Patent ID: 11931850
Assignee: COSTA LEVIGATRICI S.P.A.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 9:
10. A sanding machine, comprising:
(a) a support and transport plane for forwarding workpieces to be processed;
(b) a frame which supports at least one belt sanding unit, wherein
(b-1) the sanding unit comprises an abrasive belt which extends, and during operation, rotates transversally, with respect to a feed direction of said support and transport plane,
(b-2) inside said abrasive belt is arranged a pressure pad which is arranged with an inclination with respect to the extent of said abrasive belt and which is suitable to press the belt against the workpiece to be processed; wherein said pressure pad is divided into a plurality of pressure elements which are actuated individually;

wherein said sanding machine further comprises:
(iii) a control beam comprising a series of sensors, at least one sensor for each pressure element of the pressure pad wherein said control beam is arranged parallel to said abrasive belt; and
(iv) a control unit adapted to control the operation of the single pressure elements on information received from the sensors compensates different distances between each sensor and a corresponding pressure element across a working width, and wherein
the compensation of different distances between each sensor and corresponding pressure element in the control unit takes place starting from one end of the control beam or of the pressure pad and considering consecutively the inclination angle (α) which is formed between a base line that starts in the pressure element closer to the control beam and extends parallel to an extent of the control beam and a line passing through centres of all the pressure elements while determining the distances between each sensor and said corresponding pressure element towards an other end of the control beam wherein a relative distance (yn) of the pressure element from a base line, with respect to which the pad is inclined with the angle (α), is calculated with the formula yn=f·n·sen α with f being the centre distance of the centres of the pressure elements and n being the number of the respective pressure element to be considered with respect to the pressure element closer to the control beam.