JP2988278B2 - Tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder, and more particularly to a rotation transmitting mechanism of a tape recorder.

[0002]

2. Description of the Related Art In recent years, tape recorders, which operate not by levers but by motors and solenoids by a microcomputer to switch the running state of a magnetic tape, have become common.

A tape recorder must be switched between at least five modes, ie, forward playback, reverse playback, fast forward, rewind, and stop of the magnetic tape, even if it is dedicated to playback. As a method, there are a method using a dedicated motor and a cam gear, and a method using a cam gear having a solenoid and missing teeth. In any case, these systems require the use of expensive motors and solenoids. Therefore, JP
In JP-A-6-134344, a mechanism for switching all operation modes by combining a one-way clutch with one motor originally required was proposed.

[0004]

However, the mechanism proposed in Japanese Patent Application Laid-Open No. 56-134344 has two one-way clutches directly mounted on the motor shaft of the motor. Sound and current consumption increase. (2) The size of a product whose size is determined by the thickness of the motor is large. Further, there is a problem that (3) the rotation speed is high and the uneven rotation performance is deteriorated.

The present invention has been made in view of the above-mentioned conventional problems, and has a simple configuration in which all operation modes can be set only by controlling the rotation direction of one motor. It is an object of the present invention to provide an inexpensive, thin, high-performance tape recorder.

[0006]

In order to achieve the above object, a tape recorder according to the present invention comprises a first capstan and a first flywheel for forward rotation reproduction of a magnetic tape, and a reverse reproduction traveling of a magnetic tape. A second capstan and a second flywheel having different rotation directions from the first capstan and the first flywheel;
A motor capable of rotating the capstan and flywheel in either forward or reverse directions, a belt for transmitting the rotation of the motor to the first and second capstans and flywheel, and a reel for winding the magnetic tape. A gear mechanism for transmitting rotation, a mode switching mechanism for changing a meshing state of the gear mechanism to switch a running direction of the magnetic tape, a gear coaxial with the first or second flywheel and a gear mechanism meshing with the gear mechanism. The first that transmits rotation in only one direction
A one-way clutch, and a second one-way clutch that meshes with the gear coaxial with the second or first flywheel and the mode switching mechanism and transmits rotation in only one direction. In the first rotation direction in which the capstan rotates in the direction in which the magnetic tape is fed, the rotation is transmitted from the first one-way clutch to the gear mechanism to rotate the reel, while the second one-way clutch idles. When the rotation is not transmitted to the mode switching mechanism and the rotation is transmitted from the second one-way clutch to the mode switching mechanism when the rotation is in the second rotation direction opposite to the first rotation direction, the mode is switched.
The first one-way clutch is configured not to transmit the rotation to the gear mechanism and the reel by idling, and if necessary, the first flywheel and the second flywheel having different rotation directions are provided.
A first one-way clutch or a second one-way clutch having the same shape is connected to one of the gears coaxially mounted with the flywheel, and the first flywheel is connected via a belt from a motor. In addition, while the rotation is transmitted to the second flywheel, the rotation is transmitted to the gear mechanism via the first one-way clutch from the flywheel disposed closer to the motor.

[0007]

According to the tape recorder of the present invention, as described above,
(1) Since the two one-way clutches are provided immediately after the flywheel, not immediately after the motor, the rotation speed is low, the operation noise and the current consumption are small, and the uneven rotation performance is good. Also,
(2) A first one-way clutch and a second one-way clutch are respectively connected to the gears coaxial with the first flywheel and the coaxial gears with the second flywheel, each having a different rotation direction. Therefore, the two one-way clutches can have the same shape. (3) Normally, when the gear mechanism is connected to the flywheel, the load fluctuation is transmitted to the capstan, and the unevenness of rotation of the connected gear mechanism deteriorates. However, in the present invention, while rotation is transmitted from the motor to the first flywheel and the second flywheel via the belt, the inertia energy of the motor is changed from the flywheel closer to the motor to the first flywheel having good rotational unevenness performance. Since the tape recorder is connected to the directional clutch and the gear mechanism, a tape recorder having excellent rotation unevenness performance can be obtained.

[0008]

1 to 8 show a tape recorder according to the present invention.
A description will be given based on one embodiment shown in FIG.

