JPH0547358Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a coaxial panning device that supports a camera and rotates it at a constant speed.

<<Prior Art>> Conventionally, a panning device is generally known that has a speed reduction device in a fixed part and rotates a camera attached to a movable part at a constant speed.

In the reduction mechanism built into this type of panning device, the size (number of gear teeth) and combination of number of reduction gears are set according to the ratio to be decelerated, and the combination of reduction gears is set according to the arrangement position of these gears. The entire structure is made up of a support shaft attached.

[Problem that the invention aims to solve] However, in a panning device equipped with a deceleration mechanism structured as described above, the size of each gear of the deceleration mechanism differs depending on the set rotational speed of the camera. Therefore, there are problems in that the number of types of gears increases, and only one type of reduction ratio can be set, and a panning device with a reduction mechanism suitable for each setting must be manufactured.

Further, if the types of gears in the speed reduction mechanism and the arrangement positions of the support shafts are different, the speed reduction mechanism becomes bulky, which causes the problem that the panning device becomes large.

An object of the present invention is to provide a coaxial panning device that is compact and can freely adjust the reduction ratio according to different settings.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a fixed part that is fixed to a wall, etc., and a movable part that is supported by the fixed part and rotates at a constant speed while supporting the camera. and a deceleration mechanism provided in the fixed part, the deceleration mechanism having an input shaft from a drive source and an output shaft for rotating the movable part coaxially disposed, and a large diameter part and a small diameter part. A plurality of reduction gears having two stages of externally toothed spur gears, all of the same shape, are combined between the input shaft and the output shaft with their large diameter portions and small diameter portions meshing with each other, and are equally spaced from each other in an equilateral triangular shape. It is characterized by being inserted and supported by a support shaft disposed in the.

<<Operation>> The number of reduction gears of the reduction mechanism in the fixed part is selected according to the ratio to be decelerated, and these are inserted into support shafts arranged in an equilateral triangle shape and connected in sequence. As a result, a desired reduction ratio can be obtained, and the coaxial panning device can be easily set for different uses.

In addition, the reduction gear is arranged in an equilateral triangle shape to reduce unnecessary space and reduce the size of the reduction mechanism, which is built into the fixed part, thereby making the coaxial panning device smaller.

<<Example>> FIGS. 1 to 3 show a speed reduction mechanism built into the coaxial panning device of the present invention.
Reference numeral 1 in the figure indicates a motor as a drive device, and a speed reduction mechanism 2 is attached to this motor 1.

The deceleration mechanism 2 consists of three shafts 5, 6, 7, and three shafts 5, 6, 7.
a base 8 to which the lower ends of the shafts are fixedly supported; and an upper carrier 9 to which the upper ends of the shafts 5, 6, and 7 are fixed.
, intermediate carriers 10 and 11 disposed between the base 8 and the upper carrier 9, and a spacer 12 for supporting the intermediate carriers 10 and 11 and the upper carrier 9 at predetermined positions.

Between the base 8 and the upper carrier 9, first, second, and third support shafts 1 are arranged in equilateral triangular shapes at equal intervals.
5, 16, and 17 are attached. The first support shaft 15 (omitted in FIG. 1) is
Carrier 1 between intermediate carrier 10 and base 8
1 and are press-fitted and supported in each. The second support shaft 16 is press-fitted and supported between the base 8 and the upper carrier 9 by passing through the intermediate carriers 10 and 11, respectively. The third support shaft 17 is press-fitted and supported between the intermediate carriers 10 and 11, respectively. The reduction gear 20 has a large diameter portion 2
It is composed of two stages of externally toothed spur gears, 0a and small diameter portion 20b, and a large number of them are molded into the same shape and size. These reduction gears 20 are rotatably inserted into the first, second, and third support shafts 15, 16, and 17. Further, each of the intermediate carriers 10 and 11 is provided with one hole 21 for passing the reduction gear 20 therethrough.

