baber/WOPTO huggingface dataset:
Patent KR-20040047404-A (KR)
Title: Method for Controlling Brushless Direct Current Direct Driver Motor for landary Machine
Inventor: HWANG JIN SEONG
IPC: H02P7/29
Filed: 2002-11-30
Abstract: PURPOSE: A method is provided to prevent noises caused due to over-current by directly or gradually turning off a PWM output in accordance with the rotating speed of a BLDC motor when a BLDC motor stop signal is input during operation. CONSTITUTION: A method comprises a step(S100,S200) of judging the rotating speed of a BLDC motor when a BLDC motor stop signal is input during operation; a step(S300,S400,S500) of stopping the operation of the BLDC motor by gradually reducing the voltage duty of the PWM signal applied to the BLDC motor if the rotating speed of the BLDC motor is lower than a reference speed; and a step(S700) of turning off the PWM signal applied to the BLDC motor and stopping the operation of the BLDC motor if the rotating speed of the BLDC motor is higher than the reference speed.
Patent KR-20030044893-A (KR)
Title: Method of driving AC surface-discharge type plasma display panel
Inventor: KASHIO YUKINORI
IPC: G09G3/28
Filed: 2002-11-30
Abstract: PURPOSE: To provide a method for driving an AC surface discharge type plasma display panel which does not cause flickers by keeping a wide range of sustained discharge, but is capable of shortening a scanning period without increasing black in brightness. CONSTITUTION: A sub-field is constituted of a reset period 21, a scanning period 22, a wall charge forming period 24, and a sustained period 23, and for the scanning period 22, the duration of the scanning pulse Vw is shorten. Then, for the wall charge forming period 24, a common electrode C and a data electrode D are kept at the ground potential, and a wall charge forming pulse Vwm of the same potential as the scanning pulse Vw is applied to all the scanning electrodes S. The duration of the wall charge forming pulse Vwm is, for example, made to 3 to 50 μs. Thus, space charges remaining in a cell is attracted onto each electrode to form the wall charges.
Patent KR-20040050002-A (KR)
Title: A method of manufacturing additives for steel-making use
Inventor: TOYODA TETSUO
IPC: C22B1/16
Filed: 2002-12-09
Abstract: PURPOSE: A preparation method of additive for steelmaking is provided to simultaneously realize recycling of dust at low cost even with a minimum facility, enable recycling of stainless steel dust as well as ordinary steel dust and solidify powder type industrial waste to be concerned about secondary pollution. CONSTITUTION: The preparation method of additive for steelmaking comprises a step of mixing 10 to 20 wt.% of powder type slaked lime with powder type target constituent material; a step of adding 2 to 10 wt.% of farinaceous binder to a mixed powder of target constituent material and slaked lime; a step of granulating pellet as adding water to the farinaceous binder added powder; a step of molding the granulated pellet into solidified pellet by naturally drying the granulated pellet; and a step of hardening the solidified pellet for 72 hours or more, wherein the target constituent material is powder residue of aluminum dross from which aluminum is not recovered, wherein the target constituent material is a mixture comprising 30 to 60 wt.% of aluminum material containing 40 wt.% or more of metal aluminum, and 70 to 40 wt.% of calcium carbonate powder as aluminum cutting powder or a mixture of aluminum cutting powder and high quality aluminum dross powder, wherein the target constituent material is a mixture of 40 to 60 wt.% of carbon material such as coke powder or coal powder and 60 to 40 wt.% of calcium carbonate powder, and wherein the target constituent material 30 to 70 wt.% of stainless steel dust and 70 to 30 wt.% of aluminum dross containing aluminum content of 30%.
Patent KR-20040050326-A (KR)
Title: Passive cooling type cooling apparatus having multiple cooling pin structure using phase change materials and passive cooling system thereof
Inventor: LEE HYO JIN
IPC: F28D20/02
Filed: 2002-12-10
Abstract: PURPOSE: A self energy cooling apparatus and a self energy cooling system of a multi-cooling fin structure using phase change materials are provided to prevent polluted fine articles from moving in, and reduce the cost for energy. CONSTITUTION: A self energy cooling apparatus(1) includes internal and external pipes(11,12) for containing a phase change material(15), and a heat dissipating rod(14) extended from one ends of the internal and external pipes. The external pipe has a plurality of outer fins(111) formed on an outer peripheral surface thereof at regular gaps. The internal pipe is placed inside the external pipe, and has a plurality of inner fins(121) formed on an outer peripheral surface thereof at regular gaps. A cooling core(13) is inserted into the internal pipe and has a plurality of core fins(131) formed on an outer peripheral surface thereof. The phase change material is put in a space part between the internal pipe and the external pipe.
