JP2010076897A - Document conveying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document conveying device enabling even thin documents to be easily set between a suction roller and a suction nip piece and capable of favorably conveying the documents. <P>SOLUTION: This document conveying device includes a supply tray 10 for placing the documents thereon, the suction roller 110 projecting from the lower side of the supply tray 10 and sucking the document on the supply tray 10, the suction nip piece 120 which is arranged so as to face the suction roller 110 and biased toward the suction roller 110 when the document on the supply tray 10 is sucked, and a retreating mechanism for retreating the suction nip piece 120 from the suction roller 110 when the documents are set on the supply tray 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a document conveying device that conveys a document from a supply tray.

  A document feeder such as an ADF (Auto Document Feeder) is provided with a separation roller that feeds and feeds documents to be read one by one, and a suction roller that brings the first document toward the separation roller. A suction nip piece faces the suction roller, and the suction nip piece is biased by a spring toward the suction roller. Accordingly, the document set on the supply tray is sandwiched between the suction roller and the suction nip piece, and an appropriate frictional force is applied between the document and the suction roller.

JP 2007-238252 A (FIG. 14)

  By the way, there are various types of papers to be conveyed to the document conveying device. When trying to set a very small number of originals made of very thin paper in the supply tray, even if you try to put the original between the suction roller and the suction nip piece, the original is weak and the suction nip piece is pushed with the original. The document could not be moved and the document could not be set. Also, the leading edge of the document may be bent or wrinkled and damaged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a document conveying device that can easily set a document between a suction roller and a suction nip piece even if it is a thin document, and can convey the document satisfactorily. .

  In order to achieve the above-described object, the document conveying device of the present invention includes a supply tray on which a document is placed, a suction roller that is arranged to protrude from below the supply tray, and sucks the document on the supply tray, and the suction A suction nip piece disposed opposite to the roller and biased toward the suction roller when the document on the supply tray is sucked, and the suction nip piece when the document is set on the supply tray. And a retracting mechanism for retracting from the suction roller.

  According to the document conveying apparatus configured as described above, the retracting mechanism is driven manually or electrically, and the suction nip piece is retracted from the suction roller during document setting, and the document is inserted between the suction nip piece and the suction roller. can do. Therefore, even a thin document can be conveyed satisfactorily.

  According to the document conveying device of the present invention, even a thin document can be easily set between the suction roller and the suction nip piece, and the document can be conveyed well.

[First Embodiment]
Next, a first embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is an overall perspective view of an original reading apparatus provided with an original conveying apparatus according to a first embodiment of the present invention, and FIG. 2 shows an original conveying apparatus according to the first embodiment of the present invention. 1 is a diagram illustrating an overall configuration of a provided document reading apparatus.

  Here, in the following description, the “conveying direction” is the direction in which the original is conveyed from the supply tray 10 toward the discharge tray 20 (the arrow direction in FIG. 2), and the “discharge direction” is the original conveying of the original. This is the direction in which the sheet is discharged from the section 30 to the discharge tray 20. Further, upstream and downstream in the transport direction and the discharge direction are simply referred to as “upstream” and “downstream”, respectively, and the width direction perpendicular to the transport direction and discharge direction of the document (the direction toward the front and the rear side in FIG. 2). ) Is simply referred to as the “width direction”.

  As shown in FIG. 1, the document reading apparatus 1 includes a supply tray 10 on which a document is placed and a discharge tray 20 from which the document is discharged. As will be described later, the document placed on the supply tray 10 passes through the reading position R (see FIG. 2), is optically read, and is conveyed to the discharge tray 20.

  A nip piece operation lever 122 for manually operating the suction nip piece 120 (see FIG. 2) is exposed on the front side wall of the document reading apparatus 1.

  As shown in FIG. 2, the document reading device 1 controls a flatbed scanner 2 having a known configuration, a document transport device 3 that transports the document M to the reading position R, and a reading operation and a transport operation of the document M. A control device 4 is mainly provided.

