JPS59168978A - Tape cassette - Google Patents

Abstract

PURPOSE:To fit an upper half onto a lower half easily and accurately together with a front cover without a positional shift by fitting the front cover onto the lower half in the state, where the front cover is fixed temporarily on the upper half, to make it difficult that the front cover and the upper half are separated from each other at the fitting time. CONSTITUTION:A pair of recessed parts 41 fitting a pair of fulcrum pins 15 of the front cover 4 is provided in the left and the right of an upper half 1, and a projection 26 which detains front end part 25b of a torsion coil spring 25 and a projection 33 for fixing temporarily a rear end part 25c are provided before and after the fulcrum pins 15. A coil part 25a is inserted to the outside circumferences of the fulcrum pins 15, and the fulcrum pins 15 are fitted into a pair of recessed parts 41 in the state where both of front and rear end parts 25b and 25c are engaged with the detaining projection 26 and the temporarily fixing projection 33 respectively, and a rear end part 25e is inserted into an upper slit 44, and the rear end part 25c is engaged with the temporarily fixing projection 33, and the upper half is fitted onto a lower half 2, and then, the rear end part 25e is brought into contact with a prescribed contacting part of the lower half 2. Thus, a cassette box body is assembled easily and accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape cassette that is most suitable for application to a recording/reproducing device such as a video tape recorder, and is particularly composed of an upper half and a lower half. A cassette housing in which the stored tape is bussed along the front opening;
The front cover has a square-shaped planar shape and is provided with a pair of fulcrum bins on the inside of both left and right ends. The front cover is rotatably supported on the left and right side walls of the cassette case; a torsion coil spring which is inserted into the outer periphery of the fulcrum bottle through its coil portion, and whose both ends are respectively latched to the front lid and the cassette casing to bias the front lid to rotate in the direction of closing the lid; It concerns a tape cassette.

Background Art and Problems The conventional method of assembling the cassette casing of this type of tape cassette is to insert a torsion coil spring around the outer periphery of the 10,000 fulcrum pin in the front cover.

The pair of fulcrums of the front lid are the sushi tetsugu on the lower edge of the left and right side walls of the upper half, and the upper half is fitted together with the front lid onto the lower half, and these upper and lower halves are fixed together with screws, etc. The method was to combine them.

However, in this method, the upper half and the front lid are fitted onto the lower half without mechanically temporarily securing the upper half and the front lid, so the upper half and the front lid separate when they are fitted. The upper half and the front lid were easily displaced from the lower half in both the front, rear, left, and right directions.In particular, when the front lid is subjected to rotational force in the closing direction when the cassette case is assembled, In order to do this, it is necessary to apply so-called initial stress by twisting the torsion coil spring to a certain degree.And in order to do this, when the upper half and front cover are fitted onto the lower half, the torsion coil spring There is no need for the rear end of the torsion coil spring to be brought into contact with the predetermined abutment part on the lower half side against elasticity. It is extremely difficult to make contact with the cassette case, and as a result, assembling the cassette case is extremely troublesome.Also, in this conventional method, an automatic assembly machine is introduced to automatically assemble the cassette case. There are some things that are difficult to do.

OBJECTS OF THE INVENTION The present invention seeks to provide a tape cassette capable of correcting the above-mentioned defects.

Summary of the invention The present invention relates to the above-mentioned tape cassette.

A pair of recesses into which the pair of fulcrum pins of the front lid fit are provided at the lower end edges of the left and right side walls of the upper half.

A locking protrusion at the front end of the torsion coil spring and a temporary fixing protrusion at the rear end of the torsion coil spring are provided on both front and rear sides of the fulcrum bottle inside the 10,000mm end of the front cover, and a locking protrusion at the rear end of the torsion coil spring is provided. The side wall of the coil spring has a slit for inserting the rear end of the torsion coil spring, and a temporary fixing protrusion for temporarily fixing the rear end inserted into the slit. With both front and rear ends of the torsion coil spring inserted into the outer periphery of the fulcrum bottle being respectively locked to the locking protrusion and the temporary fixing protrusion of the front cover, the pair of fulcrum bottles of the front cover are Fit into the pair of recesses in the upper half.

In this state, the rear end portion of the torsion coil spring is inserted into the slit of the upper half against the elastic force, and the rear end portion is engaged with the temporary fixing protrusion of the upper half. By fitting the upper half onto the lower half, the rear end of the torsion coil spring, whose position is regulated within the slit, is elastically pushed onto a predetermined contact portion on the lower half side. This tape cassette is constructed so that it can be brought into contact with the tape cassette, and the cassette case can be assembled extremely easily and accurately.

Embodiments Hereinafter, embodiments in which the present invention is applied to a tape cassette for a video tape recorder will be explained based on the drawings.

First, the overall structure of the tape cassette will be explained with reference to FIGS. 1 to 4.

First, as shown in FIG. The magnetic tape +81 wound on a pair of reels +61 and +71 is housed in the upper and lower halves (11(2)), and these upper and lower halves (II f2) are fitted into each other from above and below and connected together with a plurality of screws. A cassette housing (3) is configured.A front opening (101) is provided at the front of the cassette housing (3) over the entire length in the right direction, and the front opening (110) The magnetic tape (8+ is shown in FIGS. 2 and 4) is guided by a pair of tape guides aυ integrally molded inside the cassette housing (3) near the left and right ends (the front opening (101) In addition, the cassette housing (3) has a recess σ2 formed on the rear side of the front opening (101) inside the pair of tape guides +11+, and this recess PJTllI21
The planar shape is integrally molded inside the cassette housing (3) and is separated from the housing side of both reels f61 and +77 inside the cassette housing (3) by a Y-shaped partition wall. . Note that both the top and bottom of this recess &[121 are open.

Next, as shown in Fig. 1, the front cover +41 has a rectangular planar shape, and inside the left and right ends (4a), a pair of fulcrum bins (151) are integrally molded in the same line shape. As shown in Figures 2 to 4, the front cover (4
) covers the front side of the magnetic tape (8) that is being bussed along the front opening (10) (and its pair of fulcrum bins U5
A pair of bin insertion holes (
161, and this front cover (41
is attached to the cassette housing (3) so as to be able to rotate up and down around both fulcrum bins (151).

Next, on the rear M (51), as shown in FIG.
] At both left and right edges of the vertical center fM3vc, a pair of fulcrum pins are integrally molded so as to be on the same axis. As shown in FIGS. 2 and 4, the rear M (5+ is the magnetic tape t bused along the front opening f101)
The rear side of the 81 is placed in a recess (121) in parallel with the front lid (4). As shown in Figure 4, there are a pair of protrusions integrally molded near the left and right ends (4a) on the rear surface of the front cover (4) (inserted into the pair of bottle insertion holes in L9J from the inside). Then, after this, cover (5)
is attached to the front lid (4) at 5 so that it can rotate up and down around both fulcrum bins a. The upper lid aη is arranged on the upper surface II (concave P9r) as shown in FIGS. 2 and 4.

Next, as shown in FIGS. 1 and 2, the left and right ends (113a) of the old partition wall are opposed in parallel from the left and right, and the opposing surfaces of the left and right ends (13a) have a yS shape. A pair of gently curved guide grooves is provided between the guide grooves. The upper ends (21a) of both guide grooves t2D are open upward. A pair of protrusions are integrally molded on the rear surface of both left and right edges of the rear N (51) below both fulcrum pins, and both protrusions (221 are integrally molded on the outside of the same axis). A pair of broken guided pins ρ3) are loosely fitted into both guide grooves. In addition, as shown in FIGS. 2 and 3 (-- the outer periphery of the fulcrum bottle (15) and the front cover (4)--
(4a) and one side wall (31) of the housing (31)
A torsion coil spring +251 is wound between the torsion coil spring (25) and the front end (25b) of the torsion coil spring (25).
) is inside one end (4a) of the front cover (4) and has a spring locking protrusion 1 integrally molded at the front position of the fulcrum bottle (151).
26) Pressed up. In addition, as shown in FIGS. 1 and 3 (one side wall n of the cassette casing (31)
A lock lever (2 to 2) is attached to a) so as to be rotatable in the front and back direction. A fulcrum pin c191 is integrally formed in the vicinity, a lock claw (to) is formed at the front end, and a lock release projection C3]1 is formed at the lower end. The lock lever 2 is inserted into the bottle insertion hole provided in the side wall (4a) by its fulcrum pin 4.

