JP6464758B2 - Sheet manufacturing equipment - Google Patents

Description

  The present invention relates to a sheet manufacturing apparatus.

  2. Description of the Related Art Conventionally, a paper recycling apparatus that pulverizes and defibrates waste paper and forms the paper with the defibrated material (see, for example, Patent Document 1).

JP 2012-144819 A

  By the way, when a sheet (web) is conveyed in the sheet manufacturing process, if a tension mechanism or the like is arranged in the conveyance path, the leading end of the conveyed sheet comes into contact with the tension mechanism, which causes a conveyance failure such as a jam. There was a problem that it would occur.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A sheet manufacturing apparatus according to this application example includes a defibrating unit for defibrating a raw material containing fibers, and a deposition unit for depositing at least a part of the defibrated material defibrated by the defibrating unit. , A transport unit that transports deposits deposited in the stacking unit, wherein the transport unit is provided on the downstream side of the first transport roller pair and the first transport roller pair A guide unit that is provided between the second transport roller pair, the first transport roller pair, and the second transport roller pair, and guides the tip of the deposit toward the second transport roller pair; , Provided between the guide portion disposed vertically below the sandwiching portion of the first transport roller pair, the first transport roller pair, and the second transport roller pair, and biases the deposit. A tension mechanism, wherein the tip of the deposit is After being held between the second conveying roller pair, characterized in that it comprises a and a tension mechanism that applies tension to the deposit.

  According to this structure, the front-end | tip part of the deposit conveyed from the 1st conveyance roller pair is guided to the 2nd conveyance roller pair by the guide part, and is clamped by the 2nd conveyance roller pair. Here, since the tension mechanism does not operate until the tip of the deposit is sandwiched between the second transport roller pair, the movement of the tip of the deposit is not hindered. Thereby, the conveyance failure of a deposit is reduced and a deposit can be easily passed through a 2nd conveyance roller pair.

  Application Example 2 The sheet manufacturing apparatus according to the application example is provided on the downstream side in the conveyance direction of the second conveyance roller pair, and includes a deposit detection unit that detects the presence or absence of the deposit, and the deposit detection unit. A switching unit that switches the tension mechanism from a retracted position to a tension applying position when it is detected that the deposit is present.

  According to this structure, after the front-end | tip part of a deposit passes a 2nd conveyance roller pair, switching from the retracting position of a tension mechanism to a tension | tensile_strength provision position is performed. As a result, the tension mechanism does not operate until the tip of the deposit is sandwiched between the second conveyance roller pair, so that it is possible to reduce the deposit conveyance failure.

  Application Example 3 In the sheet manufacturing apparatus according to the application example described above, the first conveying roller pair includes an imaginary line connecting the rotation center axis of the driving roller and the rotation center axis of the driven roller inclined toward the downstream side in the conveyance direction. It is arrange | positioned so that it may carry out.

  According to this configuration, the tip end portion of the deposit is transported toward the guide portion side by arranging the first transport roller pair at an inclination, and the tip end portion of the deposit can be reliably guided to the guide portion.

  Application Example 4 In the sheet manufacturing apparatus according to the application example described above, in the first transport roller pair, the lower roller in the vertical direction is harder than the upper roller in the vertical direction.

  According to this configuration, the deposit (web) that has passed through the first conveyance roller pair can be bent and conveyed in the direction toward the guide portion.

  Application Example 5 In the sheet manufacturing apparatus according to the application example, at least a peripheral speed of the driving roller of the second conveyance roller pair is a predetermined period after the tip of the deposit is sandwiched between the second conveyance roller pair. Is characterized by being faster than the peripheral speed of the drive roller of the first conveying roller pair.

  According to this configuration, it is possible to remove slack from the transported deposit and to perform stable transport without undulation.

  Application Example 6 In the sheet manufacturing apparatus according to the application example, after the tension is applied to the deposit by the tension mechanism, the peripheral speed of the driving roller of the second transport roller pair is set to the value of the first transport roller pair. It is characterized in that the switching operation is made slower and faster than the peripheral speed of the driving roller.

  According to this configuration, it is possible to remove slack from the transported deposit and to perform stable transport without undulation.

  Application Example 7 In the sheet manufacturing apparatus according to the application example, the slack detection unit detects slackness of the deposit between the first transport roller pair and the second transport roller pair, and the deposit A slack detecting unit capable of detecting that the slack amount is a first value and a second value larger than the first value, and the slack detecting unit determines that the slack amount is a first value. When it is detected that the value is a value, the peripheral speed of the driving roller of the second transport roller pair is made slower than the peripheral speed of the drive roller of the first transport roller pair, and the slackness detecting unit When a value of 2 is detected, the peripheral speed of the driving roller of the second transport roller pair is made faster than the peripheral speed of the drive roller of the first transport roller pair.

  According to this configuration, it is possible to grasp the slack state of the deposit between the first transport roller pair and the second transport roller pair, and to easily suppress the slack or undulation of the deposit.

Schematic which shows the structure of a sheet manufacturing apparatus. Schematic which shows the structure of a 1st conveyance roller pair. Schematic which shows the structure of a conveyance part. The operation | movement figure of the conveyance part which shows the control method of a sheet manufacturing apparatus. The operation | movement figure of the conveyance part which shows the control method of a sheet manufacturing apparatus. The operation | movement figure of the conveyance part which shows the control method of a sheet manufacturing apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each member or the like is shown differently from the actual scale so as to make each member or the like recognizable.

  First, the configuration of the sheet manufacturing apparatus will be described. The sheet manufacturing apparatus is based on a technology for forming a raw material (defibrated material) Pu such as a pure pulp sheet or used paper on a new sheet Pr, for example. The sheet manufacturing apparatus according to the present embodiment includes a defibrating unit that defibrates a raw material containing fibers, a depositing unit that deposits at least a part of the defibrated material, a conveying unit that conveys the deposit accumulated in the depositing unit, It is what has. Hereinafter, the configuration of the sheet manufacturing apparatus will be specifically described.

  FIG. 1 is a schematic diagram illustrating a configuration of a sheet manufacturing apparatus according to the present embodiment. As shown in FIG. 1, the sheet manufacturing apparatus 1 of the present embodiment includes a supply unit 10, a crushing unit 20, a defibrating unit 30, a classification unit 40, a sorting unit 50, and an additive charging unit 60. , A deposition unit 70, a transport unit 100, a cutting unit 130, and the like. Moreover, the control part 2 which controls these members is provided.

  The supply unit 10 supplies waste paper Pu or the like as a raw material to the crushing unit 20. The supply unit 10 includes, for example, a tray 11 that accumulates and stores a plurality of used paper Pu, and an automatic feeding mechanism 12 that can continuously input the used paper Pu in the tray 11 to the crushing unit 20. The used paper Pu supplied to the sheet manufacturing apparatus 1 is, for example, A4 size paper that is currently mainstream in offices.

  The crushing unit 20 cuts the supplied used paper Pu into pieces of several centimeters square. The crushing unit 20 includes a crushing blade 21 and constitutes an apparatus in which the cutting width of a normal shredder blade is widened. Thereby, the supplied used paper Pu can be easily cut into pieces of paper. Then, the divided coarsely crushed paper is supplied to the defibrating unit 30 via the pipe 201.

  The defibrating unit 30 defibrates a material (raw material) containing fibers in the air. Specifically, the defibrating unit 30 includes a rotating blade (not shown) that rotates, and performs defibrating to loosen the crushed paper supplied from the crushing unit 20 into fibers. In this application, what is defibrated by the defibrating unit 30 is called a defibrated material, and what has passed through the defibrating unit 30 is called a defibrated material. In addition, the defibrating unit 30 of the present embodiment performs defibrating in a dry manner in the air. As a result of the defibrating process of the defibrating unit 30, the printed ink, toner, and the material applied to the paper such as the anti-bleeding material become fibers of several tens of μm or less (hereinafter referred to as “ink particles”). And separate. Therefore, the defibrated material that comes out from the defibrating unit 30 is fibers and ink particles obtained by defibrating a piece of paper. The airflow is generated by the rotation of the rotary blade, and the fibers defibrated via the pipe 202 are carried on the airflow and conveyed to the classification unit 40 in the air. In addition, you may provide separately the airflow generator which produces | generates the airflow for conveying the fiber disentangled in the defibrating part 30 via the piping 202 to the classification part 40 as needed.

  The classifying unit 40 classifies the introduced material by airflow. In this embodiment, the defibrated material as the introduced material is classified into ink particles and fibers. The classifying unit 40 can classify the conveyed defibrated material into ink particles and fibers by applying a cyclone, for example. Note that other types of airflow classifiers may be used instead of the cyclone. In this case, as an airflow classifier other than the cyclone, for example, an elbow jet or an eddy classifier is used. The airflow classifier generates a swirling airflow, which is separated and classified by the difference in centrifugal force received depending on the size and density of the defibrated material, and the classification point can be adjusted by adjusting the speed and centrifugal force of the airflow. . As a result, the ink particles can be divided into relatively small and low density ink particles and fibers larger than the ink particles and high density.

  The classifying unit 40 of the present embodiment is a tangential input type cyclone, and includes an introduction port 40a through which an introduced material is introduced from the defibrating unit 30, a cylinder unit 41 in which the introduction port 40a is tangentially arranged, The conical part 42 that follows, the lower outlet 40b provided at the lower part of the conical part 42, and the upper exhaust port 40c for discharging fine powder provided at the upper center of the cylindrical part 41 are configured. The diameter of the conical portion 42 decreases toward the lower side in the vertical direction.

  In the classification process, the airflow on which the defibrated material introduced from the introduction port 40a of the classification unit 40 is changed into a circumferential motion by the cylindrical part 41 and the conical part 42, and is subjected to centrifugal force and classified. Then, the fibers larger than the ink particles and having a high density move to the lower outlet 40b, and the relatively small and low density ink particles are led to the upper exhaust port 40c as fine powder together with air. Then, ink particles are discharged from the upper exhaust port 40 c of the classification unit 40. Then, the discharged ink particles are collected in the receiving unit 80 via the pipe 206 connected to the upper exhaust port 40c of the classifying unit 40. On the other hand, a classified product containing fibers classified through the pipe 203 from the lower outlet 40b of the classifying unit 40 is conveyed toward the sorting unit 50 in the air. From the classification unit 40 to the sorting unit 50, it may be transported by an air current when it is classified, or may be transported from the classification unit 40 located above to the sorting unit 50 located below by gravity. Note that a suction part or the like for efficiently sucking the short fiber mixture from the upper exhaust port 40c may be disposed in the upper exhaust port 40c, the pipe 206, or the like of the classification unit 40. Classification is not exactly divided at a certain size or density. Further, it is not exactly divided into fibers and ink particles. Among the fibers, relatively short fibers are discharged from the upper exhaust port 40c together with the ink particles. A relatively large ink particle is discharged from the lower outlet 40b together with the fiber.

