JPH0525108Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The invention protects the magnetic tape by opening and closing the front opening, which serves as a tape path, with a lid.
In particular, the present invention relates to a tape cassette suitable for recording PCM signals.

[Summary of the idea]

The present invention is rotatably supported on a cassette case,
In a tape cassette that has a lid that opens and closes the front opening, the axes of the rotation axes of the pivots on both sides of the lid relative to the cassette cassette body are made different, thereby preventing the lid from being incorrectly attached to the cassette cassette body. This eliminates problems caused by vertically or horizontally asymmetric configurations and improves product yield.

[Conventional technology]

Conventionally, tape cassettes as shown in FIGS. 8 and 9 have been proposed as tape cassettes that accommodate magnetic tapes for recording PCM signals.

In FIG. 8, 1 generally indicates the case of a tape cassette for recording, for example, a PCM signal, and this cassette case 1 has an upper half 1a and a lower half 1b.
2a and 2b are reel hubs, 3 is a magnetic tape, and 4 is a lid provided on the front of the tape cassette, which in this figure is in a state where the front opening is closed. This lid 4 has a long plate-shaped lid portion 4a for closing the front opening of the tape cassette, and a shaft hole 5 for the rotation axis of the lid 4, which is bent from both ends of the lid portion 4a. It consists of a shaft support 4b. The lid 4 is made of a highly elastic plastic material, and by being curved toward the cassette case 1, it engages with the front opening of the cassette cassette 1 through elastic deformation, and remains stationary at a predetermined position to open the front opening. The area is closed. 6 indicates a rotation shaft portion of the lid 4;
The rotation shaft 6 is provided at a predetermined position on the cassette case 1.

Figure 9 also shows the lid 4 of the tape cassette in this example.
The magnetic tape 3 is shown exposed at the front opening of the tape cassette by rotating it open by hand or by an automatic device of a tape recorder.

Since the tape cassette of this example is provided with a lid 4, the front opening is closed by the lid 4 as shown in FIG. The magnetic tape 3 in the opening is protected from being touched by hands, etc., and dust and the like can be prevented from entering the tape cassette body.

[Problem that the invention attempts to solve]

In the tape cassette constructed in this way, the lid 4 is pivotally supported on the cassette cassette 1 by pivot shafts 6, 6 at both pivot supports 4b, 4b.
Since 6 has the same diameter, it is possible to assemble the lid 4 even in an inverted state, but if the lid 4 has a vertically or horizontally asymmetric configuration, it will be difficult to assemble it in an inverted state, resulting in a defective product. , there is a problem that the yield of the product decreases.

In view of this point, the present invention has a simple configuration,
An object of the present invention is to provide a tape cassette which prevents a lid from being erroneously attached to a cassette case.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a tape cassette having a lid which is rotatably supported on a cassette case and which opens and closes a front opening. The shaft diameters of the rotating shafts are made different from each other.

[Effect]

By making the shaft diameters of the rotating shafts on both sides, which pivotally support the lid on the cassette cassette body, different from each other in this way, the lid cannot be pivotally mounted in the reversed state with respect to the cassette cassette, that is, it cannot be attached incorrectly. This prevents erroneous attachment when the lid is vertically or horizontally asymmetrical.

〔Example〕

Hereinafter, an example of a tape cassette to which the present invention is applied will be explained with reference to FIGS.
The size is mm.

In the figure, reference numeral 11 generally indicates the case of a tape cassette that stores a magnetic tape for recording PCM signals, for example.This cassette case 11 has an upper half 11a and a lower half 11b facing each other, and has four screws 12a, 12b, A pair of reels 13a and 13b are formed by being tightened and combined by 12c and 12d.
The magnetic tape T wound around is stored.

