JPH02117568A - Picture forming device - Google Patents

Abstract

PURPOSE:To perform automatic double copying by providing a turn-over means which turns over an original taken out from an original placing table and guides it to a feed means again. CONSTITUTION:In the case of single copying, a single copied original G is conveyed from an original placing table 38 to a discharge means 51 to discharge the original through the working of a discharge means 53. In the case of double copying, the original G taken out from the original placing table 38 is guided to a turn-over means 83 by means of a switching means 84. The single-copied original G is turned over by the turn-over means 83 and is guided to a delivery means 53 again, and through rotation of the delivery means 53, the original G is conveyed to the original placing table 38, and the other surface of the original G is copied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an image forming apparatus that is applied, for example, as an electronic copying machine.

(Prior Art) An electronic copying machine is equipped with, for example, an automatic document feeder 1 as shown in FIG. Is there something that can be sent there?

The automatic document feeder 1 includes a unit 3, which includes a pickup roller 4, a pair of paper feed rollers 5, and a pair of registration rollers 6 in order along the conveyance direction of the document G.
, a stopper 101 is provided, and the unit 3
A delivery roller 7 is provided at the front part of the paper.

In addition, inside the unit 3 (a curved conveyance guide 10
2, a discharge roller 103 is provided at the upper end of this conveyance guide 102, and a Mylar 105 is provided at the lower end.

Further, a platen cover 104 is provided on the upper surface of the document table 2, and a movable sheet 9 is provided within the platen cover 104.

Therefore, when copying, first, as shown in Fig. 13(a)
As shown in , set the original G and turn on the copy button (not shown) on the operation panel.

As a result, the pickup roller 4 descends while rotating, contacts the original G, and sends out the original G.

As shown in FIG. 13(b), this document G is separated one by one by a paper feed roller 5 and sent to a pair of registration rollers 6, where the originals are aligned and sent out. Furthermore, as shown in FIG. 13(C), this document G is fed by a pair of registration rollers 6, pushing up Mylar 105 and being sent out. At this time, the stopper 101,
The delivery roller 7 and the movable platen sheet 9 are operated by a drive mechanism (not shown) and are moved upward.

Therefore, the document G with Mylar 105 pushed up is moved to the stopper 101, the delivery roller 7 and the movable platen sheet 9.
The rear end is shown in Fig. 13(d).
As shown in FIG. 2, after passing the registration roller 6, the delivery roller 7 is rotated in the forward direction and lowered to come into contact with the document G and send the document G therethrough. Due to this feeding, the rear end of the document G is moved a distance δ from the stopper 101, as shown in FIG. 13(e).
When the document G is separated by a certain amount, the rotation of the delivery roller 7 is stopped, and the feeding of the document G is stopped. Thereafter, as shown in FIG. 13(f), the delivery roller 7 is reversely rotated to retract the document G, and the rear end surface of the document G comes into contact with the stopper 101, so that the document G is aligned. After the document G is aligned in this way, the movable platen sheet 9 is moved as shown in FIG. 13(g).
descends and presses down the document G. Copying starts from this state. Then, when the copying is completed, Fig. 13 (h)
As shown in FIG. 2, the movable platen sheet 9 is lifted, the delivery roller 7 rotates in the opposite direction, and the document G is sent upward via the conveyance guide 102 and is ejected from the ejection roller 103. The sensor 106 is the document G
It is turned on by

By turning on this paper discharge sensor 106, as shown in FIG. 13(i)
As shown in FIG. 2, the feed roller 7 moves upward and the registration rollers 6 are driven, so that the next document G is aligned and sent out. This document G is sent and conveyed below the previous document G. Then, as shown in FIG. 13(j), when the previous document G comes off the delivery roller 7, the delivery roller 7 descends and moves the next document G to the left, as shown in FIG. 13(h). send to.

Thereafter, the originals G are sequentially sent in and copied in the same manner.

(Problem to be Solved by the Invention) However, in the past, it was not possible to reverse the original G taken out from the original platen 2 after copying and send it again to the original platen 2, and the original In the case of a double-sided document that has document images on both sides, there is a problem in that it is not possible to make double-sided copies using automatic feeding.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an image forming apparatus that can automatically copy both sides of a document, even if the document has images on both sides. That is.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention sequentially feeds originals one by one to a document mounting table by rotating a sending means, and after image formation, the originals are A reversing means for reversing the original taken out from the original placing table and guiding it to the sending means again; The apparatus is characterized by comprising a switching means for selectively guiding the taken out original to the reversing means or the ejecting means.

(Function) With the above means, when double-sided copying is to be performed, the original can be automatically reversed and sent to the original placing table.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 to 11.

FIG. 2 shows an electronic copying machine, in which a photosensitive drum 12 is provided approximately at the center of a main body 11 so as to be rotatable in the direction of the arrow. Around the photosensitive drum 12, a charger 13, an exposure section 14,
A developing unit 15, 16, a transfer charger 17, a peeling charger 18, a cleaner 19, and a static eliminator 20 are provided.

Further, an optical system 21 is provided in the upper part of the main body 11. This optical system 21 is composed of an exposure lamp 22, first to third reflecting mirrors 23, 24.degree. 25, a lens 26, and fourth to sixth reflecting mirrors 27, 28, and 29.

Further, a paper feed cassette 30.
A paper conveyance path 32 that conveys the paper sent out from 31
is provided.

In the paper transport path 32, along the paper transport direction,
Registration roller pair 33, transfer and peeling charger 1
7.18, a conveyor belt 34, a fixing device 35, and a pair of paper discharge rollers 36 are provided.

Further, a pair of paper ejecting rollers 36 are provided at the lower part of one side of the main body 11.
A paper discharge tray 37 is provided to receive paper discharged from the paper.

On the other hand, a document placing table 38 is provided on the upper surface of the main body 11, and a platen cover 39 is placed on the document placing table 38.
is provided. A movable platen sheet 40 is provided inside the platen cover 39.

Furthermore, an automatic document feeding device 41 is provided on one side of the document placing table 2 .

This automatic document feeder 41 is equipped with a unit 42 as shown in Figure TS1, and this unit 42 includes a pickup roller 43, paper feed/separation rollers 44, 45, a registration sensor 46, a pair of registration rollers 47, and A stopper 48 is provided as a positioning member.

Furthermore, a U-shaped conveyance guide 4 is provided inside the unit 42.
A paper ejection sensor 50 and a pair of paper ejection rollers (paper ejection means) 51 are provided at the upper end of the conveyance guide 49, and a Mylar 52 is provided at the lower end.

Further, a delivery roller (delivery means) 53 is provided at the front part of the unit 42, and both ends of a shaft 54 of the delivery roller 53 are connected to a pair of rotating arms 55 and 55, as shown in FIG. Supported at one end. The pair of rotating arms 55,55 are supported by a pickup shaft 56, and a solenoid 58 is connected to the first end of the pickup shaft 56 via a link 57. The link 57 is biased by a spring 58a.

Further, a timing belt 59 is stretched between the shafts 54 of the delivery rollers 53, 53 and the pickup shaft 56, and a timing belt 60 is stretched between the pickup shaft 56 and the drive shaft 62. ing.

The drive shaft 62 is driven to rotate in forward and reverse directions by a drive motor (not shown).

On the other hand, as shown in FIG. 1, an intermediate sensor 81 and an intermediate roller 82 are disposed in the middle of the conveyance guide 49, and a reversing means is provided between the intermediate roller 82 and the paper ejection roller 51. A reversing guide 83 is connected thereto.

A switching gate 84 serving as switching means is rotatably provided at the connection portion between the reversing guide 83 and the four transport guides. The switching gate 84 is rotated in the direction of the arrow, and the document G sent from the intermediate roller 82 is rotated in the direction of the arrow.
is selectively guided to the paper discharge roller 51 or the reversing guide 83.

Further, the right half of the movable platen sheet 40 is attached to a rotating frame 63, as shown in FIGS. is supported by A rotating lever 65 is connected to the opposite end of the rotating frame 63 via a pin 66 and is pressed downward by a coil spring 75. A lever 68 is connected to the daily motion lever 65 via a shaft 67. Furthermore, the lever 68 is provided with a platen cover 39.
A first pusher 71 slidably provided is connected to the first pusher 71, and a second pusher 72 and a cam 73 are connected to the first pusher 71. A cam motor 74 is connected to the cam 73.

Therefore, when copying, first, as shown in Fig. 10(a)
As shown in , the original MG is set on the tray 61 of the automatic document feeder 41, and the copy button (not shown) on the control panel is pressed. As a result, as shown in FIG. 10(b), the pickup roller 43 descends while rotating, contacts the document G, and sends it out. This document G passes between a paper feed roller 44 and a separation roller 45, and is sent one by one to a pair of registration rollers 47, and is aligned by this pair of registration rollers 47. As shown in FIG. 10(C), this document G is sent by a pair of registration rollers 47, pushes up Mylar 52, and is sent out.

