KR20110034491A

KR20110034491A - Apparatus for measuring shawl width of tread of tire

Info

Publication number: KR20110034491A
Application number: KR1020090092024A
Authority: KR
Inventors: 강신석
Original assignee: 주식회사 케이에스테크
Priority date: 2009-09-28
Filing date: 2009-09-28
Publication date: 2011-04-05

Abstract

PURPOSE: An apparatus for measuring the sole width of tread of a tire is provided to reduce failure rate due to the extrusion process of the tread by reduction in the error range of the width of the tread measured. CONSTITUTION: An apparatus for measuring the sole width of tread of a tire comprises first and second lighting devices(16a,16b), a servo motor(25), a driving controller(30), and an image processing module(40). The first and second lighting devices are placed on both sides of a tread(14) transferred by a conveyer belt(12). The first and second lighting devices lights the side of the tread. The sub-motor is placed in the upper space of the conveyer belt vertically to the transfer direction of the tread. The driving controller controls the operation of the first and second cameras(20a,20b). The image processing module receives and processes image signals from the first and second cameras.

Description

Shawl width measuring device of tire tread {Apparatus for measuring shawl width of tread of tire}

The present invention relates to a device for measuring the shoulder width (shoulder width) of the tread, a semi-finished product of the tire, and more specifically, by measuring the shawl width of the tread, a semi-finished product of the tire more accurately in real time during its manufacturing process, It relates to a tread shawl width measuring device to be significantly lowered.

When producing tires for use in vehicles such as vehicles, treads, which are in the form of their semifinished products, are produced via an extrusion process. Such a tread portion forms a rubber layer having a unique pattern as a portion in direct contact with the road surface after the forming process and the vulcanization process. As used herein, the term "tread" in the "tread as a tire semi-finished product" refers to the side where the tire is in contact with the road surface, and should be understood as meaning the tire tread that has undergone the extrusion process before the tire is completed as a whole.

This tread is passed through the extrusion process to the next process by the conveyor belt. During the transfer by the conveyor belt, the shawl width (W) of the tread as shown in FIG. 3 is measured to check for defects caused by extrusion, thereby lowering the defect rate by adjusting extrusion conditions such as extrusion speed and extrusion temperature.

Conventionally, the shoulder width of such a tread was measured manually by manpower, and recently, it was measured using a vision system as shown in FIG. Such a tread shoulder width measuring device illuminates the light toward the side of the tread 102 at both sides of the tread 102 when the tread 102 after the extrusion process is conveyed by the conveyor belt 101 as shown in FIG. 4. A lighting unit 104, a camera 103 for photographing the reflection and transmission of the light irradiated by the lighting unit 104, and a data processing unit (not shown) for processing data from the camera 103.

More recently, Korean Patent Application Publication No. 10-2005-0094211 (published on September 27, 2005), in which the applicant is Hankook Tire Co., Ltd. and entitled "Tire Width Measuring Device of Tire Tread", discloses an illumination unit for illuminating both sides of the tread 102. A tread shawl width measuring device is disclosed in which 104 is advanced back and forth by a feed screw 108 guided by each feed motor 106 and a guide bar 7 installed on a base 105 (FIG. 5). Reference). Reference numeral 101 denotes a conveying conveyor belt, 103 a camera, and 109 a mounting bracket 109.

In the conventional tread shoulder width measuring apparatus, when the light irradiated from the lighting unit 104 is reflected on the inclined surface of the tread 102, a light amount distortion occurs and precise measurement of the shoulder width is still a problem. On the contrary, to reduce the amount of light distortion, a high resolution camera and ancillary means for correcting the same are required. The use of high resolution cameras raises the price of the tread shoulder width measurement equipment, and the correction means has to be checked every time by human personnel to ensure its accuracy. To reduce the error range of measurement at low cost, new equipment with reliable reliability is required.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is that the shoulder width of the tread is less than 0.02mm without distortion of the light amount when the light emitted from the lighting unit is reflected on the inclined surface of the tread An object of the present invention is to provide a tread shoulder width measuring device for precisely measuring an error range.

