JPH0810898Y2 - Magnetic tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a magnetic tape cassette used in a video recorder, a tape recorder, etc. It relates to a tape cassette.

[Conventional technology]

Conventionally, in a tape cassette used for a video tape recorder, a front lid, which is a dust cover, which is a lid, which is freely opened and closed, is axially dominated by an opening in the front face of the cassette case. In response to this, the opening is closed and the magnetic tape is protected from the front side so that dust may enter the case through the opening on the front side of the case, or the tape may be accidentally touched and scratched during handling. It is known that the front lid is configured to be locked so that it is not attached with a gusset, fingerprints, oil adhesion or the like.

In this conventional magnetic tape cassette, as shown in FIG. 5, a torsion spring a is used as a spring member for urging the front lid of the case in a closing direction, and a support shaft c protruding from the front lid b is used.
One end a ₁ of the spring is abutted against a spring receiving portion (not shown) provided on the side wall of the case, and the other end a ₂ is a hook-like engaging portion protruding from the front lid b. It is supported by d.

[Problems to be solved by the device]

However, with this conventional torsion spring, the assembly is complicated and it is difficult to take space for spring assembly, and the protrusion of the supporting portion is complicated, and the other end of the torsion spring is pushed into the supporting portion when operating. There is a problem that occurs, and there is a problem that this tip of the torsion spring is exposed at one end of the support side, it is easy to accidentally contact the tape, and the spring assembly is complicated and workability is poor and it is not practical. .

The present invention is intended to easily eliminate these conventional defects, and the movement range of the tip of the torsion spring supported by the front lid is within the insertion hole and does not project to the magnetic tape side.
The tape is always stored safely, and it prevents contact with the tape stored in the case. In addition, the inner wall of the case can be used as a guide to lock the spring. It is an object of the present invention to provide a magnetic tape cassette which is capable of greatly improving productivity and which has a simple structure and is inexpensive.

[Means for solving the problem]

The present invention is directed to a case for containing a magnetic tape, a front lid that protects the magnetic tape stretched over the front surface of the case, and has a front surface of the case that can be opened and closed, and urges the front lid in a closing direction. The spring member is a torsion spring inserted into a support shaft projecting from the front lid, one end of which is brought into contact with a spring receiving portion provided on the side wall of the case. In a magnetic tape cassette whose end is supported by a locking portion formed on the front lid, the other end of the torsion spring is a bent piece bent outward, and an insertion hole into which the bent piece can be fitted is inserted. The magnetic tape cassette is characterized in that a recess is provided as a locking portion on the support shaft projecting surface of the side wall of the front lid.

[Action]

In this magnetic tape cassette, the front lid 2 closes the front surface of the case 1 during storage, the magnetic tape is protected by the front lid 2, and the front lid 2 is biased in the closing direction by a torsion spring. It is possible to hold the magnetic tape in the case safely because the magnetic tape 2 is held so as not to open unexpectedly.
Also, when the front lid 2 is opened, the protrusion 14 of the lock lever is pushed to release the lock, and the spring member 3 of the torsion blade is
Since the bent piece 3 ₃ at the other end 3 ₂ is fitted into the insertion hole 6 ₁ of the spring engaging portion 6 even if the flexure of the spring is reached, the tip of the torsion spring moves inside the insertion hole 6 _{1 to} contact the tape. Can be easily prevented, and moreover, the spring member 3 is inserted into the support shaft 4 so that the bent portion 3 _{3 of the} torsion spring is naturally formed because the insertion hole 6 ₁ is formed in the inserting direction, that is, in the protruding surface of the support shaft. It is tentatively supported, and when the front lid 2 is assembled into the bearing portion 11 of the case 1, the inner wall of the case can be locked as a guide, which allows a large space for spring assembly, which simplifies the assembly work and greatly improves productivity. The product value can be significantly improved.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 4. A pair of winding reels around which a magnetic tape is wound is rotatably provided in a case 1. The case 1 includes an upper case and a lower case. A front lid 2 that protects the magnetic tape stretched over the front surface of the case 1 and that can open and close the front surface of the case 1, and a spring member 3 for the front lid that urges the front lid 2 in the closing direction. , A magnetic tape cassette provided with a lock lever (not shown) for maintaining the closed position of the front lid 2, the spring member 3 being a torsion member inserted into a spindle 4 projecting from the front lid 2. in the spring, the magnetic tape one end 3 ₁ into contact with the spring receiving portion 5 provided on the case side wall, the other end 3 ₂ of the torsion spring is Kakari支the engaging portion 6 formed on the front cover 2 in cassette, the bent piece 3 ₃ is bent to the other end 3 ₂ of the torsion spring on the outside, the bending flap 3 ₃ Insert can fit inserted hole ₆₁ the locking part 6
As a magnetic tape cassette, the side wall of the front lid 2 is concavely arranged on the surface of the support shaft 4 protruding from the side wall.

