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structure and working principle

The hot roller is madeAluminum alloyComposition, the surface is coated with a layer of special substances, it can not only resist high temperature, the most important thing is that it will not adhere to carbon powder and other dirt, whether solid or molten liquid, therefore, it can carry the load (such as paper,sulfuric acid paperetc.) on the toner baking melting. Its heat source is a special far-infrared lamp tube in the center of the heat roller. When the laser printer is turned on and preheated (about 2 minutes), the temperature of the surface of the heat roller reaches more than 100 degrees Celsius, and the temperature is usually fixed at this position. After that, when the front paper is fed into the fuser during work, the lamp tube of the heat roller is turned on to heat to melt toner, but it is not heated when no paper enters, therefore, it can be ensured that the predetermined temperature range is not exceeded.

Routine maintenance

The heat roller is also relatively easy to damage in normal work.Accessories, its damage is mainly the special coating on the surface, once worn, it will stick toner or dirt on it, thus making the words or pictures on the output sample lack lines, and will also stick a black block in other blank places, which may be barely used for general manuscripts, but not for sulfuric acid paper with higher requirements for printing. In this sense, the daily maintenance of the heat roller is mainly to protect the coating on the surface from damage. Therefore, we should pay attention to the following points when we work at ordinary times:

(1) Be careful not to usesharp weaponTo scrape the heat roller, especially when the paper is jammed, pay attention to carefully take out the jammed paper. This is mainly to take out the jammed paper when the machine itself is running, or to open the machine cover, and then turn the gear by hand to let the paper out. Try not to pull it out hard by hand, let alone poke it with screwdrivers, tweezers and other benefits, so as not to damage the coating. Especially for today's more commonly usedHP 6L Laser Printer, because it is not easy to take out when paper jams, some users use tweezers, pliers and the like to clamp and pry, and pierce the outer film, making the output sample unusable. Therefore, for HP 6L printer, such as paper jam, you should first open the box cover, take out the powder box, release the switch of the heat roller (pressure lever), and then pull out the paper evenly along the paper heat. If all the paper is caught in the fuser, disassemble the printer and remove the jammed paper.

(2) usually pay attention to the hot rollerClean. No matter what type of laser printer, because the heat roller paper, toner, etc. often pass by the heat roller, although it is not sticky ink, it is inevitable that there will be some dirt (such as excessToner,Paper powderWait) stick on it, clean it up in time, turn off the power when cleaning, let the machine cool down and carefully disassemble the cover plate, use absorbent cotton to dip some clean water to remove the dirt on it, be careful not to use some organic solvents to avoid damageCoating. In addition, special attention should be paid to cleaning the separation claw in contact with the hot roller, because the separation claw often sticks to dirt, and the separation claw is always in contact with the hot roller when the hot roller is working. If there is dirt, it will inevitably rub the hot roller. If it is rubbed many times, the coating will be damaged. Therefore, it should be cleaned once after a certain period of time.Separation claw.

Here by the way I introduce the original Canon LBP-SX and LX models of the heat roller a little improvement method. Since the thermal switch and thermistor of this Canon laser printer are originally placed in the middle of the heat roller, the position of each switch almost meets the heat roller. After a period of use, the metal on the thermal switch (outsideFilmIt is easy to damage) dirt will stick to the shell and become very hard by long-term alternating hot and cold, so that it will contact the hot roller for a long time.Friction, it is easy to wear off the coating on the surface of the heat roller, causing damage to the heat roller. Later, after analysis, I found that the thermal switch is not necessary to be too close to the heat roller, because its switch is determined by the thermistor, and the thermistor must ensure the distance from the heat roller to ensure the correct temperature sensing of the heat roller, but the thermal switch can leave the heat roller, and its distance has no effect on the temperature sensing of the heat roller. Therefore, I took down the fuser, opened the cover, compacted the spring copper sheet of the thermal switch, and pulled the distance between the switch and the heat roller so that it would not touch the heat roller. After improvement, I installed it and tried it. The effect was very good. It not only did not affect the original fixing effect, but also avoided the problem that the thermal switch would wear the heat roller. The thermistor was relatively soft and not easy to damage the heat roller, thus greatly extended the life of the heat roller.

(3) to use qualified paper. The paper used in laser printers has certain specifications, generally 70~100 grams of offset paper. At ordinary times, we should try our best to use suitable paper (usually 70 grams of double-sided offset paper is used). Never use too thick paper and unsuitable coated paper, because it is too thickPaperNot only is it not easyOutputIt will also force the separation claw to move irregularly on the heat roller for many times, and even make the top part of the separation claw stick to the heat roller and damage the coating. Therefore, if the customer has special requirements, to explain the reason, do not take such business, so as not to do more harm than good.

(4) a way to extend the life of the hot roller. Today's laser printers have installed thermal switches and thermistors on the edges that do not affect the output, avoiding the problem that the heat roller is worn by them. Therefore, the damage of the heat roller is mainly caused by the friction between the separation claw and it. In order to avoid long-term friction on a place, it can be considered to turn off the hot roller after using it for a period of time, because there is no special structure and parts on the hot roller itself, and the difference between the two ends is that there is a gap at one end for transmission. Therefore, as long as the same gap is ground with a file at the other end, the contact parts between the separation claw and the hot roller will be completely changed, so as to avoid friction in the same position from beginning to end.malady, I have improved in this way in use and extended the service life of the hot roller. Those interested may wish to give it a try. In addition, for A3 formatLaser Printer, the replaced hot roller may sometimes be applied to A4 format printers, because as long as the bad hot roller is sawn short, thenFileOn the corresponding gap, sometimes it is OK.