Abstract: A mechanism for registering the tape contained within a cassette around a helical-scan head drum mechanism includes a sensor for sensing the presence of the tape cassette in a proper position for beginning the process of engagement of the tape in the cassette with the head assembly in the device. A symmetrical engagement mechanism includes two tape extraction roller blocks which sit at a first disengaged position. A tape extraction roller member for engaging the tape is mounted on each tape extraction roller block. When the presence of the cassette is sensed, the tape extraction roller blocks move along a predetermined path to a second, engaged position wherein the tape is correctly positioned around the head assembly. At a predetermined position along the path, a pair of symmetrically positioned entry-and-exit positioning rollers engage the tape and move it into position for passing it by the tape heads.

Abstract: A mechanism for registering the tape contained within a cassette around a hellical-scan head drum mechanism includes means for sensing the presence of the tape cassette in a proper position for beginning the process of engagement of the tape in the cassette with the head assembly in the device. A symmetrical engagement mechanism includes two tape extraction roller blocks which sit at a first disengaged position. A tape extraction roller member for engaging the tape is mounted on each tape extraction roller block. When the presence of the casssette is sensed, the tape extraction roller blocks move along a predetermined path to a second, engaged position wherein the tape is correctly positioned around the head assembly. At a predetermined position along the path, a pair of symmetrically positioned entry-and-exit positioning rollers engage the tape and move it into position for passing it by the tape heads.

Abstract: A tape withdrawal and positioning system is provided for withdrawing tape from its initial position within a tape cassette and positioning it in proximity to or in contact with a tape recording and/or reproducing apparatus. The tape withdrawal and positioning system comprises a pair of lever arms having tape guide posts adjustable between an initial position wherein the tape guide posts are positioned behind an access portion of the tape within the tape cassette and an operating position whereon the lever arms are extended and the tape guide posts are positioned in proximity to the recording and/or reproducing apparatus. In the operating position, and tape is in contact with a portion of the recording and/or reproducing apparatus.

Abstract: A vise jaw assembly interchangeable with conventional jaws for precision vises commonly used for holding a workpiece in relation to a cutting tool such as the milling tool of a milling machine. The assembly includes a rotateable or inclineable platform for supporting the workpiece at a selected angle precisely controlled by an indexed rotator protruding through a window on the top surface of the jaw and connected to the platform by means of a shaft extending beyond the face of the jaw toward the opposing jaw.

Abstract: Stable diazonium catalyst solutions are provided in which the catalyst is dissolved in an organic sulfone. The catalyst solutions have greatly extended shelf-life while at the same time retain the ability to rapidly cure epoxy resins upon exposure to an energy source.Polymerizable compositions of the two-package type, comprising polymerizable epoxy materials and such catalyst solutions are also provided.