JPS6343168A - Automatic double-side copying machine - Google Patents

Abstract

PURPOSE:To copy the images of a double-sided original to both the sides of paper by validating an original feeding means at the time of the 1st paper feeding to a copying process part in case of validating a double-sided carrying means, and at the time of 2nd paper feeding to the copying process part, validating an original reversing means. CONSTITUTION:In case of selecting a double-side copying mode, ON/OFF of a solenoid is controlled, clutches (CLTs) 1-3 and an original charge 7 are turned on to rotate an original cylinder 6, to feed the original and paper and to execute the copying process. After completing the copying process, sensors S1, S2 are turned off, the original is discharged to an original tray 4,and when the paper reaches an intermediate tray 32, the CLTs 2, 4 are turned on. Consequently, the original is fed to the cylinder 6 and the paper is guided from the tray 32 to a switch back carrier 33. Thus, the paper is fed so that its back is opposed to a photosensitive drum 22 and the original is fed so that its back is opposed to an exposure platen 10 to execute the copying process.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field This invention relates to an automatic duplex copying machine that copies an image of a single-sided original onto one side of a sheet of paper, and an image of a double-sided original onto both sides of a sheet of paper. .

(b) Summary of the Invention To summarize, the automatic double-sided copying machine according to the present invention reverses the original after image scanning and transfers it to the original tray in order to prevent cost increase and increase in installation space due to the use of multiple devices. At the same time as being ejected, the original is guided to the image scanning section again, thereby eliminating the need to provide separate transport paths for single-sided and double-sided originals.

(C) Conventional Technology With the diversification of copying functions, there are automatic duplex copying machines that copy images on both sides of a document onto each side of a sheet of paper. For example, this is
The device disclosed in Publication No. 4 includes a single-sided original transport path that leads a single-sided original to an image scanning unit, and a double-sided original and original transport path that transports a double-sided original to an image scanning unit, and is configured to operate according to a preset and input mode. , enable either the single-sided document transport path or the double-sided document transport path. At the same time, in the main body of the copying machine, the paper is guided twice to the copying process section, so that each image of the double-sided original is copied in each copying process.

(d1 Problems to be Solved by the Invention In the conventional automatic double-sided copying machine as described above, it is necessary to provide a feeding path for single-sided originals and a feeding path for double-sided originals in the device that feeds the original. In addition, it is necessary to provide transportation means, guides, etc. for each route.This increases costs, requires a large space for installation, and increases the number of failure points due to the increase in movable devices. .

An object of the present invention is to guide a document to be copied from a document tray to an image scanning section, and to reverse the document after image scanning and return it to the document tray. The document is guided twice to the document scanning unit, during which time the copying process can be performed on both sides of the paper, allowing each image of a double-sided document to be copied on both sides of the paper, reducing costs, reducing installation space, and reducing the frequency of failures. An object of the present invention is to provide an automatic double-sided copying machine that can realize the following.

(Means for Solving Problem e1) The automatic double-sided copying machine of the present invention includes a single-sided conveyance means for guiding the paper once passed through the copying process section to the paper ejection section, and a single-sided conveying means for guiding the paper once it has passed through the copying process section, and a means for reversing the front and back sides and sending it again to the copying process section. In an automatic double-sided copying machine, the automatic duplex copying machine is equipped with a double-sided conveying means for guiding the originals one by one from the document tray to the image scanning section, and a document feeding means for guiding the originals on the document tray one by one from the document located at the bottom to the image scanning section; A document ejecting means that reverses the front and back sides and ejects the document from above to the document tray, a document reversing feeding device that guides the document ejected to the document tray again to the image scanning unit, and a document feeding device that redirects the original that has been ejected to the document tray from above to the document tray. Regarding the copying process, when the single-sided original copying means that enables the original feeding means and the original reversing feeding means, and the double-sided original conveying means are enabled, the original is fed the first time paper is fed to the copying process unit. The present invention is characterized in that it includes a double-sided document copying device which enables the document reversing feeding device when feeding the document to the copying process section for the second time.

(F1 action) According to the present invention, (1) The originals placed on the original tray are guided to the image scanning section in order from the one located below.

■ The original that has passed through the image scanning section is outputted upside down onto the original tray.

(2) The document reversing and feeding means guides the document, which has been reversed and discharged onto the document table, to the image scanning unit again.

■ When copying an image of a one-sided original onto one side of a sheet of paper, the original feeding means and the original reversing feeding means are enabled in each copying process.

(2) When copying images of a double-sided original onto both sides of a sheet of paper, the original feeding means and the original reversing feeding means are enabled in each of the two copying processes.

(Embodiment a) FIG. 2 is a schematic front sectional view showing the configuration of an automatic double-sided copying machine which is an embodiment of the present invention.

Inside the copying machine main body 21, a copying process section 26 including devices such as an irradiating drum 22, a developing device 23, a transfer charger 24, and a peeling charger 25 is configured.

