JP2007230657A - Document carrying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a document carrying device capable of reducing the size and cost of the device, by easily performing jam processing only by one driving source, without exclusively and separately using a jam processing improving mechanism, and to provide an image reader and an image forming apparatus having the device. <P>SOLUTION: Control is performed for stopping a driving row in a position (a neutral position) for releasing meshing of a planetary gear, when stopping document carrying in the middle by jam processing, by arranging the planetary gear in the driving row for carrying a document. The control is performed for stopping the driving row in a position for releasing sandwiching of a paper ejecting roller, when stopping the document carrying in the middle by the jam processing, by arranging a mechanism capable of selecting sandwiching and releasing of the paper ejecting roller. The control is performed for returning to a sandwiching state in the predetermined timing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a document conveying device, an image reading apparatus including the same, and an image forming apparatus.

  2. Description of the Related Art Conventionally, an image reading apparatus such as a scanner or an image forming apparatus such as a copying machine or a facsimile uses an original conveying apparatus that sends an original through a substantially U-shaped original conveying path. This document conveying device is composed of various rollers involved in document conveyance, a drive source for driving these rollers, a drive transmission unit including gears for transmitting the power of this drive source to each of the rollers, and the like. Yes.

  When a document supplied from the document feed tray and being transported is jammed, for example, in the document transport unit, the outer cover or the like normally provided in the document transport unit is opened to increase the clamping force for the document. The document is removed by releasing it or operating the lever to release the clamping force of the document conveying section.

  However, if a document jams in the document transport device and stops, it is difficult to understand the jam processing method or the jam processing method is complicated. In some cases, the jamming process is performed by forcibly pulling out a visible document, which is different from the method of releasing the clamping force of the part or removing the original jam document. In such a case, since the document is sandwiched between the document conveyance sections, there is a problem that information written on the document is scraped off or the document is damaged.

  Therefore, a method is known in which the latching force is automatically released by operating the latch solenoid during jamming of a document (see Patent Document 1).

There is also known a method of automatically releasing the clamping force in conjunction with opening of a cover that can be opened and closed on the apparatus main body (see Patent Document 2).
Japanese Patent Laid-Open No. 9-30683 JP 2004-136999 A

  However, such a configuration for automatically releasing the clamping force requires a separate part only for releasing the clamping force, leading to an increase in cost and size of the apparatus.

  Therefore, the present invention has been made in view of such a current situation, and it is possible to easily perform jam processing without adding extra parts by using a drive train for conveying a document and An object of the present invention is to provide an original conveying apparatus that can be reduced in size and cost, an image reading apparatus including the same, and an image forming apparatus.

  In order to achieve the above object, the present invention provides a reading unit for reading a document, a document tray on which the document is stacked, and a document stacked on the document tray one by one and feeding the document to the reading unit. Feeding means, paper discharging means for discharging the document in the reading unit, drive transmission means for transmitting drive to the feeding means and the paper discharge means, and release of drive transmission from the drive transmission means In a document conveying apparatus comprising a drive transmission canceling means, and the drive transmission means and one drive source for driving the drive transmission canceling means, the drive transmission canceling means transmits the drive when the drive source is stopped. The holding state and the drive transmission release state are selectively controlled.

  Further, the present invention includes a jam detection unit that detects a jam of a document, and when the occurrence of a jam is detected, the drive source is driven and controlled so that the drive transmission release unit is in a drive transmission release state. It is.

  Further, the present invention includes an input means for an operator operating the document conveying device to input a stop instruction for the drive source, and the drive transmission is transmitted when the stop instruction for the drive source is input by the input means. The drive source is driven and controlled so that the release means is in a drive transmission release state.

  According to the present invention, when the jam detection detection by the jam detection means is canceled, or when the operator inputs a cancellation of the stop instruction of the drive source to the input means, the drive transmission cancellation means transmits the drive transmission. The drive source is controlled to change from the released state to the drive transmission holding state.

  Further, according to the present invention, the drive transmission means has a planetary gear, and the drive transmission release state of the drive transmission release means is that the drive transmission means is stopped at a position where the meshing of the planetary gear is released. It is a feature.

  The present invention also provides a reading unit that reads a document, a document tray on which the document is stacked, a feeding unit that separates the documents stacked on the document tray one by one, and feeds the document to the reading unit; A paper discharge unit that discharges the original in the section, a nipping release unit that holds and releases the nipping of the paper feed unit or the paper discharge unit, the feeding unit, the paper discharge unit, and the nail release unit In a document conveying apparatus having a drive transmission means for transmitting a drive to a drive source and a single drive source for driving the drive transmission means, when the drive source is stopped, the holding and holding state is held by the holding release means. The release state is selectively controlled.

  Further, the present invention is characterized by comprising jam detecting means for detecting a jam of a document, and when the occurrence of the jam is detected, the drive source is driven and controlled so that the clamping release means is in a clamping release state. .

  The present invention also includes an input means for an operator operating the document conveying device to input a stop instruction for the drive source, and the nipping release is performed when the stop instruction for the drive source is input by the input means. The drive source is driven and controlled so that the means is in the nipping release state.

  Further, according to the present invention, when the jam detection detection by the jam detection unit is canceled or when the operator inputs a cancellation instruction for stopping the driving source to the input unit, the clamping release unit is in a clamping release state. The drive source is controlled so as to be in a nipping and holding state.

  Further, the present invention is characterized in that the clamping release means selects a clamping holding state and a clamping release state by a cam mechanism.

  According to the present invention, the feeding unit and the paper discharge unit are driven by the one driving source to read the front side of the document, and then the document is turned upside down and transported to the reading position again, and the back side of the document is scanned. It comprises reading means, the drive transmission releasing means is the drive transmitting means to the feeding means preceding the reading position, and the nipping release means is the paper discharge means.

  By adopting the double-sided reading mechanism to which both of the first and second embodiments are applied, it is possible to carry out without using a dedicated jam processing improvement mechanism separately, so that it can be operated with only one drive source and is inexpensive. It is possible to provide an automatic conveyance reading apparatus having a duplex processing mechanism with good processability.

  In the automatic conveyance reading apparatus described above, the original is replaced with a recording paper, and the original reading apparatus is replaced with a recording apparatus (for example, an ink jet recording apparatus that performs recording by discharging ink). It is possible to provide an inexpensive recording apparatus having a double-sided recording mechanism that transports recording paper with only one drive source and has good jam handling properties.

  Next, details of the present invention will be described in accordance with the description of the embodiments.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings.

  In some cases, the image reading apparatus is provided as a part of the components of the image forming apparatus in the apparatus main body of the image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine of these. In this case, the read information read by the image reading apparatus is formed as an image on a sheet by an image forming unit (image forming unit) of the image forming apparatus. In other words, the image read by the image reading apparatus is copied onto a sheet by the image forming unit.

  In addition, the dimensions, materials, shapes, and relative arrangements of the components described in the following embodiments should be changed as appropriate according to the configuration of the apparatus to which the present invention is applied and various conditions. Unless specifically stated otherwise, the scope of the present invention is not intended to be limited thereto.

[First Embodiment]
A document conveying device according to a first embodiment will be described with reference to the drawings. In this embodiment, an automatic conveyance reading apparatus will be described as an example of an image reading apparatus provided with a document conveyance apparatus to which the present invention is applied.

  FIG. 1 is a perspective view showing an external appearance of an automatic conveyance reading apparatus of the present invention. FIG. 2 is a sectional view showing a schematic configuration of the automatic conveyance reading apparatus of the present invention. FIG. 3 is a partially enlarged sectional view showing a schematic configuration of the automatic conveyance reading apparatus of the present invention. First, the configuration of the automatic conveyance reading apparatus will be described with reference to FIGS.

  The automatic conveyance reading apparatus 1 has a document feed tray 15 at the top. A document discharge tray 16 is provided below the document feed tray 15. Between the document feed tray 15 and the document discharge tray 16, a document feed path 10, a document transport path 11, a document reading path 12, and a document discharge path 13 are sequentially arranged in a substantially U shape. Yes. A document reversing path 14 is provided between the document feeding path 10 and the document reading path 12. The document reversing path 14 connects the document discharge path 13 and the document transport path 11.

  The document feed path 10 includes a separation roller 45a and a pickup roller 47c. A separation pad 48 is in contact with the lower portion of the separation roller 45a by the action of a spring (not shown).

  The document transport path 11 has a transport roller 27a. A transport driven roller 27c abuts on the transport roller 27a by the action of a spring (not shown) so as to freely rotate.

  A document reading platen glass 51 is provided below the document reading path 12, and a document reading device 5 is provided below the document reading platen glass 51. A document pressing member 52 is provided above the document reading platen glass 51. The document is conveyed between the document platen glass 51 and the document pressing member 52. The document reading device 5 irradiates a conveyed document with light from a light source such as a lamp through a reading platen glass 51, reflects the reflected light on a mirror, and photoelectrically converts a document image by a reading unit such as a CCD. read.

  The document discharge path 13 has a discharge roller 33a. A paper discharge driven roller 33c is in contact with the paper discharge roller 33a by the action of a spring (not shown). The paper discharge driven roller 33c is rotatably held by a paper discharge driven roller holder 33d.

  FIG. 4 is a perspective view showing each roller and drive gear train of the automatic conveyance reading apparatus of the present invention. 5 is a schematic diagram showing a gear train during the forward rotation of the motor of the automatic conveyance reading apparatus of the present invention. FIG. 6 is a schematic diagram showing a gear train at the time of reverse rotation of the motor of the automatic conveyance reading apparatus of the present invention. With reference to FIGS. 4 to 6, the configuration of the document conveyance drive train of the present invention will be described.

  The document transport drive train 2 has a motor 17 that can be rotated forward and backward as a single drive source in the document transport drive train 2. A motor gear 18 is attached to the motor 17, and the motor gear 18 meshes with the transport sun gear 21. A transport planetary gear arm 24 that can swing around an axis is attached to the transport sun gear 21. Further, a transport planetary gear A22a and a transport planetary gear B22b are attached to the transport planetary gear arm 24 and mesh with the transport sun gear 21, respectively. As the transport sun gear 21 rotates and the transport planetary gear arm 24 swings, the transport planetary gear A22a meshes with the transport planetary idler gear 23, and the transport planetary gear B22b meshes with the transport idler gear 25. The transport planetary idler gear 23 meshes with the transport idler gear 25. The transport roller 27a is fixed coaxially to the transport roller shaft 27b. A transport roller gear 26 is coaxially supported at the end of the transport roller shaft 27 b, and the transport roller gear 26 meshes with the transport idler gear 25.

  The paper discharge roller 33a is coaxially fixed to the paper discharge roller shaft 33b, and the paper discharge roller gear 32 is coaxially fixed to the end of the paper discharge roller shaft 33b. The paper discharge roller gear 32 meshes with the paper discharge idler gear 31, the paper discharge cam sun gear 34, and the paper supply idler gear 41. A paper discharge cam planetary gear arm 37 is attached to the paper discharge cam sun gear 34 so as to be swingable about the axis. Further, a paper discharge cam planetary gear A35a, a paper discharge cam planetary gear B35b, and a paper discharge cam planetary idler gear 36 are attached to the paper discharge cam planetary gear arm 37. A paper discharge cam planetary gear A35a and a paper discharge cam planetary gear B35b mesh with the paper discharge cam sun gear 34. Further, the paper discharge planetary gear B35b is also meshed with a paper discharge cam planetary idler gear 36. As the discharge cam sun gear 34 rotates and the discharge planetary gear arm 44 swings, the discharge cam planetary gear A 35 a or the discharge cam planetary idler gear 36 meshes with the discharge cam gear 38. A discharge cam shaft 39 b is coaxially fixed to the rotation center of the discharge cam gear 38. A paper discharge cam 39a is coaxially fixed to the end of the paper discharge cam shaft 39b.

  Further, a paper feed sun gear 42 is meshed with the paper discharge roller gear 32 via a triple feed idler gear train 41. A paper feeding planetary gear arm 44 that can swing around an axis is attached to the paper feeding sun gear 42. Further, a paper supply planetary gear A 43 a and a paper supply planetary gear B 43 b are attached to the paper supply planetary gear arm 44 and mesh with the paper supply sun gear 42. Due to the rotation of the paper feed sun gear 42 and the swing of the paper feed planetary gear arm 44, the paper feed planetary gear A43a or the paper feed planetary gear B43b meshes with the separation roller gear A45a. A separation roller shaft 45d is coaxially fixed to the rotation center of the separation roller gear A45a. Further, a separation roller 45c and a separation roller gear B45b are coaxially fixed to the separation roller shaft 45d on the document feeding path 10 side. A pickup gear 47a meshes with the separation roller gear B45b via a pickup idler gear 46. Further, a pickup roller 47c is coaxially fixed to the rotation center of the pickup gear 47a via a pickup shaft 47b. The pickup gear 47a, the pickup shaft 47b, the pickup roller 47c, and the pickup idler gear 46 are integrally supported by a pickup holder 49. A spring clutch (not shown) is attached across the pickup holder 45 and the separation roller shaft 45d.

