JPS5813492Y2 - Cassette type recording/playback device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a recording/reproducing device which is configured to pull out a recording tape housed in a cassette by a tape pull-out means, install it on a predetermined tape running path, and perform recording/reproduction. .

In a cassette-type VTR (video tape recorder) in which the magnetic tape inside the cassette is pulled out by a loading ring and mounted on the tape running path, an unloading operation is performed to store the mounted magnetic tape in the cassette. At this time, it is necessary to drive the reel stand on the winding side so that the magnetic tape loosened by the backward movement of the loading ring is wound onto the reel inside the cassette.

Conventionally, the reel stand was driven during this unloading by the reel stand drive mechanism used in recording and playback modes, but with this method, the rotational speed of the reel stand was relatively low. Since it is small, it takes time to unload it, and the winding torque of the reel stand is large, so the magnetic tape has to be drawn out from the reel stand on the feeding side.

The present invention was developed in view of these problems, and its purpose is to speed up unloading by increasing the rotational speed of the reel stand on the tape winding side during unloading, and to reduce the winding torque. The purpose is to prevent excessive torque from being applied to the reel stand on the take-up side and cause the tape to come out from the reel on the feed-out side.

In order to achieve this objective, the present invention includes a reel stand that is housed in the cassette and can be held together with a reel for winding the recording tape, a motor for driving the reel stand, and a motor for driving the reel stand. a reel stand drive mechanism having a motor for driving, a torque limiter mechanism for transmitting rotational force from the motor to the reel stand, and an unloading rotation for accelerating the rotation from the motor and changing the rotation direction. The reel includes a driving member and a loading drive mechanism that transmits rotational force from the motor to a loading device, and in a recording or reproducing state, the rotation of the motor is transmitted to the reel base via the reel base drive mechanism. At the same time, when unloading the recording tape, the direction of the rotational force of the motor is reversed, and the rotational force of the motor is transmitted from the reel stand drive mechanism to the reel stand via the unloading rotation drive member. Accordingly, the mounted recording tape is wound and stored in the cassette.

Therefore, according to the present invention, a slack recording tape can be quickly wound up with an appropriate torque.

An embodiment in which the present invention is applied to a VTR will be described below with reference to the drawings.

FIG. 1 shows a plan view of a VTR equipped with a cassette.

A magnetic tape 2 housed in a cassette 1 is wound around a pair of reels 3, 4 with both ends fixedly attached to the reels 3, 4.

These reels 3 and 4 are rotatably supported within the cassette 1, and when the cassette 1 is installed in the VTR, the reel shafts 7j connected to the reel stands 5 and 6 respectively
8 and can be rotated by these reel stands 5, 6□, respectively.

As shown in FIG. 4, a step is formed on the outer periphery of the reel stand 6 on the winding side, and a large diameter portion 9 and a small diameter portion 10 are formed by this step.

A rubber ring 11 is fitted around the outer periphery of the large diameter portion 9.

A forward idler 12 is disposed opposite the outer periphery of the reel stand 6 on the winding side.

The fored idler 12 is rotatably supported by a support shaft 13.

This idler 12 also has a large diameter part 14 and a small diameter part 1 due to the difference in level.
5 is comprised.

A disk 16 is fixed to the upper end of the spindle 13 that supports the idler 12, and a pair of U-shaped notches 17 formed in the disk 16 allow the spindle 13 to rotate. A pin 19 implanted in another disc 18 that is supported
are engaged with each other, so that rotational force is transmitted from the disc 16 to the disc 18.

Also, a coil spring 20 is provided between the disc 16 and the disc 18.
is interposed therein, and a felt ring 21 is bonded to the bottom surface of the disc 18.

Therefore, the rotation of the disc 18 is transmitted to the forward idler 12 via the frictional force between the felt ring 21 and the upper surface of the idler 12.

A pulley 22 is fixed to the outer circumference of the support shaft 13 at the lower part of the fored idler 12.

The pulley 22 is connected to a pulley 7' by a belt 24 as shown in FIG.

This pulley 23 is fixed to a support shaft 25, and a rapid feed idler 26 and a pulley 27 are fixed to this support shaft 25.

