Perfect layer coil winding apparatus

A perfect layer coil winding apparatus for forming a multi-layered perfect layer coil which includes wire winding means for rotating a bobbing having flanges on both ends thereof to perform a winding operation and provided with a detector for detecting a degree of rotation of said bobbin, and feed means provided with a pair of rollers for holding therebetween a wire to supply said wire to said bobbin and difine a supply position of said wire, for moving said supply position forward and backward in a direction parallel to the axis of said bobbin in synchronism with the rotation of said bobbin in such a manner that said supply position follows a winding position for winding said wire round said bobbin thereat with the delay of a predetermined amount on the basis of the output of said detector, further comprising:

• said wire winding means including a shaft and a tail stock shaft to hold therebetween a bobbin of a variable width, said tail stock shaft being slidable in the axial direction thereof to adjust the width of said bobbin;
• push means for the initial stage of said winding operation equipped with a push plate, said push plate being capable of getting near or away said bobbin in a plane parallel to and spaced apart by the diameter of said wire from one of said flanges, said winding operation being first performed on the side of said one flange, said bobbin having said flanges being held by said wire winding means, said push plate being brought near said bobbin at the beginning of said winding operation to push an initial portion of said wire against said one flange and wind said wire along said one flange;
• position detecting means for detecting the position of each of said flanges of said bobbin held by said wire winding means;
• diameter measuring means for measuring the diameter of said wire wound round said bobbin;
• and
• control means connected to said position detecting means and said diameter measuring means for calculating the width of said bobbin from the position of said each flange detected by said position detecting means and for calculating the number of turns per layer in a perfect layer coil winding and the winding width of said bobbin required to conduct said perfect layer coil winding from said calculated width of said bobbin and the diameter of said wire measured by said diameter measuring means to slide said tail stock shaft toward said shaft and adjust said width of said bobbin to said winding width, said control means bringing said push plate of said push means near said bobbin to push said initial portion of said wire against said one flange, said control means keeping said push plate away from said bobbin and starting the movement of said feed means when the degree of rotation of said bobbin reaches a predetermined angle after the start of said winding operation.

In a perfect layer coil winding apparatus comprising

• (a) holding means for holding a bobbin in a manner as being rotatable on the axis thereof, said bobbin being provided with flanges on both ends thereof, a wire being wound round said bobbin between said flanges, and
• (b) feed means including a pair of rollers for holding at a nip therebetween a portion of said wire to be wound onto said bobbin and for defining the supply position of said wire to said bobbin, and roller moving means for moving said pair of rollers in a direction parallel to the axis of said bobbin and in a manner so that said nip always points to a circumference portion of said bobbin, said motion of said rollers being effected in such a manner that the position of said rollers follows a position on said bobbin at which said wire sent from said rollers is wound round said bobbin, with the delay of a length less than the diameter of said wire,
• the improvement which comprises
• (A) a holding mechanism included in said holding means for holding said bobbin in a manner as being rotatable on the axis thereof which the width between said flanges of said bobbin compressed to a length, the intermediate portion of said bobbin sandwiched by said flanges for winding said wire thereon having a variable width and being reduced in width by compressing said bobbin between said flanges, said length being defined by an external control signal;
• and
• (B) control means including first, second and third means, said first means detecting the width between said flanges of said bobbin before and after the compression of said bobbin, said bobbin being variable in width and held by said holding mechanism, said second means detecting the diameter of said wire wound round said bobbin, said third means receiving outputs from said first and second means to calculate a required width of said intermediate portion corresponding to a possible number of turns per layer from the width between said flanges prior to said compression given by said first means and the output of said second means, said required width of said intermediate portion being supplied to said holding mechanism as said external control signal, thereby allowing said holding mechanism to hold said bobbin while maintaining the width of said intermediate portion at a predetermined value.