JPH0973687A - Magnetic tape recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the manufacturing cost of the device low and to eliminate its noise. SOLUTION: A planetary gear 49 is engaged with either a 1st gear 53 or a 2nd gear 54 in accordance with a rotating direction of a motor 56. Reproducing and reverse reproducing capstans are always rotated by rotating the motor, and either of take-up and suppy reel bases is selected and is driven to rotate. According to a turning position of the gear 53, an operation mode for selecting a rotating position of a magnetic head and its heightwise position, a reel base to be driven, a driving speed of the reel base and a pinch roller to be moved to its capstan, etc., is set up. By rotating the gear 54 by the planetary gear 49, the magnetic head and the pinch roller are moved into their setting positions. By rotating the motor 56 when a gear 60a to be rotationally driven by the planetary gear 49 is positioned in a toothless part of the gear 54, the capstans and either of the reel bases are driven to travel a magnetic tape in the reproducing or rewinding direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape recording / reproducing apparatus, and more particularly to reproducing, fast-forwarding, reverse reproducing,
The present invention relates to a magnetic tape recording / reproducing apparatus capable of performing mode switching such as rewinding and tape running with one motor as a drive source.

[0002]

2. Description of the Related Art Conventionally, in a recording / reproducing apparatus for a magnetic tape such as a compact cassette, a so-called tape recorder, reproduction,
One motor and one solenoid are used to perform mode switching such as fast-forwarding, reverse reproduction, rewinding, and tape running. Since such a tape recorder uses an expensive solenoid, the manufacturing cost is high, and the solenoid has a problem that the operation noise is large and noise is generated.

In order to solve the above problems, the fairness 7-92
The tape player proposed in Japanese Patent Publication No. 14 is provided with a drive gear integrally with a capstan rotated by a motor, and has a planetary gear that orbits around the drive gear according to the rotation direction of the drive gear while always meshing with the drive gear. It is located on the swing arm. The planetary gear meshes with one of the reel gears to drive the reel stand on the winding side or the supply side to rotate. The mode switching is performed by the planet gear rotating the mode switching gear in the middle of the orbit of the planet gear.

In the tape player of the first embodiment, the cam provided on the mode switching gear moves up and down the head base to which the magnetic head and the pinch roller are attached. And
The play mode (playback state) is set when the magnetic head contacts the magnetic tape and the pinch roller is pressed against the capstan, and the FF mode (fast-forward state is set when the magnetic head is separated from the magnetic tape and the pinch roller is separated from the capstan. ) Or REW (rewinding state). Further, the review mode is set when the magnetic head is in slight contact with the magnetic tape and the pinch roller is away from the capstan.
As the tape player of the second embodiment, a reproducing magnetic head and a reverse reproducing magnetic head are provided on the head base, the magnetic head is brought into contact with the magnetic tape instead of the review mode of the first embodiment, and the pinch roller is used. It is shown that the cap is pressed into contact with the capstan for reverse playback mode.

[0005]

[Problems to be Solved by the Invention]
The tape player of the first embodiment shown in Japanese Patent Publication No. 214 can perform the reproducing mode because it has only one magnetic head fixed to the head base, but cannot set the reverse reproducing mode. The tape player of the second embodiment is capable of a reproduction mode and a reverse reproduction mode, but has two magnetic heads fixed to the head base. In this case, a microcassette is used as the cassette half. The center of the exposed portion of the magnetic tape of the microcassette is held by the pinch rollers, and the magnetic heads can be brought into contact with the portions on both sides of the pinch roller. In the cassette half of the compact cassette, the pinch roller holding portions are arranged on both sides of the portion that comes into contact with the magnetic head, and it is difficult for the magnetic tape to come into contact with the two magnetic heads.

Therefore, in the method disclosed in Japanese Utility Model Publication No. 7-9214 for changing modes by changing the position of the head base, it is impossible to perform reproduction and reverse reproduction using the cassette half of the compact cassette. Further, since the transmission mechanism for transmitting the rotation from the motor to the reel base is not used, the rotation speed of the motor has to be changed between fast-forwarding and reproduction, and the motor drive circuit becomes expensive. .

