JP4458820B2 - Opening device for tubular plastic film bags - Google Patents

Description

The present invention relates to a tubular plastic that can reliably open the mouth of a bag in a tight contact state when a port of a mouth constituent material is inserted into an opening of a bag made of a tubular plastic film such as an inflation tube and welded in an airtight state. The present invention relates to a film bag mouth opening device .

As a technique for sequentially mechanically opening a plastic film bag in close contact with an inflation tube or the like, for example, a partially unsealed bag opening as described in Patent Document 1 is used. From the front and back sides, suction and separation by a suction member (vacuum pad) is performed to separate and expand.

At this time, an air cylinder or the like is frequently used as a means for supporting the suction member to move up and down.
JP 2001-293798 A (5th page, left column, lines 33 to 35 and FIG. 11)

The problem to be solved by the present invention is that not all of the openings are necessarily expanded well when the openings of the bag are adsorbed from the front and back by the adsorbing member and expanded.
This is because, for example, a bag made of a cylindrical plastic film such as an inflation tube is stacked several times before the opening is expanded, or the films on the front and back are tightly adhered to each other by the load pressure by the machine of the process (hereinafter, (It is also sometimes called “blocking”.) To peel it off at once and expand it as an opening, it is necessary to adjust the peeling speed after the initial adsorption slowly, but the peeling speed is slow. If this is the case, the expansion process takes time and the efficiency is deteriorated. Therefore, it is unavoidable that the expansion process is unavoidably performed at a constant speed with the knowledge that some expansion failure may occur.
The present invention has been made to solve the above-described problem, and a method for expanding the mouth of a cylindrical plastic film bag capable of reliably and quickly expanding the openings of all bags and its An object is to provide an apparatus.

In other words, the mouth opening device for the tubular plastic film bag of the present invention includes an adsorbing member that adsorbs and expands the opening of the bag from its front and back, and an L-shape that moves up and down while supporting the adsorbing member. a first elevating means and attached to connect to Jo lifting punch base frame, prior to actuation of the first lifting means with engagement to the L-shaped lifting punch slowly the L-shaped lifting punch, and the slight Second elevating means attached to a base frame for raising and lowering the distance, and the second elevating means has an elevating rod having a substantially wedge-shaped distal end portion, and the distal end portion of the elevating rod is actuated in the left-right direction. Is disposed so as to be slidable between a pair of rolls of an upper roll attached to the L-shaped lifting rod of the first lifting means and a lower roll attached to the base frame. Features.

With such a configuration, the plastic film bag whose mouth is widened is such that the first part where the films are in close contact with each other is slowly and powerfully separated slightly from the front and back by the adsorbing member, and at the same time the film A small amount of air is introduced into the contact portion.
As a result, the blocking of the film is released, and after that, even if the adsorption members on the front and back of the film are rapidly separated, the film cannot be expanded and can be expanded smoothly, resulting in a decrease in processing efficiency. It ’s okay.

In addition, the use of the first elevating means and the second elevating means as the expansion device for the tubular plastic film film bag according to the present invention can surely switch the ascending / descending speed of the adsorbing member from slow to rapid. This is desirable because the structure can be made simple and inexpensive.
The second elevating means has an elevating rod with a substantially wedge-shaped tip, and the elevating rod is operated in the left-right direction. The above-described structure causes the second elevating device to operate at a normal speed. However, the lifting / lowering rod of the first lifting / lowering means moves slowly and powerfully (breaks the blocking), and the opening of the film can be reliably expanded by a length corresponding to the width of the wedges. .

The method of expanding the mouth of a cylindrical plastic film bag according to the present invention slows the initial speed of separating the adsorbing member in the up-down direction and then rapidly, so that the bag cannot be expanded due to blocking of the bag. Therefore, the expansion process can be carried out reliably and without reducing the expansion efficiency.
Further, since the mouth opening device has a structure in which the opening of the bag is performed in a two-step operation by the first and second lifting means, it is easy to make the opening of the opening of the bag strong and slow. Thus, the processing obstacle due to the inability to expand the bag due to blocking can be overcome.
At this time, since the tip of the lifting rod of the second lifting / lowering means has a wedge shape, the first lifting / lowering means that supports the suction member is not wedged without specially operating the lifting / lowering speed of the second lifting / lowering means. It can be lifted slowly and powerfully by a distance corresponding to the struck width.

The method and apparatus of the present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view showing an example of a process for expanding an opening of a cylindrical plastic film bag according to the present invention, and FIG. 2 is an embodiment of a structure of an opening expanding apparatus for a bag in FIG. It is side explanatory drawing which shows an example.
L-tubular plastic film bag mouth expanding device 1 in this embodiment to vertically movable support the suction members 3 which widens adsorbs the opening 2 'the bag 2 from the front and back a first lifting means (air cylinder) 5 which is attached to the base frame 11 connected to Jo lifting punch 4, a second lifting means that attached to the base frame 11 disposed in the vicinity of the first lifting means 5 (air cylinder ) 6 is provided. At this time, the first and second lifting and lowering means are disposed on at least one of the upper and lower sides of the placing table (conveyor or the like) 7 of the bag 1.
The tip of the lifting / lowering rod 6 'of the second lifting / lowering means 6 is formed in a substantially wedge shape 8 and attached to the upper roll 4' and the base frame attached to the L-shaped lifting / lowering rod 4 of the first lifting / lowering means 5. The pair of rolls 4 'and 4' of the lower roll 4 ' can be engaged and slid in the left-right direction.
Next, the operation of the first embodiment will be described.

