JPH11278440A - Mechanism for flattening mouth of filling bag and bag mouth shaping apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag mouth flattening mechanism which can reliably flatten a bag mouth of a filling bag filled with grains or the like and a bag mouth shaping apparatus for the filling bag which can reliably flatten the bag mouth of the filling bag and regulate the height of the bag mouth. SOLUTION: A pair of claws 21A, 21B of a bag mouth flattening mechanism inserted into the bag mouth of a filling bag 5 are respectively rotatably pivoted to a pair of claw holding frames 24A, 24B which are laterally driven while being mounted on a vertically movable bag mouth pressing board 12 for pressing the bag mouth of the filling bag 5 to regulate its height, and lower parts inserted via a slit opened on the bag mouth pressing board 12 into the bag mouth below are energized in such a direction that they come farther away from each other by a spring 28B. Thus the pair of claws 21A, 21B are appropriately rotated against force of the spring 28B so that their lower parts conform to a shape of both end faces of the bag mouth of the filling bag 5 to constantly pull both end faces of the bag mouth in parallel, thereby reliably flattening the bag mouth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic packaging machine for granules such as grains and the like. The present invention relates to a bag lining mechanism for feeding a filling bag to a bag opening sealing device, and a bag opening forming apparatus provided with the bag lining mechanism.

[0002]

2. Description of the Related Art In an automatic packaging machine for granules such as grains, after filling granules such as grains into bags with a filling machine,
The filling bag in which the bag mouth is open is sent to the bag mouth sealing device, and the bag mouth of the filling bag is sealed with a sewing machine or binding with a bag cord in the bag mouth sealing device. Before the filling bag is fed into the bag opening sealing device, the opened mouth portion of the filling bag is flattened beforehand so that the bag opening in the bag opening sealing device can be quickly and reliably sealed. Various types of bag-mouth forming apparatuses for forming the bag mouth into a flat shape have conventionally been employed.

[0003]

In a conventional automatic packaging machine for granules such as grains, a bag mainly made of paper is used as a bag for filling grains and the like. When placed on a conveyor or the like from the filling machine and transferred to the bag mouth closing device, the filling bag is placed in the position, shape, or bag depending on the type and filling weight of the granular material such as grains. The mouth height changes. Therefore, although the height of the bag mouth is regulated and the bag mouth is flattened at the time of forming the bag mouth by the bag mouth forming apparatus, the height of the bag mouth is shifted during the bag mouth sealing stage,
In many cases, it is not always possible to automatically and accurately perform satisfactory bag mouth sealing, for example, due to bending of the bag mouth sealing portion.

[0004] That is, when the bag mouth of the filling bag is sealed by sewing with a sewing machine or binding of a bag string, if the height of the bag mouth is not always constant, the bag mouth is properly sealed. Can not do. For example, when the bag mouth is not sufficiently flattened when the bag mouth is sealed by sewing, if the right and left heights of the bag mouth are different, the sewing line of the sewing machine is bent, and the bag mouth is completely sealed. Can not be done. In addition, when binding the filling bag with the binding device, if the height of the bag opening of the filling bag is not constant, it is difficult to detect the position of the filling bag, and the binding of the binding bag is difficult. There was something I couldn't do.

The flattening of the bag mouth of the filling bag is usually performed by inserting a pair of claws or the like into the bag mouth of the filling bag and moving the pair of claws so as to widen the gap. However, with only such movement of the pair of claws, in a filled bag filled with grains or the like, although the vicinity where the tip of the claw abuts is expanded, the upper edge of the bag mouth is sufficiently enlarged. In many cases, the bag mouth cannot be reliably flattened without being expanded, which also affects the bag mouth sealing work, and the bag mouth cannot be properly sealed. Was.

The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and it is an object of the present invention to surely flatten a bag mouth of a filling bag filled with grains and the like. It is possible to reliably perform the filling of the bag mouth of the filling bag, the flattening of the bag mouth of the filling bag and the regulation of the height of the bag mouth, and it is possible to feed the bag into the bag mouth sealing device while maintaining the state. It is an object of the present invention to provide a filling port forming apparatus for a filling bag which can be formed.

[0007]

In order to achieve the above object, a bag opening mechanism for a filling bag according to the present invention comprises inserting a pair of claws into a bag opening of a filling bag filled with grains or the like, and Are moved so as to be spaced apart from each other, and the pair of claws are driven so as to approach and separate from each other in a bag covering mechanism that flattens the bag opening by pulling both end surfaces of the bag opening. It is characterized in that the portions to be rotatably held by the claw holding frames and the portions to be inserted into the bag mouth of the filling bag are spring-biased in a direction away from each other.

Further, in the bag filling mechanism of the filling bag according to the present invention, the bag covering mechanism is mounted on a support plate which is driven in a vertical direction, and is lowered downward through an elongated slit formed in the support plate. A pair of claws are arranged so as to protrude, and a stopper is provided on the support plate for rotating the claws protruding downward at a position where the pair of claws approach each other so as to further approach them against a spring biasing force. Is preferred.

