JPH08224864A - Ink jet recording device - Google Patents

Abstract

PURPOSE: To realize high printing quality at low cost by a method wherein the uneven portion so called cockling developing in a recording sheet during recording is reduced without conditioning. CONSTITUTION: The ink jet recording device is equipped with a recording head, which is arranged opposite to a platen 5 and reciprocates on a straight line, a conveying roller 3, which conveys a recording sheet 1 normal to the travelling direction in a space between the travelling locus plane of the recording head and a platen 5, and two-stage discharge roller shafts 6 and 7 for discharging the recording sheet recording with the recording head 13 and a pair of spurs 6a and 7a. In addition, some parts of the discharge roller shafts are made of elastic parts 6b and 7b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus in which cockling is reduced by a plurality of discharge rollers and the number, position, discharge pressure of spurs urged against the discharge rollers, and a regulating member.

[0002]

2. Description of the Related Art Conventionally, in an ink jet recording apparatus, as a means for ejecting a sheet, a sheet ejection roller and a spur which presses the printing surface side have been used. In the case of recording by the ink jet method, it is known that the difference in the density of ink causes a difference in expansion and contraction of fibers constituting the recording sheet, so that a so-called cockling uneven portion is generated on the recording sheet during recording.

In particular, when printing image data or the like,
The feed pitch of the recording sheet is made small, the image data is randomly divided, and the number of times of scanning of the carriage is increased to perform printing, thereby eliminating the feed pitch unevenness. When it is small, the recording time increases, and the amplitude of the unevenness on the recording sheet increases. As a result, the recording head and the recording sheet may rub against each other, impairing the image quality.

Therefore, as shown in FIG. 18, a head gap dial 106, which is an adjusting means for adjusting the position of the recording head with respect to the recording sheet, is provided, and the adjustment is left to the user. In addition, a method of reducing the amplitude of unevenness by providing a heater has also been adopted.

[0005]

However, in the above-mentioned conventional example, the user must adjust the distance between the recording head and the recording sheet according to the print pattern. Moreover, the number of mechanical parts related to the adjusting means and the like increases, and as a result,
There is a problem that not only the cost is increased, but also the recording device is enlarged.

Further, in the method of adjusting the distance between the recording sheet and the recording head by the adjusting means as described above, since the position adjusting mechanism moves the head position around the axis, recording is performed from the ejection surface of the recording head. The relative distance to the printing surface of the sheet greatly differs between the upstream side and the downstream side in the conveying direction of the recording sheet. Especially in the case of color printing, if the distance varies depending on the position of the recording head, the true landing position changes for each color, which causes the problem of color unevenness and deviation of ruled lines.

In view of the above-mentioned problems of the prior art, the present invention reduces the unevenness of the so-called cockling, which occurs on the recording sheet during recording, and realizes no adjustment of the sheet interval, thereby reducing the cost. It is also an object of the present invention to provide an ink jet recording apparatus with high printing quality.

[0008]

In order to achieve the above object, the ink jet recording apparatus of the first invention is arranged so as to face a platen and reciprocates on a straight line, and a recording head when the recording head is moved. Conveying means for conveying a sheet-shaped medium in a space orthogonal to the moving direction of the recording head in the space between the platen and the movement locus surface of the ejection surface of the recording head, and the recording means recorded by the recording head. A plurality of discharging means for discharging the sheet-like medium, wherein the discharging means is arranged facing the platen, and a plurality of spurs arranged on a straight line substantially parallel to the moving direction of the recording head; The discharge roller comprises a pair of discharge roller shafts that are installed in parallel with the direction of arrangement of the spurs and that are biased toward the spur and that have a plurality of rollers that come into contact with the spurs. Wherein the portion of an elastic portion.

According to a second aspect of the present invention, the recording head is arranged to face the platen and reciprocates on a straight line, and a moving locus surface by the ejection surface of the recording head when the recording head is moved and the platen. A conveying means for conveying the sheet-shaped medium in a space orthogonal to the moving direction of the recording head, and a plurality of stages of discharging means for discharging the sheet-shaped medium recorded by the recording head. The ejecting means includes a plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head, and is disposed on the platen in parallel with the arrangement direction of the spurs on the side of the spurs. A pair of biased discharge roller shafts having a plurality of rollers that come into contact with the spurs,
The biasing force of the discharge roller shaft toward the spur in the discharging means of the second stage is set lower than the biasing force of the discharge roller shaft toward the spur in the discharging means of the second stage. .

In a third aspect based on the first aspect, the urging force of the discharge roller shaft to the spur side in the first discharging means is the spur side discharge roller in the second discharging means. It is characterized by being set lower than the urging force of the shaft.

According to a fourth aspect of the present invention, a recording head is disposed so as to face the platen and reciprocates on a straight line, and a movement locus surface by the ejection surface of the recording head when the recording head is moved and the platen. A space is provided with a conveying means for conveying the sheet-shaped medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharge means for discharging the sheet-shaped medium recorded by the recording head, The discharging means is a spur arranged opposite to the platen and arranged in a plurality on a straight line substantially parallel to the moving direction of the recording head,
The discharge means of the first stage comprises a pair with a discharge roller shaft having a plurality of rollers that are installed in the platen in parallel with the direction of arrangement of the spurs and are urged toward the spur and are in contact with the spurs. A rib is connected to the platen between the second stage of the discharging means and the spur and roller contact point of the first stage discharging means and the spur and roller contact point of the second stage discharging means. It is characterized in that it is lower than the straight line height and is arranged on an extension line connecting the rollers of the discharging means in a plurality of stages.

