JP2014065289A - Treatment agent liquid coating device for inkjet printer and image formation system including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment agent liquid coating device for an inkjet printer capable of adjusting (changing) an amount of a treatment agent liquid coated per unit area of a medium to be recorded.SOLUTION: A squeeze roller 29 includes: a hollow roller body 51 in which a large number of hole parts 55 penetrating from an inner circumferential surface toward an outer circumferential surface are formed; and a film member 52 having elasticity, which is fixed on the inner circumferential surface of the roller body 51 and covers each of inner circumferential surface side openings 56 of hole parts 55. The hole parts 55 of the roller body 51 and the film member 52 constitutes a recess part 54 for scooping up. Covering parts of the film member 52, which covers the inner circumferential surface side openings 56 of the hole parts 55, are expanded or contracted by adjusting pressure inside the roller body 51 to adjust a volume of the recess part 54 for scooping up.

Description

  The present invention relates to a processing agent solution coating apparatus for an ink jet printer, and more particularly to a configuration of a squeeze roller that pumps the processing agent solution toward the coating roller.

  Inkjet image forming systems, for example, have problems with initial quality such as ink bleeding, density, color tone and show-through when forming an image on a recording medium such as paper, or robustness of images such as water resistance and weather resistance. In order to solve the problem related to the property, the recording medium is provided with a processing agent liquid application device for applying a processing agent liquid such as an aggregating agent having a function of aggregating the ink droplets before the ink droplets adhere to the recording medium. A method of improving the image quality by applying a treatment liquid in advance is generally put into practical use.

  The processing agent liquid coating apparatus includes a supply pan for storing the processing agent liquid, a squeeze roller provided with a plurality of recesses capable of holding the processing agent liquid on an outer peripheral portion, and supply of the processing agent liquid from the outer peripheral portion of the squeeze roller. And a coating roller that coats the recording medium and a pressure roller that faces and arranges the coating roller so as to sandwich and transport the recording medium, and applies the treatment liquid to the recording medium before printing. It is configured.

FIG. 14 is a schematic configuration diagram of a coating unit in a conventional processing agent solution coating apparatus.
The conventional processing agent solution coating apparatus has a supply pan 72 for storing the processing agent solution 71 and a processing agent solution 71 stored in the supply pan 72 having a large number of pumping recesses 73 on the outer periphery. A squeeze roller 74 that pumps up, a coating roller 75 that contacts the outer peripheral portion of the squeeze roller 74, transfers the treatment liquid 71 pumped up by the squeeze roller 74, and applies it onto the recording medium W, and the coating roller 75. And a pressure roller 76 that sandwiches and conveys the recording medium W between the application roller 75 and the like.

  As described above, in the conventional processing agent liquid coating apparatus, the pumping recess 73 is integrally provided on the outer periphery of the squeeze roller 74, and a certain amount of the processing agent liquid 71 is pumped up to the application roller 75 side. It was out.

  As a prior art document regarding this processing agent solution coating apparatus, for example, JP 2011-194619 A (Patent Document 1) can be cited.

  In Japanese Patent Application Laid-Open No. 2011-194619 (Patent Document 1), after applying the processing agent liquid to the recording medium, the processing agent liquid accumulates (remains) in the vicinity of the nip portion between the application roller and the squeeze roller. The squeeze roller rotates with the application roller and the pressure roller separated after applying the treatment agent liquid to the recording medium for the purpose of preventing the application efficiency from being reduced and causing uneven application of the treatment agent liquid. The operation of rotating the speed at a speed higher than the rotation speed of the application roller and the operation of separating the squeeze roller and the application roller are performed, and the treatment liquid accumulated in the vicinity of the nip portion between the squeeze roller and the application roller is squeezed as described above. A technique for collecting in a processing agent liquid tray by a rotating operation of a roller is disclosed.

