JPH0634000A - Device for transferring rotation - Google Patents

Abstract

PURPOSE:To provide an angled, simple structure in the device stated in the title for use in a drive mechanism for the reel stopper of a tape recorder by providing between a main gear and each gear of the reel stopper a first intermediate rotor having an external and internal gear and a second intermediate rotor having two kinds of coaxial external gears, and selectively controlling engagement of intermediate gears. CONSTITUTION:A first intermediate rotor 21 having an external gear 22 and an internal gear 23 is provided between each of the reel gears 11, 12 of a reel stopper and the capstan gear 1 of a flywheel 3 and the external gear 22 is allowed to be selectively engaged with the reel gear 11. A second intermediate rotor 31 having coaxial external gears 32, 33 is disposed within the first intermediate rotor 21 and the external gears 32, 33 are so disposed that they can be selectively engaged with the internal gear 23 of the first intermediate rotor 21 and the reel gear 12, respectively. Gear engagement is selectively switched among a combination of the main gear 1, the external teeth 22 of the first rotor 21 and the reel gear 11, a combination of the inside 23 of the first intermediate rotor 21 and the outside 32 of the second intermediate rotor 31, and a combination of the external teeth 33 and the reel gear 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact rotation transmission device suitable for use as, for example, a reel receiving drive mechanism of a tape recorder.

[0002]

2. Description of the Related Art In a tape recorder, a reel receiver is rotationally driven at a constant low speed to run the tape at a constant speed (recording / playback mode), or the reel receiver is rotationally driven at a high speed to run the tape at a high speed. The operation (fast forward / rewind mode) is performed. For example, as disclosed in Japanese Utility Model Laid-Open No. 2-60993, the rotation of the caps, which is rotationally driven by a motor at a constant high speed, is used to rotate the reel receiver. This is performed by selectively decelerating and transmitting to a reel receiver through a rotation transmission system for high speed rotation.

Such a rotation transmission mechanism, for example, is always meshed with a capstan gear which is coaxially integrated with a capstan, and two reel gears of different sizes, which are different in diameter (number of teeth), are coaxially provided in a reel receiver. Two intermediate gears that selectively mesh are provided. In this case, the small-diameter reel gear is provided coaxially with the reel receiver for high-speed rotation, and the large-diameter reel gear is for constant-speed rotation, and is generally rotatable integrally with the reel receiver via a friction transmission mechanism. It is provided in.

[0004]

By the way, the rotation of the capstan gear is selectively changed by the intermediate gear, and the large or small size 2 described above is obtained.
The difference in reduction ratio when transmitting to one reel gear is determined only by the diameters of the two large and small reel gears because the modules of each gear are constant. Therefore, in order to increase the reduction ratio difference, it is necessary to make the diameters of the two large and small reel gears largely different. However, in tape recorders for tape cassettes, the positional relationship between the capstan and the reel receiver is fixed by the size and shape of the tape cassette, so there is a limit to widening the difference in diameter between the reel gears. is there.

As a means for solving such a problem, it is conceivable to change one of the intermediate gears to a reduction gear having a coaxial large and small two-stage structure to increase the reduction ratio between the capstan gear and the reel gear. However, it is unavoidable that the diameter of the reduction gear of the coaxial large / small two-stage configuration becomes larger than that of the intermediate gear, which is an obstacle to downsizing of the entire rotation transmission system.

It is also conceivable to additionally interpose a reduction gear having a coaxial large and small two-stage structure between the intermediate gear and the large-diameter reel gear. However, in this case, it is undeniable that the direction of the rotation transmission is reversed by additionally providing the reduction gear. Incidentally, in order to eliminate such a problem, it is necessary to further interpose a gear for reversing the rotation direction in the transmission system. However, using such a large number of gears poses a problem in downsizing the entire rotation transmission system, and is extremely disadvantageous structurally.

