DE202004021526U1 - Ink cartridge and inkjet printer - Google Patents

Abstract

Ink cartridge, with:
an ink tank storing an ink; and
a pivot member pivotally supported in the ink container and having an equilibrium member carried to be positioned in an ink liquid when an amount of the ink in the ink container is not less than a predetermined amount;
a weight and a volume of the balance member are adjusted so that a rotational force received from the pivot member by a buoyancy force and a gravity generated at the balance member when the balance member is positioned in the ink liquid is in a first direction which is opposite to a second direction of a rotational force received from the pivot member by a buoyancy force and a gravity generated at the balance member when a part of the balance member protrudes from a liquid surface of the ink.

Description

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION

The The present invention relates to an ink cartridge which an ink jet head, an ink for performing a By discharging the ink, and an ink jet printer, the same includes.

DESCRIPTION OF THE RELATED TECHNOLOGY

An ink-jet printer is known in which an ink is discharged from nozzles onto a recording paper to perform the printing. Such an ink jet printer is generally provided with a removable ink cartridge. When an ink-jet head is driven to perform the discharging operation in a state where the ink in the ink cartridge is empty, not only the printing is performed, but sometimes the air enters the ink-jet head. The ink jet head into which the air has entered may not be used in some cases. Therefore, it is necessary to detect the amount of the ink stored in the ink cartridge. A method for detecting the amount of the ink is conceived in which the amount of the ink is detected by estimating and accumulating the amounts of the ink used each time the printing is performed. With such a calculation, however, an error tends to arise. Therefore, it is necessary to stop the use of the ink cartridge with a sufficient margin. As a result, the ink is wasted. Accordingly, the following technique has been proposed (see, for example, the laid-open Japanese Patent Application No. 9-001819 . 7 ). That is, a float having a specific gravity smaller than that of the ink is disposed on the ink contained in the ink cartridge. The height of the float floating on the ink is detected by the outside to detect the amount of the ink contained in the ink cartridge.

According to the technique disclosed by the Japanese Patent Application No. 9-001819 however, the float sometimes sticks to the wall surface, and the float is not moved down due to a disturbance such as the surface tension of the ink adhering to the inner wall surface of the ink tank of the ink cartridge. As described above, the technique disclosed by US Pat Japanese Patent Application No. 9-001819 has been proposed to suffer from the influence of the disturbance such as the surface tension of the ink. Therefore, a problem arises such that it is impossible to display a correct amount of the ink contained in the ink cartridge.

SUMMARY OF THE INVENTION

Accordingly a main object of the present invention is to provide a Ink cartridge, which makes it possible to measure the amount of ink, which is contained in the ink cartridge to display without passing through the disturbance, such as the surface tension of the ink, is excessive to be influenced, and an inkjet printer, the same includes, to create.

According to a first aspect of the present invention, an ink cartridge with an ink tank ( 11 . 201 ), which is an ink ( 200 ) stores; and a pivoting member ( 32 . 203 ) contained in the ink tank ( 11 . 201 ) is pivotally supported and that is an equilibrium member ( 33 . 202 ), which is supported to be positioned in an ink liquid, when an amount of the ink in the ink tank (FIG. 11 . 201 ) is not less than a predetermined amount, created; wherein a weight and a volume of the equilibrium member ( 33 . 202 ) are set so that a torque ( 204 ), of the pivoting member ( 32 . 203 ) by a buoyancy force and a gravitational force acting on the equilibrium member ( 33 . 202 ) are generated when the equilibrium member ( 33 . 202 is positioned in the ink liquid, is located in a first direction opposite to a second direction of a rotational force (FIG. 205 ) of the pivoting member by a buoyancy force and a gravity acting on the equilibrium member ( 33 . 202 ) are generated when a part of the equilibrium member ( 33 . 202 ) protrudes from a liquid surface of the ink.

24 Fig. 16 shows an example of the ink cartridge of the present invention. 24 Conceptually illustrates the arrangement and operation of the ink cartridge of the present invention. The ink cartridge of the present invention comprises an equilibrium member 202 that is worn so as not to contact the wall surface of an ink tank 201 For example, with the aid of a support member 203 in the ink tank 201 in which an ink 200 is stored.

As in 24A is shown in the ink cartridge of the present invention when the ink 200 in an amount not less than a predetermined amount in the ink tank 201 remains, the buoyancy force acting on the equilibrium member 202 works, greater than gravity. Therefore, the torque (arrow 204 who in 24A shown, rotational force in the first direction) in the direction toward the liquid surface of the ink 200 is directed. The equilibrium member 202 is ever yet worn so that the balance member 202 not on the liquid surface of the ink 200 Floats, that is, the equilibrium member 202 stays in the ink tank 200 , If the ink 200 is used, and the amount of ink in the ink tank 201 is decreased to be smaller than the predetermined amount (in particular, when the ink is reduced until a part of the balance member 202 protruding from the ink liquid surface), then the buoyancy force acting on the balance member 202 works, reduces. Therefore, gravity is at the equilibrium member 202 acts, greater than the buoyancy force. Therefore, acts as in 24B shown, the torque (arrow 205 who in 24B shown, rotational force in the second direction), which is toward the bottom surface of the ink container 201 is directed to the equilibrium member 202 , The equilibrium member 202 will go to the bottom surface of the ink tank 201 emotional.

The residual amount of the ink contained in the ink cartridge can be detected by detecting the deflection of the balance member 202 , as in 24 shown, for example, be detected using a sensor. In the case of the ink cartridge as described above, the balance member is 202 carried to make no contact with the wall surface in the ink container. Furthermore, the deflection path of the equilibrium member 202 be held to some extent. Therefore, it is possible to prevent the balance member 202 due to a disturbance, such as the surface tension of the ink, on the inner wall surface of the ink tank 201 adheres to the wall surface of the ink container sticking when the ink is reduced. It is possible to more correctly display the amount of ink in the ink cartridge.

In the ink cartridge of the present invention, the pivot member (FIG. 80 ) a link ( 32A ) contained in the ink tank ( 11 . 201 ) is pivotally supported, a detection target section ( 34A ) at one end of the link ( 32A ), and the equilibrium member ( 33A ) at the other end of the link ( 32A ) is included; and weights and volumes of the equilibrium member ( 33A ) and the acquisition target section ( 34A ) can be adjusted so that the rotational force generated by the pivoting member ( 80 ) by buoyancy forces and gravitational forces, each at the equilibrium member ( 33A ) and the acquisition target section ( 34A ) are generated when the entire equilibrium member ( 33A ) and the entire acquisition target section ( 34A ) are located in the ink liquid, is located in the first direction, which is opposite to the second direction of the rotational force, which of the pivot member ( 80 ) by buoyancy forces and gravitational forces, each at the equilibrium member ( 33A ) and the acquisition target section ( 34A ) are generated when parts of the equilibrium member ( 33A ) and the acquisition target section ( 34A ) project from the liquid surface of the ink.

According to the Ink cartridge of the present invention are the webs of the equilibrium member and of the detection target portion determined by the pivot member. Therefore, the state of the residual amount of the ink contained in the ink tank can be is displayed without being affected by the error, such as the Surface tension of the ink, for example, at the Inner wall surface of the ink container adheres, if the ink is reduced, excessively to be influenced.

In the ink cartridge of the present invention, a regulating member ( 35A ), which is a rotation of the pivoting member ( 80 ) in the first direction, in the ink tank ( 11 ) and the acquisition target section ( 34A ) can be positioned at a detection position when the pivoting member ( 80 ) by the regulatory member ( 35A ) is regulated. Accordingly, when the ink having an amount not less than a predetermined amount is stored in the ink container, it is possible to reliably stop the detection target portion at the detection position.

In the ink cartridge of the present invention, the balance member (FIG. 33A ) at a position lower than that of the detection target section (FIG. 34A ) is positioned when the detection target section ( 34A ) is positioned at the detection position. Accordingly, when the ink contained in the ink container is reduced, the detection target portion protrudes from the ink liquid surface earlier than the equilibrium member. Therefore, the pivotal member starts the rotation in the second direction after the ink adhering to the detection target portion flows down. Therefore, it is possible to reduce the influence of the surface tension of the ink on the detection target portion when the pivot member starts rotation in the second direction.

In the ink cartridge of the present invention, the detection target portion (FIG. 34A ) be positioned at a non-detection position when the pivot member ( 80 ) is rotated in the second direction. Accordingly, it is possible to distinguish and recognize the state in which the amount of the ink is reduced as compared with the predetermined amount and the state in which the ink remains in an amount not less than the predetermined amount ,

In the ink cartridge of the present Er As a result, the rotational force in the first direction may have a size substantially the same as that of the rotational force in the second direction. Accordingly, the rotational forces to cause the rotation in the first direction and the second direction can be exerted on the pivot member in a well-balanced manner. Therefore, it is possible to display the state of the residual amount of the ink in the ink tank without being excessively influenced by both the surface tension of the ink and the disturbance caused by, for example, the increase in the viscosity of the ink.

In the ink cartridge of the present invention, the connector ( 32A ) in the ink tank ( 11 ), so that a width of a projection plane formed by vertically projecting the link ( 32A ) is obtained on the ink liquid surface in a state of use of the ink cartridge ( 1A ) is the narrowest. Accordingly, it is possible to reduce the contact area between the connector and the ink liquid surface when the connector protrudes from the ink liquid surface. Therefore, it is possible to reduce the influence of the surface tension of the ink on the connector.

In the ink cartridge of the present invention, the connector ( 32A ) in the ink tank ( 11 ), so that a side wall surface of the connecting member ( 32A ) opposite to the ink liquid surface slits obliquely with respect to the ink liquid surface. Accordingly, it is possible to further reduce the contact area between the connector and the ink liquid surface when the connector projects from the ink liquid surface. Therefore, it is possible to reduce the influence of the surface tension of the ink on the connector.

In the ink cartridge of the present invention, at least one projection ( 32AA ) projecting toward the ink liquid surface and extending in an extending direction of the connecting member (Fig. 32A ), on the sidewall surface of the connecting member ( 32A ) opposite to the ink liquid surface. Accordingly, it is possible to further reduce the contact area between the connector and the ink liquid surface when the connector projects from the ink liquid surface. Therefore, it is possible to further reduce the influence of the surface tension of the ink on the connector.

In the ink cartridge of the present invention, the balance member (FIG. 33A ) may be a float formed of a resin and having a specific gravity smaller than that of the light-transmitting ink. Accordingly, it is possible to increase the ratio of the buoyancy force generated at the balance member with respect to the gravity generated at the balance member. Therefore, it is possible to obtain the sufficiently large rotational force in the first direction.

In the ink cartridge of the present invention, the balance member (FIG. 33A ) may be formed of polypropylene. Accordingly, the specific gravity of polypropylene is 0.9, and the specific gravity is generally lighter than that of the light-transmitting ink. Therefore, when polypropylene is used as the balance member, it is possible to increase the buoyancy force generated at the balance member.

In the ink cartridge of the present invention, the balance member (FIG. 33A ) a tightly closed room ( 36A ) in the same. Accordingly, even if a resin having a specific gravity larger than that of the ink is used, it is possible to reduce the specific gravity of the entire balance member. Further, it is possible to form the balance member and the pivot member with an identical material.

If the equilibrium member has the tightly closed space in it, the equilibrium member ( 33A ) with a housing ( 33AA ) and a closure ( 33 ba ), which are integrally formed, the closure ( 33 ba ) can at an opening of the housing ( 33AA ), and an interior of the housing ( 33AA ) can be tightly closed to the tightly closed space ( 36A ) to build. Accordingly, it is possible to easily and inexpensively produce the pivot member.

In the ink cartridge of the present invention, a volume ratio K of the sealed space (FIG. 36A ) with respect to a volume of the equilibrium member ( 33A ) are represented by the following expression: (2x-Y) / 2x-0.1 <K <(2x-Y) / 2x + 0.1 wherein X represents the specific gravity of the resin and Y represents the specific gravity of the light-transmitting ink. Accordingly, it is possible to determine the rotational forces in the first direction and the second direction exerted on the pivot member in a well-balanced manner.

In the ink cartridge of the present Er can be a volume ratio K of the tightly closed space ( 36A ) with respect to a volume of the equilibrium member ( 33A ) not less than 0.3 and not more than 0.5. The preferable range of the ratio K is a preferable range to be obtained when a preferred resin having a specific gravity of 0.9 is used as a material for forming the balance member, and a preferred ink having a specific gravity of 1.07 is used. When the volume ratio K of the tightly closed space with respect to the volume of the balance member is set within the range as described above, it is possible for the rotational forces in the first direction and the second direction exerted on the pivot member to be well balanced Way to determine.

In the ink cartridge of the present invention, the detection target portion (FIG. 34A ) have a lack of transparency. Accordingly, an optical sensor may be used as a detector for detecting the deflection of the detection target portion.

In the ink cartridge of the present invention, the detection target portion (FIG. 34A ) on the connecting link ( 32A ), so that a width of a projection plane obtained by vertically projecting the detection target portion (FIG. 34A ) is obtained on the ink liquid surface in a state of use of the ink cartridge ( 1A ) is the narrowest. Accordingly, it is possible to reduce the contact area between the detection target portion and the ink liquid surface when the detection target portion protrudes from the liquid surface of the ink. Therefore, the influence of the surface tension of the ink is further reduced, and hence it is possible to more easily rotate the pivot member.

In the ink cartridge of the present invention, the ink cartridge ( 103 ) a regulation surface ( 156 ) regulating a deflection of the pivot member; the ink tank ( 131 ) can be a downwardly inclined inner surface ( 134b ) extending in a direction inclined downward with respect to the ink surface; the pivoting member can with a support portion ( 160a ) capable of selectively depending on a position of the pivot member at a position to be on the regulation surface ( 156 ), and a position where it is from the regulation surface ( 156 ) is to be located; and a lead ( 159 ), which during a movement of the support section ( 160a ) between the separate position and the support position always the downwardly inclined inner surface ( 134b ) is opposite, can at a part of the pivot member of the downwardly inclined inner surface ( 134b ) is opposite, be formed.

According to the Ink cartridge of the present invention, the distance between the pivot member and the downwardly inclined inner surface the projection, which at the part of the pivoting member, which is the downwards inclined inner surface opposite, formed is maintained. Therefore it is possible the liability between the pivot member and the downwardly inclined inner surface, which is opposite to it, due to the surface tension the ink and the hindrance of the problem-free deflection effect to avoid the pivoting member. Therefore, the pivot member is easy moves when the remaining amount of ink is changed, and therefore, it is possible the fact that the residual amount of ink in the ink container arrives at a predetermined amount, to capture with a little mistake.

In the ink cartridge of the present invention, the ink tank ( 131 ) with a recess ( 134a ), the two of the downwardly inclined inner surfaces ( 134b ), which are opposite each other, and which are defined by the two opposite downwardly inclined inner surfaces (FIG. 134a ) is defined; at least a portion of the pivot member may be interposed between the two downwardly inclined inner surfaces (FIG. 134b ) located in the recess ( 134a ) are arranged opposite one another; and the lead ( 159 ) of a part of the pivoting member, one of the two downwardly inclined inner surfaces ( 134b ) to each of the downwardly inclined inner surfaces ( 134b ) protrude. Accordingly, it is possible to narrow the width of the recess by shortening the distance between the pivot member and the downwardly inclined inner surface of the recess formed in the ink tank. Therefore, it is easy to detect the deflection of the pivot member from the exterior of the recess.

In the ink cartridge of the present invention, the pivot member having a thin plate-shaped portion (FIG. 160 ) formed between the two downwardly inclined inner surfaces ( 134b ), which are in the recess ( 134a ) is arranged, when the support section ( 160a ) is located at the resting position, and the projection ( 159 ) can from the thin plate-shaped section ( 160 ) protrude. Accordingly, it is possible to make the width of the recess formed for the ink container even narrower.

In the ink cartridge of the present invention, a rib ( 158 ) of each of parts of the two downwardly inclined inner surfaces ( 134b ), which are opposite to the pivot member, project toward the pivot member. Accordingly The ink remaining between the downwardly inclined inner surface and the pivot member falls down the rib along the rib. Therefore, it is possible to further avoid the adhesion between the downwardly inclined inner surface and the pivot member caused by the surface tension of the ink.

