CN103257557B - Heating roller control apparatus - Google Patents
Heating roller control apparatus Download PDFInfo
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- CN103257557B CN103257557B CN201210038777.8A CN201210038777A CN103257557B CN 103257557 B CN103257557 B CN 103257557B CN 201210038777 A CN201210038777 A CN 201210038777A CN 103257557 B CN103257557 B CN 103257557B
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Abstract
The invention provides a heating roller control apparatus used for controlling the heating of a power supply unit to the heating roller of a fixing unit. The fixing unit comprises a temperature sensor for detecting the temperature value of the heating roller. The heating roller control apparatus comprises: an abnormity determining unit which receives the temperature value detected by the temperature sensor and outputs an abnormal signal when the temperature value is not less than a predetermined threshold T1; a sampling signal generating unit which is independent of the power supply unit and is used for generating a sampling signal; a maintaining unit which receives the abnormal signal output from the abnormity determining unit and outputs the abnormal signal and maintains when the sampling signal is received; and a power supply control unit which cuts off the power supply of the power supply unit to the heating roller when the abnormal signal emitted by the maintaining unit is received in order to stop heating of the heating roller. The heating roller control apparatus can reduce the making cost of whole image forming equipment.
Description
Technical field
The present invention relates to a kind of warm-up mill control device, particularly relating to a kind of control device of the heating for controlling warm-up mill.
Background technology
For the image forming apparatus such as printer and duplicating machine, fixation unit is wherein in the process utilizing thermal treatment toner image to be fixed on the recording mediums such as paper, need to control the temperature of the warm-up mill in fixation unit, in order to avoid warm-up mill is overheated, damage is caused to fixation unit, cause whole image forming apparatus to sustain damage, such as, make image forming apparatus temperature distortion, smolder, even burn etc.
In the prior art, by CPU etc., temperature is monitored, and the temperature of the warm-up mill detected according to temperature sensor is carried out the adjustment of corresponding temperature to warm-up mill and is controlled.If in control procedure, find that the temperature anomaly detected raises, then the heating of unit to warm-up mill of cutting off the electricity supply is powered.
In addition, consider the situation of the software anomalys such as CPU, except by except the software control of CPU etc., as safety practice, also cut off the control to warm-up mill by force by hardware circuit.Such hardware circuit is made up of comparer (that is, comparing unit) and latch (that is, holding unit) usually.Comparer compares from the voltage U of temperature sensor and predetermined abnormal reference voltage U1; wherein, the voltage U of temperature sensor corresponds to the temperature T of the warm-up mill that temperature sensor detects, abnormal reference voltage U1 corresponds to threshold value T1; when temperature T rises, voltage U declines.If voltage U is less than or equal to predetermined abnormal reference voltage U1 (that is, the temperature T of warm-up mill is more than or equal to predetermined threshold value T1), so comparer will output abnormality signal.
Latch is made up of d type flip flop, the input end (D end) of d type flip flop receives the abnormal signal of comparer output, and when the clock end (CLK end) of d type flip flop receives the rising edge signal as sampled signal, its output terminal (Q end) exports this abnormal signal, and this abnormal signal is latched (maintenance), thus to be cut off the electricity supply the power supply of unit to warm-up mill by follow-up power control unit, to stop the heating to warm-up mill.
In prior art, sampled signal (zero cross signal) produced by power supply unit, for this reason, in power supply unit, just corresponding components and parts must be set, such as, optocoupler, triode, rectifier and resistance and electric capacity etc., arrange the complex structure that these components and parts can cause power supply unit undoubtedly, and manufacturing cost increases, thus causes the manufacturing cost of whole image forming apparatus to increase.
Summary of the invention
In view of the problem of above-mentioned proposition, the present invention aims to provide a kind of warm-up mill control device that can reduce the manufacturing cost of whole image forming apparatus.
