JP3277627B2 - Reel drive switching mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive switching mechanism provided in, for example, a running section of a tape in a video reproducing (re-recording) apparatus.

[0002]

2. Description of the Related Art In a cassette half of a video tape or a cassette tape, two reels, a feed side and a take-up side, are accommodated, and the tape is wound around these reels. Also, a video reproducing (re-recording) apparatus, a cassette player, a cassette recorder and the like are provided with a tape running section for loading the cassette half. In the tape running unit,
In addition to a head that slides on the running tape and reproduces or rerecords signals from the tape, a head is provided. A capstan shaft and a pinch roller that rotate while holding the tape are provided.

The reel stand on the downstream side in the running direction of the tape is driven to rotate by a capstan motor, whereby the tape is wound. The capstan shaft is driven to rotate by the capstan motor, and the capstan shaft and the pinch roller keep the running speed of the tape slidably in contact with the head constant.

In the power transmission path between the reel stand and the capstan motor, a swing gear for selectively transmitting the power from the capstan motor to the reel stand on the downstream side in the running direction is provided. Is provided. The swinging gear is supported by an arm that is swingably arranged between the two reel stands, and the swinging of the arm causes the swinging gear to mesh with a rotation gear of one of the reel stands. And a position at which it meshes with the rotation gear of the other reel base.

Conventionally, when the tape is shifted from the reproducing and fast-forwarding state to the rewinding state or vice versa, the arm is swung by the capstan motor to swing the head. While switching the rotating gear with which the gear meshes from one reel base to the other reel base and swinging the arm, the pinch roller is once separated from the capstan shaft, and after swinging, the pinch roller is moved. Again, the capstan shaft was pressed against the shaft.

[0006]

However, as described above, conventionally, the pinch roller is once separated from the capstan shaft while the arm is oscillated. When the tape is pressed against the stun shaft to resume the running of the tape, there is a problem that the running of the tape is likely to be unstable, and
There was a problem that the tape was easily damaged due to the unstable running. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to prevent the tape from running when the moving gear is moved and the reel base on which the moving gear meshes is switched to restart the running of the tape. It is an object of the present invention to provide a reel drive switching mechanism that can prevent the tape from becoming stable, thereby preventing the tape from being damaged.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a pair of reel bases engaged with a tape reel, and a rotating gear fixed to each of the pair of reel bases. A moving gear movably disposed between a position meshed with the rotating gear of the reel base and a position meshed with the rotating gear of the other reel base, and a first drive source for rotating the moving gear And the power of the first drive source is
Rotating means having a rotating power transmission mechanism for transmitting to the
A reel drive switching mechanism comprising: a moving unit having a second drive source for moving the moving gear;
The stage transmits power of the second drive source to the moving gear.
Moving power transmission mechanism, and the first
Features of stops the drive source, said movable gear with said rotating means by moving the movable gear at the moving unit is form so as to generate a rotational force in the direction opposite to the direction of rotation which has been rotated And

Further, according to the present invention, the moving power transmission mechanism includes an arm arranged to be swingable between the pair of reel stands, and the moving gear is rotatably supported by the arm. It was assumed. Further, in the present invention, the power transmission mechanism for rotation includes a relay gear that is rotated by the first drive source and meshes with the moving gear, and the power transmission mechanism for movement includes the relay gear. It was assumed. Further, according to the present invention, the pair of reel bases is disposed on a second chassis which is disposed so as to be able to move up and down with respect to the first chassis, and the second drive source is a motor which moves up and down the second chassis. .

[0009]

According to the present invention, the a separately moving drive source gear for moving a drive source for rotating the movable gear, the position for meshing with the moving gear to the reel stand rotation gear of said both It is not necessary to separate the pinch roller from the capstan shaft rotated by the driving source for rotating the moving gear when moving between the rotating gears.
A state that generates a rotational force in the direction opposite to the biting direction on the
It is necessary to simply stop the driving source for rotating the moving gear while keeping the pinch roller pressed against the capstan shaft, and the moving gear moves smoothly.
Done. Therefore, when the moving gear is moved, the pinch roller is separated from the capstan shaft, and after the moving gear is moved, the pinch roller is again pressed against the capstan shaft. It is possible to prevent the tape from being damaged by the unstable running.

