Drive circuit for printing head
US4162131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1977 |
| Grant date | Jul 24, 1979 |
| Priority date | — |
| Expiry date | Nov 2, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A drive circuit is responsive to input pulses to supply drive energy pulses to the printing head of a matrix printer so as to produce constant impact forces and constant print intensity over a wide range of print rates by decreasing the energy of the drive pulses as a function of the time interval between successive input pulses as said interval diminishes below a predetermined value. In one embodiment the amplitude of the drive pulses is reduced as the frequency of the input pulses exceeds the predetermined value. In a second embodiment the duration of the drive pulses is reduced as the frequency of the input pulses exceeds the predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.