The bag opening forming apparatus for a filling bag according to the present invention comprises a bag opening holding plate for regulating the height of the filling bag by pressing the bag opening edge of the filling bag filled with grains or the like from above. A height regulating mechanism movably provided up and down, and a pair of claw holding frames mounted on the bag mouth holding plate and driven to approach and separate from each other; A portion of the filling bag, which protrudes downward through an elongated slit formed in the holding plate and is inserted into the bag mouth of the filling bag, has a pair of claws biased in a direction away from each other, and is provided with the bag mouth holding plate. A bag opening mechanism configured to insert the pair of claws into the bag opening of the filling bag at the same time as the height regulation of the filling bag and to open the bag opening by moving the pair of claws away from each other. I do.

Further, the bag opening forming apparatus for a filling bag according to the present invention is mounted below the bag opening mechanism, and holds both upper end portions of the filling bag with two holding plates, respectively. Are further provided with a bag upper holding mechanism configured to move so as to be apart from each other to expand and hold the upper portion of the filling bag.

[0011] Further, the bag opening forming apparatus for a filling bag according to the present invention preferably further comprises a moving mechanism for moving the bag upper holding mechanism to the bag opening sealing device.

In the apparatus for forming a bag opening of a filling bag according to the present invention, the bag opening pressing plate of the height regulating mechanism is attached to the piston rod of the height regulating cylinder, and the height regulating cylinder is actuated up and down. It is preferable to be configured to move in the direction, furthermore, a pair of claws of the bag lining mechanism,
A pair of claw driving cylinders fixed on the bag mouth holding plate are rotatably held on a pair of claw holding frames respectively attached to the distal end portions of the piston rods. It is preferable that the pair of claws be separated from each other or approach each other by the expansion and contraction of the rod.

In the apparatus for forming a bag opening of a filling bag according to the present invention, the bag upper holding mechanism is arranged below the bag opening mechanism and is positioned along the conveying direction of the filling bag. Bags which are respectively attached to the distal ends of the piston rods of the expansion cylinders fixed to both sides of the holding frame so as to be movable in the conveying direction of the filling bag, and which are respectively opposed to both upper ends of the filling bag. Two first movable frames having a contact surface, and a direction perpendicular to the conveying direction of the filling bag, which is mounted on the distal end of the piston rod of the holding cylinder fixed to the first movable frame. The two second movable frames housed in each of the two first movable frames are movable.
A movable frame, two rotating arms respectively supported in the two second movable frames and driven to rotate by rotating cylinders fixed to the second movable frames, respectively; and a tip of the rotating arm And two holding plates that are attached to the respective portions and rotate between a position facing the bag contact surface of the first movable frame and a side position of the holding frame, The two holding plates are rotated by the rotation drive of the rotary cylinder, and the upper end of the filling bag located in front of the bag contact surface is held by the bag contact surface and the holding plate, and The holding plate is moved together with the second movable frame by the operation of the holding cylinder to press and hold the upper end of the filling bag against the bag contact surface, and then the first movable frame is operated by the operation of the expansion cylinder. In the direction in which the filling bag is transported away from Are allowed, it is preferably configured to hold the extended upper portion of the moved filled bag so as to be separated from each other the holding plate and the bag contact surface for holding the upper ends of the filled bladder.

In the apparatus for forming a bag opening of a filling bag according to the present invention, the moving mechanism for moving the bag upper holding mechanism to the bag opening sealing device is disposed at a distance in the conveying direction of the filling bag. A pair of sprockets, a drive chain that is wound around the sprockets and both ends of which are attached to a holding frame of the bag upper holding mechanism, and a forward / reverse rotatable drive motor that drives one of the pair of sprockets. It is preferable that the upper part holding mechanism for expanding and holding the upper part of the filling bag is moved.

[0015]

According to the bag filling mechanism of the present invention, both ends of the bag mouth portion of the filling bag filled with grains and the like are provided by using a pair of pawls which are biased by spring and are rotatable. Can be rotated appropriately against the urging force of the spring so as to correspond to the shape of (2) and pull the two end faces of the bag mouth portion of the filling bag in parallel, and that state can be maintained by the urging force of the spring. To
The upper part of the bag mouth can be reliably flattened in a straight line, and when the pair of claws are inserted into the inside of the bag mouth of the filling bag, the lower tips of the pair of claws are inclined inwardly toward each other and narrowed. In the state, the pair of claws can be smoothly inserted into the bag mouth.

In the apparatus for forming a bag opening of a filling bag according to the present invention, the opening of the filling bag in which grains and the like are weighed and filled in the filling machine is provided by the bag opening holding plate moving up and down by the height regulating mechanism. Is pressed from above, the height of the bag mouth is regulated, the upper edge of the bag mouth is made horizontal, and a rotatable pair of protruding parts is provided below the bag mouth tensioning mechanism mounted on the bag mouth holding plate. By moving the claw, the bag opening of the filling bag is stretched to the left and right to flatten it, the upper end portions of the filling bag are respectively held by two holding plates of the bag upper holding mechanism, and the two holding plates are separated from each other. And the upper part of the filling bag is extended and held, so that the height of the filling opening of the filling bag, the flattening of the filling opening, and the expansion of the upper part of the filling bag can be reliably performed.

