Printer Sheet Feeding Speed Control for Multi-Feed Reduction
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Solution Overview
Problem
Existing image forming apparatuses face reduced productivity due to temporary stopping of recording materials by registration rollers, which increases conveyance time and can lead to multi feeding issues with high friction materials like glossy paper, necessitating a method to synchronize image and material timing without stopping the material.
Innovation Solution
An image forming apparatus with a feeding member, conveying member, separation member, detecting unit, and controller that adjusts the speed of the recording material from a first speed to a second speed after detection by the registration sensor to synchronize with the image formation timing, reducing multi feeding and maintaining productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the recording material is temporarily stopped by the registration roller to synchronize timing, then the image and recording material can be aligned properly, but the conveyance time increases and productivity is reduced
Solution Approach 1:
The system performs preliminary detection of the recording material's front end by a registration sensor, and based on this detection, calculates and sets the sheet feeding start timing in advance. This allows the recording material to be fed continuously without temporary stopping, while still achieving proper synchronization at the transfer portion.
Solution Approach 2:
The system dynamically adjusts the sheet feeding speed and start timing based on the detection results. By varying the feeding speed and timing according to the specific recording material type and detection position, the system achieves both proper alignment and continuous conveyance without temporary stops.
2Reliability
If the sheet feeding speed is lowered to reduce multi feeding with high friction materials, then multi feeding occurrence is reduced, but the conveyance time becomes longer and productivity decreases
Solution Approach 1:
The system sets the sheet feeding start timing in advance based on front end detection, allowing optimization of feeding speed. By determining the start timing beforehand, the system can use higher feeding speeds without causing multi feeding, thus maintaining both reliability and productivity.
Solution Approach 2:
The system uses feedback from the registration sensor to detect the recording material's front end position and adjusts the sheet feeding control accordingly. This feedback mechanism allows the system to optimize feeding speed and timing to prevent multi feeding while maintaining high productivity.
3Productivity
If the sheet feeding start timing is set earlier to compensate for lower feeding speed, then productivity can be maintained, but an image interval must be provided to prevent subsequent sheet contact
Solution Approach 1:
The system performs preliminary detection of the recording material's front end and calculates the optimal sheet feeding start timing in advance. This advance calculation eliminates the need for additional image intervals, as the timing is optimized to prevent sheet contact while maintaining continuous conveyance.
Solution Approach 2:
The system replaces the mechanical approach of temporary stopping with a control-based timing adjustment mechanism. By using detection and calculation to determine optimal start timing, the system achieves continuous conveyance without requiring additional mechanical clearance intervals between sheets.
Data Source
AI summary
An image forming apparatus includes a feeding member, a conveying member, and a detecting unit. The feeding member feeds a recording material stacked on a stacking unit. The conveying member convey the fed recording material. The detecting unit detect the conveyed recording material. Where the recording material is a first type, the feeding member feeds the stacked recording material at a first speed, and the conveying member changes the first speed to a second speed that is faster than the first speed before the detecting unit detects the recording material. Where the recording material is a second type that is different from the first type, the feeding member feeds the stacked recording material a third speed that is different from the first speed, and the conveying member changes the third speed to a fourth speed that is different from the third speed after the detecting unit detects the recording material.