WO2014069307A1 - シート処理装置及び画像形成システム - Google Patents
シート処理装置及び画像形成システム Download PDFInfo
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- WO2014069307A1 WO2014069307A1 PCT/JP2013/078723 JP2013078723W WO2014069307A1 WO 2014069307 A1 WO2014069307 A1 WO 2014069307A1 JP 2013078723 W JP2013078723 W JP 2013078723W WO 2014069307 A1 WO2014069307 A1 WO 2014069307A1
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- Prior art keywords
- sheet
- roller
- nip
- water
- processing apparatus
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
- B65H5/068—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between one or more rollers or balls and stationary pressing, supporting or guiding elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H27/00—Special constructions, e.g. surface features, of feed or guide rollers for webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/12—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers
- B65H29/125—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers between two sets of rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H37/00—Article or web delivery apparatus incorporating devices for performing specified auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
- G03G15/6573—Feeding path after the fixing point and up to the discharge tray or the finisher, e.g. special treatment of copy material to compensate for effects from the fixing
- G03G15/6576—Decurling of sheet material
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/09—Function indicators indicating that several of an entity are present
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2403/00—Power transmission; Driving means
- B65H2403/70—Clutches; Couplings
- B65H2403/72—Clutches, brakes, e.g. one-way clutch +F204
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
- B65H2404/143—Roller pairs driving roller and idler roller arrangement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/20—Means using fluid made only for liquid medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/20—Location in space
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
- B65H2515/30—Forces; Stresses
- B65H2515/32—Torque e.g. braking torque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
Definitions
- the present invention relates to a sheet processing apparatus for processing a sheet, and an image forming system such as a copying machine, a printer, or a facsimile equipped with the sheet processing apparatus.
- a latent image formed on a photosensitive drum as an image carrier is developed into a visible image, and this visible image (toner image) is used as a sheet using electrostatic force. Transcribe. Then, the toner image on the sheet is fixed by heat and pressure to record the image on the sheet.
- a pressure roller having elasticity is brought into pressure contact with a fixing roller having a heat source such as a heater inside and maintained at a predetermined temperature to form a fixing nip portion, and this fixing nip
- a heat roller fixing method is adopted in which a toner image is fixed to a sheet by a printing unit.
- the heating time can be extended from the viewpoint of improving the color developability of the toner image and the image quality.
- a fixing device capable of increasing the speed.
- JP-A-5-150679 a so-called belt nip type fixing device is known in which an endless fixing belt stretched around a plurality of rolls is brought into pressure contact with a heating roll.
- Paper is made up of short fibers intertwined, and water is contained inside or between fibers. Furthermore, since the fibers and water are in an equilibrium state in the state in which hydrogen bonds are generated, the smoothness is maintained.
- the pressure causes the fibers to shift, and when heat is applied in this state and the moisture evaporates, further hydrogen bonds are generated in the fibers to deform.
- this paper absorbs moisture from the environment, and the hydrogen bonds between the fibers are separated again to try to return to the original state.
- moisture does not enter between some fibers of the paper, thereby maintaining the deformation of the paper.
- the pattern of deformation is the above-described curling and waving, and the curling is generated by the difference in expansion and contraction of the paper, and the waving is generated by the difference in expansion and contraction at the central portion and the end of the paper.
- the first cause of the occurrence of the waving at the end of the sheet is in the process of the sheet passing through the nip portion of the fixing device.
- a fixing device provided with a wide nip such as a belt fixing method
- the end portion from the central portion in the width direction orthogonal to the sheet conveying direction Set the side conveyance speed high.
- the sheet end extends in the transport direction more than the center after passing through the nip, and corrugation occurs at the end of the sheet.
- the second cause of the occurrence of the waving at the end of the sheet is after the sheet passes through the nip of the fixing device.
- moisture in / out rapidly occurs. If heat is applied to the sheet in the fixing step and the moisture inside the sheet evaporates and then moisture is absorbed rapidly from the sheet edge, the sheet edge also extends more in the transport direction than near the center, and rippling occurs at the sheet edge .
- an object of the present invention is to improve the corrugation caused by the widthwise end of the sheet extending more in the transport direction than near the center.
- a tension applying device for applying tension in the transport direction to the sheet is provided in the area of the central portion in the width direction orthogonal to the transport direction of the sheet by transporting.
- the configuration of a typical image forming system according to the present invention includes a transfer unit for transferring a toner image onto a sheet, a fixing unit for heating the transferred toner image to fix it on the sheet, and processing the sheet. And a sheet processing apparatus having the above-described configuration.
- the central portion in the width direction of the sheet is stretched in the transport direction, and the length in the transport direction of the central portion in the width direction of the sheet is the sheet Can be made equal to the length in the transport direction of the widthwise end of the As a result, the sheet center length and the sheet end length can be made uniform, and the sheet end undulation can be improved.
- FIG. 1 is a cross-sectional view showing the electrophotographic printer of the first embodiment.
- FIG. 2 is a block diagram showing the control of the printer and sheet rippling correction apparatus of the first embodiment.
- FIG. 3 is a cross-sectional view showing the humidifying device of the first embodiment.
- FIG. 4 is a cross-sectional view showing the tension conveyance device and the curl correction device of the first embodiment.
- FIG. 5 is a perspective view showing the pulling and conveying apparatus of the first embodiment.
- FIG. 6 is a top view showing the pulling and conveying apparatus of the first embodiment.
- FIG. 7 is a cross-sectional view showing the curl correction device of the first embodiment.
- FIG. 8 is an external view showing the shape of the sheet.
- FIGS. 1 is a cross-sectional view showing the electrophotographic printer of the first embodiment.
- FIG. 2 is a block diagram showing the control of the printer and sheet rippling correction apparatus of the first embodiment.
- FIG. 3 is a cross-sectional view showing
- FIG. 10 is a cross-sectional view showing the electrophotographic printer of the first embodiment.
- FIG. 11 is a cross-sectional view showing the pulling and conveying apparatus of the second embodiment.
- FIG. 12 is a cross-sectional view showing the electrophotographic printer of the second and third embodiments.
- FIG. 13 is a perspective view showing the pulling and conveying apparatus of the second embodiment.
- FIG. 14 is a top view showing the pulling and conveying apparatus of the second embodiment.
- FIG. 15 is a flowchart showing control of the pulling and conveying apparatus of the second embodiment.
- FIG. 16 is a block diagram showing control of the pulling and conveying apparatus of the second embodiment.
- FIG. 17 (a) and 17 (b) are cross-sectional views showing control of the pulling and conveying apparatus of the second embodiment.
- 18 (a), (b) and (c) are tables showing the state of the sheet by experiment.
- FIG. 19 is a perspective view showing the pulling and conveying apparatus of the second embodiment.
- FIG. 20 is a perspective view showing the pulling and conveying apparatus of the third embodiment.
- FIG. 21 is a flowchart showing control of the pulling and conveying apparatus of the third embodiment.
- FIG. 22 is a block diagram showing control of the pulling and conveying apparatus of the third embodiment.
- 23 (a) and 23 (b) are cross-sectional views showing control of the pulling and conveying apparatus of the third embodiment.
- FIG. 24 is a cross-sectional view of the electrophotographic printer of the fourth embodiment.
- FIG. 25 is a top view showing the humidifying device of the fourth embodiment.
- FIG. 26 is a perspective view of the humidifying device of the fourth embodiment.
- FIG. 27 is a perspective view showing the periphery of the humidifying device and the water storage tank of the fourth embodiment.
- FIG. 28 is a block diagram showing the control of the printer and sheet rippling correction apparatus of the fourth embodiment.
- FIG. 29 is a cross-sectional view of the electrophotographic printer of the fourth embodiment.
- FIG. 30 is a block diagram showing control of the sheet corrugating correction device of the fifth embodiment.
- FIG. 31 is a cross-sectional view showing the sheet corrugating correction device of the fifth embodiment.
- FIG. 32 is a cross-sectional view showing a humidifying device of a fifth embodiment.
- FIG. 33 is a main part perspective view showing a drive configuration of the humidifying device of the fifth embodiment.
- FIG. 34 is a perspective view showing the periphery of a water storage tank of the humidifying device of the fifth embodiment.
- FIG. 35 is a cross-sectional view showing the water application and tension conveyance device of the sixth embodiment.
- FIG. 36 is a cross-sectional view showing a water application apparatus of the sixth embodiment.
- Fig.37 (a) is a top view which shows the water
- FIG.37 (b) is a front view explaining the water
- FIG. 38 (a) is a graph showing the relationship between circulation flow rate and pressure in the water application device of Example 6, and FIG.
- FIG. 38 (b) is a graph showing the relationship between circulation flow rate and application amount in the water application device of Example 6. .
- FIG. 39 is a graph showing changes in the moisture content of the sheet by experiments.
- FIG. 40 is an explanatory view showing the front view and the water content distribution in the water application apparatus of the sixth embodiment.
- FIG. 41 is a cross-sectional view showing a configuration of a coating roller in the water coating device of Example 6.
- FIG. 42 is a cross-sectional view and a block diagram showing a water application apparatus of the seventh embodiment.
- FIG. 43 is a cross-sectional view and a block diagram showing a water application apparatus of the seventh embodiment.
- FIG. 44 is a cross sectional view showing the electrophotographic printer of the eighth embodiment.
- FIG. 45 is a block diagram showing control of the printer and sheet rippling correction apparatus of the eighth embodiment.
- FIG. 46 is a cross-sectional view showing the tension conveyance device of Example 8 and the curl correction device.
- FIG. 47 is a cross sectional view showing the curling correction device of the eighth embodiment.
- FIG. 48 is a perspective view showing the vicinity of a fan of the curling correction device of the eighth embodiment.
- FIG. 49 is a rear view showing the vicinity of a fan of the curling correction device of the eighth embodiment.
- FIGS. 50 (a), (b) and (c) are tables showing the state of the sheet by experiment.
- Example 1 An image forming apparatus provided with a sheet processing apparatus according to the present embodiment will be described with reference to FIGS. In the following description, the image forming apparatus will be described first, and then the sheet processing apparatus will be described. In this embodiment, an image forming system in which the sheet processing apparatus is connected to the outside of the image forming apparatus will be described. However, the configuration of the image forming system in which the sheet processing apparatus is integrally incorporated in the image forming apparatus is described. The present invention is effective.
- FIG. 1 is a cross-sectional view schematically showing a color electrophotographic printer 500 which is an example of an image forming apparatus, and a sheet rippling correction apparatus 900 including a tension applying device which is an example of a sheet processing apparatus and a water addition apparatus.
- FIG. 2 is a cross-sectional view of the sheet in the sheet conveying direction.
- a color electrophotographic printer is simply referred to as a "printer”.
- the sheet is one on which a toner image is formed.
- Specific examples of the sheet include plain paper, resin-like sheet substitutes for plain paper, thick paper, and overhead projectors.
- the printer 500 illustrated in FIG. 1 includes image forming units 510 of respective colors of Y (yellow), M (magenta), C (cyan), and Bk (black).
- the image forming unit 510 of each color forms a toner image of each color on a sheet.
- An endless intermediate transfer belt 531 as an intermediate transfer member is disposed to face the image forming portions. That is, it is an image forming apparatus adopting a tandem system in which processes up to visualization are processed in parallel for each color.
- the arrangement order of the image forming units of Y, M, C, and K colors is not limited to the arrangement order shown in FIG. Further, the present invention is not limited to the full-color intermediate transfer type image forming apparatus shown in FIG.
- the image forming unit 510 of each color is provided with the following process means.
- An electrophotographic photosensitive member (hereinafter referred to as a photosensitive drum) 511 as an image bearing member carrying an electrostatic latent image on the surface corresponding to each of Y, M, C and K colors, a charging roller 512 and a laser scanner 513;
- the developing device 514 is provided.
- the photosensitive drum 511 is charged in advance by the charging roller 512. Thereafter, the photosensitive drum 511 is exposed by the laser scanner 513 to form a latent image.
- the latent image is developed by the developer 514 and visualized as a toner image.
- Each toner image formed and carried on the surface of the photosensitive drum 511 is sequentially overlapped and primarily transferred onto the intermediate transfer belt 531 by the primary transfer roller 515 at the primary transfer portion of the photosensitive drum 511 and the primary transfer roller 515. Ru.
- the sheets P are fed one by one from the feeding cassette 520 and fed to the registration roller pair 523.
- the registration roller pair 523 temporarily receives the sheet P, and corrects the skew when the sheet is skewed.
- the registration roller pair 523 synchronizes with the toner image on the intermediate transfer belt 531 and sends the sheet P to the secondary transfer portion between the intermediate transfer belt 531 and the secondary transfer roller 535.
- the color toner images on the intermediate transfer belt 531 are collectively secondarily transferred onto the sheet P by, for example, a secondary transfer roller 535 which is a transfer portion.
- the sheet on which the image (toner image) is formed by the image forming unit as described above is conveyed to the fixing device 100.
- the fixing device (fixing unit) 100 fixes the toner image on the sheet by sandwiching the sheet at the fixing nip portion and applying heat and pressure to the unfixed toner image.
- the sheet having passed through the fixing device 100 is sent to a sheet rippling correction apparatus 900 as a sheet processing apparatus for processing the sheet by a discharge roller pair 540, and the rippling of the sheet is corrected by the sheet rippling correction apparatus 900. Discharged into
- the fixing device 100 includes a fixing roller 110 which is a heating rotating body, and a pressure roller 111 which is a pressure rotating body.
- the fixing roller 110 applies heat generated by an internal halogen heater (not shown) to the toner on the sheet P and conveys the sheet P together with the pressure roller 111.
- the fixing roller 110 incorporates a halogen heater in a metal core formed of an aluminum cylindrical tube having an outer diameter of 56 mm and an inner diameter of 50 mm, for example.
- an elastic layer made of silicone rubber having a thickness of 2 mm and a hardness (Asuka C) of 45 ° is further coated, and a surface layer of the elastic layer is coated with a PFA or PTFE heat-resistant release layer.
- the pressure roller 111 conveys the sheet P together with the fixing roller 110.
- the pressure roller 111 also has a metallic core made of, for example, an aluminum cylindrical tube having an outer diameter of 56 mm and an inner diameter of 50 mm.
- a metallic core made of, for example, an aluminum cylindrical tube having an outer diameter of 56 mm and an inner diameter of 50 mm.
- an elastic layer made of silicone rubber having a thickness of 2 mm and a hardness (Asuka C) of 45 ° is further coated, and a surface layer of the elastic layer is coated with a PFA or PTFE heat-resistant release layer.
- a fixing nip portion is formed by the fixing roller 110 and the pressure roller 111.
- the sheet P under the conditions that the preset temperature of the surface layer of the fixing roller 110 is 180 ° C., the preset temperature of the surface layer of the pressure roller 111 is 100 ° C., the ambient temperature is 23 ° C., and the ambient humidity is 50%. Is transported at a transport speed of about 300 to 500 mm / sec.
