Patent GB-1356545-A (GB)
Title: Weaving machine for manufacturing a partly woven and partly knitted textile fabric
IPC: D03D41/00
Filed: 1971-03-23
Abstract: 1356545 Weaving; woven fabrics STATNI VYZKUMNY USTAV TEXTILNI 23 March 1972 [23 April 1971 14 Jan 1972 19 Jan 1972] 13611/72 Headings D1E and D1K A loom, wherein between groups of warps which form sheds there are mounted knitting needles, has weft guides which move across a group of warps laying a weft which engages the knitting needle at the side of the warps and is moved back before the shed is changed, the knitting needle drawing the loop through a loop previously formed by a weft crossing the adjacent group of warps. At the formation of the next shed, the guide moves again in the same direction or in the opposite direction. The let off from warp and weft beams 12, 17 is either negative by braking means or positive by a let-off motion. The lower driven loom shaft 28 carries shed-forming cams 29, 30 which co-operate with followers 31 pivoted on lifting leaves 32, 33 connected by members 34 to heald frames 14, 15. Shaft 28 also drives a cam shaft 37 which through connecting rod 38 gives a reciprocatory swinging movement to a pivoted sley 39 with a reed 40. Lapping guides 43 mounted for simultaneous reciprocatory oscillation about axis 44 each comprise a stem 45 carrying a weft thread guide 47. The movement is imparted to teeth on the lower ends of guides 43 which are engaged by a rack 49 which reciprocates in cross-bar 42 by cam 51 on cam shaft 37. On each shed exchange, as sley 39 is in its rear rest position guides 43 are moved. Between dents 53 of reed 40 there are, at intervals, wider spaces 54 for the passage of the guides 43 when in their intermediate position with their eyelets pointing to the apex of the shed. Opposite each guide is a latch knitting needle 56 and these are secured to a movable holder 57 having a sleeve 58 which encircles a cam 59 on a shaft 60 driven from shaft 37 so that the needles move in a path 65 once per rotation of shaft 37. In operation, levers 32, 33 are moved oppositely so that within each revolution of shaft 28, frames 14, 15 will form a plain weave shed from threads 3. During each revolution of shaft 37, sley 39 is moved from its foremost to its rearmost position when rack 49 will be displaced to move guides 43 from position I to position II across the needles which are then moved to their rearmost position, having caught weft threads 1 in their hooks to draw the weft thread through the previous loop 5 and form a new loop 5 whereafter guides 43 return to position I. The sley 39 returns to beat up position and the needles 56 with stitches 5 are returned to their foremost position so that reed 40 beats up the second weft formed by the loop 4. During the next shed the process is repeated but guides 43 move from position I to position III. The selvage loops 5' are not knitted through other loops and the marginal guides only swing in one direction so that they .use less thread and must be fed from separately braked packages. The yarn may be laid to form closed loops 5 instead of the open loops. In another arrangement, Fig. 11, a shed of a more acute angle may be used with lapping guides 43a shaped from a wire blank of flat or circular cross section with a stem 45a pivoted in bearings in a cross-bar 42a a free lapping arm 46a with an open eyelet 47a and opposite it with respect to the wire a bent part 48a with meshes with a rack 49a. In view of the arrangement of iron-bar 42a, the reed 40a is angular lying in two planes 72, 73 at an angle of about 100‹. In another arrangement, Fig. 15, lapping guides 43b formed from a flattened wire blank terminate at one end in an eyelet 47b and have at the other end a tooth 48b which meshes with a rack 49b. To reduce the curvature of the needle path the lapping guides 43c Fig. 17 are not perpendicular to the plane 31 bisecting the shed but are at an angle of between 25‹ and 45‹ and preferably 30‹ to the normal to plane 3'. The needles 56 slide in grooves in a bed 81. In a further arrangement, Fig. 19, cross bar 42d is the beam of sley 39d and carries the guides 43d in openings 85 and arms 46d forming the reed. Holder 57 carrying needles 56 is reciprocated by a connecting rod from a cam mechanism. It is also possible for the lapping guides to swing at each exchange into the same lapping position, to produce the fabric of Figs. 23 or 29, or the guides may be positioned intermediately of two needles, to produce the fabric of Fig. 28. Knocking over of the stitches on the knitting needles may be by a thin steel blade 100, Fig. 37, or by the edge of the bed 81, Fig. 17.