The present invention has been made in consideration of such circumstances, and an object thereof is to provide a rotation transmission device having a compact and simple structure, which is suitable for use as a reel receiving drive mechanism of a tape recorder. To do.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a main gear having external teeth and a rotating body coaxially having first and second gear portions formed of external teeth are rotated via an intermediate rotating body. A rotation transmission device for transmitting the external gear that is constantly meshed with the main gear and is selectively meshed with the first gear, and is coaxially provided inside the external gear. A first intermediate rotating body having an internal gear portion,
The third and fourth gear portions having external teeth are coaxially provided, and the internal gear portion and the internal gear portion are provided only when the external gear portion is separated from the first gear portion and is in a predetermined position. A second intermediate rotating body capable of simultaneously meshing with the second gear section is provided to control selective meshing between the external gear section and the first gear section, and at the same time with the third gear section. The meshing with the internal gear section and / or the meshing between the fourth gear section and the second gear section is controlled.

[0009]

With this structure, by engaging the external gear part, which is always meshed with the main gear, with the first gear part,
Rotational transmission is performed between the main gear and the rotating body via the first intermediate rotating body. The third gear portion and the inner gear portion are engaged with each other and the fourth gear portion and the second gear portion are engaged with each other in a state where the external gear portion is separated from the first gear portion. By doing so, rotation transmission is performed between the main gear and the rotating body via the first intermediate rotating body and the second intermediate rotating body.

That is, the rotation transmission between the main gear and the rotating body is selectively performed via the first intermediate rotating body or from the first intermediate rotating body to the second intermediate rotating body. At this time, by performing rotation transmission between the first intermediate rotation body and the second intermediate rotation body under a predetermined rotation transmission ratio,
As described above, it is possible to sufficiently increase the difference in the transmission ratio of the rotation transmission selectively performed. Moreover, since the rotation transmission between the first intermediate rotating body and the second intermediate rotating body is performed by the meshing of the internal gear portion and the external gear portion, the rotation direction of the main gear and the rotating body is always maintained. Can be matched.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotation transmission device according to the present invention will be described below with reference to the drawings, taking a case where it is applied to a reel receiving drive mechanism of a tape recorder as an example.

FIG. 1 is a plan view showing a schematic structure of a main part of a reel receiving / driving portion in a cassette type tape recorder.
Shows the side surface configuration as a schematic cross-sectional view. When this device is used as a reel receiving mechanism of an auto-reverse type tape recorder, a left-right symmetrical device may be used together.

In these figures, reference numeral 1 denotes a capstan gear (main gear) provided coaxially with the capstan 2. The gears shown here are all composed of fixed modules. The capstan 2 has a flywheel 3 that also functions as a belt pulley and is coaxially attached to the lower end of the capstan 2. Then, between the motor pulley 5 attached to the rotating shaft of the motor 4 and the flywheel 3 described above, a belt is
Capstan gear from motor 4 by stretching 6
Transmission of rotational force to 1 is made. Therefore, the reel receiving / rotating mechanism according to the embodiment causes such rotation of the capstan 2 from the capstan gear 1 to the reel receiving 7 (rotating body).
It is configured as follows to be transmitted to.

A reel receiver 7, a first reel gear (first gear portion) 11 for rotating at a high speed and having a small diameter and a small number of teeth, and a second reel gear (second gear for rotating at a low speed and having a large number of teeth (second gear)) The gear part) 12 is mounted on a common fixed shaft 8. Specifically, the reel receiver 7 is press-fitted and integrated with the upper end portion of the first reel gear 11, and is rotatably supported by the fixed shaft 8.
The second reel gear 12 is rotatably fitted to the first reel gear 11 with a friction transmission member 14 such as a felt material sandwiched between the second reel gear 12 and a flange 13 protruding from an intermediate portion of the first reel gear 11. Has been. The compression spring 15 inserted between the reel receiver 7 and the second reel gear 12 presses the second reel gear 12 against the flange 13 via the friction transmission member 14. By the compression spring 15 and the friction transmission member 14, the first and second reel gears 11 and 12 are provided.
A friction transmission mechanism is formed between them, and the first and second reel gears 11 and 12 are integrally rotatable via this friction transmission mechanism.

