Abrading group

Abstract

An abrading group comprises a plurality of abrading units rotationally mounted on a crossbar extending along a transverse direction that is transverse with respect to an intended advance direction of pieces to be abraded, a driving arrangement for rotating each abrading unit around a longitudinal axis thereof, a further driving arrangement for oscillating said crossbar along said transverse direction, said further driving arrangement is such as to oscillate said crossbar also along said advance direction.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a new U.S. utility application claiming benefit of IT M02005A000254 filed Oct. 6, 2005, the entire contents of which are hereby incorporated by reference. [0002] The invention relates to an abrading group that is associable with a machine tool, for example a sanding machine arranged for processing wood or comparable materials and a driving method for driving the aforesaid abrading group. [0003] In particular, the invention relates to an abrading group provided with abrading tools arranged for finishing and sanding corner zones of a piece to be processed, for example a panel. BACKGROUND OF THE INVENTION [0004] Abrading groups are known comprising an endless conveying belt that is positioned transversely to and above a conveyor belt arranged for conveying a piece to be processed. The conveying belt moves along a loop path that is substantially transverse to an advance direction of the conveyor belt and comprises a plura...

AI Technical Summary

Benefits of technology

[0028] A further object is to obtain an abrading group that improves the surface quality of the piece to be processed.

[0029] A still further object is to obtain abrading groups that are simple to make a

Problems solved by technology

A drawback that besets the aforesaid known abrading groups is that they do not allow uniform finishing of the surface to be sanded.

In fact, the abrading groups provided with abrading brushes do not allow suitable sanding of corner zones that are substantially transverse with respect to the advance direction of the piece, on the other hand, the abrading groups comprising rotating cylinders do not allow suitable abrading of corner zones that are substantially parallel to the advance direction of the piece.

It is clear that this, in addition to involving a financial burden, involves difficulties in designing the layout of the system.

A drawback that besets the aforesaid known abrading groups is the discontinuity of the working conditions of the abrading tools at the motion reversal points.

Therefore, it occurs that a portion of the surface of the piece, which portion has been abraded in this interval, has a surface quality that is inferior to a further portion that has been abraded during normal movement of the frame.

A further drawback of the aforesaid known abrading groups is the necessity of using two distinct sources of energy: electric energy for rotating the rotating discs and compressed air for moving the movable crossbar.

In addition to increasing expense, this also entails constructional difficulties inasmuch for using compressed air it is necessary to provide for and install complex pneumatic cabling.

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