JPS6236772A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To perform the loading/unloading operations of a magnetic tape with an extremely simple constitution by using the 1st and 2nd loading gears, a substrate and a rotary rod which drives forward and reverse both loading gears in the different direction from each other. CONSTITUTION:When a cam 102 starts its revolution and the revolving angle exceeds 150 deg., a cam follower 128 moves to the vicinity of an axis 100. Then a rotary rod 129 turns clockwise around a point A with an axis 145 defined as a fulcrum. Thus the 1st loading gear 106 is turned counterclockwise via the 1st gear part 130. While the 2nd loading gear is turned clockwise via the 2nd gear part 131. Therefore the 1st loading arm 110 is turned counterclockwise via a tension spring 113 and the 1st draw-out block 36 connected to the arm 110 via the 1st loading link 116 is shifted toward an arrow head B along the 1st groove 34. Thus guide posts 24 and 26 are also shifted toward B and magnetic tape 18 is drawn out of a cassette 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for pulling out a magnetic tape from a cassette having a built-in pair of reel hubs for winding the magnetic tape to the outside of the cassette, and then driving a rotating magnetic head or the like installed outside the cassette. The present invention relates to a magnetic tape device that records or reproduces signals, or records and reproduces signals (hereinafter referred to as recording/reproducing) by causing a magnetic head to run along with the recording head.

2. Description of the Related Art In general, magnetic tape devices such as cassette-type video tape recorders pull out a magnetic tape from a cassette and run it along a magnetic head. Many devices are equipped with a motor specifically for pulling out the magnetic tape, as they require a complicated latch mechanism and a plunger to switch and transmit the motor driving force to the magnetic tape drawer and tape drive unit.

However, the video tape recorder equipped with the above-described motor for drawing out the magnetic tape has a structure in which the rotation of the motor is directly transmitted, and the magnetic tape drawing member is placed in the first position from which the magnetic tape in the cassette is drawn out. Since the magnetic tape was pulled out of the cassette and moved back and forth between the second position where it was attached to the magnetic head, the stop positions of the magnetic tape pull-out member at the first and second positions were the rotation stop positions of the motor. The structure was influenced by

Therefore, in order to solve this problem, in recent years, a magnetic tape device has been proposed that has a drive means that converts the continuous rotational motion of the motor into intermittent rotational motion and drives the magnetic tape pull-out means in response to the intermittent rotational motion. It's starting to look like this.

For example, a magnetic tape device disclosed in Japanese Patent Publication No. 59-27983 has been proposed in which the driving means includes a sector gear that oscillates and a gear meshing with the sector gear.

Hereinafter, an example of the conventional magnetic tape device (% Publication No. 159-27983) mentioned above will be explained with reference to the drawings.

FIG. 9 is a top view of a conventional magnetic tape device, FIG. 10 is a back view of FIG. 9, and FIG. 11 is a lift curve diagram of a cam used in a conventional magnetic tape device.

In FIGS. 9 to 11, the shaft 4, which is planted on the substrate 2,
When the cassette 12 is installed in the main body of the apparatus, the supply reel stand 89 and the take-up reel stand 10, which are freely rotatably fitted into the cassette 12, respectively engage with the supply reel no. 149 and the take-up reel no. It has an integrally rotating structure.

The magnetic tape 18 wound on the supply reel hub 14 is
A pair of notches 20, 2 provided at the front of the cassette 12
2 and is wound around the take-up reel hub 1θ.

Guide posts 24.28 and 28.30 are disposed within the pair of notches 20.22 for pulling out and guiding two magnetic tapes, respectively. These guide posts 24 and 26 are implanted on a first drawer block 36 that slides while being guided by a first groove 34 on a sub-board 32 placed parallel to the board 2, and similarly The posts 28 and 30 are implanted on the second drawer block 4o that slides while being guided by the second groove 38 on the sub-board 32.

