Patent GB-448869-A (GB)
Title: Improvements in or relating to machines for operating upon heels
IPC: A43D87/00
Filed: 1934-12-13
Abstract: 448,869. Wood-heel concaving-machines. BRITISH UNITED SHOE MACHINERY CO., Ltd., Union Works, Belgrave Road, Leicester.-(United Shoe Machinery Corporation; 140, Federal Street, Boston, U.S.A.) Dec. 13, 1934, No. 35754. [Class 145 (i)] The invention comprises improvements in the jack and in the loading mechanism of heelconcaving machines of the type wherein the heel blank is held by a jack with its attaching face downwards upon a table and is automatically slid and turned over a cutter projecting through an opening in the table, with the periphery of the blank in contact with a gauge, to form a concaved attaching face upon the heel blank. The machine frame 10, Fig. 2, has a vertical shaft upon which the jack arm 14 is pivoted, being urged against a screw stop 16 by a spring 18. The arm 14 carries a gear-box 20 containing an ovoid gear 22; rollers 26, 28 engage the exterior of the flange 24 on the gear, while a roller 40 engaging the interior of the flange is mounted on a shaft 42 carried by a lever 44 pivoted to the gear-box 20 and acted on by a spring 48. The gear is rotated by a pinion 34. A compound slide 54, 58 provided on a stub shaft 50 depending from the underside of the gear 22 carries the jack. The jack comprises levers 64, 66, Fig. 8 ; the lever 66 is provided with rigid fingers 68 to engage the heel blank ; the lever 64 is provided with a rigid finger 68 and a finger 70 resiliently mounted as in Fig. 10. The levers 64, 66 are pivoted on depending pins 60, 62 and at their inner ends carry rolls 84 co-operating with a bar 88 by which the jack is actuated. The bar 88 has surfaces 90 on which the rolls 84 rest when the jack is open, connected by diverging surfaces 92 with surfaces 94 against which the rolls 84 rest when the jack is closed; the thrust in this position is normal to the cam surface, so that there is no tendency for the bar 88 to move. The end 108 of the bar 88 ejects the blank when the bar is moved to open the jack. The bar 88 has shoulders at each end to limit its movement in the guide 89 which has fingers 106 serving as abutments for the breast of the heel blank. The levers 64, 66 are pulled together by a spring 83. The cam bar 88 carries a roll 96 engaging a notch 98 in a lever 99 pivoted at 100 to the jack arm, the ends of the lever 99 carrying rolls 102, 104. During the operation of the machine, the jack is opened and closed by these rolls 102, 104 striking an abutment 110, Fig. 2, carried by a lever 112 pivoted at 114 to a lug 113 on the gear-box 20, and acted upon by a spring 116 connected to an arm 118, Fig. 4, which can be clamped in adjusted position on the pivot 114. The loading mechanism comprises an arm 130, Fig. 4, having a heel blank back gauge 142<1> and a finger 144 to hold the blank down on the table 15. The arm 130 is pivoted at 132 to an adjustable slide 148, and is normally held in retracted position by a spring 134; the inner end of the arm 130 is resiliently connected to an arm 140 pivoted at 138 and carrying a lever 136 which is struck by a finger on the jack just before the clamping fingers thereon close, whereby the arm 130 is operated to carry a blank into the path of the jack. As it approaches the jack, the arm 130 acts on a rod 152 mounted in a guide 150 on the slide 148, so compressing the spring 154. This arrangement ensures that the loading arm is quickly retracted from the path of the jack, and prevents damage if the spring 134 should break. The latter may be relatively weak ; the return of the arm 130 is cushioned by a dashpot 146. The edge of the blank is guided by a gauge 158 during its movement over the cutter 156, Fig. 2.