| 摘要 |
Four hammers are spaced 90 DEG apart about an axis along which a workpiece is movable. The hammers extend radially to the axis and are intended to carry at their free ends respective tools. Each of the tools comprises a block having the general shape of a quadrangular prism which has four longitudinal side faces. The block has a central web, which forms a narrow section of one of the longitudinal side faces and extends from one end of the block approximately over one half of the length thereof. The one longitudinal side face has a working face section which is wider than the narrow section and extends from the latter to the opposite end of the block and slopes symmetrically to the two longitudinal side faces which are adjacent to the one longitudinal side face. The web has two side faces, each of which has in a view on the one longitudinal side face a contour which corresponds to one-half of the contour of the working face secton in a view on the other end of said block.
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