Pulley 22, pulley 27 and idler 26 are therefore configured to rotate together.

Further, the pulley 27 is associated with a pulley 30 attached to the rotating shaft of a reel drive motor 29 by a belt 28.

Further, a rewind idler 31 is disposed on the side of the fast-forward idler 26.

Further, an unloading idler 32 is disposed on the side of the forehand idler 12.

The idler 32 is rotatably supported on an arm 33 by a pin 34 implanted in the arm 33.

One end of this arm 33 is connected to a switching lever 35 via a pin 36.

The switching lever 35 is rotatably supported by a pin 37, and one end is in contact with a protruding piece 39 of the eject slider 38.

The eject slider 38 has an eject button 38a fixed at its tip, and a pair of elongated holes 40, which were previously formed in the slider 38, are guided by a pair of pins 41. It is supported so that it can slide in the direction.

The other end of the arm 33 is pulled by a coil spring 42.

A rubber ring 43 is fitted around the outer periphery of the unloading idler 32 (see FIG. 6).A ratchet gear 44 is integrally connected to the idler 32. Opposing ratchet pawl 4
5 are arranged.

This ratchet pawl 45 is rotatably supported by the pin 36, and is urged to rotate by a coil spring 46 in the direction of meshing with the ratchet gear 44.

The ratchet pawl 45 and the ratchet gear 44 cause the unloading idler 32 to rotate counterclockwise in FIG. 1, but not clockwise.

A loading ring driving idler 47 is disposed on the side of the pulley 21.

This idler 47 is attached to a pin 4 on the idler support lever 48.
9.

The idler support lever 48 is rotatably supported by a pin 50.

This pin 50 has yet another limiter l//<-51
is rotatably supported, and this limiter lever 51
A limiter spring 52 is stretched between the support lever 48 and the support lever 48 .

The tip of the enclosed limiter lever 51 is associated with a plunger 530 and rod 54.

A pulley 55 is connected to the idler 47 for driving the loading ring of the sprout, and this pulley 55 is connected to the belt 5.
It is associated with pulley 57 via 6.

A gear 58 is connected to the boo 957 and is configured to rotate together with the pulley 57.

This gear 58 meshes with a gear 59 formed on the outer periphery of the loading ring 60.

Further, the inner peripheral surface of the loading ring 60 is held by three guide rollers 61, and is rotatably supported by these.

Inside this loading link 60, there is a rotary head drum 62 equipped with a magnetic head for imaging, and a whole-meat erasing head 6.
3, an audio erasing head 64, a combination head 65, a tape guide 66, a capstan 67, etc. are provided.

Note that a flywheel 68 is fixed to the capstan 67.

Also, on the loading ring 60 is a tape pull-out pin 69.
A pinch roller 70 is supported via a pinch roller support lever 71.

Next, the operation of the VTR with the above configuration will be explained.

1. As shown in FIG. 1, when the cassette 1 is installed in the VTR main body, the installation of the cassette 1 is detected by a microswitch (not shown), which supplies power to the motor 29 and also supplies power to the plunger 53. Power is also supplied.

Then, as shown in FIG. 2, the plunger rod 54 is attracted and the limiter lever 51 is moved to the second
Rotates clockwise in the figure.

Therefore, the support lever 48 is also rotated clockwise in FIG. 2 about the pin 50 by the limiter spring 52.

For this purpose, a loading ring drive idler 47 supported by this lever 48 via a pin 49 comes into contact with the pulley 27.

Therefore, the counterclockwise rotation of the motor 29 is transmitted to the gear 59 formed on the loading ring 60 via the pulley 30, belt 28, pulley 27, idler 47, pulley 55, belt 56, pulley 57, and gear 58. .

As a result, the loading ring 60 is guided by the three guide rollers 61 and begins to rotate counterclockwise in FIG. 2.

Note that since this loading ring 60 is arranged in a slightly inclined state with respect to the cassette 1, when the loading ring 60 rotates, the tape pull-out pin 69 and the pinch roller 70 on this loading ring 60
pulls out the magnetic tape 2 from the cassette 1 and mounts the magnetic tape 2 so as to be in contact with the rotary head drum 62, the full erase head 64, and the combination head 65.