FIG. 1 is a plan view of a rotation system in one embodiment of the tape recorder of the present invention, FIG. 2 is a plan view of a rotation system in normal reproduction in FIG. 1, and FIG. 3 is a rotation in reverse reproduction in FIG. 4 is a plan view of the rotating system at the time of fast-forward in FIG. 1, FIG. 5 is a plan view of the rotating system at the time of rewinding in FIG. 1, and FIG. 6 (a) is one embodiment of the tape recorder of the present invention. FIG. 2B is a plan view showing the relationship between the first control lever and the head arm and the like in the example, and FIG.
7 (c) is a view in which the head arm is in a tape cassette inserted state in FIG. 7 (b), FIG. 7 (a) is a view of the rotation system at the time of normal rotation reproduction viewed from the side, and FIG. FIG. 8 is an explanatory view of the one-way clutch when the rotating system is viewed from the side, and FIG. 8A is a diagram illustrating an integrated rotation, and FIG.

In the drawings, reference numeral 1a denotes a first capstan for rotating and reproducing the magnetic tape in the normal direction, and 1b denotes a second capstan for reverse reproduction and running in a different rotation direction from the first capstan 1a. A first flywheel 2 is provided on each of the first and second capstans 1a and 1b.
a and the second flywheel 2b are coaxially mounted so as to rotate integrally.

Reference numeral 3 denotes a motor which can rotate in both forward and reverse rotations. The rotation of the motor 3 is transmitted via a belt 4 to the first capstan 1a and the first flywheel 2
a and the second capstan 1b and the second flywheel 2b on the side close to the motor 3 to rotate the first flywheel 2a and the second flywheel 2b in opposite directions.

Numeral 5 is a gear mechanism for transmitting the rotation of the motor 3 to the reel 6a or 6b for winding the magnetic tape, and includes a friction gear 5a, a swing gear 5b, and a relay gear 5a.
c. Of these, friction gear 5
“a” transmits a constant torque, and has a configuration in which a small gear 5aa and a large gear 5ab are coaxially mounted. The swing gear 5b is formed by integrally forming a large gear 5ba and a small gear 5bb coaxially.
d (see FIG. 7), the pinion 5
bb meshes with the large gear 5ab, and at the time of reproduction, moves to the side opposite to the substrate 7 against the urging force of the spring 5d by the action of a first control lever 8b described later, and the large gear 5ba meshes with the small gear 5aa. Is what you do. The relay gear 5c meshes with the large gear 5ba of the oscillating gear 5b which has been oscillated by the action of a second control lever 8c described later only during normal rotation, and transmits rotation to the reel 6a for normal rotation.

Reference numeral 8 denotes a mode switching mechanism for changing the meshing state of the gear mechanism 5 so as to switch the running direction of the magnetic tape. The mode switching mechanism 8 includes a mode switching cam 8a having first and second cam grooves 8aa and 8ab. First cam groove 8a
a first control lever 8b engaging with the second cam groove 8
and a second control lever 8c that engages with ab.

The center of the first control lever 8b is rotated by a pin 8ba guided by the first cam groove 8aa by the rotation of the mode switching cam 8a.
And at the time of reproduction, the protruding portions 8bc and 8b provided on the bifurcated extending portions located on the reels 6a and 6b side, respectively.
d penetrates between the boss 5bc of the oscillating gear 5b and the substrate 7 to lift the oscillating gear 5b toward the opposite substrate 7 against the urging force of the spring 5d, and the small gear 5aa of the friction gear 5a The large gear 5ba of the swing gear 5b is engaged (see FIG. 7A). At the same time, one of the bent portions 8be and 8bf at both ends of the extending portion located on the magnetic head 9 side pushes one end of the springs 10c and 10d of the forward rotation pinch roller 10a or the reverse rotation pinch roller 10b to push either one of them. The pinch roller 10a or 10b is pressed against the first or second capstan 1a or 1b, and a pin 8bg provided at the center of the extension located on the magnetic head 9 side.
Then, the head arm 11 to which the magnetic head 9 is attached is pushed out to the magnetic tape side against the urging force of a spring (not shown) (see FIG. 6A).

