JPH07169238A - Tape cassette - Google Patents

Abstract

PURPOSE:To prevent the dust intrusion and the deflection of a front cover in a tape cartridge provided with the front cover and rear cover opening/closing a pocket for the tape loading. CONSTITUTION:The lower end part 11b of the rear cover is arranged to enter the recessed part 35 of the front cover 9. A front cover receiving surface 36 is provided in the recessed state at the lower part of the front end side on a side wall 7 of the pocket 6. The end parts 35a of the recessed part 35 are formed so as to extend to the internal surface of the left/right sides of the lower end part 12b at the front surface of the front cover 9 which abuts on the front cover receiving surface 36, and an abutting ribs 37 are arranged in the end parts 35a. By this arrangement, the front cover 9 withstands satisfactorily against the external force applied from the front side in spite of providing the recessed part 35 therewith, then the deflection and damage are prevented, and the protection for a tape is secured, and also the molding problem about the generation of shrinks is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cartridge having a front lid and a back lid for opening and closing a tape loading pocket, and more particularly to an improved front lid structure.

[0002]

2. Description of the Related Art As a tape cartridge of this type,
For example, as shown in FIGS. 8 to 10, there is a tape cartridge for 8 mm video, in which the tape outlets 4 and 4 are provided on the left and right of the front surface side of the main body case 1.
A tape loading pocket 6 is provided between each of the four pockets 4, and the pocket 6 has a front lid 9 for covering the front side of the tape 2 and a back lid 11 for covering the back side of the tape 2. It is opened and closed by a heavy lid. The front lid 9 is a plastic molded product, and the front lower end portion 1 thereof
Notches 18 are provided on the left and right sides of 2b, and the notches 18 are placed on the lower edge 4a of the tape outlet 4 to prevent the front lid 9 from rotating further downward. Further, in the closed state, the cutout portion 18 of the front lower end portion 12b of the front lid 9
A recess 35 is provided on the inner surface between 18 in the left-right direction,
By allowing the lower end 11b of the back lid 11 to enter the recess 35, it is possible to prevent dust from entering from the location.

[0003]

However, the front lid 9 described above is not provided.
Since the strength is reduced by providing the concave portion 35,
As shown in FIG. 10, when an external force F is applied from the front side, the front lower end portion 12b of the front lid 9 is flexibly deformed toward the inside of the pocket 6 and is easily damaged, which is not preferable for protection of the tape 2. It was The object of the present invention is to improve the rigidity of the front lid while ensuring the prevention of dust intrusion from the back lid by improving the front lid structure in the tape cartridge including the front lid and the back lid as described above. This is to improve the reliability of the tape protection.

[0004]

The tape cartridge on which the present invention is based has, as shown in the drawing, a tape outlet 4 on the left and right of the front side of a main body case 1 containing a reel 3 around which a tape 2 is wound. 4, a tape loading pocket 6 is provided between the tape outlets 4 and 4, respectively. A front cover 9 made of plastic for opening and closing the front of the pocket 6 and the left and right tape outlets 4, 4 is attached to the main body case 1 with a rotating shaft 14.
It is supported so that it can be opened and rotated around. Inside the pocket 6, a back cover 11 covering the rear surface side of the tape 2 drawn out into the pocket 6 is interlocked with the upward opening rotation of the front cover 9, and is provided on the left and right side walls 7 in the pocket 6. It is provided so as to open and move diagonally upward toward the rear of the case along the groove 34. A concave portion 35 into which the lower end portion 11b of the back lid 11 is inserted is provided on the inner surface of the lower end portion 12b of the front surface of the front lid 9 in the left-right direction.

In addition, according to the present invention, the front lid 9 is in contact with the lower portions of the left and right side walls 7, 7 in the pocket 6 on the front end side thereof when the front lid 9 is in the closed state. The receiving surface 36 is recessed. The left and right end portions 35a of the recess 35 are formed to extend to the inner surfaces of the left and right ends of the front lower end portion 12b of the front lid 9, and the end portion 35 is formed.
A contact rib 37 is provided in a so that the contact rib 37 contacts the front lid receiving surface 36.