Further, according to the present invention, the moving power transmission mechanism includes an arm arranged to be swingable between the pair of reel stands, and the moving gear is rotatably supported by the arm. With this configuration, the conventional swing arm can be used as it is. Further, according to the present invention, the relay gear meshing with the moving gear is shared by the rotation power transmission mechanism and the movement power transmission mechanism, and the movement gear meshes with the rotation gear of one of the reel stands. The relay gear may be driven by the driving source for rotating the moving gear when the moving gear is being moved, and the relay gear may be driven by the driving source for moving the moving gear when moving the moving gear. Further, according to the present invention, the driving source for moving the moving gear is a lifting / lowering motor of a second chassis capable of moving up and down provided with the pair of reel stands, so that the number of parts is increased without increasing the number of parts. The moving gear can be moved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a tape traveling drive unit of a video reproducing / recording apparatus provided with a reel drive switching mechanism according to a first embodiment of the present invention. Chassis 11 (corresponding to the first chassis)
And a linear skate chassis 13 (equivalent to a second chassis) having a concave shape in a plan view, which is disposed above the mechanical chassis 11 and which moves up and down in accordance with loading and unloading of the video cassette from the video reproducing and recording apparatus. Have.

At the rear left and right of the linear skate chassis 13, there are rotatably disposed a feed reel base 15 and a take-up reel base 17 which respectively engage and disengage a feed reel and a take-up reel (not shown) of the video cassette. 2 and FIG. 3, as shown in the side view of FIG.
And rotation gears 1501 and 17 of the take-up reel base 17
01 is arranged above the linear skate chassis 13. At the center of the front of the mechanical chassis 11, a re-recording head 19 protrudes obliquely from below the mechanical chassis 11, and at the left of the front is a loading motor 21 for lifting and lowering the linear skate chassis 13. (Corresponding to a driving source for moving the moving gear), a capstan motor 23 for moving the video tape (corresponding to a driving source for rotating the moving gear), a capstan shaft 25, and a pinch roller 27 are provided on the front right side. And the like, and the mechanical chassis 1
1 is provided with a reel drive switching mechanism 29 of the present embodiment.

The reel drive switching mechanism 29 is disposed in the right half of the mechanical chassis 11 and rotates the power of the capstan shaft 25 with the rotation gear 1501 of the feed-side reel base 15 or the take-up reel base 17. , 1701 side, and the power transmission mechanism 31 transmits the power from the power transmission mechanism 31 to the rotation gears 1501, 1701 of the feed-side reel base 15 or the take-up reel base 17. Gear 33 (equivalent to a moving gear)
Disposed from the left half to the lower right of the mechanical chassis 11, and the swing gear 33 is connected to the rotation gear 1501 of the feed-side reel base 15 and the rotation gear 1701 of the take-up reel base 17. And a swing mechanism 35 (corresponding to a moving power transmission mechanism) for swinging between them.

As shown in a plan view in FIG. 4, the power transmission mechanism 31 includes an output gear 3101 attached to the capstan shaft 25, a conversion gear 3103 meshing with the output gear 3101, and the conversion gear 3103. A pulley 3105 provided coaxially with 3103 and rotating integrally therewith; a relay pulley 3107 provided near the rotation gear 1701 of the take-up reel base 17;
7 and the relay pulley 3
A first gear 3111 provided coaxially with 107 and rotating integrally therewith; a second gear 3113 meshing with the first gear 3111; and a third gear 3 meshing with the second gear 3113
115 and a fourth gear 3117 provided coaxially with the third gear 3115 and rotating integrally therewith (corresponding to a relay gear)
The swing gear 33 meshes with the fourth gear 3117. In the figure, reference numeral 37 denotes a tension pulley, and 39 denotes a video tape.

The second gear 3113 is connected to the first swing arm 3.
It is pivotally supported by 501. The first swing arm 3501
Is shown in a side view in FIG. 5 and a plan view in FIG.
The third gear 3115 is disposed between the linear skate chassis 13 and the mechanical chassis 11 and an intermediate portion thereof is disposed between the linear skate chassis 13 and the mechanical chassis 11.
The second gear 3113 is swingably supported coaxially with the second gear 3113.
Is pivotally supported by the front end of the first swing arm 3501, the rear end of the first swing arm 3501 extends to the rear side of the mechanical chassis 11, and an engagement pin 3503 protrudes from the end. .

