Patent GB-688596-A (GB)
Abstract: 688,596. Sewing machines. UNIVERSAL WINDING CO. May 2, 1951 [May 9, 1950], No. 10289/51. Class 112. Running-stitch machines.-A machine for forming lacing on the edge of work comprises an arcuate needle carried on a drum with means for positively driving the needle, a drum on which the lacing is wound, and means for stripping individual turns of the lacing from the latter drum. In the form shown, a needle 20, Fig. 4, extending over more than a full circle, lies in a helical groove in a drum 98 mounted in a bearing in a fixed plate 60 and driven through a hollow shaft 56. A second drum 72 to receive the turns of lacing 30 following the needle is mounted in a bearing in the drum 98 and is driven by a hollow shaft 66 from the same motor as the drum 98 but somewhat faster; this drum is slightly tapered, and has a central bearing for a fixed rod 68 which carries an end-plate 78. Bolts 86 extending from the plate 60 carry rollers 84 which hold the needle on the drum 98 and are eccentrically mounted on the bolts for adustment; the bolts 84 also carry segments 88, 90, 92, Fig. 3, of a guide which fits round the greater part of the drum 72 with just enough clearance for one layer of lacing, the segment 90 being pivoted to 88. , On approaching the edge of the work support 8, the needle and lacing are lifted from the drums by a plate 105 to pass over a guide member 16 (which can be withdrawn axially when a curved edge or corner of work is to be dealt with) and through the edge of the work, returning to the drums over a plate 107; during this deflection from the drums the lacing is held against the deflecting plates by spring plates 126, 128 and the needle is guided by plates 106, 108 and between the turns of worms 116, 124 driven by gearing from the shaft 56 so as always to register with the needle groove in the drum 98. The point of the needle is lifted, to ensure that it passes over the plate 105, by a pin actuated by a resilient arm fixed inside the drum 98 and engaging a cam fixed on the disc 60 at the proper time. The needle is moved positively with the drum 98 by two fingers mounted on spring-biassed levers 142 within the drum and projecting through its periphery to engage slots in the needle; the levers run round a cam hub on the plate 60 so that the respective fingers are withdrawn from the needle before it is lifted from the drum on approaching the workengaging position. The ring segment 92, which is adjustably mounted on the plate 60 by brackets 91, carries means for stripping from the drum 72 one turn of the lacing, comprising a member 190, wth a roller 194 fitting against the face of the drum 72, connected to a spring- retracted member sliding in a guide 168 on the segment 92; the outermost turn of the lacing enters between the roller 194 and a ledge on the member 190, and as the lacing is tightened by the pull of the work it draws the member 190 out of its guide until it can tilt outwardly against a leaf spring 198 and free that turn of lacing. Members 206, also tiltable outwards against spring pressure to release the lacing freed by the first-mentioned device, are also carried in housings 202 on the ring segment 92.