JP6990928B2 - Rotational force transmission mechanism - Google Patents

Description

The present invention relates to a rotational force transmission mechanism for adjusting the volume of an audio amplifier, and more particularly to a rotational force transmission mechanism for adjusting the volume by a manual rotation operation or an electric motor drive by a remote command.

In the conventional volume adjustment (volume adjustment) method using a variable resistance, the impedance changes when the music signal passes through the resistor. As a result, the sound quality changes by changing the volume by lowering the S / N and increasing the distortion. It is extremely difficult to eliminate this change in sound quality in a method using a variable resistor for volume adjustment, and this is a problem to be solved.

In order to solve the above-mentioned problems in the volume adjustment method using a variable resistor, the inventors of the present application have developed a volume adjustment method using a variable resistor. In this volume adjustment method, the input music signal voltage is converted into n kinds of weighted currents by n voltage-current conversion amplifiers (VI conversion amplifiers: VI converters), and n current switches are turned on / off. Combine with OFF. The combination result is used as an output music signal voltage by a current-voltage conversion amplifier (IV conversion amplifier: IV converter). This method will be referred to as an analog variable gain amplifier (AVA).

FIG. 14 is a functional block diagram illustrating a system configuration example of an analog variable gain amplifier (AVA) to which the present invention is applied. This AVA feeds the input music signal (INPUT) 20 to the VI converter 22 through the buffer amplifiers 21a and 21b. The VI converter 22 has n voltage-current conversion amplifiers (VI conversion amplifier: VI converter) 22 (1), 22 (2), ... 22 (n-1), 22 (n). ) Converts to n weighted currents.

n is a natural number and the factorial above is 2 ⁿ . Here, it will be described as n = 16. That is, the current values weighted as 1/2 ¹ , 1/2 ² , 1/2 ³ , ... 1/2 ¹⁵ , 1/2 ¹⁶ are 1/2, 1/4, 1/8, ... ... 1/32, 768, 1/65, 536.

These 16 types of currents are generated by operational amplifiers (OP amplifiers) 22 (1), 22 (2), 22 (3), ... 22 (n-1), 22 (n) and combined by the current switch 23. It is selected and added by the adder 26. The current value added by the adder 26 is a value corresponding to the adjustment position of the volume adjustment knob (volume control knob, hereinafter also simply referred to as a knob) 25 of the audio amplifier. This selection is controlled by the CPU 24.

The current added by the adder 26 becomes an output music signal (OUTPUT) 28 by the current-voltage conversion amplifier (IV converter) 27, that is, a volume-adjusted music signal. Details of this volume adjustment are disclosed in Patent Document 1. In addition, Patent Document 2 and Patent Document 3 can be mentioned as disclosure of the prior art relating to the volume adjusting mechanism for suppressing rattling during knob operation or considering the high-class feeling of operation.

Not limited to the above volume adjustment method, the mechanism that transmits to the rotation of the controlled part such as volume adjustment by the manual rotation of the adjustment knob or the rotation of the electric motor in remote control is to give a sense of quality or to give a hand finger. A knob with a relatively large mass is used because it is easy to operate.

FIG. 15 is an external view showing an example of an audio amplifier to which the present invention is applied. This audio amplifier is a horizontal preamplifier and is housed in a device housing 30. Reference numeral 31 is a front panel. In this example, reference numeral 32 is an input selector (input source selection display), 33 is a remote sensor, 34 is an operation indicator such as a volume value, and 35 is a power switch. Reference numeral 15 is a volume adjustment knob (volume control knob). A signal input terminal, an output terminal for an amplified output signal, etc. are provided on the back surface.

The rotational force transmission mechanism according to the present invention is applied to the volume adjusting mechanism operated by the volume adjusting knob 15 of FIG. The rotational force transmission mechanism according to the present invention can also adjust the volume by receiving the remote operation signal received by the remote sensor 33 and driving the built- in electric motor 9.

Japanese Patent No. 5598676 Japanese Unexamined Patent Publication No. 2014-89923 Japanese Unexamined Patent Publication No. 2009-230873

A typical example of various problems of the volume control mechanism of the audio amplifier at present is described below. That is, in the technical field, a large-diameter knob is preferably adopted in order to give a high-class feeling to an audio amplifier, or in consideration of ease of operation with fingers and a feeling of mass. However, if only the knob diameter is increased, the shaft diameter of the rotating shaft becomes relatively small, so that the shaft is bent and the transmission of rotation becomes uneven. If the shaft diameter is increased (thickened) to avoid this, rotational friction will increase, a high torque motor with a large size will be used, and the space occupied by the adjustment mechanism in the product housing will also increase.

