Conveyor Roller Inertia Control for Sheet Positioning
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Solution Overview
Problem
Conveyor devices with one-way clutches experience positional errors due to roller inertia when the drive source is suddenly stopped, causing inaccuracies in sheet conveyance.
Innovation Solution
A conveyor device design with dual rotational powers and a controller that alternates between two sets of velocity information for the rollers, allowing for controlled deceleration and reducing the impact of inertia by adjusting the rotation speed and duration based on whether the sheet is nipped by the rollers or not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way clutch is disposed on the power transmitter for transmitting driving power from the drive source to the roller, then the roller can be rotated to convey the sheet in one direction, but the roller continues to rotate due to inertia when the drive source is suddenly stopped, causing positional error of the sheet
Solution Approach 1:
The controller executes preliminary deceleration control by reducing the rotational speed of the roller before the drive source is completely stopped. This preliminary action prevents the roller from continuing to rotate due to inertia, thereby eliminating positional error of the sheet while maintaining reliable conveyance control.
Solution Approach 2:
The system dynamically adjusts the rotational speed of the roller based on real-time feedback from the drive source state. When the drive source is about to stop, the controller actively reduces the roller's rotational speed to match the changing operational conditions, preventing inertial rotation and ensuring accurate sheet conveyance throughout the deceleration process.
2Productivity
If the roller is rotated at high speed to improve conveyance efficiency, then productivity increases, but the positional error due to roller inertia during sudden stops increases
Solution Approach 1:
The controller executes preliminary deceleration control by reducing the rotational speed of the roller before the drive source is completely stopped. This preliminary action prevents the roller from continuing to rotate due to inertia, thereby eliminating positional error of the sheet while maintaining reliable conveyance control.
Solution Approach 2:
The system uses feedback from the drive source state and roller rotational speed to dynamically adjust the conveyance parameters. The controller monitors the actual rotational speed and position, comparing them with target values, and makes real-time corrections to maintain both high productivity and precise sheet positioning throughout the conveyance process.
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 approach effectively minimizes positional errors by managing the rollers' rotation speeds and deceleration phases, ensuring accurate sheet conveyance and reducing the likelihood of rollers rotating due to inertia.
Implementation Method 1
the roller is rotated due to inertia by an amount related to the rotation of the one-way clutch by the specific amount. That is, the sheet is conveyed by the inertia of the roller
Data Source
AI summary
A conveyor device includes: a first conveyor having a first roller; a second conveyor having a second roller and disposed downstream of the first conveyor; and a storage storing first information and second information in which a velocity or a deceleration of the first and second rollers is less in the second information than in the first information. A controller executes: a first rotation processing in which, when a state in which a sheet is nipped by the first conveyor is kept during a next conveyance in intermittent conveyance, a first roller and a second roller are rotated according to the first information in the next conveyance; and a second rotation processing in which, when the state is not kept in the next conveyance, the first drive roller and the second drive roller are rotated according to the second information in the next conveyance.