JPS62191334A - Automatic duplex copying device - Google Patents

Abstract

PURPOSE:To perform the delivery of paper accurately piece by piece to the body side for duplex copying, by installing an aligning device which aligns the paper in a stacking part into a state capable of taking it out by a takeoff device. CONSTITUTION:When a motor is driven, a side plate 40, to which a separating claw 36b is solidly attached, moves in a Y direction via a rack 44, whereby one side edge of paper P is trued up. Next, when another motor 43 is driven, a pressing plate 37 moves in an X direction via a rack 41, therefore the paper P has its tip engaged with both separating claws 36a and 36b and trued up in keeping the one end edge in a state of being trued up intact. And, when the specified number of sheets of the paper P are stacked in a state of being trued up on a push plate 33, this plate 33 goes up, and since the paper P is pressed by a feed roller 32, the paper P is accurately taken out piece by piece to a sensitive drum for its duplex copying by rotation of this roller 32.

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 automatic double-sided copying device that can be taken out one by one.

(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. Figure 1 shows a copying machine main body (2) with a document table (1) fixed to the top, and a plurality of cassettes (P) containing paper (P) to be inserted into the main body (2) and fed. 3)
, (4), and a removable tray (P) that collects the paper (P) that has been ejected after copying has been completed by the main body (2).
5). An illumination lamp (6) and a first mirror (7) are provided below the document table (1), and a document (not shown) placed on the document table (1) is provided.
The second mirror (8) and the third mirror (9) move horizontally while keeping the optical path length constant.

At this time, the illumination lamp (6), the first mirror (7)
, the second mirror (8), and the 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 illuminated by the illumination lamp (6), the reflected light passes through the condenser lens (lO) and the fourth mirror (11). An image is formed on the surface of the photosensitive drum (12).

A charger (13) is disposed around the outer periphery of the photosensitive drum (12) to charge the surface of the photosensitive drum (12), so that the surface of the photosensitive drum (12) reflects the imaged image. A portion is erased by light to form a latent image.

This latent image is developed by a developing device (14) disposed around the outer periphery of the photosensitive drum (12), and a visible image made of toner is obtained.

On the other hand, the uppermost sheet (P) is taken out from, for example, the lower cassette (4) inserted into the negative side of the copying machine main body (2) by rotation of the delivery roller (16). The photosensitive drum (
12), 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) transferred in this way is transferred to the transport roller (1
9) and a guide member (20), and is transported to the fixing device (21). Then, the paper CP which has been fixed is discharged to the tray (5) attached to the minus side of the copying machine body (2) and accumulated.
After the transfer has been completed, the photosensitive drum (12) passes through a charger (22) for static elimination arranged on the outer periphery, is cleaned by a cleaning device (23) to remove residual toner, and is returned to the charger (13) again. It is designed to be charged back.

Also, the paper (P) stored in the cassette (3) is
) As with the case of the lower cassette (4), the sheets can be taken out one by one by the rotation of the delivery roller (15), copied, and then discharged to the tray (5) and stacked. can.

Therefore, the paper (P) supplied to the lower cassette (4)
is fed into the main body side to complete one-sided copying, and after being accumulated in the tray (5), it is manually taken out from the tray (5) and fed to the upper cassette (3) to copy both sides of the paper (P). It can be copied. Next, Figure 2 shows an automatic duplex copying unit (hereinafter referred to as A).
This figure shows an example of a copying machine equipped with a D unit (abbreviated as D 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, an AD unit (30) is provided above the lower cassette (4) to temporarily accumulate the sheets (P) sent from the fixing device (21) and then take them out again. That is, on the ejection side of the paper (P) fixed by the fixing device (21), there is a rotatable guide selector that guides the paper (P) to the AD unit (30) via the paper ejection roller (24). (31) is provided.

The An unit (30) is connected to the guide selector (31).
) and a pair of feed rollers (32) that feed the paper (P) guided into the cassette (34); Temporarily accumulated in the state, and one end is a feed roller (32)
A cassette (34) having a swingable push-up plate (33) that can be pushed up to the side, and a push-up plate (34) provided at the outlet of the cassette (34) that is rotated by the rotation of the feed roller (32). It consists of a pair of feed rollers (35) that feed out the paper (P) taken out from the paper (33).

In addition, (25) and (26) are the lower cassette (4).
) and a guide body arranged between the outlet of the AD cassette (30) and the registration roller (17) to guide the taken out paper (P).

