JPH05307723A - Head moving device - Google Patents

Abstract

PURPOSE:To miniaturize the device by possessing a 2nd cam mechanism capable of operating independently of a 1st cam mechanism for the purpose of driving a head supporting member to bring the other head into contact with a tape. CONSTITUTION:Cam gears 25a and 25b are turned by a prescribed angle by turning 1st and 2nd trigger levers 15 and 16 and moving pins 19a and 19b of their turning end parts outwardly respectively. Consequently, untoothed parts of the cam gears 25a and 25b are moved and toothed parts are meshed with step gears 39a and 39b respectively. Then, by turning the 1st and 2nd cam gears 25a and 25b, the head supporting member 80 is operated to make 1st and 2nd recording and reproducing heads 82a and 82b selectively move out and in to approach to and separate from the magnetic tape 32a, so that the diameter of the cam mechanism can be diminished, and hence miniaturization of the device can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head moving device for moving a head of a tape recorder, for example.

[0002]

2. Description of the Related Art A tape recorder has a pair of reel shafts, a tape is wound between the pair of reel shafts, and the reel shafts are rotated forward and backward to rotate the tape. -Pop is designed to run in one direction or the other.

In the pre-mode, the head is moved into contact with the tape, and in the stop mode or the fast-forward mode, the head is moved in the reverse direction and separated from the tape. It is designed to let you.

Some tape recorders include a pair of heads, and the pair of heads can be selectively contacted with the tape for use.

The pair of heads are attached to a head supporting member, and the head supporting member is operated to selectively move the heads in and out to contact the tape.

[0006]

However, in the prior art, since the head supporting member is operated by the single cam mechanism, the diameter of the cam mechanism becomes large and the operation area is required to be wide. However, there was a problem that it became large.

In view of this, the present invention provides a head moving device capable of operating a head supporting member to selectively move a pair of heads to be brought into contact with and separated from a tape without increasing the diameter of a cam mechanism. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a pair of heads which are selectively used in correspondence with the tape traveling direction and which is attached and swingable. A member, a first cam mechanism that drives the head support member to bring one head into contact with the tape, and the first cam mechanism that is operable independently of the other head.
And a second cam mechanism for driving the head support member so as to abut on the head.

[0009]

The structure of the cam mechanism can be made compact by dividing the cam mechanism for operating the head support member into the first and second cam mechanisms and independently operating them.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing the main structure of a center-capstan type tape recorder according to an embodiment of the present invention, and FIG. 2 shows the state in the stop mode.
1 and 3 are plan views showing partially enlarged states in the pre-mode.

This tape recorder uses a known tape cassette called a so-called microcassette, and when the end of the magnetic tape is detected by a known end detecting means during operation, it is an auto-river system. Change the running direction of the magnetic tape with.

The base end of a pair of reel shafts 34a, 34b on which a pair of reel hubs of a microcassette is mounted is rotatably mounted in an unillustrated substantially rectangular outer housing of a tape recorder. A flat plate-shaped support member 36 supported in the horizontal direction is stored horizontally, and the support member 36 is made of, for example, a non-magnetic material such as fiber reinforced synthetic resin or stainless steel.

The shape of the support member 36 is omitted in the drawing, and the members arranged on the lower surface side of the support member 36 are illustrated without the support member 36 for convenience.

The support member 36 has a pair of reel shafts 34a, 34 approximately at the center of the pair of reel shafts 34a, 34b.
Capstan 5 at a position separated from the line connecting b
The base end of 2 is rotatably supported. A flywheel 54 is concentrically fixed to the base end of the capstan 52 on the lower surface side of the support member 36.

On the lower surface side of the supporting member 36, 1
A bidirectional motor 58 is arranged at a corner near one of the reel shafts 34a on the side opposite to the capstan 52 with respect to the line connecting the pair of reel shafts 34a and 34b. The bidirectional motor 58 is attached to the support member 3 by a mounting member (not shown).
It is fixed to the lower surface of 6.

