Magnetic recording and reproducing apparatus

Details Magnetic recording and reproducing apparatus Magnetic recording and reproducing apparatus

2002-09-05

2003-05-20

Tupper, Robert S. (Department: 2652)

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Tape record

C360S085000

Reexamination Certificate

active

06567234

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic recording and reproducing apparatus and, more particularly, to a magnetic recording and reproducing apparatus arranged to perform magnetic recording and reproduction on or from a tape-shaped recording medium by pulling our the tape-shaped recording medium from a cassette and wrapping the tape-shaped recording medium around a drum.
2. Description of Related Art
FIG. 18
is a plan view showing, by way of example, the arrangement of a conventional magnetic recording and reproducing apparatus. A magnetic tape
101
serving as a recording medium is supplied from a supply reel
102
through a tension pole
103
, tape guides
104
,
105
and
106
to be wrapped around a rotary cylinder (drum)
107
which has recording and reproducing heads mounted thereon. After that, the magnetic tape
101
is taken up by a take-up reel
113
through tape guides
108
and
109
, a tape driving capstan
110
, a pinch roller
111
and another tape guide
112
.
Referring next to FIG.
19
and FIGS.
20
(
a
) and
20
(
b
), a reel mount driving mechanism provided in the magnetic recording and reproducing apparatus is described below.
FIG. 19
is a side view of a supply reel mount driving mechanism which is shown in FIG.
18
. The supply reel
102
(the take-up reel
113
) is fitted on a reel shaft
115
(
116
), which is mounted on a slide chassis
114
, to be rotatable around the reel shaft
115
(
116
). FIGS.
20
(
a
) and
20
(
b
) show, in an enlarged side view and a top view, respectively, the arrangement of the supply reel mount driving mechanism. The take-up reel mount driving mechanism is also arranged in exactly the same manner as the supply reel mount driving mechanism shown in FIGS.
20
(
a
) and
20
(
b
).
Referring to
FIG. 18
, the driving force of a capstan motor
150
which is disposed on a main chassis
117
is transmitted by means of gears
118
to
121
, a belt (not shown), etc., to a gear
123
which is rotatably fitted on a shaft
122
mounted on the main chassis
117
. The driving force transmitted to the gear
123
is transmitted further to a gear
126
which is rotatable around a shaft
125
mounted on a lever
124
, which is arranged to be swingable around the shaft
122
. The gear
126
and the lever
124
are arranged to engage each other through a torque transmitting means (not shown). The lever
124
is arranged to be caused by the rotation of the gear
123
to swing around the shaft
122
. When the gear
123
rotates counterclockwise, the gear
126
meshes with a gear
127
.
Referring to FIGS.
20
(
a
) and
20
(
b
), the details of the supply reel mount driving mechanism of the conventional arrangement are described below. The gear
127
is provided with a hysteresis plate
128
which is insert-molded. A gear
129
is provided with a yoke plate
130
which is insert-molded. A magnet
131
is magnetically attracted by the yoke plate
130
. A reel claw
133
and a reel claw spring
134
are mounted on the gear
129
. A reel cap
132
is press-fitted in the gear
129
. The reel claw
133
is under an upward urging force of the reel claw spring
134
. However, the position of the reel claw
133
is restricted by the reel cap
132
.
The gears
127
and
129
are caused by the magnet
131
which is magnetically attracted by the gear
129
to be magnetically attracted and pulled to each other at a contact part
136
of the gear
127
and a contact part
137
of the gear
129
across a washer
135
.
The supply reel
102
is rotatably fitted on the reel shaft
115
which is mounted on the slide chassis
114
.
Here, when the gear
126
moves in the direction of an arrow “a” shown in FIG.
20
(
a
) to mesh with the gear
127
, a hysteresis loss brought about by the magnet
131
and the hysteresis plate
128
and a friction loss brought about by the contact part
136
of the gear
127
, the contact part
137
of the gear
129
and the washer
135
cause a driving force to be transmitted from the gear
127
to the gear
129
with a certain fixed amount of torque.
Referring to
FIG. 18
, when the gear
123
rotates counterclockwise, the lever
124
swings counterclockwise around the shaft
122
. Then, following the counterclockwise movement of the lever
124
, the gear
126
moves, while rotating, up to such a position as to mesh with the gear
127
. As a result, the gear
127
(and the supply real
102
) rotates counterclockwise, i.e., in the direction of rewinding the tape
101
in this instance. Then, the tape
101
, which is wound around a reel hub
138
shown in FIG.
20
(
a
), is taken up and wound around the supply reel
102
by means of the reel claw
133
.
In this instance, the magnetic tape
101
is taken up and wound with a certain fixed amount of torque produced by the above-stated torque transmission means (the hysteresis loss caused by the hysteresis plate
128
and the magnet
131
and the friction loss caused by the contacts parts
136
and
137
and the washer
135
as mentioned above).
Referring further to
FIG. 18
, a T(take-up)-reel-side soft brake
140
and a T-reel-side lock brake
141
are fitted on a shaft
139
mounted on the slide chassis
114
, and a S(supply)-reel-side lock brake
143
is fitted on a shaft
142
mounted on the slide chassis
114
. A loading motor
144
is arranged to operate, through a leading gear train (not shown), a mode lever (not shown), etc., to turn on and off the T-reel-side soft brake
140
, the T-reel-side lock brake
141
, the S-reel-side lock brake
143
, etc., according to the operation mode of the magnetic recording and reproducing apparatus. The T-reel-side soft brake
140
, the T-reel-side lock brake
141
and the S-reel-side lock brake
143
are arranged to apply soft and lock brakes by coming into contact or meshing with the gear
127
and the gear
129
shown in FIG.
20
(
a
).
In the case of the conventional arrangement shown in
FIG. 18
, the reel mounts are disposed on the slide chassis
114
. A torque limiter (clutch) mechanism is arranged inside each of the reel mounts. In addition to that, brake contact parts are also arranged at the reel mounts. Therefore, each of the reel mounts thus has a complex structural arrangement, which necessitates having a large thickness between the lower part of the cassette and the slide chassis
114
, and which thus causes an increase in cost.
Further, in general, in the conventional magnetic recording and reproducing apparatuses, for example, a recorder deck of a camera-integrated-type video tape recorder (VTR) is arranged to have its mechanism installed on the upper surface of a chassis thereof because of the restrictions imposed by the shape and size of a cassette, the size of the apparatus itself, etc., and a stationary-type video tape recorder (VTR) is arranged, conversely, to have its mechanism installed on the back side of a chassis thereof.
However, the conventional magnetic recording and reproducing apparatuses, such as a recorder deck of a camera-integrated-type VTR, have presented such a problem that it is necessary to arrange a large clearance between a tape transport member and a tape loading driving member for the purpose of preventing lubricative grease or the like in a driving part of the tape transport member from sticking to a tape transport part of the tape transport member to soil the tape, or for the purpose of preventing the tape transport member and the tape loading driving member from interfering with each other. The necessity of having such a large clearance hinders a reduction in size of the apparatus.
On the other hand, in the case of a stationary-type VTR, a tape loading driving part is arranged on the back surface of a chassis, while guide posts provided for guiding the travel of a tape are arranged on the upper surface of the chassis. Although such an arrangement effectively prevents the guide posts from being soiled by grease or the like, since the surface of the chassis is arranged to have guide grooves for a pulling-out action of the guide posts on the tap

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