A pair of shafts 42.44 are implanted on the substrate 2 side of the sub-board 32, and a pair of gears 4 are rotatably attached to the shafts 42.44.
6.48 are loosely fitted so that they mesh with each other. gear 46
An elongated hole 6 formed in one end of the arm 50 that rotates integrally with the
2 is slidably fitted to the first drawer block 64, which is slidably guided on the hook 36 and is drawn against the first drawer block 3θ by the first spring 37, and therefore When the gear 46 rotates by a predetermined angle in the clockwise direction in FIG. 18 and move it to the position indicated by the dotted line in Figure 1. In this state, the first
The drawer block 36 is pressed against the stopper 26 by the elastic force of the first spring 37. Similarly, an elongated portion 56 formed at one end of an arm 66 that rotates integrally with the gear 48 is slidably guided on the second drawer block 4o, and is supported by the second spring 41 on the second drawer block 4o. Therefore, when the gear 48 rotates a predetermined angle counterclockwise in FIG. 9, the second drawer block 4o
is guided by the second groove 38 and moves in the direction of the arrow to a predetermined position, so that the guide post 28.30
8 while pulling it out to the position indicated by the dotted line in FIG. In this state, the second drawer block 40 is pressed against the striker 29 by the elastic force of the second spring 41, as described above. The pulled-out magnetic tape 18 comes into contact with a fixed head 62 and a drum 6o having a rotating head (not shown) inside, while a belt 66 is attached to a shaft 64 installed on the back side of the substrate 2.
A cam 72 having a gear on its outer periphery and driven by a motor 7o via a pulley 67 and a gear 68 is loosely fitted to be rotatable. This cam 72 has a diameter of 3600 mm as shown in FIG.
It is a positive cam with the above-mentioned linkage 4, and its lift curve is as shown in Fig. 11, with a rotation angle of 40° to 3
A cam follower, which will be described later, moves only between 600 and 600. Further, a shaft 75 is installed on the back side of the substrate 2, and a fan-shaped gear 78 having a cam follower 7e that fits into the groove 74 of the cam 72 is rotatably fitted,
The tooth portion 80 of this fan-shaped gear 78 is engaged with a small gear 84 that is loosely and rotatably fitted onto a shaft 82 that is implanted on the back side of the substrate 2. A large gear 86 that rotates integrally with the small gear 84 meshes with the aforementioned gear 48 that extends from the back side of the substrate 2 through a hole (not shown) formed in the substrate 2. That is, when the cam 72 starts rotating counterclockwise from the position shown in FIG. 10, the sector gear 78 does not move at all for the first 4o0;
From the rotation angle 4o0, the sector gear 78 rotates around the axis 75 at the 10th rotation angle.
The pinion 84 begins to rotate counterclockwise in the figure, so that the pinion 84. Through the large gear 86, the gear 46 rotates clockwise in FIG. 9 about the shaft 42, the gear 48 rotates counterclockwise in FIG. 9 about the shaft 44, and the guide posts 24.26 and 28.30 moves in the direction of the arrow and pulls out the magnetic tape 18 to the outside of the cassette 12. When the rotation angle of the cam 72 reaches 360°, the sector gear 78 stops rotating, but just before that, the first drawer block 36 and the second drawer block 4Q are brought into contact with the stoppers 25 and 29, respectively. The guide posts are 24.26 and 28°30.
When the motor reaches the position indicated by the dotted line, a switch (not shown) is turned off and the rotation of the motor stops.

On the other hand, a capstan 8 rotatably disposed on the substrate 2
8 is rotated clockwise in FIG. 9 by a capstan motor 92 via a belt 9o.

The pinch roller 94 is in the position shown by the solid line in FIG. 9 in the stop mode, and moves to the position shown in the dotted line in FIG.
is moved to the right in Fig. 9. in this case,
The transferred magnetic tape 18 is wound onto the take-up reel hub 1e by well-known means.

Next, the operation will be explained.

When the record/playback switch (not shown) is pressed from the stop state shown by the solid line in FIG. 9, the motor 70 moves clockwise in FIG.
2 begins to rotate counterclockwise. The rotation of the motor 7o is transmitted to the cam 72 via the belt 66 and gear 68, but as shown in FIG. 11, even when the motor 7o starts rotating, the sector gear 78 does not start moving immediately. When the rotation angle of the cam 2 exceeds 40 degrees, the cam follower 76 moves to the left in FIG. 10, so the fan-shaped gear 78 rotates counterclockwise in FIG. Gear 4 via °86
6 begins to rotate clockwise in FIG. 9, and gear 48 begins to rotate counterclockwise. Accordingly, the arm 60, which rotates integrally with the gear 46, rotates clockwise in FIG.
6 moves in the direction of the arrow, so in the end, guide post 2
4.26 also moves in the direction of the arrow and pulls out the magnetic tape 18 to the outside of the cassette 12. Similarly, the arm 64, which rotates integrally with the gear 48, rotates counterclockwise in FIG.
Since the drawer block 4o also moves in the direction indicated by the arrow, the guide posts 28 and 30 also move in the direction indicated by the arrow, thereby drawing out the magnetic tape 18 to the outside of the cassette 12.

When the rotation angle of the cam 72 reaches 360°, the guide post)2
4.26 and 28.30 respectively move to the dotted line positions shown in FIG. 9, and the tape pull-out completion switch (not shown) is turned off and the power supply to the τ motor 0 is cut off.

When the tape withdrawal completion switch (not shown) is turned on, the plunger (not shown) operates, and the pinch roller 94 moves from the solid line position to the dotted line position in FIG. 9, the magnetic tape 18 is moved to the right in FIG. 9, and the take-up reel hub 16 winds it up by known means. In this manner, the τ magnetic tape 18 runs along the drum 6o and the fixed head 62, and signals are recorded or reproduced.

When the stop switch (not shown) is pressed, power is cut off to the motor 92 and plunger (not shown), and the capstan 88
stops, and the pinch roller 94 returns to the position shown by the solid line in FIG. The motor 70 rotates counterclockwise in FIG.
The reverse operation to that described above is performed, and the guide post 24.
26 and 28.degree. 30 return to the positions indicated by solid lines in FIG. 9. At this time, the magnetic tape 18 that has been pulled out is stored in the cassette 12 by known means.

Then, when a tape storage completion switch (not shown) is turned off, the rotation of the motor 7o is stopped.

Problems to be Solved by the Invention However, in the above configuration, it is necessary that the gear 4B, which is the first drawer drive member, always meshes with the gear 4B.
The arrangement of the gears 46 and 48 cannot be freely determined, which poses a major constraint on the configuration of each mechanical section. Also, the first
The guide post 24.2 is a magnetic tape pull-out member.
The amount of movement of 6 is always smaller than that of the guide posts 2s and 3o, which are the second magnetic tape pull-out members, by the amount of backlash between gears 46 and 48 (play between tooth surfaces when a pair of gears are meshed). Therefore, there was a problem in that the positioning accuracy at the stop position indicated by the solid line in FIG. 9 deteriorated.

The present invention solves the problems of conventional magnetic tape devices, and enables the stop positioning and movement amount of a pair of magnetic tape pull-out members to be reliably and effortlessly carried out without any variation with a simple structure. It is an object of the present invention to provide a magnetic tape device with fewer restrictions in configuring each part of the device.

Means for Solving the Problems In order to solve the above problems, in the magnetic tape device of the present invention, the first and second drawer drive members do not have a direct engagement relationship with each other, but are embedded in the substrate. The first drawer drive member and the second drawer drive member It is equipped with a rotating member that rotates the two in mutually different directions in forward and reverse directions.

Function: With the above-described configuration, the present invention eliminates the need to directly engage the first and second drawer drive members with each other, and allows them to be placed at any desired position.
Since the first and second drawer drive members are respectively engaged with the same rotating member, there is no difference between the first and second magnetic tape drawer members due to backlash or the like.