The present invention has been made in view of the above points, and an object of the present invention is to reproduce a magnetic tape recording / reproducing apparatus using a cassette half of a compact cassette by using one motor as a drive source. It is an object of the present invention to provide a means for performing mode switching such as fast-forwarding, reverse reproduction, rewinding, and tape running. Another object of the present invention is to provide a magnetic tape recording / reproducing apparatus in which the above-mentioned mode switching and tape running can be performed only by rotating one motor forward and backward without setting at two rotation speeds.

[0008]

In the magnetic tape recording / reproducing apparatus of the present invention, the planetary gear that meshes with the sun gear to which the rotation of the motor is transmitted and can orbit the sun gear is the first gear or the first gear. A gear that transmits rotation to the gear and a second gear that has a toothless portion or a gear that engages with the second gear, and that transmits the rotation of the planetary gear or the planetary gear is the second gear. The rotation of the motor when it is located at the toothless portion of the gear drives the capstan and either one of the reel bases to drive the magnetic tape in the reproducing or rewinding direction. A magnetic head mounting plate slidably mounted on the chassis and urged by a spring is moved up and down by a head elevating plate via the spring, and either one of the pinch rollers is moved in the capstan direction and the magnetic head. A switching plate having a magnetic head rotatably mounted on a mounting plate and rotating by 180 ° is slidably mounted on the head mounting plate, and a cam for raising and lowering the head elevating plate is provided at the second position. Provided integrally with the gear of
The mode setting plate and the switching plate for switching the power switching mechanism for transmitting the rotation of the motor between one reel base and the other reel base and setting the position where the head mounting plate is driven are When the cam for driving the head elevating plate raises the head elevating plate and the toothless portion of the second gear corresponds to the planet gear or the gear to which the rotation of the planet gear is transmitted, A cam that moves a lever that locks a protrusion integrally provided on the second gear and blocks rotation of the second gear between a position that locks the protrusion and a position that does not lock the protrusion. Provided integrally with the gear.

In the above structure, the operation mode of the magnetic tape recording / reproducing apparatus is set by the rotation of the first gear.
That is, either one of the reel bases or the other reel base is selected as the reel base driven by the motor, and the position of the head mounting plate is set via the mode setting plate.
Further, the cam for moving the lever, which is integrally provided with the second gear, for locking the projection between the position for locking the projection and the position for not locking the projection receives the reaction force of the lever and moves the first gear. Hold at the mode setting position.

When the first gear is rotated and the lever is driven to release the locking of the protrusion of the second gear, the spring of the spring for urging the magnetic head mounting plate acts on the second gear by the cam. The rotation causes the magnetic head mounting plate to move, and the tooth portion of the second gear comes into a position to engage with the planet gear or the gear rotated by the planet gear.

After setting the operation mode in this way,
The reverse rotation of the motor causes the planet gears to orbit and engage the second gear. Then, as the second gear rotates, the head elevating plate ascends and the magnetic head mounting plate moves to the position set by the mode setting plate. Also,
One of the pinch rollers is moved in the capstan direction by the position of the switching plate set by the first gear, and the detection / recording portion of the magnetic head is in contact with the A-side track or B-side track of the magnetic tape. Come to When the second gear is rotationally driven by the planetary gear, the elastic force of the spring for urging the magnetic head mounting plate receives the torque in the planetary gear driving direction, but the lever driven by the first gear moves the first gear. Since the projection of the gear is locked, the toothless portion stops at the position corresponding to the planetary gear. In this state, the first gear and the second gear are not rotated by the motor, and the magnetic tape is run. Then, the magnetic tape recording / reproducing apparatus operates in the mode set by the first gear.

For example, in the play mode, the recording / reproducing portion of the magnetic head is in contact with the track on the surface A of the magnetic tape, and the pinch roller corresponding to the capstan for feeding the tape in the reproducing direction moves in the capstan direction. Has been made. The head mounting plate is largely moved in the direction of the magnetic tape, and the pinch roller is pressed against the capstan to bring the magnetic head into contact with the magnetic tape. The power switching mechanism is in a state of transmitting the rotation of the motor to one reel stand. In this state, when the motor rotates in the direction in which the planetary gear orbits in the second gear direction, the magnetic tape is sent by the capstan for sending in the reproducing direction and wound on one reel stand. Then, the track on the A side of the magnetic tape is recorded or reproduced.

