Improvements in Cutlery Grinding Machines

12,587. Joy, C. L. May 24. Disk and wheel apparatus. - Relates to cutlery grinding machines of the type having a pivotal plate 3 carrying a reciprocating knifeholder carriage 6, and a cam drum 34 having peripheral cams 92 adapted to move the carriage by means of the lever 50 to bring the shoulder of the knife 10 opposite the edge of the grinder 11, then to swing the pivotal plate by means of the lever 40 to bring the knife into contact with the grinder and to move the carriage and the knife across the grinder; and consists in providing an adjustable stop 98 against which the knife-holder carriage contacts at the end of its travel to ensure its coming into the same relative position with the grinder after every reciprocation, and means for adjusting the automatic movements of the carriage, and for adjusting the grinder for wear. The lever 40 moving the pivotal plate is operated by an adjustable cam on the end of the drum 34, and is locked in its operative position by a lever 44 having a notch with which the end 42 of the lever 40 engages; the lever 44 is operated by an adjustable cam on the drum to release the lever 40, which swings back under the influence of a spring 49 and allows the plate 3 to return to its idle position. The number of revolutions of the cam-drum is regulated by a scroll-cam 85, Fig. 8, on the shaft 35 carrying the cam-drum, which scroll is engaged by the end of a lever 83 pivoted on an arm 82. This arm, together with a treadle 73, a belt-shifter 81, and a spring-actuated arm 91, is mounted on a rod 73. On the depression of the treadle, the arm 82 is swung back, and the lever 83 moves to the right under spring influence to the degree allowed by the adjustable screw 87, and enters the scroll. In this position, the belt-shifter 80 is holding the belt on the tight pulley, and it remains there until the lever 83 escapes from the scroll on the completion of the desired number of revolutions.' The means for adjusting the grinder for wear comprise a sliding box 21, in which the grinder-shaft 17 is journaled with no longitudinal movement, and which box has a threaded U-shaped extension 24 embracing the shaft 17, through which longitudinal adjustment is given to the box 21 by means of a hand-wheel 25.