JPH0289268A - Tape cartridge - Google Patents

Abstract

PURPOSE:To improve productivity by integrally forming a pair of an undrawing collar part and an undrawing projection part and slightly setting up a projection from the end of a window plate of the undrawing projection part so that the window plate is forcedly pressed into a window hole. CONSTITUTION:A pair of the undrawing collar part 9 and the undrawing projection part 10 abutted and engaged upon/with the inside and outside of the hole edge of the window hole 4 of a body case 1 to regulate undrawing in the inside- outside direction of the case are integrally formed on the end of a plastic-made transparent window plate 7. The projection part 10 is formed so as to be slightly projected from the end of the window plate 7 to forcedly press the window plate 7 into the window hole 4 and the collar part 9 and the projection 10 are alternately arranged in the peripheral direction of the window plate 7. Thereby, the window plate 7 is maintained in the window plate 4 in the undrawn state in the inside-outside direction of the case only by forcedly engaging the window plate 7 into the window hole 4 to press the projection part 10 into the window hole 4. Consequently, a bonding agent or a process bonded by fusing can be omitted and productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a tape cartridge, and particularly to an improved window structure for visually checking the tape winding amount.

[Conventional technology]

One method of configuring the window of a tape cartridge is to mold the main body case with a window hole and a transparent window plate separately, fit the transparent window plate into the window hole, and then bond them together using adhesive or ultrasonic welding. There are things that can be joined and integrated.

[Problem to be solved by the invention]

However, the above-mentioned conventional method requires an ultrasonic welding process for one transparent window or a bonding process using an adhesive, so that a significant improvement in productivity cannot be expected.

The present invention provides a tape cartridge in which a transparent window plate is fitted into the window hole of the main body case as described above, by devising means for preventing the transparent window plate from slipping out of the window hole, thereby eliminating the adhesive or welding process. The purpose is to improve productivity by being omitted, and to facilitate the formation of window panels.

[Means to solve the problem]

In order to achieve the above object, in the tape cartridge of the present invention, the end of the transparent window plate 7 made of plastic abuts and engages with the inner and outer surfaces of the hole edge of the window hole 4 of the main body case 1, so that the tape cartridge moves in the inner and outer directions of the case. A pair of retaining flange portions 9 and a retaining protrusion 10 are integrally formed, and the retaining protrusions 10 are press-fitted into the window hole 4 by the force of pushing the transparent window plate 7 into the window hole 4. It is formed in a shape that slightly protrudes from the end of the transparent window plate 7, and the retaining flange portions 9 and the retaining protrusions 10 are arranged alternately in the circumferential direction of the transparent window plate 7.

[Effect]

In such a case, simply force the transparent window plate 7 into the window hole 4 so that the retaining protrusion 10 is press-fitted into the window hole 4.
The window hole 4 is maintained in a state where it is prevented from coming out in the direction from the inside to the outside of the case, and bonding and welding steps are not required.

In addition, since the retaining flange portions 9 and the retaining protrusions 10 are arranged alternately in the circumferential direction of the transparent window plate 7, the window plate 7 can be molded without providing an undercut portion, and the molded metal Easy to mold and easy to mold.

〔Example〕

An embodiment of the tape cartridge according to the present invention will be described with reference to FIGS. 1 to 5.

In FIG. 3, 1 is a main body case of a tape cartridge, 2 is a hub rotatably arranged inside the main body case 1 on the left and right sides, and 3 is a tape wound around the hub 2.

The main body case is made of metal (aluminum alloy die-casting, etc.)
Alternatively, it is made of plastic, and has a rectangular window hole 4 in its negative part. As shown in FIG. 2 and FIG.
- 5 is formed in a shape that sinks lower than the outer surface of the case, and as shown in FIG. 1, slopes 6, 6 are formed on the inner side of the left and right hole edges 4b, 4b in a shape that spreads toward the inside of the case.

The transparent window plate 7 fitted into the window hole 4 is a plastic molded product such as polycarbonate, and as shown in FIG. 8, a retaining flange 9, which is attached to the front and rear ends of the window plate main body 8 at the half-thickness thereof so as to correspond to the window plate receiving surface 5; Board body 8
A retaining protrusion lO/IO having a substantially triangular cross section is provided at substantially the lower half of the thickness of the left and right ends of the plate so as to correspond to the slope 6.
It has the following. The amount of protrusion of the retaining protrusion 10 from the end of the window plate main body 8 is set to, for example, a slight amount of about Q, 4 am, so that the window plate main body 8 can be forcibly pushed into the window hole 4. The retaining protrusion 10 can be easily press-fitted into the window hole 4 through flexural deformation. Further, as shown in FIG. 5, the inclination angle C of the slope 6 and the inclination angle a of the slope 10a of the retaining protrusion 10 that engages with the slope 6 in surface contact are both about 30 degrees. It is set. Furthermore, a cut surface fob having an inclination angle of about 30 degrees is formed on the side opposite to the slope 10a of the retaining projection 10, so that the pushing action of the window plate 7 can be performed even more smoothly. .

