JP2003072174A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of an apparatus by preventing a recording head from breaking through collision against an edge of a floating prevention member for a recording medium even when the recording medium having an unexpected thickness is transferred or when many sheets of recording media are transferred overlapping. SOLUTION: Projecting parts 113a and 113b are set to a face at the side of the recording head 101 of the paper floating prevention member 113 which restricts floating of side end parts of a recording paper 401. When the recording paper having a predetermined or larger thickness or a paper bundle of a plurality of sheets is transferred between a platen 111 and a move region of the recording head 101, even if the recording head 101 moves over the paper floating prevention member 113, the projecting parts 113a and 113b slide with a guide part 101a except a nozzle part 101b of the recording head 101 while elastically deforming the paper floating prevention member 113 to prevent hitting between the nozzle part 101b of the recording head 101 and an end part (edge) 113c at the free end side of the paper floating prevention member 113.

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 an image on a recording medium while intermittently conveying the recording medium.

[0002]

2. Description of the Related Art A recording device having functions of a printer, a copying machine, a facsimile, etc., or a recording device used as an output device of a composite type electronic device including a computer, a word processor, etc. An image is recorded on a recording medium (recording material) such as a plastic thin plate. Such a recording apparatus is an inkjet type according to a recording method,
It can be classified into a wire dot type, a thermal type, a laser beam type and the like.

In a serial type recording apparatus which employs a serial scan system in which main scanning is performed in a direction intersecting a conveying direction (sub-scanning direction) of a recording medium, an image is recorded by a recording means mounted on a carriage that moves along the recording medium. Is recorded (main scanning), and after the recording of one line is completed, a predetermined amount of paper feed (pitch conveyance) is repeated, and the entire recording medium is recorded. on the other hand,
In a line type printing apparatus that prints only by sub-scanning in the conveyance direction of the print medium, the print medium is set at a predetermined print position, one line of print is performed at a time, and then a predetermined amount of paper feed ( Pitch feed), and by repeating the operation of collectively recording the next line,
Recording of the entire recording medium is performed.

Among the above-mentioned recording apparatuses, the serial type ink jet recording apparatus is one which performs recording by ejecting ink onto a recording medium while moving the recording means (recording head), and the recording means can be easily made compact. Yes, high-definition images can be recorded at high speed, can be recorded on plain paper without any special processing, low running cost, low noise due to non-impact method, and multi-color ink It is easy to record a color image by using the.

In the serial type ink jet recording apparatus, the recording medium is conveyed by an optimum amount while being nipped (sandwiched) by the conveyance roller and the pinch roller, and the recording head arranged at a predetermined distance from the recording medium is moved. Meanwhile, ink is ejected from the recording head to form an image. On the other hand, when the quality of the recorded image is required to be high, the distance between the recording head and the recording medium is required to be as narrow as possible. The purpose of this is to reduce the amount of displacement of the landing position by shortening the distance to the landing of ink droplets ejected from the recording head that are displaced from the target position.

However, when the distance between the recording head and the recording medium is narrowed, the behavior of the recording medium becomes unstable and the recording medium collides with the recording head, and the ink adhering to the surface of the recording head is discharged. However, the image quality may be deteriorated by the transfer to the recording medium, or the moving recording head and carriage may catch the recording medium and damage the recording medium. When the recording head collides with the recording medium as described above, in the worst case, the recording head colliding with the recording medium may be damaged and the normal image recording may not be guaranteed.

In particular, both ends of the recording medium in the direction intersecting the recording medium conveying direction are easily lifted, and there is a high possibility of collision with the recording head moving in the direction intersecting the recording medium conveying direction. Further, the recording medium is constrained and conveyed by a pinch roller corresponding to a conveying roller located upstream of the recording head in the recording medium conveying direction and a spur corresponding to a discharge roller located downstream of the recording head in the recording medium conveying direction. The behavior of the recording medium is relatively stable during the interval, but it is difficult to hold down the edge of the recording medium in the transport direction during recording at the leading edge and the trailing edge in the transport direction. Due to the configuration of the device, the risk of collision increases.

Under these circumstances, various measures have been taken in the conventional recording apparatus.

