Drive arrangements for a strip of cuvettes in analytical device
The invention relates to a drive arrangement for a series of cuvettes (C) forming a strip ( 2 ) fixed by means of a film ( 3 ) in an automatic analytical device ( 1 ), comprising at least one toothed belt ( 12 ), the teeth of which engage with the corresponding forms of the cuvettes. The above finds application in an automatic analytical device, particularly for the determination of the rate of change of the physical state of a medium.
1. A device for driving a series of bowls comprising:
a series of bowls, each of said bowls comprising a flat-shaped body having a bottom and, opposite said bottom an opening located between two opposing edges extended outwardly at right angles with respect to said body by two respective shoulders provided with two respective protuberances, said shoulders having a shape of an isosceles trapezium having a major base which is integral with the bowl and two oblique edges;
a film shaped in the form of a tape having two lateral borders parallel to a longitudinal axis these borders being provided with successive pairs of holes respectively formed on the borders, and with trapezoid cuts and teeth having oblique edges forming serrated profiles, each of said protuberances being engaged forcefully in the holes of one said pairs for removably fixing said bowl on said tape with said oblique edges of said shoulders extending in prolongation of oblique edges of said teeth, the teeth of the serrated profiles being hence extended by said shoulders; and
a notched belt provided with notches which gear between the teeth of the serrated profile extending by said shoulders to ensure a driving with a centering and an indexing of the bowls.
2. The device according to claim 1 wherein said belt is an endless belt guided at each extremity by rollers.
3. The device according to claim 2 wherein at least one of the rollers is driven in rotation by a motor.
4. The device according to claim 1 wherein the notches of said belt are spaced by a distance equal to a multiple of the width of the bowls.
5. The device according to claim 1 which comprises a rail in which said bowls are guided.
6. The device according to claim 5 wherein said rail has a U-shaped cross section
comprising two vertical wings which are extended at a right angle by two shoulders.
7. The device according to claim 6 wherein the shoulders of said bowl rest on the shoulders of the rail.