Inkjet Head Gap Detection With Backlash Phase Shift Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inkjet recording apparatuses face challenges in accurately adjusting the gap between the sheet and the inkjet head due to detection accuracy issues caused by backlash in gear trains, particularly when dealing with varying sheet thicknesses.
Innovation Solution
A detection system that includes a first rotating member with a gear train transmitting a driving force to a second rotating member, where the output value of the detection device monotonically increases or decreases with the rotation angle, and a control part calculates the driving amount of the first rotating member to correct for phase shifts, ensuring high accuracy in gap adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gear train is used to transmit driving force from the first rotating member to the second rotating member, then the detection system can detect the operating amount of the adjustment member, but detection accuracy is lowered due to backlash of the gear train
Solution Approach 1:
The patent replaces the mechanical gear train transmission with a direct detection approach. The detection device detects the operating amount of the adjustment member directly without relying on gear train transmission, thereby eliminating backlash errors. The control part calculates the position of the inkjet head based on the detected operating amount and the relationship between the adjustment member and inkjet head, substituting mechanical transmission with a calculation-based approach.
2Manufacturing precision
If the position of the inkjet head is adjusted according to sheet thickness, then image quality is improved, but detection accuracy is compromised due to backlash in the adjustment mechanism
Solution Approach 1:
The patent implements a feedback mechanism where the detection device continuously detects the operating amount of the adjustment member, and the control part calculates the actual position of the inkjet head based on this feedback. The system uses the detected operating amount to determine the sheet thickness and adjust the inkjet head position accordingly, creating a closed-loop control system that compensates for mechanical backlash through calculation rather than relying solely on mechanical precision.
Data Source
AI summary
A detection system includes a detection target device, a detection device, and a control part. The detection target device is provided with a first rotating member rotating around a first shaft. The detection device is provided with a second rotating member rotating around a second shaft by a driving force transmitted from the first rotating member through a gear train, and its output value monotonically increases or decreases according to a rotation angle of the second rotating member. The control part calculates a driving amount of the first rotating member for correcting an output value of the detection device from a phase shift of an output value of the detection device when a rotation direction of the first rotating member is changed.