Next, the basic principle based on the above configuration will be explained. First, from 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 guided by the guide body (25). It is sent to the registration roller (17) in the direction of arrow A. Next, the paper (P) is placed on the registration roller (17
), the toner image formed on the surface of the photosensitive drum (12) is transferred onto one side of the paper (P).
9) and a guide member (20) to the fixing device (21) in the direction of arrow B. here,
When duplexing multiple 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. Therefore, the paper (P) fixed by the fixing device (21) is transferred from the paper ejection roller (24) to the guide selector (
31) while being guided in the direction of arrow C. Then, the paper (P) is fed in the direction of the arrow by the rotation of the feed roller (32) and is placed on the push-up plate (33) that constitutes a part of the AD unit (34), and the paper (P) that follows is
) can also be stacked in a stacked state by repeating the same operation for the required number of sheets. (See Figures 3(a) and (b)) In this way, when multiple sheets of paper (P) with single-sided copies are accumulated on the push-up plate (33), the result shown in Figure 3(c) is As shown above, the push-up plate (33) is the topmost paper (P).
The single-sided copy sheets (P) accumulated on the push-up plate (33) are pushed up in the direction of arrow E by the rotation of the feed roller (32). It is taken out to the exit side of the cassette (34) shown.

Then, the paper (P) is held between the feed rollers (35) and fed again to the registration rollers (17) in the direction of arrow F while being guided by the guide body (26). Then,
The paper (P) is fed along the outer peripheral surface of the photosensitive drum (12) by the rotation of the registration roller (17).

The toner image formed on the surface of the photosensitive drum (12) is transferred to the other surface of the paper (P). That is, toner images are transferred to both sides of the paper (P). Thus, 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, the guide selector (31) is rotated to the position shown by the dotted line and is on standby, so that the other side of the paper (P) is fixed by the fixing device (21), so that the paper (P) is fixed on both sides. The paper (P) passes through the paper ejection roller (24), and is sent to the tray (5) in the direction of arrow G while being guided by the guide selector (31) to be stacked, completing the double-sided copying.

Next, FIGS. 3(a) to 3(C) show a state in which sheets (P) with one side 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 pushed up by the push-up plate (3) by the feed roller (32).
3) It is sent upward. (See Figure 3(a)) Next,
When the paper (P) is detached from the feed roller (32), it falls onto the push-up plate (33)l, but at this time, the push-up plate (33), which is loosely fitted to the rear of the push-up plate (33), Board (
37) presses the push-up plate (33) toward a peeling claw (36) fixed close to its tip side. That is, the push plate (37) is designed to move horizontally from the position (A) to the position (B) as shown in FIG. ). here,
When making double-sided copies of multiple sheets of paper (P).

The horizontal movement of the push plate (37) is repeated for the number of sheets. Then, a predetermined number of sheets of paper (P) are pushed up to the push-up plate (33).
When the sheets are stacked on top, the push-up plate (33) is raised by a push-up mechanism (not shown), and the sheets (
Since the paper (P) is pressed against the feed roller (32), the sheets (P) are taken out one by one to the main body side photosensitive drum (12) for double-sided copying by rotation of the feed roller (32). However, the paper CP fed onto the push-up plate (33) is generally misaligned and is placed in the state shown by the dashed line in FIG. 6(a).
) when the paper (P) cannot be collected in a satisfactory condition even if it is pressed against the peeling claw (36) side, and the sizes of the paper (P) stacked on the push-up plate (33) are different. has a pair of peeling claws (36a).

Since the paper (36b) is of a fixed type, there is a risk that one side of the leading edge of the paper (P) will not be locked and the paper (P) will be tilted during feeding.

(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 size is different, 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 automatic double-sided copying device that can orderly arrange the sheets stacked in a stacker and can feed out 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 provides a stacking section for temporarily stacking sheets on which an image is formed on one side, and a stacking section for collecting sheets of paper stacked in this stacking section one by one. The apparatus is constructed by providing a take-out means for taking out the sheets, and an alignment means for arranging the sheets in the stacking section so that they can be taken out by the take-out means.

(Function) That is, the present invention has the above-mentioned configuration, so that when a sheet of paper that has been copied on one side is stored in the automatic duplex unit,
By moving the push plate and side plate that make up the alignment means, it is possible to arrange the paper in an orderly manner, and it is also possible to reliably feed one sheet at a time to the main body for double-sided copying, and there is no problem even with paper of different sizes. can be done.

(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 duplex unit. In the figure, one of the peeling claws (36a) is fixed to the side wall of an AD cassette (not shown), and the supporting shaft (33a)
The push-up plate (33) is positioned such that it can be engaged with and disengaged from the right corner of the tip side of the push-up plate (33), which rotates around the center. In addition, notches (38) and (39) are provided at the rear end and one side (left side in the drawing) of the push-up plate (33), and these notches (3g) and (39) are engaged with each other, respectively. An L-shaped push plate (37) and a side plate (40) are arranged so as to be horizontally movable in the direction of the notch. That is, as shown in FIG. 5(a), a rack A (41) is formed on a part of the push plate (37), and this rack A (41)
) Pinion A (42) that meshes with motor A (43)
is directly connected to. On the other hand, a rack B (44) is also formed in a part of the side plate (40) as shown in FIG. ), and furthermore, an arm piece (40b) is integrally formed on the negative side of the rising portion (40a) of the side plate (40), and the other peeling claw (36b) is attached to the end of this arm piece (40b). is attached and positioned so as to be able to engage and disengage from the left corner on the tip side of the push-up plate (33).

