CN102529458B - Stylus printer printing head guard circuit and printer - Google Patents
Stylus printer printing head guard circuit and printer Download PDFInfo
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- CN102529458B CN102529458B CN201110434788.3A CN201110434788A CN102529458B CN 102529458 B CN102529458 B CN 102529458B CN 201110434788 A CN201110434788 A CN 201110434788A CN 102529458 B CN102529458 B CN 102529458B
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- printhead
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- control module
- printing head
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Abstract
The invention provides a stylus printer printing head guard circuit and a printer. The circuit comprises a main control module, a printing head drive circuit, a backward voltage clamping circuit, a thermal protection circuit and a printing head coil. The control signal output end of the main control module is connected with the printing head drive circuit, one output end 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 end of the printing head drive circuit is connected with the backward voltage clamping circuit, one end of the thermal protection circuit is connected with printing head temperature signals, and the other end of the thermal protection circuit is connected with an analog to digital (AD) channel of the main control module. The stylus printer printing head guard circuit and the printer are high in reliability, good in stability, strong in protectiveness and capable of monitoring the printing head temperature and overcurrent situations in real time, and effectively protect the printing head.
Description
Technical field
The present invention relates to printer field, particularly relate to a kind of needle type printer printing head protection circuit and printer thereof.
Background technology
Printer is the important output equipment be widely used in computer office system, is realized the object exported in the paper mode needed by electronic document by 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 easily damages.Particularly in print procedure, often cause temperature to raise because printhead continues to print, when temperature increases above the peak of its permission, printhead will be caused to burn.For this reason, most impact printer adopts the mode of adding fin, improves the radiating effect of printhead.But existing radiating mode still can not avoid printhead by the problem of burning completely.In addition, existing impact printer when scarce paper or paper width inadequate still continue print time, print needle also can by data-printing on roller or type slug, make to beat the content on medium, get to by mistake and print on roller or type slug, this is not only meaningless to the correct printing of medium, but also can cause damage to print needle.Existing impact printer also for want of printhead coil overcurrent protection function and affect its service life in addition.Therefore be necessary to improve prior art, to improve print head longevity, reduce printer use cost.
Summary of the invention
The object of the present invention is to provide a kind of needle type printer printing head protection circuit and printer thereof.
The object of the invention is to be achieved through the following technical solutions.
A kind of needle type printer printing head protection circuit, comprise main control module, print-head drive circuit, backward voltage clamp circuit, overheating protection circuit and printhead coil, described main control module control signal output is connected with print-head drive circuit, one output of print-head drive circuit is connected with printhead coil, another termination power of printhead coil, another output of print-head drive circuit is connected with described backward voltage clamp circuit, described overheating protection circuit one termination plays print head temperature signal, another termination main control module AD passage;
Described overheating protection circuit comprises a current-limiting resistance, filter resistance, filter capacitor; one end of current-limiting resistance connects printhead temperature signal; another termination power; after printhead temperature signal strengthens driving by current-limiting resistance; after the RC filter network that resistance, filter capacitor form after filtering; receive the AD passage of main control module, analog signal is converted to the data signal of 0 ~ 1023, enable main control module monitor the temperature of printhead accurately.When printhead temperature exceedes safety value time, main control module stops printhead going out pin, avoids printhead temperature to continue to raise.
Preferably, described backward voltage clamp circuit comprises a discharge diode, the second resistance and the second triode, one end of second resistance connects the base stage of discharge diode, the other end connects the colelctor electrode of the second triode, the grounded emitter of the second triode, base stage is connected to the control signal output of main control module; The colelctor electrode of discharge diode with connect power supply, its emitter stage is connected with print-head drive circuit.
Preferably, described discharge diode is PNP type triode.
A kind of printer, comprise main control module, the sensing module be connected with this main control module, communication module and printing electromechanical module, described main control module comprises asic chip, also comprises and has above-mentioned needle type printer printing head protection circuit.
Preferably, described sensing module comprises paper to level sensor, trimming sensor, temperature sensor, printhead border sensor and print head sensor.
Preferably, described printing electromechanical module comprises the word vehicle motor, chart drive motor and the contraposition motor that are connected with asic chip by motor driver, and the printhead be connected with asic chip.
Preferably, described communication module comprises the serial port, LPT and the USB port that are connected with asic chip.
