JPH07328497A - Liquid ejector - Google Patents

Abstract

PURPOSE:To prevent rotation of a cap and a plunger of a liquid ejector in the direction opposite to a rotational operation for sucking liquid and to keep an ejecting property with fixed quantity. CONSTITUTION:In the liquid ejector 10, a communicate path 101 where an inside surface of a pressurized chamber 17A in a pressurized chamber forming cylinder 17 is capable of being communicated the pressurized chamber 17A to a side of a liquid housing chamber 16A between the plunger 23 at the highest moving side and the inside surface, is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid ejector for ejecting a liquid in a container into a mist or a rod.

[0002]

2. Description of the Related Art Conventionally, as a liquid ejector, an actual flat panel 3-906 has been used.
There is one as described in Japanese Patent No. 64. This liquid ejector is configured by providing a container with a manual pump and extending a suction pipe connected to a suction passage of the manual pump to the bottom of the container.

Specifically, the container is provided with a liquid storage chamber forming portion which forms a liquid storage chamber and a pressure chamber forming portion which forms a pressure chamber. Also, the manual pump
Disposed in the suction passage provided in the pressure chamber forming portion of the container,
A suction check valve that allows the flow of the liquid from the liquid storage chamber to the pressurizing chamber, a cap that is rotatably connected around the pressurizing chamber forming portion of the container, a plunger guide provided on the cap, and the cap. Is engaged in the direction of rotation of, and is vertically moved so as to move up and down on the inner surface of the pressurizing chamber, and the upward movement expands the pressurizing chamber, and the downward movement expands the pressurizing chamber. A plunger that contracts and a cam engagement element provided on one side of the pressure chamber forming portion of the container and the plunger engages with a cam groove provided on the other side, and the cam engagement element cams when the plunger rotates in the forward direction. Plunger on the inclined cam surface of the groove Lower movement of the plunger from the operating end side to the upper side of the plunger The relative movement of the plunger moves the plunger upward in a spiral rotation, causing the cam engaging element to move upward on the plunger on the vertical cam surface of the cam groove. From the moving operation end side to the plunger lower moving operation end side Cam device that moves the plunger downward by moving the plunger relative to each other, the ejection head having the ejection passage, the discharge valve interposed between the communication passage communicating with the pressurizing chamber and the ejection passage of the ejection head, and the plunger downward. And a pressurizing device for pressurizing the pressurizing chamber by urging in the moving direction.

Thus, (1) when the plunger is rotated in the forward direction by the cap, the plunger is moved upward in a spiral rotation along the inclined cam surface of the cam groove to store the liquid in the pressurizing chamber. The liquid in the pressurizing chamber is maintained under pressure by sucking the liquid in the chamber and urging the plunger reaching the upper end in the downward direction by the pressurizing device.
(2) When the discharge valve is opened, the pressurizing device ejects the liquid in the pressurizing chamber, which is in a pressurized state, from the ejection passage of the ejection head, and the pressurizing device causes the plunger to move to the vertical cam surface of the cam groove. Then, the plunger is moved down along with it, and the plunger is returned to the lower end to be on standby to prepare for the next liquid suction operation.

Here, in the prior art, as shown in FIG.
Vertical groove 1 in which the cam engaging element is formed in the pressure chamber forming portion of the container
And a ball 6 that can be fitted into the cam groove 3 formed in the plunger 2 in each half. The cam groove 3 is formed by continuously forming an inclined cam groove 4 having an inclined cam surface 4A and a vertical cam groove 5 having a vertical cam surface 5A in an N-shape.

Therefore, when the liquid ejector is in use, the plunger 2 is displaced as shown in FIGS. 6 (A) and 6 (B).

(A) Before liquid suction (at the end of liquid ejection) (Fig. 6)
(A)) When the plunger 2 is rotated clockwise (forward direction of the plunger rotation operation), the plunger 2 follows the inclined cam surface 4A of the inclined cam groove 4 by the engagement of the cam groove 3 and the ball 6 as described above. It moves upward in a clockwise spiral rotation and sucks the liquid into the pressure chamber.

(B) At the end of liquid suction (before liquid ejection) (Fig. 6)
(B)) The plunger 2 engages with the ball 6 in the retaining groove 7 provided at the intersection of the plunger moving operation end of the inclined cam surface 4A and the plunger moving operation end of the vertical cam surface 5A. The operator is informed that it cannot rotate to the right, reaches the upper end, and has finished sucking in the prescribed amount of liquid.

