JP2006248717A - Document conveyance device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document conveyance device capable of surely returning the rear end of a delivered document to an end fence. <P>SOLUTION: This document conveyance device is used for conveying a document 1 from a document mounting part to an image reading position and for delivering the document1 after reading it onto a catch tray 15 by a delivery roller 12 and a delivery lower driven roller 12a. The document conveyance device includes a driving device for rotatably driving the delivery lower driven roller 12a in a direction for delivering the document 1, and the end fence 19 for aligning the document delivered onto the delivery tray 15. The delivery lower driven roller 12a rotatably driven by the driving device moves from a delivery position for delivering the document 1 to a contact position coming into contact with the document 1 delivered onto the delivery tray 15 and contacts the document 1 delivered onto the delivery tray 15 to make the rear end of the document 1 reach the end fence 19. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a document conveying apparatus that is applied to a copying machine, a facsimile, a scanner, and the like, conveys a document from a document placement unit to an image reading position, and discharges the document to a document discharge unit.

As a conventional document conveying device, a pair of members that hang from the document discharge source side to the document discharge destination side on the lower surface of the member that vertically partitions the document feed unit and the document discharge unit. A guide member is provided so as to be pivotable in the vertical direction, and the tip of one guide member is provided so as to hang down from the other guide member to the document discharge source side. Therefore, even if there are curls at the leading edge or the leading and trailing edges of the document, a document that can be neatly stacked is known (for example, see Patent Document 1).
In such a document transport device, the curling of the document can be prevented, but the document cannot be aligned because the document cannot be abutted against the end fence.

Therefore, as a document transport device that solves the above-described problems, the output tray on which the discharged document is discharged is tilted so that the rear end of the discharged document abuts against the end fence so that the discharged document is aligned. There is something that was made.
JP 2002-2111814 A

  However, in the conventional document conveying device, the trailing edge of the discharged document cannot be surely returned to the end fence due to friction between the discharged document and the discharge tray, so that the discharged document cannot be aligned. There was a problem.

  The present invention has been made to solve such a problem, and provides a document conveying device that can reliably return the trailing edge of a discharged document to the end fence.

  The document transport device of the present invention is a document transport device that transports a document from a document placement unit to an image reading position and discharges the document after reading onto a discharge tray by a discharge roller. It has a configuration in which it moves between a paper discharge position for discharging the original and a contact position for contacting the original discharged on the paper discharge tray.

  With this configuration, the discharge roller can be moved by moving the discharge roller to a contact position where the discharge roller contacts the document discharged on the discharge tray. You can return to the end fence.

  In addition, the document conveying device of the present invention includes a driving device that rotationally drives the discharge roller in a direction in which the document is discharged, and an end fence for aligning the documents discharged on the discharge tray. A paper discharge roller that is rotationally driven by the driving device moves from the paper discharge position to the contact position and contacts a document that is discharged onto the paper discharge tray so that the trailing edge of the document is placed on the end fence. It has the structure to reach.

  With this configuration, the discharge roller contacts the discharged document while rotating, so that the trailing edge of the discharged document can be reliably returned to the end fence.

  In addition, the document conveying device of the present invention includes a sheet discharge sensor that detects a trailing edge of the document, and the sheet discharge roller is configured such that the sheet discharge position is detected after the document trailing edge is detected by the sheet discharge sensor. To the contact position.

  With this configuration, the discharge roller can be moved after the document is reliably discharged.

  The document conveying device of the present invention has a configuration in which the sheet discharge roller moves from the contact position to the sheet discharge position after the trailing edge of the document reaches the end fence.

  With this configuration, since the paper discharge roller returns from the contact position to the paper discharge position, the next original can be discharged.

  In the document conveying device of the present invention, the discharge roller is moved to the discharge position before the front end of the document discharged next to the document is detected by the discharge sensor. have.

  With this configuration, the discharge roller returns from the contact position to the discharge position before the next original is detected by the discharge sensor, so that the next original can be reliably discharged.

  In the document conveying device of the present invention, the discharge roller contacts the document discharged on the discharge tray at least twice.

  With this configuration, the trailing edge of the discharged document can be reliably returned to the end fence.

  As described above, the present invention provides a document conveying device that can reliably return the trailing edge of a discharged document to the end fence.

Hereinafter, a document conveying device according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a first embodiment of an original conveying apparatus according to the present invention, and shows an example in which a double-sided sheet-through type original conveying apparatus is mounted on an image reading apparatus.

  In FIG. 1, a contact glass 10a and a slit glass 10b having a smaller area than the contact glass 10a are provided on the upper surface of a main body 26 of an image reading apparatus such as a copying machine, a facsimile machine, a scanner device, or a multifunction machine.

