JP2855647B2 - 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).
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. 12 is a view showing an example of a conventional electrostatic transfer device. As shown in FIG. 13, a semiconductive resin film 4 in which a plurality of electrodes 2 are arranged on a single surface at regular intervals is supported on a rigid drum (not shown) to form a transfer drum 6, and this transfer drum 6 is placed at a transfer position. A transfer brush power supply device for supplying a voltage having a polarity opposite to the polarity of the toner by sliding against the photosensitive member 8 having the same diameter as this and sliding on one of the electrodes 2 which has moved to the transfer position.
10, a paper suction brush power supply device 12 for alternately supplying a high voltage (for example, a positive potential) and a low voltage (for example, a ground potential) by sliding on one of the electrodes 2 that has moved to the paper transport position. It is provided and configured. Since the latent image formation and development are performed for each color component each time the photosensitive member 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 feeding brush power supply device 12 or the like.

FIG. 14 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, is mounted on at least two rollers 14 and 15, 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. A transfer brush power supply device 10 and a paper suction brush power supply device 12 are provided so as to abut on the flat portion and correspond 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, and the curvature of the roller 15 on the exit side. By B
It is discharged in the direction.

FIG. 15 is a diagram showing a specific configuration example near the transfer position. The transfer brush 16 is slid on the electrode 2 moved to the transfer position, and the potential of the transfer brush 16 is increased by the transfer power supply 18 when the polarity of the toner on the photoconductor 8 is, for example, negative. A transfer auxiliary brush 17 that is set to a potential and is grounded is provided before and after the transfer brush 16. Since an electric field is formed between the electrode group with which the transfer brush 16 is in contact and the photoconductor 8, the toner on the photoconductor 8 is transferred to the paper P at the transfer position along the electric field.

FIG. 16 is a diagram showing a specific configuration example near the paper transport position. A plurality of suction brushes 20 that slide on the electrodes 2 are provided in the moving direction of the resin film 4, and these are alternately provided with a suction power source 22.
Is connected to the plus and minus sides of
The paper P is attracted to the resin film 4 and transported by the electric field formed between the electrode groups on which the brushes slide.

Problems to be Solved by the Invention When the electrostatic transfer device having the configuration as shown in FIG. 12 or FIG. 14 is used, the following problems occur.

That is, with the above-described conventional configuration, when the paper is separated from the resin film after the multicolor transfer of full-color copying or the transfer of single-color copying, even if the power supply to the paper suction brush power supply device is stopped, the suction force is not changed. However, there is a problem that the paper does not immediately decrease and the paper is not peeled off satisfactorily. The use of a peeling claw to forcibly peel the paper may be suggested, but if the paper is forcibly peeled off by the peeling claw before the suction force is reduced, a peeling discharge occurs and the toner on the paper is scattered. (Explosion) occurs and the transferred toner image is disturbed.

The present invention has been created in view of such circumstances,
It is an object of the present invention to provide an electrostatic transfer device capable of quickly peeling a sheet after transfer without causing image disturbance.

Means for Solving the Problems The technical problem described above is particularly encountered in a drum-type electrostatic transfer device as shown in FIG.
It is solved by taking the means of.

That is, a semiconductive resin film that moves while adhering the paper on which the toner image of the photoreceptor is transferred to the outer surface at least at the transfer position, and 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 above-mentioned electrodes and supplies a voltage having a polarity opposite to the polarity of the toner; And a paper suction power supply unit for supplying a high voltage and a low voltage to the paper transfer device. The supply of the high voltage and the low voltage to the electrode in the corresponding portion can be switched to the supply of either voltage.

Particularly, in the case of a tandam-type electrostatic transfer device as shown in FIG. 14, the above technical problem can be solved by taking the following second means.

That is, a semiconductive resin film that moves while adhering the paper on which the toner image of the photoreceptor is transferred to the outer surface at least at the transfer position, and 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 above-mentioned electrodes and supplies a voltage having a polarity opposite to the polarity of the toner; Transfer device for supplying a high voltage and a low voltage to a sheet, a resin film of a photoreceptor for transferring a final transfer image among electrodes moved to a sheet conveyance position in the electrostatic transfer device There is provided a peeling power supply unit that contacts one of the electrodes on the downstream side in the moving direction and supplies one of the high voltage and the low voltage.

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. Therefore, specific combinations of high voltage and low voltage are + 2000V and + 500V, + 1500V and 0V, +1000
V and -500V, 0V and -1500V, -500V and -2000V, and the like.

According to another aspect of the present invention, there is provided an apparatus to which the above-described first and second means can be applied, wherein a semiconductive material that moves while closely adhering a sheet onto which a toner image of a photoconductor is transferred to an outer surface at least at a transfer position. A conductive resin film, a plurality of electrodes arranged at regular intervals inside the resin film, and contacting the electrode moved to the transfer position among the above-mentioned electrodes to supply a voltage having a polarity opposite to that of the toner. A transfer power supply unit; and 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 transport position among the electrodes as the resin film moves. Power supply means for adsorption,
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 giving a potential difference between the first and second power supply electrode groups. An electrotransfer transfer device is provided.

In this electrostatic transfer device, the high voltage and the low voltage are alternately supplied to the electrodes moved to the paper transport position by the paper suction power supply means. An electric field formed between the supplied electrode group and the electrode group supplied with the low voltage causes the electric field to be absorbed on the resin film and conveyed as the resin film moves. At this time, looking at the potential of each electrode, application of a high voltage and application of a low voltage are alternately repeated according to the movement of the resin film, so that the electrodes do not always have the same potential, and the injected charges are transferred. The occurrence of an electrode pattern (a phenomenon in which high-density portions and low-density portions alternate in a transferred image due to electrode pitch) due to being carried over to the position is suppressed, and image disturbance is less likely to occur.

According to the first aspect of the present invention, before the leading end of the sheet onto which the final transfer image has been transferred reaches the peeling position, at least the paper suction position of the paper suction power feeding means is located upstream of the paper peeling position in the resin film moving direction. By switching the supply of the high voltage and the low voltage to the electrode in the portion corresponding to the above to either one of the supply of the voltage, the attraction force can be promptly reduced without disturbing the transferred image. That is, the injection of charge into the paper and the charge elimination through the semiconductive resin film are not performed instantaneously, but are performed with a time constant (for example, 0.1 to 1.0 second) corresponding to the volume resistivity of the resin film. The supply of the high voltage and the low voltage to the electrode in at least a portion of the paper suction power supply unit corresponding to at least the upstream side of the paper peeling direction in the resin film moving direction can be switched to supply of either one of the voltages. For example, by performing the switching earlier at a timing corresponding to the time constant of the resin film, the sheet attracting force at the peeling position can be sufficiently reduced. By setting one of the high voltage and the low voltage, which is switched when the sheet is peeled, to the ground potential, the sheet leaving the electrostatic transfer device does not become charged, so that the potential difference between the devices is not changed. It is not necessary to keep the paper chute or the like in a floating state in order to eliminate the inconvenience caused by the above.

On the other hand, according to the second aspect of the present invention, among the electrodes moved to the paper transport position, the electrodes corresponding to the downstream side in the resin film moving direction of the photosensitive member for transferring the final transfer image are brought into contact, and the high voltage and the low voltage Since the peeling power supply means for supplying one of the transfer means is provided, the attraction force of the sheet after the transfer can be rapidly reduced in the same manner as in the first means.

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

FIG. 1 is a partially broken side view of an electrostatic transfer device showing an embodiment of the first means of the present invention, FIG. 2 is an enlarged view of a broken portion in FIG. 1, and FIG. 3 is III in FIG. FIG. 4 is a partial perspective view of the transfer drum shown in FIG. 1 along a line III-III.

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).

