JPS58148152A - Sheet carriage apparatus with sheet aligning mechanism - Google Patents

Abstract

PURPOSE:To enable accurate alignment of a sheet when it is transferred by arranging a mobile member for a sheet carriage apparatus designed to retransfer the sheet with the tail thereof as leader once delivered with the tip thereof as leader so as to stop the tip thereof. CONSTITUTION:The tip of a sheet 40 discharged onto a tray 22 with a roll 21 pushes up a butting plate 23. The end of the sheet 25 brought into contact with the butting plate 23 is pushed back by own gravity or a returning force such as elasticity of the plate 23. This causes the sheet 25 to move on the tray 22 and have the tail thereof contacting a stopper 24 so that it is aligned with the position of the stopper 24. When the sheet 25 is refed, the stopper 24 is released through a solenoid 39 and a cord 38 to transfer it one at a time through rollers 26 and 27.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet conveying device for copying machines, printing machines, recording machines, and other machines equipped with sheet alignment mechanisms (hereinafter simply referred to as copying machines, etc.). A sheet conveying device with a sheet alignment mechanism that can improve
A.

Conventionally, in this type of sheet conveyance device, the method for aligning sheets in a sheet discharge device such as a urn copying machine is to tilt the discharge tray on which the sheets are stacked by a predetermined angle with respect to a horizontal plane, and then use the weight of the sheet to align the tray. The sheet was allowed to slide freely on the top, and the sheet was aligned by abutting against a suitable stop member. However, such alignment methods have the disadvantage that, for example, when static electricity is generated or in high humidity conditions, the alignment of the sheets is significantly impaired.

SUMMARY OF THE INVENTION In view of these drawbacks, it is an object of the present invention to provide a sheet conveying device having a novel sheet alignment mechanism that is improved.

Another object of the present invention is to provide a sheet conveyance device having a sheet alignment mechanism that can reliably align sheets in response to changes in the environment.

That is, the main structure of the present invention capable of achieving the above object is a sheet conveying device that refeeds a sheet conveyed from its leading edge in the sheet traveling direction from its trailing edge. After hitting a movable member in the forward direction of the sheet and stopping it, 1. Due to the restoring force of the movable member,
A sheet conveyor having a sheet alignment mechanism, characterized in that the sheet is advanced in a direction opposite to the forward direction and the rear end side of the sheet abuts against a stop member so that the rear end side is aligned. It is a device.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

Figure 5 is a partial sectional view of an embodiment in which the present invention is applied to an automatic double-sided copying machine. Figure 1 is a cross-sectional view showing the main part of the sheet material conveyance path of an automatic double-sided copying machine. In the figure, 1 is a photosensitive drum that rotates in the direction of the arrow. This drum is a well-known type having a photoconductive layer and Image forming means, developing means, and cleaning means for removing residual toner after transfer are not shown. First, the conveyance path of the sheet material during copying of the first side will be described.

The sheet material conveyed in synchronization with the photosensitive drum 1 is stored on a bottom plate 6 in a lower cassette 2. The bottom plate 6 is pushed upward by a spring 4, and the sheet material is moved by a separating claw 5. By making one revolution of the pickup roller 7, which has a notch at a constant height, the sheets are fed out one by one from the cassette and conveyed by a predetermined length. The fed sheet material is guided by fixed guide plates 8 and 9 and reaches register rollers 11. The sheet material whose tip abuts against this register roller 11 has its oblique feeding corrected, and is guided by guides 12 and 16 as the roller 11 rotates once and reaches the photoreceptor 1. A separation belt 14 is attached to the end WK of the photoreceptor 1, and one end of the sheet material is peeled off from the drum 1, and a potential is applied by discharge from the corona group [515] to remove the toner image on the drum 1. Transfer to sheet material. After the transfer, the sheet material is separated from the drum 1 by the bell 14 and conveyed to the fixing means 17 by a conveying belt means 16 having a suction mechanism.

Since the position of the seventh wrapper 18 is indicated by the dotted line in the figure when the first side is copied, the sheet material transferred to the fixing means 17 is conveyed to the lower paper ejection roller 21 by the guide 19.2°. The sheet material 25 placed on the lower tray is aligned on the lower tray 22 by an abutting plate 26 and a sheet stopper 24 that are movable in the direction in which the sheet travels.

The sheet alignment action by the acupuncture abutment plate 26 and the sheet stopper 24 will be described in detail later.

Next, the conveyance path of the sheet material during 12i1 copying will be described. After the first side is finished, the sheet material 25 stacked on the lower tray 22 is fed again by the rotation of the paper refeed roller 26. At this time, the separation roller 27 is rotating in the direction of the arrow in order to prevent double feeding 1 of the sheet materials. The sheet material conveyed by the paper refeed roller 26 is transported by the conveyance roller 2
The sheet material moves on the guide 29 through eight guides, and the leading edge of the sheet material reaches just below the pickup roller 7. Due to the rotation of the pick-up roller 7, the sheet material 7 that has advanced to just below the pick-up roller is again guided by the fixed guide plate 8-9 and reaches the register roller 11. Thereafter, the sheet material is transported to the fixing means 17 in the same way as when copying the first side, and when copying the second side, the flapper 18 is in the position shown by the solid line in the figure, so the sheet material is guided by the guides 30 and 31. The paper is then discharged onto the upper tray 63 via the upper paper discharge roller 321.

FIG. 2 shows a structure in which a movable abutment member and a sheet stopper member are arranged in the sheet traveling direction of the present invention applied to a paper discharge device of an automatic double-sided copying machine having the above-mentioned conveyance path.

The rotating shaft of the abutting plate 250 movable in the sheet advancing direction is supported by a holder 34, and the holder 34 is attached to the lower side of the upper tray 66. The loop forming rod 65 is a rod that is attached on the lower tray 22 and has a triangular cross section and has approximately the same length as the lower tray 22. The loop forming stick! 15 lower tray 2
All of the sheet materials discharged at No. 2 have loops in the traveling direction.

The sheet stoppers are arranged at two locations 24m and 24b, and the sheet stoppers 24a, 24b/) spindle shaft 66 is supported by the side plate of the sheet discharging device.

During copying of the first side, the sheet stopper 248 is attached with a tension spring 67 and is connected to the solenoid 39 via a string 68. Seat strapper 24b also has similar attachments.

The sheet aligning action of the abutting plate 23 and the sheet stocking horn 24, which are movable in the direction in which the sheet material travels, in the sheet discharging device configured as described above will be explained with reference to a sectional view of FIG. 6. The leading edge of the sheet 40 being discharged onto the lower tray 22 by the lower paper discharge roller 21 pushes up the abutment plate 23 due to the conveying force of the lower paper discharge roller 21 . When the sheet is separated from the lower paper discharge roller 21, the end of the sheet against the abutment plate 26 is pushed by the restoring force such as the own weight or elastic force of the abutment plate 26. At this time, the seat angle <-24 is located at the solid line position in the figure due to the tension spring 67. Therefore, the sheet whose leading end is pressed by the abutting plate 26 moves on the lower tray 22, and the trailing end of the sheet abuts against the sheet stopper. With the above operation, the edge of the sheet is moved to the sheet stopper 2.
Aligned to position 4.

The loop forming rod 65 attaches to the sheet discharged onto the lower tray.
Forms an upward loop to strengthen the back of the seat in the direction of travel,
This is to ensure that the restoring force of the plate 26 is transmitted to the rear end of the seat.

When refeeding the sheets 25 aligned and stacked on the lower tray 22, the solenoid 69 is turned on to rotate the sheet stopper 24 via the string 68 to the position indicated by the chain line in the figure. By releasing the stopper and rotating the paper refeed roller 269 and separation roller 27 in the direction of the arrow, the sheets 25 on the lower tray 22 are separated one by one and re-feeded.

Moreover, when the length of the sheet material to be conveyed changes, the holder 64 (FIG. 2) can be moved to match the length, so that it can be used for each sheet size.

As shown in FIG. 4, the abutting plate 26 is pulled by a spring 41 or the like to obtain a forced restoring force. By forcibly obtaining restoring force in this way, good alignment can be obtained even when the tray inclination angle is negative as shown in FIG.

Figure 5 shows a plate spring 42 attached to the tray 22 instead of the butt plate.
The same effect as the above example can be obtained with a simple configuration.

In Fig. 6, the abutment plate 4 slides smoothly along the direction of sheet travel. This example has an advantage in that the length of the sheets to be aligned in the compliance direction is not limited, unlike the previous embodiment and the above two examples.

As described above, according to the configuration of the present invention, the rear end side of the sheet being conveyed can be easily and accurately aligned simply by abutting the leading end side of the sheet against the movable member. Furthermore, this has the effect that the arrangement inclination angle of the sheet stacking tray can be arbitrarily set.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the main parts of a copying machine to which the present invention is applied, Figure 2 is a perspective view showing a part thereof, Figure 6 is a sectional view of Figure @2, Figures 4 and 5. is a sectional view showing another example, and FIG. 6 is a perspective view of another example. In the figure, 25 and 46 are movable abutting plates, 24 is a stopper, and 42 is a leaf spring. Applicant: Canon Co., Ltd. 7 '°T Agent: Gi Marushima -2,11-' Karasu

Claims (1)

[Scope of Claims] In a sheet conveying device in which a sheet is conveyed from its leading edge in the sheet advancing direction and then re-feeded from its trailing edge, the leading edge of the conveyed sheet is struck by a member movable in the sheet advancing direction. After hitting and stopping, the restoring force of the movable member causes the sheet to advance in the opposite direction to the forward direction, and the rear end side of the sheet hits the stop member to align the rear end side. A sorting and conveying device having a sheet aligning mechanism with a t% image.