JPH0520982Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to the dispensing mover structure of a metered dispensing device, and in particular, the mover can be easily moved by an annular protrusion that comes into contact only during dispensing operations. , relates to a discharging mover structure of a metered dispensing device that aims to improve fluid discharging accuracy.

[Conventional technology]

Generally, fixed-quantity dispensing devices use a highly viscous fluid such as an epoxy-based conductive resin or a paste-like material at room temperature, and discharge a predetermined amount of the fluid. Furthermore, epoxy-based conductive resins contain gold and silver and are expensive.

[Problem that the invention attempts to solve]

By the way, in conventional quantitative dispensing devices, when forming a discharging mover that discharges fluid during movement, the mover is formed to have an outer diameter slightly smaller than the inner diameter of the inner circumferential surface of the container. The outer circumferential portion of this mover was fitted into the container via a rubber O-ring.

As a result, when the slider moving inside the cylindrical container is moved to a predetermined position by air pressure, the slider constantly comes into contact with the inner peripheral surface of the container, resulting in a large frictional force. There is an inconvenience that the mover does not move smoothly and the fluid ejection accuracy decreases.

[Purpose of the invention]

Therefore, the object of this invention is to eliminate the above-mentioned inconveniences, in a constant-quantity dispensing device having a control unit, a movable element having a bottomed cylindrical expansion/contraction portion with one end closed in a curved shape is formed from an elastic member, and at least two annular protrusions are formed on the outer periphery of the expansion/contraction portion of the movable element, the expansion/contraction portion being expanded only during the dispensing operation to abut against the inner surface of the container, the outer periphery of the expansion/contraction portion having an outer periphery slightly smaller than the inner diameter of the container and intersecting the direction of movement of the movable element, thereby making it possible to easily move the movable element by the annular protrusions that abut only during the dispensing operation, thereby realizing a movable element structure for dispensing of a constant-quantity dispensing device which can improve the accuracy of dispensing fluid.

[Means for solving problems]

In a dispensing mover of a metered dispensing device, which has a control unit that controls discharging so as to move in a cylindrical container and discharge fluid when moving by air pressure, a dispensing mover for a metered dispensing device is a dispensing mover that moves in a cylindrical container and has a bottomed cylindrical shape with one end closed in a curved shape. The slider having an expansion/contraction portion is formed of an elastic member, and a peripheral portion of the expansion/contraction portion of the slider is provided with a portion so as to expand the expansion/contraction portion and come into contact with the inner circumferential surface of the container only during a discharge operation. The present invention is characterized in that at least two annular protrusions are formed that have an outer periphery that is slightly smaller than the inner diameter of the container and that intersect with the moving direction of the mover.

[Effect]

With the above configuration, air pressure is first supplied into the container to inflate the expansion/contraction section of the slider, and at least two annular protrusions formed on the outer circumference of the expansion/contraction section are sequentially formed on the inner peripheral surface of the container. When the discharging operation starts, the air pressure is increased to push the mover down toward the needle portion, and a predetermined amount of high viscosity fluid is discharged from the needle portion. As a result, the annular protrusion that comes into contact only during the discharging operation allows the mover to easily move, thereby improving the fluid discharging accuracy.

〔Example〕

Embodiments of this invention will be described in detail below based on the drawings.

1 to 3 show examples of this invention. In Figs. 1 to 3, 2 is a fixed quantity dispensing device, 4
1 is a container formed into a cylindrical shape, 6 is a mover that moves within the container 4, 8 is a needle portion connected to one end 4a side which is the discharge side of the container 4, and 10 is connected to the other end 4b side of the container 4. The connecting portion 12 is a control portion that controls and supplies air pressure into the container 4.

As shown in FIGS. 1 and 2, the movable element 6 is formed into a bottomed cylindrical shape with one end closed in a curved shape, and is made of an elastic member such as plastic. A rod-shaped convex portion 14 that matches the inner shape of the container 4 and discharges the entire amount of fluid is formed at the side tip 6a.

Further, at least two annular first protrusions 18a and two annular second protrusions 18b, for example, two annular protrusions 18a and 18b, are provided on the outer circumferential portion of the cylindrical expansion/contraction portion 16 of the slider 6, opposite to the closed end 6a. The annular first and second protrusions 1 are sequentially formed at a desired interval from the end side.
8a and 18b are formed to intersect the moving direction of the movable element 6, and the outer diameter S1 of the first annular projection 18a is formed to be slightly larger than the outer diameter S2 of the second annular projection 18b. Furthermore, the outer diameter S1 of the annular first protrusion 18a is formed to be slightly smaller than the inner diameter S3 of the inner peripheral surface 4f of the container 4. That is, the inner diameter S3 of the inner peripheral surface 4f of the container 4 and the annular first and second protrusions 18
The relationship between the outer diameters S1 and S2 of a and 18b is S3>
Set S1>S2.

