JP3221723B2 - Head moving device - Google Patents

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, for example, a head of a tape recorder.

[0002]

2. Description of the Related Art A tape recorder is provided with a pair of reel shafts. A tape is wound between the pair of reel shafts, and the reel shaft is rotated forward and reverse to form a tape reel. The vehicle is driven in one direction or the other.

In the pre-mode, the head is moved to come into contact with the tape, and in the stop mode or the fast-forward mode, the head is moved in the reverse direction to move away from the tape. It is made to let.

Some tape recorders have a pair of heads so that the pair of heads can be used by selectively contacting the tape.

The pair of heads are attached to a head support member, and the head is selectively moved in and out by the operation of the head support member to come into contact with the tape.

[0006]

However, in the prior art, since the head support member is operated by a single cam mechanism, the diameter of the cam mechanism becomes large, and the operation area of the cam mechanism is required to be wide, so that the entire apparatus is required. However, there is a problem that the size of the device increases.

Accordingly, the present invention provides a head moving device which allows a pair of heads to move selectively by operating a head support member without increasing the diameter of a cam mechanism. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a first head and a second head selectively used in accordance with a running direction of a tape . of
A head support member to which a head is attached and which can swing,
Both the first head and the second head are taped.
From the state in which the first head is separated from the
A first driving means for driving the head supporting member so as to contact the
Cam mechanism, the first head and the second head
Both the tapes are separated from the tape.
Head support member so that only the pad contacts the tape.
A second cam machine different from the first cam mechanism for driving
Structure . According to a second aspect of the present invention, there is provided a drive mechanism for driving a capstan disposed at a predetermined distance from a line connecting the pair of reel shafts, substantially in the middle of the pair of reel shafts over which the tape is wound. Both the first cam mechanism and the second cam mechanism are configured to obtain a driving force via the driving mechanism.

[0009]

The cam mechanism for operating the head support member is divided into first and second cam mechanisms and independently operated, so that the configuration of the cam mechanism can be made compact.

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

This tape recorder uses a known tape cassette called a so-called micro-cassette. When the end of the magnetic tape is detected by known end detecting means during operation, an auto-reverse method is used. Changes the running direction of the magnetic tape.

In a substantially rectangular exterior housing (not shown) of the tape recorder, the base ends of a pair of reel shafts 34a and 34b on which a pair of reel hubs of the microcassette are mounted are rotatable. A flat plate-like support member 36 supported horizontally is stored horizontally, and the support member 36 is made of a non-magnetic material such as a fiber-reinforced synthetic resin or stainless steel.

Note that 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 hereinafter drawn without the support member 36 for convenience.

The support member 36 has a pair of reel shafts 34a and 34 substantially at the center of the pair of reel shafts 34a and 34b.
b at a position separated from the line connecting b by a predetermined distance.
The two base ends are 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.

The lower surface of the support member 36 further includes
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 supported by a support member 3 by a mounting member (not shown).
6 is fixed to the lower surface.

An output pulley 58a is fixed to an 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 fixed concentrically to the base end of the capstan 52, and a rotation lever-2 as a rotation member is rotatably supported. I have. A first idler gear 3 is rotatably mounted on one end of the lower surface of the rotary lever-2, and a second idler gear 4 is rotatably mounted on the other end of the lower surface.

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

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 rotating lever-2.
The first and second idler gears 3 and 4 are moved and selectively meshed with each other by the rotation in the forward and reverse directions.

In the movement path of the first and second idler gears 3 and 4, step gears 39a and 39b composed of a small diameter gear portion 39c and a large diameter gear portion 39d are rotatably arranged. . Near the step gears 39a and 39b, first and second cam gears 25a and 25b constituting first and second cam mechanisms are rotatably arranged.
These cam gears 25a, 25b are connected to the step gears 39a, 3
The small-diameter gear portion 39c of 9b is engaged with the small-diameter gear portion 39c.
Missing tooth portions (not shown) are formed on both sides of the cam gears 25a and 25b.
Each time 5b is rotated by 180 °, it faces the small-diameter gear portion of the step gears 39a and 39b, and the rotation is stopped.

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

A groove 79 is formed in 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 first and second cam gears 25a, 25
The outer peripheral portion of the step gear 39d in the play state shown in FIGS.
5c is formed, and the step 25 is formed by the step gears 39a,
The large-diameter gear portion 39b is opposed to the peripheral edge portion on the back surface side of the large-diameter gear portion 39d.

Due to the formation of the stepped portion 25c, the outer peripheral portions of the cam gears 25a and 25b on the surface side are connected to the stepped gear 39.
a, 39b between the large-diameter gear portion 29d and the peripheral portion on the back side of the large-diameter gear portion 29d become large, and the first and second cam gear 25
a, 25b when the step gears 39a, 39b
To prevent noise from being generated during the play state.

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 are biased by these coil springs 28a and 28b so that the driving lever 26a rotates clockwise and the driving lever 26b rotates counterclockwise. Pins 49a, 49b are provided on the lower surfaces of these drive levers 26a, 26b.
The pins 49a and 49b are in contact with the cam surfaces of the cams 74 on the front surfaces of the cam gears 25a and 25b.

Protrusions 26c and 26d are formed on the outer upper side of the drive levers 26a and 26b in the drawing, and these protrusions 26c and 26d are used in a fast-forward mode and a rewind mode, as will be described later. The drive levers 26a and 26b are respectively brought into contact with the stopper 15a of the trigger lever 15 and the stopper 14a of the second trigger lever 16.
Is restricted.

The pins 49a and 49b fall into the groove 79 in the pre-mode and relatively move along the inner cam surface 74a. In the fast-forward mode and the rewind mode, a trigger which will be described later is used. The operation of levers 15 and 16
It does not fall into the groove 79 and relatively moves along the outer cam surface 74b.

The lower ends of the drive levers 26a and 26b in the drawing are in contact with the rotating edges of the interlock levers 29a and 29b. These interlock levers 29a, 29
b is rotatably supported by support shafts 90a and 90b. Engagement holes 45a, 45b are formed in the rotating portion side of these interlock levers 29a, 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 step gears 39a, 39b, delaying rotation levers 41a, 41b are provided rotatably coaxially. These delay rotation levers 41a,
Pins 47a and 47b project upward from one end of 41b, and stoppers 42a and 42b are formed at the other end. The coil springs 43a, 43b are connected to the delay rotation levers 41a, 41b, respectively. The delay rotation lever 41a is counterclockwise, and the delay rotation lever 41b.
Are biased to rotate clockwise. The pins 47a and 47b of the delay rotation levers 41a and 41b are in contact with the cams on the back surfaces of the cam gears 25a and 25b. The stopper portions 42a and 42b of the delay rotation levers 41a and 41b are provided with 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 rotation lever 2 to temporarily restrict the rotation thereof. 32a is not allowed to run.

When the cam gears 25a, 25b rotate, the pins 49a, 49b of the drive levers 26a, 26b are operated first, and then the cam gears 25a, 25b have a slight time difference. Rotating lever 41
a, 41b are formed so as to operate the pins 47a, 47b.

The rotating end portions 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 includes first and second rotation levers 13 and 14, and the first and second rotation levers 13 and 14 are provided on the same support shaft 1.
7b rotatably supported. A pin 19a, a pin 19a, is provided at the rotation end of the second rotation lever 14 constituting the first trigger lever 15 and the second trigger lever 16.
The pins 19a and 19b are respectively provided so as to protrude upward, and the pins 19a and 19b are in contact with the cams on the rear surfaces of the cam gears 25a and 25b.

A stopper portion 15a is protruded from an outer portion of the first trigger lever 15 in the drawing, and a second
Second rotary lever 14 which constitutes the trigger lever 16 of FIG.
A stopper portion 14a is protruded from the outer portion in FIG. In the fast-forward mode and the rewind mode, when the self-holding solenoid 11 is energized for the second time and the first trigger lever 15 and the second trigger lever 16 are released, Protrusions 26c, 2 protruding from the drive levers 26a, 26b on the stoppers 15a, 14a.
6d is abutted to restrict the rotation of the drive levers 26a, 26b.

The first trigger lever 15 and the second trigger lever 15
First rotating lever 13 constituting the trigger lever 16 of FIG.
Are rotatably supported by support shafts 17a and 17b, respectively.
Are elastically connected to each other. Also, the first trigger
A wire spring 2 is provided between the lever 15 and the first rotating lever 13.
2, the wire spring 22 is attached to the first trigger lever 15 in a state where the spring force is charged so as to bias the first rotation lever 13 clockwise. An operator 12 of a 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 magnetic force, and releases the holding of the operating element 12 when energized. A main coil spring 18 is connected to one end of the first rotary lever 13 constituting the second trigger lever 16, and the first rotary lever 13 rotates counterclockwise. It is biased to move. Further, an auxiliary coil spring 19 is provided between the other ends of the first and second rotation levers 13 and 14, and the first rotation lever 13 and the second rotation lever 14 are elastic. Is joined to. Further, the first and second rotating levers 13 and 14
A wire spring 20 is interposed between the wire springs 20, and the wire spring 20 is charged with a spring force on the first rotation lever 13 to bias the second rotation lever 14 clockwise. Installed.

Further, the pair of delay rotation levers 41 are provided.
A cam switch 51 which is turned on and off by the rotation of the delay rotation levers 41a and 41b is provided between the cam switches 51a and 41b. The cam switch 51 detects the rotation position of the cam. .

The first and second trigger levers-1
Brakes 55a and 55b are protruded from 5, 5 and 16, and these brakes 55a and 55b are self-holding type solenoids 11.
When the first and second trigger levers 15 and 16 are rotated by releasing the holding of the operation element 12 of the first gear, the first and second reel gears 5 and 6 mesh with the first and second reel gears 5 and 6 to rotate. Is regulated.

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

At positions corresponding to both longitudinal ends of the magnetic head support plate 80, the pinch rollers /
A pair of guide holes 86a and 86b extending a predetermined distance in a direction perpendicular to the magnetic head insertion window are formed. The pair of guide holes 86a and 86b are formed from both ends of the magnetic head support plate 80 downward. A pair of guide pins 88a and 88b protruding and fixed are inserted.

On the lower surface side of the support member 36, the lower protruding portions of the pair of support shafts 90a and 90b and the magnetic head support plate 8
A pair of toggle springs 92 using a torsion coil spring are provided between a pair of guide pins 88a and 88b at both ends of the pair of zero.
Both ends of each of a and 92b are latched. Each of the pair of toggle springs 92a and 92b is provided with a pair of guide pins 88 at both ends of the corresponding magnetic head support plate 80.
a and 88b are urged in the corresponding pair of guide holes 86a and 86b toward one end or the other end in the longitudinal direction at an intermediate position in the longitudinal direction.

While the stop mode is set in the tape recorder, the magnetic head supporting plate 80 is rotated by the pair of interlocking levers 29a and 29b to rotate the pair of guide pins 88a and 88b. Is moved to a pair of guide pins 8.
8a, 88b are connected to a pair of toggle springs 92a,
The pair of guide holes 8 of the support member 36 are generated by the urging force of the 92b.
6a and 86b, which are 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 disposed in parallel with the pinch roller / magnetic head insertion window, and the pair of recording / reproducing heads 82a and 82b is moved a predetermined distance from the magnetic head pinch roller / insertion window. Separated.

FIG. 3 shows a play mode in the tape recorder.
7 shows one state while the magnetic head is set, in which the magnetic head support plate 80 is connected to one of the guide pins 8.
8a in the corresponding guide hole 86a.
The guide pin 88b is held at the end remote from the magnetic head insertion window, and the other guide pin 88b is held in the corresponding guide hole 8.
6b, it is moved to the end closer to the pinch roller / magnetic head insertion window. Thereby, the magnetic head support plate 8
No. 0 is disposed obliquely 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 to insert the tape in the tape cassette. Of the magnetic tape 32a. In the above state, the magnetic tape 32a is connected to one of the leads.
The reel shaft 34b is wound around the other reel shaft 34a.

Note that while the stop mode is set in the tape recorder, the parallel state (not shown) from the above-described parallel state while the play mode is set in the tape recorder is shown in FIG.
The transition to the above-described inclined state shown in FIG. 7 will be described later in more detail.

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

The pinch roller is a pair of recording / reproducing heads 8.
A pinch roller 95 is rotatably supported at a position corresponding to the capstan 52 at an intermediate position between 2a and 82b.

The pinch roller lever is urged by a spring 97. The urging force of the spring 97 urges the pinch roller lever toward the pinch roller / magnetic head insertion window of the tape cassette. However, while the stop mode is set in the tape recorder, the pinch roller lever is biased. The pinch roller lever pushes the pinch roller 95 against the urging force of the spring 97 by bringing the integrally formed engaging claw 94 into contact with the edge of the engaging opening 80a of the magnetic head support plate 80 so that the tape cassette can be inserted into the tape cassette. It is separated from the pinch roller / magnetic head insertion window by a predetermined distance.

The biasing force applied to the pinch roller lever from the spring 97 is opposite in direction to the biasing force applied to the magnetic head support plate 80 from the pair of toggle springs 92a and 92b in the above-described stop mode setting state. And slightly greater than the latter. But tapek-
While the stop mode is set in the slider, the magnetic head supporting plate 80 is driven by the interlocking levers 29a and 29b controlled by the cam gears 25a and 25b to form a pair of guide pins 88.
a, 88b are held, so that the pinch roller lever
Of the magnetic head support plate 80 by the urging force of the spring 97 of FIG.
Together with the pinch roller lever 94, approaches the pinch roller / magnetic head insertion window of the tape cassette and moves to the pinch roller 9;
One of the pair of recording / reproducing heads 82a and 82b is not inserted into the pinch roller / magnetic head insertion window along with 5, and does not come into contact with the magnetic tape 32a.

In the tape recorder according to an embodiment of the present invention having the above-described structure, the operation button (not shown) for the pre-mode, which is 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, for example, in one direction (clockwise). As a result, the drive belt 60 is run, the capstan 52 and the flywheel 54 are also rotated to one side, the main gear 1 is rotated, and the rotating lever 2 is rotated clockwise. By the rotation of the main gear 1, the first and second idlers-3, 4 are rotated,
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. The above-mentioned rotating lever
2 is rotated by a predetermined angle, comes into contact with the stopper 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,
The holding of the operation element 12 is released. As a result, the first and second trigger levers 15 and 16 are in a free state, and the second trigger lever 16 is in the coil spring 18 position.
Alternatively, the first trigger lever 15 is rotated through the coil spring 21 and the wire spring 22 by being rotated counterclockwise about the support shaft 17b by the urging forces of both 18 and 19. Is rotated clockwise.
The rotation of the first and second trigger levers 15 and 16 causes the pins 19a and 19b at the rotation ends thereof to move outward and abut against the cams on the rear surfaces of the cam gears 25a and 25b, respectively. The cam gears 25a and 25b are rotated by a predetermined angle by the contact force. As a result, the missing tooth portions of the first and second cam gears 25a and 25b are moved, and the tooth portions mesh 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 are rotating only one step gear 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 it is relatively moved by the cam 74 on the front surface side and moves 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
It rotates counterclockwise about 7b. With this rotation, the rotation restriction of the interlocking lever 29b is released, so that the magnetic head support plate 80 is rotated by the spring 97 together with the pinch roller lever about the other guide pin 88a as the rotation center of the tape cassette. It rotates toward the pinch roller / magnetic head insertion window.

When the pinch roller 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 to cap the magnetic tape 32a. It stops by being pinched in cooperation with the stan 52.

The rotation of the magnetic head support plate 80 is performed by rotating one of the guide pins 8 of the magnetic head support plate 80 as shown in FIG.
8b in the corresponding guide hole 86b by the urging force of the corresponding toggle spring 92b.
At this point, the recording / reproducing head 82b near one of the guide pins 88b is inserted into the pinch roller / magnetic head insertion window, and stopped by contact with the magnetic head insertion window side end. -Abuts on the tape 32a.

As described above, after one head 82b is brought into contact with the magnetic tape 32a, the rotation of the cam gear 25b causes the pin 49b of the delay rotation lever 41b to be moved by the cam on the back side of the cam gear 25b. The delay rotation lever 41b is rotated counterclockwise by being moved, and the stopper 42b is separated from the rotation lever-2. As a result, the rotation lever-2 further rotates by a predetermined angle to abut on the stopper 57 to stop the rotation, and the first idler gear 3 meshes with the first reel gear 5 so that the first reel gear 5 meshes with the first reel gear 5. One reel gear 5 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 on the magnetic tape 32b, sends the signal to an electric circuit (not shown), and reproduces the signal from the speaker.
A reel hub (not shown) on one of the reel shafts 34a winds the magnetic tape 32a fed at a predetermined speed from the capstan 52 and the pinch roller 95.