  FIG. 7 is a perspective view showing a neutral position of the transport planetary gear of the automatic transport reader of the present invention. FIG. 8 is a sectional view showing nipping and releasing nipping of the paper discharge roller of the automatic conveyance reading apparatus of the present invention. FIG. 9 is a perspective view showing a missing tooth of the paper discharge cam gear of the automatic conveyance reading apparatus of the present invention. Next, a series of single-sided document reading operations of the automatic conveyance reading apparatus 1 will be described with reference to FIGS.

  First, the document is loaded on the document feed tray 15. At this time, the reading direction of the original is set upward. The document feed tray 15 or the document feed path 10 has a document presence / absence sensor 54, which detects that a document is loaded on the document feed tray 15.

  When a reading start is input from an operation unit (not shown), the motor 17 and the motor gear 18 start to rotate. The rotation direction at this time is defined as a positive direction. As shown in FIG. 5, the motor gear 18, the transport sun gear 21, the paper discharge idler gear 31, the paper discharge roller gear 32, the paper feed idler gear train 41, the paper feed sun gear 42, the paper feed planetary gear B43b, and the separation roller gear. Drive is transmitted to the separation roller 45c through A45a and the separation roller shaft 45d in this order.

  Further, one end of a pickup holder 49 is attached to the separation roller shaft 45d, and the pickup holder 49 is rotated by the rotation of the separation roller shaft 45d in the positive direction (rotation of the motor 17 in the positive direction), so that the pickup roller 49 is rotated. 47c descends. When the pickup roller 47c comes into contact with the document, the pickup holder 49 is configured to idle with respect to the separation roller shaft 45d by the action of a spring clutch (not shown).

  When the pickup roller 47c comes into contact with the original, one or more upper surfaces of the originals stacked on the original feed tray 15 are sent out. Then, due to the contact between the separation roller 45c and the separation pad 48, when a plurality of documents are conveyed, they are surely separated into one sheet and conveyed from the document feed path 10 to the conveyance roller 27a of the document conveyance path 11. .

  Further, the motor 17 continues to rotate in the positive direction, and is driven to the transport roller 27a through the motor gear 18, transport sun gear 21, transport planetary gear B22b, transport idler gear 25, transport roller gear 26, transport roller shaft 27b in this order. Is conveyed, and the conveying roller 27a continues to rotate in the direction of conveying the document. A transport driven roller 27c is always in contact with the transport roller 27a by the action of a spring (not shown). Therefore, the document conveyed to the document conveyance path 11 is sandwiched between the conveyance roller 27 a and the conveyance driven roller 27 c and further conveyed to the document reading path 12.

  Next, when the leading edge of the document is detected by the document edge sensor 53, reading of image information by the document reading device 5 is started when a predetermined amount is conveyed from that position. At this time, since the original being read is in close contact with the original reading platen glass 51 by the original pressing member 52 and a spring (not shown), the distance between the original reading surface and the original reading device 5 is kept constant by a predetermined amount. It is. Therefore, a clearer image can be read. Thereafter, when the trailing edge of the document being read is detected by the document edge sensor 53, reading of the image information by the document reading device 5 is ended when the document is conveyed by a predetermined amount from that position.

