Patent GB-190418003-A (GB)
Title: Improvements in and applicable to Straight Bar Knitting Machines.
Inventor: WOODWARD FREDERICK
Filed: 1904-08-19
Granted: 1905-07-20
Abstract: 18,003. Woodward, F., and Shaw, F. Aug. 19. Straight-bar knitting-machines.-To produce lace and openwork effects in ribbed work, particularly rib tops, made on the Cotton's type of machine, each set of lace points 1 is mounted in a separate bar 3, sliding endwise in a bracket 3<a> oscillating with a shaft 4 which is carried by rocking arms 5. The points are lifted by a cam-lever 8 and link 7, and are lowered by the weight of the parts. For transferring frame-needle loops, straight points are used, but machine needles require points cranked as shown, and given an extra motion by a shaft 10, arms 12, 11, and a link 13. The production of openwork courses is determined by pattern-mechanism, by which the cam shaft 9 is shogged and the transfer cams brought under their respective levers. To effect this, a pattern-controlled arm and a depending linkage hold a rocking arm provided with trucks in the path of a box cam on the shaft 9. The selection of the loops to be transferred is effected by separate pattern mechanism. To shog the point bar 3 the required distance, it is first shifted to allow the insertion of a stepped slide 28, Figs. 3 and 4, by means of a plate 15 on a sliding shaft 16, which is then brought back, as far as a stop 26 on the arm shown will allow, by a spring acting on the bar 3. The slide 28 is connected to the upper end of an arm connected to the vertical arm of a bell-crank lever, having a horizontal arm uplifted by the pattern studs. To transfer loops, the slide 28 with the point bar 3 is moved the space of one needle by means of a rod 37, connecting-link, a bent lever, a vertical link, and a cam-lever. The pattern mechanism includes a pair of studded wheels coupled together and two ratchets of equal size moving together, all loose on a fixed shaft. The ratchets have teeth of the respective sizes of two to one, and are driven by clawkers alternately held out of action by suitablydisposed bluffs. The pattern wheels are rotated either by the engagement of blocks 84, Fig. 8, on one pattern wheel 34 with plates on the smalltooth ratchet 73, or independently of the latter by the clawkers. The welt and slack course camtrucks are adapted to be shogged by suitable side cams on the large-tooth ratchet, which is thereby arrested. When this occurs, the necessary motion for sbogging the cam shaft carrying the welt cams is communicated to the wheel 34 by means of a raised notched plate 86, carried thereby, and on which the clawker plays without rotating the ratchet 73. The pattern wheel 34, Fig. 6, has several rows of stud holes, and the position of a stud 54 therein corresponds to one position of the slide 28. The other pattern wheel determines the sequence of openwork courses and has but one row of studs. To engage with the studs, pivoted fingers 33 are provided to movable arms 32, and are held against stops thereon by springs to allow the pattern plates to move on, if necessary, during the completion of the transferring motions of the previous course. The arms 32 then lift the fingers 33 clear of the stnds by which they were last engaged, and bring them down into the position determined by the new studs. The large-tooth ratchet also carries a pattern wheel for selecting the thread carriers. A. sliding arm 59, Fig. 3, on the semicircular shaft 60 can then engage one or other of forked driving-pieces 58 on the carrier rods 55, 56. To accomplish this, the shaft 60 is rocked by a link jointed to a lever carrying a truck running on a flat end of a pattern-lever arm, provided with a pivoted finger for engaging the pattern studs.