Sheet Feed Device Serial Signal Conversion for Cassette Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for detecting the open/closed state of a paper stack cassette in sheet feed devices increase power consumption during energy saving mode and require a large number of signal lines, leading to higher costs.
Innovation Solution
A sheet feed device with a detection switch unit, a second detection unit, a signal conversion unit, and a communication line that converts detection signals into serial signals, allowing the first detection unit to receive information directly from the signal conversion unit during energy saving mode, reducing power consumption and signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If controllers of sheet feed devices are operated during energy saving mode to detect open/closed state of paper stack cassettes, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between two detection modes based on operational state: during active operation, the controller operates fully for comprehensive detection via communication line; during energy saving mode, it transitions to a simplified detection mode using direct signal lines from detection switches, reducing power consumption while maintaining essential detection functionality
Solution Approach 2:
The detection system is segmented into two independent pathways: a primary pathway using the communication line between controllers for full functionality, and a secondary pathway using direct signal lines from detection switches to the first detection unit for energy-saving operation. This segmentation allows selective activation based on power requirements
2Use of energy by moving object
If direct signal lines are added from detection switch units to the first detection unit to enable energy saving mode detection, then power consumption is reduced, but the number of signal lines increases
Solution Approach 1:
The essential detection signals are extracted directly from the detection switch units and fed to the first detection unit through dedicated signal lines, bypassing the need for full controller operation. This extraction approach isolates only the critical detection functionality needed for energy saving mode, minimizing the number of additional signal lines required
3Measurement precision
If multiple detection switches are used to detect paper size and open/closed state, then detection capability is improved, but the number of signal lines increases
Solution Approach 1:
Multiple detection switches are merged into a single detection switch unit that provides comprehensive detection information. The detection switch unit integrates signals from multiple switches and transmits them through a consolidated signal path to the first detection unit, reducing the number of individual signal lines while maintaining full detection capability for paper size and open/closed state
Data Source
AI summary
A sheet feed device includes a second detection unit which detects a state of a detection switch unit whose state is switched due to the change of state of the sheet feed device; a signal conversion unit which converts a detection signal obtained in accordance with a state of the detection switch unit into a serial signal; a communication line which connects a first detection unit of an image forming device to the second detection unit; and a signal line configured to connect the first detection unit to the signal conversion unit. When the sheet feed device is in a first state, the first detection unit receives information indicating the state detected by the second detection unit via the communication line, and thereby detects the change of state of the sheet feed device.