JPS58105B2 - Takuichisen Taxouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for alternatively operating a mode switching mechanism of an actuated element having a relatively large load, such as a video tape recorder.

Mechanical or electrical selection devices are well known.

In the electric alternative selection device, the actuated element is actuated by an electromagnetic plunger, so even under heavy loads, there is no reaction to the push button, and so-called soft-touch operation is possible, which is effective.

However, on the other hand, it requires a large amount of instantaneous electric power, making it large and expensive, and also generates loud mechanical noise, making it impractical.

In particular, the current situation is that it cannot be used as a means for changing modes (fast forwarding, stopping, playing, etc.) of a video tape recorder.

Therefore, mechanical alternative selection devices are generally employed in these devices.

However, the mode switching element (actuated element) in the above-mentioned equipment imposes a significantly large load, unlike an audio-only tape recorder.

Therefore, the pressing force and stroke of the operation push button become significantly large, resulting in an inconvenience.

Another disadvantage is that the mechanical noise generated during operation is significantly louder.

The device of the present invention has succeeded in eliminating the above-mentioned drawbacks, and uses the press of a push button as a trigger, so only a small pressing force is required, controls the output of the electric motor, and uses this output to quietly operate the actuated element. This feature provides a simple and trouble-free alternative selection device that operates.

Next, details of the apparatus of the present invention having the above-mentioned features will be explained with reference to FIG. 1 and subsequent figures.

In FIG. 1, the dotted line 1 indicates an electric motor, which is a capstan motor of a video tape recorder.

An idler wheel 6 is provided so as to be able to move toward and away from the rotating shaft 2.

Details of this vicinity are shown in FIG. 2, and will be explained in conjunction with FIG.

The lever 3 is rotatably supported together with a sleeve 3a by a rotational main shaft 4 supported by a support 10 provided on the main body, and is lightly resilient in the direction of arrow B by a spring (not shown).

A support shaft 5 provided on the lever 3 rotatably supports an eccentric idler wheel 6 and a gear 7 that are integrally formed.

The gear 9 is fixed to the rotating main shaft 4 and meshes with the gear 7.

The lever 31 is supported by a support shaft 31-1 provided on the main body, is resiliently repelled in the direction of arrow C, and is prevented from rotating by a restraining pin 31a.

The lever 32 is supported on a support shaft 32-1 that is mounted on the lever 31, and is resiliently repelled in the direction of the arrow by a spring (not shown).

The free end of the lever 31 abuts against the lever 3 and is also connected to the actuator 30a of the electromagnetic plunger 30.

The right end of the rotating main shaft 4 is supported by a support 10a provided on the main body.

When a pulse-like electrical input is applied to the electromagnetic plunger 30, the actuator 30a is attracted and the lever 31 rotates clockwise, so that the lever 3 is unlocked.

Therefore, the idler wheel 6 lightly contacts the rotating shaft 2 and begins to rotate.

Since the rotating shaft 200 rotates between the arrows, the gear 7 rotates clockwise.

When the load on the rotating main shaft 4 increases, the lever 3 receives clockwise torque as a reaction, and the idler wheel 6 further pushes the rotating shaft 2.
Since it is pressed against the shaft, there is no slippage and the power transmission is ensured.

Therefore, in the initial stage, the force for releasing the locking of the lever 3 by the lever 31 is also small, and the electromagnetic plunger 30 is small and requires only a small input electric pulse.

When the idler wheel 6 makes almost one rotation, the lever 3 also makes one reciprocation,
It comes into contact again with the free end of the lever 31 which has already returned.

Furthermore, due to the slight rotation of the idler wheel 6, the point of the minimum radius of the idler wheel 6 faces the rotating shaft 2, so that the idler wheel 6 is automatically separated and stopped.

As understood from the operation described above, the electromagnetic plunger 3
Each time there is an input to 0, the gear 9 is rotated by a predetermined angle.

Even if the idler wheel 6 rotates once, the lever 31 still operates as the actuator 30a.
If it is attracted by the electromagnetic plunger 300, that is, if the electromagnetic plunger 300 is energized for a long time, the idler wheel 6 will continue to rotate.

In order to prevent such inconvenience, it is sufficient to input a differential pulse to the electromagnetic plunger 30, but the lever 3 shown in the second figure
2 can also eliminate this inconvenience.

When the lever 31 continues to rotate clockwise, the lever 32 rotates clockwise and is held in close contact with the portion 3Ib.
automatically stops when it comes into contact with the free end of the

Therefore, the above-mentioned disadvantages can be eliminated.

After this, when the electromagnetic plunger 300 is de-energized, the lever 31 rotates counterclockwise and returns to its original position.
comes into contact with the lever 31, and the lever 32 leaves to the left and assumes the position shown in the figure, ready for the next operation.

Therefore, the gear 9 can be rotated by a predetermined angle with either long or short input electric pulses.

In the case described above, the idler wheel 6 rotates once at a time, but the object of the present invention can also be achieved even if the idler wheel 6 is configured to rotate by 2.3 degrees and then stop.

