JPH06175442A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To stably convey a recording sheet without occurrence of contamination at the printing surface of a cut sheet used as the recording sheet, by providing a means for limiting the position of conveyance of the recording medium. CONSTITUTION:A transfer electrode 22 and an attracting electrode 25 are secured to a swing arm 61. Further, a small diameter shaft 27 for limiting the position of conveyance of a recording sheet is attached thereto, downstream of the transfer electrode 22 so as to be positioned at the printing surface side of a recording sheet 28. The swing arm 61 can be swung through a pin 62. After complication of image transfer, the solenoid 53 is turned on just before the trailing end part of the recording sheet 28 comes off from the attracting electrode 25, and accordingly, the transfer electrode 22, the attracting electrode 25 and small diameter shaft 27 are separated from a developer carrier roll 4. The small diameter shaft 27 goes away from the roll 4 being accompanied with the trailing end of the recording sheet 28 remaining the transfer part so as to limit the position of conveyance of the sheet 28. With this arrangement, it is possible to prevent the sheet 28 from contamination due to contact with the developer carrier roll 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic recording apparatus used in a printer, a facsimile, etc., and particularly to a thin layer of a developer carried on the surface of a developer carrying member according to image information. The present invention relates to an electrostatic recording device that records an image by irradiating an ion stream to form an electrostatic latent image.

[0002]

2. Description of the Related Art Conventionally, as this type of electrostatic recording device,
For example, there is one as shown in Japanese Patent Laid-Open No. 61-209461. This is the developer 101, as shown in FIG.
A developer carrier 103 is rotatably disposed in an opening 102 provided on one side surface of a hopper 100 accommodating the hopper 100, and a thin layer of the developer 101 is formed on the surface of the developer carrier 103 by a layer forming member 104. Are uniformly formed, and the developer 101 is triboelectrically charged to a predetermined polarity.

Further, an ion current modulation means 105 is arranged at a position facing the developer carrying member 103 carrying a thin layer of the developer 101. This ion flow modulation means 105
Ion generator 1 disposed near the developer carrying member 103
06, a plurality of control electrodes 107, 107 ... Adjacent to the ion generator 106, and each control electrode 10
7, 107 ... And a control circuit 108 for applying a voltage according to image information.

The ion generator 106 is the discharge wire 1
09 and a shield 110 surrounding this, and a corona discharge is generated by applying a high voltage to the discharge wire 109. Then, the ions generated by this corona discharge pass through the upper opening 1 of the shield 110.
By the compressed air introduced from 11, the shield 110
From the ion flow control slit 112 opened at the bottom of the
Eject as a jet of ions.

At this time, the ion flow control slit 112 is provided.
Are arranged in large numbers with a predetermined number of pixel densities along a direction perpendicular to the drawing, and a voltage corresponding to image information is applied to these control electrodes 107, 107 ... by a control circuit 108. Apply. Then, the electric field selectively formed between the control electrodes 107, 107 ... And the shield 110 blocks or allows the passage of the ion current according to the image information, whereby the developer carrying member 10 is provided.
An electrostatic latent image corresponding to image information is formed on the thin layer of the developer 101 carried on the surface of No. 3 by an ion current having a polarity opposite to the charge polarity of the developer 101.

Then, in the thin layer of the developer 101 carried on the surface of the developer carrying member 103, the polarity is reversed only in the portion irradiated with the ion current according to the image information, and the developer whose polarity is reversed is reversed. The image 101 is transferred onto the recording sheet 117 passing below the developer carrying member 103 by the electric field formed by the transfer electrode 113, and then subjected to a fixing process to record an image.

In order to convey the cut paper used in the electrostatic recording apparatus, a roll pair 1 for conveying the paper is provided before and after the transfer portion between the developer carrying member 103 and the transfer electrode 113.
18, 118 are provided.

