An image forming apparatus is provided which is capable of reliably preventing a recording sheet wound around a roller member from being further wound around the roller member even when the power supply of the image forming apparatus is turned onoff while the recording sheet is wound around the roller member. The blank has a hardened region formed from the first area and having a first hardness, and a non-hardened region adjoining the hardened region and formed from the second area, and having a second hardness that is less than the first hardness. The execution state of the process block is stored in the execution state management table. As the punch descends into the die, the fluid is pressurized. In addition, another production process comprises the step of carrying out a reaction between acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl acrylate, wherein the oxygen concentration of a gas phase portion of a reactor is maintained in the range of 0. In case the power supply path of UPS is switched from the normal power line to the bypass line, the UPS watchdog system of the present invention is firstly compulsively recovers again the power supply path to the normal power line for given times and, nevertheless, in case it is not recovered, the power is supplied through the bypass line.