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2022-08-07
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Standardized operation method for equipment to solve the problem of uneven paper receiving

the purpose of solving the problem is to ensure that such problems do not occur again. Analyze the relevant factors that cause problems, predict their specific changes according to the internal relationship between the relevant factors, and standardize the relevant factors in the best state to achieve no problems. This is the ultimate destination for us to solve the problem. In the following, the author takes the uneven paper receiving of modern sheet fed printing machine as an example to illustrate the method of equipment standardization operation

problem: the printing materials of the new generation of PU coated fabrics produced through the technology of insqin brand overall solution are not well received

purpose: to keep the printed matter in order

there are two prerequisites for the orderly storage of printed matter: the printed matter must arrive at the paper receiving system regularly; Each functional unit of the paper receiving system is in the best state

analyze the relevant factors affecting the tidiness of printed matter:

1 The factors related to printed matter are: paper, ink, water and pressure

2. Whether the printed matter can reach the paper receiving system is directly related to the printing speed, paper feeding system and paper conveying system

3. Whether the printed matter can reach the paper receiving system regularly is directly related to whether the paper feeding system, positioning system, paper conveying system, embossing system and water supply system are in the best control state

4. Whether each functional unit of the paper receiving system is in the best state is directly related to each functional unit of the paper receiving system

it can be seen that the relevant factors affecting the tidiness of the printed matter are: paper feeding system, positioning system, water and ink supply system, embossing system, paper conveying system, paper receiving system and printing speed

problems often arise from the abnormal changes of related factors and the changes of their combination relationship. Let's take a look at the results of different combinations and abnormal changes of various relevant factors affecting the tidiness of printed matter:

1 Printing speed

if the printing speed is too high, paper flying will occur; If the speed is too low, the printed matter is not in place in the paper receiving system. Both of these will result in uneven collection and placement of printed matter

2. The paper feeding system

the paper feeding system is unstable in the following two ways: too fast and too slow. If the paper feeding is too fast, the teeth of the printed matter will be torn in a large area; The paper feeding is too slow. When the electric tooth detection is not in place, the printed matter cannot reach the paper receiving system smoothly because the functional units of the paper conveying system cannot reach the paper. These two will inevitably lead to uneven paper receiving

3. Positioning system

the positioning system includes two parts: one is front gauge positioning, the other is side gauge positioning. The fore and aft adjustment of the front gauge position will change the amount of paper in the feeding system. The front gauge moves forward greatly, which leads to more teeth and paper; Less displacement and less paper. Too much paper is easy to tear the teeth of printed matter; Too little paper will easily cause the paper to fall off. It can be seen that the change of the front and rear position of the front gauge must be within its normal change range

the influence of the side gauge on the tidiness of the printed matter is mainly reflected in its time coordination with the wiggler, its own lifting height and the pressure of the pressure spring during the positioning process. If the lifting height of the side gauge is less than 45, the positioning time of the side gauge will be prolonged, the falling time will be advanced, and the time for the paper to reach the front gauge will be shortened. In this way, it is very easy for the paper to start the side gauge positioning when it is too late to reach the front gauge. Because the positioned paper does not reach the front gauge completely, the paper feeding system will be unable to reach the paper and the paper will fall out. When the pressure of the side gauge compression spring is large, the rebound force after positioning will also increase correspondingly, which will cause uneven paper feeding. Uneven paper feeding results in two kinds of results: one is paper dropping, and the other is the tearing of the teeth of the printed matter. When the side gauge has just been positioned, the gripper teeth of the wiggler should just be gripped

if there is no paper in the teeth at this time, the paper in the free state is easy to be misfed due to the action of the rebound force, resulting in paper dropping. On the contrary, there is tearing at the mouth of the printed matter. In addition, due to the wear of the roller ball, improper adjustment of the back mountain or insufficient tension of the tension spring, the swinging device causes unstable paper feeding, which will not only produce inaccurate rules before and after the printed matter, but also easily cause paper dropping

4. Embossing system and water supply system

the paper passes through the embossing system to make the printed paper electrostatic at the instant of embossing and separation. The greater the imprinting force, the greater the static electricity. If the printed matter is charged, the front and back printed matter will be mutually exclusive in the paper receiving system. At this time, the printed matter seems to be in high spirits, which inevitably leads to uneven collection and placement of the printed matter. The normal water supply of the water supply system can effectively solve the problem of printing electrification, so as to lay a solid foundation for the tidiness of paper receiving

5. Water supply system and ink supply system although the normal water supply of the water supply system can effectively solve the electrostatic problem of printed matter, the change of water supply is often affected by the change of ink supply. If ink is big, water is big; if ink is small, water is small. It can be seen that to effectively solve the problem of printing with static electricity, we must take the normal balance of ink and water as the premise

6. Paper conveying system

if the angle of the paper conveying system is too small, the paper cannot be reached, resulting in paper dropping; At the moment of paper handover between two adjacent functional units of the paper transfer system, tearing will occur if the horizontal spacing between tooth pads is too large or too small. If the front functional unit has put paper, then the functional unit does not load paper, the paper will drop. If the former is faster than the latter, the latter will tear. In addition, if there is no pressure between the gripper and the tooth pad of the same functional unit of the paper feeding system, the paper will inevitably fall off. If the pressure is too high, the paper will become rotten at the gripper

