JPS5862877A - Tape cassette - Google Patents

Abstract

PURPOSE:To eliminate undercut when molding a metallic mold, and to improve a manufacturing effeciency of a cassette, by forming a guide groove for guiding the opening and closing operation of the inside cover, in the fitting part of the upper half and the lower half of a tape cassette. CONSTITUTION:The inside of a tape cassette is partitioned by partitioning walls 21, 22, and on both the left and right end parts of these partitioning walls 21, 22, a pair of guide faces 23, 24 are provided, and when the upper half 2 is fitted into the lower half 3 in the direction as indicated with an arrow (a), a pair of guide grooves 31 are formed. A guide pin 81 of an inside cover 39 is guided to this guide groove 31, and the opening and closing operation of the inside cover 39 is executed. If such a guide groove 31 is formed independently on the upper half 2 and the lower half 3, under-cut is generated, and it is impossible to mold a metallic mold, but since the guide faces 23, 24 is formed opposingly as mentioned above, injection molding by a metallic mold can be executed. Therefore, a manufacturing efficiency of a cassette can be elevated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a tape cassette that is most suitable for application to a recording device such as a video tape recorder and other various information processing devices. The tape cassette for use in the cassette is provided with an opening on its front side, and a cutout continuous with the opening is provided on the bottom surface of the cassette. The tape is then passed along the opening.

By the way, in a typical tape cassette, the front side of the tape is covered with a front cover that can be opened and closed, but the back side of the tape faces the notch and is not exposed. Therefore, there was an inconvenience that dust, etc. could enter through the notch and adhere to the magnetic surface of the tape, easily causing dropouts during recording or playback. A so-called sealed type tape cassette has been observed. Various types of opening/closing mechanisms for the inner lid of this sealed tape cassette can be considered, but one example is one in which the inner lid is opened and closed in conjunction with the front lid. That is, a guide groove is formed in the notch, and the inner cover interlocking with the front cover is guided by the guide groove to open and close.

However, since the guide groove usually has a sloped portion, there is a problem in that the upper sloped portion becomes undercut when the tape cassette is molded using a mold. For this reason, the guide groove cannot be formed at the same time as the tape cassette is molded, which poses a problem in its manufacturability.

The present invention has been developed to effectively solve the above-mentioned problems, and by forming the guide grooves on the fitting surfaces of the upper and lower halves of the tape cassette, the guide grooves are formed on the fitting surfaces of the upper and lower halves of the tape cassette. The purpose of this invention is to eliminate undercuts in the tape cassettes, thereby improving the manufacturability of tape cassettes.

An embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described below based on the drawings. Beak.

As shown in Figures 1 to 3, the tape cassette (II is a rectangular upper half (2) and lower half 1 made of synthetic resin)
31 (:), these upper bars 7 (2) and lower bars 1-
The screws (31 are fitted together from above and below, and the setscrews (4)
- (7) are screwed together to form an integral casing. Inside this tape cassette (++, a pair of tape reels (81 (91) are rotatably stored, magnetic tape (hereinafter simply referred to as "tape") (1 (II) is stiff, and both tape reels (8) (9).In addition, one tape reel +81 (91 is its reel hub (8)
a) The lower end of (9a) is the lower half (
The reel is fitted into a pair of reel fitting holes 0υG2+ provided in the bottom wall (6a) of 31 for horizontal positioning. A pair of presser springs a3 are housed in the respective reel hubs (8a) and (9a), and this pair of presser springs (
A pair of caps a4 are placed over the upper end of +31. When the tape cassette (11) is installed in the cassette mounting position within the video tape recorder body, a pair of reel drive shafts (not shown) are inserted into the pair of reel hubs (8m) (9a), and at this time, the pair of caps 041 are inserted into the pair of reel hubs (8m) (9a). Pivot part Q5i is the upper surface II (2a) of the upper half (2)
On the other hand, both tapered Q-rules 18, (9) are urged toward the reel drive shaft by the presser spring (13), and the lower end surfaces of the respective reel hubs (8a, 9a) are connected to the pair of reel drive shafts. Both tape reels (8a) (
9m) is configured to be positioned in the vertical direction.

