JPH0521715Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a mode switching device that is most suitable for application to a recording/playback device such as a video tape recorder or an audio tape recorder, and is particularly suitable for driving a pair of reel stands. The present invention relates to a mode switching device related to.

Purpose of the invention This invention uses two motors to drive the rotation of the take-up reel stand and the supply reel stand, which are required when switching between a total of six modes: FWD, RVS, FF, REW, loading, and unloading. A mode that allows for a simplified structure and that prevents the take-up reel stand and the supply reel stand from unintentionally winding the tape even if vibrations, shocks, etc. occur during loading. The present invention attempts to provide a switching device.

Summary of the invention The invention consists of a supply reel stand, a take-up reel stand,
A first drive wheel and a second drive wheel; the first drive wheel is driven in forward rotation during FWD mode and unloading mode, and the first drive wheel is driven in reverse rotation during RVS mode and loading mode. a first motor that rotates the second drive wheel in the forward rotation mode in the FF mode and drives the second drive wheel in the reverse rotation in the REW mode; and a second motor that is always connected to the first drive wheel. a first drive wheel which is rotated in accordance with the rotational direction of the first drive wheel and is directly or indirectly engaged with one of the two reel stands to selectively drive the two reel stands. The reel is always engaged with the first oscillating rotating wheel and the second driving wheel, and is swung according to the rotational direction of the second driving wheel to directly or indirectly connect to either one of the two reels. A second oscillating rotary wheel that is engaged to selectively drive the two reel stands, and a second oscillating rotary wheel that is engaged to selectively drive the two reel stands, and restricts the first oscillating rotating wheel from being oscillated toward the supply reel stand during a loading mode. In the FWD mode and in the unloading mode, the first motor drives the first driving wheel in forward rotation to rotate the first oscillating rotation wheel in the forward direction. It is configured to be swingably engaged with the take-up reel stand to wind the tape, and in RVS mode and loading mode, the first motor drives the first drive wheel in reverse rotation. Then, in order to actively move the first oscillating rotary wheel away from the take-up reel stand side, the first oscillating rotary wheel is energized toward the supply reel stand side, and when in the RVS mode, the first oscillating rotary wheel is The tape is wound by being swingably engaged with the supply reel stand, and in the loading mode, the swing regulating member restricts the engagement of the first oscillating rotary wheel with the supply reel stand. In FF mode and
In the REW mode, the second motor drives the second driving wheel in forward rotation and reverse rotation, respectively, and moves the second oscillating rotation wheel toward the take-up reel stand side and the supply reel stand side. The present invention relates to a mode switching device that is configured to wind up a tape through selective rocking engagement.

According to the present invention configured in this way, FWD,
The structure is very simple because the rotation of the take-up reel stand and the supply reel stand required for switching between a total of 6 modes (RVS, FF, REW, loading and unloading) can be performed using two motors. be.

Also, during loading, the first oscillating rotary ring may accidentally come into contact with the take-up reel stand or the supply reel stand due to vibration or impact, causing the take-up reel stand or the supply reel stand to unexpectedly wind the tape. Never get caught.

Embodiment An embodiment of a mode switching device in which the present invention is applied to a video tape recorder will be described below with reference to the drawings.

First, the FWD and RVS drive systems and the FF and REW drive systems will be explained with reference to FIGS. 1 to 4.

First, in FIGS. 1 and 2, 1 is a chassis, and 2 and 3 are take-up and supply reel stands rotatably supported on the chassis 1 at a distance from each other. A pair of reel stand gears 4, 5 and 6, 7 of different sizes and diameters are integrally provided on both reel stands 2, 3, respectively. Also chassis 1
First and second drive gears 8 and 9, which are drive wheels, are rotatably supported at intermediate positions between the two reel stands 2 and 3 above. Note that both drive gears 8 and 9 are
They are arranged at intervals on a straight line _P2 that is substantially perpendicular to a straight line P1 connecting the centers of both reel stands 2 _{and 3} . First and second oscillating gears 11 and 12, which are oscillating rotation wheels, are disposed inside these drive gears 8 and 9. Also chassis 1
Above, on both sides of the first oscillating gear 11, a pair of intermediate gears 13 and 14, which are intermediate wheels that are always meshed with the reel base gears 4 and 6 of one of the reel bases 2 and 3, are rotatably supported. has been done.

By the way, both drive gears 8 and 9 are fixed to the upper ends of rotating shafts 17 and 18 which are rotatably supported by vertically passing through a pair of bearings 15 and 16 provided on the chassis 1. Pulleys 19 and 20 fixed to the lower ends of both rotating shafts 17 and 18 and the chassis 1
first and second motors 21, 22 attached to
A pulley 25 fixed to the motor shafts 23 and 24 of
Belts 27 and 28 are wound between the belt 26 and the belt 26.

