Common electrical faults of copying machine with t

2022-07-28
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Common electrical trouble shooting of copying machine with rubber pad roller shutter structure

copying machine is a kind of equipment that reproduces images on positive or negative negative film by exposure after they are closely contacted with photographic material film by means of vacuum adsorption

the photographic plate obtained by the plate making camera or the electronic color separation machine becomes a negative film with the original image after manual development and development by the developer; In addition, there are two forms of sulfuric acid paper and film produced by computer systems such as founder and apple. One is the continuous tone negative and positive image, and the other is the half tone positive and negative image with dots. According to the different requirements of the printing process, it is often necessary to use a copying machine to complete. For example, the continuously adjusted positive image (negative image) is reversely copied into a negative image (positive image), and the continuously adjusted negative image can be contacted and copied into a eye positive image, and 1:1 color separations and offset printing multiple image splicing copies can be made. Generally speaking, the purpose of copying is to realize the reversal of the negative and positive images on the one hand, and to make appropriate corrections to the shape and size of the tone levels or points of the original negative film. With the help of the brightness and exposure time of the copying machine, the halftone points and continuous tones on the negative and positive film are processed to make their fine levels meet the ideal requirements of printing and plate making, At the same time, it can also turn several small patterns into large format negatives

the product quality of a copying machine depends on two factors: first, whether the vacuum system of the copying machine can make the negative film and the photosensitive material film close together without any gap; Second, whether the illumination of the middle and surrounding edges of the entire layout is uniform during exposure

the copying machine with rubber pad rolling shutter structure used by our factory is produced by Shanghai printing equipment manufacturing factory. The model brings confidence to the extruder enterprise with the kb1000 split copying machine. 10. Open the oil return valve. This copying machine adopts the rubber pad rolling shutter structure, so it is not necessary to open the frame. It is convenient to operate. The original copy and the required exposure film are ground with a rubber roller rolling device, Then, the real

air suction sealing is carried out to achieve close contact, so the film will not be misplaced, ensuring the quality of copy images and texts. In the actual work of the machine, it often happens that the relevant electrical appliances, transmission system, contact limit and other parts of the rubber pad roller shutter structure device are prone to failure

the automatic operation steps of the copying machine with rubber pad rolling shutter structure are as follows: put the positive and negative image films to be copied on the glass plate of the copying machine, press the blanket covering and automatic operation button, at this time, the blanket covering motor drives the relay to pull in, and the blanket covering drive motor (synchronous low-speed motor model 110 TDY) starts to work to transmit power, Drive the rubber pad roll type structure device and the film pressing and rolling device. After the blanket is covered and spread, the contact eye position on the copying machine moves with the blanket pad roll curtain structure device. At this time, the contact limit will hit the contact of the blanket retracting limit switch. The electric circuit will be connected to the vacuum extraction pump. The use steps of the timing metallographic microscope and the calibration steps of the equipment will be introduced, After the negative film and film are closed, the exposure time relay works. Count to zero by subtracting the set number. The exposure time ends. Start the rubber receiving button, the vacuum pump stops working, the rubber returns to its original position, and the copy ends

during the copying process of this copying machine, the working procedures of covering and receiving blanket are frequently carried out. The covering and receiving blanket are driven by a low-speed synchronous drive motor, and a contact limit device is fixed on the chain in the way of chain mechanical transmission of power to control the distance between the covering and receiving blanket travel area. Limit switches for covering blanket and receiving blanket are installed at both ends of the copying machine, The most vulnerable part of the copying machine that has been used for several years is in the working procedure area of covering and collecting the rubber blanket. The copying machine has been used for a long time, and there are always bad times. The copying machine uses a low-speed synchronous drive motor. However, the power transmission is the way of chain transmission. The chain transmission is a medium and long-distance transmission, which can only transmit about 85% of the energy, which is consumed in the process of energy transmission, (in the power transmission, the transmission power energy consumption of gears and worm gears is the lowest) the chain is easy to be elongated and deformed after long use. Due to the disadvantages of chain transmission, the contact limit device installed on the chain cannot hit the contact of the limit switch covering and retracting the rubber blanket. If the chain transmission is faulty when the rubber blanket is rolled, the limit device on the chain cannot hit the contact of the limit switch covering and retracting the rubber blanket, At this time, the copying machine will not automatically vacuumize and inhale, and the following working procedures will stop

in our work, we should always adjust the tightness of the chain and try to tighten it as much as possible. Whether the high and low positions of the contacts (the same shape as the contacts of the travel switch) of the other two limit switches that wholeheartedly cover and retract the blanket roller shutter are appropriate. Due to the long-term use of the copying machine, the contacts of the limit switches that cover and retract the blanket roller shutter will collapse due to frequent impact of the contact limit, If the limit switch contacts at both ends are on the low side and can not contact the limit, the copying machine will not work normally. There are often failures such as non-stop, non suction and vacuum pumping, and equipment damage. In our work, we frequently observe the contact of the limit switch covering and retracting the rubber blanket roller shutter, move it up a little, and raise the contact position. There is a telescopic spring moving up and down under the contact of the limit switch, which can be adjusted. At the same time, it is also necessary to regularly check whether the parts fixing the contact limit on the chain are deformed by impact, and whether the two screws fastening the contact limit are loose. If they are loose, they must be tightened. Add grease to the chain regularly to keep the chain lubricated

in a word, the most vulnerable parts of the film copying machine with the rubber pad roller shutter rolling structure are: ① whether the limit switch contacts of the rubber pad roller shutter are collapsed; ② Whether the contact limit on the chain is fastened and deformed by impact; ③ Is the chain loose? There is something wrong with the power transmission. In case of any fault in this aspect during the work, it is necessary to comprehensively analyze it, find out the cause of the mechanical fault, and apply the right medicine to the case before it can be solved

like other equipment, the copying machine must be properly maintained in daily work to be in good working condition for a long time. The oil and gas system shall be checked frequently. The vacuum pump shall be checked once a month, and vacuum oil shall be added regularly. The oil level shall always be aligned with the oil level line; Replace the new oil once a year, pull off the suction rubber pipe frequently, remove the dust with iron wire, and keep the suction rubber pipe

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