JP3082609B2 - 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.

[0003] Even if the tape recorder is dedicated to reproduction, it is necessary to switch at least five modes of forward reproduction, reverse reproduction, fast-forward, rewind, and stop of the magnetic tape. As
(1) A method using one lever and two solenoids (for example, JP-A-56-134344), and (2) a method using one lever and one cam.

[0004]

However, (1)
In the method using one lever and two solenoids, an extra solenoid for selecting a mode is required, and there is a problem of high cost due to an increase in the number of parts. In the method (2) using one lever and one cam, the stroke of the lever becomes large in order to allocate the five modes described above, so that compactness cannot be achieved and the load acting on the lever is large. There are problems such as becoming.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. One cam is provided with two cam grooves, and each cam groove is provided with two levers, one for each. It is an object of the present invention to provide a tape recorder in which the number of components is reduced by a simple configuration that enables switching of all modes by combining the modes, and in which switching between normal rotation and reverse rotation and switching to stop mode is quick.

[0006]

In order to achieve the above object, a tape recorder according to the present invention controls the rotation of a motor via a belt on a magnetic tape winding reel so as to switch the running direction of the magnetic tape. the mode switching mechanism to change the meshing state of a gear mechanism for transmitting the rotation is transmitted
That receives a drive gear, a first and a mode switching cam having a second cam groove, the engagement and power to the first cam groove of this
A first control lever, the power engage the second cam groove receiving that
Takes the second control lever, mode switching from the driving gear
And a switching control means for controlling the rotation transmission to the rotation cam . The first control lever switches the normal rotation pinch roller and the reverse pinch roller, and the reel feed rotation system for fast-forward and reproduction, and the second control lever controls the rotation. It is configured to switch between a revolving and a reversing reel base rotating system, and includes, if necessary, means for controlling the rotation of a motor, and detecting means for detecting the rotational position of a mode switching cam rotated by the motor. The first and second control levers are arranged so that the mode switching cam stops at four positions in the order of normal rotation reproduction, fast forward, reverse reproduction, and rewind. In this case, the stop mode is set to a non-operating stop mode.

[0007]

According to the tape recorder of the present invention, as described above,
(1) The mode switching mechanism is provided with a drive gear to which rotation is transmitted.
When the mode change cam having a first and second cam grooves,
A first control lever which receives the engagement and power to the first cam groove of this, a second control lever which receives the engagement and power to the second cam groove, to mode switching cam from said drive gear
A first control lever for switching between a forward rotation pinch roller and a reversal pinch roller and a fast-forward and reproduction reel base rotation system, and a second control lever for switching between forward rotation and reverse rotation. Since the reel base rotation system is configured to be switched, the structure can be made compact with a small number of components, and the load acting on the control lever is reduced. Also, (2) the stop position of the mode switching cam is
A stop mode in which the first and second control levers are arranged in four places in the order of forward playback, fast forward, reverse playback, and rewind, and do not operate when the motor is stopped at the fast forward and rewind positions. Since the play mode is not set, the switching from the play mode to the stop mode can be quickly performed in one station, and the switching between the normal rotation and the reverse rotation can be quickly performed in two stations.

[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.

Reference numeral 5 denotes a gear mechanism for transmitting the rotation of the motor 3 to a reel 6a or 6b for winding the magnetic tape. The gear mechanism 5 includes a small gear 5aa and a large gear 5ab coaxially mounted thereon, and a large gear 5ba. And small gear 5bb
Are coaxially integrated, and a spring 5d (FIG. 7) is used during reproduction.
), The small gear 5bb meshes with the large gear 5ab, and at the time of fast-forwarding or rewinding, the first control lever 8b, which will be described later, acts against the urging force of a spring 5d to prevent the small gear 5bb from rotating. 7 side, large gear 5b
a meshes with a swing gear 5b meshing with the small gear 5aa, and a large gear 5ba forming the swing gear 5b during forward rotation, and a relay gear 5c which transmits rotation to a reel 6a for normal rotation.
It is composed of

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. 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 oscillating gear 5b and the substrate 7, and the oscillating 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 driving 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.

Although not shown, the tape recorder of the present invention detects the rotation position of the mode switching cam 8a rotated by the motor 3 by means for controlling the rotation of the motor 3 like a general tape recorder. Needless to say, a detection means is provided.

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 mode switching cam 8a, which is rotated by the rotation in the reverse direction of the motor 3 whose rotation speed is controlled by the control means (not shown), is detected by the detection means (not shown) and the mode is switched. FIG. 2 shows the cam 8a.
Stop at the position shown in. In this stop position, the protruding portion 8bc of the first control lever 8b penetrates between the boss 5bc of the swing gear 5b and the board 7 to push the swing gear 5b against the urging force of the spring 5d. And the small gear 5aa of the friction gear 5a meshes with the large gear 5ba of the swing gear 5b (see FIG. 7A), and a pinch for normal rotation is formed by a bent portion 8bf of the extending portion located on the magnetic head 9 side. One end of the spring 10c of the roller 10a is pressed to press the forward rotation pinch roller 10a against the first 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 swings to engage the large gear 5ba of the swing gear 5b with the relay gear 5c, rotates the forward reel 6a forward through the reel base gear 6aa, and performs forward playback. . [At the time of fast forward (see FIG. 4)]
Is rotated in the reverse direction, and is stopped when the mode switching cam 8a reaches the position shown in FIG. In this stop position, neither the protruding portions 8bc and 8bd of the first control lever 8b penetrate between the boss 5bc of the swing gear 5b and the board 7, and the swing gear 5b is actuated by the urging force of the spring 5d. Gear 7 of the friction gear 5a
ab meshes with the small gear 5bb of the swing gear 5b [FIG.
(See (b)). At this time, the bent portions 8be and 8bf at both ends of the extending portion located on the side of the magnetic head 9 do not press one ends of the springs 10c and 10d of the forward rotation pinch roller 10a and the reverse rotation pinch roller 10b.
a, 10b are not pressed against the first and second capstans 1a, 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 8
c swings so that the large gear 5ba of the swing gear 5b meshes 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)]
Is rotated in the reverse direction, and stopped when the mode switching cam 8a reaches the position shown in FIG. In this stop position, the protruding portion 8bd of the first control lever 8b penetrates between the boss 5bc of the swing gear 5b and the substrate 7, and the swing gear 5b
Is lifted toward the opposite side of the substrate 7 against the urging force of the spring 5d, and the small gear 5aa of the friction gear 5a and the swing gear 5
b (see FIG. 7 (a)), and the bent portion 8 of the extension portion located on the magnetic head 9 side.
Be pushes one end of the spring 10d of the reversing pinch roller 10b to press the reversing pinch roller 10b against the second 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 swings to engage the large gear 5ba of the swing gear 5b with the reel base gear 6ba of the inversion reel 6b, inverts the inversion reel 6b, and performs inversion reproduction. [At the time of rewinding (refer to FIG. 5)] The motor 3 is further rotated in the reverse direction from the time of the reverse reproduction, and the mode switching cam 8a
Stop when it reaches the position shown in. In this stop position, the projections 8bc, 8bd of the first control lever 8b
Does not penetrate between the boss 5bc of the oscillating gear 5b and the substrate 7, 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 the friction gear 5a and the oscillating gear 5b. The small gear 5bb of 5b is engaged (see FIG. 7B). At this time, the bent portions 8be and 8bf at both ends of the extending portion located on the magnetic head 9 side do not press one ends of the springs 10c and 10d of the forward rotation pinch roller 10a and the reverse rotation pinch roller 10b.
0a 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. [At Stop] When the motor 3 is stopped at the fast-forward and rewind positions described above, a stop mode is set in which the motor 3 does not operate.
By setting the stop mode in this way, it is possible to immediately stop at one station from either normal playback or reverse playback.

In this embodiment, one cam and two control levers are driven by one motor and a gear mechanism. However, one cam and two control levers are driven by a cam. It is needless to say that a two-motor driven by another motor or a cam switched by using a solenoid is within the technical scope of the present invention.

[0026]

As described above, according to the tape recorder of the present invention, the mode switching mechanism is driven by the rotation transmitting drive.
Gear and the first and the mode switching cam having a second cam groove, the first for receiving the engagement and power to the first cam groove of this
Control lever and a second control lever which receives the engagement and power to the second cam groove, the mode switching cam from the drive gear
Switching control means for controlling rotation transmission to the
The control lever switches between the forward rotation pinch roller, the reverse rotation pinch roller, and the reel base rotation system for fast-forward and reproduction.
The control lever can be used to switch between the normal rotation and the reverse rotation of the reel base rotation system, so that it can be made compact with a small number of parts such as one cam and two levers, and the load acting on the control lever is small. Become.

The first and second control levers are configured so that the mode switching cam stops at four positions in the order of forward reproduction, fast forward, reverse reproduction, and rewind, and fast forward and rewind. When the motor is stopped at the position and the stop mode is set to a non-operating stop mode, a simple mechanism is used, and switching from the play mode to the stop mode is performed in one station, and switching between normal rotation and reverse rotation is performed in two stations quickly. I can do it.

[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;

6A is a plan view showing the relationship between a first control lever and a head arm in one embodiment of the tape recorder of the present invention. FIG. 6B is a side view of FIG. In the figure, the head arm is in the tape cassette inserted state.

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

FIGS. 8A and 8B are explanatory views of a one-way clutch, wherein FIG.

[Explanation of symbols]

 Reference Signs List 3 motor 4 belt 5 gear mechanism 6a forward rotation reel 6b reverse reel 8 mode switching mechanism 8a mode switching cam 8aa first cam groove 8ab second cam groove 8b first control lever 8c second control lever 10a for forward rotation Pinch roller 10b Pinch roller for reversing

Claims (2)

(57) [Claims] 1. A to switch the traveling direction of the magnetic tape, a mode switching mechanism to change the meshing state of a gear mechanism for transmitting the rotation of the motor through a belt take-up reel of the magnetic tape, the rotation is transmitted a drive gear, a first and a mode switching cam having a second cam groove, and a first control lever which receives the engagement and power to the first cam groove of this, to engage the second cam groove A second control lever receiving power and the drive gear
Control to control the rotation transmission from the motor to the mode switching cam
A first control lever to switch a normal rotation pinch roller, a reverse pinch roller, and a reel feed rotation system for fast-forward and reproduction,
Tape recorder, characterized by being configured to switch the second forward and reversing reel base rotation system of the control lever. Means for controlling the rotation of the motor; and detecting means for detecting the rotational position of the mode switching cam rotated by the motor. , 4 in the order of rewind
The first and second control levers are configured so as to be in one position, and when the motor is stopped at the fast-forward and rewind positions,
The stop mode is set so that the magnetic tape does not operate.
Tape recorder according to claim 1, wherein the a.