JP2803301B2 - Paper stack mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a paper stack mechanism, and more particularly, to a method in which an electrostatic latent image formed on a photoreceptor is transferred to a cut sheet by a transfer device and then cut. The present invention relates to a sheet stack mechanism for an electrophotographic apparatus that stacks sheets at a sheet discharge unit.

[Conventional technology]

Prior to the description of the present invention, the schematic structure of a conventional paper stack mechanism will be described with reference to FIG. 5. In FIG. 5, reference numeral 1 denotes a paper transport paddle, 6 denotes a drive shaft to which the paddle 1 is fixedly mounted, 10 Denotes a sheet tray, and 11 denotes sheets (cut sheets) stacked on the tray 10.

[Problems to be solved by the invention]

The schematic configuration of the conventional paper stack mechanism is as described above. However, in the related art, as described above, since the plurality of paper transport paddles 1 are fixedly attached to the drive shaft 6, the print density is low. If the stacking height of the sheets 11 stacked on the receiving table 10 is not uniform due to the printing position, and among the plurality of sheet transport paddles 1, those that do not touch the sheet 11 or those that are over-contacted And a stable paper conveyance force cannot be obtained, and as a result, there has been a problem that the paper is irregular or the paper is jammed.

An object of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
Even if the stacking height of the paper is not uniform due to the printing density and printing position, always keep the paper transport force constant,
An object of the present invention is to provide a sheet stacking mechanism capable of eliminating irregularity of sheets and paper jam.

[Means for solving the problem]

The object is to provide a sheet stacking mechanism for an electrophotographic recording apparatus in which an electrostatic latent image formed on a photoreceptor is transferred to a cut sheet by a transfer device, and the cut sheet is stacked at a sheet discharge unit. A mechanism, a plurality of drive pulleys attached to a drive shaft linked to the electric motor, a driven pulley connected to the drive pulley by a belt, and attached to be able to swing up and down, and attached to the driven pulley. This is achieved by a paper transport paddle and a leveling disk that is also attached to a driven pulley and that keeps the paper transport force of the paddle constant.

[Action]

However, according to the present invention having the above-described configuration, the sheet transport paddle is made to be swingable, so that the sheet transport paddle is always kept even if the pile height of the sheets on the receiving table is not uniform. By contacting the driven pulley with a leveling disk that keeps the paper transport force of the paddle constant, the amount of paper contact of the paddle can be kept constant.

〔Example〕

Hereinafter, the present invention will be described with reference to one embodiment of FIGS. 1 to 3. FIG. 1 is a perspective view showing the overall configuration of a sheet stacking mechanism according to the present invention, and FIG. FIG. 3 is a side view showing the positional relationship between the leveling disc 13 and the sheet 11 indicated by reference numeral 13; FIG. 3 is a sheet contacting amount and sheet conveying force of the sheet conveying paddle indicated by reference numeral 1 in FIGS. 1 and 2; FIG. 4 is an enlarged view for explaining the frictional resistance of FIG.

FIG. 4 is a characteristic diagram showing the relationship between the paper contact amount and the paper conveyance force.

In FIG. 1, a paper transport paddle 1 is attached to a driven shaft 2 and is connected to a driving shaft 6 via a driven pulley 3, a round belt 4, and a driving pulley 5. The drive shaft 6 is attached to a motor 9 via a pulley 7 and a belt 8. Therefore, the rotation of the electric motor 9 is transmitted to the sheet transport paddle 1 via the drive shaft 6, the drive pulley 5, and the driven pulley 4. The paper (cut sheet) 11 printed and discharged onto the receiving table 10 is conveyed by the paper conveying paddle 1, abuts against the front guide 12, and stops on the receiving table 10.

As shown in FIG. 2, the driven shaft 2 is provided with a leveling disk 13 for maintaining a constant conveying force of the sheet conveying paddle 1, and the leveling disk 13 is fixed by a spring 15 described later. , Is always in contact with the paper 11. Further, the paper contact amount 1 of the paper transport paddle 1 shown in FIG. 3 and the paper transport force F have a relationship as shown in FIG.

In FIG. 4, the area smaller than the hatched area is the sheet conveyance force F.
<F (paper frictional resistance shown in FIG. 3), and the paper transporting force F becomes insufficient. On the other hand, in an area larger than the hatched area in FIG. > F
Then, the sheet conveying force F becomes excessive, and the sheet 11 bends between the sheet conveying pandle 1 and the front guide 12, so that the sheet conveying force F is held at an appropriate size.
The diameter of the leveling disk 13 may be specified and the paper contact amount 1 of the paper transport paddle 1 may be set within the shaded area.

Returning to FIG. 1 and FIG.
Is mounted to be swingable about the axis of the drive shaft 6 via the driven pulley 4, the connecting plate 14, and the drive pulley 5. Also, in FIG.
Is suspended by the spring 15 and this spring 15
In the first embodiment, the connection plate 14 is tilted up and down according to the thickness of the sheet 11 so that the leveling disc 13 is always in contact with the sheet 11.

〔The invention's effect〕

The present invention is as described above. As is clear from the description of the illustrated embodiment, according to the present invention, the sheet transport paddle 1 is made to be swingable, so that the sheet 11 is deposited on the receiving table 10. Even if the height is uneven, the paper transport paddle 1
In addition, the driven pulley 3 is provided with a leveling disk 13 for keeping the paper transport force of the paddle 1 constant, so that the amount of paper contact of the paddle can be kept constant. .

In summary, according to the present invention, even when the stacking height of the paper 11 is not uniform due to the printing density and the printing position, the paper conveying force is always kept constant, and irregularity of the paper 11 and paper jam are eliminated. be able to.

[Brief description of the drawings]

FIGS. 1 to 3 show an embodiment of a paper stack for an electrophotographic apparatus according to the present invention, FIG. 1 is a perspective view showing the overall configuration, and FIG. 2 is shown by reference numeral 13 in FIG. FIG. 3 is a side view showing the positional relationship between the leveling disk and the sheet 11, and FIG.
2 and FIG. 2 are enlarged views for explaining the sheet contact amount and the sheet conveying force of the sheet conveying paddle denoted by reference numeral 1 and the frictional resistance between the sheets. FIG. 4 is a graph showing the relationship between the sheet contact amount and the sheet conveying force. FIG. 5 is a schematic front view showing the relationship between the paper transport paddle 1 and the paper 11 in the conventional paper stacker mechanism. 1 is a paper transport paddle, 2 is a driven shaft, 3 is a driven pulley,
4 is a round belt, 5 is a drive pulley, 6 is a drive shaft, 9 is an electric motor, 10 is a pedestal, 11 is a sheet (cut sheet), 13 is a leveling disk, and 14 is a connection plate.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 64-14767 (JP, U) Japanese Utility Model Utility Model Hei 1-58560 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B65H 31/36 B65H 9/00

Claims (1)

(57) [Claims] An electrophotographic apparatus stackable mechanism for transferring an electrostatic latent image formed on a photoreceptor to a cut sheet by a transfer device and stacking the cut sheet at a sheet discharge section, interlocking with an electric motor. A plurality of drive pulleys attached to the drive shaft to be driven, a driven pulley connected to the drive pulley by a belt, and attached to be swingable in the vertical direction, and a paper transport paddle attached to the driven pulley, And a leveling disk attached to the driven pulley and holding the paddle sheet conveying force constant.