| 摘要 |
924,617. Reciprocating motors. NASSOVIA WERKZEUGMASCHINENFABRIK G.m.b.H. July 24, 1961 [July 23, 1960], No. 26793/61. Class 35. [Also in Group XXII] Means for oscillating the electrode of a spark erosion machine in its direction of feed comprises an electrode support 5 mounted within a housing 1 on at least two spring elements 11, 12 having an adjustable pre-stress in the direction of oscillation which is produced by an electromagnet 2 through an air gap 8. The support 5 is screwed to an armature 7 or may be integral therewith. Each spring comprises inner and outer tubes 11<SP>1</SP> with intermediate rubber members 11 secured by vulcanizing. The prestressing of the springs to suit the weight of the electrode is adjustable by a ring 4 screwed into the housing and having a pointer 16 co-operating with a scale on the housing.
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