Card reader and machine supplying a service comprising such a card reader

A card reader comprising

• a structure for receiving a card limited by a housing for the card and also a slot for insertion of the card into the housing, the receiving structure comprising a portion for guiding the inserted card to a position within the housing for reading the said card,
• a sweeper mounted so as to slide within the receiving structure from a rear position located opposite the slot and clear of the housing to a forward position within the housing close to the slot, the sweeper having a front surface covering at least part of the transverse cross-sectional surface area of the housing, and
• a mechanism for operating the sweeper to cause the said sweeper to slide from its resting position towards its forward position,
• the reader being wherein the front surface covers more than 50% of the transverse cross-sectional surface area of the housing, preferably more than 75%.