JPH0717097A - Recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents contact between the recording head and recording paper during recording operation, prevents ink stains on the recording paper and damages to the dot forming elements of the recording head, and improves reliability of the recording apparatus. Maintain the quality of recorded materials. A guide member 12 for adhering the recording sheet 2 to the platen roller 5 is provided upstream of the recording head 1 in the sheet conveying direction, and when recording on the recording sheet 2 is completed, a rear end portion of the recording sheet 2 is a guide member. While being sandwiched between 12,
The recording head 1 is retracted from the recording paper 2, and the recording paper 2 is fed in the ejection direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus for recording on a recording material by recording means.

[0002]

2. Description of the Related Art A recording device having functions such as a printer, a copying machine and a facsimile, or a recording device used as an output device of a multifunction machine or a workstation including a computer, a word processor, etc., is a sheet or a plastic thin plate based on image information. An image (including characters and symbols) is recorded on a recording material (recording medium) such as (OHP). The recording device can be classified into an ink jet type, a wire dot type, a heat sensitive type, a thermal transfer type, a laser beam type and the like depending on the recording system of the recording means used.

In a serial type recording apparatus which employs a recording system in which a main scanning is performed in a direction intersecting a conveying direction (sub-scanning direction) of a recording material, the recording material is set at a predetermined recording position and then the recording material is set. An image (including characters, symbols, etc.) is recorded by a recording unit (recording head) mounted on a carriage that moves (main scanning) along, and after one line of recording is completed, a predetermined amount of paper is fed (sub-scan). An image is recorded in a desired range of the recording material by repeating the operation of performing (scanning) and then recording (main scanning) the image of the next row. On the other hand, in a line type recording apparatus that records a recording material only in the sub-scanning direction in which the recording material is fed in the transport direction, the recording material is set at a predetermined recording position, and one line of recording is continuously performed at one time. A predetermined amount of paper feed (pitch feed) is performed, and an image is recorded on the entire recording material.

Among them, the ink jet type (ink jet recording apparatus) is a means for recording by ejecting ink from a recording means (recording head) onto a recording material, and it is easy to make the recording means compact and high definition. Images can be recorded at high speed, plain paper can be recorded without requiring special processing, running costs are low, and the non-impact method reduces noise and uses multicolor inks. Therefore, it has an advantage that it is easy to record a color image.

In particular, an ink jet type recording means (recording head) for ejecting ink by utilizing heat energy,
Through the semiconductor manufacturing process such as etching, vapor deposition, and sputtering, the electrothermal converter formed on the substrate, the electrode,
By forming the liquid passage wall, the top plate, and the like, it is possible to easily manufacture a liquid discharge device having a high-density liquid passage arrangement (ejection port arrangement), and to further reduce the size. Further, by utilizing the advantages of IC technology and micro processing technology, it is easy to make the recording means long and planar (two-dimensional), and it is also easy to make the recording means full-multi and high-density mounting. is there.

A recording device including an ink jet recording device can be divided into a serial type recording device and a line type recording device as described above. Of these, the line type recording device has a complicated mechanical section for scanning a carriage. Since it is not necessary and high-speed recording can be performed, it is often used especially in a recording device for recording a large amount of recording.
In a line type inkjet recording apparatus, it is necessary to provide a paper pressing unit for preventing the recording material from rising and to maintain the distance between the recording head and the recording material (paper distance) with high accuracy. This is a very effective technique for improving.

In particular, when a so-called full-multi recording head in which the discharge ports of the recording material in the entire paper width are collectively formed on the same substrate is used, the recording area becomes a thin linear shape. There are very few parts that need to be held flatly, and therefore accurate recording can be performed simply by providing a paper guide or other paper retainer on the upstream side without providing a special paper retainer on the downstream side. There is an advantage.

In an ink jet recording apparatus, the ink on the recording material may not yet be dried immediately after recording. If such a recording material is touched, the image may be disturbed or the ink may adhere to the hand. There is. Especially, if the recording speed is high such as line type recording device,
The second recording material may overlap before the ink of the second recording material dries, and the back surface of the recording material may become dirty. In order to eliminate these inconveniences, an inkjet recording apparatus (especially a model for high-speed recording) requires a means for forcibly drying the ink on the recording material and fixing it early.

As a means for drying and fixing the ink,
The heat fixing method is mainly used. In an inkjet recording device, if the recording surface is touched before the ink dries, image distortion may occur.Therefore, a heater is brought into contact with the back surface of the recording surface of the recording material to dry the ink on the recording surface early. The method of letting is adopted. In that case, for example, one sheet-shaped heater having the same width as the recording material and having a temperature capable of drying the entire ink is brought into contact with the entire surface, and a very small contact area such as a plurality of points or lines. By pressing the recording surface of the sheet heater, the heat is efficiently transmitted.

In a recording apparatus mainly incorporated in a facsimile machine, a thermal paper, which is a recording material, develops color when heated by a thermal head and records an image (including characters) on the color development part. Widely used. By the way, the above thermal paper has a disadvantage that the recorded image is discolored when stored for a long period of time, and in order to fundamentally improve this,
Plain paper facsimiles that employ an electrophotographic method or an inkjet recording method for recording with a fading-resistant toner in a recording system have been developed and are becoming popular.

[0011]

However, when recording on a cut sheet with the full-multi recording head, it is possible to easily maintain the distance between sheets at the time of recording only with the paper guide. When the trailing edge leaves the paper guide, the paper pressing means disappears. For example, if the recording material has curled, the trailing edge of the recording material with the bent habit released is the ejection port surface of the recording head. There is a risk of collision, causing ink to adhere to the recording material to stain the image, or damaging the ejection port or adhering dust to break the recording head.

Incidentally, such a problem can be solved by providing a paper pressing means also on the downstream side of the recording head. However, such a phenomenon (defective) is caused by the paper guide tip and the ejection port surface end. Since it is only a small distance between the parts, it is uneconomical to provide the paper pressing means on the downstream side only to solve the above-mentioned problems, and it is not possible to take advantage of the bending angle.

An object of the present invention is to solve such a technical problem, and when the recording is performed up to the trailing edge of the recording surface of the recording material, the recording material is stopped and the recording means is covered. By retreating the recording material away from the recording material and then again conveying the recording material and discharging the recording material, a collision between the recording means and the recording material is prevented.

Next, in the conventional ink jet recording apparatus having the fixing means composed of the above-mentioned sheet heater, since the recording material is pressed against the sheet heater by a plurality of dots or lines, the portion to be pressed is There is a technical problem that the heat transfer is good in the vicinity thereof, but the heat transfer is not so good in the non-pressed portion, and the heat efficiency of the fixing unit is low due to such variations in heat transfer.

Further, there is a characteristic that the dot diameter of the ink droplet after recording increases as it permeates the recording material. Therefore, in the above-mentioned conventional technique in which the heat transfer varies, the dot diameter becomes small in the portion that is rapidly heated before the ink droplets penetrate, and the dot diameter becomes large in the portion that is gradually heated. There is also an inconvenience that the variation in the size of appears as uneven density in appearance. Furthermore, since the fixing speed is partially different due to the different heat transfer speed, there is also a disadvantage that the amount of elongation of the recording material is different, which causes corrugation (longitudinal wrinkling) of the recording material.
That is, in the conventional example, there is a technical problem that the difference in how heat is transmitted affects an image and the image quality is deteriorated by heat fixing.