An output pulley 58a is fixed to the output shaft of the bidirectional motor 58, and the flywheel 54 is connected to the output pulley 58a via a power transmission belt 60.

Further, an output gear 1 as a main gear is concentrically fixed to a base end portion of the capstan 52, and a rotation lever-2 as a rotation member is rotatably supported. There is. A first idler gear 3 is rotatably attached to one end side of the lower surface of the rotary lever-2, and a second idler gear 4 is rotatably attached to the other end side of the lower surface.

The first and second idler gears 3,
Reference numerals 4 are in mesh with the output gears 1, respectively.

Further, first and second reel gears 5, 6 are concentrically fixed to the base ends of the pair of reel shafts 34a, 34b on the lower surface side of the support member 36. The first and second reel gears 5 and 6 have the above-mentioned rotation lever-2.
The first and second idler gears 3 and 4 are moved by the rotation in the forward and reverse directions to selectively engage with each other.

Further, step gears 39a and 39b composed of a small-diameter gear portion 39c and a large-diameter gear portion 39d are rotatably arranged in the movement paths of the first and second idler gears 3 and 4. .. First and second cam gears 25a, 25b forming first and second cam mechanisms are rotatably disposed near the step gears 39a, 39b.
These cam gears 25a and 25b are the step gears 39a and 3b.
It is adapted to mesh with the small diameter gear portion 39c of 9b.
The cam gears 25a and 25b are provided with toothless portions (not shown) on both sides thereof.
Every time 5b is rotated by 180 °, it faces the small-diameter gear portion of the stepped gears 39a, 39b, and the rotation is stopped.

A cam 74 as shown in FIGS. 4 and 5 is formed on the front surfaces of the cam gears 25a and 25b, and a cam (not shown) is formed on the rear surface.

A groove 79 is formed on the cam 74, and an inner cam surface 74a and an outer cam surface 74 are formed along the groove 79.
b is provided.

The above-mentioned first and second cam gears 25a, 2
As shown in FIG. 7, a part of the stepped portion 2 on the outer peripheral portion of the stepped gear 39d in the play state of FIGS.
5c is formed, and the stepped portion 25 is formed by the stepped gears 39a,
The large-diameter gear portion 39d of 39b is spaced apart and opposed to the peripheral edge portion on the back surface side.

By forming the step portion 25c, the peripheral edges of the cam gears 25a and 25b on the front surface side and the step gear 39 are formed.
The clearance between the large-diameter gear portion 29d of the a and 39b and the peripheral edge portion on the rear surface side becomes large, and the first and second cam gears 25
The above step gears 39a, 39b during rotation of a, 25b
It is designed to prevent contact with the player and to prevent noise during play.

Further, drive levers 26a and 26b are opposed to the front surfaces of the cam gears 25a and 25b. These drive levers 26a and 26b are rotatably supported by support shafts 27a and 27b. These drive levers-2
Coil springs 28a and 28b are connected to 6a and 26b, and these coil springs 28a and 28b urge the drive lever 26a to rotate clockwise and the drive lever 26b to rotate counterclockwise. Pins 49a, 49 are provided on the lower surface of the drive levers 26a, 26b.
b is projected, and these pins 49a, 49b are in contact with the cam surface of the cam 74 on the surface side of the cam gears 25a, 25b.

Protrusions 26c and 26d are formed on the outer upper side of the drive levers 26a and 26b in the figure, and these protrusions 26c and 26d are the first to be described later in the fast forward mode and the rewind mode. Of the trigger lever 15 and the stopper portion 14a of the second trigger lever 16 are respectively brought into contact with the drive levers 26a and 26b.
The rotation of is regulated.

The pins 49a and 49b fall into the groove 79 in the pre-mode and relatively move along the inner cam surface 74a, and triggers to be described later in the fast-forward mode and the rewind mode. -By the operation of Lever-15,16,
It is configured to move relatively along the outer cam surface 74b without falling into the groove 79.

