JPS5890661A - Corona discharger of electrostatic copying machine - Google Patents

Abstract

PURPOSE:To adjust a discharging conductor in parallel to a photoreceptor easily and securely through simple constitution by adjusting the interval between the discharging conductor and photoreceptor through the spiral groove of a freely rotatable adjusting means. CONSTITUTION:A discharging conductor 9 provided in a corona discharger body 5 engages a spiral groove 34 provided in a shaft 32 constituting a freely rotatable adjusting means 18 together with a head part 33. Therefore, when a tool is fitted in the groove of the head part 33 to rotate the shaft 32, the conductor 9 moves up on down to adjust the interval to the photoreceptor. This single means of simple constitution adjusts the discharging conductor in parallel to the photoreceptor easily and securely.

Description

[Detailed description of the invention] In an electrostatic copying machine, a photoreceptor is stretched parallel to the surface perpendicular to the moving direction of the photoreceptor and across the entire width of the photoreceptor in the curved direction, and is stretched toward the photoreceptor. The present invention relates to a corona discharger for an electrostatic copying machine having a discharge conductor for performing corona discharge.

In order to perform uniform corona discharge over the entire width perpendicular to the direction of movement of the photoreceptor, the discharge conducting wire is preferably stretched substantially parallel to the surface of the photoreceptor in the direction perpendicular to the direction of movement of the photoreceptor. On the other hand, conventionally, such a corona discharger has been constructed such that it can be housed in or removed from the body of a copying machine in order to facilitate maintenance and inspection work. Therefore, there is a risk that the position of the discharge conductor wire relative to the photoconductor may shift, and it is necessary to provide the corona discharger with an adjusting means for adjusting the discharge conductor wire parallel to the photoconductor.

In summary, in the prior art, the structure of the adjustment means is complex, has a large number of parts, and is therefore expensive.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a corona discharger for an electrostatic copying machine that can adjust a discharge conductor parallel to a photoreceptor with a simple construction.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention,
Figure @2 is a sectional view taken along section line II-II in Figure 1. In addition, FIG. 2 shows the corona discharger 1 of the present invention and a photoreceptor 3 formed on the outer periphery of the drum 2. ! The arrangement with a photosensitive drum 4 for forming an image is also shown.

The corona discharger 1 is provided close to the photosensitive drum 4, and uses corona discharge to charge the photosensitive member 3, transfer the toner image formed on the surface of the photosensitive member 3 onto copy paper, and charge the toner image on the photosensitive member 3. It is used to remove charges that accumulate on the surface.

The corona discharger 1 includes a main body 5 having a substantially U-shaped cross section in the longitudinal direction, that is, perpendicular to the rotational axis of the photosensitive drum 4, fixing means 6.7 attached to both ends Kli of the main body 5, and fixing means 6.
, 7 in the main body 5 parallel to the photoreceptor 3 and the photoreceptor 3
The discharge conductor 9 is stretched over the entire width perpendicular to the moving direction 8 of the discharge conductor 9.

The main body 5 is made of a conductive material, such as metal, and includes a pair of side walls 10.11 and a bottom plate 12 connecting the end of the side wall 10.11 on the side facing away from the photoreceptor 3.