In this case, at the start and end of the conveyance of the recording sheet 117, the recording sheet 117 is held only on one of the sheet conveying roll pairs 118, 118, that is, the front end of the recording sheet 117 is transferred. The sheet 117 is in a cantilevered state in which the sheet 117 is supported only at one end side between the transport roll pairs 118 and 118 when the recording sheet 117 passes through the transfer portion and when the recording sheet 117 passes through the transfer portion.

Therefore, the position of the leading end or the trailing end of the recording paper 117 becomes unstable, and the leading end or the trailing end of the recording paper 117 contacts the surface of the developer carrying member 103,
The developer 101 carried on the surface of the developer carrying member 103 stains the printing surface of the recording paper 117 and the like, thus deteriorating the image quality.

Therefore, the present applicant has already proposed, as a solution to the above problems, the one disclosed in Japanese Patent Laid-Open No. 4-44059.

This electrostatic recording apparatus is constructed such that suction means for sucking a recording medium is provided near the transfer means.

That is, in the electrostatic recording apparatus, as shown in FIG. 6, suction electrodes 120 and 120 as suction means are integrally provided on both sides of the transfer electrode 113 via insulating substrates 119 and 119 made of synthetic resin or the like. It is configured to be provided in a specific manner. Then, a high voltage is applied to the adsorption electrodes 120, 120 by a high voltage power source 125 for adsorption, and the recording paper 1
17 by the potential difference from the transfer electrode 113
Since the toner is electrostatically adsorbed on the recording paper 117, the leading edge and the trailing edge of the recording paper 117 are also held at predetermined positions, and it is possible to prevent the developer carrying member 103 from coming into contact and becoming dirty.

However, in the case of the electrostatic recording apparatus according to the above proposal, the transfer electrode 113 and the suction electrode 122 have a three-pole structure, and the contact surface with the recording paper 117 is formed in the same flat surface or curved surface. Since it must be done, the processing is complicated and the productivity is poor, and the adhesion of the recording sheet 117 is greatly affected by the processing accuracy.

Therefore, in order to solve such a problem, the electrode structure is simple and the accuracy can be easily ensured, and at the same time, the recording sheet can be firmly adhered to both the suction and transfer electrodes. Electronic recording devices have also been devised.

In this electrostatic recording apparatus, the transfer electrode 113 has a round bar shape, and the attraction electrode 122 has the transfer electrode 113.
Is provided only on the upstream side of the transfer electrode 113.
Is formed in a flat plate shape. In addition, the transfer electrode 11
3 is held in the swing arm 123 by a fitting hole, and the electrode holding member 124 is fixed to the swing arm 12 by a bolt 125.
3, the adsorption electrode 122 is fixed to the electrode holding member 124 with a bolt 126. Furthermore, the transfer electrode 113
A tracking roll 127 is fitted to the end of the.

[0016]

However, the above-mentioned prior art has the following problems. That is, in the above electrostatic recording apparatus, the transfer electrode 113 has a round bar shape, and the attraction electrode 122 is provided only on the upstream side of the transfer electrode 113. The transfer electrode 113 is formed in a flat plate shape. Since it has a two-pole structure and the distance between the transfer electrode 113 and the adsorption electrode 122 becomes large,
When the trailing edge of the recording sheet 117 leaves the suction electrode 122, the holding force is lost, and the trailing edge of the recording sheet 117 is separated by the distance between the transfer electrode 113 and the attracting electrode 122 from the developer carrying member 103. The recording paper 117 comes into contact with the surface.
However, there is a problem in that the printed surface at the rear end portion is contaminated.

In this case, in order to avoid the above-mentioned stain on the trailing edge of the recording paper, even if a mechanism for moving the transfer electrode 113 and the suction electrode 122 away from the developer carrier 103 by a predetermined distance at the end of the transfer is used, Since the electrostatic attraction force is lost when the rear end portion of the 117 is separated from the attraction electrode 122, the recording sheet 117 cannot be reliably separated from the developer carrying member 103, and the above problems are solved. Can not do it.

[0018]

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art.
The purpose of this is that even when using an electrode with a simple and highly productive structure, it is possible to stably convey the printing surface of a cut sheet used as a recording sheet without causing stains. To provide an electronic recording device.

