Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Reexamination Certificate
2001-08-31
2003-12-23
Chen, Tianjie (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
Reexamination Certificate
active
06667847
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present utility model relates to a magnetic tape apparatus into and from which a tape cassette can be smoothly injected and ejected.
2. Related Arts
Conventional magnetic tape apparatus technologies include one described in the Unexamined Japanese Patent Application Publication No. Sho62-121953. An example thereof will be described with reference to FIG.
11
through FIG.
13
. In this example, a pair of right and left guide plates
3
a
and
3
b
are disposed in a standing condition so as to be parallel to each other on a chassis
2
in a housing
1
, and a plurality of guide rods
5
provided on both side surfaces of a tape cassette moving table
4
disposed between the guide plates
3
a
and
3
b
are movably inserted in a plurality of substantially L-shaped guide holes
6
formed through the guide plates
3
a
and
3
b
, so that the moving table
4
is formed so as to be movable in forward and backward directions a and b between a cassette injection position A and a cassette placement position B. Swinging levers
8
pivotally attached to the guide plates
3
a
and
3
b
through pivotal attachment shafts
7
so as to be rotatable in forward and backward directions c and d are engaged with the front guide rods
5
. A worm gear
11
rotated by a drive source (not shown) is engaged with a worm gear
10
formed on a central part of the periphery of a rotating cam
9
disposed on the reverse surface of the chassis
2
so as to be rotatable. A bevel gear
12
formed on an upper part of the periphery of the rotating cam
9
and a gear
13
formed at the base end of the swinging lever
8
are coupled by a gear mechanism
14
with a clutch so as to interlock with each other. Reference numeral
15
represents a top plate disposed so as to hang between the guide plates
3
a
and
3
b.
As shown in
FIG. 13
, a concave groove
8
a
formed at the top end of each swinging lever
8
is engaged with a guide rod
5
, an end of a presser bar spring
16
latched to the swinging lever
8
is engaged with the guide rod
5
, and by the pressure of the presser bar spring
16
, the moving table
4
is prevented from unexpectedly floating up from the cassette placement position B through the guide rod
5
(see the virtual line in FIG.
13
).
In
FIG. 11
, reference numeral
17
represents movable tape guide posts for drawing magnetic tape t out of a tape cassette T and winding the tape t around a head cylinder
18
, reference numeral
19
represents a full-width erase head, reference numeral
20
represents a sound erase head, reference numeral
21
represents a sound and control head, reference numeral
22
represents fixed tape guide posts, reference numeral
23
represents a back tension post, reference numeral
24
represents a capstan, and reference numeral
25
represents a pinch roller.
In the above-described structure, when the tape cassette T is injected into a tape cassette injection slot
1
a
of the housing
1
with the moving table
4
being on standby in the cassette injection position A as shown by the solid line in
FIG. 13
, since the clutch of the gear mechanism
14
is deactivated, the moving table
4
is slightly pushed in the backward direction b by the tape cassette T being injected onto the moving table
4
, the clutch of the gear mechanism
14
is activated by the drive source through the worm gear
11
, the worm gear
10
and the rotating cam
9
based on a detection signal from a detector (not shown) detecting that the moving table
4
is pushed, and the rotating cam
9
and the swinging levers
8
are integrally coupled so as to interlock with each other through the gear mechanism
14
. Thereafter, the swinging levers
8
are rotated in the backward direction d by the drive source, so that the moving table
4
is horizontally moved in the backward direction b along the guide holes
6
and is then vertically moved down to be set in the cassette placement position B (see the virtual line in FIG.
13
). Then, the magnetic tape t is drawn out of the tape cassette T (see the virtual line in FIG.
11
), and an operation such as reproduction is performed.
By pressing an eject button (not shown), the swinging levers
8
are rotated in the forward direction c by the drive source through the gear mechanism
14
and the like based on the eject signal, so that the moving table
4
in the cassette placement position B is vertically moved up along the guide holes
6
and is then horizontally moved in the forward direction a to the cassette injection position A. Then, the tape cassette T is ejected (see the solid line in FIG.
13
).
Showing the condition of coupling between the swinging levers
8
and the pivotal attachment shaft
7
, as shown in
FIG. 14
, by forming a pair of upper and lower concave step portions
33
at each end of the pivotal attachment shaft
7
by cutting, protrusions
7
a
the cross sections of which have a substantially flat rectangular shape are formed between the concave step portions
33
, and engagement holes
8
b
having a flat rectangular shape and formed at the base ends of the swinging levers
8
so as to pass therethrough are engaged with the protrusions
7
a.
[Problems to be Solved]
In the above-described structure, since the distance h from the position of coupling between the pivotal attachment shaft
7
and the swinging levers
8
to the guide rods
5
engaging with the concave grooves
8
a
is long, when a gap is formed between the protrusions
7
a
and the engagement holes
8
b
engaged with each other, the engagement backlash due to the gap is transmitted to the guide rods
5
being enlarged by a relational expression h/g (here, g is the width of the engagement holes
8
b
), so that the swinging levers
8
cannot be rotated in the forward and backward directions c and d in synchronicity with each other. Consequently, while moving in the forward and backward directions a and b, the moving table
4
exhibits a behavior such as inclining to come into contact with the guide plates
3
a
and
3
b
, so that it is difficult to move the moving table
4
in the forward and backward directions a and b as predetermined. As a result, the tape cassette T cannot be smoothly injected or ejected.
Moreover, since the swinging levers
8
are disposed outside the guide plates
3
a
and
3
b
, when the swinging levers
8
are coupled to the pivotal attachment shaft
7
, it is necessary to insert the pivotal attachment shaft
7
into the through holes of the guide plates
3
a
and
3
b
(see
FIG. 12
) and then reliably engage the engagement holes
8
b
of the swinging levers
8
with the protrusions
7
a
of the pivotal attachment shaft
7
so that there is no backlash. This is cumbersome and requires time.
Further, since it is necessary to precisely cut the ends of the pivotal attachment shaft
7
to form the protrusions
7
a
, the cost of production is high.
SUMMARY OF THE INVENTION
In view of the above-mentioned problem, an object of the present utility model is to provide a magnetic tape apparatus into and from which a tape cassette can be smoothly injected and ejected.
[Means for Solving the Problems]
To solve the above-mentioned object, according to the utility model as set forth in Aspect
1
, in a magnetic tape apparatus in which a tape cassette moving table is disposed between guide plates on a chassis so as to be movable in forward and backward directions, a pair of right and left swinging levers pivotally attached to the guide plates are engaged with guide rods provided on the moving plate, and by rotating the swinging levers in forward and backward directions, the moving table is moved through the guide rods in the forward and the backward directions between a cassette injection position and a cassette placement position set between the guide plates; the swinging levers are disposed inside the guide plates, pivotal attachment shafts provided on outside surfaces of the swinging levers are inserted in pivotal attachment holes formed through the guide plates, a coupling shaft is
Chen Tianjie
Funai Electric Co. Ltd.
Rosenthal & Osha L.L.P.
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