- the sheet P heated and pressurized is such that the end portion in the width direction orthogonal to the sheet conveyance direction is larger in fibers in the conveyance direction than the center side, and as a result, the end portion is waved (Hereafter, it is called a wave) occurs.
- the sheet type information of the sheet P in the feeding cassette 520 is input by the user using the operation panel 570, and is sent to a control unit 500C having a CPU and a memory in the printer 500 shown in FIG.
- the image density information of the toner image on the sheet P on which the image is formed by the image forming unit 510 is sent to a control unit 500C having a CPU and a memory in the printer 500 shown in FIG.
- the temperature and humidity in the image forming apparatus 500 are detected by an environment sensor 500D installed at the upper portion of the feeding cassette 520 in the image forming apparatus 500, and the temperature and humidity information is the control unit 500C having the CPU and memory. Sent to
- the sheet P on which the toner image is fixed by the fixing device 100 is sent to the sheet rippling correction device 900 by the discharge roller pair 540.
- the sheet P is conveyed along the conveyance guide 902 by the entrance roller pair 901 of the sheet corrugating correction device 900, and after the conveyance direction is turned vertically downward (direction of arrow B in FIG. 1) by the conveyance guide 902, It is sent to the sheet humidifier 400 as a moisture addition means.
- the sheet P is humidified by the humidification roller pair 401 and 402.
- the sheets P discharged from the sheet humidifying device 400 are successively sent to the sheet pulling and conveying devices 101, 201, and 301 as tension applying devices. After being humidified to a predetermined moisture content or more by the sheet humidifying device 400, the sheet stretching and conveying devices 101, 201, and 301 are sequentially passed, and the central portion in the width direction orthogonal to the sheet conveying direction is pulled in the conveying direction. Reduce the difference in length between the end of the sheet and the center sheet in the transport direction.
- the sheet P having the improved undulation at the widthwise end of the sheet is then sent to the curl correction device 600 to correct the curl.
- the sheet P in which the curl is corrected is conveyed by the conveyance roller pair 904 while the conveyance direction is changed vertically upward (in the direction of the arrow C in FIG. 1) by the conveyance guides 903 and 905. After that, the sheet P is conveyed by the conveyance roller pair 906, 908 while being guided by the conveyance guides 907, 909, discharged by the discharge roller pair 910 to the outside of the sheet waving correction device 900, and stacked on the discharge tray 565.
- reference numeral 400A denotes a water storage tank in which a humidifying liquid L for humidifying the sheet P is stored.
- the humidifying liquid L stored in the water storage tank 400A is optionally supplied with water toward the water supply pipes 411 and 412 provided in the sheet humidifying apparatus 400 by the pump 400B through the water supply pipe 400C as needed.
- the humidifying liquid (also referred to as a coating liquid) L is mainly composed of water.
- FIG. 2 is a block diagram showing the control relationship between the printer 500 forming the image forming system and the sheet rippling correction apparatus 900 as a whole.
- the control unit 500C of the printer 500 and the control unit 901C of the sheet ruffle correction apparatus 900 are a computer system having a CPU, a memory, an arithmetic unit, an I / O port, a communication interface, a drive circuit, and the like.
- control by each of the control units 500C and 901C described above is performed by each CPU executing a predetermined program stored in the memory.
- a control unit 901C of the sheet corrugating correction device 900 controls the operations of the sheet humidifying device 400, the sheet stretching and conveying devices 101, 201, and 301, and the curl correction device 600 that constitute the device. Further, the above-described control units 500C and 901C can be connected via the communication unit COM to exchange information.
- control unit (control means) 901C of the sheet rippling correction apparatus 900 is controlled by the control section (control means) 500c of the printer 500 to control the operation of the sheet rippling correction apparatus 900.
- the sheet waving correction device may not have a control unit, and the control unit of the printer may control the operation of the sheet waving correction device.
- FIG. 3 is a cross-sectional view showing the entire sheet humidifier 400. As shown in FIG. 3
- the sheet P sent in the direction of arrow B in FIG. 3 same as the direction of arrow B in FIG. 1 is guided by the entry guides 414 and 414 and sent to the nip portion of the first pair of humidifying rollers 401 and 402. It is humidified by being transferred to its surface.
- the sheet P which has passed through the nip portion of the humidification rollers 401 and 402 is sent to the first sheet tension conveyance device 101 through the discharge guide 413.
- the humidifying rollers 401 and 402 are elastic rollers each having a solid rubber layer mainly composed of NBR, silicon or the like formed on an axial core surface made of a metal rigid body such as stainless steel.
- the water supply rollers 405, 406, 407, and 408 are water supply members for sequentially supplying the humidifying liquid L in the water supply pots 411 and 412 to the humidification roller pair 401 and 402.
- the water supply roller 405, 406, 407, 408 is a material having a hydrophilic surface capable of holding water on an axial core surface made of a metal rigid body such as stainless steel, for example, a solid rubber layer mainly composed of NBR etc. Is an elastic roller formed.
- the solid rubber layer may use a metal, a resin subjected to a hydrophilization treatment, or the like.
- the water supply rollers 407 and 408 supply the humidification liquid L to the water supply rollers 405 and 406 by pumping the humidification liquid L in the water supply reservoirs 411 and 412 and then abut on the water supply rollers 405 and 406.
- the water supply rollers 405 and 406 supply the humidification liquid L to the humidification rollers 401 and 402 by contacting the humidification rollers 401 and 402.
- the first regulation rollers 409 and 410 are first regulation members for regulating the amount of water supplied to the water supply rollers 407 and 408.
- the first regulation rollers 409 and 410 are rollers in which a core surface made of a metal rigid body such as stainless steel is plated with nickel, chromium or the like.
- the first regulation roller 409 abuts on the water supply roller 407, and the first regulation roller 410 abuts on the water supply roller 408, and the amount of the humidifying liquid held on the surface of each solid rubber layer is suppressed to an appropriate amount. Regulate the amount of water. That is, the first regulation rollers 409 and 410 press-contact and deform the solid rubber layers of the water supply rollers 407 and 408, respectively, to squeeze the humidifying liquid held on the surface.
- the second regulation rollers 403 and 404 are second regulation members for regulating the amount of water supplied to the humidification rollers 401 and 402.
- the second regulation rollers 403 and 404 are rollers in which a core surface made of a metal rigid body such as stainless steel is plated with nickel, chromium or the like.
- the second regulating roller 403 is in contact with the humidifying roller 401, and the second regulating roller 404 is in contact with the humidifying roller 402, thereby suppressing the amount of the humidifying liquid held on the surface of each solid rubber layer to an appropriate amount. Regulate the amount of water. That is, the second regulation rollers 403 and 404 press-contact and deform the solid rubber layers of the humidification rollers 401 and 402, respectively, to squeeze the humidifying liquid held on the surface.
- the sheet P is humidified to an optimal moisture content, and the tension effect is promoted by the sheet tension conveyance devices 101, 201, and 301 described above.
- the drive gear G1 of FIG. 33 is fixed to the shaft end side of the humidification roller 402, and rotational drive is transmitted from the drive motor M52 of FIG.
- the other rollers are driven to rotate by drive transmission from the surface of the humidifying roller 402.
- the amount of moisture given to the sheet is separated by the pair of humidification rollers that humidifies the sheet P, and hydrogen bonds between the fibers of the sheet P are separated, and the sheet tension conveyance device 101, 201, 301 moves to the central portion in the width direction of the sheet P. It can be increased to the moisture content necessary to promote the expansion and contraction due to the tension load.
- each sheet pulling and conveying apparatus 101, 201, 301
- the respective configurations of the first sheet tension conveyance device 101, the second sheet tension conveyance device 201, and the third sheet tension conveyance device 301 are common, and the central portion in the width direction of the sheet P is conveyed in the conveyance direction.
- a plurality of roller pairs are provided to apply tension to the sheet for stretching. Therefore, about the composition explanation of the sheet tension conveyance device mentioned below, it explains on behalf of the first sheet tension conveyance device 101, and the detailed explanation of the second sheet tension conveyance device 201 and the third sheet tension conveyance device 301 is omitted. .
- FIG. 4 is a front cross-sectional view for explaining the sheet pulling and conveying apparatus 101, 201, 301 of the present embodiment and a curl correcting apparatus 600 described later.
- 5 is a perspective view for explaining the sheet pulling and conveying apparatus 101, 201, 301 of the present embodiment
- FIG. 6 is a left sectional view for explaining the sheet pulling and conveying apparatus 101, 201, 301 of the present embodiment.
- the first roller pair is a first upper roller 104, which is a rotatable first roller, and the first upper roller 104 so as to be in pressure contact with the first upper roller 104 to form a nip portion N11 to nip and convey the sheet P. It consists of a first lower roller 105 which is a pressure roller.
- the second roller pair is provided downstream of the first roller pair in the transport direction.
- the second roller pair is a second upper roller 106, which is a rotatable second roller, and the second upper roller 106 in pressure contact with the second upper roller 106 to form a nip portion N21 to nip and convey the sheet P.
- the second lower roller 107 is a pressure roller.
- the sheet pulling and conveying apparatus 101 includes a first upper roller 104 and a first lower roller 105 that constitute a first roller pair, and a second upper roller 106 and a second lower roller 107 that constitute a second roller pair. Hold and transport.
- the sheet pulling and conveying apparatus 101 further applies tension to the sheet P for stretching the central portion in the width direction of the sheet P in the conveying direction while conveying the sheet P.
- the first upper roller 104, the first lower roller 105, the second upper roller 106, and the second lower roller 107 have elastic rubbers 104b, 105b, 106b, 107b such as silicon, NBR, EPDM, etc. .
- the elastic rubbers 104b, 105b, 106b and 107b are respectively formed on the surface layer of the roller shafts 104a, 105a, 106a and 107a using high rigidity materials such as stainless steel and steel.
- the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 are equal to the central portion in the sheet width direction so as to be equal to the sheet passing center (the center in the width direction). It is formed in a region of length L1.
- the sheet passing center is a central position in the width direction which is a reference when conveying the sheet.
- an upper conveyance guide 114 and a lower conveyance guide 115 which are guide members for guiding the sheet are provided, and the distance between the nip portions is It is 25 mm.
- the first upper roller 104 and the second upper roller 106 are supported at both ends of the roller shafts 104 a and 106 a by an upper plate 119 shown in FIG. 6 via bearings (not shown).
- the first lower roller 105 is supported at both ends of the roller shaft 105 a by a pressure plate 112 shown in FIG. 6 via a bearing (not shown). Further, the first lower roller 105 is biased by a first pressure spring 109 shown in FIG. 5 between the pressure plate 112 and a bearing (not shown). As a result, the first lower roller 105 is pressed against the first upper roller 104 to form the first nip portion N11.
- the biasing force of the first pressing spring 109 is set so that the total roller pressing force is about 98 N (10 kgf).
- the second lower roller 107 is supported by the pressure plate 112 via bearings (not shown) at both ends of the roller shaft 107a.
- the second lower roller 107 is biased between a pressure plate 112 and a bearing (not shown) by a second pressure spring 108 shown in FIG.
- the biasing force of the second pressing spring 108 is set so that the pressing force is about 98 N (10 kgf).
- the first upper roller 104 is rotated by receiving rotational drive via the drive transmission gears 123, 124, 125, 126 by the motor gear MG1 of the drive motor M1 which is a drive source (drive means). Be done.
- the second upper roller 106 is rotated by receiving rotational driving via the drive transmission gears 123, 127, 128, 129.
- the first lower roller 105 and the second lower roller 107 which are pressed by the first upper roller 104 and the second upper roller 106, are rotated by the rotation of the first upper roller 104 and the second upper roller 106, respectively. .
- the drive transmission gear 124 is provided with a one-way clutch (not shown).
- the one-way clutch is locked when the first upper roller 104 rotates in the conveyance direction of the sheet P by the drive of the drive motor M1, and the drive of the drive motor M1 is transmitted to the first upper roller 104.
- the second upper roller 106 rotates at substantially the same transport speed as the inlet roller pair 503.
- the first upper roller 104 has a conveying speed smaller than that of the second upper roller 106.
- the transport speed (peripheral speed) of the first upper roller 104 is set to be about 2% smaller than the transport speed (peripheral speed) of the second upper roller 106.
- a drive gear 104G2 is fixed to the other end of the first upper roller 104, and is connected to the torque limiter 131 via the drive transmission gear 130.
- the torque limiter 131 only needs to apply a driving load to the first upper roller 104, and may be an electromagnetic brake or a brake pad.
- the tension applied to the sheet P is about 68 N (7 kgf) so that the tension applied to the sheet P is about 68 N (7 kgf).
- the setting value is set.
- the setting value of the torque limiter 131 is set within a range in which the sheet P itself is not damaged while a sufficient tension is applied to the sheet P.
- the sheet P is guided by the entrance guides 102 and 121 in the sheet tension conveyance device 101, and is nipped by the first nip portion N ⁇ b> 11 of the sheet tension conveyance device 101.
- the sheet P is conveyed at the conveyance speed set in the first nip portion N11 until the sheet P is nipped by the first nip portion N11 to the second nip portion N21.
- the number of rotations of the drive motor M1 is set so that the transport speed is 294 mm / s at the first nip portion N11.
- the sheet P is conveyed by the second nip portion N21 at a conveyance speed faster than the first nip portion N11.
- the transport speed is set to 300 mm / s at the second nip portion N21.
- the first roller pair 104, 105 of the sheet pulling and conveying apparatus 101 rotates following the sheet P conveyed by the second roller pair 106, 107. Further, since the torque limiter 131 is connected to the first upper roller 104 via the drive gear 104G2 and the drive transmission gear 130, a torque load is generated to rotate the first upper roller 104. As a result, the sheet P is conveyed to the sheet P while tension is generated between the first roller pair 104 and the second roller pair 106 and 107.
- the reason for providing a plurality of sheet tension conveyance devices is to obtain a sufficient tensile effect of the sheet P.
- the tensile effect of the sheet P can also be increased by increasing the tension between the first nip N11 and the second nip N21.
- the tension is excessively increased and the sheet P is suddenly stressed, the damage to the sheet P may be increased, and the quality of the product may be degraded.
- slippage occurs in the second nip portion N21, and variations in the tensile effect of the sheet P and variations in the conveyance speed occur.
- the sheet P can be provided with a tensile effect without any adverse effect.
- the tension setting value of the torque limiters 131, 231, 331 is about 68 N (7 kgf), and the plurality of sheet tension conveyance devices 101, 201, 301 are provided.
- the tensile effect of the sheet can be sufficiently obtained without deteriorating the quality of the product, and the sheet is corrugated. It can be improved.
