JPH0535609U - Bag opening device - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the opening rate of an opening device that opens a bag mouth of a flat bag by relatively moving a pair of suction heads having a plurality of suction holes. [Structure] A plurality of suction holes 2 arranged in a straight line on opposing surfaces of a pair of suction heads 1a, 1b provided so as to be relatively movable.
To form. Of the plurality of suction holes 2, suction holes 2a at both ends
And the remaining suction holes 2b are independent of suction force generators 5 and 6
And suction force is applied to each suction hole 2 by the operation of each suction force generation device 5, 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bag mouth opening device for opening a bag mouth of a flat bag made of a film such as polyethylene or a laminated film.

[0002]

[Prior Art]

 In an automatic bag filling machine that packs appropriate products into a flat bag such as a polyethylene bag, the bag mouth opening device opens the bag mouth and holds it in the open state to hold the product inside. Filling.

A device shown in FIG. 5 is conventionally known as the bag mouth opening device. This unsealing device forms a plurality of suction holes 12 linearly arranged on the facing surfaces of a pair of suction heads 11a and 11b that are relatively movable, and the pair of suction heads 11a and 11b forms a flat bag. After holding the opening A of the bag A from both sides and sucking the opening of the bag A by the suction force acting on each of the suction holes 12, the pair of suction heads 11a and 11b are moved relative to each other to the bag mouth. Is opened.

In the opened state of the bag mouth, as shown in FIG. 6, the flat bag pieces a on both sides of the bag A are bent from the portions sucked by the suction holes 12a at both ends of the suction holes 12 arranged in a straight line. Therefore, vacuum leakage often occurs in the suction hole 12a facing the bent position.

[0005]

[Problems to be solved by the device]

 By the way, in the conventional unsealing device, a plurality of linearly arranged suction holes 12 are communicated with a single suction passage 13 formed in the suction heads 11a and 11b, and the suction generation device is connected to the suction passage 13. Since the suction force is applied to the plurality of suction holes 12 by a single suction generator, when the bag pieces a are bent to cause vacuum leakage in the suction holes 12a at both ends, the suction force of each suction hole 12 is reduced. There is an inconvenience that the rate of the opening decreases and the adsorption becomes poor, the opening of the bag A is prevented, and the opening rate is low.

Further, even if the bag mouth is opened, the holding power of the bag A is weak, and there is the inconvenience of dropping the bag A when filling the product.

This invention has the technical problems of eliminating the above-mentioned inconvenience, improving the opening rate of the bag mouth, and increasing the holding power of the bag in the opened state.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, among a plurality of linearly arranged suction holes provided in the suction head, the suction holes at both ends and the remaining suction holes are connected to an independent suction force generation device. The adopted configuration was adopted.

[0009]

[Action]

 With the above configuration, even if a vacuum leak occurs due to the bending of the bag piece in the suction holes at both ends of the linearly arranged suction holes during suction of the bag, the remaining suction holes are not affected and the pair of suction holes is not affected. The bag mouth can be reliably opened by the relative outward movement of the suction head.

[0010]

【Example】

 An embodiment of this 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 the facing surfaces of the pair of suction heads 1a and 1b that are relatively movable. A first suction passage 3 and a second suction passage 4 are formed in the suction heads 1a and 1b, and the suction passages 3 and 4 each include a first suction force generation device 5 and a second suction force generation device including a vacuum pump or the like. 6 is connected.

Here, the plurality of suction holes 2 arranged in a straight line may be provided in a single row, or may be provided in a plurality of rows above and below, as shown in FIG. Of the plurality of suction holes 2 in each row, the 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.

Now, when the first suction force generator 5 and the second suction force generator 6 are activated, the first suction force generator 5 applies suction force to the suction holes 2a at both ends of each row, and A suction force is applied to the remaining suction holes 2b by the 2-suction force generation device 6.

When opening the bag mouth of the bag A, a suction force is applied to each suction hole 2 to suck the bag mouth part from both sides by the pair of suction heads 1a and 1b, and the pair of suction heads 1a and 1b. To move outward relative to each other.

At this time, the pair of bag pieces a of the bag A is bent at a position facing the suction holes 2a at both ends of each row, and a slight vacuum leak occurs in the suction holes 2a at both ends due to the bending. There is also.

However, since the suction holes 2a at both ends and the remaining suction holes 2b are structured so that suction force is generated by the suction force generators 5 and 6 which are independent from each other, a vacuum leak occurs in the suction holes 2a at both ends. However, the remaining suction holes 2b are not affected at all, and as a result, the bag mouth can be reliably opened.

In the case of the embodiment, the suction force is applied to the suction holes 2a at both ends of each row by the same first suction force generation device 5, but the suction holes 2a at both ends are independently suctioned. A suction force may be applied by a generator.

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

[0018]

[Effect of the device]

 As described above, in the bag mouth opening device according to the present invention, when the bag mouth is opened, even if a vacuum leak occurs in the suction holes at both ends, it does not affect the suction force of the remaining suction holes. The bag mouth 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 sucked state, so that the bag holding force is high and the bag can be prevented from falling.

[Brief description of 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 line II-II in FIG.

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

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 heads 2, 2a, 2b Suction holes 5, 6 Suction force generator

Claims (1)

[Scope of utility model registration request] 1. A bag mouth of a flat bag formed by linearly forming a plurality of suction holes on opposing surfaces of a pair of relatively movable suction heads, and suction force acting on each suction hole. In the bag mouth opening device for adsorbing from both sides and opening the bag mouth by moving the pair of adsorption heads in the relative outward direction, among the plurality of suction holes arranged in a straight line, the suction holes at both ends and the remaining An opening device for a bag mouth, characterized in that the suction hole communicates with an independent suction force generator.