JPS62276568A - Destaticizing device - Google Patents

Abstract

PURPOSE:To reduce the cost and space of a destaticizing device, by commonly using the high-voltage power source for a electrifying corona discharger and for a transferring corona discharger. CONSTITUTION:After a belt-like photosensitive body 1 is uniformly electrified by a electrifying corona discharger 4, its section other than a picture are is destaticized by a erase section 5 and, thereafter, the picture area is destaticized by a destaticizing section 13 after passing through an exposure device 6, developing device 7, transferring corona discharger 9, corona discharger 10 for separation, and cleaning device 12. A high-voltage power source is commonly used for the corona dischargers 4 and 9 and connected with the dischargers 4 and 9. In addition, a light source is commonly used for the erase section 5 and destaticizing section 13. When the photosensitive body 1 is irradiated by rays of light from a lamp 14 through an optical path 16, the body 1 is destaticized over the entire surface and, when the body 1 is irradiated by the rays of light of the lamp 14 through another optical path 15 and liquid crystal 17, the section of the photosensitive body 1 except the picture area is destaticized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The invention relates to a copying apparatus having a corona discharger for printing and a corona discharger for transfer.

(Conventional technology) Charging using a conventional corona discharger for charging photoreceptors.

In a copying machine that repeatedly performs image exposure, development, and image transfer to transfer paper using a transfer corona discharger, the charging corona discharger and the transfer corona discharger are operated at different timings by separate corona dischargers. There is.

However, in this copying apparatus, the charging corona discharger and the transfer corona discharger are operated by separate high-voltage power supplies, resulting in high cost and requiring a large space.

(Objective) It is an object of the present invention to provide a copying apparatus that can improve the above-mentioned drawbacks and reduce cost and space.

(Structure) In the present invention, a high voltage power source is shared between a corona discharger for loading and a corona discharger for transfer.

Figure 3-1 shows an embodiment of the present invention.

The belt-shaped photoreceptor 1 is wrapped around a roller 2.3 and rotated by a driving mechanism, and is charged to one bed by a corona discharger 4Vc for a band T6 and then erased from an erase capital 5VC outside the drawing area (
After creating an image (area) or removing it, use the Fukko unit 6 to form an electrostatic submergence with 1 car area or Fukko unit. This first success is achieved by the development device 7, which transfers the image from the transfer corona discharger 9Vc to the transfer paper fed from the paper feeder via the registration roller 8.
The transfer paper is separated by the separating corona discharger 10. This transfer paper is conveyed by a bell) 11Vc, the image is fixed by a fixing device, and is discharged as an external VC copy. Further, the photoreceptor 1 is cleaned by a cleaning device 1 after the equinox of the transfer paper.
2Vc, the static electricity is removed by the static eliminator 13Vc, and the above operations are continuously repeated for the set number of copies, thereby obtaining the set number of copies.

Here, the erase section 5 is used to remove static electricity from areas outside the image area on the photoreceptor 1 to prevent unnecessary development. Further, the exposure of the original image causes a potential difference between the bright and dark areas of the photoreceptor 1, and thereafter the photoreceptor 1 is uniformly discharged, but the surface potential is made uniform by the charge removal unit 13VC and the process proceeds to the charging step of the missing copy cycle.

In the dark area on the photoreceptor 1, a corona discharger 4 is activated during the charging process.
As shown in Figure 4, the potential charged by the photoconductor is further increased by the corona discharger 9 in the transfer process, making it impossible to perform a one-time charge in the charging process of the next copy cycle. 1 static electricity removal is required.

