JPH0267362U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a developing device 1 according to an embodiment of the present invention installed in a laser printer 2, FIG. 2 is a diagram showing the configuration around the developing device 1 and the photosensitive drum 3, and FIG. is a perspective view showing a partial cross section of the developing device 1, FIG. 4 is a side view of the developing device main body 41 seen from one side, FIG. 5 is an exploded perspective view of FIG. 4,
6 is a side view of the developing device main body 41 seen from the other side, FIG. 7 is an exploded perspective view of FIG. 6, and FIG. 8 is a sectional view of the developing roller 19 attached to the developing device 1.
9 shows the arrangement relationship between the developing roller 19 and the photosensitive drum 3, and FIG. 10 shows the lid 42 of the developing device 1.
FIG. 11 is a perspective view of the lid 4 as seen from the bottom surface 42b side.
12 is a perspective view showing a part of the lid 42 to which the lower registration roller 32 is attached; FIG.
The figure is an exploded perspective view of the lid 42, cover body 38, upper registration roller 31, and lower registration roller 32 of the developing device 1. 1...Developing device, 2...Laser printer, 3...
...Photosensitive drum, 18...Main corona charger, 19
...Developing roller, 23...Corona charger, 31...
... Upper registration roller, 32 ... Lower registration roller, 33 ... Static elimination lamp, 38 ... Cover body, 39
...Protrusion, 41...Developing device main body, 42...Lid,
43a, 43b...Supporting member, 44a, 94...
Torsion spring, 47...ear cutting member, 48a, 48b
...Plate spring, 49...Sheet body, 52a, 52b
...Support tube, 59a, 59b...Support roller, 6
0a, 60b... Spring bearing roller, 63... Sleeve, 64... Permanent magnet piece, 72... Magnet roller, D1... Diameter of sleeve 63, D2... Diameter of support rollers 59a, 59b, d1... Diameter of shaft 65 of magnet roller 72, d2...inner diameter of bearings 66b, 73 of end members 66, 67, Q...rotational axis of supporting members 43a, 43b, Δ...photosensitive drum 3 and developing roller 19 interval.

Claims (1)

[Scope of Claim for Utility Model Registration] In a developing device that uses a developing roller to apply a developer to a photoconductor on which an electrostatic latent image is formed to visualize the image, the main body of the developing device is fixed to a machine body, and the photoconductor a cylindrical body which is rotatably supported, has a rotational axis parallel to the rotational axis of the photoreceptor, is made of a metal material, is driven to rotate about the rotational axis, and to which a predetermined voltage is applied; A developing roller disposed inside the body and equipped with magnetic force means magnetized at multiple locations along the circumferential direction is biased against the photoreceptor by a spring, and the outer diameter of the developing roller is larger than the outer diameter of the developing roller by a predetermined specific amount. A support roller having an outer diameter is disposed at a position coaxial with the developing roller and in contact with the outer circumferential surface of the photoreceptor, and is applied to the cylindrical body via a spring means made of a metal material that biases the developing roller. A developing device characterized by applying a voltage.