JPS62202379A - Tape cassette - Google Patents

Abstract

PURPOSE:To prevent a tape from having a slack at the front part of a case by winding a tape in the cassette case in opposition to a front case so as to be placed in a notch and providing a tape pressing wall opposing to the rear face of the tape and freely slidably in the forward/backward direction. CONSTITUTION:A tape 6 is wound in the cassette case 1 so as to oppose to a front cover 8 and so as to be placed to a notch 3a and a tape pressing wall 9f freely slidably in the forward/backward direction in opposition to the rear side of the tape 6 is provided. Even if the tape placed in the notch 3a has a slack at unloading, the slack of the tape 6 in the notch 3a is pushed into the cassette case 1 from the notch 3a by the front face cover 8 and the tape pressing wall 9f and the tape 6 placed in the notch 3a is made to the state nearly without a slack at storage. Thus, in using the cassette again, a prescribed relation of position is given between the tape 6 placed at the front part of the notch 3a and the tape leadout guide system and the tape 6 is loaded without giving a damage to the guide system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape cassette suitable for use in recording digital signals, such as PCM signals.

BACKGROUND TECHNOLOGY AND PROBLEMS Currently, a PCM recording and reproducing apparatus has been proposed which converts an analog signal such as an acoustic signal into a digital signal, such as a PCM signal, and records (or reproduces) the converted signal on a magnetic tape. Some PCM recording and reproducing apparatuses use a rotating head to achieve a relatively high recording density. In a PCM recording and reproducing apparatus using this rotary head, during reproduction (or recording), a magnetic tape is pulled out from a tape cassette and loaded onto a rotating drum provided with a rotary head, and then reproduction (or recording) is performed.

By the way, in the tape cassette in which this magnetic tape is loaded, if a finger touches the magnetic tape and oil or fat or dust gets on it, a dropout occurs in the playback signal. It is necessary to seal the magnetic tape as tightly as possible to prevent it from sticking. Furthermore, a space is required to insert a guide system so that the magnetic tape can be loaded during playback (or recording).

For this reason, a tape cassette as shown in FIGS. 1 and 2 has been proposed. That is, in Figures 1 and 2, (1
Reference numeral 1 indicates a cassette case, and this cassette case fi+ is composed of a pair of upper halves (2) and lower halves (3) that are joined together by screws. (2a) is the upper half (
2) A transparent window plate provided on the top surface. (4a)
and (4b) are a pair of reel shaft insertion holes (5a) and (5b) that are housed in the cassette case (1) and are rotatably fitted in a pair of reel shaft insertion holes (5a) and (5b) provided at predetermined positions in the lower half (3). This pair of reel hubs (4a)
, (4b) is wound with a magnetic tape (6).

(7a) and (7b) are tape guide columns provided near the left and right side walls facing the front surface, respectively, and the magnetic tape (6) is wound around these tape guide columns (7a) and (7b). This allows the vehicle to travel at a predetermined position on the front surface. (3a) is the tape guide column (7a) and (
The lower half (3) on the back side of the magnetic tape (6) wound on the magnetic tape (7b) is a notch cut out in a substantially rectangular shape over a predetermined width, and this notch (3a) is cut out over a predetermined width. A guide system for drawing out the tape from the recording/reproducing device is inserted into the tape.

(8) are arm parts (8a) and (8) provided on both left and right sides.
b) is a front cover that is rotatably supported toward the front side of the cassette case (11), and the front side of the cassette case (11) is opened and closed by this front surface M (8).

(9) is a substantially U-shaped slider that faces the lower surface and left and right side walls of the lower half (3) and slides in the front-rear direction. Further, (9a) and (9b) indicate that the slider (9) corresponds to the reel shaft insertion hole (5a) and (5b) when the slider (9) is slid backward to open the notch (3a). 9) is a hole for inserting the reel shaft. Note that (10a) and (10b) are positioning holes provided on the lower surface side corresponding to the tape guide columns (7a) and (7b), respectively.

When such a tape cassette is stored, as shown in FIG. 1, the front part of the cassette case (1) is closed by the front cover (8), and the slider (9) is slid forward, so that the notch part (3a), The reel shaft insertion holes (5a), (5b) and positioning holes (LOa), (IQb) are connected to the slider (
9), and the magnetic tape (6) is sealed inside the cassette case (1).

