JPH06289690A - Method for fixing wire for discharge used for corona discharge device and wire for discharge used for it - Google Patents

Abstract

PURPOSE:To hardly break a wire for discharge when it is spread even when the wire diameter thereof is made extra fine. CONSTITUTION:One holding member 7 and the other holding member 8 are integrally formed on both end sides of a shield case 6. Then, both holding members 7 and 8 are constituted of bases 15 and 28 and fixing pins 16 and 29. Besides, a recessed part 24 in which the leg part 26 of the pin 16 is engaged is formed on the base 15 and a through-hole 37 in which the leg part 40 of the pin 29 is engaged is formed on the base 28. Then, the terminal part of one side of the wire for discharge 9 is fixed to a fixing device 51 and a weight 53 is hung on the terminal part of the other side thereof. After the wire 9 is spread between the bases 15 and 28 by prescribed tensil force, it is fixed by respectively engaging the pins 16 and 29 in the bases 15 and 28 together with both end parts of the wire 9 and making the wire 9 press-contact with the bases 15 and 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a discharge wire used in a corona discharge device incorporated in, for example, an electronic copying machine, an electrophotographic machine, an electrophotographic copying machine, an electronic printing machine, and the corona discharging apparatus. The present invention relates to a discharge wire used.

[0002]

2. Description of the Related Art Conventionally, for example, an end of a discharge wire used in a corona discharge device for charging a surface of an insulating drum in a charging step or a transfer step in an electronic copying machine is attached to a holding member. The mounting loop was formed. As shown in FIG. 16, such a mounting loop has a discharge wire 1 cut into a predetermined length.
00 is fitted with a metal pipe 101, the end of the discharge wire 100 is rolled into an annular shape, and the discharge wire 1
The leading end of No. 00 was passed through the metal pipe 101 again, and then the rolled ring was narrowed to form the loop 102, and the metal pipe 101 was fixed by spot welding, brazing, or the like. Further, as shown in FIG. 17, the loop 104 is formed by rolling the tip of the discharge wire 103, winding the tip around the discharge wire 103 itself, and welding the portion.
Had formed.

Further, as shown in FIG. 18, after inserting the end portion of the discharge wire 108 into the U-shaped mounting portion 107 of the metal terminal 106 integrally formed with the mounting loop 105, the mounting portion 107 is crushed. Spot welding is known. Then, as shown in FIGS. 19 and 20, an insulating rod 110 or an electrode rod 1 in which a discharge wire 108 such as these is attached to a shield case 109 is used.
In order to stretch the holding member 11 such as 11 under tension, the attachment loop 105 on one end side is hooked on the electrode rod 111, and a predetermined tension (about 200 g to 500 g) is applied to the discharge wire 108 on the attachment loop 105 on the other end side. Spring 112 giving
The insulating rod 11 through the spring 112.
It is done by attaching to 0.

[0004]

It should be noted that the thinner the wire diameter of the discharge wire is, the more stable the corona discharge is generated at a low voltage, and the more the corona discharge is generated at the low voltage, the less the generation of ozone is. It is generally known that when the wire diameter of the discharge wire 108 is set to be 0.05 mm or less, the strength of the discharge wire 108 is naturally weakened.
In particular, when the discharge wire 108 is stretched in a tensioned state on a holding member such as the insulating rod 110 or the electrode rod 111, the wire 112 may be broken near the mounting loop 105, which is relatively weak due to the tension of the spring 112, or may be discharged. Attach the mounting loops 105 on both sides of the wire 108 to the electrode rod 111 or the spring 11
When hooking on 2, it is a manual work to hook one after hooking on the other, so there was a problem such as disconnection with a weak force.

The present invention relates to a method of fixing a discharge wire used in a corona discharge device, which makes it difficult to break the discharge wire when the discharge wire is stretched, even if the wire diameter of the discharge wire is extremely thin, and the corona discharge device. The purpose is to provide a discharge wire for use in.

[0006]

According to a first aspect of the present invention, there is provided a method for fixing a discharge wire used in a corona discharge device for fixing a discharge wire for generating a corona discharge to a holding member, the holding member comprising: A base having a fitting portion such as a concave portion or a convex portion on the surface, and a fitting body having a fitted portion to be fitted to the fitting portion on an opposite surface facing the surface of the base, and After tensioning the discharge wire in a state where the end portion of the wire is projected from the end surface of the base, the portion of the discharge wire existing on the base is fitted with the fitting portion of the base and the fitting body. The technical means of crimping with the mating part of was adopted.

According to a second aspect of the present invention, there is provided a method for fixing a discharge wire used in a corona discharge device for fixing a discharge wire for generating a corona discharge to a holding member, wherein the holding member is a base, and the base is a base. A welding material that melts when heat is applied to the surface of the base is provided, and the discharge wire is tensioned after the discharge wire is tensioned in a state where the end portion of the discharge wire is projected from the end surface of the base, and then the discharge wire is The technical means of welding on the surface of the base using the above-mentioned welding material was adopted.

According to a third aspect of the present invention, in a corona discharge device in which a discharge wire for generating a corona discharge is stretched between holding members, when the wire diameter of the discharge wire is d,
The technical means satisfying 0.01 mm ≦ d ≦ 0.05 mm was adopted.

[0009]

According to the first aspect of the present invention, after the discharge wire is tensioned in a state where the end portion of the discharge wire is projected from the end surface of the base, the portion of the discharge wire existing on the base is removed. By fixing the discharge wire to the holding member by crimping between the fitting part of the base and the fitted part of the fitting body, even if the wire diameter of the discharge wire is made extremely thin, the discharge wire is broken. There is no such thing.

According to the second aspect of the present invention, after the discharge wire is tensioned with the end portion of the discharge wire protruding from the end surface of the base, the discharge wire is welded onto the surface of the base. By fixing the discharge wire to the holding member by welding using, the discharge wire will not be broken even if the wire diameter of the discharge wire is made extremely thin.

According to the third aspect of the present invention, since the wire diameter of the discharge wire is extremely small, that is, 0.01 mm or more and 0.05 mm or less, stable corona discharge is generated in the discharge wire at a low voltage. Further, since stable corona discharge can be obtained at a low voltage, the amount of ozone produced is reduced.

[0012]

Next, a method for fixing a discharge wire used in a corona discharge device of the present invention and a discharge wire used in the corona discharge device will be described based on a plurality of embodiments shown in FIGS. 1 to 15. [Structure of First Embodiment] FIGS. 1 to 11 show a first embodiment of the present invention.
An embodiment is shown, and FIGS. 1 and 2 are views showing an electrophotographic copying machine. The basic principle of the electrophotographic copying machine 1 will be described. First, a uniform charge is applied to the surface of the photoconductor 3, which is a dielectric material coated on the support 2, by corona discharge by the corona discharge device 4 (charging step), and a light pattern such as a character or a pattern is illuminated. An electrostatic image is formed by projecting as an image of (1) and developed with an electrostatic developer (toner) (developing step). Then, the toner image is transferred from the back surface of the paper P superposed on the paper P to the paper P side by corona discharge by the corona discharge device 5 (transfer step), and the toner is melted by heating the toner image, and as the toner cools. The paper P is fixed (fixing step).

Next, the structure of the corona discharge device 4 will be described in detail with reference to FIGS. 3 and 4. The corona discharge device 4
The shield case 6, one holding member 7, the other holding member 8, a discharge wire 9 and the like. The shield case 6 is made of a conductive metal, has a U-shaped cross section, and has a bottom wall plate 11 in which a substantially square hole 10 is formed, and a direction substantially orthogonal to both end portions of the bottom wall plate 11. Side wall plate 1 extending to
2 and 13. Two electrode pieces 14 serving as + electrodes are formed on the upper edge of one end of the side wall plate 13.

5 and 6 are an enlarged view and a sectional view showing one holding member. One holding member 7 is a base 15 fixed to one end of the shield case 6, and a fixing pin 1 for fixing one end of the discharge wire 9 to the base 15.
6 and. The base 15 is made of an electrically insulating transparent resin, has an open upper end, and has side plates 17 and 18 formed in the longitudinal direction of the discharge wire 9, and these side plate 1
It has side plate portions 19 and 20 formed on the sides of 7 and 18, and side plate portions 17 and 18 and a bottom plate portion 21 that closes lower ends of the side plate portions 19 and 20.

The side plates 17 and 18 are provided with slits 22 and 23 through which the discharge wire 9 is inserted. The side plate portions 19 and 20 are the side wall plates 1 of the shield case 6.
It is integrally formed at one end of the second and the third. The bottom plate portion 21 is formed with a circular recess 24 into which the fixing pin 16 is fitted. The concave portion 24 is a fitting portion of the present invention and is formed so as to be located on a substantially straight line with the slits 22 and 23. The fixing pin 16 is a fitting body of the present invention, and is made of a conductive metal material or an insulating resin material, and has a hemispherical head portion 25 and a fitting portion extending below the head portion 25. It has a foot portion 26. The foot portion 26 is formed with a slit 27 for locking one end portion of the discharge wire 9.

7 and 8 are an enlarged view and a sectional view showing the other holding member. The other holding member 8 is a base 28 fixed to the other end of the shield case 6, and a fixing pin 2 for fixing the other end of the discharge wire 9 to the base 28.
9 and 9. The base 28 is made of electrically insulating transparent resin, has an open upper end, and has side plate portions 30 and 31 formed in the longitudinal direction of the discharge wire 9 and these side plate portions 3.
It has side plate portions 32 and 33 formed on the sides of 0 and 31 and side plate portions 30 and 31 and a bottom plate portion 34 that closes lower ends of the side plate portions 32 and 33.

The side plates 30 and 31 are formed with slits 35 and 36, respectively, through which the discharge wire 9 is inserted. The side plate portions 32 and 33 are the side wall plates 1 of the shield case 6.
It is formed integrally with the other end portions of 2 and 13. In the bottom plate portion 34, a circular through hole 37 into which the fixing pin 29 is fitted,
Also, a pair of support bars 38 extending in the vertical direction are formed. The through hole 37 is a fitting portion of the present invention, and is formed so as to be located on a substantially straight line with the slits 35 and 36. In addition, the slit 22 of the side plate portion 17, the slit 35 of the side plate portion 30, and the pair of support rods 38 position the discharge wire 9 at the central portions of the side wall plates 12 and 13 of the shield case 6 and thus function as positioning means. Fixed pin 2
9 is a fitting body of the present invention, which is made of a conductive metal material and is used as a negative electrode. This fixing pin 29 is
It has a hemispherical head portion 39 and a foot portion 40 as a fitted portion extending downward from the head portion 39. Its foot 4
0 is a slit 4 for locking the other end of the discharge wire 9
1 is formed.

The discharge wire 9 is made of tungsten oxide, tungsten, gold, platinum, copper, which has a certain degree of rigidity.
Iron, molybdenum, aluminum, stainless steel (SUS)
Made of a conductive metal material such as
It is desirable to use relatively inexpensive tungsten. As shown in the graph of FIG. 9, as the wire diameter of the discharge wire 9 becomes smaller, stable corona discharge occurs at a lower voltage, and as shown in the graph of FIG. The thinner the wire diameter of 9 is (that is, the lower the corona discharge is generated), the less the generation of ozone. Therefore, the wire diameter of the discharge wire 9 is set to 0.01 mm or more and 0.05 mm or less, but the wire diameter of the discharge wire 9 is 0.01 mm in order to facilitate the manufacture and obtain the expected effect.
It is desirable that the thickness is 0.03 mm or less. The discharge wire 9 having a diameter smaller than 0.01 mm cannot be manufactured at present, and the wire having a diameter larger than 0.05 mm cannot be expected to have the above-mentioned effects.

