JPH0431070A - Inkjet image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to image forming apparatuses having image forming functions such as facsimile machines, copying machines, and printers, as well as output devices such as multifunction peripherals and workstations equipped with these functions. The present invention relates to an image forming apparatus used in an image forming apparatus.

[Prior Art] Image forming devices (devices with recording means) such as printers, copiers, and facsimiles form images consisting of dot patterns on recording materials such as paper and thin plastic plates based on image information. It is structured in such a way that

The image forming apparatus can be divided into inkjet type, wire dot type, thermal type, laser beam type, etc. according to the recording method.
It is configured to form an image by ejecting ink onto a recording material.

In the above-mentioned image forming apparatus, it is necessary to transport the recording material from a paper feeding section such as a cassette to a stray paper section through an image forming section (recording section).

In that case, the image is formed on the recording material after it is fed,
It is always controlled at a constant timing until the paper is ejected.

Particularly accurate conveyance is required from paper feeding timing to image formation because it affects the position at which the image is formed on the recording material.

Further, during image formation, if the conveyance speed of the recording material is not constant, a deviation in the magnification of the image will occur, resulting in expansion and contraction of the image.

In particular, multiple image forming units (recording heads) such as color
In the case of an image forming apparatus in which two image forming units are arranged side by side, a shift occurs between images recorded by each image forming unit.

In the case of a color image recording apparatus, this shift appears as a color shift, resulting in an image defect.

In order to prevent such problems, it is necessary to accurately transmit the conveying force of the conveying means to the recording material, which is controlled with precision.

Conventionally, various conveyance means have been proposed as conveyance systems that take these points into consideration.

For example, there is a method in which the recording material is sent out using a pair of rollers and the conveying direction is regulated using a guide.

In this method, the recording material is sent out by the pressure between the rollers, so the conveying force is strong, and it is a simple and reliable method.

However, it is necessary to arrange the roller pairs at an interval shorter than the minimum length of the recording material to be used, making it unsuitable for, for example, feeding postcard or business card-sized paper. In addition, from the time it is transferred using an electrophotographic drum to the time it is fixed,
Another problem is that it cannot be used when it is necessary to keep the recording surface in a non-contact state.

As a conveying device that solves these problems, a conveying device that uses an endless heald and brings the recording material into close contact with the endless heald by electrostatic adsorption is known.

[Technical problem to be solved by the invention] By the way, this belt-type conveyance device using electrostatic adsorption is particularly useful for color image formation using multiple image forming means (recording gutter, transfer drum, etc.) In the case of a device, etc., it is necessary to precisely maintain the conveyance speed of the belt in order to accurately position the image forming portion of each image forming means.

On the other hand, in the above-mentioned heald-type conveyance device using electrostatic adsorption, the rubbing member that rubs against the conveyance heald includes, for example, an electrostatic adsorption means (electrostatic adsorption auxiliary member), and a member for cleaning the heald surface. Plates and ink absorbers have been used.

These sliding members create a load when the belt is conveyed, increasing uneven rotation of the drive source, and causing slight slips between the drive roller and the belt, causing disturbances in conveyance speed. .

When this disturbance in the conveyance speed occurs, for example, an image recorded by the first recording head (image forming means) in the recording gutter section (ii!
When the image forming means (image forming means) tries to overlap images, the time taken for the image recorded by the first recording head to reach the second recording head changes, resulting in recording misalignment, and color In the case of images, this results in color misalignment.

In particular, if the conveyor belt is made of rubber-based material and the blade is also made of rubber-based material, the load torque increases significantly due to the friction between the two, which is a major cause of image shift.

The present invention has been made in view of the technical problems in image forming apparatuses having such belt-type conveyance means, and is capable of precisely maintaining the conveyance speed of the conveyor belt.
An object of the present invention is to provide an image forming apparatus that can form high-quality images by preventing image expansion/contraction and image shift.

[Means for Solving the Problems] The present invention provides a conveyance means for conveying a recording material, a recording means for forming an image on the recording material on the conveyance means, and at least one slider that rubs against the conveyance means. In an image forming apparatus having a rubbing member, when an image is formed by the recording means, at least one of the rubbing members is released from the conveying means, so that the conveying speed of the conveying belt can be precisely controlled. An object of the present invention is to provide an image forming apparatus that can form high-quality images by preventing image expansion/contraction and image shift.

