JP2007170275A - Tubular pump and liquid injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular pump, in which defective sucking of liquid is prevented, torque fluctuations of a motor are stabilized, and noise of a motor is reduced. <P>SOLUTION: In the tubular pump 100, a rotating part 130 moving an abutment part 120 along a tube part 110 is provided with a liquid sucking part to which the abutment part is disposed when the tubular pump sucks the liquid, a non-sucking part of liquid to which the abutment part is disposed when the tubular pump does not suck the liquid, and a connection part for these parts. A ring-like member 160 for leveling load with respect to moving torque is formed between the tube part and the abutment part, and non-slip parts 120a, 160a are formed on an abutment part side of the ring-like member and/or the outside of the abutment part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tube pump for sucking liquid and the like and a liquid ejecting apparatus.

2. Description of the Related Art Conventionally, ink jet recording apparatuses have an ink jet recording head for ejecting ink onto recording paper or the like. Since this ink jet recording head discharges ink onto recording paper or the like via a nozzle, the ink thickens in the vicinity of the nozzle or bubbles are mixed in the nozzle, making it impossible to discharge the ink satisfactorily. There was a fear.
For this reason, the ink jet recording apparatus is provided with a head cleaning device in order to avoid these phenomena.

The head cleaning device has a capping unit arranged so as to cover the nozzles and a pump for making negative pressure in the capping unit, and is configured to perform cleaning by sucking ink in the vicinity of the nozzles by the pump. ing.
As the pump, a tube pump having a relatively simple structure and easy to be miniaturized is used (for example, Patent Document 1).
As shown in FIG. 3 of Patent Document 1, the tube pump is configured to suck ink by moving the roller member 21 in the counterclockwise direction, for example, while crushing the tube member 20.
JP 2004-314622 A (FIG. 3 etc.)

Thus, since the roller member 12 moves while pressing the tube member 20, friction is generated between the roller member 12 and the tube member 20, and the tube 11 is pushed out or pulled in by this friction, and the tube 103. Will be partially deformed.
FIG. 5 is a schematic explanatory view showing a state where the tube 11 is deformed due to friction with the roller member 12.
As shown in FIG. 5, the tube 11 is deformed and protrudes at a portion indicated by an arrow T. Since the roller member 12 proceeds in the direction of the arrow in FIG. 5, it is necessary to move over the protruding portion T in this way. At this time, there is a problem that a large load is applied to the motor that moves the roller member 12 and the suction of the tube pump becomes defective.
In addition, when a sudden load fluctuation occurs, the torque fluctuation of the motor increases, and there is a problem that a large load is applied to the motor and the motor noise increases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a tube pump and a liquid ejecting apparatus that can prevent the occurrence of poor liquid suction, stabilize the torque fluctuation of the motor, and achieve a quiet motor sound. To do.

  According to the present invention, the subject is a tube portion that sucks a liquid and is formed in an annular shape, a columnar contact portion that is movably disposed along the tube portion, and the contact portion. And a motor unit that generates a moving torque for moving the abutment part along the tube part, and a tube pump is provided in the rotation part. A liquid suction part in which the contact part is disposed when sucking liquid, a non-liquid suction part in which the contact part is disposed when the tube pump does not suck liquid, the liquid suction part, and the non-liquid And a connecting portion capable of reciprocating between the contact portion and the suction portion. The contact portion is arranged to be movable within the liquid suction portion, the non-liquid suction portion, and the connection portion. A rotation shaft portion is formed, and the contact portion is the rotation shaft. A ring pump for leveling fluctuations of the load with respect to the moving torque is formed between the tube portion and the abutting portion, and at least the This is achieved by a tube pump in which an anti-slip portion is formed on the contact portion side of the ring-shaped member and / or on the outside of the contact portion.

According to the said structure, the ring-shaped member for equalizing the fluctuation | variation of the load with respect to a moving torque is formed between the tube part and the contact part. For this reason, the abutting part directly presses the tube part, and a protruding part or the like due to partial deformation of the tube part caused by moving along the tube part does not occur.
Therefore, even if the contact portion is moved along the tube portion, the load on the moving torque of the motor portion does not partially increase. For this reason, the torque fluctuation of the motor unit is stabilized, the motor sound of the motor unit can be reduced, and the tube pump is less likely to cause liquid suction failure.

