JP2017095205A - Sheet humidifier and image formation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet humidifier and an image formation system which can adjust the humidification amount to a sheet without reducing the productivity.SOLUTION: A sheet humidifier which humidifies a sheet S with the passage of the sheet S through a nip part N formed by a pair of humidification rollers 10 applied with moisture content includes: plural pairs of water supply rollers 30 which apply water to the pair of humidification rollers 10; and a control unit which controls the application amount of moisture content applied to the pair of humidification rollers 10 from each of the plural pairs of water supply rollers 30.SELECTED DRAWING: Figure 2

Description

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

  2. Description of the Related Art Conventionally, a paper humidifier that humidifies paper is known. This paper humidifier is provided with a pair of water vessels for storing water, a pair of water supply rollers for pumping up water stored in the pair of water vessels, and a pair of water supply rollers, and a nip portion on the paper conveyance path. And a pair of humidifying rollers to be formed. The pair of humidification rollers are in a state where water is applied to the surface by water from the pair of water supply rollers, and the paper is humidified when passing through the nip portion formed by the pair of humidification rollers (for example, Patent Document 1). reference).

JP 2010-163324 A

  Here, in the paper humidification device described in Patent Document 1, when changing the humidification amount for the paper, for example, the conveyance speed of a pair of humidification rollers is reduced. However, when the conveyance speed is lowered to increase the amount of humidification of the paper, it is necessary to extremely slow the conveyance speed, leading to a decrease in productivity. For this reason, there is a demand for a paper humidifier that can adjust the amount of humidification of paper without reducing productivity.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sheet humidifying device and an image forming system capable of adjusting a humidification amount for 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 that apply water to the pair of humidification rollers, and a control unit that controls the amount of moisture applied to the pair of humidification rollers from each of the plurality of pairs of water supply rollers; It is characterized by providing.

  According to the paper humidifier according to the present invention, the amount of moisture applied to the pair of humidifying rollers is controlled in order to control the amount of moisture applied from each of the plurality of pairs of water supply rollers to the pair of humidifying rollers. Therefore, it is not necessary to reduce the linear speed when the paper is humidified, and the humidification amount for the paper can be adjusted. Therefore, it is possible to adjust the humidification amount for the paper without reducing the productivity.

  Further, in the paper humidifying device according to the present invention, the control means applies the moisture to the pair of humidifying rollers by pressing or separating the plurality of pairs of water supply rollers with respect to the pair of humidifying rollers, respectively. It is preferred to control the amount.

  According to this sheet humidifying device, the amount of moisture applied to the pair of humidifying rollers is controlled by pressing or separating each of the plurality of pairs of water supply rollers with respect to the pair of humidifying rollers. For this reason, the amount of moisture applied to the pair of humidifying rollers can be changed only by the pressure contact and separation control, and the amount of humidification can be adjusted by relatively simple control.

  Further, in the paper humidifying device according to the present invention, the paper humidifier further includes moisture removing means capable of individually removing moisture adhering to each of the plurality of pairs of water supply rollers, and the plurality of pairs of water supply rollers includes the pair of humidification rollers. The control means is provided in contact with a roller, and the control means selects a water supply roller from which water is removed by the water removal means among each of the plurality of pairs of water supply rollers, and removes water from the selected water supply roller. Therefore, it is preferable to control the amount of moisture applied to the pair of humidifying rollers.

  According to this paper humidifier, in order to control the amount of moisture applied to the pair of humidification rollers by removing the moisture from the selected water supply roller of each of the plurality of pairs of water supply rollers, only the control of the moisture removal means Thus, the amount of moisture applied to the pair of humidifying rollers can be changed, and the amount of humidification can be adjusted with relatively simple control.

  In the paper humidifier 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 humidifier, since the plurality of pairs of water supply rollers have different surface roughness for each pair, the amount of moisture applied to the pair of humidification rollers can be made different for each pair of water supply rollers. Can contribute to finer adjustment of the humidification amount.

  In the sheet humidifying apparatus according to the present invention, it is preferable that the control unit varies the amount of moisture applied between one and the other of the pair of humidifying rollers.

  According to this paper humidifier, since the amount of moisture applied is different between one and the other of the pair of humidifying rollers, the amount of humidification of the paper can be controlled with one side being increased and the other side being reduced. Can contribute to the adjustment.

  In the paper humidifier 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, since a plurality of pairs of water supply rollers are solid type rollers, it is possible to improve roller durability.

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

  According to the image forming system of the present invention, it is possible to provide an image forming system capable of adjusting the humidification amount for the paper without reducing the productivity.

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

1 is a schematic configuration diagram illustrating an image forming system including a paper humidifier according to a first embodiment of the present invention. It is a block diagram which shows the detail of the paper humidification part shown in FIG. FIG. 3 is a first diagram illustrating an operation of a sheet humidifying unit illustrated in FIG. 2. FIG. 6 is a second diagram illustrating the operation of the sheet humidifying unit illustrated in FIG. 2. It is a graph which shows the relationship between the surface roughness of a water supply roller, and the moisture content of a paper. It is a figure which shows an example of the memory | storage data of a control part. It is a flowchart which shows the paper humidification method by the paper humidification apparatus which concerns on this embodiment. It is a block diagram which shows the detail of the paper humidification part which concerns on 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 humidifier according to the first embodiment of the present invention. An 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 color type that forms a full-color image on the paper S by arranging a plurality of photoconductors facing a single intermediate transfer belt in the vertical direction, 1 includes an image reading device 2 including an automatic document feeder and a scanning exposure device, and includes an image forming unit 3 and a plurality of paper feed trays 4 at a lower portion.

  The image reading device 2 transports a document placed on a document tray of an automatic document transport device by a transport unit, scans and exposes an image on one 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 the contact glass.

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

  The image forming unit 3 includes an image transfer unit 3a and a fixing unit 3b. The image transfer unit 3a forms a toner image on the photosensitive member by an electrophotographic process that performs charging, exposure, and development, and transfers the image to the paper S. In the present embodiment, the image transfer unit 3a is of a type having an intermediate transfer belt, toner images on a plurality of photoconductors are transferred to the intermediate transfer belt, and toner images on the intermediate transfer belt are transferred to the paper S. The

  The fixing unit 3b forms a nip portion that transports the paper S with a heating roller and a pressure roller, melts the toner by heating and pressurizing while transporting the paper S, and transfers the toner onto the paper S by the image transfer unit 3a. The printed image is fixed on the paper S.

  Further, the image forming apparatus A includes a reversing path 5 that leads from the downstream side of the fixing unit 3b to the upstream side of the image transfer unit 3a. The reverse path 5 is a path for re-transporting the paper S to the image transfer unit 3a after reversing the front and back of the paper S. By this reversal path 5, front and back images can be formed on the paper S.

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

  The first path R1 is a path for receiving the image-formed paper S and transporting it to the paper humidifying section C, and the second path R2 is a path for transporting the paper S that has passed through the paper humidifying section C to the paper 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 sheet humidifying device humidifies the sheet S on which the image is formed.

  In the present embodiment, the second path R2 guides the paper S to the paper 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 sheet humidifying unit C shown in FIG. The sheet humidifying unit C shown in FIG. 2 humidifies the sheet S as the sheet S passes through a nip N formed by a pair of humidifying rollers 10 coated with moisture. In addition to the pair of humidifying rollers 10, the sheet 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 draining rollers 40. ing. The pair of components 10, 20, 30, and 40 are arranged symmetrically with the conveyance path R in between. In the present 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 by three or more pairs.

  The plurality of pairs of water ships 20 store water, and each of them is formed in a circular arc shape along the outer periphery of the water supply roller 30. Each of the plurality of pairs of water supply rollers 30 is in a state where a part of each of the water supply rollers 30 is immersed in the water stored in each water boat 20, and is configured to pump water from the water boat 20 as it rotates itself. . Further, the plurality of pairs of water supply rollers 30 are in contact with the pair of humidifying rollers 10, thereby applying water to the pair of humidifying rollers 10 along with their rotation.

