JPH06292106A - Turntable - Google Patents

Abstract

PURPOSE:To prevent a turning gear and a gear reducer mechanism from being broken due to an impact load by delivering a torque from a turning gear to a turning frame and not delivering a torque from the turning frame to the turning gear. CONSTITUTION:Each of transmission roller 8... provided to a turning gear 2 is revolved around its own axis with a friction of a base 1 while being rotated around a longitudinal axis X together with the turning gear 2 through the turning of the turning gear 2 and the turning frame 3 is turned in the same direction as the turning gear 2 by revolving and rotating action. In the case of manual operation, a torque is delivered from devices to the turning frame 3 via a top plate 4 and a torque of the turning frame 3 is exerted to the transmission rollers 8.... However, a large rotation resistance is exerted to the turning gear 2 by the gear reduction mechanism. Thus, the transmission rollers 8... are rotated around their own axes while being slipped with respect to the base 1 or in standstill while being slipped to the turning frame 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable for turning a television (including a CRT for display), an audio device, etc. around a vertical axis.

[0002]

2. Description of the Related Art Conventionally, in this type of turntable, a slewing gear which is rotationally driven around a vertical axis by a motor is provided on a base via a plurality of supporting rollers in a circumferential direction, and the slewing gear is provided with equipments. A top plate to be placed is attached, and the rotational force of the slewing gear is directly transmitted to the top plate.

[0003]

However, according to this conventional technique, when an impact load is applied to the top plate, this load is directly transmitted to the slewing gear and the reduction gear mechanism that transmits the driving force of the motor to the slewing gear. Because
These gears may be damaged and troubles such as tooth breakage may occur.

On the other hand, the motor as a drive source is operated by a remote controller or a switch on the main body side, but there are cases where it is desired to manually rotate the equipment.

In this case, since the operating force applied from the equipment to the top plate and the turning gear is transmitted to the motor by the gear reduction mechanism, the rotation resistance is large and the manual turning operation becomes very heavy. was there.

Further, since the speed reducing mechanism is capable of transmitting the rotational force from the driven side to the driving side, it is out of the above restrictions while having a good characteristic that the transmitted sound is small like a worm gear speed reducing mechanism. The reduction mechanism could not be used.

As a countermeasure against this point, it is conceivable to provide a known clutch between the swivel gear and the speed reducing mechanism. However, if this is done, the power transmission structure becomes complicated and large in size,
There is an adverse effect such as an increase in cost.

In view of the above, the present invention is free from troubles such as tooth breakage of gears, is not restricted by the reduction mechanism, and can be swung manually manually, and has a power transmission structure. It provides a simple, compact turntable.

[0009]

According to a first aspect of the present invention, a base, a slewing gear rotatably provided on the base about a vertical axis, and a slewing gear rotatably provided on the slewing gear about the vertical axis. A swivel frame provided, a motor as a rotation drive source of the swivel gear, and a reduction mechanism for decelerating the rotational force of the motor and transmitting it to the swivel gear, and at least one of the swivel gear and the swivel frame In addition, a rotational force transmitting portion that slidably contacts the other and performs a rotational force transmitting action is provided.

According to a second aspect of the present invention, in the structure of the first aspect, as the rotational force transmitting portion, the transmission rollers rotate around a horizontal axis in a plurality of circumferential positions of the revolving gear while being in contact with the base and the revolving frame. It is provided freely.

According to a third aspect of the present invention, in the structure of the first aspect, the rotational force transmitting portion is provided with projections that come into contact with the lower surface of the revolving frame at a plurality of circumferential positions of the revolving gear.

According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, a through hole is provided in the central portion across the revolving frame, the revolving gear and the base.

According to a fifth aspect of the invention, in the structure of the fourth aspect, a guide frame is provided on the base at the hole edge portion of the through hole, and the guide frame is in contact with the inner peripheral surface of the slewing gear. A guide roller for fixing the position of the gear in the radial direction is provided rotatably around the vertical axis.

According to a sixth aspect of the present invention, in the structure of the fifth aspect, a guide tube is provided on an inner peripheral portion of the turning frame, and the guide tube is fitted to the guide frame to fix the turning frame in a radial position. It will be.