However, this conventional processing agent solution coating apparatus is configured to prevent the processing agent solution from collecting (remaining) in the vicinity of the nip portion between the applying roller and the squeeze roller after applying the processing agent solution to the recording medium. The processing agent liquid that has accumulated is spun off toward the processing agent liquid tray and collected. For example, depending on the type of recording medium, the amount of processing agent liquid applied per unit area of the recording medium There is no technical idea to adjust.
Accordingly, it is not possible to arbitrarily adjust (change) the amount of the processing agent liquid applied per unit area of the recording medium.

  An object of the present invention is to provide a treatment liquid application apparatus for an ink jet printer that can adjust (change) the amount of a treatment liquid applied per unit area of a recording medium.

In order to achieve the above object, the present invention provides:
A supply pan for storing the treatment liquid,
A squeeze roller that has a large number of recesses for pumping on the outer periphery and pumps up the processing liquid stored in the supply pan;
An application roller that contacts the outer periphery of the squeeze roller and transfers the treatment liquid pumped up by the squeeze roller to apply it onto the recording medium;
The present invention is intended for a processing agent liquid coating apparatus for an ink jet printer, which is provided so as to face the coating roller and includes a pressure roller that sandwiches and conveys the recording medium between the coating roller.

And the 1st means of this invention is a hollow roller main body in which the said squeeze roller formed many holes which penetrate from an inner peripheral surface toward an outer peripheral surface, and the inner peripheral surface of the said roller main body And a film member having elasticity that closes the inner peripheral surface side opening of each of the holes, and a recess for pumping is formed by the hole of the roller body and the film member,
The closed portion of the film member that closes the opening on the inner peripheral surface side of the hole is expanded and contracted by adjusting the pressure inside the roller body to adjust the volume of the pumping recess. It is what.

According to a second means of the present invention, the squeeze roller has a hollow roller body that is not elastically deformed and has a plurality of holes that penetrate from the inner circumferential surface toward the outer circumferential surface, and an inner circumferential surface of the roller body. A film member having elasticity that is fixed and closes an opening on the inner peripheral surface side of each hole portion, and a recess for pumping is formed by the hole portion of the roller body and the film member,
By expanding and contracting the closed portion of the film member closing the inner peripheral surface side opening of the hole by adjusting the pressure inside the roller body, the volume of the pumping recess is increased or decreased, The film thickness of the treatment liquid transferred to the application roller is adjusted.

The present invention is configured as described above, and it is possible to provide a treatment liquid application apparatus for an ink jet printer in which the amount of treatment liquid applied per unit area of a recording medium can be easily adjusted (changed). .
Further, it is possible to prevent an excessive treatment liquid from being applied to the recording medium, and to reduce the environmental load.

1 is a schematic configuration diagram for explaining a flow of an image forming system according to an embodiment of the present invention. It is a schematic block diagram of the processing agent liquid coating device used for the image forming system. It is a partial perspective view of the vicinity of the feed-in roller in the processing agent solution coating apparatus. It is a partial perspective view of the assembly of the pass shaft and the edge guide in the processing agent liquid coating apparatus. It is a partial perspective view of the vicinity of an in-feed roller (out-feed roller) in the processing agent solution coating apparatus. It is a schematic block diagram of the processing agent liquid application means in the processing agent liquid application device. It is a schematic block diagram for demonstrating the application quantity variable means in the application means. It is an expanded sectional view of the squeeze roller used for the application amount varying means. It is an expanded sectional view which shows the state where the film member of the processing agent liquid application means was partially pushed out to the diameter direction outside, and the amount of pumping of the processing agent liquid decreased. It is an expanded sectional view which shows the state where the film member of the processing agent liquid application means was partially drawn inward in the radial direction and the pumping amount of the processing agent liquid increased. It is a flowchart for demonstrating a series of operation | movement of the processing agent liquid coating device which concerns on the Example of this invention. It is a schematic block diagram for demonstrating the coating amount variable means in the coating means of the processing agent liquid coating apparatus which concerns on the other Example of this invention. It is a flowchart for demonstrating a series of operation | movement of the processing agent liquid coating device which concerns on another Example. It is a schematic block diagram of the application | coating means in the conventional processing agent liquid application apparatus.

  An embodiment of the present invention will be described. The present invention has the following characteristics when pumping the treatment liquid with a squeeze roller.

  In short, the squeeze roller has a hollow roller body that is not elastically deformed and has a large number of holes penetrating from the inner peripheral surface toward the outer peripheral surface, and is fixed to the inner peripheral surface of the roller main body, A film member having elasticity that closes the opening on the inner peripheral surface side is provided, a recess for pumping is formed by the hole portion of the roller body and the film member, and the inner peripheral surface side opening of the hole portion is closed. The closed portion of the film member is expanded and contracted by adjusting the pressure inside the roller body to adjust the volume of the pumping recess.

  According to the present invention, it is possible to provide a treatment liquid application apparatus for an ink jet printer in which the amount of the treatment liquid applied per unit area of a recording medium can be easily adjusted (changed). Further, it is possible to prevent an excessive treatment liquid from being applied to the recording medium, and to reduce the environmental load.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram for explaining the flow of an image forming system according to an embodiment of the present invention.

  As shown in FIG. 1, a recording medium W made of, for example, a long continuous sheet fed from a paper feeding device 100 is first fed into a processing agent solution coating apparatus 101, and both front and back surfaces of the recording medium W are recorded. A pretreatment is performed by applying a treatment liquid such as an inhibitor having a function of aggregating ink droplets to each other.

Next, the processed recording medium W is sent to the first inkjet printer 102a, and ink droplets are ejected to the front side of the recording medium W to form a desired image. The front and back sides of W are reversed, and the recording medium W is subsequently fed into the second inkjet printer 102b, and ink droplets are ejected to the back side of the recording medium W to form a desired image.
After printing on both sides of the recording medium W in this way, the system is sent to a post-processing device (not shown) to perform predetermined post-processing.

FIG. 2 is a schematic configuration diagram of a processing agent solution coating apparatus used in this image forming system, and shows a state during application of the processing agent solution.
As shown in the drawing, a bearing (not shown) is provided at the end of the roller, and a large number of rotatable guide rollers 1 are installed in the processing agent solution coating apparatus 101 to convey the recording medium W. Is secured.

  Reference numeral 2 in the figure denotes a feed-in roller (FI roller) that is rotationally driven by a drive source (not shown) such as a motor. As shown in FIG. A nip roller (FI nip roller) 4 is pressed.

  The recording medium W is elastically sandwiched between the FI roller 2 and the FI nip roller 4, and the FI roller 2 is rotated by the driving source, so that the sheet feeding device is provided inside the processing agent liquid coating device 101. The recording medium W can be drawn from 100.

  The recording medium W fed from the FI roller 2 and the FI nip roller 4 is slightly slackened to form an air loop AL, and the amount of slack in the air loop AL is monitored by an optical sensor (not shown). The FI roller 2 is driven and controlled so that the amount is constant.

  The recording medium W that has passed through the air loop AL passes between the pass shaft 5 and the edge guide 6. The state is shown in FIG. 4, in which two pass shafts 5 are arranged in a direction orthogonal to the conveyance direction (arrow direction) of the recording medium W, and the recording medium W is placed between the pass shafts 5 in S. It passes in the shape of A pair of edge guides 6 are supported at both ends of the pass shaft 5, and the distance between the edge guides 6 is set to be the same as the width of the recording medium W.

  Therefore, the travel position in the width direction of the recording medium W is regulated by the action of the pass shaft 5 and the edge guide 6, and stable travel is possible. The edge guide 6 is fixed to the pass shaft 5 by a fixing means such as a screw, for example, and the position of the edge guide 6 can be adjusted according to the width dimension of the recording medium W to be used. The recording medium W that has passed between the pass shaft 5 and the edge guide 6 is given a tension for running stability by the tension shaft 7 in a fixed state.

