Patent GB-900976-A (GB)
Title: Improvements in or relating to sewing machines suitable for use in sewing together an upper and sole member of a shoe
IPC: A43D15/00
Filed: 1957-09-04
Abstract: 900,976. Shoe manufacture; sewing-machines. BRITISH UNITED SHOE MACHINERY CO. Ltd. (United Shoe Machinery Corporation). Sept. 3, 1958 [Sept. 4, 1957], No. 27848/57. Addition to 811,605. Classes 17 (1) and 112 [Also in Group XXIV] Shoe-sole sewing, welt-cutting.-The machine shown in Figs. 1 to 26 of the parent Specification is modified to enable release of the starting treadle to effect the severing of the welt in addition to stopping the machine, when the latter is being operated to attach a welt to the forepart only of a shoe. For sewing a welt all around a shoe, the machine is operated in the manner described in the parent Specification, when the treadle is depressed to start the machine for attaching a welt 10 to an insole 6 and upper 8, and shortly before completion of the seam a knee-pad 88 is operated to rock a lever 64, whereby a feeler 14 is positioned adjacent the work, a stud 58 is positioned adjacent a switch 52 in the circuit of a solenoid 46, and a stud 90 closes a switch 92 in said circuit. The front end 12 of the welt finally engages the feeler 14 and thereby moves stud 58 to close switch 52, when solenoid 46 is energized to operate the welt-severing knife 16. In the machine described in the parent Specification, when attaching a welt to the forepart only, switch 52 is permanently closed by a cam-arm 96, whereby welt severing is effected by operating the knee-pad 88 to close switch 92. In the present machine a switch 98 is provided in parallel with switch 92 and a doublepole selector switch 100 is arranged for connecting either switch 92 or switch 98 in the circuit of solenoid 46. For all-around welt attaching, switch 100 bridges the terminals 55 to connect switch 92. For attaching the welt at the forepart only, switch 52 is permanently closed by arm 96 and switch 100 bridges the terminals BB to connect switch 98 and disconnect switch 92. The knee-pad 88 when operated does not effect operation of the knife 16, and is held in its inward position by the engagement of a pawl 79 with a pivoted latch bar 112. The latter is arranged to be released, when switch 98 is closed to operate knife 16 on release of the starting treadle, by the energization of a solenoid 120, a cam 130 on knife 16 rocking a lever 134 to close a switch 140 in the circuit of solenoid 120. An arm 148, pivoted at 149 to the knee lever 64, is connected by a link 146 to the starting treadle, whereby arm 148 moves downwardly when the treadle is depressed. Inward movement of the knee-pad 88 serves to position the cam-shaped inner end of arm 148 beneath a roller 150 on one arm of a lever 152, whereby, on release of the treadle for stopping the machine, arm 148 rooks lever 152 for closing switch 98 to operate the knife 16. Starting and stopping.-A bolt 40, vertically slidable in a horizontally slidable member 42, is connected by a link 158 to a lever 160 coupled by a link 168 to the starting treadle, whereby bolt 40 is drawn downwardly on depression of the latter. On release of the treadle, to disconnect a driving clutch, bolt 40 is moved upwardly by a spring 180 to enter a recess in a vibrating lever 38, whereby the machine is stopped in a predetermined position normally after an additional stitch has been formed subsequent to the release of the treadle. The present machine is modified to delay the upward movement of bolt 40, whereby two stitches are formed after the release of the treadle to ensure that the last stitch will extend across the butted ends of the welt, when the latter is attached all around the shoe. A bracket 174, clamped to the stem of bolt 40, has pivoted thereto at 172 an upwardly-extending pawl 170 drawn towards member 42 by a spring 178, the upper end of pawl 170 being higher than bolt 40. On release of the treadle, the upper end of pawl 170 engages the lower surface of lever 38. On the next swing of the latter, the lower edge thereof engages a notch 176 in the upper end of the pawl and moves the latter clockwise to the position shown in broken lines, when the lower hooked end of the pawl is engaged by a pivoted dog 182 and is thereby retained in said position. On the next swing of lever 38 the bolt 40 is thus free to enter the recess in lever 38. Specification 418,823 also is referred to.