Abstract: A system may be used to indicate a need for replacement of a vibrating structure and includes a sensor, an indicator, and a processor. The sensor senses a frequency of vibration of the vibrating structure. The indicator is controlled to provide an indication of the need for replacement of the vibrating structure. The processor compares the frequency of vibration of the vibrating structure to data that relates the vibration frequency of the vibrating structure to fatigue damage of the vibrating structure, and controls the indicator based on the comparison.

Abstract: A system and method for short-range ultrasonic detecting of a target is proposed herein to be used for example in a liquid-dispensing system such as those provided in home refrigerators. The system comprises a sensor assembly including a transmitter and a receiver positioned side by side so as to yield respective transmitting and receiving beams which overlap to define an asymmetrical shaped detection area, a controller coupled to both the transmitter and receiver to activate the transmitter and for receiving echoes indicative of the target from the receiver and to the dispensing system for opening a valve of the dispensing system when a target is detected. The proposed system eliminates the phenomenon of oscillation (decay time of the excitation signal) between the incoming and outgoing sound waves. Noises and false alarm rate minimization methods are implemented, including variable relevance zones and requiring a void of signal before excitation.

Abstract: Devices and methods of creating an image of a biological object are disclosed. In one embodiment of the invention there is a plane wave ultrasonic pulse generator, an ultrasonic wave manipulation device, an ultrasonic detector and an image generator. In a method according to the invention, a biological object is imaged by emitting an unfocussed ultrasonic energy wave front, reflecting at least a portion of the ultrasonic energy wave front from the object, altering a direction of the ultrasonic energy, detecting that energy, and using the detected energy to create an image of the object.

Abstract: A technology for structuring a three-dimensional image in a more accurate position spatially even when an ultrasonic transducer unit does not perform oscillation scanning at completely constant angular velocity is disclosed. According to the technology, an oscillation angle detection means 104 detects an oscillation angle of an ultrasonic transducer unit 1, and a three-dimensional image processing means 11 forms a three-dimensional image based on the oscillation angle detected by the oscillation angle detection means and image data outputted from an ultrasonic receiving means 4.

Abstract: For determining a subjective property such as loudness of a binaural sound signal left and right sound pressures in the left and right ears of a human being, resulting from the binaural sound signal, are determined. The left and right ear and right sound pressures are frequency analyzed to obtain left and right frequency spectra. In each frequency band, the diotic (common) sound pressure in the left and right ears is determined, which would result from a plane wave frontal incidence on the human being, and that would produce the same perceived loudness as the frequency bandwidth limited left and right sound pressures. In each frequency band the inverse frontal headrelated transfer functions are used to determine the free-field sound pressure that would produce the same perceived loudness as the diotic sound pressure. The loudness is determined as the loudness of the totality of frequency bandwidth limited free field sound pressures, preferably using the international standard ISO 532.

Abstract: An electronic sensor is disclosed. The electronic sensor includes a processor, a processor memory coupled to the processor, and at least one input/output block in communication with the processor and with at least one external component monitor. The sensor further includes one or more accelerometers in communication with the processor and coupled directly to at least one component, the one or more accelerometers sensing one or more mechanical vibrations from the at least one component, and the one or more mechanical vibrations oscillating below 1 MHz. The processor compares the one or more mechanical vibrations with a plurality of vibration samples programmed into the processor memory, each vibration sample specific to at least one sensor application.

Abstract: There is provided a method and device for producing an absolute pressure type pressure sensor that enables a relative pressure type pressure sensor to be modified (converted) into an absolute pressure type pressure sensor in a simple and easy manner. The method is characterized by comprising: a step of arranging a relative pressure type pressure sensor, that has a reference pressure chamber therein, and a pressure guide hole whose one end communicates with the reference pressure chamber and the other end opens to the atmosphere, inside a vacuum chamber with the other end of the pressure guide hole opening upward; a step of placing a solder piece onto the other end of the pressure guide hole; a step of drawing a vacuum inside the vacuum chamber; and a step of heating the solder piece until the solder melts.

Abstract: A fuel tank module control system configured to measure fuel level and fuel tank vapor pressure, the system having an aspirator to use air or liquid fuel to vapor, an oscillator cyclically producing pressurized vapor, and a pressure sensor that alternately measures the pressurized vapor provided by the oscillator and the pressure of a fuel column. A check valve is provided downstream of the sensor to restrict the flow of vapor in a single direction. To determine the fuel level, the differential of the square wave output of the sensor is calculated. To determine if there are any leaks in the fuel tank, the tank vapor pressure is measured when the engine is off.