  A document transport device is provided on the upper portion of the main body 26. The document transport device can be opened and closed so as to open and close the contact glass 10a and the slit glass 10b via a hinge mechanism (not shown).

  Further, a document table 2 as a document placement table is provided at the upper part of the document conveying device, and the leading end of the document bundle stacked on the document table 2 with the first image surface facing upward is a paper feed guide plate 3. It is positioned by hitting it.

  The bottom plate 4 is raised in the direction of arrow A by a solenoid (not shown) in response to a paper feed start signal from the main body 26 so as to press the original bundle against the calling member 5 from below.

  The calling member 5 conveys the original bundle to a separation sheet feeding unit having a sheet feeding belt 6 and a separation roller 7.

  The paper feed belt 6 and the separation roller 7 separate the original 1 at the top of the original bundle and convey it to a first conveyance path C having a pull-out roller 8 and a pull-out driven roller 8a. .

  The pull-out roller 8 and the pull-out driven roller 8a are configured to convey the document 1 onto the slit glass 10b.

  Further, a registration sensor 9 is provided in the first transport path C so as to detect the leading and trailing edges of the document 1. Thereby, it is possible to match the timing of the passage of the leading edge of the document 1 on the slit glass 10b and the start of image reading. It should be noted that if the leading edge of the document 1 is not detected by the registration sensor 9 after a certain period of time has elapsed since the document 1 was conveyed to the separation sheet feeding unit, it is determined that a jam has occurred.

  Further, the document 1 whose image information has been read on the slit glass 10b is transported to a second transport path D having an auxiliary roller 11, an auxiliary driven roller 11a, a paper discharge roller 12, and a paper discharge driven roller 12a. .

  The paper discharge roller 12 and the paper discharge driven roller 12a discharge the original 1 onto the paper discharge tray 15, or pass through the third conveyance path E having the reverse roller 16 and the reverse driven roller 16a. It is conveyed on the tray 17.

  In addition, a paper discharge sensor 13 is provided in the second transport path D so as to detect the leading and trailing edges of the document 1. If the leading edge of the document 1 is not detected by the paper discharge sensor 13 even after a predetermined time has elapsed after the trailing edge of the document 1 is detected by the registration sensor 9, or the leading edge of the document 1 is detected by the paper discharge sensor 13. If the trailing edge of the document 1 is not detected even after a predetermined time has elapsed, it is determined that a jam has occurred.

  Further, a switching claw 14 is provided on the extension of the second transport path D, and can be switched to either the position B or B ′ by a solenoid (not shown).

  Further, the reverse roller 16 and the reverse driven roller 16 a are configured to convey the document 1 onto the intermediate tray 17. Further, the reverse roller 16 and the reverse driven roller 16a are driven to rotate in the opposite direction to the case where the document 1 is transported onto the intermediate tray 17, and have a fourth transport path F having the paper discharge roller 12 and the paper discharge driven roller 12b. It is designed to be transported.

  A reversing sensor 18 is provided in the third transport path E so as to detect the leading edge of the document 1. If the leading edge of the document 1 is not detected by the reversing sensor 18 even after a predetermined time has elapsed after the trailing edge of the document 1 is detected by the paper discharge sensor 13, it is determined that a jam has occurred.

  The operation of the document feeder as described above will be described.

  First, when a document bundle is placed on the document table 2 with the first image surface facing upward, the bottom plate 4 is raised in the direction of arrow A by a solenoid (not shown) in response to a paper feed start signal from the main body 26, The bundle is pressed against the calling member 5 from below.

  The pressed document bundle is conveyed by the calling member 5 to a separation sheet feeding unit including a sheet feeding belt 6 and a separation roller 7 and separated one by one from the top. The separated document 1 is transported on the slit glass 10b through the first transport path C.

  Here, regarding the operation after the image information of the first image surface of the document 1 is read on the slit glass 10b, in the case of reading only the first image surface (single-sided mode), the first image surface and the second image surface This will be described separately in the case of reading (double-side mode).

  In the case of reading only the first image surface (single-sided mode), the document 1 is read from the image information of the first image surface on the slit glass 10b, and then the auxiliary roller 11, the auxiliary driven roller 11a, the paper discharge roller 12, The paper is discharged onto the paper discharge tray 15 through the second conveyance path D having the discharge lower driven roller 12a.

