Abstract: The print head (9) disposed on a print-head carriage (8) can be moved back and forth parallel to a print support (13) between end positions (8a, 8b) and can be set perpendicular to the print-surface support (13) against a spring force of, for example, a leg spring (14) relative to the print surface support (13) in the context of a device for the setting of the distance of a print head (9) on a thick print material (10) in an office machine, in particular in a printer for savings booklets or vouchers.In addition, at least one rotatable roller (15), supported at the print-head front face (9a), is provided, which roller rests on a bendable strip (16) running in parallel to the print surface support (13), where the bendable strip (16) rests solidly on the thick printing material (10) during the printing process.

Abstract: A printer, and in particular a matrix printer, is provided with a carriage guide running parallel in front of a print-surface support for a print-head carriage (3). The print-head carriage (3) supports a print head (4) and an ink-ribbon guide (8), disposed on the print-head carriage (3). The print head (4) can be exchanged even by the operating personnel of the matrix printer by using a print head (4) which is exchangeable in a mechanical guide (6) and which is connected with an electric plug connection (7) and is thus removable and again insertable into the print-head carriage (3). At least one tiltable ink-ribbon guide (8) is disposed on the print-head carriage (3) and serves as a locking means (9) for the inserted print head (4) on the print-head carriage (3).