JP4492688B2 - Recorded material transport device - Google Patents

Description

  The present invention relates to a recording material conveying apparatus. In particular, the present invention relates to a recording medium conveying apparatus that feeds a recording medium on which recording or printing is performed by ejecting liquid to a liquid ejecting area where liquid is ejected onto the recording medium.

  A liquid ejecting apparatus such as an ink jet recording apparatus incorporates a recording material conveying apparatus. In order to improve the recording throughput in the liquid ejecting apparatus, it is effective to increase the conveyance speed of the recording medium by the recording medium conveyance apparatus. However, the conveyance speed of the recording material is limited depending on the operation state of the liquid ejecting apparatus.

  For example, when a plurality of recording materials are discharged, it is necessary to secure a stacking property in which the discharged recording materials are stacked at substantially the same position on the discharge stacker. In order to ensure stackability, there is a restriction that the discharge speed at which the discharge roller discharges the recording material to the discharge stacker must be a certain value or less, for example, 10 [ips] (inch per second) or less. When the discharge speed of the recording material exceeds a certain value, the electrostatic force mainly due to the charging of the recording material reduces the stacking property. On the other hand, when the recording material is fed to the liquid ejecting region where the liquid is ejected onto the recording material, the feeding roller is faster than the discharging roller at the time of ejection, for example, 14 in order to increase the throughput. It is preferable to transport the recording material by [ips].

  Further, in recent years, a liquid ejecting apparatus is a technique for driving a discharge roller that discharges a recording material that has been recorded and a feeding roller that feeds the next recording material with the same motor for the purpose of cost reduction. Has been developed (see, for example, Patent Document 1).

JP 2002-283649 A

  When a structure in which the discharge roller and the feeding roller are driven by a single motor is employed, each roller rotates at the same speed. In this case, if the rotation speed of the feed roller is increased for the purpose of improving the throughput, the rotation speed of the feed roller is also increased, and there is a problem that stackability cannot be secured.

  SUMMARY An advantage of some aspects of the invention is that it provides a recording medium conveying apparatus that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

That is, according to the first aspect of the present invention, the recording material to be recorded or printed is ejected from the liquid ejecting head toward the recording material to the liquid ejecting region where recording or printing is performed. The recording material transport device for feeding is rotated forward with a feeding roller for feeding the recording material to the liquid ejecting area, a discharge roller for ejecting the recorded or printed material from the liquid ejecting area, Sometimes the feed roller and the discharge roller are rotated by a motor for rotating the recording material in the forward direction, and the motor is driven to prevent the feed roller from being rotated by the motor, and the motor is reversely rotated. The distance between the roller lock mechanism for releasing the rotation prevention of the feeding roller, the rear end of the recording material when recording or printing is completed, and the feeding start position of the recording material to be fed next is , Rotation prevention release When the motor rotates backward, the reverse feed amount that the recording material is reversely fed and the width of the liquid ejecting area in the recording material transport direction are equal to or larger than the sum of the widths of the liquid ejection areas. A feeding control unit that is performed in parallel with the discharge of the recorded matter.

  As a result, the trailing edge of the recording material on which recording has been completed and the leading edge of the recording material to be recorded next are prevented from overlapping during transport, and recording on the recording material to be recorded next is started. In this case, it is possible to prevent unnecessary liquid from being ejected to the rear end of the recording material on which recording has already been completed, and to improve the conveyance throughput.

  Next, the recording material is detected downstream from the feed start position of the recording material to be fed, and is located downstream of the sum of the reverse feed amount and the width of the liquid ejection area in the recording material conveyance direction. The feeding control unit further includes a sensor, and when the recording sensor does not detect the recording object when the recording or printing is completed, the feeding control unit detects the next recording object in parallel with the discharging of the recording object. If the recording sensor detects the recording material when recording or printing is completed, feeding of the next recording material is started after the recording material is completely discharged. May be. Thereby, it can be easily determined based on the detection result by the recording medium sensor whether or not to start feeding the next recording medium.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 is a perspective view of an ink jet recording apparatus 10 which is an example of a liquid ejecting apparatus. The ink jet recording apparatus 10 according to the present embodiment incorporates a recording object conveying apparatus. The recording material transport device includes a feeding roller that feeds the recording material toward the liquid ejecting area, a discharge roller that ejects the recorded material that has been recorded or printed from the liquid ejecting area, a feeding roller, And a step motor 60 for driving the discharge roller. When the recording medium is fed to the liquid ejecting area, the recording medium conveying apparatus rotates the step motor 60 at a higher speed than when the recording medium is discharged from the liquid ejecting area. When the recording or printing is completed, the position of the trailing edge of the recording object is upstream from a predetermined position upstream of the interval between the recording material feeding start position and the liquid ejecting area from the discharge roller. In some cases, the next recording material is fed at a high speed in parallel with the discharge of the recording material. On the other hand, the position of the trailing edge of the recording material when recording or printing is completed is downstream from a predetermined position upstream from the interval between the feeding start position of the recording material and the liquid ejecting area from the discharge roller. In this case, after the discharge of the recording material is completed at a low speed, the next recording material is fed at a high speed.