In the reverse reproduction mode, the magnetic tape is sent by a capstan which is sent in the reverse reproduction direction and wound on the other reel stand. Then, the track on the B side of the magnetic tape is recorded or reproduced. That is, the pinch roller is pressed against the capstan sent in the reverse reproduction direction, the recording / reproducing portion of the magnetic head is in contact with the track on the B side of the magnetic tape, and the rotation of the motor is transmitted to the other reel stand.

In the fast-forward and rewind modes, the head mounting plate is moved to a position where the pinch roller does not contact the capstan. In this case, if a speed change mechanism is provided, the tape can be fed or rewound at high speed with the number of rotations of the motor being the same as in the reproducing state.

The mode setting plate for switching the power switching mechanism for transmitting the rotation of the motor between one reel base and the other reel base and for setting the position at which the head mounting plate is driven is the first It can be driven by a cam provided with a gear, or can be driven by engagement of a gear having a toothless portion provided integrally with the first gear with a rack and elastic force of a spring.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a magnetic tape recording / reproducing apparatus to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a perspective view showing the appearance of a magnetic tape recording / reproducing apparatus. 2 and 3 are exploded perspective views seen from the front side of the chassis body 4, and FIGS. 4 and 5 are exploded perspective views seen from the back side of the chassis body 4. The connection relationships are shown in lowercase letters throughout FIGS. The rotary lids 2 and 3 attached to the case body 1 shown in FIG. 1 are rotatable in the directions B and C shown in the figure. The rotary lids 2 and 3 are integrally provided with cassette holders 2a and 3a. However,
The cassette holder 3a is not shown. Compact cassette halves A (hereinafter referred to as cassette halves) are inserted in the cassette holders 2a and 3a in the direction of arrow D.

The cassette A inserted into the rotary lid 2 is held by the holder 2a, and the rotary lid 2 is rotated in the direction of arrow B to be mounted on the chassis body 4 shown in FIG. Although the recording / reproducing unit for one cassette is shown in FIGS.
There are pieces. The mounting position of the cassette half is the reference pin 6 standing on the chassis body 4 and the pin 7a of the guide 7.
And the guides 8 and 9 are positioned by the notches. Then, the cassette is held at that position by the elastic force of the leaf spring 5.

The capstans 10 and 11 shown in FIG. 4 are rotatably supported by a boss provided on the chassis body 4. The capstans 10 and 11 are press-fitted into the flywheels 12 and 13, respectively.
Poly sliders 20 and 2 are provided between 2 and 13 and the boss, respectively.
0 is interposed. The motor 56 shown in FIG. 5 is fastened to the chassis body 4 via the motor holders 51, 51 shown in FIG. A rubber belt 69 is stretched between the motor pulley 45 fixed to the rotating shaft of the motor 56 and the flywheels 12 and 13, and the capstans 10 and 11 are in opposite directions when the motor 56 is rotating. Is driven to rotate.

The pinch roller holders 65, 65 shown in FIGS. 2 and 3 are rotatably supported by shafts erected on the surface of the chassis body 4, and the pinch rollers 14, 14 are respectively supported by shafts 62, 62. It is rotatably supported. The pinch roller holders 65, 65 are biased by the torsion coil springs 64, 64. As will be described later, either the pinch roller 14 is pressed against the capstan 10 or 11 in the reproduction mode or the reverse reproduction mode.

The reel stands 16, 16 shown in FIGS. 2 and 3.
Is for winding the magnetic tape, and is supported by the reel gear 18 via compression coil springs 17 in a state where the reel gear 18 is not rotated and is locked by the reel bush 15. The reel gears 18, 18 are rotatably supported by shafts erected on the chassis body 4 via reflection seals 19, 19 and polysliders 20, 20, respectively. As will be described later, one of the reel bases 16 is connected to the motor 56.
Is driven to rotate and the magnetic tape is wound into the cassette half.

The magnetic head 21 shown in FIG. 3 is attached to a head base 23 via a rotary base 22 so as to be rotatable 180 ° about a vertical axis. The head base 23 is fastened to a magnetic head mounting plate 28 that is slidably supported on the chassis body 4 in the vertical direction (F direction in the drawing). The head lifting plate 29, which is supported on the chassis body 4 so as to be slidable in the vertical direction, pulls the head 30.
The magnetic head mounting plate 28 is moved up and down via. That is, the magnetic head mounting plate 28 is biased downward by the torsion coil spring 67, but is pulled up by the tension coil spring 30 having a stronger elasticity than the coil spring 67. The rising position of the magnetic head mounting plate 28 is the magnetic head mounting plate 2
8 and the hole 58a of the mode setting plate 58
It is regulated by the engagement with. The mode setting plate 58 is supported by the chassis body 4 so as to be slidable in the horizontal direction, and its horizontal position is set by the first gear 53 shown in FIG. 5, as will be described later.

