Parallel Torque Limiter and Electromagnetic Brake for High-Speed Media Separation
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Solution Overview
Problem
Conventional medium feeding devices face challenges in reliably separating media at high conveying speeds due to the inertia of rotational load-changing components, leading to potential paper feed failures and double feeds when using media with varying friction characteristics and strengths.
Innovation Solution
A medium feeding device with a brake roller system that includes a torque limiter generating a fixed load and an electromagnetic brake capable of changing the load, connected in parallel to improve response and separation efficiency, allowing for prompt generation of rotational load even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electromagnetic brake is used to change rotational load, then rotational load can be adjusted for different media, but response time deteriorates due to large inertia
Solution Approach 1:
The rotational load changing mechanism is divided into two independent parts: a torque limiter that provides fixed load, and an electromagnetic brake that provides variable load. This segmentation allows each component to have optimized characteristics - the torque limiter with low inertia for fast response and the electromagnetic brake for adjustable load, while together they achieve both fast response and adaptability.
Solution Approach 2:
The torque limiter and electromagnetic brake are connected in parallel to the brake roller, merging their functions into a unified rotational load changing mechanism. The torque limiter handles the fixed load requirement while the electromagnetic brake handles the variable load requirement, combining their advantages to overcome the limitations of either component alone.
2Productivity
If medium conveying speed is increased, then productivity improves, but separation reliability deteriorates due to inertia effects
Solution Approach 1:
The rotational load changing mechanism is segmented into a torque limiter (fixed load) and an electromagnetic brake (variable load) connected in parallel. This segmentation enables the system to achieve both high conveying speed and reliable separation by combining the fast response of the torque limiter with the adjustable capability of the electromagnetic brake, allowing the brake roller to generate sufficient rotational load promptly even at high speeds.
3Adaptability or versatility
If a single electromagnetic brake is used, then rotational load can be changed, but the inertia of the brake roller system prevents prompt response at high speeds
Solution Approach 1:
The rotational load changing function is segmented between a torque limiter with low inertia for rapid response and an electromagnetic brake for adjustable load. The torque limiter immediately responds to speed changes while the electromagnetic brake provides the necessary load adjustment, eliminating the response delay caused by the inertia of a single large electromagnetic brake system.
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 enhances the device's ability to prevent double feeds and ensure reliable separation of media at increased conveying speeds by reducing the influence of inertia and allowing for continuous adjustment of rotational load, thereby improving operational performance and efficiency.
Implementation Method 1
an electromagnetic brake that can change the load
Implementation Method 2
an element with large inertia, such as an electromagnetic brake, is used as an element which can change the rotational load
Implementation Method 3
a torque limiter that generates only a fixed load
Data Source
AI summary
A medium feeding device 1 includes a feeding roller 3 which conveys a medium S1 in a conveying direction, a brake roller 4 that is arranged to press the feeding roller 3 with a predetermined pressure, and a separating power generating device 7 which is connected to the brake roller 4 and generates rotational load in a direction counter to the conveying direction with respect to the brake roller 4. The separating power generating device 7 includes a torque limiter 19 which generates an upper limit torque T1 which is a fixed load as a first load generating unit, and an electromagnetic brake 23 which can change the generated load as a second load generating unit. The torque limiter 19 and the electromagnetic brake 23 are connected in parallel to the brake roller 4.