Three Little Printing Experiences

One example of troubleshooting paper feed skew

A Roland 702 offset press of our company has often experienced paper skew. The amount of slanting starts is small and can be solved by adjusting the tightness of the transfer belt and the amount of air suction. However, after a period of time, the paper feed skew error reappeared, and the slanting amplitude was larger than the previous time. Adjusting the transfer belt to the tightest and the amount of suction to the maximum did not work. Adjust the unilateral pressure roller, with the help of the front suction and the rear suction, still no effect. Due to business constraints, ramps have little impact on printing, so they have been dragged and not resolved. After a period of time, the slanting amplitude is larger, and the machine is often stopped due to oblique slumping, which seriously affects normal production and print quality.

Because adjusting all of Feida's operable parts does not work, it is considered that the fault is caused by mechanical reasons. After the above adjustment was reset, the operator measured the conveyer belt on the feeder part of the machine. As a result, he found that the two conveyer belts were turned one back and forth at the same time, which was different by 6 mm. Therefore, it was suspected that the conveyer belt was aging. Replaced the slower transfer tape and restarted the trial printing. The sheet transfer sheet was still not removed, and the two transfer tapes were still 5 mm apart. Therefore, the problem was not identified in the transfer tape.

For this thorny problem, the operator had to follow the steps and check all the mechanical parts related to the transfer belt. It was found that the paper transfer belt under the transfer paperboard was under normal adjustment, but it was not able to adjust such a large range; the bearings on both sides of the front gauge were basically similar. Looking up again, it was found that the top side of the transfer belt was a rubber sleeve. And you can adjust the diameter over the universal shaft. After adjusting the boot test, troubleshooting.

Through this breakdown, we learned a lesson. When introducing new products and new equipment, we should provide some training to the operators so that they can fully understand, familiarize with, and master the mechanical structure adjustment method of the entire machine and some common parts and components. Role, to prevent unnecessary trouble caused by improper adjustment of the machine.


(Zhejiang Aidier Packaging Group Co., Ltd. Wang Jianming Wang Guomin)