JP2018150099A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress reduction of conveyance accuracy of a medium caused by variation of movement amounts of a conveyance belt.SOLUTION: A printer 1 includes: a ring-shaped conveyance belt 10 which can support a medium P; a drive roller 8 which makes the conveyance belt convey the medium P in a conveyance direction A by rotating the conveyance belt 10; a printing part 7 which prints an image on the medium P; and a control part 31 which carries out control of conveying operation of the medium P. A belt peripheral length L0 as a peripheral length of the conveyance belt 10 is an integral multiple of a first belt movement amount as a movement amount of the conveyance belt 10 when a conveyed amount of the medium P in the conveying operation is maximum.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a printing apparatus.

Conventionally, various printing apparatuses are used. Among these, a printing apparatus that includes a conveyance belt that conveys a medium and prints an image on a medium that is conveyed by the conveyance belt is disclosed. In a printing apparatus including such a conveyance belt that conveys a medium, there is a case where the conveyance accuracy of the medium is reduced due to variations in the amount of movement of the conveyance belt, and the printing position is shifted.
Therefore, for example, in Patent Document 1, the deviation of the transfer position (printing position) is reduced by setting the circumference of the annular recording paper conveyance belt to an integral multiple of the circumference of the roller on which the recording paper conveyance belt is stretched. Is disclosed.

JP-A-5-229687

However, depending on the apparatus configuration, it may be difficult to make the circumference of the conveyor belt an integral multiple of the circumference of the roller on which the conveyor belt is hung.
Further, in a ring-shaped transport belt, there are many cases where a joint portion is included. However, in the state where the joint portion is in contact with the roller and the state where the joint portion is not in contact with the roller, the transport belt There may be a difference (variation) in the amount of movement. The configuration of Patent Document 1 is not configured to suppress variations in the amount of movement of the conveyor belt due to such a reason.

  Therefore, an object of the present invention is to suppress a decrease in medium conveyance accuracy due to variations in the amount of movement of the conveyance belt.

  A printing apparatus according to a first aspect of the present invention for solving the above-described problem includes a ring-shaped conveyance belt that can support a medium, a driving roller that conveys the medium in a conveyance direction by rotating the conveyance belt, A printing unit that prints an image on the medium; and a control unit that controls a conveyance operation of the medium. A belt circumferential length that is a circumferential length of the conveyance belt is a conveyance amount of the medium in the conveyance operation. It is an integral multiple of the first belt movement amount which is the movement amount of the conveyor belt in the maximum case.

  According to this aspect, the belt circumference, which is the circumference of the conveyance belt, is an integral multiple of the first belt movement amount, which is the movement amount of the conveyance belt when the medium conveyance amount in the conveyance operation is maximum. That is, since the belt circumference corresponds to the amount of movement of the conveyance belt, the timing at which a predetermined portion (such as a joint) of the conveyance belt contacts the driving roller can be made periodic. If the timing at which a predetermined portion of the transport belt contacts the drive roller is made periodic, the transport amount of the medium can be corrected by correcting the rotation amount of the drive roller according to the timing. Therefore, it is possible to suppress a decrease in the conveyance accuracy of the medium due to variations in the movement amount of the conveyance belt.

  The printing apparatus according to a second aspect of the present invention is the printing apparatus according to the first aspect, wherein the conveyor belt is stretched over a plurality of rollers including the drive roller, and one end and the other in the circumferential direction are provided. The control unit is configured to determine a conveyance amount of the medium in a contact period in which the connection unit contacts any of the plurality of rollers in the conveyance operation. It is characterized by correcting.

  According to this aspect, the conveyance amount of the medium is corrected in the contact period in which the conveyance belt has the connection portion and the connection portion contacts any of the plurality of rollers. For this reason, the conveyance amount of the medium can be corrected when the variation in the movement amount of the conveyance belt is likely to occur, and the decrease in the conveyance accuracy of the medium due to the variation in the movement amount of the conveyance belt is effectively suppressed. can do.

  The printing device according to a third aspect of the present invention is the printing device according to the second aspect, wherein the control unit moves from a side facing the printing unit to a side not facing the printing unit. The correction value of the transport amount of the medium is made different between the contact period and the contact period when the connecting portion moves from the side not facing the printing unit toward the side facing the printing unit. Features.

  The contact period when the joining portion moves from the side facing the printing portion toward the side not facing the printing portion, and the case where the joining portion moves from the side not facing the printing portion toward the side facing the printing portion The shift amount of the movement amount of the conveyor belt may be different depending on the contact period. According to this aspect, since the correction value of the conveyance amount of the medium is made different in both cases, it is possible to particularly effectively suppress the decrease in the conveyance accuracy of the medium due to the variation in the movement amount of the conveyance belt. .

  The printing apparatus according to a fourth aspect of the present invention is the printing apparatus according to any one of the first to third aspects, wherein the transport belt is stretched over a plurality of rollers including the drive roller, and each of the rollers The distance between them is a distance obtained by dividing the belt circumferential length by an even number, and the belt circumferential length is an even multiple of the first belt movement amount.

  According to this aspect, the conveyor belt is spanned by a plurality of rollers, and the distance between each roller is a distance obtained by dividing the belt circumferential length by an even number, and the belt circumferential length is equal to the first belt movement amount. An even multiple. With such a configuration, the timing at which a predetermined portion (joint or the like) of the conveyor belt contacts the driving roller becomes periodic, so that the medium can be corrected by correcting the rotation amount of the driving roller according to the timing. Can be easily corrected.

  The printing apparatus according to a fifth aspect of the present invention is the printing apparatus according to any one of the first to third aspects, wherein the transport belt is stretched over a plurality of rollers including the drive roller, and each of the rollers The distance between them is a distance obtained by dividing the belt circumferential length by an odd number, and the belt circumferential length is an odd multiple of the first belt movement amount.

  According to this aspect, the conveyor belt is stretched over a plurality of rollers, and the distance between each roller is a distance obtained by dividing the belt circumferential length by an odd number, and the belt circumferential length is the first belt movement amount. It is an odd multiple. With such a configuration, the timing at which a predetermined portion (joint or the like) of the conveyor belt contacts the driving roller becomes periodic, so that the medium can be corrected by correcting the rotation amount of the driving roller according to the timing. Can be easily corrected.

  In the printing apparatus according to a sixth aspect of the present invention, in any one of the first to fifth aspects, the belt circumferential length is an integral multiple of the circumferential length of a half circumference of the drive roller. To do.