In addition, it is necessary to set a backlash to reduce the rotational noise of the reduction gear loaded on the electric motor drive, and to have a clearance for absorbing backlash between the shaft and the bearing. If the backlash is increased, a feeling of rattling will occur during manual operation and the sense of quality will be impaired. Since this type of gear is fixed to the chassis and assembled, the rotation sound also varies due to the variation of the gear, and it is transmitted to the chassis and amplified to cause vibration of the entire product.

The present invention is to solve the above-mentioned problems, and typical configurations of the means for solving the problems are listed below. In addition, in order to facilitate the understanding of the present invention, the reference numerals of the configurations in the following examples corresponding to the configurations of the present invention are also described in this item, but the present invention is not limited to the configurations indicated by the reference numerals. ..

The rotational force transmission mechanism according to the present invention transmits the rotational driving force by a manual or electric motor to the rotated operation unit 400 for adjusting the volume of the audio amplifier.
(1) A manual rotation operation unit 100 having a rotation knob 15 fixed to the front end of the main shaft 1, a motor rotation drive unit 200 arranged so as to be coupled to an intermediate portion of the main shaft 1 by a gear system 40, and the above. A front joint 6a attached to the rear end of the main shaft 1 and a rear joint 6b attached to the front end of the rotating shaft 13a having the rear end fixed to the rotated operation portion 400 via a rubber elastic body 6c. It was composed of a rotational force transmission coupling unit 300 that was coupled to the main shaft 1 and transmitted the rotational force of the main shaft 1 to the rotated operation unit 400.

The rubber elastic body 6c is preferably a rotationally symmetric member having a drum-shaped cross section in the axial direction, or a shape in which the entire body is cylindrical and a cross shape orthogonal to each other in the axial direction is connected to the central portion thereof. It is preferable to use a thermoplastic polyester elastomer, for example, "Hytrel (registered trademark of Toray DuPont Co., Ltd.)" as the material.

(2) The motor rotation drive unit 200 is attached to a main wheel 5 attached to an intermediate portion between the electric motor 9 and the main shaft 1 via a coil spring 2 between the main shaft 1 and the main wheel 5. It was composed of a transmission gear material (worm with wheels) 4 having wheels 4a and 4b that were engaged and rotated by the motor 9.

(3) The main shaft 1 is made of a high-rigidity rod, and has a radial direction of 3 or more (four side surfaces of up, down, left, and right in the examples described later) of the main shaft 1 in front of the front joint 6a at the rear end. A spring bearing 10 is provided on the outer side surface to be elastically held.

(4) A chassis 14 formed by cutting out a metal block that houses a manual rotation operation unit 100 excluding the rotation knob 15, a motor rotation drive unit 200, a rotation force transmission coupling unit 300, and a rotation operation unit 400. Have and
A suspension device (worm suspension device) 16 for movably holding the transmission gear material 4 between the electric motor 9 of the gear system 40 and the main shaft 1 constituting the motor rotation drive unit 200 in the chassis 14 is provided. , The variation in meshing of the gear system 40 is absorbed by the movement of the transmission gear material 4.

The above transmission gear material (worm with wheel) 4 is incorporated in a so-called cantilever structure, the worm 3 side on the motor side is fixed with a cantilever fixing end side screw (worm suspension device mounting right screw) 16b, and the free end is fixed. The cantilever free end side screw (worm suspension device mounting left screw) 16a is mounted in a structure in which the inner wall of the screw hole of the opening 14c of the chassis 14 can be moved (sliding).
As the metal block, aluminum / aluminum alloy, copper / copper alloy, magnesium alloy and the like can be used.

(5) The chassis 14 is sized to accommodate the entire rotational force transmission mechanism from the main shaft 1 to the rotated operation unit 400.

(6) Further, the chassis 14 has a size (depth) for accommodating the motor rotation drive unit 200 from the main shaft 1, and the parts of the rotational force transmission coupling unit 300 and the rotated operation unit 400 are the chassis. It can also be configured to be covered with a protective case 36 attached to 14.

(7) By providing the cushioning support structures 7, 8, 9, 18, and 19 that floatly support the electric motor 9 with respect to the chassis 14, vibration caused by gear backlash is suppressed.