The inventions of claims 4 to 12 are intended to solve such a technical problem, and the recording material can be uniformly pressed against the heating element to enhance the heat transfer efficiency. Accordingly, the present invention provides an inkjet recording apparatus capable of improving the fixing speed, preventing the occurrence of density unevenness due to fixing, and preventing the occurrence of waviness of the recording material due to fixing.

Next, in a recording apparatus mainly built in a facsimile apparatus, as a recording material to be used recently,
Despite being a thermal paper, it has been developed to be very resistant to fading and to have a texture similar to that of plain paper. Although this thermal paper is an excellent recording material in which the conventional drawbacks have been eliminated, it may be mistaken as plain paper by the user. Therefore, if this recording material is erroneously used in a facsimile using an electrophotographic method, for example, it will be heated by the built-in heat fixing section, and the recording surface will be blackened almost entirely, and normal recording data There was a possibility of an accident in which the text was unreadable. Facsimile devices are often recorded and communicated without the user being near the device, so even if the above-mentioned problems occur, they may not be noticed for a long time, which is a major problem in information transmission. There was a risk of obstacles.

The inventions of claims 13 to 23 are intended to solve such a technical problem, and an accident in which a user mistakenly inserts a thermal paper and an unreadable record is made. It can be effectively prevented, and in particular, it has a remarkable effect in a facsimile machine in which unmanned data transmission and recording are often performed, and it can greatly contribute to the improvement of reliability of the entire communication system while preventing the above trouble. The present invention provides a possible recording device.

[0019]

According to a first aspect of the present invention, there is provided an ink jet recording apparatus for performing recording by ejecting ink from a recording means to a recording material, the recording material being provided upstream of a recording means in a conveying direction. A guide member for bringing the recording medium into contact with the conveying means, a moving means for retracting the recording means in a direction away from the recording material, and a control means for operating the conveying means and the moving means. When the rear end portion is held by the guide member, the recording means is retracted by the moving means and the recording material is conveyed, so that the collision between the recording means and the recording material is reliably prevented. The present invention provides a possible inkjet recording device.

According to a fourth aspect of the present invention, in an ink jet recording apparatus for recording by ejecting ink from a recording means to a recording material, a heating means is provided downstream of a recording position in the recording material conveying direction, Inside the heating means, a heating element having a curved surface in which a central portion in a direction perpendicular to the recording material conveyance direction is higher than both ends and has a convex shape, and at least 2 of the recording material.
And a conveying means for conveying the recording material in contact with a point,
By the constitution in which the conveying means presses the back surface of the recording material against the heating element and applies tension to the recording material in an outward direction at a right angle to the conveying direction, the recording material is uniformly pressed against the heating element to generate heat. It is an object of the present invention to provide an inkjet recording apparatus capable of increasing the transmission efficiency of the recording medium, increasing the fixing speed, and preventing uneven density and waviness of the recording material due to fixing.

That is, according to the inventions of claims 4 to 12, in the fixing means of the ink jet recording apparatus for fixing the ink by heating the back surface of the recording material against the heater (heating element), the heater is passed in the width direction. By making the central portion of the so-called convex shape higher than both ends, so-called a semi-cylindrical shape, and applying a force to pull both ends of the recording material to the outside when the recording material passes by ,
The recording material is evenly pressed against the heater so that heat can be efficiently transferred.

According to the thirteenth to twenty-third aspects of the invention, the recording is provided with a paper feeding means for supplying the recording material, a conveying means for conveying the recording material, a recording means for recording on the recording material, and a heat fixing means. In the apparatus, by providing density detecting means for detecting the background color of the recording material on both the downstream side or the upstream side and the downstream side of the recording means in the conveying direction,
It is possible to effectively prevent an accident where a user mistakenly inserts a thermal paper to cause unreadable recording, which is particularly remarkable in a facsimile machine in which unmanned data transmission and recording are often performed. (EN) A recording apparatus that is effective and can contribute to the improvement of reliability of the entire communication system while preventing the above trouble.

That is, in the inventions of claims 13 to 23, in order to prevent the above-mentioned accident when the thermal paper is inserted by mistake, a blank portion is provided on the downstream side of the heat fixing portion in the recording material conveyance direction. A density sensor is installed at the correct position to monitor the density of the recording material discharged, detect errors such as blackening of the entire surface that occurs when the thermal paper is used by mistake, and activate warning means such as a buzzer sound. It is also intended to provide a recording device capable of taking measures such as temporarily storing the recorded data in the memory unit without erasing the recorded data to prevent the recorded data from being destroyed.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view showing a configuration in the vicinity of a recording means of an embodiment of an ink jet recording apparatus to which the invention of claim 1 is applied. In FIG. 1, recording means 1 of the present embodiment
For this, a full multi recording head having dot forming elements (ejection ports, etc.) over the entire width of the recording material 2 is used. Reference numeral 3 denotes an ink tank, and the ink 4 held in the ink tank 3 is supplied to the recording head 1 via a supply pipe (not shown).

The recording material 2 is conveyed in the direction of arrow A through the recording portion by the conveying means composed of the platen roller 5, the registration roller 6 and the like, and is sequentially recorded during that time. The recording material 2 is formed on the peripheral surface of the platen roller 5.
A pinch roller 7 is provided to apply a frictional conveying force to the.

The recording head (recording means) 1 is an ink jet recording head which discharges ink by utilizing heat energy, and is provided with an electrothermal converter for generating heat energy. In addition, the recording head 1
Is for recording by causing film boiling in the ink by the thermal energy applied by the electrothermal converter and ejecting the ink from the ejection port by utilizing the pressure change due to the growth and contraction of bubbles generated at that time. Is.

FIG. 2 is a partially cutaway perspective view schematically showing the structure of the ink ejection portion of the recording head 1. In FIG. 2, the recording head 1 is fixed to the electrothermal converter 82 and electrodes (not shown) formed on the substrate 81 through the semiconductor manufacturing process steps such as etching, vapor deposition, and sputtering, and the substrate 81. The liquid passage wall 84, the top plate 85 fixed to the liquid passage wall 84, and the like. The ink 4 is supplied from the ink tank 3 through the supply pipe into the common liquid chamber 87 of the recording head 1. This common liquid chamber 8
7 communicates with a plurality of discharge ports 89 via respective liquid passages 86. The electrothermal converter 82 is disposed inside each liquid passage 86.

Ink 4 supplied into the common liquid chamber 87
Is supplied into each liquid passage 86 by what is called a capillary phenomenon, and is stably held by forming a meniscus at the tip (ejection port 89) of each liquid passage 86. Each liquid path 86 is the recording head 1
Has an opening at the front surface (ejection port surface) 88, and the ejection port 89 is formed by each opening. By energizing the electrothermal converter 82 here, the ink on the electrothermal converter 82 is rapidly heated, bubbles are generated in the liquid path 86, and the ink is ejected from the ejection port 89 by the expansion and contraction of the bubbles. It is ejected to form flying droplets. A desired image is recorded by ejecting ink from the desired ejection port 89 to the recording material 2 based on the recording information. In the case of a full multi line head, the ejection port 89 is
It is formed over the entire recording width at a density of 6 / mm or 400 / inch.