For this purpose, for example, the gear 9 is provided with a reduction gear train, and the gear at the end thereof is provided with a rotary switch that continues to energize the electromagnetic plunger 30. Before this gear rotates once, the electromagnetic plunger 300 is energized. You can achieve your goal by cutting it off.

The purpose can also be achieved by providing a monostable circuit and energizing the electromagnetic plunger 30 for a predetermined period of time using an input electric pulse.

Next, the eccentric idler wheels 14, 15 in FIG. The vicinity of ... will be explained.

Since these mechanisms are all the same, the vicinity of one of them, the idler wheel 14, will be explained in detail with reference to FIG.

The symbol 11 is a rotating ring fixed to the rotating main shaft 4, as shown by the same symbol in FIG.

The eccentric idler wheel 14 is supported by a support shaft 18 mounted on a lever 17, so that it can move toward and away from the rotating wheel 11.

The lever 17 is rotatably supported by a support (shaft bearing) 16 provided on the main body 33, and clockwise torque is applied by a spring 17a.

A crank lever 19 is connected to the rotation support shaft 18 of the idler wheel 140, and a load 24 is provided at the right end of the crank lever 19.

This load is, for example, a lever mechanism for converting to stop mode, which is a large load.

A push button rod 39 connected to the push button 35 is slidably supported by supports 38a and 38b provided on the main body, and a spring 3
It is repelled upward by 9c.

Symbol 38c is a restraining pin for restraining its upward sliding.

The right end 39b of the push button rod 39 abuts the lever 17, and the 39
The a part is in contact with the free end of the rotating plate 40.

The rotating plate 40 is rotatably supported by the main body by a support shaft 40-1, and is lightly resilient in the direction of arrow E.

On the lower surface of the rotating plate 40, an actuator 41 of an electric switch 41 is provided.
When the rotary plate 40 rotates counterclockwise and presses the actuator 41a, the electric switch 41 is closed.

The rotating plate 40 is configured to close the electric switch 41 when the push button 35 and the push button rod 39 are pressed and lowered, but since the rotating plate 40 has a wide width in the lateral direction, , symbols 35a, 35c other than push button 35 in FIG.
Even if you press any of the push buttons shown in , the electric switch 40
is now closed.

When the electric switch 40 is closed, the electromagnetic plunger 30 shown in FIG. 2 is configured to be energized, so the rotating shaft 4 and rotating wheel 11 rotate by a predetermined angle and then stop.

At the same time, the locking of the lever 17 by the portion 39b is released, so that the lever 17 rotates counterclockwise.

Therefore, the rubber ring around the idler wheel 140 comes into contact with the rotary wheel 11 and begins to rotate.

The arrows in the drawing indicate the rotation directions of the rotating wheel 11 and the idler wheel 14.

The crank lever 19 pushes the load 24 to the right, but since there is almost no reaction from the load at the time of initial movement, the spring 1
Even if the pressing force between the idler wheel 14 and the rotating wheel 11 by 7a is small, no slipping occurs.

Therefore, by pressing the push button 35, the push button rod 39 moves to the lever 1.
It has the feature that the force required to release the lock of 7 is very small.

When the idler wheel 14 rotates, the crank lever 19 moves to the right to actuate the load 24, which is an actuated element, but due to the reaction, the idler wheel 14 is pressed even more strongly against the rotating wheel 11. .

Therefore, power is transmitted and rotates without slipping.

At the point where the idler wheel 14 has completed slightly more than half a turn, the rotating wheel 1
The diameter of each rotating part is set so that 1 stops.

Therefore, the idler wheel 14 stops at a position where the point beyond the maximum radius faces the rotating wheel 11.

At this time, naturally, due to the reaction of the load, the rubber ring around the periphery of the idler wheel 140 and the rotary wheel 11 are held in pressure contact with each other.

If this pressure is large and there is a risk that the rubber ring will deform if left for a long period of time, a protruding piece 34 is provided when the idler ring 14 is molded with plastic so that this part 34a comes into pressure contact with the rotating ring 11. Then, the rubber ring is slightly recessed, which has the effect of preventing the above-mentioned deformation.

As can be seen from the above explanation, the pressing force of the push button 35 is small, and even if the actuated element 24 is subjected to a large load, it does not slip and the actuation is effected quietly.

Next, when the push button 35 is further pressed, the electric switch 41 is closed, so that the rotary wheel 11 rotates again.

Therefore, the lever 17 returns to contact 39b of the push button rod 39 and further rotates by a slight angle, so that the lever 17 stops in the vicinity where the point of the minimum radius opposes the rotating wheel 11 and is separated from the rotating wheel 11.

The crank lever 19 also returns to its original position, and the operation of the actuated element 24 also returns to its original position.

In the above-described operation, it is necessary to rotate the idler wheel 14 slightly more than half a rotation due to the rotation of the rotary wheel 110.

Otherwise, an integral error will occur and the crank lever 19
This is because the points where the movement to the right ends are shifted sequentially, causing an inconvenience.

The above-mentioned extra rotation means that the rotary wheel 11 rotates freely and does not drive the idler wheel 14 after the lever 17 contacts the portion 39b.

).

Further, as described above, when the idler wheel 6 (shown in the second figure) rotates several times and then stops, the diameter of the rotary wheel 11 must be correspondingly reduced.

In the example described above, the electric switch 4 is moved using the rotary plate 40.
1 is closed and the electromagnetic plunger 30 is operated.

However, the electromagnetic plunger 30 and the electric switch 41 can also be omitted.

In this case, the configuration is as follows.

In other words, 400 rotations of the lever are transferred to the second lever via the lever link mechanism.
When connected to the lever 31 in the figure and pressed the push button 35,
The same objective can be achieved by pressing lever 31 via lever 40 and causing it to rotate clockwise.

Also, instead of pressing the push button 35, when the excitation coil 37a is energized, the magnetic core 37 (fixed to the main body) is activated.

) is fixed to the lower surface of the push button 35.

), the push button rod 39 is lowered and the actuated element 24 can be actuated.

Therefore, for example, by introducing a detection pulse when the magnetic tape is completely wound onto one reel into the excitation coil 37a, it is possible to switch to the stop mode.

A feature is that only a small amount of current is required to flow through the excitation coil 37a.

Although a rotating lever is used as the lever 17, the object of the present invention can also be achieved by using a sliding lever that allows the idler wheel 14 to move left and right.

Furthermore, by half a rotation of the idler wheel 140, the operated element 24 is actuated via the crank lever 19. A rotary cam that rotates in synchronization with the idler wheel 14 is provided, and the actuated element is actuated via a lever that slides in contact with this rotating cam. The same purpose can be achieved by operating .

When the idler wheel 14 shown in FIG. 3 rotates half a rotation and the actuated element 24 is in the operating state, the idler wheel 15 shown in FIG.
The above-mentioned members have exactly the same functions and effects as the members corresponding to FIG. 3, and are adapted to actuate the actuated element 25 via the crank lever 22.

), when the push button 35a is pressed, the idler wheel 14 rotates half a turn and automatically stops.

This state is illustrated in FIG.

Therefore, the actuated element 25 is activated, but at the same time, the idler wheel 14 is also rotated approximately half a turn by the rotary wheel 11, so that the lever 17 is engaged with the portion 39b of the push button rod 39 and automatically stops.

That is, the actuated element 24 automatically returns, and the actuated element 25
is activated, which means that an alternative selection has been made.

In FIG. 1, the mechanism indicated by the dotted line 23 is driven by the rotary wheel 13 and is provided to operate the actuated element 26 by the push button 35C, and has exactly the same structure as the mechanism shown in FIG. 3. be.

Therefore, it is clear that the actuated element 26 can be alternatively actuated by pressing the push button 35c.

It is clear that a plurality of such drive systems can be provided on the rotating main shaft 4 instead of just the three described above.

As can be seen from the above description, the apparatus of the present invention achieves the object stated at the beginning and is highly effective.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the entire apparatus of the present invention, FIG. 2 is an explanatory diagram of the drive system of the rotating main shaft 4, and FIG. 3 is a detailed explanatory diagram of the drive system of one actuated element. 1... Electric motor, 2... Rotating shaft, 3... Lever, 4... Rotating main shaft, 5... Support shaft, 6, 14, 15... Eccentric idler wheel,
7, 9... Gear, 10, 10a... Support, 11, 12
, 13...Rotating wheel, 16° 38a, 38b, 20...
Support body, 17, 21... Lever, 18... Support shaft, 34...
... Projection piece, 19 ... Crank lever, 23 ... Drive system,
24゜25.26...Actuated element serving as load, 30...
Electromagnetic plunger with actuator 30a, 32°31...
Lever, 31-1, 32-1, 40-1... Support shaft, 33
...Main body, 35, 35a, 3sb...Push button, 39...Push button rod, 39c, 17a...Spring, 41...Electric switch, 40...Rotating plate, 37a...Excitation coil, 37
...Magnetic core, 36...mild steel plate.

Claims (1)

[Claims] 1. A rotating main shaft that is driven by an electric motor via a trigger input, rotates by a predetermined number of rotations and automatically stops, and is supported by a support member so as to be able to come into contact with and separate from the rotating main shaft,
A plurality of eccentric idler wheels resiliently repelled in a direction tangent to the rotational main shaft, and a plurality of eccentric idler wheels that lock each of the idler wheels at a position where the point of their minimum radius faces the rotational main shaft. a locking member, a mechanism for releasing the locking action of each locking member on a corresponding idler wheel through pressing a push button, a device from which the aforementioned trigger receives an input in synchronization with depression of the push button, and each idler wheel. is rotated in contact with the rotating main shaft, and when the rotating main shaft rotates at a predetermined number of rotations, the idler wheel rotates approximately half a turn and automatically stops, the movement of the rotating shaft due to the rotation of the idler wheel. At this time, the actuated element is actuated and the idler wheel, which was in pressure contact with the rotating main shaft at a point near the maximum radius of the idler wheel, rotates further. An alternative selection device characterized by comprising a mechanism in which the actuated element is automatically stopped by being locked by the corresponding locking member described above and also returns the actuated element.