Patent ID: 7089078

Claim:
A method for changing the spacing at which a tool ( 6 , 7 )—which is disposed on a radial outside of at least one associated rotating roller ( 4 , 5 )—engages with a passing material web ( 1 ) moving in a straight line at a constant speed, where in a form of a disk-cam control for a duration of the engagement of the tool ( 6 , 7 ) with the material web ( 1 ), a circumferential speed of the tool ( 6 , 7 ) is synchronized with a speed of the material web ( 1 ) and for a time, a desired engagement spacing is determined by an increased or reduced circumferential speed of the roller ( 4 , 5 ), characterized in that in order to execute a changeover of an engagement spacing of the tool ( 6 , 7 ) with the material web ( 1 ), first a number of different engagement spacings are electronically predefined in a retrievable form in conjunction with different corresponding circumferential speeds of the tool ( 6 , 7 ), wherein after an activation of a changeover switch ( 13 ), a change to another predefined engagement spacing during operation is executed precisely at a moment the tool ( 6 , 7 ) engages so that a next time the tool ( 6 , 7 ) engages with the material web ( 1 ), a new engagement spacing is executed wherein a disc cam table determines a differential curve used for the acceleration or braking of the roller ( 4 , 5 ), thus permitting a compensation motion to be produced between the circumferential speed of the tool during engagement and the circumferential speed outside the tool engagement.