Carriage Vibration Convergence in Image Scanners
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Solution Overview
Problem
In image reading apparatuses, the carriage vibration caused by sudden stops at standby positions leads to increased image reading time due to the need for convergence time before stable reading can commence, especially when switching between automatic document feeding and fixed document reading modes.
Innovation Solution
The carriage is moved to acceleration starting positions before an image reading signal is acquired, allowing vibration convergence, and then directly moved to reading positions upon signal, optimizing the position control to reduce image reading time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the carriage returns to the standby position after shading processing, then the carriage can be positioned for the next operation, but the carriage vibrates due to sudden stop and requires convergence time which deteriorates image reading time
Solution Approach 1:
The carriage is moved to an intermediate position before the standby position after shading processing, allowing vibration to converge before the final positioning. This preliminary movement separates the vibration convergence phase from the final positioning phase, eliminating the need to wait for vibration to settle at the standby position while maintaining reliable positioning for the next operation.
Solution Approach 2:
The carriage movement is divided into multiple segments: first moving to an intermediate position, then to the final reading position. This segmentation allows the vibration convergence to occur during the transition to the intermediate position, rather than requiring waiting time at the final position, thus reducing overall image reading time while ensuring stable positioning.
2Measurement precision
If the carriage is moved from standby position to image reading position for shading processing, then accurate reading can be performed, but the carriage must return to standby position creating vibration and time loss
Solution Approach 1:
The carriage performs shading processing at the intermediate position rather than returning to the standby position. This preliminary action at the intermediate position eliminates the need for the return trip that causes vibration and time loss, while still maintaining the necessary shading processing accuracy for precise reading.
Solution Approach 2:
The functions of vibration convergence and positioning are merged into a single continuous movement to the intermediate position, rather than being separate steps. This combining of functions eliminates idle time and vibration convergence waiting time, improving overall image reading efficiency while maintaining measurement precision through proper positioning.
Data Source
AI summary
An image reading apparatus comprises an automatic document feeding section automatically feeding a document to a specific automatic document reading position; an automatically fed document detection section detecting whether or not there is a document in the automatic document feeding section; a fixed document detection section detecting whether or not there is a fixed document placed on an original table glass; a drive section driving the carriage in the vertical scanning section; and a carriage movement control section moving the carriage in advance from the initial standby position of the carriage to a movement starting end position across the initial standby position facing an automatically fed document reading position where an automatically fed document is read or a fixed document reading starting position where the reading of a fixed document is started if the automatically fed document detection section or the fixed document detection section detects a document.