Patent GB-189922013-A (GB)
Title: Improvements in Rotary or Straight-bar Knitting Machines.
Inventor: ALDRIDGE CHARLES HENRY
Filed: 1899-11-03
Granted: 1900-10-13
Abstract: 22,013. Aldridge, C. H. Nov. 3. Straight-bar knitting-machines.-Relates to means for shifting the transferrer bars in making lace or openwork, markings, tuckwork, &c. on Cotton's or other rotary machines, and also to a tension device. The bar B, on which the coverer points are carried, is connected to a slide B<3>, which is pulled by a spring B<9> up to one arm B<6> of a bell-crank lever, the other arm B' of which has a broad plate B<11> having a stepped lower edge. A special broad pattern-wheel has across its rim a number of grooves c<3>, in each of which is fixed, at any point of its width, a pin C<4>. As the pattern-wheel is rotated by its ratchet in the usual way, a pin C<4> acts on one or other of the steps on the piece B<11>, and so moves the point bar B that its points come opposite the proper needles. After each selection, the lever B<7> is raised by a connecting-rod B<12> and suitable cams to allow an undisturbed rotation of the cam-wheel. The pins C<4> are wide enough to be in action during two motions of the pawl C<5>; in the first motion the coverer points are moved to the proper needles, and in the second the raised part shogs the points to right or left. The studs C<4> may be of various heights, to give a greater variety of pattern, and may act directly on the slide B<3> instead of the bell crank. In the case of tuck work, the fingers on the bar B hold the needles from the presser. In a modification, the pins C<4> are adjustable in radial slots on one or both faces of the pattern-wheel, and they act on a plain plate corresponding to the stepped plate B<11>. The pins on one face form the bracelet or heading of a pattern, and those on the other the repeat part ; the plate B<11> is moved so as to engage with one or other set. In another modification, Fig. 5, the position of the bar B is regulated by stop levers F<3> pivoted at F<2> and acted on by studs F<6>, F<7> on a pattern chain ; the slide, on which is a stop piece F<4>, is moved to the left before each selection by a bell crank G and suitable cams to allow the next lever F<3> to come into position unobstructed. The levers F<3> are pivoted at F<2> on a slide F, which is moved to the left or right to shog the points by means of a pair of sector cams H<2>, which act on a bowl F<12> and which are raised into action by means of a forked rod H<8>. According as a high or low stud F' or F<6> comes under the lever F<5>, the part H<10> or H<9> comes under the stud H<11>, and the appropriate cam H<2> comes into action and so the bar B is shogged to right or left. The ends of each lever F<3>, F<5> may be stepped to give a greater variety of positions to the bar B, but in this case the bar is shogged after selection by an independent lever. Either of a pair of chains on separate wheels, or either of two sets of lugs on one chain, may be brought into range of-the-levers F<5> to produce the bracelet or heading and the repeat pattern. In order to move some points to right and some to left at the same motion, two point bars L, B, Fig. 9, are used, the points L<4> on one bar being bent so as to be situated in the same plane as the points L<3> on the other ; one bar L is shogged to the right, and the other B to the left, by the arrangements described above. In place of using an adjustable spring snapper as usual, the thread M', Fig. 11, is passed through the bar M', and is gripped between it and the lower side of the arm M<3>, which is provided with adjustable weights M<5> ; as the arm M' rocks, the tension depends on the weights M<5> ; the distance between M' and M<3> may be regulated by a set-screw M‹.