As shown in FIG. 2, an opening agI is provided on the front surface of the tape cassette (1) over approximately the entire width of the cassette.

The bottom wall (3a) of the lower half 31 is provided with a continuous notch Qe at this opening, as shown in FIGS. 2, 3, and 5. Furthermore, the upper wall (2a) of the upper half (2) has an upper P opening 08 as shown in FIG.
An upper notch part (2) which is continuous with the part (1) is provided.

I was surprised to find that the tape cassette (11 normally has its opening 08 covered by the front cover (b) and the rounded upper notch (■) covered by the top cover (to), as shown in Figure 1, and the long fifth As shown in Figures 912 and 11ζ, a partition wall QB that stands directly up from the opening and the notch is integrally molded with the lower half.

In addition, this partition wall (
21) Another ward that is symmetrical to -4I! (2) is integrally molded. Then, when both the upper and lower halves (2++31 are sung together, the ward 1lil wall (the upper end surface of 211 and the ward ll1
llI! (C) The lower end surfaces are in close contact with each other, and the notch is 0.
The upper notch (2) and the inside of the tape cassette (11) are partitioned by a partition wall (2m) C) 21. In addition, when fitting both the upper and lower halves +21 (31), pull out the tape Q111 slightly as shown in Figure 3 in order not to damage it. A pair of positioning holes αη are formed in the lower surface of the lower half (31), and when the tape cassette is installed in the video tape recorder body, a pair of positioning pins provided at the cassette installation position are inserted into the pair of positioning holes. The tape cassette is inserted into the tape cassette and positioned in the tape cassette.

A pair of guide surfaces (c) are formed at both left and right ends of the partition wall 31), as shown in Figure 8, and a pair of guide surfaces (c) identical to these guide surfaces (to) are formed at both left and right ends of the round partition wall (2). Another pair of shaped guide surfaces (2) are formed. Guide surface (c) (24
1 has a dogleg shape, that is, a vertical surface portion (2
It consists of a tao (to) and a slightly sloping slope part @ (c).
Plan y=1rkJ (c) without causing undercut when injection molding both upper and lower halves (2113) with a mold.
(2) can be formed at the same time. When the upper half (21) is fitted to the lower half (31) from the direction of arrow a in Fig. 8, the guide surfaces (c) and (2) face each other as shown in Figs. A pair of guide grooves 0 into which a pair of guided bottle fittings υ of the inner lid (end) are inserted.
1) ◎ Therefore, when forming the guide groove c3D independently in the upper half (2) or the lower half (31), the mold -
ζ was impossible to form, but since the guide groove OD was formed by facing the guide surfaces Q3 (2) as described above, the guide surface c! 3) When injection molding both the upper and lower halves (21131) using a mold, it is possible to mold (2) at the same time, resulting in good manufacturability.

At both left and right ends of the ward mrricra, as shown in Figure 8, the above-mentioned guide ItlG! A pair of cylindrical tape guide parts 02 are formed on the front side of 4I. The lower ends of the pair of tape guide parts 64 are connected to the bottom surface Ii of the lower half (3) so that there is no seam on the tape guide s6. (3
m) Extends with a violet, and has a set screw (41
The tip of 151 is shaped so that it can be screwed in.

And the tape QOI or Figure 2, #! As shown in FIGS. 4 and 5, the tape is guided by a pair of tape guide sections (34) and passes along the opening (I).

As shown in FIGS. 6 and 8, a pair of bracket portions (36) are provided at both left and right ends of the front side of the upper half (2). The pair of bracket portions 1 are provided with a pair of pin holes into which the pair of fulcrum pins 6 of the front lid (b) are inserted. In addition, on the outer surface of the pair of bracket parts (to), there is a pair of slopes w@4 from the upper end ai8 of the bracket part c161 to the edge of the pair of bottle holes (6).
is formed, and insert the pair of fulcrum pins (411) of the front cover 07 into the pair of inclined surfaces 6 in the direction of the arrow in FIG. It is configured so that it can be inserted into the older sister.Therefore, the front cover can be easily attached.