A paper cassette 27 is attached to one side of the copying machine main body 21, and together with a paper feed roller 28, constitutes a paper feed section 29.

An intermediate tray 32 is provided below the copying process section 26 . This intermediate tray 32 has an intermediate paper feed roller 34.
is provided. Further, a paper discharge tray 35 is attached to the other side of the copying machine main body 21.

A paper conveyance path 41 is configured between the paper feed section 29, the copy process section 26, the intermediate tray 32, and the paper discharge Iz tray 35. This paper transport path 41 is provided with a timing roller 36, a transport belt 30, a fixing device 31, and a flapper 37. A switch bank conveyance path 33 is formed between the intermediate tray 32 and the paper feed section 29.

The flapper 37 swings with one end as a fulcrum, and the paper output tray 3
5 or the switchback conveyance path 33 is selectively opened. A paper feed roller 28 provided in the paper feed section 29 is provided with a paper feed clutch CLT3. Further, an intermediate paper feed roller 34 provided on the intermediate tray 32
is provided with an intermediate paper feed clutch CLT4. These clutches CLT3.4 selectively transmit driving force to paper feed roller 28 and intermediate paper feed roller 34. flapper 3
7 is equipped with a solenoid SQL 1. The flapper 37 swings by turning on/off the solenoid SQL1.

An exposure platen 10 and a light '
An optical system device 12 including a11, a lens 13, etc. is arranged. This optical system device 12 irradiates the image surface of the document with light from a light source 11 and distributes the reflected light onto the surface of a photosensitive drum 22 via a lens 13 .

A document circulation feeder W1 is mounted on the top surface of the copying machine main body 21. Inside the document circulation feeding device 1, a document cylinder 6 is pivotally supported above the exposure platen 10. As shown in FIG.

A document charger 7 is provided facing the document cylinder 6, and charges the surface of the document cylinder 6 by corona discharge.

The original cylinder 6 wraps the original due to this charging. A document tray 4 is attached to the document circulation feeding device l. The document tray 4 includes a document feed belt 2 and a document feed roller 3, and guides a plurality of placed documents to a document cylinder 6 in order starting from the lowest one. A feeding guide 9 faces the document cylinder 6, and this feeding guide 9 reaches the discharge roller 5. The discharge roller 5 is located above the feed roller 3. The document discharged from the discharge roller 5 has its front and back sides reversed from the state in which it was initially placed on the document tray 4. The feed belt 2 and the feed roller 3 are provided with a feed latch CLT2, to which rotational force is selectively transmitted. Further, the document cylinder 6 is equipped with a clutch CLTI, and its rotational operation is controlled. The release claw 8 of the tool 11 is in contact with the original cylinder 6,
The original is peeled off from the surface of the original cylinder 6. The above-described feeding belt 2 and feeding roller 3 are the document feeding means of the present invention, and the ejection roller 5 and feeding guide 9 are the document discharging means of the present invention.

A sensor Sl is located near the discharge roller 5 of the document feeding guide 9.
A sensor S2 is provided in the paper transport path 41 near the intermediate tray 32, and a sensor S3 is provided in the paper transport path 41 near the paper discharge tray 35. These sensors S1 to S3 detect a document or paper at their respective positions.

FIG. 3 is a block diagram of the control section of the automatic double-sided copying machine.

Detection data from the sensors S1 to S3 is input to the CPU 51 via the I10 interface 54. CPU51
calculates control data based on this detection data according to a program stored in the ROM 52, and outputs this control data to the clutch driver 55 and the solenoid driver 56 via the ■/○ interface 54. The clutch driver 55 controls the clutch CL based on the control data.
Drive T1 to CLT4. Also, solenoid driver 5
6 drives solenoid SQL 1 according to control data.

FIG. 1 (A+ and (Bl) is a flowchart showing the operation when the number of original documents is one in the automatic double-sided copying machine.

When the power is turned on, warming-up is started, and after the warming-up is completed, data is input and the mode is set, and the printer waits for the print switch to be operated (nl-n5). When the print switch is operated, the set mode is checked (n5=n6). When single-sided copy mode is selected, solenoid SQL 1 is turned off, and when double-sided copy mode is selected, solenoid 5OLI is turned on (n 6 - = n 7. n 8).
o If solenoid SQL l is turned off, flapper 3
7 opens the paper conveyance path 41 from the intermediate tray 32 to the paper discharge tray 35 direction. Conversely, when the solenoid SQL 1 is turned on, the flapper 37 opens the intermediate tray 32 toward the switchback conveyance path 33 .

After on/off control of solenoid SQL 1, clutches CLTI-CLT3 and document charger 7 are turned on (n9 to n1l), rotating document cylinder 6, feeding the document and feeding paper, and executes the copying process. (n 12).

