Printer Carriage Control System for Stable Positioning
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Solution Overview
Problem
Conventional techniques for controlling the movement of a carriage in serial printers face instability when switching from speed control to position control, affecting the accuracy of ink landing points and overall image formation.
Innovation Solution
A control system that includes a movement mechanism driven by a motor, a detector for position and speed detection, and a controller that switches from speed control to position control at a deceleration start point, maintaining constant speed until then and decelerating to accurately stop at a target position, thereby reducing the influence of speed changes on position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the carriage is decelerated from a first point disposed upstream from the target stop position, then the carriage can be stopped at the target position, but the speed control and position control switching causes instability and affects accuracy
Solution Approach 1:
The control process is segmented into two distinct phases: speed control phase (from start point to deceleration start point) and position control phase (from deceleration start point to target stop position). This segmentation allows each phase to be optimized independently, with speed control ensuring stable motion and position control ensuring accurate stopping, thereby resolving the contradiction between control stability and position accuracy.
Solution Approach 2:
The system performs preliminary speed control to reach a constant speed state before initiating the deceleration phase. By establishing stable speed conditions in advance (from start point to deceleration start point), the system ensures that when position control begins, the carriage is already in a stable state, reducing instability during the transition and improving overall control reliability.
2Manufacturing precision
If the movement control is switched from speed control to position control after deceleration start point, then the carriage can stop at the target position, but the speed changes affect the position control accuracy
Solution Approach 1:
The system performs preliminary speed control to reach a constant speed state before initiating the deceleration phase. By establishing stable speed conditions in advance (from start point to deceleration start point), the system ensures that when position control begins, the carriage is already in a stable state, reducing instability during the transition and improving overall control reliability.
Data Source
AI summary
There is provided control system including: movement mechanism configured so that the movement mechanism is driven by motor; detector configured to detect position and speed of the movable member; and controller. The controller is configured to: control the motor so that the movement mechanism reciprocatively moves the movable member; and in a course to move the movable member to a returning point, control the movement of the movable member by controlling the motor based on the speed of the movable member so that the movable member is moved at a constant speed until a deceleration start point of time, and control the movement of the movable member by controlling the motor based on the position of the movable member so that the movable member is decelerated from the deceleration start point of time and stops at the returning point in accordance with a target position locus.