| 摘要 |
A magnetizable powder applicator arrangement in a printing or display apparatus employing for example a magnetizable drum. The powder is attracted to the outer surface of a nonmagnetizable tube which contains therein a rotatable row of bar magnets having like poles adjacent. The divergent flux field set up by the rotating magnets causes the powder to creep along the surface of the tube in a direction opposite the magnet rotation, and onto a ledge of nonmagnetizable material. The ledge is sufficiently close to the drum, yet sufficiently far from the flux field, for the powder to be attracted to the drum surface without disturbing the selective magnetization thereon.
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