<Configuration of flatbed scanner>
The flatbed scanner 2 is mainly provided with a platen glass 2G that is disposed at the lower part of the document reading device 1 and serves as a document table on which the document M is placed, and an image sensor 2S (reading device). In the flatbed scanner 2, the image sensor 2S can read the document M placed on the platen glass 2G while scanning, and can read the document M conveyed to the reading position R.

<Configuration of document feeder>
The document conveying device 3 is a device that conveys the document M to the reading position R and can read one side or both sides of the document M, and is disposed above the flat bed scanner 2 and can be opened and closed with respect to the platen glass 2G. Is provided. The document transport device 3 mainly includes a supply tray 10 on which the document M is placed, a discharge tray 20 from which the document M is discharged, and a document transport unit 30 that transports the document M.

<Configuration of discharge tray>
The discharge tray 20 is disposed above the supply tray 10 and mainly includes a fixed tray 21 and a flap 22 disposed on the upstream side of the fixed tray 21.
The fixed tray 21 is fixed so as not to be displaced with respect to the document conveying unit 30.

  The flap 22 is provided as an example of a discharge switching unit, and the main body frame 30A of the document conveying device 3 is swingable up and down with respect to the fixed tray 21 around a swing shaft 22A provided on the downstream side. It is supported by. A bent portion 22 </ b> C that is bent downward is formed at the upstream end portion of the flap 22.

  A cam 24 is engaged with the upstream end portion of the flap 22. The cam 24 includes a push-up bar 24A extending below both ends in the width direction below the flap 22, shaft portions 24B provided on both sides of the flap 22, and connecting portions 24C that connect both ends of the push-up bar 24A and the shaft portions 24B. And comprising. Each shaft portion 24 </ b> B is pivotally supported on the main body frame 30 </ b> A of the document conveying portion 30. Such a cam 24 is rotated in the forward and reverse directions by a driving means (not shown) controlled by the control device 4, so that the flap 22 is positioned below and shown in FIG. Swing between the upper position.

<Configuration of the document feeder>
As shown in FIG. 2, the document transport unit 30 includes a U-shaped transport path 31 (see a thick solid line) for guiding the document from the supply tray 10 to the discharge tray 20 and a Y-shape for switching back the document. Inversion path 32 (see thick broken line).

  A separation roller 41 and a separation nip piece 41 </ b> A are provided at an entrance portion of the conveyance path 31, that is, a connection portion with the supply tray 10. The separation nip piece 41A is biased toward the separation roller 41 by a spring (not shown).

  A first conveyance roller 42 and a second conveyance roller 43 are provided in the conveyance path 31 in order from the upstream side. Between the first conveyance roller 42 and the second conveyance roller 43, the above-described image sensor 2S is disposed. Downstream of the second transport roller 44, the entrance of the reverse path 32 is connected to the transport path 31, that is, the path is branched. A flap-shaped first guide member 61 that distributes the document to the conveyance path 31 and the reversal path 32 is provided at the branch portion.

  A discharge roller 44 that discharges the document M to the discharge tray 20 is provided at the downstream end of the transport path 31.

  The reversing path 32 includes a first reversing path 32A extending from the branch with the transport path 31 described above toward the outside (right side in FIG. 2), and a branch from the first reversing path 32A and extending obliquely downward. And a second reversing path 32B that merges in the vicinity of the upstream end. At the end of the first reversing path 32A, a switchback roller 46 for discharging a part of the document M to the outside and a third transporting roller 45 for assisting transport of the document in the first reversing path 32A are provided. Yes. The switchback roller 46 is controlled to rotate in the forward and reverse directions by the control device 4, and is partially moved to the position where the original M is temporarily discharged to the outside by the forward rotation and can enter the second reversing path 32 </ b> B. Further, the document M is sent to the second reversing path 32B by reverse rotation. The switching between the first reversing path 32 </ b> A and the second reversing path 32 </ b> B is performed by a flap-shaped second guide member 62 similar to the first guide member 61.

