JP2020050507A - Conveying device and image recording device - Google Patents

Abstract

To provide a conveying device capable of preventing a deviation of a sheet conveyance amount caused by a phase difference in a one-way clutch.SOLUTION: A multifunction machine 10 comprises: a pair of conveying roller 54 having a conveying roller 60 which is rotated so as to convey a sheet 12 in the conveying direction 16 when normal rotation of a conveying motor 102 is transmitted, and is rotated in an opposite direction when reverse rotation is transmitted; a pair of discharge rollers 55 having a discharge roller 62 located downstream of the conveying roller 60 in the conveying direction 16; and a transmission part 74. The transmission part 74 comprises: a pulley 78 having a one-way clutch 83 which transmits the normal rotation of the conveying motor 102 to the discharge roller 62 but does not transmit the reverse rotation to the discharge roller 62; and a projection 117 and a recess 118 for idling the discharge roller 62 by a predetermined amount with reference to the pulley 78. The predetermined amount is larger than the rotation amount of the discharge roller 62 which is rotated by the force acting from the sheet 12 when the sheet 12 held by both of the conveying roller 54 and the pair of discharge rollers 55 is conveyed and passes through the pair of conveying rollers 54.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a conveyance device that conveys a sheet along a conveyance path, and an image recording device including the conveyance device and capable of recording an image on a sheet.

  A transport device that transports a sheet along a transport path is known. As an apparatus including a transport device, for example, an image recording apparatus that records an image on a sheet can be given. In the transport path of the transport device, a plurality of rollers for transporting the sheet are arranged at intervals.

  In view of recent demands for downsizing and cost reduction of the transfer device, it is preferable that the number of motors mounted on the transfer device is small. Therefore, it is preferable that the plurality of rollers be driven by a common motor, as in the transport devices disclosed in Patent Documents 1 and 2.

  The conveying devices disclosed in Patent Documents 1 and 2 are configured such that a first roller pair having a first roller transmitted from a motor is located downstream of the first roller pair in the sheet conveying direction. A second roller pair having a second roller to which drive is transmitted from the roller via a belt or the like. Further, the transport device includes a one-way clutch in a drive transmission path from the first roller to the second roller. Thus, the forward rotation of the motor is transmitted from the first roller to the second roller, but the reverse rotation of the motor is not transmitted from the first roller to the second roller. As a result, in a state where the preceding sheet is sandwiched between the second roller pair, when the motor is rotated in reverse to correct the skew of the subsequent sheet by the first roller pair, or to drive another roller, It is possible to prevent the preceding sheet from being fed back.

JP 2013-203503 A JP 2017-65892A

  However, in the case of the transfer devices disclosed in Patent Literatures 1 and 2, the following problems may occur. When the sheet is conveyed in the conveying direction in a state where the sheet is sandwiched by both the first roller pair and the second roller pair, the sheet is conveyed in the conveying direction. A momentary acting force in the transport direction acts on the second roller from the sheet. Thereby, the rotation amount of the second roller instantaneously becomes larger than the rotation amount of the first roller. Then, the inner ring of the one-way clutch rotates integrally with the shaft of the second roller, and the one-way clutch is in a state in which the drive transmission from the first roller to the second roller is released. Thereafter, the forward rotation of the motor is transmitted from the first roller to the outer wheel of the one-way clutch, and the outer wheel rotates, whereby the one-way clutch returns to a state in which the drive can be transmitted from the first roller to the second roller.

  However, during the rotation of the outer wheel, the inner wheel does not rotate until the one-way clutch returns to a state where the drive can be transmitted from the first roller to the second roller. As a result, a phase difference occurs between the inner wheel and the outer wheel of the one-way clutch. As a result, in the subsequent sheet conveyance, a deviation occurs between the sheet conveyance amount obtained from the rotation amount of the motor calculated by the rotary encoder and the like and the actual sheet conveyance amount.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transport device that can prevent a deviation in a transport amount of a sheet due to a phase difference in a one-way clutch.

  (1) A transport device of the present invention is a motor that rotates forward and reverse, and is located in a sheet transport path, and transports a sheet in a transport direction by transmitting one of forward rotation and reverse rotation of the motor. A first roller pair having a first roller that rotates in a direction and rotates in a direction that conveys the sheet in a direction opposite to the conveyance direction by transmitting the other of the forward rotation and the reverse rotation of the motor; A second roller pair having a second roller located downstream of the first roller in the transport direction, and a first transmission unit capable of transmitting rotation of the motor from the first roller to the second roller. Prepare. A rotating body having a one-way clutch that transmits one of forward rotation or reverse rotation of the motor to the second roller and does not transmit the other of forward rotation or reverse rotation of the motor to the second roller; The second roller, which is provided between the rotator and the second roller in the transmission path of the rotation of the motor and rotates in a direction in which the sheet is transported in the transport direction, is moved by a predetermined amount with respect to the rotator. And an idler for idling. The predetermined amount is rotated by a force applied from the sheet when the sheet sandwiched by both the first roller pair and the second roller pair is conveyed in the conveyance direction and passes through the first roller pair. Is larger than the rotation amount of the second roller.

  When the sheet is conveyed in a state where the sheet is sandwiched by both the first roller pair and the second roller pair, when the upstream end in the conveyance direction of the sheet comes off from the first roller pair, the sheet is instantaneously applied to the sheet. The acting conveying direction force acts on the second roller from the sheet. This force causes the second roller to rotate instantaneously. Here, the predetermined amount by which the idler can idle the second roller with respect to the rotating body is larger than the amount of rotation by the instantaneous rotation of the second roller. Therefore, the second roller idles with respect to the rotating body. Therefore, since the inner ring of the one-way clutch does not rotate, the one-way clutch is maintained in a state in which the drive can be transmitted from the first roller to the second roller. That is, there is no phase difference between the inner wheel and the outer wheel of the one-way clutch. Thereafter, when the forward rotation of the motor is transmitted from the first roller to the outer wheel of the one-way clutch and the outer wheel rotates, the inner wheel and the second roller of the one-way clutch also rotate.

  According to the present invention, since a phase difference does not occur in the one-way clutch, it is possible to prevent a shift in the sheet conveyance amount due to the occurrence of the phase difference.

FIG. 1 is a perspective view of the multifunction peripheral 10. FIG. 2 is a longitudinal sectional view schematically showing the internal structure of the printer unit 11. FIG. 3 is a plan view of the carriage 23 and the guide rails 43 and 44. 4A and 4B are schematic diagrams of the transmission unit 74 and the transmission unit 85, wherein FIG. 4A illustrates a state in which the transport motor 102 is rotated forward, and FIG. 4B illustrates a state in which the transport motor 102 is rotated reversely. FIG. 5 is a plan view of the drive transmission mechanism 70 and each of the rollers 60 and 62. FIG. 6 is a block diagram of the printer unit 11. FIG. 7 is a schematic cross-sectional view of the periphery of the pulley 78 in a state where the roller 113 is sandwiched between the first surface 115 and the outer peripheral surface 112A. FIG. 8 is a schematic cross-sectional view of the periphery of the pulley 78 in a state where the roller 113 is sandwiched between the second surface 116 and the outer peripheral surface 112A. FIG. 9 is a schematic cross-sectional view of the periphery of the pulley 78 in a state where the protrusion 117 is separated from the side surface 118B. FIG. 10 is a flowchart of the image recording process. FIG. 11 is a longitudinal sectional view schematically showing the internal structure of the printer unit 11 in a state where the preceding sheet 12A is at a predetermined position. FIG. 12 is a schematic cross-sectional view of a pulley 78 having three protrusions 117 and the periphery thereof.

  Hereinafter, embodiments of the present invention will be described. The embodiment described below is merely an example of the present invention, and it goes without saying that the embodiment of the present invention can be appropriately changed without changing the gist of the present invention. In the following description, the vertical direction 7 is defined based on the state in which the multifunction peripheral 10 is installed so as to be usable (the state in FIG. 1), and the front and rear directions 8 are defined as the front surface 104 where the opening 13 is provided. The left-right direction 9 is defined when the MFP 10 is viewed from the front to the rear. The up-down direction 7, the front-back direction 8, and the left-right direction 9 are orthogonal to each other. In the present embodiment, the vertical direction 7 corresponds to the vertical direction, and the front-back direction 8 and the left-right direction 9 correspond to the horizontal direction.

[Overall Configuration of MFP 10]
As shown in FIG. 1, the multifunction peripheral 10 (an example of an image recording apparatus) is formed in a substantially rectangular parallelepiped. The multifunction device 10 has a printer unit 11 that records an image on a sheet 12 (an example of a sheet, see FIG. 2) by an ink jet recording method at a lower portion. The multifunction peripheral 10 has various functions such as a facsimile function and a print function. Note that the printer unit 11 may record an image on the paper 12 using, for example, an electrophotographic method other than the ink jet recording method.

  As shown in FIG. 2, the printer unit 11 includes a transport device, a recording unit 24, and a platen 42. The transport device includes a feed unit 15, a feed tray 20 (an example of a tray), a discharge tray 21, a transport roller pair 54 (an example of a first roller pair), and a discharge roller pair 55 (a second roller pair). An example), a transport motor 102 (an example of a motor, see FIG. 6), and a drive transmission mechanism 70 (see FIG. 6).

[Feeding tray 20, discharging tray 21]
As shown in FIGS. 1 and 2, the feeding tray 20 is inserted rearward through an opening 13 formed in the front of the printer unit 11 and is pulled out frontward. The feed tray 20 supports a plurality of stacked sheets 12. The discharge tray 21 is located above the feed tray 20. The discharge tray 21 supports the sheet 12 discharged by the discharge roller pair 55 through the opening 13.

[Feeding unit 15]
As shown in FIG. 2, the feeding section 15 includes a feeding roller 25, a feeding arm 26, and a shaft 27. The feed roller 25 is rotatably supported at the tip of the feed arm 26. The feed roller 25 rotates the feed motor 102 (see FIG. 6) in a direction to feed the paper 12 supported on the feed tray 20 backward by the reverse rotation of the feed motor 102 (see FIG. 6), thereby feeding the paper 12 to a feed path 65 described later. Send. The paper 12 fed to the transport path 65 is transported along the transport path 65 in the transport direction 16. The transport direction 16 is a direction along the transport path 65 and is indicated by an alternate long and short dash line arrow in FIG. The paper 12 transported in the transport direction 16 by the feed tray 20 is directed to a transport roller pair 54 located in the transport path 65. The feeding arm 26 is rotatably supported by a shaft 27 supported by a frame of the printer unit 11.

[Transport path 65]
As shown in FIG. 2, a transport path 65 through which the paper 12 passes is formed inside the printer unit 11. The transport path 65 refers to a space formed by the guide members 18 and 19 facing each other at a predetermined interval inside the printer unit 11 and a space formed by the recording unit 24 and the platen 42.

  The transport path 65 includes a curved transport path and a linear transport path that extends linearly. The curved conveyance path is a path that makes a U-turn while extending upward from below at the rear of the printer unit 11. The straight conveyance path is a path from the conveyance roller pair 54 to the discharge tray 21 via the recording unit 24. Further, the pair of transport rollers 54 and the pair of discharge rollers 55 according to the present embodiment are located on a straight transport path of the transport path 65.

  Note that the transport path 65 is not limited to the configuration including the curved transport path and the linear transport path as shown in FIG. For example, the transport path 65 may be constituted only by a straight transport path.

[Conveying roller pair 54 and discharge roller pair 55]
As shown in FIG. 2, the transport roller pair 54 is located on a straight transport path of the transport path 65. The transport roller pair 54 includes a transport roller 60 (an example of a first roller) and a pinch roller 61 facing each other. The transport roller 60 is driven by a transport motor 102 (see FIG. 6). The pinch roller 61 rotates with the rotation of the transport roller 60.

  The discharge roller pair 55 is located downstream of the transport roller pair 54 in the transport direction 16 in the transport path 65. The discharge roller pair 55 includes a discharge roller 62 (an example of a second roller) and a spur 63 facing each other. The discharge roller 62 is driven by the transport motor 102 (see FIG. 6). The spur 63 rotates with the rotation of the discharge roller 62.

  In addition, as described later, the transport roller 60 and the discharge roller 62 have a direction in which the paper 12 is transported in the transport direction 16 and a direction opposite to the direction (in other words, a direction in which the paper 12 is transported in a direction opposite to the transport direction 16). ). In the following description, among the rotations of the transport roller 60 and the discharge roller 62, the rotation in the direction of transporting the paper 12 in the transport direction 16 is referred to as normal rotation. Further, among the rotations of the transport roller 60 and the discharge roller 62, a rotation in a direction opposite to the normal rotation is described as a reverse rotation.

[Recording unit 24]
As shown in FIG. 2, the recording unit 24 is located on a straight conveyance path of the conveyance path 65. In the present embodiment, the recording unit 24 is located between the pair of transport rollers 54 and the pair of discharge rollers 55 in the linear transport path.

  The recording unit 24 is provided above the platen 42 so as to face the platen 42. The platen 42 supports the sheet 12 transported by the transport roller pair 54 from below. The recording unit 24 includes a carriage 23 and a recording head 39.

  As shown in FIG. 3, from the carriage 23, an ink tube 32 and a flexible flat cable 33 extend. The ink tube 32 supplies the ink in the ink cartridge to the recording head 39. The flexible flat cable 33 electrically connects the control board on which the controller 130 (see FIG. 6) is mounted and the recording head 39.

  The carriage 23 is supported by guide rails 43 and 44. The guide rails 43 and 44 are spaced apart along the front-back direction 8. The guide rails 43 and 44 extend in the left-right direction 9. The carriage 23 is connected to a known belt mechanism provided on a guide rail 44. The belt mechanism makes a peripheral movement by driving a carriage motor 103 (see FIG. 6). The carriage 23 moves in the left-right direction 9 by the circumferential movement of the belt mechanism.

  As shown in FIG. 2, the recording head 39 is mounted on the carriage 23. A plurality of nozzles 40 are formed on the lower surface of the recording head 39. The recording head 39 discharges ink from the nozzles 40 as minute ink droplets. In the process of moving the carriage 23, the recording head 39 ejects ink droplets to the paper 12 supported by the platen 42. Thereby, an image is recorded on the paper 12.

[Sensor 120]
As illustrated in FIG. 2, the sensor 120 is located on the transport path 65 upstream of the transport roller pair 54 in the transport direction 16. The sensor 120 is a sensor for detecting the presence of the sheet 12 at the position where the sensor 120 is disposed. The sheet 12 conveyed by the feeding unit 15 passes through the position where the sensor 120 is disposed and reaches the pair of conveying rollers 54. The sensor 120 outputs one of a high-level signal and a low-level signal (low-level signal in the present embodiment) to the controller 130 (see FIG. 6) in accordance with the presence of the sheet 12 at the placement position. On the other hand, the sensor 120 outputs the other of the high-level signal and the low-level signal (high-level signal in the present embodiment) to the controller 130 in response to the sheet 12 not being present at the arrangement position.

[Rotary encoder 121]
As shown in FIG. 2, the printer unit 11 includes a known rotary encoder 121 that generates a pulse signal in accordance with the rotation of the transport roller 60. The rotary encoder 121 includes an encoder disk 123 and an optical sensor 124. The encoder disk 123 rotates with the rotation of the transport roller 60. The optical sensor 124 reads the rotating encoder disk 123 to generate a pulse signal, and outputs the generated pulse signal to the controller 130. Note that the rotary encoder 121 may generate a pulse signal in accordance with the rotation of the transport motor 102. In this case, the encoder disk 123 is attached to the shaft of the transport motor 102.

[Drive transmission mechanism 70]
As shown in FIG. 6, the drive transmission mechanism 70 transmits the rotation of the single transport motor 102 to the feed roller 25, the transport roller 60, and the discharge roller 62. The drive transmission mechanism 70 is configured by combining all or a part of a gear, a pulley, an endless annular belt, a planetary gear mechanism, and the like.

  As shown in FIGS. 4 and 5, the drive transmission mechanism 70 includes a pulley 71 that rotates integrally with the shaft of the transport motor 102, a pulley 72 that rotates integrally with the shaft 60 </ b> A of the transport roller 60, and windings around the pulleys 71 and 72. And an endless annular belt 73 that is bridged. Accordingly, the transport roller 60 rotates forward by transmitting the forward rotation of the transport motor 102, and reversely transmits the reverse rotation of the transport motor 102 by transmitting the reverse rotation. The transport roller 60 transports the paper 12 sandwiched between the transport roller 60 and the pinch roller 61 in the transport direction 16 by rotating forward.

  As shown in FIG. 5, the drive transmission mechanism 70 includes transmission units 74 and 85 that transmit the rotation of the transport motor 102 to the feed roller 25 and the discharge roller 62 via the shaft 60A of the transport roller 60. However, a specific configuration for transmitting the rotation of the transport motor 102 to the feed roller 25, the transport roller 60, and the discharge roller 62 is not limited to the following example. The transmission unit 74 is an example of a first transmission unit. The transmission unit 85 is an example of a second transmission unit.

[Transmission unit 74]
4 and 5 transmits the forward rotation of the transport motor 102 from the transport roller 60 to the discharge roller 62. As shown in FIG. 5, the transmission unit 74 is provided on the left side of the transport path 65. That is, the transmission unit 74 transmits the rotation from the left portion of the discharge roller 62 to the discharge roller 62. Note that the position of the transmission unit 74 is not limited to the position shown in FIG. For example, the transmission unit 74 may be provided on the right side of the transport path 65.

  As shown in FIGS. 4 and 5, the transmission section 74 is configured by gears 75 and 76 meshing with each other, pulleys 77 and 78, and an endless annular belt 81.

  The gear 75 meshes with the gear 76 and rotates integrally with the shaft 60A of the transport roller 60. The gear 76 and the pulley 77 rotate coaxially and integrally.

  The pulley 78 (an example of a rotating body) is attached to the outside of the shaft 62 </ b> A of the discharge roller 62. Pulley 78 is rotatable about axis 62A. The rotation of the pulley 78 allows the discharge roller 62 to rotate in conjunction therewith. The pulley 78 includes a one-way clutch 83. The one-way clutch 83 rotates the discharge roller 62 integrally with the pulley 78 when the forward rotation of the transport motor 102 is transmitted. That is, the one-way clutch 83 transmits the forward rotation of the transport motor 102 transmitted to the pulley 78 to the shaft 62A of the discharge roller 62. On the other hand, the one-way clutch 83 causes the pulley 78 to idle with respect to the discharge roller 62 when the reverse rotation of the transport motor 102 is transmitted. That is, the one-way clutch 83 does not transmit the reverse rotation of the transport motor 102 transmitted to the pulley 78 to the shaft 62 </ b> A of the discharge roller 62. The detailed configuration of the pulley 78 will be described later.

  The belt 81 is wound around pulleys 77 and 78.

  As shown in FIG. 4A, the transmission unit 74 transmits the forward rotation of the transport motor 102 from the transport roller 60 to the discharge roller 62, and rotates the discharge roller 62 forward. The fact that the discharge roller 62 is rotating forward is indicated by an arrow described outside the discharge roller 62. On the other hand, as shown in FIG. 4B, the transmission unit 74 does not transmit the reverse rotation of the transport motor 102 from the transport roller 60 to the discharge roller 62.

  As described above, when the forward rotation of the transport motor 102 is transmitted through the transmission unit 74, the discharge roller 62 rotates in the direction of transporting the sheet 12 sandwiched between the spur 63 and the transport direction 16 in the transport direction 16. Thus, the paper 12 is discharged to the discharge tray 21.

[Transmission unit 85]
The transmission unit 85 shown in FIG. 4 transmits the rotation of the transport motor 102 transmitted via the shaft 60 </ b> A of the transport roller 60 to the feed roller 25. As shown in FIG. 4, the transmission unit 85 includes gears 84, 86 to 91, pulleys 93 to 95, endless annular belts 96, 97, a sun gear 98, a planetary gear 99, and an arm 100. It is configured.

  The gear 84 rotates integrally with the shaft 60A. The gear 86 meshes with the gear 84. Gear 87 meshes with gear 86. The gear 87 and the pulley 92 rotate coaxially and integrally. The gear 88 and the pulley 93 rotate coaxially and integrally. The gear 89 meshes with the gear 88. The sun gear 98 rotates coaxially with the gear 89. The planet gear 99 meshes with the sun gear 98 and moves toward and away from the gear 90. One end of the arm 100 is rotatably supported by the sun gear 98, and the other end supports the planetary gear 99 so as to be able to rotate and revolve around the sun gear 98. Thereby, the planetary gear 99 revolves around the sun gear 98 while rotating by rotation of the sun gear 98. The gear 90 meshes with the gear 91. The gear 91 and the pulley 94 rotate coaxially and integrally. The pulley 95 rotates coaxially and integrally with the feed roller 25. The belt 96 is wound around pulleys 92 and 93. The belt 97 is wound around pulleys 94 and 95.

  As shown in FIG. 4A, the planetary gear 99 is separated from the gear 90 by the forward rotation of the transport motor 102 being transmitted to the sun gear 98. As a result, the transmission unit 85 does not transmit the forward rotation of the transport motor 102 to the feed roller 25. On the other hand, as shown in FIG. 4B, the planetary gear 99 meshes with the gear 90 by transmitting the reverse rotation of the transport motor 102 to the sun gear 98. As a result, the transmission unit 85 transmits the reverse rotation of the transport motor 102 to the feed roller 25. As a result, the feed roller 25 rotates.

[Pulley 78]
As shown in FIG. 7, the pulley 78 includes a one-way clutch 83. The one-way clutch 83 includes an outer ring 111, an inner ring 112, and a roller 113.

  The outer ring 111 has a cylindrical shape. A belt 81 is wound around the outer peripheral surface 111 </ b> A of the outer race 111. The inner ring 112 is arranged inside the outer ring 111. The outer ring 111 and the inner ring 112 are rotatable around the axis 62A, that is, rotatable in the circumferential direction 107. A gap 110 is formed between the inner ring 112 and the outer ring 111. The rollers 113 are arranged in the gap 110.

  The inner peripheral surface of the outer ring 111 includes a plurality of protrusions 114, a first surface 115, and a second surface 116.

  The plurality of protrusions 114 are provided at intervals along the circumferential direction 107 of the pulley 78. In the present embodiment, six protrusions 114 are provided, but the number of protrusions 114 is not limited to six. Further, the interval between two adjacent protrusions 114 may be equal or different. The protrusion 114 protrudes inward in the radial direction of the pulley 78, that is, toward the inner ring 112 located on the rotation center side of the pulley 78.

  The first surface 115 and the second surface 116 are located between two adjacent protrusions 114 in the circumferential direction 107.

  The first surface 115 extends from the protrusion 114 in one direction in the circumferential direction 107 (clockwise in FIG. 7). The first surface 115 is inclined with respect to the circumferential direction 107 so that the distance from the outer peripheral surface 112A of the inner race 112 in the radial direction of the pulley 78 increases in the clockwise direction in FIG. One end of the first surface 115 is continuous with the protrusion 114. The other end of the first surface 115 is continuous with the second surface 116.

  The second surface 116 extends substantially along the circumferential direction 107. One end of the second surface 116 is continuous with the other end of the first surface 115. The other end of the second surface 116 is continuous with the protrusion 114.

  The roller 113 is arranged between two adjacent protrusions 114. That is, in the present embodiment, the one-way clutch 83 includes the six rollers 113. The number of the rollers 113 is not limited to six, but is determined according to the number of the protrusions 114.

  The distance between the second surface 116 in the radial direction of the pulley 78 and the outer peripheral surface 112 </ b> A of the inner race 112 is larger than the diameter of the roller 113. The distance between the other end of the first surface 115 and the outer peripheral surface 112 </ b> A in the radial direction of the pulley 78 is larger than the diameter of the roller 113. The distance between one end of the first surface 115 and the outer peripheral surface 112 </ b> A in the radial direction of the pulley 78 is smaller than the diameter of the roller 113. Thus, when the roller 113 is located between the first surface 115 and the outer peripheral surface 112A in the radial direction of the pulley 78, the roller 113 is fixed while being sandwiched between the first surface 115 and the outer peripheral surface 112A, and cannot move. It is possible. On the other hand, when the roller 113 is located between the second surface 116 in the radial direction of the pulley 78 and the outer peripheral surface 112A, the roller 113 can move along the circumferential direction 107.

  The inner ring 112 is cylindrical. The shaft 62 </ b> A of the discharge roller 62 is located inside the inner ring 112. A gap 109 is formed between the inner ring 112 and the shaft 62A. A protrusion 117 (an example of a contact portion) is formed on an inner peripheral surface 112 </ b> B of the inner ring 112. The protrusion 117 protrudes inward in the radial direction of the pulley 78, that is, toward the shaft 62A located on the rotation center side of the pulley 78. The protrusion 117 moves in the circumferential direction 107 in synchronization with the rotation of the inner ring 112. The protrusion 117 enters the concave portion 118 of the shaft 62A via the gap 109.

  The shaft 62A has a recess 118. The concave portion 118 is concave from the outer peripheral surface 62B of the shaft 62A toward the radial center of the pulley 78. The recess 118 is formed by a bottom surface 118A and two side surfaces 118B and 118C. The side surfaces 118B and 118C are surfaces that connect the bottom surface 118A and the outer peripheral surface 62B. The side surfaces 118B and 118C face each other at intervals in the circumferential direction 107. The projection 117 that has entered the recess 118 is located between the side surfaces 118B and 118C. The protrusion 117, the side surface 118B, and the side surface 118C are provided between the pulley 78 and the shaft 62A in the rotation transmission path of the transport motor 102. The side surface 118B is an example of a second surface. The side surface 118C is an example of a first surface. The protrusion 117 and the concave portion 118 are examples of an idling portion.

  The distance in the circumferential direction 107 between the side surfaces 118B and 118C is longer by a distance L1 than the length in the circumferential direction 107 of the portion of the protrusion 117 that enters the concave portion 118. In other words, the projection 117 can move up to the distance L1 within the recess 118.

  In the state shown in FIG. 7, when the shaft 62 </ b> A of the discharge roller 62 rotates clockwise with the pulley 78 stopped, (in other words, the discharge roller 62 rotates in the direction to transport the paper 12 in the transport direction 16). When the amount of rotation of the shaft 62A is equal to or greater than a predetermined amount (the amount of rotation by which the side surface 118C moves the distance L1), the side surface 118C pushes the protrusion 117, and the inner ring 112 of the pulley 78 rotates. In other words, the idler causes the discharge roller 62 that rotates in the direction in which the paper 12 is transported in the transport direction 16 to idle the pulley 78 by the rotation amount that the side surface 118C moves the distance L1.

  When the forward rotation of the transport motor 102 is transmitted to the outer ring 111 via the belt 81, the outer ring 111 rotates clockwise as shown in FIG. As a result, the protrusion 114, the first surface 115, and the second surface 116 rotate clockwise as shown in FIG. As a result, the rollers 113 are sandwiched between the first surface 115 and the outer peripheral surface 112A of the inner ring 112. As a result, the inner race 112 rotates integrally with the outer race 111 via the rollers 113. That is, the inner ring 112 rotates clockwise as shown in FIG. As a result, the projection 117 abuts against and pushes the side surface 118B of the recess 118 of the shaft 62A of the discharge roller 62. The shaft 62A rotates integrally with the outer ring 111 and the inner ring 112 in synchronization with the movement of the side surface 118B pressed by the projection 117. As described above, the one-way clutch 83 transmits the forward rotation of the transport motor 102 transmitted to the pulley 78 to the shaft 62A of the discharge roller 62, and rotates the discharge roller 62 in conjunction with the rotation of the pulley 78. .

  Note that the distance in the circumferential direction 107 between the protrusion 117 and the side surface 118C in a state where the protrusion 117 is in contact with the side surface 118B (a state illustrated in FIG. 7) is the above-described distance L1.

  On the other hand, when the reverse rotation of the transport motor 102 is transmitted to the outer ring 111 via the belt 81, the outer ring 111 rotates counterclockwise as shown in FIG. As a result, the protrusion 114, the first surface 115, and the second surface 116 rotate counterclockwise as shown in FIG. 7, and the protrusion 114 moves in a direction away from the roller 113. As a result, as shown in FIG. 8, the roller 113 is located between the second surface 116 and the outer peripheral surface 112 </ b> A of the inner race 112, and becomes movable in the gap 110. Thus, the rotation of the outer ring 111 is not transmitted to the inner ring 112 and the shaft 62A of the discharge roller 62. That is, even if the outer ring 111 rotates, the discharge roller 62 does not rotate. As described above, when the reverse rotation of the transport motor 102 is transmitted, the one-way clutch 83 causes the pulley 78 to idle with respect to the discharge roller 62 and does not rotate the discharge roller 62.

  When the paper 12 sandwiched between the transport roller pair 54 and the discharge roller pair 55 is transported in the transport direction 16 by the forward rotation of the transport motor 102, the rear end of the paper 12 (the upstream end in the transport direction 16) is transported. It comes off from the roller pair 54. That is, the state in which the sheet 12 is nipped from the state in which the sheet 12 is nipped by the pair of transport rollers 54 is changed. At this time, a force in the transport direction 16 instantaneously acting on the paper 12 acts on the discharge roller 62 from the paper 12. With this force, the discharge roller 62 and its shaft 62A rotate clockwise as shown in FIG. Thereby, as shown in FIG. 9, the concave portion 118 of the shaft 62A moves clockwise by the distance L2 shown in FIG. 9, the side surface 118B moves away from the protrusion 117, and the side surface 118C approaches the protrusion 117.

  In the present embodiment, in setting the distance L1, the length of the protrusion 117 in the circumferential direction 107 and the distance of the side surfaces 118B and 118C in the circumferential direction 107 are set such that the distance L1 is larger than the distance L2. That is, the rotation amount of the shaft 62A such that the side surface 118C moves the distance L1 in the clockwise direction shown in FIG. 9 is determined when the paper 12 sandwiched by both the pair of transport rollers 54 and the pair of discharge rollers 55 is transported in the transport direction 16. 9 is larger than the amount of rotation of the shaft 62A that rotates clockwise as shown in FIG. The distance L2 is set such that the sheet 12 sandwiched between the pair of transport rollers 54 and the pair of discharge rollers 55 is transported in the transport direction 16, and the rear end of the sheet 12 (the upstream end in the transport direction 16) is moved to the transport roller pair 54. You can find out by performing an experiment to get out of it.

  Since the distance L1 is greater than the distance L2, the rotation of the shaft 62A in the clockwise direction shown in FIG. That is, the above-mentioned force does not act on the pulley 78 (the inner ring 112 and the outer ring 111). Therefore, even if the discharge roller 62 rotates due to the above force, the pulley 78 does not rotate. That is, the discharge roller 62 idles with respect to the pulley 78. Therefore, the inner race 112 maintains a state in which it can rotate integrally with the outer race 111 via the rollers 113. That is, the one-way clutch 83 is maintained in a state where the drive can be transmitted from the transport roller 60 to the discharge roller 62. That is, since only one of the inner ring 112 and the outer ring 111 does not rotate, no phase difference occurs between the inner ring 112 and the outer ring 111.

  Thereafter, when the forward rotation of the transport motor 102 is transmitted from the transport roller 60 to the outer wheel 111 via the belt 81 and the outer wheel 111 rotates, the inner wheel 112 also rotates via the roller 113. When the protrusion 117 moves the distance L2 by the rotation of the inner ring 112, the protrusion 117 pushes the side surface 118B. Thereby, the discharge roller 62 also rotates.

[Controller 130]
As shown in FIG. 6, the controller 130 includes a CPU 131, a ROM 132, a RAM 133, an EEPROM 134, and an ASIC 135, which are connected by an internal bus 137. The ROM 132 stores programs for the CPU 131 to control various operations. The RAM 133 is used as a storage area for temporarily recording data, signals, and the like used when the CPU 131 executes the program, or as a work area for data processing. The EEPROM 134 stores settings, flags, and the like that should be retained even after the power is turned off.

  The transport motor 102 and the carriage motor 103 are connected to the ASIC 135. The ASIC 135 generates a drive signal for rotating each motor, and controls each motor based on the drive signal. Each motor rotates forward or reverse according to a drive signal from the ASIC 135. For example, the controller 130 controls the driving of the transport motor 102 to drive each roller. Further, the controller 130 controls the driving of the carriage motor 103 to reciprocate the carriage 23. Further, the controller 130 controls the recording head 39 to eject ink from the nozzles 40.

  Further, the sensor 120 and the rotary encoder 121 are connected to the ASIC 135. The controller 130 detects the presence of the sheet 12 at the position where the sensor 120 is arranged, based on the detection signal output from the sensor 120. The controller 130 detects the position of the sheet 12 based on a detection signal output from the sensor 120 and a pulse signal output from the rotary encoder 121.

[Image recording process]
With reference to FIG. 10, an image recording process according to the present embodiment will be described. The image recording process is executed by the CPU 131 of the controller 130. Note that each of the following processes may be executed by the CPU 131 reading and executing a program stored in the ROM 132, or may be realized by a hardware circuit mounted on the controller 130.

  The controller 130 executes an image recording process in response to a recording instruction for recording an image on the sheet 12 (two sheets 12 in the example of FIG. 10) from the user. The acquisition destination of the recording instruction is not particularly limited. For example, the recording instruction may be acquired through the operation unit 17 (see FIG. 1) provided in the multifunction peripheral 10, or may be acquired from an external device through a communication network. The controller 130 records an image on the sheet 12 by controlling the operations of the rollers, the carriage 23, and the recording head 39 according to the acquired recording instruction.

  The controller 130 executes a feeding process of the sheet 12 (this sheet 12 is hereinafter referred to as a preceding sheet 12A (an example of a first sheet)) (S10). The process of feeding the preceding sheet 12A is a process of causing the leading end (downstream end in the transport direction 16) of the preceding sheet 12A supported by the feed tray 20 to reach the transport roller pair 54. In step S10, the controller 130 rotates the feed roller 25 by rotating the transport motor 102 in the reverse direction. When the transport motor 102 rotates in the reverse direction, the feed roller 25 rotates in a direction to transport the preceding sheet 12A backward, and the transport roller 60 rotates in the reverse direction, but the discharge roller 62 does not rotate. When the leading edge of the preceding sheet 12A reaches the pair of transport rollers 54 (S20: Yes), the preceding sheet 12A is corrected for skew by the transport roller 60 that rotates in the reverse direction.

  Next, the controller 130 executes a recording process on the preceding sheet 12A (S30). The recording process on the preceding sheet 12A is a process of recording an image on the preceding sheet 12A. Specifically, in step S30, the controller 130 repeatedly and alternately performs the transport process and the ejection process. The transport process is a process of transporting the preceding sheet 12A that has reached the transport roller pair 54 to at least one of the transport roller pair 54 and the discharge roller pair 55 by a predetermined line feed width in the transport direction 16. The ejection process is a process of causing the recording head 39 to eject ink to the preceding sheet 12A conveyed by a predetermined line feed width.

  The controller 130 rotates the rollers 60 and 62 forward by rotating the transport motor 102 forward in the transport process. Note that the feed roller 25 does not rotate when the transport motor 102 rotates forward. In the ejection process, the controller 130 stops the transport motor 102 to stop the rollers 60 and 62, drives the carriage motor 103 to move the carriage 23 in the left-right direction 9, and at a predetermined timing. The recording head 39 discharges ink.

  When the controller 130 determines that the rear end of the preceding sheet 12A (the upstream end in the first transport direction 16A) has reached the predetermined position (S40: Yes), the controller 130 executes a process of feeding the succeeding sheet 12B (S50).

  As shown in FIG. 11, the predetermined position is a state where the preceding sheet 12A is nipped by the discharge roller pair 55 and not nipped by the conveying roller pair 54, and the rear end P1 of the preceding sheet 12A and the conveying roller The distance along the transport direction 16 between the pair 54 and the holding position P2 of the sheet 12 is a position that is a distance L3. The distance L3 will be described later.

  The succeeding sheet 12B is a sheet located immediately below the preceding sheet 12A in the feeding tray 20, and is a sheet fed to the transport path 65 by the feeding tray 20 next to the preceding sheet 12A. The feeding process of the succeeding sheet 12B is a process of causing the leading end of the succeeding sheet 12B supported by the feeding tray 20 to reach the transport roller pair 54. In step S50, the controller 130 rotates the feeding roller 25 by rotating the transport motor 102 in the reverse direction. Note that when the transport motor 102 rotates in the reverse direction, the discharge roller 62 does not rotate, so that the preceding paper 12A is not transported and remains at a predetermined position. That is, while step S50 is being executed, the recording process on the preceding sheet 12A is interrupted.

  When the succeeding paper 12B reaches the transport roller pair 54 and comes into contact with the transport roller pair 54 (S60: Yes), the recording process on the preceding paper 12A is restarted (S70).

  At the time of transition from the feeding process (S50, S60) to the transport process (S70) in the recording process, the transport motor 102 switches from reverse rotation to normal rotation.

  Here, in the present embodiment, the pulley 78 and the discharge roller 62 have idling portions (the protrusion 117, the side surface 118B, and the side surface 118C). For this reason, when the transport motor 102 rotates forward, as shown in FIG. 7, the protrusion 117 abuts against the side surface 118 </ b> B and pushes, so that the discharge roller 62 rotates forward while the paper 12 is pinched by the transport roller pair 54. The projection 117 may be separated from the side surface 118B when the conveyance motor 102 changes from the normal rotation to the reverse rotation, for example, when the conveyance motor 102 changes from the normal rotation to the reverse rotation (see, for example, FIG. 9). .

  In the state shown in FIG. 9 at the time of the transition, the amount by which the protrusion 117 moves the distance L2 in FIG. 9 until the forward rotation of the transport motor 102 is transmitted to the discharge roller 62 and the discharge roller 62 rotates. Only the pulley 78 idles with respect to the discharge roller 62. In this case, the transport roller 60 rotates forward to transport the succeeding sheet 12B in the transport direction, while the discharge roller 62 is stopped, so that the preceding sheet 12A is stopped. Then, the leading edge of the succeeding sheet 12B may catch up with the trailing edge of the preceding sheet 12A.

  However, in the present embodiment, the distance L3 (see FIG. 11) is set such that the conveyance roller pair 54 is rotated while the pulley 78 rotates a predetermined amount (the rotation amount of the pulley 78 corresponding to the movement of the protrusion 117 by the distance L1). Is set longer than the distance over which the succeeding sheet 12B is transported.

  Here, the distance L1 is the difference between the distance in the circumferential direction 107 between the side surfaces 118B and 118C and the length in the circumferential direction 107 of the portion of the protrusion 117 that enters the recess 118. That is, the amount by which the protrusion 117 moves the distance L1 is the maximum amount of idling of the pulley 78 with respect to the discharge roller 62. Therefore, at the time of transition from the feeding process (S50, S60) to the transporting process (S70) in the recording process, regardless of the position of the protrusion 117 between the side surfaces 118B and 118C, the pulley 78 moves to the discharge roller 62. The leading edge of the succeeding sheet 12B does not catch up with the trailing edge of the preceding sheet 12A due to the idling.

  When the recording process on the preceding sheet 12A is completed, the recording process on the succeeding sheet 12B is started (S80). In the transport process in the recording process on the succeeding sheet 12B, the succeeding sheet 12B is transported in the transport direction 16 by a predetermined line feed width, and the preceding sheet 12A is transported in the transport direction 16 by a predetermined line feed width. Thereby, the preceding sheet 12A is discharged to the discharge tray 21.

  When the recording process on the subsequent sheet 12B is completed, the controller 130 executes a discharge process on the subsequent sheet 12B (S90). The discharge process is a process of causing the discharge roller pair 55 to convey the succeeding sheet 12B on which the image is recorded in the conveyance direction 16 toward the discharge tray 21.

  When the succeeding sheet 12B is discharged to the discharge tray 21, a series of image recording processing is completed. In FIG. 10, an example in which an image is recorded on two sheets of paper 12 has been described. However, when an image is recorded on three or more sheets of paper 12, after step S80, the same as steps S40 to S80 is performed. Is repeated by the number of sheets 12 on which images are recorded. However, in the above steps S40 to S80, the preceding sheet 12A becomes the succeeding sheet 12B, and the succeeding sheet 12B becomes the sheet 12 fed from the feed tray 20 next.

[Effects of the present embodiment]
According to the present embodiment, when the sheet 12 is conveyed in a state where the sheet 12 is sandwiched between both the pair of conveying rollers 54 and the pair of discharging rollers 55, the rear end of the sheet 12 has come off from the pair of conveying rollers 54. At this time, a force in the transport direction 16 instantaneously acting on the paper 12 acts on the discharge roller 62 from the paper 12. This force causes the discharge roller 62 to rotate instantaneously. Here, the predetermined amount by which the idling portion (the protrusion 117 and the concave portion 118) can cause the discharge roller 62 to idle with respect to the pulley 78 is larger than the rotation amount due to the instantaneous rotation of the discharge roller 62. Therefore, the discharge roller 62 idles with respect to the pulley 78. Therefore, since the inner ring 112 of the one-way clutch 83 does not rotate, the one-way clutch 83 is maintained in a state in which drive transmission from the transport roller 60 to the discharge roller 62 is possible. That is, there is no phase difference between the inner wheel 112 and the outer wheel 111 of the one-way clutch 83. Thereafter, when the forward rotation of the transport motor 102 is transmitted from the transport roller 60 to the outer race 111 of the one-way clutch 83 and the outer race 111 rotates, the inner race 112 and the discharge roller 62 of the one-way clutch 83 also rotate.

  Further, according to the present embodiment, the function of the idling portion can be realized with a simple configuration of the protrusion 117 and the concave portion 118.

  Further, according to the present embodiment, since each part of the idling portion (the protrusion 117 and the concave portion 118) is concentratedly arranged near the discharge roller 62, the space occupied by the idling portion can be reduced.

  Further, since the discharge roller 62 idles by a predetermined amount by the idling portion, in order to rotate the discharge roller 62, it may be necessary to rotate the transport motor 102 extra by an amount corresponding to the predetermined amount. However, in this case, the transport roller 60 is additionally rotated by an amount corresponding to the predetermined amount.

  According to the present embodiment, the transport direction 16 between the rear end P1 of the preceding sheet 12A and the nipping position P2 of the succeeding sheet 12B by the transport roller pair 54 in a state where the front end of the subsequent sheet 12B is in contact with the transport roller pair 54. Is longer than the distance by which the subsequent sheet 12B is transported by the transport roller pair 54 while the pulley 78 rotates a predetermined amount (the amount of rotation of the pulley 78 corresponding to the movement of the protrusion 117 by the distance L1). long. Therefore, in this state, even if the transport roller 60 rotates more than the discharge roller 62 by a predetermined amount of rotation of the pulley 78, it is possible to prevent the succeeding sheet 12B from colliding with the preceding sheet 12A.

[Modification]
In the embodiment described above, only one protrusion 117 is provided as shown in FIG. 7, but as shown in FIG. 12, even if a plurality of protrusions 117 (three in FIG. 12) are provided. Good. In this case, the plurality of protrusions 117 are provided on the inner peripheral surface 112 </ b> B of the inner ring 112 at intervals along the circumferential direction 107. In this case, the recesses 118 are provided corresponding to each of the plurality of protrusions 117. That is, in this case, the concave portions 118 are provided in the same number as the protrusions 117. The interval between two adjacent projections 117 may be equal as shown in FIG. 12, or may be different from that shown in FIG.

  According to the embodiment shown in FIG. 12, the rigidity of the member (the pulley 78 and the shaft 62A) provided with the protrusion 117 and the concave portion 118 can be increased.

  In the above-described embodiment, the rollers 60 and 62 in the direction of transporting the paper 12 in the transport direction 16 are normal rotation, and the rollers 60 and 62 in the direction of transporting the paper 12 in the direction opposite to the transport direction 16 are reverse rotation. there were. However, contrary to the above-described embodiment, each of the rollers 25, 60, and 62 in the direction of transporting the sheet 12 in the opposite direction to the transport direction 16 is rotated forward, and each of the rollers 25, 60, and 62 in the direction of transporting the sheet 12 in the transport direction 16 is used. The rollers 60, 62 may be reversed.

  In the above-described embodiment, the transport roller 60 rotates forward when the forward rotation of the transport motor 102 is transmitted, and rotates reverse when the reverse rotation of the transport motor 102 is transmitted. However, contrary to the above-described embodiment, the transport roller 60 may rotate forward when the reverse rotation of the transport motor 102 is transmitted, and may rotate reverse when the forward rotation of the transport motor 102 is transmitted.

  In the above-described embodiment, the protrusion 117 is provided on the inner peripheral surface 112B of the inner ring 112, and the concave portion 118 is provided on the outer peripheral surface 62B of the shaft 62A of the discharge roller 62. However, contrary to the above-described embodiment, the protrusion 117 may be provided on the outer circumferential surface 62B of the shaft 62A of the discharge roller 62, and the concave portion 118 may be provided on the inner circumferential surface 112B of the inner ring 112.

  In the embodiment described above, the idler is provided on the pulley 78 having the one-way clutch 83. However, the idling portion may be provided at a position other than the above-described embodiment as long as it is between the pulley having the one-way clutch 83 and the discharge roller 62 in the transmission path of the rotation of the motor.

  For example, the one-way clutch 83 may be provided on the pulley 77 (see FIG. 4). In this case, the pulley 77 is an example of a rotating body. That is, the rotating body does not necessarily need to rotate around the axis 62A of the discharge roller 62. In this case, the idler provided on the pulley 78 is located at a position different from that of the pulley 77 having the one-way clutch 83, and the pulley 77 having the one-way clutch 83 and the discharge roller 62 in the transmission path of the rotation of the motor. It will be provided between.

  Further, for example, the one-way clutch 83 is provided on the pulley 77 (see FIG. 4), and the pulleys 77 and 78 are connected not through the belt 81 (see FIG. 4) but through a plurality of gears. You may. In this case, if a backlash is formed between two adjacent gears in the plurality of gears, the discharge roller 62 can idle with respect to the pulley 77 due to the backlash. That is, in this case, the plurality of gears on which the backlash is formed can function as the idler. In this case, the total backlash formed by the plurality of gears is determined by the fact that the sheet 12 sandwiched by both the transport roller pair 54 and the discharge roller pair 55 is transported in the transport direction 16 and passes through the transport roller pair 54. Backlash between two adjacent gears in the plurality of gears is set so as to be larger than the amount of rotation of the discharge roller 62 rotated by the force applied from the paper 12 when the sheet is rotated.

10 Multifunction machine (image recording device)
12 ... Paper (sheet)
16: transport direction 54: transport roller pair (first roller pair)
55 ... discharge roller pair (second roller pair)
60: transport roller (first roller)
62.. Discharge roller (second roller)
65 conveyance path 74 transmission unit (first transmission unit)
78 Pulley (rotating body)
83: one-way clutch 102: transport motor (motor)
117: Projection (idling part)
118 ··· Recess (idling part)

Claims (6)

Forward and reverse rotating motors,
It is positioned on the sheet conveyance path, and rotates in a direction in which the sheet is conveyed in the conveying direction by transmitting one of the forward rotation and the reverse rotation of the motor, and the other of the forward rotation and the reverse rotation of the motor is transmitted. A first roller pair having a first roller that rotates in a direction that conveys the sheet in a direction opposite to the conveyance direction,
A second roller pair having a second roller located downstream of the first roller in the transport direction with respect to the first roller in the transport path;
A first transmission unit capable of transmitting the rotation of the motor from the first roller to the second roller,
The first transmission unit includes:
A rotating body having a one-way clutch that transmits one of forward rotation or reverse rotation of the motor to the second roller and does not transmit the other of forward rotation or reverse rotation of the motor to the second roller;
The second roller, which is provided between the rotator and the second roller in the transmission path of the rotation of the motor and rotates in a direction in which the sheet is conveyed in the conveying direction, is moved by a predetermined amount with respect to the rotator. And an idler for idling,
The predetermined amount is rotated by a force applied from the sheet when the sheet sandwiched by both the first roller pair and the second roller pair is conveyed in the conveyance direction and passes through the first roller pair. A conveying device that is larger than the rotation amount of the second roller. The idler is
A first surface and a second surface which are provided at intervals along the rotation direction of the rotating body and are movable in the rotation direction;
A contact portion located between the first surface and the second surface and movable in the rotation direction;
The contact portion, or one of the first surface and the second surface moves in synchronization with the rotation of the rotating body,
The second roller rotates in synchronization with one of the contact portion or the second surface being pushed by the other and moving,
2. The space according to claim 1, wherein an interval in the rotation direction between the contact portion and the first surface in a state where the contact portion and the second surface are in contact with each other is a length corresponding to the predetermined amount. Transport device. The rotating body is provided rotatably around the axis of the second roller,
The contact portion or one of the first surface and the second surface is provided on an inner peripheral surface of the rotating body,
The transport device according to claim 2, wherein the contact portion or the other of the first surface and the second surface is provided on a shaft of the second roller. A plurality of the contact portions are provided at intervals in the rotation direction,
The transport device according to claim 2, wherein the first surface and the second surface are provided corresponding to each of the plurality of contact portions. A tray for supporting the sheets,
A feed roller for feeding the sheet supported by the tray to the transport path,
A second transmission unit that does not transmit one of forward rotation or reverse rotation of the motor to the feed roller, and transmits the other of forward rotation or reverse rotation of the motor to the feed roller;
A sensor that is located upstream of the first roller in the transport direction in the transport direction in the transport path and detects a sheet;
And a controller,
The above controller is
By rotating the motor to one of forward rotation or reverse rotation, the first roller pair, to convey the first sheet located in the conveyance path in the conveyance direction,
In a state where the first sheet is sandwiched between the second roller pair, the motor is rotated to the other of the normal rotation and the reverse rotation, and the second sheet supported by the tray is rotated by the feeding roller. Feed to the transport path,
In a state where the downstream end of the second sheet in the conveying direction is in contact with the first roller pair, the upstream end of the first sheet in the conveying direction, and the position at which the first roller pair sandwiches the sheet. 5. The distance along the transport direction is longer than a distance by which the second sheet is transported by the first roller pair while the rotator rotates by the predetermined amount. 6. Transport device. A transfer device according to any one of claims 1 to 5,
A recording unit that is located between the first roller pair and the second roller pair in the transport path and records an image on a sheet.

Images