JP2785986B2 - Auto-swing device for display equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-swing device suitable for use in a device having a display such as a TV set, an AV device, a computer, and a motor device. The present invention relates to an auto-swing device for a display device having a protection and safety mechanism.

2. Description of the Related Art Recently, a set with an automatic swing function in which a screen of a receiver body of a TV set can be symmetrically swung to a predetermined angle range by a remote control operation by a remote controller is commercially available. this is,
As shown in FIG. 9, the receiver main body 100 is placed on the installation base 10.
The unit is supported so that it can swing left and right, and a motor unit 110 is built in the main unit.
By operating 00, the motor unit 110 is operated to perform a swing operation so that the screen faces in a predetermined direction via the automatic swing mechanism. In such a TV set with an auto-swing mechanism, if an external force that prevents the swing operation of the receiver main body 100 is applied during the auto-swing operation, the auto-swing mechanism will be overloaded unless some protection measures are taken. May be damaged or an unexpected accident may occur to the user. Therefore, conventionally, protection measures as shown in FIGS. 10 and 11,
Safety measures were adopted.

In the method shown in FIG. 10, a large-diameter annular groove 10
A is formed, and the large-diameter gear 11 is fitted into this annular group 10A, while the motor unit 1 incorporated inside the receiver main body 100 is formed.
When a small-diameter gear 111 meshing with the large-diameter gear 11 is provided on the base 10 via a power transmission mechanism, and the receiver main body 100 is installed on the installation base 10, the center of the lower surface of the main body 100 is mounted on a central shaft 10 B set on the base 10. And the small-diameter gear 111 of the main body 100 meshes with the large-diameter gear 11 on the base 10. When the motor unit 110 is operated by remote control during auto-swing, the small-diameter gear 111
Meshes with the large-diameter gear 11 and revolves while rotating. As a result, the receiver main body 100 performs an auto-swing operation in a predetermined direction while the motor unit 110 runs on the large-diameter gear 11, and the screen direction is changed to the predetermined direction. that time,
When an external force is applied to the receiver main body 100 and the swing operation is prevented, the small-diameter gear 111 of the motor unit 110 continues to rotate, and the rotational force is transmitted to the large-diameter gear 11.
Is loosely fitted in the annular groove 10A of the base 10, so that only the large-diameter gear 11 slides in the annular groove 10A by the rotational force from the small-diameter gear 111. That is, the load due to the external force applied to the receiver main body 100 is absorbed by the sliding rotation of the large-diameter gear 11. This prevents damage to the auto-swing mechanism due to overload. In addition, security measures and protection measures for users can be planned.

On the other hand, in the system shown in FIG. 11, a rotating center wheel 10C is erected on an installation base 10, and a circular rack 12 having the center axis 10C as a center of a pitch circle is arranged. The motor unit 110 in the main body 100 is provided with a pinion 112 that meshes with the circular rack 12 via a power transmission mechanism, and an electromagnetic clutch is interposed between the power transmission mechanism and the motor. When the receiver main body 100 is installed on the installation base 10, the lower surface of the main body 100 is fitted and pivotally supported by the central shaft 10C, and the pinion 112 of the motor unit 110 meshes with the circular rack 12.
Then, when the motor unit 110 is operated by a remote control operation, the pinion 112 is rotated and revolves while engaging with the circular rack 12 and rotating. As a result, the receiver main body 100 performs a swing operation in a predetermined direction about the central axis 10C of the base 10, and the direction of the screen is changed by a predetermined angle. When an external force is applied to the receiver main body 100 and the swing operation is prevented, an additional current flowing through the motor of the motor unit 110 is detected, and when the current value falls below a certain value, the electromagnetic clutch is turned off and the pinion At the same time as 112 stops rotating, the swing operation of the receiver main body 100 stops.
This prevents damage to the auto-swing mechanism due to overload. At the same time, protection and security measures for users can be sufficiently achieved.

However, in the conventional system shown in FIG. 10, due to its structure, the rotation center of the swing motion of the receiver main body 100 is limited to the center of the TV set, that is, the position of the center axis 10B of the base 10. As a result, the degree of freedom in designing the equipment is reduced, and the design is restricted. Furthermore, set is large TV
In the case of (1), there is a drawback that the manufacturing cost of the large-diameter gear 11 is high and the cost is high.

On the other hand, the conventional method shown in FIG. 11 leads to an increase in cost because an electromagnetic clutch is interposed. Furthermore, since the motor used in the motor unit has a variation in the current load characteristic, there is a problem that the operating force of the protection when an external force is applied to the receiver main body 100 varies due to the variation. Further, since grease and oil are used in the motor, problems such as variations in load characteristics due to changes in temperature and inability to obtain uniform temperature characteristics arise, and it is necessary to take measures for temperature compensation. Further, for this reason, there is a disadvantage that a stable and reliable protection operation cannot be performed with respect to an external force.