That is, according to the present invention, a developer carrier carrying a thin layer of a charged developer on its surface and a thin layer of the developer carried on the developer carrier are used as image information. Ion flow modulating means for irradiating the modulated ion flow and the developer carried on the developer carrying body are selectively placed on the recording medium which is opposed to the developer carrying body with a gap. In an electrostatic recording apparatus comprising: a transfer unit for transferring to a recording medium; an adsorption unit arranged in the vicinity of the transfer unit for adsorbing a recording medium; and a separation unit for separating the transfer unit from a developer carrier by a predetermined distance at the end of the transfer. A recording medium conveyance position regulating means for regulating the conveyance position of the recording medium so that the recording medium is separated from the developer carrying body together with the operation of the transfer means being separated from the developer carrying body is configured. .

As the recording medium transporting position regulating means,
For example, a shaft or a plate-shaped member fixed to the transfer unit holding member is used on the downstream side of the transfer unit, but the present invention is not limited to this, and the shaft or the plate is located on the side opposite to the transfer electrode (printing surface side). It may be independently driven.

Further, the recording medium conveying position regulating means is not limited to a means for mechanically regulating the conveying position of the recording medium so that the recording medium is separated from the developer carrying member, and the wind pressure by the blower is used. And so on.

[0022]

According to the present invention, the recording medium conveying position regulating means for regulating the conveying position of the recording medium is provided so that the recording medium is separated from the developer carrying body together with the operation of the transfer means being separated from the developer carrying body. The recording medium conveyance position regulating means regulates the conveyance position of the recording medium so that the recording medium is separated from the developer carrier from the position of the recording medium being transferred. When the end portion is separated from the suction means and the recording medium holding force by suction is lost, the conveyance position of the recording medium is regulated to prevent the recording medium from coming into contact with the developer carrier.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments.

FIG. 1 shows an embodiment of the electrostatic recording apparatus according to the present invention. In the figure, reference numeral 1 denotes a hopper containing a developer 2, and one side surface of the hopper 1 is provided with an opening 3 which is open to the side. A developer carrier roll 4 is rotatably arranged in the opening 3 of the hopper 1. The developer carrier roll 4 is configured by providing a conductive cylinder or a dielectric layer on the surface of the conductive cylinder. As the developer carrier roll 4, for example, a roll having a dielectric layer made of a thermosetting phenol resin or the like formed on the surface of a conductive cylinder made of an aluminum alloy or the like is used. A predetermined negative voltage is applied to the conductive cylinder of the developer carrier roll 4 by the ion extracting power source 5.
Further, inside the hopper 1, an auxiliary roll 6 for stirring the developer 2 and supplying new developer 2 to the surface of the developer carrier roll 4 is rotatably arranged.

In addition, a thin layer of the developer 2 is uniformly formed on the surface of the developer carrier roll 4 above the opening 3 of the hopper 1, and the developer 2 has a predetermined polarity (for example, a negative electrode). A layer forming member 7 that is triboelectrically charged is provided. As the layer forming member 7, for example, a metal plate 8 having a spring property, to which an elastic body 9 such as silicon rubber is attached, is used, and the elastic body 9 is brought into contact with the developer 2 to form the elastic body 9. The developer 2 is triboelectrically charged. The layer forming member 7 is attached so that the elastic body 9 comes into contact with the surface of the developer carrier roll 4 with a predetermined pressure contact force.

The developer 2 contained in the hopper 1 may be a one-component developer composed of only toner, or a toner, as long as it can be carried on the developer carrier roll 4. It may be a two-component developer composed of a carrier and a carrier. The developer 2 may be either magnetic or non-magnetic.

When the one-component developer 2 is used, as shown in FIG. 1, the developer 2 directly supplied onto the developer carrier roll 4 is brought into contact with the developer 2 and the developer 2 is triboelectrically charged. At the same time, a thin layer of the developer 2 is formed by the layer forming member 7 that forms a thin layer at the same time. When the two-component developer 2 is used, a known two-component developing device for an electrophotographic copying machine is used, and the developing roll of this developing device and the developer carrying member roll 4 are used.
A thin layer of the developer 2 is formed by, for example, a means for causing the developer 2 to be uniformly developed on the developer carrier roll 4 by applying a bias voltage between the two and the both.

Further, at a position facing the developer carrier roll 4 carrying a thin layer of the developer 2 as described above, an ion current modulated according to image information is applied to the thin layer of the developer 2. Ion flow modulation means 10 for irradiating is arranged.

The ion flow modulating means 10 is provided on one side surface of the ion flow control slit 12 provided adjacent to the ion generator 11 arranged near the developer carrier roll 4. A plurality of control electrodes 1 arranged
3 and 13, and a control circuit 14 for applying a voltage according to image information to each control electrode 13, 13.

The ion generator 11 includes a discharge wire 15
And a shield 16 surrounding the shield 16, the upper opening 17 of the shield 16 is formed as an air introduction slit for introducing compressed air from the compressor C, and the side opening 18 of the shield 16 is a generated ion. Is formed as an ion ejection slit for ejecting. A high voltage of positive polarity is applied to the discharge wire 15 by a high voltage power source 19 for ion source.

Further, on one side surface of the shield 16, an insulating substrate 21 made of glass or the like is spaced apart via an insulating spacer 20, and the side portion of the shield 16, the spacer 20, and the insulating property. A portion defined by the substrate 21 is formed as the ion flow control slit 12 toward the developer carrier roll 4.

Further, the control electrodes 13, 13 ...
Are formed on the insulating substrate 21 at a pitch corresponding to a predetermined resolution by means such as sticking or vapor deposition.
Is arranged on one side surface of the ion flow control slit 12 when it is assembled to the shield 16 side.

Further, a transfer electrode 22 is provided below the developer carrier roll 4 with a predetermined gap (for example, 100 to 500 μm). This transfer electrode 22
Is formed by a rod-shaped electrode and is integrally provided with an adsorption means described later. A high voltage power supply 23 for transfer, which is connected in series to the power supply 5 for extracting ions, is connected to the transfer electrode 22.

By the way, in this embodiment, a suction means for sucking the recording medium is provided near the transfer means.

As shown in FIGS. 1 and 2, the transfer electrode 22 is formed in a round bar shape, and a plate-shaped adsorption electrode 25 is provided on the upstream side of the transfer electrode 22.
The transfer electrode 22 protrudes slightly above the surface of the adsorption electrode 25, and has a round bar shape.
The recording paper 28 is surely brought into contact with the surface of the. The upstream side of the suction electrode 25 in the moving direction of the recording paper 28 is formed so as to be inclined downward so that the recording paper 28 can be smoothly transported. The transfer electrode 22 is fitted and fixed to the swing arms 61 and 61 for tracking through fitting holes.
On the other hand, the adsorption electrode 25 is a flat electrode support member 26.
The electrode support member 26 is fixed to the swing arms 61, 61. Further, a tracking roll 54 is fitted to the end of the transfer electrode 22.

Further, the swing arms 61, 61
Is extended to the downstream side in the moving direction of the recording paper 28,
On the downstream side of the transfer electrode 22, a small-diameter shaft 27 for restricting the recording paper conveyance position is attached so as to be positioned on the printing surface side of the recording paper 28.

The swing arms 61, 61 are
It is swingable via positioning pins 62, 62 at its tip. As a result, the transfer electrode 22, the suction electrode 25, and the small-diameter shaft 27 for controlling the position of the recording paper can be swung in the direction of coming in contact with and separating from the developer carrier roll 4.

