| 摘要 |
PURPOSE:To prevent scattering of a developer so that output of high printing quality is obtd. by setting a switching means at a connected state and starting development at the point of the time when the electrostatically charged part on a body to be electrostatically charged arrives at a developing device after the impression of a voltage to an electrostatic charge is started. CONSTITUTION:The voltage is impressed to a TTLIC 20 and the TTLIC 20 outputs an H level when the body 12 to be charged rotates in the direction shown by an arrow B and the charged part on the body 12 arrives at the developing device. A transistor 17 is, therefore, disconnected and a transistor 12 is decreased in the base current, by which the potential difference between the collector and the emitter is increased and the developing bias voltage is impressed to a sleeve electrode 11. The splashing of the developer is thereby prevented and the output of the high printing image is obtd. |
