JPS6156373A - Developing device of copying machine - Google Patents

Abstract

PURPOSE:To prevent a trimmer jam caused by a foreign matter generated or mixed in a device by providing a wire bar rotating in the same direction as a developing roll, in the vicinity of the developing roll, in a developing device for using a one component developer. CONSTITUTION:A wire bar 9 rotating in the same direction as a developing roll 3 is provided in the vicinity of the roll 3, in about the center part of a developing device 2. Accordingly, the roll 3 and the wire bar 9 rotate in the direction opposite to each other in the proximity point. The wire bar 9 consists of a structure formed by winding spirally a wire 11 to a round bar 10, and a big particle, dust or a paper powder, etc. are removed. Also, an auxiliary trimming bar 12 is provided vertically on the upper side of the wire bar 9, so that the big particle, dust, etc. carried by the wire bar 9 can be removed. Accordingly, in a developing device for using a one component developer, a timmer jam caued by foreign matters such as the big particle, dust or the paper powder, generated or mixed in the device is prevented, and even when the device remains unused and are used for a long period the deterioration of a picture quality such as a void, is not generated on a copying paper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a developing device such as a copying machine that uses a one-component developer in a copying machine, and more specifically, to a developing device such as a copying machine that uses a one-component developer.
1 to 1 (yI.

[Conventional technology]

Conventionally, developing devices using a one-component developer have mainly been equipped with regulation of the amount of developer on the circumferential surface of a developing roller. That is, a developing device having a structure in which a trimming bar is disposed on the circumferential surface of a developing roll with a slight land space therebetween has become mainstream.

[Problem that the invention seeks to solve]

In the above conventional structure, the developer is new and current (
&! Is it ln inside and outside the plane? While I was in M, the copy image had good image quality with no unevenness or streaks. However, if the developer is used for a long period of time, coarse particles, dust, paper powder, etc. may get mixed into the developer.
It was easy to get stuck in the trimming section, causing white spots and uneven image density on the copy paper.

This phenomenon is likely to occur in a developing device that uses a single-component developer. Extremely small compared to gaps etc.
The trimmer is easily clogged?
] No.5 and 1b le.

The present invention is to prevent trimmer clogging due to coarse particles, dust, paper dust, etc. that occur or mix in the developing device by using chemicals. The object of the present invention is to provide a developing device that does not cause deterioration of image quality such as white spots on copy paper by 1G even when left unused and used for a long period of time.

[Means and effects for solving the problems] The present invention provides a one-component developer (developing device that uses chemicals) equipped with a main trimming device that regulates the amount of developer on the developing roll, and a developing device that is located close to the developing roll. A wire bar is provided which rotates in the same direction as the roll, and an auxiliary trimming device is provided close to the wire bar to trim the peripheral surface of the wire bar and remove foreign matter. This prevents the trimmer from clogging due to foreign matter entering the printer, and prevents image quality deterioration such as white spots on copy paper even if left unused and used for a long period of time.

〔Example〕
1 Below, the present invention will be explained based on embodiments shown in the drawings.

In FIG. 1, (1) is a photosensitive drum, and a developing device (2) is disposed adjacent to this photosensitive drum il+. A developing roll (3) is disposed in close proximity to the photosensitive drum +11, and the photosensitive drum +11, which has been charged and exposed to form an electrostatic latent image, comes into contact with the toner between it and the developing roll (3), and the toner is removed. A toner image ta+ is formed on the peripheral surface. The developing device (2) has an exterior formed by a housing (4), a toner cartridge (5) in the upper part, and the above-mentioned developing roll (2) in the lower part.
3) is installed. Furthermore, a main trimming bar (6) is suspended from the housing (4) above the developing roll (3), and the tip of the main trimming bar (6) and the developing roll (
3) constitutes the main trimmer trimming gap (A). In a portion where the housing (4) surrounds the developing roll (3) and is close to the photosensitive drum [11], a sealing material (7) for preventing toner from being ejected to the outside of the developing device (2) and a magnetic rubber-packed sealing material ( 8) is installed.

