JPH043318Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to the positioning of a transfer device that transfers an image on a photoreceptor to a sheet of paper in a method in which a copying machine is separated into upper and lower sections along a paper conveyance path.

<Prior art> An electrophotographic copying machine has a charging section, an exposure section, a developing section, a transfer section, a static elimination section, a cleaning section, etc. arranged around a drum-shaped photoconductor, and also transfers paper between the transfer section and the photoconductor. It has a conveyance system that conveys the image to the printer and discharges it to the outside of the copying machine after the transfer. Further, the paper conveyance system is provided with a fixing section for fixing an image (toner image) on the paper between the transfer section and the discharge section.

In such a copying machine, if paper becomes jammed during transportation, the exterior of the copying machine is opened to expose the inside of the copying machine to some extent, and the jammed paper is removed. Therefore, in order to make it easier to remove jammed paper, etc., copying machines have been realized in which the main body of the copying machine is separated into upper and lower parts along the paper conveyance path. In this case, the upper main body holds the photoreceptor, and the charging section, exposure section, developing section, neutralization section, cleaning section, etc. arranged around the photoreceptor are held on the upper main body side at the same time.
However, the transfer section is attached to the lower main body side.
This is because the conveyed paper passes between the photoreceptor and the transfer section, so the transfer section and the photoreceptor are separated to facilitate jam removal.

Therefore, every time you separate the copy machine into its upper and lower parts,
There is a possibility that the distance between the photoreceptor and the transfer section, that is, the position of the transfer section may be misaligned. If a positional shift occurs in the transfer section, the conditions for transferring the toner image onto the conveyed paper will naturally change significantly, resulting in a transfer failure. Furthermore, it is conceivable that the conveyance path of the paper changes due to the positional shift of the transfer section, resulting in frequent occurrence of paper jams. Therefore, each time the copying machine main body is separated into the upper and lower parts, it is necessary to adjust the position of the transfer section, which results in a very troublesome scanning operation.

<Purpose of the invention> The purpose of the invention is to ensure the positioning of the photoreceptor and the transfer section, as well as the photoreceptor and the paper conveyance path, when the copying machine is closed, in a copying machine that is installed vertically and separably. It is said that

<Embodiment> FIG. 1 is a perspective view showing a copying machine according to the present invention that can be separated into upper and lower parts in an open state. The figure is illustrated without the exterior. Frame 11 in the diagram
The upper frame 12 is pivotally supported on the paper feeding side, and the upper frame 12 is always urged upward by a separation spring 16. Manual feed paper guides 17, 170 are fixed to the paper feed side of the lower frame 11, and one conveyance roller 18 for conveying the paper is rotatably held between these guides 17, 170. There is. The frame 11 also includes a guide plate 19 that guides the paper toward the photoconductor surface, a conveyance roller 20, a transfer charger (transfer device) 14 that faces the photoconductor 13, a conveyance belt 21 that conveys the paper, a fixing roller 23, and one side. The paper ejection roller 24 is held.

The other of the guide plates 17, 170, 19, the transport rollers 18, 20, and the discharge roller 24 are held facing the upper frame 12, respectively. The upper frame 12 holds a photoreceptor drum 13 and also holds various copying steps for image formation provided opposite to the photoreceptor. Further, the upper frame 12 movably holds a document table 25 and also holds an illumination device (not shown) for illuminating the document on the document table 25. In the figure, reference numeral 26 denotes a static elimination lamp that eliminates static electricity from the photoreceptor.

In the configuration described above, the transfer device 14 is
As shown in the perspective view and in FIGS. 3 and 4, it is attached to a movable arm 30 that is rotatably supported on the lower frame 11. This movable arm 30
A connector 31 for supplying high voltage to a corona discharge wire stretched between both insulating members 142 and 143 of a shield case 141 constituting the transfer device 14 is fixed to one of the two. The wire of the transfer device 14 of this connector 31 is electrically connected. Both insulating members 14 of the transfer device 14
A positioning convex portion 140 is integrally formed on the photoreceptor 2,143 in order to always keep the distance between the transfer device 14 and the photoreceptor 13 constant. This convex portion 14
0 is provided so as to be in contact with the upper frame 12.