(C) At the time of jetting the liquid (FIG. 6 (A)) When the discharge valve is opened, the liquid under pressure in the pressurizing chamber is jetted from the jet passage of the jet head as described above.
At this time, the plunger 2 receives the biasing force of the pressurizing device and moves downward along the vertical cam surface 5A of the vertical cam groove 5 by the engagement of the cam groove 3 and the ball 6 as described above.

When all the prescribed amount of liquid sucked by the upward movement of the plunger 2 has been ejected, the plunger 2 reaches the lower end (FIG. 6 (A)). At this time, the plunger 2 moves the ball 6 at the intersection of the plunger lowering operation end of the vertical cam surface 5A and the plunger lowering operation end of the inclined cam surface 4A.
Then, the state in which the liquid can be rotated to the right, that is, the state in which the liquid can be sucked in (A) described above, stands by for the next liquid suction.

[0011]

However, in the prior art, the plunger 2 can be rotated counterclockwise (opposite to the plunger rotation operation) by the rotation operation applied to the cap at the end of the liquid suction described in (B) above. It may not be possible to jet a fixed amount when the liquid of (C) above is jetted. Hereinafter, this will be described in detail.

At the end of the liquid suction of the above (B), the plunger 2
Cannot rotate to the right due to the existence of the retaining groove 7, but can rotate to the left. When it is rotated counterclockwise, it becomes as shown in FIG. That is, the liquid is contained in the pressurizing chamber and the plunger 2
Due to the friction between the cylinder portion 17 and the cylinder portion 17, the plunger 2 cannot move downward and rotates horizontally. At this time, since the ball 6 is in the vertical groove 1, it is guided by the inclined cam groove 4 to move upward, and every time the plunger 2 rotates 180 degrees counterclockwise, the ball 6 falls in the vertical cam groove 5 and is guided to the inclined cam groove 4 again. The operation of being moved and moving up is repeated. Then, when the above-described left rotation of the plunger 2 is stopped at an arbitrary position, the ball 6 moves in the middle of the inclined cam groove 4 as shown in FIG.
It will stop as shown in (C).

When the discharge valve is opened to eject the liquid while the ball 6 stays in the middle of the inclined cam groove 4, the plunger 2 moves the distance H2 shown in FIG. Only the distance to drop the inside) can be moved downward (during normal liquid discharge of the above-mentioned (C), the plunger 2 can move the distance H1 in FIG. 6 (A)). Originally, the plunger 2 should move by a distance of H2 and then move downward along the inclined cam surface 4A by the engagement between the inclined cam groove 4 and the ball 6 while moving downward toward the lower end. However, it stops due to the friction between the inclined cam groove 4 and the ball 6. When using this liquid ejector (jetting operation), place your finger on the upper part of the liquid ejector,
That is, since the liquid ejector is gripped by the cap 22 and the pressurizing chamber forming cylinder 17 and the like located below the cap 22, the plunger 2 connected to the cap 22 via the rotating body 32 cannot rotate as a result. . For this reason, it is not possible to eject all of the prescribed ejection amount in the pressurizing chamber, and only only a portion thereof can be ejected.

It is an object of the present invention to prevent the cap and the plunger from rotating in a direction opposite to the liquid suction rotating operation in the liquid ejecting device, and to secure a constant ejecting property.

[0015]

