JP3271292B2 - Manufacturing method of magnetic tape guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a novel magnetic tape guide. More specifically, it is intended to manufacture a magnetic tape guide at low cost and to provide an inexpensive tape cassette using such a magnetic tape guide.

[0002]

2. Description of the Related Art In a tape cassette, usually, a tape reel having both ends of a magnetic tape fixed thereto is rotatably housed in a cassette case, and a part of a magnetic tape guide is formed from a tape outlet formed in a front portion of the cassette case. It is led out of the cassette case and positioned along the front surface of the cassette case. At this time, the magnetic tape is wound around a magnetic tape guide provided at the tape outlet.

A magnetic tape guide in a conventional tape cassette is formed as shown in FIG. 6 (a) or 6 (b).

A magnetic tape guide a shown in FIG. 6A is formed by forming a nonmagnetic steel plate, for example, stainless steel or brass into a cylindrical shape and polishing the surface thereof.

A magnetic tape guide b shown in FIG. 6 (b) is also made of a non-magnetic steel plate having a cylindrical shape, and has V-shaped cuts d and d at both upper and lower ends of a seam c. is there.

[0006]

Since the above-mentioned conventional magnetic tape guides a and b have a perfect cylindrical shape or a substantially perfect cylindrical shape, not only an extra material is required, but also the production of the same. There is a problem in that extra steps are required, which increases costs.

That is, the conventional magnetic tape guides a and b
In the production of (1) material of plate material such as SUS305, (2)
Welding of curl and seam to cylindrical shape, (3) cutting to predetermined length, (4) polishing of cut end face, (5) chamfering and surface polishing of cut end face, (6) sorting total length and inner diameter for all numbers, (7) Grind the outer surface to adjust the outer diameter, (8) Finish polishing of the outer surface, (9) Appearance sorting, (10) Packing, (11) Shipping, and 11 processes are required.

[0008]

SUMMARY OF THE INVENTION In view of the above, a magnetic recording medium according to the present invention has
In order to solve the above-mentioned problems, in the method of manufacturing the air-tape guide , two portions of the edge facing the band-shaped non-magnetic material are used.
Continuously make rectangular cuts, leaving several times with a pressing rod
Rectangle surrounded by notches by pressing over
Round the part into a cylinder and press the rod between the sides of the rectangular part.
Finish the above press when the interval is about to exit
And cut off the discontinuous part of the cut
A part of the cylindrical body is missing throughout its axial direction.
A magnetic tape guide is formed .

[0009]

[0010]

Accordingly, the manufacture of the magnetic tape guide according to the present invention.
According to the method, it is possible to manufacture with a smaller number of materials as compared with the conventional method, and it is possible to reduce the number of manufacturing steps and to manufacture at extremely low cost.

Also, a method of manufacturing the magnetic tape guide of the present invention.
The tape cassette using the magnetic tape guide manufactured by the company is also inexpensive.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the method of manufacturing a magnetic tape guide according to the present invention will be described below with reference to the accompanying drawings.

First, the tape cassette 1 will be described.

Reference numeral 2 denotes a cassette case, which is formed by abutting two upper and lower cassette halves 3 and 4 and has a flat box shape having a horizontally-long rectangular shape when viewed from above.

Numerals 5 and 5 denote tape reels rotatably housed in the cassette case 2. Both ends of the magnetic tape 6 are fixed and wound.

A part of the magnetic tape 6 is led out of the cassette case 2 from tape outlets 7 formed at both ends of the front surface of the cassette case 2 and is stretched along the front surface of the cassette case 2.

An open / close lid (not shown) is provided on the front surface of the cassette case 2 so as to cover and protect the front of the portion of the magnetic tape 6 located along the front surface of the cassette case 2 when not in use. It has become.

Numerals 8 and 8 denote magnetic tape guides, which are arranged at ends of the tape outlets 7 and 7 which are closer to each other. The magnetic tape 6 is wound around the magnetic tape guides 8 and 8.

The magnetic tape guide 8 is made of a non-magnetic steel plate and has a shape in which a portion 8a of the cylindrical body is absent over the whole in the axial direction.

Reference numerals 9 and 9 denote annular protrusions protruding from the tape outlets 7 and 7 of the lower half 4 at ends closer to each other.
The projections 9, 9 are formed with substantially annular press-fitting grooves 10, 10, which are opened on the upper surfaces thereof. And the press-fit groove 10,
The incomplete portion 10, that is, the portion that is not a groove is on the side of the ridges 9, 9 facing the center of the lower half 4.

Reference numeral 11 denotes a tape outlet 7 of the upper half 3.
7 are annular ridges protruding from the ends closer to each other, and the ridges 11, 11 are substantially open to the lower surface thereof at portions facing the press-fit grooves 10, 10 of the lower half 4. Annular press-fit grooves 12, 12 are formed.

