Method for calibrating the position of the slitter blades of a slitter-winder

摘要

The positions of the slitter blades of a slitter-winder are calibrated using a laser to perform measurement and calibration of the fiber web cutting point of each slitter blade pair. Measurement and calibration is preformed on the top slitter blade of each of a multiplicity of slitter blade pairs one after another. The laser measures one slitter blade of each slitter blade pair while they are engaged. The slitter blade pairs between the laser and the slitter blade pair being measured are not engaged. Carriages which support the slitter blades have position sensors which the laser measurements calibrate and the blade pair positions are measured and the carriage positions are read simultaneously. The cutting edges of the slitter blades are sharpened to have straight sides and the laser measurement system is located so the laser beam is directed to the straight side.

主权项

1. A method for calibrating the positions of slitter blades of a slitter-winder in a fiber web production line, where movement of the fiber web through the slitter-winder defines a machine direction, and a cross machine direction is defined perpendicular to the machine direction,
wherein the slitter-winder has a plurality of cross machine direction arrayed slitter blade pairs, and at least one slitter blade of each slitter blade pair is mounted to a carriage for movement upwards and downwards with respect to the carriage for changing a distance with respect to a second slitter blade of the slitter blade pair for engaging and correspondingly opening each slitter blade pair, and wherein the carriage is mounted for movement in a cross machine direction on a guide of the slitter-winder to slitting positions for slitting the fiber web into partial webs in the machine direction of the fiber web, the method comprising the steps of: measuring in each pair of slitter blades with a laser having a cross machine direction extending beam, a cross machine direction position of a first slitter blade engaged with a second slitter blade forming each pair of the plurality of slitter blade pairs, wherein the first slitter blade is mounted to a first carriage movable in the cross machine direction on a first guide in the slitter-winder, and wherein the second slitter blade is mounted to a second carriage movable in the cross machine direction on a second guide in the slitter-winder, wherein the measuring in each pair of slitter blades is conducted while the slitter-winder is in standstill and no fiber web is running, and wherein slitter blade pairs between the laser and the pair of slitter blades being measured are open so as not to block the laser beam from reaching the pair of slitter blades being measured; measuring a position of each first carriage in the cross machine direction with a first carriage position sensor; comparing the cross machine direction position of each first slitter blade, with the position of each first carriage in the cross machine direction as measured with the first carriage position sensor; and calibrating each first carriage position sensor, so that each first slitter blade can be positioned based on each first carriage position sensor.