JPH0740159B2 - Charger - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an image forming apparatus such as an electrophotographic copying machine and an electrostatic recording device, and more particularly to a charger used in such an image forming apparatus. It is a thing.

2. Description of the Related Art Conventionally, many chargers have been used in image forming apparatuses such as electrophotographic copying machines and electrostatic recording devices. Particularly, in a transfer charger and a separation charger, the charger of the charger is usually used. A transfer material such as transfer paper passes over the opening portion of the shield plate having a V shape. At this time, the transfer material enters the charger from the opening of the shield plate of the charger and approaches the discharge member such as the charging wire provided in the shield plate, or in the worst case, the transfer material comes into contact and is disconnected. As a preventive measure, a guide wire such as a nylon wire (Tegus wire) that guides the transfer material is usually installed over the opening of the shield plate.

Further, in the case of a transfer charger, there is a transfer charger which is equipped with a destaticizing needle for separating the transfer material from an image carrier such as a photoconductor drum. In such a transfer charger,
In order to prevent the transfer material from coming into contact with and approach the static elimination needle, and to guide and support the transfer material, a guide wire is installed not only on the opening of the shield plate but also on the static elimination needle.

On the other hand, in order to maintain transfer and further separation performance, in the case of a transfer charger, clean the shield plate and charging line, and
In the case of the charge elimination needle, the needle portion must be kept in a state where it is not contaminated with toner or the like. Therefore, it is necessary to clean and replace the transfer charger and the charge elimination needle at regular intervals.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in a conventional transfer charger or the like, the guide wire is wound around a shield plate or the like, or is fixedly wound around a notch formed in the shield plate. The guide wire interfered and the shield plate and charged wire could not be cleaned sufficiently. Also, if the guide wire is removed from the shield plate to replace or clean the charged wire, it is very difficult to re-attach the guide wire to the shield plate with the correct sequence and proper tension after the work. Yes, it required skill. In particular, the order in which the guide wires are hung often requires mistakes because a specific way is required to prevent the transfer material from rushing into the guide wires. As a result, it hinders transportation, and as a result, the transfer material stays in the vicinity of the charging line, causing a fire.

Therefore, an object of the present invention is to provide a charger in which the guide wire can be easily attached and detached, and the charging wire and further the charge elimination needle can be easily replaced and cleaned.

Means for Solving the Problems The above object is achieved by the charger according to the present invention. In summary, the present invention provides a charger that includes a discharge member, a shield plate that has an opening and faces the discharge member, and a guide wire that crosses the opening and guides a sheet. The charger holds the guide wire. The charger has a guide wire holding member, and the guide wire holding member is detachably attached to the shield plate while holding the guide wire.

Embodiment Next, the charger according to the present invention will be described in more detail with reference to the drawings.

1 and 2 show an embodiment of the charger according to the present invention. In this embodiment, the charger T has a bottom plate 1a, an inlet side plate 1b, a guide upper plate 1c connected to the inlet side plate 1b, and an outlet side plate 1d. Have. Further, in the present embodiment, the static elimination needle 6 sandwiched between the insulators 5a and 5b is integrally fixed to the outlet side plate 1d.

According to the present invention, the inlet side guide line holding member 2 and the outlet side guide line holding member 2 are provided in the vicinity of the outer side insulator 5b for the charge eliminating needle 6 fixed to the inlet side plate 1b of the shield plate 1 and the outlet side plate 1d. 3 are provided respectively.

In the present embodiment, the inlet side guide wire holding member 2 is a base 2a fixed to the bottom plate 1a of the shield plate 1 and a base 2a extending vertically from the base and close to the inlet side plate 1b of the shield plate 1. It has a support plate 2b arranged in parallel with each other, and an engaging portion 2c formed in a V shape at a predetermined interval from the support plate 2b. Similarly,
The outlet side guide wire holding member 3 has a support plate 3a fixed to the insulator 5b and an engaging portion 3b formed in a V shape at a predetermined interval from the support plate 3a. The outlet side guide wire holding member 3 is configured so that both ends 3c (FIG. 2) of the support plate 3a are fixed to both ends of the shield plate 1 and the charging wire 8 can be stretched. It is detachably attached to 9b by, for example, a screw (not shown).

The guide line engaging portions 2c and 3b of the inlet side and outlet side guide line holding members 2 and 3 preferably support the transfer material passing over the transfer charger T as shown in FIG. A guide wire 4 is arranged so as to extend from the inlet side guide wire holding member 2 toward the outlet side guide wire holding member 3 so that it can be guided.

With the above structure, one end of the guide wire 4 is fixed to the inlet side guide wire holding member 2 with, for example, a screw 14a, and then the inlet side engaging portion.
The other end of the guide wire 4 is fixed to the output side guide wire holding member 3 in this embodiment by, for example, a screw 14b, passing alternately through 2c and the outlet side engaging portion 3b.

According to the present embodiment, the guide wire 4 engaged with the engaging portions 2c and 3b does not easily come off the guide wire holding members 2 and 3, and the openings of the engaging portions 2c and 3b are elastic. It is closed by the guide wire separation preventing members 7a and 7b which are the body.

The functions of the guide wire separation preventing members 7a and 7b will be described in more detail. As can be understood from the above description, the guide wire detachment prevention members 7a and 7b include the guide wire 4, the guide wire detachment prevention members 7a and 7b, the engaging portions 2c and 3c, and the support plates 2b and 3a. The opening of the general engaging portion 2c is for making it easy to insert into the space created by the above and to make it difficult to disengage, and as shown in FIG. 3, which is an enlarged view seen from the direction of the arrow in FIG. The shape can cover the part. When the guide wire 4 is inserted, as understood from FIG. 4, the guide wire 4 is pushed through the guide wire separation preventing member 7a and moved upward, so that the guide wire 4 is inserted into the engaging portion 2. can do.