In a fifth aspect based on the third aspect, a rib is provided on the platen between the first-stage discharging means and the second-stage discharging means, and a spur of the first-stage discharging means is added. And a height lower than a straight line connecting the contact point of the roller and the contact point of the spur of the second stage and the contact point of the roller, and is arranged on an extension line connecting the rollers of the discharge means of a plurality of stages. Characterize.

According to a sixth aspect of the present invention, a recording head is disposed so as to face the platen and reciprocates on a straight line, and between the platen and the movement locus surface by the ejection surface of the recording head when the recording head is moved. A space is provided with a conveying means for conveying the sheet-shaped medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharge means for discharging the sheet-shaped medium recorded by the recording head, The discharging means is a spur arranged opposite to the platen and arranged in a plurality on a straight line substantially parallel to the moving direction of the recording head,
The discharge means of the first stage comprises a pair with a discharge roller shaft having a plurality of rollers that are installed in the platen in parallel with the direction of arrangement of the spurs and are urged toward the spur and are in contact with the spurs. The spur interval is about 13 mm or less.

According to a seventh aspect of the present invention, a recording head is disposed so as to face the platen and reciprocates on a straight line, and between the platen and the movement locus surface by the ejection surface of the recording head when the recording head is moved. A space is provided with a conveying means for conveying the sheet-shaped medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharge means for discharging the sheet-shaped medium recorded by the recording head, The discharging means is a spur arranged opposite to the platen and arranged in a plurality on a straight line substantially parallel to the moving direction of the recording head,
The platen comprises a pair of discharge roller shafts installed parallel to the spur arrangement direction and biased toward the spur and having a plurality of rollers abutting the spur, and straddles a plurality of stages of the discharge means. And a holding member for holding a plurality of spurs so as to be slidably rotatable.

An eighth invention is characterized in that, in the sixth invention, a holding member for slidably holding a plurality of spurs is provided across a plurality of stages of the discharging means.

According to a ninth aspect of the invention, a recording head is arranged to face the platen and reciprocates on a straight line, and a moving locus surface by the ejection surface of the recording head when the recording head is moved and the platen. A space is provided with a conveying means for conveying the sheet-shaped medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharge means for discharging the sheet-shaped medium recorded by the recording head, The discharging means is a spur arranged opposite to the platen and arranged in a plurality on a straight line substantially parallel to the moving direction of the recording head,
The discharge means of the first stage comprises a pair with a discharge roller shaft having a plurality of rollers that are installed in the platen in parallel with the direction of arrangement of the spurs and are urged toward the spur and are in contact with the spurs. In the vicinity of the spur of No. 2, there is provided a restriction portion for restricting a mountain portion due to cockling of the sheet medium so that the recording medium does not come into contact with the recording head.

In a tenth aspect based on the seventh aspect, a cockling of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. It is characterized in that a regulating portion for regulating the mountain portion is provided, and the regulating portion is provided on the holding member.

In an eleventh aspect based on the ninth aspect, the height distance between the end of the regulating portion in contact with the sheet-like medium and the tip of the spur of the first discharging means is about 1 mm. It is characterized by

According to a twelfth aspect of the present invention, in the third aspect of the present invention, the spacing of the spurs of the first-stage discharging means is about 13 mm or less, and a plurality of spurs are slidably rotated across the plurality of stages of discharging means. It is characterized in that it is provided with a holding member that holds it as much as possible.

According to a thirteenth aspect of the present invention, in the third aspect, a cockling of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. A regulating portion for regulating the mountain portion is provided, and a height distance between an end portion of the regulating portion in contact with the sheet-like medium and a tip end of the spur of the discharging means in the first stage is about 1 mm. And

According to a fourteenth aspect of the present invention, in the fifth aspect of the present invention, the spur spacing of the discharge means of the first stage is about 13 mm or less, and a plurality of spurs are slidably rotated across the plurality of stages of the discharge means. It is characterized in that it is provided with a holding member that holds it as much as possible.

In a fifteenth aspect based on the fifth aspect, a cockling of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. A regulating portion for regulating the mountain portion is provided, and a height distance between an end portion of the regulating portion in contact with the sheet-like medium and a tip end of the spur of the discharging means in the first stage is about 1 mm. And

According to a sixteenth invention, in the eighth invention, a cockling of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. A regulating portion for regulating the mountain portion is provided, and a height distance between an end portion of the regulating portion in contact with the sheet-like medium and a tip end of the spur of the discharging means in the first stage is about 1 mm. And

In a seventeenth aspect based on the fourteenth aspect, a cockling of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. There is a regulation section that regulates the mountains.
The height distance between the end of the regulating portion in contact with the sheet-like medium and the tip of the spur of the discharging means in the first stage is about 1 mm.
Is characterized in that.

