JPH028162A - Control device for original automatic transfer device - Google Patents

Abstract

PURPOSE:To cutback a loss time accompanied by the reverse operation of the succeeding original and to shorten an integral picture image reading time by performing the original reverse operation during picture image reading or during the original changing in the automatic original transfer device of a copying machine, etc. CONSTITUTION:When the copy starting key of a copying machine M is turned ON, an original bundle S is fed to separation parts 9, 10 by a paper feeding roller 7 and separated and fed one by one from the lowermost position. The original S of the lowermost position in case of both faces copying is passed through a reverse route 19 along the outer periphery of the reverse roller 15 by passing a roller 21 and placed on a platen 2 by passing the roller 21 again. The original S is then returned to the left part by the reverse rotation of a belt 3 after completion of its exposure and placed on the platen 2 again along the outer periphery of the reverse roller 15 by passing thru a paper discharging route 16. So, the 3rd page is placed on the platen 2 downward. Then, the picture image reading of the surface is performed and simultaneously the reverse operation of the succeeding original S is performed and the completion of the picture image reading of the 1st sheet is awaited at the position of the roller 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling an automatic document feeder of an image forming apparatus such as a copying machine or a laser beam printer.
The present invention relates to a method of controlling a circulation-type automatic document feeder that transports documents in a circular manner between a document stacking table and an exposure section of an image forming apparatus.

[Conventional technology] Conventionally, in general? The ring-type automatic document feeder sequentially feeds the stack of documents set on the document stacking table from the f-most document.
The sheets are separated one by one and transported and placed on the exposure section of an image forming apparatus such as a copying machine, and after the exposure is completed, they are returned to the original v1 mounting table. The apparatus is configured to repeat a desired cycle, with repetition for the number of originals in the bundle of originals as one cycle.

[Problem to be solved by the invention] When handling double-sided originals with a conventional automatic document feeder, it is necessary to start reading images from the back side of the lowest original, or to do so, it is necessary to partially move the lowest original onto the platen glass. After the original is transported, the original is reversed by the original reversing mechanism, and then the original is transported onto the platen glass again to start image reading.

In this method, the above-mentioned operation is always performed when exchanging originals, and this time becomes wasted time, which is detrimental to shortening the overall copying time.

[Means for Solving the Problem] The purpose of the present invention is to reduce the loss time when reversing the original, which is the above-mentioned drawback, and is characterized in that the original reversing operation is performed during image reading or during original exchange. That is.

[Examples] Examples of the present invention will be described below with reference to the drawings.

As shown in FIG.
The conveyor belt 3 is disposed facing the M platen 2 and is wound around a driving roller 3a and a driven roller 3b. A document stack 5 is arranged above the conveyor belt 3, on which a document bundle consisting of a plurality of documents S constituting a document stacking section can be stacked. Further, a recycle lever 6 is disposed on the document stacking table 5, and the recycle lever 6 divides the document S stacked on the document stacking table 5 into an unprocessed document and a processed document. It will be done.

Further, a half-moon-shaped paper feed roller 7 is disposed at the base end 5a of the document stacking table 5, and further downstream of the paper feed roller, there is a separation section consisting of a separation section conveyance roller 9 and a separation belt IO. or is arranged. A stack of originals S... stacked on the original stacking table 5 is fed by a paper feed roller 7 toward separation units 9, 10, and is moved between a separation unit transport roller 9 rotating in the original feeding direction and a separating unit transport roller 9 rotating in the original returning direction. A rotating separation belt 10 sequentially separates and feeds the documents one by one starting from the lowest document S. A paper feed stopper 11 is provided between the paper feed rollers 7 and the separating portions 9 and 10, and when the document bundle S... is set, it is located at the solid line position to position the leading edge of the document and to stop the document from being fed. During feeding, the stopper solenoid is energized to move to the position shown by the broken line. Furthermore, the separation section 9. A paper feed path 13 is provided from downstream of the lO to the conveyor belt 3, and the document S sent out from the separating section 9.10 is fed to the paper feed path 13.
The document is fed between the conveyor belt 3 and the platen 2 through a flapper 30 that switches between the path onto the platen and the path to the document reversing mechanism, and is placed at a predetermined position on the platen 2. . A reversing roller 15 is disposed near the paper feeding path 13. Further, a paper ejection path 16 extending from the conveyance belt 3 to the document stacking table 5 along the outer periphery of the reversing roller 15 is provided. The document S placed at a predetermined position on the platen 2 is again conveyed in the reverse direction, passes through the paper discharge path 16, and is transferred to the document stacking table 5 by a paper discharge roller 17 provided at the downstream end of the paper discharge path 16. ni a! ! The document is discharged to the top of the stack of originals S. Furthermore, the paper ejection path 16 branches off above the reversing roller 15 and forms a paper feed path 13.
A reversal path 19 is arranged which merges with the . A flapper 20 for switching the document transport path is disposed at the branching point between the reversing path 19 and the paper ejecting path 16. When ejecting the document, the flapper 20 guides the document toward the document stacking table 5 at the solid line position and reverses the document. At times, the flapper solenoid is energized to displace the document to the position indicated by the broken line and guide the document along the reversing path 19 toward the platen 2. Further, a conveyance roller 21 is disposed downstream of the confluence of the paper feed path 13 and the reversing path 19, and the paper feed path 13
, or so that the document S guided to the reversing path 19 is conveyed toward the platen 2.