A gear 24 is fixed to a rotary shaft of a rotary base 22 for holding the magnetic head 21, and the gear 24 meshes with a gear 26 with a lever rotatably supported by the head base 23. The lever-equipped gear 26 is biased by a torsion coil spring 25. The recording detection unit and the writing unit of the magnetic head 21 are rotated by 180 °, and
It comes into contact with the surface track or the B surface track.

The switching plate 27 is supported by a magnetic head mounting plate 28 so as to be movable in the horizontal direction (E direction in the drawing), and is biased to the left by a tension coil spring 63. The protrusion 27d of the switching plate 27 contacts the lever of the lever-equipped gear 26 to rotate the magnetic head 21. Also, the switching plate 27
The cam grooves 27a and 27b of the pinch roller holder 6
Rotate 5, 65. That is, one ends of the torsion coil springs 64, 64 that bias the pinch roller holder 65 engage with the cam grooves 27a and 27b, respectively. When the switching plate 27 moves to the left in FIG. 3, the right pinch roller holder 65 is rotated in the direction of the capstan 11 shown in FIG. 4, and when the switching plate 27 moves to the right, the left pinch roller holder 65 is moved. 65 is rotated in the capstan 10 direction. The horizontal position of the switching plate 27 is set by the first gear 53 as described later.

A first gear 53 shown in FIG. 5 is rotatably supported on a shaft 4a provided upright on the rear surface of the chassis 4 shown in FIG. Teeth 53a are cut on the outer circumference of the first gear 53, and a shaft 53d is provided upright on the side surface. A cam 53c is integrally provided on the side surface of the first gear 53 on the opposite side of the shaft 53d, and a disc 53b is fixed to the outside thereof.
The tip end 55a of a lever 55, which is supported by the chassis body 4 so as to be vertically movable and is urged downward by a tension coil spring 68, slides on the outer periphery of the disc 53b. The first gear 53 is shown in detail in FIG. Symbols such as FWD FF shown in the figure indicate the setting mode when the corresponding depression of the disk 53b engages with the tip 55a of the lever 55. Lever 5
5 slides up and down on the disk 53b to move up and down to operate the switch 66. The switch 66 counts the upper and lower sides of the lever 55 to detect the set mode. The first gear 53
The home position of is detected by the lowering after the lever 55 is engaged with the long recess 53e and is at the lower position for a long time.

The slider 61 is supported by shafts 4f and 4f provided upright on the chassis body 4 so as to be slidable in the horizontal direction (H direction in FIG. 5). The tip 61b of the slider 61, which is in contact with the upright projection 27c and is urged to the right in FIG. 5 by the tension coil spring 63, is in pressure contact with the cam 53c, and the rotational position of the first gear 53 is increased. Thus, the positions of the slider 61 and the switching plate 27 are determined, and the magnetic head 21 is set in the inverted or non-inverted state.

The slider 59 is supported on the chassis body 4 so as to be slidable in the horizontal direction, and has a vertical groove 59b provided therein.
Is engaged with the shaft 53d of the first gear 53 and is driven in the left-right direction by the rotation of the first gear 53. The shafts 59c, 59c provided upright on the slider 59 are provided with holes 58 in the mode setting plate 58.
The slider 59 drives the mode setting plate 58 in the same direction by engaging with b and 58b. A cam 59a provided on the slider 59 operates a speed change mechanism described later.

The second gear 54 has a tooth 54a having a toothless portion provided on the outer periphery thereof, and is rotatably supported by a shaft 4b provided upright on the chassis body 4. A disc 54c having a cam 54b and a protrusion 54d is fixed to the second gear 54. The cam 54b is a bent piece 2 of the head lifting plate 29.
It abuts against 9a and raises / lowers the head lifting plate 29.
The protrusion 54d is locked to the left end 55b of the lever 55 when the lever 55 is at the lower position.

