Grinding or sanding machine

Abstract

A grinding or sanding machine for grinding or sanding a surface of a workpiece includes a transportation device for transporting a work piece, a revolving grinding or sanding belt, and at least one pressure beam for exerting a pressure toward the transportation device. A plate is provided that is movable in a plane perpendicular to the direction in which pressure is exerted. The plate is disposed between the belt and the pressure beam. A drive device randomly moves the plate in plate movement directions in terms of either or both direction and speed.

Claims

1. Grinding or sanding machine for grinding or sanding a surface of a workpiece, comprising: at least one transportation device for transporting the workpiece in a transportation direction; at least one revolving grinding or sanding belt; at least one pressure beam for exerting a pressure in a direction towards the transportation device on the grinding or sanding belt; a plate mounted so as to be movable in a plane that is perpendicular to the direction in which the at least one pressure beam exerts pressure, wherein the plate is disposed between the grinding or sanding belt and the at least one pressure beam, and wherein the plate is moveable in moving directions which are different from the transportation direction of the at least one transportation device, and at least one drive device which is configured for moving the plate randomly in the moving directions in terms of either or both direction and speed.

2. The grinding or sanding machine according to claim 1, wherein the plate has at least one surface with a structure.

3. The grinding or sanding machine according to claim 2, wherein the structure has a plurality of depressions and/or elevations.

4. The grinding or sanding machine of claim 3 wherein the plurality of depressions and/or elevations on the surface are disposed in a uniform manner.

5. The grinding or sanding machine according to claim 1, wherein the at least one drive device moves the plate in moving directions in a non-cyclic or non-repetitive manner.

6. The grinding or sanding machine according to claim 1 wherein the at least one drive device is configured for moving the plate in an oscillating manner.

7. The grinding or sanding machine according to claim 1 wherein the at least one drive device is configured for moving the plate in a direction that is perpendicular to the transportation direction.

8. The grinding or sanding machine according to claim 1 wherein the plate is metal.

9. The grinding or sanding machine according to claim 8 wherein the metal is steel.

10. The grinding or sanding machine according to claim 1 wherein the at least one pressure beam has a plurality of pressure shoes which are disposed beside one another.

11. The grinding or sanding machine according to claim 10 wherein the plurality of pressure shoes are configured to permit a pressure of differing intensity to be exerted at different regions of the plate.

Description

(1) An exemplary embodiment of the present invention will be explained in more detail hereunder with the aid of the two drawings in which:

(2) FIG. 1shows the schematic illustration of part of a grinding or sanding machine according to a first exemplary embodiment of the present invention; and

(3) FIG. 2shows the schematic plan view of the device according to FIG. 1.

(4) FIG. 1 shows the fragment of a grinding or sanding machine according to a first exemplary embodiment of the present invention. Said grinding or sanding machine has a grinding or sanding belt 2 which in the present case is guided over a drive roller 4 and two deflection rollers 6. The deflection rollers 6 in the exemplary embodiment shown are disposed below the drive shaft 4. Of course, any other of the rollers shown can also be the drive roller 4 by way of which the grinding or sanding belt 2 is driven. The workpiece 8 to be machined is shown in FIG. 1, said workpiece 8 moving on a transportation device in the transportation direction that is represented by the arrow 10. Said workpiece 8 herein comes into contact with the grinding or sanding belt 2.

(5) The device shown in FIG. 1 has a pressure beam 12 which like all other components too, if obscured by another component, is illustrated by dashed lines. It can be seen that the pressure beam 12 in the exemplary embodiment shown extends across the entire width of the grinding or sanding belt 2. A plate 14 which is movable along the directions represented by the double arrow 16 is located between the grinding or sanding belt 2 and the pressure beam 12. The plate 14 in the exemplary embodiment shown can consequently only carry out an oscillating movement in a direction that is transverse to the transportation direction.

(6) The plate 14 has a plurality of elevations 18 which are preferably disposed on the surface of the plate 14 that faces the grinding or sanding belt 2.

(7) The device shown in FIG. 1 is shown in a schematic plan view in FIG. 2, wherein components which by virtue of other components are actually not visible are also illustrated.

(8) The elevations 18 of the plate 14 which again is movable along the direction represented by the double arrow 16 can be seen. The grinding or sanding belt 2 comes into contact with the workpiece 8 which is movable along the transportation direction that is represented by the arrow 10.

LIST OF REFERENCE SIGNS

(9) 2 Grinding or sanding belt 4 Drive roller 6 Deflection roller 8 Workpiece 10 Arrow 12 Pressure beam 14 Plate 16 Double arrow 18 Elevation