The swing gear 33 includes a second swing arm 35.
05 (corresponding to an arm). The second swing arm 3505 is disposed on the upper surface side of the linear skate chassis 13 as shown in FIGS. 5 and 6, and its rear end swings coaxially with the third and fourth gears 3115 and 3117. Movably supported, and the front end thereof
Is supported. The swinging gear 33 has a concave portion 3301 formed at the bottom thereof, as shown partially cut away in FIG. 5, in which a resistance is generated when the swinging gear 33 rotates. A spring plate 3303 is in elastic contact with the spring. As shown in enlarged plan views of the oscillating gear 33 and its peripheral portion in FIGS. 7 and 8, the oscillating gear 33 swings the second oscillating arm 3505 so that the feed-side reel base 15 is moved. Rotating gear and take-up reel base 17
Are arranged so as to be selectively meshed with the rotation gear.

The swing mechanism 35 includes the first and second swing arms 3501 and 3505, and a worm 3507 attached to the shaft of the loading motor 21 as shown in a plan view in FIG. A worm gear 3509 meshing with the worm 3507; a fifth gear 3511 formed on the shaft of the worm gear 3509;
A sixth gear 3513 meshing with the first gear 3513;
7th gear 35 provided coaxially with and rotating integrally therewith
15, a gear train 3517 for power transmission connected to the seventh gear 3515, a disk 3521 provided coaxially with a gear 3519 on the downstream end side of the gear train 3517 and rotating integrally therewith, A gear 3519, a disk 3521, and a slide arm 3523 at the downstream end of the gear train 3517 are further provided on the rear right side of the mechanical chassis 11.

A cam groove 35 is provided on the outer periphery of the disk 3521.
25 are formed. The cam groove 3525 includes a first cam portion 3527 formed in an arc shape with a predetermined diameter centered on the center of the disk 3521, and the first cam portion 3527.
And a second cam portion 3529 extending a predetermined length at a position closer to the center than the first cam portion 3527. The slide arm 35
Reference numeral 23 extends leftward and rightward on the disk 3521, and a long slot 3531 is formed in two places on the slide arm 3523 spaced apart in the left-right direction. Each of the slots 3531 is provided with the mechanical chassis 1.
The tip of a support pin 1101 protruded from the slide arm 35 is fitted by the support pin 1101.
Reference numeral 23 is slidably supported left and right.

The left end of the slide arm 3523 is provided with an engagement pin 3503 of the first swing arm 3501.
And a cam pin 3535 which engages with the cam groove 3525 of the disk 3521 at a position slightly closer to the left end than the center of the slide arm 3523.
Is protruding. When the cam pin 3535 is engaged with the first cam portion 3527, the slide arm 3523 is slid to the right, and when the cam pin 3535 is engaged with the second cam portion, the slide arm 3523 is moved to the left. Slided.

Next, the operation will be described. First, at the time of reproducing and fast-forwarding the video tape 39, as shown in FIG. 7, the gear 3519 on the downstream end side of the gear train 3517 is rotated clockwise by the loading motor 21, and the slide arm The cam pin 3535 of 3523 is engaged with the first cam portion 3527, and the slide arm 3523 is slid to the left.
Therefore, the engagement recess 3533 and the engagement pin 350
3, the first swing arm 3501 is rotated clockwise about the axis of the third gear 3115, and the second swing arm 3501 is pivotally supported by the first swing arm 3501.
The axis of the gear 3113 is located on the right side of a line CL connecting the axes of the first and third gears 3111 and 3115 meshing with the second gear 3113. Further, the second swing arm 3
Reference numeral 505 denotes a rotating gear side 17 of the winding side reel base 17.
01, and the swinging gear 33 is meshed with the rotating gear side 1701 of the take-up reel base 17.

Therefore, at the time of reproducing and fast-forwarding the video tape 39, the capstan shaft 25 and the output gear 3101 are rotated counterclockwise by the capstan motor 23, and the conversion gear 3103 and the pulley 310 are rotated.
5. The relay pulley 3107 and the first gear 3111 are rotated clockwise, the second gear 3113 is rotated counterclockwise, and the third gear 3115 and the fourth gear 3117 are rotated clockwise. , The fourth gear 311
By the rotation of 7, a force for rotating the swinging gear 33 in a counterclockwise direction acts. The swinging gear 33 is used as the rotating gear 1 of the take-up reel base 17.
701, the swinging gear 33 is rotated in the counterclockwise direction against the regulation of the spring plate 3303, and the rotation gear 170 of the take-up reel base 17 is rotated.
1 is rotated clockwise, and the take-up side reel base 17 is rotated.
The take-up reel of the video cassette engaged with the video cassette is rotated clockwise. The meshing state of the swinging gear 33 with the rotating gear 1701 is determined by the swinging gear 33.
The clockwise frictional force generated between the spring plate 3303 and the oscillating gear 33 when the is rotated against the regulation of the spring plate 3303 acts on the second swing arm 3505, The swing arm 3505 is connected to the rotation gear 1701.
It is maintained by biasing in the direction.

