Boots – shoes – and leggings
Patent
1986-09-22
1988-03-29
Smith, Jerry
Boots, shoes, and leggings
364171, G06F 1546
Patent
active
047348453
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Background of the Invention
This invention relates to a trajectory display system so adapted as to simultaneously display a still picture, inclusive of a machining region, and a trace of a path of trajectory in order to display the machined profile of a workpiece on a display unit in, e.g., a numerically controlled machine tool.
Machine tools are numerically controlled in order to automate machining. In order to have a numerically controlled machine tool subject a workpiece to machining as specified by a design drawing, a numerical control command having a predetermined format must be applied to a numerical control unit.
FIG. 2 is a schematic diagram illustrating a four-axis numerically controlled lathe, which is a numerically controlled machine tool. As illustrated, the numerically controlled machine tool drives a table TBL of a machine tool SM in X and Y directions in accordance with a numerical control command from a numerical control unit NC, thereby establishing relative movement between a workpiece WK, set on the table TBL, and a tool CT so that the workpiece WK is machined into a desired profile by the tool CT. Since the tool is cooled by using a cutting oil, or the like, the machine tool is provided with a cover so that the cutting oil and cuttings will not scatter. For this reason, the state of machining is difficult to observe from the outside. Accordingly, the numerical control unit NC displays a trajectory TRC of the tool CT on its display DP so that the operator may readily verify the state of machining.
If the trajectory TRC of the tool CT is displayed on the display DP before operating the machine, when a numerical control command is applied to the numerical control unit NC in accordance with a design drawing for a workpiece having a complicated machined profile, then a program can be easily created while the input data are confirmed.
A trajectory display system is known in which a still picture inclusive of machining regions and a trace of a trajectory are displayed simultaneously in color on the display DP. With a trajectory display system of this type, it is preferred that the trajectory of each cutting tool and the machining region be displayed in different colors in cases where the machining of a workpiece by a plurality of cutting tools is simulated and displayed. This is particularly true in the case of a four-axis lathe.
In the conventional display system the machining region, which is removed from the workpiece by being machined away by the cutting tool, is displayed by removing the background color from the workpiece. To this end, the conventional display system stores machining region data in a stored picture separate from that of still picture data, which is for displaying the workpiece profile. These data are superimposed in a suitable manner to display the machined state of the workpiece. Moreover, in order to prevent a trajectory that passes through the machining region of the workpiece from disappearing together with the machining region owing to the background color, the data that constitute the trajectory trace must be stored beforehand as a stored picture separate from the still picture data for displaying the workpiece profile. With the conventional system, therefore, in order to display one trajectory together with a still picture inclusive of the machining region for the purpose of controlling the color display, data must be stored in the form of at least three stored pictures. The problem that arises is the high cost of the memory and control circuitry.
Moreover, when a color display is made by designating a trajectory in the form of a bit pattern of the three colors R (red), G (green), B (blue) based on three stored pictures, a complicated display control mechanism is needed to make the color of a trajectory which passes through a machining region removed from the workpiece by cutting tool movement the same as that of a trajectory display in the background color of the workpiece.
SUMMARY OF THE INVENTION
An object of the present invention is to prov
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Iwagaya Takashi
Kawamura Hideaki
Matsumura Teruyuki
Fanuc Ltd
Hoang Steve L.
Smith Jerry
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