JP5527239B2 - Sheet conveying apparatus and image reading apparatus - Google Patents

Description

  The present invention relates to a sheet conveying apparatus and an image reading apparatus.

  2. Description of the Related Art Conventionally, an image reading apparatus provided with an automatic document feeder (hereinafter abbreviated as ADF) has been proposed in which a movable shutter is provided near the upstream end of a document transport path (for example, , See Patent Document 1).

  In this automatic document feeder, when the document is set on the document table, the shutter is moved to a position that interrupts the document transport path, and the leading end of the document in the document transport direction is brought into contact with the shutter. Can be aligned. Further, when the document is transported along the transport path, the shutter can be retracted to a position that does not block the document transport path.

Japanese Patent Laid-Open No. 11-199079

  However, in the technique described in Patent Document 1, a spring clutch is used to operate the shutter, and a correspondingly complicated movable mechanism is configured. More specifically, the shutter is supported on the rotating shaft of the reverse roller through the arm portion, a spring clutch is inserted into the rotating shaft of the reverse roller, and a connecting portion having a groove portion is formed on the arm portion. The claw of the spring clutch is engaged with the groove.

  For this reason, in addition to the shutter itself, it is necessary to assemble a spring clutch and the like, which not only increases the number of parts but also increases the number of assembly steps correspondingly, all of which cause an increase in manufacturing cost.

  Further, since the shutter is rotatably supported via the arm portion, the portion that is farthest from the rotation center moves in a correspondingly large range. For this reason, if a movable space that does not hinder the movement of the shutter is secured, there is a problem that a correspondingly large space is occupied to arrange the shutter.

  The present invention has been made in order to solve the above-described problems, and has an object of providing a structure that can align the leading ends in the conveyance direction of a sheet to be conveyed, and a structure that is simpler than the conventional product. It is an object of the present invention to provide a sheet conveying apparatus and an image reading apparatus including such a sheet conveying apparatus.

The sheet conveying apparatus described in the present specification includes a sheet stacking unit having a stacking surface on which sheets to be transported are stacked, and a separation roller that transports a sheet supplied from the sheet stacking unit in a predetermined transporting direction. The sheet fed in the conveying direction by the separation roller is brought into contact with the surface opposite to the surface with which the separation roller is in contact, and a frictional resistance is applied to the contact location by the separation roller. Separation pieces for separating the fed sheets one by one in cooperation with the separation roller, a fixed part fixed at a predetermined location, and another part connected to the fixed part It is a displacement part that can be displaced between the first position and the second position as the bending state or bending state of the boundary part changes at the boundary part with the fixed part, and the displacement part is First place In this case, the sheet conveyance direction leading end of the sheet stacked on the sheet stacking unit is brought into contact with the displacement unit, thereby being used as a positioning member for aligning the sheet conveyance direction leading end at a predetermined position. In addition, when the separation roller is rotated forward in order to transport the sheet supplied from the sheet stacking unit in the transport direction, the displacement unit moves from the first position to the second position. And a film member that is displaced and does not hinder the conveyance of the sheet.

  According to the sheet conveying apparatus configured as described above, when the displacement portion of the film member is at the first position, the leading end portion in the sheet conveying direction can be aligned at a predetermined position. Therefore, it is possible to suppress the occurrence of double feeding and idle feeding compared to the case where the conveyance is started in a state where the leading ends in the conveyance direction of the sheet are not aligned.

  Further, when the separation roller is rotated forward, the bending state or the bending state of the film member changes at the boundary portion between the fixed portion and the displacement portion, and the displacement portion of the film member changes from the first position to the second position. And the sheet is not disturbed. Therefore, for example, the intended sheet conveyance can be carried out with a very simple configuration in which the bending state or the bending state of the film member is changed without using a rotating mechanism constituted by a support shaft and a bearing. It can be switched to a ready state.

In the sheet conveying device described in the present specification , the separation roller is disposed at a position opposite to the stacking surface of the sheet stacking unit across the sheet conveying path, and the separation piece and The film member is preferably disposed at a position on the same side as the stacking surface of the sheet stacking unit with respect to the sheet conveyance path.

According to the sheet conveying apparatus configured as described above, the sheets stacked on the sheet stacking unit can be sequentially conveyed from the top.
In the sheet conveying device described in this specification , the film member receives the force from the separation roller or a movable portion that operates following the separation roller when the separation roller is rotated forward. by varying the flexion or bending state portion, said displacement portion is displaced to the second position from the first position, it is preferable that a state that does not interfere with the conveyance of the sheet.

  According to the sheet conveying apparatus configured as described above, the separation roller or the movable portion can change the bending state or the bending state of the film member, so that the displacement portion of the film member can be displaced to the second position. Compared to the case where a shutter that does not bend or bend is operated by a mechanical dedicated mechanism, a complicated dedicated mechanism becomes unnecessary.

In the sheet conveying device described in this specification , the film member receives the force from the separation roller or the movable portion when the separation roller is rotated in the reverse direction to the normal rotation, and the boundary portion of by flexion or bending state is changed, said displacement portion is displaced into the first position from the second position, preferably be a usable state as the positioning member.

According to the sheet conveying apparatus configured as described above, the separation roller or the movable unit can operate the film member to return the displacement portion of the film member to the first position.
In the sheet conveying apparatus described in the present specification , the separation roller rotates the reverse portion when the conveyance of the sheets stacked on the sheet stacking portion is completed, thereby causing the displacement portion of the film member to move. It is preferable to displace from the second position to the first position.

  According to the sheet conveying apparatus configured as described above, when the conveyance of the sheet is completed, the displacement portion of the film member returns to the first position, so that the next time the sheet is stacked on the sheet stacking portion. Even if it is not particularly prepared in advance, the front end of the sheet in the sheet conveying direction can be aligned using the film member.

In the sheet conveying apparatus described in the present specification , the separation roller rotates in the reverse direction during the initialization operation after turning on the power, thereby moving the displacement portion of the film member from the second position to the first position. It is preferable to displace to.

  According to the sheet conveying apparatus configured in this way, the displacement portion of the film member returns to the first position during the initialization operation after the power is turned on, so when the sheets are stacked on the sheet stacking portion after the power is turned on. In this case, the sheet conveyance direction front end portion can be aligned using the film member without any special preparation.

In the sheet conveying apparatus described in the present specification, it is preferable that the film member and the separation piece are disposed at positions that do not overlap each other.

  According to the sheet conveying apparatus configured as described above, the film member and the separation piece do not interfere with each other's functions. Therefore, it is possible to easily achieve the desired performance only by optimizing the film member and the separation piece. Can be made.

In the sheet conveying apparatus described in the present specification, it is preferable that the film member and the separation piece are disposed at positions where they overlap each other.

  According to the sheet conveying apparatus configured as described above, since the film member and the separation piece are disposed at positions where they overlap each other, it is possible to achieve space saving with respect to the arrangement location. In addition, since both the single film member and the single separation piece can be arranged at the center in the width direction with respect to the width direction of the sheet which is a direction perpendicular to the sheet conveyance direction and parallel to the front and back surfaces of the sheet Even if a pair of film members and a pair of separation pieces are not disposed at positions apart from each other across the center in the width direction, a symmetric structure in the width direction can be easily formed.

In the sheet conveying device described in the present specification, in the film member, the boundary portion between the fixed portion and the displacement portion is in the same position as the stacking surface of the sheet stacking portion in the vertical direction, or from the stacking surface. Is preferably provided at a lower position.

  According to the sheet conveying apparatus configured as described above, the position where the film member bends or curves in accordance with the displacement of the displacement unit is the same position as the stacking surface of the sheet stacking unit or a position below the stacking surface. Therefore, it is possible to suppress the sheet from being caught by the film member during sheet conveyance, as compared with the case where the bent or curved portion is provided at a position above the stacking surface of the sheet stacking unit.

The image reading apparatus described in this specification is configured to be capable of conveying a document to be read by the sheet conveying apparatus described in this specification .

  According to the image reading apparatus configured as described above, when the original to be read is conveyed, the operation and effect as described for the sheet conveying apparatus can be expected, and the leading ends in the conveying direction of the original are not aligned. It is possible to suppress the occurrence of double feeding and idle feeding compared to those that carry in the state.

