JPH0452769Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a transfer charger in an electrostatic copying machine or printer.

Prior Art As shown in FIG. 4, a conventional transfer charger of this type has insulating end blocks 2, 3 at both ends of a casing 1 formed of a thin metal plate and having a U-shaped cross section.
The casing 1 is normally connected to earth, and a charge wire 4 is stretched inside the casing 1, and a DC high potential of several thousand volts is applied to the charge wire 4. The photoreceptor is moved to face the opening of the casing 1, and during this time it is charged by corona discharge from the charge wire 4. With this structure, the current from the charge wire 4 flows from three sides. Since the discharge also flows to the surrounding conductive material, the overall discharge efficiency to the opening side, that is, the photoreceptor, is low, so it is necessary to increase the transfer voltage, and as a result, more ozone is generated. . In addition, since the upper surface of the casing for transferring the transfer paper is open, in order to prevent the transfer paper from entering the casing 1, a nylon wire 5 is stretched in the transfer paper advancing direction of the casing 1 to prevent the transfer paper from entering. Although efforts are being made to prevent this, it is difficult to attach the nylon wire to the casing 1, and
The presence of this nylon wire had the disadvantage that cleaning the charge wire was difficult. In addition, as a means for preventing the transfer paper from entering, instead of using a nylon wire, as shown in FIG.
There is also a device in which the guide pawl 7 is provided so as to protrude above the opening of the casing 1, but this has the disadvantage that the transfer charger requires a large number of parts, making manufacturing complicated and expensive.

Purpose This invention aims to simplify manufacturing by integrally molding the transfer charger's casing, end block, and transfer paper guide plate from synthetic resin, and also to simplify manufacturing by integrally molding the transfer charger's casing, end block, and transfer paper guide plate. By providing the ground plate, it is possible to reduce the generation of ozone, obtain stable transfer performance, and ensure that the transfer paper is transported reliably.

Structure The transfer charger of the present invention has a casing body and an end block that are integrally molded from synthetic resin, each having a paper guide plate at the upper end of one side wall and a guide plate with claws at the upper end of the other side wall. A plurality of notches are formed in the directional casing corners, and a conductive member is installed inside the casing so that it can be grounded.
The present invention will be explained according to embodiments shown in the drawings.

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an explanatory view of the overall mechanism of an electrostatic copying machine using a transfer charger, FIG. 2 is a perspective view of the transfer charger, and FIG. The figure is an enlarged view of the transfer charger portion of FIG. 1, and FIGS. 4 and 5 are perspective views showing conventional examples of the transfer charger, respectively.

In an electrostatic copying machine, an image to be recorded on an electrostatically charged photoreceptor unit 11 is irradiated with an irradiation device 12 to form an electrostatic latent image on the surface of the photoreceptor unit 11, and a developing device 13 The toner is attached onto the latent image by the transfer charger 14.
The image is transferred onto the transfer paper sent in from 5, and fixed by the fixing device 16 to complete the transfer.

This transfer charger 14 is connected to the casing main body 2
0, end blocks 31 and 32, a charge wire 33, and a ground plate 38 which is a conductive member, and one side wall 2 of a casing body 20 having a U-shaped cross section and consisting of both side walls 21 and 22 and a bottom plate 23.
A transfer paper guide plate 25 with protrusions 24 provided at equal intervals is provided on the upper end of one side wall 22, and a casing 2 is provided on the upper end of the other side wall 22.
Guide plates 27 with claws are respectively provided with claws 26 provided at appropriate intervals so as to protrude into the 0 opening, and the casing corners formed by the side wall 22 and the bottom plate 23 are provided with guide plates 27 as shown in FIG. A plurality of notches 28 for ventilation are formed corresponding to the protruding positions of the claws 26. Therefore, when integrally molding the casing body 20, even if the claws 26 protrude, the mold can be removed using the notches 28, which simplifies the mold configuration.

At both ends of the casing body 20, positioning protrusions 29 and 30 for positioning the photoreceptor unit 11 are provided at the upper end thereof.
End blocks 31 and 32 equipped with
Charge wire 33 support rods 34, 35 are erected within the end blocks 31, 32.
A casing body 20 including the transfer paper guide plate 25 and the guide plate with claws 27 and the positioning protrusion 2
The end blocks 31 and 32 equipped with charge wire support rods 34 and 35 are integrally molded from synthetic resin.

