Corrugated Paperboard Feeder Gap Control and Safety
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Solution Overview
Problem
Conventional corrugated paperboard sheet feeding apparatuses face issues with finger entrapment between sheet feeding rollers and the grate due to varying gap sizes, which also lead to deviations in sheet feeding accuracy caused by changes in negative pressure during the feeding process.
Innovation Solution
A corrugated paperboard sheet feeding apparatus with a human detecting device to stop the sheet feeding rollers and elevating member when a person is detected in the work area, maintaining a gap size of 10 mm or less between rollers and the grate to minimize pressure changes and prevent finger entrapment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gap between sheet feeding rollers and grate opening portions is made large to prevent finger entrapment, then safety is improved, but sheet feeding accuracy deteriorates due to negative pressure changes
Solution Approach 1:
The grate is designed to move dynamically between raised and lowered positions. When a person is detected near the sheet feeding section, the grate automatically raises to increase the gap distance for safety. When no person is present, the grate lowers to maintain small gap distance for accurate sheet feeding. This dynamic adjustment resolves the contradiction between safety and precision.
Solution Approach 2:
The gap distance between the sheet feeding rollers and grate opening portions is changed as a variable parameter based on operational conditions. The control device adjusts the grate position to change the gap distance from small (during normal operation) to large (when person is detected), thereby adapting the safety margin and feeding precision according to real-time conditions.
2Reliability
If the grate is lowered to improve sheet gripping force, then feeding reliability is improved, but the gap becomes smaller increasing finger entrapment risk
Solution Approach 1:
The grate position is dynamically adjusted based on whether a person is detected in the work area. During normal operation, the grate is lowered to maintain small gaps for reliable sheet feeding. When a person approaches, the grate raises automatically to increase gaps and prevent entrapment. This dynamic behavior allows the system to switch between reliability-optimized and safety-optimized states.
Solution Approach 2:
The human detecting device provides feedback about person presence to the control device, which then adjusts the grate position accordingly. This feedback loop enables the system to respond to external conditions (person presence) by modifying the grate position, thereby balancing safety and reliability based on real-time environmental information.
3Object-affected harmful factors
If a human detecting device and control system are added to prevent finger entrapment, then safety is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical safety interlocks and guards with a sensing-based control system. The human detecting device (sensor) and control device (controller) form an automated system that monitors person presence and adjusts grate position accordingly, eliminating the need for mechanical safety devices while achieving equivalent or superior safety performance.
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 solution ensures accurate sheet feeding by maintaining a consistent gripping force and preventing finger entrapment, thereby reducing deviations and ensuring safe operation.
Implementation Method 1
the housing is further provided with a suction device and configured to suck the lowermost corrugated paperboard sheet downwardly through gaps between corresponding ones of the sheet feeding rollers and the opening portions of the elevating member, by using suctioning of the suction device
Data Source
AI summary
A corrugated paperboard sheet feeding apparatus comprises: a plurality of sheet feeding rollers; a grate formed with a plurality of opening portions for receiving the sheet feeding rollers and configured to switch between contact and non-contact states of the corrugated paperboard sheet with respect to the sheet feeding rollers; and a suction box configured to suck the corrugated paperboard sheet downwardly by gaps between the sheet feeding rollers and the opening portions, wherein each of the gaps is formed to be 10 mm or less, and wherein the apparatus further comprises a mat switch for detecting an entry of a person into an area in a sheet feeding section, and a control device for stopping movement of the sheet feeding rollers and/or the grate when the mat switch is turned on.