A gear 60a capable of meshing with the teeth 54a of the second gear 54 is integrated with the pulley 60, and is rotatably supported by a shaft 4c provided upright on the chassis body 4.
The gear 52 is integrated with the pulley 73, and is rotatably supported by a shaft 4d provided upright on the chassis body 4. A rubber belt 72 is stretched between the pulley 60 and the pulley 73.

The gear 52 and the first gear 53 are the planetary gears 4
9 can be meshed. The planet gear 49 is rotatably supported by a shaft erected on the swing arm 50,
Shaft 4 erected on chassis body 4 together with swing arm 50
It is always meshed with the sun gear 48 rotatably supported by 7. A rubber belt 70 is hung between the pulley 46 integrated with the sun gear 48 and the motor pulley 45, and the sun gear 48 is rotationally driven by the motor 56.

The clutch arm 33 shown in FIG. 4 is rotatably supported by a shaft 4g provided upright on the chassis body 4,
The rewinding gear 32 is rotatably supported via a shaft 33a, and the drive gear 31 is rotatably supported via a clutch shaft 35 shown in FIG. The clutch shaft 35 is integrated with the drive gear 31, and the clutch arm 3
3 is supported so as to be movable in the axial direction. The drive gear 31 and the rewinding gear 32 are always in mesh with each other.

A torsion coil spring 34 is attached to the clutch arm 33, and when one end of the torsion coil spring 34 is pushed upward, the torsion arm spring 34 is tilted in either direction from the upright position to drive the drive gear 31 or the rewinding gear. 32 is meshed with one of the reel gears 18. The tilting direction of the clutch arm 33 is determined by the position of the slider 57 shown in FIG. The shafts 57c and 57c provided upright on the slider 57 are provided with vertical grooves 58c and 5c of the mode setting plate 58.
Shaft 57 that is engaged with 8c and is erected on slider 57.
d and 57d are horizontal grooves 29b and 29b of the head lifting plate 29.
That is, the horizontal position of the slider 57 is determined by the mode setting plate 58, and when the slider 57 is lifted by the head elevating plate 29, the bending piece 5 is moved according to the horizontal position.
Either 7a or 57b pushes either end of the torsion coil spring 34 upward.

A felt base 39 is press-fitted onto the clutch shaft 35 that transmits the rotation to the drive gear 31. The reproduction gear 37 and the felt 38 arranged on one side of the felt base 39 are urged in the direction of the felt base 39 by the compression coil spring 36, and the reproduction gear 37, the felt 38, and the felt base 39 are pressed to contact each other. Rotation is transmitted from the reproduction gear 37 to the felt base 39 by friction between the two.

The felt 38 and the F / R gear (fast forward / rewind gear) arranged on the other side of the felt base 39 are urged toward the felt base 39 by the compression coil spring 41, and the F / R gear 40, When the felt 38 and the felt base 39 are brought into pressure contact with each other, the friction between them causes the F / R gear 40 to transmit the rotation to the felt base 39. The reel bush 42 fixed to the clutch shaft 35 locks the compression coil spring 41.

The gear 43, which is integrated with the reel 44, is rotatably supported by a shaft 4g provided upright on the chassis body 4. A rubber belt 71 is hung between the reel 44 and the motor pulley 45, and the rotation of the motor 56 is constantly transmitted to the gear 43. Reproduction gear 37 and F / R gear 40
Is moved in the axial direction together with the clutch shaft 35, as shown in FIG.
The reproduction gear 37 shown in FIG. 7 meshes with the small gear of the gear 43 or the large gear of the F / R gear 40 gear 43 shown in FIG. 7B. In the state of FIG. 7A, the reel stand 1
6 is driven at a low speed to enter the reproduction state or the reverse reproduction state. In the state of FIG. 7B, the reel stand 16 is driven at a high speed to be in the fast-forward state or the rewind state. The reproduction gear 37 and the F / R gear 40 are moved by the cam 59a of the slider 59.

In the above structure, by rotating the motor 56 in the counterclockwise direction when viewed from the axial direction (hereinafter referred to as forward rotation. The rotation in the opposite direction is referred to as reverse rotation), the swing arm 50 is moved from the rear surface of the chassis by frictional force. When viewed, the planetary gear 49 rotates clockwise and meshes with the first gear 53. That is, the operation mode can be set by the normal rotation of the motor 56. Lever 55 when the operation mode is set
Is locked in the recess of the disk 53b and is in the lower position to stabilize the rotating position of the first gear 53.