Further, at the time of fast-forward or rewind, neither of the protruding portions 8bc and 8bd penetrates between the boss 5bc of the swing gear 5b and the substrate 7, and the swing gear 5b is actuated by the urging force of the spring 5d. 7, a large gear 5ab of the friction gear 5a and a small gear 5 of the swing gear 5b.
bb is engaged (see FIG. 7B). At this time, the bent portions 8b at both ends of the extending portion located on the magnetic head 9 side
Neither e nor 8bf pushes one ends of the springs 10c and 10d of the forward rotation pinch roller 10a and the reverse rotation pinch roller 10b, and the two pinch rollers 10a and 10b are not pressed against the first and second capstans 1a and 1b. . In addition, a pin 8b provided at the center of the extension portion located on the magnetic head 9 side
g also does not push the head arm 11 toward the magnetic tape against the urging force of a spring (not shown).

That is, the first control lever 8b is rotated by the mode switching cam 8a to rotate the pinch roller 10 for forward rotation.
a, a reversing pinch roller 10b, and a reel base rotation system for fast-forward and reproduction.

The second control lever 8c swings about its center as a rotation center 8cb by the action of a pin 8ca guided by the second cam groove 8ab by the rotation of the mode switching cam 8a. Extension portion 8c located on 6b side
When the large gear 5ba is rotated forward by rotating the swing gear 5b rotatably attached to the relay gear 5c, the relay gear 5c is rotated.
Through a reel base gear 6aa mounted coaxially with the normal rotation reel 6a, and at the time of reversal, with a reel base gear 6ba mounted coaxially with the reversal reel 6b. That is, the second control lever 8c switches between the normal rotation and the reverse rotation of the reel base by the rotation of the mode switching cam 8a.

At this time, the rotation position of the mode switching cam 8a is detected by the detecting means, and the first and second control levers 8b and 8c determine whether the stop position of the mode switching cam 8a is forward reproduction, fast forward, The stop mode is such that there are four places in the order of reverse playback and rewind, and the motor 3 does not operate when the motor 3 is stopped at the fast-forward and rewind positions.

Reference numeral 12a denotes a direction in which one of the rotations of the second flywheel 2b, that is, a first rotation direction in which the first and second capstans 1a and 1b rotate in a direction for feeding the magnetic tape. Only a first one-way clutch that locks the drive side and the driven side by a connecting member 12c and transmits rotation to the gear mechanism 5 as shown in FIG. Coaxial gear 2ba
The large gear 12aa provided on the driving side meshes with the
The large gear 5ab of the friction gear 5a meshes with the pinion 12ab provided on the driven side.

12b is similar to the first one-way clutch 12a only in one direction of the rotation of the first flywheel 2a, ie, in the second rotation direction opposite to the first rotation direction. , A second one-way clutch that transmits rotation to the mode switching mechanism 8, and has the same shape as the first one-way clutch 12a. And this second one
The direction clutch 12b has a gear 2aa coaxial with the first flywheel 2a meshed with a large gear 12ba provided on the drive side thereof, while a pinion 12bb provided on the driven side is provided on the outer periphery of the mode switching cam 8a. The large gear 8ac is engaged.

In the first rotation direction, FIG.
As shown in (b), the driving side and the driven side are connected to the connecting member 12c.
As a result, the second one-way clutch 12b idles and does not transmit rotation to the mode switching mechanism 8, and the first one-way clutch 12a is in the second rotation direction. Similarly, it does not rotate and does not transmit rotation to the gear mechanism 5.

The tape recorder of the present invention is configured as described above, and its operation will be described below.

