JPH0764479B2 - 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.

2. Description of the Related Art When performing double-sided copying in a copying machine having a double-sided copying machine, 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 Using the ejected sheets on the tray one by one, move the Jiyoga that has been retracted outward to the reference position and press the sheets from both sides to align and stack or eject the ejected sheets outward.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, the jiyoga can be easily brought to a desired position 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 center line.

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. As a result, the mechanism is complicated, the cost is high, the reliability is low, and the adjustment and the service have to be performed separately.

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 amount of displacement of the second Jiyoga with respect to the size,
Regardless of the paper size, it is set to be larger than a constant displacement amount of the first jioga, and is biased by the biasing means for biasing the first jyoga toward the center line side. A stopper for abutting the first jioga from the outside so as to position and hold the inner surface of the jiyoga at a position corresponding to the reference line, and an endless member which is driven by driving means and integrally movably fixed to the second jyoga. When the wire is fixed to the wire and is engaged only with the first jig yoga in a direction to push the wire against the biasing force of the biasing means, and the second jig yoga is in a predetermined outer position. , A hook member provided at a position for bringing the first jig yoga to a predetermined outer position.

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 switching claw 8 is held at the position indicated by the solid line so that the paper discharged by the paper discharge roller pair 7 is discharged to the paper discharge tray 13. 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.
The other second jig yoga is displaced from the outer side to a position spaced apart from the second width by the width of the paper, so that it is 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.
22b 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 29 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
A tension spring 30 is stretched between the support plate 25 and the support plate 25, and the support plate 25 is pulled toward the stopper 27. As shown in FIGS. Is positioned and held in contact with the right side surface of the stopper 27, and in this state, the stopper 27 is adjusted by the elongated hole 28 so that the inner surface of the vertical portion of the first jig yoga 21 is aligned with the reference line K.

On the other hand, the support plate 26 attached to the second jig yoga 22 is stretched over 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. The vertical part of the support plate 25 corresponds to the wire 34
Is provided with a notch through which the hook member 36 can freely pass. As shown in FIGS. 2 and 3, the hook member 36 is attached to the wire 34 so that when the second jig yoga 22 is in the predetermined outer position, the jig yoga 21 is in the predetermined outer position. The position is such that 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 section of the copying machine, the wire 34 is driven by the stopper motor 31, and the wires 34, 33
As shown in the figure, the first and second jig yoga 21, 22 are displaced to predetermined outer positions. In this state, the one-sided copying machine finished sheet is discharged to the tray 10, and the inclined roller 14 sets the reference side edge of the sheet as the first jig yoga and the front edge at the time of re-feeding as the touch plate 15 as described above.
Send to. When a predetermined number of sheets of paper are aligned and stacked at this position and the tilt roller 14 is lifted by the solenoid 16, the stepper motor 31 moves the wire 34 in the direction shown by the arrow as shown in FIGS. 4 and 5. , The second jig yoga 22 moves to the side edge position of the paper according to the paper size. This amount of movement is the first jiyoga 21 even with the largest size paper
Is set to be larger than the movement amount from the predetermined outside position to the reference position. Therefore, when the wire 34 moves so as to move the second jig yoga 22 to the side edge position of the reference position of the paper, the hook member 36 fixed to the wire 34 is fixed to the support plate of the first jig yoga 21 regardless of the paper size. 25 is Stoppa 27
The support plate 25
Inevitably, the stopper 27 is pressed against the stopper 27 by the urging force of the spring 30, and the first jig yoga is positioned and held in conformity with the sheet passing reference surface K.

The rotation amount of the stepper motor 31 is controlled by the paper size detected by the paper feeding unit, and the second jig yoga 22 is displaced from a predetermined outer position to a paper side edge position corresponding to the paper size, but the first jig yoga 21 is always Since it is displaced from the outer side position to the reference plane K and held at that position, both sides can be sandwiched and aligned by a jig yoga at a predetermined position according to the size of the fed paper.

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 both ends of the spring 30 are hooked to 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 and is attached to the main body of the copying machine so as to accurately match the sheet passing reference surface as shown in FIG. 7, the double-sided mechanism is an optional type and various one-sided surfaces having different reference surface positions are provided. Even when the same unit is used in common for the 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 drive system simultaneously displaces the Jiyoga on both sides by different amounts to precise positions,
Since it can be held in that position, the number of parts is small, assembly is easy and cost is reduced, and reliability is higher than when driving each jig yoga with a separate drive system. It is expensive, easy to adjust, and improves serviceability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic structure 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 lll-lll in FIG. Sectional view by line, No. 4
The figure is a plan view showing a state in which the jig yoga is applied to the position of the side edge of the paper at the reference position of the embodiment, and the fifth is V in FIG.
Fig. 6 is a sectional view taken along line -V, Fig. 6 is a sectional view showing the stopper mounting portion in detail, and Fig. 7 is a plan view showing the vicinity of the stopper provided in the copying machine body. 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 (4)

[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 single-sided reference copying machine in which the reference side edge is aligned with the reference position that matches the sheet passage reference line by the jogger, the change position of the second jogger with respect to the maximum paper size does not depend on the paper 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. A stopper for positioning and holding the position of the second jogger, and an endless wire which is fixed by the driving means so that the second jogger is integrally movable. The endless wire is fixed to the wire and is attached to the first jogger. A hook provided at a position that engages only in the direction of pushing outwardly against the biasing force of the biasing means and brings the first jogger to the predetermined outer position when the second jogger is in the predetermined outer position. A double-sided mechanism having a member. 2. The double-sided mechanism according to claim 1, wherein the position of the stopper is adjustable in the width direction. 3. An end of the urging means for urging the first jogger in the direction of moving the first jogger toward the center line of the tray, which is opposite to the jogger, is hooked on the stopper. The double-sided mechanism according to item 2 of the above. 4. The double-sided mechanism according to claim 1, wherein the stopper is fixedly mounted on the main body of the copying machine.