JP2007022665A - Ink jet recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink jet recorder capable of suppressing occurrence of meandering of a recording medium to be low even when the conveying speed is dispersed in a plurality of conveying belts. <P>SOLUTION: The ink jet recorder has a recording medium conveying means 3 having a configuration in which a plurality of conveying belts V1-V5 are stretched so that these conveying belts V1-V5 are arranged in the Y-direction orthogonal to the conveying X-direction of a recording medium P with a space between the conveying belts V1-V5, and a recording medium pressing means 5 for pressing the recording medium P to be conveyed by the recording medium conveying means 3 against each outer circumferential surface of the plurality of conveying belts V1-V5. In the predetermined one conveying belt out of the plurality of conveying belts V1-V5, the conveying frictional force which is the frictional force to be applied along the X-direction between the recording medium P and the outer circumferential surfaces of the conveying belts V1-V5 is set to be the maximum conveying frictional force which is larger than the conveying frictional force in other conveying belts V1-V5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ink jet recording apparatus, and more particularly, to an apparatus including a transport apparatus that transports a recording medium placed on a transport belt.

  In recent years, in an ink jet recording apparatus that performs recording on a recording medium by ejecting ink droplets from nozzles, a recording area in which a large number of nozzles are arranged over a length that is greater than the width of the recording medium in order to increase the recording speed. 2. Description of the Related Art An ink jet recording apparatus (hereinafter, referred to as a line type ink jet recording apparatus) including a line type recording head (hereinafter referred to as a line head) having the above has been put into practical use.

  In this line type ink jet recording apparatus, conventionally, a plurality of transport belts for placing and transporting a recording medium are provided, and the transport speeds between the plurality of transport belts are driven by driving the transport belts with the same driving source. There is known a configuration that eliminates the variation of the recording medium and prevents the skew of the recording medium (see, for example, Patent Document 1).

JP-A-8-132700 (page 3, FIG. 6)

However, in order to eliminate the variation in the conveyance speed between the plurality of conveyance belts and prevent the skew of the recording medium, the thicknesses of the plurality of conveyance belts are all the same, and these conveyance belts are only driven by a common drive source. Is not enough. In other words, in order to eliminate variations in the conveyance speed between the conveyance belts, in addition to these, the circumference of the conveyance belt, the outer diameter and the bending of each of the pair of rotation shafts, and the conveyance belt wound around the rotation shafts are wound. The accuracy such as the outer diameter of the pulley to be used must be the same between the conveyor belts.
That is, in the conventional example described in Patent Document 1, the dimensional accuracy of various parts must be extremely high, and the skew of the recording medium can be prevented by eliminating variations in the conveyance speed among a plurality of conveyance belts. There is an unsolved problem that is difficult.

  The present invention has been made paying attention to the above-mentioned unsolved problems, and an ink jet recording apparatus capable of suppressing the occurrence of skew in a recording medium even when there are variations in the conveyance speed of a plurality of conveyance belts. The purpose is to provide.

  According to a first aspect of the present invention, an endless conveyance belt that conveys a recording medium is provided, and recording is performed by ejecting ink droplets from nozzles onto the recording medium that is placed and conveyed on the outer peripheral surface of the conveyance belt. In the inkjet recording apparatus, a plurality of the transport belts are arranged with a gap between the transport belts in a direction perpendicular to the transport direction of the recording medium. A recording medium conveying unit having a stretched configuration; and a recording medium pressing unit that presses the recording medium conveyed by the recording medium conveying unit against each of the outer peripheral surfaces of the plurality of conveying belts, A predetermined one of the plurality of transport belts has a transport friction force that is a friction force acting along the transport direction between the recording medium and the outer peripheral surface of the transport belt. Characterized in that it is set to the maximum transport frictional force greater than the conveying frictional force in belt.

