A robotic manipulator is used to control the forces and angles applied on the strings during stringing of a lacrosse head. Precise string lengths may be implemented for certain features of the pocket. In some embodiments, the manipulator attaches the pocket to a lacrosse head and produces a strung head which has precise ratios of tension when comparing various strings within the pocket. One or more robot arms with end effectors such as grippers may be used. The forces used when tying each knot can be consistent throughout the pocket, or vary according to which particular knot is being tied. The tension of shooting strings and/or runners may be finely tuned in some embodiments.

A set of racket cross-string guides which are pre-woven over a string guide holder in the same pattern used for inserting the racket cross-strings.

A set of racket cross-string guides which are pre-woven over a string guide holder in the same pattern used for inserting the racket cross-strings.

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.

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.

A string clamping device of a threading machine for a racket contains: a clamp unit, a tightening unit, an adjustment disc, a connection column, and a fixing structure. The clamp unit includes a body, a locking seat, and two first springs. The body has multiple first paws, the locking seat has multiple second paws, and among the multiple first and second paws is defined a gap of the clamp unit. The tightening unit includes an abutting block and an operation handle, the body has a first protrusion with a first through orifice, and the adjustment disc includes multiple teeth, wherein between any two adjacent teeth is defined a recess. The fixing structure includes an affix member, a coupling shaft, a second spring, a screwing element, and a support part, wherein the affix member has a retaining portion, and the second spring contacts with a drive tab of the support part.

A string clamping device of a threading machine for a racket contains: a clamp unit, a tightening unit, an adjustment disc, a connection column, and a fixing structure. The clamp unit includes a body, a locking seat, and two first springs. The body has multiple first paws, the locking seat has multiple second paws, and among the multiple first and second paws is defined a gap of the clamp unit. The tightening unit includes an abutting block and an operation handle, the body has a first protrusion with a first through orifice, and the adjustment disc includes multiple teeth, wherein between any two adjacent teeth is defined a recess. The fixing structure includes an affix member, a coupling shaft, a second spring, a screwing element, and a support part, wherein the affix member has a retaining portion, and the second spring contacts with a drive tab of the support part.

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.

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.

An automatically braking tensioner for a racket stringing machine is disclosed. The tensioner comprises a tensioner housing, a drum connected to the tensioner housing, a string gripper connected to the drum, a disk brake having an axle extending from an axis of the disc brake, a lever disposed in the tensioner housing, and a brake lever disposed in the tensioner housing. The disk brake is connected to a stringing machine body and is rotably stationary relative to the stringing machine body. As the tensioner is rotated about the disk brake, the brake lever is engaged with the disk brake when the tensioning force is equal to a desired force which can be established my means of a compression spring. In some embodiments the tension can be altered by varying the tension or position of the spring.