When the copying process is completed, the mode is checked again (n13). If the single-sided copy mode is set, wait for sensors S1 and S2 to turn off (n 1
4). After sensors S1 and S2 are turned off, that is, after the original is ejected to original tray 4 and the paper reaches intermediate tray 32, clutches CLT2 and CLT4 are turned on (n15, n16). As a result, the original is fed to the original cylinder 6 again, and the paper is ejected from the intermediate tray 32 to the paper output tray 35. This operation is performed by sensor S1
and S3 are turned off, and sensors Sl, S
3 is turned off, that is, the original is ejected onto the original tray 4 again, and after the ejection of the paper is completed, the state returns to the standby state (n17-n3).

If the duplex copy mode is set in the mode check after the copying process is completed, sensors Sl and S2 are turned off, the original is ejected to the original tray 4, and after the paper reaches the intermediate tray, the clutch CLT2 and CLT4
is turned on (n21 to n23). As a result, the original is fed again to the original cylinder 6, and the paper is guided from the intermediate tray 32 to the switchback conveyance path 33.

In this way, the paper is fed so that the back side faces the photosensitive drum 22, and the back side of the document is fed so as to face the exposure platen 10, and then the copying process is executed (n
24). After the copying process for the back side is completed, the solenoid SQL 1 is turned off (n25), and the direction from the intermediate tray 32 to the paper discharge tray 35 is opened. In this state, sensors S1 and S3 are turned off (n26), and when the ejection of the original is completed, the clutches CLT2 and CLT4 are turned off and the state returns to the standby state (n27-n3).
.

In the above, n14 to n16 and n21 to n23 correspond to the document reversing feeding means of the present invention, n6 to n17 similarly correspond to the one-sided document copying means, and n7 to n13 and n
21 to n27 also correspond to double-sided original copying means.

As described above, the document ejected from the ejection roller 5 is reversed from the state it was in when fed, so when copying the image of a one-sided original onto one side of the paper, the paper reaches the paper ejection tray from the paper feed section. In the meantime, the document is fed twice in the document circulation feeding device 1. As a result, the original is discharged onto the original tray 4 in the state in which it was initially placed. Therefore, when copying images of the same single-sided original onto a plurality of sheets of paper, it is sufficient to feed the original twice for each copying process. On the other hand, when copying images of a double-sided original onto both sides of a sheet of paper, the original is fed once each time the sheet of paper is fed to the copying process section 26. Thereby, during the second copying process, it is possible to scan the image on the side opposite to the side on which the image was scanned in the first copying process.

Note that when a plurality of originals are placed on the original tray 4, each original is fed once again after the copying process for all the originals is completed for single-sided originals. In addition, in the case of multiple double-sided originals, the sheets on which one-sided images have been copied for all the originals are temporarily stored in the intermediate tray 32, and after the copying process for all the originals on one side is completed, the sheets are transferred from the intermediate tray. At the same time, the second document is fed.

(h1 Effects of the Invention According to this invention, the single-sided conveying means is enabled during single-sided copying work, and both the original feeding means and the original reversing feeding means are enabled for each copying process, and the original is loaded first. Documents can be ejected onto the document tray in the same state as they are placed.

In addition, during double-sided copying work, the double-sided conveying means is enabled, and the original feeding means and the original reversing feeding means are enabled in each of the two copying processes performed for one sheet of paper. The original is fed once in each copying process, and images are formed on different sides of the original in each copying process. In this way, the image of a single-sided original can be copied onto one side of the paper, and the image of a double-sided original can be copied onto both sides of the paper using a single original feeding path, which increases costs and increases the size of the device. It is possible to prevent complexity and reduce the frequency of failures and improve reliability.

[Brief explanation of drawings]

FIGS. 1A and 1B are flowcharts showing the operation of an automatic double-sided copying machine according to an embodiment of the present invention, and FIG. 2 is a schematic front cross-sectional view showing the configuration of the automatic double-sided copying machine.
FIG. 3 is a block diagram of the control section of the automatic double-sided copying machine. 2-feeding belt, 3-feeding roller, 4-document tray, 5-discharge port-ra, 6-document cylinder, 9-feeding guide, 32-intermediate tray, 33-switch hack conveyance path.

Claims (1)

[Claims] (1) In an automatic duplex copying machine equipped with a single-sided conveying means that guides the paper once passed through the copying process section to the paper ejection section, and a double-sided conveying means that reverses the front and back sides and guides the paper again to the copying process section, A document feeding device that guides the documents on the tray one by one from the bottom to the image scanning section, and a document discharging device that reverses the front and back of the document that has passed through the image scanning section and discharges it from above to the document tray. and an original reversing feeding means that guides the original ejected to the original tray to the image scanning unit again; and enabling the original feeding means and the original reversing feeding means for each copying process when the single-sided conveying means is enabled. When the one-sided original copying means and the two-sided conveying means are enabled, the original feeding means is enabled the first time paper is fed to the copying process section, and the document feeding means is enabled the first time paper is fed to the copying process section. An automatic double-sided copying machine comprising: double-sided original copying means for enabling a reverse original feeding means.