[0006]

In the closed state, even if an external force is applied to the front lid 9 from the front side, the left and right ends of the front lower end portion 12b of the front lid 9 are received and supported on the left and right front lid receiving surfaces 36. Deflection can be suppressed. For the purpose of preventing the bending only, it is preferable to secure the wall thickness of the portion without extending the concave portion 35 to the inner surfaces of the left and right ends of the front lower end portion 12b of the front lid 9, but in such a case. Since the front lower end portion 12b of the front lid 9 has a recessed portion 35 that is thin and a thick portion that does not have the recessed portion 35, and a thickness difference occurs, the surface of the thick portion is unsightly in appearance. There is a molding problem in that sink marks (depressions) occur. However, the concave portion 35 extends to the inner surfaces of the left and right ends of the front lower end portion 12b of the front lid 9.
If the end portion 35a is extended and the abutment rib 37 is provided in the end portion 35a, the lower end portion 12b can have a uniform wall thickness in the left-right direction and strength can be added. Therefore, it is possible to prevent the occurrence of sink marks, and it is possible to sufficiently counter the external force by the overlapping contact action of the front lid receiving surface 36 and the contact ribs 37, and to secure the deflection suppressing effect.

[0007]

1 to 7 show one embodiment of a tape cartridge according to the present invention. This tape cartridge is for a compact type video, and as shown in FIGS. 2 and 5, the main body case 1 is made by abutting the upper and lower cases 1a and 1b made of plastic, and the tape 2 is wound inside the case. A pair of left and right reels 3 are rotatably arranged. Tape 2 pulled out from one reel 3
Is guided by tape guides 5 provided at the front and left tape outlets 4, 4 of the main body case 1 and wound on the other reel 3. A tape loading pocket 6 is provided in the center of the front surface of the main body case 1, that is, between the left and right tape outlets 4. The upper and lower surfaces and front surface of the pocket 6 are open, the left and right side surfaces are closed by the left and right side walls 7 and 7 provided on the upper and lower cases 1a and 1b, and the rear surface is closed by the rear wall 8.

The lead-out portion 2a of the tape 2 led out into the pocket 6 is made of a plastic front lid 9 and upper lid 10 when not in use.
And a back cover 11 to cover and protect them. Front lid 9
As shown in FIGS. 3 and 5, the main face plate 12 that closes the front surfaces of the pocket 6 and the tape outlet 4 and the side face plate 13 that is integrally provided from the left and right ends of the main face plate 12 toward the rear of the case. Consists of. A rotary shaft 14 is provided on each inner surface of the left and right side plates 13, and the rotary shaft 14 is rotatably fitted into the shaft holes 16 of the left and right side walls 15, 15 of the main body case 1. As a result, the front lid 9 has the left and right tape outlets 4 and 4 and the pocket 6 as shown by the solid line in FIG.
Is openable and closable around the rotary shaft 14 between a position for closing the front surface of the and the upper open position shown by the two-dot chain line in FIG. The front lid 9 is always biased by a spring member 17 (see FIG. 5) formed of a torsion coil spring fitted to one of the left and right rotary shafts 14 to be freely closed. In the closed state of the front lid 9, as shown in FIG. 2, the notches 18 provided on the left and right ends of the lower end of the main face plate 12 are placed on the lower edge 4a of the tape outlet 4 and rotated downward. I try not to.

