Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Reexamination Certificate
1998-10-02
2001-07-24
Evans, Jefferson (Department: 2754)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
Reexamination Certificate
active
06266206
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cassette type recording/reproducing apparatus for recording/reproducing information by using a tape cassette, such as a video cassette recorder or the like.
2. Description of the Prior Art
There has been known a conventional technique shown in
FIGS. 1A
to
1
J, which is relating to a cassette type recording/reproducing apparatus such as a video recorder or the like. In the conventional technique shown in
FIGS. 1A
to
1
C, a cassette discharge lever
25
is secured through a vertical supporting pin
26
to a bottom plate
6
a
of a cassette stage
6
so as to be freely rotatable in directions as indicated by arrows f,f′ within a horizontal plane, and a cam driven lever
28
for rotationally driving the cassette discharge lever
25
is secured through a horizontal supporting pin
29
to a side plate
6
b
of a cassette stage
6
so as to be freely rotatable in directions as indicated by arrows g,g′ within a vertical plane. The cam driven lever
28
is rotationally urged in the direction of the arrow g′ by a torsion coil spring
30
to bring the lower end
28
a
of the cam driven lever
28
into contact with the other end
25
b
of the cassette discharge lever
25
from the direction of the arrow g′ at all times. Further, a cam
31
which is located so as to be overlapped with a horizontal movement locus of the lower end
28
a
of the cam driven lever
28
is secured to a chassis side plate
32
.
As shown in
FIG. 1A
, when a tape cassette
1
is inserted into the cassette stage
6
from a cassette insertion port of a front panel (not shown) in a direction of an arrow a, one end
25
a
of the cassette discharge lever
25
is pushed in the direction of the arrow a by a front end
1
a
of the tape cassette
1
, and the cam driven lever
28
is pushed against the torsion coil spring
30
in the direction of the arrow g by the other end
25
b
of the cassette discharge lever
25
.
In course of an eject operation of the tape cassette
1
from a cassette mount position to a cassette insertion position in the direction of the arrow b by the cassette stage
6
, the lower end
28
a
of the cam driven lever
28
is relatively kicked from the direction of the arrow a by the cam
31
as shown in
FIG. 1B
to rotationally drive the cam driven lever
28
in the direction of the arrow g′. Further, as shown in
FIG. 1A
, the other end
25
b
of the cassette discharge lever
25
is pushed in the direction of an arrow f′ by the cam driven lever
28
, and the tape cassette
1
in the cassette stage
6
is pushed in the direction of the arrow a′ by one end
25
a
of the cassette discharge lever
25
, whereby the tape cassette
1
is violently pushed out of the cassette insertion port in the direction of the arrow a′ so that the tape cassette
1
can be easily pulled out at the outside of the front panel.
However, in the above-described prior art, the lower end
28
a
of the cam driven lever
28
is brought into contact with the other end
25
b
of the cassette discharge lever
25
from the direction of the arrow g′ by the torsion coil spring
30
, whereby the lower end
28
a
of the can driven lever
28
is kept to be overlapped with the cam
31
.
Accordingly, in this application, in the course of a loading operation of the tape cassette
1
from the cassette insertion position to the cassette mount position in the direction of the arrow a by the cassette stage
6
, as shown in of
FIG. 1C
, the cam driven lever
28
is once rotated in the direction of the arrow g against the torsion coil spring
30
by the cam
31
, and then the cam driven lever
28
is violently rotated in the direction of the arrow g′ by the torsion coil spring
30
at the instantaneous time when the cam driven lever
28
gets over the cam
31
in the direction of the arrow a, so that the cam driven lever
28
violently collides against the other end
25
b
of the cassette discharge lever
25
from the direction of the arrow g′ and it causes an uncomfortable collision noise “click sound” at all times.
The every-time occurrence of the uncomfortable collision noise as described above causes questions on the quality of products, and thus this is unfavorable. In addition, when the cam driven lever
28
violently collides against the other end
25
b
of the cassette discharge lever
25
from the direction of the arrow g′ in the course of the loading operation of the tape cassette
1
, the cassette discharge lever
25
is rotationally driven in the direction of the arrow f′ which corresponds to the cassette discharge direction, and the tape cassette
1
in the cassette stage is displaced by the one end
25
a
thereof in the direction of the arrow a′ which corresponds to the cassette discharge direction. Accordingly, there occurs such a cassette loading miss that the tape cassette
1
is not accurately engaged with plural cassette positioning pins when the tape cassette
1
is loaded to the cassette mount position. In order to prevent the positional displacement of the tape cassette
1
in the cassette stage
6
, a clamp force in the cassette stage
6
is required to be increased. If the clamp force to the tape cassette
1
in the cassette stage
6
is increased, a strong force is needed when the tape cassette
1
is manually inserted into the cassette stage
6
, and also a strong force is needed when the tape cassette
1
is discharged by the cassette discharge lever
25
for ejection. Therefore, there occurs various problems, for example, the rigidity of the cassette discharge lever
25
and the cam driven lever
28
must be increased.
The present invention has been implemented to solve the above problems, and it has an object to provide a cassette type recording/reproducing apparatus which can beforehand prevent a cam driven lever from violently colliding against a cassette discharge lever in the course of a loading operation of a tape cassette.
There has been also known another conventional technique as shown in
FIG. 1D
, which is relating to a cassette type recording/reproducing apparatus such as a video recorder or the like. In this conventional technique, an opening/closing lid
5
for opening/closing a cassette insertion port
4
of a front panel
3
from the inside is secured to a cassette stage
6
through a supporting pin
7
so as to be freely rotatable in the directions indicated by arrows c,c′, and a cassette press member is constructed by the opening/closing lid
5
.
That is, as indicated by a dotted line in
FIG. 1D
, in such a state that the cassette stage serving as cassette feeding means is returned to a cassette insertion position P
1
corresponding to the inside position of the cassette insertion port
4
from the direction of the arrow a′, the opening/closing lid
5
is rotated in the direction of the arrow c′ to close the cassette insertion port
4
from the inside by the opening/closing lid
5
. In a cassette loading operation, when the tape cassette
2
is inserted from the cassette insertion port
4
into the cassette stage
6
from the direction of the arrow a, the opening/closing lid
5
is pushed and opened in the direction of the arrow c by the tape cassette
2
, and also the tape cassette
2
is pressed and fixed onto the bottom plate
6
a
of the cassette stage
6
by the cassette press force in the direction of the arrow d′ of the opening/closing lid
5
.
Thereafter, the cassette stage
6
is horizontally retracted from the cassette insertion position P
1
into the cassette retract position P
2
in the direction of the arrow a by a cassette loading mechanism (not shown), and then the cassette stage
6
is vertically descended to the cassette mount position P
3
in the direction of the arrow b. When the tape cassette
2
is horizontally loaded to the cassette mount position P
3
, the tape cassette
2
is mounted horizontally onto plural cassette position pins
8
, and the tape cassette
2
is upwardly push
Evans Jefferson
Frommer William S.
Frommer Lawrence & Haug
Ryan Matthew K.
Sony Corporation
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