Its fulcrum bottle c! 9) is attached so that it can rotate freely in the front and rear directions. As shown in FIG. 3, the rear end (25c) of the torsion coil spring C1. As a result, the lid (4) is rotated in the direction of closing the lid, which is the direction of arrow a in FIG. As shown by the solid line in FIG.
The lock claws 6()1 of the Hc lock levers 3 to 3 are engaged from below to lock the front lid +41 in the closed lid position.

According to the tape force set configured as above in AJ).

First, when the cassette is not in use, the front cover (4) is locked in the closed state with the lock lever 1 (!8JK) as shown by the solid line in Figure M3.In this closed state.

As shown by the solid line in FIG. 4, the magnetic tape t81 bussed along the front ln opening (101)
It was lying on its side as if being wrapped around it from the front and back by ``+''.

It is a so-called completely sealed tape cassette.

Next, when the tape cassette is loaded into the video tape recorder, the lock lever (C) is activated as shown by the imaginary line in FIG.
Lock release protrusion 81JIC lock release member r35
) is suppressed, the lock lever seal is twisted, and the coil spring (
c) is rotated in the lock release direction, which is the direction of arrow b', and the front cover (4) is unlocked, and the front cover (4) is pushed up between the cover opening members, The front cover (41) is rotated by 90 degrees in the direction of arrow a' against the torsion coil spring G to open the front opening a. ) is rotated 906 in the direction of arrow a' from the closed lid position shown by the solid line in Fig. 4 to the open lid position shown by the tentative ? Since both fulcrum bins 081 of the rear lid (5) are also rotated in the same direction and at the same angle, the rear M (51 and the front M (41) are also rotated by imaginary lines from the closed lid position shown by the solid line in Fig. 4. The lid is rotated to the indicated opening position.At this time, both fulcrum bins α& are rotated in the direction of the arrow a', so that the two guided bins 031 are guided by the guide grooves I211, and the two supporting bins α& are rotated in the direction of the arrow C. moved in the direction.

By the guiding action of both guide grooves Qυ, the rear cover (5
1 is opened in the direction of arrow a7j while being rotated in the direction of arrow d, which is the direction of arrow d, to separate the front cover (4) from the front cover (4) at the center of both fulcrum bins (181'Y). (Also, when the lid is closed, the front lid +41 is rotated in the direction of the arrow a in Fig. 4 in the reverse operation when the lid is opened. arrow a while being rotated to
The guided bin (231) also moves in the direction of arrow C between the guide grooves and returns to the lower end of the guide groove Qυ shown by the solid line in FIG.

Next, the assembly structure and method of assembling the cassette housing (3) will be explained with reference to FIGS. 5A to 7.

First, Figures 5A to 5C show the front cover (41) on the upper half fi+.
These diagrams show how to temporarily fasten the upper half (1) and front cover +41'? Shown upside down.

Further, it is assumed that the rear lid (5) is already rotatably attached to the inside of the front lid (4).

Next, as shown in Fig. 5A (, @ A pair of fulcrum bottles (161'k) of the lid + 41, a pair of four parts to be fitted (4IJ is the lower edge (lb) of the left and right side walls (1a) of the upper half + I+ (Fig. The torsion coil spring (2ω is inserted into the outer periphery of the -10,000 fulcrum pin 05) of the front cover (4) by its coil 1 (25a),
Its front end (25b) is locked to the spring locking protrusion ■,
The rear end (25c) is locked with a locking protrusion (331K) which also serves as a spring temporary fixing protrusion.

Next, in this state, 1 VIT lid + 41 '2 upper half (1
7 from the direction of arrow e as shown in FIG. 5B.

Both fulcrum pins Q51 are on the lower edge of the upper half + IJ (lb)
After the upper half has been slid, it is fitted into the recess (4υ) at the same time as shown in Fig. 5C.In this way, insert the front cover +41 into the upper half (1) from the direction of arrow e, Fulcrum bin (
The process of fitting 151 into both recesses (4υ) can be carried out extremely easily using an automatic assembly machine.

