WO2012003807A1 - 静电干粉移印装置以及用该装置实现大幅面打印的方法 - Google Patents

静电干粉移印装置以及用该装置实现大幅面打印的方法 Download PDF

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Publication number
WO2012003807A1
WO2012003807A1 PCT/CN2011/077009 CN2011077009W WO2012003807A1 WO 2012003807 A1 WO2012003807 A1 WO 2012003807A1 CN 2011077009 W CN2011077009 W CN 2011077009W WO 2012003807 A1 WO2012003807 A1 WO 2012003807A1
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WO
WIPO (PCT)
Prior art keywords
transfer
toner
dry powder
printed
charge
Prior art date
Application number
PCT/CN2011/077009
Other languages
English (en)
French (fr)
Inventor
罗春晖
Original Assignee
Luo Chunhui
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Luo Chunhui filed Critical Luo Chunhui
Publication of WO2012003807A1 publication Critical patent/WO2012003807A1/zh

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Classifications

    • 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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
    • G03G15/1675—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer with means for controlling the bias applied in the transfer nip

Definitions

  • the present invention relates to a device, particularly one, for use in a transfer step in a laser printing process.
  • Electrostatic dry powder printers made using electrophotographic technology and laser or LED scanning technology have been widely used. This approach usually involves the following seven steps:
  • Charging is to place the photosensitive drum in an electric field of a certain polarity, so that the surface is uniformly hooked with a certain polarity and quantity of static charge, that is, a process having a certain surface potential;
  • the image light signal is projected onto the surface of the photosensitive drum through an optical imaging system to form an electrostatic latent image with a surface potential fluctuation corresponding to the shade of the original image; a visible image.
  • Transfer is when the printing paper is in contact with the toner image on the surface of the rotating drum, the opposite polarity of the charge is added to the surface of the printing paper, so that the ink on the photosensitive drum The process of adsorbing powder onto printing paper.
  • the object of the present invention is to provide an electrostatic dry powder type pad printing device which can perform printing on a flat surface of various materials and shapes of materials which can withstand a certain fixing temperature.
  • An electrostatic dry powder type pad printing device characterized in that the device comprises a transfer carrier movable between the photosensitive drum and the object to be printed, and a transfer surface for adsorbing the toner on the transfer carrier, when the transfer surface faces the photosensitive When the drum is used, the toner on the photosensitive drum is transferred to the transfer surface, and there is a charge loading device on the transfer carrier. When the transfer surface is located above the printed object, the charge loading device is loaded on the back side of the transfer surface with the toner. A voltage with the same polarity of charge.
  • the transfer carrier comprises a transfer belt, and a transfer belt driving device that drives the transfer belt to rotate cyclically.
  • the transfer carrier comprises a transfer plate movable between the photosensitive drum and the object to be printed.
  • the charge loading device is a transfer roller located above the printed object on the back side of the transfer surface.
  • the charge applying means is a metal plate having a DC bias which is on the back side of the transfer surface and has the same polarity as the toner charge, and the metal plate is movable in the direction of the vertical transfer surface.
  • a second charge loading means is disposed on the other side of the object on the surface of the object to be printed, and a DC bias having a polarity opposite to that of the toner charge is applied.
  • a DC bias having a polarity opposite to that of the toner charge is applied.
  • the apparatus further includes a second charge loading device that applies a charge opposite the polarity of the toner charge to the surface of the printed object.
  • the second charge loading device is a corona wire or a charging roller.
  • the charge loading device is further provided with a heating device for fixing.
  • a cooling device for cooling the transfer carrier is provided beside the charge loading device.
  • the pad printing device further includes a fixing device that is a laser heater that performs heating on a surface of the object.
  • the transfer belt is preferably plated with a polyimide film tape having a non-stick material to the toner, such as a polyimide film coated with polytetrafluoroethylene, or the like.
  • the transfer roller or the transfer plate and the fixing roller or the plate may be considered to be coated with an elastic material and a material having non-stick properties with the toner to ensure better contact with the object or ink. Powder separation.
  • the present invention also provides a method for large-format printing using a small-format laser or LED printer by using the above-mentioned apparatus, that the pattern to be printed is limited according to the format of the printer to be used, and is divided into no more than the limit of the format.
  • the small images are then sequentially transferred onto a transfer carrier in an electrostatic dry powder pad printing device, spliced into a complete image on a transfer carrier, and then transferred by a transfer carrier to the surface of the object. It is also possible to transfer a partial small tile to the object to be printed each time by the transfer carrier, and then move the object or the transfer belt, and sequentially transfer the respective blocks to the position corresponding to the whole image to realize large-format printing. .
  • the invention has the beneficial effects that: by the cooperation of the transfer carrier and the charge loading device, the transfer of the toner between the transfer carrier and the object to be printed can be realized, and can be performed on an object having a certain thickness or various irregular shapes. print.
  • the transfer belt can be used as a transfer carrier to achieve continuous transfer, and further large-format printing can be realized.
  • the use of a transfer roller or a metal plate as a charge loading device behind the transfer belt can accommodate different printed objects. Further, for a thin object to be printed, an additional charge can be applied to the object to be printed to assist in attracting the toner.
  • the large-format printing method of the present invention can perform large-format printing using a laser or LED printer having a small printing size, thereby saving printing costs.
  • Figure 1 is a schematic diagram of Embodiment 1 of the present invention.
  • Figure 1 is a schematic diagram of Embodiment 1 of the present invention.
  • Figure 3 is a schematic diagram of Embodiment 3 of the present invention.
  • Figure 4 is a schematic diagram of Embodiment 4 of the present invention.
  • Fig. 5 and Fig. 6 are explanatory views showing the principle of large-format printing using a small-format laser printer according to the present invention.
  • Figures 7 and 8 are schematic diagrams of another embodiment of large format printing using a small laser printer.
  • Figure 9 is a schematic illustration of another embodiment of the present invention.
  • Figure 10 is a schematic illustration of the system of Figure 9 for transferring an image from a color laser printer to a transfer belt.
  • Figure 11 is a side view of Figure 10.
  • Figures 12 and 13 are partial enlarged views of Figure 10.
  • Figure 14 is a schematic illustration of the portion of the color laser printer of Figure 9.
  • Figure 15 is a schematic view of the fixing system of Figure 9.
  • Figure 16 is a front elevational view of Figure 15.
  • Figures 17 and 18 are schematic views of the lift stage of Figure 9.
  • Figure 19 is a schematic illustration of a particular embodiment of a pad printing device.
  • Figure 20 is a schematic illustration of an image transfer transfer assembly in accordance with another embodiment of the present invention.
  • Figure 21 is a partial enlarged view of Figure 14. detailed description
  • Embodiment 1 of the present invention an electrostatic dry powder type pad printing device, the schematic diagram of which is shown in FIG. 1, wherein 101 is an exposure device, 102 is a developing device, 103 is a charging device, and 104 is a photosensitive drum.
  • 105 is a cleaning device
  • 106 is a primary transfer device
  • 107 is a transfer belt
  • 108 is a transfer belt driving device
  • 109 is a secondary transfer lifting drive device
  • 1 10 is a secondary transfer roller
  • 116 is a static elimination device
  • 111 is the fixing stick
  • 114 is the transfer belt tensioning device
  • 115 is the transfer belt cleaning device
  • 112 is the printed workpiece
  • 11 3 It is a workpiece placement platform that can be moved up and down.
  • the charging device 103 charges the photosensitive drum, and then the exposure device 101 exposes the photosensitive drum 104 to form an electrostatic latent image, and then adsorbs the toner in the developing device 102 through the transfer roller 106.
  • a direct current bias opposite to the charge of the toner is applied to transfer the toner onto the transfer belt 107, and the cleaning device 105 cleans the photosensitive drum.
  • the operation and structure of these components are the same as those in the prior art for charging, exposure, and development. Similar to the transfer procedure.
  • the toner transferred onto the transfer belt 107 is moved above the workpiece 112, at which time the elevation driving device 109 of the secondary transfer device is depressed by the secondary transfer
  • the stick 110 that is, the charge loading device, is simultaneously applied with a DC bias having the same polarity as the toner charge, and is driven by the lift driving device 109 to roll over the workpiece 112, due to the principle of homosexual repelling.
  • the toner is repelled to the surface of the workpiece 1 12, and at the same time, the static elimination device 110 is moved together with the secondary transfer device, which is responsible for eliminating the static electricity on the transfer belt, facilitating the separation of the transfer belt and the workpiece, and the transfer belt.
  • the tensioning device 114 prevents the secondary transfer driving device 109 from being pressed down, the transfer belt 107 and the workpiece 112 are not in contact, and the transfer belt is driven by the driving device 108 to stop the image from rotating above the workpiece, and then twice.
  • the transfer driving device 109 presses the transfer roller 110 the transfer belt 107 can be tensioned so that the transfer belt other than the portion depressed by the transfer roller 110 does not contact the workpiece 112 and can be separated after contact.
  • the elevation driving device 109 lifts the secondary transfer roller 110 and the static eliminating device 1 16 to lift them up.
  • the transfer belt driving device 108 drives the transfer belt 107 to continue to rotate, and starts the next printing with the photosensitive drum 104.
  • the cleaning device 115 rotates. The untransferred toner on the printing tape 107 is clean.
  • the entire upper image forming transfer device can be moved, or lowered or moved by the carrier platform 113, and then heated by the fixing device 1 11 along the surface of the workpiece.
  • the degree and pressure roll over the surface of the workpiece 112 so that the toner remaining on the surface of the workpiece is heated and melted and fixed to the surface of the workpiece.
  • the loading platform 113 and the upper transfer system can perform relative movements of up, down, left and right, and the surface of the load platform 113 can be applied with a DC bias opposite to the polarity of the toner charge to assist in the separation of the toner.
  • Embodiment 2 of the present invention an electrostatic dry powder type pad printing device, the schematic diagram of which is shown in FIG. 2, wherein 201 is a lifting drive device for lifting and lowering the secondary transfer plate 202 while moving along the axis 209 207 is a transfer belt, 203 is a transfer belt tensioning device, 204 is a transfer belt cleaning device, 208 is a transfer belt cooling device, 205 is a printed workpiece, and 206 is a load platform.
  • 201 is a lifting drive device for lifting and lowering the secondary transfer plate 202 while moving along the axis 209
  • 207 is a transfer belt
  • 203 is a transfer belt tensioning device
  • 204 is a transfer belt cleaning device
  • 208 is a transfer belt cooling device
  • 205 is a printed workpiece
  • 206 is a load platform.
  • the solution uses a flat plate to which the same DC bias voltage as the charge polarity is applied.
  • the lifting device 201 will perform the second transfer.
  • the plate 202 is pressed to bring the transfer belt close to or in contact with the object, and then a DC bias having the same polarity as the charge is applied, at which time the toner is transferred onto the workpiece 205 due to the principle of homogeneity, and then the lifting drive 201 is lifted.
  • the secondary transfer flat plate 202 due to the action of the tensioning device 203, the transfer belt is simultaneously left on the workpiece, the toner is left on the workpiece 205, and then the transfer belt can be rotated again to transfer the toner on the photosensitive drum.
  • the secondary transfer plate 202 can also be made smaller than the maximum print size, and after being lifted up by the lift drive unit 201, it can be translated along the axis 209 and then depressed again.
  • the plate 202 may have a heating device built therein, and while being depressed, the surface of the transfer belt is coated with a heat-resistant and heat-resistant material, in addition to repelling the toner using a DC bias, for example. Teflon-like substances, in addition to being repelled by the toner, are also different in adhesion to different substances when the toner is heated and melted, thereby facilitating separation of the toner and improving production efficiency.
  • the transfer belt rotates again, the cleaning device 204 removes the residual toner, and the cooling device 208 lowers the temperature of the transfer belt 207 so that it remains at a suitable temperature during continuous operation.
  • the stage 206 and the stage 113 of FIG. 1 are of the same nature.
  • Embodiment 3 of the present invention an electrostatic dry powder type pad printing device, the schematic diagram of which is shown in FIG. 3, in which 301 is an exposure device, 302 is a photosensitive drum, 303 is a developing device, 304 is a charging device, and 305 is The cleaning device, 306 is a transfer belt, 307 is a primary transfer roller, 308 is a transfer belt driving device, 309 is a fixing device, 311 is a transfer belt cleaning device, 310 is a secondary transfer device, and 314 is a static elimination device. , 312 is the workpiece, and 313 is the load platform.
  • the load platform 313 and the upper image forming fixing device are relatively movable, and the moving speed is exactly the same as the image forming speed between the transfer belt and the photosensitive drum.
  • the image on the transfer belt is also synchronously transferred onto the workpiece, and at the same time, the fixing device 309 is synchronously fixed.
  • the relative movement between the loading platform 313 and the image forming fixing device can be printed without interruption.
  • the image forming fixing device and the loading platform are relatively movable, and the transfer belt and the fixing device are synchronized without stopping during operation.
  • Embodiment 4 of the present invention an electrostatic dry powder type pad printing device, the schematic diagram of which is shown in FIG. 4, wherein 401 is a guide rail, 402 is a lifting drive device, and 403 is a metal plate, and the surface is plated with an insulating elastic non-stick.
  • the layer 405 is a photosensitive drum
  • 404 is a developing device
  • 406 is an exposing device
  • 407 is a charging device
  • 408 is a cleaning device
  • 409 is a cleaning and destaticizing device
  • 410 is a lifting device of 409
  • 411 is a cooling device
  • 412 is 411.
  • Lifting device. 414 is the workpiece to be printed
  • 413 is the load platform.
  • the photosensitive drum is charged, exposed, and developed to form a toner image.
  • the transfer plate 403 is applied with a DC bias opposite to the charge of the toner, and its insulating layer and the photosensitive drum are connected, and it is driven.
  • the movement is along the guide rail 401, the direction and speed are the same as the rotation direction and the linear velocity of the photosensitive drum, and the toner on the photosensitive drum is attracted by the DC bias on the transfer plate 403 opposite to the polarity of the toner charge.
  • the transfer plate 403 is moved from the position A to the position B along the guide rail 401 under the driving of the driving device 402, at which time the cleaning device 409 and the cooling device 411 are lifted and lowered. Devices 410 and 412 are lowered and are not in contact with plate 403.
  • the lifting devices 41 0 and 412 raise the cleaning static eliminating device 409 and the cooling device 411 (if not heated, the cooling device 411 may not be required), when the plate 403 passes the cleaning static eliminating device 409 and When the device 411 is cooled, it comes into contact with them, removes the uncleaned toner, and removes static electricity on the board. At the same time, the plate 403 is cooled to a suitable temperature.
  • the invention utilizes a small-format laser printer for large-format printing.
  • the principle explanation is shown in FIG. 5 and FIG. 6.
  • 501 may be any one of the above embodiments, and the electrostatic dry powder type printing device, 502 And 503 are ⁇ , ⁇ direction guides, 504 is the printed object, 505 is the expected image is divided into multiple small figures in the computer, each letter represents a small picture, wherein each small picture has a size less than or equal to The maximum pattern that can be printed by the electrostatic dry powder pad printing device 501.
  • the electrostatic dry powder pad printing device 501 starts to work, it can perform the ⁇ -direction movement along the guide rails 502 and 503, so when it prints the small image A, it can first move to the workpiece 504 to be printed. Above the position, the post-print A is moved, and then moved to the top of the position B, and the pattern B is printed, so that the pattern 505 is completely printed on the workpiece 504 by printing the plurality of patterns as many times as possible.
  • FIG. 7 Another embodiment of the invention for large-format printing using a small-format laser printer, the principle of which The figure is shown in Figure 7 and Figure 8, in which: 601 is the expected image is divided into multiple small images in the computer, each image is less than or equal to the maximum pattern that can be printed by the printer 602, 602 is including exposure, charging
  • the integration of the developing, cleaning, etc. device, 608 is a photosensitive drum, which is mounted in the integrated 602, 603 is a guide rail, 602 is movable along 603, 604 is a transfer belt, 605 is a transfer belt driving device, and 607 is a transfer roller.
  • the integrated 602 moves along the guide rail 603 to the position of the transfer belt printing image A, and then the driving device 605 drives the transfer belt 604 to rotate, and the images A, C, E, G are sequentially printed on the transfer belt by the transfer roller 607.
  • the integrated device 602 moves along the guide rail 603 to the position where the printed image B is stopped, and the driving device 605 drives the transfer belt 604 to sequentially print the images B, D, F, H on the transfer belt to form a complete image.
  • the drive device then rotates the transfer belt to the image facing the printed object 606, and transfers it to the object using the method described in Figures 1, 2, and 3.
  • the methods such as electrostatic imaging, cleaning, cooling, static elimination, etc. are not described in detail, and the laser or LED color or monochrome electrostatic printing of various methods is not described in detail, since these are Known technology, those skilled in the art should understand, at the same time, using different methods to complete the color electrostatic printing, heating, cleaning, cooling, charge treatment, etc. in the present invention, as long as it is known in the art, should be included in the present invention Inside.
  • the invention does not require plate making and does not require coating, and the effect is not as good as that of inkjet, but it is better than silk screen printing and pad printing, and the speed is several times faster than inkjet, and it does not need to be coated like inkjet. And the current precision can also reach the photo level.
  • white has always been a difficult point for inkjet. To meet the coverage and not block the nozzle, it is not ideally solved.
  • white toner is easy to manufacture and implement.
  • 801 is a color laser printer
  • 802 is a system for transferring an image from a color laser printer 801 onto a transfer belt
  • 803 is a fixing system
  • 804 is A loading platform for lifting and moving back and forth.
  • FIGS 10, 11, 12, and 13 are detailed descriptions of the system 802, wherein 901 is a transfer stick, 902 is a transfer belt, 903 is a cleaning device, 904 is a belt stick, 905 is a spring, and 906 is 2 turns.
  • Printing stick 907 is the transfer belt tensioning device
  • 908 is the transfer belt supporting stick
  • 909 is the grating belt
  • 911 is the transfer belt clamping and dragging head
  • 91 0 is mounted on the 911 for reading
  • the sensor on the position of the grating strip 909, 912 is the home position sensor
  • 91 3 is the end position sensor
  • 914 is the drive screw
  • 915 is the drive motor
  • 915 is driven by the gear 916 to drive the screw 914, 914 and the entrainment device 911, 928
  • It is a secondary transfer holder, and its two ends are connected by a linear bearing 930 and a slide rail 921, and 938 is an electromagnet, which is responsible for lifting and lowering the transfer
  • the 917 is the starting position photoelectric sensor, the 919 is the light shielding film, and the 929 is the end position sensor.
  • 932 is a static elimination device.
  • 918 is the motor
  • 923 is the slide rail
  • 924 is the lead screw connected to the motor 918, and is used to drive the entire device 802
  • 922 is the home position sensor
  • 933 is the end position sensor.
  • FIG 14 is a detailed description of a color laser printer 801, 1 001 is a laser head, 1002 is a drum integrated device, 1 003 is a transfer roller, and 1004 is a transfer belt.
  • FIGS 15 and 16 are detailed descriptions of the fixing system 803, which is a motor, which is connected to a screw 1107, which is connected to a fixing bracket 1110 by a screw sleeve 1111, 1110 is mounted in a guide groove 1104, and 1112 is a fixing bracket 1110 and
  • the fixing stick bracket 111 3 is connected to the sliding tube, 1108 is a spring, 1106 is a lifting electromagnet, 1 103 is a home position sensor, 1105 is an end position sensor, and 1102 is a light shielding sheet.
  • 17 and 18 are detailed introductions of the lifting stage 804, which is a loading platform mounted on the chute 1205 of the lifting table 1211, 1206 is a motor, connected to the screw 1207, and 1209 is the starting position.
  • the sensor is located, 1208 is the end position sensor, 1202 and 1227 are the screw rods connected to the lifting table 1211, 1201 and 1226 are the screw sleeves of the outer belt pulley, 1204 and 1205 are the motor, 1204 and the motor 1225 are equipped with the motor of the synchronizing device.
  • 1203 and 1228 are drive belts, 1222 is the starting position sensing crying
  • the working process of the machine is such that, first, the motor 918 drives the screw 924 to rotate, moving the entire device 802 along the sliding tube 923, and separating from the cleaning device 903 and the laser printer 801, when the sensor 922 detects 802 and it does not touch and When the position sensor 933 is reached, the motor 918 is stopped.
  • the printer 801 is powered on and self-tested.
  • the motor 915 rotates, and the screw 914 is rotated by the gear 916 to move the transfer belt clamping bracket 911 toward the home position sensor 912.
  • the motor stops.
  • the electromagnet 918 does not work, and under the action of the spring 905, the secondary transfer roller 906 is lifted up along the sliding tube 931, and the transfer belt 902 is not in contact, and the motor 925 drives the gear 926.
  • the driving screw 927 rotates to drive the secondary transfer holder 928 to move to the position sensor 917.
  • the motor 925 stops.
  • the electromagnet 11 06 does not operate, and under the support of the spring 1108, the fixing roller 1109 is pushed up to the highest position along the chute 11 12 .
  • the motor 1101 rotates to drive the screw 1107, and the bracket 1110 is driven by the screw sleeve 11 11 to the starting position sensor 1103, and the motor stops.
  • the printed article is placed on the platform 1210. At this time, by adjusting the motor 1206, the starting position of the object to be printed reaches the transfer belt 902, and the motors 1204 and 1225 are adjusted to raise or lower the object to and from the transfer belt. 902 next suitable height.
  • a print command is sent to the laser printer 801 through the computer, and an image is formed on each of the toner drum integrated devices 1002 by the laser 1001, and then through the transfer roller. 1003 is sequentially printed on the primary transfer belt 1004.
  • the motor 918 drives the screw 924 to move toward the position sensor 922, so that the whole The device 802 moves and cleans the device 903 and the transfer belt 1004.
  • the position sensor 922 detects that the device 802 is in motion, the motor 924 stops. This moment is pre-designed, just the transfer belt 1004 and the secondary transfer belt 902.
  • the motor 915 When contacting, the image on the transfer belt 1004 is about to reach the position of the contact point. At this time, the motor 915 operates, and the driving screw 914 is rotated by the gear 916 to drive the transfer belt clamping bracket 911 to move toward the position sensor 913, and the sensor The 910 detects the raster band 909 reading, and feeds back to the motor 915, so that the motor 915 drives the transfer belt clamping bracket 911 to drag the transfer belt at the same speed as the transfer belt 1004, when the cleaning device 903 has been cleaned.
  • the image of the transfer belt 1004 is also pre-designed and just arrived, at which time a voltage opposite to the polarity of the toner is applied to the transfer roller.
  • the toner on the transfer belt 1004 is transferred onto the transfer belt 902.
  • the transfer roller 901 stops being pressurized, and the motor 918 drives the screw 924 to drive the entire device 802 to the position sensor 933.
  • Directional movement when the position sensor 933 is reached, the motor 915 is stopped, at which time the transfer belt and the cleaning device 903 are separated, and the motor 915 now drives the screw 914 in the reverse direction, driving the transfer belt 902 to move toward the position sensor 912, and the sensor 910 detects
  • the reading of the grating strip 909 when determining that the image on the transfer belt is in a proper position above the object to be printed, the motor 915 is stopped. In this process, since the transfer belt passes through the transfer roller 901 again, the transfer roller can be considered.
  • 901 Apply a suitable voltage to enhance the chargeability of the toner (not necessary, only useful for certain objects to be printed).
  • the electromagnet 938 operates to press the transfer roller 906, since 907 is a spring-loaded tension pulley, at which time the transfer belt 902 is 906.
  • the depressed portion contacts the workpiece to be printed, at which time the motor 925 operates to drive the gear 926, and the driving screw 927 moves toward the position sensor 929, while applying a polarity to the transfer roller 906 that is the same as the current toner charge.
  • the voltage causes the toner on the transfer belt to be repelled onto the workpiece.
  • the platform 1210 can also be considered to apply a voltage opposite to the polarity of the toner to help the toner separate and adsorb.
  • the transfer belt 902 is separated from the object to be printed by the tension provided by the tension pulley 907, and the static eliminating device 932 on the secondary fixing bracket provides elimination of excess static electricity on the transfer belt 902, assisting in separation and next printing.
  • the motor 925 can be designed as a servo or stepper motor.
  • the stage moves forward to the fixing device 803.
  • the electromagnet 1106 operates to press the fixing roller 1109, and the fixing roller 1109 is a temperature-controlled heating device, and the surface is coated with no
  • the motor 1 101 drives the screw 1107 to rotate
  • the driving bracket 1110 moves forward
  • the fixing stick 1109 is heated and rolled from the surface of the object to be printed, so that the toner is solidified on the surface of the object to be printed.
  • the electromagnet stops working, and the spring 1 108 lifts the fixing roller 1109 out of the surface of the object to return to the home position. Printing is complete.
  • the puzzle can be used in the method of Figure 5 or 6, or multiple patterns to be printed.
  • One continuous transfer to the secondary transfer belt although there is a gap between each image, since each device is equipped with a grating positioning device, each pattern can be transferred to the workpiece in turn, specifically, One of the patterns is turned onto the object, and then the secondary transfer device is lifted, the transfer belt is moved to the parallel alignment position, and after the transfer is performed, the plurality of lateral patterns are stitched together, the loading platform moves forward, and then The same way to complete the second row, and so on, until the completion of all the patterns, the advantage of this approach is that the laser printers on the market, the speed of printing sheets is very slow, but the continuous printing is very fast, which is very efficient.
  • the disadvantage is that the transfer belt needs to be long and the size of the device will be large.
  • the transmission mode is not limited to the screw, and other suitable mechanical transmission methods are available.
  • the clutching method is not limited to electromagnets, cams or other known mechanical clutching methods.
  • the fixing device can be considered to be replaced by various means known in the art, such as a manner of fixing a film.
  • the laser printer can be used in the form of white + red + blue + yellow, or white + CMYK, in addition to the ordinary CMYK four-color mode. If a commercially available printer is used for remanufacturing, it is recommended to use a monochrome laser printer with a combination of white toner and a color laser printer.
  • the structure is first transferred to white, and then transferred to color.
  • 1, 301 and 1 302 are electrostatic pad printing machines as described in this embodiment, wherein 1 301 is a white machine, 1 302 is a color machine, 1 303 is a workpiece, and 1 304 is a conveying device.
  • the object is first sent to the white machine 1 301 and printed with white, and then sent to the color machine 1 302 by the transport device 1 304 to be printed with color. To meet the printing of dark objects.
  • Embodiment 2 In the present embodiment, the carrier platform and the fixing device are the same as those of Embodiment 1, except for the aspect of image transfer.
  • Figures 20 and 21 are imaging transfer assemblies of the device.
  • 1401 is a laser
  • 1402 is a powder drum assembly
  • 1403 is a transfer belt
  • 1404 is an image sensor
  • 1405 is a tow pulley
  • 1406 is a transmission belt
  • 1407 is a motor
  • 1419 is a transfer roller
  • 1408 is a secondary transfer drive motor.
  • 1409 is a screw
  • 1410 is a lifting device of the secondary transfer roller, and is driven by the screw 1409 to move back and forth
  • 141 3 is a secondary transfer stick
  • 1421 is a static elimination device
  • 1415 is an object to be printed
  • 1416 is a load
  • 1414 is a transfer belt tensioning pulley
  • 1417 is a spring
  • 1418 is a tensioning rod
  • 1411 is a cleaning device
  • 1412 is a towing pulley
  • 1420 is a transfer belt position sensor.
  • the working mode of this embodiment is that after the computer issues a print command, the laser 1401 and the toner powder The image is printed on the transfer belt 1403 by the transfer roller 1419 to form a color image.
  • the moving direction of the transfer belt is moved from the direction of the cleaning device 1411 to the image detecting device 1404, and the motor 1407 drives the tow wheel 1405 to provide Power
  • the transfer belt is a closed belt, on the side of the transfer belt, not on one side of the image printing area, printed with a certain interval of white spots, where the transfer belt position detecting device 1420 passes at these white points Directly above, it is a photoelectric reflection detecting device that detects the moving speed of the transfer belt by detecting the white point to control the rotational speed of the motor 1407.
  • the 1404 is a photoelectric reflection detecting device for determining the initial position of the image and the self-test. Correct the image position. After the image is printed on the transfer belt 1403, under the driving of the motor 1407, the tow bar is driven by the frictional force to rotate the transfer belt counterclockwise in the figure, and the image is transferred to the upper side of the workpiece 1415 to be printed, and the image is detected. The information obtained by the sensor 1404 and the transfer belt position sensor 1403 is fed back, and the motor 1407 is stopped when the image is rotated above the workpiece 1415, and then the secondary transfer lifting device lowers the secondary transfer roller 141 3 and the static eliminating device 1421, The transfer belt 1403 is pressed against the surface of the workpiece.
  • the other transfer belts are not in contact with the workpiece 141, and when the motor 1408 is pulled by the transfer roller 141 3
  • the transfer roller 141 3 is applied with a voltage of the same polarity as the toner on the transfer belt, and the toner is discharged from the transfer belt to the surface of the workpiece, and at the same time, the static eliminating device 1421 is paired Excess static electricity on the transfer belt is removed. Under the tension of the tensioning pulley 1414, the belt not pressed by the secondary transfer roller is separated from the workpiece.
  • the secondary transfer lifting device 1410 Lift the transfer roller 141 3 and make it
  • the transfer belt 1403 is not in contact with the transfer belt 1414, and the transfer belt 1403 is also not in contact with the workpiece 1415 under the tension of the tension pulley 1414.
  • the voltage applied to the transfer roller 141 3 is stopped, and the motor 1408 is driven to return to the initial position.
  • the transfer belt 1403 is driven by the motor 1407 to start the next printing, and the toner remaining on the transfer belt is scraped off by the cleaning blade 1411 which is in close contact with the tow pulley 1412 as the transfer belt rotates.
  • the load platform 1416 transfers the workpiece 1415 to the fixing device for fixing.
  • the method of printing a white image and splicing a large image with a small image is the same as that of the first embodiment. All features disclosed in this specification, or steps in all methods or processes disclosed, can be combined in any manner other than mutually exclusive features and/or steps.
  • the invention is not limited to the specific embodiments described above.
  • the invention extends to any new feature or any new combination disclosed in this specification, as well as any novel method or process steps or any new combination disclosed.

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Abstract

一种使用粉末显影剂的静电转印装置包括可以在感光鼓（104）和被印物体（112）间运动的转印载体（107），在转印载体（107）上有用于吸附调色剂的转印面，当转印面朝向感光鼓（104）时，感光鼓（104）上的调色剂转印到转印面上，在转印载体（107）上还有一个电荷加载装置（110），当转印面位于被印物体（112）上方时该电荷加载装置（110）在转印面背面加载与调色剂所带电荷极性相同的电压。该转印装置通过转印载体（107）和电荷加载装置（110）的配合，可以实现调色剂在转印载体（107）和被印物体（112）之间的转移，可以在有一定厚度或各种不规则形状的物体上进行打印。

Description

静电干粉移印装置以及用该装置实现大幅面打印的方法 技术领域
本发明涉及用于激光打印过程中的转印步骤的装置， 尤其是一种。
背景技术
利用电子照相技术和激光或 LED扫描技术制成的静电干粉式打印机， 已经 被广泛应用。 这种方式通常包括以下 7个步骤：
1、 充电， 就是将感光鼓处在某一极性的电场中， 使其表面均勾地带上一 定极性和数量的静电荷， 即具有一定表面电位的过程；
2、 曝光， 图像光信号经光学成像系统投射到感光鼓表面， 形成一个与原 稿图像浓淡相对应的表面电位起伏的静电潜像； 可见图像。
4、 转印， 转印就是当打印纸与转动的感光鼓表面的色粉图像接触时， 在 打印纸的表面加上比感光鼓更强的极性相反的电荷，从而将感光鼓上的墨粉吸 附到打印纸上的过程。
5、 分离， 消除打印纸上的电荷， 将紧贴在感光鼓表面的打印纸从感光鼓 上剥落（分离） 下来。
6、 定影， 釆用加热与加压的方式， 将墨粉中的树脂熔化进行定影经过加 热加压成为永久的图像。
7、 清洁， 清除经转印后还残留在感光鼓表面色粉的过程。
上述的打印技术需要在打印纸张或类似的薄膜上附加电荷，利用电荷异性 相吸进行转印， 不可能使用在有一定厚度或各种不规则形状的物体上。 发明内容
本发明的目的是提供一种能在各类能承受一定定影温度的材质， 不同形状 的物体上， 较平整的面上实施打印的静电干粉式移印装置。
本发明的技术方案如下：
一种静电干粉式移印装置， 其特征在于， 该装置包括可以在感光鼓和被印 物体间运动的转印载体， 在转印载体上有用于吸附墨粉的转印面， 当转印面朝 向感光鼓时， 感光鼓上的墨粉转印到转印面上， 在转印载体上还有一个电荷加 载装置， 当转印面位于被印物体上方时该电荷加载装置在转印面背面加载与墨 粉所带电荷极性相同的电压。
本发明的附加技术方案如下：
优选地， 所述的转印载体包括一个转印带， 和驱动转印带循环转动的转印 带驱动装置。
优选地， 所述的转印载体包括一个可以在感光鼓和被印物体间移动的转印 板。
优选地， 所述的电荷加载装置是一个位于被印物体上方， 在转印面背面的 转印棍。
优选地， 所述的电荷加载装置是一个位于转印面背面， 带有和墨粉电荷相 同极性的直流偏压的金属板， 该金属板可以沿垂直转印面的方向移动。
优选地， 在转印载体上还具有静电消除装置。
优选地， 在被打印物体表面的物体另一面设置一个第二电荷加载装置， 施 加一个和墨粉电荷极性相反的直流偏压。 来协助墨粉分离。
优选地， 本装置还包括一个对打印物体表面施加和墨粉电荷极性相反电荷 的第二电荷加载装置。
优选地， 所述的第二电荷加载装置是电晕丝或充电辊。
优选地， 所述的电荷加载装置上还设有用于定影的加热装置。
优选地， 在电荷加载装置旁边还设有对转印载体进行冷却的冷却装置。 优选地， 该移印装置还包括定影装置， 定影装置是对物体表面有墨粉的地 方来实施加热的激光加热器。
优选地， 所述的转印带， 优选镀有与墨粉具有不沾性材料的聚亚酰胺薄膜 带， 如镀有聚四氟乙烯的聚亚酰胺薄膜， 或类似的材料。
优选地， 所述的转印棍或转印板以及定影辊或板， 可以考虑在表面涂敷有 弹性材料以及与墨粉具有不沾性的材料， 以保证更好的和物体接触或和墨粉分 离。
本发明还提供了一种通过使用上述设备来实现用小幅面激光或 LED打印机 进行大幅面打印的方法， 即将要打印的图案按所釆用的打印机的幅面限制， 分 成不超过这个幅面限制的多个小图，然后依次转印到静电干粉式移印装置中的 转印载体上， 在转印载体上拼接成一个完整图像， 然后由转印载体一次转印到 物体表面。 也可以由转印载体每次将一个局部的小图块转印到被印物体上， 然 后移动物体或转印带， 依次转印各个图块到和整图对应的位置， 实现大幅面的 打印。
本发明的有益效果是： 通过转印载体和电荷加载装置的配合， 可以实现墨 粉在转印载体和被打印物体之间的转移，可以在有一定厚度或各种不规则形状 的物体上进行打印。进一步的，釆用转印带作为转印载体可以实现连续的转印， 并进一步的可以实现大幅面打印。使用转印辊或金属板作为转印带背后的电荷 加载装置可以适应与不同的被打印物体。更进一步的，对于较薄的被打印物体， 可以釆用在被打印物体上附加电荷， 起到辅助吸引墨粉的作用。 通过本发明的 进行大幅面打印的方法可以使用打印幅面较小的激光或 LED打印机进行大幅面 打印， 节约了打印成本。 附图说明
本发明将通过例子并参照附图的方式说明， 其中：
图 1是本发明实施例 1的原理图。
图 1是本发明实施例 1的原理图。 图 3是本发明实施例 3的原理图。
图 4是本发明实施例 4的原理图。
图 5、 图 6是本发明利用小幅面的激光打印机进行大幅面打印的原理说明 图。
图 7和图 8是利用小幅激光打印机进行大幅面打印的另一种实施例的原理 图。
图 9是本发明的另一实施例的示意图。
图 10是图 9中将图像从彩色激光打印机转印到转印带上的系统的示意图。 图 11是图 10的侧视图。
图 12、 1 3是图 10中的局部放大视图。
图 14是图 9中彩色激光打印机部分的示意图。
图 15是图 9中定影系统的示意图。
图 16是图 15的主视图。
图 17、 18是图 9中的升降载物台的示意图。
图 19是一种移印装置具体实施例的示意图。
图 20是本发明另一实施例的成像转印组件的示意图。
图 21是图 14的局部放大视图。 具体实施方式
本发明的具体实施例 1 ,一种静电干粉式移印装置，其原理图如图 1所示，， 图中 101是曝光装置， 1 02是显影装置， 103是充电装置， 104是感光鼓， 105 是清洁装置， 106是一次转印装置， 107是转印带， 108是转印带驱动装置， 109 是二次转印升降驱动装置， 1 10是二次转印棍， 116是静电消除装置， 111是定 影棍， 114是转印带张紧装置， 115是转印带清洁装置， 112是被印刷工件， 11 3 是可升降移动的工件置放平台。
该实施例的工作方式和结构如下： 充电装置 103对感光鼓充电， 然后曝光 装置 101对感光鼓 104曝光，形成静电潜像，然后吸附显影装置 102内的墨粉， 通过在转印棍 106上施加一个和墨粉电荷相反的直流偏压将墨粉转印到转印带 107上， 清洁装置 105对感光鼓进行清洁， 这些部件的工作方式和结构与现有 技术中的充电、曝光、显影和转印步骤相似。在转印带驱动装置 1 08的驱动下， 被转印到转印带 107上的墨粉被移动到工件 112的上方，这时二次转印装置的 升降驱动装置 109压下二次转印棍 110 ,即电荷加载装置，同时二次转印棍 110 被施加了一个和墨粉电荷极性相同的直流偏压，在升降驱动装置 109的驱动下 滚过工件 112 , 由于同性相斥的原理， 墨粉被排斥到工件 1 12的表面， 同时和 二次转印装置一起运动的还有静电消除装置 110 ,负责使消去转印带上的静电， 方便转印带和工件分离，转印带张紧装置 114使二次转印驱动装置 109没有压 下来时，转印带 107和工件 112不接触，方便转印带在驱动装置 108的驱动下， 把图像转动工件上方停止， 然后当二次转印驱动装置 109压下转印棍 110时， 可以给转印带 107—个张力，使除了被转印棍 110压下的部分以外的转印带和 工件 112不接触以及同时接触后能分离，当二次转印棍 110在升降驱动装置 109 的带动下将要印刷的部分沿工件表面滚动转到工件上后，升降驱动装置 109提 起二次转印棍 110和消静电装置 1 16 , 使它们被提起并退回到起始位置， 这时 转印带驱动装置 108驱动转印带 107继续转动，开始下次和感光鼓 104之间的 再次印刷， 当转印带 1 07转动时， 清洁装置 115把转印带 107上的未转印下去 的墨粉干净。
