Abstract: A pulling string apparatus of a stringing machine comprising a string gripper, a sensor, a drive element, a transmission mechanism and a control circuit; the sensor is connected with the string gripper to detect the pull force of the string gripper; the control circuit compares the detected pull force value with a pre-set value, and control the rotation of the drive element; the transmission mechanism comprises a mounting base, a sliding block, a transmission rack and a drive gear; wherein the drive gear is connected to the drive element and is engaged with the transmission rack, the sliding block arranged on the transmission rack is connected with the sensor; when the sensor and the string gripper are driven forward or backward by the sliding block under the act of the transmission rack engaged with the drive gear, the racket string will be tensioned or loosened.

Abstract: A first improvement to racket stringing machines, for the sport racquets in badminton, tennis, racquetball, and squash/etc. sports, includes a tensioning of two opposite strings with one string tensioning mechanism. A movable base for the racket mounting mechanism is used to link the two ends of tensioning mechanism together and achieve the object to string two strings with one action of string tensioning mechanism. A second improvement is specific for the drop weight tensioning method and includes a moving of the support frame of the drop weight, instead of the rotating the drop weight. A third improvement includes a cross-stringing aid for weaving the cross string during the stringing process. Each of these improvements, either alone or together, are believed to speed up the stringing process so that it is much faster than convention stringing equipment.

Abstract: A racquet stringing machine includes a base, a clamp device for clamping a racquet frame, and a string pulling device. The clamp device has a turntable and a clamping portion. The turntable includes a rotating shaft pivotally connected to the base. The clamping portion is fixed on the turntable. The string pulling device is disposed at one side of the clamp device for tightening a string passing through the racquet frame and rotating the turntable according to a threading position. The base is provided with a sensing unit electrically connected to the string pulling device for sensing the present threading position of the string and for generating a control signal to control the string pulling device to pull the string.

Abstract: Embodiments disclosed herein relate to systems and methods for stringing a racket. In an embodiment, a system for stringing a racket includes a support structure, a mounting device, actuators, links, and a controller. Each actuator includes a selectively movable arm movable between a retracted position and an extended position. Each link is coupled to a different arm and configured to couple to a string on the racket. The controller is configured to coordinate movement of each arm between the retracted position and the extended position in a predetermined sequence. Movement of each arm in the predetermined sequence is effective to tighten the racket string on the head of racket when the racket string is woven across a head of the racket such and each link is coupled to a different portion of the racket string between two adjacent grommet holes on the head of the racket.

Abstract: This system (1) for blocking one or more strings (C) of a racket on the stringing machine comprises a guide support on which two clip holders (3) each provided with a clip (37) for gripping a string (C) are mounted. Each of the clip holders (3) is movable relative to the support along a trajectory forming a closed contour around a central axis (X5) of the support.

Abstract: A device is provided for stringing a racket having a racket frame with holes in the racket frame. The device includes a frame and a cradle rotationally coupled to the frame and configured to mechanically secure the racket via the racket frame. The device also includes multiple elements coupled to at least one of the frame and cradle, including a grasping element configured to engage a string and modify the position and/or tension of the string, a clamp configured to engage the string and maintain the position and tension of the string, an imagining device, and a processor, the processor capable of receiving information from the imaging device indicative of a racket position, hole position, and/or string position, and providing instructions for operating the grasping element, clamp, and/or cradle.

Abstract: A dual tension racket string tensioning system and methods for implementing the same are disclosed. Embodiments of the disclosure include a tensioner equipped with two or more receptacles to releasably grip two or more portions of string simultaneously, and simultaneously apply a force at each portion of the string held in the receptacles. Embodiments of the present disclosure include a turntable rotatably coupled to a base structure, a mounting support adjustably coupled to the turntable (the mounting support configured to receive and hold a racket), and a dual tensioner, as disclosed herein, coupled with the base and operable to apply force (1) at a first portion of the string via the first receptacle; and (2) at a second portion of the string via the second receptacle. Some embodiments further include a stationary dual-string clamp. Further embodiments include a gear dial for fine tuning the force applied to the string portions.

Abstract: This system (S) for tensioning a racket string (C) comprises a traction module (1) suitable for exerting a traction force (T) on a string (C) of a racket, including a grip (3) comprising two opposite jaws (32) suitable for gripping the string (C) between them when it is tensioned, and a traction head (5) on which the grip (3) is mounted, the jaws (32) being translatable simultaneously relative to the traction head (5) and arranged such that the translation of the jaws (32) causes them to tighten around the string (C), a rail (7) on which the traction head (5) of the traction module (1) is mounted translatably, and a traction motor able to translate the traction head (5) of the traction module (1) on the rail (7), via a driving system (13).