A reel (not shown) on the other reel shaft 34b
When the magnetic tape 32a reaches the end of the tape hub, a known end detecting means provided in the exterior housing of the tape recorder operates to perform a stop operation. Then, the self-holding solenoid 12 is energized and
2 is released. As a result, the cam gear 25b rotates, and the pin 49b is moved by the cam on the front surface side, so that the driving lever 26b and the interlocking lever 29b also move, and the guide pin 88b is retracted. As a result, the magnetic head 82b is also separated from the tape 32a, and enters the stop mode. Then, the motor 58 is reversed.

When the driving motor 58 is inverted, the output pulley 5
Due to the rotation of 8a to the other side, the drive belt 60 is run in the opposite direction to the above-mentioned play time, and the flywheel 54 is rotated in the opposite direction. By this rotation, the main gear 1 and the rotating lever 2 are rotated in the opposite direction, the first and second idler gears 3 and 4 are also rotated in the opposite direction, and the rotation of the rotating lever 2 is reversed. Rotation of the first idler gear 3
Is meshed with the step gear 39a, and the step gear 39a is rotated, whereby the first cam gear 25a is rotated.

When the rotation lever-2 is rotated by a predetermined angle, the second idler gear 3 meshes with the first reel gear 5 by contacting the stopper 42a of the delay rotation lever 41a. Stopped in a position that does not. By the rotation of the first cam gear 25a, the other reel shaft 34 by the interlocking lever 29a.
The pressing of the lower protruding portion of the other guide pin 88a of the magnetic head support plate 80 farther from b is released. With this release, the magnetic head supporting plate 80 is moved together with the pinch roller lever 94 by the urging force of the spring 97 around the one guide pin 88b as the rotation center, and the pinch roller of the tape cassette is rotated.
Rotate toward the magnetic / magnetic head insertion window.

When the pinch roller is rotated, the pinch roller 95 is inserted into the pinch roller / magnetic head insertion window, and the magnetic tape 32a is pressed against the capstan 52 to cap the magnetic tape 32a. It stops by being pinched in cooperation with the stan 52.

The above rotation of the magnetic head support plate 80 is performed by the pinch roller / recess in the corresponding guide hole 86a due to the urging force of the corresponding toggle spring 92a of the lower projecting portion of the other guide pin 88a of the magnetic head support plate 80. At this point, the recording / reproducing head 82a near the other guide pin 88a is inserted into the pinch roller / magnetic head insertion window, and stopped by contact with the magnetic head insertion window side end. -Step 3
2a.

As described above, the recording / reproducing head has the timing tape 32.
After contact with the cam gear 25a, the pin 49 of the delay rotation lever 41a is turned by the rotation of the cam gear 25a.
a is moved by the cam on the back side of FIG.
41a is rotated clockwise, and its stopper 42a is separated from the rotation lever-2. Thereby, the rotating lever-2
Is further rotated by a predetermined angle to abut against the stopper 57 to stop the rotation, and the second idler gear 4 is moved to the second
The second reel gear 6 is rotated by meshing with the reel gear 6. By this rotation, the magnetic tape 3 pulled out from a reel hub (not shown) on the reel shaft 34a at a predetermined speed.
A recording / reproducing head 82a picks up a signal from 2a, sends it to an electric circuit (not shown), and reproduces it from a speaker. The other reel shaft 3
A reel hub (not shown) on 4b winds up the magnetic tape 32a fed at a predetermined speed from the capstan 52 and the pinch roller 95.