  Further, the motor 17 continues to rotate in the positive direction, and is driven to the discharge roller 33a through the motor gear 18, the transport sun gear 21, the discharge idler gear 31, the discharge roller gear 32, and the discharge roller shaft 33b in this order. Then, the paper discharge roller 33a rotates in a direction to discharge the original to the original discharge tray 16. Since the paper discharge driven roller 33c is always in contact with the paper discharge roller 33a at the time of single-sided reading as shown in FIG. 8A by the action of a spring (not shown) via the paper discharge driven roller holder 33d ( The operation during double-sided reading and the operation of the paper discharge cam will be described later), and the original conveyed to the document discharge path 13 is sandwiched between the paper discharge roller 33a and the paper discharge driven roller 33c to the document discharge tray 16. Be transported. In this way, the automatic conveyance reading apparatus 1 repeats the above-described reading operation until it is detected by the document presence / absence sensor 54 that there is no document loaded on the document feed tray 15.

  Next, a series of double-sided original reading operations of the automatic conveyance reading apparatus 1 will be described with reference to FIGS. First, the front side reading operation at the time of double-sided original reading will be described. It is the same as the one-sided document reading operation described above until the document is stacked on the document feed tray 15, reading is instructed, the document is fed, and the leading edge of the document surface is detected. Therefore, the operation after detecting the leading edge of the document surface will be described below.

  When the leading edge of the document surface is detected by the document edge sensor 53, the motor 17 rotates in a direction opposite to the forward direction by a minute angle. By the rotation in the reverse direction, the paper feeding planetary gear arm 44 rotates by a slight angle in the direction in which the paper feeding planetary gear A43a attempts to mesh with the separation roller gear A45a. Then, by immediately returning the motor 17 to the forward rotation, a wire spring (not shown) is caught on the paper feeding planetary gear arm 44. At this time, the feeding planetary gear arm 44 is in an angular position where neither the feeding planetary gear A43a nor the feeding planetary gear B43b meshes with the separation roller gear A45a. This angular position is called a neutral position. In this neutral position, the drive is not transmitted to the drive train after the separation roller gear A45a, so that the drive of the separation roller 45c and the pickup roller 47c is also stopped. Therefore, even when the second and subsequent documents are stacked on the document feed tray 15, the second and subsequent documents remain on the document feed tray 15 without being conveyed.

  At the same time, when the leading edge of the first document is detected by the document edge sensor 53, reading of image information on the surface of the document by the document reading device 5 is started when a predetermined amount is conveyed from that position. Thereafter, when the trailing edge of the surface of the document being read is detected by the document edge sensor 53, reading of the image information by the document reading device 5 is terminated when the document is conveyed by a predetermined amount from that position.

  Further, after the trailing edge of the document is detected by the document edge sensor 53, it has been conveyed by a predetermined amount (in this case, until the trailing edge of the document surface just passes between the discharge roller 33a and the discharge driven roller 33c). The motor 17 stops once.

  In addition, until now, the motor 17 has been rotated in the positive direction so that the motor gear 18, the transport sun gear 21, the paper discharge idler gear 31, the paper discharge roller gear 32, the paper discharge cam sun gear 34, the paper discharge cam planetary gear B35b, The paper is transmitted to the paper discharge cam 39a through the paper cam planetary idler gear 36, the paper discharge cam gear 38, and the paper discharge cam shaft 39b in this order. Further, as shown in FIG. 9, a part of the discharge cam gear 38 is chipped at a position where the discharge cam planetary idler gear 36 meshes with the discharge cam gear 38. Further, as shown in FIG. 8 (a), the discharge cam 39a and the discharge driven roller holder 33d are separated from each other, and the discharge driven roller 33c and the discharge roller 33a are in contact with each other, and the discharge cam. The missing teeth of the gear 38 are in phase. Accordingly, as in the case of single-sided original reading, as long as the motor 17 continues to rotate forward during double-sided original reading, the discharge driven roller 33c is not shown via the discharge driven roller holder 33d as long as the motor 17 continues to rotate forward. Due to the action of the spring, it always abuts and a clamping force is generated.

  Next, the back side reading operation at the time of double-sided original reading will be described. The contact angle between the paper discharge roller 33a and the paper discharge driven roller 33c is such that the extension of the rear end portion of the nipped document is directed to the document reversing path 14. Accordingly, the motor 17 once stopped can be rotated in the reverse direction, and the rear end portion of the original can be reversely conveyed to the original reverse path 14. Further, since the document reversing path 14 merges with the document transport path 11 before the transport roller 27, if the reverse rotation of the motor 17 is continued, the rear end portion of the document is guided to the transport roller 27. In this way, the reverse side of the original is conveyed to the original reversing path 14 from the rear end of the original, so that the rear side of the original faces the reading platen glass 51 and the original reading device 5 can read the back side of the original.

