JPH0318878A - Developing device - Google Patents

Abstract

PURPOSE:To prevent the contamination of an outside storage area, dust adhesion at the time of color interchange, the occurrence of a damage, etc., by providing an attachable and detachable protective cover. CONSTITUTION:The protective cover 5 capable of being easily attached and detached is provided and is attached when toner 2 is replenished and the color is interchanged for color recording. That is, the projecting part 5a of the protective cover 5 is engaged along a grooved part 4a provided outside the subject device, slided in the axial direction of a developing roller 1 and fixed. When the subject device is used, the protective cover 5 is detached and set on it. The grooved part 4a also can be provided on the side of the protective cover 5. Thus, storage area contamination and dust adhesion onto the developing roller 1 and the occurrence of the damage at the time of toner replenishment and the color interchange are easily prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a developing device used in an electrophotographic copy printer, etc.
6 shows a configuration diagram of this conventional developing device, 101 is a developing roller, 102 is a toner, 103 is a layer forming means,
103 is a toner supply member to the developing roller, 103b is a toner agitation supply unit, 103o is a blade that regulates the toner layer thickness, 104 is the entire developing device, and the developing device is configured as described above. 1041; L Above the developing roller 101 Toner stirring member 103b, toner supplying member 103. The blade 103o uniformly charges the toner 102 to make it a uniform thin layer, and the toner 102 is electrostatically attached to an electrostatic latent image on a photoconductor formed by a conventional electrophotographic charging/exposure means (not shown). Therefore, even if at least the portion of the developing roller 101 that faces the photoreceptor is exposed, the problem that the invention aims to solve is that, in recent years, small copy-like printers have been developed due to the demand for user maintenance, printing paper costs, etc. ,Although colorization by replacing the developing device is progressing, however, in the above-mentioned configuration, when the developing device is taken out and toner is replenished, the developer that is replaced when performing color recording by replacing the developing device is If the developing roller is constantly exposed to the outside, toner may spill due to vibration or shock.
．． There is also the problem that the storage area becomes dirty.Dust adhesion to the developing roller also causes scratches due to contact with other objects, which adversely affects the image.The present invention solves these problems with conventional developing devices. It is an object of the present invention to provide a developing device that can easily and at low cost prevent dirt in the storage area and dust and scratches on the developing roller. According to the present invention, the protective cover that can be easily attached to and removed from the developing device is useful for replenishing toner or storing a color developing device. Examples that can prevent dirt, dust from adhering to the developing roller, and the occurrence of scratches will be described below.Examples of the present invention will be described with reference to the drawings, but Fig. 1 shows the first embodiment of the present invention. 1 (a), (b) and (c), l is the developing roller, 2 is the toner, 3 is the layer forming means ℃, and 3- is to the developing roller l. The toner supply member 3h is a stirring and supplying part for toner 2, 3o is a blade that regulates the layer thickness of toner 2, 4 is the entire developing device, and 5 is the developing roller 1.
4. is a groove provided on the developing device 4 that engages with the protective cover 5. 5. is a convex portion provided on the protective cover 5 that engages with the groove 40 of the developing device 4. The operation of the developing roller of this embodiment, which is configured as shown in FIG. Installing. The mounting method is to engage the protrusion 5 of the protective cover 5 along the groove 4 provided on the outside of the developing device 4, and slide it in the axial direction of the developing roller 1. When removing the protective cover 5 and setting it in the device, the groove 4 may be provided on the protective cover 5 side.By constructing the protective cover 5 from an elastic resin such as polyethylene, special protection can be achieved. Even if there is no locking means for the cover 5, there is a risk that the cover will come off.
Figures (b), (c)! Friend: This is a diagram showing another manner of engagement between the protective cover 5 and the developing unit 4. Figure 2 is a diagram showing the state when toner is being replenished. Signs
According to this embodiment, as described above, the protective cover 5 is attached and the cartridge 6 containing new toner 2 is replaced.
The removable protective cover 5 of the developing roller 1 can easily prevent dust from getting on the developing roller 1 and scratches when the developing device 4 is stored or when replenishing toner or replacing colors, thereby reducing maintenance. Moreover, it is easy to attach and detach, and the structure is simple, so it is inexpensive. Figure 3 shows a configuration diagram of the developing device 4 in a second embodiment of the present invention.
In FIG. 3, similarly to the first embodiment, the protective cover 5 made of elastic polyethylene or the like can be attached to the developing device 4 by lightly fitting it onto the protrusion 4k of the developing device 4 from the exposed side of the developing device 4. It is not necessary to provide this protrusion 4b over the entire area (- In the above embodiment, the force explained in the example in which grooves and protrusions are provided in the developing device 4 and the protective cover 5 (unless it is removed during replenishment or transportation) It is not necessary to have these shapes, such as just pushing it in (~ Also, the characteristics such as non-magnetic property of the toner and the developing roller may be composed of a magnetic roller etc. As described in detail of the invention, the developing roller of the present invention According to the company, by providing a protective cover that is simple in construction, inexpensive, and easy to put on and take off, it is possible to prevent dust from accumulating and scratches when replacing the developing device when the external storage area is dirty. The practical effect is significant (~

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a developing device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing the state of toner replenishment to the developing device in the same embodiment. FIG. 3 is a cross-sectional view of a developing device according to a second embodiment of the present invention. A sectional view of a developing device in an example. FIG. 4 is a sectional view of a conventional developing device.・・Protective cover, 6・
...Toner cartridge, 7...Toner supply section tag

Claims (2)

[Claims] (1) A developing device comprising a developing roller protective cover that is removably attached to a developing device main body that includes at least a developing roller and a toner supply/layer forming member. (2) The developing device according to claim 1, further comprising the protective cover that can be engaged in the axial direction of the developing roller. (3) The developing device according to claim 1, further comprising the protective cover that is engageable from the exposed side of the developing roller.