Guide system to guide paper webs

Abstract

Guide system for the handling paper material webs comprising:gripping means (1) configured to engage a web (W) of paper material to control its movement according to a predetermined direction of advancement (WF);structure (2) for supporting said gripping means (1);hooking means (4) adapted to temporarily hook a lateral edge (SW) of the web (W), said hooking means being arranged downstream of the gripping means (1) with respect to the aforementioned direction of advancement (WF);whereinsaid hooking means (4) comprise a flexible member (40) equipped with tips (46) adapted for engaging the lateral edge (SW) of the web (W), the flexible member (40) being mounted on a support (41) movable between a hooking position and an inoperative position.

1 . Guide system for handling of paper material webs comprising:
 gripping means ( 1 ) configured to engage a web (W) of paper material to control its movement according to a predetermined advancement direction (WF);   a structure ( 2 ) for supporting said gripping means ( 1 );   hooking means ( 4 ) adapted to temporarily hook a lateral edge (SW) of the web (W), said hooking means being arranged downstream of the gripping means ( 1 ) with respect to the aforementioned advancement direction (WF);   characterized by the fact that   said hooking means ( 4 ) comprise a flexible member ( 40 ) provided with tips ( 46 ) adapted for engaging the lateral edge (SW) of the web (W) while the same flexible member ( 40 ) is moved along a path (P 4 ) which has a first section (PH) and a second section (PT), the flexible member ( 40 ) being mounted on a support ( 41 ) that can be moved between a hooking position in which the first section (PH) overlaps a path (PW) followed by the lateral edge (SW) of the web (W) and an inoperative position in which said first section (PH) is spaced from the path (PW) followed by the lateral edge (SW) of the web (W), and the second section (PT) of the path (P 4 ) is a section along which the web (W) moves away from the point where it is hooked.   
     
     
         2 . System according to  claim 1  characterized by the fact that it comprises cutting means ( 5 ) adapted to transversely cut the web (W), arranged upstream of said hooking means ( 4 ) with respect to the aforementioned direction of advancement (WF), said cutting means being constrained to a respective movable support ( 51 ) which moves them transversely to the direction (WF) of advancement of the web (W) and being activated when the hooking means ( 4 ) engage the lateral edge (SW) of the web (W). 
     
     
         3 . System according to  claim 1  characterized in that the flexible member ( 40 ) is a belt and the tips ( 46 ) consist of nails inserted in the belt. 
     
     
         4 . System according to  claim 3  characterized in that said belt is a belt with a rectangular cross section, or a belt with longitudinal grooves, or a belt with a trapezoidal cross section. 
     
     
         5 . System according to  claim 3  characterized in that the tips ( 46 ) are distributed over the entire length of the belt ( 40 ) or are distributed over predetermined portions of the belt ( 40 ) so as to provide a segmented hooking surface. 
     
     
         6 . System according to  claim 1  characterized in that the hooking means ( 4 ) comprise a presser ( 42 ) configured to act on the lateral edge (SW) of the web (W). 
     
     
         7 . System according to  claim 6  characterized in that the presser ( 42 ) consists of a brush located on an opposite side of the belt ( 40 ) with respect to the path (PW) followed by the lateral edge (SW) of the web (W). 
     
     
         8 . System according to  claim 2  characterized in that said cutting means ( 5 ) comprise a blade ( 50 ) mounted on a mobile support ( 51 ) which, in turn, is mounted on a rectilinear guide ( 2 G) arranged on said structure ( 2 ) and is controlled by a respective actuator ( 52 ). 
     
     
         9 . System according to  claim 1  characterized in that said structure ( 2 ) comprises two uprights ( 20 ) joined at the top by a crosspiece ( 21 ) and said rectilinear guide ( 2 G) is arranged on the crosspiece ( 21 ). 
     
     
         10 . System according to  claim 8  characterized by the fact that the blade ( 50 ) is mounted on a lever ( 5 L) controlled by a respective pneumatic actuator ( 55 ) mounted on the mobile support ( 51 ), and the actuator ( 55 ) allows to move the blade to and from the gripping means ( 1 ). 
     
     
         11 . System according to  claim 10  characterized in that an end of the lever ( 5 L) is hinged on the actuator ( 55 ) and the blade ( 50 ) is mounted on the other end of the lever ( 5 L). 
     
     
         12 . System according to elaims  8 - 11   claim 8  characterized in that said structure ( 2 ) comprises two uprights ( 20 ) joined at the top by a crosspiece ( 21 ) and said rectilinear guide ( 2 G) is arranged on the crosspiece ( 21 ), the blade ( 50 ) is mounted on a lever ( 5 L) controlled by a respective pneumatic actuator ( 55 ) mounted on the mobile support ( 51 ) and the actuator ( 55 ) allows to move the blade to and from the gripping means ( 1 ), an end of the lever ( 5 L) is hinged on the actuator ( 55 ) and the blade ( 50 ) is mounted on the other end of the lever ( 5 L) and the assembly formed by the blade ( 50 ), the actuator ( 55 ) and the lever (SL) is integral with an arm ( 54 ) rotatably constrained to the mobile support ( 51 ).