JPS6215796A - Sheet material guide unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Scope of Industrial Application] The present invention relates to a sheet material guiding device, specifically, for guiding the conveyance of a transfer material, etc. in a copying device, printer, or microfilm printing device using an electrophotographic method, for example. The present invention relates to a sheet material guiding device.

The following will explain the sheet material guiding device of a copying machine as an example, but it goes without saying that the present invention is not limited to this example.For example, the sheet material is not limited to a transfer material, and It can also be applied to things that simply cause lateral displacement without being affected. The material of the sheet material is not limited to paper, and it is also applicable to materials such as films.

[Conventional technology]

Traditionally, this type of device is made of metal or Noryl.

Resins such as ABS and metals coated with teff shellfish have been used.

In order to convey a thin sheet such as paper smoothly without disturbing the image, it is necessary to make the surface of the member that conveys the sheet smooth and to take measures against static electricity. Since the former is self-evident, the latter will be explained here.

Generally, a sheet is charged to several hundred to several thousand volts due to frictional charging or transfer corona discharge, and on the other hand, a sheet conveying member is also charged to several hundred to several thousand volts due to frictional charging with the sheet. If the polarities of the electric charges charged on the sheet and the sheet conveying member are different from each other, the electric charges will be discharged from each other, and the unfixed toner image on the sheet will be disturbed by the energy generated during this discharge. This is because even if the charges on the sheet and the sheet conveyance member are the same, when this charged potential reaches several thousand volts, discharge occurs with toner particles of different charge polarity and surrounding members, causing disturbances in the toner image. It turns out. This phenomenon is particularly likely to occur at low humidity, and the higher the resistance of the sheet member is, the more likely it is to occur.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and an object of the present invention is to provide a sheet material guiding device that prevents the sheet material from being adversely affected by charging.

[Means for solving problems]

In order to achieve the above object, the sheet material guiding device according to the present invention is characterized in that a coating of ultraviolet curable resin containing conductive particles is formed on the surface.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

FIG. 1 is a sectional view of an embodiment for explaining the image recording method of the present invention, and IL is a computer.

This is a semiconductor laser that blinks and is modulated in response to recorded image information signals from word processors, facsimile transmitters, etc. The laser beam 2 oscillated by the semiconductor laser IL is incident on a polygon mirror IS that is rotationally driven by a Chiyoda ID, and is deflected and scanned by the rotation of this polygon mirror IS. After passing through an imaging lens IF such as a well-known f-theta lens, this laser beam 2 is reflected by a mirror LM, and is imaged into a spot on a photosensitive drum 3 for electrophotography rotating in the direction of the arrow. The drum 3 is repeatedly scanned in a direction substantially perpendicular to its rotational direction.

Semiconductor laser IL usually has an oscillation wavelength of 770 to 800n.
On the other hand, the photoreceptor provided on the circumferential surface of the photosensitive drum 3 may be a photoreceptor sensitive to this wavelength, such as a metal phthalocyanine-based organic photoconductor, a selenium-based photoconductor, or an amorphous silicon photoconductor. is used.

Reference numeral 4 designates a charger of negative polarity, which uniformly charges the photosensitive drum 3 coated with an organic photoconductor or the like. In order to stabilize the potential, a grid 17 is provided between the corona discharge electrode of the charger 4 and the photosensitive drum 3 at a constant distance from the photosensitive drum 3. This grid 17 is connected to an electrically installed voltage generating member (not shown), and when a corona discharge current flows, a constant voltage is applied to the grid 17, and when it is applied to the photosensitive drum 3, the corona discharge flow rate is is configured to control the surface potential v1 of the photosensitive drum 3. The photosensitive drum 3 charged by the charger 4 is scanned by the laser beam 2 modulated in accordance with the above-mentioned recorded image information signal.
An electrostatic latent image is formed. This embodiment uses a so-called image scanning method in which a portion to which toner is to be attached, that is, a portion to be visualized, is irradiated with a laser beam. This is because the image scan method provides clearer image quality than the background scan method, requires less laser emission time, and is advantageous for the lifespan of semiconductor lasers.