FIG. 2A and 2B are diagrams illustrating an image scanner unit included in the multifunction machine, in which FIG. 1A is a longitudinal sectional view showing a state where a document supply tray is closed, and FIG. 2B is a longitudinal sectional view showing a state where the document supply tray is opened. (A) is a perspective view which shows the film member of 1st embodiment, and the periphery structure, (b) is an enlarged view of the A section shown in FIG. 3 (a). Explanatory drawing which shows the behavior of the film member of 1st embodiment. The block diagram which shows the control system relevant to an ADF part. The flowchart which shows the process relevant to an ADF part. (A) is a perspective view which shows the film member of 2nd embodiment, and the structure of its periphery, (b) is an enlarged view of the B section shown in FIG. 7 (a). Explanatory drawing which shows the behavior of the film member of 3rd embodiment.

Next, embodiments of the present invention will be described with some specific examples.
[1] First embodiment [Structure of MFP]
The multifunction device 1 shown in FIG. 1 has other functions (for example, a print function, a copy function, a facsimile transmission / reception function, etc.) in addition to a function (scan function) as an image reading apparatus. In the following description, in order to easily understand the relative positional relationship between the units included in the multifunction device 1, the vertical, horizontal, and front-rear directions shown in the drawing are used.

  The multifunction machine 1 includes a printer unit 2, a scanner unit 3 mounted on the upper part of the printer unit 2, and an operation unit 4 disposed on the printer unit 2 and in front of the scanner unit 3. The printer unit 2 incorporates an image forming mechanism capable of forming an image on a recording medium by electrophotography. A paper feed cassette 6 that can be pulled out forward is disposed below the printer unit 2, and a recording medium discharge unit 7 that discharges a recording medium on which an image has been formed is disposed above the printer unit 2. Is provided.

  The scanner unit 3 has a structure in which an ADF is added to a flat bed (hereinafter abbreviated as FB) type image scanner, and includes an FB main unit 3A and an ADF that covers the upper surface side of the FB main unit 3A. Part 3B. The ADF unit 3B is configured to be rotatable in a direction in which the front end side is displaced up and down with the rear end side as a rotation center, and thereby, a position covering the document placement surface on the upper surface of the FB main body unit 3A or The structure can be displaced to a position where the placement surface is exposed.

  Further, as shown in FIGS. 2A and 2B, the ADF unit 3B includes a supply roller 11, a separation roller 12, and a main transport roller 13 as rollers driven by power transmitted from a power source. And a discharge roller 14 and the like.

  The supply roller 11 is held by a supply holder 15 that can be rotated about the same axis as the rotation center of the separation roller 12. By rotating the supply holder 15, the supply roller 11 and the document table 16 can be rotated. The distance can be changed.

  A separation piece 17 is disposed below the separation roller 12. The separation piece 17 is a member that comes into contact with a document that is sent to the downstream side in the conveyance direction by the separation roller 12 on a surface opposite to the surface that the separation roller 12 contacts, and gives frictional resistance to the contact portion. is there. By providing such a separation piece 17, the document fed by the separation roller 12 is separated into one by one in cooperation with the separation roller 12 and the separation piece 17.

  The supply roller 11, the separation roller 12, the main conveyance roller 13, and the discharge roller 14 convey a document placed on the document table 16 in a substantially U-shape indicated by a two-dot chain line in FIG. A conveyance mechanism that conveys the original to the document discharge unit 18 along the path is configured.

  A part of the document table 16 is configured to be rotatable to a closed position shown in FIG. 2A and an open position shown in FIG. 2B, and when moved to the closed position, the upper part of the ADF unit 3B It functions as a cover that covers a part of the document, and can be used as a document table when moved to the open position.

  A first document holder 21 is disposed at a position along one side of the opposed path portions constituting the substantially U-shaped conveyance path described above. The first document holder 21 is a member that presses the document transported along the transport path described above against the first ADF glass (not shown) on the FB main body 3A side.

  The FB main body 3A is provided with a first image sensor (not shown) configured to be able to reciprocate within the FB main body 3A. When the first image sensor is moved to a position facing the first document holder 21 with the first ADF glass interposed, an image can be read by the first image sensor from the document conveyed on the conveyance path described above. it can.

  Further, the second original is located at a position along the path portion on the side opposite to the position where the first original holder 21 is disposed (upstream in the conveyance direction) at a position along the above-described substantially U-shaped conveyance path. A holder 22 is provided. The second document holder 22 is a member that presses the document transported along the transport path described above against the second ADF glass 24.

  Inside the ADF unit 3B, a second image sensor 26 is provided at a position facing the second document holder 22 with the second ADF glass 24 interposed therebetween. Even if the second image sensor 26 is used, the above-described transport path is provided. The image can be read from the original conveyed. That is, in the multi-function device 1, images can be read from both the front and back sides of the document conveyed on the conveyance path by using the first image sensor and the second image sensor described above.

  Further, as shown in FIGS. 3A and 3B, a film member 31 is provided at a position upstream of the separation roller 12 in the transport direction. The film member 31 is formed of an elastically deformable plastic film.

  Part of the film member 31 is displaced to the first position (position shown in FIGS. 4A and 4B) and the second position (position shown in FIGS. 4C and 4D). It is possible displacement part 31A. In addition, a portion connected to the displacement portion 31A is a fixing portion 31B fixed to the document table 16 side.

  The distal end of the displacement portion 31A is in contact with the separation roller 12. When the separation roller 12 rotates, the distal end of the displacement portion 31A is displaced following the separation roller 12, and accordingly the displacement portion 31A and The bending state of the film member 31 changes at the boundary portion of the fixed portion 31B, and the displacement portion 31A is displaced to the first position or the second position.

  Further, as shown in FIGS. 4A to 4D, a document detection sensor 33 is provided in the vicinity of the film member 31 and at a position upstream of the film member 31 in the document transport direction. .

  The document detection sensor 33 can be displaced to the position shown in FIG. 4A or the position shown in FIG. 4B by rotating, and is turned on / off when it is displaced from one position to the other position. Are configured to be switched. The document detection sensor 33 is urged in a clockwise direction in the figure by a spring (not shown).

  In a state in which no document is stacked on the document table 16, the document detection sensor 33 receives a biasing force from the spring and rotates clockwise in the drawing, and is displaced to the position shown in FIG. . Further, as will be described in detail later, in a state in which no document is stacked on the document table 16, control is performed to reversely rotate the separation roller 12 by a predetermined amount (counterclockwise in FIG. 4A). The displacement part 31A of the film member 31 is displaced to the first position shown in FIG.

  In this state, as shown in FIG. 4B, when the document D is stacked on the document table 16, the document detection sensor 33 receives the load from the document and rotates counterclockwise in the drawing. When the document D is stacked on the document table 16, the leading end position of the document D can be aligned by bringing the leading end of the document D in the transport direction into contact with the film member 31. That is, when the displacement portion 31 </ b> A of the film member 31 is at the first position, the film member 31 functions as a positioning member for aligning the leading end portion of the document D in the conveyance direction at a predetermined position.

  When the conveyance of the document D stacked on the document table 16 is started, the separation roller 12 is controlled to rotate forward (clockwise in FIG. 4B), and the displacement portion 31A of the film member 31 is Then, the first position shown in FIG. 4B is displaced to the second position shown in FIG.

  In a state where the displacement portion 31A is displaced to the second position, the document D sent out by the supply roller 11 reaches the separation roller 12 without being blocked by the displacement portion 31A, as shown in FIG. That is, the film member 31 does not interfere with the conveyance of the document D.

  When all the documents D stacked on the document table 16 are conveyed, the document detection sensor 33 moves in the clockwise direction in the drawing from the position shown in FIG. 4C to the position shown in FIG. It rotates to return to a state of protruding upward from the document placement surface of the document table 16. As a result, completion of conveyance of the document D is detected, and control is performed to reversely rotate the separation roller 12 by a predetermined amount (counterclockwise in FIG. 4A). As a result, the displacement portion 31A of the film member 31 returns to the state of being displaced to the first position shown in FIG.

