Corner roll mechanism

Abstract

To provide a corner roll mechanism for a paper machine in a paper machine for manufacturing a sheet, capable of reducing occurrence of wrinkles by changing diameters of a corner roll freely.SOLUTION: In a paper machine assembled with at least a preparation part, a wire part, a press part, a dry part, a calendar part, and a reel part, to change a transportation angle of a sheet in a process of transportation of a sheet from the press part to the reel part, several small diameter rolls arranged parallel to each other are fixed at both ends by a small diameter roll fitting plate having grooves cut radially from its center, and the corner roll mechanism can be changed in the grooves by using an expansion and contraction of springs at a desired small diameter roll position.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a corner roll disposed in a paper transport path in a paper machine that produces paper. [Background technology]

[0002] First, as an example, the papermaking process in a Fourdrinier paper machine (M) is shown in Figure 1. The Fourdrinier paper machine (M) is roughly divided into a preparation section (1), a wire section (2), a press section (3), a drying section (4), a calendar section (5), and a reel section (6).

[0003] The preparation section (1) removes large foreign matter such as tangles or clumps from the sheet (P), which is the raw material of paper and is a solution in which fibers forming the paper layer are dispersed in water, and disperses the fibers.

[0004] For the wire section (2), the sheet (P) supplied from the preparation section (1) is supplied onto the upper surface of the wire (2a), and then the basis weight balance and fiber dispersion in the width direction of the wire (2a) are promoted to form a wet sheet (P).

[0005] The press section (3) applies pressure to the sheet (P) to dehydrate it.

[0006] The drying section (4) dries the dehydrated sheet (P) and also adjusts the expansion and contraction of the paper.

[0007] In the calendering section (5), the sheet is passed through calender rolls (5a) and pressure is applied to smooth the surface of the dried sheet and adjust the thickness of the sheet.

[0008] The reel section (6) winds up the completed sheet (P) and sends it to the next process.

[0009] In the Fourdrinier paper machine (M), the conveying direction of the sheet (P) is changed by corner rolls (8), but some of the corner rolls (8) exist at corner rolls (8) where the conveying direction of the sheet (P) changes suddenly.

[0010] The sheet (P) is susceptible to wrinkling due to the large force acting on it at the corner rolls (8) where the sheet (P) conveyance direction changes suddenly (see Figure 2). When wrinkles occur, the wrinkles in the sheet (P) are smoothed out by adjusting the tension of the sheet (P) in the Fourdrinier paper machine (M), but this is only a temporary solution, and the wrinkles recur if the papermaking conditions change.

[0011] The strip-shaped sheet (P) immediately after the wire section (2) of the Fourdrinier paper machine (M) is in a wet state and will break with even the slightest force. However, it subsequently dries in the drying section (4) and other sections, and by the reel section (6) where the strip-shaped sheet (P) is wound up, it has become a sheet (P) with sufficient strength.

[0012] In such a papermaking machine, the sheet (P) may tear or wrinkle in areas where the moisture content of the sheet (P) is high and the strength of the sheet (P) is insufficient. In particular, when the conveying direction of the sheet (P) is significantly changed by the corner rolls (8), the strip-shaped sheet (P) is subjected to a large amount of pressure, which may cause the sheet (P) to tear or wrinkle. For this reason, the pressure on the sheet (P) is reduced by reducing the angle at which the sheet (P) is held by the corner rolls (8) or by increasing the diameter of the corner rolls (8).

[0013] However, the space inside a paper machine is limited, and there are restrictions on the placement position and diameter of the corner rolls (8). Therefore, the diameter of the corner rolls (8) is determined based on past experience, but in a paper machine, wrinkles may occur in the sheet (P) at the corner rolls (8) due to daily changes in temperature and humidity and variations in the sheet (P).

[0014] Therefore, as an example of a method for preventing the occurrence of wrinkles in paper, a technology has been disclosed in which a conveying device conveys a web to the circumferential surface of a small diameter portion while supporting the web with a conveying roller, and by releasing air between the circumferential surface and the web being conveyed, the web can be conveyed so that the tension on the web on the circumferential surface of the large diameter portion is greater than the holding force on the web supported by the circumferential surface of the small diameter portion, thereby reliably preventing the occurrence of wrinkles and slippage (see, for example, Patent Document 1).

