JPH01188875A - Developing device - Google Patents

Abstract

PURPOSE:To regulate a gap between a sleeve and a blade without giving an unfavorable influence to a printing quality by constantly holding the gap between the blade and the sleeve with a Mylar while the Mylar is brought into contact with the circumferential surface of the sleeve of the range without any problem on printing. CONSTITUTION:A Mylar 2 is fitted at both edges of a blade 1, the Mylar 2 is brought into contact with both edges of a sleeve 3 of the range without any problem on printing, the blade 1 is mounted to an upper body 4, the parallelism of the sleeve 3 and the blade 1 is produced by the Mylar 2 and a gap G is held constantly. Thus, in the range without any problem, the Mylar 2 is inserted between the sleeve 3 and the blade 1. Thus, the gap G can be always constantly maintained and it is eliminated to damage the peripheral surface of the sleeve 3 which becomes a problem on the printing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing apparatus using an electrophotographic method, and particularly to a developing device.

[Prior Art 1] This type of developing device causes the henna adsorbed on the circumferential surface of the sleeve to adhere to a latent image on a carrier and develop the latent image into a visible image. By the way, in order to grow an appropriate amount of toner on the image carrier, it is necessary to control the amount of toner adhering to the circumferential surface of the sleeve. Conventionally, the gap between the play i and the sleeve has been adjusted using a gap adjustment jig.

[Problem to be Solved by the Invention 1] In a series of conventional developing devices, an adjusting jig is pressed against the circumferential surface of the sleeve within the range that causes printing problems to bring the blade parallel to the sleeve. It has the disadvantage that it damages the surface and has a negative effect on print quality.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a developing device in which the gap between the sleeve and the blade is regulated without adversely affecting print quality.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention provides a sleeve for supplying to an image bearing member 1 to 1 toner adsorbed on the peripheral surface thereof, and
In a developing device having a plate 1 for regulating the amount of toner absorbed on the surface of the sleeve, Mylar is attached to both ends of the blade, and the Mylar is brought into contact with the circumferential surface of the sleeve within a range that does not cause problems in printing. The Mylar is used to maintain a constant gap between the blade and the sleeve.

[Example J Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a front view showing the relationship between the blade and the sleeve.

In FIG. 1, a sleeve 3 having a built-in magnetic roller and which attracts toner in the main body 5 to its peripheral surface by magnetic force is rotatably installed in the bottom opening of a main body 5 of the developing device. An image carrier (not shown) on which an electrostatic latent image is formed is installed close to the sleeve 3 . 4 is the upper body.

As shown in FIGS. 1 and 2, the present invention uses Mylar 24 at both ends of the blade 1! - Attachment, attach the blade 1 to the upper body 4 with the mylar 2 in contact with both ends of the sleeve 3 within a range that does not cause printing problems, and use the mylar 2 to ensure parallelism between the sleeve 3 and the blade 1. The gap G is kept constant.

Therefore, according to the present invention, Mylar 2 is interposed between the sleeve 3 and the blade 1 within a range that does not cause problems in printing, and the Mylar 2 maintains a constant gap G between the sleeve 3 and the blade 1. Therefore, it is possible to always maintain the gap G constant, and furthermore, the circumferential surface of the sleeve 3, which would be a problem in printing, is not scratched.

Effects of the Invention] As explained above, the present invention uses the developer toner regulation system, so that a set amount of toner is fed into the sleeve, thereby preventing unevenness in the yield and fog. In addition, since no gap adjustment jig is used, there is no need to damage the sleeve, and there is no need to adjust the gap between the three I and the blade to a constant value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing an embodiment of the present invention;
It is a front view which does not show the relationship between a blade and a sleeve.

Claims (1)

[Claims] 1. In a developing device that has a sleeve that supplies the toner adsorbed on the peripheral surface to the image carrier and a blade that regulates the amount of toner adsorbed to the surface of the sleeve, Mylar is attached to both ends of the blade, and the Mylar is attached to both ends of the blade. A developing device characterized in that a gap between the blade and the sleeve is maintained constant by the mylar, which is brought into contact with the circumferential surface of the sleeve in a range that does not cause problems in printing.