JP6668701B2 - Paper humidifier and image forming system - Google Patents

Description

  The present invention relates to a paper humidifier and an image forming system.

  Conventionally, a paper humidifier for humidifying a paper is known. The paper humidifier includes a pair of water boats for storing water, a pair of water supply rollers for pumping water stored in the pair of water boats, and a nip portion provided on a pair of water supply rollers and provided on a paper conveyance path. And a pair of humidifying rollers to be formed. The pair of humidifying rollers are in a state in which water is applied to the surface by water from the pair of water supply rollers, and the paper is humidified when passing through a nip formed by the pair of humidifying rollers (for example, Patent Document 1). reference).

JP 2012-24953 A

  Here, in the paper humidifying device described in Patent Literature 1, when the humidification amount for the paper is changed, for example, the transport speed of a pair of humidifying rollers is reduced. However, when the transport speed is reduced to increase the humidification amount of the sheet, it is necessary to extremely reduce the transport speed, which causes a decrease in productivity. For this reason, a paper humidifying device that can adjust the humidification amount of paper without reducing productivity is desired.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a sheet humidifying apparatus and an image forming system capable of adjusting a humidifying amount of a sheet without reducing productivity. Is to provide.

In order to achieve the above object, a paper humidifier according to the present invention is a paper humidifier that humidifies the paper by passing the paper through a nip formed by a pair of humidifying rollers coated with water. A plurality of pairs of water supply rollers for applying water to the pair of humidification rollers, and control means for controlling the amount of water to be applied to the pair of humidification rollers from each of the plurality of pairs of water supply rollers, It is characterized in that the control means controls the amount of water applied to the pair of humidification rollers by pressing or separating each of the plurality of pairs of water supply rollers with respect to the pair of humidification rollers. I do.

According to the paper humidifying device according to the present invention, in order to control the amount of water applied to the pair of humidifying rollers from each of the plurality of pairs of water supply rollers, the amount of water applied to the pair of humidifying rollers is controlled. It is possible to adjust the humidification amount of the paper without having to reduce the linear velocity when the paper is humidified. Therefore, it is possible to adjust the humidification amount for the sheet without lowering the productivity. Furthermore, according to this paper humidifying device, the amount of water applied to the pair of humidifying rollers is controlled by pressing or separating each of the plurality of pairs of water supplying rollers with respect to the pair of humidifying rollers. Therefore, the amount of water applied to the pair of humidifying rollers can be changed only by the pressing and separating control, and the humidifying amount can be adjusted by relatively simple control.

Further, the paper humidifier according to the present invention is a paper humidifier that humidifies the paper by passing the paper through a nip formed by a pair of humidifying rollers coated with water, wherein the pair of humidifiers A plurality of pairs of water supply rollers for applying water to the rollers, control means for controlling the amount of water to be applied to the pair of humidifying rollers from each of the plurality of pairs of water supply rollers, and the plurality of pairs of water supply And a water removing unit capable of individually removing moisture attached to each of the rollers , wherein the plurality of pairs of water supply rollers are provided in contact with the pair of humidifying rollers, and the control unit includes Of each of a plurality of pairs of water supply rollers, a water supply roller from which water is removed by the water removal means is selected, and water is removed from the selected water supply roller, And controlling the serial coating amount of water into the pair of humidifying rollers.

According to the paper humidifying device according to the present invention, in order to control the amount of water applied to the pair of humidifying rollers from each of the plurality of pairs of water supply rollers, the amount of water applied to the pair of humidifying rollers is controlled. It is possible to adjust the humidification amount of the paper without having to reduce the linear velocity when the paper is humidified. Therefore, it is possible to adjust the humidification amount for the sheet without lowering the productivity. Furthermore, according to this paper humidifier, by removing water from a selected one of the plurality of pairs of water supply rollers, the amount of water applied to the pair of humidification rollers is controlled. The amount of water applied to the pair of humidifying rollers can be changed only by the control, and the humidifying amount can be adjusted by relatively simple control.