[0015] Another example of a method for preventing paper wrinkles is a storage device that receives the outer periphery of roll paper, and technology has been disclosed that solves problems such as paper shifting and folding of the edges of the paper by clamping the roll paper with a spring in the flange portion of the guide roller (see, for example, Patent Document 2).

[0016] However, it has been difficult to completely prevent wrinkles even with the techniques described in Patent Documents 1 and 2. While it has been known that changing corner rolls (8) to larger diameters is an effective method of preventing wrinkles when wrinkles occur in the corner rolls (8) using various countermeasures up to now, there is a problem in that the optimal diameter is unknown, and there has been a demand for corner rolls (8) whose diameter can be freely adjusted.

[0017] Therefore, as an example of a technology that can change the diameter of the corner roll (8), a technology has been disclosed in which a cylindrical body is formed by combining a first tapered member and a second tapered member that slide in the longitudinal direction, and the effective diameter of the cylindrical body can be changed by moving both tapered members toward or away from each other (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-043749 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-272787 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-040496 Summary of the Invention [Problem to be solved by the invention]

[0019] However, the technology described in Patent Document 3 has a complex structure, and when the tapered member is moved axially, the diameter of the corner roll increases, but the width decreases proportionally, resulting in an insufficient width for the sheet width.

[0020] The present invention aims to solve the above-mentioned problems and to provide a corner roll mechanism for a papermaking machine that produces sheets, in which the diameter of the corner roll can be freely adjusted to obtain an appropriate roll diameter and reduce the occurrence of wrinkles. [Means for solving the problem]

[0021] The present invention relates to a papermaking machine that includes at least a preparation section that disperses fibers, which are the raw material for the sheet, in water, a wire section that promotes the dispersion of the fibers and forms a wet sheet, a press section that applies pressure to the sheet to dehydrate it, a dryer section that dries the dehydrated sheet, a calendar section that smooths the surface of the sheet and adjusts the paper thickness, and a reel section that winds up the sheet. a small diameter roll mounting plate shaft for connecting the small diameter roll mounting plate to the paper machine; a small diameter roll position adjustment plate provided on the small diameter roll mounting plate adjacent to the small diameter roll on the opposite side of the spring with the small diameter roll sandwiched between them; and an adjustment screw located on the opposite side of the small diameter roll with the small diameter roll position adjustment plate sandwiched between them, the adjustment screw being driven by a motor to rotate and change the position of the small diameter roll position adjustment plate; the small diameter roll mounting plate has a plurality of grooves cut out radially from the small diameter roll mounting plate shaft, and the fixed position of the small diameter roll is changed by rotating the adjustment screw to change the position of the small diameter roll position adjustment plate, allowing the small diameter roll to be moved by expansion and contraction of the spring within the groove.

[0022] The small diameter roll mounting plate in the corner roll mechanism of the present invention is characterized in that it has a fan-like or circular shape, and a plurality of small diameter rolls are fixed in an arc shape around the small diameter roll mounting plate shaft of the small diameter roll mounting plate.

[0023] Furthermore, the small diameter roll in the corner roll mechanism of the present invention is characterized in that when the small diameter roll mounting plate has a circular shape, the small diameter roll mounting plate shaft is rotatably provided and rotates around the small diameter roll mounting plate shaft together with the small diameter roll mounting plate as the sheet is transported. [Effects of the Invention]

[0024] The present invention provides a mechanism that allows the diameter of the corner rolls in a paper machine to be changed online while the machine is in operation, thereby preventing wrinkles from occurring in the sheet. [Brief explanation of the drawings]

[0025] [Figure 1] Schematic diagram showing the entire Fourdrinier paper machine [Figure 2] A diagram showing how wrinkles occur when a sheet is conveyed in a paper machine. [Figure 3] FIG. 1 is a diagram showing a corner roll mechanism in the first embodiment. [Figure 4] FIG. 10 is a diagram illustrating a sheet conveying state by a corner roll mechanism according to the first embodiment. [Figure 5] FIG. 10 is a diagram showing a fluctuation state on a small diameter roll mounting plate in the first embodiment. [Figure 6] FIG. 1 is a diagram illustrating the state of a small diameter roll and a small diameter roll mounting plate. [Figure 7] Diagram showing the small diameter roll mounting plate [Figure 8] FIG. 10 is a diagram illustrating the fluctuation state of corner rolls in the first embodiment. [Figure 9] FIG. 10 is a diagram for explaining the fluctuation operation of a small diameter roll. [Figure 10] FIG. 10 is a diagram showing a corner roll mechanism in a second embodiment. [Figure 11] FIG. 10 is a diagram showing the difference in diameter of the corner rolls in the fluctuating state in the second embodiment. [Figure 12] FIG. 10 is a diagram illustrating the effect of the corner roll in the second embodiment. [Figure 13] FIG. 10 is a diagram illustrating a modification of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] Although the following describes a form for implementing the present invention, the present invention is not limited to this, and other embodiments are also included within the scope of the technical ideas described in the claims.

[0027] (First embodiment) The first embodiment of the present invention will be described. In the first embodiment, a mechanism is provided in which the small diameter rolls (9) required to change the conveying angle of the conveyed sheet (8) are fixed to a small diameter roll mounting plate.

[0028] Figure 1 is a schematic diagram showing the entire Fourdrinier paper machine (M). As shown in Figure 1, a typical Fourdrinier paper machine (M) consists of a preparation section (1), a wire section (2), a press section (3), a drying section (4), a calendar section (5), and a reel section (6), and the sheet (P) is produced by being conveyed along the rolls of each section in order.

[0029] In the conveying path of this sheet (P), there is a roll whose conveying angle changes to 90° or more, and this roll is the corner roll (8) that is the subject of the present invention. Note that the installation location of the corner roll (8) is not shown in Figure 1 because it varies depending on the specifications of the paper machine.

[0030] Next, the corner roll (8) in the first embodiment will be described with reference to Fig. 3. The corner roll (8) of the present invention is composed of a plurality of small diameter rolls (9), and therefore is a corner roll mechanism, unlike the conventional single corner roll (8). However, in this specification, the term "mechanism" will be omitted and the corner roll (8) will be described.

[0031] The corner roll (8) of the present invention is composed of a plurality of small diameter rolls (9) arranged in parallel, as shown in Fig. 3(b). This is to make the conveying angle of the conveyed sheet (P) gentler than when a single roll is arranged. Since it is only necessary to provide small diameter rolls (9) at the contact points with the conveyed sheet (P), the plurality of small diameter rolls (9) are arranged on an arc when viewed from the side (a), as shown in Fig. 3(a).

[0032] In order to arrange the small diameter roll (9) on the arc, small diameter roll mounting plates (10) are arranged on both ends of the small diameter roll (9) and sandwiched to form a cylindrical shape, which is called the corner roll (8). In the first embodiment, the small diameter roll mounting plates (10) have a fan-like shape with a part of a circle missing in order to arrange the small diameter roll (9) on the arc.

[0033] The small diameter roll mounting plate (10) is provided with grooves (12) in the same number as the small diameter rolls (9), and is shaped like a circle with a portion missing, providing a mechanism that allows the position of the small diameter rolls (9) to be varied along the grooves (12). The grooves (12) are formed by cutting out the grooves (12) radially and approximately rectangularly from the small diameter roll mounting plate shaft (11), which is the center of the fan-shaped small diameter roll mounting plate (10). Note that the term "approximately rectangular" does not only refer to a rectangle, but also includes shapes that can be regarded as the same as a rectangle, such as a shape with chamfered corners.

[0034] The small diameter roll (9) and the small diameter roll mounting plate (10) can be connected in the groove (12) by the small diameter roll mounting plate shaft (13) and the guide (14). Also, by fixing the small diameter roll mounting plate (10) to the paper machine by the small diameter roll mounting plate shaft (11), it can be installed as a corner roll (8) of the paper machine.

[0035] In the first embodiment, as shown in FIG. 3, an example in which four small diameter rolls (9) are installed has been described. However, the four small diameter rolls (9) are arranged at equal intervals. The number of small diameter rolls (9) to be arranged is not limited to this and may be appropriately set according to the size of the papermaking machine, the conveying path, and the like. However, if the number of small diameter rolls (9) is too large, the space between the small diameter rolls (9) becomes narrow. Therefore, when the mounting positions of the small diameter rolls (9) are moved radially inward, the small diameter rolls (9) come into contact with each other. Therefore, the number of small diameter rolls (9) to be arranged is appropriately determined depending on the fluctuation range of the diameter of the corner rolls (8). Conversely, if the number of small diameter rolls (9) to be arranged is too small, the conveying angle will change drastically, causing wrinkles in the sheet (P). Therefore, when the small diameter rolls (9) are arranged in a fan shape as shown in FIG. 3, it is preferable to install four to six small diameter rolls (9).

[0036] FIG. 4 is a side view and a front view showing the conveyance state of the sheet (P) on the corner rolls (8). As shown in FIG. 4(a), the multiple small diameter rolls (9) arranged on an arc when viewed from the side are all in contact with the sheet (P), and therefore all rotate as the sheet (P) is conveyed. In FIG. 4, the small diameter roll mounting plate (10) is omitted in order to explain the state of the small diameter rolls (9). As all of the multiple small diameter rolls (9) rotate in contact with the sheet (P), the sheet (P) is conveyed in the conveyance direction while smoothly changing direction, preventing the occurrence of wrinkles. Note that while the multiple small diameter rolls (9) rotate when the sheet (P) is being conveyed, the small diameter roll mounting plate (10), not shown, does not operate.

[0037] Fig. 5(a) is a side view of the corner roll (8) when the radial distance between the multiple small diameter rolls (9) and the small diameter roll mounting plate shaft (11) at the center of the fan-shaped small diameter roll mounting plate (10) is shortest, and Fig. 5(b) is a side view of the corner roll (8) when the radial distance between the multiple small diameter rolls (9) and the small diameter roll mounting plate shaft (11) at the center of the fan-shaped small diameter roll mounting plate (10) is longest. A feature of the present invention is that it is possible to move the multiple small diameter rolls (9) along the grooves (12) as a wrinkle reduction measure depending on the sheet conveyance state, from the state where the radial distance is shortest in Fig. 5(a) to the state where the radial distance is longest in Fig. 5(b).

[0038] In order to move the small diameter rolls (9) along the grooves (12), as shown in Fig. 5, springs (15) are provided from the small diameter roll mounting plate shaft (11) toward each groove (12), and the position of the small diameter rolls (9) can be changed by controlling the springs (15). The mechanism for moving the small diameter rolls (9) by the springs (15) will be described in detail later.

[0039] 6 is a schematic diagram for explaining the mounting state of the small diameter roll (9) and the small diameter roll mounting plate (10). The small diameter roll (9) passes through the groove (12) of the small diameter roll mounting plate (10) via the shaft (13), and can be fixed in the optimal position by being fixed from the outside with the guide (14).

[0040] FIG. 7 shows a side view and a front view of the small diameter roll mounting plate (10). As shown in FIG. 7(b), a small diameter roll mounting plate shaft (11) is provided at the center of the fan-shaped small diameter roll mounting plate (10), and approximately rectangular grooves (12) are provided radially penetrating from the small diameter roll mounting plate shaft (11). The width of the groove (12) is slightly larger than the diameter of the shaft (13) of the small diameter roll (9), and the length of the approximately rectangular groove can be appropriately formed depending on the desired range of diameter fluctuation of the corner roll (8). In this embodiment, the groove (12) extends radially outward from a position 25 mm away from the center of the small diameter roll mounting plate shaft (11), and its length is 35 mm. Furthermore, since the diameter of the shaft (13) is 10 mm, the variable length of the center of the small diameter roll (9) is 25 mm.

[0041] The number of grooves 12 formed in the small diameter roll mounting plate 10 should be equal to or greater than the number of small diameter rolls 9 to be installed, and it is not necessary to utilize all of the formed grooves 12; some grooves may be formed in advance. The intervals between the grooves 12 are preferably equal, but may be appropriately designed to match the installation positions of the small diameter rolls 9 so as to achieve the desired conveyance angle of the sheet P.

[0042] As shown in FIG. 7(a), the small diameter roll mounting plate (10) is integrated with the small diameter roll mounting plate shaft (11) and is connected to the paper machine by the small diameter roll mounting plate shaft (11).

[0043] Figure 8 is a schematic diagram showing the state of change in diameter of a corner roll (8) consisting of multiple small diameter rolls (9) in a corner roll mechanism of the present invention. Figure 8(a) shows a conventional corner roll (8), whose diameter is indicated as D. Figure 8(b) shows a corner roll (8) of the present invention in which multiple small diameter rolls (9) are arranged so that the diameter (D) is the same as the diameter (D) of the conventional corner roll (8). Figure 8(c) shows a corner roll consisting of multiple small diameter rolls (9) when the multiple small diameter rolls (9) are moved radially outward from the small diameter roll mounting plate shaft (11) at the center of the small diameter roll mounting plate (10) from the state shown in Figure 8(b), thereby increasing the diameter of the corner roll (8) to a larger diameter (D'). Therefore, the diameter (D) of the conventional corner roll (8) in Figure 8(a) is equal to the shortest diameter (D) of the corner roll (8) of the present invention in Figure 8(b), and the diameter (D') of the corner roll (8) of the present invention in Figure 8(c) is larger than that (D'>D).

[0044] Next, we will explain the mechanism for changing the position of the small diameter roll (9), which is a feature of the present invention. Figure 9 is a schematic diagram showing the state of movement of the small diameter roll (9). The components required to change the position of the small diameter roll (9) include at least a spring (15), a small diameter roll position adjustment plate (17), a motor (16), a guide (14), and an adjustment screw (9).

[0045] 9(a) shows the state in which the small diameter roll (9) is positioned under normal conditions by moving the small diameter roll position adjustment plate (17) using the motor (16). A spring (15) is provided between the small diameter roll mounting plate shaft (11) and a guide (14) that prevents the small diameter roll (9) from coming off the small diameter roll mounting plate (10). The spring is attached to the shaft (13) of the small diameter roll (9) that is attached to the small diameter roll mounting plate. A small diameter roll position adjustment plate (17) is provided adjacent to the guide (14) on the side opposite to the side where the spring (15) is provided. An adjustment screw (19) is further provided on the small diameter roll position adjustment plate (17) so that it can rotate when driven by the motor (16).

[0046] 9(a), in the normal state, the adjustment screw 19 is in its longest state and presses the small diameter roll position adjustment plate 17 toward the small diameter roll 9, so that the small diameter roll 9 presses the spring 15 toward the small diameter roll mounting plate shaft 11. In other words, the spring 15 is in its shortest, compressed state.

[0047] 9(b) shows a state in which the diameter of the small diameter roll (9) is increased by moving the small diameter roll position adjustment plate (17) outward from the shaft (13) of the small diameter roll (9) when wrinkles occur. To prevent wrinkles, the position of the small diameter roll (9) is moved outward from the small diameter roll mounting plate shaft (11). The motor (16) drives the adjustment screw (19) to rotate, pulling the small diameter roll position adjustment plate (17) toward the motor (16) (moving it outward from the small diameter roll mounting plate shaft (11)). This causes the shaft (13) to be pushed by the spring (15) and move within the groove (12). This is the state in which the spring (15) is stretched to its fullest extent.

[0048] As described above, by adopting the state shown in FIG. 9(b), it is possible to increase the diameter of the corner roll (8) as shown in FIG. 8(c) described above.

[0049] (Second embodiment) A second embodiment of the present invention will be described below. In the second embodiment, the small diameter roll mounting plate (10) has a circular shape.

[0050] As shown in FIG. 10(a), in the second embodiment, the small diameter roll mounting plate (10) has a circular shape, and therefore the small diameter rolls (9) are arranged on the small diameter roll mounting plate (10) in a circular shape centered on the small diameter roll mounting plate shaft (11).

[0051] The small diameter roll mounting plate (10) is provided with grooves (12) in the same number as the small diameter rolls (9), and similarly to the first embodiment described above, a mechanism is provided that allows the position of the small diameter rolls (9) to be varied along the grooves (12). Note that a description of the mechanism for varying the position of the small diameter rolls (9) is omitted here, as it is the same as in the first embodiment. The grooves (12) are formed radially from the small diameter roll mounting plate shaft (11), which is the center of the small diameter roll mounting plate (10).