At this time, the solenoid 58 is excited and the cam motor 74 is driven. By energizing the solenoid 58, the lever 57 is rotated against the biasing force of the spring 58a, the rotation arm 55.55 is rotated upward, and the delivery rollers 53, 53 are raised. In addition, the cam motor 7
4, as shown in FIG. 7, the cam 73 is rotated and the second pusher 72 is rotated in the direction of the arrow. Due to this rotation, the second pusher 71 is moved in the direction of the arrow,
The rotating lever 65 is rotated in the direction of the arrow. This results in
As the rotating frame 63 is rotated, the platen sheet 40 is lifted upward as shown in FIG. 9, and a gap is formed between the platen sheet 40 and the platen glass 38. Furthermore, at this time,
The stopper 48 is rotated upward by a drive source (not shown). Therefore, the document G with the Mylar 52 pushed up is sent through the stopper 48, the delivery roller 53, and the lower side of the movable platen sheet 40, and the rear end portion is shown in FIG.
As shown in d), after passing through the registration roller 47,
The feed roller 53 is rotated and lowered, contacts the original G, and sends out the original G. By this feeding, as shown in Fig. 10 (e
), when the rear end of the document G leaves the stopper 48 by a distance δ, the rotation of the delivery roller 53 is stopped, and the feeding of the document G is stopped. After that, Figure 10 (f
), the delivery rollers 53, 53 are rotated in the opposite direction, the document G is retreated, and its rear end surface contacts the stopper 48 and is aligned. After the original G is aligned in this manner, the movable platen sheet 40 is lowered and presses the original G. Copying starts in this state.

When copying is completed, as shown in FIG. 10(g), the movable platen 40 and stopper 48 are lifted, and the delivery roller 53 descends while rotating in the opposite direction to contact the original fKG and take out the original G. This document G is sent upward via four conveyance guides, and is ejected from the ejection roller 51 as shown in FIG. 10(h).

Next, a case where the original is a double-sided original with original images on both sides and both sides of the original are to be copied will be described.

In this case, one side of the original G is shown in FIGS.
11(g), the copied original G is taken out from the original table 38, and at the same time, the switching gate 84 is rotated upward as shown in FIG. 11(a). As a result, the original G sent along the four transport guides is sent to the reversing guide 83 via the switching gate 84.

As shown in FIG. 11(b), this original G is fed to the lower side of the feed roller 53, and when the original G is fed a predetermined distance, it is fed out as shown in FIG. 11(C). roller 53
rotates and descends, contacts the original G, and feeds it. At this time, as shown in FIG. 11(d), the stopper 48 is lowered, and as shown in FIG. 11(e), the feed roller 53 is rotated in the opposite direction to reversely feed the document G, and then The end portion is brought into contact with the stopper 48 and aligned, and
The movable platen sheet 40 is lowered and presses the original G.

Thereafter, copying is performed in the same manner as described above, and after the copying is completed, the switching gate 84 is rotated downward again, and the original G that had been taken out from the original placing table 38 is transferred via the conveyance guide 49 to the position shown in FIG. 11 (h). ), the paper is discharged from the discharge roller 51.

As described above, by switching the switching gate 84, it is possible to selectively perform single-sided or double-sided copying with automatic feeding, which has the advantage of diversifying functions.

Further, as shown in FIG. 11(b), the delivery roller 53
Since the document G is separated from the document placement table 38, there is no risk of jamming even if the document G overlaps under the delivery roller 53.

Note that the present invention is not limited to the above embodiments,
For example, even if the feed roller 53 is a fan-shaped swinging member or the discharge roller pair 51 grips and discharges the document, the same effect as in the above embodiment can be obtained.

Furthermore, the arrangement position and means of the switching gate 84 are not limited to the present embodiment.

[Effects of the Invention] As described above, according to the present invention, not only single-sided copying but also double-sided copying can be performed by automatic feeding, which is extremely convenient.

[Brief explanation of drawings]

1 to 10 show an embodiment of the present invention,
Figure 1 is a block diagram showing the automatic document feeder, Figure 2 is a schematic diagram showing the electronic copying machine, Figure 3 is a perspective view of the automatic document feeder, and Figure 4 is the automatic document feeder and platen. FIG. 5 is a perspective view showing the platen cover in an open state, FIG. 6 is a perspective view showing the rotating mechanism of the platen sheet, FIG. 7 is a side view thereof, and FIG. 8 is a perspective view showing the movable platen. FIG. 9 is a perspective view showing the movable platen sheet in an open state, FIG. 10 is an explanatory diagram showing automatic document feeding during one-sided copying, and FIG. 11 is an illustration showing automatic document feeding during double-sided copying. FIG. 12 is an explanatory diagram showing a conventional example of the document, and FIG. 13 is an explanatory diagram showing automatic feeding of the original. 38... Document placement table, 51... Ejection roller pair (ejection means) 53... Ejection roller pair (ejection means), 83.
...Reversing guide (reversing means), 84... Switching gate (switching means), G... Document. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] The document is sent one by one to the document placing table by rotation of the sending means, and after image formation, the document is taken out from the document placing table and sent to the ejecting means, and the document is ejected by the ejecting means. A reversing means for reversing the document taken out from the original and guiding it again to the sending means, and a switching means for selectively guiding the original taken out from the document placing table to the reversing means or the ejecting means. An image forming apparatus characterized by: