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Image forming apparatus

An image and equipment technology, applied in the field of image forming equipment, can solve problems such as instability and fluctuations

Inactive Publication Date: 2011-05-25
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Then, when measuring the potential at each position along the transfer belt 15 from the attraction portion to the transfer portion, as Figure 5 As shown in (a)-5(d), it has been found that the potential fluctuates unstably at each position of the transfer belt 15

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Image 6 (a) and Image 6 (b) is an illustration of the electrode arrangement on the upstream side of the secondary transfer portion in Example 1. Figure 7 is a graphic illustration of the effect of the potentiometric plate. Figure 8 (a) and Figure 8 (b) is a diagram each showing an equivalent circuit on the periphery of the potential regulating plate. Figure 9 (a) and Figure 9 (b) is a graphical representation of the comparison of potential measurements in the absence and presence of a potential-regulating plate, respectively.

[0082] Such as figure 1 As shown, the transfer belt 15 extends around and is supported by the separation roller 26, the tension roller 27, and the entrance roller 25, which also serve as driving rollers, and is driven by the separation roller 26 so that the transfer belt 15 The printing belt 15 rotates at a process speed of 250-300 mm / sec in the direction indicated by the arrow R3.

[0083] The attraction roller 33 that controls th...

Embodiment 2

[0112] Figure 10 is an illustration of the structure of the image forming apparatus in Embodiment 2. Figure 11 (a) and Figure 11 (b) is an illustration of the electrode arrangement on the upstream side of the secondary transfer portion in Example 2. Figure 12 is a graphic illustration of the effect of the potentiometric plate. Figure 13 (a) and Figure 13 (b) is a diagram each showing an equivalent circuit on the periphery of the potential regulating plate. Figure 14 (a) and Figure 14 (b) is a graphical representation of the comparison of potential measurements in the absence and presence of a potential-regulating plate, respectively.

[0113] In addition to the voltage application method at the secondary transfer portion T2 and the arrangement of the potential regulating plate, figure 1 The image forming apparatus 100 shown in and Figure 10 The configuration of the image forming apparatus 100A shown in is equivalent. For this, in Figure 10 in, with figure...

Embodiment 3

[0134] Figure 15 is an illustration of the structure of the image forming apparatus in Embodiment 3. Figure 16 (a) and Figure 16 (b) is an illustration of the electrode arrangement on the upstream side of the secondary transfer portion in Example 3. Figure 17 is a graphic illustration of the effect of the potentiometric plate. Figure 18 (a) and Figure 18 (b) is a graphical representation of the comparison of potential measurements in the absence and presence of a potential-regulating plate, respectively.

[0135] by putting Figure 10 The potential adjustment plate 35 of the image forming apparatus 100A shown in the figure 1 The image forming apparatus 100B in this embodiment is constituted in the image forming apparatus 100 shown in . The other configurations are the same as in Embodiment 1, and the configuration and arrangement of the potential regulating plate 35 are the same as in Embodiment 2. Thus, in Figure 15 in, with figure 1 with Figure 10 Constit...

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Abstract

An image forming apparatus includes an image bearing member; an image forming portion for forming a toner image on the image bearing member; an intermediary transfer belt for carrying the toner image transferred from the image bearing member; a transfer belt for carrying and conveying a recording material; an attraction portion for electrostatically attracting the recording material to the transfer belt; a transfer portion for transferring the toner image from the intermediary transfer belt onto the recording material attracted to the transfer belt; and an electrode member, disposed downstream of the attraction portion and upstream of the transfer portion with respect to a movement direction of the transfer belt, being contacted to an inner surface of the transfer belt.

Description

technical field [0001] The present invention relates to an image forming apparatus that transfers a toner image onto a recording material that is electrostatically attracted to a transfer belt, and particularly relates to a method for suppressing discharge and adjustment on the upstream side of a transfer portion of a toner image Toner scattering (scattering) structure. Background technique [0002] A transfer belt type image forming apparatus in which a plurality of image forming portions different in development color are arranged along the transfer belt has been put into practical use (Japanese Patent Application Laid-Open (JP-A) 2007-003634). Intermediate transfer and transfer belt types that primarily transfer a toner image formed by an image forming portion onto an intermediate transfer belt and then secondarily transfer from the intermediate transfer belt onto a recording material carried on the transfer belt The image forming apparatus of has also been put into prac...

Claims

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Application Information

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IPC IPC(8): G03G15/16
CPCG03G15/1695G03G15/1605G03G2215/1666G03G15/1615
Inventor 高柳浩基
Owner CANON KK
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