Sheet manufacturing apparatus

Abstract

The invention provides a sheet manufacturing device which improves the measuring accuracy of paper sheets. The sheet manufacturing apparatus (1) is provided with a measuring unit (15a) that measures a sheet (C). The measuring unit (15a) has: a first frame unit (101F); a second frame part (154a) which is distinguished from the first frame part (101F); a lid part (152a) on which a sheet of paper (C) to be metered is placed in a closed state and which, in an open state, conveys the metered sheet of paper (C) to a downstream joining part (17); a sensor unit (153a) that measures the mass of the paper sheet (C) placed on the cover unit (152a); and a shutter section (155a) capable of closing the space between the lid section (152a) and the joining section (17), the sensor section (153a) being attached to the first frame section (101F), and the shutter section (155a) being attached to the second frame section (154a).

Description

Technical Field

[0001] The present invention relates to a thin sheet manufacturing device. Background Art

[0002] Conventionally, there is known a device for compressing fibers obtained from paper pieces or the like to produce sheets or the like. Among such devices, there is a device having a mechanism for weighing an aggregate of paper pieces or fibers. For example, Patent Document 1 discloses a device for automatically correcting the weight measurement of inferior cotton.

[0003] However, the device described in Patent Document 1 has a problem that it is difficult to improve the metering accuracy of inferior cotton, which is an aggregate of fibers. Specifically, vibrations generated by the operation of a compression mechanism or a conveyor may be transmitted to a meter. In addition, if a mechanism that uses airflow to transport inferior cotton or the like is used, the meter may be affected by the airflow. That is, a sheet manufacturing device that improves the metering accuracy of paper sheets is required.

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 7-3537 Summary of the invention

[0005] The thin sheet manufacturing device is characterized in that it has a first measuring unit, which measures paper sheets, and the first measuring unit has: a first frame unit; a second frame unit, which is distinguished from the first frame unit; a first cover unit, which is placed with paper sheets to be measured in a closed state and conveys the measured paper sheets to a downstream conveying pipe in an open state; a first sensor unit, which measures the mass of the paper sheets placed on the first cover unit; and a first baffle unit, which can block the space between the first cover unit and the conveying pipe, the first sensor unit is installed on the first frame unit, and the first baffle unit is installed on the second frame unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram showing the structure of a sheet manufacturing apparatus according to an embodiment.

[0007] Figure 2 It is a cross-sectional view showing the structure of a measuring unit, etc.

[0008] Figure 3 It is a perspective view showing the structure of the first frame portion.

[0009] Figure 4 It is a perspective view showing the arrangement of the second frame portion and the like.

[0010] Figure 5 It is a cross-sectional view showing the structure of a measuring unit, etc.

[0011] Figure 6 It is a sectional perspective view showing the configuration of the paper barrel part and the sensor part.

[0012] Figure 7 It is a cross-sectional view showing a state where the cover portion and the shutter portion are opened.

[0013] Figure 8 It is a cross-sectional perspective view showing a state in which the cover portion and the shutter portion are opened.

[0014] Fig. 9 It is a perspective view showing the structure of the opening and closing mechanism of the cover.

[0015] Fig.10 It is a perspective view showing the arrangement of the vibration absorbing part.

[0016] Fig.11 It is a cross-sectional view showing the vibration absorbing part. DETAILED DESCRIPTION

[0017] In the following embodiment, a sheet manufacturing device 1 for regenerating paper sheets such as waste paper by a dry method is exemplified and described with reference to the accompanying drawings. The sheet manufacturing device of the present invention is not limited to a dry method, but may also be a wet method. In addition, in this specification, a dry method refers to a method that is not performed in a liquid but is performed in air such as the atmosphere.

[0018] In the following drawings, the XYZ axes are marked as mutually orthogonal coordinate axes, and the direction pointed by each arrow mark is set as the + direction, and the direction opposite to the + direction is set as the - direction. The Z axis is an imaginary axis along the vertical direction, and the +Z direction is set as the upper direction and the -Z direction is set as the lower direction. The -Z direction is the direction in which gravity acts. In the sheet manufacturing device 1, the destination of the conveying direction of the raw material, paper sheet, material sheet, sheet, etc. is sometimes called the downstream, and the side of the retracing conveying direction is called the upstream. For the convenience of illustration, the size of each component is different from the actual situation.

[0019] like Figure 1 As shown in FIG. 1 , the sheet manufacturing apparatus 1 according to the present embodiment includes a first unit group 101, a second unit group 102, and a third unit group 103. Figure 1 In FIG. 1 , the directions in which the paper pieces C, the thin sheets P3, the cut pieces S, and unnecessary end materials, which are waste paper, move are shown by blank arrow marks.

[0020] The sheet manufacturing apparatus 1 manufactures a sheet P3 from a paper sheet C. 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 toward the +Y direction when viewed from the side in the −X direction.

[0021] The paper piece C is transported from the first unit group 101 to the second unit group 102 via the pipe 21 that crosses the third unit group 103. Then, the paper piece C is subjected to defibration and the like in the second unit group 102 to become fibers, and then is made into a mixture containing a binder and the like. The mixture is transported to the third unit group 103 via the pipe 24. After the mixture is made into a web W in the third unit group 103, it is formed into a strip-shaped sheet P1. The strip-shaped sheet P1 is cut in the first unit group 101 to become a sheet P3.

[0022] The first unit group 101 includes a buffer tank 13, a discharge pipe 14, a measuring unit 15, a confluence unit 17, and a pipe 21. In the first unit group 101, these structures are arranged in the above order from upstream to downstream. In addition, the first unit group 101 also includes a first cutting unit 81, a second cutting unit 82, a tray 91, and a shredding unit 95. The first cutting unit 81 and the second cutting unit 82 cut the strip-shaped sheet P1 into sheets P3 of a predetermined shape. In addition, the first unit group 101 includes 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 the first humidification unit 65 and the second humidification unit 66 described later through a water supply pipe not shown in the figure.

[0023] Paper pieces C are put into the buffer box 13 from the raw material inlet 11. The paper pieces C are, for example, shredded waste paper containing fibers such as cellulose. Humidified air is supplied from the second humidifying unit 66 included in the third unit group 103 to the inside of the buffer box 13.

[0024] The paper pieces C are temporarily stored in the buffer box 13 and then conveyed to the measuring unit 15 through the discharge pipe 14. The sheet manufacturing apparatus 1 may include a shredder on the upstream side of the buffer box 13 for shredding the paper pieces C and the like.

[0025] The measuring unit 15 measures the paper sheets C. Although not shown in the figure, the measuring unit 15 includes a sensor unit for measuring the mass of the paper sheets C and a cover unit for placing the paper sheets C during measurement. The measuring unit 15 measures the paper sheets C according to a predetermined mass each time and supplies the paper sheets C to the downstream confluence unit 17. The details of the measuring unit 15 will be described later.

[0026] In the confluence section 17, the paper pieces C supplied from the measuring section 15 and the shredded pieces of the cut pieces S supplied from the shredding section 95 are merged and mixed. The confluence section 17 is a pipe for conveying the paper pieces C and the cut pieces S, which is equivalent to a conveying pipe. The cut pieces S and the shredding section 95 will be described later. The paper pieces C mixed with the cut pieces flow from the confluence section 17 into the pipe 21.

[0027] The pipe 21 conveys the paper sheet C from the first unit group 101 to the second unit group 102 by the suction airflow generated by the downstream defibrating unit 31 .

[0028] The second unit group 102 has a defibration unit 31 as a dry defibrator, a separation unit 32, a pipe 23, a mixing unit 33 and a pipe 24. In the second unit group 102, these structures are arranged in the above order from upstream to downstream. In addition, the second unit group 102 also has a pipe 25 connected to the separation unit 32, a recovery unit 35, a compressor 38 and a power supply unit 39.

[0029] The paper pieces C conveyed through the pipe 21 flow into the defibrating unit 31. The defibrating unit 31 defibrates the paper pieces C supplied from the measuring unit 15 into fibers by a dry method. A known defibrating mechanism can be applied to the defibrating unit 31.

[0030] As the defibration unit 31, for example, the following structure can be cited. The defibration unit 31 includes a stator and a rotor. The stator has a substantially cylindrical inner surface. The rotor is disposed inside the stator and rotates along the inner surface of the stator. The cut pieces of the paper sheet C are sandwiched between the inner surface of the stator and the rotor, and are defibrated by the cutting force generated therebetween. As a result, the entangled fibers contained in the paper sheet C are disassembled. The paper sheet C is set as fibers and conveyed to the separation unit 32.

[0031] The separation unit 32 classifies the defibrated fibers. Specifically, the separation unit 32 removes components contained in the fibers that are not necessary for the manufacture of the sheet P3. Specifically, the separation unit 32 classifies relatively long fibers and relatively short fibers. Since relatively short fibers sometimes reduce the strength of the sheet P3, they are classified by the separation unit 32. In addition, the separation unit 32 also classifies and removes color materials and additives contained in the paper sheet C. For the separation unit 32, a known technology such as a disc screen method can be applied.

[0032] The humidified air is supplied from the second humidifying unit 66 of the third unit group 103 to the interior of the separation unit 32 .

[0033] The defibrated fibers pass through the separation unit 32 to remove relatively short fibers and the like, and are conveyed to the mixing unit 33 through the pipe 23. Unnecessary portions such as relatively short fibers and color materials are discharged to the recovery unit 35 through the pipe 25.

[0034] The mixing unit 33 mixes the binder and the like with the fibers in the air to form a mixture. Although not shown in the figure, the mixing unit 33 includes a flow channel for conveying the fibers, a fan, a hopper, a supply pipe, and a valve.

[0035] The hopper is connected to the flow channel of the fiber via a supply pipe. A valve is provided on the supply pipe between the hopper and the flow channel. The hopper supplies a binder such as starch into the flow channel. The valve adjusts the mass of the binder supplied from the hopper to the flow channel. Thus, the mixing ratio of the fiber and the binder is adjusted.

[0036] The mixing unit 33 has a similar structure for supplying a coloring material, an additive, and the like in addition to the above-mentioned structure for supplying the binder.

[0037] The fan of the mixing unit 33 uses the generated airflow to transport the fibers downstream and mix the binder and the like into the air to form a mixture. The mixture flows from the mixing unit 33 into the pipe 24 .

[0038] The recovery unit 35 includes a filter (not shown). The filter filters out unnecessary parts such as relatively short fibers conveyed from the pipe 25 by the airflow.

[0039] The compressor 38 generates compressed air. The filter may be clogged by fine particles in an unnecessary portion. The compressed air generated by the compressor 38 is blown toward the filter to blow off the attached particles and clean the filter.

[0040] The power supply unit 39 includes a control unit 5 and a power supply device (not shown) for supplying power to the sheet manufacturing device 1. The power supply unit 39 distributes the power supplied from the outside to each structure of the sheet manufacturing device 1. The control unit 5 is electrically connected to each structure of the sheet manufacturing device 1 and comprehensively controls the operation of these structures. In addition, the sheet manufacturing device 1 may also be a structure having a plurality of control units 5. In this case, the plurality of control units 5 share and control the work of the sheet manufacturing device 1 while cooperating with each other.

[0041] The third unit group 103 accumulates and compresses the mixture containing fibers to form a strip-shaped sheet P1 as recycled paper. The third unit group 103 includes an accumulation unit 50 , a first conveying unit 61 , a second conveying unit 62 , a first humidifying unit 65 , a second humidifying unit 66 , a drainage unit 68 , and a forming unit 70 .

[0042] In the third unit group 103 , the accumulation unit 50 , the first conveying unit 61 , the second conveying unit 62 , the first humidifying unit 65 , and the shaping unit 70 are arranged in the above order from upstream to downstream. The second humidifying unit 66 is arranged below the first humidifying unit 65 .

[0043] The accumulation unit 50 accumulates the mixture included in the classified fibers in the air to generate a web W. The accumulation unit 50 includes a roller member 53, a blade member 55 provided in the roller member 53, a housing 51 for housing the roller member 53, and a suction unit 59. The mixture is sucked into the roller member 53 from the pipe 24.

