JPS6213250Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational force transmission device that can be suitably applied to a fast forwarding and rewinding mechanism of a tape recorder.

Up until now, if we look at the fast forward and rewind mechanisms of commercially available tape recorders, we find that a plurality of transmission levers move against the biasing force of a spring in accordance with the operation of each operation button. The transmission gear meshes with the supply or take-up reel stand and transmits rotational force thereto.

However, in the case of such a conventional rotational force transmission device for a tape recorder, it is necessary to operate many transmission levers by operating operation buttons in order to engage the transmission gear with the supply or take-up reel stand. Therefore, a considerable amount of operating force is required to operate the operation button, resulting in poor operability.

The present invention was developed in view of the shortcomings of the conventional devices, and simply by releasing the locking operation of the locking means by operating the operating member, the device automatically switches to a predetermined mode and reduces the rotational force of the drive source. It is an object of the present invention to provide a rotational force transmission device for a tape recorder that can control transmission to a driven vehicle.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing a stop mode of a tape recorder equipped with an embodiment of a rotational force transmitting device according to the present invention, and FIG. 2 is a side view showing a side view of the same main part.

In these figures, 1 and 2 are chassis 17
A supply and take-up reel stand pivoted on the
Gear portions 3 and 4 are provided on the periphery of each of them via a slip mechanism.

Note that a reversing gear 5 is meshed with the gear portion 3 of the supply reel stand 1.

6 and 7 are a transmission gear and a drive gear that can mesh with each other, and the drive gear 7 is connected to a drive shaft 12 that is pivotally supported on a chassis 17 with a bearing 16 in the midsection between the two reel stands 1 and 2. It is fixed to the middle of the upper end projecting on the chassis 17, and
On the other hand, the transmission gear 6 is connected by a pivot shaft 11 to a second lever 9 which is connected by a pivot shaft 10 to a first lever 8 which is pivotally attached to the upper end of the drive shaft 12 and is prevented from coming off by a stopper 12a. The transmission gear 6 is configured to rotate around the drive gear 7, that is, revolve around the drive gear 7, as the first lever 8 rotates around the drive shaft 12.

Reference numeral 19 designates a friction spring pivotally supported on the drive shaft 12 between the drive gear 7 and the first lever 8, which transmits the rotational force of the drive gear 7 to the first lever 8, so that the transmission gear 6 and the transmission gear 6 move in the same direction. It is designed to be rotated.

It should be noted that a special structure is adopted for the connecting portion of the first and second levers 8 and 9.

That is, the second lever 9 is provided with a regulating protrusion 9a, while the first lever 8 is provided with an engaging protrusion 8a that can engage with the regulating protrusion 9a.
The second lever 9 can change its angle of elevation with respect to the first lever 8 within the angle until the engagement protrusion 8a engages with the second lever 9.

Further, the direction in which the second lever 9 is bent with respect to the first lever 8 is the direction in which the second lever 9 is bent with respect to the first lever 8 .
When both levers are in a state where the protrusion 8a is in contact with the protrusion 9a as described above, the transmission gear 6 is not engaged with the drive gear 7. This state is taken during stop and play mode.

Numeral 13 is a drive motor, and its rotational force is transmitted to the drive shaft 12 by a belt 14 suspended between a pulley 13a provided on the motor shaft and a pulley 15 provided at the lower end of the drive shaft 12. There is.

Since the rotation direction of the motor 13 is counterclockwise, the drive shaft 12 and the drive gear 7 both rotate in the same counterclockwise direction.

Reference numeral 18 denotes a stop lock lever having an approximately inverted 7 shape, and is supported by a guide pin 17a provided on the chassis 17 so as to be slidable in the directions of arrows A and B in the figure, and a lock portion formed at one end. 18
A is always urged in the direction of arrow B by a spring 30 suspended between the chassis 17 and the chassis 17 so that the lever a can engage the lower end of the pivot shaft 11 (stop mode position).

