Print medium advancing mechanism including print head retraction
US4444521A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1982 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Aug 2, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S400/904
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A single stepper motor is utilized in a printing device to lift a print head from the surface of recording material upon the initial angular rotation of the stepper motor output drive shaft and to move the recording material within the printing device upon further rotation of said drive shaft. The print head is returned to the surface of the recording material by operating the stepper motor in the reverse direction until the output drive shaft of the stepper motor traverses an angular displacement equal but opposite to the initial angular displacement. A cam surface couples the output drive shaft of the stepper motor to a drive gear and transforms the initial angular displacement of the output drive shaft into linear motion to lift the print head from the surface of the recording material. Further rotation of the stepper motor drive shaft rotates the drive gear to move material within the printing device. Cam configurations are disclosed for movement of the paper in one or both directions through the printing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.