EMBODIMENT A magnetic tape device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a back view of a magnetic tape device according to an embodiment of the present invention in a stopped state, FIG. 2 is a back view of essential parts in a stopped state, FIG. 3 is a top view in a stopped state, and FIG. 4 is a recording /
The back view of the reproduction mode, Figure 6 is the back view of the main parts in the recording/reproduction mode, and Figure 8 is the top view of the recording/reproduction mode.
Figure 7 shows the same collision.

FIG. 8 is a perspective view of the main parts on the downstream side, and a sectional view of the main parts of the same embodiment.

In FIGS. 1 to 8, the shaft 4.6 is implanted on the substrate 2.
When the cassette 12 is installed in the main body of the apparatus, the supply reel stand 8 and the take-up reel stand 1o, which are freely rotatably fitted into the cassette 12, are connected to the supply reel hub (not shown), 9 take-up reel hub (not shown), and each other. It has a structure that each unit is connected and rotates as a unit.

A magnetic tape 18 wound on a supply reel hub (not shown) is inserted into a pair of notches 2 provided at the front of the cassette 12.
The take-up reel hub (
(not shown).

The pair of notches 20 and 22 each have guide posts 24 for pulling out and guiding two magnetic tapes.
．． 26 and 28.30 are located. The guide posts 24 , 26 are implanted on the first drawer block 36 that slides while being guided by the first groove 34 on the base plate 2 , and similarly the guide posts 28 , 30 are installed on the first drawer block 36 that slides while being guided by the first groove 34 on the base plate 2 . It is planted on a second drawer block 40 that slides while being guided by a groove 38.

As shown in FIG. 1, a cam 102 having a gear on the outer periphery that is driven by meshing with the output gear of a motor 101 is rotatably fitted into a shaft 100 installed on the back side of the substrate 2. This cam 1.02 has a groove 1 extending over 3600 as shown in the figure.
03, and its lift amount is such that the rotation angle of the cam 102 changes only between 15° and 300°, so the cam follower, which will be described later, moves only in this section. be.

Figures 1 to 3 show the positional relationship in a stopped mode, and a pair of shafts 104 and 106 are installed on the back side of the board 2, and a tenth gear 106 is rotatably attached to the shaft 104. It is loosely fitted. The 20th gear 107 is freely rotatably fitted on the shaft 106, but the 10th gear
The - dewing gear 106 and the 20th - deng gear 107 do not have a direct meshing relationship, but are designed so that they can rotate independently of each other. As shown in FIG. 7, a spring hook 111 provided on the tenth deng arm 110 that is integrated with the boss portion 1o9 that enters the boss portion 108 of the tenth deng gear 106 and is rotatably fitted therein and rotates together with the boss portion 1o9. 10th-
A tension spring 113 is stretched between the pin 112 implanted in the ding gear 106, and the tenth ding arm 110
By bringing the stopper 114 and the pin 112 provided in the
It is configured to be integrated with the dewing gear 106 and rotate together. A tenth drawing link 116 is rotatably coupled to one end of the tenth drawing arm 110 by a pin 116. The other end of the tenth drawing link 116 is engaged with a pin 117 set on the first drawer block 36. The 20th steering arm 118 and the 20th steering gear 1o have the same structure as the structure between the 10th steering arm 110 and the 10th steering gear 106, and enter into the boss portion 120 of the 20th steering gear 107. The boss 12 is rotatably fitted loosely in
20--Ding arm 1 which is integrated with 1 and rotates together with it.
Spring catch 122 provided at 18 and the 20th deng gear 1
By tensioning a tension spring 124 between the pin 123 set on the 20th dinger and the pin 123, and bringing the pin 123 into contact with the stopper 126 provided on the 20th dinger 118, the 20th
- The steering arm 11B and the 20th steering gear 1o are integrated and configured to rotate together. 20th-
A second o-ding link 126 is rotatably coupled to one end of the o-ding arm 118 by a pin 119.

The other end of the 20th leading link 126 is in a mating relationship with a pin 127 set on the second drawer block 4o.

Now, the rotation loft 129 having the cam follower 128 that fits into the groove 103 of the cam 102 has a first gear portion 130 that meshes with the tenth-dewing gear 106 and a twenty-th
It has a second gear part 131 that meshes with the dewing gear 107, and is rotatably supported by a shaft 146 implanted in the substrate 2. In addition, the tenth dewing gear 106
The gear center of the first gear part 130 that meshes with the 20th gear part 107 and the gear center of the second gear part 131 that meshes with the 20th gear 107 are also aligned with the center of the shaft 146, so that the rotating rod 129 is aligned with the shaft 145. Even when rotating around , the tenth deng gear 106 and the twentieth deng gear 107 can be rotated smoothly.

When the device is stopped, the positional relationship is as shown in FIG. 1, and when the cam 102 starts rotating clockwise from the position shown in FIG. 1, the first cam 1600 fits into the groove 103 of the cam 102. Cam follower 128 does not move at all, and therefore pivot rod 129 also remains in the position shown in FIG.

When the rotation angle of the cam 102 reaches 160°, the rotating rod 12
9 begins to rotate clockwise in FIGS. 1 and 2 about axis 146. Therefore, the tenth gear 106 meshing with the first gear part 130 provided on the rotating rod 129 meshes with the second gear part 131 in the counterclockwise direction in FIG. 1 about the shaft 104. The 20th gear 107 begins to rotate clockwise in FIG. 1 about the shaft 106. As a result, the 10th - ding arm 11
0 is counterclockwise in FIG.
18 rotates clockwise, resulting in the first drawer block 36. The second drawer block 40 has a guide groove 34.3
8 in the direction of arrow B in FIG.
8 to the outside of the cassette 12. Continued τ cam 102
When rotates clockwise in FIG. 1, the 10th drawing arm 11o and the 20th drawing arm 118 fix the first drawer block 36 and the second drawer block 40 by the guide posts 24 and 30, respectively. Members 136, 13
Move it to the position where it touches 6.

When the cam 102 further rotates clockwise in FIG. 1 and reaches a rotation angle of 3oo0, the fourth
In the figure, the clockwise rotation stops. Incidentally, FIGS. 4 to 6 show the positional relationships in the recording/reproducing mode. In this state, as described above, the tape guides 24, 30 are in contact with the fixing members 135, 138, and the tenth-dewing arm 110 and the twentieth-dewing arm 118 cannot be rotated beyond the state shown in FIG. As a result, the 10th dewing gear 106 and the 20th deng gear 107
13. 124 is stretched against the biasing force to obtain the positional relationship shown in Fig. 5, and the state shown in Fig. 6 is maintained in the range where the rotation angle of the cam 102 is from 300° to 3600°. .

