JPS6341140B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing apparatus using a cassette containing a wound magnetic tape and having an opening in a part thereof, and in particular, the present invention relates to a magnetic recording/reproducing apparatus that uses a cassette containing a wound magnetic tape and having an opening in a part thereof. This invention relates to a magnetic recording/reproducing device that can be pulled out to a contact position.

Part 5 describes the mechanism for pulling out the magnetic tape outside the cassette in this type of conventional magnetic recording/reproducing device.
6 and 6, pinch rollers 100, 101 and tape guides 102, 10
3 and a pinch roller arm 104,
105 and the moving plate 106 are connected by connecting plates 107 and 108.
This moving plate 106 is connected to a solenoid 109.
When operated with the pinch roller arms 104, 10
5 operates, pinch roller arms 104, 105
The magnetic tape 110 is drawn out of the cassette by tape guides 102 and 103 provided in the cassette and comes into contact with the heads 111, 112, and 113.
Capstan 11 with pinch rollers 100 and 101
4,115. pinch roller 100,
The magnetic tape 110 pressed against the capstans 114 and 115 at 101 is attached to the capstans 114 and 11.
It is configured such that it is driven by the rotational drive of No. 5 and records or reproduces signals.

Here, when moving the magnetic tape 110 from the first position to the second position, since the solenoid 109 is used, the operation of the solenoid 109 is rapid. 104 and 105 also move rapidly and may damage the magnetic tape 110. Furthermore, since this movement is rapid, the magnetic tape 110 may be fed from the reel more than necessary due to its inertia, causing sagging on the magnetic tape 110, or when this sagging occurs, the reel axis must be moved in the direction to remove the sagging. When an attempt is made to rotate and wind the magnetic tape 110, excessive tension is generated in the magnetic tape 110, and this reaction causes the reel shaft to rotate in a direction that causes sag in the magnetic tape 110, causing sag in the magnetic tape 110 again.The disadvantage is that the operation is repeated. Since there are shock absorbers 116 on the pinch roller arms 104 and 105,
By connecting the pinch roller arms 104 and 105 and slowing down the rapid movement of the pinch roller arms 104 and 105, the magnetic tape 110 is moved from the first position to the second position without causing sagging or damage to the magnetic tape 110.
0 is moved to record or reproduce signals.

In this case, since the moving plate 106 is operated by the solenoid 109, the pinch roller arm 10
Since the operation of 4,105 becomes rapid, the shock absorber 11
However, the buffer device 116 is unnecessary during signal recording and reproduction, and it is preferable that the buffer device 116 not be used. Also, magnetic tape 1
If the length of the drawer from the cassette No. 10 is large, the link ratio of the pinch roller arms 104 and 105 must be increased, so the solenoid 109 is left as is and only the link ratio of the pinch roller arms 104 and 105 is increased. Then,
The magnetic tape 110 is connected to capstans 114 and 115.
The pinch pressure that presses against the Since the solenoid 109 must be used, there are drawbacks such as the inability to downsize the device or save power.

In addition, various mechanisms have been proposed to pull out the magnetic tape inside the cassette to a position outside the cassette where it comes into contact with the capstan or magnetic head, but all of them have complicated configurations, require a large amount of space, and are difficult to drive. It had drawbacks such as large energy loss.

The present invention has been made in view of the above circumstances, and aims to provide an extremely simple configuration, occupy less space, reduce transmission loss in the drive force transmission system, and avoid applying excessive tension to the magnetic tape. To provide a magnetic recording/reproducing device which can extend a magnetic tape over a long distance, can instantly press a pinch roller against a capstan using a small solenoid, and can improve running stability of the magnetic tape.

In order to achieve the above-mentioned object, the present invention uses a dual capstan type cassette that contains a wound magnetic tape and has an opening in a part thereof, and has a pair of capstans that are appropriately spaced apart from each other. In a magnetic recording/reproducing device, the reel is located between a take-up reel and a supply reel and slides between a first position and a second position along a direction perpendicular to a line connecting the axes of both reels. a loading lever having a rack formed along the direction, and a pinion meshing with the rack, the loading lever is moved to the first position and the loading lever by a motor. a first drive mechanism driven to a second position and a connecting spring stretched between the loading lever and the loading lever; A solenoid is connected to a movable iron core on the other end side of a connecting rod whose side is in contact with a part of the loading lever, and the connecting rod and the movable iron core are arranged approximately in the sliding direction of the loading lever. a pair of second drive mechanisms disposed along the loading lever, one end of which is connected to one end of the connecting rod, and a pinch roller rotatably provided at the other end of the loading lever; As the pinch roller moves from the opening of the cassette to the second position, the pinch roller is driven from a rest position at the opening of the cassette to a ready position adjacent to a capstan provided outside the cassette, and the solenoid drives the pinch roller to the movable iron core. a pair of pinch roller moving mechanisms that drive the pinch rollers from the ready position to an operating position where they press against the capstan when the pinch rollers are driven against the connection spring; and a pair of pinch roller moving mechanisms that are rotatable on the pinch roller moving mechanisms. The present invention is characterized by comprising a pair of tape pull-out mechanisms for pulling out the magnetic tape inside the cassette to a position outside the cassette where it comes into contact with the capstan and the magnetic head.

Hereinafter, the gist of the present invention will be explained in detail based on the drawings.

In FIGS. 1 and 4, 1 is a base, 2 is a magnetic tape, 3 is a cassette containing the wound magnetic tape 2 and having an opening in a part, such as a video cassette, and 4 and 5 are cassettes in which the magnetic tape 2 is held. The wound reels 6 and 7 are reel motors that rotate the reels 4 and 5, and 8 and 9 are fixed to the base 1 with guide pins. 10 is a take-up reel 4 and a supply reel 5
and is guided by guide pins 8 and 9 disposed along a direction perpendicular to a line connecting the axes of both reels 4 and 5, and is positioned between the first position and the first position shown in FIG. A loading lever 11 is a motor for sliding the loading lever 10 between the second positions shown in FIGS. 2 and 3;
A pinion 12 is attached and fixed to the shaft of the motor 11, and the pinion 12 meshes with a rack formed on the loading lever 10, so when the motor 11 rotates, the loading lever 10 is connected to the guide pin via the pinion 12. Slide against 8 and 9. Here, motor 11 and pinion 12
etc. will be referred to as the first drive mechanism. Further, as shown in FIG. 4, a pin 13 is attached to the loading lever 10, and the pin 13 is used to switch the micro switches 14, 15 by sliding the loading lever 10.
, the rotation of the motor 11 is stopped, and the sliding operation of the loading lever 10 is stopped. 16, 17 are pinch roller shafts, 18, 19
is a pinch roller arm, and pinch roller shafts 16 and 17 are fixed to one end thereof. 20, 21
2 is a tape shifter holder, and 22 and 23 are tape shifters that are attached to the tape shifter holders 20 and 21 and are guides for pulling out the magnetic tape 2 from the cassette 3. 24 and 25 are pinch rollers.
Tape shifter holders 20 and 21 to which tape shifters 22 and 23 are attached and pinch rollers 24 and 25 are rotatably attached to pinch roller shafts 16 and 17, respectively.
0 and 21 can rotate about the axes of the pinch roller shafts 16 and 17, but the tape shifter holders 20 and 2
A stopper (not shown) provided at the shifter spring 28,
They are pressed together by the spring pressure of 29. 30,3
1 is an arm shaft fixed to base 1 and arm shaft 3
Pinch roller arms 18 and 19 are attached to 0 and 31, and the pinch roller arms 18 and 19 can rotate about the axes of arm shafts 30 and 31. 32,3
3 is a latching solenoid attached and fixed to the base 1, 34 and 35 are latching solenoid 3
Iron cores 2 and 33, 36 and 37 are connecting rods, one end of which is connected to iron cores 34 and 35 of latching solenoids 32 and 33 by pins 40 and 41,
The other end is connected to pinch roller arms 18, 19 and arm pins 38, 39. 42, 43
is a connecting spring. Pinch roller arm 18,1
When the solenoids 32 and 33 are not activated, the arm pins 38 and 39 attached to the loading lever 9 are connected to the upright piece provided at one end of the loading lever 10 via the connecting rods 36 and 37 by the spring pressure of the connecting springs 42 and 43. It is pressed together. 44 and 45 are capstans, 46 and 47 are tape guides that guide the running of the magnetic tape 2, 48 is an erasing head, 49 is a recording head, and 50 is a reproducing head.