  The sorting unit 50 sorts the classified product (defibrated material) including the fibers classified by the classifying unit 40 through the sieve unit 51 having a plurality of openings. More specifically, the classified product including the fibers classified by the classifying unit 40 is sorted into a passing material that passes through the opening and a residue that does not pass through the opening. The sorting unit 50 according to the present embodiment includes a mechanism for dispersing the classified material in the air by rotational movement. Then, the passing material that has passed through the opening by sorting by the sorting unit 50 is transported from the passing material transport unit 52 to the deposition unit 70 side via the pipe 204. On the other hand, the residue that has not passed through the opening due to the sorting by the sorting unit 50 is returned to the defibrating unit 30 again as the defibrated material via the pipe 205. Thereby, the residue is reused (reused) without being discarded.

  The passing material that has passed through the opening by sorting by the sorting unit 50 is conveyed in the air to the deposition unit 70 via the pipe 204. The sorting unit 50 may be transported from the sorting unit 50 to the deposition unit 70 by a blower (not shown) that generates an air flow, or may be transported by gravity from the sorting unit 50 located above to the deposition unit 70 located below. Between the sorting unit 50 and the deposition unit 70 in the pipe 204, an additive feeding unit for adding an additive such as a binder resin (for example, a thermoplastic resin or a thermosetting resin) to the passing material to be conveyed. 60 is provided. In addition to the binder resin, for example, a flame retardant, a whiteness improver, a sheet strength enhancer, a sizing agent, an absorption modifier, a fragrance, a deodorizer, and the like can be added as the additive. These additives are stored in the additive storage unit 61 and are charged from the charging port 62 by a charging mechanism (not shown).

  The depositing unit 70 allows a material containing fibers to be deposited, and deposits at least a part of the defibrated material defibrated by the defibrating unit 30 in the air. Specifically, the depositing unit 70 forms a web W by depositing using a material containing fibers and binder resin introduced from the pipe 204, and has a mechanism for uniformly dispersing the fibers in the air. I have. Further, the depositing unit 70 has a moving unit that deposits the defibrated material as a deposit (web W) while moving. The moving unit of the present embodiment includes a tension roller 72 and an endless mesh belt 73 on which a mesh stretched by the tension roller 72 is formed. The mesh belt 73 rotates (moves) in one direction when at least one of the stretching rollers 72 rotates. In addition, the web W concerning this embodiment says the structure form of the object containing a fiber and binder resin. Therefore, even when the shape or the like changes during heating, pressurizing, cutting, or conveying the web, the web is shown.

  First, as a mechanism for uniformly dispersing the fibers in the air, a forming drum 71 into which the fibers and the binder resin are charged is disposed in the deposition unit 70. Then, by rotating the forming drum 71, the binder resin (additive) can be uniformly mixed in the passing material (fiber). The forming drum 71 is provided with a screen having a plurality of small holes. Then, the forming drum 71 is driven to rotate so that the binder resin (additive) is uniformly mixed in the passing material (fiber), and the fiber and the mixture of the fiber and the binder resin that have passed through the small holes are uniformly mixed in the air. Can be dispersed.

  A mesh belt 73 is disposed below the forming drum 71. In addition, a suction device 75 as a suction unit that generates an airflow directed vertically downward is provided below the forming drum 71 via a mesh belt 73. The suction device 75 can suck the fibers dispersed in the air onto the mesh belt 73.

  The fibers and the like that have passed through the small hole screen of the forming drum 71 are deposited on the mesh belt 73 by the suction force of the suction device 75. At this time, by moving the mesh belt 73 in one direction, it is possible to form a web W that includes fibers and a binder resin and is deposited in a long shape. By continuously dispersing from the forming drum 71 and moving the mesh belt 73, a continuous belt-like web W is formed. The mesh belt 73 may be made of metal, resin, or non-woven fabric, and may be any material as long as fibers can be deposited and an air stream can pass therethrough. Note that if the mesh hole diameter of the mesh belt 73 is too large, fibers enter between the meshes, resulting in unevenness when the web W (sheet) is formed. On the other hand, if the mesh hole diameter is too small, the suction device 75. It is difficult to form a stable airflow. For this reason, it is preferable to adjust the hole diameter of a mesh suitably. The suction device 75 can be configured by forming a sealed box with a window of a desired size opened under the mesh belt 73, and sucking air from other than the window to make the inside of the box have a negative pressure from the outside air.

  The web W formed on the mesh belt 73 is transported according to the transport direction (the white arrow in the figure) by the rotational movement of the mesh belt 73. A peeling portion 90 is disposed on the upper side of the mesh belt 73. The web W is peeled off from the mesh belt 73 by the peeling unit 90 and conveyed to the conveying unit 100 side. The peeling unit 90 is configured to be able to convey the web W while sucking the web W vertically upward (the direction in which the web W is separated from the mesh belt 73). The peeling portion 90 is arranged vertically apart from the mesh belt 73 (a direction perpendicular to the surface of the web W), and a part of the peeling portion 90 is shifted to the downstream side in the conveyance direction of the web W. Has been placed. The conveyance section of the peeling unit 90 is a section from the stretching roller 72 a on the downstream side of the mesh belt 73 to the first conveyance roller pair 110 that constitutes a part of the conveyance unit 100.

  The peeling unit 90 includes a conveyance belt 91, a plurality of stretching rollers 92, and a suction chamber 93. The conveyor belt 91 is an endless mesh belt on which a mesh stretched by a stretch roller 92 is formed. Then, at least one of the plurality of stretching rollers 92 rotates, so that the conveyor belt 91 rotates (moves) in one direction.

  The suction chamber 93 is disposed inside the transport belt 91, has a hollow box shape having an upper surface and four side surfaces in contact with the upper surface, and a bottom surface (a surface facing the transport belt 91 positioned below). Is open. The suction chamber 93 includes a suction unit that generates an air flow (suction force) in the suction chamber 93. Then, by driving the suction part, the internal space of the suction chamber 93 is sucked and air flows from the bottom surface of the suction chamber 93. As a result, an air flow is generated toward the upper side of the suction chamber 93, and the web W can be sucked from above the web W to adsorb the web W to the conveyance belt 91. Then, the conveyor belt 91 moves (circulates) as the stretching roller 92 rotates, and can transport the web W toward the first conveyor roller pair 110. Further, the suction chamber 93 is disposed at a downstream position where the mesh chamber 73 partially overlaps with the suction device 75 when viewed from above, and the web W on the mesh belt 73 is placed in the suction chamber. It can be peeled off from the mesh belt 73 at a position opposite to 93 and attracted to the conveyor belt 91. The tension roller 92 rotates so that the conveyance belt 91 moves at the same speed as the mesh belt 73. If there is a difference in speed between the mesh belt 73 and the conveyor belt 91, the web W can be prevented from being pulled and broken or buckled by setting the same speed.

  A first transport roller pair 110 constituting a part of the transport unit 100 is disposed on the downstream side of the peeling unit 90 in the transport direction of the web W. The conveyance unit 100 conveys the deposit (web W) accumulated in the accumulation unit 70. The conveyance unit 100 includes a first conveyance roller pair 110, a second conveyance roller pair 120 provided on the downstream side of the first conveyance roller pair 110, and the first conveyance roller pair 110 and the second conveyance roller pair 120. And a tension mechanism 115 provided between the first transport roller pair 110 and the second transport roller pair 120.

  The first transport roller pair 110 presses the transported web W. The first transport roller pair 110 includes a pair of pressure rollers 111 and 112. The first transport roller pair 110 includes a sandwiching portion 110 a that sandwiches the web W between the pressure roller 111 and the pressure roller 112. Of the pair of pressure rollers 111 and 112, one roller is a driving roller (in this embodiment, a pressure roller 112) that rotates by driving a motor, and the other roller is a driven roller (in this embodiment, a pressure roller). 111). Then, the web W can be pressurized by rotating the pair of pressure rollers 111 and 112 and transporting the web W while being pinched by the sandwiching portion 110a. For example, the first conveyance roller pair 110 presses the web W so that the web W has a thickness of about 1/5 to 1/30 of the thickness of the web W formed by the deposition unit 70. Thereby, the strength of the web W can be improved.

  A guide portion 114 is disposed on the downstream side of the first conveyance roller pair 110 in the conveyance direction of the web W. And the front-end | tip part of the web W (deposit) which passed the 1st conveyance roller pair 110 is guided toward the 2nd conveyance roller pair 120 along the guide part 114. FIG. Here, the guide portion 114 is disposed below the pinching portion 110a of the first transport roller pair 110 in the vertical direction. Since the front end portion of the web W (deposit) that has passed through the first transport roller pair 110 is transported downward in the vertical direction due to gravity, the second transport roller can easily move the front end portion of the web W (deposit). Guidance can be directed toward the pair 120.

  The second conveyance roller pair 120 is disposed on the downstream side of the first conveyance roller pair 110 in the conveyance direction of the web W, more specifically, on the downstream side of the guide portion 114. The second transport roller pair 120 heats and presses the web W as a deposit deposited in the deposition unit 70 and binds the fibers included in the web W through a binder resin. The second transport roller pair 120 of the present embodiment includes a pair of heating rollers 121 and 122. A heating member such as a heater is provided at the center of the rotating shaft of the heating rollers 121 and 122, and the web W being conveyed is heated by passing the web W between the pair of heating rollers 121 and 122. Can be pressurized. Of the pair of heating rollers 121 and 122, one roller is a driving roller (heating roller 122 in this embodiment) that rotates by driving a motor, and the other roller is a driven roller (heating roller 121 in this embodiment). ). The web W is heated and pressurized by the pair of heating rollers 121 and 122, so that the binder resin is melted and easily entangled with the fibers, and the fiber interval is shortened and the contact point between the fibers is increased.

  A tension mechanism 115 is disposed between the first transport roller pair 110 and the second transport roller pair 120 of the transport unit 100. The tension mechanism 115 biases the web W to be conveyed. The tension mechanism 115 of this embodiment includes a tension roller 116 and is configured to be able to bias the web W conveyed by the tension roller 116. And it is comprised so that tension | tensile_strength may be provided to the web W, after the front-end | tip part of the web W is clamped by the 2nd conveyance roller pair 120. FIG. A detailed configuration of the transport unit 100 will be described later.

  On the downstream side in the conveyance direction of the second conveyance roller pair 120, as a cutting unit 130 for cutting the web W, a first cutting unit 130a for cutting the web W along the conveyance direction of the web W, and a conveyance direction of the web W, A second cutting portion 130b that cuts the web W in the intersecting direction is disposed. The first cutting unit 130 a is, for example, a slitter, and cuts according to a predetermined cutting position in the web W conveyance direction. The second cutting unit 130b is, for example, a rotary cutter, and cuts the continuous web W into a single sheet according to a cutting position set to a predetermined length. Thereby, a sheet Pr (web W) having a desired size is formed. The cut sheets Pr are stacked on the stacker 160 or the like. In addition, you may comprise so that the web W may be wound up with a winding roller, without cutting, the web W. As described above, the sheet Pr can be manufactured in the sheet manufacturing apparatus 1.

  In addition, the sheet | seat concerning the said embodiment mainly says what used the thing containing fibers, such as used paper and a pure pulp, as a raw material, and was made into the sheet form. However, the shape is not limited to that, and may be a board shape or a web shape (or a shape having irregularities). The raw material may be plant fibers such as cellulose, chemical fibers such as PET (polyethylene terephthalate) and polyester, and animal fibers such as wool and silk. In the present application, the sheet is divided into paper and non-woven fabric. The paper includes a thin sheet form, and includes recording paper for writing and printing, wallpaper, wrapping paper, colored paper, Kent paper, and the like. Nonwoven fabrics are thicker or lower in strength than paper and include nonwoven fabrics, fiber boards, tissue paper, kitchen paper, cleaners, filters, liquid absorbents, sound absorbers, cushioning materials, mats, and the like.

  In the present embodiment, the used paper mainly refers to printed paper. However, if used as a raw material, it is regarded as used paper regardless of whether it is used.

  Next, a detailed configuration of the transport unit 100 will be described. FIG. 2 is a schematic diagram illustrating the configuration of the first transport roller pair, and FIG. 3 is a schematic diagram illustrating the configuration of the transport unit. As shown in FIGS. 2 and 3, the transport unit 100 includes a first transport roller pair 110, a second transport roller pair 120, a guide unit 114, a tension mechanism 115, and the like.

  As shown in FIG. 2, the first conveying roller pair 110 conveys a virtual line L1 connecting the rotation center axis C2 of the pressure roller 112 as a driving roller and the rotation center axis C1 of the pressure roller 111 as a driven roller. It arrange | positions so that it may incline toward the direction downstream. More specifically, the pressure roller 112 is arranged on the lower side of the pressure roller 111, and when a line extending in the vertical direction passing through the rotation center axis C2 of the pressure roller 112 is defined as a virtual line L0, the virtual line L0. On the other hand, the virtual line L1 is inclined toward the downstream side in the conveyance direction of the web W. For this reason, the front-end | tip part of the web W can be reliably guide | induced toward the guide part 114 arrange | positioned below the clamping part 110a of the 1st conveyance roller pair 110 perpendicularly | vertically.

  In addition, the pressure roller 112 as the lower roller in the vertical direction is a harder roller than the pressure roller 111 as the upper roller in the first conveyance roller pair 110. That is, the first transport roller pair 110 includes a pressure roller 112 that is a hard roller and a pressure roller 111 that is a soft roller, and the respective hardnesses are different. For example, the hard roller is made of metal, and the soft roller is made of resin, rubber, or the like. Thereby, the hardness on the surface of the pressure roller 112 of the hard roller is higher than the hardness on the surface of the pressure roller 111 of the soft roller. Therefore, as shown in FIG. 2, when the conveyed web W is pressed by the first conveying roller pair 110, the holding portion 110 a formed by the pressing roller 112 of the hard roller and the pressing roller 111 of the soft roller The pressure roller 112 of the roller bites into the pressure roller 111 side of the soft roller, and the recess D is formed on the surface of the pressure roller 111. Then, since the web W is conveyed while being pressed in accordance with the shape of the concave portion D, the web W that has passed through the sandwiching portion 110a is in the direction in which the pressure roller 112 of the hard roller is disposed, that is, the sandwiching portion 110a. It is conveyed so as to curl downward. The web W passing through the first conveying roller pair 110 can be bent and conveyed in the direction toward the guide portion 114 side.

  As shown in FIG. 3, the second transport roller pair 120 is disposed on the downstream side in the transport direction of the first transport roller pair 110. Further, a deposit detection unit 126 that detects the presence or absence of the web W (deposit) is disposed on the downstream side in the transport direction of the second transport roller pair 120. The deposit detection unit 126 is connected to the control unit 2 so that a detection result can be transmitted. The deposit detection unit 126 is, for example, a transmissive or reflective photointerrupter, and includes a light emitting unit that emits light and a light receiving unit that receives the light emitted from the light emitting unit. As the light emitting element of the light emitting unit, for example, an LED (Light Emitting Diode) light emitting element, a laser light emitting element, or the like is applied. In addition, the light receiving unit includes a phototransistor, a photo IC, and the like. Thereby, the presence or absence of the web W (deposit) can be detected. More specifically, the control unit 2 can determine whether the tip of the web W has passed over the deposit detection unit 126 based on the output of the deposit detection unit 126.

  Further, the tension mechanism 115 has a switching unit (not shown) configured by a solenoid connected to the control unit 2, and when the deposit detection unit 126 detects that the web W is present, the tension unit 115 performs tensioning by the switching unit. The mechanism 115 can be switched from the retracted position P0 to the first tension applying position P1 among the tension applying positions.

  The retracted position P0 is a position where the tension mechanism 115 does not interfere with the tip of the web W that has passed through the first transport roller pair 110, and is set as a position above the first tension applying position P1. The first tension applying position P1 is a position where tension can be applied to the web W sandwiched between the pair of transport rollers 110 and 120 between the first transport roller pair 110 and the second transport roller pair 120. Yes, it is set as a position below the retreat position P0. The retreat position P0 and the first tension applying position P1 are set at the position of the tension roller 116.

  In the present embodiment, after tension is applied to the web W by the tension mechanism 115, the peripheral speed of the driving roller of the second transport roller pair 120 is made slower than the peripheral speed of the drive roller of the first transport roller pair 110. Repeat the switching operation to make it faster. As a result, it is possible to remove the slack of the web W being conveyed and to carry it stably without waviness. Here, when the peripheral speed of the drive roller of the second transport roller pair 120 is faster than the peripheral speed of the drive roller of the first transport roller pair 110, the first transport roller pair 110 and the second transport roller pair 120 The amount of slackness of the web W in the meantime decreases. For this reason, the tension roller 116 moves upward following the amount of looseness that decreases. On the other hand, when the peripheral speed of the drive roller of the second transport roller pair 120 is made slower than the peripheral speed of the drive roller of the first transport roller pair 110, between the first transport roller pair 110 and the second transport roller pair 120. The amount of slack in the web W increases. For this reason, the tension roller 116 moves downward following the increasing amount of slack.

  Here, the slack detection unit 117 detects the slack of the web W between the first transport roller pair 110 and the second transport roller pair 120. The slack detection unit 117 is connected to the control unit 2 so that a detection result can be transmitted. Then, the slack detection unit 117 can detect that the slack amount of the web W is the first value and that the second value is larger than the first value. When the slack detection unit 117 detects that the slack amount is the first value, the peripheral speed of the driving roller of the second transport roller pair 120 is set to be higher than the peripheral speed of the driving roller of the first transport roller pair 110. When the slackness detection unit 117 detects that the slackness is the second value, the peripheral speed of the driving roller of the second transport roller pair 120 is set to be less than the peripheral speed of the drive roller of the first transport roller pair 110. Also make it faster.

  The slack detection unit 117 of this embodiment includes a first detection unit 118 that detects a slack amount of a first value and a second detection unit 119 that detects a slack amount of a second value. The first detection unit 118 and the second detection unit 119 are, for example, micro switches, and each of the first detection unit 118 and the second detection unit 119 includes actuators 118a and 119a. When the tension roller 116 comes into contact with the actuator 118a of the first detection unit 118, the switch is turned on, and the peripheral speed of the driving roller of the second transport roller pair 120 is set to be higher than the peripheral speed of the drive roller of the first transport roller pair 110. Slow down. That is, the slack amount of the web W between the first transport roller pair 110 and the second transport roller pair 120 is increased. On the other hand, when the tension roller 116 comes into contact with the actuator 119a of the second detection unit 119, the switch is turned on, and the peripheral speed of the driving roller of the second transport roller pair 120 is set higher than the peripheral speed of the drive roller of the first transport roller pair 110. Make it faster. That is, the slack amount of the web W between the first transport roller pair 110 and the second transport roller pair 120 is reduced.

  In the present embodiment, the position where the actuator 118a of the first detection unit 118 and the tension roller 116 are in contact is the upper limit position P3, and the position where the actuator 119a of the second detection unit 119 is in contact with the tension roller 116 is the lower limit position. . The lower limit position is set as the second tension applying position P2. The upper limit position P3 is set above the first tension applying position P1.

  Next, a control method for the sheet manufacturing apparatus will be described. In the present embodiment, a method for controlling the transport unit will be mainly described. 4, 5, and 6 are operation diagrams of the conveyance unit illustrating a control method of the sheet manufacturing apparatus.

  First, each part of the sheet manufacturing apparatus 1 is driven. Specifically, the used paper Pu is supplied from the supply unit 10, and the supplied used paper Pu is defibrated by the defibrating unit 30. Thereafter, the defibrated material that has been defibrated is input to the sorting unit 50 via the classifying unit 40. In the sorting unit 50, the sieve unit 51 is rotated, and the passing material that has passed through the opening of the sieve unit 51 is put into the deposition unit 70. In the depositing unit 70, the forming drum 71 is rotated, and the fibers that have passed through the small hole screen of the forming drum 71 are deposited on the mesh belt 73 (web W is formed). Then, the web W formed on the mesh belt 73 is peeled off from the mesh belt 73 by the peeling unit 90, and the web W peeled off from the mesh belt 73 is transported to the first transport roller pair 110 side of the transport unit 100.

  In the first conveying roller pair 110, as shown in FIG. 4A, the pressure roller 112 of the driving roller is rotationally driven, and the leading end portion Wt of the web W conveyed from the peeling unit 90 side is sandwiched. At this time, the front end portion Wt of the web W sandwiched between the first transport roller pair 110 is transported toward the guide portion 114 disposed below the sandwiching portion 110a of the first transport roller pair 110 in the vertical direction ( (See FIG. 2). And it is conveyed to the 2nd conveyance roller pair 120 side following the conveyance surface of the guide part 114. FIG. At this time, the tension roller 116 of the tension mechanism 115 is located at the retracted position P0. That is, the tension mechanism 115 is retracted so as not to come into contact with the front end portion Wt of the web W conveyed by the first conveyance roller pair 110. Thereby, problems, such as jam, can be avoided and the web W can be conveyed.

  Next, in the second conveyance roller pair 120, as shown in FIG. 4B, the heating roller 122 of the driving roller is rotationally driven, and the leading end portion Wt of the web W conveyed from the first conveyance roller pair 110 side is sandwiched. It is inserted between the portions 120a. The front end Wt of the web W conveyed from the first conveyance roller pair 110 side is conveyed along the conveyance surface of the guide portion 114, and the tension roller 116 of the tension mechanism 115 is located at the retracted position P0. There is no obstacle to W transport. For this reason, the front-end | tip part Wt of the web W can be pinched | interposed into the 2nd conveyance roller pair 120 automatically.

