CN201070879Y - Protecting equipment for printing head - Google Patents
Protecting equipment for printing head Download PDFInfo
- Publication number
- CN201070879Y CN201070879Y CNU2007201048982U CN200720104898U CN201070879Y CN 201070879 Y CN201070879 Y CN 201070879Y CN U2007201048982 U CNU2007201048982 U CN U2007201048982U CN 200720104898 U CN200720104898 U CN 200720104898U CN 201070879 Y CN201070879 Y CN 201070879Y
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- China
- Prior art keywords
- print head
- printhead
- printer
- utility
- overcurrent
- 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 - Lifetime
Links
- 230000001012 protector Effects 0.000 claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Abstract
The utility model provides a print head protective device, comprising a print head. The utility model is characterized in that the print head is provided with an overheat protector in electric connection with a main control panel of a printer, and a ground return of the print head is provided with an overcurrent protector in electric connection with the main control panel of the printer. The utility model effectively overcomes the shortcoming of the print head being burnt due to the overlarge printing load in a short time and the increased temperature, overcomes the shortcoming of a print head coil being burnt due to the overcurrent at the same time, reduces the consumption of the print head in the printing process, prolongs the maintenance cycle and improves the printing efficiency, thereby prolonging the service life of both the print head and the whole printer and lowering the operating cost of a user to use a stylus printer. The utility model has high reliability, good stability and excellent protection ability, can real time monitor the temperature of the print head and the overcurrent, and provide good protection for the print head.
Description
Technical field
The utility model relates to a kind of protective device, and especially a kind of device that the printhead of impact printer is protected belongs to printer electronics components and parts technical field.
Background technology
At present, the printhead of known impact printer is very important parts, and its price is valuable, and the maintenance cost height 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 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, make the content that to beat on medium, mistake is got to and is 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
Easily burn printhead in order to overcome the lasting printing that existing impact printer exists, lack paper and print the damage printhead, printhead coil overcurrent and burn deficiency such as coil, the utility model provides a kind of printhead protective device.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of printhead protective device; comprise printhead; it is characterized in that the overheat protector that is electrically connected with the printer master control borad is set on printhead, the overcurrent protector that is electrically connected with the printer master control borad is set on the earth-return of printhead.Overheated to avoid printing, print overcurrent and the problem of burning printhead.
Described overheat protector is by temperature sensor; the resistance, the electric capacity that are electrically connected with temperature sensor by the printer cable socket constitute; resistance, electric capacity link to each other with the AD passage of printer master control borad; when surpassing safety value with convenient printhead temperature; stop to print by master control borad, avoid temperature to continue to raise.
Described overcurrent protector is made of the driving chip that is electrically connected with the printer master control borad, FET, current sense resistance, voltage comparator; wherein; the input that drives chip links to each other with printer master control borad output; the output that drives chip links to each other with the FET input; the FET output links to each other with current sense resistance and voltage comparator; so that when overcurrent,, guarantee that the printhead coil is not burnt by the driving of voltage comparator notice master control borad interruption to printhead.
The utility model compared with prior art has following advantage and effect: adopt such scheme, can effectively overcome deficiency excessive because of print load in the short time, that temperature raises and burns printhead, overcome overcurrent simultaneously and to cause that the printhead coil burns etc. not enough, 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 height, good stability, protectiveness is strong, can monitor printhead temperature, overcurrent condition in real time, and printhead is effectively protected.
Description of drawings
Fig. 1 is an overheating protection circuit structure chart of the present utility model;
Fig. 2 is a current foldback circuit schematic diagram of the present utility model.
Among Fig. 1,1-ST printer socket, 2-printhead temperature sensor output signal, 3-current-limiting resistance, 4-power supply, 5-IPHPTC printhead temperature output signal, 6-filter resistance, 7-filter capacitor.
Among Fig. 2, the printhead cluster loop current monitoring control PHTST signal of 8-main control chip output, 9-MC34151 drives chip, 10-IFR1503S FET, the 11-SOLGND printhead cluster loop signal of enclosing the land, 12-2.5V power supply, 13-current sense resistance, 14-PHREF0 current monitoring are with reference to control signal, and the 15-PHREF1 current monitoring is with reference to control signal, the 16-LM339 voltage comparator, 17-PHCURR printhead current monitoring consequential signal.
The specific embodiment
The embodiment that provides below in conjunction with accompanying drawing is described further the utility model.
In the embodiment shown in fig. 1, printhead temperature signal 2 is by 1 output of printer cable socket, after current-limiting resistance 3 reinforcement drivings, behind the RC filter network through resistance 6 and electric capacity 7 compositions, receive the AD passage of main control chip, with analog signal conversion is 0～1023 data signal, makes main control chip can monitor the temperature of printhead accurately.When printhead temperature surpassed safety value, main control chip stopped printhead and goes out pin, avoided printhead temperature to continue to raise.
