â‘¡ Paper delivery transmission is unstable
A. Reasons for the above example ⑤
B. The solid area of ​​the imprint is large, and the ink layer is thick, resulting in a large force required for the printed sheet to peel off the rubber cylinder. When the paper tail is still printing, the impression cylinder has handed the paper to the receiving row and gritted the teeth. It is impossible to fully synchronize with the movement of the roller teeth, especially when the paper collection teeth row leaves the sprocket for linear trajectory movement, the speed is significantly reduced, so that the printed sheet is not tightly wrapped around the impression cylinder, but the printing paper must be attached Attached to the rubber cylinder, the printing is completed, the wet blot is facing the delivery support, and it is easy to make the tail of the printed sheet dirty, ghosting, wrinkling, and curling because the impression roller does not bite the paper. Glue (printed sheet is wound on a rubber cylinder rotating at high speed under the action of ink adhesion, and it is estimated that the maximum adhesion on a 700mm wide sheet can reach 70kg), or the overprint is not accurate; and the reason for this failure It is difficult for users to rule out. The root cause is that the machine structure is not designed properly and the cylinders are not properly arranged (only in terms of the overprinting process);
â‘¢ Poor roller lining, improper printing pressure;
â‘£ The blanket is not tensioned or skewed;
exclude:
â‘ A. Repair the left and right fixed guide rails, repair the wear surface, especially the top and bottom dead ends of the guide rail are the most severely worn. The brush plating method is used for on-site operation and re-grinding, which is convenient and fast, saving labor and materials;
B. Replace the needle roller bearings, the specifications are 12X15X10, if they are not available, the rollers can be processed instead, and the outer circle is quenched HRc40-45;
C. Surveying and mapping sector gears, or replacement of spare parts;
D. If the Liao 8 taper pin is found soon after it breaks, and the shaft has not been worn, it is only necessary to remove the broken pin and re-insert it into the new pin positioning; if it is found, the shaft is worn, only need to be brushed Shafts and reaming holes can get twice the result with half the effort and avoid troublesome disassembly and installation. If the bearing fails, domestic 20 bearings can be used instead;
②A. Same as the above method ⑤
B. Thin the ink layer, reduce the viscosity, improve the printability of the paper, or consider it from the process and production arrangements. In short, all this is to try to reduce the peeling force of the printed sheet from the rubber cylinder;
C. The remedy is to improve the structural design of the printing press. Try to make the collecting teeth bite the paper, only a small part of the paper tail is still in printing, and the imprint must be completed before the straight line movement of the collecting teeth. A three-cylinder Equal-diameter offset presses meet this condition. Of course, large-scale improved design is only meaningful to printer manufacturers, not to mention the K series is an early product of Heidelberg, a transitional product when it is converted from letterpress to offset, the structure is limited, This is a last resort.
â‘¢According to the process requirements and specific conditions, appropriately adjust the printing pressure and roller lining;
â‘£ Loosen the blanket, flatten the liner, and evenly tighten it.
Fault 4: The take-up row is twisted or broken
the reason:
â‘ The spring on the paper support roller is invalid, the support rod is thrown and bent, or the paper delivery line is interrupted;
â‘¡ The chain is too loose, and the vibration of the paper-collecting tooth row is too large, colliding with other parts, or the chain is fatigued and broken;
â‘¢Break the fixed shaft pin of the paper collecting row connected to the chain;
exclude:
â‘ Replace the spring, straighten or replace the pick-up row, and can also be surveyed and processed;
â‘¡Adjust the center distance of the sprocket and tighten the chain so that the height of 30mm can be lifted on the guide rail. If the chain is seriously worn, it can be replaced;
â‘¢Replace the shaft pin, which can be surveyed and processed.
Note: This failure is the most common, you should always check the support bar spring, shaft pin and chain to find the problem early and prevent it from happening.
Trouble 5: The paper-receiving row of teeth is not equal on both sides
Cause: The delivery tray is not parallel to the roller
Remedy: Loosen the connecting screw between the paper delivery seat and the chain plate. The side with the large bite moves backward, and moves forward to make it parallel to the roller.
Then tighten the screw, the bite should be 4 ~ 6mm.
Fault 6: The air pump violently vibrates with periodicity
Reason: The end nut of the piston in the air pump is loose, and it will hit the cylinder head of the air pump after exiting.
Exclusion: Disassemble the air pump and tighten the nut.
Fault 7: Uneven delivery
the reason:
â‘ The side alignment paper works abnormally;
â‘¡ Improper adjustment of the position of the paper-opening cam;
â‘¢ The humidity is low, the static electricity of the paper is serious, or the paper is too thin;
exclude:
â‘ A. Adjust or replace the spring connected to the cam follower rod, so that the flat paper shaft can drive normally;
B. Check the contact between the roller of the swing lever and the roller on the side fence and adjust it properly;
â‘¡According to the printing speed, paper weight and other factors, adjust the cam position (receiving paper discharge cam) appropriately.
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