JPH11171135A - Sucker for separating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a separating mistake by improving the suction property of a sucker to a container in separating stacked plastic film containers. SOLUTION: A sucker for separating stacked containers comprises a cup holder 2 and a sucker 6 to be fixed thereto, and the sucker is formed of a non-rebounding super-low elastic rubber. Because the sucker is formed of the super-low elastic rubber, its suction property to the containers is extremely high, and no separating mistakes are generated. Also because the super-low elastic rubber is excellent in restoration, it is rapidly returned to its shape before suction after the containers are separated and released, and the containers can be separated at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an automatic packaging machine for automatically packaging chicken eggs for retail use.
The present invention relates to an improvement in a suction cup that sucks a plurality of plastic film containers, generally called packs, which are stacked and accommodated one by one from the bottom, and supplies them to a conveyor of a packaging machine.

[0002]

2. Description of the Related Art A container for packaging eggs, for example, a container for ten eggs, contains five eggs in two rows and lowers individual egg seats to prevent their individual contact. It is formed to protrude. Generally, several ribs are provided on the peripheral wall of each ovary for the purpose of providing mechanical strength and air permeability.

[0003] In automatic packaging of eggs, the containers need to be supplied automatically. Therefore, the containers are sucked one by one by a suction cup of an automatic peeling device, which is conventionally connected to a vacuum device, and are then transferred to a conveyor of a packaging machine. The method of supply was adopted. This suction cup is usually made of sponge rubber,
Due to the shape of the container, it is convenient to make the sucker adsorb outside any one of the eggs.

[0004]

However, since the conventional suction cup is made of sponge rubber having a smooth surface, the suction cup slips when a plastic container having a smooth surface is adsorbed and peeled off. There was an easy drawback. This makes the ribs formed on the ovary more likely to cause a suction error in order to increase the strength and ensure the air permeability. If the suction force of the suction device is increased to prevent suction errors, the suction part of the container will be sucked too deeply into the suction cup when the container is opened, and the frictional resistance unique to rubber will make it difficult to quickly remove the suction cup from the suction cup. .

[0005] Since the peeling of the container by adsorption requires several repetitions per second, if the peeling error occurs, the smoothness of the high-speed and continuous packaging operation of the eggs is significantly impaired. For this reason, the present applicant, at least on the inner wall near the suction port, a sponge rubber layer, a suction cup provided with a flexible layer of a material with good slipperiness and high elasticity, such as nylon woven cloth, on the sponge rubber layer. It was developed (Jitsu 3-3-448, Utility Model Registration No. 1880512). However, the suction cup has a complicated structure and is costly, and the flexible layer has a lack of durability, and a peeling error cannot be completely prevented.

An object of the present invention is to improve the adsorptivity of a suction cup to a container and prevent the stacking containers from being peeled off.

[0007]

A feature of the present invention is that the suction cup comprises a cup holder and a suction cup fixed to the cup holder, and the suction cup is formed of ultra-low elastic rubber.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a suction cup, which comprises a cup holder 2 and a suction cup 6. Cup holder 2
It is a rubber molded product that has been slightly hardened and has an exhaust hole 3 provided inside. The base 4 is attached to a swing arm 11 connected to a vacuum device (not shown) as shown in FIG. Reference numeral 5 denotes a concave groove, which is provided on the inner wall of the distal end portion of the cup holder 2.

The suction cup 6 is formed in a cylindrical shape having the same outer diameter as the outer diameter of the front end of the cup holder 2, and the rear end of the suction cup 6 corresponds to the groove 5. A ridge 7 having the same outer diameter as the inner diameter is formed in a ring shape. And, when the ridge 7 is fitted into the concave groove 5,
The suction cup 6 is fixed to the cup holder 2 by applying an adhesive such as a jelly-like instant adhesive and fitting the ridge 7 into the concave groove 5. Reference numeral 8 denotes a suction chamber of the suction cup 1, which communicates with the exhaust hole 3.

Here, as the material of the suction cup 6, a very soft urethane resin ultra-low elastic rubber (trade name: Gelnack U) having no resilience is employed. The hardness exceeds the region of rubber hardness, and the region of gelnack hardness belongs to 0 to 4 degrees, and the rubber hardness (SHOREA) is minus 20 or less in gelnack hardness. In addition, after being deformed by a load, when the load is removed, it has a characteristic of quickly restoring to its original shape.

As shown in FIG. 2, the suction cup 1 is connected to a vacuum device (not shown) and is attached to a swing arm 11 which swings up and down by a crank mechanism (not shown). Then, several hundred containers 13 are stacked and accommodated in the magazine 12 of the automatic peeling device. Reference numeral 15 denotes a rib provided on the egg seat 14. The sucker 1 is one of the plurality of ova 14 of the lowermost container 13a.
Is sucked from the outside, peeled off from the group of containers 13 and supplied to a conveyor of an automatic packaging machine (not shown).

The egg cup 14 has a complicated cross-sectional shape (octagonal shape close to a circle) with ribs 15 formed thereon. In addition to being deformed and adsorbing moderately, the surface may have moderate stickiness, so that peeling error does not occur.

A groove is formed on the outer surface of the cup holder 2.
Each of the suction cups 6 may be provided with a ridge fitted into the concave groove, and the two may be bonded to each other. Alternatively, the ultra-low elastic rubber may be bonded to a cup holder having another structure. The bonding portion between the two 2 and 6 is also optional and is not limited to the above-mentioned portion. For example, the tip surface of the cup holder 2 and the inner wall of the concave groove 5,
The distal end surface of the suction cup 6 and the outer peripheral surface of the ridge 6 may be bonded, or the distal end surface of the cup holder 2 and the distal end surface of the suction cup 6 may be bonded. Furthermore, a band made of metal, plastic, rubber, or the like may be wound around the outer periphery of the bonded portion between the two.

[0014]

According to the present invention, when the stacked containers are adsorbed and peeled off, ultra-low elasticity rubber is used for the suction cup, so that the adsorbing property is extremely high and no peeling error occurs. Further, since the suction cup returns to the shape before suction very quickly after the container is peeled open, the peeling process of the container can be further speeded up.

The structure is extremely simple as compared with a conventional suction cup, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view.

FIG. 2 is a side view showing a state in which a stacked container is attached to a swing arm of an automatic peeling device and a stacked container is sucked and peeled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sucker 2 Cup holder 6 Suction cup 11 Swing arm 13 Container 14 Egg

Claims (2)

[Claims] 1. A suction cup comprising a cup holder and a suction cup fixed to the cup holder, wherein the suction cup is made of ultra-low elastic rubber and is used for peeling a container. 2. The suction cup according to claim 1, wherein the cup holder and the suction cup are fixed with an adhesive.