Patent GB-143961-A (GB)
Title: Improvements in and relating to machines for grinding tools and for similar purposes
IPC: B24B3/34
Filed: 1919-02-28
Abstract: 143,961. Heryngfel, S., and Dubreucq, F. Feb. 28, 1919. Disk apparatus; cutting-edges, shaping and treating.-Relates to machines for grinding tools, of the kind having a work-holder providing adjustment about three mutually perpendicular axes, and comprises means whereby the relative grinding and feeding movements between the grinding- disk and the work may both be performed either automatically or by hand; means are also provided whereby form-tools may be ground by the employment of a reproducing-cam. The work-holder comprises a support 57, Figs. 11 and 13, mounted on the slide of the machine and adapted to be adjusted about a vertical axis and set by a scale 59 and a mark 61 on a base 60 and by a spring index pin 83<3> and holes in the base. The support carries a sleeve 62 having on one side an arm 64, and on the other side a sleeve 63; the sleeve 62 is adjustable about an horizontal axis in the support and is set by a scale 65 and a spring index pin 83<2>. The sleeve 62 has therein the hollow shaft 69 of a plate 67 carrying an angularly adjustable tool-holder 68 adapted to hold the tool 66a being ground, and the plate may be set to various angular positions by a spring pin 83 in the sleeve 63 and apertures 71 in the plate. To locate the tool correctly, an abutment member 78 is provided attached to a rod slidably mounted in the hollow shaft 69 and adapted to be pressed outwardly, as shown in dotted lines in Fig. 11, by a spring; after adjustment of the tool, the rod is drawn back by a knob 79 thereon and is held in the retracted position by a pin 80 engaging a boss 81<1>. The support 57 is mounted on a longitudinal carriage 15 and in the construction shown in Fig. 2, the carriage is adapted to be reciprocated on ways on a transverse carriage 14, past the grinding-wheel 54, automatically by means of a rotating crank 42 and a connecting-rod 22, or by hand by means of a lever 21. The transverse carriage 14 is adapted to be fed up to the grinding-wheel automatically by means of ratchet and pawl mechanism operating a screw 55 in engagement with a fixed nut on a pivoting support 13, or by hand by a crank 19; the transverse carriage slides on ways on the pivoting support 13, which may be set angularly by a scale and a mark. The automatic movements originate in a gear-box 20, Figs. 2 and 5, having therein, on the main shaft 24, a worm 28 and a clutch part 29. Movement of a lever 34 brings another clutch part into and out of engagement with the part 29, whereby a flexible shaft 26 may be rotated and drive, through worm gearing mounted in a casing 38 on the carriage 14, the crank 42. The cross-feed is thrown into and out of gear by means of a lever 46, Fig. 5, which moves a worm-wheel 45 into and out of gear with the worm 28, whereby a flexible shaft 25 may be rotated. This shaft connects with ratchet mechanism mounted on the screw 55 and comprising a spindle driven by the shaft and having an eccentric axis 49, Fig. 7, whereby a pawl 50 is oscillated and transmits intermittent rotation, through a ratchet-wheel 51 and worm gearing 52, 53, to the screw 55; the worm wheel 53 may be connected to the screw for automatic feed, or freed therefrom for hand feed, by means of a conical clutch operated by a nut 56 on the screw. The grinding-wheel is mounted on a shaft 10 carried by one of the sleeves of a holder 3 fixed on the table 1, the other sleeve carrying the driving-shaft 24; the part 3 forms a pivot for the arm 4 the height of which can be adjusted by a screw. In order to grind form-tools, the plate 67 is replaced by a plate 85, Fig. 16, having thereon a cam 90 and held in position in the sleeve 62 by a spring 89. The plate is oscillated about its axis by a connecting-rod 88 moved by a rotating crank-pin 92 rotatably mounted in the arm 64; adjustment of the length of the rod serves to adjust the plate angularly. The cam engages a roll 91 mounted in the sleeve 63, and the plate thus has imparted to it oscillating and axial movements. The crankpin 92 is rotated by a flexible shaft 27 from the gear-box 20 driven by the worm-wheel 45; during the employment of the reproducing-cam, the reciprocation of the carriage 15 is stopped. A modified construction of machine for heavier work is shown in Fig. 22, and comprises a grinding-wheel 54<a> mounted on a carriage c adapted to be reciprocated past the tool by means of a cam b. The cam is of stepped formation, whereby different lengths of stroke are obtained, and cooperates with an arm f projecting downwardly from the carriage; the carriage is moved on the return stroke by a spring. In this construction, the adjustments of the tool are the same as those of the first construction and are similarly brought about.