Dynamic magnetic information storage or retrieval – Miscellaneous
Reexamination Certificate
1999-12-09
2001-07-03
Klimowicz, William (Department: 2652)
Dynamic magnetic information storage or retrieval
Miscellaneous
C360S085000
Reexamination Certificate
active
06256169
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an operation mode detection device to detect the operation mode position in the driving mechanism which drives and controls the tape cassette loading and the tape running statuses, such as recording, playing, fast forwarding, rewinding and stop of the magnetic tape in the magnetic recording and reproducing apparatus, and particularly, to a switch structure which enables cleaning of the contact members in the piano-touch type switch used as the operation mode detection device.
2. Description of the Related Art
A magnetic recording and reproducing apparatus (hereinafter referred to as “VTR (Video Tape Recorder)”) carries a tape cassette into the VTR, guides the magnetic tape in the tape cassette to a certain tape running mechanism and the circumference of a cylinder incorporating a rotary head and, according to various operations input from the input means of the VTR, runs the magnetic tape corresponding to the recording, playing, fast forwarding, rewinding or stop mode.
The VTR mechanism which arranges the tape cassette carrying and the magnetic tape running mode is described below with referring to the plan view of
FIG. 4
showing a magnetic tape driving mechanism of the VTR.
FIG. 4
shows the magnetic tape driving mechanism laid out on the back of the VTR chassis only. The driving mechanism comprises a plurality of mechanism members
31
to
55
.
In the figure, on the right side of a chassis
31
in which the magnetic tape driving mechanism of the VTR is placed, an electric motor
32
serving as the driving source is provided. The electric motor
32
is controlled by the operation mode setting means (not shown) for its revolution speed, number of revolutions and revolution direction. Mounted and fixed to the rotational axis of the electric motor
32
is a worm gear
33
, which makes rotations coaxially with the rotational axis of the electric motor
32
. A first gear
34
is engaged with the worm gear
33
. The first gear
34
consists of a large diameter gear
34
a
engaged with the worm gear
33
above and a small diameter gear
34
b
coaxial with the large diameter gear
34
a
. Engaged with the small diameter gear
34
b
of the first gear
34
is a second gear
35
. A bevel gear (not shown) is formed on the flat surface of the second gear
35
. Engaged with the bevel gear on the second gear
35
is a large diameter gear
36
a
of a third gear
36
. The third gear
36
comprises the large diameter gear
36
a
and a small diameter gear
36
b
coaxial with it. Engaged with the small diameter gear
36
b
of the third gear
36
is a large diameter gear
37
a
of a detection gear
37
. The detection gear
37
comprises the large diameter gear
37
a
and a small diameter gear
37
b
coaxial with it. The small diameter gear
37
b
of the detection gear
37
is configured as a pinion and is engaged with a first rack
39
linearly formed at an end of a slider
38
.
In other words, the rotational driving of the electric motor
32
is reduced by the worm gear
33
, the first gear
34
, the second gear
35
, the third gear
36
and the detection gear
37
and transmitted to the first rack
39
and slides the slider
38
in the horizontal direction shown with an arrow in the figure.
Formed on the slider
38
are a sliding guide groove
40
to guide the linear sliding in the horizontal direction, a first guide groove
41
, a second guide groove
42
, and a third guide groove
43
. With the guide grooves
40
to
43
, guide posts
40
′ to
43
′ are mated allowing sliding. The guide post
40
′ is fixed to the chassis
31
. Though details are not shown for the remaining guide posts
41
′ to
43
′, the guide post
41
′, for example is provided with a pinch roller driving lever. When the slider
38
makes sliding operation, the pinch roller driving lever is moved corresponding to the shape of the first guide groove
41
so that the magnetic tape is held between the rotational axis (capstan) of a capstan motor
52
to be described later and the pinch roller so that it can run. Further, the guide post
42
′ of the second guide groove
42
, for example, drives a reel base brake (not shown) and the guide post
43
′ of the third guide groove
43
is, for example, a driving post to drive the tension lever for tape tension adjustment. The guide grooves
41
to
43
and the guide posts
41
′ to
43
′ are not limited to the above functions and they may have other functions. The second gear
35
also works to drive the cassette transfer mechanism for driving the cassette frame on which a tape cassette is placed (not shown) between the tape cassette load/unload position and the reel base position provided on the chassis
31
.
At the other end of the slider
38
, a second linearly formed rack
44
is provided. A small diameter gear
45
a
configured as a pinion to be engaged with the second rack
44
and a fourth gear
45
having a large diameter gear
45
b
coaxial with the small diameter gear
45
a
are also laid out there. Engaged with the large diameter gear
45
b
of the fourth gear
45
is a loading gear
46
a
, with which the other loading gear
46
b
is engaged. To the rotational axes of the loading gears
46
a
and
46
b
, fixed arms
47
a
and
47
b
are mounted and fixed so that the fixed arms
47
a
and
47
b
make rotations in the circumferential direction together with the rotations of the loading gears
46
a
and
46
b
. At the ends of the fixed arms
47
a
and
47
b
, an end of a swing arm
48
a
and an end of a swing arm
48
b
are rotatably mounted respectively. On the other ends of the swing arms
48
a
and
48
b
, magnetic tape pull-out poles
49
a
and
49
b
are planted toward the surface of the chassis
31
(toward the back of the figure) respectively. These magnetic tape pull-out poles
49
a
and
49
b
make sliding guided by loading guide grooves
50
a
and
50
b
formed on the chassis
31
. Placed at the center of the loading guide grooves
50
a
and
50
b
, a cylinder
51
on which the magnetic tape is to be wound.
In other words, when the electric motor
32
makes rotations for driving and slides the slider
38
, the fourth gear
45
engaged with the second rack
44
makes rotations and the loading gear
46
a
engaged with the fourth gear
45
makes rotations clockwise in the figure, and the loading gear
46
b
engaged with the loading gear
46
a
makes rotations counterclockwise in the figure. This causes the fixed arms
47
a
and
47
b
to make rotations clockwise and counterclockwise. The rotations of these fixed arms
47
a
and
47
b
lead the magnetic tape pull-out poles
49
a
and
49
b
at the end of the swing arms
48
a
and
48
b
to make sliding guided by the loading guide grooves
50
a
and
50
b
. In this procedure, the magnetic tape of the tape cassette (not shown) is pulled out by the magnetic tape pull-out poles
49
a
and
49
b
and wound on the cylinder
51
.
Reference numeral
52
in
FIG. 4
indicates a capstan motor, whose revolution speed, number of revolutions and revolution direction are controlled by operation mode setting means (not shown). This is the driving source which drives the magnetic tape to run and drives the reel base of the tape cassette to make rotations. A small diameter belt pulley
53
is fixed to the rotational axis of the capstan motor
52
and a belt
54
is stretched on the belt pulley
53
. The rotational driving of the capstan motor
52
is transmitted to a reel base driving belt pulley
55
by the belt
54
. The reel base driving belt pulley
55
provides the rotational driving to either the tape feeding reel base or the tape winding reel base of the tape cassette (not shown) corresponding to the operation mode.
In short, when the magnetic tape driving mechanism of
FIG. 4
carries and puts the tape cassette to the certain position on the chassis
31
, the rotational driving of the electric motor
32
causes the second gear
35
to make rotations, which drives the tape cassette tran
Klimowicz William
Pillsbury & Winthrop LLP
Toshiba Video Products Japan Co., Ltd.
LandOfFree
Operation mode detection device of magnetic recording and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Operation mode detection device of magnetic recording and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Operation mode detection device of magnetic recording and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2460982