Abstract: A wire dot printer using fluid ink in which printing is carried out with the ink adhering to the end faces of the wires. A front wire guide guides the end portions of the wires adjacent to the printing end faces of the wires. A rear wire guide is positioned behind the front wire guide. An ink path fed by capillary action is provided between the front and rear wire guides which crosses the wires at positions adjacent the end faces of the wires. Also disclosed is a pump for conveying the ink within the printer and preferred compositions of the ink itself.

Abstract: A speed control for step motors is provided with a speed control circuit for periodically actuating a motor driving circuit at least in part in response to timing signals representative of the incremental advance of the step motor during acceleration. The time interval between the respective actuations of the motor driving circuit during acceleration is stored in a memory, the speed control circuit actuating the motor driving circuit during deceleration of the step motor at intervals which are a function of the stored acceleration intervals in the memory, applied in reverse order.