In the ink cartridge of the present invention, the rib (FIG. 158 ) may be provided continuously along a deflection path of the pivot member. Accordingly, the ink remaining between the downwardly inclined inner surface and the pivot member falls more efficiently downwards more efficiently.

In the ink cartridge of the present invention, the outermost part of the recess (FIG. 159 ) from a curved surface that leads to the downwardly inclined inner surface ( 134b ), be constructed. With this arrangement, the projection of the pivot member and the downwardly inclined inner surface make a point-to-point contact with each other, and the contact area between the projection of the pivot member and the downwardly inclined inner surface is reduced. Therefore, the swivel member is hardly affected by the surface tension of the ink, and it is possible to easily deflect the swivel member.

In the ink cartridge of the present invention, the support portion (FIG. 160a ) may be a columnar protrusion extending along the ink surface, and a wall (FIG. 157 ) may be provided adjacently in an upright manner which is the regulatory surface ( 156 ) in the extension direction of the support section (FIG. 160a ) cuts when the support section ( 160a ) at least on the regulation surface ( 156 ) rests. Accordingly, the support portion of the pivot member and the regulation surface make line-to-line contact with each other, and the contact area between the support portion and the regulation surface is reduced. Therefore, the pad portion and the regulating surface hardly adhere to each other by the surface tension of the ink. When the wall which intersects the regulation surface is provided on the regulation surface in the upright manner, the ink stored or accumulated on the regulation surface becomes affected by the capillary force of the curved part which exists at the boundary between the regulation surface and the surface Wall surface is formed, sucked off and removed. Therefore, it is possible to further suppress the adhesion between the rest portion and the regulation surface by the surface tension of the ink.

In the ink cartridge of the present invention, the regulation surface ( 156 ) may be an inclined surface that intersects the ink surface. Therefore, the ink accumulated on the regulation surface flows downward along the inclination of the regulation surface. Therefore, the ink is less likely to accumulate on the regulation surface.

In addition, in the ink cartridge of the present invention, the pivot member in the ink tank (in FIG. 131 ) is rotatable about the center of an axis perpendicular to the direction of deflection of the ink surface when the ink is used, depending on the increase / decrease in the amount of the ink contained in the ink tank (FIG. 131 ) is stored. Accordingly, when the pivot member is rotated, the path of the pivot member is stabilized. Therefore, the downwardly inclined inner surface and the pivot member hardly adhere to each other by the surface tension of the ink.

In the ink cartridge of the present invention, the protrusion ( 159 ) and the downwardly inclined inner surface ( 134b ) facing the same, may be formed near the end of the pivot member. Accordingly, the adhesion of the pivot member to the downwardly inclined inner surface, which would otherwise be caused by the surface tension of the ink, can be reliably prevented.

In the ink cartridge of the present invention, the protrusion ( 159B ) and the downwardly inclined inner surface ( 134b ) facing the same, may be formed near the axis of the pivot member. When the protrusion is formed near the rotation axis of the pivot member, it is possible to narrow the range of the deflection of the protrusion when the pivot member is rotated. It is possible to reduce the downwardly inclined inner surface facing the projection of the pivot member.

In addition, in the ink cartridge of the present invention, the ink tank ( 131 ) a regulatory surface ( 156 ) which is substantially perpendicular to a direction of deflection of the ink surface caused by use of the ink and a downwardly inclined inner surface (FIG. 134b ) projecting in a direction downwardly inclined with respect to the regulation surface from one end of the regulation surface ( 156 ); the pivoting member can with a support portion ( 160a ) selectively depending on a position of the pivot member at a position to be on the regulation surface ( 156 ), and a position where it is from the regulation surface ( 156 ) is separated; a recess ( 134a ), by two of the downwardly inclined inner surfaces ( 134b ), which are opposed to each other, can be defined on an inner wall surface of the ink tank (FIG. 131 ) be formed; at least a portion of the pivot member may be interposed between the two downwardly inclined inner surfaces (FIG. 134b ), which are located in the recess opposite, be arranged; a lead ( 159 ), which during a movement of the support section ( 160a ) between the separate position and the support position always each of the downwardly inclined inner surfaces ( 134b ) is opposite, of each of parts of the pivot member, the downwardly inclined inner surfaces ( 134b ) to each of the downwardly sloping inner surfaces (FIG. 134b ) project; and a rib ( 158 ) of each of parts of the two downwardly sloping inner surfaces ( 134b ), which are opposite to the pivot member, project toward the pivot member.

In the ink cartridge of the present invention, the ink tank ( 131 ) a regulatory surface ( 156 ), which regulates a deflection of the pivoting member, and a wall surface ( 169 ) extending from one end of the regulation surface ( 156 extending down to the ink liquid surface; the pivoting member can with a support portion ( 160a ) selectively depending on a position of the pivot member at a position to be on the regulation surface ( 156 ) and a position where it is separated from the regulation surface; and a rib ( 157 ), via the regulation surface ( 156 ) and the wall surface ( 169 ), of both the regulatory surface ( 156 ) as well as the wall surface ( 169 ) protrude.

If the arrangement adopted as described above is, the ink falling on the regulation surface drops of the ink tank remains along the Rib downwards. Therefore, the support portion of the pivot member adhere and the regulating surface of the ink container by the surface tension of the ink hardly together. Therefore, when the pivot member in accordance with the amount of ink remaining is changed, the pivot member easily turned. It is possible the fact that the amount of ink remaining in the ink cartridge at a predetermined Quantity arrives, with a small mistake to capture.

In the ink cartridge of the present invention, the rib (FIG. 157 ), which on one side, the support section ( 160a ) is arranged to have a side surface which is compared with a direction perpendicular to the regulation surface (FIG. 156 ) and the wall surface ( 169 ), or the vertical direction under the condition that the position of abutment between the abutment portion (FIG. 160a ) and the regulation surface ( 156 ) is located on an inner side, is inclined in an outer direction. Accordingly, the suction force (hereinafter also referred to as "capillary force") caused by the capillary action at the boundary between the regulation surface and the rib is reduced. Therefore, the ink at the border is hardly stored or accumulated.

In the ink cartridge of the present invention, the rib (FIG. 157 ) continuously over a region from one end to the other end of the regulation surface ( 156 ) be provided. Accordingly, the ink left on the regulation surface tends to fall down along the rib.

In the ink cartridge of the present invention, the rib (FIG. 157 ) continuously over a region from an upper end to a lower end of the wall surface ( 169 ) be provided. Accordingly, the ink left on the downwardly inclined inner surface tends to fall down along the rib.

In the ink cartridge of the present invention, a curve that passes over the rib (FIG. 157 ) and the regulation surface ( 156 ) near the border between the rib ( 157 ) and the regulation surface ( 156 ) has a curvature smaller than a curvature of a curve passing over the rib ( 157 ) and the wall surface ( 169 ) near the border between the rib ( 157 ) and the wall surface ( 169 ) enough. Accordingly, the capillary force obtained at the boundary between the rib and the wall surface is larger than the capillary force obtained at the boundary between the rib and the regulation surface. Therefore, the ink left at the boundary between the regulation surface and the rib tends to fall down along the rib.

In the ink cartridge of the present invention, the regulation surface ( 156 ) may be an inclined surface that intersects the ink surface. Accordingly, the ink left on the regulation surface tends to fall more easily downward.

In the ink cartridge of the present invention, the ink tank ( 131 ) a downwardly inclined inner surface ( 134b ) extending in a direction inclined downward with respect to a surface which is perpendicular to a direction of deflection of the ink surface caused by use of the ink; and a rib ( 158 ) may consist of a part of the downwardly inclined inner surface ( 134b ) facing the pivot member, toward the pivot protruding limb.

If the arrangement adopted as described above is the ink tending at the downwardly inclined inner surface the ink tank, which is opposite to the pivot member, remains behind, to fall down the rib. Therefore stick the pivot member and the downwardly inclined inner surface, which is opposite the pivot member, by the surface tension the ink hardly together. Accordingly, the pivot member easily turned when the pivot member in accordance is rotated with the change of the remaining amount of the ink. It is possible the fact that the ink residue in the ink cartridge is substantially zero, with a small one To detect errors.

In the ink cartridge of the present invention, the rib (FIG. 158 ) may be provided continuously along a deflection path of the pivot member. Accordingly, it is possible to efficiently discharge the ink stored or accumulated between the pivot member and the downwardly inclined inner surface facing the same.

In the ink cartridge of the present invention, a recess ( 134a ), in which the two downwardly inclined inner surfaces ( 134b ) are opposed to each other on the inner wall of the ink tank ( 131 ), at least a part of the pivoting member can between the two downwardly inclined inner surfaces ( 134b ) located in the recess ( 134a ), and the rib (FIG. 158 ) can be defined by the two downwardly inclined inner surfaces ( 134b ) each project toward the pivot member. Accordingly, it is possible to shorten the distance between the pivot member and the downwardly inclined inner surface of the recess formed in the ink tank. Therefore, it is easy to detect the deflection of the pivot member from the exterior of the recess.

In the ink cartridge of the present invention, a curve close to the boundary between the rib (FIG. 158 ) and the upper end of the downwardly inclined inner surface ( 134b ) over the rib ( 158 ) and the downwardly inclined inner surface ( 134b ), have a curvature that is smaller than a curvature of a curve that is near the boundary between the rib ( 158 ) and the lower end of the downwardly inclined inner surface ( 134b ) over the rib ( 158 ) and the downwardly inclined inner surface ( 134b ) enough. Accordingly, the capillary force obtained at the boundary between the lower end of the rib and the downwardly inclined inner surface facing the pivot member is greater than the capillary force that exists at the boundary between the upper end of the rib and the downwardly inclined inner surface. which is opposite to the pivot member, is obtained. Therefore, the ink remaining at the boundary between the rib and the downwardly inclined inner surface opposite to the pivot member tends to fall down along the rib.

In the ink cartridge of the present invention, the pivot member may have a thin plate-shaped portion (FIG. 160 ), the two downwardly inclined inner surfaces ( 134b ) is opposite to the recess ( 134a ) to build. Accordingly, it is possible to further shorten the distance between the pivot member and the downwardly inclined inner surface of the recess formed in the ink tank. Therefore, it is easier to detect the deflection of the pivot member from the exterior of the recess.

In the ink cartridge of the present invention, the pivot member in the ink tank (FIG. 131 ) is rotatable about the center of an axis perpendicular to the direction of deflection of the ink surface when the ink is used, depending on the increase / decrease in the amount of ink contained in the ink tank (FIG. 131 ) is stored. Accordingly, when the pivot member is rotated, the path of the pivot member is stabilized. Therefore, the pivot member and the downwardly inclined inner surface facing the same hardly adhere to each other by the surface tension of the ink.

In the ink cartridge of the present invention, the ink tank ( 131 ) a regulatory surface ( 156 ) which is substantially perpendicular to a direction of deflection of the ink surface caused by use of the ink and a wall surface (FIG. 169 ) and a downwardly inclined inner surface ( 134b ) extending from respective ends of the regulation surface ( 156 ) to the regulation surface ( 156 ) downwards; the pivoting member may be provided with a columnar support section ( 160a ) which extends in a direction perpendicular to the direction of a deflection and which depends on a position of the pivot member at a position to on the regulatory surface ( 156 ) and a position where it is separated from it; a first rib ( 157 ) can from the regulation surface ( 156 ) and the wall surface ( 169 ), the first rib ( 157 ) over both the wall surface ( 169 ) as well as the regulation surface ( 156 ) and adjacent to the support section ( 160a ) is arranged when the support section ( 160a ) is in the resting position; a recess ( 134a ) caused by a pair of downwardly inclined inner surfaces ( 134b ), the Opposite, is defined, can on an inner wall of the ink tank ( 131 ) be formed; and at least a portion of the pivot member may be disposed between the downwardly sloping interior surfaces (FIG. 134b ) located in the recess ( 134a ), and a second rib ( 158 ) of each of parts of the downwardly inclined inner surfaces ( 134b ), which are opposite to the pivot member, project toward the pivot member.

According to a second aspect of the present invention, there is provided an ink jet printer having a mounting portion (Fig. 70 ), in which the ink cartridge according to the first aspect is incorporated, to print on a medium with an ink discharged from the ink cartridge ( 1 ) inserted in the installation section ( 70 ) is installed, perform a recording; where a detector ( 21 ) having a detection target section ( 34 ) of the ink cartridge ( 1 ) inserted in the installation section ( 70 ) is detected, is provided at a position at which the detection target section ( 34 ) positioned at a detection position is detectable.

According to the Inkjet printers of the present invention are the orbits of a Rotation of the balance member and the detection target portion determined when the pivot member is rotated. Therefore, it is possible to correctly detect the amount of ink with the detector without passing through the disturbance, for example, by the surface tension the ink is caused excessively to be influenced.

In the ink-jet printer of the present invention, the tinfoil jet printer may further comprise a judgment unit (FIG. 62 ), the states of the ink cartridge ( 1 ) and the inkjet printer ( 60 ) according to a result of detection by the detector ( 21 ) is assessed; wherein a judgment of a state in which the ink cartridge ( 1 ) inserted in the installation section ( 70 ) loaded with a sufficient amount of the ink is loaded by the evaluation unit ( 62 ) is performed when the detector ( 21 ) the detection target section ( 34 ) while judging any of a state in which the ink contained in the ink cartridge ( 1 ) inserted in the installation section ( 70 ) is included, is reduced, and a state in which the ink cartridge ( 1 ) not in the installation section ( 70 ) is carried out when the detector ( 21 ) the detection target section ( 34 ) is not recorded. Accordingly, it is possible to judge with a detector the state of the residual amount of the ink in the ink cartridge and the presence or absence of the installation of the ink cartridge.

In the ink jet printer of the present invention, the detector ( 21 ) be a sensor of a light-transmitting type. Accordingly, it is possible to use a low-cost sensor of a light-transmitting type. Therefore, it is possible to realize the low cost of the ink jet printer.

According to a third aspect of the present invention, there is provided an ink cartridge comprising an ink tank ( 11 . 201 ) in which an ink is stored; a float ( 33 . 202 ) floating on the ink; a carrier member ( 32 . 203 ) pivotally supporting the float so that the float does not make contact with an inner surface of the ink container; a detection target section ( 34A ) attached to the support member ( 32 . 203 ) or the float is provided; and a regulatory member ( 35A ), which regulates the support member so that the float is positioned in the ink when an amount of the ink contained in the ink container is not less than a predetermined amount. In the case of this ink cartridge, when a predetermined amount of the ink exists in the ink tank, the float is held in the ink with the aid of the regulating member. If the ink is less than the predetermined amount, then the float floats on the ink surface, and the float also performs pivotal movement as the ink surface is lowered. Therefore, it is possible to detect the residual amount of the ink with the aid of the detection target portion provided on the support member or the float. In the case of this ink cartridge, the support member pivotally supports the float without contact of the float with the inner surface of the ink container. Therefore, the float is not restricted by the inner surface of the container by the surface tension of the ink. If the ink is not less than a predetermined amount, the float is held in the ink. Therefore, the float is not affected by the surface tension of the ink. In order to allow the swivel motion of the swimmer to more correctly follow the residual amount of the ink, it is appropriate that the buoyant force and gravity of the swimmer be adjusted or controlled as in the first aspect of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

1 FIG. 12 is a schematic diagram illustrating an ink jet printer with an ink cartridge according to a first embodiment. FIG.

2 shows a sectional view taken along a line II-II, in 1 shown is the ink cartridge in 1 is pictured represents.

3 shows a sectional view taken along a line III-III, in 2 shown is a swimmer who is in 2 is pictured represents.

4 FIG. 11 is a sectional view illustrating a situation in which the amount of ink in an ink tank of the ink cartridge shown in FIG 1 is pictured, is low.

5 shows the principle of rotation of a pivot member, which in 1 is shown.

6 shows the relationship between the ratio of air in the float, which in 1 and the buoyancy and gravity acting on the float.

7A and 7B show sectional views illustrating an ink cartridge according to a second embodiment.

8th shows a sectional view taken along a line VIII-VIII, which in 7 is shown.

9 shows a development that the pivoting member, which in 7 is shown.

10 shows sectional views along a line XX, which in 9 is shown.

