Patent GB-910675-A (GB)
Title: An improved apparatus for lasting footwear
IPC: A43D21/12
Filed: 1959-02-25
Abstract: 910,675. Shoe upper conforming machines. KAMBORIAN, J. S. Feb. 25, 1959 [Sept. 22, 1958; Dec. 4, 1958], No. 6524/59. Class 17 (1). A toe lasting machine comprises a last support, wipers 36, retarding means 18, and a control system whereby the retarding means is caused to grip the lasting margin and restrain it against descent, then the last support is moved downwardly to an automatically determined position in which, irrespective of the depth of the last, the bottom surfaces of the wipers are coplanar with the exposed surface of the insole for subsequent inwiping. In the operation of the machine for cement lasting, the last with the upper thereon is placed with its toe resting on clamp 128, and at a first operation of the control switch clamps 126, 128 are caused to come together and bring the shoe down to a position in which the insole is above the wipers, and clamp 152 engaged with the heel. After a predetermined time, fingers 78 spread the lasting margin over the wipers where they are clamped by fingers 110, and after a further time, the last is moved downwardly to tension the margin and to position the insole in the plane of the wipers. The machine then comes to rest, and the operator may swing the shoe laterally to remove any wrinkles, and applies a ribbon of adhesive, alternatively, the margins may be precoated with pressure and/or heat-responsive adhesive. On a second operation of the switch the wipers are moved inwardly, and towards the end of this movement, the last support is moved upwardly to apply a bedding pressure. The machine again comes to rest, then on a third actuation of the switch the parts are returned to their initial positions. When making welted shoes, the upper or lining may be impregnated with stiffening compound, or an impregnated insert positioned between the upper and lining, and the upper shaped to the insole rib by the wipers. Alternatively, the margins may be secured to the rib by staples. The excess margin may be trimmed. The machine may also include means for lasting the sides of the shoe, and ironing means for the shank. The wiper blades 36 carried by cam plates 38 are moved by means of cylinder 52 acting via adjustable coupling 49, slidable block 48 and links 46, the movement being controlled by pins 42 engaged in arcuate slots 40 in plates 38. The wipers may be initially adjusted to conform to the shoe manually by adjustment of coupling 49, or, if desired, they may be adjusted automatically by releasing pivots 61, when cylinder 52 acts first to advance and then close the wipers to engage the shoe, and then to move pivots 61 to the ends of slots 62, when the pivots and hence the wipers, are locked by fluid-operated means. The respective fingers 78, 110 of spreaders 16 and clamps 18 are shaped and arranged as in Fig. 19. Fingers 78 are moved, from an initial position in contact with the wipers, upwardly, inwardly over the lasting margin, downwardly to contact the insole, and outwardly to remove the pulling over tack and hold the margins against the wipers. Fingers 78 are moved by fluid-operated means acting via rod 90, adjustable screws 104, 98 limiting the movements and brake pads 92 causing the fingers to be moved heightwise before longitudinally. The margins are clamped against the wipers by fingers 110 moved downwardly by cylinders 122. The toe clamp comprises jaws 128, 126 operated respectively by cylinders 138, 137, jaw 126 and the heel clamp 24 being mounted on the swingable carriage 20 which permits the shoe to be swung laterally before wiping. The heel clamp comprises jaws 152 adjustable heightwise on post 154 by bolt 156 engaged in an arcuate slot 158, the post being adjustable on plate 160 by means of pin 164 and holes 162 and plate 160 being slidable longitudinally by means of cylinder 170, and locked by latch pin 169 operated by cylinder 171. Heightwise movement of carriage 20 to position the shoe heightwise is brought about by cylinder 138 controlled by a valve 266 which is in turn controlled by movement of an arm 276 pivoted to the post 129 carrying jaw 126 and moved by means of a coil 264. The first downward movement, to position the insole above the wipers, is arrested by engagement of a pin 286 on arm 276 with the upper end 290 of a pivoted bar 326. Thereafter, bar 326 is swung by means of a coil 324, freeing pin 286 from shoulder 290 and permitting further downward movement of the carriage until pin 286 is again arrested by engagement with a shoulder 330 on bar 326. The insole is then positioned in the plane of the wipers. The fluid and electrical circuits are described and illustrated, the latter including a master switch by means of which the machine can be brought to rest with the various instruments retracted. Specification 910,676 is referred to.