Analysis of the hardware structure of UV flatbed printers. After reading this, you will know how to choose UV flatbed printers.

Table Of Contents

In addition to the head, the next step for the UV flatbed printer is to look at the overall machine structure and selected hardware.

Machine structure:

The structure of the UV flatbed printer is also divided into several sections:

1. Design of three-axis structure of X-axis, Y-axis, and Z-axis.

2. Circuit layout arrangement.

3. Design of ink route (referred to as ink route system).

4. Overall structural design and weight of the fuselage.

5. Functional assistance.

1. Design of three-axis structure of X-axis, Y-axis, and Z-axis:

This is the most basic structure of the machine and the most critical. The normal X-axis is responsible for transverse movement (left and right), the Y-axis is responsible for longitudinal movement (front and back), and the Z-axis is responsible for lifting movement (up and down).

When moving the X-axis, you must check whether the length of the beam is sufficient. Once the length is not enough, you will not be able to print horizontally to the edge. The verification method is to move the X-axis head to the opposite direction of standby. If the bottom of the head completely crosses the effective printing platform, and there is still room, then it is considered normal. If there is still some distance that has not been crossed or has just been crossed, then there is a problem.

The X-axis also depends on whether the straight lines are parallel. There are two most convenient and intuitive methods. Let me teach you. First, look at the material of the beam. If it is a hardened aluminum or steel beam, it also needs to be gantry-milled. , and it is milled on both sides at 90 degrees, then there is no problem. The material that has been milled by the gantry is easy to identify. The surface of the material that has been milled by the gantry must be as smooth as a mirror. If iron beams or aluminum profiles are used, regardless of whether they are gantry milled, the accuracy will not meet the printing requirements at all. Many merchants deceive buyers in pursuit of huge profits or lower configurations.

There is another key part of the X-axis that needs to be paid attention to, which is the part that supports the crossbeam. Finished parts are generally used here. It depends on the thickness and level of the finish. Once the thickness is not enough, it will not be able to withstand the effects of the crossbeam during movement. The vibration causes the entire machine to become unbalanced. Insufficient leveling will cause the front of the car to be not on the same level as the platform, which will cause the front of the car to be crooked. No matter how you adjust it, you will not be able to print the entire page of material. Therefore, the X-axis is one of the keys to consider for the accuracy of the entire machine.

The Y-axis is also very critical. Every step in the movement process must be well connected. Whether the whole page can be printed in high definition depends on the structure of the Y-axis. The first thing to check is whether the position of the Y-axis assembly guide rail has been milled to ensure that For parallel accuracy, it depends on whether to use a belt or a screw. Belts are fine for small machines, but they are completely useless for machines with a layout exceeding the 6090 model. The larger the machine, the higher the requirements. Try to choose a screw configuration.

Whether the Y-axis is parallel and the steps are smooth, the verification method is also very simple. Ask the manufacturer to print a very small cross, and use a 500x magnifying glass to see if the horizontal and vertical inks are on the same line. It will work every time.

Although the Z-axis has nothing to do with the movement of printing, it must be carefully watched. If it cannot be lifted or lowered, there is nothing else that can be moved. The Z-axis mainly depends on the lifting height and what is used to drive it. The higher the lifting height, the better. Okay, if the Z-axis is raised too high, there will be an accuracy deviation. If it is a beam or a front lift, it is recommended that the lifting height is within 25cm. If it is a platform lifting, then it depends on whether it is driven by a screw. The thickness of the screw affects the platform. load bearing.

2. Circuit layout arrangement:

The layout of the circuit is generally the best way to separate 220V from the motherboard. From the 220V plug to the power box, it is converted into 24V and 42V. It is best for these three electrical appliances that circulate large voltages to be together. It is best to connect 24V and 42V to the motherboard and driver on the other side, not too close to the power box. It is easy to cause static electricity to burn the motherboard, and the current disrupts the drive pulses. In more serious cases, it will cause leakage and cause the entire circuit to be scrapped.

3. Design of ink route (referred to as ink route system):

There are currently two types of ink flow systems on the market, one is the siphon system and the other is the negative pressure system.