The press-fit grooves 10, 10 and 12, 12
The length of the discontinuous portion is the same as or slightly smaller than the length of the missing portions 8a, 8a of the magnetic tape guides 8, 8.

The lower end portions of the magnetic tape guides 8, 8 are press-fitted into the press-fitting grooves 10, 10 of the lower half 4, and the upper end portions are press-fitted into the press-fitting grooves 12, 12, of the upper half 3. Tape guides 8 and 8 are cassette case 2
At a predetermined position.

The above-described magnetic tape guide 8 is made of a non-magnetic steel plate, for example, stainless steel, brass, aluminum, or the like, and has a shape in which a part of the cylinder is missing entirely in the axial direction by pressing and multiforming. Formed into
Outer peripheral surface by special barrel finishing, that is, tape running surface 8
b is polished smoothly, and the cut surfaces 8c, 8c and the upper and lower end surfaces are chamfered.

That is, as shown in FIG. 4, rectangular cuts 15 are continuously formed except for two portions 14 and 14 of the edge facing the band-shaped non-magnetic material 13, and a portion surrounded by the cuts 15 is formed. 5 is pressed several times with a pressing rod 17 as shown in FIG. 5, and the state shown in FIG.
As shown in FIG. Then, FIG.
As shown in FIG.
When the interval is such that the gap 7 comes off, the press is terminated, the cut 15 is cut off at the discontinuous portions 14 and 14, and polishing and chamfering are performed.

In this way, the magnetic tape guide 8 is formed, and (1) material removal of a plate material such as SUS305, (2)
Pressing, (3) chamfering barrel processing, (4) finishing barrel processing, (5) bagging, (6) shipping, and from manufacturing to shipping are possible in six steps.

[0027]

As is apparent from the above description, in the method of manufacturing a magnetic tape guide according to the present invention, a tape reel having both ends of a magnetic tape fixed and wound thereon is rotatably housed in a cassette case. A part of the magnetic tape is led out of the cassette case from a tape outlet formed in the front portion of the cassette case, and is wound along a magnetic tape guide provided at the tape outlet along the front surface of the cassette case. Manufacturing method of a magnetic tape guide used in a tape cassette positioned
And leave two places on the edge facing the band-shaped non-magnetic material.
Make a continuous cut in the shape and press several times with a push rod.
Rectangular part surrounded by a notch
Into a cylindrical shape, and the gap between the side edges of the rectangular
When the interval is about
Of the cylinder by separating the
Part of the magnetic tape has a section that is missing throughout its axial direction.
A guide is formed .

[0028]

Therefore, the magnetic tape guide according to the present invention
According to the manufacturing method, it is possible to manufacture with a smaller number of materials as compared with the conventional one, and the number of manufacturing steps can be reduced, thereby making it possible to manufacture at extremely low cost.

Further, the method of manufacturing the magnetic tape guide of the present invention
The tape cassette using the magnetic tape guide manufactured by the company is also inexpensive.

It should be noted that each of the specific shapes and structures shown in the above embodiments is only an example for embodying the present invention, and the technical scope of the present invention is interpreted in a limited manner. It is not something to be done.

[Brief description of the drawings]

FIG. 1 is manufactured by the method of manufacturing a magnetic tape guide of the present invention.
FIG. 2 is a horizontal sectional view showing a tape cassette using a magnetic tape guide .

FIG. 2 is an exploded perspective view showing, on an enlarged scale, a mounting portion of a magnetic tape guide .

FIG. 3 is an enlarged perspective view of a magnetic tape guide.

FIG. 4 is a plan view showing an example of material removal of a magnetic tape guide.

FIG. 5 is a side view showing an example of a pressing process during a manufacturing process of the magnetic tape guide.

FIG. 6A shows another example of the conventional magnetic tape guide.
(B) It is an expansion perspective view shown in each.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Tape cassette 2 Cassette case 5 Tape reel 6 Magnetic tape 7 Tape exit 8 Magnetic tape guide 8a Missing part 13 Non-magnetic material 14 Discontinuous cut part 15 Cut 16 Rectangular part 17 Pressing rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 23/113 G11B 23/087

Claims (1)

(57) [Claims] 1. A tape reel having both ends of a magnetic tape fixed and wound thereon is rotatably housed in a cassette case, and a part of the magnetic tape is inserted into a cassette through a tape outlet formed in a front portion of the cassette case. A magnetic tape used in a tape cassette that is led out of the case and wound along a magnetic tape guide provided at the tape outlet and positioned along the front surface of the cassette case.
A method of manufacturing a guide, comprising :
The notch is formed continuously by pressing it several times with a pressing rod.
The enclosed rectangular portion is rounded into a cylindrical shape, and the interval between both side edges of the rectangular portion is such that the pressing rod can be removed.
When the above interval is reached, the above press is terminated and the discontinuous portion of the cut is cut off to make a circle.
A part of the cylindrical body is missing throughout its axial direction.
Magnetic tape, which comprises forming a magnetic tape guide
How to make guides.