JPS6213735B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mode switching device for switching a tape recorder from a stopped state or an operating state such as playback or recording to a state such as fast forwarding or rewinding.

When switching the operating mode of a tape recorder from a stopped state or an operating state such as playback or recording to a state such as fast forward or rewind, it is generally done by directly moving an idler mechanism or the like using manual operating force. However, this case has the drawback of requiring strong operating force.

Therefore, mode switching devices have been developed that use electromagnets to move the idler mechanism and switch modes, but since these devices require fairly large electromagnets, the overall size of the tape recorder has to be reduced.
This is a significant disadvantage in terms of weight reduction, and also has the disadvantage of increased power consumption.

Also, if the capstan drive motor can also be used as the drive source for the mode switching device,
In particular, since there is no need to provide a drive source, it is easy to make the device smaller and lighter, and it is possible to suppress an increase in power consumption. However, if the motor for driving the capstan is also used as the drive source for the mode switching device,
This increases the load on the motor and causes uneven rotation of the capstan, which poses a problem that impairs the performance of the tape recorder.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a mode switching device for switching the operating mode of a tape recorder from a stopped state or an operating state such as playback or recording to fast forwarding, rewinding, etc. The purpose of the present invention is to prevent uneven rotation of the capstan while also using the same motor as a drive source, and to reduce the size, weight, and power consumption of the capstan.

First, the principle of the present invention is shown in FIG. That is,
The main drive rotating section 3 is rotated by the motor 2 that drives the capstan 1, and the rotational force of the main drive rotating section 3 is selectively transmitted to the switching operation section 5 by operating the trigger device 4 at a predetermined timing. The switching operation section 5 switches the idler mechanism 6 between the main drive rotation section 3 and the driven rotation section 8 provided on the reel shaft 7.
The rotational force of the main drive rotating section 3 is transmitted to the reel shaft 7 by selectively inserting the rotational force between the main drive rotating section 3 and the reel shaft 7.

The above specific configuration will be explained based on the embodiments shown in FIG. 2 and subsequent figures.

The mode switching device shown here is attached to a single mounting plate 9, and is incorporated into the tape recorder by attaching this mounting plate 9 to the tape recorder board. FIG. 2 mainly shows the part to be attached to the lower surface of the mounting plate 9, and FIG. 3 shows the part to be attached to the upper surface. FIG. 4 shows the specific structure of the main drive rotating section 3, which consists of one shaft 11 that penetrates through the center of the mounting plate 9 via a bearing 10, and the top and bottom of this shaft 11. A driving roller 12 and a spring receiver 13 are respectively attached to the ends.
An integrated structure including a pulley 14 and a main drive gear 15 rotatably glued to the center of the shaft 11 on the lower surface side of the mounting plate 9, and a friction sheet 16 such as felt attached to the upper surface of the integrated structure. a friction plate 17 rotatably mounted on the shaft 11 at a position;
The friction sheet 16 is interposed between the friction plate 17 and the spring receiver 13 in a compressed state, and
A compression spring 18 is pressed against the lower surface of the spring receiver 13, and several locking claws 13A and 17A are provided on each opposing surface of the spring receiver 13 and the friction plate 17 so as to abut against each other in the direction of rotation. And this main rotating part is
It is driven by a capstan drive motor 2, and this configuration is shown in FIG. That is, the flywheel 19 is attached to the capstan 1, and the motor 2 is attached to the capstan 1.
Two-stage pulleys 21 and 22 are respectively attached to the rotating shaft 20 of the two-stage pulley, and one of the two-stage pulleys 21 and the flywheel 19 are interlocked via a flat belt 23, and the other two-stage pulley 22 and the main drive rotating section 3 pulley 14
and are interlocked via a V-belt 24. Therefore, when the pulley 14 is driven by the motor 2, the rotational force of the pulley 14 is applied to the friction plate 1.
7. Shaft 1 via spring 18 and spring bearing 13
1, and the driving roller 12 located on the upper surface side of the mounting plate 9 rotates.