When the transparent window plate 7 configured in this manner is pushed into the window hole 4 from the outside of the main body case 1 with a strong force, the window plate main body 8 is bent by this pushing force, and the left and right retaining protrusions 10 are bent.
・10 press-fits the left and right hole edges 4b, 4b of the window hole 4 while sliding inside the case and abuts and engages with the slopes 6, 6, and this abutment and engagement prevents the window plate 7 from being pulled out to the outside of the case. restricted from going out,
At the same time, the front and rear retaining flanges 9, 9 are brought into contact with the window plate receiving surfaces 5, 5 of the front and rear hole edges 4a, 4a of the window hole 4 in a surface contact manner, and the window plate 7 is moved inside the case. It is said that the prevention of removal of the
A state of fitting into the window hole 4 is obtained.

[Another example]

Instead of the above embodiment, as shown in FIG. 6, the retaining protrusions 10 of the transparent window plate 7 may be provided only at both end portions of the left end and right end of the window main body 8 in the front and back direction. Also,
The removal prevention collars 9,9 of the transparent window plate 7 are located at the left and right ends of the window plate main body 8,
Further, the retaining protrusions 10 may be attached to the front and rear ends of the window panel main body 8, respectively.In short, the retaining flange portions 9 and the retaining protrusions 10 may be attached alternately in the circumferential direction of the window panel 7. .

Further, the shape of the transparent window plate 7 and the window hole 4 may be other than a rectangular shape, for example, an elliptical shape or a polygonal shape of pentagon or more.

Furthermore, as shown in FIG. 7, while the inner and outer surfaces of the transparent window plate 7 are reversed, the window hole 4 is formed in a corresponding shape, and the transparent window plate 7 is inserted into the window hole 4 from the inside of the case. It may also be something that fits in.

In addition, in FIG. 2, the inner surface 9 of the retaining collar 9 of the transparent window plate
A can also be provided with various printed displays such as a tape winding amount display scale, a tape running direction display, or a decorative color.

〔Effect of the invention〕

In the tape cartridge of the present invention, a pair of retaining collar portions 9 and a retaining protrusion 10 are integrally formed at the end of the transparent window plate 7, and a pair of retaining flange portions 9 and a retaining protrusion 10 are integrally formed to restrict the retaining of the case in the inner and outer directions. The amount of protrusion from the end of the plate 7 is set to be small so that it can be forced into the window hole 4. therefore,
By forcibly pushing the transparent window plate 7 into the window hole 4 of the main case 1, a fitted state is obtained that does not come out from the inside or outside of the case, and it is different from conventional windows that require gluing and welding processes in addition to fitting. Compared to board mounting work, this work can be done easily and efficiently.

In particular, since the retaining flange portions 9 and the retaining protrusions IO are arranged alternately in the circumferential direction of the transparent window plate 7, the window plate 7 can be easily molded without providing an undercut portion, and the molding die can also be used. There is a great advantage in forming window panels that it can be easily done.

[Brief explanation of drawings]

1 to 5 show an embodiment of the tape cartridge according to the present invention, and FIG.
A sectional view taken along the line A; FIG. 2 is a sectional view taken along the line B-B in FIG. 3;
Figure 3 is a plan view of the entire tape cartridge, Figure 4 is a perspective view showing the separated state of the main body case and transparent window plate, and Figure 5 is a cross section showing the state before the transparent window plate is fitted into the window hole of the main body case. It is a diagram. FIG. 6 is a perspective view of a transparent window plate showing another embodiment of the present invention. FIG. 7 is a sectional view showing still another embodiment of the present invention. 1.. 4.. 7.. 9.. 10. ・Body case, ・Window hole, ・Transparent window plate, ・Removal prevention flange, ・Removal prevention protrusion. Figure 3 〆1 / Same inventor

Claims (1)

[Claims] (1) In a tape cartridge in which a plastic transparent window plate 7 is fitted into a window hole 4 that is opened in a part of the main body case 1, there is a tape on the edge of the transparent window plate 7 and on the inner and outer surfaces of the edge of the window hole 4. A pair of retaining flange portions 9 and retaining protrusions 10 are integrally formed to abut and engage to prevent the case from being removed in the inner and outer directions. It is formed in a shape that slightly protrudes from the edge of the transparent window plate 7 so that it can be press-fitted into the window hole 4 by the force of pushing it into the transparent window plate 7. A tape cartridge characterized in that: