Powered Serving Jig and Winder Device for Bowstring

Abstract

A powered serving jig and winder device for bowstring comprises a right angle gear train having a drive shaft and a first beveled gear fixed thereon and a hollow transmission shaft with a second beveled gear fixed thereon, the first beveled gear configured to drive the second beveled gear at a right angle. A gear train collar comprises a first drive shaft bearing and left and right transmission shaft bearings. A first and a second serving cam are fixed to the transmission shaft at either end and have at least two openings for attaching a serving jig therein. A modified serving jig comprises a bowstring groove and a serving cord guide recessed therein and at least two pins extending away from the jig in a parallel direction to the bowstring groove, the pins configured to allow the serving jig to attach to one of the first and second serving adapters.

1 . A powered serving jig and winder device for serving a bowstring, comprising:
 a right angle gear train having a drive shaft orthogonal to a hollow transmission shaft, the drive shaft configured to be received into a chuck of a portable drill; and   a left and a right serving cam, each cam configured to attach to a respective end of the transmission shaft and to define a hole coaxial with the transmission shaft, each cam also configured to interlock with a serving jig.   
     
     
         2 . The powered serving jig and winder device of  claim 1 , further comprising a bushing disposed in the coaxial hole of each serving cam, the bushing configured to protect the bowstring and serving cord from a rotation of the cam around the bowstring and the serving cord. 
     
     
         3 . The powered serving jig and winder device of  claim 2 , wherein the bushings comprise one of delrin, nylon and like materials and composites thereof. 
     
     
         4 . The powered serving jig and winder device of  claim 1 , wherein a coaxial hole in a serving cam is nominally at least one of three times as large as a bow cam portion of served bowstring and 1.30 times as large as an endloop portion of served bowstring to limit vibrations of the bowstring being serviced and therefore reduce service gaps of the serving cord around the bowstring with respect to service through a larger coaxial shaft. 
     
     
         5 . The powered serving jig and winder device of  claim 1 , wherein the right angle gear train further comprises a first beveled gear fixed on the driveshaft and a second beveled gear fixed on the transmission shaft, the first beveled gear configured to drive the second beveled gear at a right angle. 
     
     
         6 . The powered serving jig and winder device of  claim 1 , further comprising a gear train collar configured to fix the drive shaft at a right angle to the transmission shaft, the collar comprising a first drive shaft bearing and a left and a right transmission shaft bearing, the bearings configured to reduce frictional forces between the drive shaft, the transmission shaft and the gear train collar. 
     
     
         7 . The powered serving jig and winder device of  claim 6 , wherein the gear train collar comprises a recessed geometry configured to receive an indicia sticker therein. 
     
     
         8 . The powered serving jig and winder device of  claim 1 , further comprising a gear train collar enclosure configured to enclose the gear train, the collar, the drive shaft, the transmission shaft and the transmission shaft bearings. 
     
     
         9 . The powered serving jig and winder device of  claim 1 , wherein the gear train collar enclosure defines at least one hole configured to allow the application of a lubricant to the gears therein. 
     
     
         10 . The powered serving jig and winder device of  claim 1 , wherein each cam configured to interlock with a serving jig further comprises at least one of a pin extending therefrom and a hole defined therein, each pin thereof configured complementary to a hole defined in the serving jig and a hole thereof configured complementary to a pin in the serving jig. 
     
     
         11 . The powered serving jig and winder device of  claim 10 , wherein a shape of a serving cam comprises a rounded end rectilinear shape, a disk, an oval, an ellipse and any other cam-like geometry comprising at least one of an interlocking pin and hole. 
     
     
         12 . The powered serving jig and winder device of  claim 1 , wherein an outside edge of one serving cam to an outside edge of another cam measures approximately 92.0 millimeters and an outside edge of one cam with a bushing to an outside edge of another cam with a bushing measures approximately 93.5 millimeters. 
     
     
         13 . The powered serving jig and winder device of  claim 1 , wherein each serving cam is comprised of a solid block of machined aluminum approximately 13.5 millimeters thick. 
     
     
         14 . The powered serving jig and winder device of  claim 1 , wherein each beveled gear and each serving cam are attached to the transmission shaft via a set screw and the drive shaft bearing is attached to the drive shaft via a set screw. 
     
     
         15 . The powered serving jig and winder device of  claim 1 , further comprising a serving jig comprising at least one of a pin extending therefrom and a hole defined therein, each pin configured complementary to a hole defined in a serving cam and a hole configured complementary to a pin in a serving cam and thereby interlock the serving jig on a serving cam to align a bowstring groove on the jig with the hollow transmission shaft. 
     
     
         16 . The powered serving jig and winder device of  claim 15 , wherein the at least one of a pin extending therefrom further comprises two serving jig pins extending from a mounting block attached to the serving jig, wherein the two pins measure approximately 41.0 millimeters from center to center. 
     
     
         17 . The powered serving jig and winder device of  claim 15 , wherein the two serving jig pins each extend approximately 18 millimeters from a side of the serving jig and a free end of each pin is chamfered to facilitate interlocking with a parallel hole a serving cam. 
     
     
         18 . The powered serving jig and winder device of  claim 15 , further comprising a mounting block affixed on an inside surface of the serving jig, the block comprising at least one of a pin extending therefrom and a hole defined therein, the block also comprising a notch for clearance from the bowstring groove. 
     
     
         19 . A powered serving jig and winder device for serving a bowstring, comprising:
 a left and a right serving cam, each cam configured to attach to a respective end of a powered transmission shaft and to define a hole coaxial with the transmission shaft, each cam also configured to fit with a serving jig; and   a bushing disposed in the coaxial hole of each serving cam, the bushing configured to protect the bowstring and serving cord from a rotation of the cam around the bowstring and the serving cord.   
     
     
         20 . A serving jig, comprising:
 a serving cord train including a supply bobbin, two tensioning rods and a serving cord guide recessed in a bowstring groove formed in a body of the jig, the train configured to supply serving cord from the bobbin between the tensioning rods and through the serving cord guide into the bowstring groove for serving cord around a bowstring; and   at least one of a pin extending from the jig and a hole defined therein, each pin and hole configured complementary to a hole and pin respectively defined in and extending from a serving cam of a powered winder device and thereby interlock the serving jig to the serving cam and align the bowstring groove on the jig coaxially with a hollow transmission shaft of the winder.