Thread-rolling machine with rotatable rolling plates

Abstract

A thread-rolling machine includes a vertical rotating shaft journalled on a machine base, and a thread-rolling unit. The thread-rolling unit includes a plurality of angularly equidistant rotatable rolling plates fixed on the rotating shaft, and a plurality of angularly equidistant fixed rolling plates fixed on the machine base and disposed around the rotatable rolling plates. During rotation of the rotating shaft, nail-shaped blanks are fed simultaneously onto the thread-rolling unit. Each of the blanks is rolled between a respective one of the rotatable rolling plates and a respective one of the fixed rolling plates, thereby forming a bolt.

I claim:  
     
         1 . A rotating type thread-rolling machine comprising: 
 a machine base;    a vertical rotating shaft journalled on said machine base;    a thread-rolling unit including 
 a plurality of angularly equidistant rotatable rolling plates disposed fixedly on said rotating shaft, each of said rotatable rolling plates being formed with a cutting surface that has a rolling-starting side and a rolling-ending side, and  
 a plurality of angularly equidistant fixed rolling plates disposed fixedly on said machine base and disposed around said rotatable rolling plates, each of said fixed rolling plates being formed with a cutting surface that has a rolling-starting side and a rolling-ending side; and  
   a plurality of angularly equidistant feeding units disposed on said machine base, each of said feeding units being adapted to feed a row of headed nail-shaped blanks toward a standby position during rotation of said rotating shaft relative to said machine base, each of the standby positions of the blanks being adjacent to said rolling-starting sides of said cutting surfaces of a respective one of said rotatable rolling plates and a respective one of said fixed rolling plates such that the blanks fed from a respective one of said feeding units can reach a respective one of the standby positions one by one at a time interval so as to permit movement of each of the blanks onto said rotatable rolling plates and subsequent rolling of the blanks between said rotatable rolling plates and said fixed rolling plates, thereby forming simultaneously a plurality of bolts during each thread rolling operation of said thread-rolling unit.    
     
     
         2 . The thread-rolling machine as claimed in  claim 1 , further comprising: 
 a plurality of stop plates fixed respectively to said fixed rolling plates and disposed respectively adjacent to said rolling-ending sides of said cutting surfaces of said fixed rolling plates so as to be adapted to contact the bolts when the bolts separate from said rolling-ending sides of said cutting surfaces of said fixed rolling plates, thereby permitting dropping of the bolts from said stop plates;    a plurality of containers disposed below said stop plates, respectively, and having open upper ends; and    a plurality of bolt-guiding plates having upper ends that are disposed proximately below said stop plates, respectively, and lower ends that are disposed proximately above said upper ends of said containers, so as to be adapted to permit movement of the bolts on said bolt-guiding plates, thereby guiding the bolts from said stop plates into said upper ends of said containers, said bolt-guiding plates being adapted to be located between said rotating shaft and the bolts when the bolts move on said bolt-guiding plates.    
     
     
         3 . The thread-rolling machine as claimed in  claim 2 , wherein said stop plates are generally V-shaped so as to define a bolt-trapping space between a respective one of said stop plates and a respective one of said fixed rolling plates, thereby permitting movement of the bolts into said spaces when the bolts separate from said rolling-ending sides of said cutting surfaces of said fixed rolling plates.