JP3052783B2 - Cassette lid opening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for opening a lid of a tape cassette in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art A conventional tape cassette lid opening apparatus generally has a construction disclosed in Japanese Utility Model Laid-Open No. 59-78564. FIG. 1 shows the configuration and lid opening operation.
1 will be described.

As shown in FIG. 11, a hook-shaped cover opening lever 91 is fixed to a mounting portion 93 provided on the upper portion of a cassette holder 92, and the cassette holder 92 into which the cassette 95 is inserted from the direction of arrow a is inserted into the cassette. When the cassette holder 92 is pulled in the direction of arrow a from the insertion position, the hook portion 91a of the lid opening lever 91 is engaged with the lower end of the front lower end 96a of the front cover 96 of the cassette 95, and then the cassette holder 92 is drawn horizontally in the direction of arrow a. Is vertically moved in the direction of arrow b to the cassette mounting position when the hook 9 of the lid opening lever 91 is moved downward.
In 1a, lift the front lower end 96a of the front lid 96 upward,
The front cover 96 is opened by rotating the front cover 96 about the fulcrum shaft 97 in the direction of arrow c.

[0004]

However, in the conventional lid opening device as described above, when the lid is opened in the process of vertically lowering the cassette holder, the hook portion of the lid opening lever and the front of the lid opening lever are opened at the beginning of opening the cassette front lid. It is necessary to secure a large amount of engagement with the lower end of the front part of the lid in order to prevent improper mounting due to empty swing.However, when the amount of engagement is increased and the hook part of the lid opening lever approaches the fulcrum axis of the front lid of the cassette, the lid opening operation Since the pressure angle in the process increases and the force applied to the cassette lid increases, a large load is applied to the front of the cassette, making it difficult to lower the cassette while keeping it horizontal. In some tape cassettes, there is a problem in that the restriction on the standard is added and the cassette lid cannot be opened by the conventional fixed lid opening lever.

The present invention solves the above-mentioned conventional problems, secures an engagement amount between a hook portion of a lid opening lever and a front lid of a cassette, ensures a smooth cassette insertion operation, and furthermore, supports rotation of the lid opening lever. An object of the present invention is to provide a cassette lid opening device having a degree of freedom in designing a shaft position.

[0006]

The lid opening device of the present invention comprises:
In order to achieve this purpose, tape reel
Rotatable about the support shaft provided at the center, and constantly biased in the lid closing direction
Covering the magnetic tape stretched on the front with the front lid
Place the cassette and record / play back to the tape cassette.
Horizontal between possible position and the loading / unloading position of the tape cassette
And a vertically reciprocating cassette holder
A method for opening the front lid by contacting the front lid is provided.
A lid opening lever having a hook portion for rotating in a direction,
First position where the hook portion is closest to the tape cassette
A first restricting member that contacts the lid opening lever at
The second position where the hook portion is farthest from the tape cassette
And a second regulating member that contacts the lid opening lever.
And the front lid accompanying the vertical lowering operation of the cassette holder
The starting point of contact between the
The lid opening lever on the tape reel side and above from the point
A pivot shaft for the front cover and the hook portion.
At the start of the contact, the lid opening lever is
When the front lid is almost completely opened
In the above, the lid opening lever is attached to the second regulating member.
While being biased and positioned, while the front lid is being opened
, The lid opening lever can rotate without being restricted
Is located above the cassette holder.
Switching the lid open lever regulation in conjunction with the downward movement
This guarantees a reliable lid opening operation.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The present invention, by the configuration described above, the contact point positional relationship of the front lid and the lid opening lever pivot shaft center point and the tape cassette lid opening lever, the lid opening lever of the rotary receive the front lid of the tape cassette At the beginning of opening the front lid, it is rotated in the direction to increase the amount of engagement with the cassette front lid by the reaction force, and abuts on the restricting portion and is regulated. It is assumed that the lid opening operation is performed by contacting with the restricting part at the position where the opening angle of the lid is adjusted within the proper range by rotating and the lid opening operation is performed. It is possible to do .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

First, the configuration of a tray loading type cassette mounting apparatus will be described with reference to FIGS. 9 and 10. A tape cassette 5 having a tape reel 55 mounted thereon is placed on the bottom plate of the cassette holder 3, and its side surface is placed on the side plate 34a of the cassette holder. And 34b, the rear side of the front panel 4
The front surface is surrounded and positioned by the cassette stopper 36 provided on the cassette holder 3 and the guard panel 2. Outside the side plates 34a and 34b of the cassette holder 3, there are tray racks 7a and 7b, and the side plates 34a and 34b of the cassette holder 3 have lifting shafts 35a and 35b so as to engage with the lifting grooves 71a and 71b provided therein. Are attached, and the cassette holder 3 can vertically move by the engagement between them. A guard panel 2 and a front panel 4 are attached to the tray racks 7a and 7b, which together form a tray unit. The tray unit is provided with horizontal grooves (not shown) provided in the tray racks 7a and 7b with side frames 8a and 8b provided on both sides thereof and vertically mounted on a chassis (not shown). Rollers (not shown) horizontally attached to the frames 8a and 8b engage, and the racks 73 formed on the tray racks 7a and 7b are driven by pinions (not shown) to move horizontally on the chassis. The tape cassette 5 is reciprocally movable between a position just above the mounting position on the chassis and a position where the tape cassette 5 is completely ejected from the recording / reproducing apparatus.

In this configuration, the cassette lid opening device is constructed such that the lid opening lever 1 is provided on the support shaft 1 as shown in FIGS.
The hook portion 13 of the lid opening lever 1 is located below the front lid side plate 54 of the tape cassette 5 in a state before the lowering operation of the cassette holder shown in FIG. The center of the spindle 12
a is the front lid side plate 5 during the cassette lowering operation as shown in FIG.
With the contact start point X between the lever 4 and the cover opening lever 1 as a reference point, the tape reel 5 is located on the side where the tape reel 55 is disposed perpendicular to the front surface of the tape cassette 5 and perpendicular to the reference point and perpendicular to the reference point. Are arranged in a range that is on the upper side. The guard panel is provided with a front regulation portion 21 for regulating the rotation of the lid opening lever 1 in a direction approaching the tape cassette and a rear regulation portion 22 for regulating the rotation in a direction away from the tape cassette.

The operation of opening the lid of the tape cassette with the above configuration will be described. First, the tape cassette 5 is pulled into the magnetic recording / reproducing apparatus together with the tray unit while being placed on the cassette holder 3. At this time, as shown in FIG. 1, the hook portion 13 of the lid opening lever 1 is located below the front lid side plate 54 of the tape cassette 5, and the lid opening lever 1 exerts a moment in the direction of arrow d by its own weight. The hook portion 13 and the front lid side plate 54 are abutted against the front regulation portion 21 and the position thereof is regulated with a large engagement amount L secured. The tray unit is fed and fixed to the end point of the horizontal movement while maintaining this configuration.

Next, when the cassette holder starts descending vertically, the hook portion 13 of the lid opening lever 1 comes into contact with the front lid side plate 54 of the tape cassette 1 as shown in FIG. A reaction force F from a spring (not shown) urging the lid 51 in the closing direction starts to be received. In the state of FIG. 2, the lid opening lever 1 described in the above configuration is used.
The lever 1 is further urged toward the front regulation portion 21 by the reaction force F to receive the moment in the direction of the arrow d due to the positional relationship between the support shaft 12 and the contact start point X.
Then, the front lid side plate 54 is opened while keeping the state where the engagement amount L is secured large.

[0013] lid opening progresses up to the state shown in FIG. 3, the positional relationship between the contact point X ₁ of the supporting shaft 12 and the front cover plate 54 lid opening lever 1 of the lid opening lever 1, the lid opening lever 1 in Figure 2 by the reaction force F In order to receive the moment in the direction indicated by the arrow e in the opposite direction, the position is regulated by being biased against the rear regulating portion 22. At this time, the hook portion 13 of the lid opening lever 1 moves in a direction in which the amount of engagement L between the hook portion 13 and the front lid side plate 54 decreases, but the front end of the front lid side plate 54 is moved by the opening operation of the front lid 51. At this time, the engagement amount L is secured by a length that does not cause the lid opening lever 1 to swing.