The present invention compared with prior art, the present invention effectively can overcome because print load in the short time is excessive, temperature raises and burn the deficiency of printhead, overcome overcurrent simultaneously and cause the deficiencies such as printhead coil burnout, and the loss that can reduce to printhead in print procedure, extend the print head maintenance cycle, improve printing effect, thus extend printhead until printer complete machine service life, reduce the operating cost that client uses impact printer.Reliability of the present invention is high, good stability, and protectiveness is strong, can monitor printhead temperature, overcurrent condition in real time, carry out available protecting to printhead.
Accompanying drawing explanation
Fig. 1 is impact printer structural principle block diagram of the present invention;
Fig. 2 is printhead protection circuit theory diagram of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to shown in Fig. 1, deposit book printers of the present invention comprise main control module 2, the sensing module 1 be connected with this main control module 2, communication module 3, printhead protection circuit 4 and print electromechanical module 5.
Wherein:
Main control module 2 comprises asic chip, FLASH sram chip and Micro-processor MCV chip, and printhead protection circuit 4 is electrically connected with asic chip.
Refer to printhead protection circuit theory diagram described in Fig. 2, 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, one output of print-head drive circuit U1 is connected with printhead coil L, another termination power V0 of printhead coil L, described backward voltage clamp circuit U2 comprises a discharge diode Q1, resistance R2 and triode Q2, one end of resistance R2 connects the base stage of discharge diode Q1, the colelctor electrode of other end connecting triode Q2, the grounded emitter of triode Q2, base stage is connected to the control signal output of main control module.The colelctor electrode of discharge diode Q1 with meet power supply V0, its emitter stage is connected with print-head drive circuit U1, and described discharge diode Q1 is PNP type triode.
Described overheating protection circuit U3 comprises a current-limiting resistance R5, filter resistance R4, filter capacitor C1; one end of current-limiting resistance R5 meets printhead temperature signal ST; another termination power V0; after printhead temperature signal ST strengthens driving by current-limiting resistance R5; after the RC filter network that resistance R4, filter capacitor C1 form after filtering; receive the AD passage of main control module, analog signal is converted to the data signal of 0 ~ 1023, enable main control module monitor the temperature of printhead accurately.When printhead temperature exceedes safety value time, main control module stops printhead going out pin, avoids printhead temperature to continue to raise.
Sensing module 1 comprises paper to level sensor, trimming sensor, temperature sensor, printhead border sensor and print head sensor.
Communication module 3 comprises the serial port, LPT and the USB port that are connected with asic chip.When printer needs connected to the network, communication module 3 is also arranged through the network interface that network controller is connected with ASIC.In other embodiments, communication module 3 can arrange the connectivity port of other combination.
Print electromechanical module 5 and also comprise the word vehicle motor, chart drive motor and the contraposition motor that are connected with asic chip by motor driver, and the printhead be connected with asic chip.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a needle type printer printing head protection circuit, it is characterized in that: comprise main control module, print-head drive circuit, backward voltage clamp circuit, overheating protection circuit and printhead coil, described main control module control signal output is connected with print-head drive circuit, one output of print-head drive circuit is connected with printhead coil, another termination power of printhead coil, another output of print-head drive circuit is connected with described backward voltage clamp circuit, described overheating protection circuit one termination plays print head temperature signal, another termination main control module AD passage,
Described overheating protection circuit comprises a current-limiting resistance, filter resistance, filter capacitor, one end of current-limiting resistance connects printhead temperature signal, another termination power, after printhead temperature signal strengthens driving by current-limiting resistance, resistance after filtering, after the RC filter network of filter capacitor composition, receive the AD passage of main control module, analog signal is converted to the data signal of 0 ~ 1023, main control module is enable to monitor the temperature of printhead accurately, when printhead temperature exceedes safety value time, main control module stops printhead going out pin, printhead temperature is avoided to continue to raise.
2. needle type printer printing head protection circuit as claimed in claim 1, it is characterized in that, described backward voltage clamp circuit comprises a discharge diode, the second resistance and the second triode, one end of second resistance connects the base stage of discharge diode, the other end connects the colelctor electrode of the second triode, the grounded emitter of the second triode, base stage is connected to the control signal output of main control module; The colelctor electrode of discharge diode with connect power supply, its emitter stage is connected with print-head drive circuit.
