JPS58135057A - Sheets storage device - Google Patents

Abstract

PURPOSE:To improve alignment of sheets greatly by such a simple construction that a sheet's leading edge restrictive member and a sheet's trailing edge restrictive member are located in specific positions. CONSTITUTION:Each of the sheets 25 transported is exhausted with its leading edge ahead by a sheet exhaust means 21, and they are stacked in place with their trailing edges in line. In the sheets storage device, a sheet's leading edge restrictive member 23 to restrict the leading edges of the sheets 25 exhausted by an exhaust means 21 is located in such a position that the distance from the sheet exhaust means 21 is shorter than the length of sheets stored and that the distance from the trailing edge restrictive member 24 to put the trailing edges of the sheets in line is approx. equal to the length of sheets stored. Alignment of the sheets with each other can be thus much improved by such a simple constitution, where the leading and trailing edge restrictive members 23, 24 are located in the specific positions.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet stacking device for copying machines, printing machines, recording machines, and other machines having a mechanism for conveying sheets, accumulating them, and re-conveying them (hereinafter simply referred to as copying machines). A sheet stacking device K that improves the consistency of stacked sheets.
It is something to do.

Conventionally, in this type of sheet storage device, the tray for storing sheets is tilted from a horizontal plane, and the sheet slides on the tray due to its own weight, and is aligned by hitting a stop member. . However, in cases where the alignment of the edges is significantly impaired, a desirable result cannot be obtained unless a considerable inclination angle is formed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a novel sheet storage device that is improved in view of these drawbacks.

Another main object of the present invention is to provide a 1km sheet storage rack capable of fully combining the sheets to be stored.

That is, the main structure of the present invention that achieves the above object is a sheet stacking device that discharges a conveyed sheet from its leading edge side by a sheet discharging means, aligns and stacks the trailing edge side of the sheet. , a sheet leading edge regulating member for regulating the leading edge side of the sheet discharged from the sheet discharging means at a position where the distance from the sheet discharging means is shorter than the length of the sheet to be collected;
In this sheet storage device, the distance from the sheet rear end regulating member that aligns the rear end side of the sheet is approximately equal to the length of the sheet to be stored.

Hereinafter, specific embodiments of the present invention will be explained in detail according to the following. FIG. 1 is a partial cross-sectional view of a sheet conveying section of a copying machine to which the present invention is applied, and FIG. 2 is a partially enlarged perspective view #l of the same. In the figure, 1 is a photosensitive drum having a photosensitive member that can be rotated once in the direction of the arrow in the figure, and the sensing member has a photoconductive layer.
ix forming means, developing means, cleaning means for removing residual toner after transfer, etc. are not shown and omitted.

First, the transport path of the sheet material during first-side copying will be described. The sheet material conveyed in synchronization with the image on the photosensitive drum 1 is collected on the middle plate 5 in the lower cassette 2, and the middle plate 3 is pushed upward by the spring 4, and the separating claw 5
Therefore, the height of the 7-tooth material 6 is kept constant. The sheet material 6 is fed out one by one from the cassette and conveyed by a predetermined length by one rotation of a pick-up roller 7 having a partially cut-out cylinder. The fed-out sheet material is guided by fixed guide plates 8 and 9, and then passed through register rollers 11.
leading to. The photosensitive drum 1 is guided by the register roller 11 at a distance of %12·1'5. A separation belt 14 is attached to the end of the sensing body 1, and one end of the sheet material is separated from the photosensitive drum 1 and a potential is applied by discharge from a corona discharger 15 to separate the toner on the photosensitive drum 1. Transfer the air to the sheet material. The transfer sheet material is separated from the drum 1 by a bell 14, and is conveyed to the fixing means 17 by a conveying sheet means 16IIc having a suction mechanism. The sheet material passing through the fixing means 17 is fixed at the position of the flapper 18).
During 1#J copying, the lower paper ejection roller 2 is tightened by the guides 19 and 20 as shown by the spot tightening in Figure 1.
1 and discharged onto the lower tray 22. The sheet material 25 discharged onto the lower tray 22 is
5 and seat stopper 24 Lower tray 22 than K
It is aligned on .

The sheet alignment action by the abutting plate 2!1 and the sheet stocker horn 24 will be described in detail later.