For example, irrespective of the type of recording medium, in a recording apparatus that conveys the recording medium with one side end of both ends of the recording medium in the direction intersecting the recording medium conveying direction as a reference, In the range that does not cover the recording area,
A plate-shaped member is provided to prevent the end of the recording medium from floating in the direction intersecting the recording medium conveyance direction, and measures are taken to prevent the recording medium on the recording medium reference side from colliding with the recording head.

[0010]

However, the floating prevention member for a recording medium shown in the above-mentioned conventional example needs to be supported in a cantilever manner in order for the recording medium to pass under the lower surface of the floating prevention member. When the sheet passes, the sheet is elastically deformed upward (on the side closer to the recording head). Further, when the recording medium passes the lower surface of the floating prevention member, the end surface (edge portion) of the floating prevention member on the free end side is displaced upward (toward the recording head) by more than the thickness of the recording medium.

Therefore, a member provided to prevent the end portion of the recording medium from colliding with the recording head may collide with the recording head in some cases and destroy the recording head. I will end up. In particular, when a recording medium with an unexpected thickness is used, or when multiple feeds occur due to a defect in the recording medium supply system, the edge of the floating prevention member on the free end side collides with the recording head. More likely to.

The present invention has been made in view of the above-mentioned problems of the prior art, and prevents the recording medium from floating even when a recording medium having an unexpected thickness is conveyed or a large number of double feeds occur. SUMMARY OF THE INVENTION An object of the present invention is to provide a recording apparatus provided with a unit capable of improving the reliability of the apparatus without the edge of the recording medium colliding with the recording head and damaging the recording head.

[0013]

In order to achieve the above object, the present invention provides a recording medium conveying means for conveying a recording medium,
In a recording apparatus having a unit for moving a recording head in a direction intersecting the recording medium conveyance direction, a recording medium in a direction intersecting the recording medium conveyance direction between a conveyance surface of the recording medium and a moving region of the recording head. The present invention is characterized in that a floating prevention member for a recording medium having an area covering an end portion is provided, and a convex portion is provided on a surface of the floating prevention member on the recording head side.

In the above recording apparatus, the floating prevention member is supported in a cantilever manner, and the recording medium is prevented from floating by the side surface opposite to the convex portion on the free end side. And
It is preferable that the convex portion of the floating prevention member is located at a position that does not substantially coincide with a portion of the recording head relating to recording in the recording medium conveyance direction.

With the above arrangement, when the recording medium having a predetermined thickness or more or a plurality of bundles are conveyed between the conveying surface of the recording medium and the moving area of the recording head, the recording head floats on the recording medium. Even if the recording medium is moved on the prevention member, the convex portion prevents the recording medium floating prevention member from contacting the portion of the recording head that is substantially related to recording and the free end side edge of the recording medium floating prevention member. While being elastically deformed, it slides on a portion of the recording head other than the portion related to recording. Therefore,
Even when a recording medium such as a thick paper is conveyed or a plurality of sheets are overlapped, the recording head and the edge of the floating prevention member of the recording medium do not collide with each other and the recording head is not destroyed.
The reliability of the device can be improved.

In the moving direction of the recording head, the distance from the fixed end of the floating prevention member to the end on the free end side is L1, and the distance from the fixed end of the floating prevention member to the center of the convex portion. L2, the projection amount of the convex portion of the anti-floating member is h1, and the displacement amount of the free end side end portion of the anti-floating member is h2 when a recording medium having the maximum passable thickness passes. ,

[0017]

## EQU1 ## h2 <L2 × sin {sin ^-1 (h2 / L
It is preferable to set the protrusion amount h1 of the convex portion of the floating prevention member so that the relationship of 1)} + h1 is established.

The present invention is also suitable for a recording apparatus having a recording head of the ink jet type.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In this embodiment, a serial type ink jet printer equipped with a removable recording head with an ink tank will be described as an example.

FIG. 1 is an overall perspective view of a serial type ink jet printer which is a first embodiment of the present invention. In the figure, a recording head 1 having a plurality of ink tanks
01 is detachably mounted on the carriage 102.
A guide shaft 103 is inserted in a bearing portion of the carriage 102 so as to be slidable in the main scanning direction, and both ends of the shaft are fixed to a chassis 116. The drive of a drive motor 105, which is a carriage drive unit, is transmitted via a belt 104, which is a carriage drive transmission unit, that is engaged with the carriage 102, and the carriage 102 moves in a direction (main scanning direction) that intersects the recording sheet conveyance direction. Can be moved. Here, a recording sheet will be described as an example of the recording medium, but the present invention is not limited to this, and any sheet other than a sheet can be applied.

