JPH01113769A - Method for arranging end parts of transfer sheet - Google Patents

Abstract

PURPOSE:To reliably execute paper resupply by arranging the leading edge of a transfer sheet in the paper passing direction of the transfer sheet, next arranging the side edge of the transfer sheet in a width direction and arranging the leading edge of the transfer sheet again. CONSTITUTION:A gathering roller 20 abuts on the upper surface of the fed-in transfer sheet for a necessary time and the leading edge of the transfer sheet is moved to a front abutting plate 25 side so as to perform a 1st arranging in the paper passing direction B. Next, a pair of joggers 30 and 30 moves in the paper width direction D from the position of the width of the transfer sheet + alpha to the position of abutting the side edge part of the transfer sheet so as to be arrange the width direction of the transfer sheet to be in a direction shown by an arrow D. In order to perform the arranging in the paper passing direction again, the gathering roller 20 abuts on the upper surface of the transfer sheet which is in a lower part from an upper position to be actuated in the direction of the front abutting plate 25 in a short time. Thus, the leading edge of the transfer sheet abuts on the front abutting plate 25, so that the transfer sheet is arranged in the paper passing direction and in the width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an intermediate stacking device such as a copying machine that is suitable for obtaining double-sided, composite copies, and is suitable for use as a conveying device for paper sheets that requires an intermediate stacking function. It relates to an applicable method for aligning the edges of paper sheets.

[Prior art]

Conventionally, in the intermediate stacking device of a copying machine that can perform double-sided copying, by aligning the paper edges with respect to the transfer paper fed onto the intermediate tray, the conveyance of the transfer paper when refeeding is ensured. I'm trying to get comfortable.

However, when aligning the edges of the transfer paper, first,
The alignment means in the paper passing direction is operated, and then the alignment means in the width direction is operated. In this case, the transfer paper that has been conveyed in a skewed manner is aligned with the paper in the paper passing direction by the operation of the alignment means in the width direction. The edges tend to be uneven, which can cause misalignment between the images of the first copy and second copy of the transfer paper that is re-fed, and may cause problems when re-feeding the paper. It has become.

[Purpose of the invention]

The present invention provides a method for stacking transfer sheets fed onto an intermediate tray by accurately aligning the paper edges in an intermediate stacking device such as a copying machine that enables double-sided and composite copying. It is an object of the present invention to provide a highly reliable double-sided/composite copying machine in which there is little deviation between the second copy and the second copy.

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention provides an intermediate stacking device such as a copying machine that is capable of stacking transfer paper after one-sided copying and refeeding the paper, in which transfer paper carried onto an intermediate tray is used. Align the leading edge of the transfer paper in the paper feeding direction, then align the side edge of the transfer paper in the width direction,
After that, the leading edge of the transfer paper is aligned again with respect to the paper passing direction.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a copying machine capable of double-sided copying to which the intermediate stacking device of the present invention is applied, and the operation of the copying machine when used in double-sided copy mode will be described. A document can be supplied onto the document table 1 from an automatic document feeder (not shown), and a copying operation is started by selecting the copy size and number of copies. At the same time that the optical system 2 scans the optical image of the original to form an image on the photoreceptor drum 3, a transfer paper 5 of the selected size is sent out from the paper feed cassette 4 by the paper feed roller 6, and is exposed to light in the registration roller rough. The image position on the photosensitive drum 3 is aligned with the transfer paper, and the image position on the photosensitive drum 3 is aligned.
The developed toner image is transferred onto transfer paper by a transfer charger 8. After the transfer, the transfer paper is separated from the photosensitive drum 3 by a separation charger 9, passes through a conveyor belt 10, a fixing roller 11, and a guide 12, and is placed on an intermediate tray 13 of an intermediate stacking device A, which is a feature of the present invention. It is sent by the discharge roller 14.

If the required number of copies is selected, Intermediate Tray 1
After the required number of transfer sheets are stored in 3, in order to obtain a copy on the back side of the transfer sheets, the transfer sheets are passed through a double-sided conveyance path 16 by a refeeding roller 15, and are moved to the image position of the photoreceptor drum 3 in the registration roller rough. The transfer paper is aligned and fed into the position of the transfer charger 8. As in the case of the front side of the transfer paper, the transfer paper on which the toner image of the photoreceptor drum 3 has been transferred by the transfer charger 8 to the back side of the transfer paper is separated from the photoreceptor drum 3 by the separation charger 9, and transferred to the conveyor belt 1.
0, the paper is discharged onto the paper discharge tray 17 via the fixing roller 11.