Reference numeral 20 denotes a first guide member provided on the chassis 17 between the take-up reel stand 2 and the drive gear 7, and the surface on the drive gear 7 side is an arcuate guide surface 20a. The surface 20a guides the pivot shaft 11 which rotates around the drive shaft 12 together with the first lever 8.
Both are made of an arcuate surface with the midsection apex so as to prevent the transmission gear 6 from completely meshing with the gear portion 4 of the take-up reel stand 2 until the transmission gear 6 reaches a predetermined fast-forwarding position. 11 slides along this guide surface 20a and the guide surface 20
When reaching the terminal end 20' of a, the fast forward lock lever 21
When the transmission gear 6 comes into contact with the locking surface 21a of the transmission gear 7 and is locked at the fast forward position, the transmission gear 6 is brought into mesh with the drive gear 7 and the gear portion 4 so as not to bottom out.

The fast-forwarding lock lever 21 is composed of three legs that are pivotally supported on the pivot shaft 17b on the chassis 17, one of which has the locking surface 21a, and the other leg has the chassis 17 and the other leg has the locking surface 21a. A spring 29 is suspended between the legs, which constantly applies a clockwise rotational force to the other pair of shoes 21.
b with the push pin 25 at the tip of the fast-forward operation lever 25.
Such clockwise rotation is regulated by engaging with a.

Based on the operation of the fast-forward operation lever 25 in the direction of the arrow A, the fast-forward lock lever 21 is rotated counterclockwise until the lock surface 21a reaches a lock position capable of locking the pivot shaft 11 from the non-lock position shown in FIG. 1, and the operation of the fast-forward operation lever 25 is also controlled by the foot 2.
1b to the stop lock lever 18, and the lever 18 is slid in the direction of arrow A from the stop position to release the lock of the pivot shaft 11 by the lock portion 18a. Of course, when the pressing force of the fast-forward operation lever 25 is released, the original state is restored by the return force of the spring 29.

Now, the relationship among the pivot shaft 11, the first guide member 20, and the rapid-forward lock lever 21 will be described in a little more detail.

As is clear from FIG. 5, the lock surface 21a at the tip of the fast-forwarding lock lever 21
Angle θ from the side edge to the side edge of the take-up reel stand 2
It is formed on the downward slope of ₁ .

This angle θ ₁ means that the lock surface 21a is connected to the pivot shaft 1.
A line connecting the point P touching 1 and the center Q ₁ of the drive shaft 12
₁ , and the reason for having this angle θ ₁ is that the pivot shaft 11 is tilted from the locking surface 21.
This is because the pivot shaft 11 is pressed further toward the terminal end 20a' of the guide surface 20a of the first guide member 20 when it comes into contact with the guide surface 20a. In other words, this is to ensure that the transmission gear 6 meshes with the gear portion 4.

Also, the angle θ formed by the line ₂ connecting the rotation center Q ₂ of the fast-forwarding lock lever 21 and the above point P and the above line ₁
The reason for _this is that the fast forward lock lever 21 has an acute angle as described above.
When the spring 29 returns from the locked position to the original stop position in conjunction with the return of the fast-forward operating lever 25, the rotational force of the pivot shaft 11 assists the return by the spring 29. This is to allow the rotational force of the pivot shaft 11 to act on the fast-forwarding lock lever 21, thereby reducing the tensile force of the spring 29 and, in turn, reducing the operating force of the fast-forwarding operating lever 25. It can be reduced.

Also, as shown in the figure, when the pivot shaft 11 comes into contact with the locking surface 21a of the fast-forward lock lever 21 and is locked in the fast-forward position, the pivot shaft (transmission gear 6) 11
and the center of the drive shaft (drive gear 7) 12 Q ₁
and the center _Q3 of the take-up reel stand 4 are set so that the line ₁₃ is a straight line, and at this time, the pitch circles of each gear 4, ₆ , and 7 (circles indicated by dashed-dotted lines) touch each other. By doing so, each gear can mesh well with each other without bottoming out.

Reference numeral 22 designates a second guide member provided on the chassis 17 between the reversing gear 5 and the drive gear 7, and the surface on the drive gear 7 side is an arcuate guide surface 22a. Guide member 2
Reference numeral 2 has the same structure and function as the first guide member 20, and cooperates with the lock surface 23a of the rewind lock lever 23 to lock the pivot shaft 11 in the rewind position and drive the transmission gear 6. and the reverse gears 7 and 5 so that they do not bottom out.

The rewinding lock lever 23 is comprised of a substantially dogleg-shaped member pivotally supported by a pivot shaft 17c on the chassis 17, and has one end attached to the locking surface 23.
a, and is constantly given a clockwise rotational force by a spring 31 suspended between the other end and the chassis 17, and the protrusion 23b protruding from the other end is pushed by the rewind operation lever 26. pin 26
By engaging with a, the clockwise rotation is restricted.

