Sheet-shaped body cutting device, gypsum sheet manufacturing device, and gypsum sheet manufacturing method

Abstract

This sheet-shaped body cutting device has: a conveyance device that conveys the sheet-shaped body; a cutting device that cuts the sheet-shaped body; and a contact-type length measurement device that measures the length of the sheet-shaped body being conveyed by the conveyance device. The cutting device has an upper blade that has a first roll and a first cutter, a lower blade that has a second roll and a second cutter, a first servo motor that causes the first roll to rotate around a first rotation axis, a second servo motor that causes the second roll to rotate around a second rotation axis, and a rotation control device that controls the rotation of the first servo motor and the rotation of the second servo motor. The rotation control device controls the rotation of the first servo motor and the second servo motor on the basis of the measurement results from the length measurement device, and pinches the sheet-shaped body with the first cutter and the second cutter to cut the sheet-shaped body.

Description

Plate-shaped body cutting device, gypsum board manufacturing device, and method for manufacturing gypsum board

[0001] The present invention relates to a plate-shaped body cutting device, a gypsum board manufacturing device, and a method for manufacturing a gypsum board.

[0002] In Patent Document 1, rotors that are arranged to rotate in opposite directions above and below the paper to be cut and have rotary knives attached to their outer peripheral surfaces, respectively, and among the gears that are respectively fitted to the shafts on which the rotors are mounted so as to mesh with each other, one of the gears is composed of two gears of the same size. A spring support fitting is fixed to the inner gear of the two gears, and a spring receiving fitting is fixed to the outer gear. Further, a backlash removing device is provided in which a spring is press-fitted between the spring support fitting and the spring receiving fitting. A twin rotary cutter is disclosed.

[0003] Microfilm of Japanese Utility Application No. 53-121102 (Japanese Unexamined Utility Model Publication No. 55-37195)

[0004] In ceramic products such as gypsum boards and resin products, etc., plate-shaped bodies having a plate shape have been conventionally manufactured as products and used for various purposes.

[0005] The manufacturing method of the above-mentioned plate-shaped body products varies depending on the products to be manufactured. For example, by kneading and molding raw materials, a semi-finished product having a plate shape is formed, and while the semi-finished product is being conveyed by a conveying means, cutting, drying, firing, etc. are performed as necessary to manufacture it. And when cutting is performed, a cutting device including a rotary cutter as disclosed in Patent Document 1 has been conventionally used.

[0006] A rotary cutter has, for example, an upper blade and a lower blade, and the plate-shaped body is sandwiched between the upper blade and the lower blade for cutting. In a conventional rotary cutter, the upper blade and the lower blade were rotated by one drive motor and gears, but it was necessary to adjust the positions of the upper blade and the lower blade in consideration of backlash of the gears, etc., and it was difficult to adjust the positions of the blades. Also, maintenance, adjustment, etc. of the gears were necessary.

[0007] In view of the problems of the above-mentioned prior art, one aspect of the present invention aims to provide a plate-shaped cutting device equipped with motors that can directly rotate the upper blade and the lower blade, respectively.

[0008] To solve the above problems, a plate-shaped cutting apparatus according to one aspect of the present disclosure comprises: a conveying device for conveying a plate-shaped object; a cutting apparatus for cutting the plate-shaped object being conveyed by the conveying device; and a contact-type length measuring device for measuring the length of the plate-shaped object being conveyed by the conveying device. The cutting apparatus comprises: an upper blade having a first roll and a first cutter mounted along the longitudinal side of the first roll; a lower blade having a second roll and a second cutter mounted along the longitudinal side of the second roll; a first servo motor for rotating the first roll about a first rotation axis along the central axis of the first roll; a second servo motor for rotating the second roll about a second rotation axis along the central axis of the second roll; and a rotation control device for controlling the rotation of the first servo motor and the second servo motor. The rotation control device controls the rotation of the first servo motor and the second servo motor based on the measurement result of the length measuring device, and cuts the plate-shaped object by sandwiching it between the first cutter and the second cutter.

[0009] According to one embodiment of the present invention, a plate-shaped cutting device can be provided that is equipped with motors capable of directly rotating the upper blade and the lower blade, respectively.

[0010] Figure 1 is an explanatory diagram of a plate-shaped body cutting apparatus according to one aspect of the present disclosure. Figure 2A is a schematic cross-sectional view along line A-A in Figure 1 when the length measuring device is of the contact type. Figure 2B is a schematic cross-sectional view along line A-A in Figure 1 when the length measuring device is of the non-contact type. Figure 2C is a schematic cross-sectional view along line C-C in Figure 2B. Figure 3 is a schematic cross-sectional view along line B-B in Figure 1. Figure 4 is an explanatory diagram of the arrangement of the first cutter and the second cutter when they clamp a plate-shaped body. Figure 5 is an explanatory diagram of an example of rotation control of the upper blade by a rotation control device. Figure 6A is an enlarged schematic view of region D in Figure 2A. Figure 6B is an enlarged schematic view of region D in Figure 2A. Figure 6C is an enlarged schematic view of region D in Figure 2A. Figure 7 is an explanatory diagram of a plate-shaped body manufacturing apparatus and a gypsum board manufacturing apparatus according to one aspect of the present disclosure.

[0011] The embodiments for carrying out the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments described below, and various modifications and substitutions can be made to the embodiments described below without departing from the scope of the present invention. [Plate-shaped material cutting device] The plate-shaped material cutting device of this embodiment will be described below with reference to the drawings.

[0012] Figure 1 shows a top view of an example configuration of the plate-shaped body cutting device 10 of this embodiment.

[0013] Figure 2A shows a schematic cross-sectional view along line A-A in Figure 1 when the length measuring device is of the contact type.

[0014] Figure 2B shows a schematic cross-sectional view along line A-A in Figure 1 when the length measuring device is of the non-contact type.

[0015] Figure 2C shows a schematic cross-sectional view along the line C-C in Figure 2B.

[0016] Figure 3 shows a schematic cross-sectional view along the line B-B in Figure 1.

[0017] Figure 4 shows an explanatory diagram of the arrangement of the first cutter and the second cutter when cutting a plate-like material.

[0018] Figure 5 shows an example of upper blade rotation control using a rotation control device.

[0019] Figures 6A, 6B, and 6C show enlarged schematic diagrams of region D in Figure 2A.

[0020] In Figures 1 to 3, the X-axis indicates the conveying direction of the plate-like material. The Y-axis is the axis along the length of the rolls of the cutting device 13 and the width of the plate-like material 11. The Z-axis is the axis along the height. In Figures 1, 2A, and 2B, the plate-like material 11 is conveyed from right to left along the X-axis. The above drawings are schematic diagrams to explain the configuration of the plate-like material cutting device of this embodiment and do not accurately represent the sizes, etc.

