JPH0764478B2 - Double-sided mechanism of copier - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a double-sided mechanism of a copying machine in which a sheet passing standard is a one-side standard.

Prior art When performing double-sided copying with a copying machine having a double-sided copying function, the paper that has been copied on one side is discharged to an intermediate tray as a double-sided mechanism, and the discharged paper group is aligned at the paper-passing reference position of the copying machine. Then, after the original is turned over or replaced with the back original, the paper is re-fed from the intermediate tray to perform back copying to complete double-sided copying.

As a guide means at the time of aligning the paper to the reference position on the intermediate tray and feeding the paper, a pair of jig yoga which can be displaced between the positions of both side edges of the paper at the reference position and the positions outside thereof in the width direction is used. Using the ejected sheets on the tray one by one, move the Jiyoga that has been retracted outward to the reference position and press the sheets from both sides to align and stack or eject the ejected sheets outward. A method is widely used in which after abutting against one of the Jiyoga and stacking, the Jiyoga on both sides are moved to the reference position to align the sheet bundle at the reference position.

If the paper passing standard in the copier is the center standard, fix a pair of jig yogars on each side of the endless wires wrapped around pulleys on both sides of the tray, and drive the wires by a stepper motor. Then, by moving the jiyoga on both sides at the same time in the direction toward the center line or at the same time in the direction away from the centerline, the jiyoga can be easily held at a desired position.

However, if the paper passing standard inside the copier is one side standard,
The first gyojia on the reference side displaces a fixed distance between the reference line and a fixed position outside the reference line regardless of the paper size, while the second gyojia on the other side has a different displacement range depending on the paper size. Therefore, in the past, two Jiyoga were driven independently. Therefore, the mechanism becomes complicated, the cost becomes high, the reliability is lowered, and the adjustment and the service have to be separately performed, and the assembling and serviceability are poor.

Also, there is a reference side jig yoga that uses a cam to drive it because the displacement amount is constant, but in this case the reference line cannot be moved and the same intermediate tray is used for models with different reference lines. Can not do it. In addition, since a mechanism using a cam cannot take a large stroke of movement of Jiyoga, if a large sheet of skies comes in when receiving paper, it may hit the edge of Jiyoga and cause a stacking failure.

It is an object of the present invention to provide a double-sided mechanism having a simple structure and a high reliability, which eliminates the above-mentioned drawbacks of the conventional double-sided mechanism in which the sheet passing standard in the copying machine is one-side standard.

In order to achieve the above-mentioned object, the present invention provides a double-sided mechanism of a copying machine in which a first jig yoga is movably provided on both sides of a tray on the paper passage reference side and a second jig yoga is opposed thereto. The displacement amount of the second jyoga with respect to the paper size is set to be larger than the constant displacement amount of the first jyoga regardless of the paper size, and the biasing force is applied to move the first jyoga toward the center line side. Means, a stopper for abutting the first jigyoga urged by the urging means from the outside so as to position and hold the inside surface of the jigyoga at a position corresponding to the above-mentioned reference line, and the second means driven by the driving means.
An endless wire having a jiyoga fixed integrally movably and fixed to the wire, and engages with the first jiyoga only in a direction to push it outwards against the biasing force of the spring, And a hook member provided at a position for catching the first jioga at the predetermined outer position when the second jyoga is at the predetermined outer position, and detects that the paper is discharged to the tray. Means and the above-mentioned first jig yoga, which moves down and up at a predetermined timing by the detection signal, and displaces the discharged paper laterally from the reference line,
It is characterized in that it has an inclined roller for abutting against a contact plate provided at the carry-out end of the tray, and the position control of the drive means is performed by a paper size detection signal from the paper feeding section.

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

FIG. 1 is a diagram showing a schematic configuration of an example of an electrophotographic copying machine provided with a double-sided mechanism according to the present invention. Copier body 100
In the figure, the sheet on which the toner image is transferred from the sheet cassette 2 detachably provided on the right side through the sheet feed roller 3 and the registration roller 4 to the transfer portion around the photosensitive drum 1 is fixed by the fixing device 6 In the case of single-sided copying, the sheet is discharged by the discharge roller pair 7 to the discharge tray 13 by holding the switching claw 8 at the position shown by the solid line for single-sided copying. During double-sided copying, by holding the switching claw 8 at the position shown by the broken line in the figure, the single-sided copied paper discharged from the paper discharge roller pair 7 is automatically transferred by the option type attached to the bottom of the copying machine main body 100. The paper is discharged from the discharge roller 9 of the apparatus into the intermediate tray 10 and stacked with the copied side facing upward by the number of copies set in advance. After the originals are turned upside down or exchanged, the copy button is pressed for back side copying, and the sheets are provided one by one by the paper feeding means 11 on the bottom surface of the copying machine main body 100 through the horizontal transportation path 12 in the automatic transportation device 200. From the opening, it reaches the registration roller 4 through the relay roller pair 5 in the copying machine main body 100, stands by, and is fed to the transfer portion of the photosensitive drum 1 by the registration roller 4 at the feeding timing. The paper for which back side copying has been completed is ejected to the paper ejection tray 13 by the paper ejection roller 7.