An embodiment of the intermediate stacking device A of the invention is shown in FIG.

The transfer paper conveyed through the guide 12 is transferred to the introduction roller 1.
By rotating in the direction of the arrow 8, the guide plate 31 is sent in the direction a, and the leading edge of the transfer paper is bitten by the discharge roller 14. A discharge sensor 19 for detecting the leading edge of the transfer paper is provided at the position of the discharge roller 14 and rotates, and is provided to align the leading edge of the transfer paper fed onto the intermediate tray 13 by turning on and off the discharge sensor 19. The position of the shifting roller 20 is switched between an operating position shown by a solid line and an elevated retracted position shown by a chain line through a solenoid (not shown).

The shifting roller 20 is attached to a shaft portion 20a at the end of an arm portion 22 that can rotate between the operating position and an elevated retracted position around a shaft portion 21 supported by machine frames on both sides (not shown). It is supported by a narrow roller that can touch the center of the transfer paper, and the shifting roller 20 is driven by a drive source (not shown) through a rotating shaft provided with a shaft portion 21 and a belt, as indicated by the arrow. Driven counterclockwise as shown.

A front abutment plate 25 is provided at the end of the intermediate tray 13 on the paper refeeding side, and the transfer paper 5b fed onto the intermediate tray 13 by the discharge roller 14 is brought into contact with the leading edge of the transfer paper by the front abutment roller 20. It is driven in the b direction so as to come into contact with the plate 25, and its tips are aligned. 5a is a transfer paper stored on the intermediate tray 13 with its leading edge aligned.

The intermediate tray 13 consists of a fixed tray part 13a and a rotatable tray part 13b, and the rotatable tray part 13b of the intermediate tray 13 is provided at a position in contact with the front cover plate 25.
is rotated counterclockwise around a shaft portion 26 provided on the side plate of the machine frame (not shown) from a position flush with the fixed tray portion 13a shown in FIG. It can be moved to a position where it can face the paper feed roller 15.

A paper pressing member 29 supported by a shaft portion 28 is disposed on the upper surface of the rotatable tray portion 13b close to the front backing plate 25 side, and a paper holding member 29 supported by the shaft portion 28 is arranged, and the paper holding member 29 is arranged so that the transfer paper is sent to the front backing plate 25 side by the rotation of the shifting roller 20. This prevents the paper from curving upward.

At both side edges of the intermediate tray 13, there are a pair of guides for guiding the transfer paper fed onto the intermediate tray 13 in the paper width direction, and for aligning the positions of the transfer paper received on the intermediate tray 13 in the paper width direction. A jogger 30.30 is provided, and when the transfer paper is received, the jogger 30.30 is placed at the paper size width + α position, and when aligning the transfer paper in the width direction, it moves to the transfer paper width and aligns the transfer paper in the width direction. The positions are aligned, and then the transfer paper is returned to the paper size width + α position in the receiving state. The driving of the joggers 30, 30 for alignment in the width direction is controlled by a stamping motor.

A method for aligning the edges of transfer paper in the intermediate stacking device of the present invention will be described.

The transfer paper that has been copied on one side of the transfer paper is sent from the introduction roller 18 in the direction a through the guide plate 31 to the discharge roller 14, and by the ON signal of the discharge sensor 19 provided at this position, the shifting roller 20 is moved. The transfer paper is driven to the upwardly rotated position shown by the dashed line separated from the intermediate tray 13 so that the transfer paper can be received onto the intermediate tray 13. In this state, the transfer paper 5b is fed onto the intermediate tray 13 by the discharge roller 14, and the rear end of the transfer paper is placed at the discharge sensor 1.
When the discharge sensor 19 is turned off by passing the position 9, the shifting roller 20 is turned off from the intermediate tray 13.
It is rotated from the raised position to the lowered position so as to be located on the upper surface of the transferred paper.

When this shifting roller 20 comes into contact with the upper surface of the transfer paper,
First, the transfer paper is loaded in the paper passing direction (direction B). The shifting roller 20 moves the upper surface of the transfer paper for the required time t, that is, the time required for the leading edge of the transfer paper to be conveyed to the front plate 25. is controlled so that it is located on the top surface of the transfer paper.

