Method for controlling the speed of horizontally rotatable...

Details Method for controlling the speed of horizontally rotatable... Method for controlling the speed of horizontally rotatable...

B - Operations, Transporting

65

H

B65H 43/08 (2006.01) B65H 20/26 (2006.01) G03B 21/32 (2006.01) G03B 21/48 (2006.01)

Patent

CA 2232306

Method for controlling the speed of horizontally rotatable supply turntables for tape material. In such a method for controlling the speed by measurement on a moving tape, especially on a film tape (3) in cinema show operation by removal from the inside convolution (4) of a reel (2) resting horizontally thereupon, the lead-in angle in front of a lead-in point (6) fixed in location is contactlessly measured by reflection of infrared light on both sides of the film strip (5) fed in. In case of deviations of the measurement signal from a nominal value, the reel drive is corrected. A dual infrared LED with reflection light barriers (11, 12) arranged offset in angle and height and approximately focused on the lead-in point (6) is used.

Méthode pour contrôler la vitesse de plateaux horizontaux tournants d'approvisionnement en ruban. Suivant cette méthode de contrôle de la vitesse au moyen de mesures d'un ruban en mouvement, en particulier d'un ruban de film cinématographique (3), extrait de la périphérie intérieure (4) d'une bobine (2) reposant à l'horizontale sur le plateau, l'angle devant le point d'entrée (6) fixe est mesuré sans contact par réflexion de lumière infrarouge des deux côtés du ruban (5) introduit. En cas d'écarts du signal de mesure par rapport à une valeur nominale, l'entraînement de la bobine est rectifié. Une DEL double infrarouge à barrières antireflets (11, 12) présentant un décalage angulaire et un décalage en hauteur, approximativement centrées sur le point d'entrée (6) est utilisée.

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