The present invention is implemented in an image forming apparatus that uses an endless heald that is wound around at least two rollers as the conveyance means, and further uses a plurality of inkjet recording heads that eject ink as the recording means. This is particularly effective in some cases.

〔Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 3 is a vertical cross-sectional view showing an example of the configuration of an image forming apparatus to which the present invention is applied, and FIG. 4 is an enlarged partial vertical cross-sectional view showing the configuration of main parts in FIG.

In FIG. 3, 301 is a part of a scanner that reads a document and converts it into an electrical signal.

The converted signal is given to the recording head section 305 of the recording device section 302 as a drive signal.

Recording paper, which is one of the recording materials stored in the cassette 303, is sent out sheet by sheet to the W feeding section 304 when necessary.

An image is recorded on the recording material (recording paper, etc.) by the recording head section 305 when it passes through the heald conveyance section 304 , and is sent out to the tray 420 via the fixing and discharging section 307 .

In addition, 306 is a recovery cap part, and to the said record,
It has a function of keeping the code section 305 in a recordable state at all times.

Here, in the recording head unit 305, a plurality (for example, four) of line-type recording heads are arranged, each of which has multiple ejection ports in a line shape and is elongated to the extent that it covers the paper width of the recording material. High-speed full color recording is possible.

In the case of full color, these recording nodes IA, IB, IC, and ID can be recording nodes using cyan, magenta, yellow, and black inks, for example.

The recording nozzle 1 (indicating any one of the recording heads IA-ID or the entire recording head) is an ink jet recording head that ejects ink using thermal energy, and does not generate thermal energy. It is equipped with an electrical heat index sample of 1.

The inkjet recording heads IA to ID perform recording by ejecting ink from the ejection ports by the growth of bubbles due to film boiling caused by thermal energy applied by the electrothermal converter.

In the scanner part 301, 401 is a document;
02 is a document scanning unit that scans a document.

Original [into scanning unit 402; lot array lens 4]
03, a same-magnification color separation line sensor (color image sensor) 404 and an exposure means 405 are built-in.

At least the document scanning unit 402 scans the document 4 on the document table.
010 When moving and scanning in the direction of the arrow in order to read an image, the exposure lamp in the exposure means 405 in the document scanning unit 7) 402 is turned on, and the reflected light from the document 401 is guided by the rod array lens 403 to produce color information. The light is focused on a same-magnification color separation line sensor (hereinafter referred to as a reading sensor) 404, which is a reading sensor, and reads the color image information of the original 401 for each color, and converts it into an electrical digital signal.

This digital signal is sent to the recording device section 302.

Drive signals based on these signals are supplied to the recording heads IA to ID for each color, ink is ejected, and an image is formed.

In FIGS. 3 and 4, the heald transport section 304 is
It is equipped with a conveyance heald (endless heald) 201 that is wrapped around at least two rollers 202 and 203, and the surface of the conveyance belt 201 has a volume resistance of 1014.
An insulating layer with a resistance of Ω1 or more is formed, and its surface is covered with a charging roller 2.
04 gives a constant charge.

Further, around the conveyor belt 201, a suction means 206 is provided for adsorbing a sheet-like recording material to the conveyor heald.
A cleaning means 308 for cleaning the surface of the conveyor belt 201 is provided, and the suction means 206 and the cleaning means 308 constitute a sliding member that can press against and separate from the conveyor belt 201. ing.

In FIG. 4, the conveyance heald 201 has an insulating layer having a volume resistance of 10<14 >[Omega]1 or more on its surface as described above, and is stretched by a driving roller 202 and a driven roller 203.

The drive roller 202 is connected to a drive motor (not shown),
It is driven in the direction of arrow A.

Further, the charging roller 204 is connected to a high voltage electric aHV,
The conveyor belt 201 is moved by the wings 205 arranged on both sides.
is pressed against.

The driven roller 203 is electrically grounded, and the conveying roller 203 is connected between the driven roller 203 and the charging roller 204.
01 and applying a high voltage of 1 to 2 kV to the charging roller 204, a potential is applied to the surface of the transport heald 201.

The adsorption means (adsorption member) 206 is electrically grounded.

In this embodiment, this adsorption member 206 is
6B and a resin notebook 206S, the tips of these two parts are in contact with the surface of the conveyor belt 201.

A transport heald 2 is located at a position opposite to the recording section 305.
A platen 207 is provided to keep the recording surface 01 flat.
Pin 207 to keep the distance from A-I D constant
P is provided.