  In the case of reading the first image plane and the second image plane (double-side mode), the document 1 is conveyed to the second conveyance path D after the image information of the first image plane is read on the slit glass 10b. Next, the switching claw 14 is operated by a solenoid (not shown) when the leading edge of the document 1 is detected by the paper discharge sensor 13 or when a predetermined time has elapsed after the trailing edge of the document 1 is detected by the registration sensor 9. The document 1 is lowered to the position B ′, and the document 1 is conveyed on the intermediate tray 17 through the third conveyance path E. The switching claw 14 releases a solenoid (not shown) after a time from when the trailing edge of the document 1 is detected by the paper discharge sensor 13 until the trailing edge of the document 1 reaches the switching claw 14 elapses. To return to the position B. After the switching claw 14 returns to the position B, the reverse roller 16 rotates in the reverse direction, and the leading edge of the document 1 conveyed on the intermediate tray 17 enters the nip between the paper discharge roller 12 and the paper discharge driven roller 12b. . Then, the document 1 passes through the fourth transport path F and the first transport path C, and the image information on the second image surface is read on the slit glass 10b.

  After the image information of the second image surface is read on the slit glass 10b and the document 1 is discharged onto the discharge tray 15 in this state via the second transport path D, the second image surface is Since the paper is discharged downward onto the paper discharge tray 15, the pages of the original bundle are out of order. Accordingly, the document feeder operates as follows so that the document 1 is discharged onto the discharge tray 15 with the first image surface facing downward.

  The switching claw 14 is lowered to the position B ′ by a solenoid (not shown) after the document 1 is read on the slit glass 10b and the image information of the second image surface is read. It is conveyed onto the tray 17. Then, after the switching claw 14 returns to the position B, the reverse roller 16 rotates in the reverse direction, and the document 1 passes through the fourth transport path F, the first transport path C, and the second transport path D, and the paper discharge tray 15. Paper is discharged to the top.

  Next, an operation when the document 1 is discharged onto the discharge tray 15 will be described with reference to FIGS.

  2 to 5 are diagrams showing a paper discharge operation in the first embodiment of the document conveying device according to the present invention. FIG. 6 is a timing chart showing the paper discharge operation in the first embodiment of the document feeder according to the present invention.

  First, when a predetermined time has elapsed after the trailing edge of the document 1 is detected by the paper discharge sensor 13, the trailing edge of the document 1 passes through the paper discharge roller 12 and the paper discharge driven roller 12a as shown in FIG. .

  At the same time as or after the trailing edge of the document 1 passes through the paper discharge roller 12 and the paper discharge driven roller 12a, the paper discharge driven roller 12a has a fulcrum 21 in the direction of the arrow 23a as shown in FIG. By moving, it moves in the direction of the arrow 22a. At this time, at the same time as or after the under-discharge driven roller 12a starts to move, the under-discharge driven roller 12a is rotated by a driving device (not shown). For example, when the original 1 is discharged, the lower discharge roller 12a is rotated by the rotation of the discharge roller 12. Then, the auxiliary driven roller 11a is rotated by a driving device (not shown) at the same time as or after the driven roller 12a under the paper discharge starts to move, and the driven roller 12a under the paper discharge is illustrated in the drawing of the auxiliary driven roller 11a. It is configured to rotate when a driving force is applied by the driving means that does not.

  Then, as shown in FIG. 4, the lower discharge roller 12a moves in the direction of the arrow 22b by moving the fulcrum 21 in the direction of the arrow 23b, and the original 1 discharged onto the discharge tray 15 is discharged. And the rear end of the document 1 is returned to the end fence 19.

  Then, until the leading edge of the next original 1a reaches the paper discharge sensor 13, the driven roller 12a under the paper discharge moves in the direction of the arrow 22c as the fulcrum 21 moves in the direction of the arrow 23c as shown in FIG. Move back to the original position. The paper discharge driven roller 12a is configured to return to the original position when a predetermined time elapses after the trailing edge of the document 1 is detected by the paper discharge sensor 13, for example.

  The discharged roller driven roller 12a stops its rotation after returning the trailing edge of the discharged document 1 to the end fence 19 and returning to the original position. The above operation is repeated for each original.

  According to the document conveying device in this embodiment, the driven roller 12a under discharge is moved to the contact position where it contacts the document 1 discharged onto the discharge tray 15, and rotates on the document 1 while rotating. Therefore, the rear end of the document 1 can be reliably returned to the end fence 19.

In the present embodiment, the number of times that the paper discharge driven roller 12a contacts the document 1 is one, but the present invention is not limited to this and may be two or more.
(Second Embodiment)
FIGS. 7 to 10 are views showing a paper discharge operation in the second embodiment of the document conveying device according to the present invention. FIG. 11 is a timing chart showing the paper discharge operation in the second embodiment of the document feeder according to the present invention. In the present embodiment, since the operation when the document 1 is discharged onto the discharge tray 15 is characteristic, the operation will be particularly described.

  First, when a predetermined time elapses after the trailing edge of the document 1 is detected by the paper discharge sensor 13, the trailing edge of the document 1 passes through the paper discharge roller 20 and the paper discharge lower driven roller 20a as shown in FIG. .

