GB574492A - Improvements in or relating to apparatus for sensing electrically conductive marks on record cards or sheets of moisture absorbent material - Google Patents
Improvements in or relating to apparatus for sensing electrically conductive marks on record cards or sheets of moisture absorbent materialInfo
- Publication number
- GB574492A GB574492A GB53044A GB53044A GB574492A GB 574492 A GB574492 A GB 574492A GB 53044 A GB53044 A GB 53044A GB 53044 A GB53044 A GB 53044A GB 574492 A GB574492 A GB 574492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- marks
- brushes
- sensing
- valve
- conductivity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
574,492. Statisticalapparatus. BRITISH TABULATING MACHINE CO., Ltd. Jan. 11, 1944, No. 530. Convention date, Jan. 12, 1943. [Class 106 (i)] In apparatus for emitting electrical impulses on the sensing of electrically conducting marks on moisture-absorbing material, means are provided for sensing the conductivity of the material and .reducing the voltage applied to the means for sensing the conducting marks when the conductivity of the material increases, so that impulses will continue to be emitted in accordance with conducting marks only. The record sheet S with conducting marks D is adapted to move in the direction of the arrow under sets of brushes arranged above each column of marks. The outer brushes BE of a set are connected through a lead 10 to the positive side of a 110 volt circuit and the centre brush BC is coupled through a lead 12 and resistance R to the grid G of a valve A. Current flows in the anode circuit of the valve to operate a magnet M when the potential of the grid G is raised due to the brushes contacting a conducting mark. A set of brushes for sensing the conductivity of the material is arranged to co-operate with a column having no conductive marks. The outer brushes of the set are connected to the positive side of the 110 volt circuit through the wire 10 and the centre brush is connected by a wire 14 to a socket 15 connected to the grid G<1> of a valve C, the normal negative bias of which is sufficient to render the valve non-conductive. Increase of conductivity of the material reduces this grid bias until the valve becomes conductive with consequent reduction of voltage in line 10 due to increased voltage drop in resistance R. This decreased voltage is sufficient for sensing the conducting marks due to the increase in conductivity of the material to which they are applied. Instead of a separate set of brushes, a special brush SB coacting with an outer brush BE of a set may be used, the resistance R<2> being replaced by one of lower value or the grid bias on valve C being reduced accordingly.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US472169A US2377783A (en) | 1943-01-12 | 1943-01-12 | Record sensing means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB574492A true GB574492A (en) | 1946-01-08 |
Family
ID=23874459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB53044A Expired GB574492A (en) | 1943-01-12 | 1944-01-11 | Improvements in or relating to apparatus for sensing electrically conductive marks on record cards or sheets of moisture absorbent material |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2377783A (en) |
| DE (1) | DE843322C (en) |
| GB (1) | GB574492A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL70891C (en) * | 1945-06-30 | 1900-01-01 | ||
| US3044693A (en) * | 1957-10-21 | 1962-07-17 | Frederick H Flam | Match point duplicate bridge scorer |
| US3088665A (en) * | 1958-12-04 | 1963-05-07 | Ibm | Clipping level control apparatus |
| USRE25686E (en) * | 1959-03-02 | 1964-11-17 | Mark sensing lumber defect cutter | |
| US3293611A (en) * | 1963-02-26 | 1966-12-20 | Curtiss Wright Corp | Switch scanning system |
| US3461276A (en) * | 1965-10-20 | 1969-08-12 | Western Union Telegraph Co | Reusable data card |
| US3818335A (en) * | 1972-04-17 | 1974-06-18 | Brown & Williamson Tobacco | System and method for detecting amounts of conductive material on a moving web |
| CH582391A5 (en) * | 1972-07-21 | 1976-11-30 | Maymarev Nikolay | |
| US4214153A (en) * | 1978-08-10 | 1980-07-22 | Ralph Ogden | Tape and tape reader arrangement for programmable controllers |
| DE2952992A1 (en) * | 1978-08-10 | 1981-01-08 | R Ogden | PROGRAMMABLE CONTROLLER SYSTEM FOR INDUSTRIAL PROCESS APPARATUS |
| US4214501A (en) * | 1978-10-19 | 1980-07-29 | Miklos Von Kemenczky | Musical composer instrument and electronic player (electronic composer) |
| US4313087A (en) * | 1980-02-07 | 1982-01-26 | Weitzen Edward H | Apparatus for detecting electrically conductive coatings on documents |
-
1943
- 1943-01-12 US US472169A patent/US2377783A/en not_active Expired - Lifetime
-
1944
- 1944-01-11 GB GB53044A patent/GB574492A/en not_active Expired
-
1950
- 1950-09-22 DE DEJ2046A patent/DE843322C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2377783A (en) | 1945-06-05 |
| DE843322C (en) | 1952-07-07 |
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