In this case, the as insertion holes _61, the front be those provided in the bracket 2 ₁ provided with a support shaft which protrude to the side of the lid 2, near the boundary between the bracket 2 ₁ a front cover 2 in the position, there is a window hole which is penetrating in a direction parallel to the support shaft 4, the outer surface is closed instead of the window opening as required, the recess distal end surface of the bent piece 3 ₃ does not abut it may be the insertion hole _61.

Incidentally, the bent piece 3 ₃ insertion hole ₆₁ in the depth dimension than in contact with the tip protruding or or walls bent at short dimension grinding dust is are aware that this does not occur.

Further, the protrusion 14 is slidably provided so as to protrude from a window hole formed in the side wall of the upper case, and is rotated by a lock lever to be released from the front cover 2 so as to be unlocked. .

Then, when the case 1 is loaded on the apparatus side, the front lid 2 is unlocked, and then the front lid 2 is mechanically operated to be opened against the spring member 3 so as to be in front of the magnetic tape. Front lid 2
By doing so, predetermined recording or reproduction can be performed, and the operational safety of opening and closing the front lid is improved without the tip of the torsion spring coming into contact with the tape.

In the figure, 10 is a guide groove provided on the outer surface of the case. 14 is a protrusion for locking operation, and 15 is a tape reel for preventing idling.

The upper case and the lower case of the case 1 are screw-coupled to each other, and the passage of the accommodated magnetic tape crosses the front side of the front side opening of the recess defined by the partition wall. The front cover 2 covering the front surface covers and protects the tape.

[Effect of device]

According to the present invention, the spring member is a torsion spring inserted into a support shaft projecting from the front lid, one end of which is brought into contact with a spring receiving portion provided on the side wall of the case, and the other end of the torsion spring is attached to the front lid. In the magnetic tape cassette supported by the engaging portion formed in the above, the other end of the torsion spring is a bent piece that is bent outward, and the insertion hole into which the bent piece can be inserted is used as the engaging portion. By arranging concavely on the protruding surface of the support shaft 4 on the side wall of the front lid, the conventional drawbacks can be easily eliminated, and the tip of the torsion spring supported by the front lid is safely protected and protrudes to the tape side. The tape contact can be prevented without fail, and the space for assembling the torsion spring can be made large, which greatly facilitates the workability and can be provided in a simple and inexpensive form. Spring can be locked with the wall as a guide Te, eliminating the inconvenience occurring on the operation, in which it is possible to increase significantly even the commercial value significantly improved productivity.

[Brief description of drawings]

1 is a perspective view of the whole, FIG. 2 is a side view in a separated state before assembling a front lid, FIG. 3 is a side view in an assembled state, and FIG. 4 is a partially cutaway view showing the inside. FIG. 5 is an enlarged perspective view of FIG. 5, and FIG. 5 is a perspective view showing the inside by cutting out a part of the conventional example. 1 …… Case, 2 …… Front lid, 2 ₁ …… Bracket, 3 ……
Spring member for front lid, 3 ₁ ...... one end, 3 ₂ ...... other end, 3 ₃ ...... bent piece, 4 …… support shaft, 5 …… spring receiving part, 6 …… engaging support part, 6 ₁ ……
… Insertion hole.

Claims (2)

[Scope of utility model registration request] 1. A case 1 for accommodating a magnetic tape, a front lid 2 for protecting the magnetic tape stretched on the front surface of the case 1, and a front lid 2 provided on the front surface of the case 1 so as to be openable and closable, and the front lid 2
And a spring member 3 for urging the spring member 3 in a closing direction. The spring member 3 is a torsion spring inserted into a support shaft 4 projecting from the front lid 2 and one end of which is a spring bearing provided on a side wall of the case 1. part 5 is in contact, also in the magnetic tape cassette is Kakari支the locking portion 6 and the other end of the torsion spring that is formed before the lid 2, bent to the other end 3 ₂ of the torsion spring 3 to the outside Bent pieces
3 ₃ and then, magnetic tape cassettes, characterized in that recessed deployed on the supporting shaft 4 projecting surface of the front cover 2 the insertion holes ₆₁ that can fitted to the bent piece 3 ₃ as a locking portion. 2. The insertion hole 6 ₁ is provided in a bracket 2 ₁ provided with a support shaft 4 projecting from a side surface of the front lid 2, and the bracket 2 ₁ and the front lid 2 are connected to each other. 2. A window hole that penetrates in a direction parallel to the support shaft 4 at a position near the boundary.
The magnetic tape cassette described.