Inversion Vacuum Transfer Module for Sheet Register Accuracy
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Solution Overview
Problem
Converting machines face disruptions and misalignments during the transition of sheets between top and bottom printing cylinders due to changes in conveyance and adherence, leading to undesirable register shifts and misalignments in downstream operations.
Innovation Solution
An inversion transfer module with inlet and outlet vacuum transfers that change the side of sheet adherence, using pivotably movable locking parts and deflector arrangements to ensure smooth transition between top and bottom printing units, maintaining precise control over sheet conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sheet is conveyed on the top side for top printing and then switched to bottom side for bottom printing, then double-sided printing capability is achieved, but register shifts and misalignments occur in downstream operations
Solution Approach 1:
An intermediate inversion transfer module is introduced between the top and bottom printing units. This module acts as a mediator that performs the sheet inversion function, separating the inversion action from the printing process itself. The module includes inversion rollers that gradually flip the sheet from top-side conveyance to bottom-side conveyance, maintaining control and preventing sudden disruptions that cause register shifts.
Solution Approach 2:
The inversion transfer module employs dynamic control mechanisms including variable speed rollers and adjustable vacuum suction compartments. The vacuum suction force can be varied during the inversion process to maintain sheet adherence and control the inversion speed, ensuring smooth transition without causing misalignments in downstream operations.
2Reliability
If vacuum suction is applied to maintain sheet adherence during inversion, then sheet control is improved, but complex vacuum control systems are required
Solution Approach 1:
The vacuum suction system is segmented into multiple independent vacuum suction compartments along the inversion transfer path. Each compartment can be controlled independently, allowing selective application of vacuum force at different stages of the inversion process. This segmentation simplifies the control logic compared to a fully integrated complex system, as each compartment handles a specific portion of the inversion task.
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 inversion transfer module enables a controlled and precise change in sheet conveyance direction, minimizing disruptions and ensuring accurate printing, cutting, and creasing operations in converting machines.
Implementation Method 1
an inlet inversion vacuum transfer and an outlet inversion vacuum transfer, each configured to contact and transport a different side of the sheet
Data Source
AI summary
The present invention relates to an inversion transfer module (60) for a converting machine having a printing module (16) comprising a first printing unit (17) arranged to print on a top side (S1) of the sheet (1), and a second printing unit (17′) arranged to print a bottom side (S2) of the sheet. The inversion transfer module is arranged between the first printing unit and the second printing unit and comprises a first inversion vacuum transfer (62) arranged to contact the first side of the sheet and a second inversion vacuum transfer (64) configured to contact the second side of the sheet, whereby the inversion transfer module is configured to change the side of adherence and transportation of the sheet.