The first motor 21 is a capstan drive motor, and is configured to drive a capstan (not shown), and also serves as the first drive gear 8 to drive forward and reverse rotation. The second motor 22 is a loading ring drive motor, and is configured to drive a loading ring (not shown) and also serves as the second drive gear 9 to drive forward and reverse rotation.

Also, both oscillating gears 11 and 12 have both rotating shafts 17,
Swing arms 3 each pivotably supported by 18.
The two oscillating gears 1 and 32 are rotatably supported via support shafts 33 and 34, respectively.
1 and 12 are always meshed with both drive gears 8 and 9, respectively. The first oscillating gear 11 is configured to be oscillated between the two intermediate gears 13 and 14 according to the rotational direction of the first drive gear 8, and to be selectively engaged with the two intermediate gears 13 and 14. has been done. Further, the second oscillating gear 12 is oscillated between the other reel stand gears 5 and 7 of both reel stands 2 and 3 according to the rotational direction of the second drive gear 9, and is It is configured to be selectively engaged with. Note that both oscillating gears 11 and 12 are provided with a rotation loss torque imparting means (not shown).
Both swing gears 11 and 12 by both drive gears 8 and 9
When the rotation is driven, the rotation loss torque becomes a load and a rotation moment acts on both swing arms 31 and 32, and the rotation moment causes both swing gears 11 and 12 to move in accordance with the rotation direction of both drive gears 8 and 9. It is configured so that it can be swung.

In addition, the support shafts 33 and 34 of both oscillating gears 11 and 12
The lower ends thereof extend downward and are inserted into swing range regulating openings 35 and 36 provided in the chassis 1, respectively. Also, a position regulating plate 37 that is a swing regulating member engaged with both of these support shafts 33 and 34
is installed on chassis 1. This position regulating plate 37 is engaged with a pair of guide shafts 38 mounted on the chassis 1 through a pair of elongated holes 39, and is moved along a direction substantially parallel to the straight line P ₂ to a first position described later. It is configured to be able to freely reciprocate between the position and the second position.

By the way, the FWD and
The RVS drive system includes a first motor 21, a belt 27,
It is composed of a first drive gear 8, a first oscillating gear 11, both intermediate gears 13 and 14, both reel stand gears 4 and 6, and the like. In addition, the FF and REW drive systems are
It is composed of a second motor 22, a belt 28, a second drive gear 9, a second oscillating gear 12, both reel stand gears 5 and 7, and the like.

Next, the FWD and RVS drive systems described above and the FF and
The driving situation of both reel stands 2 and 3 by the REW drive system will be explained with reference to FIGS. 1, 3, and 4. Note that FIG. 1 shows the stop mode.

First, FIG. 3 shows the FWD and RVS driving states, and in the FWD and RVS modes, the position regulating plate 37 is moved to a first position A, which will be described later. When the position regulating plate 37 is at the first position A, the first oscillating gear 11 is allowed to oscillate, and the second oscillating gear 12
is regulated to approximately the middle position of the swing range.

Next, in the FWD mode, the first motor 21 is driven to rotate at a constant speed in the direction of arrow a, and the first drive gear 8 is driven to rotate in the direction of arrow b. Then,
The first oscillating gear 11 is rotated in the direction of the arrow c and swung together with the swinging arm 31 in the direction of the arrow d, and is meshed with one of the intermediate gears 13 as shown by a solid line. As a result, the take-up reel stand 2 is rotated at a constant speed in the direction of arrow e by the first oscillating gear 11 via the intermediate gear 13 and both reel stand gears 4.
FWD drive (recording or reproducing during normal driving) will be performed.

Next, in the RVS mode, the first motor 21 is driven to rotate at a constant speed in the direction of arrow a', and the first drive gear 8 is driven to rotate in the direction of arrow b'. Then, the first oscillating gear 11 is rotated in the direction of the arrow c' and swung together with the swinging arm 31 in the direction of the arrow d', and meshes with the other intermediate gear 14 as shown by the imaginary line. As a result, the supply reel stand 3 is rotated at a constant speed in the direction of arrow e' by the first oscillating gear 11 via the intermediate gear 14 and the reel stand gear 6.
RVS drive (recording or playback in reverse running) will be performed.

Next, Figure 4 shows the FF and REW drive states, and in the FF and REW modes, the position regulating plate 3
7 has been moved to a second position B, which will be described later. When the position regulating plate 37 is at the second position B, the first oscillating gear 11 is regulated at approximately the middle position of the oscillating range, and the second oscillating gear 12 is at the substantially intermediate position of the oscillating range. It is now possible to move.

