GB1070791A - Improvements in or relating to shoe upper conforming machines - Google Patents

Abstract

1,070,791. Lasting machines. BRITISH UNITED SHOE MACHINERY CO. Ltd. and G. C. BARTON. Dec. 5, 1963 [Dec. 8, 1962], No. 46432/62. Heading A3B. A lasting machine of the type having wipers, a support for the shoe movable by fluid pressure from a loading station to an operating station where it is located with respect to the wipers, operator actuable means to start an operating cycle and automatic means to stop the machine at the end of the cycle, the support returning to its loading station, has operator actuable selecting means so that in a single cycle (A) the wipers perform a predetermined cycle prior to the automatic stopping of the machine, or (B) the wipers perform the predetermined cycle twice prior to the automatic stopping, the construction and arrangement being such that, when the machine stops, it is set to repeat the cycle last performed. The machine is a heel seat lasting machine generally similar to that described in Specification 235,286, modified as described in Specification 391,451 and is modified so as to perform a wiping cycle in which the wipers advance and close twice as described in the above mentioned Specification or to perform a wiping cycle in which the wipers advance and close four times prior to operation of the tacking mechanism. When set for a two wipe cycle the machine operates as follows: on depression of a treadle 2 a valve 8 moves to operate piston and cylinder 60 to move the shoe support into operative position and to raise the jack post 158. On further depression of the treadle 2 valve 10 is opened to operate piston and cylinder 12 to trip the clutch of the machine to turn a cam shaft through one revolution which urges the shoe into a heel band, clamps the heel band, lowers a hold-down 58 to position the shoe with respect to the wipers; advances and closes thewipers, retracts the wipers, raises the hold-downslightly so that when the wipers advance and close a second time they wipe with increasedpressure, operates tacking- mechanism and finally returns the various parts to their initial positions. The machine is set to a four-wipe cycle by moving a lever (66) forwards in the machine where it is held by a latch 74 against a compression spring (70). Movement of the lever (66) moves a slide 106 to operate a valve 14 which operates a piston- and cylinder 110 to render the tacking mechanism inoperative and operates a piston- and cylinder 16 which moves a catch 48 to engage a cam lever 26, which operates mechanism to hold the shoe in the operative position, thus preventing. movement of shoe support to its loading position when the cam shaft has completed one revolution. Piston and cylinder 16 also renders inoperative the stopping mechanism which normally operates when. the cam shaft has completed onerevolution. Thelever (66) is mounted on an eccentric shaft (64) upon which the bell crank 62 which operates the holding-down 58 is also mounted so that movement of the lever 66 lowers the hold-down so that the wipers operate at a lighter pressure than in the two-wipe cycle. Having set the lever for a four-wipe cycle the machine operates as follows: on depression of the treadle 2 the shoe support moves into operative position as before and on further depression of the tread the heel band is clamped, the holddown is lowered and the wipers advance- and close twice, the tacking mechanism automatic stopping mechanism and means to move the shoe-support back to its loading position being inoperative so that when the cam shaft has completed one revolution the machine starts a second wiping cycle. Just before the start of this second cycle movement of the. cam lever 26 releases the latch 47 and the lever (66) moves, under the influence of compression spring (70), to the position set for a twowipe cycle. The machine then performs the two-wipe cycle as before. At the end of this second cycle a member (86) is moved by the cam lever 26 to move the lever (66) back to its four-wipe cycle position, thus setting the machine to. repeat the cycle last performed.