The rewinding lock lever 23 is moved from the non-locked position as shown in FIG. 1 to the locking position in which the locking surface 23a can lock the pivot shaft 11 based on the operation of the rewinding operation lever 26 in the direction of arrow A. At the same time, the operation of the rewind operation lever 26 is transmitted to the stop lock lever 18 via the protrusion 23b, and the lever 18 is rotated from the stop position in the direction of arrow A. The pivot shaft 11 is unlocked by the lock portion 18a by sliding the pivot shaft 11.

Of course, if the pressing force from the rewind operation lever 26 is released, the original state is restored by the restoring force of the spring 31.

The relationship between the second guide member 22, the rewind lock lever 23, and the pivot shaft 11 is the same as the relationship between the first guide member 20, the fast-forward lock lever 21, and the pivot shaft 11 explained in FIG. 5 above. , a detailed explanation thereof will be omitted.

Reference numeral 24 designates a third guide member provided on the chassis 17 between the two reel stands 1 and 2, and has a guide surface 24a forming an upwardly inclined circular arc surface from the end (starting end) located on the supply reel stand 1 side. and the terminal end of the guide surface 24a is connected to the stop lock lever 1.
The pivot shaft 1 rotates from the direction of the second guide member 22.
1 to guide it into engagement with the lock portion 18a.

The above-mentioned fast forward and rewind operation levers 25 and 26
are guide pins 1 protruding from the chassis 17, respectively.
7d and 17e so as to be able to slide in the directions of arrows A and B, and is normally supported by a spring 33.
The lock pins 25b and 26b are respectively held in the non-operating position by pressing and sliding in the direction of the arrow A to lock the lock pins 25b and 26b into the lock pawls 28a and 28b of the lock plate 28, respectively.

27 is the stop operation lever 27 and the spring 3
5 is held in the non-operating position, and its operation releases the locking of the fast forward and rewind operating levers 25 and 26 by the lock plate 28.

Reference numeral 32 denotes a spring that biases the locking plate 28 in the locking direction.

The present invention is constructed as described above,
Next, its operation will be explained.

(1) About the fast forward mode The pivot shaft 11 is locked by the lock portion 18a of the stop lock lever 18 in the lock position, and the transmission gear 6 is placed in the center between both reel stands 1 and 2 without meshing with the drive gear 7. located, and
The fast forward and rewind lock levers 21 and 23 move the respective locking surfaces 21a and 23a to the first and second positions.
In the stop mode shown in FIG. 1, which is located at a position apart from the guide members 20 and 22, push the fast-forward operating lever 25 in the direction of arrow A to lock the lock pin 25.
When the lever 25 is moved in the direction of the arrow A, the push pin 25a rotates the fast-forwarding lock lever 21 counterclockwise against the spring 29. the lock surface 21a to the first
It is moved to the lock position close to the guide member 20. That is, it is moved within the rotation locus of the pivot shaft 11. Also, at the same time, stop lock lever 1
8 in the direction of arrow A against the spring 30, and the lock portion 18a is moved from the locked position shown in FIG.
to release the lock.

Then, as the pivot shaft 11 becomes free, the rotational force (counterclockwise in the figure) of the drive gear 7 already driven by the drive motor 13 is applied to the first lever via the friction spring 19. 8 and rotates the lever 8 counterclockwise.

As the first lever 8 rotates, the second lever 9 and the pivot shaft 11 both revolve around the drive gear 7 in the same direction, and the transmission gear 6 and the gear portion 4 of the take-up reel stand 2 are connected to each other. Move in the direction of engagement.

As this revolution progresses, the pivot shaft 11 engages the lock surface 21a of the fast-forward lock lever 21 and the first
When the guide member 20 is locked by the end of the guide surface 20a (see FIG. 5), the transmission gear 6 meshes with the drive gear 7 and the gear portion 4, and transfers the rotation of the gear 7 to the take-up reel stand 2. communicate,
The take-up reel stand 2 is rotated.

The tape recorder is now in the fast-forward mode shown in FIG. 3, and the take-up reel stand 2 winds the tape at high speed.

