JP2657142B2 - Cassette lid opening mechanism in recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for opening a lid of a tape cassette in a recording / reproducing apparatus such as an 8 mm VTR (video tape recorder) in the process of setting the tape cassette to a recording / reproducing position. is there.

[0002]

2. Description of the Related Art Conventionally, in a VTR, FIG.
As shown in the figure, a slide chassis (20) having a supply reel table and a take-up reel table (not shown) is mounted on a main chassis (10) having a rotary head cylinder (8) with respect to the rotary head cylinder (8). A cassette holder (30) for accommodating and holding a tape cassette (9) is provided on the slide chassis (2) so as to be slidable in the approaching / separating direction. After the vertical movement of the cassette holder (30) as it descends, and the horizontal movement of the slide chassis (20) and cassette holder (30) moving closer to the rotating head cylinder (8), the cassette holder (30) is set at the recording / reproducing position. There is a known loading method.

[0003] The tape cassette (9) has a plurality of positioning holes (93) and (94) on the back surface of the casing (91), and slides with the vertical descent while being held by the cassette holder (30). The positioning pins (23) and (24) projecting from the chassis (20) are fitted into the positioning holes (93) and (94), thereby positioning the tape cassette (9).

On the slide chassis (20), a lid opener (6) for opening and closing the lid (92) of the tape cassette (9) is provided.
The tape cassette (9) is lowered while the tape cassette (9) is held by the cassette holder (30), and a lid opener is attached to the opening / closing lid (92) of the tape cassette (9).
(60) hits, and the tape cassette (9) further descends to the lower end, whereby the opening / closing lid (92) is opened almost completely.
The opening / closing lid (92) of the tape cassette (9) is urged to rotate in the closing direction by a spring (not shown).

[0005]

The lid opening mechanism in the conventional VTR uses only the lowering operation of the tape cassette (9) to open and close the lid (92) against the spring. The repulsive force of the spring increases in accordance with the opening angle of the lid (92), and a large repulsive force is generated in the process from when the open / close lid (92) changes from the half-open state to the substantially full-open state.

However, in this process, the positioning holes (93) and (94) of the tape cassette (9) and the slide chassis (20) are not yet formed.
Since the engagement with the upper positioning pins (23) and (24) is incomplete, the large repulsive force acts on the tape cassette (9), so that the positioning holes (93) and (94) and the positioning pins ( 23) (2
4) may be shifted into an abnormal fitting state, which may hinder the cassette mounting operation.

In particular, in a small cassette type recording / reproducing apparatus such as an 8 mm VTR, as shown in FIG. 3, a tape cassette 9 is set at a recording / reproducing position and an opening / closing lid 92 is provided.
Is opened, the rotary head cylinder (8) penetrates deeply into the opening of the cassette, and the gap A between them is set as small as possible.

However, in the conventional VTR lid opening mechanism, the final opening angle of the opening / closing lid (92) of the tape cassette (9) is defined by the lid opener (60) on the slide chassis (20). The positioning accuracy of the slide chassis (20) depends on the rotating head cylinder (8) and the tape cassette.
The accuracy of the gap A with the opening / closing lid (92) of (9) is affected, and in some cases, they come into contact with each other, which hinders the rotation of the rotary head cylinder (8).

An object of the present invention is to provide a high-precision setting of a gap between a tape cassette opening / closing lid and a rotary head cylinder at a recording / reproducing position without a risk of interfering with a cassette mounting operation. It is to provide a cassette lid opening mechanism.

[0010]

SUMMARY OF THE INVENTION A cassette lid opening / closing mechanism according to the present invention is provided on a main chassis (1) having a rotary head cylinder (8) on a supply reel table (21) and a take-up reel table (2).
A slide chassis (2) having a lid (92) is provided on the main chassis (1) so as to be slidable toward and away from the rotary head cylinder (8). A cassette holder (3) for accommodating and holding a cassette (9) is provided so as to be able to move up and down. When the cassette holder (3) has been completely lowered, the cassette holder (3) and the slide chassis (2) move integrally, The tape cassette 9 undergoes vertical movement following the lowering of the cassette holder 3 and horizontal movement following the approach drive of the slide chassis 2 and the cassette holder 3 to the rotating head cylinder 8. , Used in a recording / reproducing device set at a recording / reproducing position.

The cassette lid opening mechanism is a first lid opener.
(6) and a second lid opener (7). The first lid opener (6) projects from the slide chassis (2) to the elevating transition path of the cassette holder (3), and
With the lowering of (3), the open / close lid (92) of the tape cassette (9) in the cassette holder (3) is opened to a half-open state.

On the other hand, the second lid opener (7) fixes the position of the slide chassis (2) in the horizontal movement direction with respect to the main chassis (1), and rotates the cassette holder (3) and the slide chassis (2). With the horizontal advance to the head cylinder 8, the opening / closing lid 92 of the tape cassette 9 in the cassette holder 3 is opened from the half-open state to the open state.

[0013]

[Function] Tape cassette (9) in cassette holder (3)
When the cassette holder (3) is lowered while the cassette holder (3) is loaded, the first lid opener (6) comes into contact with the end of the opening / closing lid (92) of the tape cassette (9) in this process, and the cassette holder (3) is further moved. By lowering (3) to the lower end, the opening / closing lid (92) of the tape cassette (9) is opened to a half-open state (for example, the opening angle is 60 to 70 degrees).

Thereafter, as the slide chassis (2) and the cassette holder (3) move horizontally, the opening / closing lid (9) of the tape cassette (9) held in the cassette holder (3) is moved.
The second lid opener (7) abuts on (2), and furthermore, the tape cassette (9) in the cassette holder (3) advances to a predetermined recording / reproducing position, thereby opening and closing the tape cassette (9). ) Is opened from the half-open state to the fully-open state (for example, the opening angle is 85 to 90 degrees).

[0015]

In the cassette lid opening mechanism in the recording / reproducing apparatus according to the present invention, the opening / closing lid is only opened to the half-open state with the lowering of the tape cassette. The urging force, that is, the repulsive force acting on the tape cassette is small, and does not hinder the mounting operation of the tape cassette on the slide chassis. or,
Since the opening angle of the opening / closing lid when the tape cassette is set at the recording / reproducing position is defined by the second lid opener on the main chassis, the gap between the opening / closing lid of the tape cassette and the rotary head cylinder can be precisely formed. Is set.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an 8 mm VTR will be described in detail with reference to the drawings. As shown in FIG. 1, on a main chassis (1), a slide chassis (2) having a supply reel table (21) and a take-up reel table (22) approaches a rotating head cylinder (not shown). Separated front-back direction
(Left and right direction in the figure)
Drive mechanism installed between (1) and slide chassis (2)
(Not shown).

A lid (4) is provided on the main chassis (1).
Is pivotally supported at its base end (42), and is disposed so as to be rotatable in the vertical direction. A cassette holder (3) is interposed between the lid (4) and the slide chassis (2). The lid (4) is rotationally biased upward by a torsion spring (not shown) fitted on the pivot (42).

That is, a first pin (31) and a second pin (32) project outward from the side plate (33) of the cassette holder (3), and the first pin (31) is provided with a lid ( The second horizontal pin (32) is slidably fitted in the first horizontal guide hole (43) opened in the side plate (45) of 4).
Is slidably fitted in a vertical guide hole (25) formed in the side plate (26) of the slide chassis (2).

As the lid (4) is lowered, the cassette holder
A link mechanism (5) having a link plate (51) is provided for lowering (3) while maintaining a substantially horizontal attitude and maintaining the horizontal attitude near the lower end. That is, the link plate (51)
, A first pin (52) and a second pin (53) are protruded inward, and the first pin (52) is provided with a second horizontal guide hole (45) formed in a side plate (45) of the lid (4). 44) slidably fits on the second pin (53)
Is slidably fitted in a horizontal guide hole (14) formed in a side plate (13) of the main chassis (1).

The second pin of the cassette holder (3)
(32) penetrates the link plate (51) so as to be relatively rotatable, and the tip of the pin has the vertical guide hole of the slide chassis (2) as described above.
(25). The link mechanism (5) is also provided on the right side of the main chassis (1).

A hook (41) projects downward from the side plate (45) of the lid (4). On the other hand, a slide piece (11) having a horizontal pin (12) with which the hook (41) is to be engaged is supported on the main chassis (1) so as to be slidable within a certain range in the front-rear direction. Along with the spring (not shown) forward (left direction)
Has been energized.

Further, on the slide chassis (2), a first lid opener (6) protrudes at a front end, and at a rear end, a positioning hole (93) () of a tape cassette (9). A pair of left and right positioning pins (23) and (24) to be engaged with 94) protrude. On the other hand, a pair of left and right second lid openers (7) (7) protrudes downward on the back surface of the lid (4).

FIGS. 2A, 2B and 2C show a series of cassette loading operations in the VTR. FIG.
In the state (a), the slide chassis (2) is retracted to the rear moving end, and the lid (4) and the cassette holder are moved.
(3) is rotated to the rising end, and the cassette holder (3)
A tape cassette (9) is inserted from the opening of the tape cassette (9).

When the lid (4) is depressed, as shown in FIG.
In the process up to (b), the cassette holder (3) is
By the operation of (5), the vehicle descends to the vicinity of the descending end while maintaining the substantially horizontal posture. By further pressing down the lid (4), the second pin of the cassette holder (3) is pressed as shown in FIG.
(32) moves to the lower moving end of the vertical guide hole (25) of the slide chassis (2), and the first pin (52) of the link mechanism (5) is a lid.
Move to the right moving end of the second horizontal guide hole (44) of (4),
In this process, the cassette holder (3) is held in a horizontal position, and is set on the slide chassis (2).
The hook (41) of (4) is engaged with the pin (12) on the main chassis (1), and the lid (4) is locked in the closed position.

At the same time, the positioning pins (23) and (24) on the slide chassis (2) are fitted into the positioning holes (93) and (94) of the tape cassette (9), thereby positioning the tape cassette (9). It is. Thus, the mounting of the tape cassette 9 on the slide chassis 2 is completed.

2 (a) to 2 (b), a cover (92) for opening and closing the tape cassette (9) in the cassette holder (3).
At the end of the first lid opener on the slide chassis (2)
The upper end of (6) comes into contact, and as the tape cassette (9) subsequently descends, the opening / closing lid (92) is opened to a half-open state as shown in FIG. 2 (b).

Thereafter, the slide chassis (2) is driven forward by a well-known drive mechanism (not shown), and accordingly, the cassette holder (3) and the tape cassette (9) are moved to the first pin (3) of the cassette holder (3). 31) is in the first horizontal guide hole (43) of the lid (4), and the first pin (52) and the second pin (53) of the link mechanism (5) are in the second horizontal guide hole of the lid (4). The tape cassette (9) in the cassette holder (3) is finally set at a predetermined recording / reproducing position by being guided horizontally by the holes (44) and the horizontal guide holes (14) of the main chassis (1). Is done.

In the process shown in FIGS. 2 (b) to 2 (c), the tape cassette (9) is
The tip of the second lid opener (7) provided in (4) abuts,
As the tape cassette 9 further advances, the tape cassette 9 shown in FIG.
As shown in (b), the opening / closing lid (92) is opened to the fully opened state.

The unloading of the tape cassette 9 is performed by following the reverse of the above-described loading operation. The lock of the lid (4) is released by sliding
This is performed by moving (11) backward by a lock release mechanism not shown.

In the above-mentioned VTR, FIG.
During the vertical movement of the tape cassette (9) shown in
(92) is only opened to the half open state,
(92) spring force in the closing direction, thus the tape cassette
The repulsive force acting on (9) is small, and in the state of FIG. 2 (b), the positioning holes (93) and (94) of the tape cassette (9) and the positioning pins (23) and (24) on the slide chassis (2). There is no danger that the fitting of will be shifted.

In the cassette loading completed state shown in FIG. 2C, the opening / closing lid 92 of the tape cassette 9 is separated from the first lid opener 6 on the slide chassis 2; The opening angle of the opening / closing cover (92) of the tape cassette (9) is defined by the second cover opener (7) whose horizontal position is regulated with respect to the main chassis (1). The gap A between the rotary head cylinder (8) and the opening / closing lid (92) is set with high precision as shown in FIG.

The description of the above embodiments is for the purpose of illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

For example, the second lid opener (7) projects downward on the back surface of the lid (4) in the above embodiment, but may project upward on the main chassis (1). Of course. Further, the second lid opener (7) can be formed of an elastic body.

[Brief description of the drawings]

FIG. 1 shows a VT having a cassette lid opening mechanism according to the present invention.
It is a perspective view which shows the principal part of R.

FIG. 2 is a series of side views showing a cassette loading operation and a cassette lid opening operation.

FIG. 3 is a side view showing a positional relationship between a tape cassette opening / closing lid and a rotary head cylinder at a loading completion position.

FIG. 4 is a perspective view showing a cassette loading operation in a conventional VTR.

[Explanation of symbols]

 (1) Main chassis (2) Slide chassis (3) Cassette holder (4) Lid (6) First lid opener (7) Second lid opener (9) Tape cassette (92) Opening / closing lid

Claims (1)

(57) [Claims] 1. A slide chassis (2) having a supply reel table (21) and a take-up reel table (22) is mounted on a main chassis (1) having a rotary head cylinder (8). The main chassis (1) is provided so as to be slidable in the direction of approach to and separation from the cassette holder (8), and a cassette holder (3) for accommodating and holding a tape cassette (9) having an opening / closing lid (92) can be moved up and down. When the cassette holder (3) is completely lowered, the cassette holder (3) and the slide chassis (2) move integrally, and the tape cassette (9) moves vertically with the lowering of the cassette holder (3). After the horizontal movement of the slide chassis (2) and the cassette holder (3) following the approach drive to the rotary head cylinder (8),
It is used in a recording / reproducing apparatus set at a recording / reproducing position. When the cassette holder (3) is lowered from the slide chassis (2), an opening / closing lid (92) of a tape cassette (9) in the cassette holder (3) is lowered. ) To the main chassis (1) in a cassette lid opening mechanism in which a first lid opener (6) that opens the half-open state from the slide chassis (2) to the cassette holder (3) elevating and lowering transition path. The position of the slide chassis (2) in the horizontal movement direction is fixed, and as the cassette holder (3) and the slide chassis (2) advance horizontally to the rotary head cylinder (8), the inside of the cassette holder (3) is moved. A cassette lid opening mechanism, comprising a second lid opener (7) for opening the opening / closing lid (92) of the tape cassette (9) from the half-open state to the open state.