Title:
PRINT CONTROLLER
Document Type and Number:
WIPO Patent Application WO/1991/017892
Kind Code:
A1
Abstract:
In response to an encoder pulse signal (501) synchronized with the rotation of a carriage motor (4), a print controller (A) produces a print command (301) for a print head (7) while moving the head (7) by a belt (10) connected to the motor (4). The print controller (A) comprises a unit (1) that detects the moving speed of the printer head (7), and units (2 and 3) that correct the timing for generating the print command (301) in relation to both the amount of expansion or contraction of the belt at a moving speed that is detected and the flight time. The controller (A) further has a unit (15) that discriminates whether the printer head (7) is accelerating or decelerating. The result of discrimination of the unit (15) is given to the correction units (2 and 3) to correct the timing by different amounts depending upon whether the printer head (7) is being accelerated or decelerated. In correcting the timing, the offset time is introduced having a relationship of inverse proportion relative to the moving speed of the printer head (7), such that the print command (301) is generated behind the encoder pulse signal (501) even during the acceleration or deceleration. Furthermore, a unit (14) is employed to so control the carriage drive motor (4) that the acceleration of the printer head (7) changes continuously.
Inventors:
TANAKA HIROTOMO (JP)
Application Number:
PCT/JP1991/000642
Publication Date:
November 28, 1991
Filing Date:
May 15, 1991
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
International Classes:
B41J19/20; (IPC1-7): B41J19/18
Foreign References:
| JPH0270470A | 1990-03-09 | |||
| JPH01291970A | 1989-11-24 | |||
| JPH02261678A | 1990-10-24 | |||
| JPS6357269A | 1988-03-11 |
Other References:
See also references of EP 0483371A4
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