- the sheet P discharged from the sheet pulling and conveying apparatus 101, 201, 301 may cause curling due to the image formed on the sheet P and the sheet humidifying apparatus 400.
- the sheet P is humidified by the sheet humidifier 400 in a state in which the difference in toner image density is large between the front and back surfaces of the sheet, the side where the toner image density of the sheet P is low extends. Therefore, curling occurs due to the difference in the elongation of the front and back surfaces of the sheet. Specifically, the toner image is curled to the high side.
- the curl correcting device 600 is provided on the downstream side of the sheet pulling and conveying apparatus 101, 201, 301.
- the curl correction device 600 includes a first curl correction unit 601 for correcting the curl of the sheet in a convex state on one side and a second correction unit for correcting the curl in the sheet in a convex state on the other side. And a curl correction unit 602.
- the first curl correction unit 601 includes a sponge roller 603, a rigid roller 604, and a backup roller 609.
- the sponge roller 603 is composed of an elastic portion made of a sponge material and a roller shaft of a rigid body whose center is made of metal.
- the rigid roller 604 is a metal roller, and is disposed on the opposite side of the sponge roller 603. Both ends of the sponge roller 603 are held by holding sheet metal 605 which can be rotated by a rotation center 606, respectively, and these configurations are integrated into an assembly.
- an eccentric cam 608 rotatable on a rotation center shaft 607 is in sliding contact with the holding plate 605. Then, as the eccentric cam 608 rotates, the assembly rotates about the rotation center 606 and presses the sponge roller 603 against the rigid roller 604. Then, the amount by which the sponge roller 603 bites into the rigid roller 604 can be changed according to the rotation angle of the eccentric cam 608, whereby the correction amount of the curl of the sheet P can be changed.
- the holding sheet metal 605 is biased toward the eccentric cam 608 by receiving a spring force by a tension spring 612, and the holding sheet metal 605 is always in contact with the outer peripheral surface of the eccentric cam 608.
- the backup roller 609 brings the outer peripheral surface into contact with the outer peripheral surface of the rigid roller 604, and prevents the rigid roller 604 from being bent when pressed against the sponge roller 603. Further, the backup roller 609 is rotatable on the inner peripheral surface via a bearing 610 and a support shaft 611.
- a pulley 613 integrated with a rotation flag is fixed to an end of a rotation center shaft 607 of the eccentric cam 608, and can be rotated by a stepping motor M61 via a timing belt 615. Further, the rotational position of the eccentric cam 608 is detected by the photo interrupter 614, and the position is held at a predetermined angle by the rotational angle of the stepping motor M61.
- the rigid roller 604 rotates via a gear 616 connected to the motor M62 and a gear (not shown).
- the sponge roller 603 and the backup roller 609 rotate as the rigid roller 604 rotates.
- the sponge roller 603 is brought into pressure contact with the rigid roller 604, and a curved nip portion (hereinafter referred to as a curved nip portion) of the sponge roller 603 formed by the rigid roller 604 biting into the sponge roller 603 is formed. Then, in FIG. 7, the curling of the sheet is corrected by passing through the curved nip portion the sheet P in which the curling in the convex state occurs on the right side.
- the amount of biting of the rigid roller 604 into the sponge roller 603 changes in accordance with the rotational position of the eccentric cam 608, so that the degree of bending of the bending nip portion also changes to correct the curling of the sheet.
- the amount of correction can be changed. That is, it is possible to adjust the amount of correction of curling in accordance with the size of curling occurring in the sheet.
- the positional relationship between the sponge roller and the rotation center 617 of the holding plate is different from that of the first curl correction unit 601, so that the relation in the rotation direction of the holding plate is Although it is opposite to the first curl correction unit 601, in particular, the curl correction configuration is the same as the first curl correction unit 601.
- the second curl correction unit 602 correction is performed on a sheet in which the direction of the curl is opposite to that of the first curl correction unit 601 (curling in a convex state on the left side in FIG. 7). Further, in the adjustment of the amount of correction of curl, the rotation angle of the stepping motor M63 is controlled, and the amount of biting of the rigid roller into the sponge roller is changed according to the rotation position of the eccentric cam. To be done.
- the rigid roller is rotated via a gear 616 connected to the motor M62 and a gear (not shown), and the sponge roller and the backup roller are rotated following rotation of the rigid roller. .
- the sheet P passed through the sheet tension conveying devices 101, 201, 301 and the curl correcting device 600 is continuously It mounts on the surface plate 650 for measurement shown in FIG.
- the end length of the sheet P in the sheet conveyance direction is L edge [mm]
- the center length is L center [mm].
- a curved shape Pwave produced at the upper side or lower side of the sheet P shown in FIG. 8, that is, the end in the width direction orthogonal to the transport direction is referred to as end wave, and among them, the gap with the measurement surface plate 650
- the maximum amount X was taken as the amount of corrugation, and the maximum one Y max among the distances from the measurement surface plate 650 at the four corner ends of the sheet P was evaluated as the maximum amount of curl.
- FIG. 9 shows the results of the effect confirmation experiment of the tension applying device and the curl correction device in the present embodiment performed by the present inventors.
- 70% of the toner image is placed on the front side of the sheet P, and the sheet moisture amount immediately after passing through the sheet humidifier 400 is 7% or more in the state where the toner image is not placed on the back side.
- the measurement of the moisture content of the sheet in the present embodiment was performed by the present inventors using the sheet P immediately after the sheet P passes through the sheet waving correction device 900 and is discharged onto the discharge tray 565.
- a microwave type paper moisture meter was used.
- FIG. 9A shows a state in which the sheet waving correction device 900 is not passed immediately after passing through the fixing device 100
- FIG. 9B shows a state in which the curl correction effect of the curl correction device 600 is turned off (first curl correction portion 601, a state in which the curved nip portion of the second curl correction unit 602 is not formed), a state in which the curl correction effect of the curl in a convex state upwards of the curl correction device 600 is ON in FIG.
- the elongation amount of the central length L center of the sheet P is 0 mm, whereas the elongation amount of the end length L edge is 0.6 mm, The end is longer than the center by 0.6 mm.
- the maximum waving amount X max was as large as 3.3 mm.
- the maximum curling amount Y max was 5.0 mm.
- the central length L center of the sheet P is extended by 0.6 mm, and a sufficient tensile effect is obtained.
- the maximum waving amount X max was reduced to 1.0 mm.
- the maximum curling amount Y max was improved to 1.0 mm.
- the curl correction device 600 As described above, by arranging the curl correction device 600 on the downstream side of the sheet tension conveyance devices 101, 201, and 301 in the conveyance direction, it has been confirmed that the curling is also improved while correcting the sheet waving.
- the direction of curling (curling in a convex state on the left side and curling in a convex state on the right side shown in FIG. 7) and the curl correction amount are the surface of the sheet on which the toner is transferred, the toner density, and the sheet humidification amount. Since it is known in advance by experiment etc. depending on the size etc., it is possible to select a curl correction unit and a curl correction amount to be used for each sheet according to the direction of the curl.
- the sheet information sent to the CPU in the image forming apparatus and the control unit having the memory the image density information of the toner image on the sheet P on which the image is formed, the temperature and humidity information by the environment sensor 500D, and the humidification amount information.
- the curl can be adjusted for each sheet.
- the curl correction device 600 exemplifies a configuration in which the curl correction is performed by the curved nip portion due to the biting of the sponge roller 603 and the rigid roller 604, but the present invention is not limited to this configuration. Absent. For example, as shown in FIG. 10, a configuration is provided in which a curl correction device 600 using an endless belt 621 stretched around a plurality of rollers and a curved nip portion due to biting of a rigid roller 622 is provided for each different curl. I don't care.
- the width of the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 is 100 mm, but the present invention is not limited to this.
- the outer diameters of the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 are at least partially changed in the rotational axis direction, and the central portion in the rotational axis direction is larger than the end portion in the rotational axis direction. May be
- the roller may have a tapered shape in which only the central portion has a straight shape and the outer diameter decreases from the central portion toward the end.
- the outer diameter of the roller may be a crown which is a parabola.
- Example 2 An image forming apparatus provided with a tension applying device according to the present embodiment will be described with reference to FIGS. 11 to 17 and 8. FIG. In addition, some components are omitted for detailed explanation. In the following description, the image forming apparatus will be described first, then the fixing device will be described, and then the tension applying device will be described. In the present embodiment, an image forming system in which the tension applying device is integrally incorporated into the image forming apparatus will be described, but the configuration of the image forming system in which the tension applying device is connected to the outside of the image forming apparatus The invention is effective.
- FIG. 12 is a cross-sectional view schematically showing a color electrophotographic printer 500 which is an example of the image forming apparatus, and is a cross-sectional view along the sheet conveyance direction.
- a color electrophotographic printer is simply referred to as a "printer”.
- the sheet is one on which a toner image is formed.
- Specific examples of the sheet include plain paper, resin-like sheet substitutes for plain paper, thick paper, and overhead projectors.
- a printer 500 illustrated in FIG. 12 includes image forming units 510 of respective colors of Y (yellow), M (magenta), C (cyan), and Bk (black).
- the image forming unit 510 of each color forms a toner image of each color on a sheet.
- an endless intermediate transfer belt 531 as an intermediate transfer member is disposed so as to longitudinally penetrate these image forming portions. That is, it is an image forming apparatus adopting a tandem system in which processes up to visualization are processed in parallel for each color.
- the arrangement order of the image forming portions of Y, M, C, and K colors is not limited to the arrangement order shown in FIG. Further, the present invention is not limited to the full-color intermediate transfer type image forming apparatus shown in FIG.
- the image forming unit 510 of each color is provided with the following process means.
- An electrophotographic photosensitive member (hereinafter referred to as a photosensitive drum) 511 as an image bearing member carrying an electrostatic latent image on the surface corresponding to each of Y, M, C and K colors, a charging roller 512 and a laser scanner 513;
- the developing device 514 is provided.
- the photosensitive drum 511 is charged in advance by the charging roller 512. Thereafter, the photosensitive drum 511 is exposed by the laser scanner 513 to form a latent image.
- the latent image is developed by the developer 514 and visualized as a toner image.
- the respective toner images formed and carried on the surface of the photosensitive drum 511 are sequentially superimposed on the intermediate transfer belt 531 by the primary transfer roller 515 at the primary transfer portion of the photosensitive drum 511 and the primary transfer roller 515 to perform primary transfer. Be done.
- the sheets P are fed one by one from the feeding cassette 520 and fed to the registration roller pair 523.
- the registration roller pair 523 temporarily receives the sheet P, and corrects the skew when the sheet is skewed.
- the registration roller pair 523 synchronizes with the toner image on the intermediate transfer belt 531 and sends the sheet P to the secondary transfer portion between the intermediate transfer belt 531 and the secondary transfer roller 535.
- the color toner images on the intermediate transfer belt 531 are collectively secondarily transferred onto the sheet P by, for example, a secondary transfer roller 535 which is a transfer portion.
- the sheet on which the image (toner image) is formed by the image forming unit as described above is conveyed to the fixing device 100.
- the fixing device (fixing unit) 100 fixes the toner image on the sheet by sandwiching the sheet at the fixing nip portion and applying heat and pressure to the unfixed toner image.
- the sheet having passed through the fixing device 100 is discharged to the discharge tray 565 by the discharge roller pair 540 through the tension applying device 101 which applies tension to the center of the sheet in the width direction described later.
- the fixing device 100 includes a fixing roller 110 which is a heating rotating body, and a pressure roller 111 which is a pressure rotating body.
- the fixing roller 110 applies heat generated by an internal halogen heater (not shown) to the toner T on the sheet P, and conveys the sheet P together with the pressure roller 111.
- the fixing roller 110 incorporates a halogen heater in a metal core formed of an aluminum cylindrical tube having an outer diameter of 56 mm and an inner diameter of 50 mm, for example.
- an elastic layer made of silicone rubber having a thickness of 2 mm and a hardness (Asuka C) of 45 ° is further coated, and a surface layer of the elastic layer is coated with a PFA or PTFE heat-resistant release layer.
- the pressure roller 111 conveys the sheet P together with the fixing roller 110.
- the pressure roller 111 also has a metallic core made of, for example, an aluminum cylindrical tube having an outer diameter of 56 mm and an inner diameter of 50 mm.
- a metallic core made of, for example, an aluminum cylindrical tube having an outer diameter of 56 mm and an inner diameter of 50 mm.
- an elastic layer made of silicone rubber having a thickness of 2 mm and a hardness (Asuka C) of 45 ° is further coated, and a surface layer of the elastic layer is coated with a PFA or PTFE heat-resistant release layer.
- a fixing nip portion N shown in FIG. 11 is formed by the fixing roller 110 and the pressure roller 111.
- the sheet P under the conditions that the preset temperature of the surface layer of the fixing roller 110 is 180 ° C., the preset temperature of the surface layer of the pressure roller 111 is 100 ° C., the ambient temperature is 23 ° C., and the ambient humidity is 50%. Is transported at a transport speed of about 300 to 500 mm / sec. Then, the sheet P heated and pressed in the fixing nip portion N has a larger end in the width direction orthogonal to the sheet conveyance direction than in the center side, and the fibers extend in the conveyance direction as a result. Partial waving (hereinafter referred to as waving) occurs.
- the sheet P on which the toner image is fixed by being heated and pressed in the fixing nip N formed by the fixing roller 110 and the pressure roller 111 is the upper discharge guide 501 and the lower discharge as shown in FIG.
- the guide 502 is guided.
- the sheet P guided between the upper discharge guide 501 and the lower discharge guide 502 passes through the inlet roller pair 503, and then the sheet P of the inlet upper guide 102 and the inlet lower guide 121 in the tension applying device 101. You will be guided in between.
- the tension applying device 101 for applying tension to a sheet will be described.
- the tension applying device 101 is a sheet for tensioning the sheet P in the width direction to extend the central portion in the width direction of the sheet P guided between the upper discharge guide 501 and the lower discharge guide 502. It has a plurality of roller pairs to apply to.
- a first roller pair is a first upper roller 104, which is a rotatable first roller, and the first upper roller 104, which is in pressure contact with the first upper roller 104 to form a nip portion N1 to nip and convey the sheet P. It consists of a first lower roller 105 which is a pressure roller.
- the second roller pair is provided downstream of the first roller pair in the transport direction.
- the second roller pair is a second upper roller 106, which is a rotatable second roller, and the second upper roller 106 in pressure contact with the second upper roller 106 to form a nip portion N2 to nip and convey the sheet P.
- the second lower roller 107 is a pressure roller.
- the tension applying device 101 nips the sheet P by the first upper roller 104 and the first lower roller 105 constituting the first roller pair, and the second upper roller 106 and the second lower roller 107 constituting the second roller pair. And transport.
