EP1733184A1 - Tastkopf mit schutzvorrichtung und koordinatenmessgerät mit solchem tastkopf - Google Patents
Tastkopf mit schutzvorrichtung und koordinatenmessgerät mit solchem tastkopfInfo
- Publication number
- EP1733184A1 EP1733184A1 EP05733653A EP05733653A EP1733184A1 EP 1733184 A1 EP1733184 A1 EP 1733184A1 EP 05733653 A EP05733653 A EP 05733653A EP 05733653 A EP05733653 A EP 05733653A EP 1733184 A1 EP1733184 A1 EP 1733184A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- probe
- stylus
- holder
- collision
- collision protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000001681 protective effect Effects 0.000 title description 4
- 239000000523 sample Substances 0.000 claims description 203
- 241001422033 Thestylus Species 0.000 claims description 111
- 238000000926 separation method Methods 0.000 abstract 2
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 229910001750 ruby Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/047—Accessories, e.g. for positioning, for tool-setting, for measuring probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/004—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points
- G01B5/008—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points using coordinate measuring machines
- G01B5/012—Contact-making feeler heads therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/004—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points
- G01B7/008—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points using coordinate measuring machines
- G01B7/012—Contact-making feeler heads therefor
Definitions
- the invention relates to a probe for a coordinate measuring machine and a coordinate measuring machine with such a probe.
- the invention relates to a probe for use on a coordinate measuring machine.
- the probe is designed to guide one or more styli at the same time in order to probe one- or multi-dimensional objects.
- the probe has a device for measuring a deflection of a flexible probe part.
- the probe has a probe carrier with which it can be attached to a quill of a coordinate measuring machine.
- this is attached to a workpiece holder of the coordinate measuring device, and the probe is displaced relative to the workpiece holder by the coordinate measuring device until a probe tip of a stylus of the probe comes into contact with the workpiece.
- the coming into contact leads to a deflection of the stylus relative to the probe head and is registered by a sensor of the probe head.
- the coordinates of the probe tip are then determined via sensors of the coordinate measuring device, from which coordinates of the probed location of the surface of the workpiece can be determined. This process can then be repeated for other locations on the surface of the workpiece.
- the probe for the coordinate measuring machine comprises a probe carrier which can be attached to the coordinate measuring machine, a stylus holder which can be deflected relative to the probe carrier from a rest position for receiving a stylus, a sensor system with a sensor for detecting a deflection of the stylus holder relative to the probe carrier, a stylus with a stylus base and at least one stylus, the stylus base being attached to and extending from the stylus receptacle, and a collision protection device which can be deflected together with the stylus holder relative to the probe head, parts of the collision protection device, seen in projection in the direction of extension of the stylus base is arranged outside the sensor system at at least three locations distributed in the circumferential direction around the stylus base.
- a collision protection device that can be deflected together with the stylus is thus provided, which has the at least three locations that protrude laterally, for example, beyond the sensor system and are arranged such that unintentional contact with an object does not occur with the sensor system but with one of the locations of the collision protection - Direction arises.
- This then unexpected touch signal from the sensor can be interpreted as a collision of the probe with an object by the control system of the coordinate measuring machine.
- the control system of the coordinate measuring machine can then stop the further movement of the probe relative to the workpiece holder and trigger an alarm signal.
- a user can then check the proper functioning of the measurement process.
- a probe for a coordinate measuring machine comprises a probe carrier that can be attached to the coordinate measuring machine, a stylus holder for recording a stylus at a rest position, a sensor for detecting a deflection of the stylus holder relative to the probe carrier, and a collision contact at at least one contact position that lies in a plane that is orthogonal to a straight line that extends between the probe carrier and the stylus holder in its rest position is, a maximum distance of the plane from the probe holder corresponds to the distance of the stylus holder from the probe holder and the contact position with respect to the straight line is arranged outside the sensor, and wherein the collision contact with the stylus holder can be deflected together relative to the probe holder.
- the stylus holder is arranged in the plane.
- the collision contact is thus arranged in the plane with the stylus holder.
- the collision contact preferably even engages under the plane somewhat, so that collision protection, for example, even when the. Probe is effective.
- This embodiment is advantageous if, for example, a stylus is inserted in the stylus holder of the probe and / or is held by the stylus holder in order to measure a chamber of a workpiece.
- the collision contact which is arranged in an area of the probe head which is assigned to the stylus holder and is located somewhat below the plane with the stylus holder, can contact an outer wall the chamber of the workpiece, and trigger a reaction of the coordinate measuring device, which protects the probe against damage by excessive lowering of the probe against the workpiece.
- the collision contact is designed as a post, rod, rod or strut which extends upwards.