[0044] The first conveyor 61 is disposed below the accumulation unit 50. The first conveyor 61 includes a mesh belt 61a and five extension rollers (not shown) for extending the mesh belt 61a. The suction unit 59 faces the roller member 53 via the mesh belt 61a in the direction along the Z axis.

[0045] The blade member 55 is located inside the drum member 53 and is driven to rotate by a motor (not shown). The drum member 53 is a semi-cylindrical screen. A net having the function of a screen is provided on the side of the drum member 53 facing downward. The drum member 53 allows particles such as fibers or mixtures that are smaller than the size of the mesh opening of the screen to pass from the inside to the outside.

[0046] The mixture is stirred by the rotating blade member 55 in the drum member 53 and discharged to the outside of the drum member 53. The inside of the drum member 53 is supplied with humidified air from the second humidifying unit 66.

[0047] The suction unit 59 is disposed below the roller member 53. The suction unit 59 sucks the air in the housing 51 through the multiple holes of the mesh belt 61a. The multiple holes of the mesh belt 61a allow air to pass through, and make it difficult for fibers or adhesive materials contained in the mixture to pass through. As a result, the mixture released to the outside of the roller member 53 is sucked downward together with the air. The suction unit 59 is a well-known suction device such as a blower.

[0048] The mixture is dispersed in the air in the housing 51 , and is deposited on the upper surface of the mesh belt 61 a by gravity and suction by the suction unit 59 , thereby forming a web W.

[0049] The mesh belt 61a is an endless belt and is stretched by five stretching rollers. The mesh belt 61a is stretched by the self-rotation of the stretching rollers. Figure 1 The first conveying unit 61 rotates counterclockwise in the mesh belt 61. As a result, the mixture is continuously deposited on the mesh belt 61a to form a sheet W. The sheet W contains a relatively large amount of air and thus expands softly. The first conveying unit 61 conveys the formed sheet W downstream by rotating the mesh belt 61a.

[0050] The second conveying unit 62 replaces the first conveying unit 61 at the downstream of the first conveying unit 61 and conveys the web W. The second conveying unit 62 peels the web W from the upper surface of the mesh belt 61a and conveys it toward the forming unit 70. The second conveying unit 62 is located above the conveying path of the web W and is arranged slightly upstream of the starting point of the return side of the mesh belt 61a. The +Y direction of the second conveying unit 62 and the -Y direction of the mesh belt 61a partially overlap in the vertical direction.

[0051] The second conveying unit 62 includes a conveyor belt (not shown), a plurality of rollers, and a suction mechanism. The conveyor belt is provided with a plurality of holes for air to pass through. The conveyor belt is stretched over a plurality of rollers and rotated by the rotation of the rollers.

[0052] The second conveying unit 62 uses the negative pressure generated by the suction mechanism to suck the upper surface of the web W onto the lower surface of the conveyor belt. By rotating the conveyor belt in this state, the web W is sucked onto the conveyor belt and conveyed downstream.

[0053] The first humidifying section 65 humidifies the web W containing fibers accumulated by the accumulation section 50 of the third unit group 103. Specifically, the first humidifying section 65 is, for example, a mist humidifier, and supplies mist M from below to the web W conveyed by the second conveying section 62 to humidify the web W. The first humidifying section 65 is arranged below the second conveying section 62 and is opposite to the web W conveyed by the second conveying section 62 in the direction along the Z axis. For the first humidifying section 65, a known humidifying device such as an ultrasonic type can be applied.

[0054] By humidifying the web W with the mist M, the function of the starch as a bonding material is promoted, thereby improving the strength of the sheet P3. In addition, since the web W is humidified from below, water droplets generated by the mist can be prevented from falling onto the web W. Moreover, since the humidification is performed from the side opposite to the contact surface between the conveyor belt and the web W, the adhesion of the web W to the conveyor belt can be reduced. The second conveyor unit 62 conveys the web W to the forming unit 70.

[0055] The forming section 70 includes process rollers 71 and 72. The process rollers 71 and 72 process the web W contained in the fibers to form a strip-shaped sheet P1. The process rollers 71 and 72 form a pair, and each of the process rollers 71 and 72 has an internal electric heater to increase the temperature of the roller surface.

[0056] The processing rollers 71 and 72 are respectively substantially cylindrical members. The rotation axes of the processing rollers 71 and 72 are arranged along the X-axis. The processing rollers 71 are arranged substantially above the conveying path of the web W, and the processing rollers 72 are arranged substantially below the conveying path of the web W. Between the side surfaces of the processing rollers 71 and 72, a gap corresponding to the thickness of the sheet P3 to be manufactured is arranged.

[0057] The processing rollers 71 and 72 are driven to rotate by a stepping motor (not shown). The web W is sandwiched between the processing rollers 71 and 72 and is sent downstream while being heated and pressurized. That is, the web W continuously passes through the forming section 70, and is press-formed while being heated. By using the processing rollers 71 and 72 as a pair of forming members, the web W can be efficiently heated and pressurized.

[0058] The web W passes through the forming unit 70, whereby the air contained therein is reduced from a soft state containing a lot of air, and the fibers are bonded to each other by the bonding material to be formed into a strip-shaped sheet P1. The strip-shaped sheet P1 is conveyed to the first unit group 101 by conveying rollers (not shown).

[0059] The second humidifying unit 66 is disposed below the first humidifying unit 65. A known vaporization humidifying device can be applied to the second humidifying unit 66. Examples of the vaporization humidifying device include a humidifying device that generates humidified air by blowing air toward a wetted nonwoven fabric or the like to vaporize the water.

[0060] The second humidifying unit 66 humidifies a predetermined area of ​​the sheet manufacturing apparatus 1. The predetermined area refers to one or more of the buffer box 13, the separation unit 32, and the drum member 53 of the stacking unit 50. Specifically, humidified air is supplied to the above-mentioned area from the second humidifying unit 66 via a plurality of tubes (not shown). The humidified air suppresses the charging of the paper sheet C or fibers in the above-mentioned structures, thereby suppressing the adhesion of these substances to the components due to static electricity.

[0061] The drain unit 68 is a drain tank. The drain unit 68 is used in the first humidifying unit 65 and the second humidifying unit 66, etc., and collects and stores old water. The drain unit 68 can be removed from the sheet manufacturing apparatus 1 as needed to discard the accumulated water.

[0062] The strip-shaped sheet P1 conveyed to the first unit group 101 arrives at the first cutting unit 81. The first cutting unit 81 cuts the strip-shaped sheet P1 in a direction intersecting the conveying direction, for example, in a direction along the X axis. The strip-shaped sheet P1 is cut into single sheets P2 by the first cutting unit 81. The single sheets P2 are conveyed from the first cutting unit 81 to the second cutting unit 82.

[0063] The second cutting unit 82 cuts the single sheet P2 in the conveying direction, for example, in the direction along the Y axis. Specifically, the second cutting unit 82 cuts the single sheet P2 near the sides along the X axis. Thus, the single sheet P2 becomes a sheet P3 of a predetermined shape, such as A4 size or A3 size.

[0064] When the single sheet P2 is cut into sheets P3 by the second cutting unit 82, cut pieces S are generated as end materials. The cut pieces S are transported in the substantially -Y direction and reach the shredder 95 as a shredder. The shredder 95 shreds the cut pieces S into cut pieces and supplies them to the merging unit 17. Between the shredder 95 and the merging unit 17, a mechanism for measuring the cut pieces of the cut pieces S and supplying them to the merging unit 17 may be provided.

[0065] The sheet P3 is conveyed substantially upward and accumulated on the tray 91. As described above, the sheet P3 is manufactured by the sheet manufacturing apparatus 1. The sheet P3 can be used as a substitute for copy paper or the like, for example.

[0066] like Figure 2 As shown, the measuring unit 15 includes a measuring unit 15a and a measuring unit 15b. In the measuring unit 15, the measuring unit 15a and the measuring unit 15b are operated at different times to perform batch processing for measuring and supplying the paper sheets C. The supply of the paper tray C from the measuring unit 15 to the confluence unit 17 is intermittently implemented. As a result, the efficiency of measuring and supplying the paper sheets C can be improved.

[0067] The discharge pipe 14 further includes discharge pipes 14a and 14b corresponding to the measuring parts 15a and 15b. The discharge pipe 14a supplies the paper sheet C to the measuring part 15a, and the discharge pipe 14b supplies the paper sheet C to the measuring part 15b. The measuring part 15a is arranged below the end in the -X direction with respect to the discharge pipe 14a. The measuring part 15b is arranged below the end in the -X direction with respect to the discharge pipe 14b.

[0068] exist Figure 2 , as described below Figure 5 , Figure 7 as well as Figure 8In FIG. 1 , the arrows indicate the directions in which the paper sheets C move. The paper sheets C are introduced from the buffer box 13 to the measuring units 15a and 15b through the discharge pipes 14a and 14b by gravity.

[0069] The measuring unit 15a includes a paper barrel 151a, a cover 152a, a sensor 153a, a second frame 154a, and a baffle 155a. The measuring unit 15b includes a paper barrel 151b, a cover 152b, a sensor 153b, a second frame 154b, and a baffle 155b. Figure 2 , the state in which both the cover parts 152a and 152b are closed is shown. The measuring unit 15 has a first frame part 101F, and the above-mentioned parts constituting the measuring unit 15a and the measuring unit 15b are supported by the first frame part 101F. In addition, the first frame part 101F can also be regarded as a part of the measuring unit 15a. Similarly, the first frame part 101F can also be regarded as a part of the measuring unit 15b.

[0070] like Figure 3 As shown, the first frame portion 101F is composed of a sheet metal frame Fa formed of a metal plate and a resin frame Fb made of resin. The resin frame Fb is a frame body that penetrates in the up-down direction and is formed in a substantially rectangular parallelepiped shape. The resin frame Fb is a rectangular shape with a long side along the Y axis and a short side along the X axis when viewed from the +Z direction.

[0071] The sheet metal frame Fa is in a U-shape when viewed from the +Z direction, and includes a base Fa0 extending along the Y axis, an extension Fa1 extending from the end of the base Fa0 on the -Y side to the -X direction, and an extension Fa2 extending from the end of the base Fa0 on the +Y side to the -X direction. The end of the base Fa0 on the +X side, the end of the extension Fa1 on the -Y side, and the end of the extension Fa2 on the +Y side are bent in the -Z direction.

[0072] The sheet metal frame Fa is arranged on the upper surface of the resin frame Fb in a manner covering a portion of the resin frame Fb. The sheet metal frame Fa and the resin frame Fb are fixed by a plurality of connecting parts not shown in the figure, such as bolts. A through hole Fc penetrating in the up-down direction is formed on the first frame portion 101F constituted by the sheet metal frame Fa and the resin frame Fb. In addition, a protrusion Fa31 is formed on the extension portion Fa1 of the sheet metal frame Fa, which protrudes in the +Y direction toward the through hole Fc. In addition, a protrusion Fa32 is formed on the extension portion Fa2 of the sheet metal frame Fa, which protrudes in the -Y direction toward the through hole Fc. The positions where the protrusions Fa31 and Fa32 are provided are closer to the top end side, that is, the -X side, than the center of the extension direction of the extension portions Fa1 and Fa2.

[0073] like Figure 4 As shown, in the through hole Fc of the first frame portion 101F, the second frame portions 154a and 154b are arranged along the Y axis. Specifically, the second frame portion 154a is arranged on the -Y side of the through hole Fc, and the second frame portion 154b is arranged on the +Y side of the through hole Fc. The second frame portions 154a and 154b are components formed into a frame shape by four side wall portions, and have a storage portion 154c that penetrates in the up-down direction. The second frame portions 154a and 154b are components different from the first frame portion 101F. In other words, the second frame portions 154a and 154b are distinguished from the first frame portion 101F.

[0074] The second frame portions 154a and 154b are connected to the sheet metal frame Fa at positions separated from each other. Specifically, the second frame portion 154a arranged on the -Y side is fixed to the extension portion Fa1 by a coupling component B10 in the side wall portion located on the -Y side. On the other hand, the second frame portion 154b arranged on the +Y side is fixed to the extension portion Fa2 by a coupling component not shown in the figure in the side wall portion located on the +Y side. Here, the second frame portion 154a is fixed near the end of the -Y side of the extension portion Fa1 bent in the -Z direction. Similarly, the second frame portion 154b is fixed near the end of the +Y side of the extension portion Fa2 bent in the -Z direction.

[0075] Furthermore, the second frame portions 154a and 154b are supported by the resin frame Fb via the plate member 157 at positions close to each other. Specifically, the second frame portion 154a arranged on the -Y side is supported by the resin frame Fb via the plate member 157 in the portion on the +Y side of the side wall portion located on the -X side. On the other hand, the second frame portion 154b arranged on the +Y side is supported by the resin frame Fb via the plate member 157 in the portion on the -Y side of the side wall portion located on the -X side. Figure 4 Although not shown in the figure, the second frame portion 154a is also supported by the resin frame Fb via the plate member 157 in the portion on the +Y side of the side wall portion located on the +X side. Similarly, the second frame portion 154b is also supported by the resin frame Fb via the plate member 157 in the portion on the -Y side of the side wall portion located on the +X side. The peripheral structure of the plate member 157 will be described later.

[0076] Here, the measuring unit 15a and the measuring unit 15b are composed of the same structure. These structures are arranged in a plane-symmetrical manner with respect to the surface along the XZ plane at the middle of the measuring unit 15a and the measuring unit 15b. Each structure of the measuring unit 15a has the same mode and the same function as the corresponding structures of the measuring unit 15b. In the following description, the measuring unit 15a is described as a representative example of the measuring unit 15, and the description of the measuring unit 15b is omitted.

[0077] like Figure 4 as well as Figure 5 As shown, the paper barrel portion 151a is a cylindrical shape with a substantially rectangular cross section along the XY plane. The top of the paper barrel portion 151a is open and communicates with the space facing the end of the discharge pipe 14a in the -X direction. The paper sheet C is introduced from the discharge pipe 14a to the inside of the paper barrel portion 151a. A cover portion 152a is arranged below the paper barrel portion 151a.

[0078] The paper barrel 151a is substantially box-shaped and has a cavity inside. The paper barrel 151a and the cover 152a are housed inside the second frame 154a, that is, in the housing 154c of the second frame 154a. However, the paper barrel 151a and the cover 152a are not connected to the second frame 154a.

[0079] Back to Figure 2 The cover 152a is supported relative to the paper barrel portion 151a in an openable and closable manner. The cover 152a is a roughly plate-shaped and roughly rectangular member. The cover 152a is forced in a closed manner by a force-applying member not shown. When the cover 152a is closed, the bottom of the paper barrel portion 151a is in close contact with the cover 152a. In the closed state, the cover 152a is in a posture that is roughly along the XY plane and slightly inclined downward as it tends to the +Y direction. In this state, the cover 152a holds the paper sheet C in a manner that prevents it from falling.

[0080] The cover 152a is closed when a paper sheet C is placed on it. The paper sheet C is placed on the cover 152a in the closed state. The mass of the paper sheet C placed on the cover 152a is measured by the sensor 153a. The cover 152a and the opening and closing mechanism 160 (see Fig. 9 ) are connected.

[0081] like Figure 6As shown, the paper barrel part 151a is supported by the sheet metal frame Fa of the first frame part 101F via the sensor part 153a in the storage part 154c of the second frame part 154a. The sensor part 153a of this embodiment is a beam-type load sensor having a plurality of strain gauges not shown. The sensor part 153a measures the mass of the paper sheet C placed on the cover part 152a. The sensor part 153a is a roughly rectangular parallelepiped and is arranged in a manner that the length direction is along the X axis. The sensor part 153a is mounted on the first frame part 101F. Specifically, the sensor part 153a is fixed to the protrusion Fa31 of the sheet metal frame Fa on the lower surface of the end on the -X side by a coupling component not shown. On the other hand, the lower surface of the end on the +X side of the sensor part 153a does not contact other components. That is, the sensor part 153a is a cantilever beam with the end on the -X side as a fixed end and the end on the +X side as a free end.

[0082] The paper barrel portion 151a is fixed to the free end of the sensor portion 153a, that is, the upper surface of the end portion on the +X side, at the end portion on the +X side, through the coupling component B11. Therefore, the mass of the paper barrel portion 151a, the mass of the cover portion 152a, and the mass of the paper sheet C placed on the cover portion 152a are applied to the end portion on the +X side of the sensor portion 153a. The sensor portion 153a is strained by these masses. The sensor portion 153a outputs an output signal corresponding to the strain to the control portion 5. The control portion 5 can detect the mass of the paper sheet C by offsetting the mass of the paper barrel portion 151a and the mass of the cover portion 152a, which are known information. In addition, the sensor portions 153a and 153b are not limited to the above-mentioned load sensors, and can also be other detection units.

[0083] When the mass of the paper sheets C placed on the cover 152a reaches a predetermined amount, the control unit 5 operates the opening and closing mechanism 160 to open the cover 152a. The predetermined amount is, for example, several grams to several tens of grams.

[0084] The baffle portion 155a is disposed below the cover portion 152a. The baffle portion 155a is mounted on the second frame portion 154a. Specifically, the baffle portion 155a is rotatably supported by the second frame portion 154a. The baffle portion 155a can be opened and closed relative to the storage portion 154c of the second frame portion 154a. Figure 2 The state in which the shutter parts 155a and 155b are closed is shown.

[0085] The baffle 155a is a substantially plate-shaped and substantially rectangular member. When the baffle 155a is closed, the lower side of the second frame 154a is in close contact with the baffle 155a. The baffle 155a is supported by a spring member 175 (see Fig. 9 ) and is urged to close. In the closed state, the baffle portion 155a is in a posture that is substantially along the XY plane and slightly inclined downward as it approaches the +Y direction.

[0086] When the baffle 155a is closed, the space in the downstream confluence section 17 is cut off from the storage section 154c of the second frame section 154a. That is, the baffle 155a can block the space between the paper barrel section 151a and the cover 152a stored in the storage section 154c of the second frame section 154a and the confluence section 17 on the downstream side. An airflow toward the downstream defibrination section 31 is generated in the confluence section 17. Therefore, by cutting off the cover 152a from the inside of the confluence section 17, the influence of the airflow on the cover 152a and the sensor section 153a can be eliminated, and the measurement accuracy of the mass of the paper sheet C in the sensor section 153a can be improved.

[0087] like Figure 7 as well as Figure 8 As shown, the cover 152a and the shutter 155a are opened by moving the ends in the +Y direction downward with the ends in the -Y direction as fulcrums. The cover 152a and the shutter 155a are opened when the paper sheet C is conveyed downstream.

[0088] The cover 152a is opened and closed by the opening and closing mechanism 160 described later. The baffle 155a is pressed downward by the opened cover 152a, and is opened in conjunction with the opening of the cover 152a. Although the baffle 155a is urged to be closed by the spring member 175 as described above, the force of the cover 152a opening downward is greater than the force of the spring member 175, and therefore, the cover 152a and the opening and closing mechanism 160 overcome the above-mentioned force and open the baffle 155a.

[0089] When the cover 152a and the baffle 155a are opened, the paper pieces C placed on the cover 152a and whose mass has been measured are released to the junction 17. The cover 152a is opened when conveying the paper pieces C to the junction 17, and conveys the weighed paper pieces C to the junction 17. The paper pieces C fall from the cover 152a to the junction 17 below due to gravity, and are conveyed downstream by the airflow caused by the defibrating unit 31.

[0090] The cover 152a is opened for a fixed period and is closed after conveying the paper sheet C downstream. This operation is operated by the opening and closing mechanism 160. When the cover 152a is closed, the shutter 155a is closed by the urging force of the spring member 175 in conjunction with the closing operation of the cover 152a.

[0091] As described above, the opening and closing of the cover 152a is linked to the opening and closing of the baffle 155a. Thus, while the cover 152a is closed and the sensor 153a is measuring the paper sheet C, the baffle 155a is closed to block the cover 152a and the confluence 17. Therefore, when the sensor 153a is measuring, the influence of the above-mentioned airflow on the sensor 153a will be eliminated. In addition, since the measuring section 15a and the measuring section 15b are operated at different times, the cover 152a and the baffle 155a and the cover 152b and the baffle 155b will not be opened at the same time. That is, when the cover 152a is in the open state, the cover 152b is in the closed state, and the paper sheet C to be measured is placed on the cover 152b. When the cover 152b is in the open state, the cover 152a is in the closed state, and the paper sheet C to be measured is placed on the cover 152a. In other words, the measuring unit 15a and the measuring unit 15b measure the paper sheet C at different timings.

[0092] like Fig. 9 As shown in FIG. 1 , the measuring unit 15a has an opening and closing mechanism 160 for opening and closing the cover 152a. Although not shown in the figure, the measuring unit 15b also has an opening and closing mechanism for opening and closing the cover 152b. The opening and closing mechanism for opening and closing the cover 152b has the same structure and function as the opening and closing mechanism 160 of the cover 152a. Therefore, the opening and closing mechanism 160 is used as a representative example for explanation.

[0093] The opening and closing mechanism 160 includes a driving shaft 161, a cam member 163, a pin member 165, a force applying member (not shown), and a driving motor. When the sensor unit 153a described above detects that the paper sheets C placed on the cover 152a reach a predetermined amount, the detection result becomes a trigger to operate the opening and closing mechanism 160. The opening and closing mechanism 160 opens the cover 152a by driving the motor to send the paper sheets C downstream.

[0094] The cam member 163 is substantially fan-shaped when viewed from the +X direction. The portion of the cam member 163 corresponding to the center of the original circle is attached to the drive shaft 161 .

[0095] When the opening and closing mechanism 160 is operated, the drive shaft 161 is rotated counterclockwise by the drive motor when viewed from the +X direction, and thus the cam member 163 is also rotated counterclockwise. The cam member 163 rotates so that a portion corresponding to the radius of the sector abuts against the pin member 165 .

[0096] The pin member 165 is connected to the cover 152a via a stay not shown. When the pin member 165 contacts the cam member 163, the pin member 165 is pressed counterclockwise when viewed from the +X direction. The driving force of the drive motor is larger than the force of the force member not shown for closing the cover 152a. Therefore, the cover 152a is opened by the driving force of the drive motor.

[0097] Even while the cover 152a is open, the cam member 163 continues to rotate. As a result, the point of contact between the pin member 165 and the cam member 163 moves from a portion corresponding to the radius of the sector of the cam member 163 to a portion corresponding to the arc of the sector. Since the pin member 165 abuts along the arc, the cover 152a is not closed instantaneously but gradually.

[0098] Since the cover 152a is gradually closed, the generation of vibration or impact can be suppressed when the cover 152a is closed. The time when the cover 152a is opened, the time when the cover 152a is gradually closed, and the time when the cover 152a is completely closed are specified according to the shape of the cam member 163 and the rotation speed per hour.

[0099] The baffle portion 155a described above is mounted on the support member 173. The support member 173 is connected to the support shaft 171 and can rotate with the support shaft 171 as a fulcrum. The support shaft 171 is supported by the second frame portion 154a. One end of the spring member 175 is mounted in the support member 173 in a region above the support shaft 171. The other end of the spring member 175 is mounted on the sheet metal frame Fa of the first frame portion 101F.

[0100] The spring member 175 urges the upper region in the -Y direction. Therefore, in the support member 173, the region below the support shaft 171 is urged in the substantially +Y direction. Thus, the baffle portion 155a is urged to close relative to the second frame portion 154a.

[0101] The force of the spring member 175 is smaller than the force of the cover 152a to open. Therefore, when the cover 152a is opened, the baffle 155a pressed by the cover 152a will also open. When the cover 152a is closed, the baffle 155a gradually closes while the cover 152a and the baffle 155a are in contact.

[0102] As described above, the second frame parts 154a and 154b are connected to the resin frame Fb of the first frame part 101F via the plate member 157 at positions close to each other. Fig.10As shown, in addition to the plate member 157 , a vibration absorbing portion 156 is disposed between the first frame portion 101F and the second frame portion 154 a and between the first frame portion 101F and the second frame portion 154 b .

[0103] The structure and function of the vibration absorbing portion 156 are the same between the first frame portion 101F and the second frame portion 154a and between the first frame portion 101F and the second frame portion 154b. Therefore, in the following description, the structure between the first frame portion 101F and the second frame portion 154a is described as a representative example.

