JPS624158A - Original copy reversing and transferring device - Google Patents

Abstract

PURPOSE:To make it possible to reverse and transfer an original copy with a simple arrangement, by providing, in a reversing path, a stopper which regulates the leading end of the original copy that is led to the reversing path after completion of image scanning, and which then curves the original copy and transfers the same to an original copy scanning position. CONSTITUTION:An original copy 5 is transferred to an original copy wind-up drum 1 by way of first and second transfer paths 9, 10. Then the original copy 5 is transferred to an original copy scanning position, being clamped by pawls 4. After completion of scanning of the original copy, the original copy 5 is removed from the drum 1 and is then led to a third path 11. Then, the original copy 5 is led to a reversing path 18 by the transfer forces of a driven roller 14 and a transfer roller 12, and is then curved upward since the transfer of the leading edge of the original copy 5 is limited by a stopper 20. Then, due to a recovering force of the original copy 5 caused by the curving, the trailing end of the original copy 5 is led into between the driven roller 13 and the transfer roller 12 to be clamped therebetween, and therefore, is transferred to the drum 1 with the original copy being upside down. With this arrangement, it is possible to eliminate the provision of a reversing and transferring means, a change-over gate. etc., and therefore, the original copy reversing mechanism may be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field: The present invention relates to an apparatus for copying double-sided originals, and to an apparatus for reversing and conveying such originals.

<Prior Art> In order to copy an image of a document, there is an automatic document feeder that automatically transports the document to a scanning position and discharges the document from the scanning position after scanning the image.

This device is intended for copying single-sided originals, and cannot copy double-sided originals. Therefore, in order to copy a double-sided document, a configuration is adopted in which after copying one side of the document, the document is reversed and sent to the scanning position again. Therefore, a reversing mechanism for reversing the original, a transport path for sending the reversed original to the original scanning position again, and a transport mechanism are required, which not only increases the size of the device but also complicates its structure. Ta.

In particular, a reversing mechanism that reverses the front and back sides of a document is equipped with a switching gate, etc. to reverse the document, and by controlling this switching gate, the document is guided to a reversing conveyance path, etc., and the reversed document is moved to the scanning position. The configuration is extremely complicated, including the control of switching gates and the like.

<Objective> The present invention provides a document feeding device for copying double-sided documents, particularly a document reversing device having a simple configuration for inverting and conveying a document.

<Embodiment> FIG. 1 is a sectional view showing a specific example of a document reversing device according to the present invention. In the figure, reference numeral 1 denotes a document wrapping drum that wraps the document around its circumferential surface and conveys it to the scanning position 2, and 3 an illumination device that irradiates the scanning position 2 with light.

By being illuminated by the illumination device 3, reflected light from the document is projected onto a recording medium (not shown) via an optical system consisting of lenses, mirrors, and the like. The document wrapping is done on drum 1.
In order to wrap and hold the sent original on the circumferential surface, claws 4 are provided to sandwich the original. The claws 4 are opened while the drum 1 is stopped at the position shown in the figure, and are closed when the document reaches the gripping position of the claws 4. In particular, the pawl 4 is closed while the drum 1 is rotating, and is opened when the drum 1 faces the P2 or P3 position after scanning the original, and sends the original to the respective conveyance path.

The above-mentioned document wrapping is performed by wrapping the document 5 that is fed into the drum 1.
A large number of documents are placed on a document placement tray 6 placed at an appropriate location. The document tray 6 is provided with a paper feed roller 7 that feeds the documents 5 from the lower one and a separation roller 8 that prevents the document from being fed twice (double feeding). Between this document placement tray 6 and the document winding drum 1,
First and second conveyance paths 9 and 1o, which guide the document 5 formed by the guide plate and fed to the drum 1 for wrapping the document;
Original 5 sent from the drum side after scanning one side of
A third conveyance path 11 is formed that guides the toner to the reversal path. A conveyance roller 12 for conveying the document 5 to the position of the claw 4 of the drum 1 is provided at the relay portion of the first and second conveyance paths 9-10. This conveyance roller I
2 is also positioned on the third conveyance path 11, and sends the document sent from the drum 1 side to the reversing path. A driven roller 13 .opposed to the transport roller 12 for each transport path. +4 is provided.

In addition to the above-mentioned transport path, a fourth transport path 16 is formed to guide the original 5 sent when image scanning of the original 5 is completed to the paper ejection tray 15 on the original tray 6. There is. This fourth conveyance path! A paper discharge roller 17 is provided in the middle of the document 6 and feeds the document 5 to a paper discharge tray 15.

On the other hand, the third transport path 11 communicates with a reversing path 8 which reverses the document 5 and leads to the first transport path 9.

This reversing path 18 is formed so as to intersect with the first transport path 9 so as to also serve as a part of the first transport path 9 . In the reversing path 18, a stopper 20 is provided on a guide plate 19 that forms the path 18 to stop the leading edge of the document. The position at which this stopper 20 is provided is based on the relationship t>tl, where t1 is the reversal distance from the stopper 20 to the contact point between the transport roller 12 and the driven roller 13 relative to the length t of the document 5 in the feeding direction. It is set so that Therefore, the reversal distance phrase needs to be changed depending on the length of the document 5 in the feeding direction in order to maintain the relationship t>tl.

FIG. 2 is a perspective view showing a specific example for changing the reversal distance zl according to the length t of the original 5. In FIG.

In the figure, a stopper 21j is provided so as to be movable in the conveyance direction of the original 5 with respect to the guide plate 19.

A wire 22 that transmits the rotational force of a motor 21 to move the stopper 20 is fixed to the stopper 20 .

The wire 22 is connected to a pulley 24 fixed to a rotating shaft 23 of a motor 21 and a pulley 25 rotatably fixed to a fixed position.
The stopper 20 is moved left and right depending on the rotation direction of the motor 21. The motor 21 is
An encoder 26 is provided, and the rotational position of the motor 21 is detected by this encoder. Therefore, the position of the stopper 20 can be recognized from the output of the encoder 26.

In order to recognize the movement position of the stopper 20, the stopper 20 is returned to its initial position and moved from this initial position by a desired distance tx based on the output of the encoder 26. A position detection switch 27 is arranged at the initial position to detect when the stopper 20 reaches the initial position. This position detection switch 27 detects that the stopper 20 has returned to the initial position, stops the rotation of the motor 21, reverses the motor 2I, and moves the stopper 20 to the position corresponding to the length t of the original 5. move it. At this time,
Based on the position of the encoder 26 at the initial position of the motor 2I, if the moving distance tx from the initial position is determined, the encoder 2
The stopper 20 can be accurately moved by the distance tx in accordance with the output of 6.

The moving distance tx of the stopper 20 is from the stopper 20 to the transport roller 2 and the driven roller 1 relative to the length of the document t.
For example, if the distance tl is always shortened by a constant length IOm) with respect to the document t, then t1 = t-10. To determine the distance tx, tx=t-
C15+IO). In this formula, 68 is the distance from this position to the contact point between the conveyance roller 2 and the driven roller 3 when the stopper 20 is at the initial position.
Further, as a specific example of detecting the length t of the document 5, a detection switch 28 is arranged to detect the document 5 being conveyed into the second conveyance path IO. In particular, the detection switch 28 is disposed near the paper output portion of the transport roller 2 and the roller 13, and measures the length t of the document 5, and also controls the drive of the transport roller I2. The length t of the original document 5 caused by the detection switch 28 can be measured by counting the operating time of the detection switch 28 when the original document 5 is activated. In other words, the length t of the original 5 can be determined based on the time it takes for the original 5 to pass through the detection switch 28.

The operation of the document feeding device configured as described above will be explained below.

The original 5 to be copied is placed with its image side facing away from the original placing tray 6. In this placed state, when the paper feed roller 7 is driven, the placed originals 5 are fed from the lowest one and sent to the first conveyance path 9. In this case, the separation roller 8 sends the document 5 continuing at the bottom back to the document placement tray 6 side, thereby ensuring that one sheet is fed. The lowermost document 5 to be fed is fed along the first conveyance path 9 and sent to the contact portion between the conveyance roller 12 and the driven roller 13 . The document 5 is conveyed by the conveyance force of the paper feed roller 7 until it reaches the position of the conveyance roller 12 .

