Patent GB-177254-A (GB)
Title: Improvements in or relating to machines for operating upon heels
IPC: A43D79/00
Filed: 1920-12-22
Abstract: 177,254. Barclay, W. R., Woodcock, R. B., and British United Shoe Machinery Co., Ltd. Dec. 22, 1920. Heels, machines for. - At different stations in a combined heel - pricking and attaching machine, pricking and nailing dies are provided respectively to guide awls and drivers both operated by power - actuated means of the machine. The invention is described as applied to a heel-attaching machine of the type described in Specification 23031/11, the pricking- means being housed in a casing 2 attached to the right-hand side of the column 1. This casing has a pinion chamber 3 and a pricking plunger guide and pricking abutment support chamber 4. The plunger-guide chamber has vertical guideways 5 lying in a vertical plane at an angle of 45‹ to a vertical plane from right to left of the heelattaching machine, and guiding a die-carrier 6 to which is open at the front and has vertical guides for a pricker head 8. The carrier and head have hori zontal guideways 11, 10 to receive respectively a die 13 and a pricker block 12 carrying a gang of awls 14. The block and die are coupled by perpendicular rods. The carrier has ears 15 pivoted to ears 17 of a table 18 forming a continuation of the die 13 and carrying, by a pivot 19, a swing- ing arm 20 to which is connected a plate 21 having a bevelled opening 22 to receive a heel. The arm 20 can be swung inwardly to position a heel over the die 13, and is latched by a lug 27 snapping behind a shoulder 28 on the pivot stud 16. In closing, a cam projection 29 on the lug 27 acts on an arm 30 of a lever 31 to actuate a rod 34 which operates through the arm 35 and shaft 36 to trip the machine clutch (see the part R<8> in Specification 23031/11). The inclination of the table 18 may be varied to suit that of the die in use by adjusting a screw 40 in engagement with a notched plunger 37. The pricker head 8 is coupled to a slide bar 46 which carries at its end a cam roll 49 which enters a cam-groove 50 in a cam 51 fast on a shaft carrying a pinion 52 of twice the diameter of a pinion 53 with which it meshes and which is slidably mounted on the crank shaft 48 under control of a dog-clutch collar 54 and operated through an arm 58. For each revolution of the crank-shaft the cam makes hall a revolution so that one pricking operation, when the roll 49 engages the eccentric part of the cam 50, corresponds to two heel attaching operations. In operation the machine is actuated at attach a heel, and a heel is placed on the plate 21 whilst the roll 49 travels round the ccncentric part of the cam 50. The arm 20 is then swung inwardly and latched, tripping the machine a second time to prick the heel and attach the top lift. During the upward movement of the head 8 the carrier 6 is raised owing to friction between the carrier and the head until the heed engages the abutment 44, whereupon the prickers are driven into the heel. The head, during its return movement, depresses one arm of a lever 60 to raise a plate 62 engaging a shoulder on a rod 64 connected at its upper end to a lever 66 which operates to release the latch 27. On release the arm 20 is swung outwardly by a spring 68 under control of a plunger device 70, 74 and operates to release the clutch through the lever 31. To allow of the machine being operated whilst the pricking mechanism is not in use the lever 31 is held in its outward position by the engagement with the periphery of the concentric portion of the cam 50 of a roll 75 on a lever 76 connected to the lever 31 by a rod 77.