Can body maker and frame for drive mechanism

Abstract

A can body maker includes a ram shaft extending in a front-rear direction, a punch disposed at a front end portion of the ram shaft, a reciprocating linear motion mechanism connected to a rear end portion of the ram shaft to reciprocate and linearly move the ram shaft in the front-rear direction, a die having a through hole into which the punch is inserted, a cup holding mechanism which presses a cup-shaped body against an end face in which the through hole of the die opens, and a cup holder drive mechanism that oscillates the cup holding mechanism in the front-rear direction, wherein the cup holder drive mechanism has a cam structure and is disposed directly below the cup holding mechanism.

What is claimed is: 
     
         1 . A can body maker comprising:
 a ram shaft extending in a front-rear direction;   a punch disposed at a front end portion of the ram shaft;   a reciprocating linear motion mechanism connected to a rear end portion of the ram shaft to reciprocate and linearly move the ram shaft in the front-rear direction;   a die having a through hole into which the punch is inserted;   a cup holding mechanism pressing a cup-shaped body against an end face in which the through hole of the die opens; and   a cup holder drive mechanism that oscillates the cup holding mechanism in the front-rear direction,   wherein the cup holder drive mechanism has a cam structure and is disposed directly below the cup holding mechanism.   
     
     
         2 . The can body maker according to  claim 1 , further comprising:
 a gear transmitting a rotational driving force around a rotation axis of the reciprocating linear motion mechanism to the cup holder drive mechanism.   
     
     
         3 . The can body maker according to  claim 1 ,
 wherein the cup holder drive mechanism has   a cam which is rotated,   an oscillation unit oscillated by being in contact with the cam, and   a pair of arms disposed on both sides of the ram shaft and oscillate together with the oscillation unit to move the cup holding mechanism back and forth.   
     
     
         4 . The can body maker according to  claim 1 ,
 wherein the cup holding mechanism has   a cup holder sleeve, and   a biasing unit allowing the cup holder sleeve to be biased forward with air pressure.   
     
     
         5 . The can body maker according to  claim 1 , further comprising:
 a bearing supporting the ram shaft to be slidable in the front-rear direction,   wherein the cup holder drive mechanism is disposed directly below the bearing.   
     
     
         6 . The can body maker according to  claim 1 , further comprising:
 bearings supporting the ram shaft to be slidable in the front-rear direction,   wherein a pair of the bearings are provided at an interval in the front-rear direction, and   wherein the pair of bearings are integrally formed.   
     
     
         7 . A frame for a drive mechanism provided in a can body maker having a ram shaft which has a punch provided at a front end portion thereof, a die in which a through hole into which the punch is inserted is formed and a cup-shaped body extruded by the punch is passed through the through hole to perform drawing processing and ironing processing on the cup-shaped body, a cup holder which presses the cup-shaped body against an end face of the die, and a drive mechanism reciprocating the ram shaft, to house the drive mechanism,
 wherein the drive mechanism has a reciprocating linear motion mechanism reciprocating the ram shaft,   wherein the reciprocating linear motion mechanism has a housing in a cylindrical shape, and   wherein the frame for a drive mechanism is formed by side plates, a bottom plate, a front plate, and a back plate being integrally fixed to each other, and a circular opening surrounding a circumferential surface of the housing to house the reciprocating linear motion mechanism is integrally formed in the back plate.   
     
     
         8 . The frame for a drive mechanism according to  claim 7 ,
 wherein the drive mechanism has a cup holder drive mechanism reciprocating the cup holder, and   wherein the cup holder drive mechanism is supported between the front plate and the back plate.   
     
     
         9 . The frame for a drive mechanism according to  claim 8 , wherein a gear transmitting a rotational force of the reciprocating linear motion mechanism to the cup holder drive mechanism is rotatably formed in the reciprocating linear motion mechanism. 
     
     
         10 . The frame for a drive mechanism according to  claim 7 , wherein the back plate extends upward more than the front plate. 
     
     
         11 . The frame for a drive mechanism according to  claim 7 , wherein a part of the front plate is attachably and detachably formed. 
     
     
         12 . The frame for a drive mechanism according to  claim 7 , wherein an extension portion in which the die is disposed is integrally fixed to an outside of the side plate. 
     
     
         13 . A can body maker which includes the frame for a drive mechanism according to  claim 1 , comprising at least:
 the frame for a drive mechanism; and   the reciprocating linear motion mechanism.