An opening 14 is formed on the front side of the cassette case 11 over almost the entire surface, and this front opening 1
Rollers 15a and 15b are rotatably disposed on both sides of the front opening 14, and the space between the rollers 15a and 15b of the front opening 14 forms a tape path section for the magnetic tape T. ,15
b is wound around the reels 13a and 13b, and the upper and lower surfaces, that is, the upper and lower halves 11a and 1
Reel shaft insertion holes 16a and 16b are symmetrically formed in 1b and communicate with reels 13a and 13b, respectively.

A lid 17 for opening and closing the front opening 14 is attached to the front side of the cassette cassette 11, and the lid 17 is made of a highly elastic plastic material and corresponds to the front opening 14 of the cassette casing 11. a cover plate portion 17a, and a pivot arm portion 1 bent rearward from both ends of the cover plate portion 17a at right angles.
7b and 17c, and the lid plate part 17
a is biased toward the rear, that is, toward the inside of the cassette case 11.

In the tape cassette constructed in this way, both sides of the front opening 14 which serves as the tape path portion of the cassette case 11 have stepped portions 14 that are lower than the central portion.
a, 14b, and this both side stepped portions 14
Cutout recesses 14a 1 , 1 are formed on the upper and lower edges of a, 14b so that a part of the rollers 15a, _15b can be seen from the upper and lower surfaces.
4b ₁ , 14a ₂ , and 14b ₂ are formed. Further, guide pieces 18a and 18b are disposed inside the stepped portions 14a and 14b on both sides so as to bridge between the upper and lower edges.
Both side stepped portions 14a, 14 from the inside from a, 18b
Tapered surfaces 19a ₁ , 19b ₁ , 19a ₂ low in the b direction,
19b ₂ is formed.

Further, at both ends of both side surfaces of the cassette case body 11, stepped pivot supports extending across the upper and lower halves 11a and 11b correspond to the pivot arm portions 17b and 17c of the lid 17, and have a depth approximately equal to the wall thickness thereof. Surface portions 20a, 20b are formed, and shaft pins 21a, 21b are protruded from these shaft support surface portions 20a, 20b, so that shaft support arm portions 17b, 17c of the lid 17 are pivotally supported via shaft holes 22a, 22b. The lid 17 is rotated vertically relative to the cassette case 11 to open and close the front opening 14.

In the closed state of the front opening 14 of the lid 17, the lid plate portion 17a is located at the upper and lower edges of the front opening 14 on its inner side, that is, the upper and lower halves 11a, 11b.
It is configured to be elastically deformed and abutted against the front edge of the front edge of the front edge of the front edge of the front end of the front edge of the front end of the front edge of the front end of the front edge of the front end of the front edge of the front edge of the front edge of the front end of the front edge of the front edge of the front end of the front edge of the front edge of the front end of the front end of the front edge of the front edge of the front end of the front edge of the front edge of the front edge of the front edge of the front edge of the front edge of resistance of resistance of biasing force. In addition, in this closed state, both side pivot arm portions 17
b, 17c are biased inward due to the deformation of the cover plate portion 17a, and the shaft support surfaces 20a, 2 of the cassette case body 11
This both-side pivot arm part 1 is in contact with 0b.
The outer surfaces of 7b and 17c are located substantially on the same plane as both side surfaces of the cassette case 11. Further, in the middle of the opening operation, when the lid plate portion 17a is brought into contact with the upper edge or the lower edge of the opening of the cassette case 11, the lid plate portion 17a is elastically deformed most greatly and locked. This state, that is, the dead point position is reached, and by exceeding this position, the cover plate portion 17a is rotated upward or downward in the restored state to be opened, resulting in a so-called click operation. In this state, both side pivot arm parts 17b and 17c are connected to the cover plate part 17.
Since the biasing force from a does not act, the cassette case 1
The contact with the shaft support surfaces 20a and 20b of 1 is released, and a gap is created.

