JPH0624841Y2 - Corona discharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a corona discharger for an electrophotographic copying machine having a charging step of charging the surface of a photoreceptor with a corona discharger.

(Prior Art) Conventionally, the corona discharger as described above is one in which a corotron wire is stretched over an insulating support provided at both ends of the chassis of the discharger.

In the above structure, the corotron wire is stretched by screwing the both ends of the corotron wire to the wire support tools at both ends of the chassis of the discharger directly or via springs or the like.
Therefore, it takes a considerable amount of time to replace the corotron wire or adjust the tension of the extended corotron wire. Further, since the corotron wire uses a tungsten wire or a platinum wire having a diameter of 80 μ, it has a problem that it is easy to cut and the work of stretching the corotron wire becomes extremely difficult.

Therefore, as shown in Japanese Utility Model Laid-Open No. 59-82260, a hole is formed in the support portion for the purpose of locking and expanding the corotron wire with a simple operation, and the corotron wire is inserted by a fitting member. A corona discharger has been devised so that it can be caught and locked.

(Problems to be solved by the invention) However, in the above-mentioned conventional technique, even if the corotron wire can be easily stretched, the corotron wire is held in the locked state by pushing the fitting member into the hole, so The wire bends. As a result, the bent portion is deteriorated and the corotron wire is easily cut. Furthermore, unless the gap between the hole for holding the corotron wire and the fitting member is accurately obtained, a predetermined tension cannot be obtained after inserting the fitting member. Moreover, even if the fitting member is pushed into the hole, the fitting member is not locked and the corotron wire cannot be stretched.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a corona discharger having a simple structure and capable of easily stretching a corotron wire.

In addition, in a device to which such a high voltage is applied, it is necessary to make the insulation high so as to prevent unnecessary discharge. Another object of the present invention is to provide a corona discharger in which unnecessary conductive parts are not used near the corotron wire.

(Means and Actions for Solving Problems) The present invention relates to a corona provided with insulating supporting portions provided at both ends of a conductive chassis and a corotron wire stretched between the supporting portions. In the discharger, the supporting portion has a hole formed in the supporting portion and a fitting member locked in the hole, and the fitting member has a head having an outer shape larger than the diameter of the hole. , A body extending from one side of the head, and an end extending bifurcated integrally with the body, and a guide portion is formed at the end, and a body continuing to the end is formed. Has a ridge-holding part that is continuous with the guide part rather than the guide part, and the hole has a cylindrical shape in response to the end portion being tapered from the head direction. The hole is formed in a taper shape from the insertion direction of the fitting member in response to the end portion being formed in a cylindrical shape continuous with the body portion. It is characterized by being done.

That is, the corona wire can be stretched by sandwiching the corona wire in the holding portion of the fitting member and pushing the fitting member into the hole formed in the support member in this state. The above-mentioned object is achieved by this.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is an external perspective view of a corona discharger according to the present invention, which has insulating supporting portions 3a and 3b of a corotron wire 2 at both ends of a conductive metal chassis 1 and both supporting portions 3a. Although described later in detail, a locking portion for fixing one end of the corotron wire 2 is provided at 3b, and an external power connector terminal 4 is provided at one of the locking portions. A handle 5 for attaching / detaching the corona discharger to / from the main body of the copying machine is attached to the other supporting portion 3a. Each support part 3
Insulating cover plates 6a and 6b are inserted into the support portions of a and 3b.

The features of the discharger of the present invention will be described in more detail with reference to FIGS. 1 (a), (b) to FIG. FIG. 2 shows the support portion 3a in a state where the cover plate 6a is half opened. A recess 7a is cut in the support portion 3a, a tension groove 8a for the corotron wire 2 is provided in the inner portion, and an opening 91 is provided in the bottom of the recess 7a.
A cylindrical hole 9a having a width slightly smaller than that of the body portion 101 of 0 is bored so that the fitting member 10 can be inserted. The member having the hole 9a may be configured as a separate member and mounted on the support portion 3a. As shown in FIG. 4, the fitting member 10 includes a body 101 having a bullet shape, a holding portion 102 having a gap larger than or substantially equal to the thickness of the corotron wire 2, and a bifurcated end 106 (106a). , 106b) is formed with a guide portion 103 having a gap for guiding the corotron wire 2 to the holding portion 102 independently. The holding portion 102 is formed to have a space of 0 to 2 mm up to a neck portion 105 which is a boundary between the head portion 104 and the body portion 101. The cover plate 6a and the fitting member 10 are made of an insulating material. Further, it is convenient if the fitting member 10 has elasticity. The other supporting portion 3b is also formed with a similar recessed portion 7b as shown in FIG. 1 (b), the inner side is provided with a tension groove 8b of the corotron wire 2, and the bottom portion of the recessed portion 7b is provided. The hole 9b is bored, and the fitting member 10 is inserted. A conductive member 11 for electrically connecting the external power connector terminal 4 and the corotron wire 2 is arranged on the recessed portion 7b of the support portion 3b, and an opening 111 is provided so as to communicate with the hole 9b.

Next, the operation of stretching the corotron wire 2 on the corona discharger of the present invention will be described with reference to FIG. 1 (a).