  In this way, the recording material transport device discharges the recording material on which recording has been completed from the discharge roller at a high speed while feeding the recording material to be recorded next to the liquid ejecting area. To prevent that. Therefore, the rear end of the recording material is discharged at a speed slower than the feeding speed. As a result, the recording medium conveying apparatus can improve the conveying throughput while ensuring the stackability of the discharged recording medium.

  The ink jet recording apparatus 10 is an example of a liquid ejecting apparatus that performs recording or printing by ejecting liquid onto a recording object. The recording head of the ink jet recording apparatus 10 is an example of a liquid ejecting head of the liquid ejecting apparatus. The nozzle provided in the recording head is an example of an ejection port of the liquid ejecting head.

  However, the present invention is not limited to these. Another example of the liquid ejecting apparatus is a color filter manufacturing apparatus that manufactures a color filter for a liquid crystal display. In this case, the color material ejecting head of the color filter manufacturing apparatus is an example of the liquid ejecting head. Still another example of the liquid ejecting apparatus is an electrode forming apparatus that forms electrodes such as an organic EL display and an FED (surface emitting display). In this case, the electrode material (conductive paste) ejecting head of the electrode forming apparatus is an example of the liquid ejecting head. Still another example of the liquid ejecting apparatus is a biochip manufacturing apparatus that manufactures a biochip. In this case, the bio-organic substance ejecting head of the biochip manufacturing apparatus and the sample ejecting head as a precision pipette are examples of the liquid ejecting head. The liquid ejecting apparatus of the present invention includes other liquid ejecting apparatuses having industrial use. Further, the recording object is an object on which recording or printing is performed by ejecting a liquid. For example, a recording paper, a circuit board on which a circuit pattern such as an electrode of a display is printed, a CD-ROM on which a label is printed A preparation on which a DNA circuit is printed is included.

  Next, another configuration of the ink jet recording apparatus 10 will be described with reference to FIGS. 1 and 2. FIG. 2 is a schematic side view of the ink jet recording apparatus 10. In FIG. 2, the ink jet recording apparatus 10 is shown together with the recording object 11 during recording.

  As shown in FIGS. 1 and 2, the ink jet recording apparatus 10 has a recording object tray 12 holding a plurality of recording objects 11, and the recording object 11 pushed out from the recording object tray 12 in a liquid ejecting area. A feeding unit 20 that feeds the recording material, a transport unit 30 that transports the recording material 11 fed by the feeding unit 20 to the liquid ejection region, a recording unit 40 that records on the recording material 11 in the liquid ejection region, A discharge unit 50 for discharging the recorded material 11 from the liquid ejecting area, a discharge stacker 300 for placing the recording material 11 discharged from the discharge unit 50, a step motor 60, a lock lever 70 for locking the carriage, and the ink jet recording apparatus 10 The control part 80 which controls the whole and the detection part 200 are provided. The recording medium tray 12 has a hopper 124 that pushes out the recording medium 11 placed on the recording medium tray 12. The control unit 80 is an example of a motor control unit and a feeding control unit of the present invention. Step motor 60 is an example of the motor of the present invention.

  The feeding unit 20 includes a feeding roller 22 and a retarder roller 24 that rotates around the feeding roller 22. The feeding roller 22 and the retarder roller 24 sandwich the recording material 11 positioned at the top of the bundle of recording materials 11 pushed out from the recording material tray 12 by the hopper 124, and each one. The liquid is supplied to the liquid ejecting region via the transport unit 30.

  The transport unit 30 includes a transport roller 32 that is rotated by a step motor 60, a transport driven roller 34 that rotates with the transport roller 32, and a drive shaft 36 for the transport roller 32. The transport roller 32 rotates while sandwiching the recording material 11 fed by the feed roller 20 between the transport driven roller 34 and transports it to the liquid ejecting region.

  The recording unit 40 includes a carriage 42, a recording head 44, and a motor 48 that moves the carriage 42 shown in FIG. Further, a guide plate 46 is slidably supported in the main scanning direction, which is a direction substantially perpendicular to the feeding direction of the recording material 11.

  The discharge unit 50 includes a discharge roller 52 that is rotated by a step motor 60 and a discharge driven roller 54 that rotates with the discharge roller 52. The discharge roller 52 rotates with the recording object 11 after recording interposed between the discharge driven roller 54 and the discharge roller 52 to discharge from the liquid ejecting area. The discharge stacker 300 stacks and places a plurality of recording objects 11 discharged by the discharge unit 50.

  The power is transmitted to the transport roller 32 and the discharge roller 52 from the step motor 60 via a single belt 62. A tension is applied to the belt 62 by a tensioner 64. The step motor 60, the tensioner 64, the conveyance roller 32, and the discharge roller 52 are arranged in this order in the belt flow direction. On the other hand, power is transmitted from the step motor 60 to the feed roller 22 via a gear and clutch mechanism. When the step motor 60 rotates forward, the feed roller 22, the transport roller 32, and the discharge roller 52 are rotated in the direction of transporting the recording material 11 in the forward direction.

  The lock lever 70 protrudes on the track of the carriage 42 when the ink jet recording apparatus 10 is not operating, thereby preventing the carriage 42 from moving toward the liquid ejecting area. The lock lever 70 is rotated by a step motor 60 via a drive shaft 36 of the transport roller 32 and a gear mechanism 38 provided at an end of the drive shaft 36. When the step motor 60 is rotated in the direction in which the recording material 11 is fed back, the lock lever 70 is rotated in the direction in which the carriage 42 is locked, and the step motor 60 is rotated in the direction in which the recording material 11 is conveyed. Sometimes, the carriage 42 is rotated in the direction to open. The lock lever 70 further prevents the rotation of the feed roller 22 by locking the clutch mechanism that transmits the power of the step motor 60 to the feed roller 22.

  The detection unit 200 is pressed by the carriage 42 and rotates or contacts the recording medium 11. The detection unit 200 rotates in the same direction, the sensor 220 detects rotation of the contact lever 210, and the sensor 220. The determination unit 230 recognizes the carriage 42 or the recording material 11 based on the detection result.

  Here, one end of the contact lever 210 protrudes on the track of the carriage 42, and this one end is pressed by the carriage 42. The contact lever 210 is positioned between the feeding unit 20 and the transport unit 30 in the feeding direction of the recording material 11. Further, the contact lever 210 is located between the liquid ejecting area and the standby position of the carriage 42 in the main scanning direction of the carriage 42.

  The detection unit 200 detects the carriage 42 when the contact lever 210 is pushed by the carriage 42 and is pushed out of the movement path of the carriage 42, and its movement is detected by the sensor 220. Further, the contact lever 210 rotates in a direction in which the recording material is pushed out of the movement path of the carriage 42 by the recording material when the recording material is being conveyed toward the liquid ejecting area. Therefore, the detection unit 200 can detect the recording object.

  In the configuration described above, the control unit 80 ejects liquid from the nozzles of the recording head 44 while reciprocating the carriage 42 along the guide plate 46. The control unit 80 performs recording on the entire recording material 11 by conveying the recording material 11 every time the carriage 42 performs one scan. Note that the ink jet recording apparatus 10 may perform recording in both the forward path and the backward path of the recording head 44, and may perform recording in only one of them.

  Next, a roller lock mechanism that transmits the power of the step motor 60 to the feeding roller 22 will be described. FIG. 3 is a perspective view showing a partial configuration of the roller lock mechanism 400. The roller lock mechanism 400 includes a feed gear 153 connected to the step motor 60 via a gear mechanism, and a clutch 110 that switches whether the driving force transmitted to the feed gear 153 is transmitted to the feed roller shaft 151. With. A feed roller 22 is integrally formed at one end of the feed roller shaft 151, and a clutch 110 and a feed gear 153 are fitted in this order to the other end of the feed roller shaft 151. Further, a hopper vertical cam 152 is integrally formed with the feed roller shaft 151 near the clutch 110 between the feed roller 22 and the clutch 110. The hopper up / down cam 152 transmits the rotational force of the feeding roller shaft 151 to the hopper 124 as power for pushing out the recording material 11 placed on the recording material tray 12.

  FIG. 4 is a perspective view showing details of the feeding gear 153. The feeding gear 153 includes a flange-shaped gear 153a and a boss-shaped gear 153b integrally formed with the gear 153a. The gear 153 a is connected to the step motor 60 through a gear mechanism, and rotates in conjunction with the step motor 60. The clutch 110 in FIG. 3 switches whether to transmit the driving force of the feeding gear 153 to the feeding roller shaft 151 depending on whether the clutch 110 is connected to the gear 153b. That is, the clutch 110 transmits the power of the step motor 60 to the feed roller 22 via the feed roller shaft 151 when connected to the gear 153b, and the clutch 110 of the step motor 60 when not connected to the gear 153b. The power is disconnected from the feeding roller 22.

  FIG. 5 is a perspective view showing details of the clutch 110. The clutch 110 includes a disk 111, a ring 112, and a clutch spring 113. The disk 111 includes, on one side, an annular support shaft 111a that rotatably supports the annular ring 112, and a spring hook 111b that fixes one end of the clutch spring 113. Including a cross-shaped hole 111c into which the front end of the rim is fitted. The clutch spring 113 is provided on the opposite side of the annular support shaft 111 a in the circumferential direction of the annular ring 112. The annular ring 112 includes a protrusion 112a that meshes with the gear 153b of the feeding gear 153 on the inner periphery, and a spring hook 112b that fixes the other end of the clutch spring 113 on the outer periphery, and a lock that the lock lever 70 locks. Part 112c. The locking part 112 c is provided on the opposite side of the annular support shaft 111 a in the circumferential direction of the annular ring 112. The ring 112 is rotatable in a direction in which the spring length of the clutch spring 113 is extended with the ring support shaft 111a of the disk 111 as a fulcrum.

  FIG. 6 is a perspective view showing details of the lock lever 70. The lock lever 70 includes a rotating portion 71 and an arm portion 72 formed to extend from the rotating portion 71. The arm portion 72 includes a holding claw 72 a that locks the carriage 42 and a locking claw 72 b that is locked to the locking portion 112 c of the annular ring 112 at the distal end portion.

  FIG. 7 is a perspective view showing a state of the roller lock mechanism 400 when the rotation of the feeding roller 22 is prevented. The rotating portion 71 of the lock lever 70 is connected to the step motor 60 via the drive shaft 36 of the conveying roller 32 and a gear mechanism 38 provided at the end of the drive shaft 36. The pawl 72b is driven in the direction in which it engages with the engaging portion 112c of the annular ring 112. While the locking claw 72b of the lock lever 70 is locked to the locking portion 112c of the ring 112, the ring 112 has the ring support shaft 111a as a fulcrum and the projection 112a of the ring 112 has moved away from the gear 153b. Waiting for position. In this case, the rotation of the feeding gear 153 is not transmitted to the disk 111 via the ring 112. As described above, the roller lock mechanism 400 prevents the feeding roller 22 from rotating.

  On the other hand, when the step motor 60 rotates in the reverse direction, the feeding gear 153 and the lock lever 70 rotate in the reverse direction, that is, counterclockwise in the drawing. As a result, the locking claw 72b is detached from the locking portion 112c. When the locking claw 72b is disengaged from the locking portion 112c, the ring 112 of the clutch 110 is rotated clockwise around the ring support shaft 111a by the spring force of the clutch spring 113, whereby the protrusion 112a is turned into the gear 153b. Engage with. As a result, the rotational force of the feeding gear 153 that is rotating in reverse is transmitted to the ring 112.

Here, the shapes of the gear 153b and the protrusion 112a are provided in such a shape that the rotational force in the reverse direction of the feeding gear 153 is distributed in the circumferential direction of the feeding gear 153 and in the direction away from the center of the feeding gear 153. It has been. Therefore, the circular ring 112 to which the rotational force of the reversely feeding gear 153 is transmitted reverses the disk 111 and simultaneously rotates counterclockwise with respect to the circular disk 111 around the circular ring support shaft 111a. . At this time, the feed roller shaft 151 and the feed roller 22 are also reversely rotated with the reverse rotation of the disk 111. Then, the recording material 11 shown in FIG. 2 is fed back along with the reverse rotation of the feeding roller 22.
If the projection 112a does not mesh with the gear 153b as a result of the ring 112 rotating counterclockwise with respect to the disc 111 with the ring support shaft 111a as a fulcrum, the ring 112 will be rotated against the reverse rotation of the feeding gear 153. Idle.

  Next, when the stepping motor 60 is rotated forward, the feeding gear 153 and the lock lever 70 start to rotate forward, that is, clockwise in the drawing. Here, due to the spring force of the clutch spring 113, the protrusion 112a meshes with the gear 153b, whereby the locking portion 112c starts to rotate forward. At this time, the locking part 112c is in a position advanced in the forward rotation direction from the locking claw 72b of the arm part 72 by the amount that the protrusion 112a is idled during the reverse rotation of the gear 153b. Therefore, before the locking claw 72b returns to the position where the locking portion 112c is locked by the normal rotation of the lock lever 70, the locking portion 112c passes through the locking position with the locking claw 72b. As described above, the roller lock mechanism 400 cancels the rotation prevention of the feeding roller 22.

  After the locking portion 112c has passed the locking position with the locking claw 72b, the lock lever 70 locks the locking portion 112c of the clutch 110 by the power of the step motor 60 until it makes about one rotation. Return to position. Then, the locking portion 112c of the clutch 110 that has rotated once is locked again by the locking claw 72b of the lock lever 70. In other words, when the rotation prevention by the roller lock mechanism 400 is released, the feeding roller 22 is prevented from rotating again after about one rotation in the forward rotation direction. While the feeding roller 22 makes one rotation in the forward direction, the recording material 11 is fed toward the liquid ejecting area.

  In the ink jet recording apparatus 10 configured as described above, an example of control for improving the conveyance throughput will be described below. In the present embodiment, the control unit 80 controls the rotation direction and rotation speed of the step motor 60 and the operation of the lock lever 70 according to the position of the rear end of the recording object 11 when recording is completed. , Improve transport throughput.

  FIG. 8 is a conceptual diagram illustrating a first example in which the transport operation of the recording object 11 is controlled according to the position of the rear end of the recording object 11. A conveyance path until the recording material 11 is discharged via the feeding roller 22, the conveyance unit 30, and the discharge unit 50 is defined as a path L. A distance A from the feed start position 310 where the feed roller 22 starts feeding the recording material 11 on the path L to the boundary 312 of the liquid ejecting area by the recording head 44 is defined as a distance A. This distance A is a feeding distance when the recording material 11 is fed to the liquid ejecting area. The feeding start position 310 is a position of the recording material 11 when the recording material 11 comes into contact with the feeding roller 22 when the hopper 124 is raised, for example.

  When the position of the rear end of the recording material 11 when the recording is completed is downstream of the position 314 that goes back from the discharge roller 52 along the path L by the distance A, the recording target to be recorded next. When feeding of the recorded material 11 is started, the recorded material 11 is discharged from the discharge roller 52 before the feeding operation is completed.

  Therefore, the ink jet recording apparatus 10 according to the present embodiment includes a detection unit 200a that detects the recording object 11 at a position 322 upstream from the position 314. When the recording or printing is finished, the detection unit 200a The timing for feeding the next recording material 11 is controlled according to whether or not the recording material 11 is detected. The detection unit 200a is an example of the recorded object sensor of the present invention, and is a first example of the installation position of the detection unit 200 described with reference to FIG.

  FIG. 9 is a flowchart illustrating an example of the control operation described in FIG. First, the control unit 80 detects that recording or printing on the recording object 11 has been completed (S100). Next, it is determined whether or not the detection unit 200a has detected the recording material 11 (S102). When it is determined in step 102 that the detection unit 200a has detected the recording material 11 (S102: Yes), the control unit 80 rotates the step motor 60 in the reverse direction to thereby supply the roller lock mechanism 400. The rotation prevention of the feed roller 22 is released, and the recording target 11 to be recorded next is discharged at a high speed, for example, at a speed of 14 [ips] in the liquid ejecting area in parallel with the discharge of the recording target 11 whose recording is completed. Feed (S104). Note that when the step 104 is completed, the discharge of the recording material 11 is not completed, and the discharging is completed in conjunction with the transport operation during the recording operation to the next recording material 11 fed to the liquid ejecting area. .

On the other hand, when it is determined in step 102 that the detection unit 200a has not detected the recording material 11 (S102: No), the control unit 80 maintains the rotation prevention of the feeding roller 22 by the roller lock mechanism 400. In this state, the discharge roller 52 is rotated by rotating the step motor 60 in the forward direction, and the recording material 11 is discharged at a speed at which stackability is ensured, for example, 10 [ips] (S106). Next, the rotation prevention of the feeding roller 22 is released by rotating the step motor 60 in the reverse direction, and the recording object 11 to be recorded next is rotated by rotating the step motor 60 at a higher speed than when discharging the step 106. Are fed at a high speed, for example, at a speed of 14 [ips] (S108). This flow is completed.
According to the above operation, the ink jet recording apparatus 10 can improve the throughput while ensuring stackability.

  FIG. 10 is a conceptual diagram illustrating a second example in which the transport operation of the recording object 11 is controlled according to the position of the rear end of the recording object 11. The ink jet recording apparatus 10 in this example includes a detection unit 200b instead of the detection unit 200a of FIG. Other configurations are the same as those in the example of FIG. In this embodiment, the width of the liquid ejecting area in the transport direction of the recording object 11 is set to the ejecting area width B, and the rotation of the stepping motor 60 reverses when the rotation prevention of the feeding roller 22 is released, whereby the recording object 11 is rotated. The reverse distance is defined as reverse amount C. The detection unit 200b is located at a position 326 further downstream than the position 316 downstream from the position 316 downstream from the feed start position 310 of the recording material 11 to be fed next by the sum (B + C) of the ejection area width B and the reverse feed amount C. Is installed.

  The ink jet recording apparatus 10 according to the present embodiment detects the next recording object 11 depending on whether the detection unit 200b detects the recording object 11 when the recording of the recording object 11 is completed. Control the timing of feeding. The detection unit 200b is another example of the recorded object sensor of the present invention, and is a second example of the installation position of the detection unit 200 described with reference to FIG.

  FIG. 11 is a flowchart illustrating an example of the control operation described in FIG. First, the control unit 80 detects that recording or printing on the recording object 11 has been completed (S200). Next, it is determined whether or not the detection unit 200b has detected the recording object 11 (S202). When it is determined in step 202 that the detection unit 200b has not detected the recording material 11 (S202: No), the control unit 80 rotates the step motor 60 in the reverse direction, thereby supplying the roller lock mechanism 400. The rotation prevention of the feeding roller 22 is released, and the recording medium 11 to be recorded next is fed at a high speed, for example, at a speed of 14 [ips] in parallel with the discharge of the recording medium 11 whose recording is completed. (S204).

  On the other hand, when it is determined in step 202 that the detection unit 200b detects the recording object 11 (S202: Yes), the control unit 80 maintains the rotation prevention of the feeding roller 22 by the roller lock mechanism 400. The discharge roller 52 is rotated by rotating the step motor 60 in the forward direction, and the recording material 11 is discharged at a speed at which stackability is ensured, for example, 10 [ips] (S206). Next, the rotation prevention of the feeding roller 22 is released by rotating the step motor 60 in the reverse direction, and the recording object 11 to be recorded next is rotated by rotating the step motor 60 at a higher speed than when discharging the step 106. For example, at a speed of 14 [ips] (S208). This flow is completed.

  According to the above operation, the recorded object 11 that has been recorded is placed at the tip of the next recorded object 11 even when the step motor 60 rotates in reverse to start feeding the next recorded object 11. It will not be sent back until it overlaps. Further, even if the recording object 11 whose recording has been completed by reverse rotation of the step motor 60 is reversely fed, the distance between the leading edge of the next recording object 11 and the trailing edge of the recording object 11 whose recording has been completed is the ejection area. The width B or more is ensured. Therefore, when the recording of the next recording material 11 is started, the rear end of the recording material 11 on which recording has been completed is located outside the liquid ejecting area of the recording head 44, and therefore unnecessary liquid is ejected. There is no.

  FIG. 12 is a conceptual diagram illustrating a third example in which the transport operation of the recording object 11 is controlled according to the position of the rear end of the recording object 11. In this example, the position of the rear end of the recording object 11 is calculated based on the transport distance of the recording object 11, and the next recording object 11 is determined based on the position of the rear end of the recording object 11 for which recording has been completed. Control the timing of feeding. In this example, the detection unit 200 for recognizing the recording material 11 is provided so as to recognize the presence of the recording material 11 downstream of the feeding start position 310 and upstream of the boundary position 312 of the liquid ejection region. It has been. Since the feed start position 310, the position 316, the position 314, the boundary position 312, the distance A, the injection area width B, and the reverse feed amount C are the same as those in the first and second examples, the description thereof is omitted.

  In this embodiment, the control unit 80 calculates the position of the trailing edge of the recording material 11 when recording is completed based on the transport amount of the recording material 11, and the calculated position of the trailing edge is the start of feeding. The timing of feeding the recording material 11 is controlled based on whether it is more than B + C downstream from the position 310 and more than the distance A upstream from the discharge roller 52. Accordingly, it is possible to prevent both the recording material 11 from being overlapped and soiled, and to ensure stackability, and to improve the transport throughput of the recording material transport device.

  FIG. 13 is a flowchart illustrating an example of the control operation described in FIG. First, the control unit 80 starts feeding the recording material 11 (S300). Next, the detection unit 200 detects the recording object 11 (S302). Subsequently, the control unit 80 detects the recording material 11 based on the rotation amount of the step motor 60 from the time when the detection unit 200 detects the recording material 11 and the position 201 where the detection unit 200 detects the recording material 11. The leading end position is calculated, and based on the calculated leading end position and the length of the recording material 11 in the transport direction, the position of the trailing edge of the recording material 11 is started to be calculated (S304).

  Subsequently, when the feeding of the recording material 11 is completed (S306), the control unit 80 executes recording on the recording material 11 (S308). Next, it is determined whether or not the recording on the recording material 11 is completed (S310). If it is determined in step 310 that the recording has not been completed (S310: No), the process returns to step 308 to execute the recording. If it is determined in step 310 that the recording has been completed (S310: Yes), the control unit 80 determines whether or not the position of the rear end of the recording object 11 that has been recorded is upstream of the position 314. (S312).

  If it is determined in step 312 that the position of the rear end is upstream of the position 314 (S312: Yes), then the position of the rear end of the recording object 11 on which recording is completed is downstream of the position 316. It is determined whether or not (S314). If it is determined in step 314 that the position of the rear end is downstream of the position 316 (S314: Yes), the control unit 80 reverses the step motor 60 to feed the roller lock mechanism 400. The rotation prevention of the roller 22 is released, and the feeding of the recording material 11 to be recorded next is executed at a speed of, for example, 14 [ips] in parallel with the discharge of the recording material 11 whose recording is completed (S316). .

  On the other hand, if it is determined in step 312 that the position of the rear end is not upstream from the position 314 (S312: No), or if it is determined in step 314 that the position of the rear end is not downstream from the position 316 (S314: No), the control unit 80 rotates the discharge roller 52 by rotating the step motor 60 forward while maintaining the rotation prevention of the feeding roller 22 by the roller lock mechanism 400, and the speed at which the stacking property is secured, for example, 10 [ips]. The recording material 11 is discharged at a speed of (S318).

  Next, the rotation prevention of the feeding roller 22 is released by rotating the step motor 60 in the reverse direction, and the recording material to be recorded next is rotated by rotating the step motor 60 at a higher speed than when discharging the step 106. 11 is fed at a speed of, for example, 14 [ips] (S320). This flow is completed. According to the above operation, the ink jet recording apparatus 10 can improve the throughput of recording while satisfying both the securing of the stacking property and the prevention of the overlapping and the contamination of the recording material 11.

As is apparent from the above description, according to the present embodiment, it is possible to improve the recording throughput of the ink jet recording apparatus.
As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above embodiment. It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.
Also, according to the above invention, it is clear that the following has been disclosed.
A recording material transport apparatus for feeding a recording material on which recording or printing is performed by ejecting a liquid to a liquid ejecting region where the liquid is ejected onto the recording material,
A feeding roller for feeding the recording material to the liquid ejecting area;
A discharge roller for discharging the recording object on which recording or printing has been performed from the liquid ejecting area;
A motor for driving the feed roller and the discharge roller;
When feeding the recording material to the liquid ejecting area, a motor control unit that rotates the motor at a higher speed than when discharging the recording material from the liquid ejecting area;
When the recording or printing is completed, the position of the trailing edge of the recording material is upstream from a predetermined position upstream from the interval between the feeding start position of the recording material and the liquid ejecting area from the discharge roller. The recording medium is fed in parallel with the discharge of the recording material, and the position of the trailing edge of the recording material when the recording or printing is completed is the discharge of the recording material. If the recording medium is located downstream of a predetermined position upstream of the interval between the feeding start position of the recording material and the liquid ejecting area from the roller, the next recording material is discharged after the recording material is completely discharged. A recording material transport apparatus comprising: a feeding control unit that starts feeding a recorded material.
Moreover, in the above-mentioned recording material conveying apparatus,
A recording object sensor installed at the predetermined position for detecting the recording object;
The feeding control unit
When recording or printing is completed, if the recording object sensor detects the recording object, the next recording object is fed in parallel with the discharge of the recording object,
When recording or printing is completed, if the recording sensor does not detect the recording object, feeding of the next recording object is started after discharging of the recording object is completed. Recorded object transport device.
Moreover, in the above-described recording material transport apparatus,
When the motor rotates forward, the feeding roller and the discharge roller rotate in a direction in which the recording material is conveyed in a forward direction,
And a roller lock mechanism that is driven by the motor and prevents the feeding roller from rotating by the motor and releases the rotation prevention of the feeding roller by rotating the motor in reverse.
The feeding control unit reverses the recording material from the feeding start position of the recording material to be fed next as the predetermined position by rotating the motor in reverse when releasing the rotation prevention. A recording medium conveying apparatus that uses a downstream position that is equal to or more than the sum of the reverse feeding amount to be fed and the width of the liquid ejection area in the conveyance direction of the recording medium.

1 is a perspective view of an ink jet recording apparatus 10. FIG. 1 is a schematic side view of an ink jet recording apparatus 10. FIG. 5 is a perspective view showing a partial configuration of a roller lock mechanism 400. 5 is a perspective view showing details of a feeding gear 153. FIG. 2 is a perspective view showing details of a clutch 110. FIG. 3 is a perspective view showing details of the lock lever 70. FIG. 4 is a perspective view of a roller lock mechanism 400. FIG. FIG. 6 is a first conceptual diagram illustrating an example of controlling a transport operation of a recording material 11. 2 is a first operation example of the ink jet recording apparatus 10. FIG. 6 is a second conceptual diagram illustrating an example of controlling the conveyance operation of the recording material 11. 2 is a second operation example of the ink jet recording apparatus 10. FIG. 10 is a third conceptual diagram illustrating an example of controlling the conveyance operation of the recording object 11. 4 is a third operation example of the ink jet recording apparatus 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Inkjet recording device, 12 Recorded object tray, 20 Feeding part, 22 Feeding roller, 24 Retarder roller, 30 Conveying part, 32 Conveying roller, 34 Conveying driven roller, 36 Drive shaft, 38 Gear mechanism, 40 Recording part , 42 Carriage, 44 Recording head, 46 Guide plate, 48 Motor, 50 Ejection part, 52 Ejection roller, 54 Ejection driven roller, 60 Step motor, 70 Lock lever, 72a Holding claw, 72b Engagement claw, 80 Control part, 110 Clutch, 111 disc, 112 ring, 112a protrusion, 112c locking portion, 113 clutch spring, 151 feed roller shaft, 153 feed gear, 200 detection unit, 210 contact lever, 220 sensor, 230 judgment unit

Claims (2)

A recording material transport apparatus for recording a recording object to be recorded or printed, a liquid ejecting head ejecting liquid toward the recording object, and feeding the recording material to a liquid ejecting area where recording or printing is performed,
A feeding roller for feeding the recording material to the liquid ejecting area;
A discharge roller for discharging the recording object on which recording or printing has been performed from the liquid ejecting area;
A motor that rotates the feeding roller and the discharge roller in a direction in which the recording material is conveyed in a forward direction when rotated forwardly;
A roller lock mechanism that is driven by the motor and prevents the feeding roller from rotating by the motor and releases the rotation prevention of the feeding roller by the motor rotating in reverse;
The distance between the rear end of the recording material when recording or printing is completed and the feeding start position of the recording material to be fed next is determined by the reverse rotation of the motor when the rotation prevention is canceled. When the recording material is reversely fed and the sum of the widths of the liquid ejecting areas in the conveyance direction of the recording material, the next recording material is fed in parallel with the discharge of the recording material. A recording medium conveying apparatus including a feeding control unit that performs the above-described process. Installed downstream of the sum of the reverse feed amount and the width of the liquid ejection area in the recording material transport direction from the feed start position of the recording material to be fed next, and detects the recording material And a recorded object sensor for
The feeding control unit, when recording or printing is completed, if the recording sensor does not detect the recording object, the next recording object in parallel with the discharge of the recording object To feed
When the recording sensor detects the recording object when recording or printing is completed, the feeding of the next recording object is started after the discharging of the recording object is completed. The recorded article conveying apparatus according to claim 1.

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