Curious about the printer toner drum issue.
Curious about the printer toner drum issue.
My Brother MFC-9130CW printer employs color-specific drums. Each of the four colors uses its own toner cartridge and drum tailored for that color.
I'm wondering why drums are designed this way—maybe a chemical coating is better matched to a particular hue?
Thanks, BH
In short, there are numerous hues in the world.
Every color is formed from a fundamental blend of these basic shades.
By the way, check this out: https://mycolorcopies.com/how-does-color-printing-work/
If you need more similar resources, let me know.
The laser printer uses only black ink, forming the printed image from a grid of minuscule black dots. The method involves several stages.
First, the drum's entire surface is given a static charge.
Next, it rotates while being illuminated by light—often LEDs in Brother models—instead of a traditional laser, to produce a white background. This removes the static, leaving precise spots for the black toner.
Then, the drum moves through a tightly spaced source of toner particles that carry an opposite charge, drawing them onto the drum and forming the desired pattern.
Afterward, the drum rotates again, making direct contact with the paper to deposit all the toner onto it.
A soft brush cleans any excess toner not transferred, returning the drum to its charging position.
For the paper, it goes through a very hot wire known as the fuser, where heat melts the adhesive layer on the toner, permanently bonding it to the surface. The paper then moves into the discharge chute.
This method allows printing in just one black colour at a time. Once the initial three steps are complete, recharging white areas isn't possible without altering the existing toner placement, which requires a different light pattern and a new colour of toner.
To achieve full colour printing, the same process is repeated for four distinct toner colours. Each colour uses its own dedicated drum system, producing only the required dots for that specific hue.
The printer features a horizontal transfer belt beneath the four drums. Toner from each drum is sent to this belt rather than directly to the paper, allowing all colour dot patterns to be gathered together. The belt is then pressed onto the paper to transfer the toners, followed by the paper passing through the fuser wire and exiting.
After each cycle, a cleaning brush removes any residual toner before the drum recharges, ensuring smooth operation.