Can forming machine

Abstract

A can forming machine includes a can body holder in which the can body does not fall at an unexpected time. A knockout unit has a knocking out piston which is disposed to be movable in a depth direction of a recess and is provided to be displaceable between a protruding position at which the knocking out piston protrudes into the recess and an recessed position at which the knocking out piston exits the recess, and a cylinder which supports the knocking out piston to be displaceable. At a discharge position, at which the formed can body is discharged from the recess of the can body holder, a piston displacing unit, which displaces the knocking out piston from the recessed position toward the protruding position, is provided adjacent to the other surface side of the base.

What is claimed is: 
     
         1 . A can forming machine comprising:
 a turntable in which a plurality of can body holders configured to detachably hold a can body are annularly arranged on one surface side of a base in a disc shape, wherein   the can body holders have a recess into which a bottom side of the can body can be inserted, and a knockout unit,   the knockout unit has a knocking out piston which is disposed to be movable in a depth direction of the recess and is provided to be displaceable between a protruding position at which the knocking out piston protrudes into the recess and an recessed position at which the knocking out piston exits the recess, and a cylinder which supports the knocking out piston to be displaceable, and   at a discharge position at which the formed can body is discharged from the recess of the can body holders, a piston displacing unit which displaces the knocking out piston from the recessed position toward the protruding position is provided adjacent to the other surface side of the base.   
     
     
         2 . The can forming machine according to  claim 1 , wherein an opening through which one surface side and the other surface side of the base communicate with each other is formed in a part of the base in which the can body holders are disposed. 
     
     
         3 . The can forming machine according to  claim 1 , wherein the piston displacing unit is a gas valve connected to a gas pressure adjusting unit which feeds gas into the cylinder. 
     
     
         4 . The can forming machine according to  claim 2 , wherein the piston displacing unit is a gas valve connected to a gas pressure adjusting unit which feeds gas into the cylinder. 
     
     
         5 . The can forming machine according to  claim 3 , wherein the gas valve is further disposed to one or more positions between a position subsequent to the discharge position to an introduction position along a rotational direction of the turntable, and is not disposed between the position subsequent to the introduction position and a position previous to the discharge position. 
     
     
         6 . The can forming machine according to  claim 4 , wherein the gas valve is further disposed to one or more positions between a position subsequent to the discharge position to an introduction position along a rotational direction of the turntable, and is not disposed between the position subsequent to the introduction position and a position previous to the discharge position. 
     
     
         7 . The can forming machine according to  claim 3 , wherein the gas valve is disposed to each position between the discharge position and an introduction position at which the can body before forming is introduced into the recess, and the gas pressure adjusting unit feeds gas into the cylinder via the gas valve and suctions the interior of the cylinder to displace the knocking out piston from the protruding position toward the recessed position. 
     
     
         8 . The can forming machine according to  claim 4 , wherein the gas valve is disposed to each position between the discharge position and an introduction position at which the can body before forming is introduced into the recess, and the gas pressure adjusting unit feeds gas into the cylinder via the gas valve and suctions the interior of the cylinder to displace the knocking out piston from the protruding position toward the recessed position. 
     
     
         9 . The can forming machine according to  claim 5 , wherein the gas valve is disposed to each position between the discharge position and an introduction position at which the can body before forming is introduced into the recess, and the gas pressure adjusting unit feeds gas into the cylinder via the gas valve and suctions the interior of the cylinder to displace the knocking out piston from the protruding position toward the recessed position. 
     
     
         10 . The can forming machine according to  claim 6 , wherein the gas valve is disposed to each position between the discharge position and an introduction position at which the can body before forming is introduced into the recess, and the gas pressure adjusting unit feeds gas into the cylinder via the gas valve and suctions the interior of the cylinder to displace the knocking out piston from the protruding position toward the recessed position. 
     
     
         11 . A can body holder comprising:
 a recess which receives a lower portion of a can body;   a can body holding unit disposed to an inner circumferential surface side of the recess; and   a knockout unit disposed to a bottom surface side of the recess, wherein   the can body holding unit comprises an elastic part partially exposed on the inner circumferential surface of the recess, and   the knockout unit comprises a knockout cylinder, and a knocking out piston supported inside the knockout cylinder to be movable in an axis direction of the knockout cylinder.   
     
     
         12 . The can body holder according to  claim 11 , wherein
 the elastic part is in a ring shape having a rectangular cross section, made of rubber,   a hollow portion is formed in the rectangular cross section, and   a first gas pressure adjusting unit configured to apply a gas pressure from outside to an inside of the hollow portion is connected to the elastic part.   
     
     
         13 . The can body holder according to  claim 11 , wherein
 a substantially cylindrical cylinder shape is formed in the knockout cylinder,   a pressure adjusting hole is disposed to the knockout cylinder to release an air compressed in the knockout cylinder by movement of the knocking out piston.   
     
     
         14 . The can body holder according to  claim 12 , wherein
 a substantially cylindrical cylinder shape is formed in the knockout cylinder,   a pressure adjusting hole is disposed to the knockout cylinder to release an air compressed in the knockout cylinder by movement of the knocking out piston.