- the post extends upwards from the level with the stylus holder, that is to say an area assigned to the stylus holder, which can also lie somewhat below the plane.
- a certain protection of the probe against collisions is achieved with minimal use of material.
- the sensitivity of the stylus holder of the collision-protected probe head is thus maximized, since the inertia of the stylus holder is minimal.
- the collision contact has an annular strut which is placed around the posts and connected to the posts.
- the ring strut enables all-round protection of the probe head with a particularly small amount of material.
- the sensitivity of the stylus holder of the collision-protected probe head is particularly great, since the inertia of the stylus holder is particularly low.
- the collision contact has an elastic free end.
- the elastic free end intercepts a part of the impact in the event of a collision, so that damage to the sensitive sensor of the probe is avoided even if the movement of the probe against a collision object is more violent than a permissible movement of the stylus holder relative to the probe carrier. Because the elastic free end of the collision contact deforms and yields to the collision object, the impact movement which the stylus holder experiences against the probe carrier is not so violent that the probe is damaged.
- the collision contact is designed as a cage, which at least partially surrounds the sensor.
- the collision contact is designed as a cup which at least partially surrounds the sensor.
- one is special Extensive protection of the probe is possible because, especially in the case of a complete encapsulation of the probe by means of the cage-shaped or cup-shaped collision contact, the collision of the probe with an object is a collision of the collision contact, which leads to a movement of the stylus holder relative to the stylus carrier and thus from the sensor is detected, which enables a reaction of the coordinate measuring machine.
- the collision contact is designed as a housing.
- the housing surrounds the sensor, for example, in such a way that an inner wall of the housing is arranged at a distance from the sensor when the stylus receptacle is not deflected, but is at its rest position.
- the distance of the inner wall from the sensor ensures freedom of movement of the sensor, that is to say a sensor device, sensor mechanism, sensor system or sensor arrangement of the probe, and in particular the stylus holder of the probe.
- the distance between the inner wall and the sensor preferably corresponds to at least one maximum deflection of the stylus holder from the rest position. In this embodiment, the freedom of movement of the stylus holder is particularly large.
- the stylus receptacle and the collision contact are formed in one piece.
- This embodiment enables a particularly cost-effective implementation of the probe according to the invention, because the probe pin recording is, so to speak, integrated into the collision contact, which is designed, for example, as a housing that largely surrounds the sensor of the probe.
- the probe is particularly low-maintenance and can be loaded because the number of individual parts required to assemble the probe is particularly low.
- the probe comprises an inner housing.
- the inner housing is rigidly connected to the probe carrier, for example.
- the collision Contact arranged outside the inner housing.
- the collision contact is arranged at a distance from the inner housing such that the smallest distance of the collision contact from the inner housing at the rest position of the stylus holder corresponds at least to the maximum deflection of the stylus holder from the rest position. This ensures freedom of movement of the stylus holder relative to the probe carrier with the inner housing of the probe.
- the collision contact is releasably attached to the stylus receptacle.
- the probe is particularly easy to maintain.
- the collision contact can be released from the stylus holder and removed from the probe, so that, for example, the sensor of the probe is exposed.
- it is then possible to check the reliability of the sensor for example by measuring the deflection of the stylus holder from the rest position.
- the collision contact which can be releasably attached to the probe head, in particular to the probe pin receptacle of the probe head or to a probe pin received by the probe pin receptacle, can be designed as a retrofit contact to provide a conventional probe head with the collision protection according to the invention.
- the collision contact preferably has an attachment or similar connecting means in order to enable the collision contact to be detachably fastened to the probe, which can be a conventional probe.
- the collision contact can be plugged onto the probe head according to the invention.
- the invention includes a collision protection device for use on a probe of a coordinate measuring machine.
- the collision protection device preferably comprises an attachment attachment for attaching the collision contact to a probe holder or to a stylus for a coordinate measuring machine.
- the attachment projection is designed such that the collision protection device is attached to a conventional probe is possible.
- the collision protection device comprises a collision contact, which preferably extends away from the attachment attachment. For example, the collision contact extends upward from the attachment boss.
- the collision protection device is preferably designed such that it can be plugged onto the stylus holder of the probe. In this embodiment, for example, a conventional probe can be retrofitted with the collision protection device in order to implement the probe according to the invention.
- the collision contact device in particular the attachment attachment, has a latching device which is set up for latching with a counter-latching device arranged on the stylus holder. This enables a particularly simple “snap-on” connection of the collision device according to the invention with the probe, in particular the stylus holder and / or a stylus.
- the collision contact is formed with one or more styli.
- the collision contact is provided for use with the probe, in particular the conventional probe, instead of a conventional stylus, in order to implement the probe according to the invention with the stylus.
