CN102508417B - Laser printer and modification method thereof - Google Patents

Laser printer and modification method thereof Download PDF

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Publication number
CN102508417B
CN102508417B CN201110364123.XA CN201110364123A CN102508417B CN 102508417 B CN102508417 B CN 102508417B CN 201110364123 A CN201110364123 A CN 201110364123A CN 102508417 B CN102508417 B CN 102508417B
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China
Prior art keywords
laser printer
electric contact
rectification module
electrically connected
contact
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CN102508417A (en
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苏健强
汪继忠
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Print Rite Unicorn Image Products Co Ltd
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Print Rite Unicorn Image Products Co Ltd
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Priority to CN201110364123.XA priority Critical patent/CN102508417B/en
Publication of CN102508417A publication Critical patent/CN102508417A/en
Priority to PCT/CN2012/084534 priority patent/WO2013071853A1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/80—Details relating to power supplies, circuits boards, electrical connections
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1642—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements for connecting the different parts of the apparatus
    • G03G21/1652—Electrical connection means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
    • G03G21/1676—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the developer unit

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

The invention provides a laser printer and a modification method thereof. The laser printer is provided with a casing, a cavity is surrounded by the casing, an electric contact used for inputting development bias voltage is arranged on the inner surface of the cavity, a circuit board is mounted in the casing, a power supply circuit is arranged on the circuit board, and a power supply module is used for outputting development bias voltage to the electric contact, wherein the power supply circuit is further provided with a rectification module, which receives electric signals output by the power supply module and is provided with an output end electrically connected with the electric contact. The method for modifying the existing laser printer to the printer with the structure includes steps as follows: the electrical connection between the output end of the power supply circuit and the electric contact is cut off, the rectification module which receives the electric signals output by the power supply module is arranged on the power supply circuit, and the output end of the rectification module is electrically connected with the electric contact. The laser printer provided by the invention can meet the contact existing work requirements, the printing cost is lowered, and the laser printer is convenient for a user to modify and use at the user's discretion.

Description

Laser printer and method of modifying thereof
Technical field
The present invention relates to electronic imaging device field, especially relate to a kind of laser printer and existing laser printer is repacked into the method for this laser printer.
Background technology
Laser printer is a kind of common printer, for modern office provides great convenience.Referring to Fig. 1 and Fig. 2, existing laser printer has housing 10, and housing 10 comprises upper cover 11 and end cap 12, and housing 10 surrounds a cavity 13, and the inside surface of cavity 13 is provided with electric contact (invisible in Fig. 2).The circuit board 14 that laser printer is installed in the inner side of end cap 12, circuit board 14 is provided with control circuit, the feed circuit etc. of laser printer.And, handle box is removably installed in cavity 13, the structural drawing of handle box is as shown in Figure 3.
Existing handle box 20 has a housing 21, and housing 21 is provided with a handle 22, is convenient to user and holds.Referring to Fig. 4, the housing 21 of handle box 20 is made up of drum frame 23, carbon dust chamber framework 24 and two end caps 25,26, and wherein handle 22 is positioned on drum frame 23.Carbon dust chamber framework 24 has one for holding the carbon dust chamber of carbon dust, is provided with powder feeding roller 31, developer roll 32, powder outlet cutter 41 outside carbon dust chamber.
Drum frame 23 has a useless powder chamber, and for holding waste and old carbon dust, useless powder chamber peripheral hardware has photosensitive drums 42, charging roller 43 and cleaning doctor 44.When handle box assembling, drum frame 23 is connected and fixed by the end cap 25,26 of both sides with carbon dust chamber framework 24, and drum frame 23, carbon dust chamber framework 24 and end cap 25,26 surround a cavity, and the parts such as powder feeding roller 31, developer roll 32, powder outlet cutter 41, photosensitive drums 42, charging roller 43 and cleaning doctor 44 are positioned at this cavity.
