JPH03115025A - Vacuum adsorbtion plate and manufacture thereof - Google Patents

Abstract

PURPOSE:To restrict production of static electricity to the minimum, and prevent cracking at the forward end part or a bent part by setting the section of a bent part of bellows to be thick and the middle part between a bent part to another bent part to be relatively thin, and forming the forward end of a bowl to be a flat surface without having burrs. CONSTITUTION:A distance from a side frame presents a thick size a1 at a bent part and a relatively thin size b1 in the middle part to form a first stage inner core 13 of a disc form protruded in the form of or and a second stage side frame 14 of the same form as a first stage side frame 12 is put on the first stage side frame 12. Next a third stage inner core of the same form as the first stage inner core 13 is put on a second stage inner core 15, a plural stages are formed successively and for the interval, the bent part is sized thick, while the middle part is sized thin. A top plate 16 having a hole 16c for injecting resin bored in a heat part and a protruding part 16d where a hole for vacuum suction is formed is put onto a side frame at the last stage for assembling a formwork itself, and resin liquid is injected from a pot where resin liquid of material rubber is stored, and it is vulcanized and released from mold to obtain a moulded product.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a vacuum suction cup used for conveying paper, parts with built-in ICs, etc., and a method for manufacturing the same, and more specifically to a vacuum suction cup that generates less static electricity. The present invention also relates to a suction cup that does not cause cracks, etc., and a method for manufacturing the same.

(Prior art) Conventionally, vacuum suction cups are generally shaped like an upside-down bowl, but in this shape, the tip of the bowl repeatedly expands and contracts during adsorption and detachment, so the sliding action Depending on the use, friction may occur between the rubber suction cup and objects such as paper or IC parts, causing static electricity. This static electricity causes color spots in printing, etc., and in electronic parts equipped with ICs, static electricity discharges and generates electromagnetic waves that cause electronic devices to go haywire, making them highly disliked.

In addition, due to the manufacturing method in which the bowl-shaped tip of the suction cup is divided into two parts vertically, it is difficult to avoid the formation of burrs at the vertical cracks, and if the two tips of the two molds turn around for sliding action, burrs will occur. Stress and strain are likely to occur in the parts, and as a result, even if there is a slight protrusion or dust, the problem arises that the seal will tear and the vacuum bonding force will be lost.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and its first purpose is to create a bellows-like shape with no sliding action in order to suppress the generation of static electricity as much as possible, and to The object of the present invention is to obtain a suction cup with a flat surface that does not generate internal stress strain even after repeated pressing and has no burrs.A second object is to provide a manufacturing method that embodies the above-mentioned form.

<f! Means for Solving the Problem) The vacuum suction cup of the present invention is a vacuum suction cup formed by forming a bowl-shaped disc body into a plurality of bellows-shaped parts.
2. a3. a4 ... is the cross-sectional thickness, and intermediate portions bl and b2 from the bending part to the bending part.

b3... is relatively thin, and both optical ends are flat and tapered without burrs.

The manufacturing method is to provide a disk-shaped bottom plate with a female-shaped bulge at the tip of the bowl, and to protrude an inner wall from the bottom plate in the shape of a ``<'' at a distance equal to the thickness of the rubber. A hollow disc-shaped first-stage side frame is placed, and the space between the side frame and the side frame is such that the wall thickness is Al at the bent part and the relatively thin wall BL at the middle part, and the space is protruded in the shape of a "<". A second stage side frame having the same shape as the first stage side frame is placed on the first stage side frame; A third-stage inner core of the same shape as the above is placed on top of the second-stage inner core to form a plurality of stages one after another, and the spacing between them is determined by making the bent part thicker and the middle part thinner, as described above. Then, a ceiling panel with a hole for resin injection in the head and a convex part to form a hole for vacuum suction was placed over the side frame of the last stage, and the masonry of the formwork itself was started. The resin liquid is injected onto the mold from a pot storing resin liquid of raw rubber, and the molded product is obtained by vulcanization and demolding.

(Function) When conveying with a vacuum suction cup, the multi-stage bellows-shaped disk body hardly moves the tip of the disk by 1 μ due to its bending action, and works to suppress the generation of static electricity. The sections al r a2, a3, a4... are the cross-sectional thicknesses, and the intermediate portions bl, b2, from the bending part to the bending part are
b3 The disk body made of relatively thin walls suppresses the stress strain caused by bending and does not generate cracks. The flat, burr-free optical edges also prevent cracks from forming.

In addition, the manufacturing method of the present invention, in which the inner core and side frames are stacked alternately, does not generate any burrs at both light ends and forms a smooth surface, extending the product life. Since the thickness is formed in the thick part and the thin part, and no burrs are formed in the longitudinal direction, the occurrence of cracks is suppressed.

(Example) In Fig. 1, which depicts a vertical side view of the suction cup of the present invention, 1
In the entire suction cup, a fitting groove 2a into which a metal fitting connected to a compressor or the like is inserted faces the head 2, and a three-stage bellows-shaped plate 3 is disposed below the fitting groove 2a. This disk body 3 has outer and inner bent portions al forming a bellows,
a2, a3, and a4 have thick diameters in their longitudinal sections, while b1, b2, . b3 is made thinner than that. For example, the diameter is about 50.
In the case of a mm suction cup, the thickness of at is 4 mm, and the thickness of b is
It is made to have a thickness of about 1.5 mm, which is about 60% less than the original thickness, and is vulcanized and molded with natural rubber.