[0052] As shown in Fig. 10(b), similar to the first embodiment, multiple small diameter rolls (9) are arranged in parallel. This is to make the conveying angle of the conveyed sheet (P) gentler than when a single roll is arranged. As shown in Fig. 10(a), the multiple small diameter rolls (9) are arranged in a circular shape when viewed from the side.

[0053] In order to arrange the small diameter roll (9) in a circular shape when viewed from the side, small diameter roll mounting plates (10) are arranged on both ends of the small diameter roll (9) and sandwiched between them to form a cylindrical shape, which is called a corner roll (8).

[0054] The small diameter roll (9) and the small diameter roll mounting plate (10) can be connected within the groove (12) by the small diameter roll mounting plate shaft (13) and the guide (14). Also, by fixing the small diameter roll mounting plate (10) to the paper machine by the small diameter roll mounting plate shaft (11), it can be installed as a corner roll (8) of the paper machine. These configurations are the same as those in the first embodiment described above.

[0055] In the second embodiment, as shown in FIG. 10( a), an example in which eight small diameter rolls (9) are installed has been described. However, the eight small diameter rolls (9) are arranged at equal intervals. The number of small diameter rolls (9) is not limited to this and may be appropriately set according to the size of the papermaking machine, the conveying path, and the like. However, if the number of small diameter rolls (9) is too large, the space between the small diameter rolls (9) becomes narrow. Therefore, if the mounting positions of the small diameter rolls (9) are moved radially inward, the small diameter rolls (9) will come into contact with each other. Therefore, the number of small diameter rolls (9) to be arranged is appropriately determined depending on the fluctuation range of the diameter of the corner rolls (8). Conversely, if the number of small diameter rolls (9) is too small, the conveying angle will change drastically, causing wrinkles in the sheet (P). Therefore, it is preferable to install 8 to 10 small diameter rolls (9).

[0056] FIG. 11 is a diagram showing the difference in diameter of the corner roll (8) due to fluctuations in the small diameter roll (9) in the second embodiment, and is represented by a curve (R) approximating the circumference of the corner roll (8). FIG. 11(a) shows the normal state, in which the diameter of the curve (R) approximating the circumference of the corner roll (8) is the smallest. FIG. 11(b) shows the state in which the position of the small diameter roll (9) is moved within the groove (12) to prevent wrinkles, and the diameter of the curve (R) approximating the circumference of the corner roll (8) is the largest.

[0057] Fig. 12 is a diagram for explaining the effects of the second embodiment. In the second embodiment, small diameter rolls (9) are arranged in a circular shape to form corner rolls (8), but as shown in Fig. 12, the conveyed sheet (P) does not come into contact with all of the small diameter rolls (9). In Fig. 12(a), the sheet (P) comes into contact with four small diameter rolls (9a) (indicated by diagonal lines in the drawing). Conversely, the four small diameter rolls (9b) do not come into contact with the sheet (P).

[0058] The small diameter roll (9a) that is in contact with the sheet (P) being conveyed wears out due to friction with the sheet (P) and deteriorates over time. Therefore, as shown in FIG. 12(b), by periodically swapping (rotating) the position of the small diameter roll (9a) with the small diameter roll (9b) that is not in contact with the sheet (P), stable conveyance can be maintained. Furthermore, when replacing the small diameter roll (9), it is possible to simply swap (rotate) the position rather than replacing it with a new one, thereby reducing the effort required for new replacement. However, small diameter rolls (9b) that are not actually in use do not necessarily need to be installed even if the small diameter roll mounting plate (10) is circular.

[0059] (Modification of the second embodiment) Next, a modified example of the second embodiment will be described with reference to Fig. 13. In the modified example of the second embodiment, similar to the second embodiment described above, the small diameter roll mounting plate (10) has a circular shape, and the shafts (13) of the multiple small diameter rolls (9) are also arranged in a circular shape relative to the small diameter roll mounting plate (10). However, it differs from the second embodiment in that the small diameter roll mounting plate (10) and the multiple small diameter rolls (9) rotate together as the sheet (P) is conveyed.

