| 摘要 |
A pen recorder has a carriage movable across a sheet of print paper and supporting a rotatable drum with a plurality of pen units mounted thereon. The carriage is movable between a pair of side frames through a print region and a nonprint region. When the carriage is moved by a stepper motor into abutment against one of the side frames which provides a stopper position, the relationship between the phase of the stepper motor and the position of the carriage is determined. Each time a print cycle is finished, the carriage is returned to a home position which is at the other end of the nonprinting region. A desired pen unit can be selected by reciprocating the carriage in an interval within the nonprint region, the interval being spaced from a preset number of increments of angular movement of the stepper motor.
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