Introduction: Carlson conducted electrophotography experiments in the kitchen of his home and applied for a patent for the process technology in 1938. He created the first photocopying products using sheets of zinc masked with sulfur. He built the first "copying machine" using a zinc plate covered with sulfur. The words ?10-22-38 Astoria? were printed on a microscope slide that was placed on sulfur and exposed to strong light. After the slides were taken away, the mirror image of those words remained on the brimstone. Carlson planned to sell his invention to a number of companies, but the process was immature and failed to materialize. Issues that need to be paid attention to when operating a copier
A copier is a consumable equipment. As the working time of the machine increases, each component will experience a certain degree of wear, aging, and failure. Therefore, the operator is required to be able to operate the machine. Have a general understanding of its principles, performance and structure, especially learn how to troubleshoot some minor faults that often occur, otherwise you will not be able to do this job. The important point here is that when a certain failure occurs during the copying process, you must not act hastily and deal with it only after you find out the cause. The most common problem is paper jam. Some machines need to open the door (cut off the power supply) to eliminate the paper jam, press the reset button, and close the door before continuing to copy. Some large machines still need to warm up after eliminating the paper jam. One or two minutes.
Usually, as long as the machine has paper pickup action, but for some reason, the paper is not pulled out of the paper box and into the paper path. Due to the time detection of the timing controller, the paper is not in place or does not pass. Several detection sensors on the paper path are considered to be paper jams, and the machine will stop running if a jam signal occurs. At this time, it is also necessary to open the machine door (power off) and repeat the above actions.
If this phenomenon occurs repeatedly, users will inevitably become impatient. Many people even throw and beat themselves, close the door and other actions with heavy force, causing new malfunctions of the machine, such as door damage, door micro-shutdown, etc. Poor contact of the automatic switch, vibration and damage to other vulnerable parts, making the machine work unstable, etc. Therefore, when the machine is not working well, you should carefully check the cause of the failure, replace worn parts in time, or ask maintenance personnel to perform maintenance to ensure the normal operation of the machine. Content extension:
Copy work skills
Copying is a highly technical job. Being skilled in technology can not only improve work efficiency, but also save paper, reduce waste, and ensure the normal operation of the machine. operation. Here are some copying skills you should master.
1. Appropriate exposure
During the copying process, you will encounter originals with various shades of tones. Some originals are also mixed with writings of different shades, such as printed copies. When encountering this situation, you should use lighter writing as a condition and reduce the exposure to make it appear. The specific method is to increase the development concentration and adjust the concentration to the darker end; for photos , pictures and other subjects with low contrast and dark tones should reduce the development density and adjust the density to the lighter side. If the quality of the copy is still unsatisfactory, you can increase the exposure by pulling out the exposure slit plate (some are located on the charging electrode, and some are installed separately near the photosensitive drum), and make the light slit wider. Or increase the exposure voltage to make the image lighter)
2. Double-sided copying
Some high-end copiers only have the function of automatically copying both sides, while most machines require When copying two sides, you still need to reload the copy into the paper tray and print the second side. Double-sided copying technology has many uses, such as advertisements, tapes, instructions, business cards, forms, and documents with too many pages that need to be reduced in thickness. This not only saves half the paper, but also reduces the space occupied by the document and makes it easy to bind. Before overprinting both sides, air should be fully introduced between the copy papers to prevent double sheets. Print the odd-numbered pages first, then, depending on the type of machine you are using, load the copy into the paper tray and copy the even-numbered pages.
Some machines should turn the upper and lower ends of the first copy so that the text side faces down, put it into the paper box, and then copy the second side; others should leave it intact. Just load it into the paper tray. The former is a straight paper feeding model, while the latter is a curved paper feeding model with the paper inlet and paper outlet on the same side of the machine. Another thing to note is that for machines that use fiber optic lenses, the originals are placed upright and the copies are also upright, while for machines that use lenses, the originals are placed upright and the copies are reversed, that is, upside down. Especially when copying small double-sided copies (not copy paper size), machines using lenses are difficult to operate. It is best to position the original in the middle of the copy-level size when copying the first side.
Just put it in the middle when printing the second side. But there may be errors on both sides. Another method is to place the upper right end of the manuscript table when printing the first side of the original, and the upper left end when printing the second side. The upper end of the copy paper does not move, but the paper is placed with the writing facing down. When overprinting a multi-page double-sided document, a double-sided document may occur, causing the page number to be misaligned. You need to always check whether the page number on the second side is correct. If it is incorrect, stop the machine and look at the remaining copies in the paper box to be overprinted. Continue printing to the end and then reprint the wrong pages.
3. Application of occlusion method
Copying work often encounters situations where the original is stained, needs to copy part of the original, remove the shadow of the original, etc. It is necessary to use occlusion techniques to remove unnecessary trace. The easiest way is to cover these parts with a piece of white paper, then place it on the plate and copy, and then remove it. When copying thick originals such as books, a shadow will often be left on the copy, which can also be eliminated by blocking. The method is to place a piece of white paper under the page to be printed to eliminate the shadow on the edge of the book. If you want to remove the shadow between two pages, you can cover the unprinted page with a piece of white paper and make the edge of it reach the edge of the writing on the printed page, and it will work.
4. Production of reverse copies
In design and drawing work, sometimes it is necessary to draw exactly the same reverse image according to a certain pattern. If a copy machine is used to do it, , is more convenient. The method is: take a piece of copy paper and a piece of copy paper (transparent tissue paper) that is larger than the pattern, apply glue on the edge of the tissue paper, and bond it to the copy paper. After drying, you can copy. When copying, the copy paper needs to face up. After printing, tear it off, place the required reverse side of the pattern (i.e. the back side when copying) face down on the platen glass, and then copy, you can get the exact same reverse. towards the pattern. Copy paper can also be replaced by drawing sulfuric acid paper or transparent polyester film.
5. Production of teaching slides
Any text or chart can be copied on a transparent polyester film using a copier for teaching projection. The specific method is to place the original, adjust the development density, and use the manual paper feed tray to feed the polyester film. If the film gets stuck easily, you can put a piece of copy paper underneath it and stick it on the end that enters the machine first with transparent tape. The film that has been transferred and the image is normally stuck in the machine can be sent to the fuser entrance by opening the machine door, and then rotating the fuser roller paper discharge button to make it pass through the fuser and be fixed and discharged. If the toner image of poor transfer is scratched, the film can be removed and wiped clean with a damp cloth. It can still be used after drying. In addition, you can also use a copy machine to make business cards, search cards, etc. The operation method is similar to the above-mentioned double-sided copying and will not be described again. Under the premise of mastering the performance of the copier and not damaging the machine, text and images can also be copied on other materials (such as cloth).
6. How to deepen the density and avoid stains
For originals with images on both sides, you want the image to be clear when copying without revealing the image on the back. If the copy is dirty, the easiest way is to put a piece of black paper on the back of the original to be copied. When there is no black paper, you can open the platen cover of the copier and make a copy. What will be printed out will be uniform black paper, which can be used as a base. This method is often used when making various drawings because the lines on the drawings need to be dense and the blank areas must be clean.