JP2754624B2 - Electrostatic transfer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic transfer device used in an image forming apparatus such as an electrophotographic copying machine.

2. Description of the Related Art For example, in an image forming apparatus such as an electrophotographic copying machine to which the principle of xerography is applied, an electrostatic latent image is formed by exposing a uniformly charged image carrier (hereinafter, represented by a photoconductor). The electrostatic latent image is developed with a charged toner to form a toner image, and the toner image is further transferred to a transfer material (hereinafter, represented by paper).
The image is transferred and fixed to obtain a copy. By performing latent image formation, development, and transfer on the same sheet for each color component in these series of steps, full-color copying can be performed. The electrostatic transfer device is used to transfer a sheet to a predetermined transfer position at a predetermined timing in synchronization with a photoreceptor in a device such as a full-color copying machine that requires multiple transfer as described above. Is done.

FIG. 14 is a view showing an example of a conventional electrostatic transfer device. As shown in FIG. 15, a semiconductive resin film 4 having a plurality of electrodes 2 arranged on one side thereof at regular intervals is supported on a rigid drum (not shown) to form a transfer drum 6, and the transfer drum 6 is placed at a transfer position. To contact the photosensitive member 8 of the same diameter as
Transfer power supply means 10 for supplying a voltage having a polarity opposite to that of the toner to the electrode 2 moved to the transfer position.
Among them, a paper suction power supply unit 12 for alternately supplying a high voltage (for example, a positive voltage) and a low voltage (for example, a ground potential) to the electrode 2 moved to the paper transport position is provided. Since the latent image formation and development are performed for each color component each time the photoconductor 8 makes one rotation, the paper carried in the direction of arrow A and attracted onto the transfer drum 6 has the same original color every time it passes the transfer position. The transfer of toner images of different colors is performed on the image. Then, the sheet on which the toner images of three or four colors are multiplex-transferred is discharged in the direction of arrow B by releasing the sheet suction power supply unit 12 or the like.

FIG. 16 is a view showing another example of the conventional electrostatic transfer device. In this conventional example, the resin film 4 is formed in an endless belt shape and is mounted on at least two rollers 14 and 16, and a plurality of photoconductors 8 on which a latent image is formed and developed for each color component are formed on the resin film 4. The transfer power supply means 10 and the paper suction power supply means 12 are provided in contact with the flat portion and corresponding to the arrangement of the resin film 4 and the photoconductor 8. The paper carried in the direction of the arrow A and adsorbed on the flat portion of the resin film 4 is subjected to multiple transfer of toner images of respective colors from the respective photoconductors operating in synchronization with the movement of the paper. The sheet is peeled off by using the waist of the sheet and discharged in the direction B.

FIG. 17 is a diagram showing a specific configuration example of the transfer power supply means 10. As shown in FIG. The transfer brush 16 is slid on the electrode 2 moved to the transfer position, and the potential of the transfer brush 16 is adjusted by the transfer power supply 18 when the polarity of the toner on the photoconductor 8 is, for example, minus. It is configured with a potential. Photoconductor 8
Since an electric field is formed between the transfer brush 16 and the electrode 2 with which the transfer brush 16 is in contact, the toner on the photoreceptor 8 is transferred to the sheet P at the transfer position along the electric field.

FIG. 18 is a diagram showing a specific configuration example of the paper suction power supply unit 12. As shown in FIG. The suction brush 20 sliding on the electrode 2 is applied to the resin film 4.
Are provided alternately with respect to the moving direction, and these are alternately connected to the plus side and the minus side of the suction power supply 22. The paper P is moved by the electric field formed between the electrode groups on which each brush slides. It adsorbs to the resin film 4.

Problems to be Solved by the Invention In the conventional electrostatic transfer device shown in FIG. 14 or FIG. 16, the suction force for the paper once adsorbed on the resin film is sufficient, but the conveyed paper However, the adsorbing force at the sheet adsorbing position where the sheet is adsorbed to the resin film for the first time is not always sufficient, and the conveyed sheet may not be sufficiently adsorbed by the resin film and may cause a paper jam or the like.

The present invention has been created in view of such a problem,
It is an object of the present invention to provide an electrostatic transfer device that can satisfactorily attract a sheet to a resin film at a sheet attracting position.

