Liquid dispensing device

Abstract

To solve the problem that a structure for removing a sticking matter on cloth becomes complex.SOLUTION: A liquid discharge device comprises: a conveyance part which includes an endless conveyor belt abutting on a first surface of a medium to be mounted with the medium and then conveying it in a conveyance direction, and a first roller and a second roller having the conveyor belt extended around; a discharge part which discharges a liquid onto a second surface of the medium mounted on the conveyor belt downstream from the first roller and upstream from the second roller in a circumferential direction of the conveyor belt; a cleaning unit which cleans the conveyor belt where the medium is not mounted downstream from the second roller and upstream from the first roller in the circumferential direction of the conveyor belt; and a removal part which is provided upstream from the first roller in the conveyance direction and can remove a sticking matter sticking on the medium, the removal part abutting on the second surface of the medium and also abutting on the part of the conveyor belt where the medium is not mounted.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a liquid ejection device.

Background Art

[0002] Conventionally, as shown in Patent Document 1, an apparatus having a dedicated belt for removing deposits on a fabric and a removing unit having a dedicated cleaning tank for cleaning the belt is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the apparatus described in Patent Document 1 requires many dedicated parts to remove deposits on the fabric, and there is a risk that the configuration becomes complicated.

Means for Solving the Problems

[0005] The liquid ejection device includes a conveying unit including an endless conveying belt that abuts on a first surface of a medium, places the medium thereon, and conveys the medium in a conveying direction, and a first roller and a second roller over which the conveying belt is spanned; a discharging unit that discharges liquid onto a second surface of the medium placed on the conveying belt downstream of the first roller and upstream of the second roller in the circumferential direction of the conveying belt; a cleaning unit that cleans a portion of the conveying belt where the medium is not placed downstream of the second roller and upstream of the first roller in the circumferential direction of the conveying belt; and a removing unit provided upstream of the first roller in the conveying direction and capable of removing deposits adhering to the medium, the removing unit abutting on the second surface of the medium and on a portion of the conveying belt where the medium is not placed.

[0006] The liquid dispensing device comprises a conveying section including an endless conveying belt that contacts the first surface of a medium to place the medium on it and conveys it in the conveying direction, and a first roller and a second roller over which the conveying belt is stretched; a dispensing section that discharges liquid onto the second surface of the medium placed on the conveying belt, downstream of the first roller and upstream of the second roller in the circumferential direction of the conveying belt; a cleaning section that cleans the portion of the conveying belt on which the medium is not placed, downstream of the second roller and upstream of the first roller in the circumferential direction of the conveying belt; and a removal section provided upstream of the first roller in the conveying direction, capable of removing deposits adhering to the medium, wherein the removal section has a blowing section that blows gas along a flow path that goes from the second surface of the medium to the portion of the conveying belt on which the medium is not placed. [Brief explanation of the drawing]

[0007] [Figure 1] A block diagram showing the configuration of a liquid dispensing device according to the embodiment. [Figure 2] A schematic diagram showing the configuration of a liquid dispensing device according to the first embodiment. [Figure 3] A schematic diagram showing the configuration of a liquid dispensing device according to the second embodiment. [Figure 4] A schematic diagram showing the configuration of a liquid dispensing device according to the third embodiment. [Modes for carrying out the invention]

[0008] The embodiments will be described below with reference to the drawings. In the drawings, directions will be described using a three-dimensional coordinate system in which the X, Y, and Z axes are mutually orthogonal. In this case, the direction along the X axis will be called the X direction, the direction along the Y axis will be called the Y direction, and the direction along the Z axis will be called the Z direction. For the sake of explanation, the positive Z direction will be referred to as the up direction or simply up, and the negative Z direction as the down direction or simply down; the positive X direction will be referred to as the right direction or simply right, and the negative X direction as the left direction or simply left; and the positive Y direction will be referred to as the forward direction or simply forward, and the negative Y direction as the backward direction or simply backward.

