JP2014088239A - Paper feeder - Google Patents

Abstract

Provided is a paper feeding device in which a separation roller is in uniform contact with a paper feeding roller and the separation roller can be easily replaced.
A sheet feeding device includes a sheet feeding roller that rotates to feed a sheet, a separation roller that presses against the sheet feeding roller and separates the sheet, a shaft on which the separation roller is detachably attached, A holder member that supports one end side, and a regulating member that is detachably attached to the other end side of the shaft and regulates the position of the separation roller attached to the shaft to a position where the separation roller can come into contact with the paper feed roller. The restricting member is configured to be removable from the other end side of the shaft, and a connecting portion that supports the other end side of the shaft by connecting to the holder member by attaching the restricting member to the shaft is a restricting member. Is provided.
[Selection] Figure 4

Description

  The present invention relates to a sheet feeding device that feeds a sheet to a predetermined processing position, and more particularly to a separation mechanism that separates and feeds a sheet by a sheet feeding roller and a separation roller that is in pressure contact with the sheet feeding roller.

  2. Description of the Related Art Conventionally, a sheet feeding device that separates one sheet from a plurality of sheets (documents) stacked on a sheet feeding tray and feeds the sheet toward a reading unit is used. Various methods for separating one sheet from a plurality of sheets have been proposed, and one of them is a reverse separation system using a separation roller (see, for example, Patent Document 1). The reverse separation method is suitable for separating and transporting a large number of sheets one by one at a high speed, and a sheet feeding roller that rotates in the sheet feeding direction to feed the sheet and a sheet that presses against the sheet feeding roller. A mechanism including a roller is employed. The sheet feed roller feeds the uppermost sheet (first sheet) on the sheet feed tray to the downstream side, and the separation roller rotates in the direction opposite to the rotation direction of the sheet feed roller to rotate the sheet on the sheet feed tray. Is prevented from being fed (the second and subsequent sheets).

  The conveying roller used in the sheet feeding device has a friction coefficient that decreases due to wear, and therefore needs to be replaced when the number of sheets conveyed reaches a predetermined amount. In order to facilitate the replacement of the transport roller, one end of the shaft to which the transport roller is attached is supported by a side plate inside the apparatus, and the other end is a free end (the other end is not supported). Thus, a method of attaching and detaching the conveying roller from the free end side of the shaft has been proposed (for example, Patent Documents 1, 2, or 3).

  In the paper feeding device configured to attach and detach the conveying roller from the free end side of the shaft, since only one end side of the shaft is supported, the shaft is inclined. For this reason, some conventional paper feeders have a configuration in which two portions on one end side of the shaft are supported by a side plate and a metal support plate to prevent the shaft from tilting.

JP-A-9-240852 Japanese Patent Laid-Open No. 10-77129 JP 2002-60066 A

  Similar to the transport roller, the separation roller needs to be replaced when the number of transported sheets reaches a predetermined amount. However, since the shaft to which the separation roller is attached needs to be swung in order to press the separation roller against the paper feeding roller, it is not possible to fix and support one end of the shaft at two points like the conveyance roller. Have difficulty. Therefore, in the conventional paper feeder, the shaft to which the separation roller is attached must be supported at one point. For this reason, there arises a problem that the shaft is inclined and a problem that the pressure contact force of the separation roller to the paper feed roller is not uniform.

  In addition, in the conventional sheet feeding device, a spring as a biasing means for pressing the separation roller against the sheet feeding roller must be provided only on one end side of the shaft. Becomes more uneven. Such non-uniform pressure contact force with respect to the separation roller is a factor that impairs sheet separation performance or causes sheet conveyance skew.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device in which the separation roller is in uniform contact with the paper feeding roller and the separation roller can be easily replaced.

  A sheet feeding device according to an aspect of the present invention includes a sheet feeding roller that rotates to feed a sheet, a separation roller that presses against the sheet feeding roller to separate the sheet, and a shaft to which the separation roller is detachably attached; A restriction that restricts the position of the holder member that supports one end of the shaft and the separation roller that is detachably attached to the other end of the shaft, so that the separation roller can contact the paper feed roller. The restricting member is configured to be removable from the other end side of the shaft, and a connecting portion that supports the other end side of the shaft by connecting the restricting member to the shaft and supporting the other end side of the shaft Is provided.