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

In this case, the fast-forward mode setting button (not shown) is pressed twice continuously. 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 up to the middle. That is, when the fast forward mode is set,
The bidirectional motor 58 rotates the output pulley 58a in one direction. As a result, the drive belt 60 is run, and the capstan 52 and the flywheel 54 are rotated in one direction.
As the main gear 1 is rotated, the rotating 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 rotary lever 2 causes the second idler-4 to rotate 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,
The first idler gear 3 stops at a position where the first idler gear 3 does not mesh with the first reel gear 5 by contacting the stopper portion 42b of the delay rotation lever 41b. At this time, the first energization of the self-holding solenoid 11 is performed, and the holding of the operation element 12 is released. As a result, the first and second trigger levers 15 and 16 are in a free state, and the second trigger lever 16 is moved by the coil springs 18 or 18 and 19.
Are rotated counterclockwise around the support shaft 17b by the two biasing forces, and the first trigger lever 15 is rotated clockwise through the coil spring 21 and the wire spring 22 by this rotation. It is turned. The rotation of the first and second trigger levers 15 and 16 causes the pins 19a and 19b at the rotation ends thereof to move outward and abut against the cams on the rear surfaces of the cam gears 25a and 25b, The first and second cam gears 25a and 25b are rotated by a predetermined angle by the contact force. Thereby, the cam gears 25a, 25
The toothless portion of 5b is moved and the tooth portions are shifted to the stepped gears 39a and 39b.
Respectively. At this time, the step gears 39a, 39
b is rotating only one of the step gears 39b.
Only the cam gear 25b 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.
When the self-holding solenoid 11 is turned on for the second time, the self-holding solenoid 11 is turned on for the second time. The holding of the trigger lever 16 is released, and the second trigger lever 16 rotates counterclockwise again. For this reason, when the drive lever 26b attempts to rotate in the counterclockwise direction, the stop portion 14a formed on the second rotation lever 14 forming the second trigger lever 16 is formed.
The projection 26d of the drive lever 26b is brought into contact with and stopped, and its rotation is regulated. Therefore, the pin 47b slides along the outer cam surface 74b without falling into the groove 79. Therefore, the rotation of the interlock lever 29b is also restricted, the magnetic head support plate 80 does not operate 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 a magnetic tape.
When the cam gear 25b is further rotated in a state where it is separated from the step 32a, the pin 47b of the delay rotation lever 41b is moved by the cam on the surface side of the cam gear 25b, and the delay rotation lever 41b is moved. Rotated counterclockwise,
The stopper 42b is separated from the rotary lever-2. As a result, the rotating lever-2 further rotates clockwise by a predetermined angle and abuts against the stopper 57 to stop the rotation, and the first idler gear 3 is connected to the first reel gear 5. The first reel gear 5 is rotated by meshing with the magnetic tape 3.
2a is wound at high speed.

The rewind mode is different from the above-mentioned fast-forward mode only in that the rotation direction of the bidirectional motor 58 is reversed 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 are operated.
Are selectively moved in and out of the magnetic tape 32a, so that the diameter of the cam mechanism can be reduced, and the size can be reduced.

[0064]

As described above, according to the first aspect of the present invention,
According to the invention described above, a pair of heads selectively used in accordance with the running direction of the tape are mounted, and a swingable head supporting member and one head are brought into contact with the tape. a first cam mechanism for driving the head support member, the first
And a second mechanism for driving a head supporting member to bring the other head into contact with the tape.
Therefore, the diameter of the cam mechanism can be reduced as compared with a case in which the head support member is operated by a single cam mechanism, and the entire apparatus can be downsized. Further, the tape according to claim 2 uses a tape.
The pair of reel shafts is located almost in the middle of the pair of reel shafts
Drive the capstan placed a predetermined distance from the connecting line.
A first driving mechanism and a second driving mechanism.
Both mechanisms obtain driving force via the above driving mechanism
With the configuration, the space occupied by the drive system can be saved.
This contributes to downsizing of the entire device.

[Brief description of the drawings]

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

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

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

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

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

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

FIG. 7 is a front view showing an engaged state of a cam gear and a step gear provided in the head moving device of FIG. 1;

[Explanation of symbols]

25a: first cam mechanism, 25b: second cam mechanism, 3
2a ... tape, 82a. 82b ... a pair of heads, 80 ...
Head support member.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Saito 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (56) References JP-A-60-61913 (JP, A) Hei 1-113842 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5/54

Claims (2)

(57) [Claims] 1. A tape - the first head and the second head is attached to be used selectively in correspondence to the traveling direction of the flop, and swingable head support member, said first head and the The second head is
From the state in which the first head is separated from the
A first driving means for driving the head supporting member so as to contact the
And the first head and the second head are both tapered.
From the state in which the second head is separated from the
Driving the head support member so as to contact the
And a second cam mechanism different from the first cam mechanism. 2. A drive mechanism for driving a capstan disposed at a predetermined distance from a line connecting the pair of reel shafts at a substantially middle position between the pair of reel shafts over which the tape is wound. The head moving device according to claim 1, wherein both the cam mechanism and the second cam mechanism are configured to obtain a driving force via the driving mechanism.