[0021] In this specification, the names of components may be described with prefixes such as "1st roll," "2nd roll," etc. The prefixes "1st," "2nd," etc., are merely used to identify each component and prevent confusion, and do not indicate arrangement, priority, or anything of the sort. Therefore, when there is no risk of confusion, or when referring to them collectively, they may simply be written as "roll."

[0022] As shown in Figure 1, the plate-shaped body cutting device 10 of this embodiment includes a conveying device 12 for conveying the plate-shaped body 11, a cutting device 13, and a length measuring device 14.

[0023] After describing the plate-shaped body 11 to be cut by the plate-shaped body cutting device 10, the various components of the plate-shaped body cutting device 10 of this embodiment will be described. (1) Regarding the plate-shaped body, the plate-shaped body 11 to be cut by the plate-shaped body cutting device 10 of this embodiment is not particularly limited, and any object having a plate-like shape can be used. Therefore, whether it is a final product or a semi-finished product that is in the process of being manufactured or processed, the plate-shaped body 11 can be applied to the plate-shaped body cutting device 10 of this embodiment.

[0024] When the plate-like body 11 is a semi-finished product, the semi-finished product may be one or more molded articles selected from ceramics and resins, etc., which have not undergone at least one of drying and firing, or in which a reaction such as hardening has not progressed, such as an unhardened gypsum board or a green sheet. The phrase "a reaction such as hardening has not progressed" includes cases where the reaction has partially progressed but has not progressed completely.

[0025] Furthermore, examples of final products made from one or more molded products selected from ceramics, resins, etc., which were listed as semi-finished products, include building materials such as gypsum boards, components for electronic parts, and structural materials.

[0026] Examples of gypsum boards include glass mat gypsum boards, glass fiber nonwoven gypsum-containing boards, gypsum boards specified in JIS A 6901 (2014), gypsum boards that are lighter or heavier than gypsum boards specified in JIS A 6901 (2014) (hereinafter, gypsum boards specified in the above JIS, and gypsum boards that are lighter or heavier than gypsum boards specified in JIS, will be collectively referred to as "gypsum boards"), slag gypsum boards, and other gypsum boards.

[0027] The above-mentioned glass mat gypsum board is, for example, a gypsum board whose surface is covered with a glass mat.

[0028] A gypsum board containing glass fiber nonwoven fabric is, for example, a gypsum board in which glass fiber nonwoven fabric (glass tissue) is embedded on the surface side.

[0029] Furthermore, gypsum board is, for example, a gypsum board whose surface is covered with a base paper for boards.

[0030] Other gypsum boards are gypsum boards that do not fall into any of the above categories, and include, for example, gypsum boards that do not have a surface paper covering.

[0031] The final product described above can also be the plate-like body 11 that is cut.

[0032] The thickness of the plate-like body 11 is not particularly limited and can be arbitrarily selected according to the cutting capacity of the cutting device 13.

[0033] Since the plate-like body 11 is cut by the cutting device 13, when viewed in the direction of transport of the plate-like body 11, a continuous strip of plate-like body 111 is arranged upstream of the cutting device 13. Also, the plate-like body 112 that has been cut by the cutting device 13 and made into individual pieces is arranged downstream of the cutting device 13. (2) Components of the plate-like body cutting device The components of the plate-like body cutting device will be described below. (2-1) Transport device The transport device 12 is a device that transports the plate-like body 11.

[0034] The conveying device 12 can be any device capable of supporting and conveying the plate-like body 11, and is not particularly limited. For example, one or more types selected from belt conveyors, roller conveyors, etc., can preferably be used.

[0035] The conveying device 12 can be installed upstream and downstream of the cutting device 13 along the conveying direction of the plate-like body 11. The conveying device 12 installed upstream of the cutting device 13 may be designated as the upstream conveying device 121, and the conveying device 12 installed downstream of the cutting device 13 may be designated as the downstream conveying device 122.

[0036] The upstream conveying device 121 and the downstream conveying device 122 may use the same type of conveying device, or they may use different types of conveying devices.

[0037] For example, Figure 1 shows an example where a roller conveyor is used as the conveying device 12, but the system is not limited to this configuration, and part or all of the conveying device 12 can be a belt conveyor.

[0038] However, it is preferable that the downstream conveying device 122 is equipped with a conveying roll 122A at least immediately after the cutting device 13. In this case, it is also preferable that the rotation direction of the conveying roll 122A is controlled by a rotation control device 15 or the like.

[0039] A transport roll 122A is provided immediately after the cutting device 13, and by rotating the transport roll 122A in the direction of arrow b shown in Figure 2A, which is opposite to arrow a (see Figures 2A and 2B), which is the transport direction of the plate-like body 11, foreign matter adhering to the surface of the transport roll 122A can be removed. (2-2) Cutting device The cutting device 13 can cut the plate-like body 11 being transported by the transport device 12. The cutting device 13 may also have an upper blade 21, a lower blade 22, a first servo motor 214, a second servo motor 224, and a rotation control device 15. (Upper blade, lower blade) The cutting device 13 has an upper blade 21 and a lower blade 22.

[0040] As shown in Figures 1, 2A, and 2B, the upper blade 21 includes a first roll 211 and a first cutter 212 mounted along the longitudinal side of the first roll 211.

[0041] As shown in Figures 2A and 2B, the lower blade 22 has a second roll 221 and a second cutter 222 mounted along the longitudinal side of the second roll 221.

[0042] The upper blade 21 and the lower blade 22 can rotate along the arrows shown in Figures 2A and 2B, respectively, and rotate in opposite directions. For the upper blade 21, the first roll 211 can rotate with the first rotation axis 213, which is along the central axis of the first roll 211, as its center of rotation (axis of rotation). For the lower blade 22, the second roll 221 can rotate with the second rotation axis 223, which is along the central axis of the second roll 221, as its center of rotation (axis of rotation). The plate-like body 11 can be cut by sandwiching it between the first cutter 212 of the upper blade 21 and the second cutter 222 of the lower blade 22.

[0043] In the plate-shaped cutting device 10 of this embodiment, there is no need to have, for example, a gear or the like between the upper blade 21 and the lower blade 22 to transmit the movement of the upper blade 21 to the lower blade 22, and the upper blade 21 and the lower blade 22 can be isolated from rotational movement. For this reason, the upper blade 21 and the lower blade 22 can each rotate independently. (Servo motor) The cutting device 13 may have a servo motor to rotate the upper blade 21 and the lower blade 22.

[0044] Specifically, as shown in FIG. 3, the cutting device 13 can have a first servo motor 214 that rotates the first roll 211 about a first rotation axis 213 along the central axis of the first roll 211.