Moreover, according to the said structure, the anti-slip | skid part is arrange | positioned in the contact part side of a ring-shaped member and / or the outer side of a contact part.
For this reason, when a contact part moves between a liquid suction part and a non-liquid suction part in a connection part via a rotating shaft part, the situation where a contact part slips between ring members and cannot move. It can be prevented from occurring.
That is, for example, when the contact portion is arranged on the liquid suction portion side and the rotating portion rotates so as to press the contact portion against the liquid suction portion side, the position of the contact portion is the liquid suction portion side. Maintained. However, when the rotating part rotates in the direction separating the contact part from the liquid suction part side, the contact part becomes free in the connecting part.
At this time, if the contact portion holds its position with the frictional force with the ring-shaped member, the position of the contact portion is constant regardless of the rotation of the rotating portion. It can move to the suction part side.
However, unlike the above-described configuration, if the anti-slip portion is not disposed on the contact portion side and / or the outside of the contact portion of the ring-shaped member, the contact portion slides inside the ring-shaped member as the rotation portion rotates. Moving.
For this reason, the contact portion cannot be moved relatively from the liquid absorbing portion to the non-liquid absorbing portion, and cannot be changed between the liquid suction position and the non-suction position, resulting in liquid over-suction, liquid backflow, and the like. Sometimes.
In this regard, in the above-described configuration, since the abutting portion can be reliably disposed on the liquid suction portion side or the non-liquid suction portion side, a highly reliable tube pump that does not cause excessive liquid suction or liquid backflow, etc. Become.

  Moreover, according to the said structure, since a contact part crushes a tube part indirectly via a ring-shaped member, durability of a tube part will improve.

  Preferably, the anti-slip portion is a tube pump made of a material having a high friction coefficient.

Preferably, in the tube pump, the anti-slip portion has a meshing shape formed on the contact portion side of the ring-shaped member and on the outside of the contact portion.
According to the said structure, since it is the meshing shape formed in the contact part side of a ring-shaped member, and the outer side of a contact part, it can prevent reliably that a contact part slips with respect to a ring-shaped member.

  Preferably, the outer diameter of the ring-shaped member is greater than the outer diameter of the contact portion and is equal to or smaller than the inner diameter of the tube portion, and the ring-shaped member is moved toward the tube portion side by pressing of the contact portion. The tube pump is characterized by being configured to move eccentrically.

According to the above configuration, the outer diameter of the ring-shaped member exceeds the outer diameter of the contact portion and is equal to or smaller than the inner diameter of the tube portion. Largely formed.
For this reason, the contact area where the ring-shaped member contacts the tube portion is larger than the contact area where the contact portion contacts the tube portion. It becomes weaker than the case of the contact portion, and the partial deformation of the tube portion hardly occurs.
Therefore, the load with respect to the moving torque of the motor unit that moves the contact portion is not partially increased, the torque fluctuation of the motor unit is stabilized, and the tube pump is less likely to cause liquid suction failure.

  Preferably, in the tube pump, the base end portion of the tube portion is formed with a leak portion that separates the contact portion and the tube portion.

According to the said structure, the leak part which spaces apart between a contact part and a tube part is formed in the base end part of a tube part. In such a tube pump, conventionally, when the contact portion reaches the leak portion, the negative pressure generated in the tube portion is temporarily reduced.
Thus, it is necessary to increase the negative pressure in the tube portion again. Moreover, the load fluctuation of the motor part which drives the contact part which moves along a tube part was also large.
However, in the above configuration, the contact portion does not directly reach the leak portion, but the ring-shaped member, for example, moves eccentrically and reaches the leak portion. At this time, since the ring-shaped member has a larger outer diameter than the contact portion, the tube portion is pressed without being affected by the leak portion.
For this reason, the negative pressure which generate | occur | produces in a tube part does not fall temporarily. Therefore, the negative pressure in the tube portion can be increased to the maximum negative pressure in the shortest time. In addition, the torque fluctuation of the motor unit can be stabilized, and the tube pump has a stable liquid suction capability.

  The object is to suck a liquid and form an annular tube part, a columnar contact part arranged movably along the tube part, and the contact part along the tube part. And a motor unit that generates a moving torque for moving the abutting part along the tube part. Between the liquid suction part in which the contact part is disposed, the non-liquid suction part in which the contact part is disposed when the tube pump does not suck the liquid, and the liquid suction part and the non-liquid suction part. A connecting portion capable of reciprocating the contact portion is formed, and the contact portion is formed with a rotating shaft portion that is movably disposed in the liquid suction portion, the non-liquid suction portion, and the connection portion. The contact portion rotates around the rotation shaft portion. A liquid ejecting apparatus having a tube pump configured as described above, wherein the tube pump includes a ring-shaped member for leveling a variation in load with respect to the moving torque between the tube portion and the contact portion. The liquid ejecting apparatus is characterized in that a non-slip portion is formed at least on the contact portion side and / or outside of the contact portion of the ring-shaped member.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

(First embodiment)
FIG. 1 is a schematic perspective view showing an ink jet recording apparatus (hereinafter referred to as “recording apparatus”) 10 according to an embodiment of a liquid ejecting apparatus having a tube pump according to a first embodiment of the present invention.
(About the general configuration of the recording apparatus 10)
As shown in FIG. 1, the recording apparatus 10 includes a frame 11, and a platen 12 is disposed on the frame 11. On the platen 12, the paper P is fed by a paper feed mechanism (not shown).
Further, the recording apparatus 10 includes a carriage 13, and the carriage 13 is supported so as to be movable in the longitudinal direction of the platen 12 via a guide member 14, and is reciprocated by a carriage motor 15 via a timing belt 16. It has become.

An ink jet recording head (hereinafter referred to as “recording head”) 20 is mounted on the lower portion of the carriage 13. The recording head 20 is configured to eject, for example, ink that is a liquid with respect to the paper P.
Specifically, the recording head 20 has a nozzle that ejects ink, and is configured to eject ink droplets from the nozzle by expansion and contraction of a piezoelectric vibrator.
An ink cartridge 17 that contains ink is detachably mounted on the carriage 13, and the ink is supplied from the ink cartridge 17 to the recording head 20.
In other words, while the carriage 13 moves along the platen 12, the piezoelectric vibrator is expanded and contracted based on the print data, so that ink is ejected from the recording head 20 onto the paper P and printing is performed. ing.

In the frame 11 of FIG. 1, the paper P is arranged and has a print region T where printing is performed on the paper P. Further, the frame 11 has a home position H which is a non-printing area on one end side thereof.
The carriage 13 is configured to move between the printing region T and the home position H by moving along the platen 12.

(About composition at home position H)
As shown in FIG. 1, a head cleaning mechanism 30 is disposed at the home position H. The head cleaning mechanism 30 has a cap holder 31 and a tube pump 100. The cap holder 31 is installed on the frame 11 so as to be movable up and down by a known lifting means (not shown).

The head cleaning mechanism 30 has a cap 32. The cap 32 has a configuration in which the upper end edge of the cap 32 comes into contact with the nozzle plate or the like of the recording head 20 to seal the nozzles of the recording head 20.
By the way, as shown in FIG. 1, the recording apparatus 10 includes a blade 19. The blade 19 is in contact with the nozzle plate of the recording head 20 and performs a wiping operation by wiping off ink.

FIG. 2 is a schematic diagram showing the head cleaning mechanism 30 and the like of FIG.
As shown in FIG. 2, a sheet-like sponge 32 a is disposed at the bottom of the cap 32. The sponge 32a is configured to face the nozzles of the recording head 20 with a predetermined interval in a state where the cap 32 is in contact with the recording head 20, and absorb ink ejected from the nozzles of the recording head 20. .

Furthermore, as shown in FIG. 2, the cap 32 is formed with a discharge port 32b so as to penetrate the bottom surface thereof.
The tube pump 100 is provided in the frame 11 with the cap 32 sealing the nozzles of the recording head 20, reducing the pressure in the cap 32 to a negative pressure, and sucking ink from the nozzles of the recording head 20. The ink is discharged to the waste ink tank 33.