In the bag opening expanding device 1 having such a structure, when the bag opening 2 ′ is inserted between the adsorbing members 3, 3, first, the front and back of the bag 2 is moved by the operation of the first elevating means 5. It is pressed and supported by the suction members (suction pads) 3 and 3. Next, by operating the second lifting / lowering means 6, the wedge-shaped tip 8 of the lifting / lowering rod 6 ′ is connected to the upper roll 4 ′ attached to the L-shaped lifting / lowering rod 4 of the first lifting / lowering means 5. The L-shaped lifting / lowering rod 4 of the first lifting / lowering means 5 and the suction member 3 supported by the first lifting / lowering means 5 by being inserted between the pair of rolls 4 ′ and 4 ′ of the lower roll 4 ′ attached to the frame 11 . 3 can be moved arrogantly and powerfully by a small distance in the direction away from each other.
As a result, even the opening 2 ′ of the bag 2 that is tightly closed due to the blocking phenomenon is opened slightly, and air is introduced into the inside of the opening of the bag 2.
Subsequently, by operating the first lifting / lowering means 5, the adsorbing members 3 and 3 are further separated, and the opening 2 'of the bag 2 is quickly and completely expanded.

The first and second lifting / lowering means described above are sequentially operated in accordance with instructions from an electric control means (not shown).

FIG. 3 is an explanatory side view showing another embodiment of the structure of the bag opening expanding device in FIG. 1, and FIG. 4 shows the moving speed of the adsorbing member according to the opening expanding device of the present invention. It is a chart which shows one Example.
In FIG. 3, the expansion device 11 has an adsorbing member that adsorbs and expands the opening 2 ′ of the bag 2 from the front and back, and the adsorbing members 3 and 3 slide along the fixed frame 12. Each is supported by a sliding member 13 that is movably fitted. The fixed frame 12 is fixed to the upper surface of a fixing base 14 attached to the lifting / lowering rod 4 of the first lifting / lowering means 5, and the fixed frame 12 and the sliding member 13 each have one side wall. The sliding member 13 is engaged with the slider 15, and the sliding member 13 is finely moved up and down with a strong force when the slider 15 is moved left and right. In order to slide the slider 15 left and right, one end side of the slider 15 is connected to an elevating rod 6 ′ of the second elevating means 6 separately provided on the fixed base 14.
With such a structure, first, the second elevating means 6 'is operated first, and then the first elevating means 4 is operated, so that the adsorbing members 3, 3 on the front and back of the bag 2 are initially subjected to a strong force. Arrogantly, then it can be quickly separated vertically.

In the second embodiment, both side edges of the slider 15 are slid between the fixed frame 12 and the sliding member 13 to raise and lower the suction members 3 and 3 arrogantly and strongly. Not limited to this, as another technique, a fixed roll is used in place of the slider, a cam with a bent groove is provided in place of the fixed frame 12 and the sliding member 13, and the rotating roll is slid in the groove. It can also be a movable structure.
In this way, it is only necessary to have a structure that can change the entire expansion / contraction stroke of the second lifting / lowering means 6 ′ to one that strongly finely moves the stroke of the first lifting / lowering means 4.

In the present invention, a bag for storing goods in a store (supermarket or the like) in which a synthetic resin bag is used is used. It can also be used as a bag opening device for storing goods in stores (supermarkets, etc.).

The perspective view which shows an example of the process by which the opening part of a cylindrical plastic film bag making apparatus is expanded. Side surface explanatory drawing which shows one Example of the expansion apparatus of the bag opening part in FIG. Side surface explanatory drawing which shows the other Example of the expansion apparatus of the bag opening part in FIG. The chart which shows an example of the change of the moving speed of the adsorption member concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mouth opening device of bag making of cylindrical plastic film 2 Plastic bag 2 'Bag opening 3 Adsorption member (adsorption pad)
4 L-shaped lifting rod 4 'roll 5 First lifting means (air cylinder)
6 Second lifting means (air cylinder)
6 ' lifting rod 7 mounting table (conveyor)
8 Wedge-shaped tip 9 Port 10 Suction hole (for preventing slippage)
11 Base frame 12 Fixed frame body 13 Sliding member 14 Fixed base 15 Slider 16 Groove cam

Claims (1)

An adsorbing member that adsorbs and expands the opening of the bag from the front and back, a first elevating means attached to a base frame connected to an L-shaped elevating rod that supports the adsorbing member and moves up and down; A second elevating means that is engaged with the L-shaped elevating rod before the operation of the elevating means and is attached to a base frame that raises and lowers the L-shaped elevating rod slowly and a small distance; The elevating means has an elevating rod having a substantially wedge-shaped tip, and when the elevating rod is operated in the left-right direction, the upper end is attached to the L-shaped elevating rod of the first elevating means . A mouth opening device for a cylindrical plastic film bag, characterized in that it is slidably disposed between a pair of rolls and a pair of lower rolls attached to the base frame .

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