[Operation of First Embodiment] Next, a method of fixing the discharge wire of this embodiment will be briefly described with reference to FIG. Here, in FIG. 11, reference numeral 51 in the drawing denotes a fixing device for sandwiching and fixing the tip of the discharge wire 9, and 52
Indicates a pulley, 53 indicates a weight that applies a predetermined tension (about 10 g to 200 g) to the discharge wire 9 when the discharge wire 9 is attached, and 54 indicates an attachment base. First, after fixing the tip of the discharge wire 9 to the fixing device 51, the discharge wire 9 is fixed to the side plate portion 1 of the base 15 of the one holding member 7.
It passes through the slits 22 and 23 formed in 7 and 18, respectively, and passes between the side wall plates 12 and 13 of the shield case 6.
Further, the discharge wire 9 is attached to the base 28 of the other holding member 8.
Slits 3 formed in the side plate portions 32 and 33 of the
Pass through 5, 36. Therefore, both ends of the discharge wire 9 are pulled out so as to project from the side surfaces of the bases 15 and 28. Then, the one end of the discharge wire 9 is hooked on the pulley 52 and lowered downward, and then the weight 53 is suspended at the tip thereof. As a result, a predetermined tension (about 10 g to 200 g) is applied to the discharge wire 9, and the discharge wire 9 is tensioned between the one holding member 7 and the other holding member 8.

At this time, electric discharge occurs above the recess 24 formed in the bottom plate portion 21 of the base 15 of the one holding member 7 and above the through hole 37 formed in the bottom plate portion 34 of the other holding member 8. The wire 9 is located. And the fixing pin 16
The fixing pin 16 is inserted into the recess 24 formed in the bottom plate 21 of one of the holding members 7 from the side of the foot 26 while the discharge wire 9 is inserted into the slit 27 formed in the foot 26. The discharge wire 9 with the base 15 and the fixing pin 16
Crimp between and.

At the same time, with the discharge wire 9 inserted through the slit 41 formed in the foot portion 40 of the fixing pin 29, the fixing pin 29 is moved from the foot portion 40 side to the bottom plate portion 34 of the other holding member 8. The discharge wire 9 is crimped between the base 28 and the fixing pin 29 by penetrating the formed through hole 37.
For this reason, since the tension of the spring is not applied and a weakened portion is not formed due to the loop formation, the discharge wire 9 is tensioned between the one holding member 7 and the other holding member 8 without breaking. Set up. After that, the corona discharge device 4 shown in FIGS. 2 and 3 is manufactured by cutting both sides of the discharge wire 9 so that the discharge wire 9 has a predetermined length.

[Effects of First Embodiment] As described above, in this embodiment, the discharge wire 9 can be stretched in a tension state without fixing the discharge wire 9 via the spring. In addition, since end processing such as forming loops at both ends of the discharge wire 9 can be eliminated, the wire diameter of the discharge wire 9 is 0.01 mm or more and 0.05 mm or less, particularly 0.01 mm or more 0 Even if it is very thin, less than 0.03mm, it will not break. Further, end processing such as forming a loop at both ends of the discharge wire 9 can be eliminated, and the discharge wire 9 can be fixed to one holding member 7 and the other holding member 8 at the same time. As a result, the number of assembling steps can be reduced and the assembling time can be shortened, and the cost can be reduced by not using a spring or the like. Furthermore, since the wire diameter of the discharge wire 9 is extremely small, stable corona discharge can be generated at a low voltage.
It is possible to make the power supply device that applies a high voltage to a compact one. Further, since corona discharge can be generated at a low voltage, ozone generation can be reduced. For this reason, it is possible to prevent a significant deterioration in image quality due to the inhibition of latent image formation when ozone adheres to the surface of the photoconductor 3. When the discharge wire 9 having a wire diameter of 0.01 mm or more and 0.03 mm or less is used, the amount of ozone produced can be significantly reduced, so that the ozone filter can be omitted.

[Second Embodiment] FIG. 12 is a view showing a second embodiment of the present invention. The holding member of this embodiment includes a base 62 having a through hole 61 formed therein, and a fixing pin 63 inserted into the base 62. The fixing pin 63
Has a hemispherical head portion 64 and a foot portion 65 extending downward from the head portion 64. And the discharge wire 9
When fixing the end portion of the discharge wire 9 from the base 62.
To fix the one end of the discharge wire 9,
A weight (not shown) is attached in advance so that a predetermined tension is applied to the other end portion, and the through hole 61 of the base 62 is attached.
Insert the foot 65 of the fixing pin 63 into the discharge wire 9
After crimping the end portion of the discharge wire 9 between the base 62 and the foot portion 65 of the fixing pin 63, the discharge wire 9 is cut to have a predetermined length. 62
It is fixed to.

[Third Embodiment] FIG. 13 is a view showing a third embodiment of the present invention. The holding member of this embodiment has a base 72 having a sawtooth-shaped convex / concave portion 71 formed on the surface thereof, and a sawtooth-shaped convex / concave portion 73 fitted to the convex / concave portion 71 on the opposite surface facing the surface of the base 72. The formed fitting body 74 is provided. When fixing the end portion of the discharge wire 9, the discharge wire 9 is extended from the base 72, the one end portion of the discharge wire 9 is fixed, and the other end portion of the discharge wire 9 is fixed. A weight (not shown) is attached so that tension is applied, and the end portion of the discharge wire 9 is attached to the convex / concave portion 71 of the base 72.
After crimping between the concave and convex portions 73 of the fitting body 74, the discharge wire 9 is cut into a predetermined length so that the end portion of the discharge wire 9 is fixed to the base 72. There is. Note that caulking may be used as the crimping method.

[Fourth Embodiment] FIG. 14 is a view showing a fourth embodiment of the present invention. The holding member of this embodiment has a rectangular parallelepiped base 8 whose surface is in contact with the end of the discharge wire 9.
1, and a thermoplastic resin 82 which is a spherical welding material provided on the surface of the base 81. And
When fixing the end of the discharge wire 9, the discharge wire 9 is extended from the base 81, one end of the discharge wire 9 is fixed, and a predetermined tension is applied to the other end. A weight (not shown) is attached so that the discharge wire 9 has a predetermined length after the end portion of the discharge wire 9 is welded onto the surface of the base 81 using the thermoplastic resin 82. By cutting in this manner, the end portion of the discharge wire 9 is fixed to the base 81. In this case, a stable tension can be applied to the discharge wire 9 as compared with the first to third embodiments.

[Fifth Embodiment] FIG. 15 is a view showing a fifth embodiment of the present invention. The holding member of this embodiment has a rectangular parallelepiped metal base 91 whose surface is in contact with the end of the stainless (SUS) discharge wire 9, and a melting material which is a welding material provided on the surface of the metal base 91. The metal 92 is provided. As the molten metal 92, a solder material containing tin, tin-lead, lead or, if necessary, antimony, silver, arsenic, bismuth and the like is used. Then, when fixing the end portion of the discharge wire 9, the discharge wire 9 is extended from the metal base 91 and the one end portion of the discharge wire 9 is fixed in the same manner as in the fourth embodiment. , A weight (not shown) is attached so that a predetermined tension is applied to the other end, and after the end of the discharge wire 9 is welded onto the surface of the metal base 91 using the molten metal 92, Discharge wire 9
The end portion of the discharge wire 9 is fixed to the metal base 91 by cutting the wire into a predetermined length. Even in this case, a stable tension can be applied to the discharge wire 9 as compared with the first to third embodiments. In addition,
Instead of the solder material as the molten metal 92, a brazing material such as silver brazing, brass brazing, nickel silver brazing, gold brazing, heat resistant alloy brazing, iron brazing or aluminum brazing may be used.

[Modification] In the present embodiment, the present invention is incorporated in an electrophotographic copying machine, but the present invention may be incorporated in an electronic copying machine, an electrophotographic machine, an electronic printing machine or the like. In the present embodiment, the present invention is used for the corona discharge device 4, but the present invention may be used for the corona discharge device 5 or may be used only for the corona discharge device 5. In this embodiment, the shield case 6,
Although one holding member 7 and the other holding member 8 are integrally formed and attached to the main body of the electrophotographic copying machine,
Each of the shield case 6, one holding member 7 and the other holding member 8 may be separately attached to the apparatus main body. Further, the shapes and materials of the base and the fitting may be freely changed as long as the insulation between the base and the fitting can be secured.

