Patent GB-190916250-A (GB)
Title: Improvements in or relating to Lasting or like Machines.
IPC: A43D21/02
Filed: 1909-07-12
Granted: 1910-07-12
Abstract: 16,250. Bates, A., Silvester, R. H., and British United Shoe Machinery Co. July 12. Lasting &c.-A lasting or like machine is provided with speed-controlling means for varying the rapidity of action of the lasting-devices, and, if desired, with means for throwing the pincer mechanism out of operation when the speed of the machine exceeds a predetermined limit. The invention is not limited to the employment of the particular speed-controlling device described. The rod D' is raised to actuate a one-revolution clutch on the machine shaft A<2> by means of a treadle D, the rear end of which is connected through a bent toggle M, M<1>, controlled by a spring M<2>, to a wedge K. The shaft B carries a driving-pulley B', a disk B<2> fast thereon, and a corresponding loose disk B4, to which is fixed the pulley B<3>. The machine shaft A' is driven through the one-revolution clutch by a pulley C belted to the pulley B<3>. A section through the disks B<2>, B<4> is shown in Fig. 6. Two spherical-surfaced friction wheels F are journaled in frames F which have pivots F<5> journaled in the machine frame. The disks B<2>, B<4> are adapted to engage the spherical wheels F, which are arranged to be turned in opposite directions about the bearings F<5> to vary the velocity-ratio of the transmission gear B<2>, F, B<4>. The wedge K presses the disk B<4> into engagement with the wheels F on the initial operation of the treadle and starts the pulley B<3>. The wheels F are then in a position to transmit the lowest speed to this pulley, and hence the lasting - devices are operated at their lowest speed. Projecting through an opening in the rod D' is a pin J, which is coupled to a frame lever H' pivoted at H<3> to the machine frame and carrying two pins G<3> which, through sliding connexions with the frames F<3>, are arranged to turn the frames about their axes in reverse directions to vary the velocity-ratio of the gear B<2>, F, B<4>. To raise the speed of the machine, the treadle is given a further depression after actuating the wedge K. This breaks the toggle M, M<1>, after which the pin J is operated and the speed of the machine is gradually increased. Instead of the disk B<4> being loose on the shaft, it may be fixed axially with relation to the disk B<2>, the wedge K being omitted and the mechanism arranged so that, in the inoperative position of the treadle, the wheels F are turned out of engagement with the disks B<2>, B<4>. To avoid breakage of parts when the speed of the machine has reached a certain limit, the clutch rod D<1> is coupled by a rod N to a pivoted cam N<1>, a projection N<3> in which is adapted to actuate a sliding plunger, arranged on the head of the machine, at a given position of the speed-controlling gear. This plunger is coupled through a resilient connexion P<2> to a pivoted lever Q adapted to unclutch certain placer-mechanisms from the shaft A<2>. As shown, the machine is arranged so that the overdraw movement of the grippers may be stopped by unclutching the overdraw cam, but any other suitable mechanism may be used ; for example, the updraw cam may be provided with devices for disconnecting it from the shaft ; or both the updraw and overdraw cam may be affected. The overdraw cam R is loose on a boss S, and is normally driven by means of a spring pawl T on the cam R, which has a projection T<1> with which to engage a recess S' in the boss S. The lever Q carries a cam-shaped projection Q', which is forced by the operation of the connexion P<2> into the path of a lug T<3> on the pawl T, which is consequently withdrawn from its engagement with the collar S, unclutching the overdraw cam. The cam R is held by a lug Q3 on the lever Q, which meets the lug T<3> on the pawl T. Specification 14,453/97 is referred to.