  Further, in the paper humidifying apparatus according to the present invention, it is preferable that the plurality of pairs of water supply rollers have different surface roughness for each pair.

  According to this paper humidifying device, since a plurality of pairs of water supply rollers have different surface roughnesses for each pair, it is possible to vary the amount of water applied to the pair of humidification rollers for each water supply roller pair. It can contribute to finer adjustment of the humidification amount.

  Further, in the paper humidifying device according to the present invention, it is preferable that the control unit makes the amount of applied water different between one and the other of the pair of humidifying rollers.

  According to this paper humidifying device, the amount of applied moisture is made different between one and the other of the pair of humidifying rollers, so that the humidifying amount of the paper can be controlled such that one side is increased and the other side is decreased. Can contribute to coordination.

  Further, in the paper humidifying apparatus according to the present invention, it is preferable that the plurality of pairs of water supply rollers are solid type rollers.

  According to this paper humidifier, the plurality of pairs of water supply rollers are solid-type rollers, so that the roller durability can be improved.

  Further, an image forming system according to the present invention includes: the sheet humidifier according to any one of the above, and an image forming apparatus that forms an image on a sheet and supplies the image to the sheet humidifier. Features.

  ADVANTAGE OF THE INVENTION According to the image forming system which concerns on this invention, the image forming system which can adjust the humidification amount with respect to a paper, without reducing productivity can be provided.

  According to the present invention, it is possible to provide a paper humidifying apparatus and an image forming system that can adjust the humidification amount of paper without reducing productivity.

1 is a schematic configuration diagram illustrating an image forming system including a paper humidifying device according to a first embodiment of the present invention. FIG. 2 is a configuration diagram illustrating details of a paper humidifying unit illustrated in FIG. 1. FIG. 3 is a first diagram illustrating the operation of the paper humidifying unit illustrated in FIG. 2. FIG. 3 is a second diagram illustrating the operation of the paper humidifying unit illustrated in FIG. 2. 5 is a graph showing the relationship between the surface roughness of a water supply roller and the water content of paper. FIG. 4 is a diagram illustrating an example of data stored in a control unit. 4 is a flowchart illustrating a paper humidification method by the paper humidification device according to the embodiment. It is a lineblock diagram showing details of a sheet humidification part concerning a 2nd embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

  FIG. 1 is a schematic configuration diagram illustrating an image forming system including a paper humidifying device according to the first embodiment of the present invention. The image forming system 1 illustrated in FIG. 1 includes an image forming apparatus A and a post-processing apparatus B that performs post-processing on a sheet S on which an image is formed by the image forming apparatus A.

  The image forming apparatus A is a tandem-type color type that forms a full-color image on a sheet S by arranging a plurality of photoconductors in a vertical direction so as to face a single intermediate transfer belt. 1 has an image reading device 2 including an automatic document feeder and a scanning exposure device, and has an image forming section 3 and a plurality of paper feed trays 4 at a lower portion.

  The image reading apparatus 2 conveys a document placed on a document tray of an automatic document feeder by a conveyance section, scans and exposes an image on one side or both sides of the document, and reads image information. The image reading device 2 is also configured to read image information of a document placed on a contact glass.

  The image forming unit 3 receives the supply of the paper S from the plurality of paper feed trays 4, and based on image information read by the image reading device 2 or image information transmitted from a personal computer (PC) or the like. Thus, an image is formed on the sheet S.

  The image forming section 3 includes an image transfer section 3a and a fixing section 3b. The image transfer unit 3a forms a toner image on a photoconductor by an electrophotographic process of charging, exposing, and developing, and transfers the image to a sheet S. In the present embodiment, the image transfer unit 3a is of a type having an intermediate transfer belt, and the toner images on the plurality of photoconductors are transferred to the intermediate transfer belt, and the toner images on the intermediate transfer belt are transferred to the paper S. You.

