CN202412951U - Protective circuit for printing head of dot matrix printer and printer thereof - Google Patents
Protective circuit for printing head of dot matrix printer and printer thereof Download PDFInfo
- Publication number
- CN202412951U CN202412951U CN2011205431138U CN201120543113U CN202412951U CN 202412951 U CN202412951 U CN 202412951U CN 2011205431138 U CN2011205431138 U CN 2011205431138U CN 201120543113 U CN201120543113 U CN 201120543113U CN 202412951 U CN202412951 U CN 202412951U
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- printhead
- circuit
- main control
- printer
- printing head
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Abstract
The utility model provides a protective circuit for a printing head of a dot matrix printer and the printer thereof. The circuit comprises a main control module, a printing head drive circuit, a backward voltage clamping circuit, an overheating protection circuit and a printing head coil. The control signal output terminal of the main control module is connected with the printing head drive circuit; one output terminal of the printing head drive circuit is connected with the printing head coil; the other end of the printing head coil is connected with a power supply; the other output terminal of the printing head drive circuit is connected with the backward voltage clamping circuit; one terminal of the overheating protection circuit is connected with printing head temperature signals and the other terminal is connected with an analog-to-digital (AD) channel of the main control module. The circuit has good stability and strong protectiveness, monitors temperature and overcurrent situation of the printing head in real time and effectively protects the printing head.
Description
Technical field
The utility model relates to the printer field, relates in particular to a kind of impact printer printhead holding circuit and printer thereof.
Background technology
Printer is the important output equipment that is widely used in the computer office system, realizes the purpose that electronic document is exported with the paper spare mode of needs through printer.
At present, the printhead of known impact printer is very important parts, and its price is valuable, and maintenance cost is high, in use also damages easily.Particularly in print procedure, often, printhead causes that temperature raises because of continuing to print, when temperature is elevated to the peak above its permission, will cause printhead to burn.For this reason, most impact printers adopt the mode of adding fin, improve the radiating effect of printhead.Yet the problem that existing radiating mode still can not avoid printhead to be burnt fully.In addition; When existing impact printer still continues to print under lacking the not enough situation of paper or paper width; Print needle also can print to data on roller or the type slug, makes the content that should beat on medium, and mistake is got to and printed on roller or the type slug; This is not only meaningless to the correct printing of medium, but also can cause damage to print needle.Existing in addition impact printer is printhead coil overcurrent protection function and influence its service life for want of also.Therefore be necessary prior art is improved,, reduce the printer use cost to improve print head longevity.
Summary of the invention
The purpose of the utility model is to provide a kind of impact printer printhead holding circuit and printer thereof.
The purpose of the utility model realizes through following technical scheme.
A kind of impact printer printhead holding circuit; Main control module, print-head drive circuit, backward voltage clamp circuit, overheating protection circuit and printhead coil; Said main control module control signal output is connected with print-head drive circuit; One output of print-head drive circuit is connected with the printhead coil, another termination power of printhead coil, and another output of print-head drive circuit is connected with said backward voltage clamp circuit; Said overheating protection circuit one termination printhead temperature signal, another termination main control modules A D passage.
Preferably; Said backward voltage clamp circuit comprises discharge triode, second resistance and second triode; One end of second resistance connects the base stage of discharge triode; The other end connects the colelctor electrode of second triode, the grounded emitter of second triode, and base stage is connected to the control signal output of main control module; The discharge triode colelctor electrode with connect power supply, its emitter stage is connected with print-head drive circuit.
Preferably, said discharge triode is the positive-negative-positive triode.
Preferably; Said overheating protection circuit comprises a current-limiting resistance, filter resistance, filter capacitor; One termination printhead temperature signal of current-limiting resistance is after another termination power, printhead temperature signal are strengthened driving through current-limiting resistance; Behind the RC filter network through filter resistance, filter capacitor composition, receive the AD passage of main control module.
A kind of printer comprises the main control module, the sensing module, communication module and the printing electromechanical module that are connected with this main control module, and said main control module comprises asic chip, also comprises having above-mentioned impact printer printhead holding circuit.
Preferably, said sensing module comprises that paper is to level sensor, trimming sensor, temperature sensor, printhead border sensor and print head sensor.
Preferably, said printing electromechanical module comprises word vehicle motor, chart drive motor and the contraposition motor that is connected with asic chip through motor driver, and the printhead that is connected with asic chip.
Preferably, said communication module comprises serial port, LPT and the USB mouth that is connected with asic chip.
Compared with prior art; The deficiency that the utility model can effectively overcome is excessive because of print load in the short time, temperature raises and burns printhead has overcome overcurrent simultaneously and causes that the printhead coil burns and wait deficiency, and can reduce in the print procedure loss to printhead; Prolong the print head maintenance cycle; Improve printing effect, thereby prolong printhead, reduce the operating cost that the client uses impact printer until printer complete machine service life.The utility model reliability is high, good stability, and protectiveness is strong, can monitor printhead temperature, overcurrent condition in real time, and printhead is effectively protected.
Description of drawings
Fig. 1 is the utility model impact printer structural principle block diagram;
Fig. 2 is the utility model printhead holding circuit theory diagram.
The specific embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also shown in Figure 1ly, the utility model deposit book printers comprise main control module 2, the sensing module 1 that is connected with this main control module 2, communication module 3, printhead holding circuit 4 and print electromechanical module 5.
Wherein:
Main control module 2 comprises asic chip, FLASH sram chip and microprocessor MCU chip, and printhead holding circuit 4 is electrically connected with asic chip.