In FIG. 1, reference numeral 8 denotes a capping means, and a rubber-like elastic cap 9 is brought into pressure contact with an ejection port surface 88 of the recording head 1 to cover the ejection port 89 in a hermetically sealed state. Prevents ink from drying.
Reference numeral 10 denotes a wiping blade made of a plate-shaped rubber-like elastic body. When the recording head 1 is at a predetermined position, the wiping blade 10 is rotated by a driving means (not shown) like a circular locus indicated by a chain double-dashed line. It is configured so that foreign matter such as ink droplets and paper dust attached to the ejection port surface 88 can be wiped off and removed. The recording mechanism including the recording head 1, the ink supply mechanism including the ink tank 3 and the like, the cleaning mechanism including the wiping blade 10, the capping unit 8 including the cap 9 and the like are configured by members that handle ink. Therefore, even if an ink leak occurs due to a breakage or the like, the frame member 11 is configured in a container shape so as not to damage the electric board or the like.
Are collectively covered by.

In FIG. 1, a guide member 12 is provided at a predetermined position on the peripheral surface of the platen roller 5.
The guide member 12 is provided at a position upstream of the recording head 1 in the recording material conveyance direction (a position slightly upstream), and the recording material 2 is provided.
Are arranged so as to contact the peripheral surface of the platen roller 5. In the ink jet recording apparatus according to the present embodiment, the recording material 2 is conveyed by the conveying means (platen roller) 5 on the upstream side of the recording means (recording head) 1 in the recording material conveyance direction.
The recording medium 1 having a guide member 12 that makes contact with the recording medium 1, moving means for retracting the recording means 1 in the direction away from the recording material 2, and control means for operating the conveying means 12 and the moving means. The rear end of 2 is the guide member 12
When it is pinched by the recording means 1
Is evacuated and the recording material 2 is conveyed.

FIGS. 3 to 6 are schematic side views showing the recording operation of the recording apparatus of FIG. 1, and FIG. 7 is a flow chart showing the operation of FIGS. 3 to 7, when a recording start signal is input, the recording material 2 is fed, and the recording material 2 is conveyed in the direction of arrow A by driving the platen roller 5 and the registration roller 6, and the recording material 2 is recorded. The front end of the material 2 is conveyed to the recording start position as shown in FIG. 3 (step S1). Almost at the same time, the recording head 1 is moved from a standby position (solid line position in FIG. 1) in a capping state to a recording position (position indicated by a chain double-dashed line in FIG. 1) by a drive motor and a link (not shown). Move (step S
2).

Since the wiping blade 10 rotates during the movement of the recording head 1 to wipe and clean the ejection opening surface 88, if ink droplets or the like adhere to the ejection opening surface 88, Will be removed. When the recording head 1 reaches the recording position, recording information is applied to the recording head 1 to start recording, and
The conveyance of the recording material 2 is started in synchronization with this (step S3).

When the recording is completed, as shown in FIG. 4, the conveyance of the recording material 2 is stopped while the rear end of the recording material 2 is still held by the paper guide 12 (step S4). Next, the recording head 1 is moved from the recording position to the retracted position shown in FIG. 5 (step S5) and stopped at this retracted position. The retracted position is set between the recording position shown by the solid line in FIG. 1 and the standby position (capping position) shown by the chain double-dashed line in FIG. When the recording head 1 is at the retracted position, the conveyance of the recording material 2 is restarted and the recording material 2 is ejected (step S6). Then, the recording head 1 is returned to the standby position (capping position) (step S7), and the recording operation is completed.

As described above, the conveyance of the recording material 2 is once stopped and the recording head 1 is retracted, and then the conveyance is restarted to eject the paper, so that the rear end of the recording material 2 is guided by the paper guide. At the moment when 12 is left, the bending tendency is released and the discharge surface 8
It is possible to eliminate the phenomenon of colliding with 8, so that
It is possible to eliminate problems such as ink adhering to the recording material 2 to cause stains, and the ejection port 89 being damaged to cause ejection failure.

In the above-described embodiment, when the recording head 1 is retracted from the recording position, the retracted position is set in advance, and the recording head 1 is stopped at that position.
In order to speed up the recording operation, the sheet discharging operation may be started without stopping the recording head, while observing the timing when the recording head retracts while moving. Further, when recording a plurality of sheets, the operation of the above-described embodiment may be repeated, but for example, between the pages, the retreat position without returning the recording head to the standby position (capping position). It is also possible to return to the recording position again and perform the recording of the next page. By doing so, the recording speed can be improved.

According to the above-described embodiment, in the ink jet recording apparatus having the full-multi type recording head 1, the conveyance of the recording material 2 is temporarily stopped and the recording head 1 is evacuated, and then the recording material 2 is retreated. Since the second recording medium 2 is configured to be discharged, it is possible to eliminate the phenomenon in which the trailing end of the recording material 2 is released at the moment when it leaves the paper guide 12 and collides with the ejection opening surface 88. By doing so, it is possible to eliminate inconveniences such as the recording material 2 being contaminated with the adhered ink and the ejection port 89 being damaged to damage the recording head, thereby improving the reliability of the recording apparatus and maintaining the quality of the recorded matter. be able to.

FIG. 8 is a schematic side view showing the overall construction of the recording section of an embodiment of the ink jet recording apparatus to which the invention of claim 4 is applied. In FIG. 8, reference numeral 21 is a recording material such as a recording paper or plastic sheet, 22 and 23 are paper feed rollers, 24 is a platen, and 25 are ejection openings arrayed over a length covering the entire width of the recording area of the recording material 21. Line type recording heads (recording means), 26 and 2
Reference numeral 7 is a paper discharge roller. The recording material 21 recorded by the recording head 25 is introduced into the fixing unit 28, and the fixing unit 2
After passing through 8, the paper is discharged from the paper discharge rollers 26 and 27 to the outside.

The recording head (recording means) 25 is an ink jet recording head for ejecting ink by utilizing heat energy, and is provided with an electrothermal converter for generating heat energy. Film boiling is generated in the ink by the applied thermal energy, and the pressure change due to the growth and contraction of bubbles generated at that time is used to eject the ink from the ejection port for recording. Therefore, the ink ejecting portion of the recording head 25 has
The ink ejection unit of the recording head 1 shown in FIG.

FIG. 9 shows the fixing unit 2 as seen from the line 9-9 in FIG.
8 is a transverse sectional view of FIG. That is, in FIG. 9, the recording material 21 is conveyed in the fixing unit 28 from the front to the back in the drawing. In the fixing unit 28 shown in FIGS. 8 and 9, 30 is a heater (heating element) for dry fixing that abuts the back surface of the recording material 21, 31 and 32 are left and right conveying rollers that convey the recording material 21, and 33. Is a transport shaft that penetrates the left and right transport rollers 31 and 32. In the present embodiment, the left and right transport rollers 29, 30 and the transport shaft 33 are arranged at a plurality of positions (3) at predetermined intervals in the transport direction as shown in FIG.
The transport mechanism at each position has substantially the same configuration as shown in FIG.

The cross-sectional shape of the heating surface (the surface contacting the back surface of the recording material 21) 40 of the heater (heating element) 30 for drying the ink (recording liquid) of the recording material 21 is shown in FIG. As shown in, the central portion is a so-called convex curved surface with a bulge. In FIG. 9, 34 is a pressing bearing that rotatably supports the conveying shaft 33, 35 is a spring that presses the pressing bearing 34, and 36 is a plunger for applying or releasing pressing force to the spring 35. Denoted at 37 are transport gears that are fixed to the transport shaft 33 and transmit a driving force to the transport shaft, 38 is a motor, and 39 is a timing belt that transmits the driving force from the motor 38 to the transport gear 37.

FIG. 10 is a partial sectional view schematically showing the structure and operation of the heating surface 40 of the heater 30, the transport roller 32 (31) and the transport shaft 33. In FIG. 10, the heating surface 40 of the heater 30 is formed of a material having a low coefficient of friction with the recording material 21. Then, in the present embodiment, FIG.
As shown in FIG. 5, there is play between the transport rollers 31 and 32 and the transport shaft 33, and since the heating surface 40 is inclined in the direction shown in the figure, the downward force P acts on the transport shaft 33. Then, as shown in the drawing, the points of the transport rollers 31 and 32 in contact with the recording material 21 are inclined outward.

Next, the operation of the embodiment described with reference to FIGS. 8 to 10 will be described. The recording material 2 is recorded by the recording head 25.
When recording is performed on the recording medium 1, the recording material 21 enters the fixing unit 28. The recording material 21 is conveyed in the fixing unit 28 by
This is performed by the left and right transport rollers 31 and 32 arranged in a plurality of stages. Since the left and right transport rollers 31 and 32 directly contact the recording surface of the recording material 21, those having high water repellency are desirable. When the recording material 21 comes into contact with the transport rollers 31 and 32, the plunger 36 operates and a force acts in a direction to compress the spring 35. Then, a downward force is applied to the conveying shaft 33 via the pressing bearing 34, and a force for pressing the recording material 21 against the surface 40 of the heater 30 acts on the conveying rollers 31 and 32.

Here, the heater 30 is made of a material having a low coefficient of friction with the recording material 21. Transport roller 31,
As shown in FIG. 10, there is play between the shaft 32 and the transport shaft 33, and the heating surface 40 of the heater 30 is inclined toward both ends so that the downward force P is reduced. When actuated, the transport rollers 31 and 32 tilt in a direction in which the point of contact with the recording material 21 is on the outside.

Further, the force applied by the transport rollers 31 and 32 to the recording material 21 at this time is Pcos θ / 2 in the direction of pressing the heater 30, as shown in FIG.
A force of Psin θ / 2 is applied in the direction of pulling 1. This is the same for each of the transport rollers 31 and 32 on both sides.
The force pressing the heater 30 against the heater 30 is P cos θ, and the pulling force is P sin θ. That is, since the recording material 21 is pulled toward both sides and pressed against the heater 30, the recording material 21 is evenly adhered and heated along the curved surface of the heating surface 40 of the heater 30.

When the recording material 21 is completely conveyed, the plunger 36 operates in a direction to release the load of the spring 35,
The pressing force of the transport rollers 31 and 32 is released. In this way, by simply providing a play between the shaft and the roller, the recording material 21
It is possible to easily realize a configuration capable of pressing the heater 30 against the heater 30 while pulling.

According to the embodiments described with reference to FIGS. 8 to 10 above, the shape of the heating surface 40 of the heater (heating element) 30 has a convex cross section such that the central portion in the sheet passing width direction is higher than both ends. Recording material 2 having a shape and conveyed through fixing section 28
Since the constitution is such that a force pulling 1 to both sides is applied, it becomes possible to apply heat from the heater 30 uniformly to the entire area of the recording material 21, and the following effects can be obtained.

Firstly, since the thermal efficiency of the heat fixing is improved, the power consumption can be reduced to reduce the running cost, and the fixing speed can be increased, which corresponds to the speeding up of the recording apparatus and the heating. By reducing the size of the surface 40, it is possible to reduce the size and weight of the recording apparatus.
Secondly, since the heat distribution in the width direction of the recording material 21 is equalized, it is possible to obtain the effect that the density unevenness of the recording due to the fixing is eliminated and the waviness (vertical wrinkles) of the recording material 21 is eliminated.

FIG. 11 is a schematic transverse sectional view showing a second embodiment of the fixing portion of the ink jet recording apparatus to which the invention of claim 4 is applied. In this embodiment, the transport rollers 31, 3 on both sides are
2 is formed of a rubber-like elastic body, and the conveying rollers 31 and 32 are fixed to the conveying shaft 33, so that these conveying rollers 3 can be formed.
The elasticity of 1 and 32 pulls the recording material 21 to both sides. In this regard, the present embodiment is shown in FIGS.
Although the second embodiment is different from the first embodiment, the other parts have substantially the same configuration as the first embodiment, the corresponding parts are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment shown in FIG. 11, the heater 30 of the elastic conveying rollers 31 and 32 and the recording material 21 are used.
It is more effective to form only the contact portion with a material having high wear resistance and water repellency. According to the second embodiment shown in FIG. 11, the same effect as in the case of the first embodiment can be obtained.

FIG. 12 is a schematic transverse sectional view showing a third embodiment of the fixing portion of the ink jet recording apparatus to which the invention of claim 4 is applied. In this embodiment, a shaft that can be elastically deformed is formed on the transport shaft 33, and by fixing the transport rollers 31 and 32 on both sides of the shaft, the recording material 21 is pulled to both sides by the elasticity of the transport shaft 33. Is configured. In this embodiment, in order to absorb the bending (elastic displacement) of the transport shaft 33, it is necessary to provide a play between the transport shaft 33 and the transport gear 37. The present embodiment is based on the above points in FIGS.
Although the second embodiment is different from the first embodiment, the other parts have substantially the same configuration as the first embodiment, the corresponding parts are denoted by the same reference numerals, and detailed description thereof will be omitted. With the configuration of the third embodiment, the same effect as that of the first embodiment described above can be obtained.

FIG. 13 is a schematic plan view showing a fourth embodiment of the fixing portion of the ink jet recording apparatus to which the invention of claim 4 is applied. In this embodiment, the conveying rollers 31, 3 on both sides are
2 is for the recording material 21 conveyed in the direction of arrow B,
The downstream side in the transport direction is arranged so as to be inclined in a direction that opens outward. Although this embodiment is different from the first embodiment in FIGS. 8 to 10 in this respect, the other portions have substantially the same configuration as the first embodiment, and corresponding portions are denoted by the same reference numerals, Detailed description thereof will be omitted.

With the configuration of the fourth embodiment shown in FIG. 13 as well, the conveying rollers 31 and 32 on both sides convey the recording material 21 while applying tension in a direction to spread the recording material 21 to both sides.
The same effect as that of the embodiment can be obtained. In the configuration of FIG. 13, the transport rollers 31 and 32 are connected to the recording material 21.
By touching the margins on both sides outside the image area of
It is desirable to avoid the possibility of disturbance in the recorded image.

FIG. 14 is a schematic plan view showing a fifth embodiment of the fixing portion of the ink jet recording apparatus to which the invention of claim 4 is applied. In this embodiment, the recording material 21 is connected to the heater 3
In a configuration in which the heating belt 40 of 0 is conveyed in the direction of the arrow B (sheet passing), the conveyor belts 4 are provided on both sides of the heater 30.
1, 42 are provided. One of the conveyor belts 41 is wound around the front and rear rollers 43 and 44, and the other conveyor belt 42 is wound around the front and rear rollers 45 and 46. Then, as shown in the drawing, the conveyor belts 41 and 42 on both sides are wider at the interval on the downstream side in the transport direction (the outlet of the recording material 21) than at the upstream side in the transport direction (the inlet of the recording material 21). Are arranged diagonally.

The fifth embodiment of FIG. 14 is the same as that of FIG.
Although different from the first embodiment of FIG. 10, the other parts have substantially the same configuration as the first embodiment, corresponding parts are denoted by the same reference numerals, and detailed description thereof will be omitted. In FIG. 14, when the friction coefficient between the left and right belts 41 and 42 and the recording material 21 is a certain value or more, the fixing unit 2
It is possible to apply a force to spread the recording material 21 conveyed through 8 outwards on both sides. Therefore, even with the configuration of the fifth embodiment of FIG.
Since the recording material 21 is conveyed while applying tension to the recording material 21 in the direction of spreading it to both sides, the same effect as in the case of the first embodiment described above can be obtained.

In the second embodiment of FIG. 11, the right side conveyor belt is stretched over the right and left elastic rollers 31 arranged in front and rear, and the left side conveyor belt is arranged in the left and right elastic rollers 32 arranged in front and rear. The recording material 21 may be stretched and conveyed by the left and right conveying belts. With such a constitution, the same effect as in the first embodiment can be obtained.

That is, according to each of the embodiments described above with reference to FIGS. 8 to 14, the shape of the heating surface 40 of the heater (heating element) 30 is higher at the central portion in the sheet passing width direction than at both ends. Since the recording material 21 conveyed through the fixing portion 28 is applied with a force that pulls the recording material 21 to both sides, the heat from the heater 30 is applied to the recording material 2.
It becomes possible to add evenly to the whole area of 1. for that reason,
First, since the thermal efficiency of heat fixing is improved, the power consumption can be reduced and the running cost can be reduced.
In addition, the fixing speed becomes faster, which corresponds to the speeding up of the recording apparatus, and the heating surface 40 can be made smaller to reduce the size and weight of the recording apparatus. Secondly, since the heat distribution in the width direction of the recording material 21 becomes equal, the recording density unevenness due to fixing is eliminated, and the recording material 2
The effect of eliminating the waviness (vertical wrinkle) of 1 is obtained.

FIG. 15 is a schematic sectional view showing the overall construction of an embodiment of a recording apparatus to which the invention of claim 13 is applied.
Note that FIG. 15 shows a case where the recording device is a facsimile device. In FIG. 15, a document reading unit L reads information written on a document, converts the information into an electric signal, and transmits the electric signal to a predetermined recording system. The recording means M is
An image is recorded on a conveyed recording material according to an image signal. Further, the recording material conveying means N conveys the recording material housed in the cassette or the recording material supplied from the manual insertion port to the recording means M, and discharges the recording material after recording.

In the document reading means L, a document placing table 51 is formed on the upper surface of the recording apparatus as shown in the figure, and the document 53 is stacked on the placing table 51 with the document surface facing down and guided by the side guides 52. Among them, the lowermost original 53 is pre-conveyed by the pre-conveying roller 54 and the pressure-contacting member 55 which is in pressure contact with the pre-conveying roller 54, and is separated one by one by the separating roller 56 and the pressure-contacting member 57 which is in pressure-contact with it.
The sheet is fed in the direction of arrow C (the left side of the apparatus main body). Then, the separated and fed original 53 is conveyed by the conveying roller 58 and the pinch roller 6 pressed against the conveying roller 58 by the spring 59.
Carried by 0.

By the pressing member 62 made of a white polyester film, which is pressed downward by the weight shaft 61,
When the original surface of the original 53 being conveyed is pressed by the reading glass 63 and passes through the glass 63, the image written on the original surface of the original 53 is read. In this reading, the light from a light emitting member (light emitting element) 64 such as an LED is applied to the document surface, and the reflected light from the document surface is reflected by the lens 6
By forming an image on the photoelectric conversion element 66 via 5,
This is performed by converting the image written on the original 53 into an electric signal.

In this embodiment, a contact type reading sensor in which the glass 63, the lens 65, the light emitting element 64, the photoelectric conversion element 66 and the like are integrated into a unit is used. The original 53 whose image has been read by these optical means is supplied to the discharge roller 67 and the spring 5
A document discharge tray 69 mounted on the left side surface of the apparatus main body in the figure by a pinch roller 68 pressed by 9
Is discharged to.

In the embodiment shown in FIG. 15, the recording means M of the recording apparatus (facsimile apparatus) is composed of a laser beam type recording apparatus. In the recording means M, a laser which charges the drum surface with a charger 71 arranged around the photosensitive drum 70 rotating in the direction of arrow D and oscillates a laser beam in accordance with an image signal from the reading means L. Light from the oscillator 72 is reflected by the polygon mirror 73 and is exposed on the rotating photosensitive drum 70 to form an electrostatic latent image, and the latent image is visualized by toner in the developing unit 74.

Then, the visible toner image is
It is transferred and recorded on a recording material (recording paper) 76 that has been conveyed between the photosensitive drum 70 and a transfer roller 75 that is in pressure contact with the photosensitive drum 70. The photosensitive drum 70 after the toner transfer is cleaned by the cleaning member 77. The photosensitive drum 70, the charger 71, the developing section 74, the cleaning member 77, etc. are housed in a recording cartridge 78. This recording cartridge 7
8 is detachably accommodated in the apparatus body.

Next, the recording material conveying means N of the recording apparatus (facsimile apparatus) shown in FIG. 15 will be described.
A cassette 90 for accommodating the recording material 76 is removably attached to the lower portion of the apparatus main body, and the cut sheet recording materials 76 are accommodated in the cassette 90 in a stacked state. At the time of paper feeding, a half-moon-shaped feeding roller 91 separates one uppermost layer of the recording material 76 stacked and accommodated, and feeds it as indicated by an arrow E. The fed recording material 76 is registered and conveyed by a pair of cassette conveying rollers 92 and 93 which are in pressure contact with each other, and is rotated by the conveying roller pair including a driving roller 94 and a pinch roller 95. It is transported in synchronization with. An image is transferred and recorded when the recording material 76 passes between the photosensitive drum 70 and the transfer roller 75.

The recording material 76 after recording is composed of a fixing roller 97 having a heater 96 built-in and a pressure roller 9 in pressure contact with the fixing roller 97.
Heat and pressure are applied when passing through the gaps 8 to fix the toner image (recorded image) on the recording surface of the recording material 76.
The recording material 76 recorded in this way is discharged onto the discharge roller 99,
The recording material is ejected onto the recording material ejection tray 102 by 101.

In the recording apparatus shown in FIG. 15, another manual feed port 103 as another recording material supply portion is formed on the left side surface of the apparatus main body. In this manual feed port 103,
A manual feed tray 104 that serves as a paper feed tray for recording material is attached. This manual feed tray 104 has a shaft 105.
15 is rotatably attached, and when used, the manual feed tray 104 is tilted down, a recording material is placed on the manual feed tray 104, and the manual feed tray 103 feeds the recording material. The recording material thus fed by hand is separated one by one by the separating member 106 which is in pressure contact with the driving roller 94, and is conveyed to the recording means M by the conveying roller pairs 94 and 95.

In the area of the recording means M, a thermal fixing section including the fixing roller 97 and the like is provided. Therefore, when a user mistakenly inserts a thermal paper as a recording material, there is a possibility that the recording surface becomes black and the recorded information becomes unreadable. Therefore, in this embodiment, in order to prevent such an accident, an abnormal recording detecting means is provided. The abnormal recording detecting means can be composed of, for example, a density detecting means for detecting the background color of the recording material.

In FIG. 15, the recording surface (paper surface) of the recording material 76 is irradiated with the light of the light emitting element on the downstream side of the fixing roller 97 and the pressure roller 98 in the recording material conveying direction, and from the recording surface. A density detecting unit (density sensor) 110 configured to detect the amount of reflected light of (1) by a light receiving element is provided. FIG. 16 is a partial perspective view showing the arrangement of the density detecting means 110. Concentration sensor (concentration detection means) 110
16 is arranged so that the density of the edge margin on one side of the recording material 76 (front side of the recording material 76 in FIG. 15) can be detected.

In FIG. 16, when a regular recording material is used, the edge margin is naturally white, and the density sensor 110 also detects white. On the other hand, when a thermal paper is mistakenly used as the recording material 76 and the recording material is heated by contacting the fixing roller 97, the entire recording surface is blackened. Therefore, the density sensor 110 also detects the edge margin of the recording material as black, and the output signal of the density sensor 110 changes.

Since the output signal of the density sensor 110 is monitored by the control section in a timely manner, when it is determined that the recording is abnormal due to a change in the output signal, an alarm sound is emitted, and in the normal case, the recording is not performed. When done,
The recording data to be erased is retained in the internal memory of the main body, and the operation of the entire recording device is suspended. The user can know the abnormality by this, and reinsert the regular recording material. Therefore, this time, the recording data held in the memory is normally recorded on the regular recording material. After that, the normal operation is restored. By adopting such a processing procedure, it is possible to prevent the accident of accepting an undeciphered recorded matter that is entirely blackened without being noticed as a normally received recorded matter.

According to the above-described embodiment, since the density detecting means 110 is provided in the recording apparatus having the heat fixing section, unintelligible recording is performed by the user mistakenly inserting the thermal paper. It is possible to prevent accidents.
This has a remarkable effect especially in a facsimile machine which often transmits and records data unattended. Therefore, it is possible to obtain a recording apparatus capable of preventing the accident as described above and greatly improving the reliability of the entire communication system.

In the embodiment of FIGS. 15 and 16, the density sensor 110 is provided on the downstream side of the thermal fixing section (fixing roller 97) in the recording material conveying direction. However, when a colored paper is used as the recording material 76, etc. Since there is a risk of false detection due to the background color, the same density sensor is also arranged on the upstream side in the recording material conveyance direction of the heat fixing section, and the disturbance of the recorded image is judged by the difference between the detection values of both density sensors. With such a configuration, it is possible to further increase the types of recording material 76 that can be used.

Further, in the above-mentioned embodiment, the density sensor 1
Although the density of the edge margin of the recording material 76 is detected by 10, the density sensor 110 may be a contact type image reading sensor, for example, to read the density if the margin is not desired. By comparing and referencing the data and the image signal input to the recording system, it is also possible to detect the abnormality of the entire blackening. in this case,
Not only the blackening of the entire surface due to the erroneous insertion of the thermal paper but also the abnormality detection when the recording is not normally performed due to some trouble of the recording unit can be simultaneously performed.

The embodiment described with reference to FIGS. 15 and 16 can also be applied to detect abnormalities and prevent accidents when plain paper is erroneously inserted into a recording device (facsimile device or the like) that should use thermal paper. Is. If plain paper is inserted incorrectly, the entire recording surface will be white and not recorded at all.Therefore, for example, only a part of black should be recorded in the header part that displays the destination, and the presence of that black part is dark. The abnormality can be detected depending on whether or not it is detected by the sensor 110.

In the embodiment described with reference to FIGS. 15 and 16, the laser beam recording system, which is one of the electrophotographic recording systems having the heating and fixing section, has been described. The structure for accident prevention is L
The same can be applied to a recording apparatus having another electrophotographic recording system using an ED array, a liquid crystal shutter array, or the like, and the same operational effect can be obtained. The same can be applied to the recording apparatus described above and the same effect can be obtained.

The above-described structure for detecting the erroneous insertion of the recording material and preventing accidents may be a wire dot type, a thermal type, a thermal transfer type, an ink jet type or the like as long as it is a recording apparatus having a heat fixing unit. The present invention can be similarly applied to the recording apparatus of the recording method, and the same effect can be obtained. That is, the invention can be similarly applied to an ink jet recording apparatus provided with a fixing device for drying and fixing ink, and the same effects as those in the cases of FIGS. 15 and 16 can be obtained. However, in the case of an inkjet recording device, a heating and fixing device is not necessarily required if the recording is performed at a low speed. Therefore, when the thermal paper is detected by the density sensor, heating by the fixing device is stopped and the recording material is conveyed at a low speed. By re-recording with the saved data,
Without interrupting the operation of the apparatus main body, it is possible to detect erroneous insertion of the recording material and take measures for accident prevention.

In each of the above-described embodiments, the case of the line recording system in which the recording is performed only in the sub-scanning by using the line recording means having the length that covers the entire width or a part of the recording material has been described. However, the present invention can be similarly applied to the serial recording method in which the recording unit is moved in the main scanning direction or the drum scan method in which the recording material wound around the rotating drum is used for recording. The same action and effect can be obtained.

In each of the above-described embodiments, the case of single-color recording in which recording is performed by one recording means has been described as an example. However, the present invention is not limited to color recording using a plurality of recording means for recording in different colors. In the case, or gradation recording using a plurality of recording means for recording with the same color and different densities, it can be widely applied regardless of the number of recording means and recording colors, and similar effects can be obtained in those cases as well. It is a thing.

Further, according to the present invention, when a head cartridge in which the recording means and the ink tank are integrated is used, the recording means and the ink tank are separately provided in addition to the replaceable or ink filling type (permanent type) head cartridge,
Even if the recording means and the ink tank are connected to each other by any means such as an ink supply tube, they can be similarly applied and the same effect can be achieved.

The present invention can be applied to an ink jet recording apparatus using a recording means (recording head) using an electromechanical transducer such as a piezo element, but among others, thermal energy is used. The present invention brings excellent effects in an ink jet recording apparatus that uses a recording means of a type that ejects ink. This is because such a system can achieve high density recording and high definition recording.

Regarding its typical structure and principle, see, for example, US Pat. Nos. 4,723,129 and 4740.
This is preferably done using the basic principles disclosed in 796. This method can be applied to both the so-called on-demand type and the continuous type, but particularly in the case of the on-demand type, a liquid (ink) is used.
By applying at least one drive signal to the electrothermal converter arranged corresponding to the sheet or liquid path in which is stored, which corresponds to the recorded information and causes a rapid temperature rise exceeding nucleate boiling. , Generates heat energy in the electrothermal converter to cause film boiling on the heat acting surface of the recording means (recording head), and as a result, bubbles can be formed in the liquid (ink) in a one-to-one correspondence with this drive signal. So effective.

Due to the growth and contraction of the bubbles, the liquid (ink) is ejected through the ejection opening to form at least one droplet. It is more preferable to make the driving signal into a pulse shape because bubbles can be grown and contracted immediately and appropriately, and thus a liquid (ink) with excellent responsiveness can be ejected. As this pulse-shaped drive signal, US Pat.
Those described in US Pat. Nos. 4,633,359 and 4,345,262 are suitable. Incidentally, US Pat. No. 43131 of the invention relating to the rate of temperature rise of the heat acting surface.
If the conditions described in the specification of No. 24 are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the linear liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. US Pat. No. 4,558,333, US Pat. No. 4,558,333, which discloses a configuration in which a heat acting portion is arranged in a bending region.
A configuration using the specification of No. 459600 is also included in the present invention. In addition, Japanese Laid-Open Patent Publication No. 123670/1984 discloses a configuration in which a common slit is used as a discharge portion of the electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy. The present invention is also effective as a structure based on Japanese Patent Laid-Open No. 138461/1984, which discloses a structure in which the discharge section is associated with the discharge section. That is, according to the present invention, recording can be reliably and efficiently performed regardless of the form of the recording head.

Further, as described above, the present invention can be effectively applied to a full line type recording head having a length corresponding to the maximum width of a recording material (recording medium) which can be recorded by the recording apparatus. . As such a recording head,
Either a structure that satisfies the length by combining a plurality of recording heads or a structure as one recording head integrally formed may be used. In addition, even with the serial type as in the above example, the recording head fixed to the device main body,
Alternatively, a replaceable chip-type recording head that can be electrically connected to the device body and supply ink from the device body when mounted on the device body, or an ink tank is integrally provided on the recording head itself. The present invention is also effective when the cartridge type recording head described above is used.

Further, it is preferable to add recovery means, preliminary auxiliary means, etc. to the recording head provided as a constitution of the recording apparatus in the present invention because the effect of the present invention can be further stabilized. If you list these specifically,
Capping means, cleaning means, pressurizing or suctioning means, electrothermal converter or other heating element or preheating means by a combination thereof, and ejection different from recording are applied to the recording head. Performing the preliminary ejection mode is also effective for stable recording.

As described above, regarding the type and number of recording heads mounted, for example, only one is provided corresponding to a single color ink, or a plurality of recording heads having different recording colors and densities are provided. A plurality of inks may be provided corresponding to the ink. That is, for example, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but may be either the recording head is integrally configured or a combination of a plurality of recording heads may be used. The present invention is extremely effective for an apparatus provided with at least one of color colors or full colors by color mixing.

In addition, in the above-described embodiments of the present invention, the ink is described as a liquid, but it is an ink that solidifies at room temperature or lower and that softens or liquefies at room temperature, or an ink jet. In the method, the temperature of the ink itself is generally adjusted within a range of 30 ° C. or higher and 70 ° C. or lower to control the temperature of the ink so that the viscosity of the ink is within a stable ejection range. It may be in a liquid form. in addition,
Whether the temperature rise due to thermal energy is positively used as the energy for changing the state of the ink from the solid state to the liquid state, or the ink that solidifies when left standing for the purpose of preventing evaporation of the ink is used. In any case, the ink is liquefied by applying the thermal energy according to the recording signal and the liquid ink is ejected,
The present invention is also applicable to the case of using an ink that has a property of being liquefied only by thermal energy, such as one that has already started to solidify when it reaches the recording medium.

The ink in such a case is described in JP-A-54-
As described in JP-A-56847 or JP-A-60-71260, a form in which the electrothermal converter is opposed to a liquid sheet or a solid material held in the recesses or through holes of the porous sheet. May be 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, as the form of the ink jet recording apparatus according to the present invention, in addition to the one used as an image output terminal of information processing equipment such as a computer, a copying apparatus combined with a reader or the like, and a facsimile apparatus having a transmitting / receiving function. And the like may be used.

[0089]

As is clear from the above description, according to the first aspect of the invention, in the ink jet recording apparatus for recording by ejecting the ink from the recording means to the recording material, it is upstream of the recording means in the conveying direction. A guide member for bringing the recording material into contact with the conveying means; a moving means for retracting the recording means in a direction away from the recording material; and a control means for operating the conveying means and the moving means. When the trailing edge of the recording material is sandwiched by the guide member, the recording means is retracted by the moving means to convey the recording material, so that the collision between the recording means and the recording material is ensured. The present invention provides an ink jet recording apparatus that can prevent the ink stain on the recording material and the damage to the ejection port, and can improve the reliability of the recording apparatus and maintain the quality of the recorded matter. It is.

According to the invention of claim 4, in the ink jet recording apparatus for recording by ejecting ink from the recording means to the recording material, the heating means is provided on the downstream side of the recording position in the recording material conveying direction, and the heating is performed. Inside the means, a heating element having a curved surface in which a central portion in a direction perpendicular to the recording material conveyance direction is higher than both ends and a convex shape, and at least two points of the recording material are brought into contact and the recording material is conveyed. The recording medium is configured to convey the recording material by applying tension to the outer surface of the recording material while pressing the back surface of the recording material against the heating element. (EN) An ink jet recording apparatus that can be uniformly pressed to improve heat transfer efficiency, can increase fixing speed, and can prevent uneven density and waviness of a recording material due to fixing.

According to the invention of claims 5 to 10, in addition to the above construction, the coefficient of friction between the recording material and the heating element is μ ₁ , and the coefficient of friction between the recording material and the conveying means is μ ₁ . _{When 2} , the heating means is configured such that μ ₁ <μ ₂ ,
The transport means is configured by loosely fitting a disk-shaped circular member around a shaft, the shaft or the circular member is an elastic body, and the shaft is provided when a recording material comes into contact with the transport means. The pressing force acts on the central part of the recording medium, and the pressing force is released when the recording medium is separated.When the conveying means is in contact with both ends of the recording material, the distance between the contact points is the pressing force acting on the shaft. A configuration that is larger when it is working than when it is not working,
Alternatively, since the transport means is a belt,
Even more efficiently, the recording material can be pressed evenly against the heating element to improve the heat transfer efficiency, the fixing speed can be increased, and the uneven density and the waviness of the recording material due to the fixing can be prevented. An inkjet recording device capable of performing the above is provided.

According to the thirteenth aspect of the invention, the recording is provided with the paper feeding means for supplying the recording material, the conveying means for conveying the recording material, the recording means for recording on the recording material, and the heat fixing means. In the apparatus, since the density detecting means for detecting the background color of the recording material is provided on the downstream side or both the upstream side and the downstream side of the recording means in the conveying direction, the user mistakenly removes the thermal paper. It is possible to effectively prevent accidents where unintelligible recording is made due to insertion, especially in facsimile machines where unmanned data transmission and recording are often performed. At the same time, a recording device is provided that can greatly contribute to the improvement of the reliability of the entire communication system.

According to the inventions of claims 14 to 20,
In addition to the above configuration, the recording unit is an electrophotographic system having a heat fixing unit, the recording unit is an inkjet recording system having a heat fixing unit, and a density detection is performed on a part of a recording material for density detection. Configuration to record patterns,
The density detecting means detects a recording blank portion of a recording material, the density detecting means is an optical detecting means including a light emitting element and a light receiving element, and the density detecting means conveys a heat fixing means. A configuration in which the background color of the recording material is detected by the difference between the detection value on the upstream side in the direction and the detection value on the downstream side in the transport direction,
Alternatively, since the warning means is actuated by the detection value of the density detecting means, it is possible to more efficiently prevent an accident in which the user mistakenly inserts the thermal paper to cause unreadable recording. There is provided a recording device that can contribute to the improvement of reliability of the entire communication system.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a configuration of a recording unit of an embodiment of an inkjet recording apparatus to which the invention of claim 1 is applied.

FIG. 2 is a partially cutaway perspective view schematically showing the structure of an ink ejection portion of the recording means in FIG.

FIG. 3 is a partial side view schematically showing the state of the recording apparatus of FIG. 1 at the start of recording.

FIG. 4 is a partial side view schematically showing the state of the recording apparatus of FIG. 1 at the end of recording.

5 is a partial side view schematically showing a state when the recording apparatus of FIG. 1 finishes recording and retracts the recording means. FIG.

FIG. 6 is a partial side view schematically showing a state in which the recording material is ejected after the recording apparatus of FIG. 1 finishes recording and retracts the recording means.

FIG. 7 is a flowchart showing a sequence of each operation shown in FIGS.

FIG. 8 is a schematic side view showing a main part configuration of an embodiment of an ink jet recording apparatus to which the invention of claim 4 is applied.

9 is a schematic cross-sectional view of the fixing unit according to the first embodiment taken along the line 9-9 in FIG.

FIG. 10 is a schematic partial cross-sectional view showing the direction and magnitude of the force applied by the transport roller to the recording material in the fixing section of FIG.

FIG. 11 is a schematic cross-sectional view of a second embodiment of the fixing unit of the ink jet recording apparatus to which the invention of claim 4 is applied.

FIG. 12 is a schematic cross-sectional view of a third embodiment of the fixing unit of the ink jet recording apparatus to which the invention of claim 4 is applied.

FIG. 13 is a schematic cross-sectional view of a fourth embodiment of the fixing unit of the ink jet recording apparatus to which the invention of claim 4 is applied.

FIG. 14 is a schematic cross-sectional view of a fifth embodiment of the fixing unit of the ink jet recording apparatus to which the invention of claim 4 is applied.

FIG. 15 is a schematic vertical sectional view showing the configuration of an embodiment of a recording apparatus to which the invention of claim 13 is applied.

16 is a partial perspective view showing an arrangement example of the concentration detecting means in FIG.

[Explanation of symbols]

 1 recording means (recording head) 2 recording material 3 ink tank 4 ink 5 platen roller 8 capping means 9 cap 10 wiping blade 12 guide member 21 recording material 24 platen 25 recording means (recording head) 26 paper ejection roller 27 paper ejection Roller 28 Fixing unit 30 Heating element (heater) 31 Transport roller 32 Transport roller 33 Transport shaft 34 Pressing bearing 35 Spring 36 Plunger 37 Transport gear 38 Motor 40 Heating surface (heater surface) 41 Transport belt 42 Transport belt 51 Document placement table 53 Document 58 Conveying Roller 63 Reading Glass 64 Light Emitting Member 66 Photoelectric Conversion Element 67 Ejecting Roller 69 Document Ejecting Tray 70 Photosensitive Drum 71 Charging Device 72 Laser Oscillator 74 Developing Section 75 Transfer Roller 76 Recording Material 77 Cleaning Member 78 Recording cartridge 81 Substrate 82 Electrothermal converter 86 Liquid path 87 Common liquid chamber 88 Discharge port surface 89 Discharge port 90 Paper feed cassette 91 Paper feed roller 96 Heater 97 Fixing roller 98 Pressure roller 99 Discharge roller 101 Discharge roller 102 Recording material Discharge tray 110 Density detection means (density sensor) L Document reading means M Recording means N Recording material conveying means

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Norio Kajiwara 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (23)

[Claims] 1. In an inkjet recording apparatus for recording by ejecting ink from a recording means to a recording material, a guide member for contacting the recording material with the conveying means on the upstream side of the recording means in the conveying direction, and the recording means. When the rear end of the recording material is clamped by the guide member, the recording medium has a moving means for retracting in a direction away from the recording material, and a control means for operating the conveying means and the moving means. An ink jet recording apparatus, wherein the recording means is retracted by the moving means and the recording material is conveyed. 2. The ink jet recording apparatus according to claim 1, wherein the recording means is an ink jet recording means provided with an electrothermal converter that generates thermal energy used for ejecting ink. 3. The ink jet recording apparatus according to claim 2, wherein the recording unit ejects the ink from the ejection port by utilizing film boiling generated in the ink by the thermal energy generated by the electrothermal converter. . 4. An inkjet recording apparatus for recording by ejecting ink from a recording means to a recording material, wherein a heating means is provided on the downstream side of the recording position in the recording material conveying direction, and the recording means is provided inside the heating means. A heating element having a curved surface having a convex shape whose central portion in a direction perpendicular to the material conveying direction is higher than both end portions, and conveying means for contacting at least two points of the recording material to convey the recording material, An inkjet recording apparatus, wherein the conveying unit presses the back surface of the recording material against the heating element and applies tension to the recording material in an outward direction at right angles to the conveying direction. 5. When the friction coefficient between the recording material and the heating element is μ ₁ and the friction coefficient between the recording material and the conveying means is μ ₂ , the heating means satisfies μ ₁ <μ _2. The ink jet recording apparatus according to claim 4, wherein the ink jet recording apparatus is configured as follows. 6. The ink jet recording apparatus according to claim 4, wherein said conveying means is a disk-shaped circular member loosely fitted on a shaft. 7. The ink jet recording apparatus according to claim 6, wherein the shaft or the circular member is an elastic body. 8. The ink jet recording apparatus according to claim 6, wherein a pressing force acts on the central portion of the shaft when the recording material comes into contact with the conveying means, and the pressing force is released when the recording material is separated. 9. When the conveying means is in contact with both ends of the recording material, the distance between the contact points is larger when the pressing force is acting on the shaft than when it is not acting. The inkjet recording device according to claim 6, wherein 10. The ink jet recording apparatus according to claim 4, wherein the conveying means is a belt. 11. The inkjet recording apparatus according to claim 4, wherein the recording unit is an inkjet recording unit including an electrothermal converter that generates thermal energy used to eject ink. 12. The ink jet recording apparatus according to claim 11, wherein the recording unit ejects the ink from the ejection port by utilizing film boiling generated in the ink by the thermal energy generated by the electrothermal converter. . 13. A recording device comprising a paper feeding means for supplying a recording material, a conveying means for conveying the recording material, a recording means for recording on the recording material, and a heat fixing means, in which the recording means is conveyed. A recording apparatus, characterized in that density detecting means for detecting the background color of the recording material is provided on the downstream side or both the upstream side and the downstream side in the direction. 14. The recording apparatus according to claim 13, wherein the recording means is an electrophotographic system having a heat fixing means. 15. The inkjet recording system according to claim 1, wherein the recording unit has a heat fixing unit.
Recording device of 3. 16. The recording apparatus according to claim 13, wherein a density detection pattern is recorded on a part of the recording material for density detection. 17. The recording apparatus according to claim 13, wherein the density detecting unit detects a recording margin portion of the recording material. 18. The recording apparatus according to claim 13, wherein the density detecting unit is an optical detecting unit including a light emitting element and a light receiving element. 19. The background color of the recording material is detected by a difference between a detection value on the upstream side in the transport direction and a detection value on the downstream side in the transport direction of the thermal fixing means. 13 recording devices. 20. According to the detection value of the density detecting means,
14. The recording device according to claim 13, wherein the warning means is activated. 21. The recording apparatus according to claim 13, wherein the recording means is an inkjet recording means. 22. The recording apparatus according to claim 13, wherein the recording unit is an ink jet recording unit including an electrothermal converter that generates thermal energy used for ejecting ink. 23. The recording apparatus according to claim 22, wherein the recording unit ejects the ink from the ejection port by utilizing film boiling generated in the ink by the thermal energy generated by the electrothermal converter.