The cleaning means (held cleaning section) 308 includes a blade 281 and an ink absorber 283.
These blades 281 and ink absorbers 283 are
Each is supported by a support stand 282 and a support stand 284.

Next, the operation of the cleaning means 308 will be explained.

First, the transport heald 201 is run to bring the blade 281 into contact with the transport heald, and after a predetermined period of time, the EVB transport heald is stopped and the blade 281 is separated from the transport belt.

At this time, an ink mark remains on the conveyor belt 201 along the edge of the blade 281.

Therefore, the conveyor belt 201 is driven again, and when the ink trace reaches the position of the ink absorber 283, the conveyor belt 201 is stopped again, and the ink absorber 283 is brought into contact with the conveyor belt 201 to absorb the ink trace.

After a certain period of time has elapsed, the ink absorber 283 is separated from the transport heald 201, and the cleaning operation is completed.

After the recording material is sent out by the registration rollers 20, it passes between the suction member 206 and the conveyance heald 201.

At this time, the conveyance heald 201 is charged by the charging roller 204, and the recording material is polarized by the electric potential and is attracted to the recording material.

Further, an electric charge is injected into the recording material by the suction means (suction unit) 206, and the recording material is more firmly attracted to the conveyor belt 201.

Thereafter, an image is recorded on the recording material in a recording section (recording head section) 305, and then it is separated from the conveyance heald 201 on the drive roller 202 and discharged.

As described above, the image forming apparatus of the present invention includes a conveyance means 201 for conveying a recording material, a recording means 305 for recording an image on the recording material on the conveyance means, and at least one roller that rubs against the conveyance means. Two sliding members 204.206.28
1, the recording means 30
The image forming apparatus is configured such that at least one of the rubbing members 281 is released from the conveying means 201 when an image is recorded by the image forming apparatus 5.

In the embodiment described above, the conveying means 201 is composed of an endless belt that is wound around at least two rollers 201 and 203, and the recording means is a plurality of ink jets that eject ink.

The recording head is composed of recording heads IA, IB, and IC1ID.

Further, the sliding member includes a blade 281 as a cleaning member that cleans the surface of the transport heald 201, a charging port 204 that applies an electric charge to the transport heald 201,
and an electrostatic adsorption auxiliary member (such as a conductive brush) 206 for bringing the sheet-shaped recording material into close contact with the conveyance heald 201
It is composed of three members B, of which the blade 281
is configured to separate (release) from the surface of the conveyor belt 201 during recording.

In this case, the blade 2 as a heald cleaning member
Preferably, 81 is formed of a rubber blade.

In addition, as described above, the surface of the conveyor belt 2010 (the surface to which the recording material comes into close contact) is formed of an insulating layer capable of retaining electric charge, and electrostatically attracts the recording material supplied thereon. It has a convenient structure.

FIG. 1 is a flowchart showing an example of the cleaning operation of the image forming apparatus described above.

In FIG. 1, when the recording button is pressed to start the recording sequence, in step F1 the conveyor belt 20
1 begins to move.

Here, the conveyance heald 201 may start moving after the recording material reaches the recording material sensor S0 arranged immediately before the registration roller 20.

After that, in step F2, the heald cleaning plate F281 is transferred to the heald 201 by a drive source (not shown).
press against.

The recording material is sent out by the registration rollers 2o2, conveyed near the driven rollers 203, and electrostatically attracted to the rollers 201.

The recording material moves the suction member 206 to i! I met you, step F3
When the leading edge of the recording material is detected by the recording material sensor S1, the blade 281 moves to the conveyor heald 2 in step F4.
It is canceled (jil! interval) from 01.

In this case, considering the distance from sensor S1 to the most upstream recording head IA, from the detection of sensor S1 to blade 2.
It is also possible to provide a time lag until 81 is released.

While image formation is being performed on the recording material in this state, the sensor s0 and the sensor S
The recording material is being detected on at least one of the recording materials (step F5).

Immediately after recording is completed to the rear end of the recording material, the sensor S
Since neither sensor S1 nor sensor S2 has detected the recording material, if it is determined in step F5 that neither sensor S nor sensor S2 has detected the recording material, the plate 281 is conveyed again in step F6. Held 201! Press this.

Thereafter, in step F7, for example, as described above, the conveyance by the leeching means 308 is carried out by the 1-201
A cleaning operation is performed on the surface.

According to Nokens, as explained above in Figure 1, during recording, the recording head unit 305 (transfer health)
Since the blade 281, which exerts the largest load (frictional resistance) on the conveyor blade 201, is spaced apart, the conveyance precision of the conveyor blade 201 can be maintained precisely, and good recording without image shift can be achieved. Ta.

In the case of continuous recording, as shown by the broken line in FIG.
01, in step F8, it is determined whether or not recording has been performed on the set number of recording materials, and the operations of steps F3 to F6 are repeated until the set number of sheets is reached, and the set number of sheets is reached. Thereafter, a sequence is adopted in which the process proceeds to step F7 and the cleaning operation described above begins.

Even with such a continuous recording sequence, as in the case described above, it was possible to reduce the load on the conveyance heald 201 during recording, and by maintaining precise conveyance accuracy, it was possible to perform good recording without image shift. .

FIG. 2 is a flowchart showing another example of the cleaning operation of the image forming apparatus described above.

In this embodiment, together with the blade 281, the suction member 206 is also separated from the conveyor belt 201 in advance.

In FIG. 2, first, when the recording button is pressed and the recording sequence is started, the transport heald 2 is moved in step Fil.
01 starts moving.

Here, after the recording material reaches the recording material sensor S1 placed just before the registration roller 20,
201 may start moving.

Thereafter, in Step F]2, the belt cleaning blade 281 is moved to the conveyor heald 20 by a drive source (not shown).
1, and furthermore, in step F13, the adsorption member 206, which has been separated in advance, also presses against the recording material (transport heald 20
], ).

The recording material is sent out by the registration rollers 20,
It is electrostatically attracted to the conveyor belt 201 near the driven roller 203 .

When the recording material passes through the suction member 206 and its leading edge is detected by the recording material sensor S1 in step F14, the blade 281 is first released (separated) from the transport heald 201 in step F15.

Then, in step F16, it is determined whether or not a certain period of time preset in the timer has elapsed, and when the certain period of time has elapsed, the suction member 206 is separated from the recording material (step F17).

This certain period of time is the time from when the leading edge of the recording material is attracted to the conveyor belt 201, where the part of the recording material that is particularly prone to curling, until just before the leading edge of the recording material reaches the recording gutter 1A on the most upstream side. Yes, it can be set in advance using a timer.

While image formation is being performed on the recording material in this state, the sensor S and the sensor S2 are
Detection of the recording material is being performed on at least one of them (step F18).

Immediately after recording is completed to the rear end of the recording material, the sensor S
Since neither sensor S1 nor sensor S2 detects the recording material, if it is determined in step F18 that neither sensor S1 nor sensor S2 detects the recording material, the flade 281 is moved again to the conveyor belt in step F19. 201.

Thereafter, in step F20, the surface of the conveyor belt 201 is cleaned by the leaning means 308 as described above, for example.

According to the sequence described above with reference to FIG.
Since the suction means 206 is also spaced apart from the blade 281, which has the largest load (frictional resistance) on the transport belt 201, the load (frictional resistance) on the transport belt 201 can be further reduced, and the transport accuracy of the transport heald 201 can be further improved. It was possible to perform good recording without layer image shift.

In the case of continuous recording, as shown by the broken line in FIG. Determine whether or not recording has been performed, and repeat steps F13 to F until the set number of sheets is reached.
After the operation of step 19 is repeated and the set number of sheets is reached, the process proceeds to step F20 and a soaking sequence is adopted in which the above-mentioned cleaning operation is started.

In addition, in this embodiment, when the recording material is continuously conveyed, the distance between the front and rear recording materials is equal to the distance between the sensor S and the sensor S.
It needs to be larger than the distance between the two.

In the embodiments described above, the present invention is applied to the inkjet type recording unit 305 and the endless held type heald conveying means 3.
Although the case has been described in which the present invention is applied to an image forming apparatus using 04, the present invention is not limited thereto, and can be applied to other types of image forming apparatus, such as electrophotographic forming means and
The present invention can be similarly applied to an image forming apparatus using an Ill transport means.

The fifth issue is a longitudinal cross-sectional view showing a configuration example when the present invention is applied to an image forming apparatus using an electrophotographic forming means and a heald conveying means.

