JPH06199010A - Charge eliminating brush for image forming apparatus - Google Patents

Abstract

PURPOSE:To obtain a good charge eliminating effect even in rough part and installation accuracy by directing the tip of a brush part from one end to the other of a surface from which electricity is to be removed to change in sequence the distance between the tip and the surface in a thing which slides on a surface to remove static electricity from it. CONSTITUTION:When a charge eliminating 1 is applied to a copying machine, a sublimation printer, and others in which a sheet after image recording is being discharged on a tray 5 through a paper feed/discharge roller 12 and a roller 26, the brush 1 is installed in a paper discharge opening 6 on the downstream side of the roller 26. The brush 1 is formed by cutting slantingly, viewed in the running direction of a recording sheet 2, a brush forming fibrous member so that its length becomes longer in sequence and so installed that the side having longer fibers is directed to the outlet side. In this way, irrespective of the dispersion etc., in the installation accuracy and location of the brush 1, an optimum distance between the brush tip and the recording sheet surface is arranged, enabling a good, constant charge eliminating.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static eliminator brush for eliminating static electricity generated on paper in a copying machine, a printer or the like at the time of feeding, recording or discharging.

[0002]

2. Description of the Related Art There are known copiers, printers, etc. that use static electricity positively, and even if they are not, paper that is frequently used as a recording material is used as an apparatus. In order to perform the paper feeding / discharging operation and the recording operation, the static electricity is inevitable.

FIG. 3 is a schematic side sectional view of a known sublimation printer, the construction and operation of which will be briefly described below.
Reference numeral 4 in the drawing denotes a paper feed tray in which the recording papers 2 are stacked, and at the time of paper feeding, the lever 7 is rotated around the support shaft 8 in the direction A by a drive source (not shown) to feed the paper. Face 9.

After that, the paper guide 10 also rotates in the direction D around the shaft 11 by a drive source (not shown), and the roller 14 attached to the paper guide 10 takes out one recording paper 2, It is sandwiched between the roller 14 and the paper supply / discharge roller 12. Since the paper feeding / discharging roller is rotating in the direction E, the sandwiched recording paper is conveyed in the direction B.

The recording paper which advances in the direction B and contacts the platen 15 advances along the circumferential direction thereof, and when the leading end of the recording paper reaches a predetermined position, the paper presser 16 is actuated. The leading end of the recording paper is fixed to the platen surface by the paper pressing unit 17 provided.

In this state, the platen 15 rotates in the direction F, and the recording paper whose front end is supported is supported by the platen and rotates.

When the recording paper reaches a predetermined position, the thermal head mounting plate 20 on which the thermal head 19 is mounted is moved to the pivot 2
The thermal head 19 is rotated around 1 to bring the thermal head 19 into contact with the platen 15. At this time, the thermal head 19
Presses the ink sheet 25 stretched between the supply core 24 and the take-up core 23 in the ink sheet cassette 22 against the recording paper on the platen 15.

Next, an image signal is sent to the thermal head 19 at a predetermined timing, and an image is recorded on the recording paper running on the platen 15. Needless to say, at this time, the ink sheet 25 runs in synchronization with the recording paper on the platen.

The ink sheet has cyan, yellow,
Magenta 3 color sublimation material is applied, platen 1
An image is formed on the recording paper with one color material per one rotation of 5, and the platen rotates three times to form the above three-color image on the recording paper. It is needless to say that the thermal head 19 retreats in order to avoid the paper pressing portion 17 every one rotation of the platen.

When the recording is completed, the platen 15 starts to rotate in the direction opposite to the F direction, and the trailing edge of the recording paper is placed in the paper guide 1.
After that, the recording paper advances from the rear end in the direction of the symbol N in the figure, and is discharged to the discharge tray 5 via the discharge port 6 by the supply / discharge rollers 12 and 26. By this time, the paper pressing plate 16 is operated and the leading edge of the recording paper supported by the paper pressing portion 17 is released.

A static elimination brush 1 is provided at the discharge port 6 to eliminate static electricity generated on the recording sheet due to frictional similarities in various parts of the apparatus.

FIG. 4 is an enlarged view showing the structure in the vicinity of the paper discharge port 6 of the above-mentioned apparatus, which includes a lung feeding roller 12 and a roller 26.
The recording paper 2 nipped and conveyed by is discharged by the brush portion 3 of the discharging brush 1 provided in the discharge port 6 and discharged to the discharge tray 5.

On the other hand, in the discharging means having such a structure, the discharging is insufficient if the distance l between the brush portion 3 and the recording paper 2 is too large, and even if the brush portion is brought into contact with the recording paper, the discharging is carried out. The effect is not improved, and in order to obtain a good static elimination effect, the mounting position accuracy of the static elimination brush 1 and the discharge tray 5
It is necessary to change the distance l by various factors such as the accuracy of the length of the brush portion 3 and the change of the surface condition of the recording paper. As a practical matter, it is difficult to always provide a stable and good static eliminating function. It was

The present invention has been made to cope with such a situation, and by properly forming the configuration of the brush portion of the static eliminator brush, strict component accuracy, mounting accuracy, etc. are not required, and it is always possible. It is an object of the present invention to provide a static eliminator capable of easily obtaining a good static erasing effect.

[0015]

[Constitution of the invention]

In order to achieve the above object, the present invention is a static eliminator for rubbing against a surface to be neutralized to eliminate static electricity from the surface to be neutralized. Is a charge eliminating brush of an image forming apparatus, in which the distance from the surface to be eliminated is sequentially changed from one end to the other end.

With this structure, the static eliminator brush can be easily mounted at a position where good static eliminator can be performed irrespective of the mounting precision of the static eliminator brush and variations in the brush foot. .

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS "FIG. 1" shows an embodiment of the present invention, and is a side view enlarging and showing only a portion in the vicinity of a paper discharge port of the apparatus shown in FIG. 4 "are denoted by the same reference numerals, and description thereof will be omitted unless necessary.

As shown in the figure, the brush portion 30 of the static elimination brush 1 arranged in the arrangement port 6 is such that the length of the fibrous member forming the brush becomes longer as viewed in the running direction of the recording paper 2. It is formed by cutting it diagonally. In addition, when attaching this to the paper discharge portion of the apparatus, as shown in the figure, the static elimination brush is attached so that the side with the longer bristles is on the outlet side.

By arranging the static elimination brush 1 in this way, the optimum distance l between the tip of the brush portion and the recording paper surface, which varies depending on the mounting precision of the static elimination brush of the apparatus, variations in the discharge position, and the like, is optimum. Exists. Therefore, good charge removal is performed by the brush portion of this optimum length, and in this case, the short bristle portion does not interfere with the static elimination, and the long bristle portion has a portion contacting the recording paper. However, since the brush portion is made of a flexible fibrous material, this does not hinder the discharge of paper.

FIG. 2 shows another embodiment, which shows only the static elimination brush, and it goes without saying that the brush portion 30 'faces the recording paper when it is attached to the discharge port of the printer. Nor.

As shown in the figure, in the brush portion of this static eliminator brush, the brush foot 31 'in the central portion is long when viewed in the recording paper advancing direction, and becomes shorter toward both upstream and downstream sides, and both upper and lower end portions 32' are formed. The shortest.

With such a structure, the two hairs of the brush portion, which have the optimum length, are obtained in the structure near the discharge port of the printer, the charge removing function is improved, and the hair is symmetrical. Therefore, it is easy to attach to the main body.

The embodiment in which the present invention is applied to a printer has been described above, but the present invention is not limited to such an apparatus, and can be applied to a well-known electrostatic copying machine and various printers. Can be easily understood.

As described above, according to the present invention, when setting the interval between the static elimination brush and the surface to be neutralized, which eliminates static electricity accumulated on the recording material due to the behavior during operation of the printer or the like, It eliminates the difficulty of adjustment due to mounting accuracy, variations in brush bristle length, variations in paper ejection position, etc., and it is possible to reliably perform good charge removal with a simple operation, which greatly contributes to cost reduction.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration near a paper discharge port of a printer showing an embodiment of the present invention.

FIG. 2 is a side view of a static elimination brush showing another embodiment.

FIG. 3 is a schematic side sectional view of a printer suitable for applying the present invention.

FIG. 4 is a side view showing a configuration in the vicinity of the paper ejection port as above.

[Explanation of symbols]

 1, 1'Electrification removing brush 2 Recording paper 3, 30, 30 'Brush section 4 Paper feed tray 5 Paper ejection tray 6 Paper ejection port 10, 13 Paper guide 12 Paper ejection roller 15 Platen 16 Paper retainer 19 Thermal head

Claims (2)

[Claims] 1. A static eliminator brush for rubbing static electricity on the surface to be neutralized by rubbing against the surface to be static neutralized, wherein the tip of the brush portion extends from one end to the other end. A static elimination brush for an image forming apparatus, which is formed so that the distance from the surface to be neutralized changes sequentially. 2. The static eliminator brush according to claim 1, wherein the tip of the brush portion is formed so as to have a shorter bristle from the center to both ends of the brush when viewed in the sliding direction with respect to the recording paper.