Patent GB-191227152-A (GB)
Title: Improvements in Tubular Welt Knitting Machines.
Inventor: WILDMAN FRANK BLACK
IPC: D04B9/06
Filed: 1912-11-26
Granted: 1913-03-06
Abstract: 27,152. Wildman, F. B., and Ballard, G. L. June 18, [Convention date]. Circular machines.- Relates to a multi-feed machine for the automatic production of tubular rib fabric welted at both ends for bodies of garments &c. The cams are arranged in sets complete for two feeds. Fig. 3 shows one cylinder set consisting of a fixed advancing cam 1, an adjustable stitch cam 2, a movable clearing-cam 3, 4, a fixed cam 5 for lifting the cylinder needles into a latchopening brush, a movable cam 6, 6<1> which acts as an advancing cam for the second feed of the set during the production of rib fabric but is dropped during the formation of tubular welts, and a second stitch cam 8. Each set of dial cams comprises wing cams 1', 6<11> for advancing the needles, and stitch cams 2<1>, 8<11>. When the lower end of the garment body is to be knitted, the wing cams 1<1> are thrown into welt position, and there thus results a series of single course welts alternating with ordinary rib fabric. When sufficient welt courses have been made to prevent unravelling, the cam 3, 4 is raised to clear the loops off the cylinder needles and the machine commences to knit a tubular welt for the next piece of fabric. When all the cylinder needles have drawn thread at the cam 8, the cam 6, 6<1> is dropped to prevent loops from being formed at these feeds, rib loops being formed, however, at the co-operating dial cams 6<11>. In a similar way the dial needles miss at the cams 1<1> while the co-operating cylinder needles knit at the cams 2. Thus a tubular welt of double-walled plain fabric is produced. The cams 6, 6<1> are all controlled in unison by pattern gear, each cam 6, 6<1> being mounted on a sliding post 7 moved up and down by bell-cranks 9 connected by rods 12 to a ring seated in an annular recess of the dial cam cap. The ring is shifted as required to operate the cams 6, 6<1> by means of a rod 14 connected to a pattern lever, one arm 16" of which is held down to a pattern wheel 17 by a spring 18 acting on a second arm 16<1>. The downward movement of the cams 6, 6<1> takes place in two steps, the first step permitting the cylinder needles to rise to the tucking level, to prevent any of the needles from being placed out of action before they have again taken thread. To permit of this movement, one of the bell-cranks 9 has a third arm 20 which normally engages a catch 21 and stops the further downward movement of the cams. The catch is released after a fraction of a revolution of the machine by a rotating cam 22 which operates a lever 24<1> on a shaft 25, an arm 27 on the upper end of which thrusts forward a slide 28. The slide moves an arm 30 on a shaft 31, the upper end of which carries the catch 21. This release movement occurs at every revolution of the cylinder but only has effect on the working of the machine at the commencement of each tubular welt. The slide 28 is also used for feeding the pattern-wheel forward. The wing cams 1', the stitch cams 2, 8, and the clearing- course cams are also operated by rings under the control of pattern wheels in a similar manner to cams 6, 6<1>. The cylinder needles draw longer loops during the production of plain fabric than when making rib fabric. The wing, guard, and dial stitch cams are mounted on removable sections 52 secured to the main part 51 of the dial cap. The tucking-cam 54 is separately attached to this part and is caused to overhang the base of the wing cams 1<1>, 6<11> at 56<Î> to prevent needles from passing through the passage 55. The latch-opening brushes are thrown out of action except when welts are being made. Specification 26,140/07 is referred to.