Abstract: A pressure sensor includes a structure that deforms in response to an applied pressure. A light source is directed at the structure. This provides a reflection from the structure. A sensor is arranged to sense the reflection and provide an output related to the applied pressure.

Abstract: A process control system includes a transmitter having transmitter circuitry, a sensor, a remote sensing apparatus, a linkage and a slack take-up device. The sensor senses a process variable of a process fluid. The remote sensing apparatus communicating with the process fluid. The linkage communicates between the transmitter and the process fluid. The slack take-up device selectively adjusts a relative length of the linkage between the transmitter and the remote sensing apparatus.

Abstract: A mounting structure for a pressure sensor serves to facilitate easy attachment of the pressure sensor as well as easy detachment thereof without requiring any large work space. A pair of elastic snap fit portions (8) are formed on a surge tank (4) so as to protrude from a surface thereof, and have engagement protrusions (8a) formed at their one end, respectively, so as to protrude to a side opposite to a case (2). A pair of engaged portions (2b) are formed on the case (2) so as to be engaged with the engagement protrusions (8a), respectively. The snap fit portions (8) are forced to flexibly deform to the pressure sensor (1) when the pressure sensor (1) is attached to and detached from the surge tank (4).

Abstract: A pressure sensor includes a pressure detecting element for detecting a pressure, a circuit board having an electrical circuit to be connected to the pressure detecting element, and a housing having a housing member and a cover. The housing member partitions at least a part of a first space for accommodating the pressure detecting element and at least a part of a second space for accommodating the circuit board such that the first space and the second space are separated from each other. The cover partitions at least a part of a remainder of each of the first space and the second space.

Abstract: An electromagnetic flowmeter includes a measuring tube (1) through which a fluid flows, electrodes (2a, 2b) which detect an electromotive force generated by a magnetic field applied to the fluid and the flow of the fluid, an exciting coil (3) which applies, to the fluid, a magnetic field asymmetrical to a plane (PLN) which includes the electrodes (2a, 2b) and is perpendicular to the axial direction of the measuring tube, a signal conversion unit (5) which extracts a ?A/?t component from the resultant electromotive force of the electromotive force based on the ?A/?t component irrelevant to the flow velocity of the fluid and the electromotive force based on a v×B component originating from the flow velocity of the fluid, which are detected by the electrodes (2a, 2b), and a flow rate output unit (6) which removes a variation factor for a span as a coefficient applied to the magnitude of the flow velocity of the v×B component in the resultant electromotive force, on the basis of the ?A/?t component, and calculate

Abstract: To provide a flowmeter capable of enhancing metering resolution to thus effect accurate metering. When a fluid to be measured is supplied to or discharged from a metering chamber 4, a membrane 11 provided in the metering chamber 4 is reciprocally actuated, and a rotation section R1 performs rotational movement in association with reciprocal movement of the membrane 11. At this time, since the rotation section R1 is provided with a magnet 5 or a direction sensor 6, the magnet 5 or the direction sensor 6 also effects rotational movement. The direction sensor 6 detects rotational movement, to thus determine a relative position between the membrane and the rotation section. Thus, the position of the membrane 11 can be detected, and metering resolution is enhanced. Thus, accurate metering can be performed.

Abstract: An apparatus, system, and method for measuring static pressure in a warm gas flow while minimizing particulate deposit formation includes a housing containing the flow of gas, a pressure sensor, and a heated pressure sampling tube attached to the sensor, with the tube sampling the gas flow. The heated sampling tube reduces the temperature gradient between the gas and the tube, reducing thermophoretic forces that contribute to deposit formation. The sampling tube extends through the housing into the gas flow in one embodiment, enabling the gas to heat the tube and locating the open end of the tube in a higher-flow area of the gas, further reducing deposit formation.

Abstract: A method and apparatus for measuring the flow rate of a fluid within tubing disposed within a downhole wellbore. The present invention provides an inverse Venturi meter inserted within tubing with an enlarged inner diameter portion. Pressure differential is measured between the enlarged inner diameter portion and another portion of the inverse Venturi meter. Flow rate is determined from the pressure differential and the density of the fluid.

