192 clutches and power-stop control – Clutches – Plural clutch-assemblage
Reexamination Certificate
2001-12-10
2004-03-09
Rodriquez, Saul (Department: 3681)
192 clutches and power-stop control
Clutches
Plural clutch-assemblage
C192S0120BA, C192S04100R, C192S055100, C192S056200, C074S354000
Reexamination Certificate
active
06702080
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic recording/reproducing apparatus, and in particular to a clutch device for a magnetic recording/reproducing apparatus which is capable of transmitting power for regularly conveying a tape, regardless of the quantity of the tape, wound around a reel.
2. Description of the Prior Art
FIG. 1
illustrates a tape path conveying structure of a general magnetic recording/reproducing apparatus.
As shown in
FIG. 1
, a supplying reel driving body
1
and a winding reel driving body
21
are installed to drive a supplying reel (not shown) and a winding reel (not shown) of a tape cassette (not shown) at one side of a main chassis (C).
A plurality of posts and guide rollers are provided on the main chassis (C) to guide the path of a tape (T) released from a tape cassette.
A tension post
3
for controlling the tensile force of the travelling tape (T) is installed on a tension arm
4
.
The tension arm
4
is rotated at a predetermined angle according to the tension of the tape (T) on the main chassis (C) centering around a shaft pin
2
, on which the tension arm
4
is elastically supported by a spring
5
.
The tape (T) having passed the tension post
3
is guided by a guide post
6
and transmitted to a full width erasing head
7
.
The full width erasing head
7
removes, in advance, a signal which has been recorded on the tape in a recording mode.
An inertia roller is installed at a position past the full width erasing head
7
to guide the path of the tape (T).
Next, the tape (T) is guided by guide posts
10
and
11
of the supplying and winding side which are moved along loading paths formed at both sides of a rotational head drum
9
.
The guide posts
10
and
11
draw the tape (T) from the inside of the tape cassette, a position indicated by a dotted line as shown in
FIG. 1
, so as to be wound and traveled.
A supplying slant post
12
and a winding slant post
13
are provided next to the guide posts
10
and
11
and in the direction of the rotational head drum
9
, so as to guide the conveyance of the tape (T).
The guide posts
10
and
11
and the slant posts
12
and
13
are installed on respective supplying and winding slant bases
14
and
15
and moved along the loading path.
As shown in
FIG. 1
, the rotational head drum
9
, on which the tape (T) is wound and conveyed, is provided with a rotational head (not shown) for reading a signal recorded on the tape (T) or for recording a signal.
The tape (T) passes the rotational head drum
9
and the slant post
13
and the guide post
11
of the winding side and then passes the audio control head
16
. The audio control head
16
deletes, records and reproduces an audio signal, and records and reproduces a control signal.
A guide post
17
is provided on the main chassis (C), adjacent to the audio control head
16
for controlling the traveling height of the tape (T).
A capstan shaft
18
for providing a traveling force to the tape (T) is installed at a position past the guide post
17
. The capstan shaft
18
is an output shaft of a capstan motor (not shown) installed at the opposite face of the main chassis (C), and the traveling direction of the tape (T) is determined by the rotational direction of the capstan motor.
A pinch, roller
19
is selectively installed to tightly engage the capstan shaft
18
to provide a force for pulling the tape (T).
A winding post
20
is provided adjacent to the location of the pinch roller
19
and the capstan shaft
18
. A winding arm (not shown) is installed and moved at the winding post
20
.
Between the supplying reel driving body
1
and the winding reel driving body
21
, a clutch assembly
22
is installed to drive the supply reel or the winding reel at a certain torque, regardless of the amount of tape (T) wound on the supplying reel or the winding reel, upon receipt of a driving force received from the capstan motor.
An idler gear
24
is installed at a front end of an idler arm
25
which is coaxially installed with the clutch assembly
22
. The idler gear
24
is adopted to selectively engage either the supply reel driving body
1
or the winding reel driving body
21
for transferring a driving force thereto upon receipt of the driving force from the clutch assembly
22
.
A tension brake
27
is wound on the supplying reel driving body
1
with both of its ends fixed to the tension arm
4
. The tension brake
27
controls the rotational speed of the supplying reel driving body
1
according to the operation of the tension arm
4
, thereby controlling the tension in the tape (T).
The construction of the clutch assembly
22
will be described in detail with reference to accompanying
FIGS. 2 and 3
.
As depicted in
FIGS. 2 and 3
, a central shaft
30
is installed on the main chassis C. A driving pulley
32
d
is installed so as to rotate centering around the central shaft
30
. A belt
31
which receives power from the capstan motor is wound around the driving pulley
32
d
for transferring the rotational force of the capstan motor. A cylindrical clutch holder
34
is installed on the driving pulley
32
.
A an up/down gear
36
is installed on the central shaft
30
on the same axis as the driving pulley
32
d
. The up/down gear
36
transmits the power from the capstan motor by selectively engaging the idler gear
24
. Clutch springs
18
,
18
′ are installed to the up/down gear
36
. The clutch springs
18
,
18
′ are wound around the outer circumferential surface of the cylindrical clutch holder
34
. Herein, the lower spring
18
and the upper spring
18
′ are wound in the opposite directions.
According to the rotational direction of the driving pulley
32
d
, for example, when the lower spring
18
is locked and the upper spring
18
′ rubs against the surface of the clutch holder
34
, a slip occurs. Accordingly, the movement of the tape (T) can be performed with a regular torque regardless of the quantity of the tape (T) wound around the reel.
In the meantime, a first gear portion
37
and a second gear portion
37
′ are formed on the up/down gear
36
, the first and the second gear portions
37
,
37
′ reducing and transmitting power by respectively and selectively engaging with gear portions of the idler gear
24
.
The idler gear
24
is rotatably installed on the front end portion of the idler arm
25
, centering around the central shaft
30
, each gear portion (not shown) selectively engaging the first and the second gear portions
37
,
37
′ of the up/down gear
36
. The idler gear
24
transmits the power of the capstan motor to the supplying reel and the winding reel by selectively engaging with the supply reel body
1
and the winding reel body
21
.
However, the above-mentioned conventional magnetic recording/reproducing apparatus has the following problems.
The clutch springs
18
,
18
′ are selectively used for conveying the tape (T) with a regular tension, regardless of the quantity of tape (T) wound around the supply reel and the winding reel in accordance with a traveling direction of the tape (T).
In this use of clutch springs
18
,
18
′, production costs are increased due to the large amount of construction parts. In addition, the operation efficiency of the assembly process is reduced.
SUMMARY OF THE INVENTION
In order to solve above-mentioned problems, it is an object of the present invention to provide a clutch device for a magnetic recording/reproducing apparatus which is capable of reducing production cost and improving the efficiency of the assembly operation by minimizing the number of components.
In order to achieve the above-mentioned object, a clutch device for a magnetic recording/reproducing apparatus is provided which includes a rotating central shaft installed on a main chassis; a driving pulley installed on the rotating central shaft which rotates by receiving power from a driving source and having a cylindrical pulley holder portion; an up/down gear containing a cylindrical gear holder unit havin
Chae You Seok
Hong Sung Pyo
Lee Ji Young
LG Electronics Inc.
Rodriquez Saul
LandOfFree
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