Patent GB-133647-A (GB)
IPC: B29D30/38
Abstract: 133,647. Ingham, E. June 16, 1919. Fashioned fabrics, looms specially designed for; shuttleless looms; circular looms; selvedges, protecting. - A loom for weaving curved fabrics such as pneumatic tyre casings comprises a curved form around which the warp threads are supported, means for forming the sheds, and a curved needle arranged to lay the weft in the sheds by oscillatory movements and to beat up the wefts by axial movements. The warps 18, Fig. 1, pass from reels 16, through pairs of holes in a tension ring 17, and through a spreader 19 to eyes in healds 22 which consist of radially disposed rods or wires with their outer ends sliding freely in holes in a ring 21. The healds are arranged in two planes and have their inner ends set in segment-shaped blocks 24, Fig. 5, which are pivoted in pairs to the ends of double cranks 26 on shafts 27 each provided with a pinion 28 gearing with an internally-toothed wheel 31 secured to a plate 32 with an attached lever 34. This lever is oscillated in one direction by a pin 35 thereon being struck by an arm 38 on a gear wheel 39 in mesh with a gear wheel 42 on the loom driving-shaft 4, and in the other direction by the pin 35 being struck by a lever 36 itself acted upon by a pin 41 on the wheel 39 diametrically opposite the arm 38, so that the shafts 27 are rotated half a revolution alternately in opposite directions and the cranks 26 move the healds outwards and inwards to shed the warps. The heald mechanism is loosely mounted around a sleeve 14 on a shaft 11 which carries the weftinserting needle 52 and is rotated alternately in opposite directions to actuate the needle by bevel wheels 10, 9, 8 and mutilated bevel wheels 6, 7 on the shaft 4. The needle 52, Fig, 13, comprises a wide cylindrical part supported by an arm 55 on a boss 53 splined to slide on but rotate with the shaft 11. The edge 52<a> is thinner than the opposite edge and the end 57 is wedgeshaped to enter the shed easily, the warps passing through a gap 58. The weft from a stationary supply 65 is guided to a hole in the boss 53 and passes out through a hole 62 to a groove 61 in the outer surface of the needle and thence through an eye 60 in a projection 59 to the fabric. The weft loops 74, Fig. 7, are caught at the selvedges by pivoted hooks 72 operated through toggle levers 70 and a spring-controlled plunger 68 from a cam 66 on the shaft 4. The wefts are beaten up by axial movement of the needle 52 produced against the action of a spring by a spider 15, which has four or more thin radial arms and is mounted on the sleeve 14. This sleeve is moved to and fro along the shaft 11 by a pin 43 and slotted lever 45 operated by a bowl thereon engaging a face cam 48 on the shaft 4 under the influence of a spring 50. The fabric is woven around a curved frame or ring 13 and is supported as it leaves the frame by a shield 77 secured to the frame 13 and supported by a bracket 76 thereon. Within the shield is a movable form 78 similar in shape to the tyre for which the fabric is intended and supported on spokes 79 secured to a hub loose on a shaft 80, the plane of the needle being radial to this shaft. The loops at the selvedges of the fabric are engaged by pins or hooks 84 on the form 78 which is drawn downwards to tension the warps by a weight 83, attached by a strap 82 to a sector 81 carried by the spokes, and is also moved downwards by ratchet mechanism comprising a ratchetwheel 89, with an integral rack-wheel 91 connected by a hand-operated latch 92 to a spoke 79, and a pawl 88 pivoted on a lever 86 operated by a cam 85, a detent 90 preventing backward movement of the ratchet-wheel. The latch 92 may be released by a handle 94 and link 93 to reset the form 78 in its upper position, the shield 77 always bridging the gap between the form and the frame 13.