  The recording medium W that has passed through the tension shaft 7 passes between an infeed roller 8 and a feed nip roller 9 that are rotationally driven by a drive source (not shown) such as a motor. As shown in FIG. 5, a plurality of feed nip rollers 9 are arranged along the axial direction of the infeed roller 8, and each feed nip roller 9 is pressed against the infeed roller 8 side by a spring 10.

  The recording medium W that has passed between the in-feed roller 8 and the feed nip roller 9 is wound from the lower side of one rotatable first dancer roller 11. The first dancer roller 11 is rotatably attached to the first movable frame 12 via a bearing (not shown) provided at the end of the roller to constitute a first dancer unit 17. Accordingly, the first dancer unit 17 is suspended from the recording medium W.

  The first dancer unit 17 is movable along the gravity direction A. First dancer unit position detection means (not shown) for detecting the position of the first dancer unit 17 is provided, and the drive source of the infeed roller 8 is driven and controlled according to the output of the position detection means. By doing so, the position of the first dancer unit 17 can be adjusted.

  The recording medium W that has passed through the first dancer unit 17 has a surface application unit 13f that applies a treatment liquid to the front side thereof, and a back surface application unit 13r that applies a treatment liquid to the back side of the recording medium W. , The processing agent liquid is applied to both surfaces of the recording medium W. The treatment liquid applying means 13 will be described later.

  The recording medium W that has passed through the back coating means 13r passes between the outfeed roller 14 and the feed nip roller 9 that are rotationally driven by a drive source (not shown) such as a motor. As shown in FIG. 5, a plurality of feed nip rollers 9 are arranged along the axial direction of the outfeed roller 14, and each feed nip roller 9 is pressed against the outfeed roller 14 side by a spring 10.

  The recording medium W that has passed between the outfeed roller 14 and the feed nip roller 9 is formed into a W shape over the second dancer rollers 15a and 15b that are rotatable and the guide roller 1 disposed between the dancer rollers 15a and 15b. It is wrapped around.

  The two dancer rollers 15a and 15b are rotatably attached to the second movable frame 16 via bearings (not shown) provided at the roller ends to constitute a second dancer unit 18. . Therefore, the second dancer unit 18 is suspended by the recording medium W.

  The second dancer unit 18 is also movable along the gravitational direction A, and second dancer unit position detecting means (not shown) for detecting the position of the second dancer unit 18 is provided. The position of the second dancer unit 18 can be adjusted by controlling the driving source of the outfeed roller 14 in accordance with the output of the position detecting means.

FIG. 6 is a schematic configuration diagram of the treatment liquid applying unit 13.
As shown in FIG. 6, the treatment liquid 22 sealed and stored in the cartridge 21 is pumped up by a pump 23 and supplied to a supply pan 26 via a supply path 24 and an electromagnetic valve 25. As the treatment agent liquid 22, a liquid in which a water-soluble flocculant having a function of aggregating or insolubilizing a water-soluble colorant is dissolved or dispersed in water or an organic liquid is used.

  The amount of the processing agent liquid 22 in the supply pan 26 is detected by a liquid level detection sensor 27 attached to the supply pan 26, and the processing agent liquid 22 is consumed by repeated printing, and the processing agent in the supply pan 26 is consumed. When the liquid level of the liquid 22 falls below a specified height (control line), the electromagnetic valve 25 opens, the pump 23 is driven, and the processing agent liquid 22 in the cartridge 21 is supplied to the supply pan 26.

  When the liquid level position of the processing agent liquid 22 in the supply pan 26 reaches a predetermined height (control line), the electromagnetic valve 25 is closed and the pump 23 is stopped based on the detection signal of the liquid level detection sensor 27. The amount of the processing agent liquid 22 in the supply pan 26 is kept constant.

  As described above, the electromagnetic valve 25 is opened only when the treatment liquid 22 is supplied, and the operation time is short. Therefore, if a normally closed type valve that is closed except when energized is used, the power consumption of the electromagnetic valve 25 is reduced. The running cost can be reduced.