In order to achieve the above object,

A pair of first and second lighting devices respectively disposed on both sides of the tread carried from the conveyor belt to illuminate the side of the tread;

A ball screw disposed vertically with respect to the conveying direction of the tread in the upper space of the conveyor belt, and the thread arrangements are arranged in opposite directions from both longitudinal centers thereof to opposite sides according to a rotational motion of the ball screw; A servomotor which mechanically adjusts rotational movements of the pair of first and second cameras and the ball screw which are coupled to move in a direction so that the first and second cameras are moved in opposite directions from the ball screw; And

A driving controller for controlling driving of the first and second cameras; And

Provided is a tread shoulder width measuring apparatus including an image processor for receiving and processing image signals from the first and second cameras. Such a shoulder width measuring device of the tread according to the present invention is interlocked with the first lighting device and the first camera generally perpendicular to each other, and the second lighting device and the second camera also interlocking together in a substantially perpendicular state, and driven Since the manipulation is precisely performed by the control unit and the servomotor, the shoulder width measurement error can be significantly reduced, that is, less than 0.02 mm.

The shoulder width measuring apparatus of the tread according to the preferred embodiment of the present invention further includes a third lighting device disposed on the rear surface of the tread for illuminating the tread from the bottom to the top. This third lighting device allows the first and second cameras to more clearly detect the full width of the tread, thereby further reducing the tread shoulder width measurement error.

In a preferred embodiment of the present invention, the first and second lighting devices are arranged at an angle to allow reflection on the inclined surface of the tread and pass on the upper surface of the tread, respectively.

In a preferred embodiment of the present invention, the first and second cameras each have a boundary point that is reflected and transmitted by the illumination of the first and second lighting devices to the tread, the lens of the first and second cameras. It is controlled to be centrally located.

According to the present invention, the shoulder width measuring apparatus of the tread has an edge portion that is a boundary point between the inclined surface and the upper surface of the tread while interlocking with the first and second cameras in a substantially perpendicular state with the first and second lighting devices, respectively. By measuring the width of the tread with the help of a third lighting device that is precisely measured and illuminated from the bottom of the tread upwards, it is possible to significantly reduce the error range of the measured tread shawl width. It is possible to reduce significantly.

The invention is now described with reference to the accompanying illustrative drawings.

Figure 1 schematically shows the apparatus for measuring the shoulder width of the tread according to a preferred embodiment of the present invention, Figure 2 shows the operating relationship of the tread shoulder width measuring apparatus according to the present invention and the picture actually taken by the camera and displayed as an image It is shown schematically.

Referring to FIG. 1 together with FIG. 2, a shoulder width measuring apparatus of a tread according to the present invention includes a pair of first and second lighting devices 16a and 16b for illuminating both sides of the tread 14 and the first. And first and second cameras 20a and 20b for photographing the shoulder width W of the tread 14 according to the illumination of the second lighting devices 16a and 16b, respectively the first and second. A driving controller 30 for controlling the driving of the cameras 20a and 20b and an image processor 40 for receiving and processing the captured image signals from the first and second cameras 20a and 20b. Include.

A pair of first and second lighting devices 16a and 16b are respectively disposed on both sides of the tread 14 carried from the conveyor belt 12 to illuminate both sides of the tread 14. In this case, when the light from the first and second lighting devices 16a and 16b reaches the inclined surface S of the tread 14, a normal to the inclined surface S (not shown but perpendicular to the inclined surface). Should be assumed to be reflected at the same angle of incidence as the angle of incidence. On the other hand, the light from the first and second lighting devices (16a, 16b) passes through the upper surface of the tread 14, that is, the shoulder width (W) without any obstacle. That is, the inclined surface S of the tread 14 will be clearly identified depending on the amount of light illuminated by its reflected light, and the top surface of the tread 14 will be darkly identified due to its transmission.

In the upper space of the conveyor belt 12 to photograph a portion irradiated from the first and second lighting devices 16a and 16b and reflected by the tread 14 and relatively unreflected. The first and second cameras 20a and 20b are installed.

The first and second cameras 20a and 20b are arranged perpendicular to the conveying direction of the tread 14 with the aid of a ball screw 24 as shown. The ball screws 24 are arranged in opposite directions from each other in the thread arrangement from the center to both sides. Due to this mutually opposite orientation, the first camera 20a and the second camera 20b may be closer to each other or farther from each other by the rotational motion of the ball screw 24. The rotation of the ball screw 24 is actuated by the servomotor 25 as shown.

