GB1182215A - Thermal Printing System. - Google Patents
Thermal Printing System.Info
- Publication number
- GB1182215A GB1182215A GB44066/68A GB4406668A GB1182215A GB 1182215 A GB1182215 A GB 1182215A GB 44066/68 A GB44066/68 A GB 44066/68A GB 4406668 A GB4406668 A GB 4406668A GB 1182215 A GB1182215 A GB 1182215A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- switching
- elements
- terminal
- heaters
- 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
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
Abstract
1,182,215. Electric selective printing control. NATIONAL CASH REGISTER CO. 17 Sept., 1968 [2 Oct., 1967], No. 44066/68. Heading G4H. In a thermal printing system comprising a number of selectively energizable resistive thermal printing elements 24, Fig. 2, these elements are each connected in series with a triggerable switching element 22 and connected together in groups G1-G4, there being a plurality of selection lines 58 each connected to a first terminal 28 of one of the switching elements in each group, a second terminal 30 of each switching element in a group being connected to a common point and to group switching means, normally applying a first potential to the point but being capable of applying a second potential concurrently with the appication of a triggering signal to the first terminal of a selected switching element, this serving to trigger the element, the arrangement being such that a printing operation may be effected by selecting each group in turn and selected switching elements in the group. The elements 24 are resistive, made, for example of tin oxide which heats when a current flows through it. The heat marks a sensitized record material, certain ones of the elements 24 being selected to form the desired character as a pattern of dots. The cathodes 30 of each group are connected to the collector of a group selection transistor 20. Zener diodes 32 are connected across the transistors and a positive source is connected via resistor 34 to each diode to pass sufficient current through the Zener diode, when the transistor is cut off, to develop the Zener voltage. Initially all the transistors are non-conducting and the supply line 56 is energized by a positive voltage to bias all the silicon-controlled rectifiers. If a triggering voltage is applied on a selection line 58 the associated SCR will be further biased, but will still not conduct. However, if a selection signal is applied to a transistor 20 of Group 1 to cause it to conduct, the collector 38 is brought substantially to earth potential. The cathodes of the SCRs therefore first receive the Zener voltage, and then earth potential. A triggering current then applied to selected gate electrodes 28 causes those SCRs to switch to their low-impedance state allowing a large current to flow through the associated heaters 24. After the removal of the two selection signals, currents continue to flow in these heaters, and heaters of Groups 2, 3 and 4 are successively selected in the same way. When all the Groups have been energized, the power supply is removed from line 56 and the currents flowing in the SCRs decrease below the minimum holding current and they revert to their high-impedance state. In another form (Fig. 4, not shown) the silicon-controlled rectifiers are replaced by two-terminal semi-conductive triggerable switching devices e.g. as described in Specification 1,021,510. The arrangement is similar except that the sides of the heating elements 24 remote from the switching devices are connected in groups, each group being selected by a transistor and Zener diode circuit as described. The other sides of the switching devices from the heaters are connected to lines (as 58) which are coupled to the power supply via diodes and to switching terminals. A positive pulse, larger than the supply voltage, applied to the switching terminal causes the switching device to conduct and remain conducting until the supply is switched off. The possibility is mentioned of using light-activated semi-conductors controlled by rectifiers as switching elements.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US67232367A | 1967-10-02 | 1967-10-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1182215A true GB1182215A (en) | 1970-02-25 |
Family
ID=24698072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB44066/68A Expired GB1182215A (en) | 1967-10-02 | 1968-09-17 | Thermal Printing System. |
Country Status (4)
