METHOD FOR CORRECTING AN INCLINED POSITION OF A PRODUCT EXITING A GAP OF TWO FOLDING ROLLERS OF A LONGITUDINAL FOLDING MACHINE AND SAID LONGITUDINAL FOLDING MACHINE

摘要

The invention relates to a method for correcting an inclined position of a product (03) leaving a nip between two folding rollers (07) of a longitudinal folding machine (01), wherein said product (03) is pressed into the nip between the rollers by a folding blade (04) that can be moved up and down relative to the folding table (02), then leaves the nip between the rollers and is transported in a direction of transport (T2). The moment of passage of a leading or trailing edge of a product is detected at two measurement points (S5; S6) which are spaced apart from one another and arranged transversely to the direction of transport (T2) of the product (03) to be folded. Based on the moments of passage detected at the two measurement points (S5; S6) and on commutation and/or data processing techniques, a deviation Δt2 between a time offset detected during the passage of the corresponding product edge at the two measurement points (S5; S6) and a nominal time offset is determined and analyzed. In the event that the deviation Δt2 exceeds at least the tolerance range, a measure is initiated by means of a control process (39) in order to act against the deviation Δt2, said measure being based on retaining the product (03) to a greater or lesser extent when passing the folding rollers (07) and/or on more or less friction between the braking elements (31; 32; 33; 34) and the product (03). The invention also relates to a longitudinal folding machine.