In FIG. 5, 201 is a conveyance heddle for conveying the recording material, 204 is a charging row that is pressed against the conveyance belt 201K, and 206 is a conveyance heald for conveying the recording material.
It is an electrostatic adsorption member for adhering to 201K, and 28
1 is a cleaning blade for cleaning the transport heald 201K, 305 is an electrostatic image forming unit as a recording means, and IAK, IBK, ICK, and IDK form images of different colors on the recording material. This is a transfer section (recording section) for recording, and each of S, S, and S is a recording material sensor.

In the embodiment shown in FIG. 5, as in the case of the above-mentioned embodiment, there are three sliding members that rub against the transport belt (transport means) 201K: the charging roller 204K, the suction member 206K, and the cleaning member 281. At least one of these rubbing members, for example, the cleaning member 281K, or the cleaning member 281 and the suction member 206, is released (separated) from the transport heald 201K during image formation. It is configured as follows.

Even with the image forming apparatus described above with reference to FIG.
As in the case of the above-mentioned embodiment, during image formation (recording) by the transfer units IAK to IDK, some of the sliding members such as the blade 281, which applies the largest load (frictional resistance) to the conveyor belt 201K, Since at least one of the two is spaced apart from each other, the precision of conveyance by the conveyor belt (201) can be maintained precisely, and a good image can be formed on the recording material without image shift.

In the above embodiments, the present invention is applied to a line-type recording head IA-L that covers the recording area in the paper width direction of the recording material.
Although the present invention has been described by way of example in which the image forming apparatus is applied to an image forming apparatus having a line-type recording device 302 that uses D, The present invention can also be applied to recording devices using other recording methods, such as a real scan type recording device, and similar effects can be achieved.

Further, the present invention can be similarly applied to an image forming apparatus equipped with a recording means having one or more recording heads or transfer sections (image forming sections), and similar effects can be obtained. .

The present invention brings about excellent effects particularly in an image forming apparatus using an inkjet recording apparatus of the Hubble Genoto method proposed by Canon Co., Ltd. among inkjet recording methods.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796.

This method is applicable to both the so-called on-demand type and continuous type, but especially in the case of the on-demand type, it is applicable to sorting, ffi, and channels where liquid (ink) is held. The electrothermal converter G that is arranged,
By applying at least one drive signal that corresponds to the recorded information and causes a temperature increase that exceeds nucleate boiling, the electrothermal transducer is forced to generate thermal energy, causing film boiling on the thermally active surface of the recording head. As a result, bubbles in the liquid (ink) can be formed in one-to-one correspondence with this drive signal, which is effective.

Due to the growth and contraction of these bubbles, liquid (
ink) to form at least one droplet.

If this drive signal is in the form of a pulse, bubble growth and contraction will occur immediately and appropriately, so liquids with particularly excellent responsiveness (
Ink) can be ejected, which is more preferable. As this pulse-shaped drive signal, those described in US Pat. No. 4,463,359 and US Pat. No. 4,345,262 are suitable.

Further, if the conditions described in US Pat. No. 4,313,124 concerning the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be achieved.

The configuration of the recording head includes, in addition to the combined configuration of ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, a heat acting section. US Pat. No. 4,558,333 and US Pat. No. 4,459,600 disclose a configuration in which the
The present invention also includes a configuration using the specification of the above specification.

In addition, for multiple electrothermal converters, common pickpockets,
Japanese Unexamined Patent Application Publication No. 123670 of 1982 discloses a configuration in which a hole is used as a discharge portion of an electrothermal converter, and Japanese Patent Laid-Open No. 1987 discloses a configuration in which an opening that absorbs pressure waves of thermal energy corresponds to a discharge portion. The present invention is also effective as a configuration based on Publication No. 138461.

Furthermore, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length can be increased by combining multiple recording heads as disclosed in the above-mentioned specification. Either a configuration that satisfies the above requirements or a configuration as one recording unit or two units formed integrally may be used, but the present invention can more effectively exhibit the above-mentioned effects.

In addition, a replaceable chip-type recording head that is attached to the device body enables electrical connection to the device body and ink supply from the device body, or a chip-type recording head that is installed integrally with the recording head itself. The present invention is also effective when a cartridge type recording head is used.

Further, it is preferable to add a recovery means for the recording head, a preliminary auxiliary means, etc., which are provided as a configuration of the recording device of the present invention, because the effects of the present invention can be further stabilized.

Specifically, these include capping means, cleaning means, pressure or suction means, preheating means for the recording head using an electrothermal transducer or another heating element, or a combination thereof. , and a preliminary ejection mode in which ejection is performed separately from printing are both effective for stable printing.

