JP3302629B2 - Handheld negative pressure suction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held negative pressure suction device used for lifting small articles by negative air pressure, and more particularly, to a method of boiling a small fish and lightly drying it to produce a product called shirasu. Also, the present invention relates to a device suitable for use in picking up and releasing an article having some stickiness due to moisture.

[0002]

2. Description of the Related Art In general, it is well known to use a negative pressure type hand-held suction device connected to a negative pressure pump as means for gripping a small electronic component such as an IC chip. This type of suction tool is composed of a rod-shaped member having a small opening serving as a suction port at the tip, and connects the opening and the negative pressure pump via an on-off valve operated by a push button type or a trigger type operator. When the IC chip or the like is sucked, the on-off valve is opened and sucked into the opening, and when the use is completed, the on-off valve is closed to cut off the negative pressure and release the parts. However, the structure was complicated. On the other hand, dried whitebait is made of only small white fish, but when it is pulled out of the sea, it may be mixed with small mackerel, small black fish or red shrimp of a different color, or broken whitefish (hereinafter simply referred to as foreign matter). . When fish other than such white fish are mixed, the quality of the product is reduced and the market value is reduced. Therefore,
Conventionally, when the dried shirasu was completed, it was necessary to remove the contaminants. That is, hangs are scattered thinly on a belt conveyor, inspected visually while moving, and when foreign matter is found, it is removed with tweezers.

[0003]

However, when a foreign substance mixed with white fish is taken out with tweezers, the white fish, which is a product, may be damaged, or the foreign substance may be too strongly pinched and cut and dropped on the product again. There was a problem to do. Therefore, instead of using tweezers, when a negative pressure type suction tool, which has been widely used in the electronic component industry, was used, it was possible to take out foreign substances without damaging the product. At the time of removal, even if the negative pressure was released to release the foreign substance once sucked up, if the foreign substance contained a lot of water, it adhered to the suction port of the suction tool, and each time it had to be removed. .

[0004]

An object of the present invention is to provide a rod-shaped hollow grip and a hollow suction tube connected to a tip of the grip at a predetermined angle, and a series of hollow grips and a suction tube inside the suction tube. While forming a negative pressure duct,
An opening serving as a suction port is provided at a tip portion of the suction tube, and a rod-shaped valve body that advances and retreats into the opening is supported inside the suction tube,
When the valve body is at the forward end, the front end is formed so as to be able to protrude forward of the suction tube through the opening, and the valve body forming the on-off valve has a front end portion inserted into the opening and a grip. A coil spring, which is constituted by a rear end portion provided with an operator and supported by the formed small hole, and a large-diameter portion formed between both end portions, and is contracted between the suction tube and the large-diameter portion. This is solved by configuring the valve as a normally open valve which is normally biased in the valve opening direction.

[0005]

The on-off valve is provided on a suction tube having an opening, and the suction tube and the grip are made hollow, and the inside is a series of negative pressure ducts for connecting a negative pressure source to the opening. The on-off valve is normally opened by the coil spring, that is, the valve body retreats to a position where the opening which is the suction opening is opened, and the negative pressure spreads to the opening end of the adsorption pipe when the negative pressure source is operating, If there is foreign matter near the opening, it will be adsorbed to the tip of the suction tube. When the on-off valve is closed against the coil spring, the valve element moves forward to close the opening, which is the suction port, and the tip of the advanced valve element passes through the opening and protrudes to the outside of the suction pipe. If foreign matter is attached to the tip of the suction tube, push it away.
The valve body forming the on-off valve is slidably supported in the axial direction by a grip and a suction tube forming a negative pressure duct. An openable and closable valve is formed between one end of the valve body and an opening formed in the suction pipe, and the open / close valve is normally operated by a coil spring contracted between the suction pipe and the valve body. It is opened.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to the present application will be described below with reference to the illustrated embodiments. 1 and 2, reference numeral 10 denotes a negative pressure suction unit, which is specifically a pencil type. The pencil-shaped negative pressure suction unit 10 has a grip 13 supported between the thumb 11 and the middle finger 12 of the right hand R.
On the upper surface of 3, there is provided an operating element comprising a push plate 15 for switching between suction and release by the index finger 14. 18
Is a relief hole for minimizing the protrusion of the operation element 15.

The grip 13 is made of synthetic resin and is formed hollow so as to be easily gripped by a fingertip. A front end 13b having a diameter is provided, and both are screwed so as to be separable. Although this configuration is not essential, the coloring of the rear end portion 13a and the front end portion 13b of the grip can be changed, so that a variety of products can be designed. Reference numeral 16 denotes a support portion inclined at an angle of about 30 ° to the end of the front end portion 13b, and a suction tube 20 described later is pressed into a hole 13d formed therein. 1
Reference numeral 7 denotes a connection pipe formed at the tail end of the rear end 13a, which is connected to a negative pressure pump (not shown) as a negative pressure source via a synthetic resin pipe (not shown). Thus, from the rear end 13a forming the grip 13 to the front end 13
b, a series of negative pressure ducts 19 are formed inside to the suction pipe 20.

As shown in FIGS. 3 and 4, the suction tube 20 has a generally bullet shape in which the tip is formed into a small diameter by a synthetic resin. That is, a curved surface swelling outward is formed between a relatively small diameter end portion and a thick body portion supported by the suction tube 20. An end face of the tip forms an adsorbing surface 21, and an opening 23 serving as a suction port for adsorbing a foreign substance 22 as an object to be adsorbed is formed. The large-diameter trunk portion is relatively firmly and separably press-fitted into a hole 13d formed at the front end of the support portion 16 to form the series of negative pressure ducts 19 described above. The inner surface of the suction tube 20 has the inside of the opening 23 expanded along the outer surface, and a step portion described later is formed between the inside of the opening 23 and the opening 23. Thus, a series of air passages from the opening 23 to the inside of the suction pipe 20 and to the connecting pipe portion 17 via the negative pressure duct 19 are constituted by parts made of synthetic resin. The means for connecting the suction tube 20 to the support portion 16 is not limited to press-fitting, but may be bonded.

The on-off valve 24 is formed by the opening 23 formed on the inner surface of the suction tube 20 forming the negative pressure duct 19 and the valve body 25 inserted therethrough. The valve body 25 is made of a hard copper alloy into an elongated rod shape. That is, a front end portion having a frusto-conical tapered portion 25b inserted into the opening 23 and a small hole 1 formed in the grip 13
It has a rear end supported by 3c, between which a large diameter portion 25a is formed. Reference numeral 26 denotes a coil spring, which is contracted between the step formed on the suction tube 20 and the end of the large diameter portion 25a. Further, the rear end of the valve body 25 projects outside through a small hole 13c provided in the grip, and the push plate 15 is separably connected thereto. Thus, the valve body 25 is repelled by the coil spring 26, and retreats to a position where the end of the large-diameter portion 25a contacts the bottom of the hole 13d formed in the support portion 16. At this time, the opening 23
An air-permeable annular space is formed between the inner diameter of the tapered portion 25b and the tapered portion 25b.

When the pressing plate 15 is pressed from this state, the valve body 25 is moved from the position shown in FIG. 4, that is, from the position shown by the two-dot chain line in FIG. And the small diameter portion of the tapered portion 25 b further advances in the opening 23. As a result, the opening 23 is
5 and the valve body 25 reaches the advancing end, the tip of the tapered portion 25b penetrates the opening 23 and protrudes to the outer surface of the suction tube 20.

Next, the operation of the embodiment will be described. The vacuum suction unit 10 shown in FIG. 4 is in a state where the on-off valve 24 is open, that is, in a free state, and the valve body 25 is at a position retracted from the opening 23 by the coil spring 26. That is, a slight taper portion 25 b that forms the tip of the valve body 25 remains in the opening 23, and a gap is formed between the outer periphery and the opening 23. When a negative pressure spreads through the negative pressure duct 19 from a negative pressure source (not shown) from this state, the outside air is
3. Therefore, the suction surface 21
Is brought closer to the foreign substance 22, the foreign substance 22 is adsorbed to the adsorption surface 21 by the pressure difference acting on the front and back of the foreign substance 22.

In order to separate the foreign matter 22 once adsorbed,
The push plate 15 is pressed against the coil spring 26 with the index finger while the grip 13 is held with the finger. Thereby, the valve element 2
5 advances into the opening 23 along its axis, and firstly, the negative pressure acting on the foreign matter 22 is cut off. At this time, if the foreign matter 22 to be adsorbed is moist, the separation may not be performed from the adsorbing surface 21 by simply removing the negative pressure. However, when the push plate 15 is further pressed, the valve body 25 is moved forward. And its tip projects outside from the opening 23. The protruding portion pushes the foreign substance 22 away from the suction surface 21, and the foreign substance falls from the suction tool by its own weight. The stroke in which the valve body 25 cuts off the negative pressure and the stroke in which the valve body 25 projects forward from the opening 23 are simultaneously performed by a single operation of pressing the operating element (push plate) 15.

[0013]

According to the first aspect, since the suction tube and the grip are hollow and have a negative pressure duct formed therein, there is no need for piping for the negative pressure duct. Further, since the on-off valve is formed inside the adsorption tube, the structure is simple and the production is easy.
The foreign matter once adsorbed at the tip of the suction tube is forcibly peeled off by the tip of the valve body at the same time as the negative pressure is cut off, and even if it has some tackiness, a special removal operation is performed. Can be eliminated without the need. By making the valve body cooperate with the opening forming a part of the suction tube, the on-off valve can be configured with a minimum number of parts. And so on.

[Brief description of the drawings]

FIG. 1 is a front view of a suction unit according to an embodiment of the present invention.

FIG. 2 is a plan view thereof.

3 is a cross-sectional view of the negative pressure adsorption unit 10, and is a cross-sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged cross-sectional view showing a state where a foreign substance is adsorbed and showing a main part in an enlarged manner.

FIG. 5 is an enlarged cross-sectional view showing an enlarged main part showing a state where suction is released.

[Explanation of symbols]

10 Negative pressure suction unit 11 Thumb 12 Middle finger 13 Grip 13a Rear end 13b Front end 13c Small hole 13d Hole 14 Index finger 15 Push plate (suction operation element) 16 Support section 17 Connection pipe section 19 Negative pressure duct 20 Suction pipe 21 ... Tip (adsorption surface) 22. ..Tapered part 26 .... Coil spring

Claims (1)

(57) [Claims] 1. A bar-shaped hollow grip and a hollow suction tube connected to a tip of the grip at a predetermined angle to form a series of negative pressure ducts inside the grip and the suction tube. An opening serving as a suction port is provided at the distal end of the suction tube, and a rod-shaped valve body that advances and retreats into the opening is supported inside the suction tube. When the valve body is at the forward end, the front end passes through the opening. A valve body forming the on-off valve is formed so as to be able to protrude forward of the suction tube, a front end portion inserted into the opening, a rear end portion provided with an operation element supported by a small hole formed in the grip, and A large-diameter portion formed between both end portions, and is configured as a normally-open valve that is normally urged in a valve-opening direction by a coil spring contracted between the suction tube and the large-diameter portion. Hand-held vacuum suction device.