As shown in FIG. 1, the electrode supporting member 26 is provided with an operating arm 40 projecting downward, and a rod 53a of a solenoid 53 is connected to the tip of the operating arm 40. In addition, the rod 53 of the solenoid 53
A spring 63 is loosely inserted in a, and the transfer electrode 22 and the like attached to the electrode support member 26 are urged upward by the spring 63. The distance between the developer carrying roll 4 and the transfer electrode 22 is maintained at a predetermined value by the tracking roll 54 fitted to the transfer electrode 22 coming into contact with the developer carrying roll 4. Has become. The distance between the developer carrier roll 4 and the transfer electrode 22 is, for example, the surface of the recording paper 28 held on the transfer electrode 22 and the developer carrier roll 4.
The gap with the surface of the toner layer formed above is set to be 40 μm.

The transfer electrode 22 and the attraction electrode 25 attached to the electrode supporting member 26 are rocked together with the swing arms 61, 61 to which the electrode supporting member 26 is attached by turning on the solenoid 53, thereby developing. It is designed to be separated from the agent carrier roll 4.

Further, a high voltage power supply 29 for adsorption, which is connected in parallel with the power supply 5 for extracting ions, is connected to the adsorption electrode 25. As the recording paper 28, so-called cut paper that is cut in advance to a predetermined size is used.

Further, as shown in FIG. 1, before and after the transfer portion between the developer carrying roll 4 and the transfer electrode 22, as shown in FIG.
A pair of paper feed rolls 30 and 31 for transporting the recording paper 28 are arranged at predetermined intervals. The pair of paper feed rolls 30 and 31 are rolls 30a and 3 having a small diameter.
1a and large-diameter rolls 30b and 31b are pressed against each other. Further, a paper chute 32 for guiding the recording paper 28 conveyed by the paper feed roll pair 30 is arranged in a substantially horizontal direction on the downstream side of the paper feed roll pair 30 on the supply side in the recording paper movement direction. In addition, at the tip of this paper chute 32,
A Mylar film 33 for pressing the recording paper 28 against the transfer device 50 is attached downward.

Further, behind the hopper 1, there is provided a fixing device 34 for fixing the image of the developer 2 transferred on the recording paper 28 by heat and pressure.

In FIG. 1, a paper detection sensor 4 for detecting the recording paper 28 is provided on the upstream side of the adsorption electrode 25.
5 are provided.

With the above-mentioned structure, the electrostatic recording apparatus according to this embodiment carries the recording sheet and records an image accordingly. That is, as shown in FIG. 1, the developer carrier roll 4 starts rotating in the arrow direction at a predetermined timing, and the surface of the developer carrier roll 4 is negatively charged by the layer forming member 7. A thin layer of developer 2 is uniformly formed.

The thin layer of the developer 2 formed on the surface of the developer carrier roll 4 moves with the rotation of the developer carrier roll 4, while the ion current modulation means 10 converts the image information into image information. The developer 2 is irradiated with the corresponding ion flow.
An electrostatic latent image image corresponding to image information is formed on the thin layer of.

That is, a high voltage is applied to the discharge wire 15 of the ion current modulation means 10 by the high voltage power source 19 to generate a corona discharge, and the ions generated by this corona discharge are introduced from the upper opening 17 of the shield 16. The compressed air of the compressor C is discharged as a jet flow of ions from the ion flow control slit 12 through the side opening 18 of the shield 16.

At this time, a large number of control electrodes 13, 13 ... Are arrayed at a predetermined number of pixel densities in the ion flow control slit 12, and the control circuit 14 controls these control electrodes 13, 13 ... A corresponding pulse voltage is applied. Therefore, the control electrodes 13, 13 ... And the shield 1
By the electric field selectively formed between the developer carrier 6 and 6, the passage of the ion current is blocked or allowed according to the image information, and the image is formed on the thin layer of the developer 2 carried on the surface of the developer carrier roll 4. An electrostatic latent image corresponding to information is formed by an ion current having a polarity opposite to the charge polarity of the developer 2.

The thin layer of the developer 2 carried on the surface of the developer carrying roll 4 has a positive polarity because the polarity is reversed only in the portion irradiated with the ion stream according to the image information. The developer 2 having the property of being negative is transferred onto the recording paper 28 passing under the developer carrier roll 4 by the electric field formed by the transfer electrode 22 to which the negative voltage is applied.