[0045] Further, the cutting device 13 can have a second servo motor 224 that rotates the second roll 221 about a second rotation axis 223 along the central axis of the second roll 221.

[0046] A servo motor means a motor equipped with a controller, a driver, an encoder, etc. as necessary in order to accurately realize position, speed, and rotational force along with a control signal from the rotation control device 15.

[0047] Since the cutting device 13 has the first servo motor 214 and the second servo motor 224, it becomes possible to precisely control and rotate the rotation of the upper blade 21 and the rotation of the lower blade 22 respectively. Therefore, it becomes possible to provide the plate-shaped body cutting device 10 equipped with motors that can directly rotate the upper blade 21 and the lower blade 22 respectively. For this reason, since a gear is not required for the rotation mechanisms of the upper blade 21 and the lower blade 22, there is no backlash, and position adjustment of the first cutter 212 and the second cutter 222 of the upper blade 21 and the lower blade 22 becomes unnecessary. Furthermore, maintenance and adjustment of the gear also become unnecessary.

[0048] Also, since the cutting device 13 has a servo motor for each roll, when cutting the plate-shaped body 11, the first cutter 212 and the second cutter 222 of the upper blade 21 and the lower blade 22 respectively can be set at desired angles and arrangements. That is, it becomes possible to individually control the positions and the like of the first cutter 212 and the second cutter 222. For this reason, it also becomes possible to make the shape of the cutting surface of the plate-shaped body 11 into a desired shape.

[0049] FIGS. 6A, 6B, and 6C show enlarged schematic views of the region D in FIG. 2A including the cutting surface 61 of the plate-shaped body 11. FIGS. 6A, 6B, and 6C correspond to cross-sectional views in a plane including the cutting surface 61 by the cutting device 13 along the longitudinal direction of the plate-shaped body 11.

[0050] For example, as shown in Figure 6A, the cut surface 61 may be perpendicular to the upper surface 62 and lower surface 63 of the plate-like body 11. By making the cut surface 61 perpendicular to the upper surface 62 and lower surface 63 of the plate-like body 11, trimming loss can be reduced.

[0051] Furthermore, as shown in Figures 6B and 6C, the cut surface 61 may be a surface inclined with respect to the upper surface 62 and lower surface 63 of the plate-like body 11. In Figures 6B and 6C, the inclination angle of the cut surface 61 is made extremely large to clearly show the difference in shape from Figure 6A, but the inclination angle may be smaller than that in Figures 6B and 6C.

[0052] The shape of the cross-section 61 is not limited to the forms shown in Figures 6A, 6B, and 6C, but can be any shape.

[0053] The first servo motor 214 and the second servo motor 224 can rotate the first roll 211 and the second roll 221 independently, respectively. Therefore, the rotation speed and operation of the first roll 211 and the second roll 221 may differ. In addition, the first servo motor 214 and the second servo motor 224 can change the rotation speed of the first roll 211 and the second roll 221 while they are rotating. (Rotation control device) The cutting device 13 may also have a rotation control device 15.

[0054] The rotation control device 15 can control the rotation of the first servo motor 214 and the second servo motor 224.

[0055] The rotation control device 15 may include a CPU, which is an arithmetic processing unit for performing calculations necessary for control, RAM or ROM as main memory, auxiliary storage device, input / output interface, and display device as an output device. The CPU, main memory, auxiliary storage device, input / output interface, and output device of the rotation control device 15 can be interconnected by a bus. All of the above components of the rotation control device 15 do not need to be housed in the same enclosure; for example, the auxiliary storage device and display device may be provided externally. The auxiliary storage device is a storage device such as an SSD or HDD.

[0056] CPU stands for Central Processing Unit, RAM stands for Random Access Memory, and ROM stands for Read Only Memory. SSD stands for Solid State Drive, and HDD stands for Hard Disk Drive.

[0057] Examples of input / output interfaces include wired or wireless interfaces for exchanging measurement data from the length measuring device 14, control values ​​from the first servo motor 214 and the second servo motor 224, and so on.

[0058] Furthermore, input / output interfaces include user interfaces such as touch panels, keyboards, and operation buttons for selecting control conditions.

[0059] The rotation control device 15 can be configured using a personal computer (PC) or the like. Therefore, each of the components of the rotation control device 15 may be realized through the collaborative action of software and hardware, where the CPU of the personal computer or other information processing device executes a program that has been pre-stored.

[0060] The rotation control device 15 may, for example, control the rotation speed of the first servo motor 214 and the second servo motor 224 in accordance with the transport speed of the transport device 12. Figure 1 shows an example in which the plate-shaped body cutting device 10 has one rotation control device 15, but the device is not limited to this configuration and can be controlled by multiple control devices. Specifically, for example, a rotation control device can be provided for the first servo motor 214 and the second servo motor 224, respectively. In this case, it is preferable that the rotation control devices are configured to send and receive data between them. The rotation control device 15 may also be incorporated into the first servo motor 214 and the second servo motor 224.

[0061] The rotation control device 15 may be configured to receive the measurement results from the length measuring device 14, as shown in Figure 1. For example, the rotation control device 15 can control the rotation of the first servo motor 214 and the second servo motor 224 based on the measurement results from the length measuring device 14. Then, the plate-like body 11 can be sandwiched between the first cutter 212 and the second cutter 222 and cut.

[0062] Specifically, for example, when the length of the plate-like body 11 measured by the length measuring device 14 reaches a predetermined value, the first servo motor 214 and the second servo motor 224 may be rotated to cut the plate-like body 11. By performing such control, a plate-like body 11 of the desired length can be obtained.

[0063] Figure 4 shows the arrangement of the first cutter 212 and the second cutter 222 when clamping the plate-like body 11.

[0064] Both the first cutter 212 and the second cutter 222 can have a sawtooth shape, that is, a shape in which multiple triangular protrusions are arranged along the longitudinal side. When cutting the plate-like body 11, the positions of the first cutter 212 and the second cutter 222 can be adjusted so that the protrusions 222A of the second cutter 222 are positioned between the protrusions 212A of the first cutter 212.

[0065] Furthermore, to prevent the first cutter 212 and the second cutter 222 from coming into contact and being damaged, a gap 41 can be formed between the first cutter 212 and the second cutter 222 so that they do not come into direct contact. In other words, the positions of the first cutter 212 and the second cutter 222 can be adjusted so that a gap 41 is formed.

[0066] Therefore, when the plate-like body 11 is cut by sandwiching it between the first cutter 212 and the second cutter 222, cutting debris may remain in the area corresponding to the gap 41. Cutting debris is likely to occur, for example, in the gap 42 between the convex portion 212A of the first cutter 212 and the concave portion 222B of the second cutter 222, or in the gap 43 between the concave portion 212B of the first cutter 212 and the convex portion 222A of the second cutter 222.

[0067] Therefore, in order to prevent the cutting debris from falling onto the conveying device 12, the rotation control device 15 may adjust the rotation speed of the first rotating shaft 213 by the first servo motor 214, i.e., the rotation speed of the first roll 211, after starting to cut the plate-like body 11. The rotation control device 15 may also adjust the rotation speed of the second rotating shaft 223 by the second servo motor 224, i.e., the rotation speed of the second roll 221.

[0068] An example of rotation control of the upper blade 21 by the rotation control device 15 will be explained with reference to Figure 5. For example, the rotation of the first roll 211 can be stopped when the first cutter 212 is in the standby position 51. Then, when cutting a plate-like body 11, the rotation can be started along the arrow 50, moved to the lowest end position 52, and then rotated further. As the first cutter 212 moves within the region 500 before and after the lowest end position 52, it can come into contact with the plate-like body 11 and cut the plate-like body 11.

[0069] Furthermore, when moving within region 500 or region 501, the rotation control device 15 can adjust the rotation speed of the first rotating shaft 213. For example, when the first cutter 212 moves within region 501 in Figure 5, the rotation control device 15 can rotate the first rotating shaft 213 at a predetermined rotation speed until it reaches a predetermined deceleration start position 53. The rotation control device 15 can also increase the rotation speed of the first rotating shaft 213 when the first cutter 212 moves within region 501, until the first cutter 212 reaches the deceleration start position 53. Specifically, the rotation speed of the first rotating shaft 213 can also be increased after the first cutter 212 contacts the plate-like body 11 and begins cutting the plate-like body 11, until it reaches the deceleration start position 53. By increasing the rotational speed of the first rotating shaft 213 as the first cutter 212 moves within the region 501, the cut surface (gypsum core) can be pressed more firmly when cutting the plate-like body 11. This prevents cutting debris from being generated from the cut surface of the plate-like body 11 and reduces the amount of cutting debris that falls onto the conveying device 12.

[0070] Furthermore, the rotation control device 15 may reduce the rotational speed of the first rotating shaft 213 when the first cutter 212 moves within the region 501, for the purpose of achieving a desired shape for the cut surface, etc. The rotation control device 15 may also change the rotational speed of the first rotating shaft 213 when the first cutter 212 moves within the region 501.

[0071] The rotation control device 15 can reduce the rotation speed of the first rotating shaft 213 from, for example, the deceleration start position 53, and reduce the rotation speed during the region 502, so that when the first cutter 212 reaches the standby position 51, the rotation of the first rotating shaft 213 can be stopped.

[0072] Here, the case of the upper blade 21 was explained as an example, but for the lower blade 22 as well, a range of speeds can be defined for each speed, and the rotational speed of the second rotating shaft 223 can be accelerated or decelerated. (Bearings) A first servo motor 214 and a second servo motor 224 can be installed at one end along the longitudinal side of the upper blade 21 and the lower blade 22, respectively. At the other end along the longitudinal side of the upper blade 21 and the lower blade 22, a first bearing 215 and a second bearing 225 can be provided, respectively, to support the first rotating shaft 213 and the second rotating shaft 223 so as to allow the first roll 211 and the second roll 221 to rotate smoothly. The first bearing 215 and the second bearing 225 may also have members to support the bearings as needed. Alternatively, the first bearing 215 and the second bearing 225 may be connected to a position changing device 16, and the position changing device 16 may be used to change the position of the first bearing 215 and the second bearing 225, thereby changing the distance L between the first roll 211 and the second roll 221.

[0073] As shown in Figures 1, 2A, 2B, and 3, the bearings may be installed at multiple locations along the longitudinal direction of the first rotating shaft 213 and the second rotating shaft 223.

[0074] For example, as shown in Figure 3, two or more first bearings 215, such as a first bearing 2151 and a first bearing 2152, may be installed on the first rotating shaft 213. Also, two or more second bearings 225, such as a second bearing 2251 and a second bearing 2252, may be installed on the second rotating shaft 223. (2-3) Length measuring device The length measuring device 14 is a device for measuring the length of a plate-like body 11 being transported by the transport device 12. For example, when the length of the plate-like body 11 measured by the length measuring device 14 reaches a predetermined value, the cutting device 13 can be activated to cut the plate-like body 11. (2-3-1) Contact-type length measuring device The length measuring device 14 may have a measuring section 141 for measuring the length of a plate-like body 11 being transported by the transport device 12. The measuring section 141 can measure by contacting the plate-like body 11, for example. In this case, the length measuring device 14 can be a contact-type device for measuring the length of a plate-like body 11 being transported by the transport device 12.

[0075] For the measuring section 141 of the contact-type length measuring device 14, for example, a measuring roll can be used.

[0076] The length measuring device 14 may further include a controller 142 that receives measurement data from the measuring unit 141 as needed and outputs the measurement data to the rotation control device 15. The controller 142 can also record the measurement data measured by the measuring unit 141 as needed.

[0077] (2-3-2) Non-contact length measuring device As shown in Figures 2B and 2C, the length measuring device 14 can also be a non-contact device that measures the length of the plate-shaped body 11 being transported by the transport device 12. A non-contact length measuring device means a device that measures the length of the plate-shaped body 11 without directly contacting the plate-shaped body 11.

[0078] In the case of a non-contact type length measuring device, the measuring section 141 of the length measuring device 14 can be positioned away from the plate-shaped body 11. As the non-contact type length measuring device 14, for example, a laser Doppler velocometer can be used.

[0079] In the case of a non-contact type length measuring device, for example as shown in Figure 2C, it can have a light-emitting unit 143 that irradiates a laser beam 145 onto the plate-shaped body 11 from a measuring unit 141, and a light-receiving unit 144 that receives the light reflected by the plate-shaped body 11. Then, by utilizing the Doppler effect to measure the transport speed of the plate-shaped body 11 and accumulating the amount of plate-shaped body 11 transported per unit time, the length of the plate-shaped body 11 can be calculated. (2-4) Position changing device The plate-shaped body cutting device 10 of this embodiment may further have any other device.

[0080] For example, depending on the thickness of the plate-like body 11, a position changing device 16 can be provided to change the distance L between the first roll 211 and the second roll 221, as shown in Figure 3.

[0081] The plate-shaped cutting device 10 has a position-changing device 16, which allows the distance between the upper blade 21 and the lower blade 22 to be easily adjusted to an appropriate distance depending on the type of plate-shaped material 11 being manufactured. This makes it easy to switch between different types of plate-shaped materials being manufactured, thereby increasing productivity.

[0082] The position changing device 16 may also have a first position changing device 161 and a second position changing device 162 at both ends along the longitudinal sides of the upper blade 21 and the lower blade 22, respectively. By having a first position changing device 161 and a second position changing device 162, the distance L between the first roll 211 and the second roll 221 can be adjusted with particular precision.

[0083] The configuration of the position changing device 16 is not particularly limited and may include a drive device for displacing the position of a member in the height direction. Examples of drive devices include hydraulic jacks, pneumatic jacks, and electric motors. When a motor is used as the drive device, a timing belt, pulleys, etc., may be included as needed to convert rotational motion into linear motion.

[0084] The member to be displaced by the drive device is not particularly limited, but it is preferable, for example, not to displace the position of the second roll 221 having the second cutter 222, but to displace the position of the first roll 211 having the first cutter 212. For this reason, the drive device can displace the position of any member including the upper blade 21, such as the first bearing 215, the first rotating shaft 213, or the first servo motor 214.

[0085] The lower blade 22 can be positioned such that, for example, the bottom surface of the plate-like body 11 passes through the recess 222B of the second cutter 222.

[0086] Furthermore, a shim or the like may be placed between the upper blade 21 and the lower blade 22 to prevent direct contact between the first cutter 212 and the second cutter 222 even when they are closest together. The shim placed between the upper blade 21 and the lower blade 22 can be selected, for example, according to the minimum thickness of the plate-like body 11 to be manufactured.

[0087] The position changing device 16 may also have a linear motion mechanism that acts as a guide when moving in the height direction as needed. Examples of such linear motion mechanisms include linear rails (linear guides), linear shafts, linear bushings, etc.

[0088] As described above, if the position changing device 16 has a first position changing device 161 and a second position changing device 162, the position changing device 16 may further have a position control device that controls the displacement of the first position changing device 161 and the displacement of the second position changing device 162. The position control device can have the same configuration as the one described for the rotation control device 15, so its description is omitted here. The rotation control device 15 and the position control device can also be combined into a single control device.

[0089] Furthermore, the position changing device 16 may also include a distance measuring device for detecting the positions of the first roll 211 and the second roll 221, and for measuring the distance between the first roll 211 and the second roll 221. For example, a laser distance meter can be used as the distance measuring device.

[0090] If the position changing device 16 has a position control device, for example, the amount of change in the position of the first roll 211 may be controlled by the position changing device 16 based on the measurement result of the distance measuring device. (2-5) Position detection device The plate cutting device 10 of this embodiment may also have a position detection device 17 that detects the positions of the first cutter 212 and the second cutter 222.

[0091] Specifically, the plate-shaped cutting device 10 may also include a first position detection device 171 for detecting the position of the first cutter 212 and a second position detection device 172 for detecting the position of the second cutter 222. In this case, the plate-shaped cutting device 10 may also include a position comparison device 18.

[0092] The configuration of the position detection device 17 is not particularly limited, but as shown in Figure 3, the position detection device 17 may include, for example, a rotating plate 17A installed at the end of the first rotating shaft 213 or the second rotating shaft 223, and a sensor 17B.

[0093] The rotating plate 17A can be installed to rotate in accordance with the rotation of the first rotation axis 213 and the second rotation axis 223, and the surface facing the sensor 17B can have a projection 17C for position detection by the sensor 17B. The projection 17C can be positioned in a location corresponding to the first cutter 212 and the second cutter 222, for example, in a position that overlaps with the first cutter 212 and the second cutter 222 on the rotating plate 17A when viewed along the longitudinal direction of the first rotation axis 213 and the second rotation axis 223.

[0094] The protruding portion 17C is provided on the surface of the rotating plate 17A facing the sensor 17B, and is a portion that protrudes so that the distance between it and the sensor 17B is shorter than that of other parts. The protruding portion 17C may also be formed by fixing bolts or the like to the rotating plate 17A.

[0095] Furthermore, depending on the type of sensor 17B, the protruding portion 17C may be replaced with a detection portion having a different color or the like from the other parts of the surface of the rotating plate 17A facing the sensor 17B.

[0096] The protrusion 17C can be provided on the side surface 31 of the rotating plate 17A, or on the main surface 32 of the rotating plate 17A. The main surface 32 of the rotating plate 17A is the surface opposite to the surface connected to the first rotation axis 213 and the second rotation axis 223 of the rotating plate 17A.

[0097] The type of sensor 17B is not particularly limited and can be an optical sensor or a proximity switch, for example. The sensor 17B can be installed to monitor the area through which the protrusion 17C passes when the rotating plate 17A rotates, and to detect when the protrusion 17C has passed.

[0098] The position comparison device 18 can compare the position of the first cutter 212 detected by the first position detection device 171 with the position of the first cutter 212 detected by the encoder of the first servo motor 214. The position comparison device 18 can also compare the position of the second cutter 222 detected by the second position detection device 172 with the position of the second cutter 222 detected by the encoder of the second servo motor 224.

[0099] The position comparison device 18 may calculate the difference between the position of the first cutter 212 detected by the first position detection device 171 and the position detected by the encoder of the first servo motor 214. The position comparison device 18 may also calculate the difference between the position of the second cutter 222 detected by the second position detection device 172 and the position detected by the encoder of the second servo motor 224. If the difference between each of these positions exceeds a predetermined set value, an alarm may be issued by an alarm device (not shown). In addition, for example, the position information of the encoders of each servo motor may be corrected.

[0100] The position comparison device 18 can have the same configuration as the rotation control device 15, so its explanation is omitted here. The rotation control device 15 and the position comparison device 18 can also be combined into a single device.

[0101] The plate-shaped cutting device 10 has a position detection device 17 and a position comparison device 18, which allows for particularly accurate control of the rotation of the upper blade 21 and the lower blade 22, preventing problems such as misalignment of the cutting position when cutting the plate-shaped body 11. (2-6) Air supply device, scraper As shown in Figure 1, the plate-shaped cutting device 10 of this embodiment may also have an air supply device 19 that blows air onto the plate-shaped body 11 to remove foreign matter adhering to the cut surface or upper surface of the plate-shaped body 11 being transported. The air supply device 19 may be configured to blow air onto the cut surface of the plate-shaped body 11 immediately after it has been cut by the cutting device 13.

[0102] Furthermore, the plate-shaped cutting device 10 of this embodiment may also have a scraper or the like installed so as to contact the surface of the rotating conveyor roll 122A in order to remove foreign matter adhering to the conveyor roll 122A. [Plate-shaped manufacturing device, gypsum board manufacturing device] Next, an example of the configuration of the plate-shaped manufacturing device and the gypsum board manufacturing device of this embodiment will be described.

[0103] The manufacturing apparatus for plate-like bodies according to this embodiment may include a plate-like body cutting apparatus according to one aspect of the present disclosure.

[0104] Furthermore, a plate-like body, such as a gypsum board, can also be manufactured. In this case, the manufacturing apparatus for the plate-like body can be a gypsum board manufacturing apparatus. Therefore, the gypsum board manufacturing apparatus of this embodiment can also have a plate-like body cutting apparatus according to one aspect of the present disclosure, and the plate-like body can be molded into a gypsum slurry.

[0105] The types of gypsum boards produced by the gypsum board manufacturing apparatus of this embodiment and the gypsum board manufacturing method described later include, as previously stated, any of the following selected from glass mat gypsum boards, glass fiber nonwoven fabric gypsum-containing boards, gypsum boards, slag gypsum boards, and other gypsum boards.

[0106] The plate-shaped body manufacturing apparatus and the gypsum board manufacturing apparatus of this embodiment may have various devices and means necessary for manufacturing plate-shaped bodies, in addition to the plate-shaped body cutting apparatus according to one aspect of the present disclosure.

[0107] For example, if it is necessary to mix raw materials, the plate-shaped body manufacturing apparatus and the gypsum board manufacturing apparatus of this embodiment may have a mixing means (mixer) for mixing the raw materials. Furthermore, the plate-shaped body manufacturing apparatus and the gypsum board manufacturing apparatus of this embodiment may have a molding apparatus, etc., for molding and processing the raw materials, the raw material mixture prepared by the mixing means, the raw material slurry, etc., into a desired shape and size.

[0108] Below, using Figure 7, the configuration of the apparatus for manufacturing plate-like bodies and gypsum boards, as an example of the configuration of the apparatus for manufacturing plate-like bodies and gypsum boards, will be described using the case of manufacturing gypsum boards as an example.

[0109] The gypsum board manufacturing apparatus 70 shown in Figure 7 includes, in addition to the plate-shaped cutting apparatus 10 according to one aspect of the present disclosure, a mixer 72 which is a mixing means for mixing raw materials, and a molding apparatus 75 which molds the gypsum slurry prepared in the mixer 72. An example of the apparatus configuration will be described in detail below. (1) Mixer The mixer 72 can prepare a gypsum slurry containing calcined gypsum and water, and supply the gypsum slurry onto the covering material. For this reason, the mixer 72 can be placed in a predetermined position related to the transport path of the covering material 71, such as the first gypsum board base paper 711 and the second gypsum board base paper 712, for example, above or to the side of the transport path. In the mixer 72, calcined gypsum, which is the raw material for the gypsum slurry, water, and optionally various additives and foam can be mixed together to prepare the gypsum slurry.

[0110] Calcined gypsum, also known as calcium sulfate 1 / 2 hydrate, is an inorganic composition with hydraulic properties. As calcined gypsum, either β-type calcined gypsum or α-type calcined gypsum, or a mixture of both, can be used. β-type calcined gypsum is obtained by calcining gypsum, either alone or in combination with natural gypsum, by-product gypsum, flue gas desulfurization gypsum, or recycled gypsum such as waste gypsum boards, in the atmosphere. α-type calcined gypsum is obtained by calcining gypsum, either alone or in combination with natural gypsum, by-product gypsum, flue gas desulfurization gypsum, or recycled gypsum such as waste gypsum boards, in water (including steam).

[0111] When manufacturing gypsum boards, it is preferable that the calcined gypsum used as a raw material contains β-type calcined gypsum, and it is even more preferable that the main component of the calcined gypsum used as a raw material for gypsum boards is β-type calcined gypsum. Note that when the main component of the calcined gypsum used as a raw material for gypsum boards is β-type calcined gypsum, it means that β-type calcined gypsum accounts for more than 50% by mass of the calcined gypsum used as a raw material for gypsum boards. In the manufacture of gypsum boards, the calcined gypsum used as a raw material may consist solely of β-type calcined gypsum.

[0112] To produce α-type calcined gypsum, it is necessary to calcine dihydrate gypsum, such as natural gypsum, under pressure in water or steam using an autoclave. In contrast, β-type calcined gypsum can be produced by calcining dihydrate gypsum, such as natural gypsum, under atmospheric pressure in air, and β-type calcined gypsum can be produced more productively than α-type calcined gypsum.

[0113] Examples of additives include one or more selected from adhesion improvers, inorganic fibers, lightweight aggregates, refractory materials, setting retarders, setting accelerators, water-reducing agents, foaming agents, foam diameter adjusters, water-repellent agents, organic carboxylic acids, organic carboxylates, etc.

[0114] Adhesion improvers can improve the adhesion between hardened gypsum (hardened gypsum slurry) and gypsum board base paper. Examples of adhesion improvers include starch and polyvinyl alcohol.

[0115] Examples of inorganic fibers include glass fibers.

[0116] Examples of fire-resistant materials include vermiculite.

[0117] Examples of foaming agents include alkyl sodium sulfate, alkyl ether sulfate, alkylbenzene sulfonate sodium, and polyoxyethylene alkyl sulfate.

[0118] Examples of foam size regulators include sulfosuccinate-type surfactants.

[0119] Examples of water-repellent agents include silicone and paraffin.

[0120] Alternatively, calcined gypsum and some additives, such as solid additives, can be pre-mixed and stirred to form a gypsum composition before being supplied to the mixer 72.

[0121] Furthermore, foam can be added at the gypsum slurry dispensing port 721, and by adjusting the amount of foam added, a gypsum slurry of any desired density can be produced. (2) Molding apparatus The first gypsum board base paper 711 and the second gypsum board base paper 712, which are being transported inside the gypsum board manufacturing apparatus 70, reach the molding apparatus 75. Here, gypsum slurry 74 is supplied between the first gypsum board base paper 711 and the second gypsum board base paper 712 from the mixer 72 through the pipeline 73. As a result, a continuous laminate can be formed in which a layer formed by the gypsum slurry 74 is placed between the first gypsum board base paper 711 and the second gypsum board base paper 712.

[0122] Specifically, for example, a gypsum slurry 74 of a predetermined density is supplied and deposited on a first gypsum board base paper 711 that is continuously conveyed. The widthwise ends of the first gypsum board base paper 711 are folded along predetermined lines, extending upwards and then inwards, thereby partially encasing the deposited layer of gypsum slurry 74. After this, a second gypsum board base paper 712, conveyed at the same speed, can be placed on top of the deposited layer of gypsum slurry 74 that has been partially encased by the first gypsum board base paper 711. Next, it is formed by passing it through a molding device 75 that determines the thickness and width of the gypsum board. A gypsum board can also be formed by the above procedure. In this case, a layer of gypsum slurry of a certain density is formed between the first gypsum board base paper 711 and the second gypsum board base paper 712.

[0123] Thus, the molding apparatus 75 of the gypsum board manufacturing apparatus 70 can perform a molding process to mold the gypsum slurry, thereby manufacturing a gypsum slurry molded body 76. (3) Plate-shaped cutting apparatus The gypsum board manufacturing apparatus 70 of this embodiment may have a plate-shaped cutting apparatus 10 according to one aspect of the present disclosure downstream of the molding apparatus 75.