In addition, when in use, the slider (9) is pressed as shown in Figure 2.
slides backward to open the notch (3a) and reel shaft insertion hole (5).
a), (5b) and positioning holes (10a), (
10b) is opened, the front cover (8) is rotated upward, and the magnetic tape (6) is placed on the front surface of the cassette case (1).
is exposed, the notch (3a), and the reel shaft insertion hole (5a)
, (5b) and positioning holes (10a), (10
A guide system, a reel shaft, and a positioning pin are respectively inserted into b), and the magnetic tape (6) is loaded by the guide system to perform predetermined reproduction (or recording).

By the way, in such a tape cassette, the magnetic tape (6) tends to become loose, and the tape drawer is not operated with the magnetic tape (6) wound on the front part of the notch (3a) loosened. When the guide system is inserted into this notch (3a), the magnetic tape (6) and the guide system do not come into contact with each other due to the predetermined positional relationship, and the guide system may damage the magnetic tape (6) or damage the guide system. Therefore, there was a possibility that the magnetic tape (6) could not be loaded.

For this reason, a hub brake mechanism is provided to prevent the reel hubs (4a) and (4b) from rotating inadvertently during storage. However, with just this hub brake mechanism,
Magnetic tape unloaded by recording/playback device (
6) may become loose.

OBJECTS OF THE INVENTION In view of the above, an object of the present invention is to provide a tape cassette which has a simple structure and does not cause slack in the tape at the front surface of the cassette case.

SUMMARY OF THE INVENTION The present invention provides a cassette case having a notch on the front side, a front cover for opening and closing the front side of the cassette case, and a front cover for opening and closing the front side of the cassette case, and a front cover for opening and closing the front side of the cassette case. A tape is wound around the cassette of the present invention, and a tape pressing wall that faces the back side of the tape and is slidable in the front and back direction is provided.
There is an advantage in that the tape is not slackened at the front part of the cassette case with a simple structure.

EXAMPLE Hereinafter, an example of the tape cassette of the present invention will be described with reference to FIGS. 3 to 9.

In FIGS. 3 to 9, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 3, (2) and (3) indicate the upper half and lower half, respectively, and these upper half (2) and lower half (
3) is made of synthetic resin, such as ABS resin, and a tape cassette is obtained by arranging a front cover (8), a slider (9), and a brake body 0υ, which will be described later, at predetermined positions.

Here, the lower half (3) will be explained. This lower half (3) is divided into a substantially rectangular flat plate portion where the reel shaft insertion holes (5a) and (5b) are provided, and left and right side walls and rear wall portions excluding the front portion where the front lid (8) is arranged. It consists of a frame part consisting of. In this case, the left and right side walls and the lower surface of the lower half (3) other than the sliding range of the slider (9) are made thicker by the plate thickness of the slider (9), and the slider (9)
Steps are provided on the left and right side walls and the bottom surface of the lower half (3) corresponding to the sliding range of the lower half (3), so that when the slider (9) is placed on the lower half (3), Avoid creating a step between the slider (9) and the slider (9).

A support wall is provided near the front of the left and right side walls with a step inward by the thickness of the arms (8a) and (8b) of the front cover (8), respectively, and this support wall (2) is A shaft hole is formed to pivotally support a rotating wheel of the front surface M (8), which will be described later, and when the front surface lid (8) is rotated upward, the front surface lid (8)
) A rectangular operator insertion hole is provided at a position where the lower ends of the arm parts (8a) and (8b) on the back side cover the support wall (2), that is, near the upper end of the front side of the support wall. In addition, shielding walls (14
a).

(14b) and (14c) are provided to shield the notch (3a) and the inside of the cassette case (1).

Furthermore, a horizontal groove α parallel to the front and back direction is formed at the upper end of the left and right side walls.
9 are provided respectively, and a slider (
A rectangular sliding guide groove αQ is provided corresponding to the sliding range of 9). In this case, the depth of the lateral groove Q51 and the sliding guide groove α4 is made shallower than the thickness of the arm portions (8a) and (8b) of the front cover (8). <17a) and (17b) are collar portions provided annularly around the pair of reel shaft insertion holes (5a) and (5b). am is a rectangular spring storage section provided in parallel in the front-rear direction at an intermediate position between the reel shaft insertion holes (5a) and (5b), and the frame is a spring lock installed near the front side of this spring storage section Q81. A tension coil spring for biasing a slider (9), which will be described later, is housed in this spring housing portion α, and one end of this tension coil spring is locked to a spring locking pillar α9.

