Thermal expansion compensation for printhead assemblies

(57) The print head assembly object (1) for a summary digital ink jet printer has the print head (2) which can be attached to a support component (3) fixable in this printer, and a support component (3). A support component (3) demarcates at least one ink reservoir (6, 7, 8, 9) in the core element (5) 囲包 (ed) in shell (4). The material and structure of shell (4) and a core (5) are selected so that the thermal expansion coefficient as the whole support component (3) may become equal substantially with the thermal expansion coefficient of the print head (2).