Boots – shoes – and leggings
Patent
1993-10-01
1995-05-16
Envall, Jr., Roy N.
Boots, shoes, and leggings
36447424, 36447426, 395135, G06F 1546
Patent
active
054167159
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to CNC machine tools, industrial robots and graphic systems, and more particularly to an apparatus for graphically checking for spatial interference between a workpiece and a tool or the like during machining, in accordance with a machining program, by a CNC (Computer Numerically Controlled) machine tool by means of a graphic display.
BACKGROUND ART
At the present time, CNC machine tools with a graphic display include an apparatus for graphically checking for interference between machining cutters that cut a workpiece or between a cutter and a workpiece clamp(chuck), before machining the workpiece in accordance with an NC program, by means of CRT display showing simulation of the machining process of the workpiece as graphical images so that operators can find the interference.
This apparatus for graphically checking for interference between a workpiece and a tool, displays workpiece shapes before and after machining the workpiece, chuck shapes, tail stock shapes, tool shapes on cutting tables or the like on a CRT screen, and displays a tool path in which the tool moves in accordance with an NC program on the CRT screen, and allows to monitor the interference. An example of this apparatus will be explained below.
FIG. 1 is a drawing showing the structure of an apparatus for graphically checking for interference between a workpiece and a tool of a machining program disclosed in the prior art. This apparatus includes a host computer 1 controlling the general operations of a numerical controller, a graphic controller 2, connected to the host computer 1, which controls screen information having a plurality of graphic images, a NO.1 frame buffer 3, connected to the graphic controller 2, which stores screen information including a graphic image of a body (any part of a workpiece or a tool) for machining in accordance with a machining program, a NO.2 frame buffer 13, connected to the graphic controller 2, which stores other screen information including a graphic image of another body for machining in accordance with the machining program, a NO.1 P/S converter 4 that receives parallel signals from the NO.1 frame buffer 3, converts the parallel signals into serial signals, and outputs the serial signals in accordance with a command signal from the graphic controller 2, a NO.2 P/S converter 14 that receives parallel signals from the NO.2 frame buffer 13, converts the parallel signals into serial signals, and outputs the serial signals in accordance with another command signal from the graphic controller 2. The apparatus also includes a comparator 8 that receives outputs from the NO.1 P/S converter 4 and from the NO.2 P/S converter 14, compares the outputs continually, and outputs an interruption signal to the host CPU 1 when it detects interference.
The comparator 8 detects interference whether or not the pixel data in the comparator 8, previously set by the host computer 1, indicates two different bodies for interference checking, are input at the same time. When it is determined that the pixel data are input at the same time, then it determines that there is interference.
A video driver 6 outputs a video signal, as screen information, to the video display unit 10, on which the graphic images are displayed, after combining the output from the first P/S converter 4 with the output from the second P/S converter 14.
Furthermore, the host CPU 1, the graphic controller 2, the NO.1 frame buffer 3, and the NO.2 frame buffer 13 are all connected to a bus line 9.
FIG. 2 is a sample drawing showing graphic images displayed on a screen in the apparatus shown in FIG. 1. In FIG. 2, one screen information of a graphic image of a body to be displayed in red, stored in NO.1 frame buffer 3, is indicated as a graphic image. And another screen information of a graphic image of another body to be displayed in blue, stored in NO.2 frame buffer 13, is indicated as another graphic image. Screen information obtained by combining the screen information stored in NO.1 frame buffer 3 and the
REFERENCES:
patent: 4922440 (1990-05-01), Kawamura et al.
patent: 5043906 (1991-08-01), Jepson
patent: 5122966 (1992-06-01), Jansen et al.
patent: 5307454 (1994-04-01), Shin
patent: 5315523 (1994-06-01), Fujita et al.
Hamada Youichi
Kinoshita Jiro
Brown Thomas E.
Envall Jr. Roy N.
Fanuc Ltd.
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