Abstract: An attachment assembly for attaching a generator to a motor vehicle engine is provided. The assembly may include at least one engine attachment boss secured to the engine. The attachment assembly may further include a plurality of generator housing legs integrally formed with a generator housing. The assembly may further include a support dowel fitted, at a first end, within the bore located on the inner opposing side of one of the plurality of generator housing legs. The support dowel may be inserted, at a second end, into the bore of the at least one engine attachment boss, in order to couple the generator to the engine during assembly. This combination allows placement and fixation of the generator to the engine by a single operator without the need for an assembly assist device. A method for securing a generator to a motor vehicle engine is also provided.

Abstract: A high-frequency bandwidth amplifier circuit comprises: a push-pull amplifier, a feedback resistor, a first active inductor, and a second active inductor. An input terminal of the push-pull amplifier is connected with an external input terminal. An output terminal of the push-pull amplifier is connected with an output port. A first end of the feedback resistor is connected with the external input terminal. A second end of the feedback resistor is connected with the output port. A first end of the first active inductor is connected with an external power source. A second end of the first active inductor is connected with the output port. A first end of the second active inductor is grounded. A second end of the second active inductor is connected with the output port.

Abstract: The invention is a machine for stringing rackets. The invention comprises a stringing machine utilizing a sliding spring within the pulling mechanism to allow for customized tension application. A user changes the tension in the stringing machine system by moving the slidable spring along the length of a tension transfer bar. The invention may optionally provide for a means for automatically locking the rotation of the mounting plate during the stringing process. The invention may optionally provide for a self-locking string clamp to be used on the machine for stringing rackets.

Abstract: The invention is directed toward a machine and method for stringing two strings on a tennis racket substantially simultaneously. The machine is a racket stringing machine comprised of a mounting plate, a first string gripper and a second string gripper, a first string clamp and a second string clamp. The machine may be further comprised of an electromotor and means for control, a first string gripper arm and a second string gripper arm, a string clamp base, a machine base, and a pedestal. The method comprises the steps of threading a length of string with a first end and a second end through the grommets on a racket, threading the first end of the string through a first string gripper and the second end through a second string gripper, securing the ends of the length of string, and applying a desired tension on the length of string.

Abstract: The invention is a machine for stringing rackets. The invention comprises a stringing machine utilizing a sliding spring within the pulling mechanism to allow for customized tension application. A user changes the tension in the stringing machine system by moving the slidable spring along the length of a tension transfer bar. The invention may optionally provide for a means for automatically locking the rotation of the mounting plate during the stringing process. The invention may optionally provide for a self-locking string clamp to be used on the machine for stringing rackets.

Abstract: A clamping assembly for stringing machine includes a slide member, a positioning device, a control device and a rail. The positioning device and a tube are located on two ends of the slide member. The control device includes a pin, a ring-shaped member and a knob. The pin is pivotably connected with the knob. The tube includes an engaging section and a receiving section. The receiving section has a positioning pin and a spring which biases the positioning pin so as to move the positioning pin axially. The knob having a pin hole defined in an underside thereof and can be securely positioned by inserting the insertion member into the pin hole. The knob includes a release button which is connected with a bolt. When pressing the release button, the bolt moves the insertion member which releases the knob.

Abstract: A customized racquet stringing system for a racquet having a plurality of main and cross string segments. The stringing system includes a stringing machine having a base and a stringing platform, and a control unit. The stringing platform is coupled to the base. The stringing platform includes a turntable and a string tensioning assembly. The string tensioning assembly is configured to receive one or more string tension control signals. The control unit is operably coupled to the string tensioning assembly and is configured to execute a string tensioning program and to provide a plurality of the string tension control signals based off of the string tensioning program to the tensioning assembly. The control unit includes a processor and a memory. The tension control signals correspond to at least three separate string tension values applied to the plurality of main string segments and/or the plurality of cross string segments.

Abstract: An ergonomically-designed racquet stringing machine. The stringing machine includes an electronic control unit coupled to a platform and/or to a height adjustment assembly. The control unit is capable of generating a control signal to automatically adjust at least one parameter of the machine, such as machine height, angle of stringing platform, or string tension, based upon a selected user profile. A method of controlling tension in a racquet while stringing the racquet entails the use of the stringing machine.