[At the time of normal rotation reproduction (see FIG. 2)] The rotation position of the mode switching cam 8a rotated by the rotation of the motor 3 in the reverse direction is detected by a detecting means (not shown), and the mode switching cam 8a is shown in FIG. Stop at a suitable position.
In this stop position, the projection 8b of the first control lever 8b
c penetrates between the boss portion 5bc of the oscillating gear 5b and the substrate 7 to lift the oscillating gear 5b toward the opposite substrate 7 against the urging force of the spring 5d, and the small gear 5aa of the friction gear 5a.
And the large gear 5ba of the oscillating gear 5b (see FIG. 7A), and one end of the spring 10c of the forward rotation pinch roller 10a is pushed forward by the bent portion 8bf of the extension portion located on the magnetic head 9 side. The diversion pinch roller 10a is
To the capstan 1a. At this time, the head arm 11 to which the magnetic head 9 is attached is pushed out to the magnetic tape side against the urging force of a spring (not shown) by a pin 8bg provided at the center of the extending portion located on the magnetic head 9 side.
On the other hand, the second control lever 8c is the large gear 5 of the swing gear 5b.
The ba is swung so as to mesh with the relay gear 5c, the forward rotation reel 6a is rotated forward through the reel base gear 6aa, and forward rotation reproduction is performed.

[Fast-forward (see FIG. 4)] The motor 3 is further rotated in the reverse direction after the forward rotation reproduction, and stopped when the mode switching cam 8a reaches the position shown in FIG.
In this stop position, the projection 8b of the first control lever 8b
Neither c nor 8bd penetrates between the boss portion 5bc of the oscillating gear 5b and the substrate 7, and the oscillating gear 5b is positioned on the substrate 7 side by the urging force of the spring 5d, and
The large gear 5ab of FIG. 7A meshes with the small gear 5bb of the swing gear 5b (see FIG. 7B). At this time, the magnetic head 9
The bent portions 8be and 8bf at both ends of the extension portion located on the side do not push one ends of the springs 10c and 10d of the forward rotation pinch roller 10a and the reverse rotation pinch roller 10b, and the two pinch rollers 10a and 10b Capstan 1 of 2
a, 1b. In addition, the pin 8bg provided at the center of the extension located on the magnetic head 9 side does not push the head arm 11 toward the magnetic tape. On the other hand, the second control lever 8c swings to engage the large gear 5ba of the swing gear 5b with the relay gear 5c, rotates the forward rotation reel 6a forward through the reel base gear 6aa, and fast-forwards.

[At the time of reverse reproduction (see FIG. 3)] The motor 3 is further rotated in the reverse direction from the time of fast forward, and stopped when the mode switching cam 8a reaches the position shown in FIG.
In this stop position, the projection 8b of the first control lever 8b
d penetrates between the boss 5bc of the oscillating gear 5b and the substrate 7 to lift the oscillating gear 5b toward the opposite substrate 7 against the urging force of the spring 5d, and the small gear 5aa of the friction gear 5a.
And the large gear 5ba of the oscillating gear 5b (see FIG. 7 (a)), and one end of the spring 10d of the reversing pinch roller 10b is pressed by the bent portion 8be of the extending portion located on the magnetic head 9 side to reverse. Pinch roller 10b for the second
To the capstan 1b. At this time, the head arm 11 to which the magnetic head 9 is attached is pushed out to the magnetic tape side against the urging force of a spring (not shown) by a pin 8bg provided at the center of the extending portion located on the magnetic head 9 side.
On the other hand, the second control lever 8c is the large gear 5 of the swing gear 5b.
The ba is swung so as to mesh with the reel base gear 6ba of the reversing reel 6b, the reversing reel 6b is reversed, and reversal reproduction is performed.

[Rewinding (see FIG. 5)] The motor 3 is further rotated in the reversing direction after the reversing reproduction, and stopped when the mode switching cam 8a reaches the position shown in FIG. In this stop position, both the protrusions 8bc and 8bd of the first control lever 8b are connected to the boss 5b of the swing gear 5b.
c and the substrate 7 does not penetrate, and the swing gear 5b is
The large gear 5ab of the friction gear 5a and the small gear 5bb of the oscillating gear 5b are meshed with each other by the urging force of d (see FIG. 7B). At this time, the bent portions 8be, 8b at both ends of the extension portion located on the magnetic head 9 side are provided.
Neither f pushes one ends of the springs 10c and 10d of the forward rotation pinch roller 10a and the reverse rotation pinch roller 10b, and the two pinch rollers 10a and 10b are not pressed against the first and second capstans 1a and 1b. In addition, the pin 8bg provided at the center of the extension located on the magnetic head 9 side does not push the head arm 11 toward the magnetic tape.

