Inkjet Printer Maintenance Carriage Dynamics
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Solution Overview
Problem
Industrial inkjet printers with scanning printheads face challenges in maintenance due to the continuous belt transport system, which blocks access to maintenance elements, making it difficult to perform procedures like capping and cleaning without disrupting the printing process.
Innovation Solution
A mechanism where the printhead and maintenance assembly are mounted on carriages that can move independently to create space between the printhead and the transport belt, allowing for maintenance operations without halting the printing process, using a combination of reciprocal drives and a belt drive to position maintenance elements correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous belt transport system is used for sheet media, then printing productivity is improved, but maintenance access to the printhead is blocked
Solution Approach 1:
The maintenance assembly is made dynamically movable relative to the printhead through a carriage system with reciprocal drives. The assembly can transition between a parked position (allowing printing continuity) and an operative position (providing maintenance access), resolving the static contradiction between productivity and maintenance accessibility
Solution Approach 2:
The maintenance assembly is positioned in a different spatial dimension (below the transport path) rather than alongside it. By moving vertically into the space between the printhead and belt, the assembly gains access to the printhead without interfering with the horizontal belt transport, thus maintaining productivity while enabling maintenance
2Ease of repair
If maintenance elements are positioned to access the printhead, then maintenance operations can be performed, but the printing process must be halted
Solution Approach 1:
The maintenance assembly is pre-positioned in a parked location below the transport path before maintenance is needed. When maintenance is required, the assembly quickly reciprocates into the operative position, performs the maintenance operation, and returns to the parked position. This preliminary positioning and quick reciprocating action allows maintenance to be performed with minimal disruption to printing continuity
Solution Approach 2:
The reciprocal drive system enables the maintenance assembly to quickly transition between parked and operative positions, minimizing the time the printing process is halted. The system maintains continuity of useful action by rapidly alternating between printing and maintenance modes, ensuring that maintenance operations are completed efficiently without significant interruption to overall productivity
3Ease of repair
If a maintenance assembly is added to the printer, then printhead maintenance capability is improved, but device complexity increases
Solution Approach 1:
The maintenance assembly is merged with the existing carriage system of the inkjet printer. By utilizing the carriage's reciprocal movement capability and integrating the maintenance elements into this existing structure, the patent avoids adding a completely separate complex mechanism. The maintenance assembly shares structural and control resources with the printing system, thereby reducing overall device complexity while still providing comprehensive maintenance capability
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 efficient maintenance operations like capping and cleaning without interrupting the printing process, ensuring continuous operation and maintaining print quality by allowing access to the printhead while the printer is in use.
Implementation Method 1
a second reciprocal drive for driving the second carriage to effect a first phase movement of the second carriage between a third position in which the maintenance assembly is parked at a position allowing printing of transported sheet media by the printhead and a fourth position in which the maintenance assembly occupies the space
Implementation Method 2
the belt connected to a motion transfer device to convert a predetermined movement of the belt to movement of the second carriage in a direction transverse to the first direction
Implementation Method 3
thermal drop-on-demand inkjet printheads commercially available under the MEMJET registered trade mark. Such printheads use thermal energy to produce a vapor bubble in ink occupying a channel so as to expel an ink droplet from a nozzle
Implementation Method 4
Ink is drawn from the main channel into branch channels by capillary action to replace ink that is ejected in the course of printing
Implementation Method 5
For each ink colour or type, a separate ink supply circuit is used having an ink supply container and a peristaltic pump for pumping ink from the container to the printhead
Implementation Method 6
the resistors being individually energized by electrical heating pulses in response to an input print signal
Implementation Method 7
In piezoelectric drop-on-demand printers, a voltage is applied to change the shape of a piezoelectric material and so generate a pressure pulse in the ink and force a droplet from the nozzle
Data Source
AI summary
Inkjet printing apparatus has a printhead mounted on a printer carriage and a maintenance assembly mounted on a maintenance carriage. Media are transported to the printhead for printing. To prepare for maintenance operations, a printer drive unit drives the printhead carriage between a printing position and a printer parked position where it is spaced from the printhead. A maintenance drive unit drives the maintenance assembly between a maintenance assembly and a position next to the printhead where it occupies the space vacated by the printhead.