JPS6128282Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is directed to a rotating drum having a recording/reproducing head, in which a tape is wound around a pair of reels in a cassette and stored in the cassette, and is pulled out by the reciprocal movement of a tape drawer. The present invention relates to a cassette type recording and reproducing apparatus which is wound around a tape and mounted on a predetermined tape running path, and in which the tape is run to perform recording and/or playback.

For example, in a video tape recorder (VTR), a tape consists of a loading ring and a tape pull-out pin for pulling out the tape stored on a pair of reels in a cassette and mounting it on a predetermined tape running path. The drawing means is adapted to be driven by a dedicated motor. On the other hand, a reel stand (take-up reel stand) that engages with and drives a reel housed in a cassette and around which tape is wound,
A rotary head drum equipped with a rotary head is driven by a motor that directly drives the rotary head drum through a transmission means such as a winding transmission mechanism. This transmission means must transmit to the reel stand enough driving force to wind the tape onto the reel against the load of the plurality of guide pins located between the capstan and the reel.

On the other hand, in the case of unloading, in which the tape is stored in a tape cassette by retracting the tape pull-out means, a large driving force is not required because the tape that has lost its tension due to the retreat of the tape pull-out pin is wound up. . In addition, normally, when unloading this tape, the brakes are applied to the other reel stand (supply reel stand), so if you wind the tape with the same driving force as during recording and playback, it will create a strong tension on the tape. Otherwise, the tape will be damaged. Therefore, it is necessary to provide a difference in the driving force of the reel stand between recording and reproducing and unloading, which is the time of rewinding the tape into the cassette.

On the other hand, some systems do not rotate the reel stand when unloading the tape, but instead allow the tape to sag at a specific point in the tape cassette. There is a risk of damage.

Further, in a type in which the tape drawer main stage and the reel stand are each driven by separate motors, if these motors become inoperable individually for some reason, the following inconvenience will occur. In other words, if only the drive of the reel stand becomes inoperable, the tape will slacken and fall onto the chassis where the rotating head drum, multiple fixed heads, and numerous guides are installed. Not only will this cause serious damage to the tape, but it will also become entangled with the above-mentioned items on the chassis, making it very difficult to manually remove the tape. On the other hand, if only the drive of the tape pull-out means becomes inoperative, the driving force is only transmitted to the limiter mechanism, so the tape does not slack, but the limiter mechanism continues to be in a slipping state and wear increases. In addition, even though the torque is weak, tension is applied to the same point on the tape for a long time, which can cause damage to the tape.

The present invention has been devised to eliminate the above-mentioned drawbacks, and its purpose is to eliminate the disadvantages of driving the tape pull-out means and the reel stand with separate motors, and to transfer the tape to the cassette during recording and playback. To provide a difference in the driving force of a reel stand during unloading, which is the time of rewinding, and to enable stable running of the tape and rewinding of slack tape with appropriate tape tension. Therefore, it is an object of the present invention to provide a cassette type recording and reproducing apparatus which is designed to protect tapes.

In order to achieve the above object, the present invention provides the above-mentioned cassette type recording/reproducing device, which includes a first drive means for rotationally driving the rotary drum, and a drive force of the first drive means that is connected to the reel. a first transmission means for transmitting the signal to the reel base to be engaged; a second drive means for driving the tape drawing means; and a second transmission means for transmitting the driving force of the second drive means to the reel base. a limiter mechanism provided in the second transmission means and configured to limit the driving force transmitted from the second drive means to the reel stand via the second transmission means to a predetermined value or less; 2
one-way transmission, which is provided in the transmission means and transmits the driving force transmitted from the second drive means to the reel stand via the second transmission means to the reel stand only when the tape drawing means returns. and a mechanism, and during recording and/or reproduction, the above-mentioned first
When transmitting the driving force of the first driving means to the reel stand by the transmission means and rewinding the tape mounted on the tape running path into the cassette, the second driving means transmits the driving force of the first driving means to the reel stand.
The drive means causes the tape draw-out means to move backward, and the second transmission means causes the tape draw-out means to move back.
The driving force of the driving means is transmitted to the reel stand via the limiter mechanism and the one-way transmission mechanism, and the tape is wound onto the reel engaged with the reel stand.

With the above configuration, a difference is created in the driving force of the reel stand during recording and playback and when unloading the tape, allowing for stable running of the tape with appropriate tape tension and the effect of slack tape. This makes it possible to rewind the tape and prevent the tape from becoming unnecessarily loose as much as possible.

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

First, an outline of this VTR will be explained with reference to FIG. A magnetic tape 5 is wound around the reels 2 and 3 and stored in the cassette 1 while being stretched along the opening 4. As shown in FIG. 1, this cassette 1 is adapted to be mounted on a cassette mounting device of this VTR. The reels 2 and 3 of the mounted cassette 1 engage with the reel shafts 8 and 9 protruding from the pair of reel stands 6 and 7, respectively, so the rotation of the reel stands 6 and 7 is transmitted to the reels 2 and 3. As a result, the magnetic tape 5 wound on the reels 2 and 3 is unwound from these, and the reels 2 and 3 are
It is designed so that it can be wound up into three.

A ring-shaped loading ring 10 is disposed on the side of the cassette 1. This loading ring 10 has three guide rollers 11.
It is rotatably supported in a slightly inclined state with respect to the horizontal plane. A tape pull-out pin 12 and four tape guide pins 13 are installed on the loading ring 10, and a pinch roller 15 is supported via a pinch roller arm 14. The pinch roller 15 and the tape pull-out pin 12 enter the inside of the magnetic tape 5 that is stretched over the front opening 4 of the cassette 1 through the V-shaped notch 16 formed on the bottom surface of the cassette 1. I'm here. Therefore, when the loading ring 10 rotates, the magnetic tape 5 is stretched over a predetermined tape running path.

A rotating head drum 17 is disposed inside the loading ring 10, and this rotating head drum is directly driven by a motor 18 disposed directly below it. This motor 18 also drives the reel bases 6 and 7. For example, the reel base 6 on the winding side is driven by a pulley 19, a belt 20, a pulley 21, and a pulley 22.
The motor 18 drives the drive mechanism 1 through a pulley 22, a belt 23, a pulley 24 and a friction wheel 25.

Inside the loading ring 10, in addition to the rotating head drum 17, there is a full-width erasing head 2.
6, an audio erase head 27, a combination head 28, a tape guide pin 29, a capstan 30, etc. are provided. A pinch roller pressing device 34 consisting of a plunger solenoid 31, an intermediate lever 32, and a pressing lever 33 is disposed on the outside of the loading ring 10, facing the capstan 30.

Next, the loading ring driving device 35 for driving the loading ring 10 will be described in particular with reference to FIGS. 2 to 4. The output shaft of the loading ring driving motor 36 has a pulley 37
is fixed, and this pulley 37 is connected to the worm 3.
It is connected via a belt 40 to a pulley 39 attached to 8. The worm 38 meshes with the worm gear 41 to obtain a large reduction ratio. Further, a pulley 42 and a spur gear 43 are integrally connected to the worm gear 41. Spur gear 4
3 meshes with a gear 44 formed on the outer periphery of the loading ring 10.
It is designed to be driven in rotation. Also pulley 4
2 is associated with a pulley 46 via a belt 45.

This pulley 46 is rotatably supported by a support shaft 47, and a felt 48 is bonded to its lower end surface. This pulley 46 is frictionally engaged with a pulley 50 which is rotatably supported by a support shaft 47 and is pressed upward in the axial direction by a coil spring 49 via the felt 48 . Further, a ratchet 51 having four engaged portions each protruding outward is fitted in the axial direction on the end face of the pulley 50, so that the pulley 50 and the ratchet 51 rotate together. It is configured as follows. A pawl 52 is disposed close to the outer periphery of this ratchet 51.
This pawl is configured to be able to engage with the engaged portion of the ratchet 51. Therefore, this pulley 50 rotates counterclockwise in FIG. It is configured so that only the wheel spins idly.

As shown in FIG. 1, a support lever 53 is provided at the bottom of the cassette 1, and the spur gear 43 is rotatably supported by a pin 54. Further, a pulley 55 is rotatably supported by the lever 53, and the belt 5 is stretched between the pulley 55 and the pulley 50, so that the rotation of the pulley 50 can be transmitted to the pulley 55. It's becoming like that. A friction wheel 57 is attached to the pulley 55.
The friction wheels 57 are integrally connected to each other, and the rotation of the lever 53 enables the friction wheels 57 to come into contact with and separate from the outer peripheral surface of the take-up reel stand 6.

This idler support lever 53 is connected to one end of a link 59 by a pin 58. A long hole 60 is formed at the other end of this link 59, and a pin 62 implanted on an L-shaped lever 61 is fitted into this long hole 60. Further, the link 59 and the L-shaped lever 61 are connected to the coil spring 6.
It is also connected by 3. The L-shaped lever 61 is rotatably supported by a pin 64, and the pin 65 implanted on this lever 61 is
It abuts against a wall 68 of an eject button 67 that is rotatably supported by a horizontally arranged support shaft 66. The L-shaped lever 61 is urged to rotate clockwise in FIG. 1 about the pin 64 by a coil spring 69.

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

First, the loading operation will be explained with reference to FIG. 5. When it is detected that the cassette 1 has been loaded, the motor 36 starts rotating. This motor 3
6 rotation is pulley 37, belt 40, pulley 3
9, worm 38, worm gear 41, and spur gear 43 to gear 44 connected to loading ring 10, so that loading ring 10 rotates approximately counterclockwise in FIG.
Rotates 270°. As the loading ring 10 rotates, the tape pull-out pin 12 on the ring 10 hooks the magnetic tape 5 stretched along the front opening of the cassette 1 and hangs it on a predetermined tape running path. hand over. That is, the magnetic tape 5 is guided by the tape guide pins 13 and 29, and the full width erasing head 26 and the rotating head drum 1
7. It is mounted in a state where it is in contact with the audio erase head 27, the combination head 28, and the capstan 30.

In this state, if you operate the regeneration button 70 to switch to regeneration mode, for example, the plunger solenoid 31
is activated, the pressing lever 33 rotates via the intermediate lever 32 and the pinch roller 15 comes into pressure contact with the capstan 30 rotating at a constant speed, and the magnetic tape sandwiched between the capstan 30 and the pinch roller 15 5 is driven to run at a constant speed. Further, the head drum 17 is rotated by the rotation of the motor 18,
A pair of rotating heads disposed around the outer periphery of the head drum 17 come into sliding contact with the running magnetic tape 5. Furthermore, the pulley 1 is driven by the motor 18.
9, the take-up reel stand 6 is rotationally driven via a belt 20, a pulley 21, a pulley 22, a belt 23, a pulley 24, and a friction wheel 25. Therefore, the reel 2 engaged with the reel shafts 8 and 9 protruding from the reel stand 6 winds up the magnetic tape sequentially fed out from the supply reel 3. In this way, the signals recorded on the magnetic tape 5 are reproduced, and the reproduction mode is brought out.

Next, referring to FIG. 6, the unloading operation will be described. By pressing the eject button 67, the motor 36 rotates in the reverse direction, and this rotation
7. Gear 44 via belt 40, pulley 39, worm 38, worm gear 41 and spur gear 43
As a result, the loading ring 10 is now reversely rotated approximately 270 degrees clockwise in FIG.

On the other hand, when the eject button 67 is pressed, the eject button 67 rotates about the support shaft 66, so that the wall 68 of the button 67 presses the pin 65 of the L-shaped lever 61 to release the lever. 61 is rotated counterclockwise in FIG. 6 about the pin 64. For this purpose, the pin 62 implanted at one end of this lever 61 is connected to the elongated hole 60 of the link 5.
At this time, the link 59 is connected to the coil spring 6.
3. The support lever 5 is therefore connected to this link 59 via a pin 58.
3 rotates clockwise in FIG. 6 about the pin 54, so the friction wheel 57 supported by the lever 55 comes into contact with the reel stand 6. In this case, this friction wheel 57 is connected to the pulley 37 and the belt 4.
0, pulley 39, worm 38, worm gear 4
1, pulley 42, belt 45, pulley 46, felt 48, pulley 50, belt 56 and pulley 5
5, the reel stand 6 is also rotationally driven. Therefore, the take-up reel 2 engaged with the reel shaft 8 of the reel stand 6 winds up the magnetic tape 5 loosened by the loading ring 10 being reversed clockwise and stores it in the cassette 1. do. When the loading ring 10 is completely returned and the loaded magnetic tape 5 is completely housed in the cassette 1, the cassette 1 is ejected and taken out from the VTR main body.

In this way, in this VTR, the rotation of the loading ring 10 during the unloading operation and the reel stand 6 engaged with the reel 2 for winding the loose magnetic tape 5 are carried out by the same motor 3.
6. Therefore, even if the load applied to the motor 18 increases for some reason, only the loading ring 10 will not move back with the magnetic tape 5 remaining on the tape running path. For this reason, dew condensation causes the surface of the rotating head drum 17 to become exposed to the magnetic tape 5.
Even if it sticks, unloading is possible.

In the above-mentioned unloading operation, the timing between the start of rotation of the motor 36 in response to the operation of the eject button 67 and the contact of the friction wheel 57 with the reel stand 6 is such that the friction wheel 57 is first crimped onto the reel stand 6. and then the motor 36 is configured to start. Therefore, for example, if the eject button 67 is pressed during the loading operation, the friction wheel 57 first comes into contact with the reel stand 6. At this time, since the motor 36 is rotating in the forward direction, the reel 2 on the reel stand 6 unwinds the magnetic tape 5. After this, the direction of rotation of the motor 36 will be switched, so there is a risk that the magnetic tape 5 will loosen between the time the friction wheel 57 contacts the reel stand 6 and the time the motor 36 reverses. .

Therefore, in this VTR, the ratchet 5
1 and a pawl 52, and which allows the ratchet 51 to rotate in only one direction, a one-way transmission mechanism is provided so that the pulley 50 rotates only when the motor 36 rotates in reverse. Therefore, troubles occurring during the period from when the friction wheel 57 is pressed against the reel stand 6 to when the motor 36 is reversed can be completely prevented.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the technical idea of the present invention.

As described above, according to the present invention, the driving force of the reel stand can be differentiated between when recording and reproducing the tape and when unloading the tape into the cassette, thereby increasing the tape's performance. During recording and reproduction, the reel stand is rotated by a large driving force from the first driving means via the first transmission means, so that stable recording and reproduction can be achieved with appropriate tape tension due to this large driving force. Therefore, stable recording and reproduction can be performed.

And when unloading the tape, the second
Since the reel stand is rotated by a weak driving force transmitted through the limiter mechanism and the second transmission means, which have a weak transmission force from the driving means, the slack tape is rewound by the weak tape tension generated by this weak driving force. At the same time, the tension on the tape caused by the discrepancy between the amount of slack in the tape due to the backward movement of the tape pull-out means and the amount of winding of the tape is absorbed by the slip of the limiter mechanism of the weak transmission mechanism. Therefore, no excessive force is applied to the tape, and damage to the tape is extremely reduced.

Further, when unloading the tape, the second drive means drives the tape pull-out means, and the reel stand is simultaneously driven via the second transmission means. Therefore, if the second drive means becomes inoperable for some reason during tape unloading, both the tape pull-out means and the reel stand will become inoperable. Unlike other methods, it does not cause serious damage to the tape.

Further, the reel stand is driven by the second drive means only when unloading the tape, and at this time the tension on the tape is gone and the load on the tape pull-out means is reduced. Therefore, by utilizing this surplus power of the second driving means to drive the reel stand, it is possible to achieve an energy-saving and very rational design.

Further, a second transmission mechanism includes a one-way transmission mechanism that transmits the driving force transmitted from the second driving means to the reel stand via the second transmission means to the reel stand only when the tape pull-out means returns. It was established in Therefore, at the moment when the tape is switched to the tape unloading state in the middle of the tape unloading operation, there is a risk that the tape may be unexpectedly fed out from the reel by the driving force of the second driving means, causing the tape to become unnecessarily slack. There is.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a cassette-type VTR, in which FIG. 1 is a schematic plan view thereof, FIG. 2 is a plan view of a loading drive device, and FIG. - line sectional view, Figure 4 is an exploded perspective view of the unidirectional rotation means, Figure 5 is a plan view of the VTR after the loading operation has been completed, and Figure 6 is the view after the unloading operation has been completed. FIG. 3 is a plan view of a VTR. In addition, in the symbols used in the drawings, 1...tape cassette, 2... reel, 5... tape, 6
... Reel stand, 10 ... Loading ring (tape drawing means), 12 ... Tape drawing pin (tape drawing means), 17 ... Rotating drum, 18
...Motor (first driving means), 19, 21, 2
2, 24...Pulley, (first transmission means), 20...
... Belt (first transmission means), 25 ... Friction wheel (first transmission means), 35 ... Loading drive device (second drive means), 42, 46, 50, 55
...Pulley (second transmission means), 45, 56...
Belt (second transmission means), 51... Ratchet (one-way transmission mechanism), 52... Pawl (one-way transmission mechanism), 57... Friction wheel (second transmission means), 48...
...felt (limiter mechanism), 49... coil spring (limiter mechanism).

Claims (1)

[Claims for Utility Model Registration] The tape 5 wound around the pair of reels 2 and 3 in the cassette 1 and stored in the cassette 1 is pulled out by the forward movement of the tape pull-out means 10 and 12 to record the tape. In a cassette type recording and reproducing apparatus, the tape 5 is wound around a rotating drum 17 having a reproducing head and mounted on a predetermined tape running path, and the tape 5 is run in this state for recording and/or reproducing. 17, a first driving means 18 for rotationally driving the first driving means 17, first transmitting means 19 to 25 for transmitting the driving force of the first driving means 18 to the reel stand 6 that engages with the reel 2, and the tape drawer. a second driving means 35 for driving the means 10, 12;
second transmission means 42, 45, 46 for transmitting the driving force of the second driving means 35 to the reel stand 6;
50, 55 to 57, and the second transmission means 42,
45, 46, 50, 55-57 and from the second drive means 35 to the second transmission means 4.
2, 45, 46, 50, 55-57, limiter mechanisms 48, 49 that limit the driving force transmitted to the reel stand 6 to a predetermined value or less, and the second transmission means 42, 45, 46, 50, 55 to 57 and from the second driving means 35 to the second driving means 35.
Transmission means 42, 45, 46, 50, 55-57
and one-way transmission mechanisms 51 and 52 that transmit the driving force transmitted to the reel stand 6 through the reel stand 6 only when the tape pull-out means 10 and 12 move backward, during recording and/or reproduction. When the driving force of the first driving means 18 is transmitted to the reel stand 6 by the first transmitting means 19 to 25 and the tape 5 mounted on the tape running path is rewound into the cassette 1, The second driving means 35 causes the tape drawing means 10 and 12 to move back, and
Said transmission means 42, 45, 46, 50, 55-5
7 transmits the driving force of the second driving means 35 to the reel stand 6 via the limiter mechanisms 48, 49 and the one-way transmission mechanisms 51, 52,
A cassette type recording/reproducing apparatus characterized in that the cassette is wound up on a reel 2 engaged with the reel stand 6.