  By performing the transport operation using the half circumference of the drive roller as a reference unit, it becomes easy to suppress variations in the amount of movement of the transport belt due to a shift from the center position of the rotation axis of the drive roller. According to this aspect, since the belt circumferential length is an integral multiple of the circumferential length of the half circumference of the driving roller, the timing at which a predetermined portion (such as a joint) of the conveying belt contacts the driving roller becomes periodic, Accordingly, the conveyance amount of the medium can be easily corrected by correcting the rotation amount of the driving roller. Furthermore, at this time, if the position at which the movement amount of the conveying belt relative to the rotation amount of the driving roller is maximum or minimum is set as the rotation start position, even if the rotation axis of the driving roller is deviated from the center position, the conveying roller is conveyed every half circumference. The amount of movement of the belt is always the circumference of the half circumference of the drive roller and can be constant.

  The printing apparatus according to a seventh aspect of the present invention is the printing apparatus according to the sixth aspect, wherein the control unit sets the rotation start position of the drive roller to the rotation amount of the drive roller in the medium conveyance operation. It is characterized in that it is set at a position where the amount of movement is maximum or minimum.

  According to this aspect, in the medium transport operation, the rotation start position of the drive roller is set to a position where the amount of movement of the transport belt relative to the rotation amount of the drive roller is maximized or minimized. When the rotation start position of the driving roller is set to a position where the moving amount of the conveying belt with respect to the rotating amount of the driving roller is maximum or minimum, even if the rotation axis of the driving roller is deviated from the center position, The amount of movement is constant (half the circumference of the drive roller).

  A printing apparatus according to an eighth aspect of the present invention is the printing apparatus according to any one of the first to seventh aspects, further comprising a detection unit that detects a position of the drive roller in the rotation direction, and the control unit performs the transport operation. The rotation angle of the drive roller is set based on the amount of movement of the conveyor belt calculated based on the detection result by the detection unit.

  According to this aspect, in the medium transport operation, the rotation angle of the drive roller is set based on the movement amount of the transport belt calculated based on the detection result by the detection unit. That is, the transport belt is not moved based on the rotation amount of the drive roller, but is moved based on the travel amount of the transport belt calculated based on the detection result by the detection unit. For this reason, even if the rotation axis of the driving roller is deviated from the center position, the conveyance belt can be moved with high accuracy by performing the calculation in consideration of the deviation from the center position of the rotation axis in advance.

  In the printing apparatus according to a ninth aspect of the present invention, in the eighth aspect, the rotation angle of the driving roller corresponding to the position in the rotation direction of the driving roller is related to the amount of movement of the conveyance belt. A storage unit storing the table, wherein the control unit calculates a movement amount of the transport belt with respect to a rotation angle of the drive roller using the table.

  According to this aspect, the movement amount of the conveyance belt with respect to the rotation angle of the driving roller using the table in which the rotation angle of the driving roller and the movement amount of the conveyance belt are associated with the position in the rotation direction of the driving roller. Is calculated. For this reason, the amount of movement of the conveyor belt can be easily calculated.

1 is a schematic side view illustrating a printing apparatus according to a first embodiment of the invention. 1 is a block diagram illustrating a printing apparatus according to a first embodiment of the invention. 1 is a schematic perspective view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic bottom view illustrating a main part of a printing apparatus according to Embodiment 1 of the present invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. 1 is a schematic side view illustrating a main part of a printing apparatus according to a first embodiment of the invention. FIG. 6 is a schematic perspective view illustrating a main part of a printing apparatus according to a second embodiment of the invention.

Hereinafter, an example of a printing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
[Example 1] (FIGS. 1 to 11)
Initially, the outline | summary of the printing apparatus 1 which concerns on Example 1 of this invention is demonstrated.
FIG. 1 is a schematic side view of a printing apparatus 1 according to the present embodiment.

  The printing apparatus 1 of this embodiment includes a feeding unit 2, a transport mechanism 3, a printing mechanism 4, a cleaning mechanism 15, and a winding mechanism 28. The feeding unit 2 can feed out a roll R1 of a medium (print medium) P for printing. The transport mechanism 3 is a mechanism for transporting the medium P in the transport direction A by an adhesive belt 10 (a transport belt constituted by an endless belt) that supports the medium P on the support surface F to which the adhesive is attached. The printing mechanism 4 reciprocates (reciprocates) a carriage 16 including a print head 7 serving as a printing unit that discharges and prints ink in a scanning direction B that intersects the conveyance direction A of the medium P. This is a mechanism that prints an image on the medium P (discharges ink). Further, a cleaning mechanism 15 for the adhesive belt 10 is provided. The take-up mechanism 28 is a mechanism having a take-up shaft 17 that takes up the medium P. “Scanning” means that the carriage 16 is moved in the scanning direction B. For example, during printing, the carriage 16 is moved in the scanning direction B while ejecting ink from the print head 7. It is done.

  As the medium P, a material to be printed can be used. The material to be printed refers to fabrics, clothes, and other clothing products to be printed. The fabric includes woven fabrics, knitted fabrics, non-woven fabrics, etc. of natural fibers such as cotton, hemp, silk, wool, etc., chemical fibers such as nylon, or composite fibers obtained by mixing these. In addition, for clothes and other clothing products, in addition to furniture such as T-shirts, handkerchiefs, scarves, towels, handbags, cloth bags, curtains, sheets, bedspreads, etc., before sewing The existing cloth before and after cutting is also included.

  Further, as the medium P, in addition to the material to be printed, plain paper, high-quality paper, exclusive paper for inkjet printing such as glossy paper, and the like can be used. Further, as the medium P, for example, a plastic film that is not surface-treated for inkjet printing (that is, an ink absorbing layer is not formed), a paper or other base material coated with plastic, and What has a plastic film adhere | attached on base materials, such as paper, can also be used. The plastic is not particularly limited, and examples thereof include polyvinyl chloride, polyethylene terephthalate, polycarbonate, polystyrene, polyurethane, polyethylene, and polypropylene.

  The feeding unit 2 includes a rotating shaft 5 that also serves as a setting position of the roll R1 of the medium P for printing, and transports the medium P from the roll R1 set on the rotating shaft 5 through the driven rollers 6 and 30. It is a configuration that can be extended to. When the medium P is fed out to the transport mechanism 3, the rotating shaft 5 rotates in the rotation direction C.

The transport mechanism 3 includes an adhesive belt 10 that places and transports the medium P fed from the feeding unit 2, a drive roller 8 that moves the adhesive belt 10 in the direction E, and a driven roller 9. . The adhesive belt 10 is hung on the driving roller 8 and the driven roller 9, and in the printing apparatus 1 of this embodiment, the driving roller 8 and the driven roller 9 are positioned horizontally. The cross-linking direction is horizontal. The medium P is stuck and placed by being pressed against the support surface F of the adhesive belt 10 by the pressing roller 12. Note that when the medium P is conveyed, the driving roller 8 rotates in the rotation direction C. A rotation shaft 20 (see FIGS. 5 to 11) of the drive roller 8 has a detection unit 18 (specifically, a position of the drive roller 8 in the rotation direction C and a rotation amount (rotation angle) of the drive roller 8). Is provided with an encoder).
However, the endless belt as the conveying belt is not limited to the adhesive belt. For example, an electrostatic adsorption type endless belt may be used.
Further, a support portion 19 that can support the adhesive belt 10 is provided in a region below the adhesive belt 10 of the present embodiment and facing the pressing roller 12 via the adhesive belt 10. Since the support part 19 supports the adhesive belt 10, it can suppress that the adhesive belt 10 vibrates with moving the adhesive belt 10. FIG.
Further, the pressing roller 12 of the present embodiment can reciprocate (swing) along the transport direction A in order to prevent contact marks from being attached to the medium P by contacting the same place of the medium P for a certain period of time. It has a configuration. However, the pressing roller 12 is not limited to such a configuration.

The printing mechanism 4 includes a carriage moving unit 29 (see FIG. 2) that reciprocates the carriage 16 including the print head 7 in the scanning direction B. In FIG. 1, the scanning direction B is a direction perpendicular to the paper surface.
During printing, printing is performed by reciprocating the carriage 16 including the print head 7, but the conveyance mechanism 3 stops the conveyance of the medium P during printing scanning (while the carriage 16 is moving). In other words, the reciprocating scanning of the carriage 16 and the conveyance of the medium P are alternately performed during printing. That is, at the time of printing, the transport mechanism 3 intermittently transports the medium P (the adhesive belt 10 is intermittently moved) corresponding to the reciprocating scanning of the carriage 16.

  The cleaning mechanism 15 of the adhesive belt 10 includes a cleaning brush 13 configured by connecting a plurality of cleaning rollers in the rotation axis direction, and a tray 14 containing a cleaning agent for cleaning the cleaning brush 13.

The winding mechanism 28 is a mechanism that winds the medium P that has been printed and is transported from the transport mechanism 3 via the driven roller 11. A winding paper tube or the like is set on the winding shaft 17. By winding the medium P, the medium P can be wound as a roll R2.
Note that FIG. 1 shows a state where the surface on which printing is performed uses the outer roll R1, and the surface on which printing is performed is wound outward. For this reason, both the rotating shaft 5 and the winding shaft 17 are rotated in the rotation direction C. However, the printing apparatus 1 according to the present embodiment can use the roll R1 whose inner surface is printed, and can be wound so that the printed surface is on the inner side. That is, both the rotating shaft 5 and the winding shaft 17 can be rotated in the direction opposite to the rotating direction C.

Next, an electrical configuration of the printing apparatus 1 according to the present embodiment will be described.
FIG. 2 is a block diagram of the printing apparatus 1 of the present embodiment.
The control unit 31 is a control unit for controlling the printing apparatus 1. The control unit 31 includes an I / F (interface) 32, a CPU 33, a storage unit 45, and the like.
The I / F 32 is used to transmit / receive data such as print data to / from the PC 46 as an external device. The CPU 33 is an arithmetic processing unit for controlling the entire printing apparatus 1 based on an input signal from the detector group 47 including the detection unit 18 and the like. The storage unit 45 also includes a ROM that stores various control programs executed by the CPU 33, a RAM and an EEPROM for securing an area for storing programs executed by the CPU 33, a work area, and the like.

  The CPU 33 uses the control circuit 44 to drive the driving roller 8 that moves the adhesive belt 10 in the transport direction A, the carriage moving unit 29 that moves the carriage 16 including the print head 7 in the scanning direction B, and printing that discharges ink onto the medium P. The drive of the head 7 and each device (not shown) is controlled.

With this configuration, the control unit 31 according to the present exemplary embodiment forms an image on the medium P by ejecting ink from a later-described ejection range 42 (see FIG. 4) of the print head 7 accompanied with the transport operation of the medium P. It is possible to control the printing operation. The “medium P transport operation” refers to transporting the medium P in the transport direction A by using the transport mechanism 3 between the formation of images on the medium P by the print head 7.
Further, the control unit 31 can calculate the movement amount of the adhesive belt 10 based on the rotation amount of the driving roller 8 detected by the detection unit 18. Specifically, a table in which the rotation angle of the drive roller 8 and the amount of movement of the adhesive belt 10 corresponding to the position in the rotation direction C of the drive roller 8 is stored in the storage unit 45. The controller 31 can calculate the amount of movement of the adhesive belt 10 corresponding to the rotation angle of the drive roller 8 using the table.
The detection unit 18 of the present embodiment is an encoder that can detect the amount of rotation of the drive roller 8, but is not limited to such a configuration. For example, the detector 18 can measure the amount of movement of the adhesive belt 10. Good.

Next, the transport mechanism 3 that is a main part of the printing apparatus 1 according to the present embodiment will be described.
FIG. 3 is a schematic perspective view of the transport mechanism 3 that is a main part of the printing apparatus 1 of the present embodiment.

The transport mechanism 3 of the present embodiment includes a driving roller 8 and a driven roller 9, and an adhesive belt 10 spanned between these rollers.
The adhesive belt 10 is configured to be movable in the direction E when the driving roller 8 rotates in the rotation direction C. Further, the adhesive belt 10 has a connecting portion 26 in which one end portion and the other end portion in the circumferential direction of the adhesive belt 10 are connected to each other, and a ring-shaped endless belt having a belt peripheral length L0. It has become.
In addition, although the adhesive belt 10 of a present Example is provided with the core (reinforcing material) inside like the general conveyance belt, the core is not provided in the connection part 26 (reinforcing material). Therefore, the elongation rate in the belt circumferential length L0 direction is slightly changed in the connecting portion 26 as compared with other portions. For this reason, in the contact period (period from when the connecting portion 26 enters the roller until it is discharged from the roller) during which the connecting portion 26 is in contact with the rollers (the driving roller 8 and the driven roller 9), The tracking of the connecting portion 26 accompanying rotation in the rotation direction C tends to be unstable, and the amount of movement of the adhesive belt 10 in the direction E tends to vary. A resin (polyester, polyamide, aramid, etc.) can be used as the core material. Moreover, you may use a metal as a raw material of a core.

  Here, in the conveyance mechanism 3 of the present embodiment, the adhesive belt 10 is stretched between two rollers (the driving roller 8 and the driven roller 9), and the distance between the driving roller 8 and the driven roller 9 is between the rollers. The distance L3 is a distance obtained by dividing the belt circumferential length L0 by 2. That is, precisely, the inter-roller distance L3 means a distance along the belt circumferential length L0 direction between the urging positions 25 that are positions where the force is most applied to the adhesive belt 10 between the rollers.

Next, the print head 7 that is a main part of the printing apparatus 1 of the present embodiment will be described.
FIG. 4 is a schematic bottom view of the print head 7 which is a main part of the printing apparatus 1 of the present embodiment.

As shown in FIG. 4, the print head 7 according to the present embodiment includes nozzle rows 34 to 41 configured by arranging a plurality of nozzles N along the transport direction A (in a direction intersecting the scanning direction B). Have. The printing apparatus 1 according to the present embodiment is configured to eject cyan ink, magenta ink, yellow ink, and black ink. The nozzle rows 34 and 38 are cyan ink, the nozzle rows 35 and 39 are magenta ink, and the nozzle row. 36 and 40 correspond to yellow ink, and nozzle rows 37 and 41 correspond to black ink.
However, the arrangement of the nozzles N, the types of ink that can be used (the number of nozzle rows), and the like are not limited to the present embodiment.

Here, the discharge range 42 in FIG. 4 represents the discharge range when the discharge range is the maximum (for example, when the same portion of the medium P is printed by one scan of the print head 7 (so-called one pass). Discharge range). Therefore, the discharge length L1 in FIG. 4 represents the maximum discharge length when the discharge range is maximum. The discharge length L1 in FIG. 4 corresponds to the first belt movement amount that is the movement amount of the adhesive belt 10 when the conveyance amount of the medium P in the conveyance operation of the medium P is the maximum.
Note that the printing apparatus 1 according to the present embodiment can perform so-called multi-pass printing in which the same portion of the medium P is printed by being divided into a plurality of scans of the print head 7. When printing in multi-pass, the adhesive belt 10 is intermittently moved by the length obtained by dividing the ejection length L1 in FIG.

Here, as shown in FIG. 1, the printing apparatus 1 according to the present embodiment rotates the adhesive belt 10 in the conveyance direction by rotating the adhesive belt 10 and the ring-shaped adhesive belt 10 that can support the medium P. A drive roller 8 to be conveyed and a print head 7 for printing an image on the medium P are provided. Further, as shown in FIG. 2, a control unit 31 that controls the transport operation of the medium P is provided.
In the printing apparatus 1 of this embodiment, the belt circumferential length L0, which is the circumferential length of the adhesive belt 10, is the amount of movement of the adhesive belt 10 when the conveyance amount of the medium P in the conveyance operation of the medium P is maximum. Is an integral multiple of the first belt movement amount (discharge length L1 in FIG. 4).
With this configuration, the printing apparatus 1 according to the present embodiment has the belt circumferential length L0 and the movement amount of the adhesive belt 10 (the discharge length L1 or the length obtained by dividing the discharge length L1 by the number of passes). Therefore, the timing at which a predetermined portion (for example, the joint 26) of the adhesive belt 10 contacts the driving roller 8 can be made periodic. The timing at which a predetermined portion of the adhesive belt 10 contacts the driving roller 8 is made periodic, and the conveyance amount of the medium P is corrected by correcting the rotation amount of the driving roller 8 according to the timing. Therefore, the printing apparatus 1 according to the present embodiment suppresses a decrease in the conveyance accuracy of the medium P due to variations in the amount of movement of the adhesive belt 10.

Also, as shown in FIG. 3, the adhesive belt 10 of the present embodiment is stretched over a plurality of rollers including the driving roller 8, and one end and the other end in the circumferential direction Are connected to each other.
Then, the control unit 31 corrects the transport amount of the medium P during the contact period in which the connecting unit 26 contacts any one of the plurality of rollers (any one of the driving roller 8 and the driven roller 9) in the transport operation of the medium P. Is configured to do. This will be specifically described below.
In the contact period, the amount of movement of the adhesive belt 10 increases or decreases compared to the non-contact period in which the connecting portion 26 is not in contact with any of the plurality of rollers. How the movement amount of the adhesive belt 10 fluctuates during the contact period can be grasped, for example, by forming a test pattern while the adhesive belt 10 is rotated once. Based on the test pattern formation result, the control unit 31 stores a correction value that cancels out the increase / decrease in the movement amount of the adhesive belt 10 during the contact period. The control unit 31 corrects the transport amount of the medium P during the contact period by performing a transport operation using the stored correction value during the contact period.
As described above, in the contact period, the follow-up of the connecting portion 26 accompanying the rotation of the roller in the rotation direction C is likely to be unstable, and the amount of movement of the adhesive belt 10 in the direction E is likely to vary. The printing apparatus 1 of the present embodiment can correct the transport amount of the medium P during the contact period. For this reason, the printing apparatus 1 of the present embodiment can correct the conveyance amount of the medium P when the variation in the movement amount of the adhesive belt 10 is likely to occur, and the movement of the adhesive belt 10 can be effectively performed. It is possible to suppress a decrease in the conveyance accuracy of the medium P due to the variation in the amount.

  As shown in FIGS. 1 and 3, in the transport mechanism 3 of the present embodiment, the driving roller 8 and the driven roller 9 are positioned horizontally, so that the bridging direction of the adhesive belt 10 is It is horizontal. That is, the adhesive belt 10 moves on the side facing the print head 7 (upper side) on the side from the driven roller 9 side to the drive roller 8 side, and on the side from the drive roller 8 side to the driven roller 9 side. 7 is moved on the side not facing (lower side). In the transport mechanism 3 of this embodiment, in order to hold the medium P firmly on the side facing the print head 7, the side facing the print head 7 is more adhesive than the side not facing the print head 7. The tension accompanying the cross-linking of the belt 10 is increased. As described above, when there is a difference in tension between the side facing the print head 7 and the side not facing the print head 7, the connection portion 26 enters from the side where the tension is strong and the case where the connection portion 26 enters from the side where the tension is weak. There may be a difference in the amount of movement of the adhesive belt 10 during the contact period between the case of entering and an appropriate correction amount may be different. Here, in the transport mechanism 3 of the present embodiment, the side facing the print head 7 is the upper side, and the side not facing the print head 7 is the lower side, so that the tension on the side facing the print head 7 is strong. It is trying to become.

Therefore, the control unit 31 according to the present exemplary embodiment is configured so that the connection unit 26 moves from the side facing the print head 7 toward the side not facing the print head 7 (the connection unit 26 contacts the drive roller 8). Medium) and a contact period when the joint portion 26 moves from the side not facing the print head 7 toward the side facing the print head 7 (when the joint portion 26 contacts the driven roller 9). The correction value of the transport amount can be made different.
In the conveyance mechanism 3 of the present embodiment, the contact period when the connecting portion 26 moves from the side facing the print head 7 toward the side not facing the print head 7 and the side where the connecting portion 26 does not face the print head 7. Since the correction value of the transport amount of the medium P is varied depending on the contact period when moving from the head toward the side facing the print head 7, it is particularly effectively caused by variation in the travel amount of the adhesive belt 10. The configuration is such that a decrease in the conveyance accuracy of the medium P can be suppressed.
Data relating to the correction value of the transport amount of the medium P is stored in the storage unit 45, and the control unit 31 corrects the transport amount of the medium P (control of the rotation amount of the drive roller 8) using the data. . Specifically, the correction value for the contact period (when the connecting portion 26 contacts the driving roller 8) when the connecting portion 26 moves from the side facing the print head 7 toward the side not facing the print head 7 is set. As a first correction value, a correction value for a contact period (when the connecting portion 26 contacts the driven roller 9) when the connecting portion 26 moves from the side not facing the print head 7 toward the side facing the print head 7. Is stored in the storage unit 45 as the second correction value. Then, the control unit 31 uses the first correction value to adjust the transport amount of the medium P during the contact period when the connecting unit 26 moves from the side facing the print head 7 toward the side not facing the print head 7. In the contact period when the connecting portion 26 moves from the side not facing the print head 7 toward the side facing the print head 7, the transport amount of the medium P is corrected using the second correction value.

  Further, as described above, the adhesive belt 10 of this embodiment is stretched over a plurality of rollers including the driving roller 8, and the distance between each roller (inter-roller distance L3) is an even number of the belt circumferential length L0. The belt circumferential length L0 is the first belt movement amount (in FIG. 4) which is the movement amount of the adhesive belt 10 when the conveyance amount of the medium P is the maximum in the conveyance operation of the medium P. It is an even multiple of the discharge length L1). By adopting such a configuration, the transport mechanism 3 of the present embodiment periodically sets the timing at which a predetermined portion (such as the joint 26) of the adhesive belt 10 contacts the driving roller 8, and according to the timing. The conveyance amount of the medium P is easily corrected by correcting the rotation amount of the driving roller 8.

Next, the relationship between the position of the drive roller 8 in the rotation direction C and the rotation amount (rotation angle) of the drive roller 8 and the movement amount of the adhesive belt 10 will be described.
Here, FIG. 5 is a schematic side view showing the driving roller 8 and the adhesive belt 10 in the vicinity of the driving roller 8 which are the main parts of the printing apparatus 1 of the present embodiment, and the rotating shaft 20 of the driving roller 8 is driven. The state which has not shifted | deviated from the center position 23 of the roller 8 is represented. 6 to 9 are schematic side views showing the driving roller 8 as viewed from the same direction as FIG. 5, and the rotation shaft 20 of the driving roller 8 is displaced from the center position 23 of the driving roller 8. Represents a state. 6 to 9 are different in the position of the drive roller 8 in the rotational direction C, FIG. 6 is a state where the rotary shaft 20 is on the lower side in the vertical direction with respect to the center position 23, and FIG. FIG. 8 and FIG. 9 show a state in which the rotary shaft 20 is in a position displaced in the horizontal direction with respect to the central position 23.
5 to 9 are all the first belt movement amount (discharge length in FIG. 4) which is the movement amount of the adhesive belt 10 when the conveyance amount of the medium P is the maximum in the conveyance operation of the medium P. L1) represents an example in which the circumference of the drive roller 8 is a circumference of half a circumference.

As shown in FIG. 5, the rotation shaft 20 of the driving roller 8 is not displaced from the center position 23 of the driving roller 8 in a state where the connecting portion 26 is not in a position that contacts any of the plurality of rollers. In this case, if the rotation angle of the driving roller 8 is constant, the movement amount of the adhesive belt 10 is constant regardless of the rotation angle. For example, when the rotation angle of the drive roller 8 is 180 °, the movement amount of the adhesive belt 10 is 2πr (π is the circumference ratio) regardless of the position of the drive roller 8 in the rotation direction C. , R is the distance from the rotating shaft 20 of the driving roller 8 to the neutral position 24 of the adhesive belt 10).
As shown in FIG. 5, the biasing position 25 (for example, the position farthest from the rotation center of the adhesive belt 10 which is an endless belt) is a linear position 21 in the bridging direction passing through the rotation shaft 20 and This is because it matches 22. With such a configuration, when the rotation angle of the driving roller 8 is 180 °, the movement amount of the adhesive belt 10 (movement amount L2 of the adhesive belt 10 when the driving roller 8 is rotated 180 °). Is always 2πr.
Here, the “neutral position 24 of the adhesive belt 10” means that the portion of the adhesive belt 10 that is hung on the driving roller 8 (the portion where the adhesive belt 10 and the driving roller 8 are in contact) is stretched or contracted. Means no position. In addition, the adhesive belt 10 is displaced in the extending direction outside the neutral position 24 and in the contracting direction inside the neutral position 24.

  On the other hand, as shown in FIGS. 6 to 9, when the rotation shaft 20 of the driving roller 8 is deviated from the center position 23 of the driving roller 8, the driving roller 8 is constant even if the rotation angle of the driving roller 8 is constant. The amount of movement of the adhesive belt 10 is not constant depending on the position in the rotation direction C of 8 and the rotation angle of the driving roller 8. Since the rotation shaft 20 is deviated from the center position 23, even if the rotation angle of the drive roller 8 is constant, the rotation radius of the drive roller 8 is increased in a state where the distance to the biasing position 25 is long, and thus the adhesiveness is increased. This is because the amount of movement of the belt 10 is increased, and in the state where the distance from the rotating shaft 20 to the biasing position 25 is short, the rotation radius of the driving roller 8 is decreased, and thus the amount of movement of the adhesive belt 10 is decreased.

  Here, the discharge length L1 which is the length of the discharge range 42 in the transport direction A is the movement length in the rotation direction C when the drive roller 8 is rotated once (360 ° rotation) (movement of the adhesive belt 10). When the driving roller 8 is rotated once, the amount of movement of the adhesive belt 10 is always constant. Therefore, the amount of movement of the adhesive belt 10 is constant. However, if the discharge length L1 is an integral multiple of the amount of movement of the adhesive belt 10 when the drive roller 8 is rotated once, the size of the print head 7 and the arrangement of the nozzles N can be greatly limited. In order not to impose large restrictions on the size of the print head 7 and the arrangement of the nozzles N, it is desirable that the discharge length L1 can be set to an integral multiple of the amount of movement of the adhesive belt 10 when the drive roller 8 is rotated halfway. .

However, for example, even when the rotation angle of the drive roller 8 is 180 °, the movement amount L2 of the adhesive belt 10 may not be constant depending on the position of the drive roller 8 in the rotation direction C.
For example, in the state shown in FIG. 6, the urging position 25 does not coincide with the linear positions 21 a and 22 a in the bridging direction passing through the rotation shaft 20. When the driving roller 8 is rotated half a turn (turned 180 °) in such a state, as shown in FIG. 7, the portion located at the linear position 21a moves to the position of the linear position 22b, and moves to the linear position 22a. The part which has been located moves to the position of the linear position 21b. For this reason, the movement amount L2 of the adhesive belt 10 is the movement amount L2a shown in FIG.
On the other hand, when the driving roller 8 is further rotated halfway (turned 180 °) from the state shown in FIG. 7, as shown in FIG. 6, the portion located at the linear position 21b reaches the position of the linear position 22a. The part which moved and was located in the linear position 22b moves to the position of the linear position 21a. For this reason, the movement amount L2 of the adhesive belt 10 is the movement amount L2b shown in FIG.
When the movement amount L2a and the movement amount L2b are compared, the movement amount L2a is clearly larger than the movement amount L2b. That is, even if the rotation angle of the driving roller 8 is set to 180 °, the moving amount L2 of the adhesive belt 10 is not constant.

Therefore, the printing apparatus 1 of the present embodiment determines the position of the driving roller 8 in the rotation direction C from the state shown in FIG. 8 and the state shown in FIG. 9 (from the state shown in FIG. 8 to the driving roller 8. In a half-circumferential state) can be used as a reference. In other words, the biasing position 25 can be made to coincide with the linear positions 21c and 22c (linear positions 21d and 22d) in the bridging direction passing through the rotation shaft 20.
When the drive roller 8 is rotated halfway (turned 180 °) in the state shown in FIG. 8, the portion located at the linear position 21c moves to the position of the linear position 22d as shown in FIG. The portion located at the position 22c moves to the position of the linear position 21d. The movement amount L2 of the adhesive belt 10 at this time is the movement amount L2c.
Further, when the drive roller 8 is rotated halfway (turned 180 °) in the state shown in FIG. 9, the portion located at the linear position 21d moves to the position at the linear position 22c as shown in FIG. The portion located at the straight line position 22d moves to the position at the straight line position 21c. At this time, the movement amount L2 of the adhesive belt 10 is the movement amount L2d.
When the movement amount L2c and the movement amount L2d are compared, both the movement amount L2c and the movement amount L2d are half the circumference of the drive roller 8 (half circumference) and are equal. That is, if the rotation angle of the drive roller 8 is 180 °, the movement amount L2 of the adhesive belt 10 becomes constant.

  The position of the driving roller 8 in the rotation direction C is determined by the control unit 31 controlling the driving roller 8 based on the detection result of the detection unit 18, and the positioning of the driving roller 8 in the rotation direction C and the driving roller 8. Rotation takes place. Further, the position of the driving roller 8 shown in FIG. 8 is expressed as a position where the distance from the rotation shaft 20 to the biasing position 25 is the longest and the movement amount of the adhesive belt 10 with respect to the rotation amount of the driving roller 8 is the maximum. it can. 9 can be expressed as a position where the distance from the rotation shaft 20 to the urging position 25 is the shortest and the movement amount of the adhesive belt 10 with respect to the rotation amount of the driving roller 8 is the minimum.

Here, the belt circumferential length L0 of the adhesive belt 10 of the present embodiment is an integral multiple of the circumferential length of the half circumference of the drive roller 8.
The printing apparatus 1 according to the present embodiment has such a configuration, and performs a conveying operation with the half circumference of the driving roller 8 as a reference unit, thereby causing the adhesiveness accompanying the deviation of the driving roller 8 from the center position 23 of the rotating shaft 20. Variation in the amount of movement of the belt 10 is easily suppressed. Since the belt circumferential length L0 of the adhesive belt 10 of this embodiment is an integral multiple of the circumferential length of a half circumference of the driving roller 8, the timing at which a predetermined portion (such as the joint 26) of the adhesive belt 10 contacts the driving roller 8 The amount of conveyance of the medium P is easily corrected by correcting the rotation amount of the driving roller 8 according to the timing. Furthermore, at this time, the rotation shaft 20 of the drive roller 8 is displaced from the center position 23 by setting the position where the movement amount of the adhesive belt 10 relative to the rotation amount of the drive roller 8 is maximum or minimum as the rotation start position. In addition, the movement amount L2 of the adhesive belt 10 for each half circumference of the drive roller 8 is always the circumference of the half circumference of the drive roller 8 and can be made constant.

Here, in the conveyance operation of the medium P, the control unit 31 sets the rotation start position of the drive roller 8 to a position where the movement amount of the adhesive belt 10 with respect to the rotation amount of the drive roller 8 is maximized (corresponding to the state of FIG. 7). ) Or a minimum position (corresponding to the state of FIG. 8).
That is, the printing apparatus 1 according to the present embodiment rotates the driving roller 8 by setting the rotation start position of the driving roller 8 to a position where the movement amount of the adhesive belt 10 with respect to the rotation amount of the driving roller 8 is maximized or minimized. Even if the shaft 20 is deviated from the center position 23, the movement amount L2 of the adhesive belt 10 per half circumference of the drive roller 8 is made constant (half the circumference of the drive roller 8).

In addition, the printing apparatus 1 of the present embodiment can print the same portion of the medium P by one scan of the print head 7 (so-called one pass), and can also print the same portion of the medium P multiple times. It is possible to print by so-called multi-pass printing in which the printing is divided into two scans.
Next, the rotation operation of the drive roller 8 when printing in multi-pass will be described.
10 corresponds to the position in the rotation direction C of the driving roller 8 in FIG. 8, and the movement of the adhesive belt 10 between each pass (rotation of the driving roller 8) when printing in multi-pass (four passes) It is a schematic side view of the drive roller 8 for demonstrating the case where the rotation angle of the drive roller 8 is made constant. Further, FIG. 11 corresponds to FIG. 8 in which the position of the driving roller 8 in the rotation direction C corresponds to FIG. FIG. 6 is a schematic side view of the driving roller 8 for explaining a case in which the amount of movement of the adhesive belt 10 is adjusted to be constant.

  As shown in FIG. 10, when printing is performed in four passes using the printing apparatus 1 of this embodiment, if the rotation angle of the drive roller 8 between each pass is constant (angle Θ), The longer the distance is, the longer the moving distance (moving amount of the adhesive belt 10) in the rotation direction C of the driving roller 8 is. In FIG. 10, the moving distance in the rotation direction C of the drive roller 8 becomes shorter as the moving distance LΘ1, the moving distance LΘ2, the moving distance LΘ3, and the moving distance LΘ4.

  For this reason, when the rotation angle of the driving roller 8 is used as a reference, the amount of movement of the adhesive belt 10 between the passes changes. Therefore, in the printing apparatus 1 of the present embodiment, the adhesive belt 10 between the passes is changed. The control unit 31 adjusts the rotation amount (rotation angle) of the drive roller 8 according to the position in the rotation direction C of the drive roller 8 so that the movement amount becomes constant. FIG. 11 shows that when printing is performed in four passes using the printing apparatus 1 of the present embodiment, the rotation angle of the driving roller 8 between each pass is adjusted to an angle Θa, an angle Θb, an angle Θc, and an angle Θd. This represents a state in which the movement distance of the drive roller 8 in the rotation direction C is all constant at the movement distance L2c / 4 (1/4 of the movement amount L2c).

Specifically, the printing apparatus 1 of this embodiment includes a detection unit 18 that detects the position of the drive roller 8 in the rotation direction C, and the control unit 31 detects the detection result of the detection unit 18 in the transport operation of the medium P. Based on the above, the movement amount of the adhesive belt 10 with respect to the rotation angle of the driving roller 8 corresponding to the position in the rotation direction C of the driving roller 8 is calculated, and the driving is performed based on the calculated movement amount of the adhesive belt 10. The rotation angle of the roller 8 can be set.
That is, the printing apparatus 1 according to the present embodiment does not move the adhesive belt 10 based on the rotation amount of the driving roller 8 but calculates the adhesiveness corresponding to the deviation between the rotation shaft 20 and the center position 23. The adhesive belt 10 can be moved based on the movement amount of the belt 10. For this reason, even if the rotating shaft 20 of the driving roller 8 is deviated from the center position 23, the adhesive belt 10 is moved with high accuracy by performing calculation in consideration of the deviation of the rotating shaft 20 from the center position 23 in advance. Can be made.

  Specifically, the printing apparatus 1 of this embodiment includes the storage unit 45 as described above, and the storage unit 45 has a rotation angle of the driving roller 8 corresponding to the position in the rotation direction C of the driving roller 8. And a table in which the amount of movement of the adhesive belt 10 is related. And the control part 31 can calculate the moving amount | distance of the adhesive belt 10 with respect to the rotation angle of the drive roller 8 using this table. The printing apparatus 1 of the present embodiment is configured to be able to easily calculate the amount of movement of the adhesive belt 10 by using the table in this way.

To explain the above description from another point of view, the printing apparatus 1 according to the present embodiment includes a carriage moving unit 29 as a moving mechanism that reciprocally moves the print head 7 in the scanning direction B intersecting the transport direction A. . Then, the control unit 31 alternately repeats the movement of the print head 7 in the scanning direction B accompanied by the ejection of ink in the printing operation and the movement of the adhesive belt 10 to form an image on the medium P. The length of one pass in the transport direction A (for example, ¼ of the discharge length L1) in the range in which ink is ejected from the print head 7 with one movement (one pass) in the scanning direction B. The amount of movement of the adhesive belt 10 is set to 1 / integer (for example, 1/4 of the amount of movement L2c), and each amount of movement (for example, 1/4 of the amount of movement L2c) associated with one movement of the adhesive belt 10. Can be adjusted for each movement of the adhesive belt 10 such that the rotation amount of the drive roller 8 is one-pass length (for example, 1/4 of the discharge length L1).
As described above, the printing apparatus 1 according to the present exemplary embodiment has a length corresponding to one pass in the transport direction A within a range in which ink is ejected from the print head 7 with one movement of the print head 7 in the scanning direction B. The length is set to 1 / integer of the movement amount L2 of the adhesive belt 10, and each movement amount associated with one movement of the adhesive belt 10 (movement of one intermittent movement) is the length of the one path. Thus, the rotation amount of the driving roller 8 can be adjusted for each movement of the adhesive belt 10. That is, when printing by multi-pass with the so-called serial type printing apparatus 1, the adhesive belt 10 is not moved based on the rotation amount of the driving roller 8 instead of the intermittent movement of the adhesive belt 10 based on the rotation amount of the driving roller 8. The amount of movement can be used as a reference. For this reason, even if the rotating shaft 20 of the driving roller 8 is deviated from the center position 23, the deviation from the center position 23 of the rotating shaft 20 is taken into consideration in advance (for example, information on the deviation is stored in the storage unit 45). For example, even when printing in multi-pass, the adhesive belt 10 can be intermittently moved with high accuracy for each movement. When printing in multi-pass, the movement amount (line feed amount) of the adhesive belt 10 in each pass as a reference may not be uniform between the passes. For example, the line feed amount in the first pass may be smaller than the line feed amount in the second pass. In such a case, it is preferable that the discharge length L1 is changed according to the pass, and the discharge length L1 is an integral multiple of the line feed amount in each pass.

  In this embodiment, since the discharge length L1 is set to be one time the movement amount L2 of the adhesive belt 10 when the drive roller 8 is rotated 180 °, the print head 7 is moved once in the scanning direction B. The length of one pass in the conveyance direction A discharged from the print head 7 accompanying the movement is 1/4 of the discharge length L1, and the amount of movement associated with one movement of the adhesive belt 10 is the movement amount L2c. 1/4. However, the discharge length L1 may be an integer multiple of twice or more the movement amount L2 of the adhesive belt 10. For this reason, for example, when the discharge length L1 is twice the movement amount L2 of the adhesive belt 10, the conveyance direction A discharged from the print head 7 with one movement of the print head 7 in the scanning direction B is provided. In this case, the length of one pass can be 1/8 of the discharge length L1, and the amount of movement associated with one movement of the adhesive belt 10 can be 1/4 of the amount of movement L2c.