[0124] The gypsum board manufacturing apparatus 70 may have one or more plate-shaped cutting devices 10 as needed. The gypsum board manufacturing apparatus 70 may have a first plate-shaped cutting device (rough cutting device) for rough cutting, for example, for the purpose of placing the manufactured gypsum slurry molded body 76 into a dryer. The gypsum board manufacturing apparatus 70 may also have a second plate-shaped cutting device (cutting device) for cutting the gypsum board to the size of the final product.

[0125] The plate-shaped cutting device 10 has already been described, so its explanation will be omitted here. (4) Dryer In this embodiment, the gypsum board manufacturing apparatus 70 may also be equipped with a dryer or the like downstream of the molding apparatus 75, if necessary.

[0126] The dryer can reduce the excess moisture in the gypsum slurry molded body 76.

[0127] The plate-shaped body manufacturing apparatus and gypsum board manufacturing apparatus of this embodiment are equipped with a plate-shaped body cutting device according to one aspect of the present disclosure. Therefore, it is not necessary to adjust the positions of the first cutter 212 and the second cutter 222 before starting the manufacturing of the plate-shaped body or gypsum board, thereby increasing productivity. In addition, since the rotation of the upper blade 21 and the lower blade 22 can be controlled independently, the shape of the cut surface can be made into a desired shape. [Method for manufacturing gypsum board] The method for manufacturing gypsum board of this embodiment may include a cutting step in which a molded body of gypsum slurry is cut using a plate-shaped body cutting device according to one aspect of the present disclosure.

[0128] The method for manufacturing gypsum boards according to this embodiment may include, for example, the following steps: gypsum slurry preparation, molding, cutting, and hardening.

[0129] In the gypsum slurry preparation process, calcined gypsum, which is the raw material for the gypsum slurry, is mixed with water, and in some cases, various additives and foam, to prepare the gypsum slurry.

[0130] In the molding process, the gypsum slurry can be molded into a plate-like shape.

[0131] In the cutting process, the molded gypsum slurry can be cut using the cutting device described above.

[0132] In the curing process, the plate-shaped molded body obtained in the molding process can be cured.

[0133] Each step will be explained using the example of gypsum board being manufactured. (Gypsum slurry preparation step) In the gypsum slurry preparation step, the calcined gypsum mentioned above, water, and in some cases various additives and foam are mixed together to prepare the gypsum slurry.

[0134] For example, as explained in the gypsum board manufacturing apparatus, these raw material components can be mixed using a mixer or the like to prepare a gypsum slurry. Note that the raw materials for the gypsum slurry have already been explained, so the explanation will be omitted here. (Molding process) In the molding process, the gypsum slurry obtained in the gypsum slurry preparation process can be molded into a plate shape. If the gypsum board to be manufactured is a gypsum board, in the molding process the gypsum slurry can be supplied between two sheets of base paper for the board to be molded into a plate shape. (Cutting process) In the cutting process, the molded gypsum slurry can be cut using a plate-shaped cutting device according to one aspect of this disclosure.

[0135] Furthermore, after the gypsum slurry molded body is formed in the molding process, the gypsum slurry gradually hardens. Therefore, the cutting process can be carried out, for example, during the hardening process or after the hardening process is completed. However, it is preferable to carry out the cutting process only after the hardening process has progressed to the point where the gypsum slurry molded body can be cut.

[0136] The cutting process can be performed multiple times. Therefore, the method for manufacturing gypsum boards in this embodiment may also include a first cutting process, which can be called a rough cutting process. The first cutting process allows the gypsum slurry molded body to be cut to a desired size, for example, according to the size of the dryer used in the drying process described later.

[0137] Furthermore, the second cutting step can be carried out, for example, after the drying step. (Curing step) After the molding step, the curing step can be carried out. The curing step is a step in which the gypsum slurry molded body obtained in the molding step is cured.

[0138] The hardening process can be carried out by the transformation of calcined gypsum (hemihydrate gypsum) in the gypsum slurry into needle-shaped crystals of dihydrate gypsum through a hydration reaction, followed by solidification. Therefore, within the molded body formed in the molding process, the calcined gypsum added to the gypsum slurry reacts with water, and the hardening process can be carried out as the hydration reaction of the calcined gypsum proceeds.

[0139] Furthermore, the method for manufacturing gypsum boards may include any additional steps. Specifically, for example, it may include the following drying step: (Drying step) In the drying step, the gypsum slurry molded body can be dried. In the drying step, excess moisture contained in the gypsum slurry molded body can be dried. In addition, a molded body in which the hardening step has been completed can be supplied to the drying step. The drying step can be carried out by forcibly drying the molded body using a dryer.

[0140] The method of forcibly drying molded bodies using a dryer is not particularly limited, but for example, a dryer can be installed on the transport path of the molded bodies, allowing them to be dried continuously as they pass through the dryer. Alternatively, molded bodies can be brought into the dryer and dried in batches.

[0141] According to the gypsum board manufacturing method of this embodiment, the cutting process can be carried out using a plate-shaped cutting device according to one aspect of the present disclosure. Therefore, it is not necessary to adjust the positions of the first cutter 212 and the second cutter 222 before starting the gypsum board manufacturing, and productivity can be increased. In addition, since the rotation of the upper blade 21 and the lower blade 22 can be controlled independently, the shape of the cut surface can be made into a desired shape. [Note] (1) A plate-shaped cutting apparatus according to one aspect of the present disclosure comprises: a conveying device for conveying a plate-shaped object; a cutting device for cutting the plate-shaped object being conveyed by the conveying device; and a contact-type length measuring device for measuring the length of the plate-shaped object being conveyed by the conveying device. The cutting apparatus comprises: an upper blade having a first roll and a first cutter mounted along the longitudinal side of the first roll; a lower blade having a second roll and a second cutter mounted along the longitudinal side of the second roll; a first servo motor for rotating the first roll about a first rotation axis along the central axis of the first roll; a second servo motor for rotating the second roll about a second rotation axis along the central axis of the second roll; and a rotation control device for controlling the rotation of the first servo motor and the second servo motor. The rotation control device controls the rotation of the first servo motor and the second servo motor based on the measurement result of the length measuring device, and cuts the plate-shaped object by sandwiching it between the first cutter and the second cutter.