(8) The floating support has a mounting structure in which the bracket 9a and the terminal plate 9b screwed to the chassis 14 are attached via the rubber spacers 7a and 7b.

(9) The rotated operation unit 400 is mechanically coupled to the manual rotation operation unit 100 and the motor rotation drive unit 200 to reduce the input music signal voltage to a weighted current of 1 / 2n (n is a natural number). It was composed of a rotary switch 13 for selecting a combination of n outputs of the VI converter to be converted.

(10) The rotational force transmission coupling portion 300 is provided in front of the front joint 6a attached to the rear end of the main shaft 1 and the front joint 6a so that the side surfaces of the main shaft 1 are elastic from four directions. It was composed of a spring bearing 10, a clutch mat 11, and a rear joint 6b attached to the front end of the shaft 13a of the rotated operation unit 400 and coupled to the front joint 6a.
(11) The n was set to 16, and the weighted current values were set to 1/2, 1/4, 1/8, ... 1/32, 768, 1/65, 536.

It goes without saying that the present invention is not limited to the configurations described in the above items, and various modifications can be made within the scope of the technical idea of the present invention.

The above-mentioned configuration example of the present invention and its effects can be briefly summarized as follows. First, by increasing the diameter of the shaft fixed to the knob to eliminate bending due to rotation, and supporting three or more sides (four sides in the example) behind the shaft with spring bearings, rattling caused by rotation is absorbed. , It can be easily driven even with a low rotational torque.

The housing of the volume control unit is a high-precision chassis formed by carving out a metal block. As the metal, aluminum / aluminum alloy, copper / copper alloy, magnesium alloy and the like can be used. The gear mechanism housed in this chassis can be moved according to the amount of variation of the gear. As a result, the manufacturing variation of the gear is absorbed, and the operation of each gear can be kept within the standard range.

In addition, a grease reservoir is provided in the gear so that the grease circulates due to the rotation of the gear. Since the grease is evenly supplied, uneven rotation due to insufficient grease or the like is suppressed.

Furthermore, the drive motor and gear system are float-supported to the chassis using spring bearings and cantilever structures, and the backlash adjustment of the gears is performed to suppress the noise of the gear system. To.

With the configuration of the present invention, the feeling of uneven rotation and rattling transmitted to the fingers during manual volume adjustment is suppressed, and a smooth operation feeling and fine adjustment are possible. In addition, even with volume adjustment driven by remote control, stable rotation with low vibration and low noise can be obtained, fine adjustment is possible, and it is possible to provide quiet and high-class audio equipment.

Furthermore, the miniaturization of the volume control unit contributes to the improvement of space efficiency in the audio amplifier housing and the workability of product manufacturing. In addition, the performance can be maintained for a long period of time, and the reliability is significantly improved.

The developed perspective view explaining Example 1 of the rotational force transmission mechanism which concerns on this invention. FIG. 3 is a perspective view showing a response in which each component shown in FIG. 1 is assembled. FIG. 3 is a perspective view showing a state in which the rotation transmission mechanism shown in FIG. 2 is housed in a chassis to form a unit. 3 is a top view and an internal cross-sectional view of the volume adjusting unit, which is a bird's-eye view of FIG. 3, where FIG. 4A is a top view and FIG. 4B is a cross-sectional view taken along the line AA of FIG. 4A. FIG. 4B is an explanatory diagram of the clearance between the chassis bearing and the main shaft 1 in the E portion of FIG. 4 (b). The explanatory view of the spring bearing part in the F part of FIG. 4 (b). The developed perspective view explaining the rotational force transmission system of the main shaft in FIG. It is a perspective view explaining the positional relationship between the worm with a wheel and the worm on the main wheel and the motor side when assembling to the state of FIG. FIG. 8 is a perspective view of a main part showing an extracted portion of a worm with a motor and a wheel in FIG. Expanded perspective view of the main part explaining the motor mounting state of FIG. 11 (a) is a top view and FIG. 11 (b) is a top view, which is the same top view and internal cross-sectional view as in FIG. 4 for further explaining the structure of the volume adjusting unit with a bird's-eye view of FIG. 3 from above. A cross-sectional view taken along the line (a). FIG. 3 is an overall perspective view of Example 1 of the rotational force transmission mechanism according to the present invention, showing a state in which the upper surface including the opening of FIG. 3 is covered with a lid. The whole perspective view which is the same as FIG. 12 explaining Example 2 of the rotational force transmission mechanism which concerns on this invention. A functional block diagram illustrating a system configuration example of an analog variable gain amplifier (AVA) to which the present invention is applied. The external view which shows an example of the audio amplifier to which this invention is applied.

