Developing device
A technology of developing device and developing agent, which is applied in the direction of instruments, electric recording technology using charge pattern, optics, etc., and can solve problems such as inhomogeneity
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Embodiment 1）
[0027]
[0028] figure 1 It is an illustration of the structure of the imaging device. figure 2 with image 3 This is an illustration of the structure of the developing device. Such as figure 1 As shown, the image forming apparatus 100 is a tandem intermediate transfer type full-color printer in which image forming portions Pa, Pb, Pc, and Pd for different colors are provided along the intermediate transfer belt 5. Along the intermediate transfer belt 5 (intermediate transfer medium), together with the monochrome image forming section, a plurality of color (color) image forming sections are arranged.
[0029] At the image forming section Pa, a yellow toner image is formed on the photosensitive drum 1 a as an image bearing member, and then is primarily transferred onto the intermediate transfer belt 5. At the image forming portion Pb, a magenta toner image is formed on the photosensitive drum 1b as an image bearing member, and is then superimposed and primarily transferred onto t...
Embodiment 2
[0058] In the image forming apparatus described in Embodiment 1, in the case where the inclination of the groove of the developing sleeve is changed, the developing sleeve is different in developer feeding performance.
[0059] Regarding the feeding performance of the grooved sleeve, the (developer) feeding force acts on the groove with respect to the thrust direction. In the case of diagonal grooves, such as Image 6 As shown, when the angle between each groove formed in the developing sleeve and the thrust direction is θ (θa or θb), with respect to the vertical direction of the diagonal groove, the feed force corresponding to cosθ acts on the sleeve The direction of cylinder rotation.
[0060] Therefore, when the inclination (angle) of the diagonal groove changes, the feeding force of the developing sleeve also changes, and therefore the amount of developer conveyed on the developing sleeve also changes. When the amount of developer on the developing sleeve changes, the developi...
Embodiment 3）
[0071] In addition to the rotation direction of the sleeve, the diagonal groove also has a feed force in the axial direction (thrust direction). Therefore, there is a possibility that during the conveyance of the developer on the developing sleeve, the developer is likely to be locally concentrated in one side of the developing sleeve with respect to the thrust direction. In Embodiment 1, the angles of the two oblique grooves are equal to or greater than 90 degrees, but in that case, the direction of the feed thrust of the developer on each developing sleeve becomes the same, so that the two developing sleeves During conveyance of the developer on the sleeve, the developer is more likely to be concentrated locally. When the developer is locally concentrated, there is a possibility that the developer leaks to the outside of the feeding area at the end of the sleeve.
[0072] Therefore, in this embodiment, as Figure 8 As shown in, the angle of the diagonal grooves of the upstream...
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