Method and device for controlling driving of processing machine

Abstract

This invention relates to a sheet-fed offset printing press including a gear driven by an upstream drive motor, a gear rotationally driven by the upstream drive motor through the gear, an impression cylinder of an upstream printing unit group, and a transfer cylinder of a downstream printing unit group. The impression cylinder is rotationally driven by the gear and has a holding portion for holding a paper sheet W. The transfer cylinder is rotationally driven by a downstream drive motor and has a holding portion for receiving the paper sheet W from the holding portion of the impression cylinder. The printing press further includes an impression-cylinder-side peripheral speed measuring device for measuring the peripheral speed of the impression cylinder and a transfer-cylinder-side peripheral speed measuring device for measuring the peripheral speed of the transfer cylinder. The rotational phase difference between the impression and transfer cylinders is obtained from signals from the impression-cylinder-side and transfer-cylinder-side peripheral speed measuring devices.

1 . A method for controlling the driving of a processing machine,
 the processing machine including:
 first driven means driven by first driving means; 
 second driven means rotationally driven by the first driving means through the first driven means; 
 a first rotating part being rotationally driven by the second driven means and having a notched portion provided with a first holding portion for holding a workpiece; and 
 a second rotating part being rotationally driven by second driving means and having a notched portion provided with a second holding portion for receiving the workpiece from the first holding portion of the first rotating part, 
   wherein   the processing machine further comprises:
 first peripheral speed measuring means for measuring a peripheral speed of the first rotating part; and 
 second peripheral speed measuring means for measuring a peripheral speed of the second rotating part, and 
   a rotational phase difference between the first and second rotating parts is obtained from respective signals from the first and second peripheral speed measuring means.   
   
   
       2 . The method according to  claim 1 , wherein
 a speed deviation between the first and second rotating parts is obtained from the respective signals from the first and second peripheral speed measuring means, and   the rotational phase difference is obtained by integrating the speed deviation.   
   
   
       3 . The method according to  claim 2 , wherein
 a speed variation of the first rotating part is obtained from the signal from the first peripheral speed measuring means,   a speed variation of the second rotating part is obtained from the signal from the second peripheral speed measuring means, and   the speed deviation is obtained from the difference between the speed variations of the first and second rotating parts.   
   
   
       4 . The method according to  claim 3 , wherein
 an average speed of the first rotating part is obtained from the signal from the first peripheral speed measuring means,   the speed variation of the first rotating part is obtained from the difference between a peripheral speed of the first rotating part and the average speed of the first rotating part, the peripheral speed of the first rotating part being obtained from the signal from the first peripheral speed measuring means,   an average speed of the second rotating part is obtained from the signal from the second peripheral speed measuring means, and   the speed variation of the second rotating part is obtained from the difference between a peripheral speed of the second rotating part and the average speed of the second rotating part, the peripheral speed of the second rotating part being obtained from the signal from the second peripheral speed measuring means.   
   
   
       5 . The method according to  claim 1 , wherein the driving of the processing machine is stopped depending on the rotational phase difference. 
   
   
       6 . A device for controlling the driving of a processing machine,
 the processing machine including:
 first driven means driven by first driving means; 
 second driven means rotationally driven by the first driving means through the first driven means; 
 a first rotating part being rotationally driven by the second driven means and having a notched portion containing a first holding portion for holding a workpiece; and 
 a second rotating part being rotationally driven by second driving means and having a notched portion containing a second holding portion for receiving the workpiece from the first holding portion of the first rotating part, 
   the device comprising:
 first peripheral speed measuring means for measuring a peripheral speed of the first rotating part; 
 second peripheral speed measuring means for measuring a peripheral speed of the second rotating part; and 
 controlling means for obtaining a rotational phase difference between the first and second rotating parts from respective signals from the first and second peripheral speed measuring means. 
   
   
   
       7 . The device according to  claim 6 , wherein
 the controlling means
 obtains a speed deviation between the first and second rotating parts from the respective signals from the first and second peripheral speed measuring means, and 
 obtains the rotational phase difference by integrating the speed deviation. 
   
   
   
       8 . The device according to  claim 7 , wherein
 the controlling means
 obtains a speed variation of the first rotating part from the signal from the first peripheral speed measuring means, 
 obtains a speed variation of the second rotating part from the signal from the second peripheral speed measuring means, and 
 obtains the speed deviation from the difference between the speed variations of the first and second rotating parts. 
   
   
   
       9 . The device according to  claim 8 , wherein
 the controlling means
 obtains an average speed of the first rotating part from the signal from the first peripheral speed measuring means, 
 obtains the speed variation of the first rotating part from the difference between a peripheral speed of the first rotating part and the average speed of the first rotating part, the peripheral speed of the first rotating part being obtained from the signal from the first peripheral speed measuring means, 
 obtains an average speed of the second rotating part from the signal from the second peripheral speed measuring means, and 
 obtains the speed variation of the second rotating part from the difference between a peripheral speed of the second rotating part and the average speed of the second rotating part, the peripheral speed of the second rotating part being obtained from the signal from the second peripheral speed measuring means. 
   
   
   
       10 . The device according to  claim 6 , wherein the controlling means stops the driving of the processing machine depending on the rotational phase difference.