Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Reexamination Certificate
1996-09-19
2001-01-09
Renner, Craig A. (Department: 2754)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
C360S085000, C242S338400
Reexamination Certificate
active
06172841
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a recording and/or reproducing apparatus such as a video tape recorder (VTR) and, more particularly, to a sliding mechanism for sliding a cassette chassis on which a tape cassette is set.
2. Description of the Related Art
In this kind of recording and/or reproducing apparatus, for the purpose of reducing its entire size, a slidable chassis on which a tape cassette is set is slidably supported on a main chassis provided with a rotary drum, so that the slidable chassis is moved toward and away from the main chassis.
FIG. 8
diagrammatically shows a conventional recording and/or reproducing apparatus, particularly an arrangement example of a slidable-chassis sliding mechanism and its associated constituent components. As shown in
FIG. 8
, a rotary drum
1
is rotatably supported on a main chassis
2
, and a slidable chassis
5
is supported for sliding movement on the main chassis
2
within a predetermined stroke (refer to a double-headed arrow A). A slide arm
4
is turnably supported on the main chassis
2
by a pin
2
d
, and is connected to a cam gear
3
by a pin
4
a
which is engaged with a cam slot of the cam gear
3
. The slide arm
4
, which is driven to turn about the pin
2
d
in interlocking relationship to the cam gear
3
, and the slidable chassis
5
are pin-connected by a connecting pin
4
b
through a slot
10
of a member affixed to the slidable chassis
5
by fittings
11
, so that the slidable chassis
5
is slid by the rotation of the cam gear
3
.
In the example shown in
FIG. 8
, the connecting pin
4
b
which connects the slide arm
4
and the slidable chassis
5
is engaged with a slot portion (or slot)
10
formed in the slidable chassis
5
. In this case, the slot portion
10
consists of a separate constituent component which is positionally adjustably secured to the slidable chassis
5
by screws
11
.
In the example shown in
FIG. 9
, a slot portion
10
′ with which the connecting pin
4
b
is engaged is provided on the slidable chassis
5
by outsert molding.
However, the conventional recording and/or reproducing apparatus has a number of problems. In the case of the example shown in
FIG. 8
, since the slot portion
10
need be prepared as a separate constituent component, not only does the number of constituent components increase but also the number of steps required for positioning and fixing the slot portion
10
increases. This leads to an increase in cost.
The structure shown in
FIG. 9
involves the risk of producing a play between the main chassis
2
and the slidable chassis
5
at either end of the travel stroke of the slidable chassis
5
because of the presence of a positional tolerance of the connecting pin
4
b
due to permissible variations in the dimensions of constituent components. If a play occurs during recording or reproduction, a slack in tape will occur, so that a recording/reproduction failure may occur. If a play occurs during cassette unloading, a variation will occur in the standby position of a guide post, such as a tension arm, which performs a cam operation according to the position of the slidable chassis
5
, as shown in FIG.
9
. The guide post whose standby position has varied may come into contact with and give damage to the tape.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a recording and/or reproducing apparatus which can securely eliminate the play between a main chassis and a slidable chassis to enable appropriate operation of the apparatus.
To achieve the above object, in accordance with one aspect of the present invention, there is provided a recording and/or reproducing apparatus having a rotary drum which comprises a first chassis on which the rotary drum is provided, a second chassis which is supported for sliding movement on the first chassis within a predetermined stroke, an arm rotatably provided on the first chassis and having a pin at its one end, the pin being engaged with a slot, which is provided in the second chassis, so that the arm slides the second chassis, a driving member for turning the arm in such a manner that an amount of travel of the pin in a travelling direction of the second chassis is made slightly greater than a sliding stroke of the second chassis, and an elastic member provided around the slot and capable of coming into abutment with the pin while allowing the pin to travel, when the second chassis reaches an end of the sliding stroke.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description of a preferred embodiment of the present invention, taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5361180 (1994-11-01), Yamabuchi et al.
patent: 5426546 (1995-06-01), Tomitaka et al.
patent: 5459626 (1995-10-01), Lee et al.
patent: 5608589 (1997-03-01), Kang et al.
patent: 4-283464 (1992-10-01), None
patent: 5-210899 (1993-08-01), None
Canon Kabushiki Kaisha
Renner Craig A.
Robin Blecker & Daley
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