[Control system and control related to ADF section]
Furthermore, as shown in FIG. 5, the multifunction device 1 uses a control unit 41, an ADF motor 43 controlled by the control unit 41, and power from the ADF motor 43 as a control system related to the ADF unit 3B. A supply roller 11, a separation roller 12, a main conveyance roller 13, and a power transmission mechanism 45 that transmits to the discharge roller 14 are provided.

  The control unit 41 is configured around a microcomputer including a well-known CPU, ROM, RAM, etc., and the CPU executes control according to a control program stored in the ROM or RAM, thereby controlling each unit of the multifunction device 1. Execute control.

  The control unit 41 is also connected to the document detection sensor 33 described above. In addition, various devices built in the printer unit 2, the scanner unit 3, and the operation unit 4 are also controlled by the control unit 41. However, these are unnecessary for explaining the operation and effect of the present invention. In FIG. 5, the illustration is omitted.

  Next, control related to the ADF unit 3B executed by the control unit 41 in the multifunction machine 1 will be described based on the flowchart of FIG. The process illustrated in FIG. 6 is a process that starts when the multifunction device 1 is powered on. In the MFP 1, other processes other than the processes shown in FIG. 6 may be executed sequentially or in parallel, but these are not shown.

  When the power of the multi-function device 1 is turned on, the control unit 41 starts the operation of the ADF unit 3B as the initialization process of the ADF unit 3B (S10). This is a control executed to discharge such a document because there is a possibility that the power of the multi-function peripheral 1 is turned off while the document remains in the ADF unit 3B.

  When the ADF unit 3B is operated as much as necessary for discharging the remaining document, the control unit 41 stops the operation of the ADF unit 3B (S20), and reversely rotates the separation roller 12 by a predetermined amount (S30). Thereby, the film member 31 returns from the state at the second position as shown in FIG. 4D to the state at the first position as shown in FIG.

  Thereafter, the control unit 41 stands by until an original is set on the platen 16 and an image reading command is input by an operation on the operation unit 4 (for example, pressing a start button) (S40). When a document is set on the document table 16, the document detection sensor 33 is turned from the position shown in FIG. 4A to the position shown in FIG. It is possible to detect that a document is set.

  Thereafter, when an image reading command is input, the control unit 41 rotates the separation roller 12 forward by a predetermined amount (S50). Thereby, the film member 31 is displaced from the first position as shown in FIG. 4B to the second position as shown in FIG.

  In this state, the control unit 41 starts the operation of the ADF unit 3B (S60), thereby starting the conveyance of the document, and thereafter waits until the document detection sensor 33 detects the completion of the document conveyance. (S70).

  When the document is removed from the document table 16 as the document is conveyed, the document detection sensor 33 is rotated from the position shown in FIG. 4C to the position shown in FIG. It can be detected from the state change that the document is no longer on the document table 16. If the document conveyance is continued for a predetermined time after the document has run out from the document table 16, the document conveyance is completed. At that time, the control unit 41 stops the operation of the ADF unit 3B (S80). At this time, the forward rotation of the separation roller 12 is also stopped.

  Thereafter, the control unit 41 reversely rotates the separation roller 12 by a predetermined amount (S90). Thereby, the film member 31 returns from the state at the second position as shown in FIG. 4D to the state at the first position as shown in FIG.

[effect]
As described above, according to the MFP 1, when the displacement portion 31A of the film member 31 is at the first position, the leading end portion in the document transport direction can be aligned at a predetermined position (FIG. 4 ( See b). Therefore, it is possible to suppress the occurrence of double feeding and idle feeding compared to ADF that starts conveyance in a state where the leading ends in the document conveyance direction are not aligned.

  When the separation roller 12 is rotated forward, the bending state of the film member 31 changes at the boundary portion between the displacement portion 31A and the fixed portion 31B, and the displacement portion 31A of the film member 31 is moved from the first position to the first position. It will be displaced to the second position, and will not interfere with the conveyance of the document (see FIG. 4C).

