JPH06102452B2 - Automatic folding device for bag mouth - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for folding a bag mouth of a bag in which disk-shaped works such as a can lid are stacked and stored.

[Prior art and its problems] Conventionally, the work of packing a can lid into a bag is a work of mechanically opening the bag mouth and inserting a predetermined number of can lids into the bag, and then manually folding the bag mouth. Was going on. For this reason, not only a large number of workers are required and the human cost increases, but also the bag mouth may be opened due to improper folding, and in such a case, it may cause troubles such as stopping the lid making line. Was becoming.

For this reason, there has been a strong demand for a device that automatically folds the bag mouth. However, when folding the bag mouth, the tip portion of the tongue-shaped portion formed by folding is inserted into the overlapping portion of the bag and engaged. Since it is extremely difficult to reliably perform the work of inserting the tip portion of the tongue piece by a machine among such works, it is the actual situation that a folding device that can sufficiently meet the demand has not been provided yet. .

[Object of the Invention] The present invention has been made in view of the above circumstances, and can particularly easily insert the tongue-like portion easily, so that the folding operation of the bag mouth can be reliably automated. It is intended to provide an automatic folding device for a bag mouth.

[Means for Solving Problems] The bag mouth automatic folding device according to the present invention has a substantially semi-cylindrical shape so that one side of a bag side of a cylindrical bag having a work stored therein contacts the other side. A first folding mechanism for crushing into one side, a second folding mechanism for folding one side of the half-cylindrical portion of the bag mouth toward a substantially diameter side of the bag mouth, and a second folding mechanism for folding the other. A third folding mechanism that folds the tongue-shaped portion left on the side toward the substantially diameter side of the bag mouth, and a tip of the tongue-shaped portion is folded and inserted into the overlapping portion of the bag formed by the second folding mechanism. And a fourth folding mechanism, wherein the fourth folding mechanism is arranged in the overlapping portion by being positioned on the bag mouth closed by the first folding mechanism prior to folding by the second folding mechanism. Before inserting the tongue by the fourth folding mechanism A base plate that lifts the edge of the bag in the overlapping portion to open the overlapping portion, a guide plate that supports the folding of the tongue portion from the inside, and an auxiliary member that holds the tongue portion between the guide plate. , And a lift mechanism for separating the guide plate holding the tongue-shaped portion and the auxiliary member from the base plate when folding.

Further, in the automatic folding device, a cylinder which is inserted from a bag mouth of a cylindrical bag in which disk-shaped works are stored in a laminated state and is brought into contact with an inner surface of the bag before being folded by the first folding mechanism. A centering piece having a surface may be provided.

Further, the second folding mechanism may include a side guide that supports a semi-cylindrical crushed portion that is folded toward the substantially diameter side of the bag mouth from a direction opposite to the side guide.

Further, the fourth folding mechanism is provided with a plate-shaped member that is brought closer to the bag mouth in the axial direction of the bag and closer to the bag radial direction, and presses the tongue-shaped portion by the tip thereof. It is effective that the strip-shaped member is provided so that its tip is inclined so as to be close to the tongue.

[Operation] According to the bag mouth automatic folding device having the above-described configuration, the base plate arranged in the overlapping portion lifts the edge of the bag to open the overlapping portion, so that the opening of the overlapping portion can be reliably widened. As a result, the tongue portion can be easily inserted by the fourth folding mechanism, and the bag mouth can be surely folded. In this case, since the tongue portion is sandwiched by the guide plate that supports the folding by the fourth folding mechanism from the inside and the auxiliary member, the tongue portion is stably supported so as not to bulge or sag when folded. At the same time, it is possible to support the bendable tip in a deformable manner so that excessive pulling does not act on the tongue. Further, by separating the guide plate and the auxiliary member sandwiching the tongue-shaped portion from the guide plate when the tongue-shaped portion is folded by the operation of the lift mechanism, a space for lifting the overlapping portion by the base plate is secured, and the tongue-shaped portion is secured. It is possible to sufficiently widen the frontage of the overlapping portion for inserting the tip of the.

Further, in the above automatic folding device, if the centering piece is provided, the cylindrical surface of the centering piece is brought into contact with the inner surface of the bag prior to folding by the first folding mechanism, and the bag mouth is concentric with the disk-shaped work. It is possible to form it in a substantially accurate cylindrical shape which is arranged in. As a result, the folding work from the first folding can be performed accurately and surely thereafter.