To explain the specific configuration of the speed reduction mechanism 2,
It will look like this:

A pinion 4 is attached to a rotating shaft 3 of the motor 1 that serves as an input shaft to the speed reduction mechanism 2 . An auxiliary support shaft 2 is provided between the base 8 and the intermediate carrier 11.
3 is press-fitted and supported, and an auxiliary reduction gear 24 is rotatably supported on this auxiliary support shaft 23.
The pinion 4 is connected to the large diameter portion 24 of the auxiliary reduction gear 24.
a, and a first reduction gear 20c supported by the first support shaft 15 meshes with the small diameter portion 24b of the auxiliary reduction gear 24. A second reduction gear 20d supported by the second support shaft 16 meshes with the first reduction gear 20c. 2nd reduction gear 20d
is attached with its small diameter portion 20b inserted into a communication hole 11a provided in the intermediate carrier 11, and a third reduction gear 20e supported by the third support shaft 17 is attached to the second reduction gear 20d. are meshing. This third reduction gear 20e includes a fourth reduction gear 20 supported above the first reduction gear 20c of the first support shaft 15 via an intermediate carrier 11.
f is engaged. A plurality of reduction gears 20 are attached by repeating the above-described connection structure.

In this embodiment, up to the seventh reduction gear 20i is provided, and the final reduction gear 26 is connected to the seventh reduction gear 20i, and the small diameter portion 26b is connected to the intermediate carrier 10.
When inserted into the communication hole 10a provided in the 10a, they are engaged with each other. A pinion 28 of an output shaft 27 rotatably supported by the upper carrier 9 is engaged with the small diameter portion 26b of the final reduction gear 26, thereby forming the entire reduction mechanism 2.

As a result, the rotating shaft 3 of the motor 1, which is the input shaft, and the output shaft 27 are coaxially arranged.

This speed reduction mechanism 2 is fixed to the motor 1 with a screw 31 inserted into a fixing hole 30 provided in its base 8.

In this embodiment, seven reduction gears 20 are combined, and the reduction gears 20, the auxiliary gear 24, and the final reduction gear 26 reduce the speed in nine stages. The number of reduction gears 20 can be freely set according to the desired speed reduction ratio. in this case,
Since the lengths of the first, second and third support shafts 15, 16, 17 and shafts 5, 6, 7 do not match,
The lengths of these support shafts and shafts are also set in advance.

Further, in this embodiment, the rotation shaft 3 of the motor 1 and the first reduction gear 20c are connected via the auxiliary gear 24, but the third support shaft 17 is extended to the base 8 and connected to the third support shaft 17. It is also possible to attach a gear that meshes with the pinion 4 and the large diameter portion 20a of the first reduction gear 20c. In this case, the auxiliary support shaft 23 becomes unnecessary.

As shown in FIGS. 4 to 6, the deceleration mechanism 2 configured as described above is a camera support device that pans a camera attached to a ceiling or wall, such as a security camera, at a constant speed. The coaxial panning device 30 is used as a coaxial panning device 30.

To briefly explain this coaxial panning device 30, the entire structure includes a base 31 that is directly fixed to a ceiling, wall, etc., and a cylinder that is fixed to this base 31 and serves as a fixed part in which the speed reduction mechanism 2 is built. body part 3
2, and a rotating portion 33 as a movable portion that is molded separately from the cylindrical body portion 32 and is rotatably attached to the output shaft 27 of the deceleration mechanism 2.

A bracket 35 is attached to the inside of the base 31, and the base 31 is directly fixed to a ceiling, wall, or the like.

The aforementioned speed reduction mechanism 2 is built into the cylindrical body portion 32, and the cord of the motor 1 attached to this speed reduction mechanism 2 is connected to a connector 36. The output shaft 27 of the speed reduction mechanism 2 is attached to the turning section 33.

The rotating part 33 is connected to the output shaft 27 of the speed reduction mechanism 2.
The clutch portion 38 is attached to the clutch portion 38. This clutch section 38 mainly includes a rotor 39 fixed to the rotating section 33 by a screw formed on the outer periphery, a clutch disk 40 that sandwiches this rotor 39 from both sides, and a clutch disk 40 that holds this disk 40 between the rotor 39 and the rotor 39.
9, a washer 43 supported by the output shaft 27 and pressing the plate spring 42. A camera (not shown) is supported by a pivot shaft 45 and a farson base 46 attached to this rotating portion 33.

The pivot shaft 45 has its pivot 45a
is supported by a pivot holder 47, and its lower side is supported by a washer 48.
is the spring case 5 that houses the spring 49.
Supported at 0. The lower surface of the spring case 50 is supported by an operating shaft 51a having an oval cross section of the lockshaft 51.
An operating knob 52 is fixed to the externally protruding end of the holder with a screw 53. Therefore, by rotating this operating knob 52, the elliptical operating shaft 5 can be rotated.
1a presses the pivot 45a against the pivot holder 47 via the spring case 50 and the washer 48, fixes the tilt angle to the pivot shaft 45, and moves the pivot shaft 45 to the rotating portion 33.
It is fixed to and rotated together with this.

