After obtaining the official patent certificate of Jenny's textile machine, what troubles did james hargreaves encounter in the process of selling and manufacturing Jenny's textile machine?

After obtaining the official patent certificate of Jenny Spinning Machine, james hargreaves began to manufacture and sell Jenny Spinning Machine in large quantities. But in the process of selling Jenny's machine, I was in trouble again. Jenny's machine is easy to copy because of its simple structure. As a result, after some manufacturers bought this new spinning machine, they quickly copied it themselves and popularized it. However, they did not pay Hager the use fee according to law. In order to protect his patent right, Hargreaves had to fight against the illegal behavior of those manufacturers. He spent a lot of money in the process of suing these people. It turned out that Hargreaves made a lot of money by manufacturing and selling a large number of Jenny spinning machines after moving to Nottingham for a period of time. However, in order to go to court, a lot of money has been invested in this area.