Means for Solving the Problem A first means for solving the technical problem described above is:
A sheet to which a toner image of a photoreceptor is transferred at least at a transfer position while being in close contact with the outer surface; a plurality of electrodes arranged at regular intervals inside the resin film; A transfer power supply unit that contacts the electrode that has moved to the transfer position among the electrodes and supplies a voltage having a polarity opposite to the polarity of the toner. In an electrostatic transporting transfer device including a paper suction power supply unit for supplying a voltage and a low voltage, a conductive roll is rotatably abutted on the resin film from the paper suction side at a paper suction position. The electric potential of the conductive roll is different from the electric potential of the electrode corresponding to the contact position between the conductive roll and the resin film.

Here, the high voltage and the low voltage are relatively +
It means the voltage on the (plus) side and the voltage on the-(minus) side relatively (the same applies hereinafter). Therefore, specific combinations of high voltage and low voltage are + 2000V, + 500V, and + 1500V
And 0V, + 1000V and -500V, 0V and -1500V, -500V and -2000
V etc.

The second means includes a semiconductive resin film formed in an endless belt shape, which moves the paper on which the toner image of the photoreceptor is transferred at least at a transfer position while being in close contact with the outer surface; A plurality of electrodes arranged in parallel at regular intervals on the inside, at least two rollers on which the resin film is mounted, and contacting the electrode that has moved to the transfer position among the electrodes, and having a polarity opposite to the polarity of the toner. A static power supply comprising: a transfer power supply for supplying a voltage; and a paper suction power supply for contacting an electrode, which has been moved to the paper transport position, among the above-mentioned electrodes and supplying a high voltage and a low voltage alternately. In the electro-transfer transfer device, of the rollers, all or a part of the portion of the roller that contacts the electrode of the roller corresponding to the sheet suction position is formed of a conductor, and the potential of the conductor is closest to the conductor. Paper at position Wear feeding means in which is so different from the potential of the electrodes in contact.

The third means includes a semiconductor resin film formed in an endless belt shape, which moves the paper on which the toner image of the photoconductor is transferred at least at the transfer position while being in close contact with the outer surface; A plurality of electrodes arranged side by side at regular intervals, at least two rollers on which the resin film is mounted, and a voltage having a polarity opposite to the polarity of the toner, which is in contact with the electrode moved to the transfer position among the electrodes. And a feeding power supply unit for feeding paper, which is in contact with one of the electrodes that has been moved to the paper transport position and alternately supplies a high voltage and a low voltage. In the conveyance transfer device, an auxiliary roller is rotatably abutted on the resin film wound around a roller corresponding to a sheet suction position among the rollers.

According to the first means, the conductive roll having a potential different from the potential of the electrode at the paper suction position is brought into contact with the resin film. When passing through the gap, the electric charge is injected from the conductive roll, and the paper suction force increases. That is, the attraction force between the paper and the resin film at the position where the loaded paper first adheres to the resin film is determined according to the strength of the formed electric field and the amount of electric charge of the paper placed in the electric field. According to the configuration of the present invention, by applying a stable electric field, a sufficient charge is supplied to the sheet from the conductive roll by the potential difference, and the sheet attracting force is increased. Further, since the conductive roll is rotatably brought into contact with the resin film, the paper is mechanically made to conform to the resin film, which also increases the paper suction force.

According to the second means, the entirety or a part of the portion in contact with the electrode is made of a conductive material, and the potential of the roller contacted by the paper suction power supply means at the position closest to the conductive material is adjusted. Since the potential is made different from the potential, an electric field is formed between the conductor and the approaching electrode, that is, the conductor acts as a part of the sheet suction power supply means, and the sheet is attracted to the resin film on the roller. Power increases.

According to the third means, the auxiliary roller is rotatably brought into contact with the resin film wound around the roller, so that the conveyed paper is mechanically moved when passing between the resin film and the auxiliary roller. The sheet is held along the resin film, and the sheet suction force increases.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall configuration diagram of an electrostatic transfer device showing a first embodiment of the first means, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. Is a partial perspective view of the transfer drum shown in FIG. 5, and FIG. 5 is a power supply connection diagram of the brush power supply device shown in FIG.

In FIG. 1, reference numeral 30 denotes a photoreceptor on which an electrostatic latent image formed on the surface is subjected to black and white or color development by a developing device (not shown), and 32 is provided so as to abut on the surface of the photoreceptor 30 at a transfer position. Transfer drum 34, a brush power supply device for supplying power to the electrodes of the transfer drum 32, and 36 a paper feed tray
A feed roller for feeding the paper 40 placed on 38 in the direction of the transfer drum 32, a peeling claw 42 whose tip is provided to be able to freely contact and separate from the transfer drum 32 at a peeling position, and 44 is a peeling claw This is a transport belt that sends the peeled sheet in the direction of a fixing device (not shown). The transfer drum 32 to which the leading edge of the paper fed by the feed roller 36 first adheres
A conductive roll 46 is rotatably in contact with the upper position (paper suction position), and the conductive roll 46 is grounded via a conductive shaft 50. 48 is a conductive roll
A solenoid that supports the conductive roll 46 so that the contact between the transfer drum 32 and the transfer drum 32 can be released. The contact state can be released in this way because the toner image is formed when the sheet once adsorbed on the transfer drum 32 passes through the conductive roll 46 and the transfer drum 32 after being transferred. This is to prevent disturbance.

As shown in FIG. 3, the transfer drum 32 includes a rigid drum 52 made of metal or the like, an insulating support member 54 provided on the outer periphery of the rigid drum 52, and a plurality of transfer drums 32 provided at regular intervals on the support member 54. It comprises a strip-shaped electrode 56 and a semiconductive resin film 58 adhered to the support 54 and the electrode 56 so that the vicinity of the end of the electrode 56 is exposed. Here, a semiconductive resin film
58, acrylic, polyvinyl chloride, polyester, a resin such as polypropylene or various rubbers contain an appropriate amount of an antistatic agent such as carbon black, and the volume resistivity is 10 ⁸ to 10 ¹² Ω.
Cm, and the thickness is, for example, 0.25 mm. The electrode 56 can be formed on the support 54 by a normal conductive pattern forming technique such as etching or screen printing, and has a width of about 0.5 mm. For example, the fourth
As shown in the drawing, a 35 μm thick Cu electrode 56a is formed by etching on a 50 μm thick support 54 made of polyester, and a Ni electrode 56b is formed on the surface of the Cu electrode 56a for the purpose of preventing oxidation and improving abrasion resistance. When formed at a thickness of 2 to 3 μm, it is possible to provide a transfer drum that can sufficiently withstand long-term use. When the distance between the electrodes is 1 mm or more, an electrode pattern (a phenomenon in which a high density portion or a low density portion is generated in a transferred image due to the electrode pitch) tends to be generated. Approximately 0.5 mm is optimal because secondary failures such as short circuits occur. Support 5
4 is made of an elastic body having a hardness (JIS K6301) of 50 mm or less, or by interposing an elastic layer (not shown) of the same quality between the support 54 and the rigid drum 52, so that the contact force between the transfer drum and the photoconductor is increased. Can be stabilized, and the transfer efficiency can be stabilized. In FIG. 3, the reason that the vicinity of the end of the electrode 56 is exposed is to supply power to one side of the transfer drum 32 by a brush power supply device described below.

As shown in FIG. 2, the brush power supply device 34 is provided so as to cover the electrode exposed portion of the transfer drum 32, and a power supply brush for performing various functions is provided inside the transfer drum 32 in the circumferential direction. They are arranged alternately in rows. The brush power supply device 34
Since the function differs depending on the position in the circumferential direction, for convenience, as shown in FIG.
And a first transport unit 34b corresponding to the paper transport position, and a second transport unit 34c inserted upstream of the paper peeling position in the first transport unit.

