Out of media detection system for a roll media feed apparatus

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 26/00 (2006.01) B65H 7/02 (2006.01) G03G 15/00 (2006.01)

Patent

CA 2145114

An end of media detection system is provided for a system which unrolls a media supply such as paper from a cylindrical core substrate. One (trailing) edge of the media is attached to the core substrate. As part of the media detection system, a shaft which is positioned within a pair of cradles supports the cylindrical core. One of the cradles houses a plastic slide, which in turn acts vertically on the actuator of a microswitch when the shaft is in place. The weight of the shaft and media roll acting on the microswitch keeps the microswitch in an inactive state, however, as the media on the roll is played out, at some point just before the media is exhausted the shaft is moved upward due to the adhesive attachment of the trail edge of the media to the core substrate. Movement of the shaft relieves the pressure on the actuator of the microswitch thereby actuating the microswitch to send a signal to a controller to stop rotation of the shaft. This prevents a situation where the sheet still attached to the core stalls at the end of media feed.

Système de détection de fin de matériau pour dispositif de déroulement d'un matériau comme le papier depuis un substrat de noyau cylindrique. Un bord arrière du matériau est fixé au substrat. Un arbre, faisant partie du système de détection, est positionné à l'intérieur d'une paire de berceaux pour supporter le noyau cylindrique. Un des berceaux loge une coulisse de plastique qui se déplace verticalement sur l'actionneur d'un microcontact lorsque l'arbre est en place. Le poids de l'arbre et du rouleau de matériau sur le microcontact permet de le garder dans un état inactif. Toutefois, juste avant que le matériau ne soit complètement déroulé du rouleau, l'arbre est déplacé vers le haut grâce à la fixation adhésive du bord arrière du matériau fixée au substrat. Le mouvement de l'arbre décompresse l'actionneur du microcontact, ce qui amène ce dernier à transmettre un signal à un contrôleur afin d'interrompre la rotation de l'arbre. Cela permet d'éviter une situation où la feuille encore fixée au noyau ne bloque à la fin du cycle d'alimentation.

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