Note that during the mode conversion to the fast forward mode, the pivot shaft 11 moves along the guide surface 20a of the first guide member 20, so the pivot shaft 11 reaches the terminal end 20a' from the apex of the guide surface 20a. During this period, the take-up reel table 2 gradually rotates around the pivot shaft 10 as a fulcrum, and as a result, the transmission gear 6 gradually increases the degree of engagement with the gear portion 4, which reduces noise when the gears engage. will be less.

To change the fast-forward mode to the stop mode as described above, it is preferable to operate the stop operation lever 27 in the direction of arrow A to release the lock of the fast-forward operation lever 25 by the lock plate 28.

That is, the fast forward operation lever 25 is moved by the spring 3.
When the lock lever 21 is returned to the non-operating position with a force of 3, the pressing force of the push pin 25a against the fast-forward lock lever 21 and the stop lock lever 18 is deenergized, so that the fast-forward lock lever 21 is moved by the spring 29.
The return force of the spring 30 causes the lock surface 21a to move away from the terminal end 20a' of the guide surface 20a and return to the unlocked position outside the orbit of the pivot shaft 11, and the stop lock lever 18 is moved to the lock portion 18a by the return force of the spring 30. is returned to the locked position, which is within the orbit of the pivot shaft 11.

Therefore, by returning the fast-forward lock lever 21 to the unlocked position, the lock at the fast-forward position relative to the pivot shaft 11 is released, so that the first lever 8, the second lever 9, and the transmission gear 6 are moved by the friction spring 19. The rotational force of the drive shaft 12 obtained through the rotation causes the drive shaft 12 to revolve counterclockwise again, and the pivot shaft 11 is locked by the lock portion 18a of the stop lock lever 18, which is already waiting at the lock position, and the third guide member 24. As a result, the system returns to the stop mode shown in FIG.

In addition, in the middle of returning to this stop mode, the central support shaft 1
1 moves along the guide surface 22a of the second guide member 22, the transmission gear 6 revolves and momentarily meshes with the reverse gear 5, trying to rotate the gear 5 clockwise by its revolving force. At this time, it meshes with the drive gear 6 and rotates itself clockwise, and this rotational force also applies counterclockwise rotational force to the reversing gear 5, so the reversing gear 5 actually rotates by canceling out the revolving force and the rotational force. is not rotated by
Therefore, the supply reel stand 1 also does not rotate. Of course,
It is necessary to set the above revolution force and rotation force to be equal.

Further, since the pivot shaft 11 that has passed through the second guide member 22 in this manner moves along the guide surface 24a of the third guide member 24, the lock portion 18
It is conveniently guided so as to come into contact with a.

(2) About the rewind mode Next, in the stop mode shown in FIG. By moving the rewinding lock lever 23 in the direction of arrow A, the push pin 26a locks the rewinding lock lever 23 into the spring 3.
Rotate counterclockwise against lock surface 2.
3a is moved to a locked position close to the second guide member 22. That is, it is moved within the rotation locus of the pivot shaft 11. At the same time, the stop lock lever 18 is moved in the direction of arrow A against the spring 30.
The lock portion 18a is moved from the locked position shown in FIG. 1 to the unlocked position to release the lock of the pivot shaft 11.

Then, as the pivot shaft 11 becomes free, the rotational force (counterclockwise in the figure) of the drive gear 7 already driven by the drive motor 13 is applied to the first lever via the friction spring 19. 8 and rotates the lever 8 counterclockwise.

As the first lever 8 rotates, the second lever 9 and the pivot shaft 11 revolve around the drive gear 7 in the same direction, and the transmission gear 6 meshes with the gear portion 3 of the supply reel stand 1. Move in the direction you want.

Then, as this revolution progresses, the pivot shaft 11 connects with the lock surface 23a of the rewinding lock lever 23.
When the guide member 22 is locked by the end of the guide surface 22a, the transmission gear 6 meshes with the drive gear 7 and the reversing gear 5 to transmit the rotation of the gear 7 to the supply reel stand 1. Rotate at high speed.

The tape recorder is now in the rewind mode shown in FIG. 4, and the supply reel stand 1 rewinds the tape at high speed.