According to an aspect of the present invention, a kind of warm-up mill control device is provided, for controlling the heating of power supply unit to the warm-up mill of fixation unit, this fixation unit comprises the temperature sensor of the temperature value detecting this warm-up mill, this warm-up mill control device comprises: abnormal deciding means, it receives this temperature value that this temperature sensor detects, when this temperature value is more than or equal to predetermined threshold value T1, and output abnormality signal; Independent of the sampled signal generation unit outside this power supply unit, for generation of sampled signal; Holding unit, receives this abnormal signal exported from this abnormal deciding means, and when receiving this sampled signal, exporting this abnormal signal and keeping; Power control unit, when receiving this abnormal signal that this holding unit sends, cuts off the power supply of this power supply unit to this warm-up mill, to stop the heating to this warm-up mill.
This holding unit comprises at least one d type flip flop, the input end of this d type flip flop receives this abnormal signal exported from this abnormal deciding means, and when the clock termination of this d type flip flop receives this sampled signal, the output terminal of this d type flip flop exports this abnormal signal and keeps.
This power control unit comprises at least one and door, should be connected with an input end of door with this output terminal of this d type flip flop, should be connected with the output terminal of door with this power supply unit.
This sampled signal generation unit receives this temperature value that this temperature sensor detects, when this temperature value is more than or equal to predetermined sampling threshold T2, produce this sampled signal, wherein, this threshold value T1 is less than this sampling threshold T2, and this sampling threshold T2 can not cause damage to this fixation unit.
This sampled signal generation unit comprises: comparing unit, and this temperature value and this sampling threshold T2 compare by this comparing unit, and when this temperature value is more than or equal to this sampling threshold T2, produces this sampled signal.
This sampled signal generation unit is the CPU not controlling this power supply unit.
This sampled signal generation unit comprises: oscillator, and this oscillator produces sine wave signal; Trigger, this trigger carries out shaping to this sine wave signal, thus produces this sampled signal.
This sampled signal square-wave signal.
The present invention also provides a kind of image forming apparatus, comprises warm-up mill control device as above.
In the present invention, without the need to arranging the components and parts producing sampled signal in power supply unit, but utilize sampled signal generation unit in the present invention to produce sampled signal, so, the structure of power supply unit can be made simple, manufacturing cost reduces, thus the manufacturing cost of whole image forming apparatus is reduced.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of warm-up mill control device according to an embodiment of the invention;
Fig. 2 is the circuit diagram of the warm-up mill control device according to the first embodiment of the present invention;
Fig. 3 is according to the time dependent constitutional diagram of coherent signal in the warm-up mill control device of the first embodiment of the present invention;
Fig. 4 is the circuit diagram of warm-up mill control device according to a second embodiment of the present invention;
Fig. 5 according to of the present invention second and the 3rd embodiment warm-up mill control device in the time dependent constitutional diagram of coherent signal;
Fig. 6 is the circuit diagram of warm-up mill control device according to the third embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
Warm-up mill control device of the present invention is used in image forming apparatus.When the CPU (figure do not look) controlling power supply unit 12 occurs abnormal, powered by the warm-up mill control device of the present invention heating of unit to warm-up mill of cutting off the electricity supply.
As shown in Figure 1, warm-up mill control device 11 of the present invention is for controlling the heating of the warm-up mill 102 of power supply unit 12 pairs of fixation units 10, fixation unit 10 comprises the temperature sensor 101 of the temperature value T detecting warm-up mill 102, this warm-up mill control device 11 comprises: abnormal deciding means 111, it receives the temperature value T that temperature sensor 101 detects, when temperature value T is more than or equal to predetermined threshold value T1, output abnormality signal L; Independent of the sampled signal generation unit 114 outside power supply unit 12, for generation of sampled signal; Holding unit 112, receive the abnormal signal L exported from abnormal deciding means 111, and when receiving sampled signal, output abnormality signal L also keeps; Power control unit 113, when receiving the abnormal signal L that holding unit 112 sends, the power supply of unit 12 pairs of warm-up mills 102 of cutting off the electricity supply, to stop the heating to warm-up mill 102.