Further, on the lower surface side of the mounting plate 9, as shown in FIG.
5B is rotatably attached. These rotating bodies 25A, 25B have a notch 26A,
26B, spiral-shaped rotating cam 27 at the center of rotation
A, 27B, pressure receiving protrusion 28 on the top surface of each rotating cam
A, 28B, a pair of locking protrusions 29 each on the upper surface periphery
A, 30A and 29B, 30B, respectively,
The positions of the pair of protrusions 29A, 30A or 29B, 30B are slightly different in both the rotational direction and the radial direction. Also, locking members 31 are provided on the left and right sides of the mounting plate 9.
A and 31B are pivotally supported at their respective central portions via shafts 32A and 32B. These locking members each have a stopper pin 33A, 33B at one end, and have magnetic pieces 34A, 34B inside the other end, and springs 35A, 35B, respectively, cause the left locking member 31A to move counterclockwise. direction, left and right locking members 31B
is given a rotational force in the clockwise direction, and the mounting plate 9
It is held in a position where it abuts against stoppers 36A and 36B provided at. Further, electromagnets 37A and 37B are attached to the left and right sides of the mounting plate 9. These electromagnets are formed by winding coils 39A and 39B around one piece of the letter-shaped yokes 38A and 38B. It constitutes the device 4. In other words, there is a pair of left and right trigger devices 4A, 4B. When the left coil 39A is energized, the left locking member 3
1A rotates and the magnetic piece 34A is rotated as shown in FIG.
are attracted to both ends of the yoke 38A, and when the right coil 39B is energized, the right locking member 31B rotates and the magnetic pieces 34B are attracted to both ends of the yoke 38 as shown in FIG. On the other hand, each switching rotary body 25A, 25B has its pressure receiving protrusion 28A, 28B.
are pushed by bar springs 40A and 40B, and a clockwise rotational force is applied to both of them. In the state shown in FIG. 2 in which neither the left and right electromagnetic coils 39A, 39B are energized, the left and right switching rotary bodies 2
The locking protrusions 29A, 29B on the inside of the locking members 31A, 31B come into contact with the stopper pins 36A, 36B of the locking members 31A, 31B, respectively, and both rotating bodies 25A, 25
In both cases, the cutout portions 26A and 26B are opposed to the main drive gear 15 of the main drive rotation unit 3, and are kept in a non-engaged state with respect to the main drive rotation unit 3. Further, for example, the left electromagnetic coil 39A is energized to lock the locking member 31.
When A is rotated as shown in FIG. 8, the stopper pin 36A disengages from the inner locking protrusion 29A, and the switching rotary body 25A rotates slightly clockwise due to the pressing force of the rod spring 40A, and is connected to the main drive gear 15. mesh. Therefore, as the main drive gear 15 rotates counterclockwise, the switching rotary body 25A rotates clockwise. As shown in FIG. 9, the outer locking protrusion 30A comes into contact with the stopper pin 33A of the locking member 31A, and a clockwise rotational force is applied by the bar spring 40A. It will stop in the same state. Similarly, if the right electromagnetic coil 39B is energized,
As shown in FIG. 12, the locking member 31B rotates, the stopper pin 36B is disengaged from the inner locking protrusion 29B, and the switching rotary body 25B rotates slightly clockwise due to the pressing force of the rod spring 40B, and the main drive gear 15 meshes. Then, it is driven by the main drive gear 15 and rotates clockwise about one turn, and when it comes off the main drive gear 15, the outer locking protrusion 30B is brought into contact with the stopper pin 33B as shown in FIG. 13, and the rod spring 40B Stops with clockwise rotational force applied.

