improvements in control systems and control the transfer of a moveable head on a plan in reference to coordinates

摘要

This invention relates to a system in which a head is displaced from, but is in contiguous relationship to, a platen and is driven relative to the platen along either a single axis or a pair of coordinate axes relative to the platen. The head and the platen constitute a motor which is energized to drive the head relative to the platen by generating a force as a result of a change of vector caused by translating a magnetomotive vector. For example, the motor may be induction or hysteresis motor. Means are associated with the head to detect the position of the head relative to the platen as the head is moved relative to the platen. Means may also be associated with the head for preventing the head from rotating as it is moved along the platen. A servo loop may further be included for producing controlled displacements of the head relative to the platen.