Boots – shoes – and leggings
Patent
1989-06-16
1991-01-01
Smith, Jerry
Boots, shoes, and leggings
36447435, G05B 1918
Patent
active
049823361
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a tracer control apparatus and, more particularly, to a tracer control apparatus which makes it possible to trace a model while continuously rotating a tracer head.
BACKGROUND ART
As shown in FIG. 7, tracer control usually involves detecting axial displacements .epsilon..sub.x, .epsilon..sub.y, .epsilon..sub.z of a stylus 1, which is in contact with a model, by means of a tracer head 2, computing a resultant displacement .epsilon. ##EQU1## obtained by combining the axial displacements by means of a mixing circuit 3, obtaining an error .sub..DELTA. .epsilon. between the resultant displacement .epsilon. and a reference displacement .epsilon..sub.o by an adder circuit 4, generating a normal-direction velocity signal V.sub.N in a velocity signal generator 5 based on the characteristic .sub..DELTA. .epsilon.-V.sub.N, and generating a tangent-direction velocity signal V.sub.T in a velocity signal generator 5 based on the characteristic .sub..DELTA. .epsilon.-V.sub.T. Meanwhile, a tracing direction arithmetic circuit 7 generates cos.theta. and sin.theta. in a tracing direction .theta. using axial displacements .epsilon..sub.1, .epsilon..sub.2 lying in a tracer control plane and outputted by a changeover circuit 8, and an axial velocity signal generator 9 generates axial velocities V.sub.1, V.sub.2 in the tracer control plane using V.sub.N, V.sub.t, cos.theta. and sin .theta., thereby moving the stylus 1 along the model at these velocities. Tracer control is executed by subsequently repeating similar processing.
In a case where a model MDL possesses a steep incline, such as a hollow HL having vertical walls, as shown in FIG. 8, the foregoing tracer control method is such that when the stylus 1 is moved along a vertical wall portion SL, a corner portion 2a of the tracer head 2 is obstructed by the model MDL and tracing cannot be performed.
Accordingly, an object of the invention is to provide a tracer control apparatus which enables a tracer head to trace a model without impedement even if the model profile has projections and cavities of a kind that obstruct the tracer head.
Another object of the invention is to provide a tracer control apparatus which enables a model to be traced while the tracer head is continuously rotated and arranged so as not to be obstructed by the model.
DISCLOSURE OF THE INVENTION
In accordance with the tracer control apparatus of the present invention, it is arranged for a tracer head to be rotatable in a direction which adopts, as an axis of rotation, an axis parallel to an axis which does not form a tracing plane, and an angle of rotation in this rotational direction is monitored. Axial displacements along two axes forming the tracing plane are corrected based on the angle of rotation, and tracer control is performed using each of the axial displacements obtained by the correction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(a)+(b) are views for describing the general features of the present invention, in which (a) is an XZ sectional view and (b) a YZ sectional view;
FIG. 2; is a block diagram of a tracer control system according to the invention;
FIG. 3 is a block diagram of a tracer control unit;
FIG. 4 is a view for describing displacement correction computations based on B-axis rotation;
FIG. 5 is a view for describing a detection principle for detecting inclination of a model surface;
FIG. 6 is a view for describing a tracer head rotating mechanism; and
FIGS. 7 and 8 are views for describing a problem encountered in the prior art.
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a view for describing the general features of the present invention, in which (a) is an XZ sectional view and (b) a YZ sectional view.
ST represents a stylus, TC a tracer head, MDL a model, HL a hollow in the model, and SL, SL' vertical walls.
It is arranged for the tracer head TC to be rotatable in a rotational direction which adopts, as an axis of rotation, an axis parallel to an axis [e.g., the Y axis in FIG. 1(a)] which does not form a tracing plan
REFERENCES:
patent: 4296473 (1981-10-01), Imazeki et al.
patent: 4433275 (1984-02-01), Imazeki et al.
patent: 4646225 (1987-02-01), Matsuura
patent: 4814998 (1989-03-01), Aramaki
Fanuc Ltd.
Gordon Paul
Smith Jerry
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