baber/WOPTO huggingface dataset:
Patent KR-19990085287-A (KR)
Title: 100 헤르츠 티브이
IPC: H04N5/44
Filed: 1998-05-15
Abstract: 편향된 수직/수평 동기신호(VS_100, HS_100) 및 시스템 클럭을 입력받아 R, G, B 신호를 생성하는 텍스트처리부와, 외부로부터 입력되는 50HZ의 Y, U, V 신호를 입력받아 100HZ Y, U, V 신호를 출력하는 디지탈 보드와, 상기 텍스트처리부에서 출력되는 R, G, B 신호와 디지탈 보드에서 출력되는 Y, U, V 신호를 입력받아 영상처리하는 비디오 처리부와, 상기 텍스트처리부에서 출력된 수평동기신호(HS_100)와, 디지탈 보드에서 출력되는 수평동기신호(HS_100)의 위상오차를 시스템 클럭에 따라 보정하는 에러정정부를 포함하여 구성된 것으로 동기를 안정화시키고 OSD 쉬프트 현상을 방지할 수 있는 효과가 있다.
Patent KR-20000000927-A (KR)
Title: Device for automatically establishing horizontal screen size of monitor
Inventor: LEE JEONG WOOK
IPC: H04N3/16
Filed: 1998-06-05
Abstract: PURPOSE: A device for automatically establishing horizontal screen size of monitor is provided to compare the currents in a deflection coil of the CRT determining the size of the horizontal screen by using a optical register, thereby automatically establishing the horizontal screen size regardless of the inputted frequency. CONSTITUTION: The device comprises: an optical register(PR1) changing internal resistance in accordance with to the current from a diode to the deflection coil; a comparator(P1) receiving and comparing reference voltage and the output voltage corresponding to the feedback resistance of the optical register and outputting the compared value; a analog-digital converter(P2) converting the analog output value compared in the comparator into digital value; a main controller(U1) discriminating and controlling the digital signal in the analog-digital converter; and a digital-analog converter(P3) converting the digital control signal in the main controller into analog signal and outputting it to a compensation controller.
Patent KR-20000002108-A (KR)
Title: Process time management method of semiconductor equipment
Inventor: KIM YONG HWAN
IPC: H01L21/00
Filed: 1998-06-17
Abstract: PURPOSE: A process time management method of a semiconductor equipment is provided to prevent process delay and process defects. CONSTITUTION: The process time management method of a semiconductor equipment comprises: a host(10) built a database that stores many data for the semiconductor process; an equipment server(20) on-line connected to the host by a TCP/IP; a semiconductor equipment(30) on-line connected to the equipment server by a SECS protocol; and a process time management module(40) on-line connected to the semiconductor equipment.
Patent KR-19990013463-A (KR)
Title: 메탈라이징용 금속페이스트 조성물
IPC: C04B35/495
Filed: 1998-06-22
Abstract: 본발명은 메탈라이징(Metalizing)용 금속페이스트 조성물에 관한 것으로서, 
     알루미나 세라믹스 접합제의 메탈라이즈용 금속페이스트 조성물에 있어서, 몰리브데늄(Mo) 44 - 68 중량 %, 텅스텐(W) 12 - 36 중량 %, 망간(Mn) 3 - 15 중량 %, 산화규소(SiO 2 ) 3 - 15 중량 %, 산화티탄(TiO 2 ) 0.5 - 2 중량 % 의 조성비를 가지고, 
     상기 텅스텐(W)의 중량은 전체조성물 중량에 대하여 12 - 36 중량 % 의 조성비를 가지는 것을 특징으로 하여; 
     본발명의 메탈라이징용 금속페이스트 조성물은 일반적인 알루미나 세라믹스의 메탈라이즈용 금속페이스트의 원료인 몰리브데늄(molybdenum, Mo)을 일정량 텅스텐(tungsten, W)로 교체하는 조성을 가짐으로서, 소결중 특별한 치구 없이도 로내 구조재 금속과의 접합이 발생하지 않게 되어 제조공정이 간편하여 지고, 또한 접합강도도 증대되는 유용성을 가진다.
Patent KR-20000003804-A (KR)
Title: Method for detecting an error of a regulator
Inventor: LEE HYUN IL
IPC: G01R31/02
Filed: 1998-06-29
Abstract: PURPOSE: A method for detecting an error of a regulator is provided, which detects an error inserting of a regulator which gets out of a rated characteristics to prevent an error operation occurrence of a microcomputer. CONSTITUTION: A method for detecting an error of a regulator comprises the steps of: (200) judging as to whether an interrupt signal is inputted; (204) starting a count of a pulse period inputted from a regulator and (210) completing a period counting of the pulse inputted from the regulator; (214) displaying use of regulator which is higher than the rated characteristics frequency; and (216) displaying use of a regulator which is lower than the rated characteristics frequency. Therefore, a product which go ahead the rated characteristics is automatically detected and displayed in a test mode and thus the error operation of the microcomputer is automatically detected to be quickly overcome.
Patent KR-20000004009-A (KR)
Title: Assistant resonator structure of air leading device for car
Inventor: KANG DONG KU
IPC: F02M35/12
Filed: 1998-06-30
Abstract: PURPOSE: An assistant resonator structure of an air leading device for a car is provided to normally perform the function of a machine by smoothly transferring air transferred through an inner air passage by a reinforcing guiding matter. CONSTITUTION: The assistant resonator structure of an air leading device is equipped:a body(20) formed an entrance(22) and an exit(24) in the front end and the rear end, and formed a reinforcing leading matter(40) in the inner air passage(26); a cover(30) connected by inserting the opened upper end of the body(20).
Patent KR-19990023207-A (KR)
Title: 엠펙 복호화기내에서의 조기 에러 검출 방법 및 그 시스템
IPC: H04N19/89
Filed: 1998-07-15
Abstract: 하나 이상의 기정의된 불법 조건에 대하여 부호화 디지탈 비디오 신호에 대한 복호화를 감시하는 MPEG 디지탈 비디오 복호화기 시스템, 방법 및 컴퓨터 프로그램 제품이 개시된다.  에러 검출 논리부는 복호화기의 가변 길이 코드(VLC) 복호화기, 역 양자화기(IQ), 역 이산 코사인 변환기(IDCT) 및 움직임 보상기(MC)에 연결되어 부호화 디지탈 비디오 신호의 복호화 동안 VLC 복호화기, IQ, IDCT 및 MC중 적어도 하나내에서의 불법 조건을 검출한다.  감시된 불법 조건은 VLC/IQ 제어 에러, IQ 레벨 오버런, IQ/IDCT 버퍼 에러, MC 유휴 에러 및 MC 매크로블럭 개시 에러를 포함할 수 있다.  에러 신호들은 복호화기의 제어 프로세서에 의해 주기적으로 감시되는 중앙 에러 레지스터로 기록된다.  제어 프로세서는 불법 조건으로 인한 시스템의 중단 이전에 복호화기 시스템내의 복구를 개시한다.
Patent KR-20000008874-A (KR)
Title: Error data detector for memory device
Inventor: HONG JUNG IL
IPC: G06F12/16
Filed: 1998-07-16
Abstract: PURPOSE: An error data detector is provided, which synchronizes to a clock according to the operating characteristic of SDRAM and accurately detecting an error data. CONSTITUTION: An error data detector comprises: a reference device socket(20) of which reference device is inserted; a test device socket(30) of which test device is inserted; a judgement unit(50) for storing a voltage different values between the data output pin of the test device socket(30) and the data output pin of the reference device socket(20) and judging the stored voltage different value; a synchronizing unit(40) for receiving the system clock signal and adjusting the judging time of the judgement unit(50); and an output unit(60) for stably outputting the judging result of the judgement unit(50). Thereby, the error data of the reference device and the test device is detected accurately and quickly.
Patent KR-20000008890-A (KR)
Title: Character input method in electric appliance
Inventor: CHOI DEOK HWAN
IPC: G06F3/02
Filed: 1998-07-16
Abstract: PURPOSE: A characteristic input method in electric appliance, eg a cellular phone is provided to form sentence easily by recording the predicate and the objective used frequently beforehand in the korean language. CONSTITUTION: In the characteristic input method, an initial consonant is chose and input by displaying a consonant row including a double consonant recorded in a memory after setting a character input mode. A medial sound is chose and input by displaying a vowel row including a double vowel recorded in a memory. a final consonant is chose and input among the displayed consonants. If a character is completed, temporary-recorded character is saved in the memory by using a save key and returns to the call standby state.