[0025]

According to the present invention configured as described above, when the sheet-shaped medium is conveyed by the conveying means to the space between the platen and the recording head, the sheet-shaped medium is recorded by the recording head and ejected by the ejecting means. Even if a so-called cockling uneven portion occurs, since a part of the discharging roller shaft that constitutes the discharging means is an elastic portion, the discharging roller moves away from the recording head with respect to the cockling unevenness,
The convex portion of the sheet-shaped medium does not have to contact the recording head.

Further, in addition to the discharging means having a plurality of stages, the urging force of the discharging roller shaft toward the spur in the discharging means of the first stage is set lower than that of the second stage. Therefore, in the first-stage discharging means, the discharging roller is moved away from the recording head as described above, and the distance between the sheet-shaped medium and the recording head can be kept constant, while
Even when a sheet-shaped medium having a heavy weight or a sheet-shaped medium whose mass is increased by printing with a high duty ratio, the trailing edge of the sheet is lifted and comes into contact with the recording head when the sheet is separated from the conveying means by the second discharging means. There is no.

Then, ribs are provided on the platen between the first-stage discharging means and the second-stage discharging means, the spur and roller contacts of the first-stage discharging means and the second-stage discharging means. By arranging the spout of the discharging means and the contact point of the roller at a height lower than a straight line and on an extension line connecting the rollers of the discharging means in a plurality of stages, contact with the recording head due to curling of the sheet-shaped medium is prevented. It is possible to reduce.

Further, by setting the interval between the spurs for assisting the discharge of the sheet-shaped medium to be about 13 mm or less, or by providing the regulating portion near the spurs on the printing surface side of the sheet-shaped medium, the cockling can be performed without adjustment. It is possible to avoid the contact between the recording head and the sheet-like medium due to.

[0029]

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

(First Embodiment) FIG. 1 is a plan view showing a first embodiment of an ink jet recording apparatus of the present invention, and FIG. 2 is a sectional view showing a first embodiment of the ink jet recording apparatus of the present invention. is there.

In FIG. 1 and FIG. 2, the recording sheet 1 fed by a feeding roller (not shown) from the direction of arrow A is formed by a wedge formed by a conveying roller 3 having a conveying gear 2 and a pinch roller 4. When it reaches the section, it is bitten. A conveyance motor (not shown) is driven to convey the recording sheet 1 by the conveyance roller 3 to a writing position, and recording is performed from that position based on data from a personal computer or the like. The recording sheet 1 has ribs 5 on the platen 5.
The discharge roller 6a and the spur 9 are reached along a and 5b. Here, the positions of the ribs 5a and 5b in the plane direction are arranged on the extension lines of the discharge roller 6a and the discharge roller 7a (see FIG. 1). Also, the starting point 5a of the rib 5a
₁ and the starting point 5b _{1 of the} rib 5b are different from each other, and when a thick recording sheet is conveyed, the rib 5a ₁ at the time of rib contact that causes the largest load torque of the conveyance motor due to the configuration of the conveyance path.
In order to reduce the load at the points, the ribs are arranged at a rough interval.

The distance between the recording head 13 and the recording sheet 1 until the recording sheet 1 reaches the discharge roller 6a is determined by the heights of the ribs 5a and 5b.
The heights of the ribs 5a and 5b are such that the recording head or the like is not rubbed due to the warp of the recording sheet or the warp due to the recording pattern, and the jam of the recording sheet 1 does not occur. It is set to height.

At the time of discharging, the leading end of the recording sheet 1 pushes down the discharging roller shaft 6 and the discharging roller 6a, which are urged toward the spur 9 by the compression spring 8 in a direction substantially perpendicular to the conveying direction, so that the rib 5
reaching the discharge roller 7 and the spur 10 while abutting on c,
Further, the discharge roller shaft 7 and the discharge roller 7a, which are biased toward the spur 10 by the compression spring 8, are pushed down. Here, the spurs 9 and 10 are obtained by etching a stainless steel thin plate, and have a tip angle of about 25 ° to 30 °. Further, the spurs 9 and 10 are provided on spur shafts 9a and 10 which are insert-molded with resin, and the spur shaft 9a is disposed on the flat surface of the guide rail 11 made of a metal plate via the compression spring 8 by the discharge roller 6a. It is configured to be slidably rotated by being urged by an electric force. Therefore, the recording sheet 1
The distance between the recording head 13 and the recording head 13 is determined by the accuracy of each component, and there is no distance adjustment mechanism. The spur shaft 10a is a bearing portion 12a of the spur holder 12 which is a resin holding member.
It is sliding and rotating.

The contact point of the spur 10 with the recording sheet 1 is the spur 9
Is set at a position higher than the contact point with the recording sheet 1, and the discharge roller train and the spur train that are discharge means are configured in two stages in the transport direction, so that a postcard having a relatively heavy weight and a thick envelope It is possible to prevent the rear end of the recording sheet 13 from being rubbed against the recording head 13 by its own weight when ejected from the pinch roller 4 or rubbed against the recording head 13 by curling the recording sheet 1.

FIG. 3 is a front view of the first embodiment of the ink jet recording apparatus of the present invention as viewed from the discharge direction.

As shown in FIG. 3, an elastic portion 7b having a different shaft diameter is formed on the resin discharge roller shaft 7 which is urged toward the spur 10 by the compression spring 8. Further, as shown in FIG. 1, also in the discharge roller shaft 6, the elastic portion 6b is similarly formed.
Are formed.

FIG. 4 shows a situation in which recording is performed from the front end of the recording sheet 1 and the front end of the recording sheet 1 reaches the rib 5c provided between the discharge roller 6a and the discharge roller 7a. There is. FIG. 5 shows the discharge roller 6a and the discharge roller 7.
It shows the behavior based on the experiment of the recording sheet when there is no rib between a and.

As shown in FIGS. 4 and 5, the recording sheet 1
As recording is performed from the tip of the curl, the curl grows on the back side of the recording surface.

Therefore, the discharge roller 6a and the discharge roller 7
When there is no rib between the recording sheet 1 and the sheet a, the recording sheet 1 and the recording head 13 come into contact with each other at the portion B as shown in FIG. On the other hand, as shown in FIG. 4, the discharge roller 6a and the discharge roller 7a
If a rib 5c is provided between the recording sheet 1 and the rib, the curl amount is reduced by the waist of the recording sheet 1 as the tip of the recording sheet 1 is raised by the rib 5c, and the recording sheet 1 does not come into contact with the recording head. It has been confirmed experimentally. The height of the rib 5c is the same as that of the spur 9 and the discharge roller 6.
It is set lower than the height of the straight line connecting the contact point a and the contact point of the spur 10 and the discharge roller 7a. This is because if the height of the rib 5c is higher than the straight line height, it becomes a load when conveying an envelope or the like, which may cause defective ejection or the like.

Further, FIGS. 6 and 7 show the situation when an extremely strong sheet such as the plastic film 14 is being conveyed. In FIG. 6, the solid line on the platen 5 indicates the transport state before the plastic film 14 reaches the discharge roller 7a portion, and the alternate long and short dash line indicates the transport state after reaching the discharge roller 7a portion. On the other hand, the solid line in FIG.
The conveyance state of the plastic film 13 when there is no rib between a and the discharge roller 7a is shown, and the alternate long and short dash line shows the conveyance state after reaching the discharge roller 7a portion.

As shown in FIGS. 6 and 7, the discharge roller 6
When there is a rib between a and the discharge roller 7a and there is no rib, the distances c and d between the recording head and the recording head that determine the print quality when a sheet having an extremely strong rigidity such as the plastic film 14 is conveyed. <D. Also, the distance c,
The change rates c'and d'of d also satisfy c '<d'. Therefore, when the rib is provided, the displacement of the distance is smaller, and higher-quality recording can be performed even on a strong sheet.
The ribs are arranged on the platen surface on the extension lines of the discharge rollers 6a and 7a so as not to contact the valleys of the cock ring.

Next, the elastic portions 6b and 7b of the discharge roller shafts 6 and 7 will be described.

As shown in FIG. 1, the discharge roller shaft 6 is spured by two compression springs 8 arranged near both ends thereof.
The discharge roller shaft 7 is biased to the spur 10 side by four compression springs 8 having the same spring constant as the compression springs 8 while being slidably rotatable in a state of being biased to the side.

The urging force of the compression spring 8 for urging the discharge roller shaft 6 is set to a load lower than the waist of the cockling of the recording sheet 1. This is because, when the recording sheet 1 is cockled, the ejection roller shaft 6 is moved away from the recording head 12 by being defeated by the waist of the cockling during ejection. Furthermore, by making a part of the discharge roller shaft 6 an elastic portion 6b, the load applied to the discharge roller shaft 12 is made uniform, the load applied to the spur 9 is reduced at the same time, and the trace of ink transfer by the spur 9 is eliminated. It is possible.

The biasing force applied to the discharge roller shaft 6 or the discharge roller shaft 7 is different depending on the number of the compression springs 8 for the following reason.

At the discharge roller shaft 6 part, the distance between the recording sheet 1 and the recording head 13 is kept constant, and when the cockling becomes large due to the print pattern, the discharge roller shaft 6 is formed.
This is to prevent the contact with the recording sheet by keeping away from the recording head 13. It is also for preventing the recording sheet from being folded when the image density is high.

On the other hand, in the discharge roller shaft 7, the trailing end of the recording sheet having a heavy weight such as an envelope or a postcard or the weight of the recording sheet increased by printing with a high duty is the conveying roller 3.
Also, the biasing force of the compression spring 8 is set higher than that of the discharge roller 6a so that the recording head is not rubbed by the reaction when it is disengaged from the pinch roller 4.

Further, the distance between the recording head 1 and the conveyance path of the recording sheet 1 which is determined by the discharge roller 6a and the spur 9, and the conveyance roller and the pinch roller 4, is determined depending on the type of the recording sheet and the disturbance outside the apparatus. It is set with an appropriate spring load so that it can be kept constant. At this time, if the spring load N ₆ urged by the discharge roller shaft ₆ is lower than the spring load N ₇ urged by the discharge roller shaft 7, the friction with the head rubs regardless of the type of recording sheet or the operating environment conditions. It has been experimentally confirmed that the amount can be reduced (N ₇ > N ₆ ). Further, a total of six compression springs 8 for the same discharge roller are used here. The discharge roller shaft 6 has two, and the discharge roller shaft 7 has four.
Each of the discharge roller shafts 6 and 7 has a different bearing surface height so as to have a different load point height in order to obtain a desired spring load.

Next, spurs 9, 10 and spur holder 12
Will be described in detail.

FIG. 8 is a schematic view of the first embodiment of the ink jet recording apparatus of the present invention seen from above, and FIG. 9 is shown in FIG.
FIG. In these figures, the dotted line shows the unit in which the spur holder 12 and the spurs 9 and 10 are unitized, and this recording apparatus has eight unit parts. The distance between rotatable spurs disposed on the recording surface side of the recording sheet 1 is about 13 mm or less.

Further, FIG. 10 shows a cross section taken along the line BB in FIG.

As shown in FIGS. 8 to 10, the spur holder 12 is positioned by the abutting surface 12b of the spur holder 12 and the abutting surface 11a of the guide rail 11, and the notch 11b of the guide rail 11 and the spur. It is locked and fixed by the engaging portion 12c of the holder 12.

Further, the abutting portion 12e of the regulating member 12d abuts on the abutting surface 11c on which the shaft of the spur 9 abuts, and the abutting portion 12e and the elastic portion 12f make the regulating member 12d.
The height of d is defined as h. In addition, the tip 12g of the regulating portion is
The edge has a smooth surface so that the ink is not rubbed. With such a configuration, spur 9
The distance H between the contact point C between the discharge roller 6a and the tip 12g of the regulating portion can be set accurately.

FIG. 11 is a front view showing a cockling state of the recording sheet when the regulating member 12d is not provided in the first embodiment of the ink jet recording apparatus of the present invention. The arrow D indicates the moving direction of the recording head 13. An alternate long and short dash line E on the extension line of the arrow D indicates the locus of the recording head 13. In the shaded area F, the cockling crest 1a of the recording sheet 1 and the recording head 13 are in contact with each other. In such a situation, not only rubbing marks are generated on the image, but also the recording head is damaged and the recording head is damaged. Shorten the life of.

FIG. 12 is a sectional view taken along line GG in FIG. Reference numeral 1b indicates an inclined surface on the printing surface side of the recording sheet 1 which is corrugated by cockling. Reference numeral 1c indicates an inclined surface on the back side of printing of the recording sheet 1. The shaded portion of F indicates that the recording head 13 and the recording sheet 1 are in contact with each other.

FIG. 13 is a front view showing a cockling state of the recording sheet when the regulating member 12d is provided in the first embodiment of the ink jet recording apparatus of the present invention. 14 shows a sectional view taken along the line JJ in FIG. As shown in these figures, the crest 1a due to the cockling of the recording sheet 1 is regulated by the tip 12g of the regulation portion of the spur holder 12 and the distance from the recording head 13 is limited. Does not occur.

If the distance H shown in FIG. 10 is too large, the leading end 12g of the regulating portion rubs the recording sheet 1 and disturbs the image before the ink dries. If it is too small, the size of the cockling cannot be regulated, and the recording head will be rubbed. In this embodiment, the height is set to about 1 mm, which is arranged near the spur 9 and has been experimentally good.

The spur holder 12 has a wall having a size equal to or larger than the outer diameter of the spurs 9 and 10 in order to prevent the tips of the spurs 9 and 10 from being bent due to disturbance and the tips of fingers to be damaged. 12h (see FIGS. 12 and 14).

In this embodiment, as shown in FIGS. 8 and 9, the set of three spurs and spur shafts is unitized to reduce the number of parts and the assembling process to reduce the cost, but the number of parts to be attached is the arrangement. Can be selected as desired. Further, the regulation member may be a component different from the spur holder. When the material of the regulating member is a fluororesin having good water repellency, rubbing marks are less likely to occur, so that the height H can be made smaller and the influence of cockling can be further reduced. Discharge rollers 6a, 7a
Is made of an elastomer resin, and the discharge roller shafts 6 and 7 are
Is a two-color molded product formed from a mold.

Further, the number of discharge rollers 6a and 7a axially attached to the two discharge roller shafts 6 and 7 is different (see FIG. 1).
The reason is as follows.

The discharge roller 6a is for keeping the distance from the recording sheet as described above and for keeping the deflection of the recording sheet due to the cockling away from the recording head.
Therefore, when there are more discharge rollers 6a than there are discharge roller shafts 7, there is no escape of the recording sheet due to cockling, the recording sheet surface below the recording head is bent, and not only the image is disturbed, but also the recording head. This is because there is a risk that it may cause rubbing. Meanwhile, the discharge roller 7
In the case of a, the discharge roller 7b is provided even in a place where there is no spur 10.
This is to prevent the recording sheet with high ink density from being folded and to increase the discharging force by its own weight so that the recording sheet can be reliably discharged even if the driving force for discharging is small.

(Second Embodiment) FIG. 15 is a front view showing a second embodiment of the ink jet recording apparatus of the present invention.

The discharge roller shaft 7 shown in FIG. 15 does not show an engaging method, but a transmission gear portion 7d is provided via a compression spring 15.
It is fixed to. Similarly, the discharge roller shaft 6 is provided with a compression spring. By forming the elastic portion in this way, the discharge pressure can be made uniform, the cycle by the cockling can be made more constant, and a high-quality image can be obtained.

(Third Embodiment) FIG. 16 is a front view showing a third embodiment of the ink jet recording apparatus of the present invention.

The outer diameter of the discharge roller shaft 16 shown in FIG. 16 is smaller than that of the discharge roller shaft 7 described in the first and second embodiments and is evenly reduced over the entire span. With such a configuration, the discharge pressure can be made uniform, and at the same time, the sliding load on the compression spring 8 for urging the spur side can be reduced.

(Second Embodiment) FIG. 17 is a sectional view showing a fourth embodiment of the ink jet recording apparatus of the present invention.

In FIG. 17, the rib 5d arranged on the platen 5 is an elastic portion made of, for example, a thin plate spring member. With such a configuration, the load torque applied to the motor described in the first embodiment can be reduced. Further, the load torque applied to the discharge roller shaft due to the thickness of the recording sheet can be further reduced by moving the rib 5e, and in particular, the printing accuracy after the trailing edge of the recording sheet 1 leaves the pinch roller 4 can be improved. It can be increased.

In the above-described embodiment, the present invention has been described using the printer in which the ink jet recording head is mounted on the carriage. However, for example, the ink jet recording head is provided with an outer shape substantially the same as that of the ink jet recording head. The configuration described in the present invention is preferably used even for an information processing apparatus that includes a scanner unit that is compatible with a recording head and that can be mounted on a carriage, and that can read image information from a document sheet supported by a platen. You can

Next, the above-mentioned ink jet recording apparatus using an ink jet recording head of an ink jet recording system in which the heat energy generated by the electrothermal converter is used as recording energy to eject ink from the ejection port for recording. Will be described in more detail.

With regard to its typical structure and principle, see, for example, US Pat. No. 4,723,129 and US Pat.
What is done using the basic principles disclosed in 740,796 is preferred.

This system is applicable to both the so-called on-demand type and the continuous type. In particular, in the case of the on-demand type, it corresponds to the sheet or liquid path holding the recording liquid (ink). By applying at least one drive signal corresponding to the recording information to the electrothermal converter arranged in such a manner as to give a rapid temperature rise to the recording liquid beyond nucleate boiling, thermal energy is applied to the electrothermal converter. Is generated and the recording liquid near the heat acting surface of the recording head is film-boiling. As a result, bubbles can be formed in the recording liquid in a one-to-one correspondence with this drive signal, which is effective.

The recording liquid is ejected into the atmosphere by the acting force generated in the process of growth and contraction of the bubbles to form at least one droplet.

It is more preferable to make this driving signal into a pulse shape, because the bubble growth and contraction are immediately and appropriately performed, so that the ejection of the recording liquid having an excellent responsiveness can be achieved. As this pulse-shaped drive signal, U.S. Pat. No. 4,463,3 is used.
Suitable are those described in U.S. Pat. No. 59, No. 4,345,262.

If the conditions described in US Pat. No. 4,313,124, which is an invention relating to the rate of temperature rise on the above-mentioned 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 ejection 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 configurations in which a heat acting portion is arranged in a bending region. Is.

Further, a full line type recording head having a length corresponding to the maximum width of the recording medium which can be recorded by the recording apparatus, or a combination of a plurality of recording heads as disclosed in the above-mentioned specification, It may have either a structure satisfying the length or a structure as one recording head integrally formed, but in any case, the present invention can more effectively exhibit the above-mentioned effects.

In addition, a replaceable chip type recording head or an ink supply tank that enables electrical connection to the apparatus body and supply of ink from the apparatus body when mounted on the apparatus body is used for recording. The present invention is also effective when a cartridge-type recording head provided integrally with the head itself is used.

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. .

Specifically, these are capping means, cleaning means, pressurizing or sucking means, electrothermal converters or other heating elements for the recording head, or preheating means for the combination thereof. It is also effective to add the above items, or to perform a preliminary ejection mode in which preliminary ejection different from recording is performed, so that a plurality of recording mediums may be provided.

Further, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but the recording head may be integrally formed or a plurality of combinations thereof may be used. The present invention is extremely effective for an apparatus provided with at least one of full colors by color mixing.

Furthermore, in the above-described embodiments of the present invention, the ink is described as a liquid, but even if the ink solidifies at room temperature or below, the ink will become liquid or soft when a recording signal is applied. Anything is fine.

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

[0083]

The present invention described above has the following effects. 1. By providing an elastic part on a part of the discharge roller shaft,
It is possible to move the sheet-shaped medium away from the recording head and realize no paper interval adjustment. 2. By setting the urging force of the discharge roller shaft in the second-stage discharging means toward the spur side to be higher than the urging force of the discharge roller shaft in the first-stage discharging means toward the spur side, a sheet-like sheet having a heavy weight is formed. Even when recording on a medium, the influence of cockling on the recording head can be reduced. 3. Ribs are provided on the platen between the first-stage discharging means and the second-stage discharging means, spur and roller contacts of the first-stage discharging means, and spur and rollers of the second-stage discharging means. The height of the recording medium is lower than the straight line connecting the contact points of and, and is arranged on the extension line connecting the rollers of the discharging means in a plurality of stages, curling can be suppressed even in a curled sheet medium without adjustment, and recording can be performed. The distance between the head and the sheet-shaped medium can be properly maintained. 4. By providing the regulating portion on the printing surface side of the sheet-shaped medium near the spur, it is possible to improve the printing quality and to adjust the paper interval, and at the same time, it is possible to reduce the size of the apparatus. 5. By providing the holding means that slidably and rotatably holds the plurality of spurs across the plurality of discharging means, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of an inkjet recording apparatus of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the inkjet recording apparatus of the present invention.

