Press system and control method of press system

A control method of a press system, the press system including a holding device configured to hold a coil material, a press machine configured to perform progressive stamping press in which several stamping actions are performed in a plurality of stages, and a feeding device configured to feed the coil material held by the holding device to the press machine, wherein

• the feeding device includes rolls configured to convey the coil material to the press machine in a closed state in which the coil material is clamped therebetween and be brought into an open state in which the coil material is released when stamping by the press machine is started,
• the press machine includes;
• load detection means configured to detect a load at a time of the stamping;
• a pin configured to be inserted into a hole pierced in the coil material for positioning at the time of the stamping;
• and
• control means configured to control the feeding device and the press machine to perform the stamping in coordination with each other, and
• the control method includes controlling, by the control means, the feeding device for switching the rolls from the closed state to the open state at a timing before the load is detected by the load detection means, wherein the timing is based on a length of the pin.