Patent GB-190904942-A (GB)
Title: Improvements in Sewing Machines.
Inventor: FAIRWEATHER WALLACE
IPC: D05B23/00
Filed: 1909-03-01
Granted: 1909-04-29
Abstract: 4942. Fairweather, W., [Singer Manufacturing Co.]. March 1. Hat - s e w i n g machines; frames; needles, driving; feed by wheels.-In a machine for sewing sweat-bands into hats, the needle-bar is mounted obliquely in the machine head, and is reciprocated by gearing which is periodically disconnected from the driving- shaft to permit several feeding movements between some of the stitches. The long and short stitches produced are shown in Fig. 13. The machine head 10 has a hub 98 which is pivoted in the arm 8 and can be rotated to remove the presser-foot &c. from the normal position. A spring- pressed block 108, Fig. 7, bears upon the reduced part 96 of the hub and frictionally holds the head when in operative position. The tapered end of a rod 140 enters a hole in the arm when the head is in operative position and locks it in place. The rod is withdrawn when the presser is lifted. The needle bar carries a pin 86, which is parallel with a crank - pin formed on the end of the shaft 56 and is connected to it by a link comprising two socket pieces 72, 74 hinged together at 76. An eccentric 40, Fig. 1, on the lower shaft, through a rod 38, oscillates a sleeve 48 mounted loosely on the shaft 56. A pin 268 is slidingly mounted in a block 264 secured to the shaft 56. The sleeve 48 is connected to the shaft 56 and so drives the needle-bar when the pin 268 is moved to engage in a corresponding hole in the sleeve. The pin 268 passes through an arcuate slot 256, Fig. 12, concentric with the shaft 56, in the upper end of a lever 242, and collars 270, 272 cause it to follow lateral movements of the lever 242 while being free to oscillate in the slot of the lever when coupled to the sleeve 48. The lever 242 is coupled at its lower end to a rod 254, the further end of which is pressed by a spring 286 upon a cam-surface on the feed-wheel 190. In the example shown, the cam-surface is formed to operate the rod so that in each cycle the needle bar is operated for two stitches and then is disconnected during four successive feeding movements. This produces stitches which are alternately separated by spaces equal to one and the sum of four feeding movements, respectively. The upper limit of the needle-bar movement is determined by a screw stop 328 and an arm 262 on the shaft 56. When the shaft is disconnected, the arm 262 is kept in contact with the screw stop by a screw 322 in the oscillating sleeve 48, which contacts at the end of its oscillation with a screw 326 in the shaft 56. The feed-wheel 190, Fig. 3, is mounted in a raceway, and its inner bevelled edge is ratchettoothed for engagement with the driving-tooth 208 which is pivoted to an arm 210 of the feed rock-shaft. The raceway is pivoted at 194 and is adjustable about the pivot bv means of two screws 198, 200. A plate 228, Fig. 6, which is slotted to receive the outer edge of the wheel and is controlled by a spring 238, serves as a detent to the wheel. The cam-surfaces for operating the rod 254 are shown at 276. Presser-feet; governing needle thread.-The presser-bar is hollowed to receive the usual spring. It is kept from turning by an attached block, which is bifurcated to embrace the upper bushing carrying the needle-bar. A lug 160 removes the head locking bar 140, when the presser is lifted, by bearing upon an oblique shoulder 164. When the bar is withdrawn, a second shoulder on it rotates a tension-releasing lever 170. The take-up lever 188 is operated by a cam 186 on the lower shaft.