JPH0284668A - Carrying device for peeling sheet - Google Patents

Abstract

PURPOSE:To restrain triboelectrification against a sheet and to prevent repulsion due to electrostatic force and the scattering of toner by providing a rotor disposed freely and rotatably on a position where a carrying guide plate is brought into contact with and tightly adheres to a peeled sheet. CONSTITUTION:The peeled sheet 3 is attracted electrostatically to the carrying guide plate 8 and carried along the plate 8. When the sheet adheres to the plate 8 and is carried along the plate 8, the rotor 9 arranged in the position follows the carrying and rotates. Therefore, the sheet 3 and the carrying guide plate 8 in those positions are prevented from rubbing each other, thereby preventing triboelectrification. Since the rotor 9 rotates, following the carrying of the sheet 3, the triboelectrification between the rotor 9 and the sheet 3 hardly occurs. Since no electrified charges are produced on the carrying guide plate 9 and the rotor 9, toner on the sheet 3 is never scattered, and is carried normally.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to paper conveyance in an image forming apparatus, for example, an apparatus employing an electrophotographic method, and in particular, to paper conveyance in an image forming apparatus, for example, an apparatus employing an electrophotographic method. The present invention relates to a paper conveyance device.

<Prior art> An image forming apparatus, such as an electrophotographic copying apparatus, uses a recording medium (
An image (an image developed with toner) corresponding to the original to be copied formed on a photoreceptor is transferred onto a sheet of paper that is being transported as appropriate. The image formed on the photoreceptor is an electrostatic latent image corresponding to the original to be copied, developed using a coloring material such as toner, and transferred to a transfer material such as paper using electrostatic action. There is.

Here, when an image (toner image) on a photoreceptor is transferred to paper, the paper is brought into close contact with the surface of the photoreceptor by electrostatically transferring the toner onto the paper. In order to separate the paper from the photoreceptor, for example, as shown in FIG. 3, a separation belt 5 is interposed between the photoreceptor 1 and the paper 3, and after the transfer action of the transfer corona discharger 4, The paper 3 is held between a separation belt 5 and a separation roller 7 so as to be peeled off from the photoreceptor 1, and is strongly peeled off. The separation belt 5 is brought into close contact with the separation roller 7 and stretched so as to be in contact with the small diameter portion +01 of the pressure roller 10 which is in pressure contact with the separation roller 7. That is, the paper 3 is sandwiched between the separation belt 5 and the separation roller 7, and then between the separation roller 7 and the pressure roller 10. In particular, the separation belt 5 is disposed so as to correspond to one side edge of the paper 3 being conveyed, so that no image is formed on the photoreceptor 1 corresponding to this portion.

The negative edge of the paper 3 is more strongly separated by the separation belt 5 and separation roller 7 than the photoreceptor 1, but the opposite edge is separated from the photoreceptor a little later. The sheet of paper is gradually peeled off due to its own stiffness, and is guided and conveyed along the conveyance guide plate 8.

In the figure, 2 is a guide plate for guiding the paper 3 to the transfer position of the photoreceptor 1, and 11 and 12 are for transporting the paper 3 conveyed on the conveyance guide plate 8 to a fixing section (not shown). The upper and lower transport rollers are arranged in a positional relationship corresponding to the separation belt 5 and the separation roller 7.

<Problems to be Solved by the Invention> As described above, the paper 3 peeled off by the peeling means after transfer is charged by the corona discharger 4, electrostatically attracted onto the conveyance guide plate 8, and conveyed. It turns out. At this time, the paper 3 after peeling first comes into contact with the conveyance guide plate 8 near point A, and frictional charging occurs at this part. Due to the influence of this electrical charge, the transferred toner on the paper 2 is scattered, for example. Images may blur.

FIG. 4 is a block diagram showing the development in detail.

For example, if the photoreceptor l is negatively charged, when toner is attached to the formed negative latent image, the toner itself is positively charged. Therefore, in order to transfer the toner adhering to the surface of the photoreceptor 1 to the paper 3 side, the paper 3 is negatively charged with the corona discharger 4, and the toner is transferred to the paper 2 by electrostatic force. ing. At this time, by charging the paper 3 higher than the photoconductor 1, the photoconductor 1
The toner adsorbed on the paper 8 can be transferred to the paper 8. A large amount of electrical charges will remain on the paper 3 to which the toner has been transferred in this way, and after the paper 3 is peeled off, the paper 3 will be removed from the paper 3, especially at point A of the conveyance guide plate 8 formed of an insulator. The conveyance guide plate 8 is electrostatically brought into close contact with the area where the leading end of the sheet comes into contact for the first time, and is rubbed strongly, so that the conveyance guide plate 8 is frictionally charged.