During the recording standby, the recording sheets are stacked (stacked) on the sheet feeding base 106, and the recording sheet is fed by the sheet feeding roller 201 at the start of recording. The fed recording paper is conveyed by a conveyance roller 108 driven by a paper conveyance motor 107 and a pinch roller spring 110.
It is sandwiched between the pinch roller 109 which is pressed by the transport roller 108 and is driven to rotate by the transport roller 108, and is transported by the transport roller 108 by an appropriate feed amount. Therefore, the carriage 10
During the movement of 2, the ink is ejected from the recording head 101 toward the recording sheet pressed against the platen 111 to form an image on the recording sheet. After the image formation is completed, the recording paper is ejected by the paper ejecting means, and the recording operation is completed. In this embodiment, the front surface of the platen 111 is a surface (conveying surface) that directly supports the back surface of the recording paper. However, if a plurality of ribs are formed to support the back surface of the recording paper, the rib recording is performed. A virtual surface formed by a portion that supports the back surface of the paper serves as a transport surface of the recording paper.

Here, the stack of sheets on the sheet feeding base 106 is set with reference to the right end 106-1 shown in FIG. Therefore, even when recording sheets having different widths are fed, the position of the right side edge of the sheet does not change. Reference numeral 112 denotes an elastic member (paper floating prevention member) that suppresses floating of the right end of the paper being conveyed, and the paper floating prevention member 112 is attached to the platen 111. This is the recording paper 4 in the paper width direction (direction orthogonal to the paper transport direction).
The recording paper 4 is located at a position (overlapping) of the right end portion of the recording paper 4 outside the recording area, and the recording paper 4
01 above the transport surface and below the moving area of the recording head 101. Further, since it becomes difficult to hold down the end portion of the recording sheet in the conveyance direction at the time of recording the leading end and the trailing end of the recording sheet in the conveyance direction, the sheet floating prevention member 112 is spun from the vicinity of the pinch roller 109 (to the discharge roller). It is provided up to the vicinity of the driven rotating body 403. Since the position of the right edge of the sheet does not change, it is possible to reliably suppress the floating of the right edge of the sheet of any width. By arranging the sheet floating prevention member in a portion outside the recording area of the sheet, the recorded image is recorded on the sheet floating prevention member 11
It prevents the image from being deteriorated due to contact with 2. It should be noted that the “recording area” refers to an area (hereinafter, referred to as a recording area) in which recording is performed by ejecting ink from the nozzle portion of the recording head 101 in accordance with the movement of the recording head 101 in the direction intersecting with the sheet conveyance direction. The "outside the recording area" means an area where the ink is not ejected and is not recorded.

Further, reference numeral 113 in FIG. 3 denotes an elastic member (sheet floating prevention member) for suppressing the floating of the left side edge (non-reference side edge of the sheet) which is a feature of the present invention. Reference numeral 113 denotes at least a moving area of the recording head 101 and a conveyance surface of the recording sheet 401 (here, the platen 111
3 is located in the same manner as the sheet floating prevention member 112 that suppresses the floating of the right side edge of the sheet (reference side edge of the sheet), as shown in FIG.

The floating prevention member 113 at the non-reference side edge of the paper
Is a fixed type according to the maximum width (for example, A4 size) of the recording medium that is supposed to be conveyed in the apparatus of the present embodiment, but the size of the paper set on the paper feed base 106 (for example, B5, postcard size, etc.) The position may be changed according to the above, and even if the position is changed in this way, the portion (overlap area) of the floating prevention member 113 that covers the non-reference end side of the sheet is designed to be the same. It's even better to have

As described above, in this embodiment, the floating prevention member for the recording medium is provided corresponding to both the paper reference side edge and the paper non-reference side edge. It may be fixed corresponding to only.

FIG. 4 shows the structure in the vicinity of the sheet floating prevention member 113 for suppressing the floating of the non-reference side edge of the sheet 401.

