Puncher

Abstract

In a puncher, with respect to a cylindrical cover with a one-end opening hole, a piercing punch is loosely but not movably inserted. A tip end surface of the piercing punch is protruded out from the one-end opening hole of the cover. A cylindrical stripper provided between the cover and the piercing punch is provided detachably from the one-end opening hole. By a biasing member, the stripper is protruded out from the one-end opening hole more than the piercing punch does. When the stripper is pressed in against biasing force of the biasing member, the tip end surface of the piercing punch becomes to protrude out from a through-hole formed at a protruding end of the stripper. A removal-prevention member which prevents the stripper from removing from the cover is provided detachably with respect to the cover.

1 .- 11 . (canceled) 
     
     
         12 . A puncher comprising:
 a cylindrical cover with a one-end opening hole;   a piercing punch, a tip end surface of which is protruded from the one-end opening hole, and which is loosely but not movably inserted with respect to the cover;   a cylindrical stripper provided between the cover and the piercing punch which is removable from the one-end opening hole;   a biasing member by which the stripper protrudes out from the one-end opening hole more than the piercing punch; and   wherein, when the stripper is pressed in against biasing force of the biasing member, the tip end surface of the piercing punch protrudes out from a through-hole formed at a protruding end of the stripper, by the pressing of the stripper against the biasing force of the biasing member, the tip end face of the piercing punch protrudes out, a removal-prevention member which prevents the stripper from being removed from the cover is provided detachably with respect to the cover.   
     
     
         13 . The puncher according to  claim 12  further comprising a ring member between the biasing member and the stripper. 
     
     
         14 . The puncher according to  claim 12 , wherein the piercing punch has a shank member on the tip end face thereof which protrudes out from the stripper and a punched-put piece of the workpiece remaining within the stripper is cleared out by the shaft member. 
     
     
         15 . The puncher according to  claim 12 , wherein the biasing member is made of a compression coil spring. 
     
     
         16 . The puncher according to  claim 12 , wherein, when the removal-prevention member is removed from the cover and then the stripper is pulled out from the cover, the tip end of the piercing punch is protruding out from the cover so as to allow positioning of the piercing punch. 
     
     
         17 . The puncher according to  claim 13 , wherein the piercing punch has a shank member the tip end face thereof which protrudes out from the stripper and a punched-put piece of the workpiece remaining within the stripper is cleared out by the shaft member. 
     
     
         18 . The puncher according to  claim 13 , wherein the biasing member is made of a compression coil spring. 
     
     
         19 . The puncher according to  claim 13 , wherein, when the removal-prevention member is removed from the cover and then the stripper is pulled out from the cover, the tip end of the piercing punch is protruding out from the cover so as to allow positioning of the piercing punch.