The power supply connection of each part of the brush power supply device will be described with reference to FIG. In the figure, the brush feeding device 34 is connected to the first transport portion 34b.
This corresponds to an exploded plan view broken between the second transport section 34c and the second transport section 34c (A section in FIG. 1). In the transfer unit 34a, 60
Is a transfer brush, and is a transfer power supply via a switch 62.
The negative side of the transfer power supply 64 is grounded. According to this configuration, a constant voltage can always be supplied to the electrode that has moved to the transfer position as the transfer drum rotates. A transfer auxiliary brush 66 is provided on both sides of the transfer brush 60. By grounding this, the electric field in the transfer section can be stabilized, and good transfer quality can be obtained. it can. That is,
Generally, the transfer is performed by moving the charged toner particles on the photoreceptor along the lines of electric force that form the transfer electric field. Can be prevented from being transferred before moving to the transfer position, and defects such as blurring of the transferred image are less likely to occur. In the first transport section 34b, reference numeral 68 denotes a first suction brush, which is alternately connected to the switch 70 and the ground section. 72 is a switch
It is a first power supply for suction provided between 70 and a ground part. Second
In the transport unit 34c, reference numeral 74 denotes a second suction brush, which is alternately connected to the changeover switch 76 and the ground unit. The changeover switch 76 switches between connection to the positive side of the second suction power supply 78 whose grounded side is grounded and connection to the grounding section.

Conventionally, since the brush power supply is performed from the inside of the transfer drum, the wiring connection is extremely complicated. However, if the brush power supply is performed from the outside of the transfer drum as in this example, maintenance is required. As a result, the degree of freedom of wiring increases. Also, since the brush power supply device is provided on one side of the transfer drum, the device can be made compact. Further, compared to the case where the brush power supply device is divided on both sides of the transfer drum, it is not necessary to adjust the pitch between the brushes.

Hereinafter, the operation of the device of the present embodiment will be described. Transfer drum
When the switch 70 is turned on with the rotation of the transfer drum 32, the electrode 5 corresponding to the first transport unit 34b is rotated with the rotation of the transfer drum 32.
6, the potential changes repeatedly as plus, floating, earth, floating, plus,..., An electric field is formed between the electrode group connected to the plus portion and the ground portion, and the paper can be attracted, The generation of an electrode pattern during transfer is prevented. When the paper 40 is fed by the feed roller 36 in this state, the paper is successively sucked onto the transfer drum 32 from the leading end at the contact portion between the conductive roll 46 and the transfer drum 32. At this time, the conductive roll 46
Is grounded, and the conductive roll 46 is
The positive voltage of the first power supply 72 for suction is supplied to the electrode 56 corresponding to the position in contact with the first power supply 72 by the first suction brush 68. Therefore, the potential of the electrode 56 and the potential of the conductive roll 46 are different. Are different from each other, electric charges sufficient to contribute to suction are injected into the sheet from the conductive roll 46, and the suction force at the sheet suction position increases. The sheet adsorbed on the transfer drum 32 is sent to a transfer position as the transfer drum 32 rotates, where the first color toner image is transferred.
The sheet on which the first color toner image is transferred is further rotated two or three times while being adsorbed on the transfer drum 32 as it is, and the toner images of the second color and thereafter are transferred. When transferring the toner images of the second and subsequent colors, the second transport unit 34c is also connected to the first transport unit 34b.
The paper is in the suction state as in
46 is separated from the transfer drum 32 by a solenoid 48 so as not to disturb the unfixed toner image.
When the transfer of all the toner images is completed, the switch 76 is switched to the ground side at a timing earlier than the leading end of the sheet reaches the peeling position by a predetermined time, and the attraction force in the second transport unit 34c is gradually removed. The paper is peeled off from the transfer drum 32 by the peeling claw 42 and sent to the next process such as a fixing device by the transport belt 44. Here, at the above timing, the second
The grounding of the transport section 34c prevents the explosion (toner scattering phenomenon) that occurs when the paper is forcibly peeled off by the peeling claw 42 before the charge elimination of the resin film is completed with an appropriate time constant. This is to prevent it.

Conventionally, paper may not be adsorbed well especially under low temperature and low humidity, but according to this embodiment, the temperature / relative humidity is 28 ° C / 85%, 22 ° C / 55%, and 10 ° C / 30%, respectively. Good results were obtained for paper and OHP sheets of various thicknesses under environmental conditions.

