High speed two travels thread rolling machine

A planetary rolling machine for forming screw threads on work piece blanks comprising in combination:

• a substantially disc-shaped central rotary die having a thread forming surface on a side face thereof,
• at least one stationary segment die having a thread forming surface spaced from but proximate to said rotary die so as to allow passage of blanks between said side face of said rotary die and said thread forming surface on said stationary die,
• a feeder holder proximate to an inlet area between said stationary die and said rotary die and a discharge area proximate to a terminal portion of said stationary die remote from said inlet area,
• means for actuating said feeding holder,
• cam means fixedly mounted on said rotary die for rotation therewith,
• normally inoperative switch means for controlling said feeding holder actuating means,
• said switch means including a microswitch for periodic engagement by portions of said cam means during the rotation of said rotary die at each of plural starting points for actuation of said feeding holder,
• said cam means being arranged to operatively condition said switch means periodically during the rotation of said rotary die corresponding to the starting points of a threading operation on said blanks for actuation of said feeding holder to feed a blank, into said inlet area,
• and time adjusting means for altering the control between said switch and said feeding holder actuating means while the machine is running.