The cover plate 6a is moved in the direction of arrow A to move the cover plate 6a to the concave portion 7 of the support portion 3a.
A is exposed and the fitting member 10 is pulled out, and then one end of the corotron wire 2 is inserted into the holding portion 102 through the guide portion 103 of the body portion 101 of the fitting member 10. Fitting member 10
The body portion 101 has a shape in which the end portion 106 has an inclination and is further elastic, and the hole 9 a is formed to be slightly smaller than the body portion 101. Therefore, when the fitting member 10 is inserted in the direction of arrow B from the upper portion of the opening 91 of the hole 9a, the guide portion 103 is deformed so as to approach. At that time, the fitting member 10 is pushed into the hole 9a until the bifurcated end portions 106a and 106b forming the guide portion 103 come into contact with each other. At the same time, the holding force of the corotron wire 2 in the holding portion 102 increases, and the corotron wire 2 is reliably locked by the above procedure. Therefore, the corotron wire 2 can be locked to the support portion 3a. The corotron wire 2 is guided to the other supporting portion 3b through the tension groove 8a, and the other end is locked to the supporting portion 3b to stretch the corotron wire 2 on the corona discharger. In the support portion 3b, as shown in FIG. 1 (b), the holding portion 102 includes the head portion 104 of the fitting member 10 and the body portion 1.
When it is formed up to the vicinity of the neck portion 105 which is a boundary with 01, the head portion 104 pushes the corotron wire 2 against the surface of the conductive member 11 by completely pushing the body portion 101 of the fitting member 10 into the hole 9a. . Therefore, the electrical connection with the external power supply connector terminal 4 is completed. Then, the cover plates 6a and 6b are inserted and returned to the original state. In this way, the corotron wire can be stretched easily without requiring any special tool. In the above-described embodiment, as shown in FIG. 4, the body 101 of the fitting member 10 has a screw shape and ends 106a, 1
It is obvious that the fitting member 10 can be easily guided to the openings 81a and 81b of the holes 8a and 8b because the slanted portion 06b is provided.

Note that, as shown in FIG. 5, a holding portion 61b that abuts the head portion 104 of the fitting member 10 may be provided on the side of the recessed portion 7b of the cover plate 6b. That is, by inserting the cover plate 6b, the pressing portion 61b always keeps the fitting state of the fitting member 10 in the hole 9b constant.

Further, as another embodiment of the fitting member, as shown in FIG. 6 (a), the fitting member 12 may have a configuration in which the inclined portion 122 is formed only on a part of the end portion 121 side.

Further, as long as the hole of the support portion has a shape that widens the opening and narrows as it goes deeper, it is not necessary to form the inclined portion on the body 131 as shown in FIG. 6B.
The fitting member 13 is configured such that the gap between the guide portions 132 is formed to be large and the movement amount of the both end portions 133a and 133b is increased to increase the holding force of the holding portion 134.

As can be seen from the above, the holding force of the corotron wire by the holding part is adjusted by the inclination angle of the inclined part formed on either the fitting member or the hole and the movement amount of the end part depending on the size of the gap of the guide part. be able to.

As still another embodiment, a shape that cannot be fitted into the hole unless the body portion of the fitting member is inserted in a predetermined direction, for example, FIG. 6 (c).
It may be configured as shown in. That is, the fitting member 14 has the direction restricting portion 142 in a part of the body 141. Needless to say, the holes on the side of the supporting portion are formed so as to correspond to the fitting members 14. With the above configuration, the fitting member has directionality and erroneous work of stretching the corotron wire can be prevented.

As another embodiment, as shown in FIG. 6 (d), the holding portion may be formed of a member having a high friction coefficient. That is, in the fitting member 15, the non-slip portion 151 including the sandwiching portion and the guide portion is formed as a separate member having a high friction coefficient, and the body portion 15
It is attached to 2.

(Effect) As described above, the corona discharger of the present invention makes it possible to stretch the corotron wire very easily. The tensioning is performed by pushing the fitting member, which holds the corotron wire, into the hole of the support portion so that the holding force of the corotron wire in the holding portion is increased and the work is reliably stopped. Since the assembling work of the fitting member only needs to move the fitting member downward toward the predetermined position, automatic assembling by a robot or the like can be easily realized.

[Brief description of drawings]

1 (a) and 1 (b) are cross-sectional views of a main part of a corona discharger, FIG. 2 is an enlarged view of the main part, FIG. 3 is an external perspective view, and FIG. 4 is an overall perspective view showing an embodiment of a fitting member. FIG. 5 is a sectional view of an essential part showing another embodiment of the supporting portion, and FIGS. 6 (a) and 6 (b),
(C) is an overall perspective view showing another embodiment of the fitting member. 1 ... Chassis 2 ... Corotron wires 3a, 3b ... Supporting parts 9a, 9b ... Holes 10 ... Fitting member 102 ... Holding part 103 ... Guide part

Claims (1)

[Scope of utility model registration request] 1. A corona discharger comprising an insulating support provided at both ends of a conductive chassis and a corotron wire stretched between the supports, the support being the support. A hole formed in the hole and a fitting member locked in the hole, the fitting member having a head shape having an outer shape larger than the diameter of the hole, and a body portion extending from one surface of the head section. , Having a bifurcated end integrally with the body,
A guide portion is formed at the end portion, and a body that is continuous with the end portion is provided with a narrower gripper holding portion continuously than the guide portion, the end portion being the head portion. The hole is formed in a cylindrical shape corresponding to the tapered shape from the direction, or the hole is formed in a cylindrical shape corresponding to the end portion being continuous with the body portion. A corona discharger, characterized in that the corona discharger is formed in a taper shape from the inserting direction of the fitting member.