Next, on the upper surface side of the mounting plate 9, as shown in FIG. 3, the driving roller 12 of the driving rotating section 3 is arranged,
A pair of reel shafts 7A, 7B are rotatably attached to the left and right sides thereof, and driven rotating parts (rotating rollers) 8A, 8B are provided at the lower ends of each reel shaft.
Also, at a position slightly to the left of the mounting plate 9, two idlers 41 and 4 are installed as an idler mechanism 6A that transmits the rotation of the main driving roller 12 to the left driven rotation section 8A.
2, and one idler 4 is provided at a position on the right side of the mounting plate 9 as an idler mechanism 6B that transmits the rotation of the main driving roller 12 to the right driven rotation part 8B.
3 is provided. The idler 41 is an idler arm 4 rotatably mounted on the mounting plate 9.
4, and the rotation of this arm 44 causes it to move toward and away from the main drive roller 12. Note that a protrusion 44A is provided at the rotation end of the idler arm 44. The other two idlers 41 and 43 are both mounted on bearings 4 that are movable along guide grooves 45 and 46 formed in the mounting plate 9.
It is supported by 7,48. Each of these bearings 47, 48 has annular grooves 47A, 48A on the outer periphery as shown in FIG. 6, and protrusions 47B, 48B on the periphery of the upper surface. The annular grooves 47A and 48A are connected to each guide groove 45,
Each guide groove 45, 46 is fitted into both side edges of 46.
It is designed to reciprocate according to the shape of. When the left bearing 47 moves forward in FIG. It presses against the rotating part 8A to form a rotation transmission path from the driving roller 12 to the driven rotating part 8A as shown in FIG. 11, and as the driving roller 12 rotates counterclockwise, the left reel shaft Rotate 7A clockwise. Similarly, when the right bearing 48 moves forward in FIG. 3, the idler 43 supported by it comes into pressure contact with the main driving roller 12 and the right driven rotation part 8B, as shown in FIG. 15. A rotation transmission path is formed from the main roller 12 to the driven rotating section 8B, and as the main roller 12 rotates counterclockwise, the right reel shaft 7B is rotated in the same direction.

Further, on the upper surface of the mounting plate 9, a pair of left and right slide plates 49A and 49B are arranged. These slide plates 49A and 49B are both movable forward and backward in the front and rear directions in FIG. 3, and the left slide plate 49A and the left switching rotary body 25A constitute the left switching operation section 5A. and the right slide plate 4
9B and the right switching rotary body 25B constitute a right switching operation section 5B. Each slide plate 49A, 49B has an inclined edge 50 on the inner front part.
A, 50B have pressure receiving pins 51A, 51B protruding toward the lower surface side of the mounting plate 9 at the center portions, respectively, and bar springs 52A, 52B are attached to each bar spring 5.
The respective projections 47B, 48B of the bearings 47, 48 are pressed forward with the free ends of the bearings 2A, 52B, and the bearings 47, 48 are moved to the slide plate 49
It is brought into contact with A and 49B from the rear. Moreover, each slide plate 49A, 49B has a spring 53A,
53B in the rearward direction in FIG. 3, thereby causing the pressure receiving pins 51A, 51B to contact the rotating cams 27A, 27B from the front. Further, the left slide plate 49A is connected to each protrusion 44A, 47 of the idler arm 44 and the bearing 47.
B is pushed backward to separate the idlers 41 and 42 from the driving roller 12 and the driven rotating section 8A, respectively, and the right slide plate 49B
Press the protrusion 48B of 8 in the rearward direction to release the idler 43.
is spaced apart from the main driving roller 12 and the driven rotating section 8B.

Further, a pair of left and right braking mechanisms 54A and 54B are provided on the upper surface of the mounting plate 9 in front of the main drive roller 12. These braking mechanisms 54A, 54B
Brake shoes 57A, 57 made of rubber or the like are attached to each end of rotating arms 56A, 56B rotatably supported on the mounting plate 9 via shafts 55A, 55B.
A tension spring 59 is stretched between the other ends of both rotation arms 56A and 56B, and The elasticity of the brake shoes 57A, 57B is brought into pressure contact with the outer periphery of the driven rotating parts 8A, 8B, and the reel shaft 7
Rotation of A and 7B is prohibited. Also, an engagement pin 60 is attached to a part of the left rotation arm 56A.
A, a part of the right rotating arm 56B is provided with a bifurcated portion 60B that sandwiches the engagement pin 60A, and the engagement between the engagement pin 60A and the bifurcated portion 60B causes both the rotation arms 56A, 56B to are designed to rotate in conjunction with each other.

Next, the operation of this mode switching device will be explained.