This electrostatic latent image is visualized by the next developing device 5 using toner of negative polarity.

On the other hand, the sheet P on the stacking table S is fed onto the photosensitive drum 3 by a feeding roller 6 and a registration roller 7 that rotates in synchronization with the image on the photosensitive drum 3. Then, the toner image on the photosensitive drum 3 is transferred onto the sheet P by the positive transfer charger 8.

After that, the sheet P separated from the photosensitive drum 3 by the separating means 9a is guided to the fixing device 10 by the guide 9, and after the toner image on the sheet P is fixed, the sheet P is discharged onto the tray 12 by the discharge roller 11. .

On the other hand, after the transfer, the toner remaining on the surface of the photosensitive drum 3 is removed by a cleaning device 13, and then the pre-exposure light source 1
6, uniform exposure is achieved. By being exposed to light by the light source 16, the photosensitive drum 3 is neutralized and the occurrence of a ghost phenomenon is prevented.

As the light source 16, a halogen lamp, an incandescent bulb, a light emitting diode (LED), or the like is used. In order to uniformly guide the light from the light source 16 to the photosensitive drum 3, an optical fiber or a cylindrical lens may be used.Even if the deviation is I, charged by.

FIG. 2 is a perspective view of the conveyance guide 9 shown in FIG. 1.

After the sheet is separated from the drum by a separation belt,
It contacts the curved surface 21 and is then conveyed along the ribs 22. The gap 23 of this conveyance guide is configured so that the static eliminating needle can be placed so as not to come out onto the surface.

There is a metal 24 installed between the ribs so that it does not become a sheet, and it electrostatically attracts the sheet to the rib 2.
0, which is configured such that the sheet is conveyed along
The curved surface 21 and ribs 22 are made of ABS with smooth surfaces.
It is made from a resin mold.

According to the present invention, the surface of the conveyance guide 9 in the above-mentioned apparatus is coated with an ultraviolet curing resin in which conductive particles are dispersed.

Therefore, even if a frictional charge is generated due to friction with the sheet, this coating is electrically conductive, so it easily flows laterally, and the entire transport guide is uniformly charged without accumulating on a part of the transport guide, so the potential is There are no abruptly changing parts, and no image disturbance occurs even when the sheet material carrying an unfixed toner image is conveyed.

This means that with conventional ABS conveyor guides, the surface is several hundred to
It was charged to several thousand ports, and its distribution was uneven,
By using the conveyance guide according to the present invention and by lifting this conductive film from the ground, the surface potential can be reduced to about 20
At the same time as the voltage dropped to about 0 volts, the uneven charging on the surface disappeared.

The resistance of the film to express the above effect is 10 in terms of volume resistance.
It is sufficient if it is lower than the −8ΩC layer.

In the above example, the film was electrically disconnected from the ground, but a bias voltage may be actively applied. In this case, a high voltage power supply or a voltage generating element such as a varistor may be used.

As an example, an acrylic ultraviolet curable resin (Dainichisei Kakogyo Co., Ltd., Seiriki Beam PH
C-2210) and 20% by weight of copper particles (particle size 0.1-1
Disperse 0g, m) and apply by spraying, approximately 15gm
When this film was formed, no disturbance of the toner image occurred and good conveyance properties were obtained. Here, if the film thickness is 254 m or more, the problem of insufficient ultraviolet light transmission and insufficient hardness tends to occur.

On the other hand, if the film thickness is less than 5 pm, the coating may wear away after long-term use, causing the surface to show and the performance to deteriorate.

Therefore, the film thickness is preferably 6 to 25 JLm.

In addition, if the weight ratio of the copper resin powder is less than 5%, the effect of dispersing copper cannot be obtained, and if it is more than 40%, secondary particles will be formed on the Teflon, making the surface rough and reducing the conveying performance. This is not preferable because the strength of the ultraviolet curable resin decreases.

