Print Velocity Pendulum
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Correct print impact velocity is critical in obtaining optimum print quality on single-element typewriters. Therefore, it is necessary to accurately measure the typehead velocity or impact force to guarantee good print quality. Techniques involving the use of load cells with quartz crystals to measure print impact force have several drawbacks including frequent rubber pad replacement, frequent transducer calibration, critical machine adjustments, costly electronics, and qualified technicians are required for operation and maintenance. These limitations prohibit the use of quartz load cells to measure impact force in anything but a laboratory environment. A method to accurately measure the typehead velocity or impact force which will allow continuous use in a quality control situation is described herein.