| 摘要 |
PROBLEM TO BE SOLVED: To prevent separation and insufficient contact of a toner flow control means from a toner hold means, form images without missing of image lines or density irregularities, prevent a toner from adhering to the toner flow control means and improve durability in an image formation apparatus. SOLUTION: A print head 1 as a means for controlling a toner flow has control electrodes 4 disposed from the downstream side in a toner feed direction and dummy electrodes 5 from the upstream side. A contact pressure between the print head 1 and a toner hold roller becomes uniform, so that the print head 1 is hard to separate from the toner hold roller or contact insufficiently with the toner hold roller. The toner held by the toner hold roller slides in touch with the print head 1, with receiving a mechanical action and being freed from an adhesion force by the toner hold roller. Accordingly, the toner flow can be controlled surely. |