Further, the filling bag may be sent to the bag opening sealing device while holding the filling bag in which the bag opening height is regulated, the bag opening is flattened and the upper portion of the filling bag is expanded by the bag opening forming device. In the bag mouth sealing device, the bag mouth of the filling bag can be quickly and reliably sealed by sewing with a sewing machine or tying a bag string.

[0018]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing a schematic configuration of a bag opening forming apparatus provided with a bag opening mechanism for a filling bag according to the present invention in relation to a filling machine and a bag opening sealing apparatus.

FIG. 1 is a perspective view of a bag mouth forming apparatus 1 for a filling bag according to the present invention.
As shown in FIG. 1, a filling machine 2 for metering and filling a granular material such as a grain into a bag made of paper or the like and a bag mouth of the filled bag 5 which is metered and filled are sealed by sewing with a sewing machine or binding a bag string. It is arranged between the bag mouth sealing device 3 and moves the bag mouth height regulating mechanism 10, the bag mouth tightening mechanism 20, the bag upper holding mechanism 30, and the bag upper holding mechanism 30 in the lateral direction (X-axis direction). It comprises a moving mechanism 50 for moving.

The filling bag 5 in which the granular material such as grains is weighed and filled in the filling machine 2 is transferred from the filling machine 2 onto a conveyor 4 such as a conveyor in a state where the bag mouth is opened and upright. It is conveyed to the bag opening forming device 1 by the conveying device 4. The bag mouth forming apparatus 1 controls the height of the bag mouth of the filling bag 5 by the height regulating mechanism 10, flattens the bag mouth by the bag mouth tensioning mechanism 20, and holds the filling bag 5 by the bag upper holding mechanism 30. While holding the upper part, the upper part of the filling bag 5 is further expanded, and then,
It is configured to transfer the bag upper holding mechanism 30 holding the filling bag 5 by the moving mechanism 50 to the bag mouth sealing device 3. Then, in the bag mouth sealing device 3, the filled bag 5 is sealed at the opened bag mouth by sewing with a sewing machine or binding a bag string.

Next, the height regulating mechanism 10 and the bag opening mechanism 20 in the bag opening forming apparatus 1 will be described.

As shown schematically in FIG. 1, the height regulating mechanism 10 is provided above an appropriate position of a conveyor 4 such as a conveyor that conveys the filling bag 5 from the filling machine 2. As shown in FIG. 3, a height regulating cylinder 11 fixed to an airframe (not shown), and a rectangular bag mouth holding plate 12 having a center portion fixed to a distal end portion of a piston rod thereof, The mouth holding plate 12 is moved in the vertical direction (Z-axis direction) by the operation of the height regulating cylinder 11, and presses the opened mouth of the filling bag located below the height regulating mechanism 10 from above to open the mouth. The upper edge portion is horizontally regulated. If the bags used for filling grains and the like have different sizes and heights, the height of the bag mouth sealing portion differs according to the size and height of the bags. It is preferable that the descending distance of the height regulating cylinder 11 is adjustable so that the height of the bag mouth that regulates to correspond to the sealing portion can be appropriately adjusted. It is desirable to provide a guide member for guiding the movement of the bag mouth holding plate 12 in order to stabilize the vertical movement.

The bag mouth holding plate 12 has a slit 15
A and 15B are elongated in the opposite directions in the X-axis direction (transport direction of the filling bag 5) from portions adjacent to both sides of the height regulating cylinder 11, respectively.
Reference numeral 15B denotes claws 21A and 21B of a bag mouth opening mechanism 20 described later.
Are movably received, and the bag mouth holding plate 12
Side wall 1 erected upward on both side edges extending in the X-axis direction
7 and 18 are provided, and stoppers 19A and 19B are fixed between these side walls 17 and 18. These stoppers 19A and 19B are provided at upper ends of claws 21A and 21B of a bag opening mechanism 20 described later. Claw 21 in contact with each
A and 21B serve to position the lower end portions inward.

As shown in FIGS. 2 to 5, the bag opening mechanism 20 is a piston fixed to the upper surface of the bag opening holding plate 12 and extending and contracting in the conveying direction (X-axis direction) of the filling bag 5. Two claw driving cylinders 22A and 22B having rods 23A and 23B, respectively;
Claw holding frames 24A, 24B fixed along the tip ends of piston rods 23A, 23B of A, 22B and moving along guide shafts 16A, 16B fixed to the upper surface of bag mouth holding plate 12, and claw holding frames 24A. , 24B rotatably supported by the slits 15A, 15B of the bag mouth holding plate 12.
2 protruding downward from the bag mouth holding plate 12 through the
1A and 21B. The claw driving cylinder 22A, the claw holding frame 24A and the claw 21A and the claw driving cylinder 22B, the claw holding frame 24B and the claw 21B have the same structure, and the center of the bag mouth holding plate 12 is symmetrical. They are arranged point-symmetrically. 4 and 5, the pair of claws 21A and 21B are held between the claw holding frames 24A and 24B and the frame members 25A and 25B provided separately from the claw holding frames. The spring hooks 27A, 27B and the claws 21A, 2B are rotatably supported by the rotating shafts 26A, 26B, respectively, and are adjustably attached to the distal ends of the claw holding frames 24A, 24B.
The springs 28A and 28B are hung between a portion below the portion supported by the rotation shafts 26A and 26B of the 1B, and the lower tip portions of the claws 21A and 21B are respectively outwardly moved.
That is, the lower ends of the claws 21A and 21B are urged in a direction to separate from each other. 2 to 4
Illustrates the standby state of the bag lining mechanism 20, in which the piston rods 23A and 23B of the claw driving cylinders 22A and 22B are in a contracted state, and the claw holding frame 24
A, 24B and claws 21A, 21B are also at the innermost positions closest to each other. Therefore, the claws 21A, 21B
The upper ends of the springs 28A, 28B contact the stoppers 19A, 19B fixed to the bag mouth holding plate 12, respectively.
4, the lower ends of the claws 21A and 21B are positioned in an inwardly inclined state, as shown in FIG.

Claw driving cylinder 22 of bag lining mechanism 20
A and 22B are driven synchronously, and the claw driving cylinder 22 is driven.
A and 22B actuate each piston rod 23
When A and 23B are extended in the opposite directions along the X-axis direction, the claw holding frames 24A and 24B are moved to the guide shafts 16A and 1B.
6B, the claws 21A, 2A are moved in the direction away from each other, and are respectively supported by the claw holding frames 24A, 24B.
1B also moves in a direction away from each other along the slits 15A and 15B at the same time. When the claws 21A and 21B move outward from the standby state shown in FIG.
A, away from 19B, as shown in FIG.
8A and 28B to rotate and move with the lower end inclined outward. Also, the claw driving cylinder 2
Piston rods 23A, 23 by operation of 2A, 22B
Due to the contraction of B, the claws 21A and 21B
A and 24B return to a standby state close to each other. That is, as shown in FIG. 4, the upper ends of the claws 21 </ b> A and 21 </ b> B
9A and 19B, respectively, and the springs 28A and 28B
And the lower ends of the claws 21A and 21B are inclined inward.

Next, the operation of the height regulating mechanism 10 and the bag opening mechanism 20 configured as described above will be described. As shown in FIG. 1, when the filling bag 5 is conveyed from the filling machine 2 by the conveying device 4 and stopped below the height regulating mechanism 10, the bag mouth holding plate 12 of the height regulating mechanism 10 regulates the height. Is lowered in the Z-axis direction by the operation of the operating cylinder 11, and the lower surface thereof presses the opened bag mouth of the filling bag 5 from above, thereby regulating the height of the bag mouth upper edge of the filling bag 5. Control the part horizontally. The bag opening mechanism 20 includes a pair of claws 21A and 21B that project downward through the slits 15A and 15B of the bag opening holding plate 12 simultaneously with the lowering of the bag opening holding plate 12 due to the operation of the height regulating mechanism 10. Penetrates into the opened bag mouth of the filling bag 5. At this time, a pair of claws 2
1A and 21B are stoppers 1 as shown in FIG.
9A and 19B, the lower end portions thereof are inclined inwardly and narrowed toward each other, so that they can smoothly enter the bag opening of the filling bag 5. Then, with the extension of the piston rods 23A and 23B in the opposite directions by the operation of the claw driving cylinders 22A and 22B,
The pair of claws 21A, 21B move in the X-axis direction so as to be separated from the stoppers 19A, 19B and separated from each other, and as shown in FIG. 5, the lower portions of the claws 21A, 21B are pulled by the springs 28A, 28B. In the state of being inclined outwardly, the inside of the bag mouth of the filling bag 5 is moved in opposite directions to each other.
When the claws 21A and 21B hit the inner side end surfaces of the filling bag 5, first, as shown in FIG.
21B, the lower tip portions inclined outwardly strike the left and right end surfaces of the filling bag 5, and thereafter, as the claws 21A, 21B are further moved away from each other, the claws 21A,
21B is rotated appropriately against the urging force of the springs 28A and 28B so that the lower portions thereof correspond to the shapes of both end surfaces of the filling bag 5, and pulls both end surfaces of the bag mouth portion of the filling bag 5 in parallel. . Then, the nail holding frames 24A and 24B and the nail 21
When the movement of A, 21B is stopped, the claws 21A, 21B
Is held by the springs 28A and 28B in a state where both side end surfaces of the bag mouth of the filling bag 5 are pulled in parallel (see FIG. 6B). Therefore, the bag mouth of the filling bag 5 is reliably flattened in a straight line. As described above, when the bag mouth is to be pulled and flattened by the conventional pair of fixed claws, the vicinity of the tip of the claw is expanded, but the upper edge of the bag mouth is not sufficiently expanded. The problem that the mouth cannot be flattened reliably can be solved by using a pair of pawls that are spring-biased and freely rotatable by the bag covering mechanism.