This necessary time t is necessary for the leading edge of any type of transfer paper to reach the front plate, even if the time required to bring the leading edge of the transfer paper to the front plate varies depending on the frictional resistance of the transfer paper, etc. The time is selected and set.

That is, as shown in FIG. 3(a), the transfer paper fed onto the intermediate tray 13 by the discharge roller 14 is fed between a pair of joggers 30 and 30 in a skewed state, and the transferred paper is The shifting roller 20 contacts the upper surface for the required time t1, moves the leading edge of the transfer paper toward the front plate 25, and aligns the paper in the first paper passing direction (direction B). This state is shown in FIG. 3(b), where the leading edge of the skewed transfer paper contacts the front plate 25 at an angle.

Required time 1. With the passage of time, the shifting roller 20 separates from the top surface of the transfer paper and retreats to the upper position, and then the - pair of joggers 3
0.30 moves in the paper width direction (D direction) from the paper width + α position of the transfer paper to the position where it touches the side edge of the transfer paper, and the width direction of the transfer paper moves in the direction of the arrow in Figure 3 (C). It can be arranged.

At this time, the skewed transfer paper is aligned in the width direction as shown in Figure 3 (c), but the leading edge of the transfer paper is
A space C is created between the paper sheet and the paper sheet 5, resulting in an uneven paper feeding direction.

In the present invention, after the alignment in the paper width direction is completed and the pair of joggers 30, 30 return to the paper width + α position where the transfer paper is received, the shifting roller 20 is moved to the upper position in order to align the paper in the paper passing direction again. Then, the transfer paper is moved to the solid line position in FIG. 2 where it comes into contact with the upper surface of the transfer paper below, and the leading edge of the transfer paper is moved toward the front plate for a short time t2. As a result, the leading edge of the transfer paper comes into contact with the front plate 25, and the transfer paper is aligned in the paper passing direction and the width direction, and is positioned on the intermediate tray 13, as shown in FIG. After the required time, the shifting roller 20 moves to the upper position in the transfer paper receiving state and waits for the next transfer paper to be inserted.

In the present invention, the skewed transfer paper fed onto the intermediate tray of the intermediate stacking device is aligned in the paper feeding direction before and after alignment in the width direction, so that the transfer paper is corrected for re-feeding. The transfer paper can be held in position, and the transfer paper sent out from the intermediate stacking device can be transported again in a correctly positioned state without jamming.

Although the embodiment of the present invention has been described as an intermediate stacking device for a double-sided copying machine, it can also be applied as an intermediate stacking device for a copying machine that combines images on the same surface of transfer paper. This provides a method suitable for accommodating the curled transfer paper in the correct position on the intermediate tray when refeeding the curled transfer paper.

〔Effect of the invention〕

Because the transfer image is formed on one side of the transfer paper, the transfer paper that is fed onto the intermediate tray of the intermediate stacking device has characteristics such as those with large curls or burrs that may hinder conveyance. However, the method of the present invention has the advantage that since the transfer paper is corrected and stored in the correct position on the intermediate tray, it can be fed correctly when refeeding, and the first and second copying It is possible to obtain high-quality copies with no misalignment, and moreover, it is possible to perform highly reliable paper refeeding with less occurrence of paper misfeeds or jams during paper refeeding.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a double-sided copying machine to which the present invention is applied, FIG. 2 is a sectional view of an intermediate stacking device to which the transfer paper edge alignment method of the present invention is applied, and FIGS. 3 (A) and (B). (C) and (D) are explanatory diagrams showing a method for aligning the edges of transfer paper according to the present invention. 13... Intermediate tray, 20... Collector roller, 25...
・Front plate, 30.30...jogger. Figure 2 (A) (8) Figure 3 (=)

Claims (1)

[Claims] In an intermediate stacking device such as a copying machine that is capable of stacking and refeeding transfer paper after one-sided copying, the leading edge of the transfer paper carried onto the intermediate tray is aligned with the paper feeding direction, and the next A transfer paper edge alignment method characterized by aligning the transfer paper side edge in the width direction and then aligning the transfer paper leading edge in the paper feeding direction again.