KR102188677B1 - Apparatus for transmitting rotational forc in surveillance camera - Google Patents

Abstract

A device for transmitting rotational force of a surveillance camera is provided. The apparatus for transmitting rotational force of a surveillance camera according to an embodiment of the present invention includes: a motor-side pulley that rotates by a driving force of a motor; A camera-side pulley rotated by the rotation of the motor-side pulley; A timing belt connecting the motor-side pulley and the camera-side pulley to transmit power; And an idler contacting the timing belt from the outside of the camera-side pulley to provide tension so that the timing belt is in close contact with the camera-side pulley.

Description

Surveillance camera rotational force transmission device {APPARATUS FOR TRANSMITTING ROTATIONAL FORC IN SURVEILLANCE CAMERA}

The present invention relates to an apparatus for transmitting rotational force of a surveillance camera, and more particularly, by closely contacting a timing belt mounted on a surveillance camera with a camera side pulley, the rotation angle of the motor and the rotation angle of the camera are matched. It relates to a torque transmission device.

Closed circuit television refers to a television system that transmits images to a specific receiver. The transmission and reception of images is connected by wire or wireless, and is called a closed circuit television because it cannot be arbitrarily received except for the receiving object. do. A closed circuit television is basically composed of three parts: an image pickup device, a transmission device, and a display device. Recently, there is an increasing tendency to add a recording device to it.

The field of closed-circuit television systems is a surveillance camera including a CCD or CMOS imaging device for converting a monitored object into an electrical signal, a matrix switcher that displays a plurality of camera signals on an arbitrary monitor, and 4 units. A color quadratic displayer, which displays color camera signals on a single monitor, is a general product line. In addition, it is a stand alone type during installation, and has been used for purposes such as monitoring of buildings, outside of factories, and parking lot monitoring.

Surveillance cameras used in closed-circuit television systems are generally called closed-circuit cameras. As described above, a surveillance camera converts an image input through a lens into an electrical signal using an imaging element such as a CCD or CMOS, and connects a cable. It serves to transmit the converted electrical signal to a display device such as a monitor.

1 is a diagram showing a conventional surveillance camera.

Referring to FIG. 1, a surveillance camera 1 includes a camera 5 that converts an image input through a lens into an electrical signal using an image pickup device such as a CCD or CMOS therein, and includes the camera 5 The requirement of moving the camera 5 to a desired position quickly and accurately using an internal drive motor (not shown) must be satisfied. That is, the rotation angle of the camera 5 must be accurately matched with the rotation angle of the motor provided therein.

2 is a diagram showing a connection structure between a conventional motor and a camera.

2, when a control current is applied to the drive motor, the pulley 11 mounted at the end of the drive motor shaft rotates, the timing belt 13 connected thereto rotates, and finally, the pulley 12 of the camera rotation shaft Will rotate. That is, when the pulley 11 connected to the motor rotates, the timing belt 13 connected to the pulley 11 rotates, and the pulley 12 connected to the camera rotates with the rotation of the timing belt 13, thereby moving the camera. Is done. Here, as the rotation angle of the motor and the rotation angle of the camera are accurately matched, it can be said that it is an excellent surveillance camera system.

By the way, the pitch circle diameters of the pulley gear teeth 12' of the camera side and the gear teeth 13' of the timing belt 13 do not match each other, and are comprised loosely. Accordingly, as the timing belt 13 rotates, the camera-side pulley 12 may not rotate. In order to solve this problem, the tension idler 14 is placed in the middle and the bottom of the timing belt 13 so that the timing belt 13 is in close contact with the camera side pulley 12 to rotate through the rotation of the motor side pulley 11. One or two are placed.

3A is a graph showing a rotation angle of a motor and a rotation angle of a camera over time in a conventional surveillance camera, and FIG. 3B is a graph showing an error between a rotation angle of the motor and a camera rotation over time.

In order to check whether the rotation angles of each other by attaching an encoder to the motor and the camera axis are identical, the accuracy can be checked by measuring the rotational degrees and identifying the difference in angles.

3A and 3B, when the camera is rotated from 0 degrees to 190 degrees, the difference between the rotation angles of the motor and the camera is about 0.6 degrees (i.e., the rotation angle of the motor-the rotation angle of the camera). Can be seen.

Therefore, it can be seen that even if the timing belt 13 is brought into close contact with the pulley 12 by the tension idler 14, the camera side pulley 12 does not rotate as much as the timing belt 13 rotates. This is because even if the tension idler 14 is present, tension is not applied in the entire circumferential direction of the camera-side pulley 12. In addition, the pulley 12 may not rotate as the timing belt 13 rotates as the POM, which is the material of the pulley 12, contracts or increases due to the continuous operation of the timing belt 13. have.

Therefore, it is necessary to solve the loose part between the camera side pulley 12 and the timing belt 13, and this part occurs a lot in the upper part of the camera side pulley 12, which is the opposite part of the motor side pulley 11. .

