| 摘要 |
1,174,608. Grinding. MID-WEST ABRASIVE CO. 29 March, 1967 [12 Dec., 1966], No. 14369/67. Heading B3D. [Also in Division G1] A grinding machine comprises a grinding wheel G which is automatically traversed backwards and forwards over a workpiece (F) between points determined by the settings of potentiometers in an electric correspondence control system (see Division G1). The grinding wheel is carried by a boom and is displaceable vertically by an hydraulic cylinder 78 and horizontally in a direction at right angles to the traversing movement by a cylinder (40) acting via a movement-doubling rack-andpinion arrangement (44-48), Fig. 2 (not shown). The carriage is driven in the traversing direction by a rotary hydraulic motor (150), the position of the carriage being sensed by a potentiometer (194), the wiper of which is connected to a gear 200 co-operating with a rack 202.
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