Next, in the FF mode, the second motor 22 is driven to rotate at high speed in the direction of the arrow f, and the second drive gear 9 is driven to rotate in the direction of the arrow g. Then, the second oscillating gear 12 is rotationally driven in the direction of the arrow h and is swung together with the swinging arm 32 in the direction of the arrow i, so as to mesh with the reel base gear 5 as shown by the solid line. As a result, the take-up reel stand 2 is rotated at high speed in the direction of arrow e by the second oscillating gear 12.
FF drive (fast forward) will be performed.

Next, in the REW mode, the second motor 22 is driven to rotate in the direction of the arrow f' in reverse at high speed, and the second drive gear 9 is driven to rotate in the direction of the arrow g'. Then,
The second oscillating gear 12 is rotated in the direction of the arrow h' and swung together with the swinging arm 32 in the direction of the arrow i' to mesh with the reel base gear 7 as shown by the solid line. As a result, the supply reel stand 3 is driven to rotate at high speed in the direction of arrow e' by the second oscillating gear 12.
REW drive (rewinding) will be performed.

The loading and unloading of the tape is performed by driving the loading ring forward or backward by the second motor 22. Therefore, when loading and unloading the tape, FF and
The second oscillating gear 12 is about to be swung in the directions of arrows i and i' in FIG. 4 in the same way as during REW driving, but during this loading and unloading, the position regulating plate 37 as shown in FIG. The second oscillating gear 12 has been moved to the first position A.
It regulates the fluctuation of the

Next, the movement control mechanism for the position restricting plate 37 will be described with reference to Figs. 5 to 9C.

First, in FIG. 5, the position regulating plate 37 has a pair of position regulating holes 41, 42 for alternately regulating the positions of the first and second oscillating gears 11, 12. They are provided in two locations: the top and bottom, and the center part. Both position regulation holes 41, 42
has a vertically symmetrical shape, and the center regulating groove 41
a, 42a, and openings 41c, 42c having a pair of slopes 41b, 42b extending on both sides thereof. The lower end sides of the support shafts 33, 34 of the oscillating gears 11, 12 are inserted into the position regulating holes 41, 42, as shown in FIG.

Next, a slider 43 is mounted on the chassis 1 and is capable of reciprocating in a direction perpendicular to the vertical movement direction of the position regulating plate 37 in FIG. The slider 43 is engaged with a pair of guide shafts 44 fixed on the chassis 1 through a pair of elongated holes 45. Further, the slider 43 escapes from the support shaft 33 through a long hole 46 at the intersection with the support shaft 33. Further, a rotating lever 47 connecting the slider 43 and the position regulating plate 37 is mounted on the chassis 1. This rotary lever 47 is rotatably supported on the chassis 1 via a fulcrum shaft 48 at a substantially central portion in its longitudinal direction, and a pin 49 provided at one end thereof is connected to a pin 49 provided on the slider 43. A pin 51 is engaged in a cam groove 50 having a substantially inverted trapezoidal shape and is provided at the other end.
is engaged with a long hole 52 provided in the position regulating plate 37.

Next, as shown in FIG. 5, a small third motor 54 that can rotate forward and backward is mounted on the chassis 1, and a worm 5 is attached to the motor shaft 52.
6 is fixed.

Next, as shown in FIG. 6, a switch control rotating body 57 is disposed at the bottom of the take-up reel stand 2. Note that this rotating body 57 is rotatably attached to the outer periphery of a reel center shaft 58 fixed on the chassis 1. And the worm 56 and the rotating body 57
Worm gear 59 and gear 6 integrated with it
It is moved via a gear mechanism consisting of zero and two-stage gears 61 and 62, and one of two-stage gears 63 and 64 formed on the outer periphery of the rotating body 57. A rack 65 is formed at one end of the position regulating plate 37, and a pinion 66 meshed with the rack 65 is meshed with the other gear 64 of the rotating body 57 via a gear 67 integrated therewith.

Next, as shown in FIGS. 7 and 8, a spring contact 68 is fixed to the lower part of the rotating body 57, and this spring contact 68 has, for example, four terminals 68.
A is provided. On the other hand, the chassis 1 is configured as a chassis with a so-called wiring function, and a wiring pattern 70 is printed on the upper surface of the chassis 1 via an insulating layer 69. A switching pattern 70a formed by the wiring pattern 70 is formed on the upper surface of the chassis 1 below the rotating body 57. This switching pattern 70a is formed on the outer periphery of the reel center shaft 58 in a quadruple concentric circular arrangement corresponding to the four terminals 68a of the spring contact 68.
7, the four terminals 68 of the spring contact 68
A is configured to slide on the switching pattern 70a to perform a desired switching operation.

Next, the movement control situation of the position regulating plate 37 described above will be explained with reference to FIG. 5 and FIGS. 9A to 9C. Note that FIG. 5 shows the stop mode, in which the position regulating plate 37 has been moved to the second position B. Further, in this stop mode, the rotating body 57 is located at the stop position _C1 in FIG. 7, and the slider 43 is also located at the stop position _C2 in FIG. Also, in this stop mode, the pin 49 of the rotating lever 47 is inserted into the cam groove 50.
is located at the stop position _C3 .

Next, when the stop mode is switched to the FWD and RVS modes, the third motor 54 is driven to rotate in the forward direction, and the rotating body 57 is driven to rotate in the direction of arrow j in FIG. 5 through the gear mechanism by the worm 56. .
Then, the pinion 66 is rotated by the rotating body 57 in the direction of the arrow k in FIG. 5, the rack 65 is driven by the pinion 66, and the slider 43 is moved in the direction of the arrow l in FIG.

However, at this time, as shown in FIG. 7, the rotating body 57 is rotated, for example, by approximately 90 degrees, and the rotating body 57 is rotated to the FWD and RVS positions _D1.
When the third motor 54 is reached, the position is detected by the above-mentioned switching operation and the third motor 54 is stopped. As a result, the slider 43 that has been moved in the l direction is at the FWD and RVS position D ₂ as shown in FIG. 9A.
It will be stopped at . On the other hand, as the slider 43 moves in the direction of the arrow l, the pin 49 of the rotating lever 47 passes through one inclined part 50a of the cam groove 50, and the FWD and
Guided to RVS position D ₃ . As a result, the rotation lever 47 is rotated in the direction of arrow m due to the guidance.
The rotation lever 47 moves the position regulating plate 37 to the first position.
is moved to position A.

When the position regulating plate 43 is moved to the first position A as shown in FIG. 9A, the first oscillating gear 1
The support shaft 33 of 1 is located in the center regulation groove 41 of the position regulation hole 41.
a into the opening 41c, and the first oscillating gear 11 can swing. Meanwhile, at the same time, the support shaft 34 of the second oscillating gear 12 is guided into the center regulating groove 42a of the position regulating hole 42, and the second oscillating gear 12 is brought to approximately the center position of the oscillating range. Regulated.

Next, when the stop mode is switched to the FF and REW modes, the third motor 54 is driven to rotate in the opposite direction, and the rotating body 57 is driven to rotate in the direction of arrow j' in FIG. 5 through the gear mechanism by the worm 56. Ru. Then, the pinion 66 is rotated by the rotating body 57 in the direction of arrow k' in FIG.
It is moved in the direction of arrow l' in the figure.

7, when the rotor 57 is rotated, for example, by about 90° and reaches the FF and REW position _E1 , the position is detected by the above-mentioned switching operation and the third motor 54 is stopped. As a result, the slider 43 which has been moved in the direction of the arrow l' as shown in FIG. 9B reaches the FF and REW position E1.
On _the other hand, the arrow of the slider 43
By the movement in the l' direction, the pin 49 of the pivot lever 47
is guided along the straight portion 50b of the cam groove 50 to the FF and REW position _E3 . At this time, the rotating lever 47 is not rotated, and therefore the position restriction plate 37 is held in the second position B, which is the same as in the stop mode.

When the position regulating plate 43 is at the second position B as shown in FIG. 9B, the first oscillating gear 11
The support shaft 33 is located in the center regulation groove 41a of the position regulation hole 41.
As a result, the first oscillating gear 11 is regulated to approximately the center position of the oscillating range. Meanwhile, at the same time, the support shaft 34 of the second oscillating gear 12 is guided from the central regulating groove 42a of the position regulating hole 42 into the opening 42c, and the second oscillating gear 11 is enabled to swing. .

Next, when the stop mode is switched to the loading and unloading mode, the third motor 54 is driven to rotate in the opposite direction, and the rotating body 57 is similarly driven to rotate in the direction of arrow j' in FIG.
3 is similarly moved in the direction of arrow l' in FIG.

However, in this case, as shown in FIG.
For example, when motor 7 is rotated approximately 180° and passes through FF and REW positions E ₁ to reach loading and unloading positions F ₁ , that position is detected by the aforementioned switching operation and the third motor 5
4 is stopped. As a result, as shown in FIG. 9C, the slider 43, which has been moved in the direction of arrow l', passes through the FF and REW positions _E2 , reaches the loading and unloading positions _F2, and is stopped. On the other hand, as the slider 43 moves in the direction of the arrow L', the pin 49 of the rotary lever 47 moves into the straight part 50 of the cam groove 50.
b and the other inclined portion 50c to the loading and unloading position _F3 . As a result, the rotation lever 47 is rotated in the direction of the arrow m by the guidance, and the position regulating plate 37 is moved by the rotation lever 47 to the first position A, which is the same as in the FWD and RVS modes.