- the tension applying device 101 further applies tension to the sheet P for stretching the central portion in the width direction of the sheet P in the transport direction while transporting the sheet P. Then, the sheet P is guided between the outlet upper guide 117 and the outlet lower guide 118 and discharged out of the tension applying device 101.
- the first upper roller 104, the first lower roller 105, the second upper roller 106, and the second lower roller 107 have elastic rubbers 104b, 105b, 106b, 107b such as silicone, NBR, EPDM, etc. .
- the elastic rubbers 104b, 105b, 106b and 107b are respectively formed on the surface layer of the roller shafts 104a, 105a, 106a and 107a using high rigidity materials such as stainless steel and steel.
- the outer diameters ⁇ of the elastic rubbers 104b, 105b, 106b and 107b are all 20 mm. Further, as shown in FIG.
- the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 are equal to the center of the sheet passing, and the area of the central length L1 in the sheet width direction It is formed in.
- the sheet passing center is a central position in the width direction which is a reference when conveying the sheet.
- an upper conveyance guide 114 and a lower conveyance guide 115 which are guide members for guiding a sheet are provided between the nip portions of the first roller pair and the second roller pair, and the distance between the nip portions is 25 mm. .
- the first upper roller 104 and the second upper roller 106 are supported by the upper plate 119 via bearings (not shown) at both ends of the roller shafts 104 a and 106 a.
- the first lower roller 105 is supported at both ends of the roller shaft 105 a by a first pressure plate 113 via a bearing (not shown).
- the first pressure plate 113 is rotatably supported by the lower side plate 120 via a first rotation shaft (not shown), and the bottom surface thereof is biased by a first pressure spring 109.
- the first lower roller 105 is pressed against the first upper roller 104 to form the nip portion N1.
- the second lower roller 107 is supported at both ends of the roller shaft 107 a by a second pressure plate 112 via a bearing (not shown).
- the second pressure plate 112 is rotatably supported by the lower plate 120 via a second rotation shaft (not shown), and the bottom surface thereof is biased by a second pressure spring 108.
- the second lower roller 107 is pressed against the second upper roller 106, thereby forming the nip portion N2.
- the entrance lower guide 121 is provided with a reflected light type sheet sensor 103 for detecting the arrival of the sheet P as shown in FIG.
- the sheet sensor 103 as a sheet detection unit is disposed at a predetermined distance toward the upstream side from the nip portion N2 of the second roller pair.
- FIG. 14 is a top view for explaining the driving of the first upper roller 104 and the second upper roller 106.
- the CPU is a control means for controlling the operation of the electromagnetic clutch CL as a clutch means (drive control means) and the drive motor M as a drive means according to the signal of the sheet sensor 103.
- a drive gear 104 ⁇ / b> G ⁇ b> 1 is held and fixed at one end of the first upper roller 104.
- the first upper roller 104 is rotationally driven by the drive gear 104G1 via the drive transmission gears 123, 124 and 125, and the clutch gear CLG by the motor gear MG of the drive motor M which is a drive source (drive means). It is rotated.
- the first lower roller 105 pressurized by the first upper roller 104 rotates following the rotation of the first upper roller 104.
- a drive gear 106G is held and fixed.
- the second upper roller 106 is rotated by the motor gear MG of the drive motor M, which is a drive source, when the drive gear 106G receives rotational drive via the drive transmission gears 126, 127, 128, and 129.
- the second lower roller 107 pressurized by the second upper roller 106 rotates following the rotation of the second upper roller 106.
- the clutch gear CLG is fixed to the electromagnetic clutch CL.
- the driving force between the clutch gear CLG and the drive transmission gear 124 is transmitted via the clutch shaft 132, and the first upper roller 104 rotates.
- the electromagnetic clutch CL is not energized, the drive power between the clutch gear CLG and the drive transmission gear 124 is not transmitted, the drive power of the drive motor M is transmitted to the drive gear 104G, and the first upper roller 104 does not rotate. .
- a drive gear 104G2 is fixed at the other end of the first upper roller 104.
- the drive gear 104G2 is connected to a load means 131 such as a torque limiter or an electromagnetic brake via a drive transmission gear (drive transmission member) 130.
- FIG. 15 is a flowchart relating to drive control of the present embodiment
- FIG. 16 is a block diagram relating to drive control of the present embodiment
- FIG. 17 is a front cross-sectional view of the tension application device 101 for explaining the drive control of this embodiment.
- FIG. 17 (a) is a front sectional view at 0 to X msec after the sheet sensor is turned on
- FIG. 17 (b) is a front sectional view at X msec after the sheet sensor is turned on.
- the energization of the electromagnetic clutch CL is turned off after X msec (S5-5) ).
- the value of X is a time from immediately after the sheet sensor 103 is turned on to immediately after the leading end of the sheet P is pinched by the nip portion of the second roller pair. It is determined by the distance to the nip of the pair of rollers. That is, the control means determines that the sheet is nipped by the nip portion of the second roller pair from the predetermined distance from the sheet sensor 103 to the nip portion of the second roller pair and the conveyance speed of the sheet P. In the present embodiment, since the conveyance speed of the sheet P is 300 mm / s and the distance from the sheet sensor 103 to the nip portion of the second roller pair is 45 mm, X is set to 160 msec.
- the drive to the first upper roller 104 is released. That is, as shown in FIG. 17A, at time 0 to X msec after the sheet sensor is turned on, the electromagnetic clutch CL is in the ON state, and therefore, the first upper roller 104 conveys the sheet P with the drive transmitted. Thereafter, as shown in FIG. 17B, at the point of time X msec after the sheet sensor is turned on, the leading end of the sheet P is immediately after reaching the nip portion of the second roller pair, and the sheet P is at the second upper roller 106. It is transported by driving.
- the electromagnetic clutch CL is turned off, and the drive is not transmitted to the first upper roller 104, so the first roller pair is driven to rotate. Further, since the first upper roller 104 is connected to the load means 131 via the drive gear 104G2 and the drive transmission gear 130, a torque load is generated to rotate the first upper roller 104. As a result, in FIG. 17B, the sheet P is conveyed while a predetermined tension force (tension) is generated between the first roller pair and the second roller pair.
- the load torque of the load means 131 is set such that the tension force applied to the sheet P is about 59 N (about 6 kgf).
- the nip portion between the first roller pair and the second roller pair has a width (length L1) of 100 mm at the sheet passing center of the sheet.
- a tension force (tension) of about 59 N (about 6 kgf) is applied to the sheet P from the front end to the rear end only at the central portion in the width direction.
- the drive motor M is turned off (S5-6), and the process is finished (S5-7). The above flow is repeated for the second and subsequent sheets.
- the sheet P which has passed the tension applying device 101 is shown in FIG. Place it on the surface plate 650 for measurement.
- the end length of the sheet P in the sheet conveyance direction is L edge [mm]
- the center length is L center [mm].
- a curved shape Pwave produced at the upper side or lower side of the sheet P shown in FIG. 8, that is, the end in the width direction orthogonal to the transport direction is referred to as end wave, and among them, the gap with the measurement surface plate 650 The largest one, X max, was evaluated as the amount of corrugation.
- FIG. 18A the end length L edge [mm], the center length L center [mm] and the maximum corrugation amount X max [mm] of the sheet P immediately after passing the fixing device at 300 mm / s are described. doing.
- FIG. 18B the end length L edge [mm] of the sheet P and the center length L center [mm] immediately after passing the fixing device and further passing the tension applying device according to the present embodiment at 300 mm / s. ] And the maximum waving amount X max [mm] is described.
- the expansion amount of the central length L center of the sheet P is 0 mm, whereas the expansion amount of the end length L edge is 0.6 mm, The end is longer than the center by 0.6 mm.
- the sheet end extends more than the center after the nip portion is discharged.
- the amount of elongation of the central length L center of the sheet P is 0.4 mm.
- the elongation amount of the end length L edge is 0.6 mm, and the difference between the end and the center length is 0.2 mm. That is, the central portion of the sheet P is pulled by the effect of the tension applying device (tension application) in the present embodiment, and thus the sheet extends in the transport direction, and as a result, the difference between the end and the center decreases.
- the difference between the sheet length at the end and the center becomes smaller, and the maximum corrugation amount is 3.3 mm as shown in FIG. 18 (a) as compared with 1 shown in FIG. 18 (b). It improved to .7 mm, that is, about 1/2.
- A is the length in the conveyance direction of the central portion in the width direction of the sheet before passing through the tension applying device 101
- a ' is the length in the conveying direction of the central portion in the width direction of the sheet after passing through the tension applying device It is.
- B is the length in the conveying direction of the end in the width direction of the sheet before passing through the tension applying device 101
- B ' is the length in the conveying direction of the end of the sheet in the width direction after passing through the tension applying device 101 It is.
- A is the central length after discharging shown in FIG. 18 (a)
- B is after the discharge shown in FIG. 18 (a).
- the end length A ' is the central length after discharge shown in FIG. 18 (b)
- B' is the end length after discharge. Therefore, the relationship of the above length is A ⁇ A ', B-A> B'-A'.
- the width of the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 is 100 mm in this embodiment, the present invention is not limited to this.
- the outer diameters of the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 are at least partially changed in the rotational axis direction, and the central portion in the rotational axis direction is larger than the end portion in the rotational axis direction. May be
- the length in the width direction of the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 is made longer than the length in the width direction of the largest sheet,
- D2> D1 and D3 may be set.
- D2 25 mm
- D1 and D3 24.7 mm.
- the width D2 has a straight shape only at the central portion 100 mm, and the outer diameter decreases with a taper toward the end.
- the conveyance speed of the sheet P is higher at the central portion than at the end portion, and the nip pressure at the central portion is higher, so that the sheet central portion is tensioned.
- the sheet central portion by pulling the sheet central portion, it is possible to reduce the difference in sheet length between the end portion and the central portion and to improve the waving.
- a tapered shape is shown in FIG. 19, a crown shape whose outer diameter shape is a parabolic shape may be used.
- Example 3 This will be described using FIG. 20 to FIG. In the present embodiment, the same configuration is adopted except that only the drive mechanism of the second embodiment is changed, so the description will be omitted.
- FIG. 20 is a perspective view of the tension applying device 101 for explaining the present embodiment.
- FIG. 21 is a flowchart for explaining the control of this embodiment
- FIG. 22 is a block diagram for explaining the control of this embodiment.
- FIG. 23 is a front cross-sectional view of the tension applying device 101 for explaining the control and configuration of this embodiment.
- FIG. 23 (a) is a front cross-sectional view at 0 to X msec after sheet sensor ON
- FIG. 23 (b) is a front cross-sectional view at X msec after sheet sensor ON.
- the drive gear is not provided at one end of the first upper roller 104 shown in FIG. Therefore, the first upper roller 104 is not coupled to the motor gear of the drive motor M by the coupling gear.
- a drive gear (not shown) is held and fixed at one end of the second upper roller 106 shown in FIG.
- the second upper roller 106 is rotated by the drive gear receiving rotational driving via a drive transmission gear (not shown) by a motor gear (not shown) of the drive motor M which is a drive source (drive means).
- the pressure release mechanism of the first lower roller 105 which is a feature of this embodiment, will be described below.
- the pressure release mechanism of the first lower roller 105 is pressure release means for releasing the pressure applied to the first upper roller by the first lower roller 105, and is configured as described below.
- a pressure release cam 134 is disposed on the front side and the back side of the first pressure plate 113 pressing the first lower roller 105.
- the pressure release cam 134 is fixed to the pressure release shaft 135.
- the pressure release shaft 135 is supported by the lower plates 120 on both sides via bearings 137.
- a drive gear 136 is fixed to one end of the pressure release shaft 135, and is connected to a pressure release motor gear M2G of the pressure release motor M32 fixed to the lower side plate 120.
- a sensor flag 140 is fixed to the other end of the pressure release shaft 135, and the pressure release sensor 139 can detect the rotational position of the pressure release cam 134.
- the energization of the pressure release motor M32 is turned on after X msec and the motor shaft After the Y ° rotation, it is turned off (S12-6).
- the value of X is a time from immediately after the sheet sensor 103 is turned on to immediately after the leading end of the sheet P is pinched by the nip portion of the second roller pair. It is determined by the distance to the nip of the pair of rollers.
- X is set to 160 msec.
- the value of Y is the rotation angle of the motor shaft required for the pressure release cam 134 to rotate 180 °, and is determined by the gear ratio of the pressure release motor gear M2G and the drive gear 136.
- the sheet P is transported between the upper transport guide 114 and the lower transport guide 115 by the inlet roller pair 503 shown in FIG. Thereafter, as shown in FIG. 23B, at the point of time X msec after the sheet sensor is turned on, the leading end of the sheet P is immediately after reaching the nip portion of the second roller pair, and the sheet P is at the second upper roller 106. It is transported by driving. At the same time, as described above, the first roller pair in which the first lower roller 105 is pressurized to the first upper roller 104 is not driven to be transmitted to the first upper roller 104, and thus becomes a driven rotation.
- the first upper roller 104 is connected to the load means 131 via the drive gear 104G2 and the drive transmission gear 130 which are drive transmission members, a predetermined load torque is required to rotate the first upper roller 104. Occur.
- the load torque of the load means 131 is set such that the tension force applied to the sheet P is about 59 N (about 6 kgf).
- the nip portion between the first roller pair and the second roller pair is 100 mm in width (length L1) at the center of sheet passing.
- a tension force (tension) of about 59 N (about 6 kgf) is applied to the sheet P from the front end to the rear end only at the central portion in the width direction.
- the drive motor M is turned off (S12-7), and the process is finished (S12-8). The above flow is repeated for the second and subsequent sheets.
- Example 4 An image forming apparatus provided with the sheet processing apparatus according to the present embodiment will be described with reference to FIGS. 24 to 29.
- FIG. In the following description, the image forming apparatus will be described first, and then the sheet processing apparatus will be described.
- an image forming system in which the sheet processing apparatus is connected to the outside of the image forming apparatus will be described.
- the present invention is also applicable to an image forming system in which the sheet processing apparatus is integrally incorporated in the image forming apparatus. The invention is effective.
- FIG. 24 is a cross-sectional view schematically showing a color electrophotographic printer 500 as an example of an image forming apparatus, and a sheet rippling correction apparatus 900 including a tension applying apparatus 101 as an example of a sheet processing apparatus and a water addition apparatus 450.
- FIG. 7 is a cross-sectional view of the sheet along the sheet conveyance direction.
- a color electrophotographic printer is simply referred to as a "printer".
- the sheet is one on which a toner image is formed.
- Specific examples of the sheet include plain paper, resin-like sheet substitutes for plain paper, thick paper, and overhead projectors.
- the printer 500 shown in FIG. 24 has a configuration similar to that of the printer 500 described with reference to FIG. 1 in the first embodiment described above. Therefore, members having the same functions are given the same reference numerals, and the description thereof is used. It shall be, and detailed explanation is omitted here.