The present invention provides a container having a liquid storage chamber forming portion forming a liquid storage chamber and a pressure chamber forming portion forming a pressure chamber, and a pressure chamber forming portion of the container. A suction check valve which is disposed in the suction passage provided and allows the liquid to flow from the liquid storage chamber to the pressurizing chamber, a cap which is rotatably coupled around the pressurizing chamber forming portion of the container, and a cap. To the plunger guide provided in the direction of rotation of the cap, is vertically movable to be guided vertically to move up and down the inner surface of the pressurizing chamber, and the upward movement expands the pressurizing chamber, The plunger that contracts the pressurizing chamber by its downward movement, and the cam engaging element provided on one of the pressurizing chamber forming portion of the container and the plunger engages with the cam groove provided on the other of them, and moves in the forward direction of the plunger. When rotating the, move the cam engagement element from the plunger lower operation end side of the inclined cam surface of the cam groove. The plunger is moved upward in a spiral rotation by moving it relatively toward the upper operating end side, and the cam engagement element is directed from the plunger upper operating end side of the vertical cam surface of the cam groove to the lower plunger operating end side. Cam device that moves the plunger downward by moving it relative to
The ejection head including the ejection passage, the discharge valve interposed between the communication passage connected to the pressurization chamber and the ejection passage of the ejection head, and the plunger are urged downward to pressurize the pressurization chamber. A pressurizing device having a pressurizing device, which is expanded by spirally moving the plunger upward along the inclined cam surface of the cam groove when the plunger is rotated in the forward direction by the cap. Liquid in the pressurizing chamber, which is in a pressurized state by the pressurizing device at the time of opening the discharge valve, is ejected from the ejection passage of the ejection head, and the pressurizing device causes the plunger to move to the vertical cam surface of the cam groove. In the liquid ejector that is moved downward along the inner surface of the pressurizing chamber of the pressurizing chamber forming portion, a communication passage that allows the pressurizing chamber to communicate with the liquid storage chamber is formed between the pressurizing chamber forming portion and the plunger at the uppermost moving end. It is made to be formable.

[0016]

[Operation] When the plunger is rotated in the forward direction by the cap, the plunger moves upward in a forward spiral direction along the inclined cam surface due to the engagement between the cam groove and the cam engaging element (ball), and is applied. Inhale the liquid into the pressure chamber.

When the plunger reaches the uppermost moving end at the end of sucking the liquid, a communication passage is formed between the plunger and the inner surface of the pressurizing chamber for connecting the pressurizing chamber to the liquid storage chamber side. The pressurized liquid in the pressure chamber can be returned to the liquid storage chamber side. Therefore, the plunger is slightly moved downward by the urging force of the pressurizing device to the position where the communication passage is closed, and the pressurized liquid in the pressurizing chamber is returned to the liquid storage chamber side.

After the plunger slightly moves down to the position where it closes the communication passage as described above, the liquid in the pressurizing chamber does not escape, so that the plunger cannot move down. At this time, the cam engaging element slightly enters the vertical cam groove of the cam groove of the plunger, and the plunger cannot rotate in the forward or reverse direction. Therefore, when the liquid is ejected at the end of liquid absorption, the cam engagement element smoothly moves relative to the vertical cam surface of the cam groove, and the plunger always moves downward by a constant downward movement stroke corresponding to the prescribed ejection amount to reliably eject a fixed amount. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing an example of a liquid ejector showing a state before liquid suction, FIG. 2 is a schematic diagram showing an intermediate state of liquid suction, and FIG. 3 is a schematic diagram showing a state immediately before the end of liquid suction. 4, FIG. 4 is a schematic diagram showing a liquid ejection state, FIG. 5 is a schematic diagram showing displacement of the plunger according to the present invention, and FIG. 6 is a schematic diagram showing displacement of the plunger according to the conventional example.

As shown in FIGS. 1 to 4, the liquid ejector 10 includes a container 11 provided with a manual pump 12 and a manual pump 12
The suction pipe 14 connected to the suction passage 13 extends to the bottom portion 15 of the container 11. Thereby, in the liquid ejector 10, the liquid in the container 11 can be sucked by the manual pump 12 and ejected in the form of a mist or a rod.

The container 11 is provided with a bottomed cylindrical liquid storage chamber forming cylinder 16 forming a liquid storage chamber 16A and a pressure chamber forming cylinder 17 forming a pressurizing chamber 17A. The female screw portion 17B provided on the outer peripheral skirt portion of the pressurizing chamber forming cylinder 17 is screwed to the male screw portion 16B provided on the outer peripheral portion of the upper end of the above, thereby being integrated. A packing 18 is provided at a connecting portion between the liquid storage chamber forming cylinder 16 and the pressurizing chamber forming cylinder 17.
In the pressure chamber forming cylinder 17, a lower end cylinder portion 17C forms a pressure chamber 17A, and the suction passage 13 is provided at the lowermost end of the cylinder portion 17C.

The manual pump 12 has a suction check valve 21, a cap 22, a plunger 23, a cam device 24, an ejection head 25, a discharge valve 26, and a pressurizing device 27. There is.

