JPH07220443A - Tape cassette - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tape cassette lid mechanism, which prevents the guide pin from being pulled out from the rear lid even when the lid of the tape cassette is opened to the maximum and allows the lid to be smoothly closed. To do. [Structure] The guide pin 10d of the upper lid 10 contacts the final end of the upper lid guide groove 2c when the lid is fully opened.
Therefore, even if an attempt is made to open the lid further, the upper lid 10 cannot be moved so that it cannot be opened. At this time, since the guide pin 11c of the rear lid 11 is located in the rear lid guide groove 3b, the guide pin 11c of the rear lid 11 does not come off and the closing operation is smoothly performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette lid mechanism used in a magnetic recording / reproducing apparatus such as a video tape recorder and other various information processing apparatuses.

[0002]

2. Description of the Related Art In recent years, with the increasing density of magnetic recording, tape cassettes and video tape recorders (hereinafter referred to as VTRs)
Is becoming more compact. As a result, V
TR is often used outdoors such as photographing a landscape or a person.

Among them, in consideration of the outdoor use of the tape cassette as well, a two- or three-sheet lid that covers the front surface and the back surface of the tape has been put into practical use as a dust-proof measure.

The above-mentioned conventional tape cassette will be described below with reference to the drawings. 9 and 10 show a perspective view of a conventional tape cassette assembly and a cross-sectional view of a main part of a lid portion, a tape 17 is stretched over the front surface of the tape cassette 16, and a front lid 18 is always provided. It is covered by an upper lid 19 and a rear lid 20.

A pair of fulcrum pins 18a are provided on the side plate of the front lid 18.
Is provided, and the fulcrum pin 18a is inserted into both front side surface portions of the upper half 21. The front lid 18 is the fulcrum pin 1
It is rotatable about 8a. Also, front lid 1
A pair of pin holes 18b are formed in the upper part of the front surface of the side plate 8.

A pair of support pins 19a is provided on the front surface of the side plate of the upper lid 19, and the support pins 19a are inserted into the pin holes 18b of the front lid 18 and are rotatable.

An upper lid guide groove 21a is formed in the front side surface of the upper half 21, and a pair of guide pins 19b formed on a side plate of the upper lid 19 are slidably attached.

Inside the upper lid 19, a pair of bracket portions 1 are provided.
9c are provided, and pin holes 19d are formed in each bracket portion 19c.

A pair of support pins 20a is provided on the side surface of the rear lid 20.
Is provided, and the pair of support pins 20a is rotatably attached to the pin hole 19d of the bracket portion 19c of the upper lid 19. Further, the guide pin 2 is provided on the lower side surface of the rear lid 20.
0b are formed respectively.

A pair of rear lid guide grooves 22b are provided behind the pair of tape guides 22a formed on the lower half 22 and on both side surfaces of the opening. The guide pin 20b of the rear lid 20 is slidably inserted into the rear lid guide groove 22b.

When the above-mentioned tape cassette 16 is inserted into the apparatus, the front lid 18 is opened by the opening pin 23 arranged on the apparatus side.
Since the side plate of is pushed up, the front lid 18 rotates upward. At this time, the upper lid 19 connected to the front lid 18 is guided by the upper lid guide groove 21a, and the rear lid 20 connected to the upper lid 19 is opened while being guided by the rear lid guide groove 22b. Note that the lid closing operation is completely opposite to the above-described operation.

[0012]

However, the above-mentioned structure has the following problems.

When the tape cassette 16 is attached to the apparatus, the lids 18 and 1 of the tape cassette 16 are used as the apparatus side.
It is trying to reduce the size of the device by pushing 9 and 20 to the maximum to allow a large margin in the height direction of the opening for receiving the tape pull-out post of the device and inserting a cylinder or the like into the opening.

Therefore, as shown in FIG. 11, the guide pin 20b of the rear lid 20 is displaced from the rear lid guide groove 22b, and when the lid is closed, the guide pin 20b hits the upper surface of the upper half 21 and the lid is not closed. Was there. Therefore, if the tape cassette 16 cannot be ejected from the device when the tape cassette 16 is not closed,
If the tape cassette 16 is forcibly taken out, the device and the tape cassette 16 are damaged, which is a big problem.

As a countermeasure against this, as shown in FIG. 12, the width dimension C of the open portion 22c above the rear lid guide groove 22b is formed to be slightly smaller than the diameter D of the guide pin 20b (C
<D) prevents the guide pin 20b from coming off.

However, in the above configuration, the tape cassette 16
There is a problem that it is difficult to assemble because the guide pin 20b needs to be pushed in when the guide pin 20b is inserted from the opening 22c of the rear lid guide groove 22b. In addition, there is a problem that the guide pin 20b is damaged when it is pushed.

In view of the above-mentioned problems, the present invention provides a tape cassette that prevents the guide pin from being pulled out from the rear lid and allows the lid to be smoothly operated even when the lid of the tape cassette is opened to the maximum extent.

[0018]

In order to solve the above problems, in the tape cassette of the present invention, the position regulation when the lid is opened to the maximum is regulated by the side plate portion of the upper lid and the notch portion of the cassette body. It is configured to do.

[0019]

According to the present invention, the side plate portion of the upper lid and the notch portion of the cassette body come into contact with each other when the lid of the tape cassette is fully opened. At this time, since the guide pin of the rear lid is positioned in the rear lid guide groove, the guide pin can be prevented from coming off and the lid can be smoothly closed.

Therefore, it becomes easy to take out the tape cassette from the apparatus, and it is possible to prevent the accidental damage to the tape cassette and the apparatus due to the defective ejection of the tape cassette from the apparatus.

[0021]

EXAMPLES Examples of the present invention will be described below.

FIGS. 1 and 2 are an assembly perspective view and a disassembled perspective view of a tape cassette according to one embodiment.
FIG. 4 is an assembled perspective view of a lid part.

As shown in the drawing, the cassette body constituting the tape cassette 1 is composed of a rectangular upper half 2 and a lower half 3 formed of synthetic resin. Then, the upper half 2 and the lower half 3 are fitted to each other from above and below,
It is screwed with a set screw 4 to form an integral casing. The cassette body also houses a pair of reels 6 around which the tape 5 is wound. On the front surface of the cassette body, an opening 7 for inserting a tape pull-out member on the device side is inserted.
Is provided. A pair of tape guides 3a integrally formed with the lower half 3 are provided on both sides of the opening 7 of the lower half 3, and the tape 5 is guided by the tape guides 3a and extends along the opening 7. It is stretched.

As shown in FIG. 2, the front lid 8 is composed of a front lid portion 8a for covering the front surface of the tape 5 stretched over the opening portion 7 and a side plate 8b for covering the front side surfaces of the upper and lower halves 2 and 3. It has a roughly U shape. The side plate 8b of the front lid 8 is provided with a pair of fulcrum pins 8c, and the fulcrum pins 8c are inserted into a pair of notches 2a provided on both front side surfaces of the upper half 2. The front lid 8 is rotatable around the fulcrum pin 8c. A coil spring 9 is attached to one side of the fulcrum 8c to constantly bias the front lid 8 in the closing direction. In addition, a pair of pin holes 8d are formed in the upper portion of the front surface of the side plate 8b of the front lid 8.

The upper lid 10 is a tape 5 stretched over the opening 7.
The upper lid portion 10a that covers the upper surface of the upper half 2 and the side plate 10b that covers the side surface of the upper half 2 are configured. A pair of support pins 10c is provided inside the front surface of the side plate 10b of the upper lid 10, and the support pins 10c are inserted into the pin holes 8d of the front lid 8 and are rotatable.

An upper lid side plate 10b is provided in front of a side surface of the upper half 2.
A pair of cutouts 2 cut into almost the same size as the thickness of the
b is provided. The notch 2b is formed with a pair of upper lid guide grooves 2c each having a curved portion and a straight portion, and one end of which is an open portion.
A pair of guide pins 10d formed on the inner rear side of the upper lid 10 side plate 10b is slidably attached to c.

As shown in FIG. 3, the upper lid portion 10a of the upper lid 10 is shown.
A pair of bracket portions 10e having a distance substantially equal to the width dimension of the opening portion 7 is provided on the inside of, and pin holes 10f are formed in each of the bracket portions 10e.

As shown in FIG. 2, the rear lid 11 covers the back surface of the tape 5 stretched over the opening 7. And the back lid 1
1 is provided with a pair of support pins 11a on the upper side surface thereof.
It is rotatably attached to the pin hole 10f of 0e. A pair of protrusions 11b is provided on the lower side surface of the rear lid 11, and the guide pins 11c are further provided on the protrusions 11b.
Are formed respectively.

Behind the pair of tape guides 3a formed on the lower half 3 and on both side surfaces of the opening 7, there are provided a pair of rear lid guide grooves 3b having open upper portions. A pair of guide pins 11c formed on the protruding portion 11b of the rear lid 11 are slidably inserted into the rear lid guide groove 3b.

The side wall of the lower half 3 is provided with a slit 3c, and the lid lock member 12 is provided in the slit 3c.
Is attached. FIG. 4 is a side view of a main part of the lid lock part. The lid lock member 12 includes a lock claw 12a that engages with a protrusion 8e attached to the inside of the side plate 8b of the front lid 8,
An abutment portion 12b, which comes into contact with a lid lock releasing member, which will be described later, and a fulcrum pin 12c are integrally formed of synthetic resin. Then, the fulcrum pin 12c is inserted into a pin insertion hole 3d provided in the lower half 3 to be rotatable in the front-rear direction. The lid lock member 12 is biased forward by pressing the rear portion of the lid lock member 12 by one end of the leaf spring 13. As a result, the projection 8e of the front lid 8 and the lock claw 12a of the lid lock member 12 are always engaged, so that the front lid 8 is locked in the closed state.

The detailed structures of the front lid 8, the upper lid 10 and the rear lid 11 have been described above. When these are assembled, the rear lid 11 is first placed in the pin hole 10f of the bracket portion 10e of the upper lid 10 as shown in FIG. The support pin 11a is attached, and then the support pin 10c of the upper lid 10 is attached to the pin hole 8d of the front lid 8 to assemble the lid unit.

The guide pin 10d of the upper lid 10 of the lid unit is connected to the opening 2d of the upper lid guide groove 2c of the upper half 2.
And the fulcrum pin 8c of the front lid 8 is inserted into the cutout portion 2a of the upper half 2.

Next, the upper half 2 and the lower half 3 to which the lid unit is attached are fitted together. At this time, as shown in FIG. 5, the guide pin 11c of the rear lid 11 is inserted from the opening 3e provided in the upper portion of the rear lid guide groove 3b of the lower half 3.

The tape cassette 1 constructed as described above
The operation will be described below. When the tape cassette 1 is inserted into the apparatus, the lid lock releasing member 14 of the cassette holder arranged on the apparatus side hits the abutting portion 12b of the lid locking member 12 and moves in the A direction as shown in FIG.
Therefore, the lock claw 12a of the lid lock member 12 and the projection 8e of the front lid 8 are disengaged from each other, and the front lid 8 is unlocked.

Thereafter, the tape cassette 1 is shown at B in FIG.
When it is moved in the direction, the opening pin 15 placed on the device side
Thereby, the side plate 8b of the front lid 8 is pushed up. Therefore, the front lid 8 rotates upward against the coil spring 9. At this time, the upper lid 10 connected to the front lid 8 is guided by the upper lid guide groove 2c, and the rear lid 11 connected to the upper lid 10 is opened while being guided by the rear lid guide groove 3b. as a result,
The tape 5 stretched over the opening 7 is exposed, and the tape 5 is pulled out and wound around a rotary head drum to record and reproduce video signals and the like. Note that the lid closing operation is completely opposite to the above-described operation.

Next, when the lid of the tape cassette 1 as described above is opened to the maximum, the guide pin 10d of the upper lid 10 is in contact with the final end of the upper lid guide groove 2c as shown in FIG. Therefore, even if an attempt is made to open the lid further, the upper lid 10 cannot be moved so that it cannot be opened. At this time, since the guide pin 11c of the rear lid 11 is located in the rear lid guide groove 3b,
The guide pin 11c of the rear lid 11 does not come off and the lid closing operation is smoothly performed. Further, at the time of assembling the cassette, the width dimension of the opening 3e of the rear lid guide groove 3b can be formed larger than the diameter of the guide pin 11c as shown in FIG. 5, so that the guide pin 11c can be easily inserted and assembled.

Therefore, when the lid of the tape cassette is maximally opened in the conventional device, the guide pin of the rear lid is disengaged from the rear lid guide groove and is caught by the upper surface of the upper half so that the lid cannot be closed. , The tape cassette cannot be taken out from the device, and if the tape cassette is forcibly taken out, the tape cassette and the device will be damaged. In addition, when the tape cassette is assembled, the guide pin of the rear lid and the lower half rear lid guide groove can be easily inserted and assembled.

In the above description, the position of the maximum opening is restricted by the guide pin 10d of the upper lid 10 and the upper lid guide groove 2c of the cassette body, but the diameter of the guide pin 10d cannot be large if the cassette size is small. Guide pin 1
Pin breakage may occur due to insufficient strength of 0d. At that time, as shown in FIG. 8, the end surface 10g of the side plate 10b of the upper lid 10 is
The position is restricted by the end surface 2e of the upper half 2 cutout portion 2b. At this time, since the guide pin 10d has not reached the final end of the upper lid guide groove 2c, a large load is not applied to the guide pin 10d, so that no pin breakage occurs. In addition, the effect of preventing the guide pin from coming off the rear lid is also produced.

[0039]

As described above, according to the present invention, the position regulation when the lid is opened to the maximum is regulated by the side plate portion of the upper lid and the notch portion of the cassette body.

Therefore, when the lid of the tape cassette is opened to the maximum, the side plate portion of the upper lid and the cutout portion of the cassette body come into contact with each other. At this time, since the guide pin of the rear lid is located in the rear lid guide groove, the guide pin can be prevented from coming off and the lid can be smoothly closed.

Therefore, it is easy to take out the tape cassette from the apparatus, and it is possible to prevent a damage accident of the tape cassette and the apparatus due to the defective ejection of the tape cassette from the apparatus.

[Brief description of drawings]

FIG. 1 is an assembled perspective view of a tape cassette according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the tape cassette.

FIG. 3 is an assembled perspective view of the tape cassette lid portion.

FIG. 4 is a side view of the main part of the tape cassette lid lock part.

FIG. 5 is a side view of assembling the lid portion and the cassette body of the tape cassette.

FIG. 6 is a side view of a main part of a tape cassette lid lock part when the tape cassette is inserted into a cassette holder.

FIG. 7 is a cross-sectional view of essential parts when the tape cassette lid is fully opened.

FIG. 8 is a side view of the main part when the tape cassette lid is fully opened.

FIG. 9 is an assembled perspective view of a conventional tape cassette lid portion.

FIG. 10 is a sectional view of a main part of the tape cassette lid portion.

FIG. 11 is a sectional view of an essential part when the tape cassette lid is fully opened.

FIG. 12 is a side view of the assembly of the lid portion and the cassette body of the tape cassette.

[Explanation of symbols]

 2c Upper lid guide groove (upper half) 2e Notch end surface (upper half) 3b Rear lid guide groove (lower half) 8 Front lid 10 Upper lid 10d Guide pin 10g Side plate end surface 11 Rear lid 11c Guide pin

Claims (2)

[Claims] 1. A cassette main body having an opening for inserting a tape pull-out member on the apparatus side formed on the front surface, a tape stretched over the opening by a tape guide provided on the front surface of the cassette main body, and A front lid that is rotatably attached to the cassette body to cover the front surface, an upper lid that is rotatably attached to the front lid to cover the upper surface of the tape, and a pivot to the upper lid to cover the rear surface of the tape. A tape cassette having a rear lid freely attached, wherein the front lid, the upper lid, and the rear lid are configured to rotate in the opening direction in association with each other when the lid is opened. A guide pin is provided and an upper lid guide groove for guiding the guide pin is provided in a cutout portion on the side surface of the cassette main body to regulate the position when the lid is opened to the maximum with the side plate portion of the upper lid. A tape cassette characterized by being configured so as to be regulated by a notch portion of the cassette body. 2. The tape cassette according to claim 1, wherein the position regulation when the lid is fully opened is regulated by the guide pin of the upper lid and the upper lid guide groove of the cassette body.