JPH04126258U - Image forming device - Google Patents

Abstract

(57) [Summary] [Objective] To provide an image forming apparatus in which a developing device can be assembled without complicated adjustment of the main pole angle. [Structure] The case 3 is provided with a main pole angle setting section 3a in which a desired main pole angle θ is set by assembling the developing roller 2 to the developing case 3. [Effects] An image forming apparatus is provided in which the developing device can be assembled by simple work and in a short time without complicated adjustment of the main pole angle, and the manufacturing cost is reduced.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an image forming device, and in particular, the number of parts can be easily reduced in assembly and adjustment. The present invention relates to an image forming apparatus.

0002

[Conventional technology]

The developing device of conventional image forming devices has many parts and is complicated to assemble. Ta. Especially in image forming devices, the edge of the developing case of the developing device is viewed from the opening. At the same time, the developing roller attached to the developing case is installed to ensure optimal developing operation. Therefore, it is necessary to position and assemble it with respect to the photoreceptor. That is, image form In a developing device, there is a straight line connecting the center of the photoreceptor and the center of the developing roller, and a line connecting the developing pole and developing roller. The main pole angle with the straight line connecting the centers of the Position and fix the developing roller with respect to the developing case so that it reaches the specified value. Must-have.

0003 FIG. 3 is an exploded perspective view of a developing device in a conventional image forming apparatus. is divided into upper and lower parts, and the developing roller 202 and other parts are placed on the lower case 203. A front side plate 204 on which rotating parts are placed and which pivotally supports both ends of the shaft of the developing roller 202 and a rear side plate 204 The plates 205 are assembled to both ends of the lower case 203. At this time, use the developing roller For the developing roller 202, the main pole angle is not set, and both sides of the axis of the developing roller 202 are set. The end portion is attached to the front side plate 204 and rear side plate 205 assembled to the lower case 203. Both are temporarily held. Then, attach other parts to the lower case 203, and attach the upper parts to the lower case 203. After completing the assembly of other parts of the developing device, such as assembling the case, remove the developing roller. An adjuster 206 is attached to the slice surface 202a of the laser 202, and a predetermined The developing roller 202 is aligned with respect to the lower case 203 so that a predetermined main pole angle is obtained. The spindle position is determined by the adjuster 206.

0004

[Problem that the idea aims to solve]

By the way, the conventional image forming developing device described above is Since it is divided into many parts and then assembled, there are many parts. However, it is difficult to obtain the desired accuracy by simply assembling the parts. Therefore the final stage It is necessary to adjust the main pole angle using the adjuster 206. Requires separate parts such as Justa 206, and increases assembly man-hours and costs. It got expensive. The present invention has been made in view of the above-mentioned problems with image forming apparatuses. The aim is that the developing device can be assembled without adjusting the main pole angle, reducing the number of parts and assembly man-hours. The purpose of the present invention is to provide an image forming apparatus that can reduce costs by reducing .

[0005]

[Means to solve the problem]

The purpose is to arrange a developing roller containing a magnet in close proximity to and facing the photoreceptor. , a straight line connecting the center of the photoreceptor and the center of the developing roller, and a developing pole and the developing roller. The main pole angle formed with the straight line connecting the center of the roller is a predetermined value. In the image forming apparatus, the developing roller is positioned and attached to the developing case. In this case, a main pole angle setting section that sets the main pole angle setting section is connected to the developing case. This is achieved by the following.

[0006]

[Effect]

By the means, the developing roller is pivotally supported in the developing case when assembling the developing device. The main pole angle is determined in advance by the main pole angle setting section provided in the developing case. It is automatically set to a predetermined value, making assembly easy.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Here, Figure 1 is An exploded perspective view showing the configuration of the main parts of the embodiment, FIG. 2 shows the position of the developing device and photoreceptor of the embodiment. FIG. 3 is an explanatory diagram of the positional relationship.

[0008] As shown in FIG. 2, the developing device 11 includes a toner hopper 15 for replenishing toner. By rotating the agitator 16 provided in the toner hopper 15, the toner is Toner is supplied into the developing device 11 from a toner hopper 15. current The image device 11 includes a developing roller 2, a paddle roller 6, an elliptical plate 7, and a fin 9. A separator 8 is provided, and the developer in the developing device 11 is stirred by the elliptical plate 7 and then It is pumped up by paddle roller 6 and supplied to developing roller 2. Ru. The developer adsorbed on the developing roller 2 is scraped off to a certain thickness by a separator 8. , is supplied to the photoreceptor 1 by the rotation of the developing roller 2, and the latent image is developed. It is composed of

[0009] In this developing device 11, the center 1a of the photoreceptor 1 and the center 2a of the developing roller 2 are and the straight line connecting the developing pole P1 of the device and the center 2a of the developing roller 2. The main pole angle θ is set to a predetermined value for optimal developing operation. , the developing roller 2 must be positioned and fixed relative to the developing case 3. By the way, as shown in FIG. 1, in this embodiment, the developing case 3 is a lower case. 3C, a front side plate 3A, and a rear side plate 3B are integrally formed, and the front side plate 3A includes: A main pole angle setting section 3a is provided. On the other hand, there is a strip at one end of the shaft 2A of the developing roller 2. A rice surface 2a is formed, and a rear film is formed on the other end side of the shaft 2A of the developing roller 2. A lunge 2b is provided. Further, the rear side plate 3B is provided with a rear opening 3b. A bearing case 5 is set and screwed into the rear opening 3b. this bear A slide bearing 4 is press-fitted into the ring case 5.

0010 When assembling the developing device of the above embodiment, the sliced surface 2a of the developing roller 2 should be placed in front. Insert it into the main pole angle setting part 3a provided on the side plate 3A, and set it after the rear side plate 3B. The bearing case 5 with the sliding bearing 4 press-fitted into the opening 3b is inserted into the rear flange 2b. Insert and set it so that it is received, and tighten the screws. In this way, the main pole angle setting section 3a and the precision of the slice surface 2a, the current state assembled in the case 3 is The image roller 2 has a predetermined main pole angle set with respect to the photoreceptor 1 .

[0011] In this way, in the above embodiment, unlike the conventional image forming apparatus, the developing roller A main pole adjusting member such as an adjuster is no longer required to set the main pole angle between the photoconductors. Easily assemble with a predetermined main pole angle, reducing the number of parts and assembly man-hours. Therefore, the cost can be reduced.

0012

[Effect of the idea]

As explained above, according to the present invention, the adjustment member is provided separately as in the past, and the adjustment member is assembled separately. No need to stand, just assemble and the desired main pole angle will be automatically set. It is possible to reduce manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the configuration of essential parts of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the relationship between a developing device and a photoreceptor according to an embodiment of the present invention.

FIG. 3 is an exploded perspective view of a developing device of a conventional image forming apparatus.

[Explanation of symbols]

1 Photoreceptor 2 Developing roller 2a Slice surface 2b flange 3 Developing case 3a Main pole angle setting section 3A Front plate 3B Rear plate 3C lower case 4 Slide bearing 5 Bearing case

Claims (1)

[Scope of utility model registration request] 1. A developing roller having a magnet inside is disposed close to and facing a photoreceptor, and a straight line connecting the center of the photoreceptor and the center of the developing roller, and a line between the developing pole and the developing roller. In an image forming apparatus, the developing roller is positioned and attached to the developing case so that the main pole angle formed with a straight line connecting the center is a predetermined value set in advance,
An image forming apparatus characterized in that a main pole angle setting section for setting the main pole angle is provided in the developing case.