Printing apparatus having high impact erasing mechanism
AssigneeBrother Kogyo Kabushiki Kaisha
InventorHiroki Kawamura
Life of this patent
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Abstract
Upon operation of an erasure key for erasing a printed character, a correction ribbon is moved in an erasure position according to rotation of a motor, and then, the motor is continuously rotated forward at a current I2 larger than a current I1 in a print operation. Therefore, a print hammer is accelerated to a speed V2 higher than a speed V1 in the print operation, to strike a platen at the speed V2. In the erasing operation, no pressing operation is performed after the stroke. Rather, the print hammer is immediately returned and the ink is removed.
Claims16
A printing apparatus for applying an impact between a character and a print medium in response to an input command for one of printing the character and erasing a printed character, comprising:
- selecting means for selecting a character to be printed;
- a print ribbon for transferring ink onto the print medium in a shape corresponding to the character by application of an impact by the character selected by said selecting means;
- a correction ribbon for removing, from the print medium, ink transferred onto the print medium;
- a hammer which is driven to apply the impact between the character and the print medium;
- an association mechanism;
- a cam unit including hammer driving means for driving said hammer via said association mechanism;
- drive means for driving said cam unit;
- a print ribbon mechanism for positioning said print ribbon between the character and the print medium in a print operation;
- a correction ribbon mechanism for positioning said correction ribbon between the character and the print medium in an erasing operation;
- and
- control means for controlling said drive means to drive said cam unit at a print speed upon reception of a print command and to drive said cam unit by a predetermined amount in a first direction after said hammer is driven by said cam at said print speed, said control means controlling said drive means to drive said cam unit at an erasure speed higher than the print speed upon reception of an erasure command and to bring said cam unit to a halt without further driving said cam unit after said hammer is driven by said cam unit at said erasure speed.
A printing apparatus for applying an impact between a character and a print medium in response to an input command for one of printing the character and erasing a printed character, comprising:
- a hammer which is driven to apply the impact between the character and the print medium;
- a cam unit including hammer driving means for driving said hammer;
- drive means for driving said cam unit;
- and
- control means for controlling said drive means to drive said cam unit at a print speed upon reception of a print command and to drive said cam unit by a predetermined amount in a first direction after said hammer is driven by said cam unit at said print speed, said control means controlling said drive means to drive said cam unit at an erasure speed higher than said print speed upon reception of an erasure command and to bring said cam unit to a halt without further driving said cam unit after said hammer is driven by said cam unit at said erasure speed.
Dependencies are inferred from the claim text.