  Thereafter, when the leading end Wt of the web W enters the detection area of the deposit detection unit 126 disposed on the downstream side in the conveyance direction of the second conveyance roller pair 120, the deposit detection unit 126 causes the web W (deposit) to be present. It is detected. In other words, the detection state of the deposit detection unit 126 changes from “no” to the web W (deposit) “present”. Then, the solenoid mechanism provided in the tension mechanism 115 is driven to switch the position of the tension mechanism 115 (tension roller 116) from the retracted position P0 to the first tension applying position P1. Furthermore, at this time, the peripheral speed of the second transport roller pair 120 is set to the first time during a predetermined period after at least the tip Wt of the web W (deposit) is sandwiched between the second transport roller pair 120 (the sandwiching section 120a). It becomes faster than the peripheral speed of the conveyance roller pair 110. That is, the peripheral speed of the second transport roller pair 120 is higher than the peripheral speed of the first transport roller pair 110 for a predetermined period after at least the tip Wt of the web W (deposit) is sandwiched between the second transport roller pair 120. At least one of the drive rollers (112) of the first transport roller pair 110 and the drive roller (122) of the second transport roller pair 120 is driven and controlled so as to be faster. The difference in peripheral speed between the driving roller of the first conveying roller pair 110 and the driving roller of the second conveying roller pair 120 is relative. Therefore, the drive roller of the first transport roller pair 110 may be controlled, or the drive roller of the second transport roller pair 120 may be controlled. Furthermore, you may control both the drive roller of the 1st conveyance roller pair 110, and the drive roller of the 2nd conveyance roller pair 120. FIG. In addition, during the predetermined period during which drive control is performed so that the peripheral speed of the drive roller of the second transport roller pair 120 is faster than the peripheral speed of the drive roller of the first transport roller pair 110, that is, the tip of the web W (deposit). The predetermined period after the portion Wt is sandwiched between the second transport roller pair 120 is a period during which the tension roller 116 moves from the first tension applying position P1 to the upper limit position P3.

  And as shown in FIG.4 (b), if drive control is carried out so that the circumferential speed of the drive roller of the 2nd conveyance roller pair 120 may become faster than the circumferential speed of the drive roller of the 1st conveyance roller pair 110, it will be 1st conveyance. The amount of slackness of the web W between the roller pair 110 and the second transport roller pair 120 becomes smaller (less). Thereafter, as shown in FIG. 5C, the web W comes into contact with the tension roller 116, and tension is applied to the web W. In the present embodiment, tension is applied to the web W by the weight of the tension roller 116. Thereby, the stable conveyance without the slack and the wave | undulation of the web W is attained.

  Further, when the web W is transported while being tensioned by the tension roller 116, the amount of slackness of the web W between the first transport roller pair 110 and the second transport roller pair 120 is further reduced (reduced). . Along with this, the tension roller 116 also rises. Then, as shown in FIG. 5D, when the tension roller 116 reaches the upper limit position P3, the tension roller 116 contacts the actuator 118a of the first detection unit 118 of the slack detection unit 117 (see FIG. 3B). ). Thereby, it is determined that the slack amount of the web W between the first transport roller pair 110 and the second transport roller pair 120 is the first value, and the peripheral speed of the driving roller of the second transport roller pair 120 is determined as follows. It is slower than the peripheral speed of the driving roller of the first transport roller pair 110. Accordingly, as illustrated in FIG. 6E, the transport amount of the web W in the first transport roller pair 110 is larger than the transport amount of the web W in the second transport roller pair 120. The amount of slackness of the web W between the pair 110 and the second transport roller pair 120 increases (increases). Along with this, the tension roller 116 descends while applying tension to the web W.

  As shown in FIG. 6F, when the tension roller 116 reaches the second tension applying position (lower limit position) P2, the tension roller 116 contacts the actuator 119a of the second detection unit 119 of the slack detection unit 117. (See FIG. 3B). Thereby, it is determined that the slack amount of the web W between the first transport roller pair 110 and the second transport roller pair 120 is a second value larger than the first value, and the second transport roller pair 120 The circumferential speed of the driving roller is made faster than the circumferential speed of the driving roller of the first transport roller pair 110. Thereby, since the conveyance amount of the web W in the 2nd conveyance roller pair 120 becomes larger than the conveyance amount of the web W in the 1st conveyance roller pair 110, the 1st conveyance roller pair 110, the 2nd conveyance roller pair 120, The amount of slackness of the web W during the period becomes smaller (less). Along with this, the tension roller 116 rises while applying tension to the web W. Thereafter, the tension roller 116 moves between the upper limit position P3 and the lower limit position (second tension applying position) P2 according to the amount of slackness of the web W while applying tension to the web W. Accordingly, the switching control of the peripheral speeds of the driving roller of the first conveying roller pair 110 and the driving roller of the second conveying roller pair 120 is repeatedly performed.

  As described above, according to the present embodiment, the following effects can be obtained.

