| 摘要 |
A serial printer comprising a print wheel having numerous type bearing spokes, each of which extends radially and which is provided with a type element on the tip of the spoke, a stepping motor for rotating the print wheel, a print hammer for striking the desired spoke behind the type element during printing operation, a positioning means for guiding a selected type element to a printing point during the striking operation of the print hammer, and a control circuit for regulating the driving of the stepping motor and the print hammer. The control circuit causes the stepping motor to move the selected type element to a position whereat the type element is struck by the print hammer. The control circuit suspends the energize-hold operation of the stepping motor at the moment that the type element is struck by the print hammer. This invention accurately positions the type element for substantially aligned printing operation, and greatly reduces damage to the spokes due to material fatigue.
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