11 shows a schematic arrangement of an ink-jet printer according to a third embodiment.

12 shows an ink cartridge which is in 11 is shown, where

12A a top view shows 12B a link page view shows and 12C shows a bottom view.

13 FIG. 11 is a perspective view showing the ink cartridge shown in FIG 11 is pictured, seen from a downward position.

14 shows a sectional view taken along a line IV-IV, which in 12B is shown.

15 shows a perspective view with a cross section along a line VV, which in 12A is shown.

16 shows a top view with a cross section along the line VV, which in 12A is shown.

17 shows a front view with a cross section along the line VV, which in 12A is shown.

18A shows a sectional view taken along a line VIIIA-VIIIA, in 16 is shown

18B shows a sectional view taken along a line VIIIB-VIIIB, which in 16 is shown, and

18C shows a sectional view taken along a line VIIIC-VIIIC, which in 17 is shown.

19 shows sectional views showing an ink supply valve, the in 14 is depicted, represent 19A shows the state in which the valve is closed, and 19B shows the state in which the valve is open.

20 shows a perspective view showing a valve plug in 15 is pictured represents.

21 FIG. 12 is a flow chart showing a built-in state judging process in attaching / detaching the ink cartridge shown in FIG 11 is pictured represents.

22 Fig. 10 is an enlarged view showing a partial cross section of an ink cartridge according to a fourth embodiment.

23 Fig. 10 is a perspective view showing a partial cross section of an ink cartridge according to a fifth embodiment.

24 schematically shows an example of the ink cartridge of the present invention, wherein 24A shows a situation in which the ink is sufficiently charged, and 24B shows a situation in which the ink is reduced.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

1st embodiment

One first embodiment according to the present invention The invention will be explained with reference to the drawings.

1 Fig. 10 is a partial schematic view illustrating an ink jet printer with an ink cartridge according to the first embodiment. The ink cartridge 1 , in the 1 shows a cross-sectional structure of the ink cartridge 1 as they go along a line II, which in 2 shown is cut. An arrow 71 who in 1 is shown, indicates the flow of the ink, and an arrow 72 indicates the flow of atmospheric air. 2 shows a sectional view showing the ink cartridge 1 represents along a line II-II, which in 1 shown is recorded. 3 shows a sectional view showing a float 33 represents that along a line III-III, which is in 2 shown is recorded.

As in 1 shown includes the inkjet printer 60 an inkjet head 5 which discharges the light-transmitting ink toward the recording paper P, an ink cartridge 1 containing the ink (I in the drawing) leading to the inkjet head 5 to unload, stores, a cart 6 that moves back and forth linearly and the inkjet head 5 in a certain direction (a direction perpendicular to the surface of the paper) along a guide 7 moves, a transport mechanism 8th containing the recording paper P in a direction perpendicular to the direction of movement of the ink-jet head 5 parallel to the ink discharge surface of the ink jet head 5 transported, a cleaning unit 9 that the air in the inkjet head 5 contained, and aspirates the ink with a high viscosity, a sensor (detector) 21 That's the amount of ink in the ink cartridge 1 is included, and the presence or absence of the ink cartridge 1 detected, and a control unit 22 that controls the previous one.

The inkjet head 5 has the ink discharge surface on which a large number of nozzles (not shown) for discharging the ink are formed. The inkjet head 5 is through the control unit 22 controlled so that the ink coming from an ink supply tube 4 is supplied, is discharged from the respective nozzles. As in 1 shown has the ink supply hose 4 an end of that with the inkjet head 5 connected, and the other end, with an ink supply pipe 41 connected is. As in 1 shown is the ink supply tube 41 a hose or pipe with a tapered shape that matches the ink cartridge 1 to connect. A plurality of ink supply openings 42 are formed at parts of a closed extreme end, so that the ink supply openings 42 are arranged in the circumferential direction on the outer wall. An ink flow passage 43 inside the tube communicates through the ink inlet openings 42 with the exterior.

The ink cartridge 1 is a substantially rectangular parallelepiped-shaped housing formed of a light-transmitting synthetic resin. As in 1 shown includes the ink cartridge 1 an ink tank 11 storing the ink (I in the drawing), an ink drain passage 12 , which penetrates through a pack as described below 17 is provided to the ink in the ink tank 11 is stored to allow to the exterior of the ink cartridge 1 to drain, an atmospheric air flow passage 13 that allows the atmospheric air into the ink container 11 can flow, a connection 14 holding the ink tank 11 and the ink supply pipe 41 connects and the the ink supply pipe 41 in the ink drainage passage 12 holds, and a shutter mechanism 30 (which includes a pivot member). The ink cartridge 1 is removable in a mounting section 70 of the inkjet printer 60 built-in.

As in 1 shown is the ink tank 11 an ink-storing chamber passing through the inner wall of the ink cartridge 1 is defined. The ink tank 11 includes an ink drain port 15 that allows the ink to be in the ink tank 11 is stored to the ink drain passage 12 can drain, and an atmospheric air inlet 16 , which allows the atmospheric air to flow (arrow 72 who in 1 shown) when the ink is out of the ink drain port 15 flows. As in 1 shown has the ink cartridge 1 of the first embodiment, the ink discharge port 15 located at the bottom surface of the ink tank 11 is provided. The atmospheric air inlet 16 is at the top surface of the ink tank 11 intended. The ink tank 11 communicates through the ink drain port 15 with the ink drain passage 12 , Furthermore, the ink tank communicates 11 through the atmospheric air inlet 16 with the atmospheric air flow passage 13 ,

As in 2 are shown, are projections 51 leading to the interior of the ink tank 11 protrude and extend from the bottom surface of the ink tank 11 to positions near the center in the height direction of the ink tank 11 extend, on an inner side wall of the ink tank 11 educated. As in 2 shown is a recess 52 coming from the inside of the ink tank 11 is concave and is in the height direction of the ink tank 11 extends, near the middle of bottom walls 51a the projections 51 educated. The recess 52 has an interior 52a that with the interior of the ink tank 11 communicates and in which the ink can exist.

As in 1 shown is the ink drain passage 12 at a lower part of the ink tank 11 educated. The ink drain passage 12 communicates through the ink drain port 15 with the ink tank 11 , As in 1 shown is the atmosphere air inflow passage 13 at an upper part of the ink tank 11 educated. The atmosphere air inflow passage 13 communicates through the atmospheric air inlet 16 with the ink tank 11 , and communicates via an inflow opening, on one side, that of the atmospheric air inlet 16 is disposed opposite to the outside of the ink tank 11 , In a condition where the ink cartridge 1 is not used, the inflow opening, which is on the side of the atmospheric air inlet 16 the atmospheric air flow passage 13 is opposite, arranged, closed, so that the atmospheres do not vent through the atmospheric air inlet passage 13 in the ink tank 11 flows.

The connection 14 connects the ink tank 11 and the ink supply pipe 41 , The connection 14 includes a pack 17 in the room, passing through the inner wall of the ink cartridge 1 is partitioned, arranged, and an insertion hole 18 that under the pack 17 is formed. The package 17 is formed of an elastic member composed of a bendable resin. The ink drain passage 12 is in the pack 17 educated. When the ink supply pipe 41 not in the pack 17 is introduced, is the ink drain passage 12 by the elastic force of the pack 17 locked. The introduction hole 18 is a circular hole that passes through the bottom surface of the ink cartridge 1 is formed. The introduction hole 18 serves as an introduction port for the ink supply pipe 41 if the ink tank 11 with the ink supply pipe 41 is connected.

The method for connecting the ink tank 11 and the ink supply pipe 41 is the following. First, the ink supply tube 41 in the insertion hole 18 the connection 14 introduced. Subsequently, the ink supply tube 41 at the time when the outermost end of the ink supply tube 41 that in the insertion hole 18 is introduced at the pack 17 arrives, continue against the pack 17 pressed, and the pack 17 is through the ink supply tube 41 pierced, wherein the extreme end has the shape of a tapered needle. Subsequently, the ink supply tube 41 continue against the pack 17 pressed, and the ink supply pipe 41 Penetrates the ink drain passage 12 for the pack 17 is formed. Finally, the ink supply tube becomes 41 Continue to press until the ink inlet opening 42 at the extreme end of the ink supply tube 41 is formed at the inside of the ink container 11 arrives. So that's the connection between the ink tank 11 and the ink supply pipe 41 completed. Accordingly, the ink flowing in the ink tank flows 11 is stored, through the ink supply port 42 in the ink flow passage 43 inside the tube of the ink supply tube 41 (Arrow 71 who in 1 is shown).

The iris mechanism 30 is based on the amount of ink in the ink tank 11 stored, powered. The iris mechanism 30 is at the bottom of the ink tank 11 arranged. As in 1 shown includes the aperture mechanism 30 a support stand 31 , a lever (a link) 32 , a float (an equilibrium member) 33 that at one end of the lever 32 is disposed an aperture (a detection target portion) 34 at the other end of the lever 32 is arranged, and a regulatory member 35 , In the first embodiment, the pivot member is out of the lever 32 , the swimmer 33 and the aperture 34 built up.

As in 1 and 2 shown is the support stand 31 composed of a pair of plate members with trapezoidal side surfaces. The carrier stand 31 is near the center of the bottom of the ink tank 11 attached. The lever 32 is a member with a thin plate shape extending in a certain direction. As in 1 shown is the lever 32 worn, so the lever 32 between the pair of plate members for constructing the carrier stand 31 is arranged at the middle part in the direction of extent. As in 1 shown is the lever 32 carried and arranged so that the extension direction of the lever 32 perpendicular to the bottom wall 51a of the projection 51 of the ink tank 11 is when the ink is in the ink tank 11 is sufficiently stored. Further, the lever 32 on the support stand 31 around the fulcrum, where the lever 32 on the support stand 31 worn, pivotally supported. The lever 32 is on the support stand 31 worn so that the width of the projection plane of the lever 32 is narrowest in the liquid surface of the ink.

As in 1 shown is the float 33 at the end of the lever 32 formed on the side of the side of the side of the ink tank 11 that with the recess 52 is formed opposite. The swimmer 33 is a member having a cylindrical shape made of a polyoxymethylene resin. The swimmer 33 compared with the aperture 34 an enormous volume. As in 3 shown is a tightly closed space 36 , which is filled with air, in the float 33 educated. Accordingly, the specific gravity of the entire float 33 smaller than the specific gravity of the ink. Therefore, as in 1 shown, then, if a sufficient amount of the ink in the ink container 11 is stored, and the entire float 33 positioned in the ink, the buoyancy force on the float 33 is generated increases. However, if the amount of ink in the ink tank 11 is included, is small, and at least part of the float 33 protrudes from the ink liquid surface, then the buoyancy force on the float 33 is reduced (see 5 ).

As in 1 shown is the aperture 34 at the end of the lever 32 on the side, the side on which the float 33 is arranged, opposite, formed. The aperture 34 is a thin plate-shaped member that is not transparent and substantially rectangular. The aperture 34 is arranged so that the aperture 34 in the interior 52a the recess 52 attached to the sidewall of the inks container 11 is formed, moved (turned) when the lever 32 makes the pivoting movement. More specifically, as in 1 shown when a sufficient amount of the ink in the ink tank 11 is stored and the entire float 33 positioned in the ink, the float 33 then moved up toward the ink liquid surface, and the lever 32 becomes in the direction clockwise (the first direction) in 1 rotated, because the buoyancy force on the float 33 works, is greater than gravity. Accordingly, the aperture 34 at the detection position (the position that the sensor 21 opposite) in the vicinity of the bottom of the recess 52 of the ink tank 11 arranged. In this situation, as in 1 shown the rotational movement of the lever 32 in the first direction through the regulatory member 35 as described below, so that the aperture is not positioned at a position lower than the detection position. On the other hand, if the amount of ink in the ink tank 11 is included, reduced, and part of the float 33 protrudes from the liquid surface of the ink, then the float 33 as in 4 shown toward the bottom surface of the ink container 11 moved down, and the lever 32 becomes in the counterclockwise direction (in the second direction) in 1 because of gravity, because of the swimmer 33 acts, is greater than the buoyancy force. Accordingly, as in 4 shown the aperture 34 at the non-detection position (the position corresponding to the sensor 21 not opposite) in the vicinity of the upper part of the recess 52 of the ink tank 11 arranged.

As in 1 shown is the regulatory element 35 a plate-shaped member formed to extend from the bottom of the ink container 11 to extend upward. The regulatory element 35 regulates the rotation of the lever 32 in the specific direction (the first direction), so that the aperture 34 is not positioned at a position lower than the detection position when a sufficient amount of the ink in the ink tank 11 is stored and the entire float 33 is positioned in the ink liquid. More specifically, as in 1 shown the rotation of the lever 32 in the first direction (the clockwise direction in 1 ), and the aperture 34 By allowing that to be the upper end of the regulator 35 on the bottom surface of the lever 32 rests when the entire float 33 is positioned in the ink liquid, located at the detection position.

As in 1 shown includes the cleaning unit 9 a cleaning closure 10 at the ink discharge surface of the ink jet head 5 is installed, and a suction pump 10a that sucks the ink. The cleaning unit 9 is at the position corresponding to the inkjet head 5 is opposite, with the recording paper P lying between them. The cleaning unit 9 is movable in the direction to approach or separate with respect to the ink discharge surface of the ink jet head 5 make. Driving the suction pump 10a is through the control unit 22 controlled.

The sensor 21 is an optical sensor of a transmissive type having a light-emitting portion and a light-receiving portion facing each other. As in 2 shown is the sensor 21 arranged so that the recess 52 attached to the sidewall of the ink tank 11 is formed from the exterior of the ink container 11 is disposed between the light-emitting portion and the light-receiving portion. In the first embodiment, the residual amount of the ink in the ink tank becomes 11 and the presence or absence of the installation of the ink cartridge 1 by detecting whether the light transmission between the light-emitting portion and the light-receiving portion of the sensor 21 through the aperture 34 of the iris mechanism 30 blocked or not judged. More specifically, the ink and the housing of the ink cartridge 1 Transmitting light while the aperture 34 of the iris mechanism 34 is not transparent. Therefore, when the aperture 34 at the detection position (the position that the sensor 21 opposite) in the vicinity of the bottom in the recess 52 of the ink tank 11 (the state, as in 1 shown), the light coming from the light-emitting portion of the sensor 21 is emitted through the aperture 34 blocked. If, however, the aperture 34 at the non-detection position (the state that is in 4 is shown), the light coming from the light-emitting portion of the sensor 21 is emitted, picked up by the light-receiving section.

That is, the sensor 21 is operated such that the output of the sensor 21 ON / OFF, depending on whether or not the light emitted from the light-emitting portion is picked up by the light-receiving portion.

The control unit 22 includes a CPU (Central Processing Unit) serving as a calculation processing unit, a ROM (Read Only Memory) in which programs to be executed by the CPU, and Data to be used for the programs are stored, and a RAM (Randgt Access Memory) which temporarily stores data during execution of the program. These components are integrated into one unit, and the CPU, ROM and RAM function as respective functional sections. Accordingly, an ink jet printer 1 controlled. The control unit 22 further comprises functional sections of a drive unit 61 and a judgment unit 62 , The drive unit 61 is provided to drive the respective units, for example the ink jet head 5 , the car 6 and the motor for driving the transport mechanism 8th as well as the suction pump 10a the cleaning unit 9 include, control.

The assessment unit 62 judges the presence or absence of the ink cartridge 1 and the state of the amount of ink contained in the ink tank 11 is included, depending on the detection result of the sensor 21 , Specifically, if the aperture 34 at the detection position (the state as in 1 shown), and the sensor 21 the presence of the aperture 34 captured to output AN, then it is judged that a sufficient amount of the ink is in the ink tank 11 loaded. If the sensor 21 detecting nothing to output OFF, it is judged that any one of the states, ie, the state in which the amount of ink contained in the ink tank 11 is stored, is reduced, and the state in which the ink cartridge 1 not in the installation section 70 is built in, is given.