  Further, by the rotational drive of the motor 17 in the reverse direction, the paper discharge cam sun gear 34 also rotates in the reverse direction, the paper discharge cam planetary gear arm 37 swings, and the paper discharge cam planetary gear A35a becomes the paper discharge cam gear 38. Engage. At this time, as shown in FIG. 9, the discharge cam gear 38 has no missing teeth in the portion that meshes with the discharge cam planetary gear A 35 a, so that the motor 17 is rotated forward by the reverse rotation of the motor 17. The paper discharge cam gear 38, which has been stopped, starts rotating. Therefore, the discharge cam 39a also starts to rotate via the discharge cam shaft 39b. When the paper discharge cam 39a rotates by a predetermined amount as shown in FIG. 8B, the paper discharge driven roller holder 33d is lifted, and the paper discharge driven roller 33c is separated from the paper discharge roller 33a.

  Further, by the rotational drive of the motor 17 in the reverse direction, the transport planetary gear arm 24 also swings, the transport planetary gear A22a meshes with the transport planetary idler gear 23, and the transport idler gear 25, the transport roller gear 26, and the transport roller 27a. Drive is transmitted to. Although the motor 17 rotates in the reverse direction, since the drive transmission to the transport roller 27a is via the transport planetary idler gear 23, the rotation direction of the transport roller 27a is the same as when the motor 17 rotates in the forward direction. become. When the document conveyed through the document reversing path 14 by the paper discharge roller 33a is nipped and conveyed by the conveying roller 27 and the trailing edge of the document is detected by the document edge sensor 53, the document reversing path 14 can be conveyed without jamming. At this time, the motor 17 returns to the forward rotation.

  Thereafter, when the leading edge of the back side of the document (the trailing edge of the document surface) is detected by the document edge sensor 53, the image information on the back surface of the document by the document reading device 5 is transported by a predetermined amount from that position. Reading is started.

  In the present invention, in order to reduce the size of the apparatus as much as possible, the paper path length including the document reversing path 14, the document transport path 11, the document reading path 12, and the document discharge path 13 is made as short as possible. Therefore, when the leading end of the back side of the document reaches the discharge roller 33a while reading the back side of the double-sided document, the trailing end of the back side of the document is still closer to the document discharge tray 16 than the discharge roller 33a. That is, the leading edge and the trailing edge of the same document pass through a substantially U-shaped paper path. However, as described above, since the paper discharge driven roller 33c is separated from the paper discharge roller 33a at this time, the original can be passed between the leading edge and the trailing edge when reading the back side of the original without jamming.

  Then, before the trailing edge of the back side of the document passes through the paper discharge roller 33a and reaches the conveyance roller 27a, the paper discharge cam 39a rotates by a predetermined amount, and the paper discharge driven roller 33c comes into contact with the paper discharge roller 33a again. Then, the document is conveyed by nipping the conveyance roller 33a and the discharge roller 33a. Thereafter, when the trailing edge of the back side of the document being read is detected by the document edge sensor 53, the reading of the image information on the back side by the document reading device 5 is terminated when the document edge sensor 53 is transported by a predetermined amount. Then, it is conveyed to the document discharge tray 16. The above-described reading operation is repeated until it is detected by the document presence / absence sensor 54 that there are no more documents loaded on the document feed tray 15.

  Further, if a plurality of documents are discharged to the document discharge tray 16 in this state, the page order is originally different from that of the document feed tray 15 (the front and back sides are reversed). The document reversing path 14 may be transported again without any operation, and the page order may be aligned.

  Next, midway stop control during document conveyance will be described.