The suction check valve 21 is arranged in the aforementioned suction passage 13 provided in the cylinder portion 17C of the pressurizing chamber forming cylinder 17 in the container 11. That is, the ball seal 31 is engaged with the suction passage 13, and the ball-shaped suction check valve 21 is seated on the ball seal 31 so that the liquid storage chamber 16A
The flow of liquid from the pressure chamber 17A to the pressure chamber 17A is allowed.

The cap 22 is rotatably coupled around the pressurizing chamber forming cylinder 17 by being attached to a lower flange 17D provided at an intermediate portion of the outer periphery of the pressurizing chamber forming cylinder 17 of the container 11. There is. The cap 22 includes a rotating body 32 so as to be integrally rotatable. The rotating body 32 is integrated with the cap 22 in the rotating direction inside the cap 22 through the concave-convex engaging portion 33, and is an upper flange provided near the outer peripheral upper end of the pressurizing chamber forming cylinder 17 of the container 11. By being attached to the cap 17E, the cap 22 is rotatably coupled around the pressurizing chamber forming cylinder 17 and is rotated by the rotational operation force applied to the cap 22.
Rotates together with.

The plunger 23 is fitted into the pressurizing chamber forming cylinder 17 of the container 11 and is attached to the plunger guide 32A provided on the rotating body 32 which is integral with the cap 22 as described above. And is vertically movable so as to move up and down in the pressurizing chamber 17A, the pressurizing chamber 17A is expanded by its upward movement, and the pressurizing chamber 17A is contracted by its downward movement. To do. At this time, the plunger 23 allows the hollow tip portion 23A to penetrate into the inner surface of the cylinder portion 17C, and the plunger ring 34 is integrally fitted to the leading end surface and the inner surface of the hollow tip portion 23A. The portion 34A is in sliding contact with the inner surface of the cylinder portion 17C. Further, the packing retainer 35 is provided on the upper inner peripheral portion of the cylinder portion 17C of the pressurizing chamber forming cylinder 17.
A rubber packing 36 held by is provided, and the rubber packing 36 is adapted to slidably contact the outer surface of the hollow tip portion 23A of the plunger 23 in a liquid-tight manner. Then, the rubber packing 36 of the cylinder portion 17C in the pressurizing chamber forming cylinder 17
A through hole 37 is provided immediately below, and a negative pressure release valve 38 is mounted around the through hole 37 of the pressurizing chamber forming cylinder 17. The function of the negative pressure release valve 38 (two functions of the negative pressure release function of the liquid storage chamber 16A and the residual pressure release function of the pressurization chamber 17A) will be described later.

The plunger 23 has a hollow tip 23.
A ring-shaped shock absorbing plate 39 made of a shock absorbing material is provided around the upper end portion of A, and when the plunger 23 reaches the lower end, the lower surface of the shock absorbing plate 39 serves as a cushion for the upper end surface of the rubber packing 36. It is decided to make a meeting with.

The cam device 24 has two cam engaging elements 41 provided at two positions in the diametrical direction of the inner peripheral portion of the pressurizing chamber forming cylinder 17 in the container 11 and a cam groove provided on the outer peripheral portion of the plunger 23. 42 (FIG. 2 (B)). The cam device 24 is (a) the plunger 2
When 3 is rotated in the clockwise direction (forward rotation operation direction), the cam engagement element 41 is relatively moved from the plunger lower operation end side of the inclined cam surface 42A of the cam groove 42 toward the plunger upper operation end side. By doing so, the plunger 23 is moved upward in a spiral rotation. Further, the cam device 24 (b) moves the cam engaging element 41 relative to the vertical cam surface 42B of the cam groove 42 from the plunger upper operation end side toward the plunger lower operation end side, thereby lowering the plunger 23. To move.

The ejection head 25 is provided on the upper end portion of a discharge valve 26, which will be described later, so as to be capable of being pushed, and has an ejection passage 46 connected to the nozzle tip 45.

The discharge valve 26 is interposed between the communication passage 47 connected to the pressurizing chamber 17A and the ejection passage 46 of the ejection head 25, and is opened by the pushing operation of the ejection head 25.

Here, the discharge valve 26 holds the valve housing 26B in the mountain cup 26A attached to the inner peripheral portion of the upper end side of the cap 22, and the stem packing is provided between the mountain cup 26A and the valve housing 26B. 26C is sandwiched, and the valve stem 26 is attached to the stem packing 26C.
Supports D's neck. In the valve stem 26D, a valve body 26E provided under the neck is pressed against a stem packing 26C by a valve spring 26F, and a passage 26H communicating with a slit 26G (FIG. 4 (B)) provided in the neck is provided at the upper end. The jet head 25 is joined to the upper end of the jet head 25 via a valve attachment 48. The cap 2 is provided around the lower end of the valve housing 26B of the discharge valve 26.
The connecting pipe 49 attached to the rotating body 32 integrated with the liquid pipe 2 is liquid-tightly mounted, and the tip end of the connecting pipe 49 is the plunger 23.
Is liquid-tightly inserted into the plunger ring 34. The connecting pipe 49 and the valve housing 26B are connected to each other by the connecting passage 4 described above.
Form 7.

The discharge valve 26 is closed by (A) the valve spring 26F pressing the valve body 26E against the stem packing 26C. Further, the discharge valve 26 (b) pushes down the valve stem 26D by a pushing operation applied to the ejection head 25 to separate the valve body 26E from the stem packing 26C and push the stem packing 26 open to open the valve stem 2
The slit 26G provided at the neck portion of 6D is opened by facing the inside of the valve housing 26B.

The pressurizing device 27 is composed of a spring 51 interposed between the rotary body 32 integral with the cap 22 and the plunger 23 around the intermediate portion of the connecting pipe 49. The pressure device 27 causes the plunger 2 to move by the spring force of the spring 51.
The pressurizing chamber 17A is pressurized by urging 3 in the downward direction.

However, the liquid jetting device 10 (1) moves the plunger 23 upward in a spiral rotation along the inclined cam surface 42A of the cam groove 42 when the plunger 23 is rotated clockwise by the cap 22. By sucking the liquid in the liquid storage chamber 16A into the pressurizing chamber 17A that is expanded by, the spring 23 of the pressurizing device 27 biases the plunger 23 reaching the upper moving end in the downward moving direction. Pressurization chamber 17 sealed by suction check valve 21 and discharge valve 26
The liquid in A is maintained under pressure. And (2) ejection head 25
By opening the discharge valve 26 by the pushing operation added to
The liquid in the pressurizing chamber 17A in a pressurized state is jetted by the pressurizing device 27 from the jet passage 46 of the jet head 25, and the plunger 23 is moved downward by the pressurizing device 27 along the vertical cam surface 42B of the cam groove 42. This is to prepare for the next liquid suction operation by moving the plunger 23 to return to the lower end and waiting.

The cam engagement element 41 has vertical grooves 52 formed at two positions of the inner peripheral portion of the pressurizing chamber forming cylinder 17 of the container 11 and a cam groove 42 formed on the outer peripheral portion of the plunger 23. It is composed of balls that can be fitted with one and a half of each.

Here, the manual pump 12 of the liquid ejector 10 is used.
In this case, the inner surface of the cylinder portion 17C forming the pressurizing chamber 17A of the pressurizing chamber forming cylinder 17 is applied between the tip end lip portion 34A of the plunger ring 34 of the plunger 23 at the uppermost moving end. It is possible to form a communication passage 101 that connects the pressure chamber 17A to the liquid storage chamber 16A side. In this embodiment, the inner diameter of the cylinder portion 17C near the upper end is made slightly larger than the outer diameter of the tip lip portion 34A so that the two do not come into close contact with each other and the annular communication passage 101 is formed between the two.
7A from this communication passage 101 through hole 37, negative pressure release valve 38
It is possible to communicate with the liquid storage chamber 16A via the.

However, a groove is provided in a part of the inner surface of the cylinder portion 17C near the upper end in the circumferential direction, and the groove forms the communication passage 10 described above.
It is also possible to form one equivalent portion.

At the intersection of the upper plunger operation end of the inclined cam surface 42A and the upper plunger operation end of the vertical cam surface 42B, the cam engagement is made in the clockwise direction of the plunger 23 (forward rotation operation direction). A retaining groove 42D is formed to prevent the right rotation of the plunger 23 by the engagement of the joint element 41.

Therefore, the liquid ejector 10 operates as follows (FIGS. 1 to 5). (A) Before liquid suction (at the end of liquid ejection) (FIGS. 1 and 5 (A)) The plunger 23 is biased by the pressure device 27 and is positioned at the lower end of the pressure chamber 17A.

(B) Liquid suction operation (FIG. 2) When the cap 22 is rotated to the right (forward direction of the plunger rotation operation), the rotating body 32 rotates integrally with the cap 22, and the plunger 23 moves the plunger guide 32A of the rotating body 32. It is rotated clockwise by the engagement with. At this time, the plunger 23 moves upward in the pressurizing chamber 17A in a clockwise spiral rotation along the inclined cam surface 42A due to the engagement of the cam engaging element 41 and the cam groove 42, and is added from the inside of the liquid storage chamber 16A. Pressure chamber 1
Inhale liquid into 7A. The liquid in the liquid storage chamber 16A is sucked up from the bottom portion 15 of the container 11 via the suction pipe 14.

(C) Immediately before the end of liquid suction (FIGS. 3 and 5 (B)) When the cap 22 is rotated by 180 degrees (specified rotation amount), the plunger 23 is perpendicular to the plunger upper operation end of the inclined cam surface 42A. The cam engaging element 41 is formed in the retaining groove 42D provided at the intersection of the cam surface 42B and the plunger upper operation end.
And cannot rotate further to the right and reaches the uppermost moving end (full upward moving stroke H1). When the plunger 23 reaches the uppermost moving end, the tip lip portion 34A of the plunger 23
And the inner surface of the cylinder portion 17C of the pressurizing chamber forming cylinder 17,
Communication path 1 that connects the pressurizing chamber 17A to the liquid storage chamber 16A side
01 opens. Therefore, the plunger 23 is slightly moved downward by the spring force of the spring 51 of the pressurizing device 27 to the position where the communication passage 101 is closed (H2), and the pressurized liquid in the pressurizing chamber 17A is passed through the through hole 37 and the negative pressure is released. Return from the valve 38 to the side of the liquid storage chamber 16A.

(D) At the end of liquid suction (before liquid ejection) (Fig. 5)
(C) Due to the above (C), after the plunger 23 slightly moves down to the position where the communication passage 101 is closed, the liquid in the pressurizing chamber 17A does not escape, so the plunger 23 cannot move down. At this time, the cam engaging element 41 slightly enters the vertical cam surface 42B of the cam groove 42 of the plunger 23, the plunger 23 cannot rotate in the forward direction or the reverse direction, and reaches the upper end to reach the prescribed ejection amount. Notify the operator that the suction of the liquid has been completed. At this time, the spring 51 of the pressure device 27 contracts,
The plunger 23 is urged downward, but the pressure chamber 17A
Is sealed by a suction check valve 21 and a discharge valve 26,
The plunger 23 keeps pressurizing the pressurizing chamber 17A at the upper moving end, and the pressurized liquid is not ejected.

The suction of liquid in the pressurizing chamber 17A causes a negative pressure in the liquid storage chamber 16A. As described above, when the liquid suction operation is performed, the plunger 23 moves upward, and immediately before the end of the liquid suction, the relief groove 62 (FIG. 2 (B)) formed on the outer surface of the hollow tip portion 23A of the plunger 23. The air on the outer peripheral side of the plunger 23, which is opposed to the rubber packing 36 and is connected to the atmosphere, passes through the escape groove 62, the inner periphery of the cylinder portion 17C of the pressurizing chamber forming cylinder 17, the through hole 37, and the negative pressure release valve 38.
To enter the liquid storage chamber 16A. As a result, the negative pressure in the liquid storage chamber 16A is released.

(E) At the time of jetting the liquid (FIG. 4) When the jet head 25 is pushed to open the discharge valve 26, the liquid under pressure in the pressurizing chamber 17A passes through the communication passage 47 and the jet head. It spouts from the spout passage 46 of 25. At this time, the cam engagement element 41 smoothly moves relative to the vertical cam surface 42B of the cam groove 42, and the plunger 23 always moves downward by a constant downward movement stroke (H3) commensurate with the prescribed ejection amount to surely eject a fixed amount.

When the prescribed amount of liquid sucked by the upward movement of the plunger 23 is completely ejected, the plunger 23
Reaches the lower end. The cylinder portion 17C, which is in sliding contact with the tip lip portion 34A of the plunger ring 34 provided on the plunger 23, is formed as the enlarged diameter portion 61 at the lower moving end corresponding portion of the plunger 23. As a result, when the plunger 23 reaches the lower end, the residual pressure in the pressurizing chamber 17A is reduced by the tip lip portion 34A of the plunger ring 34 and the cylinder portion 1.
It escapes to the outside of the pressurizing chamber 17A at once from between the expanded diameter portion 61 of 7C and the jetted liquid is good. The residual pressure that escapes to the outside of the pressurizing chamber 17A is released to the liquid storage chamber 16A via the through hole 37 of the pressurizing chamber forming cylinder 17 and the negative pressure release valve 38.

At this time, the plunger 23 is attached to the vertical cam surface 4
A state in which the cam engaging element 41 is engaged with the retaining groove 42D provided at the intersection of the plunger lowering operation end of 2B and the plunger lowering operation end of the inclined cam surface 42A, and the right rotation can be continued.
That is, the liquid suction state (A) described above is set and the apparatus waits for the next liquid suction.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific constitution of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention. Even if it exists, it is included in the present invention. For example, in the cam device, the cam engaging element may be provided on the plunger and the cam groove may be provided on the pressurizing chamber forming portion of the container.

[0047]

As described above, according to the present invention, in the liquid ejecting device, it is possible to prevent the cap and the plunger from rotating in the direction opposite to the liquid suction rotating operation, and ensure the fixed amount ejecting property.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a liquid ejector and showing a state before liquid suction.

FIG. 2 is a schematic diagram showing a liquid suction intermediate state.

FIG. 3 is a schematic diagram showing a state immediately before the end of liquid suction.

FIG. 4 is a schematic diagram showing a liquid ejection state.

FIG. 5 is a schematic diagram showing displacement of the plunger according to the present invention.

FIG. 6 is a schematic diagram showing displacement of a plunger according to a conventional example.

[Explanation of symbols]

 10 Liquid Ejector 11 Container 16 Liquid Storage Chamber Forming Cylinder 16A Liquid Storage Chamber 17 Pressurizing Chamber Forming Cylinder 17A Pressurizing Chamber 17C Cylinder Part 21 Suction Check Valve 22 Cap 23 Plunger 24 Cam Device 25 Spout Head 26 Discharge Valve 27 Pressurization Device 32A Plunger guide 34A Tip lip 41 Cam engaging element 42 Cam groove 42A Inclined cam surface 42B Vertical cam surface 101 Communication path

Claims (1)

[Claims] 1. A container having a liquid storage chamber forming portion forming a liquid storage chamber and a pressure chamber forming portion forming a pressure chamber, and a suction passage provided in the pressure chamber forming portion of the container. ,
A suction check valve that allows the flow of liquid from the liquid storage chamber to the pressurizing chamber, a cap that is rotatably coupled around the pressurizing chamber forming portion of the container, a plunger guide provided on the cap, and the cap. Is engaged in the direction of rotation of, and is vertically moved so as to move up and down on the inner surface of the pressurizing chamber, and the upward movement expands the pressurizing chamber, and the downward movement expands the pressurizing chamber. A contracting plunger, and a cam engaging element provided on one of the pressure chamber forming portion of the container and the plunger engages with a cam groove provided on the other of the plunger,
When the plunger is rotated in the forward direction, the cam engagement element is moved relative to the inclined cam surface of the cam groove from the plunger lower operation end side toward the plunger upper operation end side to move the plunger upward in a spiral rotation manner. A cam device for moving the plunger downward by relatively moving the cam engagement element from the plunger upper operation end side of the vertical cam surface of the cam groove toward the plunger lower operation end side; and an ejection head having an ejection passage, A discharge valve interposed between a communication passage connected to the pressurizing chamber and the jetting passage of the jet head; and a pressurizing device for pressurizing the pressurizing chamber by urging the plunger downward. When the plunger is rotated in the forward direction by the cap, the plunger is moved upward in a spiral rotation along the inclined cam surface of the cam groove, and the liquid is sucked into the pressure chamber, which is expanded. When the discharge valve is opened, the pressurizing device ejects the liquid in the pressurizing chamber, which is in a pressurized state, from the ejection passage of the ejection head, and the pressurizing device causes the plunger to move downward along the vertical cam surface of the cam groove. In the liquid ejector, the inner surface of the pressurizing chamber of the pressurizing chamber forming part can form a communication passage that allows the pressurizing chamber to communicate with the liquid storage chamber side between the uppermost moving end and the plunger. Liquid ejector characterized by.