JPS60106748A - Paper feeder for xerographic copier - Google Patents

Abstract

PURPOSE:To perform centering automatically thus to prevent rumples of paper by providing concave/convex sections engagable each other on the outercircumferences of paper carry roll and facing idler roll such that the idler roll is movable. CONSTITUTION:The outercircumference of recording paper carry roll 14 to be fixed on a shaft 13 is concaved. While the outercircumference of idler roll 15 corresponding to the roll 14 is convexed. The idler roll 15 is fixed movably in axial direction onto the shaft 16 through a copper system sintered bearing 17. Upon pressure contact of the lower portion of roll 15 against the roll 14, the roll 15 is moved automatically on the shaft 16 through convexity/concavity to be centered automatically in the center of roll 14. Consequently, rumpling of paper can be prevented when carrying/discharging.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application!!) The present invention relates to a paper feeding device for a recording paper feeding section of a large-sized copying machine or the like capable of copying up to A4 to A1 size.

(Prior Art) As shown in FIG. 1, a conventional electrophotographic copying machine cuts roll paper filled in a roll paper holding device 1 into a predetermined length with a cutter 2, and then cuts the cut paper into a predetermined length. Paper conveyance chain 3
The gripper 4 is gripped at the gripper home position, a toner image is transferred by the transfer section 6 of the photoreceptor 5, and the image is fixed by the fixing section T. -4, and the feed transformers 1 and 9 were housed on the g'''C'C external tray 1θ. When storing large sheets of paper in the storage tray 10Vc, the paper will not be stored unless both sides of the recording conveyance rolls 11 of the feedout transformers 1 and 9 are set high and the sheets are strongly supported and fed. However, there is a drawback that the recording paper may curl up in the middle of the tray 10 and cannot be accommodated, but as shown in FIG. In this case, the workability is very good when feeding the large sheet of paper, but in this case, the size of the press-fit of the idler roll 12 to the recording paper conveying roll 11 is misaligned, or the recording paper is Paper conveyance low/L
-'12 shaft is loose and idler roll 1
2 is carried by one end of the recording paper transport roll 11, there is a drawback that paper wrinkles may occur depending on the large paper η.

(Object of the Invention) The present invention has been made to eliminate the disadvantages of the 111 transport unit including the feed act transport unit in the conventional electrophotographic Xtlii copying machine, etc.
To provide a paper feeding device that smoothly transports large sheets of paper to At, smoothly stores the sheets in a storage tray, and does not cause paper wrinkles, etc. while transporting the sheets and ejecting the sheets from the storage tray. It is intended to.

(Structure of the Invention) For this purpose, the present invention provides a concave curved radius on the outer periphery of the recording paper transport roll fixed to the shaft, and provides a rounded radius on the outer periphery of the idler roll in contrast to this. is attached to the shaft so that it can move in the axial direction via a bearing on the circumference, and when it is pressed against the recording paper transport roll, the radius of the outer periphery of the idler roll and the recording paper transport roll are The center is automatically aligned by the radius of the outer periphery.

(Example) The present invention will now be described in detail based on an example shown in the drawings.

FIG. 3 is a partially sectional front view showing an embodiment of the paper feeding device of the present invention.

A recording paper conveying roll 14 fixed to the shaft 13 has a concave radius on its outer periphery. In response to this, the idler roll 15 has its outer periphery rounded and rounded, and the idler roll 15 has a number of S-movements in the axial direction with respect to the shaft 16 via a copper-based sintered l1ll bearing 11. I can sing.

The present invention is constructed as described above. And now,
When the lower part of the idler roll 150 is pressed against the recording bottle transport roll 14, the rounded rounded portion of the outer periphery of the idler roll 15 is automatically moved by the concave curved rounded portion of the outer periphery of the recording paper transport roll 14. Shirt number 6
The recording paper transport roll 14 is moved upward and aligned with the center of the recording paper transport roll 14, and this state is maintained thereafter.

(Effects of the Invention) The present invention is constructed and operates as described above, and the idler roll 15 is constructed so that it is always centered at the center of the recording paper transport roll 14. Therefore, even if several idler rolls 15 are arranged on the same axis as necessary in the feedout transport section, the idler rolls 15 are all pressed against the recording paper transport roll 14 at their centers and the paper transport system is Therefore, it is possible to avoid the occurrence of paper jams due to the quality of the recording paper, etc., and it has the effect of significantly improving the reliability of large electrophotographic copying machines. .

It should be noted that there is no reason why the present invention must be limited to the above-mentioned embodiment, and for example, the paper feed device shown in the above-mentioned embodiment may of course be snow-proofed in the paper transport section other than the feedout transport section. Needless to say, in this case, it is useful to prevent the recording paper from being wrinkled, skewed, or laterally shifted during conveyance.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a large electrophotographic copying machine that uses conventional roll paper, Figure 2 is a partially enlarged front view of the recording paper transport roll and idler roll of the paper transport device, and Figure 3 FIG. 2 is a partially enlarged front view of a recording paper transport roll and an idler roll section of the paper transport device of the present invention. In the figure, 13: e shaft, 14@9: recording paper conveyance roll, 15 wheel: e idler roll, 16mmmm shaft, 17: bearing. Figure 1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] Capable of copying large-sized paper In the recording paper conveyance unit of an electrophotographic copying machine, etc., a concave curved groove is provided on the outer periphery of the paper conveyance roll, and a round mountain-shaped groove is provided on the outer periphery of the idler roll. In addition to providing a radius, the idler roll is installed on the inner periphery of the shaft so as to be movable in the axial direction via a bearing, and when the idler roll is moved around the paper transport roll, A paper feeding device such as an electrophotographic copying machine whose signature feature is that the idler roll can be automatically aligned with the center of the paper transport roll by rounded portions on both outer peripheries. ,