See Fig. 2, the physical circuit figure of diagram warm-up mill control device 11 according to a first embodiment of the present invention.Wherein, abnormal deciding means 111 is specially comparer 111, and holding unit 112 is specially two d type flip flop 112a and 112b.Temperature sensor 101 detects the temperature T of warm-up mill 102, and the voltage U corresponding with this temperature T-phase is input to "+" input end of comparer 111, and "-" input end of comparer 111 is connected with abnormal reference voltage U1.When power source voltage Vcc and resistance R0 constant, due to the characteristic of the thermal resistance (figure do not look) in temperature sensor 101, along with temperature T rises, voltage U declines.If voltage U is less than or equal to predetermined abnormal reference voltage U1 (that is, the temperature T of warm-up mill is more than or equal to predetermined threshold value T1), so comparer 111 will output low level L, that is, abnormal signal L.
In this example, such as predetermined threshold value T1 is 220 DEG C, then corresponding abnormal reference voltage U1 is set to 0.8V.When software anomalys such as CPU, power supply unit 12 continues to heat warm-up mill 102, causes the temperature T of warm-up mill 102 to continue to rise, when temperature T is more than or equal to 220 DEG C, that is, when voltage U is less than or equal to 0.8V, and comparer 111 output low level L.
Sampled signal generation unit 114 receives the temperature T that temperature sensor 101 detects, when temperature T is more than or equal to predetermined sampling threshold T2, produces sampled signal B.Wherein, threshold value T1 is less than sampling threshold T2, and sampling threshold T2 can not cause damage by 2 pairs of fixation units 10, thus guarantees that whole image forming apparatus is injury-free.
Sampled signal generation unit 114 comprises comparing unit 1141, and comparing unit 1141 receives the temperature T that temperature sensor 101 detects, is compared by temperature T and sampling threshold T2, and when temperature value T is more than or equal to sampling threshold T2, produces sampled signal B.
In this example, comparing unit 1141 is such as comparer 1141, and "-" input end of this comparer 1141 is connected with the voltage U of temperature sensor 101, and "+" input end is connected with reference voltage U2.Wherein, sampling threshold T2 is slightly higher than threshold value T1, such as, be 225 DEG C, guarantees to cause damage to fixation unit 10 simultaneously.Sampling threshold T2 is 225 DEG C, and corresponding reference voltage U2 is such as set to 0.7V.When temperature T is less than sampling threshold 225 DEG C, that is, when voltage U is greater than reference voltage 0.7V, comparer 1141 output low level, and when temperature T is more than or equal to sampling threshold 225 DEG C, that is, when voltage U is less than or equal to reference voltage 0.7V, comparer 1141 exports high level, now, produce rising edge signal, that is, a sampled signal B.
Here, the ceiling temperature of sampling threshold T2 is the temperature guaranteeing to cause fixation unit 10 damage, and the lower limit temperature of sampling threshold T2 is greater than the reaction time of d type flip flop 112a corresponding to the time rising to sampling threshold T2 from threshold value T1.That is, the time rising to sampling threshold T2 from threshold value T1 is greater than reaction time of d type flip flop 112a, to guarantee d type flip flop 112a normal transmission low level L.
Sampled signal generation unit 114 also comprises bleeder circuit 1142, and bleeder circuit 1142 comprises divider resistance R3, R4 of series connection.As shown in Figure 2, set reference voltage U1 by power source voltage Vcc and divider resistance R1, R2, and set reference voltage U2 by power source voltage Vcc and divider resistance R3, R4.
Holding unit 112 comprises at least one d type flip flop, in this example, comprise two d type flip flops 112a, 112b, the input end (D end) of d type flip flop 112a is connected with the output terminal of comparer 111, the clock end (CLK end) of d type flip flop 112a is connected with the output terminal of comparer 1141, the output terminal (Q end) of d type flip flop 112a is connected with the set end (PRE holds) of d type flip flop 112b, output terminal (Q end) and being connected with an input end of door 113 of describing after a while of d type flip flop 112b.In addition, as shown in Figure 2, the reset terminal (S end) of d type flip flop 112a is connected with reset circuit, its set end (PRE end) is connected with power source voltage Vcc, the reset terminal (S end) of d type flip flop 112b is connected with power source voltage Vcc, and the clock end of d type flip flop 112b (CLK end) is connected with reset circuit.
