JPH02201461A - Recording paper carrying mechanism - Google Patents

Abstract

PURPOSE:To carry recording paper stably by providing guiding means so that a recording paper carrying path between photosensitive drums, which are side by side, are in a projecting form in the direction of the photosensitive drums and having the recording paper adhere to the carrying belt against the resistance received from behind the recording paper carrying direction. CONSTITUTION:Guiding rollers 60 and 60' push up the carrying belt 30 provided so that the recording paper carrying path between each photosensitive drum 12 and 12' is not in straight line with the recording paper carrying path, as is conventionally, but so that they are in a projecting form in the direction of the photosensitive drums 12 and 12'. That is, since the recording paper carrying path between the photosensitive drums 12 and 12' is in a projecting shape, even when resistance is received from behind the recording paper carrying direction, there is force 90 imposed in the direction to adhere with the carrying belt to the recording paper 50 by the combined force of carrying force 70 and back tension 80. Thus, the recording paper 50 is sufficiently adhered to the carrying belt 30, and the recording paper 50 can be stably carried on the carrying belt 30.

Description

[Detailed Description of the Invention] [Summary] Regarding the recording paper transport mechanism of a color image recording device, a recording paper transport mechanism that can stably transport the recording paper against resistance received from the rear in the recording paper transport direction is provided. It has a plurality of photosensitive drums on which toner images are individually formed,
In an electrophotographic image recording apparatus that sequentially transfers and records toner images formed on each photosensitive drum onto recording paper, a guide means is provided so that the recording paper conveyance path between adjacent photosensitive drums is convex toward the photosensitive drums. The recording paper is provided in such a manner that the recording paper is brought into close contact with the conveyance belt against the resistance received from the rear in the recording paper conveyance direction.

[Industrial application field]

The present invention relates to an electrophotographic image recording apparatus, and more particularly to a recording paper conveyance mechanism of a color image recording apparatus.

In recent years, electrophotographic printers that can achieve high speed and high resolution have become mainstream as printers used as output devices for electronic computers. Color printers that record color images have also come to be desired.

[Conventional technology]

As a color image recording device using electrophotography, the second
As shown in the figure, image recording means 10 (IOY) for each color of yellow, magenta, cyan, and black.

10M, 1. OC, 10BK) are arranged in series, and photosensitive drums 12 (12Y, 12M, 12C, 1
An apparatus has been proposed that records a color image by sequentially overlapping toner images formed on recording paper (28K) and transferring them onto recording paper.

The image recording means IO includes a charging device 13 as shown in FIG.
, latent image forming device 11, developing device 14, transfer device? Z15
, a cleaning device 16, and a photosensitive drum 12.

Additionally, 55 is a paper feeding mechanism, and 40 is a fixing device.

The recording paper 50 is electrostatically attracted to the conveyor belt 30 and conveyed, and the conveyor heald 30 is rotationally driven by pulleys 20 and 20 and is given sufficient tension. The transfer positioning of each toner image is performed by setting the time for starting toner image formation according to the distance between each transfer drum. A method has also been proposed in which each image recording means is provided with a sensor for detecting the position of the leading edge of the recording paper, and the start time of toner image formation is adjusted for each image recording means.

[Problems to be Solved by the Invention] In such a multi-drum color image recording device, the recording paper spans multiple photosensitive drums, so transfer is performed at multiple locations on the recording paper. Stable transport is a major challenge.

FIG. 3 is a diagram showing the problem. For example, when the rear side of the recording paper 50 is guided by a paper feeding mechanism (not shown), the recording paper 50 receives the back tension 80 due to the resistance of the paper feeding mechanism.

Also, the conveyor belt 3 is placed between the guide rollers 60 and 60''.
If the recording paper 50 is pulled backward by the back tension 80, the recording paper 50 electrostatically attracted to the conveyor belt 30 will be peeled off from the conveyor belt 30, causing a transfer position shift of the toner image. There is a fear. −
If the transfer position of a color or a plurality of color toner images is shifted, the colors become blurred, making it impossible to obtain a high-quality image.

Therefore, the recording paper 50 needs to be conveyed in close contact with the conveyor belt 30.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording paper transport mechanism that can stably transport recording paper against resistance received from the rear in the recording paper transport direction.

[Means to solve the problem]

In order to achieve the above object, a guide means such as a guide roller or a guide plate is provided so that the recording paper conveyance path between each photosensitive drum is convex in the direction of the photosensitive drum.

[Effect]

Since the recording paper transport path between the photosensitive drums is convex,
When the recording paper receives resistance from the rear in the conveyance direction, the recording paper also receives force in the direction in which it comes into close contact with the conveyance belt, allowing the recording paper to be conveyed in sufficient close contact with the conveyance belt.

〔Example〕

FIG. 1 is a configuration diagram of an embodiment of the present invention. In the figure, 12 and 12'' are photosensitive drums, 15 and 15'' are transfer devices, and 3
0 is a conveyor belt, 50 is a recording paper, and 60 and 60' are guide rollers. The guide rollers 60, 60'' push up the conveyor belt 30 so that the recording paper conveyance path between the photosensitive drums is not a straight line as in the past, but is convex in the direction of the photosensitive drums.

Since the recording paper transport path between the photosensitive drums is convex,
Even if resistance is received from the rear in the recording paper transport direction, a force 90 is applied to the recording paper 50 in the direction of bringing it into close contact with the transport belt 30 due to the combined force of the transport cuff 0 and the back tension 80. Therefore, the recording paper 50 is in close contact with the conveyance belt 30, and the conveyance belt 30 can stably convey the recording paper 50.

In the above embodiment, the recording paper conveyance path is forcibly made convex by the guide roller, but it is also possible to forcibly make the conveyance path convex by pressing a convex guide plate against the conveyance belt between the photosensitive drums. good.

〔Effect of the invention〕

As explained above, in the present invention, by actively making the recording paper conveyance path between the photosensitive drums convex, it is possible to obtain a good image without causing any misalignment of the recording paper, and it is possible to obtain a color image. This greatly contributes to improving the image quality of recording devices.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2 is a diagram explaining the concept of a color image recording apparatus, and FIG. 3 is a diagram explaining expected problems. In the figure, lO...image recording means 12...photosensitive drum 15...transfer device 20.20°...pulley 30...transport belt 50...recording paper 60.60'...guide Roller present invention Kazuo sewing v11a 6-ku spear 1 [21 questions shinρ, jI2I

Claims (1)

[Scope of Claims] A photosensitive drum having a plurality of photosensitive drums on which toner images are individually formed,
In an electrophotographic image recording apparatus that sequentially transfers and records toner images formed on each photosensitive drum onto recording paper, a guide means is provided so that a recording paper conveyance path between adjacent photosensitive drums is convex toward the photosensitive drums. What is claimed is: 1. A recording paper conveyance mechanism characterized in that the recording paper is provided in such a manner that the recording paper is brought into close contact with the conveyance belt against resistance received from the rear in the recording paper conveyance direction.