Abstract: A flexible drive shaft extension for hand tools comprises serially nested, socket-ended Shaft components of polygonal cross-section which have freedom of universal motion from axial alignment limited to about five degrees of arc and which are forcibly retained in coupled connection within a sleeve by spring biasing.

Abstract: A bit receiving device includes a shank having a first polygonal recess in for receiving a bit therein. A second polygonal recess is defined in a second end of the shank for receiving an extension rod therein. A chamber is longitudinally defined in the shank and a flange extends inward from an inner periphery of the chamber. The chamber has an inner diameter which is larger than an inner diameter defined by the flange. A rod is movably received in the first chamber and a magnetic member is connected to a first end of the rod. A second end of the rod is an enlarged end which is stopped by the flange when the rod is extended from the first polygonal recess.

Abstract: An anti-skip fastener tightening and/or extraction device 10 includes a tool bit end 12 having a plurality of flutes or crossing members 13-16, each crossing member having at least one recess 18 and 26 positioned in a side wall 20,21,28 and 29. The recesses 18 and 26 form edges 36 and 42 that engage corresponding portions of a fastener 17 to maintain engagement between the tool bit end 12 and the fastener 17 when forcibly rotating the fastener 17 to drive the fastener 17 into a workpiece or forcibly rotating the fastener 17 to extract the fastener 17 from a workpiece.

Abstract: A new tire changing aid to allow a person who has a flat tire to apply added leverage when removing and/or tightening the lug nuts. It also converts to a tire lift with foot leverage to help lift the spare tire back up onto the vehicle's axle. This innovative device is built of steel tubing bent 180 degrees with rubber mounts that have four adjustable and removable plates with holes to match the particular vehicle's lug bolt pattern that the lug wrench rests in. With the steel tubing inserted over the opposing end of the lug wrench it gives the user four times more leverage to remove the lug nuts.

Abstract: In accordance with the present invention a cast or machined housing contains a drive system for turning a rotating cutter. An external source of rotation is attached to the housing. This external source can be a commercially available tool, such as a Craftsman angle grinder, or any rotating source of power provided by electric, hydraulic, or pneumatic means.

Abstract: A correction apparatus 1 comprises a correction amount setting section 3 and a correction execution section 4 and provides in an NC lathe 100 equipped with a first tool rest 106 and a second tool rest 108 which are movable in the X-axis direction and in the Z-axis direction. The correction amount setting section 3 sets correction amounts for canceling the displacement of the second tool rest 108 in the X-axis direction caused depending on the position of the first tool rest 106 in the Z-axis direction and for canceling the displacement of the first tool rest 106 in the X-axis direction caused depending on the position of the second tool rest 108 in the Z-axis direction. The correction execution section 4 corrects movement target position data regarding the first tool rest 106 and the second tool rest 108 in the X-axis direction on the basis of the correction amounts.

Abstract: A method and apparatus are taught for cutting a sheet material comprising the steps of engaging a first side of the laminated web structure with a crack initiator having a high rake angle, the crack initiator extending from a first cutter base having a low rake angle; simultaneously engaging a second side of the laminated web structure with a second cutter; generating a first crack in the first side of the laminated web structure with the crack initiator; generating a second crack in the second side of the laminated web structure with the second cutter; and propagating the first crack and the second crack to intersect. The crack initiator extends from a cutter base to a height of at least 5 &mgr;m. The high rake angle of the crack initiator is in the range of from about 30° to about 70°. The cutter base has a low rake angle that is at least about 15° less than the high rake angle of the crack initiator.

Abstract: A die and method of gang punching selective holes in thin sheet materials such as greensheets are provided in which slugs of greensheet material formed during the punching operation easily fall through the die and are removed. The die uses a number of plates one of which is a window plate having openings correspond to openings in a die plate disposed thereon. The window plate openings have a larger diameter than the die plate openings and also a plurality have an oval shape which oval shape openings provide less resistance to the falling slugs and facilitate removal of the slugs from the die. The window plate also preferably has a central grid open area with the remainder of the plate having vertical through-holes corresponding to the through-holes of the die plate. The die also preferably employs a die plate made from at least two sheets of material, i.e.

Abstract: A decorative shredded material having a complete pattern contained on each strip or piece of the decorative shredded material. Methods for making decorative shredded material.

