Paper forming device of a paper-making machine

Abstract

A paper forming device of a paper machine enables a change-over between a thin paper high velocity forming and a thick paper forming. In the paper forming device, stock liquor S is discharged from a headbox 1 onto a wire 2 and, while being transferred on the wire 2, is dewatered by a dewatering equipment and further by a suction box 6. A forming roll 13 , wound with an extended felt 7, is arranged movably up and down above the wire 2 near the headbox 1. When a thin paper is to be formed, the forming roll 13 is moved down so that a nip of the stock liquor is formed between the wire 2 and the felt 7. Thereby, the stock liquor S discharged from the headbox 1, can be comparatively immediately nipped between the wire 2 and the felt 7.

What is claimed is:  
     
         1 . A paper forming device of a paper machine in which stock liquor is discharged from a headbox onto a wire so that said stock liquor, while being transferred on said wire, is dewatered by a dewatering equipment and is further dewatered by a suction box, constructed such that a forming roll, wound with a felt, is arranged movably up and down above said wire near said headbox and, when a thin paper is to be formed, said forming roll is moved down so that a nip of said stock liquor is formed between said wire and said felt.  
     
     
         2 . A paper forming device of a paper machine as claimed in  claim 1 , constructed such that, when said forming roll is moved down, said wire is pressed down by said forming roll and said headbox and a forming board, arranged under said wire, are inclined in the same direction as a running direction of said wire.  
     
     
         3 . A paper forming device of a paper machine as claimed in  claim 1 , constructed such that a wire roll is arranged upwardly movably under said wire downstream of said forming roll and, when said wire roll is moved up to thereby lift up said wire, said forming roll is moved down so that a horizontal running direction of said wire near said headbox is maintained.