Transport roller! 2 is driven in synchronization with the paper feed roller 7 to feed the document 5 into the second conveyance path 10. At this time, the detection switch 28 provided in the second transport path IO
Detects the conveyance of The conveyor roller detects this! 2 is stopped, and the feeding of the document 5 is temporarily stopped. The reason why the document 5 is temporarily stopped is that the document winding is synchronized with the rotational position of the drum I, and in particular, the leading edge of the document 5 is held by the claws 4 at a fixed position.

The above document is wound on the drum I[, whose claw 4 is at the specified position P1.
It is stopped at that position by detecting that it has reached that position. As a means for detecting the rotational position of the drum 1, a conventionally known means is used, but it can be easily carried out by, for example, detecting a slit in a slit disk provided coaxially.

For document winding, the pawl 4 of the drum I is positioned at the specified position Pi, and if the drum 1 is in a stopped state, the pawl 4 is opened as shown in the figure and is on standby to grip the leading edge of the document 5. . In this document winding, if the drum 1 is positioned as shown in the figure, the transport roller 12, which has been temporarily stopped, is driven again, and the feeding of the document 5 is resumed. In this case, the drive of the paper feed roller 7 is stopped, and the next document 5 is not sent out. Further, the length t of the original 5 can be measured by counting the time from when the feeding of the original 5 is resumed until the detection switch 28 detects the trailing edge of the original 5.

The leading edge of the original 5, which is once again started to be transported by the transport roller 2, is sent to the position of the claw 4, and the claw 4 thereby clamps the leading edge of the original 5. After being clamped, the document wrapping drum 1 starts rotating, wraps the document 5 around the circumferential surface of the drum, and transports the document 5 to the document scanning position 2. The manuscript is wrapped in a drum! When scanning of the original according to the preset number of sheets is completed, the claw 4 is opened to eject the original 5. The opening position of the claw 4 for discharging the original 5 is when the claw 4 reaches the position P8 in the figure in order to guide the original 5 to the fourth transport path +6.

Therefore, the document 5 is guided to the fourth conveyance path 16 and is discharged onto the paper tray 15 via the paper discharge roller 17 .

The above is a description of the transport operation for a single-sided original. Next, the transport operation for scanning a double-sided original in the present invention will be described.

The originals 5 placed on the original tray 6 are fed one by one starting from the bottom one, and the originals are wrapped around the drum so that one image side (front side) is exposed. is maintained. The operation of winding the original 5 around the drum (2) is exactly the same as in the case of a single-sided original. In this case, the document 5 is on standby at the detection switch 28 position before being wrapped, and the length t is measured by the detection switch 28 detecting the trailing edge after restarting the conveyance. Based on this information, the distance tx of the stopper 20 from its initial position, the zero distance tx by which the stopper 20 is moved leftward in FIG. 2, is determined by the formula tX=t-(t,+ro). In addition to this, the stopper 20
l is set to be IOm shorter than the length tl of the document 5.

This operation is performed until the scanning of the original 5 wrapped around the drum IIc is completed. In order to scan the image on one side (the back side), the document 5 is removed from the drum 1. This removal is performed by opening the claw 4 of the drum 1 when the claw 4 of the drum 1 reaches the P2 position. As a result, the leading edge of the document 5 is guided to the third transport path 11 formed by each guide plate, without heading to the fourth transport path 16. Therefore, the third conveyance path 1
The conveyance roller 12 and the driven roller I4 arranged in the middle of 1
The original 5 is fed between the contact portions, and the original 5 is introduced into the reversing path 18 by the conveying force of the conveying roller 12.

Above reversal route! Since a stopper 20 is disposed at 8, the feeding of the leading edge of the original 5 is regulated. Here, the distance t1 of the stopper 20 is 1 with respect to the length t of the original 5.
The zero field is set short.

When the conveyance roller 12 sends out the document 5, if the leading edge of the document is regulated by the stopper 20 without the trailing edge of the document passing between the rollers 12 and 14, the document 5 is moved upward to the third position.
Send it out in a curved manner as shown in the figure. Even after the trailing edge of the document 5 is discharged by the conveying roller 12, the driving of the conveying roller 12 continues, and its conveying force moves the trailing edge of the document to the conveying roller as shown in FIG. 2 and driven roller I
It is sent between 3 and 3. At this time, since the original 5 is curved, the rear end of the original is held between the rollers 12 and 13 by the restoring force due to the curvature.

The image surface (front surface) of the document 5 that has just been scanned is the bottom surface, and the image surface (back surface) that will be scanned from now on is the top surface.
The image plane is reversed when the paper is fed by the paper feed roller 7.

When the rear end of the document 5 is bent, the rollers 12 and 13 are moved from the positions of the transport roller I2 and the driven roller I4.
In order to enhance the effect of feeding the material into the contact position with the material, the transport roller I2 is formed in the shape shown in FIG. 5, for example. As shown in the figure, the conveying roller 12 has saw-shaped uneven portions 12 - 1 formed on its surface parallel to the rotating shaft 29 . Therefore, the rear end of the document 5 is on the transport roller 12! Two uneven parts I
When the trailing edge of the document reaches the 9 o'clock position of the roller I2, the document is held by the conveyor roller I2 and guided between the contact portions of the rollers 12 and 13. and the roller 13.

Next, when the front and back sides of the document 5 are reversed and the document 5 is fed between the conveyance roller 12 and the driven roller 13 with the rear end facing forward, the document 5 is again transferred to the second position by the action of the conveyance force of the conveyance roller 12. It is transported to the transport path 10. The conveyance roller 12 is stopped by the detection signal from this post-conveyance detection switch 28.
The original 5 is placed at that position in an inverted state. Then, when the drum 1 releases the pawl 4 and stops at the specified position Pl, the driving of the conveying roller 12 is restarted, and the document winding is carried out.
is transported with its rear end facing forward and held by the claws 4. In this case, the side of the original 5 that was scanned first is the one that is on the drum 1.
is wound around the drum I so as to be in contact with the surface thereof, and the opposite surface thereof is sent to the scanning position 2 to be image scanned. here,
When the other side (back side) of the original 5 is scanned, when the leading edge (rear head) of the original 5 is detected by the detection switch 28, the next double-sided original 5 is transferred to the conveyance roller 12 by the action of the paper feed roller 7. When the scanning of the other side is completed as described above, the claw 4 is conveyed to the position of the detection switch 28 and stopped at that position. The document 5 is released and the grip on the document 5 is released. As a result, the original 5 is placed in the fourth position formed by the guide plate.
The document is guided to the conveyance path I6 and is discharged to the paper discharge tray 15 via the paper discharge roller 17. After this paper is discharged, the document is wrapped when the claw 4 of the drum 1 is at the P1 position, and the drum 1 is stopped. The next document 5, which is waiting in this state, is conveyed to drum 1 and the above-mentioned action is repeated. <Effect> According to the document reversing conveyance device of the present invention, the document is reversed after image scanning is completed. The reversing path is equipped with a stopper that guides the document to the document reversing path, restricts the leading edge of the document, curves the document, and guides the document to the document scanning position. Gates and the like are not required, and the document reversing mechanism becomes extremely simple.

Further, since the stopper is movably provided so that the distance from the stopper to the conveyance means is shortened with respect to the length of the document, accurate reversal conveyance can always be performed regardless of the length of the document.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a specific example of the document feeder according to the present invention, FIG. 2 is a perspective view showing details of the document reversing section according to the present invention, and FIGS. 3 and 4 are document sheets according to the present invention. FIG. 5 is a perspective view showing a specific example of the conveyance roller according to the present invention. I: Original wrapping is on drum 2: Original scanning position 5: Original
6: Original tray 7: Paper feed roller 9: First conveyance path
IO: Second conveyance path I■: Third conveyance path +2 = Conveyance roller 18: Reversing path 20: Stopper 21: Motor 27: Position detection switch 28: Original detection switch Agent Patent attorney Aihiko Fukushi (and 2 others) Z' Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A conveyance means including a conveyance path for conveying the document to the document scanning position, a reversing path for conveying and reversing the document after single-sided scanning, and a means provided in the reversing path for regulating and curving the leading edge of the document. What is claimed is: 1. A reversing and conveying device for a document, comprising: a stopper for guiding the document to the conveying means in the above-mentioned state; 2. The document according to claim 1, wherein the stopper is configured such that the distance from the stopper position to the conveyance means is set short relative to the length of the document in order to curve the document. Reversing conveyance device.