On the bottom wall (6a) at both left and right ends of the lower half 31 on the front side, as shown in FIGS. 8 and 9, there are elastic locking claw bodies integrally molded in a substantially U-shape from plastic.
However, there are membrane characteristics:'. A fixing pin 4, which is provided on the bottom wall (6 holes), is inserted into the attachment hole of the lock claw body and then heat welded thereto. The rotation of the base end 0η is regulated by a pair of retaining pins.
As shown in Fig. 9a, the distal end forms a claw portion 621 having an inclined portion 6υ, and this claw portion is connected to a pair of claw holes 63 provided in the left and right chest walls (6b) of the lower half (3). ) to the outside. In addition, as the lock claw body (41++), a 4-pin type as shown in Figure 9b may be used.!9b
The lock claw body ■ shown in the figure has a base end C7I and a claw part 5 connected by two spring parts that are substantially parallel to each other, and has a so-called parallel link machine #II structure. , the claw portion 6a moves approximately in parallel, ensuring reliable operation.

Both upper and lower halves (mainly front 1I11 of 21+31)
As described above, the structure of the front lid on and the upper lid
and the inner lid (391 details will be explained. First, the front lid C
1? As shown in FIGS. 6 and 7, ll has a substantially U-shape, and a pair of support door bins (41+13!) are formed on the inner surfaces of the left and right side plate portions (37a). A pair of fulcrum pins Qυ are pivotally supported by a pair of pin holes (6) of a pair of bracket portions (G) of the pair of brackets, so that the front end is rotatable.

On the 11th surface of the Il plate (57 m), a pair of spring retaining protrusions @6η are formed on both the left and right sides of the fulcrum pin 0υ, and a pair of torsion springs (to) are formed on the pair of fulcrum pins. is attached, and both ends of the pair of torsion springs Q are slightly torsionally biased, and the above-mentioned pair of spring retaining protrusions @6? ) is locked. In addition, the convex part for spring stop (goods)
is for temporarily fixing one end (58a) of the torsion spring shaft, and when the front cover 0D is attached to the pair of bracket parts α0 from the direction indicated by the arrow in FIG. One end of the spring acid (58a) and both left and right ends of the front edge of the upper half (2) (5! )
12 and 13 by a pair of torsion spring shafts. A pair of fulcrum pins 0υ
It will be rotated and energized counterclockwise around .

A pair of lock holes are provided in the lower portions of the pair of side plates (37a).A pair of slits 6υ are provided at both left and right ends of the lower edge of the front lid On.

The above-mentioned lock hole is placed at a position facing the claw hole when the front cover is closed, and the bent slit 6v is located between the side wall (3b) of the lower half (31) and the side plate of the front cover (b). Part (3
7a). Therefore, the claw portions 62 of the pair of locking claw bodies protruding from the pair of nail holes are Wl,
As shown in Figures 9a and 9b, when the front cover is closed, it is engaged with a pair of lock holes, but the tape cassette (
11 into the cassette mounting position in the video tape recorder main body, the pair of lock release pieces I2 provided at the cassette mounting position are inserted through the pair of slits 61) and locked with the pair of claws 62. It is made in such a way that it is released from the hole.

