Patent GB-247929-A (GB)
Title: An improved method of and apparatus for uniting crude rubber to leather or other supporting surfaces
IPC: A43D25/18
Filed: 1926-01-26
Abstract: 247,929. Enna, E. F. H. Feb. 21, 1925, [Convention date]. Compound sheet materials.-A laver of crude rubber is united to a layer of leather, crude or vulcanized rubber, or other supporting surface, by first abrading its surface, and then applying the abraded surface under pressure to the supporting surface. The inveption is particularly applicable for uniting leather or rubber soles to boots and shoes, and the crude .rubber layer may form an intermediate layer between the insole of the boot or shoe and the outsole, in which case it is inserted into a groove formed in the insole ; the exposed surface of the rubber is then roughened and applied to the roughened surface of a leather strip in another machine. The leather surface may also be roughened and have solution applied to it to assist cohesion. As shown in Fig. 1, the crude rubber strip 10 is led from a roll 11 between guide rollers 12, 20, under a guide roller 13 and over guide rollers 14, 15 to a feed roller 16, by which it is fed through a guide 41 to the upper surface of the supporting strip, on which it is pressed by a hammer or hammers 64<a>, 64<b>, Fig. 2. Between the rollers 14, 15 is situated an abrasive wheel 24 mounted on a shaft 25, geared through a shaft 30 to the main driving-shaft 54 of the machine, and the rubber strip is raised by a frame 40 into contact with the wheel 24 when a rod 38 connected to the frame is raised by a lever 36 actuated by a rod 34 on depression of the starting-pedal. The direction of rotation of the wheel 24 is such that it tends to move the rubber strip in the direction in which it is fed, whereby tearing of the surface is prevented. The hammers 64<a>, 64<b> are operated by a crank 55 on the shaft 54 acting through a rod 56 having a pin-and-slot connection with the carrier 59 of the hammer 64<a>, the rod 56 being mounted in guides in a carrier 76 pivoted to the main frame of the machine, which is adapted to be oscillated to feed forward the supporting surface by means of a cam 81 on the shaft 54 acting through a rod 92, and connections 93 - - 96 on a slotted sector 99, in the slot of which engages a pin 101 on one arm of a bell-crank lever 100 pivoted at 103, the bell-crank being adapted to effect oscillation of the hammer carrier 76. The supporting surface is adapted to be held in place on a plate 77 on the anvil of the carrier 76 by means of a presser foot 84 pivoted at 83, which is normally held depressed by a spring 87, and is operated by a cam 80 on the shaft 54 acting through a rod 85. The movement imparted to the hammer carrier by the cam 81 is utilized to drive the strip feed roll 16 by means of a rod 109, pivoted at 124 to the carrier and at 123 to the main frame of the machine and connected to a rod 108 provided with a pin 120 engaging a slot 119 in an annular clutch member which drives the roller 16 through balls and slots 116. 115. Reverse movement of the roller 6 is prevented by pawls 111, 112, and the arrangement is such that the feed roller moves forward the rubber strip at a speed corresponding to the rate of movement of the carrrier 76. When the strip of rubber has been united by the hammers to its supporting surface, the used length is severed by a pair of shears of known construction which are operated by a hand lever 134, the unused strip being retained in position by a grooved roller 53 on the guide 41. When it is only necessary for a part of the width of the strip to be pressed on to the supporting surface, one hammer 64<b> is put out of action, the degree of oscillation of the carrier 76, and hence also the rate at which the rubber strip is fed are reduced, and the guide 41 is angularly adjusted whereby the part of the strip which is not to be united with the supporting surface is lifted clear thereof. These adjustments are all effected by depressing a pedal connected by a rod 106 to the bell crank 100. The pin 101 is thereby raised in the slot of the sector 99 so that the degree of oscillation of the carrier 76 is reduced. The pedal is also connected to a rod 74, Fig. 5, so that its depression rocks a bell crank 73 to move a pawl 68, mounted on the carrier 65 of the hammer 64<b>, out of a slot 71 in the carrier 59 of the hammer 64<a>. The hammers are thereby disconnected and the hammer rod 65<a> is raised to its highest position in guides 66, 67 by a spring 74a. At the same time, a projection 126 on the bell crank 73 raises an arm 128 to rock a shaft 129 and thereby an arm 130, Fig. 4, to actuate a bent rod 125 to vary the angular position of the carrier 41, which can pivot about an axis 42. The rod 125 and guide 41 are returned to normal position when the bell crank 73 is again lowered by springs 133, 132 respectively. As shown in Fig. 5, on a worktable 143 which supports the leather &c. to be fed under the hammer is a stop 146, the position of which may be varied by means of the hand-operated levers shown to vary the position of the rubber strip 10, the edge of which rests against the stop. Fig. 7 is a sectional elevation of a grooved leather sole fitted with a rubber strip, the central pleat of rubber shown, which is formed at the narrow forward end of the sole, being cut away to leave the rubber surface flush with the leather edges.