Splice Portion Tension Control in Printing Apparatus
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Solution Overview
Problem
Conventional printing apparatuses reduce productivity and printing quality due to damage risks at the splice portion of continuous printing media, where the joint between two rolls is weak and vulnerable to tension and heat, leading to reduced transporting speed and potential damage during the printing process.
Innovation Solution
A printing apparatus with a controller that detects the splice portion and reduces tension applied to it while it is in the drying or cooling sections without altering the transporting speed, and returns tension to normal after the splice portion passes these sections, ensuring efficient drying and cooling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the web paper is transported at reduced transporting speed to prevent damage to the splice portion, then the splice portion is protected from damage, but the productivity of prints is lowered
Solution Approach 1:
The patent applies different tension levels to different sections of the transport path. Specifically, the drying section operates with reduced tension when a splice portion is detected, while other sections maintain normal tension. This localized quality control protects the splice portion without requiring reduced speed throughout the entire system, thereby maintaining productivity.
Solution Approach 2:
The patent dynamically adjusts the tension in the drying section based on the presence of a splice portion. When a splice is detected by the detector, the controller automatically reduces tension in the drying section while maintaining normal operating speed. This dynamic adaptation allows the system to protect vulnerable splice portions without sacrificing overall printing productivity.
2Reliability
If the web paper is transported at reduced transporting speed to prevent damage to the splice portion, then the splice portion is protected from damage, but the printing quality is lowered due to dry conditions or differences in ink dispensing timing
Solution Approach 1:
The patent applies reduced tension specifically to the drying section when a splice portion is present, while maintaining normal transporting speed in the printing section. This localized intervention protects the splice portion from heat and tension damage without affecting the printing process, thereby maintaining printing quality through proper ink dispensing timing and drying conditions.
Solution Approach 2:
The system dynamically adjusts tension in the drying section based on splice detection, allowing the printing section to operate at constant speed and optimal conditions. This dynamic control separates the protection mechanism from the printing process, ensuring that printing quality is not compromised by speed reductions.
3Productivity
If the drying temperature is maintained at normal level while the splice portion is in the drying section, then the drying process is efficient, but the splice portion is damaged by heat
Solution Approach 1:
The patent applies different temperature conditions to different sections based on the presence of a splice portion. When a splice is detected in the drying section, the controller reduces the drying temperature specifically in that section while maintaining normal temperature in other sections. This localized temperature control protects the splice portion from heat damage while maintaining overall drying efficiency.
Solution Approach 2:
The drying temperature is dynamically adjusted based on the position of the splice portion. When the detector identifies a splice in the drying section, the controller automatically lowers the temperature in that section. This dynamic temperature control prevents heat damage to the splice while maintaining efficient drying conditions for the rest of the web paper.
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
Prevents damage to the splice portion without lowering productivity or quality, maintaining consistent transporting speed and ensuring effective drying and cooling processes.
Implementation Method 1
a drying section for drying at a drying temperature the printing media printed in the printing section
Implementation Method 2
a drying section for drying at a drying temperature the printing media printed in the printing section
Implementation Method 3
a cooling section disposed downstream of the drying section for cooling the printing media dried in the drying section
Data Source
AI summary
A printing apparatus for printing on printing media in a continuous business form. The apparatus includes a transport device, a detector for detecting a splice portion between the printing media transported by the transport device, a printing section for printing on the printing media transported by the transport device, a drying section for drying at a drying temperature the printing media printed in the printing section and transported by the transport device, and a controller for operating the transport device to reduce tension applied to the splice portion at least while the splice portion is located in the drying section.