In the automatic folding device, the second folding mechanism is
If a side guide that supports a semi-cylindrical crushed portion that is folded toward the substantially diameter side of the bag mouth from the direction opposite to it is provided, the bag mouth that is pressed from one side by the second folding mechanism. Is supported by the side guides so as not to fall. This makes it possible to reliably form the tongue.

Further, in the above automatic folding device, the fourth folding mechanism includes a plate-like member that is brought closer to the bag mouth in the radial direction of the bag while being brought closer to the bag mouth in the axial direction, and presses the tongue-shaped portion by its tip. When the plate-shaped member is provided with the tip of the plate-shaped member inclined so that the tip of the plate-shaped member is close to the tongue-shaped part, the frictional force generated between the tongue-shaped part and the plate-shaped member is reduced. Is possible. As a result, the tongue-shaped portion smoothly slides along the tip of the plate-shaped member and is inserted into the overlapping portion without being subjected to an excessive pulling force by the plate-shaped member.

[Embodiment] FIGS. 1 to 11 are views showing an embodiment of the present invention. Here, in order to make the embodiment easier to understand, the step of folding the bag mouth will be described with reference to FIG. 2 prior to the description thereof.

Before the start of folding (FIG. 2 (a)) Inside a cylindrical bag A, a plurality of can lids B (workpieces) are stored in advance so as to overlap each other. In this state, since the joint portion at the bottom of the bag A projects downward,
Press the can lid B from above to flatten the bottom.

First fold ((b) in the figure) The bag mouth is crushed into a substantially semi-circular shape so that one side thereof contacts the other side. As a result, the bag mouth is closed and a flat portion C of the bag is formed on the top of the can lid.

Second fold ((c) in the same figure) Fold one side of the bag mouth, which is crushed into a semicircular shape, in a substantially diametrical direction of the bag mouth. As a result, the tongue-shaped portion D is formed on the other side of the bag mouth, and the overlapping portion E is formed between the flat portion C and the folded bag. In addition, a fold F is made at the lower end of the tongue D.

Third fold (FIG. 3D) The tongue D is folded along the fold F in the substantially diametrical direction of the bag mouth.

Fourth fold ((e) in the figure) The tip of the tongue D is bent and inserted into the overlapping portion E.

Forming the upper part of the bag ((f) in the figure) In the state of the fourth fold, the folded portion of the bag mouth slightly protrudes from the outer periphery of the bag A, which may hinder storage and packing. Therefore, by bending the protruding portion downward, the form of the bag A is adjusted and the folded portion is strengthened so as not to be easily released.

Molding the lower part of the bag ((g) in the figure) When the can lid is housed inside the bag, both edges of the joined bottom protrude in the left and right direction.Therefore, the protruding part is bent inward to adjust the form.

Next, the configuration of the device for folding the bag mouth based on the above steps will be described.

FIG. 1 is a schematic view showing the entire bag mouth folding device.

Reference numeral 1 in the figure is a frame. Frame 1 is the left frame
1a and a right frame 1b, and holds the bag A in an upright state, and the first work stage (the position of the bag A on the arrow Y side in the figure) and the second work stage (the bag A on the arrow X side) position)
It has a transport mechanism (not shown) that temporarily stops at and transports forward (in the direction of arrow X). A gate-shaped pedestal 2 is attached to the rear side of the right frame 1b. Shafts 3 and 3 are attached to the upper part of the pedestal 2 with their axes oriented in the front-rear direction, and a slide block 4 of a rodless cylinder is supported on the shafts 3 and 3 so as to be self-propellable in the front-rear direction.

An air cylinder 5 with a piston rod 5a directed downward is attached to the slide block 4, and a bracket 6 that is bifurcated in the front-rear direction is attached to the piston rod 5a. A push piece 7 is attached to the lower front end of the bracket 6. The pushing piece 7 pushes the upper surface of the can lid B in the bag A by extending the piston rod 5a of the air cylinder 5, whereby the bag A
The bottom portion of is pressed against a table (not shown) of the transport mechanism to form a substantially flat surface. A centering piece 8 is attached to the rear lower end of the bracket 6. When the centering piece 8 is inserted into the bag A, the center of the bag A and the can lid B are aligned with each other by uniformly spreading the bag A toward the outer peripheral side. A level detecting sensor (not shown) is attached inside the centering piece 8.
The level detecting sensor measures the distance to the lower can lid B when the centering piece 8 is inserted into the bag A and is located at the lower end, and based on the measurement result, the conveyance mechanism The position of the upper surface of the can lid B in the bag A is adjusted by a vertically moving mechanism (not shown).

