Patent GB-190600738-A (GB)
Title: Improvements in and relating to Circular Knittign Machines.
Inventor: BETTNEY HENRY ARTHUR
Filed: 1906-01-11
Granted: 1907-02-11
Abstract: 738. Bettney, H. A. Jan. 11. Circular knitting-machines.-Relates to an improved machine -of the type in which double-ended latch needles are disposed in two fixed cylinders placed end to end. While making plain work the active needles are in the botton cylinder, and for the sequence of plain work changing to 1/1 rib, then again to 3/1 rib, and lastly back to plain work, half these needles may be fixed to the jacks. The remaining needles are double-ended with two swells in the stem, so that they may be engaged either by the upper jacks 34 or the lower jacks 33. The jacks in the bottom cylinder have graded end butts a, b, c, d, arranged in the order a, b, a, c for the instep needles, and in the order a, b, a, d for the remaining needles. Fig. 2 is a development of the rotary cam-carriers the arrow representing the virtual movement of the jacks. Before a transference takes place, the jacks are brought into a suitable position by the insertion of cams 26, 31. The springs 37, Fig. 6, then act on the part 35<a> of each jack 33 to force it away from its needle, the latter being now in contact with the upper jack 34. The slight lateral play required by the jacks is allowed by the recessed areas 52, 51 of the ribbing- cams and frame-jack supporting ring respectively. In the further rotation of the cam-carriers, the graded butts of the jacks come over a sliding transfer cam 60. This can either be inoperative or assume one of four operative positions. The first position effects a lowering of the jacks with the butts a sufficient for the knitting-butt 35 of each jack to be deflected by a cam 30<a> into the knitting- cams, and the cam 60 thus effects a change from plain to 1/1 rib work. The jacks with the butts b, c, d remain elevated and serve as latchguards to the corresponding needles. In the second position, the cam 60 engages the butts a, b and effects the change from 1/1 to 3/1 rib. In the third position, the cam 60 engages the butts a, b, c and changes the 3/1 rib on the back half of the stocking to plain knitting. In the fourth position, the cam 60 engages all the butts, and plain knitting all round is obtained. The picking-mechanism for fashioning the heel and toe comprises a downthrow picker 39 and a pair of up-throw pickers 43, 44. The latter are pivoted levers, studs 45, 46 on the short arms of which can be engaged by pivoted inclines 47, 48, Fig. 7, moved in their path by pattern mechanism. When the studs engage the inclines on the vertical side, the latter are moved aside on their pivots without the pickers 43, 44 being affected. The sinkers employed are pivoted to the outside of the lower needle cylinder and keep the two cylinders in register. The arm which carries the upper cylinder, is mounted on a vertical screwed shaft which can be rotated to alter the length of the loops. The cylinders are mounted to run on balls. The various knitting- cams can be raised or lowered by slides, operated by hand or pattern-mechanism. The clearing-cam 24<a> is raised when it is required to knit a tuck or welt