Patent KR-19990007511-A (KR)
Title: 컴퓨터 즉석 추첨식 토큰 및 티켓 자동 발매기
Filed: 1998-07-30
Abstract: 본 발명은 전자오락실에서 지폐 및 주화를 토큰 또는 티켓으로 발매하는 전자오락용 토큰 및 티켓 자동발매기에 관한 것으로, 토큰 및 티켓 발매시 숫자 맞추기 게임을 제공하여 일치된 숫자에 따라 보너스 상품을 추가로 제공하므로써 이용자의 흥미를 유발토록 하는 컴퓨터 즉석 추첨식 토큰 및 티켓 자동발매기에 관한 것이다. 
     이러한 본 발명은 지폐 및 주화 투입을 코인투입기에서 감지하여 해당 액수만큼의 토큰 및 티켓을 발매기에서 발매시키는 토큰 및 티켓 발매기에 있어서, 
     현금투입시 숫자입력을 유도하고 숫자입력을 나타내는 한편 컴퓨터 추첨결과를 나타내는 표시기와, 
     숫자입력용 숫자키와 기능선택용 기능키가 구비된 키입력기와, 
     사용자가 선택한 숫자를 내부 숫자조합과 추첨한 후 그 결과를 표시기로 표시하는 한편 추첨결과에 따라 토큰 또는 티켓을 발매하도록 제어하는 중앙처리기를 구비시킴으로서 이루어 진다.
Patent KR-19990023770-A (KR)
Title: 토너 및 화상 형성 방법
IPC: G03G9/087
Filed: 1998-08-21
Abstract: 전자사진 토너는 결합제 수지, 착색제 및 왁스를 적어도 포함한다.  결합제 수지는 (a) 폴리에스테르 수지, 비닐 수지, 및 폴리에스테르 단위 및 비닐 중합체 단위를 포함하는 혼성 수지 성분을 포함하고, (b) 각각의 용매를 사용하여 10 시간 동안 속슬레 추출한 후에 THF (테트라히드로푸란) 가용성 함유물(W1)이 50 내지 85 중량%이고, THF 불용성 함유물(W2)이 5 내지 50 중량%이며, 에틸 아세테이트 가용성 함유물(W3)이 40 내지 98 중량%이고, 에틸 아세테이트 불용성 함유물(W4)이 2 내지 60 중량%이고, 클로로포름 가용성 함유물(W5)이 55 내지 90 중량%이고, 클로로포름 불용성 함유물(W6)이 10 내지 45 중량%이고, W4/S6의 비율이 1.1 내지 4.0이고, 분자량 범위 500 내지 1×10 4 미만의 성분 35.0 내지 65.0 % (A1), 분자량 범위 1×10 4 내지 1×10 5 미만의 성분 25.0 내지 45.0 % (A2) 및 분자량 범위 1×10 5 이상의 성분 10.0 내지 30.0 % (A3)를 포함하고, 1.05 내지 2.00의 A1/A2 비율을 제공하는 분자량 범위 4000 내지 9000에 주 피크를 나타내는 GPC(겔 투과 크로마토그래피) 크로마토그램을 제공하는 THF 가용성 함유물을 함유한다.  상기 결합제 수지는 왁스 및 착색제의 우수한 분산성을 나타낸다.
Patent KR-19990029349-A (KR)
Title: 반도체 장비의 공기 유입장치 및 이를 이용한 화학물 오염 제거방법
IPC: B01D53/04
Filed: 1998-08-26
Abstract: 오존과 같은 화학물 오염이 반도체 장비로 유입되는 것을 억제할 수 있는 반도체 장비의 공기 유입 장치에 관하여 개시한다.  본 발명에 의한 반도체 장비의 공기 유입장치는 공기 흡입 수단인 팬과, 탄소로 이루어진 활성탄을 몸체로 하는 화학필터로 이루어지며 외부에서 유입되는 공기중의 화학물 오염 성분을 제거한다.  이러한 반도체 장비의 공기 유입장치는 공기중의 파티클과 같은 입자오염 성분을 제거하기 위한 제1 및 제2 필터가 추가로 구성될 수 있다.  따라서 본 발명에 따른 반도체 장치의 공기 유입 장치를 자연산화막(native oxide layer)에 민감한 공정, 예컨대 HSG 형성 공정에 쓰이는 CVD 장비에 설치하면 오존의 농도를 떨어뜨려 높은 커피시턴스를 얻을 수 있다.
Patent KR-20000019034-A (KR)
Title: Magnetic engine
Inventor: CHANG CHUNG KHUN
IPC: H02K53/00
Filed: 1998-09-08
Abstract: PURPOSE: A magnetic engine is provided to be replaced with an existing engine and prevent gas leak caused by explosion of a gas tank owing to a traffic accident. CONSTITUTION: A magnetic engine comprises a hollow case(15), a first bearing (52) inserted into an axis hole of the hollow case, a lower disk(1) installed on the first bearing, a torsion disk(2) installed on the lower disk, an upper disk(4) installed on the torsion disk, a second bearing (64) installed on the upper disk, a cover disk(6) installed on the second bearing, a gear wheel(65) installed on the cover disk, a third bearing (67) installed on the gear wheel, and a shaft where the first bearing, the torsion disk, the upper disk, the second bearing, the cover disk, the gear wheel, and the third bearing are penetrated.
Patent KR-20000019455-A (KR)
Title: Radio transceiver for transmission diversity using power control command
Inventor: KU JOON MO
IPC: H04B7/02
Filed: 1998-09-11
Abstract: PURPOSE: A radio transceiver for a transmission diversity using DS(Direct Spread)/CDMA selects a transmission path of a base station by using a power control command transmitted from a mobile station, thereby enhancing a transmission quality of a base station.. CONSTITUTION: A radio transceiver includes a signal receiving processor(462) for dividing a power control signal from a received signal; a first signal transmitter for controlling a signal power according to the power control signal, and transmitting the signal power to the mobile station through a selected transmission path; a transmission path controller(463) for controlling a transmission path of a signal transmitted to the mobile station; a demodulator(461) for demodulating a signal received from the first signal transmitter; a power control signal generator(468) for receiving an output signal of the demodulator, and providing the power control signal; and the second signal transmitter for loading the power control signal to the base station. Thereby, a transmission quality of a base station is enhanced.
Patent KR-20000019594-A (KR)
Title: Method for changing channel of television
Inventor: PARK HONG SIK
IPC: H04N5/45
Filed: 1998-09-14
Abstract: PURPOSE: A method for changing channel of a television is provided to control both a channel and a volume of both a main screen and a sub-screen at the same time. CONSTITUTION: A method for changing channel comprising the steps of: checking that a control signal corresponding to one among the numbers of channel changing key(11,12,15,16) and numbers of volume changing key(13,14,17,18) is inputted from a remote controller(10) having many channel changing key and many volume changing key; discriminating whether the control signal corresponds to one among the many of channel changing key and the many volume changing key or not; and then discriminating whether current mode of a television (1) is double screen mode or not; and adjusting selectively one of the channel and the volume of the main screen and the sub-screen corresponding to the many channel changing key and many volume changing key in the case that the current mode of the television (1) is double screen mode.
Patent KR-20000020309-A (KR)
Title: Static random access memory and method for fabricating the same
Inventor: LEE NAM YOUNG
IPC: H01L27/11
Filed: 1998-09-19
Abstract: PURPOSE: A method for fabricating a static random access memory is provided to strengthen a forward diode characteristic by changing a parasitic P+/N+ structure into a P-I-N structure. CONSTITUTION: An interlayer insulating film(13) is formed on a semiconductor substrate which has a TFT SRAM cell structure of a P-I-N structure that an intrinsic silicon layer is intervened between a P+ drain region and an N+ active layer node. A first contact region is formed by selectively etching the interlayer insulating layer so as to expose a part of the substrate. After forming a first silicon layer on an entire surface of the substrate, an intrinsic silicon is deposited on the first poly silicon layer. An N+ poly silicon layer(12) is formed by implanting an N-type impurity of a high concentration at the intrinsic silicon layer corresponding to the other except the first contact region. A gate oxide film(17) is formed on the entire surface of the substrate. A second contact region is formed by selectively removing the gate oxide film so as to expose the intrinsic silicon layer. After forming a second poly silicon layer on the entire surface of the substrate, TFT source and drain(18) are formed by selectively implanting a P-type impurity of a high concentration at a part of the second poly silicon layer.
Patent KR-20000020479-A (KR)
Title: Stack package
Inventor: CHO SUN JIN
IPC: H01L23/28
Filed: 1998-09-21
Abstract: PURPOSE: A package is provided which makes stable electric connection and has a low manufacturing price by using a substrate on which circuits are formed in stead of lead frame. CONSTITUTION: On both sides of a plastic substrate, upper and lower metal interconnecting layers are attached. Lower thermosetting resin having slot in its mid portion is attached to bottom surface of the lower metal interconnecting layer. On the bottom surface of the lower thermosetting resin, metal interconnecting layer is attached. Via holes are formed on the substrate. Both inner wall of the via holes and top and bottom metal interconnects are coated by conductive metal to electrically connect respective metal interconnecting layer. An upper semiconductor chip(10) is attached to middle top part of upper thermosetting resin between metal interconnecting layers whereas a lower semiconductor chip(20) is attached to lower part of that by a boding agent(60), these chips being connected to each metal interconnecting layer by a metal wire(70). By sealing agent, all of the top part are molded and the portion between the metal interconnecting layer is also molded. A solder ball(90) mounted to the substrate is attached to bottom surface of lowest metal interconnecting layer exposed to downwards from the ball agent.
Patent KR-20000026302-A (KR)
Title: Mini-bar refrigerator having non-refrigerating chamber
Inventor: CHO SEONG
IPC: F25D11/00
Filed: 1998-10-20
Abstract: PURPOSE: A mini-bar refrigerator having a non-refrigerating chamber is provided to offer various foods to a user by keeping foods not requiring refrigeration and to enlarge the usable space by using one refrigerator. CONSTITUTION: A mini-bar refrigerator is composed of a refrigerating chamber(12) keeping foods requiring refrigeration such as alcoholic drinks or soft drinks and a non-refrigerating chamber(13) keeping foods not requiring refrigeration such as candy, snacks, or chips. A packing(11a) of a partition(11) is provided to cut off the inflow of cool air in the refrigerating chamber into the non-refrigerating chamber by being stuck to a door(14) if a user closes the door such that the foods requiring refrigeration and not requiring refrigeration can be kept separately. When a user desires a non-refrigerated food, the user can take out the food by opening the door after confirming the food via a view window. Thereby, the selection and taking out of the foods are easy according to the partitioned non-refrigerating chamber.
Patent KR-20000027103-A (KR)
Title: Producing method of shrinking metal mold during preparation of roll bending for middle shell in rotary type compressor of air conditioner
Inventor: LEE YEONG JE
IPC: B21D5/00
Filed: 1998-10-27
Abstract: PURPOSE: A producing method of a shrinking metal mold is provided to improve the circularity of semi-section shape inner and outer faces of a metal mold itself and the durability of the metal mold, to simplify a processing process and to improve the processing preciseness of shrunken shell. CONSTITUTION: A producing method includes a dividing and processing step, a heat-processing step, a cutting step and a combining and processing step. As time goes by, the shrinking process is equalized by improving constancy of a size after processing since the remaining stress caused by dividing and cutting does not remain because it is roughly cut, heat-processed, combined and rightly cut in the final size in a state of being divided. In addition, a defect can be minimized, and the circularity of the finally produced middle shell is improved.
Patent KR-20000027890-A (KR)
Title: Pager using car audio system
Inventor: LEE JEONG SEOK
IPC: H04B5/04
Filed: 1998-10-29
Abstract: PURPOSE: A pager using a car audio system is provided to output a warning sound through a speaker of car audio system and to display a paging number, when a pager beeps while a driver is driving a car. CONSTITUTION: A pager using a car audio system comprises a receiver(100), a voice adjuster(200), a filter(300), a paging signal receiver(400), a micom(500), an amplifier(600), a speaker(700), and a displayer(800). The receiver(100) outputs a voice signal by receiving an RF(Radio Frequency) signal, received through an antenna(2000) so that a car audio system can inform to a driver when a pager beeps while driving a car. The voice adjuster(200) adjusts the size of the voice signal by receiving the voice signal. The filter(300) outputs a requiring band signal by receiving the RF signal. The paging signal receiver(400) outputs a paging signal by receiving the outputted signal in the filter(200). The micom outputs a control signal by receiving the outputted signal in the paging signal receiver(400). The amplifier(600) amplifies the voice signal outputted from the voice adjuster(200) and the paging signal outputted from the micom(500). The speaker outputs a voice or a warning sound by receiving the outputted signal amplified in the amplifier(600). The displayer(800) displays a paging number so that a driver can know he paging number, by receiving the outputted control signal from the micom(500).
