CLAIMS

1. A system which allows controlling bending radius instantly in cylindrical bending machines (10)

- comprising an upper roller (11 and at least one left lower roller (12) and at least one right lower roller (13) which are located in symmetrical or asymmetrical manner with respect to said upper roller (11), and

- enabling piece (20) passed between said rollers (11 , 12, 13) to be bent at a certain radius,

and the system characterized in comprising;

- a left distance sensor (30) and a right distance sensor (40) which are located in both sides of the upper roller (11) in a symmetrical or asymmetrical manner, the distance between which can be changed, and which determine the coordinates ((x1 ,y1),(x2,y2)) of two points (A, B) on the piece (20) instantly, and

- a control device (50) having an algorithm which determines the coordinate (x3,y3) of a third point (C) on the piece (20) using the coordinate information ((x1,y1),(x2,y2)) coming from said distance sensors (30, 40) and upper roller circle (C1) radius value (R) and which calculates the instant bending radius of the piece (20) with the algorithm of the circle passing over the three points.

2. The instant bending radius control system according to Claim 1 , characterized in that said sensors (30, 40) are laser distance sensors.

3. The instant bending radius control system according to Claim 1 , characterized in that said control device (50) comprises a screen on which the calculated instant bending radius values are shared with the operator.

4. The instant bending radius control system according to Claim 1 , characterized in that the control device (50) comprises a hydraulic drive system powered by a servo motor serving to automatically control the movements of the lower rollers (12, 13) in line with the calculated instant bending radius.

5. The instant bending radius control system according to Claim 1, characterized in comprising a distance sensor used for determining the coordinate of a third point on the piece (20) whose bending is completed, in addition to the right and left distance sensors (30, 40).

6. A method which allows controlling bending radius instantly in cylindrical bending machines (10) comprising an upper roller (11) and at least one left lower roller (12) and at least one right lower roller (13) which are located in symmetrical or asymmetrical manner with respect to said upper roller (11) and enabling a piece (20) passed between said rollers (11, 12, 13) to be bent at a certain radius, characterized in comprising the process steps of;

- reading of the coordinate (x1 ,y1) of a point (A) on the piece (20) by means of a distance sensor (30) disposed in the left hand side of the upper roller (11),

- reading of the coordinate (x2,y2) of another point (B) on the piece (20) by means of a distance sensor (40) disposed in the right hand side of the upper roller (11),

- transferring of the read coordinate values ((x1 ,y1),(x2,y2)) to a control device (50) having an algorithm calculating the instant radius value,

- determining of the coordinate (x3, y3) of a third point (C) on the piece (20) by means of the control device (50) using coordinate information ((x1,y1), (x2,y2)) and upper roller circle (C1) radius value (R) by way of said algorithm, and

- determining of the instant bending radius of the piece (20) using the determined coordinate information ((x1,y1), (x2,y2), (x3,y3)) by means of the algorithm of the circle passing over three points.

7. The instant bending radius measurement method according to Claim 6, characterized in that the control device (50) algorithm performs the following process steps in order to determine the coordinates ((x3,y3)) of a third point (C) on the piece (20);

- reading the radius value (R) of the upper roller circle (C1),

- receiving coordinates ((x1 ,y1), (x2,y2)) from distance sensors (30, 40), - forming a circle (C2) passing over the center of the upper roller circle (C1) and over points A, B ((x1 ,y1), (x2,y2)) with the algorithm of the circle passing over three points,

- finding the junction points (K1 , K2) of the formed circle (C2) and the upper roller circle (C1),

- defining the radical axis (L1) passing over the junction points (K1 , K2),

- defining the axis (L2) passing over points A and B,

- finding the junction points (N) of said axes (L1 , L2),

- drawing a tangent line to the area of the upper roller (11) contacting with the piece (20) from the found junction point (N) and calculating the coordinates (x3, y3) of the tangent point (C).

8. The instant bending radius measurement method according to Claim β, characterized in that the instant bending radius is shared by means of the control device (50) screen.

9. The instant bending radius measurement method according to Claim 6, characterized in that the control device (50) controls the movements of the rollers (11, 12, 13) in line with the instant bending radius values calculated by means of the servo motor powered hydraulic drive system, thereby enabling the pieces (20) to be bent in the desired radius.