As shown in FIGS. 3 and 5, the upper lid 10 is provided continuously with a main face plate 19 which covers the upper surface of the pocket 6 so as to cover the upper portion of the lead-out portion 2a of the tape 2 and from left and right ends of the main face plate 19 downward. The left and right side plates 20, 20 are provided with slide shafts 21 on the inner surfaces of the rear ends of the left and right side plates 20, 20, respectively. This upper lid 10 is interlocked with the opening / closing operation of the front lid 9, and as shown by the solid line state in FIG. 3, a closed position for covering the upper surface of the pocket 6 and the stepped upper wall surface 22 of the upper case 1a, and two points in FIG. As shown by the chain line, the pocket 6 is openable and closable to the open position where it retracts to the rear of the upper surface of the pocket 6. Therefore, as shown in FIG. 5, the upper lid 10 is provided with a pair of left and right bifurcated arms 24, 24 having a pivot 23 at the left and right ends of the front end portion 19a of the main face plate 19, and as shown in FIG. The upper end portion 12a of the front lid 9 is sandwiched between 24, and the pivot shaft 23 is fitted into shaft holes 25 provided on the left and right end surfaces of the upper end portion 12a so as to be rotatably supported about the pivot shaft 23 (Fig. 3). Further, as shown in FIG. 3, the slide shaft 21 slidably engages with a "V" shaped guide groove 26 provided on each outer surface of the left and right side walls 15 of the body case 1.

As shown in FIG. 3, the back cover 11 has a closed position for covering the back side of the tape 2 in the pocket 6 as shown by the solid line in FIG. 3 when the front cover 9 and the upper cover 10 are opened and closed. As shown by the chain double-dashed line state, the pocket 6 is openable and closable to the open position where it overlaps with the lower side of the upper lid 10 in the open state behind the upper surface of the pocket 6. Therefore, as shown in FIG. 3 and FIG. 5, the back lid 11 is provided with the left and right bifurcated arms 27, 27 provided on the upper end portion 11a of the back lid 11 at the front and rear intermediate portions of the inner surface of the main face plate 19 of the top lid 10. While sandwiching the lid holding wall 28,
The pivot 30 provided on the bifurcated arms 27 is fitted into the shaft hole 31 provided at the end face of the back cover holding wall 28 so as to be pivotally connected to the upper cover 10 so as to be rotatable. Further, leg portions 32 are provided on the left and right of the lower rear surface of the back lid 11, and slide pins 33 provided on the left and right leg portions 32 are vertically recessed in the left and right side walls 7 and 7 in the pocket 6, respectively. It is slidably engaged with the guide groove 34 in the shape of "".

Therefore, when the front lid 9 is now opened and pivoted about the pivot shaft 14, the top lid 10 is guided by the guide groove 26 to move the slide shaft 21 toward the rear of the pocket, so that the front end portion 19 is moved.
The a is pushed backward from the upper surface of the pocket 6 while being inclined obliquely upward, and is moved rearwardly from the upper surface of the pocket 6. Along with the opening of the top lid 10, the back lid 11 guides the slide pin 33 upward and rearward by the guide groove 34, and is opened and moved so as to approach the lower side of the top lid 10 and overlap behind the upper surface of the pocket 6. (See the state of the two-dot chain line in FIG. 3).

As shown in FIGS. 3 and 4, the back lid 11 in this closed state has its lower end portion 11b extended below the lead-out portion 2a of the tape 2 so that the front lid 9 is closed.
Left and right cutouts 18 in the lower end 12b of the main face plate 12 of
.Recesses 35 provided in the left-right direction on the inner surface side between 18
Try to get in. Thereby, the lower end portion 12 of the front lid 9
Dust is prevented from entering the tape 2 and adhering to the tape 2 from the joining portion of the back cover 11 and the lower end 11b of the back lid 11.

As shown in FIGS. 1 and 6, the lower portions of the left and right side walls 7, 7 in the pocket 6 on the front end side, that is, the ends of the lower edge 4a of the tape outlet 4 on the pocket 6 side. Front lid receiving surfaces 36 are provided in the respective portions so that the inner surfaces of the left and right ends of the lower end portion 12b of the main face plate 12 of these front lid receiving surfaces 36, 36 contact the left and right front lid receiving surfaces 36. To As a result, the main face plate 12 of the front lid 9 is
Even when the strength is reduced by 5 and an external force is applied from the front side, the left and right ends of the lower end portion 12b of the main face plate 12 are received and supported on the left and right front lid receiving surfaces 36, 36. , The main face plate 12 that can sufficiently oppose the external force
It is possible to prevent flexural deformation of the lower end portion 12b.