  The treatment liquid 22 stored in the supply pan 26 is pumped up by the rotation of a squeeze roller 29 driven by a motor 28. As the squeeze roller 29, for example, an anonyx roller or a wire bar having a rough surface formed on the peripheral surface of the roller, the viscosity of the treatment liquid 22, the influence of the printing speed, etc. at the time of pumping are used. It is difficult to receive, and the amount of pumping up the treatment liquid 22 is stable.

  A surplus of the treatment liquid 22 pumped up by the squeeze roller 29 is scraped off by the metering blade 30, and a prescribed amount is conveyed to the nip portion with the application roller 31. The treatment liquid 22 carried to the nip portion between the squeeze roller 29 and the application roller 31 is transferred to the application roller 31 while being uniformly stretched in the axial direction between the rollers 29 and 31 to be thinned. . The application roller 31 has a peripheral surface covered with an elastic body such as rubber, and is driven to rotate by a motor 32.

The treatment liquid 22 applied to the application roller 31 is transferred and applied to the recording medium W that is sandwiched and conveyed between the application roller 31 and the pressure roller 33.
The pressure roller 33 is rotatably supported at a substantially central position of the swingable arm 34 via a bearing (not shown), and rotates following the recording medium W that is transported and moved. A tension spring 36 is connected to the end of the arm 34 opposite to the swing center 35, and the pressure roller 33 is pressed against the application roller 31 side by the lever principle.

  An eccentric cam 37 provided between the pressure roller 33 and the tension spring 36 is in contact with the arm 34, and the pressure roller 33 is applied against the elasticity of the tension spring 36 by the rotation of the eccentric cam 37. It can be moved away from the roller 31.

The supply pan 26 is provided with an opening 38 at a portion where the pressure roller 33 is in contact with and away from the supply pan 26, and a shutter 39 for suppressing the evaporation of the moisture of the processing agent liquid 22 or the organic liquid can be opened and closed in the opening 38. Is provided. As shown in FIG. 6, the shutter 39 opens while the pressure roller 33 moves toward the application roller 31, and the shutter 39 closes while the pressure roller 33 is away from the application roller 31. It has become.
The application roller 31 is cleaned by the cleaner blade 40 after the treatment liquid 22 is transferred to the recording medium W, and is prepared for the next transfer of the treatment liquid 22.

  FIG. 7 is a schematic configuration diagram for explaining the application amount varying means in the application means, and FIG. 8 is an enlarged sectional view of a squeeze roller 29 used in the application amount varying means.

  The squeeze roller 29 includes a roller main body 51 and a film member 52 attached so as to cover the inner peripheral surface of the roller main body 51. The roller body 51 is made of a material that is not easily elastically deformed, such as metal or reinforced plastic, and has a large number of holes 55 (see FIG. 8) penetrating from the inner peripheral surface to the outer peripheral surface in the cylindrical portion of the roller main body 51. Has been. The planar shape of the hole 55 has an appropriate shape such as a round shape, a square shape, or a rectangular shape.

  On the other hand, the film member 52 is made of an elastic (stretchable) material such as a thin rubber sheet, and is attached in close contact with the inner peripheral surface of the cylindrical portion of the roller main body 51. The inner peripheral surface side opening 56 of 55 is closed. In this way, the hole 55 of the roller body 51 and the film member 52 form a pumping recess 54 for pumping up the treatment liquid 22 (see FIG. 8). Accordingly, the hollow interior 53 of the squeeze roller 29 is sealed by the film member 52.

  As shown in FIG. 7, one end of a tube 61 is connected to the hollow interior 53 of the squeeze roller 29, and the other end 1 of the tube 6 is connected to an air pump 64 through a valve 63. In this embodiment, the valve 63 and the air pump 64 constitute pressure adjusting means for adjusting the pressure in the hollow interior 53 of the squeeze roller 29. An air pressure detecting means 62 is provided between the squeeze roller 29 and the valve 63.

  The pressure (internal pressure) inside the squeeze roller 29 is detected by the air pressure detecting means 62, and the pressure information is input to the controller 57. A pressure is set in advance in the controller 57, and when the pressure in the squeeze roller 29 is lower than the set pressure, a control signal is output from the controller 57 to the valve 63 and the air pump 64, and the valve 63. Is opened, the air pressurized by the air pump 64 is sent to the inside 53 of the squeeze roller 29, and the pressure inside the squeeze roller 29 is adjusted to a predetermined set pressure.

  When the pressure in the inside 53 of the squeeze roller 29 is increased, the portion (closed portion) of the film member 52 located in the hole 55 formed in the roller body 51 is pushed outward in the radial direction of the roller body 51. Thus, the volume of the pumping recess 54 for pumping up the processing agent liquid 22 is reduced, and the pumping amount of the processing agent liquid 22 by the squeeze roller 29 is reduced.

  FIG. 9 is an enlarged cross-sectional view showing a state in which the film member 52 is partially pushed outward in the radial direction (processing agent liquid 22 side) and the pumping amount of the processing agent liquid 22 is reduced.

  On the other hand, when the pressure information from the air pressure detecting means 62 (pressure in the inside 53 of the squeeze roller 29) is higher than the set pressure, the valve 63 is opened based on the control signal from the controller 57 and the inside 53 in the squeeze roller 29. The air in the squeeze roller 29 is reduced to the set pressure.

  When the pressure in the inside 53 of the squeeze roller 29 is reduced, the portion (closed portion) of the film member 52 located in the hole 55 of the roller body 51 is contracted radially inward of the roller body 51. Thus, the volume of the pumping recess 54 for pumping up the processing agent liquid 22 is increased, and the pumping amount of the processing agent liquid 22 by the squeeze roller 29 is increased.

  FIG. 10 is an enlarged cross-sectional view showing a state where the film member 52 is partially drawn inward in the radial direction and the pumping amount of the treatment liquid 22 is increased.

  Note that the set pressure value inside the squeeze roller 29 is preset for each type of recording medium W to be used (for example, material and thickness), and the relationship between the type of recording medium W and the set pressure value. Is stored in the controller 57.

FIG. 11 is a flowchart for explaining a series of operations of the treatment liquid coating apparatus according to the embodiment of the present invention.
First, in step (hereinafter abbreviated as S) 1, when an instruction to start the coating operation is issued from the controller 57, the pressure inside the squeeze roller 29 is detected by the air pressure detecting means 62 in S2, and the pressure information is obtained. Input to the controller 57.

  In the controller 57, the set pressure is read in advance depending on the type of the recording medium W to be used, and it is determined whether or not the detected pressure in the inside 53 of the squeeze roller 29 is within a preset pressure setting range ( S3) When the pressure inside the squeeze roller 29 is out of the pressure setting range, the pressure inside the squeeze roller 29 is adjusted by the pressure adjusting means (valve 63, air pump 64) (S4). Thereby, the pumping amount of the processing agent liquid 22 suitable for the type of the recording medium W is set.

  If the pressure inside the squeeze roller 29 is within the set range, then in S5, based on the detection signal from the liquid level detection sensor 27, whether the liquid level of the treatment liquid 22 in the supply pan 26 is equal to or higher than the control line. Is determined by the controller 57. When the liquid level of the processing agent liquid 22 is lower than the control line, the processing agent liquid 22 is supplied from the cartridge 21 to the supply pan 26 in S6.

  If the liquid level of the processing agent liquid 22 in the supply pan 26 is equal to or higher than the control line, the cleaner blade 40 and the metering blade 30 that have been waiting in S7 are rotated to impinge on the application roller 31 and the squeeze roller 29, respectively. Hit it.

  After the abutment of these blades 30 and 40 is completed, the application roller 31 and the squeeze roller 29 are rotated using the motors 32 and 28, respectively, in S8. When the application roller 31 and the squeeze roller 29 reach the prescribed driving speed, the shutter 39 is opened in S9, and preparation for applying the treatment liquid 22 is completed.

  Next, the eccentric cam 37 is rotated, the standby pressure roller 33 is moved to the application roller 31 side, and the recording medium W is nipped between the application roller 31 and conveyed. At the same time, the treatment liquid 22 on the application roller 31 is transferred onto the recording medium W (S10).

