JPS60209956A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the load of a motor control circuit and also to improve the reliability with loading and unloading actions, by setting the same revolving direction of the motor in both loading and unloading modes. CONSTITUTION:In a loading mode a gear 203 is rotated clockwise by a motor and a lever 204 is rotated counterclockwise by frictional connection with the gear 203. Then the gear 203 engages a gear 101 of a loading mechanism part 10 to drive directively the gear 101. In an unloading mode the gear 203 is also driven clockwise by the motor and the lever 204 is rotated counterclockwise. A lever 501 is rotated clockwise to set the record and reproduction modes prior to above-mentioned operations of the gear 203 and the lever 204. Then a gear 500 engages the gear 101. Therefore the gear 203 engages the gear 500 and the revolving torque of the gear 203 is transmitted to the gear 101 via the gear 500. Then the revolving direction of the gear 101 is reversed to the loading mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic recording and reproducing apparatus such as a video tape recorder (hereinafter referred to as VTR).

[Technical background of the invention]

Looking at the motors required for various operations in a VTR, for example, there are motors that drive the reel, motors that drive the loader mechanism that winds the magnetic tape around a cylinder equipped with a rotating head, and motors that remove the tape from the cylinder. The motor that drives the unloading mechanism that removes the cassette and stores it in the cassette, recording, playback mode, and stop mode.

Many motors are required, including a motor that drives the mode switching mechanism for setting the fast forward, two rewind, and eject modes.

By the way, in recent years, in order to make devices smaller and lighter,
There is a growing trend to use a single motor as a drive source for multiple mechanisms.

For example, a device has already been developed in which the above-mentioned loading mechanism section and unloading mechanism section (hereinafter collectively referred to as tape loading mechanism section) are driven by one motor. Furthermore, recently, devices have been developed in which the motor of the tape loading mechanism drives other mechanisms, such as the mode switching mechanism described above, and devices have been made much smaller and lighter.

[Problems with background technology]

However, in the case of conventional devices in which the tape loading mechanism and other mechanisms are driven by one motor, the rotation direction of the motor is reversed during loading and unloading, so the drive of the other mechanisms Considering the relationship between the two, although it was possible to reduce the weight of the device, it was difficult to control the motor and was disadvantageous in terms of electrical aspects.

[Purpose of the invention]

This invention was made in order to deal with the above-mentioned situation, and by making it possible to make the rotational direction of the motor the same during loading and unloading, it is possible to reduce the burden on the motor control circuit. Of course, the object is to provide a magnetic recording/reproducing device that can improve the reliability of loading and unloading operations.

[Summary of the invention]

For example, if the present invention is explained using the embodiment shown in FIGS. 2 to 4, a lever 501 that selectively engages a gear SOO with a gear 101, and a gear 2030 rotated by a motor depending on the rotation direction. A lever 204 that is driven in the opposite direction is provided, and when the gear 101 is rotated by the gear 203 via the gear SOO, the lever 204 is brought into contact with the Leno Z-501 as shown in FIG. By doing so, the biasing force of the lever 501 can be offset by the biasing force of the lever 204.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, in order to make this invention easier to understand, FIG. I will explain using Here, the VTR shown in FIG. 1 has a configuration in which the motor that drives the tape loading mechanism is also used, for example, as the motor of the mode switching mechanism.

In addition, in FIG. 1, in order to focus on showing the positional relationship of each component on a plane, depictions showing the three-dimensional positional relationship are intentionally omitted for convenience.

In FIG. 1, A is a tape loading mechanism section, and for convenience, only a gear section IA that receives rotational torque from a motor (not shown) to drive the mechanism section main body is shown.

Reference numeral B designates a driving portion that receives the rotational torque of the motor (not shown) through a belt C and drives the gear portion IA.

D is a loading/unloading switching unit for realizing loading and unloading by rotating the motor (not shown) in the same direction when the driving unit B drives the gear unit IA.

E is a mode switching mechanism section, and for convenience, shows a gear section IE that receives the rotational torque of the motor, and a cam gear 2E that receives the rotational torque of this gear section IE and drives the mechanism section main body.

