Coating Roller Stopper for Nip Stability
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Solution Overview
Problem
Existing coating apparatuses experience coating unevenness due to the pressing roller jumping and the coating roller moving upward when a sheet enters the nip, leading to variations in the amount of coating liquid applied, especially with thick sheets or high conveyance speeds.
Innovation Solution
Incorporating a stopper as a restriction member that restricts the movement of the coating roller in the separation direction, maintaining a stable nip and consistent coating liquid application by abutting on the coating roller, and using a solenoid to control the stopper's position based on sheet thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pressing roller is used to apply coating liquid to the sheet, then coating can be performed, but the pressing roller jumps and the coating roller moves upward when a sheet enters the nip, causing coating unevenness
Solution Approach 1:
The stopper is positioned in advance to prevent the coating roller from moving upward when the sheet enters the nip. By having the stopper ready at the appropriate location, the system preemptively counteracts the upward movement tendency, maintaining nip stability and ensuring uniform coating application.
Solution Approach 2:
The stopper acts as an intermediary component between the coating roller and the sheet conveyance system. It mediates the interaction by providing a mechanical constraint that prevents excessive upward movement of the coating roller, thereby stabilizing the nip without directly interfering with the coating process.
2Productivity
If the pressing roller applies pressure to the coating roller, then coating liquid is transferred to the sheet, but the pressing roller jumps upward when a thick sheet or high-speed conveyed sheet enters, causing conveyance failures
Solution Approach 1:
The stopper is positioned in advance to prevent the coating roller from moving upward when the sheet enters the nip. By having the stopper ready at the appropriate location, the system preemptively counteracts the upward movement tendency, maintaining nip stability and ensuring uniform coating application.
Solution Approach 2:
The stopper is installed and positioned before the coating operation begins. It is pre-configured to restrict the upward movement of the coating roller, ensuring that the nip stability is maintained from the moment the sheet enters the coating zone, without requiring real-time adjustment during high-speed conveyance.
3Adaptability or versatility
If the coating roller is allowed to move freely to accommodate sheet thickness variations, then thick sheets can pass through, but coating unevenness occurs due to nip instability
Solution Approach 1:
The stopper provides a localized constraint at a specific position to prevent upward movement of the coating roller, while other parts of the system remain flexible to accommodate sheet thickness variations. This localized control maintains coating uniformity without compromising the overall adaptability of the coating apparatus.
Solution Approach 2:
The stopper restricts the movement range of the coating roller, effectively changing the mechanical parameters of the nip region. By controlling the vertical position of the coating roller, the system maintains consistent nip pressure and coating quality across different sheet thicknesses, while the pressing roller's elastic body compensates for thickness variations.
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 configuration reduces coating unevenness and prevents conveyance failures, ensuring a consistent coating liquid application without causing delays or sheet passage issues through the nip.
Implementation Method 1
A pressing roller is movable toward a coating roller by means of an elastic body, such as a spring
Implementation Method 2
using a solenoid to control the stopper's position based on sheet thickness
Data Source
AI summary
A coating apparatus includes a coating member, a pressing member, an abutment member, and a restriction member. The coating member coats a sheet with a coating agent. The pressing member is movable and abuts on the coating member to form a nip. The abutment member abuts on the coating member at a position different from a position of the nip. The restriction member restricts movement of the coating member in a separation direction in which the coating member separates from the abutment member.