Patent KR-20030052993-A (KR)
Title: Shielded connector
Inventor: KUBO TAKAFUMI
IPC: H01R13/658
Filed: 2002-12-17
Abstract: PURPOSE: To provide a shielded connector having a shield shell which is not deformed against wrenching in every direction. CONSTITUTION: A shield shell 8 is mounted around an insulation housing 12 so that a side wall 18 of a lower shell 8b locates inside a side wall 12 of an upper shell 8a to overlap each other, in this case, a latch arm 16 engages with an engaging hole 10, and the upper shell 8a and the lower shell 8b are fixed to each other so as not to move laterally and vertically. As the upper shell is fixed to a base board by a leg part 48, the deformation preventing effect is strengthened all the more, and the shield shell has a structure hardly deforming against wrenching in every direction.
Patent KR-20040054075-A (KR)
Inventor: KIM GYEONG HWAN
IPC: H05B6/66
Filed: 2002-12-17
Abstract: PURPOSE: A control circuit of a microwave oven is provided to reduce largely the number of elements and the total size of a PCB(Printed Circuit Board) by forming plural circuits with one chip. CONSTITUTION: A control circuit of a microwave oven includes an interrupt circuit, a constant potential circuit, a sound control unit, a fan motor control unit, an HVT control unit, and a door sensing unit. The interrupt circuit(1) receives AC voltage from an LVT(Low Voltage Transformer) and generates the AC power of 60Hz to a micro computer. The constant potential circuit(2) receives the DC voltage of the first rectifier and generates the constant voltage 5V. The sound control unit(3) controls a sound output according to a control command of the micro computer. The fan motor control unit(4) controls a driving operation of a fan motor according to a control command of the micro computer. The HVT control unit(5) controls an HVT(High Voltage Transformer) according to a control command of the micro computer. The door sensing unit(6) detects an opening state and a shutting state of a door.
Patent KR-20040056018-A (KR)
Title: Dryfan assembly for Dishwasher
Inventor: PARK NEUNG SEO
IPC: A47L15/48
Filed: 2002-12-23
Abstract: PURPOSE: A dry-fan assembly for a dish washer is provided to improve drying efficiency by simplifying a drying passage. CONSTITUTION: A dry-fan assembly for a dish washer is composed of a fan housing(1) installed inside a door, a discharge hole(31) formed at one side of the fan housing and communicated with the outside of the door, a suction hole(21) formed at the other side of the fan housing and communicated with the inside of the dish washer, a dry-fan(10), and a switching unit for opening/closing the suction hole. The dry-fan is installed opposite to the suction hole, rotated by a motor(11), and discharges steam in the dish washer through the discharge hole.
Patent KR-20030015184-A (KR)
Inventor: LEE JEONG MIN
IPC: B65D47/06
Filed: 2002-12-16
Abstract: PURPOSE: A fixed amount of liquid discharge container is provided to seek a container with stability in which there is no change in metered liquid even when the main body of the container is overturned after metering. CONSTITUTION: A main space(101) containing contents is disposed below a main body(100), a discharger(200) for moving liquid is formed above the main body(100) and a metering space(102) metering a constant amount is formed above the discharger(200). A discharge hole(201) for moving the contents of the main space(101) to the metering space(102) is formed at the discharger(200) and a pressure reduction hole(202) for reducing a pressure formed at the metering space(102) is formed at one side thereof.
Patent KR-20040057224-A (KR)
Title: Method of manufacturing MCM ball grid array package
Inventor: KIM YUN HO
IPC: H01L21/60
Filed: 2002-12-26
Abstract: PURPOSE: A method for manufacturing an MCM(Multi-Chip Module) BGA(Ball Grid Array) package is provided to test the performance and reliability of a semiconductor chip after the completion of a package by exposing the wires connected with a test pad and conductors to the outside. CONSTITUTION: A plurality of devices are bonded on a circuit board(110). The circuit board includes a circuit pattern and solder lands. The first bonding process is carried out for connecting input/output pads of the devices with electrode pads of the circuit pattern using the first wires(151). The second bonding process is carried out on a test pad(114) of the devices and conductors(131,132,133) of the circuit pattern using the second wires(211). The diameter of the second wire is larger than that of the first wire. An encapsulation part is selectively formed on the resultant structure. At this time, the second wires are exposed to the outsides.