Thereafter, since the moment in the direction of the arrow e continues to act on the lid opening lever 1, the lid opening operation is performed while the position is regulated by being urged against the rear regulating portion 22.
The lid opening operation is completed in the state shown in FIG.

Next, a reference example of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In the tray loading type cassette mounting apparatus similar to that of the first embodiment, the cassette lid opening apparatus includes a lid opening lever 1 as shown in FIGS.
5 is attached to the guard panel 2 so as to be rotatable about the support shaft 12, and the hook portion 13 of the lid opening lever 1 is attached to the front lid side plate 54 of the tape cassette 5 before the cassette holder shown in FIG. The lower side of the lid opening lever 1 is supported by the guide member 31 provided below the cassette holder 3 so that the engagement amount L between the hook portion 13 and the front lid side plate 54 does not decrease. Position is regulated. The guide member 31 regulates the lid opening lever to the above-described position for a certain period after the cassette holder starts descending, but is set to have a length in the height direction so as to release the regulation thereafter. Further, the guard panel 2 is provided with a rear regulating portion 22 for finally regulating the rotation of the lid opening lever 1 in the direction away from the tape cassette.

The operation of opening the lid of the tape cassette with the above configuration will be described. First, the tape cassette 5 is pulled into the magnetic recording / reproducing apparatus horizontally with the tray unit while being placed on the cassette holder 3. At this time, as shown in FIG. 5, the hook portion 13 of the lid opening lever 1 is located below the front lid side plate 54 of the tape cassette 5, and the lid opening lever 1 exerts a moment in the direction of arrow e by its own weight. The hook portion 13 and the front lid side plate 54 are in contact with the guide member 31 and the position is regulated in a state where the engagement amount L is ensured to be large. The tray unit is fed and fixed to the end point of the horizontal movement while maintaining this configuration.

Next, when the cassette holder starts vertically descending operation, the hook portion 13 of the lid opening lever 1 comes into contact with the front lid side plate 54 of the tape cassette 1 as shown in FIG. A reaction force F from a spring (not shown) urging the lid 51 in the closing direction starts to be received. In the state of FIG. 6, the lid opening lever 1 has a positional relationship between the support shaft 12 of the lid opening lever 1 and the contact start point X in this configuration.
Receives the moment in the direction of the arrow e by the reaction force F and tries to rotate in the direction in which the amount of engagement L between the hook portion 13 and the front lid side plate 54 decreases, but the rotation is restricted by the guide member 31 and the hook portion 13 Then, the front lid side plate 54 is opened while keeping the state where the engagement amount L is secured large.

When the cassette holder 3 is lowered with respect to the lid opening lever 1 and the lid is opened until the state shown in FIG. 7, the regulation by the guide member 31 of the lid opening lever 1 is released, and the support shaft 12 of the lid opening lever 1 and the front lid side plate 54 the positional relationship between the contact point X ₁ of lid opening lever 1, the lid opening lever 1 located is restricted biased against the rear restricting portion 22 for receiving the moment of the arrow e direction by the reaction force F. At this time, the hook portion 13 of the lid opening lever 1 moves in a direction in which the amount of engagement L between the hook portion 13 and the front lid side plate 54 decreases, but the front end of the front lid side plate 54 is moved by the opening operation of the front lid 51. At this time, the engagement amount L is still in the increasing direction of the lid opening lever 1.
The length is secured so that no swing occurs.

Thereafter, since the moment in the direction of arrow e continues to act on the lid opening lever 1, the lid opening operation is performed while the position is regulated by being urged against the rear regulating portion 22, and the lid opening operation is performed in the state shown in FIG. Complete.