Country | Link |
---|---|
US (1) | US3467810A (en) |
DE (1) | DE1800137B2 (en) |
FR (1) | FR1587770A (en) |
GB (1) | GB1182215A (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3638197A (en) * | 1968-12-31 | 1972-01-25 | Texas Instruments Inc | Electronic printing input-output station |
JPS536355Y2 (en) * | 1972-06-05 | 1978-02-17 | ||
US3934695A (en) * | 1974-09-23 | 1976-01-27 | Hewlett-Packard Company | Method and apparatus for enhancing and maintaining character quality in thermal printers |
US3984844A (en) * | 1974-11-20 | 1976-10-05 | Hitachi, Ltd. | Thermal recording apparatus |
US3988569A (en) * | 1974-12-16 | 1976-10-26 | Texas Instruments Incorporated | Thermal printhead with memory |
JPS5262029A (en) * | 1975-11-15 | 1977-05-23 | Hitachi Ltd | Thermal recording device |
GB1585214A (en) * | 1976-05-31 | 1981-02-25 | Matsushita Electric Ind Co Ltd | Thermal head apparatus |
JPS5353223A (en) * | 1976-10-25 | 1978-05-15 | Epson Corp | Circuit for compensating voltage of thermal printer |
US4141018A (en) * | 1976-11-08 | 1979-02-20 | Tokyo Shibaura Electric Co., Ltd. | Thermal recording head and drive circuit |
US4103678A (en) * | 1977-04-21 | 1978-08-01 | American Medical Systems, Inc. | Nocturnal penile tumescense monitor |
DE3007465A1 (en) * | 1980-02-28 | 1981-09-10 | Philips Patentverwaltung Gmbh, 2000 Hamburg | CIRCUIT ARRANGEMENT FOR DRIVING A VARIETY OF IMAGE ELECTRODES FOR THE NON-MECHANICAL RECORDING |
FR2504756A1 (en) * | 1981-04-27 | 1982-10-29 | Thomson Csf | For thermal printer heating element - has varistor element with one part corresponding to current toward control transistor and other to re-looping between two current sources |
JPS59201878A (en) * | 1983-04-28 | 1984-11-15 | Tokyo Electric Co Ltd | Thermal printer |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2917996A (en) * | 1955-04-25 | 1959-12-22 | Burroughs Corp | Thermal printer |
US3354817A (en) * | 1961-06-30 | 1967-11-28 | Burroughs Corp | High speed thermal matrix printer |
NL125948C (en) * | 1963-07-02 | |||
US3323241A (en) * | 1965-10-24 | 1967-06-06 | Texas Instruments Inc | Passive information displays |
US3409902A (en) * | 1966-05-27 | 1968-11-05 | Texas Instruments Inc | High speed thermal printer |
-
1967
- 1967-10-02 US US672323A patent/US3467810A/en not_active Expired - Lifetime
-
1968
- 1968-09-17 GB GB44066/68A patent/GB1182215A/en not_active Expired
- 1968-09-30 FR FR1587770D patent/FR1587770A/fr not_active Expired
- 1968-10-01 DE DE19681800137 patent/DE1800137B2/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
FR1587770A (en) | 1970-03-27 |
DE1800137B2 (en) | 1971-05-06 |
DE1800137A1 (en) | 1971-02-11 |
US3467810A (en) | 1969-09-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1182215A (en) | Thermal Printing System. | |
US3354817A (en) | High speed thermal matrix printer | |
US3243665A (en) | Synchronizing arrangement | |
US3107341A (en) | Circuit arrangement for marking the points of intersection of a resistancediode matrix | |
GB925464A (en) | ||
US4091391A (en) | Drive system for thermal recording apparatus | |
US3251036A (en) | Electrical crossbar switching matrix having gate electrode controlled rectifier cross points | |
US3456164A (en) | Solenoid energizing means | |
DE1283283B (en) | Memory circuit with two transistors of the complementary type | |
GB2108346A (en) | A memory device | |
US3047741A (en) | Multiple channel electronic switching circuit | |
US3343130A (en) | Selection matrix line capacitance recharge system | |
US3320431A (en) | Multi-station variable timing apparatus | |
US3364391A (en) | Regenerative drive circuit with current limiting | |
US3210741A (en) | Drive circuit for magnetic elements | |
US3698012A (en) | Multi-character electronic display | |
US3665400A (en) | Switching circuits and method for diode elements in conductor selection matrices | |
US3260861A (en) | Stepping switches employing blocking means selectively disabling stepping | |
US2928080A (en) | Static memory system | |
US3551694A (en) | Fluid flow simulation apparatus | |
US3089967A (en) | Pulse generator | |
US3587061A (en) | Time-shaped lamp control apparatus employing lamp filament resistance as an integral status memory | |
US3309535A (en) | Switching circuitry for semiconductive controlled rectifiers | |
US3419887A (en) | Character printer utilizing a rope memory | |
US3657564A (en) | Circuit providing fast pulse rise and fall times |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |