Patent GB-130130-A (GB)
Title: Improvements in or relating to Last-pulling Machines.
IPC: A43D3/10
Filed: 1918-07-19
Abstract: 130,130. British United Shoe Machinery Co., (United Shoe Machinery Corporation). July 19, 1918. Removing shoes from lasts. - A last-pulling machine such as of the type described in Specification 14174/15, is provided with means for rocking the last and shoe transversely of the shoe during the pulling operation, with means to incline the last and shoe while the last is moving diagonally heightwise and rearwardly out of the shoe, and to reverse the inclination for rights and lefts, and with means to indicate the condition of the machine to the operator at the end of each cycle to ensure the presentation of the proper shoe, whether right or left. The general arrangement of the machine is substantially the same as that described in the said prior Specification, but instead of the shoe-gripping head 200 being extended over and rigidly secured to the top of the hollow standard it is provided with a shaft 202 mounted to rock in a journal 204 secured to the top of the standard, the rear end of the shaft carrying a forked crank-arm 206 connected to a pivoted rocking-lever 208, which is operated through a roll 209 engaging a peripheral groove in the cam 36. Adjacent the arm 206 a yoke 210, Figs. 1 and 3, is pivotally mounted at its lower end on the rear of the standard, the upper end being formed as an indicating finger 212 co-operating with an indicator plate 215 bolted to the journal 204; the lower end of the yoke is provided with a bent arm 216 carrying a roll 217 which also engages the peripheral groove in the cam 36. The development of this cam-groove and the position of the rolls 209, 217 is shown in Fig. 6. In operation, during the time the gripping members are moved, as described in the said prior Specification, to engage and hold the shoe, which is assumed to be a left one, the roll 209 rides in a straight portion 220<a>, Fig. 6, of the cam groove, but as the last is moved downwards substantially to clear the edge of the shoe counter, the roll passes into the bends 222<a> of the cam groove and the head 200 is rocked, causing the shoe to be stretched and loosened on the last to ease the heel portion of the last out of the shoe. As soon as the last heel clears the shoe counter the rocking movement ceases and the roll 209 passes into a lateral offset straight portion 224<a> of the cam groove to maintain the head 200 laterally inclined while the last is moved diagonally downwards; this causes the lateral pressure of the last against the shoe upper to be substantially the same on the flat undercut inner face as on the outer convex face of the shoe upper. The roll 209 then passes into a central dwell section 220<b> of the cam-groove, at which point the cam 36 ceases to rotate. The roll 217 follows up the roll 209, and when the cam 36 stops, the roll 217 remains in the offset portion 224<a> of the cam groove, causing the pointer 212 to indicate that the machine is conditioned to operate in the next cycle on a right shoe. In this cycle, the lateral offset portion 224b of the cam groove lies to the opposite side of the central line of the groove, as shown in Fig. 6.