When the motor 56 is rotated in the reverse direction after setting the operation mode, the swing arm 50 is rotated counterclockwise as viewed from the rear surface of the chassis by the frictional force, and the planetary gear 49 is rotated by the gear 5.
Mesh with 2. That is, the reverse rotation of the motor causes the gear 60a to
Is driven to rotate. The gear 60a rotates the second gear 54 in the clockwise direction when viewed from the rear surface of the chassis. The rotation of the gear 54 causes the cam 54b to raise the head elevating plate 29. If the head lifting plate 29 is beyond the maximum raised position, the second gear 54
Receives a torque in the clockwise direction by the elasticity of the torsion coil spring and rotates further in the clockwise direction.
Is in the lowered position, the protrusion 54d of the disk 54c is locked to the tip 55b of the lever 55, and the second gear 54 stops. At this time, the gear 60a is located at the toothless portion of the second gear 54, and the rotation of the motor is not transmitted to the second gear 54.
In this state, the operation of each mode such as reproduction is performed.

When the motor 56 is rotated in the normal direction, the mode can be set again, but at this time, the lever 55 is raised and the locking of the projection 54d of the disk 54c is released.
The gear 54 rotates to come into mesh with the gear 60a again.

When the position recess of the FWD PLAY mode shown in FIG. 6 engages with the lever 55, that is, the FWD
In the PLAY mode, the reel stand 16 on the right side is rotated at a low speed when viewed from the front of the chassis 4, and the pinch roller 14 on the right side is rotated.
Is pressed against the capstan 10. The magnetic head 2
1 is rotated to a position for reproducing the A-side track. In this way, the side A of the magnetic tape is reproduced. FWD P
The state of the LAY mode is shown in FIGS. 8 (a) and 8 (b).

In the FWD FF mode, the reel stand 16 on the right side is rotated at a high speed, and the pinch roller 14 is separated from the capstan. Further, the magnetic head 21 rotates to a position for reproducing the A-side track and is in light contact with the magnetic tape. In this way, the side A of the magnetic tape is fast-forwarded or searched. The state of FWD FF mode is shown in FIG.
(A) and (b).

In the FWD REW mode, the reel stand 16 on the left side is rotated at a high speed, and the pinch roller 14 is separated from the capstan. Further, the magnetic head 21 rotates to a position for reproducing the A-side track and is in light contact with the magnetic tape. In this way, the side A of the magnetic tape is rewound or searched. The state of the FWD REW mode is shown in FIGS. 10 (a) and 10 (b).

Chassis 4 in REV PLAY mode
As seen from the table, the left reel stand 16 is rotated at a low speed, and the left pinch roller 14 is pressed against the capstan 11. Further, the magnetic head 21 is rotated to a position for reproducing the B-side track. In this way, the B side of the magnetic tape is reproduced. Fig. 11 shows the status of REW PLAY mode.
(A) and (b).

In the REV FF mode, the left reel stand 16 is rotated at high speed, and the pinch roller 14 is separated from the capstan. Further, the magnetic head 21 rotates to a position for reproducing the B-side track and is in light contact with the magnetic tape. In this way, the side B of the magnetic tape is fast-forwarded or searched. Figure 1 shows the state of REW FF mode
2 (a) and (b).

In the REV REW mode, the reel stand 16 on the right side is rotated at a high speed, and the pinch roller 14 is separated from the capstan. Further, the magnetic head 21 rotates to a position for reproducing the B-side track and is in light contact with the magnetic tape. In this way, the B side of the magnetic tape is rewound or searched. The state of the REW REW mode is shown in FIGS. 13 (a) and 13 (b).