3. needle type printer printing head protection circuit as claimed in claim 2, it is characterized in that, described discharge diode is PNP type triode.
4. a printer; comprise main control module; the sensing module be connected with this main control module, communication module and printing electromechanical module, described main control module comprises asic chip, it is characterized in that: also comprise the needle type printer printing head protection circuit had described in any one of claim 1-3.
5. printer as claimed in claim 4, it is characterized in that, described sensing module comprises paper to level sensor, trimming sensor, temperature sensor, printhead border sensor and print head sensor.
6. the deposit book printers of the continuous form feeding device of band as claimed in claim 4, it is characterized in that, described printing electromechanical module comprises the word vehicle motor, chart drive motor and the contraposition motor that are connected with asic chip by motor driver, and the printhead be connected with asic chip.
7. the deposit book printers of the continuous form feeding device of band as claimed in claim 4, it is characterized in that, described communication module comprises the serial port, LPT and the USB port that are connected with asic chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110434788.3A CN102529458B (en) | 2011-12-22 | 2011-12-22 | Stylus printer printing head guard circuit and printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110434788.3A CN102529458B (en) | 2011-12-22 | 2011-12-22 | Stylus printer printing head guard circuit and printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102529458A CN102529458A (en) | 2012-07-04 |
| CN102529458B true CN102529458B (en) | 2015-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110434788.3A Active CN102529458B (en) | 2011-12-22 | 2011-12-22 | Stylus printer printing head guard circuit and printer |
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| CN (1) | CN102529458B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6763298B2 (en) * | 2016-12-27 | 2020-09-30 | セイコーエプソン株式会社 | printer |
| CN108032636A (en) * | 2017-12-28 | 2018-05-15 | 深圳市联云计算机科技有限公司 | The miniature stylus printer and its driving method of a kind of linux system |
Citations (4)
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|---|---|---|---|---|
| US6325481B1 (en) * | 1999-08-13 | 2001-12-04 | Hewlett-Packard Company | Method and apparatus for pen temperature control in a thermal printer |
| US6769755B2 (en) * | 2002-03-22 | 2004-08-03 | Canon Kabushiki Kaisha | Ink jet printing method and ink jet printing apparatus |
| US7575292B2 (en) * | 2000-08-31 | 2009-08-18 | Canon Kabushiki Kaisha | Printhead having digital circuit and analog circuit, and printing apparatus using the same |
| CN202412951U (en) * | 2011-12-22 | 2012-09-05 | 深圳中航信息科技产业股份有限公司 | Protective circuit for printing head of dot matrix printer and printer thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3768890B2 (en) * | 2002-01-31 | 2006-04-19 | キヤノン株式会社 | Recording apparatus and voltage control method |
| US7547087B2 (en) * | 2007-02-23 | 2009-06-16 | International Business Machines Corporation | Fault detection circuit for printers with multiple print heads |
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2011
- 2011-12-22 CN CN201110434788.3A patent/CN102529458B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6325481B1 (en) * | 1999-08-13 | 2001-12-04 | Hewlett-Packard Company | Method and apparatus for pen temperature control in a thermal printer |
| US7575292B2 (en) * | 2000-08-31 | 2009-08-18 | Canon Kabushiki Kaisha | Printhead having digital circuit and analog circuit, and printing apparatus using the same |
| US6769755B2 (en) * | 2002-03-22 | 2004-08-03 | Canon Kabushiki Kaisha | Ink jet printing method and ink jet printing apparatus |
| CN202412951U (en) * | 2011-12-22 | 2012-09-05 | 深圳中航信息科技产业股份有限公司 | Protective circuit for printing head of dot matrix printer and printer thereof |
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| Publication number | Publication date |
|---|---|
| CN102529458A (en) | 2012-07-04 |
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Address after: 518000 workshop 301-2 and 302, building 1, Shenzhen Software Park, Central District, high tech Zone, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen AVIC Information Industry Group Co., Ltd Address before: 518057 floor 3, building 1, Shenzhen Software Park, No. 2, Gaoxin Zhongsan Road, Nanshan High tech Zone, Shenzhen, Guangdong Patentee before: Shenzhen AVIC Information Technology Industry Co., Ltd |
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