Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – With particular drive
Reexamination Certificate
2001-12-10
2004-03-16
Matecki, Kathy (Department: 3654)
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
With particular drive
Reexamination Certificate
active
06705557
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic recording/reproducing apparatus, and more particularly, to an idler device of a magnetic recording/reproducing apparatus in which an idler gear is selectively rotated to be in contact with a supply reel according to a rotational direction of an idler gear.
2. Description of the Background Art
FIG. 1
illustrates a tape travelling structure of a general magnetic recording/reproducing apparatus.
As shown in
FIG. 1
, a supply reel driving body
1
and a winding reel driving body
21
are installed to drive a supply reel (not shown) and a winding reel (not shown) of a tape cassette (not shown) at one side of a main chassis.
A plurality of posts and guide rollers are installed on the main chassis (C) to guide travelling of a tape (T) released from a tape cassette.
A tension post
3
for controlling a tensile force of a travelling tape (T) is installed at 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
, for 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 travelling 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
draws the tape (T) from the inside of the tape cassette, the position indicated in a dotted line as shown in
FIG. 1
, so as to be wound and traveled.
A supply slant post
12
and a winding slant post
13
are provided next to the guide posts
10
and
11
toward the rotational head drum
9
, so as to guide the traveling of the tape (T).
The guide posts
10
and
11
and the slant posts
12
and
13
are installed on a supply 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 traveled, is provided with a rotational head (not shown) for reading a signal recorded on the tape (T) or 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
performs deleting, recording and reproducing of an audio signal, and recording and reproducing a control signal.
A guide post
17
is provided on the main chassis (C) at an adjacent location of the audio control head
16
to control 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 passing 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 a traveling direction of the tape (T) is determined depending on the rotational direction of the capstan motor.
A pinch roller
19
is installed selectively tightly-attached to the capstan shaft
18
to provide a force for pulling the tape (T).
A winding post
20
is provided at an adjacent 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 supply 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 the tape (T) wound on the supply reel or the winding reel upon receipt of a driving force 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 selectively connected to either the supply reel driving body
1
or the winding reel driving body
21
for transferring a driving force thereto upon receipt of a driving force from the clutch assembly
22
.
A tension brake
27
is installed wound on the supply reel driving body
1
with its both ends fixed at the tension arm
4
. The tension brake
27
controls the rotational speed of the supply reel driving body
1
according to the operation of the tension arm
4
, thereby controlling a tension of the tape (T).
The construction of the idler unit including the idler arm
25
and the idler gear
24
will now be described with reference to FIG.
2
.
First, the idler arm
25
is installed centering around the clutch shaft
22
′ installed penetrating the main chassis (C) The idler arm
25
is positioned at an upper surface of the main chassis (C) and the clutch assembly
22
is installed at the lower surface of the main chassis (C). The clutch shaft
22
′, the center of the rotation of the clutch assembly
22
, is installed penetrating from the lower surface to the upper surface of the main chassis (C) and fixed as a washer
25
w
is inserted at the end portion of the clutch shaft
22
′.
The idler gear
24
is installed at the front end portion of the idler arm
25
, so as to be rotatable centering around an idler shaft
24
p.
An idler spring
25
s
is installed between the idler arm
25
and the idler gear
24
. The idler spring
24
s
supported by the idler gear
24
is mounted on a friction member
24
f
installed at the idler gear
24
.
The idler spring
24
s
is operated so that the idler arm
25
can be rotated centering around the clutch shaft
22
′ according to the rotational direction of the idler gear
24
.
That is, according to the rotational direction of the idler gear
24
, the idler gear
24
is selectively engaged with the supply reel driving body
1
or the winding reel driving body
21
to transfer the driving force of the capstan motor.
Reference numerals
24
g
denotes a large gear and
24
g′
denotes a small gear.
However, the idler unit of the conventional art has many problems.
That is, first, in installing the idler arm
25
at the upper surface of the main chassis (C), it is to be assembled together with the clutch assembly
22
.
Namely, in a state that the clutch assembly
22
is positioned at the lower surface of the main chassis (C) and the idler arm
25
is positioned at the upper surface of the main chassis (C), the washer
25
w
is to be engaged at the end portion of the clutch shaft
22
′. Thus, the assembly working is relatively complicated.
Secondly, for the installation of the idler arm
25
, the washer
25
w
is necessarily used, creating a problem that the parts for the assembly are relatively increased in number, which results in that a production cost is accordingly increased and the number of assembly working is relatively increased.
Thirdly, in stalling the idler gear
24
at the idler arm
25
, the idler shaft
24
p
is to be installed after positioning the idler spring
24
s
in a state of a provisional assembly between the idler arm
25
and the idler gear
24
. Thus, the assembly operation is relatively complicated.
Fourthly, in the assembly process, if the idler spring
24
s
allowing an elastic force for the idler gear
24
which is rotated between the friction member
24
f
and the idler arm
25
is not installed at the right position, the idler gear
24
is not properly operated.
Lastly, since the number of parts for operation of the idler gear
24
is relatively many, its production cost is increased and the process number of the assembly working is relatively increased.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide an idler device for a magnetic recording/reproducing apparatus that is capable of minimizing the number of parts and facilitating an assembly working.
Another object of the present invention is to prov
Chae You Seok
Hong Sung Pyo
Lee Ji Young
Birch & Stewart Kolasch & Birch, LLP
Haugland Scott J.
LG Electronics Inc.
Matecki Kathy
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