Apparatus for producing sheet

Abstract

To provide an apparatus for producing sheet capable of forming with high quality.SOLUTION: An apparatus for producing sheet includes: a first frame 400 having a deposition belt 61a, and a first suction part; and a second frame 500 having a conveyor belt 62a, and a second suction part, where an eccentric cam 330 is provided between the first frame 400 and the second frame 500, and a position of the second frame 500 to the first frame 400 is changed according to rotation of the eccentric cam 330.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a sheet manufacturing apparatus. [Background technology]

[0002] Patent Document 1 discloses the configuration of a sheet manufacturing apparatus equipped with an intermediate conveying section that conveys the web downstream while sucking the web vertically upward, i.e., functions as a back conveying belt. A mesh belt is disposed below the intermediate conveying section on the upstream side of the intermediate conveying section. That is, the web passes through the gap between the intermediate conveying section and the mesh belt. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-185622 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the method described in Patent Document 1 does not have both functions, such as a narrow gap being preferable when the web is sucked into the intermediate conveying section, and a wide gap being preferable when the web is torn off. In other words, there is a demand for conveying the web with an appropriate gap during the process of conveying the web. [Means for solving the problem]

[0005] The sheet manufacturing apparatus is a sheet manufacturing apparatus that manufactures sheets from a material containing fibers, and comprises: a deposition unit that deposits the material using an airflow to form a web, a conveying unit that conveys the web, and a pressure unit that applies pressure to the web to form the sheet. The deposition unit comprises a drum member that stirs the material, a deposition belt on which the material released from the drum member is deposited, a first suction unit that is located on the opposite side of the deposition belt from the drum member and that applies suction so that the material is deposited on the deposition belt, and a first frame in which the deposition belt and the first suction unit are installed. The conveying unit comprises a conveying belt that contacts one side of the web to hold the web, a second suction unit that is located above the conveying belt and that applies suction to adsorb the web, and a second frame in which the conveying belt and the second suction unit are installed. An eccentric cam is provided between the first frame and the second frame, and the position of the second frame relative to the first frame is changed as the eccentric cam rotates. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a sheet manufacturing apparatus. [Figure 2] FIG. 4 is a schematic diagram showing the configuration of the periphery of a second transport unit. [Figure 3] 3 is an enlarged schematic view of part A of the second transport section shown in FIG. 2. FIG. [Figure 4] FIG. [Figure 5A] FIG. [Figure 5B] FIG. [Figure 5C] FIG. [Figure 5D] FIG. [Figure 5E] FIG. [Figure 6] FIG. [Figure 7] FIG. 3 is a cross-sectional view showing the positional relationship between the first frame and the second frame. [Figure 8] FIG. 3 is a cross-sectional view showing the positional relationship between the first frame and the second frame. [Figure 9] FIG. 4 is a perspective view showing the configuration of a detection unit of the cam rotation mechanism. [Figure 10A] 5A and 5B are cross-sectional views showing a driving method of the cam rotation mechanism. [Figure 10B] 10B is an enlarged cross-sectional view of the cam rotation mechanism shown in FIG. 10A. [Figure 11A] 5A and 5B are cross-sectional views showing a driving method of the cam rotation mechanism. [Figure 11B] FIG. 11B is an enlarged cross-sectional view of the cam rotation mechanism shown in FIG. 11A. [Figure 12A] 5A and 5B are cross-sectional views showing a driving method of the cam rotation mechanism. [Figure 12B] FIG. 12B is an enlarged cross-sectional view of the cam rotation mechanism shown in FIG. 12A. [Figure 13A] 5A and 5B are cross-sectional views showing a driving method of the cam rotation mechanism. [Figure 13B] FIG. 13B is an enlarged cross-sectional view of the cam rotation mechanism shown in FIG. 13A. DETAILED DESCRIPTION OF THE INVENTION

[0007] The configuration of the sheet manufacturing apparatus 1 will be described below with reference to the drawings. In the following drawings, three mutually perpendicular axes will be referred to as the X-axis, Y-axis, and Z-axis. The direction along the X-axis is referred to as the "X-direction," the direction along the Y-axis as the "Y-direction," and the direction along the Z-axis as the "Z-direction." The direction of the arrow is the + direction, and the direction opposite to the + direction is referred to as the - direction. Note that a view from the +Z direction or the -Z direction is also referred to as a plan view or planar view. Furthermore, in the sheet manufacturing apparatus 1, the side ahead in the conveying direction of the raw material, web, sheet, etc. is sometimes referred to as downstream, and the side going upstream in the conveying direction is sometimes referred to as upstream.

[0008] First, the configuration of a sheet manufacturing apparatus 1 will be described with reference to FIG.

[0009] The sheet manufacturing apparatus 1 manufactures sheets from a material containing fiber. The sheet manufacturing apparatus 1 also recycles sheets from paper scraps such as waste paper in a dry process. The sheet manufacturing apparatus 1 is not limited to a dry process and may be a wet process. In this specification, the dry process refers to a process carried out in air such as the atmosphere, rather than in a liquid.

[0010] As shown in Fig. 1, the sheet manufacturing apparatus 1 includes a first unit group 101, a second unit group 102, and a third unit group 103. The first unit group 101, the second unit group 102, and the third unit group 103 are supported by a frame (not shown). In Fig. 1, the directions in which waste paper C, sheets P3, slit pieces S, unnecessary scraps, etc. move are indicated by outline arrows.

[0011] The sheet manufacturing apparatus 1 manufactures a sheet P3 from recycled paper C, which is a material containing fibers. In the sheet manufacturing apparatus 1, a first unit group 101, a third unit group 103, and a second unit group 102 are arranged from the -Y direction to the +Y direction in a side view from the -X direction.