Here, the latching solenoid 3 is used to selectively drive the pinch rollers 24 and 25 between a ready position close to the capstans 44 and 45 and an operating position where they are in pressure contact with the capstans 44 and 45.
2, 33, iron core 34, 35, connection rod 36, 3
7. The connection springs 42, 43, etc. will be referred to as a second drive mechanism. Also, receiving the driving force of the first and second driving mechanisms, the pinch roller 24,
The mechanical parts, ie, the pinch roller arms 18, 19, etc., which position the roller 25 in the rest position, the ready position, and the operating position, respectively, will be referred to as a pinch roller moving mechanism. Also, the magnetic tape 2 in the cassette 3
The tape shifter holder 2 is pulled out to a position where it contacts the capstans 44, 45, erasing head 48, recording head 49, and reproducing head 50 outside the cassette 3.
0, 21, tape shifters 22, 23, shifter springs 28, 29, etc. will be referred to as a tape pull-out mechanism. In this embodiment, these second drive mechanisms, pinch roller moving mechanisms, and tape drawing mechanisms include capstans 44, 45, and pinch rollers 2.
Since this is a dual capstan type magnetic recording/reproducing device having a pair of magnetic disks 4 and 25, a pair of magnetic disks 4 and 25 are respectively provided.

Next, the operation of the apparatus of the present invention constructed as above will be explained.

From a state in which the pinch rollers 24 and 25 are at rest in the cassette 3 and the magnetic tape 2 is in the cassette 3 in FIG. 1, the pinch rollers 24 and 25 are prepared to approach the capstans 44 and 45 in FIG. 3, the magnetic tape 2 is pulled out of the cassette 3, and the pinch rollers 24, 25 are pulled out from the capstan 44, 4.
5, the magnetic tape 2 contacts the heads 48, 49, 50, and the capstan 4
The operation in which the pinch rollers 24, 25 are brought into pressure contact with the rollers 4, 45 and move to a running state will be described.

In FIG. 1, when the motor 11 is slowly rotated through a speed reducer, the loading lever 10 in the first position is guided to the guide pins 8 and 9 via the pinion 12 by the rotation of the motor 11. and slide. Pinch roller arm 18, 19
Since the arm pins 38, 39 attached to the loading lever 10 are pressed by the connecting springs 42, 43, the pinch roller arms 18, 1
Since arm pins 38 and 39 are operated by sliding of loading lever 10, pinch roller arms 18 and 19 rotate about arm shafts 30 and 31 as fulcrums. On the other hand, the arm shaft 30,
Pinch roller arm 18 with axis 31 as a fulcrum,
The latching solenoid 3 is activated by the rotational movement of 19.
The iron cores 34 and 35 of 2 and 33 are connecting rods 36 and 3
7 is connected by arm pins 38, 39 and pins 40, 41, so the latching solenoid 3
The iron cores 34 and 35 of 2 and 33 move deeply into the latching solenoids 32 and 33 in conjunction with the operation of the pinch roller arms 18 and 19. Pinch roller shafts 16, 1 of pinch roller arms 18, 19
Since the pinch rollers 24, 25 and the tape shifter holders 20, 21 are pivotally attached to the pins 7, the rotation of the pinch roller arms 18, 19 with the arm shafts 30, 31 as fulcrums causes the pinch rollers 24, 24, 25 and tape shifter holder 20,
21 will be moved to the outside of the cassette 3. During this movement, the tape shifter holders 20 and 21 can rotate around the pinch roller shafts 16 and 17;
0 and 21 are provided with tape shifter guides 53 and 54, and the guide 5 formed on the base 1
1 and 52, and is pressed against the cam surfaces formed on the side surfaces of the guides 51 and 52 by the spring pressure of the shifter springs 28 and 29, so that it moves along the cam surfaces of the guides 51 and 52 while being pressed against them. The magnetic tape 2 is pulled out of the cassette 3 through the tape shifters 22 and 23 provided on the moving tape shifter holders 20 and 21, and the magnetic tape 2 is pulled out from the cassette 3, and is transferred to the capstans 44 and 45, the tape guides 46 and 47, the erasing head 48, and the recording head 48. It contacts the head 49 and the reproducing head 50, respectively. At the time of this contact, the pinch rollers 24 and 25 are in a position close to the capstans 44 and 45, and the loading lever 10
Since the pin 13 provided in the
rotation stops. Therefore, the operation of the loading lever 10, which is slid by the motor 11, stops at the second position, and the pinch roller arm 1
The operations of 8 and 19 also stop. That is, the magnetic tape 2 has been pulled out from the position shown in FIG. 1 to the position shown in FIG. 2.

Next, the state in which the magnetic tape 2 is pulled out to the position shown in FIG. 2 is changed to the state shown in FIG. Explain.

