Method and Device for Holding Sheet Metal Strips, and Angular Scissors

Abstract

The aim of the invention is to temporarily retain sheet metal strips ( 21 - 24 ) which are cut from a metal plate by a roller cutting device ( 2 ). Said aim is achieved by using a holding device that magnetically and/or pneumatically grips the top face of the sheet metal strips, preferably in scissor shears, resulting in a substantially reduced adjusting effort and mechanical effort in comparison to previously used torsion bars.

1 . A method for the holding of sheet metal strips ( 21 - 24 ) which are output simultaneously from a cutting device ( 2 ), with the strips being held essentially in their relative output positions and then being allowed to fall onto a conveyor device ( 14 ), characterized in that the sheet metal strips are held at their upper side, and in particular only at their upper faces, magnetically and/or by suction.  
   
   
       2 . A method according to  claim 1 , further characterized in that the sheet metal strips are held by way of electromagnetism and/or permanent magnetism.  
   
   
       3 . A method according to  claim 1 , further characterized in that the sheet metal strips are allowed to drop by deactivating the electrically created magnetic field, by mechanical operation on the sheet metal strips to overcome the permanent magnetic field, or by deactivation of the suction.  
   
   
       4 . A method according to  claim 1 , further characterized in that the holding is accomplished by way of magnetic rollers ( 6 - 9 ) along which the associated sheet metal strips move upon their output from the cutting device.  
   
   
       5 . A method according to  claim 1 , further characterized in that the holding is accomplished by magnetic rails ( 30 ) on which the associated sheet metals strips slide during their output from the cutting device.  
   
   
       6 . A method according to  claim 5 , further characterized in that the rails are provided with coatings which reduce the friction of the strips on the rails.  
   
   
       7 . A method according to  claim 1 , further characterized in that the holding is accomplished by means of at least one surface ( 38 ) provided with suction openings of ( 37 ), which suction openings are connected with a sub-atmospheric pressure source ( 31 ).  
   
   
       8 . A method according to  claim 7 , further characterized in that the surface at least sectionwise is provided with a coating which reduces the sliding friction between a sheet metal strip and the surface.  
   
   
       9 . A holding device ( 10 ,  10 ′,  10 ″), for a sheet metal shears, which holding device is provided at the output of a cutting device ( 2 ) for the holding of several sheet metal strips ( 21 - 24 ) output simultaneously from the cutting device to hold those strips essentially in their relative output positions and to thereafter release the sheet metal strips by allowing them to drop, characterized in that the holding device ( 10 ,  10 ′,  10 ″) includes a holding means ( 5 - 10 ;  11 ,  30 ,  35 ;  31 ,  36 ,  37 ,  38 ) which fixedly holds the sheet metal strips at their upper faces, and in particular, only at their upper faces, magnetically and/or pneumatically.  
   
   
       10 . A holding device according to  claim 9 , further characterized in that the sheet metal strips are held electromagnetically and/or permanent magnetically.  
   
   
       11 . A holding device according to  claim 9 , further characterized in that the sheet metal strips are allowed to drop by deactivation of the electrically created magnetic field, by mechanical operation on the sheet metal strips to overcome the permanent magnetic field, or by deactivation of the suction pressure.  
   
   
       12 . A holding device according to  claim 9 , further characterized in that the holding takes place by magnetic rolls of ( 6 - 9 ), along which an associated sheet metal strip moves during its output from the cutting device.  
   
   
       13 . A holding device according to  claim 9 , further characterized in that the holding is accomplished by magnetic rails ( 30 ) on which the associated sheet metal strips slide during their output from the cutting device.  
   
   
       14 . A holding device according to  claim 13 , further characterized in that the rails are provided with a coating which reduces the friction between the sheet metal strips and the rail.  
   
   
       15 . A holding device according to  claim 9 , further characterized in that for the holding by means of suction at least one surface ( 38 ) with suction openings ( 37 ) is provided, which openings are connected with a sub-atmospheric pressure source ( 31 ).  
   
   
       16 . A holding device according to  claim 15 , further characterized in that the surface ( 38 ) at least sectionwise is provided with a coating reducing the friction between the sheet metal strips and the surface.  
   
   
       17 . Scissor shears ( 1 ) with a first cutting device ( 2 ) and a second cutting device ( 3 ) and with a holding device ( 10 ;  10 ′;  10 ″) according to  claim 9  arranged between the two cutting devices, which holding device delivers the sheet metal strips ( 21 - 24 ) cut by the first cutting device ( 2 ) to a conveyor device which delivers the sheet metal strips to the second cutting device ( 3 ).