  The pair of draining rollers 40 are water amount limiting members that limit the amount of water held by the multiple pairs of water supply rollers 30. The draining roller 40 is rotatably supported and restricts the amount of water held on the surface of the water supply roller 30 by being close to the water supply roller 30 in contact with or with a gap. For this reason, the amount of water limited by the draining roller 40 is applied to the humidifying roller 10. The draining roller 40 is not limited to a roller-like member that is rotatably supported, and may be constituted by, for example, a plate-like member.

  Here, the plurality of pairs of water supply rollers 30 are composed of hydrophilic solid type rollers. A hydrophilic solid type roller is, for example, a rubber roller (especially 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. It is a roller with a configuration that does not

  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. In addition, about the surface roughness, when the water supply roller 30 is a rubber roller, it can be adjusted by grind | polishing the roller surface, and when the water supply roller 30 is a metal roller, it adjusts by controlling thermal spraying. Can do.

  Reference is again made to FIG. The control unit 50 is configured to communicate with the control unit 6 of the image forming apparatus A, and acquires information on 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 image density (printing rate) formed on the paper S.

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

  Here, in the paper humidifier according to the present embodiment, the plurality of pairs of water supply rollers 30 are configured to be capable of being pressed and separated from the pair of humidifying rollers 10. For this reason, the control part 50 controls the application quantity with respect to a pair of humidification roller 10 by making each of several pairs of water supply roller 30 press-contact and space apart.

  FIG. 3 is a first diagram illustrating the operation of the sheet humidifying unit C illustrated in FIG. As shown in FIG. 3, the controller 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 part 50 controls the application amount from the 1st pair of water supply roller 30a to zero, and sets the application amount from the 2nd pair of water supply roller 30b to the application amount controlled by the draining roller 40. Control.

  FIG. 4 is a second diagram illustrating the operation of the sheet 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 part 50 controls the application quantity from the 1st pair of water supply roller 30a to the application quantity controlled by the draining roller 40, and makes the application quantity from the 2nd pair of water supply roller 30b zero. Control.

  FIG. 5 is a graph showing the relationship between the surface roughness of the water supply roller 30 and the moisture content of the paper S. As shown in FIG. 5, it is assumed that the moisture content of the sheet S when the sheet S (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 30 a is brought into pressure contact with the pair of humidifying rollers 10 to humidify the sheet S, the moisture content of the sheet S is about 9.0%. . Furthermore, as shown in FIG. 4, when only the second pair of water supply rollers 30b is brought into pressure contact with the pair of humidifying rollers 10 to humidify the sheet S, the moisture content of the sheet S exceeds 10.0%.

  As described above, the control unit 50 presses and separates the first and second pair of water supply rollers 30 having different surface roughnesses, thereby controlling the pair of humidification rollers from the first and second pair of water supply rollers 30. The amount of moisture applied to 10 is controlled. The control unit 50 controls the humidification amount of the paper S by controlling the amount of moisture applied to the pair of humidification rollers 10.

  Further, the control unit 50 stores the data shown in FIG. 6 and performs pressure contact separation control based on this 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 information from the control unit 6. In the stored data, when the paper type of the paper S is “thin paper”, the “humidification amount is small”, and when the paper type of the paper S is “plain paper”, “the humidification amount is”. When the paper type of the paper S is “thick paper or coated paper”, the “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 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 two threshold values. Further, in the stored data, “high humidification amount” is set when the basis weight of the paper S is “large”, and “high humidification amount” is set when the basis weight of the paper S is “medium”. When the basis weight of the paper S is “small”, the “humidification amount is small”.

  Further, similarly, the control unit 50 determines whether the image density of the paper S is “deep”, “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 paper S is “deep”, “normal”, or “light” based on the two threshold values. Further, in the stored data, “high humidification amount” is set when the image density of the paper S is “dark”, and “medium humidification amount” is set when the image density of the paper S is “normal”. When the image density of the paper S is “light”, the “humidification amount is small”.