Therefore, the weight ratio is preferably 5 to 40%.

Furthermore, the particle size of the copper resin powder used is O01~10I
Lm is preferred; this is a necessary condition for uniform dispersion in a film thickness of 5 to 25 gm.

In fact, in order to check the wear, we used a taper tester made by Yasuda Seiki Seisakusho to perform a rubbing test against paper under a load of 250g, and there was almost no wear no matter how much we rubbed for 10 hours. However, when ABS resin was used alone, a gap of several 4 meters or more occurred. It is clear that the wear resistance will continue to improve and the lifespan will be extended.

The above specific numerical values are just examples and are not limited thereto, and the numerical values listed as unfavorable examples are not unusable depending on the usage conditions, etc., but are only inferior to preferred examples.

The above is a description of one embodiment of the sheet guiding device according to the present invention, but it goes without saying that the present invention is not limited to this embodiment.

For example, in the above embodiment, urethane acrylate resin (Seiriki Beam) was used, but other resins, such as urethane acrylate resin (manufactured by Kansai Paint, trade name Sonne C), may also be used.
K-8) to which 5 wt % of benzoin ethyl ether is added as a polymerization initiator, and further 10 wt % of a surfactant (manufactured by Sumitomo 3M, trade name Florard FC-431) and zw % of carbon may be added.

Moreover, although the guide used for conveyance after transfer has been described in the present invention, other guide members such as conveyance members may be coated according to the present invention.

Generally, conveyance guides for such sheets have complex shapes and are made by molding, so the surface is soft and easily abraded due to friction with the paper.
Acrylate has the advantage of high hardness and resistance to wear.

In addition, the ultraviolet curing resin has high hardness and excellent wear resistance, and can prevent the guide that rubs against the sheet from slipping.

Furthermore, a Teflon resin coating can be formed even on heat-sensitive resins such as ABS, and an inexpensive and durable conveyance guide can be created.

It can also be applied to metals and is cured by ultraviolet light, so it has the advantage of drying and curing in a short time.

In particular, forming a film on a mold as in the present invention is advantageous because it does not have the following drawbacks.

(1) In order to make the conveyance guide conductive, it is disadvantageous to put conductive particles into the mold because it increases the cost. This is because it is necessary to add about 10 to 30 wt% of conductive particles.

(2) Furthermore, dispersing such particles makes the mold brittle, which is disadvantageous when a conveyance guide is used as a structural material.

As explained above, by providing a coating of ultraviolet curing resin in which conductive particles are dispersed on the surface of the transfer material conveying member that rubs against the transfer material, the frictional charge flows in the horizontal direction and the entire surface is uniformly charged. . Moreover, it has become possible to create a durable conveyance guide that prevents charging to a high potential and has good conveyance properties. In other words, the surface potential decreases,
This is because it is evenly and uniformly charged.

〔Effect of the invention〕

Since the sheet material guiding device according to the present invention is as described above, it has the effect of preventing adverse effects on the sheet material due to charging.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an electrophotographic apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a conveyance guide, and FIG. 3 is a longitudinal cross-section of a conveyance guide surface layer according to an embodiment of the present invention. It is an enlarged view of the figure. 3 is a photosensitive drum, 9 is a guide, 20 is a coating, 25 is a conductive particle, and 26 is an ultraviolet curing resin.

Claims (5)

[Claims] (1) A sheet material guiding device in which a sheet material moves while sliding on a surface, characterized in that a coating of an ultraviolet curable resin containing conductive particles is formed on the surface. (2) The sheet material guiding device according to claim (1), wherein the coating containing conductive particles is electrically grounded. (3) A voltage generating member is electrically connected to the coating containing conductive particles, and a bias voltage can be applied to the coating, as set forth in claim (1). sheet material guiding device. (4) The sheet material guide according to any one of claims (1) to (3), wherein the conductive particles are metal such as copper, silver, nickel, brass, aluminum, etc. Device. (5) A sheet material guiding device according to any one of claims (1) to (3), characterized in that the conductive particles are carbon.