JPS6011864A - Developing device - Google Patents

Abstract

PURPOSE:To adjust an interval with a high accuracy and with a good reproducibility by providing a screw for adjusting an interval of a developing roll and a tuft rise control member. CONSTITUTION:A tuft rise control member 6 is attached to a housing 2 of a developing device by a fixing screw 7 through a fitting hole 6a. A diameter of this fitting hole 6a is made larger than the outside diameter of the screw 7. Also, an adjusting screw 9b is screwed to the housing 2, and by a turning of this screw 9b, the tuft rise control member 6 is formed so as to be movable. In this way, an interval of the tuft rise control member 6 and a developing roll 3 is adjusted. By providing such an adjusting screw, the interval of the tuft rise control member 6 and the developing roll 3 can be adjusted in a fine quantity by a pitch of the adjusting screw. In this way, the interval of the tuft rise control member and the developing roll can be adjusted with a high accuracy and with a good reproducibility.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a developing device used in an electrostatic recording device such as an electrophotographic copying machine.

Conventional structure and its problems A conventional developing device of an electrostatic recording device rotatably supports a developing roll in a housing of the developing device, and the amount of developer adsorbed on the surface of the developing roll is regulated. A spike regulating member was fixed to a part of the casing of the developing device, facing the developing roll and spaced at a predetermined interval. In advance,
The distance between the developing roll and the spike regulating member has been determined by finding an optimum range specific to the electrostatic recording device and fixed at a predetermined position.

In addition, in some conventional products, the mounting hole of the spike control member is a full-length hole that can be adjusted freely within the range of the elongated hole.
In many cases, the range is about 1 to 4, and the above range is particularly common when a two-component developer consisting of two components, carrier and toner, is used.

Therefore, an error of about 0.2 mm in the setting accuracy of the distance between the spike regulating member and the surface of the developing roll does not cause a difference in the image. A structure that fixed within the adjustment range was sufficient.

However, in order to obtain a fine line image of better quality than before and an image with high black density, a developing method has been proposed, namely, the distance between the surface of the photoreceptor and the surface of the developing roll.
In order to realize a developing method in which the thickness of the developer adsorbed on the surface of the developing roll is set to 1 mm or less, the accuracy of setting the distance between the spike regulating member and the surface of the developing roll must be 0.1 mm. You are required to adhere to your own tolerances. In order to meet the above-mentioned required accuracy, the structure of a conventional developing device in which a round or oblong mounting hole is directly tightened with a fixing screw requires retightening by trial and error.

Assuming that the optimum spacing between the spike control member and the developing roll surface is 07, the thickness of the developer adhering to the developing roll surface is 14% compared to the optimal condition at the spacing of o and emu.
% decrease, the image becomes slightly blurred, and at an interval of 0.8πm, the thickness of the developer attached to the developing roll surface is 14
This can cause too much toner to adhere to fine-line images, making them thicker and crushing fine-line drawings and fine text. Therefore, remove the developer in the developing device in advance, and check the knockness gauge between the brushing regulation member and the developing roll. Even if the developing device is set up between the surfaces, when you actually put the developer in and print an image, it turns out that you need to readjust 0.1 points.
The conventional structure has the disadvantage that readjustment is practically impossible and must be given up due to the uncertainty of the settings.

In addition, Fig. 1 is a sectional view of the main part of the conventional example.
2 is a photosensitive drum, 2 is a housing of a developing device, and 3 is a developing roll, in which a fixed magnet 4 is provided.

Reference numeral 5 represents a developer, and reference numeral 6 represents a spike control member, which is fixed to the housing 2 by a fixing screw 7 inserted through an elongated hole 6a. Reference numeral 8 denotes a lid of the housing, which can be removed from the housing 2 when setting the distance between the developing roll 3 and the bristling regulating member to a predetermined desired value.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the above-mentioned conventional examples and to provide a developing device equipped with an adjustment mechanism that can adjust the distance between the spike regulating member and the surface of the developing roll with high precision and high reproducibility. do.

Structure of the Invention The present invention includes a developing device casing, a developing roll, a blistering regulating member, an adjustment screw, and a regulating member fixing means, and the buffing regulating member is attached to the developing device casing. Attached by the regulating member fixing means, the adjusting screw is screwed to the casing of the developing device, and the spacing between the developing roll and the buffing regulation member is adjusted by moving the buffing regulating member using the adjusting screw. It can be freely configured.

Description of examples Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a sectional view of essential parts of a developing device according to an embodiment of the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. FIG. 3 is a partially cutaway perspective view of the same embodiment.
The inside is shown with the developer removed and the lid 8 removed.

