JPS60466A - Developing device of copying machine or the like - Google Patents

Abstract

PURPOSE:To break and annihilate a toner blocking in a short time by providing so as to be movable up and down a thin plate on which the lower end part is provided in a comb-tooth or similar shape, on a suitable part of this side of a trimmer so that it has the same width as the trimmer and also is parallel to it. CONSTITUTION:A toner 19 is thrown in a developing device 2 in advance, and the toner 19 is carried to a trimmer 7 part as a magnetic roll 6 rotates, brought to trimming in this part, and thereafter, contacts to the surface of a photosensitive body 1, and converts an electrostatic latent image formed on its part to a visible image. In this process, a toner blocking is generated due to a fact that the toner 19 collides with the trimmer 7, adheres to the lower part of this side of the trimmer 7 by an energy of this collision time, and it grows gradually. This toner blocking generated in the lower part of this side of the trimmer 7 is broken by starting a motor 14 by an operator as necessary by the lower end part of a thin plate 8.

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 the 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 photoreceptor to create a visible image, a developer that uses toner and carrier is used. The one-component development method, which combines each function into one toner, allows the device to be made smaller, and does not require toner density spikes to adjust the development density.
It has the advantage that the device can be manufactured at a low cost, and since the problem of developer deterioration does not occur, stable copy image quality can be obtained at all times.

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 move the toner magnetically from the surface of the mag roll to the surface of the photoreceptor. Previously, it is necessary to trim (regulate) the amount of toner magnetically picked up on the mag roll to the optimum state for copying. Usually, this trimming is done using a trimmer (a toner layer thickness regulating plate) placed around one side of the mag roll. ) is arranged so that the magnetic toner picked up by the trimmer collides with the rotating mag roll so that toner other than a 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 0.7 to Q, 5 run fi
Since the value after f1 is relatively small, it is necessary to make the gear lag, that is, the trimmer gear lag created by the mag roll and the trimmer very small.

However, if this trimmer gap is made very small as mentioned above, the toner transported to the trimmer gap portion as the mag roll rotates will collide with the trimmer, and the energy generated when the roller 11 collides with the trimmer will cause the trimmer to be damaged. It adheres to the lower part of the front and causes toner blocking, and due to this toner blocking,
After trimming, the amount of toner on the mag roll, that is, the toner stack will decrease, and the image corresponding to this area will become thinner, or the toner blocking will be large.
Or if it is hard or even a combination of the two,
In the worst case, there is almost no toner on the mag wheel, and in the worst case, there is no image on the image.
Il! Making it difficult to see with a thin gold comb, or missing letters, misreading the number 8 when it becomes a 3, or missing the decimal point, causing fatal errors in information transmission9. There were a lot of shortcomings.

(Object of the Invention) The present invention has been made in order to eliminate the drawbacks of the conventional one-component developing type developing device described above, and it is an object of the present invention to easily and reliably crush toner blocking that occurs at the lower front side of the trimmer. It is an object of the present invention to provide a developing device bit for a copying machine, etc., which can prevent copy defects that have conventionally been caused by toner blocking.

(Structure of the Invention) For this purpose, the present invention arranges a thin plate whose lower end is shaped like a comb tooth or a similar shape at the front lower part of the trimmer of the developing device, parallel to the width of the trimmer, and extends the thin plate from the outside. The thin plate is forcibly moved up and down according to the power, and the toner blocking generated at the front lower part of the trimmer is crushed at the lower end of the thin plate.

(Example) Book V! Below, ΦUmaoi Benko will be explained in detail based on an embodiment shown in the drawings.

Fig. 1 is a cross-sectional view showing an embodiment of the developing device of the present invention, Fig. 2 is a partially enlarged exploded view of the thin plate part, and Fig. 283 is a partially cutaway enlarged view of the drive part of the thin plate. It is a side view of a dog.

In these figures, a developing device 2ii is arranged around the photoreceptor l, and a housing/
4.5, and remove the photoconductor L from the housing 4.5.
A mag roll 6 is rotatably arranged at the lower part of the housing 5 facing the side, and a trim mark is fixed between the upper part of the mag roll 6 and the lower end of the housing 5. In front of the trim mark, a thin plate 8 having approximately the same width as the width of the trim mark and having a lower end shaped like a comb tooth or similar shape is arranged parallel to the trim mark and movable up and down. As for its arrangement, a vertical elongated hole 9 is bored in the appropriate position of the sipe plate 3.3, and a shirt 10 is provided in the elongated hole 9 at an appropriate position in front of the thin plate 80, and a shirt 10 is connected to the lower part thereof. In addition to lowering the guide bar 1, a spring hanger 12 is provided at a suitable location just above the elongated hole 9 on the outside of the side plate 33, and a spring hanger 12 is installed between the spring hanger 12 and the shaft 10 of the thin plate 8. Attach the tension spring 13 and constantly pull it upward within the elongated hole 9. On the other hand, the shaft 1
0, the motor 14 is mounted at a suitable location on the outside of the side plate 3.3 with spacers 15... and long sleeves 16...
A cam 18 of an appropriate shape is added to the shirt 17 of the motor 14, and the cam 18 is brought into pressure contact with the end of the shaft 10, and as it rotates, the shaft 10 is It is used to kite the guide bar 11 in the elongated hole 9 and push it downward against the elastic force of the tension spring 13. Therefore, the length of the shirt 10 is such that the end portion of the guide bar 11 is made long enough to be brought into pressure contact with the cam 9.

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

Toner 19 is charged into the developing device 2 .

The toner 19 is conveyed to the trim mark section as the mag roll 6 rotates, and is trimmed there.
It comes into contact with the surface of the photoreceptor 10 and converts the electrostatic latent image formed there into a celebratory image. In this process, toner blocking occurs when the toner 19 collides with the trim mark, and due to the energy of this collision, it adheres to the front lower part of the trim mark and gradually grows. The thin plate 8
The material is crushed at the 0 and 10 ends as necessary, and this is done by an operator sending a starting command signal to the motor 14 from the outside to start it. That is, the motor 14 that has received the instruction to start rotates the cam 18 provided on the shaft 17 at the same time as the start.

As the cam 18 rotates, the shaft 10 of the thin plate 8 resists the elasticity of the tension spring 13 and is pushed down inside the elongated hole 9, and is returned to its original position by the restoring force of the tension spring 13. Repeat the return action. This shirt)1
The vertical movement of the thin plate 8 causes the thin plate 8 to break up the toner blocking generated at the front lower part of the plate. At this time, since the thin plate 8 is supported in the elongated hole 9 of the side plate 3.3 by a guide bar 11 in addition to the shaft 10 so as to be able to move up and down, horizontal vibration etc. will not occur during its operation. Moreover, since its lower end is formed into a comb tooth or similar shape, even if the toner is pressed during the vertical movement, the force will be dispersed.
No secondary toner blocking occurs. Furthermore, since the vertical movement of the thin plate 8 depends on the motor 14, which is an external power source, the crushing force is strong, and even if a large amount or very hard toner blocking occurs, it can be easily and quickly removed. It can be crushed. In addition, this thin plate 8 not only crushes toner blocking generated at the front lower part of the trim mark, but also
Needless to say, the toner can be used to crush blocking toner that has been blocked elsewhere, transported to that location, accumulated, and tends to cause copy defects.

(@Bright effect) The present invention V is constructed and operates as described above, and the lower end is formed into a comb tooth in front of the trim mark A I')f, with approximately the same width and parallel to this. Alternatively, by disposing a thin plate 8 having a similar shape so as to be movable upwards and moving the thin plate 8 up and down at that location, toner blocking that is about to occur at the lower end of the front side of the trim mark can be eliminated in a short time. Since the toner is easily and reliably crushed and extinguished, the trimmer gear sawing portion formed between the trim mark and the mag roll 6 is always maintained in a normal state, and the toner particles 731i Y are destroyed. Since trimming is always performed accurately, the image quality of the final copy will always be of stable and high quality, and therefore the reliability of copying machines etc. using this device can be significantly improved. have an effect.

However, there is no reason why the present invention should be limited to the above-described embodiment; for example, the drive mechanism for moving the thin plate 8 up and down may be other than using the tension spring 13 and the cam 18.

Needless to say.

[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 a partially enlarged exploded perspective view of a thin plate driving section, and FIG. 3 is a partially enlarged exploded perspective view of a thin plate driving section. It is an enlarged side view. In the figure, 1...photoreceptor, 2...developing device, 3...
・Side plate 1.4. ．． 5... Housing, 6... Magroll, 7... Trimmer, 8...
...Thin plate, 9...Long hole, lO...Fist shaft, 1
1・φe・Guide bar, 12・・Spring hanger, 13・・Tensile suspension ring, 14・Fist/motor, 15・・Spacer, 16・・・Long string,
17...1 shaft, 1B----p]mu, 19---
"Toner. Patented Kumijin Fuji Serotx Co., Ltd. 1゜

Claims (1)

[Claims] In a developing device using a one-component developer, a thin plate with a lower end shaped like a comb or similar shape is placed at a suitable location in front of the trimmer of the developing device, and the width of the thin plate is equal to the width of the trimmer.
have the same width and are arranged parallel to the trimmer, and by moving the thin plate up and down as necessary using an appropriate driving means, toner blocking that occurs at the lower end of the thin plate in front of the trimmer can be eliminated. A developing device for copying (cancer, etc.) characterized by being designed to be crushed.