FIG. 3 is a front view of the ink jet recording apparatus according to the first embodiment of the present invention as viewed from the discharge direction.

FIG. 4 is a diagram showing a situation when the leading end of the recording sheet reaches a rib provided between the discharge rollers in the first embodiment of the invention.

FIG. 5 is a diagram showing a behavior based on an experiment of the recording sheet when there is no rib between the discharge rollers in the first embodiment of the present invention.

FIG. 6 is a diagram showing a situation when an extremely strong sheet such as a plastic film is being conveyed in the first embodiment of the present invention.

FIG. 7 is a diagram showing a situation when there is no rib during transport of the plastic film in the first embodiment of the present invention.

FIG. 8 is a schematic view of the first embodiment of the inkjet recording apparatus of the present invention as viewed from above.

9 is an enlarged view of a main part of FIG.

10 is a sectional view taken along line BB in FIG.

FIG. 11 is a front view showing a cockling state of a recording sheet when there is no regulating member in the first embodiment of the inkjet recording apparatus of the present invention.

FIG. 12 is a sectional view taken along line GG in FIG.

FIG. 13 is a front view showing a cockling state of a recording sheet when a regulating member is provided in the first embodiment of the inkjet recording apparatus of the present invention.

14 is a sectional view taken along line JJ in FIG.

FIG. 15 is a front view showing a second embodiment of the ink jet recording apparatus of the present invention.

FIG. 16 is a front view showing a third embodiment of the ink jet recording apparatus of the present invention.

FIG. 17 is a sectional view showing a fourth embodiment of the ink jet recording apparatus of the present invention.

FIG. 18 is a schematic perspective view of a conventional inkjet recording device.

[Explanation of Codes] 1 recording sheet 1a mountain 1b recording sheet surface 2 conveying gear 3 conveying roller 4 pinch roller 5 platen 5a, 5b, 5c rib 5a ₁ , 5b ₁ starting point 6, 7, 15, 16 discharge roller shaft 6a, 7a Discharge roller 7b Elastic part 7d Transmission gear part 8,15 Compression spring 9,10 Spur 10a Spur shaft 11 Guide rail 11a, 11c, 12b Abutment surface 11b Cutout part 12 Spur holder 12a Bearing part 12c Engaging part 12d Restricting member 12e Projection Contact part 12f Elastic part 12g Restriction part tip 12h Wall 13 Recording head 14 Plastic sheet

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Nojima 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Takeshi Iwasaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Soichi Hiramatsu 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiroyuki Inoue 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. ( 72) Inventor Akira Kida 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (17)

