DC motor control circuit

A DC motor control circuit, comprising:

• a rotational signal output circuit detecting a rotation of a DC motor, that is controlled by a control unit to attain a relative movement between a print head and a recording medium, and outputting a rotation signal indicative of the detected rotation;
• an operation signal output circuit receiving the rotation signal and outputting an operational signal, the operational signal including a movement direction signal indicative of a direction, in which the relative movement is attained between the print head and the recording medium, and a movement amount signal indicative of an amount of the relative movement between the print head and the recording medium;
• a controlled movement amount count circuit counting a movement amount value, controlled to be attained onto the relative movement, based on the movement amount signal;
• an actual movement amount count circuit counting an actual movement amount, by which the relative movement is actually performed, based on the movement amount signal, by incrementing the actual movement amount based on the movement amount signal when the movement direction signal indicates the same direction with a controlled direction signal that is issued from the control unit and that is indicative of the direction in which the control unit controls the attain the relative movement, and by decrementing the actual movement amount based on the movement amount signal when the movement direction signal indicates the opposite direction from the controlled direction signal;
• a reset circuit resetting the value counted by the controlled movement amount count circuit and the value counted by the actual movement amount count circuit when the value counted by the actual movement amount count circuit reaches a second predetermined value;
• and
• a stopped condition signal output circuit outputting, to the control unit, a signal indicating that the relative movement is topped, when the value counted by the controlled movement amount count circuit reaches a third predetermined value that is greater than the second predetermined value.

A DC motor control device for controlling a DC motor, comprising:

• a control unit controlling rotation of a DC motor to attain a relative movement between a print head and a recording medium;
• a rotational signal output circuit detecting the rotation of the DC motor, that is controlled by the control unit to attain the relative movement, and outputting a rotation signal indicative of the detected rotation;
• an operation signal output circuit receiving the rotation signal and outputting an operational signal, the operational signal including a movement direction signal indicative of a direction, in which the relative movement is attained between the print head and the recording medium, and a movement amount signal indicative of an amount of the relative movement between the print head and the recording medium;
• a position output circuit receiving the operational signal and outputting a positional value indicative of the relative position between the print head and the recording medium;
• a comparing circuit comparing the positional value with a first predetermined value, and outputting a matching signal when the positional value is matched with a first predetermined value;
• a switch circuit receiving the matching signal, and switching from outputting of a drive signal for driving the DC motor to outputting of a stop signal for stopping the DC motor;
• a controlled movement amount count circuit counting a movement amount value, controlled to be attained onto the relative movement, based on the movement amount signal;
• an actual movement amount count circuit counting an actual movement amount, by which the relative movement is actually performed, based on the movement amount signal, by incrementing the actual movement amount based on the movement amount signal when the movement direction signal indicates the same direction with a controlled direction signal that is issued from the control unit and that is indicative of the direction in which the control unit controls to attain the relative movement, and by decrementing the actual movement amount based on the movement amount signal when the movement direction signal indicates the opposite direction from the controlled direction signal;
• a reset circuit resetting the value counted by the controlled movement amount count circuit and the value counted by the actual movement amount count circuit when the value counted by the actual movement amount count circuit reaches a second predetermined value;
• and
• a stopped condition signal output circuit outputting, to the control unit, a signal indicating that the relative movement is stopped, when the value counted by the controlled movement amount count circuit reaches a third predetermined value that is greater than the second predetermined value.

A printer, comprising:

• a print head performing a printing operation onto a recording medium;
• a DC motor rotating to attain a relative movement between the print head and the recording medium;
• a control unit controlling the rotation of the DC motor;
• a rotational signal output circuit detecting the rotation of the DC motor, and outputting a rotation signal indicative of the detected rotation;
• an operation signal output circuit receiving the rotation signal and outputting an operational signal, the operation signal including a movement direction signal indicative of a direction, in which the relative movement is attained between the print head and the recording medium, and a movement amount signal indicative of an amount of the relative movement between the print head and the recording medium;
• a controlled movement amount count circuit counting a movement amount value, controlled to be attained onto the relative movement, based on the movement amount signal;
• an actual movement amount count circuit counting an actual movement amount, by which the relative movement is actually performed, based on the movement amount signal, by incrementing the actual movement amount based on the movement amount signal when the movement direction signal indicates the same direction with a controlled direction signal that is issued from the control unit and that is indicative of the direction in which the control unit controls to attain the relative movement, and by decrementing the actual movement amount based on the movement amount signal when the movement direction signal indicates the opposite direction from the controlled direction signal;
• a reset circuit resetting the value counted by the controlled movement amount count circuit and the value counted by the actual movement amount count circuit when the value counted by the actual movement amount count circuit reaches a second predetermined value;
• and
• a stopped condition signal output circuit outputting, to the control unit, a signal indicating that the relative movement is stopped, when the value counted by the controlled movement amount count circuit reaches a third predetermined value that is greater than the second predetermined value.

A DC motor control circuit, comprising:

• a rotational signal output circuit detecting a rotation of a DC motor, and outputting a rotation signal indicative of the detected rotation;
• an operation signal output circuit receiving the rotation signal and outputting an operation signal, the operational signal including a movement direction signal indicative of a direction, in which the relative movement is attained between the print head and the recording medium, and a movement amount signal indicative of an amount of the relative movement between the print head and the recording medium;
• a first movement amount count circuit counting a first movement amount value of the relative movement by simply incrementing the first movement amount value based on the movement amount signal;
• a second movement amount count circuit counting a second movement amount of the relative movement based on both of the movement amount signal and the movement direction signal;
• a rest circuit resetting the value counted by the first movement amount count circuit and the value counted by the second movement amount count circuit when the value counted by the second movement amount count circuit reaches a second predetermined value;
• and
• a stopped condition signal output circuit outputting a signal indicating that the relative movement is stopped, when the value counted by the first movement amount count circuit reaches a third predetermined value that is greater than the second predetermined value.