  The fixing section 3b forms a nip section for transporting the paper S with a heating roller and a pressure roller, and heats and pressurizes the paper S while transporting the paper S to melt the toner, and transfers the toner to the paper S by the image transfer section 3a. The fixed image is fixed on the sheet S.

  Further, the image forming apparatus A includes a reversing path 5 that extends from the downstream side of the fixing unit 3b to the upstream side of the image transfer unit 3a. The reversing path 5 is a path for reversing the sheet S and re-conveying the sheet S to the image transfer unit 3a. The reversing path 5 enables the front and back images to be formed on the sheet S.

  The post-processing device B performs cutting (including punching), humidification, folding, and stapling of the sheet S. The post-processing device B includes various routes R1 and R2, a paper discharge tray Tr, a paper humidifying unit C, and a control unit (control means) 50. The paper humidifier C and the controller 50 constitute a paper humidifier.

  The first path R1 is a path for receiving the sheet S on which an image is formed and transporting the sheet S to the sheet humidifying section C, and the second path R2 is a path for transporting the sheet S passing through the sheet humidifying section C to the sheet discharge tray Tr. It is. Here, the sheet S on which an image is formed by the image forming apparatus A is in a charged state, and the charged sheet S causes various inconveniences. For this reason, the paper humidifier humidifies the paper S on which an image is formed.

  In the present embodiment, the second path R2 guides the sheet S to the sheet discharge tray Tr, but a folding mechanism, a stapling mechanism, or the like may be provided on the second path R2. Also, another mechanism such as a cutting mechanism may be provided in the first route R1.

  FIG. 2 is a configuration diagram showing details of the paper humidifying unit C shown in FIG. The paper humidifying unit C shown in FIG. 2 humidifies the paper S by passing the paper S through a nip portion N formed by a pair of humidifying rollers 10 to which moisture is applied. The paper humidifying unit C includes a plurality of pairs (two pairs) of water boats 20, a plurality of pairs (two pairs) of water supply rollers 30, and a pair of drainage rollers 40 in addition to the pair of humidification rollers 10. ing. The pair of components 10, 20, 30, and 40 are arranged symmetrically with respect to the transport path R. Further, in this embodiment, an example in which the water boat 20 and the water supply roller 30 are two pairs will be described. However, the present invention is not limited to two pairs, and may be configured with three or more pairs.

  The plurality of pairs of watercrafts 20 store water, and each of the watercrafts 20 is formed in an arc shape in cross section along the outer periphery of the water supply roller 30. The plurality of pairs of water supply rollers 30 are partially immersed in the water stored in each watercraft 20, and are configured to pump up the water of the watercraft 20 with their own rotation. . The plurality of pairs of water supply rollers 30 contact the pair of humidification rollers 10 to apply water to the pair of humidification rollers 10 as they rotate.

  The pair of drainage rollers 40 is a water amount limiting member that limits the amount of water held by the plural pairs of water supply rollers 30. The draining roller 40 is rotatably supported, and restricts the amount of water retained on the surface of the water supply roller 30 by coming into contact with the water supply roller 30 or in a state where there is a gap. For this reason, the humidifying roller 10 is applied with a limited amount of water by the draining roller 40. In addition, the draining roller 40 is not limited to a roller-shaped member rotatably supported, and may be configured by, for example, a plate-shaped member.

  Here, the plurality of pairs of water supply rollers 30 are constituted by hydrophilic solid type rollers. The hydrophilic solid type roller is, for example, a rubber roller (particularly a nitrile rubber roller) or a metal roller that has been subjected to a hydrophilic treatment, and has a small hole for retaining moisture like a porous member. The roller is not configured.

  Further, the plurality of pairs of water supply rollers 30 have different surface roughness for each pair. Specifically, the surface roughness of the first pair of water supply rollers 30a is 15 μm, and the surface roughness of the second pair of water supply rollers 30b is 25 μm. When the water supply roller 30 is a rubber roller, the surface roughness can be adjusted by polishing the roller surface. When the water supply roller 30 is a metal roller, it can be adjusted by controlling thermal spraying. Can be.