In this case, the conveyance guide plate 8 is positively charged as shown in the figure.

The toner 18 on the paper 3 that is transported on the charged transport guide plate 8 as described above is positively charged, so it repels the positively charged charge on the transport guide plate 8, and the negative part is scattered 14. This caused the image to become distorted.

The purpose of the present invention is to suppress frictional electrification with the paper after peeling to the extent possible, prevent repulsion due to electrostatic force, and prevent toner scattering.

Means for Solving Problems〉 The conveyance device according to the present invention after peeling off the electrostatically transferred paper includes an insulating conveyance guide plate so as to electrostatically attract the peeled paper, and the conveyance device. The present invention is characterized by comprising a rotating body rotatably disposed at a position where the guide plate and the peeled paper come into contact with each other and come into close contact with each other.

<Function> According to the paper conveyance device after peeling of the present invention, the peeled paper is conveyed along the conveyance guide plate in an attempt to electrostatically adhere to the conveyance guide plate. At this time, when the paper is conveyed in close contact with the conveyance guide plate, the rotating body placed at that position is driven and rotates, so there is no friction between the paper and the conveyance guide plate at that position. This prevents triboelectric charging.

In addition, since the rotating body rotates as the paper is transported,
Almost no frictional electrification occurs between the rotating body and the paper.

Therefore, the toner on the paper is transported in a normal state without being scattered because no electrical charge is generated on the transport guide plate or the rotating body.

<Example> FIG. 1 is a side view schematically showing a copying apparatus equipped with a paper conveying device after peeling according to the present invention, and FIG. 2 is a perspective view showing the main parts of the conveying device of the present invention.

In the figure, 1 is a photoconductor, 2 is a guide plate for guiding the paper 3 to the transfer position of the photoconductor L, 4 is a corona discharger for transfer, and 5 is fixed at one end and biased by a spring 6 at the other end. a separation belt 7 that is pulled and pressed against the surface of the photoreceptor 1 at the transfer position;
Reference numeral 8 indicates a rotationally driven separation roller that holds the transfer sheet 8 between the separation belt 5 and the separation belt 5 in order to separate the transfer paper 8 from the photoconductor 1, and 8 indicates a plurality of conveyance guides arranged at equal intervals along the width direction of the paper conveyance. A plate 9 is rotatably provided to the conveyance guide plate 8 in the present invention, and a rotating roller 10 is a suppression roller that is pressed against the separation row 27.

The separation belt 5 and the separation roller 7 (including the pressure row 210) are arranged along one side edge of the paper 3, as in the conventional case, and sandwich the edge of the paper 3, and then the separation roller 27 and The paper 3 is forcibly peeled off from the surface of the photoreceptor 1 by being held between the suppression rows 2xo. For example, the separation belt 5, separation belt 7, etc. are arranged corresponding to one end edge on the back side in FIG. The separation belt 5 separates the photoreceptor 1 as shown in the figure.
It is in pressure contact with the separation roller 7 at a portion thereof, and is tensioned by a spring 6 so as to be in pressure contact with a small diameter roller 101 which is spaced apart from the separation roller 7 and coaxial with the suppression row 210 .

The conveyance guide plate 82 on the side corresponding to the separation belt 5 is
The transport guide plate 81 is formed to be lower than the transport guide plate 81 on the opposite side as shown in FIG. A rotating roller 9 is rotatably provided in the vicinity corresponding to point A). As shown in FIG. 2, the rotating rollers 9 rotate one
They are provided at regular intervals and are arranged on both sides of the conveyance guide plate 8. The rotating rollers 9 are not limited to the embodiment shown in FIG. 2, but may be provided on all the conveyance guide plates 8, and the rotation rollers 9 may be provided not only at one interval but at a considerable interval as long as the conveyance guide plate 8 is not charged by friction between the sheets 3. They may be arranged at intervals. Moreover, it may not be provided on both sides but may be provided on one side.

The conveyance guide plate 8 is, for example, integrally formed with a cavity 18 that forms the exterior of the copying machine main body, and as in the conventional case, as shown in FIG. (not shown) are arranged as necessary.