  Therefore, for example, a state in which a desired document conveyance can be performed with a very simple configuration in which the bending state of the film member 31 is changed without using a rotation mechanism configured with a support shaft and a bearing. You can switch to

  Further, according to the multifunction device 1, since the force is directly transmitted from the separation roller 12 to the film member 31 to displace the displacement portion 31A of the film member 31, a power transmission mechanism dedicated to the film member 31 is prepared. The displacement portion 31A can be displaced even without it.

  Further, according to the multifunction device 1, when the document conveyance is completed, the displacement portion 31A of the film member 31 is displaced from the second position to the first position in S90, so that the document is loaded on the document table 16 next. In this case, the front end of the document in the conveyance direction can be aligned using the film member 31 without any special preparation.

  Further, according to the above-described multi-function device 1, even during the initialization operation after the power is turned on, the displacement portion 31A of the film member 31 is displaced from the second position to the first position by S30. When doing so, the film member 31 can be used to align the front end of the document in the transport direction without any special preparation.

  Further, in the multifunction machine 1, the film member 31 is located on both sides of the separation piece 17 as shown in FIGS. 3A and 3B, and the film member 31 and the separation piece 17 are It is arranged at a position that does not overlap. Therefore, since the film member 31 and the separation piece 17 do not impede the functions of each other, it is possible to easily exhibit the expected performance by simply optimizing the characteristics of each of the film member 31 and the separation piece 17. it can.

  In addition, according to the multi-function machine 1, the portion of the film member 31 that is bent as the displacement portion 31A is displaced is the same position as the stacking surface of the document table 16 as shown in FIG. Or provided at a position below the loading surface. Therefore, compared with the case where the bent portion is provided at a position above the stacking surface of the document table 16, it is possible to suppress the document from being caught by the film member 31 during document conveyance.

[2] Second Embodiment Next, a second embodiment will be described. In the embodiment described below, the differences from the first embodiment will be described in detail, and the common parts will be denoted by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

  In the second embodiment, as shown in FIGS. 7A and 7B, a roller 51 that rotates about the same axis as the rotation center of the separation roller 12 shown in the first embodiment is provided. A film member 53 is brought into contact with 51. Even if such a structure is adopted, the film member 53 functions in the same manner as the film member 31 shown in the first embodiment.

  Therefore, when it is desired to increase the distance between the pair of film members 53 as compared with the first embodiment, it is also a proposal to adopt the configuration as in the second embodiment. In the case of the first embodiment, since the film member 31 can be displaced by the separation roller 12 without providing the dedicated roller 51, the number of parts can be reduced. In this case, since the roller 51 is not required to have a characteristic as a separation roller, the characteristic of the roller 51 can be easily optimized only for the purpose of displacing the film member 53.

[3] Third Embodiment Next, a third embodiment will be described.
In the third embodiment, a so-called trade-in mechanism is employed. Specifically, as shown in FIGS. 8A to 8D, the supply roller 61 and the separation roller 62 are disposed above. A separation piece 63 is provided, and the originals stacked on the original table 64 are conveyed one by one from the lower side.

  Even in this case, the distal end of the displacement portion 65A of the film member 65 abuts on the separation roller 62, and the fixing portion 65B is disposed on the same side as the separation piece 63 across the conveyance path. However, unlike the first embodiment, the fixing portion 65B is disposed at a position opposite to the document table 64 across the conveyance path. That is, the arrangement position of the film member 65 is not necessarily on the document table 64 side.

  Note that the states shown in FIGS. 8A to 8D correspond to the states shown in FIGS. 4A to 4D, respectively. It is omitted in the third embodiment.

[4] Modifications The embodiment of the present invention has been described above, but the present invention is not limited to the specific embodiment described above, and can be implemented in various other forms.

  For example, in the above-described embodiment, the film members 31 and 53 and the separation piece 17 are disposed at positions that do not overlap each other, but the film member 31 and the separation piece 17 may be disposed at positions that overlap each other. If it does in this way, the area which each film member 31 and separation piece 17 occupied can be reduced, and space saving can be attained more. However, in this case, on the assumption that the film member 31 overlaps the separation piece 17, it is necessary to optimize the characteristics of the separation piece 17 so that the separation piece 17 exhibits the expected performance.

  In the above-described embodiment, the multifunction device 1 having the function as an image reading apparatus (scan function) and the function as an image forming apparatus (printing function) has been exemplified. However, a single unit having only the function as the image reading apparatus is illustrated. The present invention can also be adopted in a functional image scanner device.

  DESCRIPTION OF SYMBOLS 1 ... MFP, 2 ... Printer part, 3 ... Scanner part, 3A ... FB main-body part, 3B ... ADF part, 4 ... Operation part, 6 ... Paper feed cassette , 7 ... Recording medium discharge unit, 11, 61 ... Supply roller, 12, 62 ... Separation roller, 13 ... Main transport roller, 14 ... Discharge roller, 15 ... Supply holder 16, 64... Original plate, 17, 63... Separation piece, 18... Original discharge unit, 21... First document holder, 22. Two ADF glasses, 26 ... second image sensor, 31, 53, 65 ... film member, 31A, 65A ... displacement portion, 31B, 65B ... fixed portion, 33 ... document detection sensor, 41 ... Control unit, 43 ... ADF motor, 45 ... Power transmission mechanism, 51 ... Roller

Claims (8)

A sheet stacking unit having a stacking surface on which sheets to be conveyed are stacked;
A separation roller for conveying a sheet supplied from the sheet stacking unit in a predetermined conveyance direction;
The sheet fed in the transport direction by the separation roller is brought into contact with the surface opposite to the surface with which the separation roller comes into contact, and a frictional resistance is applied to the contact portion, whereby the sheet is fed out by the separation roller. Separating pieces for separating the sheets to be separated one by one in cooperation with the separation roller;
A part is a fixed part fixed at a predetermined location, and another part connected to the fixed part is a boundary part between the fixed part and the bending state or bending state of the boundary part changes. A displacement portion that is displaceable between a first position and a second position is provided, and when the displacement portion is in the first position, a leading end portion in the conveyance direction of the sheets stacked on the sheet stacking portion is provided. By contacting the displacement portion, the sheet can be used as a positioning member for aligning the leading end portion in the conveyance direction of the sheet at a predetermined position, and the sheet supplied from the sheet stacking portion is conveyed in the conveyance direction. Therefore, when the separation roller is rotated forward, the displacement portion is displaced from the first position to the second position, and a film member that does not interfere with the conveyance of the sheet ,
The film member receives a force from the movable part that operates following the separation roller or the separation roller when the separation roller is rotated forward, and the bending state or the bending state of the boundary portion is changed. As a result, the displacement portion is displaced from the first position to the second position so that the conveyance of the sheet is not hindered, and the separation roller is rotated in the opposite direction to the normal rotation. In this case, the displacement portion is displaced from the second position to the first position by receiving a force from the separation roller or the movable portion and changing the bending state or the bending state of the boundary portion. Can be used as a positioning member
A sheet conveying apparatus. The separation roller is disposed at a position opposite to the stacking surface of the sheet stacking unit across the sheet conveyance path,
The sheet conveying apparatus according to claim 1, wherein the separation piece and the film member are disposed at a position on the same side as the stacking surface of the sheet stacking unit with respect to the sheet transport path. . The separation roller displaces the displacement portion of the film member from the second position to the first position by rotating backward when the conveyance of the sheets stacked on the sheet stacking portion is completed. The sheet conveying apparatus according to claim 1 , wherein the sheet conveying apparatus is configured as follows. Claim the separation roller, when the initializing operation after power-on, by the reverse rotation, characterized in that for displacing the displacement portion of the film member to said first position from said second position The sheet conveying apparatus according to any one of claims 1 to 3 . The sheet conveying device according to any one of claims 1 to 3, wherein the film member and the separation piece are disposed at positions that do not overlap each other. The sheet conveying device according to any one of claims 1 to 3, wherein the film member and the separation piece are disposed at positions where they overlap each other. In the film member, the boundary portion between the fixed portion and the displacement portion is provided at the same position as the stacking surface of the sheet stacking portion or below the stacking surface in the vertical direction. The sheet conveying apparatus according to any one of claims 1 to 6 , wherein An image reading apparatus configured to be capable of conveying a document to be read by the sheet conveying apparatus according to any one of claims 1 to 7 .

Images