- the sheet P on which the toner image is fixed by the fixing device 100 is sent to the sheet rippling correction device 900 by the discharge roller pair 540.
- the sheet P is conveyed by the entrance roller pair 901 of the sheet corrugating correction device 900, and after being turned in the substantially vertical direction downward (direction of arrow B in FIG. 24) in the conveyance direction, is sent to the sheet humidifying device 450 as a moisture addition device.
- the sheet humidifying device 450 is disposed in the conveyance path from the conveying roller pair 911 to the conveying roller pair 912, and the sheet P is humidified by the sheet humidifying device 450 in the process of passing the side surface of the sheet humidifying device 450.
- the sheet P which has passed through the sheet humidifying device 450 is sent by the conveying roller pair 912 to the sheet pulling and conveying device 101 as a tension applying device. After humidifying to a predetermined moisture amount or more by the sheet humidifying device 450, the sheet tensioning and conveying device 101 is allowed to pass, and the central portion in the width direction orthogonal to the sheet conveying direction is pulled in the conveying direction. To reduce the difference in length in the sheet conveyance direction.
- the sheet P in which the waving at the end portion in the width direction of the sheet is improved, is conveyed by the conveyance roller pair 904 while turning the conveyance direction substantially upward in the vertical direction (arrow C direction in FIG. 24). Thereafter, the sheet P is conveyed by the conveyance roller pair 906 and 908, discharged by the discharge roller pair 910 out of the sheet corrugating correction device 900, and stacked on the discharge tray 565.
- FIG. 27 shows the structure around the conveyance roller pair 911, the conveyance roller pair 912, the sheet humidifier 450, the water storage tank 400A, and the water supply pump 400B.
- reference numeral 400A denotes a water storage tank in which a humidifying liquid L for humidifying the sheet P is stored.
- the humidifying liquid L stored in the water storage tank 400A is directed to the sheet humidifying device 450 by the water supply pump 400B, passes through the inside of the water supply pipe 400C, and is supplied with water as needed in the direction of arrow D shown in FIG.
- the humidifying liquid L contains water as a main component, and may be formulated with a surfactant in consideration of the humidifying efficiency and permeability of the sheet P.
- FIG. 28 is a block diagram showing the control relationship between the printer 500 forming the image forming system and the sheet rippling correction apparatus 900 as a whole.
- a control unit 500C of the image forming apparatus 500 and a control unit 901C of the sheet rippling correction apparatus 900 are a computer system having a CPU, a memory, an arithmetic unit, an I / O port, a communication interface, a drive circuit and the like.
- control by each of the control units 500C and 901C described above is performed by each CPU executing a predetermined program stored in the memory.
- the control unit 901C of the sheet waving correction device 900 controls the operation of the sheet tension conveyance device 101 and the sheet humidifying device 450 that constitute the device. Further, the above-described control units 500C and 901C can be connected via the communication unit COM to exchange information.
- FIG. 25 is a top view showing the sheet humidifying device 450
- FIG. 26 is a perspective view showing the sheet humidifying device.
- a spray humidifier that sprays a liquid in a mist form is illustrated.
- a plurality of jet outlets 452 for spraying the humidifying liquid L in a mist form are opened on the surface of the sheet humidifying device 450 on the side facing the sheet P.
- the plurality of jet nozzles 452 are provided side by side in the width direction of the sheet.
- the sheet humidifying device 450 sprays the humidifying liquid L in a fan shape in a fan shape in the arrow direction indicated by 460 in FIG. 25 on the sheet P according to a command from the control unit 901C (see FIG. 28).
- the fan-shaped spray width (spray area) on the surface of the sheet P is W shown in FIG. 25, but the spray widths (spray areas) from adjacent jets 452 to the sheet slightly overlap each other.
- the width (size), interval, and spray angle of 452 are set. Therefore, the sheet P is sprayed and humidified without gaps in the width direction on the surface.
- a shutter 451 shown in FIG. 26 opens and closes each jet 452 of the sheet humidifier 450.
- the shutter 451 reciprocates in the direction of arrow E in FIG. 26 in response to a command from the control unit 901C (see FIG. 28) to open and close each jet 452, thereby switching between spraying and non-spraying of the humidifying liquid L. Inject only the part.
- any device can be used.
- a rotor dampening device manufactured by WEKO can be suitably used.
- the sheet humidifying device 450 in the present embodiment is not limited to the above-described rotor dampening device.
- Various sprayable devices can be employed.
- a device may be used in which a large number of shower nozzles are arranged in the width direction and only a necessary part is jetted.
- FIGS. 13 to 17 The configuration of the sheet pulling and conveying apparatus 101 and the drive control thereof are the same as those described with reference to FIGS. 13 to 17 in the second embodiment described above. Therefore, FIGS. 13 to 17 and the description thereof are used, and the detailed description is omitted here.
- the sheet P passed through the sheet pulling and conveying device 101 is shown in FIG. Put on the top.
- the end length of the sheet P in the sheet conveyance direction is L edge [mm]
- the center length is L center [mm].
- a curved shape Pwave produced at the upper side or lower side of the sheet P shown in FIG. 8, that is, the end in the width direction orthogonal to the transport direction is referred to as end wave, and among them, the gap with the measurement surface plate 650 The largest one, X max, was evaluated as the amount of corrugation.
- FIG. 18A the end length L edge [mm], the center length L center [mm] and the maximum corrugation amount X max [mm] of the sheet P immediately after passing the fixing device at 300 mm / s are described. doing.
- FIG. 18C after passing through the fixing device, the end length L edge [mm] of the sheet P immediately after passing the water addition device and tension application device according to the present embodiment at 300 mm / s in this embodiment, the central length L center [mm] and maximum wave size X max [mm] are described.
- the expansion amount of the central length L center of the sheet P is 0 mm, whereas the expansion amount of the end length L edge is 0.6 mm, The end is longer than the center by 0.6 mm.
- the sheet end extends more than the center after the nip portion is discharged.
- the sheet when passing through the fixing device at 300 mm / s and then passing the sheet rippling correction device 900 according to the present embodiment at 300 mm / s, the sheet is left for 1 day after passing through the tension applying device. Later, the elongation amount of the center length L center of the sheet is 0.6 mm. On the other hand, the elongation amount of the end length L edge is 0.6 mm, and the difference between the end and the center length is 0 mm. That is, moisture was applied by the sheet humidifying device 450, and the central portion of the sheet P was pulled by the sheet pulling and conveying device 101. As a result, the amounts of elongation at the end and the central portion became substantially equal.
- the maximum waving amount was 3.3 mm as shown in FIG. 18 (a), but 1.0 mm as shown in FIG. 18 (c). That is, it improved to about 1/3.
- the water content of the sheet exhibiting the above effect is 8% or more in a certain predetermined paper type.
- the difference between the end and center sheet length is reduced by pulling the center of the sheet in the process of passing the sheet tension conveyance device after applying moisture and humidifying to a predetermined amount of moisture or more, I was able to improve the waving.
- the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 have a straight shape with a width (length L in FIG. 13) of 100 mm. It may be a crown shape which is a parabolic shape. That is, the outer diameters of the elastic rubbers 105b and 107b of the first lower roller 105 and the second lower roller 107 at least partially change in the rotational axis direction, and the central portion in the rotational axis direction is more than the end portion in the rotational axis direction. You may enlarge it.
- the height from the contact surface Z of the apparatus in FIG. 24 to the conveyance path from the discharge roller pair 540 of the printer 500 to the inlet roller pair 901 of the sheet ruffle correction device 900 is T1.
- the height from the roller pair 910 to the discharge port is T2.
- FIG. 29 shows an example in which a sorter apparatus 1000 having a function of sorting sheets to a plurality of sorting trays 1001 is connected to the further downstream side of the sheet waving correction apparatus 900.
- the height T1 from the device ground plane Z to the conveyance path from the discharge roller pair 540 of the printer 500 to the inlet roller pair 901 of the sheet rippling correction device 900 and the discharge roller of the sheet rippling correction device 900 By setting the height T2 from the pair 910 to the discharge port to the same dimension, the connection and connection functions of the respective devices can be made versatile. That is, it is also possible to connect the sorter apparatus 1000 directly without placing the sheet corrugating correction apparatus 900 on the downstream side of the color electrophotographic printer 500. As a result, the functionality of the entire system including the color electrophotographic printer 500 and the sheet waving correction device 900 can be secured.
- the conveyance path (arrow B direction) of the sheet P in the conveyance path of the sheet P from the substantially vertical direction is provided in the conveyance path of the sheet P
- the overall functionality of the system can be achieved by disposing the sheet humidifying device 450, which is a moisture applying unit that changes the amount of water, and the sheet tension conveyance device 101, which is a tension applying unit to the sheet P on the downstream side (downward) side.
- the sheet humidifying device 450 which is a moisture applying unit that changes the amount of water
- the sheet tension conveyance device 101 which is a tension applying unit to the sheet P on the downstream side (downward) side.
- Example 5 The sheet humidifying device 400 of the sheet waving correction device 900 of this embodiment will be described with reference to FIGS. 30 to 34.
- the configuration and the operation other than the sheet humidifying device 400 in the sheet waving correction device 900 of the present embodiment are the same as in the fourth embodiment described above, and therefore the description thereof is omitted. Further, as to the configuration of the sheet humidifying device 400 in the present embodiment, members having the same functions as those of the sheet humidifying device 400 in the first embodiment described above are given the same reference numerals.
- the sheet waving correction device 900 in the present embodiment is the one in which the sheet humidifying device 450 in the fourth embodiment is replaced with the sheet humidifying device 400, but the same is true for the purpose of humidifying the sheet P.
- the humidifying solution is sprayed to add moisture to the sheet, but in the present embodiment, the moisture is added to the sheet by the roller that holds the humidifying solution on the surface layer and rotates. Are illustrated.
- the sheet P sent in the direction of arrow B in FIG. 31 as in the direction of arrow B in FIG. 24 is guided by the entry guide 414 shown in FIG. 32 and sent to the nip portion of the pair of humidifying rollers 401 and 402. It is humidified by being transferred to the surface.
- the humidifying roller pair 401, 402 is an elastic roller in which a solid rubber layer mainly composed of NBR, silicon or the like is formed on an axial core surface made of a metal rigid body such as stainless steel.
- the water supply rollers 407 and 408 are water supply members for sequentially supplying the humidifying liquid L with water.
- the water supply rollers 407 and 408 are formed of a material having a hydrophilic surface capable of holding the humidifying liquid L on a shaft core surface made of a metal rigid body such as stainless steel, for example, a solid rubber layer mainly composed of NBR or the like. Elastic roller.
- the solid rubber layer may use a metal, a resin subjected to a hydrophilization treatment, or the like.
- a water storage tank 400A shown in FIG. 31 is connected to water supply pipes 411 and 412 provided in the sheet humidifier 400 as shown in FIG. 34 via a pump 400B.
- the humidifying liquid L accommodated in the water supply pipe 400C is directed by the pump 400B toward the water supply rod 411, 412 through a branch portion 400C1 provided in the water supply pipe 400C, respectively in the directions of arrows F1, F2 shown in FIGS. It is branched water supply at any time.
- the humidifying liquid L contains water as a main component.
- the branched pipes of the water supply pipe 400C are respectively connected to water supply holes 411a and 412a provided approximately directly below the water supply rollers 407 and 408 at the bottom of the water supply pipe 411 and 412, respectively.
- the humidifying liquid L supplied with water by the pump 400B and accumulated at the bottom of the water supply reservoir 411, 412 through the water supply holes 411a, 412a is humidified by the rotation of the water supply rollers 407, 408 in which the lower part is immersed. It is pumped up by the action of the viscosity and surface tension of the liquid L itself and the wettability of the rubber surface layer of the water supply rollers 407 and 408.
- the regulation rollers 403 and 404 are in contact with the humidification rollers 401 and 402, respectively, to suppress the amount of the humidifying liquid held on the surface of the humidification roller to an appropriate amount, and regulate the amount of water supplied to the sheet.
- the regulation rollers 403 and 404 are made of, for example, stainless steel or a material that is hard-chromed on the steel surface.
- a drive input gear G1 for drive input is fixed to one end of the humidification roller 402 as shown in FIG.
- the drive motor M52 is a drive source for rotationally driving the drive input gear G1, and the drive gear G2 is coaxially fixed.
- the drive of the drive motor M52 is transmitted to the drive input gear G1 by the engagement of the drive input gear G1 and the drive gear G2.
- the water supply roller 408 and the restriction roller 404 are pressurized by the humidifying roller 402, and the water supply roller 407 and the restriction roller 403 are pressurized by the pressure spring 420, which is a U-shaped tension coil spring shown in FIG. There is.
- the humidification roller 402 when the humidification roller 402 is rotationally driven by transmitting the drive of the drive motor M52 to the drive input gear G1, the humidification roller 401 other than the humidification roller 402, the water supply rollers 407 and 408, and the regulation roller 403, All of 404 are driven to rotate.
- the drive of the drive motor M52 is controlled by the control unit 901C.
- the other configuration is the same as the configuration shown in FIG. 28 in the fourth embodiment described above, and therefore, members having the same function are denoted by the same reference numerals, and the description will be omitted.
- the sheet P humidified by entering the nip portion of the humidifying roller pair 401, 402 and transferring the humidifying liquid L onto the surface thereof is guided by the discharge guide 413 and discharged from the sheet humidifying device 400, and then the embodiment The sheet is conveyed to the sheet pulling and conveying apparatus 101 in the same manner as in No.
- the degree to which the sheet is improved in the case where the amount of humidification of the sheet P by the sheet humidifier 400 in the present embodiment is about 7% as in the fourth embodiment is also equivalent to that in the fourth embodiment.
- the present invention is not limited to the configuration in which the humidifying liquid is sprayed to give moisture to the sheet as in the fourth embodiment described above, but the moisture is applied to the sheet using the humidifying roller pair that holds the humidifying liquid on the surface and rotates. The same effect as that of the fourth embodiment described above can be obtained.
- FIG. 35 is a cross-sectional view showing a water application device and a tension application device of a sixth embodiment.
- FIG. 36 is a cross-sectional view showing a water application apparatus of the sixth embodiment.
- Fig.37 (a) is a top view which shows the water
- FIG.37 (b) is a front view explaining the water
- FIG. 38 (a) is a graph showing the relationship between circulation flow rate and pressure in the water application device of Example 6, and FIG. 38 (b) is a graph showing the relationship between circulation flow rate and application amount in the water application device of Example 6. .
- FIG. 39 is a graph showing changes in the moisture content of the paper by experiments.
- a water application device 800 having water addition means for adding water to a sheet where curling or waving occurs is added. Therefore, the description of components other than the water application device is omitted.
- the water application device 800 is disposed downstream of the fixing device 100 and upstream of the tension applying device 101 in the sheet conveyance direction.
- the water application device 800 between the first roller pair and the second roller pair of the tension application device 101, it is possible to arrange the water application device 800 in front of the tension application device 101 and Is effective for the change of the sheet length by the tension applying device 101.
- an application method a configuration in which a method for supplying a liquid to a sheet (a chamber method) is adopted while a chamber holding a liquid is in contact with an application roller is illustrated.
- the water application apparatus is configured to supply the liquid while bringing the liquid holding member (chamber) holding the liquid into contact with the application roller, and has advantages such as drying of the liquid and prevention of liquid leakage. is there.
- the image forming apparatus it is possible to prevent the leakage and the like of the coating liquid due to the posture change during transportation.
- the water application device 800 applies a liquid (moisture) to a sheet as a water addition means, and a liquid holding space formed in contact with the application roller 801. And a liquid holding member 850 for holding the The moisture application device 800 applies the liquid supplied from the liquid holding member 850 to the surface of the application roller 801 to the sheet by rotating the application roller 801.
- the application roller 801 is rotationally driven by a drive unit (not shown).
- a backup roller 802 is disposed at a position facing the application roller 801.
- the back-up roller 802 is coated with ceramic particles at a thickness of about 1 mm on an iron core metal having an outer diameter of 14 mm.
- the backup roller 802 is pressed against the application roller 801 by a pressing unit (not shown), and is rotated by the rotation of the application roller 801 to nip and convey the sheet.
- the backup roller 802 is a mere round shaft, the coating liquid stagnates and accumulates in the nip portion N4 with the application roller 801. Therefore, the backup roller 802 is a special roller with fine irregularities on the surface so that a liquid film (coating liquid, liquid) can pass through the nip N4.
- the backup roller 802 is a ceramic coated roller in which ceramic particles are coated on a core metal to provide asperities. The size of the unevenness is adjusted by the size of the ceramic particles, and for example, when ceramic particles having an average diameter of 20 ⁇ m are coated, the surface roughness (size of the unevenness) Ra is about 15 ⁇ m.
- the liquid holding member 850 is pressed against the application roller 801 by a pressing unit (not shown), and the contact member 852 contacts the application roller 801. Then, a liquid holding space S elongated in the sheet width direction extending over the entire liquid application area of the application roller 801 is formed together with the space forming base 851.
- the coating liquid is supplied from the liquid flow path into the liquid holding space S via the liquid holding member 850.
- the liquid holding member 850 includes a space forming base 851 and an annular contact member 852 protruding from one surface of the space forming base 851.
- the contact member 852 is, as shown in FIG. 36, when the application roller 801 rotates in the arrow direction, as shown in FIG. 37 (a), the downstream contact portion 852a in the roller rotation direction and the upstream contact portion It is a symmetrical shape formed integrally with 852b.
- the annular contact member 852 is fixed to the space forming base 851. Both edge portions of the contact member 852 in the sheet width direction are formed in a circular arc shape so as not to cause the contact surface with the application roller 801 to be biased. Therefore, the liquid holding member 850 is in contact with the outer peripheral surface of the application roller 801 in a continuous state without any gap, with the seamless annular contact member 852.
- the liquid holding space S becomes a substantially closed space by the contact member 852, one surface of the space forming base 851, and the outer peripheral surface of the application roller 801, and the liquid is held in this space. Then, in the state where the rotation of the application roller 801 is stopped, the contact member 852 and the outer peripheral surface of the application roller 801 can maintain the liquid tight state, and the liquid can be reliably prevented from leaking to the outside.
- the liquid (application liquid) held in the liquid holding space S slides between the outer peripheral surface of the application roller 801 and the downstream side contact portion 852 a. It adheres in layers to the outer peripheral surface.
- the outer peripheral surface and the contact member 852 are in a liquid tight state when the application roller 801 is in a stopped state means that the liquid does not pass between the inside and the outside of the liquid holding space S.
- the contact state of the contact member 852 is not only in a state in which it is in direct contact with the outer peripheral surface of the application roller 801, but also on the outer peripheral surface of the application roller 801 via a liquid film formed by surface tension. Including the state of contact.
- the space forming base material 851 has holes passing through the space forming base material 851, respectively, in the region surrounded by the contact member 852.
- a liquid supply port 853 and a liquid recovery port 854 are provided. These are in communication with cylindrical connecting portions 855 and 856 provided on the back side of the space forming base 851.
- the connection parts 855 and 856 are connected to the liquid flow path, the liquid supply port 853 supplies the liquid (coating liquid) supplied from the liquid flow path to the liquid holding space S, and the liquid recovery port 854 is The liquid in the liquid holding space S is made to flow out to the liquid flow path.
- the liquid (coating liquid) is transferred from one end (supply port side) of FIG. 37 (a) and FIG. 37 (b) to the other end in the liquid holding space S. Flow to the department (collection port side).
- the liquid flow path controls the operation of a buffer tank for storing the coating liquid, a replaceable exchange tank for supplying the coating liquid to the buffer tank, a pump (liquid flow means) for forcibly flowing the coating liquid, And a control unit.
- a control unit controls the circulation speed and the coating speed of the coating liquid. That is, the circulation speed of the liquid generated in the liquid holding member 850 (the circulation flow rate) and the rotation speed of the coating roller 801 are controlled by the circulation by the supply and recovery of the coating liquid to the liquid holding member 850.
- the coating liquid (moisture) used in the present embodiment is a liquid for the purpose of preventing the sheet from being corrugated.
- the slidability at the contact portion of the liquid holding member with the application roller causes the liquid to contain a component to lower the surface tension. It will be good.
- glycerin and a surfactant are components that lower the surface tension of water.
- seat is not limited to water.
- the permeability to a sheet is further improved by using an aqueous solution containing a deliquescent substance that takes in water in the air as the aqueous solution (water) to be sprayed.
- the inclusion of the deliquescent substance makes it easy for the aqueous solution to enter between the fibers of the paper, and the effect of breaking the hydrogen bonds between the fibers is also enhanced, and the curling and waving of the paper can be reduced.
- an aqueous solution containing a surfactant having a hydrophilic group and a hydrophobic group it is possible to improve the permeability to the sheet and reduce the adhesion between the upper and lower sides when the sheet is loaded.
- FIG. 38 (a) shows the pressure relative to the circulation flow rate in the liquid holding space S.
- FIG. 38A shows the average pressure in the flow direction of the liquid holding space S when the water head difference between the buffer tank (not shown) and the liquid holding member 850 is 0 (zero).
- the pressure in the liquid holding space S decreases as the flow velocity increases.
- a pressure of 0.95 [atm] is used. Therefore, the inside of the liquid holding space S is under negative pressure.
- FIG. 38 (b) shows the application amount of the application roller with respect to the circulation flow rate in the liquid holding space S.
- the coating amount decreases as the circulation flow rate increases (the flow rate increases).
- the contact pressure of the contact member 852 against the application roller 801 increases.
- the contact area of the nip N5 between the downstream side contact part 852a and the application roller 801 increases, and the gap between the nip N5 decreases, so that the liquid is less likely to slip off the nip N5.
- the circulation flow rate is 80 [g / min]
- the coating amount is 0.15 [g / A4].
- the circulation flow rate (flow velocity) of the coating liquid is changed (increased or decreased)
- the contact state of the nip portion N5 between the contact member 852 and the coating row is changed, and the coating liquid is contained in the liquid holding member 850.
- the amount by which the ink passes through the gap of the nip portion N5, that is, the amount of application changes.
- the coating liquid adheres to the outer periphery of the coating roller 801 in a layer state. Then, the sheet P for which the fixing process has been completed by the fixing device 100 is introduced into the nip portion N4 between the application roller 801 and the backup roller 802, whereby approximately 100% of the application liquid on the application roller 801 is applied to the sheet P. Ru.
- the coating liquid L in the non-passing area of the sheet P and between sheets (interval between sheets) rotates while the coating liquid L remains on the coating roller 801, and the nip portion with the backup roller 802 Slip through N4. Furthermore, the pressure between the application roller 801 and the upstream contact portion 852 b is slipped against the pressing force of the upstream contact portion 852 b and returns to the inside of the liquid holding space S. Then, it is mixed with the coating liquid filled in the liquid holding space S.
- the liquid holding space S has a negative pressure as compared with the atmospheric pressure, when the coating liquid on the coating roller 801 makes a round and returns, it is collected in the liquid holding space S. Therefore, there is no problem even if the application roller 801 is continuously rotated in the state where there is no sheet in the nip portion N4.
- the coating liquid is not dried.
- the coating solution dries on the surface of the application roller 801, the surface of the backup roller 802, and the outside of the nip portions N5 and N6 between the application roller 801 and the abutting member 852 and the inclusions of the coating solution are precipitated. May stick.
- by rotating the application roller 801 for a while before the liquid application operation to the sheet is started it is possible to remelt the fixed matter and to cancel the fixation.
- the coating amount of the coating liquid is large at the central portion of the sheet and both ends To reduce it.
- the tension is applied to the center of the sheet by the tension applying device 101 provided downstream, so that the center of the sheet is stretched in the transport direction, and the length of the center of the sheet in the transport direction is the sheet. Make it uniform with the transport direction length of the end. Furthermore, in the method of aligning with the length of the sheet end extended by the stationary device, by adding moisture between the fibers of the sheet, the hydrogen bond between the fibers is separated, and the lengths of the center and the end of the sheet are equalized. Promote the This can improve the end rippling of the sheet.
- FIG. 39 shows the result of the change of the moisture content to the sheet in the present example performed by the inventor.
- the change with time of the moisture content of the sheet A which has passed through the fixing device (300 mm / s) and the sheet B which has passed through the water applying device 800 after passing through the fixing device (300 mm / s) is shown.
- the broken line indicates the change of the moisture content of the sheet A
- the solid line indicates the change of the water content of the sheet B.
- the sheet immediately after passing through the fixing device is heated by the fixing nip portion, the moisture content of the sheet is lower than before passing. After that, the moisture content of the sheet tends to increase slightly.
- the sheet B which has passed through the fixing device (300 mm / s) and the water application device 800 has an increased amount of water compared to the sheet A due to the effect of the water application.
- the amount of applied water by the water application device 800 is set so that the tension applying device 101 according to the present embodiment exerts an effect of extending the length of the central portion of the sheet in a predetermined sheet.
- FIG. 18B shows the result of the sheet A having passed the fixing device shown above at 300 mm / s
- FIG. 18C shows the result of applying water after passing the fixing device shown above at 300 mm / s. This is the result of the sheet B that has passed through the device 800.
- the sheet after leaving for one day after passing through the tension applying device The elongation amount of the center length L center of is approximately 0.6 mm.
- the elongation amount of the end length L edge is 0.6 mm, and the difference between the end and the center length is 0 mm. That is, by applying the moisture by the moisture applying device 800 and further pulling the central portion of the sheet P by the effect of the tension applying device in the present embodiment, as a result, the amounts of elongation at the end and the central portion become substantially equal.
- the maximum waving amount was 3.3 mm as shown in FIG. 18 (a), but 1.0 mm as shown in FIG. 18 (c). That is, it improved to about 1/3.
- the water content of the sheet exhibiting the above effect is 8% or more in a certain predetermined paper type.
- FIG. 40 is a view showing the relationship of the amount of water in the width direction when the sheet is coated with water by the water applying apparatus according to the present embodiment.
- the water content at the central portion in the sheet width direction is made larger than the water content at both ends as shown in FIG.
- the amount of water applied to the central portion of the sheet is increased to preferentially separate hydrogen bonds between fibers in the central portion of the sheet and to promote expansion and contraction of the sheet due to application of tension to the central portion of the sheet.
- the equalization of the length of the end / central portion of the sheet can be further promoted, and the end waving can be further improved.
- a method (chamber method) of supplying the liquid to the sheet while allowing the chamber holding the liquid to be in contact with the application roller is illustrated as the application method to the sheet.
- the application method is not limited to the above method, and any other method may be used as long as the sheet having passed through the fixing device can be humidified to a predetermined moisture amount.
- the application roller method (see FIG. 41) disclosed in Japanese Patent Laid-Open No. 2006-154609 may be used.
- FIG. 41 is a schematic cross-sectional view illustrating the application roller type water addition apparatus.
- the coating roller 801 and the backup roller 802 are both formed by forming porous layers 801b and 802b consisting of porous urethane rubber etc. on shaft cores 801a and 802a consisting of a rigid body such as metal and hard resin. is there.
- the porous layers 801 b and 802 b receive the supply of water from the surface, and form a porous surface that applies moisture to the sheet P and humidifies it.
- a water supply roller 804 as a water supply means contacts the application roller 801 to supply water from the surface.
- the water supply roller 804 is a roller composed of a shaft core 804a made of a rigid body such as metal and hard resin, and a porous layer 804b made of porous urethane rubber etc. formed on the shaft core 804a.
- the water supply roller 804 it is also possible to use a roller or pad having only the porous material without the shaft core 804a. It is preferable that the water supply roller 804 be provided with the porous layer 804 b as described above in order to quickly supply water to the application roller 801 at startup. However, it is not always necessary to provide a porous layer, and a material having a hydrophilic surface capable of retaining water on the surface without absorbing water, such as metal, hydrophilic resin or solid treated It is also possible to use a roller made of rubber.
- the restricting member 803 constituting the restricting means is a restricting member made of a rigid body such as a round bar-like metal or hard resin.
- the regulating member 803 is in pressure contact with the application roller 801 to suppress the moisture contained in the surface portion of the porous layer 801 b and to regulate the amount of moisture supplied to the sheet P. That is, the regulating member 803 is in pressure contact with the porous layer 801 b of the application roller 801 to deform the porous layer 801 b and squeeze water contained in the porous layer 801 b.
- the amount of water applied to the sheet P is regulated, the sheet P is appropriately humidified, and the stickiness and the like of the sheet P due to excessive humidification is prevented.
- contact pressure adjusting means not shown
- the application roller 801, the backup roller 802, and the water supply roller 804 are driven by a motor (not shown) to rotate as shown by an arrow, and the application roller 801 and the backup roller 802 nip and convey the sheet P.
- the sheet P to be conveyed is humidified at the nip portion between the application roller 801 and the backup roller 802 with water which has leaked from the porous layer.
- the amount of water supplied to the sheet P is regulated to an appropriate amount by squeezing with the regulating member 803.
- the regulating member 803 is in pressure contact with the application roller 801 to regulate the amount of water supplied, but may be rotated following the application roller 801 or may be in pressure contact without rotation. Further, the pressure when the regulating member 803 is in pressure contact is appropriately set. Furthermore, water may be supplied from the water supply roller 804 to the backup roller 802 from the lower application roller 801. In addition, the application roller 801 and the water supply roller 804 may be disposed on the upper side, and water may be supplied to the lower backup roller 802, or water may be supplied to the upper and lower rollers 801 and 802. .