[0015]

According to the above construction, when the slewing gear rotates, this rotational force is transmitted to the slewing frame via the rotational force transmitting portion (the transmission roller in claim 2 and the projection in claim 3), and the frame is rotated by the slewing gear. It turns in the same direction as the vertical axis.

In this case, according to the second aspect of the invention, the transmission roller revolves around the horizontal axis due to the frictional resistance with the base while revolving around the vertical axis together with the slewing gear, and the revolution of the transmission roller revolves. The force and rotation force are transmitted to the turning frame, and the turning frame turns.

On the other hand, at the time of manual operation, the rotational force (operating force) of the revolving frame is applied to the rotational force transmitting portion. At this time, since a large rotational resistance acts on the revolving gear by the reduction mechanism, the rotational force is transmitted. The parts slip and the rotational force of the swing frame is not transmitted to the swing gear.

That is, the rotational force transmitting portion functions as a clutch that only performs the rotational force transmission operation from the turning gear side to the turning frame side.

Therefore, since the operating force is not transmitted to the speed reducing mechanism during the manual operation, the operating resistance is small and the turning operation can be performed lightly. Further, since the rotational force is not transmitted from the driven side to the driving side, it is possible to use a worm gear or the like that has a low transmission sound without being restricted by the reduction mechanism.

Further, even if an impact load is applied to the revolving frame side, the transmission of this load is cut off by the rotational force transmitting portion and does not reach the revolving gear. There is no possibility of occurrence of.

Moreover, since it is only necessary to provide the rotational force transmitting portion on at least one of the slewing gear and the slewing frame, the power transmission structure is simple and compact, and the cost is low.

Further, according to the structure of claim 4, the electric wiring connecting the devices and the power source and the like can be passed through the through hole in the central portion, which is convenient for wiring.

Further, according to the structure of the fifth aspect, even if the swivel gear has the through hole, the swivel gear is reliably fixed in the radial direction by the guide roller at the hole edge portion, and the stable rotating operation can be maintained. it can.

According to the sixth aspect of the invention, the swivel frame is reliably fixed in the radial direction like the swivel gear. In addition, since the swivel gear and the swivel frame are positionally fixed in the radial direction by the common guide frame, the structure for fixing the position is simple.

[0025]

Embodiments of the present invention will be described with reference to the drawings.

First Embodiment (FIGS. 1 to 4) 1 is a base as a fixing member, on which a slewing gear 2 and a slewing frame 3 on the slewing gear 2 are in a horizontal posture, respectively, around a vertical axis X. A rotatably mounted top plate 4 on which a device such as a television or an audio device is placed is mounted on the swivel frame 3.

In FIG. 2, 5 is a motor as a rotational drive source of the swivel gear 2, 6 is a gear reduction mechanism for decelerating the rotational force of the motor 5 and transmitting it to the swivel gear 2, and 6a is a worm gear of the reduction mechanism 6. is there.

The slewing gear 2 is provided with recesses 7 at a plurality of positions in the circumferential direction (five in the drawing) at regular intervals, and in each of the recesses 7 there are transmission rollers 8 ... It is installed in a horizontal position.

The lower surface side of each transmission roller 8 is a recess 7
Is rotatably supported in a state where it contacts the upper surface of the base 1 through a hole 9 provided in the bottom wall of the base 1 and the upper surface contacts the lower surface of the revolving frame 3.

Reference numeral 10 denotes a horizontal shaft serving as a central axis of rotation of the transmission roller 8. The horizontal shaft 10 has bearing pieces 11 provided on both sides in the circumferential direction in each recess 7, as shown in FIGS. , 11 are elastically fitted and attached.

On the other hand, a through hole 12 is formed in the central portion across the top plate 4, the swing frame 3, the swing gear 2, and the base 1.
Is provided, and electrical wiring (not shown) that connects the devices to the power source and the like is passed through the through hole 12.

At the hole edge of the through hole 12,
A cylindrical guide frame 13 is mounted on the base 1, and a plurality of guide rollers 14 ... Are provided intermittently in the circumferential direction between the guide frame 13 and the base 1.

These guide rollers 14 ...
Is rotatably provided around the vertical shaft 15 in a state of being in contact with the inner peripheral surface of the rotating shaft 2. The guide roller 14 fixes the swivel gear 2 in the radial direction.