  In the automatic conveyance reading apparatus 1 of the present invention, it is necessary to stop conveyance halfway during document conveyance (including during document reading) when a jam of a document being conveyed is detected or when the automatic conveyance reading apparatus 1 is used. There is a case where the user intentionally stops the conveyance on the way by an operation on an operation panel (not shown). In the automatic conveyance reading apparatus 1 of the present embodiment, when the conveyance of the document is stopped halfway, when the motor 17 rotates in the forward direction, it is stopped after rotating in the reverse direction by a small angle. The minute amount at this time is an angle at which the carrier planetary gear B22b is separated from the carrier idler gear 25 engaged with the swinging of the carrier planetary gear arm 24 and the carrier planetary gear A22a does not mesh with the carrier planetary idler gear 23. The amount of position (neutral position). Similarly, when the motor 17 is rotating in the reverse direction, it is stopped after rotating in the forward direction by a small amount. At this time, an angular position (the transport planetary gear A22a is separated from the transport planetary idler gear 23 and the transport planetary gear B22b is not meshed with the transport idler gear 25 by the swinging of the transport planetary gear arm 24). Neutral position).

  As described above, when the document conveyance is stopped halfway, the drive transmission between the conveyance roller 27a and the motor 17 is cut off by stopping the driving at the position where the conveyance planetary gear arm 24 is in the neutral position. Even if the nipping of the transport driven roller 27c is not released, the transport roller 27a can be driven and rotated with a relatively easy force to pull out the document, and even when jamming is performed by forcibly pulling out the document. Can be prevented from being scraped off or the original being damaged.

[Second Embodiment]
Next, a document conveying apparatus according to the second embodiment will be described. Note that the configurations of the automatic conveyance reading device and the document conveyance drive train, the single-sided document reading operation and the double-sided document reading operation are the same as those in the second embodiment, and will be omitted. Only the halfway stop control during document conveyance will be described.

  In the automatic conveyance reading apparatus 1 of the present invention, it is necessary to stop conveyance halfway during document conveyance (including during document reading) when a jam of a document being conveyed is detected or when the automatic conveyance reading apparatus 1 is used. There is a case where the user intentionally stops the conveyance on the way by an operation on an operation panel (not shown). When the conveyance of the original is stopped halfway, the automatic conveyance reading apparatus 1 according to the present embodiment stops in a state where the nipping between the discharge roller 33a and the discharge driven roller 33c is released as shown in FIG. . In this way, even if the conveyance of the original is stopped halfway and the original remains in the vicinity of the paper discharge roller 33a, the original can be pulled out relatively easily, and information recorded on the original by the original removal operation can be obtained. It can be prevented from being scraped off or being damaged.

  The paper discharge driven roller 33c is pressed against the paper discharge roller 33a by the action of a spring (not shown) via the paper discharge driven roller holder 33d, but the nipping between the paper discharge roller 33a and the paper discharge driven roller 33c is released. In the state, the load due to this spring action increases. Therefore, the automatic conveyance reading apparatus 1 of the present embodiment stops the conveyance of the document halfway and stops in a state where the nipping between the discharge roller 33a and the discharge driven roller 33c is released, and the discharge roller at a predetermined timing. 33a and the paper discharge driven roller 33c are returned to the clamping state. Thereby, it is possible to return the load by the spring action of clamping to normal time. The predetermined timing at this time is, for example, when a person using the automatic conveyance reading device 1 inputs that the jam processing is completed by operating an operation panel (not shown), or when the nipping is released. For example, when a predetermined time has elapsed since the start.

  As described above in detail, when the document conveyance is stopped halfway, the conveyance roller can be easily driven and rotated by stopping the driving at a position (neutral position) where the planetary gear in the document conveyance drive train is not meshed. Thus, even when the jam processing is performed by forcibly pulling out the original, it is possible to prevent the information written on the original from being scraped off or damaged.

  In addition, by stopping the driving with the paper ejection roller being released, the document can be pulled out relatively easily, and information written on the document is scraped off by the document removal operation, or the document Can be prevented from being damaged.

  Furthermore, after the drive is stopped in the state where nipping of the paper discharge roller is released, the paper discharge roller is returned to the nipping state at a predetermined timing, so that the load caused by the nipping spring action can be returned to the normal time. .

The perspective view which shows the external appearance of the automatic conveyance reading apparatus of this invention Sectional drawing which shows schematic structure of the automatic conveyance reading apparatus of this invention Partial expanded sectional view which shows schematic structure of the automatic conveyance reading apparatus of this invention The perspective view which shows each roller and drive gear train of the automatic conveyance reading apparatus of this invention The schematic diagram which shows the gear train at the time of the motor forward rotation of the automatic conveyance reading apparatus of this invention The schematic diagram which shows the gear train at the time of motor reverse rotation of the automatic conveyance reading apparatus of this invention The perspective view which shows the neutral position of the conveyance planetary gear of the automatic conveyance reading apparatus of this invention Sectional drawing which shows clamping of the paper discharge roller of the automatic conveyance reading apparatus of this invention, and cancellation | release of clamping The perspective view which shows the missing tooth of the discharge cam gear of the automatic conveyance reading apparatus of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic conveyance reading apparatus 11 Original conveyance path 14 Original reversal path 17 Motor 2 Original conveyance drive train 21 Conveyance sun gear 22a Conveyance planetary gear A
22b Conveying planetary gear B
24 Conveying planetary gear arm 27a Conveying roller 27c Conveying driven roller 33a Discharging roller 33c Discharging driven roller 33d Discharging driven roller holder 39a Discharging cam 45c Separating roller 47c Pickup roller 5 Document reading device

Claims (11)

Reading means for reading a document, a document tray on which the document is stacked, a feeding means for separating the documents stacked on the document tray one by one and feeding them to the reading unit, and a document in the reading unit A paper discharge means for discharging paper, a drive transmission means for transmitting drive to the paper feed means and the paper discharge means, a drive transmission release means for releasing the drive transmission of the drive transmission means, the drive transmission means and the drive In a document conveying device provided with one drive source for driving the transmission release means,
An original conveying apparatus that selectively controls a drive transmission holding state and a drive transmission release state by the drive transmission release means when the drive source is stopped.   2. The drive source according to claim 1, further comprising a jam detection unit configured to detect a jam of an original, wherein when the occurrence of the jam is detected, the drive source is driven and controlled so that the drive transmission release unit is in a drive transmission release state. Document transport device.   An operator operating the document feeder includes input means for inputting a stop instruction for the drive source. When the stop instruction for the drive source is input by the input means, the drive transmission canceling means transmits the drive transmission. The document conveying apparatus according to claim 1, wherein the driving source is controlled to be in a released state.   When the jam detection detection by the jam detection means is canceled or when the operator inputs a cancellation instruction for stopping the drive source to the input means, the drive transmission release means is driven from the drive transmission release state. 4. The document conveying device according to claim 1, wherein the driving source is controlled so as to be in a holding state.   The drive transmission means has a planetary gear, and the drive transmission release state of the drive transmission release means is that the drive transmission means is stopped at a position where the meshing of the planetary gear is released. The document conveying device according to claim 1. Reading means for reading a document, a document tray on which the document is stacked, a feeding means for separating the documents stacked on the document tray one by one and feeding them to the reading unit, and a document in the reading unit Drive is transmitted to the paper discharge means for discharging paper, the paper feed means or the grip release means for holding and releasing the document pinching of the paper discharge means, and the feed means, the paper discharge means, and the pinch release means. In a document conveying device comprising a drive transmission means and one drive source for driving the drive transmission means,
An original conveying apparatus, wherein the nipping and holding state is selectively controlled by the nipping and releasing means when the driving source is stopped.   7. The document conveyance according to claim 6, further comprising a jam detection unit that detects a jam of the document, and when the occurrence of the jam is detected, the drive source is driven and controlled so that the clamping release unit is in a clamping release state. apparatus.   An operator operating the document conveying device includes input means for inputting a stop instruction for the drive source. When the stop instruction for the drive source is input by the input means, the clamp release means is in a clamp release state. The document feeder according to claim 6, wherein the driving source is controlled to be   When the jam detection detection by the jam detection means is released or when the operator inputs a release instruction to stop the driving source to the input means, the clamping release means changes from the clamping release state to the clamping holding state. 9. The document conveying device according to claim 6, wherein the driving source is controlled to be   The document conveyance device according to any one of claims 6 to 9, wherein the nipping release means selects a nipping holding state and a nipping release state by a cam mechanism. 11. The document conveying device according to claim 1, wherein after the surface of the document is read by driving the feeding unit and the sheet discharging unit with the one driving source, the document is turned upside down. A means for reversing and transporting it to the reading position again to read the back side of the document,
An original conveying apparatus, wherein the drive transmission releasing means is the drive transmitting means to the feeding means at the preceding stage of the reading position, and the nipping release means is the paper discharge means.

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