Abstract: The nonvolatile semiconductor memory device comprises a memory cell array in which memory cell units having one or more reprogrammable nonvolatile memory cells are arranged in an array, a word line commonly connected to a same row of the one or more memory cells of the memory cell array, a data line commonly connected to a same column of the memory cell units of the memory cell array, sequence control section for controlling a sequence operation which reprograms data of the selected memory cell by a first operation for applying the voltage to reprogram data of the selected memory cell, and a second operation for verifying reprogrammed state of data to memory cell to which the voltage is applied, and voltage application section for applying to the first voltage higher than a power supply voltage to the word line corresponding to the memory cell to be data reprogrammed in the first period which is corresponds to at least partial period during a period of the first operation, in which in a second period correspo

Abstract: Plastic working method and apparatus are disclosed. The plastic work such as forging is carried out by partial pressing contact of a die with a partial portion of a workpiece. The die is moved in a swinging or circular rocking fashion. The plastic working apparatus comprises a lower die for supporting the workpiece; an upper die swingably provided in a swinging plane about a predetermined position for relatively depressing the workpiece with respect to the lower die in accordance with the swing motion and for performing the plastic work to the workpiece in cooperation with the lower die; and a moving mechanism for relatively moving the workpiece and the upper die within the swing plane during the working operation.

Abstract: A plastic working method and apparatus which performs swiveling motion of an upper die mounted on a die holder. A toggle mechanism is provided for power assisting function. The toggle mechanism includes a link and the die holder. Upper and lower end portion of the die holder are movably supported by upper and lower double eccentric rotary mechanisms for changing orientation of the die holder. The link is disposed within the die holder and has upper end supported by a machine frame and a lower end supported by the die holder. Orientation of the link is also changeable.

Abstract: Plastic working method and apparatus are disclosed. The plastic work such as forging is carried out by partial pressing contact of a die with a partial portion of a workpiece. The die is moved in a swinging or circular rocking fashion. The plastic working apparatus comprises a lower die for supporting the workpiece; an upper die swingably provided in a swinging plane about a predetermined position for relatively depressing the workpiece with respect to the lower die in accordance with the swing motion and for performing the plastic work to the workpiece in cooperation with the lower die; and a moving mechanism for relatively moving the workpiece and the upper die within the swing plane during the working operation.