The input end (D end) of d type flip flop 112a receives the abnormal signal L exported from comparer 111, and receive sampled signal B (namely at the clock end (CLK end) of d type flip flop 112a, rising edge signal) time, abnormal signal L is transferred to the output terminal (Q end) of d type flip flop 112b from the input end (D end) of d type flip flop 112a, thus output abnormality signal L keeping.Here, due to the known characteristic of d type flip flop, the output terminal output abnormality signal L all the time of d type flip flop 112b.In addition, the concrete connection of two d type flip flops 112a, 112b in holding unit 112 is the same with of the prior art with the principle of work of latch, therefore detailed.
Power control unit 113 comprises at least one and door, in this example, comprises one and door 113, should be connected, and be connected with the output terminal of door 113 with power supply unit 12 with an input end of door 113 with the output terminal (Q holds) of d type flip flop 112b.In addition, be connected with the CPU (scheme depending on) controlling power supply unit 12 with another input end M of door 113.When this CPU occurs abnormal, when the temperature anomaly height of warm-up mill, power supply unit 12 can not cut off by CPU, but exports high level H all the time, that is, with another input end M input high level H all the time of door 113.So, as output terminal output abnormality signal L (that is, the low level L) of d type flip flop 112b, with the output terminal output low level of door 113, thus the switch (figure does not look) of power supply unit 12 is cut off, to stop the heating to warm-up mill 102.
Fig. 3 is according to the time dependent constitutional diagram of coherent signal in the warm-up mill control device of the first embodiment of the present invention, as shown in Figure 3, along with the temperature of warm-up mill 102 rises, the voltage U of temperature sensor declines, when voltage U is less than or equal to reference voltage U1, the output terminal output low level L of comparer 111.Along with the constant temperature of warm-up mill 102 rises, the voltage U continuous decrease of temperature sensor, such as, at moment t1, voltage U is less than or equal to reference voltage U2, and the sampled signal B that the output terminal of comparer 1141 exports just becomes high level from low level, that is, a rising edge signal is produced.Now, the output terminal (Q end) of d type flip flop 112b with regard to output low level L, and keeps this low level L.That is, whether the temperature regardless of warm-up mill 102 declines, and the output terminal of d type flip flop 112b remains low level L, namely, low level L is latched, thus by the power supply of follow-up unit 12 pairs of warm-up mills 102 of cutting off the electricity supply with door 113, to stop the heating to warm-up mill 102.Sampled signal B is square-wave signal.
Owing to producing the components and parts of sampled signal without the need to arranging in power supply unit 12, therefore the structure of power supply unit 12 is simple, and manufacturing cost reduces.Although be provided with sampled signal generation unit 114 in warm-up mill control device 11, as above describe known, this sampled signal generation unit 114 is also simple by structure and the comparer 1141 of low cost and divider resistance R3, R4 are formed.Therefore, with arrange in power supply unit 12 produce sampled signal components and parts compared with, structure is more simple, and cost also reduces.So, the manufacturing cost of whole image forming apparatus also reduces.
See the circuit diagram that Fig. 4, Fig. 4 are warm-up mill control device according to a second embodiment of the present invention.Wherein, the part identical with the first embodiment is omitted and is described, and only describes the part different from the first embodiment.
In this example, sampled signal generation unit is such as the CPU 40 not controlling power supply unit 12.This CPU 40 is the control modules carrying out image procossing etc. in image forming apparatus.In the present invention, utilize CPU 40 to produce sampled signal C, as shown in Figure 5, this sampled signal C is square-wave signal, and frequency is such as 50Hz.CPU 40 is connected with the clock end (CLK holds) of d type flip flop 112a, and the square-wave signal for producing inputs the clock end (CLK end) of d type flip flop 112a.