According to the mode switching device described above, in the FWD and RVS modes, the second oscillation gear 12 on the FF and REW drive systems is restricted to the approximately central position of the oscillation range, and the second oscillation gear 12 is Gear 12 accidentally comes into contact with both reel stand gears 5 and 7, causing FWD and
Prevents wow, flutter and jitter from occurring in RVS mode. Also FF and REW
In the mode, the first oscillating gear 11 on the FWD and RVS drive system side is regulated to approximately the center position of the oscillating range, and the first oscillating gear 11 is connected to both intermediate gears 1.
3 and 14, to prevent an increase in load torque and generation of noise during FF and REW modes.

Next, as shown in FIGS. 10 to 14, a swing regulating member and its regulation control mechanism for regulating the engagement of the first oscillating gear 11 with the supply reel stand 3 side during the loading mode are shown. Explain.

First, in FIGS. 10 and 11, the swing regulating lever 73, which is a swing regulating member, has a substantially V-shape, and one end thereof is rotated by one of the guide shafts 38 of the position regulating plate 37. It is pivoted for free movement. A swing regulating pin 74 integrally provided on the other end of the swing regulating lever 73 is connected to the swing arm 3.
It is arranged at a position biased toward the supply reel stand 3 within the swing range of 1. Further, a restriction release lever 75 for releasing the swing restriction of the swing restriction lever 73 is arranged at the lower part of the supply reel stand 3.
The restriction release lever 75 has a substantially V-shape and is rotatably supported on a reel center shaft 76 fixed on the chassis 1, and swings a pin 77 provided at one end of the lever 75. It is engaged with a long hole 78 provided in the regulation lever 73.

Next, a pair of left and right main brakes 82, 83 and soft brakes 84, 85 that can be pressed and separated are provided on the outer circumferential surfaces 80, 81 of the reel bases 2, 3.
The brakes 84, 85 are fixed to the chassis 1 by a pair of left and right fulcrum shafts 86, 87.
The main brakes 82 and 83 are urged to rotate in the direction in which they are pressed against the outer circumferential surfaces 80 and 81 of the reel bases by a common brake pressing spring 88 connected between them.
The brake springs 89, 90 are connected to the reel bases 5, 6, and 7, respectively.
The springs 89 and 90 are configured to be weaker than the spring 88.
A pair of pins 91, 92 provided on arms 82a, 83a provided integrally with the position regulating plate 37 are in contact with an end surface 93 on the lower end side of the position regulating plate 37 in Fig. 10. A pair of protrusions 94 for controlling a pair of arms 84a, 85a provided integrally with both soft brakes 84, 85 are provided integrally with the position regulating plate 37 on both left and right sides on the lower end side of the position regulating plate 37 in Fig. 10.

Next, a protruding piece 9 is provided on one end side of the slider 43.
6 are integrally provided. An inclined surface 97 is provided at the right end of this protruding piece 96 in FIG.
This inclined surface 9 in FWD and RVS modes described later
7 is configured to abut against a protrusion 98 provided on one end side of the restriction release lever 75. Further, a protruding piece 99 integrally provided with the soft brake 85 on the side of the supply reel stand 3 is inserted into the lower part of the supply reel stand 3, and a protruding piece 99 is inserted into the lower part of the supply reel stand 3.
The pin 100 provided at the other end of 5 is the protruding piece 9
It is engaged with a long hole 101 provided in 9. Further, a brake release lever 102 is rotatably supported on the fulcrum shaft 48 of the rotary lever 47. This brake release lever 102 has a substantially L-shape, and one end 102a of the brake release lever 102 is connected to both main brakes 8.
It is arranged at a position where it can come into contact with both arms 82a and 83a of No. 2 and 83. Note that one end 102a thereof is provided with a long hole 1 in the other of both guide shafts 38 of the position regulating plate 37.
03. A pin 10 provided at the other end of this brake release lever 102
4 is engaged in a substantially trapezoidal cam groove 105 provided on the protruding piece 96 of the slider 43. Note that a weak spring 106 is bridged between the other end of the brake release lever 102 and the protruding piece 99 of the soft brake 85.