Abstract: A method for calculating a property of a fluid includes inducing motion in a conduit such that the conduit oscillates in a first mode of vibration and a second mode of vibration. The first mode of vibration has a corresponding first frequency of vibration and the second mode of vibration has a corresponding second frequency of vibration. The conduit contains a fluid. The first frequency of vibration is determined, and the second frequency of vibration is determined. A property of the fluid based on the first frequency of vibration and the second frequency of vibration is calculated.

Abstract: A spanner with a strain alarm function comprises a spanner body having at least one driving head at one end thereof; a strain gauge installed at the spanner body; a display installed in the spanner body electrically connected to the strain gauge; an alarm unit installed in the display; when a spanner body drives an object to be tightened and a twisting force applied to the object has achieved to a predetermined value, the alarm will emit alert signal to users so as to inform the user that the object to be tightened has achieved to a predetermined position. The alarm unit is one of a light emitting body and a buzzer. The predetermined value is a summation of a desired value for tightening the object and an added value under the consideration of a retuning level of the object as the spanner is released from the object.

Abstract: A magnetic memory cell that includes at least two magnetoresistive memory bits is presented. The memory cell is capable of storing at least two logical states. The first logical state occurs when the bits share the same orientation, such as a parallel orientation or an antiparallel orientation. The second logical state occurs when the bits have opposite orientations. In the second logical state one of the bits has a parallel orientation and the other bit has an antiparallel orientation.

Abstract: The invention relates to a pipette, comprising a tip remover element which, upon moving it against a tip, disengages the tip. The remover element is operated with a mechanism, comprising a rotatable ramp member which is provided with a circle-forming ramp surface, including one or more segments within which the ramp surface has a high point and a low point, whereby the ramp surface, upon rotating through a single segment, forces the remover element first to move against the tip and then allows it to return.

Abstract: Apparatus for withdrawing a liquid sample from a vessel, the apparatus affixed to the vessel and having (a) a plunger forming a sample-receiving space movable from the vessel interior to and beyond a sample-delivery site, and (b) a valve for closing the vessel when the plunger is beyond the sample-delivery site. In the sampling apparatus, the sample-delivery site is incorporated in the valve.

Abstract: A method and device for continuously drawing and mixing liquid samples originating from at least two different containers are described. The device comprises a mixing chamber, which is connected to each of the containers. The device is characterized in that it comprises, between the container and the mixing chamber, at least one intermediate sample chamber for each container, being connected in order to transfer all or a portion of the sampled liquid to the mixing chamber. The device has a vertical configuration.

Abstract: A device for measuring a molecule, wherein a gel substrate material (200) comprises a gel (220) containing a solvent in the network structure thereof and a molecular chain (210), and a cantilever (100) is bound with the molecular chain (210) by a covalent bonding or a physical bonding and pulls up the molecular chain (210) through the above bonding, and wherein the force loaded when the cantilever (100) pull up the molecular chain (210) is measured and the interaction between polymer chains acting between the gel (200) and the molecular chain (210) is detected. The above device can be used for measuring the interaction between molecules, and in particular, can construct an experiment system for measuring the non-covalent bonding interaction between polymer chains at a molecular level.

Abstract: Devices, systems and methods for thermal testing of optoelectronic modules are disclosed. The device includes a frame member, a thermoelectric cooler, a plate in thermal contact with the DUT, a heat sink in thermal contact with the frame, and a metallic clip for attaching the thermal testing device to the module (DUT). The clip secures the thermoelectric cooler to the DUT. The method includes the steps of providing a testing apparatus having a printed circuit board with a test circuit formed thereon. The test board also has an electrical interface disposed in electrical communication with the test circuit, and a thermal testing assembly. A temporary electrical connection is formed between the DUT device and the interface. The thermal testing assembly is used to maintain a test temperature of the DUT device. A data stream is transmitted through the DUT device and then evaluated for adherence to a defined specification.

Abstract: A set of curved components, such as the dovetail region of engine blades, are inspected by mounting each component into a circular carousel in a vertical orientation and rotating the carousel to move each component toward and away from an inspection site. The inspection site clamps a flexible eddy current sensor array to the curved material surface, scans the array over the surface, records the sensor position. A rigid element having a surface geometry similar to the surface shape of the component can be attached to the component to facilitate scanning of the sensor array over a component edge. The response of each sense element in the array may be converted into an effective material property and sense element proximity to the component material surface to verify the quality of the inspection scan and the presence of a defect such as a crack.