  In the first aspect of the invention, when the recording medium conveying means conveys the recording medium, the conveying frictional force on the other conveying belt is between the predetermined one of the plurality of conveying belts and the recording medium. A large maximum conveying friction force is applied. Therefore, even if the conveyance speeds of the plurality of conveyance belts are different from each other, the conveyance speed of the recording medium is controlled by a predetermined one conveyance belt on which the maximum conveyance friction force acts. That is, when the conveyance speeds of one predetermined conveyance belt and other conveyance belts are different, the recording medium is pulled by the maximum conveyance friction force and slips on the outer peripheral surface of the other conveyance belt. . Thereby, it is possible to suppress the occurrence of skew in the recording medium.

  According to a second invention, in the first invention, the maximum conveying friction force is set to a value larger than a sum of the conveying friction forces in the other conveying belts.

  As a result, the recording medium is pulled without slipping on the outer peripheral surface of the predetermined single conveying belt due to the maximum conveying frictional force, so that the occurrence of skewing of the recording medium can be further suppressed.

  According to a third invention, in the first or second invention, the maximum conveying frictional force is a pressing force by which the recording medium pressing unit presses the recording medium against the outer peripheral surface of the predetermined one conveying belt. It is set by setting it as a value larger than the pressing force in the other conveying belt.

  In the third aspect of the invention, the pressing force of the recording medium pressing unit in the predetermined one conveying belt is set to a value larger than the pressing force in the other conveying belts. As a result, the maximum conveying frictional force can be applied between the predetermined one conveying belt and the recording medium.

  According to a fourth invention, in the first or second invention, the maximum conveying friction force is a coefficient of friction between the recording medium and the outer peripheral surface of the predetermined one conveying belt, and the other conveying It is set by making it a value larger than the said friction coefficient in a belt, It is characterized by the above-mentioned.

  In the fourth aspect of the invention, the friction coefficient between the recording medium and the outer peripheral surface of the predetermined one conveyor belt is set to a value larger than the friction coefficients of the other conveyor belts. As a result, the maximum conveying frictional force can be applied between the predetermined one conveying belt and the recording medium.

  According to a fifth invention, in any one of the first to fourth inventions, the recording medium pressing means is provided on a surface opposite to the mounting surface of the recording medium on the side on which the recording belt is mounted. A contact roller that is rotatably supported by contact is provided, and the recording medium is configured to be pressed against the outer peripheral surface of the transport belt via the contact roller.

  In the fifth aspect of the invention, the recording medium pressing means presses the recording medium against the outer peripheral surface of the transport belt via the contact roller. As a result, the frictional force acting between the recording medium pressing means and the recording medium can be kept low, and the occurrence of skewing of the recording medium due to this frictional force can be kept low.

  According to a sixth invention, in any one of the first to fifth inventions, the predetermined one transport belt is stretched at a position where all the recording media having various recordable sizes can be placed. It is provided.

  As a result, all of the recording media having various sizes that can be recorded can be placed on one predetermined conveyance belt, and the maximum conveyance friction force can be applied to the recording media of the respective sizes. .

  Embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1A, which is a plan view, and FIG. 1B, which is a front view, an inkjet recording apparatus 1 according to an embodiment of the present invention includes a gate roller 2, a paper transport unit 3, and a recording head 4. And a sheet presser 5. In FIGS. 1A and 1B, the X direction indicates the conveyance direction of the recording paper P, and the Y direction indicates a direction orthogonal to the X direction.
The ink jet recording apparatus 1 is a so-called line type ink jet recording apparatus that completes recording without moving the recording head 4 during recording.

Here, the detail of each said structure is demonstrated.
As shown in FIGS. 1A and 1B, the gate roller 2 is disposed on the upstream side in the X direction of a later-described paper transport unit 3, and is a recording surface 6 on which recording paper P is recorded. A pair of rollers configured to rotate while holding the recording paper P in contact with the mounting surface 7 which is the surface opposite to the recording surface 6 are provided. When the gate roller 2 is driven by power from the paper supply motor 21 and is supplied so that the recording paper P is abutted between a pair of rollers in the gate roller 2 by a paper supply unit (not shown), the recording paper P After the skew correction is performed to correct the inclination with respect to the X direction and the positional deviation in the Y direction, the recording paper P is supplied to the paper transport unit 3.