Next, the first
The control status of the swing regulation of the swing gear 11 is shown in the 10th table.
This will be explained with reference to the drawings and FIGS. 12 to 14. Note that FIG. 10 shows the stop mode, at which time the position regulating plate 37 has been moved to the second position B mentioned above, and both main brakes 82 and 83 are in the position of the spring 88.
These are rotated in the direction of the arrow n by the reel stands 2 and 3, respectively, and are press-fitted to the outer circumferential surfaces 80 and 81 of both reel stands 2 and 3, respectively. Therefore, in the stop mode, the main brakes are applied to both reel stands 2 and 3. In this stop mode, both protruding pieces 94 of the position regulating plate 37 are in contact with both arms 84a, 85a of both soft brakes 84, 85, and both soft brakes 84, 85 are moved against both springs 89, 90. They are rotated in the direction of arrow r and separated from both reel stands 2 and 3, respectively. Further, in this stop mode, one end 102a of the brake release lever 102 is separated from both arms 82a and 83a.

Next, FIG. 12 shows the FWD and RVS mode, and when the stop mode is switched to the FWD and RVS mode, the slider 43 is moved from the arrow l direction to the FWD and RVS mode position D ₂ as described above. The position regulating plate 37 is moved to the first position A. Then, both pins 91 and 92 are pushed by the end surface 93 of the position regulating plate 37, and both main brakes 82 and 83 are rotated in the direction of arrow n' against the spring 88, and both reel stands 2 and 3 are rotated in the direction of arrow n'. The skeins are spaced apart.
At the same time, the position regulating plate 37 is moved to the first position A.
As a result, both protruding pieces 94 are separated from both arms 84a and 85a, and both soft brakes 84 and 85 are rotated in the direction of arrow r' by both springs 89 and 90, respectively. These are pressed onto the outer peripheral surfaces 80 and 81 of both reel stands 2 and 3, respectively.

On the other hand, at this time, the inclined surface 97 of the protruding piece 96 of the slider 43 comes into contact with the protruding part 98 of the restriction release lever 75. Then, the restriction release lever 75 is rotated in the direction of arrow q, the swing restriction lever 73 is rotated in the direction of arrow p, and the swing restriction pin 74 is moved out of the swing range of the swing arm 31. . At this time, the soft brake 85 on the supply reel stand 3 side is rotated in the direction of arrow r against the spring 90 by the restriction release lever 75, and is separated from the outer peripheral surface 81 of the supply reel stand 3. Therefore, in the FWD and RVS modes, the soft brake 84 is applied only to the take-up reel stand 2 side.

By the way, as mentioned above, the take-up reel stand 2 is FWD.
In mode, it is rotated in the direction of arrow e, and
In the RVS mode, the rotation is driven in the direction of arrow e', but it affects the position setting of the soft brake 84 and the fulcrum shaft 86 with respect to the center of the take-up reel stand 2, the radius of the outer circumferential surface 80 of the take-up reel stand 2, and the outer circumferential surface 80 of the take-up reel stand 2. setting of the arm length from the fulcrum shaft 86 of the soft brake 84 to be
By setting the crimping direction in step 4, etc., the take-up reel stand 2
Soft brake 8 for rotation in the direction of arrow e.
4 acts in the escape direction, and the soft brake 84 is configured to act in the biting direction for rotation in the direction of arrow e'. Therefore, in the FWD mode, the soft brake 84 hardly applies any load to the rotation of the take-up reel stand 2 in the direction of arrow e.
On the other hand, in the RVS mode, the soft brake 84 applies an appropriate load to the rotation of the take-up reel stand 2 in the direction of arrow e', and as a result, an appropriate back tension is applied to the tape.

Next, FIG. 13 shows the FF and REW modes, and when the stop mode is switched to the FF and REW modes, the slider 43 moves with the arrow as described above.
After being moved from the l' direction to the FF and REW positions _E2 , the position regulating plate 37 is moved to the second position B again.
Then, both arms 84a, 85a are pushed again by both projecting pieces 94 of position regulating plate 37, and both soft brakes 84, 85 are rotated in the direction of arrow r, respectively, against springs 89, 90, and both reels are rotated. It is separated from the tables 2 and 3. On the other hand, as the position regulating plate 37 is moved to the second position B at this time, both the main brakes 82 and 83 are about to be rotated in the direction of the arrow n by the spring 88. Due to the guiding action of the pin 104, the brake release lever 1
02 is rotated in the direction of arrow s, and its one end 102
a presses both arms 82a and 83a. As a result, both main brakes 82 and 83 are rotated in the direction of arrow n' against the spring 88, and both reel stands 2 and 3 are rotated in the direction of arrow n'.
be separated from

Next, FIG. 14 shows the loading and unloading mode, and when the stop mode is switched to the loading and unloading mode, the slider 43 moves from the arrow l' direction through the FF and REW positions E ₂ to the loading position as described above. _Then , the position regulating plate 37 is moved to the first position A again. Then, when the slider 43 passes through the FF and REW positions _E2 , the brake release lever 102, which was once rotated in the direction of arrow s as shown in FIG. 13, is rotated in the direction of arrow s' and returns to the position in the stop mode. At the same time, both the arms 82a and 83a are pushed again by the end surface 93 of the position regulating plate 37, and both the main brakes 82 and 83 are moved again against the spring 88 in the directions indicated by the arrows.
It is rotated in the n' direction and separated from both reel stands 2 and 3.