Patent KR-19990037566-A (KR)
Title: 인-플레인 스위칭형 액정 표시 장치 및 그 조작 방법
IPC: G02F1/13357
Filed: 1998-10-31
Abstract: 제1 및 제2 투명 기판(3a,3b)과, 상기 제1 투명 기판(3a) 상에 모두 형성되는 화소 전극(4) 및 공통 전극(5)과, 상기 제1 및 제2 투명기판(3a,3b) 사이에 삽입된 액정층(8)과, 상기 제1 투명기판(3a)을 통해 배면광(backlight)을 발광시키는 배면 광원(1)과, 전극(4,5)에 전압을 인가하여 이들 사이에 전계를 발생시키고, 액정 분자(6)의 배향을 조절하도록 전압을 제어하는 전압제어기(15)를 포함하고 있는 인-플레인 스위칭형 액정 표시 장치(in-plane switching type liquid crystal display)가 제공되며, 이 장치는 표시 불균일이 눈에 띄지(inconspicuous) 않도록 배면광의 색도를 제어하는 색도 제어기(16)를 포함하고 있다.
Patent KR-20000032422-A (KR)
Title: Method for controlling overload to operator terminal of full electronic exchange
Inventor: HEO SAM MUN
IPC: H04Q1/20
Filed: 1998-11-14
Abstract: PURPOSE: A method for controlling overload to operator terminal of a full electronic exchange is provide to stably process a command language of a full electronic exchange by controlling a transmitting and receiving function of data between an operator matching system and an exchange when overloading of the exchange. CONSTITUTION: An overload state detecting process(30) detects an overload state of a full electronic exchange. An operator matching management process(32) manages an operator matching system connected to the full electronic exchange. A command language input processing process(42) processes a command language inputted from the operator matching system. A command language analysis process(34) analyzes a command language inputted from the command language input processing process(42). A command language performing process(36) performs a performing state and a performing request to an inputted command language. A command language result process(38) converts a result to a corresponding command language into a data shape in which an operator can view. A command language result screen process(40) performs a screen output control to a command language performing result.
Patent KR-20000033007-A (KR)
Title: Probes used for detecting 16s rrna of edwardsiella tarda and preparation method multimer probe
Inventor: SIM DU SAENG
IPC: C12Q1/68
Filed: 1998-11-19
Abstract: PURPOSE: A preparation method of probe and probe sequence is provided which is specific for 16S rRNA of E. tarda. CONSTITUTION: PCR primers based on consensus 16S rRNA sequence of eubacteria are used to amplify part of 16S rRNA sequence of E. tarda. PCR product is digested with EcoRI and PstI and cloned into pUC18. Restriction analysis reveals that PstI, HinDIII, and SmaI sites are existed with 16S rRNA specific EcoRI site. Nucleotide sequence of cloned PCR product is determined. Nucleotide sequences of other pathogenic bacteria and E. tarda are compared and E. tarda specific sequence is selected for the probes. One of probe shows sequence similarity with those of Yersinia rocker, Aeromonas sobria, Vibrio angel arum, Vibrio oral, Pasteurella canis, and Staphylococcus epidermis but the other probe does not show any sequence similarity. Multimeric probes having triple repeat of each probes or mixed repeat of each probes are used for slot-blot hybridization. Cross hybridization of one probe is decreased by multimeric probes and sensitivity of multimeric probes is increased.
Patent KR-20000038302-A (KR)
Title: Structure of damping gas of vent valve assembly
Inventor: JEONG WON HYEON
IPC: F16K25/00
Filed: 1998-12-05
Abstract: PURPOSE: A structure of damping gas of a vent valve assembly is provided to minimize noise and vibration occurring when a vent valve returns to the front end face of a cylinder by using gas vented to a venting space. CONSTITUTION: By backing up a piston(1), new coolant gas is flowed via a coolant passage(1a) of the piston and then flowed into a compressing space(S1) by opening a suction valve(3) installed in the front face of the piston. When the piston moves forward, the coolant gas is compressed by being pushed by the piston and flowed into a venting space(S2) of vent covers(110) while pushing vent valves(120) at a certain point of time. When the piston backs up, the compressing space is in low pressure state compared to the venting space and the vent valves returns to the front end face of a cylinder(2) by the returning force of valve springs(130). Thus, the compressing space is divided from the venting space. A portion of gas flowing into the venting space from the cylinder is flowed into a gas residual groove of the cylinder or the vent valve and is stagnated in the groove. The stagnated gas generates buffering force on the front end face of the cylinder when the vent valve returns. The shock between the cylinder and the vent valve is buffered.