As shown in FIG. 1, the intermediate tray 10 inclines forward and upward in the direction in which the paper is loaded, and the front half of the intermediate tray 10 has an automatic transport device 20.
Projected from 0 outside the machine. The paper discharged from the discharge roller 9 falls on the tray 10 by its own weight when the rear end leaves the discharge roller 9. When it is detected that the paper is discharged, the inclined roller 14 pivotally supported by the tip of the lever that swings up and down descends at a predetermined timing and comes into contact with the upper surface of the paper.
The trailing edge of the paper and the reference side edge are brought close to the backing plate 15 provided at the rear end of the tray (it becomes the front end at the time of re-feeding) and the reference side first jig yoga 21 which is retracted to the outside as described later, and the sheet is The solenoid 16 is moved up to the position and the tilted roller is raised. The stack of sheets aligned side by side by a predetermined distance from the reference position is aligned with the first reference position of the first yoga yoga.
By displacing the second second yoga paper sheet width from the other side to a position distant from the second second yoga paper sheet, the sheets are aligned at a predetermined reference position. Next, the paper push-up plate 23 at the end of the tray, which is the front end at the time of re-feeding, is pushed up by a cam or the like, and the top end of the stack of stacked sheets comes into pressure contact with the paper feed roller 11 to generate a paper feed signal. Accordingly, the sheets are fed one by one from the top.

Next, referring to FIGS. 2 and 3, the driving mechanism of the Jiyoga on both sides will be described.

The reference-side jeyoga 21 and the other jeyoga 22 are composed of a vertical part that abuts the side edges of the paper and a horizontal part that slides along the upper surface of the tray.
The reference numeral 22bb penetrates the guide groove 20 formed in the tray 24 and is fixed to the support plates 25 and 26 provided below the tray 24. A stopper 27 is fixed to the lower surface of the tray 24 by passing a screw through an elongated hole 28 extending in the width direction formed in the tray 24 as shown in detail in FIG. Stopper 27 and support plate 25
A tension spring 30 is stretched between the support plate 25 and the support plate 25, and the support plate 25 is drawn toward the stopper 27. As shown in FIGS. Positioned and held at the position where it abuts the right side surface of stopper 27, and in this state,
The stopper 27 is mounted by adjusting the slot 28 so that the inner surface of the vertical portion of the first jig yoga 21 coincides with the reference line K.

On the other hand, the support plate 26 attached to the second jig yoga 22 is wound around a motor pulley 32 driven by a stepper motor 31 provided on the side of the intermediate tray 24 and an intermediate pulley 33 provided on the opposite side. The endless wire 34 is fixed by a screw 35 so as to move integrally. Further, a hook member 36 that is engaged with the wire 34 only in the direction in which the support plate 25 of the first jig yoga 21 is pushed outward is fixed. In the hanging part of the support plate 25, the wire
A notch is provided so that 34 can pass freely and the hook member 36 cannot pass. As shown in FIGS. 2 and 3, the hook member 36 is attached to the wire 34 when the second jig yoga 22 is located at a predetermined outer side position, and the first jig yoga 21 is located at a predetermined outer side position. Thus, the support plate 1 is pushed and displaced.

The operation of this device will be described below.

When the double-sided mode is selected by the operation unit of the copying machine, the wire 34 is driven by the stepper motor 31, and the wires shown in FIGS.
As shown in the figure, the first and second jig yoga 21, 22 are displaced to predetermined outer positions. In this state, the one-side copied sheet is discharged to the tray 10, and the inclined roller 14 brings the reference side edge of the sheet toward the first jig yoga 21 and the front edge at the time of re-feeding to the contact plate 15, as described above. When a predetermined number of sheets of paper are aligned and stacked at this position and the tilt roller 14 is raised by the solenoid 16,
As shown in FIGS. 4 and 5, the stepper motor 31 moves the wire 34 in the direction indicated by the arrow, and the second jig yoga 22 is moved to the side edge position of the sheet according to the sheet size. This amount of movement is set to be larger than the amount of movement from the predetermined outside position of the first jig yoga 21 to the reference position even for the largest size paper. Therefore, when the wire 34 is moved to move the second jig yoga 22 to the paper side edge position of the reference position, the hook member 36 fixed to the wire 34 is irrespective of the paper size.
Is displaced by more than the amount of displacement required for the support plate 25 of the first jig yoga 21 to come into contact with the stopper 27, and the support plate 25 is inevitably pressed against the stopper 27 by the biasing force of the spring 30 so that the first jig yoga does not pass. The paper is positioned and held in conformity with the paper reference plane K.

The amount of rotation of the stepper motor 31 is controlled by the paper size detected by the paper feed unit 2 and displaces the second jig yoga 22 from a predetermined outer position to a paper side edge position corresponding to the paper size. Since it is constantly displaced from the outer side position to the reference plane K and held at that position, it can be sandwiched and aligned by the jig yoga on both sides at a predetermined position according to the size of the paper to be fed.

Since the stopper 27 can be fixed by adjusting the position within the range of the tray 24 by penetrating the elongated hole 28 as described above,
It can be easily shared by copiers with one-sided reference having different reference plane positions.

Further, since the spring 30 is hooked on both ends of the support plate 25 and the stopper 27, the support plate 25 should always be pressed against the stopper 27 with a predetermined pressing force even when the position of the stopper 27 is adjusted as described above. Therefore, the first jig yoga can be surely displaced to the reference position and held at that position.

If the stopper 27 is not fixed to the tray but is attached to the main body of the copying machine in such a manner as to accurately match the sheet passing reference surface as shown in FIG. 7, the double-sided mechanism becomes an option type and various kinds of different reference surface positions are provided. Even if the same unit is used in common for the single-sided reference model, the reference position is reliably determined and no adjustment is required. In this case, the spring 30 is hooked on the hooking member provided on the tray.

Effect As described above, according to the present invention, one driving system can simultaneously displace different amounts of jig yoga on both sides to exact positions and hold them at that position, so that the number of parts is small, It is effective in improving productivity and reducing costs,
In addition, the reliability is high, the adjustment is easy, and the serviceability is improved as compared with the case where each jig yoga is driven by a driving system separately.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an example of a copying machine having a double-sided mechanism of the present invention, FIG. 2 is a plan view showing an embodiment of the present invention, and FIG. 3 is a III-III line in FIG. Sectional view by, No. 4
FIG. 5 is a plan view showing a state in which the jig yoga is placed at the position of the side edge of the paper at the reference position of the embodiment, FIG. 5 is a sectional view taken along the line VV in FIG. 4, and FIG. 6 is a stopper attaching portion. FIG. 7 is a cross-sectional view showing in detail, and FIG. 7 is a plan view showing the vicinity of a case where a stopper is provided in the main body of the copying machine. 2 …… Paper feed unit 10 …… Intermediate tray unit (double-sided mechanism) 14 …… Inclined roller, 21 …… First gyojia, 22 …… Second jiyoga, 24 …… Tray 25,26 …… Support plate, 27 …… Stopper 28 …… Long hole, 29 …… Set screw 30 …… Spring (biasing means), 31 …… Stepper motor (driving means) 32,33 …… Pulley, 34 …… Endless wire 36 …… Hook member, K ...... Passing reference line (side)

Claims (1)

[Claims] 1. A first jogger which is displaceable between a paper passing reference line in a copying machine and a predetermined position outside thereof in the width direction, and a paper width corresponding to the paper size which is opposed to the first jogger and which corresponds to the paper size. The tray is provided with a second jogger which is displaceable between the open position and a predetermined position outside the open position, and the one-side copied sheets of various sizes ejected on the tray are paired with the above-mentioned pair of sheets. In the double-sided mechanism of a one-sided reference copying machine in which the reference side edge is aligned at the reference position where the jogger aligns with the above-mentioned sheet passing reference line, the displacement amount of the second jogger with respect to the maximum sheet size does not depend on the sheet size. A biasing means that is set to be larger than a constant displacement amount of the first jogger and biases the first jogger in the direction of moving the first jogger to the center line side, and the first jogger biased by the biasing means from the outer side. Make sure that the inner surface of the jogger is aligned with the reference line above. To the position where the second jogger is integrally moved so that the second jogger is integrally movable and fixed to the stopper. The first jogger is fixed to the endless wire. Engage only in the direction of pushing outward against the urging force of
A hook member provided at a position for bringing the first jogger to the predetermined outer position when the second jogger is at the predetermined outer position, and means for detecting that the paper is discharged to the tray. , The first jogger, which descends at a predetermined timing according to the detection signal, and displaces the ejected sheet laterally from the reference line, and an inclined roller that abuts against a contact plate provided at the carry-out end of the tray. A double-sided mechanism having a sheet size detection signal from a sheet feeding unit for controlling the position of the driving unit.