JPH101109A - Packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging machine capable of transferring a sheetlike bag up to a bag opening position in such a manner that an opening of the bag is not opened. SOLUTION: A packaging machine 10 has a feed section 200 for feeding a bag 16 to a bag opening position A in a state that an opening of the bag 16 is directed upward and an opening unit 22 for opening the opening of the bag 16 fed so that leafy vegetables can be inserted into the bag 16 opened. The feed section 200 disposed below the bag opening position A and capable of containing the bags 16 in a stacked state has a stocker 14, whose width at its end where the opening side of each bag 16 is set is formed narrower than the width of the opening side of the bag 16, and a vertically movable unit 18 for the stocker 14. Further, the feed section 200 has a swinging arm 54 which is provided on a base 32 in a swingable manner so as to extend between the vicinity of the opening of each of the bags 16 contained in the stocker 14 and the adjacent position of the bag opening position A and which has a press bar provided at a top end of the arm 54. Furthermore, a pressure sensitive adhesive member for allowing the vicinity of the opening of the bag 16 to adhere is disposed at a position corresponding to a narrow portion of the stocker 14 on the underface of the press bar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine capable of reliably feeding a sheet bag to an opening device in order to efficiently pack an article to be packaged, such as leafy vegetables, in the sheet bag.

[0002]

2. Description of the Related Art Recently, leaf vegetables such as spinach and spring chrysanthemum are
They are stored in sheet-like bags and arranged at stores such as supermarkets. In many cases, spinach, spring chrysanthemum, and other leafy vegetables are simply bundled with tape or other materials and arranged in stores, but buyers dislike things that other buyers have touched, In many cases, packaging is gradually wrapped in bags for reasons such as damage to the leaf, or contact of the leafy vegetables with each other, and the rotting part is likely to be transferred to other products. Have been.
By the way, spherical vegetables such as cabbage and lettuce are relatively easy to handle, so various automatic packaging machines are widespread, but leaf vegetables are often indefinite in quantity and form. The fact is that they are stored in a bag.

[0003]

When the leaf vegetables are packaged by hand as described above, the difficult-to-handle leaf vegetables are wrapped around the sheet and held in one hand, and the opening of the sheet bag is opened with the other hand. After that, the leafy vegetables must be pushed into the bag together with the sheet-like material from the root, and the leaf-like material must be pulled out and stored in the sheet-like bag, resulting in poor workability. There is.

[0004] The applicant of the present invention has proposed a packaging machine capable of efficiently packaging objects to be packaged, such as leafy vegetables, which are difficult to handle, as shown in JP-A-8-40413. The outline of the packaging machine 10 will be described with reference to FIGS. Reference numeral 200 denotes a bag supply unit that supplies the sheet-like bags 16.
Is supplied from the stocker 14 of the stocker unit 12 to the opening position A with the opening 16a facing upward.
The outer shape of the sheet-like bag 16 is substantially trapezoidal as shown in FIG. 22, for example. Reference numeral 22 denotes an opening device, which is an opening 1 of the sheet-like bag 16 supplied to the opening position A.
It has the function of opening 6a. Reference numeral 26 denotes an insertion tube vertical movement device, which has a function of inserting the insertion tube 24 into the sheet bag 16 from above the opening 16a of the opened sheet bag 16. The insertion tube 24 is processed so that the inner surface is slippery so that leaf vegetables and the like can be easily inserted. As a result, the sheet-like bag 16 is automatically supplied, the opening 16a thereof is opened, and the insertion tube 24 whose inner surface is made slippery is inserted into the sheet-like bag 16, so that the operator can easily remove the leaves. Vegetables and the like can be inserted deep into the sheet-like bag 16.

As shown in FIG. 19, the supply unit 200 of the packaging machine 10 is disposed below the opening position A so as to be movable up and down, and is a stocker capable of stacking a large number of sheet-like bags 16 and storing a large number of sheets. 14, a vertical movement device 18 for vertically moving the stocker 14 (which constitutes a stocker section 20 together with the stocker 14), and a position near the opening of the sheet-like bag 16 stored in the stocker 14 and a position close to the opening position A. A swivel arm 54 pivotally provided on the base 32 with a press bar 56 at the tip, and a pivot arm 54 provided on the lower surface of the press bar 56 so that when the stocker 14 is raised, the opening of the sheet-like bag 16 An adhesive member 57 that sticks the vicinity of the portion 16a with an interval between the tip of the opening 16a and a pressing bar 56,
The pivot arm 54 is attached so as to be movable along the longitudinal direction, and when it is lowered by its own weight, the lower end edge thereof is
And a weight plate 59 protruding downward from the lower surface of the sheet bag and bending the tip of the opening 16a of the adhered sheet-like bag 16 downward with the adhesive portion as a base point. Here, the reason why the tip of the opening of the adhered sheet bag 16 is bent downward is as follows.
The sheet-like bags 16 are adhered one by one to the tip of the revolving arm 54, and when the sheet-like bags 16 are conveyed in an arc from the stocker 14 to the opening position A, the opening 16 of the sheet-like bags 16
This is to prevent air from entering from opening a to open opening 16a. Because the opening 16a is open, the edge of the opening 16a of the other bag surface hangs down because the sheet-like bag 16 has only one bag surface adhered and held. Therefore, the opening operation by the opening device 22, that is, the opening 16a of the sheet-like bag 16 is sandwiched,
This is because the operation of adhering and opening both bag surfaces cannot be performed normally.

However, since the sheet-like bags 16 are manufactured by fusing the ends in the width direction of both bag surfaces, when they are laminated on the stocker 14, the sheet-like bags 16 have the width-direction end sides. (Seal position by fusing) is thicker than the central part as shown in FIG. 21, and when many sheets are stacked on the inner bottom surface of the stocker 14 formed in a plane, the sheet-like bag 16 located at the upper part has an arc shape. Bend. This warping is not completely eliminated by the pressing by the pressing bar 56 and the weight plate 59, and the warping direction is determined by the opening 16 by the weight plate 59.
Since it is in the direction that hinders the downward bending of a,
The bending of the opening 16a by the weight plate 59 may be insufficient. In this case, since the opening 16a faces in the conveying direction during the conveyance to the opening position A, the air can easily enter through the opening 16a and the possibility of opening increases. For this reason, there arises a problem that the opening operation of the opening 16a by the opening device 22 cannot be performed normally.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a packaging machine capable of transporting a sheet-like bag to an opening position so that the opening is not opened. It is in.

[0008]

The present invention has the following arrangement to achieve the above object. That is, the first packaging machine includes a bag supply unit that supplies the sheet-shaped bag to the opening position with the opening facing upward, and an opening device that opens the opening of the sheet-shaped bag supplied to the opening position. In a packaging machine comprising a packaged object such as leafy vegetables which can be inserted from the opened opening, the supply section of the bag is disposed below the opening position, and the sheet-like bag is provided. A stacker that can store a large number of sheets in a stack and the width of the end on which the opening side of the sheet-shaped bag is placed is formed narrower than the width of the opening side of the sheet-shaped bag. It is provided on the base so as to be able to move up and down, and to be pivotable, so that it can move between the vicinity of the opening of the sheet-like bag stored in the stocker and the position close to the opening position. A pivot arm having a pressing bar at the tip, And a pressure-sensitive adhesive member provided on a lower surface of the sheeter at a position corresponding to the narrow portion of the stocker, the pressure-sensitive adhesive member adhering near the opening of the sheet-shaped bag when the swing arm is moved down. And With this configuration, both ends near the opening of the sheet-like bag pressed by the pressing bar protrude from the stocker and hang down. As described above, since both end portions that become thick when a plurality of sheets are stacked hang down, and only the central portion having substantially the same thickness is placed on the stocker, the sheet-like bag can be adhered without slack. The second packaging machine may further include a bag supply unit that supplies the sheet-shaped bag to the opening position with the opening facing upward, and an opening device that opens the opening of the sheet-shaped bag supplied to the opening position. In the packaging machine, which is capable of inserting a packaged object such as leafy vegetables through the opened opening, the supply section of the bag is disposed below the opening position so as to be vertically movable. A large number of sheets can be stored by stacking the sheet-like bags,
The width of the end portion on which the opening side of the sheet-shaped bag is placed is a stocker formed narrower than the width of the opening side of the sheet-shaped bag, a vertical movement device for vertically moving the stocker, and the stocker. A swivel arm provided on the base so as to be pivotable between a position near the opening of the stored sheet-like bag and a position close to the opening position, and a pivot arm having a pressing bar at the tip; and a lower surface of the pressing bar. , Provided at a portion corresponding to the narrow portion of the stocker, when the stocker is raised,
And an adhesive member for adhering near the opening of the sheet-shaped bag. With this configuration, both ends near the opening of the sheet-like bag pressed by the pressing bar protrude from the stocker and hang down. As described above, since both end portions that become thick when a plurality of sheets are stacked hang down, and only the central portion having substantially the same thickness is placed on the stocker, the sheet-like bag can be adhered without slack.