- the sheet P to be conveyed is appropriately humidified. Therefore, due to the insufficient humidification, the corrugation of the sheet P is not sufficiently corrected, or the excessive sheets cause the deposited sheets P to adhere to each other, and the toner forming the image on the contacting member, sheet, etc. Is well prevented.
- the backup roller 802 can be moved to an upper position shown by a dotted line with respect to the application roller 801. That is, when the apparatus is stopped, the backup roller 802 is set at the position of the dotted line, and by separating from the application roller 801, deformation of the rollers 801 and 802 can be prevented. Similarly, when the regulating member 803 is stopped, it can be moved to the position shown by the dotted line and separated from the application roller 201. Thereby, the deformation of the rollers 801 and 802 is prevented.
- Example 7 In the present embodiment, the same configuration as the above-described embodiment is adopted except that the application to one side or both sides of the sheet is selectively enabled, and the description other than the characteristic portion is omitted.
- an ink jet head discharge method as disclosed in JP-A-2009-268972 is used.
- FIG. 42 is a cross-sectional view for explaining a water applying apparatus according to this embodiment.
- the water application device 800 is provided on the downstream side of the fixing device in the conveyance direction of the sheet P (the arrow direction in FIG. 42), and adds water to the sheet P which has passed the fixing device.
- the water application device 800 has a water addition means for adding water to the sheet P to be conveyed.
- spray nozzles 810 and 810 for spraying water (aqueous solution) onto the sheet are provided as the water addition means.
- the spray nozzles 810 and 810 are respectively disposed on the front and back sides of the sheet across the sheet conveyance path, and are provided so that water (here, water) can be added directly to both sides or one side of the sheet. ing.
- the amount of applied water by the spray nozzles 810 can be controlled by the CPU in the width direction orthogonal to the sheet conveyance direction. That is, the amount of spraying on the sheet is controlled such that the water content is added to the central portion of the sheet in the width direction of the sheet by the CPU more than at both ends.
- the spray nozzles 810, 810 can add more accurate amounts of water to different areas of the sheet. That is, the distribution of the moisture content can be formed in the width direction of the sheet, and the effect of reducing the difference in sheet length between the central portion and the end portion of the sheet by the tension applying device 101 can be enhanced. As a result, it is possible to improve the waving of the sheet end due to the difference between the sheet lengths at the center and the end of the sheet.
- only one of the two spray nozzles can be used as needed.
- the one spray nozzle can add more water to the selected central area of the front or back side of the sheet compared to the end area.
- FIG. 42 exemplifies a configuration in which water is directly added to the sheet from the spray nozzle, but the present invention is not limited to this, and water is indirectly added from the spray nozzle as shown in FIG. Configuration is also possible.
- FIG. 43 is a cross-sectional view for explaining a water applying apparatus according to this embodiment.
- the water application device 800 includes water jet nozzles 810, 810 and a coating roller 801, each having a large number of discharge ports for discharging water on the front and back sides of the sheet as water addition means.
- a reference numeral 802 and restricting members 822, 822 are provided. Except for the configuration in which the water jet nozzles 810 and 810 apply moisture to the application rollers 801 and 802, the same mechanism as that in FIG. 42 is used.
- the water jet nozzles 810, 810 apply moisture to the surfaces of the application rollers 801, 802.
- the regulating member 822 is in pressure contact with the application roller 802 to regulate the amount of water supplied, but may be rotated following the application roller 802 or may be in pressure contact without rotation. In addition, the pressure when the regulating member 822 is in pressure contact is appropriately set.
- the conveyed sheet P is appropriately humidified. Therefore, the effect of reducing the difference in sheet length between the center portion and the end portion in the width direction of the sheet by the tension applying device 101 can be enhanced.
- a vaporization method, a vapor method, or the like may be used as a means of atomizing the water.
- humidification is performed by evaporating water at normal temperature.
- the steam system is a system in which moisture is boiled by electric heat, and the steam is released and diffused by a fan to humidify it. Although inferior in that it uses a large amount of energy, it has the advantages of easy control and good humidification efficiency.
- the application roller shown in Example 1 is opposingly arrange
- the amount of water applied to the central portion of the sheet is increased by making the amount of water at the central portion in the sheet width direction larger than that at both ends, and hydrogen bonding between fibers in the central portion of the sheet is prioritized.
- the equalization of the length of the end / central portion of the sheet can be further promoted, and the end waving can be further improved.
- Example 8 An image forming apparatus provided with the sheet processing apparatus according to the present embodiment will be described with reference to FIGS. In the following description, the image forming apparatus will be described first, and then the sheet processing apparatus will be described. In the present embodiment, an image forming system in which the sheet processing apparatus is connected to the outside of the image forming apparatus will be described. However, the present invention is also applicable to an image forming system in which the sheet processing apparatus is integrally incorporated in the image forming apparatus. The invention is effective.
- FIG. 44 is a cross-sectional view schematically showing a color electrophotographic printer 500 which is an example of an image forming apparatus, and a sheet rippling correction apparatus 900 including a tension applying device which is an example of a sheet processing apparatus and a water addition apparatus.
- FIG. 2 is a cross-sectional view of the sheet in the sheet conveying direction.
- a color electrophotographic printer is simply referred to as a "printer”.
- the sheet is one on which a toner image is formed.
- Specific examples of the sheet include plain paper, resin-like sheet substitutes for plain paper, thick paper, and overhead projectors.
- the printer 500 shown in FIG. 44 has the same configuration as the printer 500 described with reference to FIG. 1 in the first embodiment described above. Therefore, members having the same functions are denoted by the same reference numerals, and the description thereof is used. It shall be, and detailed explanation is omitted here.
- the sheet P on which the toner image is fixed by the fixing device 100 is sent to the sheet rippling correction device 900 by the discharge roller pair 540.
- the sheet P is conveyed along the conveyance guide 902 by the entrance roller pair 901 of the sheet corrugating correction device 900, and after the conveyance direction is turned vertically downward (direction of arrow B in FIG. 44) by the conveyance guide 902, It is sent to the sheet humidifier 400 as a moisture addition means.
- the sheet P is humidified by the humidification roller pair 401 and 402.
- the sheets P discharged from the sheet humidifying device 400 are successively sent to the sheet pulling and conveying devices 101, 201, and 301 as tension applying devices. After being humidified to a predetermined moisture content or more by the sheet humidifying device 400, the sheet stretching and conveying devices 101, 201, and 301 are sequentially passed, and the central portion in the width direction orthogonal to the sheet conveying direction is pulled in the conveying direction. Reduce the difference in length between the end of the sheet and the center sheet in the transport direction.
- the sheet P having the improved undulation at the end portion in the width direction of the sheet is transferred by the transfer guides 903 and 905 while the transfer direction is changed vertically upward (in the direction of arrow C in FIG. 44).
- the sheet is conveyed by the pair 904 and sent to the sheet drying apparatus 700.
- the sheet drying apparatus 700 the sheet P is dried.
- the dried sheet P is conveyed by the conveyance roller pair 906, 908 while being guided by the conveyance guides 907, 909, discharged by the discharge roller pair 910 out of the sheet rippling correction device 900, and stacked on the discharge tray 565.
- reference numeral 400A denotes a water storage tank in which a humidifying liquid L for humidifying the sheet P is stored.
- the humidifying liquid L stored in the water storage tank 400A is optionally supplied with water toward the water supply pipes 411 and 412 provided in the sheet humidifying apparatus 400 by the pump 400B through the water supply pipe 400C as needed.
- the humidifying liquid L contains water as a main component.
- FIG. 45 is a block diagram showing the control relationship between the printer 500 forming the image forming system and the sheet rippling correction apparatus 900 as a whole.
- the control unit 500C of the printer 500 and the control unit 901C of the sheet ruffle correction apparatus 900 are a computer system having a CPU, a memory, an arithmetic unit, an I / O port, a communication interface, a drive circuit, and the like.
- control by each of the control units 500C and 901C described above is performed by each CPU executing a predetermined program stored in the memory.
- the control unit 901C of the sheet rippling correction device 900 controls the operations of the sheet humidifying device 400, the sheet stretching and conveying devices 101, 201, and 301, and the sheet drying device 700 that constitute the device. Further, the above-described control units 500C and 901C can be connected via the communication unit COM to exchange information.
- the sheet humidifying device 400 has the same configuration as the sheet humidifying device 400 described with reference to FIG. 3 in the first embodiment described above, so members having the same functions are denoted by the same reference numerals. The description is incorporated herein, and the detailed description is omitted here.
- the sheet tension conveyance devices 101, 201, and 301 have the same configuration as the sheet tension conveyance devices 101, 201, and 301 described with reference to FIGS. Therefore, members having the same function are denoted by the same reference numerals, and the description thereof is incorporated herein, and the detailed description is omitted here.
- the sheet rippling correction device 900 of this embodiment Since the device is not included, its configuration is shown in FIG.
- seat tension conveyance apparatus 101,201,301 shown in FIG. 46 is the same as that of the sheet tension conveyance apparatus 101,201,301 shown in FIG. 4, the same code
- FIG. 47 is a front cross-sectional view of the sheet drying apparatus 700.
- FIG. FIG. 49 is a perspective view of the sheet drying apparatus 700, and
- FIG. 49 is a left side view of the sheet drying apparatus 700.
- the sheet P in which the waving at the end portion in the width direction of the sheet is improved is sent to the sheet drying device 700 by the pair of transport rollers 904 while being guided by the transport guides 903 and 905.
- the moisture content of the sheet P discharged from the sheet stretching and conveying apparatus 101, 201, 301 is about 7%, and the moisture content is higher than the moisture content of about 5.5% in the normal environment.
- the sheet when discharged out of the apparatus after corrugation correction with high sheet moisture content, the sheet is gradually dried from the upper surface of the discharged sheet, and the sheet curls to the upper surface due to the drying. Occurs.
- a sheet drying device 700 is provided on the downstream side of the sheet pulling and conveying devices 101, 201, 301.
- fan guides 702 and 704 are attached to the upper surface side of the two conveyance guides 905, fan guides 703 and 705 are attached to the lower surface side, and the fan 701 is attached to each fan guide. Each is attached. That is, the fan 701 is provided on one side and the other side of the sheet across the sheet conveyance path.
- four fans 701 are respectively attached in the depth direction of FIG. 47 (the width direction orthogonal to the sheet conveying direction), and a total of 16 fans 701 are arranged in combination of the upper surface side and the lower surface side.
- the fan guides 702 and 704 are rib guides having holes, through which the air of the fan 701 passes.
- FIG. 49 shows only the upper surface side for explanation, the fan guides 703 and 705 on the lower surface side also have the same rib guide shape.
- the fans 701 are all turned on immediately before the sheet passes, and are turned off when the sheet passing job is completed.
- the operation of the fan 701 is controlled by a control unit 901C shown in FIG.
- the sheet P passed through the sheet tension conveying devices 101, 201, 301 and the curl correcting device 600 is continuously It mounts on the surface plate 650 for measurement shown in FIG.
- the end length of the sheet P in the sheet conveyance direction is L edge [mm]
- the center length is L center [mm].
- a curved shape Pwave produced at the upper side or lower side of the sheet P shown in FIG. 8, that is, the end in the width direction orthogonal to the transport direction is referred to as end wave, and among them, the gap with the measurement surface plate 650
- the maximum amount X was taken as the amount of corrugation, and the maximum one Y max among the distances from the measurement surface plate 650 at the four corner ends of the sheet P was evaluated as the maximum amount of curl.
- FIG. 50 shows the results of the effect confirmation experiment of the tension applying device and the sheet drying device in the present example performed by the present inventors.
- the sheet moisture amount immediately after passing through the sheet humidifying device 400 is 7%.
- the environmental humidity is 50%.
- the measurement of the moisture content of the sheet in the present embodiment was performed by the present inventors using the sheet P immediately after the sheet P passes through the sheet waving correction device 900 and is discharged onto the discharge tray 565.
- a microwave type paper moisture meter was used.
- FIG. 50A shows a state in which the sheet rippling correction device 900 is not passed immediately after passing through the fixing device 100
- FIG. 50B shows a state in which the fan 701 of the sheet drying device 700 is turned OFF
- the X max [mm] and the maximum curl amount Y max [mm] were measured.
- the expansion amount of the central length L center of the sheet P is 0 mm, whereas the expansion amount of the end length L edge is 0.6 mm, The end is longer than the center by 0.6 mm.
- the maximum waving amount X max was as large as 3.3 mm.
- the maximum curling amount Y max was 5.0 mm.
- the sheet moisture content immediately after the sheet waving correction device 900 was discharged was 4.0%.
- the central length L center of the sheet P is extended by 0.6 mm, and a sufficient tensile effect can be obtained.
- the maximum waving amount X max was reduced to 1.0 mm and about 1/3. However, the maximum curling amount Y max increased to 10 mm. At this time, the sheet moisture amount immediately after the sheet waving correction device 900 was discharged was 7.0%.
- the central length L center of the sheet P is extended by 0.6 mm, and a sufficient tensile effect can be obtained.
- the maximum waving amount X max was reduced to 1.0 mm.
- the maximum curling amount Y max was improved to 1.0 mm.
- the sheet moisture amount immediately after discharge of the sheet waving correction device 900 was 5.5%.
- the sheet drying device 700 As described above, by arranging the sheet drying device 700 on the downstream side in the conveyance direction of the sheet pulling and conveying devices 101, 201, and 301, it has been confirmed that the curling is improved while correcting the corrugation of the sheet. At this time, since it is known in advance by experiments etc. by the surface of the sheet to which the toner is transferred, the density of the toner, the size of the sheet humidification amount, etc., the air volume of the fans 701 and 701 used according to the direction of the curl. Is selectable for each sheet.
- the sheet information sent to the CPU in the image forming apparatus and the control unit having the memory the image density information of the toner image on the sheet P on which the image is formed, the temperature and humidity information by the environment sensor 500D, and the humidification amount information.
- the curl can be adjusted for each sheet.
- the configuration using the fan 701 is illustrated as the sheet drying apparatus 700, but the present invention is not limited to this configuration.
- a fan may be used which has a heater.
- the sheet may be dried while being conveyed by contact with the surface of the sheet using a heating roller.
- the water adding means exemplifies a structure in which water is added more to the central portion in the width direction of the sheet than to both ends, but the central portion without adding water to the both ends in the width direction of the sheet Water may be added only to the part. Also in this configuration, as in the embodiments described above, it is possible to further reduce the corrugation of the sheet.
- the tension applying device integrally included in the image forming apparatus is illustrated, but the present invention is not limited to this.
- the image forming apparatus may be a tension applying device that is detachable as an optional external device, and by applying the present invention to the tension applying device, the same effect as the entire image forming system can be obtained.
- the tension applying device may have a control unit and the control may be configured to control the operation.
- the control unit of the tension application device may be controlled by the control unit of the image forming apparatus to control the operation of the tension application device. The same effect can be obtained even with this configuration.
- the printer is exemplified as the image forming apparatus, but the present invention is not limited to this.
- it may be another image forming apparatus such as a copying machine or a facsimile machine, or another image forming apparatus such as a complex machine combining these functions.
- an image forming apparatus has been exemplified, which uses an intermediate transfer member, sequentially superimposes and transfers toner images of respective colors on the intermediate transfer member, and collectively transfers the toner images carried on the intermediate transfer member onto a sheet. Not limited to this.
- the image forming apparatus may use a sheet carrier and sequentially transfer the toner images of the respective colors onto the sheet carried on the sheet carrier, and the image forming apparatus or the tension applying device of the image forming apparatus may be used. Similar effects can be obtained by applying the present invention.
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- Mechanical Engineering (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Paper Feeding For Electrophotography (AREA)
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- Electrophotography Configuration And Component (AREA)
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Abstract
Description
本実施例に係るシート処理装置を備えた画像形成装置について、図1~図10を用いて説明する。以下の説明では、まず画像形成装置について説明し、次にシート処理装置について説明する。本実施例においては、シート処理装置を画像形成装置の外部に接続した画像形成システムについて説明するが、シート処理装置を画像形成装置の内部に一体的に組み込んだ画像形成システムの構成であっても本発明は有効である。
本実施例に係る張力付与装置を備えた画像形成装置について、図11~図17及び図8を用いて説明する。なお、詳細説明のために、一部部品を省略している。以下の説明では、まず画像形成装置について説明し、次に定着装置について説明し、次に張力付与装置について説明する。本実施例においては、張力付与装置を画像形成装置内部に一体的に組み込んだ画像形成システムについて説明するが、張力付与装置を画像形成装置の外部に接続した画像形成システムの構成であっても本発明は有効である。
図20~図23を用いて説明する。本実施例では実施例2の駆動機構のみを変更している点以外は同じ構成を採用しているので説明を省略する。
本実施例に係るシート処理装置を備えた画像形成装置について、図24~図29を用いて説明する。以下の説明では、まず画像形成装置について説明し、次にシート処理装置について説明する。本実施例においては、シート処理装置を画像形成装置の外部に接続した画像形成システムについて説明するが、シート処理装置を画像形成装置内部に一体的に組み込んだ画像形成システムの構成であっても本発明は有効である。
図30~図34を用いて本実施例のシート波打ち補正装置900のシート加湿装置400について説明する。
図35~図39を用いて実施例6について説明する。図35は実施例6の水分塗布装置及び張力付与装置を示す断面図である。図36は実施例6の水分塗布装置を示す断面図である。図37(a)は実施例6の水分塗布装置を示す上面図、図37(b)は実施例6の水分塗布装置を説明する正面図である。図38(a)は実施例6の水分塗布装置における循環流量と圧力の関係を示すグラフ、図38(b)は実施例6の水分塗布装置における循環流量と塗布量の関係を示すグラフである。図39は実験による用紙の水分量の変化を示すグラフである。
本実施例では、シートに対し片面もしくは両面への塗布を選択的に可能にしている点以外は、前述した実施例と同じ構成を採用しているので、特徴部分以外の説明を省略する。
本実施例に係るシート処理装置を備えた画像形成装置について、図44~図50を用いて説明する。以下の説明では、まず画像形成装置について説明し、次にシート処理装置について説明する。本実施例においては、シート処理装置を画像形成装置の外部に接続した画像形成システムについて説明するが、シート処理装置を画像形成装置内部に一体的に組み込んだ画像形成システムの構成であっても本発明は有効である。
前述した実施例では、水分付加手段が、シートの幅方向の中央部に、両端部より多く水分を付加する構成を例示したが、シートの幅方向の両端部に水分を付加することなく、中央部にのみ水分を付加する構成としてもよい。この構成によっても、上述した各実施例と同様に、シートの波打ちをより低減することができる。
L …加湿液、塗布液
M,M1,M2,M3,M32,M52,M61,M62,M63 …モータ
N,N1,N2,N4,N5,N6 …ニップ部
P …シート
S …液体保持空間
T …トナー
Pwave …端部波打ち
Xmax …波打ち量
L center …シートの中央における搬送方向長さ
L edge …シートの端部における搬送方向長さ
100 …定着装置
101,201,301 …シート引張装置、張力付与装置
103 …シートセンサ
104 …第一上ローラ
105 …第一下ローラ
106 …第二上ローラ
107 …第二下ローラ
110 …定着ローラ
111 …加圧ローラ
123,124,125,126,127,128,129,130 …駆動伝達ギア
131 …負荷手段
134 …圧解除カム
400 …シート加湿装置
400A …貯水タンク
400B …ポンプ
400C …給水管
400C1 …分岐部
401,402 …加湿ローラ対
403,404,409,410 …規制ローラ
405,406,407,408 …給水ローラ
411,412 …給水漕
411a,412a …給水孔
420 …加圧バネ
450 …シート加湿装置
451 …シャッター
452 …噴出口
500 …プリンタ
500C …制御部
500D …環境センサ
510 …画像形成部
600 …カール矯正装置
601 …カール矯正部
603 …スポンジローラ
604 …剛体ローラ
609 …バックアップコロ
700 …シート乾燥装置
701 …ファン
702,703,704,705 …ファンガイド
800 …水分塗布装置
801 …塗布ローラ
802 …バックアップローラ
803,822 …規制部材
804 …給水ローラ
810,810 …噴霧ノズル
850 …液体保持部材
900 …シート波打ち補正装置
901C …制御部
Claims (25)
- シートに対して処理を施すシート処理装置において、
シートの搬送方向に間隔をおいて設けられた複数のローラ対がシートを挟持して搬送することにより、シートの搬送方向と直交する幅方向における中央部の領域に搬送方向の張力をシートに与える張力付与装置を備えたことを特徴とするシート処理装置。 - 前記複数のローラ対は、
回転可能な第1のローラと、前記第1のローラに圧接されニップを形成してシートを挟持して搬送する第1の加圧ローラからなる第1のローラ対と、
回転可能な第2のローラと、前記第2のローラに圧接されニップを形成してシートを挟持して搬送する第2の加圧ローラからなり前記第1のローラ対の搬送方向下流にある第2のローラ対と、
を有し、
前記第1のローラ、前記第1の加圧ローラ、前記第2のローラ、前記第2の加圧ローラのうち少なくとも一つのローラの前記幅方向の長さが最大シートの幅方向の長さより短いことを特徴とする請求項1に記載のシート処理装置。 - 前記複数のローラ対は、
回転可能な第1のローラと、前記第1のローラに圧接されニップを形成してシートを挟持して搬送する第1の加圧ローラからなる第1のローラ対と、
回転可能な第2のローラと、前記第2のローラに圧接されニップを形成してシートを挟持して搬送する第2の加圧ローラからなり前記第1のローラ対の搬送方向下流にある第2のローラ対と、
を有し、
前記第1のローラ、前記第1の加圧ローラ、前記第2のローラ、前記第2の加圧ローラのうち少なくとも一つのローラの外径は、少なくとも一部が回転軸方向で変化し、回転軸方向中央部の方が回転軸方向端部よりも大きいことを特徴とする請求項1に記載のシート処理装置。 - 前記複数のローラ対は、
回転可能な第1のローラと、前記第1のローラに圧接されニップを形成してシートを挟持して搬送する第1の加圧ローラからなる第1のローラ対と、
回転可能な第2のローラと、前記第2のローラに圧接されニップを形成してシートを挟持して搬送する第2の加圧ローラからなり前記第1のローラ対の搬送方向下流にある第2のローラ対と、
を有し、
前記第1のローラと前記第2のローラを回転駆動させる駆動手段と、
前記第1のローラと駆動伝達部材により連結され、前記第1のローラに所定の負荷トルクを与える負荷手段と、
前記駆動手段による前記第1のローラ対への駆動力の伝達を制御する駆動制御手段と、を設け、
前記駆動制御手段は、前記第2のローラ対のニップにシートが挟持される前は、前記第1のローラ対への駆動力の伝達を行い、前記第2のローラ対のニップにシートが挟持された後は、前記第1のローラへの駆動力の伝達を行わないことを特徴とする請求項1乃至請求項3のいずれか1項に記載のシート処理装置。 - 前記駆動制御手段がクラッチ手段であることを特徴とする請求項4に記載のシート処理装置。
- 前記複数のローラ対は、
回転可能な第1のローラと、前記第1のローラに圧接されニップを形成してシートを挟持して搬送する第1の加圧ローラからなる第1のローラ対と、
回転可能な第2のローラと、前記第2のローラに圧接されニップを形成してシートを挟持して搬送する第2の加圧ローラからなり前記第1のローラ対の下流にある第2のローラ対と、
を有し、
前記第2のローラを回転駆動させる駆動手段と、
前記第1のローラと駆動伝達部材により連結され、前記第1のローラに所定の負荷トルクを与える負荷手段と、
前記第1の加圧ローラの前記第1のローラに対する加圧力を解除する圧解除手段と、を設け、
前記第2のローラ対のニップにシートが挟持される前は、前記第1の加圧ローラは前記圧解除手段により前記第1のローラに対して圧解除状態となり、前記第2のローラ対のニップにシートが挟持された後は、前記第1の加圧ローラは前記圧解除手段により前記第1のローラに対して加圧状態となることを特徴とする請求項1乃至請求項3のいずれか1項に記載のシート処理装置。 - 前記第2のローラ対のニップ部から上流側に向かって所定の距離にシートを検知するシート検知手段を設け、
前記シート検知手段から前記第2のローラ対のニップ部までの所定の距離と前記シートの搬送速度から、前記第2のローラ対のニップ部にシートが挟持されたことを判断する特徴とする請求項2乃至請求項6のいずれか1項に記載のシート処理装置。 - さらに、シートに水分を付加するする水分付加手段を備え、
前記水分付加手段を、前記複数のローラ対よりシート搬送方向の上流に配置したことを特徴とする請求項1乃至請求項7のいずれか1項に記載のシート処理装置。 - 前記水分付加手段は、シートの搬送方向と直交する幅方向の中央部に、両端部より多く水分を付加することを特徴とする請求項8に記載のシート処理装置。
- 前記水分付加手段は、シートの搬送方向と直交する幅方向の中央部にのみ水分を付加することを特徴とする請求項8に記載のシート処理装置。
- 前記水分付加手段は、シートに液体を塗布するための塗布ローラと、前記塗布ローラに当接して形成される液体保持空間に液体を保持する液体保持部材とを備え、前記塗布ローラを回転させることにより、前記液体保持部材より塗布ローラの表面に供給された液体をシートに塗布することを特徴とする請求項8乃至請求項10のいずれか1項に記載のシート処理装置。
- 前記水分付加手段は、シートに水分を噴霧する噴霧ノズル又はシートに水分を吐出する多数の吐出口を備えたウォータージェットノズルを有し、前記ノズルからシートに対して直接水分を付加することを特徴とする請求項8乃至請求項10のいずれか1項に記載のシート処理装置。
- 前記水分付加手段は、シートに液体を塗布するための塗布ローラと、前記塗布ローラに水分を噴霧する噴霧ノズル又は前記塗布ローラに水分を吐出する多数の吐出口を備えたウォータージェットノズルと、を有し、前記ノズルからシートに対して間接的に水分を付加することを特徴とする請求項8乃至請求項10のいずれか1項に記載のシート処理装置。
- 前記水分付加手段がシートの搬送経路を挟んでシートの表面側と裏面側にそれぞれ配置されており、シートの両面もしくは片面に水分を付加することを特徴とする請求項8乃至請求項13のいずれか1項に記載のシート処理装置。
- 前記水分付加手段は、シートに水分を噴霧するための複数の噴出口を設け、隣り合う噴出口からシートへの噴霧領域が重なりあうように噴出口の大きさ、間隔、噴霧角度を設定したことを特徴とする請求項8乃至請求項14のいずれか1項に記載のシート処理装置。
- シートを略鉛直方向上方から下方へ案内する搬送経路を備え、
前記搬送経路に、前記水分付加手段と前記張力付与装置を順に配置したことを特徴とする請求項8乃至請求項15のいずれか1項に記載のシート処理装置。 - さらに、シートのカールを矯正するカール矯正手段を備え、
前記カール矯正手段を、前記複数のローラ対よりシート搬送方向の下流に配置したことを特徴とする請求項1乃至請求項7のいずれか1項に記載のシート処理装置。 - 前記カール矯正手段は、弾性ローラと剛体ローラとを圧接して形成した湾曲形状のニップ部にてシートを挟持して搬送することでカールを矯正することを特徴とする請求項17に記載のシート処理装置。
- 前記カール矯正手段は、複数のローラに張架された無端状のベルトと剛体ローラとを圧接して形成した湾曲形状のニップ部にてシートを挟持して搬送することでカールを矯正することを特徴とする請求項17に記載のシート処理装置。
- 前記カール矯正手段は、シートの一方の面側に凸状のカールを矯正する第一のカール矯正部と、シートの他方の面側に凸状のカールを矯正する第二のカール矯正部と、を有することを特徴とする請求項17乃至請求項19のいずれか1項に記載のシート処理装置。
- さらに、シートを乾燥させるシート乾燥手段を備え、
前記シート乾燥手段を、前記複数のローラ対よりシート搬送方向の下流に配置したことを特徴とする請求項1乃至請求項7のいずれか1項に記載のシート処理装置。 - 前記シート乾燥手段は、エアを送るファンであることを特徴とする請求項21に記載のシート処理装置。
- 前記シート乾燥手段は、エアを送るファンにヒータを備えたドライヤであることを特徴とする請求項21に記載のシート処理装置。
- 前記シート乾燥手段は、シートの一方の面側と他方の面側にそれぞれ設けられていることを特徴とする請求項21乃至請求項23のいずれか1項に記載のシート処理装置。
- シート上にトナー像を転写する転写部と、
転写されたトナー像を加熱してシート上に定着する定着部と、
シートに対して処理を施す請求項1乃至請求項24のいずれか1項に記載のシート処理装置と、
を備えたことを特徴とする画像形成システム。
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Also Published As
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US20140205317A1 (en) | 2014-07-24 |
US9546061B2 (en) | 2017-01-17 |
US20160070224A1 (en) | 2016-03-10 |
JPWO2014069307A1 (ja) | 2016-09-08 |
CN104756018A (zh) | 2015-07-01 |
EP2916174A4 (en) | 2016-06-15 |
EP2916174A1 (en) | 2015-09-09 |
US9284142B2 (en) | 2016-03-15 |
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