Device for detecting end of paper in a printer

B - Operations – Transporting – 41 – J

Patent

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Details

B41J 29/48 (2006.01) B41J 11/00 (2006.01)

Patent

CA 2527966

The device (18) for detecting end of paper comprises a support (43) mounted on a wall (26) of a printer (10) of receipts, obtained from a tape (12) of paper wound on a roll (14), contained in a housing (15) of the printer (10). The printer (10) is preferentially employed at a Point Of Sale (POS) and may be arranged on a horizontal work plane (21) set on its base (22), or inclined by about 90~, on a front wall (24). As a result, the roll (14) is set into the housing (15) alternatively in two positions, corresponding to the inclination assumed by the printer. A detecting lever (54) in hinge-mounted on the support (43) and is provided with two arms (55, 56) spread apart, forming an angle of approximately 120~. Fixed to each of the ends of the arms (55, 56) is a projecting element (58, 60), each of which suitable for engaging a hole in a central sprocket (17) of the roll (14), when the latter has reached its minimum dimension, in which a given length of tape remains of the sprocket (17), indicating that the latter is closed to running out. The two projecting elements (58, 60) are positioned in such a way that only one of these enters the hole in the sprocket (17), when the printer (10) is set in one of the two positions; the support (43) is moved linearly on the wall (26) by way of a toothed cam (47), in order to adapt the position of each of the projecting elements to the dimensions of the sprocket (17) of the paper roll.

La présente invention concerne un dispositif (18) permettant de détecter la fin de papier, qui comprend un support (43) monté sur une cloison (26) d'une imprimante (10) de tickets de facturation, obtenus à partir d'une bande (12) de papier enroulée sur un rouleau (14), contenu dans un boîtier (15) de cette imprimante (10). Cette imprimante (10) est de préférence utilisée sur un point de vente (POS) et peut-être agencée sur un plan de travail horizontal (21) fixé sur sa base (22), ou inclinée d'environ 90 degrés, sur une paroi frontale (24). Il en résulte que, le rouleau (14) est fixé dans le boîtier (15) dans deux positions alternantes, correspondant à l'inclinaison de cette imprimante. Un levier de détection (54) articulé sur le support (43) est pourvu de deux bras (55,56) écartés, formant un angle d'approximativement 120 degrés. Fixé à chacune des extrémités de ses bras (55, 56) un élément fait saillie (58, 60), chacun de ces éléments pouvant s'emboîter dans un trou d'un pignon central (17) du rouleau (14), lorsque ce dernier a atteint sa dimension minimum dans laquelle une longueur donnée de ruban reste de ce pignon (17), indiquant que ce ruban approche de la fin. Ces deux éléments faisant saillie (58 , 60) sont placés de telle manière qu'un seul d'entre eux pénètre dans le trou du pignon (17) lorsque l'imprimante (10) est fixée dans une des deux positions. Le support (40 ans) est déplacé linéairement sur la paroi (26) au moyen d'une came dentée (47), de façon à adapter la position de chacun des éléments faisant saillie aux dimensions du pignon (17) du rouleau de papier. Fonds

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