Document stacking table lowering method, apparatus and controlling circuitry therefor
US4189133A · kind A · utility
28Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1978 |
| Grant date | Feb 19, 1980 |
| Priority date | — |
| Expiry date | Nov 3, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S414/115
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A document stacking table is lowered in steps under electronic control as the documents accumulate. A predetermined number of documents are stacked, after which the table is lowered by a predetermined amount. An optical sensing arrangement is used to determine the effective top of the stack of documents within the limits of "light sensed" and the "absence of light". If light is sensed, the count is increased and the table lowered again; in the absence of light the count is decreased and the table is again lowered. Thus the stacking table will be lowered by a fixed amount to the level of least error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.