Patent GB-190816577-A (GB)
Title: Improvements in or relating to Sewing Machines.
Filed: 1908-08-06
Granted: 1909-11-08
Abstract: 16,577. Jerram, A. E., Pearson, M. H., Goddard, J. W., and British United Shoe Machinery Co. Aug. 6. Lock-stitch shuttle sewing - machines.- A shuttle is mounted À to oscillate in a circular race in a plane parallel to the eye o f t h e machine needle. The needlethread loop thrown out by the needle in the usual way is deflected into the path of the shuttle by a hook reciprocated across the path of the shuttle. The shuttle may be of the disk type as shown in Figs. 9 and 10. Theshuttle driver engages walls D<5>, D<7> of a gap cut in the shuttle disk. A spool case D' is located in a hole cut in the disk, and is pivoted at D<3>, on one side of the centre of the disk so that when rotating centrifugal force may tend to hold the spool case in place. The spool case is locked in place by a pin Z<3>. The shuttle thread is tensioned by passing it under a plate Z<6> hinged at D<3> and pressed upon by a spring Z<9>. The shuttle-driver-shaft H', Fig. 5, has a lever arm H<2> at its rear end, and is oscillated by the connexion of that arm with a cam-lever H<5>. The connecting-link H<3> is pivoted to the lever H<5>, slides in a pivoted block H<4>, and is slidingly connected with the arm H<2>. Needle shields.-A projection on the shuttle driver engages with the needle from the rear when the latter is bent towards the front of the machine, and presses it forwards into its correct position. This needle-straightener may be arranged to move in whatever direction the needle is bent, and may be mounted independently of the shuttle. Feed by needle. The needle-bar reciprocates in a frame carried at its lower end by a spindle slidingly mounted in the machine head and guided at its upper end by a sliding connexion with the machine head. The spindle, and with it the needlebar, is vibrated across the head of the machine by connexion with a lever on a feed-shaft J, Fig. 5. The feed-shaft operating-lever J<3> is linked by a piece L<2> to a cam-bowl L running in a camgroove. The cam-bowl is anchored by a swinging link L<1> which is pivoted on a plate L<4>. To vary the feed, the plate L<4> is moved about its pivot A<7>, which is concentric with the average position of the cam-bowl L, to alter the angle that the line of the motion of the cam-bowl (as determined by the swinging link) makes with the centre line of the link L<2>. The needle is assisted in feeding by a plate, carried by a sleeve surrounding the shuttledriver shaft the rear end K<1> of which is shown in Fig. 5. The sleeve carries a lever-arm K<2> which is linked to the lever-arm J<3> of the feed-shaft, and accordingly the feed-assisting plate comes into contact with the needle below the work and moves positively with it during the feed. The needlestraightener may co-operate with the feed-assisting plate in moving the needle. Needle-driving ; presser, lifted automatically; governing needle thread.-The needle-driving mechanism is described in Specification No. 24,489, A.D. 1909 ; and the presser mechanism and needlethread handling-devices are described in Specification No. 24,267, A.D. 1909.