Next, as shown in Figures 5C and 6, the upper half (1) -
At a position on the outer surface of the side wall (la) rearward of the concave portion (4υ), a wedge-shaped temporary fixing protrusion (42) as shown in FIG. 6 is integrally formed.

Therefore, as shown in FIG. 5B, both fulcrum pins σ51 and both concave portions
After fitting within 4υ tL, press the rear end (25c) of the torsion coil spring (25) against its elasticity in the direction of the arrow f, as shown in Figure 5C. ) is slightly twisted against its elasticity (spring force), and
The rear end portion (25c) near the coil portion (25a) is pushed under the temporary fixing protrusion (421) as shown by the imaginary line in FIG. 5C and is not temporarily fixed as shown in FIG. 6. The process of pushing the rear end (25c) of the torsion coil spring 4 in the direction of the arrow f and locking it to the temporary fixing protrusion (42J) can be performed very easily using an automatic assembly machine.

The 8iJ lid (4) is temporarily attached to the upper half (11) on the AJ.

After J2J, as shown in Figure 5D, the soil half flJ and front lid (
Even if the direction of 4) is in the normal vertical direction, the front item (4) will not fall below the upper part (II). In other words, the 5th c
In the temporarily fastened state shown in the figure, the front cover (4) is fitted with a torsion coil spring (
251 to rotate in the direction of arrow a, which is the lid closing direction.
) is bent in an L-shape toward the rear of the body.
Its upper end [4b] is the left and right side walls (1) of the upper half (11).
a) is abutted against the front end (IC) of the fi 14
1 is restricted from rotating in the direction of arrow a, and the lid (4) is held (temporarily fixed) in the upper half.

On the other hand, as shown in FIGS. 6 and 7 (on the outer surface of the upper half (one side m11a of 11) and further back from the temporary fixing protrusion 1424K, there is a cross section that is open in two directions, forward and downward. 43 is integrally molded, and the rear end (25c) of the torsion coil spring (c)
As shown by the imaginary line in Fig. 5C (when the protrusion for temporary fixing (421LL) is locked by being pushed in the direction of arrow f, the rear end (25C) becomes U-shaped as shown in Figs. 7 and 6). wall(
The rear end (25c) is inserted into the slit (44I) provided inside the slit (44I).
1, and the side wall (1a) of the upper half (1)
) is prevented from moving in the left-right direction (in the direction of arrow g in FIG. 7). At this time, a pair of Tsukuda slanted guide surfaces (45
Since the rear end (25C) is inserted into the slit (44), the rear end (25c) is guided by both inclined guide surfaces (451) and passes through the slit (inner is inserted smoothly.

Next, after temporarily fixing the front cover (4) to the upper half + I+ as described above, as shown in Figure 5D (Iiii By lowering it in the direction of the arrow and fitting it, the cassette housing (3) shown in FIG. On the upper end (28a) of the lock lever, which is the contact part, there is a coil spring
The material contacts extremely easily and accurately against the elasticity (spring force) of the material. Note that when fitting the upper half (IJ) onto the lower half (2), as shown in FIG. , Rear cover (5) inner cover guide bin 1231 lower half (
Align with the upper ends (21a) of both guide grooves 12υ of 2;, and fit the upper half (1) onto the lower half (2),
The inner guide bin 31' is inserted into both guide grooves 1211 from its upper end (21a).

However, at this time, as shown in FIGS. 6 and 7, the outer surface of the side wall (2a) of the lower half (2) has a front surface.

A U-shaped wall (47) is integrally molded with a cross section that is open in three directions (upward and downward) and has a Y-bifurcated shape, and a pair of recesses ( 481 is provided.And the lock lever example is seven U-shaped walls (
(49) provided inside the fulcrum bottle (2!
81 and is locked. And the lower half (
2) When the upper half mountain is fitted on top, the upper half (
IJ (7) U-shaped cap 1~ is the U-shaped wall (4) of the lower half (2)
η as shown in FIG.
The rear end (25c) of the torsion coil spring (c) whose position is restricted inside comes into contact with the upper end (28a) of the lock lever (c) against elasticity.

Therefore, the contact action of the rear end (25c) of the torsion coil spring (2ω) on the upper end flBi [28a] of the lock lever rigidity is caused by the slit (44I) of the upper half +I+ that regulates the position of the rear end ill (25C). Since the rear end (25C) can be brought into contact with the upper end (+28a) of the lock lever (to) extremely easily and accurately against elasticity.

Incidentally, as shown in Figure 7, the upper and lower halves (1) (2)
+441 (The horizontal width L! and L2 of 491 are configured to be equal to each other, and the lock lever
The width L3 in the left-right direction of the upper ttA portion (28a) is also formed to be as close to these L+ as possible.

Furthermore, when assembling the cassette housing (3) as described above, the front cover f41 is temporarily attached to the upper half (1).

Moreover, since the upper half (1) and the front cover (4) are fitted together on the lower half (2), it is difficult for the upper half (1) and the front cover (4) to separate apart when they are fitted together. As a result, it is difficult for the upper half fi+ and the front lid 14+ to be accidentally misaligned with respect to the lower half (2) both in the front, back, left and right directions, and they can be fitted together extremely easily and accurately. It should be noted that the process of fitting the upper half Fll front M+41 together with the lower half F1-F21 in this manner can be carried out extremely easily using an automatic assembly machine.

And as above, upper and lower halves [11+21 and front lid +4
After fitting 1, upper and lower half fil f2+ 'a?
The assembly of the cassette housing (3) is completed by fixing and joining together with multiple screws, but as mentioned above, the rear end (25c) of the torsion coil spring (c) is connected to the lock lever ( 281 against the upper end (28a), the torsion coil spring C1!
51 is twisted into a predetermined state, and the torsion coil spring 051
is given an initial stress in a predetermined state. As a result, the front lid (
4) and the lock lever (281) are urged to rotate in the directions of arrows a and b in FIG. 3, respectively, with a predetermined force.

Also, by fitting the upper and lower halves il+ (2) from above and below.

As shown in FIG. 3, both recesses (4D are the upper edges (2b) of both side walls (2a) of the lower half (2)) are provided on the lower edges (1b) of both side walls [1a] of the upper half [11]. At the same time, both recesses (48) provided at the upper edge of the U-shaped wall (47) of the lower half (2) are closed at the lower edge of the U-shaped wall (47) of the upper half [11]. Therefore, the front cover +41
Both fulcrum bins (15) and both left and right ends of the fulcrum bin (15) of the lock lever are the upper and lower halves (both sides W+1 of the moon (2)), respectively.
It is pivotably supported between a) and (2a) in a state in which it is sandwiched from above and below and shifted. In addition, upper and lower half +11 [2
The + screw fixing process can be performed extremely easily using an automatic assembly machine.

In addition, in the embodiment described above, one torsion coil spring (2
5) between the front cover +41 and the lock lever (28).
In order to double the two rotary urging means '1'', a torsion coil spring (251 rear end (25C) '& frog bar (28
), but the contact portion on the lower half (2) side in the present invention is not necessarily limited to the upper end (28a) of the lock lever (28). However, any structure and shape of the abutting portion provided on the lower half (2) side may be used.

Application Example The present invention has been described above as an embodiment of the present invention, but the present invention can be applied to tape cassettes for various recording and reproducing devices other than video tape recorders and various other information processing devices.

Effects of the Invention The present invention is configured such that the lid is temporarily attached to the upper half and then fitted onto the lower half, so that the front lid and the upper half do not come apart when they are fitted together. It is difficult to separate and can be fitted very easily and precisely onto the lower half without causing any misalignment with the upper half.

In particular, with the front cover temporarily attached to the upper half, insert the rear end of the torsion coil spring into the slit provided in the upper half to control the position, and then fit it onto the lower half of the upper bar. When mating, the torsion coil spring is configured so that its position is regulated within the rear end case slit, and the spring comes into contact with a predetermined contact portion provided on the lower half side against elasticity. Therefore, the process can be performed extremely easily and accurately.