  FIG. 1 is referred to again. The control unit 50 is configured to communicate with the control unit 6 of the image forming apparatus A, and acquires information of the sheet S necessary for controlling the sheet humidifying unit C from the image forming apparatus A. The information on the paper S to be acquired is, for example, information on the paper type of the paper S, information on the basis weight, and information on the image density (print rate) formed on the paper S.

  Further, the control unit 50 controls the amount of water to be applied to the pair of humidifying rollers 10 from each of the plurality of pairs of water supply rollers 30 based on the information of the paper S. For example, when the paper type of the paper S is a coated paper or the like, it is difficult to obtain the static elimination effect unless the humidification amount is increased. Further, as the basis weight of the paper S increases, the thickness of the paper S increases, so that it is difficult to obtain the static elimination effect unless the humidification amount is increased. In addition, the higher the image density (printing rate) of the paper S, the more the paper S is charged. Therefore, it is necessary to increase the amount of humidification in order to appropriately remove electricity. As described above, the control unit 50 controls the amount of water to be applied to the pair of humidifying rollers 10 from each of the plurality of pairs of water supply rollers 30 based on the information of the sheet S.

  Here, in the paper humidifying device according to the present embodiment, the plurality of pairs of water supply rollers 30 are configured to be able to press against and separate from the pair of humidification rollers 10. For this reason, the control unit 50 controls the amount of application to the pair of humidifying rollers 10 by pressing and separating each of the plurality of pairs of water supply rollers 30.

  FIG. 3 is a first diagram showing the operation of the paper humidifying unit C shown in FIG. As shown in FIG. 3, the control unit 50 separates the first pair of water supply rollers 30 a from the pair of humidification rollers 10 and presses the second pair of water supply rollers 30 b against the pair of humidification rollers 10. Thereby, the control unit 50 controls the application amount from the first pair of water supply rollers 30a to zero, and reduces the application amount from the second pair of water supply rollers 30b to the application amount controlled by the draining roller 40. Control.

  FIG. 4 is a second diagram illustrating the operation of the paper humidifying unit C illustrated in FIG. As shown in FIG. 4, the control unit 50 presses the first pair of water supply rollers 30 a against the pair of humidification rollers 10 and separates the second pair of water supply rollers 30 b from the pair of humidification rollers 10. . Thereby, the control unit 50 controls the application amount from the first pair of water supply rollers 30a to the application amount controlled by the draining roller 40, and reduces the application amount from the second pair of water supply rollers 30b to zero. Control.

  FIG. 5 is a graph showing the relationship between the surface roughness of the water supply roller 30 and the water content of the paper S. As shown in FIG. 5, it is assumed that the water content of the paper S when the paper S (high-quality paper 157 gsm) is not humidified is 6.0%. In this case, as shown in FIG. 3, when only the first pair of water supply rollers 30a is pressed against the pair of humidification rollers 10 to humidify the paper S, the water content of the paper S is about 9.0%. . Further, as shown in FIG. 4, when only the second pair of water supply rollers 30b is pressed against the pair of humidifying rollers 10 to humidify the paper S, the moisture content of the paper S becomes more than 10.0%.

  As described above, the control unit 50 controls the pressure contact and separation of the first and second pair of water supply rollers 30 having different surface roughnesses, thereby controlling the first and second pair of water supply rollers 30 from the pair of humidification rollers. Control the amount of water applied to 10. Then, the control unit 50 controls the humidification amount of the paper S by controlling the amount of water applied to the pair of humidification rollers 10.

  Further, the control unit 50 stores the data shown in FIG. 6, and performs the pressure contact / separation control based on the data. FIG. 6 is a diagram illustrating an example of data stored in the control unit 50. As shown in FIG. 6, the control unit 50 determines whether the paper type of the paper S is “thin paper”, “plain paper”, or “thick paper or coated paper” based on the information from the control unit 6. In the stored data, when the paper type of the paper S is “thin paper”, “humidification amount is small”, and when the paper type of the paper S is “plain paper”, “humidification amount is medium”. When the paper type of the paper S is “thick paper or coated paper”, “humidification amount is large”.