Next, the bag upper holding mechanism 3 of the bag mouth forming apparatus 1
0 will be described. As shown in FIG. 1, the bag upper holding mechanism 30 disposed below the height regulating mechanism 10 and the bag opening mechanism 20 is located behind the conveying path of the filled bag 5 conveyed by the conveying device 4. In addition, it is positioned at a position corresponding to an upper portion slightly below the bag mouth of the filling bag 5, and from the position below the height regulating mechanism 10 and the bag mouth opening mechanism 20 to the bag mouth sealing device 3 by the moving mechanism 50. It is configured to be movable.

As shown in FIGS. 7 to 9, the bag upper holding mechanism 30 has a front wall 31a facing the upper portion of the conveyed filling bag, and a pair of beam members 31 attached to the front wall 31a.
d, a rear wall 31b arranged rearward in the front-rear direction (Y-axis direction) at a predetermined interval, and a rear wall 31b
And a holding frame 31 consisting of a horizontal wall 31c extending horizontally rearward (in the Y-axis direction) from the lower end of the rear wall 31b.
The axial length is formed longer on both sides than the front wall 31a,
Notches 31e, 31e are respectively formed at the upper portions of both side ends.
(Particularly, see FIGS. 7 and 8), and the length of the rear wall 31b in the vertical direction (Z-axis direction) is formed to be longer than the front wall 31a (particularly, ( a)). First movable frames (that is, X-axis movable frames) are respectively provided in front of the rear wall 31b at both end portions of the holding frame 31.
32, 32 and a second movable frame (that is, a Y-axis movable frame) 38, 38 are accommodated. Note that the X-axis movable frame 32 and the Y-axis movable frame 38 are all configured to be symmetrical in the left and right directions, and the following description will mainly focus on the members located on the right side in FIGS. 7 to 9.

The X-axis movable frame 32 has a bag contact surface 33 which is substantially the same as the front wall 31a of the holding frame 31 facing the upper portion of the conveyed filling bag and has substantially the same height. ,
The frame is formed in a rectangular shape in plan view and provided with a notch 34 over a part of the side surface and the front surface (bag contact surface 33) so that a rotation arm 41 described later can rotate. The movable frame 32 is attached to the tip of a piston rod 35a of an expansion cylinder 35 fixed to the beam member 31d of the holding frame 31, and the X-axis is moved in accordance with the expansion and contraction of the piston rod 35a by the operation of the expansion cylinder 35. It is configured to be movable in the direction. As shown in FIGS. 9A and 9B, the guide portion 36 formed on the lower surface of the X-axis movable frame 32 is fixed to the front side of the rear wall 31b of the holding frame 31. The X-axis movable frame 32 can be smoothly moved in the X-axis direction by moving along the guide shaft 31f.

The Y-axis movable frame 38 has a U-shape in front view (FIG. 9).
(A), and is accommodated in the X-axis movable frame 32. Then, the Y-axis movable frame 38
Is attached to the tip of the piston rod 39a of the holding cylinder 39 fixed to the rear surface of the X-axis movable frame 32,
The guide portion 37 of the Y-axis movable frame 38 is supported so as to move along a guide shaft 37 a fixed to the front and rear surfaces of the X-axis movable frame 32 opposed to each other. It is configured to be movable in the Y-axis direction according to the expansion and contraction movement of 39a.

The Y-axis movable frame 38 has a holding plate 40
Is provided so as to be rotatable about a rotation shaft 42. The rotation arm 41 is formed of a pair of plate members, and the rotation shaft 42 provided at one end thereof is a Y-axis movable frame. The other end portion protrudes from the U-shaped space of the Y-axis movable frame body 38 and the notch 34 on the side surface of the X-axis movable frame body 32 so as to be laterally supported by the holding frame body 31. It is configured to be located outside and has a rectangular holding plate 4 at its end.
0 is fixed. The rotating shaft 42 of the rotating arm 41 is connected to a rotating cylinder 4 fixed to a support 43 (see FIGS. 9A and 10) fixed to the lower surface of the Y-axis movable frame 38.
4 is connected via a coupling 45. Therefore, when the rotating shaft 42 is rotationally driven by the rotating operation of the rotating cylinder 44, the rotating arm 41 cuts the U-shaped space of the Y-axis movable frame 38 and the side and front surfaces of the X-axis movable frame 32. It turns through the notch 34 and turns in the direction of the arrow from the position shown by the solid line in FIG. 8 to the position shown by the two-dot chain line. Then, the holding plate 40 also rotates in the same manner, and finally X
It reaches a position facing the bag contact surface 33 of the shaft movable frame 32 at a certain interval. The holding plate 40 moves in the Y-axis direction together with the movement of the Y-axis movable frame 38 in the Y-axis direction by the operation of the holding cylinder 39, and further moves in the X-axis direction of the X-axis movable frame 32 by the operation of the extension cylinder 35. It can move in the X-axis direction with the movement of. Therefore, the filling bag is conveyed to the front of the bag upper holding mechanism 30, and the height regulating mechanism 10 and the bag opening mechanism 20
With respect to the filling bag in which the bag mouth height is regulated and the bag mouth is stretched, the two holding plates 40 are respectively operated by the operation of the rotary cylinders 44 so that the bag contact surface 33 of the X-axis movable frame 32 is held. Is rotated to a position opposite to the front side, so that both ends of the upper portion of the filling bag are held slightly, and the Y-axis movable frame 38 is moved rearward in the Y-axis direction by the operation of the holding cylinder 39 and held. The plate 40 also moves backward in the Y-axis direction, and presses both ends of the upper part of the filling bag 5 against the bag contact surface 33 of the X-axis movable frame 32, respectively. The filling bag is sandwiched and held between them. Further, with the movement of the X-axis movable frame 32 in the X-axis direction due to the operation of the expansion cylinder 35, both ends of the upper portion of the filling bag 5 are held between the holding plate 40 and the bag contact surface 33. As a result, both ends of the upper portion of the filling bag 5 are pulled in directions opposite to each other in the X-axis direction, and the upper portion of the filling bag 5 is further expanded and held in a flat state.