At the front upper part of the pair of side plates (37a) of the front lid (9),
As shown in FIGS. 6 and 7, a pair of pin holes are provided facing each other. On the other hand, advance! A pair of fulcrum pins iJJ &'+I are provided at both left and right ends of (to), and the pair of fulcrum pins are inserted into the pair of bottle holes mentioned above, and the upper lid □□
□ is rotatable around both fulcrum pins 64). Note that one fulcrum pin is longer than the other fulcrum pin, and a substantially C-shaped spacer is click-fitted to the fulcrum pin as shown in Fig. 7, so that both fulcrum pins are connected to each other. 64165t is prevented from coming off from both pin holes 11. That is, as shown in Figure 7, the fulcrum pin is provided protruding from the notch step, and connects the top cover (end) to the front cover (goods).
When weiring to J:! (to) with *7El as shown by the dashed line, insert the support pin into one of the pin holes, then shift the top cover (to) a little to the side and move the fulcrum pin to the other side. Insert it into the bottle hole. and the upper lid (to)
is rotated in the direction of arrow C in FIG. 7 to make it horizontal, and the upper spacer branch is click-fitted into the fulcrum bottle from the direction of arrow e in FIG. Since the shavings are used in this way, attaching the top cover is easy and the attachment is reliable. The front edge of ±ik (to) is a circular arc surface as shown in Figure 7, so there is no gap between the front edge of the jacket (to) and the upper edge of the front cover (goods). It's like that. The rear edge of the top lid is No. 61g, [7
As shown in Figures 9 and 12 and 13, the front edge of the upper half (2) is flat, and the front edge of the upper half (2) that touches the rear edge of the upper ti As shown in FIG. 16, the sloped surface 1 has the same inclination angle as the sloped surface 1. Therefore, when the upper cover (toward) is closed as shown in FIG.
As shown in FIG. 13, the i- can be slid backward and upward by ζζ.

As shown in FIG. 6, a pair of spring engagement parts συ are provided at both left and right ends of the lower surface of the upper lid □□□. There are also a pair of spring locking parts ff on both left and right ends of the inner surface of the front cover (b).
A is set up. and a pair of spring locking parts συ and σ
A pair of tension springs (to) are installed between z(!-), and the upper cover (to) is biased to rotate in the direction of arrow d in Fig. 6 by this pair of tension springs (to). A pair of bracket parts σ◆ are also provided at both left and right ends of the lower surface of the (end), which are slightly closer to the center than the pair of pa and screw locking parts συ and are adjacent to the rear edge of the upper part. .A pair of fulcrum pins (7bIcη
is pivotally supported, and the inner ti- is rotatable around both fulcrum pins σQ. Note that one of the fulcrum pins σe is provided to protrude from the notch step a, and is configured to be longer than the other fulcrum pin ση. When attaching the inner cover (to) to the upper cover (to), first attach the fulcrum pin ffe to one of the bottle holes ffω
Next, shift the inner cover a little to the side and insert the fulcrum bottle surface into the other bottle hole σj. Then, insert a roughly C-shaped spacer σ bell into the fulcrum pin σe from the direction of the arrow f in Figure 6. It clicks into place.

By doing this, the inner @ (39 (1) A pair of sloped surfaces (74a) that are continuous with the sloped surface 1 formed on the edge are pressed, and when Shigataku moves backward and upward, the pair of sloped surface portions (74a) form the upper half. (2)
It is configured so as to be in sliding contact with the inclined surface of.

Inside I! As shown in FIG. 6, a pair of brackets are protruded near the lower end of the inner lid at both left and right ends of the outer 111 surface of the noodle (the surface facing the notch al). The pair of guides #101 are attached to the tips of the pair of bracket parts (■).
A pair of guided pins υ are inserted into the inner It(2) and protrude toward one side thereof.

By the way, at the lower end of the front cover (9) there is a chick 12 as shown in FIG.
As shown in FIG.
At the same time, the lower edge of the inner lid (91 is in contact with the inner surface of the tip of the edge plate part (goods) to partition between the opening part 08 and the notch part (+91). The inner surface of the tip of the edge plate @4) forms a flat inclined surface as shown in Figs. 12 and 2113, and the edge plate of the front cover C1? The front lid 0D is curved so that it can be opened smoothly without getting caught in the lower m-tightener.

The details of the front cover C (7), the upper cover (to), and the inner 11 (to) have been described above, but when assembling the towara, first the upper cover (to)
Attach the inner trclI to the corresponding weight and attach the upper cover □□□ to the front 11@. Then, move the front cover 0η from the direction indicated by the arrow in Figure 8.
Attach to. At this time, the pair of guided pins of the inner Irc3n are inserted into the pair of guides #Gυ from their upper ends.

Next, the reel lock device provided in the tape cassette (1) will be explained. This reel lock device is the 6th
As shown in Figure 5, the tape force is set, and as shown in Figure 11, a pair of left and right first claw bodies, and a pair of left and right claw parts.
and a torsion spring aυ. A pin hole bell is provided in each of the pair of first claw bodies (towards), and on the other hand, the bottom wall (3a) of the lower half (31)
A pair of support bins on the left and right protrude from the top. The pair of first claw bodies (c) are rotatably inserted with their respective holes (e) facing the support pins. On the other hand, the second claw body is placed on the bottom wall (3 m), and the left and right sides of the second claw body are set on the bottom wall (3 m).
It is sandwiched by 1. The second pawl body is guided by a pair of inner plate portions, and the second pawl body is guided by the bottom surface W1. C5m) can be freely slid in the front and rear directions. In addition, the bottom wall (6a
) is provided with a longitudinally elongated hole (E) between the pair of guide plate parts (E), and a lock release pin (103) (described later) can be inserted into this elongate hole (E). l is being strained.

,,,1゜The pair of first claw bodies are approximately T-shaped as shown in Figs. The suppression department kan and spring uke have department information. Further, the back side of the spring receiver portion forms a stopped portion (2). On the other hand, the second claw body has a main body part (101) in which the pair of claw parts protrude in a V-shape in front thereof, and the upper surface of this main body part (101) has a spring support pin (102). ) is provided protrudingly, and a pin hole (104) into which the lock release pin (103) is inserted is provided on the lower surface. Also, the main body (
The rear surface of 101) forms a suppression portion (105). In addition, the above pair of JIll claw bodies (c) and tX2 claw bodies -
is made of plastic, especially the pair of claws 18 of the number 2 claw body! Jl is elastically formed into a V-shape.

A torsion spring Q11 is inserted into the spring support pin (102) of the second claw body, and both left and right ends of this torsion spring @υ correspond to the pair of spring holders of the pair of claw bodies. being touched. Therefore, the pair of first claw bodies are #! centered around the pair of support bottle rods. In Fig. 11, the second claw body is rotated in the direction of arrow g and in the direction of arrow i, respectively.
energized in the direction.

The pair of first pawls - normally have their stopped portions 4 in contact with the lower half; 3) rear wall (6c), making it difficult to rotate in the directions of arrows g and It is stopped, and in this state, the pair of claws - are connected to the pair of tape reels +81 (
It is adapted to mesh with a pair of ratchet portions (106) provided on the outer periphery of the lower reel flange portion (9b) of each of the lower reel flange portions (9b). However, the pair of claws is the tape reel 181
(The straight line I [υ
In other words, the tape reel (81) rotates counterclockwise in Figure 11, and the tape reel (9) rotates clockwise in Figure 11. Both have been blocked.

On the lower half (31st wall (6a) is the 111th
& As shown in FIG.
In the figure, if the movement is always in the direction of the arrow, this stomper part (107
) is prevented. In this state, the pair of claws - are connected to both tape reels (81(9)) in a check-shaped II (
In the state shown by the solid line in Fig. 11), the pair of first claw bodies -
A predetermined gap is not formed between the suppressed part of the second claw body and the pressing part (105) of the second claw body. A pair of claws (c)
) are curved so that the timing of engagement is shifted back and forth.

The configuration of the reel lock device has been described above, and next, the erroneous erasure prevention device (115) will be described. This accidental erasure prevention device (115) is provided at the rear corner of the lower surface of the ζζ tape cassette (11) as shown in FIG.