In reproducing and fast-forwarding the video tape 39, the pinch roller 27 is pressed against the capstan shaft 25, and the
The video tape 39 is fed out in the playback (fast-forward) direction by the rotation of the capstan shaft 25 in the counterclockwise direction. Therefore, the video tape 39 is reproduced (fast-forward) by feeding the video tape 39 by the capstan shaft 25 and the pinch roller 27 and rotating the take-up reel of the video cassette in the clockwise direction.
It is driven in the direction. In this case, the feed side reel base 15
Since the swing gear 33 is not meshed with the rotation gear 1501, the feed-side reel base 15 is rotated clockwise by the rotation of the take-up reel base 17 via the video tape 39. You.

Next, the case where the video tape 39 shifts from the reproduction and fast-forward state to the rewind state will be described.
In this case, first, with the pinch roller 27 pressed against the capstan shaft 25, the rotation of the capstan motor 23 is locked, and the capstan shaft 25,
Output gear 3101, conversion gear 3103, pulley 310
5. The relay pulley 3107 and the first gear 3111 are locked. Then, the loading motor 21 is driven, and as shown in FIG. 8, the gear 3519 on the downstream end side of the gear train 3517 is rotated in a counterclockwise direction, and accordingly, the cam pin 353 of the slide arm 3523 is rotated.
5 is engaged with the second cam portion 3529 from the bent portion, and the slide arm 3523 is slid to the right.

Then, the engagement between the engagement recess 3533 and the engagement pin 3503 causes the first swing arm 350 to rotate.
1 is rotated counterclockwise about the axis of the third gear 3115, and the axis CD of the second gear 3113 supported by the first swing arm 3501 meshes with the second gear 3113. The shafts of the first and third gears 3111 and 3115 are connected.
Is located on the left side than on the department line CL, the first gear 3111
Is locked, the first swing arm 35
The swing of 01 causes the second gear 3113 to rotate clockwise. As a result, the first gear 3111 and the second gear
Based on the backlash existing between 3113, the watch
The rotation in the circumferential direction causes the axis CD of the second gear 3113 to rotate.
Moves counterclockwise. Thereby, the third gear 3
115 and the fourth gear 3117 are rotated in the counterclockwise direction. Therefore, the rotation of the fourth gear 3117 exerts a force to rotate the swinging gear 33 in the clockwise direction .

[0025] However, since the rotation of the oscillating gear 33 is restricted by the spring plate 3303, the oscillating gear
33 is applied to the second swing arm 3505, thereby causing the second swing arm 3505 to rotate.
The swing arm 3505 is swung in the counterclockwise direction, and the swinging gear 33 is meshed with the rotation gear 1501 of the feed side reel base 15. This state is shown in FIG. In this state, the lock of the capstan motor 23 is released, and when the video tape 39 is played back and fast-forwarded,
The capstan shaft 25 is driven by the capstan motor 23.
The output gear 3101 is rotated clockwise, and the conversion gear 3103, the pulley 3105, the relay pulley 310
7, the first gear 3111 is rotated counterclockwise, the second gear 3113 is rotated clockwise,
The third gear 3115 and the fourth gear 3117 are rotated in the counterclockwise direction, and the rotation of the fourth gear 3117 exerts a force to rotate the swinging gear 33 in the clockwise direction.

At this time, since the swinging gear 33 is engaged with the rotating gear 1501 of the feed side reel base 15, the swinging gear 33 is connected to the spring plate 3303.
Of the video cassette, which is rotated in the clockwise direction against the restriction described above, and the rotation gear 1501 of the feed side reel base 15 is rotated in the counterclockwise direction, and the feed of the video cassette engaged with the feed side reel base 15 is performed. The reel is rotated counterclockwise. The meshing state of the oscillating gear 33 with the rotating gear is determined when the oscillating gear 33 is rotated against the regulation of the spring plate 3303.
The counterclockwise frictional force generated between the second arm 3505 acts on the second swing arm 3505, and is maintained by urging the second swing arm 3505 toward the rotation gear 1501.