A suction roller 110 is disposed near the separation roller 41 in the supply tray 10 so as to partially protrude from the supply tray 10. The suction roller 110 functions to bring the lowermost document M toward the separation roller 41 by being rotationally driven by a motor as is well known. Above the suction roller 110, there is provided a suction nip piece 120 whose front end faces the downstream side and contacts the suction roller 110 at the front end. The suction nip piece 120 is supported by the main body frame 30 </ b> A so as to be swingable about the upstream end. The suction nip piece 120 is always urged downward by the torsion spring 125, that is, toward the suction nip piece 120.
A pin 126 as an example of a regulating member is fixed above the suction nip piece 120. The pin 126 regulates the swing range of the suction nip piece 120.

  A paper feed sensor 13 is provided between the suction roller 110 and the separation roller 41 to detect a document supplied to the supply tray 10. The detection result of the paper feed sensor 13 is output to the control device 4. A known passage detection sensor 33 for detecting the passage of the document is disposed on the conveyance path 31. The detection result of the passage detection sensor 33 is also output to the control device 4.

  The reading operation of the document M by the document conveying unit 30 will be briefly described. FIGS. 3A and 3B are diagrams for explaining the operation during double-sided reading, and FIG. 4 is a diagram for explaining the operation during single-sided reading.

<Operation during duplex scanning>
As shown in FIG. 3A, at the time of double-sided reading, the document M (M1, M2) is supplied to the supply tray 10 with the front reading surface P3 (P1) facing down and the back reading surface P4 (P2) facing up. Set on top. When double-sided scanning is selected by a user operation, the flap 22 swings downward, the first guide member 61 swings upward, and the second guide member 62 swings downward.

  When the user inputs an instruction to start reading, the document M2 on the supply tray 10 is sent to the transport path 31 by the separation roller 41, transported to the reading position R by the first transport roller 42, and read on the front side by the image sensor 2S. Surface P3 is read. Thereafter, the document M2 enters the reverse path 32 by the second transport roller 43 and the third transport roller 45. Then, the document M2 is once discharged to the outside by the switchback roller 46.

When almost the entire document M2 is discharged from the switchback roller 46, the control device 4 causes the first guide member 61 to swing downward and the second guide member 62 to swing upward. Then, the switchback roller 46 is reversed by the control of the control device 4, and sends the document M2 to the second reversing path 32B as shown in FIG. The document M2 is conveyed by the first conveyance roller 42 and the second conveyance roller 43, and the reading surface P4 on the back side is read by the image sensor 2S.
Thereafter, the document M <b> 2 is discharged to the discharge tray 20 by the paper discharge roller 44. At this time, since the flap 22 of the discharge tray 20 is positioned below, the document M2 is stacked on the document M1 already stacked on the discharge tray 20. This discharge mode is called a lamination mode.

  As described above, when the original M2 is stacked on the stacked original M1 from which the original M2 has already been discharged after double-sided reading, the front reading surface P1, the reverse reading surface P2, and the original M2 front of the original M1 from the bottom. The reading surface P3 and the back reading surface P4 are arranged in this order, and the pages can be stacked with the page order aligned. This order is the same as the page order when the documents M1 and M2 are placed on the supply tray 10.

<Operation during single-sided scanning>
As shown in FIG. 4, during single-sided reading, the document M2 is set on the supply tray 10 with the reading surface P2 (P1) facing downward. When single-sided reading is selected by the user's operation, as shown in FIG. 4, the flap 22 swings upward and the first guide member 61 swings downward.

  When the user inputs an instruction to start reading, the document M2 on the supply tray 10 is sent to the transport path 31 by the separation roller 41, transported to the reading position R by the first transport roller 42, and the reading surface P2 is moved to the image sensor 2S. Is read by. Thereafter, the document M <b> 2 is conveyed by the second conveyance roller 43 and the paper discharge roller 44 and is discharged to the discharge tray 20.

