Device for attaching a doctor blade on a body of a doctor blade chamber, characterised in that the device for attaching comprises - at least one clamping flange configured to press the doctor blade on the body of the doctor blade chamber, - at least one first attachment member, and - at least one second attachment member, configured to cooperate with the first attachment member, the flange being arranged between the first attachment member and the second attachment member, wherein the first attachment member comprises at least one first retaining section having an upper end and a lower end, a second section different from the first retaining section, and wherein the second attachment member comprises at least one first portion having at least one retaining element, a second portion having at least one retaining element, an intermediate portion having no retaining element and arranged between the first portion and the second portion, the second attachment member being mobile in the first attachment member between at least: - a first blocking position wherein the second portion cooperates with the first retaining section of the first attachment member, and the first portion is arranged in the second section, - a second unblocking wherein the intermediate portion is positioned at the first retaining section and is free to slide with regards to the first retaining section along a longitudinal axis (A-A), between a first end position according to which the second portion is in abutment on the upper end of the first retaining section, and a second end position according to which the first portion is in abutment on the lower end of the first retaining section. - at least one clamping flange configured to press the doctor blade on the body of the doctor blade chamber, - at least one first attachment member, and - at least one second attachment member, configured to cooperate with the first attachment member, the flange being arranged between the first attachment member and the second attachment member, wherein the first attachment member comprises at least one first retaining section having an upper end and a lower end, a second section different from the first retaining section, and wherein the second attachment member comprises at least one first portion having at least one retaining element, a second portion having at least one retaining element, an intermediate portion having no retaining element and arranged between the first portion and the second portion, the second attachment member being mobile in the first attachment member between at least: - a first blocking position wherein the second portion cooperates with the first retaining section of the first attachment member, and the first portion is arranged in the second section, - a second unblocking wherein the intermediate portion is positioned at the first retaining section and is free to slide with regards to the first retaining section along a longitudinal axis (A-A), between a first end position according to which the second portion is in abutment on the upper end of the first retaining section, and a second end position according to which the first portion is in abutment on the lower end of the first retaining section. wherein the first attachment member comprises at least one first retaining section having an upper end and a lower end, a second section different from the first retaining section, and wherein the second attachment member comprises at least one first portion having at least one retaining element, a second portion having at least one retaining element, an intermediate portion having no retaining element and arranged between the first portion and the second portion, the second attachment member being mobile in the first attachment member between at least: - a first blocking position wherein the second portion cooperates with the first retaining section of the first attachment member, and the first portion is arranged in the second section, - a second unblocking wherein the intermediate portion is positioned at the first retaining section and is free to slide with regards to the first retaining section along a longitudinal axis (A-A), between a first end position according to which the second portion is in abutment on the upper end of the first retaining section, and a second end position according to which the first portion is in abutment on the lower end of the first retaining section. - a first blocking position wherein the second portion cooperates with the first retaining section of the first attachment member, and the first portion is arranged in the second section, - a second unblocking wherein the intermediate portion is positioned at the first retaining section and is free to slide with regards to the first retaining section along a longitudinal axis (A-A), between a first end position according to which the second portion is in abutment on the upper end of the first retaining section, and a second end position according to which the first portion is in abutment on the lower end of the first retaining section.