  FIG. 12 is a schematic configuration diagram for explaining a coating amount varying means in a coating means of a processing agent liquid coating apparatus according to another embodiment of the present invention, and FIG. 13 explains a series of operations of the processing agent liquid coating apparatus. It is a flowchart for.

  12 differs from the application amount variable means described with reference to FIG. 7 in that the film thickness of the processing agent liquid 22 applied to the surface of the application roller 31 by the squeeze roller 29 is detected. The detecting means 65 is provided and the controller 57 is connected thereto.

  The film thickness detecting means 65 is configured as an optical distance sensor, and can detect the film thickness of the treatment liquid 22.

Next, the control flow of the application amount varying means will be described with reference to FIG.
First, in S11, the liquid level detection sensor 27 detects the liquid level position of the processing agent liquid 22 in the supply pan 26, and in S12, the liquid level position (liquid amount) of the processing agent liquid 22 in the supply pan 26 exceeds the control line. It is determined whether or not. When the liquid level position of the processing agent liquid 22 is lower than the control line, the processing agent liquid 22 is supplied from the cartridge 21 to the supply pan 26 in S13.

  If the liquid level position (liquid amount) of the processing agent liquid 22 in the supply pan 26 is equal to or greater than the control line, the cleaner blade 40 is rotated against the application roller 31 in S14 and the metering blade 30 is rotated to squeeze. The application roller 31 and the squeeze roller 29 are rotated in step S15.

  When an instruction to start the coating operation is issued from the controller 57, the pressure inside the squeeze roller 29 is detected by the air pressure detecting means 62 in S 16, and the pressure information is input to the controller 57.

  In the controller 57, the set pressure is read in advance according to the type of the recording medium W to be used, and it is determined whether or not the detected pressure in the inside 53 of the squeeze roller 29 is within the set pressure setting range (S17). When the pressure inside the squeeze roller 29 is out of the pressure setting range, the pressure inside the squeeze roller 29 is adjusted by the pressure adjusting means (valve 63, air pump 64) (S18).

  For example, when it is desired to increase the pressure inside the squeeze roller 29, the volume of the pumping recess 54 in the squeeze roller 29 decreases, thereby reducing the pumping amount of the treatment liquid 22, and the surface of the coating roller 31. The film thickness of the applied treating agent liquid becomes thin. On the other hand, when the pressure inside the squeeze roller 29 is lowered, the volume of the pumping recess 54 in the squeeze roller 29 increases, thereby increasing the pumping amount of the processing agent liquid 22 to the surface of the coating roller 31. The coating film thickness of the applied treatment agent solution is increased.

  Next, in S19, the film thickness detecting means 65 is used to detect the film thickness of the processing agent liquid 22 applied to the surface of the application roller 31, and the actual processing agent liquid film thickness is set in advance. The controller 57 calculates whether or not it is within the thickness setting range and the difference between the actual processing agent liquid film thickness and the processing agent liquid film thickness set value. The processing agent liquid film thickness setting value (setting range) is set for each type of recording medium.

  Next, in S21, the controller 57 changes the internal pressure setting value (setting range) of the squeeze roller 29 based on the difference between the actual processing agent liquid film thickness and the processing agent liquid film thickness setting value, and the changed internal pressure. The set value (set range) is stored in the controller 57. If the actual processing agent film thickness is thinner than the film thickness setting value, change the internal pressure setting value (setting range) to a lowering direction, and conversely the actual processing agent liquid film thickness is thicker than the film thickness setting value. In such a case, the internal pressure set value (setting range) is increased. The change range of the internal pressure setting value is set in advance by the difference in film thickness.

  Based on the newly set internal pressure value of the squeeze roller 29, the pressure adjusting means (valve 63, air pump 64) is operated to adjust the pressure inside the squeeze roller 29 (S18).