The high-voltage power supplies of the corona dischargers 4 and 9 are shared, and one high-voltage power supply is connected to the corona discharger 4.9, and the erase unit 5
As shown in Figure 2, the static eliminator 16 and the static eliminator 16 share a light source. That is, an optical path 15. 16 is formed, and a liquid crystal 17 is provided in the optical path 15. The photoreceptor 1 is completely neutralized by being irradiated with light from the lamp 14 through the optical path 16, and the light from the lamp 14 is transmitted through the optical path 15. Static electricity is removed by irradiating the light through the liquid crystal 17. The liquid crystal 17 has a plurality of parts as shown in Figure 6.
! ! I liquid crystals 171 to 17n are arranged perpendicularly to the direction of rotation of the photoconductor 1 (in the 1st direction of the photoconductor 1), and a VC is provided between the Nesa glasses 27 and 28 as shown in Figure 5. Ki force photoconductor 10 to improve erase accuracy.
It is placed nearby, for example, within 61 points from the surface of the photoreceptor 1. The plurality of liquid crystals 171 to 17n are energized from the power source 1B through the switches 19 to 21 to transmit light outside the image area on the photoreceptor 1 (area displaced from the transfer paper), and Eliminates static electricity outside the image area.Paper size detection means 22
is provided in the paper feeding device and detects the size of the transfer paper. The print switch 23 is an operation switch that starts the copying operation, and when the print switch 25 is turned on, the switch 24 is turned on and the microcomputer 25 starts the timer 2.
6 and turn switches 19 to 21 to 1ljll H
do. In this case, the microcomputer 25 selects an area V on the photoreceptor 1 that is removed from the transfer paper on both sides 1iIjl.
C. A switch for transmitting light through the opposing liquid crystals and completely transmitting light through the liquid crystals 171 to 17n in an area that is removed from the transfer paper on the photoconductor 1 in the front-rear direction, thereby removing static from outside the area of the number of strokes on the photoconductor 1. 19 to 21 are controlled.

Figure 6 and Figure 7 show other embodiments of the present invention.

In this embodiment, the liquid crystal 17 in the above embodiment VC is omitted and a shielding plate 29 is provided. This shielding plate 29 shields the optical path 15 and opens the optical path 16 as shown in FIG. The photoreceptor 1 is neutralized and the surface position of the photoreceptor 10 is made the same in each cycle. When the photoreceptor 1 does not need to be charged (when the light source of the exposure device starts up).

When the optical system moves back, etc.), the VC is as shown in Figure 8 (b, IK), the shielding plate 29 shields the optical path 16 and opens the optical path 15, and the photoreceptor 1 is neutralized by the light from the lamp 14 in the erase section 5. Figure 3-9 shows the surface potential of the photoluminescent material 1 at 8vc when charging is required (a) and when charging is not required (b). An example timing chart is shown. Figure 3-11 shows the shielding plate 29>
% Shows the mechanism that moves. This structure consists of a spring 60 and a lens 61. When the lens 61 is turned on, the shielding plate 29 is rotated to a position where it blocks the optical path 16 from the lens 31Vc, and the lens 61 is turned off. At times, the shielding plate 29 returns to the position where it shields the optical path 15y by the spring 30.

FIG. 212 shows an optical system and a static eliminator in another embodiment of the present invention.

The image of the original document 32 is formed on the surface of the photoreceptor 1 through a lens 63. In the same magnification mode, an image is formed between the edges X and Y of the original 62 between O and A on the photoreceptor 1. In the reduction magnification mode, the lens 66 moves from the position 33a to the line connecting X and ○, and moves to the position 33b, for example, so that the connection between imaged. At this time, light does not reach between A and B of the photoreceptor 1, so if the charge is not removed, it will be developed (a black band will appear), increasing the load on the cleaning device and causing problems such as black bands appearing on the copy. The problem can be solved by a method of restricting the band tail region on the photoreceptor 1 to the I4 region or a method of eliminating static electricity from the photoreceptor 1. In the latter method, a 5IIc static elimination lamp 64 as shown in FIG. , a casing 65 surrounding it, and a removal rung 34a,
54b.

A method has been considered in which a cutting member 56 for cutting 34c is provided and the light emission of the static elimination lamps 34a + 64b + 64c is controlled according to the reduction magnification. In this method, the photoreceptor 1
When static electricity is removed from the front and rear sides of the upper document image projection area, the static electricity removal lamps 34a, 34b, and 34° all light up, and when the reduction mode is selected and the lens 66 is at the 33b position, the static electricity removal lamp 34a lights up. Then, charge is removed from the portion of the photoreceptor 1 on the side of the original image projection portion. However, when the copying magnification is varied steplessly, the charge-eliminating area of the photoreceptor 1 is restricted by the partition member 36, so it is necessary to narrow the interval between the partition members 660 in order to prevent the black bands and image breakage. ,
There is a limit to this depending on the size of the static elimination lamp 64, etc.

In this embodiment, as shown in Figure 3-14, the Vc static elimination lamp 3
4d and 34e, a casing 65 surrounding them, and a liquid crystal shutter device 67 for regulating the static elimination area. When the lens 66 is at the position 33b, the operating range on the photoconductor 1 is between 0 and B, and the control means operates the static elimination lamp 34e' to eliminate static between A and B on the photoconductor 1.
1, turn on the liquid crystal of the liquid crystal display device 37 -m 3
By applying a voltage to 8a by a control means, the liquid crystal 37
A acts as a shutter and does not allow light to pass between B and C on the photoreceptor 1. Since no electric field is applied to the other portion 68b of the liquid crystal, light passes through it, and the charge between A and B of the photoreceptor 1 is removed. In this way, by controlling the width of the electrode that applies voltage to the liquid crystal 58 according to the magnification ratio and the document size using the control means, the charge-eliminating area of the photoreceptor 1 can be changed steplessly in the direction of interest.

When static electricity is to be removed from a portion of the photoreceptor 1 that is shifted forward or backward from the exposed portion of the original image, the control means is a static electricity removal/pro 4e.

34d is turned on, and no voltage is applied to the liquid crystal 38vC.

The liquid crystal shutter device 67 is composed of polarizing plates 39, 40, liquid crystal 68, glass plates 41, 42, transparent electrodes 43, 44, and intervening films 45, 46 as shown in Fig. It has texture properties as shown in a) VC, and when voltage is applied, the texture is lost as shown in Figure 16 (b) Vc. The polarizing plates 39 and 40 are diagonal at 90° and do not allow light to pass through when a voltage is applied. Note that 47 in the figure is a liquid crystal molecule.

(Effects) As described above, according to the present invention, the high-voltage power source is shared between the charging corona discharger and the transfer corona discharger, so it is possible to reduce costs and space.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram illustrating an embodiment of the present invention, Figure 2 is a diagram of spear 1.
A partially enlarged view of the figure, Figure 6 is a perspective view showing the liquid crystal of the first embodiment, Figure 4 is a diagram showing the surface potential of the photoreceptor in each step of the same embodiment, and Figure 5 is a control means for the liquid crystal. Diagram showing fang 6
The figure is a schematic diagram showing another embodiment of the present invention, Figure 7 is a partially enlarged view of Figure 6, Figure 8 (a) and (b) are diagrams showing the switching operation of the shielding plate of the same embodiment, Figures 3-9 are diagrams showing the surface potential of the photosensitive book in each step of the same example, Figure 10 is a timing chart of the same example, Figures 3 and 11 are perspective views showing the moving part of the shield plate of the same example, Fig. 12 is a schematic diagram showing an optical system and a static eliminator in another embodiment of the present invention, Fig. 716 is a perspective view showing an example of the static eliminator, Fig. 14 is a partially enlarged view of Fig. 3-12, and fang 15 The figure shows the configuration of the liquid crystal/yanotar device, and Figure 16 shows the operation of the liquid crystal shutter device. 4...Corona discharger for charging, 9...Corona f discharger for transfer. No. 2 (Kun 2nd vote Kaya 3rd doctor Ox (2) 5th Tomoe + 2) S 6th area T figure 80 (a) % ? Figure t (a) 12th, 13th name, 1 + Tomoe, Figure 15, Da σ Figure 16 (a) (b)

Claims (1)

[Claims] In a copying apparatus that repeatedly performs charging using a corona discharger for charging a photoreceptor, image exposure, development, image transfer to a transfer material using a transfer corona discharger, cleaning, and neutralization, the above-mentioned corona discharger for charging and the above-mentioned transfer corona discharger are used. A copying machine characterized by sharing a high-voltage power source for a corona discharger.