The driving part B is a gear B2 rotatably supported by a lever Bl.
has. In this case, the gear B2 and the lever B1 are frictionally engaged, and the lever B1 can selectively rotate clockwise or counterclockwise depending on the rotational direction of the gear B2. The loading/unloading switching section has a gear D2 rotatably supported by the lever Dl.

This gear D2 meshes with the gear A1 of the tape loading mechanism section A when the lever D1 rotates clockwise, and is disengaged when the lever D1 rotates counterclockwise.

The illustrated state shows an unloading state.

In this case, the lever D1 rotates clockwise and the gear D2 meshes with the gear A1.

Further, the gear B2 rotates clockwise, the lever Bl rotates counterclockwise due to the biasing force generated by the frictional engagement with the gear B2, and the gear B2 meshes with the gear D2. This results in
Gear AI is rotated clockwise by gear B2 via gear D2.

On the other hand, during loading, although the rotational direction of gear B2 does not change, the lever Dl rotates counterclockwise and gear D2 moves away from gear AI, so gear A1 is directly rotationally driven by gear B.

Therefore, gear A! is rotated in the opposite direction to that during unloading.

Then rotate A-Dl clockwise to change gear D2 to gear A,
To engage and set the unloading state,
This is done when loading is complete and recording and playback modes are set. That is, when loading is completed, gear B2 is now rotationally driven in the counterclockwise direction. As a result, the lever B1 rotates clockwise, and the gear B2 meshes with the gear IE of the mode switching mechanism E. As a result, the cam gear 2E rotates, and the mode switching mechanism releases the reel brake, sets the tape tension, and presses the capstan to set the recording or reproducing mode. When , cam gear 2E is loading/
Slide the slider D3 of the unloading switching section in the direction of the arrow x1 shown in the figure. Accordingly, a cam roller D is attached to the cam D4 of the slider D3.

The lever D6, which is connected to the lever D6, rotates counterclockwise, and the lever D1 rotates clockwise. In addition to this, gear D2
meshes with gear A1, and the unloading state is set.

On the other hand, setting the loading state is performed when unloading is completed and eject mode is set. That is, when unloading is completed, the lever B1 rotates clockwise again, and the gear B2 moves to the gear part I.
E and rotationally drives the cam gear 2E. Accordingly, the mode switching mechanism section E releases the reel brake, unlocks the cassette holder (not shown), and sets the eject mode in which the cassette can be taken out. At this time, the cam gear 2E is connected to the slider D3.
slide in the direction of arrow x2 shown in the figure. As a result, lever D6 rotates clockwise, lever D1 rotates counterclockwise, and gear D2 is separated from gear A.

By rotating the gear B2 clockwise, the gear B2 can mesh with the gear Al, and loading can be set.

Buto trigram force Am space 2 W! M l-ME f
h1. , Japan E C14h A unidirectional rotary cam that is driven to rotate in the same direction in all modes: recording, playback mode, and eject mode, and can switch all modes by rotating in one direction. It's a gear.

As explained above, the configuration shown in FIG. 1 can realize loading and unloading by rotating the motor in one direction, thereby reducing the burden on the motor control circuit.

However, in the case of the above configuration, the following problem occurs during unloading.

That is, during unloading, as shown in FIG. 1, the rotational torque of the motor changes from gear Bx to gear D2 to gear A.
It is transmitted to gear A1 in the order of l. At this time, a biting force Pl is generated in the gear B2 against the gear D2, and on the other hand, an escape force against the rotation post Ax is generated in the gear D2, and the force P2 shown in the figure acts. . Therefore, if this continues, the lever D1 will rotate counterclockwise and the gear A will rotate.
1 and gear D2 become disengaged.

In order to prevent this, the lever D6 holds the rotation post D7 of the gear D2, and the force P2 is received as a force P3 by the cam D4 of the slide/D3 via the lever D6.