Hereinafter, embodiments of the rotation transmission mechanism according to the present invention will be described in detail with reference to the drawings of Examples.

FIG. 1 is a developed perspective view illustrating Example 1 (type 1) of the rotation transmission mechanism according to the present invention, and shows a main part of a volume adjusting mechanism of an audio amplifier. Further, FIG. 2 is a perspective view showing a response in which each component shown in FIG. 1 is assembled. FIG. 3 is a perspective view showing a state in which the rotation transmission mechanism shown in FIG. 2 is housed in the chassis to form a unit. In FIG. 3, the lid covering the opening 14c on the upper surface is removed. This rotation transmission mechanism is roughly composed of a manual operation unit 100, a motor rotation drive unit 200, a rotation force transmission coupling unit 300, and a rotation operation unit 400.

The manual operation unit 100 includes a knob 15 attached to the front end of the main shaft 1. The knob 15 is a volume control knob (volume control knob), and a reference mark 15a is engraved on a part of the outer circumference. The reference mark 15a is adapted to match the volume level mark marked on the front panel 31 of the apparatus housing 30 shown in FIG. 3 for indicating the position of the adjustment midpoint.

The motor rotation drive unit 200 is a gear system 40 composed of a coil spring 2 that elastically supports the main shaft 1 in the main wheel 5, a worm 3 on the motor side fixed to the rotation shaft of the electric motor 9, and a worm 4 with wheels. It is composed. 3a is the worm cover on the motor side, 3b is the worm shaft cover on the motor side, 4a is the wheel on the motor side, 4b is the worm on the knob side, 7a is the left rubber spacer, 7b is the right rubber spacer, 8a is the motor left mounting part, and 8b is. Motor right mounting part, 9a is motor mounting front bracket, 9b is terminal plate, 16a is worm suspension device mounting left screw (cantilever free end side screw), 16b is worm suspension device mounting right screw (cantilever fixing side screw) Is.

The rotational force transmission coupling portion 300 includes a joint 6a attached to the rear end of the main shaft 1, a spring bearing 10 clutch mat 11 provided immediately before the joint and elastically holding the side surface of the main shaft 1 from four directions, and a cover. It is composed of a rear joint 6b that is connected to a front joint 6a attached to the front end of the shaft 13a of the rotation operation unit 400 with a hexagonal head front screw 17a.

The front joint 6a and the rear joint 6b are connected by a rubber elastic body 6c. As described above, the rubber elastic body 6c has a rotationally symmetric member having a drum-shaped cross section in the axial direction, or a shape in which the entire body is cylindrical and a cross shape orthogonal to each other in the axial direction is connected to the central portion thereof. preferable. Smooth rotational force transmission is realized by cushioning the unevenness of axial rotation at the minimum diameter portion of the drum shape or the portion where the cross shape is connected and absorbing the axial deviation. As this material, a thermoplastic polyester elastomer having excellent torsional strength and durability, and excellent oil / chemical resistance, processability, etc. is desirable. For example, "Hitrel (registered trademark of Toray DuPont Co., Ltd.)" can be mentioned.

The rotated operation unit 400 is mechanically coupled to the manual rotation operation unit 100 and the motor rotation drive unit 200 to convert the input music signal voltage into a weighted current of 1 / 2n (n is a natural number). It was composed of a rotary switch 13 for selecting a combination of n outputs of the converter. In this embodiment, n is set to 16. Therefore, the weighted current values are 1/2, 1/4, 1/8, ... 1/32, 768, 1/65, 536. The rotary switch 13 is mounted on the chassis with mounting screws 12a and 12b. The front joint 6a is coupled to the rear joint 6b attached to the front end of the shaft 13a with the hexagon head front screw 17b, and the rotational force is transmitted to the rotary switch 13.

4A and 4B are a top view and an internal sectional view of the volume adjusting unit, which is a bird's-eye view of FIG. 3 from above. FIG. 4A is a top view and FIG. 4B is a sectional view taken along the line AA of FIG. 4A. be. 5 is an explanatory diagram of the clearance between the chassis bearing and the main shaft 1 in the E portion of FIG. 4B, and FIG. 6 is an explanatory diagram of the spring bearing portion in the F portion of FIG. 4B.