In addition, in Japanese Utility Model Laid-Open No. 1-73876, a "rotary table" includes a television receiver platform that is driven to rotate by the power of a prime mover. A swing device has been disclosed that separates a motor to prevent human damage due to forced rotation and enables smooth rotation by external force when the motor is stopped. However, in this device, when the restraint on the mounting table is performed, the connection between the transmission bodies in the power transmission mechanism can be disconnected, but the motor as the prime mover remains activated. However, there is a problem that the windings are burned out due to the overload applied to the motor, and that the normal operation of the drive circuit is hindered. Further, even if the transmission members are separated from each other, actually, a pair of transmission members that are normally in an engaged state slide and rotate, and one transmission member exerts a frictional force accompanying sliding friction on the other transmission member. Since the continued half-clutch state continues to be forced, there is a problem that friction and poor rotation are likely to occur between the transmission members, and the long-term restraint easily damages the power transmission mechanism. In such a half-clutch state, the joining state in which the projection engages with the groove and the disengagement state in which the projection separates from the groove are repeated. Damage cannot be ignored, and it is clear that continuous operation against pulsating loads shortens the life of the motor.Whether or not safety measures include protection of the motor is not limited to differences in design items, it is not merely a matter of design. This is an important matter as to whether there is a philosophy as to whether or not to operate the device properly, and it is clear that this is a large factor that determines the superiority and inferiority of the design philosophy.

Japanese Utility Model Laid-Open Publication No. 1-103979, entitled "Rotating device with elevation adjustment device for television receiver", also discloses a swing device that enables the same safety measures and manual rotation as described above. However, no measures have been taken to cut off the power supply to the motor when the mounting table has been restrained, and it must be said that the design concept is inferior.

INDUSTRIAL APPLICABILITY The present invention provides an auto-swing mechanism for a display device, which enhances the degree of freedom in device design and design, protects the motor due to variations in load characteristics, eliminates instability and variations in operating force, and provides stable and reliable protection. The purpose is to give an action.

Means for Solving the Problems A first object of the present invention is to provide an installation base on which a display device is mounted and supported, and a display device which is disposed inside the display device and which is driven within a predetermined angle range by motor power. A motor unit to be swung, and an external force which is disposed in the power transmission path of the motor in the motor unit so as to be connected / removable and which prevents the swing motion from being applied to the swinging display device. A contact / separation unit that is displaced in the direction of disengagement from the power transmission path against the urging force of a spring and cuts off the power transmission, and a displacement detection that mechanically detects the displacement of the contact / separation unit in the disengagement direction. Means, and control means for stopping the motor based on a displacement detection signal from the displacement detection means. Further, in the first problem solving means, the control means includes a control circuit responsive to a remote control signal for controlling driving / stopping of the motor of the motor unit.

According to a second aspect of the present invention, there is provided an installation base, a circular rack concentrically arranged on a circumference centered on the installation point on the installation base, and a display device as a pedestal, A movable base supported on the installation base so as to be capable of reciprocating swinging about a pivot point installed on the installation base; and a movable base pivotally mounted on the movable base and having a predetermined angular range by motor power. Motor having a pinion connected to the motor via a driving force transmission mechanism, and a motor pivotally mounted on the movable base so that the pinion can revolve in a direction in which the pinion meshes with or separates from the circular rack. A unit, a spring for urging the motor unit in a direction in which the rack and pinion meshes with each other, and a spring for holding the meshing; Displacement detection means for detecting the rotation displacement when the rotation is displaced in the direction to cancel the combination, and control for providing a stop signal to the motor of the motor unit in response to the input of the displacement detection signal of the displacement detection means Means, when an external force for preventing the swing motion is applied, the motor unit opposes the urging force of the spring,
The rack and pinion are rotated by a predetermined angle in the direction of the force for releasing the engagement of the rack and pinion generated in proportion to an external force.

In the second means for solving the problems, a rotation fulcrum of a motor unit is set on an extension of a common tangent of a circular rack and a pinion, and a rack and pinion proportional to an external force is provided outward in a normal direction orthogonal to the common tangent. In addition to the setting to generate a force for releasing the meshing of the gear, when the releasing force exceeds the biasing force of the spring, the mo unit is rotated by a predetermined angle in the releasing direction of the rack and pinion. It is included in the technical features of the invention. Furthermore, in the second means for solving the problems, the motor unit is provided with a fine adjustment mechanism for adjusting the spring pressure of the spring.

A third object of the present invention is to provide a movable base supported on a base on which a display device is mounted so as to be reciprocally swingable on a base about a pivot point set on the base, and a movable base on the base. A circular rack concentrically arranged on a circumference centered on the pivot point, connected to a motor of the motor unit via a drive transmission mechanism, and meshing with the circular rack to form a rack gear; A pinion that revolves while rotating by receiving the driving force of the motor, and clutch means that is interposed on a driving force transmission path of the driving force transmission mechanism and connects and disconnects the driving force of the motor on the transmission path; One of the members of the clutch means is urged in a direction of joining the other member, and when an external force applied to the drive force transmission mechanism exceeds a predetermined value, the elastic force changes in a direction in which the joining of the clutch means is disengaged by the external force. And a control unit for providing a stop signal to the motor of the motor unit based on an input of the displacement detection unit of the detection unit. ing.