Further, a guide cylinder 16 fitted into the guide frame 13 is provided on the inner peripheral portion of the revolving frame 3, and the revolving frame 3 is positionally fixed in the radial direction by the fitting action of the guide cylinder 16 and the guide frame 13. Has been done.

As shown in FIGS. 1 and 2, both the guide frame 13 and the guide tube 16 are provided with arc-shaped stoppers 17 and 18 extending in the circumferential direction, and the turning frame 3 is provided.
When the arm has swung to both sides by a predetermined angle θ (30 ° in the illustrated example), the end faces of the stoppers 17 and 18 come into contact with each other to prevent further swiveling. By this stopper action,
The twisting breakage of the wiring passed through the through hole 12 is prevented.

Although not shown, one of the guide frame 13 and the guide tube is provided with a limit switch, and the other is provided with an operator for operating the limit switch. When the revolving frame 3 is rotated to a position near the regulation angle θ, The limit switch is operated to stop the rotation of the motor 5.

On the other hand, in the peripheral portion of the base 1, presser plates (leaf springs) 19 are provided at a plurality of circumferential positions to prevent the revolving frame 3 from rising.

Next, the turning action of the turning frame 3 (top plate 4) will be described.

(A) Revolving operation by the motor 5 When the motor 5 is rotated by operating a remote controller or operating a switch on the main body, this motor rotational force is applied to the gear reduction mechanism 6
Is decelerated by and transmitted to the swivel gear 2, and the gear 2 rotates about the vertical axis X.

By the rotation of the orbiting gear 2, each transmission roller 8 ... Revolves around the vertical axis X together with the gear 2 while rotating by the friction with the base 1.
The revolving frame 3 and the revolving frame 3 revolve in the same direction as the revolving gear 2.

(B) Revolving operation by manual operation At the time of manual operation, a rotating force is applied to the revolving frame 3 from the equipment through the top plate 4, and the rotating force of the revolving frame 3 is applied to the transmission rollers 8. .

However, at this time, since a large rotational resistance acts on the orbiting gear 2 by the gear reduction mechanism 6, the transmission rollers 8 rotate on the spot while slipping with respect to the base 1 or rotate. It slips with respect to the frame 3 and remains stationary (this is determined by the frictional resistance between the rollers 8 ... And the base 1 and the swing frame 3).

That is, the transmission rollers 8 ...
From the side to the revolving frame 3 side
It functions as a clutch that does not perform the opposite power transmission action.

Therefore, since the rotational force of the revolving frame 3 is not transmitted to the revolving gear 2 and the gear reduction mechanism 6 during the manual operation, the operation resistance becomes small and the revolving operation can be performed lightly.

Further, even when an impact load is applied to the revolving frame 3 side during the revolving operation by the motor 5 and the manual operation, the transmission of this load is cut off by the transmission rollers 8 ... And does not reach the revolving gear 2. Therefore, there is no risk of trouble such as tooth breakage of the gear 2 and the gear reduction mechanism 6.

Second Embodiment (see FIG. 5) Only the differences from the first embodiment will be described.

In the second embodiment, a plurality of protrusions 20 ... Are provided at intervals on the upper surface of the revolving gear 2 in contact with the revolving frame 3 in the circumferential direction as the rotational force transmitting portion. ... The turning frame 3 is supported on the top.

According to this structure, the rotational force is transmitted from the slewing gear 2 to the slewing frame 3 via the protrusions 20, and the reverse force is transmitted to the slewing frame 3 and the protrusions 20.
This is prevented by the slip action between and.

In this embodiment, in order to reduce the frictional resistance between the swivel gear 2 and the base 1, the swivel gear 2
A plurality of protrusions 21 ... Are provided on the lower surface of the. Alternatively, the slewing gear 2 or the base 1 may be used instead of the protrusions 21.
A roller that rotates around a horizontal axis may be provided in the.

Other Embodiments (1) As a modification of the second embodiment, the protrusions 20 ... As the rotational force transmitting portion may be provided on the lower surface of the revolving frame 3 instead of the revolving gear 2.

(2) As another example of the rotational force transmitting portion, another member having a small frictional resistance is provided over at least one of the surfaces of the revolving gear 2 and the revolving frame 3 which are in phase contact with each other, or friction is provided. You may give the surface treatment which resistance becomes small. If at least one of the contact surfaces of the swivel gear 2 and the swivel frame 3 has a sufficiently small frictional resistance as a whole, this contact surface may be used as it is as the rotational force transmitting portion.