In FIG. 4, the upper surface of the chassis 14 is provided with an opening 14c for accommodating the worm 4 with wheels, an operation driver hole 14d for the hexagon head front screw 17b, and a plurality of mounting screw holes 14a for mounting the lid 29a (see FIG. 12). There is.

The rotation unevenness of the main shaft 1 due to the clearance d between the main shaft 1 and the chassis bearing 140 shown in FIG. 5 is absorbed by the spring bearing 10 shown in FIG. The spring bearing 10 elastically holds the outer circumference of the main shaft 1 from, for example, four directions (the directions are irrelevant if the intervals are equal). Further, this absorbs the rotation backlash of the shaft. Further, by providing the grease reservoir on the main wheel 5, it is possible to prevent the gear system 40 including the worm 4 with wheels from running out of lubricant, and to maintain reliability for a long period of time.

FIG. 7 is a developed perspective view illustrating the rotational force transmission system of the main shaft in FIG. 1. The main shaft 1 rotated by the knob has a main wheel 5 attached by a coil spring 2, a clutch mat 11, a spring bearing 10, and a front joint 6a attached by a hexagon head front screw 17a. A rear joint 6b attached to the front joint 6a by a hexagon head rear screw 17b is connected to the front end of the shaft 13a of the rotary switch 13 by a flexible shaft (flexible shaft) method. The alignment of the bond is performed by the hexagon head rear screw 17b.

FIG. 8 is a perspective view explaining the positional relationship between the worm with a wheel and the main wheel and the worm on the motor side when assembling to the state of FIG. 2, and FIG. It is a part perspective view. As shown in FIGS. 8 and 9, the wheeled worm 4 having the motor side wheel 4a and the knob side wheel 4b meshes the motor side wheel 4a with the motor side worm 3 and the knob side wheel 4b with the main wheel 5. The worm suspension device 16 is suspended in the chassis 14 by the worm suspension device mounting left screw (cantilever free end side screw) 16a and the worm suspension device mounting right screw (cantilever fixed end side screw) 16b. This suspension system absorbs backlash between gears by adopting a cantilever system.

FIG. 10 is an exploded perspective view of a main part for explaining the motor mounting state of FIG. The electric motor 9 is mounted on the chassis 14 by the motor mounting front bracket 9a and the terminal board 9b. The motor mounting front side bracket 9a has a motor left side mounting portion 8a and a motor right side mounting portion 8b. The motor left side mounting part 8a and the motor right side mounting part 8b are mounted on the chassis 14 in a floating structure including a left rubber spacer 7a, a right rubber spacer 7b, a left spacer 19a, a right spacer 19b, a left sems screw 18a, and a right sems screw 18b, respectively. Has been done.

By mounting the motor using this floating structure, the backlash of the gears constituting the worm 3 on the motor side and the worm 4 with wheels is adjusted, and the noise caused by the rotation of the electric motor 9 is suppressed. FIG. 10 shows the motor-side worm cover 3a and the shielding cover 8 of the electric motor 9, but the motor-side worm shaft cover 3b shown in FIG. 1 is not shown.

11 is a top view and an internal cross-sectional view similar to FIG. 4 for further explaining the structure of the volume adjusting unit, which is a bird's-eye view of FIG. 3 from above. FIG. 11A is a top view and FIG. 11B is a top view. ) Is a cross-sectional view taken along the line AA of FIG. 11 (a). In FIG. 11B showing a cross section of the chassis 14 shown in FIG. 11A along the line AA, reference numeral 37 is a main shaft system installation space, and reference numeral 38 is a motor drive system installation. It's a space. These spaces are formed by machining from the surface of the chassis 14 opposite to the knob side.

A transmission gear material (worm with wheels) 4 is installed above the main shaft system installation space 37 and the motor drive system installation space 38 in FIG. 11 (b). The transmission gear material 4 is attached by a cantilever type worm suspension device 16. That is, the right side of the figure, which is the fixed end, is screwed and fixed to the chassis 14 with the worm suspension device mounting right-hand screw (cantilever fixed end side screw) 16b. The left side of the figure, which is the free end, is attached so that the worm suspension device mounting left screw (cantilever free end side screw) 16a freely moves up and down in the gliding hole formed in the chassis 14 as indicated by the arrow in the figure. There is.

