Racket stringing device

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, on a casing 1, lamps 2-6 are provided.
The lamp 2 indicates that a main switch 7 is on.
The lamp 3 indicates that the device is in operation.
The lamp 4 indicates that a motor has been stopped by a limit switch.
The lamp 5 indicates that no tension is applied to the string or the tension to the string has not reached a preset pound value.
The lamp 6 indicates that the device is ready for resetting.
A foot pedal switch 9 is connected to a terminal 8.
Reference numeral 10 designates a power cord, 11 designates a fuse, and reference 12 designates a base.
(FIG.
2) A guide frame 13 is secured to the base 12 to guide slide plates 23 in a horizontal direction.
A reversible motor 14 is secured to the base 12.
A threaded screw 15 is fixedly coupled to a rotary shaft 14a of the reversible motor 14.
A nut 16 threadedly engages on the threaded screw 15.
(FIG.
4) A scale 17 graduated in pounds is secured to the slide plates 23 and has an upside down U- shaped section.
The scale 17 has a threaded screw 19 with a knob 18 at one end thereof.
The screw is turnably mounted between a pair of walls.
A nut 20 threadedly engages the threaded screw 19 and carries a limit switch 21.
A pointer 22 is on the nut 20.
The slide plates 23 are supported by the guide frame 13 and guided thereby so as to slide along the guide frame in a horizontal direction.
The slide plates 23 are formed with slits 24, 25 (FIG.
4) extending in the direction in which the slide plates 23 slide.
A string clamp 26 is secured to the top of the slide plates 23 to securely hold one end of the string to be strung.
A coil spring 27 has one end secured to the slide plates 23 and the other end secured to one end of levers 28 (FIG.
4).
The levers have their bottom end pivoted on the slide plates through pins 29.
The levers 28 are formed with slits 30 and 31 to receive coupling pins 32 and 33, respectively.
The pin 32 is provided on the nut 16 to couple the nut with levers 28