  The connecting portion may position the separation roller with respect to the holder member.

  The sheet feeding device may further include urging means for urging the holder member toward the sheet feeding roller and bringing the separation roller into contact with the sheet feeding roller, and the holder member may be arranged to be swingable.

  The urging means may include a spring member, and the spring member may be disposed at a position facing a substantially central portion between the support position of the holder member that supports the shaft and the support position of the connecting portion that supports the shaft.

  The sheet feeding device further includes a driving force transmitting means for transmitting a driving force to the shaft and rotating the separation roller in a direction opposite to the rotation direction of the sheet feeding roller, the separation roller, the shaft, the holder member, the regulating member, and A part of the driving force transmitting means is configured as a support unit, and the support unit may be arranged to be swingable.

  The sheet feeding device further includes a guide member that guides one sheet separated from the plurality of sheets by the sheet feeding roller and the separation roller to the downstream side in the sheet traveling direction. The support unit may be detachably attached to the recess of the guide member.

  The sheet feeding device further includes an opening / closing guide member that covers a concave portion of the guide member and constitutes a part of a guide surface for guiding the sheet, and the opening / closing guide member may be rotatably attached to the guide member. Good.

  According to the present invention, it is possible to provide a paper feeding device in which the separation roller is in contact with the paper feeding roller as uniformly as possible and the separation roller can be easily replaced.

1 is a cross-sectional view illustrating the entire configuration of a document reading apparatus main body and a document conveying apparatus according to an embodiment of the present invention. It is a perspective view for demonstrating the internal structure of the paper feeder which concerns on embodiment of this invention. It is a perspective view which shows the state which removed the control member to which the connection part is attached from the shaft. It is a perspective view which shows the state which removed the regulating member and the separation roller from the shaft. It is a top view of the control member in which the connection part is formed. It is the 1st figure which shows the state which the 1st connection part of the connection part and the 1st convex part of the holder member connected, and the 2nd connection part of the connection part and the 2nd convex part of the holder member connected. It is a 2nd figure which shows the state which the 1st connection part of the connection part and the 1st convex part of the holder member connected, and the 2nd connection part of the connection part and the 2nd convex part of the holder member were connected. It is a figure which shows the state by which the separation roller, the shaft, the holder member, the regulation member, etc. were unitized. It is explanatory drawing which shows arrangement | positioning of the spring member which urges | biases a support unit upwards.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the entire configuration of a document reading apparatus main body H and a document conveying apparatus A according to an embodiment of the present invention.

  As shown in FIG. 1, the document reading apparatus includes a document reading apparatus main body H and a document conveying apparatus A, and the document conveying apparatus A is attached to the document reading apparatus main body H via a hinge (not shown). The hinge supports the document conveying device A so that it can be opened and closed with respect to the upper surface of the document reading device main body H.

  The document reading device main body H includes a first reading unit 32 for reading one surface of a document conveyed to the upper surface of the first contact glass 31a by the document conveying device A. The document conveying device A includes a second reading unit 33 for reading the other surface of the document that has passed through the upper surface of the first contact glass 31a of the document reading device main body H.

  The document conveying device A is attached to the document reading device main body H so that the upper surface of the document reading device main body H can be opened and closed, and is placed on the second contact glass 31b of the document reading device main body H. The original is read by moving the first reading unit 32.

  The first reading unit 32 provided in the document reading apparatus main body H is a unit in which a light source, a plurality of mirrors, a lens, and photoelectric conversion means including a photoelectric conversion element (CCD) are integrated. The first reading unit 32 irradiates the conveyed original with light from the light source via the first contact glass 31a, reflects the reflected light from the original with a mirror, and collects it on the photoelectric conversion means via the lens. The original is read by performing photoelectric conversion by the photoelectric conversion means. The first reading unit 32 reads a document such as a book placed on the second contact glass 31b by moving in the sub-scanning direction.

  As shown in FIG. 1, the document conveying apparatus A includes a paper feed tray 40 on which a plurality of documents can be placed, and a paper discharge tray 41 that stores the read documents. The paper feed tray 40 is disposed so as to overlap above the paper discharge tray 41, and a regulating wall 72 that regulates the leading edge of the document placed on the paper feed tray 40 is provided downstream of the paper feed tray 40. The paper feed tray 40 is provided so as to be connected to a U-shaped document conveyance path 42 described later.

  The document transport path 42 is a U-shaped path from the paper feed tray 40 to the paper discharge tray 41. In the document conveyance path 42, a feeding roller 43, a paper feed roller 4, a separation roller 5, a registration roller pair 46, a first conveyance roller pair 47, a second conveyance roller pair 48, and a paper discharge roller A pair 49 is provided.

  The feeding roller 43 is a roller for coming into contact with a document placed on the paper feed tray 40 and whose tip is regulated by the regulation wall 72 and feeding the document. The paper feed roller 4 is a roller for feeding the fed document. The separation roller 5 is a roller that presses against the paper feed roller 4 and separates one original from a plurality of originals. The registration roller pair 46 is a roller pair including registration rollers 46A and 46B that feed the document downstream after regulating the leading edge of the document that is separated and fed by the paper feed roller 4 and the separation roller 5. . The first transport roller pair 47 is a roller that is disposed on the upstream side of the first contact glass 31a and transports the document downstream. The second transport roller pair 48 is a roller that is disposed on the downstream side of the first contact glass 31a and transports the document downstream. The paper discharge roller pair 49 is a roller pair that is disposed on the downstream side of the second transport roller pair 48 and discharges the paper to the paper discharge tray 41.

  The document transport path 42 includes an upstream path, an intermediate path, and a downstream path. The upstream path is a path from the paper feed opening 42 a through which the original on the paper feed tray 40 is fed to the registration roller pair 46. The intermediate path is a curved path from the registration roller pair 46 to the first contact glass 31a. The downstream path is a path from the first contact glass 31 a to the paper discharge port 42 b near the paper discharge roller pair 49.

  The feeding roller 43, the paper feed roller 4 and the registration roller 46 </ b> A are unitized together with the paper feed cover 71 of the document conveying apparatus A to form a paper feed cover unit 60. The separation roller 5, the guide surface 75 on the upstream side of the document conveyance path 42, and the regulation wall 72 of the paper feed tray 40 are also unitized to form a separation guide unit 80.

  As described above, the document feeder A has the second reading unit 33 for reading the document surface opposite to the document surface read by the first reading unit 32. The second reading unit 33 is disposed in an area inside the U-shaped document conveyance path 42. The second reading unit 33 includes a third contact glass 50 disposed between the second transport roller pair 48 and the paper discharge roller pair 49. The second reading unit 33 reads a document that passes through the surface of the third contact glass 50.

  With the above-described configuration, the feeding roller 43 feeds the document on the sheet feeding tray 40, and the sheet feeding roller 4 and the separation roller 5 separate the plurality of documents into one document. The registration roller pair 46 regulates the leading edge of the separated document, and the first transport roller pair 47 transports the document to the first contact glass 31a. The second transport roller pair 48 transports the document that has passed through the first contact glass 31 a to the downstream side, and the paper discharge roller pair 49 discharges the paper to the paper discharge tray 41. In the process of conveying the original, the first reading unit 32 reads the surface of the original when the original passes through the first contact glass 31 a, and the second reading when the original passes through the third contact glass 50. The unit 33 reads the back side of the document.

  Next, the paper feeding device 1 applied to the paper feeding mechanism of the document conveying device mounted on the document reading device main body H will be described. FIG. 2 is a perspective view for explaining the internal structure of the sheet feeding device 1 according to the embodiment of the present invention.