Further, the rotary end edges of the interlocking levers 29a and 29b are in contact with the lower ends of the drive levers 26a and 26b in the figure. These interlocking levers 29a, 29
b is rotatably supported by spindles 90a and 90b. Engagement holes 45a and 45b are bored on the rotating portion side of the interlocking levers 29a and 29b.
Guide pins 88a and 88b projecting from both ends of a magnetic head support plate, which will be described later, are engaged with a and 45b.

On the other hand, on the lower surface side of the stepped gears 39a and 39b, delaying rotation levers 41a and 41b are coaxially and rotatably provided. These delay rotation levers 41a,
Pins 47a and 47b are provided on one end of 41b so as to project upward, and stoppers 42a and 42b are formed on the other end. Coil springs 43a and 43b are connected to the delay levers 41a and 41b, respectively, and the delay lever 41a is rotated counterclockwise and the delay lever 41b is delayed.
Is biased to rotate clockwise. The pins 47a, 47b of the delaying levers 41a, 41b are in contact with the cams on the back side of the cam gears 25a, 25b. The stopper portions 42a and 42b of the delay turning levers 41a and 41b are the first and second idlers.
The rotation end of the rotation lever 2 provided with the gears 3 and 4 is brought into contact with the magnetic tape to temporarily regulate the rotation, and the magnetic tape is provided before the recording / reproducing head contacts the magnetic tape 32a. 32a is not allowed to run.

The cam shapes of the cam gears 25a and 25b are such that when the cam gears 25a and 25b are rotated, first, the pins 49a and 49b of the drive levers 26a and 26b are actuated, and then there is a slight time difference for delaying. Rotating lever 41
It is formed to operate the pins 47a and 47b of a and 41b.

The rotating ends of the first and second trigger levers 15 and 16 are opposed to the lower surfaces of the cam gears 25a and 25b. The second trigger lever 16 is composed of first and second turning levers 13 and 14, and the first and second turning levers 13 and 14 are the same spindle 1.
It is rotatably supported by 7b. A pin 19a, is provided at the rotary end of the second rotary lever 14 constituting the first trigger lever 15 and the second trigger lever 16.
19b are provided so as to project upward, and these pins 19a and 19b are in contact with the cams on the back side of the cam gears 25a and 25b.

A stopper portion 15a is provided on the outer side of the first trigger lever 15 in the drawing, and a second stopper portion 15a is provided.
Second rotary lever 14 constituting the trigger lever 16 of
In the figure, a stopper portion 14a is provided so as to project on the outer side portion. When the self-holding solenoid 11 is energized for a second time in the fast-forward mode and the rewind mode, and the holding of the first trigger lever 15 and the second trigger lever 16 is released, Protrusions 26c, 2 projecting from the drive levers 26a, 26b on the stoppers 15a, 14a.
6d is brought into contact with the drive levers 26a and 26b to restrict the rotation thereof.

The first trigger lever 15 and the second trigger
First rotary lever 13 constituting the trigger lever 16 of
Are rotatably supported by support shafts 17a and 17b, respectively.
Are elastically coupled by. Also, the first trigger-
A wire spring 2 is provided between the lever 15 and the first rotating lever 13.
2 is interposed and the wire spring 22 is attached to the first trigger lever 15 in a state where the spring force is charged so as to urge the first rotating lever 13 in the clockwise direction. The operating element 12 of the self-holding solenoid 11 is connected to one end of the second trigger lever 16. The self-holding solenoid 11 holds the operating element 12 by a magnetic force and is energized to release the holding of the operating element 12. Further, a main coil spring 18 is connected to one end side of the first rotary lever 13 constituting the second trigger lever 16, and the first rotary lever 13 is rotated counterclockwise. Energized to move. Further, an auxiliary coil spring 19 is installed between the other ends of the first and second turning levers 13 and 14, and the first turning lever 13 and the second turning lever 14 are elastic. Is bound to. In addition, the first and second rotation levers-13, 14
A wire spring 20 is interposed between the wire spring 20 and the first rotating lever 13 so as to urge the second rotating lever 14 in the clockwise direction. It is installed.

