JP2598759Y2 - Transfer paper static eliminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transfer paper static eliminator in a transfer paper transport path of an electrophotographic apparatus.

[Conventional technology]

FIG. 4 is a schematic structural view of an electrophotographic apparatus to which the present invention is applied, wherein 1, 2 and 3 are paper feed trays, 4 is a document tray, 5 is an automatic document feeder, 6 is a contact glass, and 7 is illumination. The lamp 8 is an imaging lens. Reference numeral 9 denotes a belt-shaped photosensitive member, around which a charging charger 10, an exposure unit 11, a surface voltmeter 12, an eraser 13, filming removing means 14, a developing device 15, a transfer / separation charger are arranged in the order of the image forming process.
16, a cleaning device 17 is provided. Reference numeral 18 denotes a fixing device, 19 denotes a paper discharge tray, and 20 denotes a double-sided tray.

In such an apparatus, the transfer paper fed from any of the paper feed trays 1, 2, and 3 is transferred / transferred by a paper feed roller group.
It is transported to the separation charger 16 position.

On the other hand, an original (not shown) on the contact glass 6 is illuminated by the illumination lamp 7, and the reflected light is imaged by the imaging lens 8. Then, an electrostatic latent image is formed on the photoconductor 9 by the exposure unit 11, and the toner image visualized by the developing device 15 is transferred to a transfer sheet at a transfer / separation position. The transfer paper then passes through a fixing device 18 and is discharged onto a discharge tray 19.

FIG. 5 is a front view of a sorter B connected to the electrophotographic apparatus A. The transfer paper sent from the electrophotographic apparatus A passes through a horizontal transport path 21 and a vertical transport path 22 of the sorter B, and is transferred to a plurality of stages. Each of the bins 23 is arranged so as to be sorted.

FIG. 6 is an enlarged front view of the sorter of the sorter.
Reference numeral 5 denotes a transport roller, and reference numeral 26 denotes a deflection claw. The transfer paper transported in the vertical transport path 22 is deflected by about 90 degrees by the deflection claw 26,
It is led to 23.

By the way, in such an electrophotographic apparatus, the charging of the transfer paper during the transfer of the transfer paper causes a paper jam, non-feed, and the like, which is a problem in use.

For this reason, conventionally, it has been common practice to dispose a conductive neutralizing brush (self-discharge type neutralizing means) in a transfer paper transport path, and slide the neutralizing brush and the transfer paper to eliminate static.

For example, in FIG. 6, static elimination brushes 27 are provided at the entrances of the bins 23, respectively, and slidably contact the back surface of the transfer paper discharged to the bin 23, thereby performing the static elimination of the transfer paper.

[Problems to be solved by the invention]

However, even if a charge removal brush is provided, it may not be possible to completely remove the charge, such as when the amount of charge on the transfer paper is large, and the mounting position and method also rely solely on the intuition and experience of the designer. Some of them lack reliability.

The present invention has been made in view of the above-described circumstances of the related art, and an object of the present invention is to provide a transfer paper static eliminator having excellent static elimination performance at low cost.

[Means for solving the problem]

In order to achieve the above object, the present invention disposes a conductive neutralizing brush in a transfer paper transport path,
In a transfer paper static eliminator provided with an insulating member at a position substantially opposite to the bristle tip in a direction in which the brush tip extends in a direction in which the brush tip extends, the neutralization brush is provided at a base of a bottle. It is externally attached along an end face, and the insulating member is provided adjacent to a lower end of the static elimination brush.

[Action]

According to the configuration, the opposing member is grounded by providing the insulating member via the transfer paper conveyance path at a position substantially on the extension of the bristle tip of the neutralizing brush in the extension direction and facing the bristle tip. The charge amount of the transfer paper can be greatly reduced as compared with the case where the conductive member is used. At that time, the static elimination brush need only be externally attached along the end face of the base of the bottle, and the insulating member need only be provided adjacent to the lower end of the static elimination brush. And assembly is easy.

〔Example〕

The present inventor has found that the static elimination performance of the static elimination brush greatly differs depending on the material of the peripheral member, particularly the member at the position opposite to the brush tip.

Similarly, it has been found that the charge elimination performance of the charge elimination brush differs greatly depending on the distance between the member facing the charge elimination brush and the tip of the charge elimination brush. When the distance between the tip of the neutralizing brush and the opposing member is equal to or more than a predetermined value, the amount of charge of the transfer paper is significantly reduced as compared with the case where the distance is less than the predetermined value.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to portions which are the same as or can be regarded as the same as those in the conventional example, and duplicate description will be omitted.

FIG. 1 is a front view of the transfer paper static eliminator according to the first embodiment, and shows the vicinity of a sorting portion of a sorter corresponding to FIG.

In the present embodiment, the static elimination brush attached to the base of the bottle 23
An insulating member 28 is attached to a portion facing the front end of 27, specifically, to the lower end of the base of the upper bin 23. Here, as shown in FIG. 1, the mounting position of the insulating member 28 is at the base end of the neutralization brush 27 of the upper bin 23 provided substantially on the extension of the tip of the neutralization brush 27 in the extension direction. It is with.

With such a configuration, as is apparent from the comparison characteristic diagram of FIG. 2, the charge amount of the transfer paper after passing through the neutralizing brush 27 is reduced by 60 times compared to the case where the opposing member is a grounded conductive member.
%.

 Next, a second embodiment will be described with reference to FIG.

FIG. 3 is an enlarged front view of the vicinity of the transfer sheet discharge portion. The charge removing brush 27 for removing charges on the double-sided transfer paper is provided on the upper surface of the entrance portion of the double-sided tray 20 in order to select a place where the distance to the opposing member is large. The brush is provided with the brush tip facing downward. In this case, the distance from the bottom plate 20a, which is the opposing member, is set to be 10 mm or more, preferably 30 mm or more from the characteristic diagram of FIG.

With such a distance relationship, the static elimination ability can be improved.

It should be noted that the static eliminator in the first and second embodiments is not limited to the above description, and it is needless to say that the static eliminator can be set at an arbitrary position in the transfer paper transport path.

[Effect of the invention]

According to the present invention, it is only necessary to externally attach the neutralizing brush along the end face of the base of the bottle and to provide an insulating member at the lower end thereof. The transfer paper static eliminator capable of performing the operation can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a front view of a transfer paper static eliminator according to a first embodiment,
FIG. 2 is a comparative characteristic diagram, FIG. 3 is a front view of a transfer paper static eliminator according to a second embodiment, FIG. 4 is a schematic configuration diagram of an electrophotographic apparatus to which the present invention is applied, and FIG. Front view of the sorter,
FIG. 6 is an enlarged front view of a sorting section of a conventional sorter,
FIG. 7 is a characteristic diagram showing the relationship between the charge removal amount and the distance between the neutralizing brush and the opposing member. 20a: Bottom of double-sided tray, 27: Static elimination brush, 28 ...
Insulating member.

Claims (1)

(57) [Scope of request for utility model registration] An electric discharge brush having conductivity is disposed in a transfer paper transport path, and the transfer paper transport is located at a position substantially on the extension direction of the bristle tip of the neutralization brush and facing the bristle tip. In the transfer paper static eliminator provided with an insulating member via a path, the static elimination brush is externally attached along an end face of a base of the bottle, and the insulating member is provided adjacent to a lower end portion of the static elimination brush. A transfer paper static eliminator, characterized in that: