JPH11192768A - Image forming device and method - Google Patents

Image forming device and method

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Publication number
JPH11192768A
JPH11192768A JP9369125A JP36912597A JPH11192768A JP H11192768 A JPH11192768 A JP H11192768A JP 9369125 A JP9369125 A JP 9369125A JP 36912597 A JP36912597 A JP 36912597A JP H11192768 A JPH11192768 A JP H11192768A
Authority
JP
Japan
Prior art keywords
cleaning
image forming
dirt
unit
position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9369125A
Other languages
Japanese (ja)
Inventor
Yasuhiro Numata
靖宏 沼田
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP9369125A priority Critical patent/JPH11192768A/en
Publication of JPH11192768A publication Critical patent/JPH11192768A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Summary] [PROBLEMS] To enable cleaning to be completed promptly regardless of where contamination occurs on a sheet-like member conveying surface. SOLUTION: A cleaning roller 38 cleans dirt on the transport belt 31. Numeral 38a is a solenoid for bringing the cleaning roller 38 into contact with the conveyor belt 31 or releasing the contact. 100 is
This is a dirt detection sensor for checking dirt on the conveyor belt 31.
Based on the output of the dirt detection sensor 100, the position of the dirt portion is detected, and the dirt portion is moved to the cleaning roller 38 with the shortest distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus and an image forming method.

More specifically, the present invention relates to an image forming apparatus and an image forming method which can be applied to various apparatuses having a conveying means for conveying a sheet-like member, such as an ink jet printer, a facsimile machine, and a copying machine. is there.

[0003]

2. Description of the Related Art Conventionally, in various apparatuses such as an ink jet printer, a facsimile machine, and a copying machine having a conveying means for conveying a sheet-like member, the stain on the platen or the original conveying surface is troublesome for the operator. It was an inevitable fact.

Therefore, a technique has been developed for cleaning the platen using a recording paper, an ink absorbing roller, etc., after detecting ink adhering to the platen of the ink jet printer by an ink detection sensor.

When an abnormal condition such as a transport jam occurs in a recirculating type document transport device of a copying machine or the like and the abnormal condition exceeds a predetermined level, a maintenance method for the occurred abnormal condition is determined by an operator. Is also known.

[0006]

However, when dirt is generated on the surface of the conveyor belt that conveys a sheet-shaped document or recording paper, a problem arises when the area of the dirt is small or when the length of the conveyor belt is short. This does not occur, but if the length of the transport belt is much longer than the length of the transported medium (sheet), there is a problem that much processing time is required to actually perform the cleaning.

In particular, a predetermined process is performed irrespective of whether the place on the conveyor belt to be cleaned is far from the cleaning roller or the like, or the size of the dirt area. There is a disadvantage that cleaning cannot be completed within a short time.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an image forming apparatus and method capable of completing cleaning promptly regardless of the occurrence of dirt on the sheet-like member conveying surface. It is in.

[0009] Another object of the present invention is to provide a recording medium having a structure in which the length of a surface for conveying a sheet-like member is sufficiently longer than the length of the sheet.
It is an object of the present invention to provide an image forming apparatus and a method capable of reducing a time required for cleaning a contaminated portion on a conveying surface.

[0010]

In order to achieve the above object, an image forming apparatus according to the present invention comprises an image forming apparatus provided with conveying means for conveying a sheet-like member. Dirt detection means for detecting the presence of dirt,
A position detecting unit that outputs position information of the dirt portion detected by the dirt detecting unit; a cleaning unit that removes dirt adhering to the transport unit; and a position detecting unit that outputs position information based on the position information output from the position detecting unit. And control means for moving the contaminated portion of the transport means to the cleaning means.

The invention described above can take various forms listed below.

The sheet member is a recording material for forming an image and / or a sheet original.

[0013] The conveying means is a conveying belt for placing and moving the sheet-like member.

The dirt detecting means is a line sensor or a serial type sensor arranged to be orthogonal to the moving direction of the transport means.

The position detecting means includes a counter for counting the number of driving pulses of a pulse motor for driving the conveying means.

The cleaning means is a cleaning roller provided at a predetermined position of the transport means.

The control means specifies a moving direction of the transport means based on the position information output from the position detection means.

The transport means moves the recording head relative to the recording material.

The recording head is an ink jet head that performs recording by discharging ink.

The recording head is an ink jet head for discharging ink using thermal energy, and has an element for generating thermal energy to be applied to the ink.

The control means may determine that the distance between the position of the dirt determined by the position detection means and the cleaning means is:
The moving direction of the transporting means is determined according to whether or not it is greater than the total length of the transporting means or 全長 of one circumference.

In cleaning the stained portion detected by the dirt detecting means, the cleaning means takes into account a dirt detection error of the dirt detecting means and / or a mechanical error of the cleaning means, and performs the detection. The cleaning is started immediately before the contaminated portion, and the cleaning is completed after passing the contaminated portion by a predetermined amount.

The control means moves the contaminated portion of the transport means to the cleaning means at a speed different from the transport speed during image formation.

The control means, when moving the contaminated portion of the transport means to the cleaning means, selects one of a plurality of moving speeds according to the moving distance.

The control means, when moving the contaminated portion of the transport means to the cleaning means, moves at a higher speed as the moving distance is longer.

When moving the contaminated portion of the transport means to the cleaning means, if the travel distance is shorter than a predetermined distance, the control means moves the contaminated portion at the transport speed at the time of cleaning.

In the image forming apparatus according to the present invention, there is provided an image forming method for forming an image using a conveying means for conveying a sheet-like member, wherein a dirt detecting step for detecting dirt attached to the conveying means is provided. A position detecting step of outputting position information of the dirt portion detected by the dirt detecting step; a cleaning step of removing dirt adhering to the transporting means; and a position detecting step of detecting the position information obtained by the position detecting step. And moving the contaminated portion of the transporting means to the cleaning position in the cleaning step.

The invention described above can take various forms listed below.

The sheet member is a recording material for forming an image and / or a sheet original.

The transport means is a transport belt on which the sheet-like member is placed and moved.

In the dirt detecting step, a line sensor or a serial type sensor arranged so as to be orthogonal to the moving direction of the transport means is used.

In the position detecting step, a counter for counting the number of driving pulses of a pulse motor for driving the transporting means is used.

In the cleaning step, a cleaning roller disposed at a predetermined position of the transport means is used.

In the control step, a moving direction of the transport means is specified based on the position information obtained in the position detecting step.

The transport means moves the recording head relative to the recording material.

The recording head is an ink jet head which performs recording by discharging ink.

The recording head is an ink jet head for discharging ink using thermal energy, and has an element for generating thermal energy to be applied to the ink.

In the control step, it is determined whether or not the distance between the position of the dirt determined in the position detection step and the cleaning position in the cleaning step is larger than 全長 of the entire length or one circumference of the transporting means. The moving direction of the transfer means is determined according to the following.

In the cleaning step, when cleaning the dirt portion detected in the dirt detection step, the dirt detection error generated in the dirt detection step and / or the mechanical error generated in the cleaning step are taken into consideration, and the detected part is detected. The cleaning is started immediately before the contaminated portion, and the cleaning is completed after passing the contaminated portion by a predetermined amount.

In the control step, when the contaminated portion of the transporting means is moved to the cleaning position in the cleaning step, it is moved at a speed different from the transport speed at the time of image formation.

In the control step, when the contaminated portion of the transporting means is moved to the cleaning position in the cleaning step, one of a plurality of moving speeds is selected according to the moving distance.

In the control step, when the contaminated portion of the transport means is moved to the cleaning position in the cleaning step, the conveyed means is moved at a higher speed as the moving distance is longer.

In the controlling step, when the contaminated portion of the conveying means is moved to the cleaning position in the cleaning step, if the moving distance is shorter than a predetermined distance, the conveyed means is moved at the conveying speed at the time of cleaning. .

[0044]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing the entire structure of an ink jet recording apparatus to which the present invention is applied. First, the paper feeding unit of the present inkjet recording apparatus will be described with reference to FIG.

The paper feed section of the present ink jet recording apparatus includes a pressure plate 21 on which the recording paper P is loaded, and a feed rotator 22 for feeding the recording paper P. The pressure plate 21 is used for the base 2
It is rotatable about a rotation axis a connected to the rotation axis 0, and is urged by the pressure plate spring 24 toward the feeding rotating body 22. In order to prevent double feeding of the recording paper P,
A separation pad 25 having a large coefficient of friction is provided. Reference numeral 26 denotes a separation claw for separating the recording paper P. A release cam (not shown) is provided to release the contact between the pressure plate 21 and the feeding rotating body 22.

In the above configuration, the release cam pushes down the pressure plate 21 in the standby state. Thereby, the contact between the pressure plate 21 and the feeding rotating body 22 is released. Then, in this state, when the driving force of the transport roller 32 is transmitted to the feed rotating body 22 and the release cam by a gear (not shown) or the like, the release cam separates from the pressure plate 21 and the pressure plate 21 rises. Then, the feeding rotator 22 and the recording sheet P come into contact with each other, and the recording sheet P is picked up by the rotation of the feeding rotator 22 to start feeding. Then, the feeding rotating body 22 rotates until the recording paper P is sent to the transport unit.

Numeral 90 denotes a feeding rotating body for manual paper feeding. Reference numeral 91 denotes a manual feed tray.

FIG. 2 is an enlarged sectional view showing a part of FIG. Next, the transport unit of the present inkjet recording apparatus will be described with reference to FIGS.

The transport section of the present inkjet recording apparatus has a transport belt 31 for adsorbing and transporting the recording paper P. The transport belt 31 is driven by a drive roller 34 and is wound around a transport roller 32 and a pressure roller 35 which are driven rollers.

A driven pinch roller 33 is provided at a position facing the transport roller 32 via a transport belt 31 in contact therewith. The recording heads 7K (black), 7C (cyan), 7
M (magenta) and 7Y (yellow) are provided.
The resolution of these recording heads is 600 DPI.

Reference numeral 38 denotes a cleaning roller for cleaning the transport belt 31. Numeral 38a is a solenoid for bringing the cleaning roller 38 into contact with the conveyor belt 31 or releasing the contact. 100
Is a dirt detection sensor for checking dirt on the conveyor belt 31. Here, an RGB color line sensor is used. The resolution of each sensor is 300 DPI.

The conveyor belt 31 moves while adsorbing the recording paper P. The transport belt 31 is made of a synthetic resin such as polyethylene, and has an endless belt shape. Numeral 36 denotes a suction force generating means which is fixed so as to face the recording head 7 and has a voltage of about 0.5 kV to 10 kV.
The recording paper P is conveyed to the conveyor belt 3 by applying the
Adhere to 1. The description of the high-voltage generation circuit and the high-voltage control circuit (both not shown) is omitted because they are not directly related to the present invention.

Next, the recording head will be described. As the recording heads 7K, 7C, 7M, and 7Y, line-type inkjet recording heads in which a plurality of nozzles are arranged in a direction intersecting with the conveying direction of the recording paper P, preferably in a direction orthogonal to the conveying direction, are used. , A black recording head 7K, a cyan recording head 7C, a magenta recording head 7M, and a yellow recording head 7Y are arranged at predetermined intervals.

In these heads 7K, 7C, 7M, and 7Y, heat is applied to the ink by the heater, and the ink causes film boiling, and the pressure change caused by the growth or shrinkage of bubbles due to the film boiling causes the recording head to change its recording head. The ink is ejected from the nozzles to form an image on the recording paper P.

Finally, the paper discharge section (see FIG. 1) will be described. The paper discharge unit includes a paper discharge roller 41 and a spur 42. The recording paper P on which the image has been formed is conveyed by being sandwiched between the paper discharge roller 41 and the spur 42, and is discharged to the paper discharge tray 43.

FIG. 3 is an explanatory diagram showing control blocks of the above-described ink jet recording apparatus. In this figure, the same elements as those shown in FIGS. 1 and 2 are denoted by the same reference numerals. That is, 100 is a sensor for detecting contamination of the transport belt, 7K is a recording head for black, 7C is a recording head for cyan, 7M is a recording head for magenta, 7Y.
Is a yellow recording head, and 38a is a solenoid for bringing the cleaning roller 38 into and out of contact with the transport belt 31. Reference numeral 50 denotes a transport belt drive motor (paper feed motor).

Reference numeral 80 denotes a control unit. In the control unit 80, 80a is a CPU and 80b is an R for storing a program.
OM and 80c are RAMs for storing work data and detection data necessary for control, and 80d is a gate array. The gate array 80d is provided with a drive control signal for a transport belt drive motor (paper feed motor) 50, a drive control signal for the cleaning solenoid 38a, an image signal and a control signal for the recording head 7, and a high voltage applied to the transport belt 31. In addition to outputting a control signal, a sensor signal from the conveyance belt dirt detection sensor 100 is read.

FIG. 4 is a flowchart showing a procedure for cleaning the transport belt 31 controlled by the CPU 80a shown in FIG.

First, in step S1, the transport belt 31
Is performed. In step S2, the data output from the dirt detection sensor 100 is checked to determine whether there is dirt. If there is dirt, the process proceeds to step S3. On the other hand, if there is no dirt, the process ends.

In step S3, the dirt on the conveyor belt 31 is moved to a position where the cleaning roller 38 is located. In this movement, the moving direction and the moving speed of the transport belt 31 are controlled so that the moving time is minimized (the details will be described later with reference to FIGS. 5 to 10). In step S4, the cleaning by the cleaning roller 38 is performed.
Perform the tuning operation.

FIG. 5 is an explanatory diagram of step S3 shown in FIG. This figure shows the positional relationship after the end of the dirt detection and, at the same time, the moving direction of the transport belt 31 is changed depending on the position of the dirt on the transport belt 31 (A), (B).
It is shown.

First, the case (A) will be described. Here, dirt on the conveyor belt is indicated by D (1). Since the cleaning roller 38 is located immediately to the right of the dirt D (1), the transport belt 3 is moved in the direction of arrow T1 as shown in the figure.
By moving No. 1 and turning on the cleaning roller solenoid 38a (not shown), dirt D (1) can be quickly removed.

Similarly, in case (B), in order to clean dirt D (2), the transport belt 3 is moved in the direction of arrow T2.
By moving 1, the moving time of the transport belt 31 can be reduced.

FIG. 6 is a diagram for explaining the amount of movement of the conveyor belt 31. This figure is an explanatory view corresponding to the case (A) in FIG.
It is cut at the position of, and the state where it is spread on a plane is drawn.

As shown in FIG. 6, the cleaning roller 3
The distance between 8 and dirt D (1) is CD. Therefore, the actual travel distance to start cleaning is
A value obtained by subtracting a predetermined distance α from the CD (CD−α). The above α is a predetermined constant for starting the cleaning before the stain D (1). That is, α is a value determined in consideration of a mechanical feed error of the transport mechanism including the transport belt 38, a dirt position detection error of the dirt detection sensor 100, a sensor position mounting error, and the like.

Although the horizontal axis in FIG. 6 indicates the length,
Each of the distances shown can correspond to, for example, the number of drive pulses of the transport belt drive motor 50 or another number of clock pulses. Since this correspondence is a well-known technique, detailed description will be omitted.

In FIG. 6, BL is the conveyor belt 31.
, SCL is the distance between the dirt detection sensor 100 and the cleaning roller 38, and SD is the distance between the dirt detection sensor 100 and the dirt D (1). Therefore, the moving distance CD required for cleaning the dirt D (1) can be obtained by calculating CD = SD-SCL.

If the CD is larger than BL / 2,
That is, if CD> BL / 2, the conveyor belt 31 may be moved in the direction of arrow A. If CD <BL / 2, the conveyor belt 31 may be moved in the direction of arrow B.

FIG. 7 is an explanatory diagram showing the relationship between the stain data detected by the stain detection sensor 100 and the stain level (threshold: cleaning start level) serving as a criterion for performing the cleaning operation. In the figure, the stain level takes a value of 0 to 255. In FIG. 7, the level of dirt D (1) is drawn as 12, and the level of dirt D (2) is drawn as 6. The cleaning start level (threshold) is set to level 8.

Therefore, if the level detected by the dirt detection sensor 100 is 8 or more, it is regarded as dirt. On the other hand, if the level is less than 8, it is regarded as a detection error or noise, and no cleaning is performed.

FIG. 8 shows data representing the result of detection of dirt as R
FIG. 4 is a diagram showing a format when stored in an AM 80c (see FIG. 3). In (A) of this figure, the data SD (distance between sensor and dirt) related to the position of dirt is stored together with the detection result for each color component of RGB. In practice, the pulse number of the transport belt drive motor 50 is used as the data SD.

FIGS. 8B and 8C will be described later.

FIG. 9A is a diagram showing a detection area on the conveyor belt 31. In this drawing, as in FIG. 6 described above, the transport belt 31 is depicted in a state where it is cut and spread in a planar shape. That is, the surface of the transport belt 31 is divided into a plurality of areas, and the presence or absence of dirt is determined for each area, and cleaning is performed. Here, a square having a length a is defined as one area.

FIG. 9B shows the cleaning roller 38.
FIG. 7 is an explanatory diagram of the cleaning operation by the maker. The horizontal axis of the figure represents time. Here, the transport belt 31 when moving the dirty portion to the cleaning roller 38 is used.
Is set to Vm, and the moving speed of the conveyor belt 31 during the cleaning by the cleaning roller 38 is set to Vc. As shown in the figure, when the conveyor belt 31 is moved starting from the dirt position, the conveyor belt 31 can be moved to the cleaning start position after a time CD / Vm. Thereafter, the cleaning roller solenoid 38a is turned on to start cleaning. As a result, the cleaning roller 38
The cleaning is performed at the speed Vc while keeping the contact with the transport belt 31. Cleaning time a / Vc
After the time elapses, the solenoid 38a is turned off to end the cleaning.

As described in the description of FIG. 6, the mechanical feed error of the transport mechanism including the transport belt 38, the dirt position detection error of the dirt detection sensor 100, the sensor position mounting error, and the like are taken into consideration. Start the cleaning process α minutes before, and then clean the stained portion α
It is also possible to end the cleaning after passing by the minute. In this case, the ON duration time of the solenoid 38a is (a + 2α) / Vc.

FIG. 9C will be described later.

(Embodiment 2) In Embodiment 1, FIG.
(A) has been described, but the format of the stain data may be C (cyan), M (magenta), Y (yellow), or Bk (black) as shown in FIG. is there. As the information indicating the position of the dirt, the position on the conveyor belt may be represented by a two-dimensional X and Y address as shown in the figure.

In the case of recording using only black ink, color component information of only Bk (black) can be used as shown in FIG. 8C. FIG.
In (C), the number of pixels L is used instead of the number of pulses of the motor as a unit indicating the position information of dirt.

(Embodiment 3) In the first embodiment, the drive (on / off) timing of the cleaning roller solenoid 38a is determined by time. However, as shown in FIG. The timing may be set at (CD). In this case, the continuation time for turning on the solenoid 38a is, as shown in FIG.
Becomes

(Embodiment 4) In the first embodiment, a sensor having a resolution of 300 DPI was used as the dirt detection sensor 100.
The resolution may be 0 DPI. Conversely, a low-resolution sensor such as 200 DPI can be used with priority given to cost.

Although the line sensor is used in the first embodiment, a serial type sensor may be used instead.

(Embodiment 5) In the first embodiment, the recording head is of a line type in which the arrangement direction of the nozzle rows is substantially perpendicular to the transport direction. However, the direction of the nozzle rows is the transport direction. The recording head may be a serial type recording head mounted on a carriage that reciprocates in a direction substantially parallel to and substantially perpendicular to the transport direction.

(Embodiment 6) In Embodiment 1, FIG.
As described above, the dirt level is set to 0 to 255, but may be set to, for example, 64 levels. Although the cleaning start level (threshold value) is set to 8, it may be set to another value in consideration of the sensitivity of the dirt detection sensor, the ink reflection characteristics, and the like.

(Embodiment 7) In Embodiment 1, FIG.
As described in (B), the moving speed of the transport belt before the start of cleaning is set to Vm (one type), but a plurality of moving speeds can be set.

For example, according to the distance CD (see FIG. 6) between the position of the dirty portion and the cleaning roller 38, FIG.
0, the moving speed is Vm1, Vm2, Vm3.
(However, three types of Vm1 <Vm2 <Vm3) may be used. In the moving speed control flow before cleaning shown in FIG. 10, two threshold values BL / 8 and BL / 4 are used to select the moving speed (BL = total belt length:
See FIG. 6).

That is, first, the moving distance is checked in step S10. As a result, if the moving distance is larger than 0 and B
If L / 8 or less, the process proceeds to step S12 and the speed Vm
Select 1. Also, if the moving distance is larger than BL / 8, B
If L / 4 or less, the process proceeds to step S3 and the speed Vm2
Select Further, if the moving distance is longer than BL / 4, the process proceeds to step S13 to select the speed Vm3.

As described above, the longer the moving distance, the faster the moving speed of the conveyor belt, so that the time required for cleaning can be reduced.

When the moving distance is very short (that is, when the dirty portion is near the cleaning roller 38), Vm1 = Vc (Vc is the speed at the time of executing the cleaning: see FIG. 9). In other words, in this case, the cleaning operation is immediately started.

The relationship between the transport speed during image formation and the above-mentioned moving speed is Vp <Vm, where Vp is the transport speed during image formation. In addition, three types of Vm1, Vm2, and Vm3 (Vm1 <Vm2 <V
m3), for example, Vm1 <Vp <Vm2
<Vm3 is also possible.

(Other Embodiments) In the embodiments described above, an ink jet recording apparatus has been described as an example. However, the present invention can be applied to a copying machine, a facsimile machine, and the like. Of course.

Further, in the embodiments described above, the case where the recording paper is transported using the transport belt has been described. However, the present invention is also applicable to the case where a sheet-like member such as a document is transported in a copying machine or the like. Of course, the invention can be applied.

Further, as a means for conveying the sheet-like member, a conveying belt has been described as an example. However, the means is not limited to a flexible belt such as a conveying belt. It is needless to say that the transporting means can be adopted.

(Effects of the Embodiments) According to the embodiments of the present invention described above, the dirt of the conveying means is detected from the detection data, and the shortest moving direction is determined from the position. Can be moved. In addition, since the moving is performed at a predetermined moving speed, the preparation for the cleaning operation is completed quickly. This leads to a reduction in the time required for cleaning the device. In particular, the present embodiment is very effective because the moving time is not ridiculous for a large recording apparatus.

Further, since the cleaning can be performed only on the stained portion, the required time is further shortened.
Further, since the moving speed of the transporting means can be appropriately selected according to the required moving distance, not only the accuracy but also the effect of reducing the noise at the time of moving can be obtained.

In addition, data on the position, color and level of dirt is stored in advance so that more accurate detection and cleaning can be performed.

Further, since the type of the dirt detection sensor to be used is not limited (that is, it may be an RGB sensor or a monochrome sensor), it can be selected according to the use form of the apparatus.

There is no particular limitation on the resolution of the sensor. Therefore, if there is no problem in cost,
By increasing the resolution of the sensor and checking with a large amount of data, more accurate cleaning becomes possible.

(Others) It should be noted that the present invention includes a means (for example, an electrothermal converter or a laser beam) for generating thermal energy as energy used for performing ink ejection, particularly in an ink jet recording system. An excellent effect is obtained in a recording head and a recording apparatus of a type in which the state of ink is changed by the thermal energy. This is because according to such a method, it is possible to achieve higher density and higher definition of recording.

The typical configuration and principle are described in, for example, US Pat. Nos. 4,723,129 and 4,740.
It is preferable to use the basic principle disclosed in the specification of Japanese Patent No. 796. This method is a so-called on-demand type,
Although it can be applied to any type of continuous type, in particular, in the case of the on-demand type, it can be applied to a sheet holding liquid (ink) or an electrothermal converter arranged corresponding to the liquid path. By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise exceeding nucleate boiling, heat energy is generated in the electrothermal transducer, and film boiling occurs on the heat acting surface of the recording head. Liquid (ink) corresponding to this drive signal on a one-to-one basis.
This is effective because air bubbles inside can be formed. The liquid (ink) is ejected through the ejection opening by the growth and contraction of the bubble to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of a liquid (ink) having particularly excellent responsiveness can be achieved, which is more preferable. As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. Further, if the conditions described in US Pat. No. 4,313,124 relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of the discharge port, the liquid path, and the electrothermal converter (linear liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned respective specifications, U.S. Pat. No. 4,558,333 and U.S. Pat. No. 44,558 which disclose a configuration in which a heat acting portion is arranged in a bending region.
A configuration using the specification of Japanese Patent No. 59600 is also included in the present invention. In addition, Japanese Unexamined Patent Application Publication No. 59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal converter for a plurality of electrothermal converters, and an aperture for absorbing a pressure wave of thermal energy is provided. The effect of the present invention is effective even if the configuration is based on JP-A-59-138461, which discloses a configuration corresponding to a discharge unit. That is, according to the present invention, recording can be reliably and efficiently performed regardless of the form of the recording head.

Further, the full-line type recording head as described above may be either a configuration that satisfies the length by combining a plurality of recording heads, or a configuration as a single recording head that is integrally formed. .

In addition, the present invention can be effectively applied to a serial type recording apparatus. Also, a print head fixed to the apparatus main body, or a replaceable chip type print head which is attached to the apparatus main body to enable electrical connection with the apparatus main body and supply of ink from the apparatus main body, or The present invention is also effective for a recording apparatus using a cartridge type recording head in which an ink tank is provided integrally with the recording head itself.

It is preferable to add a recording head ejection recovery means, a preliminary auxiliary means, and the like as the configuration of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. If these are specifically mentioned, the recording head is heated using capping means, cleaning means, pressurizing or suction means, an electrothermal transducer, another heating element or a combination thereof. Pre-heating means for performing the pre-heating and pre-discharging means for performing the discharging other than the recording can be used.

The type and number of recording heads to be mounted are not limited to those provided only for one color ink, for example, and for a plurality of inks having different recording colors and densities. A plurality may be provided. That is, for example, the printing mode of the printing apparatus is not limited to a printing mode of only a mainstream color such as black, but may be any of integrally forming a printing head or a combination of a plurality of printing heads. The present invention is also very effective for an apparatus provided with at least one of the recording modes of full color by color mixture.

In addition, in the embodiments of the present invention described above, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower and which softens or liquefies at room temperature may be used. In general, the ink jet system generally controls the temperature of the ink itself within a range of 30 ° C. or more and 70 ° C. or less to control the temperature so that the viscosity of the ink is in a stable ejection range. Sometimes, the ink may be in a liquid state. In addition, in order to positively prevent temperature rise due to thermal energy by using it as energy for changing the state of the ink from a solid state to a liquid state, or to prevent evaporation of the ink, the ink is solidified in a standing state and heated. May be used. In any case, the application of heat energy causes the ink to be liquefied by the application of the heat energy according to the recording signal and the liquid ink to be ejected, or to start solidifying when it reaches the recording medium. The present invention is also applicable to a case where an ink having a property of liquefying for the first time is used. In such a case, the ink
JP-A-54-56847 or JP-A-60-7
As described in Japanese Patent Publication No. 1260, it is also possible to adopt a form in which the sheet is opposed to the electrothermal converter in a state where it is held as a liquid or solid substance in the concave portion or through hole of the porous sheet. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition, the form of the ink jet recording apparatus of the present invention is not limited to those used as image output terminals of information processing equipment such as computers, copying apparatuses combined with readers and the like, and facsimile apparatuses having a transmission / reception function. It may take a form.

[0108]

As described above, according to the present invention, even when the length of the surface on which the sheet-like member is conveyed is sufficiently longer than the length of the sheet, it is possible to clean the contaminated portion on the conveying surface. The required time can be reduced.

Further, according to the present invention, it is possible to quickly complete the cleaning, no matter where the dirt is formed on the sheet-like member conveying surface.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of an inkjet recording apparatus to which the present invention has been applied.

FIG. 2 is an enlarged detailed sectional view of a conveyance unit of the recording apparatus in FIG.

FIG. 3 is a block diagram illustrating a control unit of the printing apparatus in FIG. 1;

FIG. 4 is a flowchart illustrating a cleaning procedure of the recording apparatus in FIG. 1;

FIG. 5 is an explanatory diagram of the operation of the recording apparatus in FIG. 1;

FIG. 6 is a diagram illustrating a transport belt of the recording apparatus in FIG.

FIG. 7 is a diagram illustrating a cleaning start level (threshold) of the printing apparatus in FIG. 1;

FIG. 8 is an explanatory diagram regarding stain data.

FIG. 9 is a diagram illustrating the operation of the recording apparatus in FIG. 1;

FIG. 10 is a flowchart showing a procedure for determining a conveyance speed of the printing apparatus in FIG. 1;

[Explanation of symbols]

 7K Black recording head 7C Cyan recording head 7M Magenta recording head 7Y Yellow recording head 31 Conveyor belt 34 Drive roller 36 Attraction force generating means 38 Cleaning roller 38a Cleaning solenoid 50 Transport belt drive motor (transport motor) 80a CPU 80b ROM 80c RAM 80d Gate array 100 Dirt detection sensor

Claims (32)

[Claims]
1. An image forming apparatus comprising a conveying unit for conveying a sheet member, a dirt detecting unit for detecting dirt adhering to the conveying unit, and a position of a dirt portion detected by the dirt detecting unit. Position detecting means for outputting information; cleaning means for removing dirt adhering to the transporting means; cleaning means for cleaning a dirty portion of the transporting means based on the position information output from the position detecting means. An image forming apparatus, comprising: a control unit that moves the image forming apparatus to the position.
2. The image forming apparatus according to claim 1, wherein the sheet-shaped member is a recording material for forming an image and / or a sheet-shaped original.
3. The image forming apparatus according to claim 1, wherein the transport unit is a transport belt that places and moves the sheet member.
4. The image forming apparatus according to claim 1, wherein the dirt detecting unit is a line sensor or a serial type sensor arranged to be orthogonal to a moving direction of the transporting unit.
5. The image forming apparatus according to claim 1, wherein the position detection unit includes a counter that counts the number of drive pulses of a pulse motor that drives the conveyance unit.
6. An image forming apparatus according to claim 1, wherein said cleaning means is a cleaning roller disposed at a predetermined position of said transport means.
7. The image forming apparatus according to claim 1, wherein the control unit specifies a moving direction of the transport unit based on the position information output from the position detection unit.
8. The image forming apparatus according to claim 1, wherein the conveying unit moves the recording head relative to a recording material.
9. The image forming apparatus according to claim 8, wherein the recording head is an inkjet head that performs recording by discharging ink.
10. The image according to claim 9, wherein the recording head is an inkjet head that ejects ink using thermal energy, and has an element that generates thermal energy to be applied to the ink. Forming equipment.
11. The control device according to claim 1, wherein the control unit determines whether a distance between the position of the dirt determined by the position detection unit and the cleaning unit is greater than 全長 of the entire length of the transport unit or one half of one circumference. An image forming apparatus, wherein a moving direction of the transporting means is determined according to whether or not the image is formed.
12. The cleaning unit according to claim 1, wherein the cleaning unit cleans a dirt portion detected by the dirt detection unit and / or a mechanical error of the cleaning unit. The image forming apparatus according to claim 1, wherein the cleaning is started before the detected dirty portion, and the cleaning is completed after passing through the dirty portion by a predetermined amount.
13. The image forming apparatus according to claim 1, wherein the control unit moves the contaminated portion of the transport unit to the cleaning unit at a speed different from a transport speed during image formation. .
14. The control unit according to claim 13, wherein the control unit, when moving the contaminated portion of the transport unit to the cleaning unit,
An image forming apparatus, wherein one of a plurality of moving speeds is selected.
15. The image forming apparatus according to claim 14, wherein the control unit moves the contaminated portion of the transport unit to the cleaning unit at a higher speed as the moving distance is longer.
16. The cleaning device according to claim 13, wherein the control unit moves the contaminated portion of the conveying unit to the cleaning unit, and when the moving distance is shorter than a predetermined distance, the control unit controls the conveying speed during cleaning. An image forming apparatus characterized in that the image forming apparatus is moved by (1).
17. An image forming method in which an image is formed using a conveying unit that conveys a sheet-like member, wherein a dirt detecting step of detecting dirt attached to the conveying unit; A position detecting step for outputting position information of the contaminated portion; a cleaning step for removing contaminants adhering to the conveying unit; and a contaminated portion of the conveying unit based on the position information obtained in the position detecting step. And a control step of moving the image forming apparatus to a cleaning position in the cleaning step.
18. The image forming method according to claim 17, wherein the sheet member is a recording material for forming an image and / or a sheet document.
19. The image forming method according to claim 17, wherein said conveying means is a conveying belt for placing and moving said sheet-like member.
20. The image forming method according to claim 17, wherein the dirt detecting step uses a line sensor or a serial type sensor arranged so as to be orthogonal to the moving direction of the conveying means.
21. The image forming method according to claim 17, wherein the position detecting step uses a counter that counts the number of driving pulses of a pulse motor that drives the transport unit.
22. The image forming method according to claim 17, wherein said cleaning step uses a cleaning roller disposed at a predetermined position of said transport means.
23. The image forming method according to claim 17, wherein the control step specifies a moving direction of the transport unit based on the position information obtained in the position detecting step.
24. The image forming method according to claim 17, wherein said conveying means moves the recording head relative to a recording material.
25. The image forming method according to claim 24, wherein the recording head is an inkjet head that performs recording by discharging ink.
26. The image according to claim 25, wherein the recording head is an inkjet head that ejects ink using thermal energy, and has an element that generates thermal energy to be applied to the ink. Forming method.
27. The method according to claim 17, wherein the control step is such that a distance between the position of the dirt obtained in the position detecting step and a cleaning position in the cleaning step is equal to one full length or one circumference of the transporting means. The image forming method according to claim 1, wherein the moving direction of the conveying unit is determined depending on whether the moving direction is greater than / 2.
28. The cleaning method according to claim 17, wherein in the cleaning step, when the dirt portion detected in the dirt detection step is cleaned,
In anticipation of a dirt detection error generated in the dirt detection step and / or a mechanical error generated in the cleaning step, cleaning is started immediately before the detected dirt part, and cleaning is completed after passing the dirt part by a predetermined amount. An image forming method.
29. The image forming apparatus according to claim 17, wherein, when the contaminated portion of the conveying means is moved to a cleaning position in the cleaning step, the control step moves the contaminated portion at a speed different from a conveying speed during image formation. Image forming method.
30. The moving speed according to claim 29, wherein, when the contaminated portion of the transporting means is moved to a cleaning position in the cleaning step, any one of a plurality of moving speeds is selected according to the moving distance. An image forming method, wherein one speed is selected.
31. The apparatus according to claim 30, wherein in the control step, when the contaminated portion of the transport means is moved to a cleaning position in the cleaning step, the conveyed portion is moved at a higher speed as the moving distance is longer. Image forming method.
32. The cleaning method according to claim 29, wherein, when the contaminated portion of the transporting means is moved to a cleaning position in the cleaning step, if the moving distance is shorter than a predetermined distance, the control step may perform cleaning. An image forming method characterized in that the image forming apparatus is moved at a conveying speed at the time.
JP9369125A 1997-12-29 1997-12-29 Image forming device and method Pending JPH11192768A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9369125A JPH11192768A (en) 1997-12-29 1997-12-29 Image forming device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9369125A JPH11192768A (en) 1997-12-29 1997-12-29 Image forming device and method

Publications (1)

Publication Number Publication Date
JPH11192768A true JPH11192768A (en) 1999-07-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP9369125A Pending JPH11192768A (en) 1997-12-29 1997-12-29 Image forming device and method

Country Status (1)

Country Link
JP (1) JPH11192768A (en)

Cited By (12)

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EP1160091A1 (en) * 2000-05-30 2001-12-05 Hewlett-Packard Company Dual-web transport belt cleaning apparatus and method
EP1160089A1 (en) * 2000-05-30 2001-12-05 Hewlett-Packard Company Transport belt cleaning module using serviceable cleaning implements
JP2002308456A (en) * 2001-04-19 2002-10-23 Toshiba Corp Paper sheet separation mechanism and automatic ticket checking and collecting device
EP1628835A1 (en) * 2003-05-30 2006-03-01 Ricoh Company, Ltd. Image forming apparatus
CN100372683C (en) * 2004-09-08 2008-03-05 富士施乐株式会社 Image recording apparatus
US7407279B2 (en) 2002-03-06 2008-08-05 Brother Kogyo Kabushiki Kaisha Image forming apparatus and cleaning method thereof
JP2010058280A (en) * 2008-09-01 2010-03-18 Brother Ind Ltd Recorder
US7778566B2 (en) 2005-06-21 2010-08-17 Brother Kogyo Kabushiki Kaisha Belt cleaning device and image forming apparatus
JP2014189352A (en) * 2013-03-26 2014-10-06 Kyocera Document Solutions Inc Belt cleaning device and image formation device
JP2014189351A (en) * 2013-03-26 2014-10-06 Kyocera Document Solutions Inc Belt cleaning device and image formation device
JP2014188726A (en) * 2013-03-26 2014-10-06 Kyocera Document Solutions Inc Belt cleaning device and image formation device
US9199496B2 (en) 2013-03-26 2015-12-01 Kyocera Document Solutions Inc. Belt cleaner and image forming apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1160089A1 (en) * 2000-05-30 2001-12-05 Hewlett-Packard Company Transport belt cleaning module using serviceable cleaning implements
EP1160091A1 (en) * 2000-05-30 2001-12-05 Hewlett-Packard Company Dual-web transport belt cleaning apparatus and method
US6679601B1 (en) 2000-05-30 2004-01-20 Hewlett-Packard Development Company, L.P. Dual-web transport belt cleaning apparatus and method
JP2002308456A (en) * 2001-04-19 2002-10-23 Toshiba Corp Paper sheet separation mechanism and automatic ticket checking and collecting device
US7407279B2 (en) 2002-03-06 2008-08-05 Brother Kogyo Kabushiki Kaisha Image forming apparatus and cleaning method thereof
EP1628835A4 (en) * 2003-05-30 2008-06-11 Ricoh Kk Image forming apparatus
EP1628835A1 (en) * 2003-05-30 2006-03-01 Ricoh Company, Ltd. Image forming apparatus
CN100372683C (en) * 2004-09-08 2008-03-05 富士施乐株式会社 Image recording apparatus
US7778566B2 (en) 2005-06-21 2010-08-17 Brother Kogyo Kabushiki Kaisha Belt cleaning device and image forming apparatus
JP2010058280A (en) * 2008-09-01 2010-03-18 Brother Ind Ltd Recorder
JP4706739B2 (en) * 2008-09-01 2011-06-22 ブラザー工業株式会社 Recording device
US8287084B2 (en) 2008-09-01 2012-10-16 Brother Kogyo Kabushiki Kaisha Recording apparatus
JP2014189352A (en) * 2013-03-26 2014-10-06 Kyocera Document Solutions Inc Belt cleaning device and image formation device
JP2014189351A (en) * 2013-03-26 2014-10-06 Kyocera Document Solutions Inc Belt cleaning device and image formation device
JP2014188726A (en) * 2013-03-26 2014-10-06 Kyocera Document Solutions Inc Belt cleaning device and image formation device
US9199496B2 (en) 2013-03-26 2015-12-01 Kyocera Document Solutions Inc. Belt cleaner and image forming apparatus

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