Developer roll 32 has a metal mandrel 33, and mandrel 33 is wrapped with elastic layer 34, and as sponge, rubber etc., one end of mandrel 33 is connected with conducting strip 35, and conducting strip 35 outer ends extend to outside end cap 26.Conducting strip 35 contacts with the electric contact in laser printer cavity, thereby realizes being electrically connected of conducting strip 35 and electric contact.And conducting strip 35 receives the voltage from the supply of laser printer, this voltage is called development bias voltage.When handle box 20 is worked, the outside surface of developer roll 32 and carbon dust, by electrostatic interaction, are adsorbed on carbon dust on developer roll 32 outside surfaces.
The carbon dust of developer roll 32 outside surfaces is transferred to the outside surface of photosensitive drums 42 by electric field force.When working of laser printer, the carbon dust being contained in carbon dust chamber is supplied to developer roll 32 outside surfaces by powder feeding roller 31, when powder feeding roller 31 is worked, constantly rotates.
The abut outer surfaces of powder feeding roller 31 and developer roll 32 is therefore transferred to the carbon dust that is adsorbed on outside surface the outside surface of developer roll 32, also constantly rotation when developer roll 32 is worked in powder feeding roller 31 rotary courses.In developer roll 32 rotary courses, the unnecessary carbon dust of its outside surface, by through the striking off of powder outlet cutter 41, makes developer roll 32 outside surface carbon dust layer thicknesses even.
And charging roller 43 charges to photosensitive drums 42, make photosensitive drums 42 outside surfaces electronegative equably.When working of laser printer, laser instrument is the laser with image information to photosensitive drums 42 surface irradiations, and this process is exposure process, forms latent image in the surperficial irradiated region of photosensitive drums 42, and exposure area electric charge disappears, and is electric neutrality.
Because unexposed area in photosensitive drums 42 is electronegative, and exposure area is electric neutrality, and the carbon dust of developer roll 32 outside surfaces is also electronegative, according to electric charge in electric field principle, the carbon dust of developer roll 32 outside surfaces, by under the effect of electric field force, move to exposure area in photosensitive drums 42 by developer roll 32 outside surfaces.And, due to the electric field force in territory, non-exposed area higher than development bias voltage, therefore the carbon dust of developer roll 32 outside surfaces can not move to the territory, non-exposed area of photosensitive drums 42 outside surfaces, this process is developing process.
Finally, as the paper of print media, from photosensitive drums 42 below processes, carbon dust will be transferred on paper, and carbon dust is fixed on paper after heating, and print job completes.
Photosensitive drums 42 completes after transfer process, and cleaning doctor 44 will strike off the carbon dust that remains in photosensitive drums 42 outside surfaces, and useless pruinescence is collected and entered useless powder chamber, avoids affecting next print job cycle of photosensitive drums.
Existing laser printer is divided by its visualization way, can be divided into contact type developing and contactless development, and wherein contactless development is also referred to as great-jump-forward development, and the surface of developer roll 32 does not contact with the surface of photosensitive drums 42, but has certain distance.The development bias voltage that applying the laser printer of this visualization way provides to developer roll 32 is the alternating current with DC component.
Referring to Fig. 5, the laser printer feed circuit of contactless development have power module, comprise an alternating current source AC, and be provided with capacitor C 1, diode D1 and resistance R 1, R2, R3, wherein alternating current source AC one end is connected to the output terminal 48 of power module by resistance R 3, the output terminal 48 of power module is also the output terminal of feed circuit, for the electric contact output development bias voltage in cavity 13.
The anode of diode D1 is connected to output terminal 48 by resistance R 3, and negative electrode is by resistance R 2 ground connection.Visible, the AC signal of alternating current source AC output can directly be exported by output terminal 48, and B point place AC signal is while being positive half cycle, and electric current cannot be exported by diode D1, and when A point place AC signal is negative half period, electric current will export output terminal 48 to by diode D1.Therefore the development bias voltage that, output terminal 48 is exported includes AC compounent and DC component.
Under contactless development mode of operation, the development bias voltage receiving because of developer roll 32 has AC compounent, therefore the electric field force direction forming constantly changes, carbon dust is beated under the effect of magnetic field force between developer roll 32 and photosensitive drums 42 surfaces, and namely carbon dust is to jump on the surface of photosensitive drums 42 under the effect of magnetic field force.Therefore, the carbon dust amount that this visualization way often consumes is larger, prints cost higher.
