The bottom ash scraper in the picture is very likely to cause the problem (it is recommended to replace the scraper and the drum core at the same time, as the lifespan can be extended).
A copy machine is a device that produces equal, enlarged or reduced copies from a written, drawn or printed original. Copiers copy quickly and are easy to operate. The main difference from traditional type printing, wax paper printing, offset printing, etc. is that they can obtain copies directly from the original without going through other intermediate means such as plate making. It is more economical when the number of copies is not large.
The invention of the copying machine: In the 1800s, James Watt of Birmingham, England invented the letter copying machine, which was the predecessor of today's digital copying machine.
The inventor of the copier, Chester Carlson, was originally a patent lawyer, part-time researcher and inventor. His job at the New York Patent Office required the copying of numerous important documents. Carlson suffered from arthritis and found copying files a painful and monotonous task. This encouraged him to conduct experiments on photoconductivity, estimating that it would be easiest to make photocopies.
Carlson conducted electrophotography experiments in the kitchen of his home and applied for a patent for the process technology in 1938. He made the first copies using sheets of zinc masked with sulfur.