Device for separation and feeding of sheets of a recording carrier

Abstract

For separation and feeding of sheets of the recording carrier, these sheets are supplied stacked in a cassette. An advance head ( 18 ) sits on the stack with advance rollers ( 20 ), which is mounted on the free end of a pivotable arm ( 22 ). In order to be able to insert the cassette accommodating the stack and remove it, a release mechanism is provided that is operated by the cassette. For this purpose, the arm ( 22 ) is mounted on a slide ( 28 ) that is pulled into a release position by tension springs ( 32 ). A pusher ( 44 ) is also provided on the slide ( 28 ) that raises the arm ( 22 ) under spring force. With the cassette, an operating pin ( 58 ) is inserted into the release mechanism. The pin ( 58 ) pushes the slide ( 28 ) against the force of spring ( 32 ), into the operating position of arm ( 22 ) and pushes the pusher ( 44 ) into a position that releases the arm ( 22 ) for lowering onto the stack.

1 . A device for separation and feeding of sheets of a recording carrier, with a cassette insertable into a receiving space, which receives the sheets in an essentially horizontal stack and has a rising slope, on which the stack lies with its edge facing the free direction, with an arm mounted to pivot on an inside wall of the receiving space and protruding above the stack of the inserted cassette, with an advance head arranged on the free end of the arm, which can be lowered onto the stack by pivoting of the arm and raised from the stack, with at least one advance roller mounted in the advance head, which sits on the uppermost sheet of the stack when the advance head is lowered and can be driven, in order to push the uppermost sheet up for separation on the slope, and with a release mechanism that raises the arm from the stack when the cassette is moved from the receiving space, and which is operated by the cassette inserted into the receiving space, in order to release the arm for lowering onto the stack, wherein 
 the arm is mounted to pivot on a slide that is arranged movable on the inside wall essentially parallel to the surface of the stack, and is moved away from the slope by a spring force, a pusher is arranged moveable on a slide, which engages on the arm and is biased by a spring force in a position that raises the arm, and wherein at least one operating protrusion arranged in a cassette acts on the slide during insertion of the cassette and moves it against the spring force against the slope and acts on the slide and moves it against the spring force into the position that releases the arm.    
   
   
       2 . A device according to  claim 1 , wherein the operating protrusion is formed as a pin protruding from a cassette in the insertion direction, which acts on the slide and pusher via wedge surfaces.  
   
   
       3 . A device according to  claim 2 , wherein the slide has a passage opening for the pin, and a wedge surface is formed in the passage opening, which the pin encounters during insertion into passage opening, in order to move the slide against the spring force.  
   
   
       4 . A device according to  claim 2 , wherein the pin has a conical tip that penetrates the operating opening and produces the wedge effect for movement of the pusher.  
   
   
       5 . A device according to  claim 4 , wherein the operating opening is formed in a thrust plate mounted to move on the slide, and which can be made to cover the passage opening of the slide, and wherein the thrust plate is connected to the pusher via a pivotable lever.  
   
   
       6 . A device according to  claim 5 , wherein the lever is designed as a two-arm lever and converts the pushing path of the thrust plate to a larger pushing path of the pusher.  
   
   
       7 . A device according to  claim 1 , wherein the arm, together with a parallel rod, forms a parallel guide for the advance head, the parallel rod is lengthened beyond its bearing on the slide, and wherein the pusher engages on this lengthened end of the parallel rod.  
   
   
       8 . A device according to  claim 7 , wherein the lengthened end passes through an elongated hole of the pusher, is freely movable in this elongated hole in the release position and is entrained by the end of the elongated hole when the pusher is moved into the position that raises the arm under the spring force.  
   
