JP5970694B2 - Liquid ejector - Google Patents

Description

  The present invention relates to a liquid ejecting apparatus.

  Conventionally, screen printing devices using a dyeing die have been used for printing on cotton, silk, wool, chemical fiber, blended fabric, etc. In recent years, ink jet printing using an ink jet method has been performed due to technological improvements. A textile printing apparatus is attracting attention.

  Ink-jet printing does not require the dye used in screen printing, and a digitized design can be used. Therefore, it is possible to quickly respond to a fine design change according to the customer's request, and to greatly reduce the production time. In addition, there is an advantage that the degree of freedom in design is large, such as being able to express color gradation.

  In an inkjet printing apparatus, when transporting a cloth as a recording medium to an ejection head that performs inkjet printing, in order to increase the transport accuracy, the cloth is affixed to a transport belt having adhesiveness on the surface, The cloth is conveyed by driving the conveyor belt by a belt driving roller or the like. For example, the conveying belt has a configuration in which both ends of one belt are connected in an overlapped state and are formed in an endless shape.

JP 2009-173443 A

  However, in the configuration of the conveyor belt, when the connecting portion of the conveyor belt passes the belt driving roller, the movement amount of the conveying belt when the belt driving roller rotates by a certain amount is shifted due to the step of the connecting portion. There is a case. For this reason, the quality of the image formed on the cloth may be lowered.

  In view of the circumstances as described above, it is an object of the present invention to provide a liquid ejecting apparatus capable of suppressing deterioration in image quality formed on a recording medium.

  The liquid ejecting apparatus according to the present invention is endless in a state in which a belt driving roller that is rotatably provided, a driving unit that rotates the belt driving roller, and a part of the belt-like members are connected to each other at the connection unit. Formed on the belt drive roller, and having a support surface for supporting the recording medium, and supporting the recording medium on the support surface and moving the recording medium in a predetermined transport direction. A conveying belt that conveys the ink to the recording medium, an ejection head that ejects liquid toward the recording medium supported by the conveying belt, and the belt driving roller that rotates intermittently by a predetermined angle with respect to the driving unit. The conveyor belt is moved intermittently, and the connecting portion and the belt drive are moved so that the moving distance of the conveyor belt in each intermittent movement becomes equal to a predetermined distance. And a control unit for adjusting said predetermined angle in accordance with the positional relationship between the rollers.

  According to the present invention, the control unit intermittently moves the belt drive roller by a predetermined angle with respect to the drive unit to intermittently move the conveyance belt, and the movement distance of the conveyance belt in each intermittent movement becomes a predetermined distance. Since the predetermined angle is adjusted according to the positional relationship between the connecting portion and the belt driving roller so as to be equal, even if there is a step in the connecting portion, it is possible to prevent the movement distance of the conveying belt from deviating. As a result, it is possible to suppress a decrease in image quality formed on the recording medium.

In the liquid ejecting apparatus, it is preferable that the predetermined distance is a distance that the recording medium passes through the ejecting head in one intermittent movement.
According to the present invention, since the predetermined distance is a distance through which the recording medium passes through the ejection head in one intermittent movement, it is possible to maintain an intended conveyance distance with respect to the recording medium. As a result, it is possible to suppress a decrease in image quality formed on the recording medium.

In the liquid ejecting apparatus, it is preferable that the control unit adjusts the predetermined angle in one intermittent movement when the distance between the connection unit and the belt driving roller is smaller than the predetermined distance.
According to the present invention, when the distance between the connecting portion and the belt driving roller is smaller than the predetermined distance, the predetermined angle is adjusted in the intermittent movement, so even if there is a step in the connecting portion, the moving distance of the conveying belt is shifted. Can be prevented. As a result, it is possible to suppress a decrease in image quality formed on the recording medium.

In the liquid ejecting apparatus, the control unit may prevent the predetermined angle from being adjusted in one intermittent movement when the distance between the connection unit and the belt driving roller is equal to or greater than the predetermined distance. preferable.
According to the present invention, when the distance between the connecting portion and the belt driving roller is equal to or larger than the predetermined distance, the connecting portion does not reach the belt driving roller in the intermittent movement, so that the expected angle can be obtained without adjusting the predetermined angle. The conveyance accuracy can be maintained.

The liquid ejecting apparatus preferably further includes a storage unit that stores information regarding the adjusted rotation angle.
According to the present invention, information related to the adjusted rotation angle can be stored, so that control based on the information can be performed. Thereby, adjustment of a rotation angle can be performed efficiently.

In the liquid ejecting apparatus, it is preferable that the liquid ejecting apparatus further includes a detection unit that detects a position of the connection unit.
According to the present invention, since the position of the connecting portion can be detected by the detecting portion, the positional relationship between the connecting portion and the belt driving roller can be obtained more accurately.

In the liquid ejecting apparatus, it is preferable that the detection unit detects a position away from the belt driving roller in a direction opposite to the transport direction by the predetermined distance or more.
According to the present invention, since the detection unit detects a position away from the belt driving roller by a predetermined distance or more in the direction opposite to the conveyance direction, detection omission can be prevented.

In the liquid ejecting apparatus, in the case where the connection portion reaches the belt driving roller in the single intermittent movement, the control unit until the connection portion reaches the belt driving roller during the intermittent movement. The first angle corresponding to the thickness of the non-connection portion different from the connection portion of the transport belt is calculated during the interval, and the thickness of the connection portion is determined after the connection portion reaches the belt driving roller. It is preferable that a second angle corresponding to the first angle is calculated, and a sum of the first angle and the second angle is set as the predetermined angle.
According to the present invention, when the connecting portion reaches the belt driving roller in one intermittent movement, the thickness of the non-connecting portion is determined until the connecting portion reaches the belt driving roller during the intermittent movement. Since the first angle is calculated, the second angle corresponding to the thickness of the connecting portion is calculated after the connecting portion reaches the belt drive roller, and the sum of the first angle and the second angle is set as the predetermined angle. Further, it is possible to more reliably prevent the movement distance of the conveyor belt from shifting.

In the liquid ejecting apparatus, in the case where the connection portion is hung from the belt driving roller throughout the intermittent movement, the control unit is configured to determine the thickness of the connection portion during the intermittent movement. It is preferable to adjust the predetermined angle based on the above.
According to the present invention, during a single intermittent movement, when the connection portion is always hung on the belt drive roller, the predetermined angle is adjusted based on the thickness of the connection portion during the intermittent movement. It is possible to prevent the movement distance of the belt from shifting more reliably.

In the liquid ejecting apparatus, in the case where the connection portion is separated from the belt drive roller in one intermittent movement, the control unit is configured to wait until the connection portion is separated from the belt drive roller during the intermittent movement. Calculates the third angle according to the thickness of the connection part, and after the connection part has separated from the belt drive roller, according to the thickness of the non-connection part different from the connection part of the conveyor belt Preferably, a fourth angle is calculated, and a sum of the third angle and the fourth angle is set as the predetermined angle.
According to the present invention, when the connecting portion is separated from the belt driving roller in one intermittent movement, the third angle corresponding to the thickness of the connecting portion is required until the connecting portion is separated from the belt driving roller in the intermittent movement. After the connection portion is separated from the belt drive roller, a fourth angle corresponding to the thickness of the non-connection portion of the transport belt is calculated, and the sum of the third angle and the fourth angle is set as a predetermined angle. Therefore, it is possible to more reliably prevent the movement distance of the conveyor belt from shifting.

The figure which shows the structure of the textile printing apparatus which concerns on embodiment of this invention. The figure which shows the structure of a part of textile printing apparatus which concerns on this embodiment. The figure which shows the mode of operation | movement of the textile printing apparatus which concerns on this embodiment. The figure which shows the mode of operation | movement of the textile printing apparatus which concerns on this embodiment. The graph which shows the mode of detection of the detector which concerns on this embodiment. The figure which shows the mode of operation | movement of the textile printing apparatus which concerns on this embodiment. The figure which shows the mode of operation | movement of the textile printing apparatus which concerns on this embodiment. The figure which shows the mode of operation | movement of the textile printing apparatus which concerns on this embodiment. The figure which shows the mode of operation | movement of the textile printing apparatus which concerns on this embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a textile printing apparatus according to the present embodiment.
As shown in FIG. 1, a textile printing apparatus (liquid ejecting apparatus) 100 includes a recording medium supply unit 10, a recording medium transport unit 20, a recording medium collection unit 30, an inkjet unit 40, a maintenance unit 50, a floating prevention unit 60, and a control unit. CONT. Each part of the textile printing apparatus 100 is attached to the frame part FR.

  The textile printing apparatus 100 prints the recording medium M by forming an image on the recording medium M. As the recording medium M, for example, a cloth such as cotton, silk, wool, chemical fiber, and mixed spinning is used. In the present embodiment, a configuration in which an image is formed on a strip-shaped recording medium M by a roll method will be described as an example. However, the present invention is not limited to this, and other methods (eg, a single wafer type) are performed. It does not matter.

  The recording medium supply unit 10 supplies the recording medium M on which no image is formed. The recording medium supply unit 10 includes a shaft part 11 and a bearing part 12.

  The shaft portion 11 is formed in a cylindrical shape or a columnar shape, and is provided to be rotatable in the circumferential direction. A belt-like recording medium M is wound around the shaft portion 11 in a roll shape. The shaft portion 11 is detachably attached to the bearing portion 12. For this reason, for example, the shaft portion 11 around which the recording medium M is wound can be attached to the bearing portion 12.

  The bearing portion 12 rotatably supports both ends of the shaft portion 11 in the axial direction. The bearing unit 12 has a rotation drive unit (not shown) that drives the shaft unit 11 to rotate. The rotation drive unit rotates the shaft unit 11 in the direction in which the recording medium M is sent out. The operation of the rotation drive unit is controlled by, for example, the control unit CONT.

  The recording medium transport unit 20 transports the recording medium M from the recording medium supply unit 10 to the recording medium collection unit 30. The recording medium transport unit 20 includes a transport roller 21, a transport roller 22, a transport belt 23, a belt rotation roller 24, a belt driving roller 25, a transport roller 26, a drying unit 27, and a transport roller 28.

  The conveyance roller 21 relays the recording medium M between the recording medium supply unit 10 and the conveyance roller 22. The conveyance roller 22 is provided so as to be able to sandwich the recording medium M with the conveyance belt 23, for example. The conveyance roller 22 supports the recording medium M on the conveyance belt 23.

  The conveyor belt 23 is formed in an endless shape, and is hung on a belt rotating roller 24 and a belt driving roller 25. The conveyor belt 23 is held in a state where a predetermined tension is applied so that a portion between the belt rotating roller 24 and the belt driving roller 25 is parallel to the floor surface. An adhesive layer (not shown) that adheres the recording medium M is provided on the surface (support surface 23 a) of the transport belt 23. The conveyance belt 23 supports the recording medium M on the support surface 23a on which the adhesive layer is provided.

  The belt rotation roller 24 and the belt drive roller 25 support the inner peripheral surface 23 b of the transport belt 23. Note that a configuration in which a support portion that supports the conveyance belt 23 is provided between the belt rotation roller 24 and the belt driving roller 25 may be employed. The belt rotation roller 24 rotates as the conveyance belt 23 rotates.

  The conveyance belt 23 is rotated by the rotation of the belt driving roller 25, and the belt rotation roller 24 is rotated by the rotation of the conveyance belt 23. The recording medium M supported by the conveyance belt 23 is conveyed in a predetermined conveyance direction by the rotation of the conveyance belt 23. In the present embodiment, the direction from the belt rotation roller 24 toward the belt drive roller 25 is the transport direction. Therefore, for example, when the belt rotation roller 24 and the belt drive roller 25 are compared, the belt rotation roller 24 is disposed on the upstream side in the transport direction, and the belt drive roller 25 is disposed on the downstream side in the transport direction.

  The transport roller 26 relays the recording medium M transported by the transport belt 23. The drying unit 27 is provided between the transport roller 26 and the transport roller 28 and guides the recording medium M. The conveyance roller 28 relays the recording medium M guided by the drying unit 27 to the recording medium collection unit 30.

  The recording medium collection unit 30 collects the recording medium M conveyed by the recording medium conveyance unit 20. The recording medium recovery unit 30 includes a shaft portion 31 and a bearing portion 32.

  The shaft portion 31 is formed in a cylindrical shape or a columnar shape, and is provided to be rotatable in the circumferential direction. A belt-like recording medium M is wound around the shaft portion 31 in a roll shape. The shaft portion 31 is detachably attached to the bearing portion 32. For this reason, for example, in a state where the recording medium M is wound around the shaft portion 31, the recording medium M can be removed together with the shaft portion 31 by removing the shaft portion 31 from the bearing portion 32.

  The bearing portion 32 rotatably supports both ends of the shaft portion 31 in the axial direction. The bearing portion 32 has a rotation drive unit (not shown) that rotates the shaft portion 31. The rotation drive unit rotates the shaft unit 31 in the direction in which the recording medium M is wound up. The operation of the rotation drive unit is controlled by, for example, the control unit CONT.

  The ink jet unit 40 ejects ink onto the recording medium M. The inkjet unit 40 includes an ejection head H and a head moving unit 41. The ejection head H has an ejection surface Ha that ejects ink. A plurality of nozzles NZ that eject ink are formed on the ejection surface Ha. The ejection surface Ha is directed to the recording medium M that is transported by the transport belt 23. The head moving unit 41 moves the ejection head H in a direction that intersects the transport direction (for example, the width direction of the recording medium M).

  The maintenance unit 50 performs maintenance of the conveyor belt 23. The maintenance unit 50 includes a processing unit 51, a base 52, and a moving unit 53. The processing unit 51 includes, for example, a removing unit that removes foreign matters such as dust and lint attached to the transport belt 23, an adhesive layer repair unit that repairs the adhesive layer when the adhesive layer of the transport belt 23 deteriorates, and the like. A mechanism for performing various types of processing on the conveyor belt 23 is provided. The base 52 supports the processing unit 51. The base 52 may have an elevating unit that moves the processing unit 51 up and down. The moving unit 53 integrally moves the processing unit 51 and the base 52 along the floor surface.

  The floating prevention unit 60 prevents the recording medium M from separating (floating) from the conveyance belt 23. The floating prevention unit 60 is disposed on the upstream side in the transport direction from the ink jet unit 40 (jet head H). The floating prevention unit 60 includes a pressing roller 61 and a roller driving unit 62. The pressing roller 61 is formed in a cylindrical shape or a columnar shape, and is provided to be rotatable in the circumferential direction. The pressing roller 61 is disposed so that, for example, the axial direction intersects the transport direction so as to rotate in a direction along the transport direction. The roller driving unit 62 moves the pressing roller 61 in the transport direction and the second direction opposite to the transport direction.

FIG. 2 is a cross-sectional view illustrating the configuration of the conveyance belt 23, the belt rotation roller 24, and the belt driving roller 25.
As shown in FIG. 2, the transport belt 23 has a connection portion 23 c in which the end portions (the first end portion 71 and the second end portion 72) of the belt-like member 70 are overlapped and connected. In the connection portion 23c, the first end portion 71 and the second end portion 72 are fixed through an adhesive (not shown), for example. Since the first end portion 71 and the second end portion 72 overlap each other, the connection portion 23c is thicker (thickness Th) than the other portion (non-connection portion 23d). Further, when the conveyance belt 23 is viewed in the circumferential direction, a step is formed at the connection portion 23c.

  The belt driving roller 25 rotates in the circumferential direction about the central axis C. The belt drive roller 25 is a cylindrical member having a radius R. A roller drive unit (drive unit) 29 is attached to the belt drive roller 25. The roller driving unit 29 applies a rotational driving force in the circumferential direction to the belt driving roller 25. For example, a motor device or the like is used as the roller driving unit 29.

  The roller drive unit 29 is controlled by the control unit CONT. The control unit CONT includes a data controller 81, a mechanical controller 82, and a motor driver 83. The control unit CONT includes a timer (not shown). The data controller 81 calculates a line feed amount (Lk) of the conveyor belt 23 based on image data input from the outside, and transmits the calculation result to the mechanical controller 82. The line feed amount Lk is a moving distance by which the transport belt 23 moves in the transport direction by a single drive. The line feed amount Lk is the distance that the recording medium M passes through the ejection head.

  On the support surface 23 a of the conveyor belt 23, a detection unit 80 that detects the connection unit 23 c is provided. As the detection unit 80, for example, an optical sensor or the like is used. The detection unit 80 detects a position away from the belt drive roller 25 by a distance Ls in the direction opposite to the conveyance direction. The detection position of the detection unit 80 may be configured to detect a position away from the driving roller 25 by a distance Ls or more in the direction opposite to the conveyance direction. The distance Ls in the direction opposite to the conveyance direction is a distance equal to the line feed amount Lk of the conveyance belt 23.

  The mechanical controller 82 calculates the motor command angle (Δθs) based on the calculation result transmitted from the data controller 81 and the detection result of the detection unit 80. The motor driver 83 controls the roller driving unit 29 so that the belt driving roller 25 rotates by the calculated motor command angle Δθs.

Next, the operation of the textile printing apparatus 100 configured as described above will be described.
When image data is input from the outside to the textile printing apparatus 100, the control unit CONT causes the recording medium M to form an image corresponding to the input image data. First, an operation flow for forming an image on the recording medium M will be described.

  The control part CONT rotates the shaft part 11 and sends out the recording medium M from the recording medium supply part 10. The recording medium M sent out from the recording medium supply unit 10 is supported by the conveyance belt 23 via the conveyance roller 21 and the conveyance roller 22. The controller CONT rotates the belt driving roller 25 to move the transport belt 23 in the transport direction. With this operation, the recording medium M is transported in the transport direction by the transport belt 23.

  After the recording medium M reaches a predetermined position on the transport belt 23, the control unit CONT ejects ink from the nozzles NZ while moving the ejection head H in the width direction of the recording medium M. The control unit CONT moves the recording medium M by a predetermined distance in the transport direction every time the ejection head H scans the recording medium M once in the width direction. The controller CONT rotates the belt driving roller 25 by a predetermined angle in one movement. As described above, the control unit CONT intermittently moves the recording medium M in the transport direction, scans the ejection head H, and ejects ink from the nozzles NZ, thereby forming a predetermined image on the recording medium M. Is done.

  The control unit CONT moves the recording medium M on which an image is formed to the downstream side of the transport belt 23. The recording medium M that has moved to the downstream side of the conveyance belt 23 reaches the recording medium collection unit 30 via the conveyance roller 26, the drying unit 27, and the conveyance roller 28. The control part CONT rotates the shaft part 31 to wind the recording medium M around the shaft part 31. In this way, the recording medium M on which the image is formed is collected.

  In the above operation, for example, as shown in FIG. 3, when the non-connecting portion 23 d is hung on the belt driving roller 25, the portion that receives the rotational force of the belt driving roller 25 is the non-connecting portion 23 d of the transport belt 23. . Accordingly, the support surface 23a of the conveyor belt 23 moves on a cylindrical surface having a radius R1 indicated by the sum of the radius R of the belt driving roller 25 and the thickness Tf of the non-connection portion 23d.

  On the other hand, for example, as shown in FIG. 4, when the connecting portion 23 c is hung on the belt driving roller 25, the portion that receives the rotational force of the belt driving roller 25 is the connecting portion 23 c of the transport belt 23. Accordingly, the support surface 23a of the conveyor belt 23 moves on a cylindrical surface having a radius R2 indicated by the sum of the radius R of the belt driving roller 25 and the thickness Th of the connecting portion 23c.

  Here, since Th> Tf, the distance R2 is larger than the distance R1. Therefore, when the belt driving roller 25 is rotated by a predetermined angle Δθs, the moving distance of the support surface 23a of the conveying belt 23 directly under the ejection head H is larger in the case shown in FIG. 4 than in the case shown in FIG. turn into.

  For this reason, the amount of line feed for the recording medium M is different. For example, a portion where the ink is overlapped in a linear or strip shape is formed on the recording medium M, or a linear or strip portion where the ink is not applied is formed on the recording medium M. As a result, the quality of the image formed on the recording medium M may be degraded.

  On the other hand, in the present embodiment, the control unit CONT intermittently moves the conveyor belt 23 by intermittently rotating the belt driving roller 25 by a predetermined angle with respect to the roller driving unit 29, and each intermittently. The predetermined angle is adjusted according to the positional relationship between the connecting portion 23c and the belt driving roller 25 so that the moving distance of the transport belt 23 in the movement becomes equal to the predetermined distance.

  Specifically, in the above operation, the data controller 81 of the control unit CONT calculates a predetermined distance (Lk) based on the image data and transmits it to the mechanical controller 82. The mechanical controller 82 calculates the motor command angle (Δθs) by the roller drive unit 29 based on the calculated predetermined distance Lk and the detection result by the detection unit 80, and transmits it to the motor driver 83.

FIG. 5 is a graph showing a part of the calculation contents of the mechanical controller 82. The horizontal axis in FIG. 5 indicates time. The vertical axis in FIG. 5 indicates the conveyance speed of the conveyance belt 23 in one intermittent movement.
As shown in FIG. 5, the detection unit 80 outputs the time when the connection unit 23 c is detected in one intermittent movement. The mechanical controller 82 calculates the distance traveled by the connecting portion 23c from the time detected by the detecting portion 80 to the end time of one intermittent movement of the transport belt 23. In this case, as shown in FIG. 5, the area S of the portion after the time detected by the detection unit 80 in the graph indicating the speed of the belt is the movement distance of the connection unit 23c, and the detection position of the detection unit 80 This is the distance from the connecting portion 23c.

The detection position of the detection unit 80 is set to a position away from the belt drive roller 25 by the distance Ls to the upstream side in the transport direction. Therefore, the distance Lt between the connecting portion 23c and the belt driving roller 25 is
Lt = Ls−S
Obtained by. In this way, the positional relationship (distance Lt) between the connecting portion 23c and the belt driving roller 25 is obtained. A storage unit (not shown) can be provided, and the result detected by the detection unit 80 can be stored in the storage unit. Thereby, thereafter, the motor command angle can be adjusted based on the stored information without using the detection unit 80.

  Here, as shown in FIG. 6, when the obtained distance Lt between the connecting portion 23c and the belt driving roller 25 is equal to or greater than a predetermined line feed amount Lk (FIG. 6: a value indicated by the expression (1)), In the next intermittent movement, the connecting portion 23 c does not reach the belt driving roller 25. In this case, the mechanical controller 82 does not correct the motor command angle Δθs during the intermittent movement, and rotates the belt driving roller 25 at a normal motor command angle Δθs (the value shown in FIG. 6: Expression (2)). Let

  Next, as shown in FIG. 7, when the obtained distance Lt between the connecting portion 23c and the belt driving roller 25 is smaller than a predetermined line feed amount Lk, the connecting portion 23c is moved to the belt driving roller 25 in the next intermittent movement. It will come. In this case, the conveyance belt 23 moves over a section 1 from the movement start position to a position reaching the belt driving roller 25 and a section 2 after being hooked on the belt driving roller 25.

  In the section 1, the portion that receives the rotational force of the belt driving roller 25 is the non-connecting portion 23d of the conveyor belt 23. Therefore, the support surface 23a of the conveyor belt 23 moves on a cylindrical surface having a radius R1 (= R + Tf). In section 2, the portion that receives the rotational force of the belt driving roller 25 is the connecting portion 23c of the conveyor belt 23, so the support surface 23a moves on a cylindrical surface having a radius R2 (= R + Th).

  Here, the rotation angle (first angle) of the belt driving roller 25 when the conveyor belt 23 moves in the section 1 is Δθs1, and the rotation angle of the belt driving roller 25 when the conveyor belt 23 moves in the section 2 ( Assuming that the second angle) is Δθs2, the movement distance Lk1 in the section 1 is represented by Expression (3) in FIG. 7, and the movement distance Lk2 in the section 2 is represented by Expression (4) in FIG.

  The mechanical controller 82 obtains the first angle Δθs1 and the second angle Δθs2 based on the above equations (3) and (4), respectively. The mechanical controller 82 obtains the sum of the obtained first angle Δθs1 and second angle Δθs2 as a motor command angle Δθs. As a result, the value shown in the equation (5) in FIG. 7 is obtained. Based on the equation (5), the mechanical controller 82 rotates the belt driving roller 25 with respect to the motor driver 83 using the line feed amount Lk as a constant.

  Next, as shown in FIG. 8, when the connecting portion 23 c is hung from the belt driving roller 25 throughout, the portion that receives the rotational force of the belt driving roller 25 is the connecting portion 23 c of the conveying belt 23. The support surface 23a of 23 moves on the cylindrical surface of radius R2. In this case, the mechanical controller 82 adjusts the motor command angle Δθs so that the support surface 23a of the conveyor belt 23 moves by a predetermined line feed amount Lk on the cylindrical surface having the radius R2.

  At this time, as shown in FIG. 8, the line feed amount Lk is expressed by the equation (6) based on the thickness Th of the connecting portion 23d. Further, the motor command angle Δθs is obtained based on the formula (6) (formula (7)). Based on the equation (7), the mechanical controller 82 rotates the belt driving roller 25 with respect to the motor driver 83 using the line feed amount Lk as a constant.

  Furthermore, as shown in FIG. 9, when the connecting portion 23 c is separated from the belt driving roller 25 in the intermittent movement, the transport belt 23 is connected to the section 3 until the connecting portion 23 c is separated from the belt driving roller 25 and the connecting portion 23 c. Moves over the section 4 after being separated from the belt drive roller 25.

  In the section 3, the portion that receives the rotational force of the belt driving roller 25 is the connecting portion 23c of the conveyor belt 23, so the support surface 23a of the conveyor belt 23 moves on a cylindrical surface having a radius R2 (= R + Th). Further, in section 4, the portion that receives the rotational force of the belt drive roller 25 is the non-connection portion 23d of the conveyor belt 23, so the support surface 23a moves on a cylindrical surface with a radius R1 (= R + Tf).

  Here, the rotation angle (third angle) of the belt driving roller 25 when the conveyor belt 23 moves in the section 3 is Δθs3, and the rotation angle of the belt driving roller 25 when the conveyor belt 23 moves in the section 4 ( When the fourth angle) is Δθs4, the movement distance Lk3 in the section 3 is represented by the equation (8) in FIG. 9, and the movement distance Lk4 in the section 4 is represented by the expression (9) in FIG.

  The mechanical controller 82 obtains the third angle Δθs3 and the fourth angle Δθs4 based on the above equations (8) and (9), respectively. The mechanical controller 82 calculates the sum of the calculated third angle Δθs3 and the fourth angle Δθs4 as the motor command angle Δθs. As a result, the value shown in the equation (10) in FIG. 9 is obtained. Based on the equation (10), the mechanical controller 82 rotates the belt driving roller 25 with respect to the motor driver 83 using the line feed amount Lk as a constant.

  As described above, according to the present embodiment, the control unit CONT intermittently moves the conveyor belt 23 by rotating the belt driving roller 25 intermittently by a predetermined angle with respect to the roller driving unit 29, and each intermittent The predetermined angle is adjusted according to the positional relationship between the connecting portion 23c and the belt driving roller 25 so that the moving distance of the conveying belt 23 in the movement becomes equal to the predetermined distance Lk. The movement distance of the belt 23 can be prevented from shifting. As a result, it is possible to suppress the deterioration of the image quality formed on the recording medium M.

  CONT ... Control part M ... Recording medium H ... Ejecting head 23 ... Conveying belt 23a ... Support surface 23c ... Connecting part 23d ... Non-connecting part 24 ... Belt rotating roller 25 ... Belt driving roller 70 ... Strip member 71 ... First end part 72 ... Second end 80 ... Detector 81 ... Data controller 82 ... Mechanical controller 83 ... Motor driver 100 ... Printing device

Claims (8)

A belt drive roller provided rotatably,
A drive unit for rotating the belt drive roller;
A part of the belt-like member is formed in an endless state in a state of being overlapped and connected at a connection portion, and has a support surface that supports the recording medium that is hung on the belt driving roller, and the recording medium is disposed on the support surface. A conveying belt that conveys the recording medium in the conveying direction by supporting and moving in a predetermined conveying direction;
An ejection head that ejects liquid toward the recording medium supported by the conveyor belt;
The belt driving roller is intermittently rotated by a predetermined angle with respect to the driving unit to move the conveying belt intermittently, and the moving distance of the conveying belt in each intermittent movement is equal to a predetermined distance. A control unit that adjusts the predetermined angle according to a positional relationship between the connection unit and the belt driving roller;
When the connection portion reaches the belt driving roller in one intermittent movement, the control unit performs the conveyance until the connection portion reaches the belt driving roller during the intermittent movement. Calculate a first angle according to the thickness of a non-connection portion different from the connection portion of the belt, and after the connection portion reaches the belt driving roller, a second angle according to the thickness of the connection portion. And the sum of the first angle and the second angle is the predetermined angle,
In the case where the connection portion is always hung on the belt driving roller during one intermittent movement, the control unit determines the predetermined value based on the thickness of the connection portion during the intermittent movement. A liquid ejecting apparatus characterized by adjusting an angle. The liquid ejecting apparatus according to claim 1, wherein the predetermined distance is a distance that the recording medium passes through the ejection head in one intermittent movement. The liquid ejecting according to claim 1, wherein the control unit adjusts the predetermined angle in one intermittent movement when a distance between the connection unit and the belt driving roller is smaller than the predetermined distance. apparatus. The said control part does not adjust the said predetermined angle in one said intermittent movement, when the distance of the said connection part and the said belt drive roller is more than the said predetermined distance. The liquid ejecting apparatus according to any one of the above. The liquid ejecting apparatus according to any one of claims 1 to 4, further comprising a storage unit that stores information on the adjusted rotation angle. The liquid ejecting apparatus according to claim 1, further comprising a detection unit that detects a position of the connection unit. The detection unit detects a position away from the belt driving roller by a predetermined distance or more in a direction opposite to the conveyance direction.
The liquid ejecting apparatus according to claim 6 . When the connecting portion is separated from the belt driving roller in one intermittent movement, the control unit is configured to measure the thickness of the connecting portion during the intermittent movement until the connecting portion is separated from the belt driving roller. And after calculating the third angle according to the thickness of the non-connection portion different from the connection portion of the transport belt after the connection portion is separated from the belt drive roller, The liquid ejecting apparatus according to claim 1, wherein a sum of the third angle and the fourth angle is the predetermined angle.

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