A printer includes: a housing, a print space within the housing, a print head, a replaceable ink ribbon cassette, a receiving device for a printable object which is to be printed, a control and evaluation unit, and an input and display apparatus. The receiving device can travel between a loading and unloading position outside the print space and a print position within the print space.A print head holder on whose bottom the print head is attached is pivotably mounted in the housing. In the closed position of the print head holder the print head is located in a working position above the ink ribbon cassette. In a swung-up position of the print head holder an ink ribbon cassette can be inserted into the housing or can be removed from the housing. At least one spring arm is formed on the top of the ink ribbon cassette or on the bottom of the print head holder.