   
       9 . A device for separation and feeding of sheets of a recording carrier, comprising: 
 a cassette insertable into a receiving space, which receives the sheets in an essentially horizontal stack and has a rising slope, on which the stack lies with its edge facing the free direction,    an arm mounted to pivot on an inside wall of the receiving space and protruding above the stack of the inserted cassette, arranged movable on the inside wall essentially parallel to the surface of stack, and is moved away from the slope by a spring force    a pusher arranged moveable on a slide, which engages on the arm and is biased by a spring force in a position that raises the arm,    an advance head arranged on the free end of the arm, which can be lowered onto the stack by pivoting of the arm and raised from the stack,    at least one advance roller mounted in the advance head, which sits on the uppermost sheet of the stack when the advance head is lowered and can be driven, in order to push the uppermost sheet up for separation on the slope, and    a release mechanism that raises the arm from the stack when the cassette is moved from the receiving space, and which is operated by the cassette inserted into the receiving space, in order to release the arm for lowering onto the stack, and    at least one operating protrusion arranged in a cassette that acts on the slide during insertion of the cassette and moves it against the spring force against the slope and acts on the slide and moves it against the spring force into the position that releases the arm.    
   
   
       10 . A device according to  claim 9 , wherein the operating protrusion is formed as a pin protruding from a cassette in the insertion direction, which acts on the slide and pusher via wedge surfaces.  
   
   
       11 . A device according to  claim 10 , wherein the slide has a passage opening for the pin, and wherein a wedge surface is formed in the passage opening, which the pin encounters during insertion into passage opening, in order to move the slide against the spring force.  
   
   
       12 . A device according to  claim 10 , wherein the pin has a conical tip that penetrates the operating opening and produces the wedge effect for movement of the pusher.  
   
   
       13 . A device according to  claim 12 , wherein the operating opening is formed in a thrust plate mounted to move on the slide, and which can be made to cover the passage opening of the slide, and wherein the thrust plate is connected to the pusher via a pivotable lever.  
   
   
       14 . A device according to  claim 13 , wherein the lever is designed as a two-arm lever and converts the pushing path of the thrust plate to a larger pushing path of the pusher.  
   
   
       15 . A device according to  claim 9 , wherein the arm, together with a parallel rod, forms a parallel guide for the advance head, the parallel rod is lengthened beyond its bearing on the slide, and wherein the pusher engages on this lengthened end of the parallel rod.  
   
   
       16 . A device according to  claim 15 , wherein the lengthened end passes through an elongated hole of the pusher, is freely movable in this elongated hole in the release position and is entrained by the end of the elongated hole when the pusher is moved into the position that raises the arm under the spring force.  
   
   
       17 . A method for separation and feeding of sheets of a recording carrier, comprising the steps of: 
 providing a cassette insertable into a receiving space, which receives the sheets in an essentially horizontal stack and has a rising slope, on which the stack lies with its edge facing the free direction,    providing an arm mounted to pivot on an inside wall of the receiving space and protruding above the stack of the inserted cassette, arranged movable on the inside wall essentially parallel to the surface of stack, and is moved away from the slope by a spring force    providing a pusher arranged moveable on a slide, which engages on the arm and is biased by a spring force in a position that raises the arm,    providing an advance head arranged on the free end of the arm, which can be lowered onto the stack by pivoting of the arm and raised from the stack,    providing at least one advance roller mounted in the advance head, which sits on the uppermost sheet of the stack when the advance head is lowered and can be driven, in order to push the uppermost sheet up for separation on the slope, and    providing a release mechanism that raises the arm from the stack when the cassette is moved from the receiving space, and which is operated by the cassette inserted into the receiving space, in order to release the arm for lowering onto the stack, and    providing at least one operating protrusion arranged in a cassette that acts on the slide during insertion of the cassette and moves it against the spring force against the slope and acts on the slide and moves it against the spring force into the position that releases the arm.    
   
   
       18 . A method according to  claim 17 , wherein the operating protrusion is formed as a pin protruding from a cassette in the insertion direction, which acts on the slide and pusher via wedge surfaces, and wherein the slide has a passage opening for the pin, and a wedge surface is formed in the passage opening, which the pin encounters during insertion into passage opening, in order to move the slide against the spring force.  
   
   
       19 . A method according to  claim 7 , wherein the arm, together with a parallel rod, forms a parallel guide for the advance head, the parallel rod is lengthened beyond its bearing on the slide, and wherein the pusher engages on this lengthened end of the parallel rod.  
   
   
       20 . A method according to  claim 19 , wherein the lengthened end passes through an elongated hole of the pusher, is freely movable in this elongated hole in the release position and is entrained by the end of the elongated hole when the pusher is moved into the position that raises the arm under the spring force.