  Similarly, the control unit 50 determines whether the basis weight of the paper S is “large”, “medium”, or “small” based on the information from the control unit 6. At this time, the control unit 50 determines whether the basis weight of the paper S is “large”, “medium”, or “small” based on the two thresholds. In the stored data, when the basis weight of the paper S is “large”, “humidification amount is large”, and when the basis weight of the paper S is “medium”, “humidification amount is medium”. When the basis weight of the paper S is “small”, it is determined that “humidification amount is small”.

  Similarly, the control unit 50 determines whether the image density of the sheet S is “dark”, “normal”, or “light” based on the information from the control unit 6. At this time, the control unit 50 determines whether the image density of the sheet S is “dark”, “normal”, or “light” based on the two thresholds. In the stored data, when the image density of the sheet S is “dark”, “humidification amount is large”, and when the image density of the sheet S is “normal”, “humidification amount is medium”. When the image density of the paper S is “light”, the humidification amount is “small”.

  The control unit 50 performs pressure contact / separation control based on such stored data. For example, the control unit 50 sets “high humidification amount” = “3 points”, “medium humidification amount” = “2 points”, “low humidification amount” = “1 point”, and sets the paper type, basis weight and Pressure contact / separation control is performed according to the total number of points obtained by adding all the points of the image density. For example, the control unit 50 presses both the first and second pair of water supply rollers 30a and 30b against the pair of humidification rollers 10 with the total number of points being 8 or 9 points. Thereby, the humidification amount of the sheet S is increased. Similarly, the control unit 50 presses only the second pair of water supply rollers 30b against the pair of humidification rollers 10 with the total number of points being 6 or 7 points. Thereby, the humidification amount of the sheet S is made relatively large. In addition, the control unit 50 presses only the first pair of water supply rollers 30 a against the pair of humidification rollers 10 with the total number of points being 4 or 5 points. Thereby, the humidification amount of the sheet S is made relatively small. Further, the control unit 50 separates the first and second pair of water supply rollers 30a and 30b from the pair of humidification rollers 10 with the total number of points being three points. Thus, the humidification amount of the paper S is not performed.

  Note that the pair of humidifying rollers 10 may be configured to be able to press and separate from each other, and if it is determined that humidification is not performed, the control unit 50 may separate the pair of humidifying rollers 10. If a bypass route from the first route R1 to the second route R2 bypassing the paper humidifying unit C is provided in the post-processing device B, and if it is determined that humidification is not to be performed, the control unit 50 sets the bypass route to The paper S may be conveyed by utilizing it.

  Next, a paper humidification method by the paper humidification device according to the present embodiment will be described. FIG. 7 is a flowchart illustrating a paper humidification method by the paper humidification device according to the present embodiment. As shown in FIG. 7, first, the control unit 50 acquires information on the paper S (S1). In this process, the control unit 50 acquires information on the paper type, basis weight, and image density of the paper S from the control unit 6 of the image forming apparatus A.

  Next, based on the information on the paper type, basis weight, and image density of the paper S, the control unit 50 controls the water supply roller 30 of the plurality of pairs to be in pressure contact with the pair of humidification rollers 10 and to be separated from each other. Is determined (S2). At this time, the control unit 50 determines, based on the data described with reference to FIG. 6, for example, what is to be pressed and which is to be separated.

  Next, the control unit 50 controls the plurality of pairs of the water supply rollers 30 under pressure contact and separation based on the content of the determination in step S2 (S3). Thereafter, the processing illustrated in FIG. 7 ends. The process shown in FIG. 7 is repeatedly executed each time the information of the sheet S input from the control unit 6 is changed.

  In this way, according to the paper humidifying apparatus and the image forming system 1 according to the first embodiment, the amount of water applied to each of the pair of humidifying rollers 10 from each of the plurality of pairs of water supplying rollers 30 is controlled. The amount of water applied to the pair of humidifying rollers 10 can be changed, and the humidification amount for the paper S can be adjusted without having to reduce the linear velocity when the paper S is humidified. Therefore, the humidification amount for the paper S can be adjusted without lowering the productivity.

  Further, the application amount of water to the pair of humidifying rollers 10 is controlled by pressing or separating each of the plurality of pairs of the water supply rollers 30 with respect to the pair of humidifying rollers 10. Therefore, the amount of water applied to the pair of humidifying rollers 10 can be changed only by the pressing and separating control, and the humidifying amount can be adjusted by relatively simple control.

  In addition, since the plurality of pairs of water supply rollers 30 have different surface roughnesses for each pair, the amount of water applied to the pair of humidification rollers 10 can be made different for each water supply roller pair, so that more finer It can contribute to the adjustment of the humidification amount.

  Further, since the plural pairs of water supply rollers 30 are solid type rollers, the roller durability can be improved. In particular, according to the technique described in JP-A-2006-118863, the amount of water applied to the pair of humidifying rollers is controlled by controlling the nip pressure between the pair of water supplying rollers and the pair of humidifying rollers. However, with this configuration, a porous roller is used as a water supply roller or the like, and the durability of the porous roller is reduced due to the properties of the porous roller. However, in the above embodiment, since the amount of water applied is controlled by controlling the pressure contact and the separation, there is no restriction that a porous roller must be used, and the durability can be improved by using a solid type roller. .

  Next, a second embodiment of the present invention will be described. The paper humidifying apparatus according to the second embodiment is the same as that of the first embodiment, but is partially different in configuration and processing. Hereinafter, differences from the second embodiment will be described.

  FIG. 8 is a configuration diagram illustrating details of the paper humidifying unit C according to the second embodiment. As shown in FIG. 8, the paper humidifying unit C according to the second embodiment includes a plurality of pairs (two pairs) of draining rollers (water removing means) 40. A plurality of pairs of drainage rollers 40 are provided, one for each water supply roller 30, respectively, and can individually remove moisture adhering to each of the plurality of pairs of water supply rollers 30.

  In the second embodiment, a plurality of pairs of water supply rollers 30 are provided in contact with the pair of humidification rollers 10. That is, the plural pairs of water supply rollers 30 are always in contact with the pair of humidification rollers 10.

  In addition, the plurality of pairs of drainage rollers 40 are configured to be capable of pressing and separating from each of the water supply rollers 30, and are configured to remove water from the water supply rollers 30 at the time of pressing.

  Further, in the second embodiment, the control unit 50 selects the water supply roller 30 from which water is removed by the plurality of pairs of water supply rollers 40 out of each of the plurality of pairs of water supply rollers 30, and drains water to the selected water supply roller 30. The roller 40 is pressed. Thus, the control unit 50 controls the amount of water applied to the pair of humidifying rollers 10 by removing water from the selected water supply roller 30.

  Next, a paper humidification method by the paper humidifier according to the second embodiment will be described. First, the control unit 50 acquires information on the paper type, basis weight, and image density of the paper S from the control unit 6 of the image forming apparatus A. Next, the control unit 50 selects the water supply roller 30 from which water is removed based on the data shown in FIG. Next, the control unit 50 presses the draining roller 40 against the selected water supply roller 30. On the other hand, the control unit 50 separates the draining roller 40 from the unselected water supply roller 30.

  As described above, the control unit 50 controls the amount of water to be applied to the pair of humidifying rollers 10 from each of the plurality of pairs of water supply rollers 30.

  In this way, according to the sheet humidifying apparatus and the image forming system 1 according to the second embodiment, the humidification amount for the sheet S can be adjusted without lowering the productivity, as in the first embodiment. The plurality of pairs of water supply rollers 30 having different surface roughnesses for each pair can contribute to finer adjustment of the humidification amount. Further, durability can be improved by using a solid type roller.

  Further, according to the second embodiment, by removing water from a selected one of the plurality of pairs of water supply rollers 30, the amount of water applied to the pair of humidification rollers 10 is controlled. The amount of water to be applied to the pair of humidifying rollers 10 can be changed only by the pressure contact / separation control of the roller 40, and the humidifying amount can be adjusted by relatively simple control.

  As described above, the paper humidifying apparatus and the image forming system according to the present invention have been described based on the embodiments. However, the present invention is not limited thereto, and may be modified without departing from the spirit of the present invention. Alternatively, if possible, the techniques described in the embodiments or known techniques may be combined.

  For example, in the above-described embodiment, the control unit 50 controls the amount of water to be applied from each of the plurality of pairs of water supply rollers 30 to the pair of humidifying rollers 10. And the other may be different. For example, when the image density is greatly different between the front and back sides of the sheet S, the humidification amount for the sheet S can be controlled to be large on one side and small on the other side, and finer adjustment of the humidification amount can be performed. .

  Further, in the second embodiment, when a plurality of pairs of the draining rollers 40 and a plurality of pairs of the water supply rollers 30 are separated from each other, the gap between them may be finely adjustable. Thereby, the water removal amount of each of the plural pairs of water supply rollers 30 can be adjusted, and the humidification amount of the paper S can be more finely adjusted.

  Further, in the above embodiment, the sheet humidifying device is incorporated in the post-processing device B connected to the subsequent stage of the image forming device A. However, the present invention is not limited to this. S may be applied to an offline finisher that performs post-processing alone. In this case, the offline finisher may be provided with a unit for acquiring information on the paper S.

1: Image forming system 2: Image reading device 3: Image forming unit 3a: Image transfer unit 3b: Fixing unit 4: Feed tray 5: Reversing path 6: Control unit 10: A pair of humidifying rollers 20: A plurality of pairs of water boats 30: a plurality of pairs of water supply rollers 30a: a first pair of water supply rollers 30b: a second pair of water supply rollers 40: a pair (a plurality of pairs) of draining rollers 50: a control unit (control means)
A: image forming apparatus B: post-processing apparatus C: sheet humidifying section N: nip section R: transport path S: sheet Tr: sheet discharge tray

Claims (6)

A paper humidifier that humidifies the paper by passing the paper through a nip formed by a pair of humidifying rollers to which water is applied,
A plurality of pairs of water supply rollers that apply water to the pair of humidification rollers,
Control means for controlling the amount of water to be applied to the pair of humidifying rollers from each of the plurality of pairs of water supply rollers ,
The control unit is characterized in that the plurality of pairs of water supply rollers are provided so as to control the amount of water applied to the pair of humidification rollers by pressing or separating the pair of humidification rollers from or to the pair of humidification rollers. Paper humidifier. A paper humidifier that humidifies the paper by passing the paper through a nip formed by a pair of humidifying rollers to which water is applied,
A plurality of pairs of water supply rollers that apply water to the pair of humidification rollers,
Control means for controlling the amount of water applied to the pair of humidifying rollers from each of the plurality of pairs of water supply rollers,
Water removal means capable of individually removing water attached to each of the plurality of pairs of water supply rollers,
The plurality of pairs of water supply rollers are provided in contact with the pair of humidification rollers,
The control unit selects a water supply roller from which the water is removed by the water removal unit among the plurality of water supply rollers, and removes water from the selected water supply roller, to the pair of humidification rollers. A paper humidifier that controls the amount of water applied . It said plurality of pairs dampening roller of the sheet moisturizing device of any one of claims 1 or claim 2, characterized in that the surface roughness for each pair is different. 4. The paper humidifying apparatus according to claim 1 , wherein the control unit causes the amount of applied moisture to be different between one and the other of the pair of humidifying rollers. 5. The paper humidifier according to any one of claims 1 to 4 , wherein the plurality of pairs of water supply rollers are solid type rollers. A paper humidifier according to any one of claims 1 to 5 ,
An image forming apparatus that forms an image on a sheet and supplies the image to the sheet humidifier;
An image forming system comprising:

Images