Constant gap document feeder and method of operation thereof

B - Operations – Transporting – 65 – H

Patent

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B65H 7/14 (2006.01) B65H 7/02 (2006.01)

Patent

CA 2106684

A controller (25) ensures a desired constant gap between a trailing edge of a first document and a leading edge of a subsequent document. The controller (25) decreases the speed of a feeder transport (22) upon the detection of a leading edge of a first document at an entrance to a take-away transport (24). The controller (25) then linearly increases the speed of the feed transport (22) along a speed ramp (R) until a trailing edge of the first document is detected. Upon the detection of the trailing edge of the first document, the controller (25) sets the speed of the feeder transport (22) to a constant value (S4). Thereafter the controller (25) detects a leading edge of the subsequent document. The controller (25) determines the magnitude of an initial gap (I) between the trailing edge of the first document and the leading edge of the subsequent document.

Un dispositif de commande (25) maintient un intervalle constant désiré entre un bord arrière d'un premier document et un bord avant d'un document succédant au premier. Le dispositif de commande (25) réduit la vitesse d'un transporteur d'alimentation (22) lorsqu'il détecte le bord avant d'un premier document à l'entrée d'un transporteur de sortie (24). Le dispositif de commande (25) augmente ensuite de façon linéaire la vitesse du transporteur d'alimentation (22) par rapport à un accroissement linéaire (R) de vitesse, jusqu'à ce que le bord arrière du premier document soit détecté. Lorsque le dispositif de commande (25) a détecté le bord arrière du premier document, il règle la vitesse du transporteur d'alimentation (22) à une valeur constante (34). Après ceci, le dispositif de commande (25) détecte un bord avant du document suivant, et détermine la largeur d'un intervalle initial (I) entre le bord arrière du premier document et le bord avant du document suivant.

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