A supplying electrode (61) to be electrically connected to a supplying roller shaft (A2) is provided with a supplying roller shaft insertion part (65) that is to be externally fitted (fitted from the outside in the radial direction of the supplying roller shaft (A2)) onto the supplying roller shaft (A2). The supplying electrode (61) is constructed so as to move in the radial direction of the supplying roller shaft (A2) (the direction connecting the upper front side and the lower rear side) as the supplying electrode moves in the axial direction (left-to-right direction) of a supplying roller (33) when contacting a body-side supplying electrode (117).