The moving mechanism 50 of the bag upper holding mechanism 30
As schematically shown in FIGS. 1 and 11, the bag upper holding mechanism 30 is moved between the position where the height regulating mechanism 10 of the bag opening forming device 1 is disposed and the bag opening sealing device 3 by X. It is configured to be able to reciprocate in the axial direction. Both ends of the drive chain 51, which is stretched over a pair of sprockets 52, 53 arranged apart from each other, are fastened to the center of the lower surface of the horizontal wall 31c of the holding frame 31 of the bag upper holding mechanism 30, and one of the sprockets A drive motor 54 that can rotate forward and reverse is connected to the shaft 52 via a coupling. Drive chain 51
A pair of guide shafts 55, 56 are provided on both sides of the pair of guide shafts 55, 56. A plurality of guide bodies 57, 57... Provided on the lower surface of the horizontal wall 31 c of the bag upper holding mechanism 30 are arranged along the pair of guide shafts 55, 56. To guide the reciprocal movement of the bag upper holding mechanism 30 in the X-axis direction.

Next, the operation of the bag mouth forming apparatus of the present invention having the above-described structure will be described.

As shown in FIG. 1, the filling bag 5 in which the granular material such as grains is weighed and filled in the filling machine 2 is opened from the filling machine 2 to a conveyor or the like with the bag mouth open and upright. It is transferred onto the transport device 4 and the bag mouth forming device 1 is transported by the transport device 4.
And stops below the height regulating mechanism 10. Thereafter, the height regulating cylinder 1 of the height regulating mechanism 10
By the operation of 1, the bag mouth pressing plate 12 is lowered in the Z-axis direction, and the lower surface thereof presses the opened bag mouth of the filling bag 5 from above, thereby regulating the height of the bag mouth upper edge portion, and Control the part horizontally.

Then, as described above, the bag mouth holding mechanism 20 moves simultaneously with the lowering of the bag mouth holding plate 12 by the operation of the height regulating mechanism 10, and the slit 15 of the bag mouth holding plate 12 moves.
A and a pair of claws 21A, 2A projecting downward through 15B.
1B enters the inside of the opened bag mouth of the filling bag 5, and as the piston rods 23A, 23B extend in opposite directions by the operation of the claw driving cylinders 22A, 22B, a pair of claws 21A, 21B is a claw holding frame 24A,
24B so as to move away from each other along the slits 15A and 15B, respectively, and that the lower portion of the spring 2 has a shape corresponding to the shape of both end surfaces of the filling bag 5.
8A and 28B to rotate appropriately against the urging force of the
Pull both ends of the bag mouth in parallel. After that, when the movement of the claw holding frames 24A, 24B and the claws 21A, 21B is stopped, the claws 21A, 21B are held by the springs 28A, 28B in a state where both end surfaces of the bag mouth of the filling bag 5 are pulled in parallel. Then, the bag mouth of the filling bag 5 is reliably flattened in a straight line.

Next, in the bag upper holding mechanism 30 located below the height regulating mechanism 10 and the bag opening mechanism 20,
Rotating arm 4 by rotating operation of rotating cylinders 44
By the rotation of 1, 41, the holding plates 40, 40 arranged on both side ends of the holding frame body 31 rotate in the direction of the arrow from the position shown by the solid line to the position shown by the two-dot chain line in FIG. By the rotation of the holding plates 40, 40, the X-axis movable frames 32, 3
It reaches a position opposing the bag contact surfaces 33, 33 so as to hold both ends of the upper portion of the filling bag 5 located in front of the second bag contact surfaces 33, 33. Then, the holding cylinders 39, 3
As the Y-axis movable frames 38, 38 move rearward in the Y-axis direction due to the operation of 9, the respective holding plates 40, 40 also move rearward in the Y-axis direction. X-axis movable frame 3
2 and 32 are pressed against the bag contact surfaces 33 and 33,
0, 40 and the bag abutment surfaces 33, 33. Thereafter, X by the operation of the expansion cylinders 35, 35
With the movement of the axis movable frames 32, 32 in the X-axis direction in the direction in which they are separated from each other, the filling bag is held in a state where both ends of the filling bag are gripped between the holding plate 40 and the bag contact surface 33. X
The upper portion of the filling bag 5 and the bag mouth portion are further expanded in the axial direction to be further pulled in opposite directions, and are maintained in a straight, flat state. In this way, when the bag upper holding mechanism 30 expands and holds both upper end portions of the filling bag 5, the bag mouth holding plate 12 is raised in the Z-axis direction by the operation of the height regulating cylinder 11, and at the same time, the bag mouth holding plate 12 is raised. Presser plate 12
A pair of claws 21A of the bag lining mechanism 20 provided in
21B also rises and comes off the opening of the filling bag 5. At this time, the pair of claws 21A and 21B of the bag lining mechanism 20 cause the claw holding frames 24A and 24B to contract due to the contraction of the piston rods 23A and 23B due to the operation of the claw driving cylinders 22A and 22B.
Return to the standby state close to each other with B,
The upper ends of the claws 21A, 21B are stoppers 19A, 19B.
, Respectively, and is rotated against the biasing force of the springs 28A, 28B, and the lower ends of the claws 21A, 21B return to the inwardly inclined state.

Thereafter, the bag upper holding mechanism 30 which expands and holds both upper end portions of the filled bag is moved to the bag mouth sealing device 3 via the drive chain 51 by the operation of the drive motor 54 of the moving mechanism 50. . In the bag mouth sealing device 3, the bag mouth is sealed by sewing the bag mouth or tying the bag string while the upper end portions of the filling bag are held by the bag upper holding mechanism 30.

As described above, the sealing of the bag mouth of the filling bag is performed by regulating the bag mouth height, flattening the bag mouth, keeping the upper edge in a horizontal state, and securely securing both ends of the bag upper part. Since it can be performed while being expanded and held, it is possible to always reliably seal the bag mouth of the filling bag, and it is possible to eliminate a sealing error of the bag mouth.

After the closing of the bag mouth of the filling bag in the bag mouth sealing device 3 is completed, the bag upper holding mechanism 30 releases the holding of the filling bag and rotates the drive motor 54 of the moving mechanism 50 in reverse. As a result, the bag upper holding mechanism 30 is moved in the reverse direction and returns to the predetermined position.

[0041]

As described above, according to the present invention,
By using a pair of rotatable pawls that are spring-biased on the bag opening mechanism, the pair of pawls can be smoothly inserted into the bag opening of the filling bag filled with grains and the like in the filling machine. Further, it is rotated appropriately against the urging force of the spring so as to correspond to the shape of the both sides of the bag mouth of the filling bag, and pulls the both sides of the bag mouth of the filling bag in parallel. Since it can be maintained by the force, the upper portion of the bag mouth can be reliably flattened in a straight line.

Further, the bag mouth of the filling bag filled with grains or the like is pressed from above to regulate the height of the bag mouth, thereby leveling the upper edge of the bag mouth, and ensuring the bag mouth of the filling bag. After that, the upper end of the filling bag is held and both ends are further expanded, so that the height of the filling opening of the filling bag is regulated, the opening of the filling opening is flattened, and the upper portion of the filling bag is expanded reliably. Can be. In this manner, the bag can be fed into the bag-mouth sealing device while holding the bag whose height is regulated, the bag is flattened, and the upper part of the bag is expanded, and the sewing machine can be sewn or tied. In a bag mouth sealing device that seals the bag mouth by means of, for example, the bag mouth of the filling bag can be quickly and reliably sealed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a bag opening forming device for a filling bag of the present invention in relation to a filling machine and a bag opening sealing device.

FIG. 2 is a top view of a bag opening forming apparatus for a filling bag according to the present invention.

FIG. 3 is an overall perspective view of a height regulating mechanism and a bag closing mechanism.

FIG. 4 is a side view showing a part of the height regulating mechanism and the bag lining mechanism in a cutaway manner.

FIG. 5 is a perspective view showing a configuration of a part of a bag covering mechanism.

6 (a) and 6 (b) are schematic diagrams for explaining the action of the claws on the filling bag in the bag closing mechanism.

FIG. 7 is a perspective view of a bag upper holding mechanism in the bag opening forming apparatus of the present invention.

FIG. 8 is a top view of a bag upper holding mechanism in the bag opening forming apparatus of the present invention.

9 (a) is a partial cross-sectional view of the bag upper holding mechanism shown along the line AA in FIG. 8, and FIG. 9 (b) is a side view of the bag upper holding mechanism.

FIG. 10 is a perspective view showing a configuration of a Y-axis movable frame of the bag upper holding mechanism.

11A and 11B are a top view and a side view showing a moving mechanism of a bag upper holding mechanism.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 bag opening forming device 2 filling machine 3 bag opening sealing device 4 transfer device 5 filling bag 10 height regulating mechanism 11 height regulating cylinder 12 bag opening pressing plate 15A, 15B slit 16A, 16B guide shaft 17, 18 side wall 19A , 19B Stopper 20 Bag opening mechanism 21A, 21B Claw 22A, 22B Claw driving cylinder 24A, 24B Claw holding frame 26A, 26B Rotating shaft 27A, 27B Spring hooking part 28A, 28B Spring 30 Bag upper holding mechanism 31 Holding frame 32 X axis (first) movable frame 33 Bag contact surface 35 Expansion cylinder 38 Y axis (second) movable frame 39 Holding cylinder 40 Holding plate 41 Rotating arm 44 Rotating cylinder 50 Moving mechanism 51 Drive chain 54 Drive motor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seizou Kawashima 4290 Fujioka, Fujioka-cho, Shimotsuga-gun, Tochigi Prefecture Inside Tiger Kawashima Co., Ltd.

Claims (9)

[Claims] 1. A pair of claws are inserted into a bag mouth of a filling bag filled with grains and the like, and the pair of claws are moved so as to be separated from each other. In the flattening mechanism, the pair of claws are rotatably held by a pair of claw holding frames driven to approach and separate from each other, and are inserted into the bag mouth of the filling bag. A bag closing mechanism for a filling bag, wherein the portions are spring-biased in a direction away from each other. 2. A bag covering mechanism is mounted on a support plate driven in a vertical direction, and a pair of claws is disposed so as to protrude downward through an elongated slit formed in the support plate. A stopper provided on the support plate for rotating the claw portion projecting downward at a position where the claw approaches each other so as to further approach against the spring urging force.
A bag lining mechanism for the filling bag as described. 3. A height regulating mechanism provided with a bag mouth pressing plate for vertically pressing a bag mouth edge of the filling bag filled with grains and the like to regulate the height of the filling bag, and Each of the pair of claw holding frames mounted on the bag mouth holding plate and driven to approach and separate from each other is rotatably held, and through an elongated slit formed in the bag mouth holding plate. A portion that protrudes downward and is inserted into the bag mouth of the filling bag has a pair of claws spring-biased in a direction away from each other, and the pair of claws simultaneously with the height regulation of the filling bag by the bag mouth holding plate. And a bag opening mechanism configured to insert into the bag opening of the filling bag and to open the bag opening by moving the pair of claws away from each other. 4. A filling bag, which is attached below a bag covering mechanism, holds both upper end portions of the filling bag with two holding plates, and moves the two holding plates so as to be separated from each other. The apparatus according to claim 3, further comprising a bag upper holding mechanism configured to expand and hold the upper part. 5. The apparatus according to claim 4, further comprising a moving mechanism for moving the bag upper holding mechanism to the bag mouth sealing device. 6. A bag mouth holding plate of a height regulating mechanism is attached to a piston rod of a height regulating cylinder, and is configured to move in a vertical direction by operation of the height regulating cylinder. 6. A bag opening forming apparatus for a filling bag according to claim 3, wherein 7. A pair of claws of the bag opening mechanism are respectively rotated by a pair of claw holding frames respectively attached to tip ends of piston rods of two claw driving cylinders fixed on the bag opening holding plate. 7. The pair of pawls are held movably, and the pair of pawls are separated from or approach to each other by expansion and contraction of a piston rod by operation of each pawl driving cylinder. 3. The apparatus for forming a bag mouth of a filling bag according to claim 1. 8. A bag upper holding mechanism, which is disposed below the bag opening mechanism and is positioned along the conveying direction of the filling bag, and expansions fixed to both sides of the holding frame, respectively. It is provided so that it can be attached to the tip of the piston rod of the cylinder and move in the transport direction of the filling bag,
Two first movable frames each having a bag contact surface facing each other at both upper end portions of the filling bag, and filling by being attached to the tip of a piston rod of a holding cylinder fixed to the first movable frame. Two second movable frames housed in each of the two first movable frames so as to be movable in a direction orthogonal to the bag conveying direction, and the two second movable frames Two rotating arms respectively supported by and rotated by rotating cylinders fixed to the second movable frame, respectively;
Two holding plates respectively attached to the distal end of the rotating arm and rotating between a position facing the bag contact surface of the first movable frame and a side position of the holding frame; The two holding plates are rotated by the rotation drive of the rotary cylinder, and the upper end of the filling bag located in front of the bag contact surface is moved by the bag contact surface and the holding plate. Holding, and by operating the holding cylinder, the holding plate is moved together with the second movable frame to press and hold the upper end of the filled bag against the bag contact surface, and then the expansion cylinder is operated by operating the expansion cylinder. The first movable frame body is moved in a direction in which the first movable frame body is separated from each other in the conveying direction of the filling bag, and the holding plate and the bag contact surface for holding both upper end portions of the filling bag are moved so as to be separated from each other. To extend and hold the top of the bag Bag mouth forming device of the filling bag according to any one of claims 4 to 7, characterized in that the. 9. A moving mechanism for moving the bag upper holding mechanism to the bag mouth sealing device, comprising: a pair of sprockets spaced apart along a conveying direction of the filling bag; A drive chain attached to the holding frame of the bag upper holding mechanism, and a drive motor that can rotate forward and reverse to drive one of the pair of sprockets, and expands and holds the upper portion of the filling bag. 9. The apparatus according to claim 5, wherein the bag upper holding mechanism is moved.