Abstract: A variable vibrator mechanism (10) for feeder machines. The vibrator mechanism (10) includes a first member (12) and a second member (14) arranged telescopically with one another. The first member (12) and second member (14) have eccentric weights (axially offset) (16, 26), and are adapted such that the rotational displacement between the eccentric weights (16, 26) is varied by varying the longitudinal displacement between the first and second member (12, 14). Thus allowing the vibrational characteristics of the vibrator to be adjusted by simply varying the displacement between the first and second members (12, 14).

Abstract: A remote controller assembly includes remote controller assembly, comprising a remote controller, and a fixture detachably mounted on the remote controller. Thus, the fixture is fully hidden in the back face of the remote controller, so that the fixture is not exposed from the remote controller, thereby enhancing the aesthetic quality of the remote controller. In addition, the sliding space of the fixture is slidable on the mounting seat of the remote controller, and the guide hooks of the fixture are guided by the guide rails of the mounting seat when the remote controller is axially movable toward the fixture, so that the remote controller is attached to the fixture easily and rapidly, thereby facilitating a user attaching the remote controller to the fixture.

Abstract: An actuation force transmission mechanism is provided that can be interposed between a shift actuator and a shift shaft. The mechanism can include: first and second coupling parts that can be coupled for movement relative to each other in sliding directions; a biasing mechanism that can be configured for urging the first and second coupling parts toward a neutral position; and a stopper mechanism that can be configured for stopping relative movement of one of the first and second coupling parts when moved relatively from the neutral position against an urging force of the biasing mechanism. When the shift actuator is stroked by a predetermined amount, the first coupling part can move relative to the second coupling part against the urging force until the first coupling part is stopped by the stopper mechanism, at which point, the first and second coupling parts can move together.

Abstract: A position detecting device is basically provided with a control section, a detecting section and a setting section. The control section repeatedly controls a gear connecting mechanism in a vehicle transmission to selectively perform a gear connecting operation to obtain a selected gear range and a gear releasing operation to release the selected gear range after the gear connecting operation has been performed. The detecting section detects a position of a connecting member of the gear connecting mechanism after the gear connecting operation has been performed. The setting section sets a shift completion position at which connecting of the selected gear range is determined to be completed based on a plurality of positions of the connecting member of the gear connecting mechanism detected by the detecting section.

Abstract: A device for supplying pressure from an energy storage device to a piston gear shifting actuator by way of a valve device is provided. A pressure regulating and/or control device is used to regulate and/or control the pressure applied to the piston actuator. The pressure regulating and/or control device regulates and/or controls the pressure according to at least one following quantity: temperature, in particular a transmission operating temperature, the load state of the motor vehicle provided with the transmission, and the slope of a surface along which the motor vehicle provided with the transmission runs.

Abstract: An infinitely variable speed gear transmission transmits a torque from an input shaft to an output shaft. A conical member is mounted to the input shaft and it is formed with a helical gear. A rider wheel formed with worm gear toothing meshes with the helical gear on the conical member. The rider wheel is mounted for rotation about an axis substantially orthogonal to said input rotational axis of the input shaft and for translation along said peripheral surface of the conical member. The output shaft is directly or indirectly coupled with a form lock to the rider wheel.

Abstract: In a steering column arrangement having a bracket which is arranged fixedly on the vehicle, a steering column which has a casing tube and a steering spindle which is mounted rotatably therein, the steering column is configured so as to be adjustable in its inclination and length, and clamping device(s) are provided for fixing the steering column. In order to configure the steering column to be safer while maintaining comfort functions, the steering column is connected with the clamping device(s) to the bracket via a bracket slide which is mounted displaceably on the bracket, and locking device(s) being provided between the bracket slide and the bracket.

Abstract: A vehicle footpeg comprising a base that is connectable to a vehicle and a foot support that is connectable to the base. The foot support is preferably attached to the base by removable fasteners permitting the user to easily remove and replace the foot support without having to remove or replace the base. A variety of interchangeable foot supports that have different heights and different surface configurations can be manufactured to accommodate different vehicle rider heights and different applications of the footpeg.

