Patent GB-190320906-A (GB)
Title: Improvements in and relating to Sewing Machines
Filed: 1903-09-29
Granted: 1904-01-21
Abstract: 20,906. Lake, H. H., [National Machine Co.]. Sept. 29. Buttonhole-sewing machines ; buttonholes, barring ; buttonholes, cutting ; feed; needle-bars, vibrating laterally ; stopping-gear.-Relates particularly to buttonhole-sewing machines and consists, first, in providing mechanism for producing jogging movements of the needle in side stitching upon both sides of the buttonhole and barring stitching at the ends, by the operation of a single guide vibrating through a fixed path, and without necessary lateral movement of the work, the work being only given a feeding movement longitudinally of the buttonhole, and, secondly, in means operated by the stop mechanism of the machine for rendering the 'cutter-tripping mechanism inoperative so that the cutter cannot descend at a wrong point during the manual operation of the work feed which takes place for example when a thread breaks. Fig. 1 shows a front elevation, Fig. 5 a rear elevation, and Fig. 6 a top view. The connecting-bar 4, by which the needlebar gate is oscillated, is pivoted to a pin 5 mounted in and arranged to slide along a guide 6 consisting of two members 7, 8, of which the former is pivoted at 9 to a supporting-plate 10 and at 11 to the member 8, which has also a slotted connection with a stationary pivot 12 on the plate 10 which is itself pivotally supported on an axis of rotation 13 fixed relatively to the arm 2 of the machine, and the plate 10 is secured in its adjusted position by screws 14, this adjustment serving to adapt the machine for sewing different classes of buttonhole. The guide 6 is vibrated by a link 20 adjustable in a lever 18 mounted on a rock-shaft 19 and having a rearwardlyprojecting pin which is engaged by a cam 15, Fig. 6, driven from the horizontal driveshaft 17. A vertical rod 21 is connected at its upper end with the pin 5, and at its lower end to a lever 22 which is operated by a cam 24 which controls the movements of the pin 5 up and down the guide 6. The cam 24 is driven by gearing connected with ratchet-wheels 33, 34, the pawls of which are driven from the shaft 17. The cam 24 is rigidly secured to a shaft 40 which carries the feed-disc 41 which by means of a connecting-rod 42 transmits a gradual reciprocating movement to the work-clamp 43 during the side stitching, and keeps it at rest during the barring. A hand-piece 45 can move the disc 41 so as to allow of the work-clamp being manually operated. The movements of the guide 6 and the varying positions of the pin 5 in the guide 6 due to the cam 24 cause the necessary jogging movements to be imparted to the needle. Automatic means may be employed to stop the machine so that the work may be shifted for the making of a new buttonhole. This is effected by a spring-actuated bar 49 arranged to operate a brake arm 50 but held out of operative position by a detent 51 until the latter is moved away by a pin 53 on the underside of the disc 41. With regard to the second part of the invention, the cutter 59 is operated by wellknown mechanism, and, in addition, a detent 68 is provided which is connected with the brake arm 50 so that when the latter is operated to stop the machine the detent 68 is moved into position beneath a projection 69 carried by the cuttercontroller bar 61 which is thereby held at rest until the brake is taken -off.