  As shown in FIG. 2A, which is a plan view, and FIG. 2B, which is a front view, the paper transport unit 3 includes a transport unit drive motor 31 that generates power for driving the paper transport unit 3, and A driving roller 32 to which power is transmitted from the conveying unit driving motor 31, a driven roller 33 disposed on the upstream side in the X direction of the driving roller 32, and a conveying belt V <b> 1 stretched between the driving roller 32 and the driven roller 33. ˜V5, and a platen roller 34 which is in contact with the inner peripheral surface of the conveyor belts V1 to V5 and is rotatably supported along with the rotation of each of the conveyor belts V1 to V5.

  As shown in FIG. 2A, the positions of the conveyance belts V1 to V5 in the Y direction are regulated by a flange portion 35 provided on the driving roller 32 and the driven roller 33, and between the conveyance belts V1 to V5. There is a gap. The thickness of the flange portion 35 is set to be smaller than the thickness of the conveying belts V1 to V5 so that the conveyance of the recording paper P is not hindered.

  The platen roller 34 supports a load applied to the conveyor belts V1 to V5 by a sheet presser 5 described later, and suppresses the deflection of the conveyor belts V1 to V5.

  As shown in FIG. 1B, the sheet conveying unit 3 having the above-described configuration is configured such that the driving roller 32 is driven by the conveying unit driving motor 31 so as to rotate the conveying belts V1 to V5 counterclockwise as viewed in this figure. The recording paper P that is driven and supplied from the gate roller 2 onto the outer peripheral surfaces of the conveying belts V1 to V5 is conveyed in the X direction.

  As shown in FIGS. 1A and 1B, the recording head 4 includes head units 4k, 4c, 4m, and 4y that eject ink droplets of black, cyan, magenta, and yellow. The units 4k, 4c, 4m and 4y are arranged in this order from the upstream side in the X direction to the downstream side.

  Here, the arrangement of the nozzles formed in each head unit 4k, 4c, 4m and 4y will be described. The head units 4k, 4c, 4m, and 4y have the same configuration except that the colors of the ejected ink droplets are different. Therefore, here, the nozzle arrangement will be described using the head unit 4k as an example.

  In the head unit 4k, as shown in FIG. 3 which is a bottom view, nozzles 41 for ejecting ink droplets are formed at a predetermined interval in the Y direction over a distance KR. In the ink jet recording apparatus 1, a nozzle row composed of the nozzles 41 arranged over the distance KR is a recordable area in the Y direction.

  In FIG. 3, the size of the nozzle 41 is exaggerated and the number thereof is reduced in order to make the configuration easy to understand. Further, reference numeral 42 in FIG. 3 indicates a nozzle surface on which the nozzles 41 of the head units 4k, 4c, 4m, and 4y are formed.

  As shown in FIGS. 1A and 1B, each head unit 4k, 4c, 4m, and 4y has a nozzle surface 42 facing the recording surface 6 side of the recording paper P on the paper transport unit 3 and the nozzle surface. A nozzle array is disposed across the recording paper P in the Y direction while maintaining a predetermined gap between the recording surface 42 and the recording surface 6. In addition, as these head units 4k, 4c, 4m, and 4y, a head unit that applies pressure to ink by a piezoelectric element, a heating element, or the like and ejects ink droplets can be employed.

  The recording head 4 having the above-described configuration has many recording heads 6 on the recording surface P of the recording paper P conveyed in the X direction by the paper conveying unit 3 based on recording information from a host computer such as a personal computer or a digital still camera. Ink droplets are selectively ejected from the nozzles 41 to perform recording.

  As shown in FIG. 1B, the paper pressing unit 5 includes a paper pressing unit 51 that presses the recording paper P from the recording surface 6 side to the outer peripheral surface of the conveying belts V1 to V5, and the paper pressing unit 51 in this figure. And a support plate 52 that is supported from above.

  As shown in FIG. 4A, which is a front view, and FIG. 4B, which is a side view, the paper pressing unit 51 includes a contact roller 511 whose outer peripheral surface is in contact with the recording surface 6 of the recording paper P, and a contact roller 511. A rotary shaft 512 inserted through the contact roller 511, two bearings 513 that support the rotary shaft 512 and rotatably hold the contact roller 511, and are disposed between the bearing 513 and the support plate 52. And a coil spring 514 for applying a load from the support plate 52 toward the recording paper P.

  In the sheet pressing unit 51 having the above-described configuration, the rotation direction of the contact roller 511 matches the rotation direction of the conveying belts V1 to V5 as shown in FIG. Thus, it is provided for each of the conveyor belts V1 to V5. In FIG. 5, the recording head 4 and the driving roller 32 are omitted for easy understanding of the configuration.

  In addition, as shown in FIG. 1B, the paper pressing unit 51 provided for each of the transport belts V1 to V5 sandwiches each head unit 4k, 4c, 4m, and 4y with two paper pressing units 51 in the X direction. It is arranged. In this embodiment including four head units 4k, 4c, 4m and 4y, the number of sheet pressing units 51 provided for each of the conveyor belts V1 to V5 is five.

  Then, as shown in FIG. 6 which is a bottom view, the sheet pressing unit 5 includes five sheet pressing units 51 arranged along the X direction, and the sheet pressing units 521 to 525 corresponding to the transport belts V1 to V5, respectively. Is configured. As shown in FIG. 1 (b), these sheet pressing portions 521 to 525 apply pressing force to the respective conveying belts V1 to V5 on the recording sheet P which is placed on the outer peripheral surface of the conveying belts V1 to V5 and conveyed. Is granted.

  Further, as shown in FIG. 7, the ink jet recording apparatus 1 includes a control circuit 8 that controls the operation of each configuration described above. The control circuit 8 includes a control unit 81, a paper supply motor driver 82 that controls the paper supply motor 21, a transport unit drive motor driver 83 that controls the transport unit drive motor 31, each head unit 4 k in the recording head 4, A recording head driver 84 that controls 4c, 4m, and 4y and an interface unit 85 that receives recording information such as image data input from a host computer 86 such as a personal computer or a digital still camera are provided.

  The control unit 81 is configured by, for example, a microcomputer, and is necessary when executing CPU (Central Processing Unit) 811 that executes various processes such as recording processes and recording information from the host computer 86 and various processes. And a memory 812 for storing various data. The memory 812 temporarily stores various data when executing SDRAM (Synchronous Dynamic Random Access Memory) that stores recording information, recording processing, and temporarily develops application programs such as recording processing. RAM (Random Access Memory), a ROM (Read-Only Memory) composed of a nonvolatile semiconductor memory for storing a control program executed by the CPU 811, and the like.

  In the inkjet recording apparatus 1 having the above-described configuration, when the control unit 81 receives recording information from the host computer 86 via the interface unit 85, the recording process is started by the CPU 811, and the recording sheet P is gated to a sheet feeding unit (not shown). The recording operation is started by supplying to the roller 2.

  At this time, the conveyance unit drive motor 31 is controlled to be driven by the conveyance unit drive motor driver 83 based on the conveyance unit drive command output from the CPU 811, and the conveyance belts V1 to V5 are viewed counterclockwise as viewed in FIG. The drive is controlled to rotate in the direction.

  The gate roller 2 to which the recording paper P has been supplied is controlled by the paper supply motor driver 82 that has received a paper supply command from the CPU 811 at a predetermined timing to control the drive of the paper supply motor 21 to correct the skew of the recording paper P and then the paper. Supply to the transport unit 3.