As described above, when the tenth pointing arm 110 and the twentieth pointing arm 118 are unable to rotate, the first
0-ding gear 106 and 20th-ding gear 107
are rotated counterclockwise and clockwise in FIG. 6, respectively, so a gap of Δe is created between the bottle 112 and the stopper 114, and similarly a gap of Δe' is created between the bottle 123 and the stopper 126. It is occurring. In the end, these gaps Δe and Δe
′ is nothing but the elongation of the tension springs 113, 124, and the guide post 24.30 is pressed against the fixing member 13!5.136 by a force corresponding to this elongation, and the magnetic tape 18 is held in a stable state outside the cassette 12. Fixed head 13 placed in
8,139 and a guide drum 140 having a built-in rotating magnetic head (not shown) 'C6
Ru. At this time, the tension of the tension spring 113 is P, the distance from the shaft 104 to the bottle 112 is r, and the spring tension is 1 from the shaft 104.
If the distance to No. 11 is R, and the biasing torque for rotation in the counterclockwise direction of the No. 10-ding arm 11o in FIG. , 1st
Assuming that the torque required to drive the 0-ding gear 116 once is t, t: P x r , -8-1
1, (2). From equations (1) and (2), T
/l=R/r ・・・・・・・・・
In this example, to obtain (3), τ is r=6. +5+s
, R=10, so by substituting these values into equation (3), we get T/l=1.538...
...obtains the value (4). This means that the desired output T
That is, for the desired torque of the 10th denging arm 110 in the counterclockwise direction in FIG. This shows that only 538 is enough. Similarly, regarding the relationship between the 20th dewing gear 107 and the 20th deng arm 118, the clockwise driving torque of the 20th deng gear 107 in FIG.
- the desired torqueing gear 106 and the twentieth - clockwise torqueing gear 107 in FIG. 6 of the arm 118;
As shown in FIG. 4 of the rotating opening/socket 129 that is driving this, the rotating torque in the clockwise direction can also be reduced. Further, the load on the cam 102 and the motor 101 driving the cam 102 is reduced.

The tension springs 113 and 124 are provided with spiral side walls 141 and 142 integrally with the 10th deng gear 10e and the 20th deng gear 107 so as to be guided in a spiral manner with respect to the shafts 104 and 10S. . As a result, the tension springs 113 and 124 are tensioned without being abnormally deformed, and the predetermined elongation amount Δe is reliably and smoothly achieved.
, Δe' are ensured.

Then, when the rotation angle of cam 1o2 reaches 360°,
When the saute (not shown) is turned off, the motor 101 stops rotating and the cam 102 stops rotating, so that the positional relationships shown in FIGS. 4 and 6 are maintained.

A capstan 143 rotatably disposed on the substrate 2 is rotated clockwise in FIG. 3 by a capstan motor 144 disposed on the back surface of the substrate 2.

The pinch roller 94 is in the position shown in FIG. 3 in the stop mode, and in the recording/reproduction mode, moves to the position shown in FIG. It is arranged such that the sheet is transported toward the winding direction and wound onto a winding reel hub (not shown) by the driving force of the winding reel motor 146.

The operation of the magnetic tape device configured as described above will be explained.

When the record/playback switch (not shown) is pressed from the stop mode shown in FIG. 1, the capstan motor 144 rotates and begins to rotate the τ capstan 143 clockwise in FIG. 3. Further, the motor 101 begins to rotate counterclockwise in the 1° diagram, and this rotation is transmitted to the cam 102.
02 rotates clockwise in FIG. As mentioned above, when the cam 102 starts rotating, the rotating rod 129 does not start moving immediately even after τ, and when the rotation angle of the cam 102 exceeds 1600 degrees, the cam follower 128 moves toward the axis 1oo, so the rotating rod 129 does not start moving immediately. 129 uses the shaft 146 as a fulcrum and moves clockwise in FIG.
The 10th gear 106 is rotated counterclockwise in FIG. Therefore, the tenth-dewing arm 110 is rotated counterclockwise in FIG.
Since the first drawer block 36 connected to τ moves in the direction of arrow B along the first groove 34, the guide post 24.26 also moves in the direction of arrow B, and the magnetic tape 18 is pulled out of the cassette 12. Pull it out. Similarly, the 20th-
The ding arm 118 is rotated clockwise in FIG.
Since the second drawer block 4o connected to the cassette 12 moves along the second groove 38 in the direction of arrow B, the guide post 28. Pull it outside. At this time, since the lift curve of the groove 103 in which the cam follower 128 fits can be freely selected, the timing, speed, and acceleration of the movement of the rotating rod 129 can be set arbitrarily, and the magnetic tape 18 can be moved smoothly and quickly. It can be drawn out. In addition, since the 10th deng gear 106 and the 20th deg gear 107 are each meshed with the rotation rod 129, the number of times the gears mesh with each other is as small as once, and the number of times is the same. There is no relative variation in the amount of movement of the first drawer block 3e and the second drawer block 4o due to the bunker, and the error in the absolute amount of movement is also reduced.

When the rotation angle of cam 102 reaches 300 degrees, guide posts 20.24 and 28.30 each move to the position shown in FIG. 6. Furthermore, the cam 1020 rotation angle is 3600
When the tape withdrawal completion switch (not shown) is turned off, the power supply to the motor 1o1 is cut off and the cam 10 is turned off.
2 stops rotating, and the positional relationship shown in FIG. 4 is maintained. At this time, since the tension springs 113 and 124 are stretched as described above, the guide pins 24 and 30
The motor 10 when crimping the fixing members 135 and 136
The load on 1 is reduced. In addition, the above-mentioned section (
If the value of H is further increased and the value of r is further decreased in equation 3), the load applied to the cam 102, that is, the motor 1o
The load on the motor 1 can be further reduced, and even a motor with a small output can perform a sufficiently reliable loading operation, and since the load is small, power consumption can also be saved. Furthermore, it is clear that if the pressure angle of the groove 103 of the cam 102 with respect to the cam follower 12B is made as small as possible, the guide pin 24, 30 can be crimped onto the fixing member 136° 136 with less force.

When the rotation angle of the cam 102 reaches 360°, the pinch low 29
4 moves from the position shown in FIG. 3 to the position shown in FIG.
8 to the right in FIG. 6, the take-up reel hub (not shown) receives the driving force of the take-up side reel motor 14θ and winds it up without slack. In this manner, the magnetic tape 18 runs along the guide drum f40 and the fixed heads 138, 139, and signals are recorded or reproduced. As mentioned above, since the rotating rod 129 is intermittently driven by the cam 102, the output can be increased by providing a groove different from the groove 103 in the τ cam 102 by utilizing the section where the guide posts 24, 26 and 28, 30 do not move. It can also be taken out to drive other mechanisms, such as the pinch roller 94. If a stop switch (not shown) is then pressed, the capstan motor 144 is de-energized and the capstan 143 stops. , the pinch roller 94 is returned to the position shown in FIG. 3 by known means. The motor 101 is the fourth
The reverse operation is performed by rotating clockwise in the figure and cam 102 counterclockwise in FIG. 4 to return guide posts 24.28 and 28.30 to the position shown in FIG. do. At this time, the magnetic reel hub (not shown) that had been pulled out is wound without slack.

Thereafter, when the cam 102 rotates to a rotation angle of 0°, a switch (not shown) is operated to stop the rotation of the motor 1o1, resulting in the stopped state shown in FIG. 1.

Here, the shaft 146 which is the rotation center of the rotation rod 129, the gear center of the first gear part 130, and the gear center of the second gear part 13
As long as the center of gear 1 is aligned! By freely combining the ratio of the number of teeth between the first gear section and the tenth gear 106 and the ratio of the number of teeth between the second gear section 131 and the twentieth gear 107, the first drawer block 36 and the tenth gear 107 can be freely combined. Since the movement strokes of the two drawer blocks 4o can be set freely, the tenth drawing gear 1o6. The arrangement of the 20th deng gear 107 is not limited to the positional relationship shown in FIG. Also, the 10th-
The distance between the dewing gear 106 and the 20th deg gear 107 may be further apart or may be closer to each other. In this case, the positional relationship of the first gear part 130 and the second gear part 131 with respect to the rotating rod 129 is shifted, and the tenth gear part 106. What is necessary is to mesh with the second a-ding gear 107.

Therefore, since the rotation radius of the rotation loft 129 can be freely set, the arrangement of the cam 102 can also be arbitrarily selected. In this embodiment, the cam 102 is connected to the guide drum 140 in FIG.
The rotating rod 129 is arranged on the left side of the guide drum 140, and the rotating rod 129 rotates by τ around the shaft 146. However, the cam j02 can be placed on the right side of the guide drum 140, on the supply reel stand 8, or on the It may also be placed on the side of the reel stand 10.

In particular, in this embodiment, the cam 102 is located on the left side of the guide drum 104 in FIG.
The cam 102, the guide drum 140, the capstan motor 144, the supply reel motor 146, and the take-up reel motor 148 are placed at the optimal position on the back surface of the substrate 2, above the 44, so that they can be arranged in a flat manner, so that the entire device is A significant reduction in thickness has been achieved.

Effects of the Invention As described above, the present invention allows the first drawer block to be rotated in one direction from the first position for drawing out the magnetic tape to the second position for drawing the magnetic tape out of the cassette and throat and attaching it to the magnetic head. a tenth gear driven to a first gear;
a second drawer block for driving the second drawer block from the first position to the second position with rotation in the opposite direction to the 0-ding gear;
It is rotatably supported by a 0-ding gear, a board, and a support shaft embedded in this board, and engages with the 10th-ding gear and the 20th-ding gear, respectively, for forward and reverse rotation. By moving, the 10th-ding gear and the 20th
- By providing a rotary rod that rotates the loading gear in forward and reverse directions in mutually different directions, the magnetic tape can be pulled out and stored with an extremely simple structure.

Furthermore, since the two drawer drive members that drive the magnetic tape drawer members can be freely arranged, this has the excellent effect that the degree of freedom in terms of the mechanical structure of the apparatus is extremely high.

Furthermore, since each of the two drawer drive members only needs to be engaged with the drive source once, it also has the effect of reducing errors in the amount of drive of the magnetic tape drawer member caused by Pa-Sokura-Noshi, etc. .

[Brief explanation of drawings]

1 is a back view of a magnetic tape device according to an embodiment of the present invention in a stopped state, FIG. 2 is a back view of essential parts in a stopped state, FIG. 3 is a top view in a stopped state, and FIG. 4 is a recording/recording/
5 is a back view of the main part in the recording/reproducing mode, FIG. 6 is a top view in the recording/reproducing mode, FIG. 7 is a perspective view of the main part of the same example, and FIG. 8 is the same. 9 is a top view of a conventional magnetic tape device, FIG. 10 is a rear view of FIG. 9, and FIG. 11 is a lift curve diagram of a cam used in a conventional magnetic tape device. be. 2... Board, 12... Cassette, 18
...magnetic tape, 24, 26.28.30...
...Guide post, 36...First drawer block, 4o...Second drawer block, 108
・・・・・・10th deing gear, 107・・・・・・
20th-Ding gear, 129...Rotation opening/hood, 130. ...First gear section, 131...
...Second gear part, 146...shaft. Name of agent: Patent attorney Toshio Nakao and one other person No. 9
Figure 10 Figure 11

Claims (1)

[Claims] Pulling the magnetic tape out of the cassette from a cassette containing a pair of reel hubs for winding the magnetic tape,
A magnetic tape device of a type that records or reproduces signals by running a magnetic head installed outside a cassette to record or reproduce a signal, wherein a first
first and second magnetic tape pull-out members that reciprocate between a position and a second position where the magnetic tape is pulled out of the cassette and attached to the magnetic head; a first drawer drive member that drives the tape drawer member from the first position to the second position; and a second magnetic tape drawer member that rotates in the opposite direction to the first drawer drive member; a second drawer drive member that is driven from the first position to the second position; a substrate; and a second drawer drive member rotatably supported by a support shaft implanted in the substrate, and the first and second drawer drives; a reciprocating member that rotates the first drawer driving member and the second drawer driving member forward and backward in mutually different directions by engaging with the respective members and rotating forward and backward, and this rotating member; to move the first and second magnetic tape pull-out members from the first position to the second position by rotating in one direction and moving the first and second magnetic tape pull-out members from the first position to the second position by rotating in the other direction. A magnetic tape device comprising: a motor capable of forward and reverse rotation for driving the magnetic tape device from the second position to the first position.