In addition, during mode conversion to this rewinding mode, the center support shaft 11 touches the guide surface 2 of the first guide member 20.
While moving along 0a, the transmission gear 6 momentarily meshes with the gear part 4 as it revolves and attempts to rotate the gear part 4 clockwise by its revolving force.
At this time, it meshes with the drive gear 6 and rotates itself clockwise, and this rotational force also applies a counterclockwise rotational force to the gear section 4, so that the gear section 4 actually rotates due to the cancellation of the revolving force and the rotational force. Therefore, the take-up reel stand 2 also does not rotate. Of course, it is necessary to set the above-mentioned revolution force and rotation force to be equal.

In order to change to the stop mode in the rewind mode as described above, it is preferable to operate the stop operation lever 27 in the direction of arrow A to release the lock of the rewind operation lever 26 by the lock plate 28.

That is, the rewind operation lever 26 is
When the rewind lock lever 23 is returned to the non-operating position with a force of 4, the pressing force exerted by the push pin 26a on the rewind lock lever 23 and the stop lock lever 18 is deenergized.
With the return force of the spring 30, the locking surface 23a and the guide surface 22a are separated from the end 22a' and returned to the non-locked position outside the orbit of revolution of the pivot shaft 11, and the stop lock lever 18 is moved to the lock portion 18a with the return force of the spring 30. is returned to the locked position, which is within the orbit of the pivot shaft 11.

Therefore, by returning the rewind lock lever 23 to the non-locked position, the lock at the rewind position relative to the pivot shaft 11 is released, so that the first lever 8, the second lever 9 and the transmission gear 6 are moved by friction. The rotating force of the drive shaft 12 obtained through the spring 19 causes the drive shaft 12 to revolve again in the counterclockwise direction, and the pivot shaft 11 is locked by the lock portion 18a of the stop lock lever 18, which is already waiting at the lock position, and the third guide member 24. By doing so, the stop mode shown in FIG. 1 is returned to.

Note that during the return to the stop mode, the pivot shaft 11 that has passed through the second guide member 22 moves along the guide surface 24a of the third guide member 24, so it is conveniently positioned so that it comes into contact with the lock portion 18a. be guided.

Since the present invention is constructed as described above, the mode can be switched by simply releasing the locking operation of the lever means, and therefore there is no need for a large number of lever means as in the past, and the number of parts is reduced. It is easy to assemble and can be manufactured at low cost.

Moreover, since the lever means is displaced from the first state to the second state by sliding a part of the rotating lever means into sliding contact with the guide means, the lever means is moved from the first state to the second state. The displacement of the state is reliably carried out, and in addition, the number of members required for this displacement is as small as possible, and in this respect as well, it is an excellent device that can be manufactured at low cost.

[Brief explanation of the drawing]

1, 3, and 4 are plan views showing stop, fast forward, and rewind modes of a tape recorder equipped with an embodiment of the rotational force transmission device according to the present invention, and FIG. 2 is the same as above. FIG. 5, a side view of the main part of the tape recorder, is a diagram illustrating a state in which the pivot shaft of the rotational force transmitting device according to the present invention engages with both the guide member and the lock lever. 1, 2: Supply reel stand (take-up reel stand), 6:
Transmission wheel, 7: Drive wheel, 8, 9: First (second) lever, 11: Pivot shaft, 12: Drive shaft, 20: First guide member, 22: Second guide member, 21: Rapid feed lock lever, 23: Rewind lock lever.

Claims (1)

[Scope of utility model registration request] A driving wheel, a transmission wheel, and a shaft supporting the driving wheel so that the transmission wheel pivotally connected to the tip thereof revolves around the driving wheel, and the transmission wheel is not engaged with the driving wheel. a second condition that engages the first condition;
lever means displaceable to take the state of
lever pivoting means for rotating said lever means about said axis; first and second locking means for locking said lever means to hold said transmission wheel in first and second spaced positions about said drive wheel; The lever means comprises a second locking means, a driven wheel disposed near the second position, and a guide means disposed immediately before the second position on the outgoing path of the transmission wheel; In the first position, the transmission wheel is not engaged with the drive wheel by taking the first state, and the first locking means is unlocked from the first position, and the lever rotation means is in the first state. rotated about the axis by the second locking means.
When the transmission wheel is locked in the second position, the transmission wheel is engaged with the driving wheel and the driven wheel by taking the second state, and the guide means is configured to move the lever means together with the transmission wheel from the first position to the first position. 2. A rotational force transmitting device characterized in that when the lever means is rotated to the second position, the lever means is displaced to the second state.