Then, when an external force for preventing the swing movement is applied during the swing operation of the display device, one member of the clutch means receives a force generated in proportion to the external force, and resists the urging force of the spring against the other member. Then, it is configured to be displaced by a predetermined amount in a direction in which the joint is separated. In the third problem solving means, a fine adjustment mechanism for adjusting the spring pressure of the spring is provided at an intermediate portion of the driving force transmission path of the driving force transmission mechanism.

In the first technical means of the present invention, when an external force for preventing the swing movement is applied to the display device during the swing operation of the display device, the force generated in proportion to the external force causes the contact / separation device to resist the urging force of the spring. And displaced in the direction to release the joint. This displacement is detected by the detecting means, and the motor of the motor unit is stopped based on the detection signal. At the same time, the swing operation stops. Further, in the second technical means, when an external force for preventing the swing motion is applied to the device during the swing operation of the display device, the external force is proportional to the external force in a normal direction orthogonal to a common tangent line between the circular rack and the pinion. Forces arise. The force generated in proportion to the external force is a force and a moving force of the relief to disengage the pinion from engagement with the circular rack. When the force in the disengagement direction becomes larger than the urging force of the spring that holds the rack and pinion in the meshed state, the motor unit rotates the fulcrum at a predetermined angle in the direction of releasing the meshing of the rack and pinion against the spring. Rotationally displaces. This displacement is detected by the detection means, and a stop signal is sent from the control means based on the detection signal, and the motor is stopped by the signal. At the same time, the swing operation stops.

Further, in the third technical means, when an external force for preventing a swing motion is applied to the display device during the swing operation of the display device, the rotation is prevented while the pinion is engaged with the circular rack. Due to the reaction force of the rotation lock and the torque transmitted from the motor, a force acts in a direction to disengage one member of the clutch means on the transmission path from joining with the other member. The force for disengaging this joint is proportional to the transmission torque of the motor. When the force for disengaging the joint exceeds the spring pressure of the spring, one member is displaced in the disengaging direction by a predetermined amount from the other member against the spring. Thereby, the driving force transmission path of the motor is cut off. At the same time, the displacement of one member of the clutch means is detected by the detection means, and a stop signal is sent from the control means to the motor based on the displacement detection signal. Then, the motor stops. At the same time, the swing operation stops.

As described above, when the swing operation is prevented, the motor stops substantially at the same time, and at the same time, the swing operation stops. In the second and third technical means, by appropriately operating the fine adjustment mechanism, the spring pressure of the spring can be adjusted to a desired value.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1, 2 and 3 show an example in which the autoswing device according to the present invention is applied to a TV set.

1 and 2, a pivot 21 is erected at the center of the front end of the installation base 20. A circular rack 22 having a pivot 21 as a radial center P is provided on one side of the installation base 20. That is, the circular racks 22 are arranged concentrically on a circumference having the center P of the pivot 21 as the center of the radius. Rack teeth are formed on the outer peripheral surface of the circular rack 22. Further, a guide rail 23 having the center P of the pivot 21 as a radial center is fixed on the installation base 20.

On the installation base 20, a movable base 24 to which the TV set main body 100 of the TV set is assembled is supported. The movable base 24 is pivotally attached to the center of the front dovetail by a pivot 21 and is supported so as to be able to reciprocate on the surface of the installation base 20 about the pivot 21. Rollers 25... Fitted and guided by the guide rails 23 are attached to the lower surface of the movable base 24.

A motor unit 30 is mounted on one side of the movable base 24 corresponding to the circular rack 22. The motor unit 30 is configured as follows. The motor 31 is mounted on one side inside the casing 300. The pulley 32 is fixed to a shaft 311 of the motor 31. A worm 33 and a large-diameter pulley 34 are coaxially and rotatably supported at positions spaced apart from the motor 31 by a predetermined distance. A belt 35 is stretched between a pulley 32 of the motor 31 and a pulley 34 of the worm 33. A first gear block 36 is rotatably supported on the side of the worm 33 with its central axis perpendicular to the base surface. First gear block
A worm wheel 361 is formed integrally with the upper end of 36, and a small diameter spur gear 362 is formed integrally with the lower end. However, the worm wheel 361 and the small-diameter gear 362 may be individually assembled separately. The worm wheel 361 at the upper end meshes with the worm 33 to form a worm gear. Further, a second gear block 37 is disposed at a position spaced apart from the first gear block 36 inside the casing by a predetermined distance. The second gear block 37 is assembled with the central axis perpendicular to the base surface. The second gear block 37 has a large-diameter spur gear 371 at the upper end and a small-diameter pinion 372 at the lower end. Pinion 372 at the lower end is movable base 24
Through the insertion hole 241 formed at the bottom, it protrudes downward from the base, meshes with the circular rack 22 on the installation base 20, and can move in the direction of meshing / separating with the circular rack 22. Second
An intermediate portion of the gear block 37 penetrates the bottom plate 301 of the casing 300 at an upper portion of the insertion hole 241 and is rotatably supported by the bottom plate 310. The large diameter gear 371 meshes with the small diameter gear 362 of the first gear block 36. Belt pulley 3
2, 34, 35, worm gears 33, 361, and spur gears 362, 371
Thus, a (drive) power transmission mechanism that transmits the driving force of the motor 31 to the pinion 372 is configured. That is, the pinion 372 is connected to the motor 31 via this power transmission mechanism. The motor 31, the pinion 372, and the power transmission mechanism are integrally assembled in the casing 300.

One end side and the other end side of the casing 300 are bent in an L shape, and projecting pieces 301 and 302 are formed to project from both sides.
One end of one protruding piece 301 of the gaming 300 is pivotally mounted on the movable base 24 by a pin 38.

The motor unit 30 is connected to the pin 38 via the casing 300.
In other words, the pinion 372 is pivotally mounted on the surface of the base 24 in a direction in which the pinion 372 meshes with the circular rack 22 and separates from the meshing, with the center of the pin 38 as the pivot point Q. ing. Tongue piece 3 on one side of casing 300
03 is projected, and the screw shaft 39 is inserted into the tongue piece 303. An adjustment nut 40 is screw-fitted to the screw shaft 39. The adjustment nut 40 is locked on the tongue piece 303. The other end of the spring 41 is attached to one end of the screw shaft 39. One end of the spring 41 is fixed on the movable base 24. The pinion 372 is urged by the motor unit 41 in a direction in which the pinion 372 meshes with the circular rack 22. For this reason, the circular rack 22 and the pinion 372 normally keep meshing with each other by the spring force of the spring 41. A fine adjustment mechanism is constituted by the screw shaft 39 and the adjustment nut 40, and the spring pressure of the spring 41 can be finely adjusted as needed by screwing the adjustment nut 40. The spring pressure of the spring 41 is set to a size that allows the pinion 372 to maintain the engagement with the circular rack 22 via the casing 300 of the motor unit 30.

The support member 42 is fixed on the movable base 24 on the other protruding piece 302 side of the casing 300. A displacement detection switch 43, for example, a micro switch is mounted on the support. The operation lever 430 of the detection switch 43 projects in the direction of the casing 300, and faces the dog 304 projecting from the surface of the casing 300 so as to be able to abut. The detection switch 43 is connected to a control circuit described later. The solid line in FIG. 3 is the detection switch 43.
Indicates an off state. Casing 300 of support 42
An inverted L-shaped guide piece 420 is provided at the lower end corresponding to
It is formed to extend in the direction of 00. A clearance C is formed at a fixed interval between the guide piece 420 and the base surface of the movable base 24, and the casing C is formed in the clearance C.
The other protruding piece 302 of 300 is inserted. Guide piece 420
Regulates and guides the rotation of the casing 300 on the base surface with the pin 38 as a fulcrum via the protruding piece 302, and moves the motor unit 30 through the casing 300 through the movable base 24.
The location is regulated.

As shown in FIG. 4, the center of the pitch circle P1 of the circular rack 22 is the center P of the pivot 21 of the installation base 20, that is,
It coincides with the pivot point P of the movable base 24 to the base 20. When the pinion 372 is correctly engaged with the circular rack 22, the contact point between the pitch circle P1 of the rack 22 and the pitch circle P2 of the pinion 872 and the pivot point P of the movable base 24, that is,
A line connecting the radial center (= center of the pivot 21) P of the circular rack 22 is a normal line N to a common tangent line T of the two pitch circles P1 and P2.
And is connected to the center O of the pinion 372. On the extension of the common tangent line T, the pivot point Q of the motor unit 30 (the center of the pin 38 on which the casing 300 is pivoted) is set. With such a setting, when the motor unit 30 is rotated in the direction in which the pinion 30 engages with and disengages from the circular rack 372, the rotation can be reliably performed by an accurate operation.

When an external force for preventing the swing movement is applied during the swing operation of the receiver main body 100, a force proportional to the external force, that is, a force F2 for disengaging the pinion 372 from the engagement with the circular rack 22 has a normal line N2. (In relation to the center of the circular rack 22). On the other hand, the force F1 for maintaining the meshing of the rack and pinion 22, 372 by the spring pressure of the spring 41 acts inward in the direction of the normal line N. When these two forces F1 and F2 are in opposition, the rack and pinion
22, 372 are maintained in a properly engaged state. That is, in the normal use state, the two forces F1 and F2 are balanced, and the relationship of F1> F2 is maintained, and the pinions 22 and 372 are correctly engaged.

