Boots – shoes – and leggings
Patent
1984-11-28
1987-09-08
Fleming, Michael R.
Boots, shoes, and leggings
364143, 364174, 364175, 364474, 318565, 318567, 318569, 318601, 377 16, 377 20, 82 2B, G05B 1918, G05B 2302
Patent
active
046928561
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a numerical control method and, more particularly, to a numerical control method well-suited for application to a machine tool such as multi-spindle automatic lathe.
As shown in FIG. 1, a multi-spindle automatic lathe, which is for the purpose of shortening machining time and fostering mass production, has a number of mutually independently movable shafts (tools) TL.sub.1 through TL.sub.3 arrayed about a workpiece WK. The arrangement is such that the lathe subjects the workpiece WK to prescribed machining by applying machining performed by one tool followed by machining performed by a subsequent one of the tools when the preceeding machining is completed. However, in order to make it possible to control the movement of each tool independently in such a multi-spindle automatic lathe, a cam rotated by a rotary shaft, not shown, is provided for each and every tool, and it is arranged so that the workpiece is subjected to prescribed machining by moving the tools toward the workpiece independently due to rotation of the cams. This results in structural complexity and higher cost. Furthermore, though multi-spindle automatic lathes may be controlled numerically, the creation of NC data is troublesome.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a novel numerical control method in which such cams are unnecessary, and through which NC data can be created in a simple manner and numerical control performed on the basis of such NC data.
Another object of the present invention is to provide an effective numerical control method for use in controlling a multi-spindle automatic lathe.
A further object of the present invention is to provide a numerical control method whereby there is created NC data which indicates the correspondence between time and position for every axis of movement, or NC data which indicates the correspondence between a rotational angle of a predetermined rotary shaft and position for every axis of movement. Formation in accordance with information, whenever elapsed time or the rotational angle of the rotary shaft becomes equal to a time or rotational angle specified by NC data in a currently prevailing block, a position along a predetermined axis of movement is controlled in accordance with NC data in a succeeding block.
The present invention provides a numerical control method which includes creating, for every axis of movement, a relation between time and a position along the axis of movement or a relation between a rotational angle and a position along the axis of movement, the relation serving as numerical control data; controlling each axis of movement based on the numerical control data; monitoring elapsed time or the rotational angle; and, whenever the elapsed time or rotational angle attains a time or rotational angular position specified by the numerical control data for each axis of movement, controlling the axis of movement in accordance with succeeding numerical control data. According to this numerical control method, NC data can be created in simple fashion so that the method is well-suited for use in controlling a multi-spindle automatic lathe or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 schematically illustrates a multi-spindle lathe;
FIG. 2 is a block diagram of an NC apparatus to which the present invention is applied;
FIG. 3 is a illustrates a machined shape according to the present invention;
FIG. 4 illustrates curves showing the relation between position and time for each axis of movement for the purpose of obtaining the machined shape shown in FIG. 3;
FIG. 5 illustrates the NC data used to obtain the machined shape shown in FIG. 3;
FIG. 6 is a block diagram of a pulse distributor circuit in FIG. 2;
FIG. 7 is another block diagram of an NC apparatus to which the present invention is applied; and
FIG. 8 is a block diagram of a pulse distributor circuit in FIG. 7.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 2 is a block diagram of a first embodiment of the present invention. He
REFERENCES:
patent: 4104726 (1978-08-01), Fisk et al.
patent: 4245298 (1981-01-01), Slater
patent: 4397031 (1983-08-01), Weber
patent: 4423365 (1983-12-01), Turner
patent: 4469993 (1984-09-01), Swanson et al.
patent: 4510426 (1985-04-01), Michaels et al.
patent: 4549260 (1985-10-01), Saito et al.
Fanuc Ltd.
Fleming Michael R.
Lastova John R.
LandOfFree
Position control of multiple tools based on elapsed time of tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position control of multiple tools based on elapsed time of tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position control of multiple tools based on elapsed time of tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2162532