Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1999-04-01
2000-10-31
Pham, Hoa Q.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
356287, G01B 1108
Patent
active
06141106&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A known measuring instrument of this kind (DE 42 24 253 C1) devised for measuring cylinders of printing presses comprises a carriage which is arranged below and parallel to a bridge of a crane assembly which bridge moves on two rails. Two guide members protrude downwardly from the bridge, and the carriage is guided on them so as to be movable in vertical direction. A distance measuring means which measures the vertical movements of the carriage is arranged outside of the space between the two guide members. The carriage constitutes a transverse beam on which a retaining fixture is movable parallel to the bridge, in other words horizontally. The retaining fixture supports a dual limb bracket in such a way that the latter can be swung back and forth between operative and inoperative positions. When in operative position, the two limbs of the bracket extend vertically downwards so that the bracket forms an inverted U which is open at the bottom. In the inoperative position, the limbs of the bracket extend horizontally and parallel to the transverse base of the bracket. Transmitter and receiver elements, respectively, of a light barrier are arranged at the ends of the two limbs of the bracket. The spacing between these elements is greater than the greatest diameter to be expected of the printing cylinders which are to be measured. A printing cylinder to be measured is placed on a support below the transverse beam of the carriage and parallel to the same so that the bracket which has been pivoted downwards into its operative position will embrace the printing cylinder as the carriage is lowered. The distance by which the carriage is lowered while the printing cylinder interrupts the light barrier is taken as the measure of the printing cylinder diameter.
Likewise known (U.S. Pat. No. 3,555,288) is an instrument for the photoelectric classification of objects, like sections of tree trunks. In this case the objects are movable on a guide means through a U-shaped, stationary rack. The rack comprises two hollow legs extending vertically upwardly from a horizontal transverse member, likewise being hollow, and they each include a vertical guide bar. On each of these two guide bars a carriage is movable up and down. One of these carriages carries a transmitter and the other one a receiver of a horizontal light barrier which is interrupted by the object to be measured. A motor is housed inside the transverse member to serve as the common drive of both carriages. The motor acts through a gear box on two chain drives mounted one each in the two legs of the rack and connected to a respective one of the two carriages.
The measuring accuracies obtainable with the two instruments described above are limited, both because of their structure and their designated purpose.
SUMMARY OF THE INVENTION
It is, therefore, the object of the invention to devise a measuring instrument for use in scanning dimensions, especially diameters, which instrument provides signals suitable to be evaluated with little computer expenditure and yet offering precise results of the measurements taken.
The object is met, in accordance with the invention, by a measuring instrument to scan dimensions, and particularly diameters of objects to be measured, comprising a guide means which defines a center place of the measuring instrument, a retaining fixture having means to hold an object to be measured in the center plane in such position that a dimension of interest will extend parallel to the guide means, a carriage supporting a transmitter at one side of the center place and a receiver at the other side for an energy beam which passes transversely of the center plane and of the dimension of interest, a distance measuring means to measure movements of the carriage along the guide means, and an evaluating means to determine the dimension of interest based on positions of the carriage at which the energy beam, first received by the receiver, is interrupted by the object to be measured and then again received, characterized in
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High-Speed Laser Scan Micrometer LS-5000 Series, 1996, Japan.
SLB Dia Measuring System KL150 Series, 1990, Japan.
Derwent-Abstract of DE 36 30 702 A, Germany.
Derwent-Abstract of DE 42 38 504 A, Germany.
Blum-Novotest GmbH
Browning Clifford W.
Pham Hoa Q.
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