An air cylinder 9 is arranged below the pedestal 2 with the piston rod 9a facing leftward, and a sleeve holder (first folding mechanism) 10 is attached to the piston rod 9a. The left side surface of the sleeve holder 10 is formed into a concave curved surface having a semicircular arc shape in plan view, and its radius of curvature is set to be slightly larger than the radius of the can lid B. On the other hand, an air cylinder 11 with the piston rod 11a facing the sleeve holder 10 is attached to the left frame 1a.
A semi-circular guide (first folding mechanism) 12 is attached to a via a slide 12b slidably supported by a guide rail 12a. The right side surface of the semicircular guide 12 is formed into a semi-circular convex curved surface, and is loosely fitted to the sleeve holder 10.

Next, near the center of the right frame 1b, a second folding plate 13 is arranged which is movable by the rodless cylinder 13a toward the second work stage side and the opposite direction. The second folding plate 13 has a tip end portion which is curved upward, and a right side portion which is cut out so that the width gradually becomes narrower toward the tip end side. It is located at. The second folding plate 13 may be a slightly thick plate body having a tip end surface formed into a convex curved surface having an arcuate cross section.

The guide plate 14 is provided on the right side of the second folding plate 13.
Are arranged. The guide plate 14 is formed by cutting out the right side of the tip into a rectangular shape, and the side edge of the cutout is brought into contact with the inside of the tongue D in FIG. 2 (c). The fold F at the time of the third folding is added. As shown in FIG. 4, the guide plate 14 is supported by a shaft 15 attached to the right frame 1b, and a slide block 16 that can be self-propelled in the axial direction thereof is provided on the side of the second work stage and its reverse side. It can be moved in any direction. Also, the guide plate
The lift mechanism 14a is configured to be slidable in the vertical direction.

On the other hand, a side guide 17 is arranged on the opposite side of the guide plate 14 across the second work stage. The side guide 17 is a substantially rectangular plate body in which the upper end of the tip is cut out in a triangular shape, and the right surface thereof is brought into contact with the side portion of the semi-cylindrical portion in FIG. This is to prevent the same side portion (portion that should become the tongue-shaped portion D) from collapsing during bi-folding. The side guide 17 is movable to the second work stage side and the opposite direction by a slide block 19 supported by a shaft 18 attached to the left frame 1a so as to be able to move in the axial direction thereof. The second folding plate 13, the guide plate 14, and the side guides 17 constitute a second folding mechanism. A third folding mechanism is provided on the right side of the side guide 17. The third folding mechanism includes a third folding plate (auxiliary member) 20.

The third folding plate 20 is a substantially rectangular plate body whose upper and lower surfaces are horizontally positioned, and the tip end portion thereof is formed to be inclined with respect to the longitudinal direction and curved upward. The third folding plate 20 is for folding the tongue portion D shown in FIG. 2 (c) in a substantially diametrical direction of the bag A,
The second work stage bag A is supported by the slide block 22 supported by the shaft 21 attached to the right plate 1b.
It can be moved from side to side and vice versa. Also,
The third folding plate 20 is slidable in the vertical direction by a lift mechanism 20a. The third folding plate
20 may be formed by forming the tip end surface of a slightly thick plate into a convex curved surface having an arcuate cross section.

In the Y direction of the side guide 17, the base plate 23
Are arranged. The base plate 23 has a plate-like shape with its upper and lower surfaces positioned horizontally, and its tip is formed in a triangular shape in plan view. The base plate 23 is positioned on the flat portion C shown in FIG. 2 (b), and serves as a receiver for the bag A that is folded during the second to fourth folds. It is movable to the second work stage side and the opposite direction.