[0009] 1. Liquid dispensing device according to the first embodiment As shown in Figure 1, the liquid dispensing device 1 according to the first embodiment is composed of a control unit 10, a storage unit 11, a dispensing unit 12, a transport unit 20, a dispensing unit 21, a brake unit 22, a pressurizing unit 23, a removal unit 30, and a cleaning unit 31. The configuration of the liquid dispensing device 1 according to the first embodiment will be described with reference to Figure 2.

[0010] The control unit 10 consists of a CPU (Central Processing Unit) that comprehensively controls each part of the liquid dispensing device 1, a UART (Universal Asynchronous Receiver Transmitter) that manages input and output, and logic circuits such as an FPGA (Field Programmable Gate Array) and a PLD (Programmable Logic Device). The CPU is also simply called a processor. The memory unit 11 is composed of rewritable non-volatile memory such as flash ROM (Read Only Memory) and HDD (Hard Disk Drive), and volatile memory such as RAM (Random Access Memory). The CPU of the control unit 10 reads a program, such as firmware, stored in the non-volatile memory of the storage unit 11, and executes it using the RAM of the storage unit 11 as a working area.

[0011] The medium M shown in Figure 2 is, for example, a long piece of fabric made of natural or synthetic fibers. This long piece of fabric is also called a raw material roll. The liquid dispensing device 1 records data onto the medium M. The process of recording data onto the fabric is also called printing, and the medium M is also called the material to be printed. The medium M has a first surface M1 which is the transport surface and a second surface M2 which is the recording surface. The medium M also has a roll section R that is wound around a roll shaft. The medium M may have deposits F such as lint attached to it. If deposits F are attached to the second surface M2, the recording quality may deteriorate.

[0012] As shown in Figure 2, the conveying unit 20 is composed of an endless conveying belt 20a, a first roller which is a drive roller 20b, and a second roller which is a driven roller 20c. The conveying belt 20a is stretched over the drive roller 20b and the driven roller 20c. The conveyor belt 20a contacts the first surface M1 of the medium M, placing the medium M on it, and conveys the medium M in the conveying direction T across the drive roller 20b and the driven roller 20c. In the conveyor belt 20a, the surface that contacts the first surface M1 of the medium M is provided with a glue, which is an adhesive, and is capable of adsorbing the medium M. The glue is composed of, for example, a silicone resin.

[0013] The conveying unit 20 uses a conveying motor (not shown) to rotate the drive roller 20b counterclockwise, and the driven roller 20c also rotates counterclockwise in response. The conveying belt 20a, which is stretched between the drive roller 20b and the driven roller 20c, also rotates counterclockwise in the circumferential direction C. The circumferential direction C includes the forward direction C1 from the drive roller 20b to the driven roller 20c, and the return direction C2 from the driven roller 20c to the drive roller 20b, with the drive roller 20b as the reference point. Note that the relationship between the drive roller 20b and the driven roller 20c may be reversed.

[0014] The forward direction C1 of the conveyor belt 20a and the conveying direction T of the medium M, which is placed on the conveyor belt 20a and moves from the drive roller 20b to the driven roller 20c, are in the same direction. Furthermore, the portion of the conveyor belt 20a heading in the forward direction C1 is the portion on which the medium M of the conveyor belt 20a is placed, while the portion of the conveyor belt 20a heading in the return direction C2 is the portion on which the medium M of the conveyor belt 20a is not placed.

[0015] The discharge unit 12 is disposed downstream of the drive roller 20b and upstream of the driven roller 20c in the circumferential direction C and the conveyance direction T of the conveyance belt 20a. The discharge unit 12 discharges liquid onto the second surface M2 of the medium M placed on the conveyance belt 20a that travels in the forward path direction C1. Further, a cleaning unit 31 is disposed downstream of the driven roller 20c and upstream of the drive roller 20b in the circumferential direction C of the conveyance belt 20a. The cleaning unit 31 cleans a portion of the conveyance belt 20a that travels in the return path direction C2 and on which the medium M is not placed.

[0016] As shown in FIG. 2, from upstream to downstream in the conveyance direction T of the medium M, a removal unit 30, a roll unit R, a feeding unit 21, a brake unit 22, a drive roller 20b, a pressing unit 23, a discharge unit 12, and a driven roller 20c are arranged. Hereinafter, each component will be described in this order.