In the above configuration, the fifth operation is performed by operating the remote control 200.
As shown in the figure, when a signal is transmitted to the light receiving unit 101 of the receiver main body 100, a command signal is transmitted from the control circuit 102 to the drive circuit 103 in response to the signal from the light receiving unit 101. The motor unit 30 is rotationally driven from the drive circuit 103 based on the command signal. The driving force is the belt pulley 32, 34,
The power is transmitted to the pinion 372 via a power transmission mechanism including the worm gear 33, the worm gears 33, 361, and the spur gears 362, 371. When the pinion 372 is rotated in mesh with the circular rack 22,
Since the circular rack 22 is fixed on the base, the pinion 372 revolves while rotating, and is sent in the circumferential direction of the circular rack 22. The pinion 372 engages with the rack 22 and
When revolving, a feeding force F3 for swinging the movable base 24 is generated accordingly. This feed force F3 occurs in the direction of the common tangent line T in FIG. 4, and is transmitted to the movable base 24 through the motor unit 30. The movable base 24 has a feed force F3
In response, as shown by the arrow in FIG. 1, the swing operation is started around the pivot point P on the installation base 20. When the operation of the remote controller is stopped at the position where the movable base 24 swings by the predetermined angle, the motor 31 of the motor unit 30 stops, and at the same time, the swing operation of the movable base 24 stops. By the swing operation of the movable base 24, the receiver main body 100 is automatically swung in one direction by a predetermined angle, and the screen thereof is changed to a desired direction.

The swing movement is prevented during the swing operation of the movable base 22, but when an external force is applied to the receiver body 100, the body 1
The 00 automatic swing is blocked. When the swing operation is prevented, the rotation and rotation of the pinion 372 are stopped because the circular rack 22 is fixed on the installation base 20. However, since the motor 31 continues to rotate, the driving force is transmitted to the pinion 372 via the power transmission mechanism, and the force F2 for disengaging the pinion 372 from engagement with the circular rack 22 is proportional to the external force. Join. This pinion 372
As described above, the force F2 for causing the disengagement is generated outward in the direction of the normal line N in FIG. Force F2 to disengage this meshing
Are rack and pinion 22, 37 by spring pressure of spring 41
When the force F2 is larger than the force F1 for maintaining the meshing of 2, the force F2
As shown by arrows in FIG. 1 and FIG. 3 around the rotation fulcrum Q at which the motor unit 30 is
The pinion 372 is swung by a predetermined angle in a direction to disengage from the engagement with the circular rack 22. However, the engagement does not come off.
When the motor unit 30 swings by a predetermined amount of displacement, the operating lever of the detection switch 43 is driven by the dog 304 of the casing 300.
430 is pushed in and detection switch 48 is turned on. The swing displacement of the motor unit 30 is detected. Motor unit
The swing range of 30 is set to a range in which the rack and pinion 22, 372 can maintain the meshed state without being disengaged.

The displacement detection signal of the detection switch 43 is input to the control circuit 102 as shown in FIG. 5, and a command signal is sent to the drive circuit 103 based on the input. The drive circuit 103 gives a stop signal to the motor 31 of the motor unit 30 according to the command signal, and stops the motor 31. When the motor 31 stops, the swing operation of the movable base 24 stops simultaneously. That is, when an external force is applied during the swing operation and the swing motion is prevented, the motor 31 stops substantially at the same time by detecting the swing displacement of the motor unit 30, and the swing operation of the receiver main body 100 stops at the same time. . This can prevent the auto-swing mechanism from being damaged due to overload. Also,
Ensure user safety.

A power transmission mechanism for transmitting the driving force of the motor 31 to the pinion 372, for example, an electromagnetic clutch
When an external force is applied during auto-swing, a switching signal may be provided from the drive circuit 103 to the electromagnetic clutch 44, and the electromagnetic clutch 44 may be disconnected simultaneously with the stop of the motor 31. With this configuration, the return operation is easy and can be performed smoothly.

FIG. 6 shows another embodiment of the auto-swing device according to the present invention. In this embodiment, the main points different from the above embodiment are that the motor unit is fixed on the base, and the middle of the driving force transmission path of the motor inside the unit according to the magnitude of the force generated by the external force. The provision of a clutch means for releasing, the biasing of the clutch means in the direction of joining by a spring, and the setting of the spring pressure to a size for holding the joining, the displacement of one member of the clutch means inside the unit Is detected, and the motor is stopped by detecting the displacement.

In FIG. 6, a motor unit 50 is mounted on the movable base 24 at a position corresponding to the circular rack 22. The motor unit 50 forms a main part of the auto-swing mechanism, and receives a driving force of the motor so that the receiver main body 100 performs a swing operation via the movable base 24.

The casing 500 of the motor unit 50 is divided into upper and lower chassis 510 and 520, and the upper and lower chassis 510 and 520 are integrated by being screwed on side surfaces. Lower chassis
520 is fixed to the movable base 24 with screws. The motor 51 is mounted on one side inside the upper chassis 510. A small-diameter pulley 52 is attached to the shaft 511. Motor 5
A worm 53 and a large-diameter pulley are coaxially and integrally assembled at a position separated by a predetermined center distance from 1. Large and small pulleys 5
A belt 55 is stretched between 2 and 54. A shaft 56 is arranged vertically on one side of the worm 5.
The upper end of the shaft 56 penetrates the upper surface of the upper chassis 520 and is fixed by caulking. The lower end of the shaft 56 is fitted to the lower chassis 510.

