live device
A charging roller and hole technology, applied in corona discharge devices, circuits, electrical components, etc., can solve the problems of uneven charging of the photoreceptor, damage to the charging reel, and the cleaning state of the charging reel cannot be kept uniform, so as to suppress the charging. Unevenness, the effect of suppressing accumulation of dirt
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no. 1 approach
[0091] Next, details of the charging device 50 which is a main part of the present invention will be described with reference to the drawings. image 3is a schematic perspective view of the charging device of the present invention, Figure 4 is a side view of the cleaning roller. exist image 3 The photosensitive drum 11 is described in the charging device 50 shown.
[0092] The charging roller 51 contacts the photosensitive drum 11 to charge the photosensitive drum 11 . Since the charging device 50 is arranged on the downstream side of the cleaning unit 43 , residual toner and the like on the surface of the photosensitive drum 11 can be removed by the cleaning unit 43 . However, toner contains silicon dioxide (SiO 2 ), titanium (Ti), calcium (Ca) and other external additives may pass through the cleaning part 43 and reach the charging device 50 because the particle size of the external additive is small. If such external additives accumulate as dirt, they cause uneven ch...
no. 2 approach
[0122] As shown in the first embodiment, in the cleaning roller 60 having the foamed elastic body 62, by making the change rate of the average diameter of the cavities 63 in the center of the kneading part with respect to the average diameter of the cavities 63 just entering the kneading part 1.4 or more and 3.0 or less maintains cleaning performance and ensures durability.
[0123] As a result of further research by the inventors of the present invention, it has been found that in a cleaning roller equipped with a foamed elastic body, the greater the rate of change in the direction of rotation, the higher the cleaning performance, that is, the cleaning performance can be maintained even if the number of printed sheets increases. performance. Such a cleaning roller capable of increasing the rate of change in the rotational direction of the holes will be described with reference to the drawings.
[0124] Figure 7 It is an enlarged view of a cleaning roller used in the chargi...
no. 3 approach
[0130] Another example of the cleaning roller used in the charging device of the present invention will be described with reference to the drawings. Figure 8 It is an enlarged view of a cleaning roller used in the charging device of the present invention. Figure 8 One axial end of the cleaning roller 60B is shown enlarged. Figure 8 The cleaning roller 60B shown has the same structure as the cleaning roller 60 except that the holes 63 formed in the foamed elastic body 62B are provided with notches 631 . Therefore, the same reference numerals are assigned to the same parts as the cleaning roller 60 , and detailed description of the same parts will be omitted.
[0131] Figure 8 The cleaning roller 60B shown has a notch 631 formed perpendicular to the rotation direction at an end portion of the inner wall of the hole 63 perpendicular to the rotation direction in order to increase the rate of change in the rotation direction of the hole 63 . By providing such notches 631 , e...
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