Note that the reference numeral 20 is a space formed within the movable element 6.

Next, the effect will be explained.

First, the mover 6 is inserted into the container 4 of the quantitative dispensing device 2, the needle portion 8 and the connecting portion 10 are connected to the container 4, and a high viscosity fluid (not shown) is caused to flow into the container 4. At this time, the control unit 12 supplies air pressure between the mover 6 and the connecting portion 10 in the container 4, that is, into the space 20 of the mover 6, and as shown by the dashed line in FIG. 6 is inflated, and the first and second annular protrusions 18a and 18b are brought into contact with the inner circumferential surface 4f of the container 4 in sequence.

Then, at the time of starting the discharge work, the control section 12
The air pressure is thereby increased to push down the mover 6 toward the needle portion 8, and a predetermined amount of high viscosity fluid is discharged from the needle portion 8.

Further, when the remaining amount of high viscosity fluid in the container 4 becomes small, the rod-shaped convex portion 14 formed on the closed end 6a of the slider 6 removes the high viscosity fluid remaining in the container 4. The entire amount of fluid is discharged.

As a result, the annular protrusion that comes into contact with the inner peripheral surface of the container only during the dispensing operation allows the mover to be moved easily and smoothly before the dispensing operation, and the mover can be reliably positioned at a predetermined position. This makes it possible to improve the ejection accuracy.

Further, at least two
By sequentially forming the annular first and second protrusions, for example two annular protrusions, at a desired distance from the open end opposite to the closed end of the slider, the slider does not shake during dispensing operations. , which can contribute to improving the ejection accuracy.

Furthermore, since the entire amount of fluid in the container can be discharged by the rod-shaped convex portion, it is possible to prevent the fluid from remaining in the container, especially when using expensive epoxy-based conductors containing gold or silver. High viscosity fluids such as plastic resins are often used, which is economically advantageous.

It should be noted that this invention is not limited to the above-mentioned embodiments, and can be modified in various ways.

For example, in the embodiment of this invention, a rod-shaped convex portion for discharging the entire amount of fluid is formed at the end of the closed side of the slider, but a slider without a rod-shaped convex portion is formed, and the outer circumference of the slider is The annular protrusion formed at the portion allows the mover to move easily and smoothly before the discharging operation, thereby improving the discharging accuracy.

[Effect of idea]

As explained in detail above, according to this invention, in a fixed-quantity dispensing device having a control section, a mover having a bottomed cylindrical expanding and contracting part with one end closed in a curved shape is formed of an elastic member. , the outer periphery of the expansion/contraction part of the mover has an outer periphery slightly smaller than the inner diameter of the container so that the expansion/contraction part expands and comes into contact with the inner circumferential surface of the container only during the discharge operation, and the outer circumference is slightly smaller than the inner diameter of the container, and Since at least two intersecting annular protrusions are formed, the annular protrusions that come into contact with the inner circumferential surface of the container only during the dispensing operation make it possible to easily and smoothly move the slider before the dispensing operation, and to keep the mover in a predetermined position. It can be positioned reliably in the desired position, and the ejection accuracy can be improved. Further, by forming at least two annular protrusions on the outer circumference of the expansion/contraction portion of the mover, it is possible to prevent the mover from wobbling during the dispensing operation, which can contribute to improving the dispensing accuracy.

[Brief explanation of drawings]

Figures 1 to 3 show examples of this invention, Figure 1 is a schematic diagram of a metered dispensing device, Figure 2 is an enlarged sectional view of a mover moving inside a container, and Figure 3 is a mover towards a container. FIG. 3 is an enlarged cross-sectional view of a main part showing a state of contact. In the figure, 2 is a quantitative dispensing device, 4 is a container, 4
f is the inner peripheral surface, 6 is the slider, 8 is the needle portion, 10
12 is a control portion, 14 is a rod-shaped convex portion, 16 is a connecting portion, and 12 is a control portion.
18a is an annular first protrusion, and 18b is an annular second protrusion.

Claims (1)

[Scope of utility model registration request] In a dispensing mover of a metered dispensing device, which has a control unit that controls discharging so as to move in a cylindrical container and discharge fluid when moving by air pressure, a dispensing mover for a metered dispensing device is a dispensing mover that moves in a cylindrical container and has a bottomed cylindrical shape with one end closed in a curved shape. The slider having an expansion/contraction portion is formed of an elastic member, and a peripheral portion of the expansion/contraction portion of the slider is provided with a portion so as to expand the expansion/contraction portion and come into contact with the inner circumferential surface of the container only during a discharge operation. A dispensing mover structure for a fixed quantity dispensing device, characterized in that at least two annular protrusions are formed that have an outer circumference slightly smaller than the inner diameter of the container and intersect with the moving direction of the mover.