That is, the reel receiver 7 is the first reel gear 11
It rotates together with the second reel gear.
12 can be rotated integrally via a friction transmission mechanism.

The first intermediate gear 21 for high speed rotation which transmits the rotation of the capstan gear 1 to the reel receiver 7 is
An external tooth gear portion 22 that constantly meshes with the capstan gear 1 and selectively meshes with the first reel gear 11, and an internal tooth gear portion 23 provided inside the external tooth gear portion 22 are provided. is doing. That is, the first intermediate gear 21 has an outer toothed gear portion 22 formed on the outer peripheral surface of a gear body made of a disk body, and an inner toothed portion formed on the inner wall surface of a cylindrical portion formed coaxially on one surface of the gear body. The gear portion 23 is formed.

The center of rotation of the first intermediate gear 21 is supported by the tip end of the first support arm 24. The first support arm 24 has its base end rotatably supported by the chassis, and the rotation of the first support arm 24 causes the first intermediate gear 21 to move to the external gear section 22. Is constantly displaced while being meshed with the capstan gear 1, and the external gear section 22 is selectively meshed with the first reel gear 12.

The selective engagement between the external gear 22 and the first reel gear 11 by the rotation of the first support arm 24 is controlled in association with the movement of a fast-forwarding operation lever (not shown) of the tape recorder. . That is, the first support arm 24 is always held at a predetermined position where the external gear 22 and the first reel gear 11 separate from each other. Then, only when the fast-forwarding operation lever is operated, the first support arm 24 moves to the external gear portion.
It is rotationally displaced to a position where 22 and the first reel gear 11 mesh with each other (first control means A).

The external gear section 22 is replaced with a capstan gear.
In order to selectively mesh the external gear portion 22 with the first reel gear 11 while always meshing with 1, the first intermediate gear 21
When the first support arm 24 supporting the first support arm 24 is rotated, the rotation fulcrum of the first support arm 24 is generally set at the rotation center position of the capstan gear 1. However, in this embodiment, when the external gear section 22 and the first reel gear 11 are selectively meshed with each other, the meshing state between the external gear section 22 and the capstan gear 1 does not become improper. 1 support arm
A rotation fulcrum of 24 is set inside the internal gear section 23.

On the other hand, the second intermediate gear 3 for low speed rotation for transmitting the rotation of the capstan gear 1 to the reel receiver 7
1 includes a third gear portion 32 that selectively meshes with the internal gear portion 23 of the first intermediate gear 21 and a fourth gear portion 33 that selectively meshes with the second reel gear 12. It consists of large and small gears that are coaxially integrated. This second intermediate gear 31
Has a base end supported by a rotation end of a second support arm 34 rotatably attached to the chassis.
With the rotation of the first intermediate gear 21, the position can be displaced between a position where it meshes with the internal gear part 23 of the first intermediate gear 21 and the second reel gear 12 and a position where it separates from these gears.

The second intermediate gear 31 is normally the internal gear portion 23 of the first intermediate gear 21 and the second reel gear.
The second support arm 34 is rotated only when it is held at a predetermined position away from the first intermediate gear 21, and the external gear portion 22 of the first intermediate gear 21 is at a predetermined position away from the first reel gear 11. By the dynamic displacement control, the third gear portion 32 meshes with the internal gear portion 23 of the first intermediate gear 21, and the fourth gear portion 33
Is rotationally displaced to a position where it meshes with the second reel gear 12. The rotational displacement control of the second support arm 34 is performed in association with the movement of a recording / playback operation lever (not shown) of the tape recorder, that is, only when the recording / playback operation lever is operated (second Control means B).

The rotation fulcrum of the second support arm 34 is such that the third and fourth gear portions 32 and 33 of the second intermediate gear 31 are attached to the internal gear portion 23 and the second reel gear 12. On the other hand, inside the outer tooth gear portion 22 of the first intermediate gear 21, in particular, the inner tooth gear portion, so that the pitch circles are respectively displaced in the contacting direction and the turning radius is not increased. It is defined as the inside of 23.

