Recording device with a controllable carriage driving motor
AssigneeCanon Kabushiki Kaisha
InventorNoriaki Itoh
Life of this patent
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Abstract
A recording device performs recording by reciprocating a carriage mounting a recording head by a stepping motor. The recording head includes a rotation position detector for detecting a rotation position of a rotor of the stepping motor, a controller for performing closed-loop driving of a switching timing of an exciting current of the stepping motor according to a detection signal from the rotation position detector, and a motor speed control circuit for controlling a rotation speed of the stepping motor according to the detection signal from the rotation position detector. The device performs stationary confirmation whether the switching timing of the stepping motor is normally performed via the controller.
Claims8
A recording apparatus comprising:
- a recording head;
- a carriage for carrying said recording head;
- a stepping motor for driving said carriage, said stepping motor including a rotor and a coil;
- detection means for generating pulse signals corresponding to rotation of said rotor of said stepping motor;
- speed control means for generating a control output for controlling a speed of said stepping motor, the control output being generated in correspondence to a time interval between the pulse signals from said detection means;
- control means for outputting an initializing signal when the control output from said speed control means exceeds a predetermined level;
- and
- current switching means for counting the pulse signals from said detection means and switching an exciting current supplied to said coil of said stepping motor in accordance with the count value, wherein said current switching means stops the switching control of the exciting current in accordance with initializing signals from said control means, keeps the exciting state of the current and resets the count value by setting said rotor to a stable position, then restarts the switching control of the exciting current.
A recording apparatus comprising:
- a recording head;
- a carriage for carrying said recording head;
- a stepping motor for driving said carriage, said stepping motor including a rotor and a coil;
- detection means for detecting a rotation angle of said rotor of said stepping motor, said detection means generating a pulse signal at every interval of rotation of a predetermined angle of said rotor;
- speed control means for generating a control output for controlling a speed of said stepping motor, the control output being generated in accordance with a time interval between the pulse signals from said detection means;
- control means for outputting an initializing signal when the control output from said speed control means exceeds a predetermined level;
- and
- current switching means for counting the pulse signals from said detection means and generating a count value, and performing a switching control of an exciting current supplied to said coil of said stepping motor when the count value and a set value reach a predetermined relationship, said current switching means resetting the set value set in said current switching means according to the initializing signal from said control means.
Dependencies are inferred from the claim text.