Electronic pocket calculator
US4372694A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1981 |
| Grant date | Feb 8, 1983 |
| Priority date | — |
| Expiry date | Jan 7, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06C11/04
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The calculator is small enough and well protected enough to be carried in the pocket. In addition to a keyboard 28, circuit board 29, batteries 18 and an LCD data display 91, there is a printer comprising a platen 36 which draws paper from a roll in a compartment 101. A thermal printing head 33 is reciprocated along the writing line by a pin 44 engaging in an eccentric cam groove in a disc 46 rotated by a crown wheel 53 and a pinion 54 on the shaft of a motor. Another cam-follower pin 64 reciprocates a slide 66 which advances the platen incrementally after each traverse of the head 33. A slidable cover 14 is shown open, exposing the printing mechanism and operating a switch which enables the printer. Results appear on the LCD display and are printed. When the cover is slid closed it protects the printing mechanism and disables it via the switch. The calculator can nevertheless be used without the printer, results being displayed only on the LCD display 91. The paper roll is carried in a removable container 132 to which access is obtained by depressing a detent tongue and sliding the cover still further open. Cooperating parts of the container and the calculator frame guide the lead…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.