Numerical control system having a symmetrical path generation means

Claim 1

A system generating symmetrical paths for numerical control, characterized in that the system comprises (1) an input medium for numerical control, said input medium carrying positional information convertible into increments in a device, and instruction information, said instruction information including sets of instruction blocks, each set of instruction blocks being adapted to continue the function of one instruction until another instruction interrupts the function of said one instruction, said instruction information being so edited as to apply one instruction to the first block and the last block of that set of instruction blocks, which set is to continue the function of said one instruction; (2) an input means reading the input medium both in the forward and reverse directions; (3) a circuit producing forward-interpolating-information from the input medium information for forwardly moving along a path as defined by each instruction block; (4) a circuit producing reverse-interpolating-information from the input medium information for reversely moving along a path as defined by each instruction block; (5) an interpolating circuit producing pulse series from the interpolating information; (6) a circuit driving various shafts of a machine tool in response to the pulse series; and (7) a symmetrical path control circuit which controls whether the input means reads the input medium forwardly or reversely, which one of the forward-interpolating-information producing circuit and the reverse-interpolating-information producing circuit should operate, and whether the interpolating circuit reverses the moving direction in each axis or not; whereby, in case of generating the path as defined by the input medium information, the input medium is read forwardly, forward-interpolating-information is produced, and the pulse series are produced without changing the moving direction in any axis; in case of generating a path which is axially symmetrical with the path as defined by the input medium information relative to a line parallel to one axis of coordinates, the input medium is reversely read, reverse-interpolating-information is produced, and the pulse series are produced while reversing the moving direction in the other axis of the coordinates; and in case of generating a path which is symmetrical with the path as defined by the input medium information relative to a point, the input medium is forwardly read, forward-interpolating-information is produced, and pulse series are produced while reversing the moving direction in each axis of the coordinates.

Claim 2

A system generating symmetrical paths for numerical control, characterized in that the system comprises (1) an input medium for numerical control, said input medium carrying positional information convertible into increments in a device, and instruction information, said instruction information including sets of instruction blocks, each set of instruction blocks being adapted to continue the function of one instruction until another instruction interrupts the function of said one instruction, said instruction information being so edited as to apply one instruction to the first block and the last block of that set of instruction blocks, which set is to continue the function of said one instruction; (2) an input means reading the input medium both in the forward and reverse directions; (3) a circuit producing forward-interpolating-information from the input medium information for forwardly moving along a path as defined by each instruction block; (4) a circuit producing reverse-interpolating-information from the input medium information for reversely moving along a path as defined by each instruction block; (5) an interpolating circuit producing pulse series from the interpolating information; (6) a circuit driving various shafts of a machine tool in response to the pulse series; and (7) a symmetrical path control circuit which controls whether the input means reads the input medium forwardly or reversely, which one of the forward-interpolating-information producing circuit and the reverse-interpolating-information producing circuit should operate, and whether the interpolating circuit reverses the moving direction in each axis or not; whereby, in case of generating the path as defined by the input medium information, the input medium is read forwardly, forward-interpolating-information is produced, and the pulse series are produced without changing the moving direction in any axis; in case of generating a path which is axially symmetrical with the path as defined by the input medium information relative to a line parallel to one axis of coordinates, the input medium is reversely read, reverse-interpolating-information is produced, and the pulse series are produced while reversing the moving direction in the other axis of the coordinates; and in case of generating a path which is symmetrical with the path as defined by the input medium information relative to a point, the input medium is forwardly read, forward-interpolating-information is produced, and pulse series are produced while reversing the moving direction in each axis of the coordinates.