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

Next, the operation of the arrangement device based on the above configuration will be explained with reference to FIGS. 6(a) and 6(b) and FIG. 7. The paper (P) separated from the feed roller (32) shown in Fig. 2 and fed onto the push-up plate (33) is shown in Fig. 6(a).
As shown by the dashed-dotted line, they are usually placed vertically and horizontally shifted. Therefore, when the motor B (46) is first driven, the side plate (40) to which the peeling claw (36b) is integrally attached.
) is moved in the direction of arrow Y via the rack B (44) (C->(D)), and the - side edges of the sheets (P) are aligned. Next, when motor A (43) is driven, the push plate (
37) moves in the direction of the arrow X ((A) → (B)) via the rack A (41), the paper (P) is removed by the peeling claws (36a) and (36b) with the - side edges aligned. ), the leading edge of the paper (P) is caught and arranged. When double-sided copying is performed on a plurality of sheets of paper (P), the movement of the side plate (40) and the push plate (37) is repeated for the number of sheets. Then, a predetermined number of sheets of paper (P) are pushed up on the push-up plate (3
3) When stacked on top, the push-up plate (33) is pushed up against the support shaft (33a) by a push-up mechanism (not shown).
The paper (P) on the push-up plate (33) rises with
is pressed against the feed roller (32), so the above paper (
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 rotation of the feed roller (32).

FIG. 7 shows a state in which the paper (P,) is changed to a paper (P2) of 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 arrow Y direction and the arrow The support shaft of the plate (33) (
By raising the peeling claw (33a) as the center, the peeling claw (33a)
6b) engages with a notch (48) cut out at the tip of the push-up plate (33), and is rotated by the rotation of the feed roller (32).
This means that the sheets can be taken out one by one while maintaining their alignment.

In addition, in the present invention, if a pulse motor is used as a drive motor for the side plate (40) and the push plate (37), the push plate (37) can be moved easily.
33) There is an advantage that the position of the paper CP placed thereon can be accurately controlled, thereby improving the effectiveness of the arrangement.

〔Effect of the invention〕

As explained above, according to the present invention, when paper that has been copied on one side in an automatic duplex copying device is stored in the automatic duplex unit, the sheets can be arranged in an orderly manner by moving the push plate and the side plate, and the main body side can be used for double-sided copying. It is possible to reliably feed out one sheet at a time, and it also has the excellent effect of being able to feed sheets of different sizes without any trouble.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a copying machine suitable for adopting the present invention;
The figure is a vertical sectional view of a copying machine equipped with an automatic duplexing unit, and FIGS. 4
The figure is a perspective view of an automatic duplexing unit showing an embodiment of the present invention, FIGS. 5(a) and 5(b) are perspective views of a push plate and side plate showing essential parts of the automatic duplexing unit, and FIG. 6(a) , (b) is a schematic plan view showing a state in which sheets of paper of different sizes are aligned by the push plate and side plate shown in FIG. 5, and FIG. 7 is a schematic plan view showing a state in which sheets of different sizes are aligned.

Claims (6)

[Claims] (1) A stacking section for temporarily stacking sheets with an image formed on one side; a take-out means for taking out the sheets stacked in the stacking section one by one; and a take-out means that allows the sheets in the stacking section to be taken out. An automatic double-sided copying device comprising: alignment means for aligning the two sides. (2) The automatic double-sided copying apparatus according to claim 1, wherein the alignment means includes a plate provided in the stacking section so as to be movable in a direction toward and away from the side edges of the sheets. (3) The automatic double-sided copying apparatus according to claim 2, wherein the alignment means includes a drive means for moving the plate material. (4) A patent claim characterized in that the aligning means includes a plate fixed to the stacking section, and the sheets are aligned by abutting the side edges of the sheets against the plate. The automatic double-sided copying device according to any one of item 1 or item 2. (5) The alignment means includes a plate member that is movable in the direction toward and away from the side edge of the paper, and the size of the paper stack in the stacking section is changed by the plate member. The automatic double-sided copying device according to scope 1. (6) the ejecting means rotates in contact with the paper in the stacking section;
2. The automatic double-sided copying apparatus according to claim 1, further comprising a take-out roller for taking out the paper.