  Here, in a state where the flap 22 swings upward, the bent portion 22C of the flap 22 is located above the position where the pair of paper discharge rollers 44 nip, so the paper already discharged on the flap 22 is discharged. The rear end of the original M1 is positioned above the position where the pair of paper discharge rollers 44 are nipped. As a result, the document M2 discharged later comes into contact with the rear end portion of the document M1 that has already been discharged to the discharge tray 20 from below, and is then discharged so as to sink under the document M1. This discharge mode is called a sneak mode.

  In the sneak mode, the document is discharged so that the reading surface faces upward and sequentially sinks under the already discharged document. Therefore, the page order of the documents M1 and M2 is aligned with P1 and P2 in order from the top. be able to. This order is the same as the page order when the documents M1 and M2 are placed on the supply tray 10.

<Retraction mechanism of suction nip piece>
Next, an example of the retracting mechanism of the suction nip piece 120 will be described. FIG. 5 is a perspective view showing a retracting mechanism of the suction nip piece in the document conveying device according to the first embodiment. In FIG. 5, the surrounding parts are removed so that the retracting mechanism of the suction nip piece can be seen.

  As shown in FIG. 5, the suction nip piece 120 is integrally fixed to one end of a swing support shaft 121 extending in the front-rear direction. The nip piece operation lever 122 is integrally fixed to the other end of the swing support shaft 121, that is, the front end. The swing support shaft 121 is supported by a main body frame 30 </ b> A (not shown in FIG. 5), and transmits the rotational force applied to the nip piece operation lever 122 to the suction nip piece 120. The nip piece operation lever 122 has a free end of the lever extending to the right and is slightly inclined upward.

An operation at the time of reading a document in the document reading apparatus 1 configured as described above will be described.
Before the user sets a document on the supply tray 10 of the document reading apparatus 1, the suction nip piece 120 is pushed downward by a torsion spring 125. Therefore, the tip of the suction nip piece 120 is pressed against the suction roller 110 by the urging force of the torsion spring 125.

  When the user sets a plain paper or thick paper document that is relatively strong, the user does not need to operate the nip piece operation lever 122, and the first page (for single-sided reading) or the first page (for double-sided reading). ) Is placed on the supply tray 10 facing down, and the document is pressed leftward, that is, toward the separation roller 41. By this pressing force, the document lifts the suction nip piece 120 against the biasing force of the torsion spring 125, enters between the suction roller 110 and the suction nip piece 120, and comes into contact with the separation roller 41.

  When the user inputs a document reading instruction, the suction roller 110 rotates and brings the lowest one document toward the separation roller 41. Thereafter, the separation roller 41 and each transport roller rotate, whereby the document is transported along the above-described path, and the document is read by the image sensor 2S.

When the user sets a thin paper document that is relatively weak, the user places the document on the supply tray 10 while pressing down the nip piece operation lever 122 and presses the document toward the separation roller 41. At this time, by pushing down the nip piece operating lever 122, the suction nip piece 120 swings upward and is separated from the suction roller 110. Therefore, even a thin original with weak stiffness can enter between the suction roller 110 and the suction nip piece 120.
Then, the user releases his hand from the nip piece operation lever 122. As a result, the document is sandwiched between the suction roller 110 and the suction nip piece 120. When the user inputs a document reading instruction, the lowermost document is moved toward the separation roller 41 by the suction roller 110 and the document is separated by the separation roller 41 and the like, as in the case of the above-described plain paper or thick paper document. Is conveyed, and the document is read by the image sensor 2S.

  As described above, according to the document reading apparatus 1 of the present embodiment, a gap can be formed between the suction roller 110 and the suction nip piece 120 by a user operation during document setting, and a document can be inserted into this gap. Even a thin document can be set without making wrinkles and read. Further, since the original cannot be wrinkled, it is possible to prevent the original from being jammed in the original conveying device 3.

[Second Embodiment]
Next, an embodiment in which the retracting operation of the suction nip piece 120 is realized regardless of the user's operation will be described. In the second embodiment, only different parts from the first embodiment will be described, and the same parts will be denoted by the same reference numerals and the description thereof will be omitted. FIG. 6 is a perspective view corresponding to FIG. 5 for explaining the retracting mechanism of the suction nip piece. FIG. 7A is a perspective view showing all of the retracting mechanism, and FIG. () Is an exploded perspective view of the torque limiter, FIG. 8 is a side view for explaining the movement of the retracting mechanism, (a) shows the time when the original is conveyed, and (b) shows the time when the original is set.

As shown in FIGS. 6 and 7A, the suction nip piece 120 according to the second embodiment is swung up and down using the driving force of the motor 200 that drives the separation roller 41. Yes.
In the motor 200, an output gear 202 is provided on the output shaft 201. The separation roller 41 is connected to the drive input shaft 220 so as to rotate integrally with the drive input shaft 220 extending in the front-rear direction. An input gear 221 is engaged with the rear end of the drive input shaft 220, and the input gear 221 meshes with the output gear 202 of the motor 200 described above.

  A gear 212 is fixed to the front end of the suction roller 110. This gear 212 meshes with a gear 222 fixed to the front end of the separation roller 41 via an idle gear 230.

  The suction nip piece 120 is integrally fixed to the front end of the swing shaft 210 extending in the front-rear direction. The swing shaft 210 is connected to the gear 260 via the torque limiter 270. The gear 260 meshes with the input gear 221 through a large-diameter idle gear 250.

  As shown in FIG. 7B, the torque limiter 270 includes a coil 271 wound in the right-handed direction, a coil 272 wound in the left-handed direction, and a connecting portion 273 that connects the coil 271 and the coil 272. It is a linear member consisting of The coil 271 is fitted to the outside of the connecting shaft portion 261 provided on the front surface of the gear 260, and the coil 272 is fitted to the outside of the connecting shaft portion 211 formed at the rear end of the swing shaft 210. Match. The coil 271 is formed so as to be slightly tightened to the connecting shaft portion 261, and the coil 272 is similarly formed to be slightly tightened to the connecting shaft portion 211. As described above, since the gear 260 and the swing shaft 210 are connected via the torque limiter 270, the rotational driving force of the gear 260 transmits the rotational force to the suction nip piece 120 at a predetermined upper limit torque or less. Can be done.

  Specifically, the gear 260 rotates in the forward direction (in this specification, the members such as the motor 200 and each gear are referred to as “forward rotation” when the suction roller 110, the separation roller 41, and the like rotate in the direction in which the document is fed. When rotating in the direction opposite to the normal rotation, this is referred to as “reverse rotation”.) In FIG. 7B, the gear 260 rotates counterclockwise, and this driving force is transmitted through the torque limiter 270 to the swing shaft 210. Is transmitted to. However, when the suction nip piece 120 comes into contact with the suction roller 110, the coil 271 expands in diameter and rotates idle between the connection shaft portion 261 and the coil 271.

  On the other hand, when the gear 260 rotates in the reverse direction (rotates clockwise in FIG. 7B), the rotational force is transmitted to the swing shaft 210 below the predetermined upper limit torque, and the suction nip piece 120 swings upward. When the suction nip piece 120 comes into contact with the pin 126 (see FIG. 8B), the swinging of the suction nip piece 120 is stopped, the coil 272 expands in diameter, and is idled between the connection shaft portion 211. .

  In the present embodiment, the predetermined upper limit torque at the time of reverse rotation is set so large that the suction nip piece 120 can be swung upward against the biasing force of the torsion spring 125. The upper limit torque for forward rotation and the upper limit torque for reverse rotation set in the torque limiter 270 are the same in this embodiment, but may be different. The above gears are supported by the main body frame 30A.

  The control device 4 is configured to control the rotation of the motor 200. When the user's reading instruction (document conveyance instruction) is input, the control device 4 rotates the motor 200 in a forward direction so as to suck the document. Then, when the intake of the document is finished, the motor 200 is rotated in the reverse direction. The timing at which the control device 4 reversely rotates the motor 200 after the document has been sucked is appropriately set according to the range of the members that the motor 200 drives.