Under contact type developing mode of operation, the surface adjacency of the surface of developer roll 32 and photosensitive drums 42, the development bias voltage that laser printer is exported to conducting strip 35 only comprises DC component, and this DC component is the voltage lower than 0 volt.Like this, carbon dust can not beated between developer roll 32 and photosensitive drums 42, and therefore carbon dust is directly transferred to the surface of photosensitive drums 42 under the effect of electric field force, and the carbon dust amount that this visualization way consumes is less, prints cost lower.
But because existing laser printer can only provide a kind of visualization way to user, if laser printer is contactless development, user can only use the handle box of contactless development, cause printing cost high.Therefore, notification number is that the Chinese utility model patent of CN201402372Y discloses the innovation and creation of a kind of " handle box " by name, between the developer roll of this handle box and conducting strip, be provided with rectifier, the development bias voltage rectification with AC compounent is formed and only comprises the voltage of DC component and provide developer roll to use.Like this, the handle box of contact type developing can be installed on non-contact laser printer, save and print cost.
But, on each handle box, rectifier is installed, increase the production cost of handle box, still can cause printing cost higher.And, if user reequips handle box voluntarily, repack common handle box into this handle box, in the time of each replacing handle box, reequip operation, consume a large amount of manpower and materials, be unfavorable for user's use.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of laser printer that can effectively reduce printing cost and be user-friendly to.
Another object of the present invention is to provide a kind of method that existing non-contact laser printer is repacked into contact laser printer.
For realizing above-mentioned fundamental purpose, laser printer provided by the invention comprises housing, and housing surrounds cavity, and the inside surface of cavity is provided with the electric contact for exporting development bias voltage, circuit board is installed in housing, circuit board is provided with feed circuit, and feed circuit are provided with power module, and power module is for exporting development bias voltage to electric contact, wherein, feed circuit are also provided with rectification module, and rectification module receives the electric signal of power module output, and the output terminal of rectification module is electrically connected with electric contact.
From such scheme, in the feed circuit of laser printer, be provided with rectification module, can convert the electric signal that contains AC compounent to only comprise DC component electric signal, and export electric contact to as development bias voltage, like this, even if rectifier is not set in handle box, also can be installed in laser printer and normal use, and work in contact type developing mode, can effectively reduce printing cost.In addition, because handle box is without arranging rectifier, therefore on market, the common handle box for contact type developing also can be arranged on laser printer of the present invention and use, and user is without handle box is reequiped, easy to use.
A preferred scheme is, feed circuit are also provided with double throw switch, the stiff end of double throw switch is electrically connected with power module outlet, in the normally closed contact of double throw switch and normally opened contact one is electrically connected to the input end of rectification module, and another in normally closed contact and the normally opened contact of double throw switch is electrically connected to electric contact.
As can be seen here, whether the double throw switch of feed circuit setting can select the electric signal of power module output to need to export after rectification module, if user's choice for use contact type developing work pattern, can press double throw switch, allow double throw switch select the electric signal of power module to export after rectification module, if the contactless development of user's choice for use, user allows double throw switch select the electric signal of power module output directly to export electric contact to, can allow like this user flexibility select easily the visualization way of laser printer.
Further scheme is, rectification module is also provided with voltage-stabilizing device, and voltage-stabilizing device is connected between rectifying device and ground.
Visible, voltage-stabilizing device is set on rectification module, can guarantee that the direct-flow signal voltage of rectification module output is stable, avoid the voltage fluctuation of direct current signal, thereby guarantee to be carried in the voltage constant on developer roll, the magnetic field force forming is also stable, and then guarantees that carbon dust can be transferred in photosensitive drums.
For realizing another above-mentioned object, in laser printer method of modifying provided by the invention, this laser printer comprises housing, housing surrounds cavity, the inside surface of cavity is provided with the electric contact for exporting development bias voltage, circuit board is installed in housing, circuit board is provided with feed circuit, feed circuit are provided with power module, the output terminal of feed circuit is electrically connected with electric contact, the method comprises being electrically connected between disconnection feed circuit output terminal and electric contact, the rectification module of the electric signal that receives power module output is set on feed circuit, output terminal and the electric contact of electrical connection rectification module.