[0142] (2) A plate-shaped cutting apparatus according to one aspect of the present disclosure comprises: a conveying device for conveying a plate-shaped object; a cutting device for cutting the plate-shaped object being conveyed by the conveying device; and a non-contact type length measuring device for measuring the length of the plate-shaped object being conveyed by the conveying device, wherein the cutting apparatus comprises: an upper blade having a first roll and a first cutter mounted along the longitudinal side of the first roll; a lower blade having a second roll and a second cutter mounted along the longitudinal side of the second roll; a first servo motor for rotating the first roll about a first rotation axis along the central axis of the first roll; a second servo motor for rotating the second roll about a second rotation axis along the central axis of the second roll; and a rotation control device for controlling the rotation of the first servo motor and the second servo motor, wherein the rotation control device controls the rotation of the first servo motor and the second servo motor based on the measurement result of the length measuring device, and cuts the plate-shaped object by sandwiching it between the first cutter and the second cutter.

[0143] (3) In (1) or (2), the rotation control device may adjust the rotation speed of the first roll by the first servo motor and the rotation speed of the second roll by the second servo motor after starting to cut the plate-like body.

[0144] (4) In any of (1) to (3), a position changing device may be further provided to change the distance between the first roll and the second roll.

[0145] (5) In any of (1) to (4), the device includes a first position detection device for detecting the position of the first cutter, a second position detection device for detecting the position of the second cutter, and a position comparison device, wherein the position comparison device compares the position of the first cutter detected by the first position detection device with the position of the first cutter detected by an encoder of the first servo motor, and compares the position of the second cutter detected by the second position detection device with the position of the second cutter detected by an encoder of the second servo motor.

[0146] (6) A gypsum board manufacturing apparatus according to one aspect of the present disclosure has a plate-shaped body cutting apparatus according to any of (1) to (5), wherein the plate-shaped body is a molded body of gypsum slurry.

[0147] (7) A method for manufacturing a gypsum board according to one aspect of the present disclosure comprises a cutting step of cutting a molded body of gypsum slurry with any of the plate-shaped cutting devices described in (1) to (5).

[0148] Although a plate-shaped cutting device, a gypsum board manufacturing device, and a method for manufacturing gypsum boards have been described above in terms of embodiments, the present invention is not limited to the above embodiments. Various modifications and changes are possible within the scope of the gist of the present invention as described in the claims.

[0149] This application claims priority based on Japanese Patent Application No. 2024-169118, filed with the Japan Patent Office on 27 September 2024, and the entire contents of Japanese Patent Application No. 2024-169118 are incorporated herein by reference.

[0150] 10 Plate-shaped cutting device 11 Plate-shaped body 111 Plate-shaped body 112 Plate-shaped body 12 Conveying device 121 Upstream conveying device 122 Downstream conveying device 122A Conveying roll a Arrow b Arrow 13 Cutting device 14 Length measuring device 141 Measuring unit 142 Controller 143 Light emitting unit 144 Light receiving unit 145 Laser light 15 Rotation control device 16 Position changing device 161 First position changing device 162 Second position changing device L Distance 17 Position detection device 171 First position detection device 172 Second position detection device 17A Rotating plate 17B Sensor 17C Protruding part 18 Position comparison device 19 Air supply device 21 Upper blade 211 First roll 212 First cutter 212A Convex part 212B Recess 213 First Rotating Shaft 214 First Servo Motor 215 First Bearing 2151 First Bearing 2152 First Bearing 22 Lower Blade 221 Second Roll 222 Second Cutter 222A Protrusion 222B Recess 223 Second Rotating Shaft 224 Second Servo Motor 225 Second Bearing 2251 Second Bearing 2252 Second Bearing 41 Gap 42 Gap 43 Gap 50 Arrow 51 Standby Position 52 Lowest Position 53 Deceleration Start Position 500 Area 501 Area 61 Cut Surface 62 Top Surface 63 Bottom Surface 70 Gypsum Board Manufacturing Apparatus 71 Covering Material 711 Base Paper for First Gypsum Board 712 Base Paper for Second Gypsum Board 72 Mixer 721 Portion 73 Pipeline 74 Gypsum slurry 75 Molding apparatus 76 Gypsum slurry molded body

Claims

1. A plate-shaped cutting device comprising: a conveying device for conveying a plate-shaped body; a cutting device for cutting the plate-shaped body being conveyed by the conveying device; and a contact-type length measuring device for measuring the length of the plate-shaped body being conveyed by the conveying device, wherein the cutting device comprises: an upper blade having a first roll and a first cutter mounted along the longitudinal side of the first roll; a lower blade having a second roll and a second cutter mounted along the longitudinal side of the second roll; a first servo motor for rotating the first roll about a first rotation axis along the central axis of the first roll; a second servo motor for rotating the second roll about a second rotation axis along the central axis of the second roll; and a rotation control device for controlling the rotation of the first servo motor and the second servo motor, wherein the rotation control device controls the rotation of the first servo motor and the second servo motor based on the measurement result of the length measuring device, and cuts the plate-shaped body by sandwiching it between the first cutter and the second cutter.

2. A plate-shaped cutting device comprising: a conveying device for conveying a plate-shaped body; a cutting device for cutting the plate-shaped body being conveyed by the conveying device; and a non-contact type length measuring device for measuring the length of the plate-shaped body being conveyed by the conveying device, wherein the cutting device comprises: an upper blade having a first roll and a first cutter mounted along the longitudinal side of the first roll; a lower blade having a second roll and a second cutter mounted along the longitudinal side of the second roll; a first servo motor for rotating the first roll about a first rotation axis along the central axis of the first roll; a second servo motor for rotating the second roll about a second rotation axis along the central axis of the second roll; and a rotation control device for controlling the rotation of the first servo motor and the second servo motor, wherein the rotation control device controls the rotation of the first servo motor and the second servo motor based on the measurement result of the length measuring device, and cuts the plate-shaped body by sandwiching it between the first cutter and the second cutter.

3. The plate-shaped body cutting apparatus according to claim 1 or 2, wherein the rotation control device adjusts the rotation speed of the first roll by the first servo motor and the rotation speed of the second roll by the second servo motor after the cutting of the plate-shaped body has started.

4. The plate cutting apparatus according to claim 1 or 2, further comprising a position changing device for changing the distance between the first roll and the second roll.

5. A plate-shaped body cutting apparatus according to claim 1 or 2, comprising: a first position detection device for detecting the position of the first cutter; a second position detection device for detecting the position of the second cutter; and a position comparison device, wherein the position comparison device compares the position of the first cutter detected by the first position detection device with the position of the first cutter detected by an encoder of the first servo motor, and compares the position of the second cutter detected by the second position detection device with the position of the second cutter detected by an encoder of the second servo motor.

6. A gypsum board manufacturing apparatus having a plate-shaped cutting device according to claim 1 or claim 2, wherein the plate-shaped body is a molded body of gypsum slurry.

7. A method for manufacturing a gypsum board, comprising a cutting step of cutting a molded body of gypsum slurry using a plate-shaped cutting device according to claim 1 or claim 2.

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