JP2024024203A - liquid discharge device - Google Patents

Abstract

To prevent floating of a medium.SOLUTION: There is provided a liquid discharge device in which a third roller is configured to be movable between a first position in a conveyance direction and a second position downstream of the first position, and configured to be able to move between a first state in which a medium placed on a conveyor belt is pressurized and a second state in which the medium is raised relative to the conveyor belt with the medium wrapped therearound, and when a specified position is a position where the third roller is moved upstream from the second position by at least the amount by which the third roller is raised in the second state, a control unit causes the third roller to stop between the specified position and the first position and then moves the third roller from the first state to the second state, and after the third roller is moved from the second state to the first state, the third roller is moved to the second position.SELECTED DRAWING: Figure 4A

Description

The present invention relates to a liquid ejection device.

Conventionally, as shown in Patent Document 1, a printing unit that prints on a medium, a conveyance belt that supports the medium, a drive roller that conveys the medium in the conveyance direction by rotating the conveyance belt, and a heater are used. a heating pressing section that is movable along the conveying direction while heating the medium and pressing it against the conveying belt; and a control section that controls movement and temperature of the heating pressing section. A printing device equipped with the following is known.

Japanese Patent Application Publication No. 2018-192733

However, the above device has a problem in that the medium cannot be sufficiently heated because the area that the heating press section presses against the medium is narrow.

The liquid ejecting device includes an endless conveyor belt that abuts a first surface of the medium, places the medium thereon, and conveys the medium in the conveyance direction, and a first roller and a second roller over which the conveyance belt is spanned. a conveyance unit including a conveyance unit, and a liquid is discharged onto a second surface of the medium placed on the conveyance belt downstream of the first roller and upstream of the second roller in the circumferential direction of the conveyance belt. a discharging section that feeds out the medium to the transport section; a support section that supports the medium fed out from the feeding section; and a state in which the medium is wound around the medium via the support section; A third roller that supports the medium toward the discharge section side, heats and pressurizes the medium, and a control section, and the third roller is located at the first position in the transport direction and at the first position. a second position downstream of the position; a first state in which the medium placed on the conveyor belt is pressurized; and a state in which the medium is wound around the conveyor belt. a second state in which the third roller rises, and a position where the third roller is moved upstream from the second position by at least the amount by which the third roller rose in the second state is set as a specified position; The control unit is configured to stop the third roller between the specified position and the first position, and then move the third roller from the first state to the second state, and move the third roller from the second state to the second state. After shifting to the first state, the third roller is moved to the second position.

FIG. 1 is a schematic diagram showing the configuration of a liquid ejection device according to a first embodiment. FIG. 1 is a block diagram showing a control configuration of a liquid ejection device according to a first embodiment. FIG. 1 is a schematic diagram showing the configuration of a pressurizing unit according to the first embodiment. FIG. 1 is a schematic diagram showing the configuration of a pressurizing unit according to the first embodiment. FIG. 1 is a schematic diagram showing the configuration of a pressurizing unit according to the first embodiment. FIG. 1 is a schematic diagram showing a method of controlling the liquid ejection device according to the first embodiment. FIG. 1 is a schematic diagram showing a method of controlling the liquid ejection device according to the first embodiment. FIG. 1 is a schematic diagram showing a method of controlling the liquid ejection device according to the first embodiment. FIG. 1 is a schematic diagram showing a method of controlling the liquid ejection device according to the first embodiment. FIG. 7 is a schematic diagram showing a method of controlling a liquid ejection device according to a second embodiment.

1. First Embodiment First, the configuration of the liquid ejection device 100 will be described. The liquid ejection device 100 is an inkjet printer that forms an image or the like on a medium M by ejecting ink as a liquid.

As shown in FIG. 1, the liquid discharging device 100 includes a feeding section 10, a conveying section 20, a discharging section 40, a winding section 30, a drying unit 27, a cleaning unit 50, a brake section 60, a supporting section 70, and a pressurizing unit 80. Equipped with etc. It also has a control section 1 that controls each of these sections. Each part of the liquid ejection device 100 is attached to the frame part 90.
In this embodiment, the direction along the Z-axis is a direction along the gravity, the direction along the X-axis is a direction along the transport direction of the medium M in the discharge section 40, and the direction along the Y-axis is a direction along the direction of gravity. The direction is along the width direction of the medium M. Further, the positional relationship along the conveying direction of the medium M or the circumferential direction (moving direction) of the conveying belt 23 is also referred to as "upstream" and "downstream."