  The leading end Wt of the web W transported by the first transport roller pair 110 is transported to the second transport roller pair 120 following the guide portion 114, and is sandwiched by the second transport roller pair 120 (the sandwiching section 120a). At this time, the tension mechanism 115 is in the state of being retracted to the retracted position P0 until the leading end Wt of the web W is sandwiched between the second transport roller pair 120, and thus does not hinder the movement of the leading end Wt of the web W. . Thereby, the conveyance malfunction of the web W at the time of the shaping | molding start of the web W (sheet | seat Pr) can be reduced. In addition, after the leading end Wt of the web W has passed through the second transport roller pair 120, the drive control related to the peripheral speed between the drive roller of the first transport roller pair 110 and the drive roller of the second transport roller pair 120 is constant. Performed under the tension of Thereby, the slack and the undulation of the web W between the first transport roller pair 110 and the second transport roller pair 120 are eliminated, and the web W can be transported in a stable state.

  The present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below. Modifications may be combined.

  (Modification 1) In the above embodiment, the slack detection unit 117 includes the first detection unit 118 and the second detection unit 119 at the upper limit position P3 and the lower limit position P2, respectively. However, the present invention is not limited to this configuration. For example, the configuration may be such that the upper limit position P3 and the lower limit position P2 are detected by one sensor or the like using a photosensor or the like. In this way, the slack detection unit can be easily configured.

  (Modification 2) In the above embodiment, the configuration of the transport control of the web W between the first transport roller pair 110 and the second transport roller pair 120 has been described, but the present invention is not limited to this configuration. In addition to the first transport roller pair 110 and the second transport roller pair 120, another transport roller pair for transporting the web W, for example, a third transport roller pair is arranged on the downstream side of the first cutting unit 130a, and the above-described implementation You may perform the control similar to a form. That is, in the same manner as in the above embodiment, between each pair of transport rollers adjacent in the transport direction of the web W (the first transport roller pair 110 and the second transport roller pair 120 and the second transport roller pair 120 and the third transport roller pair). You may comprise so that control of this may be performed. Even if it does in this way, the effect similar to the said effect can be acquired.

  DESCRIPTION OF SYMBOLS 1 ... Sheet manufacturing apparatus, 2 ... Control part, 10 ... Supply part, 20 ... Crushing part, 30 ... Defibration part, 40 ... Classification part, 50 ... Sorting part, 60 ... Additive input part, 70 ... Deposition part, DESCRIPTION OF SYMBOLS 90 ... peeling part, 100 ... conveyance part, 110 ... 1st conveyance roller pair, 110a ... clamping part, 114 ... guide part, 115 ... tension mechanism, 116 ... tension roller, 117 ... slack detection part, 118 ... 1st detection part DESCRIPTION OF SYMBOLS 119 ... 2nd detection part, 120 ... 2nd conveyance roller pair, 126 ... Deposit detection part, 130 ... Cutting part, 160 ... Stacker.

Claims (7)

A defibrating unit for defibrating a raw material containing fibers, a depositing unit for depositing at least a part of the defibrated material defibrated in the defibrating unit, and a conveying unit for conveying the deposit deposited in the depositing unit A sheet manufacturing apparatus comprising:
The transport unit is
A first conveying roller pair;
A second conveyance roller pair provided on the downstream side of the first conveyance roller pair;
A guide unit provided between the first transport roller pair and the second transport roller pair, for guiding a tip portion of the deposit toward the second transport roller pair, the first transport roller pair A guide portion disposed vertically below the sandwiching portion of
A tension mechanism that is provided between the first transport roller pair and the second transport roller pair and biases the deposit, and a tip portion of the deposit is sandwiched between the second transport roller pair And a tension mechanism for applying tension to the deposit. In the sheet manufacturing apparatus according to claim 1,
A deposit detector provided on the downstream side in the transport direction of the second transport roller pair, and detecting the presence or absence of the deposit;
A sheet manufacturing apparatus comprising: a switching unit that switches the tension mechanism from a retracted position to a tension applying position when the deposit detecting unit detects the presence of the deposit. In the sheet manufacturing apparatus according to claim 1 or 2,
The sheet conveying apparatus, wherein the first conveying roller pair is arranged such that an imaginary line connecting the rotation center axis of the driving roller and the rotation center axis of the driven roller is inclined toward the downstream side in the conveying direction. In the sheet manufacturing apparatus according to any one of claims 1 to 3,
The sheet manufacturing apparatus according to claim 1, wherein the roller on the lower side in the vertical direction is harder than the roller on the upper side in the vertical direction in the first conveying roller pair. In the sheet manufacturing apparatus according to any one of claims 1 to 4,
The peripheral speed of the drive roller of the second transport roller pair is at least as high as the peripheral speed of the drive roller of the first transport roller pair for a predetermined period after the tip of the deposit is sandwiched between the second transport roller pair. Sheet manufacturing equipment characterized by being fast. In the sheet manufacturing apparatus according to any one of claims 1 to 5,
After applying tension to the deposit by the tension mechanism, a switching operation is performed to make the peripheral speed of the driving roller of the second transport roller pair slower and faster than the peripheral speed of the drive roller of the first transport roller pair. A sheet manufacturing apparatus that repeats. In the sheet manufacturing apparatus according to claim 6,
A slack detecting unit for detecting slack of a deposit between the first transport roller pair and the second transport roller pair, wherein the slack amount of the deposit is a first value; A slack detection unit capable of detecting that the second value is greater than the value of
When the slack detection unit detects that the slack amount is the first value, the peripheral speed of the driving roller of the second transport roller pair is made slower than the peripheral speed of the drive roller of the first transport roller pair. And
When the slack detection unit detects that the slack amount is the second value, the peripheral speed of the driving roller of the second transport roller pair is made faster than the peripheral speed of the drive roller of the first transport roller pair. A sheet manufacturing apparatus characterized by:

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