  The conveyance guide means that forms the conveyance path of the paper feed mechanism includes a guide member 2 in which a recess 2 a is formed, and an open / close guide member 3 that covers the recess 2 a in the guide member 2. The open / close guide member 3 is rotatably attached to the guide member 2 so that the recess 2a in the guide member 2 can be covered and the recess 2a can be exposed to the outside of the apparatus. That is, as shown in FIG. 2, the opening / closing guide member 3 is rotated from a state where the recess 2a of the guide member 2 is covered, and the components inside the recess 2a are exposed to the outside of the apparatus. When the opening / closing guide member 3 covers the recess 2a, the opening / closing guide member 3 constitutes a part of a guide surface for guiding the sheet to the downstream side in the traveling direction of the sheet. Hereinafter, “downstream side in the sheet traveling direction” is referred to as “downstream side”.

  The separation mechanism includes a sheet feed roller 4 that rotates to feed a sheet, and a separation roller 5 that contacts the sheet feed roller 4 and rotates in a direction opposite to the rotation direction of the sheet feed roller 4. As described with reference to FIG. 1, the paper feed roller 4 and the separation roller 5 separate sheets one by one from a plurality of sheets and convey them downstream. The guide member 2 is one member that guides a sheet separated from a plurality of sheets by the sheet feeding roller 4 and the separation roller 5 to one downstream.

  The support unit 15 includes a shaft 6, a holder member 7, and a regulating member 8. The separation roller 5 is detachably attached to the shaft 6. The holder member 7 supports one end side of the shaft 6. The “one end side” is the side where the regulating member 8 is not attached to the shaft 6 with reference to the separation roller 5. The “other end side” to be described later is the side on the shaft 6 on which the regulating member 8 is attached with reference to the separation roller 5. The regulating member 8 is detachably attached to the other end of the shaft 6, and regulates the position of the separation roller 5 attached to the shaft 6 to a position where the separation roller 5 can come into contact with the paper feed roller 4. Furthermore, the restricting member 8 is configured to be removable from the other end side of the shaft 6. The restricting member 8 is provided with a connecting portion 9. The connecting portion 9 is detachably attached to the holder member 7. The connecting portion 9 is attached to the holder member 7 after the regulating member 8 is attached to the shaft 6, and supports the other end side of the shaft 6 together with the holder member 7. More specifically, the connecting portion 9 supports the other end side of the shaft 6 by being connected to the holder member 7 by attaching the regulating member 8 to the shaft 6. The connecting portion 9 is also for positioning the separation roller 5 with respect to the holder member 7.

  The separation roller 5, the shaft 6, the holder member 7, and the regulating member 8 will be further described with reference to FIGS. FIG. 3 is a perspective view showing a state in which the regulating member 8 on which the connecting portion 9 is formed is removed from the shaft 6. FIG. 4 is a perspective view showing a state in which the regulating member 8 and the separation roller 5 are removed from the shaft 6. 3 and 4, one end side of the shaft 6 is supported by the holder member 7.

  FIG. 5 is a plan view of the regulating member 8 provided with the connecting portion 9. In FIG. 5, the restriction member 8 is expressed in a state viewed from the one end side of the shaft 6 toward the other end side when the restriction member 8 is attached to the shaft 6.

  As shown in FIGS. 3, 4 and 5, the connecting portion 9 has a first connecting portion 9a and a second connecting portion 9b. That is, the first connecting portion 9 a and the second connecting portion 9 b are provided on the regulating member 8. The first connecting part 9a and the second connecting part 9b are like one and the other when the cylinder is cut in half along the plane including its axis, and have the same configuration as the other party. 3 and 4, the first connecting portion 9a is such that the concave first receiving portion 90a faces vertically upward. The second connecting portion 9b is such that the concave second receiving portion 90b faces vertically downward.

  The 1st connection part 91a is provided in the 1st connection part 9a. 3 and 4, the first connecting portion 91a is expressed as projecting upward from the first receiving portion 90a, and has a shape in which one portion of the ring is missing. 3 and 4, the first connection portion 91 a is expressed in a state in which one portion above the vertical direction is missing. The second connecting portion 9b is also provided with a second connecting portion 91b as shown in FIG. The second connecting portion 91b is expressed as projecting upward from the second receiving portion 90b in FIG. 5, and has a shape in which one portion of the ring is missing.

  As shown in FIG. 5, the regulating member 8 is formed with a recess 8 c into which the other end side of the shaft 6 is fitted. The connecting portion 9 is formed with a first abutting portion 9 d that contacts a part of the holder member 7 when the regulating member 8 is attached to the shaft 6.

  As shown in FIGS. 3 and 4, the holder member 7 has a first convex portion 7 a and a second convex portion 7 b that extend from one end side of the shaft 6 to the other end side. The 1st convex part 7a is a member connected with the 1st connection part 9a in the connection part 9, and the 2nd convex part 7b is a member connected with the 2nd connection part 9b in the connection part 9. FIG. A first constricted portion 70a, which is a constricted portion, is formed on the first convex portion 7a. A second constricted portion 70b, which is a constricted portion, is also formed on the second convex portion 7b. When the regulating member 8 is attached to the shaft 6, the first connecting portion 9 a and the first protruding portion so that the first connecting portion 9 a in the connecting portion 9 and the first protruding portion 7 a in the holder member 7 can be connected. 7a is provided. The second connecting portion 9b of the connecting portion 9 and the second convex portion 7b of the holder member 7 are also connected to each other when the restricting member 8 is attached to the shaft 6 so that they can be connected to each other. And the 2nd convex part 7b is provided.

  3 and 4, the holder member 7 has a second contact portion 7 c that faces the bottom of the recess 2 a in the guide member 2. The second abutting portion 7c is like a part of the side surface of the cylinder, and comes into contact with the first abutting portion 9d in the connecting portion 9 when the regulating member 8 is attached to the shaft 6 from the vertically lower side. The first contact portion 9d is supported.

  Next, a process of attaching the separation roller 5 and the regulating member 8 provided with the connecting portion 9 to the shaft 6 supported at one end by the holder member 7 will be described. First, the separation roller 5 is attached to the shaft 6 from the other end side of the shaft 6. The separation roller 5 is a roller that is detachably attached to the shaft 6. Therefore, the separation roller 5 can be easily attached to the shaft 6.

  Next, the regulating member 8 is attached to the shaft 6 from the other end side of the shaft 6 so that the concave portion 8 c formed in the regulating member 8 faces the end portion on the other end side of the shaft 6. The end on the end side is fitted into the recess 8c. When the end portion on the other end side of the shaft 6 is fitted into the recess 8c, the position of the separation roller 5 attached to the shaft 6 is regulated. That is, when the end portion on the other end side of the shaft 6 is fitted into the recess 8 c, the regulating member 8 regulates the position of the separation roller 5 to a position where the separation roller 5 can come into contact with the paper feed roller 4.

  Next, the regulating member 8 is rotated in the rotation direction CW. Then, the first connecting portion 9 a of the connecting portion 9 comes into contact with the first convex portion 7 a of the holder member 7, and the second connecting portion 9 b of the connecting portion 9 comes into contact with the second convex portion 7 b of the holder member 7. When the regulating member 8 is further rotated in the rotation direction CW, the first constricted portion 70a of the first convex portion 7a is moved from the notch portion formed in the first connecting portion 91a of the first connecting portion 9a to the first connecting portion 91a. Fits in. Since the first connecting portion 91a has a cutout portion only at one place and the first connecting portion 9a is provided with the first receiving portion 90a, the first constricted portion 70a is the first connecting portion. Even if the restricting member 8 is further rotated in the rotational direction CW after being fitted to 91a, the operation of the first connecting portion 9a is restricted by the holder member 7 and does not move. In this way, the first connecting portion 9a and the first convex portion 7a are connected. The connection between the second connection portion 9b of the connection portion 9 and the second convex portion 7b of the holder member 7 is performed in the same manner as the connection between the first connection portion 9a and the first convex portion 7a described above.

  In FIG. 6, the first connecting portion 9 a of the connecting portion 9 and the first convex portion 7 a of the holder member 7 are connected, and the second connecting portion 9 b of the connecting portion 9 and the second convex portion 7 b of the holder member 7 are connected. It is a 1st figure which shows the state connected. In FIG. 7, the first connecting portion 9 a of the connecting portion 9 and the first convex portion 7 a of the holder member 7 are connected, and the second connecting portion 9 b of the connecting portion 9 and the second convex portion 7 b of the holder member 7 are connected. It is a 2nd figure which shows the state connected. FIG. 6 illustrates a state in which the holder member 7 is viewed from one end side of the shaft 6 to the other end side. FIG. 7 illustrates a state in which the connecting portion 9 is viewed from the other end side of the shaft 6 toward the one end side.

  As shown in FIG. 7, when the connection between the first connecting portion 9 a and the first convex portion 7 a is performed, and the connection between the second connecting portion 9 b and the second convex portion 7 b is performed, the first in the connecting portion 9. The contact portion 9d contacts the second contact portion 7c of the holder member 7 so as to ride on it. In other words, the first contact portion 9d supports the second contact portion 7c from below. As such, the first connecting portion 9a and the first convex portion 7a are connected, the second connecting portion 9b and the second convex portion 7b are connected, and the first contact portion 9d and the second convex portion 7b are connected. When the contact portion 7 c comes into contact, the connecting portion 9 is connected to the holder member 7 and supports the other end side of the shaft 6 together with the holder member 7.

  For example, the shaft 6 is recessed in the guide member 2 so that the shaft 6 is positioned at a predetermined position when the first contact portion 9d of the connecting portion 9 and the second contact portion 7c of the holder member 7 are in contact with each other. The first contact portion 9d and the second contact portion 7c are designed so as to be parallel to the bottom surface of 2a. Then, when the connecting portion 9 supports the other end side of the shaft 6 together with the holder member 7, the shaft 6 is restricted to a predetermined position, for example, a position where the shaft 6 is parallel to the bottom surface of the recess 2 a in the guide member 2. Is done. Therefore, it is possible to prevent the shaft 6 from tilting from a predetermined state. Therefore, the separation roller 5 can be pressed against the paper feed roller 4 as uniformly as possible. Therefore, if the sheet feeding device 1 according to the present embodiment is used, the possibility that the sheet separation performance is impaired is reduced, and the sheet conveyance skew hardly occurs.

  Next, the process of removing the separation roller 5 from the shaft 6 will be described. First, the regulating member 8 is rotated in the direction opposite to the rotation direction CW. Then, the connection between the first connecting portion 9a in the connecting portion 9 and the first convex portion 7a in the holder member 7 is released, and the second connecting portion 9b in the connecting portion 9 and the second convex portion 7b in the holder member 7 are released. The connection is also released. Thereby, the connecting portion 9 is detached from the holder member 7. Since the regulating member 8 is detachably attached to the shaft 6, when the connecting portion 9 is detached from the holder member 7, the regulation of the movement of the regulating member 8 toward the other end of the shaft 6 is released. In this state, the regulating member 8 is removed from the other end side of the shaft 6 (see FIG. 3). Since the separation roller 5 is also detachably attached to the shaft 6, when the regulating member 8 is removed from the shaft 6, the regulation of the movement of the separation roller 5 toward the other end of the shaft 6 is released. In this state, the separation roller 5 is removed from the other end side of the shaft 6 (see FIG. 4). As such, the separation roller 5 can be easily detached from the shaft 6. As described above, the separation roller 5 can be easily attached to the shaft 6. That is, in the paper feeding device 1 in the present embodiment, the separation roller 5 can be easily replaced.

  FIG. 8 is a diagram illustrating a state in which the separation roller 5, the shaft 6, the holder member 7, the restriction member 8, and the like are unitized. A gear 10, a first pulley 11, a second pulley 12, a timing belt 13, and a torque limiter 14 are attached to the holder member 7 as a drive transmission mechanism that transmits drive to the separation roller 5. The gear 10 is connected to drive means (drive motor) via a plurality of drive transmission members (not shown), and transmits the drive force generated by the drive motor to the shaft 6 and the like. The first pulley 11 is attached to one end side of the shaft 6, and the second pulley 12 is attached to the gear 10. The timing belt 13 connects the first pulley 11 and the second pulley 12. The torque limiter 14 regulates the rotation of the separation roller 5.

  That is, the gear 10, the first pulley 11, the second pulley 12, the timing belt 13, and the torque limiter 14 constitute a part of the driving force transmission unit that transmits the driving force from the driving unit to the shaft 6 and the like. A part of the driving force transmission means (drive transmission mechanism) is unitized with the separation roller 5, the shaft 6, the holder member 7 and the regulating member 8 to constitute a support unit 15.

  FIG. 9 is a view showing a state in which the support unit 15 in FIG. 8 is attached to the recess 2 a in the guide member 2. As shown in FIG. 9, the support unit 15 has a mounting portion 16, and a mounted portion 2 b is provided on the bottom surface of the recess 2 a in the guide member 2. The support unit 15 is attached to the attached portion 2b of the recess 2a of the guide member 2 with the attachment portion 16 of the support unit 15 as a fulcrum.

  As shown in FIG. 8, the holder member 7 further has a swing shaft 7d. As shown in FIG. 9, the recess 2a of the guide member 2 is provided with a bearing portion 2c that receives the swing shaft 7d so that the swing shaft 7d can swing. A notch is formed above the bearing 2c. When attaching the support unit 15 to the recess 2a of the guide member 2, the swing shaft 7d is fitted into the bearing portion 2c from the notch so that the bearing portion 2c receives the swing shaft 7d. Thereby, the support unit 15 is disposed in the recess 2a of the guide member 2 so as to be swingable.

  As shown in FIGS. 2, 3 and 8, the holder member 7 further includes a regulating piece 7e. As shown in FIGS. 2 and 3, the recess 2a of the guide member 2 is provided with a pair of regulating walls 2d that sandwich the regulating piece 7e. The pair of regulating walls 2d sandwich the regulating piece 7e from both sides in the width direction of the sheet when the sheet advances. When attaching the support unit 15 to the recess 2a, the restriction piece 7e is inserted between the pair of restriction walls 2d. Thereby, the movement of the support unit 15 in the width direction is restricted.

  FIG. 9 is also an explanatory view showing the arrangement of spring members that urge the support unit 15 upward. As shown in FIG. 9, in the guide member 2, the spring member 17 is located at a position facing the substantially central portion between the support position of the holder member 7 that supports the shaft 6 and the support position of the connecting portion 9 that supports the shaft 6. The holder member 7 is biased toward the paper feed roller 4 and has a function of pressing the separation roller 5 against the paper feed roller 4. The spring member 17 is provided at the above-described position and biases the holder member 7 constituting the support unit 15 toward the paper feed roller 4, so that the separation roller 5 is in uniform contact with the paper feed roller 4. Can do. Therefore, the possibility that the sheet separation performance is impaired is reduced, and sheet conveyance skew is less likely to occur.

  As shown in FIGS. 2, 3 and 9, a holding claw 2 e is provided in the recess 2 a of the guide member 2. The holding claw 2e operates the support unit 15 so that the support unit 15 does not jump out of the recess 2a in the guide member 2 by a spring when the paper supply unit is closed and the paper supply roller 4 is separated from the separation roller 5. regulate. During normal operation, since the separation roller 5 is in contact with the paper feed roller 4, the holding claw 2e does not act.

  In the above-described embodiment, the connecting portion 9 is provided on the regulating member 8. However, the connecting portion 9 is separate from the regulating member 8 and is detachably attached to the regulating member 8. It may be. In any case, the holder member 7, the regulating member 8, and the connecting portion 9 are not limited to those described in the above embodiment, and the regulating member 8 is detachably attached to the other end side of the shaft 6. The position of the separation roller 5 attached to the shaft 6 is restricted to a position where the separation roller 5 can come into contact with the paper feed roller 4. The connecting portion 9 is provided on the regulating member 8 by being integrated with the regulating member 8 or by being attached to the regulating member 8 with a screw or the like. Further, the connecting portion 9 is attached to the holder member 7 after the regulating member 8 is attached to the shaft 6, and supports the other end side of the shaft 6 together with the holder member 7.

  In the above-described embodiment, the separation roller 5 that presses against the sheet feeding roller 4 and separates the sheet is a roller that rotates in the direction opposite to the sheet feeding direction, but may be a fixed roller that is fixed without rotating. Good.

  The present invention is not limited to the embodiments described above, and various modifications can be made to the embodiments based on the spirit of the present invention, and modifications are not excluded from the technical scope of the present invention.

  Since the present invention relates to a paper feeder, it has industrial applicability.

H Document reading apparatus main body A Document conveying apparatus 1 Paper feeding apparatus 2 Guide member 2a Recessed part 2b Mounted part 2c Bearing part 2d A pair of regulating walls 2e Holding claw 3 Opening / closing guide member 4 Feeding roller 5 Separating roller 6 Shaft 7 Holder member 7a 1st convex part 7b 2nd convex part 7c 2nd contact part 7d Swing axis 7e Restriction piece 8 Restriction member 8c Recess 9 Connection part 9a 1st connection part 9b 2nd connection part 9d 1st contact part 10 Gear 11 1st 1 pulley 12 second pulley 13 timing belt 14 torque limiter 15 support unit 16 mounting portion 17 spring member 31a first contact glass 31b second contact glass 32 first reading unit 33 second reading unit 40 paper feed tray 41 Paper discharge tray 42 Document transport path 42a Paper feed opening 42b Paper discharge opening 43 Feeding roller 46 Registration roller pair 46A, 46B Registration Roller 47 First transport roller pair 48 Second transport roller pair 49 Paper discharge roller pair 50 Third contact glass 60 Paper feed cover unit 70a First constriction 70b Second constriction 71 Paper feed cover 72 Restriction wall 75 Guide surface 80 Separating guide unit 90a First receiving portion 90b Second receiving portion 91a First connecting portion 91b Second connecting portion CW Rotation direction

Claims (7)

A paper feed roller that rotates and feeds the sheet;
A separation roller that is in pressure contact with the sheet feeding roller and separates the sheet;
A shaft to which the separation roller is detachably attached;
A holder member for supporting one end of the shaft;
A regulation member that is detachably attached to the other end side of the shaft, and that regulates the position of the separation roller attached to the shaft to a position where the separation roller can come into contact with the paper feed roller,
The restricting member is configured to be removable from the other end side of the shaft, and a connecting portion that supports the other end side of the shaft by connecting the restricting member to the shaft and supporting the other end side of the shaft. A sheet feeding device provided on a regulating member.   The sheet feeding device according to claim 1, wherein the connecting portion positions the separation roller with respect to the holder member. Urging means for urging the holder member toward the paper feed roller and bringing the separation roller into contact with the paper feed roller;
The sheet feeding device according to claim 1, wherein the holder member is arranged to be swingable. The biasing means has a spring member,
The said spring member is arrange | positioned in the position facing the substantially center part of the support position of the said holder member which supports the said shaft, and the support position of the said connection part which supports the said shaft. The paper feeder described in 1. A driving force transmitting means for transmitting a driving force to the shaft and rotating the separation roller in a direction opposite to a rotation direction of the paper feed roller;
The separation roller, the shaft, the holder member, the regulating member, and a part of the driving force transmission means are configured as a support unit,
The sheet feeding device according to claim 1, wherein the support unit is arranged to be swingable. A guide member for guiding one sheet separated from the plurality of sheets by the sheet feeding roller and the separation roller to the downstream side in the sheet traveling direction;
The guide member has a recess,
The sheet feeding device according to claim 5, wherein the support unit is detachably attached to the concave portion of the guide member. An opening / closing guide member that covers the concave portion of the guide member and constitutes a part of a guide surface for guiding the sheet;
The sheet feeding device according to claim 6, wherein the opening / closing guide member is rotatably attached to the guide member.

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