A charge wire 3 is provided inside the casing body 20.
3 is stretched and the ground plate 38 of the conductive member
is installed inside, and one end of the wire 33 is connected to the support rod 3.
The ring body 37 is supported by a spring body 36 connected to the ring body 5, and a ring body 37 is attached to the other end, and this ring body 37 is supported through the support rod 34.

The ground plate 38 has the minimum required size, and as shown in FIG. 3, its upper end is locked to the edge of the transfer paper guide plate 25 provided at the upper end of the side wall of the casing main body 38, and the other end is attached to the notch in the casing corner. Part 2
It is installed inside the casing along the charge wire 25 in the longitudinal direction so as to reach zero.

The transfer charger 14 configured in this way is
A compression spring 4 whose bottom portion 23 is attached to a mounting plate 39
0, the photoconductor unit 11 is positioned by the positioning protrusions 29 and 30 and installed at a fixed position, and at the same time, the leaf spring 41, which is erected on the side of the compression spring 40 on the mounting plate 39, is inserted into the casing notch. It enters into the portion 28 and comes into contact with the end of the grounding plate 38 to be grounded.

The transfer paper fed from the paper feed section 15 is transferred to the transfer paper guide plate 2 on one side wall 21 of the transfer charger 14.
The transfer charger 14 is guided by the protrusion 24 on the top of the transfer charger 14.
and the photoreceptor unit 11, and before the edge of the paper falls into the casing 20, the casing 2
0 The transfer paper reaches a claw 26 provided inwardly extending from the top of the other side wall 22, and the transfer paper moves on the transfer charger guided by the claw 26 and the protrusion 24, and the image to be copied is transferred onto the transfer paper. Ru.

In this embodiment, the compression spring that presses the transfer charger and the leaf spring that grounds the ground plate are separate bodies, but either one may press the transfer charger and also serve as the ground wire. .

Effects In the present invention, the casing main body 20 and the end blocks 31, 32 are integrally molded from synthetic resin together with the guide claws 26 projecting above the opening of the casing main body, so manufacturing is simple and the number of parts is small, making it economical. At the same time, a minimum necessary ground plate made of a conductive material is installed inside the casing to reduce the generation of ozone, and ventilation from the notch 28 provided at the casing corner allows
Since the generated ozone is discharged to the outside, stable discharge is performed, the discharge efficiency is increased and transfer performance is improved, and grounding can be easily achieved through the notch 28.

This integral molding is possible because the guide claws 26 projecting above the opening of the casing main body are constructed so as to correspond to and overlap the notches 28 when viewed from the upper surface of the opening.

That is, during integral molding with synthetic resin, it is possible to move up and down the mold part that forms the mold surface for the lower surface of the guide claw 26 extending from the opening from below the notch 28 (notch hole). ,
2 claws with simple configuration (no slides etc. required)
It can be integrally molded with 6 protruding from the opening side.
Can be manufactured with high precision and at low cost.

Therefore, according to the present invention, the transfer paper can be reliably moved between the photoreceptor unit and the transfer charger by the claws provided on the paper guide plate 25 and the guide plate with claws 27, and the transfer paper can be moved onto the transfer paper reliably. A transfer charger that performs smooth transfer can be manufactured at low cost.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is an explanatory view of the overall mechanism of an electrostatic copying machine using a transfer charger, FIG. 2 is a perspective view of the transfer charger, and FIG. The figure is an enlarged view of the transfer charger portion of FIG. 1, and FIGS. 4 and 5 are perspective views showing conventional examples of the transfer charger, respectively. 20... Casing body, 21, 22... Side wall, 23... Bottom plate, 25... Paper guide plate, 26...
...claw, 27 ... guide plate with claw, 28 ... notch,
31, 32... End block, 33... Charge wire, 38... Conductive member (earth plate), 4
1...Spring plate.

Claims (1)

[Scope of utility model registration request] A paper guide plate is provided at the upper end of one side wall, a guide plate with a claw is provided at the upper end of the other side wall, and a guide plate with a claw is provided at the upper end of the other side wall, and the claw is provided at the longitudinal direction of the casing corner from the lower end of the other side wall to the bottom plate. The casing body and end block are integrally molded from synthetic resin, with cutouts cut out so that they overlap when viewed from above the casing opening, and a conductive member is cut out from the cutout inside the casing to the edge of the paper guide plate. A transfer charger configured internally so that it can be grounded through the section.