On the other hand, at this time, the protruding piece 96 of the slider 43 is separated from the protruding part 98 of the restriction release lever 75, and at the same time both protruding pieces 94 of the position regulating plate 37 are separated again from both arms 84a, 85a of both soft brakes 84, 85. As a result, both soft brakes 84 and 85 are activated by both springs 89 and 90, respectively.
These are rotated in the r′ direction, and both reel stands 2 and 3 are rotated.
are crimped onto the outer circumferential surface of each. At this time, the regulation release lever 75 is rotated in the direction of the arrow q' by the soft brake 85 on the supply reel stand 3 side, and the swing regulation lever 73 is rotated by the regulation release lever 75 in the direction of the arrow q'.
It is rotated in the p' direction, and the swing regulating pin 74 enters a position biased toward the supply reel stand 3 within the swing range of the swing arm 31.

However, in this video tape recorder, even in the loading and unloading modes, the first motor 21 is driven in forward and reverse rotations in the same manner as in the FWD and RVS modes shown in FIG.
The first swing gear 11 is configured to swing in the directions of arrows d and d'.

That is, during unloading, as shown in FIG. 3, the first motor 21 is driven to rotate forward in the direction of arrow a in the same way as in the FWD motor, and the first oscillating gear 11 is driven by the first drive gear 8. While being rotationally driven in the direction of arrow c, the swing arm 31 is caused to swing in the direction of arrow d to mesh with the intermediate gear 13 on the take-up reel stand 2 side, and the first swing gear 11 takes up the winding. The reel stand 2 is rotated in the direction of arrow e to wind up the tape into a tape cassette (not shown).

Next, during loading, the first motor 21 is moved to the direction indicated by the arrow a in FIG.
while driving the first oscillating gear 11 to rotate in the direction of arrow c' with the first drive gear 8, rotationally energizing it together with the swinging arm 31 in the direction of arrow d', The first oscillating gear 11 is actively separated from one intermediate gear 13 on the take-up reel stand 2 side. However, at this time, as shown in FIG. 14, by bringing the swing arm 31 into contact with the swing regulating pin 74, the swing of the first swing gear 11 toward the supply reel stand 3 is restricted. Then, the first oscillating gear 11 is connected to the intermediate gear 14 on the supply reel stand 3 side.
This prevents accidental engagement. During loading, both soft brakes 84 and 85 applied to both reel stands 2 and 3 act as
This prevents tape overrun (tape loosening due to inertia) when loading is completed.

That is, according to this video tape recorder, during unloading, the first oscillating gear 11 is swung toward the take-up reel stand 2, and the take-up reel stand 2 is rotationally driven to unload the tape cassette. During loading, the first oscillating gear 11 does not need to perform any special function; You can also leave it free. However, when loading
If the oscillating gear 11 is left free,
The first oscillating gear 11 may unexpectedly bite into the intermediate gear 13 on the take-up reel stand 2 side due to vibration or impact, and the load of the rotational drive of the loading ring becomes abnormally large, causing damage to the inside of the tape cassette. This causes an inconvenience in that it becomes impossible to pull out the tape from the tape.
On the other hand, if the first oscillating gear 11 unexpectedly meshes with the intermediate gear 14 on the supply reel stand 3 side during loading, and the tape winding by the supply reel stand 3 is unexpectedly performed, at that moment This causes the tape position to shift, and repeating loading and unloading causes a disadvantage in that the tape position shifts significantly.

Therefore, as described above, during loading, the first oscillating gear 11 is actively prevented from moving from the intermediate gear 13 on the take-up reel stand 2 side, and at the same time, the first oscillating gear 11 is prevented from moving away from the intermediate gear 13 on the supply reel stand 3 side. intermediate gear 1 of
By regulating (preventing) the tape from being engaged with the tape cassette 4, it is possible to prevent inconveniences such as the inability to pull out the tape from the tape cassette and the tape being misaligned.

In the embodiments described above, the drive wheel, the oscillating rotary wheel, etc. are constructed of gears, but these may also be constructed of friction rotary wheels.

Application Example The present invention is not limited to the video tape recorder mode switching device described in the embodiment, but can be applied to various recording and reproducing devices such as audio tape recorders and other various information processing devices.

