JP5214514B2 - Conveying device and fluid ejection device - Google Patents

Description

  The present invention relates to a fluid ejecting apparatus such as an ink jet printer and a transport apparatus that transports a target that is provided in the fluid ejecting apparatus and ejects a fluid.

  In general, ink jet printers (hereinafter referred to as “printers”) are widely known as fluid ejecting apparatuses that eject fluid from a fluid ejecting head. Among such printers, there is a so-called line head printer that performs printing by ejecting ink (fluid) from a recording head (fluid ejecting head) onto a recording sheet (target) being conveyed.

  Such a line head printer includes a print transport unit that transports while sucking the recording paper being printed, and a paper discharge transport unit that transports the printed recording paper transported from the print transport unit to the downstream side while sucking it. There is a thing provided with the conveyance device which has. Conventionally, as a transport device provided with a suction device (suction means), the one provided in the copying machine described in Patent Document 1 is known. In other words, the transport device disclosed in Patent Document 1 can change the suction force applied to the transfer paper being transported according to the type of transfer paper (target).

JP-A-1-104560

  By the way, some of the above-described line head printer transport devices are set so that the transport speed of the paper discharge transport section is faster than the transport speed of the print transport section so that the recording paper being printed does not loosen. However, in this case, since the recording sheet being printed is pulled downstream by the paper discharge conveyance unit, the printed image on the recording sheet is adversely affected. For this reason, contrary to the above case, if the transport speed of the paper discharge transport section is set to be slower than the transport speed of the print transport section, the recording paper is caused by the transport speed difference between the print transport section and the paper discharge transport section. There is a problem that the printed image on the recording paper may be adversely affected by being curved so as to rise.

Note that this problem cannot be solved even if the transport device of Patent Document 1 is used in the above-described line head printer.
The present invention has been made paying attention to such problems existing in the prior art. The purpose is to provide a transport device and a fluid ejection device capable of suppressing the curving of the target being transported due to the transport speed difference when the downstream transport speed is made slower than the upstream transport speed. It is to provide.

  In order to achieve the above object, a transport apparatus according to the present invention is a transport apparatus that transports a target from an upstream side to a downstream side, and is disposed to face a fluid ejecting head capable of ejecting a fluid, and A first transport unit that transports the target to which fluid is ejected, and the first transport while being suctioned by a suction means that is positioned downstream of the first transport unit and after the fluid has been ejected A second transport unit that transports the target at a lower speed than the first transport unit, wherein the suction unit is capable of sucking the target on the upstream side of the second transport unit, and the downstream side of the second transport unit And a second suction means capable of sucking the target, and a control means for controlling the suction operation of the first suction means and the second suction means based on the length of the target in the transport direction With.

  According to this invention, the control means stops the first suction means when the length of the target in the transport direction is long enough to straddle between the first transport section and the downstream side of the second transport section. In addition, by controlling the second suction unit to perform the suction operation, it is possible to shorten the operation time of the pressing force applied to the target due to the transport speed difference between the first transport unit and the second transport unit. Therefore, it is possible to suppress the curving of the target being transported due to the transport speed difference when the downstream transport speed is made slower than the upstream transport speed.

  In the transport apparatus of the present invention, when the length of the target in the transport direction is larger than the first threshold and smaller than a second threshold that is larger than the first threshold, When both the first suction means and the second suction means are suctioned, and the length of the target in the transport direction is larger than a third threshold value that is larger than the second threshold value, The suction operation of the first suction unit is stopped and the second suction unit is controlled to perform the suction operation. The first threshold value is a first threshold value that can apply a transport force to the target in the first transport unit. The distance from the downstream end of one region to the upstream end of the second region where the first suction means can apply the suction force to the target in the second transport unit, and the second threshold value is The first transport The distance from the downstream end of the fluid ejection region where the fluid is ejected to the target to the upstream end of the second region, and the third threshold is the second end from the downstream end of the first region. This is the distance to the upstream end of the third region where the second suction means can apply a suction force to the target in the transport section.

  According to this invention, the length in the transport direction of the target is from the downstream end of the first region to the upstream end of the third region where the second suction unit can apply a suction force to the target in the second transport unit. When the control unit stops the suction operation of the first suction unit and performs the suction operation of the second suction unit when the distance is greater than the third threshold value, the first transport unit and the second transport unit. It is possible to shorten the operation time of the pressing force applied to the target due to the difference in the conveyance speed with the part. Accordingly, it is possible to suppress the target being bent from being bent due to the difference in the conveyance speed when the conveyance speed of the second conveyance unit is made slower than the conveyance speed of the first conveyance unit.

In the transport apparatus according to the present invention, the first transport unit includes a third suction unit capable of sucking the target.
According to the present invention, the target can be stably transported in the first transport unit.

The fluid ejecting apparatus of the present invention includes the transport device having the above-described configuration and a fluid ejecting head capable of ejecting the fluid onto the target transported by the transport device.
According to the present invention, it is possible to accurately inject the fluid onto the target by suppressing the target being bent by the transfer device having the above configuration.

1 is a schematic diagram illustrating a schematic configuration of an ink jet printer according to an embodiment. FIG. 2 is a block diagram showing an electrical configuration of the printer. The schematic diagram which shows schematic structure of the inkjet type printer of the example of a change. The schematic diagram which shows schematic structure of the inkjet type printer of the example of a change.

  Hereinafter, an embodiment in which a fluid ejecting apparatus of the invention is embodied in an ink jet printer will be described with reference to the drawings. In the following description, “left and right direction” and “up and down direction” refer to the left and right direction and up and down direction indicated by arrows in FIG. 1, respectively, and “front and back direction” refers to the page in FIG. It shall indicate an orthogonal direction.

  As shown in FIG. 1, an ink jet printer 11 as a fluid ejecting apparatus conveys a cut sheet 12 as a target from a left side (upstream side) to a right side (downstream side) in a main body frame (not shown). And a recording head 14 having a rectangular parallelepiped shape as a fluid ejecting head capable of ejecting ink as a fluid from a plurality of nozzles 14a onto the cut paper 12 transported by the transporting device 13.

  The transport device 13 includes a print transport unit 13A serving as a first transport unit disposed so as to face the recording head 14, and an upstream paper discharge transport unit 13B disposed on the right side (downstream side) of the print transport unit 13A. (Upstream transport unit) and a downstream paper discharge transport unit 13C (downstream transport unit) disposed on the right side (downstream side) of the upstream paper transport unit 13B. In the present embodiment, a printing unit for printing the cut sheet 12 is configured by the recording head 14 and the print conveyance unit 13A, and printing is performed by the upstream discharge conveyance unit 13B and the downstream discharge conveyance unit 13C. A paper discharge unit is configured as a second transport unit for discharging the cut paper 12 that has been printed by the printing unit.

  The print transport unit 13A includes a rectangular plate-like platen 15 that is long in the left-right direction. A driving roller 16 extending in the front-rear direction is disposed on the right side of the platen 15 so as to be rotationally driven by a printing transport motor 17A, while a driven roller 18 extending in the front-rear direction is rotatably disposed on the left side of the platen 15. . Further, a tension roller 19 extending in the front-rear direction is rotatably disposed below the platen 15.

  As shown in FIG. 1, an endless conveying belt 20 having a large number of through holes (not shown) is wound around the driving roller 16, the driven roller 18, and the tension roller 19 so as to surround the platen 15. Yes. In this case, the tension roller 19 is urged downward by a spring member (not shown), and by applying tension to the conveyor belt 20, the slack of the conveyor belt 20 is suppressed. .

  Then, by rotating the driving roller 16 in the clockwise direction when viewed from the front side, the conveying belt 20 is rotated in the clockwise direction when the outside of the driving roller 16, the tension roller 19 and the driven roller 18 is viewed from the front side. It has become. In this case, the inner surface of the conveyor belt 20 slides on the upper surface of the platen 15 from the left side toward the right side, and the cut paper 12 on the conveyor belt 20 moves from the upstream side on the left side to the downstream side on the right side. It is designed to be transported.