Further, the pair of delaying rotation levers 41 for delaying.
A cam switch 51 that is turned on and off by the rotation of the delay levers 41a and 41b is provided between a and 41b, and the cam switch 51 detects the rotational position of the cam. ..

The first and second trigger-lever-1
Brakes 55a and 55b are provided on the protrusions 5 and 16, and these brakes 55a and 55b are self-holding solenoids 11.
When the holding of the operator 12 is released and the first and second trigger levers 15 and 16 are rotated, the rotation is performed by meshing with the first and second reel gears 5 and 6. Are regulated.

On the other hand, a magnetic head support plate 80 extending along the pinch roller / magnetic head insertion window of a tape cassette (not shown) is arranged on the upper surface of the support member 36. A pair of recording / reproducing heads 82a and 82b are attached to the magnetic head supporting plate 80 on both sides of the capstan 52 with their core gaps facing the pinch roller / magnetic head insertion window of the tape cassette. ing.

The above-mentioned pinch roller / roller is attached to the support member 36 at positions corresponding to both longitudinal ends of the magnetic head support plate 80.
A pair of guide holes 86a, 86b extending in a direction orthogonal to the magnetic head insertion window are formed, and the pair of guide holes 86a, 86b are provided downward from both ends of the magnetic head support plate 80. A pair of projecting and fixed guide pins 88a and 88b are inserted.

On the lower surface side of the support member 36, the downward protrusions of the pair of support shafts 90a and 90b and the magnetic head support plate 8 are provided.
A pair of toggle springs 92 using a torsion coil spring are provided between the pair of guide pins 88a and 88b at both ends of 0.
Both ends of a and 92b are hooked. Each of the pair of toggle springs 92a and 92b has a pair of guide pins 88 at both ends of the corresponding magnetic head support plate 80.
The a and 88b are urged to one end or the other end in the longitudinal direction with the intermediate position in the longitudinal direction as a boundary in the corresponding pair of guide holes 86a and 86b.

While the stop mode is set in the tape recorder, the magnetic head support plate 80 is rotated by the pair of interlocking levers 29a and 29b, so that the pair of guide pins 88a and 88b. Is moved and a pair of guide pins 8
8a, 88b downward protrusions to a pair of toggle springs 92a,
The pair of guide holes 8 of the support member 36 are urged by the urging force of 92 b.
6a and 86b, which is located farthest from the pinch roller / magnetic head insertion window of the tape cassette (FIG. 2).
State). In this state, the magnetic head support plate 80 is arranged in parallel with the pinch roller / magnetic head insertion window, and the pair of recording / reproducing heads 82a and 82b are arranged at a predetermined distance from the magnetic head pinch roller / insertion window. It is separated.

Incidentally, FIG. 3 shows a play mode on a tape recorder.
One state is shown while the mode is set, in which the magnetic head support plate 80 has one guide pin 8
8a in the corresponding guide hole 86a and the pinch roller /
While being held at the end farther from the magnetic head insertion window, the guide pin 88b on the other side is also held at the corresponding guide hole 8
6b is moved to the end closer to the pinch roller / magnetic head insertion window. Thereby, the magnetic head support plate 8
0 is inclined with respect to the pinch roller / magnetic head insertion window, and the recording / reproducing head 82b near the other guide pin 88b is inserted into the pinch roller / magnetic head insertion window in the tape cassette. Of magnetic tape 32a. In the above state, the magnetic tape 32a is connected to one reel.
The reel shaft 34b is wound around the other reel shaft 34a.

While the stop mode is set in the tape recorder, the parallel state (not shown) is set while the play mode is set in the tape recorder as shown in FIG.
The transition to the above-mentioned tilted state shown in FIG. 2 will be described in detail later.

