Boots – shoes – and leggings
Patent
1989-07-28
1992-02-11
Ruggiero, Joseph
Boots, shoes, and leggings
33504, 36455102, 364560, 36447437, G06F 1546, G01B 2120
Patent
active
050880462
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a mounting for a surface-sensing stylus and to a machine for and a method of using the mounting for determining the profile of a workpiece. The scope of the invention is specified in the claims hereto.
SUMMARY OF THE INVENTION
The invention as claimed makes it possible to determine said profile in a coordinate positioning machine by means of a stylus which is moved over the profile in such a way that the engagement between the stylus and the profile is maintained continually during this movement and that the contact pressure between the stylus and the workpiece does not vary or does not vary excessively. Also, the invention makes it possible for the mounting to be of relatively simple construction, and for the stylus to follow relatively large excursions of said profile without sacrificing adaptability to a variety of operating conditions. The invention may be used for measuring the profile or for providing data for copying the profile in a profile-copying system.
BRIEF DESCRIPTION OF THE DRAWINGS
An example of apparatus according to this invention will now be described with reference to the accompanying drawings wherein:
FIG. 1 is an elevation of a co-ordinate measuring machine including a stylus mounting.
FIG. 2 is a section on the line II--II in FIG. 1.
FIG. 3 is a section on the line III--III in FIG. 1 and shows details of the stylus mounting.
FIG. 4 is a diagram of the overall operating system of the machine shown in FIG. 1 and shows a computer, motors and feedback transducers of this system.
FIG. 5 is a detail of FIG. 4 and shows a diagram of control systems for motors contained in the stylus mounting.
FIGS. 6a and 6b are a flow diagram for operation of the computer shown in FIG. 4.
FIG. 7 is a detail of FIG. 1 and illustrates a modified mode of operating the stylus mounting.
FIG. 8 is a plan view of FIG. 7.
FIG. 9 shows a modification of the control systems shown in FIG. 5.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 1 and 2, a co-ordinate measuring machine CMM comprises an operating member 10 supported on a table 11 for translatory movement in the three directions X,Y,Z of the orthogonal co-ordinate system. The member 10 is drivable in the directions X,Y,Z by respective motors MX,MY,MZ in a manner known per se. The operating member 10 has secured thereto a probe head PH comprising (FIG. 3) a base or housing 20 supporting a shaft 22 rotatable by a motor M1 relative to the housing 20 about an axis A1. The shaft 22 is secured to a member or further housing 23 supporting a shaft 24 rotatable by a motor M2 relative to the housing 23 about an axis A2 perpendicular to the axis A1. The shafts 22,24 are supported for rotation in respective bearings 22A,24A in the respective housings 20,23. The shaft 24 has secured thereto a frame or stylus holder 25 to which is secured a stylus 26 having an axis A3 perpendicular to the axis A2. The stylus 26 has a free end defined by a spherical sensing element 27 and a supported end defined essentially by the axis A2. The axes A1,A2,A3 preferably have a common point of intersection 28 (FIGS. 1,2).
The arrangement is such that the motors M1,M2 can position the sensing element 27 angularly about the axes A1 or A2, and the motors MX,MY,MZ can position the head PH or, more specifically, the point 28 linearly anywhere within the operating field of the machine CMM. Linear position transducers TX,TY,TZ are provided for measuring linear displacement LX,LY,LZ of the member 10 in the respective directions X,Y,Z. Angular position transducers T1,T2 are provided for measuring angular displacements W1,W2, of the stylus 26 about the respective axes A1,A2, i.e. relative to the member 10. The motors MX,MY,MZ,M1,M2 are also collectively referred to by the letter M, and the transducers are collectively referred to by the letter T.
A computer 50 (FIG. 4) is programmed to output drive signals 32X, 32Y, 32Z, 32Z, 322, collectively denoted 32 for driving the respective motors M thereby to position the sensing element
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Renishaw plc
Ruggiero Joseph
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