  As shown in FIG. 8, the discharge roller 20 moves in the direction of the arrow 25a with the fulcrum 24 as a fulcrum as shown in FIG. To do. At this time, the discharge roller 20 is rotated by a driving device (not shown) at the same time as or after the discharge roller 20 starts to move.

  The paper discharge roller 20 comes into contact with the original 1 discharged onto the paper discharge tray 15 and returns the rear end of the original 1 to the end fence 19 as shown in FIG. It moves and touches the original 1 again, and the rear end of the original 1 is returned to the end fence 19.

  By the time the leading edge of the next original 1a reaches the paper discharge sensor 13, the paper discharge roller 20 returns to the original position by moving in the direction of the arrow 25c with the fulcrum 24 as a fulcrum as shown in FIG. . For example, the paper discharge roller 20 is configured to return to the original position when a predetermined time elapses after the rear end of the document 1 is detected by the paper discharge sensor 13. The above operation is repeated for each original.

  According to such a document conveying device in the present embodiment, since the paper discharge roller 20 contacts the document 1 twice, the rear end of the document 1 can be reliably returned to the end fence 19.

  In the present embodiment, the number of times the paper discharge roller 20 contacts the document 1 is set to 2 times, but the present invention is not limited to this, and may be 1 time or 3 times or more. Good.

  In the embodiment of the present invention, the double-sided sheet-through type document feeder is used, but the same effect can be obtained even with a single-sided sheet-through type document feeder.

  In addition, this embodiment shows a preferable one, and it is needless to say that the operation or driving method of the discharge roller and the driven roller under discharge is not limited to those skilled in the art. Various alternatives, modifications, variations, and improvements can be realized from the contents of the present invention, and these are included in the scope defined by the claims of the present invention.

  As described above, the document conveying device according to the present invention has the effect of reliably returning the trailing edge of the discharged document to the end fence, and is applied to a copying machine, a facsimile, a scanner, etc. This is useful as a document conveying device that conveys the image from the placement unit to the image reading position and discharges it to the document discharge unit.

1 is a schematic configuration diagram showing a first embodiment of a document conveying device according to the present invention. FIG. 5 is a diagram illustrating a paper discharge operation in the first embodiment of the document conveying device according to the present invention. FIG. 5 is a diagram illustrating a paper discharge operation in the first embodiment of the document conveying device according to the present invention. FIG. 5 is a diagram illustrating a paper discharge operation in the first embodiment of the document conveying device according to the present invention. FIG. 5 is a diagram illustrating a paper discharge operation in the first embodiment of the document conveying device according to the present invention. 3 is a timing chart showing a paper discharge operation in the first embodiment of the document feeder according to the present invention. It is a figure which shows the paper discharge operation | movement in 2nd Embodiment of the document conveying apparatus which concerns on this invention. It is a figure which shows the paper discharge operation | movement in 2nd Embodiment of the document conveying apparatus which concerns on this invention. It is a figure which shows the paper discharge operation | movement in 2nd Embodiment of the document conveying apparatus which concerns on this invention. FIG. 10 is a diagram illustrating a paper discharge operation in the second embodiment of the document conveying device according to the present invention. 10 is a timing chart showing a paper discharge operation in the second embodiment of the document feeder according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Original 12, 20 Paper discharge roller 12a, 20a Paper discharge lower driven roller 13 Paper discharge sensor 15 Paper discharge tray 19 End fence

Claims (6)

In a document transport device that transports a document from a document placement unit to an image reading position and discharges the document after reading onto a discharge tray by a discharge roller.
The document conveying device, wherein the sheet discharge roller moves between a sheet discharge position for discharging a document and a contact position for contacting the document discharged on the sheet discharge tray. A driving device that rotationally drives the paper discharge roller in a direction of discharging the original;
An end fence for aligning documents to be discharged onto the discharge tray;
A paper discharge roller that is rotationally driven by the driving device moves from the paper discharge position to the contact position, contacts the document discharged on the paper discharge tray, and uses the trailing edge of the document as the end fence. The document conveying device according to claim 1, wherein the document conveying device is reached. A paper discharge sensor that detects the trailing edge of the document,
3. The document conveying apparatus according to claim 2, wherein the sheet discharge roller moves from the sheet discharge position to the contact position after the trailing edge of the document is detected by the sheet discharge sensor.   4. The document conveying apparatus according to claim 3, wherein the sheet discharge roller moves from the contact position to the sheet discharge position after the trailing edge of the document reaches the end fence.   5. The discharge roller according to claim 4, wherein the discharge roller is moved to the discharge position before a front end of a document to be discharged next to the document is detected by the discharge sensor. Document transport device.   6. The document conveying apparatus according to claim 1, wherein the sheet discharge roller contacts the document discharged on the sheet discharge tray at least twice.

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