JP2003034312A - Bagging machine and bagging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bagging machine and a bagging method which can carry out a satisfactory bagging where an object to be packed is securely inserted to the bottom part of a bag, even when the object is to be bagged in a state it is fitted to a packing bag. SOLUTION: In this bagging machine 1, the mouth of the uppermost bag Fa of a bundle Fb of stacked bags is partly opened, on opener 2 is inserted into the mouth of the bag, and then an object W to be packed is inserted. The bagging machine 1 is provided with a pressing member 14 for pressing an extended portion formed on the mouth of the uppermost bag Fa. The pressing member 14 presses the extended portion of the uppermost bag Fa at least from the point that the front end of the object W is inserted into the bag to the point that the front end thereof reaches the bottom part of the bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filling machine for opening an uppermost bag of a stack of stacked bags and then pushing and filling a packaged object such as a bread into the opening. is there.

[0002]

2. Description of the Related Art Conventionally, in this type of bag filling machine, a packaging bag formed by extending a part of a bag mouth is used. Then, two pin holes are provided in the extending portion of the bag mouth in the bag width direction, and a hook-shaped holding tool made of a thin rod is inserted into the two pin holes from above. As a result, the plurality of packaging bags are held on the holding table in a stacked state. When the objects to be packaged such as bread are pushed one by one by the pushing means such as a conveyor, compressed air is blown obliquely upward from the uppermost packaging bag among the packaging bags held in a stacked state, The mouth is half open. Four openers are immediately inserted into the bag opening in the half-opened state so that the bag is fully opened, and the object to be packaged such as a loaf of bread is inserted into the opened packaging bag. When the object to be packaged is further pushed and its front end reaches near the bottom of the bag, the packaging bag is pulled together with the object to be packaged in the pushing direction, and is torn from the holder by being torn near the pin hole. This allows
A packaged product in which the items to be packaged are filled one by one can be continuously obtained. A straight perforation is made around the pin hole toward the edge of the bag mouth, and when the packaging bag is pulled together with the object to be packaged, it is easily torn and removed from the holder. It is like this.

[0003]

In the conventional bag-filling machine described above, for example, when a packaged item such as a loaf of bread is packed in a state of being fitted in a packaging bag, a gap is formed between the packaged item and the outer periphery of the packaged item. It is necessary to carry out bag packing using a packing bag that is not so large. In this case, when inserting the article to be packaged from the bag mouth of the packaging bag, the amount of air escaped from the gap between the outer periphery of the article to be packaged and the inner peripheral surface of the packaging bag is reduced, and the bag bottom side is temporarily closed. As a result of the air being accumulated, the packaging bag will be pulled in the pushing direction together with the object to be packaged by an excessive force. Then, the packaging bag is torn near the pin hole before the packaged object reaches near the bottom of the bag, and it is not possible to perform good bag packing with the packaged object firmly inserted to the bottom. It was A method of preventing such inadvertent "tear" can be considered by making the perforations around the pin hole "difficult to tear", but in this case, the packaging bag does not There is a problem in that the product is not beautifully torn along the line and the appearance of the product is impaired, or the product to be packaged is deformed due to an excessive pushing force. The present invention was created in order to solve the above problems, and even when the bag is packed in a state in which the object to be packaged is fit in the packaging bag, the object to be packaged is a bag. An object of the present invention is to provide a bagging machine and a bagging method capable of performing good bagging that is firmly inserted even near the bottom.

[0004]

The above-mentioned problems can be solved by the invention described in each claim. In the bag filling machine according to the first aspect, for example, compressed air is blown to the uppermost bag of the stack of stacked bags so that the bag mouth is in a semi-opened state. An opener is inserted into the bag opening in the semi-opened state to open the bag, and the packaged object such as bread is pushed to insert the packaged object into the bag. An extension portion is formed on each of the bag mouths of the stacked bags. The "extending portion" is a pressing portion of the bag, and is preferably formed by partially extending the edge portion of the bag mouth located below each of the stacked bags. . When the article to be packaged is pushed into the bag mouth that is in the open state, at least from the time when the front end of the article to be packaged is moved into the bag to the bottom of the bag, the above-mentioned extending portion Is pressed from the upper side by the pressing member at the approximate center of the bag width direction. The term "until the bottom of the bag" as used herein is not limited to a state in which the front end of the object to be packaged reaches the bottom of the bag completely and is in contact therewith, and it reaches slightly from the bottom of the bag to the front. It is a concept that broadly includes such states. The period from the time when the item to be packaged is inserted into the bag to the bottom of the bag is the period during which the residual air at the bottom of the bag is released from the gap between the inner peripheral surface of the bag and the item to be packaged. By pressing the extending portion at least during this period, it is possible to prevent the bag from being pulled together with the object to be packaged in the pushing direction due to the influence of the air accumulated in the bag bottom portion. This prevents the bag from coming off the holder before the object to be packaged reaches the vicinity of the bottom portion, and a good packaged product can be obtained in which the object to be packaged is securely filled up to the vicinity of the bag bottom portion.

In the bag filling machine according to the second aspect of the present invention, the pressing period of the extension portion by the pressing member can be changed. In order to make it possible to change the holding period, the drive source for driving the holding member up and down may be constituted by, for example, a servo motor, an air cylinder, or the like to control the movement thereof. Since the pressing period of the extension portion by the pressing member can be changed, it is possible to easily cope with the case where the size of the packaged object or the packaging bag is different. For example, when the size of the bag in the longitudinal direction (pushing direction) is long, the period in which the object to be packaged is pushed inside the bag becomes long, but by setting the holding period of the extension portion to be long, It is possible to firmly prevent the displacement of the bag until the packaged object reaches near the bottom of the bag. On the other hand, if the size of the bag in the longitudinal direction (pushing direction) is short, the front end of the packaged object will reach the vicinity of the bottom of the bag earlier by that amount. By doing so, it is possible to avoid the problem that the extended portion is still pressed down even when the object to be packaged reaches the vicinity of the bag bottom portion.

In the bag filling machine according to the third aspect of the present invention, the bundle of bags in a stacked state has pins inserted into two pin holes formed in the bag width direction at the extending portion of the bag mouth. Held in.
The extended portion of the bag mouth is not only pressed by the pressing member between the two pin holes, but also pressed from above by the pair of outer pressing members at the position outside the pin hole. Thereby, even if air is blown to the outer portion of the pin hole, it is possible to prevent the bag other than the uppermost bag from being turned up and hindering the filling operation. Further, when the articles are inserted from the bag mouth and pushed out, the extending portions of the laminated bag mouths of the second and subsequent sheets can be held, and the laminated bags of the second and subsequent sheets are in a stacked state without being displaced. Can be maintained.

In the bag-filling method according to the fourth aspect, the bag mouth is made half-open and half-open by blowing air, for example, onto the uppermost bag of the stack of stacked bags. The opener is opened by inserting the opener into the bag mouth. When the object to be packaged is inserted into the bag mouth of the opened bag, at least the front end of the object to be packaged is formed in the bag mouth during the movement from the time of insertion into the bag to the bag bottom. The extended portion is pressed by the pressing member. As a result, the bag is prevented from being pulled together with the object to be packaged in the pushing direction and separated from the holder or the like, and good bagging can be performed in which the object to be packaged is filled even near the bottom of the bag.

[0008]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to the drawings. Here, FIG. 1 is a schematic side view of essential parts of the bagging machine 1 according to the present embodiment, FIG. 2 is a schematic plan view of FIG. 1, and FIG. FIG. 4 is a schematic view showing the opener 2 of FIG. 1 in the direction of arrow B. The bag-filling machine 1 continuously fills the bags in a stacked state one by one with the objects W to be packed, such as bread, which are conveyed by a pushing means 3 (see FIG. 5) such as a conveyor to form a packaged product. To get it. An air nozzle N is attached to the uppermost bag Fa of the stacked bag bundle Fb.
High-pressure air is blown from 1 to make the bag mouth half opened. Four openers 2 are inserted into four corners of the bag mouth that is in a semi-opened state so that the bag is fully opened, and low-pressure air is blown from the air nozzle N2 to maintain the opened state up to the bottom of the bag. To be done.
The article W to be pushed by the pushing means 3 is inserted into the bag Fa by being guided by the four openers 2 when passing between the openers 2.

In the bag filling machine 1 according to this embodiment, a bag F as shown in FIG. 11 is used as a bag for packaging.
In the bag F, an extension portion F1 is formed by extending the edge portion of the bag mouth located on the lower side when placed in a stacked state. The extension portion F1 is provided with pin holes F2 at two positions with a required length in the bag width direction, and a holding tool 5 formed in the shape of a hail with fine metal is inserted into the pin hole F2 from above. As a result, the bag F is held on the support base 4 in a stacked state. As the bag F is consumed, the support base 4 can be raised so that the height of the uppermost bag Fa is kept constant. When high-pressure air is blown to the bag F, as shown in FIG. 12, the portion other than the extending portion F1 pressed downward is lifted by the entire width of the bag, and the bag mouth is in a half-opened state. When the opener 2 is inserted into the bag mouth, as shown in FIG. 13, the outer portion of the holder 5 is lifted and the bag mouth is fully opened.

As shown in FIG. 1, the bag filling machine 1 has four openers 2 for inserting the bag into the bag and opening and closing the bag in the vertical direction so that the bag mouth of the bag is fully opened. Of the bag Fa. The extension part holding means 6 for pressing the extension part F1 of the bag Fa from above and the extension part support means 7 for supporting the extension part of the bag bundle Fb from below are mainly configured. There is.

Four openers 2 inserted in the bag
As shown in FIG. 1, is made of a tapered metal member that can be easily inserted into the bag. Further, as shown in FIG. 4, the four openers 2 have a substantially L-shaped cross section, and are arranged one at each of four corners of upper, lower, left and right corresponding to the corners of the article W to be packaged. There is. As a result, the article W to be packaged (for example, bread etc.) carried by the pushing means 3 such as a conveyor is smoothly inserted into the bag while being guided along the inner side surface of the opener 2. As shown in FIG. 1, the opener 2 a arranged on the upper side and the opener 2 b arranged on the lower side are rotatably connected to the link bar 9. Link bar 9
Is a member forming a part of a crank mechanism for operating the opener 2, and an operating lever 12 connected to a lower end of the link bar 9 via a connecting piece 11 interlocks with the swing of the link bar 9. The elliptical recess 13 formed on the upper opener 2a is pushed up. As a result, after the tip of the opener 2 is inserted into the bag mouth,
A beak-like opening / closing operation with a two-step speed is repeated in which the bag gradually opens as it moves forward in the bag, and when it reaches the vicinity of the bottom of the bag, the opening operation is completed at once with the timing. In addition, the opener 2a arranged on the upper side and the opener 2b arranged on the lower side are connected to each other at their rear end portions via the tension springs 10, and the front end portion of the opener 2 is closed. When actuated, the elasticity of the tension spring 10 exerts a pulling force in the reopening direction.

As shown in FIG. 1, the extending portion pressing means 6 for pressing the extending portion of the bag has an arm-like pressing member 14 extending above the extending portion of the uppermost bag Fa and a pressing member 14. And a slide member 16 for connecting the pressing member 14 and the servo motor 15 to each other. Servo motor 15
Is fixed to the lower surface of the horizontally arranged installation table 19 with bolts, and the slide member 16 can be slid back and forth along the slide rail 17 also fixed to the lower surface of the installation table 19. There is. When the servomotor 15 rotates, the slide member 16 slides back and forth via the crank mechanism, and the rod 1 is attached to the front end of the slide member 16.
The pressing member 14 connected via 8 repeats the reciprocating motion up and down with the rotating shaft 20 as the center of rotation. The servomotor 15 is rotationally controlled by control data set in advance corresponding to the type selected by the type setting means of the bag filling machine 1, whereby the holding period of the extension portion by the holding member 14 can be adjusted. Has become. Note that, in FIG. 1, the state where the pressing member 14 has moved to the lower end position is shown by a solid line.
The state where is moved to the upper end position is indicated by a broken line. As can be seen from the position of the pressing member 14 shown by the solid line, the extending portion of the bag is configured to be pressed from above by the pressing member 14 with the holding member 5 in the shape of a fine metal being interposed therebetween. In addition, the pressing member 14 is set so as to press the extending portion of the bag between the two pin holes F2 through which the holder 5 is inserted, at a substantially central portion in the bag width direction.

Further, as shown in FIG. 1, an outer pressing member 21 for pressing the extension portion of the bag from above from outside the two pin holes F2 is coaxial with the pressing member 14 on the rotating shaft 20. It is mounted on the upper side (in FIG. 1, only the outer holding member 21 is taken out downward for clarity). That is, the pressing member 14 and the outer pressing member 21 are configured to reciprocate vertically with the rotating shaft 20 as a common rotation center. As shown in FIG. 1, the pressing member 14 is attached with a circular cross section so that the pressing member 14 can freely rotate with respect to the rotating shaft 20. On the other hand, the outer pressing member 21 is attached in a substantially square cross section so that the outer pressing member 21 cannot rotate relative to the rotating shaft 20. The rotary shaft 20 is configured to repeat a half-rotation operation by a drive source (not shown) such as an air cylinder, but the rotation shaft 20 is relatively non-rotatable by the half-rotation operation. The outer pressing member 21 fixed to the upper and lower parts is adapted to reciprocate up and down. That is,
The pressing member 14 and the outer pressing member 21 form the rotating shaft 2
Although 0 is used as a common rotation center, each is independently operated by a separate drive source. As shown in FIGS. 1 and 2, the pair of outer pressing members 21 are
It is also fixed by a single adjusting bolt 23 arranged in parallel with the rotating shaft 20. The adjustment bolt 23 is formed with threads opposite to each other at the respective attachment points of the pair of left and right outer pressing members 21. When the adjusting handle 22 attached to the end of the adjusting bolt 23 is rotated in one direction, the pair of outer pressing members 21 are simultaneously moved in opposite directions by the rotation of the reverse screws, so that the bag width remains fixed at the center. The arrangement interval in the direction can be adjusted. As a result, even when the packaging bags having different widths are set, it is possible to easily deal with them by operating the adjustment handle 22.

As shown in FIGS. 1 and 3, the extension portion supporting means 7 for supporting the extension portion of the bag bundle Fb from below, as shown in FIGS. 1 and 3, is a laterally long support member 8 extending in the width direction of the bag. It is mainly composed of two support shafts 24 that support the support member 8 from below.

As shown in FIG. 3, the support member 8 is supported substantially horizontally by two support shafts 24 which are vertically fixed to the apparatus main body side. Two support shafts 24
Functions as a damper by being formed coaxially and integrally with the compression spring 25, and when a load is applied to the support member 8 from above, the elasticity of the compression spring 25 generates a reaction force in the pushing-up direction. It is like this. By appropriately adjusting the elasticity of the two compression springs 25,
The pressing force applied to the extending portion of the bundle Fb of the bags of the pressing member 14 and the outer pressing member 21 can be changed. Even if the extended portion of the bag is continuously pressed by the pressing member 14 or the like from above, the impact of the compression spring 25 is mitigated by the elasticity of the compression spring 25.

Further, as shown in FIG. 3, a pressing plate 26, which is held in a floating state by two spring pieces 27, is installed corresponding to the pressing position of the pressing member 14 in the central portion of the supporting member 8. . As described above, the pressing member 14 and the outer pressing member 21 independently repeat the vertical movements. However, by performing such shock absorption independently in the vicinity of the center portion of the bag width, the pressing member 14 and The pressing operation of each of the outer pressing members 21 can be performed more stably.

Next, the bag filling operation by the bag filling machine 1 configured as described above will be described with reference to FIGS. Here, FIGS. 5 to 7 show the bag filling machine 1.
The state during the bag packing operation of (1) before insertion of the article W to be packaged,
(2) It is operation | movement explanatory drawing of the pressing member 14 divided into three stages during (3) insertion after insertion. Moreover, FIGS.
Of the outer pressing member 21 divided into three stages, that is, the state during the bag packing operation by the bag packing machine 1 (1) before insertion of the article W to be packaged, (2) during insertion, and (3) after insertion. FIG.

(1) Before Inserting the Packaged Object W As shown in FIG. 5, at the stage before the packaged object W is pushed out and inserted into the bag Fa, the pressing member 14 presses the extended portion. Not yet marked. This is because the object W to be packaged and the bag Fa do not contact and interfere with each other, so that the bag Fa is not pulled in the pushing direction of the object W to be packaged. High-pressure air is blown from the air nozzle N1 toward the front of the bag mouth at a steep angle, and low-pressure air is blown from the air nozzle N2 at a low angle into the bag Fa. Bag Fa
The bag mouth of is slightly opened (semi-opened state). The front end of the opener 2 is in a closed state, and by further advancing in this state, the opener 2 is inserted into the slightly opened bag mouth. Moreover, as shown in FIG.
At the stage before the is pushed and inserted into the bag Fa (the state where the pressing member 14 is in the state shown in FIG. 5),
The pressing of the extending portion by the outer pressing member 21 is started. Since high-pressure air is blown from the air nozzle N1 at a steep angle, bags other than the uppermost bag Fa are prevented from flipping up, and the position of the bag when the opener 2 advances to open the bag mouth. This is because it is necessary to prevent the deviation.

(2) During insertion of the article W to be packaged As shown in FIG. 6, at the stage where the article W to be packaged is pushed and inserted into the bag Fa, the four openers 2 are inserted inside. By opening the front end, the bag mouth of the bag Fa is fully opened. Low-pressure air is blown from the air nozzle N2 at a low angle inside the bag Fa,
The bag Fa is unfolded from the inside and the open state is maintained up to the bottom of the bag. At this time, the pressing member 14 operates downward, and the pressing of the extending portion of the bag Fa is started. This is because when the article W to be packaged is inserted into the bag Fa, the bag Fa is pulled in the pushing direction together with the article W to be packaged by the air remaining at the bottom of the bag Fa. Bag Fa
When the extending portion of the bag is pressed, the bag Fa is prevented from being torn near the pin hole F2, and the situation in which the article W to be packaged is detached from the holder 5 before reaching near the bag bottom is also prevented. To be done. The pressing member 1 as described above
The pressing of the extension part by 4 is at least the object W to be packaged.
It is extremely desirable that the process is performed in the period from the time when the front end of (4) is inserted into the bag to the time when it reaches near the bottom of the bag Fa. This is because the bag Fa is particularly strongly pulled together with the article W during such a period. Further, as shown in FIG. 9, when the article W to be packaged is pushed and inserted into the bag Fa (when the pressing member 14 is in the state shown in FIG. 6), the outer pressing member 21 extends The pressing of the protruding part is temporarily released. When the four openers 2 are opened, the bag mouth is fully opened as shown in FIG. 13, so that the outside of the pin hole F2 can be temporarily lifted and lifted upward. This is because it needs to be in a state. The outer pressing member 2
1 is operated so as to hold down the extending portion of the bundle Fb of the second and subsequent bags, as the bag mouth is fully opened by the opener 2.

(3) After inserting the article W to be packaged, as shown in FIG. 7, the article W to be packaged is pushed and inserted into the bag Fa, and the front end of the article W to be moved reaches the bottom of the bag. At the stage, the pressing of the extending portion by the pressing member 14 is released. This is because it is necessary to remove the bag Fa, in which the article W to be packaged is inserted near the bottom of the bag, from the holder 5 and to push the bag Fa to a further downstream process. When the bag Fa is pushed to the further downstream process,
A plastic binder or the like is attached to the bag mouth to make a final product. Further, as shown in FIG. 10, the stage in which the article W to be packaged is pushed and inserted into the bag Fa and the front end of the article W to be packaged moves to the bag bottom (the pressing member 14 is in the state shown in FIG. 7). In the stage), the outer pressing member 21 continues to press the extension portion against the bundle Fb of bags set below the uppermost bag Fa. Since the central part is not being pressed by the pressing member 14, even the bag dragged by the uppermost bag Fa and set directly below it is the holder 5
This is to prevent it from being removed. At this time, since the drag force on the bag bundle Fb due to the uppermost bag Fa being pushed to the downstream side becomes relatively large, the outer pressing member 21 presses the bag bundle Fb relatively. It is preferable to use a strong force (a force stronger than the pressing force in the stage before insertion in FIG. 8). At this stage, in preparation for the opening of the next bag mouth, the blowing of each of the high pressure and low pressure air has been started.

The above-described states (1) before insertion, (2) during insertion, and (3) after insertion of the article W are cyclically repeated, so that the bag filling machine 1 puts the bag into the bag F. The packing operation is continuous and stable.

As described above, the pressing period of the extension portion by the pressing member 14 or the outer pressing member 21 can be changed. Thereby, even when the size of the bag Fa in the longitudinal direction (size in the pushing direction) is different and the timing when the front end of the article to be packaged W reaches near the bottom of the bag Fa is different, the pressing is suppressed. It can be easily handled only by adjusting the period. For example, even when the articles W to be packaged are breads of different sizes and are packed in packaging bags of different sizes, the holding period of the extension portion by the holding member 14 or the outer holding member 21 is large or small. It can be easily adjusted just by adjusting to.

The present invention is not limited to the above embodiment. For example, in the embodiment, the air nozzle N
Although an example in which air having different pressures is blown at different angles depending on No. 1 and N2 has been shown, the present invention is not limited to this mode. For example, the same air nozzle may be configured to blow air of different pressure, or the same air nozzle may be configured to blow air of the same pressure at different angles.

In the embodiment, the example in which the pressing member 14 is composed of one arm-shaped member is shown, but the present invention can be applied without problems even when it is composed of a plurality of members. Further, although the pressing member 14 presses the extending portion of the bag from above with the holding tool 5 formed in the shape of a hook in between, an example is shown in which the pressing member 14 directly contacts the uppermost bag Fa. The present invention can be applied even when pressing the extension portion. Further, the pressing member 14 locally presses the extending portion of the bag in the substantially central portion in the bag width direction, but the pressing member 14 is configured to press the extending portion of the bag in a wide range in the bag width direction. The present invention can be applied even in the case of

In the embodiment, an example in which the holding tool 5 made of fine gold and in the shape of hail is inserted from above the pin hole F2 is shown. However, for example, two independent pin holes F are provided for the pin.
You may make it hold | maintain a bag in a laminated state by inserting 2. Further, the holder 5 is not always necessary, and the bag may be packed by holding the bag only by the pressing member 14 (or the pressing member 14 and the outer pressing member 21).

The drive source of the pressing member 14 is the servomotor 1
However, other driving devices such as an air cylinder, an electromagnetic solenoid, or a cam lever, a driving mechanism, or the like may be used. Even in this case, the holding period of the extension portion by the holding member 14 can be changed by controlling the operation timing of these drive sources.

The opener 2 may have a structure in which, for example, four openers 2 spread radially from the center to open the bag mouth.

In the embodiment, the example in which the opener 2 is configured to repeat the beak-shaped opening / closing operation at the two-stage speed has been shown, but the present invention is not limited to such a mode. For example, the opening of the bag mouth is opened by a one-step opening / closing operation such that the opener 2 is inserted to the vicinity of the bottom of the bag with the front end of the opener closed and the opening operation is completed at once when the time reaches the vicinity of the bottom of the bag. It may be configured to be performed.

Although the outer pressing member 21 is provided to prevent the bags other than the uppermost bag Fa from being turned up, the outer pressing member 21 may be provided as needed. . For example, it is possible to deal with this by disposing only the pressing member 14 at the central portion.

[0030]

As described above, according to the present invention,
For example, even when the bag is packed in a state in which the object to be packed is fit into the bag for packaging, the bag can be satisfactorily packed with the object to be packed firmly inserted near the bottom of the bag. A packing machine and a bag packing method can be provided.

[Brief description of drawings]

FIG. 1 is a schematic side view of essential parts of a bag filling machine according to an embodiment of the present invention.

FIG. 2 is a schematic plan view corresponding to FIG.

FIG. 3 is a partially cutaway schematic view corresponding to arrow A in FIG.

FIG. 4 is a schematic view showing the opener of the bag filling machine in FIG.

FIG. 5 is an explanatory view of the action of the pressing member before inserting the article to be packaged.

FIG. 6 is an explanatory view of the action of the pressing member during the insertion of the object to be packaged.

FIG. 7 is an explanatory view of the action of the pressing member after inserting the article to be packaged.

FIG. 8 is an explanatory view of the action of the outer pressing member before inserting the article to be packaged.

FIG. 9 is an explanatory view of the action of the outer pressing member during the insertion of the article to be packaged.

FIG. 10 is an operation explanatory view of the outer pressing member after the article to be packaged is inserted.

FIG. 11 is a perspective view showing a packaging bag used in the embodiment of the present invention.

FIG. 12 is a front view showing a bag mouth of the bag in a half-opened state.

FIG. 13 is a front view showing a bag mouth of the bag in a fully opened state.

[Explanation of symbols] 1… Bagging machine 2 ... Opener 5… Retainer (pin) 6 ... Extension part holding means 14 ... Holding member 21 ... Outer holding member N1, N2 ... Air nozzle F ... bag Fa ... the top bag Fb ... a bundle of bags F1 ... Extension part F2 ... Pin hole

Claims (4)

[Claims] 1. A bag filling machine for inserting an object to be packaged after inserting an opener into the bag mouth of the uppermost bag of the stack of bags and inserting the opener into the bag mouth. A pressing member for pressing the extending portion formed at the bag mouth of the upper bag is provided, and the pressing member is at least moved from the time when the front end of the packaged object is inserted into the bag to the bag bottom. A bagging machine, wherein the extension part is pressed down. 2. The bag filling machine according to claim 1, wherein the holding period of the extension portion by the holding member can be changed. 3. The bag filling machine according to claim 1 or 2, wherein the stack of stacked bags has two pins formed in the bag width direction of the extending portion of the bag mouth. A bag filling machine, comprising a pair of outer pressing members that are held by the pins being passed through the holes and that hold the outer positions of the two pin holes. 4. A bag filling method in which a bag mouth of an uppermost bag of a stack of bags in a stacked state is in a semi-open state, and an opener is inserted into the bag mouth, and then an object to be packaged is inserted. During the movement from the time when the front end of the package is inserted into the bag to the bottom of the bag, the extended portion formed at the bag mouth of the uppermost bag is pressed by a pressing member. Method.