The Cleaning Blade is a kind of Printer Accessories.
The cartridge is irradiated by laser beam to adsorb toner, and then the toner is hot pressed by fixing roller for printing. In this process, there will be part of toner residual, which can not be "granules returned to the warehouse"; Automatic cleaning function is not adsorbed new toner particles and directly print, will remain toner away, fully ensure the next printing effect. And the Plate-Grid plays an important role. When high voltage generator to a high voltage electrode, wire electrode with reseau formed between a strong electric field, and release the corona, wire electrode and the photosensitive drum ionizes the air between the air ions migrate to the drum surface, make the photoconductor (drum) surface is full of charge, so can spare toner "adsorption to warehouse", so as to save toner, The purpose of reducing environmental pollution.
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The most commonly used industrial robots are typically six-axis, but recently I came across a collaborative robotic arm with seven degrees of freedom and I couldn't help but wonder why. It wasn't until I stumbled upon an online discussion that finally clarified things: How many degrees of freedom does the human arm (from wrist to shoulder) have? The answer was surprising — it's seven, a true replication of the human arm's natural movement. Most people probably never think about this, let alone understand what those degrees of freedom actually mean. Even engineers might struggle to explain them clearly.
I was impressed by how one netizen, Yang Shuo, provided such a detailed and insightful explanation. His answer was not only professional but also philosophical, making me want to share it with others. He began by saying he's familiar with robotic manipulation, but initially didn’t fully grasp the answers given by others. He admitted they weren’t easy for non-experts to understand, so he decided to break it down in simple terms.
His explanation started with a straightforward answer: Just count them! The human arm has seven degrees of freedom. Someone asked if five or six were the same, and he explained that 5 refers to the rotation when turning a key, with power coming from the twisting motion of the arm’s two segments. Six, on the other hand, is the rotation when placing a mouse on a table, where the power comes from the wrist.
He then introduced a key concept: a six-degree-of-freedom robot cannot change its configuration without altering the position of the end effector in space. This is known as the "six-DOF constraint." To illustrate, he described a simple robotic arm with a base, two joints, and two links — like opening a compass. No matter how you move the joints, you can't switch between a lefty and righty configuration without changing the end position.
This is why industrial robots often look awkward when reorienting their tools. They have to move around to avoid collisions, even though the position of the tool remains the same. But humans don’t face this problem. When turning a key, our hands stay in place while rotating, thanks to our seven degrees of freedom. That extra degree allows us to adjust orientation without moving the position of our hand.
If we had only six degrees of freedom, turning a key would be much more complicated. We’d have to twist our entire arm just to rotate the hand. With seven, we can do it smoothly. So why seven? Because more degrees of freedom mean more flexibility, but also more complexity and potential for instability. In robotics, having too many degrees of freedom can lead to unpredictable movements and increased risk of damage.
So, seven seems to be the perfect balance — enough freedom for natural movement, but not so much that it becomes uncontrollable. Whether it's a biblical number or just a biological coincidence, it's fascinating to think that our arms are designed with exactly the right amount of mobility to perform daily tasks effortlessly. I’m grateful for that answer, and I truly believe it's one of the most insightful explanations I’ve ever come across.