JPH01219779A - Electrostatic charger - Google Patents

Abstract

PURPOSE:To facilitate the attachment and detachment of a guide wire and to facilitate the replacement and cleaning of a thermoelectric wire and destaticizing stylus by allowing at least one of guide wire holding member to be attached and detached freely. CONSTITUTION:A transfer electrostatic charger T has a U-shaped shield plate 1, and is equipped with the thermoelectric wire 8, destaticizing stylus 6, etc., and provided with entrance-side and exit-side guide wire holding members 2 and 3 which hold the guide wire 4 on both external sides of the shield plate 1. This member 3 is fitted detachably with a screw, etc., and when the member 3 is detached, the guide wire 4 is easily detached and the thermoelectric wire 8 and destaticizing stylus 6 are easily replaced and cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. The present invention generally relates to image forming apparatuses such as electrophotographic copying machines and electrostatic recording apparatuses, and particularly relates to a charger used in such image forming apparatuses. .

Conventionally, many chargers have been used in image forming apparatuses such as electrophotographic copying machines and electrostatic recording devices, and in particular, in transfer chargers and separation chargers, the chargers include: A transfer material such as transfer paper passes over an opening in a shield plate, which is usually U-shaped. At this time, the transfer material enters into the charger through the opening of the shield plate of the charger, approaches the discharge member such as the charging wire provided in the shield plate, or in the worst case, contacts and breaks the wire. To prevent this, a guide wire such as a nylon wire (Tegus wire) for guiding the transfer material is usually installed over the opening of the shield plate.

Furthermore, some transfer chargers are equipped with a static elimination needle in order to suitably separate the transfer material from an image bearing member such as a photoreceptor drum.
In order to prevent the transfer material from coming into contact with or approaching the static elimination needle, and to guide and support the transfer material, a guide wire is installed over the static elimination needle as well as over the opening of the shield plate.

On the other hand, in order to maintain transfer and separation performance, in the case of a transfer charger, the shield plate and charging wire must be kept clean.
In the case of a static elimination needle, the needle must be kept free from contamination with toner, etc. Therefore, the transfer charger and the static elimination needle must be cleaned and replaced at regular intervals.

However, in conventional transfer chargers, etc., the guide wire is wound around a shield plate or the like, or is fixedly wound around a notch formed in the shield plate, so that the guide wire does not become obstructed. Therefore, sufficient cleaning could not be done. In addition, when the guide wires are removed from the shield plate to replace or clean the charged wires, it is extremely difficult to re-hook the guide wires on the shield plate in the correct order and with the appropriate tension after the work. and required skill. In particular, since the order in which the guide lines are hung requires a specific hanging method in order to prevent the transfer material from entering the guide lines, errors are often made, and as a result, not only the guide lines cannot be fulfilled, but also It becomes an obstacle to the conveyance of the transfer material.
As a result, the transfer material remained in the vicinity of the charging wire, causing a fire.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a charger in which a guide wire can be easily attached and detached, and charging wires, and furthermore, charge removal needles can be easily replaced and cleaned.

The above-mentioned object is achieved by the charger according to the present invention. To summarize, the present invention provides a charger in which a guide wire is installed above an opening of a shield plate in which a discharge member is stretched, and in which a guide wire holding member for installing the guide wire is attached to the shield plate. The charger is arranged on both sides, and at least one of the guide wire holding members is detachably attached to the shield plate.

Support 1 Next, the charger according to the present invention will be explained in more detail with reference to the drawings.

An embodiment of the charger according to the present invention is shown in FIGS. 1 and 2. In this embodiment, the charger T includes a bottom plate 1a, an entrance side plate 1b, and a guide upper plate 1c connected to the entrance side plate 1b. ,
The shield plate 1 has a substantially U-shape and is open at the top. Further, in this embodiment, a static eliminating needle 6 sandwiched between insulators 5a and 5b is integrally fixed to the outlet side plate fa.

According to the present invention, an outer insulator 5 for the static elimination needle 6 fixed to the inlet side plate 1b and the outlet side plate 1d of the shield plate 1
An inlet side guide wire holding member 2 and an outlet side guide wire holding member 3 are provided adjacent to b.

In this embodiment, the entrance side guide wire holding member 2 has a base 2a fixed to the bottom plate 1a of the shield plate 1, and extends vertically from the base and is close to the entrance side plate 1b of the shield plate 1. The support plate 2b arranged as shown in FIG. It has a retaining portion 2C formed in a cross-section shape at a predetermined interval from b. Similarly, the outlet side guide wire holding member 3 has an insulator 5b
It has a support plate 3a fixedly fixed to the support plate 3a, and an engagement portion 3b formed in a cross-section shape at a predetermined interval from the support plate 3a. The outlet side guide wire holding member 3 has a support block 9 configured such that both ends 3c (FIG. 2) of the support plate 3a are fixed to both ends of the shield plate 1, and a charging wire 8 can be stretched thereon.
It is removably fixed to a and 9b using, for example, screws (not shown).

The guide wire engaging portions 2c and 3b of the inlet and outlet guide wire holding members 2.3 suitably support the transfer material passing over the transfer charger T, as shown in FIG. The guide wire 4 is disposed to extend from the inlet guide wire holding member 2 toward the outlet guide wire holding member 3 so as to be guided.