Further, as shown in FIG. 7, a protruding piece 39a is formed on the lower surface of the rotor 39 fixed to the rotating part 33, and both ends of the protruding piece 39a are formed on the inner circumference of the cylindrical body part 32. By coming into contact with the stopper piece 32a, overturning is prevented during rotation.

Between the cylindrical body part 32 and the revolving part 33, the revolving part 3
A changeover switch 54 is provided for rotating the rotor 3 in forward and reverse directions.

As shown in FIG. 4, the changeover switch 54 includes a contact base 55 attached to the output shaft 27 so as to be restricted from rotating, a contact 56 fixed to the contact base 55, and a contact 56 connected to the rotating portion 33. Printed circuit 5 that slides into contact with the rotation of the circuit 5 and changes the direction of current flow at a predetermined angle, thereby rotating the motor 1 in the opposite direction.
It consists of 7. A clutch disk 58 is interposed between the contact base 55 and the printed circuit 57, and together with the two upper clutch disks 40, prevents the clutch portion 38 from rattling.

As shown in FIG. 8, the contact base 55 is formed into a disk shape as a whole, and an annular recess 55a is formed on the lower side thereof. This recess 55a
A contact 56 is fixed by a screw 59.

The contact 56 has three legs 56a, 56
b, 56c are provided.

The printed circuit 57 connects the three legs 56a, 56 of the contact 56, as shown in FIG.
Three annular patterns 6 corresponding to b and 56c
0a, 60b, and 60c are arranged. The innermost pattern 60a is connected to both outer terminals 61a and 61b of a double-barreled switch 61. The outermost pattern 60b is connected to the positive side 1a of the motor 1, and the first pattern 60b is connected to the positive side 1a of the motor 1, and allows current to flow to the positive side 1a between this pattern 60b and the positive side 1a of the motor 1.
A diode 62 is interposed. The middle pattern 60c is also connected to the positive side 1a of the motor 1, and between this pattern 60c and the positive side 1a of the motor 1, a second diode 63 is connected in parallel with the first diode 62 so that current flows to the pattern 60c. is interposed in. The negative side 1b of the motor 1 is connected to both inner terminals 61 of the double switch 61.
c, 61d. Double switch 6
1 has a DC power supply 64 attached to both ends thereof. Note that the double switch 61 is connected to the connector 3.
6 and is installed in the monitor room.

In the coaxial panning device 30 configured as described above, the speed reduction mechanism operates as follows.

When the pinion 4 is rotationally driven by the motor 1, the large diameter portion 24a of the auxiliary gear 24 is driven by the pinion 4, and the small diameter portion 24a of the auxiliary gear 24 is driven by the pinion 4.
b drives the large diameter portion 20a of the first reduction gear 20c. The small diameter portion 20b of the first reduction gear 20c drives the large diameter portion 20a of the second reduction gear 20d, and the small diameter portion 20b of the second reduction gear 20d drives the third reduction gear 20e.
The large diameter portion 20a is driven. The small diameter portion 20b of the third reduction gear 20e drives the large diameter portion 20a of the fourth reduction gear 20f. By repeating this, the large diameter portion 26a of the final reduction gear 26 is driven, and the small diameter portion 26b drives the pinion 28 of the output shaft 27.
As a result, the rotation of the motor 1 is temporarily controlled by the auxiliary gear 2.
After being decelerated by step 4, it is decelerated by seven deceleration gears 20, and further decelerated by final deceleration gear 26, resulting in a total deceleration of nine stages. Note that this deceleration rate can be freely set by changing the number of reduction gears 20 installed.

In the coaxial panning device 30, the rotating section 33 is rotated by the output shaft 27 of the deceleration mechanism 2, and the camera fixed to this rotating section 33 pans.

At this time, the changeover switch 54 operates as follows.

In FIG. 9, when the double switch 61 is switched downward, the contacts 56 fixed to the contact base 55 rotating in conjunction with the output shaft 27 are connected to the pattern 6 of the printed circuit 53.
0a, 60b, 60c and moves to position A, and the middle pattern 60c and contact 5
6 is separated from the middle leg portion 56b, and current no longer flows.