- the collision protection is formed in one piece with the stylus.
- the collision contact extends, for example, as seen from a key end of the stylus, beyond an attachment attachment for receiving the stylus in a stylus holder of a probe for a coordinate measuring machine and away from the key end.
- the invention includes a use of the collision protection device according to the invention in a probe.
- the collision protection device is or is attached, for example, to the probe holder.
- the invention comprises a probe, in particular a probe according to the invention, for a coordinate measuring machine, comprising: a probe holder which can be attached to the coordinate measuring machine, a stylus holder which can be deflected from a zero position relative to the probe holder and to which a stylus for probing a workpiece can be attached, a sensor for sensing a deflection of the stylus holder relative to the probe carrier from the zero position, and a stylus with a first end attached to the stylus holder, one extending from the stylus holder.
- a collision protection which can be deflected together with the stylus holder relative to the probe head carrier and which has an outer region which extends in projection onto an orthogonal to a longitudinal axis of the shaft seen first level is arranged outside all components of the sensor, the outer region being arranged in a projection of a plane with the longitudinal axis of the shaft in a region of the stylus holder.
- the invention further comprises a coordinate measuring device for taking measurements of coordinates on workpieces or similar geometric measurements, comprising: a base with a stand-up device and a workpiece holder for receiving a workpiece to be measured, struts which extend upward from the base, guides , which are mounted on the struts, and a measuring device which can be moved on the guides in a controllable manner, the measuring device having a probe according to one of the preceding claims.
- the coordinate measuring device has a control device which is set up to control a movement of the measuring device in such a way that a braking distance for stopping the movement does not substantially exceed a maximum deflection of the stylus holder.
- the invention further comprises a method for controlling a coordinate measuring machine, in particular a coordinate measuring machine according to the invention, with the steps: deriving a probe state signal from a signal of the sensor element; Entering the probe status signal to the controller; Processing the probe status signal to determine if the probe collides with an obstacle; and outputting a stop signal to the control device if a collision is detected.
- the invention also includes a computer program for use in a control device of a coordinate measuring device, in particular a coordinate measuring device according to the invention, the computer program preferably being set up to carry out the method according to the invention.
- FIG. 1 shows a perspective illustration of an exemplary embodiment of the coordinate measuring device according to the invention which is provided with a first exemplary embodiment of the probe head according to the invention
- Fig. 2 is a perspective view, partly in section, of the probe shown in Fig. 1;
- Fig. 3 is a perspective view, partly in section, of a second embodiment of the probe according to the invention.
- Fig. 4 is a perspective view, partly in section, of a third embodiment of the probe according to the invention.
- FIG. 5 is a perspective view, partly in section, of a fourth embodiment of the probe head according to the invention.
- Fig. 6 is a sectional view of a conventional probe having a first embodiment of the collision contact device according to the invention;
- Fig. 7 is a top plan view of the probe shown in Fig. 2 in the plane labeled -7-7-;
- Fig. 8 is a top plan view of the probe shown in Fig. 5 in the plane labeled -8-8-;
- FIG. 9 is a perspective view of a conventional probe having a second embodiment of the collision contact device according to the invention.
- FIG. 10 is a perspective view of a conventional probe having a third embodiment of the collision contact device according to the invention.
- the coordinate measuring machine 1 comprises a base 3 with four feet 5 by means of which the coordinate measuring machine 1 stands on a surface of a measuring table (not shown in FIG. 1).
- the base 3 carries in its center a workpiece holder 7, on which a workpiece - not shown in FIG. 1 - to be measured, for example a piston or similar machine part, can be attached.
- struts 11, 12 extend upwards.
- the struts 11, 12 carry two longitudinal guides 13, 14 arranged on both sides of the workpiece holder 7, which extend parallel to one another in a horizontal y-direction.
- a transverse guide extends in a horizontal x-direction, which is perpendicular to the y-direction 15, which is mounted on the longitudinal guides 13, 14 so as to be displaceable in the y direction.
- a guide profile 17 is provided at one end of the transverse guide 15, which surrounds the longitudinal guide 14 from above in a U-shape and on which a plurality of air cushions 19 are provided, by means of which the transverse guide 15 is supported on the longitudinal guide 14.
- the other end of the transverse guide 15 is supported on the upper side of the longitudinal guide 13 by means of a further air cushion 20.
- the transverse guide 15 is also slidably supported in the y direction with respect to the longitudinal guide 13.
- the transverse guide 15 can be displaced along the longitudinal guide 14 by means of a motor drive (not shown).
- a displacement position is read off on a scale 23 fixed on the base 3 and an associated sensor 21 fixed on the U-profile 17.