[0017] The removal unit 30 is arranged upstream of the drive roller 20b in the conveyance direction T so as to contact the second surface M2 of the medium M wound around the roll unit R. The position where the removal unit 30 is provided is also upstream of the pressing unit 23 and the discharge unit 12 in the conveyance direction T. The removal unit 30 includes a removal roller 30a and is rotatable together with the roll unit R and the drive roller 20b via the conveyance belt 20a. Preferably, in addition to the removal roller 30a, the removal unit 30 has a pile fabric 30b which is a member for removing the deposit F formed on the outer peripheral surface of the removal roller 30a. The pile fabric 30b of the removal roller 30a can preferably remove the deposit F from the second surface M2 of the medium M and transfer it to the conveyance belt 20a side.

[0018] The removal unit 30 also contacts a portion of the conveyance belt 20a on which the medium M is not placed. The removal roller 30a of the removal unit 30 has no drive source and is also a driven roller that rotates in a clockwise direction by contacting the conveyance belt 20a that travels in the return path direction C2 of the conveyance unit 20.

[0019] When the pile fabric base 30b of the removal roller 30a of the removal unit 30 rotates passively, frictional resistance is generated between it and the second surface M2 of the medium M. Due to this frictional resistance, the adhering matter F adhering to the second surface M2 can be rubbed against the pile fabric base 30b and move to the side of the pile fabric base 30b. As a result, the discharge unit 12 can discharge and record liquid on the second surface M2 of the medium M from which the adhering matter F has been removed. Further, the removal unit 30 can suppress the adhering matter F from adhering to the pressurizing unit 23 downstream in the transport direction T. In the transport belt 20a, the above-mentioned glue having adhesiveness that easily adheres the adhering matter F is applied to the first surface M1 of the medium M and the side that contacts the removal unit 30.

[0020] In this way, the removal unit 30 can contact the second surface M2 of the medium M and also contact the portion of the transport belt 20a where the medium M is not placed. The adhering matter F on the second surface M2 of the medium M is moved while contacting in turn the roll unit R, the removal unit 30, and the transport belt 20a while each is rotating.

[0021] The medium M from which the adhering matter F on the second surface M2 has been removed is pulled out from the roll unit R in the transport direction T by the feeding unit 21 that rotates counterclockwise. At this time, the roll unit R also contacts the removal unit 30 while rotating counterclockwise. The feeding unit 21 includes a feeding motor and a feeding roller (not shown) and can pull out the medium M at a predetermined speed under the control of the control unit 10.

[0022] The brake unit 22 includes a brake roller that applies a predetermined tension to the medium M and two brake driven rollers arranged upstream and downstream in the transport direction T with respect to the brake roller. The brake unit 22 may include a brake roller moving mechanism (not shown) that moves the position of the brake roller. The brake unit 22 can move the position of the brake roller by the brake roller moving mechanism under the control of the control unit 10 and apply a predetermined tension to the medium M.

[0023] The pressurizing section 23 is located upstream of the discharge section 12 in the conveying direction T, and downstream of the removal section 30 in the circumferential direction of the conveying belt 20a. The pressurizing section 23 contacts the second surface M2 of the medium M at a predetermined pressure, and can bring the first surface M1 into close contact with the conveying belt 20a. The pressurizing unit 23 has a pressurizing roller that contacts the second surface M2 of the medium M, is rotatable clockwise, and is slidable in the upstream and downstream directions of the conveying direction T. The pressurizing unit 23 may also include a pressurizing roller moving mechanism (not shown) that moves the position of the pressurizing roller up and down relative to the medium M. Under the control of the control unit 10, the pressurizing unit 23 moves the position of the pressurizing roller up and down using the pressurizing roller moving mechanism, thereby bringing the first surface M1 of the medium M into close contact with the conveying belt 20a at a predetermined pressure.

