| 摘要 |
PROBLEM TO BE SOLVED: To avoid local damage and wear of a recording head and lengthen a life of the recording head by setting a plurality of arrays of opening parts at an aperture electrode body, moving the aperture electrode body to a toner feed mechanism and freely changing the arrays of opening parts to be used for recording. SOLUTION: An image-recording unit 40A is obtained by forming a toner feed machine 50 and an aperture holder 90 with an aperture electrode body 60 added thereto, etc. into a unit. In this case, the aperture electrode body 60 consists of a plurality of arrays of opening parts (apertures) 62 and a linear control electrode, etc. The aperture holder 90 is set rotatably about a center hole 91. When the aperture holder 90 is rotated at the maintenance time before and after printing, an opposite face of the aperture electrode body 60 to a holding roller 64 is freed and can be cleaned. When the aperture holder 90 itself is made movable to sequentially change the aperture arrays of the aperture electrode body 60 to be used, a life can be extended by a count of the arrays. |