The feeding section 10 supplies the medium M to the discharge section 40 side. As the medium M, for example, fabrics such as cotton, silk, wool, and polyester are used. The feeding section 10 has a supply shaft section 11 and a bearing section 12 . The supply shaft portion 11 is formed in a cylindrical or columnar shape, and is provided so as to be rotatable in the circumferential direction. A band-shaped medium M is wound around the supply shaft portion 11 in the form of a roll. The supply shaft portion 11 is detachably attached to the bearing portion 12 . Thereby, the medium M that has been wound around the supply shaft section 11 in advance can be attached to the bearing section 12 together with the supply shaft section 11 .

The bearing portion 12 rotatably supports both ends of the supply shaft portion 11 in the axial direction. The feeding section 10 has a rotation drive section (not shown) that rotationally drives the supply shaft section 11. The rotation drive unit rotates the supply shaft unit 11 in the direction in which the medium M is sent out. The operation of the rotation drive section is controlled by the control section 1.

The conveyance unit 20 includes a conveyance belt 23, a first roller 24, and a second roller 25. The conveyor belt 23 is formed into an endless belt with both ends connected. The conveyor belt 23 is spanned between a first roller 24 and a second roller 25 arranged downstream of the first roller 24 . In this embodiment, the second roller 25 is a driving roller that is driven, and the first roller 24 is a driven roller that rotates as the conveyor belt 23 rotates.
The conveyor belt 23 is held under a predetermined tension so that the portion between the first roller 24 and the second roller 25 is horizontal. An adhesive 29 for adhering the medium M is applied to the surface (supporting surface) 23a of the conveyor belt 23, and the medium M is attached to the conveyor belt 23 via the adhesive 29.
The medium M supplied from the feeding unit 10 side is pressurized by a pressure unit 80, which will be described later, and the medium M is placed on the conveyor belt 23 with the first surface Ma of the medium M in contact with the conveyor belt 23. be done. Then, the medium M is conveyed in the conveyance direction by rotation of the conveyance belt 23.

It is preferable that the adhesive 29 increases in adhesiveness by being heated. As such an adhesive 29, for example, a hot melt adhesive containing a thermoplastic elastomer SIS as a main component can be used. By heating the adhesive 29 with the pressure unit 80, the medium M can be suitably affixed to the conveyor belt 23.

The first roller 24 and the second roller 25 support the inner peripheral surface 23b of the conveyor belt 23. A contact portion 69 that supports the conveyor belt 23 and a platen 46 are arranged between the first roller 24 and the second roller 25 .
The contact portion 69 is arranged in a region facing the pressure unit 80 via the conveyor belt 23 . The platen 46 is arranged in a region facing the discharge section 40 with the conveyor belt 23 interposed therebetween. Since the contact portion 69 and the platen 46 support the conveyor belt 23, vibration of the conveyor belt 23 due to movement of the conveyor belt 23 can be suppressed.

In this embodiment, the medium M is supported on the side where the surface 23a of the conveyor belt 23 faces the discharge part 40 (+Z-axis side), and the medium M is moved together with the conveyor belt 23 from the first roller 24 side to the second roller 25 side. transported. Further, on the side where the surface 23a of the conveyor belt 23 faces the cleaning unit 50 (-Z axis side), only the conveyor belt 23 moves from the second roller 25 side to the first roller 24 side.

The winding unit 30 collects the medium M transported by the transport unit 20. The winding section 30 has a winding shaft section 31 and a bearing section 32. The winding shaft portion 31 is formed in a cylindrical or columnar shape and is provided so as to be rotatable in the circumferential direction. A strip-shaped medium M is wound around the winding shaft portion 31 in the form of a roll. The winding shaft portion 31 is detachably attached to the bearing portion 32. Thereby, the medium M wound around the winding shaft 31 can be removed together with the winding shaft 31.

The bearing portion 32 rotatably supports both ends of the winding shaft portion 31 in the axial direction. The winding section 30 has a rotation drive section (not shown) that rotationally drives the winding shaft section 31. The rotation drive section rotates the winding shaft section 31 in the direction in which the medium M is wound up. The operation of the rotation drive section is controlled by the control section 1.