By the way, as the recording paper 28 onto which the image of the developer 2 is transferred, a so-called cut paper which is cut in advance to a predetermined size is used. The recording paper 28 made of this cut paper is accommodated in a paper feed cassette (not shown), and is supplied from the paper feed cassette in synchronization with the image recording operation. Then, as shown in FIG. 1, the recording paper 28 is conveyed in a state of being sandwiched by a pair of paper feed rolls 30, and the leading end portion thereof is guided by a paper chute 32 and pressed by a mylar film 33 to be attracted. It is conveyed while being in contact with the surface of the electrode 25.

Prior to that, when the recording paper 28 passes the position of the paper detection sensor 45 provided on the upstream side of the suction electrode 25, the leading end of the recording paper 28 is used for paper detection as shown in FIG. It is detected by the sensor 45.

Then, after the leading edge of the recording paper 28 is detected by the above-mentioned paper detection sensor 45, as shown in FIG.
A voltage of 0 KV is applied and a voltage of -1.0 KV is applied to the transfer electrode 25 for a predetermined time.

Until the leading edge of the recording paper 28 reaches the transfer position, the solenoid 53 is turned on as shown in FIG.
By setting the N state, the upward biasing of the spring 63 is blocked, so that the transfer electrode 22 is separated from the developer carrier roll 4.

The recording paper 28 is conveyed as described above, and the leading end portion of the recording paper 28 is located on the upstream side in the moving direction of the recording paper 28.
As shown in FIG. 3, when the electrostatic latent image formed on the developer carrier roll 4 is transferred to the transfer electrode 2 as shown in FIG.
It is set about 0.1 to 0.5 seconds before being located immediately above 2. Then, after a lapse of a short time, the solenoid 53 is turned off, the upward bias by the spring 63 is released, and the tracking roll 54 moves the developer carrying member roll 4
By abutting against, the gap between the transfer electrode 22 and the developer carrier roll 4 is set to a predetermined value. At that time, a voltage of -1.0 KV is applied to the developer carrier roll 4. Further, a voltage of −1.4 KV is applied to the adsorption electrode 25 by the high voltage power supply 29 for adsorption, and the transfer electrode 22 is grounded and maintained at 0 V after the solenoid 53 is turned off. Then, this transfer electrode 22
Due to the potential difference between the suction electrode 25 and
While being electrostatically adsorbed on the adsorption electrode 25, the developer image on the developer carrier roll 4 is transferred onto the recording paper 28 at a time point immediately above the transfer electrode 22.

At this time, the small-diameter shaft 27 for regulating the recording paper conveyance position is located above the conveyance position of the recording paper 28, and therefore does not participate in the conveyance of the recording paper 28 at all.

The trailing edge of the recording paper 28 is the paper detection sensor 4
After being detected by 0, as shown in FIG. 3, the voltage application to the developer carrier roll 4 is turned off, and the recording paper 2
Transfer is completed before the rear end of 8 leaves the adsorption electrode 25,
The transfer electrode 2 is turned on again by turning on the solenoid 53 immediately before the rear end of the recording paper 28 leaves the suction electrode 25.
2. The suction electrode 25 and the small-diameter shaft 27 for controlling the recording paper transportation position are brought into contact with and separated from the developer carrier roll 4.

Here, the time T from the application of the voltage to the developer carrier roll 4 being turned off to the application of the voltage to the adsorption electrode 25 being turned off is as shown in FIG. The time until the trailing edge of the image transferred to the recording paper 28 when the voltage application to the agent carrier roll 4 is turned off passes through the small diameter shaft 27 for controlling the recording paper conveyance position is set.

Then, the small-diameter shaft 27 for regulating the recording paper conveyance position is turned on by the solenoid 53 so that the trailing edge of the recording paper still remaining in the transfer portion is removed from the developer carrier roll 4. Keep away, recording paper 28
Even if the trailing end of the recording sheet 28 is separated from the suction electrode 25 and the recording sheet holding force due to suction is lost, the conveyance position of the recording sheet 28 can be regulated
The recording paper 28 does not come into contact with the developer carrier roll 4 and become dirty.

At this time, since the small-diameter shaft 27 for regulating the recording-paper conveying position contacts the printing surface, a transfer margin is provided at the rear end by the distance between the small-diameter shaft 27 for regulating the recording-paper conveying position and the suction electrode 25. There is a need.

As described above, the small-diameter shaft 27 for controlling the recording paper conveyance position moves the recording paper 28 along with the trailing edge of the recording paper 28 which is still in the transfer portion, so that the recording paper 28 is separated. The back end is the adsorption electrode 2
Even if the recording paper holding force due to suction is lost when the recording paper 28 is moved away from the position 5, the conveyance position of the recording paper 28 can be regulated, and the recording paper 28 can be reliably prevented from coming into contact with the developer carrier roll 4 and becoming dirty.

Second Embodiment FIG. 5 shows a second embodiment of the present invention. The same parts as those of the first embodiment will be designated by the same reference numerals and will be described. Paper transport position regulating member 27
Is a plate-shaped member which is not fixed to the swing arm but is held on the developer carrying member side.

That is, the recording sheet transport position regulating member 27.
Is slidably supported toward the recording paper 28,
It is biased downward by a spring 65, and one end thereof is connected to a drive solenoid 66.

The solenoid 66 is turned on until the transfer is completed.
In this state, the downward bias by the spring 65 is suppressed. When the transfer is completed, the solenoid 66 is turned on, and the transfer electrode 2
2 is retracted and solenoid 66 is turned on in synchronization with
By performing FF, the downward urging force of the spring 65 is released, and the recording paper conveyance position regulation member 27 is projected from the conveyance surface during transfer, so that the conveyance position of the recording paper 28 can be regulated.

As a result, the same effect as that of the above embodiment can be obtained.

Further, as compared with the first embodiment, since the recording sheet transport position regulating member 27 is driven separately from the retract of the transfer electrode 22, the retract timing of the transfer electrode 22 and the recording sheet transport position regulating member 27 are different. There is an advantage that the retract timing and the retract amount can be freely set.

The other structure and operation are the same as those of the above-mentioned embodiment, and the explanation thereof will be omitted.

[0066]

EFFECT OF THE INVENTION The present invention has the above-described structure and operation, and does not cause stains on the printing surface of a cut sheet used as a recording sheet even when an electrode having a simple and highly productive structure is used. It is possible to provide an electrostatic recording device that can be stably transported.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electrostatic recording apparatus according to the present invention.

2 (a) and 2 (b) are a plan view and a sectional configuration view showing a main part of the embodiment.

FIG. 3 is a timing chart showing the operation of the embodiment.

FIG. 4 is a cross-sectional configuration diagram showing a main part of the embodiment.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a cross-sectional configuration diagram showing a conventional electrostatic recording device.

7A and 7B are a plan view and a cross-sectional configuration diagram showing a main part of a conventional example.

[Explanation of symbols]

1 hopper, 2 developer, 4 developer carrier, 10
Ion flow modulation means, 22 transfer electrodes, 25 adsorption electrodes,
27 Small-diameter shaft for controlling recording paper transport position, 28
Recording sheet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuaki Watanabe 2274 Hongo, Ebina City, Kanagawa Prefecture Fuji Xerox Co., Ltd.

Claims (1)

[Claims] 1. A developer carrier carrying a thin layer of a charged developer on its surface, and a thin layer of the developer carried on this developer carrier are modulated according to image information. And a transfer for selectively transferring the developer carried on the developer carrying member onto a recording medium opposed to the developer carrying member with a gap therebetween. An electrostatic recording apparatus comprising: a means, a suction means arranged near the transfer means for sucking a recording medium, and a separating means for moving the transfer means away from the developer carrier by a predetermined distance at the end of the transfer. The electrostatic recording apparatus is provided with a recording medium conveyance position regulation means for regulating the conveyance position of the recording medium so that the recording medium is separated from the developer carrying body together with the operation of separating the recording medium from the developer carrying body. .