| 摘要 |
<p>An impact dot printer with a print head having a ring-like arrangement of electromagnets (3, 3a, 10) in cooperation with a leaf spring (7) and a ring-shaped permanent magnet (4), a substantially ring-shaped magnetic member (13) is provided radially inside of the arrangement of electromagnets. If an electromagnet is energized, a leakage flux along a closed magnetic path including said magnetic member is established and substantially decreases a leakage flux through the cores of adjacent electromagnets, thus, avoiding the problem of magnetic interference between adjacent electromagents. The magnetic member is preferably provided with a gap giving it a C-shape, in order to avoid eddy currents to flow in the circumferential direction of said magnetic member.</p> |