Abstract: The invention relates to a method comprising the following steps: a stack of sheets is moved under a blade in order to cut a first free strip of the stack of sheets; the first strip is cut; the stack of sheets is subsequently moved, whereupon it executes a first rotation and is guided under the blade once again in order to cut a second free strip; the second strip is cut; the stack is subsequently moved, whereupon it executes a second rotation and is guided under the blade once again in order to cut a third free strip; the third free strip and successive stacks of bond paper strips are cut, and; the successive stacks of bond paper strips are cut into individual bond papers.

Abstract: A machine such as a saw, jointer, planer, etc. is disclosed. The machine has cutting tool, a direct drive mechanism configured to move the cutting tool, a detection system adapted to detect the occurrence of an unsafe condition between a person and the cutting tool, and a reaction system adapted to mitigate the unsafe condition upon the detection of the unsafe condition by the detection system. An electrical signal is imparted on the cuffing tool, and the signal is used to determine the occurrence of the unsafe condition. The direct drive mechanism is electrically isolated so that the electric signal may be imparted on the cutting tool. The electric isolation may be achieved through configurations such as insulated bearings, a substantially non-conductive housing, and a substantially non-conductive coupling joining two shaft portions.

Abstract: A cutting table for cutting pieces of fabric. The table has a fabric supporting surface mounted on a frame. A cutter is manually movable along a linear cutting path that is substantially perpendicular to an edge guide. First and second light emitting devices emit respective first and second lights in a direction substantially parallel to the linear cutting path. A manually powered drive supports the first and second light emitting devices in a spaced apart relationship, and the drive is manually operable to move the light emitting devices through equal displacements in opposite directions substantially perpendicular to the linear cutting path. The light emitting devices are used to quickly align the fabric, so that it can be cut to a desired width.

Abstract: An electric punch for automatically punching holes in documents and the like is provided that allows the spacing between the holes to be selectively set at either 70 mm (U.S. standard) or 80 mm (European and Japanese standard) by forming a bend midway of the length of operating arms of respective perforating members so that forward and rearward portions of the operating arms are laterally offset in parallel by a prescribed distance and clamping the operating arms with two supports of different width, thereby enabling the punched hole spacing to be selectively changed by exchanging the left and right perforating members.

Abstract: A cutter guard device is adapted for use in a belt saw machine, and includes a stationary hinge leaf formed with a first knuckle unit, a movable hinge leaf formed with a second knuckle unit, and a hinge pin extending through the first and second knuckle units, thereby permitting rotation of the movable hinge leaf between cutter concealing and cutter exposing positions. The movable hinge leaf is further slidable along the hinge pin between retaining and pivoting positions. The movable hinge leaf is movable between the cutter concealing and cutter exposing positions when disposed in the pivoting position on the hinge pin. A retention unit retains releasably the movable hinge leaf in the cutter concealing position when the latter is further disposed in the retaining position on the hinge pin.

Abstract: First and second rotating units (110, 120) include a pair of rotors (111, 121) opposing each other, a spindle (113, 123) provided between the pair of rotors, and an impacting body (130, 140) mounted rotatably on the spindle (113, 123). The impacting body (130, 140) is mounted so that a predetermined fitting gap is provided between the impacting body and the spindle and a part of a periphery of the impacting body can be positioned beyond a periphery of the rotor. The impacting bodies of the first and second rotating units impact on an object to be processed sequentially while the rotating units are rotated at a high speed, thereby cutting the object to be processed. A cutting depth by the impacting body of the second rotating unit is larger than that by the impacting body of the first rotating unit, and the impacting body of at least one of the rotating units impacts on the object to be processed at least at a critical impact velocity.

Abstract: A cutting disc core for a circular shaped saw blade which has a circular shaped body which has a center hole and a circular peripheral edge upon which is to be mounted a plurality of spaced apart cutting segments that is to perform the cutting of the saw blade. Surrounding the center hole and formed within the body are a plurality of slits with there being a solid tab that is integrally connected to the body located between each directly adjacent pair of slits. The tab constitutes a frangible seal with the circular ring or bushing which is formed about the center hole to be removable by being forcibly physically separated from the body.

Abstract: In a piano that includes an action frame and a sostenuto rod bracket, the sostenuto rod bracket being adapted to accommodate a sostenuto rod, an improvement involving the attachment of the sostenuto rod bracket to the action frame. Increased access to the sostenuto rod bracket can be facilitated simply by detaching the action stack bracket from the action frame.

Abstract: The present invention provides a device for generating callused skin on a fingertip of a user while simultaneously providing an individual finger and overall hand exerciser. The device forms an exposed upper surface area having a raised ridge or a series of raised ridges extending the length of the upper surface area. Grooves transect each ridge, forming a crest extending perpendicular to the length of the ridge. A series of grooves are provided along the length of the raised ridge and the overall upper surface area simulates a string of a stringed instrument.

Abstract: A keyboard instrument such as an electronic piano comprises a keyboard structure that is basically identical to the keyboard structure of an upright piano except hammer assemblies and a struck portion attached to an action bracket. Each of the hammer assemblies is constituted by a hammer shank and a pseudo hammer, one of which is used to strike the struck portion having a multilayer structure including an elastic member (e.g., a plate spring) sandwiched between buffer materials. The elastic member has a prescribed number of striking areas in correspondence with keys arranged on a keybed, wherein the striking areas are gradually increased in weights and bends (or deflections) in a pitch descending order from higher pitches to lower pitches. Thus, it is possible to simulate weight factors and bends (or deflections) of strings actually struck by hammer felts in an upright piano.

Abstract: A CPU 31 reads out musical tone control information such as tone color data and effect data from an external storage device 35 or retrieves it via an interface circuit 51. The CPU 31 supplies the musical tone control information to a tone generator 41 and an effect circuit 42 in order to control the tone color of a musical tone signal and the effect added to the signal, using the musical tone control information. When the musical tone control information is not applicable to the tone generator 41 and the effect circuit 42, the information is substituted by musical tone control information applicable to the tone generator 41 and effect circuit 42 and stored in a ROM 33 for the use later on. On a display unit 13 there is displayed the name of substituted tone color data or effect data with information that a substitution has been made.

Abstract: An electronic musical instrument A automatically performs a music piece by replaying music piece data. When music piece data stored in an external storage device 36 or music piece data taken in via an interface circuit 51 is stored in an internal storage device 35, filenames of copyrighted music piece data among the above-described music piece data are automatically changed. When music piece data stored in a ROM 33 or the internal storage device 35 is copied into the external storage device 36 or is outputted to the outside via the interface circuit 51, the copy and the output of copyrighted music piece data among the above-described music piece data is prohibited. When an external device 52 requests the electronic musical instrument A to transmit music piece data stored in the internal storage device 35 or the like, filenames of copyrighted music piece data among the above-described music piece data are protected from being displayed on the external device 52.

Abstract: A waveform reproduction apparatus and process for carrying out waveform reproduction without delays. Waveform data expressing first and latter half portions of a musical tone waveform are stored on a storage device. In response to a tone generation start indicator, waveform data that express first half portions corresponding to the tone generation start indicator are successively read out and corresponding musical tone waveforms are formed. Following this, the waveform data that express latter half portions corresponding to the tone generation start indicator are successively read out and corresponding musical tone waveforms are formed.

Abstract: Systems and methods for creating, modifying, interacting with and playing music are provided, particularly systems and methods employing a top-down process, where the user is provided with a musical composition that may be modified and interacted with and played and/or stored (for later play). The system preferably is provided in a handheld form factor, and a graphical display is provided to display status information, graphical representations of musical lanes or components which preferably vary in shape as musical parameters and the like are changed for particular instruments or musical components such as a microphone input or audio samples.

Abstract: An electronic organ 1 and a personal computer 2 are connected with a MIDI cable. The personal computer 2 is connected to a server 4 via a communication network 3. The personal computer 2 downloads a controlling program from the server 4. The electronic organ 1 is set to be a listening trial mode by an operation of the personal computer 2. In the listening trial mode, an output of a data in a temporally storage area is prohibited. The server 4 provides a first encoded performance data to the personal computer 2, and the personal computer 2 decodes the received first encoded performance data. The electronic organ 1 generates a key, and the personal computer 2 secondary encodes the performance data with the key and transmits it to the electronic organ 1. The electronic organ 1 deletes the data stored in the temporally storage area after the listening trial.

Abstract: An ensemble system reproduces a performance on an automatic player piano expressed by a set of MIDI music data codes in ensemble with another performance recorded in a compact disc in the form of audio data codes; the ensemble system firstly determines the pitch of the fundamental tone produced through vibrations of a string, then searching the audio data codes for a corresponding tone, calculating a ratio between the pitch of the fundamental tone and the pitch of the corresponding tone, and determining a data read-out speed for the audio data codes; while the MIDI data codes are being supplied to the automatic player piano, the audio data codes are transferred to a speaker system at a speed equal to the product between the standard speed and the ratio so that the piano tones are well harmonized with the electronic tones.

Abstract: In a memory of a communication setting apparatus, there is stored communication setting information that collectively predefines a plurality of communication condition parameters corresponding to a communication mode. The plurality of communication condition parameters are intended to set whether a plurality of kinds of tone performance data (e.g., tone performance data based on operation on a keyboard and tone performance data based on an automatic performance) and control data (e.g., tempo clock data) should be transmitted or received. When a user has selected a communication mode by operation of a predetermined switch, the communication setting information corresponding to the selected communication mode is read out from the memory, and tone performance data and/or control data are set to condition for transmission or reception in accordance with a plurality of communication condition parameters defined by the communication setting information.

Abstract: There is provided an electronic musical apparatus that is capable of providing listenable performance by using data reflecting the intention of the user among usable data, as well as a program for electronic music. A tone generator device is capable of sounding musical tones based on data representing preset musical tone control information or user musical tone control information.

Abstract: There is provided an electronic keyboard musical instrument that gives the performance feeling closer to that given by an acoustic piano and enables techniques of expression closer to those used when playing the acoustic piano. Touch information is generated based on first information output when an ON event of a first (deep) SW of a switch section occurs, and a tone generator section generates a musical tone according to the touch. When an OFF event of a third (shallow) SW of the switch section occurs during key release, the musical tone being generated is progressively damped, and at the same time a musical tone having a predetermined characteristic is generated. The OFF event of the third SW is made equivalent to a damper-leaving position in a key stroke of an acoustic piano keyboard.

Abstract: An electric percussion unit and small-sized speakers are detachably connected to a trunk of an electric frame guitar, and a circuit board, on which electric circuit components required for generating tones and percussion sound are mounted, and a battery unit are housed in the trunk; while a guitarist is playing a flamenco on the electric frame guitar, the guitarist beats the percussion unit with his or her hand or finger nails, and the guitar tones and percussion sound are radiated from the small-sized speakers; the electric frame guitar system is available for a wide variety of music genres, and the portability is enhanced.

Abstract: A method of suppressing shrapnel ejection inherent with fragmentary and shrapnel munition destruction. The present invention utilizes a method of imploding an initiating explosive onto the munition device whereby the munition device is exploded. The method has the counterbalancing effect between the explosion and the implosion, thus controlling and drastically decreasing the quantity, velocity, and kinetic energy of the resultant shrapnel ejection. An alternate embodiment of the present invention utilizes a combination of a cylindrical container with the wrapped munition device. The munition device to be destroyed is wrapped with flexible explosive material and placed into the cylindrical container and the resultant void space between the container walls and the munition is filled with pourable or fluid explosive material. Upon detonation of the flexible explosive material and fluid explosive material, an implosion and simultaneous chain reaction occurs whereby detonating the munition device itself.

Abstract: A rotary power device of the swinging piston type has a cylindrical rotor mounted between internal and external portions of a stator. The internal stator provides intake and exhaust channels and may hold an igniter. The external stator includes two axially adjacent cam tracks with diametrically opposed eccentricities with respect to the axis of rotation. The rotor includes two axially spaced sets of sector-shaped compartments arranged at equal angular intervals around the inner stator, where each set is axially aligned with a respective cam track. Each compartment is open at the periphery of the rotor and has an inner opening aligned with ports in the internal stator. A sector-shaped piston mounted in each compartment pivots about an axis at one vertex of the compartment. Each piston includes a roller follower for engaging the respective cam track as the rotor rotates.

Abstract: A fluid-pressure actuated piston/cylinder assembly having a sensor capable of reading at least one indicia marking on a piston rod in order to determine the movement and specific location of the piston rod and cylinder relative to each other. The sensor is housed within a sealing gland that is incorporated into the piston/cylinder assembly and is isolated from the internal fluid pressure and external elements. A method for determining the exact location of one of a piston rod and cylinder, relative to the other, is also set forth.

Abstract: A variable displacement compressor has a drive shaft, a rotor supported by the drive shaft, a drive plate supported by the drive shaft and a hinge mechanism located between the rotor and the drive plate. The hinge mechanism includes a cam, which is located on the rotor, and a guide portion, which is located on the drive plate. The cam has a cam surface, which has a predetermined profile. One of the cam surface and the guide portion slides against the other in accordance with inclination of the drive plate. The guide portion traces a path corresponding to the profile of the cam surface with respect to the cam. The path includes a first path corresponding to a small displacement region of the compressor and a second path corresponding to a large displacement region of the compressor. The profile of the cam surface is determined such that the first path and the second path bulge in a direction opposite to each other to compensate for fluctuation of a top dead center position of the piston.

Abstract: The invention relates to a method of separating one or more components from a multi-component gas stream comprising at least one non-acid gas component and at least one acid gas component. A multi-component gas stream at a pressure above 1,200 psia (82.8 bar) and a temperature above 120° F. (48.9° C.) with the concentration of at least one acid gas component in the gas stream being at least 20 mole percent is passed to a membrane system that selectively separates at least one acid gas component from the multi-component gas stream as a permeate stream. The permeate stream has a pressure of at least 20% of the pressure of the feed pressure.

Abstract: A gas particle partitioner (GPP) removes particles from an aerosol with high efficiency and with no or minimum changes to the thermodynamic conditions and chemical composition of the gas phase of the aerosol. A permeable grid electrode surrounds a corona wire and separates an interior corona discharge area from an exterior aerosol charging zone. A particle free fluid washes the corona discharge area to minimize any transport of gas components produced by corona discharge to the aerosol. The charged particles in the aerosol are deflected by an electric field in the fractionator to selectively produce a particle free sample stream, which is then separated by a flow splitter from the aerosol.

Abstract: An adsorbent and a process are disclosed for drying gases in a pressure swing dryer. The adsorbent comprises a pre-formed alumina particle having a surface area of about 250 to 550 m2 &mgr;g with a thin layer of colloidal silica disbursed on the surface of the pre-formed alumina particle. Surprisingly the thin layer of colloidal silica does not interfere with the drying properties of the pre-formed alumina particle, while significantly improving the physical properties of the pre-formed alumina particle.

Abstract: The present invention provides apparatus and methods for separating fluid components. In preferred embodiments, the apparatus and methods utilize microchannel devices with small distances for heat and mass transfer to achieve rapid cycle times and surprisingly large volumes of fluid components separated in short times using relatively compact hardware.

Abstract: Subterranean gases are removed from a building site by drawing air from ambience and passing the air through an air permeable bed of materials (10) located at the site as a diffused air stream. The subterranean gases become entrained in the diffused air stream which is then exhausted from the bed and removed from the site. A system for practicing the method has slotted air injection conduits (12) interspersed between slotted air extraction conduits (15) embedded in an air permeable bed of materials beneath the building. The system has means (18) for drawing air from the extraction conduits and removing it from the site.

Abstract: A composition of and a method of making high performance mixed matrix hollow fiber membranes is described. The membranes have a high resistance to plasticization by use of a predetermined amount of crosslinking. The preferred polymer material for the membrane is a polyimide polymer contineous phase comprising ester crosslinks and a molecular sieve material dispersed within the polymer contineous phase. The resultant mixed matrix hollow fiber membrane exhibits a high permeability of CO2 in combination with a high CO2/CH4 selectivity. Another embodiment provides a method of making the mixed matrix hollow fiber membrane from a monesterified polymer followed by final crosslinking after hollow fiber formation.

Abstract: Disclosed is an air purification device with oxygen-supplying function, in which air in an automobile is sucked by a vacuum pump and purified by a dust collector or an adsorbent such as activated carbon and zeolite, and oxygen is enriched in air to supply oxygen enriched air into the automobile. The air purification device enriches oxygen in air according to a VSA (vacuum swing adsorption) process using a difference between pressure in the adsorption bed and atmospheric pressure, in which nitrogen adsorbed into the adsorbent is released using the vacuum pump. The air purification device comprises an air filter for removing impurities from air sucked from an inside of the automobile by the vacuum pump, an adsorbent for adsorbing nitrogen from air passing through the air filter and passing oxygen, an oxygen tank for storing oxygen supplied from the adsorbent and releasing oxygen using a vacuum, and if necessary, an anion generator or a scent generator.

Abstract: An adsorbent unit including first and second porous containers, adsorbent in the first and second porous containers, a first and second end on each of the first and second containers, a yoke connecting the first ends, spaced first apertures in the yoke, a severance in the yoke extending between and in communication with the first apertures, a tab on each of the second ends of the first and second porous containers, and a second aperture in each of the tabs.

Abstract: An outwardly projecting air purifier comprising a support, a generally cylindrical array of UV lamp assemblies mounted to the support, wherein each the UV lamp assembly comprises a reflector having a generally parabolic inner surface and a UV lamp so mounted to the reflector that the inner surface of the reflector reflects a portion of the ultraviolet radiation emitted by the lamp in an outward, radial, direction is described herein. The air purifier also includes a convex shaped deflector element so mounted to the support that the airflow is deflected by the deflector element and brought near the lamps.

Abstract: A device for heating and frothing a beverage, the device including an elongate frothing wand includes a generally tubular external sleeve, an inner core within the external sleeve, wherein the inner core defines a steam conduit configured to pass steam from a supply end of the frothing wand to an expulsion end of the frothing wand, a steam-discharge ring in fluid communication with the steam conduit and configured to eject steam into the beverage, an annular airway defined by the external sleeve and the inner core, wherein the airway is configured to draw air from the supply end to the expulsion end of the frothing wand, and an air-discharge ring in fluid communication with the airway and concentrically aligned with the steam-discharge ring, wherein the air-discharge ring is configured to direct air into the beverage upon ejection of steam from the steam-discharge ring.

Abstract: A dual bowl ice cream maker and method for selectively driving one or two mixing bowls, each mixing bowl in a separate mixing compartment, without requiring manipulation of either mixing bowl.

Abstract: A continuous process for separating components of flaxseed is described. Flaxseed is dried to a moisture content of about 1% or less, after which is introduced into a separation chamber having an abrasive rotator therein. As the flaxseed passes over the abrasive rotator, contact with rotator separates the flaxseed components into hulls and kernels Hulls and kernels are separated and may be used in this form or processed farther. Hulls may be further processed by extraction with water and with hexane to remove flaxseed gum and oil, respectively. These two extractions may be done ill any order. The process results in a lignan-rich component of flaxseed, a gum extract and oil. These separate components of flaxseed may be used in products such as foods, personal care products or nutraceuticals.

Abstract: Calender that includes at least one supporting bracket, and a roll stack having at least two rolls. At least one axial end of each of the at least two rolls are supported by the at least one supporting bracket. A connection arrangement includes a fluid connection coupled to at least one of the at least two rolls and a drive connection coupled to at least one of the at least two rolls, and a closed housing is arranged to enclose the connection arrangement. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: An apparatus and methods for the adjustment of the position of a die in a printing press are disclosed. The apparatus and methods provide for the adjustment of a die frame within a chase. The chase defines a horizontal and a vertical axis. The die frame is slidably secured in a chase to permit movement and adjustment of the die frame in the horizontal and the vertical axis. The die frame may be slidably mounted to one or more vertical guides and one or more horizontal guides to facilitate movement and adjustment in the horizontal and vertical axis.

Abstract: A method and apparatus for zone controlling the temperature of a rotating roll. The apparatus includes a roll having a surface at a first temperature and a belt disposed adjacent at least a portion of the surface of the roll. The belt contacts the roll surface in a contact region and has a second temperature that is different from the first temperature of the roll such that the belt affects a temperature change in at least a portion of the surface of the roll in the contact region as the roll is rotated.

Abstract: A vacuum print system comprising: an outer shell to define an airtight inner space and having a closure door at a ceiling thereof; a printer provided in the airtight inner space; a worktable to supply a work to the printer provided in the airtight inner space operable to move; and an air exhaust system connected to the airtight inner space is disclosed.

Abstract: The present invention aims to improve the printing accuracy. Further, the invention aims to reduce the size of the screen compared with the conventional processing pattern, and to reduce the cost of the screen. Further, it is also an object of the invention to lengthen the life of the screen. According to the invention, the screen printer for performing the screen printing using the screen plate includes: the table placed facing the screen plate; and the screen sealing unit which nearly seals the space between the screen plate and the table.