Abstract: A method for measuring geometric deviations of a doctor blade using an apparatus, including initializing the apparatus, mounting the doctor blade to a doctor blade holding device, illuminating the doctor blade with light, positioning a first portion of the doctor blade at an optical axis of a camera, obtaining a first image signal from the camera that corresponds to the first portion of the doctor blade, generating a first doctor blade geometry value associated with the first image signal, and determining if a first geometric deviation of the doctor blade is within acceptable tolerance using the first doctor blade geometry value.

Abstract: An apparatus for measuring geometric deviations in a doctor blade includes a camera defining an optical axis. The optical axis defines an X-axis in a Cartesian coordinate system. An origin of the Cartesian coordinate system defines an intersection point. A first light source has a first central axis. The first central axis is angularly disposed from the X-axis by a first angle with respect to the X-axis. A second light source has a second central axis. The second central axis is angularly disposed from the X-axis by a second angle with respect to the X-axis. A doctor blade holding device is configured to mount a doctor blade wherein a portion of the doctor blade to be measured is positioned at the intersection point.

Abstract: A method for measuring geometric deviations of a doctor blade using an apparatus, including initializing the apparatus, mounting the doctor blade to a doctor blade holding device, illuminating the doctor blade with light, positioning a first portion of the doctor blade at an optical axis of a camera, obtaining a first image signal from the camera that corresponds to the first portion of the doctor blade, generating a first doctor blade geometry value associated with the first image signal, and determining if a first geometric deviation of the doctor blade is within acceptable tolerance using the first doctor blade geometry value.

Abstract: An apparatus for measuring geometric deviations in a doctor blade includes a camera defining an optical axis. The optical axis defines an X-axis in a Cartesian coordinate system. An origin of the Cartesian coordinate system defines an intersection point. A first light source has a first central axis. The first central axis is angularly disposed from the X-axis by a first angle with respect to the X-axis. A second light source has a second central axis. The second central axis is angularly disposed from the X-axis by a second angle with respect to the X-axis. A doctor blade holding device is configured to mount a doctor blade wherein a portion of the doctor blade to be measured is positioned at the intersection point.

Abstract: A keyboard assembly (FIG. 1, 11) is constructed of first light transmission members (13) second light transmission members (15), a key actuation assembly (17) having a matrix of keybuttons (25), plural light source assembly (19) and plural sensor assembly (21). Each light source on assembly (19) is exclusively and sequentially energized causing its light to be transmitted through the first light transmission member (13) to be split up and deflected downwardly by the surfaces (43) and then rightwardly by the surfaces (45) to emanate through the surfaces (47) to enter the surfaces (49) of the second light transmission member. Actuation of a keybutton (25) causes its associated interrupter (29) to assume a light blocking position between the first light transmission member (13) and a second light transmission member (15). Light passing through the second light transmission member (15) to the sensor array indicates that none of the interrupters (29) have blocked the light path.