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Racket stringing apparatus and method

Image Number 4 for United States Patent #4326713.

A racket stringing machine having a racket head holding fixture and a carriage mounted for reciprocation toward and away from the fixture and a string clamp mounted on the carriage for engaging a string drawn through a racket head mounted on the fixture for tensioning the string upon movement of the carriage away from the fixture; a first brake which is automatically set upon drawing of the string to an elevated tension greater than the desired final predetermined tension to effect a pre-stretching of the string to a length beyond its length at such predetermined tension while permitting a decrease in the string tension; and a second brake which is automatically set to lock the string at the desired final predetermined tension. The apparatus also includes means for providing a controlled restrained rate of increase in string tension and a controlled restrained rate of decreasing string tension at tensions between the predetermined tension and maximum tension. Means is also provided for adjusting the amount of pre-stretching of the string.

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