On the other hand, the second control lever 8c is
b gear wheel 5ba is turned to reel base gear 6 of reversing reel 6b.
It swings so as to mesh with ba, inverts the reversing reel 6b, and rewinds.

If the motor 3 is stopped at the fast-forward and rewind positions described above, a stop mode in which the motor 3 does not operate can be used to immediately stop the motor in the normal rotation reproduction or reverse reproduction state.

[0029]

As described above, in the tape recorder of the present invention, two one-way clutches are installed immediately after the flywheel, not immediately after the motor, so that the rotation speed is low and the operation noise and current consumption are small. , Good uneven rotation performance. Also, the rotation of the tape recorder of the present invention, which is transmitted from the motor to the first flywheel and the second flywheel via the belt, can be achieved by using a flywheel close to a motor having good motor inertia energy rotation unevenness performance. The first one
Since the tape recorder is connected to the directional clutch and the gear mechanism, a tape recorder having excellent rotation unevenness performance can be obtained. Further, the tape recorder of the present invention can be set in all operation modes only by controlling the rotation direction of one motor without requiring an expensive solenoid, so that it is not bulky and compact.
And it is inexpensive.

[Brief description of the drawings]

FIG. 1 is a plan view of a rotating system in an embodiment of a tape recorder of the present invention.

FIG. 2 is a plan view of a rotating system during normal rotation reproduction in FIG. 1;

FIG. 3 is a plan view of a rotating system during reverse reproduction in FIG. 1;

FIG. 4 is a plan view of the rotating system at the time of rapid traverse in FIG. 1;

FIG. 5 is a plan view of the rotating system at the time of rewinding in FIG. 1;

FIG. 6 is a diagram showing a relationship between a first control lever, a head arm and the like in one embodiment of the tape recorder of the present invention.

FIG. 7A is a side view of a rotating system during normal rotation reproduction. FIG. 7B is a side view of a rotating system during fast forward.

FIG. 8 is an explanatory view of a one-way clutch.

[Explanation of symbols]

 1a 1st capstan 1b 2nd capstan 2a 1st flywheel 2aa gear 2b 2nd flywheel 2ba gear 3 motor 4 belt 5 gear mechanism 6a forward rotation reel 6b reversing reel 8 mode switching mechanism 8a mode switching Cam 8b First control lever 8c Second control lever 12a First one-way clutch 12b Second one-way clutch

Claims (3)

(57) [Claims] 1. A first capstan and a first flywheel for forward rotation reproduction of a magnetic tape, and a first capstan and a first flywheel having a rotation direction different from that of the first capstan and first flywheel for reverse reproduction. A second capstan and a second flywheel, a motor capable of rotating the first and second capstans and the flywheel in both forward and reverse directions, and a rotation of the motor in the first and second directions. A belt for transmitting to a capstan and a flywheel, a gear mechanism for transmitting rotation to a magnetic tape take-up reel, a mode switching mechanism for changing a meshing state of the gear mechanism to switch a running direction of the magnetic tape, A first one-way clutch that meshes with a gear coaxial with the first or second flywheel and the gear mechanism and transmits rotation in only one direction;
A gear that is coaxial with the second or first flywheel and a second one-way clutch that meshes with the mode switching mechanism and transmits rotation in only one direction, wherein the first and second capstans use a magnetic tape. At the time of the first rotation direction rotating in the feeding direction, the rotation is transmitted from the first one-way clutch to the gear mechanism to rotate the reel, while the second one-way clutch idles and rotates to the mode switching mechanism. When the transmission is not performed and the rotation is in the second rotation direction opposite to the first rotation direction, the rotation is transmitted from the second one-way clutch to the mode switching mechanism to switch the mode, while the first one-way clutch is idle. A tape recorder characterized in that rotation is not transmitted to a gear mechanism or a reel. 2. A first one-way clutch or a second one-way clutch having the same shape is provided on one of gears coaxially mounted on a first flywheel and a second flywheel having different rotation directions. The tape recorder according to claim 1, wherein the tape recorder is connected. 3. While rotation is transmitted from the motor to the first flywheel and the second flywheel via the belt, the flywheel disposed closer to the motor is connected via the first one-way clutch. The tape recorder according to claim 1, wherein the rotation is transmitted to the gear mechanism by a rotation.