[0104] Although the details will be described later, the vibration absorbing portion 156 will mitigate the vibration or impact generated by the contact between the second frame portion 154a and the baffle portion 155a when the above-mentioned baffle portion 155a is closed, thereby suppressing the transmission of vibration or impact from the second frame portion 154a to the first frame portion 101F.

[0105] The plate member 157 is a substantially rectangular plate-shaped member, and is formed of, for example, resin, etc. The main surface of the plate member 157 is along the XY plane, and the long side is arranged along the Y axis. When viewed from above, two coupling members B1 and two coupling members B2 are arranged at the four corners of the plate member 157.

[0106] The coupling parts B1 and B2 are bolts. The first frame part 101F and the second frame part 154a corresponding to the coupling parts B1 and B2 are provided with internal threads that are screwed with the coupling parts B1 and B2. The coupling part B2 is arranged along the Y axis and directly couples the first frame part 101F and the plate part 157.

[0107] like Fig.11 As shown, the vibration absorbing part 156 is arranged between the second frame part 154a and the plate part 157. The coupling part B1 is screwed with the second frame part 154a. In detail, in the second frame part 154a, the area screwed with the coupling part B1 is set to a shape with a large volume at the top. The vibration absorbing part 156 is roughly annular and is arranged in a manner to surround the above-mentioned large volume area of ​​the second frame part 154a. The plate part 157 is embedded and installed in a recess roughly in the middle of the vibration absorbing part 156 in the up and down direction.

[0108] The coupling member B1 is screwed with the second frame portion 154a, so that the head portion presses the vibration absorbing portion 156 downward. Thus, the vibration absorbing portion 156 and the second frame portion 154a are positioned via the coupling member B1. Furthermore, the vibration absorbing portion 156 contracts by being pressed downward, thereby fixing the plate member 157 embedded in the above-mentioned recess.

[0109] According to the above, the vibration absorbing part 156 is arranged between the second frame part 154a and the plate member 157, and is interposed between the second frame part 154a and the first frame part 101F. The vibration absorbing part 156 has a function of absorbing and damping vibration or impact. The vibration absorbing part 156 is formed of an elastic material such as rubber.

[0110] Since the shutter parts 155a and 155b are closed by the force of the spring member 175, they come into contact with the second frame parts 154a and 154b and are closed with a certain degree of force. The vibration or impact generated when the shutter parts 155a and 155b are closed is transmitted to the sensor parts 153a and 153b via the second frame parts 154a and 154b, which may affect the measurement of the paper sheets C.

[0111] Here, the measurement of the paper pieces C by the measuring unit 15a starts after the cover 152a of the measuring unit 15a is closed. That is, the measurement of the paper pieces C has not started at the moment when the cover 152a and the baffle 155a are closed. Therefore, there is no need to consider the influence of the vibration or impact generated by the second frame 154a when the baffle 155a is closed on the sensor 153a. However, it is assumed that the measurement of the paper pieces C is being carried out in another measuring unit 15b at the moment when the baffle 155a is closed. Therefore, the vibration or impact generated when the baffle 155a of the measuring unit 15a is closed may affect the sensor 153b of the measuring unit 15b. Similarly, the vibration or impact generated when the baffle 155b of the measuring unit 15b is closed may affect the sensor 153a of the measuring unit 15a.

[0112] The vibration absorbing portion 156 suppresses the transmission of the above-mentioned vibration or shock from the second frame portion 154a to the first frame portion 101F. As a result, the vibration or the like generated by the second frame portion 154a and the baffle portion 155a becomes difficult to be transmitted from the second frame portion 154a to the sensor portion 153b via the first frame portion 101F. Similarly, the vibration or the like generated by the second frame portion 154b and the baffle portion 155b becomes difficult to be transmitted from the second frame portion 154b to the sensor portion 153a via the first frame portion 101F. According to the above manner, the vibration or shock transmitted to the sensor portions 153a and 153b can be further reduced, thereby further improving the measurement accuracy of the mass of the paper sheet C in the sensor portions 153a and 153b.

[0113] On the other hand, Figure 4As shown, the second frame parts 154a and 154b are directly screwed to the sheet metal frame Fa at positions separated from each other. Specifically, one second frame part 154a is fixed to the extension part Fa1 of the sheet metal frame Fa, and the other second frame part 154b is fixed to the extension part Fa2 opposite to the extension part Fa1. Therefore, the vibration or impact generated by the second frame parts 154a and 154b is directly transmitted to the first frame part 101F at the position where they are screwed. However, the vibration or impact generated by the second frame part 154a of the measuring part 15a is transmitted to the sensor part 153b of the measuring part 15b via the extension part Fa1, the base part Fa0, the extension part Fa2 and the protrusion Fa32. Similarly, the vibration or impact generated by the second frame part 154b of the measuring part 15b is transmitted to the sensor part 153a of the measuring part 15a via the extension part Fa2, the base part Fa0, the extension part Fa1 and the protrusion Fa31. That is, since the second frame parts 154a, 154b and the first frame part 101F are fixed at the extension parts Fa1, Fa2 of the sheet metal frame Fa, the path for vibration or impact transmission becomes longer. As a result, the influence of vibration or impact on the sensor parts 153a, 153b is reduced. Moreover, since the sensor parts 153a, 153b and the sheet metal frame Fa of the first frame part 101F are fixed at the top end side of the extension parts Fa1, Fa2, that is, the -X side, the path for vibration or impact transmission becomes longer than the case of the +X side.

[0114] In addition, the position where the second frame portion 154a is connected to the sheet metal frame Fa of the first frame portion 101F is near the end of the -Y side of the extension portion Fa1 that is bent in the -Z direction. In addition, the position where the second frame portion 154b is connected to the sheet metal frame Fa of the first frame portion 101F is near the end of the +Y side of the extension portion Fa2 that is bent in the -Z direction. The vicinity of the bent portion has higher rigidity than other portions. In other words, the second frame portions 154a, 154b and the first frame portion 101F are connected together at a position with higher rigidity. As a result, the vibration or impact transmitted from the second frame portions 154a, 154b to the first frame portion 101F can be further reduced.

