Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Reexamination Certificate
1999-01-12
2001-11-06
Heinz, A. J. (Department: 2754)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
C360S251100
Reexamination Certificate
active
06313966
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cassette tape deck having a detection gear switching device of a simple structure which allows a detection gear for detecting rotations of reels to be alternately engaged with a selected reel.
2. Description of the Prior Art
Generally, a tape player has a cassette tape deck on which a tape running system including a pinch roller and guide rollers and a cassette loading mechanism including a motor and gears are installed.
A cassette having a magnetic tape therein is guided to a predetermined position of the cassette tape deck by the cassette loading mechanism and is mounted on a take-up reel and a supply-reel.
After the cassette has been mounted on the take-up reel and the supply-reel, selected running operations such as playing, recording, fast forwarding and rewinding are carried out according to the user's choice. At this time, the magnetic tape forwardly or reversely moves along the tape running system according to the driving direction of a capstan motor.
One example of the tape running system is disclosed in U.S. Pat. No. 5,402,289 issued to Hideki Hayashi et al.
FIG. 1
shows a cassette tape deck as disclosed in U.S. Pat. No. 5,402,289.
Referring to
FIG. 1
, when a driving motor
11
installed at a plate
10
is actuated, a mode plate
12
having a cam
12
a
linearly moves so as to turn a play link
13
having a cam follower
13
a
inserted along cam
12
a.
While being turned, play link
13
pushes one of legs of a spring
14
having an inverse U shape. Accordingly, a detection gear
15
moves along a guide groove
10
a
formed at plate
10
and engages with any one of reels
16
, thereby detecting a rotation of engaged reel
16
which rotates clockwise or counterclockwise.
However, the deck of Hideki includes mode plate
12
having cam
12
a
of a complex shape. So, the machining of mode plate
12
is not easy.
In addition, there may be an interference between a plurality of bending portions of cam
12
a
and cam follower
13
a,
resulting in damage thereof.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages. Therefore, it is an object of the present invention to provide a cassette tape deck having a simply structured detection gear switching device.
In order to achieve the above object of the present invention, there is provided a cassette tape deck, comprising: a chassis at which a main motor and a sub motor are installed; a couple of reels installed at the chassis, the reels rotating in an identical direction by the main motor which is alternately actuated in a clockwise or in a counterclockwise direction; a lever provided in a lower surface of the chassis, the lever moving in a first linear direction by the sub motor which is alternately actuated in the clockwise or in the counterclockwise direction; a head plate provided at a top surface of the chassis, the head plate moving in a second linear direction perpendicular to the first linear direction by the lever; a couple of transmission gears installed in the lower surface for transmitting a torque of the main motor to the reels, the transmission gears being engaged with any one of the reel gears by the head plate; a first plate turnably installed in the lower surface of the chassis, the first plate being rotated by the lever; a second plate provided between the chassis and the head plate, the second plate moving in the first linear direction by the first plate; a hinge plate turnably installed at the lower surface of the chassis, the hinge plate turning by the second plate; and a detection gear rotatably installed at the hinge plate for detecting rotations of the reels, the detection gear being alternately engaged with one of the reels by the hinge plate.
The chassis is formed with first and second linear guide grooves for guiding the lever, and the lever includes first and second pins inserted into the first and second linear guide grooves respectively for guiding the lever and preventing the lever from being separated from the chassis.
The first and second pins include first and second bodies penetrating the first and second linear guide grooves respectively and first and second contact pieces extending from the first and second bodies respectively so as to make contact with the top surface of the chassis, upper ends of the first and second linear guide grooves having larger width than diameters of the first and second contact pins respectively such that the first and second pins are separable from the first and second vertical guide grooves.
The head plate is formed at a side portion thereof with a second cam making contact with the second pin, thereby moving the head plate in the horizontal direction.
The lever includes a rack receiving a torque from the sub motor so as to move the lever in the first linear direction.
The lever is formed with a contact pin, and the first plate is formed at a side portion thereof with a first cam making contact with the contact pin so as to turn the first plate.
The first plate is disposed at a portion thereof along a connect pin extending from the chassis so as to turn, and the connect pin is provided at a junction portion to first plate thereof with a connect plate including a center portion of an arcuate shape assembled to the connect pin such that the center portion is spaced apart from the first plate and both end portions making contact with the first plate, the center portion resiliently pulling the connect pin toward the first plate, the end portions pushing the first plate toward the chassis.
The second plate is formed with a projection, and the chassis is formed with a third linear guide groove receiving the projection for guiding the second plate.
The first plate is formed with a groove, and the second plate is formed with a projection penetrating the chassis so as to be inserted into the groove, thereby moving together with the first plate.
The hinge plate moves together with the second plate by a spring.
The spring has a “⊂” shape, an opening portion of which is connected to the second plate and a closed portion of which is connected to the hinge plate, and the spring moving in the vertical direction and simultaneously turning.
The opening portion of the spring is twisted such that a force exerting direction from the second plate to the spring and a force exerting direction from the spring to the second plate are opposite.
The hinge plate is formed with a recess for holding the closed portion of the spring, and the second plate is formed with a latch piece positioned within the opening portion of the spring.
The recess is substantially identical to the closed portion of the spring in shape and is provided with a cover for preventing the spring from separating therefrom.
The cassette tape deck according to the present invention does not require the lever for switching the detection gear to be formed with a complex shape cam, so the structure thereof is very simple.
REFERENCES:
patent: 5363259 (1994-11-01), Narita
patent: 5402289 (1995-03-01), Hayashi et al.
patent: 5452160 (1995-09-01), Sakuma et al.
Daewoo Electronics Co. Ltd.
Heinz A. J.
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