To stably supply electric power by preventing deformation of a brush in packing of the power supply brush for supplying electric power to a sheet carrying belt of a recorder.

A protective member 45 is folded in two so as to form a triangle together with a part of a shape according to the shape of the power supply brush 7 having a cross-sectional shape of an L shape, and this protective member 45 is fixed to the power supply brush 7. Since a part of the brush 41 is enclosed by the installation, some external force can be prevented from directly acting on a part of the brush 41.