its common thing in epson dotmatrix printer, when you try to print more than 2/3 papers as it becomes thicker, for example making 4/5 copies of invoices, the ribbon popout again & again,
as shown in the image below
Epson Dotmatrix Printer Ribbon Problem
solution is very easy, there is one liver on left side, move it to 4/5 number, it will increase space between print head & roller , and the thickness of paper wont take the ribbon out.
ribbon shown in following image
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