Take-up Roll Change-over Guide Device and Clamping Mechanism
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Solution Overview
Problem
In roll-to-roll printing systems, the manual intervention required to change-over take-up rolls is time-consuming, leading to interruptions and potential damage to printed sheets, which negatively impacts productivity and print quality.
Innovation Solution
An apparatus with a guide device and clamping devices that automatically redirect and clamp the printed sheet, allowing continuous printing while the full take-up roll is replaced, featuring a cutting device to terminate the sheet length, and an attachment device to secure the trailing edge, all controlled by a unit that senses roll capacity and print job completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual intervention is used to change-over take-up rolls, then the operator can replace the full roll, but the change-over process takes several minutes causing printing interruptions and sheet damage
Solution Approach 1:
The system performs self-service by automatically detecting when the take-up roll is full and executing the change-over process without operator intervention. The printing system continues running while the full roll is automatically replaced, eliminating manual operations and their associated time losses.
Solution Approach 2:
The system prepares for change-over in advance by providing a buffer zone that accumulates printed sheets before the take-up roll is fully replaced. This preliminary buffering action allows the printing process to continue uninterrupted during the roll change-over.
2Ease of operation
If manual change-over is performed, then the full take-up roll can be replaced, but printed sheets accumulate in the buffer zone and become creased or damaged
Solution Approach 1:
A buffer zone acts as an intermediary between the printing system and the take-up roll. This buffer accumulates printed sheets temporarily, serving as a mediator that prevents direct contact and potential damage between the printing process and the roll replacement operation.
Solution Approach 2:
The printing process maintains continuous operation during the take-up roll change-over. By keeping the printing action continuous and uninterrupted, the system prevents sheets from becoming creased or damaged that would occur if printing were stopped and sheets accumulated under tension.
3Ease of operation
If the printing system is interrupted for take-up roll change-over, then the roll can be replaced, but productivity is significantly negatively impacted
Solution Approach 1:
The printing process continues uninterrupted during the take-up roll change-over operation. The system maintains continuous printing action while the buffer zone handles the roll replacement, eliminating any loss of time that would result from stopping the printing process.
Solution Approach 2:
The buffer zone is prepared in advance to accumulate sheets before the take-up roll is replaced. This preliminary preparation allows the printing system to continue operating without interruption, preventing time loss that would occur if printing had to be stopped for roll change-over.
Data Source
Figure 1~2
Figure 3
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AI summary
The present invention provides apparatus (1) for assisting change-over of take-up rolls (R) in a printing system (100), especially in a roll-to-roll printing system. The apparatus (1) comprises a guide device (2) for directing or guiding printed sheet (S) output from the printing system (100) along a transport path (P) towards a take-up roll (R) for winding or taking up a length of the printed sheet (S), and a first clamping device (5) for holding a new leading edge region (EL) of the printed sheet (S) formed after the printed sheet (S) is cut to terminate the length of the sheet (S) to be wound or taken up onto the take-up roll (R). The first clamping device (5) is configured to hold or clamp the new leading edge region (EL) of the printed sheet (S) against movement along the transport path (P) towards the take-up roll (R). The guide device (2) is movable to redirect the printed sheet (S) output from the printing system (100) to a buffer zone (B), and the guide device (2) is configured to redirect the printed sheet (S) to the buffer zone (B) when the first clamping device (5) holds or clamps the new leading edge region (EL) of the printed sheet (S). Furthermore, the invention provides a corresponding method of handling take-up rolls (R) in a printing system (1).