当墨粉被转印到工件 112上后， 可以移动开整个上面的成像转印装置， 或 通过载物平台 11 3下降或移动开，然后由定影装置 1 11沿工件表面以一定的温 度和压力滚过工件 112表面， 使停留在工件表面的墨粉被加热融化， 固定在工 件表面。
载物平台 113和上面转印系统能做上下左右的相对运动， 载物平台 113表 面可以被施加一个和墨粉电荷极性相反的直流偏压， 以帮助墨粉的分离。
本发明的实施例 2 , —种静电干粉式移印装置， 其原理图如图 2所示， 图中 201是一个升降驱动装置，可将二次转印平板 202升降， 同时可沿轴 209运动， 207是转印带， 203是转印带张紧装置， 204是转印带清洁装置， 208是转印带 冷却装置， 205是被印刷工件， 206是载物平台。
和附图 1 不同的是， 本方案釆用一个被施加了和电荷极性相同的直流偏压 相同的平板， 当转印带带着墨粉停留在物体上方时， 升降装置 201将二次转印 平板 202压下， 使转印带靠近或接触物体， 然后施加和电荷极性相同的直流偏 压，这时墨粉由于同性相斥的原理被转印到工件 205上，然后升降驱动装置 201 提起二次转印平板 202 , 由于张紧装置 203的作用， 转印带同时离开工件， 墨 粉就被留在工件 205上了， 然后转印带可以再次旋转去转印感光鼓上的墨粉。
如果需要， 二次转印平板 202也可以做成小于最大印刷尺寸， 当被升降驱 动装置 201压下抬起后， 可沿轴 209平移， 然后再次压下抬起。
同时， 作为一种备选的方案， 平板 202 可以内置一个加热装置， 在被压下 的同时，除了使用直流偏压排斥墨粉外，同时将转印带表面涂有耐沾耐热材料， 例如特富龙类的物质， 使墨粉除了被偏压排斥外， 还由于墨粉被加热融化时对 不同物质的粘接力不同，从而更有利于墨粉的分离和提高生产效率。当平板 202 离开工件时，转印带再次转动，清洁装置 204将残余的墨粉清除，冷却装置 208 降低转印带 207的温度， 使他在连续工作时保持在一个适宜的温度。 同样的道 理也适用于附图 1中二次转印辊 110含有加热装置。 载物台 206和附图 1的载物台 113性质相同。
本发明的实施例 3 ,—种静电干粉式移印装置，其原理图如图 3所示，图中， 301是曝光装置， 302是感光鼓， 303是显影装置， 304是充电装置， 305是清 洁装置， 306是转印带， 307是一次转印棍， 308是转印带驱动装置， 309是定 影装置， 311是转印带清洁装置， 310是二次转印装置， 314是消静电装置， 312 是工件， 313是载物平台。
在本方案中， 载物平台 313和上面的成像定影装置间可相对运动， 其运动 速度正好和转印带和感光鼓之间的成像速度相同。 当感光鼓上形成图像的同 时， 转印带上的图像也被同步的转印到工件上， 同时带动定影装置 309同步定 影。 这样通过载物平台 313和成像定影装置之间的相对运动， 可以无间断的实 施工件印刷。 和附图 1和 2的工作不同的是， 这个方案中成像定影装置和载物 平台是可以相对运动的， 转印带和定影装置在工作中同步不停顿。
本发明的实施例 4 , 一种静电干粉式移印装置， 其原理图如图 4所示， 图中 401是导轨， 402是升降驱动装置， 403是一个金属板，表面镀有绝缘弹性不沾 层， 405是感光鼓， 404是显影装置， 406是曝光装置， 407是充电装置， 408 是清洁装置， 409是清洁和消静电装置， 410是 409的升降装置， 411是冷却装 置， 412是 411的升降装置。 414是被印刷工件， 413是载物平台。
在位置 A时， 感光鼓通过充电， 曝光， 显影形成墨粉图像， 这时转印板 403 被施加一个和墨粉电荷相反的直流偏压， 它的绝缘层和感光鼓想接， 它在驱动 装置 402的驱动下， 沿导轨 401运动， 方向和速度和感光鼓旋转方向和线速度 相同，感光鼓上的墨粉由于转印板 403上的和墨粉电荷极性相反的直流偏压的 吸引，被吸附在转印板 403的绝缘层上，在驱动装置 402的驱动下，转印板 403 沿导轨 401从位置 A向位置 B运动，这时清洁装置 409和冷却装置 411被升降 装置 410和 412降下， 不和板 403接触。
当板 403运动到位置 B时， 正好在被印工件 414上方， 这时驱动装置 402 停止， 同时向下降下板 403和工件 414接触， 这时金属板上的电压被转换成一 个和墨粉电荷极性相同的直流偏压， 将墨粉排斥到工件 414上， 作为辅助， 载 物平台 41 3上，可以施加一个和电荷极性相反的直流偏压，协助吸引墨粉分离， 然后驱动升降装置 402提起板 403离开工件 414 , 停止直流偏压， 同时向位置 A移动。 然后由定影装置来对工件 414定影。 作为一种选择， 板 403内也可以 考虑同时增加一个加热装置， 在转印的同时定影。
当板在向位置 A运动时， 升降装置 41 0和 412把清洁消静电装置 409和冷 却装置 411升起（如果不加热， 可以不需要冷却装置 411 ), 当板 403通过清洁 消静电装置 409和冷却装置 411的时候，会和它们接触，将未清洁的墨粉除去， 消去板上静电。 同时对板 403冷却到一个合适的温度。
当板回到位置 A后， 就可以开始下次印刷。
本发明利用小幅面的激光打印机进行大幅面打印的实施例， 其原理说明图 如图 5和图 6所示， 图中： 501可以是上述实施例中的任意一静电干粉式移印 装置， 502和 503是 Χ, Υ方向的导轨， 504是被印物体， 505是预计的图像在电 脑中被分成了多个小图， 每个字母代表一个小图， 其中每个小图的幅面小于或 等于静电干粉式移印装置 501所能印的最大图案。 当静电干粉式移印装置 501 开始工作时， 它可以沿导轨 502和 503做 Χ, Υ方向的运动， 因此当它印小图 A 时， 它可以先运动到被印工件 504上 A需要在的位置上方， 让后印 A, 然后移 动到位置 B的上方， 印图案 B, 通过这样多次对多个图案的印刷， 使图案 505 被完全印在被印工件 504上。
本发明利用小幅面的激光打印机进行大幅面打印的另一实施例， 其原理说 明图如图 7和图 8所示， 图中： 601是预计的图像在电脑中被分成多个小图， 每个图像小于或等于打印机 602所能印的最大图案， 602是包括曝光， 充电， 显影， 清洁等装置的集成， 608是感光鼓， 装在集成 602内， 603是个导轨， 602可沿 603运动， 604是转印带， 605是转印带驱动装置， 607是转印棍。 首 先集成 602沿导轨 603运动到转印带印图像 A的位置，然后驱动装置 605驱动 转印带 604旋转，通过转印棍 607依次把图像 A, C, E, G印在转印带上相应的位 置上，然后集成装置 602沿导轨 603运动到印图像 B的位置停止，驱动装置 605 驱动转印带 604 , 依次把图像 B, D, F, H印在转印带上， 形成完整的图像 601 , 然后驱动装置把转印带转动到图像正对被印物体 606上， 利用附图 1 , 2 , 3所 述的方法转到物体上去。
上述实施例中未对其中的装置如静电成像， 清洁， 冷却， 消静电等方法做 详细说明，同时也未对各种方法的激光或 LED彩色或单色静电打印做详细说明， 由于这些都是已知科技， 本领域人员应能理解， 同时， 使用不同的方法来完成 本发明中的彩色静电打印， 加热， 清洁， 冷却， 电荷处理等， 只要是已知科技 的， 都应包含在本发明内。
传统的对物体彩色印刷， 主要有丝印， 移印， 喷墨等方法， 前二者需要制 版， 且印刷效果有局限， 后一种需要对物体表面做涂层， 且效率低下。 和上述 方法相比， 本发明无需制版， 无需涂层， 效果虽不如喷墨，但好于丝印和移印， 同时速度比喷墨快几十倍， 其不需要向喷墨一样做涂层， 且目前的精度也能达 到照片级别， 特别需要说明的是， 在非纸张印刷中， 白色对喷墨来说一直是个 难点， 要满足覆盖率和不堵塞喷头， 目前没有被理想的解决， 而对静电打印来 说， 白色墨粉是容易制造和实施的。 所以本发明对物体的印刷综合性能好于喷 墨， 是未来平板印刷的发展方向。 本发明的另一实施例， 如图 9所示， 图中， 801是彩色激光打印机， 802是 将图像从彩色激光打印机 801转印到转印带上的系统， 803是定影系统， 804 是可升降和前后运动的载物平台。
图 10、 11、 12、 1 3是对系统 802的详细介绍， 其中 901是转印棍， 902是 转印带， 903是清洁装置， 904是托带棍， 905是弹簧， 906是 2次转印棍， 907 是转印带张紧装置， 908是转印带托带棍， 909是光栅带， 911是转印带夹紧拖 动头， 91 0是装在 911上的， 用来读取光栅带 909上位置的传感器， 912是起 始位置传感器， 91 3是结束位置传感器， 914是传动丝杆， 915是传动电机， 915 通过齿轮 916带动丝杆 914 , 914和夹带装置 911相连， 928是 2次转印支架， 他的两端通过直线轴承 930和滑轨 921相连， 938是电磁铁， 负责升降转印棍 906沿滑管 931升降， 905是弹簧， 927是和二次转印支架 928相连的丝杆， 925 是电机， 通过齿轮 926驱动丝杆 927 , 带动转印支架 928运动， 917是起始位 置光电传感器， 919是遮光片， 929是结束位置传感器。 932是消静电装置。 918 是电机， 923是滑轨， 924是和电机 918相连的丝杆， 用来驱动整个装置 802 , 922是起始位置传感器， 933是结束位置传感器。
附图 14是对彩色激光打印机 801的详细介绍， 1 001是激光头， 1002是粉 鼓一体化装置， 1 003是转印棍， 1004是转印带。
附图 15、 16是对定影系统 803的详细介绍， 1101是电机， 和丝杆 1107相 连，通过丝杆套 1111和定影支架 1110相连， 1110被安装在导槽 1104内， 1112 是定影支架 1110和定影棍支架 111 3相连的滑管， 1108是弹簧， 1106是升降 电磁铁， 1 103是起始位置传感器， 1105是结束位置传感器， 1102是遮光片。
附图 17、 18是对升降载物台 804的详细介绍， 1210是载物平台，被安装在 升降台 1211的滑槽 1205上， 1206是电机， 和丝杆 1207相连， 1209是起始位 置传感器， 1208是结束位置传感器， 1202和 1227是和升降台 1211相连的丝 杆， 1201和 1226是外套皮带轮的丝杆套， 1204和 1205是电机， 1204和电机 1225装有同步装置的的电机， 1203和 1228是传动皮带， 1222是起始位置传感 哭口
本机的工作过程是这样的， 首先， 电机 918带动丝杆 924转动， 使整个装 置 802沿滑管 923运动， 和清洁装置 903以及激光打印机 801分开， 当传感器 922检测到 802和它不接触且达到位置传感器 933时， 电机 918停止。
然后打印机 801开机自检， 这时电机 915转动， 通过齿轮 916 , 带动丝杆 914转动， 将转印带夹紧支架 911向起始位置传感器 912方向运动， 当起始位 置传感器 912检测到转印支架 911后， 电机停止。 同时二次转印装置中， 电磁 铁 918不工作， 在弹簧 905的作用下， 2次转印棍 906被沿滑管 931顶起， 和 转印带 902不接触， 同时电机 925带动齿轮 926 , 驱动丝杆 927转动， 带动二 次转印支架 928向位置传感器 917运动， 当位置传感器 917检测到遮光片 919 后， 电机 925停止。
于此同时， 定影装置 803中， 电磁铁 11 06不工作， 在弹簧 1108的支撑作 用下， 定影棍 1109被沿滑槽 11 12被顶起到最高位置。 同时电机 1101转动， 带动丝杆 1107 , 通过丝杆套 11 11带动支架 1110到起始位置传感器 1103处， 电机停止。
被印刷的物件被放置到平台 1210上，这时通过调节电机 1206 ,使物件要印 刷的起始位置到达转印带 902下， 调节电机 1204和 1225 , 使物体升高或降低 到和转印带 902下一个合适的高度处。
当激光打印机自检完毕后， 通过电脑向激光打印机 801发送打印命令， 通 过激光器 1001 , 分别在各色粉鼓一体装置 1002上形成图像， 然后通过转印棍 1003依次印到一次转印带 1004上， 这时， 根据预先设定好的程序， 当彩色图 像形成在转印带上的时候， 电机 918带动丝杆 924 , 向位置传感器 922方向运 动， 使整个装置 802运动和清洁装置 903以及转印带 1004接触， 当位置传感 器 922检测到装置 802运动到位时， 电机 924停止， 这个时刻是被预先设计， 恰好是转印带 1004和二次转印带 902接触时，转印带 1004上的图像即将到达 接触点的位置， 这时电机 915工作， 通过齿轮 916 , 驱动丝杆 914转动， 带动 转印带夹紧支架 911向位置传感器 913方向运动， 同时传感器 910检测光栅带 909读数， 反馈给电机 915 , 使电机 915驱动转印带夹紧支架 911拖动转印带 的速度， 和转印带 1004的速度相同， 当被清洁装置 903清洁过的转印带 902 到达转印棍 901时， 这时转印带 1004的图像被预先设计的也恰好到达， 这时 给转印棍施加一个和墨粉极性相反的电压， 转印带 1004上的墨粉， 被转印到 转印带 902上， 当图像被转印完成后， 转印棍 901停止被加压， 电机 918带动 丝杆 924驱动整个装置 802向位置传感器 933方向运动， 到达位置传感器 933 时， 电机 915停止， 这时转印带和清洁装置 903分开， 电机 915这时反向带动 丝杆 914 , 驱动转印带 902向位置传感器 912方向运动， 传感器 910检测光栅 带 909的读数，当确定转印带上的图像在要印物体的上方合适位置时，电机 915 停止，在这个过程中， 由于转印带再次通过转印棍 901 , 可以考虑对转印棍 901 施加一个合适的电压， 以增强墨粉的带电性能， （不是必须， 只是对某些要印 物体有用）。
当带有墨粉图像的转印带到达待印物体的上方时， 电磁铁 938工作， 将转 印棍 906压下， 由于 907是带有弹簧的张紧轮， 这时转印带 902被 906压下的 地方接触待印工件， 这时电机 925工作， 带动齿轮 926 , 驱动丝杆 927向位置 传感器 929方向运动， 同时给转印棍 906上施加一个和当前墨粉电荷极性相同 的电压， 使转印带上的墨粉被排斥到工件上， 作为一种补充手段， 平台 1210 上也可以考虑被施加一个和墨粉极性相反的电压， 来帮助墨粉分离吸附。 转印 带 902靠张紧轮 907提供的张力和待印物体分离，二次定影支架上的消静电装 置 932提供对转印带 902上多余静电的消除， 协助分离和下次印刷。 电机 925 可以被设计成伺服或步进电机，当要转印的图像完成后，电磁铁 938停止工作， 在弹簧 905的作用下， 转印棍 906被顶起， 和转印带 902不接触， 同时停止加 压， 在电机 925的反方向带动下， 回到起始位置。
这时， 在电机 1206的驱动下， 平台向前运动到定影装置 803下， 这时， 电 磁铁 1106工作，压下定影棍 1109 , 定影棍 1109是一个带有温控加热装置， 表 面涂有不沾性材料的弹性棍，这时电机 1 101带动丝杆 1107转动，驱动支架 1110 向前运动， 定影棍 1109从待印物体表面加压加热滚过， 使墨粉在待印物体表 面被固化。 当通过要定影的图像完毕， 电磁铁停止工作， 弹簧 1 108将定影棍 1109顶起， 和物体表面脱离， 回到起始位置。 印刷完成。
在这个过程中， 打印机如果釆用市场上销售的 A3或 A4打印机改制， 当需 要印刷超过这个幅面的图时， 可以釆用附图 5或 6的方法进行拼图， 也可以将 要印刷的多个图案一次连续转到二次转印带上， 虽然每个图像之间有间隔， 但 是，由于在这个设备加装了光栅定位装置，也可以依次将每个图案转印到工件， 具体是， 先把其中一个图案转到物体上， 然后提起二次转印装置， 移动转印带 到平行的对齐位置， 在下降转印， 把多个横向的图案拼接完成后， 载物平台向 前运动， 接着用同样的办法完成第二排， 依次类推， 直到完成全部图案， 这种 办法的好处在于， 市场上销售的激光打印机， 印单张的速度很慢， 但连续印很 快， 这样做效率会很高， 缺点是转印带需要很长， 装置体积会比较大。
在本实施例中， 传动方式不仅限于丝杆， 其他合适的机械传动方式均可以 考虑， 如同步带等， 离合方式不仅限于电磁铁， 凸轮或其他的已知机械离合方 式都可以考虑。 所述的定影装置， 可以考虑釆用目前已知的各种的方式替代， 如定影膜的方式。