By attaching the transmission gear material 4 to the cantilever type worm suspension device 16, backlash of the gear (gear) can be alleviated and noise of the gear system can be suppressed.

FIG. 12 is an overall perspective view of Example 1 (Type 1) of the rotational force transmission mechanism according to the present invention, showing a state in which the upper surface including the opening provided in the upper part of the chassis shown in FIG. 3 is covered with a lid. The type 1 chassis 14 is sized to accommodate the entire rotational force transmission mechanism from the main shaft 1 to the rotated operation unit 400.

The opening 14c in FIG. 3 is formed in the chassis 14 for mounting the transmission gear material 4. After attaching and adjusting the transmission gear material 4, the cover (type 1 lid) 29a is fixed with the lid mounting screw 39 and the cover mounting screw hole 14a shown in FIG. This completes the unitization of the type 1 rotational force transmission mechanism.

FIG. 13 is an overall perspective view similar to FIG. 12 for explaining the second embodiment (type 2) of the rotational force transmission mechanism according to the present invention. In the type 2 which is the second embodiment of the rotational force transmission mechanism according to the present invention, the chassis 14 has a size (depth) for accommodating the motor rotation drive unit 200 from the main shaft 1. As a result, the axial length of the chassis 14 can be reduced to about half that of the type 1. The built-in opening 14c of the cantilever suspension device of the transmission gear material (worm with wheels) 4 is in the same position as that of type 1, and after the transmission gear material 4 is attached and adjusted, the cover (type 2 lid) Fix 29b with the lid mounting screw 39. After that, the protective case 36 is attached to the rear part of the chassis 14 with appropriate screws (not shown). This completes the unitization of the type 2 rotational force transmission mechanism.

The rotational force transmission coupling portion 300 and the portion of the rotated operation unit 400 are covered with a protective case 36 attached to the chassis 14. The protective case 36 may be a bent part of an aluminum plate or a thin iron plate, but the soundproofing effect can be improved by using a plastic molded product such as ABS.

The chassis 14, which is a machined product of a metal block, is expensive and affects not only the rotational force transmission mechanism but also the cost of the applied audio equipment. In the type 2, the cost is reduced by limiting the size to accommodate the motor rotation drive unit 200 that contributes to noise reduction. Since the configuration of the rotational force transmission mechanism is the same as that of type 1 described above, the description thereof will be omitted.

The rotational force transmission mechanism of Example 2 described above also suppresses rattling of the gear system due to manual rotation by the knob and rotation of the electric motor during remote control operation, and quiet and high-class volume adjustment is performed with low rotational torque. realizable.

In addition, the housing of the volume control unit is a high-precision chassis formed by carving out an aluminum block, and the gear mechanism housed in the chassis is configured to absorb the amount of variation in the gear, thereby absorbing the variation in gear manufacturing. , Quieting is achieved.

The present invention is not limited to adjusting the volume of an audio amplifier by the AVA method, but can also be applied to adjusting the volume using a variable resistor. Further, it can be similarly applied to various adjustment mechanisms that require silent rotation.

