JPS634273Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cassette-type tape recorder that is used by installing a tape cassette containing magnetic tape, and in particular a cassette-type tape recorder that has been improved so that the tape cassette can be easily and reliably attached and detached. The company provides tape recorders.

Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment.

In the embodiments shown in FIGS. 1 to 9, the present invention is applied to a cassette tape recorder having an auto-reverse function.

The tape recorder in this embodiment electrically commands and controls drive operations in various operation modes.
The drive motor 1 and the second drive motor 50 for driving the tape are configured so that operations in all operation modes can be performed by driving the drive motors 1 and 50 in forward and reverse directions. There is.

First, as shown in FIG. 1, the first drive motor 1 applies decelerated rotational driving force to the worm gear 4 via the gear 3 provided on the rotating shaft 2, and the worm gear meshed with the worm gear 4. The wheel 5 is driven to rotate in the direction of the arrow A or the arrow in the figure. Here, the first drive motor 1 is constituted by a DC brushless motor or the like that can switch between forward rotation drive and reverse rotation drive. The worm wheel 5 has a gear portion 6 formed on its outer peripheral surface that meshes with the worm gear 4, and
Spiral cam grooves 7 and 8 are formed in opposite directions on the upper and lower surfaces, respectively.

A first formed on the upper surface of the worm wheel 5.
As shown in FIG. 2, in the cam groove 7 of
A first cam roller 11 provided at one end of the roller is engaged. This holder operating lever 10 has a support shaft 1
The cassette holder 13 is connected via a coil spring 15 to an auxiliary arm 14 of a cassette holder 13, which is vertically rotatable about the cassette holder 2. Note that the auxiliary arm 14 is
It is connected to the cassette holder 13 via a torque spring 16 attached to the support shaft 12. This torque spring 16 functions to absorb unnecessary external force when it is applied to the cassette holder 13 and prevent it from being applied to the holder operating lever 10.

Further, a second cam roller 22 provided at one end of a head operating lever 21 that is horizontally rotatable about a support shaft 20 is engaged with the second cam groove 8 formed on the lower surface of the worm wheel 5. has been done. This head operating lever 21 is connected to a head board 23 via a coil spring 24. The head board 20 is provided with a magnetic head 25 which is inserted into the tape cassette 30 mounted on the cassette holder 13.

In the tape recorder of this embodiment, as shown in FIG. The ejector lever 31 operates a micro switch 34 to detect that the tape cassette 30 has been installed. When the microswitch 34 is activated, a control device composed of a microprocessor (not shown) or the like is activated.
The solenoid plunger 35 and the first drive motor 1 are driven in normal rotation. Note that the ejector lever 31 is connected to the solenoid plunger 35.
is stopped during the eject operation, and the operating arm 36 is rotated about the support shaft 37 in the direction of arrow C in FIG. Cassette 3
0 from the cassette holder 13.

When the micro switch 34 operates and the first drive motor 1 is driven to rotate in the forward direction, the worm wheel 5 is rotated by the drive motor 1 via the worm gear 4 in the direction of arrow A in FIG. , the first cam roller 11 engaged with the first cam groove 7 is guided and moved toward the outer circumference, and the holder operating lever 10 is rotated in the direction of arrow _A1 in FIG. In this way, when the holder actuating lever 10 is driven by the first cam groove 7, the auxiliary arm 14 connected to the holder actuating lever 10 via the coil spring 15 moves as indicated by the arrow A 2 in _FIG . , and the cassette holder 13 is lowered.

Further, when the first drive motor 1 is driven in the normal rotation, the worm wheel 5 rotates the second cam roller 22 that is engaged with the second cam groove 8 around the outer periphery, as shown in FIG. 4, and rotate the head operating lever 21 in the direction of arrow _A3 in FIG. When the head operating lever 21 is driven in this way, the head substrate 2 connected to the head operating lever 21 via the coil spring 24 is moved.
3 moves forward in the direction of arrow _A4 in FIG. 4 so as to insert the magnetic head 25 disposed on the head board 23 into the tape cassette 30.

Here, the first and second cam grooves formed in the worm wheel are designed to give a time difference between the driving of the operating levers 10 and 21, and to move the magnetic head 25 forward after the cassette holder 30 has descended. A mechanical phase difference is provided between 7 and 8. In this example, the worm wheel 5 is rotated by about 320 degrees by the first drive motor 1, and the driving state by each cam groove 7, 8 is as shown in FIG. Assigned as shown in . The 80° angle shown in FIG. 5 indicates an operating mode for separating the magnetic head 25 and the magnetic tape by a predetermined amount in fast-forwarding and rewinding operations to be described later.

In this manner, in this embodiment, the tape cassette 30 can be loaded by driving the first drive motor 1 in normal rotation.

When the first drive motor 1 is driven in the reverse direction, the worm wheel 5 is rotated in the direction of the arrow in FIG. After evacuating to the cassette holder 1
3 is operated to raise and can perform an unloading operation. Further, in this embodiment, as shown in FIG. 4, the head substrate 23 is also provided with cam grooves 40
is provided, and by the guidance of this cam groove 40,
The rotational movement of the locking arm 42, which is pivotable about the support shaft 41, is linked to the forward and backward movement of the magnetic head 25. The locking arm 42 is used to prevent movement of a switching arm 90, which will be described later.

Next, the tape cassette 3 loaded by the forward rotation drive of the first drive motor 1 as described above is
As shown in FIG. 6, the second drive motor 50 for running the magnetic tape housed in the magnetic tape 0 has a drive pulley 5 fixed to its rotary drive shaft 51.
Two transmission belts 54 and 55 are wound around the transmission belt 3, and the first and second flywheels 61 and 62 as well as the first intermediate pulley 63 are rotationally driven through the first transmission belt 45. The second intermediate pulley 100 is rotationally driven via the second transmission belt 55. Note that the second drive motor 50
is composed of a DC brushless motor or the like that can be driven in forward and reverse directions and whose rotational speed can be controlled.

Each of the flywheels 61 and 62 is provided with a capstan 64 and 65, respectively, and a support shaft 6 is provided at a position facing each of the capstans 64 and 65 with a magnetic tape interposed between them.
Each rotating arm 69, which is rotatable around 7, 68,
Pinch rollers 73 and 74 mounted on respective rotating shafts 71 and 72 provided at 70 are arranged. Each rotating arm on which the pinch rollers 73 and 74 are arranged is connected to a switching operation lever 90 via coil springs 75 and 76, respectively, and each operation protrusion 9 provided on the operation lever 90.
Contact pieces 69A and 70A that come into contact with 1 and 92 are provided. The switching operation lever 90 has an eccentric cam 96 in an engagement notch 95 extending from one end.
is engaged, and the rotation of the eccentric cam 96 causes movement in the direction of the arrow X in FIG.
Each pinch roller 73 is disposed on each rotating arm 69, 70, which is connected to the switching operation lever 90 via a coil spring 75, 76, respectively.
74 is selectively pressed against each of the corresponding capstans 64 and 65 depending on the direction of movement of the operating lever 90.

The first intermediate pulley 63 is for transmitting rotational driving force to each reel stand 78, 79, and is rotatably mounted on a rotating shaft 80 erected at a predetermined position of the mechanical chassis. A small gear 81 is integrally formed on the first intermediate pulley 63, and the rotation shaft 7 of each reel stand 78, 79 is connected to the first intermediate pulley 63.
Each gear 82, 83 provided in 8A, 79A
An idler gear 86 is meshed with the small gear 81 and is selectively meshed with intermediate gears 84 and 85 that are meshed with each other. The rotation shaft 87 of the idler gear 86 is the rotation shaft 87 of the first intermediate pulley 63.
The idler lever 88 is provided on an idler lever 88 that is rotatable around the center, and is rotationally displaced in accordance with the rotational direction of the first intermediate pulley 63.

Further, the second intermediate pulley 100 has an eccentric cam 9 that moves and operates the switching operation lever 90.
6, and is rotatably mounted on a rotating shaft 101 erected at a predetermined position of the mechanical chassis. The small gear 102 integrally provided on the second intermediate pulley 100 is
It meshes with a large gear 105A of a gear 105 rotatably mounted on a rotating shaft 104 provided on a pivot lever 103 that is rotatable about a rotating shaft 101 of the second intermediate pulley 100. The above gear 105
The two intermediate gears 10 are formed by integrally forming a large gear 105A and a small gear 105B, and mesh with the operating gear 97 on which the eccentric cam 96 is provided.
6 and 107, the small gear 105B is selectively meshed with the small gear 105B. Here, each of the intermediate gears 106, 107
are respectively formed with missing gears 106A and 107A, and the first intermediate gear 106 and the second intermediate gear 107 are always meshed with the operation gear 97, respectively.

