Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1991-11-20
1995-07-04
Buczinski, Stephen C.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
33286, 35613903, 3561413, G01B 1126, G01C 100
Patent
active
054305390
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the purpose indicated in the classifying clause of patent claim 1 and to an arrangement for the performance of this method.
In technology, the problem frequently arises of precisely determining the extent to which axes, denoted in the following as body axes, of adjacently disposed bodies or parts of bodies, which should be aligned parallel to each other in the ideal case, depart from the ideal state of parallelism, as it is known before the checking only that the axes are oriented at least approximately parallelly to each other. Examples of such problems are parallelism checking of co-operating rollers which are arranged beside each other and optionally also at a larger spacing, or parallelism checking of planar surface regions of a body with utilisation of the condition that a perpendicular line erected above a certain point of these surfaces is parallel to the perpendicular lines erected above any desired other points thereof and thus can be utilised as a characteristic for the position of the respective planar surface in space. Knowledge of the approximate parallelism of the body axes at the beginning of the precision measuring is obtained from, for example, a coarse preliminary alignment of the rollers or a previous preliminary orientation, possibly a preliminary treatment, of the body surfaces.
The invention is based on the task of creating a method according to the classifying clause of claim 1, which method can be performed in simple manner with low effort in auxiliary apparatus means and yet delivers highly accurate measurement results.
The foregoing problem is solved by the method steps stated in the characterising part of claim 1.
With use of the method according to the invention, it is possible in simple manner to precisely determine whether the mutual alignment of the body axes is within an acceptable deviation from the ideal state of parallelism or which corrections must be undertaken in order to improve mutual alignment to be within the permissible tolerance range.
Subclaims 2 to 9 concern preferred embodiments of the method according to claim 1.
Claim 10 has as its subject an arrangement suitable for carrying out the method according to the invention and subclaims 11 to 15 concern preferred embodiments of the arrangement according to claim 10.
The invention is explained more closely in the following by reference to the embodiment of measurement of parallelism of the centre lines of two adjacently arranged rollers.
In the drawing there is shown respectively in schematic illustration:
FIG. 1 in perspective, the two rollers with detectors arranged at their ends therearound in a common measurement plane approximately perpendicular to their centre lines, as well as a laser beam emitted from one of the detectors approximately perpendicularly to the respective centre line,
FIG. 2 the plan view of the arrangement according to FIG. 1,
FIG. 3 the arrangement according to FIG. 1, as seen from the front with viewing direction parallel to the centre lines of the rollers,
FIG. 4 a modification of the arrangement according to FIGS. 1 to 3,
FIG. 5 a perspective illustration of a single roller with a laser beam emitted therefrom with indication of measurement magnitudes which are significant for the method according to the invention and which in part result from a departure from parallelism relative to a reference axis, and
FIGS. 6 to 10 different embodiments of a device for emission of the laser beam from the shafts to be checked.
FIG. 1 shows two adjacently disposed rollers 1 and 2, the centre lines 1a and 2a of which are at least approximately parallel to each other and the mutual position of which is to be checked for parallelism or for exact extent of departure from the ideal state of a desired parallel alignment. For this check, a laser beam transmitter 3 is so detachably fastenable by means of a suitable attachment device, for example one of the attachment devices 11a to 11e illustrated in FIGS. 6 to 10, to each roller 1 and 2 that it emits the laser beam L, which
REFERENCES:
patent: 3603691 (1971-09-01), Hamilton
patent: 3923402 (1975-12-01), Turcotte
patent: 4209254 (1980-06-01), Reymond et al.
patent: 4298281 (1981-11-01), Schave
patent: 4701018 (1987-10-01), Loucks
Buczinski Stephen C.
Pruftechnik Dieter Busch AG
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