JPH0258174B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a copying machine capable of transferring images on both sides of a sheet, in which sheets of paper with one side of the sheet transferred are aligned and stored, and one The present invention relates to an image forming apparatus that can be taken out individually.

(Prior Art) FIG. 1 is a cross-sectional view of a conventional copying machine capable of transferring images on both sides of paper, and the general structure of this copying machine will be explained. FIG. 1 shows a copying machine main body 2 with a document table 1 fixed on the top, a plurality of cassettes 3 and 4 containing paper P to be inserted into the main body 2 and fed, and the main body 2. It is comprised of a removable tray 5 on which the ejected paper P is collected after copying is completed. An illumination lamp 6 and a first mirror 7 are provided below the document table 1, and scan the document (not shown) placed on the document table 1. Mirror 9 moves horizontally while keeping the optical path length constant.

At this time, the illumination lamp 6, first mirror 7, second mirror 8, and third mirror 9 move integrally in synchronization with the rotation of the photosensitive drum 12.
That is, when the original P placed on the original platen 1 is irradiated by the illumination lamp 6, the reflected light forms an image on the surface of the photosensitive drum 12 via the condenser lens 10 and the fourth mirror 11. be done. A charger 13 is disposed on the outer periphery of the photosensitive drum 12,
Since the surface of the photosensitive drum 12 is charged, a portion of the surface of the photosensitive drum 12 is erased by the focused reflected light to form a latent image. This latent image is sent to a developing device 14 disposed around the outer periphery of the photosensitive drum 12 and developed, thereby obtaining a visible image using toner.

On the other hand, the uppermost sheet P is taken out from, for example, the lower cassette 4 inserted into one side of the copying machine main body 2 by the rotation of the delivery roller 16.
When the developed toner image is guided to the lower part of the photosensitive drum 12 by a pair of registration rollers 17, the developed toner image is transferred onto the paper P by a transfer charger 18 disposed around the outer periphery of the photosensitive drum 12. .

The paper P thus transferred is conveyed by a conveying means including a conveying roller 19 and a guide member 20 and sent to a fixing device 21 . and,
The paper P that has been fixed is discharged to a tray 5 attached to one side of the copying machine main body 2 and is accumulated, while the photosensitive drum 12 that has been transferred passes through a charger 22 for neutralizing static electricity disposed on the outer periphery. Thereafter, the cleaning device 22 removes residual toner and cleans the toner, and the toner is returned to the charger 13 to be charged again.

Similarly to the case of the lower cassette 4, copies of the paper P stored in the cassette 3 are taken out one by one by the rotation of the feed roller 15, copied, and then discharged to the tray 5. and can be accumulated.

Therefore, the paper P supplied to the lower cassette 4
is sent to the main unit side to complete one-sided copying,
After being stacked on the tray 5, copies can be made on both sides of the paper P by manually taking it out from the tray 5 and supplying it to the upper cassette 3. Next, FIG. 2 shows an example of a copying machine equipped with an automatic double-sided copying unit (hereinafter abbreviated as AD unit), and the configuration of this copying machine will be explained. However, since the same reference numerals as in FIG. 1 indicate the same parts, the explanation will be omitted. In FIG. 2, above the lower cassette 4 is a fuser 21.
An AD unit 30 is provided which temporarily accumulates the paper P sent from the paper P and then takes it out again. That is, on the discharge side of the paper P fixed by the fixing device 21, a rotatable guide selector 31 is provided which guides the paper P to the AD unit 30 via the paper discharge roller 24. the above
The AD unit 30 is provided close to a pair of feed rollers 32 that feed the paper P guided by the guide selector 31 into the cassette 34, and below the feed rollers 32, and temporarily holds the paper P in a stacked state. A cassette 34 having a swingable push-up plate 33 that is stacked and one end of which is pushed up toward the feed roller 32 side; 33, and a pair of delivery rollers 35 for feeding out the paper P taken out from the paper P.

Note that guide bodies 25 and 26 are arranged between the exits of the lower cassette 4 and the AD cassette 30 and the registration roller 17 to guide the sheet P taken out.

Next, the basic principle based on the above configuration will be explained. First, among the uncopied sheets P stored in the lower set 4, the topmost sheet P is taken out by the rotation of the feed roller 16, and the guide body 25
Push the registration roller 1 in the direction of arrow A while being guided by
Sent to 7. Next, when the paper P is fed along the outer peripheral surface of the photosensitive drum 12 by the rotation of the registration rollers 17, the toner image formed on the surface of the photosensitive drum 12 is transferred to one side of the paper P, and then the conveyance roller 19 The image is fed into the fixing device 21 in the direction of arrow B via a conveying means consisting of a guide member 20 and a guide member 20. Here, when double-sided copying is performed on a plurality of sheets of paper P stored in the lower cassette 4, the guide selector 31 is set by rotating to the position shown by the solid line. The paper P fixed by the device 21 is conveyed in the direction of arrow C from the paper discharge roller 24 while being guided by the guide selector 31. Then, the paper P is transferred to the feed roller 32
The paper P is fed in the direction of the arrow D by the rotation of the paper P and placed on the push-up plate 33 that forms a part of the AD unit 34, and the same operation is repeated for the required number of subsequent paper sheets P to accumulate them in a stacked state. It will be done. (See FIGS. 3a and 3b.) In this way, when a plurality of sheets of paper P having been copied on one side are accumulated on the push-up plate 33, the push-up plate 33 reaches its final position as shown in FIG. 3c. Since the upper sheet P is pushed up to the position where it comes into contact with the feed roller 32, the single-sided copy sheets P accumulated on the push-up plate 33 are moved into the cassette 34 shown in the direction of arrow E by the rotation of the feed roller 32. It is taken out to the exit side.

Thereupon, the paper P is held between the feed rollers 35 and guided by the guide body 26 while being fed again to the registration rollers 17 in the direction of arrow F. Then, due to the rotation of the registration roller 17, the paper P
is sent along the outer peripheral surface of the photosensitive drum 12, and the toner image formed on the surface of the photosensitive drum 12 is transferred to the paper P.
transferred to the other side. That is, toner images are transferred to both sides of the paper P. In this way, the paper P on which both sides have been transferred is again sent to the fixing device 21 in the direction of arrow B via the conveyance means, as described above.

At this time, since the guide selector 31 is rotated to the position shown by the dotted line and is on standby, the other side of the paper P is fixed by the fixing device 21, and the so-called double-sided fixed paper P passes the paper ejection roller 24. pass through the gate, and while being guided by the guide selector 31
The paper sheets are sent to the tray 5 in the direction of the paper and accumulated, and the double-sided copying is completed.

Next, FIGS. 3a to 3c show a state in which sheets P, one side of which has been copied, are stacked on the push-up plate 33. That is, the paper P guided from the fixing device 21 to the AD unit 34 via the guide selector 31 is sent onto the push-up plate 33 by the feed roller 32. (See FIG. 3a) Next, when the paper P is separated from the feed roller 32, the paper P falls onto the push-up plate 33;
A pushing plate 37 loosely fitted to the rear of the peeling claw 3 is fixed close to the tip side of the pushing plate 33.
Press in 6 directions. That is, since the push plate 37 is adapted to move horizontally from position A to position B as shown in FIG. Here, multiple sheets of paper P
When making double-sided copies, the horizontal movement of the push plate 37 is repeated for the number of copies. When a predetermined number of sheets of paper P are stacked on the push-up plate 33, the push-up plate 33 is raised by a push-up mechanism (not shown), and the paper P on the push-up plate 33 is pushed up by the feed roller 33.
The paper P is pressed against the feed roller 3.
2, the sheets are taken out one by one onto the photosensitive drum 12 on the main body side for double-sided copying. However, since the paper P fed onto the push-up plate 33 is generally misaligned and is placed in the state shown by the dashed line in FIG. If the paper sheets P stacked on the push-up plate 33 cannot be collected in a satisfactory condition even if they are pressed to There was a risk that one side of the tip of the P would not be locked and it would tilt when being fed out.