In the present embodiment, the high voltage and the low voltage supplied to the electrode moved to the paper transport position are the positive potential and the ground potential, respectively. Although a combination of ground potentials is employed, any combination may be used as long as a potential difference is generated. Other combinations of the electrode potential and the potential of the conductive roll 46 include a positive potential and a different positive potential, a positive potential and a negative potential, a ground potential and a negative potential, and a negative potential and a different negative potential.

FIG. 6 is a view showing a second embodiment of the first means. Bearing member 80 of conductive roll 46 in contact with transfer drum 32
An urging member 84 is interposed between the transfer roller 32 and the frame 82 by the urging force of the urging member 84.
Is pressed. According to this configuration,
When the material of the conductive roll 46 is a rigid body such as a metal such as aluminum, a uniform contact force can be obtained in the longitudinal direction of the roll without requiring high-precision axis alignment, and the paper is attracted in the same longitudinal direction. There is no danger of the force dropping partially. Further, since the contact force is made uniform in the longitudinal direction, a relatively small contact force is required, so that deformation and distortion of the resin film hardly occur, and a good transferred image can be obtained for a long period of time.

FIG. 7 is a side view of a conductive roll showing a third embodiment of the first means. This conductive roll grounds a shaft 86 made of a conductor and a main body roll 88, and is fixed around the main body roll 88. The conductive rubber 90 is provided with a thickness.
By forming at least the surface layer portion of the conductive roll from an elastic body in this way, in addition to the effect when the urging member shown in FIG. 6 is used, the paper is formed along the curvature of the outer periphery of the resin film 32. An effect of mechanically deforming and increasing the attraction force is produced.

FIG. 8 is a side view of a conductive roll showing a fourth embodiment of the first means. This conductive roll connects a shaft 86 made of a conductor and a main body roll 88 to ground, and a conductive roll is provided around the outer periphery of the main body roll 88. The conductive brush 90 is formed by conductive bonding. In this embodiment, the force for mechanically moving the paper along the transfer drum is small, sufficient charge can be injected without bringing the conductive roll into close contact with the paper, and a stable suction force can be obtained. Then, wrinkles are hardly generated on the sheet.

FIG. 9 is a diagram showing a modification of the embodiment shown in FIG. As shown in FIG. 9A, by spirally winding the conductive brush 90 'on the main body roll 88, the portion having a high adhesive force moves in one direction. A new effect is obtained in that an air layer can be partially prevented from intervening to obtain uniform adhesion. Also, as shown in FIG. 7B, a conductive brush 90 ″ is spirally wound around the main body roll 88 in a reverse direction at a substantially central portion thereof. By applying a tensile force to the sheet, it is possible to more effectively prevent wrinkles and eliminate air layers, and to improve the straightness of paper.

In the embodiment shown in FIGS. 8 and 9,
The conductive roll may not be driven to rotate by the transfer drum 32, but may be positively driven to rotate.

FIG. 10 is a view showing another example of the electrostatic transfer device for explaining the fifth embodiment of the first means and the embodiments of the second means and the third means. This apparatus is provided with a resin film 94 formed in an endless belt shape, a pair of rollers 96 and 98 for mounting the resin film 94, and a horizontal surface of the resin film 94, each of which is provided with a cyan, magenta and yellow toner. A photoconductor 100 for cyan, a photoconductor 102 for magenta, a photoconductor 104 for yellow, and a photoconductor for yellow.
Elastic rollers 106, 108, and 110 that rotate while sandwiching the resin film 94 together with 100, 102, and 104, and are provided inside the resin film 94 at a transfer position where each photoconductor contacts the resin film 94 and at a sheet transport position excluding a transfer position of the resin film flat portion. And a power supply device 112 for supplying a predetermined voltage to the supplied electrodes. Note that the electrical connection of the brush of the power supply device 112 can be performed according to FIG. 5, and the description thereof is omitted.

In this configuration, when the paper 40 is fed from the paper feed cassette 38 by the feed roller 36, the leading edge of the paper is detected by a paper feed sensor (not shown), and the timing of image writing to each of the photoconductors 100, 102, and 104 is determined by this detection. You. At the same time, a predetermined electric field is applied to the sheet transport position and the transfer position by the power supply device 112. The paper adsorbed on the resin film 94 is transferred with a cyan image, a magenta image, and a yellow image, respectively, when passing immediately below the photoconductors 100, 102, 104,
As a result, a multiple transfer image for the same image is formed.
Image writing on the photoconductors 100, 102, and 104 is sequentially performed with a delay corresponding to the paper transport time, and is controlled so that each of the three colors overlaps. The sheet on which the multiple transfer has been completed is further sent to a fixing device, where fixing is performed.

FIG. 11 is a view showing a fifth embodiment of the first means. Here, the conductive roll 46 is rotatably brought into contact with the resin film 94 at the sheet suction position, and the conductive roll 46 is grounded via the conductive shaft 50. Then, in the power supply device 112, the suction brush 112a of the suction brush 112a connected to the positive potential portion and the suction brush 112b of the suction brush 112b connected to the ground portion.
The conductive rolls 46 are opposed to each other. According to this configuration, as in the embodiment shown in FIG. 1, electric charges are injected into the sheet via the conductive roll 46, and the sheet attraction force increases.

FIG. 12 is a view showing an embodiment of the second means. Here, among the rollers on which the resin film 94 is mounted, the roller 96 corresponding to the sheet suction position is formed of a conductor, and the power supply device 112
The roller 96 is grounded via the contact 116 in consideration of the fact that the suction brush 112a on the paper inlet side of the above has a positive potential. According to this configuration, an electric field is also generated between the suction brush 112a positioned at the end and the roller 96, so that the resin film is compared with a case where the roller 96 is not used as a power supply unit.
Paper suction power can be obtained over a wide range of 94 points. In this case, by forming the paper chute 114 from a conductor and setting it at a different potential from the roller 96, an electric field is also formed between the paper chute 114 and the roller 96, and the suction force is further increased. Can be. In this embodiment, the entire roller 96 is formed of a conductor. However, since the roller 96 is almost entirely in contact with an electrode (not shown) formed inside the resin film 94, for example, the roller 96 Only the surface layer at the end may be used as a conductor. It should be noted that by adopting a configuration in which the conductive roll 46 shown in FIG. 11 is combined with the configuration of this embodiment, it is possible to further improve the adsorptivity of paper.

FIG. 13 is a diagram showing an embodiment of the third means. Here, an auxiliary roller 118 made of, for example, an elastic body is rotatably brought into contact with the resin film 94 wound around the roller 96 corresponding to the sheet suction position. According to this configuration, the fed paper can be pressed against the resin film 94 to increase the adhesion. In this case, by setting the hardness of the surface layer portion of the auxiliary roll 118 to be smaller than the hardness of the resin film 94, the fed sheet is deformed along the curvature of the roller 96.
Further, the adhesion can be increased. Auxiliary roller 118
Is most preferably in contact with the entire surface of the resin film 94 in the width direction. However, by providing auxiliary rollers only at two positions corresponding to both end portions of the paper, it is possible to satisfactorily suction the end of the paper which is most difficult to attract. Can be. A spiral groove may be formed on the surface of the auxiliary roller 118 in the same manner as in the embodiment shown in FIG.

Effect of the Invention As described in detail above, according to the electrostatic transfer device of the present invention, there is an effect that a sheet can be satisfactorily adsorbed on a resin film at a sheet adsorbing position.

[Brief description of the drawings]

FIG. 1 is a side view of an electrostatic transfer device showing a first embodiment of the first means, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a sectional view showing a specific configuration example of the electrode, FIG. 5 is a power supply connection diagram of the brush power supply device, and FIG. 6 is a holding means of a conductive roller showing a second embodiment of the first means. FIG. 7 is a side view of a conductive roller showing a third embodiment of the first means. FIG. 8 is a side view of a conductive roller showing a fourth embodiment of the first means. FIG. 9 is a view showing a modification of the embodiment shown in FIG. 8, and FIG. 10 is a view explaining a fifth embodiment of the first means, an embodiment of the second means, and an embodiment of the third means. FIG. 11 is a side view of a main part of the apparatus showing a fifth embodiment of the first means, and FIG. 12 is an embodiment of the second means. apparatus Side view of a main portion, FIG. 13 is a side view of the device main part showing an embodiment of the third means, FIG. 14 through FIG. 18 is a diagram for explaining a conventional technology. 30 photoconductor, 32 transfer drum, 46 conductive roller, 58,94 resin film, 118 auxiliary roller.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsuo Okuno 2274 Hongo, Ebina-shi, Kanagawa Fuji Xerox Co., Ltd. In-house (56) References JP-A-61-232478 (JP, A) JP-A-50-90338 (JP, A) JP-A-60-128359 (JP, U) (58) Fields investigated (Int. ⁶ , DB name) G03G 15/16 G03G 15/01 114