Therefore, in this example, when the lid 17 is in the open state, the projecting edge surfaces 20a ₁ and 20b ₁ , which are in contact with the inner surfaces of the both side pivot arm portions 17b and 17c, are attached to the cassette case 1.
The lid 17 protrudes from the shaft support surfaces 20a and 20b of the lid 17, and is configured to prevent sliding in the lateral direction in the open state. The projecting edge surfaces 20a ₁ and 20b ₁ are located at a portion separated from the both-side pivot arm portions 17b and 17c when the lid 17 is in the closed state and in its opening/closing operation state, and provide both-side pivot support due to the elastic deformation of the lid plate portion 17a. The arm portions 17b and 17c can be displaced without any trouble, and the lid 17 can be opened and closed reliably.

Further, both side pivot arm portions 17b, 17 of the lid 17
The rear half part c is formed as a fan-shaped surface that spreads forward from the periphery of the shaft holes 22a and 22b. On the other hand, the stopper edge surfaces 23a, 23b, on which the both-side pivot arm portions 17b, 17c of the pivot-support surface portions 20a, 20b of the cassette case 11 are locked in the open state, are moved to the rear half of the open position of the both-side pivot arm portions 17b, 17c. It is formed in a shape along the inclined side surface of the section, that is, in a symmetrical inclined surface shape vertically from the center, and the upper and lower ends are formed into vertical surfaces 23a ₁ and 23b ₁ . Therefore, the center portions of the stopper edge surfaces 23a, 23b are close to the end surfaces of the pivots of the both-side pivot arm portions 17b, 17c.

Further, the shaft support surfaces 20a, 2 of the cassette case 11
Double shaft pins 21a and 21 are respectively provided to protrude from 0b and pivotally support both side shaft support arm portions 17b and 17c of the lid 17.
b have different diameters and form tapered surfaces 21a ₁ and 21b ₁ on the end surfaces thereof that slope downwardly toward the front, and the shaft holes 22a and 22b into which the two shaft pins 21a and 21b are inserted are similarly shaped. The lid 17 for the cassette case 11 is formed with different hole diameters.
It is designed to prevent erroneous mounting in reverse during mounting.

A guide groove 24 is formed in the longitudinal direction on the front side of the cover plate portion 17a of the cover 17 at an asymmetrical position in the vertical direction. By engaging with the mating portions, each tape cassette can be inserted and stored with the A side and B side aligned. By forming this guide groove 24 on the lid 17, the strength of the cassette case 11 is not impaired, and especially in small tape cassettes, various detection parts disposed on the surface of the cassette case can be used.
There is no restriction on the display label attachment area.

Further, an engagement groove 25 is formed on the surface side of the cover plate portion 17a of the cover 17, and as described above, the latch mechanism disposed inside the magazine is engaged when the tape cassette is stored in the cassette magazine. It is designed to maintain its stored state. By forming this latch engagement groove 25 on the lid 17, the strength of the cassette case 11 is not impaired in this case as well, and especially for small tape cassettes, various detection units and display labels placed on the side of the cassette case can be attached. There are no restrictions on the department.

Further, on both sides of the lid 17, that is, on both end surfaces of the lid plate portion 17a, there are engaging recesses 26a, into which the engaging pins 42 of the lid opening/closing mechanism 41 provided in the tape cassette loading section of the recording/reproducing apparatus are engaged. 26b is formed, and when the tape cassette is inserted into the loading section with the lid 17 closed, the engaging recesses 26a and 26b are formed.
is engaged with the engagement pin 42, and in this state, the lid opening/closing mechanism 41 is rotationally driven, the lid 17 is rotated in the opening direction via the engagement pin 42, and the front opening 14 of the cassette case 11 is opened. be done.

In this way, the lid 17 is rotated, and the cassette case 1
With the front opening 14 of No. 1 open, the capstan 43 connects the roller 15a or 15b to the cutout recesses 14a ₁ , 14a ₂ or 14 on the upper and lower edges of the front opening 14.
b ₁ and 14b ₂ , but in order to prevent the tip of the capstan arm 44 from hitting the lid 17 in this example, the lid 17 is
A cutout recess 2 is provided at the corner between the front surface and the upper and lower edge surfaces of the lid plate portion 17a corresponding to the rollers 15a and 15b.
7a ₁ , 27a ₂ and 27b ₁ , 27b ₂ are formed to be spaced apart from the tip of the capstan arm 44. As a result, the capstan 43 reliably contacts the roller 15a or 15b, and the magnetic tape T can be stably run at a constant speed.