A brake section 60 , a support section 70 , and a pressurizing unit 80 are arranged on the conveyance path of the medium M between the feeding section 10 and the conveyance section 20 .
The brake unit 60 includes a brake roller that applies a predetermined tension to the medium M, and a plurality of brake driven rollers that are arranged upstream and downstream of the brake roller in the conveying direction.
The brake unit 60 may include a brake roller moving mechanism (not shown) that moves the position of the brake roller. The brake unit 60 can apply a predetermined tension to the medium M by moving the position of the brake roller using a brake roller moving mechanism under the control of the control unit 1 .
Note that the configurations of the support section 70 and the pressurizing unit 80 will be described later.

Next, the configuration of the discharge section 40 will be explained.
The discharge unit 40 is arranged above (+Z direction) with respect to the conveyor belt 23 and prints on the medium M placed on the surface 23a of the conveyor belt 23. The discharge unit 40 includes a head unit 42, a carriage 43 on which the head unit 42 is mounted, a carriage moving unit 45 that moves the carriage 43 in the width direction of the medium M (direction along the Y axis) that intersects with the transport direction, and the like. . The head unit 42 includes a plurality of ejection heads (not shown) that eject ink as droplets. Ink (for example, yellow, cyan, magenta, black, etc.) is supplied to each ejection head from an ink supply section (not shown). Then, ink is ejected from each ejection head toward the second surface Mb of the medium M, and an image or the like is formed on the medium M.

The carriage moving unit 45 is provided above the conveyor belt 23 (on the +Z-axis side). The carriage moving section 45 includes a pair of guide rails 45a and 45b extending along the Y-axis. The head unit 42 is supported by guide rails 45a and 45b so as to be able to reciprocate along the Y-axis together with the carriage 43.

The carriage moving unit 45 includes a moving mechanism and a power source (not shown). As the moving mechanism, for example, a mechanism combining a ball screw and a ball nut, a linear guide mechanism, etc. can be adopted. Further, the carriage moving unit 45 includes a motor (not shown) as a power source for moving the carriage 43 along the guide rails 45a, 45b. When the motor is driven under the control of the control unit 1, the head unit 42 moves along the Y-axis together with the carriage 43.

The drying unit 27 is arranged between the discharge section 40 and the winding section 30 on the conveyance path of the medium M. The drying unit 27 dries the ink ejected onto the medium M. The drying unit 27 includes, for example, an IR heater, and by driving the IR heater, the ink ejected onto the medium M is dried for a short time. It can be dried. Thereby, the belt-shaped medium M on which an image or the like is formed can be wound around the winding shaft portion 31.

The cleaning unit 50 is disposed below the conveyor belt 23 and between the first roller 24 and the second roller 25 in the direction along the X axis. The cleaning unit 50 includes a cleaning section 51, a pressing section 52, and a moving section 53. The moving unit 53 integrally moves the cleaning unit 50 along the floor surface 99 and fixes it at a predetermined position.

The pressing section 52 is, for example, an elevating device composed of an air cylinder 56 and a ball bush 57, and brings the cleaning section 51 provided at the upper part of the pressing section 52 into contact with the surface 23a of the conveyor belt 23. The cleaning section 51 cleans the surface 23a of the conveyor belt 23 moving from the second roller 25 toward the first roller 24 from below (-Z direction).

The cleaning section 51 includes a cleaning tank 54, a cleaning roller 58, and a blade 55. The cleaning tank 54 is a tank that stores cleaning liquid used for cleaning ink and foreign matter adhering to the surface 23a of the conveyor belt 23, and the cleaning roller 58 and blade 55 are provided inside the cleaning tank 54. As the cleaning liquid, for example, water or a water-soluble solvent (alcohol aqueous solution, etc.) can be used, and a surfactant or an antifoaming agent may be added as necessary.

When the cleaning roller 58 rotates, the cleaning liquid is supplied to the surface 23a of the conveyor belt 23, and the cleaning roller 58 and the conveyor belt 23 slide. As a result, ink and fibers of the medium M adhering to the conveyor belt 23 are removed by the cleaning roller 58.

The blade 55 can be made of a flexible material such as silicone rubber, for example. The blade 55 is arranged downstream of the cleaning roller 58 in the conveyance direction of the conveyance belt 23 . By sliding the conveyor belt 23 and the blade 55, cleaning liquid remaining on the surface 23a of the conveyor belt 23 is removed.

As shown in FIG. 2, the liquid ejection device 100 includes a control unit 1 that controls various operations performed by the liquid ejection device 100. The control unit 1 includes a CPU 2, a memory 3, a control circuit 4, and an I/F (interface) 5. CPU2 is an arithmetic processing unit. The memory 3 is a storage device that secures an area or work area for storing programs for the CPU 2, and includes storage elements such as a RAM and an EEPROM. For example, when the control unit 1 acquires input information from the operation unit 8 or print data etc. from an external device such as an information processing terminal via the I/F 5, the CPU 2 executes calculations according to various programs and controls the control circuit 4. Each drive unit etc. is controlled through the controller. Examples of the information processing terminal include a personal computer (PC) including an input device into which printing conditions and the like are input, a tablet terminal, a portable terminal, and the like.

Next, the configurations of the support section 70 and the pressurizing unit 80 will be explained.
As shown in FIG. 3A, the liquid ejection device 100 includes a support section 70 that supports the medium M fed out from the feeding section 10, and a pressure unit 80.
The support section 70 is disposed downstream of the brake section 60 and supports the medium M conveyed from the feeding section 10 via the brake section 60. The support part 70 of this embodiment is a roller. The arrangement position of the support part 70 is fixed. The medium M conveyed in the +X direction via the brake section 60 is wrapped around the support section 70 and conveyed in the -X direction using the support section 70 as a fulcrum.

The pressure unit 80 includes a third roller 81 that supports the medium M. The third roller 81 is arranged on the -X direction side of the support section 70. Further, the third roller 81 is arranged on the -Z direction side of the support section 70. The third roller 81 supports the medium M conveyed in the -X direction via the support section 70 in a wrapped state. The medium M is wound around about half (half circumference) of the outer peripheral surface of the third roller 81 . The third roller 81 supports the medium M in a state in which the medium M is wound around the third roller 81 so that the medium M is directed toward the discharge section 40 side (+X direction side).

The third roller 81 is configured to be able to heat the medium M. Furthermore, the third roller 81 is configured to be able to press the medium M.
The third roller 81 is arranged so that its axial direction extends in the direction along the Y-axis. The third roller 81 is formed in a cylindrical shape that is longer than the width of the medium M along the Y axis, and is configured to be rotatable in the circumferential direction.
The third roller 81 is made of metal. A heater is arranged inside the third roller 81. The surface of the third roller 81 is heated by the heater. The heater can be constructed of a heating wire made of, for example, an alloy containing nickel and chromium as main components (nichrome), an alloy of iron, chromium, and aluminum, or the like.
Note that the heater disposed on the third roller 81 may be configured to be able to control heating according to the width dimension of the medium M, for example.

The third roller 81 presses the medium M against the conveyor belt 23 by its own weight. At this time, the conveyor belt 23 is heated via the medium M. Since the surface 23a of the conveyor belt 23 is coated with an adhesive 29 whose adhesiveness increases when heated, the medium M can be suitably affixed to the conveyor belt 23.

The third roller 81 is configured to be movable between a first position Pt1 in the conveyance direction and a second position Pt2 downstream of the first position Pt1. That is, the third roller 81 is movable in the direction along the X-axis, and is configured to be able to reciprocate in the first region Rg1 between the first position Pt1 and the second position Pt2. The third roller 81 is configured to be movable, for example, by a ball screw mechanism using a drive source such as a motor. Note that the first position Pt1 and the second position Pt2 are defined based on the axial center of the third roller 81. Since the third roller 81 reciprocates within the first region Rg1 while wrapping the medium M around it, a wide region of the medium M can be sufficiently heated. Moreover, it is possible to suppress the formation of heating marks on the medium M. Furthermore, since the adhesive 29 is heated over a wider range, the adhesion of the medium M to the conveyor belt 23 can be improved.
Note that the contact portion 69 is arranged in a region corresponding to the first region Rg1 in which the third roller 81 is movable. Specifically, the contact portion 69 is arranged in a region facing the third roller 81 in the first region Rg1. Thereby, the medium M, the conveyor belt 23, and the adhesive 29 can be suitably heated and pressurized between the third roller 81 and the contact portion 69.