(Main configuration of tube pump 100)
FIG. 3 is a schematic diagram showing the main internal configuration and the like of the tube pump 100.
As shown in FIG. 3, the tube pump 100 includes a tube 110 that is a tube portion for sucking ink.
The tube 110 has such a shape that both ends of a flexible tube bent in an annular shape are pulled out in the same direction and bundled in the same plane.
Further, the tube pump 100 includes, for example, a columnar pulley 120 that is a contact portion that is movably disposed along the inner periphery of the tube 110. For example, the pulley 120 is configured to be rotatable about a pulley central shaft 121 which is a rotating shaft portion.

As shown in FIG. 3, the pulley 120 has a pulley main body 120b and a pulley outer peripheral portion 120a disposed outside the pulley main body 120b.
The pulley main body 120b is made of metal or plastic and has high rigidity, but its friction coefficient is low, for example, about 0.3.
On the other hand, a pulley having a high coefficient of friction, for example, a rubber having a coefficient of friction of about 0.7 is arranged on the pulley outer peripheral part 120a (an example of the outside of the contact part) arranged outside the pulley body 120b. (An example of a non-slip part).
Further, the tube pump 100 includes, for example, a disk-shaped rotating plate 130 that is a rotating unit that moves the pulley 120 along the inner periphery of the tube 110.

Further, as shown in FIG. 3, for example, a guide groove 131 is formed in the rotating plate 130, which is a connecting portion in which the pulley central shaft 121 can move. That is, the pulley 120 moves in the guide groove 131 so that the distance between the pulley 120 and the tube 110 can be changed.
Specifically, as shown in FIG. 3, the upper end in the drawing of the guide groove 131 is a suction end 131a, and the lower end in the drawing is a release end 131b.

Further, as shown in FIG. 3, the pulley 120 is a ring-shaped member, for example, is disposed so as to be able to press the tube 110 via a ring-shaped member 160.
As shown in FIG. 3, the ring-shaped member 160 includes a ring-shaped member main body 160b and a ring-shaped member inner peripheral portion 160a disposed inside the ring-shaped member main body 160b.
Since the ring-shaped member main body 160b is made of metal or plastic, the rigidity is high, but the coefficient of friction is low, for example, about 0.3.
On the other hand, a rubber having a high friction coefficient, for example, a rubber having a friction coefficient of about 0.7 is disposed on the ring-shaped member inner peripheral portion 160a (an example of the contact portion side of the ring-shaped member) (slip prevention portion). Example).

Moreover, as shown in FIG. 3, the friction coefficient of the tube 110 with which the ring-shaped member main body 160b abuts is high, for example, about 0.7.
Further, as shown in FIG. 3, the ring-shaped member 160 has a large outer diameter that exceeds the outer diameter of the pulley 120. The outer diameter of the ring-shaped member 160 is not limited to the outer diameter of the present embodiment, but may be larger than the outer diameter of the pulley 120 and not more than the inner diameter of the tube 110.
Further, the ring-shaped member 160 is configured to be able to move eccentrically toward the tube 110 when the inner ring-shaped member 160a, which is the inner side thereof, is pressed toward the tube 110 by the pulley 120.
Accordingly, the ring-shaped member 160 is also moved eccentrically so as to follow the movement of the pulley 120 along the tube 110.

  That is, when the pulley 120 is positioned at the suction end 131 a, the pulley 120 is disposed so as to crush the tube 110 via the ring-shaped member 160. Therefore, when the pulley 120 squeezes and moves the tube 110 counterclockwise as shown by the arrow in FIG. 3 via the ring-shaped member 160, the cap side 110a of the tube 110 becomes negative pressure and ink is sucked. become. Then, the ink is discharged to the waste ink tank side 110b of the tube 110.

On the other hand, when the pulley 120 is positioned at the release end 131b of FIG. 3, the pulley 120 and the ring-shaped member 160 move in a direction not to crush the tube 110, so that the tube pump 100 can be in a non-suction state. It has a configuration.
Therefore, the suction end portion 131a is an example of a liquid suction portion that is formed on the rotating plate 130 and in which the pulley 120 is disposed when the tube pump 100 sucks ink. The release end portion 131b is an example of a non-liquid suction portion where the pulley 120 is disposed when the tube pump 100 does not suck ink.
Furthermore, the guide groove 131 is an example of a connecting portion that allows the pulley 120 to reciprocate between the suction end portion 131a and the release end portion 131b.
The pulley central shaft 121 is an example of a rotating shaft portion that is formed on the pulley 120 and is movably disposed in the suction end portion 131 a, the release end portion 131 b, and the guide groove 131.