[0024] On the conveyor belt 20a, the surface that contacts the first surface M1 of the medium M has deposits F transferred from the removal unit 30. The pressurizing unit 23 pressurizes the first surface M1 against the conveyor belt 20a at a predetermined pressure, thereby suppressing unevenness on the surface of the second surface M2, which is the recording surface, even if deposits F are present on the conveyor belt 20a. As a result, good recording quality can be obtained when recording on the second surface M2 by the discharge unit 12.

[0025] As shown in Figure 2, the discharge section 12 is located downstream of the drive roller 20b and upstream of the driven roller 20c in the circumferential direction C of the conveyor belt 20a. Furthermore, the discharge section 12 is located in the forward direction C1 of the conveyor belt 20a, and is positioned opposite the second surface M2 of the medium M that is conveyed in the conveying direction T by the conveying section 20.

[0026] The ejection unit 12 is composed of an inkjet type head, carriage, and carriage motor. The liquid dispensing device 1 can be fitted with ink cartridges or ink tanks that store inks of various colors, such as CMYK (Cyan, Magenta, Yellow, Black). Furthermore, the liquid ejection device 1 is equipped with a supply mechanism (not shown) that supplies ink from an ink cartridge or the like to the print head. The supply mechanism supplies ink of each color from the ink cartridge or the like to the corresponding nozzles of the print head.

[0027] The head of the discharge unit 12 is mounted on a carriage and moves back and forth along with the carriage on the medium M placed on the conveyor belt 20a by a carriage motor. Under control based on recorded data from the control unit 10, the head moves on the medium M and discharges liquid ink droplets from the nozzle onto the second surface M2 of the medium M, making it recordable. The recorded data is stored in the storage unit 11. The recorded data may be read from the storage medium by a reading unit provided in the storage unit 11, or it may be acquired from an external device. Furthermore, the ink colors can be any combination of four or more colors, including, for example, shades of CMYK. The print head may also include a nozzle for dispensing a penetrant liquid into the medium M. The penetrant liquid is a liquid that facilitates the penetration of ink droplets that have landed on the second surface M2 of the medium M into the first surface M1.

[0028] Next, as shown in Figure 2, the cleaning unit 31 and the removal unit 30 are arranged in the circumferential direction C of the conveyor belt 20a, from downstream of the driven roller 20c to upstream of the drive roller 20b. The following explanation will proceed in this order.

[0029] The cleaning unit 31 is located upstream of the removal unit 30 in the return direction C2 of the conveyor belt 20a. The cleaning unit 31 can clean the portion of the conveyor belt 20a where recording by the discharge unit 12 has finished, the medium M has been peeled off, and the medium M is no longer present, thereby removing any adhering ink. At the same time, the cleaning unit 31 can also remove any adhering substances F by cleaning the portion of the conveyor belt 20a where the medium M is not present. As a result, the conveyor belt 20a, which has been cleaned and the adhering substances F removed, can then readily accept adhering substances F from the removal unit 30 again.

[0030] The cleaning unit 31 comprises a brush roller 31a, a motor for the brush roller (not shown), and a wiping blade 31c. Brushes are formed on the outer surface of the brush roller 31a. Under the control of the control unit 10, the cleaning unit 31 rotates the brush roller 31a with the motor for the brush roller, and can clean the conveyor belt 20a by rubbing it with the brushes.

[0031] The washing tank 31b stores the washing solution and supplies and drains water to maintain a constant liquid level. The brush roller 31a is immersed to a certain depth in the washing solution stored in the washing tank 31b, and any attached deposits F etc. are removed during washing. The brush roller 31a may be a cylindrical piece of cloth or sponge, or a brush, or a flat piece of rubber or resin.

[0032] The conveyor belt 20a, which has been cleaned by the brush roller 31a, has any adhering cleaning solution or adhering substances F wiped off by the wiping blade 31c. The cleaning unit 31 may include a wiping blade moving mechanism (not shown) that moves the wiping blade 31c forward and backward relative to the conveyor belt 20a. Under the control of the control unit 10, the cleaning unit 31 can move the wiping blade 31c forward and backward using the wiping blade moving mechanism and adjust the strength with which the wiping blade 31c presses against the conveyor belt 20a. The wiping blade 31c may be made of wiper-shaped rubber or plate-shaped resin.

