Sheet Feeding Apparatus Torque Control for Temperature Variations
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Solution Overview
Problem
Existing sheet feeding apparatuses in image forming devices, such as copiers, are prone to double feeding and non-feeding issues due to ambient temperature changes, which affect the separation and conveyance of sheets.
Innovation Solution
A feeding apparatus with a feeding roller and a separation roller, utilizing a torque limiter and a controller that adjusts the rotational force transmission based on temperature detected by a temperature sensor, employing different feeding operations to prevent double feeding and ensure stable sheet conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torque limiter is used to control the separation roller to prevent double feeding, then double feeding is prevented, but the system becomes sensitive to ambient temperature changes causing non-feeding issues
Solution Approach 1:
The patent applies dynamics by making the transmission mechanism adaptable to different temperature conditions. The transmission mechanism is configured to selectively transmit rotational force based on detected temperature, allowing the system to dynamically adjust its behavior to maintain reliable sheet separation across varying ambient temperatures
Solution Approach 2:
The patent changes the operational parameters of the transmission mechanism based on temperature detection. When temperature exceeds a predetermined threshold, the transmission mechanism switches between different operational states (transmitting vs. not transmitting rotational force), thereby adapting the system's mechanical parameters to compensate for temperature-induced variations in sheet properties
2Productivity
If the separation roller rotates strongly to separate sheets quickly, then sheet separation speed increases, but double feeding occurs due to insufficient control
Solution Approach 1:
The patent implements feedback control by detecting temperature conditions and using this information to control the transmission of rotational force to the separation roller. This feedback mechanism ensures that the separation roller receives appropriate rotational force based on real-time environmental conditions, maintaining both high separation speed and reliable double feeding prevention
Solution Approach 2:
The patent applies preliminary anti-action by proactively controlling the transmission mechanism to prevent double feeding before it occurs. By detecting temperature conditions in advance and adjusting rotational force transmission accordingly, the system preemptively counteracts conditions that would lead to double feeding, ensuring reliable sheet separation
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
The apparatus effectively prevents double feeding and non-feeding by dynamically adjusting the rotational force transmission to the separation roller based on ambient temperature, ensuring reliable sheet conveyance and high-speed feeding.
Implementation Method 1
a separation roller for conveying the sheet in a reverse direction against the sheet feeding direction based on rotational force transmitted trough a torque limiter
Data Source
AI summary
A feeding apparatus including a feeding roller for conveying a sheet, a separation roller for conveying the sheet in a reverse direction, a transmission mechanism for transmitting the rotational force to the feeding roller, a limited force reverse transmission mechanism for transmitting the rotational force to the separation roller through a torque limiter, a forced reverse transmission mechanism for directly transmitting the rotational force to the separation roller, a temperature detector and a controller, wherein the controller controls the separation roller to receive rotational force through the forced reverse transmission mechanism after the limited force reverse transmission mechanism transmits the rotational force to the separation roller, then allows the limited force reverse transmission mechanism to transmit the rotational force to the separation roller, or to rotate the feeding via the transmission mechanism and the limited force transmission mechanism to transmit the rotational force to the separation roller.