Patent GB-133221-A (GB)
IPC: D04B9/54
Abstract: 133,221. Stibbe, G. Dec. 12, 1918. Circular machines; knitting welts.-Relates to the production of an improved inturned welt on a seamless hose machine, such as is described in Specification 107,642, by the method which consists in holding up on a circular series of instruments 12 mounted as described in Specification 113,928, the loops of one of the initial courses while the welt fabric is being formed, and subsequently transferring these loops to the needles. Features of the improved welt are the avoidance of overlapping in the region of the commencement and termination of the joining course D and the drawing of the loops of the joining course D in company with the new loops of the first course of the main fabric through loops in the last course of the welt fabric. Preferably, the operation is begun on empty needles, the jacks 12 being withdrawn by a cam 2 so that their butts follow an idle track 34. The jacks are arranged in two groups or sections with long and short butts respectively. At the first revolution of the needle cylinder, alternate needles 40, Fig. 3, are selected by the pattern drum 10, and a complete round A is made on them. At the same. time, the dial 11 is moved down from the normal raised position of ordinary knitting to the welt-forming position. Then 1¢ rounds B are made on all, the needles. A complete round C on the needles 40 is then knitted, and meanwhile the dial cams 1, 2 are moved to a " half-in " position to operate the long-butted jacks idly in a track 42, 43, the cam 2 withdraw. ing these jacks before they reach the yarn taking position c. While this action on the long butts is proceeding, the cam 1 is moved to the " fully-in " position so as to project the short-butted jacks in their turn, and these being missed by the cam 2 which is still in the " half-in " position follow a track 44 and receive yarn at the position c. As soon as the long-butted section of jacks is past the cam 2, this cam is withdrawn so that when the long butts come round again they follow the short butts and receive yarn to form a joining course D on the needles 40, the remaining needles being suppressed during this course. At the same time, the cam 1 is moved to the " half-in " position so as to miss the short butts as they come round again, and is subsequently entirely withdrawn; thus the loops 46 of the course D are laid without overlap, tor the course is started on the first jack in the short-butted section and finished on the last jack in the long-butted section. A further round E is now formed on alternate needles during which the jacks follow an inner path 47 and hold up the loops 46 for subsequent joining of welt and main fabric. After this course, the dial 11 is allowed to move upwards to an extent limited by the fabric between the jacks and the needles, the effect being to tighten the loops 46 well into the hooks of the jacks to obviate accidental shedding of the loops during the knitting of the welt, which is performed on all the needles. On completion of the welt fabric, the cams 1, 2 are again moved to the " half-in " position and then to the " fullin " position, so that first the long-butted jacks and then the short butted jacks are projected to the transfer position at d, Fig. 15, their loops being taken by the corresponding needles 41 which rise up through the bifurcated heads of the jacks. When the jacks retire, their loops are left above the latches of the needles, consequently the joining loops are knitted in with the loops of the first course of the main fabric. The cams 1, 2 are put into action by means of levers 5, 6 operated by cams 9 on the control drum 10. The dial 11 is supported and driven in unison with the cylinder, as described in Specification 113,041; a weight attaclied to a cable 32 assists a spring-pressed pin 15 in holding the supporting arm 8 at the highest position permitted by the control drum 10, which acts on a lever 17 to give the dial its downward displacement. The upward movement of the arm 8 is limited by means of a spring-controlled stop which can be moved by thumb pressure when it is desired to raise the dial from its operative position, and the end 21 of the lever 17 is formed to allow its truck 20 to pass from engagement therewith when the dial is thus raised.