在本实施例中， 所述的激光打印机， 除了普通的 CMYK四色方式外， 也可以 根据需要， 釆用白色 +红色 +蓝色 +黄色， 或白色 +CMYK的方式。如果釆用市场销 售的打印机改制， 推荐釆用一台单色激光打印机， 釆用白色墨粉和一台彩色激 光打印机组合的方式， 结构上釆用先转印白色， 让后再转印彩色。 如图 19所 示， 其中 1 301和 1 302是如本实施例中所述的静电移印机， 其中 1 301是白色 机， 1 302是彩色机， 1 303是工件， 1 304是传送装置， 物件首先被送到白色机 1 301下印上白色，然后被传送装置 1 304送达彩色机 1 302下被印上彩色。 以满 足对深色物体的印刷。
实施例 2 : 在本实施例中， 载物平台和定影装置和实施例 1相同， 不同之处 在于成像转印方面。
附图 20、 21是本装置的成像转印组件。 其中 1401是激光器， 1402是粉鼓 总成， 1403是转印带， 1404是图像传感器， 1405是拖带轮， 1406是传动带， 1407是电机， 1419是转印棍， 1408是二次转印驱动电机， 1409是丝杆， 1410 是二次转印棍的升降装置， 由丝杆 1409驱动前后运动， 141 3是二次转印棍， 1421是消静电装置， 1415是待印物体， 1416是载物平台， 1414是转印带张紧 轮， 1417是弹簧， 1418是张紧轮的支杆， 1411是清洁装置， 1412是拖带轮， 1420是转印带位置传感器。
在本例中， 由于二次转印装置和载物平台和实施例一类似， 所以不在做详 细的结构图介绍。
本实施例的工作方式是， 当计算机发出打印命令后， 激光器 1401和鼓粉总 成 1402通过转印棍 1419把图像印在转印带 1403上， 形成彩色图像， 转印带 的运动方向是从清洁装置 1411的方向向图像检测装置 1404方向运动， 由电机 1407带动拖带轮 1405提供动力，转印带是一个闭合的带子，在转印带的边上， 不是图像印刷区的一侧， 印有一定间隔的白点， 转印带位置检测装置 1420在 这些白点要通过的位置正上方， 是一个光电反射检测装置， 通过检测白点来检 测转印带的运动速度， 来控制电机 1407的转动速度， 1404是一个光电反射检 测装置， 用来确定图像的起始位置和自检时矫正图像位置。 当图像被印到转印 带 1403上后， 在电机 1407的驱动下， 拖带棍靠摩擦力带动转印带在本图中逆 时针旋转， 图像被转到待印工件 1415的上方， 通过图像检测传感器 1404和转 印带位置传感器 1403 所得到的信息反馈， 电机 1407在图像被转动到要工件 1415上方时停止， 然后二次转印升降装置降下二次转印棍 141 3和消静电装置 1421 , 把转印带 1403压向工件表面， 在张紧轮 1414的作用下， 除二次转印棍 下方的带子外，其他的转印带不和工件 141接触，当电机 1408牵动转印棍 141 3 向本图的左方运动时， 转印棍 141 3被施加了一个和转印带上墨粉极性相同的 电压， 将墨粉从转印带排向工件表面， 同时， 消静电装置 1421对转印带上多 余的静电消除， 在张紧轮 1414的张紧力下， 没有被二次转印棍压着的带子和 工件分离， 当图像被转印完后， 二次转印升降装置 1410提起转印棍 141 3 , 使 它和转印带不接触， 转印带 1403在张紧轮 1414的牵动下也和工件 1415不接 触。 同时停止施加在转印棍 141 3上的电压， 在电机 1408的驱动下， 回到初始 位置。 这时转印带 1403在电机 1407的驱动下， 开始下次印刷， 在转印带上残 存的墨粉， 随着转印带的转动， 被和拖带轮 1412紧密接触的清洁刮板 1411刮 下， 载物平台 1416将工件 1415传送到定影装置下定影。
在本实施例中， 印刷白色图像和用小图拼接大图的方法和实施例一相同。 本说明书中公开的所有特征， 或公开的所有方法或过程中的步骤， 除了互 相排斥的特征和 /或步骤以外， 均可以以任何方式组合。
本说明书 （包括任何附加权利要求、 摘要和附图） 中公开的任一特征， 除 非特别叙述， 均可被其他等效或具有类似目的的替代特征加以替换。 即， 除非 特别叙述， 每个特征只是一系列等效或类似特征中的一个例子而已。
本发明并不局限于前述的具体实施方式。 本发明扩展到任何在本说明书中 披露的新特征或任何新的组合， 以及披露的任一新的方法或过程的步骤或任何 新的组合。

Claims

权 利 要 求 书
、 一种静电干粉式移印装置， 其特征在于， 该装置包括可以在感光鼓和被 印物体间运动的转印载体， 在转印载体上有用于吸附墨粉的转印面， 当 转印面朝向感光鼓时， 感光鼓上的墨粉转印到转印面上， 在转印载体上 还有一个电荷加载装置， 当转印面位于被印物体上方时该电荷加载装置 在转印面背面加载与墨粉所带电荷极性相同的电压。
、 根据权利要求 1所述的静电干粉式移印装置， 其特征在于， 所述的转印 载体包括一个转印带， 和驱动转印带循环转动的转印带驱动装置。
、 根据权利要求 1所述的静电干粉式移印装置， 其特征在于， 所述的转印 载体包括一个可以在感光鼓和被印物体间移动的转印板。
、 根据权利要求 1至 3之一所述的静电干粉式移印装置， 其特征在于， 所 述的电荷加载装置是一个位于被印物体上方， 在转印面背面的转印棍。 、 根据权利要求 1至 3之一所述的静电干粉式移印装置， 其特征在于， 所 述的电荷加载装置是一个位于转印面背面， 可以附加与墨粉电荷相同极 性的直流偏压的金属板， 该金属板可以沿垂直于转印面的方向移动。 、 根据权利要求 1所述的静电干粉式移印装置， 其特征在于， 在转印载体 上还具有静电消除装置。
、 根据权利要求 1至 3之一所述的静电干粉式移印装置， 其特征在于， 在 被打印物体表面的物体另一面还设置一个有第二电荷加载装置， 施加一 个和墨粉电荷极性相反的直流偏压。
、 根据权利要求 1至 3之一所述的静电干粉式移印装置， 其特征在于， 本 装置还包括一个对打印物体表面施加和墨粉电荷极性相反电荷的第二电 荷加载装置。
、 根据权利要求 8所述的静电干粉式移印装置， 其特征在于， 所述的第二 电荷加载装置是电晕丝或充电辊。
0、 根据权利要求 2或 3所述的静电千粉式移印装置， 其特征在于， 所述的 电荷加载装置上还设有用于定影的加热装置。 、 根据权利要求 10所述的静电干粉式移印装置， 其特征在于， 在电荷加载 装置旁边还设有对转印载体进行冷却的冷却装置。
、 根据权利要求 1所述的静电干粉式移印装置， 其特征在于， 该移印装置 还包括定影装置， 定影装置是对物体表面有墨粉的地方来实施加热的激 光加热器。
、 根据权利要求 2所述的静电干粉式移印装置， 其特征在于， 所述的转印 带 , 是镀有与墨粉具有不沾性材料的聚亚酰胺薄膜带。
、 根据权利要求 1所述的静电干粉式移印装置， 其特征在于， 所述的转印 载体包括一个可以在感光鼓和被印物体间移动的转印板， 所述的电荷加 载装置是一个位于被印物体上方， 在转印面背面的转印棍， 该静电干粉 式移印装置还包括一定影用的定影辊或板， 所述的转印棍或转印板以及 定影辊或板， 在表面涂敷有弹性材料以及与墨粉具有不沾性的材料。 、 一种通过使用权利要求 1所述设备来实现用小幅面激光或 LED打印机进 行大幅面打印的方法， 其特征在于， 包括以下步骤： 将要打印的图案按 所釆用的打印机的幅面限制， 分成不超过这个幅面限制的多个小图， 然 后依次转印到静电干粉式移印装置中的转印载体上， 在转印载体上拼接 成一个完整图像， 然后由转印载体一次转印到物体表面。
、 一种通过使用权利要求 1所述设备来实现用小幅面激光或 LED打印机进 行大幅面打印的方法， 其特征在于， 包括以下步骤： 将要打印的图案按 所釆用的打印机的幅面限制， 分成不超过这个幅面限制的多个小图， 由 转印载体每次将一个局部的小图块转印到被印物体上， 然后移动物体或 转印带， 依次转印各个图块到和整图对应的位置， 实现大幅面的打印。
PCT/CN2011/077009 2010-07-09 2011-07-09 静电干粉移印装置以及用该装置实现大幅面打印的方法 WO2012003807A1 (zh)

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