In particular, the conveyance guide plate 8 is similar to the cabinet 3, for example A
It is made of BS resin. Further, the material of the rotating roller 9 is a resin having a dynamic friction coefficient of 0.2μ or less and a friction coefficient of 200XlO''.

For example, there is a product name: HR-01 (Band Kagakuten), a highly slidable olefin resin, and the like.

In the apparatus configured as described above, the photoreceptor 1 is rotated in the direction of the arrow and charged to a specific polarity (for example, negative) by the main corona charger, and the image of the original to be copied is exposed. By this exposure, an electrostatic latent image corresponding to the exposed image is formed on the surface of the photoreceptor 1. This electrostatic latent image is then developed as a toner image by a developing device and sent to a transfer position where paper 8 is conveyed.

The paper 8 is fed, for example, by manual insertion or from a paper feed cassette by the action of the paper feed row 2 or the like, and is conveyed in synchronization with the rotation of the photoreceptor 1 via registration rollers (not shown). This paper 3 is guided to the surface of the photoreceptor 1 along the guide plate 2, and is charged (for example, negatively) by the charging action of the corona discharger 4, thereby causing the toner adsorbed on the surface of the photoreceptor 1 (for example, to be positively charged). (electrostatic charge) is transferred to the paper B side. At this time, although the paper 3 is brought into close contact with the photoreceptor I, the negative side edge portion is separated from the photoreceptor I by the separation belt 5.

Then, the paper 3 is further conveyed, its minus side edge portion is held between the separation belts 5 and 7, and it is forcibly peeled off from the photoreceptor l. This peeled paper 3 is conveyed so as to be electrostatically adhered to a conveyance guide plate 8 formed of an insulator.

At this time, the paper 3 comes into contact with a rotating roller 9 disposed near the conveyance guide plate 8 and is conveyed on the conveyance guide plate 8 while rotating the rotary roller 9.

As mentioned above, since the paper 3 after peeling is transported along the transport guide plate 8 while rotating the rotary rollers 9, there is no rubbing between the paper 3 and the transport guide plate 8, and the paper 3 is not rubbed. Triboelectric charging at the location is prevented. Furthermore, there is no friction between the rotating rollers 9 and the conveyance guide plate 8, and almost no frictional charge is generated on the rotating rollers 9.

Therefore, the cause of electrostatic scattering of the transferred toner on the paper 3 is eliminated, and the paper 3 is transported along the transport guide plate 8.

According to this embodiment, one side edge of the paper 3 is held between the separation belt 5 and the separation row 27 to separate the paper, and the paper 3 on the opposite side is separated by using the stiffness of the paper itself. We are using. Therefore, a difference may occur between the speed at which the paper is transported by the separation belt 5 and the separation roller 7 and the speed at which the paper is transported along the transport guide plate 8 on the opposite side.

In particular, in the conventional type, the speed tends to be low because the paper is brought into close contact with the transport guide plate 8 and is transported by friction.

This causes skewed feeding and paper jams.

However, by providing the rotating rollers 9 on the conveyance guide plate 8, there are no factors that inhibit the conveyance of the paper, and it is possible to prevent skew feeding, jamming, etc. at the same time.

<Effects> According to the conveying device of the present invention, since frictional charging between the paper and the guide plate that guides and conveys the paper after peeling is eliminated, the toner on the paper is kept in a stable state without scattering. Transport can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a copying machine equipped with a conveying device according to the present invention, FIG. 2 is a perspective view showing the main parts of the conveying device of the present invention, and FIG. 3 is a side view showing a conventional example of the conveying device. FIG. 4 is a schematic diagram for explaining the state of toner scattering. Photoconductor 2: Guide plate 3; Paper 4: Transfer corona discharger 5: Separation belt 7: Separation roller 8: Conveyance guide plate 9: Rotating roller Agent Patent attorney Takeshi Sugiyama (and 1 other person) Figure 1

Claims (1)

[Claims] 1. An image formed on a recording medium is electrostatically transferred to a transfer material, the transfer material is peeled off from the recording medium, and the peeled transfer material is conveyed along a conveyance guide plate. What is claimed is: 1. A release paper conveyance device, characterized in that a rotary body that rotates according to the movement of the transfer material is provided in the vicinity of the conveyance guide plate where the peeled paper comes into contact with the conveyance guide plate.