According to the reel receiving drive mechanism (rotation transmitting device) thus constructed, as shown in FIG. 3, the first and second reel gears 11 and 11 of the first and second intermediate gears 21 and 31 are provided. By selectively controlling the meshing with 12, the rotation of the capstan gear 1 is performed via the first intermediate gear 21.
Alternatively, it is transmitted from the first intermediate gear 21 to the reel receiver 7 via the second intermediate gear 31, and the reel receiver 7 is rotationally driven at different rotation speeds.

That is, as shown in FIG. 3A, the external tooth gear portion 22 of the first intermediate gear 21 is separated from the first reel gear portion 12, and the first gear portion of the second intermediate gear 31 is separated. 32 above first
The state in which the intermediate gear 21 is separated from the internal gear portion 23 is set when neither the recording / playback operation lever nor the fast-forward operation lever described above is operated. However, in this state, the first intermediate gear 21 in which the external gear portion 22 is constantly meshed with the capstan gear 1 rotates in accordance with the rotation of the capstan gear 1. Since it is not transmitted to the 2 reel gears 11 and 12,
The reel receiver 7 does not rotate. This state is the stopped state in the tape recorder. In this stopped state, a pinch roller (not shown) that sandwiches the tape with the capstan 2 and runs the tape at a constant speed.
However, the rotation of the capstan 2 does not contribute to the running of the tape because it is held at a position apart from the capstan 2 by being restricted by the recording / playback lever in the non-operating position.

On the other hand, as shown in FIG. 3 (b), the first
The external gear 22 of the intermediate gear 21 is held at a predetermined position away from the first reel gear 11 (stopped state)
When a recording / playback lever (not shown) is operated, the position of the second intermediate gear 31 is rotationally displaced. Then, the second gear portion 32 of the second intermediate gear 31 meshes with the internal gear portion 23 of the first intermediate gear 21, and at the same time, the fourth gear portion 33 of the second intermediate gear 31 becomes the second gear portion 33. Meshes with the reel gear 12 of.

Then, the rotation of the first intermediate gear 21 that meshes with the capstan gear 1 and rotates, is reduced in accordance with the gear ratio between the internal gear portion 23 and the third gear portion 32, The rotation is transmitted to the second intermediate gear 31. The rotation of the second intermediate gear 31 is reduced in accordance with the gear ratio between the second gear portion 33 and the second reel gear 12, and the second reel gear 31 is decelerated.
The rotation of the second reel gear 12 is transmitted to the reel receiver 7 via the friction transmission member 14 described above. As a result, the reel receiver 7 is rotationally driven by being subjected to the large two-stage deceleration described above. The reel receiver 7 rotates in the same direction as the capstan gear 1.

This state is recording / recording on the tape recorder.
In the reproduction state, the pinch roller is elastically moved and displaced toward the capstan 2 by the movement of the recording / reproduction lever which sets this state. The tape is sandwiched between the pinch roller and the capstan 2, and the tape is driven to run at a constant speed according to the rotation speed of the capstan 2. Then, the reel receiver 7 which is rotationally driven at a low speed through the friction transmission mechanism described above rotates the reels in the cassette and sequentially winds the tape.

On the other hand, as shown in FIG. 3 (c), when the second gear portion 33 of the second intermediate gear 31 is separated from the second reel gear 12, for example, in the stop state described above, a fast-forward lever (not shown) is provided. When is operated, the first intermediate gear 21
Is rotated and displaced, and the external gear section 22 meshes with the first reel gear 11. As a result, the rotation of the first intermediate gear 21, which is rotating by engaging the external gear section 22 with the capstan gear 1, is directly transmitted from the external gear section 22 to the first reel gear 11. The reel receiver 7 rotates at high speed integrally with the first reel gear 11. The rotation transmission ratio at this time is determined only by the tooth number ratio between the capstan gear 1 and the second reel gear 12. At this time, the reel receiver 7 also rotates in the same direction as the capstan gear 1.

This state is the fast-forwarding state in the tape recorder, and at this time, the pinch roller is not pressed against the capstan 2. As a result, the tape is wound at a high speed by the reel in the cassette rotated at a high speed by the reel receiver 7 regardless of the rotation of the capstan 2, and the tape is fast-forwarded there.

In the above description, the recording / playback state and the fast-forward state are set from the stopped state, but they may be set from other states without going through the stopped state. In this case, for example, after the external tooth gear portion 22 of the first intermediate gear 21 and the first reel gear 11 which are in mesh with each other are separated from each other, the third gear portion 32 is moved to the first intermediate gear 21. It suffices to selectively control the meshing relationship such that the fourth gear portion 33 meshes with the internal gear portion 23 and the fourth gear portion 33 meshes with the second reel gear 12.

According to the reel receiving drive mechanism (rotation transmitting device) having the above-described structure, the meshing control of the first intermediate gear 21 by the rotation of the first intermediate gear 21 and the rotation of the second intermediate gear 31 are controlled. By selectively performing simultaneous meshing control of the first intermediate gear 21 and the second reel gear 12 by the movement, the rotation of the capstan gear 1 is transmitted without changing the rotation direction thereof. The ratio can be greatly varied and transmitted to the reel receiver 7. Further, the speed reduction ratio of the rotation transmission system from the first intermediate gear 21 to the second intermediate gear 31 can be simplified and effectively increased.

In particular, the rotation of the first intermediate gear 21 is received by the second intermediate gear 31 meshing with the internal gear portion 22 thereof and transmitted to the second reel gear 12, so that the second intermediate gear 31 is The diameter can be reduced and the second intermediate gear 31 can be arranged so as to overlap the inside of the first intermediate gear 21, and the plane space required for gear arrangement can be narrowed. First as mentioned above
Since the reduction gear ratio can be easily increased by interposing the second intermediate gears 21 and 31, the diameter of the second reel gear 12 can be reduced and the flat space required for gear arrangement can be reduced accordingly. As a result, the overall size of the reel receiving / driving mechanism (rotation transmitting device) can be made compact.

Incidentally, the conventional one is a capstan gear.
First and second intermediate gears are provided in parallel between the 1 and 2 reel gears 11 and 12, and these intermediate gears are selected between the capstan gear 1 and the 2 reel gears 11 and 12. Since it is a structure in which the capstan 2 and the reel receiver 7 are positioned, the sizes (diameters) of the first and second intermediate gears are determined to some extent by the positional relationship between the capstan 2 and the reel receiver 7. Therefore, even if the first and second reel gears 11 and 12 and the first and second intermediate gears are to be arranged (arranged) in an orderly and compact manner, it cannot be denied that a relatively large planar space is required.
In this respect, with the above-mentioned configuration, the second intermediate gear 31 may have a small diameter and the diameter of the second reel gear 12 does not need to be so large. It can be made narrow enough.

Further, as described above, since the rotation fulcrum of the first support arm 24 is set inside the internal gear 23 of the first intermediate gear 21, the cylinder forming the internal gear 23 is formed. Since the entire first support arm 24 can be housed inside the part, and the second intermediate gear 31 can also be housed inside the first intermediate gear 21, it is necessary to arrange the gears accordingly. The effect that the space space in the height direction can be reduced can also be achieved.

The present invention is not limited to the above embodiment. Although the rotation transmission system on the so-called take-up reel (right side reel) side is shown in the embodiment, the rotation transmission system on the supply reel side can be similarly configured. Further, as described above, since the rotation transmission ratios of the two rotation transmission systems can be greatly different, for example, the diameters (the number of teeth) of the first and second gear portions 32, 33 of the second intermediate gear can be made equal to each other,
The reduction ratio may be determined by the diameter (number of teeth) of the internal gear portion 33 of the first intermediate gear 21 and the diameter (number of teeth) of the second reel gear 13. Conversely, the first and second reel gears
It is also possible to equalize the diameters (number of teeth) of 11, 12 and determine the reduction ratio by the diameters (number of teeth) of the first and second gear portions 32, 33 of the second intermediate gear.

In the embodiment, the first reel gear 11 and the second reel gear 11 are
The reel gear 12 and the reel gear 12 are coaxially rotatable with each other via a friction transmission member. However, when it is necessary to simply rotate the rotating body (reel receiver) at different speeds, the first and second
The reel gears 11 and 12 may be directly connected and integrated. Furthermore, the direction of rotation transmission may be reversed. However, in this case, it goes without saying that, in the case of the gear configuration shown in the above-described embodiment, the speed-up rotation transmission is performed. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

[0037]

As described above, according to the present invention, the external gear portion is always meshed with the main gear, and the first gear portion of the rotating body is selectively meshed with the main gear and the rotating body. A first intermediate rotating body for transmitting rotation between the third rotating body and a third gear portion selectively meshing with an internal gear portion of the intermediate rotating body; and a second gear portion of the rotating body. A second intermediate rotating body that coaxially has a fourth gear portion that meshes with the first intermediate rotating body and that transmits rotation between the first intermediate rotating body and the rotating body; The rotation transmission via the first intermediate rotation body and the rotation transmission from the first intermediate rotation body via the second intermediate rotation body are selectively performed, so that the rotation directions in both rotation transmission systems are aligned with each other with a simple gear structure. The rotation transmission ratio between the two can be effectively varied greatly.

In addition, the reduction ratio of the rotation transmission system via the first and second intermediate rotating bodies can be simplified and effectively increased without providing an additional reduction gear. Further, the plane space required for the gear arrangement can be greatly reduced, and the required space in the height direction can also be reduced, so that it is possible to achieve an effect such as downsizing of the entire apparatus.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of a main part of a reel receiving drive mechanism in a tape recorder to which a rotation transmission device according to an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view schematically showing a side surface configuration of the reel receiving drive mechanism shown in FIG.

FIG. 3 is a diagram schematically showing a rotation transmitting action in the reel receiving drive mechanism shown in FIG.

[Explanation of symbols]

 1 ... Capstan gear (main gear) 2 ... Capstan 3 ... Flywheel 4 ... Motor 5 ... Motor pulley 6 ... Belt 7 ... Reel receiver (rotating body) 8 ... Fixed shaft 11 ... 1st reel gear (1st gear part) 12 ... Second reel gear (second gear portion) 13 ... Flange 14 ... Frictional transmission member 15 ... Compression spring 21 ... First intermediate gear (first intermediate rotor) 22 ... External tooth gear portion 23 ... Internal teeth Gear unit 24 ... First support arm 31 ... Second intermediate gear (second intermediate rotor) 32 ... Third gear unit 33 ... Fourth gear unit 34 ... Second support arm

Claims (4)

[Claims] 1. A main gear having external teeth, a rotating body coaxially having first and second gear portions made of external teeth, constantly meshed with the main gear, and selectively to the first gear portion. A first intermediate rotating body having an externally toothed gear portion provided so as to be capable of meshing, and an internally toothed gear portion coaxially provided inside the externally toothed gear portion; the externally toothed gear portion and the first gear; A first control means for selectively controlling meshing with a gear portion and third and fourth gear portions having external teeth coaxially, and the external gear portion is separated from the first gear portion by a predetermined distance. A second intermediate rotating body provided so as to be able to mesh with the internal gear portion and the second gear portion at the same time only when in the position, and the third gear portion and the internal gear portion mesh with each other. ,and/
Alternatively, the rotation transmission device is provided with a second control unit that controls meshing between the fourth gear unit and the second gear unit. 2. The rotation transmission device according to claim 1, wherein the third and fourth gear parts are coaxial two-stage gears of small diameter and large diameter. 3. The rotation transmission device according to claim 1, wherein the first and second gear portions are composed of coaxial two-stage gears of small diameter and large diameter. 4. The rotation transmission device according to claim 3, wherein the first and second gear portions are integrally rotatable via a friction transmission mechanism.