Next, referring to 1 and 4 an explanation of the operation of the shutter mechanism 30 performed. 4 shows a sectional view of the ink cartridge 1 , which illustrates a situation in which the amount of ink in the ink tank 11 is low. On the other hand shows 1 a sectional view of the ink cartridge 1 , which illustrates a situation in which the amount of ink in the ink tank 11 is great. When the amount of ink in the ink tank 11 as in 1 shown is the entire aperture mechanism 30 in the ink liquid contained in the ink container 11 stored, arranged. In this situation, the whole lever 32 by the combined force of gravity and the buoyant force acting on the float 33 be generated, and the gravity and the buoyant force acting on the panel 34 be generated, the rotational force in the first direction (clockwise direction in 1 and 5 ) exposed. However, as in 1 shown lies the bottom surface part of the lever 32 on the upper end of the regulator 35 of the iris mechanism 30 on, and therefore is the rotation of the lever 32 regulated in the first direction. More precisely, as in 1 shown the aperture 34 regulated, so that the aperture 34 no rotation to a position lower than the detection position of the sensor 21 is doing. Accordingly, when the amount of the ink in the ink container is large, the iris is 34 as in 1 shown arranged at the detection position. If the aperture 34 is located at the detection position in this state, the sensor outputs 21 On off.

On the other hand, as in 4 shown when the amount of ink in the ink tank 11 is reduced when the ink is consumed, the float 33 and the aperture 34 gradually on the ink liquid surface. Accordingly, the buoyancy forces acting on the float 33 and the aperture 34 are generated, gradually reduced and the influence of the gravitational forces acting on the float 33 and the aperture 34 are generated is increased. In this situation, there is gravity on the entire lever 32 affects, the influence of gravity on the swimmer 33 works, increases because of the swimmer 33 compared to the aperture 34 hard. When the amount of ink is reduced to a predetermined amount, there is a state in which the buoyancy force in the clockwise direction is applied to the float 33 is generated, is balanced with the force of gravity in the counterclockwise direction. As the ink continues to be consumed, the buoyancy force on the float is increased 33 acts, further reduced. The combined force described above on the entire lever 32 acts, the rotational force is in the second direction (the counterclockwise direction in 4 and 5 ), and the lever 32 is rotated in the second direction. Accordingly, the lever 32 from the end of the regulatory link 35 separated to move in the direction toward the ink liquid surface, and the shutter 34 will be like in 4 shown moved to the non-detection position. When the residual amount of ink in the ink tank 11 zero approaches, then the buoyancy forces are due to the float 33 and the aperture 34 are generated, zero, and the rotational force in the second direction is further increased. If the aperture 34 is located at the non-detection position, the sensor outputs 21 From from.

Next, referring to 5 and 6 an explanation of details of the principle of rotation of the lever 32 performed. 5 schematically shows the aperture mechanism 30 , 6 shows the relationship between the volume ratio of the air in the float 33 in terms of the volume of the float 33 and the buoyancy and gravity of the float 33 Act. Actually, as in 5 shown the direction of rotation of the lever 32 by the combined force the buoyancy forces and the gravitational forces acting on the right-hand side (on the side of the diaphragm 34 ) and the left-hand part (on the side of the swimmer 33 ), with the limit of the point of carrying through the support stand 31 , However, to simplify the explanation, the description is now under the assumption made that all of the forces acting on the aperture mechanism 30 be exercised on the float 33 Act. That is, in this description, the buoyancy forces and gravitational forces acting on the other constituent parts (the diaphragm 34 and the lever 32 ) as the swimmer 33 act, neglected. Instead, it is considered that the buoyancy forces and the gravitational forces caused by the entire iris mechanism 30 be taken on the float 33 Act. It is believed that the float 33 the effective total volume A and the effective volume B of the tightly closed space 36 has, so the assumption applies as described above. Under this assumption, the rotational forces are the lever 32 turning in the first direction and the second direction, by the buoyancy and the gravity acting on the float 33 act, determined.

When the buoyancy force attached to the float 33 acts, extremely much larger than gravity, the torque in the first direction is on the float 33 exercised considerably. Therefore, when the ink liquid surface is lowered, when the ink is consumed, the float tends to be 33 to be exposed to the influence as well as the surface tension of the ink. In such a case, it is feared that the swimmer 33 does not follow the lowering of the ink liquid surface, and the aperture 34 not moved from the detection position to the non-detection position. On the other hand, if the gravity of the float 33 Extremely much larger than the buoyancy force, the torque in the second direction is on the float 33 exercised considerably. Therefore, when the ink is consumed and reduced, it is feared that the float 33 at the bottom of the ink tank 11 arrives in a state in which a certain amount of the ink in the ink tank 11 lingers, and the aperture 34 moved to the non-detection position.

A:

Gesamtvolumen des Schwimmers 33;

B:

Volumen der in den dicht geschlossenen Raum 36 des Schwimmers 33 geladenen Luft;

X:

Spezifische Dichte des Schwimmers 33;

Y:

Spezifische Dichte der Tinte.

Therefore, it is the detection accuracy for the residual amount of the ink in the ink tank 11 To improve, it is necessary that one of the rotational forces acting in the first and the second direction on the float 33 act, not extremely reduced. It is most desirable that the ratio between the effective volume A of the entire float 33 and the effective volume B of air entering the tightly closed space 36 of the swimmer 33 is loaded, is set so that the rotational forces in the first and second directions are approximately identical to each other. The rotational force F1 in the first direction and the rotational force F2 in the second direction, on the float 33 act are expressed as follows: F1 = AY - (A - B) X (1) F2 = (A - B) X (2)

A:

Total volume of the float 33 ;

B:

Volume of in the tightly closed space 36 of the swimmer 33 charged air;

X:

Specific gravity of the float 33 ;

Y:

Specific density of the ink.

In particular, AY corresponds to the combined buoyancy force on the float 33 acts, and (A - B) X (= F2) corresponds to the combined gravity applied to the float 33 acts. That is, the rotational force F1 in the first direction is expressed as the difference between the combined buoyancy force and the combined gravitational force acting on the float 33 act, expressed. The relationship between the rotational forces F1 and F2 is in 6 shown. The horizontal axis of 6 represents the volume ratio B / A, the dashed line in 6 represents the change of the rotational force F1 in the first direction, which is at the float 33 acts in terms of volume ratio B / A, and the solid line in 6 represents the change of the rotational force F2 in the second direction in terms of the volume ratio B / A. As in 6 is shown when the volume ratio B / A of the closed space 36 in terms of the total volume of the float 33 is larger, the rotational force F1 in the first direction larger. On the other hand, when the volume ratio B / A is smaller, the rotational force F2 in the second direction becomes larger. Assuming that the magnitude of the rotational force in the first direction is the same as that in the second direction, that is, assuming that F1 = F2, according to the expression (1) and the expression (2), the following expression is obtained: AY - (A - B) X = (A - B) X (3)

Therefore, when F1 = F2, the volume ratio B / A = K of the sealed space becomes 36 in terms of the total volume of the float 33 expressed as follows: K = (2X - Y) / 2X (4)

The polyoxymethylene resin as the material for the float 33 has a specific gravity of 1.41 and the ink has a specific gravity of 1.07. Therefore, the volume ratio K according to the expression (4) is 0.62. In practice, it is desirable that the volume ratio K is determined within the following range: (2X-Y) / 2X-0.1 <K <(2X-Y) / 2X + 0.1 (5)

In particular, it is when the specific density 1 . 41 or a value approximately equal thereto, as in the case of the polyoxymethylene resin as the material for the float 33 , is, desirable, that the volume ratio K is within a range of not less than 0.5 and not more than 0.7.

In the description of the principle of rotation of the lever 32 as described above, the preferred ratio of the volume K (= B / A) of the float is 33 determined while the buoyancy forces and the gravitational forces acting on the other constituent parts (the diaphragm 34 and the lever 32 ) as the swimmer 33 act, have been neglected. However, when the buoyancy forces and the gravitational forces acting on the visor 34 and the lever 32 act, significant quantities in terms of buoyancy and gravity on the float 33 have, it is necessary to determine the preferred volume ratio K (= B / A), while the buoyancy forces and the gravitational forces acting on the diaphragm 34 and the lever 32 act, be taken into account.

According to the first embodiment explained above, when the lever is on 32 in accordance with the amount of the ink in the ink tank 11 is rotated, the deflection paths of the float 33 and the aperture 34 through the lever 32 established. Therefore, it is possible to control the amount of the ink in the ink tank 11 without being extremely affected by the disturbance caused by the surface tension of the ink, for example.

According to the first embodiment, even if the rotational force in the first direction is on the lever 32 acts when the ink is sufficiently in the ink tank 11 is stored, possible, the aperture 34 with the help of the regulatory body 35 to stop reliably at the detection position.

According to the first embodiment, when the amount of the ink is reduced and the lever becomes 32 is rotated in the second direction, the aperture 34 then moves to the non-detection position, and the absence of the iris 34 at the detection position is determined by the sensor 21 detected. Therefore, it is possible the situation where the amount of ink in the ink tank 11 is reduced to be less than a predetermined amount, and the situation in which the ink cartridge 1 not in the installation section 70 is built in, than to capture the identical situations. That is, it is possible the situation where the amount of ink in the ink tank 11 is reduced to be smaller than the predetermined amount, and the situation in which the ink cartridge 1 not in the installation section 70 is installed using the sensor 21 capture. Therefore, in the case of the ink jet printer according to the first embodiment, not only possible by using a sensor, it is the residual amount of the ink in the ink tank 11 to judge, but it is also possible to distinguish whether another ink cartridge 1 with a large residual amount of ink required to be reinstalled. Therefore, the effort is reduced.

According to the first embodiment, the float is 33 with the tightly closed room 36 Mistake. Therefore, it is possible the specific gravity of the entire float 33 to lower efficiently. In the first embodiment described above, the material having the specific gravity larger than that of the ink is the float 33 used. The swimmer 33 however, it may be formed of a material having a specific gravity smaller than that of the ink to obtain a sufficient rotational force in the first direction.

According to the first embodiment, for example, when the volume ratio K of the tightly closed space 36 in terms of the total volume of the float 33 0.62, the rotational force in the first direction, which is at the lever 32 affects the size, which is the same as that of the torque in the second direction. Therefore it is possible to use the lever 32 to be more easily rotated without being greatly affected by the disturbance caused by, for example, the increase of the viscosity of the ink as well as the surface tension of the ink. It is possible to know the amount of ink in the ink tank 11 to display more correctly.

In addition, according to the first embodiment, the aperture 34 the non-transparency, and the aperture 34 is in the interior of the recess 52 with a narrow width in the ink tank 11 is formed, arranged. Therefore, it is possible to use an optical sensor of a light-transmitting type which is less expensive than the detector. The lever 32 who with the swimmer 33 and the aperture 34 is constructed as the thin plate-shaped member having the narrow width of the projection plane with respect to the ink liquid surface. Therefore, the surface tension caused by the lever 32 is absorbed by the ink is reduced. Therefore, it is possible the aperture 34 while correctly following the reduction of the ink.

Second embodiment

Next, a second embodiment according to the present invention will be explained with reference to the drawings. In the second embodiment, only the shutter mechanism differs from that in the first embodiment. Therefore, in the drawing The same terms as those of the first embodiment are denoted by the same reference numerals, and an explanation thereof will be omitted.

7 shows sectional views showing an ink cartridge according to the second embodiment. 7A shows a state in which the inside of the ink tank 11 filled with the ink, and 7B shows a state in which the ink in the ink tank 11 is consumed. 8th shows a sectional view taken along a line VIII-VIII, the in 7B shown is recorded. The iris mechanism 30A the ink cartridge 1A is based on the amount of ink in the ink tank 11 stored, powered. As in 7A shown is the aperture mechanism 30A at the bottom of the ink tank 11 arranged. The iris mechanism 30A includes a support stand 31A , a lever (a link) 32A , a float (an equilibrium member) 33A that at one end of the lever 32A is disposed an aperture (a detection target portion) 34A at the other end of the lever 32A is arranged, and a regulatory member 35A , A pivoting member 80 is out of the lever 32A , the swimmer 33A and the aperture 34A built up.

As in 7 shown is the support stand 31A a member having a trapezoidal side surface near the center of the bottom of the ink container 11 is attached. The lever 32A is a thin plate-shaped member that extends in a certain direction. The lever 32A is on the support stand 31 so that the extending direction has a predetermined angle of inclination with respect to the bottom wall 51a (please refer 2 ) of the projection 51 of the ink tank 11 forms. Further, the lever 32a on the support stand 31a worn, so the lever 32A around the fulcrum, where the lever 32A on the support stand 31 is worn, is pivotable. The lever 32A is on the support stand 31A carried so that the width of the projection plane, by vertically projecting the lever 32A with respect to the ink liquid surface is narrowest, and the surface (upper surface of the lever 32A in 7A ) of the lever 32A that may oppose the ink liquid surface has a predetermined angle of inclination with respect to the ink liquid surface. Furthermore, as in 7A shown, the lever 32A slightly bent or curved near the middle of the extension direction, leaving the lever 32A towards the ink tank 11 upwards is concave when the lever 32A on the support stand 31A worn. As in 8th shown is a curved section (projection) 32AA on the surface of the lever 32A formed opposite to the ink liquid surface.

As in 9 shown is the float 33A a member with a cylindrical shape. The swimmer 33A has, as described below, compared with the aperture 34A an enormous volume. Further, as described below, a tightly closed space 36A to be filled with air, as in 10 shown in the float 33A educated.

As in 7 shown is the aperture 34A at the end formed on the side of the side on which the float 33A of the lever 32A is disposed opposite. The aperture 34A is a thin plate member that is not transparent and substantially rectangular. The aperture 34A is arranged so that the aperture 34A in the interior 52A the recess 52 attached to the sidewall of the ink tank 11 is formed, moves (rotates) when the lever 32A is subjected to the pivoting movement. More precisely, as in 7A shown when a sufficient amount of the ink in the ink tank 11 is stored and the entire float 33A positioned in the ink, then the buoyancy force on the float 33A works, greater than gravity. Therefore, if the float 33A is moved upward toward the ink liquid surface, the lever 32A then in the clockwise direction (the first direction) in 7 turned, and the aperture 34A is at the detection position (the position corresponding to the sensor 21 opposite) of the recess 52 of the ink tank 11 arranged. In this situation, the aperture is 34A arranged so that the width of the projection plane, by vertically projecting the aperture 34A with respect to the ink liquid surface is narrowest. In this situation lies, as in 7A shown, a rod-shaped support member 34aA , which is as described below at an upper part of the aperture 34A is formed on a regulatory member 35A on, leaving the aperture 34A is not located at a position lower than the detection position. Accordingly, the rotation of the lever 32A regulated in the first direction. On the other hand, as in 7B shown when the amount of ink in the ink tank 11 is reduced, and part of the float 33A protruding from the liquid surface of the ink, then gravity is attached to the float 33A acts, greater than the buoyancy force. Therefore, as in 7B shown, the swimmer 33A towards the bottom surface of the ink container 11 moved down, and the lever 32A becomes in the counterclockwise direction (the second direction) in 7B turned. Accordingly, as in 7B shown the aperture 34A at the non-detection position (the position corresponding to the sensor 21 not opposite) in the vicinity of the upper part of the recess 52 of the ink tank 11 arranged.

As in 7A Shown is an extending part, which is in a state in which the aperture 34A is located at the detection position, extends upward, at the upper end of the aperture 34A intended. The rod-shaped support member 34aA which is disposed in the vertical direction (the direction perpendicular to the sheet surface of the drawing) with respect to both side surfaces of the extending part is formed near the upper end of the extending part.

As in 7A shown is the regulatory element 35A at the upper ends of the recess 52 and the projection 51 of the ink tank 11 educated. The regulatory element 35A lies on the support member 34aA the aperture 34A if there is a sufficient amount of the ink in the ink container 11 is stored, and the entire float 33A is positioned in the ink liquid. Accordingly, the regulatory member serves 35A as a link, the rotation of the lever 32A regulated in the specific direction (the first direction), so that the aperture 34A is not positioned at a position lower than the detection position.

As described above, in the second embodiment, as in FIG 7A shown when the amount of ink in the ink tank 11 big and the whole swimmer 33A is positioned in the ink liquid, then the support member 34aA on the regulatory member 35A on, the aperture 34A is at the detection position of the recess 52 arranged and the aperture 34A is higher in position than the float 33A arranged. Further, in the second embodiment, the part of the lever 32A which is located near the center of the extending direction, slightly bent or curved so that the part toward the ink container 11 is concave upward. Therefore, the aperture is 34A compared with the case where the lever 32A not bent or curved, arranged at the upper position.