Abstract: The invention aims to provide a torque rod which, by adding an improved rod portion, has not only compression and tensile strength, but also increased bending and twisting stiffness. By the present invention, the twisting stiffness can be raised to 2 to 3 times that of a conventional rib shape. A torque rod, the torque rod structure comprising a rod portion with a built-in pair of rubber bushes, which are formed respectively around a pair of cylinders, the rod portion linking both the rubber bushes, wherein the cross-sectional shape of the central portion of the rod portion forms a rectangular shape and one pair of opposing edges of the rectangular shape form a shape which bulges outwards, and the cross section of the rod portion is one of a hollow portion, honey comb shape, or rib structure. 11, 12 . . . internal cylinders, 20 torque rod, 21 . . . hollow portion.

Abstract: The invention relates to a propulsion power transmission device having a first interface (1) and a second interface (2). According to the invention, a hydrodynamic clutch is mounted in the driving connection between the first interface and the second interface and a first gear train (4) and a second gear train (5) are mounted parallel to each other in the driving connection, in series with the hydrodynamic clutch, the second gear train (5) causing a reversal in the direction of rotation in relation to the first gear train (4) at one of the two interfaces (1, 2). The propulsion power transmission device of the invention is characterized by the following features: the hydrodynamic clutch has two separate working chambers (3.1, 3.2), which can be independently filled with and drained of a working medium in order to transfer torque from one bladed primary wheel (3.3, 3.4) to at least one bladed secondary wheel (3.

Abstract: A direct manufacturing technique involving rapid solidification processing uses a reaction between a metallic molten pool and a reactant gas in an inert atmosphere to form alloys with improved desired properties. By utilizing rapid solidification techniques, solubility levels are increased resulting in alloys with unique mechanical and physical properties. Laser deposition of alloys in atmospheres of varying reactant content produce compositions with intermingled and significantly improved overall properties.

Abstract: Disclosed are a method and an installation for producing steel products (1) having an optimum surface quality, especially extremely low carbon contents (UCL steel or IF steel), nitrogen contents, total oxygen contents, high-strength or stainless steel qualities.

Abstract: The present invention concerns the mining and mineral treatment industry. Specifically, it relates to a solution composition that permits the use of thiourea. Specifically, the patent refers to a process to form a solution that improves, on one hand, the velocity of gold and silver extraction, from minerals and other materials that contain them, improving the stability of the thiourea in the leaching solution and, on the other, the direct electrorecovery of said metals from the aforementioned solution. The invention consists of the leaching solution that, beforehand or simultaneously, has been subjected to a controlled electro-oxidation to produce formamidine disulfide (FADS) which acts as an oxidizing agent for the mineral phases that contain the gold and silver. In the preferred mode, the FADS is present as 10 to 30% of the total thiourea contained in the solution and the electrodeposition of the metals is performed in the same cell (cathodic compartment) in which the FADS is formed (anodic compartment).

Abstract: Process for agglomerating the pulverulent used material and/or the pulverulent fines resulting from the production of organohalosilanes, comprising the mixing of this used material and/or fines with a binder chosen from polysaccharides, in particular starches and dextrins, the addition to this mixture of an amount of water ranging from 3 to 10%, preferably from 4 to 8%, by weight, with respect to the used material+binder combination, the stirring of the solid mixture obtained in the preceding stage, in order to obtain a homogeneous mixture, and the production of a solid agglomerated product by compression in a press. Agglomerated product obtained.

Abstract: Method of cooling an at most partially solidified molten metal during fractional crystallization wherein metal crystals formed have a purer composition than that of the molten metal. Salt in solid form is used to cool the at most partially solidified molten metal.

Abstract: The present invention relates to a direct smelting plant and a direct smelting process for producing molten metal from a metalliferous feed material, such as ores, partly reduced ores, and metal-containing waste streams, the latter of which comprising the steps of (a) pretreating metalliferous feed material in a pretreatment unit and producing pretreated feed material having a temperature of at least 200° C., (b) storing pretreated metalliferous feed material having a temperature of at least 200° C. under pressure in a hot feed material storage means, (c) transferring pretreated metalliferous feed material having a temperature of at least 200° C. under pressure in a hot feed material transfer line to a solids delivery means of a direct smelting vessel, and (d) delivering pretreated metalliferous feed material into the direct smelting vessel and smelting metalliferous feed material to molten metal in the vessel.

