APARELHO E METODO PARA INSPECIONAR DE FORMA OTICA SUBSTANCIALMENTE TODA A SUPERFICIE CILINDRICA DE UM OBJETO CILINDRICO

• Main Authors: JEROME S. OSMALOV, GARY GROLLIMUND, BARRY SCOTT SMITH, BHANU M. EVANI, HERBERT C. LONGEST JR
• Format: Patent
• Language: Portuguese
• Published: 23.11.1993
• Edition: 5
• Subjects: CIGARETTES; CIGARS; HUMAN NECESSITIES; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MACHINES FOR MAKING CIGARS OR CIGARETTES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PERFORMING OPERATIONS; PHYSICS; POSTAL SORTING; SEPARATING SOLIDS FROM SOLIDS; SMOKERS' REQUISITES; SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTEDPIECE-MEAL, e.g. BY PICKING; TESTING; TOBACCO; TRANSPORTING

In the embodiment, the entire cylindrical surface of a cylindrical object such as a cigarette is optically inspected by first inspecting at least 180 DEG of the circumference of a first side of the surface, and then inspecting at least 180 DEG of the circumference of the other side. Each of the inspection stations illuminates more than 180 DEG of the circumference and images the surface from two angularly spaced directions to ensure that at least 180 DEG of the circumference is seen at each station. Any object having a defective image is automatically rejected from the apparatus, and the images and other statistical information regarding the performance of the system are displayed by the system. The images are formed in such a way as to greatly increase the speed at which the inspection system operates so that it an keep up with the very high rates at which objects such as cigarettes are made in modern machinery (e.g., approximately 10,000 cigarettes per minute). The images are analyzed using techniques which make possible the detection of very small defects and also compensate for possible nonuniform illumination of the objects in the circumferential direction. In another embodiment, inspection of completed cigaretes is accomplished by the cigarettes travelling on a rolling drum 1 pas a single stationary rolling block 12 with perferably two cameras 5,14 connected to a vision system. The first camera views the cigarette before the rolling block, the cigarette is then rolled approximately 180 DEG and then the second camera views the previousl hidden portion of the cigarette. Cigarettes are accepted or rejected based on a comparison of the viewed cigarettes to a predetermined set of characteristics.