Specifically, as shown in FIGS. 14 and 15, square holes (116) are formed in the vertical direction at the corners of the tape cassette (1).
A block (117) formed of plastic in the shape of a rectangular frame is fitted into this square hole (116) so as to be movable up and down. The lower end of the square hole (116) has a first cut hole (118) and a second cut hole (119) which are shaped and communicated with each other on the bottom wall (3a) and rear wall (3C) of the lower half (31). They are connected to each other, and the first Kiriyaguchi (118
) or the second notch (m9).A detection piece (not shown) for preventing accidental erasing can be inserted into the cassette mounting position from either the opening (m9) or the second notch (m9). Copper block (117).

Push upwards to open the first notch (1'18) and the second notch (119) as shown by the dotted # line in Figure 15.When erasing, insert the insertion hole (120). Insert a pin or the like and push the block (117) downward as shown by the dot in Figure 15 to open the #1 notch (118) and the #1 notch (118) and II
Block off the K2 Kiri crater (119) and leave it alone. In Figure #14 and Diagram 15, (121) is an engagement recess formed on the inner surface of the square hole (116), and (122) is a retaining protrusion formed on the block (117). The convex portion (122) engages with the engagement recess (121) when preventing erroneous erasing, and engages with the second notch (119) during erasing. 4 The sea urchin is nestling.

Next - The operation status of the tape cassette (11) marked as described above will be explained. Chief cassette (11 usually has an opening as shown in Fig. 12 (the tape QQ passed along 181 is By the front cover C171,
The back 1lki is closed by the inner lid, and the upper end is closed by the upper O. Therefore, in this state, there is no risk of the tape cassette being damaged by dust, etc., and the tape cassette (11) is extremely reliable. The fulcrum pins fff9 to ff7) are pivoted to the pair of pin holes σ9 of the pair of bracket parts ff4 that are in contact with the rear edge of the top cover (to) g4, and the lower end of the inner cover 09 is supported by the pin holes σ9 of the front cover (b). Since it is still in contact with the edge plate part (goods) spread out at the lower end, the inner lid (to) crosses the section diagonally between the opening part α81 and the notch part a, and the tape (101 A slightly wide space (108) is formed in the back of the tape. Before! (Foundation) and Inside!! (2
) There is no risk of damage.

In addition, in the above-mentioned closed state, FIG. 9a or 9b
As shown in the figure, the claw part 6'J of the double-ended pricking claw body (roller) is engaged with the double-ended pricking hole of the both side plate parts (37a) of the front lid plow, and the front fii C37J is inadvertently removed. I'm trying to prevent it from being gj/iii.

On the other hand, Chief Casella? (When the II is installed inside the video tape recorder body, the Iζ front ba
As G9 rotates upward, the upper cover G9 slides rearward and upward, and the bent inner cover G9 moves rearward while rotating upward. Therefore, the front and back sides of the tape αα are opened. That is, when the tape cassette (11) is inserted, for example, into the cassette holder of the main body of a video tape recorder, the pair of left and right unlocking single movements provided in the cassette holder etc. in FIG. As shown in the figure, it is inserted relatively into the pair of left and right slits of the front cover (2) from the direction of arrow j.

Then, both lock release bells press the inclined part of the claw part 6■ of both locking claw bodies, and both claw parts 6z are
Move in the direction of the arrow with 9bWJ to disengage both claws 6z and the Oka lock hole.Next, move the tape cassette (11 downward in Fig. 12 and install it to the cassette mounting position, and the cassette A pair of left and right positioning pins ab+ provided at the mounting position are inserted into both positioning holes aη to position the tape cassette (l+) as shown in FIG. The protrusion (109) IC pushes up the front cover ■, and the front *an rotates upward against the force of a pair of torsion springs (end) and a pair of tension springs as shown in Figures 2 and 16. At this time, the upper lid (to) slides rearward and upward as shown in Fig. m13 while the slanted surface portion (74 m) of the pair of left and right bracket portions is guided by the sloped surface portion of the upper half (2). , and finally climbs onto the upper surface of the upper half (2).The pair of guided bottle handles on the left and right sides of the inner 1ic39 are guided by both guide grooves Gυ and are pulled diagonally upward by the sliding movement of the upper cover (to). In order to be raised, it rotates upward and moves backwards.Therefore, at this time, the lower end of the inner cover (c) rises while drawing a gentle circular arc trajectory that is almost vertical, so that the lower end of the inner cover (c) The lower end of the tape 001 does not come into contact with the back surface of the tape 001. Although it is located on the left side, when the cassette is installed, the 16th
As shown in the figure, when the tape +101 is pulled out by a pair of left and right tape pull-out rollers (not shown) provided at the cassette mounting position, a pair of tension springs σ4 actuate the tape to be pulled out ( 1 (not a hindrance to 11).

