Automatic die-interchanging control system of a press machine

DETAILED DESCRIPTION OF THE INVENTION Referring now to FIG.
1, a typical operation of die-interchanging in a press machine consists of used-die-demounting steps from 1 to the N, a bolster driving step, and new-die-mounting steps from NX to 1X.
Hereupon, the used-die-demounting step is a step for demounting a used die (die which has been mounted on the press machine), the bolster driving step is a step for transferring the used die on a bolster from a predetermined location on the press machine to a predetermined location away from the press machine and for transferring a new die (die to be mounted and used hereafter) on the bolster from a predetermined location away from the press machine to a predetermined location on the press machine, and the new-die-mounting step is a step for mounting the new die on the press machine.
The new-die mounting steps consist of completely reverse operations to the used-die-demounting steps.
That is, step NX of the new-die-mounting steps operates in reverse order to step N of the used-die-demounting steps, and in the same way each step from N-1 to 1X of the new-die-mounting steps operates in reverse order to each corresponding step from N-1 to 1.
According to this invention, the automatic die-interchanging control is possible from any step among the above mentioned steps.
Referring to FIGS.
2 through 4, lines 101, 102 and 103 shown in FIG.
2 are connected to the corresponding lines 101, 102 and 103 shown in FIG.
3, respectively, and lines 102 and 101 shown in FIG.
3 are respectively connected to the corresponding lines 102 and 101 shown in FIG.
4.
FIG.
2 relates to a control circuit unit which enables to start automatic control of die-interchanging, FIG.
3 to an output control circuit unit which controls each step, and FIG.
4 to an indication lamp lighting control circuit unit which controls lighting and flickering of each indication lamp.
For the convenience of explanation, the same reference symbols are used on relay contacts which are driven by the same relay coil in FIGS