Patent GB-1002576-A (GB)
Title: Apparatus for marking stockings in a circular knitting machine
Inventor: VACLAVIK JAROSLAV
IPC: D04B9/46
Filed: 1962-02-12
Abstract: 1,002,576. Knitting. SDRUZENI PODNIKU TEXTILNIHO STROJIRENSTVI. Feb. 12, 1962, No. 3245/62. Headings D1C and D1K. A circularly knitted stocking welt is marked by an arrangement of thick stitches formed when lifting cams which co-operate with the butts of pattern jacks beneath the needles are partly retracted by means of the main pattern chain so as not to engage certain shortened butts associated with the needles which are to form the tuck stitches. Cylinder 1 is controlled by control drum 4 which is coupled to a ratchet wheel 5 carried on a shaft 6 and engaged by a pawl 7 oscillated by a toothed segment 8. A freely rotatable sprocket 10 on shaft 6 carries a chain 11 consisting of standard links 12 and other links with lugs 13 of width "w" which control picker 14 which is used during knitting of the toe and heel and also a link 15 (not shown) with a lug of width "2w". The chain is advanced half a link for each two rotations of the needle cylinder. Shaft 6 drives, through gearing, a control drum 22 which rotates synchronously with drum 4. Control cams 23 on drum 4 control movable heel stitch cam 28 through rods 24, 26 and bell crank lever 25. The needle jacks have guide butts 34, 35 and frangible butts 37, 38, 39, 40 which co-operate with movable lifting cams 41, 42, 43, 44 spring biassed towards the needle cylinder. Cams 41-44 may be jointly or severelly pressed away from needle cylinder 1 so that the corresponding needles which would normally be raised to knitting level remain at tuck level. The cams are controlled by levers 47, 48, 49, 50 pivoted on trunnion 51 and operated by cams 52, 53, 54, 55 carried on a shaft 59 rotatable by the main shaft. Shaft 59 is mounted in a pivoted beering 60, biased by spring 63 into working position in engagement with an adjusting screw 65 and movable by lever 68 into rest position. This arrangement is used for knitting all-over tuck work. The apparatus A for marking the stocking by forming groups of tuck stitches in the welt comprises a lever 71 with a hub 72 loosely rotatable on an adjustable eccentric shaft 73. One arm of lever 71 carries a pin 76 having a cylindrical part 78 which engages levers 49, 50 which carry cams 43, 44 which engage the butts 39, 40 of jack 33. A groove 79 in pin 76 ensures that lever 56 which displaces cam 45 is uninfluenced when cams 43, 44 are displaced. The free end of lever 71 adjacent pin 76 engages a set screw 80 mounted in a bush secured on trunnion 5. The other end of lever 71 engages a head piece 84 comprising parts 85, 86 having corresponding flats 87 and secured to the upper end of a rod 89. Secured to rod 89 is a setting ring 91 which co-operates with a push rod to control picker 14. A compression spring 93 encircling rod 89 engages the underside of the bed plate 2 and an adjustable ring 94 connected by link 96 to release lever 68. The lower end of rod 89 is freely rotatable and axially displaceable in a block 97 in which a rod 99 is secured. A compression spring 100 encircles rod 89 and presses block 97 downwards. The lower end of rod 99 is pivoted to a pivoted stirrup 102 which carries a spring biased pin 107 which engages the lugs 13 or 15 of the chain links. The upper end of a connecting rod 110 is secured on the other end of pin 107 and has a slit 113 in its lower end engaging a fixed pin 114. A pin 116 on rod 110 co-operates intermittently with the bent end of an interrupter 117 whose-other end is connected to lever 19, Fig. 1. Interrupter 117 moves in a guide piece 119 and rests on the surface of a ring 21 secured to shaft 6 and having flats 122, 123 formed on its surface. The butts 135 of jacks corresponding to needles which are to form the marking tuck stitches are shortened when the marking tuck stitches are to be formed, apparatus B for forming all over tuck work is moved out of operation but lever 71 remains in position VII with its end 83 engaging part 85. Since cams 52-55 do not act on levers 47-50, cams 41-45 remain in operation and lift all jacks by engaging butts 37-40 and 135 and all needles knit. When cam 23 raises push rod 24, lever 25 is swung and connecting rod 26 moves heel stitche cam 28 away from the needle cylinder. Ring 121 is turned into the position shown in, Fig. 8, interrupter 117 engages bearing surface 122 and when roller 108 engages a link 112, interrupter 117 is clear of pin 116 but if a link 13 engages roller 108, pin 116 is moved into the path of interrupter 117. When roller 108 engages a lug 13 or 15, stirrup 102 is pivoted and rods 89, 99 raise head 84 so that bevelled part 86 engages lever 71 to swing levers 49, 50 away from the needle cylinder so that they do not engage butts 135 and the corresponding needles remain at tuck level. When roller 108 and rods 89, 99 are roused, pin 116 moves into the path of interrupter 117 and rod 110 is swung sideways moving pin 107 horizontally and roller 108 clear of the lug 13, spring 109 being compressed. Spring 93 pushes rods 89, 99 downwards, turns stirrups 103 to its original position, roller 108 drops into position engaging the face of lug 13 and interrupter 117 moves away from rod 110. When lug 13 is moved on, roller 108 is returned by the action of spring 109 to its original position. The roller 108 actually rests on lug 13 for two and a half revolutions of the needle cylinder and on lug 15 for four revolutions.