Paper Conveyance Device Torque Control
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Solution Overview
Problem
Conventional image forming apparatuses experience increased load torque on rollers due to paper rubbing against conveyance guides, leading to higher motor output torque requirements.
Innovation Solution
A paper conveyance device with independently driven upstream and downstream rollers, equipped with paper conveyance guides to guide both surfaces of the paper, and a processor that measures and controls load torques to determine if paper is rubbing against the guides, adjusting conveyance accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper conveyance guides are arranged in parallel between upstream and downstream rollers to guide both surfaces of paper, then paper conveyance stability is improved, but load torque on rollers increases due to paper rubbing against the guides
Solution Approach 1:
The patent applies dynamics by making the downstream roller rotation speed adjustable and controllable. The rotation speed of the downstream roller is regulated based on detected load torque values, allowing the system to adaptively respond to varying paper types and rubbing conditions. This dynamic control enables the system to maintain stable paper conveyance while minimizing excessive load torque by optimizing the rotation speed according to real-time feedback.
2Productivity
If downstream rollers pull tough paper in during paper conveyance, then paper conveyance capability is improved, but friction force against paper conveyance guides increases strongly
Solution Approach 1:
The patent implements feedback by using a load torque detector to continuously monitor the load torque on the rollers during paper conveyance. The detected load torque value is fed back to the control mechanism, which then regulates the rotation speed of the downstream roller accordingly. This feedback loop enables the system to optimize paper conveyance capability while minimizing energy loss to friction by adjusting the rotation speed based on real-time load conditions.
3Productivity
If driving motors for downstream rollers increase output torque to pull tough paper, then paper conveyance capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the rotation speed parameter of the downstream roller based on detected load torque conditions. Instead of always operating at high output torque, the system changes the rotation speed parameter adaptively - increasing it when needed to convey tough paper and reducing it when load torque is high to minimize power consumption. This parameter optimization enables effective paper conveyance while avoiding excessive motor output torque and power consumption.
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
Minimizes the increase in load torques on the rollers, reducing the need for excessive motor output torque and preventing unnecessary strain on the driving motors.
Implementation Method 1
a load torque sensor that measures a load torque on the downstream roller
Data Source
AI summary
A paper conveyance device includes: an upstream roller and a downstream roller being arranged at an interval in a paper conveyance path; paper conveyance guides being arranged between the upstream and downstream roller in the paper conveyance path to guide both surfaces of paper along the paper conveyance path during paper conveyance; drivers that drive the upstream and downstream roller independently; and a processor that measures the load torques on the upstream and downstream roller, that judges whether or not the paper is rubbing against one of the paper conveyance guides with reference to the load torques on the upstream and downstream roller, the load torques being obtained by the processor, and that performs controlled paper conveyance with reference to the load torques on the upstream and downstream roller depending on the result of the judgment being obtained by the processor.