As shown in FIG. 4, the transfer drum 32 is provided with a rigid drum 52 made of metal or the like, an insulating support 54 provided on the outer periphery of the rigid drum 52, and a plurality of transfer drums provided at regular intervals on the support 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 fifth
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 that a high density portion or a low density portion occurs in a transferred image due to the electrode pitch) is likely to occur. 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. And transfer efficiency can be stabilized. In FIG. 4, the reason for exposing the vicinity of the end of the electrode 56 is to supply power to one side of the transfer drum 32 by a brush power supply device described below.

As shown in FIG. 3, the brush power supply device 34 is provided so as to cover the exposed portion of the electrode of the transfer drum 32. Inside the brush power supply device 34, a brush for power supply for performing various functions is provided in the circumferential direction. They are arranged alternately in rows. The brush power supply device 34
The function differs depending on the position in the circumferential direction. As shown in FIG. 1, a transfer unit 341 corresponding to the transfer position, a second transport unit 343 corresponding to the vicinity of the sheet peeling position, a transfer unit 341 and a second The first transport unit 342 corresponds to a portion other than the transport unit 343. The arrangement of the brushes in the transfer unit 341, the first transport unit 342, and the second transport unit 343 is the same.
The configuration of the transport unit 342 will be described with reference to FIG.
FIG. 3 shows a cross section corresponding to one row of the brushes arranged in two rows. Inside the housing 46,
A plurality of depressions 46a are formed at regular intervals in the circumferential direction, and a first suction brush 68 made of a base 68a and conductive fibers 68b is accommodated in the depression 46a. The first suction brush 68 can be connected to an external circuit via a metal plate 48 and a connection terminal 50 provided below the base 68a. Height a ₁ to the first adsorption brush 68 protrudes from the inner surface of the housing 46 is for example a 1.5 to 2.0 mm, the length a ₂ of the brush bites into the electrode forming surface EL of the transfer drum is about 1mm, for example. Thus, in this embodiment, the housing 46
Each brush is housed in the recess 46a of the conductive fiber 6
8b is prevented from spreading or falling.

The power supply connection of each part of the brush power supply device will be described with reference to FIG. It should be noted that FIG.
4 corresponds to a developed plan view of a sheet peeling position (a portion A in FIG. 1) between the second transport section 343 and the second transport section 343. Transfer unit 34
In FIG. 1, reference numeral 60 denotes a transfer brush, which is connected to the positive side of a transfer electrode 64 via a switch 62;
Is grounded. According to this configuration, a voltage having a polarity opposite to that of the toner can 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, and by grounding the transfer auxiliary brush 66, the electric field in the transfer section can be stabilized, and good transfer quality can be obtained. it can. That is, transfer is generally performed by moving charged toner particles on the photoreceptor along electric lines of force that form a transfer electric field. Therefore, by providing an auxiliary brush for transfer, the transfer electric field is confined in a narrow space, It is possible to prevent the toner particles from being transferred before the toner particles move to the transfer position, and it becomes difficult to cause a defect such as a blurred transfer image. In the first transport unit 342, the first suction brush 6
8 is alternately connected to the switch 70 and the ground. 72
Is a first suction power supply provided between the switch 70 and the grounding portion. In the second transport unit 343, reference numeral 74 denotes a second suction brush, which is alternately connected to the changeover switch 76 and the grounding 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 roller 32, the electrode 5 corresponding to the first transport unit 342 is
6 is plus, floating, as shown in FIG.
Since the potential changes repeatedly as earth, floating, plus,..., An electric field is formed between the positive electrode portion and the electrode group connected to the earth portion, and the paper can be attracted.
Further, since the state where the electric charge is injected into the specific position of the sheet is not maintained up to the transfer position, the electrode pattern is hardly generated. The reason why the period during which the electrode is floating is provided in order to prevent the plus portion of the brush and the ground portion from being short-circuited via the same electrode. When the paper 40 is sent out by the feed roller 36 in this state, the paper is sequentially sucked onto the transfer drum 32 from the leading end thereof at the contact portion with the transfer drum 32. 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 has been transferred is transferred to the transfer drum 32 as it is.
The toner images of the second and subsequent colors are further transferred two to three times in a state where the toner image is attracted. When transferring the toner images of the second and subsequent colors, the second transport unit 343 is in the sheet suction state similarly to the first transport unit 342. When the transfer of all the toner images is completed, the switch 76 is switched to the ground at a timing earlier by a predetermined time than the leading end of the sheet reaches the peeling position, and the suction force in the second transport unit 343 is gradually removed, The paper is peeled from the transfer drum 32 by the peeling claw 42,
The sheet is sent to the next process such as a fixing device by the conveyance belt 44.

By the way, at the time of peeling off the sheet after the transfer, the second
Since the charge elimination of the resin film or the paper in the transport unit 343 is not performed instantaneously, but is performed with a time constant corresponding to the volume resistivity of the resin film, it takes some time until the paper suction force almost disappears. . If the sheet is forcibly peeled off by the peeling claw before the charge elimination of the resin film or the sheet is completed, a phenomenon (explosion) occurs in which a peeling discharge occurs and the toner transferred onto the sheet is scattered. In this embodiment, since the volume resistivity of the resin film is set to be smaller than 10 ¹² Ωcm, the time constant can be set to about 0.1 to 1.0 second, and the peripheral speed of the transfer drum is set to 150 mm / second. In this case, the sheet suction force at the peeling position can be eliminated with a sufficient margin. That is, if the description is given with reference to FIG. 6, the changeover switch 76 is switched at a timing such that the sheet suction force at the peeling position becomes substantially zero in accordance with the time constant of the resin film 58, and By grounding all of the corresponding electrodes early, the paper can be peeled off at the peeling position without the occurrence of explosion.

In the case where the length of the second suction portion 343 is significantly increased in order to set the timing at which the sheet suction force at the peeling position becomes substantially zero in relation to the time constant of the resin film, FIG. As shown in (5), the separating corotron 84 may be opposed to the transfer drum 34 near the upstream side of the separating position. According to this configuration, the electric charge of the sheet is neutralized before the sheet is separated, so that the sheet attracting force can be reduced more quickly than by natural discharge.

FIG. 9 is a side view of the electrostatic transfer device showing an embodiment of the second means. This apparatus includes a resin film 94 formed in an endless belt shape, and a pair of rollers 96 and 98 on which the resin film 94 is mounted.
And a photoconductor 100 for cyan, a photoconductor 102 for magenta, and a photoconductor 104 for yellow, which are disposed on the horizontal surface of the resin film 94, and are developed on the same original image by respective toners of cyan, magenta, and yellow. And each photoconductor 100, 102, 10
4, elastic rollers 106 and 1 that rotate while sandwiching the resin film 94
08, 110 and the resin film 94 at the transfer position and the paper transport position.
And a brush power supply device 112 for supplying a predetermined voltage to the electrode provided inside the device. The electrical connection of the brushes and the arrangement of the electrodes of the brush power supply device 112 can be performed in accordance with each of the above-described embodiments, and a description thereof will be omitted.

Paper 40 from feed cassette 38 by feed roller 36
Is fed, the leading edge of the paper is detected by a paper feed sensor (not shown), and the timing of writing an image to each of the photoconductors 100, 102, and 104 is determined by this detection. At the same time, a predetermined electric field is applied to the paper transport position and the transfer position by the brush 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 directly below the photoconductors 100, 102, and 104, and as a result, a multiple transfer image for the same image is formed. Photoconductor 100,10
Image writing to 2,104 is sequentially performed with a delay of 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. 10 is a view showing the vicinity of the sheet peeling position. In this embodiment, a brush 112A corresponding to the downstream side in the resin film circumferential direction of the yellow photoconductor 104 in the brush power supply device 112 is used.
Is always grounded. The grounded brush
The length of the resin film corresponding to 112a can be determined according to the time constant of the resin film so that the resin film is discharged before the paper is discharged. According to this configuration, the attraction force of the paper on which the final transfer image has been transferred to the resin film is promptly reduced, and the paper can be satisfactorily peeled.
In this case, the electrode near the peeling position is at the ground potential,
Since the paper conveyed to another device after being peeled off from the resin film is not charged, there is no need to float a paper chute (not shown) or apply a predetermined potential to the paper chute or the like.