  For example, if the motor 200 is provided only for rotating the suction roller 110 and the separation roller 41 and the other transport rollers (the first transport roller 42, the paper discharge roller 44, etc.) are driven by another motor, the control is performed. The apparatus 4 may reversely rotate the motor 200 immediately after the document has been sucked, that is, after the trailing edge of the last document has passed the separation roller 41. As another example, if the motor 200 drives not only the suction roller 110 and the separation roller 41 but also other transport rollers, for example, the paper discharge roller 44, the control device 4 finishes the suction of the document. After that, the last document may be rotated in the reverse direction after passing through the paper discharge roller 44.

  In the following description, it is assumed that the control device 4 reversely rotates the motor 200 immediately after the trailing edge of the last document has passed the separation roller 41 as in the former case. Whether or not it is the last document can be easily determined from the detection result of the paper feed sensor 13, and how far the last document has reached is easily determined using a known sensor such as the passage detection sensor 33. can do.

The operation of the document reading apparatus 1 configured as described above will be described.
When the document M is set on the supply tray 10, as shown in FIG. 8B, the suction nip piece 120 is stopped at a position that swings upward, so that the gap between the suction roller 110 and the suction nip piece 120 is set. The user can easily insert the document M between the suction roller 110 and the suction nip piece 120 and bring the leading edge of the document M to the position of the separation roller 41.

  When the user inputs a reading instruction (an instruction for conveying a document), the motor 200 is rotated forward by the control device 4. As a result, as shown in FIG. 8A, the output gear 202 rotates clockwise as viewed from the front, and this rotation is transmitted in the order of the input gear 221, the gear 222, the idle gear 230, and the gear 212, and the suction roller 110 is rotated. Rotate counterclockwise. On the other hand, the rotation of the output gear 202 is transmitted in the order of the input gear 221, the idle gear 250, and the gear 260 to swing the suction nip piece 120 downward via the torque limiter 270. When the suction nip piece 120 abuts on the suction roller 110 (or abuts via the document M), the suction nip piece rotates idly between the torque limiter 270 and the connecting shaft portion 261, and the rotation of the gear 260 rotates at a predetermined torque. Then, the suction nip piece 120 is pressed downward with a predetermined force.

Accordingly, the suction nip piece 120 sandwiches the document M between the suction roller 110 and gives an appropriate frictional force between the lowermost document M and the suction roller 110. This clamping force is based on the combined force of the torque of the torsion spring 125 and the torque transmitted to the suction nip piece 120 via the torque limiter 270.
The suction roller 110 brings the lowest document M to the separation roller 41, and the separation roller 41 sucks the lowest document M into the document conveying device 3.

  The control device 4 continues the normal rotation of the motor 200 to suck in the document M, and intermittently by known control according to the transport position of the document M until the trailing edge of the last document M passes the separation roller 41. The motor 200 is rotated forward. Then, after the paper feed sensor 13 no longer detects the original M, when the passage detection sensor 33 detects the passage of the rear end of the original M, the last original M passes through the separation roller 41 and is sucked into the original conveying device 3. Therefore, the control device 4 rotates the motor 200 in the reverse direction.

When the motor 200 rotates in the reverse direction, as shown in FIG. 8B, the gears rotate in the reverse direction, and the suction nip piece 120 swings upward. When the suction nip piece 120 swings upward and comes into contact with the pin 126, the suction nip piece 120 can no longer swing upward and rotates idle between the torque limiter 270 and the connecting shaft portion 211.
The control device 4 stops the motor 200 after rotating the motor 200 backward for a predetermined time sufficient for the suction nip piece 120 to contact the pin 126. Thereby, a gap is formed between the suction nip piece 120 and the suction roller 110, and the original M can be received between the suction nip piece 120 and the suction roller 110 as shown in FIG. 8B. It becomes.

