Patent ID: 8979011
Filing Date: 2015-03-17
Classification: B65H

Abstract:
1. A method for separating a web material in a winding machine comprising an upper winding roller, at least one guide plate, a lower winding roller, and a rider roller, wherein the guide plate is arranged at a location close to and below the upper winding roller and forms a channel with the upper winding roller, the upper winding roller, the lower winding roller, and the rider roller forming therebetween a winding nip, a separation mechanism being arranged below the upper winding roller and comprising a pivot shaft and a pinch arm extending from the pivot shaft, the pinch arm having a web engagement end forming at least one suction opening, the method comprising the following operations: (a) having a web material borne on a lower circumferential surface of the upper winding roller rotatable in a predetermined rotation direction to feed the web material into and through the channel; (b) winding the web material passing through the channel around a first core in the winding nip to form a paper roll; (c) rotating the pinch arm, the web engagement end thereby periodically reaching an engagement position where the web engagement end opposes the upper winding roller, the web engagement end of the pinch arm engaging the web material at the engagement position without bearing against the upper winding roller, the web engagement end at the engagement position maintaining a predetermined spacing from the upper winding roller, such that the pinch arm does not contact the upper winding roller; (d) causing the suction opening to suck and hold the web material disposed in the channel against the web engagement end at the time the web engagement end of the pinch arm is at the engagement position; and (e) subjecting the web material to a pulling force induced by the paper roll formed in the winding nip to tear and separate the web material at a location between the engagement position and a position of the paper roll of the first core; wherein the pinch arm is rotatable in a direction opposite to the predetermined rotation direction of the upper winding roller; and, operation (c) further comprises a sub-step of reducing rotational speed of the lower winding roller to have the web material slightly slackened.