Sheet Feeding Roller Sensing for Compact High-Speed Separation
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Solution Overview
Problem
Existing sheet feeding apparatuses require multiple sensors for detecting sheet presence and position, leading to increased size, cost, and complexity, and they struggle with maintaining optimal sheet intervals for enhanced productivity.
Innovation Solution
A sheet feeding apparatus with a supporting unit, a feeding unit, a separation unit, a moving member, and two sensors to detect sheet presence and timing, allowing for compact design and improved productivity by controlling feeding timing based on sensor detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two sensors (sheet placement sensor and sheet leading-edge position sensor) are used to detect sheet presence and position, then detection accuracy is improved, but apparatus size and cost increase
Solution Approach 1:
The patent combines the functions of sheet presence detection and sheet leading-edge position detection into a single sensor system. The sheet feeding roller serves as both the detection point for sheet presence and the reference point for leading-edge position, eliminating the need for separate sensors while maintaining detection accuracy.
Solution Approach 2:
The single sensor positioned at the sheet feeding roller performs multiple functions: detecting whether a sheet is present on the platen and detecting when the leading edge of the sheet reaches the feeding position. This multi-functional approach reduces the total number of sensors required in the apparatus.
2Reliability
If traditional sensor placement is used, then reliable sheet detection is achieved, but apparatus size increases
Solution Approach 1:
The patent merges the detection functions into a single location (the sheet feeding roller area), reducing the spatial footprint required for sensor placement while maintaining reliable detection of both sheet presence and leading-edge position.
3Productivity
If sheet interval is shortened to enhance productivity, then output increases, but sheet separation difficulty increases
Solution Approach 1:
The system performs preliminary detection of the sheet leading edge position before feeding begins. By detecting when the leading edge reaches the feeding roller and controlling the start timing accordingly, the system ensures proper sheet separation even at high speeds with shortened intervals between sheets.
Solution Approach 2:
The sensor provides real-time feedback on sheet leading-edge position to the control unit, which adjusts the feeding timing accordingly. This feedback mechanism ensures reliable sheet separation by synchronizing the feeding action with the actual sheet position, enabling high-speed operation without compromising separation reliability.
Data Source
AI summary
A sheet feeding apparatus includes a supporting unit, a sheet feeding unit, a separation unit, a moving member, a first sensor, and a control unit. The moving member is configured to move by being pushed by the sheet supported by the supporting unit. The first sensor is configured to detect the sheet based on a position of the moving member. The second sensor is configured to detect the sheet at a position downstream of the separation unit in the feeding direction. The control unit is configured to determine an existence of the sheet supported by the supporting unit based on a detection result of the first sensor, and to control feeding timing at which the sheet feeding unit starts to feed the sheet based on detection results of the first sensor and the second sensor.