From such scheme, on feed circuit, set up rectification module, can make the development bias voltage of feed circuit output be converted to the direct current that only comprises DC component by the alternating current that comprises DC component, thereby meet the need of work of contact type developing.User can be installed to the handle box of contact type developing on the laser printer after repacking, reduces and prints cost, and use also very convenient.
A preferred scheme is, disconnect after being electrically connected between feed circuit output terminal and electric contact, double throw switch is also set on feed circuit, the stiff end of double throw switch is electrically connected with power module outlet, in the normally closed contact of double throw switch and normally opened contact one is electrically connected to the input end of rectification module, and another in normally closed contact and the normally opened contact of described double throw switch is electrically connected to electric contact.
As can be seen here, between power module and rectification module, double throw switch is set, can select the electric signal of power module output whether to need to export after rectification module, the development bias voltage of feed circuit output can be to include DC component and AC compounent like this, also can be only to comprise DC component, use respectively contactless development and contact type developing, be conducive to user's choice for use.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing laser printer.
Fig. 2 is the STRUCTURE DECOMPOSITION figure that existing laser printer has dwindled.
Fig. 3 is the structural drawing of existing handle box.
Fig. 4 is the STRUCTURE DECOMPOSITION figure that existing handle box has dwindled.
Fig. 5 is the electrical schematic diagram of existing laser printer feed circuit.
Fig. 6 is the electrical schematic diagram of feed circuit in laser printer the first embodiment of the present invention.
Fig. 7 is the voltage oscillogram of power module outlet in laser printer the first embodiment of the present invention.
Fig. 8 is the voltage oscillogram at diode anode place in laser printer the first embodiment of the present invention.
Fig. 9 is the voltage oscillogram of rectification module output terminal in laser printer the first embodiment of the present invention.
Figure 10 is the electrical schematic diagram of feed circuit in laser printer the second embodiment of the present invention.
Figure 11 is the structural drawing of laser printer of the present invention the 3rd embodiment.
Figure 12 is the electrical schematic diagram of feed circuit in laser printer of the present invention the 3rd embodiment.
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment
Laser printer the first embodiment:
The present embodiment has housing, housing surrounds a cavity, a handle box is removably installed in cavity, handle box is equipped with developer roll, developer roll comprises mandrel and is wrapped in the elastic layer outside mandrel, and one end of mandrel is connected with conducting strip, a part for conducting strip extends to outside the housing of handle box.
The inside surface of laser printer cavity is provided with an electric contact, and handle box is installed to after cavity, and conducting strip contacts with electric contact, and electric contact is exported development bias voltage by conducting strip to developer roll.And, in laser printing engine housing, circuit board being installed, circuit board is provided with control circuit, the feed circuit etc. of laser printer.The difference of the present embodiment and existing laser printer is that feed circuit are provided with rectification module.
Referring to Fig. 6, the feed circuit of the present embodiment have power module 51 and rectification module 52, power module 51 has alternating current source AC, and be provided with capacitor C 11, diode D11 and resistance R 11, R12, R13, the electric signal of its output terminal output includes DC component and AC compounent, and DC component is lower than 0 volt, is namely negative voltage.As shown in Figure 7, it is square wave to the voltage oscillogram of power module 51 output terminals, and voltage mxm. is higher than 0 volt.
Rectification module 52 has diode D12, capacitor C 12, resistance R 14, R15 and voltage stabilizing diode ZD1, and wherein diode D12 is as the rectifying device of the present embodiment, and the electric signal that power module 51 is exported carries out rectification.The negative electrode of diode D12 is connected with the output terminal of power module 51, and anode is connected with one end of resistance R 15.Because the negative electrode of diode D12 is connected with the output terminal of power module 51, therefore the direct current that power module 51 is exported can pass through diode D12, positive half cycle in AC compounent can not pass through diode D12, but negative half period can pass through diode D12, and therefore the signal on diode D12 anode is the direct current lower than 0 volt.
As shown in Figure 8, the part higher than 0 volt that power module 51 is exported is filtered the voltage oscillogram at diode D12 anode place, only retains the part lower than 0 volt in voltage waveform.
Rectification module 52 is also provided with the capacitor C 12 being connected between diode D12 and ground, and capacitor C 12 is as filtering device, for electric signal is carried out to filtering, guarantees that the direct-flow signal voltage waveform that rectification module 52 exports is steady.
In addition, rectification module 52 is also provided with voltage stabilizing diode ZD1, and voltage stabilizing diode ZD1 is as the voltage-stabilizing device of the present embodiment, and itself and resistance R 14 are connected in series, and are then connected between diode D12 and ground.Voltage stabilizing diode ZD1 can guarantee the voltage stabilization of diode D12 anode.
Rectification module 52 is also provided with swept resistance R15, the two ends of swept resistance R15 are connected to respectively the anode and ground of diode D12, and the centre tap of swept resistance R15 is connected to the output terminal 53 of rectification module 52, like this, by changing tapped position, the magnitude of voltage that adjustable output terminal 53 is exported.Certainly, in the present embodiment, output terminal 53 is also the output terminal of feed circuit, and therefore, centre tap is to be also electrically connected with electric contact, thereby to electric contact output development bias voltage.
The electric signal that power module 51 is exported, after the rectification of rectification module 52, is exported and is only comprised the electric signal of DC component and as development bias voltage output from output terminal 53, and development bias voltage is negative voltage, meets the need of work of contact type developing.And rectification module 52 is also provided with filtering device, voltage-stabilizing device, guarantee that the development bias voltage waveform that output terminal 53 exports is steady, and output voltage stabilization, be conducive to the work of handle box.The voltage oscillogram of rectification module 52 output terminals as shown in Figure 9, under the effect of filtering device and voltage-stabilizing device, rectification module 52 output voltage values galvanic currents.
Like this, user can be installed to the handle box of contact on the laser printer of the present embodiment and carry out print job, thereby can save printing cost.
Laser printer method of modifying the first embodiment:
The laser printer of existing contactless development is repacked into the laser printer of above-described embodiment, first need the end cap dismounting of laser printing engine housing, and circuit board is disassembled, then disconnect being electrically connected of feed circuit and electric contact, and on feed circuit, set up rectification module, rectification module is arranged between power module and the output terminal of feed circuit, and the particular circuit configurations of feed circuit and rectification module, as laser printer the first embodiment introduces, repeats no more.
Set up after rectification module, the output terminal of rectification module is electrically connected with electric contact, finally, by after circuit board and end cap installation, can use.Laser printer is carried out after above-mentioned repacking, and user can be installed to the handle box of contact type developing in the laser printer after repacking, saves and prints cost.And user only needs disposable laser printer to be reequiped, and without each handle box is reequiped, greatly facilitates user's use.
Laser printer the second embodiment:
The present embodiment has housing, housing surrounds a cavity, a handle box is removably installed in cavity, handle box is equipped with developer roll, developer roll comprises mandrel and is wrapped in the elastic layer outside mandrel, and one end of mandrel is connected with conducting strip, a part for conducting strip extends to outside the housing of handle box.The cavity inner surface of laser printer is provided with electric contact, and handle box is installed to after cavity, and conducting strip is electrically connected with electric contact, and electric contact is exported development bias voltage by conducting strip to developer roll.
In the housing of laser printer, circuit board is installed, circuit board is provided with control circuit, the feed circuit etc. of laser printer, the electrical schematic diagram of feed circuit as shown in figure 10, it comprises power module 56 and rectification module 57, power module 56 comprises alternating current source AC, capacitor C 21, diode D21 and resistance R 21, R22, R23, and the electric signal of its output comprises DC component and AC compounent.
The input end of rectification module 57 is electrically connected with the output terminal of power module 56, receives the electric signal that power module 56 is exported.Rectification module 57 has bridge rectifier circuit, and this rectification circuit is made up of four diode D22, D23, D24 and D25, and this bridge rectifier circuit forms the rectifying device of the present embodiment, an one output head grounding, and another output terminal is B point.
As seen from Figure 10, one end ground connection of bridge rectifier circuit output positive voltage, one end of output negative voltage is connected to B point.And, between B point and ground, be connected with the capacitor C 22 as filtering device, after connecting with resistance R 24 as the voltage stabilizing diode ZD2 of voltage-stabilizing device, be connected between B point and ground.The two ends of swept resistance R25 are connected to respectively B point and ground, and centre tap is electrically connected with output terminal 58, thereby to electric contact output development bias voltage.Therefore, the output terminal 58 of rectification module 57 is the negative voltage lower than 0 volt to electric contact output, to meet the need of work of contact type developing.
Like this, user can be installed to the handle box of contact type developing in the present embodiment and print work, saves and prints cost.
Laser printer method of modifying the second embodiment:
The laser printer of existing contactless development is repacked into the laser printer of above-described embodiment, first need the end cap dismounting of laser printing engine housing, and circuit board is disassembled, then disconnect being electrically connected of feed circuit and electric contact, and on feed circuit, set up rectification module, rectification module is arranged between power module and the output terminal of feed circuit, and the particular circuit configurations of feed circuit and rectification module, as laser printer the second embodiment introduces, repeats no more.Finally, the output terminal of rectification module and electric contact in electrical connection, by after circuit board and end cap installation.
Laser printer the 3rd embodiment:
Referring to Figure 11, the present embodiment has housing 61, and housing 61 comprises upper cover 62 and end cap 63, and upper cover 62 is provided with the press section of switch 64.Housing 61 surrounds a cavity, a handle box is removably installed in cavity, and handle box is equipped with developer roll, and developer roll comprises mandrel and is wrapped in the elastic layer outside mandrel, and one end of mandrel is connected with conducting strip, a part for conducting strip extends to outside the housing of handle box.The cavity inner surface of laser printer is provided with electric contact, and handle box is installed to after cavity, and conducting strip is electrically connected with electric contact, and electric contact is exported development bias voltage by conducting strip to developer roll.
In housing 61, circuit board is installed, circuit board is provided with control circuit, the feed circuit etc. of laser printer, and the electrical schematic diagram of feed circuit as shown in figure 12.Feed circuit are provided with power module 66 and rectification module 67, between the input end of the output terminal of power module 66 and rectification module 67, be connected with switch 64, switch 64 is double throw switch, its stiff end is electrically connected with the output terminal of power module 66, normally opened contact is connected to the input end of rectification module 67, and normally closed contact is connected directly to the output terminal 68 of feed circuit.
Power module 66 alternating current source AC, capacitor C 31, diode D31 and resistance R 31, R32, R33, the electric signal of its output comprises DC component and AC compounent.Rectification module 67 has the diode D32 as rectifying device, and the negative electrode of diode D32 is connected with the normally opened contact of switch 64.Rectification module 67 is also provided with as the capacitor C 32 of filtering device, as the voltage stabilizing diode ZD3 of voltage-stabilizing device, and voltage stabilizing diode ZD3 is connected between the anode and ground of diode D31 after connecting with resistance R 34.
Between the anode of diode D32 and ground, be also connected with swept resistance R35, the centre tap of swept resistance R35 is connected to output terminal 68, and the electric contact in cavity is exported development bias voltage.
The electric signal that power module 66 can be exported due to rectification module 67 carries out rectification, and forms the electric signal output that only comprises DC component, and this electric signal is the negative voltage lower than 0 volt, meets the need of work of contact type developing.User can be installed to the handle box of contact type developing in the present embodiment and print work, saves and prints cost.
And, because the present embodiment is provided with double throw switch, user can select according to the visualization way of handle box the visualization mode of laser printer, if the handle box that handle box is contact type developing, switch 64 can be selected to the position to normally opened contact, output only comprises the electric signal of DC component, if the handle box that handle box is contactless development, switch 64 is selected to the position to normally closed contact, the electric signal that output terminal 68 is exported comprises DC component and AC compounent, can meet the need of work of contactless development.
Laser printer method of modifying the 3rd embodiment:
The laser printer of existing contactless development is repacked into the laser printer of above-described embodiment, first need the end cap dismounting of laser printing engine housing, and circuit board is disassembled, then disconnect being electrically connected of feed circuit and electric contact, and on feed circuit, set up rectification module, rectification module is arranged between power module and the output terminal of feed circuit, and the particular circuit configurations of feed circuit and rectification module, as laser printer the 3rd embodiment introduces, repeats no more.
And, set up after rectification module, also need to increase switch, this switch is double throw switch, the connected mode of double throw switch is introduced as laser printer the 3rd embodiment.Finally, the output terminal of rectification module and electric contact in electrical connection, certainly, also need the output terminal of power module to be directly connected on electric contact.Like this, can allow user select the visualization mode of laser printer, more be conducive to user's free choice for use.Certainly, the press section of switch need to be arranged on the surface of shell of laser printer, with user friendly pressing operation.
Certainly, above-described embodiment is only preferably embodiment of the present invention, when practical application, can also have more variation, and for example, in the 3rd embodiment, the normally opened contact of double throw switch is electrically connected with output terminal, and normally closed contact is connected with the input end of rectification module; Or rectification module does not arrange filtering device, voltage-stabilizing device and swept resistance, directly by diode output electrical signals to electric contact, such change can realize object of the present invention equally.
The variations such as the change of the particular circuit configurations change of rectification circuit, filtering device, voltage-stabilizing device finally it is emphasized that and the invention is not restricted to above-mentioned embodiment, as also should being included in the protection domain of the claims in the present invention.

Claims (8)

1. laser printer, comprises
Housing, described housing surrounds cavity, and the inside surface of described cavity is provided with the electric contact for exporting development bias voltage;
Be arranged on the circuit board in described housing, described circuit board is provided with feed circuit, and described feed circuit are provided with power module, and described power module is for exporting development bias voltage to described electric contact;
It is characterized in that:
Rectification module, described rectification module receives the electric signal of described power module output, and the output terminal of described rectification module is electrically connected with described electric contact;
Double throw switch, the stiff end of described double throw switch is electrically connected with described power module outlet, in the normally closed contact of described double throw switch and normally opened contact one is electrically connected to the input end of described rectification module, and another in normally closed contact and the normally opened contact of described double throw switch is electrically connected to described electric contact.
2. laser printer according to claim 1, is characterized in that:
Described rectification module has rectifying device, and described rectifying device is the d. c. voltage signal lower than 0 volt to described electric contact output.
3. laser printer according to claim 2, is characterized in that:
Described rectifying device is diode, and the negative electrode of described diode is connected to the output terminal of described power module, and the anodic bonding of described diode is to described electric contact.
4. laser printer according to claim 2, is characterized in that:
Described rectification module is also provided with filtering device, and described filtering device is connected between described rectifying device and ground.
5. laser printer according to claim 2, is characterized in that:
Described rectification module is also provided with voltage-stabilizing device, and described voltage-stabilizing device is connected between described rectifying device and ground.
6. laser printer according to claim 2, is characterized in that:
Described rectification module is also provided with swept resistance, and the two ends of described swept resistance are connected to respectively described rectifying device and ground, and the centre tap of described swept resistance is electrically connected with described electric contact.
7. the method for modifying of laser printer, described laser printer has housing, described housing surrounds cavity, the inside surface of described cavity is provided with the electric contact for exporting development bias voltage, in described housing, circuit board is installed, described circuit board is provided with feed circuit, and described feed circuit are provided with power module, the output terminal of described feed circuit is electrically connected with described electric contact, it is characterized in that: the method comprises
Disconnect being electrically connected between described feed circuit output terminal and described electric contact, the rectification module of the electric signal that receives described power module output is set on described feed circuit, be electrically connected output terminal and the described electric contact of described rectification module;
On described feed circuit, double throw switch is set, the stiff end of described double throw switch is electrically connected with described power module outlet, in the normally closed contact of described double throw switch and normally opened contact one is electrically connected to the input end of described rectification module, and another in normally closed contact and the normally opened contact of described double throw switch is electrically connected to described electric contact.
8. the method for modifying of laser printer according to claim 7, is characterized in that:
Described rectification module has rectifying device, and described rectifying device is the d. c. voltage signal lower than 0 volt to described electric contact output.
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CN102508417B (en) * 2011-11-16 2014-06-18 珠海天威飞马打印耗材有限公司 Laser printer and modification method thereof
CN103116259B (en) * 2012-12-28 2014-09-10 珠海天威飞马打印耗材有限公司 Processing box and processing box modification method
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