Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – With particular drive
Reexamination Certificate
2001-04-24
2003-04-22
Nguyen, John Q. (Department: 3653)
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
With particular drive
C242S356500, C360S096300, C360S096400
Reexamination Certificate
active
06550711
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field to which the Invention Belongs
The present invention relates to a magnetic tape apparatus intended to attain a high speed operation in a fast feed mode and a rewind mode.
2. Related Art
As the prior art of the magnetic tape apparatus, there have been such examples as one disclosed in the Unexamined Japanese Patent Application Publication No. Hei 5-298783. One of the examples will be described referring to FIG.
9
. Reference numeral
1
denotes a tape cassette,
2
denotes a pay-off reel table engaged with a pay-off reel of the tape cassette
1
,
3
denotes a roll-up reel table engaged with a roll-up reel of the tape cassette
1
,
4
denotes movable guide posts for winding a magnetic tape T drawn out from the tape cassette
1
around a head cylinder
5
,
6
denotes an all width erase head,
7
denotes a voice erase head,
8
denotes a voice control head,
9
denotes stationary tape guide posts,
10
denotes a capstan motor for rotating a capstan
10
a
in a normal and a reverse directions,
11
denotes a pinch roller adapted to come into pressure contact with and move away from the capstan
10
a
,
12
denotes a tension lever for pressing a tension post
12
a
against the magnetic tape T,
13
denotes a mode switch lever which is placed on a chassis
14
so as to move to and fro in directions of arrow marks a and b.
A pivotal shaft
15
is provided on the chassis
14
between the pay-off reel table
2
and the roll-up reel table
3
. A belt
18
is wound around a rotatable pulley
16
which is concentrically provided below the pivotal shaft
15
and a pulley
17
which is fixed to the aforesaid capstan
10
a
. An intermediate gear
19
is rotatably mounted around the pivotal shaft
15
, and a clutch mechanism
20
for directly or indirectly connecting the intermediate gear
19
to the pulley
16
is provided. There is provided a rocking arm
21
adapted to rock to and fro in directions of arrow marks c and d around the pivotal shaft
15
. An idler gear
22
pivotally fixed to an end of the rocking arm
21
is meshed with the intermediate gear
19
. On both sides of the idler gear
22
, there are arranged a roll-up gear
24
which is associated with teeth
3
a
of the roll-up reel table
3
by way of a gear
23
, and teeth
2
a
formed around the pay-off reel table
2
in a mutually opposed manner.
The aforesaid clutch mechanism
20
includes a clutch shaft
20
a
rotatably supported on the chassis
14
, a cam pin
20
b
which is provided projectingly at a middle part of the clutch shaft
20
a
and adapted to be engaged in a cam groove
13
a
of the mode switch lever
13
, and an arm
20
c
provided projectingly on the clutch shaft
20
a
and adapted to be engaged with the intermediate gear
19
.
In the above described structure, in a play back mode, the magnetic tape T is drawn out from the tape cassette
1
by means of the movable tape guide posts
4
and wound around the head cylinder
5
. At the same time, the tension lever
12
is erected to push the tension post
12
a
against the magnetic tape T so that the magnetic tape T is placed under tension so as to be in a loading state. By driving the capstan motor
10
in the normal direction, the rocking arm
21
is rocked in the direction of the arrow mark d by way of the pulleys
16
,
17
and the belt
18
. In this manner, the idler gear
22
is allowed to mesh with the roll-up gear
24
, and a rotary drive force of the pulley
16
is transmitted to the roll-up reel table
3
by way of a slip mechanism (not shown), the idler gear
22
, and the gears
23
,
24
, and thus, the roll-up reel table
3
is rotated in a direction of an arrow mark e to roll up the magnetic tape T.
In order to switch the mode from the play back mode to a play back rewind mode, the capstan motor
10
is rotated in the reverse direction. This allows the rocking arm
21
to be rocked in the direction of the arrow mark c by way of the pulleys
16
,
17
and the belt
18
, and the idler gear
22
is meshed with the teeth
2
a
of the pay-off reel table
2
. At the same time, the rotary drive force of the pulley
16
is transmitted to the pay-off reel table
2
by way of the slip mechanism, the intermediate gear
19
and the idler gear
22
, and thus, the pay-off reel table
2
is rotated in a direction of an arrow mark f to roll up the magnetic tape T.
In a fast feed mode and a rewind mode, the mode switch lever
13
is shifted in the direction of the arrow mark b allowing an angled portion
25
of the cam groove
13
a
to be engaged with the cam pin
20
b
. This allows the intermediate gear
19
to be directly connected to the pulley
16
by means of the arm
20
c
of the clutch mechanism
20
. In this manner, the rotary drive force of the pulley
16
is directly transmitted to the intermediate gear
19
so that the pay-off reel table
2
or the roll-up reel table
3
rolls up the magnetic tape T.
Problems to be Solved
In the above described structure, in the fast feed mode and the rewind mode, the intermediate gear
19
is directly connected to the pulley
16
so as to directly rotate the pay-off reel table
2
or the roll-up reel table
3
by means of the capstan motor
10
. However, since a speed increasing function is not provided, there has been a drawback that speed up of the rotation is limited, and a considerable time is required for the fast feed and the rewind of the magnetic tape T.
In view of such a conventional drawback as described above, it is an object of the invention to provide a magnetic tape apparatus in which fast feed and rewind of a magnetic tape can be conducted at high speed.
Means for Solving the Problems
In order to attain the above described object, the invention as in aspect
1
is a magnetic tape apparatus comprising an intermediate gear meshed with an idler gear which can be releasably meshed with a pay-off reel table and a roll-up reel table, a drive gear rotatably driven by drive means, and a driven gear which can be releasably meshed with the drive gear by way of a slip mechanism, and constructed in such a manner that the intermediate gear is directly connected to the drive gear in a fast feed mode and a rewind mode and indirectly connected to the drive gear by way of the slip mechanism and the driven gear in a play back mode and a play back rewind mode, characterized in that the intermediate gear is connected to the drive gear by way of a speed increasing mechanism in the fast feed mode and the rewind mode.
According to the above described structure, the fast feed and the rewind of the magnetic tape can be finished in a short time, because the rotation speed of the pay-off reel table or the roll-up reel table can be increased by the speed increasing mechanism in the fast feed mode and the rewind mode.
The invention according to aspect
2
is, in the invention as in aspect
1
, characterized in that the speed increasing mechanism includes a movable rotary body which is rotatably mounted around a support shaft and adapted to reciprocate along an axis of the support shaft, the movable rotary body being provided with a small diametered gear and a large diametered gear, and in the fast feed mode and the rewind mode, the large diametered gear is meshed with the intermediate gear while the small diametered gear is meshed with the drive gear.
According to the above described structure, in the fast feed mode and the rewind mode, the rotation speed of the pay-off reel table or the roll-up reel table can be increased due to a gear ratio between the large diametered gear and the small diametered gear. Moreover, because the structure of the speed increasing mechanism is simple, the magnetic tape apparatus is difficult to be broken and can be manufactured at a low cost.
The invention according to aspect
3
is, in the invention as in aspect
2
, characterized in that the movable rotary body is integrally provided with a large high speed gear which is larger in diameter than the large diametered gear, and in the fast feed mode and the rewind mode, the large high speed gear is meshed w
Hamabata Hiroshi
Sawai Kunio
Yokota Katsuyuki
Funai Electric Co. Ltd.
Nguyen John Q.
Rosenthal & Osha L.L.P.
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