See also the said printhead holding circuit of Fig. 2 theory diagram; Comprise: main control module, print-head drive circuit U1, backward voltage clamp circuit U2, overheating protection circuit U3 and printhead coil L; Main control module control signal output is connected with print-head drive circuit U1; The output of print-head drive circuit U1 is connected with printhead coil L, and another termination power V0 of printhead coil L, described backward voltage clamp circuit U2 comprise a discharge triode Q1, resistance R 2 and triode Q2; One end of resistance R 2 connects the base stage of discharge triode Q1; The other end connects the colelctor electrode of triode Q2, the grounded emitter of triode Q2, and base stage is connected to the control signal output of main control module.The colelctor electrode of discharge triode Q1 with meet power supply V0, its emitter stage is connected with print-head drive circuit U1, said discharge triode Q1 is the positive-negative-positive triode.
Said overheating protection circuit U3 comprises a current-limiting resistance R5, filter resistance R4, filter capacitor C1; The termination printhead temperature signal ST of current-limiting resistance R5 is after another termination power V0, printhead temperature signal ST strengthen driving through current-limiting resistance R5; Behind the RC filter network through filter resistance R4, filter capacitor C1 composition; Receiving the AD passage of main control module, is 0～1023 data signal with analog signal conversion, makes the main control module can monitor the temperature of printhead accurately.When printhead temperature surpassed safety value, the main control module stopped printhead and goes out pin, avoided printhead temperature to continue to raise.
Print electromechanical module 5 and also comprise word vehicle motor, chart drive motor and the contraposition motor that is connected with asic chip through motor driver, and the printhead that is connected with asic chip.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (8)
1. impact printer printhead holding circuit; It is characterized in that: main control module, print-head drive circuit, backward voltage clamp circuit, overheating protection circuit and printhead coil; Said main control module control signal output is connected with print-head drive circuit; One output of print-head drive circuit is connected with the printhead coil, another termination power of printhead coil, and another output of print-head drive circuit is connected with said backward voltage clamp circuit; Said overheating protection circuit one termination printhead temperature signal, another termination main control modules A D passage.
2. impact printer printhead holding circuit as claimed in claim 1; It is characterized in that; Said backward voltage clamp circuit comprises discharge triode, second resistance and second triode, and an end of second resistance connects the base stage of discharge triode, and the other end connects the colelctor electrode of second triode; The grounded emitter of second triode, base stage are connected to the control signal output of main control module; The discharge triode colelctor electrode with connect power supply, its emitter stage is connected with print-head drive circuit.
3. impact printer printhead holding circuit as claimed in claim 2 is characterized in that said discharge triode is the positive-negative-positive triode.
4. impact printer printhead holding circuit as claimed in claim 2; It is characterized in that said overheating protection circuit comprises a current-limiting resistance, filter resistance, filter capacitor, a termination printhead temperature signal of current-limiting resistance; Another termination power; After the printhead temperature signal is strengthened driving through current-limiting resistance, behind the RC filter network through filter resistance, filter capacitor composition, receive the AD passage of main control module.
5. printer; Comprise the main control module; The sensing module, communication module and the printing electromechanical module that are connected with this main control module, said main control module comprises asic chip, it is characterized in that: also comprise having each described impact printer printhead holding circuit of claim 1-4.
6. printer as claimed in claim 5 is characterized in that, said sensing module comprises that paper is to level sensor, trimming sensor, temperature sensor, printhead border sensor and print head sensor.
7. printer as claimed in claim 5 is characterized in that, said printing electromechanical module comprises word vehicle motor, chart drive motor and the contraposition motor that is connected with asic chip through motor driver, and the printhead that is connected with asic chip.
8. printer as claimed in claim 5 is characterized in that, said communication module comprises serial port, LPT and the USB mouth that is connected with asic chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205431138U CN202412951U (en) | 2011-12-22 | 2011-12-22 | Protective circuit for printing head of dot matrix printer and printer thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205431138U CN202412951U (en) | 2011-12-22 | 2011-12-22 | Protective circuit for printing head of dot matrix printer and printer thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202412951U true CN202412951U (en) | 2012-09-05 |
Family
ID=46737740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205431138U Expired - Lifetime CN202412951U (en) | 2011-12-22 | 2011-12-22 | Protective circuit for printing head of dot matrix printer and printer thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202412951U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102529458A (en) * | 2011-12-22 | 2012-07-04 | 深圳中航信息科技产业股份有限公司 | Stylus printer printing head guard circuit and printer |
| CN103770480A (en) * | 2012-10-17 | 2014-05-07 | 普印力公司 | Preventing coil overheating in line printer hammer bank |
| CN104085189A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Heating protective circuit |
-
2011
- 2011-12-22 CN CN2011205431138U patent/CN202412951U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102529458A (en) * | 2011-12-22 | 2012-07-04 | 深圳中航信息科技产业股份有限公司 | Stylus printer printing head guard circuit and printer |
| CN102529458B (en) * | 2011-12-22 | 2015-02-18 | 深圳中航信息科技产业股份有限公司 | Stylus printer printing head guard circuit and printer |
| CN103770480A (en) * | 2012-10-17 | 2014-05-07 | 普印力公司 | Preventing coil overheating in line printer hammer bank |
| CN104085189A (en) * | 2014-07-08 | 2014-10-08 | 北京美科艺数码科技发展有限公司 | Heating protective circuit |
| CN104085189B (en) * | 2014-07-08 | 2016-09-14 | 北京美科艺数码科技发展有限公司 | heating protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120905 |
|
| CX01 | Expiry of patent term |