When the double switch 61 is switched upward, the positive side of the DC power supply 64 becomes the innermost pattern 60a.
through the contact 56 at position A.
Outermost pattern 60b and first diode 62
The motor 1 is electrically connected to the motor 1 through the motor 1, and the motor 1 rotates in the forward direction. As a result, the contact 56 rotates as shown by the arrow 65, and rotates to the position B where the outermost pattern 60b and the outer foot 56c of the contact 56 are separated and no current flows, and the motor 1 is rotated. Stop. Then, the rotating section 33 is rotated and the camera is rotated until the motor 1 stops.

To rotate the camera in the opposite direction,
The double switch 61 is switched downward to connect the positive side of the DC power supply 64 to the motor 1 and the second diode 6
3, intermediate pattern 60c, innermost pattern 6
0a, and so on. This rotates the motor 1 until the contact 56 turns to position A, causing the camera to rotate.

When rotating the camera in the opposite direction midway through, the dual switch 61 is switched to the opposite direction. This causes the current flowing through the motor 1 to flow in the opposite direction, causing the camera to rotate in the opposite direction.

In addition, in the above operation, the double switch 61 is manually operated.
In the above-mentioned monitor room, a switch (not shown) is provided in order to switch the dual switch 61 automatically or manually. When set to automatic, the dual switch 61 automatically switches according to the rotation of the rotating section 33, the motor 1 continuously rotates forward and reverse, and the camera continues to rotate forward and reverse at a constant angle at a constant speed. I will do it.

As described above, in the coaxial panning device of the present invention, the reduction mechanism 2 can freely adjust its reduction ratio by changing the number of reduction gears 20.
A panning device with various deceleration functions can be formed. Furthermore, since the first, second, and third support shafts 15, 16, and 17 of the speed reduction mechanism 2 are arranged in an equilateral triangular shape, there is less wasted space within the speed reduction mechanism 2, and the entire structure can be made compact. A coaxial panning device incorporating this speed reduction mechanism 2 can be significantly downsized.

Furthermore, since the plurality of reduction gears 20 installed in the reduction mechanism 2 are all molded as parts of the same shape, the number of component parts can be reduced, and the manufacturing cost of the coaxial panning device can be reduced.

Further, since the speed reduction mechanism 2 is configured as one unit, it can be easily combined with various motors, and a coaxial panning device with different settings depending on the application can be easily designed.

<<Effects of the invention>> As explained above, according to the coaxial panning device of the present invention, the built-in speed reduction mechanism is
By changing the number of reduction gears, you can freely adjust the reduction ratio and reduce wasted space.
It has the advantage of being able to be molded into a compact size as a whole, and that the reduction ratio can be freely adjusted depending on the settings.

[Brief explanation of the drawing]

Figure 1 is a side view showing the deceleration mechanism of the present invention, Figure 2 is a side view showing the speed reduction mechanism of the present invention;
Figure 3 is a plan view of Figure 1 with the upper carrier removed, Figure 4 is a partially cutaway front view showing the camera support device incorporating the speed reduction mechanism of Figure 1. 5 is a partially cutaway side view of the camera support device shown in FIG. 4, FIG. 6 is a plan view of FIG. 4, and FIG. 7 is a partial perspective view of the rotor and cylinder body of the same device. FIG. 8 is a perspective view of the contact base assembly, and FIG. 9 is a circuit diagram of the changeover switch including the printed circuit. DESCRIPTION OF SYMBOLS 1... Motor, 2... Reduction mechanism, 3... Rotating shaft of motor 1, 15... First support shaft, 16... Second
Support shaft, 17...Third support shaft, 20...Reduction gear, 20a...Large diameter portion of reduction gear 20, 20b...
...Small diameter portion of the reduction gear 20, 27...Output shaft of the reduction mechanism 2. 30... Coaxial panning device, 31...
...Base, 32... Cylindrical body part (fixed part), 33... Swivel part (movable part).

Claims (1)

[Scope of utility model registration request] A fixed part that is fixed to a wall or the like, a movable part that is supported by the fixed part and rotates at a constant speed while supporting the camera, and a deceleration mechanism provided in the fixed part, and the deceleration mechanism is configured to drive an input shaft from a source and an output shaft for rotating the movable part are arranged coaxially,
A plurality of reduction gears having two stages of external tooth spur gears each having a large diameter portion and a small diameter portion are combined between the input shaft and the output shaft with the large diameter portion and the small diameter portion meshing with each other. A coaxial panning device characterized in that it is inserted and supported by support shafts arranged in an equilateral triangular shape at equal intervals.