On the upper surface side of the support member 36, one of the support shafts 90b is attached to the pinch roller / of the tape cassette.
A pair of recording / reproducing heads 82a, 82b on the magnetic head supporting plate extending toward the other supporting shaft 90a along the magnetic head inserting window rotatably supports a base end of a pinch roller lever (not shown). ing.

The pinch roller is a pair of recording / reproducing head 8
A pinch roller 95 is rotatably supported at a position corresponding to the capstan 52 in the middle of 2a and 82b.

The pinch roller lever is biased by a spring 97. The urging force of the spring 97 urges the pinch roller lever toward the pin cassette roller / magnetic head insertion window of the tape cassette, but while the stop mode is set in the tape recorder. The pinch roller lever abuts the integrally formed engaging claw 94 with the edge of the engaging opening 80a of the magnetic head support plate 80 to resist the biasing force of the spring 97 and to move the pinch roller 95 of the tape cassette. It is separated from the pinch roller / magnetic head insertion window by a predetermined distance.

The biasing force applied from the spring 97 to the pinch roller lever is in the opposite direction to the biasing force applied to the magnetic head support plate 80 from the pair of toggle springs 92a and 92b in the stop mode setting state. And, it is slightly larger than the latter. But tape-
While the stop mode is set in the carriage, the magnetic head support plate 80 is moved by the pair of guide pins 88 by the interlocking levers 29a and 29b controlled by the cam gears 25a and 25b.
Since a and 88b are held, pinch roller lare lever
Of the magnetic head support plate 80 by the urging force of the spring 97 of
Together with the pinch roller lever 94 approaches the pinch roller / magnetic head insertion window of the tape cassette and the pinch roller 9
No one of the pair of recording / reproducing heads 82a and 82b is inserted into the pinch roller / magnetic head insertion window together with the magnetic tape 5 and the magnetic tape 32a is contacted.

In the tape pre-coder according to the embodiment of the present invention constructed as described above, the operation button (not shown) for the pre-mode exposed on the outer surface of the exterior housing is operated. When the play mode is set, the bidirectional motor 58 rotates the output pulley 58a in one direction (clockwise direction), for example. As a result, the drive belt 60 travels, the capstan 52 and the flywheel 54 also rotate to one side, the main gear 1 rotates, and the rotation lever-2 rotates clockwise. The rotation of the main gear 1 causes the first and second idlers-3 and 4 to rotate,
By the rotation of the rotation lever-2, the second idler gear 4 is meshed with the large diameter gear portion 39d of the step gear 39b,
The step gear 39b is rotated clockwise. Rotation lever
When 2 is rotated by a predetermined angle, it comes into contact with the stopper portion 42b of the delayed rotation lever 41b and stops at a position where the first idler gear 3 does not mesh with the first reel gear 5. At this time, the self-holding solenoid 11 is energized,
The holding of the operator 12 is released. As a result, the first and second trigger levers 15 and 16 are brought into a free state, and the second trigger lever 16 is moved to the coil spring 18
Alternatively, both of the urging forces of 18 and 19 rotate counterclockwise around the support shaft 17b, and this rotation causes the first trigger lever 15 to pass through the coil spring 21 and the wire spring 22. Is rotated clockwise.
By the rotation of the first and second trigger levers 15 and 16, the pins 19a and 19b of the rotation ends move outward and come into contact with the cams on the back surface of the cam gears 25a and 25b, respectively. The contact force rotates the cam gears 25a and 25b by a predetermined angle. As a result, the toothless portions of the first and second cam gears 25a and 25b are moved so that the tooth portions are meshed with the small-diameter gear portions 39c of the step gears 39a and 39b, respectively. At this time, since the step gears 39a and 39b rotate only one of the step gears 39b, the second cam gear 25b
Only rotate.

By the rotation of the second cam gear 25b,
First, the pin 49b of the drive lever 26b is connected to the cam gear 25b.
When relatively moved by the cam 74 on the front surface side and moved for a predetermined distance, it falls into the groove 79 and moves along the inner cam surface 74a. As a result, the drive lever 26b is attached to the support shaft 2
It rotates counterclockwise about 7b. By this rotation, the rotation restriction of the interlocking lever 29b is released, whereby the magnetic head support plate 80 together with the pinch roller lever is rotated by the spring 97 with the other guide pin 88a as the rotation center of the tape cassette. Rotate toward the pinch roller / magnetic head insertion window.

When the pinch roller lever is rotated, the pinch roller 95 is inserted into the pinch roller / magnetic head insertion window to press the magnetic tape 32a against the capstan 52 and to cap the magnetic tape 32a. It stops by pinching in cooperation with the stun 52.

The above-mentioned rotation of the magnetic head support plate 80 is performed by one guide pin 8 of the magnetic head support plate 80 as shown in FIG.
The downward protruding portion of 8b is urged by the corresponding toggle spring 92b in the corresponding guide hole 86b to cause the pinch roller /
It stops by being brought into contact with the end on the magnetic head insertion window side, and at this time, the recording / reproducing head 82b in the vicinity of one guide pin 88b is inserted into the pinch roller / magnetic head insertion window and the magnetic tape is inserted. -Abutted on the boss 32a.

As described above, after one head 82b is brought into contact with the magnetic tape 32a, the cam gear 25b is rotated, and this time the pin 49b of the delay rotation lever 41b is moved by the cam on the back side of the cam gear 25b. The delayed rotation lever 41b is moved and rotated in the counterclockwise direction, and the stopper portion 42b thereof is separated from the rotation lever-2. As a result, the rotation lever-2 further rotates by a predetermined angle and comes into contact with the stopper 57 to stop the rotation, and the first idler gear 3 meshes with the first reel gear 5 so that the first idler gear 3 meshes with the first reel gear 5. The reel gear 5 of No. 1 is rotated. By this rotation, the other reel shaft 34
A recording / reproducing head 82b picks up a signal from a magnetic tape 32a pulled out from a reel hub (not shown) at a predetermined speed and sends it to an electric circuit (not shown) for reproduction from a speaker.
A reel hub (not shown) on one reel shaft 34a winds up the magnetic tape 32a delivered from the capstan 52 and the pinch roller 95 at a predetermined speed.

A reel (not shown) on the other reel shaft 34b.
When the magnetic tape 32a reaches the end of the hub, the well-known end detecting means provided in the outer housing of the tape recorder operates to perform the stop operation. Then, the self-holding solenoid 12 is energized to operate the operator 1.
The holding of 2 is released. As a result, the cam gear 25b rotates, and the pin 49b moves due to the cam on the front surface side. With this, the drive lever 26b and the interlocking lever 29b also move and the guide pin 88b retracts. As a result, the magnetic head 82b also separates from the tape 32a and enters the stop mode. Then, after that, the motor 58 is reversed.

When the drive motor 58 is reversed, the output pulley 5
By the rotation of 8a to the other side, the drive belt 60 travels in the opposite direction to that in the above-mentioned pre-play, and the flywheel 54 rotates in the opposite direction. Due to this rotation, the main gear 1 and the rotation lever-2 are rotated in the opposite directions, the first and second idler gears 3 and 4 are also rotated in the opposite directions, and the reverse rotation of the rotation lever-2 is performed. By the rotation in the direction, the first idler gear 3
Is meshed with the step gear 39a, the step gear 39a is rotated, and thereby the first cam gear 25a is rotated.

