Press system

Abstract

A press system capable of achieving improvement in production rate is provided. A controller has a slide driven upward and downward based on a prescribed press motion. A position of the slide where a workpiece can be transported without interfering with an upper die is defined as a feed-allowable height. A stand-by height is higher than the feed-allowable height and located at a highest position in the press motion. The controller also has the work transported while the slide is moving between the feed-allowable height and the stand-by height.

1 . A press system comprising:
 a press portion including an electric motor, an eccentric mechanism configured to convert a rotary motion by the electric motor into a motion in an upward and downward direction, a slide to which an upper die is attachable, the slide being driven upward and downward with the eccentric mechanism being interposed, and a bolster to which a lower die is attachable, the press portion being configured to press work a workpiece by upward and downward movement of the slide with respect to the bolster;   a transportation portion configured to transport the workpiece; and   a controller configured to control the press portion and the transportation portion,   the controller being configured to have the slide driven upward and downward based on a prescribed press motion,   with a position of the slide where the workpiece can be transported without interfering with the upper die being defined as a feed-allowable height, and a position higher than the feed-allowable height and highest in the press motion being defined as a stand-by height,   the controller being also configured to have the workpiece transported while the slide is moving between the feed-allowable height and the stand-by height.   
     
     
         2 . The press system according to  claim 1 , wherein
 the controller is configured to start transportation of the workpiece by the transportation portion while the electric motor is decelerated.   
     
     
         3 . The press system according to  claim 1 , wherein
 the controller is configured to start transportation of the workpiece by the transportation portion while the slide is moving from the feed-allowable height to the stand-by height.   
     
     
         4 . The press system according to  claim 2 , wherein
 the controller starts deceleration of the electric motor after the slide passes the feed-allowable height as the slide moves upward.   
     
     
         5 . The press system according to  claim 1 , wherein
 the controller is configured to have the transportation portion complete transportation of the workpiece while the electric motor is accelerated.   
     
     
         6 . The press system according to  claim 1 , wherein
 the controller is configured to have the transportation portion complete transportation of the workpiece while the slide is moving from the stand-by height to the feed-allowable height.   
     
     
         7 . The press system according to  claim 5 , wherein
 the controller is configured to complete acceleration of the electric motor before the slide passes the feed-allowable height as the slide is moved downward.   
     
     
         8 . The press system according to  claim 5 , wherein
 the transportation portion includes a feed completion detector configured to detect completion of transportation of the workpiece,   the controller sets a monitoring position at a position higher than the feed-allowable height and lower than the stand-by height in the upward and downward direction of the slide, and   the controller sets the stand-by height and the monitoring position such that the slide can be stopped at a position higher than the feed-allowable height when completion of transportation of the workpiece has not been detected at a time point when the slide lowered from the stand-by height reaches the monitoring position.   
     
     
         9 . The press system according to  claim 1 , wherein
 the controller has the electric motor alternately rotate in forward and reverse directions each time press working is performed.   
     
     
         10 . The press system according to  claim 1 , wherein
 the electric motor is implemented by a servo motor.