JPS63146049A - Recorder - Google Patents

Abstract

PURPOSE:To eliminate the need for a guide which inverts the conveyance direction of a material to which an image is to be transferred, to decrease the number of components, and to reduce the cost by providing a transfer device above an image carrier, using the reverse surface side of the object material as a transfer surface. CONSTITUTION:The material P to which an image is to be transferred is conveyed to between the image carrier and the transfer device 36 facing the image carrier 32 at an interval and the image on the image carrier 32 is transferred to the transfer surface of material P; and the transfer device 36 is provided above the image carrier 32 and the reverse surface side of the material P is used as the transfer surface. The image is transferred to the reverse side of the form P, so even when the form P is discharged straight, its page is in order, the need for the guide is eliminated, and the number of components is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a recording device that is applied, for example, as a laser printer.

(Prior Art) As a laser printer, the one shown in FIG. 4 is known. That is, in the figure, 1 is a main body of the apparatus, and a paper feed cassette 2 is set in the inner bottom of the main body 1 of the apparatus.

The paper P taken out from the paper feed cassette 2 is sent to the registration rollers 15a and 15b via the guide 3, and after being aligned there, the paper P is transferred via the guide 4 between the photosensitive drum 5 and the transfer charger 6. The toner image formed on the surface of the photosensitive drum 5 is transferred thereto. The paper P onto which this toner image has been transferred is passed through a paper guide 7 and a roller 8.
a and a press roller 8b, where the toner image is fixed.
a, 13b are further discharged onto a paper discharge tray 10 via a guide 9.

A charger 16, a developer 17, a transfer/peel charger 6, 18, a cleaner 19, and a static eliminator 20 are sequentially disposed around the photosensitive drum 5 along its rotational direction. The surface of the photosensitive drum 5 is uniformly charged and exposed to light to form an electrostatic latent image, and this electrostatic latent image is developed by a developing device 17. Further, the developer remaining on the photosensitive drum 5 during image transfer is removed by the cleaner 19, and then
The surface of the photosensitive drum 5 is neutralized by the static eliminator 20 .

(Problem to be Solved by the Invention) However, in the past, the transfer charger 6 was provided at the lower side of the photosensitive drum 5 to transfer the toner image to the upper surface of the paper P. If you eject the page, the page alignment will be in the opposite direction.

For this reason, a guide 9 is specially provided on the discharge side of the paper discharge rollers 13a and 13b, and this guide 9 inverts the paper P and stacks it on the paper discharge tray 10, so that the pages are aligned in a normal state. Ta. Therefore, there were problems in that the number of parts was large and the cost was high.

[Structure of the Invention (Means for Solving the Problems)] In order to solve the above problems, the present invention provides a transfer material between an image bearing member and a transfer device that faces the image bearing member at a distance. The transfer device is provided above the image carrier, and the lower surface side of the transfer material is used as the transfer surface. It is characterized by:

(Function) With the above means, it is possible to discharge the transferred materials in the same page order without providing a special guide.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 to 3.

Figures 2 and 3 show the external appearance of the device.
1 is the main body of the device. This device main body 21 has an upper housing 22
and a lower cylindrical body 23. An opening/closing door 24 is provided on the upper surface of the upper housing 22 so as to be openable and closable in the direction of the arrow around a fulcrum 25.

Further, an interface connector 26 for transmitting and receiving signals from an external computer is provided on one side of the lower housing 23, and a power cord 27, a power switch 28, and a ground terminal 29 are provided on the back of the lower housing 23. is installed.

Further, the lower housing 23 is provided with a space 30, into which a paper feed cassette 31 is detachably inserted in the direction of the arrow.

On the other hand, as shown in FIG. 1, inside the apparatus main body 21, a photosensitive drum 32 as an image carrier is provided rotatably in the direction of the arrow. , a charging charger 33, an exposure section 34, a developing device 35, a transfer charger 36, and a static eliminator 37 are arranged in this order.

Further, in the figure, reference numeral 39 denotes a polygon mirror which is rotationally driven by a drive motor 38, and this polygon mirror 39 scans information light 60 sent from an external device such as a personal computer or a word processor.

The light 60 reflected from the polygon mirror 39 is irradiated onto the photosensitive drum 32 via the lens 401, the first and second mirrors 41, 42, and the lens 43.

Further, the paper P as a transfer material stored in the paper feed cassette 31 is taken out one by one by the rotation of the paper feed roller 44. This taken out paper P is sent to registration rollers 46 via a guide 45. The paper P aligned by the registration rollers 46 is moved to the guide 47.
The photosensitive drum 32 is then sent via a feeding roller 48 to a conveying path H formed above the photosensitive drum 32. The conveyance path H includes a fixing device 51 including the transfer charger 36, a paper guide 54, a heat roller 49, and a press roller 50 along the conveyance direction of the paper P;
Further, a pair of paper ejection rollers 52a, 52b, a static elimination brush 55
are arranged in sequence. The paper ejection roller pair 52a, 52
A paper discharge tray 53 is provided on the discharge side of b.

During image formation, the surface of the photosensitive drum 32 is uniformly charged by the charger 33, and the information light 60 is scanned onto the charged upper surface of the photosensitive drum 32 by the rotation of the polygon mirror 38 to form an electrostatic latent image. is formed. This electrostatic latent image is visualized in the developing device 35 by supplying a developer. On the other hand, at this time, the paper P is taken out one by one from the paper feed cassette 31 by the rotation of the paper feed roller 44, and the paper P is taken out one by one from the paper feed cassette 31 by the rotation of the paper feed roller 44.
Sent to 6. After the paper P is aligned here, it is sent between the photosensitive drum 32 and the transfer charger 36 via the guide 47 and the feed roller 48, and the toner image is transferred to the lower surface thereof. Then, this paper P with the image transferred
is sent to the fixing device 51 while being guided by a paper guide 57, where the image is fixed, and then straight to the paper tray 5 via a pair of paper ejection rollers 52a and 52b.
The paper is ejected onto 3.

As mentioned above, since the image is transferred to the bottom side of the paper P, even if the paper P is ejected straight, the pages can be stacked in the same order, and there is no need for a guide as in the past. , the number of parts can be reduced.

[Effects of the Invention] As explained above, according to the present invention, there is no need for a guide for reversing the conveying direction of the transferred material, and the number of parts can be reduced and costs can be reduced. It is something.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention. FIG. 1 is a schematic configuration diagram showing a laser printer, and FIGS. 2 and 3 are perspective views of the laser printer as viewed from different directions. 4 are configuration diagrams showing a conventional example. 32... Photosensitive drum (image carrier), 36... Transfer device, P... Paper (transferred material). Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A transfer material is conveyed between an image carrier and a transfer device facing the image carrier at a distance, and the image on the image carrier is transferred to the transfer surface of the transfer material, wherein the transfer device is provided on the upper part of the image carrier, and a lower surface side of the transfer material is used as a transfer surface.