Fabric Printing Tensile Force Control via Dual Roll Segmentation
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Solution Overview
Problem
Existing printing devices for fabrics face challenges in maintaining precise printing due to the elastic nature of fabric materials, which can lead to deviations in printing position caused by inconsistent tensile forces, resulting in blurred or inaccurately printed letters.
Innovation Solution
A printing method and device that incorporates a feed roll and a supply/feed roll to control the tensile force of the fabric material, using motors to rotate these rolls in a coordinated manner to maintain a consistent feeding length and prevent tensile force changes, ensuring precise positioning during printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single winding roll is used to feed fabric intermittently, then the device complexity is reduced, but the manufacturing precision deteriorates due to elastic fabric causing inconsistent tensile force and printing position deviation
Solution Approach 1:
The fabric feeding system is segmented into two independent rolls: the first winding roll (S1) that supplies fabric and the second winding roll (S2) that controls feeding to the print unit. This segmentation allows independent control of tensile force application and fabric delivery, resolving the contradiction by maintaining simple structure while achieving precise positioning through coordinated rotation of the two rolls
Solution Approach 2:
The system changes the operational parameters by controlling the rotation speeds and directions of two winding rolls independently. By adjusting these parameters, the tensile force on the elastic fabric can be maintained at a constant level while ensuring accurate feeding length, thus achieving high printing position accuracy without excessive device complexity
2Productivity
If the winding roll rotates intermittently to feed fabric, then the productivity is improved through continuous printing operation, but the manufacturing precision deteriorates due to elastic fabric causing length inconsistency
Solution Approach 1:
The control unit monitors the rotation states of both winding rolls and adjusts their operation to maintain constant tensile force on the fabric. This feedback mechanism ensures that even during intermittent rotation for continuous printing, the elastic fabric receives consistent tensile force, maintaining feeding length consistency and printing precision while preserving productivity
3Ease of operation
If fabric is fed through a flat plate platen, then the ease of operation is improved through simple support, but the manufacturing precision deteriorates due to fabric damage and printing blur
Solution Approach 1:
The invention extracts and removes the flat plate platen from the system entirely. Instead of supporting fabric on a platen that causes damage and blur, the system uses tensioned fabric between two winding rolls, eliminating the harmful contact surface while maintaining simple operation through automated roll control
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
A printing method is performed by use of a printing device. The printing device includes a print head 8a, a supply roll 1, a serving roll 3, a support roll 4, a feed roll 5, and a winding roll 7. The printing device is structured to feed a fabric material CL toward the winding roll 7 by a prescribed length each time when a cycle of print operation is performed by the print head 8a, so that the printing is performed on the fabric material CL intermittently. The printing method includes performing a first feed operation of intermittently rotating the feed roll 5 by a first motor M3 to pull the fabric material CL from a print unit 8 and feed the fabric material CL toward the winding roll 7 by a prescribed length; and performing a second feed operation of intermittingly rotating the serving roll 3 by a second motor M2 to feed the fabric material CL toward the print unit 8. A detected tensile force value based on a detected value of toward the tensile force of the fabric material CL detected at a position upstream with respect to the print unit 8 is compared against a preset target tensile force, and the second motor M1 is controlled based on a result of the comparison.