  In addition, a large number of suction holes (not shown) are opened on the upper surface of the platen 15, and the cut sheet 12 at a position facing the upper surface of the platen 15 is for printing as a third suction means provided on the platen 15. The suction fan 21A sucks the platen 15 through the transport belt 20 through the suction holes (not shown). That is, the cut sheet 12 in the region corresponding to the upper surface of the platen 15 on the transport belt 20 is sucked onto the transport belt 20 by the printing suction fan 21A.

  The area on the platen 15 in the print transport unit 13A is provided with a suction force by the printing suction fan 21A, and therefore can be applied with a transport force (suction transport force) while sucking the cut paper 12. One region T1. Further, an area facing (corresponding to) the recording head 14 on the platen 15 of the print transport unit 13 </ b> A is an ink ejection area F as a fluid ejection area where ink is ejected onto the cut paper 12.

  The recording head 14 is supplied with ink of each color from an ink cartridge (not shown), and is supplied from the nozzles 14a to the cut paper 12 conveyed by the print conveying unit 13A in the ink ejection area F. Printing is performed by ejecting each ink.

  The upstream paper discharge transport unit 13B changes the print transport motor 17A to the upstream paper discharge transport motor 17B in the print transport unit 13A, and uses the print suction fan 21A as an upstream paper discharge suction fan 21B as a first suction means. Other than these, the configuration is the same as that of the print transport unit 13A. The region on the platen 15 in the upstream paper discharge conveyance unit 13B is provided with a conveyance force (suction conveyance force) while sucking the cut paper 12 because the suction force by the upstream paper discharge suction fan 21B reaches. The second region T2 is possible.

  The downstream paper discharge transport unit 13C changes the printing transport motor 17A to the downstream paper discharge transport motor 17C in the print transport unit 13A, and the downstream paper discharge suction fan 21C using the printing suction fan 21A as the second suction means. Other than these, the configuration is the same as that of the print transport unit 13A. The area on the platen 15 in the downstream paper discharge conveyance unit 13C is subjected to the suction force by the downstream paper discharge suction fan 21C, so that a conveyance force (suction conveyance force) while sucking the cut paper 12 is given. The third region T3 is possible.

  The distance from the right end (downstream end) of the first region T1 to the left end (upstream end) of the second region T2 is the first distance L1 as the first threshold, and the right end (downstream end) of the ink ejection region F. From the right end (downstream end) of the first region T1 to the left end (upstream end) of the third region T3 is the second distance L2 as the second threshold value. Is the third distance L3 as the third threshold. Therefore, the second distance L2 is longer than the first distance L1, and the third distance L3 is longer than the second distance L2. The distance from the right end (downstream end) of the ink ejection area F to the left end (upstream end) of the third area T3 is a fourth distance L4.

Next, the electrical configuration of the ink jet printer 11 will be described.
As shown in FIG. 2, the ink jet printer 11 includes a control unit 22 as a control unit that controls the operating state of the ink jet printer 11. The control unit 22 includes a printing suction fan 21A, an upstream discharge suction fan 21B, a downstream discharge suction fan 21C, a printing transport motor 17A, an upstream discharge transport motor 17B, and a downstream discharge transport motor 17C. Each is electrically connected.

  The control unit 22 controls the suction operations of the printing suction fan 21A, the upstream discharge suction fan 21B, and the downstream discharge suction fan 21C, as well as the printing transport motor 17A and the upstream discharge transport motor. The drive of 17B and the downstream side discharge conveyance motor 17C are each controlled.

  Furthermore, an input device 23 for inputting the size of the cut paper 12 to be printed by the ink jet printer 11 is electrically connected to the control unit 22. The input device 23 allows the user to select and input whether the size of the cut sheet 12 to be printed is A4 size or A3 size. Then, when the cut sheet 12 is A4 size, the controller 22 causes the suction fan 21A for printing, the upstream discharge suction fan 21B, and the downstream discharge suction fan 21C to perform a suction operation so that the cut sheet 12 is A3. In the case of the size, a program for causing the suction suction fan 21A for printing and the downstream discharge suction fan 21C to perform the suction operation and stopping the suction operation of the upstream discharge suction fan 21B is stored.

  In this embodiment, the length of the A4 size cut sheet 12 in the conveyance direction (left and right direction) is longer than the first distance L1 and shorter than the second distance L2, and the A3 size cut sheet 12 is conveyed. The ink jet printer 11 is set so that the length in the direction (left-right direction) is longer than the third distance L3 and shorter than the fourth distance L4.

Next, the operation of the ink jet printer 11 will be described.
(When printing on A4 size cut paper 12)
When printing on A4 size cut paper 12, first, the ink jet printer 11 is turned on. Then, the control unit 22 determines that the conveyance speed of the upstream discharge conveyance unit 13B and the downstream discharge conveyance unit 13C is slightly slower than the conveyance speed of the print conveyance unit 13A, and the upstream discharge conveyance unit 13B and the downstream side. The printing transport motor 17A, the upstream paper discharge transport motor 17B, and the downstream paper discharge transport motor 17C are driven so that the transport speed of the paper discharge transport unit 13C is the same.

  Subsequently, when the input device 23 inputs that the cut sheet 12 is A4 size, the input device 23 transmits a signal to the control unit 22 that the cut sheet 12 to be printed is A4 size. When the control unit 22 receives this signal, the control unit 22 performs the printing suction fan 21A, the upstream discharge suction fan 21B, and the downstream discharge suction fan 21C based on the program stored in the control unit 22. Operate the suction.

  When the A4 size cut sheet 12 is fed onto the print transport unit 13A from the left side, the cut sheet 12 is transported from the left side toward the right side. At this time, the cut paper 12 is conveyed while being attracted onto the conveyance belt 20 in the first region T1, and printing is performed by ejecting each ink from each nozzle 14a of the recording head 14 in the process of passing through the ink ejection region F. An image is formed).

  Subsequently, the printed cut sheet 12 is transported from the print transport unit 13A to the upstream paper discharge transport unit 13B. When the right end portion of the cut sheet 12 reaches the second region T2 where the suction force of the upstream discharge suction fan 21B reaches, the cut sheet 12 is longer in the transport direction than the first distance L1. Therefore, the left end portion of the cut sheet 12 is still located in the first region T1 to which the suction force of the printing suction fan 21A extends.

  For this reason, due to the difference in the conveyance speed while sucking between the print conveyance unit 13A and the upstream side discharge conveyance unit 13B, a pressing force is applied to the cut sheet 12 so as to bend the cut sheet 12 so that it rises. Since the cut sheet 12 is shorter in the transport direction than the second distance L2, the time during which the cut sheet 12 is subjected to a pressing force due to the transport speed difference between the print transport unit 13A and the upstream discharge transport unit 13B is short. Therefore, the cut sheet 12 is hardly curved so as to rise.

  In this case, even if the cut sheet 12 is curved so as to rise, when the right end portion of the cut sheet 12 reaches the second region T2, the left end portion of the cut sheet 12 is already on the right side of the ink ejection region F. Therefore, the print image formed on the cut paper 12 is not affected. Subsequently, the cut sheet 12 is conveyed from the upstream side discharge conveyance unit 13B to the downstream side discharge conveyance unit 13C, and then discharged to a predetermined position.

(When printing on A3 size cut paper 12)
When printing the A3 size cut paper 12, the fact that the cut paper 12 is A3 size is input to the input device 23 from the state where the cut paper 12 is A4 size. Then, a signal that the cut sheet 12 to be printed is A3 size is transmitted from the input device 23 to the control unit 22. When the control unit 22 receives this signal, the control unit 22 continues the suction operation of the printing suction fan 21A and the downstream discharge suction fan 21C based on the program stored in the control unit 22, and the upstream side. The suction operation of the side discharge suction fan 21B is stopped.

  When the A3 size cut sheet 12 is fed onto the print transport unit 13A from the left side, the cut sheet 12 is transported from the left side toward the right side. At this time, the cut paper 12 is conveyed while being attracted onto the conveyance belt 20 in the first region T1, and printing is performed by ejecting each ink from each nozzle 14a of the recording head 14 in the process of passing through the ink ejection region F. An image is formed).

  Subsequently, the printed cut sheet 12 is transported from the print transport unit 13A to the upstream paper discharge transport unit 13B. When the right end portion of the cut sheet 12 reaches the second region T2, the cut sheet 12 is much longer in the transport direction than the second distance L2, and thus the cut sheet 12 is still in the transport direction. The central portion is printed in the ink ejection area F.

  Here, as in the case where the cut sheet 12 is A4 size, if the upstream side discharge suction fan 21B is suctioned when the right end portion of the cut sheet 12 passes through the second region T2, the print transport unit 13A. Due to the difference in conveyance speed while sucking between the sheet discharge upstream unit 13B and the upstream sheet discharge conveyance unit 13B, a pressing force is applied to the cut sheet 12 so as to bend the cut sheet 12 so as to rise. The pressing force against the cut paper 12 continues to work for a long time until the left end portion of the cut paper 12 passes through the first region T1 to which the suction force of the printing suction fan 21A is applied. As a result, the cut paper 12 is greatly curved so as to rise, and the cut paper 12 is not only damaged, but there is a possibility that a print image formed on the cut paper 12 is adversely affected and print quality is deteriorated.

  In this regard, in this embodiment, since the suction operation of the upstream-side sheet discharge suction fan 21B is stopped, the cut sheet 12 is not attracted onto the transport belt 20 in the second region T2. For this reason, when the right end portion of the cut sheet 12 passes through the second region T2, a pressing force for curving the cut sheet 12 due to a difference in conveyance speed between the print conveyance unit 13A and the upstream-side discharge conveyance unit 13B. Does not work.

  Subsequently, the cut sheet 12 is conveyed from the upstream sheet discharge conveyance unit 13B to the downstream sheet discharge conveyance unit 13C, and the right end portion of the cut sheet 12 reaches the third area T3 where the suction force of the downstream sheet discharge suction fan 21C is exerted. Since the cut paper 12 is longer in the transport direction than the third distance L3, the left end portion of the cut paper 12 is still in the first region T1 where the suction force of the printing suction fan 21A is still applied. Is located.

  For this reason, due to the difference in conveyance speed while suctioning between the print conveyance unit 13A and the downstream paper discharge conveyance unit 13C, a pressing force is applied to the cut paper 12 so as to bend the cut paper 12 so as to rise. Since the cut sheet 12 is shorter in the conveyance direction than the fourth distance L4, the time during which the cut sheet 12 is subjected to the pressing force due to the conveyance speed difference between the print conveyance unit 13A and the downstream-side discharge conveyance unit 13C is short. Therefore, the cut sheet 12 is hardly curved so as to rise.

  In this case, even if the cut sheet 12 is curved so as to rise, when the right end portion of the cut sheet 12 reaches the third region T3, the left end portion of the cut sheet 12 moves to the right side of the ink ejection region F. Since it is moving, there is no influence on the print image formed on the cut paper 12. Subsequently, the cut sheet 12 is conveyed on the downstream side discharge conveyance unit 13C, and is then discharged to a predetermined position.

  As described above, when printing on the A4 size cut sheet 12, the suction suction fan 21A for printing, the upstream discharge suction fan 21B, and the downstream discharge suction fan 21C are all operated to perform the suction operation. The paper 12 can be smoothly conveyed without being curved. On the other hand, when printing the A3-size cut sheet 12, only the upstream discharge suction fan 21B among the suction fan 21A for printing, the upstream discharge suction fan 21B, and the downstream discharge suction fan 21C is suctioned. By stopping the operation, the cut paper 12 can be smoothly conveyed without being bent.

  Therefore, even if the length of the cut sheet 12 to be printed changes in the conveyance direction, the upstream sheet discharge suction fan 21B is caused to perform a suction operation or stop according to the length of the cut sheet 12 in the conveyance direction. The cut sheet 12 can be smoothly conveyed without being curved.

As described above, according to the embodiment described in detail, the following effects can be obtained.
(1) When the control unit 22 performs printing on the A3 size cut sheet 12 having a length in the transport direction (left-right direction) longer than the third distance L3 and shorter than the fourth distance L4, the upstream discharge is performed. The suction operation of the suction fan 21B is stopped and the suction fan 21A for printing and the downstream discharge suction fan 21C are suctioned. For this reason, the working time of the pressing force applied to the cut sheet 12 can be shortened by the difference in the conveyance speed while sucking between the printing conveyance unit 13A and the downstream discharge conveyance unit 13C. It is possible to prevent the cut sheet 12 being conveyed from being bent.

(2) Since the platen 15 of the print transport unit 13A is provided with the printing suction fan 21A capable of sucking the cut paper 12, the print transport unit 13A can stably transport the cut paper 12 while sucking it. it can. For this reason, since ink can be ejected from the recording head 14 to the cut paper 12 with high accuracy, the print quality of the cut paper 12 can be maintained.
(Example of change)
In addition, you may change the said embodiment as follows.

  As shown in FIG. 3, the print transport unit 13A may be changed from a belt transport system to a roller transport system. That is, the print transport unit 13A includes a platen 15, a pair of upper and lower sheet feed driving rollers 24 arranged on the left side (upstream side) of the platen 15, and a pair of upper and lower sides arranged on the right side (downstream side) of the platen 15. The paper discharge drive roller 25 may be used. In this case, in the print transport unit 13A, the cut paper 12 is fed onto the platen 15 while being pinched by the paper feed drive roller 24, printed on the platen 15, and then pinched by the paper discharge drive roller 25. While being pressed, the sheet is conveyed from above the platen 15 to the upstream side discharge conveyance unit 13B. In this case, since the platen 15 of the print transport unit 13A is not provided with the printing suction fan 21A, the cut sheet 12 is not sucked on the platen 15.

  As shown in FIG. 4, the upstream side discharge conveyance unit 13 </ b> B and the downstream side discharge conveyance unit 13 </ b> C may be integrally formed. That is, the downstream discharge conveyance unit 13C is omitted, and in the upstream discharge conveyance unit 13B, the platen having the downstream discharge suction fan 21C on the right side (downstream side) of the platen 15 having the upstream discharge suction fan 21B. 15 may be arranged so as to be adjacent to each other, and the distance between the driving roller 16 and the driven roller 18 may be increased by the amount of the additionally arranged platen 15 and the length of the conveying belt 20 may be increased. If it does in this way, the number of parts of ink jet printer 11 (conveyance device 13) can be reduced.

  In the above embodiment, whether or not the upstream discharge suction fan 21B is operated for suction is switched depending on whether the size of the cut sheet 12 is A4 or A3. For example, B5 and B4, B5 and A3, B5 and A4, B4 and A3, A4 and B4, and the like may be appropriately changed. In this case, the first distance L1 to the fourth distance L4 of the inkjet printer 11 (conveyance device 13) also need to be changed as appropriate according to the combination of the sizes of the cut sheets 12 to be used.

  A sensor that detects the size of the cut sheet 12 may be provided, and the control unit 22 may determine the size of the cut sheet 12 based on a signal transmitted from the sensor. This eliminates the need for the user to input the size of the cut paper 12 to be printed from the input device 23.

-Instead of the cut paper 12, a flexible plastic film sheet or cloth may be used as a target.
In the above embodiment, the ink jet printer 11 is employed, but a fluid ejecting apparatus that ejects or ejects fluid other than ink may be employed. Further, the present invention can be used for various liquid ejecting apparatuses including a liquid ejecting head that ejects a minute amount of liquid droplets. In this case, the droplet refers to the state of the liquid ejected from the liquid ejecting apparatus, and includes liquid droplets having a granular shape, a tear shape, and a thread shape. The liquid here may be any material that can be ejected by the liquid ejecting apparatus. For example, it may be in a state in which the substance is in a liquid phase, such as a liquid with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts ) And liquids as one state of the substance, as well as those obtained by dissolving, dispersing or mixing particles of a functional material made of solid materials such as pigments and metal particles in a solvent. Further, representative examples of the liquid include ink and liquid crystal as described in the above embodiment. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot-melt inks. As a specific example of the liquid ejecting apparatus, for example, a liquid containing a material such as an electrode material or a coloring material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface light emitting display, a color filter or the like in a dispersed or dissolved form. It may be a liquid ejecting apparatus for ejecting, a liquid ejecting apparatus for ejecting a bio-organic matter used for biochip manufacturing, a liquid ejecting apparatus for ejecting a liquid used as a precision pipette, a printing apparatus, a microdispenser, or the like. In addition, transparent resin liquids such as UV curable resin to form liquid injection devices that pinpoint lubricant oil onto precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. A liquid ejecting apparatus that ejects a liquid onto the substrate or a liquid ejecting apparatus that ejects an etching solution such as an acid or an alkali to etch the substrate may be employed. The present invention can be applied to any one of these liquid ejecting apparatuses.

Furthermore, the technical idea which can be grasped from the above embodiment will be described below.
(A) The second transport unit includes an upstream transport unit positioned on the upstream side and a downstream transport unit positioned on the downstream side of the upstream transport unit,
The first suction unit is provided in the upstream side transport unit, and the second suction unit is provided in the downstream side transport unit. 5. The conveying apparatus as described in.

  DESCRIPTION OF SYMBOLS 11 ... Inkjet printer as fluid ejecting apparatus, 13 ... Conveying device, 13A ... Print conveying unit as first conveying unit, 13B ... Upstream discharge conveying unit constituting second conveying unit, 13C ... Second conveying unit , A downstream discharge unit, 12 a cut sheet as a target, 14 a recording head as a fluid ejecting head, 21 A a printing suction fan as a third suction unit, and 21 B a first suction unit. An upstream sheet discharge suction fan as suction means, 21C... A downstream sheet discharge suction fan as second suction means constituting the suction means, 22... A control section as control means, F... An ink ejection area as a fluid ejection area , L1... First distance as a first threshold, L2... Second distance as a second threshold, L3... Third distance as a third threshold, T1. ... the second area, T3 ... the third area.

Claims (4)

A transport device for transporting a target from the upstream side toward the downstream side,
A first transport unit disposed opposite to a fluid ejecting head capable of ejecting fluid and transporting the target from which the fluid is ejected, and the fluid is ejected at a position downstream of the first transport unit. A second transport unit that transports the target after being sucked by a suction unit at a speed slower than the first transport unit,
The suction means includes a first suction means capable of sucking the target on the upstream side in the second transport section, and a second suction means capable of sucking the target on the downstream side in the second transport section,
A transport apparatus comprising control means for controlling the suction operation of the first suction means and the second suction means based on the length of the target in the transport direction. When the length of the target in the transport direction is larger than a first threshold and smaller than a second threshold that is larger than the first threshold, the control means When both of the second suction means are operated for suction, and the length of the target in the transport direction is larger than a third threshold value that is larger than the second threshold value, the suction operation of the first suction means is performed. Control to stop and suction the second suction means;
The first threshold value is determined by the first suction unit to the target in the second transport unit from the downstream end of the first region where the transport force can be applied to the target in the first transport unit. A distance to the upstream end of the second region capable of applying a suction force;
The second threshold is a distance from a downstream end of a fluid ejection region where the fluid is ejected to the target in the first transport unit to an upstream end of the second region,
The third threshold is a distance from the downstream end of the first region to the upstream end of the third region where the second suction unit can apply a suction force to the target in the second transport unit. The transport apparatus according to claim 1, wherein the transport apparatus is provided. The transport apparatus according to claim 1, wherein the first transport unit includes a third suction unit capable of sucking the target. A fluid ejecting apparatus comprising: the transport device according to claim 1; and a fluid ejecting head capable of ejecting the fluid to the target transported by the transport device. apparatus.

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