On the other hand, a spring 32 is attached between one end of the movable arm 30 and the lower frame 11, and the transfer device 14 is normally urged toward the photoreceptor 13 by the spring 32. Further, the movable arm 30 has a regulating piece 3 for regulating rotation beyond a predetermined level when the upper frame 12 of the copying machine main body is opened.
3 are integrally formed. This regulating piece 33 is inserted into a hole 110 bored in the lower frame 11, and the movable arm 30 is inserted into the hole 110.
rotation is regulated. Further, according to this embodiment, a paper guide 19 for guiding the paper between the photoreceptor 13 and the transfer device 14 is fixed to the movable arm 30. If the photoconductor 13 and the transfer device 14 are properly positioned, the paper guide 19 can naturally guide the paper between them accurately. Therefore, it is possible to always maintain an accurate positional relationship in the direction of the rotating photoconductor. I can guide you. In the figure, reference numeral 21 denotes a conveyance belt for conveying the paper to the fixing roller 23, which sucks the paper onto the belt from the back side and conveys the paper by driving the belt. The conveyance means by the conveyor belt 21 is fixed at a fixed position on the lower frame 11.

According to the configuration described above, the upper frame 12 is opened as shown in FIG. 1 during maintenance and inspection of the copying machine or when jamming paper. At this time of opening, the movable arm 30 is regulated by the regulating piece 33 and maintained in the state shown in FIG. 4. In other words, the photoreceptor 13 is separated from the transfer device 14 by a larger distance. However, it is clear that no misalignment occurs between the photoreceptor 13 and the devices disposed facing each other other than the transfer device 14.

Then, when the maintenance inspection or jam processing inside the copying machine is completed, the upper frame 12 is closed to the lower frame 11. When the upper frame 12 is closed, the convex portion 140 for positioning the transfer device 14 is pushed by the upper frame 12, and the movable arm 30 and the transfer device 14 are pushed together.
is pushed downward. This closed state is as shown in FIG. At this time, the transfer device 14 is urged upward together with the movable arm 30 by the spring 32, and the positioning convex portion 140 and the upper frame 1
2 is always in contact with the photoreceptor 13 and is always positioned at a fixed position. In particular, the positional distance between the photoreceptor 13 and the transfer device 14 is always kept constant. Therefore, even if the upper and lower frames 11 and 12 are separated and then closed again, the photoreceptor 13 of the transfer device 14
The position of the transfer device 14 is the same as before separation, and there is no need to adjust the position of the transfer device 14 after separation. Also,
The lower guide plate 19 for guiding the paper also has no misalignment with the photoreceptor 13, and can always guide the paper toward the photoreceptor 13 in a normal state.

According to an embodiment of the present invention, the upper guide plate 19
Although 0 is fixed to the upper frame 12,
It may be attached to the lower frame 11 side, and furthermore, although the conveyance roller 20 is also provided separately on the upper and lower frames 11 and 12, both rollers 20 may be provided on the lower frame 11 side.

Although the transfer device 14 is provided with a protrusion 140 for positioning, the object of the present invention can also be achieved by providing a positioning means on the movable arm 30 and having the upper frame 12 abut against it. is not limited.

<Effects of the invention> According to the transfer device positioning device of the present invention, in a copying machine configured such that the top and bottom can be separated, the transfer device and the photoreceptor can be accurately positioned, thereby preventing transfer defects. .

In addition, since the paper guide and photoconductor are accurately positioned at the same time as the transfer device, there is no misalignment between the photoconductor and the paper transport path, and the paper is always kept in an accurate positional relationship in the direction of the photoconductor. As a result, frequent occurrence of transfer misalignment jams can be prevented.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the open state of the copying machine with the upper and lower separated structure according to the present invention, Fig. 2 is a perspective view showing the positioning mechanism of the transfer device in the present invention, and Fig. 3 is the closed state of the copying machine main body. Similarly, FIG. 4 is a side view showing the positioning state of the copying machine main body when it is opened. 11...Lower frame, 12...Upper frame, 1
3...Drum-shaped photoreceptor, 14...Transfer device, 14
0...Protrusion (for positioning), 19...Lower guide plate,
30...Movable arm, 32...Spring, 33
...Regulation piece.

Claims (1)

[Claims for Utility Model Registration] The main body of the copying machine is separable into an upper frame and a lower frame. In a copying machine that is equipped with a transfer device that transfers a latent image formed on a body onto paper and a lower paper guide, the transfer device and a photoreceptor are mounted on an insulating member that supports a corona discharge wire of the transfer device. A movable arm for attaching the transfer device is rotatably provided on the axis of the lower frame, and the movable arm is attached to the movable arm. and a paper guide on the upstream side of the photoreceptor among the lower paper guides, and when the upper frame and the lower frame are closed, the upper frame The positioning means is pushed in the direction opposite to the urging direction of the urging means, and the transfer device is positioned relative to the photoreceptor, and at the same time, the positioning means is pushed in the direction opposite to the urging direction of the urging means, and at the same time, the transfer device is positioned relative to the photoreceptor, and at the same time, the positioning means is pushed in the opposite direction to the urging direction of the urging means. A positioning device for a transfer device, characterized in that a paper guide is positioned with respect to a photoreceptor.