However, due to the lever ratio between the point of application of the force P2 and the point of application of the force P3, the force relationship becomes P 2 < P s. As a result, the mounting accuracy of the slider D3 to the chassis F is poor, and if there is rattling or distortion, when the load on the gear A1 increases and the force P2 becomes large, the slider D3 will not be able to absorb the force P3. There are cases where the lever D rotates counterclockwise and unloading is not performed.

This invention not only makes it possible to realize loading and unloading by rotating the motor in the same direction, but also eliminates the above-mentioned problem in which the operating performance is significantly deteriorated due to the force generated by the meshing of gears. This is how it was done.

FIG. 2 is a plan view showing the main parts of one embodiment.

In addition, in this Figure 2, as in the previous Figure 1, emphasis is placed on showing two-dimensional positional relationships, and depictions showing three-dimensional positional relationships are avoided; this will be discussed later in Chapter 6. The explanation will be made for reference with reference to FIG. 7 and FIG.

FIG. 2 shows the loading state.

In the figure, reference numeral 100 indicates a loading mechanism section, 100 indicates a gear section thereof, and 120 indicates a loading section. Gear part 11
0, the gear 1o1 and the bevel 102 are formed coaxially and integrally, and among them, the bevel gear 10
2 is meshed with the bevel gear 103. A worm gear 104 integrally formed with this bevel gear 103 meshes with a worm wheel 105 ◎Worm wheel 10
A gear 106, which is coaxial with the gear 5, meshes with the gear 107. The gear 10B is coaxially formed integrally with the gear 107.

The illustrated tape loading mechanism is of a type having two loading rings, and only the upper loading ring 120 is shown in the figure. In this case, the gear 106 meshes with the lower loading ring to drive it to rotate, and the gear 108 meshes with the upper loading ring 120 to drive it to rotate.

20 is the driving part, 201 is its pulley, 202.2
03 is a gear, and 204 is a lever that supports the gear 203. The gear 202 is formed coaxially with the pulley 201 and has a single weight, and uses the post 205 as its pivot point. Further, this gear 202 is connected to a lever 20 that is meshed with a gear 204.
4 uses the post 205 as a rotation fulcrum, and its rotation range is defined by the collision between two protrusions 206 and 207 formed on the outer peripheral edge and the post 208 attached to the main base. Further, the lever 204 is frictionally engaged with the gear 203, and the direction of rotation can be switched depending on the rotation direction of the gear 203.

40 is a mode switching mechanism section, 400 is a gear section thereof, and 420 is a cam gear thereof. Gear 4 of gear section 400
01,402 is coaxial single weight, still gear 403,
404 is also coaxial and single weight. The gear 402 is meshed with the gear 403, the gear 404 is meshed with the gear 405, and the gear 402 is meshed with the gear 403.
05 is meshed with the cam gear 420.

LL is the loading/unloading switching mechanism, $p, soo is its gear, 501 is a lever that rotatably supports the gear 500, 503 is a lever that uses the post 504 as a pivot point, 505 is an arrow shown (XI4-+ X2
) is a slider that can freely slide in the direction.

The lever 501 uses the pivot post 109 of the coaxially integrated gears 107 and 108 as a pivot point.

One end of the lever 503 is pin-coupled to a long hole 506 formed in the lever 501, and is always biased counterclockwise by a spring 507.
It abuts against a tongue piece 508 formed in 5. Slider 5
05 is biased in the direction of arrow X1 by a spring 509, and the cam 42 formed on the cam gear 420
1 in the direction of the arrow (Xl←X2) shown in the figure. 510 is a protrusion of the slider 505 that engages with the cam 421.

600 is a pulley attached to the motor, 601
is a belt placed between this pulley 600 and the j-9201.

The operation in the above configuration will be explained. In the following description, the operations will be explained in the order of loading -> setting of recording and playback mode -> unloading -> setting of eject mode.

(1) Explain the loading state. This is shown in FIG. The cassette is loaded and recorded.

When the playback key is operated, the gear 203 is rotated clockwise by the motor. This causes lever 204 to rotate counterclockwise due to frictional engagement with gear 203. As a result, the gear 203 meshes with the gear 101, and the gear 101 is directly rotationally driven by the gear 203. At this time, the gear 101 meshes with the gear 203 in the biting direction, so this meshing is maintained.

