| 摘要 |
The printer records images in the form of dots on electrical discharge-sensitive paper. Three groups of five styli are mounted on a rotor. The paper is fed continuously through a curved guide in a direction perpendicular to the plane of rotation of the rotor. A disc is mounted on the same shaft and rotates with the rotor. The disc is transparent but has opaque lines spaced around its edge with a spacing corresponding to the desired spacing between dots. This divisional patent is directed to the feature in which three detectors, each comprising a lamp and photocell combination, detect the lines and produce corresponding timing pulses which are used to enable the styli. Each group of styli is enabled to operate only when it is in proper printing position. Location of the stopping and starting positions for two of the three groups is controlled by changing the time lapse between the enablement of adjacent groups. This is used to adjust the alignment of printed characters by simply moving the detectors relative to one another, thus avoiding movement of the styli and the attendant problems caused by such movement.
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