Fig. 5 is the time dependent constitutional diagram of coherent signal in warm-up mill control device according to a second embodiment of the present invention, as shown in Figure 5, along with the temperature of warm-up mill 102 rises, the voltage U of temperature sensor declines, when voltage U is less than or equal to reference voltage U1, the output terminal output low level L (that is, abnormal signal) of comparer 111.Afterwards, at moment t1, occur rising edge in sampled signal C, so low level L is just transferred to output terminal (Q) end of d type flip flop 112b from the D of d type flip flop 112a end, thus output low level L, and this low level L is kept.Whether the temperature regardless of warm-up mill 102 declines, the output terminal of d type flip flop 112b remains low level L, that is, latch low level L, thus by the power supply of follow-up unit 12 pairs of warm-up mills 102 of cutting off the electricity supply with door 113, to stop the heating to warm-up mill 102.
In the present embodiment, without the need to arranging the components and parts producing sampled signal in power supply unit 12, meanwhile, sampled signal generation unit is original CPU 40 in image forming apparatus, that is, in warm-up mill control device 11, do not increase any components and parts.Therefore, compared with the first embodiment, the manufacturing cost of whole image forming apparatus reduces further.
Fig. 6 is the circuit diagram of warm-up mill control device according to the third embodiment of the invention.Wherein, the part identical with the first embodiment is omitted and is described, and only describes the part different from the first embodiment.
In this example, sampled signal generation unit such as comprises: oscillator 61 and trigger 62, and oscillator 61 produces sine wave signal, and trigger 62 offset of sinusoidal ripple signal carries out shaping, thus produces the sampled signal of square-wave-shaped.Oscillator 61 is such as sine-wave oscillator, such as, produce the sine wave of 50Hz.The input end of sine-wave oscillator 61 is connected with power source voltage Vcc, and the output terminal of sine-wave oscillator 61 is connected with the input end of trigger 62, and the output terminal of trigger 62 is connected with the clock end (CLK holds) of d type flip flop 112a.
Trigger 62 offset of sinusoidal ripple signal carries out shaping, and produce sampled signal, this sampled signal C is such as the square-wave signal of 50Hz, as shown in Figure 5.In this example, the time dependent state of the coherent signal in warm-up mill control device with show in Fig. 5 the same, that is, the same in the second embodiment, is therefore not described in detail.
As mentioned above, in the present invention, without the need to arranging the components and parts producing sampled signal in power supply unit, but utilize sampled signal generation unit in the present invention to produce sampled signal, so, the structure of power supply unit can be made simple, and manufacturing cost reduces, thus the manufacturing cost of whole image forming apparatus is reduced.
Although the present invention is described in conjunction with specific embodiment always, it is evident that, for a person skilled in the art, according to description above, many easy to do replacements, modifications and changes can be carried out to the present invention.Therefore, the present invention be intended to comprise drop on appended claim design and scope in all this replacement, modifications and changes.
Claims (9)
1. a warm-up mill control device, for controlling the heating of power supply unit to the warm-up mill of fixation unit, described fixation unit comprises the temperature sensor of the temperature value detecting described warm-up mill, it is characterized in that, described warm-up mill control device comprises:
Abnormal deciding means, it receives the described temperature value that described temperature sensor detects, when described temperature value is more than or equal to predetermined threshold value T1, output abnormality signal;
Independent of the sampled signal generation unit outside described power supply unit, described sampled signal generation unit receives the described temperature value that described temperature sensor detects, when described temperature value is more than or equal to predetermined sampling threshold T2, produces sampled signal;
Holding unit, receives the described abnormal signal exported from described abnormal deciding means, and when receiving described sampled signal, exporting described abnormal signal and keeping;
Power control unit, when receiving the described abnormal signal that described holding unit sends, cuts off the power supply of described power supply unit to described warm-up mill, to stop the heating to described warm-up mill;
Wherein, described threshold value T1 is less than described sampling threshold T2.