  As shown in FIG. 1B, the recording paper P supplied to the paper transport unit 3 is placed on the outer peripheral surface of the transport belts V1 to V5, and each of the transport belts V1 to V5 by the paper pressing units 521 to 525. A pressing force is applied to the. At this time, a conveyance friction force, which is a friction force acting along the X direction, acts between the recording paper P and each of the conveyance belts V1 to V5. With this conveying frictional force, the recording paper P placed on the outer peripheral surface of the conveying belts V1 to V5 can be conveyed in the X direction along with the rotation of the conveying belts V1 to V5.

  When the recording paper P is conveyed in the X direction, each of the head units 4k, 4c, 4m and 4y is controlled by the recording head driver 84 which receives a recording command from the CPU 811 at a predetermined timing, and is conveyed in the X direction. Recording based on the recording information is performed on the recording surface 6 of the recording paper P.

  When recording based on the recording information is completed, the recording paper P is discharged out of the inkjet recording apparatus 1 by a paper discharge unit (not shown).

  By the way, in the inkjet recording apparatus 1 having the above-described configuration, the conveyance speeds of the conveyance belts V1 to V5 may be different depending on the accuracy of the components constituting the sheet conveyance unit 3. If the transport speeds of the transport belts V1 to V5 are different, the recording paper P placed on the transport belts V1 to V5 after skew correction by the gate roller 2 is transported as shown in FIG. Accordingly, a so-called skew is generated that is shifted obliquely.

  The conveyance speed errors of the conveyance belts V1 to V5 include the diameters of the portions where the conveyance belts V1 to V5 of the drive roller 32 and the driven roller 33 are wound, the bending of the drive rollers 32 and the driven rollers 33, and the conveyance belts V1 to V5. Many factors such as circumference and thickness are involved, and it is extremely difficult to make the conveying speeds of all the conveying belts V1 to V5 the same.

  Therefore, in the inkjet recording apparatus 1 of the present embodiment, the conveyance friction force acting on the conveyance belt V3 located at the center in the Y direction among the conveyance belts V1 to V5 is used as the conveyance belts V1, V2, V4, and V5. The maximum conveying friction force that is larger than the sum of the conveying friction forces acting on each of them is set to suppress the occurrence of skew of the recording paper P. In the following, details of the suppression of the skew feeding of the recording paper P will be described.

  The paper pressing unit 523 corresponding to the transport belt V3 is set so that the pressing force for pressing the recording paper P against the transport belt V3 is larger than the sum of the pressing forces of the other paper pressing units 521, 522, 524 and 525. ing. Specifically, the generated load of each coil spring 514 in the five paper pressing units 51 constituting the paper pressing unit 523 is configured to be larger than the generated load of each coil spring 514 in the other paper pressing units 51. ing.

  In the present embodiment, one sheet pressing unit 51 in the sheet pressing unit 523 applies a load of 0.98 N (100 gf) to the recording sheet P, and one sheet pressing unit 521, 522, 524, and 525 has one load. The paper pressing unit 51 is set to apply a load of 0.098 N (10 gf) to the recording paper P.

  That is, the paper pressing unit 523 presses the recording paper P against the conveyance belt V3 with a pressing force of 4.9 N (500 gf), and the other paper pressing units 521, 522, 524, and 525 have a load of 0.49 N, respectively. The recording paper P is pressed against each of the conveying belts V1, V2, V4, and V5 with a pressing force of (50 gf).

  Further, in this embodiment in which the conveyor belts V1 to V5 are made of a rubber material, the value of the friction coefficient in the X direction between the conveyor belts V1 to V5 and the recording paper P is 1. Therefore, the value of the conveyance friction force acting along the X direction between each of the conveyance belts V1, V2, V4, and V5 and the recording paper P is 0.49N. The value of the maximum conveyance friction force acting between the conveyance belt V3 and the recording paper P is the sum of the conveyance friction forces between the other conveyance belts V1, V2, V4, and V5 and the recording paper P. The value is 4.9N, which is larger than 1.96N.

  When the transport speeds of the transport belts V1 to V5 are different, the recording paper P is firmly held on the outer peripheral surface of the transport belt V3 on which the maximum transport friction force acts, and the other transport belts V1, V2, V4, and Slip occurs with the outer peripheral surface of V5. Therefore, even if the conveying speeds of the conveying belts V1 to V5 are different, the occurrence of skew of the recording paper P is suppressed.

  In the present embodiment, the sheet pressing units 521 to 525 correspond to the recording medium pressing unit.

  In the ink jet recording apparatus 1 of the present embodiment, a maximum conveyance friction force larger than the sum of the conveyance friction forces in the other conveyance belts V1, V2, V4, and V5 acts between the conveyance belt V3 and the recording paper P. It has become. As a result, even if the conveying speeds of the conveying belts are different, the recording paper P is held without being displaced on the outer circumferential surface of the conveying belt V3, and on the outer circumferential surfaces of the other conveying belts V1, V2, V4, and V5. Can slide. Therefore, it is possible to suppress the occurrence of skew of the recording paper P.

  In the present embodiment, the pressing force of the paper pressing unit 523 corresponding to the transport belt V3 is made larger than the sum of the pressing forces of the other paper pressing units 521, 522, 524, and 525, and the maximum transport friction force is applied. However, the present invention is not limited to this, and the pressing force of each of the paper pressing portions 521 to 525 is made equal, and the value of the friction coefficient between the transport belt V3 and the recording paper P is set to the other transport belts V1, V2, You may make it make the largest conveyance friction force act by making it larger than the sum of the value of the friction coefficient in V4 and V5.

  In the present embodiment, the sheet pressing unit 51 includes the contact roller 511 having the circular outer shape illustrated in FIG. 9A. However, the present invention is not limited thereto, and as illustrated in FIG. 9B. The spur roller 515 having a plurality of radially extending protrusions may be provided. Thereby, since it is possible to make the projection having a small area rather than the entire outer peripheral surface of the roller come into contact with the recording surface 6 of the recording paper P, it is possible to suppress the contamination of the recording surface 6 on which recording has been completed low. .

  In the present embodiment, the load applied to the transport belts V1 to V5 by the paper pressing unit 51 is supported by the platen roller 34. However, the structure may be supported by a plate-shaped platen.

  Moreover, in this embodiment, although the number of the conveyance belts V1-V5 was five, it is not limited to this, It can be set as two or more arbitrary numbers.

  In the present embodiment, the maximum conveyance friction force is applied to the conveyance belt V3 located at the center in the Y direction among the conveyance belts V1 to V5. Any of the conveyor belts V1 to V5 may be applied.

  Further, when recording is performed on recording papers P of various sizes, as shown in FIGS. 10A to 10C, the Y directions of the recording papers P1, P2, P3 and P4 having these various sizes are used. The maximum conveying frictional force is applied to the conveying belt corresponding to the sheet passing reference position 9 which is the reference position. That is, in the example shown in FIG. 10A, the conveyance belt V3 corresponds to the paper passing reference position 9, and in the example shown in FIG. 10B, the conveyance belt corresponds to the paper passing reference position 9. In the example shown in FIG. 10C, the conveyance belt V1 corresponds to the sheet passing reference position 9.

  With such a configuration, all of the recording papers P1 to P4 of various sizes can be placed on the conveying belt on which the maximum conveying frictional force acts, and the skew occurs in all the recording papers P having different sizes. It becomes possible to suppress.

  In this embodiment, the recording head 4 is configured by the four types of head units 4k, 4c, 4m, and 4y that eject ink droplets of black, cyan, magenta, and yellow. However, the present invention is not limited to this. Instead, it can be composed of arbitrary types such as six types obtained by adding light cyan and light magenta colors to these.

  In the present embodiment, the case where the printable area KR in the Y direction is configured by the head units 4k, 4c, 4m, and 4y that are integrally formed has been described as an example. A plurality of head units may be arranged to form the recordable area KR in the Y direction.

  In this embodiment, the head units 4k, 4c, 4m, and 4y are arranged with the arrangement direction of the nozzles 41 facing the Y direction. However, the present invention is not limited to this, and any head that crosses the X direction. You may make it arrange | position toward this direction. In this case, the nozzle pitch viewed from the X direction can be set short, and the recording resolution in the Y direction can be increased.

  Further, the recording medium is not limited to the recording paper P, and any recording medium can be applied as long as ink droplets can adhere to form dots.

  In this embodiment, the line type ink jet recording apparatus has been described as an example. However, the present invention is not limited to this, and the present invention can also be applied to a serial type ink jet recording apparatus that performs recording while scanning the recording head in the Y direction.

1 is an external view showing a main configuration of an ink jet recording apparatus according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a paper transport unit of the ink jet recording apparatus according to the embodiment of the invention. FIG. 3 is a bottom view of the head unit of the ink jet recording apparatus according to the embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration of a paper pressing unit of the ink jet recording apparatus according to the embodiment of the invention. AA sectional drawing in FIG.1 (b). FIG. 3 is a bottom view of the sheet pressing portion of the ink jet recording apparatus according to the embodiment of the present invention. FIG. 3 is a diagram illustrating a control circuit of the ink jet recording apparatus according to the embodiment of the present invention. FIG. 6 is a diagram for explaining skew feeding of recording paper. FIG. 6 is a diagram illustrating another configuration example of the contact roller of the ink jet recording apparatus according to the embodiment of the present invention. FIG. 3 is a diagram for explaining a sheet passing reference position of the ink jet recording apparatus according to the embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Inkjet recording device, V1, V2, V3, V4, V5 ... Conveying belt, 3 ... Paper conveying part, 5 ... Paper pressing part, 51 ... Paper pressing unit, 511 ... Contact roller, 521,522,523,524 525: Paper pressing portion.

Claims (6)

An ink jet recording apparatus comprising an endless transport belt for transporting a recording medium and performing recording by ejecting ink droplets from nozzles onto the recording medium that is placed on the outer peripheral surface of the transport belt and transported. And
A recording medium having a configuration in which a plurality of the transport belts are stretched so that the plurality of transport belts are arranged in a direction perpendicular to the transport direction of the recording medium with a gap between the transport belts Conveying means;
Recording medium pressing means for pressing the recording medium conveyed by the recording medium conveying means against each of the outer peripheral surfaces of the plurality of conveying belts,
A predetermined one of the plurality of transport belts has a transport friction force that is a friction force acting along the transport direction between the recording medium and the outer peripheral surface of the transport belt. An inkjet recording apparatus, wherein the maximum conveying friction force is set to be greater than the conveying friction force in the conveying belt.   The inkjet recording apparatus according to claim 1, wherein the maximum conveyance friction force is set to a value larger than a sum of the conveyance friction forces in the other conveyance belts.   The maximum conveying frictional force is a value that causes the pressing force of the recording medium pressing unit to press the recording medium against the outer peripheral surface of the predetermined one conveying belt to be larger than the pressing force of the other conveying belt. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is set.   The maximum conveyance friction force is set by setting a friction coefficient between the recording medium and the outer peripheral surface of the predetermined one conveyance belt to a value larger than the friction coefficient in the other conveyance belt. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is provided.   The recording medium pressing means includes an abutting roller rotatably supported in contact with a surface opposite to the mounting surface of the recording medium on the side where the recording medium is mounted. 5. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is configured to be pressed against the outer peripheral surface of the transport belt via the contact roller. 6. The predetermined one conveyor belt is stretched at a position where all of the recording media having various sizes that can be recorded can be placed. 2. An ink jet recording apparatus according to 1.

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