Patent KR-20040058431-A (KR)
Title: communication signal managing device of the TAM-EMS and controlling method therefore
Inventor: KIM MIN JEON
IPC: H04L12/28
Filed: 2002-12-26
Abstract: PURPOSE: A device for managing a communication signal in a TAM(Total Access Module)-EMS(Element Management System) and a control method therefor are provided to process data by using port numbers and ID numbers of TAM-DSLAM equipments while transceiving the data in a TAM-EMS. CONSTITUTION: An EMS(1) outputs an operator's command in SNMP method, and manages plural TAM equipments. A TAM-EMS portion(2) prepares IP addresses of DSLAM equipments and an operation command where one promised port number is included, in an IP header by using TCP/IP according to the command of the EMS(1), and outputs an IP packet. Plural TAM-DSLAM portions(3) analyzes a self IP and the one promised port number in the IP header, and processes voice traffic and data traffic for PSTN/ISDN subscribers and XDSL subscribers. Plural TAM-RAM(Remote Access Module) portions(4) analyze a self IP and the one promised port number in the IP header, and process the voice traffic and the data traffic for the subscribers.
Patent KR-20040058478-A (KR)
Title: Mems variable optical attenuator
Inventor: HONG SEOK GI
IPC: G02B26/02
Filed: 2002-12-27
Abstract: PURPOSE: A variable optical attenuator of a MEMS(Micro Electro Mechanical System) is provided to reduce generation of scattered light by forming a surface layer on an upper surface of an optical shielding layer. CONSTITUTION: A variable optical attenuator of a MEMS includes a substrate, a micro-electro actuator, a transmitting terminal, a receiving terminal, and an optical shielding layer. The substrate is formed with a flat surface. The transmitting terminal and the receiving terminal(20,30) are arranged on the flat surface of the substrate. The micro-electro actuator is arranged on the substrate. The optical shielding layer(47) is moved to a predetermined position by the micro-electro actuator. A surface layer is formed on an upper surface of the optical shielding layer. The surface layer has a reflectance ratio below 80 percent.
Patent KR-20040059710-A (KR)
Title: Apparatus for projection display with curved screen
Inventor: KIM SEONG GI
IPC: G03B21/62
Filed: 2002-12-28
Abstract: PURPOSE: A projection type image reproducing system including a curvature screen is provided to watch images displayed on a screen with high resolution. CONSTITUTION: A projection type image reproducing system includes red, green and blue CRTs(Cathode Ray Tubes)(150), three projection lenses(250), and a screen(400). The three projection lenses are respectively located in front of the red, green and blue CRTs and magnify images sources on fluorescent faces of the red, green and blue CRTs at a predetermined magnifying power. The screen has a predetermined concave curvature in a viewing direction to control a viewing distance. Lights projected from the three projection lenses are imaged on the screen. The screen includes a Fresnel screen and a Lenticular screen. The Fresnel screen changes the lights projected from the projection lenses such that the lights have a predetermined directivity in an optical axis direction. The Lenticular screen is located in front of the Fresnel screen, forms an image from lights that have passed the Fresnel screen and controls a viewing angle to improve luminance.
Patent KR-20040061702-A (KR)
Inventor: KIM DAE GYEONG
IPC: B23K9/127
Filed: 2002-12-31
Abstract: PURPOSE: A weld line tracing control system is provided to make a robot trace a weld line with a simple structure and operation by exactly recognizing information that the center of the robot is out of the weld line and angle that the center of the robot is deviated from the weld line. CONSTITUTION: A weld line tracing control system includes a robot, an image obtaining unit(72), and an image processing unit. The image obtaining unit comprises a pair of laser diodes(73a,73b) separated from each other at the predetermined distance to emit a predetermined laser; a pair of reflecting mirrors(74a,74b) corresponding to the laser diodes and obliquely reflecting the laser emitted from the laser diodes to cross each other toward a weld line(W); a camera(75) arranged between the laser diodes to photograph a weld line region by the laser emitted from the laser diodes; and a laser filter(75a) installed in the front side of the camera to filter to transmit only the laser.