When the latching solenoids 32 and 33 are energized in the state shown in FIG. 2, the iron cores 34 and 35 are attracted. This suction action causes the pinch roller arms 18, 19 to move the latching solenoid 32,
The arms rotate about arm shafts 30 and 31 via connecting rods 36 and 37 connected to iron cores 33 and 33, respectively. At this time, the arm pins 38 and 39 have stopped sliding on the loading lever 10, so
It separates from the previously pressed state. When the pinch roller arms 18 and 19 are rotated about the arm shafts 30 and 31, the magnetic tape 2 is moved to the capstans 44 and 4 by the pinch rollers 24 and 25.
5, as shown in FIG. 3, and the magnetic tape 2 is driven by the capstans 44 and 45.
Although the above description uses a latching solenoid that can maintain the solenoid in the suction position even when the current is turned off, a normal solenoid may also be used.

Next, the operation of storing the magnetic tape 2 in its original position, that is, in the cassette, will be explained.

When the latching solenoids 32, 33 are energized and the suction hold of the latching solenoids 32, 33 is released, the latching solenoids 32, 33 are connected to the iron cores 34, 35 and the connecting rods 36, 37. It is pulled back by springs 42 and 43. The connecting rods 36 and 37 that are pulled back are
Since the pinch roller arms 18 and 19 are connected to the pinch roller arms 18 and 19 with the arm pins 38 and 39, the pinch roller arms 18 and 19 are also pushed back, but the loading lever 10 with the arm pins 38 and 39 in the position shown in FIG. When the pinch roller arms 18 and 19 come into contact with the upright pieces formed in the upper part, the pushing back operation of the pinch roller arms 18 and 19 stops. Here, the magnetic tape 2 is connected to capstans 44 and 45 by pinch rollers 24 and 25.
The magnetic tape 2 is no longer pressurized, causing sag on the magnetic tape 2. However, since the reel motor operates in a direction to remove the sag, no sag occurs on the magnetic tape 2.

Next, the operation of returning from the state shown in FIG. 2 to the original position shown in FIG. 1 will be described.

By changing the polarity of the power supply to the motor 11 and driving the motor 11 in reverse rotation, the loading lever 10 is slid through the pinion 12 and the rack, but is returned using the guide pins 8 and 9 as a guide. Here, the arm pins 38 and 39 attached to the pinch roller arms 18 and 19 are pressed against the loading lever 10 by the spring pressure of the connection springs 42 and 43, so when the loading lever 10 returns, the arm pins 38 and 39 39 is in pressure contact with the loading lever 10, the pinch roller arm 1
8 and 19 also rotate around the arm shafts 30 and 31 and return. When the loading lever 10 returns to the position shown in FIG. 1, that is, the original position, the pin 1 provided on the loading lever 10
3 presses the micro switch 15 to turn off the power to the motor 11 and stop the rotation of the motor 11.
The loading lever 10 stops sliding.

Furthermore, the magnetic tape 2 is wound onto the reels 4 and 5 by the reel motors 6 and 7 until it returns to its original position. Therefore, the magnetic tape 2 is the cassette 3.
and returns to its original position as shown in FIG.

As is clear from the above description, according to the present invention, it is possible to provide a magnetic recording/reproducing device having many advantages as described below.

First, it has the advantage of being extremely simple in structure, occupying little space, and being manufactured at low cost.

That is, the components include a first drive mechanism consisting of a motor and a pinion, a second drive mechanism consisting of a solenoid, an iron core, a connecting rod, and a connecting spring.
It is a simple device that uses a pair of pinch roller moving mechanisms and a pair of tape pull-out mechanisms respectively provided on the pair of pinch roller moving mechanisms. The loading lever, the connecting rod, and the solenoid, which have a large capacity, are configured to slide along the direction perpendicular to the line segment connecting the axes of both reels, which is located between the take-up reel and the supply reel. It occupies less space on a plane, and since the motor's driving force is directly transmitted from the pinion to the rack formed along the sliding direction of the loading lever, the three-dimensional space can also be reduced. Also, since a cam with large frictional force is not used, transmission loss of driving force can be reduced.

Second, the rational design allows for less strain on the solenoid, thus allowing the use of shorter actuation strokes and smaller capacity solenoids.

That is, the large stroke to pull out the magnetic tape in the cassette is performed by sliding the loading lever using a motor, and the small stroke to drive the pinch roller from the ready position to the operating position is performed by a solenoid. In particular, the first feature is that the loading lever and the iron core of the solenoid are configured to move the same amount in the same direction, and when the loading lever is driven to the second position. The second feature is that the iron core is configured to enter the operating range of the solenoid, and even though the iron core moves the same amount as the loading lever, it does not pull the pinch roller from the operating position to the ready position. The third feature is that the spring force (returning elasticity) by the connecting spring is always kept constant by extending the connecting spring for returning the iron core and the loading lever. The stroke of the solenoid can be shortened by the first characteristic configuration, and the capacity of the solenoid can be reduced by the second and third characteristic configurations.

Thirdly, since the second drive mechanism, the pinch roller moving mechanism, and the tape pull-out mechanism are provided in pairs (two units) each, the two solenoids in the pair of second drive mechanisms are activated at different timings. Electricity can be applied, so that slack in the magnetic tape can be appropriately removed.

That is, pull out the magnetic tape from inside the cassette, and
When the two capstans are brought into contact, slack naturally occurs between the two capstans, but if the pinch roller presses the magnetic tape against the capstans while the capstans are in the slack state, touch pressure is applied to the magnetic head of the magnetic tape between the pair of capstans. This causes a drop in the level of the magnetic reproduction signal, dropout, and deterioration of the reproduction frequency characteristics in high frequencies, making it impossible to perform good magnetic recording. However, if the two solenoids are configured to be able to control energization separately, the pinch roller closest to the take-up reel is brought into pressure contact with the capstan first, and then, after the time has elapsed for the slack in the magnetic tape to be removed, the supply is stopped. The pinch roller near the reel can be controlled so as to be brought into pressure contact with the capstan, and therefore the problem caused by the loosening of the magnetic tape as described above can be solved.

Fourth, since the tape drawing mechanism is rotatably provided on the pinch roller moving mechanism, the structure can be simplified by sharing members, and it can be efficiently positioned within the narrow opening of the cassette. That is, when a magnetic tape is pressed against a capstan by a pinch roller, it is said that the running stability of the magnetic tape is better if the wrapping angle with respect to the pinch roller is small and the wrapping angle with respect to the capstan is as large as possible. Therefore, in order to satisfy the above conditions, it is more desirable that the tape pull-out mechanism be rotatable than fixed relative to the pinch roller pull-out mechanism.

[Brief explanation of the drawing]

Fig. 1 is a plan view related to the present invention, showing the magnetic tape in the cassette, Fig. 2 is a plan view showing the magnetic tape pulled out of the cassette, and Fig. 3 is the plan view showing the magnetic tape in the cassette. 4th plan view showing the state in which the pinch roller presses the capstan.
The figure is a cross-sectional view taken along line A-A' in Figure 3,
Fig. 5 is a plan view showing a conventional device with the magnetic tape in the cassette, and Fig. 6 is a plan view showing the conventional device with the magnetic tape in the cassette and pressed against the capstan by a pinch roller. be. 2...Magnetic tape, 3...Cassette, 10...Loading lever, 11...Motor, 13...Pin, 1
4, 15... Micro switch, 18, 19... Pinch roller arm, 20, 21... Tape shifter holder, 22, 23... Tape shifter, 24, 25
...Pinch roller, 32, 33...Solenoid, 3
4, 35... Iron core, 36, 37... Connection rod, 4
2, 43... Connection spring, 44, 45... Capstan, 48... Erasing head, 49... Recording head, 50
…Regeneration head.

Claims (1)

[Claims] 1. In a dual capstan type magnetic recording and reproducing device that uses a cassette that contains a wound magnetic tape and has an opening in a part, and has a pair of capstans spaced apart from each other, a take-up reel and a Located at an intermediate portion between the supply reel and the reel, the reel is disposed so as to be able to slide between a first position and a second position along a direction perpendicular to a line segment connecting the axes of both reels. a loading lever having a rack formed along the rack; and a first motor driving the loading lever to the first position and the second position via a pinion meshing with the rack. The second
a solenoid which is biased in a direction from the position to the first position and has a movable iron core connected to the other end of a connecting rod whose one end abuts a part of the loading lever; A pair of second drive mechanisms are arranged such that the rod and the movable iron core are arranged substantially along the sliding direction of the loading lever, and one end is connected to one end of the connecting rod and the other end is pinched. A roller is rotatably provided, and as the loading lever moves from the first position to the second position, the pinch roller is moved from a resting position at the opening of the cassette to an outside of the cassette. a pair of pinch rollers that are driven to a ready position adjacent to the capstan, and further drive the pinch roller from the ready position to an operating position in which the pinch roller is pressed against the capstan when the movable iron core is driven by the solenoid against the connecting spring; a pinch roller moving mechanism; and a pair of tape pull-out mechanisms rotatably provided on the pinch roller moving mechanism to pull out the magnetic tape in the cassette to a position outside the cassette where it contacts the capstan and the magnetic head. What is claimed is: 1. A magnetic recording and reproducing device characterized in that it is configured by: