JP2811598B2 - Tape cartridge - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading type tape cartridge such as a video tape cartridge and the like, and relates to an improvement in a front cover for protecting a tape mounted on a front surface thereof.

[Conventional technology]

As such a tape cartridge, for example, the one shown in FIGS. 5 and 6 is known. In this case, a reel 3 on which a tape 2 is wound is built in the left and right inside of the main body case 1 formed by abutting upper and lower cases 1a and 1b made of plastic. Tape loading pockets 5 are opened at the left and right centers between the outlets 4, and a tape guide member 6 having a cylindrical or cylindrical cross section is provided upright on the pocket 5 side of each tape outlet 4. Then, the tape 2 passes through the left and right tape pull-out ports 4 and the tape guide member 6
And is led out from one of the reels 3 to the front surface of the main body case 1 and wound up on the other reel 3. Further, a plastic front lid 7 that opens and closes a tape outlet 4 and a front surface of an opening of a pocket 5 is attached to the main body case 1 so as to be rotatable around a shaft 9.

When this tape cartridge is loaded into the video tape recorder, the front lid 7 is opened upward around the axis 9 by the lid opening member on the recorder side, and the tape guide pin and the tape pull-out pin on the recorder side are located below the pocket 5 from below. After insertion, the tape 2 is pulled out to the front of the case and wound around the rotary head on the recorder side.

In order to facilitate the tape pull-out by such a recorder, the tape cartridge has a structure in which a tape pull-out guide area of the recorder is secured. That is, as shown in FIG.
Is set at a position deviated rearward from the circumferential front portion 6a of the tape guide member 6. In other words, the upper end 6b of the circumferential front portion 6a of the tape guide member 6 is formed so as to be exposed forward of the case from the front end of the opening upper edge 4a of the tape outlet 4. By doing so, for example, as shown in FIG. 7, when the tape is pulled out, the tape guide pin 11 on the recorder side can be used.
Although the tape 2 is slightly tilted as indicated by a two-dot chain line due to the tape tension due to variations in manufacturing accuracy and the like, even if the tape 2 is moved upward, the upper end edge of the tape 2 slides on the opening upper edge 4a and is damaged. I try not to be.

In addition, a tape cartridge having the shape of the tape outlet 4 and the tape guide 6 for such a purpose is also known as an 8-mm video tape cartridge disclosed in Japanese Patent Publication No. 63-39997. .

[Problems to be solved by the invention]

In order to reduce the size of the tape cartridge, it is desirable that the front lid 7 be provided as close as possible to the lead-out portion of the tape 2 led out to the front surface of the case.

However, in the above-mentioned conventional example, when the front cover 7 is arranged as close as possible to the lead-out portion of the tape 2, when the front cover 7 opens and closes, as shown in FIG. 7 axis 9
The point P on the extension line passing through the rotation center O of the tape guide member 6 and the upper end 6b of the circumferential front portion 6a of the tape guide member 6 are very close to each other. For this reason, when the front cover 7 is deformed inward due to warpage or external force, the front cover 7
The tape guide member 6 may cut off the inner surface of the front lid 7 to generate shavings, which may adhere to the tape 2. Had occurred.

In order to avoid such contact interference between the inner surface of the front cover 7 and the tape guide member 4, the distance e between the front cover 7 and the tape guide member 6 may be increased. Cannot be achieved. Further, if the thickness of the entire front cover 7 is reduced, the distance between the front cover 7 and the tape guide member 4 can be increased accordingly. However, there is a limit in strength, and conversely, there is a problem that deformation is easily caused.

The present invention has been made in view of the above points, and can reduce the size of the tape cartridge, secure the strength of the front cover, prevent damage to the tape, and avoid contact interference between the front cover and the tape guide member. The purpose is to do.

[Means for solving the problem]

That is, in the tape cartridge of the present invention, the tape outlets 4 are provided on the left and right sides of the front surface of the main body case 1 and the center for the tape loading between the tape outlets 4 is provided in the same manner as the above-described conventional example. Each of the pockets 5 is opened, and a tape guide member 6 is erected on the pocket 5 side of the tape outlet 4, and the upper edge 4 a of the opening of the tape outlet 4 is located behind the circumferential front portion 6 a of the tape guide member 6. It is assumed that the front cover 7 is set so as to be biased, and the main case 1 is further provided with a front lid 7 for opening and closing the tape outlet 4 and the pocket 5 so as to be rotatable around an axis 9.

In addition, in the present invention, a concave portion 10 having an arc-shaped or V-shaped cross section for avoiding contact interference with the circumferential front portion 6a of the tape guide member 4 is provided on a portion of the inner surface of the front lid 7 facing the tape guide member 4. Is provided.

[Action]

When the tape 2 is pulled out to the front of the case by the video tape recorder, even if the tape 2 is shifted upward as shown in FIG.
4a is located at a position deviated rearward from the circumferential front portion 6a of the tape guide member 6, so that the tape 2 can be prevented from contacting the upper edge 4a of the opening.

