Digital Printing Material Supply and Rewinding Mechanism
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Solution Overview
Problem
Existing digital printing systems face challenges in efficiently and accurately mounting long objects, particularly those made of thin materials like paper or film, due to increased friction and risk of tearing or wrinkling, which can lead to printing deviations and damage.
Innovation Solution
A device with a supply roll, first and second transfer rolls, and a rewinding roll with tension maintaining means, where the object is unwound and passed through the upper side of the transfer rolls to be fixed to the rewinding roll, ensuring constant tension and reduced operator effort, and optionally using auxiliary rolls to increase contact area with guides for stable transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the object to be printed is manually passed through multiple transfer rolls and auxiliary rolls, then the transfer stability is improved, but the operator's working efficiency deteriorates and the mounting process becomes cumbersome
Solution Approach 1:
The object to be printed is designed to be automatically guided through the transfer rolls by its own passage through the system. The guides and rollers work together to self-align and self-position the material without requiring manual intervention at each stage, allowing the operator to simply load the material and let the system handle the transfer process automatically
Solution Approach 2:
The manual operation of passing and positioning the object through multiple rollers is extracted from the process. Instead of requiring the operator to manually guide the material through each transfer point, the system uses automated guides and tension maintaining mechanisms to extract the manual positioning task, leaving only the initial loading and final collecting operations for the operator
2Ease of operation
If force is applied to the thin object to be printed during manual handling, then the object can be moved through the system, but the object may be torn or strained
Solution Approach 1:
Guides and tension maintaining means are introduced as intermediary elements between the operator's actions and the thin object. These intermediaries distribute the forces applied to move the object across multiple contact points rather than concentrating force at single points, preventing tearing and strain while still enabling successful transfer through the system
Solution Approach 2:
The tension maintaining means dynamically adjusts the force applied to the object during transfer. Rather than applying static or excessive force, the system dynamically modulates the tension to match the minimum required for movement, preventing damage to the thin material while maintaining continuous motion through the transfer rolls
3Productivity
If the object to be printed is not accurately mounted on the transfer rolls, then the mounting process is faster, but the straightness varies and printing quality deteriorates
Solution Approach 1:
Guides are positioned upstream of the transfer rolls to preliminarily align and position the object before it reaches the critical transfer point. This preliminary action ensures that the object is properly oriented and centered on the rolls before the actual transfer begins, eliminating the need for time-consuming manual adjustment while guaranteeing accurate positioning for high-quality printing
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
The solution simplifies the mounting process, reduces operator effort, ensures accurate alignment without width deviations, and improves printing quality by maintaining constant tension and preventing wrinkles during continuous printing.
Implementation Method 1
since a contact area of an object 10 to be printed with the first transfer roll 110 and second transfer roll 112 is increased, it is possible to stably transfer the object 10 to be printed with an increased frictional force
Implementation Method 2
a first tension maintaining means configured to apply a constant tension to the object to be printed which is mounted between the supply roll and the rewinding roll through the first and second transfer rolls
Data Source
Figure 1
Figure 2(a)~2(e)
Figure 3
AI summary
The present invention relates to a device for supplying and recovering printed material used in digital printing with which a long printed material can be simply mounted onto a digital printing apparatus so that the work efficiency of an operator can be improved. The present invention includes: a supply roll (204) around which the printed material is wound; a first transfer roll (210) which transports the printed material supplied from the supply roll to the lower part of a head part (202); a second transfer roll (212) which discharges the printed material on which printing is completed by the head part; and a rewinding roll (218) which has an axis of rotation parallel to the axis of rotation of the supply roll and which is rotated by a recovery driving means so that the printed material discharged from the second transfer roll is wound. The printed material is supplied when one end thereof is unwound from the supply roll and is fixed to the rewinding roll through the upper sides of the first transfer roll and the second transfer roll.