[0012] The waste paper C is transported from the first unit group 101 to the second unit group 102 via a pipe 21 that crosses the third unit group 103. The waste paper C is defibrated in the second unit group 102 to form fibers, and then made into a mixture containing a binder and the like.

[0013] The mixture is transported to the third unit group 103 via the pipe 24. The mixture is made into a web W in the third unit group 103 and then formed into a belt-shaped sheet P1. The belt-shaped sheet P1 is cut in the first unit group 101 to become a sheet P3.

[0014] The first unit group 101 has a buffer tank 13, a constant volume supply unit 15, a junction unit 17, and a pipe 21. In the first unit group 101, these components are arranged in the above order from upstream to downstream. The first unit group 101 also has a first cutting unit 81, a second cutting unit 82, a tray 84, and a shredding unit 86.

[0015] The first cutting unit 81 and the second cutting unit 82 cut the strip-shaped sheet P1 into sheets P3 of a predetermined shape. Furthermore, the first unit group 101 has a water supply unit 67. The water supply unit 67 is a water storage tank. The water supply unit 67 supplies water for humidification to each of a first humidifier unit 65 and a second humidifier unit 66, which serve as humidifiers described below, via a water supply pipe (not shown).

[0016] Waste paper C is fed into the buffer tank 13 from the raw material feed port 11. The waste paper C contains fibers such as cellulose, and is, for example, pieces of shredded waste paper. Humidified air is supplied into the buffer tank 13 from the second humidifier 66 provided in the third unit group 103.

[0017] The waste paper C to be defibrated is temporarily stored in the buffer tank 13, and then transported to the constant quantity supply unit 15 in accordance with the operation of the sheet manufacturing apparatus 1. The sheet manufacturing apparatus 1 may be provided with a shredder upstream of the buffer tank 13 that shreds the waste paper C and the like.

[0018] The fixed-quantity supply unit 15 has a weighing device 15a and a supply mechanism (not shown). The weighing device 15a measures the mass of the waste paper C. The supply mechanism supplies the waste paper C weighed by the weighing device 15a to the downstream junction 17. That is, the fixed-quantity supply unit 15 measures the waste paper C by predetermined mass using the weighing device 15a, and supplies it to the downstream junction 17 using the supply mechanism.

[0019] At the confluence section 17, the waste paper C supplied from the constant volume supply section 15 is combined with the fine fragments of the slit pieces S supplied from the shredding section 86 and mixed together. The slit pieces S and the shredding section 86 will be described later. The waste paper C mixed with the fine fragments flows from the confluence section 17 into the piping 21. The piping 21 transports the waste paper C from the first unit group 101 to the second unit group 102 by an airflow generated by a blower (not shown).

[0020] The second unit group 102 has a defibrating unit 30, which is a dry type defibrator, a separating unit 40, piping 23, a mixing unit 91, and piping 24. In the second unit group 102, these components are arranged in the above order from upstream to downstream. The second unit group 102 also has a collection unit 95, a compressor 97, a power supply unit 99, and piping 25 and airflow piping 29 connected to the separating unit 40.

[0021] The waste paper C transported through the piping 21 flows into the defibrator unit 30. The defibrator unit 30 dry-defibrates the waste paper C, which is a material containing fibers, to generate defibrated material containing fibers. A known defibrator mechanism can be applied to the defibrator unit 30. In this embodiment, a defibrator mechanism equipped with rotary blades is used as the defibrator unit 30. The defibrator mechanism shreds and defibrates the waste paper C with the rotary blades to generate fibers. The defibrator unit 30 untangles the tangled fibers contained in the waste paper C to generate defibrated material containing fibers, and the waste paper C is transported to the separation unit 40.

[0022] The separation unit 40 separates the defibrated fibers. Specifically, the separation unit 40 removes components contained in the fibers that are unnecessary for producing the sheet P3. That is, the separation unit 40 separates relatively long fibers from relatively short fibers. Relatively short fibers may reduce the strength of the sheet P3, so they are selected and removed by the separation unit 40. The separation unit 40 also removes impurities such as coloring materials and additives contained in the waste paper C.

[0023] In this embodiment, a disc-type separation mechanism equipped with a separation filter is used as the separation section 40. The separation mechanism sorts and separates relatively short fibers and impurities that pass through the separation filter from relatively long fibers that do not pass through the separation filter. The relatively long fibers are used as defibrated fibers in the material for the web W. Humidified air is supplied to the interior of the separation section 40 from the second humidifying section 66 of the third unit group 103.

[0024] The defibrated fibers are separated in the separation section 40 to remove relatively short fibers. Then, the fibers are transported to the mixing section 91 via the pipe 23 by an airflow generated by a blower (not shown) located at the tip of the airflow pipe 29. Unwanted materials such as relatively short fibers and impurities are discharged from the pipe 25 to the recovery section 95.

[0025] The mixing section 91 mixes the fibers with a binder and the like in the air to form a mixture. Although not shown, the mixing section 91 is equipped with a flow path for transporting the fibers, a fan, a hopper, a supply pipe, and a valve. The mixture flows from the mixing section 91 into the pipe 24.

[0026] The fan in the mixer 91 generates an airflow that transports the fibers downstream while mixing them with binders and other materials to form a mixture. The collector 95 is equipped with a filter (not shown). The filter filters out unnecessary materials such as relatively short fibers transported through the pipe 25 by the airflow.

[0027] The compressor 97 generates compressed air. The filter may become clogged with fine particles among other unwanted matter. By blowing the compressed air generated by the compressor 97 onto the filter, it is possible to blow away the particles adhering to the filter and clean the filter.

[0028] The power supply unit 99 includes a power supply device (not shown) that supplies power to the sheet manufacturing apparatus 1, and a control unit 5. The power supply unit 99 distributes power supplied from an external source to each component of the sheet manufacturing apparatus 1.

[0029] The control unit 5 includes a central processing unit (CPU) and a storage unit including a random access memory (RAM) and a read-only memory (ROM). The storage unit stores various programs for controlling the sheet manufacturing apparatus 1. The control unit 5 may include dedicated hardware (application-specific integrated circuit: ASIC) that executes at least some of the various processes. That is, the control unit 5 may be configured as a circuit including one or more processors that operate according to a computer program (software), one or more dedicated hardware circuits such as ASIC, or a combination of these.

[0030] The third unit group 103 deposits and compresses the mixture containing fibers to form a belt-shaped sheet P1, which is recycled paper. The third unit group 103 includes a depositing unit 50, a second conveying unit 62 as a conveying unit, a first humidifying unit 65, an air ejecting unit 200, a second humidifying unit 66, a draining unit 68, and a pressurizing unit 70.

[0031] In the third unit group 103, the deposition section 50, the first conveying section 61, the second conveying section 62, the first humidifying section 65, and the pressurizing section 70 are arranged in the above order from upstream to downstream. The air injection section 200 is located inside the second conveying section 62 and is arranged at the downstream end of the conveying path of the web W in the second conveying section 62. The second humidifying section 66 is arranged below the first humidifying section 65.

[0032] The deposition unit 50 deposits the mixture produced from the defibrated material by airflow and gravity to form a web W. The deposition unit 50 has a drum member 53, blade members 55 installed inside the drum member 53, a housing 51 that houses the drum member 53, and a first suction unit 59. The mixture is taken into the drum member 53 from the piping 24.

[0033] A first conveying unit 61 is disposed below the deposition unit 50. The first conveying unit 61 has a deposition belt 61a and five rollers that tension the deposition belt 61a. The first suction unit 59 faces the drum member 53 in the direction along the Z axis, with the deposition belt 61a sandwiched between them.

[0034] The blade member 55 is disposed inside the drum member 53. The blade member 55 is driven to rotate by a motor (not shown). The drum member 53 is a semi-cylindrical sieve. A mesh that functions as a sieve is provided on the downward-facing side of the drum member 53. The drum member 53 allows particles such as fibers and mixtures that are smaller than the size of the mesh openings of the sieve to pass from the inside to the outside.

[0035] The mixture is agitated by rotating blade members 55 inside drum member 53 and then discharged to the outside of drum member 53. Humidified air is supplied to the inside of drum member 53 from second humidifying section 66.

[0036] The first suction section 59 is disposed below the drum member 53. The first suction section 59 sucks air from inside the housing 51 through a plurality of holes in the deposition belt 61a, thereby generating an airflow that deposits the mixture on the deposition belt 61a.

[0037] The multiple holes in the deposition belt 61a allow air to pass through but prevent fibers and binders contained in the mixture from passing through. As a result, the mixture discharged to the outside of the drum member 53 is sucked downward together with the air. The first suction section 59 is a known suction device such as a suction fan. The mixture is dispersed in the air within the housing 51 and, due to gravity and the airflow generated by the first suction section 59, is deposited on the upper surface of the deposition belt 61a to form a web W.

[0038] The deposition belt 61a is an endless belt stretched over five rollers. The deposition belt 61a rotates counterclockwise in FIG. 1 due to the rotation of the rollers. As a result, the mixture is continuously deposited on the deposition belt 61a, forming a web W. The web W contains a relatively large amount of air and is soft and inflated. The first conveying section 61 conveys the formed web W downstream by the rotation of the deposition belt 61a.

[0039] The second conveying section 62 is located downstream of the first conveying section 61 and conveys the web W in place of the first conveying section 61. The second conveying section 62 peels the web W from the upper surface of the deposition belt 61a and conveys it toward the pressing section 70. The second conveying section 62 is located above the conveying path of the web W and slightly upstream of the starting point of the return side of the deposition belt 61a. The +Y direction of the second conveying section 62 and the -Y direction of the deposition belt 61a partially overlap in the vertical direction.

[0040] The second conveying section 62 has a conveying belt 62a, four rollers 63 (see FIG. 2), and a second suction section 62b. The conveying belt 62a has a plurality of holes for allowing air to pass through. The conveying belt 62a is stretched by the four rollers 63, and rotates clockwise in FIG. 1 as the rollers 63 rotate.

[0041] The second suction section 62b is located on the transport path of the web W in the second transport section 62 and is disposed above the transport belt 62a. The second suction section 62b sucks air upward from below through multiple holes in the transport belt 62a. As a result, one side of the web W, which is the upper surface, is adsorbed to the lower surface of the transport belt 62a. When the transport belt 62a rotates in this state, the web W is adsorbed to the transport belt 62a and transported downstream. In other words, the transport belt 62a contacts one side of the web W to transport the web W. The second suction section 62b is a known suction device such as a suction fan.

[0042] The first humidifying section 65 humidifies the web W containing fibers deposited in the depositing section 50 of the third unit group 103. More specifically, the first humidifying section 65 is, for example, a mist-type humidifier, and humidifies the web W transported by the second conveying section 62 by supplying mist M from below. The first humidifying section 65 is disposed below the second conveying section 62 and faces the web W transported by the second conveying section 62 in the direction along the Z axis. A known humidifying device, such as an ultrasonic type, can be used as the first humidifying section 65.