Even if the front cover 7 and the tape guide member 6 are arranged close to each other, the distance e between the front cover 7 and the tape guide member 6 can be sufficiently ensured by the presence of the concave portion 10. 6 does not interfere with the upper end 6b of the front part 6a of the circumference.

When the cross-sectional shape of the concave portion 10 is arc-shaped or V-shaped, the flowability of the resin becomes better when the front lid 7 is injection-molded than when the cross-sectional shape of the concave portion 10 is square.

〔The invention's effect〕

According to the present invention, in order to secure a tape pull-out guide area, the upper edge 4a of the opening of the tape pull-out port 4 is set at a position offset more rearward than the circumferential front portion 6a of the tape guide member 6,
Further, the front cover 7 and the tape guide member 6 are arranged close to each other in order to achieve compactness. In such a case, a concave portion 10 is provided in a portion of the inner surface of the front cover 7 facing the tape guide member 4, and the front cover 7 is provided. When the tape guide member 6 is opened and closed
This is advantageous because it can be prevented from interfering with the contact, so that it can be opened and closed smoothly and the generation of shavings can be prevented. Further, since the concave portion 10 is partially provided in the front lid 7, the strength can be ensured. Further, since the concave portion 10 is formed in an arc-shaped or V-shaped cross section, the resin has excellent fluidity even when the front lid 7 is injection-molded.

〔Example〕

One embodiment of the present invention will be described with reference to FIG. 1 and FIG.

Basic configuration of tape cartridge, tape outlet 4
Since the tape guide member 6 is the same as the conventional one described above, the same reference numerals are given and the description thereof is omitted, and only the points different from the conventional front lid 7 will be described.

In the front lid 7, only a portion of the inner surface thereof facing the tape guide member 6 is recessed to form a recess 10. The recess 10 has an arc-shaped cross section and is formed in the vertical direction on the inner surface of the vertical wall of the front lid 7.

When the front cover 7 is formed in this manner, the distance e from the tape guide member 6 when the front cover 7 is opened and closed can be sufficiently ensured, and the strength of the front cover 7 can be substantially maintained. In addition, since the concave portion 10 has an arc-shaped cross section, the resin is more excellent in fluidity than the square cross-sectional shape when the front lid 7 is injection-molded, which is advantageous.

(Another embodiment)

As shown in FIG. 3, even if the cross-sectional shape of the concave portion 10 is formed in a “V” shape, the same effect as in the case of the arc-shaped cross section can be expected.

Further, as shown in FIG. 4, the recess 10 is not formed on the entire inner surface of the vertical wall of the front cover 7 in the vertical direction, but also interferes with the upper end 6b of the tape guide member 6 in the vertical direction of the inner surface. May be formed only in a portion that is particularly effective in avoiding the problem. In this case, it is more advantageous in securing the strength of the front lid 7.

It should be noted that the tape guide member 6 may be formed separately from the inner surface of the main body case 1 and may be vertically installed separately.

[Brief description of the drawings]

1 and 2 show an embodiment of the tape cartridge according to the present invention. FIG. 1 is a longitudinal sectional side view of a main part, and FIG. 2 is an enlarged sectional view taken along line II-II in FIG. is there. FIG. 3 is a sectional view showing another embodiment of the present invention, corresponding to FIG. FIG. 4 is a vertical sectional side view of a front lid showing still another embodiment of the present invention. 5 to 7 show a conventional tape cartridge, FIG. 5 is a perspective view showing the front cover with a half open state, and FIG. 6 is a longitudinal sectional side view of a main part showing the front cover with a closed state. FIG. 7 is a vertical sectional side view schematically showing a tape withdrawn state. 1 ... body case, 2 ... tape, 4 ... tape outlet, 4a ... upper edge of opening, 5 ... pocket, 6 ... tape guide member, 7 ... front lid, 9 ... shaft, 10 ... ... recesses.

Claims (2)

(57) [Claims] A tape outlet (4) is opened at the left and right of the front surface of the main body case (1), and a tape loading pocket (5) is opened at the center between the tape outlets (4.4). A tape guide member (6) is provided upright on the pocket (5) side of each tape outlet (4), and the front end of the upper edge (4a) of the opening of each tape outlet (4) is a tape guide. The main body case (1) is configured to open and close the tape outlet (4) and the pocket (5) so as to be located on the rear side of the circumferential front part (6a) of the member (6). In a tape cartridge having a front cover (7) rotatably mounted around a shaft (9), a tape guide member (6) is provided on a portion of the inner surface of the front cover (7) facing the tape guide member (6). With a recess (10) to avoid contact interference with the front part (6a) Tape cartridge characterized by Rukoto. 2. The tape cartridge according to claim 1, wherein the cross-sectional shape of the concave portion for avoiding contact interference is an arc or a V-shape.