Saw assembly

A - Human Necessities – 01 – G

Patent

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Details

A01G 23/091 (2006.01)

Patent

CA 2291161

A saw assembly for a grip-harvester has a saw chain (4) running around a bar (3) and a chain sprocket (5); a bar holder (2) pivotably journalled on the saw assembly stand (1); a saw motor (6) driving the chain sprocket (5); and a device (14) for feeding the bar out and in, said feeding-out and feeding-in device (14) comprising a hydraulic cylinder (17) mounted on the stand (1) and having a piston rod (19). According to the invention the movements of the piston rod (19) are transmitted to the pivotable bar holder by means of a pivotably journalled toothed wheel (26) which is joined to the bar holder (2) and has a toothed wheel rim (27) cooperating with the piston rod which is in the form of a rack. The saw assembly is also provided with a device for sensing and recording the angular position of the saw bar (3) in relation to an initial position, which device has a smaller toothed wheel (60) in engagement with the larger toothed wheel (26) of the feeding-out and feeding- in device (14), and also a sensor (61 or 62) which senses a tooth gap or a tooth on said smaller toothed wheel (60).

L'invention concerne un ensemble scie destiné à une machine d'abattage. Cet ensemble possède une chaîne (4) tournant autour d'une lame (3) et d'un pignon d'entraînement (5); un support de lame (2) monté pivotant sur la traverse (1); un moteur (6) entraînant le pignon d'entraînement (5); et un dispositif (14) permettant d'avancer ou de tirer la lame. Ce dispositif d'avancement et de retrait comprend un vérin hydraulique (17) monté sur la traverse (1) et une tige de piston (19). Selon l'invention, les mouvements de la tige de piston (19) sont transmis au support de lame pivotant au moyen d'une roue dentée (26) montée pivotante, qui est assemblée au support de lame (2) et a une denture (27) qui coopère avec la tige de piston conçue sous forme de tige dentée. L'ensemble scie est également doté d'un dispositif de détection et d'enregistrement de la position angulaire de la lame (3) par rapport à une position initiale. Ce dispositif a une petite roue dentée (60) en prise avec la grande roue dentée (26) du dispositif d'avancement et de retrait (14), et aussi un capteur (61 ou 62) qui détecte un entredent ou une dent sur la petite roue dentée (60).

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