Effects of the invention As mentioned above, the present invention provides a take-up reel stand and a supply for tape winding drive in the FWD (recording or playing during normal running) mode and the RVS (recording or playing during return running) mode. One motor (first motor) can be used to drive the rotation of the reel stand and the rotation of the take-up reel stand for tape winding drive in the unloading mode. and REW
Another motor (second motor) can rotate the take-up reel stand and the supply reel stand for tape winding drive in the mode. Therefore, since the rotational drive of the take-up reel stand and the supply reel stand required when switching between a total of six modes (FWD, RVS, FF, REW, loading and unloading) can be performed by two motors, the structure is simple. is very simple.

Also, in the loading mode, the first motor drives the first drive wheel in reverse rotation to actively move the first oscillating rotation wheel away from the take-up reel stand side. At the same time, the first oscillating rotary wheel is prevented from engaging with the supply reel stand by the swing regulating member. Therefore, during loading, the first oscillating rotating ring may unexpectedly come into contact with the take-up reel stand or the supply reel stand due to vibrations, shocks, etc., and the tape may not be wound up by the take-up reel stand or the supply reel stand unexpectedly. never done.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a mode switching device for a video tape recorder, in which FIG. 1 is a plan view showing the stop mode of the drive system, and FIG. Cross-sectional view as seen from the arrow,
Fig. 3 is a plan view showing the FWD and RVS modes of the drive system, Fig. 4 is a plan view showing the FF and REW modes of the drive system, and Fig. 5 is a plan view showing the movement control mechanism of the position regulating plate. , FIG. 6 is a developed cross-sectional view as viewed from the line shown in FIG. 5, FIG. 7 is a plan view showing the rotary wheel for controlling the switch, and FIG. FIGS. 9A to 9C are plan views explaining the control operation of the position regulation plate, FIG. 10 is a plan view showing the swing regulation lever and its regulation control mechanism,
FIG. 11 is a developed sectional view taken along the line X--X in FIG. 10, and FIGS. 12 to 14 are plan views for explaining the control operation of the swing regulating lever. Further, in the symbols used in the drawings, 2...take-up reel stand, 3...supply reel stand, 4...reel stand gear, 8...first drive gear, 9...second drive gear, 11 ...First oscillating gear, 12... Second oscillating gear, 13, 14... Intermediate gear, 21
...First motor, 22 ...Second motor, 31
...Swinging arm, 37...Position regulation plate, 43...
Slider, 47... Rotating lever, 54... Third
Motor, 73... Swing regulation lever, 74... Swing regulation pin, 75... Regulation release lever, 84,8
5... Soft brake, 102... Brake release lever.

Claims (1)

[Claims for Utility Model Registration] The supply reel stand 3 and the take-up reel stand 2, the first drive wheel 8 and the second drive wheel 9, and the first drive wheel 8 in the FWD mode and the unloading mode. A first motor 21 that rotates forward and drives the first driving wheel 8 in reverse rotation in the RVS mode and loading mode, and drives the second driving wheel 9 in forward rotation in the FF mode and in the REW mode. A second motor 22 that drives the second drive wheel 9 in reverse rotation, and a second motor 22 that is always engaged with the first drive wheel 8 and that
is swung according to the rotational direction of the drive wheel 8 and is directly or indirectly engaged with either one of the reel stands 3 and 2 to selectively drive the two reel stands 3 and 2 to rotate. The first oscillating rotary wheel 11 is always engaged with the second drive wheel 9, and this second
is swung according to the rotational direction of the drive wheel 9 and is directly or indirectly engaged with either one of the reel stands 3 and 2 to selectively drive the reel stands 3 and 2 to rotate. each comprises a second oscillating rotary wheel 12 and a swing regulating member 73 that restricts the first oscillating rotary wheel 11 from swinging toward the supply reel stand 3 side during loading mode, In the FWD mode and in the unloading mode, the first motor 21 drives the first drive wheel 8 in the forward rotation, and swings the first oscillating rotary wheel 11 toward the take-up reel stand 2 side. It is configured to wind the tape by dynamic engagement, and in RVS mode and loading mode,
The first drive wheel 8 is driven by the first motor 21.
When in the RVS mode, the first oscillating rotary wheel 11 is energized toward the supply reel stand 3 side in order to actively move it away from the take-up reel stand 2 side. The first oscillating rotary wheel 11 is oscillatingly engaged with the supply reel stand 3 side to wind up the tape, and in the loading mode, the first oscillating rotary wheel 11 is connected to the supply reel stand 3 side. The second swing control member 73 is configured to restrict engagement with the second swing control member 73 during the FF mode and the REW mode.
The motor 22 drives the second driving wheel 9 in forward rotation and reverse rotation, respectively.
A mode switching device configured to wind the tape by selectively swingingly engaging the oscillating rotary wheel 12 with the take-up reel stand 2 side and the supply reel stand 3 side.