Claims (6)

(57) [Claims] 1. A semiconductive resin film which moves a paper to which a toner image of a photoconductor is transferred at least at a transfer position while being in close contact with an outer surface, and a plurality of resin films arranged inside the resin film at regular intervals. And a transfer power supply unit that contacts the electrode that has moved to the transfer position among the electrodes and supplies a voltage having a polarity opposite to the polarity of the toner, and each of the electrodes that have moved to the paper transport position among the electrodes. A sheet feeding power supply unit for alternately supplying a high voltage and a low voltage with the movement of the resin film, wherein the paper suction power feeding unit is provided so as to be able to contact the electrode. A second power supply electrode group provided so as to be able to contact an electrode other than the electrode with which the first power supply electrode group is in contact, and means for giving a potential difference between the first and second power supply electrode groups. Conductive transfer device The roller is rotatably brought into contact with the resin film from the paper suction side at the paper suction position, and the potential of the conductive roll is different from the potential of the electrode corresponding to the contact position between the conductive roll and the resin film. An electrostatic transfer device, characterized in that: 2. The electrostatic transfer device according to claim 1, wherein the conductive roll is urged toward the resin film by an urging member. 3. The electrostatic transfer device according to claim 1, wherein at least a surface portion of the conductive roll is formed of an elastic material. 4. The electrostatic transfer device according to claim 1, wherein the conductive roll has a conductive brush on a surface thereof. 5. A semiconductive resin film formed in an endless belt shape and moving at least at a transfer position while adhering a sheet on which a toner image of a photoconductor is transferred to an outer surface, and a resin film formed inside the resin film. A plurality of electrodes arranged side by side at regular intervals,
At least two rollers on which the resin film is mounted, transfer power supply means for contacting the electrode moved to the transfer position among the electrodes, and supplying a voltage having a polarity opposite to the polarity of the toner;
A paper suction power supply unit that alternately supplies a high voltage and a low voltage to each of the electrodes that have moved to the paper conveyance position with the movement of the resin film among the electrodes, wherein the paper suction power supply unit includes: A first power supply electrode group provided so as to be able to contact the electrode, a second power supply electrode group provided so as to be able to contact an electrode other than the electrode with which the first power supply electrode group is in contact, And a means for applying a potential difference between the second power supply electrode group, wherein all or a part of a portion of the roller, which is in contact with the electrode, of a roller corresponding to a sheet suction position is made of a conductive material. An electrostatic transporting and transferring apparatus, wherein the potential of the conductor is different from the potential of the electrode contacted by the paper suction power supply unit at a position closest to the conductor. 6. A semiconductor resin film formed in an endless belt shape and moving at least at a transfer position while adhering a sheet onto which a toner image of a photoconductor is transferred to an outer surface, and a fixed resin film inside the resin film. A plurality of electrodes arranged in parallel at intervals,
At least two rollers on which the resin film is mounted, transfer power supply means for contacting the electrode moved to the transfer position among the electrodes, and supplying a voltage having a polarity opposite to the polarity of the toner;
A paper suction power supply unit that alternately supplies a high voltage and a low voltage to each of the electrodes that have moved to the paper conveyance position with the movement of the resin film among the electrodes, wherein the paper suction power supply unit includes: A first power supply electrode group provided so as to be able to contact the electrode, a second power supply electrode group provided so as to be able to contact an electrode other than the electrode with which the first power supply electrode group is in contact, A means for applying a potential difference between the second power supply electrode group, wherein an auxiliary roller is freely rotatable around the resin film wound around a roller corresponding to a sheet suction position among the rollers. An electrostatic transfer device characterized by being brought into contact.