As described above, according to the present invention, when the lid is opened in the process of vertically lowering the cassette holder, the lid opening lever is moved by the tape restriction due to the restriction on the standard of the tape cassette and the restriction on the configuration of the cassette mounting mechanism. Even when it is difficult to open the cassette by fixing it in the conventional manner with a sufficient amount of engagement with the front lid of the cassette,
Due to the positional relationship between the center 12a of the pivot shaft of the bar 1 , the front lid side plate 54 of the tape cassette 5, and the contact point of the lid opening lever 1,
The lid opening lever 1 receives the reaction force F received from the front lid 51, and
At the beginning of opening the cover opening lever 1, the moment is applied in the direction of increasing the engagement amount L with the front cover side plate 54, and the opening is urged by the front regulating portion 21 to maintain the engagement amount L sufficiently. In the middle of the lid opening operation, the lid is automatically opened by the reaction force F in response to a moment in a direction opposite to the opening direction, and is rotated by the rear regulating portion 22 so that the pressure angle of the lid opening is performed within an appropriate range. Is performed, the tape cassette 5 can be smoothly mounted on the chassis , and the lid opening lever
Reference numeral 1 designates a reaction force F received from the front lid 51, which acts on the direction in which the amount of engagement L with the front lid side plate 54 is reduced, in a direction in which the front lid 51 starts to be opened. The position of the front lid side plate 5 is regulated by the member 31.
4 to prevent the swinging of the lid opening lever 1 from being missed, and the cassette holder 3 descends vertically to move the guide member 3
After being disengaged from the tape cassette 5, the tape cassette 5 is rotated until it comes into contact with the rear regulating portion 22, and is regulated at a position where the pressure angle for opening the lid is optimum. Mounting is possible.

[0021]

As described above, according to the lid opening apparatus of the present invention, it is possible to provide a cassette lid opening apparatus capable of preventing failure of opening the lid and smoothly mounting the tape cassette on the chassis.

[0022]

[Brief description of the drawings]

FIG. 1 is a side sectional view of a lid opening device according to a first embodiment of the present invention before the lid opening is started.

FIG. 2 is a side sectional view of the lid in an initial stage of opening the lid.

FIG. 3 is a side sectional view of the lid opening device in a later stage of opening the lid according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional side view showing a state where the lid is completely opened.

FIG. 5 is a side sectional view of a lid opening device according to a reference example of the present invention before the start of lid opening.

FIG. 6 is a sectional side view of the lid in an initial stage of opening the lid.

FIG. 7 is a side sectional view of the lid opening device in a later stage of opening the lid according to the reference example of the present invention.

FIG. 8 is a side cross-sectional view when the lid is completely opened.

FIG. 9 is a plan view of a tray-type cassette loading mechanism according to the embodiment of the present invention.

FIG. 10 is a side sectional view of the same.

FIG. 11 is a side view of a conventional lid opening device.

Continuation of the front page (56) References JP-A-63-206943 (JP, A) JP-A-1-15340 (JP, U) JP-A-1-23732 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) G11B 15/665 601

Claims (1)

(57) [Claims] (1) A tape reel is provided inside and provided on a side surface.
A front lid that can rotate around the support shaft and is always biased in the closing direction.
A tape cassette covering the magnetic tape stretched on the front is mounted.
And a position where recording and reproduction on the tape cassette is possible and the
Horizontal and vertical reciprocation between
And a cassette holder that is rotatably provided, and is brought into contact with the front lid so that the front
Lid opening lever having a hook for rotating the lid in the lid opening direction
And the first hook portion where the hook portion is closest to the tape cassette.
A first restricting member that contacts the lid opening lever at a position;
And the second where the hook portion is farthest from the tape cassette
A second restricting member that contacts the lid opening lever at the position
Having the front lid and the front with the vertical lowering operation of the cassette holder
The contact start point of the hook portion is used as a reference point, and
Of the lid opening lever on the tape reel side and on the upper side.
A rotation support shaft is arranged, and when the front lid and the hook portion substantially start contacting, the lid is closed.
The opening lever is biased by the first regulating member and positioned.
When the front cover is substantially opened, the cover is opened.
The lever is positioned by being urged by the second regulating member.
In addition, while the front lid is being opened, the lid opening lever restricts the position.
Open cassette lid characterized by being rotatable without receiving
Device.