JPS60225171A - Conveyor for recording paper of copying machine - Google Patents

Abstract

PURPOSE:To enable conveyance of large-sized recording paper in the state of maintaining stably a transferred image to a fixing part by providing a guide member which prevents floating of the side end of the recording paper on one side of a conveying part which conveys the recording paper in the fixing part in a conveying part for the recording paper. CONSTITUTION:The guide member 32 is formed by bending a polyethylene terephthalate (PET) film or the elastic material having a smooth surface. The member is attached at the paek part 32 thereof to the bottom, etc. of a toner recovering box 25a of a cleaning device 25 positioned above a conveying part 21 and is so disposed that the downward inclining guide surface 32a thereof can contact with the side end face of the recording paper P. More specifically, the released side end face Pa of the recording paper is always restricted downward by a graded plane 31a when said face is going to float during conveyance and therefore the possibility of deforming and floating to a wave shape is made extremely small by providing the guide member 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording paper transport device to a fixing section in electrophotographic copying.

[Prior art] A small desk-type copying machine used for office purposes is based on the JIS
In addition to the A and B columns of recording paper according to regulations, there are copying machines that can make copies using small-sized recording paper, such as the size of a business card, by hand.

FIG. 1 shows an overview of the conveyance path of recording paper in such a copying machine.
The transfer timing of recording paper in the IS A row or B row, as well as small-sized recording paper such as business card size that is inserted from the manual feed port 4 and fed through the guide plate 5, is adjusted by the common registration roller 6. , the toner image is transferred to the peripheral surface of the photoreceptor drum 7 by the transfer pole 8, and then peeled off from the peripheral surface of the photoreceptor drum 70 by the separation pole 9, passed through the transport device 10, and then transferred to the fixing section 1.4. IC feeding is now available.

In the illustrated copying machine, all of the recording paper used is conveyed with its front side end surface as a reference, so that even in the conveyance section @10, the recording paper conveyed above the conveyance section 1 Regardless of its size, the paper is kept in contact with a transport reference member (not shown) provided on the front side of the transport section 11.

Therefore, the conveyance rollers 12 and 13 in the conveyance device 10
Both of these are configured to grip and convey only the non-image area at the front end of the recording paper.

Therefore, the conveyance force acts on only one side edge of each recording paper, and for small-sized recording paper such as the size of a business card, the thickness of the recording paper is FX. The flatness is maintained and the conveying section I+ is in close contact with the comb, and the comb is normally fed.However, in the case of large-sized recording paper such as B4, the opposite side edge deforms during conveyance, resulting in a waveform. 11-) and may be conveyed while floating significantly.

Moreover, the copying machine described above has an extremely dense internal mechanism in order to be miniaturized, and in particular, the above-mentioned transport section
11! In many cases, the toner collection box 15a, which occupies the bottom of the cleaning device 15, is arranged very close to each other, and as a result of the above-mentioned floating of the recording paper, its upper surface is placed in the toner collection box 15. There were many cases where the toner image was damaged by scratches on the bottom surface of the paper.

[Purpose of the invention]

The present invention provides a recording paper conveyance device for a copying machine that can stably convey a transferred image of a large recording paper used in a copying machine using one side reference conveyance to a fixing unit as described above. This is the purpose.

[Structure of the Invention] The present invention provides a guide member having a downwardly sloping plane on the side end face opposite to the conveyance reference end face of the recording paper that receives the toner image transfer and is conveyed to the fixing unit. This is because a guide member is provided on one side of the conveying section that conveys the recording paper in the fixing section in the conveyance path of the recording paper to prevent the side edges of the recording paper from floating up. This is achieved by the copying machine transport device tK, which is characterized by the following.

〔Example〕

Embodiments according to the present invention are shown in FIGS.
The figure shows the conveying device for conveying the recording paper to the fixing section as seen from the front of the copying machine, and Figure 3 shows the cross section taken along the arrow C1C. For the sake of simplicity, the conveyance reference member 31 and the recording paper P in the conveyed state are shown at 14 in FIG. It is omitted.

The recording paper P on which the tree-image has been transferred is fed from the direction of the arrow A to the conveying section 21 [and is transported to the conveying roller 22 and β
is carried out in the direction of arrow B by the fixing section (not shown).
VC transportation is now available.

The conveyance unit 21 carries a business card size note@paper conveyance surface 211.
1 and the conveyance surface 21b of larger recording paper, and these conveyance surfaces are conveyed by the conveyance roller 22゜B; ni r・1 child f7 (what 71t, its side end face in the same direction is 1
'1z transport -17Ii<14 copies, -RO τ1゛j It is correct that they are transported in contact with each other.

In addition, l"J i'13 j", 757; r+-ra? 2
and the rollers rotate counterclockwise according to the movement hK of the copying machine body: 11! , , :,'
:(' and the driven roller 221 that follows it) and tsu b grip and convey the non-image portion of the recording paper PO side end 1, damaging the toner image.

In contrast to the paper conveying device by Tsubakizo, the largest size recording paper used in the present invention is generally used in this type of copying machine, with the side edge of the 84-size recording paper facing downward. A guide member 32 having an inclined guide surface 32a to be regulated is provided.

The guide member, ze, is polyethylene tele 7 turret)
(PET) It is made of a 74 lumen or smooth elastic material and is bent and formed as shown in FIG. The downward inclined guide surface 328 is attached to the bottom etc.
As shown in the figure, it is arranged so that it can come into contact with the side end surface of the recording paper P.

That is, by providing the guide member 32, the released side end surface Pa of the recording paper is aligned with the slope plane, 3] a
When attempting to float during transportation, the guide is always downwardly restricted, so there is a very small possibility that the guide will deform into a wave shape and float. As the restraining force of the member 32 becomes stronger, it is unlikely that the toner image will float further and avoid scraping the bottom surface of the toner collection box 25m or the lower surface of other structures. As an example, in addition to the guard member 32 as shown in FIG.
For example, it may be a ring member that rotates in the direction of recording 1, or one or more guide members may be provided.
Of course, I will stay overnight.

[Effects of the Invention] According to the present invention, it is possible to convey the recording paper after the transfer to the fixing section without damaging the toner image, especially in a small-sized copying machine with a narrow conveyance path, thereby obtaining a good copy image appearance. It was decided that a copying machine recording paper conveying device capable of this would be realized.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing the progress of conveyance of recording paper in a copying machine. tP, Figure 2 is a front view of the recording paper conveying device according to the present invention [η. Figure 3 is a cross-sectional view. FIG. 4 is a perspective view of the guide member of the present invention.
...Conveyance surface z, z'+...Conveyance roller 22 R, 23a...Drive roller 22b, 23
b...Followed roller 5...Cleaning device 25+1...Toner collection box, -1...
...Conveyance base l.1.Member 32...Guide member 32a...Inclination guide surface 32 b...Top part......Note @Paper Pa, Pb. ...Side agent Patent attorney No 1) Parent-in-law

Claims (2)

[Claims] (1) Recording of copy i, characterized in that a guide member for preventing the side edge of the recording paper from floating is provided on one side of the conveyance unit that conveys the recording paper in the fixing section in the conveyance path of the recording paper. Paper conveyance device. (2) A recording paper transport reference member is provided on the opposite side of the guide portion of the transport unit, and the side edge of the recording paper that comes into sliding contact with the transport reference member is held and transported by rollers. A recording paper transport device for copying according to claim 1.