Sheet Feeding Device Transmission Control for Separation Timing
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Solution Overview
Problem
In sheet feeding devices, there is a delay from when the conveying member starts operating to when the separation member effectively separates a single sheet from multiple sheets, leading to potential issues with sheet conveyance before the separation function is fully exerted.
Innovation Solution
A configuration that includes a tray for stacking sheets, a feeding member, a conveying member, a separation member, and a transmission unit with a biasing member to control the movement of these components, ensuring the separation member abuts the conveying member only when the conveying member is driven, and the feeding member is stopped initially, then driven after the conveying member is operational, preventing sheet conveyance to the nip portion before the separation function is fully active.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the conveying member is driven immediately when feeding starts, then the sheet is conveyed quickly, but the separation member cannot effectively separate a single sheet from multiple sheets because it takes time for the separation member to exert its separation function
Solution Approach 1:
The separation member is positioned to abut the conveying member before the conveying member is driven, so that the separation function is established in advance. This preliminary positioning ensures that when the sheet is conveyed, the separation member is already in the correct position to prevent multiple sheets from being fed, thus resolving the contradiction between quick conveyance and reliable separation.
2Productivity
If the feeding member is driven continuously, then the sheet feeding process is efficient, but sheets are conveyed to the nip portion before the separation function is fully active, causing misfeeding
Solution Approach 1:
The feeding member is driven in advance to feed the sheet onto the conveying member before the conveying member starts moving. This preliminary feeding action ensures that the sheet is already in position on the conveying member when the separation member is fully engaged, preventing misfeeding while maintaining efficient continuous operation.
Solution Approach 2:
The system uses dynamic control where the feeding member and conveying member are driven at different times. The feeding member operates first to position the sheet, then the conveying member is driven to transport it. This dynamic sequencing ensures both efficient continuous operation and accurate separation by coordinating the timing of different components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures that sheets are not conveyed to the separation nip until the separation function is fully exerted, preventing misfeeding and ensuring accurate separation of individual sheets from multiple sheets.
Implementation Method 1
a biasing member configured to bias either of the first and second portions so that the first and second transmission surfaces move away from each other
Data Source
AI summary
A sheet feeding device includes a tray, a feeding member, a conveying member, a separation member, a transmission unit, and a biasing member. The separation member abuts the conveying member and separates a single sheet from sheets fed by the feeding member. The transmission unit includes first and second portions respectively having first and second transmission surfaces. Where the first and second transmission surfaces abut each other, the first portion drives the second portion that drives the feeding member. The biasing member biases either of the first and second portions so that the first and second transmission surfaces move away from each other. The conveying member is driven in a state where the separation member abuts the conveying member and the feeding member abuts the sheet stacked on the tray and is stopped. Thereafter, the first and second transmission surfaces abut each other, and the feeding member is driven.