Patent KR-20020027512-A (KR)
Title: Sound communication system between a portable unit and a communication terminal
IPC: G04G21/00
Filed: 1999-11-26
Abstract: The invention concerns a communication system between a portable unit (1), such as a watch, and a communication terminal (2) such as a personal computer, characterised in that the communication terminal (2) comprises at least means for transmitting (6) a sound signal bearing an information, and the portable unit (1) comprises at least processing means (14) for processing data, and receiving (8) and converting (12) means for picking up said sound signal and converting said sound signal into data to be processed by said processing means (14).
Patent KR-20020065490-A (KR)
Title: 전자적으로 제어가능한 펜
IPC: B41J2/21
Filed: 2000-10-20
Abstract: 기록 표면에 접촉하기 위한 잉크젯 헤드 및 철필(1154)과 같은 마킹 장치(1120)를 포함한 펜으로, 상기 펜은 상기 표면에 보이는 경로를 표시하도록 동작하고, 상기 마킹 장치는 색 또는 선 굵기와 같은 경로의 속성을 변경하기 위하여 전자적으로 제어 가능하다.  상기 펜은 버튼 또는 슬라이더(1404, 1406, 1408)와 같은 유저 인터페이스 및 유저가 속성을 수정할 수 있는 디스플레이(1410)를 포함한다.  센서는 메모리에 기억하거나 또는 외부 제어 장치로 송신할 수 있는 부호화된 데이터 또는 색을 포함하는 이미지를 감지할 수 있다.  유저는 그의 기억된 세트들을 순환하거나 탐색하여 속성들을 선택할 수 있다.  탐색 중에 있는 적어도 한 속성의 기억된 세트들은 그 경로에 순차적으로 침적되거나 표시될 수 있다.
Patent KR-20020043259-A (KR)
IPC: F16J15/40
Filed: 2000-11-01
Abstract: 공정 중 반도체 웨이퍼와 같은 작업편을 고정시키기 위한 방법과 장치가 제공된다.  그 장치는 평판 조립체, 가스 공급원 및 전원을 포함한다.  평판 조립체는 작업편을 수용하는 전기적으로 절연된 클램핑 표면을 형성하는 유전체와 클램핑 표면 밑에 놓인 전극들을 포함한다.  상기 전극들은 클램핑 표면의 외주에 또는 외주 부근에 밀봉 전극들을 포함한다.  가스 공급원은 작업편과 클램핑 표면 사이의 영역에 작업편과 클램핑 표면 사이의 열에너지를 전도하는 가스를 공급한다.  전원은 작업편 내부에서 내측으로 이동하는 파형을 생산하기 위해 밀봉 전극들에 밀봉 전압들을 공급한다.  가스는 내부로 이동하는 파형에 의해 클램핑 표면의 외주로부터 내부로 수송된다.  상기 밀봉 전극들은 클램핑 표면의 외주에 또는 외주 부근에 동심원의 형태를 가질 수 있다.
Patent KR-20020077400-A (KR)
Title: Detection and quantification of joint and tissue inflammation
IPC: A61B8/08
Filed: 2001-01-29
Abstract: The apparatus and method for the detection and quantification of joint and tissue inflammation (100) of the present invention comprises a sensing component (102) for obtaining and collecting data indicative of the surface or dimensions of the joint or tissue. The sensing component (102) comprises various components for obtaining measurements of the cardinal signs of inflammation. Preferably the sensing component (102) includes a device for detecting swelling (104), a color analyzing device (108), a temperature measuring device (110), a pain or tenderness detection device (112), an archival and retrieval device (114), and a display device (116). In operation, a patient is placed in position for examination of the joint or tissue area, measurements are taken of one or more of the cardinal signs of inflammation at the joint or tissue area, the measurements are automatically stored in an archival storage and retrieval device (114), and from the measurements an inflammation score is derived which can be compared against a baseline.
Patent KR-20020075799-A (KR)
IPC: A61K31/155
Filed: 2001-01-12
Abstract: 본 발명은 하기 화학식 I의 화합물인 신규 갑상선 수용체 리간드를 제공한다. 