Next, the upper half (2) will be explained with reference to FIGS. 3 and 4. This upper half (2) is connected to the lower half (3)
), it is composed of a substantially rectangular flat plate portion on which the window plate (2a) is placed, and a frame portion consisting of left and right side walls and a back wall portion excluding the front portion where the front cover (8) is placed. . In this case, the external dimensions of this upper half (2) should be changed to the lower half (3).
The outer dimensions should be approximately equal to the outer dimensions when the slider (9) is placed on the upper half (2), the lower half (3), and the slider (9) when assembled, so that there is no difference in level between the upper half (2), the lower half (3), and the slider (9). . aΦ corresponds to the support wall (12) of the lower half (3), and the left and right side walls are stepped inward by the thickness of the arm parts (8a) and (8b) of the front cover (8), respectively. This is a support wall provided to hold the support wall Ql and the butt part of the support wall (13) on the lower half (3) side has a complementary shape. Notch (
It shows a shielding wall provided corresponding to the rear shielding wall (14c) of 3a), and when the upper half (2) and lower half (3) are combined, the shielding wall (14c) on the upper half (2) side is shown. 14d) and the shielding wall (14c) on the lower half (3) side butt against each other, and the notch (3a) and the inside of the cassette case (11) are shielded.

(2La).

(21b), (21c) and (21d) indicate arc-shaped flanges provided corresponding to the annular flanges (17a) and (17b) of the lower half (3), respectively;
) side flange (21a), (21b) and (21c)
, (21d) and the flange (17a) on the lower half (3) side
and (17b), the magnetic tape (6) is wound around the hubs (4a) and (4b), which are loosely fitted so that they can rotate.

In this case, the collar parts (21a), (21b), (2
The heights of 1c) and (21d) will be described later in the brake body αυ
The thickness is approximately equal to the thickness of the part along the upper half (2) of the saw, and the brake body aυ is the flange part (21a), (21b)
, (21c), (21d) so as not to protrude further than the reel hubs (4a), (4b) so as not to adversely affect the magnetic tape (6) wound around the reel hubs (4a), (4b).

(22) is a U-shaped fixing boss provided corresponding to the spring locking column α9 of the lower half (3), and when the upper half (2) and lower half (3) are combined, this fixing boss A spring locking column 0 is located within the opening of (22), and this fixing boss (2
At the end of 2), one end of a tension coil spring, which will be described later, is fixed to the spring locking column α. In addition, (23) is a non-slip uneven part provided near the back of the left and right side walls, and (24) is a substantially V-shaped support recess provided at approximately the center of the left and right side walls, respectively. When the tape cassette is loaded into the recording/reproducing apparatus, this support recess (24) is held by support claws from both left and right directions.

Furthermore, regarding the brake body αυ, see Figure 3 and...
This will be explained with reference to FIG. This brake body αU
a sliding guide plate (Lla) along the inner surface of the upper half (2), and L-shaped arms (llb) and (llc) hanging below both left and right ends of this sliding guide plate (lla). It consists of more. In this case, brake claws (lid) and (lie) are provided on the back side of the sliding guide plate (lla) corresponding to the reel hubs (4a) and (4b), respectively. Furthermore, the reel hub (4a) corresponds to the brake claws (lld) and (lie).

A ratchet wheel is provided on the outer periphery of the upper half (2) of (4b).

In addition, a spring locking portion (lla) is provided at the center of the sliding guide plate (lla).
f), and manipulators (l1g) and (llh) are provided at the ends of the arms (llb) and (llc), respectively.