2. warm-up mill control device as claimed in claim 1, it is characterized in that, described holding unit comprises at least one d type flip flop, the input end of described d type flip flop receives the described abnormal signal exported from described abnormal deciding means, and when the clock termination of described d type flip flop receives described sampled signal, the output terminal of described d type flip flop exports described abnormal signal and keeps.
3. warm-up mill control device as claimed in claim 2, it is characterized in that, described power control unit comprises at least one AND circuit, and an input end of described AND circuit is connected with the described output terminal of described d type flip flop, and the output terminal of described AND circuit is connected with described power supply unit.
4. warm-up mill control device as claimed in claim 3, it is characterized in that, described sampling threshold T2 can not cause damage to described fixation unit.
5. warm-up mill control device as claimed in claim 4, it is characterized in that, described sampled signal generation unit comprises:
Comparing unit, described temperature value and described sampling threshold T2 compare by described comparing unit, and when described temperature value is more than or equal to described sampling threshold T2, produce described sampled signal.
6. warm-up mill control device as claimed in claim 3, it is characterized in that, described sampled signal generation unit is the CPU not controlling described power supply unit.
7. warm-up mill control device as claimed in claim 3, it is characterized in that, described sampled signal generation unit comprises:
Oscillator, described oscillator produces sine wave signal;
Trigger, described trigger carries out shaping to described sine wave signal, thus produces described sampled signal.
8. the warm-up mill control device according to any one of claim 1-7, is characterized in that, described sampled signal square-wave signal.
9. an image forming apparatus, is characterized in that, comprises the warm-up mill control device according to any one of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210038777.8A CN103257557B (en) | 2012-02-20 | 2012-02-20 | Heating roller control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210038777.8A CN103257557B (en) | 2012-02-20 | 2012-02-20 | Heating roller control apparatus |
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| CN103257557A CN103257557A (en) | 2013-08-21 |
| CN103257557B true CN103257557B (en) | 2015-07-22 |
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| CN201210038777.8A Active CN103257557B (en) | 2012-02-20 | 2012-02-20 | Heating roller control apparatus |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102267763B1 (en) | 2014-03-19 | 2021-06-23 | 캐논 가부시끼가이샤 | Image heating apparatus and heater for use therein |
| CN109901367B (en) * | 2014-03-19 | 2022-05-17 | 佳能株式会社 | Image heating apparatus and heater used therein |
| JP6589789B2 (en) * | 2016-09-21 | 2019-10-16 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| WO2019065446A1 (en) * | 2017-09-29 | 2019-04-04 | 京セラドキュメントソリューションズ株式会社 | Fixing device |
| CN109240053B (en) * | 2018-11-16 | 2021-09-07 | 珠海奔图电子有限公司 | Power supply control apparatus, method and image forming apparatus |
| CN110275404A (en) * | 2019-07-12 | 2019-09-24 | 无锡市天彩包装印刷有限公司 | A kind of POD digital printing process based on technology of Internet of things |
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| CN101051204A (en) * | 2006-04-03 | 2007-10-10 | 三星电子株式会社 | System and method of controlling temperature of fixing unit |
| CN101055459A (en) * | 2006-04-12 | 2007-10-17 | 株式会社东芝 | Image forming apparatus |
| CN102117037A (en) * | 2010-01-05 | 2011-07-06 | 株式会社理光 | Heating device and abnormality judging method thereof, fixing device and image forming device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051204A (en) * | 2006-04-03 | 2007-10-10 | 三星电子株式会社 | System and method of controlling temperature of fixing unit |
| CN101055459A (en) * | 2006-04-12 | 2007-10-17 | 株式会社东芝 | Image forming apparatus |
| CN102117037A (en) * | 2010-01-05 | 2011-07-06 | 株式会社理光 | Heating device and abnormality judging method thereof, fixing device and image forming device |
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