     <화학식 I> 
     
       
     
     상기 식 중, 
     X는 산소 (-O-), 황 (-S-), 카르보닐 (-CO-), 메틸렌 (-CH 2 -) 또는 -NH-이고; 
     Y는 -(CH 2 ) n - (이 때, n은 1 내지 5의 정수임) 또는 시스 또는 트랜스-메틸렌이고; 
     R 1 은 할로겐, 트리플루오로메틸, 탄소수 1 내지 6의 알킬 또는 탄소수 3 내지 7의 시클로알킬이고; 
     R 2 및 R 3 은 서로 동일하거나 상이하며, 수소, 할로겐, 탄소수 1 내지 4의 알킬 또는 탄소수 3 내지 6의 시클로알킬이고, 이 때 R 2 및 R 3 중 적어도 하나는 수소가 아니고; 
     R 4 는 수소 또는 저급 알킬이고; 
     R 5 는 수소 또는 저급 알킬이고; 
     R 6 은 카르복실산 또는 그의 에스테르 또는 프로드러그이고; 
     R 7 은 수소, 알카노일기 또는 아로일기이거나, 또는 생전환되어 유리 페놀 구조 (이 때, R 7 =H임)를 생성할 수 있는 다른 기이다. 
     또한, 본 발명은 상기 기재한 화합물을 치료 유효량 투여하는, 대사 기능부전 관련 질환 또는 T 3 조절 유전자의 발현에 의존하는 질환의 예방, 억제 또는 치료 방법을 제공한다.  이와 같은 대사 기능부전 관련 질환 또는 T 3 조절 유전자의 발현에 의존하는 질환의 예에는 비만, 고콜레스테롤혈증, 아테롬성 경화증, 심부정맥, 우울증, 골다공증, 갑상선 기능저하증, 갑상선 종, 갑상선 암 뿐만 아니라 녹내장, 울혈성 심부전 및 피부 장애가 있다.
Patent KR-20020079864-A (KR)
Title: 휴대형 무선 터미널들을 통한 디바이스들의 제어를 위한인간 공학적 시스템
IPC: H04Q9/00
Filed: 2001-12-10
Abstract: 네트워크 프로토콜은 작은 무선 디바이스들이 원격 시스템들의 제어를 위해 사용되도록 허용한다. 몇몇 특징들은 대부분의 무선 디바이스들의 작은 형태 팩터에도 불구하고 빠르고 효율적인 시스템 파라미터들의 수정을 증진시킨다. 첫째로, 각각의 카드는 바람직하게 설계되어 제어 변수의 동작 상태 및 변수가 변화되도록 허용하는 제어는 동일한 카드 상에 위치된다. 둘째로, 메뉴는 구조화되어 모든 가능한 파라미터에 대한 일련의 데이터 엔트리 카드들을 통해 사용자를 강제하기 보다는, 사용자는 변화를 요구하는 파라미터만을 선택할 수 있다. 셋째로, 인터페이스는 구조화되어 제어 변수가 세팅될 때마다 사용자는 자동적으로 메뉴 구조에서 한 레벨 상위의 이전 카드로 되돌려 보내진다. 넷째로, 사용자가 변화로부터 벗어날 때 인터페이스는 한 레벨 뒤로 가도록 구조화된다. 다섯째로, 변화가 적용되고 성공적이라면, 변화가 구현된 점이라기 보다는 그것의 엔트리 점에서 제어는 변화가 구현된 것으로부터 데크로 되돌아간다. 여섯째, 문맥은 복수의 레벨들에 걸쳐 동작 상태 데이터를 디스플레이함으로써 예시된다.
Patent KR-20030007534-A (KR)
IPC: H04B13/00
Filed: 2002-02-15
Abstract: 액체를 따를 때 정보의 수수를 행할 수 있도록 한 신호 전송 장치이다.  송신기측 용기(20)의 용기 본체(201)는 도전성의 액체(402)를 보존하고 있다.  수신기측 용기(21)의 용기 본체(211)에는 데이터 수신 확인을 위한 디스플레이(306)가 설치되어 있다.  용기 본체(201)와 용기 본체(211)는 액체(402)에 의해, 소정의 임피던스로 전기적으로 접속되어 있다.  디지털 데이터가 10㎒ 정도의 캐리어로 변조되기 때문에, 전자계가 발생하고, 그 중에서도 근방 전자계 성분에 의한 귀선 (fly-back line: 404)이 발생하여 송신기측 용기(20)로부터 수신기측 용기(21)로의 통신이 가능해진다.