When the loading ring 60 rotates approximately 270 degrees, this amount of rotation is detected by a loading end detection switch (not shown), and the power supply to the plunger 53 is cut off, thereby separating the idler 47 from the pulley 27.

Therefore, the transmission of rotational force to the loading ring 60 is cut off, and the loading ring 60 stops rotating.

This state is the stop mode, and when the forward button (not shown) is operated in this stop mode, the playback mode shown in FIG. 3 appears.

That is, when the forward button is operated, the pinch roller support lever 71 is rotated, and the pinch roller 70 supported by the lever 71 presses the magnetic tape 2 against the cap stand 67 which rotates at a predetermined number of rotations.

Therefore, the magnetic tape 2 is sequentially fed out from the reel 3 on the feeding side, and the whole erase head 63, the rotary head drum 62,
It travels while slidingly contacting the audio erasing head 64 and the combination head 65.

Further, by operating the forehand button, the tour idler 12 moves, and as shown in FIG. Contact.

Therefore, the rotation of the motor 29 is performed by the pulley 30, the belt 28, the pulley 27, the pulley 23, the belt 24, the pulley 22, the spindle 13, the disc 16, the notch 17, the pin 19, the disc 18, the felt ring 21, and the idler 12. It is transmitted to the reel stand 6 via the small diameter portion 15 of.

Therefore, the reel 4 that engages with the reel shaft 8 of this reel stand 6
The magnetic tape 2 that has been run is wound up.

In this way, the video signal and audio signal recorded on the magnetic tape 2 are reproduced, and the reproduction mode is brought out.

In the recording mode, the rotary head supported by the rotary head drum 62, the whole erase head 63, the audio erase head 64, and the combination head 65
Although the electrical connection to the magnetic tape 2 changes, the running state of the magnetic tape 2 is exactly the same as in the above-described reproduction mode.

Next, the unloading operation will be described with reference to FIG.

As the eject button 38a is depressed, the eject slider 38 is guided by the pin 41 and moves upward, which activates a microswitch (not shown) to switch the power supply circuit to the motor 29. rotates clockwise in FIG.

Further, as the eject slider 38 moves in response to the suppressing operation of the eject button 38a, a microswitch (not shown) is switched, the plunger 53 is activated, and the rod 54 is sucked. rotate in the direction.

For this purpose, the idler support lever 48 also rotates clockwise about the pin 50 via the spring 52, and the idler 47 comes into contact with the pulley 27.

Therefore, the rotation of the motor 29 is controlled by the loading ring 6 through the pulley 30, belt 28, pulley 27, idler 47, pulley 55, belt 56, pulley 57, and gear 58.
0, and the loading ring 60 now rotates in the unloading direction, that is, clockwise in FIG.

Further, as the eject slider 38 moves forward, the protruding piece 39 of the slider 38 separates from one end of the switching lever 35, so that the switching lever 35 is moved by the coil spring 42.
is pulled by the arm 33 and rotates counterclockwise about the pin 37.

Therefore, as shown in FIG.
Contact with 0.

Therefore, the rotation of the motor 29 is caused by the pulley 30, belt 28,
Pulley 27, pulley 23, belt 24, pulley 22, spindle 13, disc 16, notch 17, pin 19, disc 18,
It is transmitted to the reel stand 6 on the winding side via the felt ring 21, the large diameter part 14 of the idler 12, the unloading idler 32, and the small diameter part 10 of the reel stand 6.

For this purpose, a reel shaft 8 is connected to this reel stand 6.
Loading ring 60 by reel 4 engaging with
As the magnetic tape 2 is rotated backward, the loosened magnetic tape 2 is wound up.

Note that when winding the slack magnetic tape 2 at this time, the large diameter portion 14 of the idler 120 and the small diameter portion 16 of the reel stand 6 come into contact via the idler 32, so the reel stand 6 is placed in the playback mode housing. The rotational speed is higher than that in the recording mode or in the recording mode, and therefore the unloading operation is performed quickly.

Moreover, since the winding torque is conversely reduced, the magnetic tape 2 is not pulled out from the feed-out side roll 3.