Here, a description will be given of the operation of conveying a double-sided original, in which the next original is fed by the reversing feeding means while the image is being read, and is held on standby by the registration rollers 21.

The operator places the stack of originals S to be copied face up on the original stacking table 5 (by tapping the stack from the top), inputs the duplex mode from the operation panel of the copying machine M, and presses the copy start key. When turned on, the document bundle S is fed to the separating section 9, 10 by the feed roller rough. Next, the document bundle S... is separated and fed one by one by separation units 9 and 10 starting from the lowest one.

In the case of double-sided copying, image reading must start from the back side (fourth page) of the lowest original, so the flapper 30 that switches the path onto the platen glass 2 and the path to the reversing roller 15 is indicated by a solid line. As shown, the path is switched to the reversing roller 15, and the document S passes through the roller 21, along the outer periphery of the reversing roller 15, passes through the reversing path 19, passes through the roller 21 again, and is placed on the platen 2. (4th page or face down). At this time, the flapper 30 is at the broken line position. After exposure, the original S is returned to the left by reversing the belt 3, passes through the paper ejection path 16, and is again placed on the platen 2 along the outer periphery of the reversing roller 15 in order to read the surface image. .

Therefore, the third page is placed on the platen 2 facing downward. Next, the image on the front side is read, but at the same time, the next original is reversed in order to read the image on the back side of the next original. The conveyance operation is carried out along the same path as the first document, or the document that has been reversed along the reversing roller 15 is conveyed along the registration roller 21 (the trailing edge of the next document) to finish reading the image on the front surface of the first sheet. It will stop when it exits)
Wait at the position. (The leading edge of the next document is on registration roller 2.)
1 and is restrained. ) Then, as soon as the image on the front side of the first sheet has been read, the first sheet of the original is transferred to the paper ejection path 16.
At the same time, the registration rollers 21 are rotated to place the second original onto the platen 2. do.

The subsequent operation is a repetition of the above-mentioned operation.

With the above-described operation, it is possible to eliminate the lost time spent in reversing the original to read images from the back side of the original, except for the first sheet (lowest original).

In the case of a long document, the trailing edge of the next document and the leading edge of the document discharged from the platen may overlap, or the document to be discharged is fed by the feeding force of the belt 3, so that the document can be discharged smoothly.

Further, even if the flapper 20 is switched downward while the next document is being fed by the rollers 15, there is no fear of damage if the force is kept weak. Therefore, the document to be ejected is guided by the flapper 20 and ejected from the path 16 via the rollers 17 onto the mounting table 5.

Next, the control flow of the above operation is shown in FIG.

First, wait for the copy key to be pressed (2-1), and when the copy key is pressed, switch the flapper 30 to the reverse path side (2-2), and feed the lowest original from the original stacking table 5 ( 2-3). The fed document is sent along the reversing roller 15 according to the above-described operation and stopped at the registration roller 21. Wait for the document to be reversed (2-4), and then switch the flapper 30 to the platen path side (2-5).
, Rotate the registration roller 21 by the length of the document (2-6). Then, it waits until the document is completely placed on the platen (2-7), and after the document is completely placed, a request is made to the main body M to start image reading (2-8). The main body waits for the image reading to be completed (2-9), and after the reading is completed, the flapper 30 is switched to the reverse side (2-10), and the document on the platen is ejected (2-11). The document discharged from the platen is then reversed along a reversing roller 15 and stopped by a registration roller 21. Wait for the completion of this reversal (2-12), and after the reversal is completed, the registration roller 21 is rotated by the length of the document (2-13). Thereafter, it waits until the document is completely placed on the platen (2-14), and after the document is completely placed, it is determined whether or not it is the final document (2-15).

If it is not the final document, the flapper 30 is switched to the reverse path side (2-16), and the next document is fed from the document table (2-17). (Also, if it is the final document, the feeding operation for the next document is not performed.) Next, an image reading request is made to the main body M (2-18), and after the main body finishes reading the image (2-19 ), the flapper 2o is switched to the ejection side (2-20), and the document on the platen is transferred to the roller 15 and the hash 16. A discharge operation is performed via the roller 17 (2-12). And judge the final manuscript 2-2
2) If it is not the final document, since feeding and reversing have already been completed, the process moves to step (2-4) where the process waits for the next document to complete reversing, and this process is repeated thereafter. If it is the final document, the process ends after waiting for the document to be returned to the document stacking table 5.

Next, a case will be described in which a single-sided copy is obtained from a single-sided original.

The originals are placed on the mounting table 5 with their image surfaces facing upward, and the originals are separated and fed one by one starting from the lower originals. The separated originals are on bus 13.
, roller 21, and belt 3, and is placed on the platen. When viewed from the state of the mounting table 5, the front and back sides are reversed,
The image plane is placed on the platen 2 facing downward. After the image plane has been read, the original is ejected from the platen by the reverse rotation of the belt 3, and is returned to the mounting table 5 through the roller 15, path 16, and roller 17. At this time, the front and back sides of the document are turned over again and returned to their original state.

Next, a means for controlling the movement of the rollers will be explained. Sensor S1 detects the leading edge of the separated document,
After a predetermined period of seconds, the rotation of the roller 9 and the belt 10 is stopped. As a result, the document is transferred to the roller 21 with a loop formed.
is inhibited and stopped. The sensor S2 detects the trailing edge of the document for positioning, and stops the rotation of the belt 3 after a predetermined time. As a result, the rear end of the document is aligned with the reading reference position. The document is positioned. Further, in the case of a one-sided original, the second detection causes the sensor S2 to start feeding the next original. Further, by detecting the rear end of the discharged document, the sensor S2 starts the rotation of the roller 21. The sensor S3 detects the leading edge of the reversed document and stops the rotation of the roller 15 after a predetermined time. The document is stopped by the roller 21 in a loop state. The sensor s4 detects the rear end of the document discharged onto the mounting table 5, and after a predetermined time, the rollers 21 and 15 are rotated to convey the next document again.

In addition, FIG. 3 is a block diagram that controls the rotation of the belt system and paper feeding system. Ml is a belt system motor, and M2 is a paper feed system motor.

cfl is a transmission system including a clutch, which reverses and transmits the rotation of the motor M2 or stops it.

Next, referring to FIG. 4, a configuration for allowing a document to be discharged to pass above the next document will be explained. Reference numeral 50 denotes an elastic plate, one end of which is fixed to the flapper 3o. Therefore, the next document remaining around the roller 15 is bent upward by the elastic plate 30. In this state, when the document to be discharged is conveyed by the belt force, the leading edge of the document pushes this elastic plate 50 away. Therefore, the ejected original is placed on top of the next original. Furthermore, if the rollers 51 and 52 are set aside by the discharged document, the document can be smoothly discharged by the force of the belt 3 even if the roller 15 does not rotate.

As described above, according to the embodiment of the present invention, the case where the document is guided to the platen through a partial reversal pass without being turned over is shown, but the present invention is not limited to this. For example, in a device that is led to a platen with its front and back reversed, it may be made to stand by with its front and back reversed.

[Effects of the Invention] According to the above invention, when performing image reading of a double-sided original, the loss time associated with the reversal operation of the next original is reduced, and the overall image reading time is shortened.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the automatic document feeder. FIG. 2 is a control flowchart of operations according to the present invention, FIG. 3 is a block diagram, and FIG. 4 is a partially enlarged view of FIG. 1. Ml...Motor M2...Motor 13...Pass 15...Roller 3...Belt 16...
bus

Claims (1)

[Claims] (1) a document placement means; a feeding device for separating and feeding the documents on the document placement device; a first sheet path for guiding the separated and fed documents toward a reading position; and a first sheet path for guiding the separated and fed documents toward a reading position; a second sheet path that guides the fed document toward the reading position with the fed document in a front and back state different from the first sheet path; In the sequence of leading the original from the original to the reading position, the next original is separated and fed while the preceding original is at the reading position and is kept waiting in the second sheet path. Control method for automatic conveyance equipment.