That is, gate-shaped pedestals 2a and 2a are attached to the left frame 1a, which are separated from each other in the left-right direction. Pedestal 2a ・ 2a
As shown in FIG. 6, a plate 24 is installed on the plate 24, and a shaft 26 is attached to the plate 24 via a frame 25. The shaft 26 supports a slide block 27 that is self-propelled in the axial direction, and the base plate 23
Are attached to the slide block 27 via a plate 28.

A lifter 29 is attached to the base plate 23 as shown in FIG. The lifter is for widening the frontage of the overlapping portion E shown in FIG. 2 (d), and the left end is rotatably supported by the base plate 23 so that the right end can project from and retract into the upper surface of the base plate 23. It was done. As shown in FIG. 6, the lower surface of the lifter 29 is rotatably connected to a piston rod 30a of an air cylinder 30 attached to the lower side of the base plate 23.

Further, a fourth folding mechanism 31 is arranged above the base plate 23 including the base plate 23. The fourth folding mechanism 31 inserts the tongue-shaped portion D shown in FIG. 2D into the overlapping portion E, and is attached to the upper surface of the pedestal 2a.

That is, the support base 32 is attached to the upper surface of the pedestal 2a. The support base 32 has a feed screw 33 with the axis directed to the left and right.
Is rotatably supported around the axis. This lead screw
33 is rotatable by a stepping motor 34a connected to the end portion thereof via a coupling 34. A slide frame 36 is supported on the feed screw 33 via nut members 35. A guide rail 37 whose longitudinal direction is oriented vertically is attached to the lower surface of the right end of the slide frame 36, and a slide 38 is supported by the guide rail 37 so as to be vertically slidable. This slide 38
Are slidable by an air cylinder 39 attached to the slide frame 36. And slide
A fourth folding plate 40 is attached to 38. The fourth folding plate 40 is formed by bending a rectangular plate body, and its tip is formed so as to be inclined downward. The fourth folding mechanism 31 has the third
The guide plate 14 and the third folding plate 20 used in the folding mechanism and the lift mechanisms 14a and 20a for moving them upward are also included as its constituent elements.

On the other hand, a sleeve guide 41 is arranged on the opposite side of the fourth folding mechanism 31 across the second work stage. The sleeve guide 41 supports the bag A so as not to fall over in the second to fourth folding, and the left side surface thereof is the can lid B.
It is formed into a concave curved surface with a curvature slightly larger than the radius of. The sleeve guide 41 is movable in the bag A side and the opposite direction by a slide block 43 supported by a shaft 42 attached to the right plate 1b so as to be self-propellable in the axial direction.

Further, an upper holding mechanism 44 is arranged in the Y direction of the fourth folding mechanism 31. The upper holding mechanism 44 presses the upper part of the folded bag A and bends the part protruding from the outer periphery of the bag A downward to adjust the form of the bag A and prevent the folded part from being easily released. It strengthens and is structured as follows.

That is, the guide rail 46 is attached to the left frame 1a via the plate 45, and the slide 47 is slidably supported by the guide rail 46. A column 48 is attached to the slide 47. And slide 47
Is slidable toward the bag A side and the opposite side by an air cylinder 49 connected to the support column 48. A guide rail 50 whose longitudinal direction is oriented vertically is attached to the column 48, and a vertical slide 51 is slidably supported on the guide rail 50. Vertical slide 51,
It is slidable by an air cylinder 52 attached to the column 48. An upper molding guide 53 is attached to the vertical slide 51 via an arm 54. The upper molding guide 53 has a bottomed cylindrical shape, and its inner diameter is set to be slightly larger than the outer diameter of the bag A.
A pressing pad 55 is attached inside the upper molding guide 53.

On the other hand, as shown in FIG. 7, under the second work stage, hands 56, 56 for gripping the bag A are arranged so as to be movable in the vertical direction, and further under the hands 56, 56, Lower molding guides 57, 57 are arranged. Lower forming guide 57
When the piston rod 58a of the air cylinder 58 is extended, it comes into contact with the protrusion G at the bottom of the bag A and bends it inward.

Next, the operation of the bag mouth folding device will be described.

Before the start of folding, the transport mechanism provided in the frame 1 transports the bag A having the can lids B ... Stored therein to the first work stage. At this time, the bag A is in a state of being placed on the table provided in the transport mechanism. Then, the pressing piece 7 descends and presses the upper surface of the uppermost can lid to flatten the bottom of the bag A. Next, as the pushing piece 7 rises, the slide block 4 moves in the direction of the arrow X in FIG. 1 to move the centering piece 8 above the bag A. Next, the centering piece 8 descends and is inserted into the bag A, and the bag A is evenly spread to the outer peripheral side.
The centers of and match. At the same time, the level detection sensor in the centering piece 8 measures the distance to the uppermost can lid B in the bag A, and the vertical movement mechanism of the transport mechanism moves the table in the vertical direction based on the measurement result. The upper and lower positions of the uppermost can lid B are set to predetermined positions. The reason why such an operation is required is as follows.

That is, the can lid B is used for an aluminum can for drinking water or the like, and its peripheral portion is curved for tightening with the can body. For this reason, the total height of the can lids B varies when the can lids B are stacked, and the uppermost can lid B must be folded in order to fold the bag mouth under certain conditions.
It is necessary to keep the upper and lower positions of the first folding centering piece 8 constant, after the first folding centering piece 8 is raised, the sleeve holder 10 moves forward to contact the outer periphery of the bag A, and then the semicircular guide 12 moves forward. Crush the bag mouth into a semi-circular shape so that one side contacts the other side. As a result, the bag mouth is closed, and the flat portion C of the bag A is formed on the upper portion of the can lid.

After the second folding sleeve holder 10 and the semicircular guide 12 are retracted, the transport mechanism moves the bag A to the second work stage. Next, the sleeve guide 41 moves forward to come into contact with the outer periphery of the bag A, the base plate 23 moves forward to be positioned on the flat portion C, and the side guide 17 moves forward to move the substantially semicircular portion of the bag mouth. It contacts the inside (see Fig. 8). Next, the second folding plate 13 advances to fold one side of the bag mouth, which is crushed into a substantially semi-circular shape, in the substantially diametrical direction of the bag mouth. At this time, since the side guide is in contact with the portion of the bag mouth that is crushed into a substantially semicircular shape, it is supported so as not to fall over without being bent by the pressing force of the second folding plate. As a result, the tongue-shaped portion D is formed on the other side of the bag mouth, and the overlapping portion E is formed between the flat portion C and the folded bag.

Third Fold The second fold plate 13 retracts, the guide plate 14 advances and contacts the lower part of the tongue D (see FIG. 9). Furthermore, after the side guides 17 are retracted, the third folding plate
20 advances and folds the tongue portion D in the substantially diametrical direction of the bag mouth.

The fourth folding guide plate 14 and the third folding plate 20 rise slightly to widen the gap H between the base plate 23 and the guide plate 14 (see FIG. 10). This ensures a space that allows the lifter 29 provided on the base plate 23 to rotate. Also, along with this, the tongue D
Is held by the guide plate 14 and the third folding plate 20 in a state in which the portion disposed above the overlapping portion E is sandwiched, so that the tip of the tongue D is deformably supported and the tongue D is held. Even if the tip of D is deformed, the tongue D is held so as not to bulge or sag.

Then, subsequently to this, the lifter 29 rotates to lift the edge of the bag A and widen the frontage of the overlapping portion E. At the same time, the fourth folding plate 40 advances and descends, pushing down the tip of the tongue D (see FIG. 11). Then the 4th folding plate
40 moves forward. Then, first, the portion of the tongue-shaped portion D pressed by the fourth folding plate 40 enters the overlapping portion E, and subsequently, the portion on the more distal side is drawn into the overlapping portion E, and the tongue-shaped portion D The insertion is complete. At this time, the fourth
The folding plate 40 is moved forward without contacting only the tip of the folding plate 40 with the tongue D and pressing the tongue D with the base plate 23. Therefore, the deformably supported tongue D smoothly slides on the tip of the fourth fold plate as the fourth fold plate advances, without being subjected to a force such as being pulled toward the tip. However, it will be inserted into the overlapping portion E. Then, at this time, the lifter 29 is pushed down.

Bag upper part formation After the fourth fold plate 40, the third fold plate 20, the base plate 23, the guide plate 14, and the sleeve guide 41 are respectively retracted, the upper molding guide 53 is advanced and further lowered, so that the folded part of the bag A is at the upper part. It is inserted into the molding guide 53. Then, the pressing pad 55 presses the folded portion, and the portion slightly protruding from the outer periphery is bent downward. As a result, the shape of the bag A is adjusted and the folded portion is strengthened so as not to be easily released.

