JPH06115790A - Recording paper sheet carrier device - Google Patents

Abstract

PURPOSE:To improve stacking quality at a discharge part by correcting a curl occurring in a recording paper sheet while it is running through a curved part in a carrier passage during a conveyance process up to discharging the recording sheet to a discharge part. CONSTITUTION:This recording paper sheet carrier device, which is equipped with a curved part which reverses the conveyance direction of a recording paper sheet by curving the recording sheet into a roughly U-shape while it is being conveyed toward a discharge part in a carrier route, is provided with a carrier guide 15 of roughly V-shaped cross section where a position facing the roughly central part in a cross direction orthogonal to the conveyance direction of the recording sheet is bent mounted downstream of the curved part in the carrier route, and a recording sheet correcting body 17 which is brought into elastic contact with a carrier roller 16 for conveying the recording sheet to the bent part of the carrier guide 15 and the outer periphery of the carrier roller 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording paper conveying apparatus for correcting curl (warp / bend) generated on a recording paper on which printing or the like has been performed in the process of conveying to a discharge portion.

[0002]

2. Description of the Related Art In a conventional copying machine or printer, in order to reduce the size of the apparatus main body and the installation area, the recording paper is formed into a substantially U-shape in the conveying path for conveying the recording paper toward a discharge section. A method has been widely adopted in which a curved portion that bends and reverses the conveying direction of the recording paper is provided, and the recording paper is discharged to a discharge portion formed on the upper surface of the apparatus main body.

As shown in FIG. 4, the structure of the recording paper conveying device in such a printer is such that a pair of flat plate-shaped conveying guides 1 are opposed to each other in parallel so that the recording paper is conveyed. The transport guide 1 is provided with a discharge roller 2 and a discharge pinch roller 3 located in the left-right direction orthogonal to the recording paper transport direction.

[0004]

The recording paper heated at the time of fixing in a laser printer or printing at a thermal printer is apt to be curled (warped / curved) rolled along the conveying direction. Further, when the recording paper passes through the curved portion from the heated state in printing or the like, the degree of curling becomes even greater. Further, when roll paper is used as the recording paper, the curled state due to curling may remain. Then, the recording paper in the curled state has a poor stacking property in the discharging portion, and a jam occurs in the discharging portion or drops from the discharging portion.

[0005]

In a recording sheet conveying device, a curved portion is provided in a conveying path along which a recording sheet is conveyed toward a discharge portion, the curving portion being curved in a substantially U shape to reverse the conveying direction of the recording sheet. , A conveyance guide having a substantially V-shaped cross section, which is bent at a position facing a substantially central portion in a lateral width direction orthogonal to the conveyance direction of the recording paper, is provided on the downstream side of the curved portion in the conveyance path, A transport roller for transporting the recording paper and a recording paper corrector elastically contacting the outer peripheral surface of the transport roller are provided at the bent portion of the transport guide.

[0006]

When the recording paper passes through the curved portion in the conveying path, the recording paper is curled. However, when this recording paper is conveyed along a conveyance guide provided on the downstream side of the curved portion, it is bent and conveyed in a substantially V-shaped state following the shape of the conveyance guide, and its bent portion Is sandwiched between the transport roller and the recording paper straightening body and elastically pressed,
The curl of the recording paper is corrected, and the recording paper is ejected to the ejecting portion in a state of being bent into a substantially V shape following the shape of the conveyance guide or in a curl-corrected state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First of all, FIG. 2 shows the entire structure of a facsimile which incorporates an electrophotographic printer and employs a recording sheet conveying device according to the present invention. An original reading section 5 is provided inside a main body case 4. Further, a document table 6 for setting a document to be transmitted and a transmitted document discharge table 7 for discharging the transmitted document are provided on the upper surface of the main body case 4. Further, a paper feed cassette 9 accommodating the recording paper 8 is detachably attached to the lower side of the main body case 4, and an ejecting portion 10 for ejecting the recording paper 8 after printing is provided under the original table 6. Formed on the side. Further, in the main body case 4, a transport path 11 for transporting the recording paper 8 from the inside of the paper feed cassette 9 toward the discharge portion 10 is formed, and the photosensitive drum 12 and the photosensitive drum 12 are provided along the transport path 11. The fixing roller 13 and the like are provided. In the middle of the transport path 11, there is formed a curved portion 14 which is curved in a substantially U shape and which reverses the transport direction of the recording paper 8.

Next, in the portion of the conveying path 11 on the downstream side of the curved portion 14 which is substantially linear toward the discharging portion 10, the recording paper conveyed on the conveying path 11 is formed. A pair of conveyance guides 15 having a substantially V-shaped cross section, which is bent at a position facing the substantially central portion in the lateral width direction of 8, are provided so as to be parallel to each other in the vertical direction. The recording paper 8 is conveyed toward the discharge section 10 through a pair of the conveyance guides 15.
A conveying roller 16 for conveying the recording paper 8 is attached at a bent portion of the recording paper 5, and a conveying spring 17 as a recording paper corrector elastically abutting the outer peripheral surface of the conveying roller 16 is provided. Installed. The width of the conveying spring 17 is small, and the conveying spring 17 is in contact with the outer peripheral surface of the conveying roller 16 only at one point of the bent portion of the conveying guide 15.

In such a structure, the paper feed cassette 9
The recording paper 8 fed from the sheet is conveyed along the conveying path 11 toward the discharge section 10. During this conveying process, the transfer of the toner image from the photosensitive drum 12 and the fixing roller 13 are performed.
The fixing and so on are carried out. Then, the recording paper 8 fixed by the fixing roller 13 is ejected to the ejecting unit 10 after the conveying direction is reversed at the curving unit 14.

Here, the recording paper 8 which has been heated to a high temperature during fixing by the fixing roller 13 has a curved portion 14
At the time of reversing the carrying direction, the curl is curled along the carrying direction, so-called curl occurs. However, the recording paper 8 that has passed through the curved portion 14 is conveyed between a pair of conveyance guides 15 having a substantially V-shaped cross section, and moreover, the conveyance guide 1
When passing through the space 5, the transport roller 16 and the transport spring 17 located at the bent portion of the transport guide 15 are pressed. Therefore, the recording paper 8 is bent in a substantially V shape following the bending direction of the conveyance guide 15, the curl attached when passing through the bending portion 14 is corrected, and the recording paper 8 is discharged to the discharging portion 10 as shown in FIG. As shown, they are stacked in a substantially V-shaped bent state or in a flat state with curl corrected. Therefore, the stacking property of the recording paper 8 in the discharging unit 10 is improved, the occurrence of jam in the discharging unit 10 is prevented, and the discharged recording paper 8 is prevented from dropping from the discharging unit 10.

[0011]

As described above, according to the present invention, recording is provided in the conveying path along which the recording paper is conveyed toward the discharge portion, by providing the curved portion which is curved in a substantially U shape and reverses the conveying direction of the recording paper. In the paper transporting device, a transport guide having a substantially V-shaped cross section in which a position facing a substantially central portion in a lateral width direction orthogonal to the transport direction of the recording paper is bent is provided on the downstream side of the curved portion in the transport path. Since the conveyance roller for conveying the recording paper and the recording paper corrector elastically contacting the outer peripheral surface of the conveyance roller are provided in the bent portion of the conveyance guide, the recording paper passes through the curved portion. At this time, the recording paper is curled, but the recording paper is conveyed along a conveyance guide having a substantially V-shaped cross section, and the conveyance roller provided at the bent portion of the conveyance guide and the recording paper straightening member. Because it is transported while being pressed by The curl of the recording paper can be corrected, and the recording paper can be ejected to the ejection portion while being bent into a substantially V-shape following the shape of the conveyance guide. Therefore, the recording paper can be stacked at the ejection portion. Therefore, it is possible to prevent the jam of the recording paper at the discharge portion and the fall of the recording paper from the discharge portion.

[Brief description of drawings]

FIG. 1 is a front view showing a partial cross section of an embodiment of the present invention.

FIG. 2 is a side view showing the overall structure of the printer.

FIG. 3 is a front view showing the overall structure of the printer.

FIG. 4 is a front view showing a part of a conventional example in section.

[Explanation of symbols]

 8 Recording Paper 10 Discharging Section 11 Conveying Path 14 Curving Section 15 Conveying Guide 16 Conveying Roller 17 Recording Paper Correcting Body

Claims (1)

[Claims] 1. A recording paper conveying device, comprising a curved portion which is curved in a substantially U shape and which reverses the conveying direction of the recording paper, in a conveyance path along which the recording paper is conveyed toward a discharge portion. A conveyance guide having a substantially V-shaped cross section, which is bent at a position facing a substantially central portion in the lateral width direction orthogonal to the conveyance direction, is provided on the downstream side of the curved portion in the conveyance path, and the conveyance guide is bent. A recording paper transporting device, wherein a transporting roller for transporting the recording paper and a recording paper straightening body elastically abutting on an outer peripheral surface of the transporting roller are provided in a portion.