In FIG. 4, the recording paper 401 conveyed by the pinch roller 109 and the conveying roller 108 has a spur 403 and a discharge roller 404 on the downstream side in the conveying direction N.
Being restrained by. The sheet floating prevention member 113 has an upper surface (a surface close to the head) on which the convex portion 1 on the upstream side in the transport direction is provided.
13a and a convex portion 113b on the downstream side in the transport direction are provided. These convex portions 113a and 113b are arranged in the sheet conveyance direction N.
Regarding the recording head 101, it is arranged at a position avoiding the nozzle portion 101-1 which is a portion substantially related to recording of the recording head 101. Reference numeral 402 indicates a recording area.

Next, the state when the sheet is conveyed will be described with reference to FIGS. 5 and 6.

FIG. 5 is a view of the printer of this embodiment as seen from the paper discharge side, in which the recording paper 401 is the platen 111.
It is on the upper side and is being conveyed between the recording sheet conveyance surface of the platen 111 and the sheet floating prevention member 113. Since the recording paper 401 shown in this figure has a normal thickness, no load is applied to the paper floating prevention member 113 and elastic deformation does not occur. In addition, the sheet floating prevention member 11 is normally used.
3 and the recording head 101 are prevented from contacting each other, the convex portions 11 on the upstream and downstream sides of the sheet floating prevention member 113 in the sheet conveying direction.
The protrusion amount h1 of 3a and 113b is determined by the sheet floating prevention member 11
It is set to be smaller than the distance d between the flat surface portion of No. 3 and the surface (nozzle formation surface) of the recording head 101 facing this.

A guide portion 101a is provided as a peripheral portion of the nozzle portion 101b in a portion of the recording head 101 facing the recording medium conveying surface. Guide section 101
It is preferable that a has a surface that is the same height as or higher than the nozzle surface (ejection surface), and has a slope (tapered shape) 101c at least in a portion of the guide portion 101b that intersects the paper transport direction. It is preferable.

6A to 6C are views seen from the same direction as FIG. 5, but a double feed occurs due to a paper feed failure, and the recording sheet 401 is placed between the recording head 101 and the platen 111. Shows that a large number of sheets have been sent. During normal conveyance, the sheet floating prevention member 113 is provided with the convex portions 113a, 113 on the free end side.
Although the recording sheet 401 is prevented from floating by the side opposite to b, the sheet floating prevention member 113 is elastically deformed in the direction in which the free end side approaches the recording head 101 as shown in FIG. In particular, the free end side edge 113c of the sheet floating prevention member 113 is the most recording head 101.
Approach. When the displacement e at this time is larger than d in FIG. 5, the recording head 101 and the sheet floating prevention member 113 come into contact with each other.

During the recording operation of the recording head 101, the arrow X1
FIG. 6B shows a state in which the sheet has moved in the direction and is in contact with the sheet floating prevention member 113. At this time, the edge portion 113c of the sheet floating prevention member 113 comes into contact with the slope 101c of the guide portion 101a of the recording head 101 first, but the guide portion 101a of the recording head 101 is not a portion that affects ejection. No failure such as head destruction occurs. Further, the edge portion 113c of the sheet floating prevention member 113 has an inclined surface 101 of the guide portion 101a.
After hitting c, the end portion 11 of the sheet floating prevention member 113 is moved as the recording head moves in the direction of arrow X1.
3c and the convex portions 113a and 113b are sequentially guided below the recording head 101 (on the recording sheet 401 side) by the inclined surface 101c of the guide portion 101a.

Further, when the recording head 101 advances in the direction of arrow X1 as shown in FIG. 6C, the convex portions 113a and 113b of the sheet floating prevention member 113 and the guide portion 101a of the recording head 101 are in contact with each other, Paper floating prevention member 1
Since the end portion (edge) 113c of 13 is far from the recording head 101, the end portion (edge) 113c of the sheet floating prevention member 113 is the nozzle portion 101b of the recording head 101.
Does not come into contact with. Note that in FIG. 6C, the recording head 10
Although it seems that the convex portions 113a and 113b of the sheet floating prevention member 113 hit the nozzle portion 101b of No. 1, the convex portion 11 of the sheet floating prevention member 113 as shown in FIG.
Since 3a and 113b are arranged at positions avoiding the nozzle portion 101-1 of the recording head 101 in the sheet conveying direction N, they only contact the guide portion 101a of the recording head 101 and the sheet floating prevention member 113 and the nozzles are prevented. Part 101
-1 never touches.

