Patent ID: 6092452
Filing Date: 2000-07-25
Classification: B23D,B26D,Y10T

Abstract:
A device for lengthwise slitting a web fed in a direction of forward travel, the device comprising:a first series and a second series of slitting tools for slitting said web along lengthwise slit lines;control means for moving said slitting tools of said first series and said second series alternately between a slitting position and an inactive position, the tools of one of said first series or said second series being in the slitting position while the tools of the other series are in the inactive position, and vice versa, said control means operable to modify positions of the slitting tools; andan auxiliary slitting means for generating a joining slit not parallel to the direction of forward travel of the web in a job changeover zone between a previous job and a following job;wherein at least some of the slitting tools of said first series and said second series of slitting tools can be moved from said slitting position to said inactive position, and vice versa, independently of other tools of a same series, andwherein said control means delays movement of one slitting tool belonging to the tools temporarily in the slitting position from said slitting position to the inactive position, and advances movement of one slitting tool belonging to the tools temporarily in the inactive position, from the inactive position to the slitting position, to extend a lengthwise slit line from the previous job and a lengthwise slit line for the following job into the job changeover zone, said auxiliary slitting means joining up each extended slit line by means of said joining slit.