An explanation of the structure of the pivoting member 80 is referring to 9 and 10 performed. 9 shows a development that the pivoting member 80 represents. 10 shows sectional views taken along a line XX, the in 9 is shown are included. 10A shows a sectional view showing a developed state of the float 33A represents, and 10B shows a sectional view showing an assembled state of the float 33A represents. The pivoting member 80 is made of a polypropylene resin. As in 9 shown is the pivot member 80 in a state in which the swimmer 33A is developed, formed in one piece. As in 10A shown, includes the float 33A a housing 33AA , a lock 33 ba and a link 33cA , As in 10A shown is the case 33AA a member having a cylindrical shape extending in a certain direction. The housing 33AA is provided with the interior with an opening disposed at one end. The closure 33 ba has a member for sealing the interior of the housing 33AA , The connecting link 33cA is a plate-shaped member for connecting the housing 33AA and the lock 33 ba , The connecting link 33cA has an end with a part near the middle in the extension direction of the housing 33AA connected, and the other end, with the end surface of the closure 33 ba connected is.

When the developed swivel link 80 assembled, then is the link 33cA as in 10A shown bent, and the end of the lock 33 ba on the side, the end surface, with the link 33cA is connected, is opposite, is located at the opening of the housing 33AA (Arrow in 10A is shown) arranged. As in 10B shown is the interior of the housing 33AA by engaging the lock 33 ba with the opening of the housing 33AA tightly closed. Accordingly, the tightly closed space 36A educated. The specific gravity of polypropylene as the material for forming the pivot member 80 is 0.9. Therefore, in this embodiment, it is preferable that the ratio K of the volume of the sealed space 36A in terms of the volume of the float 33A is within a range of not less than 0.3 and not more than 0.5 (see the expression (5)).

According to the second embodiment explained above, as shown in FIG 7A shown, the arranged position of the float 33A lower than the lower end of the bezel 34A , Therefore, when the amount of the ink is in the ink tank 11 is reduced, the aperture 34A earlier than the swimmer 33A from the ink liquid surface. That's why the swimmer stands 33A from the ink liquid surface in front of the lever 34A to turn after the ink, which is near the aperture 34A sticks, flows down. Accordingly, it is possible to reduce the influence of the surface tension of the ink when the iris 34A is turned. It is possible to display the correct amount of ink.

According to the second embodiment, the lever 32A arranged so that the width of the projection plane, by vertically projecting the lever 32 with respect to the ink liquid surface is narrowest. Therefore, it is possible the contact surface between the lever 32A and reduce the ink liquid surface. Accordingly, it is possible to determine the influence of Surface tension of the ink on the lever 32A reduce when the lever 32A is rotated, and it is possible to display the ink amount more correctly.

According to the second embodiment, as in 7A shown is the lever 32A arranged so that the side wall of the lever 32A that can face the ink liquid surface is inclined with respect to the ink liquid surface. Therefore, it is possible the contact surface between the lever 32A and the ink liquid surface further decrease. The lever 32 is obliquely arranged with respect to the ink liquid surface which is lowered when the ink is consumed. Therefore it is for the lever 32 just as easy to effect liquid bleeding for the ink. The iris mechanism 30 is moved more easily. Accordingly, it is possible to influence the surface tension of the ink on the lever 32A continue to reduce.

According to the second embodiment, as in 8th shown the curved section 32AA on the side wall of the lever 32A formed opposite to the ink liquid surface. Therefore, it is possible the contact surface between the lever 32A and the ink liquid surface further decrease. Accordingly, it is possible to influence the surface tension of the ink on the lever 32A continue to reduce.

In addition, according to the second embodiment, the float 33A made of polypropylene, which has the specific gravity of 0.9, which is lighter than the specific gravity of the ink. Therefore, it is easy, the buoyant force acting on the float 33A is generated, increase. This contributes to the miniaturization of the float 33A at. Even if the ink is in the tightly closed space 36A enters, it is possible the buoyancy force on the float 33A to generate, because the specific gravity of the float 33A lighter than the specific gravity of the ink.

According to the second embodiment, the tightly closed space 36A in the float 33A by engaging the housing 33AA and the lock 33 ba of the pivoting member 80 Made in one piece fashion. Therefore, the float can 33A be produced easily and inexpensively.

According to the second embodiment, the aperture 34A arranged so that the width of the projection plane, by vertically projecting the aperture 34A with respect to the ink liquid surface is narrowest. Therefore, it is possible to contact surface between the panel 34A and reduce the ink liquid surface. Accordingly, it is possible to influence the surface tension of the ink on the diaphragm 34A reduce when the aperture 34A is turned.

Third embodiment

One third embodiment of the present invention will be explained. In the third embodiment the present invention is applied to an inkjet printer, which is able to discharge four color inks.

As in 11 shown includes the inkjet printer 101 for example, an ink jet head 102 that with nozzles 102a for discharging the four color inks of cyan (C), yellow (Y), magenta (M) and black (K) to the recording paper P, four holders 104 ( 104a . 104b . 104c . 104d ), which are cassette mounting sections for installing four ink cartridges 103 ( 103a . 103b . 103c . 103d ) to each store the four color inks serve a car 105 that moves back and forth linearly and the inkjet head 102 along a guide 109 in a certain direction (a direction perpendicular to the paper surface) moves, a transport mechanism 106 of the recording paper P in the direction perpendicular to the direction of movement of the ink-jet head 102 parallel to the ink discharge surface of the ink jet head 102 transported, a cleaning unit 107 containing the high viscosity ink and the air in the inkjet head 102 contained, sucks, and a control unit 108 that control the entire inkjet printer 101 can manage.

In the inkjet printer 101 The recording paper P is transported by the transport mechanism 106 in the right and left direction in 11 transported while the inkjet head 102 through the car 105 in the direction perpendicular to the paper surface in 11 driven and moved back and forth. In cooperation with this, the ink becomes the nozzle 102a of the inkjet head 102 through the supply pipe 110 from the holder 104 into the ink cartridge 103 is installed, supplied. Further, the ink from the nozzles 102a to the recording paper P, and the recording paper P is subjected to printing.

As in 11 shown includes the cleaning unit 107 a cleaning closure 111 that of the inkjet head 102 may be installed so that the Tintenentladeoberfläche is covered with the same, and a suction pump 170 taking the ink from the nozzles 102a sucks. The cleaning unit 107 is at the position corresponding to the inkjet head 102 is disposed opposite, with the recording paper P lying between them. The cleaning unit 107 is movable in the direction to be relative to the ink discharge surface of the ink jet head 102 to make an approach or a separation. When the inkjet head 102 outside a printing area in which the recording paper P can be subjected to printing, the suction pump 170 used to mix the air that is mixed in the ink jet head and / or the high viscosity ink as a result of the evaporation of water from the nozzles 102a suck.

As in 11 shown are the four holders 104a to 104d in the inkjet printer 101 provided while in the inkjet printer 101 aligned in an array. The four ink cartridges 103a to 103d , which store the inks of cyan, yellow, magenta and black, are each in the four holders 104a to 104d built-in. The black ink of the four color inks is used more often than the other three color inks in many cases. In such a case, it is preferable that the volume of the black ink cartridge be greater than that of the ink cartridges 103a to 103c for the color inks is.

An ink supply pipe (communicating pipe) 112 and a delivery tube 113 for atmospheric air are upright at positions, each one an ink supply valve 121 and a delivery valve 122 for atmospheric air of the ink cartridge 103 correspond, respectively at the bottom of the holder 104 as described below. A sensor of an optical type 114 (Optical sensor of a light-transmitting type) is for the holder 104 provided to the ink remaining amount in the ink cartridge 103 capture. The sensor 114 has a light emitting section 114a and a light receiving section 114b which are arranged at an identical height position and which are opposed to each other, so that the ink cartridge 103 is arranged between the two sides. It is detected whether the light from the light emitting section 114a through a shutter mechanism 123 as described below in the ink cartridge 103 is provided, blocked or not. A received detection result becomes the control unit 108 output.

Next is the ink cartridge 103 explained in detail. In this embodiment, the ink cartridges have 103a to 103c each storing the three types of color inks, the same structure as that of the ink cartridge 103d storing the black ink. Therefore, one of the ink cartridges 103 explained.

As in 12 to 14 shown includes the ink cartridge 103 a cassette main body 120 storing the ink, an ink supply valve 121 capable of opening / closing the ink supply passage to the ink jet head 102 the ink contained in the cassette main body 120 is included, supply, an introduction valve 122 atmospheric air capable of opening / closing the atmospheric air introducing passage to the atmospheric air from the outside into the cartridge main body 120 to bring in a shutter mechanism 123 that is the light coming from the light emitting section 114a of the sensor 114 is emitted, blocked to detect the ink remaining amount in the ink cartridge 103 , and a clasp 124 , which is the lower end of the cassette main body 120 covered.

The cassette main body 120 is formed from a light-transmitting synthetic resin. As in 14 shown is a compartment wall 130 which extends horizontally in the cassette main body 120 formed in one piece. The interior of the cassette main body 120 is through the compartment wall 130 in an ink chamber (an ink container) 131 located on the upper side, and two valve accommodating chambers 132 . 133 , which are arranged on the lower side, divided. The ink chamber 131 is loaded with each of the color inks. The ink supply valve 121 and the delivery valve 122 for atmospheric air are respectively in the two valve accommodating chambers 132 . 133 accommodated. In this arrangement, the ink supply passage used is the ink entering the ink chamber 131 loaded into the exterior, in the valve housing chamber 132 built up. As will be described below, the flow of ink from the side of the ink chamber 131 is downwardly formed in the ink supply passage (see 19B ). As in 12B and 12C shown is a lead 134 that protrudes slightly outward and that extends in the downward direction at a substantially middle position in the height direction of the side wall of the cartridge main body 120 educated. The light emitting section 114a and the light receiving section 114b of the sensor 114 for the holder 104 are provided are in a state in which the ink cartridge 103 in the holder 104 is installed, at a height which is approximately equal to that of the projection 134 at the side wall of the cassette main body 120 is formed, positioned.

As in 15 to 17 shown is a recess 134a at the interior of the projection 134 in the ink chamber 131 educated. As in 15 to 17 shown, the recess extends 134a in the direction (the downward inclined direction) perpendicular to the ink surface, and the recess 134a has two inner wall surfaces (downwardly inclined inner surfaces) 134b that face each other. As in 15 to 17 is shown a shield plate (a detection target cut) 160 of the iris mechanism 123 which is described below, in the recess 134a arranged so that the shield plate 160 between the two inner wall surfaces 134b the recess 134a is arranged. As in 15 to 17 shown is a rib 158 Towards the shield plate 160 in the recess 134a is arranged, protruding and extending in the vertical direction, on each of the inner wall surfaces 134b educated. As in 15 to 17 shown are two support target surfaces (control surfaces) 156 extending in directions to be in one of the upper ends of the respective inner wall surfaces 134b identical level to make a separation from each other, in the ink chamber 131 educated. The bearing target surfaces 156 are surfaces on which support sections 160a as described below at the top of the shield plate 160 are formed, rest. The bearing target surfaces 156 are inclined surfaces, each at a predetermined angle to the bottom surface of the ink chamber 131 is inclined (to make a cut with the ink surface) (see 14 ). As in 15 to 17 shown are vertical wall surfaces 169 each of which is connected to the end of the inner wall surface 134b placed on the side of the side of a connection with the inner wall of the ink chamber 131 is disposed opposite, and the end of the support target surface 156 placed on the side of the side of a connection with the inner wall of the ink chamber 131 is disposed in the ink chamber 131 educated. As in 15 to 17 shown are ribs 157 formed so that each of them over the support target surface 156 and the vertical wall surface 169 extends and each of them perpendicular to the extending direction of the support portion 160a standing on the pad target surface 156 rests, is arranged. In a state where the rest section 160a on the pad target surface 156 rests as in 15 shown are the outermost ends of the support portion 160a adjacent and opposite to the side surfaces of the ribs 157 arranged. As in 15 to 17 shown is the rib 157 over the area of the end of the bearing target surface 156 on the side of the inner wall of the ink chamber 131 to the end opposite it and over the area from the end of the vertical wall surface 169 on the side of the bearing target surface 156 to the end opposite to it, formed continuously. 18 shows cross sections of the boundaries between the rib 157 and the pad target surface 156 and the vertical wall surface 169 , In the case of the ink cartridge of this embodiment, as shown in FIG 18 shown the radius of curvature of the boundary depending on a position of the connection between the rib 157 and the pad target surface 156 and the vertical wall surface 169 , 18A shows the cross section that defines the boundary between the rib 157 and the pad target surface 156 represents. 18B shows the cross section that defines the boundary between the rib 157 and the upper end surface of the vertical wall surface 169 represents. 18C shows the cross section that defines the boundary between the rib 157 and the lower end surface of the vertical wall surface 169 represents. As in 18A to 18C is shown, the curvature of the curved portion (A in 18A ), at the border between the rib 157 and the pad target surface 156 is formed smaller than the curvatures of the curved portions (B and C in FIG 18B and 18C ), at the boundaries between the rib 157 and the vertical wall surface 169 are formed. The curvature of the curved portion (B in FIG 18B ), at the border between the rib 157 and the upper end surface of the vertical wall surface 169 is smaller than the curvature of the curved portion (C in FIG 18C ), at the border between the rib 157 and the lower end surface of the vertical wall surface 169 is formed.

As in 14 to 17 shown includes the aperture mechanism 123 which is in the lower chamber of the ink chamber 131 is provided, a shield plate 160 (a detection target portion) which is not transparent to the light, a hollow float 161 (an equilibrium member), a link 162 that the shield plate 160 and the swimmer 161 connects, and a support stand 163 on the upper side of the compartment wall 130 is provided and the connecting member 162 rotatably supports. The deflection member (pivot member) is from the shield plate 160 , the swimmer 161 and the link 162 built up. The swimmer 161 is a cylindrical member that has a tightly closed space filled with air in it. The specific gravity of the entire float 161 is smaller than the specific gravity of the ink in the ink chamber 131 to be changed. The shield plate 160 and the swimmer 161 are each at both ends of the link 162 intended. A columnar rotary shaft 162a acting in directions perpendicular to the two side surfaces of the link 162 protrudes, is in the vicinity of the center of the extension direction of the connecting member 162 educated. The connecting link 162 is on the support stand 163 in the vertical plane (in the plane parallel to the sheet surface of the drawing) around the center of the rotating shaft 162a rotatably supported.

As in 14 to 17 shown, is the rotary shaft 162a attached to the link 162 is formed, from the flat surfaces on both sides of the link 162 in the direction perpendicular to the direction of deflection of the Ink surface in front. To the rotation of the link 162 making it easier to handle is the rotary shaft 162a on the support stand 163 such that the rotary shaft 162a also to some extent in the plane parallel to the leaf surface of 16 is, is rotatable. That is, the carrier stand 163 carries the pivot member at the lower position, so that the movement other than the rotation of the link 162 around the middle of the rotary shaft 162a may also be allowed. The outermost ends of the rotary shaft 162a in the projecting directions, by the two side surfaces of the connecting link 162 protrude, lie on side wall surfaces of the mutually opposite sides of a pair of support plates 163a coming from the ground surface (the compartment wall 130 as described below) of the ink chamber 131 are provided upright. Accordingly, the deflection of the entire pivot member in the right and left directions on the blade surface of 16 regulated.

The shield plate 160 is a thin plate-shaped member that is parallel to the vertical plane (the plane parallel to the leaf surface of 14 is) and that has a predetermined area. As in 14 shown has the shield plate 160 a rectangular surface and a triangular protruding surface formed to further extend upward from the upper end of the rectangular surface. The support section 160a which has a columnar shape extending from the shield plate 160 towards the two ribs 157 (in the direction along the ink surface) is formed at the upper end of the protruding surface. The support section 160 lies on the pad target surface 156 in the ink chamber 131 on. Accordingly, the rotation of the link is 162 in the specific direction (the first direction) regulated to the shield plate 160 to arrange at a predetermined position. More precisely, as in 14 shown when the rest section 160a on the pad target surface 156 rests, the shield plate 160 at the detection position between the light-emitting portion 114a and the light receiving section 114b the recess 134a arranged. In this situation, the light that comes from the light-emitting section 114a of the sensor 114 through the wall of the light transmitting cassette main body 120 and the ink in the ink chamber 131 has been transmitted through the shield plate 160 blocked. On the other hand, if the rest section 160a from the pad target surface 156 is disconnected (when the pivot member is in a state in 14 indicated by two-dot dashed lines), is the shield plate 160 arranged at a position other than the detection position. In this situation comes the light coming from the light emitting section 114a is transmitted at the light receiving section 114b without being blocked.

Therefore, in a state where the residual amount of ink in the ink chamber floats 131 big and the whole swimmer 161 at one end of the link 162 is provided, is positioned in the ink (in a situation in which the pivot member is in a state in 14 represented by solid lines), the float 161 in accordance with the buoyancy force on the float 161 acts, and the link 162 is turned. The support section 160a the shield plate 160 however, lies on the support target surface 156 on, and the rotation of the link 162 is regulated. Therefore, the shield plate 160 at the other end of the link 162 is provided at the detection position, that is, at the position where the light is emitted from the light emitting portion 114a is emitted in the lead, is blocked. However, if the remaining amount of ink in the ink chamber 131 is reduced, and part of the float 161 protrudes from the ink liquid surface, then the buoyancy force on the float 161 affects, decreases, and the swimmer 161 is moved downward in accordance with gravity (in a state where the pivot member is in 14 indicated by two-dot dashed lines). Accordingly, the shield plate 160 moved to the position (non-detection position) compared with the interior of the projection 134 is arranged upward, so that the direct light coming from the light emitting section 114a is emitted through the shield plate 160 is not blocked. Therefore, the direct light coming from the light emitting section 114a is emitted by the light-transmitting projection 134 along the linear optical path, and the light passes through the light receiving section 114b recorded directly. Accordingly, the state in which the residual amount of ink in the ink chamber becomes 131 is reduced by the sensor 114 detected.

As in 14 to 17 shown are columnar pins (protrusions) 159 coming from the shield plate 160 towards the inner wall surfaces 134b the recess 134a protrude, respectively on the two side surfaces of the rectangular surface of the shield plate 160 (near the end of the pivot member) is formed. The extreme end of the pen 159 is constructed to form a curved surface. As in 14 shown are the outermost ends of the pins 159 always in a state in which they are the inner wall surfaces 134 the recess 134a within a range of movement of the support portion 160a between the position where the support section 160a on the bearing target surfaces 156 rests, and the position at which the support section 160a from the bearing target surfaces 156 is separated, ge genüberliegen. The pencil 159 has a size of a protrusion to form a gap to such an extent that no capillary phenomenon by at least the surface tension of the ink between the shield plate 160 and the inner wall surface 134b is caused even if the extreme end of the pen 159 on the inner wall surface 134b the recess 134a rests and the shield plate 160 the inner wall surface 134b approaching.

In this structure, in a state where the ink cartridge 103 in the holder 104 is installed, the projection 134 of the ink cartridge main body 120 between the light emitting section 114a and the light receiving section 114b of the sensor 114 arranged. In this situation, the width of the projection 134 narrower than the distance between the light emitting section 114a and the light receiving section 114b , Therefore, a predetermined interval between the light emitting portion 114a and the light receiving section 114b and the lead 134 maintained. As in 12 and 13 shown is a pair of ribs 155 extending in the same direction as the extension direction of the projection 134 extend so that the projection 134 between them, for the cassette main body 120 at both ends in the horizontal direction (the left / right direction of the leaf surface in FIG 12B ) on the outer wall surface where the projection 134 is formed, provided. A lid member 135 is at the upper end of the cassette main body 120 welded. The ink chamber 131 in the cartridge main body 120 is through the lid member 135 locked.

As in 14 shown is an injection hole 136 between the two valve-housing chambers 132 . 133 formed to the ink in the ink chamber 131 the empty ink cartridge 103 inject. A plug link 137 , which is made of synthetic rubber, is with a force in the injection hole 136 introduced. As in 14 Shown is an opening that is in communication with the ink chamber 131 in the cartridge main body 120 stands, through a part of the injection hole 136 formed near the top of the sidewall. When the ink is loaded, the plug member becomes 137 in the injection hole 136 pierced by an injection needle (not shown), and the injection needle penetrates the opening passing through the part of the injection hole 136 formed near the top of the sidewall, allowing the ink through the injection needle into the ink chamber 131 is loaded.

As in 14 shown is a cylindrical section 138 projecting downhill at a part of the compartment wall 130 holding the ceiling of the valve-housing chamber 132 forms, for accommodating the ink supply valve 121 formed in one piece in the same. A section 139 a thin film showing the communication passage in the cylindrical section 138 is formed, closes, is at the lower end of the cylindrical portion 138 intended. On the other hand, two cylindrical sections 140 . 141 , each projecting upwards and downwards, at a part of the compartment wall 130 holding the ceiling of the valve-housing chamber 133 forms, for accommodating the Einbringventils 122 for atmospheric air in the same one piece formed. A section 142 a thin film showing the communication passage in the cylindrical sections 140 . 141 is formed, closes, is at the lower end of the cylindrical portion 141 provided at the lower side. Furthermore, as in 14 shown a cylindrical member 143 extending up to the top of the ink chamber 131 extends, on the upper side of the cylindrical portion 140 intended.

As in 14 shown includes the ink supply valve 121 a valve main body 145 formed with synthetic rubber or the like to have a substantially cylindrical shape and having elasticity, and a valve plug 146 which is in the valve main body 145 housed and made of synthetic resin. As in 19 As shown, the valve main body comprises 145 a drive section 147 , a valve seat portion 148 and a fitting section 149 , which are formed integrally and in this order from the upper side (the side of the ink chamber 131 ) are aligned.

In this structure, the lower surface of the valve plug lies 146 on the upper surface of the valve seat portion 148 (the end surface on the side of the ink chamber 131 opposite). A through hole 148a that extends in the vertical direction is through a part of the axial center of the valve seat portion 148 educated. A leadership hole 149a that with the through hole 148a of the valve seat portion 148 communicates and extends downwards is for the fitting section 149 educated. The leadership hole 149a is formed to have a shape widening to the end where the diameter is increased at lower positions. An annular groove 149b is about the leadership hole 149a educated. In this structure, the wall is for forming the guide hole 149a readily in the direction in which the diameter of the guide hole 149a is extended, elastically deformable. Therefore, it is when the ink supply pipe 112 in the leadership hole 149a is introduced, possible, the leakage of the ink by improving the dense contact performance between the guide hole 149a and the ink supply pipe 112 so to avoid as far as possible. Even if the ink supply pipe 112 in a state where the ink supply tube 112 regarding the guide hole 149a is inclined, or in a state in which the center axis of the guide hole 149a from the center axis of the ink supply pipe 112 deviates, into the leadership hole 149a is introduced, the ink supply tube 112 in the leadership hole 149a Reliably introduced because the wall portion in the direction in which the diameter of the guide hole 149a is extended, is elastically deformed.

As in 19 shown, includes the drive section 147 a cylindrical side wall portion 147a extending from the outer circumferential side portion of the valve seat portion 148 toward the side of the ink chamber 131 extends, and a projecting portion 147 in the radial direction of the sidewall portion 147a from the upper end of the sidewall portion 147a integrally protruding inwards. The bottom surface of the projecting section 147b lies on the valve plug 146 on. The valve plug 146 is due to the elastic forces of the sidewall portion 147a and the projecting portion 147b driven downwards. An opening 147c is at the interior of the protrusion portion 147b educated. In this construction, the side wall portion 147a and the projecting section 147b which are formed in an integral manner, readily elastically deformable.

As in 19 and 20 shown includes the valve plug 146 a bottom section 150 standing on the valve seat section 148 of the valve main body 145 rests, a cylindrical valve side wall portion 151 extending from the outer circumferential side portion of the bottom section 150 towards the ink chamber 131 extends, and a breakthrough section 152 coming from the middle of the bottom section 150 compared with the valve side wall portion 151 excessively toward the ink chamber 131 protrudes.

An annular projection 150a leading to the valve seat section 148 protrudes, is on the lower surface of the bottom section 150 of the valve plug 146 (The end surface, the valve seat portion 148 opposite) is formed. The valve plug 146 is through the drive section 147 of the valve main body 145 toward the valve seat portion 148 driven. In a state (a state that is in 19A is shown), in which the annular projection 150a a tight contact with the upper surface of the valve seat portion 148 is the through hole 148a of the valve seat portion 148 through the valve plug 146 closed, and the ink supply passage is closed. Further, a plurality of (for example, eight) communication passes 153 which provides communication between the upper space and the lower space of the valve plug 146 at equally distributed positions in the circumferential direction of the portion of the bottom portion 150 of the valve plug 146 formed, wherein the part compared with the annular projection 150a on the outer circumferential side and compared to the valve side wall portion 151 formed on the inner circumferential side.

As in 19 and 20 shown is the breakthrough section 152 of the valve plug 146 from four slab members 152a . 152b . 152c . 152d constructed, combined in a cross-section seen in a plan view. The breakthrough section 152 is at a substantially central part of the bottom section 150 upright. As in 20 shown are grooves 154 extending in the vertical direction, respectively, between the plate members (for example, between the plate members 152a . 152b ) formed perpendicular to each other. The breakthrough section 152 goes through the opening 147c at the interior of the protrusion portion 147b of the valve main body 145 so that the breakthrough section 152 protrudes upward. As in 14 is the extreme end of the breakthrough section 152 arranged at the position slightly lower than the section 139 a thin film of the cylindrical section 138 is before the ink cartridge 103 in the holder 104 is installed.

When the ink cartridge 103 in the holder 104 is installed, the ink supply tube 112 that for the holder 104 is provided in the guide hole 149a of the valve main body 145 introduced. Accordingly, the valve plug will 146 through the extreme end of the ink supply tube 112 upwards against the driving force of the driving section 147 of the valve main body 145 pressed. The valve plug 146 is moved upwards while moving the drive section 147 deformed. The annular projection 150a attached to the bottom surface of the valve plug 146 is provided is of the valve seat portion 148 separated (see 19B ). In this situation, the section 139 a thin film of the cylindrical section 138 through the outermost end of the breakthrough section 152 of the valve plug 146 which has been moved upwards, broken through. Accordingly, as in 14 and 19B shown the ink in the ink chamber 131 is contained by the communication passage in the cylindrical portion 138 into the valve-housing chamber 132 , Further, the ink passes through the communication passages 153 of the valve plug 146 from the ink supply pipe 112 the inkjet head 102 fed. In this situation, the valve-housing chamber works 132 as the ink supply passage. The flow of ink (arrow in 19B ), from the side of the ink chamber 131 down is formed.

As in 14 shown, is the delivery valve 122 for atmospheric air with the valve main body 145 and the valve plug 146 which is in the valve main body 145 is housed, provided. The delivery valve 122 for atmospheric air is the same as the ink supply valve 121 built up. That is, the introduction valve 122 For atmospheric air is constructed such that the valve plug 146 that by the drive section 147 is driven downwards, a tight contact with the valve seat portion 148 of the valve main body 145 makes, so that the valve plug 146 the through hole 148a closes. When the ink cartridge 103 in the holder 104 is installed, the introduction tube 113 for atmospheric air in the guide hole 149 that is in the valve main body 145 is formed, introduced. Similar to the ink supply valve 121 becomes the valve plug 146 moved up, and the section 142 a thin film of the cylindrical section 141 is through the breakthrough section 152 of the valve plug 146 breached. Accordingly, the outside atmospheric air flows from the introduction tube 113 for atmospheric air over the communication passages 153 of the valve plug 146 into the valve-housing chamber 133 , Further, the atmospheric air is transmitted through the inner passage of the cylindrical member 143 and the cylindrical sections 140 . 141 in the upper part of the ink chamber 131 brought in.

The closure 124 is formed of the non-transparent material through which no light is transmitted unlike the cartridge main body 120 , As in 12 to 14 shown is the shutter 124 on the cassette main body 120 securely moored, for example, by ultrasonic welding in a state in which the lower end of the valve main body 120 covered with the same. Two annular projections 165 which protrude downward are respectively at the positions of the bottom of the shutter 124 , respectively, the ink supply valve 12 and the delivery valve 122 correspond to atmospheric air formed. In this structure, for example, if the ink cartridge sticks 103 placed on a table, the ink attached to those near the inlets of the ink supply valve 121 and the delivery valve 122 For atmospheric air adheres, for example, hardly on the table surface.

As in 12 to 14 shown is a rib 166 that extends in the vertical direction, on the side wall portion of the closure 124 on the same side as the tab 134 on the outside wall of the cassette main body 120 is formed, formed. The rib 166 is under the lead 134 educated. As in 12B and 14 shown are the rib 166 and the shield plate 160 in the lead 134 of the cartridge main body 120 at the positions separated by a predetermined distance from each other in the vertical direction. The rib 166 is at the position that is lower than the shield plate 160 is arranged. Therefore, the rib 166 in a state where the ink cartridge 103 in the holder 104 is installed, at the position, which is lower than the light-emitting section 114a and the light receiving section 114b of the sensor 114 is positioned. Further, there is the rib 166 at the position between the light emitting section 114a and the light receiving section 114b of the sensor 114 is arranged, as seen in a plan view, in which the ink cartridge 103 seen in the direction of installation. The width of the rib 166 is narrower than the width of the projection 134 , and the projecting distance of the rib 166 is shorter than the projecting distance of the projection 134 ,

The rib 166 is detected such that the rib 166 between the light emitting section 114a and the light receiving section 114b of the sensor 114 goes through to the light from the light emitting section 114a of the sensor 114 just to exclude instantaneously when the ink cartridge 103 in the holder 104 is installed or if the ink cartridge 103 from the holder 104 is removed. On the other hand, the rib exists 166 in the state of installation of the ink cartridge 103 at the position lower than the sensor 114 , Therefore, the rib becomes 166 through the sensor 114 not recorded. Only the shield plate 160 that are in the ink chamber 131 can be arranged through the sensor 114 be recorded. That is, the rib 166 can through the sensor 114 only be detected when the ink cartridge 103 attached / removed. Therefore, it is using the control unit 108 as described below, based on the result of detection of the rib 166 to recognize if the ink cartridge 103 is installed or not. In the third embodiment, the structure is provided such that the rib 166 through the sensor 114 merely by attaching / removing the ink cartridge 103 is detected in a certain direction. Therefore, it is unnecessary to perform a complicated operation that would otherwise be performed to the rib 166 with the sensor 114 capture. Furthermore, it is possible to break the rib 166 that would otherwise be caused, for example, by contact with the holder 104 because the rib 166 is exposed to the outside and weak in strength is to be avoided to the utmost.

Next, the control unit 108 explained. The control unit 108 manages the control of various operations performed by the inkjet printer 101 For example, unload the ink from the nozzles 102a of the inkjet head 102 , the supply of the paper to the ink-jet head 102 and unloading the printing paper that is being printed by the ink-jet head 102 has been subjected to include. The control unit 108 For example, a central processing unit (CPU) serving as a computation processing unit includes a read-only memory (ROM) in which programs executed by the CPU execute and data to be used for the programs are stored, Random Access Memory (RAM) temporarily storing data during execution of the program, a nonvolatile memory such as a rewritable EEPROM. Electrically Erasable Programmable Read-Only Memory), an input / output interface, and a bus. As in 11 shown controls the control unit 108 a plurality of devices for constructing the inkjet printer 101 for example, the inkjet head 102 , the engine of the transport mechanism 106 to drive the car 105 and the suction pump 170 the cleaning unit 107 include, based on various signals received from an external personal computer (PC) 182 be entered.

As in 11 shown, includes the control unit 108 Further, a built-in state judging section 180 indicating the installed state of the ink cartridge 103 in the holder 104 based on the output signal of the sensor 114 and an ink remaining amount calculating section 181 that holds the residual amount of ink in the ink chamber 131 is included, calculated.

The following is an explanation of the processing steps of the built-in state judging section 180 and the ink remaining amount calculating section 181 with reference to a flowchart for the built-in state judgment process described in FIG 21 is shown made. In 21 Si (i = 10, 11, 12, ...) indicates each of the steps of the processing operation. This flowchart exemplifies the processing steps to be used when the ink cartridge 103d for storing the black ink in the holder 104d is installed.

First, the routine proceeds when it is judged that the rib 166 for the closure 124 is provided by the sensor 114 in a state where the power supply to the inkjet printer 101 is not detected in the judging process of S10 (in the case of "no" of the judgment result of S10), the ink remaining amount calculating process of S14 continues. On the other hand, if it is judged that the rib 166 through the sensor 114 is detected in the judging process of S10 (in the case of "Yes" of the judgment result of S10), the routine proceeds to the judging process of S11. In the judging process of S11, it is judged whether the cassette immediately before the detection of the rib 166 was installed or not. When the ink cartridge 103d just before the detection of the rib 166 in the holder 104d was installed (in the case of "Yes" of the judgment result of S11), it is judged that the ink cartridge 103d from the holder 104d has been removed, and the information that corresponds to the fact that the ink cartridge 103d in the non-installed state is stored (S12). In this case, it is unnecessary to calculate the remaining amount of ink. Therefore, the routine is subjected to returning as it is.

If the ink cartridge 103d not immediately before the rib is detected 166 was built in the judging process of S11 (in the case of "No" of the judgment result of S11), the rib becomes 166 the ink cartridge 103d , in the 13 is shown, therefore, by installing the ink cartridge 103d in the holder 104d detected. Therefore, the information that corresponds to the fact that the ink cartridge 103d is in the built-in state (S13). Thereafter, the routine proceeds to the ink remaining amount calculating process of S14.

In the ink remaining amount calculating process of S14, if the shield plate 160 of the iris mechanism 123 is detected (if the remaining ink amount is sufficient), the remaining amount of ink from the maximum capacity of the ink cartridge 103d and the accumulated value of the number of liquid droplets of the ink after the time of installation of the ink cartridge 103d have been discharged, approximately calculated. On the other hand, if the shield plate 160 of the iris mechanism 123 is not detected (if the remaining ink amount is decreased), the remaining ink amount of the ink remaining amount, in a state in which the shield plate 160 is not detected, and more correctly calculates the accumulated value of the number of liquid droplets of the ink which have been discharged upon arrival at the condition described above. The remaining amount of ink calculated at S14 becomes a PC 182 is transmitted (S15), and the routine is subjected to returning.

The information, for example, the installation state of the ink cartridge 103 and the accumulated value of the discharged ink are stored in the nonvolatile memory such as the EEPROM, so that the information itself in a state in which the power supply of the ink jet printer 101 OFF, be kept.

According to the third embodiment described above, the distance between the shield plate becomes 160 and the inner wall surface 134b the recess 134a that are in the ink chamber 131 is formed by the pins 159 attached to the side surfaces of the shield plate 160 of the pivot member are formed, maintained. In this situation, the distance that has such an extent that no capillary phenomenon is caused by the surface tension of the ink, between the shield plate 160 and the inner wall surface 134b recorded. It is possible the adhesion between the shield plate 160 and the inner wall surface 134b due to the surface tension of the ink and the deterioration of the smooth movement of the deflection of the shield plate 160 to avoid. That is, the ink surface that is between the shield plate 160 and the inner wall surface 134b can also be lowered in a similar manner when the ink surface is lowered in accordance with the consumption of the ink.

No ink, the deflection of the shield plate 160 Due to the surface tension of the ink prohibits, remains between the shield plate 160 and the inner wall surface 134b back. Therefore, in the third embodiment, the shield plate 160 be operated smoothly in accordance with the change of the ink remaining amount. Therefore, it is possible to know the fact that the remaining amount of ink in the ink chamber 131 at the predetermined amount arrives to detect with a small error.

The pivot member (the deflectable member) is supported so that the rotation to some extent in the plane parallel to the blade surface of 16 can be made. Therefore, it is feared that the shield plate 160 at the position separated from the point of carrying by the support stand 163 is provided, depending on the distance between the shield plate 160 and the inner wall surface 134b the inner wall surface 134b can approach too close. To solve this problem, the operation of the shield plate 160 by widening the distance between the shield plate 160 and the inner wall surface 134b be made more easily without being affected by the surface tension of the ink. In this case, however, it is necessary that the distance between the light emitting section 114a and the light receiving section 114b of the sensor 114 also widened, which is given the sensitivity of the sensor 114 is an unsatisfactory countermeasure. It is necessary depending on the distance between the light emitting section 114a and the light receiving section 114b to use a sophisticated sensor with a higher sensitivity. According to the third embodiment, however, the distance between the shield plate 160 and the inner wall surface 134b regulated to such an extent that the smooth movement of the shield plate 160 with the help of the pens 159 attached to the side surfaces of the shield plate 160 of the pivot member are formed, is not deteriorated by the surface tension of the ink. Therefore, it is possible the distance between the shield plate 160 and the inner wall surface 134 to shorten further. At the same time it is also possible, the width of the projection 134 to narrow down. Furthermore, it is possible to change the width of the projection 134 continue to narrow, as the shield plate 160 the thin plate-shaped member is. Accordingly, the low-cost optical sensor of a light-transmitting type having a low sensitivity can be used as the sensor 114 to be used.

In addition, according to the third embodiment, the ribs 158 extending in the vertical direction of the inner wall surfaces 134b extend, on the inner wall surfaces 134b the recess 134a in the ink chamber 131 educated. Therefore, the ink is between the shield plate 160 and the inner wall surface 134b accumulated, successfully allowed, along the ribs 158 to fall down. Accordingly, it is possible the adhesion between the shield plate 160 and the inner wall surfaces 134b by further avoiding the surface tension of the ink.

Further, according to the third embodiment, the outermost ends of the pins 159 attached to the side surfaces of the shield plate 160 of the pivot member are formed by the curved surfaces. Therefore, take the pins 159 the point-to-point contact with the inner wall surfaces 134b the recess 134a in the ink chamber 131 in front. Therefore, even if there is an ink between the pens 159 and the inner wall surfaces 134b remaining, it is possible to suppress the remaining amount to a minimum. That is, the pins 159 and the inner wall surfaces 134b hardly adhere to each other due to the surface tension of the ink. As a result, it is possible to use the shield plate 160 to operate smoothly when the remaining amount of ink is changed. It is possible the fact that the remaining ink quantity in the ink chamber 131 at the predetermined amount arrives to detect with a small error.

According to the third embodiment, the support portion 160a at the top of the shield plate 160 is formed, the columnar member. Therefore, make the pad section 160a and the support target surfaces 156 in the ink chamber 131 the line-to-line contact. Accordingly, the contact surface between the support portion 160a and the bearing target surfaces 156 reduced. Therefore, the pad portion adhere 160a and the bearing target surfaces 156 by the surface tension of the ink hardly together. Therefore, it is possible the shield plate 160 to operate smoothly in accordance with the change of the remaining ink amount. It is possible the fact that the remaining ink quantity in the ink chamber 131 at the predetermined amount arrives to detect with a small error.

According to the third embodiment, the ink that is on the support target surfaces 156 that are in the ink chamber 131 are accumulated, by the capillary force of the curved portion, at the boundary between the support target surface 156 and the rib 157 that over the pad target surface 156 and the vertical wall surface 169 is formed, sucked, and the ink falls along the rib 157 down. Therefore, the pad portion adhere 160a and the bearing target surface 156 by the surface tension of the ink hardly together. At the same time puts in a state in which the rest section 160a on the pad target surface 156 rests, the extreme end of the support section 160a a contact with the side surface of the rib 157 ago. Therefore, the ink is between the rest section 160a and the pad target surface 156 also held by the capillary force of the curved portion at the boundary between the support target surface 156 and the rib 157 is formed, sucked off. Therefore, the support section 160a at an appropriate time depending on the ink surface drop from the pad target surface easily 156 be removed.

According to the third embodiment, as in 18 shown, the structure supplied in which the curvatures in the order of curvature of the curved portion (C in 18C ), at the border between the rib 157 and the lower end surface of the vertical wall surface 169 is formed, the curvature of the curved portion (B in 18B ), at the border between the rib 157 and the upper end surface of the vertical wall surface 169 is formed, and the curvature of the curved portion (A in 18A ), at the border between the rib 157 and the pad target surface 156 is formed, be reduced. Accordingly, the capillary forces of the curved sections are at the boundaries between the rib 157 and the pad target surface 156 and the vertical wall surface 169 are formed at the lower parts of the rib 157 , which are positioned downwards, increased. The effect is effected to move the ink further downwards overall. That is, the ink that is near the boundary between the support target surface 156 and the rib 157 accumulated, tends to ease along the rib 157 to fall down.

In addition, according to the third embodiment, the support target surface 156 that are in the ink chamber 131 is formed, the inclined surface. The ink lying on the pad target surface 156 accumulated, falls and flows down the inclined surface. Therefore, the ink becomes less easily on the rest surface 156 accumulated.

Further, according to the third embodiment, the connecting member 162 with the shield plate 160 turned, and so the shield plate 160 deflected. Therefore, the shield plate 160 be stably deflected along the predetermined path. Therefore, the shield plate adheres 160 hardly on the inner wall surface 134b which is located outside the predetermined path.

Fourth embodiment

Next, a fourth embodiment will be explained with reference to the drawings. In the fourth embodiment, substantially the same members as those of the third embodiment are denoted by the same reference numerals as those of the third embodiment, and an explanation thereof will be omitted. The support section 160a at the top of the shield plate 160 (the detection target portion) is deflected, so that the shield plate 160 the circular arcuate path images when the support section 160a from the position (detection position) where the abutment portion 160a on the bearing target surfaces 156 that are in the ink chamber 131 are formed, rests, to the position (non-detection position), in which the support portion 160a from the bearing target surfaces 156 is separated, is moved. Accordingly, in the fourth embodiment, as in FIG 22 shown, ribs 158A that extend continuously as they travel along the deflection track (the circular arcuate path) of the shield plate 160 are curved, and those towards the shield plate 160 in the recess 134a is arranged, project, on the respective inner wall surfaces 134b the recess 134a educated.

According to the fourth embodiment explained above, the ink between the surface of the deflection of the shield plate becomes 160 and the inner wall surfaces 134b the recess 134a accumulated, successfully allowed, along the ribs 158A to fall down. Dement Speaking it is possible to prevent the shield plate 160 and the inner wall surfaces 134b adhere to each other by the surface tension of the ink. Therefore, it is possible the shield plate 160 to operate smoothly in accordance with the change of the remaining ink amount. It is possible the fact that the remaining ink quantity in the ink chamber 131 at the predetermined amount arrives to detect with a small error.

Fifth embodiment

When Next will be an explanation of a fifth Embodiment with reference to the drawings performed. In the fifth embodiment are essentially the same members as those of the third Embodiment by the same reference numerals those of the third embodiment, and an explanation thereof will be omitted.

As in 23 shown includes a shutter mechanism 123B , which is in the lower chamber of the ink chamber 131 is provided, a non-transparent shield plate 160B (a detection target section), a hollow float 161 (an equilibrium member), a link 162B that the shield plate 160B and the swimmer 161 connects, a support stand 163 standing at the compartment wall 120 is provided and the connecting member 162B rotatably supports, and a pair of prevention walls 167 that causes a lateral fluctuation of the link 162B prevented. In the fifth embodiment, the deflectable member (pivot member) is the shield plate 160B , the swimmer 161 and the link 162B built up. The swimmer 161 is a cylindrical member with a tightly closed space filled with air in it. The specific gravity of the entire float 161 is smaller than the specific gravity of the ink in the ink chamber 131 is included. The shield plate 160B and the swimmer 161 are each at both ends of the link 162B intended. A columnar rotary shaft 162aB extending in the direction perpendicular to the side surfaces of the link 162B protrudes is near the center in the extending direction of the link 162B educated. The connecting link 162B is on the support stand 163 around the axis of the rotary shaft 162aB rotatably supported. As in 23 As shown, the pair consists of prevention walls 167 of plate-shaped members extending in the vertical direction from the bottom surface of the ink chamber 131 extend. The pair of prevention walls 167 is between the rotary shaft 162a and the vertical wall surfaces 169 in the ink chamber 131 intended. Further, the pair of prevention walls 167 arranged at such positions that the link 162B between the pair of prevention walls 167 is arranged.

The shield plate 160B is a thin plate-shaped member that is parallel to the vertical surface (the plane parallel to the leaf surface of 14 is) and that has a predetermined area. The shield plate 160B has a rectangular surface and a triangular protruding surface formed to further extend upward from the upper end of the rectangular surface. A support section 160a which has a columnar shape extending in the direction perpendicular to the side walls of the ribs 157 (the direction along the ink surface) is formed at the upper end of the protruding surface.

As in 23 shown are columnar pins (protrusions) 159B extending in the vertical directions towards the flat surfaces of the prevention walls 167 protrude, respectively on the two side surfaces of the connecting member 162B that between the pair of prevention walls 167 is arranged, formed. The extreme ends of the pins 159B are constructed of curved surfaces. In this structure are the outermost ends of the pins 159B within a range in which the overlay section 160a the shield plate 169B between the position (detection position) of an overlay on the platen target surfaces 156 and the position (non-detection position) of separation from the support target surfaces 156 is moved, always the inner surfaces of the prevention walls 167 across from.

According to the fifth embodiment explained above, the structure is provided in which the pins 169B attached to the two side surfaces of the link 162B are formed between the pair of prevention walls 167 are arranged. Accordingly, the distances between the shield plate 160B and the inner wall surfaces 134B maintained. Therefore, it is possible to prevent the shield plate 160B and the inner wall surfaces 134b adhere to each other by the surface tension of the ink. Therefore, it is possible the shield plate 160B to operate smoothly in accordance with the change of the remaining ink amount. It is possible the fact that the remaining ink quantity in the ink chamber 131 at the predetermined amount arrives to detect with a small error. The pencils 159B and the side surfaces of the prevention walls 167 which are opposite to the same, are in the vicinity of the rotary shaft 162aB educated. Therefore, the deflection range of the pen 159B reduced, and it is possible the small size of the prevention wall 167 that the pen 169B opposite to realize.

The embodiments of the present invention have been explained above. However, the present invention is not limited to the embodiments that have been explained above, for which the design can be variously changed within the scope defined in the claims. For example, the first embodiment is constructed such that the regulating member 35 is provided to the rotation of the lever 32 to regulate in the first direction. However, the present invention is not limited thereto, it may be constructed such that the regulating member 35 is not provided.

The first embodiment is constructed such that the aperture 34 is located at the detection position when the lever 32 is rotated in the first direction, and the aperture 34 is located at the non-detection position when the lever 32 is rotated in the second direction. However, the present invention is not limited thereto, and the following arrangement may be available. That is, the aperture 34 is located at the non-detection position when the lever 32 is rotated in the first direction, and the aperture 34 is located at the detection position when the lever 32 is rotated in the second direction.

The swimmer 33 is formed in the first embodiment of the polyoxymethylene resin, and the float 33A is formed in the second embodiment of the polypropylene resin. However, the present invention is not limited thereto. The float may be formed of a different resin, or the float may be formed of a material other than the resin.

In addition, in the first embodiment, the ratio K of the volume of the sealed space with respect to the total volume of the float 33 determined, so that the rotational force in the first direction of the lever 32 the same size as the torque in the second direction. However, the present invention is not limited thereto. The volume ratio K of the float 33 may be determined such that any one of the rotational force in the first direction and the rotational force in the second direction is larger than that of the others.

The first embodiment is constructed such that the aperture 34 is not transparent. However, the present invention is not limited thereto. The aperture may be constructed to transmit light. In this case, other than the optical sensor of a light-transmitting type used in the first embodiment may be used as the detector for the diaphragm 34 be used.

In the first embodiment, the optical sensor is a light-transmitting type for the sensor 21 used. However, the present invention is not limited thereto. Another optical sensor, such as a reflective type optical sensor, may be used. Alternatively, other than the optical sensor may be used. When an optical sensor of a reflective type than the sensor 21 is used, it is desirable that the aperture 34 is constructed so that the reflectance of the surface is raised.

In addition, the first embodiment is constructed such that the sensor 21 not only the state of the ink remaining amount in the ink tank 11 but also the presence or absence of the ink cartridge. However, the present invention is not limited thereto, and the following arrangement may be available. That is, the sensor 21 only the state of the ink remaining amount in the ink tank 11 to capture. The first embodiment is constructed such that the float 33 and the aperture 34 at the ends of the lever 32 are provided and the middle part of the lever 32 is supported by the support stand. There is no limit to that. As in 24 shown, one end of the support member 203 to be a free end, the swimmer 202 (the balance member) may be fixed at one end, and the other end of the support member 203 can be attached to the ink tank. In this case, a detection target portion may be provided on the float.

The first and second embodiments are constructed in such a way that the light-transmitting ink is used. The present However, the invention is not limited thereto. An ink that is not transmitting light is, can be used. In this case, it is preferable that the ink is not in a state where the ink is consumed accumulated at the detection position.

In the second embodiment, the curved portion 32AA on the surface of the lever 32A formed opposite to the ink liquid surface. However, the present invention is not limited thereto. The surface of the lever 32A that opposes the ink liquid surface may be formed to have any shape provided that the contact surface between the lever 32A and the ink liquid surface is reduced with this shape. For example, a projection having a thin plate shape may be formed on the wall surface opposite to the ink liquid surface.

The third embodiment is constructed such that the shield plate 160 is arranged to the deflection between the pair of inner wall surfaces 134b the recess 134a that are in the ink chamber 131 is formed to make. However, the present invention is not limited thereto. The arrangement can be made such that the shield plate 160 is deflected along an inner wall surface. In this case, the pen 159 on a side surface of the shield plate 169 be provided, and the pen 159 may be formed to face an opposite inner wall surface 134b preside.

The third embodiment is constructed such that the shield plate 160 has a thin plate shape. However, the present invention is not limited thereto. The shield plate 160 may have a different shape, such as any spherical shape.

The third embodiment is constructed such that the ribs 158 on the side surfaces of the inner wall surfaces 134b the recess 134a are provided, and the ribs 157 on the vertical wall surfaces 169 and the bearing target surfaces 156 in the ink chamber 131 are provided. However, the present invention is not limited thereto. There may be available an arrangement in which no rib as described above is provided.

In the third to fifth embodiments, the outermost ends of the pins 159 . 159B of the pivoting member constructed from the curved sections. However, the present invention is not limited thereto. Any shape of an extremity may be available, provided that the ink present in such an amount that the ease of operation is deteriorated during the deflection of the pivot member does not remain, even if the ink between the pen 159 and the inner wall surface 134b and / or between the pen 159B and the side surface of the prevention wall 167 remains. The shape of an outermost end of the pen 159 . 159B can be either sharp or flat.

In the third embodiment, the support portion 160a at the top of the shield plate 160 is provided, a columnar member. However, the present invention is not limited thereto. For example, the support section 160a be plate-shaped. The third embodiment is constructed such that the support target surface 156 in the ink chamber 131 the inclined surface is. However, the present invention is not limited thereto. The pad target surface 156 can be a horizontal surface.

The third embodiment is constructed such that the pivot member is in accordance with the increase / decrease in the amount of ink in the ink chamber 131 around the middle of the rotary shaft 162a is turned. However, the present invention is not limited thereto. For example, the following arrangement is available. That is, the pivot member is composed of a shield plate and a float directly connected thereto, and the pivot member is deflected to follow the deflection of the ink liquid surface in accordance with the increase / decrease in the amount of ink in the ink chamber.

In the fourth embodiment, the ribs are 158a attached to the inner wall surfaces 134b the recess 134a are formed along the deflection path of the shield plate 160 educated. However, the present invention is not limited thereto. So that the ink between the shield plate 160 and the inner wall surface 134b as far as possible is not restrained, and the panning is easily turned successfully, the ribs are 158A preferably formed to move along the deflection path of the pins 159 attached to the side surfaces of the shield plate 160 are formed to extend.

In the third to fifth embodiments, it is possible, for example, the shapes, the heights and the widths of the inner wall surfaces 134b that are in the ink chamber 131 are formed, and the ribs 157 . 158 . 158A at the landing target surfaces 156 and the vertical wall surfaces 169 are formed, suitable to change. In the third to fifth embodiments, the ribs are 157 over the area of the bearing target surfaces 156 and the vertical wall surfaces 169 formed, and the ribs 158 are formed to from the inner wall surfaces 134b towards the shield plate 160 preside. However, the present invention is not limited thereto. One of the ribs can be formed. In the third to fifth embodiments, the ribs have 157 covering the area from the pad target surfaces 156 and the vertical wall surfaces 169 are formed, the angle of a projection, which is perpendicular to the support target surfaces 156 is. However, the present invention is not limited thereto. The angle of a projection can be either an obtuse angle or an acute angle. However, the ink scarcely reaches the boundary between the support target surface 156 and the rib 157 is accumulated, the angle of a projection is preferably an obtuse angle.

In the third to fifth embodiments, the rib is 157 continuously over the area from one end to the other end of the up location target surface 156 intended. However, the present invention is not limited thereto. It is enough that the rib 157 over the pad target surface 156 and the vertical wall surface 169 can extend. It may also be allowed for the rib 157 up to a middle part of the support target surfaces 156 extends. With this arrangement, it is not to allow the ink between the support target surface 156 and the rest section 160a the shield plate 160 is held, preferable that the rib 157 on the pad target surface 156 extends to arrive at a position where the sidewall surface of the rib 157 in a state where the rest section 160a the shield plate 160 on the pad target surface 156 rests, a contact with the outermost end of the support portion 160a manufactures. Similarly, the rib may also be allowed 157 not to the lower end of the vertical wall surface 169 extends.

In the third to fifth embodiments, as in FIG 18A to 18C As shown, the relationship between the curvatures of the three curved sections lies at the boundaries between the rib 157 that over the area from the pad target surface 156 and the vertical wall surface 169 is formed, formed, and the bearing target surface 156 and the vertical wall surface 169 in the relationship, as with reference to 18A to 18C explained (curvature of 18A <Curvature of 18B <Curvature of 18C ). However, it may also be allowed that the relationship does not apply as described above.

In the third to fifth embodiments, the curvatures of the curved portions are those at the boundaries between the rib 157 that over the area from the pad target surface 156 and the vertical wall surface 169 is formed, and the bearing target surface 156 and the vertical wall surface 169 changed depending on the limit position. Similarly, the curvature of the curved portion at the boundary between the inner wall surface 134b and the rib 158 attached to the inner wall surface 134b the recess 134a is formed, depending on the limit position to be changed. More specifically, it is preferable that the curvature of the curved section, at the boundary between the rib 158 and the part near the top of the inner wall surface 134b is formed smaller than the curvature of the curved portion, which is at the boundary between the rib 158 and the part near the lower end of the inner wall surface 134b is formed. When the rib 158 is formed so that the relationship holds as described above is the capillary force of the curved portion that is at the boundary between the rib 158 and the part near the lower end of the inner wall surface 134b is formed, greater than the capillary force of the curved section, at the boundary between the rib 158 and the part near the top of the inner wall surface 134b is formed. Therefore, the ink tends to be at the boundary between the inner wall surface 134b and the rib 158 remains behind, along the rib 158 to fall down.

In the third to fifth embodiments, the ribs are 157 . 158 in relation to the recess 134a intended. However, the present invention is not limited thereto. The rib may be provided at any position, wherein the recess 134a does not matter.

In the third to fifth embodiments, the rotatable member is the shield plate 160 , the swimmer 161 and the link 162 is composed as the pivot member used. However, the present invention is not limited thereto. The pivot member may be a member such as a simple float that is not rotatable. Even if the pivot member is used, it is also allowed that the shield plate 160 has no thin plate shape.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 9-001819 [0002, 0003, 0003]

Claims (21)

Ink cartridge, with: an ink container, which stores an ink; and a pivoting member in the Ink tank is pivotally supported and that is an equilibrium member which is worn to be positioned in an ink liquid to be when a lot of the ink in the ink tank not less than a predetermined amount, wherein a weight and a volume of the balance member are adjusted so that a rotational force transmitted from the pivot member by a buoyancy force and a gravitational force generated at the equilibrium member when the balance member is positioned in the ink liquid is, is taken in a first direction, the opposite to a second direction of a rotational force generated by the pivot member by a buoyancy force and a gravitational force acting on the equilibrium member be generated when a part of the balance member of a Liquid surface of the ink protrudes, recorded becomes. An ink cartridge according to claim 1, wherein the Pivot member is a link located in the ink container pivotally supported, a detection target section which is at one end of the link, and the balance member, which is provided at the other end of the link, comprises; and Weights and volumes of the equilibrium member and the Detection target section are set so that the torque, that of the pivoting member by buoyancy forces and gravitational forces, each at the balance member and the detection target portion be generated when the entire equilibrium member and the entire Detection target portion positioned in the ink liquid are taken up, lying in the first direction, the opposite to the second direction of the rotational force passing through the pivot member by buoyancy forces and gravitational forces, respectively generated at the balance member and the detection target portion when parts of the balance member and the detection target portion protrude from the liquid surface of the ink, is recorded. An ink cartridge according to claim 2, wherein a regulating member, which regulates a rotation of the pivot member in the first direction, is provided in the ink tank, and the detection target portion is positioned at a detection position when the pivot member regulated by the regulatory member. An ink cartridge according to claim 2 or 3, wherein said Balance member is positioned at a position lower than that of the detection target section when the detection target section is positioned at the detection position. Ink cartridge according to one of the claims 2 to 4, in which the detection target section is at a non-detection position is positioned when the pivot member in the second direction is turned. Ink cartridge according to one of the claims 2 to 5, in which the rotational force in the first direction is one size that has essentially the same as the torque in the second Direction is. Ink cartridge according to one of the claims 2 to 6, in which the connecting member in the ink container is worn so that a width of a projection plane through projecting the connecting member perpendicular to the ink liquid surface becomes narrowest in a state of use of the ink cartridge is. Ink cartridge according to one of the claims 2 to 7, in which the connecting member in the ink container is supported so that a sidewall surface of the link, opposite the ink liquid surface, with regard to the ink liquid surface cuts diagonally. Ink cartridge according to one of the claims 2-8, wherein the at least one protrusion is toward the ink liquid surface protrudes and extending in an extension direction of the link, on the sidewall surface of the link, the the ink liquid surface is opposite, is formed. Ink cartridge according to one of the claims 1 to 9, in which the balance member is a float, the is made of a resin and has a specific density, which is smaller than the light transmitting ink, or wherein the equilibrium member is formed of polypropylene. Ink cartridge according to one of the claims 1 to 10, in which the equilibrium member is a closed space in the same has. An ink cartridge according to claim 11, wherein the Balance member with a housing and a closure is provided, which are integrally formed; and of the Closure arranged at an opening of the housing is, and an inner space of the housing is closed, to form the closed space. An ink cartridge according to claim 11 or 12, wherein a volume ratio K of the closed space with respect to a volume of the balance member is represented by the following expression: (2x-Y) / 2X-0.1 <K <(2X-Y) / 2X + 0.1 wherein X represents the specific gravity of the resin and Y represents the specific gravity of the light-transmitting ink, or a volume ratio K of the closed space with respect to a volume of the balance member is not less than 0.3 and not more than 0.5. Ink cartridge according to one of the claims 3 to 13, in which the detection target section is a non-transparency Has. Ink cartridge according to one of the claims 2 to 14, in which the detection target portion on the link is provided so that a width of a projection plane, the by vertically projecting the acquisition target section onto the Ink liquid surface is obtained, in a state of use of the ink cartridge is narrowest. Ink cartridge according to one of the claims 2 to 15, at the the ink cartridge further has a regulation surface having a deflection of the pivot member regulated; of the Ink tank has a downwardly inclined inner surface has, which is in a direction that regards the ink surface is inclined downwards, extends; with the pivot member a support section is formed, which is dependent from a position of the pivot member selectively at a position to rest on the regulatory surface, and one Position where it is separated from the regulation surface is located; and a lead during a Movement of the support section between the separated position and the support position always the downwardly inclined inner surface opposite, at a part of the pivot member, the facing downwardly inclined inner surface, is formed. An ink cartridge according to claim 16, wherein of the Ink tank is formed with a recess, the two the downwardly inclined inner surfaces facing each other Opposite, and through the two opposite is defined downwardly inclined inner surfaces; at least a part of the pivot member between the two downwardly inclined Inner surfaces, which lie opposite each other in the recess, is arranged; and the lead towards each of the downs inclined inner surfaces of a part of the pivot member, the one of the two downwardly inclined inner surfaces is opposite. The ink cartridge according to any one of claims 2 to 17, wherein the ink container has a regulating surface which is substantially perpendicular to a direction of deflection of the ink surface caused by use of the ink and a downwardly inclined inner surface extending in one direction. which is downwardly inclined with respect to the regulation surface, extends from one end of the regulation surface; the pivot member is formed with a seating portion selectively depending on a position of the pivot member at a position to be seated on the regulation surface and a position separated from the regulation surface; a recess defined by two of the downwardly inclined inner surfaces facing each other is formed on an inner wall surface of the ink container; at least a part of the pivot member is disposed between the two downwardly inclined inner surfaces opposed to each other in the recess; a protrusion that always faces each of the downwardly inclined inner surfaces from each of parts of the pivotal member opposing the downwardly inclined inner surfaces toward each of the downwardly inclined inner surfaces during movement of the support portion between the separated position and the support position; and a rib of each of parts of the two downwardly inclined inner surfaces facing the pivot member projects toward the pivot member, or wherein the ink tank regulates a regulating surface that regulates a deflection of the pivot member and a wall surface extending from an end of the regulation surface down to the ink liquid surface; the pivot member is formed with a seating portion selectively depending on a position of the pivot member at a position to be seated on the regulation surface and a position separated from the regulation surface; and a rib that extends over the regulating surface and the wall surface protrudes from both the regulating surface and the wall surface, or in which the ink container has a downwardly inclined inner surface extending in a direction perpendicular to a direction of deflection with respect to a surface the ink surface caused by use of the ink is inclined downward; and a rib of a part of the downwardly inclined inner surface facing the pivot member or the ink container has a regulating surface substantially perpendicular to a direction of deflection of the ink surface caused by consumption of the ink and a wall surface and a downwardly inclined inner surface extending from respective ones Ends of the regulating surface extending down to the regulating surface; the pivot member is formed with a columnar rest portion extending in a direction perpendicular to the direction of a deflection and depending on a position of the pivot member at a position to be seated on the regulation surface and a position separated therefrom is located; a first rib protruding from the regulating surface and the wall surface, the first rib extending over both the wall surface and the regulating surface and being located adjacent to the seating portion when the seating portion is in the seating position; a recess defined by a pair of the downwardly inclined inner surfaces opposed to each other is formed on an inner wall of the ink tank; and at least a part of the pivot member is disposed between the downwardly inclined inner surfaces opposed to each other in the recess, and projects a second rib from each of parts of the downwardly inclined inner surfaces opposed to the pivot member toward the pivot member. Inkjet printer with a mounting section, in the ink cartridge described in any one of claims 2 to 18 is defined, to record on a medium with an ink coming from the ink cartridge, which is built into the mounting section is, is supplied, perform a A detector comprising a detection target portion of the ink cartridge, which is installed in the installation section, detects, at one position, in the detection target section, which is at a detection position is positioned, is detectable, is provided. The inkjet printer of claim 19, further comprising a judgment unit, the states of the ink cartridge and the inkjet printer according to a result a detection obtained by the detector, in which an assessment of a condition in which a sufficient Amount of ink in the ink cartridge in the mounting section is installed, loaded, made by the assessment unit when the detector detects the detection target portion during an evaluation of any of a state in which the ink, the in the ink cartridge installed in the installation section, is contained, is reduced, and a state in which the ink cartridge is not installed in the installation section, is made when the detector does not detect the detection target section, or in which the detector is a sensor of a light-transmitting type is. Ink cartridge, with: an ink container, in which an ink is stored; a swimmer who is up the ink floats; a carrier member, which is the float swiveling, so that the swimmer does not make contact with an inner surface of the ink container manufactures; a detection target portion attached to the support member or the float is provided; and a regulatory member, which regulates the support member so that the float in The ink is positioned when a lot of the ink is in the Ink tank is included, not less than a predetermined Amount is.