Patent GB-130736-A (GB)
Title: Improvements in or relating to Pressure-applying Machinery for use in the Manufacture of Boots or Shoes.
IPC: A43D35/00
Filed: 1918-08-02
Abstract: 130,736. British United Shoe Machinery Co., (United Shoe Machinery Corporation). Aug. 2, 1918. Sole-laying; sole-levelling.-A machine for applying pressure to a shoe bottom, such as in laying or levelling soles, is arranged so that a yield of definite amount of the pressure-applying means causes cessation of application of further pressure. The lasted shoe is mounted on a jack of usual construction carried by a cross-head 5, which is mounted to slide on vertical rods 13, but normally rests on collars 15; springs 16 bear upon the cross-head and engage a yoke 17, which can be adjusted vertically by rotating a hand-wheel 22' to vary the degree of compression of the springs. The lasted shoe is supported in the usual manner above a form 12 mounted on a bed 23 of usual construction. The bed is actuated by togglearms 24, 25, the joint of which is connected by a pitman 27 to a crank 28 on a crank-shaft 29 geared by wheels 31, 32 to a power shaft 33. This shaft carries at opposite ends loose pulleys 34 which are constantly driven in opposite directions and are controlled by clutches of a well-known type, each comprising an operating-finger 36 co-operating with a sliding-cone 37. These cones are controlled bv forked shipper levers 38 fixed on rock-shafts 39 and adapted to be operated alternately by the engagement with their inner faces of nuts 44 on the threaded ends of a rod 40 passing through the levers. The rod 40 is actuated by an arm 41 extending from a rock-shaft 42 which carries a treadle 43 extending on both sides of the shaft ; nuts 45 mounted on the ends of the rod 40 outside the levers 38 prevent both clutches from being thrown into operation at once, while a spring 46 normally holds both clutches out of operation. In association with the clutch mechanisms, there is a brake mechanism comprising a bifurcated brake shoe 48 which is normally pressed downwards by a spring 52 into engagement with brake drums 47 on each side of the gear 31 on the shaft 29. When either clutch is rendered operative, the brake shoe is lifted clear by connexions between the brake shoe and the shafts 39; these connexions comprise levers 53 pivoted on shafts 54 at each side of the brake shoe and having their inner ends articulated with the brake shoe by means of a screw 55, and levers 56 also pivoted on the shafts 54 and carrying at their inner 'ends adjustable screws 57 to engage and lift the levers 53; the outer ends of the levers 56 are connected by rods 58 and arms 59 to the shafts 39. When a clutch is thrown into operation, the corresponding toggle 24, 25 is straightened to raise the bed 23 until the form 12 engages the shoe; continued movement causes the jack to rise, so that the shoe is subjected to a pressure due to the weight of the jack and the degree of compression of the springs 16. The amount of this compression is limited by the engagement of a bracket 60 on the cross-head 5 with a nut 62 adjustably carried by a rod 61 passing loosely through the bracket and pivotally connected to the lever 56; movement of this lever throws the clutch out of operation and also releases the brake shoe to arrest the movement of the actuating-mechanism, leaving the shoe under pressure. When the position of the treadle is reversed, the power shaft 33 at once moves in the opposite direction to lower the operative form 12 and to raise the other form into operative position.