  When the film thickness of the processing agent liquid 22 applied to the surface of the application roller 31 is adjusted within the set range, the shutter 39 is opened to complete the preparation for application (S22), and then the eccentric cam 37 rotates and the spring is rotated. The arm 34 is pulled by 36, and the pressure roller 33 sandwiches the recording medium W between the application roller 31 and transfers the treatment liquid 22 from the application roller 31 to the recording medium W. .

13: Application means,
22: Treatment solution
26: supply bread,
27: Liquid level detection sensor,
29: Squeeze roller,
31: Application roller
33: pressure roller,
51: Roller body,
52: Film member,
53: hollow interior,
54: Concavity for pumping,
55: hole,
56: Inner peripheral surface side opening,
57: Controller,
62: Air pressure detection means,
63: valve,
64: Air pump,
65: Film thickness detection means,
101: Treatment liquid application device,
102: Inkjet printer,
W: Recording medium.

JP 2001-194619 A

Claims (5)

A supply pan for storing the treatment liquid,
A squeeze roller that has a large number of recesses for pumping on the outer periphery and pumps up the processing liquid stored in the supply pan;
An application roller that contacts the outer periphery of the squeeze roller and transfers the treatment liquid pumped up by the squeeze roller to apply it onto the recording medium;
In a processing agent solution coating apparatus for an ink jet printer, provided with a pressure roller provided so as to face the coating roller and sandwiching and transporting the recording medium between the coating roller,
The squeeze roller has a hollow roller body that is not elastically deformed and has a large number of holes penetrating from the inner peripheral surface toward the outer peripheral surface, and is fixed to the inner peripheral surface of the roller main body to A film member having elasticity that closes the opening on the peripheral surface side is provided, and a recess for pumping is formed by the hole portion of the roller body and the film member,
The closed portion of the film member that closes the opening on the inner peripheral surface side of the hole is expanded and contracted by adjusting the pressure inside the roller body to adjust the volume of the pumping recess. A processing agent solution coating apparatus for an inkjet printer. A supply pan for storing the treatment liquid,
A squeeze roller that has a large number of recesses for pumping on the outer periphery and pumps up the processing liquid stored in the supply pan;
An application roller that contacts the outer periphery of the squeeze roller and transfers the application roller pumped up by the squeeze roller to apply it onto a recording medium;
In a processing agent solution coating apparatus for an ink jet printer, provided with a pressure roller provided so as to face the coating roller and sandwiching and transporting the recording medium between the coating roller,
The squeeze roller has a hollow roller body that is not elastically deformed and has a large number of holes penetrating from the inner peripheral surface toward the outer peripheral surface, and is fixed to the inner peripheral surface of the roller main body to A film member having elasticity that closes the opening on the peripheral surface side is provided, and a recess for pumping is formed by the hole portion of the roller body and the film member,
By expanding and contracting the closed portion of the film member closing the inner peripheral surface side opening of the hole by adjusting the pressure inside the roller body, the volume of the pumping recess is increased or decreased, An apparatus for applying a processing agent liquid for an ink jet printer, wherein the film thickness of the processing agent liquid transferred to the application roller is adjusted. In the processing agent liquid coating device for an inkjet printer according to claim 1 or 2,
Pressure detecting means for detecting the pressure inside the roller body;
Pressure adjusting means for adjusting the pressure inside the roller body;
With a controller that sets the internal pressure,
When the controller determines that the detected pressure detected by the pressure detecting means is out of the set internal pressure, the pressure adjusting means adjusts the internal pressure of the roller body to the set internal pressure. A processing agent liquid coating apparatus for an ink jet printer, characterized in that: The processing agent solution coating apparatus for an ink jet printer according to claim 3,
The processing liquid solution coating apparatus for an ink jet printer, wherein the set internal pressure is set according to a type of the recording medium. In an image forming system provided with a treatment liquid coating apparatus for an inkjet printer on the upstream side in the recording medium conveyance direction of the inkjet printer,
5. The image forming system according to claim 1, wherein the processing agent liquid coating apparatus for an ink jet printer is the processing liquid coating apparatus for an ink jet printer.