[0033] After the adhering material F is removed from the conveyor belt 20a by the cleaning unit 31, the removal unit 30 comes into contact with the conveyor belt 20a again, as described above, and the adhering material F on the removal unit 30 can be transferred to the conveyor belt 20a side.

[0034] 2. Liquid dispensing device according to the second embodiment The liquid dispensing device 2 according to the second embodiment shown in Figure 3 differs from the liquid dispensing device 1 according to the first embodiment shown in Figure 2 mainly in the position of the removal section 30 and the presence of a member that movably supports the roll section R. In the following, the liquid dispensing device 2 will be described focusing on the differences from the liquid dispensing device 1, and the same configuration as the liquid dispensing device 1 will not be described. In addition, in the liquid dispensing device 2 shown in Figure 3, the same components as those in the liquid dispensing device 1 shown in Figure 2 are denoted by the same reference numerals.

[0035] A rotating shaft 26 is rotatably fixed to the housing of the liquid dispensing device 2. An arm 25 extends from the rotating shaft 26 and connects the rotating shaft 26 to the setting unit 24. The setting unit 24 supports the axis of the roll unit R. The user can attach the axis of the roll unit R to the setting unit 24 and set the roll unit R in the liquid dispensing device 2.

[0036] The arm 25 can rotate the set section 24 downwards with the rotation axis 26 as its center of rotation. The roll section R attached to the set section 24 can be pressed against the removal section 30 along the trajectory of a circular arc with the length of the arm 25 as its radius, with the rotation axis 26 as its center of rotation. Preferably, the setting section 24 is configured with a dispensing section 21. The dispensing section 21 rotates the axis of the roll section R counterclockwise, allowing the medium M to be drawn out from the roll section R.

[0037] The removal unit 30 is located in a position where it can contact the portion of the conveyor belt 20a on which the medium M is not placed, and which is wound around the drive roller 20b. The removal unit 30 can rotate clockwise while in contact with the conveyor belt 20a and the roll unit R. The material F adhering to the second surface M2 of the medium M is transferred as it comes into contact with the roll section R, the removal section 30, and the conveyor belt 20a in that order, each rotating as it moves.

[0038] Even as the diameter of the roll section R decreases due to the use of the medium M, the roll section R can continue to contact the removal section 30 while rotating around the rotation axis 26 due to its own weight. At this time, the roll section R can press against the removal section 30 with a pressing force G due to its own weight. Thus, even when the medium M is pulled out from the roll section R and the diameter of the roll section R gradually changes, the arm section rotates and gradually moves downward due to the weight of the roll section R, so that the roll section R can continue to contact the removal section 30 while pressing it with a pressing force G.

[0039] 3. Liquid dispensing device according to the third embodiment The liquid dispensing device 3 according to the third embodiment shown in Figure 4 differs from the liquid dispensing device 1 according to the first embodiment shown in Figure 2 mainly in the configuration and position of the removal section 30. In the following, the liquid dispensing device 3 will be described focusing on the differences from the liquid dispensing device 1, and the same configuration as the liquid dispensing device 1 will not be described. In addition, in the liquid dispensing device 3 shown in Figure 4, the same components as those in the liquid dispensing device 1 shown in Figure 2 are denoted by the same reference numerals.

[0040] The removal section 30 of the liquid discharge device 3 does not include a removal roller 30a like the liquid discharge device 1, but rather includes a blower section 30c, a guide 30d, and a flow path 30e. The blower section 30c of the removal section 30 is located upstream of the drive roller 20b in the transport direction T and is capable of removing deposits adhering to the medium M.

[0041] The blowing section 30c of the removal section 30 has a fan. The gas flow path 30e of the blowing section 30c passes through the second surface M2 of the medium M and is directed toward the portion of the conveyor belt 20a on which the medium M is not placed, and which is wound around the drive roller 20b. The blowing section 30c can blow gas along the flow path 30e. The blower section 30c of the removal section 30 blows gas to blow the adhering material F from the second surface M2 of the medium M on the roll section R toward the conveyor belt 20a, which is wrapped around the drive roller 20b and does not have the medium M on it, thereby transferring it.