#KK 2-sided copy temporary sheet, material transport route [
state After the first copy has been completed, the sheet material 25 stacked on the lower tray 22 is re-fed by the rotation of the re-feed roller 26. At this time, the minute roller 27 rotates in the direction of the arrow in order to prevent double feeding of sheet materials. The sheet material conveyed by the cough refeed roller 26 moves on the guide 29 via the conveyance roller 2B, and the leading edge of the sheet material &
It ends up just below Big Up Pura 7. Due to the rotation of the pickup roller 7, the sheet material that has reached just below the pickup roller is again guided by the fixed guide F plates 8 and 9 and reaches the register roller 11. Thereafter, the sheet material is conveyed by R171 during fixing in the same way as during the first image copying, and when the IE 2nd page copying is performed, the sheet material is guided by the guide 50°51 because the flannel 18 is in the position shown by the solid line in the figure. ,
The paper is discharged onto the upper tray 55 via the upper paper discharge roller 32t.

FIG. 2 shows a configuration in which a sheet leading end abutting member and a sheet stopper member of the present invention are arranged in a discharge device of an automatic double-sided copying machine having the above-mentioned conveyance path. The sheet end abutment member 26 is fixed on the lower tray 22. The loop-forming rod 35 is a rod with a triangular cross section that is fixed on the lower tray 22 at right angles to the sheet running direction. The sheet discharged onto the lower tray 22 is also rotated by the loop forming rod 35 (it has a loop in the direction perpendicular to the traveling direction).

The seat stoppers are arranged at two locations, 24m and 24b, and the rotary wheels 56 at 14m and 14b are supported by 1.

A tension spring 37 is attached to the seat stopper 241, and the seat stopper 241 is connected to the solenoid 59 via a string 58t. It has an appendage that looks like a sheet stock horn <-24b4M.

The sheet aligning action of the sheet leading end abutting member 23 and the sheet stopper 24 in the sheet discharge device having the above-described configuration will be explained with reference to cross-sectional views of FIGS. 3 to 6. The sheet 40 is discharged from the lower paper discharge roller 21tC to the lower tray 220.
Because there is a loop forming rod 35 (as shown in Fig. 3, while forming a loop at right angles to the direction of movement,
The sheet advances along the sheet 25 on which the sheet is placed, and the leading edge of the sheet abuts against the abutment member 23 as shown in FIG. The loop becomes larger until the trailing edge of the bale or sheet leaves the lower paper discharging roller 21, but once the trailing edge of the sheet separates from the lower paper discharging roller 21, the restoring force of the loop formed in the sheet causes The sheet moves until the rear end of the sheet touches the sheet stop flange member 24.

In this way, the sheets discharged onto the lower tray 22 are aligned by the abutting member 26 and the sheet stopper 24.

@6 Figure shows lower tray 22-, h, K aligned sheets 2
5 shows the state when refeeding paper. The upper sheets 25 are separated one by one and re-fed to the solenoid 69'.

In this embodiment, the sheet abutment member 26 is attached to the lower tray 22.
Although the sheet abutting member 23t is fixed at the top, by making it movable in the sheet advancing direction, the alignment effect described above can be obtained even if the sheet size used changes.

As explained above, according to the configuration of the present invention, the sheet alignment can be significantly improved with a simple configuration in which the sheet leading edge regulating member and the sheet trailing edge regulating member are arranged at predetermined positions.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the sheet conveying edge of a copying machine to which the present invention is applied, in which 21 is a paper ejection roller, 22 is a tray, 26 is an abutting plate (sheet leading edge regulating member), and 24 is a sheet stopper. (sheet rear end regulating member). Applicant Canon Co., Ltd.

Claims (2)

[Claims] (1) In a sheet stacking device that discharges a fed sheet from its leading edge side by a sheet discharging means and aligns and stacks the sheet with its rear end side, the sheet is discharged from the discharging means (7 - Place the sheet leading edge regulating member that regulates the leading edge of the sheet at a position where the distance from the sheet discharging means is shorter than the sheet length to be collected, and the distance from the sheet trailing edge regulating member that aligns the trailing edge i of the sheet is A sheet storage device wIL6 characterized in that fllVc is arranged approximately equal to the length of the sheets to be stored. (2) A sheet accumulating device according to the first JA recording ridge provided with a protrusion forming a loop on the sheet accumulating device.