Patent KR-20040065353-A (KR)
Inventor: KIM JIN SU
IPC: B32B27/20
Filed: 2003-01-14
Abstract: PURPOSE: An antibiotic refrigerator using nano-silver is provided to reduce the quantity of nano-silver used for manufacturing an inner liner sheet containing nano-silver by separately forming an inner sheet containing nano-silver and an outer sheet formed of an ABS(Acrylonitrile-Butadiene-Styrene) resin. CONSTITUTION: An inner liner sheet(1) forming a storage space of a refrigerator is divided into an inner sheet(2) containing nano-silver and an outer sheet(3) not containing nano-silver, wherein the inner sheet requires an antibiotic function as a part actually contacting with foods and the human body while the outer sheet does not require the antibiotic function. The inner sheet is thinner than the outer sheet.
Patent KR-20040067191-A (KR)
Inventor: KIM HYUN KYU
IPC: A21D2/00
Filed: 2003-01-22
Abstract: PURPOSE: A multi-functional grain mixture of wheat flour, rice flour and popped rice flour and a method for manufacturing the functional food using the same grain are provided, thereby improving viscoelasticity of the grain mixture, so that the taste and flavor of functional materials can be maintained in the functional food. CONSTITUTION: The multi-functional grain mixture of wheat flour, rice flour and popped rice flour is prepared by mixing rice flour with popped rice flour of polished rice and unpolished rice in a ratio of 1:1, and mixing the rice mixture flour with wheat flour in a ratio of 5:5, wherein the mixed ratio of the rice flour, popped rice flour and wheat flour is 1.5:1.5:7. The method for manufacturing the functional food comprises adding 5 to 20 wt.% of a mixture of green tea flour, garlic powder, brown seaweed powder, and meat powder into the multi-functional grain mixture of wheat flour, rice flour and popped rice flour mixed in a ratio of 1.5:1.5:7, and manufacturing functional noodles using the mixture.
Patent KR-20040067670-A (KR)
Inventor: CHOI JUN SIK
IPC: H05B37/02
Filed: 2003-01-24
Abstract: PURPOSE: A microwave lighting apparatus and a method for diagnosing a trouble of the same are provided to diagnose easily a trouble of a lamp by coding a lamp state and transmitting a coded lamp state signal to a manager. CONSTITUTION: A microwave lighting apparatus includes a state code storage unit, a transceiver, and a controller in order to convert the microwave energy of a magnetron to the light. The state code storage unit(900) stores a normal code or an abnormal code according to an operating state of a lamp. The transceiver(800) is used for receiving a lamp state signal from a manager and transmitting the normal code and the abnormal code of the state code storage unit to the manager. The controller(600) is used for controlling a transmitting state of the normal code or a transmitting state of the abnormal code according to the lamp state signal.
Patent KR-20040070874-A (KR)
Title: High pressure plasma discharge device
Inventor: SONG SEOK KYUN
IPC: H05H1/24
Filed: 2003-02-05
Abstract: PURPOSE: A high pressure plasma discharge device is provided to satisfy various substrate process conditions by obtaining various plasma type plasma such as a normal glow plasma, abnormal glow plasma or the like. CONSTITUTION: A high pressure plasma discharge device includes a multi-pin electrode(11a), an ignition electrode(11b) and a predetermined power supplier. The ignition electrode(11b) is placed at one end of the multi-pin electrode(11a). The predetermined power supplier supplies the power by positioning the opposite multi-pin electrode(11a) and the opposite ignition electrode(11b) with separating from the multi-pin electrode(11a) and the ignition electrode(11b) on the same plane.
Patent KR-20040071358-A (KR)
Title: Sand blaster
Inventor: JOA SEONG HUN
IPC: B24C3/04
Filed: 2003-02-05
Abstract: PURPOSE: A sand blaster is provided to uniformly keep etching rate by uniformly mixing new sand powder and used sand powder. CONSTITUTION: In a sand blaster, a sand storing unit(80) has an opening/closing unit(81) connected to one side of a sand supply unit(40), and selectively supplies new sand powder to the sand supply unit. A sensor unit(70) is installed at the sand supply unit, and measures the amount of sand powder. A control unit(90) controls the opening/closing unit according to a signal output from the sensor unit. The sensor unit includes a first sensor installed at the sand supply unit, and a second sensor installed above the first sensor.