As described above, when the displacement amount e of the free end side edge 113c of the sheet floating prevention member 113 is larger than d in FIG. 5, as shown in FIGS. 6 (a) to 6 (c). In addition, the convex portion of the sheet floating prevention member functions. However, when the paper thickness or the number of recording papers conveyed by double feeding is not so large, unlike the above description, the convex portions 113a and 113b of the paper floating prevention member 113 have the slopes 101c of the guide portion 101.
Instead, it may come into contact with the guide portion 101a on the peripheral surface of the nozzle portion 101b of the recording head 101 as it is. For example, there is a case where the displacement amount e becomes equal to d in FIG.

Also in this case, since the end portion (edge) 113c of the sheet floating prevention member 113 is away from the recording head 101 during the movement of the recording head, the end portion (edge) 113c of the sheet floating prevention member 113 is Recording head 101
Does not come into contact with the nozzle portion 101b. During the movement of the recording head, the convex portions 113a and 113b of the paper floating prevention member 113 slide on the guide portion 101a on the peripheral surface of the nozzle portion 101b of the recording head 101, and the paper floating prevention member 11
The edge 113c of the third sheet 3c does not come into contact with the nozzle portion 101b of the recording head 101.
The recording head 101
The nozzle portion 101b is not damaged.

As described above, when it can be assumed that the paper thickness or the number of conveyed recording papers by double feeding is not so large, if the recording head has a portion other than the nozzle portion with which the convex portion of the paper floating prevention member abuts, The guide portion 101 having the slope 101c may be omitted, but it is more preferable to have it.

Finally, the amount of protrusion of the convex portion of the sheet floating prevention member will be described.

If the protruding amount of the convex portion is too small, the effect cannot be obtained and the recording head may be destroyed. On the other hand, if it is too high, the recording head 101 and the convex portion of the sheet floating prevention member are always in contact with each other during normal operation, and it is not possible to obtain good image quality.

In practice, it is sufficient that the effect can be secured when the thickest sheet (or sheet bundle by double feeding) comes in, so that the sheet can be conveyed by the conveying roller 108 and the pinch roller 109.

That is, as shown in FIG. 7, the displacement of the sheet floating prevention member 113 when the maximum transportable sheet 401 is inserted is h2, and the protrusion amount of the convex portions 113a and 113b is h1,
When the distance from the fixed end of the sheet floating prevention member 113 to the edge 113c on the free end side is L1, and the distance from the fixed end of the sheet floating prevention member 113 to the centers of the convex portions 113a and 113b is L2,

[0042]

## EQU00002 ## h2 <L2.times.sin {sin- ¹ (h2 / L
1)} + h1 so that 1 of the sheet floating prevention member 113 is satisfied.
By setting the protrusion amount h1 of 13a and 113b, it is possible to avoid a collision that destroys the recording head in any case.

As described above, by providing the paper-floating prevention member with the convex shape, even when the paper-floating prevention member is deformed due to a large double feed due to a paper feeding failure, the recording head is destroyed. The worst situation can be avoided.
Further, even when the user has passed through a paper thicker than usual, the failure can be similarly avoided, and the reliability of the device can be improved.

It should be noted that, with reference to FIG. 4 to FIG.
Sheet floating prevention member 113 for suppressing the floating of the non-reference side edge of No. 1
It has been described that the convex portion having the above-described arrangement and size is provided on the surface of the recording head 101 side, but as shown in FIGS. 2 and 3, the sheet float for suppressing the floating of the reference side edge of the sheet 401. The prevention member 112 has the same arrangement and size as the convex portion 11
2a and 112b are provided. Therefore, paper 4
When the recording head 101 moves to the reference end side of No. 01, thick paper is transported or large-duplex feeding occurs, and the paper floating prevention member 1
Even if 12 is in a position where it abuts the recording head 101, it is possible to avoid a collision that destroys the recording head due to the effect of the convex portions 112a and 112b.

In this embodiment, one convex portion is provided on the upper surface of the sheet floating prevention member on the upstream side and one on the downstream side in the recording medium conveyance direction. One convex portion may be provided only on the upstream side in the transport direction, and the convex portion on the recording medium floating prevention member of the present invention may avoid a portion of the recording head that is substantially involved in recording, regardless of the number and location. If it is provided at the position, the same effect of the convex portion as described above can be obtained.

Although the serial type has been described as an example, the line type is also applicable to the present invention as long as the recording head has a function of moving in a direction intersecting the recording medium conveying direction.