  As described above, according to the present embodiment, the motor 200 for driving the suction roller 110 is reversely rotated after the completion of the document suction, thereby swinging the suction nip piece 120 upward in preparation for the next document set. A gap can be formed between the suction nip piece 120 and the suction roller 110. Therefore, even when an original made of thin paper is set, the original can be read without being wrinkled. Further, since the original cannot be wrinkled, the original can be prevented from being jammed in the original conveying device 3. Furthermore, since it is possible to automatically set the original after the completion of the suction of the document without the user's operation, it is possible to eliminate the user's trouble of operating the suction nip piece 120 and the suction nip. A gap can be reliably formed between the piece 120 and the suction roller 110 to easily set the document.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of this invention.

  In the second embodiment described above, a motor that drives the separation roller 41 is illustrated as the motor 200. However, the motor 200 may drive only the suction roller 110 and the suction nip piece 120, and conversely. The motor 200 may also drive other transport rollers.

  In the second embodiment, the driving force of the motor 200 can generate a force that presses the suction nip piece 120 against the suction roller 110, so the torsion spring 125 may be omitted.

  In the above-described embodiment, the present invention is applied to a document reading apparatus that performs both single-sided scanning and double-sided scanning. However, the present invention can also be applied to a single-sided scanning document reading apparatus. In the embodiment, the present invention is applied to the document conveying apparatus having both the stacking mode and the submerged mode as the discharge mode. However, the present invention is applied to the document conveying apparatus having only one of the discharge modes. You can also.

1 is an overall perspective view of an original reading apparatus including an original conveying apparatus according to a first embodiment of the present invention. 1 is a diagram illustrating an overall configuration of a document reading apparatus including a document conveying device according to a first embodiment of the present invention. (A) And (b) is a figure explaining the operation | movement at the time of double-sided reading. It is a figure explaining the operation | movement at the time of single-sided reading. FIG. 3 is a perspective view showing a retracting mechanism for a suction nip piece in the document conveying device according to the first embodiment. FIG. 6 is a perspective view corresponding to FIG. 5 for explaining a retracting mechanism of the suction nip piece. (A) is the perspective view which showed all the evacuation mechanisms, (b) is a disassembled perspective view of a torque limiter. 4A and 4B are side views for explaining the movement of the retracting mechanism, in which FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Document reading apparatus 2 Flatbed scanner 3 Document conveying apparatus 4 Control apparatus 10 Supply tray 20 Discharge tray 22 Flap 30 Document conveying part 31 Conveyance path 32 Inversion path 32A First inversion path 32B Second inversion path 41 Separating roller 110 Suction roller 120 Suction nip piece 121 Swing support shaft 122 Nip piece operation lever 126 Pin 200 Motor 270 Torque limiter M Document

Claims (4)

A supply tray for placing documents;
A suction roller arranged to protrude from below the supply tray and sucking a document on the supply tray;
A suction nip piece disposed opposite the suction roller and biased toward the suction roller when sucking a document on the supply tray;
An original conveying apparatus, comprising: a retraction mechanism that retracts the suction nip piece from the suction roller when the original is set on the supply tray. The suction nip piece is swingably provided,
2. The document conveying apparatus according to claim 1, wherein the retracting mechanism is a lever that is connected so that power is transmitted to the suction nip piece and is rotated by a user. The suction nip piece is swingably provided,
A regulating member that regulates the swing range of the suction nip piece;
A forward and reverse rotatable motor for applying a driving force to the suction roller;
A power transmission mechanism for transmitting the rotation of the motor to the rotation of the suction nip piece so as to urge the suction nip piece toward the suction roller during forward rotation;
A torque limiter provided as part of the power transmission mechanism and configured to transmit a rotational force to the suction nip piece below a predetermined upper limit torque;
A control device for controlling the operation of the motor,
The control device rotates the motor forward to suck the document when an instruction to transport the document is input, and then reversely rotates the motor when the document suction is finished. The document conveying apparatus according to claim 1, wherein the document is retracted from the suction roller.   Ejection switching that switches between a stacking mode in which subsequent documents are stacked on top of a document that has already been ejected, and a submersion mode in which subsequent documents are submerged under the already ejected document. 4. The document conveying device according to claim 1, further comprising means.

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