Patent GB-191114719-A (GB)
Title: Improvements in or relating to Heel-attaching Machines.
Inventor: GLIDDEN LESTER LELAND
IPC: A43D79/00
Filed: 1911-06-21
Granted: 1912-06-20
Abstract: 14,719. Glidden, L. L. Nov. 2, 1910, [Convention date]. Heels, machines for.-Heeling-machines of the type described in Specification 5405/02 are provided with automatic means for adjusting the jack vertically to the thickness of the heel or top-lift, and are arranged so that this jack-adjusting mechanism and the driving-mechanism of the nailing-die and nail-driver are controlled by a single device, preferably a treadle. The shoe is carried, as in the machine described in the above-mentioned Specification, by a vertically-adjustable swinging jack pivoted to a slide depending from a top beam, the rear end of which is pivoted to a rod 22, Fig. 3. According to the present invention, this rod is fixed in a slidable block 23 dovetailed to the upper wedge 25 of a series of four oppositely-disposed wedges 25, 26, 27, 28, which have a sliding engagement with each other. The wedges 25, 27 are formed with racks in gear with a pinion 31, Fig. 7, while racks on the other two wedges gear with a pinion 32. These pinions mesh with a rack 33, which is connected by adjustable springs 34, Figs. 3 and 7, to the machine frame. When the mechanism is free to operate, the wedges are moved to raise the rod 22 until the lasted shoe is lowered on to the heel held in the heel-holder, or until the attached heel has been lowered on to the top-lift, as the case may be. The arrangement of the wedges constitute a self-locking device, which positively resists the tendency of the jack to rise during the subsequent compressing operation. The wedge-mechanism is normally held inoperative by the engagement of a detent 41 located between guides 38 carried by a rod 39 with a shoulder 42 on a rod 37, which is pivoted to the rack 33, and is adapted to slide between the guides 38. The release of the rod 37 is effected from a treadle lever 43 through a link 45, which rotates a rock-shaft 47 to effect the disengagement of a catch 48 from the end 49 of the rod 37 and to allow this rod to rise clear of the detent 41. The same treadle lever, when fully depressed, also actuates the nailing-die and the nail-driver, which, according to the present invention, are arranged to move independently of each other. The treadle has an upward extension 52 adapted to engage an arm 53 of a rock-shaft 54, from which a spring-controlled arm 55 projects and co-operates with the clutch of the driving-shaft 58. One end of the rod 39 is pivoted to a crank 59 formed on the centre of the shaft 55, and its other end is pivoted to the knee 62 of a toggle 63, 64, the lower link of which is pivotally connected to an adjustable block 65 fixed in the machine frame. The upper link 63 has a lost-motion connexion with the nail-driver block 72, so that it operates the naildrivers during the last part of its movement. During the lost motion, the nailing-die, which is removably mounted in a cross-head supported at the upper end of links 75 fixed in a crosshead 76, is raised to compress the work by a double set of toggles 79 actuated through adjustable links 82, cam levers 84, and connexions with the rock-shaft 54. The driver-block 72 is adjustably mounted in its cross-head 77 to enable the nails to be completely, or only partly, driven. A heel-holder 98, Fig. 5, and top-lift holder 99 are mounted on a carrier 101 in the usual way; a locking-device, however, is provided to lock the carrier in heel-nailing position. The carrier is connected by a rod 108 to an arm 109 projecting from a rock-shaft 111, Figs. 5 and 6, which is acted upon by a spring 113 tending to turn the carrier always into the position shown in Fig. 5, that is, with the toplift holder 99 above the nailing-die. When the usual nail-loader 103 is moved over the nail-die, it swings the carrier 101 so that the heel-holder 98 is moved into nailing position; during this movement, a spring latch 115 located in an arm projecting from the shaft 111 passes behind a keeper 118 and locks the carrier in its heelnailing position. After the completion of the heel-nailing operation, the rod 22, as it descends, releases the latch from its keeper, and the carrier is swung back again to bring the toplift holder into nailing position.