Brake Roller Torque Control for Multi-Feed and Jam Prevention
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Solution Overview
Problem
In medium conveying apparatuses, the increased frictional force between media when multiple items are placed on a tray can lead to multi-feed issues, while increasing the brake roller's torque to prevent this often results in jamming, especially with thin materials.
Innovation Solution
A medium conveying apparatus with a torque limiter that adjusts its load based on the height of media on the tray, using a processor to change the torque limit value, and a pick arm mechanism to manage the frictional force effectively, preventing both multi-feed and jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum torque applied to the brake roller is increased to suppress multi-feed, then multi-feed is prevented, but medium jamming occurs when thin paper is conveyed
Solution Approach 1:
The patent applies dynamics by making the torque limit value changeable based on medium stack height. The torque limiter transitions from a fixed-value component to a dynamic system that automatically adjusts its torque limit according to the detected medium height, allowing optimal torque application for different loading conditions
Solution Approach 2:
The patent changes the torque parameter of the brake roller based on medium stack height detection. By detecting the height of the medium stack and corresponding this to frictional force characteristics, the system adjusts the torque limit value to match the actual loading conditions, preventing both multi-feed and jamming
2Device complexity
If the torque limiter uses a fixed limit value, then the structure is simple, but it cannot adapt to different medium stack heights and frictional forces
Solution Approach 1:
The patent implements feedback by detecting the medium stack height and using this information to automatically adjust the torque limit value. The height detection unit provides feedback to the control unit, which then modifies the torque limiter's operating parameters, creating a closed-loop control system that adapts to varying conditions
Solution Approach 2:
The patent makes the torque limiter universal by enabling it to handle multiple operating conditions with a single device. The torque limiter can adapt to different medium stack heights and frictional force conditions, replacing the need for multiple fixed-value torque limiters or complex mechanical adjustment mechanisms
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 solution effectively prevents multi-feed by increasing torque when multiple media are present and reduces jamming risks with thin materials by dynamically adjusting the torque limiter's limit value based on tray height, ensuring reliable and efficient media conveyance.
Implementation Method 1
a torque limiter to control a load applied to the brake roller
Implementation Method 2
when the number of media placed on a medium tray is large, the frictional force between the media increases
Data Source
AI summary
A medium conveying apparatus includes a medium tray, a feed roller to feed media placed on the medium tray in order from the lower side, a brake roller located to face the feed roller, a torque limiter to control a load applied to the brake roller, and a changing member to change a limit value of a torque of the torque limiter according to a height of the media placed on the medium tray.