Abstract: A passive motion exerciser for simultaneously flexing the hip and knee joints of a human leg has a base portion with an inclined guide member positionable parallel to a line extending through the ankle and hip joints of the leg, a reversible motor-driven drive member movable upwardly and downwardly along the inclined guide member, and an elongated leg support frame structure securable to the leg and longitudinally adjustable to fit legs of varying lengths. The support frame structure has a first end portion positionable adjacent the ankle joint, a second end portion positionable between the knee and hip joint, and a pivoted intermediate portion positionable adjacent the knee joint. A connecting member is attached to the guide member for movement therealong parallel to the drive member and is connected to the first outer end portion of the support frame structure. The second outer end portion of the support frame structure is pivotally interconnected to the drive member by a cam-driven linkage structure.

Abstract: A character presence detector providing a decision on character presence at the data rate, that is the rate at which the character presence detector receives binary data bits. The binary data bits correspond to the output of a self-scanning photocell array and each data bit corresponds to the output of one of the cells of the array. The binary data bits comprise a binary stream which contains information representing characters on a written medium. The stream of binary data bits which is divided into scans corresponding to scans of the photocell array, is received by a memory within the character presence detector. Each binary bit has a unique position within its particular scan. The memory provides as outputs the data bits corresponding to a certain position within each of the scans within the memory simultaneously. Each position within the scans is sequentially selected as the output of the memory.