Further, as shown in FIG. 3, for example, a stepping motor 150 that is a motor unit that generates a moving torque for moving the pulley 120 along the tube 110 is connected to the rotating plate 130.
That is, when the stepping motor 150 is driven, the rotating plate 130 is rotated, and the pulley 120 is moved on the inner peripheral side of the tube 110 via the ring-shaped member 160 by the rotation of the rotating plate 130.

Further, as shown in FIG. 3, the tube 110 is an annular base end portion, and a portion where the tube 110 is bundled is a leak portion in which the pulley 120 and the tube 110 are separated from each other. A point 111 is formed.
Since there is a space between the pulley 120 and the tube 110 at the leak point 111, when the pulley 120 is directly disposed at the leak point 111, the amount of crushing of the tube 110 is reduced, and suction is insufficient. Part.

Next, a mechanism for moving the pulley central shaft 121 of the pulley 120 between the suction end 131a and the release end 131b in the guide groove 131 formed in the rotating plate 130 will be described.
As shown in FIG. 3, when the pulley center shaft 121 is disposed on the suction end 131a side of the guide groove 131, the rotating plate 130 moves along the tube 110 in the direction opposite to the suction direction, which is the arrow direction. Then, the pulley central shaft 121 of the pulley 120 moves in the guide groove 131 toward the release end 131b. Then, after the pulley central shaft 121 reaches the release end 131b, the pulley 120 itself starts to move along the ring-shaped member 160.
Conversely, if the rotating plate 130 moves in the suction direction, which is the direction of the arrow in FIG. 5, with the pulley central shaft 121 disposed on the release end 131 b side of the guide groove 131, the pulley central shaft 121 is now reversed. Moves the guide groove 131 from the release end 131b toward the suction end 131a. Then, after the pulley center shaft 121 reaches the suction end 131a, the pulley 120 starts moving in the direction of the arrow.
As described above, the movement of the pulley 120 in the guide groove 131 of the pulley central shaft 121 is performed by the movement of the rotating plate 130. For this reason, the rotating plate 130 is configured to move the pulley 120 between the suction end portion 131a and the release end portion 131b via the guide groove 131.

Such movement of the pulley 120 in the guide groove 131, that is, movement between the suction end 131a and the release end 131b, requires that the pulley 120, which is involved in the rotation of the rotating plate 130, maintain its position. .
That is, when the pulley outer peripheral portion 120 a of the pulley 120 slides on the surface of the ring-shaped member inner peripheral portion 160 a of the ring-shaped member 160, the pulley 120 may move with the rotation of the rotating plate 130.
In this case, the following situation occurs. That is, in order to move the pulley 120 arranged at the suction end portion 131a of FIG. 3 to the release end portion 131b, the pulley 120 remains the ring-shaped member 160 even if the rotating plate 130 is rotated clockwise (counter arrow direction). Slips inside and moves clockwise.
In this case, if the tube pump 100 is subsequently driven, ink is excessively sucked or ink backflow occurs, causing the tube pump 100 to malfunction.

In this respect, in the present embodiment, since the ring-shaped member inner peripheral portion 160a of the ring-shaped member 160 and the pulley outer peripheral portion 120a of the pulley 120 are formed of rubber or the like having a high friction coefficient, the pulley 120 is the ring-shaped member. No slip inside 160.
Thus, since the pulley 120 does not slide inside the ring-shaped member 160 and follows the movement of the rotating plate 130, the pulley 120 is moved to the suction end 131a or the release end 131b in the guide groove 131. It can be moved reliably.
Therefore, the tube pump 100 is highly reliable without excessive ink suction or ink backflow.

In the present embodiment, since both the pulley body 120b and the ring-shaped member 160b are made of a material having high rigidity such as plastic, the pulley 120 and the ring-shaped member 160 have sufficient rigidity for crushing the tube 110. It is secured.
Conventionally, when a material having a high friction coefficient is used, the rigidity is lowered, and there is a problem that the tube 110 cannot be sufficiently crushed.
In this respect, in the present embodiment, the friction force can be increased while ensuring the rigidity of the pulley 120 and the ring-shaped member 160, so that the tube pump 100 is extremely reliable.

