Other mechanical equipment like printing machine, in daily use will inevitably have some problems, some problems are very simple and we can solve it yourself, follow small make up a printing machine maintenance technician to it. The common faults of printing machine mainly has four aspects: the break fault, Sheung Shui, ink and imprint troubleshooting, fault folding part, overprint fault analysis and elimination.

1 broken paper

Broken paper is a very difficult thing to do, the main reasons for the following reasons:

(1) edge crack, tight side, side edge bumps or sticky glue. A roll tight side or side glue stick tape is easily broken, affect the normal supply of paper. Found that this phenomenon can be used to wet the wet brush or stick to the side of the glue, the fault will be excluded.

(2) the core barrel roll itself is not round. The operator can judge whether the eccentricity of the cylinder core is too large, and it can be avoided by changing the paper or by changing the paper or the machine.

(3) the lifting speed is too fast or too large. Paper has the tension limit, increase the tension should be as far as possible to stay away from the ultimate tension. At high speed, a very small change will produce a very large stress, which leads to a broken paper.

(4) the guide roller core shaft is loosened, the horizontal degree and the degree of peace are not allowed, the core shaft or bearing wear. For the use of a certain number of years of the machine, should cause enough attention, maintenance personnel and operating personnel should be timely check the work of the paper roll.

(5) ink on the paper roll on the ink. Long time after startup, the increase of each scale deposition of ink roller radius, so that the tension increases. When the tension reaches the limit value, the machine will cut off the paper. Therefore, the ink on the paper roll should be cleared in time.

2 Sheung Shui, ink and nano imprint lithography

(1) water supply section

Water supply device can be divided into two kinds of indirect water supply and direct water supply. Either way, the purpose of which is to make the printing plate full of moisture, and maintain the balance of ink. Various fault specific manifestations are: water partial assembly makes the ink dull, pale gray light, the ink is not full, which would cause the ink emulsification; water is too small, will make the printing plate can not be fully wet, produce graphic deformation, indistinct. According to the structure and function of the water supply mechanism, the method can be adjusted according to the structure of the water supply mechanism.

Such as by checking the bucket motor or solenoid valve flapper nozzle work, water roller, water roll, roll and on the version of the drum pressure is normal to troubleshooting, should pay attention to water roll pressure must be transferred to the balance position. Usually should be cleaned water roller and bucket nozzle, check the water pressure between the rolls.

(2) the supply of ink

The ink supply mechanism is composed of an ink fountain roller, ink roller, ink composition, on version of roller. Its common faults are: the shortage of ink for ink quantity is too large, the ink is not stable, etc.. Between the above fault by checking the ink fountain roller and nail and the roller pressure is normal to exclude. Adjust the rollers, should be adjusted to test each roller about whether the balance is consistent, and must ensure that the pressure roller by moderate version, ink roller and roller receiving ink with a good, keep printing ink evenly, the maximum to avoid before and after the printing ink of the deep and inconsistent phenomenon appeared, and carefully check on version of roller surface is smooth, there is no major mishap such as indentation, scratch or usual ink glue caused by local regulation is not good, the crystallization phenomenon of conjunctiva. Due to the difference between winter and summer temperature, adjust the winter can be appropriate to increase the pressure, the summer can be appropriate to reduce the pressure.

(3) stamping parts

The imprint is the core part of the printing unit, is the design and manufacture of the most precise parts, manufacturers generally do not allow the user to adjust the pressure parts. Printing pressure is an important factor in the process of printing ink transfer is completed, the printing pressure is moderate by the printing of the printing layout, text, pattern clear text, no deformation, reliable ink uniform. The fault phenomenon is mainly weak, ink is not clear, text dot deformation, the reason is that the ink transfer is not sufficient, is due to loss of elasticity or blanket lining is too small to cause, as long as the replacement of the new blanket or add bag lining thickness can be ruled out.

The 3 part of the fault set out

There are many factors that affect the color printing, paper, printing process, printing process, equipment and other aspects of the printing process are likely to have an impact on the set of. Here are mainly from the mechanical point of view, analysis of some common set of quasi failure.

(1) factors affecting the stability of paper tension

The main factors that affect the stability of paper tension are: paper frame, three roll (infeed), variable speed (PIV), etc.. The tension adjusting mechanism of tension adjustment is not appropriate, or various types of rollers parallel, horizontal deviation is larger, or rack brake wear, roller bearing wear and other reasons will lead to tension and instability, caused by misregister.

(2) factors affecting the accuracy of the transfer

The printing unit is a direct printing part of the graphic and text, and any of the mechanical errors will affect the accuracy of the printed matter. The fault is mainly composed of roller bearing wear, pressure linkage clutch or copper sleeve bearing severe wear, the edition pin loosening or improper installation, alignment adjustment mechanism parts wear, transmission parts wear, potentiometer failure caused by. These failures are not common, but in the basic rule out tension factor