A first gear block 57 is fitted on the upper portion of the shaft 56. A worm wheel 571 formed on the first gear block 57 meshes with the worm 53 to form a worm gear. Worm wheel of first gear block 57
The other member 582 of the clutch means 58 is formed in an annular shape below 571. An uneven tooth portion 5 is provided on the lower end surface of the other member 582.
82A are formed in a crown gear shape in the circumferential direction.

A second gear block 59 is loosely fitted to a lower portion of the shaft 56. A small-diameter spur gear 59 is provided below the second gear block 59.
1 is formed. One member 581 of the clutch means 58 is formed in an annular shape at the upper end of the second gear block 59. An uneven tooth portion 581A on the upper end surface of one member 581
Is formed in a crown gear shape. The teeth 581A are engaged with the teeth 582A of the other member 582. A dog surface 581B is formed at a lower portion of one of the members 581, and is opposed to an operation lever 610 of the detection switch 60 such as a micro switch provided on a side wall of the upper chassis 510 so as to be in contact therewith. The inside of the small diameter gear 591 of the second gear block 59 is formed as a hollow 592 that opens downward, and a shaft cylinder 593 projects downward at the center of the inner bottom. On the other hand, a spring receiving seat 61 is fitted to the lower end of the shaft 56. An adjustment hole 240 is formed through a portion of the movable plate 24 corresponding to the shaft 56 and the receiving seat 61. The adjustment screws 62 are screwed into the screw holes 520A of the lower chassis 520 through the adjustment holes 240. The tips of the adjusting screws 62 are pressed against the lower surface of the flange 611 of the receiving seat 61 through the screw holes 520A. The adjustment screws 62 are arranged at two, three, or four locations in the circumferential direction around the shaft 56.

The shaft cylinder 593 and the receiving seat of the hollow portion 592 of the second gear block 59
A spring 63 is mounted on the outer periphery of the shaft 56 between the 61 shaft cylinders 612. The lower end of the spring 63 is the shaft cylinder of the receiving seat 61
It is externally fitted to 612 and locked on the surface of flange 611. The upper end of the spring 63 is in the hollow of the second gear block 59.
It is externally fitted to the shaft cylinder 593 of 592 and is locked to the base surface of the shaft cylinder 593. The second gear block 59 is urged upward by the spring pressure of the spring 63. By this biasing force, the tooth portions 581A of one member 581 of the clutch means 58 are formed.
Are engaged with the tooth portions 582A of the other member 582,
It is held in a meshed state. That is, the second gear block 59 is loosely fitted to the shaft 56 so as to be slidable up and down, and is normally held at a position moved upward by the spring pressure of the spring 63. Then, one member 581 of the clutch means 58 is driven by the urging force of the spring 63 so that the tooth portions 581A.
.The other member 58 through meshing with the tooth portion 582A.
It is biased and held in a state of being joined to 2.

A receiving seat 61 attached to the lower end of the shaft 56, a screw hole 520A of the lower chassis 520, and the screw hole 520A
The fine adjustment mechanism for adjusting the spring pressure of the spring 63 is constituted by the adjustment screws 62 screwed into. This fine adjustment mechanism corresponds to the fine adjustment mechanism shown in the first embodiment.

First and second gear blocks inside the motor unit 50
A shaft 64 is vertically supported on one side of 57 and 59. The upper end of the shaft 64 passes through the upper surface of the upper chassis 520, and is caulked to this upper surface. shaft
The lower end of 64 penetrates the upper surface of the lower chassis 510, and extends downward through the insertion hole 241 of the movable base 24 therebelow. A third gear block 65 is rotatably fitted to and supported by a protruding portion of the shaft 64 extending downward from the lower chassis 510. The lower end of the shaft 64 protrudes from the lower end surface of the third gear block 65, and this protruding portion is fixed by a C-shaped retaining ring. A large-diameter spur gear 651 is integrally formed at the upper end of the third gear block 65.
The spur gear 651 is a small diameter spur gear 591 of the second gear block 59.
And are engaged. The movable base of the third gear block 65
A pinion 652 similar to the above is integrally formed at a protruding end portion downward from 24. Pinion 652 is installed base 20
It is engaged with the upper circular rack 22. Pinion 652
Receives the driving force of the motor 51 and revolves around itself while engaging with the circular rack 22. With this rotation and revolution, the receiver
The feed force required for 100 swing operations is transmitted to the movable base 24.

The above belt and pulley 52, 54, 55, worm gear 53,
A power transmission mechanism for transmitting the driving force of the motor 51 to the pinion 652 is constituted by the 571 and the large and small spur gears 591 and 651. The pinion 652 is connected to the motor 5 via this power transmission mechanism.
Connected to one.

The clutch means 58 is interposed on the driving force transmission path of the power transmission mechanism. That is, the clutch means 58 is interposed between the first and second gear blocks 57, 59 constituting the power transmission mechanism. Then, one member 581 and the other member 582 are joined and separated according to the normal time and when an external force is applied during the swing operation, and the power transmission path is connected and disconnected.
Has the role of disconnecting.

