Solenoid impact print hammer with uniform free flight time
US4407193A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1980 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Jun 16, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J9/48
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In an impact printer including a print wheel having a plurality of selectable character type bearing elements for respectively printing a plurality of characters, said print wheel being rotatable for selectively positioning selected type elements in successive print positions, impact means impellable against the selected elements to drive said elements against the printing medium and means for impelling the impact means against said selected type element, the present invention provides the improvement comprising the combination of means for sensing the flight time of the impelled impact means until impact by sensing variations in the velocity of said impact means, means for comparing the sensed flight time to a predetermined ideal flight time, and means for selectively varying the amplitude of the current to the impelling means to adjust the sensed flight time to equal the ideal flight time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.