De acuerdo con un aspecto del invento se ha proporcionado un método de tricotar tejidos tubulares en el que se ha usado una tricotosa plana, que está provista de al menos un par de lechos de agujas, uno en la parte frontal y uno en la parte posterior, siendo al menos uno de dichos lechos de agujas capaz de ser desplazado lateralmente, está provista de un primer alimentador de hilo y un segundo alimentador de hilo, que son capaces de moverse en vaivén en diferentes carriles de guiado uno en la parte frontal y uno en la parte posterior, y está provisto de al menos dos sistemas de tricotar, dichos primer y segundo alimentadores de hilo son usados como un alimentador de hilo precedente y un alimentador de hilo siguiente, se usa un tricotaje de doble sistema para tricotar un primer tejido tubular que comprende un primer tejido y un segundo tejido que son unidos en ambos bordes de los mismos, y para tricotar un segundo tejido tubular que comprende un primer tejido y un segundo tejido que están unidos en ambos bordes de los mismos usando agujas de un área de tricotaje diferente de la del primer tejido tubular tricotado, el borde del primer tejido tubular en el lado del segundo tejido tubular es ensanchado para tener diámetros deseados del tejido tubular, a continuación el primer tejido tubular y el segundo tejido tubular son unidos juntos,
According to one aspect of the invention there is provided a method of knitting tubular fabrics wherein is used a flat knitting machine, which is provided with at least a pair of needle beds, one in the front and one in the back, at least one of said needle beds being able to be racked sidewise, is provided with a first yarn feeder and a second yarn feeder, being able to be reciprocated on different guide rails one in the front and one in the back, and is provided with at least two knitting systems, said first and second yarn feeders are used as a preceding yarn feeder and a succeeding yarn feeder, double system knitting is used to knit a first tubular fabric comprising a first fabric and a second fabric being joined at both edges thereof, and to knit a second tubular fabric comprising a first fabric and a second fabric being joined at both edges thereof by using needles of a knitting area differing from that of the first tubular knitted fabric, the edge of the first tubular fabric on the side of the second tubular fabric is broadened to have desired diameters of the tubular fabric, then the first tubular fabric and the second tubular fabric are joined together, said method of knitting tubular fabrics being characterized in that in knitting a course for forming a broadened portion on the edge on the lower end of the knitting direction of the first tubular fabric, a yarn feeder of which front and back agrees with the front and back of the fabric to be knitted is used as the preceding yarn feeder, and the step of forming a broadened portion in the first tubular fabric includes the following steps: (a) a step wherein the preceding first yarn feeder is used to knit the first fabric, and yarn is newly fed to a needle of the opposing needle bed being located on the lower side of the knitting direction of the course and to a needle of the original needle bed in the knitting direction; and then (b) a step wherein the succeeding second yarn feeder is used to knit the first fabric, and yarn is fed again to only either one of the groups of needles to which yarn was newly fed by the first yarn feeder in said step a.