[0043] By humidifying the web W with the mist M, the function of the binder contained in the web W is promoted, and the strength of the sheet P3 is improved. In addition, since the web W is humidified from below, droplets from the mist M are prevented from falling onto the web W. Furthermore, since the web W is humidified from the side opposite to the one side that contacts the conveyor belt 62a, sticking of the web W to the conveyor belt 62a is reduced. The second conveyor unit 62 conveys the web W toward the pressurizing unit 70.

[0044] The air injection unit 200 is located within the second conveying unit 62, downstream of the second suction unit 62b. Although not shown, the air injection unit 200 has a compressed air tank and an injection nozzle. The compressed air tank supplies compressed air to the injection nozzle. The air injection unit 200 injects compressed air downward from the injection nozzle toward the web W. Compressed air is supplied to and stored in the compressed air tank, for example, from a compressor (not shown) for the air injection unit 200.

[0045] The spray nozzle is a long, narrow opening extending in the direction along the X-axis. The spray nozzle faces the web W transported on the conveyor belt 62a in the direction along the Z-axis. The compressed air sprayed from the air spraying unit 200 passes through the conveyor belt 62a and hits one side of the web W that is adsorbed to the lower surface of the conveyor belt 62a. At this time, since the length of the spray nozzle in the direction along the X-axis is longer than the length of the web W, the compressed air sprayed from the spray nozzle is sprayed across the entire width of the web W.

[0046] As a result, the web W is peeled off from the conveyor belt 62a. The air injection unit 200 injects compressed air when the downstream leading edge of the web W reaches the area facing the air injection unit 200. Then, after the leading edge of the web W is peeled off from the conveyor belt 62a, the leading edge of the web W is bent and folded. Thereafter, the web W is transferred from the second conveyor unit 62 to the pressurizing unit 70.

[0047] The pressure unit 70 has a pressure roller pair 700 consisting of a first roller 71 and a second roller 72. The pressure unit 70 passes the web W between the pressure roller pair 700 to form a belt-shaped sheet P1 from the web W.

[0048] The first roller 71 and the second roller 72 form a pair and are each a substantially cylindrical member. The rotation axis of the first roller 71 and the rotation axis of the second roller 72 are arranged along the X axis. With respect to the transport path of the web W, the first roller 71 is arranged substantially below and the second roller 72 is arranged substantially above. The first roller 71 and the second roller 72 rotate close to each other while the strip-shaped sheet P1 is formed from the web W.

[0049] In the direction along the X-axis, the length of the first roller 71 and the length of the second roller 72 are longer than the length of the web W, i.e., the width of the web W. Therefore, the web W is firmly sandwiched between the first roller 71 and the second roller 72.

[0050] The web W is pressed by passing between the first roller 71 and the second roller 72. The first roller 71 has a built-in electric heater and is provided with a function of increasing the temperature of the roller surface. It is preferable that the second roller 72 also has a function of increasing the temperature of the roller surface by an electric heater, similar to the first roller 71.

[0051] The first roller 71 is rotated by a stepping motor (not shown). The second roller 72 is not driven by a motor, but is a driven roller that rotates in conjunction with the rotation of the first roller 71. Therefore, the second roller 72 rotates in the opposite direction to the first roller 71 when viewed from the side in the -X direction.

[0052] The web W is sandwiched between the first roller 71 and the second roller 72 and sent downstream while being heated and pressurized. That is, the web W is continuously passed through the pressurizing section 70 and press-formed while being heated. By using the first roller 71 and the second roller 72 as a pair of forming members, the web W is efficiently heated and pressurized.

[0053] As the web W passes through the pressurizing unit 70, the air contained therein is reduced and the density of the web W increases from a soft state containing a relatively large amount of air. Then, the fibers are bound together by the binder, and the web W is formed into a belt-shaped sheet P1. The belt-shaped sheet P1 is transported to the first unit group 101 by transport rollers (not shown).

[0054] Here, since the web W is formed by depositing the mixture, the thickness of the web W is unstable in the initial stage of the formation of the web W, i.e., in the region of the leading end of the web W. In general, the thickness of the leading end of the web W tends to be thinner than the thickness of the rear portion.

[0055] The second humidifying section 66 is disposed below the first humidifying section 65. As the second humidifying section 66, a known evaporation type humidifying device can be applied.

[0056] The second humidifying section 66 humidifies a predetermined area of ​​the sheet manufacturing apparatus 1. The predetermined area is one or more of the buffer tank 13, the separating section 40, and the inside of the drum member 53 of the stacking section 50. Specifically, humidified air is supplied to the above-mentioned area from the second humidifying section 66 via multiple pipes (not shown). In each of the above-mentioned configurations, the humidified air suppresses the electrostatic charge of the waste paper C, fibers, etc., and prevents them from adhering to the members due to static electricity.

[0057] The drainage unit 68 is a drainage tank. The drainage unit 68 is used in the first humidifying unit 65, the second humidifying unit 66, etc., and collects and stores old water. The drainage unit 68 can be removed from the sheet manufacturing apparatus 1 as needed, allowing the accumulated water to be discarded.

[0058] The strip-shaped sheet P1 transported to the first unit group 101 reaches the first cutting section 81. The first cutting section 81 cuts the strip-shaped sheet P1 in a direction intersecting the transport direction, for example, in a direction along the X-axis. The strip-shaped sheet P1 is cut into single sheets P2 at the first cutting section 81. The single sheets P2 are transported from the first cutting section 81 to the second cutting section 82.

[0059] The second cutting section 82 cuts the single sheet P2 in the conveyance direction, for example, along the Y axis. More specifically, the second cutting section 82 cuts both ends of the single sheet P2 in the X axis direction. This cuts the single sheet P2 into sheets P3 of a predetermined shape, such as A4 size or A3 size.