1 ... Main shaft 2 ... Coil spring 3 ... Motor side worm 3a ... Motor side worm cover 3b ... Motor side worm shaft cover 4 ... Transmission gear material (worm with wheels)
4a ・ ・ ・ Motor side wheel 4b ・ ・ ・ Knob side worm 40 ・ ・ ・ Gear system 5 ・ ・ ・ Main wheel 6 ・ ・ ・ Joint 6a ・ ・ ・ Front joint 6b ・ ・ ・ Rear joint 6c ・ ・ ・ Rubber Elastic body 7 ... Rubber spacer 7a ... Left rubber spacer 7b ... Right rubber spacer 8 ... Shielding cover 8a ... Motor left mounting part 8b ... Motor right mounting part 9 ... Electric motor 9a ・ ・ ・ Motor mounting front bracket 9b ・ ・ ・ Terminal plate 10 ・ ・ ・ Spring bearing 11 ・ ・ ・ Clutch mat 12a, 12b ・ ・ ・ Mounting screw 13 ・ ・ ・ Rotary switch 13a ・ ・ ・ Rotary switch shaft 14 ・・ ・ Chassis 14a ・ ・ ・ Cover (lid) mounting screw hole 14b ・ ・ ・ Reference alignment screw hole (aligned by the index on the front panel)
14c ・ ・ ・ Opening 14d ・ ・ ・ Driver hole 140 ・ ・ ・ Chassis bearing 15 ・ ・ ・ Volume adjustment knob (Volume control knob)
15a ... Reference mark 16 ... Worm suspension device 16a ... Worm suspension device mounting left screw (cantilever free end side screw)
16b ・ ・ ・ Worm suspension device mounting right-hand screw (cantilever fixed end side screw)
17 ... Hexagon head screw 17a ... Hexagon head front screw 17b ... Hexagon head rear screw 18 ... Semis screw 18a ... Left sems screw 18b ... Right sems screw 19 ... Spacer 19a ... Left Spacer 19b ... Right spacer 20 ... Input music signal 21 (21a, 21b) ... Buffer amplifier 22 ... Voltage-current conversion amplifier (VI conversion amplifier: VI converter)
23 ... Current switch 24 ... CPU
25 ... Volume adjustment knob (Volium control knob)
26 ... Current adder 27 ... Current-voltage conversion amplifier (IV conversion amplifier: IV converter)
28 ... Output music signal 29 ... Lid 29a ... Type 1 lid 29b ... Type 2 lid 30 ... Device housing 31 ... Front panel 32 ... Input selector 33 ...・ Remote sensor 34 ・ ・ ・ Operation indicator 35 ・ ・ ・ Power switch 36 ・ ・ ・ Protective case 37 ・ ・ ・ Main shaft system installation space 38 ・ ・ ・ Motor drive system installation space 39 ・ ・ ・ Cover (closure) mounting screw 100 ... Manual rotation operation unit 200 ... Motor rotation drive unit 300 ... Rotational force transmission coupling unit 400 ... Rotated operation unit

Claims (7)

It is a rotational force transmission mechanism that transmits the rotational drive force by a manual or electric motor to the rotated operation unit for adjusting the volume of the audio amplifier.
The rotational force transmission mechanism is attached via a coil spring between a manual rotation operation unit having a rotation knob fixed to the front end of the main shaft and an intermediate portion between the electric motor and the main shaft. A main wheel and a motor rotation drive unit that is composed of a transmission gear material having a wheel that engages with the main wheel and is rotated by the electric motor and is arranged so as to be coupled to an intermediate portion of the main shaft by a gear system. , The front joint attached to the rear end of the main shaft and the rear joint attached to the front end of the rotating shaft whose rear end is fixed to the rotated operation portion are connected via a rubber elastic body. It is composed of a rotational force transmission coupling portion that transmits the rotational force of the main shaft to the rotated operation portion .
The main shaft is made of a highly rigid rod material, and is characterized in that a spring bearing is provided at the rear end in front of the front joint so as to be elastically held on the outer surface of the main shaft in the radial direction of 3 or more. Rotational force transmission mechanism. It has a chassis formed by cutting out a metal block that houses a manual rotation operation unit excluding the rotation knob, a motor rotation drive unit, a rotation force transmission coupling unit, and a rotation operation unit.
A suspension device for movably holding the transmission gear material between the electric motor of the gear system constituting the motor rotation drive unit and the main shaft is provided, and the meshing variation of the gear system can be adjusted. The rotational force transmission mechanism according to claim 1, wherein the transmission gear material is absorbed by movement . The rotational force transmission mechanism according to claim 2 , wherein the chassis accommodates the entire rotational force transmission mechanism from the main shaft to the rotated operation unit . The chassis is characterized in that the motor rotation drive portion is housed from the main shaft, and a protective case for covering the rotational force transmission coupling portion and the rotated operation portion is attached to the chassis. 2. The rotational force transmission mechanism according to 2. The rotational force transmission mechanism according to claim 2 , further comprising a cushioning support structure for floatingly supporting the electric motor with respect to the chassis, and suppressing vibration caused by backlash of gears . The rotational force transmission mechanism according to claim 5 , wherein the cushioning support structure for floating support has a bracket screwed to the chassis as a mounting structure via a rubber spacer . The rotational force transmission coupling portion includes the front joint attached to the rear end of the main shaft, and a spring bearing and a clutch provided immediately before the front joint to elastically hold the side surface of the main shaft from four directions. The rotational force transmission mechanism according to any one of claims 1 to 6, wherein the mat is composed of a rear joint attached to the front end of the shaft of the rotated operation portion and coupled to the front joint .

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