Further, a developing roll (3) is located approximately in the center of the developing device (2).
) is provided with a wire bar (9) that rotates in the same direction as the developing roll (3). Therefore, the developing roll (3) and the wire bar (9) rotate in opposite directions at the near tν point. The wire bar (9) is a round bar QIll
The main purpose is to remove coarse particles, dust, paper powder, etc., and a wire bar (9) is attached to the upper side of the wire bar (9). An auxiliary trimming bar (
The tip of the auxiliary trimming bar (12) and the wire bar (9) constitute an auxiliary trimmer trimming gap (B). One wire line of this wire bar (9) and the above-mentioned auxiliary trimmer trimming gap (B
) and wire heart trimming gap CC) serve as gear knobs that block foreign matter and allow toner to pass through.

Furthermore, the wire diameter is determined by the main trimmer trimming gap (
A) is set to the optimum trimming gap to obtain the optimum toner layer thickness, and can prevent toner from being conveyed to the edge of the wire bar when removing foreign matter with the wire bar (9) ↓J'At It is ¥.

In the figure, (13) is an agitator that passes through 15 toners. Further, a toner supply port (5a) is provided in the toner cartridge (5).

The wire (11) is a non-magnetic material, but the round bar QO+ can also be a magnetic material.

FIGS. 2 and 3 show a cross-sectional side view and a perspective view of the wire bar (9).

The wire bar (9) has a structure in which a wire (11) is tightly wound in a spiral around a round bar 11101.

FIG. 4 shows the positional relationship between the developing roll (3) and the wire bar (9). Further, FIG. 5 shows a wire bar trimming gap (C) formed by the developing roll (3) and the wire bar (9).

Figure 6 shows the developing roll (3), wire bar (9), main trimming bar (6), and auxiliary trimming bar (12).
The flow of toner formed by

Only the necessary amount of toner on the developing roll (3) is consumed for development on the photosensitive drum +11, and the rest rotates on the developing roll (3) (arrow (D)).

Next, the present invention will be explained in detail.

The amount of toner on the circumferential surface of the developing roll (3), which converts the 11jp electrons formed on the circumferential surface of the photosensitive drum (1) into a replacement image, is determined by determining the developing speed, developing nip width, etc.', J'J+, B L
The optimum value is mainly determined by the magnetic pattern of the main trimming bar (6) and developer roll (3), or the amount of toner in the toner during long-term use after fresh toner supply. Coarse particles are generated, and foreign substances such as paper powder and dust are mixed in. In conventional developing devices, these foreign substances clog the trimming section, causing white spots on the copy paper and uneven copying.However, according to the present invention, its roll (3)
Due to the relationship between the rotational direction of the wire bar (9) and the direction of rotation of the wire bar (9), a vortex is generated at the position indicated by the symbol (X) in Fig. 6, and coarse particles and fibrous foreign matter are retained and captured in this part (X), and the main Conveyance to the trimming bar (6) is prevented. Furthermore, the auxiliary trimming bar (12) prevents foreign objects from being carried on the wire bar (9), and the main trimming bar (6)
Preventing the public from being sent to. Furthermore, the symbol (
The foreign matter caught in the areas indicated by X) and (Y) is subjected to the force of being conveyed to the edge of the wire bar (9) along the groove of the spiral wire (11), and is transferred to the developing device (2). carried to the side edge of the

At this time, if round bar a is made of magnetic material, wire (1
1) is non-magnetic, so the magnetic field and lines of magnetic force act effectively between it and the tip bar (101) to remove foreign matter on the developing roll (3), and furthermore, the toner formed on the circumferential surface of the wire bar (9) is It has been found that foreign matter can be removed efficiently by sweeping the spikes on the surface of the developing roll (3).

Note that foreign matter can also be removed by the main trimming bar (6) at the position indicated by the symbol (Z) in the figure.

The foreign matter removed from the developing roll (3) is carried along the groove of the spiral wire (11) to the edge of the wire bar (9), and is collected at the side end of the developing device (2). By providing a collection box, it is possible to prevent foreign matter from accumulating in the developing device (2).

At this time, to remove only the foreign matter, use the gear knob (A)
), (B), (C) balance and wire bar
This can be achieved by optimizing the wire diameter of +91.

In the experimental results, these relationships are as follows: When the main trimmer trimming gap (A) is 0.3 ± 0.2 mm, the auxiliary trimmer trimming gap (B) is 0.1 to 0.
3 mm is good, wire bar trimming gap (C
) was also 0.1 to 0.3 cranes. Also, the wire (1
The wire diameter of 1) was equal to and 5 times larger than the main trimmer trimming gap (A), that is, a wire diameter of 0.3 to 1.5φ was good.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

(1) Since foreign matter such as paper dust can be reliably removed by the toner swirl and the auxiliary trimming bar, trimmer clogging can be reliably prevented.

(ii) Since foreign matter can be collected from the developing device, maintenance such as cleaning is not required when replacing the developer.

(iii)) Since there are three rimming locations, the thickness of the toner layer can be reliably regulated.

(iv) The spirally wound wire of the wire bar evens out the toner on the image roll, improving the efficiency of foreign matter removal.

(v) The auger action of the spiral wire allows foreign matter to be conveyed toward the axial end and collected.

(vi) If the round bar is a magnetic material, the non-H1 of the wire
Coupled with this feature, foreign matter can be removed efficiently, and even after long-term use, there will be no deterioration in image quality such as white areas.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of an embodiment of the present invention, FIG. 2 is a cross-sectional side view of a wire bar, FIG. 3 is a perspective view thereof, FIG. 4 is an explanatory diagram of the positional relationship between the developing roll and the wire bar, and FIG. The figure is an explanatory diagram of the wire bar trimming gap, and FIG. 6 is an explanatory diagram of the flow of toner. +11・Photosensitive drum (2): Developing device (31:
Rllll Elephant 0-/Ll +41: How'; Nk+511-Nur Cart Renoji (5a): ) Gner Supply Port (6): Main Trimming Bar +71. +81: Knoll material (9): Wire bar 〇al: Nine bars (round bar)/wire (12): Nei1 support trimming bar (13):
Agitator ()~): Main trimmer trimming gap (B);? Ichisuke trimmer trimming gamble. (C); Wire bar trimming gap patent applicant
Fuji Xerox Co., Ltd. Tsuji ↑ Agent Masu Tebori (and 1 other person) v, Figure 1, 2rI! J Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A developing device using a one-component developer equipped with a main trimming device that regulates the amount of developer on the developing roll,
A developing device for a copying machine, comprising: a wire bar that is provided close to the developing roll and rotates in the same direction as the developing roll; and an auxiliary trimming device that trims the peripheral surface of the wire bar and removes foreign matter. 2. The wire bar consists of a round bar and a wire spirally wound around the round bar, and the wire diameter of the wire is the same as the main trimmer trimming gap between the main trimming device and the developing roll, or 5 times or less thereof. A developing device for a copying machine according to claim 1, wherein the developing device has a wire diameter of . 3. The developing device for a copying machine according to claim 2, wherein a wire bar trimming gap between the developing roll and the wire bar is 0.1 mm or more and not more than the main trimmer trimming gap. 4. Claim 1, wherein the auxiliary trimmer trimming gap between the auxiliary trimming device and the wire bar is 0.1 mm or more and not more than the main trimmer trimming gap.
Developing device for a copying machine as described in Section 1. 5. Development of a copying machine according to claim 1, wherein the wire bar comprises a round bar and a wire spirally wound around the round bar for collecting foreign matter by an auger action. Device. 6. The developing device for a copying machine according to claim 1, wherein the one-component developer is a magnetic one-component developer. 7. The developing device for a copying machine according to claim 6, wherein the wire bar has a round bar made of a magnetic material.