[0060] When the second cutting section 82 cuts the single sheets P2 into sheets P3, slit pieces S, which are scraps, are generated. The slit pieces S are transported in the approximately -Y direction to the shredding section 86, which is a shredder. The shredding section 86 shreds the slit pieces S into small pieces and supplies them to the junction 17. A mechanism may be installed between the shredding section 86 and the junction 17 to weigh the small pieces of the slit pieces S and supply them to the junction 17.

[0061] The sheet P3 is conveyed substantially upward and accumulated on the tray 84. In this manner, the sheet P3 is manufactured by the sheet manufacturing apparatus 1. The sheet P3 can be used as a substitute for, for example, copy paper.

[0062] Next, the configuration around the second transport section 62 will be described with reference to FIG.

[0063] 2, the second conveying section 62 has a conveying belt 62a, a plurality of rollers 63, and a second suction section 62b. The conveying belt 62a is stretched by the plurality of rollers 63 and is configured to allow air to pass through.

[0064] The conveyor belt 62a is configured to be rotatable by the rotation of the rollers 63. The second suction section 62b is disposed in a position facing the web W with the conveyor belt 62a in between. The second suction section 62b is equipped with an intake fan 64, and generates an upward airflow on the conveyor belt 62a by the suction force of the intake fan 64. The web W is sucked by this airflow.

[0065] Specifically, the second suction section 62b has a plurality of suction ports 69 for sucking in air. The second suction section 62b has a suction duct 73 connected to the suction ports 69. Air is sucked through the suction duct 73 by driving the intake fan 64.

[0066] As a result, the web W is peeled off from the deposition belt 61a, and one side Wa, which is the upper surface of the web W peeled off from the deposition belt 61a, can be brought into contact with the conveyor belt 62a. Then, one side Wa of the web W contacts the conveyor belt 62a, and the web W is conveyed in a held state.

[0067] A first humidifying section 65 is disposed below the second conveying section 62. The first humidifying section 65 is disposed so as to face the conveyor belt 62a. The first humidifying section 65 applies moisture to the other surface Wb, which is the lower surface of the web W in contact with the conveyor belt 62a. The first humidifying section 65 applies humidified air (for example, water vapor or mist) to the web W as moisture.

[0068] The first humidifying section 65 includes a container 65a capable of storing water and a piezoelectric vibrator 65b disposed at the bottom of the container 65a. An outlet 65c for discharging humidified air is formed at the top of the container 65a. The container 65a is disposed so that the outlet 65c faces the other surface Wb of the web W.

[0069] By driving the piezoelectric vibrator 65b, ultrasonic waves are generated in the water, generating mist (humidified air) inside the container 65a. The generated mist is supplied to the web W through the outlet 65c of the container 65a. By adding moisture from below the web W, even if condensation occurs in or near the first humidifying section 65, water droplets will not fall onto the web W.

[0070] A cam rotation mechanism 300 (see FIG. 3) is disposed on the upstream side of the second conveying section 62. The cam rotation mechanism 300 rotates an eccentric cam 330, thereby enabling the upstream side of the second conveying section 62 to rise and fall.

[0071] Next, the configuration of the cam rotation mechanism 300 will be described with reference to FIGS.

[0072] As described above, the cam rotation mechanism 300 is configured to be able to move the entire second transport section 62 in the up and down direction by rotating the eccentric cam 330. In other words, the cam rotation mechanism 300 is able to change the position of the second frame 500 including the second transport section 62 relative to the first frame 400 including the first transport section 61.

[0073] The first frame 400 is provided with a deposition belt 61a and a first suction unit 59. The second frame 500 is provided with a transport belt 62a and a second suction unit 62b.

[0074] As shown in FIG. 3, the cam rotation mechanism 300 includes a drive motor 310 , a power transmission unit 320 connected to the drive motor 310 , and an eccentric cam 330 .

[0075] 3 and 6, the power transmission unit 320 includes a first power transmission unit 321 connected to the drive motor 310, a second power transmission unit 322 connected to the first power transmission unit 321 via a gear, and a third power transmission unit 323 connected to the second power transmission unit 322 via a gear. A fourth power transmission unit 324 may be provided between the third power transmission unit 323 and the eccentric cam 330 (see FIG. 6).

[0076] The eccentric cam 330 is provided between the first frame 400 and the second frame 500. In this embodiment, the cam rotation mechanism 300 including the eccentric cam 330 is attached to the second frame 500. Therefore, the position of the second frame 500 changes relative to the first frame 400 in accordance with the rotation of the eccentric cam 330. In other words, the rotation of the eccentric cam 330 does not change the position of the first frame 400, but moves the position of the second frame 500 in the vertical direction.

[0077] 4, eccentric cam 330 has a first protrusion 331 that protrudes from rotation axis 330a as the center, a second protrusion 332 that is disposed at a position shifted 90° clockwise from first protrusion 331, a third protrusion 333 that is disposed at a position shifted 90° clockwise from second protrusion 332, and a fourth protrusion 334 that is disposed at a position shifted 90° clockwise from third protrusion 333. Eccentric cam 330 rotates, for example, by contacting installation surface 400a of first frame 400.

[0078] As shown in FIGS. 5A to 5E, the eccentric cam 330 rotates, for example, counterclockwise at intervals of 90° as the drive motor 310 rotates.

[0079] As shown in FIG. 5A, when the first protrusion 331 of the eccentric cam 330 abuts against the mounting surface 400a of the first frame 400, the second frame 500 rises (lifts up) to a second position above the gap L2 from the first position, assuming that the reference position is the first position (see FIG. 7).

[0080] As shown in Figure 5B, when the second protrusion 332 of the eccentric cam 330 abuts against the mounting surface 400a of the first frame 400, the second frame 500 descends (lifts down) from the second position to the first position, which is the reference position (see Figure 8).

