Patent GB-190814696-A (GB)
Title: Improvements in or relating to the Supporting and the Relative Positioning of the Work and the Tool in Machines used in the Manufacture of Boots and Shoes.
Filed: 1908-07-10
Granted: 1909-10-11
Abstract: 14,696. Keall, F. B., Gouldbourn, J., Jerram, A. E., and British United Shoe Machinery Co. July 10. Boot-sole sewing - machines. - Relates to soleedge finishing and trimming machines, solestitching or fastening machines, and other like machines, in which hydraulic or other mechanism produces relative movement between the jack and the tool to cause the tool to operate around the edge of a sole forward of the heel, and consists in the provision of adjustable means for varying at either end of the traversing movement, without affecting the other end of such movement, the point at which automatic reversal or termination of traverse occurs ; also of means to determine this point for different sides of the same shoe, and of means for interchanging these predetermined points for right and left shoes. The invention is described as applied to an edge-setting machine, in which the sole edge of a boot mounted on a jack B, Fig. 1, is subjected to rapid vibratory movements of a tool C. The jack and the tool are moved relatively by automatic mechanism to transfer the point of operation of the tool around the sole, and correcting-devices controlled by feelers U, S bearing upon the tread and edge of the sole respectively are arranged to impart relative angular movements between the jack and the tool to ensure that the tool is alway square with and bears evenly upon the sole edge. The jack B is mounted so as to be freely movable in a horizontal plane on a spindle D, Figs. 1 and 2, and is moved past the tool C in an approximately sole-shaped path by a cam D<6> fixed to the spindle D and engaged by two rollers E<1>, E' mounted on a pivoted lever E. At certain times, these rollers are moved by hydraulic mechanism controlled by the " edge " feelers to bring the path of movement of the jack into exact agreement with the contour of the sole. The cam D<6> is oscillated by two chains F<6>, F', Fig. 2, which pass over pulleys and are connected to a slide F coupled by a rod F<3> to the piston F<4> of an hydraulic cylinder F<5>. The supply of fluid to this cylinder during the operation of the machine is controlled by mechanism comprising a reversing-cam G secured to the jack spindle D, and coupled up by adjustable connexions to an oscillating valve which controls the direction of the fluid into the cylinder. These connexions are shown in Fig. 7, and include a clutch H<1>, H<3>, and two tappets H<7>, H<8> adapted to contact with stop-plates J<1>. As the cam G revolves, it moves a rod mounted within a central bore in a rod H<3> and throws the clutch into gear, causing the rod H<3> to rotate until one of the tappets engages with one of the stop plates. This arrests the movement of a friction sleeve H<5>, to which the hub H<6> of the tappets H<7>, H<8> is key ed, but the continued movement of the rod H<3> actuates through link connexions the oscillating valve of the hydraulic cylinder F<5> and changes the direction of the flow of fluid in it. The motion of the jack B is therefore reversed, and continues to be so until the other tappet engages the corresponding stop plate, when the original direction of motion of the jack is restored. A spring-toggle mechanism is provided to reverse the valve quickly. In order that the points of reversal of the jack may be varied on different sides of the shoe, the stop-plates J<1> are mounted so that they can be independently adjusted, while in order that, after operating upon a right shoe, the points of reversal may be shifted for a left shoe of the same style and size, without independent adjustment of each stop plate, each plate is provided with two portions a, b, Fig. 7, at different levels ; by sliding the hub H<6> along the sleeeve H<5> the tappets H<7>, B<8> can be moved to engage with either of these two portions of the stop - plates. The machine is also fitted with mechanism for maintaining a constant rate of travel of the tool with relation to the sole edge. This mechanism is more fully described in the companion Specification No. 22,502, A.D. 1909, while the method of mounting and actuating the tool C to keep it square with the sole edge is fully described in a second companion Specification No. 22,503, A.D. 1909. The tool C is yieldingly moved up to, the work by movement of a lever V, which movement is transmitted to the tool through the connexions shown in Fig. 1, and is held up to the work by a spring V<5>. Afterwards, a cam on the rock-shaft V<1> actuates connexions to free the admission valve of the hydraulic cylinder F<5>, which then. starts the traversing movement cf the jack. The lever V is locked in position while the machine is running by a tooth V<9>, Fig. 2, which engages an aperture in the machine frame. The jack makes a number of predetermined oscillations, which number can be adjusted, and the machine is then automatically stopped. For this purpose, the slide F, Fig. 2, carries a tappet F<20> adapted to engage a spring- pressed pivoted lever Q, which,is connected to an arm W<1> projecting from a rocking frame W. Another arm W<3> projects from this frame and carries a pawl W<4> adapted to engage a ratchetwheel W<5>, which carries an arm W<6> provided with a wedge portion W<7>. Each reciprocation of the slide F rotates the ratchet-wheel until, after it has been rotated through a predetermined amount, the wedge W<7> engages and depresses a spring-pressed plunger V<10>, which forces the tooth V<9> out of engagement with the machine frame, thereby freeing the starting-handle V so that the tool falls away from the work. After the machine is stopped, a spring returns the ratchet-wheel to its original position. To adjust the number of movements of the jack, the arm W<6> carrying the wedge W<7> is adjustable about the wheel W<5>.