Patent GB-430207-A (GB)
Title: Improvements in sewing machine and method of sewing
IPC: D05B3/18
Filed: 1934-06-02
Abstract: 430,207. Sewing-machines. ROSEMAN, L., 16, Johnson Avenue, Newark, New Jersey, U.S.A. June 2, 1934, No. 16512. Convention date, June 5, 1933. [Class 112] Ring-like rows of stitches are produced in two- or more ply tape to secure snap-fastener elements in rows by a combined needle vibratory and feed movement. The necessary feed movement is imparted by mechanism working on a relatively loose section of fabric clamped between holders. The fastener elements may be held merely by the circular row of stitches or may have perforations in which anchoring stitches are placed. The tape is fed into the machine beneath the punch plunger 58 with the die 55 between the plies of the tape, the extremity of the tape being threaded through the pull levers 30, 31, and inserted between the feed rollers 4, 5 so that the pull levers ensure an amount of tape between the holding lever 25 and the feed rollers in excess of the straight line distance to allow the tape to be moved by the pull levers back and forth beneath the needle to a distance equal to the diameter of the circular row of stitches. When the machine is started, the feed rollers move the tape in one direction and the needle bar is reciprocated without moving laterally to form the straight row of stitches 1, Figs. 7 and 10. After the predetermined number of these stitches has been formed, e.g. twelve, the feed rollers are stopped whereupon the needle bar is jogged laterally to the tape so as to form a lateral stitch 13<a>, Fig. 7. Slightly before or simultaneously with this operation, the holding lever 25 is operated to clamp the tape against further movement. As this stitch is completed, the surplus work between the pull levers 30, 31 is moved longitudinally by a cam operating the pinion and rack 40, 41, reciprocating bar 35, cams 34, push rods 33 and pull levers 30, 31. The needle continues to move laterally so that the stitches 14<a> to 17<a> are formed. The movement of the work is then reversed to form the stitches 18a to 25<a>, the direction of movement of the needle reversing after the formation of the stitches 21a. After formation of the stitch 25<a>, the direction of the work is again reversed so as to form the stitches 26<a> to 29<a> whereupon the movement of the tape is stopped by a concentric dwell portion of the operating cam passing under the roller on the rack bar 42. Lateral movement of the needle continues to form the stitch 30<a>. The lever 25 is then released from the work and the feed rollers 4, 5 are started again to form another row of lateral stitches till the next fastener element is reached when the circular stitching is again commenced. During the formation of the stitches 26<a> to 29a, the lever 46 is actuated to pull a supply of tape from the supply roll ready for the next movement of the feed rollers. Between the movement of the tape by the feed rollers, the punch 58, 55 is operated to perforate the tape for protrusion of the heads or sockets of the fastener elements. For making the anchoring stitches when the fastener elements are perforated for this purpose, the cams 34, Fig. 21 are modified by having a projection 79, Fig. 21. By modifying the directional changes of the work, various shapes of stitching can be made. The needle bar bracket G is oscillated for jogging the needle by a cam wheel H driven by a worm K on a shaft D. The cam has projections h engaging a follower L carried by a lever M connected by a link O to the bracket G. The fastener elements are fed into the punched tape just in advance of the needle so that the heads or sockets register with the punched holes, by any suitable means. The clamp 25 is operated periodically by the roller 27 and cam 28, Fig. 1.