In the embodiment configured as described above, when the second drive motor 50 is driven in normal rotation at a constant speed, the second drive motor 50 rotates normally at a constant speed.
The constant speed normal rotation driving force of the drive motor 50 is transmitted to each flywheel 61, 6 via the first transmission belt 54.
2 and the first intermediate pulley 63, and is also transmitted to the second intermediate pulley 100 via the second transmission belt 55, and the order in which the magnetic tape is run at a constant speed in the forward direction for recording and reproduction. The operation of the directional play mode is performed as follows.

That is, as shown in FIG. 7, each capstan 6 provided on each of the flywheels 61 and 62
4 and 65 are rotated at a constant speed in a direction (indicated by arrows D ₁ and D ₂ in FIG. 7) that causes the magnetic tape to run in the forward direction. Further, an idler lever 88 provided on the rotating shaft 80 of the first intermediate pulley 63 is connected to the first intermediate pulley 63.
Since the small gear 81 provided on the intermediate pulley 63 and the gear 86 provided on the idler lever 88 are in mesh with each other, the rotation of the first intermediate pulley 63 in the direction indicated by arrow _D3 in FIG. Due to the reaction caused by the driving force being transmitted to the gear 86 via the small gear 81, the gear 86 is moved to the first reel stand 78.
It rotates in the _four directions of arrow D in the figure, which meshes with the intermediate gear 84 on the side. Therefore, the first intermediate pulley 6
3 is transmitted to the first reel stand 78 via the intermediate gear 84, and the first reel stand 78 performs forward winding of the magnetic tape in the direction of arrow D _F in the figure. Further, a rotating lever 10 provided on the rotating shaft 101 of the second intermediate pulley 100
3, as shown in FIG. 8, the small gear 102 provided on the second intermediate pulley 100 and the gear 105 provided on the rotary lever 103 are meshed with each other, so that the second intermediate The rotational driving force of the pulley 100 in the direction of arrow _D5 in FIG.
Rotate in the direction of arrow D ₆ in Fig. 8. Therefore, the rotational driving force from the second intermediate pulley 100 is transmitted to the operation gear 97 via the first intermediate gear 106, and the first intermediate gear 1
The eccentric cam 96 is rotated by a predetermined angle until the missing tooth portion 106A of No. 06 and the gear 105 are almost in opposing positions. Therefore, the switching operation lever 90 is moved in the direction of the arrow X in FIG. 8 by the eccentric cam 96, and the coil spring 7 is attached to the switching operation lever 90.
The rotating arm 69 connected through 5 is indicated by the arrow
The first pinch roller 73 is rotated in the _D7 direction and is brought into pressure contact with the first capstan 64. On the other hand, the second
The pinch roller 73 is connected to the switching operation lever 90.
The rotating arm 70 is rotated in the direction of arrow _D8 by the operation protrusion 92, and the second capstan 65 is rotated.
It becomes a state separated from. At this time, a return force in the opposite direction to the X direction acts on the switching operation lever 90, and this return force causes the eccentric cam to maintain the operating gear even after the switching lever has been moved by the maximum stroke in the direction of the arrow X. Protrusion 97A formed on 97
The first intermediate gear 10 is rotated until it is stopped by a stopper 108A formed on the base plate 108.
Since the toothless portion 106A of No. 6 and the gear 105 face each other, the rotation of the gear 105 is not transmitted to the first intermediate gear 106.

Therefore, the upstream side of the magnetic tape is held between the first capstan 64 and the second pinch roller 73, and the magnetic tape is moved in the forward direction by the constant rotational driving force of the first capstan 64. It can be made to run at a constant speed.

Note that if the second drive motor 50 is rotated at a constant speed in the opposite direction, the flywheels 61, 6
2 is rotated in the opposite direction and the first pulley 63 is also rotated in the opposite direction, so the gear 86 meshes with the gear 85 and the second reel stand 79 rotates, contrary to the forward play mode described above. driven, while the second
Since the pulley 100 of is driven to rotate in the opposite direction,
The gear 105 meshes with the second intermediate gear 107 and the operation gear 97 is driven in the opposite direction, so that the switching operation lever 9
0 is moved in the direction shown in FIG. 6, and the second pinch roller 74 is pressed against the second capstan to achieve the reverse play mode.

Further, in this embodiment, by driving the second drive motor 50 to rotate at high speed, the fast forward operation mode and the rewind operation mode are performed.

That is, if the second drive motor 50 is driven in the normal direction, the magnetic tape is wound in the forward direction by the first reel stand as described above, so the second drive motor 50 is driven in the normal direction at high speed. By driving it, a fast forward operation mode can be performed. Similarly, by driving the second drive motor 50 in reverse at high speed, the second reel stand 79
The magnetic tape can be rewound at high speed in the opposite direction.

Here, a case will be described in which the above-mentioned fast forward or rewind mode is obtained from the play mode. First, drive the first drive motor to move the worm wheel 5.
The head board 23 is rotated 80 degrees to retreat, and the pinch roller, which is pressed against the capstan by the pinch roller shaft engagement groove 23A provided in the head board 23, is separated from the capstan.
By rotating the drive motor in the forward direction at high speed, the gear 86 is meshed with the intermediate gear 84 and the first gear 86 is engaged with the intermediate gear 84.
The reel stand 78 is driven to rotate at high speed to enter the fast-forward mode. On the other hand, by rotating the second drive motor in the opposite direction at high speed, the gear 86 is meshed with the intermediate gear 85, and the second reel stand 79 is driven to rotate at high speed, resulting in a rewind mode.

In these fast forward or rewind modes, the cam groove 40 formed in the head board 23 guides the retracting locking arm 42 of the head board to the ninth position.
The above-mentioned rotary lever 103 is rotated in the Y direction in the figure, and the locking portion 42A provided on the locking arm 42
When the locking protrusion 103A provided in The gear 105 is locked in the opposing position. Therefore, even after setting the fast forward or rewind mode, by canceling the fast forward or rewind mode, the play mode in the tape running direction before the fast forward or rewind mode is set can be quickly obtained.

That is, in this embodiment, the magnetic tape can be rapidly forwarded in the forward and reverse directions without the magnetic head 25 and the pinch rollers 73, 74 coming into sliding contact with the magnetic tape.

As is clear from the description of the embodiments described above, the present invention includes a drive motor that can be driven in forward and reverse directions, and a drive motor that is rotationally driven by the drive motor and in which first and second cams are formed. board and
The cassette holder is operated in conjunction with a first lever driven by the guidance of the first cam, and the cassette holder is operated in conjunction with a second lever driven by the guidance of the second cam. After the first lever is driven by the first cam to lower the cassette holder by the forward rotation of the drive motor, the second lever is moved by the second cam. The lever is driven to move the head board forward and the magnetic head is inserted into the tape cassette, and the drive motor is driven in reverse to drive the second lever by the second cam to move the head board back and insert the magnetic head into the tape cassette. After the head is retracted out of the tape cassette, the first lever is driven by the first cam to raise the cassette holder, so that one drive motor can move the tape cassette. It is possible to provide a cassette-type tape recorder with good operability that allows reliable loading and unloading operations.

[Brief explanation of the drawing]

1 to 9 show one embodiment of the present invention, FIG. 1 is a plan view showing the main part configuration of the loading operation drive system by the first drive motor in this embodiment, and FIG. 2 is the loading FIG. 3 is a perspective view of the main part showing the elevating mechanism of the cassette holder in the operation drive system; FIG. 3 is a plan view of the main part showing the ejecting mechanism of the tape cassette; FIG. FIG. 5 is a schematic diagram showing the operation mode of the worm wheel in the loading operation drive system, FIG. 6 is a plan view showing the main part configuration of the tape running drive system using the second drive motor in this embodiment, and FIG. 7 8 is a plan view of the main part showing the tape running mechanism using the drive motor, FIG. 8 is a plan view of the main part showing the switching operation mechanism of the pinch roller, and FIG. 9 shows the operating state in the fast forward and rewind operation modes. FIG. 1... Drive motor, 4... Worm gear, 5...
... Worm wheel (driving rotary plate), 7, 8...
Cam groove, 10... Holder operating lever, 11, 22
...Cam roller, 13...Cassette holder, 14
...Auxiliary arm, 15, 24...Coil spring, 1
6...Torque spring, 21...Head operation lever,
23...Head board, 25...Magnetic head, 30
...Tape cassette.

Claims (1)

[Scope of utility model registration request] a drive motor capable of forward and reverse rotation; a drive rotary plate rotationally driven by the drive motor and on which first and second cam grooves are formed;
a cassette holder that is operated in conjunction with a first lever that is driven by the guidance of the second cam; and a head board that is operated in conjunction with a second lever that is driven by the guidance of the second cam. The first cam is driven by the first cam by the forward rotation of the drive motor.
After driving the lever to lower the cassette holder, the second lever is driven by the second cam to advance the head board and insert the magnetic head into the tape cassette. The second lever is driven by the second cam by the reverse drive of the magnetic head tape cassette, and the head board is retracted out of the magnetic head tape cassette, and then the first lever is driven by the first cam. A cassette type tape recorder characterized in that the cassette holder is configured to be raised.