Collision detection control system.

摘要

An X-ray apparatus (10) has a motor for moving its components in different directions. A collision sensor (12) is formed by a bladder (30) attached to a component of the apparatus and deformation of the bladder produces a change in the pressure of air within the bladder (30). The bladder has an air vent (46) to the atmosphere which can be sealed by operation of a valve (44). A pressure sensor (40) produces two control signals when the pressure within the bladder (30) 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 (44) and causes a motor control circuit (66) to discontinue any application of electricity to the motor. The second control signal opens a switch (64) through which electricity normally flows to the motor. A mechanism also is provided to simulate a collision by compressing the bladder (30) to test the operation of the detection system. <IMAGE>