In order to adjust the spring pressure of the spring 63 using the fine adjustment mechanism, the adjusting screws 62... Equally arranged through the insertion holes 241 of the movable base 24 are screwed by a predetermined amount, and the screw tips are pressed. The receiving seat 61 may be moved up or down against the spring 63. This allows the spring
63 spring pressure can be adjusted to the desired strength.

In the above configuration, when a signal is transmitted to the light receiving section 101 of the receiver main body 100 by operating the remote controller 200 as shown in FIG. 5, the motor 51 of the motor unit 50 receives the drive signal from the drive circuit 103 in the same manner as described above. Driven to rotate. The driving force (transmission torque) f is transmitted to the pinion 652 via the power transmission mechanism, and the pinion 652 revolves and revolves while engaging with the circular rack 22, and the pinion 652 is rotated by the circular rack 2.
Sent in the circumferential direction of 2. This feed force is applied to the motor unit 50 via the power transmission path and to the motor unit 50.
To the movable base 24. Then, the movable base 24
Performs a predetermined angle swing operation about the pivot point P. Then, when the operation of the remote controller is stopped at the position moved by the predetermined angle, the screen of the receiver main body 100 can be variably adjusted in a desired direction.

When an external force is applied to the receiver main body 100 during the swing operation and the swing operation is prevented, the rotation and rotation of the pinion 652 are stopped. The rotation of the pinion 652 is a circular rack 2
When the rotation is blocked by the engagement with 2, the rotation of the power transmission mechanism from the pinion 652 to one member 581 of the clutch means 58 is locked. On the other hand, since the motor 51 continues to rotate, the driving force f is applied to the other member 58 of the clutch means 58.
2, and transmitted from the other member 582 to one member 581. However, since the rotation of one member 581 is locked, when the driving force f is transmitted, the reaction force of the one member 581 resists the spring pressure of the spring 63 in a direction to release the joining with the other member 582. Moving. FIG. 7 shows the relationship between the driving force (transmission torque) f of the motor 51 and the force for moving the first member 581 in the detaching direction. The driving force f is determined by the one member 581 and the other member 582. Meshed teeth 58
It occurs in the direction perpendicular to the tooth surfaces of 1A and 582A. On the other hand, the tooth 58
The force f2 for disengaging the meshing of 1A and 582A is the driving force f
When the angle between the rotational force f1 generated by the driving force f and θ is θ, it is expressed by the equation f2 = f · sin θ. As is clear from this, there is a certain proportional relationship between the driving force f and the force f2 to be disengaged. The detaching force f2 acts axially below the shaft 56. When this force f2 exceeds the spring pressure of the spring 63, the mutual tooth portions 581A
.., 582A, one member 581 within the range of engagement
Is displaced from the other member 582 against the spring 63 (see FIG. 8). When one member 581 is displaced in a direction to separate from the other member 582, the dog surface 581 is displaced.
B pushes operation lever 610 of detection switch 60 and switches
Turn on 60. Thereby, the displacement of one member 581 of the clutch means 58 is detected. This displacement detection signal is input to the control circuit 102. Then, similarly to the above, the motor 51 is stopped by the stop signal from the drive circuit 103, and at the same time, the automatic swing operation is stopped.

As described above, when the swing operation is prevented by the external force during the swing operation, the motor 51 is stopped simultaneously with the detection of the displacement of one member 581 of the clutch means provided in the power transmission path inside the motor unit, and the automatic swing operation is performed. Is released.

As the detection switch, not only a microswitch but also other mechanical displacement detection switches can be used.Also, a switch that detects by optical means can be used sufficiently. In the second embodiment shown in FIG. 6, the spring and the fine adjustment mechanism of the spring pressure are arranged upside down with respect to the one shown in the figure, and are arranged at the upper portion of the upper chassis side to reduce the spring pressure of the spring from above the casing. It is also possible to adopt a structure that allows fine adjustment.

Effects of the Invention As described above, according to the present invention, when an external force is applied, it is possible to reliably prevent the swing mechanism from being damaged by an overload, and to sufficiently secure the safety of the user,
Protection measures can be fully achieved. In addition,
According to the present invention, there are the following remarkable effects.

Since the arrangement of the auto-swing mechanism and the fulcrum of the swing operation of the device can be freely selected and set, the degree of freedom in device design is improved.

Since the protection function against external force can be realized without relying on electrical elements, stable and reliable protection is achieved by eliminating the variation and instability of the protection operation caused by the variation in the current load characteristics of the motor and the variation in the load characteristics due to temperature. Action can be taken.

When the display device is restrained and stops rotating during the swinging movement, the displacement of the contact / separation means in the detaching direction is captured and the power to the motor is cut off, so for example, without turning off the power to the motor. As when left unattended, the contact / separation means continues to intervene in the power transmission system in a semi-separated state without causing mechanical wear of the members or pulsating load on the motor, and each component of the power source and the power transmission system Eliminate the inconvenience of overusing elements in special environments,
Stable operation can be guaranteed for a long period of time.

The present invention is widely applicable not only to the auto-swing mechanism of the TV set of the TV set, but also to the auto-swing mechanism of other display devices.