Further, as shown in FIG. 3B, the third roller 81 is in a first state St1 in which the medium M placed on the conveyor belt 23 is pressed, and in a state in which the third roller 81 is raised relative to the conveyor belt 23 in a state in which the medium M is wound around it. It is configured to be able to shift to the second state St2. The pressure unit 80 includes a lifting mechanism that can move the third roller 81 between the first state St1 and the second state St2. The elevating mechanism includes, for example, an air cylinder and a ball bush. Then, by extending the rod of the elevating mechanism (air cylinder) in the vertical +Z direction, the third roller 81 rises, and the third roller 81 shifts to the second state St2 with the medium M wrapped around it. . On the other hand, in the second state St2, by shortening the rod of the lifting mechanism (air cylinder) in the -Z direction in the vertical direction, the third roller 81 is lowered, and the third roller 81 is in a state where the medium M is wound around it. Transition to the first state St1.
Note that the increase dimension Hd, which is the dimension that increases in order to transition from the first state St1 to the second state St2, is appropriately set according to the thickness of the medium M and the like.
Then, for example, when the discharge section 40 operates, the third roller 81 is shifted to the first state St1, and the medium M and the conveyance belt 23 are heated and pressurized. On the other hand, when the discharge section 40 is stopped, the third roller 81 is shifted to the second state St2. By shifting the third roller 81 to the second state St2, excessive pressure on the medium M and the conveyor belt 23 can be suppressed. That is, it is possible to suppress the impressions on the medium M due to the heating and pressurization of the third roller 81 and the impressions on the conveyor belt 23, and to suppress the occurrence of banding (streaky) in the image of the medium M.

Here, as shown in FIG. 3B, since the medium M is wrapped around the third roller 81, when the third roller 81 is raised to shift to the second state St2, the third roller 81 is raised. A part of the medium M also rises accordingly. That is, a portion of the medium M is peeled off from the conveyor belt 23 as the third roller 81 rises.
Next, as shown in FIG. 3C, when the third roller 81 is lowered to shift to the first state St1, the peeled part of the medium M also lowers as the third roller 81 lowers. At this time, not all of the peeled part of the medium M comes into contact with the conveyor belt 23, and a floating portion Cv of the medium M may occur on the +X direction side of the lower end of the third roller 81. In addition, since the third roller 81 of this embodiment is made of metal, its elastic force is low, and when it is shifted to the first state St1, it is difficult to crush the floating portion Cv. Note that even if the third roller 81 is made of an elastic body, a similar floating portion Cv may occur.
For example, if the floating portion Cv of the medium M is conveyed downstream without being crushed, the floating portion Cv collides with the head unit 42 (ejection head) arranged downstream in the conveyance direction, damaging the ejection head. There is a risk that the product may become damaged.

Therefore, in the liquid ejection device 100 of the present embodiment, when the specified position Ptr is a position moved upstream from the second position Pt2 by at least the rising dimension Hd of the third roller 81 in the second state St2, the control The unit 1 moves the third roller 81 from the second state St2 to the second state St2 after stopping the third roller 81 between the specified position Ptr and the first position Pt1, and moves the third roller 81 from the second state St2 to the first state St2. After shifting to the state St1, the third roller 81 is moved to the second position Pt2. Note that the specified position Ptr is specified based on the axial center of the third roller 81.

Specifically, as shown in FIG. 4A, the transition of the third roller 81 from the first state St1 to the second state St2, or the transition of the third roller 81 from the second state St2 to the first state St1, is as follows: It is executed within the second region Rg2.
The second region Rg2 is narrower than the first region Rg1. The specified position Ptr is a position shifted upstream (toward the first position Pt1) from the second position Pt2 by the rising dimension Hd. That is, the second region Rg2 is the value obtained by subtracting the rising dimension Hd from the first region Rg1. The prescribed position Ptr is the downstream end in the second region Rg2. The second position Pt2 is located downstream of the specified position Ptr.

As shown in FIG. 4A, for example, when the discharge unit 40 stops, the control unit 1 stops the third roller 81 in the second region Rg2, and then moves the third roller 81 from the first state St1 to the second state St1. The state is shifted to St2. In this embodiment, a case will be described in which the third roller 81 is operated at a prescribed position Ptr (downstream end in the second region Rg2).
By shifting the third roller 81 to the second state St2, the third roller 81 rises by the rising dimension Hd, so that it is possible to suppress the occurrence of impressions on the conveyor belt 23 due to the pressure applied by the third roller 81. Further, when the third roller 81 is shifted to the second state St2, since the medium M is wrapped around the third roller 81, a part of the medium M is transferred to the conveyor belt 2 as the third roller 81 rises. peels off from

Next, as shown in FIG. 4B, for example, when the discharge section 40 operates, the control section 1 shifts the third roller 81 from the second state St2 to the first state St1. When the third roller 81 is shifted to the first state St1, the peeled part of the medium M also descends as the third roller 81 descends. At this time, not all of the peeled part of the medium M comes into contact with the conveyor belt 23, and a floating portion Cv of the medium M is generated on the +X direction side of the lower end of the third roller 81.

