Position Detection Device Original Point Timing
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Solution Overview
Problem
In printing apparatuses, accurately setting the original point (reference position) for the print head is challenging due to deviations in detection timing, leading to potential deviations in print position and quality.
Innovation Solution
A position detection device with a linear encoder and scale sensor, where the output change points from light shielding and transmission sections are used to set the original point, comparing duration times to determine the correct timing for setting the reference position, ensuring accurate alignment and minimizing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the original point is set based on a simple output change point from the linear sensor, then the device complexity is reduced, but the measurement precision deteriorates due to detection timing deviations
Solution Approach 1:
The patent segments the detection process into multiple distinct timing points: light transmission timing (when light passes through), light shielding timing (when light is blocked), and detection timing (when the sensor detects the original point). By dividing the detection into these segments and using their temporal relationships, the system achieves high precision without increasing overall device complexity
Solution Approach 2:
The patent uses feedback by comparing the duration time between detection timing and light transmission timing (D1) with the duration time between detection timing and light shielding timing (D2). This feedback mechanism allows the system to determine the correct original point position based on timing relationships, improving measurement precision while maintaining simple device structure
2Ease of operation
If the original point setting method is simplified, then the ease of operation is improved, but the manufacturing precision deteriorates due to positional deviations
Solution Approach 1:
The patent performs preliminary action by establishing clear timing relationships before actual printing operations. The system pre-determines the original point position by comparing duration times D1 and D2, and pre-sets the original point based on whether D1 > D2 or D1 < D2. This preliminary setup ensures high manufacturing precision during subsequent printing operations without complicating the operation process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method ensures precise setting of the original point, preventing deviations and resulting in high-definition prints with no blurring or positional errors, enhancing the quality and accuracy of the printing process.
Implementation Method 1
a linear encoder which has a linear scale and a scale sensor and detects an amount of movement of the moving body in one direction; and in a case where an output change point that the scale sensor detects switching from the first section to the second section is set as a light transmission timing, an output change point that the scale sensor detects switching from the second section to the first section is set as a light shielding timing
Data Source
AI summary
Provided are a position detection device, a printing apparatus equipped with the position detection device and a position detection method which make it possible to set an original point on a deviation-free appropriate position with no need of highly accurate adjustment of built-in positions of a linear encoder and an original point sensor. In a case where a point that low-to-high switching of an output from a scale sensor is detected is set as a light transmission timing, a point that high-to-low switching of the output is detected is set as a light shielding timing and an output change point that an original point sensor detects is set as a detection timing, in a duration time D1 which lasts from the detection timing to a first light transmission timing which is the closest to the detection timing and a duration time D2 which lasts from the detection timing to a first light shielding timing which is the closest to the detection timing, when the duration time D1>the duration time D2, a position of a moving body which is obtained at a second light transmission timing is set as an original point and when the duration time D1<the duration time D2, the position of the moving body which is obtained at a second light shielding timing (the first light shielding timing) is set as the original point.