In addition, since the tape is wound up by increasing the speed during unloading, the limiter mechanism between the felt ring 21 and the upper surface of the forward idler 12 is closed during playback mode or recording mode. Since the slip can be set small, it is possible to stabilize the winding torque in these modes.

When the unloading operation is performed as described above and the loading ring 60 rotates approximately 270° and returns to the initial position, the end of loading is detected by a microswitch (not shown), and the power to the plunger 53 is turned off. The supply is cut off and the idler 47 separates from the pulley 27.

The eject slider 38 is unlocked and moves backward, and the protrusion 39 presses one end of the switching lever 35 accordingly.

For this purpose, the idler 32 is connected to the reel stand 6 and the idler 1.
Separate from 2.

The cassette 1 is ejected from the VTR main body, and the unloading and ejecting operations are completed.

Note that the idler 32 is provided with a ratchet mechanism, but if the eject button 38a is pressed by mistake during loading, the idler 32 is pressed against the idler 12 and the reel stand 6, and the reel on the take-up side is This is to prevent the magnetic tape 2 from being fed out from the tape 4.

As described above, according to the present invention, when unloading a mounted recording tape, the direction of the rotational force of the motor is reversed, and the rotational force of the motor is transferred from the reel stand drive mechanism to the reel via the unloading rotational drive member. It is configured to wind the mounted recording tape by transmitting the signal to the reel stand, and since the unloading rotary drive member increases the speed and changes the rotation direction, the reel stand rotates at an increased speed. Driven.

Therefore, the unloading operation becomes faster, and the winding torque is also reduced, so that excessive torque is not applied to the reel stand on the winding side. Nor.

Furthermore, since the reel stand drive mechanism has a torque limiter mechanism, excessive torque is further prevented from being applied to the reel stand on the winding side not only during recording and playback but also during unloading. □It is safe.

According to the present invention, since the loading device is also configured to be driven by the same motor as the reel stand, it is possible to drive the loading device during unloading and wind up the tape that loosens accordingly. Driven by the same motor at the same time.

For this reason, it is easy to synchronize the driving of the loading device and the driving of the reel stand, which is advantageous in that it further prevents abnormal tape slack and abnormal tape tension that would otherwise occur due to extremely different timings between the two.

Further, since there is less slip in the torque limiter mechanism, the durability of the device can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a VTR. Fig. 1 is a plan view of the main part of this VTR with a cassette installed, and Fig. 2 is a plan view of the main part showing the same loading state. Fig. 3 is a plan view of the main part in the playback mode, Fig. 4 is a sectional view taken along the line ■ to -■ in Fig. 3, Fig. 5 is a plan view of the main part showing the unloading state, and Fig. 6 is a plan view of the main part in the playback mode. It is a sectional view taken along the line ■ to ■ in Figure 5 □. In addition, in the symbols used in the drawings, 1 is a cassette, 2 is a magnetic tape, 4 is a reel, 6 is a reel stand, 12 is a front idler (reel stand drive mechanism), 21 is a felt ring (torque limiter mechanism), 29 is a reel drive motor, 32 is an asiling idler (unloading rotational drive member), 47 is a loading ring drive idler (loading drive mechanism), and 60 is a loading ring.

Claims (1)

[Scope of utility model registration request] In a recording and reproducing apparatus, a recording tape stored in a cassette is pulled out by a tape pulling means and mounted on a predetermined tape running path for recording and reproduction,
A reel stand that is housed in the cassette and can be engaged with a reel for winding the recording tape, a motor for driving the reel stand, and a torque limiter mechanism that transmits rotational force from the motor to the reel stand. an unloading rotational drive member for accelerating the rotation from the motor and changing the rotational direction; and a loading drive mechanism for transmitting the rotational force from the motor to the loading device. The rotation of the motor is transmitted to the reel stand via the reel stand drive mechanism in the recording case or playback state, and the direction of the rotational force of the motor is transmitted when the recording tape is unloaded. and the mounted recording tape is wound and stored in the cassette by transmitting the rotational force of the motor from the reel stand drive mechanism to the reel stand via the unloading rotation drive member. A cassette type recording and reproducing device characterized by the following configurations.