Therefore, according to the present invention, it is possible to assemble the cassette case extremely easily and accurately.

A major advantage is that an automatic assembly machine can be easily introduced and the automatic assembly of the cassette case can be easily performed.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a tape cassette for a video tape recorder. Fig. 1 is an exploded perspective view of the whole, Fig. 2 is a plan view of the same as above in a completed state, Fig. 3 is a partially cutaway enlarged side view of Fig. The figure is Figure 2 IV-1
Figures 5A to 5C are enlarged cross-sectional views taken along the %'line; side views similar to Figure 3;
The figure is an exploded perspective view of the main parts, and FIG. 7 is an enlarged sectional view taken along the line 3--3. Also in the symbols used in the drawings. (II...... Upper half (la)... Upper half side walls Nb)...
・・・・・・Lower edge of upper half +21・・・・・・・・・
・・Lower half (2a)・・Both sides walls of lower half (2b)・
......Top edge of lower half (3)...
...Cassette housing (41...Front lid (61+7)...Reel t8+...Magnetic tape σ0)...・
...Front opening Q5121 ...Fullin bin (25) ......Torsion coil spring + 25
a) Coil part of torsion coil spring (25b
)...Front end of torsion coil spring (25c)...
・・・・Rear end of torsion coil spring (26j・・・・・・
...Rigid spring locking protrusion...Lock lever (28a)...Top end of lock lever...
・・・・・・Lock protrusion (spring temporary fixing protrusion) (4υ(48)・・・・・・Concavity ′(42)
1...Temporary fixing protrusion f4, 17149
＋・・・・・・・・・Slit. Agent Souvenir Katsutsune Kano Yoshi Toshiki Sugiura (Order) Procedural Amendment (Method) July 7, 1981 1. Display of the case 1989 Patent Application No. 45225 2. Relationship with the title of the invention case Patent application Person MC'l'Ha','1. ”I: ”s :L IM
For 1 river c - J' j + 7'% No. 35 (218)
Sony Corporation 6, number of inventions increased by amendment 7, subject of amendment Procedure dated June 8, 1982 (shipment date: June 28, 1988) for the Kusunoki invention of a brief explanation of drawings in the specification Based on the amendment order, "Figure 5C" on page 22, line 14 of the specification of the present invention will be amended to "Figure 5D."-That's all- ・(2)゛

Claims (1)

[Claims] A cassette case consisting of an upper and lower half, with the stored tape bussed along the front opening, and a Y-shaped planar shape: F-shaped without T and a pair of fulcrum bins inside both left and right ends. a front lid rotatably supported on both left and right walls of the cassette casing via the pair of fulcrum bins to cover the front side of the passed tape; is a torsion coil spring with a coil part integrally provided in the center part, and the coil part is inserted into the outer periphery of the small fulcrum bottle of the front lid, and both ends are attached to the front lid. In the tape cassette, the pair of fulcrum pins '2fF of the pair of front lids should be aligned. 4faY is provided on the lower edge of the left and right side walls of the upper half, and on the inside of the 10,000-inch end of the front lid and on both front and rear sides of the fulcrum bin, there are locking protrusions for the front end of the torsion coil spring. A protrusion for temporary fixing is provided at the rear end, and a slit is provided on the side wall of the upper half for inserting the rear end of the torsion coil spring, and a temporary fixing protrusion is provided at the rear end inserted into the slit. A temporary fixing protrusion is provided for the purpose of fixing, and the front and rear ends of the torsion coil spring inserted into the outer periphery of the fulcrum bottle are respectively locked by the coil part to the stopping protrusion and the temporary fixing protrusion of the front cover. In this state, the pair of fulcrum pins of the front cover are fitted into the pair of recesses of the above-mentioned upward-7, and in this state, the rear end ff of the curved coil spring is
1l' Insert into the slit of the upper half against the elastic force so that the rear end is locked with the temporary fixing protrusion of the upper half, and then place the upper half on the lower half. By fitting, the rear end s of the torsion coil spring whose position is regulated within the slit can be brought into contact with a predetermined contact portion on the lower half side against elasticity. thing'&! A tape cassette with a signature.