Patent GB-191209458-A (GB)
Title: Buttonhole Stitching Machine.
Inventor: FAIRWEATHER WALLACE
IPC: D05B73/12
Filed: 1912-04-22
Granted: 1913-05-22
Abstract: 9458. Fairweather, W., [Singer Manufacturing Co.]. April 22. Button - hole sewing- machines. - Relates to machines having rotary stitch-forming mechan. ism for sewing radiating stitches round the button-hole eye, and consists in the provision of means for determining the arrest of the stitch-forming mechanism, an element of the means being adjustable to permit of a variation in the number of barring stitches and simultaneously a variation in the timing of the stitch-forming mechanism to the initial position. The turning-mechanism for stitch-forming devices, together with the needle-actuating means, are similar to those described in Specification 424/10, the stitch-forming devices being actuated from a cam 188 which has also, on its upper face grooves 210, 211 from which the work holder is actuated longitudinally and laterally, an adjustable step-by-step motion being given to the cam by connexions from a cam 190 on the main shaft 9. The groove 210 is entered by a stud 212 on a slotted pivoted lever 213, to which is adjustably connected a lever 217 connected to the main work-clamp slide 219. The groove 211 is entered by the roller of a stud 223 on a vertically-sliding bolt 224 in a socket 225 on the side-shaft lever 226 connected to the cross-slide plate 231. A latch 312 normally holds the bolt 224 down against its spring 308, and during the first side-stitching a lug 288<Î> is held over the bolt-head by a roller 284<Î> on an arm of the slide-bar 181 which enters a camslot 285<Î> in the lug-carrying lever. The bolt 224 has a pin 306 which when the bolt is raised, is received between the rings of a socket 304 on a pivoted clamp-jogging lever 294, the upper arm of which has a slotted segmental portion 295 in which works the head of an adjustable bolt 297 provided with an eccentric portion embraced by the lower end of a link 300 operated from a rocking-member 132 on the needle-shaft 13. The cam-wheel 188 has a tripping stud 316 which disengages the latch at the end of the side-stitching. The roller-stud 223 is thus released from the cam-wheel and the pin 306 enters the socket 304. The clamp-jogging lever then jogs the side-shift lever to operate the work holder in opposition to the needle to form the bar stitches. For timing the initiation of the barring stitches, either the stud 316 or the tripping-plate on the latch 312, may be adjustable. During the stitching of the eye, the lug 288<Î> is raised to allow of the movement of the stud 224 on the completion of the second side. The machine is stopped after the barring by the engagement of a lug 356 on the disk 188 with a trip lever 350, and the stitch-forming mechanism returned to its initial position, as described in Specification 2646/13. The lug 288<Î> is thereby depressed to return the bolt 224 to its lower position, where it is held by the latch 312, an enlargement 211<Î> being provided in the groove 211 to ensure free entrance. Either the nose-piece 351 on the lever 350, or the stud 356 may be adjustable to vary the number of barring stitches. An unbarred button-hole may be made by adjusting the stopping-means to act before the barring-mechanism.