FIG. 14 shows a modification of the above embodiment. In this example, the teeth 53a of the first gear 53 in the above embodiment are replaced with the gear 101a and the toothless gear 101b, and the slider 59 is replaced with the rack 102 supported by the chassis body 4 so as to be slidable in the horizontal direction. ing. The gear 10a meshes with the planet gear 49 in the above embodiment. The rack 102 can mesh with the toothless gear 101b, and the tension coil spring 1
It is biased to the left at 03. Axis 10 of rack 102
2c and 102c are engaged with the holes 58b and 58b of the mode setting plate 58 in the above embodiment. Cam 1 on the rack 102
02a operates the speed change mechanism of the above-mentioned embodiment. The switch 104 is operated by the bent piece 102b of the rack 102. The rack 102 is stopped by a stopper (not shown) at a position where the switch 104 is operated. The slider 61 similar to the above-mentioned embodiment operates the switch 105. The other structure is the same as that of the above embodiment. Gear 101a
Has two missing tooth sections as shown in FIG. Gear 1
The position corresponding to each mode of 01a shown in the figure is the center of meshing with the rack 102 in that mode.

In this example, the rack 102 has the toothless gear 10
When the mesh with 1b is disengaged, the tension coil spring 103
The elastic force of moves to the left end position and becomes the initial position. Further, the rack 102 is sent by the toothless gear 101b for all strokes required for mode setting. The toothless gear 101
The rack 102 reciprocates twice during one rotation of b. In each mode in which the cassette half is processed, the same operation is repeated twice if the orientation of the magnetic head is ignored. Therefore, the toothless gear 1 integrated with the cam 53c for designating the direction of the magnetic head 1
All modes can be designated during one rotation of 01b. The switch 105 detects the orientation of the magnetic head. Further, both the switch 104 and the switch 105 are turned on, so that the initial position of the tooth-chipped gear 101b is detected.

[0046]

According to the magnetic tape recording / reproducing apparatus of the present invention, in a magnetic tape recording / reproducing apparatus using a cassette half of a compact cassette, reproduction and fast-forwarding are performed by using one motor as a drive source without using a solenoid.
Since mode switching such as reverse reproduction and rewinding and tape running are performed, no noise is generated and the manufacturing cost is reduced. Also, since the motor can be fast-forwarded and reproduced at a constant speed, the motor drive circuit becomes simple.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic tape recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is an exploded perspective view showing a part of the magnetic tape recording / reproducing apparatus.

FIG. 3 is an exploded perspective view showing a portion of the magnetic tape recording / reproducing apparatus.

FIG. 4 is an exploded perspective view showing a part of the magnetic tape recording / reproducing apparatus.

FIG. 5 is an exploded perspective view showing a part of the magnetic tape recording / reproducing apparatus.

FIG. 6 is a front view showing components of the magnetic tape recording / reproducing apparatus.

FIG. 7 is a partial plan view showing the operation of the magnetic tape recording / reproducing apparatus.

FIG. 8A is a FW of the magnetic tape recording / reproducing apparatus.
FIG. 8B is a front view of the D PLAY mode viewed from the front side of the chassis as seen through, and FIG. 8B is a rear view of the same state of the magnetic tape recording and reproducing apparatus viewed from the back side of the chassis as viewed through each part. It is a figure.

FIG. 9A is a FW of the magnetic tape recording / reproducing apparatus.
FIG. 9B is a front view of the DFF mode in which the parts are seen through from the front side of the chassis, and FIG. 9B is a rear view of the same state of the magnetic tape recording and reproducing apparatus seen through the parts from the back side of the chassis. It is a figure.

FIG. 10 (a) is a front view of the same magnetic tape recording / reproducing apparatus in a FWD REW mode as seen through each component from the chassis front side, and FIG. 10 (b) is the same magnetic tape recording / reproducing apparatus. FIG. 3 is a rear view of the same state as seen through each component from the back side of the chassis.

FIG. 11A is a front view of the same magnetic tape recording / reproducing apparatus in a REV PLAY mode as seen through each component from the chassis front side, and FIG. 11B is the same magnetic tape recording / reproducing apparatus. FIG. 3 is a rear view of the same state as seen through each component from the back side of the chassis.

FIG. 12 (a) is a front view of a state of the REV FF mode of the magnetic tape recording / reproducing apparatus seen through each component from the chassis surface side, and FIG. 12 (b) is the magnetic tape recording / reproducing apparatus. FIG. 3 is a rear view of the same state as seen through each component from the back side of the chassis.

FIG. 13 (a) is a front view of the magnetic tape recording / reproducing apparatus in a REV REW mode, as seen through each component from the chassis front side, and FIG. 13 (b) is the magnetic tape recording / reproducing apparatus. FIG. 3 is a rear view of the same state as seen through each component from the back side of the chassis.