Furthermore, the recording mode of the recording device is not only for recording only royal colors such as primary colors, but also for recording.

The present invention is also extremely effective for devices equipped with at least one of multiple colors of different colors or full colors of mixed colors. It is.

In the embodiments of the present invention described above, the ink is explained as a liquid, but it is an ink that solidifies at room temperature or lower, and is softened or liquid at room temperature, or in the above-mentioned inkjet, the ink itself is heated at 30°C or higher. Since the temperature is generally controlled within a range of 70°C or less so that the viscosity of the ink is within the stable ejection range, it is sufficient if the ink is in a liquid state when the recording signal is applied. In order to prevent the ink from evaporating, the temperature rise caused by thermal energy can be actively used as energy to transform the ink from a solid state to a liquid state. In any case, application 2 according to the recording signal of thermal energy
Therefore, the present invention also applies to the use of ink that is liquefied only by heat treatment, such as ink that is liquefied and ejected as liquid ink, or ink that already begins to solidify when it reaches the recording material. is applicable.

In the second case, the ink is JP-A-54-56847.
As in the above publication, the porous notebook may have a shape that faces the electrothermal transducer while being held as a liquid or solid in the recesses or through holes of the porous notebook.

In the present invention, the most effective method for the above-mentioned ink is the one that implements the above-mentioned film boiling method.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, there is provided a conveyance means for conveying a recording material, a recording means for forming an image on the recording material on the conveyance means, and at least one member that rubs against the conveyance means. In the image forming apparatus having two sliding members, when an image is formed by the recording means, at least one of the sliding members is released from the transporting means, so that the transporting speed of the transporting heald can be controlled precisely. Provided is an image forming apparatus that can form high-quality images by preventing image expansion/contraction and image shift.

According to another aspect of the present invention, in addition to the above configuration, the conveying means may include an endless heald that is wound around at least two rollers, or the recording means may include a plurality of endless healds that eject ink. Since the configuration uses an inkjet recording head, an image forming apparatus that can further enhance the above effects is provided.

[Brief explanation of drawings]

FIG. 1 is a flowchart illustrating the operation of the conveyance heald cleaning means of the image forming apparatus according to the present invention, and FIG. 3 is a vertical sectional view showing an embodiment of the image forming apparatus according to the present invention, FIG. 4 is an enlarged partial vertical sectional view showing the main structure of FIG. 3, and FIG. It is a schematic dark blue cross-sectional circle showing another example. Below, symbols representing main components in the drawings are listed. 1, IA~LD---recording head, IAK~IDK
---Transfer section, 20--Registration roller, 201.
201 K-----1 conveyor belt, 202--1 driving roller, 203-----1 driven roller, 204.204
K---Charging roller, 206.206 K----Electrostatic adsorption member, 207---Platen, 281.2
81 K--Cleaning member (blade), 301
- Scanner part, 302---Recording device part, 3
03 Recording material storage cassette, 304-----Belt transport section, 305-1--Recording means (recording head section), 308 - Cleaning means, recording on Sl, S2S, S, material sensor, 401 original, 402 original scanning unit.

Claims (9)

[Claims] (1) In an image forming apparatus that includes a conveying means for conveying a recording material, a recording means for forming an image on the recording material on the conveying means, and at least one rubbing member that rubs against the conveying means. , when forming an image by the recording means,
An image forming apparatus characterized in that at least one of the sliding members is released from the conveying means. (2) The image forming apparatus according to claim 1, wherein the conveyance means is an endless belt wrapped around at least two rollers. (3) The image forming apparatus according to claim 1 or 2, wherein the recording means is a plurality of inkjet recording heads that discharge ink. (4) Claims 1 to 3, wherein the rubbing member is a cleaning member that cleans the surface of the conveying means.
The image forming apparatus according to any one of the above. (5) The image forming apparatus according to claim 4, wherein the cleaning member is a rubber blade. (6) The image forming apparatus according to claim 1, wherein the conveyance means has an insulating layer and electrostatically attracts the recording material. (7) The image forming apparatus according to claim 6, wherein the sliding member is an electrostatic adsorption auxiliary member. (8) The image forming apparatus according to claim 3, wherein the inkjet recording head includes an electrothermal transducer for generating thermal energy used to eject ink. (9) Image formation according to claim 8, wherein the inkjet recording head ejects the ink from the ejection port by the growth of bubbles due to film boiling caused by thermal energy applied by the electrothermal converter. Device.