Printer Rest State Transport Control for Tachograph Paper Jam Prevention
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Solution Overview
Problem
Printers for tachographs in commercial vehicles often experience paper jams due to adhesive bonding of the printing medium with components like pressure rollers, caused by high humidity and temperature fluctuations during extended periods of inactivity.
Innovation Solution
A control unit activates the medium transport device to perform periodic rest state transport, moving the printing medium in and/or counter to the output direction without a print job, preventing adhesive bonding by overcoming adhesive forces and maintaining the medium in a tensioned state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the printing medium rests on a pressure roller during stoppages to maintain positioning, then the medium remains in place and ready for printing, but adhesive bonding occurs between the printing medium and the pressure roller under humidity and temperature fluctuations
Solution Approach 1:
The patent implements periodic rest-state transport at intervals of 10-40 hours during stoppages. This periodic movement prevents continuous contact between the printing medium and pressure roller, thereby preventing adhesive bonding while maintaining positioning readiness. The system alternates between stationary positioning and periodic transport to resolve the contradiction.
Solution Approach 2:
The system performs preliminary rest-state transport before actual printing operations after long stoppages. This preliminary action loosens any potential adhesive bonds before the printing medium needs to be fed through the printer, ensuring reliable operation without requiring forceful paper ejection that could damage components.
2Reliability
If the printing medium is transported continuously to prevent adhesive bonding, then adhesive connections are avoided, but power consumption increases during rest periods
Solution Approach 1:
Instead of continuous transport, the system uses periodic rest-state transport at intervals of 10-40 hours. This dramatically reduces power consumption during rest periods while still preventing adhesive bonding by periodically moving the medium enough to break any forming adhesive connections without requiring constant energy input.
Solution Approach 2:
The system applies partial action by transporting the medium only enough during rest-state transport to prevent adhesive bonding, rather than continuous full-speed operation. The conveyance distance of 0.5-30 mm is sufficient to break adhesive bonds but minimal enough to conserve energy during non-printing periods.
3Reliability
If the printing medium is conveyed a long distance during rest state transport, then adhesive bonding is effectively prevented, but the additional power requirement increases
Solution Approach 1:
The system determines the optimal conveyance distance range of 0.5-30 mm during rest-state transport. This distance is sufficient to prevent adhesive bonding by moving the medium past the pressure roller contact zone, but not excessive enough to require high power input. The control unit adjusts the conveyance within this range based on operational needs.
Solution Approach 2:
The system changes the transport parameters (conveyance distance and frequency) dynamically. During rest-state transport, the medium is moved 0.5-30 mm at reduced speed and lower force compared to active printing operations. This parameter adjustment prevents adhesive bonding while minimizing power consumption during non-printing periods.
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
This solution effectively prevents paper jams by regularly loosening adhesions and allowing the printer to restart without issues, even after long stoppages, while minimizing power consumption.
Implementation Method 1
The printing medium regularly rests on a pressure roller, which leads the printing medium to the print head... The undesired adhesive bonding of the printing medium with components on which said printing medium rests, for example with a pressure roller
Data Source
AI summary
A printer and a method of controlling a printer in order to print out a report relating to data recorded by a tachograph are disclosed, the printer having a supply of printing medium and being equipped with a medium transport device. In the disclosed printer, rest state transport of the printing medium is carried out at periodically repeating intervals.