In this case, the sectional shape of the left and right ends of the lower end portion 12b of the front lid 9 that abuts the left and right front lid receiving surfaces 36 is the recess 35.
If the front cover 9 is left in a thick state without being provided, a sink mark is generated in the thick portion of the front lid 9 during plastic molding, which is not preferable in appearance. Therefore, as a cross section of the left and right ends of the lower end portion 12b of the front lid 9, the front lid abutting against the front lid receiving surface 36 as shown in FIGS. The left and right end portions 35a of the recessed portion 35 are formed to extend to the inner surfaces of the left and right ends of the lower end portion 12b of 9, and a contact rib 37 is provided in the end portion 35a. Abut on the lid receiving surface 36. As a result, the wall thickness of the lower end portion 12b can be made as uniform as possible in the left-right direction, and the occurrence of sink marks can be prevented.

[0015]

As described above, according to the present invention, the lower end portion 11b of the back lid 11 is inserted into the recess 35 of the front lid 9 so that dust can be prevented from entering from the location.
Not only that, the front lid receiving surface 36 is provided in the lower portion of the side wall 7 of the pocket 6 on the front end side, and the front lid lower surface 12b of the front lid 9 that contacts the front lid receiving surface 36 is recessed to the inner surface at the left and right ends. Three
5 is formed by extending the end portion 35a of
A contact rib 37 is provided in a. Therefore, even though the front lid 9 has the concave portion 35, it can sufficiently oppose the external force applied from the front side thereof to prevent bending, damage, tape protection, and molding problems such as sink marks. Is also advantageous because it can be eliminated.

[Brief description of drawings]

1 is a sectional view taken along line BB in FIG.

FIG. 2 is a perspective view of the entire appearance.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is an overall bottom view.

FIG. 5 is an exploded perspective view showing a front lid, an upper lid and a back lid separated from each other.

FIG. 6 is a perspective view of a side wall of a pocket.

FIG. 7 is a perspective view of a part of the front lid.

FIG. 8 is a cross-sectional view of a main part of a conventional tape cartridge.

FIG. 9 is an external perspective view of a conventional tape cartridge.

FIG. 10 is a bottom view of a conventional tape cartridge.

[Explanation of symbols]

 1 Main body case 2 Tape 3 Reel 4 Tape outlet 6 Pocket 7 Pocket side wall 9 Front lid 11 Back lid 14 Rotating shaft 35 Recessed portion 36 Front lid receiving surface 37 Contact rib

Claims (1)

[Claims] 1. Tape outlets 4, 4 are provided on the left and right of the front side of a main body case 1 containing a reel 3 around which a tape 2 is wound.
Pockets 6 for tape loading are provided between the tape outlets 4 and 4, respectively, and a pocket 6 and a plastic front lid 9 for opening and closing the front surfaces of the left and right tape outlets 4 and 4 are rotated to the main body case 1. It is supported rotatably upward about the shaft 14, and in the pocket 6, a back lid 11 covering the rear surface side of the tape 2 drawn out in the pocket 6 is interlocked with the upward opening rotation of the front lid 9. It is provided so as to open and move diagonally upward toward the rear of the case along the guide grooves 34 provided on the left and right side walls 7 in the pocket 6, and on the inner surface of the front lower end 12b of the front lid 9, In the tape cartridge in which the recessed portion 35 into which the lower end portion 11b of the back lid 11 is inserted is provided in the left-right direction, in the lower portion on the front end side of each of the left and right side walls 7 in the pocket 6,
When the front lid 9 is in the closed state, the front lid receiving surface 36 with which the inner surfaces of the left and right ends of the front lower end 12b of the front lid 9 abut is recessed. The left and right ends 35a of the recesses 35 are formed to be extended, and a contact rib 37 is provided in the end 35a so that the contact rib 37 contacts the front lid receiving surface 36. Characteristic tape cartridge.