[Brief description of the drawings]

FIG. 1 is a plan view in which an automatic swing mechanism according to the present invention is applied to a TV set, FIG. 2 is a cross-sectional view of a main part thereof, FIG. 3 is a plan view of the same main part, and FIG. FIG. 5 is a schematic diagram illustrating the principle, FIG. 5 is a block diagram showing a circuit configuration of a control unit used in the present invention, FIG. 6 is a cross-sectional view of a main part showing another embodiment of the present invention, and FIG. FIG. 8 is a schematic diagram for explaining the operation, and FIG.
FIG. 11 is a perspective view showing a conventional example. 100 receiver body (display device) 20 installation base P pivot point 24 movable base 22 circular rack 30, 50 motor unit 31, 51 motor power transmission mechanism 32, 34 , 35 Belt pulley 33, 361 Worm gear 362, 371 Spur gear Power transmission mechanism 52, 54, 55 Belt pulley 53, 571 Worm gear 591, 651 Spur gear 372, 652 … Pinions 43, 60… Detection switch 58… Clutch means 581… One member 582… The other member 102 …… Control circuit 103 …… Drive circuit 44 …… Electromagnetic clutch

Claims (6)

(57) [Claims] An installation base on which the display device is mounted and supported; a motor unit disposed inside the display device for swinging the display device within a predetermined angle range by motor power; When an external force for preventing the swing motion is applied to the swinging display device, the power transmission force is opposed to the biasing force of a spring when the external force is applied to the display device which is swinging and movable. A contact / separation unit that displaces from the path in the detachment direction and cuts off the power transmission, a displacement detection unit that mechanically detects the displacement of the contact / separation unit in the detachment direction, and a displacement detection signal from the displacement detection unit. Control means for stopping the motor on the basis of the control signal. 2. The automatic swing of a display device according to claim 1, wherein said control means includes a control circuit responsive to a remote control signal for controlling driving / stopping of a motor of said motor unit. apparatus. 3. An installation base, a circular rack concentrically arranged on a circumference centered on the pivot point on the installation base, and assembled as a pedestal to a display device, and set on the installation base. A movable base supported on the installation base so as to be reciprocally swingable about the pivot point, a motor pivotally mounted on the movable base, and swinging the movable base within a predetermined angle range by motor power; and Having a pinion connected to the motor via a drive power transmission mechanism,
A motor unit pivotally mounted on the movable base so that the pinion can revolve in a direction in which the circular rack meshes or disengages, and biases the motor unit in a direction in which the rack and pinion meshes, and holds the meshing A spring to be disengaged, displacement detecting means for detecting the rotational displacement when the motor unit is displaced in a direction for releasing the engagement of the rack and pinion, and responding to the input of the displacement detection signal of the displacement detecting means. Control means for providing a stop signal to the motor of the motor unit, and when an external force for preventing the swing motion is applied, the motor unit is generated in proportion to the external force against the urging force of the spring. Wherein the rack and pinion are rotated by a predetermined angle in the direction of the force for releasing the meshing of the rack and pinion. Apparatus. 4. A rotation fulcrum of the motor unit is set on an extension of a common tangent between the circular rack and the pinion, and is proportional to an external force for releasing the engagement of the rack and pinion outward in a normal direction orthogonal to the common tangent. Wherein the motor unit is rotated by a predetermined angle in the rack / pinion release direction when the release force exceeds the biasing force of the spring. Item (3): An automatic swinging device for a display device according to Item (3). 5. An electromagnetic clutch is interposed in the middle of a driving force transmission path of a power transmission mechanism, and a "disengage" command signal is sent from the control means to the electromagnetic clutch based on a displacement detection signal of a detection means. The auto-swing device for a display device according to claim 2, wherein: 6. An auto-swing device for causing a display device mounted on an installation base to swing in a predetermined angle range in a direction in which a screen is changed by a predetermined angle by driving a motor of a motor unit disposed inside the device. A movable base that is mounted on a display base on which the display device is mounted so as to be able to reciprocate and swing around the pivot point set on the installation base, and the pivot point on the installation base is defined as a radial center. A circular rack concentrically arranged on a circle to be connected to the motor via a driving force transmission mechanism, meshing with the circular rack to form a rack gear, and receiving the driving force of the motor. A pinion that revolves while rotating, and clutch means that is interposed on a driving force transmission path of the driving force transmission mechanism and connects and disconnects the driving force of the motor on the transmission path. When the external force applied to the driving force transmission mechanism exceeds a predetermined value, the one member of the clutch means is urged in a direction of joining the other member, and when the external force exceeds a predetermined value, the elastic force is displaced in a direction in which the engagement of the clutch means is disengaged. A spring, a detecting means for detecting disengagement / displacement of one member of the clutch means from the other member, and a control means for providing a stop signal to the motor based on a displacement detection signal input from the detecting means. When an external force for preventing the swinging motion is applied, one member of the clutch means receives a force generated in proportion to the external force and is displaced by a predetermined amount in a direction to disengage the joint against the urging force of the spring. An auto-swing device for a display device, characterized in that: