JP2016175746A - Reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reading device that reduces the risk of extending a read image or stopping conveyance due to a slip of a conveying roller, because a nipping force for making a driven roller nip the conveying roller is insufficient.SOLUTION: A first tangent at a contact point between a reverse roller and a paper feeding roller crosses a second tangent at a contact point between a driven roller and a conveying roller. A first cabinet side bottom surface of an auxiliary roller provided between the reverse roller and the driven roller is positioned on the first cabinet side with respect to a fourth tangent of the paper feeding roller passing through the driven roller side tip of a guide surface.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a reading device that can read a highly rigid conveyed product such as a card.

  2. Description of the Related Art Conventionally, as a reading device, a paper conveying device including a paper table, a paper feeding roller, a retard roller, a first conveying roller, a first driven roller, an imaging unit, a second conveying roller, and a second driven roller is disclosed in Patent Document 1 Are known. Only the sheet in contact with the sheet feeding roller on the sheet table is fed by the retard roller disposed opposite to the sheet feeding roller. The fed paper is conveyed to the imaging unit by a first conveyance roller and a first driven roller disposed on the upstream side of the imaging unit. An image of the surface of the sheet conveyed to the imaging unit is read by the imaging unit. The sheet on which the image has been read is discharged out of the sheet conveying apparatus by the second conveying roller and the second driven roller arranged on the downstream side of the imaging unit. It is also known that the first driven roller is biased by the first transport roller, and the second driven roller is biased by the second transport roller.

JP 2014-47050 A

  In general, in a reading apparatus, it is conceivable that a tangent line at a contact point between a retard roller and a paper feed roller is directed from the horizontal direction to the lower side, and an inclination angle with respect to the horizontal direction is provided on the paper table. As a result, the force in the transport direction due to the weight of the paper loaded on the paper table is increased, and the frictional force with the lower paper is reduced, so that the lower paper is easily separated from the upper paper. On the other hand, it is conceivable to extend the conveyance path between the first conveyance roller and the second conveyance roller in the horizontal direction by directing the tangent line at the contact point between the first driven roller and the first conveyance roller in the horizontal direction. As a result, the document discharged out of the sheet conveying device by the second conveying roller and the second driven roller is not easily jammed, and the sheet can be discharged efficiently.

  When the paper table is provided with an inclination angle with respect to the horizontal direction and the conveyance path in the vicinity of the imaging unit is extended in the horizontal direction, the tangent line at the contact point between the reverse roller and the paper feed roller is between the first driven roller and the first conveyance roller. Intersects the tangent at the contact. That is, the conveyance path is bent. In the bent conveyance path, there is a possibility that a sheet such as a card having a high rigidity by the paper feed roller pushes up the first driven roller biased toward the first conveyance roller. As a result, the nip force with which the first driven roller pinches the first transport roller is insufficient, and the read image may be extended or the transport may be stopped due to the slip of the first transport roller.

  SUMMARY An advantage of some aspects of the invention is that it provides a reading apparatus that reduces the possibility that a read image is stretched or the conveyance is stopped due to slippage of a conveyance roller.

  In order to achieve the above object, a reading apparatus according to claim 1 is provided with a first housing having a transport surface, and a paper feed roller provided in the first housing and arranged to be exposed from the transport surface. A second housing disposed to face the first housing, a reverse roller provided in the second housing and disposed at a position facing the paper feed roller, and the first housing. A conveying roller disposed to be exposed from the conveying surface, a driven roller provided in the second housing and rotated in accordance with the conveying roller, and biasing the driven roller to the conveying roller An urging member, an auxiliary roller provided in the second casing and disposed between the reverse roller and the driven roller, and an auxiliary roller provided in the second casing and relative to the driven roller. The reading surface is formed on the opposite side of the transparent member. And a guide surface that is provided in the reading unit and extends from the reading surface toward the driven roller, and a first tangent at a contact point between the reverse roller and the paper feeding roller is the driven roller Intersecting the second tangent at the contact point between the roller and the conveying roller, and the bottom surface of the auxiliary roller on the first housing side is more than the third tangent of the paper feed roller passing through the tip of the guide surface on the driven roller side It is located on the first housing side.

  Further, the bottom surface of the auxiliary roller may be separated within a range of 1.4 mm from the fourth tangent line of the paper feed roller and the transport roller.

  The bottom surface of the auxiliary roller may be positioned closer to the second housing than a fourth tangent line between the paper feed roller and the transport roller.

  The auxiliary roller may be fixed to the second housing.

  Further, in the direction of the rotation axis of the paper feed roller, the inner end of the auxiliary roller is located outside the inner end of the paper feed roller, and the outer end of the auxiliary roller is the feed roller. It may be located outside the outer edge of the paper roller and inside the outer edge of the transport roller.

  According to the present invention, the first tangent at the contact point between the reverse roller and the feed roller intersects the second tangent line at the contact point between the driven roller and the transport roller, and the bottom surface of the auxiliary roller on the first housing side is the guide surface. Is positioned closer to the first housing than the third tangent of the paper feed roller passing through the tip of the driven roller. As a result, the bottom surface of the auxiliary roller is in contact with the highly rigid paper while the leading edge is sandwiched between the transport roller and the driven roller, and the trailing edge is sandwiched between the paper feed roller and the reverse roller, and the rigid paper is bent. Therefore, it is possible to reduce the force with which the sheet having strong rigidity pushes the driven roller in the counter-biasing direction. As a result, it is possible to reduce the possibility that the read image is extended or the conveyance stops due to the slip of the conveyance roller.

1 is a perspective view of a reading device 1. FIG. FIG. 6 is a perspective view of the reading device 1 with a second housing 12 removed. 3 is a perspective view of a paper feed roller 41, a reverse roller 46, a pressing mechanism 50, and the like. FIG. 4 is a perspective view of a drive mechanism 70. FIG. FIG. 3 is a cross-sectional view of the reading device 1 at a position slightly shifted to the right from the center line 11C shown in FIG. It is an enlarged view of sectional drawing shown in FIG. FIG. 10 is an explanatory diagram illustrating a state in which a sheet having high rigidity is conveyed. It is explanatory drawing explaining the relationship between the paper feed roller 41 and the 2nd guide surface 932B. FIG. 6 is a schematic explanatory diagram showing a positional relationship among auxiliary rollers 90, separation rollers 41, and conveying rollers 91.

<1. Schematic Configuration of Reading Device 1>
An embodiment embodying the present disclosure will be described with reference to the drawings. As shown in FIGS. 1 and 2, the reading apparatus 1 includes a housing 10, a paper feed tray 16, and a paper discharge tray 18. In FIG. 2, a second housing 12 described later is omitted from the housing 10. In the following description, the upper side, the lower side, the left diagonal upper side, the right diagonal lower side, the left diagonal lower side, and the right diagonal upper side of FIG. The front side and the rear side.

  As shown in FIG. 1, the housing 10 includes a first housing 11 and a second housing 12. Each shape of the 1st housing | casing 11 and the 2nd housing | casing 12 is substantially box shape. As shown in FIG. 2, the first housing 11 has an upper surface 11A. The upper surface 11A is inclined downward as it goes from the rear side to the front side. The first housing 11 has a support member 11B. The support member 11B forms part of the center and rear side in the left-right direction of the upper surface 11A. The support member 11B is disposed around a paper feed roller 41 and a set guide 86 which will be described later. The first housing 11 rotatably supports the lower end of the second housing 12 at both left and right ends of the lower end of the upper surface 11A. The second housing 12 is rotatable around a virtual straight line extending in the left-right direction along the lower end. The upper surface 11A is an example of the transport surface of the present invention.

  In the following description, a virtual straight line that passes through the center of the upper surface 11A in the left-right direction and extends along the upper surface 11A is referred to as a center line 11C. Unless otherwise specified, clockwise and counterclockwise indicate the rotation direction when viewed from the right side.

  As shown in FIG. 1, the second housing 12 has an upper side surface 12 </ b> B that forms the upper surface of the housing 10. A display 121 and an operation unit 122 are provided on the upper side surface 12B. The operation unit 122 is a plurality of push buttons capable of inputting instructions to the reading device 1. The display 121 and the operation unit 122 are electrically connected to the control unit 131. For example, the control unit 131 is disposed on the back side of the upper side surface 12B of the second housing 12. The control unit 131 includes a CPU that controls the reading device 1 and a storage unit that stores a program for the CPU to control the image reading device 1.

  The upper end of the second housing 12 and the upper surface 11A shown in FIG. 2 form a paper feed port 10A at a portion sandwiched between them. The lower end of the second housing 12 and the upper surface 11A shown in FIG. 2 form a paper discharge port 10B at a portion sandwiched between them. A lower surface 12A and an upper surface 11A of the second housing 12 to be described later form a conveyance path 20 shown in FIGS. That is, the second housing 12 is disposed to face the first housing 11 in the up-down direction. The conveyance path 20 is connected to the outside of the housing 10 by a paper feed port 10A and a paper discharge port 10B.

  As shown in FIGS. 1 and 2, the paper feed tray 16 includes paper feed units 161, 162, and 163. The shapes of the paper feeding units 161 to 163 are substantially plate-like. The paper feeding unit 161 extends from the rear side of the paper feeding port 10 </ b> A in the first housing 11 toward the upper rear side. The upper surface of the paper supply unit 161 is referred to as a tray surface 171. Guides 165 are provided on the left and right sides of the tray surface 171 of the paper supply unit 161. The guide 165 can move in the left-right direction along the tray surface 171. The guide 165 aligns the horizontal position of the paper placed on the paper supply unit 161 with the horizontal center. The paper feeding unit 162 extends from the upper end of the paper feeding unit 161 toward the upper rear side. The paper feed unit 163 extends rearward and obliquely upward from the upper end of the paper feed unit 162. The sheet feeding units 162 and 163 are movable in the rear oblique upper side and the front oblique lower side.

  As illustrated in FIG. 1, the paper discharge tray 18 includes paper discharge units 181, 182, and 183. The paper discharge units 181 to 183 have a substantially plate shape. The paper discharge unit 181 extends from the lower side of the paper discharge port 10B of the first housing 11 toward the front side. The paper discharge unit 182 extends from the front end of the paper discharge unit 181 toward the front side. The paper discharge unit 183 extends from the front end of the paper discharge unit 182 toward the front side. The paper discharge units 181 to 183 are movable in the front-rear direction.

  As shown in FIG. 2, the first casing 11 is provided with paper feed rollers 411 and 412, transport rollers 911 and 912, and paper discharge rollers 921 and 922. In the following description, the paper feed rollers 411 and 412 may be collectively referred to as the paper feed roller 41. The conveyance rollers 911 and 912 may be collectively referred to as the conveyance roller 91 in some cases. The paper discharge rollers 921 and 922 may be collectively referred to as a paper discharge roller 92 in some cases. The paper feed roller 41, the transport roller 91, and the paper discharge roller 92 are arranged in order from the rear oblique upper side to the front oblique lower side along the upper surface 11A. The paper feed roller 411, the transport roller 911, and the paper discharge roller 921 are arranged on the left side of the center line 11C. The paper feed roller 412, the transport roller 912, and the paper discharge roller 922 are disposed on the right side of the center line 11C.

  The image reading unit 93 is a known contact image sensor. The image reading unit 93 is provided between the transport roller 91 and the paper discharge roller 92 in the first upper surface 11 </ b> A of the first housing 11. The image reading unit 93 is electrically connected to the control unit 131 shown in FIG. The image reading unit 93 reads an image of a sheet conveyed in the paper feeding direction. The image reading unit 93 outputs the read image data to the control unit 131.

  The paper feed roller 41 will be described. As shown in FIG. 3, the axial direction of the paper feed rollers 411 and 412 faces the left-right direction. The feed rollers 411 and 412 have substantially the same shape. As shown in FIGS. 3 and 4, a shaft member 42, which is a rotation shaft of the paper feed roller 41, is inserted through the center of the paper feed roller 41 as viewed from the right side.

  As shown in FIG. 3, a virtual straight line extending in the left-right direction along the center of the shaft member 42 is referred to as a virtual line 42P. In response to the rotation of the shaft member 42, the paper feed roller 41 rotates in the paper feed direction with the virtual line 42P as the rotation axis. That is, the rotation axis direction of the paper feed roller 41 is the left-right direction. As shown in FIGS. 2 and 5, a part of the paper feed roller 41 protrudes above the upper surface 11A of the first housing 11 and is exposed from the upper surface 11A.

  The conveyance roller 91 and the paper discharge roller 92 will be described. As shown in FIG. 2, the axial direction of the transport roller 91 and the paper discharge roller 92 is the left-right direction. The conveyance rollers 911, 912, 921, and 922 have substantially the same shape. A shaft member 91 </ b> A shown in FIG. 4, which is the rotation shaft of the transport roller 91, is inserted through the center of the transport roller 91 as viewed from the right side. A shaft member 92A, which is a rotation shaft of the paper discharge roller 92 shown in FIG. The conveyance roller 91 and the paper discharge roller 92 rotate according to the rotation of a drive shaft 725 of a second motor 72 described later shown in FIG. As shown in FIGS. 2 and 5, a part of the transport roller 91 and the paper discharge roller 92 protrude from the upper surface 11A of the first housing 11 to the upper side of the upper surface 11A and are exposed from the upper surface 11A. In the following description, in the direction orthogonal to the upper surface 11A, the direction from the second housing 12 to the first housing 11 is referred to as the first direction, and the direction from the first housing 11 to the second housing 12 is referred to. This is called the second direction.

  As shown in FIG. 3, reverse rollers 461 and 462 are arranged on the second direction side with respect to the paper feed rollers 411 and 412. That is, as shown in FIG. 5, the reverse roller 46 is provided in the second housing 12 so as to face the paper feed roller 41. As shown in FIG. 3, the reverse rollers 461 and 462 have substantially the same shape. The axial direction of the reverse roller 46 faces the left-right direction. In the following description, the reverse rollers 461 and 462 are collectively referred to as “reverse roller 46”.

  As shown in FIG. 3, a shaft member 47, which is a rotation shaft of the reverse roller 46, is disposed in the center portion when viewed from the right side of the reverse roller 46. The shaft member 47 is rotatably supported by the second housing 12 shown in FIG. As shown in FIG. 3, the reverse roller 46 is connected to the shaft member 47 via a torque limiter 482. A gear 481 is connected to the right end of the shaft member 47. The shaft member 47 rotates according to the rotation of a drive shaft 725 of the second motor 72 described later shown in FIG.

  A part of the reverse roller 46 protrudes from the lower surface 12 </ b> A of the second housing 12. As shown in FIG. 3, the reverse rollers 461 and 462 are in contact with the paper feed rollers 411 and 412, respectively. The reverse rollers 461 and 462 are biased by a biasing member (not shown) and are pressed against the paper feed rollers 411 and 412. In the following description, a virtual straight line shown in FIG. 3 extending in the left-right direction along the center of the shaft member 47 is referred to as a “virtual line 47P”. The reverse roller 46 rotates with the virtual line 47 </ b> P as the rotation axis in accordance with the rotation of the shaft member 47. The reverse roller 46 can be rotated in the paper feeding direction and the counter paper feeding direction by a driving force of a first motor 71 described later shown in FIG.

<2. Structure of drive mechanism 70>
As shown in FIG. 4, the drive mechanism 70 includes a first motor 71, a second motor 72, and transmission mechanisms 71 </ b> A, 72 </ b> A, 73 and 74. The first motor 71, the second motor 72, and the transmission mechanisms 71 </ b> A, 72 </ b> A, 73 are provided in the first housing 11. The transmission mechanism 74 is provided in the second housing 12.

  The first motor 71 is provided on the right side in the first housing 11. The drive shaft of the first motor 71 extends to the right side. The transmission mechanism 71A includes gears 711, 712, 713 and the like, a belt (not shown), and a shaft member 42. The gears 711 to 713 and the belt are disposed on the right side of the first motor 71 and rotate in response to the drive shaft of the first motor 71 rotating. The gear 713 is connected to the right end of the shaft member 42. The driving force of the first motor 71 is transmitted to the paper feed roller 41 via the transmission mechanism 71A. That is, the transmission mechanism 71 </ b> A can transmit a driving force that rotates in the sheet feeding direction to the sheet feeding roller 41.

  The second motor 72 is provided on the left part of the first housing 11. The drive shaft 725 of the second motor 72 extends to the left side. As will be described later, when the drive shaft 725 rotates in the reverse direction, the transport rollers 91 and 92 rotate in the paper feeding direction, and the reverse roller 46 rotates in the counter paper feeding direction.

  The transmission mechanism 72 </ b> A is provided on the left side of the second motor 72. The transmission mechanism 72A includes gears 721 and 722, and a belt 723. The belt 723 is bridged between the gears 721 and 722. The gears 721 and 722 and the belt 723 rotate according to the rotation of the drive shaft 725 of the second motor 72.

  The gear 721 is connected to the left end of the shaft member 91 </ b> A of the transport roller 91. The gear 722 is connected to the left end of the shaft member 92 </ b> A of the paper discharge roller 92. The driving force of the second motor 72 is transmitted to the shaft members 91A and 92A via the transmission mechanism 72A. Accordingly, the transport rollers 91 and 92 rotate according to the rotation of the second motor 72.

  The transmission mechanism 73 includes gears 73A, 73B, 73C, and 73D. The gear 73A and gear 73B, the gear 73B and gear 73C, and the gear 73C and gear 73D mesh with each other. The gear 73 </ b> A is connected to the right end of the shaft member 91 </ b> A of the transport roller 91. The gears 73A to 73D rotate according to the rotation of the shaft member 91A.

  The transmission mechanism 74 has gears 74A, 74B, 74C, 74D, 74E, 471, 472, 481, and a torque limiter 482. The gear 74A meshes with the gear 73D of the transmission mechanism 73 in a state where the second housing 12 is disposed at the closed position shown in FIG. The gear 74 </ b> A is separated from the gear 73 </ b> D of the transmission mechanism 73 in a state where the second housing 12 is disposed at an open position (not shown). In the following description, it is assumed that the second housing 12 is disposed at the closed position. The gear 74A and gear 74B, the gear 74B and gear 74C, the gear 74C and gear 74D, and the gear 74D and gear 74E mesh with each other. Gears 471 and 472, 472 and 481 shown in FIG. 3 mesh with each other. A rotation shaft 470 of the gear 471 extends to the right and is connected to a gear (not shown) included in the transmission mechanism 74.

  Gear 74B is a gear (not shown) included in transmission mechanism 74, gears 471. The reverse roller 46 is connected to the shaft member 47 shown in FIG. 3 through a gear 472, a gear 481, and a torque limiter 482. The driving force of the second motor 72 is transmitted to the reverse roller 46 via the transmission mechanism 72A, the shaft member 91A, the transmission mechanism 73, the gears 74A, 74B, 481, and the torque limiter 482.

  When the drive shaft 725 of the second motor 72 rotates in the reverse direction, the driving force of the second motor 72 is transmitted to the shaft member 47 shown in FIG. 3, and the reverse roller 46 rotates counterclockwise, that is, in the anti-paper feeding direction. . When the drive shaft 725 of the second motor 72 rotates in the forward direction, the driving force of the second motor 72 is transmitted to the shaft member 47 shown in FIG. 3, and the reverse roller 46 rotates clockwise, that is, in the paper feeding direction.

  The torque limiter 482 connects the shaft member 47 and the reverse roller 46 in a state where rotational torque less than a predetermined threshold is acting on the reverse roller 46. On the other hand, the torque limiter 482 cuts the shaft member 47 and the reverse roller 46 in a state where a rotational torque greater than a predetermined threshold is applied to the reverse roller 46.

  FIG. 5 is a cross-sectional view of the reading device 1 at a position passing through the paper feed roller 41 in parallel with the center line 11C shown in FIG. As shown in FIG. 5, a driven roller 95 is provided at a position facing the conveyance roller 91. The driven roller 95 is provided in the second housing 12 and is urged toward the conveying roller 91 by the coil spring 951. The coil spring 951 has one end connected to the shaft member 91 </ b> A and the other end fixed to the second housing 12. The driven roller 95 that comes into contact with the conveying roller 91 by the coil spring 951 rotates following the rotation of the conveying roller 91. The coil spring 951 is an example of an urging member of the present invention, and may be another urging member such as a leaf spring.

  A driven roller 96 is provided at a position facing the paper discharge roller 92. The driven roller 96 is provided in the second housing 12 and is urged toward the paper discharge roller 92 by the coil spring 961. One end of the coil spring 961 is connected to the shaft member 92 </ b> A, and the other end is fixed to the second housing 12. The driven roller 96 that contacts the paper discharge roller 92 by the coil spring 961 rotates following the rotation of the paper discharge roller 92. The coil spring 961 may be another urging member such as a leaf spring.

  An auxiliary roller 90 is provided in the second housing 12 between the reverse roller 46 and the driven roller 95. Details of the auxiliary roller 90 will be described later.

  The image reading unit 93 includes a first reading unit 93A and a second reading unit 93B. The first reading unit 93 </ b> A is provided in the first housing 11 between the transport roller 91 and the paper discharge roller 92. The second reading unit 93 </ b> B is provided in the second housing 12 between the driven roller 95 and the driven roller 96. That is, the second reading unit 93 </ b> B is provided on the opposite side of the auxiliary roller 90 with respect to the driven roller 95. Each of the first reading unit 93A and the second reading unit 93B includes a first reading surface 931A and a second reading surface 931B formed of a transparent member. The transparent member may be a transparent material such as glass. The first reading surface 931 </ b> A and the second reading surface 931 </ b> B form part of the transport path 20. The second reading unit 93B is an example of the reading unit of the present invention. The second reading surface 931B is an example of the reading surface of the present invention.

  The first reading unit 93A includes a first guide surface 932A. The first guide surface 932A extends from the first reading surface 931A toward the conveyance roller 91. The second reading unit 93B includes a second guide surface 932B. The second guide surface 932B extends from the second reading surface 931B toward the driven roller 95. The second guide surface 932B is an example of the guide surface of the present invention.

  As shown in FIG. 6, the first tangent line L1 intersects the second tangent line L2. The first tangent line L <b> 1 is a tangent line at the contact point P <b> 1 between the reverse roller 46 and the paper feed roller 41. The second tangent line L2 is a tangent line at the contact point P2 between the driven roller 95 and the conveyance roller 91.

<3. Operation of Reader 1>
An example of the operation of the reading device 1 will be described. When the power of the reading device 1 is turned on, the CPU of the control unit 131 shown in FIG. 1 reads the control program stored in the ROM and develops it in the RAM. The control unit 131 controls the reading device 1 by the CPU of the control unit 131 executing processing based on the control program.

  A case where the operation unit 122 shown in FIG. 1 is operated by the user, or an instruction to start reading paper from a processing device such as a PC (not shown) is input and detected by the control unit 131 will be described. The control unit 131 that has detected an instruction to start reading controls the reading device 1 to perform a reading operation. In the reading operation, the control unit 131 rotates the drive shaft 725 of the second motor 72 in the reverse direction. When the drive shaft of the second motor 72 rotates in the reverse direction, the reverse roller 46 rotates in the reverse paper feeding direction, and the transport roller 91 and the paper discharge roller 92 rotate in the paper feeding direction. The control unit 131 rotates the drive shaft of the first motor 71 and rotates the paper feed roller 41 in the paper feed direction. As a result, the separation function is activated and the paper is read.

  The one-way clutch of the gear 722 of the transmission mechanism 72A transmits the driving force of the second motor 72 to the shaft member 92A when the driving shaft 725 of the second motor 72 rotates in the reverse direction. For this reason, the paper discharge roller 92 rotates counterclockwise, that is, in the paper feed direction. The gear 721 of the transmission mechanism 72A rotates the shaft member 91A counterclockwise when the drive shaft 725 of the second motor 72 rotates in the reverse direction. For this reason, the driving force of the second motor 72 is transmitted to the shaft member 91A, and the transport roller 91 rotates in the paper feeding direction.

  The driving force of the second motor 72 is transmitted to the shaft member 47 via the transmission mechanism 72A, the shaft member 91A, the transmission mechanism 73, and the gears 74A and 74B and the gear 481 of the transmission mechanism 74. The reverse roller 46 rotates in the counter feed direction.

  The control unit 131 rotates the drive shaft of the first motor 71. The transmission mechanism 71 </ b> A transmits the driving force of the first motor 71 to the shaft member 42. As a result, the paper feed roller 41 rotates in the paper feed direction. At this time, the sheet feeding roller 41 contacts the lowermost sheet among the plurality of sheets moving in the sheet feeding direction along the conveyance path 20. Due to the rotation of the paper feed roller 41 and the reverse roller 46, the lowermost sheet is separated from the plurality of sheets and moved in the paper feed direction.

  In the present embodiment, as shown in FIG. 6, the tangent L1 at the contact point P1 between the reverse roller 46 and the paper feed roller 41 is directed in the direction of gravity, and an inclination angle with respect to the front-rear direction is provided in the paper feed tray 16. Since the force in the transport direction due to the weight of the paper loaded on the paper tray 16 increases and the frictional force with the lower layer paper decreases, the lower layer paper is easily separated from the upper layer paper.

  In the present embodiment, the tangent L2 at the contact point P2 between the transport roller 91 and the driven roller 95 is set in the front-rear direction in order to prevent the document discharged outside the reading apparatus 1 from being discharged by the discharge roller 92 and the driven roller 96. The transport path 20 between the transport roller 91 and the paper discharge roller 92 is extended in the front-rear direction. Thus, as shown in FIG. 6, the tangent line L1 and the tangent line L2 intersect each other. Accordingly, the lowermost sheet that has been separated is fed along the tangent line L1 shown in FIG. 6, and the leading end contacts the upper surface 11A. Actually, the locus of the sheet moves away from the tangent L1 toward the upper surface 11A as it moves toward the conveyance roller 91 due to its own weight.

  After the leading edge comes into contact with the upper surface 11A, the sheet moves by the paper feed roller 41 along the upper surface 11A. The leading edge of the sheet passes through the nip point between the conveyance roller 91 and the driven roller 95, that is, the contact point P2, and comes into contact with the first guide surface 932A of the first reading unit 93A. At this time, if the sheet conveyed by the conveying roller 91 is a sheet such as a card having a high rigidity, the sheet having a high rigidity is a tangent L4 between the sheet feeding roller 41 and the conveying roller 91 as shown in FIG. It is arranged along. Even when the paper transported by the transport roller 91 hangs down by its own weight, the first guide surface 932A transports between the first reading surface 931A and the second reading surface 931B as shown in FIG. As it goes to the roller 91, it inclines away from the tangent L2. Since the first guide surface 932A is inclined, the highly rigid sheet disposed along the tangent line L4 shown in FIG. 7 and in contact with the first reading surface 931A is conveyed along the tangent line L2. At this time, a sheet having high rigidity receives a conveying force in the tangential L2 direction by the conveying roller 91 near the leading edge, and receives a conveying force in the tangential L1 direction by the sheet feeding roller 41 near the trailing edge. Bend to become. Since the sheet having high rigidity tends to be deformed so as to be repelled against bending, the driven roller 95 is pushed in a counter biasing direction that is opposite to the biasing direction by the coil spring 95. As a result, the nip force with which the driven roller 95 pinches the conveyance roller 91 is insufficient, and the image read by the image reading unit 93 may be extended or the conveyance may be stopped due to the slip of the conveyance roller 91. In the embodiment, since the auxiliary roller 90 is provided in the reading device 1, the possibility of these problems occurring is reduced. Details will be described below.

  As shown in FIG. 7, the auxiliary roller 90 is in contact with the upper surface of the sheet conveyed along the tangent line L4. For example, the bottom surface 90L on the first housing 11 side of the auxiliary roller 90 is desirably separated from the tangent line L4 in the range of H1. H1 is, for example, 1.4 mm. This is because the thickness of the highly rigid paper including the embossed portion is approximately 1.4 mm. Since the bottom surface 90L disposed in this range receives a force to deform so that a sheet having high rigidity repels bending, the force by which the sheet having high rigidity pushes the driven roller 95 in the counter-biasing direction is reduced. it can.

  When the bottom surface 90L is positioned on the first housing 11 side with respect to the tangent L4, the rigid sheet is bent so as to protrude downward, so that the rigid sheet can be deformed or damaged. There is sex. In the present embodiment, as shown in FIG. 7, the bottom surface 90L of the auxiliary roller 90 on the first housing 11 side is located closer to the second housing 12 than the tangent L4. As a result, the possibility of causing damage such as deformation or breakage to a rigid sheet is reduced.

  A shaft member 90S, which is a rotation shaft of the auxiliary roller 90 shown in FIG. Since the shaft member 90 </ b> S is fixed to the second housing 12, the auxiliary roller 90 is fixed to the second housing 12. In the state shown in FIG. 7, the bottom surface 90 </ b> L receives a force to deform so that a sheet having high rigidity repels bending, and the force by which the sheet having high rigidity pushes the driven roller 95 in the counter-biasing direction is reduced. For this purpose, it is desirable that the biasing force that the auxiliary roller 90 biases in the same direction is larger than the biasing force that the coil spring 951 biases the driven roller 95 in the biasing direction. In the present embodiment, since the shaft member 90S is fixed to the second housing 12, the biasing force of the auxiliary roller 90 can be made larger than the biasing force of the coil spring 951 with a simpler configuration.

  The highly rigid sheet conveyed by the conveyance roller 91 needs to be conveyed between the first guide surface 932A of the first reading unit 93A and the second guide surface 932B of the second reading unit 93B. For this reason, as shown in FIG. 8, the bottom surface 90L of the auxiliary roller 90 on the first housing 11 side is positioned closer to the first housing 11 than the tangent line L3. The tangent line L3 is a tangent line of the paper feed roller 41 passing through the leading end 933B of the second guide surface 932B on the driven roller 95 side. Since the bottom surface 90L is positioned closer to the first housing 11 than the tangent line L3, it is possible to reduce the possibility that a sheet having high rigidity is positioned closer to the second housing 12 than the tangent line L3. In other words, the bottom surface 90L of the auxiliary roller 90 is more than the tangent L3 in a state where the leading edge of the sheet with strong rigidity is sandwiched between the transport roller 91 and the driven roller 95 and the trailing edge is sandwiched between the sheet feeding roller 41 and the reverse roller 46. Since it is located on the first housing 11 side, it comes into contact with a sheet having high rigidity, and receives a force to deform the sheet having high rigidity so as to repel the bending. Therefore, it is possible to reduce the force with which the sheet having high rigidity pushes the driven roller in the counter-biasing direction. As a result, it is possible to reduce the possibility that the read image is extended or the conveyance stops due to the slip of the conveyance roller.

  Note that the rigid paper is, for example, a plastic card, a cash card, a membership card or a license. The length of the short side of this paper is, for example, 53.98 mm of the international standard ID-1 by the International Organization for Standardization (ISO) / International Electrotechnical Commission (IEC). The length of the long side of this paper is, for example, 85.60 mm of international standard ID-1 by the International Organization for Standardization (ISO) / International Electrotechnical Commission (IEC). The thickness of the paper is, for example, 0.76 mm, which is the international standard ID-1 by the International Organization for Standardization (ISO) / International Electrotechnical Commission (IEC).

  The driven roller 95 includes a driven roller 951 and a driven roller 952 (not shown). The driven roller 951 faces the conveying roller 911 shown in FIG. 2, and the driven roller 952 faces the conveying roller 912. As shown in FIG. 9, the auxiliary roller 90 includes an auxiliary roller 901 and an auxiliary roller 902. The auxiliary roller 901 is provided in the second housing 12 on the left side with respect to the center line 11C, and the auxiliary roller 902 is provided in the second housing 12 on the right side with respect to the center line 11C. In FIG. 9, the positions of the paper feed roller 41, the auxiliary roller 90, and the transport roller 91 projected onto the upper surface 12A are shown.

  With reference to FIG. 9, the positional relationship of the paper feed roller 412, the auxiliary roller 902, and the transport roller 912 with respect to the center line 11C will be described. The positional relationship of the paper feed roller 411, the auxiliary roller 901, and the transport roller 911 with respect to the center line 11C is the same as the positional relationship of the paper feed roller 412, the auxiliary roller 902, and the transport roller 912 with respect to the center line 11C. The distance L1 indicates the distance from the left end 412L of the paper feed roller 412 to the center line 11C. The distance L2 indicates the distance from the right end 412R of the paper feed roller 412 to the center line 11C. The distance L3 indicates the distance from the left end 902L of the auxiliary roller 902 to the center line 11C. A distance L4 indicates a distance from the right end 412R of the paper feed roller 412 to the center line 11C. A distance L5 indicates a distance from the left end 912R of the transport roller 912 to the center line 11C. A distance L6 indicates a distance from the right end 912R of the transport roller 912 to the center line 11C. The left ends 412L, 902L, and 912L are inner ends in the left-right direction, and the right ends 412R, 902R, and 912R are outer ends in the left-right direction.

  As shown in FIG. 9, the left end 902 </ b> L of the auxiliary roller 902 is positioned on the right side of the left end 412 </ b> L of the paper feed roller 412. That is, the distance L3 is larger than the distance L1. The right end 902R of the auxiliary roller 902 is located on the right side of the right end 412R of the paper feed roller 412 and is located on the left side of the right end 912R of the transport roller 912. That is, the distance L4 is larger than the distance L2 and smaller than the distance L6. As a result, the highly rigid paper transported along the center line 11C by the paper feed rollers 411 and 412 is in contact with the paper feed roller 412, the auxiliary roller 902, and the transport roller 912 in a balanced manner in the left-right direction. This reduces the possibility that a strong paper will deform in the left-right direction.

  In order to bring the paper into contact with the paper in a more balanced manner in the left-right direction, the left end 902L of the auxiliary roller 902 is preferably positioned on the right side of the center 412C between the left end 412L and the right end 412R of the paper feed roller 412. Further, since the auxiliary roller 902 is brought into contact with the paper of the international standard ID-1, the distance L3 is desirably smaller than 27 mm (≈53.98 mm / 2).

  The conveyance roller 91 contacts the sheet moving in the sheet feeding direction from below and further conveys the sheet in the sheet feeding direction. Images on both sides of the paper are read by an image reading unit 93 (see FIG. 2) arranged in the paper feeding direction of the transport roller 91. The output signal of the image reading unit 93 is transmitted to the control unit 131 and converted into data. The paper discharge roller 92 and the driven roller 96 are in contact with the paper that has passed the image reading unit 93 and further convey the paper in the paper feeding direction. The paper is discharged from the paper discharge port 10B shown in FIG. 1 to the outside of the housing 10 and placed on the paper discharge tray 18.

DESCRIPTION OF SYMBOLS 1 Reading apparatus 10 Housing | casing 11 1st housing | casing 11A Upper surface (conveyance surface)
12 Second housing 12A Lower surface 131 Control unit 20 Transport path 41 Paper feed roller 42 Shaft member 46 Reverse roller 47 Shaft member 90 Auxiliary roller 91 Transport roller 92 Paper discharge roller 93 Image reading unit 931A First reading surface 932A First guide surface 93B Second Reading Unit 931B Second Reading Surface 932B Second Guide Surface 933B Tip 95 Driven Roller 951 Coil Spring

Claims (5)

A first housing having a transfer surface;
A paper feed roller provided in the first housing and disposed to be exposed from the transport surface;
A second housing disposed opposite to the first housing;
A reverse roller provided in the second housing and disposed at a position facing the paper feed roller;
A transport roller provided in the first housing and disposed exposed from the transport surface;
A driven roller that is provided in the second housing and rotates in accordance with the transport roller;
An urging member for urging the driven roller toward the conveying roller;
An auxiliary roller provided in the second housing and disposed between the reverse roller and the driven roller;
A reading unit provided in the second housing, provided on a side opposite to the auxiliary roller with respect to the driven roller, and provided with a reading surface formed of a transparent member;
A guide surface provided in the reading unit and extending from the reading surface toward the driven roller;
With
A first tangent at a contact point between the reverse roller and the paper feed roller intersects a second tangent line at a contact point between the driven roller and the transport roller;
The reading apparatus according to claim 1, wherein a bottom surface of the auxiliary roller on the first housing side is located closer to the first housing than a third tangent of the paper feed roller passing through a tip of the guide surface on the driven roller side. The reading apparatus according to claim 1, wherein the bottom surface of the auxiliary roller is separated within a range of 1.4 mm from a fourth tangent line of the paper feed roller and the transport roller. The reading apparatus according to claim 1, wherein the bottom surface of the auxiliary roller is positioned closer to the second housing than a fourth tangent line between the paper feeding roller and the transport roller. The reading device according to claim 1, wherein the auxiliary roller is fixed to the second housing. In the direction of the rotation axis of the paper feed roller, the inner end of the auxiliary roller is positioned outside the inner end of the paper feed roller, and the outer end of the auxiliary roller is the paper feed roller. 5. The reading device according to claim 1, wherein the reading device is positioned outside an outer end portion of the conveying roller and positioned inside an outer end portion of the transport roller.

Images