Sheet Conveyance Position Correction Using Index Reference
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Solution Overview
Problem
Existing sheet conveying devices in image forming apparatuses face challenges in accurately correcting the position of sheets due to positional deviations caused by the movement of contact image sensors (CIS) during maintenance or operation, leading to reduced accuracy in sheet position correction.
Innovation Solution
The implementation of a sheet conveying device that includes a position detector, a data storing device, a conveyance positional deviation calculator, and a reference position corrector, which calculates and corrects positional deviations based on a reference sheet conveyance position, using an index mounted on a fixed body to maintain accurate sheet positioning despite CIS movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contact image sensors (CIS) are mounted on a movable body for maintenance access, then ease of operation is improved, but measurement precision deteriorates due to positional deviations during movement
Solution Approach 1:
The system performs preliminary detection of the CIS position using the index mark before sheet position measurement. By detecting the CIS position in advance and storing it as reference data, the system compensates for positional deviations that occur during movable body movement, thereby maintaining measurement precision while allowing ease of operation
Solution Approach 2:
The system implements feedback by continuously monitoring the CIS position through index mark detection and using this information to correct sheet position measurements. The detected positional deviation is fed back to adjust the measurement results, ensuring accuracy is maintained despite movements of the movable body
2Adaptability or versatility
If the position detector is mounted on a movable body, then adaptability is improved, but reliability deteriorates due to positional instability
Solution Approach 1:
The index mark serves as an intermediary reference element between the movable body and the fixed reference frame. By detecting the position of the index mark on the movable body, the system establishes a reliable reference that compensates for movements, thereby maintaining detection consistency while preserving positioning flexibility
Solution Approach 2:
The system creates a copy of the reference position information by detecting and storing the index mark position. This copied reference data is then used to correct subsequent measurements, ensuring reliability is maintained even when the movable body changes position
Data Source
AI summary
A sheet conveying device, which is included in an image forming apparatus and a post processing device, includes a position detector configured to detect a position of a sheet, a sheet conveying body, a fixed body, a movable body configured to move, relative to the fixing body, between a first position and a second position different from the first position, and an index mounted on the fixed body. The sheet conveying device further includes a data storing device, a conveyance positional deviation calculator configured to calculate a positional deviation amount of the sheet to the reference sheet conveyance position, a detected positional deviation calculator configured to calculate a positional deviation amount of the position detector to the index based on a result of the position detector, and a reference position detector configured to correct the reference sheet conveyance position based on a result of the detected positional deviation calculator.