| 摘要 |
PCT No. PCT/FI80/00005 Sec. 371 Date Jul. 1, 1981 Sec. 102(e) Date Jul. 1, 1981 PCT Filed Nov. 5, 1980 PCT Pub. No. WO81/01303 PCT Pub. Date May 14, 1981.The speed of feed movement of a piston is controlled to an essentially constant value by direct digital measurement of the actual speed, by comparing the actual value to a preset value and by compensating for differences therebetween. Variations in the piston feed pressure and in the grinding power are taken into account by means of additional signals related to these factors and added to or subtracted from the signal representing the actual value of the speed of the piston. |