(2) Setting of recording and playback modes will be explained with reference to FIG. For example, when the completion of loading is detected by a switch (not shown) that detects the rotation angle of the loading ring 120, the gear 203 is driven to rotate counterclockwise by the motor. For this, lever 2
04 rotates clockwise due to frictional engagement with the gear 203. As a result, the gear 203 meshes with the gear 401,
Cam gear 420 is rotationally driven in a counterclockwise direction. By rotating this cam gear 420 (D), the main body of the mode switching mechanism releases the reel brake, sets the tag tension M/, and presses the pinch roller to set the recording and playback modes. 40), this meshing is maintained in the biting direction.

(3) The unloading state will be explained using FIG. 4. When the iso-ext key is operated, the gear 203 is rotated clockwise by the motor. As a result, lever 204 rotates counterclockwise due to frictional engagement with gear 203.

Prior to this, the lever 501 is rotated clockwise, and the gear 50θ is meshed with the gear 10. That is, the cam gear 4 shown in FIG. 2 is used to set the recording and playback modes.
21 rotates in the counterclockwise direction. With this rotation, the slider 505 is released from the restriction in the direction of the force shown by the arrow Xi, and slides in the direction of the shown arrow X1 by the elastic force of the spring 509. The protrusion 510 shown in the figure is 11 of the cam 421.
Point, move on to 912 points. As a result, the lever 503 is rotated counterclockwise by the elastic force of the spring 507, and the lever 503 is rotated counterclockwise by the elastic force of the spring 507.
Rotate clockwise to mesh gear SOO with gear 10.

Therefore, as described above, when the lever 204 rotates counterclockwise, the gear 203 meshes with the gear 500. Therefore, the rotational torque of the gear 203 is transmitted to the gear 101 via the gear SOO, and although the rotation direction of the gear 2030 is the same as during loading, the rotation direction of the gear 101 is different from that of the rope. (4) Explain the eject mode setting. When the completion of cyan loading is detected by the switch that detects the rotation angle of the loading disk 120 described above, the gear 203 is driven to rotate counterclockwise by the motor. Accordingly, the lever 204 rotates clockwise from the state shown in the fourth @, causing the gear 203 to mesh with the gear 401. As a result, the cam gear 420 rotates counterclockwise, and the main body of the mode switching mechanism releases the reel brake and unlocks the cassette holder.

Therefore, the cassette holder floats up and the cassette can be taken out.

At this time, as the cam gear 420 rotates, the slider 505 is slid by the cam 421 in the direction of arrow x2 in the figure. As a result, the lever 50 is rotated counterclockwise, and the gear 500 is separated from the gear 1θ1.
The state will be as shown in FIG.

In this state, the cassette was inserted again and recorded.

When the playback key is operated, the state shown in FIG. 2 is reached and loading is started.

In this way, the devices shown in FIGS. 2 to 4 can realize loading, unloading by unidirectional rotation of the motor, but in addition, during unloading, the meshing of gears It is possible to eliminate instability in operation due to generated force.

That is, in the unloading state shown in FIG. 4, the gear 500 meshes with the gear 101 in the escape direction, so a counterclockwise urging force is generated on the lever 501, and the accompanying force Pa causes the slider 505 tongue piece 51
A force P is generated at the joint between the lever 50 and the lever 50.

If this force P is large, the gear 500 will separate from the gear 101 if the slider 505 is mounted with poor precision, and unloading will not be possible.

In contrast, in this embodiment, a tongue piece 512 is provided at the free end of the lever 501, and when unloading, this tongue piece 512
2 and a pawl 209 provided at the free end of the lever 204 abut against each other. For this purpose, lever 204
The force P generated on the claw 209 by the urging force Pc of
The escape force of the lever 501 can be offset.

Therefore, the force P applied from the lever 501 to the slider 505 is very small.
Even if the mounting accuracy is poor, the gear SOO will not separate from the gear 101 and stable operation can be achieved.

Furthermore, bringing the lever 204 into contact with the lever 501 has the effect of determining the meshing pitch between the gear 203 and the gear 50θ, in addition to offsetting the forces described above.

Further, in the case of the above configuration, the meshing pitch between the gear 203 and the gear 101 is determined by the projection 20'l and the post 208, and the meshing pitch between the gear 2θ3 and the gear 401 is determined by the projection 206 and the post 208. have an effect.

In the above explanation, the lever 204 (D claw 209) is simply brought into contact with the tongue piece 512, but in order to prevent the lever 501 from escaping, the claw 209 is brought into contact with the tongue piece as shown in FIG. 512 may be actively hooked.

Further, it goes without saying that the present invention may be such that unloading is performed in the state shown in FIG. 2 and loading is performed in the state shown in FIG. 4.

FIG. 6 is an exploded perspective view of the apparatus shown in FIGS. 2 to 4, and FIG. 6 is a side view as well.

In the figure, a motor 6θ is attached to a pulley 601.
2 is fixed to the main pastry.

The rotation post 205 of the pulley 201 is fixed to the main pace 30. The gear 203 is pivotally supported by a post 211 provided on the lever 204 while being preloaded in the cistrus direction by a spring 210 . Gears 401-4
05 is interlocked with posts 406 to 408 fixed to the base, ensuring a meshing pitch.

Gear 101~1080 Rotating post 111, 110°10
9 is attached to a substrate 112 fixed to the pace l. The rotation post 113 of the worm gear 104 and the bevel gear 103 is fixed to the base plate 112 and mounted on the base 114.
It is attached to.

The cam gear 420 is fixed to the pace station and the rotation post 42
It is attached to 2.

The gear 500 is a rotating post 51 fixed to a lever 501.
It is attached to 3.

〔Effect of the invention〕

As described above, according to the present invention, since the direction of rotation of the motor can be made the same during loading and unloading, it is possible to lighten the load on the motor control circuit, and also to reduce the burden on the motor control circuit during loading and unloading. A magnetic recording/reproducing device that can improve operational reliability can be provided.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a VTR currently considered to be one in which magnetic tape loading, unloading, and mode switching are performed by a single motor, and FIG. 2 shows a first embodiment of the present invention. In particular, FIG. 3 is a diagram showing the loading state, FIG. 3 is a diagram similarly showing the mode switching state, FIG. 4 is a diagram similarly showing the unloading state, and FIG. 6 is an exploded perspective view of the embodiment shown in FIGS. 2 to 4, and FIG. 7 is a side view thereof. 10...Tape loading mechanism section, 101°106
．． 107, 108...gear, 102, 103...
Bevel gear, 104... Worm gear, 105...
Worm wheel, 20... Driving unit, 201... Pulley, 202, 203... Gear, 204... Lever,
209... Claw, 50... Loading/unloading switching unit, 500... Gear, 501... Lever, 503... Lever, 505... Slider, 50
7゜509...Spring, 40...Mode switching section. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4 Figure 5 WjA

Claims (1)

[Scope of Claims] A magnetic recording and reproducing device that performs recording and reproduction by winding a magnetic tape at a predetermined angle around a cylinder equipped with a rotating head, which includes an operation of winding the magnetic tape around the cylinder and removing the magnetic tape from the cylinder. A first gear part for performing an operation and a second gear part are supported, and the second gear part is placed in a position where it meshes with the first gear part and a position where it is separated from the first gear part. supports a rotatable first rotary lever and a third gear portion rotationally driven by a motor;
According to the rotational direction of the third gear part, the third gear part is rotatable in a direction toward the first gear part and in a direction away from the second gear part, and in a direction to bring it towards the first gear part. When rotating, if the second gear part meshes with the first gear part, the third gear part meshes with the second gear part, and the second gear part meshes with the second gear part. a second rotary lever that causes the third gear portion to mesh with the first gear portion if the third gear portion is not meshed with the first gear portion; A magnetic recording/reproducing device characterized in that the second rotary lever engages with the first lever when meshing with the gear portion.