In addition, the upper half 1 of the cassette case 11 described above is
The screw holes 28a and 28b of the rear side screws 12a and 12b for joining and tightening the lower half 1a and the lower half 11b are located above the screw heads 12a ₁ and 12b ₁ , that is, the upper half 1
The cavities 28a ₁ and 28b ₁ are formed on the 1a side, and these cavities 28a ₁ and 28b ₁ can be used as various detected parts, for example, A side and B side detected parts. .

Various detected parts are located on the surfaces adjacent to the screw holes 28a and 28b and on the approximately central portion of the rear edge surface, respectively.
For example, the tape thickness detection hole 29, the preliminary detection hole 30, and the tape type selection/cassette presence/absence detection hole 3.
1. An accidental erasure prevention hole 32 is formed, and upper and lower halves 11a, 1 are formed at the rear of both sides of the cassette case 11.
A take-out grip 33 and a changer grip 34 are formed on 1b.

As described above, in this example, the cassette case 11
The shaft pin that pivotally supports the lid 17, that is, the cassette case 1
The lid 1 is provided protrudingly on both side shaft support surfaces 20a and 20b of the lid 1.
The shaft diameters of the two shaft pins 21a, 21b which pivotally support the both shaft support arm portions 17b, 17c of 7 are made different from each other, and the shaft diameters of both shaft support arm portions 17b, 1
Since the hole diameters of the shaft holes 22a and 22b of 7c are made different, it is possible to prevent a malfunction of reversal when attaching the lid 17 to the cassette case 11, and it is possible to store the tape cassette in the cassette magazine with side A and side B aligned, as in the tape cassette shown in the figure. If the lid 17 is configured vertically asymmetrically or horizontally asymmetrically as in the case where the lid 17 is configured to be vertically asymmetrical or horizontally asymmetrical, problems caused by incorrect attachment can be eliminated.

In this example, the shaft pins 21a and 21b are attached to the lid 1.
Protrudingly provided on both side pivot arm portions 17b and 17c of 7,
Both side shaft support surfaces 20a and 20b of the cassette case 11
The present invention is not limited to the above-described embodiments, for example, a shaft hole may be bored in the shaft hole, and various configurations may be adopted without departing from the gist of the present invention.

[Effect of idea]

As described above, according to the present invention, in a tape cassette that is rotatably supported on the cassette cassette and has a lid that opens and closes the front opening, the axial diameter of the rotating shaft of the pivot on both sides relative to the cassette cassette is adjusted. By making the lids different from each other, it is possible to prevent problems caused by incorrect attachment when the lid is formed vertically or horizontally asymmetrically, and to improve workability during assembly.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the tape cassette according to the present invention, Fig. 2 is a perspective view of the tape cassette with the lid open, Fig. 3 is a partially cutaway plan view of the tape cassette, and Fig. 4 is the same with the lid open. A side view of the state shown in Fig. 5 is A- of Fig. 4.
6 is an enlarged sectional view taken along the line B-B in FIG. 3, FIG. 7 is a perspective view of the tape cassette according to the present invention in use, and FIG. 8 is a perspective view of a conventional tape cassette. FIG. 9 is a perspective view of the same with the lid opened. In the figure, 11 is a cassette case, 14 is a front opening,
17 is a lid, 17b and 17c are pivot arm parts, 20
a and 20b are shaft support surfaces, 20a ₁ and 20b ₁ are projecting edge surfaces, and 21a and 21b are shaft pins.

Claims (1)

[Claims for Utility Model Registration] In a tape cassette having a lid which is rotatably supported on a cassette cassette body and which opens and closes a front opening, an axis of rotation of both sides of the lid with respect to the cassette cassette body; A tape cassette characterized by having different sutras.