(Problems to be Solved by the Invention) The present invention solves the problem that even if the conventional device presses the sheets against the peeling claw side using the push plate, the paper cannot be collected in a satisfactory state, and the sheets are accumulated on the push plate. This was done to solve the problem that when the paper has different dimensions, one side of the leading edge of the paper becomes unlatched and the paper tilts when fed out. It is an object of the present invention to provide an image forming apparatus that can orderly arrange the sheets accumulated in a stacker and can also feed the sheets without any problem even when the size of the sheets changes.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes an image forming means for forming an image on an image forming object, and an image forming means for forming an image on an image forming object via a position where the image forming means acts. a first conveying means for conveying the image forming body; a stacking means for accumulating the image forming bodies conveyed by the first conveying means; and supplying the image forming bodies from the accumulating means to the image forming means. a first notch provided in the accumulating means and extending in the direction in which the image forming object is supplied by the second conveying means; and a first notch that intersects with the first notch. a stacking stand formed with a second notch extending in a direction to align the image forming objects; a first guide means that engages with the first notch and is movable in the direction in which the image forming objects are supplied by the second conveyance means; a second guide means provided in the means and capable of engaging with a second notch of the accumulating table and movable in a direction intersecting a direction in which image forming objects are supplied by the second conveying means; The guide means and the first guide means are moved by a distance corresponding to the size of the image formation objects accumulated on the accumulation table, and the image formation objects accumulated on the accumulation means are aligned and viewed in plan. and a driving means provided substantially without protruding from the stacking table.

(Function) That is, the present invention has the above-mentioned configuration, so that when sheets of single-sided copies are stored in the stacking means, the sheets can be arranged in an orderly manner by the movement of the first guide means and the second guide means, and also double-sided copies can be arranged. It is possible to reliably feed one sheet at a time to the main body side for copying, and it can also be carried out without any problem even for sheets of different sizes.

(Example) The present invention will be described below based on an example shown in FIGS. 4 to 7. FIG. 4 is a perspective view showing the main parts of the automatic duplexing unit. In the figure, one of the peeling claws 36a is fixed to a side wall of an AD cassette (not shown), and positioned so as to be able to engage and disengage from the right corner of the tip side of the push-up plate 33, which rotates around the support shaft 33a. In addition, the above push-up plate (accumulation stand) 3
Notches 38 and 39 are provided at the rear end and one side (left side in the drawing) of 3.
An L-shaped push plate 37 and a side plate 40 are arranged so as to be able to engage with each other and move horizontally in the direction of the notch. That is, as shown in FIG. 5a, a rack A41 is formed on a part of the push plate 37, and a pinion A42 that meshes with this rack A41 is directly connected to a motor A43. on the other hand,
A rack B44 is also formed in a part of the side plate 40 as shown in FIG. 5b.
A pinion B45 that meshes with the motor B46 is directly connected to the motor B46, and the rising portion 40a of the side plate 40 is connected directly to the motor B46.
An arm piece 40b is integrally formed on one side of the arm piece 40b, and the other peeling claw 36b is attached to the end of the arm piece 40b, and is positioned so as to be able to engage with and disengage from the left corner of the tip side of the push-up plate 33. ing.

In addition, in 47 and 48, the push-up plate 33 is the support shaft 33a.
This is a notch that can be engaged with the peeling claw 36b attached to the side plate 40 when raised using the fulcrum as the fulcrum.