[0060] As shown in Figure 13(b), in the small diameter roll mounting plates (10) provided at both ends of the small diameter roll (9), small diameter roll mounting plate bearings (18) are provided on the outside of the small diameter roll mounting plate shaft (11). This bearing (18) has a bearing built into the inside of the small diameter roll mounting plate shaft (11), and by fitting the small diameter roll mounting plate shaft (11) into this, the small diameter roll mounting plate shaft (11) rotates. The bearings (18) are fixed to the frame of the paper machine.

[0061] The small diameter roll mounting plate (10) is rotatable by the bearings (18), so that as the sheet (P) is conveyed, the small diameter roll (9) (enclosed by a dotted line (9a) in FIG. 13(a)) in contact with the sheet (P) tends to rotate in the direction of the arrow along with the sheet (P), and the small diameter roll mounting plate (10) can also rotate around the bearings (18). Note that in (a), the small diameter roll mounting plate (10) is omitted in order to explain the state of the small diameter roll (9).

[0062] The multiple small diameter rolls (9) come into contact with the sheet (P) and rotate together with the small diameter roll mounting plate (10), so that the sheet (P) is conveyed in the conveying direction while smoothly changing direction, thereby preventing the occurrence of wrinkles. During conveyance, the small diameter roll mounting plate (10) (not shown) rotates, but the multiple small diameter rolls (9) do not move. [Explanation of symbols]

[0063] M Fourdrinier paper machine 1 Preparation Department 2 Wire section 2a wire 3 Press Department 3a Table Roll 4 Drying section 4a Tubular dryer 5 Calendar section 5a Calendar Roll 6 Reel section 7 nozzles 8 Corner Roll P-sheet 9 Small diameter roll 10 Small diameter roll mounting plate 11 Small diameter roll mounting plate shaft 12 grooves 13 Shaft 14 Guide 15 Spring 16 motors 17 Small diameter roll position adjustment plate 18 Small diameter roll mounting plate bearing 19 Adjustment screw

Claims

1. A papermaking machine comprising at least a preparation section for dispersing fibers, which are raw materials for a sheet, in water, a wire section for facilitating the dispersion of the fibers and forming a wet sheet, a press section for applying pressure to the sheet to dehydrate it, a drying section for drying the sheet after dehydration, a calendar section for smoothing the surface of the sheet and adjusting the paper thickness, and a reel section for winding up the sheet, a corner roll mechanism for changing a conveying angle of the sheet during the process of conveying the sheet from the press unit to the reel unit, the corner roll mechanism comprises a plurality of small diameter rolls arranged in parallel, small diameter roll mounting plates located at both ends of the plurality of small diameter rolls for fixing the small diameter rolls in predetermined positions, a small diameter roll mounting plate shaft for connecting the small diameter roll mounting plate to the paper machine, a spring connecting the small diameter roll mounting plate shaft and the small diameter roll, a small diameter roll position adjustment plate provided on the small diameter roll mounting plate adjacent to the small diameter roll on the opposite side of the spring with the small diameter roll sandwiched between them, and an adjustment screw located on the opposite side of the small diameter roll with the small diameter roll position adjustment plate sandwiched between them, which rotates by being driven by a motor to change the position of the small diameter roll position adjustment plate, the small diameter roll mounting plate has a plurality of grooves cut out radially from the small diameter roll mounting plate shaft and in a substantially rectangular shape; A corner roll mechanism characterized in that the fixed position of the small diameter roll is changed by rotating the adjustment screw to change the position of the small diameter roll position adjustment plate, thereby making it possible to move the small diameter roll within the groove by expanding and contracting the spring.

2. 2. The corner roll mechanism according to claim 1, wherein the small diameter roll mounting plate has a fan-like or circular shape, and the plurality of small diameter rolls are fixed in an arc shape around the small diameter roll mounting plate shaft of the small diameter roll mounting plate.

3. 3. The corner roll mechanism according to claim 2, wherein when the small diameter roll mounting plate has a circular shape, the small diameter roll is provided with a rotatable small diameter roll mounting plate shaft, and rotates together with the small diameter roll mounting plate around the small diameter roll mounting plate shaft as the sheet is transported.

Images