Abstract:
The spacing distance D between a scale and a scanner element of a scanner unit is adjusted simply through the use of a positioning element which is part of the scanning unit. The scanner unit has a mounting element on which the scanner element is supported. The scanner element is displaceable perpendicularly to a surface of the scale from a first reference position to a second reference position. A screw is used to actuate for the displacement and the reference positions are predetermined by stop faces of the screw and stop faces of the mounting element.
Abstract:
A calibration method of determining and compensating differences of measuring forces in different coordinate directions in a measuring scanning system for use in a numerically controlled multi-coordinate measuring machine, which method includes the steps of inputting parameters of the scanning system and of a calibration gauge into a control unit of the multi-coordinate measuring machine, scanning calibrating surfaces of the calibrating gauge with the scanning system, with a scanning displacement being effected in a direction defined by two coordinate directions, superimposing on the initial scanning displacement another scanning displacement, which deviates from the initial displacement, and determining deviation displacement paths of the scanning system for determining differences of the measuring force in different coordinate directions and respective correction coefficients, which are inputted into the control unit of the coordinate measuring machine.
Abstract:
A multi-coordinate probe with a stylus is disclosed wherein the stylus has a mounting or seating location defining its zero position. The stylus is deflectable from the zero position in several coordinate directions and is urged by a restoring force back into its zero position. The mounting location of the stylus is formed by the cooperation of surface areas of a plurality of balls with associated surface areas of support members. The balls and the support members are centrally arranged about the axis of the probe. The balls are fixedly mounted on a mounting member while the support members, which preferably are in the form of cylinder bodies with a V-shaped groove in the surface facing the balls, are, during assembly of the probe, rotatable about their own axis and axially movable to accomplish the desired precision seating of the ball surfaces in the grooves. After the positioning is accomplished, the cylindrical bodies are immovably fixed within the probe casing. A method is also disclosed to facilitate the precision seating of the balls in the grooves during assembly of the probe.
Abstract:
An angle encoder including a carrier member, a measurement tape securable on the bearing surface circumference of the carrier member by being clamped thereto and having its opposite ends engaging opposite stop surfaces provided on the bearing surface in a mounted position of the measurement tape, and an adjustment element for adjusting a position of at least one of the stop surface so that a distance between the two stop surfaces and thereby a length of the bearing surface circumference correspond to a length of the measurement tape.
Abstract:
A positional encoder assembly including a positional encoder, an interface unit releasably connectable with the positional encoder for connecting the positional encoder with a data bus, and connection elements providing for connection of the interface unit with the positional encoder and for disconnection of the interface unit therefrom upon displacement of the interface unit relative to the positional encoder.
Abstract:
An angular encoder including a flexible measurement tape having a graduation and secured to a sector of a convex or concave, as the case may be, circumferential surface of a support, a scanning head for scanning the graduation of the measurement tape and two tensioning or pressure devices provided at opposite ends of the measurement tape, dependent on whether the measurement tape abuts a convex or concave circumferential surface, respectively, which apply to the two ends of the measurement tape equal tensioning or pressure forces acting in opposite directions, respectively.
Abstract:
A multi-coordinate touch probe including a deflectable stylus, a stylus support, and a sensor arrangement for sensing the deflection of the stylus and for generating a deflection signal, with the deformation parameters of the assembly stylus/support, which include a geometrical layout of the support, a geometrical shape of the stylus, and properties of a stylus material, being so selected that a noticeable scanning direction-dependent characteristic is eliminated.
Abstract:
A multi-turn rotary encoder that includes a first code carrier connected with an input shaft, a scanning device that scans the first code carrier and generates an absolute position of the input shaft within one revolution, and a digital code word is present at an output of the scanning device and a second code carrier for measuring the number of revolutions of the input shaft. A reduction gear is arranged between and coupled to the first and second code carriers. The second code carrier includes a magnetic body with at least one north and south pole and a substrate with a spatial arrangement of sensor elements integrated therein, which are sensitive to magnetic fields, is associated with the magnetic body. An evaluation circuit integrated into the substrate, wherein scanning signals, which are phase-shifted with respect to each other, from the sensor elements are supplied, and that the evaluation circuit combines the scanning signals in such a way that a second digital code word is present serially or in parallel at an output of the evaluation circuit. A combination logical device, which is supplied with the first and second digital code words and which forms a resultant multi-digit code word therefrom.
Abstract:
A position measuring instrument comprising a graduation unit and a scanning unit. The graduation unit comprises a centering flange, a graduation carrier and a measuring graduation located on the graduation carrier. The scanning unit comprises a scanning component which comprises a scanning graduation and a stop. During assembly, the scanning unit is positioned radially with respect to the graduation carrier by positioning the stop against the centering flange. The scanning component may then be moved along a guide towards the measuring graduation. As the scanning component is moved towards the measuring graduation the stop no longer contacts the centering flange. A spacing foil removably sandwiched between the measuring graduation and the scanning graduation is used to position the scanning graduation at a predetermined distance from the measuring graduation. A locking means is then used to prevent further movement of the scanning component along the guide.
Abstract:
A multicoordinate sensing head is disclosed which incorporates a particularly simple mechanical structure to mount the sensing pin in a casing such that the pin is movable in a plurality of directions. Each deflection of the free end of the sensing pin is converted by appropriately shaped components on the sensing pin and the casing into an axial movement of a radially constrained upper end of the sensing pin. The slight axial movements of the upper end of the sensing pin brought about by deflections of the free end of the sensing pin are registered by a photoelectric arrangement arranged in the region of the upper end of the sensing pin. This photoelectric arrangement generates a signal when the free end of the sensing pin is deflected.