Can making machine

Abstract

A can making machine includes a main body frame; a holding table supported by the main body frame to hold a cylindrical body; a processing table which is supported on the main body frame via a shaft section penetrating through the holding table in a direction of a table axis and disposed to face the holding table in the direction of the table axis, and on which a processing tool configured to process the cylindrical body is provided; a crank unit configured to cause the processing table to reciprocate with respect to the holding table in the direction of the table axis; a table index unit configured to intermittently rotationally move the holding table about the table axis with respect to the processing table; a first drive motor configured to drive the crank unit; and a second drive motor configured to drive the table index unit.

What is claimed is: 
     
         1 . A can making machine comprising:
 a main body frame;   a holding table which is supported by the main body frame and holds a cylindrical body;   a processing table which is supported on the main body frame via a shaft section penetrating through the holding table in a direction of a table axis and disposed to face the holding table in the direction of the table axis, and on which a processing tool configured to process the cylindrical body is provided;   a crank unit which causes the processing table to reciprocate with respect to the holding table in the direction of the table axis;   a table index unit which intermittently rotationally moves the holding table about the table axis with respect to the processing table;   a first drive motor which drives the crank unit; and   a second drive motor which drives the table index unit.   
     
     
         2 . The can making machine according to  claim 1 , wherein the crank unit comprises:
 a drive shaft;   a crank shaft connected to the drive shaft and rotated about a central axis of the drive shaft with rotation of the drive shaft; and   a connecting rod configured to connect the crank shaft and the shaft section, and   the can making machine further comprises:   a detecting unit capable of detecting a crank angle which is at a position in a circumferential direction of the crank shaft along a central axis of the drive shaft; and   a control unit which controls a rotational speed of the second drive motor on the basis of the crank angle detected by the detecting unit.   
     
     
         3 . The can making machine according to  claim 2 , wherein, when the crank angle detected by the detecting unit is in a range of an index period including a top dead center which is at a position at which the processing table is farthest from the holding table, the control unit enhances the rotational speed of the second drive motor as compared with a case in which the crank angle is in a range of a dwell period outside of the range of the index period in the crank angle. 
     
     
         4 . The can making machine according to  claim 2 , wherein the detecting unit is an angular position detecting sensor. 
     
     
         5 . The can making machine according to  claim 3 , wherein the detecting unit is an angular position detecting sensor. 
     
     
         6 . The can making machine according to  claim 1 , wherein the second drive motor is a servomotor. 
     
     
         7 . The can making machine according to  claim 1 , further comprising:
 a supply wheel configured to supply the cylindrical body to the holding table;   a discharge wheel configured to discharge the cylindrical body from the holding table; and   a wheel index unit configured to intermittently rotate the supply wheel and the discharge wheel about each wheel axis in synchronization with intermittent rotation about the table axis of the holding table,   wherein the wheel index unit is driven by the second drive motor.   
     
     
         8 . The can making machine according to  claim 1 , further comprising:
 a supply wheel configured to supply the cylindrical body to the holding table;   a discharge wheel configured to discharge the cylindrical body from the holding table; and   a wheel index unit configured to intermittently rotate the supply wheel and the discharge wheel about each wheel axis in synchronization with intermittent rotation about the table axis of the holding table,
 wherein the wheel index unit is driven by a third drive motor.