Abstract: An X-ray apparatus has a motor for moving its components in different directions. A collision sensor is formed by a bladder attached to a component of the apparatus and deformation of the bladder produces a change in the pressure of air within the bladder. The bladder has an air vent to the atmosphere which can be sealed by operation of a valve. A pressure sensor produces two control signals when the pressure within the bladder exceeds first and second threshold levels respectively. The second threshold level is greater in magnitude than said first threshold level. The first control signal closes the valve and causes a motor control circuit to discontinue any application of electricity to the motor. The second control signal opens a switch through which electricity normally flows to the motor. A mechanism also is provided to simulate a collision by compressing the bladder to test the operation of the detection system.

Abstract: A collision sensor specially adapted for a power driven x-ray imaging apparatus includes a face collision sensor and an edge collision sensor. The face collision sensor has two annular plates which are biased apart longitudinally by three flat springs which are equiangularly spaced apart around the perimeter of the plates. Three equiangularly spaced cables hold the plates in parallel planes with the springs prestressed and collapse to allow the plates to be compressed together. Two sets of three switches each reside at equal angular intervals between the plates, with at least one of the switches of the first set being actuated when any point across the face of the sensor has been moved a predetermined longitudinal distance. At least one of the switches of the second set is actuated when the point on the face of the sensor has been moved a further predetermined longitudinal distance. An edge collision sensor includes a closed air bladder which surrounds the face collision sensor and in which a vacuum is drawn.

Abstract: A spot-film device includes an inner carriage whose three members are movable with respect to an outer carriage to provide a cassette tray that will accommodate varying cassette sizes. After insertion of a cassette, the inner carriage automatically contracts to a clamping position and is then movable longitudinally of the table to provide selective placement of the cassette for x-ray exposure. Lateral movement for that purpose is brought about by movement of the outer carriage. A single motor is used to provide both longitudinal clamping and longitudinal transport of the cassette while another motor provides both lateral clamping and lateral transport thereof. The lateral drive mechanism also provides for automatic ejection of a cassette after exposure.