Abstract: A height adjusting device for use in string puller of string pulling block of string machine comprises the string machine including a rod member for connecting with a string pulling block allowing to move relative to the rod member and at least having a string puller and a lever disposed thereon, wherein the height adjusting device includes the string pulling block having an upper support provided therein and having a titled slidable mount disposed thereon, includes a lower support mounted on the rod member, having a titled coupling seat affixed thereon and connecting with the string puller, the coupling seat is obliquely coupled with the lower support and involves an inclined rail arranged thereon for axially moving a sliding member therein, by attaching the slidable seat onto the sliding member for pivotally connecting with the rail, the upper support may obliquely move upward and downward along the rail, thus adjusting the height of the string puller.

Abstract: A clamping device for stringing machine includes a slide member, a positioning device, a control device and a rail. The positioning device and a tube are located on two ends of the slide member. An extension of a clamping device is inserted into the tube. The control device includes a pin, a ring-shaped member and a knob. The pin is pivotably connected with the knob. A torsion spring is received in an annular space of the knob so as to rotate the knob to its original position. The tube includes an engaging section and a receiving section. The receiving section has a positioning pin and a spring which biases the positioning pin so as to move the positioning pin axially. The knob having a pin hole defined in an underside thereof and can be securely positioned by inserting the insertion member into the pin hole.

Abstract: A device for easily and efficiently replacing the gut (1) of a racket, comprising a mechanism (11, 12) for clamping a frame (F) at least at one position and a tension head (H) for holding a part of the gut (G) loosely pre-tensed through a gut hole (71) and applying a tension thereto, wherein the clamp mechanism (11, 12) is installed on one side of a frame base (T) for mounting the racket thereon, the tension head (H) is disposed on the outer peripheral side of the frame (F) so as to be positioned close to and apart from the outer edge of the frame (F) and, when the tension is applied to the gut (G), the tension head (H) comes into contact with the outer edge of the annular frame (F) and holds the other side of the annular frame (F) by the tension applied thereto, and the clamp mechanism (11, 12) is formed so as to be rotatable generally around the center of the frame (F), and the tension head (H) is disposed slidably in the radial direction of the frame along a slide rail (R).

Abstract: A racket stringer includes a work table, and two opposite fixing devices each mounted on the work table and each including a rack, a guide plate, two foot posts, a support shaft, and a press rod. Thus, the fixing device has a quick positioning microadjustment function. In addition, the fixing device can be displaced easily and rapidly, thereby facilitating the user operating the racket sag stringer.

Abstract: Disclosed is a tennis racket stringing machine. The machine comprises racket fastening means including a lower supporting plate on which a head frame of a tennis racket is seated to be securely maintained in a lengthwise direction of the lower supporting plate, a fixed section which is projectedly disposed adjacent to one end of the lower supporting plate and functions to fasten one end of the head frame, a movable section which is disposed adjacent to the other end of the lower supporting plate to be capable of being moved along the lengthwise direction and functions to fasten the other end of the head frame, and a clamp which is located below the lower supporting plate to rotatably support the lower supporting plate; and tensioning force adjusting means separately located from the racket fastening means, for adjusting tensioning force of string installed through the head frame.

Abstract: A string drawing electrical device for a racquet has a casing, a string holder, an actuating device and a control unit. The string holder is rotatably attached to a panel of the casing. The actuating device is mounted in the casing and provides two functions, feeding and reversing, to the string holder. The control unit is mounted in the casing for controlling the actuating device to act. Accordingly, the string drawing electrical device can tighten and loosen the string, and the tensile force of the string of the racquet can be accurately controlled.

Abstract: A racquet stringing machine which accomplishes tensioning of the strings of a racquet by the use of one or more combination tensioning and holding clamp units which operate directly on the string inside the racquet. The present invention also provides fixed, non-rotating racquet head frame holding fixture holds the racquet stationary throughout the stringing process. The racquet is supported against distortion by compressive mounts disposed along the outer perimeter of the racquet head frame only. The racquet stringing machine further includes an offset pedestal which stabilizes the machine by counterweight effect while keeping the floor beneath the racquet holding fixture free of obstruction.

Abstract: A racket string bracing apparatus including a base having a column sleeve at one end and a U-shaped upright support at an opposite end, a work table turned about the column sleeve, internal racket frame holders and external racket frame holders respectively mounted on the work table to hold down the racket frame to be strung, a string bracing mechanism mounted on the upright support and controlled to brace the string, wherein a pawl and a gear are mounted in the string bracing mechanism to prohibit it from reverse rotation; each of the external racket frame holders includes a slide slidably mounted on the work table and fixed in place by a tightening up screw, a transverse sleeve welded to the slide, two horizontal extension bars respectively and longitudinally slidably inserted into two opposite ends of the transverse sleeve and fixed in place by a respective tightening up screw, and two stop rods respectively perpendicularly fastened to the horizontal extension bars at respective locations remote from the t