As described above, the front cover (b), upper rear door, and inner cover G91 are opened, but the upper am and inner cover C39) are opened in conjunction with the opening operation of the front cover c3 force. Therefore, the upper lid (
There is no need to provide any special protrusions or the like at the cassette mounting position to open the inner lid (to) to (to). Also, the front lid
1st place! ! (to) and the inner lid (to) are the first when the lid is opened.
As shown in Figure 3, the tape cassette (11) is in a horizontal state at the upper part. Therefore, the tape cassette (11) according to this embodiment can improve the space factor of the cassette mounting position, and is suitable for video tape recorders. It is also suitable for small-sized vehicles.

Also, when the cassette is installed, a lock release pin (103) is provided at the cassette installation position as shown in Figure 10.
is inserted into the bottle hole (104) of the second claw body through the long hole (E) of the lower half (3).This lock release bottle (
105) is linked with an operation button (not shown) of the video tape recorder.For example, when the video player 11', 1 is set to the playback mode, the unlock bin (105) is
03) is the arrow in Figure 10! move in a direction. Side is second
The claw body moves back and forth against the torsion spring υυ from the position shown by the solid line in FIG. 11 to the position shown by the two-dot chain line. At this time, the pair of claw rings of the second claw body are pressed by the ends of the pair of guide plate parts a4) and approach each other, so that the pair of claw rings (
), the ratchet portion 4 of the pair of tape reels t81, t9+, and the ratchet portions (10(S), : of the pair of tape reels 18+, t9+) are engaged with each other very smoothly.

When the second pawl body moves forward to the position indicated by the dashed-dotted line in FIG. - Pressing part (
105) begins to press the suppressed portion of the pair of first claws. When the pawl body of the pawl 2 moves forward to the position shown by the two-dot chain line in FIG. 11, the pair of first pawl bodies - moves forward to the position shown by the two-dot chain line in FIG. The pair of claw parts - and the pair of ratchet parts (10<S) are disengaged, and the pair of tape reels +81t97 is unlocked.

On the other hand, if you put the video table recorder in stop mode,
The unlocking bin (103) moves back to the position shown in solid line in FIG. At this time, when the claw body of $2 moves back to the position shown by the dashed line at the 11th m, the pair of first claw bodies -
is rotated back to the position shown by the solid line in FIG. 11 due to the bias of the torsion spring Qυ, and the pair of pawls and the pair of ratchets (106) first engage. When the claw body of the noodle 2 moves back in the position indicated by the solid line in FIG. f81 (9
+ rotates slightly in the direction of arrow m and the direction of arrow n in Figure 11. Therefore, when only the pair of first pawls are used as in a conventional reel locking device, the pair of first pawls rotate back and engage with both ratchet parts (106). At this time, both tape reels +81 and +91 were rotated slightly in the directions opposite to the arrows m and n directions in Figure #11 and passed along the opening tte (right tape ao), which became slack and warped. However, if the reel lock device 1 is used, such slack in the tape OQI is not affected at all.