In example shown in Figure 2, the printhead cluster loop current monitoring control PHTST signal 8 of main control chip output drives the conducting or the shutoff of chip 9 control IFR1503S FETs 10 by MC34151.If 10 conductings of IFR1503S FET, printhead cluster loop SOLGND signal 11 ground connection of enclosing the land then, the reverse input end of LM339 voltage comparator 16 is a low level.If IFR1503S FET 10 turn-offs, then printhead cluster is enclosed the land loop SOLGND signal 11 by current sense resistance 13 ground connection, when the printhead coil had drive current, this drive current was big, so the reverse input end of LM339 voltage comparator 16 is a high level.Are low level or high level different with the PHREF1 current monitoring with reference to control signal 15 with reference to control signal 14 according to the PHREF0 current monitoring, can set the size that threshold values is monitored the printhead cluster loop current.When coil current surpasses threshold values, LM339 voltage comparator 16 can output low levels be notified the generation of main control chip overcurrent, and main control chip can interrupt the driving control to printhead, guarantees that the printhead coil is not burnt, thereby the printhead overcurrent protection is provided.
Claims (3)
1. a printhead protective device comprises printhead, it is characterized in that the overheat protector that is electrically connected with the printer master control borad is set on printhead, and the overcurrent protector that is electrically connected with the printer master control borad is set on the earth-return of printhead.
2. printhead protective device according to claim 1; it is characterized in that described overheat protector is by temperature sensor; the resistance, the electric capacity that are electrically connected with temperature sensor by the printer cable socket constitute, and resistance, electric capacity link to each other with the AD passage of printer master control borad.
3. described overcurrent protector is made of the driving chip that is electrically connected with the printer master control borad, FET, current sense resistance, voltage comparator; wherein; the input that drives chip links to each other with printer master control borad output; the output that drives chip links to each other with the FET input, and the FET output links to each other with current sense resistance and voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201048982U CN201070879Y (en) | 2007-08-17 | 2007-08-17 | Protecting equipment for printing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201048982U CN201070879Y (en) | 2007-08-17 | 2007-08-17 | Protecting equipment for printing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201070879Y true CN201070879Y (en) | 2008-06-11 |
Family
ID=39549438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201048982U Expired - Lifetime CN201070879Y (en) | 2007-08-17 | 2007-08-17 | Protecting equipment for printing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201070879Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103009830A (en) * | 2011-09-22 | 2013-04-03 | 富士通株式会社 | Printer and medium for storing printing control program |
| CN103770480A (en) * | 2012-10-17 | 2014-05-07 | 普印力公司 | Preventing coil overheating in line printer hammer bank |
| CN105249960A (en) * | 2015-09-28 | 2016-01-20 | 康泰医学系统（秦皇岛）股份有限公司 | Protection circuit and method for thermal printing of electrocardiograph |
| CN107703787A (en) * | 2017-08-17 | 2018-02-16 | 武汉朋谊科技有限公司 | Digital printing apparatus fault control method based on big data |
-
2007
- 2007-08-17 CN CNU2007201048982U patent/CN201070879Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103009830A (en) * | 2011-09-22 | 2013-04-03 | 富士通株式会社 | Printer and medium for storing printing control program |
| CN103009830B (en) * | 2011-09-22 | 2015-09-09 | 富士通株式会社 | Printer and for controlling the method for the printer printed on the print medium |
| CN103770480A (en) * | 2012-10-17 | 2014-05-07 | 普印力公司 | Preventing coil overheating in line printer hammer bank |
| CN105249960A (en) * | 2015-09-28 | 2016-01-20 | 康泰医学系统（秦皇岛）股份有限公司 | Protection circuit and method for thermal printing of electrocardiograph |
| CN105249960B (en) * | 2015-09-28 | 2017-12-08 | 康泰医学系统（秦皇岛）股份有限公司 | A kind of electrocardiograph thermal print protection circuit and method |
| CN107703787A (en) * | 2017-08-17 | 2018-02-16 | 武汉朋谊科技有限公司 | Digital printing apparatus fault control method based on big data |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090116 Address after: No. 455, East Ring Road, Panlong District, Yunnan City, Kunming Province, China: 650041 Co-patentee after: Beijing Nantian Electronics Information Co., Ltd. Patentee after: Yunnan Nantian electronic Chengdu Westone Information Industry Inc Address before: No. 455, East Ring Road, Panlong District, Yunnan City, Kunming Province, China: 650041 Patentee before: Yunnan Nantian Electronic Information Industry Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20080611 |
|
| CX01 | Expiry of patent term |