Patent GB-829363-A (GB)
Title: Running stitch machine
IPC: D05B85/00
Filed: 1957-02-11
Abstract: 829,363. Sewing-machines. AMERICAN MACHINE & FOUNDRY CO. Feb. 11 ,1957 [March 15, 1956], No. 4566/57. Glass 112. Machines employing double pointed needles. A running stitch machine producing a patterned stitching effect has mechanism for displaying its upper feed foot and lower feed dog, its throat plate and a presser foot to joggle its work laterally relative to the general, longitudinal, line of work feed and mechanism for selectively varying the individual stitch lengths. Feeding work, presser feet. The upper feed foot 90 (Fig. 1) is carried on a lever 344 pivoted for lateral movement to a swingable rod 276 reciprocated vertically by a crank mechanism and laterally by a toe 400 in synchronism with the stitching mechanism to provide a longitudinal work feed. The presser bar 278 carries a first presser foot 280 and a pivoted arm 284 (Fig. 12) to which is attached a second presser foot 282 which carries a displaceable material guide. A selected one of a bank of concentric pattern cams 238 (Fig. 5) carried on a shaft 246 driven by the stitching mechanism drive, actuates a follower arm 320 rocking the lever 294 and hence displaces laterally, through link 292 the second presser foot and the upper feed foot, and through links 302 and 312 the throat plate 108, which is provided with two laterally spaced needle holes. The follower arm 320 is manually slidable on its pivot rod 322 to permit its co-operation with any selected cam. The lower feed dog 92 is fixed to a rod 96 slidably engaged for lateral movement in the feed bar 100 and the rod is actuated through members 362, 360, 306 and 302 (Figs. 3 and 5) by the lever 294 to move laterally with the throat plate, presser foot and feed foot. Longitudinal feed is effected by the dog's motion contributed by the feed bar 100 which receives its vertical motion from a link 122 (Fig. 1) and a bell-crank lever 116 freely pivoted on a shaft 118, one arm of the lever being oscillated by a cam 112 driven by the stitching mechanism drive, horizontal motion of the feed bar being derived from a bell-crank lever 150, one arm of which is pivoted at 151 to the upper end of a member 152, the lower end of which has a yoke 154 embracing a crank pin 158 on the cam 112. A stub shaft 155 secured to the member 152 intermediate its ends is slidingly engaged with a slotted block 161 carried by the shaft 118. The amplitude of the vertical movement of the upper end of member 152, and hence of the horizontal motion of the feed bar, is dependent on the inclination of the slot in the block 161, this being varied by a selected one of a second bank of cams 226 also mounted on shaft 246. A follower arm 208 manually adjustable on its pivot shaft 212 to co-operate with a selected cam is connected by a yieldable link 202 to a crank pin 164 on a crank attached to the shaft 118. Further variation of the stitch pattern formed by a selected cam of the second bank is achieved by stirrup rods 169 and 173, Fig. 5, which encircle the crank pin 164 and are selectively positioned by index heads 184, 186 to limit the movement of the crank and hence the lengths of the over and under portions of each stitch. U.S.A. Specifications 2,368,066, 2,386,800 and 2,604,863 are referred to.