In this case, a spring (25) for biasing the brake body aυ is locked to the spring engaging part (llf), so that the free end of this spring (25) presses the shielding wall (14d) of the upper half (2). Then, the biasing force of this spring (25) causes the brake pawl (li
d), (lie) is the reel hub (4a), (4
b) Reel hub (4a), (4b) engaged with the pawl wheel
) is locked so that it cannot be rotated. Also, when the brake body 0υ is placed in the cassette case (1, 1), the ends of the operators (l1g) and (llb) are inserted into the support wall ( b)), and when the front cover (8) is rotated upward, the operator (l1g) protrudes as shown in Fig. 5.
, (llb) is the arm part (8a) of the front M (8)
, (8b), the brake body αυ is slid forward against the biasing force of the spring (25), and the brake pawls (lid) and (lie) are pressed against the reel hub (4a).
, move away from the pawl wheel (4b), and move the reel hub (4a).
, (4b) can be rotated.

Further, the front surface M(8) will be explained here. This front cover (8) includes a plate part (8c) for closing the front part of the cassette case (11), arm parts (8a) provided at both left and right ends of this plate part (8C) so as to face each other; (8b) in a substantially U-shape.In this case, when the front cover (8) is rotated to a position where it shoulders the front part, the front cover (8)
The arms (8a) and (8b) cover the left and right support walls (2) of the upper half (2), and when the front cover (8) is in this rotation position, the slider (9) covers the left and right support walls (2) of the upper half (2). 8a
), so that it can be positioned below (8b). or,
A rotation shaft (8d) is provided at a substantially central position inside the arm portions (8a) and (8b). (8e) and (8f) are U-shaped cutout portions in the plate portion (8C) corresponding to the left and right sides of the cutout portion (3a) of the lower half (3), respectively.

Further, the slider (9) will now be explained with reference to FIGS. 3 and 5.

In this example, this slider (9) is set to the lower half (3).
a flat plate part (9c) along the lower surface of the lower half (3), and side plate parts (9d) and (9e) vertically disposed on both left and right sides of the flat plate part (9C) along the left and right side walls of the lower half (3); Notch (3
a) and a tape pressing wall (9f) vertically disposed at the front end of the flat plate part (9c) so as to face the magnetic tape (6) which is located in the inside and wound around the front part of the notch (3a). do. In this case, when the slider (9) is slid forward, the magnetic tape (6 ) so that they face each other at an interval slightly wider than the thickness of the tape pressing wall (9) and when the slider (9) is slid backward
f) is a shielding wall (14c) behind the notch (3a) and (
14d).

(9g) and (9h) are the side plate parts (9d) and (9e), respectively.
), and the bent portions (9g) and (9h) are located within the lateral groove 051 when the slider (9) is placed in the cassette case fi+. Insert the cassette case into the predetermined positions of the left and right side plates (9d) and (9e) corresponding to the sliding guide groove (11) of the lower half (3).
A constriction portion (26) protruding toward the 11 side is provided. The cassette mounting body fil side of this constriction part (26) is formed into a smooth curved surface so that the contact angle with the sliding guide groove (II) is an obtuse angle, and the top part of this constriction part (26) and the sliding guide groove The slider (9) is positioned in the left-right direction of the cassette case (11) by contact with the bottom surface of the aperture part (2).
The vertical position of the cassette case (11) of the slider (9) is determined by the contact between the upper and lower sides of the top of the slider (6) and the side surfaces of the sliding guide groove αe.
indicates a protrusion provided parallel to the front-rear direction near both left and right sides of the flat plate portion (9C), and this protrusion (27) and the aperture portion (26
) is in sliding contact with the cassette case (11).

(91) is a spring locking piece provided corresponding to the spring storage part α of the lower half (3), and (28) is a tension coil spring for biasing the slider (9). By locking one end with the spring locking post 01 of the lower half (3) and locking the other end with this spring locking piece (91), the slider (9) moves forward so as to close the notch (3a). is energized by

The rest of the structure is the same as the tape cassette shown in FIGS. 1 and 2.

According to such a tape cassette, when playback (or recording) is completed and the magnetic tape (6) is unloaded, the guide system and the reel shaft are respectively cut out (3a) and the reel shaft insertion hole (5a). When extracted from (5b), the sixth
As shown in the figure, the magnetic tape (6) located in front of the notch (3a) becomes slack. In this state, the front cover (8) is rotated as shown in FIG.
The front part of the cassette case (1) is closed. At this time, the magnetic tape (6) that was loosened at the front of the notch (3a) is pushed into the rear of the notch (3a) by the front cover (8). Further, when the front cover (8) is rotated to close the front part, the brake body αυ is slid rearward by the biasing force of the spring (25), and the brake pawl (lid) is rotated.