[0081] As shown in FIG. 5C, when the third protrusion 333 of the eccentric cam 330 abuts against the mounting surface 400a of the first frame 400, the second frame 500 rises again to the second position above the gap L2 from the first position.

[0082] As shown in FIG. 5D, when the fourth protrusion 334 of the eccentric cam 330 abuts against the installation surface 400a of the first frame 400, the second frame 500 descends again from the second position to the first position (see FIG. 8).

[0083] As shown in Figure 5E, when the first protrusion 331 of the eccentric cam 330 abuts against the mounting surface 400a of the first frame 400 again, the second frame 500 rises again to a second position above the gap L2 from the first position and returns to the reference position.

[0084] In other words, if the gap between the deposition belt 61a and the conveying belt 62a when the second frame 500 is in the first position is L1, and the gap between the deposition belt 61a and the conveying belt 62a when the second frame 500 is in the second position is L2, then the relationship L2>L1 holds (see Figures 7 and 8).

[0085] 9, the cam rotation mechanism 300 has a detection unit 340 that detects the home position of the eccentric cam 330. The eccentric cam 330 is provided with a protrusion 335 at a part of the direction intersecting with the direction in which the first to fourth protrusions 331 to 334 protrude.

[0086] The detector 340 is, for example, a photocoupler. The detector 340 has a light emitting element 341 and a light receiving element 342. The light emitting element 341 is, for example, an LED. The light receiving element 342 is, for example, a phototransistor.

[0087] For example, the detection unit 340 detects that the position of the eccentric cam 330 is not at the home position while the light receiving element 342 receives the light 343 from the light emitting element 341. For example, the detection unit 340 detects that the position of the eccentric cam 330 is at the home position when the light receiving element 342 cannot receive the light 343 from the light emitting element 341, specifically when the protrusion 335 of the eccentric cam 330 is positioned between the light emitting element 341 and the light receiving element 342.

[0088] In this way, since the detector 340 is disposed around the eccentric cam 330, it is possible to determine whether or not the eccentric cam 330 is at the home position based on the rotational position of the eccentric cam 330. This makes it possible to prevent malfunction of the cam rotation mechanism 300.

[0089] Next, the operation of the cam rotation mechanism 300 and the operation of the second frame 500 will be described with reference to FIGS. 10A to 13B.

[0090] 10A and 10B, the leading edge of the web W is sucked up by the second suction portion 62b. Specifically, the cam rotation mechanism 300 is operated to rotate the eccentric cam 330 counterclockwise, and the second protrusion 332 of the eccentric cam 330 is brought into contact with the installation surface 400a of the first frame 400. As a result, the position of the second frame 500 is lowered from the second position, which was the home position, to the first position around the rotation shaft 510. In other words, the gap between the first frame 400 and the second frame 500 is narrowed.

[0091] In this way, by setting the position of the second frame 500 to the first position, it is possible to shorten the distance between the deposition belt 61a of the first frame 400 and the conveying belt 62a of the second frame 500, making it easier to suck up the thin part at the tip of the web W upward by the second suction section 62b.

[0092] 11A and 11B, the web W is prevented from contacting the edge 65d of the first humidifying section 65. Specifically, the cam rotation mechanism 300 is operated to rotate the eccentric cam 330 counterclockwise, causing the third protrusion 333 of the eccentric cam 330 to contact the installation surface 400a of the first frame 400. As a result, the position of the second frame 500 rises from the first position to the second position around the rotation shaft 510. In other words, the gap between the first frame 400 and the second frame 500 widens.

[0093] In this way, by setting the position of the second frame 500 to the second position, it is possible to increase the distance between the deposition belt 61a of the first frame 400 and the conveyor belt 62a of the second frame 500. Therefore, when the web W passes through the first humidifying section 65, it is possible to prevent the thick portion of the web W from hitting the edge 65d of the first humidifying section 65.

[0094] 12A and 12B, the efficiency of humidifying the web W is improved. Specifically, the cam rotation mechanism 300 is operated to rotate the eccentric cam 330 counterclockwise, and the fourth protrusion 334 of the eccentric cam 330 is brought into contact with the installation surface 400a of the first frame 400. As a result, the position of the second frame 500 is lowered from the second position to the first position around the rotation shaft 510. In other words, the gap between the first frame 400 and the second frame 500 is narrowed.

[0095] In this way, when the leading edge of the web W passes through the first humidifying section 65 and the thickness of the web W becomes normal, the position of the second frame 500 is set to the first position, which makes it possible to shorten the distance between the deposition belt 61a of the first frame 400 and the conveying belt 62a of the second frame 500, thereby improving the efficiency of humidifying the web W.

[0096] 13A and 13B, the rear end of the web W is torn off. Specifically, the cam rotation mechanism 300 is operated to rotate the eccentric cam 330 counterclockwise, and the first protrusion 331 of the eccentric cam 330 is brought into contact with the installation surface 400a of the first frame 400. As a result, the position of the second frame 500 rises from the first position to the second position around the rotation shaft 510. In other words, the gap between the first frame 400 and the second frame 500 widens.

[0097] In this way, by setting the position of the second frame 500 to the second position, which is the home position, it is possible to increase the distance between the deposition belt 61a of the first frame 400 and the conveyor belt 62a of the second frame 500, and when tearing off the rear end of the web W, it is possible to prevent, for example, the conveyor belt 62a from rubbing against the web W and causing paper powder to become tangled. This makes it possible to prevent the tangled paper powder from clogging the conveyance path.

