| 摘要 |
Apparatus is described for driving dotting hammers of a matrix printer consisting of a number of electro-magnets mounted in parallel at one side of the printing paper and at the other side of the paper, a number of electro-magnetic plates mounted in parallel to be attracted to said electro-magnets, wherein each plate has a dotting hammer for printing on the paper and wherein the electro-magnetic plates are driven for printing by the magnetic field of the electro-magnets passing through the printing paper. Letter printing on the printing paper is accomplished by dotting. The pitch or spacing arrangement of the paralleled electro-magnets is preferably half of the pitch arrangement of the electro-magnetic plates to be attached.
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