7. Paper receiving system

the front, back, left and right paper blocks of the paper receiving system should be consistent with the paper specification to ensure that the paper is received neatly. In addition, the rear suction wheel shall ensure the stability of the printed matter in the paper suction state. If the printed matter is not stable, the subsequent chain row touches the tip of the printed matter, resulting in paper disorder. The early opening of the tooth ball in the chain arrangement will cause the printing materials not in place; Paper flying occurs when the tooth is opened late

to sum up, abnormal changes in the paper feeding system and positioning system will change the amount of paper in the paper feeding system; Abnormal changes in the embossing system, water supply and ink supply system will make the printed matter repel each other due to electrification; The abnormal changes among the functional units of the paper conveying system are finally manifested in the change of the amount of paper in the teeth; The abnormal change of each functional unit of the paper receiving system is that the printed matter cannot be returned in order, resulting in uneven paper receiving

in actual printing, the common manifestations of uneven collection of printed matter are as follows: the paper falls off, there is a gap at the mouth of the printed matter, the printed matter repels each other, and the previous printed matter at the paper collection position is knocked out by the subsequent chain row

the specific causes of uneven collection and placement of printed matter are determined as follows:

1 Paper drop

the paper falls at the paper receiving position. Pull out the dropped paper and compare this print with the normal print. If the dental impression of this print is smaller than that of the normal print, it indicates that the paper drop phenomenon is caused by inadequate paper feeding. Lift the side gauge, and the paper cannot be dropped during trial printing, indicating that the paper drop is caused by improper adjustment of the side gauge; If the paper drops, it means that the paper feeding system is unstable. If the dental impression of the dropped paper is consistent with that of the normal printed matter, it indicates that the paper drop phenomenon is caused by unstable paper transmission or too little paper

2. There is a breach at the mouth of the printed matter

the pre retraction gauge, which reduces the amount of paper in the paper conveying system. At this time, the breach disappears, indicating that it is caused by too much paper in the paper conveying system. If the break still exists, make the tooth opening angle of each functional unit of the paper transfer system greater than 45 ℃ and keep its outermost end at the same horizontal line. At this time, the break disappears, indicating that the break is caused by too small tooth opening angle or too long tooth

if the break has not disappeared, then the gap between the tooth pads of the front and rear functional units of the paper transfer system at the moment of paper handover should be detected, and the gap should be kept at about 20 ~ 30 wires, which can completely overcome the breach of the tooth temperature port of the printed matter

3. Printed matter repels each other

printed matter repels each other. The paper floats and cannot be returned in time. At this time, check the water supply and the sound during paper stamping and separation is too small. Small water supply and high transfer pressure will increase the static electricity of printed matter, resulting in the above phenomenon

4. The front printed matter at the paper receiving position was knocked out by the subsequent chain row

which was caused by uneven paper suction of the air suction cover. At this time, check the gap between the suction wheel and its lower suction outlet, the suction air volume, and the wear of the outer ring of the suction hood

the repair method of treating headache and foot pain is a temporary repair method, which can not fundamentally solve the problem. Find a run-up to the home furnishing industry nbsp; Wood plastic materials play an important role. It is a scientific method to seek the best state and standardized operation of the relevant factors that cause the problem, so as to systematically solve the problem. The system solution to the uneven collection and placement of printed matter is as follows:

1 The paper feeding system

to ensure normal and stable paper feeding, the following points must be grasped: the paper must be leveled, especially at the presser foot. The front of the paper stack is 2 ~ 4mm lower than the front flush paper block. The paper separation suction nozzle shall be in place, and the paper shall be returned as soon as possible after placing. The left and right middle points of the back blowing shall be aligned with the left and right middle points of the paper separation suction nozzle. The paper delivery suction nozzle shall be able to fall to the bottom point in the air suction state and operate stably. The time coordination among the presser foot, paper separation suction nozzle, paper delivery suction nozzle and the first paper guide roller shall be in the standard state of pressing the "reset" key. The space position of presser foot, paper separation nozzle, paper delivery nozzle, back blowing, brush and paper pressing block shall be in standard state. The blowing and suction air volume shall be adjusted to the standard state. The pressure of the paper belt and guide wheel of the paper board shall be adjusted to the standard state

2. Positioning system

the positioning system includes front gauge, electric tooth and side gauge. Their standard status is as follows:

(1) front gauge. II. The front gauge shall be at the same horizontal line to ensure the correct positioning of the front gauge. Make all functional units of the paper transfer system hold the paper within the range of 2 ~ 4mm. At this time, fix the front gauge and do not move it randomly

(2) electric tooth. The front gauge falls down and the procedure paper is in place. At this time, the distance between the front end of the electric tooth and the front end of the paper is about 1mm

(3) side gauge

① side gauge time: the paper is just loaded by the gripper and the side gauge pressure ball is just lifted. At this moment, the paper should be under the common control of both

② the maximum lifting height of the side gauge shall be greater than 45

③ the side gauge roller shall not be worn too much. The inspection method is as follows: when the side gauge is in the paper pulling state, lift the side gauge by hand, put down a 7-wire paper, put down the side gauge, and pull out the paper by hand. If the paper is hung up by the rolling thorn, the roller can be used

④ the pressure of the side gauge compression spring shall be as small as possible on the premise that it can position the paper in place. The small advantages are: first, it avoids the accelerated wear of the pressure ball and the roller; second, it greatly reduces the rebound force of the paper after positioning, which is conducive to the stability of the paper. ⑤ The axial rotation of the roller shall be stable without vibration

3. The paper transfer system

the paper transfer system includes a swinger, a paper transfer roller and a chain row. Their standard states are as follows:

(1) wiggler

① when the swing cam is at the minimum surface, the tension spring should have a slight tension

② keep a gap of 20 wires between the roller ball and the cam, and adjust the backer on both sides on this premise

③ at the moment of connection between the wiggler and the front paper transfer roller, two functional unit tooth pad

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