FIG. 3 is a sectional view taken along the section line 111-III in FIG. 1, FIG. 4 is a plan view of FIG. 3, and FIG. It is an enlarged perspective view of the vicinity. In addition, in FIGS. 3 to 5, the rectangular covers 13, 14 of each fixing means 6, 7 are omitted. 6 fixing means, case body 15, and case body 15
A screw member 16 for attaching to the main body 4.5, a screw member 17 for fixing one end of the discharge conductor, and a screw member 17 for adjusting the height of the discharge conductor (vertical height in Fig. 3). adjustment means 18. The case body 15 includes a rectangular bottom plate 19 and side plates 23 erected on four edges of the bottom plate 19. The bottom plate 19 includes a protrusion 25 formed with an internal thread 24 for screwing the screw member 16;
A protrusion 27 is provided with an internal thread 26 for screwing the screw member 17 thereon. Note that the internal screw 24 is attached to the bottom plate 19.
The side is open, and the upper end side away from the bottom plate 19 with internal threads 26 is open. A through hole 28 is formed in the bottom plate 12 of the main body 5 in correspondence with the internal thread 24, and the threaded member 16
The inner screw 24 is inserted from the outside of the bottom plate 12 through the through hole 28 of the cage.
is screwed onto. As a result, the case body 15, that is, the fixing means 6 is attached to the body 5. Discharge conductor #i!
One end of the discharge conductor 9 is locked to a screw member 17, and the screw member 17 is screwed onto the inner screw 26, whereby one end of the discharge conductor 9 is fixed to the fixing means 6.

Among the side plates 20 to 23 of the case body 15, a side plate 20 disposed in the longitudinal direction of the body 5, that is, in the left-right direction in FIG.
, 21, a handle 30 extending outward in the longitudinal direction is fixed to one side plate 20 disposed outward in the longitudinal direction of the main body 5. A recess 31 for supporting the end of the discharge conducting wire 9 is formed in the other side plate 21 of the side plates 20.21. This notch 31Y'i extends in a direction perpendicular to the photoreceptor 3 (vertical direction in FIG. 3).

FIG. 6 is a sectional view taken along the section line Vl--Vl in FIG. 3. Adjustment means 18, lN1 between protrusion 27 and side plate 21
K intervened. The adjusting means 18 includes a shaft portion 32 having an axis perpendicular to the photoreceptor 3 and a dish-shaped head 33 formed at the end of the shaft portion 32 on the side facing away from the photoreceptor 3. The shaft portion 32 is formed with a spiral groove 34 around its axis, with which the end of the discharge conducting wire 9 is engaged. The head 33 allows rotation of the axis of the shaft portion 32 and rotates the case body 1.
It is immediately installed on the bottom plate 19 of 5. A through hole 36 is formed in the bottom plate 12 of the main body 5 in correspondence with the head 33.

The diameter d1 of the through hole 36 is selected to be smaller than the diameter d2 of the head 33. This allows the adjustment means 18 to
Karakuki is prevented from being taken out. Note that a fitting groove 35 is formed in the head 33 into which the tip of a screwdriver or the like pushed through the through hole 36 can fit.

The adjusting means 18 formed in this manner is formed of an electrically insulating material such as synthetic resin.

Referring again to FIGS. 3 and 4, the fixing means 7 includes a case body 40 formed similarly to the case body 15 of the fixing means 6, a spring member 41, and a terminal member 42. Similar to the case body 15, the case body 40 includes, for attaching the case body 40, that is, the fixing means 7 to the body 5.
A protrusion 43 formed similarly to protrusion 25 is provided. In the case body 40, a notch 48 is formed in the side plate 46 facing the side plate 21 among the sides &46, 47 arranged in the longitudinal direction of the body 5, similar to the notch 31 in the side plate 21. The height hl from the bottom plate 12 of the main body 5 to this notch 48 is the height hl from the bottom plate 12 of the main body 5 to the notch 31.
0 selected to be larger than 2 (The spring member 41 is a conductive coil spring, and the other end of the discharge conductor 9 is locked to one end of the spring member 41. It is locked to a connecting member 50 electrically connected to the terminal member 42.Terminal member 42#i side plate 4
A connecting protrusion 51 fixed to 7 and bored outward of the side plate 47
Equipped with. The discharge conductor 9 is biased outward in the longitudinal direction of the main body 5 (to the right in FIG. 3) by the spring member 41. As a result, the nine discharge conducting wires are elastically stretched between the i-end of the screw member 17 and the barbed portion 141.