  The control unit 50 performs press-contact separation control based on such stored data. As an example, the control unit 50 sets “high humidification amount” = “3 points”, “medium humidification amount” = “2 points”, “small humidification amount” = “1 point”, 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 has a total number of points of 8 or 9 and presses both the first and second pair of water supply rollers 30 a and 30 b against the pair of humidifying rollers 10. Thereby, the humidification amount of the paper S is increased. Similarly, the control unit 50 presses only the second pair of water supply rollers 30b against the pair of humidifying rollers 10 with the total number of points being 6 or 7 points. Thereby, the humidification amount of the paper S is relatively increased. Further, the control unit 50 presses only the first pair of water supply rollers 30 a against the pair of humidifying rollers 10 with the total number of points being 4 or 5 points. Thereby, the humidification amount of the paper S is relatively reduced. Furthermore, 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 a total number of points of three points. Accordingly, the humidification amount to the paper S is not performed.

  Note that the pair of humidifying rollers 10 may be configured to be press-contacted and separated, and when it is determined that humidification is not performed, the control unit 50 may separate the pair of humidifying rollers 10. When the post-processing device B is provided with a detour path that bypasses the sheet humidification unit C from the first path R1 and reaches the second path R2, and determines that the humidification is not performed, the control unit 50 determines the detour path. The sheet S may be conveyed by using it.

  Next, a paper humidification method by the paper humidifier according to the present embodiment will be described. FIG. 7 is a flowchart showing a paper humidification method by the paper humidifier 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 is separated from the plurality of pairs of water supply rollers 30 that are pressed against the pair of humidifying rollers 10. Is determined (S2). At this time, the control unit 50 determines what is to be pressed and what is to be separated based on, for example, the data described with reference to FIG.

  Next, the control unit 50 controls the plurality of pairs of water supply rollers 30 by pressing and separating based on the determination content of step S2 (S3). Thereafter, the process shown in FIG. 7 ends. Note that the process shown in FIG. 7 is repeatedly executed each time the information on the sheet S input from the control unit 6 is changed, for example.

  As described above, according to the sheet humidifying apparatus and the image forming system 1 according to the first embodiment, the amount of moisture applied from the plurality of pairs of water supply rollers 30 to the pair of humidifying rollers 10 is controlled. The amount of moisture applied to the pair of humidifying rollers 10 can be changed, and it is not necessary to reduce the linear speed when the paper S is humidified, and the humidifying amount for the paper S can be adjusted. Accordingly, it is possible to adjust the humidification amount for the paper S without reducing the productivity.

  Further, the amount of moisture applied to the pair of humidifying rollers 10 is controlled by causing each of the plurality of pairs of water supply rollers 30 to be in pressure contact with or separated from the pair of humidifying rollers 10. For this reason, the application amount of moisture applied to the pair of humidification rollers 10 can be changed only by the pressure contact and separation control, and the humidification 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 moisture applied to the pair of humidifying rollers 10 can be made different for each pair of water supply rollers. It can contribute to the adjustment of the amount of humidification.

  Moreover, since the plurality of pairs of water supply rollers 30 are solid type rollers, it is possible to improve roller durability. In particular, according to the technique described in Japanese Patent Application Laid-Open No. 2006-118863, the amount of moisture applied to the pair of humidification rollers is controlled by controlling the nip pressure between the pair of water supply rollers and the pair of humidification rollers. However, with this configuration, a porous roller is used as the water supply roller and the durability of the porous roller is low. However, in the above embodiment, since the amount of moisture applied is controlled by pressure contact and separation control, there is no restriction that a porous roller must be used, and durability can be improved by using a solid type roller. .

  Next, a second embodiment of the present invention will be described. The sheet humidifier according to the second embodiment is the same as that of the first embodiment, but the configuration and processing contents are partially different. Hereinafter, differences from the second embodiment will be described.

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

  In the second embodiment, the 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 humidifying rollers 10.

  In addition, the plurality of pairs of draining rollers 40 are configured to be capable of being pressed and separated from each of the water supply rollers 30, and are configured to remove moisture from the water supply roller 30 at the time of pressure contact.

  Furthermore, in 2nd Embodiment, the control part 50 selects the water supply roller 30 from which a water | moisture content is removed by several pairs of draining rollers 40 among each of several pairs of water supply rollers 30, and drains water with respect to the selected water supply roller 30. The roller 40 is pressed. Thereby, the control part 50 controls the application quantity of the water | moisture content to a pair of humidification roller 10 by removing a water | moisture content from the selected water supply roller 30. FIG.

  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. Subsequently, the control part 50 selects the water supply roller 30 which removes a water | moisture content 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 water supply roller 30 that is not selected.

  Thus, the control unit 50 controls the amount of moisture applied from each of the plurality of pairs of water supply rollers 30 to the pair of humidifying rollers 10.

  Thus, 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 reducing the productivity, as in the first embodiment. Further, the plurality of pairs of water supply rollers 30 having different surface roughness for each pair can contribute to finer adjustment of the humidification amount. Further, durability can be improved by using a solid type roller.

  Furthermore, according to 2nd Embodiment, in order to control the application | coating amount of the water | moisture content to a pair of humidification roller 10 by removing water | moisture content from each selected water supply roller 30 among each of several pairs of water supply rollers 30, draining The amount of moisture applied to the pair of humidifying rollers 10 can be changed only by pressure contact / separation control of the roller 40, and the amount of humidification can be adjusted by relatively simple control.

  The sheet humidifying device and the image forming system according to the present invention have been described above based on the embodiments. However, the present invention is not limited to this, and modifications may be made without departing from the spirit of the present invention. The techniques described in the embodiments, known techniques, and the like may be combined if possible.

  For example, in the above-described embodiment, the control unit 50 controls the amount of moisture 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 differs greatly between the front and back sides of the paper S, the humidification amount for the paper S can be controlled on the one side and less on the other side, and the humidification amount can be adjusted more finely. .

  In the second embodiment, when the plurality of pairs of draining rollers 40 and the plurality of pairs of water supply rollers 30 are separated from each other, the gap amount between them may be finely adjusted. This is because the water removal amount of each of the plurality of pairs of water supply rollers 30 can be adjusted, and the humidification amount can be further finely adjusted for the paper S.

  Further, in the above embodiment, the sheet humidifier is built in the post-processing apparatus B connected to the subsequent stage of the image forming apparatus A, but is not limited thereto, and is not connected to the image forming apparatus A and is a sheet after image formation. The present invention may be applied to an offline finisher that performs post-processing on S alone. In this case, the offline finisher may be provided with means for acquiring information on the paper S.

1: Image forming system 2: Image reading device 3: Image forming unit 3 a: Image transfer unit 3 b: Fixing unit 4: Paper feed tray 5: Reverse path 6: Control unit 10: A pair of humidifying rollers 20: A plurality of pairs of water ships 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 (multiple pairs) of draining rollers 50: A control unit (control means)
A: Image forming apparatus B: Post-processing apparatus C: Paper humidification part N: Nip part R: Transport path S: Paper Tr: Paper discharge tray

Claims (7)

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;
Control means for controlling the amount of moisture applied from each of the plurality of pairs of water supply rollers to the pair of humidification rollers;
A paper humidifying device comprising: The said control means controls the application quantity of the water | moisture content to the said pair of humidification roller by making each of the said several pairs of water supply roller press-contact or space apart with respect to the said pair of humidification roller. The paper humidifier according to 1. Further comprising water removal means capable of individually removing water adhering 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 means selects a water supply roller from which water is removed by the water removal means from among each of the plurality of pairs of water supply rollers, and removes water from the selected water supply roller, thereby supplying the pair of humidification rollers to the pair of humidification rollers. The paper humidifier according to claim 1, wherein the amount of moisture applied is controlled. The paper humidification device according to any one of claims 1 to 3, wherein the plurality of pairs of water supply rollers have different surface roughnesses for each pair. The paper humidifier according to any one of claims 1 to 4, wherein the control unit varies a water application amount between one and the other of the pair of humidifying rollers. The sheet humidification device according to any one of claims 1 to 5, wherein the plurality of pairs of water supply rollers are solid type rollers. A paper humidifier according to any one of claims 1 to 6,
An image forming apparatus that forms an image on a sheet and supplies the sheet to the sheet humidifier;
An image forming system comprising:

Images