Korean Patent Application Publication No. 2012-0082216 (published on 23 July 2012) Korean Patent Application Publication No. 2012-0034993 (published on April 13, 2012) Japanese Unexamined Patent Application Publication No. 2004-053919 (published on February 19, 2004)

The present invention is to solve the above problem, by arranging the idler outside the gear teeth of the pulley on the camera side, when the motor is driven to rotate the timing belt, the gear teeth of the timing belt and the gear teeth of the camera pulley are in close contact with each other to rotate the motor. It provides a rotational force transmission device of a surveillance camera that minimizes the difference in the rotation angle of the camera compared to the angle.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A rotational force transmission device for a surveillance camera according to an embodiment of the present invention for achieving the above object includes: a motor-side pulley rotating by a driving force of a motor; A camera-side pulley rotated by the rotation of the motor-side pulley; A timing belt connecting the motor-side pulley and the camera-side pulley to transmit power; And an idler contacting the timing belt from the outside of the camera-side pulley to provide tension so that the timing belt is in close contact with the camera-side pulley.

Other specific details of the present invention are included in the detailed description and drawings.

According to the present invention, by disposing an idler on the outer side of the camera side pulley, when the motor is driven and the timing belt rotates, the timing belt and the camera side pulley are in close contact, so that the rotation angle of the camera can be matched with the rotation angle of the motor.

In addition, by ensuring that the inner circle diameter of the timing belt gear teeth and the outer circle diameter of the pulley gear teeth on the camera side are accurately contacted, the angle difference due to contraction and expansion of the timing belt and pulley due to external temperature changes can be minimized. And it is possible to prevent the occurrence of an angle difference caused by a foreign substance caught in the gear teeth of the pulley on the camera side.

1 is a diagram showing a conventional surveillance camera.
2 is a diagram showing a connection structure between a conventional motor and a camera.
3A is a graph showing a rotation angle of a motor and a rotation angle of a camera over time in a conventional surveillance camera, and FIG. 3B is a graph showing an error between a rotation angle of the motor and a camera rotation over time.
4 is a view showing the structure of a rotational force transmission device for a surveillance camera according to an embodiment of the present invention.
5 is a view showing a cross section of a flange bearing used in the rotational force transmission device of the surveillance camera of FIG. 4.
6 is a view showing the structure of a rotational force transmission device of a surveillance camera according to another embodiment of the present invention.
7 is a view showing a partial cross section of the rotational force transmission device of the surveillance camera of FIG. 6.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms different from each other, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Although the first, second, etc. are used to describe various elements, components and/or sections, of course, these elements, components and/or sections are not limited by these terms. These terms are only used to distinguish one element, component or section from another element, component or section. Therefore, it goes without saying that the first element, the first element, or the first section mentioned below may be a second element, a second element, or a second section within the technical scope of the present invention.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprises" and/or "made of" a referenced component, step, operation and/or element is one or more of the other elements, steps, operations and/or elements. It does not exclude presence or addition.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used as meanings that can be commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not interpreted ideally or excessively unless explicitly defined specifically.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

4 is a view showing the structure of a rotational force transmission device of a surveillance camera according to an embodiment of the present invention. In addition, FIG. 5 is a view showing a cross section of a flange bearing used in the apparatus for transmitting rotational force of the surveillance camera of FIG. 4.

Referring to FIG. 4, the apparatus for transmitting rotational force of a surveillance camera according to an embodiment of the present invention is a motor-side pulley 110 that rotates by a driving force of a motor (not shown), and the rotation of the motor-side pulley 110 The timing belt 130 for transmitting power by connecting the camera-side pulley 120 rotated by the motor-side pulley 110 and the camera-side pulley 120, and the timing from the outside of the camera-side pulley 120 It includes an idler 140 that contacts the belt 130 and provides tension so that the timing belt 130 is in close contact with the camera-side pulley 120. By arranging the idler 140 outside the gear teeth 122 of the camera-side pulley 120 based on the concentric radius of the camera-side pulley 120, when the motor is driven and the timing belt 130 rotates, the timing belt ( The gear tooth 132 of 130) and the gear tooth 122 of the camera-side pulley 120 are brought into close contact, thereby minimizing the difference in the rotation angle of the camera compared to the rotation angle of the motor. Although only one idler 140 is shown in FIG. 4, it will be apparent to those skilled in the art that a plurality of idlers 140 may be formed outside the camera-side pulley 120 at predetermined intervals.

The motor-side pulley 110 is connected to the motor shaft and rotates as the motor rotates. The timing belt 130 is connected to the outside of the motor-side pulley 110, and the timing belt 130 moves according to the rotation of the motor-side pulley 110.

The camera-side pulley 120 is connected to the camera, and when the timing belt 130 moves, the gear teeth 122 of the camera-side pulley 120 connected to the gear teeth 132 of the timing belt 130 receive force and the camera Side pulley 120 rotates. That is, the camera-side pulley 120 is rotated by receiving the rotational force of the motor-side pulley 110 through the timing belt 130. At least one idler 140 is positioned on the outside at a portion where the gear teeth 122 of the camera-side pulley 120 and the gear teeth of the timing belt 130 meet.

