Electrostatic photocopying apparatus with improved developer supply means

An electrostatic photocopying apparatus comprising:

• a photosensitive body having a photoconductive material thereon;
• means for transporting said body along a path;
• A supply device positioned along said path for uniformly covering said body with image forming particles which are to be subsequently exposed and then developed, said supply device having a multi-stylus electrode including a plurality of stylus-like electode elements supported in position with the tips of the respective electrode elements positioned adjacent the body and across the body in the width direction of the body, means for applying to said electrode a voltage of a polarity opposite to the polarity of the charge on said body for causing the image forming particles to adhere to said body, means for supplying the image forming particles to the multi-stylus electrode;
• and a singlelayer producing means positioned along said path subsequent to the multi-stylus electrode in the direction of transportation of the body for removing from the body the image forming particles which do not directly contact the body thereby leaving only a single layer of particles.