JPS5897058A - Recording device - Google Patents

Abstract

PURPOSE:To obtain a good transferred picture stably, by providing a guiding member of a transferring member which is displaced in accordance with the displacement of a roll holding a beltlike recording material. CONSTITUTION:A recording device is provided with a mechanism correcting that a belt of a photoreceptor 1 goes to one side. For instance, when the belt goes to one side above a fixed range, this is detected optically and the belt is controlled so as to return the central part by displacing one end of a roll 2a upward or downward. A gap is generated between the belt 1 and a recording paper 8 by displacement of the roll 2a. A guiding member of the recording paper 8 displacing in accordance with the displacement of the roll 2 is disposed between the roll 2a and a transfer charger 6 in order to prevent this gap to be generated. By this way, as the recording material is stuck to the transferring member, a good transferred picture is obtained stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device that is improved so as to accurately transfer a toner image formed on a belt-shaped recording medium to a transfer member such as recording paper.

An indirect method in which a latent image is formed by circulating an endless belt-shaped recording medium, a developed material such as toner is attached to this latent image and developed, and then this developed image is further transferred to a transfer member such as recording paper. In a type recording device and near the transfer section, the belt-shaped recording body shifts to one side during movement, so-called belt deviation, which is corrected by displacing one end of the roller that holds the belt-shaped recording body upward or downward. However, if the transfer member does not follow the displacement of the roller, a gap will be created between the recording medium and the transfer member, resulting in blurring or unevenness in the transferred image.

Therefore, some methods have been developed to generate a Kt air attraction force between the transfer member and the recording medium by applying a charge by corona discharge to the transfer member, thereby bringing the transfer member into close contact with the recording medium. It is extremely difficult to obtain a state of close contact between the recording medium and the transfer member when using gauze process 1 where a large amount of charge cannot be applied, such as when using conditions that easily neutralize the toner charge. It is.

Conventionally, a guide member that guides the transfer member is attached integrally to a frame that further supports the roller that holds the recording medium, but this lacks the ability to follow the displacement of the roller. In particular, in the case of a type with a large amount of displacement, the provision of a guide member may even have the opposite effect.

Moreover, since it is an integral structure, it also has the disadvantage that it becomes a nuisance when replacing or maintaining the recording medium, for example.

In order to eliminate the drawbacks of the prior art described above, the present invention provides a guide member for the transfer member that can be displaced in accordance with the displacement of the roller, thereby making the adhesion of the transfer member to the recording medium more stable. It is an object of the present invention to provide a recording device in which a toner image is transferred with high precision, and in which the guide member is detachably attached to facilitate replacement and maintenance of a recording medium. Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 1 shows an example of a recording apparatus to which the present invention is applied, in which 1 is a photoreceptor belt, and feed rollers 2a+2
Circulating movement due to b. 3 is a charger for uniformly charging the photoreceptor belt 1, and 4 is an exposure means for irradiating the uniformly charged photoreceptor belt 1 with light corresponding to the original to form an electrostatic latent image on the photoreceptor. . Reference numeral 5 denotes a developing section that attaches toner to the electrostatic latent image and makes it visible; 6, a transfer chart/inner unit that transfers the toner image on the photoreceptor belt 1 onto recording paper 8 supplied from a paper cassette 7; . The transferred recording paper 8 is discharged through a fixing section (not shown), while the remaining charge on the photoreceptor belt 1 is removed by a charger 9. 10 is a cleaning section for removing residual toner, 11 is a roller 2a
, 2b, etc.

The recording apparatus to which the present invention is applied is equipped with a mechanism that corrects so-called belt deviation that gradually approaches one side of the roller when the photoreceptor belt 1 circulates. When the belt approaches the above position, this is optically detected and the belt is controlled to return to the center by displacing one end of the roller 2& upward or downward.

By the way, since the toner image on the belt 1 is transferred to the recording paper 8 near the displacing roller 2a, a gap is created between the belt 1 and the recording paper 8 due to the displacement of the roller 2a. Become. In order to prevent this, in the present invention, between the roller 2a- and the transfer charger 6,
A guide member for the recording paper 8 is provided which is displaced in accordance with the displacement of the roller 2a.

FIG. 2 shows a guide member according to an embodiment of the present invention. The main body of the guide member 12 has a notch 12a for avoiding the upper surface of the transfer charger 6, and locking parts 13 formed of a spring wire or the like are provided at both ends. FIG. 3 shows the guide member attached to the recording device. Note that FIG. 3(B) is a view seen from XX in FIG. 3(g).

One V-shaped part of the locking part 13 of the guide member 12 is engaged with the bearing 14 of the roller 2a, and the other V-shaped part is connected to the frame 11.
It is attached by engaging with the bin 15 provided in the.

Now, in order to correct the belt deviation, if one end of the roll 2a is displaced upward as shown in Fig. 4cA),
The side engaged with the bearing 14 is lifted. Conversely, when the roll 2a is displaced downward, the side engaged with the bearing 14 is displaced downward, as shown in FIG. 4(B). In either case, the distance between the roller 2a and the bottom of the guide member 12, that is, the part that guides the recording paper 8, is always constant, so that stable contact between the photoreceptor belt l and the recording paper 8 can be achieved. The toner image can be transferred with high precision. Further, since the guide member 12 is configured to be detachable, it can be removed as appropriate when replacing the belt or performing maintenance, making the work extremely easy.

FIG. 5 shows another embodiment of the attachment/detachment means, in which hook members 16 and 17 are provided which engage the bearing 14 of the roller 2a and the bottle 15 disposed on the frame 11 in a sandwiching manner, respectively. It is. Note that the attachment/detachment means in the present invention is 1
．． It is not limited to what has been explained in the examples.

FIG. 6 shows a guide member 18 of still another embodiment of the present invention.
a, 18b, as shown in Figure 2.
The guide portions are not provided over the entire width of the recording body, but are provided only at both ends in the width direction, and can be attached and detached individually. In addition to the above-mentioned types of attachment/detachment means, the attachment/detachment means may be attached to the frame 1 as shown by dotted lines to stabilize the attachment.
A locking portion may also be provided inside the frame 1 to sandwich the frame 11 from the inside and outside.

As explained above, according to one aspect of the present invention, the guide member that guides the transfer member such as the recording paper is displaced to follow the roller that is displaced to correct the belt deviation, and the interval between the guide members is always adjusted approximately. Since it can be maintained constant, the recording medium and the transfer member can be easily brought into close contact with each other, and as a result, a good transferred image can be stably obtained. Furthermore, since the guide member is configured to be detachable, there are advantages such as extremely easy replacement and maintenance of the recording medium.

In the embodiment, a photoreceptor belt is used as the recording medium, but an electrostatic recording belt made of dielectric or the like may be used.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a recording device to which the present invention is applied, and FIG. 2 is a perspective view of a guide member according to an embodiment of the present invention.
3 is a diagram showing a state in which the guide member shown in FIG. 2 is attached to a recording device, FIG. 4 is an explanatory diagram of the operation, and FIG. 5 is a diagram showing another embodiment of the guide member attachment/detachment means. FIG. 6 is a diagram showing how the guide member is attached in still another embodiment of the present invention. -1...Photoconductor health), 2a+ 2b
-...Roller, 6...Transfer guayaja, 8...Recording paper, 11...
... Frame body, 12.18a, 18b ...
・Kite member, 13...Locking part, 14
...-Bearing, I5... ...Bin, 16.
17...°・ Spring member. 1st I I 3 Figure 3 Figure 5

Claims (2)

[Claims] (1) An endless belt-shaped recording medium is circulated to form a latent image, the latent scratch compound is attached and developed, and then this developed image is transferred to a transfer member, Further, in the vicinity of the transfer section, there is provided a mechanism that corrects the belt shift to one side during movement of the belt-shaped recording body by displacing one end of the roller that holds the belt-shaped recording body upward or downward or the like. A recording apparatus, characterized in that a guide member for the transfer member is provided, the guide member being displaced in accordance with the displacement of the roller. (2) The recording device 0 according to claim 1, wherein the guide member is detachably attached.