JP2597361Y2 - Bag opening 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 bag opening device for opening a flat bag made of a film such as polyethylene or a laminated film.

[0002]

2. Description of the Related Art In an automatic bagging apparatus for packing appropriate products into a flat bag such as a polyethylene bag, the bag opening of the bag is opened by a bag opening device, and the bag is held in an open state and the inside of the bag is opened. Is filled with goods.

FIG. 5 shows a known bag opening device. The opening device includes a pair of suction heads 11a and 11
b, forming a plurality of suction holes 12 linearly arranged on the opposite surface,
The pair of suction heads 11a and 11b hold the opening of the flat bag A from both sides and suction the opening of the bag A by the suction force acting on each suction hole 12. Then, the pair of suction heads 11a and 11b are moved. The bag mouth is opened by relatively moving outward.

In the open state of the bag mouth, as shown in FIG.
The flat bag pieces a on both sides of the bag A are bent from the portions that are sucked by the suction holes 12a at both ends of the suction holes 12 arranged in a straight line, and a vacuum leak occurs in the suction holes 12a opposed to the bent position. There are many.

[0005]

In the conventional opening device, a plurality of suction holes 12 arranged in a straight line communicate with a single suction passage 13 formed in the suction heads 11a and 11b. Is connected to a plurality of suction holes 12 by a single suction generation device, so that when the bag piece a is bent, vacuum suction occurs in the suction holes 12a at both ends. Suction hole 1
2, there is a disadvantage that the suction force is lowered and the suction becomes poor, which prevents the bag A from being opened and the opening rate is low.

Further, even if the bag mouth is opened, the holding force of the bag A is weak, and there is a disadvantage that the bag A falls when the product is filled.

The technical object of the present invention is to solve the above-mentioned inconveniences, improve the opening rate of the bag mouth, and increase the holding force of the opened bag.

[0008]

In order to solve the above-mentioned problems, in the present invention, a plurality of suction holes arranged in a straight line are formed on opposing surfaces of a pair of suction heads, and the suction head is formed. adsorbed from both sides the bag mouth of Bian flat bag by the, by the opening device of the bag mouth opening the bag mouth by the movement of the relative outer direction of the pair of suction heads, is provided to the suction head straight among the plurality of suction holes arranged in Jo, and communicates with the suction force generating device independent and a suction hole and the remaining suction holes at both ends, all
Be sure to open the bag mouth while applying suction to the suction hole.
That is why the configuration was adopted.

[0009]

With the above construction, even if vacuum leakage occurs due to the bending of the bag piece at the suction holes at both ends of the suction holes arranged linearly during suction of the bag, there is no effect on the remaining suction holes. The bag mouth can be reliably opened by the relative outward movement of the pair of suction heads.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, a plurality of suction holes 2 arranged in a straight line are provided on opposing surfaces of a pair of suction heads 1a and 1b which are relatively movably provided. Further, a first suction passage 3 and a second suction passage 4 are formed in the suction heads 1a and 1b, and a first suction force generation device 5 and a second suction force generation device each including a vacuum pump or the like are formed in each of the suction passages 3 and 4. 6 are connected.

Here, the plurality of suction holes 2 arranged in a straight line may be arranged in a single row, or as shown in FIG. Of the plurality of suction holes 2 in each row, suction holes 2 a at both ends communicate with the first suction passage 3, and the remaining suction holes 2 b communicate with the second suction passage 4.

When the first suction force generator 5 and the second suction force generator 6 are operated, the first suction force generator 5 applies suction force to the suction holes 2a at both ends of each row, and 2 The remaining suction holes 2b are generated by the suction force generator 6.
Is given a suction force.

At the time of opening the bag mouth of bag A, each suction hole 2
, A bag mouth portion is sucked from both sides by a pair of suction heads 1a and 1b, and the pair of suction heads 1a and 1b are provided.
Are relatively moved outward.

At this time, the pair of bag pieces a of the bag A are bent at positions opposite to the suction holes 2a at both ends of each row,
The bending may cause slight vacuum leakage in the suction holes 2a at both ends.

However, since the suction force is applied to the suction holes 2a at both ends and the remaining suction holes 2b by the suction force generators 5 and 6 independent of each other, vacuum leakage occurs at the suction holes 2a at both ends. Does not affect the remaining suction holes 2b, so that the bag mouth can be reliably opened.

In the case of the embodiment, the suction holes 2a at both ends of each row are provided.
Although the suction force is applied by the same first suction force generation device 5, the suction force may be applied to the suction holes 2a at both ends by independent suction force generation devices.

One of the suction heads 1a and 1b may be fixed and the other may be provided movably, or both suction heads 1a and 1b may be provided movably.

[0018]

As described above, in the bag opening device according to the present invention, even if a vacuum leak occurs at the suction holes at both ends when the bag opening is opened, the suction force of the remaining suction holes has no effect. Is not provided , the opening of the bag can be reliably opened, and the opening rate can be improved.

Further, even if a vacuum leak occurs in the suction holes at both ends, the remaining suction holes hold the bag mouth in a suction state, so that the holding force of the bag is high, and the bag can be prevented from dropping.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of an opening device according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a perspective view of the suction head.

FIG. 5 is a partially cutaway plan view showing a conventional opening device.

FIG. 6 is an enlarged sectional view of the above.

[Explanation of symbols]

 1a, 1b suction head 2, 2a, 2b suction hole 5, 6 suction force generator

Claims (1)

(57) [Scope of request for utility model registration] 1. A relatively plurality of suction holes are formed aligned in a straight line on the facing surface of the movably pair of suction head provided, Bian by applying a suction force to each of the plurality of suction holes < A plurality of suction holes arranged in a straight line in a bag mouth opening device that sucks a bag mouth portion of a flat bag from both sides and opens the bag mouth by a relative outward movement of a pair of suction heads. Of which
Bag in a state in which to communicate with the separate suction force generating device and a suction hole and the remaining suction holes at both ends, to impart suction to all of suction holes
A bag opening device for opening a mouth portion .