Siphon system: as shown below

As shown in the picture above, the siphon is relatively simple. As long as the ink cartridge is higher than the nozzle position, the ink will continue to be output. Currently, all Epson printers use the siphon method. The advantage of the siphon is that it is not affected by temperature. As long as the ink cartridge reaches the nozzle smoothly, there is basically no problem…

Negative pressure system: as shown below

The negative pressure system uses air compression and uses an air bottle to control the pressure of the secondary ink cartridge and continuously press ink on the nozzle. The compression value needs to be controlled through the panel. The negative pressure system is sensitive to temperature. Once the temperature fluctuates too much, the ink will drip or break. , so many manufacturers will set the negative pressure value and adjust it on the panel. Ricoh series nozzles have always used negative pressure.

4. Overall structural design and weight of the fuselage:

The overall quality of a uv printer depends on the structure of the main body. The best one is the gantry structure, which has a solid horizontal and vertical structure. Iron is not as good as steel, and steel is not as good as quenched, which means that iron frame is not as good as steel frame, and steel frame is not as good as quenched steel frame. As long as the steel frame of a good machine is basically quenched once or twice, the quenched steel frame will not shrink or deform even if it is used for ten years. A very clear sound can be heard when the quenched steel frame is tapped by hand.

Of course, the heavier the UV flatbed printer, the better. Some manufacturers will even fill the square steel with cement to maintain the weight of the machine. The heavier the machine, the less it will shake when printing, and the beam will be more stable when the front of the machine swings.

5. Functional assistance: ink shortage alarm, anti-collision, automatic lifting:

These are essential auxiliary functions. When the ink level is less than 1/3, the ink shortage alarm will be activated to remind you to add ink in time.

When your material is uneven or will bulge when exposed to high temperature from a UV lamp, the anti-collision will stop in an emergency, allowing you to avoid scratches on the nozzle caused by the uneven material.

Automatic lifting plays a key role in the printing process. When your printing head is moving at high speed, and the material suddenly bulges, the automatic lifting will respond by lowering at any time to avoid scratching the nozzle.

Use of complete machine hardware:

UV printer hardware is mainly reflected in accuracy and stability, which is related to whether it can maintain uniform accuracy for long-term use. If the hardware is not matched or the quality of the hardware is reduced, it will seriously cause the machine to be unable to move normally and the accuracy to drift. Hardware is mainly divided into several sections, 1. Sports hardware selection. 2. Electrical appliance selection. 3. The details of matching.

1. Motion hardware selection:

Guide rails: Japanese THK guide rail, Taiwan Hiwin, Korean WON, domestically produced. These four types of guide rails are currently used the most. The best is of course THK. THK guide rails are easy to identify. The slider balls run on the surface of the guide rail, while other guide rails run on both sides of the guide rail.

Screw/belt: Mostly used in the Y-axis direction. The screw is the best. The belt will easily wear over time and affect the accuracy of the Y-axis. The spacing of the screw is also very important. It is best to use an imported silent screw.

Platform: The marble platform is of course the best, but you can’t use it. The vacuum adsorption aluminum platform is currently the best.

Magnetic levitation: Magnetic levitation is mostly used for the X-axis. If possible, of course, magnetic levitation is used. It is generally used with high-precision industrial print heads (Ricoh G6 or Epson i3200). Maglev normally needs to be paired with metal grating strips. Overall, it will be about 10,000 more expensive than the belt configuration.

2. Electrical appliance selection:

Power box: preferably from Mingwei, nothing else.

Motor: The best is, of course, the servo, the third is the closed-loop stepper, and the third is not necessary. The servo is preferably from Panasonic or Inovance. If you don’t know how to read the motor icon, or if you don’t know whether there is an extra section behind the motor, the extra section is a closed-loop motor. If it is a whole without branching lines, it is an open-loop motor. The open-loop motor cannot be used for printing.

Turbofan/suction fan: The turbofan of a large machine needs to be more than 1500W, and the suction fan of a small machine needs to be more than 1A, at least four.

3. Details of matching:

Detail 1: The steps need to be washed at the installation guide rails of the beams. Don’t ask why, you will understand after a year.

Detail 2: The support plate for installing the X-axis motor must be very thick, preferably aluminum.

Detail 3: For negative pressure brands, you can add my service account and ask me. It’s not convenient to tell me here. (Phone number/WhatsApp/Wechat +18615000122145)

Detail 4: The ink stack structure must be smooth and the positioning must be precise.

Detail 5: Lift the machine and see if there is any bubbling sound.

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