(Second Embodiment) In the first embodiment, the sheet floating prevention member is provided with a convex shape on both the upstream side and the downstream side in the sheet conveying direction. However, there are restrictions on the nozzle row in the recording head. In some cases, even if only one of the upstream side and the downstream side of the sheet floating prevention member is provided with a convex shape, a sufficient effect can be obtained.

(Other Embodiments) The present invention brings excellent effects particularly in an ink jet recording apparatus for recording by forming flying droplets by utilizing thermal energy among the ink jet recording methods. .

Regarding the typical structure and principle thereof, see, for example, US Pat. Nos. 4,723,129 and 4740.
What is done using the basic principles disclosed in 796 is preferred. This method can be applied to both the so-called on-demand type and continuous type, but especially in the case of the on-demand type, liquid (ink)
By applying at least one drive signal to the electrothermal converter arranged corresponding to the sheet or liquid path in which is stored, a rapid temperature rise corresponding to the recorded information and exceeding nucleate boiling is applied. , It is effective because it generates heat energy in the electrothermal converter, causes film boiling on the heat-acting surface of the recording head, and as a result, can form bubbles in the liquid (ink) that correspond one-to-one to this drive signal. Is. The liquid (ink) is ejected through the ejection openings by the growth and contraction of the bubbles to form at least one droplet. It is more preferable to make this drive signal into a pulse shape because bubbles can be immediately and appropriately grown and contracted, so that liquid (ink) ejection with excellent responsiveness can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise on the heat acting surface 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 specifications, The present invention also includes configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose a configuration in which a heat acting portion is arranged in a bending region.

In addition, JP-A-59-123670 discloses a structure in which a common slit is used as a discharge portion of the electrothermal converter for a plurality of electrothermal converters, and a pressure wave of thermal energy is absorbed. The present invention is also effective as a configuration based on Japanese Patent Application Laid-Open No. 59-138461, which discloses a configuration in which an opening corresponds to a discharge portion.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a configuration of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized. If you list these specifically,
Capping means, cleaning means, pressurizing or sucking means for the recording head, preheating means using an electrothermal converter or another heating element or a combination thereof, and a preliminary ejection mode for performing ejection other than recording It is also effective to perform stable recording.

Further, as the recording mode of the recording apparatus, not only the mainstream color such as black is recorded but also the recording head may be integrally formed or a plurality of them may be combined. The present invention is also extremely effective for a device provided with at least one of full colors by color mixing.

In the embodiment of the present invention described above, the ink is described as a liquid, but the ink solidifies at room temperature or lower and softens at room temperature, or is a liquid, or the above-mentioned. In the inkjet method, since the temperature of the ink itself is 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, the ink is applied when a use recording signal is applied. May be liquid.

In addition, the temperature rise due to the thermal energy is positively prevented by using it as the energy for changing the state of the ink from the solid state to the liquid state, or the ink is solidified in a standing state for the purpose of preventing evaporation of the ink. In some cases, such as ink that is liquefied by applying heat energy according to a recording signal and ejected as a liquid ink, or one that has already started to solidify when it reaches a recording medium. The use of an ink having a property of being liquefied only by heat energy is also applicable to the present invention. In such a case, the ink is disclosed in JP-A-54-5684.
No. 7 or JP-A-60-71260, a mode in which the porous sheet is opposed to the electrothermal converter in the state of being held as a liquid or solid in the recess or through hole 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 a form of the recording apparatus according to the present invention, in addition to the one provided integrally or separately as an image output terminal of information processing equipment such as a word processor or a computer, a copying apparatus combined with a reader or the like, May take the form of a facsimile machine having a transmission / reception function.

[0058]

As described above, according to the present invention, the following effects can be obtained.

First, in a recording apparatus having recording medium conveying means for conveying a recording medium and means for moving the recording head in a direction intersecting the recording medium conveying direction, the conveying surface of the recording medium and the recording head are provided. A floating prevention member for a recording medium having an area covering an end portion of the recording medium in a direction intersecting the recording medium conveyance direction between the floating area and the moving area of the convex portion on the surface of the floating prevention member on the recording head side. By providing the recording medium, even when a recording medium such as thick paper is conveyed or a plurality of recording mediums are conveyed, the recording head and the edge of the floating prevention member of the recording medium do not collide with each other and the recording head is not destroyed. The reliability of the device can be improved.

