Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – With particular drive
Reexamination Certificate
1999-03-25
2001-01-09
Matecki, Katherine A. (Department: 3653)
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
With particular drive
C360S096400
Reexamination Certificate
active
06170774
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a reel support drive device for use in magnetic recording-reproduction apparatus, such as VCRs (video cassette recorders) and DATs (digital audio tape recorders), for drivingly rotating a supply reel support and a take-up reel support by a motor.
BACKGROUND OF THE INVENTION
With reference to
FIG. 8
, the rotation of a capstan motor
13
is conventionally transmitted to a reel gear
73
of a supply reel support or to a reel gear
74
of a take-up reel support by way of a clutch rotation mechanism
194
, frictional power transmission mechanism
190
, swing idler mechanism
5
and one of a plurality of intermediate gears
60
.
A drive pulley
14
is mounted on the output shaft of the capstan motor
13
and coupled to a driven pulley
195
of the clutch rotation mechanism
194
by a belt
15
. A first gear
196
fixed to the driven pulley
195
is in mesh with a first gear
191
of the frictional power transmission mechanism
190
. A felt plate (not shown) is interposed between the first gear
191
of the transmission mechanism
190
and a second gear
192
thereof. The second gear
192
of the transmission mechanism
190
is in mesh with a second gear
197
of the clutch rotation mechanism
194
. A third gear
198
fixed to the second gear
197
is in mesh with a small gear
55
of an idler
52
providing the swing idler mechanism
5
. A large gear
54
is fixed to the small gear
55
. The large gear
54
is caused to selectively mesh with one of the intermediate gears
60
by the swing motion of the idler
52
.
In this way, the rotation of the capstan motor
13
is transmitted to one of the reel gears
73
,
74
selectively, drivingly rotating the supply reel support or take-up reel support in a tape winding direction.
The VCR can be set in a forward reproduction mode (hereinafter referred to as the “PLAY mode”) wherein the take-up reel support (reel gear
74
) is drivingly rotated in the tape winding direction (clockwise direction) to play back a magnetic tape as loaded in position, i.e., as wound around a capstan and a rotary head cylinder. The VCR can be set also in a reverse reproduction mode (hereinafter referred to as the “REV mode”) wherein the supply reel support (reel gear
73
) is drivingly rotated in the tape winding direction (counterclockwise direction) to play back the tape as loaded. The recorder is further settable in a fast forward mode (hereinafter referred to as the “FF mode”) wherein the take-up reel support is rotated at a high speed in the tape winding direction, and in a rewind mode (hereinafter referred to as the “REW mode”) wherein the supply reel support is rotated at a high speed in the tape winding direction.
In the PLAY mode and the REV mode, the first gear
196
and the second gear
197
of the clutch rotation mechanism
194
are out of engagement and rotatable relative to each other, permitting the rotation of the capstan motor
13
to be transmitted to the swing idler mechanism
5
through the frictional transmission mechanism
190
. In the FF mode and the REW mode, on the other hand, the first gear
196
and the second gear
197
of the clutch rotation mechanism
194
are rotatable together in engagement to transmit the rotation of the capstan motor
13
from the mechanism
194
directly to the idler mechanism
5
.
In the VCR, the tape running path extending from the supply reel support to the capstan via the rotary head cylinder involves a great load. In the PLAY mode, the capstan gives an additional tape transport force for running the magnetic tape from the supply reel support to the capstan via the head cylinder, whereas the capstan gives no tape transport force in the REV mode for running the magnetic tape from the capstan to the supply reel support via the rotary head cylinder. Accordingly, driving the supply reel support in the REV mode requires greater torque than is needed in the PLAY mode.
With the conventional VCR, therefore, the reel gear
73
of the supply reel support and the reel gear
74
of the take-up reel support are made different in reduction ratio so as to give greater drive torque to the supply reel support in the REV mode than to the take-up reel support in the PLAY mode.
The difference in reduction ratio between the reel gear
73
of the supply reel support and the reel gear
74
of the take-up reel support nevertheless entails the problem that the tape winding speed becomes lower in the REW mode than in the FF mode to impair the sophistication of the recorder operation.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a reel support drive device wherein the reduction ratio of the power transmission path from the motor to the supply reel support is made equal to that of the power transmission path from the motor to the take-up reel support in both the FF mode and the REW mode, and greater drive torque can nevertheless be given to the supply reel support in the REV mode than to the take-up reel support in the PLAY mode.
The present invention provides a reel support drive mechanism which has a frictional power transmission mechanism
2
disposed in a power transmission path extending from a capstan motor
13
toward a supply reel support
7
and a take-up reel support
71
, the transmission mechanism
2
comprising a friction member (felt plate
23
) interposed between an input rotary body (pulley
21
) and an output rotary body (comprising a PLAY disk
32
and a REV disk
26
) which are coaxially rotatable relative to each other.
The output rotary body of the power transmission mechanism
2
comprises a first rotary member (PLAY disk
32
) slidable in contact with one of an outer peripheral region and an inner peripheral region of the friction member, a second rotary member (REV disk
26
) slidable in contact with the other region of the friction member, and one-way clutch means (one-way clutch spring
27
) provided between the two rotary members. The first rotary member (PLAY disk
32
) outputs power. The one-way clutch means (one-way clutch spring
27
) connects the first rotary member (PLAY disk
32
) and the second rotary member (REV disk
26
) to each other in the REV mode while disconnecting the two rotary members from each other in the PLAY mode.
When the PLAY mode is set, the PLAY disk
32
and the REV disk
26
are disconnected by the one-way clutch spring
27
and made rotatable relative to each other. When the pulley
21
is drivingly rotated in this state, the PLAY disk
32
, which is loaded, slips relative to the felt plate
23
.
On the other hand, the REV disk
26
is free to rotate relative to the PLAY disk
32
and therefore rotates with the pulley
21
and the felt plate
23
without slipping relative to the felt plate
23
. Accordingly, the PLAY disk
32
outputs frictional torque resulting from the slippage between the felt plate
23
and the PLAY disk
32
.
When the REV mode is set, the PLAY disk
32
and the REV disk
26
are connected by the one-way clutch spring
27
and therefore rotatable together. When the pulley
21
is drivingly rotated in this state, the PLAY disk
32
, which is loaded, slips relative to the felt plate
23
. Since the REV disk
26
rotates with the PLAY disk
32
, slippage also occurs between the felt plate
23
and the REV disk
26
.
The frictional torque resulting from the slippage between the felt plate
23
and the REV disk
26
is therefore added to the frictional torque due to the slippage between the felt plate
23
and the PLAY disk
32
, and the combined value of the two frictional torques is delivered from the PLAY disk
32
.
In a specific embodiment, a clutch rotary body (clutch gear
4
) is provided coaxially with the input rotary body (pulley
21
) and the output rotary body (PLAY disk
32
and REV disk
26
) of the power transmission mechanism (
2
). The clutch rotary body is in engagement with the first rotary member (PLAY disk
32
) of the output rotary body at all times to rotate therewith and is engageable with or disengageable from the input rotary body (pulley
21
) to rotate
Akashi Yoshiharu
Okuie Takahiro
Armstrong, Westerman Hattori, McLeland & Naughton
Matecki Katherine A.
Sanyo Electric Co,. Ltd.
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