Patent GB-573883-A (GB)
Title: Improvements in or relating to the moulding of rear parts of shoe uppers
IPC: A43D8/00
Filed: 1943-12-23
Abstract: 573,883. Making shoes. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). Dec. 23, 1943, No. 21508. [Class 17 (i)] Moulding upper parts. A machine for moulding the rear parts of complete shoe uppers or separate upper rear parts or counters is designed to perform, at a single station and one handling of the workpiece, the operations of moulding the part to the shape of the rear part of a last, crimping the lasting margin to ensure uniform pleating, and turning in and moulding the margin. Means also may be provided for stretching the shoe part to define the heel seat line and also at an intra-marginal part for holding a lining at the rear part, and for stretching the shoe part at the shank. The machine is operated hydraulically and may be set to complete the cycle of operations automatically or to stop at an intermediate point in the cycle. The shoe part is supported on an inner mould 24, Fig. 4, which has the shape of the rear part of' a last and is carried fixedly on a vertically movable jack 26. The lasting margin rests on a crimping plate 28 mounted for horizontal but not vertical movement. A head 18 mounted for vertical movement carries an outer mould 20 and a pair of wiper plates 22 formed with corrugated edges. In operation, the shoe part is positioned on the inner mould by gauges and held in position by the lining grippers which grip against the crimping plate. The shank grippers are closed on the lasting margin at the shank and moved manually to stretch the shoe part. When the machine is' started, the head moves downwards until the wipers engage the lasting margin on the crimp. ing plate. Continued descent of the head causes the wipers to close around the crimping plate and the outer mould to engage the shoe part at the tip of the inner mould. The machine may be set by manual means either to stop at this point or to continue its cycle. When the cycle continues, the jack is moved upwardly and increased downward pressure is exerted by the head, so as to mould the shoe part between the moulds and to impart crimping pressure to the wipers. The outer mould now moves upwardly relatively to the head, against springs, in order to stretch the shoe part, while it is held on the crimping plate, at the seat line, and also to cause cam means to close the side parts of the outer mould about the inner mould. The pressure of the wipers on the crimping plate is next relieved slightly, and the latter is retracted from beneath the lasting margin and the wipers. The latter are then again moved downwardly and closed to flange or turn in the lasting margin upon the heel seat. The crimping plate is next moved forwardly to abut the rear faces of the wipers and the inner mould is moved rearwardly to compress the flange of the shoe part against the wipers, the jack having been lowered somewhat at this time to permit movement of the inner mould. The machine then returns to starting position. The head 18 is secured to rods 36, is held raised by springs 46, and is lowered by a piston 44, Fig. 6, when fluid pressure is exerted on a pair of piston heads 392. The outer mould 20 is carried by a slide 62, Fig. 4, urged downwardly on the head 18 by springs 78, and comprises two similar members removably pivoted on the slide and normally held apart by a spring. They have cam surfaces whereby they are closed yieldingly on the inner mould. The wipers 22 are carried by a plate 116, Fig. 8, carried by the head 18 and movable relatively thereto against the action of springs. At appropriate times in the cycle of operations, the wipers are closed by rack teeth 134 operated by teeth 136 on gear racks 138, and are moved downwardly and closed with heavy pressure by a floating rack 150 and connecting gears 142 also operated by the racks 138. The latter, which move with the head 18, are operated by gear segments 158, Fig. 4, which can move vertically on a slide way 174 and are rocked by a rod 176 operated by a bell-crank lever 186, rod 660, and pistons 668, 669. The initial position of the wipers is determined by adjustment of the rod 176. The jack 26 is adjustably secured to a piston 230 slidable in a cylinder 232 above the head piston 44. The inner mould is detachably secured to the jack 26 and carries a back seam gauge 256, Fig. 4. The crimping plate carries an edge gauge 266 and is carried by a housing 276 slidable forwardly and rearwardly on the machine frame and urged forwardly by a spring 288. The housing encloses a piston 290, which is connected to the inner mould 24 so as to permit relative vertical movement only. The piston carries large and small pistons 292, 294, and is held against forward movement by an arm 310 and is urged rearwardly by a spring 322. When pressure fluid is admitted behind the small piston 294, the housing 276 is moved rearwardly to retract the crimping plate ; when it is admitted in front of the large piston 292, the housing moves forwardly to press the crimping plate against the wipers, and the piston 290, with the inner mould, then moves rearwardly to mould the flange. The lining grippers 330, Fig. 8, are held open when the machine is at rest and are closed manually. The shank grippers 733, 734 are operated manually. In place of the two-part outer mould, a unitary outer mould with somewhat resilient sides may be used. The inner mould may be fitted with a plug which is held, by spring pressure, projecting above the rear end of the mould. The plug yields as the moulds engage, and stretches an intra-marginal portion of the shoe part. Further, the inner mould may be arranged to project forwardly of the outer mould when the machine is at rest, and to be moved rearwardly to operative position by cam means when the head 18 descends. The hydraulic system includes a constantly-driven pump which draws oil from a sump in the base of the machine. To start the machine, a treadle 432 is depressed so that oil passes by way of a valve 406, Fig. 6, which is then locked open by a latch 456, to operate the head piston 44. The latch may be unlocked at any time, in order to return the machine to starting position, by depressing a second treadle 474. It is unlocked automatically at the end of a complete cycle of the machine by means of a rod 480 actuated by a cam operated by a fluid motor 592. If the treadle 474 is not depressed, the machine may come to rest when the head 18 has been lowered. Further operations of the cycle are then initiated by depressing a hand lever, not shown, which moves a valve 510 to permit fluid to pass to a distributer chamber 512. A manually-adjustable pin may, however, be set to cause the hand lever to be depressed automatically by the head as it descends, in which case there is no break in the cycle. From the distributer, pressure fluid passes by a passage 582 to the fluid motor 592, which turns at a predetermined rate a pair of valves 594, 596, rotation of which controls the remaining operations of the cycle. At the appropriate times, fluid passes by a passage 496 and slide valve 406 to the space between the jack and head pistons 230, 44, and by passages 688, 680 to the wiper-operating pistons 668, 669. Fluid further passes by passages 702, 704 to the spaces behind the small crimping plate piston and in front of the large crimping plate piston. When the cycle has been completed, the cam operated by the motor 592 releases the latch 456 so that the valve 406 returns to its starting position. This relieves the pressure on the head piston and the head, in rising, returns the valve 510 to starting position, whereupon the parts of the machine all return to starting position.