Patent GB-191328794-A (GB)
Title: Improvements in or relating to the Relative Positioning of the Work and the Tool or other Operating Means in Machines used in the Manufacture of Boots and Shoes.
IPC: A43D111/00
Filed: 1913-12-13
Granted: 1914-12-14
Abstract: 28,794. British United Shoe Machinery Co., [United Shoe Machinery Co.]. Dec. 13. B o o t - sole sewing machines; lasts, mounting; feed by clamps and the like.-In a machine in which a lasted boot is presented automatically to a sewing-machine or other operating-tool, special devices are provided to ensure that the turning movements of the last shall be about a vertical axis containing the stitching or other operating point. The invention is described in connexion with a sewing- machine of the type described in Specification 13,366/88 and having cam - operated devices associated with a channel guide for positively bringing the work into the correct vertical position for stitching, as described in Specification 7407/11. The last-carrier 6 is integral with a sleeve 7 pressed upward by a spring 15 and a lever 16, and revoluble within a frame 9 by means of sprocket gearing 20 on a central spindle 8 having a head 10, which is slotted to embrace an arm 11 of the last-carrier. The head 10 carries a plate 97 which passes between tongs 95, 96, Figs. 1 and 10, having revoluble jaws 98, and the jaws are closed on to the plate so as to provide for it and the lastcarrier a centre about which they must turn during the time when the turning movement, necessary to bring the line of the seam into the line of feed, is imparted to the last-carrier by the sprocket-wheel 20. A second and similar pair of tongs 105 is also described, which closes on to the plate 97 alternatively with the tongs 95, 96, and to this second pair there is given by a cam-lever a feeding movement corresponding to the feeding movement of the sewing- machine. A hand-lever is provided for opening the tongs, which are spring-closed, when it is necessary to adjust the last - carrier manually. The mechanism for imparting the turning movement to the last-carrier is controlled by a finger 23 mounted resiliently on a lever 24 which is pressed by a spring 33 into the sole channel at a point one-stitch length ahead of the stitching-point. If this point is not in the line of feed, the finger 23 is displaced from its central position, and the displacement is communicated by a pulley 32 and a wire belt to a pulley 34, and thence by a slide 40 and a link 41 to a roller 43 on a lever 42. The slide 40 and consequently the roller 43 are then locked in position by a clamp 83, and a lever 46 is raised by a cam, bringing the bifurcation 45 of a pivoted plate 44 up to the roller 43. The plate 44 is displaced according to the displacement of the roller and communicates its movement by a link 49, a lever 53, and a link 60 to the inner end of a pitman 55, and thereby moves the slide block carried by the pitman out of the central and ineffective position in a segmental slot of a cam-oscillated lever 57. On the next movement of the lever, the pitman is actuated to an extent dependent upon the displacement of its slide block and, by means of a slide 61, a link 62, a toothed lever, and a pinion, operates an element 66 of a clutch, from which the turning movement is communicated by chain - and - sprocket gearing to the last-carrier. The parts 49, 53, 60 are locked in position during these movements by means of a cam-actuated shoe 86 and a segmental extension 87 of the lever 53. When the lastcarrier is positioned, the clutch 66 is opened, and the lever 46 is lowered to bring the plate 44 into the fixed fork 91, by which the plate 44 is brought back to its central position and the other parts are correspondingly returned. During the feeding operation, the channel finger 23 is withdrawn from contact with the work by means of the cam that turns the lever 42. The invention is stated to be applicable to machines for sole-rounding or channelling partly completed boots, and for channelling, shouldering, and lip-turning operations on loose soles. The double-acting clutch comprises inner and outer elements 66, 67, Fig. 7, capable of being locked together for either direction of rotation by means of balls 74 and converging surfaces 76. The clutch is rendered inoperative by means of levers 78 having wedge heads which can be used to force the balls apart. The levers are pivoted to the element 67 and are operated by means of a central rod 80.