Next, as shown in FIG. 4C, the control unit 1 moves the third roller 81 to the second position Pt2 in the first state St1. That is, the third roller 81 has a movement area that is at least equal to the rising dimension Hd, and can move to the second position Pt2 while pressing the medium M with the third roller 81. Then, in the process of the third roller 81 moving to the second position Pt2, the floating portion Cv of the medium M is crushed by the pressure applied by the third roller 81, and the entire medium M is brought into contact with the conveyor belt 23.

Next, as shown in FIG. 4D, the control unit 1 reciprocates the third roller 81 in the direction along the X axis in the second region Rg2 between the first position Pt1 and the specified position Ptr in the first state St1. let That is, when the third roller 81 shifts from the second state St2 to the first state St1, the control unit 1 moves the third roller 81 to the second position Pt2, and thereafter moves the third roller 81 to the second state St1. It is moved back and forth in area Rg2.
Thereafter, operations similar to those described above are repeated.

As described above, according to the present embodiment, even if the floating portion Cv of the medium M occurs when the third roller 81 is moved from the second state St2 to the first state St1, the third roller 81 is moved to the second position Pt2. By moving the floating portion Cv, the floating portion Cv can be crushed. Thereby, collision between the ejection head of the ejection unit 40 and the medium M can be suppressed.

2. Second Embodiment Next, a second embodiment will be described. Note that the same configurations as in the first embodiment are given the same reference numerals and redundant explanations will be omitted.
In this embodiment, the control unit 1 corrects the specified position Ptr based on the correction value Aj. Then, after stopping the third roller 81 between the corrected specified position Ptr and the first position Pt1, the control unit 1 moves the third roller 81 from the first state St1 to the second state St2, and moves the third roller 81 to the second state St2. After shifting from the second state St2 to the first state St1, the third roller 81 is moved to the second position Pt2.

Specifically, as shown in FIG. 5, the transition of the third roller 81 from the first state St1 to the second state St2, or the transition of the third roller 81 from the second state St2 to the first state St1, is as follows. The process is executed within the second region Rg2 in which the rising dimension Hd and the correction value Aj are taken into account.
The specified position Ptr is a position shifted upstream (towards the first position Pt1) from the second position Pt2 by the sum of the rising dimension Hd and the correction value Aj. That is, the second region Rg2 of this embodiment is a value obtained by subtracting the rising dimension Hd and the correction value Aj from the first region Rg1. The prescribed position Ptr is the downstream end in the second region Rg2. The second position Pt2 is located downstream of the specified position Ptr.

The correction value Aj of this embodiment is set according to the form of the medium M. The correction value Aj is set depending on the contractility of the medium M, for example. Specifically, the medium M (for example, cotton) that is relatively hard and has low shrinkage tends to peel off from the conveyor belt 23 when the third roller 81 is moved to the second state St2. Therefore, the correction value Aj is set larger. On the other hand, the relatively soft and highly contractible medium M (for example, polyester) is difficult to peel off from the conveyor belt 23 when the third roller 81 is moved to the second state St2. Therefore, the correction value Aj is set smaller.

Correction values Aj corresponding to various media M are stored in the memory 3, for example. The operation unit 8 includes an input unit, a display unit, etc., and the user inputs the target medium M from the menu screen. Based on the input medium M, the control unit 1 sets a correction value Aj corresponding to the medium M. Next, the control unit 1 sets the prescribed position Ptr based on the correction value Aj. Thereby, the second region Rg2 is set.

Here, the correction value Aj of the medium M with relatively low shrinkage is larger than that of the medium M with relatively high shrinkage. Therefore, the dimensional distance between the specified position Ptr and the second position Pt2 becomes longer. That is, a longer movement area of the third roller 81 toward the second position Pt2 is secured. Therefore, for example, when a relatively low shrinkage medium M is used and the third roller 81 is moved to the second state St2, a larger amount of the medium M is peeled off from the conveyor belt 23, and the floating portion Cv of the medium M is There is also a risk that a larger amount will occur. However, after the third roller 81 is shifted to the first state St1, the distance for moving the third roller 81 to the second position Pt2 is secured longer, so the third roller 81 moves to the second position Pt2. In the process, the floating portion Cv of the medium M is crushed by the pressure applied by the third roller 81, and the entire medium M is brought into contact with the conveyor belt 23.

As described above, according to the present embodiment, the prescribed position Ptr is corrected according to the form of the medium M. Thereby, after the transition from the second state St2 to the first state St1, the distance dimension for moving the third roller 81 to the second position Pt2 is appropriately secured, and the floating portion Cv of the medium M can be reliably crushed. .

3. Third Embodiment Next, a third embodiment will be described. Note that the same configurations as those in the first and second embodiments are given the same reference numerals and redundant explanations will be omitted.
The control unit 1 corrects the specified position Ptr based on the correction value Aj. The correction value Aj of this embodiment is set according to the cleaning state of the conveyor belt 23. Then, after stopping the third roller 81 between the corrected specified position Ptr and the first position Pt1, the control unit 1 moves the third roller 81 from the first state St1 to the second state St2, and moves the third roller 81 to the second state St2. After shifting from the second state St2 to the first state St1, the third roller 81 is moved to the second position Pt2.

The correction value Aj is set, for example, according to the cumulative cleaning time during which the conveyor belt 23 is cleaned by the cleaning unit 50. The longer the cumulative cleaning time is, the lower the durability of the adhesive 29 becomes. Therefore, the longer the cumulative cleaning time is, the more likely the medium M will be peeled off from the conveyor belt 23 when the third roller 81 is moved to the second state St2. Therefore, the longer the cumulative cleaning time is, the larger the correction value Aj is set.

The cleaning time of the conveyor belt 23 is measured by a time measuring device, and the measured time information is stored in the memory 3 via the I/F 5. The CPU 2 calculates the cumulative time using the stored time information and stores the calculation result in the memory 3. The control unit 1 reads the accumulated time and sets a correction value Aj according to the accumulated time.
Alternatively, a threshold value may be provided for the cumulative time, and the correction value Aj may be set for each stage.
Note that, for example, when maintenance of the adhesive 29 is performed, the accumulated time is reset and new time measurement is started.

Here, the longer the cumulative cleaning time of the conveyor belt 23, the larger the correction value Aj becomes. Therefore, the dimensional distance between the specified position Ptr and the second position Pt2 becomes longer. That is, a longer movement area of the third roller 81 toward the second position Pt2 is secured. Therefore, when the cumulative time becomes longer, when the third roller 81 is moved to the second state St2, there is a possibility that the medium M will be peeled off from the conveyor belt 23 to a greater extent, and the floating portion Cv of the medium M may also be larger. However, after the third roller 81 is shifted to the first state St1, the distance for moving the third roller 81 to the second position Pt2 is secured longer, so the third roller 81 moves to the second position Pt2. In the process, the floating portion Cv of the medium M is crushed by the pressure applied by the third roller 81, and the entire medium M is brought into contact with the conveyor belt 23.

As described above, according to the present embodiment, the specified position Ptr is corrected according to the cleaning state of the conveyor belt 23 (for example, the cumulative cleaning time). Thereby, after the transition from the second state St2 to the first state St1, the distance dimension for moving the third roller 81 to the second position Pt2 is appropriately secured, and the floating portion Cv of the medium M can be reliably crushed. .
Note that the setting of the correction value Aj is not limited to the cumulative cleaning time. For example, the correction value Aj may be set according to the cumulative distance of the conveyor belt 23 after cleaning the conveyor belt 23. Note that the cumulative distance (traveling distance) of the conveyor belt 23 can be calculated by the control unit 1 by, for example, installing a rotary encoder or the like in the rotation drive unit of the second roller 25. Even in this case, the same effect as described above can be obtained.

4. Fourth Embodiment Next, a fourth embodiment will be described. Note that the same configurations as those in the first and second embodiments are given the same reference numerals and redundant explanations will be omitted.
The control unit 1 corrects the specified position Ptr based on the correction value Aj. The correction value Aj of this embodiment is set according to the usage state of the conveyor belt 23. Then, after stopping the third roller 81 between the corrected specified position Ptr and the first position Pt1, the control unit 1 moves the third roller 81 from the first state St1 to the second state St2, and moves the third roller 81 to the second state St2. After shifting from the second state St2 to the first state St1, the third roller 81 is moved to the second position Pt2.

The correction value Aj is set, for example, according to the cumulative usage time of the conveyor belt 23. As the cumulative usage time increases, the durability of the adhesive 29 decreases. Therefore, as the cumulative usage time increases, the medium M is more likely to peel off from the conveyor belt 23 when the third roller 81 is shifted to the second state St2. Therefore, the longer the usage time of the conveyor belt 23, the larger the correction value Aj is set.

The usage time of the conveyor belt 23 is measured by a time measuring device, and the measured time information is stored in the memory 3 via the I/F 5. The CPU 2 calculates the cumulative time using the stored time information and stores the calculation result in the memory 3. The control unit 1 reads the accumulated time and sets a correction value Aj according to the accumulated time.
Alternatively, a threshold value may be provided for the cumulative time, and the correction value Aj may be set for each stage.
Note that, for example, when the conveyor belt 23 is replaced, the accumulated time is reset and new time measurement is started.

Here, the longer the cumulative usage time of the conveyor belt 23, the larger the correction value Aj becomes. Therefore, the dimensional distance between the specified position Ptr and the second position Pt2 becomes longer. That is, a longer movement area of the third roller 81 toward the second position Pt2 is secured. Therefore, when the cumulative time becomes longer, when the third roller 81 is moved to the second state St2, there is a possibility that the medium M will be peeled off from the conveyor belt 23 to a greater extent, and the floating portion Cv of the medium M may also be larger. However, after the third roller 81 is shifted to the first state St1, the distance for moving the third roller 81 to the second position Pt2 is secured longer, so the third roller 81 moves to the second position Pt2. In the process, the floating portion Cv of the medium M is crushed by the pressure applied by the third roller 81, and the entire medium M is brought into contact with the conveyor belt 23.

As described above, according to the present embodiment, the specified position Ptr is corrected according to the usage state of the conveyor belt 23 (for example, the cumulative usage time). Thereby, after the transition from the second state St2 to the first state St1, the distance dimension for moving the third roller 81 to the second position Pt2 is appropriately secured, and the floating portion Cv of the medium M can be reliably crushed. .

DESCRIPTION OF SYMBOLS 1... Control part, 2... CPU, 3... Memory, 4... Control circuit, 5... I/F, 8... Operation part, 10... Feeding part, 11... Supply shaft part, 12... Bearing part, 20... Conveyance part, 23... Conveyance belt, 23a... Surface, 23b... Inner peripheral surface, 24... First roller, 25... Second roller, 27... Drying unit, 29... Adhesive, 30... Winding part, 31... Winding shaft part, 32... Bearing part, 40... Discharge part, 42... Head unit, 43... Carriage, 45... Carriage moving part, 45a, 45b... Guide rail, 46... Platen, 50... Cleaning unit, 51... Cleaning part, 52... Pressing part , 53... Moving part, 54... Cleaning tank, 55... Blade, 56... Air cylinder, 57... Ball bush, 58... Washing roller, 60... Brake part, 69... Contact part, 70... Support part, 80... Pressure Unit, 81...Third roller, 90...Frame part, 99...Floor surface, 100...Liquid discharge device, M...Medium, Ma...First surface, Mb...Second surface, Pt1...First position, Pt2...Second Position, St1...first state, St2...second state, Hd...rise dimension, Rg1...first region, Rg2...second region, Aj...correction value.

Claims (5)

a conveyance unit including an endless conveyance belt that places the medium in contact with a first surface of the medium and conveys the medium in the conveyance direction; and a first roller and a second roller over which the conveyance belt spans;
a discharge unit that discharges a liquid onto a second surface of the medium placed on the conveyor belt downstream of the first roller and upstream of the second roller in the circumferential direction of the conveyor belt;
a feeding unit feeding out the medium to the conveyance unit;
a support part that supports the medium fed out from the feeding part;
a third roller that supports the medium toward the discharge section in a state in which the medium is wound around the support section, and heats and presses the medium;
comprising a control unit;
The third roller is
configured to be movable between a first position in the transport direction and a second position downstream of the first position,
configured to be able to shift between a first state in which the medium placed on the conveyor belt is pressurized and a second state in which the medium is raised relative to the conveyor belt with the medium wrapped around it;
When the prescribed position is a position where the third roller is moved upstream from the second position by at least the amount by which the third roller is raised in the second state, the control unit:
After stopping the third roller between the specified position and the first position, transitioning from the first state to the second state,
A liquid ejecting device that moves the third roller to the second position after shifting the third roller from the second state to the first state. The liquid ejection device according to claim 1,
The control unit includes:
A liquid ejecting device that corrects the specified position based on a correction value. The liquid ejection device according to claim 2,
In the liquid ejecting device, the correction value is set according to the form of the medium. The liquid ejection device according to claim 2,
comprising a cleaning unit that cleans the conveyor belt,
In the liquid ejecting device, the correction value is set according to a cleaning state of the conveyor belt. The liquid ejection device according to claim 2,
In the liquid ejecting device, the correction value is set depending on the usage state of the conveyor belt.

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