- a vertical guide 27 is mounted displaceably in the x direction via a guide profile 25.
- the displacement position of the vertical guide 27 is again read via a scale 29 attached to the transverse guide 15 and a sensor 31 attached to the profile 25.
- the guide profile 25 there are two further guide profiles 30 which are arranged at a distance from one another and which slidably support a rod 32 extending in the vertical direction (z direction) by means of a motor 33.
- the displacement position of the rod 32 in the z direction is detected by means of a sensor 34 provided on the rod 32, which reads the position on a scale 35 provided on the vertical guide 27.
- a probe 36 is attached to a lower end of the rod 31.
- the probe has a stylus holder 77 which holds a shaft 79 of a stylus 37.
- the stylus 37 has at its free end a plurality of stylus tips for probing a workpiece that can be attached to the workpiece holder 7.
- the coordinate measuring machine 1 has a control unit (not shown) which receives signals output by the sensors 21, 31, 34 and sends them to the motor drives such as the Motor 33 outputs control signals.
- a user can control the coordinate measuring machine directly by means of the control unit, for example for teaching a measuring process, or automatically, for example for carrying out a learned measuring process.
- the probe 36 comprises an essentially cylindrical housing or chassis 39, a jacket 41, an upper cover 43 and a lower cover 45 (FIG. 2). Opposing edge sections of the casing 41 are fastened to the upper cover 43 or to the lower cover 45, so that the lower cover 45 is rigidly connected to the upper cover 43 by means of the casing 41.
- a sensor mechanism Arranged in the interior of the housing 39 is a sensor mechanism which contains a ring 47 to which a radially outer end 49 of a spiral spring 51 is fastened.
- the spiral spring 51 extends in a horizontal plane (x-y) with a plurality of turns around a longitudinal axis 53 of a stylus holder 55 radially inwards.
- the spiral spring 51 with its end 57 arranged radially on the inside, is fastened to an area 56 of the stylus holder 55 which is central along the longitudinal axis 53.
- the spiral spring 51 holds the stylus holder 55 in a zero position with respect to the chassis 39.
- the spiral spring 51 provides a spring force which forces the stylus holder 55 back into the zero position when the central region 56 of the stylus holder 55 is deflected under the action of corresponding restoring forces acting in the z direction, x direction and y direction.
- a rod 54 extends upwards from the central region 56 of the stylus holder 55, at the upper end 58 of which an angle part 59 is clamped by means of a screw 61.
- the angular part 59 extends from the upper end of the rod 54 against the x-direction first to the housing shell 41 and then, without touching the chassis 39, in the z-direction upwards.
- a leaf spring 65 is clamped with its one end 66 in such a way by means of a block 63 and screws 64 that it starts from the upper end of the angle part 59 in the x direction back to the longitudinal axis 53, beyond this extends to the housing shell 41.
- the leaf spring 65 With its other end 67, the leaf spring 65 is clamped in a holder 69 which is fixed to the jacket 41 of the housing 39.
- the holder 69 has a lower part 71 fastened to the jacket and an upper part 74 pressed against the lower part 71 by means of screws 73, the spring end 67 being clamped between the lower part 71 and the upper part 74.
- a deflection measuring system 80 is arranged on the chassis 39 below the spiral spring 51.
- the deflection measurement system 80 has a set 82 of three distance sensors.
- the distance sensors jointly include a transmitter coil 86, which is mounted on the stylus holder 55, and a receiver coil 84, which is mounted on the lower cover 45.
- the transmitter coil 86 emits an electromagnetic field, the field of which is received by the receiver coils 84.
- the field strength of the field of the transmitter coil 86 at the location of the receiver coil 84 depends in each case on the distance of the transmitter coil 86 from the receiver coil 84.
- the receiver coil 84 outputs a corresponding distance signal.
- the deflection system thus detects a position of the transmitter coil 86 with respect to the receiver coils 84.
- the stylus holder 77 is formed at a lower end of the stylus holder 55.
- the shaft 79 of the stylus 37 is screwed into the stylus holder 77 such that the longitudinal axis of the shaft 79 is aligned with the longitudinal axis 53 of the stylus holder 55.
- Attached to a lower end of the shaft 79 are five branch shafts 81 which extend in the directions -z, + x, -x, + y and -y from the lower end of the shaft 79.
- Each branch 81 carries at its free end a ruby ball 83 which forms the tip of the stylus and is provided for contact with the workpiece to be measured.
- a collision contact designed as a collision protection cup 90 is fastened to the stylus holder 77 (FIG.
- the collision protection cup 90 is cylindrical, its cylinder axis being aligned with the longitudinal axis 53 of the shaft 55.
- the collision protection cup 90 has a cup bottom 92, in the middle of which the stylus holder 77 is embedded.
- the cup bottom 92 extends essentially in a horizontal plane (xy) radially away from the stylus receptacle 77 to a bottom edge 94.
- the outline of the bottom edge 94 projects beyond the outline of a projection of the chassis 39 with the sensor system of the probe head 36 the longitudinal axis 53 to the horizontal plane (xy).
- a lower end 96 of a cup wall 98 of the collision protection cup 90 is formed on the bottom edge 94 of the cup bottom 92.
- the cup wall 98 extends from the plane (xy) with the cup bottom 92 approximately at a right angle upwards to a horizontal plane (xy) with the cover 43 of the chassis 39.
- a free cup edge 100 of the collision protection cup 90 is thus at the same level of the lid 43 arranged.
- a distance 99 between the inside of the cup wall 98 and the probe 36 is greater than a maximum deflection of the probe 36 from the zero position.
- the chassis 39 of the probe head 36 instead of the housing shell 41 according to the first exemplary embodiment — has a plurality of vertical struts 141.
- the vertical struts 141 run vertically on a cylindrical surface of the cylindrical housing 39. Opposing free ends of the vertical struts 141 are fastened to the upper cover 43 or to the lower cover 45, so that the lower cover 45 is connected to the upper cover 43 by means of the vertical struts 141 is rigidly connected.
- the collision protection cup 90 which corresponds exactly to the collision protection cup 90 of the first exemplary embodiment, is fastened to the stylus holder 77, for which reason a description can be dispensed with.
- the weight of the probe 36 is lower than in the first exemplary embodiment, because the total weight of the Vertical struts 141 is less than the weight of the housing shell 41.
- the collision protection cup 90 in particular the deflection measuring system 80 with the sensor mechanism, preferably protects like the housing shell 41 in the first exemplary embodiment.
- a third exemplary embodiment differs from the first exemplary embodiment in that in the third exemplary embodiment the collision contact comprises a plurality of approximately L-shaped collision protection rods 190 which are fastened to the stylus holder 77.
- a horizontal bar 192 of the L-shaped collision protection rods 190 is in each case attached to the stylus holder 77 in such a way that. that the horizontal bar 192 extends radially away from the stylus holder 77 in a substantially horizontal plane (x-y).
- An end 194 of the horizontal bar 192 remote from the stylus receptacle 77 projects beyond the outline of a projection of the chassis 39 with the sensor system of the probe head 36 onto the horizontal plane (x-y).
- a lower end 196 of a vertical bar 198 of the L-shaped collision protection rod 190 is formed on the distal end 194 of the horizontal bar 192.
- the vertical bar 198 extends from the plane (x-y) with the horizontal bar 192 approximately at a right angle upwards to the level with the cover 43 of the chassis 39.
- a free end 110 of each collision protection rod 190 is thus arranged approximately at the height of the cover 43.
- a distance 199 between the inside of the vertical bar 198 facing the probe 136 and the probe 136 is greater than a maximum deflectability of the probe 136 from the predetermined zero position.
- the L-shaped collision protection bars 190 are connected to one another by means of at least one horizontal ring which surrounds the entirety of the collision protection bars 190.
- a light film for example made of plastic, surrounds the entirety of the collision protection rods 190.
- the collision rods 190 are designed to be resilient, in particular at their free ends.
- the collision rods 190 are merely designed as horizontal bars 192, the free ends 194, for example, each having a spring element.
- the vertical bars 196 of the collision rods 190 do not extend to the height of the cover 43, but only up to approximately half the height.
- the vertical bars 196 of the collision rods 190 not only extend above the horizontal bars, but also below, in particular if the horizontal bars are arranged above the plane with the stylus holder.
- an elongated probe head 236 has a probe head carrier designed as a chassis 239.
- the chassis 239 comprises a part 201, 202 which is fixed to the housing and is provided, for example, for fastening to the coordinate measuring machine 1.
- the housing-fixed part 201, 202 is designed as an angle, a first leg 201 being arranged horizontally at the top and having a receiving swallow for fastening the probe head 236 to a quill (not shown) of the coordinate measuring machine 1.
- a second leg 202 extends vertically downward from the first leg 201.
- the probe 236 comprises a further angle 203, 204, which is connected by means of a pair of spaced spring plates 205, 206 to the second leg 202 of the part of the probe 236 fixed to the housing.
- This arrangement forms a z-guide of the probe head 236.
- the probe head 236 has a plate 209 which is movably suspended on a horizontal leg 204 of the z-guide by means of a second pair of spring plates 207, 208 (spring plate 208 not shown) and one y- guidance of the probe 236 forms.
- the probe 236 also has a third pair of spring plates 211, 212, which hangs on the plate 209 and is rotated at a right angle in a horizontal plane with respect to the spring plates 207, 208 and connects the plate 209 to a further plate 210 of the probe 236 , which forms an x-guide of the probe 236.
- the plate 210 has a stylus holder (not shown) on an underside.
- the stylus receptacle is designed as a socket which extends downward from the underside of the plate 210, a longitudinal axis of the socket being aligned with the longitudinal axis 253 of the probe head 236.
- a stylus 213 is screwed into the stylus receptacle.
- the stylus 213 has a stylus ball 214.
- Each of the three parallel guides is provided with a measuring force generator in the manner of a moving coil drive.
- a first magnet 215 is attached to the fixed part 202, a second magnet 216 to an underside of the leg 204 and a third magnet 217 of the moving coil drive to the plate 209, while the moving parts, that is to say the coil bodies of the moving coil drives, are attached the deflectable parts 203, 209, 210 of the z, y or x guide are connected.
- the probe 236 also has three measuring systems 221, 222, 223 (measuring system 222 not shown), by means of which a deflection of the guided parts of the probe 236 in the three coordinate directions x, y, z can be determined.
- the measuring systems are designed, for example, as LVDT systems, that is to say as induction coils which are operated at a carrier frequency and which emit a path signal which is proportional to a position of a displaceably mounted coil core.
- a collision protection housing 290 is fastened to the stylus holder (FIG. 5, FIG. 8).
- the collision protection housing 290 is designed as an elongated box which is arranged upright and whose horizontal cross section is square.
- a longitudinal axis of the collision protection housing 290 is aligned with the longitudinal axis 253 of the shaft 213.
- the box-shaped collision protection housing 290 has a box bottom 292 and a box wall 298.
- the stylus receptacle is embedded in the middle of the box bottom 292. 'The bottom of the box 292 extends substantially in a horizontal plane (xy) of the stylus retainer away up to a bottom edge 294.
- a lower end 296 of the box wall 298 of the collision protection housing 290 is formed on the bottom edge 294 of the box bottom 292.
- the box wall 298 extends from the plane (xy) with the box bottom 292 approximately at right angles upwards to a plane (xy) with the first part 201 of the chassis 239 fixed to the housing.
- a free box edge 200 of the collision protection housing 290 is thus at the level of the arranged first housing-fixed part 201.
- a distance 299 on the inside of the box wall 298 from the chassis 239 or the measuring system of the probe 236 is greater than a maximum deflection of the measuring system of the probe 236 from its zero position.
- a collision protection attachment 390 is plugged onto a conventional probe head 336 (FIG. 6).
- the probe 336 is elongated and arranged upright on the coordinate measuring machine 1.
- the probe 336 has a chassis 339.
- An upper end of the probe head 336 is attached to a quill 355 of the coordinate measuring machine 1 such that the longitudinal axis 356 of the probe head 336 is aligned with a longitudinal axis of the quill 355.
- a lower end of the probe 336 is movable relative to the upper end attached to the quill 355.
- the lower end of the probe head 336 has a stylus holder 377 into which a stylus (not shown) can be inserted.
- An upper section 378 of the stylus receptacle 377 is plate-shaped, a horizontally circumferential groove 380 being formed in a side wall 379 of the upper section 378.
- the collision attachment 390 is designed as an elongated hood which has a hood base 392 and a hood wall 398.
- the hood base 392 has a central opening, the diameter of which essentially corresponds to the diameter of the upper section 378 of the stylus receptacle 377 at the level of the groove base of the groove 380.
- the hood bottom 392 extends from a bottom inside edge 393, which delimits the central opening, away from a bottom outside edge 394.
- the outline of the bottom outside edge 394 projects beyond the outline of a projection of the probe head 336 onto a horizontal plane (xy). In the area of the inner edge 393 of the hood 392 is somewhat flexible.
- the hood base 392 can be plugged with the central opening onto the section 378 of the stylus receptacle 377, and the bottom inner edge 393 can be brought into engagement with the groove 380. Possible materials of the hood base 392 include plastic or sheet metal.
- a lower end 396 of the hood wall 398 of the collision protection hood 390 is formed on the outer edge 394 of the hood base 392.
- the hood wall 398 extends from the level (xy) with the hood base 392 approximately at right angles up to beyond the level (xy) in which the chassis 339 on the Pinole 355 is attached.
- a free hood edge 300 of the collision protection hood 390 is thus arranged above the chassis 339, so that the collision protection hood 390 essentially completely surrounds the probe head 336.
- a distance 399 between the inside of the hood wall 398 and the probe 336 is greater than the maximum deflection of the probe 336 from a predetermined zero position.
- an annular membrane is stretched from the hood edge 300 to the sleeve 355, so that the probe head 336 is completely enclosed in the interior of the collision protection hood 390, in particular adequately protected from contamination during operation of the coordinate measuring machine.
- the collision protection contact device is again designed as a collision protection attachment 490, which can be plugged onto a conventional probe head 336, in particular onto a stylus holder of the probe head 336 (FIG. 9).
- the stylus holder holds a stylus 313 with a stylus ball 314.
- the collision protection attachment 490 is designed in the manner of a spoke wheel, in which four spokes 492 extend radially outward in a substantially horizontal plane from a hub (not shown).
- the hub is designed to engage in a groove on a side wall of the stylus holder.
- the spokes 492 At the ends 494 opposite the hub, the spokes 492 have radial spring elements 495, the free ends of which are connected to one another by means of a ring bracket 400.
- the collision contact in particular the ring bracket 400, runs outside the outline of the probe head 436.
- the ends of the spokes 492 are arranged in pairs with respect to the stylus holder at an angle of 90 ° to one another.
- the collision contact is again designed as a collision protection attachment 590, which can be plugged onto a conventional probe head 336, in particular onto a stylus holder of the probe head 336 (FIG. 10).
- the stylus holder holds a stylus 313 with a probe ball 314.
- the collision protection attachment 590 is designed in the manner of a fork basket, in which eight spokes 592 extend like a fork, initially in a substantially horizontal plane from a scar (not shown) radially outwards and then essentially vertically upwards. The scar is designed to engage in a groove on a side wall of the stylus holder.
- the free ends 500 of the spokes 592 end approximately at half the height of the probe head 336.
- An inner contour of the respective collision protection device (collision protection cup 90, collision protection rods 190, collision protection housing 290, collision protection hood 390) is designed such that with maximum deflection of the probe kinematics, that is to say the sensor mechanism, the collision protection does not come into contact with the chassis 39, 139, 239 , 339 takes place.
- An object to be measured that is to say a workpiece
- the drive unit of the coordinate measuring machine for example the motor 33
- the drive unit of the coordinate measuring machine is controlled in such a way that the stylus 37 held on the probe head 36 moves to the points of the object to be measured to be probed.
- a traversing mode which is used, for example, to program the control unit of the coordinate measuring machine 1, the positions to be probed are determined by the user and the user issues commands to the control unit and thus controls the traversing movement directly.
- the protective device 90 contacts the object in a collision.
- the object exerts a force on the collision Protective device 90, which is opposite to the movement of the probe 36 with the protective device 90.
- The. Guard 90 moves relative to the portion of probe 36 attached to coordinate measuring machine 1.
- the sensor device of the probe 36 triggers a movement signal which is fed to the control unit of the coordinate measuring machine 1.
- the control unit outputs a stop signal to the drive unit of the coordinate measuring machine 1, and the movement of the probe head 36 is stopped.
- the length of the braking distance is advantageously shorter than the distance 99 between the inside of the collision contact 90 and the chassis 39 with the sensor mechanism or the sensor system. Damage to the probe head 36 during the collision is thus avoided.
- control unit uses the triggered movement signal to detect the relative movement direction between the probe head and the object and outputs a corresponding counter-movement control signal to the drive unit.
- the risk of damage to the probe due to a collision with the obstacle is particularly low because the probe is moved away from the obstacle immediately after a first contact.
- the invention relates to a probe for a coordinate measuring machine.
- the probe comprises a probe carrier which can be attached to the coordinate measuring machine, a stylus holder for receiving a stylus at a rest position, a sensor for detecting a deflection of the stylus holder relative to the probe carrier, and a collision contact at at least one contact position which lies in a plane which is orthogonal to a straight line extending between the probe carrier and the stylus holder in its rest position is arranged, a maximum distance of the plane from the probe carrier corresponding to the distance of the stylus holder from the probe carrier and the contact position with respect to the straight line being arranged outside the sensor, and wherein the collision contact with the stylus receptacle can be deflected together relative to the probe carrier.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200410016714 DE102004016714B4 (de) | 2004-04-05 | 2004-04-05 | Tastkopf mit Schutzvorrichtung für eine Koordinatenmessmaschine |
| PCT/EP2005/003569 WO2005098355A1 (de) | 2004-04-05 | 2005-04-05 | Tastkopf mit schutzvorrichtung und koordinatenmessgerät mit solchem tastkopf |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1733184A1 true EP1733184A1 (de) | 2006-12-20 |
Family
ID=34964903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05733653A Withdrawn EP1733184A1 (de) | 2004-04-05 | 2005-04-05 | Tastkopf mit schutzvorrichtung und koordinatenmessgerät mit solchem tastkopf |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1733184A1 (de) |
| DE (1) | DE102004016714B4 (de) |
| WO (1) | WO2005098355A1 (de) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011001976B4 (de) | 2010-04-30 | 2013-07-25 | Hexagon Metrology Gmbh | Messkopf für ein Koordinatenmessgerät |
| TWI458938B (zh) | 2011-01-19 | 2014-11-01 | Renishaw Plc | 用於機械工具裝置之類比量測探針 |
| DE102011104228B4 (de) | 2011-05-13 | 2014-12-31 | Ludwig Nanopräzision GmbH | Vorrichtung zur Längenmessung und Verwendung der Vorrichtung zur Bestimmung physikalischer Eigenschaften von Messobjekten |
| DE102011079738A1 (de) * | 2011-07-25 | 2013-01-31 | Dr. Johannes Heidenhain Gmbh | Tastkopf |
| JP5946424B2 (ja) * | 2013-05-01 | 2016-07-06 | 株式会社神戸製鋼所 | タイヤ試験機 |
| DE102014208376B3 (de) * | 2014-05-05 | 2015-06-18 | Carl Zeiss Industrielle Messtechnik Gmbh | Messkopf für ein Koordinatenmessgerät |
| CN112495865A (zh) * | 2020-12-03 | 2021-03-16 | 苏州硕华自动化设备有限公司 | 一种精密测量和切割设备 |
| US12061076B2 (en) * | 2021-06-25 | 2024-08-13 | Keyence Corporation | Probe for three-dimensional coordinate measuring device, three-dimensional coordinate measuring device, three-dimensional coordinate measuring system, and three-dimensional coordinate measuring method |
| CN118746860B (zh) * | 2024-07-25 | 2025-03-04 | 东营新瑞石油科技有限责任公司 | 一种用于探测的稳定性信号探臂 |
| CN119184722B (zh) * | 2024-09-26 | 2025-11-11 | 中核粒子医疗科技有限公司 | 一种双探头spect/ct的探头防撞控制方法及相关装置 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4763417A (en) * | 1987-03-02 | 1988-08-16 | Dr. Johannes Heidenhain Gmbh | Multi-coordinate probe |
| DE69201985T2 (de) * | 1991-02-25 | 1995-08-24 | Renishaw Metrology Ltd | Kontaktprobe. |
| GB9111382D0 (en) * | 1991-05-25 | 1991-07-17 | Renishaw Metrology Ltd | Improvements in measuring probes |
| DE4201482A1 (de) * | 1991-10-18 | 1993-04-22 | Zeiss Carl Fa | Optischer tastkopf |
| DE29511272U1 (de) * | 1995-07-12 | 1995-09-21 | Carl Zeiss Jena Gmbh, 07745 Jena | Anordnung zum Schutz von beweglichen Teilen an Koordinatenmeßgeräten (KMG) |
| DE19622987C2 (de) * | 1996-06-08 | 1998-10-29 | Mycrona Ges Fuer Innovative Me | Vorrichtung eines Kollisionsschutzes für Sensoren an Koordinatenmeßgeräten |
| DE29617754U1 (de) * | 1996-10-12 | 1996-12-05 | Carl Zeiss Jena Gmbh, 07745 Jena | Havariesensor |
| DE19721015C1 (de) * | 1997-05-20 | 1999-03-04 | Klingelnberg Soehne Gmbh | Universeller Tastkopf für Verzahnungsmessungen |
| DE19749754C2 (de) * | 1997-11-11 | 2003-01-02 | Zeiss Carl | Tastkopf für ein Koordinatenmeßgerät |
| DE10122200A1 (de) * | 2001-05-08 | 2002-11-14 | Zeiss Carl | Tastkopf für ein Koordinatenmeßgerät. Koordinatenmeßgerät, Kalibrierkörper für ein Koordinatenmeßgerät und Verfahren zum Kalibrieren eines Koordinatenmeßgerätes |
| JP2003065748A (ja) * | 2001-08-29 | 2003-03-05 | Mitsutoyo Corp | 測定装置 |
-
2004
- 2004-04-05 DE DE200410016714 patent/DE102004016714B4/de not_active Expired - Fee Related
-
2005
- 2005-04-05 WO PCT/EP2005/003569 patent/WO2005098355A1/de not_active Ceased
- 2005-04-05 EP EP05733653A patent/EP1733184A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005098355A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102004016714A1 (de) | 2005-10-20 |
| DE102004016714B4 (de) | 2008-11-20 |
| WO2005098355A1 (de) | 2005-10-20 |
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