The offset printing press is composed of a paper feeding part, a regulation part, a water delivery part, an inking part, a roller stamping part, and a delivery part. There are intermittent and continuous two types of paper feeders.
The principle of continuous paper feeding is: the loose paper blowing nozzle of automatic paper feeding looses the paper on the surface, and with the assistance of the paper brush, the paper suction nozzle sucks up a piece of paper above, and the paper blowing nozzle drops Insert the paper pile underneath the sucked paper, press the paper stack and blow the air to completely separate the sucked up paper from the paper stack. At the same time, the paper feed nozzle sucks up the blown paper and advances the paper feed shaft. Retaining the paper teeth, the overseas Chinese move the paper forward under the feed roller and drive it through the friction drive.
The composition, role and adjustment requirements of the paper-feeding components 1. Side-block cardboard. Fixed on the separator frame, one on the left and one on the left and right, to ensure that the direction of “going and coming†of the paper stack does not move, the adjustment requirement should have a gap of 1 mm between the stacks, and the control of the arrival of the paper on the side gauge is 5-8 mm. .
2, rear block cardboard. Fixed at the tip of the separator frame, one on the left and the other to ensure that the tip of the stack is neat, and the upper block can prevent double sheets and multiple sheets.
Adjustment requirements and the edge of the pile of paper left 1mm gap position, the pressure block can suppress the paper pile can be.
3, stack of paper baffles. The function of stacking paper baffle is the basis for the paper coming and going during paper loading, and it helps the paper to be tidy.
4, loose paper mouthpiece. Loosening paper blowing mouth at the tip of the pile of paper, generally one on each side, symmetrically arranged, rectangular and cylindrical shape.
Adjust the loose paper mouthpiece to keep it 5-10mm away from the stack of paper. The high paper is adjusted to a position where it can loosen the top surface of the stack with 0-15 sheets of paper.
5, pressure paper mouthpiece. It is an automatic rising indicator mechanism that controls the height of the paper basket. The requirement for adjustment is that the time of blowing should be the moment when it fully presses the paper basket.
The amount of air is adjusted to the paper being sucked. There is a slight wafting and it is enough to press about 15mm at the tip of the paper basket.
6, block paper brush. It is one or two left and right, with flat brush and oblique brush, but also a thin steel sheet with elasticity instead of a brush.
The role of block paper brush: It is to prevent double-sheet or multiple sheets from separating paper. The adjustment requirement is approximately 2-5mm above the stack, and approximately 5-10mm from the stack.
7, paper suction nozzle. On the offset printing press, in general, the paper suction nozzle teachers have one or two on the left and right.
The role of the paper suction nozzle: At work, the first paper that is blown loose is sucked up. The adjustment requirements should be 2-3mm away from the stack of paper, and the amount of air parallel to the surface of the stack of paper must be kept. Under normal circumstances, it is advisable to adjust the amount of paper to absorb.
8, feed nozzle. One left and one right, or two right and left installations. The role of paper feeding nozzle: It is a piece of paper that takes over the paper suction nozzle and is sent to the paper feed shaft. The adjustment requirement is to control the high and low positions to just absorb the paper.
The adjustment of the air volume can suck up a piece of paper.
9, front stop paper teeth. Its role is to keep paper baskets tidy during the feeding process.
The adjustment requirement is that when the print paper is fed to the feed shaft by the feed nozzle, it is immediately tilted forward, and the paper bite is immediately returned to its vertical position immediately above the top of the paper.
Points to note about daily operations:
1. The paper must be loaded flatly, loaded together, loosely and loosely, can not be folded, broken and tattered, and loaded on the paper stacker.
2, in the printing of semi-finished products, to prevent the flip, anti-loading, to prevent adhesion, different specifications of the paper should be strictly separated, to avoid numerous hearts, causing accidents.
3, the time to open and close the airway should be correct.
4, the height of the paper basket should be mastered, the position of the stacking table bite the mouth, under normal circumstances the paper feed should be about -10mm or less than the paper stopper.
5. Always check if the paper is being fed or not, and check the position of the front and side gauges.
6. When the feeder fails, it cannot be solved for a moment and cannot be corrected by printing. The best way to do this is to stop the offset press and do a careful inspection and adjust it before printing.
7, look at the feeder, require strong sense of responsibility when working.
8, to carefully regulate the feeder, to ensure the normal convergence between the various parts, the gas line should be open.
9, after the adjustment is smooth, do not tamper with as much as possible, or move the paper-feeding parts, strengthen the contact of the shift, find the problem to be sober, calm thinking, do not tamper with other parts.
Common paper-feeding problems 1. Double-sheet and multi-sheet 1. Loose-sheet blowing nozzles are located at different heights and positions. Two or more sheets caused by loose paper are not blown.
2, loose paper blowing mouth lack of air volume, blowing is not loose paper, on the contrary loose paper blowing mouth too much air volume will also cause double and more.
3, the paper is not flat upturned, squatting, so that loose paper blowing mouth does not work, not blowing into the paper, the paper is not loose.
4, block paper brush position is not appropriate.
5, pressure paper blowing mouth position is wrong.
6, the paper stack height control is too high.
7, the paper nozzle suction too much.
8. The paper suction nozzle is too close to the paper.
9, paper is not clear, there are electrostatic phenomenon. Especially when it's dry in winter.
10, paper cutting is not neat.
Second, the skew of the paper 1, the size of the two paper feeding nozzles are inconsistent.
2. The paper stack on the stacking table is different from the height on the outside.
3. The rubber gasket above the suction nozzle is damaged.
4. The roller pressure on the feed shaft is not uniform.
5, uneven pressure on the pressure roller on the transfer table.
6, the ink on the paper has adhesion phenomenon.
7. Inconsistent elasticity of the conveyor belt. The fastening wheel under the tape should keep sliding.
Third, the analysis of the reasons for the air Zhang fault 1, pressure paper mouth into the stacker paper tray too much paper.
2, too pile of paper on the paper mouth at the mouth, can not suck the position.
3, the suction nozzle is too small, there may be rubber hose damage and leakage, or air pump air volume adjustment is not appropriate, rubber hose is too long and other reasons.
4, the brush's position is not suitable, if the brush into the edge of the paper tray too much, it will cause the paper feed time and space.
5. The rubber band on the suction nozzle will break the air for a long time and reduce the air suction caused by the suction. (Wang Xincheng is from "Printing Weekly")
The principle of continuous paper feeding is: the loose paper blowing nozzle of automatic paper feeding looses the paper on the surface, and with the assistance of the paper brush, the paper suction nozzle sucks up a piece of paper above, and the paper blowing nozzle drops Insert the paper pile underneath the sucked paper, press the paper stack and blow the air to completely separate the sucked up paper from the paper stack. At the same time, the paper feed nozzle sucks up the blown paper and advances the paper feed shaft. Retaining the paper teeth, the overseas Chinese move the paper forward under the feed roller and drive it through the friction drive.
The composition, role and adjustment requirements of the paper-feeding components 1. Side-block cardboard. Fixed on the separator frame, one on the left and one on the left and right, to ensure that the direction of “going and coming†of the paper stack does not move, the adjustment requirement should have a gap of 1 mm between the stacks, and the control of the arrival of the paper on the side gauge is 5-8 mm. .
2, rear block cardboard. Fixed at the tip of the separator frame, one on the left and the other to ensure that the tip of the stack is neat, and the upper block can prevent double sheets and multiple sheets.
Adjustment requirements and the edge of the pile of paper left 1mm gap position, the pressure block can suppress the paper pile can be.
3, stack of paper baffles. The function of stacking paper baffle is the basis for the paper coming and going during paper loading, and it helps the paper to be tidy.
4, loose paper mouthpiece. Loosening paper blowing mouth at the tip of the pile of paper, generally one on each side, symmetrically arranged, rectangular and cylindrical shape.
Adjust the loose paper mouthpiece to keep it 5-10mm away from the stack of paper. The high paper is adjusted to a position where it can loosen the top surface of the stack with 0-15 sheets of paper.
5, pressure paper mouthpiece. It is an automatic rising indicator mechanism that controls the height of the paper basket. The requirement for adjustment is that the time of blowing should be the moment when it fully presses the paper basket.
The amount of air is adjusted to the paper being sucked. There is a slight wafting and it is enough to press about 15mm at the tip of the paper basket.
6, block paper brush. It is one or two left and right, with flat brush and oblique brush, but also a thin steel sheet with elasticity instead of a brush.
The role of block paper brush: It is to prevent double-sheet or multiple sheets from separating paper. The adjustment requirement is approximately 2-5mm above the stack, and approximately 5-10mm from the stack.
7, paper suction nozzle. On the offset printing press, in general, the paper suction nozzle teachers have one or two on the left and right.
The role of the paper suction nozzle: At work, the first paper that is blown loose is sucked up. The adjustment requirements should be 2-3mm away from the stack of paper, and the amount of air parallel to the surface of the stack of paper must be kept. Under normal circumstances, it is advisable to adjust the amount of paper to absorb.
8, feed nozzle. One left and one right, or two right and left installations. The role of paper feeding nozzle: It is a piece of paper that takes over the paper suction nozzle and is sent to the paper feed shaft. The adjustment requirement is to control the high and low positions to just absorb the paper.
The adjustment of the air volume can suck up a piece of paper.
9, front stop paper teeth. Its role is to keep paper baskets tidy during the feeding process.
The adjustment requirement is that when the print paper is fed to the feed shaft by the feed nozzle, it is immediately tilted forward, and the paper bite is immediately returned to its vertical position immediately above the top of the paper.
Points to note about daily operations:
1. The paper must be loaded flatly, loaded together, loosely and loosely, can not be folded, broken and tattered, and loaded on the paper stacker.
2, in the printing of semi-finished products, to prevent the flip, anti-loading, to prevent adhesion, different specifications of the paper should be strictly separated, to avoid numerous hearts, causing accidents.
3, the time to open and close the airway should be correct.
4, the height of the paper basket should be mastered, the position of the stacking table bite the mouth, under normal circumstances the paper feed should be about -10mm or less than the paper stopper.
5. Always check if the paper is being fed or not, and check the position of the front and side gauges.
6. When the feeder fails, it cannot be solved for a moment and cannot be corrected by printing. The best way to do this is to stop the offset press and do a careful inspection and adjust it before printing.
7, look at the feeder, require strong sense of responsibility when working.
8, to carefully regulate the feeder, to ensure the normal convergence between the various parts, the gas line should be open.
9, after the adjustment is smooth, do not tamper with as much as possible, or move the paper-feeding parts, strengthen the contact of the shift, find the problem to be sober, calm thinking, do not tamper with other parts.
Common paper-feeding problems 1. Double-sheet and multi-sheet 1. Loose-sheet blowing nozzles are located at different heights and positions. Two or more sheets caused by loose paper are not blown.
2, loose paper blowing mouth lack of air volume, blowing is not loose paper, on the contrary loose paper blowing mouth too much air volume will also cause double and more.
3, the paper is not flat upturned, squatting, so that loose paper blowing mouth does not work, not blowing into the paper, the paper is not loose.
4, block paper brush position is not appropriate.
5, pressure paper blowing mouth position is wrong.
6, the paper stack height control is too high.
7, the paper nozzle suction too much.
8. The paper suction nozzle is too close to the paper.
9, paper is not clear, there are electrostatic phenomenon. Especially when it's dry in winter.
10, paper cutting is not neat.
Second, the skew of the paper 1, the size of the two paper feeding nozzles are inconsistent.
2. The paper stack on the stacking table is different from the height on the outside.
3. The rubber gasket above the suction nozzle is damaged.
4. The roller pressure on the feed shaft is not uniform.
5, uneven pressure on the pressure roller on the transfer table.
6, the ink on the paper has adhesion phenomenon.
7. Inconsistent elasticity of the conveyor belt. The fastening wheel under the tape should keep sliding.
Third, the analysis of the reasons for the air Zhang fault 1, pressure paper mouth into the stacker paper tray too much paper.
2, too pile of paper on the paper mouth at the mouth, can not suck the position.
3, the suction nozzle is too small, there may be rubber hose damage and leakage, or air pump air volume adjustment is not appropriate, rubber hose is too long and other reasons.
4, the brush's position is not suitable, if the brush into the edge of the paper tray too much, it will cause the paper feed time and space.
5. The rubber band on the suction nozzle will break the air for a long time and reduce the air suction caused by the suction. (Wang Xincheng is from "Printing Weekly")