The guide wire separation preventing member 7b of the guide wire holding member 3 is shown in FIG. 5, but the structure and operation of the guide wire separation preventing member 7b are similar to those of the guide wire separation preventing member 7a.

In the charger T having the above configuration, when cleaning and replacing the shield plate 1, the transfer wire 8 and the charge elimination needle 6, the outlet side guide wire holding member 3 is removed from the support blocks 9a and 9b,
As shown in FIG. 1, the guide wire 4 is moved together with the outlet side guide wire holding member 3 in the direction of the arrow. As a result, the shield plate 1 and the charge elimination needle 6 are released, and cleaning and replacement work is performed. Such an operation is very easy as compared with the operation in the conventional charger.

Of course, in some cases, the same work can be performed by removing both or one of the support blocks 9a and 9b from the shield plate 1.

Next, when the cleaning and replacement work is completed, the guide wire holding member 3 is moved in the direction opposite to the arrow in FIG. 1 in the opposite direction to the above-described work for removing the guide wire holding member 3, and the support blocks 9a, 9b are moved. The guide wire holding member 3 is attached to. At this time, the guide wire 4 does not disengage from the engaging portions 2c, 3b of the respective guide wire holding members 3, and the guide wire 4 has a predetermined tension between the guide wire holding members 2, 3 in the initial state. Erected.

FIG. 6 shows a second embodiment of the present invention. According to this embodiment, the outlet side plate 1d of the shield plate 1 is formed separately from the other shield plate constituent members. The guide wire holding member 3 on the exit side is attached to the exit side shield plate 1d directly or through a member (not shown). The outlet side guide wire member 3 is fixed to the support blocks 9a and 9b.

The inlet-side guide wire holding member 2 is a base 2a fixed to the bottom plate 1a of the shield plate 1 and a support extending vertically from the base and arranged close to the inlet-side plate 1b of the shield plate 1. Board 2b
And an engaging portion 2c formed at a predetermined interval from the support plate 2b
Have and.

According to the present embodiment, the engaging portion for installing the guide wire 4
2c and 3b are formed in a loop shape and are arranged at predetermined intervals along the longitudinal direction of the charger.

According to this embodiment, the guide wire holding member 3 and the shield side plate 1d are moved integrally while the guide wires 4 are held by the guide wire holding members 2 and 3, and the shield plate, the charger 8 and the like are cleaned and Exchange will take place. According to the present embodiment, the opening of the shield plate 1 becomes large, and there is an advantage that the inside of the shield plate 1 can be cleaned and the charging wire and the like can be replaced more easily.

FIG. 7 shows still another embodiment of the present invention. In this embodiment, the guide wire holding members 2 and 3 are attached to the side plates 1b and 1d of the shield plate 1, respectively, and the supporting plates 2b and 3a attached to the shield plate 1 and the guide wires 4 are installed. The mating portions 2c and 3b are provided, and the engaging portions 2c and 3b are formed in a loop shape and are arranged at predetermined intervals along the longitudinal direction of the charger. The base 2a is separated from the support plate 2b of the guide wire holding member 2 and directly fixed to the shield plate 1.

According to the present embodiment, both guide line holding members 2 and 3 can be detached from the transfer charger integrally with the guide line 4, and can be detached in the direction perpendicular to the transfer material, enabling detachment work in a narrow space. Becomes

As described above, the transfer charger and the discharging needle are integrated in the first embodiment, and the transfer charger alone is described in the second and third embodiments. The charging device is not limited to the charging device shown in (1) above, and various charging devices, or a transfer charging device and a separation charging device integrated with each other can be used, and the same operational effects can be exhibited.

As described above, in the charger according to the present invention, the guide wire is held by the guide wire holding member and the charger is detachably provided in the guide wire. Therefore, the shield plate of the charger, the charging wire, When cleaning and replacing the static elimination needle, etc., it can be removed to a position that does not interfere with the cleaning and replacement work without unwinding the guide wire, and after the work, it can be easily specified without re-hooking the guide wire in sequence. It can be installed at the position and with an appropriate tension, which not only shortens the working time, but also prevents the guide wire from being stretched at the wrong position or with an inappropriate tension, thus making the transfer material a high potential body. It has the feature that accidents such as fires that occur due to contact or close proximity can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the charger according to the present invention. FIG. 2 is a plan view of the charger shown in FIG. FIG. 3 is a partial side view of the charger seen from the direction of the arrow in FIG. FIG. 4 is a cross-sectional view of the engaging portion of the inlet side guide wire holding member. FIG. 5 is a sectional view of an engaging portion of the outlet side guide wire holding member. 6 and 7 are sectional views of another embodiment of the charger according to the present invention. 1: Shield plate 2: Inlet side guide wire holding member 3: Outlet side guide wire holding member 4: Guide wire 6: Static elimination needles 7a, 7b: Guide wire separation prevention member 8: Discharge member (charged wire)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Naomasa Kimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Masanari Shirai 3-30-2 Shimomaruko, Ota-ku, Tokyo Kya Non-Incorporated (72) Inventor Tatsuya Shiratori 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiroyoshi Maruyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Masashi Ohashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) References: Development: Sho 64-13068 (JP, U): Development: Sho 60-74158 (JP, U)

Claims (1)

[Claims] 1. A charger having a discharge member, a shield plate provided with an opening and facing the discharge member, and a guide wire for guiding a sheet across the opening, the guide wire holding the guide wire. A charger having a holding member, wherein the guide wire holding member is detachably attached to the shield plate while holding the guide wire.