Patent GB-190116773-A (GB)
Title: An Improved Sewing Machine.
Inventor: SIMMONS FREDERICK
Filed: 1901-08-21
Granted: 1902-01-16
Abstract: 16,773. Simmons, F., and Burford, E. E. Aug. 21. Seams ; blind stitching machines ; chain-stitching machines. - The machine produces the stitch shown in Fig. 57, either as a blind-stitch, or, as shown, on both sides of the work. Fig. 2 shows an end view of the head, and Fig. 3 a rear view. The work is fed transversely across a rib 12, over which it is folded by a spoon-shaped plate 128 and a feed-dog 75. The needle, carried by a lever 18 pivoted at 19, moves horizontally, and obliquely to the ridge 12, passing through the work just above the ridge. The needle loop is seized by a hook 157 on a lever 147, and placed on a loop-retainer 135, shown in plan in Figs. 7 and 34. An oscillating hook 114<a> then engages the loop, which is pushed off the retainer 135 by a projection 134, and the hook 114<a> holds the loop in a position where the needle passes through it at the beginning of the next stitch. The hook 114<a> is pivoted to a plate 107 on the lower end of a lever 95, to which two cams impart vertical and horizontal motions. The lever is pivoted at its upper end in a similar position to the lever 18, but, by means of a screw and slot, its effective length can be altered. The hook 114<a> is oscillated from a cam lever carried in the frame 86, Fig. 3. The loop retainer 135 is reciprocated in a frame 122 secured to the machine arm, and the cast-off projection 134 is fixed to the frame 122. The hook-lever 147 is pivoted in the frame 122, and is oscillated by a rod reciprocated by a cam. This cam, and those for actuating the needle lever 18, feed-lever 57, and lover 95 are arranged side by side in the head of the machine. These cams may be peripheral, and act in conjunction with springs ; or face-cams, in which case springs are unnecessary. Work-supports.-The table, of which the ridge 12 forms part, slides vertically on a fixed arm 6, Fig. 15, and is vertically adjusted to suit the thickness of the work and the character of the stitch desired, by means of the screw 4 acting in opposition to a spring 7. The ridge may be made of graduated width, so that, by longitudinal adjustment of the table, the length of stitch can be varied ; or, for the same purpose, interchangeable strips 13, fitted immediately under the needle, may be used, the construction for the vertical adjustment being then simplified. Feed; presser-feet; presser lifted automatically.- The presser-foot 75, by which the work is fed, is carried on a lever 57, actuated in a similar manner to the lever 95, and also, like that lever, capable of vertical adjustment. Sliding in the presser-foot, Figs. 29 and 30, is a pin 79 carrying a plate 78 and pin 77, and reciprocated from a cam lever in the frame 86. The pin 77 is designed to rest on, and clamp, the root of the needle loop, when this loop is being pulled over the ridge 12 to be presented to the needle. In a modification, the pivot of the feed-lever is capable of adjustment in a slot in a swinging arm. In another modification, the cam levers in the frame 86 are replaced by a more direct connection between the cam and the pin 79 and hook 114<a> which they operate. The plate 128, which acts to some extent as a presser-foot, is carried by a slide 127 fitting in an oblique guideway in the frame 122 and pressed towards the work by a spring. Governing needle thread.-Fig. 24 shows an elevation of the tension device, secured to the back of the head. It comprises an angle plate having a slot in which a block 39 loosely fits. The thread passes through a hole 49 in the plate 36, then up over the block 39 to a lever 29, down through a hole 50 similar to 49, and between one side of the block 39 and a spring 46. The block 39 is pressed upwards by a spring 42 so as to grip the thread between its extension 40 and the angle plate. Gripping of the thread between the spring 46 and block 39 is normally prevented by the engagement of surfaces on these parts, which surfaces are inclined in such a way that, when the block 39 is depressed by the lever 29, to release the grip of the plate 40 on the thread, the spring 46 is allowed to grip the thread.