Patent GB-191502393-A (GB)
Title: Improvements in or relating to Machines for Operating upon Heels for Boots and Shoes.
IPC: A43D83/00
Filed: 1915-02-15
Abstract: 2393. British United Shoe Machinery Co., [United Shoe Machinery Co.]. Feb. 15. Heels, machines for.-Machines for operating upon heels, in which the work is automatically measured between two pressing-members before the application of full clamping-pressure by power-operated means, are arranged so that the measuring operation is effected by a spring or similar motive element energized during the previous operation of the machine. The invention is described as applied to a heel-attaching machine of the kind disclosed in Specification 3314/91, in which the vertical position of the jack carriage is determined by a large screw resting at its lower end on a support 22, Fig. 3. This screw is rotated to raise the jack carriage by being geared with a rack 28, and the rotation of the screw is utilized to effect the measuring operation. The rack is connected by a short link 29 to a bell-crank lever 30 pivoted at 31 to a stationary block 20 and carrying a pin 32, which projects into a recess in the lower end of a bar 40 ; the pin is normally held in engagement with the upper end of the recess by a spring 36 surrounding a long pin 34, which also engages the recess in the bar 40. This bar is arranged for movement parallel to the usual side rods 12, being guided at its lower end by the lever 30, and at its upper end by a box formed in a casting 46 secured to the left-hand side rod 12. A spring 42, secured at its lower end to the machine frame and at its upper end to the bar 40, provides the source of motive power for actuating the rack 28 for the measuring operation. The rear side of the upper end of the bar 40 carries a catch plate 48, Fig. 5, which is adapted to be engaged by a dog 52 pivoted to the casting 46. In each cycle of the machine, the dog 52 engages the plate 48 and lifts the bar 40 in opposition to the spring 42, and the machine comes to rest with the spring energized ready for the measuring operation. In case the dog is tripped when there is no work in the machine, a stop-pin 21, Fig. 3, is provided to engage a projection 30<a> on the lever 30 to limit its movement ; on the other side of the pin, a buffer pin 33 is mounted to cushion the return movement of the lever. For tripping the dog 52, it is connected to a sliding trip-piece 56, Fig. 5, mounted in the casting 46 and carrying a transverse pin 66, which is adapted to be engaged on one side of the trippiece by a striking-piece 64 set in a yoke 62 journaled on a shaft 60 : and on the other side of the trip-piece, it is adapted to engage a pin 68 projecting from a collar 57 rigidly secured to the shaft 60. The yoke 62 is connected by links 70, 72, Fig. 3, to a treadle, and the arrangement is such that, when the treadle is first depressed, the trip-piece is moved to disengage the dog 52, whereupon the bar 40 is moved by its spring 42 to effect the measuring operation, while further depression of the treadle causes the pins 66, 68 to engage each other to rotate the collar 57 and shaft 60, which is connected to the main clutch mechanism of the machine. A projection upon the rear side of the bar 40 prevents the dog 52 from being moved sufficiently to enable the shaft 60 to turn before the bar 40 has been moved downwards in the measuring operation. A handle 44 projecting from the bar 40 provides means for lifting the bar if it is desired to release the work after the measuring operation has taken place ; it also provides means for resetting the spring 42 in case it should be found necessary to do this without starting the machine.