Sheet Conveying Tray Sensor Checks for Foreign Objects and Abnormal Sheets
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Solution Overview
Problem
Existing sheet conveying devices struggle with detecting foreign objects on the conveying tray and abnormal sheet conditions during the conveying process, which can lead to damage to the device and paper jams.
Innovation Solution
A sheet conveying device equipped with a sensor to detect foreign objects on the tray before raising it and another sensor to detect abnormal sheet conditions during conveyance, along with a control system to adjust the tray's position and halt the conveyance process if abnormalities are detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the conveying tray is raised to the conveying position, then the sheet can be conveyed along the conveyance path, but foreign objects on the tray may be damaged or cause paper jams
Solution Approach 1:
The sensor detects foreign objects on the conveying tray before the tray is raised to the conveying position. The determination processing portion identifies foreign objects by detecting changes in the sensor output signal during the raising process, allowing preventive action to be taken before damage can occur.
Solution Approach 2:
The sensor provides continuous feedback on the conveying tray status during the raising process. The determination processing portion monitors the sensor output signal changes to detect foreign objects, enabling real-time detection and prevention of harmful effects.
2Object-affected harmful factors
If the sensor detects foreign objects during the raising process, then damage can be prevented, but the conveying process may be delayed
Solution Approach 1:
The system performs foreign object detection during the tray raising process before sheet conveying begins. By completing the detection action in advance, the actual conveying process is not delayed, as the sensor monitoring occurs concurrently with the raising motion rather than requiring a separate detection phase.
3Productivity
If the tray raising speed is increased, then productivity is improved, but the risk of damaging foreign objects increases
Solution Approach 1:
The sensor detects foreign objects during the tray raising process, allowing the control system to identify and halt the raising motion before foreign objects are damaged. This enables high-speed conveying to be maintained by ensuring foreign object detection occurs in advance of any potential damage.
Data Source
AI summary
A sheet conveying device according to this disclosure includes a conveying tray onto which a sheet is loaded, a conveying mechanism, a raising and lowering mechanism, a raising and lowering control portion, a sensor, a first determination processing portion, and a second determination processing portion. The raising and lowering control portion drives the drive portion and controls raising and lowering of the conveying tray. The first determination processing portion determines on the basis of an output signal of the sensor whether or not a foreign object other than the sheet is present on the conveying tray while the raising and lowering control portion is raising the conveying tray before the conveying mechanism conveys the sheet. The second determination processing portion determines, on the basis that the output signal of the sensor changes while the conveying mechanism is conveying the sheet, that the sheet being conveyed is abnormal.