Quick detachable printer of POS system

The utility model relates to a quick detachable printer of POS system, it contains: once the casing, one go up the casing, this time casing has a left side limit and a right side limit, is equipped with one on these sides respectively and suppresses the subassembly, should suppress the subassembly and have a fixing base and an extensible member, and this extensible member telescopic is inserted and is established on this fixing base, should go up the casing and have a left side wall and a right side wall, is formed with an opening that matees these extensible members on these lateral walls respectively, and solid in these openings with these extensible member cards that suppress the subassembly, the messenger should go up the casing and close with this inferior valve body group, suppress the extensible member on the subassembly through this, make these extensible members easily break away from or to block admittedly on these openings, because this epitheca can easily be dismantled for the combination of this printer is more simple, in order to reach the purpose that promotes the printer packaging efficiency.