When the rotating lever-2 is rotated by a predetermined angle, it comes into contact with the stopper portion 42a of the delay rotating lever 41a so that the second idler gear 3 meshes with the first reel gear 5. It is stopped at a position that does not. The rotation of the first cam gear 25a causes the other reel shaft 34 by the interlocking lever 29a.
The pressing of the downward protruding portion of the other guide pin 88a of the magnetic head supporting plate 80 farther from b is released. By this release, the magnetic head support plate 80 moves together with the pinch roller lever 94 by the urging force of the spring 97 with one guide pin 88b as the center of rotation for the tape cassette pinch roller.
La / Rotate toward the magnetic head insertion window.

When the pinch roller lever is rotated, the pinch roller 95 is inserted into the pinch roller / magnetic head insertion window to press the magnetic tape 32a against the capstan 52 and to cap the magnetic tape 32a. It stops by pinching in cooperation with the stun 52.

The above-mentioned rotation of the magnetic head support plate 80 is caused by the biasing force of the toggle spring 92a corresponding to the downward protrusion of the other guide pin 88a of the magnetic head support plate 80 in the corresponding guide hole 86a. The recording / reproducing head 82a in the vicinity of the other guide pin 88a is inserted into the pin chiller / magnetic head insertion window at the time when the recording / reproducing head 82a near the other guide pin 88a is inserted into the magnetic head insertion window. -Pop 3
2a is contacted.

As described above, the recording / reproducing head 32
When the cam gear 25a is rotated after being contacted with a, the pin 49 of the delay rotation lever 41a is moved this time.
The rotation lever for delay is moved by the cam on the back side of a.
41a is rotated clockwise, and the stopper portion 42a thereof is separated from the rotation lever-2. Thereby, the rotation lever-2
Is further rotated by a predetermined angle to contact the stopper 57 to stop the rotation, and the second idler gear 4 is moved to the second position.
The second reel gear 6 is rotated by meshing with the second reel gear 6. Due to this rotation, the magnetic tape 3 pulled out at a predetermined speed from a reel hub (not shown) on the reel shaft 34a.
The recording / reproducing head 82a picks up a signal from 2a and sends it to an electric circuit (not shown) for reproduction from a speaker. The other reel shaft 3
A reel hub (not shown) on 4b winds up the magnetic tape 32a sent out from the capstan 52 and the pinch roller 95 at a predetermined speed.

Next, the case of setting the fast-forward mode will be described.

In this case, the fast-forward mode setting button (not shown) is continuously pressed twice. This fast-forward mode
The operation at the time of the mode is the same as the operation at the time of the pre-mode until the middle. That is, if you set the fast-forward mode,
The bidirectional motor 58 rotates the output pulley 58a in one direction. As a result, the drive belt 60 travels and the capstan 52 and the flywheel 54 also rotate to one side,
The main lever 1 is rotated and the rotary lever-2 is rotated clockwise. The rotation of the main gear 1 causes the first and second idler gears 3 and 4 to rotate, and the rotation of the rotation lever-2 causes the second idler-4 to move to the large diameter teeth of the step gear 39b. The step gear 39b is rotated by meshing with the portion 39d. When the rotation lever-2 is rotated by a predetermined angle,
It comes into contact with the stopper portion 42b of the delay rotation lever 41b and stops at a position where the first idler gear 3 does not mesh with the first reel gear 5. At this time, the self-holding solenoid 11 is energized for the first time, and the holding of the operating element 12 is released. As a result, the first and second trigger levers-15 and 16 are brought into the free state, and the second trigger lever 16 is set to the coil spring 18 or 18 and 19.
By both of the urging forces of (1) and (2), the first trigger lever 15 is rotated counterclockwise about the support shaft 17b, and the first trigger lever 15 is rotated clockwise by the coil spring 21 and the wire spring 22. It is rotated. Due to the rotation of the first and second trigger levers 15 and 16, the pins 19a and 19b of the rotation ends move outward and come into contact with the cams on the back side of the cam gears 25a and 25b, respectively. The contact force rotates the first and second cam gears 25a and 25b by a predetermined angle. Thereby, the cam gears 25a, 2
The tooth-missing portion of 5b is moved so that the tooth portions have step gears 39a, 39b.
Are engaged with each other. At this time, the stepped gears 39a, 39
b is the second gear because only one stage gear 39b is rotating.
Only the cam gear 25b of the above rotates.

