Zustellvorrichtung

摘要

989,489. Grinding. H. R. WARSEWA, and K. H. WOLFRAM. Jan. 26, 1961 [Jan. 27, 1960; Jan. 19, 1961], No. 27012/61. Heading B3D. Means for providing the feed of the grinding-wheel 5, Fig. 1, or regulating wheel 4 of a grinding-machine comprises a primary toggle 7 which is disposed between a thrust-receiving member 8 and the support of the regulating wheel or grinding- wheel (the regulating wheel support 3, as shown) and, in order to feed the said support against spring bias, is moved to extended position by a secondary toggle 9 having one arm engaging the toggle 7. In the embodiment of Fig. 1, the machine is a centreless grinder having a regulating wheel 4 carried by the support 3 movable towards the grinding-wheel 5 against the pull of a tension spring 17. The thrust-resisting member 8, with the wheel mounting 3, is coarsely adjusted on the machine bed 1 by a hand wheel 27 and screw 18, with finer adjustment by means of worm gearing 26, 25. A clamping bolt 16 secures the member 8 prior to the use of the toggle feeding device. The screw 18 is first used to bring the work 6 and wheels 4 and 5 into contact. The centre of the toggle 9 is then moved by a piston 13 in an hydraulic cylinder 12 to its straightened position. Precision regulation of the feed is next effected by a slide 10 against which one end of the toggle 7 bears, the slide being moved downwards to actuate the toggle by a wedge 19 which is moved across the end of the slide by screw 20 on a shaft 19 rotatable by either a reversible motor 22 or rotary solenoid and electromagnetic clutch 23 which is engaged and disengaged in sequence to simulate a ratchet motion. If desired, the piston 13 may be changed over to rapid operation during return movement. Fig. 2 shows diagrammatically a second embodiment in which the adjustable mounting is shown at 28 and the slide and wedge arrangement of Fig. 1 is replaced by an hydraulic actuator 29 and the piston-and-cylinder device 13, 12 is replaced by a slidable feed cam 32 operated by a feed cylinder 31, the toggle 9 being maintained in contact with the cam either by a compression spring 1711 or guiding the roller G111 of the toggle 9 in a cam groove. Compression springs 17 ensure the return of the feed slide 28 and maintain all the components of the device in close engagement. The start of the feed motion of the slide is determined by an adjustable stop 34 and stops 30, 33 determine the length of the stroke of the piston in the cylinder 31 and the end of the grinding operation, respectively.