Patent GB-976625-A (GB)
Title: Improvements in or relating to shoe machines
IPC: A43D21/12
Filed: 1960-12-12
Abstract: 976,625. Boots &c. BRITISH UNITED SHOE MACHINERY CO. Ltd. Dec. 12, 1960 [Dec. 14, 1959], No. 42617/60. Heading A3B. A bed lasting machine comprises a support for the last, a wiper head, and means for causing relative movement between the two said parts and power operated means to urge a flexible toe band mounted in the wiper head into engagement around the toe portion of the upper. The machine may include independent power operated means to exert a force on the end portions of the toe band and at two localities adjacent to and one on either side of the mid-portion of the band, to urge the latter into engagement with the upper. The toe band may comprise a thin resilient strip of metal and secured thereto a strip of material having a low co-efficient of friction and shaped to provide a narrow operating edge. Toe wipers 20 are mounted on a wiper head 24 for advancing and closing movement by means of an operating rod 36 which slides along a bore 34 in the wiper head and is connected at one end to one arm of a bell crank lever 40 and at the other end to a crosshead 38 linked to wiper holders 22. The other arm of the lever 40 is connected to an advancing and closing mechanism similar to that desribed in Specification 943,891. Heightwise movement of the head 24 and the wipers 20 relative to the toe end of the shoe is effected by an arm 32 which is pivotally mounted and is moved by a link 46 as described in Specification 943,891. The wiper head is mounted for angular adjustment on a carriage 30 slidably supported on the arm 32. The flexible toe band is also mounted on the wiper head 24 for heightwise movement and comprises a strip of polytetrafluoroethylene 51 of generally wedge shape crosssection, which strip is supported on a band of resilient spring steel 54. A power operated means to exert a force on the end portions of the toe band to urge it into engagement around the toe portion of the upper comprises an air operated cylinder 106 which operates a lever 92, which is pivoted towards one end on the wiper head 24 by a stud 96. An equalizing lever 90 is pivotally mounted on the operating lever 92 by a pin 94 and mounted on the former are two links 84 which are secured to the outer end portions of the toe band. A presure reducing valve 202 (not shown) in the air supply to the cylinder 106 provides for control of the forces applied to the toe band. Pins 142 on a bell-crank lever 144 project through slots 140 provided on the links 84 and by suitable rotation of screws 150 the end of the bellcrank lever 144 is urged against a knurled head 148 and moves the outer ends of the toe band towards or away from each other to accomodate shoes of different sizes. A second power operated means presses the toe band against the upper at two localities adjacent to and one either side of the mid-portion of the band. A cylinder 178 (Fig. 3) has slidably mounted in it a piston 176 which projects through one end of the cylinder. Pivoted, one to the piston rod and one to the opposite end of the cylinder, are two arms 164 and 168 which are pinned to shafts 160 mounted in a block 74 to which shafts are pinned other arms 166, 170 respectively on which are mounted pressure pads 196 and 192. The pads are arranged to apply the aforesaid forces to the toe band. A presure reducing valve 204 in the air supply pipe 186 leading to the cylinder 178 provides for control of the forces applied to the pressure pads. Operation of these two valves is independent. Specification 976,626 also is referred to.