Patent GB-501845-A (GB)
Title: Improvements in or relating to machines organized for pressing breast flaps on shoe soles against heels
IPC: A43D25/12
Filed: 1937-08-06
Abstract: 501,845. Cementing breast flaps to heels; shaft couplings. BRITISH UNITED SHOE MACHINERY. CO., Ltd., BRAY, W. N., and BARTON, F. Aug. 6, 1937, No. 21663. [Class 17 (i)] [Also in Group XXIV] A machine for pressing breast flaps on shoe soles against heels has a plurality of work supports spaced apart around a rotary turret each provided with pressing devices arranged to engage the breast and rear faces of the heel, the devices being positioned manually and thereafter urged firmly against the heel by power, the turret being rotated by power to bring the work supports successively to a workchanging station. A rotary turret 39, Fig. 8, carries twelve work supports each comprising a last pin 75 and a toe support 91, the latter carried by a flexible metal strip 93. A pad 107 for engaging the rear face of the heel and an interchangeable pad 109 for engaging the breast face are carried by pairs of bell-crank levers 117, 137 pivoted at 143 to an arm 149 urged upwardly by a spring 199 and pivoted to a lever 195 having a cam roll 201 engaging a fixed cam 209. The upper ends of the bellcrank levers are urged together by a spring 163, but are linked to a pivot 159 on an arm 161 linked to the arm 149 and connected by a pivot adjustable along the arm 161 to a link 179 actuated by a lever 183 carrying a toothed sector 191 co-operating with pawls 213, 309. The pivots of the pads 107, 109 are extended, those to the right of the operator being covered by rubber sleeves and those to his left having curved hand-holds. These members are engaged by the hands of the operator, after the shoe has been positioned, to bring the pads forwardly and downwardly on to the heel against the action of the spring 199. The pawl 213 is carried on a pivoted arm 217 actuated by a step on a ring 231, Fig. 1, normally retained at the operator's position by a spring 245 but capable of angular rotation to the adjacent position allowed by a lug 243 engaging a recess. The step is raised, against the action of a spring, by a treadle 255, Fig. 3, urged upwardly by a spring 2J5, suspended by a link 283 from a lever 285 having a fixed pivot 287, the treadle having a fork at its end engaging pins 277 on a lever 273 pivoted at 275 and linked to a lever 261 suspended by a link 263 from an eccentric on a driven shaft 25 and pivoted to a collar on a sleeve connected to the ring 231. The lever 273 has an extension carrying a rack 303, Fig. 19, co-operating with a pawl 305 normally held back by a stop arm 351 which is freed by a latch 357, pivoted to the lever 285, on descent of the forward end of this lever. The latch is held out of action when the treadle is in a lowered position by a finger 367 also pivoted to the lever 285, the latch 357 and pawl 305 having been released by a cam-actuated rod 375 at the end of the cycle. The rear end of the lever 285 actuates a push rod arranged to engage a clutch of the kind described in Specification 720C/07, [Class 17], driving a worm 15, Fig. 3, gearing with a worm-wheel 17 carrying a disc having twelve spaced recesses each receiving in turn a roll at the end of a rod allowing the clutch to be disengaged when the turret has made one twelfth of a revolution. To lessen shock at stopping and starting the worm-wheel is connected to the turret 39 yieldingly, the worm-wheel carrying pins 41, 43, Fig. 7, engaging slots in a disc secured to the turret, the disc carrying bellcrank levers 59 each carrying a stop 63 engaging an arm 55 urged against a block 51 and a pin, springs 71 tending to keep the pins and blocks in line. The pawl 309, Fig. 12, is guided by a pivoted arm 389 and pivoted to a pair of togglelinks 411, 413, bent and straightened by a link pivoted to a bell-crank lever 421 actuated by a cam roll 425, a cam track 427 being provided at the operator's position. The pawl has a latch 397 actuated by a cam 403. A cam surface 437 on the pawl retracts it by contact with a roll 391 when the toggle is broken. This can also be done, when desired, by a handle linked to a rod 445. In operation, a shoe is positioned on the work support at the operator's station. Previously, the shoe has been treated in an apparatus A, Fig. 1, of the kind described in Specification 343,151 for softening glue applied between the breast flap and the face of the heel. The clamps 107, 109 are positioned by hand, the pivot connecting the arms 161, 179 being adjusted, if necessary, to vary the proportional amount of pressure applied heightwise and lengthwise respectively, of the shoe. The movement of the clamps carries the sector 191 past the pawl 213. The treadle is then partially depressed, first raising the pins 277 and the step 229 to press the pads against the heel. At a certain point the pawl 305 is released and the clamps held ; prior to this point the treadle can be released and the clamps repositioned if necessary. Further depression of the treadle swings the lever 285, starting the machine. As the eccentric on the shaft 25 revolves, the pads are pressed more firmly against the work by power. The turret is, also, rotated to carry the shoe away from the loading station, the roll 201 on the arm 195 leaving the recess in the fixed cam 209 to swing this arm forwardly, and the roll 425 entering the track 427 to swing the sector 191 further upwardly. The operations are then repeated on the shoe support that has arrived at the loading station.