(lie) engages with the ratchet wheels of the reel hubs (4a) and (4b), and the reel hubs (4a) and (4b) are locked so that they cannot rotate.

After that, the slider (91) biased forward by the tension coil spring (28) is slid forward, and the slider (91) is biased forward by the tension coil spring (28).
) closes the cutout (3a), and the magnetic tape (6)
is sealed and preserved. At this time, as shown in FIGS. 8 and 9, the tape pressing wall (9f) provided on the slider (9) moves from the rear part to the front part within the notch (3a), and is loosened in the notch (3a). The magnetic tape (6) that had been loosened is positioned within a small gap between the tape pressing wall (9f) and the front cover (8), and the slackened magnetic tape (6) is removed.
) is pushed into the inside of the cassette case (11) from inside the notch (3a). Therefore, in this state, the magnetic tape (6) located inside the notch (3a) is brought into a state where there is almost no slack. Ru.

In this way, even if the magnetic tape (6) located in the notch (3a) becomes slack during unloading, the loosened magnetic tape (6) in the notch (3a) will be attached to the front cover (8).
The tape is pushed into the cassette case (11) from within the notch (3a) by the tape pressing wall (9[), and the notch (11) is pressed during storage.
The magnetic tape (6) located within 3a) can be made into a state with almost no slack. Therefore, when the magnetic tape (6) is used again, it is possible to maintain a predetermined positional relationship between the magnetic tape (6) located in front of the notch (3a) and the guide system for pulling out the tape. It can be loaded without damaging it.

As described above, according to the tape cassette of this example, the cassette case (11) has a notch (3a) on the front side, and a front cover (8) for opening and closing the front side of the cassette case (1) is provided. A magnetic tape (6) is wound inside the cassette case (1) so as to face the front cover (8) and to be located in the notch (3a), and to face the back side of the magnetic tape (6). Since the tape pressing wall (9f) is provided that can freely slide in the front and back direction, the magnetic tape (6) does not loosen at the front part of the cassette case (11) with a simple structure, and it is easy to use when loading. There is a benefit in being able to obtain something that does not cause any inconvenience.

Incidentally, in the above-mentioned embodiment, a case has been described in which the tape pressing wall (9f) is provided integrally with the slider (9), but the above-mentioned embodiment also applies if the tape pressing wall (9f) is linked to the slider (9). It is easy to understand that similar effects can be obtained. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and can take various configurations without departing from the gist of the present invention.

Effects of the Invention According to the tape cassette of the present invention, it is possible to obtain a tape cassette with a simple structure that does not cause the tape to become loose at the front part of the cassette case and does not cause any inconvenience during loading. There are benefits that can be made.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a tape cassette having a rotatable front cover and a slidable slider, and FIG. 2 is a perspective view showing an example of a tape cassette having a rotatable front cover and a slider. FIG. 3 is an exploded perspective view showing an embodiment of the tape cassette of the present invention; FIG. 4 is a perspective view showing the inside of the upper half of FIG. 3; FIG. 5 is a perspective view showing the inside of the upper half of FIG. FIG. 6, FIG. 7, FIG. 8, and FIG. 9 are route maps used to explain the operation of the main parts of the tape cassette of the present invention. (1) is a cassette case, (2) and (3) are upper and lower halves, respectively, (3a) is a notch, (4a) and (4
b) are reel hubs, (5a) and (5b) are reel shaft insertion holes, (6) are magnetic tapes, (8) are front lids,
(9) is a slider, (9a) and (9b) are reel shaft insertion holes, and (9f) is a tape pressing wall. Figure 4 Zl/ Figure 5 Figure 6 Figure 8 Figure 7 Figure 9

Claims (1)

[Claims] A cassette case having a notch on the front side is provided with a front cover for opening and closing the front side of the cassette case, and a tape is placed inside the cassette case so as to face the front cover and be located in the notch. 1. A tape cassette characterized in that a tape cassette is wound and is provided with a tape pressing wall that faces the back side of the tape and is slidable in the front-back direction.