Paper arranging device, and electrophotographic image forming apparatus with the same

An electrophotographic image forming apparatus comprising:

• a light scanning device to irradiate light corresponding to an image signal;
• a photosensitive medium on which a latent image is formed when the photosensitive medium is exposed to the light irradiated from the light device;
• a paper arranging device comprising:
• a driving roller and an idle roller which are positioned before the photosensitive medium along a path of paper, the driving roller and the idle roller disposed adjacent to each other to form a nip,
• a first sensor to sense a location of the moving paper, and
• a lever having a first end which extends to a perimeter of the nip to block a tip of the paper moving toward the nip and a second end which extends to a perimeter of the first sensor, the lever being installed to be rotatable with respect to a predetermined pivot axis between the first end and the second end of the lever,
• wherein when the first end of the lever is pressed by the tip of the paper and reaches a first position, the first sensor determines that the tip of the paper is entering the nip and generates a first sensing signal, and
• when the one end of the lever is pressed by the tip of the paper and reaches a second position farther along the path of the paper from the first position, the first sensor determines that the tip of the paper has passed through the nip and generates a second sensing signal;
• and
• a controller to control times when the driving roller rotates and when the photosensitive medium is exposed to the light based on the first sensing signal and the second sensing signal output from the first sensor.

A paper arranging apparatus usable with an image forming apparatus, comprising:

• a driving roller and an idle roller to transfer paper along a nip disposed on a paper path;
• a lever to move between positions disposed opposite to each other with respect to the nip by a force of the paper;
• and
• a first sensor to sense the positions of the lever, and to generate a plurality of sensing signals corresponding to the sensed positions.

An electrophotographic image forming apparatus, comprising:

• a developing unit to develop a latent image into a visual image and to transfer the visual image to paper;
• and
• a paper arranging unit disposed ahead of the developing unit on a paper path to arrange to paper and transfer the paper to the developing unit, the paper arranging unit comprising:
• a transfer unit to transfer the paper to the developing unit along a nip disposed in the paper path,
• a lever to move between first and second positions disposed opposite to each other with respect to the nip by a force of the paper, and
• a first sensor to generate first and second sensing signals corresponding to the first and second positions of the lever.