In the above configuration, 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 guide wire 4 is passed through the inlet side engaging part 2c and the outlet side engaging part 3b alternately. In this embodiment, the other end is fixed to the outlet side guide wire holding member 3 with, for example, a screw 14b.

According to this embodiment, the openings of each of the retaining parts 2c and 3b are made of elastic material so that the guide wire 4 engaged with the engaging parts 2c and 3b does not easily separate from the guide wire holding member 2.3. It is blocked by guide wire separation prevention members 7a and 7b, which are body parts.

The functions of the guide wire separation prevention members 7a and 7b will be explained in more detail. As understood from the above explanation, the guide wire separation prevention members 7a, 7b are formed by the guide wire separation prevention members 7a, 7b, the respective retaining portions 2C13b, and the support plates 2b, 3a. can be easily inserted into the space
Moreover, it is intended to make it difficult to separate, and as shown in FIG. 3, which is an enlarged view seen from the direction of the arrow in FIG. can. When inserting the guide wire 4, as shown in FIG. 4, the guide wire 4 is inserted into the engaging portion 2 by moving it upward while pressing the guide wire separation prevention member 7a. can do.

The guide wire detachment prevention member 7b of the guide wire holding member 3 is the fifth
Although illustrated in the figure, the structure and function of the guide wire separation prevention member 7b are also similar to the guide wire separation prevention member 7a.

In the charger T having the above configuration, when cleaning and replacing the shield plate 1, transfer wire 8, and static elimination needle 6, the outlet side guide wire holding member 3 is removed from the support blocks 9a and 9b and the , the guide wire 4 is moved in the direction of the arrow together with the outlet side guide wire holding member 3. As a result, the shield plate 1 and the static eliminating needle 6 are brought into a released state, and cleaning and replacement work can be performed. Such work is very easy compared to work with conventional chargers.

Of course, in some cases, it is possible to perform the same operation by removing either or both 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. Attach the guide wire holding member 3 to the guide wire holding member 3. At this time, the guide wire 4 is connected to the engaging portion 2C1 of each guide wire holding member 3.
3b, and the guide wire 4 is installed between both guide wire holding members 2.3 in the initial state with a predetermined tension.

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

The entrance side guide wire holding member 2 is attached to the bottom plate 1a of the shield plate l.
A base 2a fixed to the base 2a, and a support plate extending vertically from the base and disposed close to the entrance side plate 1b of the shield plate l. b, and an engaging portion 2C formed at a predetermined interval from the support plate 2b.

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

According to this embodiment, both guide wire holding members? , 3, while holding the guide wire 4, the guide wire holding member 3 and the shield side plate 1d are integrally moved to clean and replace the shield plate, the charged wire 8, etc. According to this embodiment, the shield plate This has the advantage that the opening of shield plate 1 becomes larger, making it easier to clean the inside of shield plate 1 and to replace charged wires and the like.

FIG. 7 shows still another embodiment of the present invention. In this embodiment, the guide wire holding members 2.3 are respectively attached to the side plates 1b and 1d of the shield plate 1; It has supporting plates 2b and 3a which are attached to each other, and an engaging part 2C13b for installing the guide wire 4, and the engaging part 2C13
b 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 is directly fixed to the shield plate l.

According to this embodiment, both guide wire holding members? , 3 can be detached from the transfer charger integrally with the guide wire 4, and can be detached in a direction perpendicular to the transfer material, making detachment work possible in a narrow space.

Above, the first embodiment has been described in which the transfer charger and the static elimination needle are integrated, and the second and third embodiments have been described in which the transfer charger is a single unit. It is not limited to the chargers shown in , but various chargers, or
It can also be used as a combination of a transfer charger and a separation charger, and similar effects can be achieved.

11 Blood Standing 1 As explained above, the charging device according to the present invention has a structure in which the guide wire is held in the guide wire holding member and is removably provided in the charging device, so that the shield plate of the charging device, the charging wire When cleaning or replacing the static elimination needle, etc., the guide wire can be removed to a position that does not interfere with the cleaning or replacement work without unraveling it, and after work, the guide wire can be easily reattached without having to re-hook it. The transfer material can be installed at a predetermined position and with an appropriate tension, which not only reduces work time but also prevents the guide wire from being stretched in the wrong position or with an inappropriate tension. It has the advantage of being able to prevent accidents such as fires that may occur due to contact with the body or residence in close proximity to the body.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a charger according to the present invention. FIG. 2 is a plan view of the charger shown in FIG. 1. 3 is a partial side view of the charger viewed from the direction of the arrow in FIG. 2. FIG. FIG. 4 is a sectional view of the retaining portion of the guide wire retaining member on the entrance side. FIG. 5 is a side view of the retaining portion of the outlet side guide wire holding member. 6 and 7 are cross-sectional views of other embodiments 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) Fig. 1 Fig. 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 a

Claims (1)

[Claims] 1) In a charger in which a guide wire is installed above an opening of a shield plate in which a discharge member is stretched, guide wire holding members for installing the guide wire are arranged on both sides of the shield plate. . A charger, wherein at least one guide wire holding member is detachably attached to a shield plate.