[Example 2] (FIG. 12)
Next, the printing apparatus 1 according to the second embodiment will be described in detail with reference to the accompanying drawings.
FIG. 12 is a schematic bottom view of the conveyance mechanism 3 that is a main part of the printing apparatus 1 of the present embodiment, and corresponds to FIG. 3 of the printing apparatus 1 of the first embodiment. In addition, the structural member which is common in the said Example 1 is shown with the same code | symbol, and abbreviate | omits detailed description.
The configuration of the printing apparatus 1 according to the present embodiment is the same as that of the printing apparatus 1 according to the first embodiment except for the conveyance mechanism 3.

As shown in FIG. 12, in the printing apparatus 1 of the present embodiment, the adhesive belt 10 is stretched around a plurality of rollers including the driving roller 8 (the driving roller 8, the driven roller 9, and the driven roller 27). ing.
The distance L3 between the rollers is a distance obtained by dividing the belt circumferential length L0 by 3. Specifically, the distance L3a, the distance L3b, and the distance L3c are all one-third of the belt circumferential length L0. At this time, the belt circumferential length L0 is an odd number of the first belt movement amount (discharge length L1 in FIG. 4) which is the movement amount of the adhesive belt 10 when the conveyance amount of the medium P in the conveyance operation of the medium P is maximum. It has doubled. In summary, the distance L3 between the rollers is a distance obtained by dividing the belt circumferential length L0 by an odd number, and the belt circumferential length L0 is an odd multiple of the first belt movement amount. By adopting such a configuration, the transport mechanism 3 of the present embodiment periodically sets the timing at which a predetermined portion (such as the joint 26) of the adhesive belt 10 contacts the driving roller 8, and according to the timing. The conveyance amount of the medium P is easily corrected by correcting the rotation amount of the driving roller 8.

In addition, this invention is not limited to the said Example, A various deformation | transformation is possible within the range of the invention described in the claim, and it cannot be overemphasized that they are also contained in the scope of the present invention.
For example, in the above embodiment, the belt circumferential length L0 is the first belt movement amount (discharge length in FIG. 4) that is the movement amount of the adhesive belt 10 when the conveyance amount of the medium P in the conveyance operation of the medium P is the maximum. The length L1) is a length corresponding to a half circumference of the drive roller 8. However, the configuration is not limited to this.

DESCRIPTION OF SYMBOLS 1 ... Printing apparatus, 2 ... Feeding part, 3 ... Conveyance mechanism, 4 ... Printing mechanism, 5 ... Rotating shaft,
6 ... driven roller, 7 ... print head (printing unit), 8 ... driving roller, 9 ... driven roller,
10 ... Adhesive belt (conveyor belt), 11 ... Follower roller, 12 ... Pressing roller,
13 ... Cleaning brush, 14 ... Tray, 15 ... Cleaning mechanism, 16 ... Carriage,
17 ... winding shaft, 18 ... detection part, 19 ... support part, 20 ... rotating shaft of drive roller 8,
21 ... Linear position in the bridging direction passing through the rotating shaft 20,
21a to 21d ... linear position in the bridging direction passing through the rotary shaft 20,
22 ... Linear position in the bridging direction passing through the rotary shaft 20,
22a to 22d ... linear position in the bridging direction passing through the rotary shaft 20,
23 ... Center position of the driving roller 8, 24 ... Neutral position, 25 ... Biasing position, 26 ... Connecting portion,
27 ... driven roller, 28 ... winding mechanism, 29 ... carriage moving part,
30 ... driven roller, 31 ... control unit, 32 ... I / F (interface),
33 ... CPU, 34 to 41 ... nozzle row, 42 ... discharge range, 44 ... control circuit,
45 ... Storage unit, 46 ... PC, 47 ... Detector group, F ... Support surface, L0 ... Belt circumference,
L1 ... discharge length,
L2: Movement amount of the adhesive belt 10 when the driving roller 8 is rotated 180 °,
L3: Distance between rollers, N: Nozzle, P: Medium, R1: Roll of medium P,
R2: Roll of medium P

Claims (9)

An annular conveyor belt capable of supporting the medium;
A driving roller for transporting the medium in the transport direction by rotating the transport belt;
A printing unit for printing an image on the medium;
A control unit that controls the transport operation of the medium,
The belt circumference, which is the circumference of the conveyance belt, is an integral multiple of the first belt movement amount, which is the movement amount of the conveyance belt when the conveyance amount of the medium in the conveyance operation is maximum. Printing device. The printing apparatus according to claim 1,
The conveyor belt is stretched over a plurality of rollers including the drive roller, and has a joint part in which one end part and the other end part in the circumferential direction are joined together,
The control unit corrects a conveyance amount of the medium during a contact period in which the joint portion contacts any one of the plurality of rollers in the conveyance operation. The printing apparatus according to claim 2,
The control unit includes the contact period when the connecting unit moves from the side facing the printing unit toward the side not facing the printing unit, and the printing from the side where the connecting unit does not face the printing unit. The printing apparatus is characterized in that a correction value of the conveyance amount of the medium is varied depending on the contact period when moving toward the side facing the part. The printing apparatus according to any one of claims 1 to 3,
The conveyor belt is spanned across a plurality of rollers including the drive roller,
The distance between each of the rollers is a distance obtained by dividing the belt circumference by an even number,
The printing apparatus according to claim 1, wherein the belt circumference is an even multiple of the first belt movement amount. The printing apparatus according to any one of claims 1 to 3,
The conveyor belt is spanned across a plurality of rollers including the drive roller,
The distance between each of the rollers is a distance obtained by dividing the belt circumference by an odd number,
The printing apparatus according to claim 1, wherein the belt circumferential length is an odd multiple of the first belt movement amount. The printing apparatus according to any one of claims 1 to 5,
The printing apparatus according to claim 1, wherein the belt circumference is an integral multiple of a circumference of a half circumference of the drive roller. The printing apparatus according to claim 6.
The control unit sets the rotation start position of the driving roller to a position where the moving amount of the conveying belt with respect to the rotation amount of the driving roller is maximized or minimized in the medium conveying operation. apparatus. The printing apparatus according to any one of claims 1 to 7,
A detection unit for detecting a position of the drive roller in the rotation direction;
The printing apparatus, wherein the control unit sets a rotation angle of the driving roller based on a movement amount of the conveyance belt calculated based on a detection result by the detection unit in the conveyance operation. The printing apparatus according to claim 8,
A storage unit that stores a table in which the rotation angle of the drive roller and the amount of movement of the transport belt correspond to the position in the rotation direction of the drive roller;
The printing apparatus according to claim 1, wherein the control unit calculates a movement amount of the conveyor belt with respect to a rotation angle of the driving roller using the table.

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