To explain the manufacturing method, first, a disk-shaped bottom plate 11 is provided with a raised part shaped like the tip of a bowl, and an inner wall is formed in a "<" shape at a distance from the bottom plate by the thickness of the bowl. A protruding hollow disk-shaped first stage side frame 12 is placed. It is assumed that the top of this bottom plate 11 and the bottom of the side frame 12 are offset by half a distance.

Next, a disk-shaped first-stage inner core 13 protruding in the shape of a "<" that forms an outer bent portion is formed, and this is attached to the bottom plate 11.
The positioning bottle Ila protruding from the bottom plate 11 and the bottle hole 13b are fitted onto the top and placed in a fixed position. At this time, the distance between the inner core 13 and the side frame 12 is dimensioned so that it is thick at the bent part of the "<" shape and is relatively thin at the middle part.

Furthermore, a second stage side frame 14 having the same shape as the first stage side frame 12 is provided.
a positioning bin and hole 12a on the first stage side frame 12,
14b and placed in a fixed position, and a second-stage inner core work 5 having the same shape as the first-stage inner core 13 is placed on top of the first-stage inner core 13 with a positioning bin and a hole. 13a and 15b are fitted and mounted.

The interval is determined by making the bent part thicker and making the intermediate part thinner, as described above.

Then, the ceiling panel 1 is provided with a hole 16c for resin injection in the head part and a protrusion 16d for forming a hole for vacuum suction.
6 is placed over -F of the second stage example frame 14, and the masonry of the form itself is completed.

Finally, the bot 17 filled with the resin liquid of the raw rubber is brought into contact with the mold, and pressed with the push lid 18, the resin liquid is injected into the void formed by the mold, and the resin liquid is applied. Molded with sulfur. After a certain period of time has elapsed, molding is performed in the reverse order to obtain a molded product.

Next, to explain the operation of this embodiment related to the above configuration, when the present vacuum suction cup is used to convey the material, it is formed into a three-stage bellows shape, so its volume contracts due to its bending action, creating a vacuum inside and sucking it. , the sliding of the tip of the board is minimal. Therefore, it works to suppress the generation of static electricity as much as possible. Also, the bellows bent part a
t, a2. a3 and a4 are the cross-sectional thicknesses, and intermediate portions bl, b2 . Since B3 is made relatively thin, the strength of the bent part where bending stress is concentrated is maintained, and the thin middle part absorbs the shrinkage due to bending and compensates for the weakening of rubber elasticity, and the interaction prevents cracks. Occurrence can be suppressed. In addition, even if there are protrusions or dust on both optical ends that are flat without burrs, the stress is not distorted and is evenly distributed, so that the occurrence of cracks can be minimized.

The manufacturing method of the present invention, in which the inner core and side frames are alternately stacked, does not generate any burrs at both light ends and forms a smooth surface, thereby extending the product life. Since the thickness of the cross section is formed into the above-mentioned thick part and thin part, and no burrs are generated in the vertical direction, the occurrence of cracks is suppressed.

(Effects of the Invention) As described above, the present invention greatly improves the product life because the generation of static electricity is minimal and there is no cracking at the tip or bending part, and this can be easily obtained using a unique manufacturing method. It has this excellent effect.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a longitudinal sectional side view of a vacuum suction cup of the invention, and FIG. 2 is a schematic longitudinal sectional side view of a framework showing the manufacturing method. l...suction cup 2...head 3...disc body
11...Bottom plate 12...1st stage side frame 13...
・1st tier inner core 14...2nd tier side frame] 2nd tier inner core Ceiling panel/Pot/Push lid 1 list" Ldan 1 2a 1 list U■

Claims (1)

[Scope of Claims] 1) In a vacuum suction cup formed by forming a bowl-shaped disc into a plurality of stages of bellows, the bellows bent portions a1, a2, a3, a4
... is the cross-sectional thickness, and the intermediate part b from the bending part to the bending part
1, b2, b3... are relatively thin, and the tip of the bowl is a flat surface without burrs. 2) A hollow disk-shaped bottom plate with a female-shaped ridge at the tip of the bowl is provided, and an inner wall protrudes from the bottom plate in a “dog” shape at intervals equal to the thickness of the rubber wall. The first stage side frame is placed on it, and the space between the first stage side frame and the side frame is such that the wall thickness is a1 at the bent part and the relatively thin wall is b1 at the middle part, and a disc-shaped part that protrudes in a dogleg shape is installed. A second stage side frame having a second stage inner core formed therein and having the same shape as the first stage side frame is placed on the first stage side frame, and also has the same shape as the first stage inner core. The tier inner core is placed on the second tier inner core to sequentially form a plurality of tiers, and the intervals between the tiers are determined by making the bent part thicker and the middle part thinner as described above. A ceiling panel with a hole for resin injection and a convex part that forms a hole for vacuum suction is placed over the side frame of the last stage, and the formwork itself is assembled. A method for producing a vacuum suction cup characterized by injecting resin liquid from a pot storing resin liquid of raw rubber onto the rubber, and then vulcanizing and demolding the resin liquid to obtain a molded product.