Digital Printer Phase Detection for Abnormality Location
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Solution Overview
Problem
Conventional digital printing presses face challenges in quickly identifying the location of abnormalities during printing, such as sheet floating, due to inertia-induced rotation of the printing cylinder after motor stoppage, leading to prolonged troubleshooting times.
Innovation Solution
A digital printing press equipped with a phase detector, abnormality detector, display device, and control device that stops the driving mechanism upon detecting an abnormality and calculates the abnormality occurrence position based on the printing cylinder's phase data, allowing for rapid visualization of the issue on a display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the printing cylinder is stopped immediately upon abnormality detection, then the abnormality position can be precisely identified, but the inertial rotation causes the cylinder to continue rotating and the abnormality position becomes uncertain
Solution Approach 1:
The system performs preliminary recording of the phase angle at the moment of abnormality detection, before the printing cylinder stops rotating. This preliminary action preserves the positional information that would otherwise be lost due to inertial rotation, enabling accurate abnormality location identification after the cylinder comes to rest.
Solution Approach 2:
The system uses a phase angle detector to continuously monitor the printing cylinder's position and provides feedback to the control device. When an abnormality is detected, the recorded phase angle information is fed back to indicate the precise location of the abnormality on the printing cylinder, guiding operators to the correct position for troubleshooting.
2Manufacturing precision
If the inkjet head is positioned close to the sheet for high print quality, then print resolution improves, but the floating sheet may contact the inkjet head causing damage
Solution Approach 1:
The abnormality detection system operates in advance to detect sheet floating conditions before the sheet reaches the inkjet head. By detecting the abnormality early during the printing cycle, the system can alert operators or adjust positioning to prevent contact between the floating sheet and the inkjet head, thus protecting the expensive printing components.
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
Enables quick specification and identification of abnormality occurrence portions during printing, reducing troubleshooting time and preventing print errors and inkjet head damage.
Implementation Method 1
a phase detector configured to output detection data specifiable a phase of the printing cylinder
Implementation Method 2
an abnormality detector provided at a position facing the printing cylinder and configured to detect an abnormality of one of the printing cylinder and the sheet
Implementation Method 3
an inkjet head provided at a position facing the printing cylinder and configured to print the sheet
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A digital printing press includes a printing cylinder configured to transport a sheet, a driving device (41) configured to drive the printing cylinder, an encoder (44) configured to detect the phase of the printing cylinder, and first to fourth inkjet heads (23 - 26) configured to print the sheet. The digital printing press includes a floating detector (22) facing the printing cylinder and configured to detect an abnormality of the sheet, a display device (8), and a control device (28) configured to control an operation of the driving device (41). The control device (28) includes a function of stopping the driving device (41) when the floating detector (22) detects a floating portion. The control device (28) includes a function of obtaining information specifiable a position of an abnormality occurrence portion based on the phase of the printing cylinder when the floating detector (22) detects the floating portion and the phase of the printing cylinder when the driving device (41) stops after floating detection and displaying the information on the display device (8). It is possible to provide a digital printing press capable of quickly specifying an abnormality occurrence portion detected during printing.