[0098] As described above, the sheet manufacturing apparatus 1 of this embodiment is a sheet manufacturing apparatus 1 that manufactures a sheet from a material containing fiber, and includes the deposition unit 50 that deposits the material by an airflow to form the web W, the second conveying unit 62 that conveys the web W, and the pressurizing unit 70 that pressurizes the web W to form a sheet. The deposition unit 50 includes a drum member 53 that agitates the material, a deposition belt 61a on which the material discharged from the drum member 53 is deposited, and a first suction unit 59 that is provided on the opposite side of the deposition belt 61a from the drum member 53 and performs suction so that the material is deposited on the deposition belt 61a. The second conveying section 62 comprises a conveying belt 62a that contacts one side of the web W to hold the web W, a second suction section 62b that is provided above the conveying belt 62a and performs suction to adsorb the web W, and a second frame 500 that is provided with the conveying belt 62a and the second suction section 62b. An eccentric cam 330 is provided between the first frame 400 and the second frame 500, and the position of the second frame 500 relative to the first frame 400 is changed as the eccentric cam 330 rotates.

[0099] According to this configuration, the position of the second frame 500 is changed by the rotation of the eccentric cam 330, so the gap between the first frame 400 and the second frame 500 can be changed depending on the situation of the web W passing through. Specifically, for example, when the leading edge of the web W is to be attracted to the conveyor belt 62a, the gap between the first frame 400 and the second frame 500 can be narrowed, and when the web W is to be torn off, the gap between the first frame 400 and the second frame 500 can be widened.

[0100] Furthermore, the sheet manufacturing apparatus 1 of the present embodiment preferably includes a drive motor 310 that rotates the eccentric cam 330. According to this configuration, since the drive motor 310 is provided, it becomes possible to rotate the eccentric cam 330 according to the position through which the web W passes, and it is possible to adjust the gap between the first frame 400 and the second frame 500 to an appropriate gap.

[0101] Furthermore, in the sheet manufacturing apparatus 1 of this embodiment, it is preferable that the rotation of the eccentric cam 330 causes the second frame 500 to rise from a state in which the second frame 500 is at a first position relative to the first frame 400 to a second position that is higher than the first position. According to this configuration, the rotation of the eccentric cam 330 causes the position of the second frame 500 to rise from the first position to the second position, so that an appropriate gap can be created when, for example, tearing the web W.

[0102] Furthermore, in the sheet manufacturing apparatus 1 of the present embodiment, it is preferable that the second frame 500 descends to the first position when the eccentric cam 330 rotates from a state in which the second frame 500 is in the second position. According to this configuration, the position of the second frame 500 descends from the second position to the first position, so that an appropriate gap can be set when, for example, the leading end of the web W is sucked onto the conveyor belt 62a or the web W is humidified.

[0103] Furthermore, in the sheet manufacturing apparatus 1 of this embodiment, when the gap between the deposition belt 61a and the conveying belt 62a at the first position is L1 and the gap between the deposition belt 61a and the conveying belt 62a at the second position is L2, it is preferable that the relationship be L2 > L1. According to this configuration, the relationship of the gap between the deposition belt 61a and the conveying belt 62a is as described above, so that the gaps L1 and L2 can be adjusted by the rotation of the eccentric cam 330 in accordance with the timing at which the web W passes.

[0104] Furthermore, in the sheet manufacturing apparatus 1 of this embodiment, the eccentric cam 330 is provided with a protrusion 335, and a detection unit 340 is preferably disposed near the protrusion 335 to determine the presence or absence of the protrusion 335 and detect the home position of the eccentric cam 330. With this configuration, since the detection unit 340 is disposed, it is possible to determine whether or not the eccentric cam 330 is at the home position based on the rotational position of the eccentric cam 330. Therefore, malfunction of the eccentric cam 330 can be suppressed.

[0105] Furthermore, the sheet manufacturing apparatus 1 of the present embodiment preferably includes a first humidifying section 65 that is disposed opposite the conveyor belt 62a and that applies moisture to the other side of the web W. According to this configuration, even when the first humidifying section 65 is provided, by adjusting the gap between the first frame 400 and the second frame 500 to an appropriate gap, for example, the second position, when the web W passes through the first humidifying section 65, the web W can be prevented from contacting the first humidifying section 65, and the web W can be transported downstream.

[0106] Furthermore, in the sheet manufacturing apparatus 1 of the present embodiment, it is preferable that the second frame 500 is in the first position when the leading edge of the web W is attracted to the conveyor belt 62a. According to this configuration, since the second frame 500 is in the first position, in other words, the gap between the first frame 400 and the second frame 500 is narrow, even when the leading edge of the web W is thin, the web W can be attracted to the conveyor belt 62a relatively smoothly.

[0107] Furthermore, in the sheet manufacturing apparatus 1 of this embodiment, after the web W is adsorbed to the conveyor belt 62a, it is preferable to rotate the eccentric cam 330 to raise the second frame 500 from the first position to the second position before the leading edge of the web W passes above the first humidifying section 65. According to this configuration, the web W is raised to the second position, in other words, the gap between the first frame 400 and the second frame 500 is widened, so that it is possible to prevent the web W from contacting the first humidifying section 65 and prevent the web W from becoming clogged between the first humidifying section 65 and the conveyor belt 62a.

[0108] Furthermore, in the sheet manufacturing apparatus 1 of this embodiment, it is preferable to rotate the eccentric cam 330 to lower the second frame 500 from the second position to the first position after the leading edge of the web W passes above the first humidifying section 65. According to this configuration, the web W is lowered to the first position, in other words, the gap between the first frame 400 and the second frame 500 is narrowed, so that the first humidifying section 65 can efficiently humidify the web W.