[Claims] 1. A sheet in a space between a platen and a recording head, which is arranged so as to face the platen and reciprocates on a straight line, and a movement locus surface by a discharge surface of the recording head when the recording head is moved. A discharging means for discharging the sheet medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharging means for discharging the sheet medium recorded by the recording head. Is a plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head, and is installed on the platen parallel to the arrangement direction of the spurs and is urged toward the spur, An ink jet recording apparatus comprising a pair of a discharge roller shaft having a plurality of rollers that come into contact with the spurs, and a part of the discharge roller shaft is an elastic portion. 2. A recording head, which is arranged to face the platen and reciprocates on a straight line, and a sheet in a space between the platen and a movement locus surface of the ejection surface of the recording head when the recording head is moved. A discharging means for discharging the sheet medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharging means for discharging the sheet medium recorded by the recording head. Is a plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head, and is installed on the platen parallel to the arrangement direction of the spurs and is urged toward the spur, A pair of discharge rollers having a plurality of rollers that come into contact with the spur and a biasing force of the discharge roller shaft toward the spur in the discharging means in the first stage are applied to the discharging means in the second stage. Kicking ink jet recording apparatus is set lower than the urging force of the discharge roller shaft to the spur side. 3. The ink jet recording apparatus according to claim 1, wherein the biasing force of the discharge roller shaft toward the spur in the discharge means of the first stage is applied to the spur side of the discharge means of the second stage. An ink jet recording apparatus characterized in that it is set to be lower than the biasing force of the discharge roller shaft. 4. A recording head, which is arranged so as to face the platen and reciprocates on a straight line, and a sheet in a space between the platen and a movement locus surface by the ejection surface of the recording head when the recording head is moved. A discharging means for discharging the sheet medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharging means for discharging the sheet medium recorded by the recording head. Is a plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head, and is installed on the platen parallel to the arrangement direction of the spurs and is urged toward the spur, It is composed of a pair of a discharge roller shaft having a plurality of rollers that come into contact with the spurs, and ribs are provided on the platen between the discharge means of the first stage and the discharge means of the second stage, Excretion The height of the spur of the roller and the contact of the roller and the contact of the spur of the second discharging means and the contact of the roller are lower than the straight line height, and are arranged on an extension line connecting the rollers of the discharging means of a plurality of stages. Inkjet recording device. 5. The ink jet recording apparatus according to claim 3, wherein a rib is provided on a platen between the first-stage discharging means and the second-stage discharging means, and the first-stage discharging means is provided. Is lower than the straight line connecting the contact point of the spur and roller with the contact point of the spur and roller of the discharging means of the second stage, and is arranged on the extension line connecting the rollers of the discharging means of plural stages. An ink jet recording apparatus characterized by the above. 6. A recording head, which is arranged so as to face the platen and reciprocates on a straight line, and a sheet in a space between the platen and a movement locus surface of an ejection surface of the recording head when the recording head is moved. A discharging means for discharging the sheet medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharging means for discharging the sheet medium recorded by the recording head. Is a plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head, and is installed on the platen parallel to the arrangement direction of the spurs and is urged toward the spur, An ink jet recording apparatus comprising a pair of discharge roller shafts having a plurality of rollers that come into contact with the spurs, and a gap between spurs of the discharge means in the first stage is about 13 mm or less. 7. A recording head, which is arranged so as to face the platen and reciprocates on a straight line, and a sheet in a space between the platen and a movement locus surface by a discharge surface of the recording head when the recording head is moved. A discharging means for discharging the sheet medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharging means for discharging the sheet medium recorded by the recording head. A plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head; A pair of a discharge roller shaft having a plurality of rollers that come into contact with the spurs, and a holding member that slidably and rotatably holds the plurality of spurs across a plurality of stages of the discharging means are provided. Jet recording apparatus. 8. The inkjet recording apparatus according to claim 6, further comprising: a holding member that holds a plurality of spurs in a slidable manner across a plurality of stages of the discharging means. Recording device. 9. A recording head, which is arranged so as to face the platen and reciprocates on a straight line, and a sheet in a space between the platen and a movement locus surface by an ejection surface of the recording head when the recording head is moved. A discharging means for discharging the sheet medium in a direction orthogonal to the moving direction of the recording head, and a plurality of discharging means for discharging the sheet medium recorded by the recording head. Is a plurality of spurs arranged opposite to the platen and arranged on a straight line substantially parallel to the moving direction of the recording head, and is installed on the platen parallel to the arrangement direction of the spurs and is urged toward the spur, It is composed of a pair of discharge roller shafts having a plurality of rollers that come into contact with the spur, and the sheet-shaped medium does not come into contact with the recording head in the vicinity of the spur of the discharge means of the first stage. An ink jet recording apparatus regulating portion for regulating the crests by cockling of the sheet-like medium is provided. 10. The ink jet recording apparatus according to claim 7, wherein a cock of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. The inkjet recording apparatus is characterized in that a regulating portion for regulating a mountain portion by a ring is provided, and the regulating portion is provided on the holding member. 11. The ink jet recording apparatus according to claim 9, wherein a height distance between an end portion of the regulation portion that is in contact with the sheet-like medium and a tip end of a spur of the discharging unit in the first stage is about 1 mm.
An inkjet recording apparatus characterized by the following. 12. The ink jet recording apparatus according to claim 3, wherein a spur interval of the discharging means of the first stage is about 13 mm or less, and a plurality of spurs are slid over the discharging means of a plurality of stages. An ink jet recording apparatus comprising a holding member that holds a movable body so as to be rotatable. 13. The ink jet recording apparatus according to claim 3, wherein a cock of the sheet-shaped medium is provided in the vicinity of the spur of the discharging means in the first stage so that the sheet-shaped medium does not come into contact with the recording head. A restriction part for restricting the mountain part by the ring is provided, and a height distance between an end part of the restriction part in contact with the sheet-shaped medium and a tip end of the spur of the discharging means in the first stage is about 1 mm.
An inkjet recording apparatus characterized by the following. 14. The ink jet recording apparatus according to claim 5, wherein the interval of the spurs of the discharging means of the first stage is about 13 mm or less, and a plurality of spurs are slid over the discharging means of a plurality of stages. An ink jet recording apparatus comprising a holding member that holds a movable body so as to be rotatable. 15. The ink jet recording apparatus according to claim 5, wherein a cock of the sheet-shaped medium is provided in the vicinity of the spur of the discharging unit in the first stage so that the sheet-shaped medium does not come into contact with the recording head. A restriction part for restricting the mountain part by the ring is provided, and a height distance between an end part of the restriction part in contact with the sheet-shaped medium and a tip end of the spur of the discharging means in the first stage is about 1 mm.
An inkjet recording apparatus characterized by the following. 16. The ink jet recording apparatus according to claim 8, wherein a cock of the sheet-shaped medium is provided in the vicinity of the spur of the first-stage ejecting unit so that the sheet-shaped medium does not come into contact with the recording head. A restriction part for restricting the mountain part by the ring is provided, and a height distance between an end part of the restriction part in contact with the sheet-shaped medium and a tip end of the spur of the discharging means in the first stage is about 1 mm.
An inkjet recording apparatus characterized by the following. 17. The ink jet recording apparatus according to claim 14, wherein a cock of the sheet-shaped medium is provided in the vicinity of the spur of the first-stage ejection unit so that the sheet-shaped medium does not come into contact with the recording head. A restriction part for restricting the mountain part by the ring is provided, and a height distance between an end part of the restriction part in contact with the sheet-shaped medium and a tip end of the spur of the discharging means in the first stage is about 1 mm.
An inkjet recording apparatus characterized by the following.