Secondly, in addition to the first effect, the convex portion of the anti-floating member is located at a position that does not substantially coincide with the recording-related portion of the recording head in the recording medium conveyance direction. It is possible to minimize damage to the recording head by the prevention member.

Thirdly, in the moving direction of the recording head, the distance from the fixed end of the floating prevention member to the end on the free end side is L1, and from the fixed end of the floating prevention member to the center of the convex portion. Is L2, the protrusion amount of the convex portion of the floating prevention member is h1, and the displacement amount of the free end side end portion of the floating prevention member when the recording medium having the maximum thickness that can be passed is h2. H2 <L2 × sin {sin ⁻¹ (h2 / L1)} +
By setting the protrusion amount h1 of the convex portion of the anti-floating member so that the relationship of h1 is established, the convex portion of the anti-floating member does not come into contact with the recording head at the time of normal conveyance, and the recording medium such as thick paper or a plurality of It is possible to effectively act the convex portion when the conveyance of overlapping sheets occurs.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a serial inkjet printer that is a first embodiment of a recording apparatus of the present invention.

FIG. 2 is a top view of a serial type ink jet printer which is a first embodiment of the recording apparatus of the present invention.

FIG. 3 is a schematic view of the inkjet printer according to the first exemplary embodiment of the present invention as viewed from a direction intersecting a recording paper conveyance direction.

FIG. 4 is a plan view showing a floating prevention member at an end portion in the direction intersecting the conveyance direction of the recording paper and its periphery in the inkjet printer according to the first embodiment of the present invention.

FIG. 5 is a schematic view of the floating prevention member at the end portion in the direction intersecting the conveyance direction of the recording sheet and its periphery in the inkjet printer of the first embodiment of the present invention, as viewed from the sheet conveyance direction.

6 (a) to 6 (c) are schematic views of the action of the paper floating prevention member when a plurality of sheets of paper are being conveyed, as seen from the paper conveyance direction, according to the first embodiment of the present invention.

FIG. 7 is a front view showing the dimensional relationship of the convex portions of the paper floating prevention member of the inkjet printer according to the first embodiment of the present invention.

[Explanation of symbols]

101 recording head 101a guide parts 101-1, 101b nozzle part 102 carriage 103 guide shaft 104 belt 105 drive motor 106 paper feed base 106-1 right edge (paper reference side edge) 107 paper transport motor 108 transport roller 109 pinch roller 110 Pinch roller springs 111 Platens 112, 113 Paper floating prevention members 112a, 113a Upstream convex portions 112b, 113b of the paper floating prevention member in the paper transport direction Downstream convex portions 113c of the paper floating prevention member in the paper transport direction Edges (edges) 116 chassis 201 paper feed roller 401 recording paper 401a non-reference side edge 402 recording area 403 spur 404 paper ejection roller

Claims (5)

[Claims] 1. A recording apparatus, comprising: a recording medium conveying means for conveying a recording medium; and a means for moving the recording head in a direction intersecting with the recording medium conveying direction. A floating prevention member for a recording medium, which has an area covering an end portion of the recording medium in a direction intersecting the recording medium conveyance direction between the area, and a convex portion is provided on a surface of the floating prevention member on the recording head side. A recording device characterized by being provided. 2. The recording apparatus according to claim 1, wherein the floating prevention member is supported in a cantilever manner, and a floating surface of the recording medium is prevented by a side surface opposite to the convex portion on the free end side. 3. The recording apparatus according to claim 1, wherein the convex portion of the floating prevention member is located at a position that does not substantially coincide with a portion of the recording head relating to recording in the recording medium conveyance direction. 4. In the moving direction of the recording head, the distance from the fixed end of the floating prevention member to the end on the free end side is L1, and the distance from the fixed end of the floating prevention member to the center of the convex portion. L2, the protrusion amount of the convex portion of the floating prevention member is h1, and the displacement amount of the free end side end portion of the floating prevention member when the recording medium having the maximum thickness that can be passed is h2.
Then, h2 <L2 × sin {sin ⁻¹ (h2 / L1)} +
The recording apparatus according to claim 1, wherein the protrusion amount h1 of the convex portion of the floating prevention member is set so that the relationship of h1 is established. 5. The recording head is an ink jet type.
The recording device according to claim 1.