In this embodiment, rubber having a high coefficient of friction is disposed outside the pulley 120 and inside the ring-shaped member 160. However, the present invention is not limited to this, and the outside of the pulley 120 or the ring-shaped member 160 is not limited thereto. You may arrange | position rubber | gum etc. in any one inside.
Further, as long as a certain rigidity can be ensured, the entire ring-shaped member may be formed of a material having a high friction coefficient.

Further, according to the present embodiment, as shown in FIG. 3, since the outer diameter of the ring-shaped member 160 is larger than the outer diameter of the pulley 120, the ring-shaped member 160 abuts against the tube 110. The contact area is larger than the contact area where the pulley 120 contacts the tube 110.
That is, by using the ring-shaped member 160, the force for pressing the tube 110 per unit area can be weakened, and the protruding portion T (partial deformation) as shown in FIG. It has become.
For this reason, the load with respect to the moving torque of the stepping motor 150 that moves the pulley 120 does not partially increase, the torque fluctuation of the stepping motor 150 is stabilized, and the tube pump 100 is less likely to cause ink suction failure. . In addition, the tube pump 100 can also achieve a reduction in motor noise.
The stepping motor 150 is known to stop due to a step-out due to a large change in load. However, in this embodiment, the step-up motor 150 does not cause a step-out or the like because a large load change does not occur. .
That is, the ring-shaped member 160 is an example of a ring-shaped member for leveling fluctuations in load with respect to the moving torque of the pulley 120 between the tube 110 and the pulley 120.

  In the present embodiment, as shown in FIG. 3, the small-diameter pulley 120 indirectly crushes the tube 110 via the large-diameter ring-shaped member 160, so that the small-diameter pulley 120 is directly connected to the tube. The durability of the tube 110 is improved as compared with the case where the 110 is crushed.

Further, in the present embodiment, as shown in FIG. 3, the leak point 111 is formed in the tube pump 100 due to its structure. In such a tube pump, conventionally, when the pulley reaches the leak point 111, the negative pressure generated in the tube is temporarily reduced. Therefore, it is necessary to increase the negative pressure in the tube again.
In addition, the load fluctuation of the stepping motor 150 that drives the pulley that moves along the tube is large.
However, in the present embodiment, the pulley 120 does not directly reach the leak point 111 but the ring-shaped member 160 moves eccentrically toward the tube 110 and reaches the leak point 111.
At this time, since the outer diameter of the ring-shaped member 160 is larger than that of the pulley 120, the ring-shaped member 160 presses the tube 110 without being affected by the leak point 111. For this reason, the negative pressure which generate | occur | produces in the tube 110 does not fall temporarily. Therefore, the negative pressure in the tube 110 can be increased to the maximum negative pressure in the shortest time.
Further, the load fluctuation of the stepping motor 150 can be reduced, and the tube pump 100 having a stable ink suction capability is obtained.

Further, in the present embodiment, as shown in FIG. 3, the ring-shaped member 160 abuts on the tube 110, so it is more effective to deform the tube 110 and form the protruding portion T as shown in FIG. Can be suppressed.
Therefore, the tube pump 100 is less prone to ink suction failure and the like.

(Second Embodiment)
FIG. 4 is a schematic view showing a tube pump 200 according to the second embodiment of the present invention. Since the tube pump 200 according to the present embodiment has many configurations in common with the tube pump 100 according to the first embodiment described above, the common configurations are denoted by the same reference numerals and the like as those of the first embodiment. Will be omitted and the differences will be mainly described below.

In the present embodiment, unlike the first embodiment described above, as shown in FIG. 4, a ring-shaped member side tooth portion 261 is formed on the inner side of the ring-shaped member 260 on the pulley 220 side.
On the other hand, a pulley side tooth portion 221 is formed outside the pulley 220.
And these ring-shaped member tooth part 261 and the pulley side tooth part 221 become the structure meshed | engaged. That is, the ring-shaped member tooth portion 261 and the pulley-side tooth portion 221 have a meshing shape.
Thus, in this Embodiment, since the pulley 220 and the ring-shaped member 260 will mutually mesh, the situation where the pulley 220 slips inside the ring-shaped member 260 can be reliably prevented.

  The present invention is not limited to the above-described embodiment. The present invention is not limited to an ink jet recording apparatus, but a recording head used in an image recording apparatus such as a printer, a color material ejecting head used in manufacturing a color filter such as a liquid crystal display, an organic EL display, and an FED (surface emitting). Electrode material ejection heads used for electrode formation such as displays), liquid ejection devices using liquid ejection heads that eject liquids such as bio-organic matter ejection heads used in biochip manufacturing, sample ejection devices as precision pipettes, etc. Applicable.

1 is a schematic perspective view showing an ink jet recording apparatus according to an embodiment of a liquid ejecting apparatus having a tube pump of the present invention. It is the schematic which shows the head cleaning mechanism etc. of FIG. It is the schematic which shows the main internal structures etc. of a tube pump. It is the schematic which shows the tube pump which concerns on the 2nd Embodiment of this invention. It is a schematic explanatory drawing which shows the state which the tube deform | transformed by the friction with the conventional roller member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Inkjet recording device, 20 ... Inkjet recording head, 100 ... Tube pump, 110 ... Tube, 111 ... Leak point, 120 ... Pulley, 120a ... Outer circumference of pulley Part 120b... Pulley body 121. Pulley central axis 130 rotating plate 131 guide groove 131a suction end 131b release end 150. Stepping motor, 160 ... Ring-shaped member, 160a ... Ring-shaped member inner peripheral part, 160b ... Ring-shaped member main body, 221 ... Pulley side tooth part, 261 ... Ring-shaped member side tooth Literature

Claims (6)

A tube part that sucks liquid and is formed in an annular shape;
A cylindrical abutting portion arranged to be movable along the tube portion;
A rotating part that moves the contact part along the tube part;
A motor unit for generating a moving torque for moving the abutting part along the tube part,
In the rotating part, a liquid suction part in which the contact part is arranged when the tube pump sucks liquid, and
A non-liquid suction part in which the contact part is arranged when the tube pump does not suck liquid;
A connecting portion capable of reciprocating the contact portion between the liquid suction portion and the non-liquid suction portion; and
The contact portion is formed with a rotating shaft portion that is movably disposed within the liquid suction portion, the non-liquid suction portion, and the connection portion,
The contact portion is a tube pump configured to rotate around the rotation shaft portion,
A ring-shaped member is formed between the tube portion and the abutting portion for leveling variation in load with respect to the moving torque,
An anti-slip portion is formed at least on the contact portion side and / or outside of the contact portion of the ring-shaped member.   The tube pump according to claim 1, wherein the non-slip portion is made of a material having a high friction coefficient.   The tube pump according to claim 1 or 2, wherein the anti-slip portion has a meshing shape formed on the contact portion side of the ring-shaped member and on the outside of the contact portion. The outer diameter of the ring-shaped member exceeds the outer diameter of the abutting portion, and is formed below the inner diameter of the tube portion,
The tube pump according to any one of claims 1 to 3, wherein the ring-shaped member is configured to move eccentrically toward the tube portion by pressing of the contact portion.   The tube according to any one of claims 1 to 4, wherein a leak portion that separates the contact portion and the tube portion is formed at a base end portion of the tube portion. pump. A tube part that sucks liquid and is formed in an annular shape;
A cylindrical abutting portion that is movably disposed along the tube portion; and a rotating portion that moves the abutting portion along the tube portion;
A motor unit for generating a moving torque for moving the abutting part along the tube part,
In the rotating part, a liquid suction part in which the contact part is arranged when the tube pump sucks liquid, and
A non-liquid suction part in which the contact part is arranged when the tube pump does not suck liquid;
A connecting portion capable of reciprocating the contact portion between the liquid suction portion and the non-liquid suction portion; and
The contact portion is formed with a rotating shaft portion that is movably disposed within the liquid suction portion, the non-liquid suction portion, and the connection portion,
The contact portion is a liquid ejecting apparatus having a tube pump configured to rotate around the rotating shaft portion,
In the tube pump, a ring-shaped member is formed between the tube portion and the abutting portion for leveling variation in load with respect to the moving torque,
An anti-slip portion is formed at least on the contact portion side and / or outside of the contact portion of the ring-shaped member.

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