By the rotation of the second cam gear 25b,
First, the pin 47b of the drive lever 26b is connected to the cam gear 25b.
At this time, the self-holding solenoid 11 is energized for the second time and the second electric power is applied to the self-holding solenoid 11 at this time. The holding of the trigger lever 16 is released, and the second trigger lever 16 is again rotated counterclockwise. Therefore, when the drive lever 26b tries to rotate in the counterclockwise direction, the stop portion 14a formed on the second rotation lever 14 constituting the second trigger lever 16 is formed.
The projection 26d of the drive lever 26b comes into contact with and is stopped, and its rotation is restricted. Therefore, the pin 47b slides along the outer cam surface 74b without falling into the groove 79. Therefore, the rotation of the interlocking lever 29b is also restricted, the magnetic head support plate 80 does not operate together with the pinch roller lever, and the recording / reproducing head 82b remains separated from the magnetic tape 32a. Located in.

As described above, the recording / reproducing head 82b is operated by the magnetic tape.
When the cam gear 25b is further rotated in a state of being separated from the cam 32a, this time, the pin 47b of the delay rotation lever 41b is moved by the cam on the front surface side of the cam gear 25b and the delay rotation lever 41b is moved. Rotated counterclockwise,
The stopper portion 42b is separated from the rotation lever-2. As a result, the rotation lever-2 further rotates clockwise by a predetermined angle and comes into contact with the stopper 57 to stop the rotation, and the first idler gear 3 moves to the first reel gear 5. The first reel gear 5 is rotated by meshing with the magnetic tape 3
2a is wound up at high speed.

The rewind mode is different from the above-described fast-forward mode in that the bidirectional motor 58 rotates in the opposite direction, and the other cam gear 25a is rotated. The operation is the same.

As described above, the head support member 80 is operated by the rotation of the first and second cam gears 25a and 25b, and the first and second recording / reproducing heads 82a and 82b.
Can be selectively moved in and out to be brought into contact with and separated from the magnetic tape 32a, so that the diameter of the cam mechanism can be made small and the size can be reduced.

[0064]

As described above, according to the present invention,
A pair of heads selectively used corresponding to the traveling direction of the tape are attached, and a swingable head support member;
A first cam mechanism that drives a head support member to bring one head into contact with the tape and the first cam mechanism can operate independently of each other, and the other head comes into contact with the tape. Since the second cam mechanism for driving the head support member is provided to enable the head support member to be operated, the diameter of the cam mechanism can be reduced as compared with the case where the head support member is operated by a single cam mechanism. This has the effect of reducing the size of the entire device.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a tape recorder equipped with a head moving device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged plan view showing the state of the tape recorder of FIG. 1 in a stop mode.

FIG. 3 is a plan view showing a partially enlarged view of the tape recorder of FIG. 1 in a pre-mode.

4 is a plan view showing a first cam mechanism provided in the head moving device in FIG. 1. FIG.

5 is a plan view showing a second cam mechanism provided in the head moving device of FIG. 1. FIG.

FIG. 6 is a plan view showing a head support member operated according to FIGS. 4 and 5;

7 is a front view showing a meshed state of a cam gear and a step gear provided in the head moving device of FIG.

[Explanation of symbols]

25a ... 1st cam mechanism, 25b ... 2nd cam mechanism, 3
2a ... tape, 82a. 82b ... a pair of heads, 80 ...
Head support member.

Claims (1)

[Claims] 1. A pair of heads, which are selectively used in correspondence with the traveling direction of a tape, are attached to the head support member, and one head is brought into contact with the tape. A first cam mechanism for driving the head supporting member, and a second cam which is operable independently of the first cam mechanism and drives the head supporting member for bringing the other head into contact with the tape. A head moving device comprising: a mechanism.