FIG. 14 is an exploded perspective view showing a portion of a modified example of the magnetic tape recording / reproducing apparatus.

FIG. 15 is a front view showing components of the modified example.

[Explanation of symbols]

1 Case Body 2 Rotating Lid 2a Cassette Holder 3 Rotating Lid 3a Cassette Holder 4 Chassis Body 4a, 4b, 4c, 4d, 4e, 4
f, 4g shaft 5 leaf spring 6 reference pin 7 guide, 7a pin 8,9 guide 10, 11 capstan 12, 13 flywheel 14 pinch roller 15 reel bush 16 reel stand 17 compression coil spring 18 reel gear 19 reflection seal 20 polyslider 21 Magnetic head 22 Rotation table 23 Head table 24 Gear 25 Torsion coil spring 26 Gear with lever 27 Switching plate, 27a, 27b Cam groove, 27c
Shaft, 27d protrusion 28 magnetic head mounting plate, 28a shaft 29 head lifting plate, 29a bent piece, 29b horizontal groove 30 tension coil spring 31 drive gear 32 rewinding gear 33 clutch arm, 33a shaft 34 torsion coil spring 35 clutch shaft 36 compression coil spring 37 Playback Gear 38 Felt 39 Felt Table 40 F / R Gear 41 Compression Coil Spring 42 Reel Bushing 43 Gear 44 Reel 45 Motor Pulley 46 Pulley 47 Shaft 48 Sun Gear 49 Planetary Gear 50 Swing Arm 51 Motor Holder 52 Gear 53 First Gear, 53a teeth, 53b disk, 53c
Cam, 53d shaft 54 second gear, 54a teeth, 54b cam, 54c
Disk, 54d protrusion 55 lever, 55a, 55b tip 56 motor 57 slider, 57a, 57b bent piece, 57c,
57d axis 58 mode setting plate, 58a, 58b hole, 58c vertical groove 59 slider, 59a cam, 59b vertical groove 60 pulley, 60a gear 61 slider 62 axis 63 tension coil spring 64 torsion coil spring 65 pinch roller holder 66 switch 67 torsion coil spring 68 tension Coil spring 69, 70, 71, 72 Rubber belt 73 Pulley

Claims (3)

[Claims] 1. A planetary gear that meshes with a sun gear to which rotation of a motor is transmitted, and that can rotate around a sun gear. A first gear or a gear that transmits rotation to the first gear, and a toothless portion. The motor when engaged with either the second gear or the gear engaged with the second gear, and the planet gear or the gear to which the rotation of the planet gear is transmitted is located in the toothless portion of the second gear. Rotation drives the capstan and either reel stand to drive the magnetic tape in the play or rewind direction, and the magnetic head mounting plate slidably mounted on the chassis and urged by the spring through the spring. A cam for moving one of the pinch rollers in the capstan direction and a magnetic head rotatably attached to the magnetic head attachment plate.
A switching plate having an engaging portion for rotating by 0 ° is slidably attached to the head mounting plate, and a cam for raising and lowering the head elevating plate is integrally provided on the second gear to rotate the motor in one direction. The power switch mechanism for switching and transmitting between the reel stand and the other reel stand, and the mode setting plate for setting the position where the head mounting plate is driven and the switching plate are driven by the first gear. A cam for driving the head lifting plate raises the head lifting plate and a toothless portion of the second gear corresponds to the planetary gear or a gear to which rotation of the planetary gear is transmitted. A cam is provided integrally with the first gear for moving a lever that locks the protrusion provided integrally and prevents rotation of the second gear between a position where the protrusion is locked and a position where the protrusion is not locked. Magnetic te Flop recording and reproducing apparatus. 2. A magnetic tape recording / reproducing apparatus according to claim 1, wherein a speed change mechanism for speed-changing and transmitting the rotation of the motor to one of the reel stands is driven by the first gear. 3. A mode setting plate for switching a power switching mechanism for transmitting the rotation of the motor by switching between one reel base and the other reel base and setting a position at which the head mounting plate is driven. 3. The magnetic tape recording / reproducing apparatus according to claim 1, wherein the magnetic tape recording / reproducing apparatus is reciprocally driven by engagement between a gear having a toothless portion integrally formed with the gear 1 and a rack and elastic force of a spring.