[0042] The roll section R is located upstream of the drive roller 20b in the conveying direction T, and is positioned such that the flow path 30e passes through the second surface M2 of the medium M. The guide 30d faces the roll section R at least in part and restricts the flow path 30e. Specifically, the upper side of the flow path 30e passes through the second surface M2 of the medium M on the roll section R, and the lower side of the flow path 30e is restricted by the guide 30d. The deposits F adhering to the second surface M2 of the medium M are blown by the blower unit 30c toward the conveyor belt 20a wrapped around the drive roller 20b. At this time, the guide 30d restricts the flow path 30e from below, suppressing the scattering of the deposits F downwards, and allowing them to adhere to the conveyor belt 20a more reliably.

[0043] The blower unit 30c is positioned vertically above the position of the conveyor belt 20a in the circumferential direction C, from the driven roller 20c towards the drive roller 20b. In other words, the blower unit 30c blows gas toward the conveyor belt 20a that is wound around the drive roller 20b, and is therefore located vertically between the conveyor belt 20a moving in the forward direction C1 and the conveyor belt 20a moving in the return direction C2.

[0044] In the example shown in Figure 4, the diameter of the drive roller 20b is configured to be larger than the diameter of the roll section R. The upper part of the flow path 30e passes under the roll section R and then heads towards the lower part of the drive roller 20b around which the conveyor belt 20a is wound. The lower part of the flow path 30e is restricted by the guide 30d. The guide 30d is sloped vertically such that it is higher when closer to the air blower section 30c and lower when closer to the conveyor belt 20a. In this way, the flow path 30e is configured to have a gentle angle.

[0045] The conveyor belt 20a is a glue belt having the aforementioned adhesive glue on the surface that contacts the first surface M1 of the medium M. The glue has the property of becoming more adhesive when heated. Downstream of the flow path 30e, near the guide 30d, there is a conveyor belt 20a that is wound around a drive roller 20b, to which deposits F blown away by the blower 30c adhere. The guide 30d is equipped with a heater 30f near the drive roller 20b, allowing the guide 30d to be heated. The radiant heat from the heated guide 30d can heat the conveyor belt 20a, thereby increasing the adhesiveness of the glue.

[0046] The adhering material F, which is thrown from the medium M in the roll section R toward the conveyor belt 20a, is more likely to adhere to the glue on the conveyor belt 20a, which has become more viscous due to the heater 30f mounted on the guide 30d. Furthermore, the increased adhesiveness of the glue makes it easier for the first surface M1 of the medium M to adhere to the conveyor belt 20a. Even if there is some residue F between the first surface M1 of the medium M and the conveyor belt 20a, the unevenness of the surface of the second surface M2, which is the recording surface, is further suppressed, and good recording quality can be obtained when recording on the second surface M2 by the discharge unit 12.

[0047] As described above, the liquid dispensing devices 1 and 2 are equipped with a removal unit 30 located upstream of the drive roller 20b in the conveying direction T, which contacts the second surface M2 of the medium M and also contacts the portion of the conveying belt 20a on which the medium M is not placed. The removal unit 30 can remove any attached material F from the medium M and transfer it to the conveying belt 20a. The liquid dispensing devices 1 and 2 can remove deposits F adhering to the medium M using the removal unit 30. In addition, the cleaning unit 31 can remove deposits F adhering to the conveyor belt 20a by cleaning the conveyor belt 20a and removing any ink that has adhered to it. Thus, the liquid dispensing devices 1 and 2 do not require many specialized parts to remove deposits F adhering to the medium M, and can have a simple configuration.

[0048] Furthermore, the liquid discharge device 3 is equipped with a removal unit 30 located upstream of the drive roller 20b in the conveying direction T, which has a blowing unit 30c that blows gas along a flow path 30e that goes from the second surface M2 of the medium M toward the portion of the conveying belt 20a where the medium M is not placed. The removal unit 30 can remove any attached substances F adhering to the medium M and transfer them toward the conveying belt 20a. The liquid dispensing device 3 can remove deposits F adhering to the medium M by a removal unit 30 having a blower unit 30c. In addition, a cleaning unit 31 can remove deposits F adhering to the conveyor belt 20a by cleaning the conveyor belt 20a and removing any ink that has adhered to it. Thus, the liquid dispensing device 3 does not require many specialized parts to remove deposits F adhering to the medium M, and can have a simple configuration.