When the video tape 39 is rewound, the pinch roller 27 is attached to the capstan shaft 25.
Are pressed against each other, and the video tape 39 is held therebetween. By rotating the capstan shaft 25 in the clockwise direction, the video tape 39 is sent out in the rewinding direction. Accordingly, the video tape 39 is moved in the rewinding direction by the feeding of the video tape 39 by the capstan shaft 25 and the pinch roller 27 and the clockwise rotation of the take-up reel of the video cassette. in this case,
Since the swinging gear 33 is not meshed with the rotation gear 1701 of the take-up reel base 17, the take-up reel base 17 is driven by the rotation of the feed-side reel base 15 via the video tape 39. And rotated counterclockwise.
When the video tape 39 shifts from the rewind state to the reproduction and fast-forward state, the operation opposite to the above is performed.

As described above, according to the present embodiment, the swinging gear 33 rotated by the power transmission mechanism 31 is brought into contact with the rotation gear 1501 of the feed-side reel base 15 and the take-up reel base 17. The swinging gear 33 meshes with the rotation gear 1701 of the take-up reel base 17 when the video tape 39 is reproduced and when the video tape 39 is fast-forwarded. When the video tape 39 is rewound, the swing gear 33 swings to a position where the swing gear 33 meshes with the rotation gear 1501 of the feed-side reel base 15. Capstan motor 23 of the power transmission mechanism 31
Instead, the loading motor 21 moves the linear skate chassis 13 up and down.

Therefore, when the video tape 39 is shifted from the playback and fast-forward state to the rewind state or vice versa, when the video tape 39 stops running, the video tape 39 has been pressed against the capstan shaft 25 until then. It is not necessary to separate the pinch roller 27 from the capstan shaft 25. For this reason, the pinch roller 27 is again pressed against the capstan shaft 25 to resume running, and
9 can be prevented from becoming unstable, and the conventional trouble that the video tape 39 is easily damaged due to the unstable running can be prevented.

Also, since the drive source for running the video tape 39 and the drive source for swinging the swing gear 33 are different,
A mechanism for swinging the swinging gear 33 and its operation can be simplified, and the time required for shifting the video tape 39 from the playback and fast-forward state to the rewind state or vice versa can be shortened. Can be made possible. Further, in the present embodiment, the loading motor 21 is also used as a drive source for swinging the swing gear 33, so that the above-described effects can be achieved without increasing the number of components. In the present embodiment, the power transmission mechanism 31 and the swing gear 33
Since the swing mechanism 35 is separate from the swing mechanism 35, the degree of freedom in designing the swing mechanism 35 and the swinging gear 33 is increased, and the size of the mechanism can be reduced. Further, in this embodiment, the above-mentioned effect can be achieved by using the arm for supporting the swinging gear 33 provided in the conventional reel drive switching mechanism as it is.

Next, a reel drive switching mechanism according to a second embodiment of the present invention will be described. In the second embodiment, the driving method of the third and fourth gears 3115 and 3117 is different from that of the first embodiment. That is, the eighth gear meshing with the swing gear 33
A gear 3119 (corresponding to a relay gear);
9 is provided integrally with a second relay pulley 3121 on which the hook 9 is mounted. The swing gear 33 is supported by the second swing arm 3505 which is supported by the eighth gear 3119, as in the first embodiment. In this embodiment, as shown in the schematic views of FIGS. 10A and 10B, the belt 3109 has some slack, and the two tension members are opposed to each other with the belt 3109 interposed therebetween. A pulley 3537 is rotatably disposed on a third swing arm 3539, and the third swing arm 3539 is swung by the loading motor 21 so that the two tension pulleys
One of the belts 537 is pressed against the outer periphery of the belt 3109, whereby the second relay pulley 3121 and the eighth gear 3119 are rotated.

More specifically, the third swing arm 3539 is swung by the loading motor 21 in a state where the rotation of the capstan motor 23 is locked, and as shown in FIG. When the tension pulley 3537 is pressed against the outer periphery of the belt 3109, the belt 31 of the left tension pulley 3537 is pressed.
The belt 3109 is pulled back from the second relay pulley 3121 by the movement of the belt 3109 in a direction substantially orthogonal to the extending direction of 09, whereby the second relay pulley 3121 is rotated clockwise. Further, the capstan motor 2
The third swing arm 3539 is swung by the loading motor 21 in a state where the rotation of the third pulley 3 is locked, and as shown in FIG.
When the belt 37 is pressed against the outer periphery of the belt 3109, the right tension pulley 3537 moves in a direction substantially orthogonal to the extending direction of the belt 3109, thereby causing the belt 31 to move.
09 is pulled back from the second relay pulley 3121, whereby the second relay pulley 3121 is rotated in the counterclockwise direction. As described above, in the second embodiment, the belt 3109 is used to rotate the second relay pulley 3121 and the eighth gear 3119 in the normal and reverse directions, and the second swing arm 35
05, the swinging gear 33 is connected to the sending reel base 1.
5 and a position where it meshes with the rotation gear 1701 of the take-up reel base 17. According to the second embodiment, the same effect as that of the first embodiment can be obtained.

Next, a reel drive switching mechanism according to a third embodiment of the present invention will be described. In the third embodiment, the driving method of the third and fourth gears 3115 and 3117 is different from the first and second embodiments. That is, as shown in the main part enlarged sectional view of FIG. 11, a ninth gear 3123 (corresponding to a relay gear) meshed with the swinging gear 33 and pivotally supported by the second swing arm 3505, and 10th smaller diameter than 3123
A gear 3125 is integrally provided, and a third relay pulley 3127 on which the belt 3109 is mounted is rotatably provided coaxially with the ninth and tenth gears 3123, 3125. The third relay pulley 3127 is provided with an internal gear 3129, and meshes with the internal gear 3129 and the tenth gear 3125 to form two planetary gears 3129.
The planet gear 3541 is supported by a support arm 3543, and the support arm 3543 is swung by the loading motor 21.

According to the third embodiment, when the support arm 3543 is swung by the loading motor 21 while the rotation of the capstan motor 23 is locked, the capstan motor 23 locks the rotation. Since the belt 3109 to the third relay pulley 3125 are not rotated, the two planetary gears 3541 rotate forward and reverse, and the tenth gear 3125 meshing with the two planetary gears 3541 rotates forward and reverse. Specifically, at the time of playback and fast-forward of the video tape 39, as shown in an enlarged bottom view of a main part in FIG. 12, a support arm 3543 (shown by an imaginary line in FIG. 12).
Are pivoted counterclockwise, whereby the two planetary gears 3541 are rotated clockwise, and the first
The 0 gear 3125 is rotated counterclockwise. Also,
When the video tape 39 is rewound, the support arm 3543 (indicated by an imaginary line in FIG. 13) is swung clockwise as shown in FIG. One planetary gear 3541 is rotated counterclockwise, and the tenth gear 3125 is rotated clockwise.

As described above, by swinging the support arm 3543, the tenth and ninth gears 3125, 3125
123 is rotated forward and reverse, whereby the swinging gear 33 meshes with the rotation gear 1501 of the feed-side reel base 15 via the second swing arm 3505, and the rotation of the take-up reel base 17 And swings between a position where the gear 1701 meshes with the gear 1701. According to the third embodiment, the same effects as those of the first and second embodiments can be obtained.

Next, a description will be given of a reel drive switching mechanism according to a fourth embodiment of the present invention. In the fourth embodiment, the driving method of the third and fourth gears 3115 and 3117 is different from the first to third embodiments. That is, as shown in the main part enlarged sectional view of FIG. 14, an eleventh gear 3131 (corresponding to a relay gear) meshing with the swing gear 33 and pivotally supporting the second swing arm 3505; A first bevel gear 3133 integrally provided below the lower part 3131;
09, a second bevel gear 3137 provided integrally with the fourth relay pulley 3135 and facing the first bevel gear 3133, and the first and second bevel gears 3rd meshing with 3133, 3137
A third bevel gear 3545 is provided;
Are normally and reversely rotated by the loading motor 21.

According to the fourth embodiment, when the rotation of the capstan motor 23 is locked and the third bevel gear 3545 is rotated forward and backward by the loading motor 21, the lock of the capstan motor 23 is locked. As a result, the belt 3109, the fourth relay pulley 3135, and the second bevel gear 3137 are not rotated, so that the first bevel gear 3133 is normally and reversely rotated, whereby the eleventh gear 3131 is normally and reversely rotated. In this way, by rotating the third bevel gear 3545 in the normal or reverse direction, the first
The first gear 3131 is rotated forward and reverse, whereby the swinging gear 33 is engaged with the rotation gear 1501 of the feed reel base 15 via the second swing arm 3505, and the take-up reel base 17 is rotated. In a position meshing with the rotary gear 1701. According to the fourth embodiment, the same effects as those of the first to third embodiments can be obtained.

Next, a description will be given of a reel drive switching mechanism according to a fifth embodiment of the present invention. In the fifth embodiment, the driving method of the third and fourth gears 3115 and 3117 is different from the first to fourth embodiments. That is, as shown in a main part enlarged sectional view of FIG. 15, a twelfth gear 3139 (corresponding to a relay gear) meshed with the swinging gear 33 and pivotally supported by the second swing arm 3505, and the belt 3109 A fifth gear mounted and rotatably provided coaxially with the twelfth gear 3139;
A relay pulley 3141, a large-diameter thirteenth gear 3143 provided integrally with the fifth relay pulley 3141, and are coaxially supported by the twelfth and thirteenth gears 3139 and 3143 and the fifth relay pulley 3141. The second support arm 3
547 and fourteenth and fifteenth gears 35 51 , 35 49 rotatably supported by the second support arm 3547 and integrally formed with each other. Then, the first 12 and meshed with the gear 3139 and the fourteenth gear 35 51, the first 13 wherein the gear 3143 15th gear 35 49
Meshes and the second support arm 354 7 is swung by the loading motor 21.

According to the fifth embodiment, when the rotation of the capstan motor 23 is locked and the second support arm 3547 is swung by the loading motor 21, the locking of the capstan motor 23 is stopped. Because the belt 3109, the fifth relay pulley 3141, and the thirteenth gear 3143 are not rotated, the fifteenth gear 3549 is rotated forward and reverse, and the first gear 3549 is integrally rotated with the first gear.
The 4th gear 3551 is rotated forward and reverse, and the first
The second gear 3139 is rotated forward and backward. Specifically, at the time of playback and fast-forward of the video tape 39, the second support arm 3547 (shown by an imaginary line in FIG. 16) is swung clockwise, as shown in the enlarged bottom view of the main part in FIG. Thereby, the fourteenth and table 15 gears 3551, 354
9 is rotated clockwise , and the twelfth gear 3139 is rotated.
Is rotated counterclockwise. Video tape 3
At the time of rewinding of No. 9, the second support arm 3547 (indicated by an imaginary line in FIG. 17) is swung in a counterclockwise direction, as shown in an enlarged bottom view of FIG.
The 14th and 15th gears 3551 and 3549 are rotated in the counterclockwise direction, and the twelfth gear 3139 is rotated in the clockwise direction.

As described above, the second support arm 3547
The fifteenth and fourteenth gears 354
9, 3551, whereby the swing gear 33 meshes with the rotation gear 1501 of the feed side reel base 15 via the second swing arm 3505;
It is configured to swing between a position where the take-up reel base 17 meshes with the rotation gear 1701. According to the fifth embodiment, the same effects as those of the first to fourth embodiments can be obtained.

In each of the embodiments described above, the swing gear 3
Although the swinging motion of 3 is performed by the loading motor 21, it may be performed by another motor other than the capstan motor 23, or may be performed by a dedicated motor. Further, in each of the above-described embodiments, the swing mechanism 35 of the swinging gear 33 is constituted by a gear, a cam, and an arm. However, one or two of them, or a part or all of them, The configuration of the rocking mechanism is not limited to that shown in the present embodiment, such as forming a rocking mechanism by combining with other members. Further, in each of the above-described embodiments, the case where the present invention is applied to the tape traveling drive unit of the video reproducing / recording apparatus has been described. However, the present invention relates to a reproduction-only video or cassette reproducing apparatus, a cassette tape recorder, an open reel. It is needless to say that the present invention can be widely applied to all devices for running a tape wound on a reel, such as a video or audio reproducing (re-recording) device of a type.

[0042]

As described above, according to the present invention, a pair of reel bases to be engaged with a reel of tape, a rotation gear fixed to each of the pair of reel bases, and one of the reel bases a movable gear disposed movably between a position meshing with the rotation gear rotation position and the other reel stand that meshes with the gear of the first drive source and said rotating the movable gear And transmitting the power of the first drive source to the moving gear.
In a reel drive switching mechanism comprising: a rotating unit having a rotation power transmission mechanism ; and a moving unit having a second drive source for moving the moving gear, the moving unit includes
Moving power for transmitting the power of the second drive source to the moving gear
Has a transfer mechanism, when the mode is switched, the first stops the driving source, the rotational direction opposite to the direction in which the movable gear was rotated by the rotating means by moving the movable gear at the moving unit To generate a rotational force. Therefore, at the time of mode switching in which the moving gear is moved to switch the reel base with which the moving gear meshes, the moving gear moves in a state of generating a rotational force in a direction opposite to the biting direction with respect to the rotating gear side of the reel base. It is only necessary to stop the drive source for rotating the moving gear while keeping the pinch roller pressed against the capstan shaft, and the moving gear moves smoothly and the tape runs when the tape resumes running. Can be prevented from becoming unstable, thereby preventing the tape from being damaged.

[Brief description of the drawings]

FIG. 1 is a plan view of a tape traveling drive unit of a video reproducing / recording apparatus including a reel drive switching mechanism according to a first embodiment of the present invention.

FIG. 2 is an enlarged side view of a feed side reel base portion of the linear skate chassis shown in FIG. 1;

FIG. 3 is an enlarged side view of a feed-side reel base portion of the linear skate chassis shown in FIG. 1;

FIG. 4 is an enlarged plan view of the power transmission mechanism shown in FIG.

FIG. 5 is an enlarged side view of a first swing arm portion shown in FIG. 1;

FIG. 6 is an enlarged plan view of a first swing arm portion shown in FIG. 1;

7 is an enlarged plan view of a swing gear meshed with a rotation gear of a take-up reel stand shown in FIG. 1 and a peripheral portion thereof;

FIG. 8 is an enlarged plan view of a swing gear meshed with a rotation gear of a feed-side reel stand shown in FIG. 1 and a peripheral portion thereof;

9 is an enlarged plan view of the swing mechanism shown in FIG.

FIGS. 10A and 10B are schematic diagrams showing the operation of a reel drive switching mechanism according to a second embodiment of the present invention.

FIG. 11 is an enlarged sectional view of a main part of a reel drive switching mechanism according to a third embodiment of the present invention.

12 is an enlarged bottom view of a main part of the drive switching mechanism of FIG. 11 during reproduction and fast-forward of a video tape.

FIG. 13 is an enlarged bottom view of a main part of the drive switching mechanism of FIG. 11 when the video tape is rewound.

FIG. 14 is an enlarged sectional view of a main part of a reel drive switching mechanism according to a fourth embodiment of the present invention.

FIG. 15 is an enlarged sectional view of a main part of a reel drive switching mechanism according to a fifth embodiment of the present invention.

16 is an enlarged bottom view of a main part of the drive switching mechanism of FIG. 15 during reproduction and fast-forward of a video tape.

17 is an enlarged bottom view of a main part of the drive switching mechanism of FIG. 15 when the video tape is rewound.

[Explanation of symbols]

 Reference Signs List 11 mechanical chassis (first chassis) 13 linear skate chassis (second chassis) 15 feed-side reel stand 1501 feed-side reel stand rotation gear 17 take-up reel stand 1701 take-up reel stand rotation gear 21 loading motor (moving) 23. Capstan motor (drive source for moving gear rotation) 29 Reel drive switching mechanism 31 Power transmission mechanism (power transmission mechanism for rotation) 3117 4th gear (relay gear) 3119 8th gear (relay) Gear) 3123 ninth gear (relay gear) 3131 eleventh gear (relay gear) 3139 twelfth gear (relay gear) 33 swing gear (moving gear) 35 power transmission mechanism (moving power transmission mechanism) 3502 second swing Arm (arm)

Continuation of the front page (56) References JP-A-2-260160 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 15/26 G11B 15/30 G11B 15/44

Claims (4)

(57) [Claims] 1. A pair of reel bases engaged with a reel of tape, a rotating gear fixed to each of the pair of reel bases, and a position meshing with the rotating gear of one of the reel bases and the other. a movable gear disposed movably between a position meshing with the reel base of the rotation gear, the first drive of the drive source and said first rotating the movable gear
A power transmission for rotation for transmitting the power of a power source to the moving gear
In a reel drive switching mechanism including a rotating means having a mechanism and a moving means having a second drive source for moving the moving gear, the moving means uses the power of the second drive source as the moving gear.
Has a moving power transmission mechanism for transmitting the A, during mode switching, stops the first driving source, the by pre <br/> Symbol rotating means by moving the movable gear at the moving unit A reel drive switching mechanism wherein a rotational force is generated in a direction opposite to the direction of rotation of the moving gear. 2. The moving power transmission mechanism includes an arm disposed swingably between the pair of reel bases, and the moving gear is rotatably supported by the arm. The reel drive switching mechanism described in the above. Wherein said rotational power transmission mechanism, the first
3. The reel drive switching mechanism according to claim 1, further comprising a relay gear rotated by a drive source and meshing with the moving gear, wherein the moving power transmission mechanism includes the relay gear. Wherein said pair of reel base is disposed in the second chassis which is vertically movably disposed relative to the first chassis,
4. The reel drive switching mechanism according to claim 1, wherein the second drive source is configured by a motor that moves the second chassis up and down.