[0109] Furthermore, in the sheet manufacturing apparatus 1 of this embodiment, when tearing the web W, it is preferable to rotate the eccentric cam 330 to raise the second frame 500 from the first position to the second position. According to this configuration, the web W is raised to the second position, in other words, the gap between the first frame 400 and the second frame 500 is widened. This makes it possible to prevent excessive contact with the conveyor belt 62a when tearing the web W, and allows the web W to be torn at a desired position. Furthermore, excessive contact with the conveyor belt 62a can prevent the web W from becoming twisted and becoming jammed between the first frame 400 and the second frame 500.

[0110] A modification of the above embodiment will now be described.

[0111] As described above, the eccentric cam 330 is not limited to being provided on the second frame 500, but may be provided on the first frame 400.

[0112] As described above, the eccentric cam 330 is not limited to rotating counterclockwise, and may be rotated clockwise. Furthermore, the number of eccentric cams 330 is not limited to one, and as long as the second frame 500 moves up and down around the rotation shaft 510, two eccentric cams 330 may be arranged in the X direction, or multiple eccentric cams may be arranged in the -Y direction. Furthermore, in addition to the rotation of the eccentric cam 330, another mechanism may be added to move the second frame 500 up and down. Examples of other mechanisms include a rack and pinion, a ball screw, etc. [Explanation of symbols]

[0113] 1...sheet manufacturing apparatus, 5...control section, 11...raw material inlet, 13...buffer tank, 15...quantitative supply section, 15a...measuring device, 17...junction section, 21, 23, 24, 25...piping, 29...air flow piping, 30...fibing section, 40...separation section, 50...accumulation section, 51...housing, 53...drum member, 55...blade member, 59...first suction section, 61...first conveying section, 61a...accumulation belt, 62...conveying section a second conveying section as a humidifying section, 62a...conveyor belt, 62b...second suction section, 63...roller, 64...intake fan, 65...first humidifying section as a humidifying section, 65a...container, 65b...piezoelectric vibrator, 65d...edge, 65c...exhaust port, 66...second humidifying section, 67...water supply section, 68...drain section, 69...suction port, 70...pressurizing section, 71...first roller, 72...second roller, 73...suction duct, 81...first Cutting section, 82...second cutting section, 84...tray, 86...shredding section, 91...mixing section, 95...recovery section, 97...compressor, 99...power supply section, 101...first unit group, 102...second unit group, 103...third unit group, 200...air injection section, 300...cam rotation mechanism, 310...drive motor, 320...power transmission section, 321...first power transmission section, 322...second power transmission section, 323... Third power transmission part, 324...fourth power transmission part, 330...eccentric cam, 330a...rotating shaft, 331...first convex part, 332...second convex part, 333...third convex part, 334...fourth convex part, 335...protrusion, 340...detecting part, 341...light-emitting element, 342...light-receiving element, 343...light, 400...first frame, 400a...installation surface, 500...second frame, 510...rotating shaft, 700...pair of pressure rollers.

Claims

1. A sheet manufacturing apparatus for manufacturing a sheet from a material containing fiber, a deposition section for depositing the material by an airflow to form a web; a conveying section that conveys the web; a pressurizing unit that pressurizes the web to form the sheet; Equipped with The deposition section is a drum member for agitating the material; a deposition belt on which the material discharged from the drum member is deposited; a first suction unit that is provided on the opposite side of the deposition belt from the drum member and that performs suction so that the material is deposited on the deposition belt; a first frame on which the deposition belt and the first suction unit are installed; Equipped with The conveying unit is a conveyor belt that contacts one side of the web to hold the web; a second suction section provided above the conveyor belt and configured to perform suction to attract the web; a second frame on which the conveyor belt and the second suction unit are installed; Equipped with an eccentric cam is provided between the first frame and the second frame; The sheet manufacturing apparatus, wherein the position of the second frame relative to the first frame is changed in response to rotation of the eccentric cam.

2. The sheet manufacturing apparatus according to claim 1, a drive motor for rotating the eccentric cam;

3. The sheet manufacturing apparatus according to claim 1, The sheet manufacturing apparatus, wherein the second frame is in a first position relative to the first frame, and the eccentric cam rotates, causing the second frame to rise to a second position higher than the first position.

4. The sheet manufacturing apparatus according to claim 3, The sheet manufacturing apparatus, wherein the second frame is lowered to the first position when the eccentric cam rotates from a state in which the second frame is at the second position.

5. The sheet manufacturing apparatus according to claim 3, A sheet manufacturing apparatus, wherein when the gap between the deposition belt and the conveying belt at the first position is L1 and the gap between the deposition belt and the conveying belt at the second position is L2, the relationship L2 > L1 holds.

6. The sheet manufacturing apparatus according to claim 1, The eccentric cam is provided with a protrusion, A detection unit is disposed near the protrusion to determine the presence or absence of the protrusion and detect a home position of the eccentric cam.

7. The sheet manufacturing apparatus according to claim 1, The sheet manufacturing apparatus further comprises a humidifying unit disposed opposite the conveyor belt and configured to apply moisture to the other side of the web.

8. The sheet manufacturing apparatus according to claim 3, When the leading edge of the web is attracted to the conveyor belt, the second frame is at the first position.

9. The sheet manufacturing apparatus according to claim 7, a sheet manufacturing apparatus, wherein after the web is adsorbed to the conveying belt and before the leading edge of the web passes above the humidifying section, the eccentric cam is rotated to raise the second frame from the first position to the second position.

10. The sheet manufacturing apparatus according to claim 7, After the leading edge of the web passes above the humidifying section, the eccentric cam is rotated to lower the second frame from the second position to the first position.

11. The sheet manufacturing apparatus according to claim 3, The sheet manufacturing apparatus rotates the eccentric cam to raise the second frame from the first position to the second position when the web is torn off.

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