Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1989-09-13
1990-10-16
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
3185681, 3185682, 36447423, G05B 1918
Patent
active
049638033
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to an improvement applicable to a numerically controlled machine tool. More specifically, this invention relates to an improvement applicable to a numerically controlled machine tool, for the purpose to enable a group of numerical control equipment to control a numerically controlled machine tool having plural axes and plural driving shafts.
BACKGROUND OF THE INVENTION
A numerically controlled machine tool is generally provided with plural axes and plural driving shafts such as spindles, feeder shafts or the like. Such a numerically controlled machine tool as is provided with plural axes generally requires a large scale numerical control equipment having plural control elements. Since such large scale numerical control equipment is complicated in structure.
This invention employs plural small scale numerical control equipment, which is simple in structure, in parallel to each other, in order to control the foregoing numerically controlled machine tool having plural axes.
This idea can be applied to machining wherein relative motion is required between different spindles, between one or more spindles and one or more feeder shafts, and/or, between different feeder shafts. To achieve this, each control equipments for driving shafts and each negative feedback circuits which feeds back signals representing the angular position (hereinafter referred to as angular position signals) of the shafts to the control equipments is required to be connected with the numerical control equipment which controls another axis that must rotate to keep the foregoing relative motion. However, a numerically controlled machine tool that can be connected to for driving a shaft and that including a negative feedback circuit which feeds back the angular position signal of the driving shaft to the control equipment and that includes a means for connecting relevant negative feedback circuit with the numerical control equipment which controls another axis which is required to rotate so as to maintain relative motion with the driving shaft, is not presently available.
SUMMARY OF THE INVENTION
An object of this invention is to provide a multi-axis numerically controlled machine tool provided with plural numerical control equipment which are small in capacity and simple in structure and that can effect relative motion among arbitrary driving shafts.
Another object of this invention is to provide a multi-axis numerically controlled machine tool provided with equipment for selectively connecting the control equipment of an arbitrary driving shaft and the negative feedback circuit providing an angular position signal for the arbitrary driving shaft with numerical control equipment for controlling another shaft which is required to rotate in connection with the arbitrary driving shaft; resultantly allowing the numerically controlled machine tool to maintain the relative motion among the aforementioned specific axes.
To achieve the aforementioned objects, a numerically controlled machine tool provided with plural axes and which is driven by plural driving motors (SP(n)) each of which is attached by an angular position sensing means (PSD(n)) is provided with:
(a) a plurality of numerical control means (CNC(n)) each of which is provided with a programmable controller (PMC(n)) for controlling the plural driving motors (SP(n)) in response to external numerical information, and
(b) a numerical control means changing-over means (COC) having plural changing-over circuits (COS(n)) for connecting each of the selected ones of the plural angular position sensing means (POS(n)) and of the control means of the driving motors and the corresponding seclected ones of the plural numerical control means (CNC(n)), in response to the changing-over signal (CO) generated by the plural programmable controllers (PMC(n)). As a result, each of the selected numerical control means (CNC(n)) is allowed to be fed, in the reverse sense, an arbitrarily selected one of the angular position signals (P(n)) sensed by t
REFERENCES:
patent: 4092720 (1978-05-01), Carey
patent: 4558419 (1985-12-01), Kanematsu
patent: 4684862 (1987-08-01), Rohrle
Bergmann Saul M.
Fanuc Ltd
Shoop Jr. William M.
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