter circumferential portions 3, 13, . . . , so that the tape guide 1 has strength comparable to the conventional tape guide 51. , 12, ..., and has a structure that can be formed by continuous press processing, so it is excellent in mass production, and together with a significant reduction in material costs, it provides lightweight and inexpensive tape guides 1, 12, ... It is also easy to handle.

In actual manufacturing, there is no need to double fold as in the conventional example.
It is possible to reduce the number of molds by at least one mold, which enables cheaper processing, and because the structure is simply drawn inward or bent into an inner flange shape to narrow the inner surface, it has some elasticity. In fact, if the inner diameter reference dimension is set to be the same size as the shaft to be attached or slightly smaller in diameter, sufficient accuracy can be ensured by forcibly press-fitting the shaft to the shaft to be attached.

As described above, according to this invention, the tape guide used by attaching it to a VTR cassette tape can be handled in a lightweight manner while ensuring the same dimensional accuracy and strength as conventional tape guides, while achieving significant cost reductions. This has practical effects such as being able to provide products with excellent properties at a lower cost.

[Brief explanation of the drawing]

1 to 6 show embodiments of this invention. FIG. 1 is a partially cutaway perspective view of the first embodiment, FIG. 2 is a sectional view of the second embodiment, and FIG. 3 is a cross-sectional view of the second embodiment. FIG. 4 is a partially cutaway perspective view of the fourth embodiment; FIG. 5 is a partially cutaway perspective view of the fifth embodiment; FIG.
The figures are cross-sectional views showing the attached state of the tape guide of the first embodiment, FIG. 7 is a cross-sectional view of the conventional tape guide, FIG. 8 is a cross-sectional view showing the same attached state, and FIG. FIG. 3 is a plan view of the guide in an attached state. 1...Tape guide, 2...Tape body, 3...
... Reference inner circumferential portion, 11 ... Tape guide, 12
... Tape body, 13 ... Reference inner diameter circumferential part, 21
...Tape guide, 22...Tape body, 23...
...Reference inner diameter circumferential portion, 31...Tape guide, 32
... Tape body, 33 ... Reference inner diameter circumferential part, 34
...Reference inner diameter circumferential protrusion, 41...Tape guide,
42...Tape body, 43...Reference inner diameter circumferential part,
44...Reference inner diameter circumferential piece, 51...Tape guide, 52...Guide mounting shaft, C...Cassette case, C1...Case body, C2...Opening/closing lid, S...
...Guide mounting shaft, T...tape.

Claims (1)

[Scope of utility model registration request] In a tape guide for a VTR cassette tape, a tape guide body is formed of a thin-walled cylinder having a predetermined outer diameter, and each end is provided at both ends of the tape guide body, either over the entire circumference or in an appropriate number. 1. A tape guide for a VTR cassette tape, characterized in that the tape guide comprises a standard inner circumferential circumferential portion formed by drawing inward or bending into an inner flange shape to narrow the inner surface.