(3) The deceleration mechanism for decelerating the rotational force of the motor 5 and transmitting it to the swivel gear 2 is not limited to the gear type mechanism described in the above embodiment, but may be a pulley and a belt, a sprocket and a chain, or a gear. It is also possible to use a combination of these and the like.

(4) The through holes 12 may be provided as needed. If the through hole 12 is not provided, the swivel gear 2 and the swivel frame 3 may be rotatably supported by the vertical shafts at their central portions.

(5) Although the top plate 4 is attached to the swivel frame 3 in the above embodiment, the swivel frame 3 may be used as it is as a top plate.

[0055]

As described above, according to the present invention, at least one of the slewing gear provided on the base and the slewing frame provided on the slewing gear is slidably contacted with the other. A configuration is provided in which a rotational force transmission unit that performs rotational force transmission is provided, and by this rotational force transmission unit, rotational force is transmitted from the slewing gear to the slewing frame, and vice versa. That is, since the rotational force transmitting portion is configured to perform the clutch action,
Even if an impact load acts on the revolving frame side, this load does not reach the revolving gear. Therefore, it is possible to prevent troubles such as breakage of the orbit gear and the gear reduction mechanism due to the impact load.

Further, since the operating force is not transmitted to the speed reducing mechanism during the manual operation, the operation resistance is small and the turning operation can be performed lightly. In addition, it is possible to use worm gears, etc. with less transmission noise without being restricted by the reduction mechanism, and the power transmission structure is simpler, smaller, and less expensive than the case of adding a known clutch mechanism. End

Further, according to the invention of claim 4, the electric wiring for connecting the devices and the power source and the like can be passed through the through hole in the central portion, which is convenient for wiring.

On the other hand, according to the fifth aspect of the present invention, even if the swivel gear has this through hole, the guide roller is surely positionally fixed in the radial direction at the hole edge portion, and a stable rotating operation can be maintained. it can.

Further, according to the invention of claim 6, the turning frame is reliably fixed in the radial direction like the turning gear. Moreover, since the swivel gear and the swivel frame are positionally fixed in the radial direction by the common guide frame, the structure for this position fixing becomes simple.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a partially enlarged view of FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a view, corresponding to FIG. 1, showing a second embodiment of the present invention.

[Explanation of symbols]

 1 base 2 swivel gear 3 swivel frame 5 motor 6 speed reduction mechanism 8 transmission roller as rotational force transmission unit 10 horizontal shaft as rotation center axis of transmission roller 12 through hole 13 guide frame 14 guide roller 15 as rotation center axis of guide roller Vertical shaft 16 Guide cylinder 20 Protrusion as a rotational force transmitting portion

Claims (6)

[Claims] 1. A base, a slewing gear rotatably provided on the base about a vertical axis, and a slewing frame rotatably provided on the slewing gear about the vertical axis.
A motor as a rotation drive source of the swivel gear, and a speed reduction mechanism that decelerates the rotational force of the motor and transmits the swivel gear to the swivel gear, and at least one of the swivel gear and the swivel frame slips with respect to the other. A turntable provided with a rotational force transmitting portion that is in contact with each other and performs a rotational force transmitting action. 2. The turntable according to claim 1, wherein, as the rotational force transmitting portion, transmission rollers are provided at a plurality of circumferential positions of the revolving gear so as to be rotatable about a horizontal axis in a state of being in contact with the base and the revolving frame. A turntable that has been characterized. 3. The turntable according to claim 1, wherein the rotating force transmitting portion is provided with projections that contact the lower surface of the revolving frame at a plurality of circumferential positions of the revolving gear. 4. The turntable according to any one of claims 1 to 3, wherein a through hole is provided in a central portion across the swivel frame, the swivel gear, and the base. 5. The turntable according to claim 4, wherein a guide frame is provided on the base at a hole edge portion of the through hole, and the guide frame is in contact with an inner peripheral surface of the swivel gear and the gear is radiused. A turntable characterized in that a guide roller that is fixed in position in a direction is provided rotatably around a vertical axis. 6. The turntable according to claim 5, wherein a guide tube is provided on an inner peripheral portion of the turning frame, and the guide tube is fitted to the guide frame to fix the turning frame in a radial position. Turntable characterized by.