Majorly it falls under HSN 84439990. You may also search HSN Code specifically on the basis of exact photocopier or xerox machine in chapter 84 i.e. in 8443.
Yes while filing the form of gst, In goods and services tab you have to enter 4 digit chapter number i.e 8443 and then in second column of product code again enter this number, there will show a list and select your product from there.
Sale of Machinerys like Lathe, Milling, Sheet Cutting, Sheet Bending, Surface grinding, Cylinder grinding for this machines which should be taken in Gst Commodity