Patent GB-190525547-A (GB)
Title: Sewing Machine for Producing Scalloped Tucks.
Inventor: FAIRWEATHER WALLACE
Filed: 1905-12-08
Granted: 1906-12-06
Abstract: 25,547. Fairweather, W., [Singer Manufacturing Co.]. Dec. 8. Sewing-machine folding-attachments.-Relates to a machine for producing scalloped edges of the form known as "shell " tucking in which three ordinary stitches d, Fig. 10, are made through the folded material followed by an overedge side stitch at the crowdedup portion c at the base of the scalloping. The material is crowded up at c by a lateral "pusher" 33, Figs. 4, 10, and 11, working in connexion with the presser-feet. Fig. 10 shows the machine fitted with a tucking-guide comprising an adjustable base-plate 78, a plate 84 of a tucking- attachment over the edge of which the material is folded, and a tuck-gauging blade 81 adjustable by means of the slot 83 and screw 82. Cords, applying.-The plate 78, Fig. 10, is fitted with a cord-guiding eye 85 through which the cord b is led to the needle to be stitched to the work by the overedge stitches at c. Feed.-The feed-dog 11, Fig. 3, is mounted on a link 13 which is supported on a lever 17 oscillated vertically from an eccentric and link 18 on the main shaft 6. The feed-motion is obtained from a rocking shaft 26, to which is connected a lever 28 engaging the feed eccentric on the main shaft by means of a yoke. The end of the lever 28 beyond the yoke works in an inclined groove in a lever which can be adjusted to alter the inclination of the groove and thereby vary the feed. After three ordinary stitches have been made, the lever 17 and the feed-dog 11 are lowered to arrest the feed, in order to enable the overedge stitch to be made, by means of the pivoted lever 20, to which the lever 17 is connected by a link, as shown. The lever 20 receives motion from a cam-groove 24 in the side of the gear-wheel 42, Figs. 3 and 11, which is geared to the main shaft to rotate once for every four stitches. The fourth stitch is the ovoredge stitch. Presser feet work-supports; overedge-stitching.- The presser-foot 10, Figs. 3, 10, and 13, is provided with a central needle slot 71 and two side slots 72, Fig. 3, and co-operates with a work clamp 50, Figs. 4 and 10, having prongs 51 adapted to pass through the slots 72 to bear on and fix the work intermittently. When the clamp 50 is in action, the part of the material between the prongs is crowded up into a recess 73, Fig. 14, under the presser-foot 10 by means of the "pusher" 33, which works forward in the central slot 71. The nose of the pusher is slotted for the passage of the needle over the edge of the material. The pusher is actuated every fourth stitch from the slot-cam 41, Fig. 11, operating through a connecting-member 39 and giving a longitudinal motion to a shaft 38 which is fitted with a member 37 carrying a bracket 36 to which the pusher 33 is fixed. The clamp 50 is pivoted on a fixed bracket 56, Fig. 4, and is yieldingly pressed down by a spring 59 on a pin 57 carried by a pivoted plate 54 below the clamp 50. As the pusher moves forward, the clamp is pressed upon the work by means of the wedgeshaped end 65, Figs. 4, 9, and 11, of a pawl 66 carried by the member 37, the wedge 65 acting upon a pin on the plate 54. For the first part of the movement, the pawl rests on the feed-actuating link 18, but as this link moves downwards the pawl is supported later by a pin 68, Fig. 4, fixed in the frame, on to which the recessed part 69, Fig. 9, of the pawl moves. A pin 74, Fig. 11, on the clamp 50 rests on the presser-foot so that the clamp is raised with the presser-foot when the work is inserted. To ensure the proper action of the lateral pusher, the work plate and the presser-foot are stepped as shown in Fig. 15, so that the pusher will be unable to get under the work and cause the clogging of the machine.