Patent GB-190726166-A (GB)
Title: Improvements in and relating to Scallop Embroidery Sewing Machines.
Inventor: PARKES WILLIAM NELSON
Filed: 1907-11-26
Granted: 1908-09-03
Abstract: 26,166. Parkes, W. N. Nov. 26. Ornamental - sewing machines; needle-bars, vibrating laterally; cords, applying; multiple-needle machines.-The machine is provided with a laterally-vibrating needle, and a looper similarly vibrated and oscillated to throw a loop of thread about the needle thread at each alternate stitch, the field of vibration of these parts being progressively changed for sewing scallops ; and also with a cording-lever which follows the needle in its progressive movements. The actuating-mechanisms are adjustable into and out of operation so as to produce a simple zigzag stitch or a scallop with plain sewing; and if two needles are attached to the needle-bar the looper can be arranged to throw its thread about both loopers. The needle 15 is mounted eccentrically upon the needle-bar 13, which is oscillated to produce the lateral vibration by a lever 42, Fig. 1, to the boss of which it is splined. The needle-bar is concentric with the rotary loop-taker 11. The looper 91 is carried by a shaft 81 mounted in the hollow presser-bar 83, moves in an arcuate recess in the presser-foot, and is oscillated by means of a lever 80, Fig. 2. The presser-foot is also provided with a long curved slot for the passage of the needle. The cording-lever 119 is provided with a spring- pressed foot 125 through a perforation in which the filling is guided. Both the looper 91 and the cording-foot 125 may be lifted by the presser. The levers 42, 80 are connected by adjustable pitmans to slotted segments 34, 75 mounted on opposite ends of one shaft 30, which is vibrated by a cam acting upon the walls of a box 33 to which the lever 31 on the shaft 30 is pivoted. To alter the field of vibration of the needle, the pitman 38, instead of being pivoted to the quadrant 30, is attached to a lever 36 which rocks on a pivot adjustable in the quadrant, and the lever 36 is connected to a slowly vibrating lever 48. For the same purpose, the pitman operating the looper lever 80 is formed in two parts hinged together at 78<b> so so as to form a toggle, which is raised or lowered by connexion with the lever 67 mounted on the same shaft as the lever 48. The levers 48, 67 are oscillated by a slide 53, which engages the forked tail of the lever 48 and is reciprocated by a camgroove 58 in a disk, which is rotated by the cam box 33 through ratchet gearing 62, 63, 64, the slotted lever 66, and the lever 27 on the shaft 29. The cording-lever, which is pivoted at 118, is also linked to the lever 48 by the parts 109, 108, 110, so as to receive the same motion. Figs. 18, 20, 21, and 22 show examples of the stitching produced by the machine. In that shown in Fig. 18, the tension of the looper thread 129 has been increased to pull the needle thread around it. Fig. 20 shows a scallop sewn without the needle being vibrated laterally. Fig. 21 shows a scallop with two rows of zigzag stitching, produced by two needles held by one holder, having a purl produced on one edge by the looper thread and with a filling 130. Fig. 22 shows a scallop formed with threads from two needles which do not vibrate, a looper thread 129, and a filling.