The rotation operation of the servomotor 25 is controlled by the drive controller 30, and the drive controller 30 is a portion photographed by the first and second cameras 20a and 20b, that is, the tread 14. The upper surface and the inclined surface (S) meets the role of vertical shooting. With the adjustment of the first and second illumination devices 16a and 16b described above, the shawl width measurement of the tread 14 is more precise according to the operation of each of the first and second cameras 20a and 20b. To lose.

The invention also includes a third lighting device 18 arranged on the back of the tread 14 to illuminate the tread 14 from bottom to top. The third lighting device 18 is installed to illuminate both the bottom width, i.e., the full width, on the drawing of the tread 14 so that the first and second cameras 20a, 20b further expand the full width of the tread 14. Be sure to shoot clearly. Those of ordinary skill in the art, who are fully familiar with the present specification, properly adjust the amount of light of each lighting device in consideration of the above-described concepts and arrangement conditions so that the first and second cameras 20a and 20b further increase the shoulder width of the tread 14. It will be possible to clearly capture and recognize.

In particular, FIG. 2 shows a picture taken by each of the first and second cameras 20a and 20b under illumination conditions by the respective first and second illumination devices 16a and 16b.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It can be understood that it is possible.

1 is a schematic perspective view of a tread shoulder width measuring apparatus according to the present invention.

2 is a block diagram showing the principle of the present invention.

3 shows the tread and its shoulder width (W).

4 is a conventional diagram for measuring the shoulder width W of the tread.

5 is another conventional view for measuring the shoulder width W of the tread.

12: conveyor belt 14: tread

16 lighting device (16a: first lighting device; 16b: second lighting device)

17: lighting device width adjuster 18: third lighting device

20: camera (20a: first camera; 20b: second camera)

24: Ball screw 25: Servo motor

30: driving control unit 40: image processing unit

Claims

A pair of first and second lighting devices (16a) (16b) disposed on both sides of the tread (14) conveyed from the conveyor belt (12) to illuminate the side of the tread (14);

A ball screw 24 disposed vertically with respect to the conveying direction of the tread 14 in the upper space of the conveyor belt 12, the thread arrangement of which is arranged in opposite directions from each other from its longitudinal center portion to both sides thereof; According to the rotational motion of the ball screw 24, the pair of first and second cameras 20a and 20b and the ball screw 24, which are coupled to be moved in opposite directions to each other, are mechanically adjusted to A servo motor 25 for allowing the first and second cameras 20a and 20b to move in opposite directions from the ball screw 24; And

A driving controller 30 for controlling driving of the first and second cameras 20a and 20b; And

An image processor 40 for receiving and processing image signals from the first and second cameras 20a and 20b;

Shawl width measuring device of the tread comprising a.

The apparatus of claim 1, further comprising a third lighting device (18) disposed on the rear surface of said tread (14) for illuminating said tread (14) from bottom to top.

The method of claim 1 or 2, wherein the first and second lighting devices (16a, 16b) are respectively reflected to the inclined surface (S) of the tread (14) and with respect to the upper surface of the tread (14). The shoulder width measuring device of the tread, characterized in that arranged at an angle to pass.

4. The boundary of claim 3, wherein the first and second cameras 20a and 20b are respectively reflected and transmitted by illumination of the first and second illumination devices 16a and 16b to the tread 14, respectively. The shoulder width measuring device of the tread, characterized in that the point is controlled to be located in the center of the lens of the first and second cameras (20a, 20b).

5. The tread shawl width measuring device according to claim 4, wherein the boundary point is an edge where an upper surface of the tread and an inclined surface S meet.

The apparatus of claim 1 or 2, characterized in that the distance between the first and second cameras (20a) (20b) and the tread (14) is adjusted as a function of the amount of light.

The distance between the first and second lighting devices (16a) (16b) and the tread (14) is received by the first and second cameras (20a) (20b). Tread shoulder width measurement device, characterized in that the function is adjusted according to the video signal.