The brush 112 near the peeling position in the brush power supply device 112
Even if a is not grounded, as shown in FIG. 11, at least the surface portion of the roller 98 corresponding to the paper peeling position is formed of a conductor, and the roller 98 is grounded via the contact 99. Can obtain substantially the same effects as in FIG.

Effects of the Invention As described in detail above, according to the present invention, it is possible to provide an electrostatic transfer device that can quickly peel off a sheet after transfer without causing image disturbance. Play.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of an electrostatic transfer device showing an embodiment of the first means of the present invention, FIG. 2 is an enlarged view of a broken portion in FIG. 1, and FIG. FIG. 4 is a partial perspective view of the transfer drum shown in FIG. 1, FIG. 5 is a cross-sectional view showing a specific configuration example of the electrode shown in FIG. 4, and FIG. FIG. 7 is a power supply connection diagram of the brush power supply device shown in FIG. 1, FIG. 7 is an explanatory diagram of a power supply unit of the device shown in FIG. 1, and FIG. 8 is a static electricity diagram showing another embodiment of the first means of the present invention. 9 is a side view of an electrostatic transfer device showing an embodiment of the second means of the present invention, FIG. 10 is a side view showing the vicinity of a sheet peeling position in FIG. 9, FIG. FIG. 11 is a side view showing a modification of FIG. 10 in the vicinity of a sheet peeling position, and FIGS. 12 to 16 are views for explaining a conventional technique. 30 photoconductor, 32 transfer drum, 34, 112 brush power supply device, 42 peeling claw, 56 electrode, 58 film resin film, 60 transfer brush, 68 first suction Brush, 74: Second suction brush, 84: Peeling corotron.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akihiko Noda 2274 Hongo, Ebina-shi, Kanagawa Prefecture Fuji Xerox Co., Ltd. Ebina Office (56) References JP-A-60-241075 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) G03G 15/16

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. The above-described paper suction The supply of the high voltage and the low voltage to the electrode in at least a portion corresponding to at least the upstream side in the resin film moving direction of the sheet peeling position in the first and second power supply electrode groups of the wearing power supply unit is performed by applying either one of the voltages. An electrostatic transfer device characterized in that it can be switched to supply. 2. The electrostatic transporting transfer device according to claim 1, wherein the switch to supply of one of the voltages by the paper suction power supply means causes the leading end of the paper on which the final transfer image has been transferred to reach the peeling position. An electrostatic transfer device, wherein the transfer is performed before the transfer. 3. The electrostatic transfer device according to claim 1, wherein one of the voltages switched by the paper suction power supply means is a ground potential. 4. A semiconductive resin film which moves while closely adhering a sheet on which a toner image of a photoreceptor is transferred to an outer surface at least at a transfer position, 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. Paper transfer position The peeling power supply for supplying one of the high voltage and the low voltage by contacting the electrode corresponding to the downstream side in the resin film moving direction of the photosensitive member that transfers the final transfer image among the electrodes moved to the position. An electrostatic transporting and transferring apparatus comprising means. 5. The electrostatic transfer device according to claim 4, wherein at least the surface layer of the roller on which the resin film is mounted is formed of a conductor, and the roller is used as a power supply for peeling. Electrostatic transfer device. 6. The electrostatic transfer device according to claim 4, wherein the voltage supplied by the peeling power supply means is a ground potential.