[0115] In addition, although the paper barrel parts 151a and 151b may vibrate or impact when the cover parts 152a and 152b are closed, the cover parts 152a and 152b are smaller and lighter than the baffle parts 155a and 155b, so the influence is small. In addition, the vibration or impact generated by the paper barrel part 151a is transmitted to the sensor part 153b of the measuring part 15b via the sensor part 153a, the protruding part Fa31, the extension part Fa1, the base part Fa0, the extension part Fa2, and the protruding part Fa32. Similarly, the vibration or impact generated by the paper barrel part 151b is transmitted to the sensor part 153a of the measuring part 15a via the sensor part 153b, the protruding part Fa32, the extension part Fa2, the base part Fa0, the extension part Fa1, and the protruding part Fa31. That is, the path of the vibration or impact generated by closing the cover parts 152a and 152b is longer than the path of the vibration or impact generated by closing the baffle parts 155a and 155b. Therefore, the vibration or impact generated by closing the cover parts 152a and 152b has a small impact on the sensor parts 153a and 153b.

[0116] According to this embodiment, the following effects can be obtained.

[0117] The measurement accuracy of the mass of the paper sheet C can be improved. Specifically, the sensor parts 153a and 153b are mounted on the first frame part 101F, the baffle part 155a is mounted on the second frame part 154a, and the baffle part 155b is mounted on the second frame part 154b. As a result, vibrations and the like generated by the opening and closing of the baffle parts 155a and 155b are difficult to be transmitted to the sensor parts 153a and 153b. In addition, the baffle parts 155a and 155b block the cover parts 152a and 152b to protect them from the airflow in which the paper sheet C is transported. Therefore, the influence of the airflow on the cover parts 152a and 152b is eliminated. Therefore, it is possible to provide a sheet manufacturing device 1 that improves the measurement accuracy of the paper sheet C.

[0118] In the above-mentioned embodiment, the measuring section 15a is equivalent to the first measuring section, and the measuring section 15b is equivalent to the second measuring section. In addition, the cover section 152a is equivalent to the first cover section, and the cover section 152b is equivalent to the second cover section. In addition, the sensor section 153a is equivalent to the first sensor section, and the sensor section 153b is equivalent to the second sensor section. In addition, the baffle section 155a is equivalent to the first baffle section, and the baffle section 155b is equivalent to the second baffle section. In addition, the second frame section 154b of the measuring section 15b is equivalent to the fourth frame section.

[0119] In addition, although the above-mentioned embodiment shows a structure in which both the measuring unit 15a and the measuring unit 15b are supported by the common first frame portion 101F, the present invention is not limited to this structure. For example, the measuring unit 15a may be supported by the first frame portion 101F, and the measuring unit 15b may be supported by a third frame portion different from the first frame portion 101F. In other words, the third frame portion supporting the measuring unit 15b may be the same as or different from the first frame portion 101F. In the case where the third frame portion is different from the first frame portion 101F, vibration or impact becomes more difficult to transmit.

[0120] In addition, the measuring unit is not limited to two, and may be three or more. When there are three or more measuring units, it is desirable to stagger the measuring timing and perform the measurement at equal intervals. In this case, the influence of vibration or impact from other measuring units can be suppressed. However, it is not limited to this. In addition, the measuring unit may be only one, and even in this case, the situation in which the vibration or impact from its own baffle portion remains and affects the measurement can be suppressed.

[0121] Explanation of symbols

[0122] 1…sheet manufacturing device; 15, 15a, 15b…measuring section; 101F…first frame section; 152a, 152b…cover section; 153a, 153b…sensor section; 154a, 154b…second frame section; 154c…storage section; 155a, 155b…baffle section; 156…vibration absorbing section; 160…opening and closing mechanism; 175…spring member; C…paper sheet; Fa…sheet metal frame; Fa0…base; Fa1, Fa2…extension section; Fa31, Fa32…protrusion; Fb…resin frame; FC…through hole.

Claims

1. A sheet manufacturing device, characterized in that: A first measuring unit is provided, wherein the first measuring unit measures the paper sheet. The first measuring unit comprises: The first frame part; a second frame portion that is distinguished from the first frame portion; A first cover portion, on which paper sheets to be measured are placed in a closed state, and which, in an open state, conveys the measured paper sheets to a downstream conveying pipe; a first sensor unit for measuring the mass of the paper sheet placed on the first cover; a first baffle portion, which can seal between the first cover portion and the delivery pipe, The first sensor portion is mounted on the first frame portion, The first baffle portion is mounted on the second frame portion.

2. The sheet manufacturing device according to claim 1, wherein: A vibration absorbing portion is arranged between the first frame portion and the second frame portion.

3. The sheet manufacturing device according to claim 1, wherein: The first cover is closed when paper sheets are placed thereon, and is opened when the paper sheets are conveyed to the conveying tube. The first shutter portion opens in conjunction with an opening movement of the first cover portion.

4. The sheet manufacturing device according to claim 3, characterized in that: The first shutter portion is closed by the urging force of a spring member in conjunction with a closing operation of the first cover portion.

5. The sheet manufacturing device according to claim 4, characterized in that: The first measuring section includes an opening and closing mechanism for opening and closing the first cover.

6. The sheet manufacturing device according to claim 1, wherein: Different from the first measuring unit, there is also a second measuring unit for measuring the paper sheets. The second measuring unit includes: The third framework department; a fourth frame portion, which is distinguished from the third frame portion; a second cover, on which paper sheets to be measured are placed when in a closed state, and which conveys the measured paper sheets to the conveying pipe when in an open state; a second sensor unit for measuring the mass of the paper sheet placed on the second cover unit; A second baffle portion, which can seal between the second cover portion and the delivery pipe, The second sensor portion is mounted on the third frame portion, The second baffle portion is mounted on the fourth frame portion.

7. The sheet manufacturing device according to claim 6, characterized in that: The first measuring unit and the second measuring unit measure the paper sheets at different timings.

8. The sheet manufacturing device according to claim 7, characterized in that: When the first cover is in an open state, the second cover is in a closed state, and a paper sheet to be measured is placed on the second cover. When the second cover is in the open state, the first cover is in the closed state, and paper sheets to be weighed are placed on the first cover.

9. The sheet manufacturing device according to claim 6, characterized in that: The first frame portion and the third frame portion are identical.

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