First, if you want to switch the tape recorder from a stopped state to a tape rewinding state, you can energize the left electromagnetic coil 39A, and if you want to change it to a tape fast forwarding state, you can energize the right electromagnetic coil 39B.

For example, when switching to the rewinding state, drive the motor 2 shown in FIG. 5 to rotate the main rotating part 3 counterclockwise, and energize the left electromagnetic coil 39A from the state shown in FIG. As described above, the locking member 31A is attracted to the yoke 38A, the stopper pin 33A is disengaged from the inner locking protrusion 29A, and the switching rotary body 25A rotates slightly clockwise as shown in FIG. It meshes with the main drive gear 15.
Thereupon, the switching rotary body 25A rotates about one rotation driven by the main drive gear 15, and when it comes off the main drive gear 15 again, as shown in FIG.
is brought into contact with the stopper pin 33A and stopped. During the above operation, the rotary cam 27A provided on the switching rotary body 25A moves the contact position with respect to the pressure receiving pin 51A from the minimum radius portion to the maximum radius portion,
The slide plate 52A is moved forward from the position shown in FIG. 3 to the position shown in FIG. 10 against the force of the spring 53A. Therefore, as the slide plate 52A moves forward, the left rotating arm 56A moves toward the inclined edge 50A.
The left brake shoe 57A
is separated from the driven rotating portion 8A. At the same time, the right brake shoe 57B is also separated from the driven rotating portion 8B. Further, the rod spring 52A attached to the slide plate 52A presses the protrusion 47B of the bearing 47, so that the idler 42 moves forward according to the shape of the guide groove 45, and as shown in FIG. A transmission path leading to the rotating portion 8A is formed. Therefore, the rotation of the driving roller 12 is transmitted to the left reel shaft 7A via the idlers 41 and 42, and the reel shaft 7A rotates clockwise to perform tape rewinding operation. Next, if you want to stop this rewinding operation, stop energizing the left electromagnetic coil 39A and stop the locking member 31A.
from the position shown in Fig. 9 to the position shown in Fig. 2.
Then, the stopper pin 33 of the locking member 31A
Since A is removed from the outer locking protrusion 30A, the switching rotary body 25A rotates slightly again by the elasticity of the bar spring 40A, bringing the inner locking protrusion 29A into contact with the stopper pin 33A and moving to the position shown in FIG. Stop at.
Then, due to the slight rotation of the switching rotary body 25A, the pressure receiving pin 51A is removed from the maximum radius portion of the rotary cam 27A, and the slide plate 49A is pulled by the spring 53A and returns to the position shown in FIG. 3. Then, the slide plate 49A returns to this state. And slide plate 49A
During this return operation, the idlers 41 and 42 are separated from the main driving roller 12 and the driven rotating part 8A, respectively, and the rotating arm 56A is released, and both brake shoes 57A and 57B are moved to the left and right driven rotating parts 8.
A and 8B are pressed into contact with each other.

When switching from a stopped state to a fast forward state by energizing the right electromagnetic coil 39B, and the coil 39
The case where the fast forward operation is stopped by stopping the power supply to B is as follows. First, when the right electromagnetic coil 39B is energized in the state shown in FIG. 2, the locking member 31B rotates and the stopper pin 33B is disengaged from the inner locking protrusion 29B. Therefore, the switching rotor 2
5B first rotates slightly due to the elasticity of the rod spring 40B and meshes with the main drive gear 15 as shown in FIG. The outer locking protrusion 30B is brought into contact with the stopper pin 33B and stopped. On the other hand, due to the rotation of the rotary cam 27B provided on the switching rotary body 25B, the slide plate 52
B moves forward from the position shown in FIG. 3 to the position shown in FIG.
57B is spaced apart from the driven rotating parts 8A and 8B, and the rod spring 52B is attached to the slide plate 52B.
Press the protrusion 48B of the bearing 48 to release the idler 43.
is moved forward to form a transmission path from the main driving roller 12 to the driven rotating section 8B as shown in FIG. Therefore, the rotation of the driving roller 12 is transmitted to the right reel shaft 7B via the idler 43,
The reel shaft 7B rotates counterclockwise to perform tape fast forwarding operation. Next, coil 3
9B is stopped, and the locking member 31B is
When the stopper pin 33B is returned from the position shown in the figure to the position shown in FIG. Stoppin 3
3B and stop at the position shown in Figure 2. As a result, the pressure receiving pin 51B falls from the maximum radius part to the minimum radius part of the rotating cam 27B, and the slide plate 49
B is pulled by the spring 53B and returns to the position shown in FIG.
6B and both brake shoes 57A, 57B.
are again brought into pressure contact with the left and right driven rotating parts 8A, 8B.

According to the mode switching device described above, since the rotational force of the capstan drive motor 2 is used to perform fast forwarding, rewinding, etc., a dedicated drive source for the mode switching device is not required, and power consumption is reduced. The increase in size can be suppressed, the configuration can be simplified, and the size and weight can be reduced. In addition, the longitudinal and cross-section of the rotation transmission path from the main drive rotating section 3 to the reel shafts 7A or 7B and the engagement and disengagement of the braking mechanism with respect to the reel shafts 7A and 7B are simultaneously performed by a common slide plate 49A or 49B. In this respect as well, the configuration is simplified, and the vertical and
The disconnection and engagement and disengagement of the braking mechanism can always be performed at a constant timing. Idler mechanism 6
A, 6B as appropriate, the main rotating part 3 and the driven rotating part 8
Since it is inserted between A and 8B,
Normally, no load is applied to the motor 2, and the same motor is used to drive the capstan 1 and the mode switching device, but this does not cause uneven rotation of the capstan 1, which does not affect the performance of the tape recorder. It is possible to achieve the intended purpose without causing any problems.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the principle of the present invention, Figs. 2 to 15 show an embodiment of the invention, Figs. 2 and 3 are plan views showing partial configurations, and Fig. 4 is a longitudinal section. 5 is a plan view showing a partial configuration, FIG. 6 is a partial perspective view, FIG. 7 is a longitudinal sectional view, and FIGS. 8 to 15 are partial plan views for explaining the operation. DESCRIPTION OF SYMBOLS 1... Capstan, 2... Motor, 3... Active rotation part, 4, 4A, 4B... Trigger device, 5...
...Switching operation unit, 6, 6A, 6B... Idler mechanism, 7, 7A, 7B... Reel shaft, 8, 8A, 8
B...Followed rotating part, 25A, 25B...Switching rotary body, 26A, 26B...Notch part, 27A, 27B
... Rotating cam, 31A, 31B ... Locking member, 3
7A, 37B...Electromagnet, 40A, 40B...Bar spring, 49A, 49B...Slide plate, 54A,
54B...braking mechanism.

Claims (1)

[Claims] 1 Located approximately equidistant from the left and right reel axes,
A single main gear that is driven by a capstan drive motor and constantly rotates, a pair of driven gears that are provided on left and right reel shafts and rotate the corresponding reel shafts, and the main drive gear and either of the driven gears. two sets of single or plural idler gears that are selectively inserted between the main drive gear and transmits the rotational force of the main drive gear to either reel shaft, and a braking mechanism that simultaneously prohibits the rotation of both of the driven gears; A pair of partially toothed gears having tooth portions and cam portions and disposed on the left and right sides of the main driving gear, and a pair of engagement gears that hold each partially toothed gear so that each partially toothed portion faces the main driving gear. a locking means, an elastic biasing means for applying a rotational force to each partially toothed gear to a position where it meshes with the main drive gear, and an FF mode trigger means for releasing one of the locking means in response to an FF operation signal. , a rewind mode trigger means for releasing the locking means of the other locking means in response to a rewind operation signal, and as the toothless gears rotate, their cam portions engage with each other on the left and right sides of the main driving gear, respectively. A pair of cam follower/slide plates that move in one direction to release the state in which rotation of the pair of driven gears is inhibited by the braking mechanism are connected, and each cam follower/slide plate and a corresponding set of idler gears are connected to each other. A mode switching device for a tape recorder, comprising elastic coupling means for moving the idler gear between the main driving gear and the driven gear when the slide plate moves in one direction.