Abstract: The present invention relates to a spanner having a toggle bar installed in at least a jaw and allowed to be rotated in one direction for tightening or releasing a bolt (or nut) continually by continuous operation of rotating the spanner's lever in one and converse directions repeatedly in a state of gripping the bolt, also easily operative for tightening or releasing a bolt (or nut), especially, placed in a narrow gap. The spanner is constructed to comprises a lever; a first jaw and a second jaw respectively extending from both sides of the lead end of the lever and forming a gripping space therebetween for gripping a bolt; a toggle bar installed on the lead end of the second jaw to be allowed to be rotated only to outward of the gripping space; a tension adjustment bolt installed in the long hole formed on the bottom of the second jaw and having a lead end connected to the inner side of the toggle bar so as to elastically support the toggle bar to inward of the gripping space.

Abstract: A hand tool includes a head that is adjustable to a plurality of positions. The head is pivotally mounted to a tool body at a pivot axis. A bearing structure is attached at the pivot axis by a hub or fastener, about which the head may be adjusted. An actuator is positioned between the body and the head and acts to lock the head in a predetermined position with respect to the tool body. A plurality of radial slots are provided on a cavity or a bearing structure and receive the actuator in order to lock the tool head in a predetermined position relative to the tool body. The adjustable head allows for the tool to be manipulated to engage fasteners in hard to reach areas and also allow an operator to apply extra torque to the fastener.

Abstract: A hand tool includes a handle having a reception recess defined in an end thereof and a bit is removably inserted into the reception recess. The bit is positioned in the reception recess by a positioning device. A biasing device is located between the bit and an inner end of the reception recess so as to push the bit toward a direction away from the reception recess when replacing another bit.

Abstract: The invention relates to a method and an apparatus for cutting a sleeve to a predetermined length. The sleeve is first moved the direction of the longitudinal axis through a distance corresponding to the required cutting length, a rotating saw blade is driven through the outer surface of the sleeve but not through the inner surface, the sleeve is rotated through a first revolution whereupon the direction of rotation of the sleeve is set to be the same as the direction of rotation of the blade, the blade is driven through the inner surface of the sleeve and the sleeve is rotated until the cut extends around the sleeve.

Abstract: The invention relates to a machining device (D) such as a device associating a machine-tool (100) with a workpiece holding device (200) having an axis about which the workpiece is rotated transversally (A) in relation to the downward axis (Z), the workpiece to be machined (300) being a long workpiece such as a workpiece comprising surfaces to be machined that are concentrated at the two ends thereof. Said machining device is characterised in that the workpiece holding device (200) consists of a frame (210) supporting two guiding bearings (210 and 230) for rotatably guiding the workpiece according to the transversal rotation axis (A), the structure formed by the frame (210) and the two bearings (220 and 230) being closed by the workpiece to be machined (300) by fixing the ends of the workpiece to the bearings (310 and 220). The invention also relates to a method for machining long workpieces.

Abstract: A tool-holding device for an insert tool (14) equipped with an at least essentially disk-shaped hub (42), in particular for a hand-guided angle grinder (32) or a hand-guided circular saw, having a drive device (12) that includes a leaf spring unit (58) and is able to clamp the insert tool (14) in the axial direction (64). The leaf spring unit (58) has at least one freely extending spring piece (110) that extends at least partially in the circumference direction (50, 52).

Abstract: The invention relates to a device for slicing blocks of foodstuffs, comprising a blade (2) wherein the block of foodstuff can be reversibly lifted from a first position into a second position by means of a loading pinion (3) and the loading pinion (3) is curved at least in one position thereof. The invention also relates to a method for slicing at least one block of foodstuff.

Abstract: A power tool and components and accessories therefor are provided. The power tool having at least one of a movable extension member, a retractable handle, a retractable workpiece support, a modular base, a digital display, a display connected to a table, a miter gauge with passing angle setting assembly, a fence with a handle operable to both move the fence and secure it in position, a retractable rail, an electrical outlet, and leg extensions.

Abstract: A blade clamping device comprises a main body which includes two opposited sidewalls and a base plate connected therebetween for defining a cavity for receiving a blade therein. A fixing device mounted between the two sidewalls. A pivot lever is pivotly mounted on the main body about an axis for driving the fixing device to fix or release the blade. A spring is biased between the main body and the pivot lever, which can hold the pivot lever in a predetermined position at which the fixing device clamps the blade tightly. The blade clamping device of the present invention can be kept in the position where the blade is released such that the blade can be easily detached or inserted as required. Furthermore, the operation becomes convenient and easy because of the short moving distance of the operation handle when an operator turns round the pivot lever to fix or release blade.