In those drawings, the ear standing regulation member 6 has a mounting hole 6a.
There are two locations. The shape of the mounting hole 6a is a round hole larger than the outer diameter of the threaded portion of the fixing screw portion. Fit the spring washer 7a and flat washer 7b to the fixing screw 7, penetrate the mounting hole saK of the iIJ-recorded ear standing regulation member 6, screw it into the regulating member part 2a provided in a part of the housing 2, and then Standing regulation member 6
is installed. The adjustment screw 9 is screwed into the regulation member attachment part 2a so that its tip protrudes, and the adjustment screw 9a has its tip surface in contact with the spike regulation member 6, and the hole 2b provided in the regulation member attachment part 2a. Adjustment screws 9b whose tips are screwed into the ear-standing regulating member θ are provided near both ends of the ear-standing regulating member 6. As the fixing screw 7 is tightened, the spring washer 7a is compressed, and the spring force causes the contact surface between the flat washer 7b and the ear-standing regulating member 6, and the contact surface between the ear-standing regulating member 6 and the regulating member mounting portion 2a of the casing. Apply pressing force to the contact surface. This pressing force generates a frictional force between the two abutment surfaces, thereby holding the ear standing regulation member 6 in the regulation member mounting portion 2a of the housing. If the adjusting screws 9a and 9b are each right-handed, when turned clockwise, the adjusting screw 9a directly pushes down the ear standing regulation member 6, and the adjusting screw 9b directly pulls up the ear standing regulating member 6, so that the spring It is possible to overcome the frictional force due to the spring force of the washer 7a, that is, the holding force of the ear standing regulating member 6 to the regulating member mounting portion 2a of the casing, and push down or pull up the ear standing regulating member 6. Adjustment screw 9
For example, in order to separate the spike regulating member 6 from the developing roll 3 so that the color and the force of the 9b do not conflict, the adjustment screw 9 is set in advance.
Turn a counterclockwise and adjust the amount by which you want to move it from the tip of the adjustment screw 9a and the surface of the spike control member 6.
Separate it further, then turn the adjustment screw 9b clockwise to pull up the ear standing regulating member 6, and conversely, create some room for it to move downward by twisting the adjustment screw 9b counterclockwise. By turning the adjustment screw 9a clockwise, it is possible to push down the ear standing regulating member 6.

If you use a fine screw with a fine pitch, the pitch will be 0.36mm with an M3 screw, so it will be 0.1mm in the axial direction of the screw.
To move MM, it can be achieved by turning about 103 degrees,
Even when using a coarse screw, this can be achieved by turning it 72 degrees.
Even with a movement of only 0.01 mm, there is a rotation angle of approximately 10 degrees for a fine screw and 7 degrees for a coarse screw, so the spike control member 6
It is relatively easy to move consciously by about 0.1 questions.

Further, even if the fixing screw 7 is strongly tightened to such an extent that the bristling regulating member 6 does not sufficiently slide against the regulating member mounting portion 2a of the housing while the developing device is in use, the buffing regulating member The holding force of the housing No. 6 to the regulating member mounting portion 2a is due to the frictional force generated by the tightening force by the fixing screw 7 as well as via the spring washer 7a, and the pulling force and pushing down force by the adjusting screws 9a and 9b are directly generated. Since the force is to pull or push down the regulating member 6, the adjustment screw 9a9b
The structure is such that the ear standing regulating member 6 can be moved by applying the same tightening force as that applied to the fixing screw 7.

(Left below) In the above embodiment, the spring washer 71L is fitted to the fixing screw 7, but instead of the spring washer 7a, a ring-shaped washer made of urethane rubber or the like with repulsive force may be fitted. A similar effect can be obtained, and by selecting urethane rubber of arbitrary hardness and thickness, the tightening force of the fixing screw 7 and, by extension, of the adjusting screws 9N and 9b can be increased.

It is also possible to configure the adjustment torque to be reduced.

Further, it goes without saying that the same effect can be obtained even if the regulating member fixing means using a screw and a spring washer is replaced by a suppressing means using a compression spring.

In addition, in this embodiment, the regulating member mounting portion 2a of the H1 body is attached to the housing 2.
Although it has been described as a part of the regulating member mounting plate, it goes without saying that the regulating member mounting plate may be a separate component and then fixedly attached to the housing 2.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention has the advantage of being able to adjust the distance between the spike control member and the surface of the developing roll with high precision and high reproducibility.

In addition, hold the bristling regulating member on the regulating member mounting portion of the housing with a regulating member fixing means such as a fixing screw, with a holding force sufficient for practical use of the developing device, and then use an adjustment screw to hold the buffing regulating member until the It has the advantage of being able to move a minute amount.

Further, in the present invention, since a very ordinary round head machine screw can be used as the adjustment screw, it has the advantage that it can be realized at low cost and in mass production.

Since the present invention has the above-mentioned advantages, it has the effect of realizing a developing method that requires high precision in the spacing between the developing roll and the stand-up regulating member, which has not been thought of in the past, as a developing device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of a conventional developing device, FIG. 2 is a sectional view of the main part of an embodiment of the present invention, and FIG. FIG. 3 is a cutaway perspective view. 2... Housing, 3... Developing roll, 6...
...Developer, 6...Standing control member, 7
・・・Fixing screw, 9・・・Adjusting screw・

Claims (2)

[Claims] (1) A developing device includes a sieve body, a developing roll, a bristling regulating member, an adjustment screw, and a regulating member fixing means, and a developing device has a sieve body, a developing roll, a buffing regulating member, an adjustment screw, and a regulating member fixing means, and the buffing regulating member is fixed to the regulating member fixing means in a casing of the developing device. At the same time, the adjustment screw is screwed into the casing of the developing device, and the spacing between the developing roll and the buffing regulation member can be adjusted by moving the buffing regulating member using the adjusting screw. A developing device characterized by: (2) The scope of claims characterized in that the regulating member fixing means is composed of a screw and an elastic washer, and the spike regulating member is held between the washer and the casing of the developing device. The developing device according to item (1).