Abstract: A knife sharpener comprises a base, a motor, a grinding wheel assembly, a rotary shaft and a spring. The working channel between the edge of the grinding disc and the grinding awl is automatically adjustable to accommodate different blade of different thickness. When the knife sharpener performs grinding operation, the grinding wheel assembly can simultaneously grind both cutting sides of the knife. In addition, the knife can be clamped firmly through the three contacting points of the grinding disc, the grinding awl, and the cutting edge, so that the operation of knife grinding can be successfully performed.

Abstract: An assembly type cleaning structure for an induction reader comprises a positioning member with an assembling portion and restricting portions. With the assembling portion, the positioning member can be detachably assembled on the induction reader. And the restricting portions enable the positioning member to be forced onto the induction reader. The user can assemble the cleaning structure onto the induction reader or remove it by himself according to the environment.

Abstract: A linear feedback device for an actuator comprises: a coiling belt, a return gear wheel, a driven member, and a sensing feedback device. The sensing linear feedback device serves to feedback the displacement data of the driven member that is moveable along a predetermined rail after engaging with the return gear wheel. The return gear wheel is coaxial with the coiling belt, and the coiling belt unwinds or retracts along with the actuator and drives the return gear wheel to rotate. The gear ratio between the return gear wheel and the driven teeth is used to adjust the back and forth moving distance of the probe. The linear feedback device can be installed in a small external hanging type body and offer an absolute position sensing function while preventing the error accumulation.

Abstract: A plug device for coupling a frame of a pair of glasses to one of a temple or a head strap buckle includes a socket member having a receptacle. The receptacle includes an outer lateral wall having an opening in communication with the receptacle. A button is moveably received in the opening. A resilient member is received in the receptacle and biases the button into the opening. A plug member includes a resilient hook releasably engaged in the receptacle. A distal end of the resilient hook is releasably received in the opening and abuts a peripheral wall of the opening. An outer end of the resilient hook abuts the inner end of the button. The button is pressable in the direction to disengage the distal end of the resilient hook from the opening, allowing the resilient hook to be removed from the receptacle of the socket member.

Abstract: A roller screw having plural circulating devices cooperating with plural helical grooves comprises a screw, a nut, plural rollers and circulating devices. The screw is provided in a surface with at least two helical grooves. The nut is provided with helical grooves opposite to the screw and receiving holes in a peripheral wall thereof, and each receiving hole is provided with a fixing groove at each of two ends thereof. The rollers are arranged in the helical grooves of the screw and the nut. The circulating devices have the same number of the helical grooves of the screw, and each circulating device includes an opening at each of two ends thereof and a passage between the two openings.

Abstract: A paintball gun includes an air valve and a body portion, in which the body portion includes a paintball hole, an axle sleeve and a bolt. By the position change of the air valve, the movement of the bolt is, therefore, controlled between the third and fourth positions, so as to selectively turn the effusion passage open or closed to control the pneumatic air to flow out of the projection passage and projection hole to project the paintball.

Abstract: A paintball gun includes an air valve and a body portion, in which the body portion includes a paintball hole, a communicator, a piston, an axle sleeve and a bolt. By the pneumatic control of the air valve, the piston is pushed between the first and second positions, and the movement of the bolt is, therefore, controlled between the third and fourth positions, so as to selectively turn the effusion passage open or closed to control the pneumatic air to flow out of the projection passage and projection hole to project the paintball.

Abstract: A torque-setting device includes a handle with grooves defined in an internal side, a driving unit attached to the handle, a strain gauge connected to the driving unit, a strain spring abutted against the strain gauge, a nut abutted against the strain spring, an axle and a knob. The axle includes a thread. The thread is engaged with the nut. The knob includes a tooth on an external side. The knob is operable to rotate the axle relative to the nut, thus moving the nut relative to the strain spring to set a value of torque. The knob is movable between a first position where the tooth is inserted in one of the grooves to retain the value of torque and a second position where the tooth is removed from the grooves to allow the rotation of the knob and therefore the rotation of the axle.

Abstract: A rolling element chain system for a linear guideway comprises a slide rail, a slide block, a plurality of rolling elements and a rolling element chain. The circulating path of the slide block is interiorly provided with a guiding groove with a width C, and the rolling elements roll within the circulating path and are confined by the rolling element chain. The rolling element chain has a plurality of spacers for separating the rolling elements from one another and linking portions with a thickness t for linking the rolling elements with one another. The spacer at each end of the rolling element chain has a retaining capacity B for holding the corresponding rolling element. The above structure satisfies the relation: C<t+B/?.

Abstract: A fastener includes a frame, a handle and a reel inserted through the frame and handle so that a strap can be reeled when the reel is rotated. Two bushings are connected to the frame for protecting the reel from the handle or the frame. Two ratchet wheels are connected to the reel. A first detent is movable on the frame for engagement with the ratchet wheels. A second detent is movable on the handle for engagement with the ratchet wheels.

Abstract: A suspension microstructure and its fabrication method, in which the method comprises the steps of: forming at least one insulation layer with inner micro-electro-mechanical structures on an upper surface of a silicon substrate, the micro-electro-mechanical structure includes at least one microstructure and a plurality of metal circuits that are independent from each other, the micro-electro-mechanical structures have an exposed portion on the surface of the insulation layer, and the exposed portion is provided with through holes or stacked metal-via layers correspondingly to the predetermined etching spaces of the micro-electro-mechanical structures, the above predetermined etching spaces and the stacked metal-via layers only penetrate the insulation layer; forming a photoresist with an opening on the upper surface of the exposed portion, and the opening of the photoresist is located outside all the through holes or the stacked metal-via layers; subsequently, conducting etching to realize the suspension of t

Abstract: A transformer includes an iron core having a shaft around which a plurality of coil modules is mounted. Each coil module includes spiral, upper and lower coil sections each having an outer loop and a plurality of inner loops received in and coplanar with the outer loop. The inner loops of the spiral upper coil section and the inner loops of the spiral lower coil section include a common innermost loop through which the shaft extends. Upper and lower ends of each coil module are respectively interconnected to the outer loops of the upper and lower coil sections. The spiral upper section is superimposed on the spiral lower section to form a two-layer structure. The lower end of an upper one of two adjacent coil modules interconnected to the upper end of a lower one of the two adjacent coil modules.

Abstract: A kung fu training device of the present invention includes a positioning portion, a body pole, a shoulder portion, two joint portions, two arm portions and several pins. Polygonal holes and corresponding polygonal poles are disposed on pivoting ends of the shoulder, the first and second joints of the joint portions, and the arm connectors of the arm portions respectively. Thereby, the fist pads disposed on the distal ends of the arm portions are height-adjustable and angle-adjustable about the body pole, and the heights of the shoulder portion and the head portion are also adjustable. As a result, the training device of the present invention is suitable for the trainees with different body sizes to simulate fighting with simulating enemies with different body sizes, so as meet the trainees' need.