Tangential thread rolling head

Abstract

The invention relates to a tangential thread rolling head including two rolling head arms having a thread roll rotatably mounted on an axle. The thread rolls are configured to engage with a gear and be pushed laterally into an assembled position into the rolling head arms before the installation of the axles and the axles can be pushed into a bearing bore hole of the thread rolls. The two thread rolls have identical thread profiles that are offset with respect to each other when the thread rolls are in the assembled position.

1 . A tangential thread rolling head comprising:
 two thread roll arms;   two thread rolls having identical circumferentially disposed thread profiles, each thread roll defining a bearing bore hole and configured to be rotatably mounted on an axle, wherein each thread roll engages a gear coupling the thread roll and can be pushed laterally into an assembled position into the rolling head arms before installation of the axle, and wherein one of the axles can be pushed into the bearing bore hole of a thread roll; and   a roll engagement means configured to engage a gear engagement means of the gear, the roll engagement means and the gear engagement means configured to only allow the two thread rolls to be installed in a single defined rotary position, wherein the single defined rotary position of the two thread rolls offsets the identical circumferentially disposed thread profiles with respect to each other.   
     
     
         2 . The tangential thread rolling head according to  claim 1 , wherein the roll engagement means are formed by catches of the thread rolls and the gear engagement means are formed by catches of pinions of the gear. 
     
     
         3 . The tangential thread rolling head according to  claim 2 , wherein the catches of the thread rolls and the catches of the pinions are complementary to each other. 
     
     
         4 . The tangential thread rolling head according to  claim 2 , wherein the thread rolls and the pinions are disposed on a common axle. 
     
     
         5 . The tangential thread rolling head according to  claim 2 , wherein the catches of the thread rolls each form at least one stop surface, wherein the at least one stop surface abuts the catches of the pinions in the assembled position. 
     
     
         6 . The tangential thread rolling head according to  claim 5 , wherein the at least one stop surface is formed by a stop section connecting two opposite-lying catch sections of the thread rolls. 
     
     
         7 . The tangential thread rolling head according to  claim 6 , wherein each stop section has a smaller thickness than the opposite-lying catch sections so that a seat delimited by the stop surface is formed between the opposite-lying catch sections and configured to engage a complementarily catch of a corresponding pinion. 
     
     
         8 . The tangential thread rolling head according to  claim 7 , wherein the pinions and corresponding gear wheels of an engaging gear include optical markings configured show a proper installation position of the pinions relative to the gear wheels engaging them. 
     
     
         9 . The tangential thread rolling head according to  claim 1 , wherein the two rolling head arms are not movable relative to each other.