JPS60470A - Developing device of copying machine or the like - Google Patents

Abstract

PURPOSE:To remove a foreign matter of a trimmer gap part, a toner blocking of the lower part of this side of a trimmer, etc., by inserting a thin plate into a gap having the same width as the trimmer of this side of the trimmer. CONSTITUTION:Spacers 9, 10 are provided and fixed on both end parts of a housing 5 and a trimmer 6, a gap of an image width is provided, and usually an inverted L-shape plate body 11 is inserted. In case a fiber, etc. in a toner 14 are caught by a trimmer gap part and collect, or a toner blocking is generated in the lower part of this side of the trimmer and a copy defect occurs, the plate body 11 is drawn out and an inserting plate 13 which is prepared separately and provided with a magnetic material by the same shape is inserted. In this way, the foreign matter is removed, also the toner blocking is broken, the plate body 11 is attached again, and a copying operation is started.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a developing device such as a copying machine.

(Prior art) In contrast to a two-component development method that uses toner and carrier, when a developer is attached to an electrostatic latent image formed on the surface of a photoconductor to create a visible image, the toner and carrier each have their own functions. The one-component development method, which combines the two toners into one toner, allows the equipment to be built into a shed, and there is no need to adjust the toner density to adjust the development density.
This method has the advantage that the device can be manufactured at a low cost, and that stable copy image quality can always be obtained since the ν row does not occur while the developer deteriorates.

By the way, this -component development method uses a magnetic development method, so in order to optimize the image quality of the final copy, it is necessary to magnetically move the toner from the surface of the mag roll to the interface of the photoreceptor. Previously, it was necessary to trim (regulate) the toner that had been magnetically picked up on the mag roll to the optimum state for copying, and normally this trimming was done using a trimmer (a toner layer thickness regulating plate) placed around one side of the mag roll. ) is arranged, and the 4 tons of magnetic toner picked up by the trimmer collides with the rotating mag roll so that toner other than the specified amount does not pass through.
The specified value, that is, the layer thickness of the toner on the mag roll after passing through the trimmer, is generally a relatively small value of around 0.7 to 0.5 degrees, so the gear or trimmer gap created by the mag roll and trimmer is very large. I felt safe going for something small.

However, since this trimmer gap is very small as mentioned above, foreign matter such as paper, fibers, or hair mixed into the toner, or blocking toner caused by collisions between toners may get caught in this part. If the foreign matter accumulates, the amount of toner left after trimming by the trimmer on the mag roll will decrease, and if these foreign matter are thick and hard, and in the past there has been a combination of both, the toner on the mag roll will be removed. There will be almost no toner on the top, and the image corresponding to that area will become thinner, but in the worst case, there will be no image. The resulting copy image may be faded and difficult to see, or sometimes characters may be missing or misread, or the decimal point may disappear, resulting in fatal errors in information transmission. there were.

(Purpose of the Invention) The present invention has been made to eliminate the drawbacks of the above-mentioned conventional one-form development type developing device. It is an object of the present invention to provide a developing device for a copying machine or the like which can immediately remove copy defects when they are accumulated and produce normal copies.

(Structures of the Invention and the Invention) For this purpose, the present invention provides a certain gap when attaching the trimmer to the housing of the developing device, and an inverted-shaped plate is always inserted into the gap. When toner blocking occurs at the front lower part of the trimmer, or when a copy effect occurs due to accumulation of foreign matter, pull out the plate from the gap, and replace the cap with an insert plate with a magnetic material attached. This is characterized in that by inserting the toner blocking material, the toner blocking material is crushed and foreign matter is removed.

(Example) The present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 is a cross-sectional side view showing one embodiment of the developing device of the present invention, FIG. 2 is an exploded perspective view of a part of the trimmer, and FIG. 3 is the same,
It is a perspective view of an insertion board.

In these figures, a developing device R2r disposed around the photoreceptor is composed of a mag roll 3, a housing 4.5, a trimmer 6 attached to the housing 5, and the like. Then, the trimmer 6 is fixed to the housing 5 using screws 7.8, and spacers 9.10 having a predetermined thickness are interposed at both ends of the housing 5 and the trimmer 6. By identifying, a gap of a considerable length is provided between the housing 5 and the trimmer 6 in the image.

A plate member 11, which is normally inverted, is inserted into the gap, and the plate member 11 is attached to the housing 5 using a butterfly member 12.
At the same time, an insertion plate 13 is prepared separately from the plate 11, which has the same shape, is slightly longer, and has a magnetic material attached at an appropriate position at the bottom.

The present invention is constructed as described above. Next, its operation will be explained.

A monocomponent toner 14 is charged into the developing device 2 . Then, the toner 14 is conveyed by the rotation of the mag roll 3, transferred to the trimmer 6, and trimmed there, and then comes into contact with the surface of the photoreceptor 1 to convert the electrostatic latent image formed at the location into a visible image. become During this process, paper, fibers, hair, blocking toner, etc. get mixed into the toner 14, and these things get caught in the trimmer gap and accumulate there, or get stuck in the front lower part of the trimmer. When copy defect occurs due to toner blocking, the operator removes the *# element 12, pulls out the plate 11 from between the housing 5 and the trimmer 6, and inserts the plate 13 into the gap instead. By inserting the plate into the gap, the foreign matter can be removed from the location or the toner blocking can be crushed, and then the plate 11 can be reinstalled into the gap and the copying operation can be started again.

(Effect of the invention) The present invention is constructed and used as described above,
The trimmer 6 is placed in the housing 5, and a gap is created between the two using spacers 9 and 10, and the gap and the insertion plate 13 are used to remove foreign matter and dirt that accumulate in the trimmer young part. Since the toner blocking that occurs at the lower end of the trimmer 60F is removed, the removal work can be performed easily, accurately and quickly, and it is always effective if it helps to reduce the burden on the operator.

Similarly, there is no reason why the present invention must be limited to the above-mentioned embodiments, and it goes without saying that the shape of the plate body 11 and the insertion plate 13 may be other than the inverted shape. 13 itself may be entirely magnetic in addition to attaching a magnetic material, or may be made of iron or the like that does not contain any magnetic material at all. However, although cost reduction can be expected in this case, the workability is slightly inferior to the method using the magnetic material in terms of calming the magnetized toner.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view showing one embodiment of the developing device of the present invention, Fig. 2 is an exploded perspective view of a part of the trimmer, and Fig. 3 is a perspective view of the insertion plate. . In the figure, 1...photoreceptor, 2...developing device, 3...-
・・Maglor, 4.5・Fist T-hiro Housing, 6...
・Trimmer, 7.8... Lost item, 9.10... Spacer, 11... Board, 12... Butterfly screw, 1
3...Insertion board. Patent applicant: Fuji Serotox Co., Ltd. Agent (13981) Susumu Kawagoe (and 1 other person)

Claims (1)

[Claims] In a developing device that uses a one-component developer, a gap is provided in front of the trimmer of the developing device, approximately the same size as the trimmer, and a thin plate of an appropriate shape can be inserted into the gap. A developing device for a copying machine, etc., characterized in that it is capable of removing accumulated foreign matter or toner blockage generated at the lower front side of a trimmer.