When removing the tape cassette (11) from the main body of the video tape recorder, the front cover 07j1 upper cover and inner tic
The operating situation in 19) is completely opposite to the above case, that is, the front cover C3n is rotated in the closing direction by a pair of torsion springs 7 and a pair of tension springs σ, and the upper fi and inner cover 0
(2) are respectively closed in conjunction with the rotation of the front lid C371. Note that the pair of upper r torsion springs (to) are not necessarily necessary when the rotation moment of the upper cover (to) by the pair of tension springs 3 is increased, and the front cover 0η is set by the pair of tension springs υ lowered by H. It can also be rotated in the closing direction.

Although one embodiment of the present invention has been described above, the present invention is not limited to the structure shown in the above embodiment, but can be modified in various ways. Furthermore, the present invention is applicable not only to tape cassettes for video tape recorders, but also to tape cassettes for various other information processing devices.

As described above, in the present invention, the guide groove for guiding the opening/closing operation of the internal vibration is formed in the joining part of the upper half and the lower half of the tape cassette, so even if the guide trout has an inclined part, When molding both the upper and lower halves with a mold, the sloped portion does not become undercut. Therefore, the guide groove can be formed simultaneously with the molding of the tape cassette, and the productivity of this type of tape cassette can be greatly improved.

[Brief explanation of the drawing]

The drawing shows the invention as a videotape recorder. Fig. 1 is a perspective view of the tape cassette when it is not attached, Fig. 2 is a perspective view of the tape cassette when it is attached, and Fig. 3 is a perspective view of the tape cassette. Exploded perspective view of the same as above, Building 4
The figure is a plan view of the same as above, Fig. 5 is a bottom view of the same as above, Fig. 6 is a perspective view of the front cover, upper cover, and inner cover, and Fig. 7 is a station light side for explaining the addition of the upper cover. Figure 8 is an exploded perspective view showing an enlarged front part of the tape cassette, Figures 9a and 9.
Figure b is a horizontal sectional plan view showing the locked state of the front cover, No. 10.
Figure 11 is an exploded perspective view of the locking device, Figure 11 is a plan view of the same as above, Figure 12 is a sectional view taken along the arrow X1l-XI in Figure 4, Figure 13 is a sectional view showing the open state of the same as above, FIG. 14 is an exploded perspective view of the erroneous erasure prevention device, and FIG. 15 is a vertical cross-sectional view of the same. In the symbols used in the drawings, (]1......Tape cassette (21......Tape cassette (21......Top half () 3)
・・・・・・・・・・・・Lower half+8X9)・
・・・・・・・・・・・・Tape reel QG・・・・・・
・・・・・・・・・Magnetic tape 0υ・・・・・・・・・
・・・・・・Guide groove (goods)・・・・・・・・・・・・・・・
・・Front lid (to)・−・・・・・・・・・・・・・Top lid (
To)・・・・・・・・・－・・・・・・Inner lid－・・・・・・
......It is a guided pin. - Agent Masaru Ueya Figure 11 (Command) Procedural Auxiliary Device (Method) 1985 3kA, -4th Mr. Commissioner of the Japan Patent Office■, Indication of the case Showa S6 Patent Application No. 159900 2 Name of the invention Tape Car Dragon Relationship with the Pat Case Patent No. 5'1 Applicant No. 6-7-A, Kitashinyo, Tokyo Parts Co., Ltd. (218) Sony Corporation 6 Number of inventions increased by amendment 7, subject of amendment Drawings

Claims (1)

[Claims] An opening is formed in one side of a tape cassette that has a built-in tape reel and is made up of an upper half and a lower half that are fitted together;
In a tape cassette in which a continuous notch with the opening is formed on the lower surface of the cassette, and the tape of the upper F tape reel is wound along the opening, the front surface of the tape wound along the opening is A front cover that can be freely opened and closed is provided, an inner cover that extends along the back side of the tape and opens and closes in conjunction with the front cover, a guide groove is provided for guiding the opening and closing operation of the inner cover, and the guide groove is the fitting part l of the above upper half and lower half
A tape cassette that is characterized by this structure.