[0028]

According to the invention of claim 1 and the invention of claim 2, even if the wire diameter of the discharge wire is extremely thin, it is possible to prevent the discharge wire from breaking during the tensioning of the discharge wire. Can be tensioned. According to the invention of claim 3, since stable corona discharge can be generated in the discharge wire at a low voltage, the power supply device for applying a high voltage to the discharge wire can be made compact. Further, since stable corona discharge can be obtained at a low voltage, the amount of ozone produced is reduced, so that various adverse effects due to ozone production can be suppressed.

[Brief description of drawings]

FIG. 1 is a schematic view showing a charging step of an electrophotographic copying machine incorporating the present invention.

FIG. 2 is a schematic view showing a transfer step of an electrophotographic copying machine incorporating the present invention.

FIG. 3 is a plan view showing a first embodiment of the present invention.

FIG. 4 is a side view showing the first embodiment of the present invention.

5 is an enlarged view showing one holding member of FIG. 3. FIG.

FIG. 6 is a cross-sectional view showing one holding member of FIG.

FIG. 7 is an enlarged view showing the other holding member of FIG.

8 is a cross-sectional view showing the other holding member of FIG.

FIG. 9 is a graph showing the relationship between the voltage applied to the discharge wire and the wire diameter of the discharge wire.

FIG. 10 is a graph showing the relationship between the amount of ozone generated and the wire diameter of the discharge wire.

FIG. 11 is a schematic view showing a method of fixing the discharge wire according to the first embodiment of the present invention.

FIG. 12 is a sectional view showing a second embodiment of the present invention.

FIG. 13 is a sectional view showing a third embodiment of the present invention.

FIG. 14 is a sectional view showing a fourth embodiment of the present invention.

FIG. 15 is a sectional view showing a fifth embodiment of the present invention.

FIG. 16 is a plan view showing an end portion of a conventional discharge wire.

FIG. 17 is a plan view showing an end portion of a conventional discharge wire.

FIG. 18 is a plan view showing an end portion of a conventional discharge wire.

FIG. 19 is a plan view showing a conventional corona discharge device.

FIG. 20 is a schematic view showing a conventional method for fixing a discharge wire.

[Explanation of symbols]

 4 Corona Discharge Device 6 Shield Case 7 One Holding Member 8 The Other Holding Member 9 Discharge Wire 15 Base 16 Fixing Pin (Fitting Body) 24 Recess (Fitting Part) 26 Feet (Fit Part) 28 Base 29 fixing pin (fitting body) 37 through hole (fitting portion) 40 foot portion (fitted portion)

Claims (3)

[Claims] 1. A method of fixing a discharge wire used in a corona discharge device for fixing a discharge wire for generating a corona discharge to a holding member, wherein the holding member has a fitting portion such as a concave portion or a convex portion on a surface thereof. A base having, and a fitting body having a fitted portion fitted to the fitting portion on a facing surface facing the surface of the base, the distal end of the discharge wire from the end surface of the base After tensioning the discharge wire in a protruding state, a portion of the discharge wire existing on the base is crimped between the fitting portion of the base and the fitted portion of the fitting body. A method for fixing a discharge wire used in a corona discharge device, which is characterized in that: 2. A method of fixing a discharge wire used in a corona discharge device for fixing a discharge wire for generating a corona discharge to a holding member, wherein the holding member is a base and a surface of the base is heat-treated. A welding material that melts when added, after tensioning the discharge wire in a state where the end portion of the discharge wire is projected from the end surface of the base, the discharge wire is on the surface of the base. A method for fixing a discharge wire used in a corona discharge device, characterized in that the above-mentioned welding material is used for welding. 3. A corona discharge device in which a discharge wire for generating a corona discharge is stretched between holding members, where 0.01 mm ≦ when the wire diameter of the discharge wire is d.
A discharge wire used in a corona discharge device, characterized by satisfying d ≦ 0.05 mm.