Lower bag forming The bag A is squeezed by grasping the bag A with the hands 56 and 56 and moving in the vertical direction. Next, the lower molding guides 57 and 57 move forward to bend both edges of the bottom portion of the bag A inward to adjust the shape of the bag A. Then, the bag A is taken out by the transport mechanism.

The bag A is continuously conveyed, and the folding at the second work stage and the folding at the first work stage are performed simultaneously.

In the above-described bag mouth automatic folding device, the edge of the bag A is lifted by the lifter 29 provided on the base plate 23 disposed below the overlapping portion E formed by the second folding, whereby the overlapping portion E is lifted. Because the frontage is widened,
Extremely smooth tongue D without any trouble
Can be inserted into the superposition section E. Moreover, in order to secure a space for lifting the bag A by the lifter 29, the tongue-shaped portion D sandwiched by the third folding plate 20 and the guide plate 14 is moved in the direction away from the base plate 23 by the operation of the lift mechanisms 14a and 20a. Therefore, the lifter 29 can be operated smoothly to surely widen the frontage of the overlapping portion E. The tongue D is sandwiched between the third folding plate 20 and the guide plate 14 so that the tip of the tongue D is deformably supported and is prevented from bulging or sagging even when the tip is deformed.
This prevents the tongue-shaped portion D pressed by the fourth folding plate 40 from being subjected to an unreasonable tensile force, and the bag is folded without tearing. Therefore, the folding operation of the bag mouth can be surely automated. Furthermore, since the position of the uppermost can lid B is always fixed by the level detection sensor and the transport mechanism before folding, the can lid B can be packed without leaving a large gap in the bag A, and Since the shape of the upper part of the bag A is adjusted by the upper forming guide 53 and the pressing pad 55 and the lower part of the bag A is adjusted by the lower forming guide 57, the bag A can be easily transported and stored, and the folding portion can be easily formed. Since it is not easily released, it is possible to prevent occurrence of troubles in the lid manufacturing line and the like.

Although the lifter 29 is provided as a mechanism for lifting the edge of the bag A in the above embodiment, the invention is not limited to such a configuration, and for example, the tip of the base plate may be hinged to the base plate body. Further, the base plate itself may be rotatably provided so that its tip is lifted.

[Effects of the Invention] As described above, in the bag mouth automatic folding apparatus of the present invention, the bag mouth of the cylindrical bag having the work accommodated therein is substantially semi-cylindrical so that one side thereof contacts the other side. A first folding mechanism that crushes the bag into a shape, a second folding mechanism that folds one side of the semi-cylindrical crushed portion of the bag mouth toward a substantially diameter side of the bag mouth, and a second folding mechanism that folds the other. A third folding mechanism that folds the tongue-shaped portion left on the side toward the approximately diameter side of the bag mouth,
A fourth folding mechanism that folds the tip of the tongue-shaped portion and inserts it into the overlapping portion of the bag formed by the second folding mechanism, and the fourth folding mechanism makes the first folding before the folding by the second folding mechanism. A base plate which is disposed in the overlapping portion by being positioned on the bag mouth closed by the mechanism, and which lifts the edge of the bag in the overlapping portion to open the overlapping portion before inserting the tongue portion by the fourth folding mechanism; Guide plate for supporting the folding of the tongue portion from the inside, an auxiliary member for sandwiching the tongue portion between the guide plate, and a lift mechanism for separating the guide plate and the auxiliary member sandwiching the tongue portion from the base plate when folding Since it is equipped with and, the particularly difficult insertion of the tongue into the overlapping portion can be performed very easily, and therefore the bag mouth The write operation can be reliably automated.

Further, in this automatic folding device, prior to folding by the first folding mechanism, a cylindrical bag is inserted from a bag mouth of a cylindrical bag in which disc-shaped works are stored in a stacked state and brought into contact with the inner surface of the bag. If the structure is provided with the centering piece having a surface, the bag can be set concentrically with the work piece into a substantially accurate cylindrical shape before the folding work, so that the accurate folding work can be performed. It can be carried out.

In addition, in this automatic folding device, the second folding mechanism is
If it is provided with a side guide that supports the semi-cylindrical crushed portion that is folded toward the substantially diameter side of the bag mouth from the direction opposite to it, the bag mouth that is pressed from one side is Since it is supported so as not to fall down, it is possible to prevent the bag mouth from being deformed against the intention and to form a desired fold line.

Further, in this automatic folding device, the fourth folding mechanism includes a plate-like member that is brought close to the bag mouth in the axial direction of the bag while being brought close to the bag radial direction and presses the tongue-shaped portion by its tip. In addition, if the plate-shaped member is provided so as to be inclined so that its tip is close to the tongue-shaped portion, it can be inserted into the overlapping portion without applying an unreasonable tensile force to the tip of the bag. You can As a result, it is possible to prevent tearing of the tongue.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 11 are views showing an embodiment of the present invention. FIG. 1 is a perspective view showing the entire bag mouth folding device, and FIG. FIG. 3 is a perspective view for explaining the process, FIG. 3 is a view taken along the line III-III in FIG. 1, FIG. 4 is a view taken along the line IV-IV in FIG. 1, and FIG. -V line arrow view, FIG. 6 is a VI-VI line arrow view of FIG. 1, FIG. 7 is a perspective view showing a lower molding guide, and FIG. 8 is a state in which the second folding is performed. FIG. 9 is a perspective view for explaining a state in which the third folding is performed, FIG. 10 is a cross-sectional view showing a state in which the third folding is completed, and FIG. 11 is a fourth folding. It is sectional drawing which shows the state. A: bag, B: can lid (work), D: tongue, E: overlapping part, 10: sleeve holder (first folding mechanism), 12 ... semi-circle guide (first folding mechanism) ), 13 ... second folding plate (second folding mechanism), 14 ... guide plate, 20 ... third folding plate (third folding mechanism), 23 ... base plate, 40 ... fourth folding plate (fourth folding plate) 4 folding mechanism).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Owada 85-14 Kamenoo, Joban Mizunotani-cho, Iwaki City, Fukushima Prefecture Iwaki Technical Center (56) References JP-A-60-217908 (JP) , A)

Claims (4)

[Claims] 1. A first folding mechanism for crushing a bag mouth of a cylindrical bag having a work stored therein into a substantially semi-cylindrical shape so that one side thereof contacts the other side, and a semi-cylindrical shape of the bag mouth. A second folding mechanism that folds one side of the crushed portion toward the substantially diameter side of the bag mouth, and a tongue-shaped portion left on the other side due to the folding of the second folding mechanism to the substantially diameter side of the bag mouth. The third folding mechanism includes a third folding mechanism for folding the tongue-shaped portion, and a fourth folding mechanism for folding the tip of the tongue-shaped portion and inserting the folded portion into the overlapping portion of the bag formed by the second folding mechanism. Prior to the folding by the second folding mechanism, it is positioned on the bag mouth closed by the first folding mechanism to be arranged in the overlapping portion, and the overlapping portion is inserted before the tongue-shaped portion is inserted by the fourth folding mechanism. Lift the edge of the bag at and open the overlapping part A base plate, a guide plate that supports the folding of the tongue from the inside, an auxiliary member that holds the tongue between the guide plate, and a guide plate that holds the tongue and the base plate when folding the auxiliary member An automatic folding device for a bag mouth, comprising a lift mechanism for separating the bag mouth from the bag. 2. Before the folding by the first folding mechanism, the cylindrical bag has a cylindrical surface which is inserted from the bag mouth of the cylindrical bag in which the disk-shaped works are stored in a stacked state and is brought into contact with the inner surface of the bag. The automatic folding device for the bag mouth according to claim 1, further comprising a centering piece. 3. The second folding mechanism is provided with a side guide that supports a semi-cylindrical crushed portion that is folded toward the substantially diameter side of the bag mouth from a direction opposite to the side guide. An automatic folding device for a bag mouth according to claim 1. 4. A fourth folding mechanism is provided with a plate-like member which is brought closer to the bag mouth in the axial direction of the bag and closer to the bag mouth in the radial direction and presses the tongue-shaped portion by its tip. The automatic folding device for a bag mouth according to claim 1, wherein the plate-shaped member is provided with its tip inclined so as to be close to the tongue-shaped portion.