Grinding Head

Abstract

Grinding heads rotate about central axes, have surfaces between plane and cylindrical surfaces provided with retainer grooves for edge profile parts of a number of abrasive paper members with associated support brushes. Abrasive paper members are mounted at angles of 20-40°, preferably about 30°, directed obliquely forward in the direction of rotation of the plane surface and a tangential plane of the cylindrical surface. Retainer grooves for edge profile parts of the abrasive paper members extend obliquely rearward in the direction of rotation of the plane surface at an angle of 3-10° relative to a radial extension. Alternatively, the retainer grooves extend obliquely rearward in the direction of rotation of the cylindrical surface at an angle of 3-10° relative to an axially parallel generatrix of the cylindrical surface. In a simple way a more optimal abrading of particularly outer side edges and edge areas of plate-shaped items is readily achieved.

1 . Grinding head ( 1 ′) adapted to rotate about a central axis, comprising a surface which is selected between a plane surface ( 2 ′) and a cylindrical surface ( 13 ), and which is provided with retainer grooves ( 12 ) for edge profile parts ( 14 ) of a number of abrasive paper members ( 3 ) with associated support brushes ( 4 ), wherein the abrasive paper members ( 3 ) are mounted at an angle of 20-40°, preferably about 30°, directed obliquely forward in the direction of rotation of the plane surface ( 2 ′) and the tangential plane of the cylindrical surface ( 13 ), respectively. 
     
     
         2 . Grinding head ( 1 ′) according to  claim 1 , wherein the retainer grooves ( 12 ) for the edge profile parts ( 14 ) of the abrasive paper members ( 3 ) extend obliquely rearwards in the direction of rotation of the plane surface ( 2 ′) at an angle ( 8 ) of 3-10° relative to a radial extension. 
     
     
         3 . Grinding head ( 1 ′) according to  claim 1 , wherein the retainer grooves ( 12 ) of the edge profile parts ( 14 ) of the abrasive paper members ( 3 ) extend obliquely rearwards in the direction of rotation of the cylindrical surface ( 13 ) at an angle ( 3 ) of about 3-10° relative to an axially parallel generatrix of the cylindrical surface ( 13 ). 
     
     
         4 . Grinding head ( 1 ″) according to  claim 1 , wherein the plane surface ( 2 ′) between the retainer grooves ( 12 ) for the edge profile parts ( 14 ) of the abrasive paper members ( 3 ) is designed with radial suction apertures ( 15 ), and that the grinding head ( 1 ″) includes an enclosing housing ( 16 ) which is provided along its periphery with an annular lip seal ( 17 ). 
     
     
         5 . Grinding head ( 1 ″) according to  claim 4 , wherein the lip seal ( 17 ) is constituted by brushes made of an electrically conducting material, e.g. carbon fibre brushes ( 18 ). 
     
     
         6 . Grinding head ( 1 ″) according to  claim 4 , wherein side edges ( 19 ) of the radial suction apertures ( 15 ) have an inclined course downwards in the direction of rotation such that rotation of the plane surface ( 2 ′) can cause a sucking effect by itself. 
     
     
         7 . Grinding head ( 1 ′,  1 ″) according to  claim 1 , wherein the support brushes ( 4 ) comprise relatively soft brushes of pig bristles. 
     
     
         8 . Grinding head ( 1 ′,  1 ″) according to  claim 1 , wherein the support brushes ( 4 ) comprise soft horsehair brushes. 
     
     
         9 . Grinding head ( 1 ′,  1 ″) according to  claim 1 , wherein the support brushes ( 4 ) comprise relatively stiff brushes of Tampico fibres. 
     
     
         10 . Grinding head ( 1 ′,  1 ″) according to  claim 1 , wherein the support brushes ( 4 ) consist of a mixture of pig bristles, horsehair and Tampico fibres.