JPH0546040Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a charger involved in the relationship between a photosensitive pair and a transfer paper in an image forming apparatus such as an electronic copying machine.

BACKGROUND ART In an electronic copying machine, a separation charger 1 transfers a developed image formed on the surface of a photoreceptor drum 23 onto a transfer paper using a transfer charger 2, and then removes the transfer paper from a drum 23, as shown in FIG. It is used for separation and has a charge wire 3 for projecting an alternating electric field toward the drum side,
A shield case 5 having a U-shaped cross section is provided around it. In addition, in FIG. 4, 6 is the drum 23.
A conveyor belt is used to guide the transfer paper separated from the transfer paper to a downstream fixing section, 7 is a main charging section, 8 is an exposure section, 9 is a developing section, and 10 is a cleaning section.
They are arranged around the drum 23, respectively.

By the way, in the separation charger 1, there is a risk that the separated transfer paper may enter the shield case 5, so in order to prevent this, a guide is provided on the opening side of the shield case 5 to smoothly guide the transfer paper downstream. It is common to provide a member.

As such a guide member, the Utility Model 59-
There are those that are integrally molded from resin as shown in No. 181456, and those that are in the form of a film as disclosed in Japanese Utility Model Application Publication No. 120459/1983.
In the former case, the guide member can be swung open and closed about the oscillation axis, and the opening of the shield case can be closed or opened. On the other hand, in the latter type, a guide member is press-fitted between a pair of opposing wall portions, and is detachable.

In addition, there is also one in which a film-shaped guide member is fixedly attached to both of a pair of walls.

Problems to be Solved by the Invention However, since the device of Utility Model Application No. 59-181456 can be opened and closed, it is convenient for cleaning the internal charge wire, but it has the disadvantage of being expensive. Moreover, since the swing axis is located between the separation charger and the conveyor belt,
Problems may occur if the distance between the separation unit and the conveyor belt is large and the transfer paper is small in size, such as a business card.

On the other hand, the method of Utility Model Application Publication No. 60-120459 has great cost advantages, but when using thick transfer paper, the guide member may move and come off, and if your hand touches the guide member during jamming, There is a risk that this guide member will come off. Incidentally, a film-like guide member with both ends adhered has a disadvantage in that workability is extremely poor when cleaning the charge wire inside the shield case.

The object of the present invention is to provide a charger devised to eliminate the above problems.

Means for Solving the Problems In order to achieve the above object, the present invention provides a charger in which a guide member is provided on the opening side of the shield case in order to prevent the transfer paper from entering the shield case in which the charge wire is housed. , one end of an elastic film-shaped guide member is attached to one of a pair of walls of the shield case running in a direction along the charge wire;
The other end of the guide member can be detachably fixed to the other wall and also detachably fixed to the one wall.

Function According to this configuration, in a normal state, the guide member is in the form of a bridge between the pair of wall portions of the shield case, and preferably guides the transfer paper toward the conveyance belt. Since one end of the guide member is adhered and fixed, the entire guide member will not move or come off even if external force is applied. When cleaning the charge wire, the opening of the shield case is opened by removing the other end of the guide member from the other end and removably temporarily fixing it to the one wall to which one end of the guide member is attached and fixed. be done.

Examples Examples shown in the drawings will be described below. 1st
In the figure, 1 is a separation charger, and 2 is a transfer charger, both of which have charge wires 3, 4 (see FIG. 2) disposed within shield cases 5, 11 each having a U-shaped cross section. Reference numeral 12 indicates a front housing, and reference numeral 13 indicates a rear housing. In these housings, means (not shown) for fixing the charge wire are provided, and one or both of the housings are provided with a means (not shown) for applying tension to the charge wire. There is also a built-in spring means for this purpose. 14 is a pre-transfer guide formed integrally with the shield case 11.

The first and second parts make up the U-shaped shield case.
Of the wall portions 15 and 16, the second wall portion 16 is common to the transfer charger 2 and the separation charger 1, and also functions as a partition wall.

Now, the separation charger 1 is provided with a plurality of film-shaped guide members 17. One end 18 of these guide members 17 is fixed to the first wall 15 using double-sided adhesive tape, and the other end 19 is fixed to the first wall 15 using double-sided adhesive tape. is fitted into a rectangular first hole 20 provided in the opposing second wall portion 16, and a portion thereof protrudes toward the transfer charger 2 side. The guide member 17 is made of, for example, polyester film, has sufficient elasticity, and can be bent to a large extent. In a normal state, the guide member 17 is in the form of a bridge between the first and second walls 15 and 16 as shown in FIG. 1, and the transfer paper passing over it enters the inside of the shield case 5. I won't allow that. However, when cleaning the internal charge wire 3,
As shown by the dotted line in FIG. 2, the other end 19 of each guide member 17 is removed from the second wall 16 and its tip is fitted into the second hole 21 provided in the first wall 15. When all the guide members are arranged in this manner, the opening of the shield case 5 is opened and the charge wire 3 can be easily cleaned.

In addition, when the height of the first wall part 15 is lower than that of the second wall part 16, the guide member 1 is lowered as shown in FIG.
The other end of 7 can be secured over the first wall portion 15. Therefore, in this case, the first wall portion 1
It is not necessary to provide the second hole 21 in 5.

In addition to the embodiments described above, various other embodiments are possible without departing from the spirit of the present invention.

Effects of the Invention According to the present invention, the guide member can be formed of an inexpensive material such as polyester film, which is advantageous in terms of cost, and there is no risk of it coming off even if external force is applied.

Furthermore, when cleaning the charge wire, the opening of the shield case can be easily opened by removably fixing the other end of the guide member to the wall to which one end of the guide member is attached. Furthermore, when the present invention is applied to a separation charger, the distance between the separation charger and the conveyor belt can be shortened, so even small-sized transfer paper can be smoothly separated and conveyed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a separation charger embodying the present invention, and FIG. 2 is a plan view. FIG. 3 is a perspective view of a main part showing a state in which the other end of the guide member is locked to open the opening of the shield case. FIG. 4 is a schematic diagram showing the installation state of the separation charger and its related parts. DESCRIPTION OF SYMBOLS 1... Separation charger, 3... Charge wire, 5... Shield case, 15... First wall part (one wall part), 16... Second wall part (other wall part),
17... Guide member, 18... One end of the guide member, 19... Other end of the guide member, 20... First hole, 21... Second hole.

Claims (4)

[Scope of utility model registration request] (1) In a charger in which a guide member is provided on the opening side of the shield case to prevent transfer paper from entering the shield case that houses a charge wire therein, a pair of wall portions of the shield case run in a direction along the charge wire. One end of an elastic film-like guide member is affixed to one wall of the guide member, and the other end of the guide member can be removably fixed to the other wall, and can also be removably attached to the one wall. A charger characterized by having a structure that allows it to be fixed. (2) The charger according to claim 1, wherein the other wall portion is formed with a first hole into which the other end of the guide member is fitted. (3) A utility model characterized in that the one wall portion is provided with a second hole into which the other end of the guide member is fitted, at a position away from a location to which the one end of the guide member is attached. Charger according to registered claim 1. (4) The charger according to claim 1, wherein one of the pair of walls is a partition wall between an adjacent charger.