The corona discharger configured in this way is attached to the body of the electrostatic copying machine (
(not shown) is removable. When the corona discharger is installed in the machine body, the connection protrusion 51 of the terminal member 42 can be fitted into a terminal (not shown) provided inside the machine body for supplying electric power.

To adjust the discharge conductor 9 parallel to the photoconductor 3, fit the tip of a tool such as a screwdriver into the fitting groove 35 formed in the head 33 of the adjusting means 18, and rotate the driver. The adjusting means 18 is rotated around an axis perpendicular to the photoreceptor 3. Thereby, the groove 34 of the adjusting means 18
The portion 9a of the discharge conducting wire 9 engaged with is guided and moved in the axial direction perpendicular to the photoreceptor 3, that is, in the vertical direction in FIG.

Therefore, the distance 11 from the portion 9b of the radiation conductor 9 supported by the notch 48 of the side plate 46 to the photoreceptor 3, and the distance Ml from the portion 9a to the photoreceptor 3! 2 are made equal to each other, and the discharge conducting wire 9 can be made parallel to the photoreceptor 3 accordingly.

FIG. 7 is a partial perspective view of another embodiment of the invention. This FIG. 7 corresponds to FIG. 5 of the above-described embodiment, and corresponding parts in FIG. 5 are given the same reference numerals. What should be noted in this embodiment is that a pair of mutually parallel discharge conducting wires 70 and 71 are stretched within the main body 5. The discharge conductor 70.71 consists of a single conductor 73-, the end of which is engaged with 11t34 of the adjusting means 18. In such an embodiment, the adjusting means 18 not only allows the discharge conductors 70 , 711 to be adjusted parallel to the photoreceptor 3 , but also allows one end of each of the discharge conductors 70 , 71 to be placed within the fixing means 72 . Can be fixed. Therefore, it is not necessary to provide the screw member 17 and the protrusion 27 in the case body 15 in the above-described embodiment, and the structure and configuration can be made even simpler.

As described above, according to the present invention, the discharge conductor can be adjusted parallel to the photoreceptor by a single adjustment means, so the structure is simple and the number of parts can be reduced.
It becomes possible to manufacture it at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the external appearance of an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the section line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view taken along the cross-section line ■-■ in Fig. 1. 4 is a plan view of FIG. 3, and FIG. 5 is a sectional view of the fixing means 6 shown in FIGS. 3 and 4.
Enlarged perspective view of the vicinity, Figure 6 Fi Figure 3 Glue cross section ■
7 is a partial perspective view of another embodiment of the present invention. 3... Photoreceptor, 5... Main body, 6, 7.72... Fixing means, 8... Moving direction, 9, 70.71... Discharging conductor, 18... Adjusting means, Agent Patent Attorney Kei Nishikyo Part 3 Figure 7 Figure 4 Figure 6 Continued from page 1 0 Inventor Masahiro Watashi 0 Inventor Kiyonori Yamamoto 1-2-28 Tamatsukuri, Higashi-ku, Osaka City Mita Kogyo Co., Ltd. 0 authors: Toshihiko Yamamoto, 1-2-28 Tamatsukuri, Higashi-ku, Osaka City, Mita Kogyo Co., Ltd. 0 authors: Shinsuke Yoshinaga, 1-2-28 Tamatsukuri, Higashi-ku, Osaka City, Sanda Kogyo Co., Ltd.

Claims (1)

[Scope of Claims] In an electrostatic copying machine, the photoreceptor is stretched parallel to a surface perpendicular to the direction of movement of the photoreceptor and over the entire width of the photoreceptor in the perpendicular direction, and is used for performing corona discharge toward the photoreceptor. In a corona discharger of an electrostatic copying machine having a discharge conductor, the discharge conductor has a spiral shape that is rotatable around an axis perpendicular to the photoreceptor and around which the end of the discharge conductor is held. An electrostatic copying machine characterized in that the distance between the discharge conductor and the photoreceptor is adjusted by providing an adjusting means having a groove formed therein, and rotating the adjusting means around the axis. corona discharger.