Next, the operation of the arrangement device based on the above configuration will be explained with reference to FIGS. 6a and 6b and FIG. 7. The paper P separated from the feed roller 32 shown in FIG. 2 and sent onto the push-up plate 33 is shown in FIG.
As shown by the dashed-dotted line, they are usually placed vertically and horizontally shifted. Therefore, when the motor B46 is first driven, the side plate 40 to which the peeling claw 36b is integrally attached moves in the direction of arrow Y (from C to D) via the rack B44, and one side edge of the sheets of paper P is aligned.
Next, when the motor A43 is driven, the push plate 37
moves in the direction of the arrow X (A→B) via the rack A41, so that the leading edge of the paper P is caught by the peeling claws 36a, 36b, and the paper P is collected with one edge aligned. If you want to make double-sided copies of multiple sheets of paper P, use the side plate 4 for the number of sheets.
0 and the movement of the push plate 37 are repeated. When a predetermined number of sheets of paper P are stacked on the push-up plate 33, the push-up plate 33 is raised around the support shaft 33a by a push-up mechanism (not shown), and the sheets P on the push-up plate 33 are Since the paper P is pressed against the feed roller 32, the sheets P can be reliably taken out one by one to the main body side photosensitive drum 12 shown in FIG. 2 for double-sided copying by the rotation of the feed roller 32.

FIG. 7 shows a state in which the paper P ₁ is changed to a paper P ₂ having a different size and stacked on the push-up plate 33. In this case, as described above, by moving the side plate 40 and the push plate ₃₇ in the direction of the arrow Y and the direction of the arrow
The peeling claw 36b engages with a notch 48 cut out at the tip of the push-up plate 33, and the feed roller 32 rotates to take out the sheets one by one while maintaining alignment. This means that you can do it.

In addition, according to the present invention, if a pulse motor is used as the drive motor for the side plate 40 and the pusher plate 37, the position of the paper P placed on the pusher plate 33 can be accurately controlled, so that the effect of stocking can be improved. There are advantages.

〔Effect of the invention〕

As explained above, according to the present invention, in the image forming apparatus, when sheets subjected to single-sided copying are stored in the stacking means, the sheets can be arranged in an orderly manner by the movement of the first guide means and the second guide means, and also double-sided copies can be arranged in an orderly manner. It is possible to reliably feed sheets one by one to the main body side for copying, and even for sheets of different sizes, the guide means can fit through the notch of the stacking base without substantially protruding from the stacking base in plan view. Since it operates by engaging with the stacking table, it has an excellent effect in that the sheets can be aligned without any trouble without taking up much space within the range of the size of the stacking table.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a copying machine suitable for adopting the present invention, Fig. 2 is a longitudinal sectional view of a copying machine equipped with an automatic duplexing unit, and Figs. FIG. 4 is a perspective view of an automatic duplexing unit showing an embodiment of the present invention, and FIGS. A perspective view of the plate and the side plate, FIGS.
The figure is a schematic plan view showing a state in which sheets of different sizes are arranged. P...paper, 30...AD cassette (accumulation means),
32... Feed roller, 37... Push plate (first guide means), 40... Side plate (second guide means), 43,
46...Motor (driving means).

Claims (1)

[Scope of Claims] 1. An image forming means for forming an image on an object to be imaged, a first conveyance means for conveying the object to be imaged via a position where the image forming means acts;
The apparatus includes a stacking means for stacking the image forming objects transported by the first transporting means, and a second transporting means for supplying the image forming objects from the collecting means to the image forming means, A first notch provided in the accumulating means and extending in a direction in which the image forming object is supplied by the second conveying means, and a second notch extending in a direction intersecting the first notch. a stacking stand for aligning the image forming objects; and a stacking stand provided in the stacking means without substantially protruding from the stacking stand when viewed from above, and engaged with a first notch of the stacking stand to form the second a first guide means movable in the direction in which the image forming object is supplied by the conveying means; and a second notch of the stacking table provided in the stacking means without substantially protruding from the stacking table in plan view. a second guide means that is engaged with the second guide means and is movable in a direction intersecting the direction in which the image forming object is supplied by the second conveyance means; The device is moved by a distance corresponding to the size of the image forming objects accumulated on the accumulating table, and aligns the image forming objects accumulated on the accumulating means so that they do not substantially protrude from the accumulating table in plan view. What is claimed is: 1. An image forming apparatus, comprising: a drive means having a drive means;