The idler 140 is disposed at a portion where the gear teeth 122 of the camera-side pulley 120 and the gear teeth of the timing belt 130 meet to provide tension so that the timing belt 130 is in close contact with the camera-side pulley 120. . When the idler 14 contacts the timing belt from the outside of the camera-side pulley, tension can be transmitted in the entire circumferential direction of the camera-side pulley 120. In order to transmit a certain tension in the entire circumferential direction of the camera-side pulley 120, three or more idlers 140 are preferably arranged at predetermined intervals. In addition, the idler 140 is coated with a lubricant on the outer surface in contact with the timing belt 130 so that the idler 140 rotates smoothly. A flange bearing may be used as the idler 140, which will be described later.

5 is a view showing a cross section of a flange bearing used in the rotational force transmission device of the surveillance camera of FIG. 4.

Tension can be transmitted in the entire circumferential direction of the camera-side pulley 120 by using a plurality of flange bearings 145 arranged at predetermined intervals on the outside of the camera-side pulley 120.

5, the flange bearing 145 includes an inner ring 146 forming a hollow (h), a flange 147 disposed outside the inner ring 146, the inner ring 146, and It may include a plurality of balls 148 between the flanges 147.

A fastening member such as a bolt is inserted into the hollow (h) to mount the flange bearing 145 to the surveillance camera. The flange bearing 145 can be in good contact with the outside of the timing belt 130 by the flange 147, and the flange bearing 145 can be rotated by the plurality of balls 148. At this time, by applying a lubricant between the flange 147 in contact with the timing belt 130 and the outer side of the timing belt 130, it is possible to help smooth rotation of the flange bearing 145.

6 is a view showing the structure of a rotational force transmission device for a surveillance camera according to another embodiment of the present invention. In addition, FIG. 7 is a view showing a partial cross section of the rotational force transmission device of the surveillance camera of FIG. 6.

6 and 7, the apparatus for transmitting rotational force of a surveillance camera according to another embodiment of the present invention receives the rotational force of the motor-side pulley 110 through the timing belt 130 and rotates the camera-side pulley 120 ), an idler 140 that contacts the timing belt 130 to provide tension so that the timing belt 130 is in close contact with the camera side pulley is disposed, and the frame on which the idler 140 is mounted is mounted. It is characterized in that the long hole 150 is formed in the surface 50. The rotational force transmission device of the surveillance camera according to another embodiment of the present invention, except for the long hole 150, other configurations are the same as the rotational force transmission device of the surveillance camera according to the embodiment of the present invention described above, so that detailed description thereof is omitted. do.

The long hole 150 is formed on the mounting surface 50 of the frame on which the idler 140 is mounted, and is formed to determine the optimal number of the idler 140 to be mounted at a required position. The long hole 150 may include at least one boss 155 to which the idler 140 is mounted. That is, the fastening member 160 is used to fix the idler 140 to the mounting surface 50, and a boss 155 into which the fastening member 160 is inserted may be provided in the long hole 150. By using the boss 155, the idler 140 can be accurately mounted at an appropriate position.

As shown in FIG. 7, when the flange bearing 145 is used as the idler 140, the flange bearing 145 is fixed using the fastening member 160 when the installation position of the flange bearing 145 is determined. By the operation of the timing belt 130 and the camera side pulley 120 are accurately contacted. That is, the inner circle diameter of the gear teeth 132 of the timing belt 130 and the outer circle diameter of the gear teeth 122 of the pulley 120 on the camera side are accurately contacted, and the flange bearing in the circumferential direction in which the timing belt 130 rotates. 145 rotates smoothly. Accordingly, it is possible to minimize the angle difference due to contraction and expansion of the timing belt 130 and the pulley 120 due to external temperature changes, and is fitted within the gear teeth of the timing belt 130 and the camera side pulley 120 It is possible to prevent the occurrence of angle difference due to foreign matter.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features. You can understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

110: motor side pulley 120: camera side pulley
130: timing belt 140: idler
145: flange bearing 150: long hole

Claims (6)

A motor-side pulley that rotates by the driving force of the motor;
A camera-side pulley rotated by the rotation of the motor-side pulley;
A timing belt connecting the motor-side pulley and the camera-side pulley to transmit power;
A plurality of idlers contacting the timing belt from the outside of the camera-side pulley to provide tension so that the timing belt is in close contact with the camera-side pulley; And
Including a frame on which the plurality of idlers are mounted,
A long hole extending along the circumference of the camera-side pulley is formed on the mounting surface of the frame, and a plurality of idlers are respectively disposed at different positions within the long hole. The method of claim 1,
The plurality of idlers includes a plurality of flange bearings arranged at predetermined intervals on the outside of the camera-side pulley. The method of claim 2,
The flange bearing includes an inner ring forming a hollow, a flange disposed outside the inner ring, and a plurality of balls disposed between the inner ring and the flange. delete The method of claim 1,
The long hole includes at least one boss to which the idler is mounted, the rotational force transmission device of the surveillance camera. The method of claim 1,
The plurality of idlers, a lubricant is applied to the outer surface in contact with the timing belt, the rotational force transmission device of the surveillance camera.

Images