[0049] Although these embodiments have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications, substitutions, deletions, etc., may be made as long as they do not depart from the spirit of this invention. For example, in the above example, the discharge section 12 of the liquid discharge devices 1, 2, and 3 was described as a serial type in which the head is mounted on a carriage and moves, but it may also be a line type in which the head is fixed and there is no carriage. In addition, the conveying section 20 may be equipped with a winding device that winds up the medium M that has been peeled off from the conveying belt 20a at a position close to the drive roller 20b.

[0050] In the above example, the liquid dispensing devices 1, 2, and 3 were equipped with a dispensing unit 21, a brake unit 22, and a pressurizing unit 23. However, the dispensing unit 21 may be omitted if the conveying force of the conveying unit 20 is sufficient, the brake unit 22 may be omitted if sufficient tension is applied to the medium M by the conveying unit 20, and the pressurizing unit 23 may be omitted if the conveying belt 20a can be in close contact with the medium M. Furthermore, the liquid dispensing devices 1, 2, and 3 may also include a drying device for drying the cleaning solution adhering to the conveyor belt 20a, a coating device for applying glue to the conveyor belt 20a, and the like. [Explanation of symbols]

[0051] 1,2,3...Liquid dispensing device, 10...Control unit, 11...Storage unit, 12...Dispensing unit, 20...Conveying unit, 20a...Conveying belt, 20b...Driven roller, 20c...Driven roller, 21...Feeding unit, 22...Brake unit, 23...Pressurizing unit, 24...Setting unit, 25...Arm, 26...Rotating shaft, 30...Removal unit, 30a...Removal roller, 30b...Pile fabric, 30c...Air blowing unit, 30d...Guide, 30e...Flow path, 30f...Heater, 31...Washing unit, C...Circumferential direction, F...Adhered material, M...Media, M1...First surface, M2...Second surface, R...Roll section, T...Conveying direction.

Claims

1. A conveying unit including an endless conveying belt that contacts the first surface of the medium to place the medium on it and conveys it in the conveying direction, and a first roller and a second roller over which the conveying belt is stretched, A discharge unit is provided downstream of the first roller and upstream of the second roller in the circumferential direction of the conveyor belt, which discharges liquid onto the second surface of the medium placed on the conveyor belt. A cleaning unit for cleaning the portion of the conveyor belt where the medium is not placed, downstream of the second roller and upstream of the first roller in the circumferential direction of the conveyor belt, The system includes a removal unit provided upstream of the first roller in the conveying direction, which is capable of removing deposits adhering to the medium, The removal unit is characterized in that it contacts the second surface of the medium and contacts the portion of the conveyor belt on which the medium is not placed.

2. The liquid dispensing device according to claim 1, characterized in that the removal section is made of pile fabric.

3. The medium has a roll portion wound around a roll shaft, and the roll portion is located upstream of the first roller in the conveying direction. The liquid dispensing device according to claim 1 or 2, characterized in that the removal section is in contact with the second surface of the medium in the roll section.

4. A set section for attaching the aforementioned roll section, A rotating shaft that rotatably supports the aforementioned set section, It comprises an arm portion connecting the rotating shaft and the set portion, The liquid dispensing device according to claim 3, characterized in that the arm portion is rotatable toward the removal portion with respect to the rotation axis.

5. The medium has a pressure roller that contacts the second surface and slides in the upstream and downstream directions of the conveying direction, The aforementioned pressure roller is Located upstream of the discharge section in the conveying direction, The liquid dispensing device according to claim 1 or 2, characterized in that it is located downstream of the removal section in the circumferential direction of the conveyor belt.

6. The liquid dispensing device according to claim 1 or 2, characterized in that the removal section is a driven roller that rotates under its own power.

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