The pressure-sensitive adhesive member is provided at a position where the vicinity of the opening of the sheet-like bag and the front end of the opening are adhered with a space between the opening and the tip of the opening. The lower end edge protrudes downward from the lower surface of the pressing bar when it is lowered by its own weight, and the weight plate that bends the tip of the opening portion of the adhered sheet-shaped bag downward is provided. If it is provided, the both ends near the opening of the sheet-shaped bag placed on the stocker hang down from the stocker, and when transported by the swivel arm, the tip of the opening of the sheet-shaped bag is surely lowered. Can be folded. Therefore, it is possible to prevent the opening portion from being opened during the conveyance and the opening operation of the sheet-like bag by the opening device from failing.

The sheet-like bag is disposed above the front end of the opening so as to be along the front end of the opening, and is provided so as to be vertically movable with respect to the stocker. When the lower surface of the pressing bar contacts the sheet-shaped bag, it presses the leading end of the opening of the sheet-shaped bag, and when the stocker moves downward by a predetermined distance from the contact position, the pressing of the sheet-shaped bag is released. If the sheet-like bag is provided with a pressing plate, the sheet-like bag is pulled up from the stocker while pressing the tip of the opening, and more reliable bending can be performed based on the adhesive position.

The press plate is specifically provided on a wall surface of the stocker on the opening side of the sheet-like bag so as to be vertically slidable with respect to the stocker. A stopper attached to the base is disposed, and the holding plate presses the opening end of the sheet-like bag stacked on the stocker by its own weight when the stocker is lifted, and the stocker is pressed by a predetermined amount. It is preferable that, when the sheet is moved downward, the stopper comes into contact with the stopper so that the downward movement is restricted and the pressing of the sheet-shaped bag is released.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a packaging machine according to the present invention will be described below in detail with reference to the accompanying drawings. First, the overall outline and functions of the packaging machine 10 will be described.
The basic configuration is almost the same as the conventional example described with reference to FIGS. 19 and 20, the same components are denoted by the same reference numerals, and detailed description is omitted. A large number of sheet-like bags (hereinafter, also simply referred to as “bags”) 16 are stored in the stocker 14 of the stocker section 12 in a stacked state. The stocker 14 is provided to be vertically movable by a vertical movement device (also referred to as a stocker vertical movement device) 18. The transfer / revolving arm unit 20 holds the bags 16 housed in the stocker 14 one by one with an adhesive member around the opening and in the vicinity of the opening, and from the horizontal position in the figure to the vertical position, the opening 16a of the bag 16 It is conveyed so that the rim reaches the opening device 22. that's all,
A supply unit 200 is configured by the stocker unit 12, the stocker vertical movement device 18, and the transfer / rotation arm unit 20.

In the opening device 22, the opening 16a of the bag 16 is opened. The insertion tube (insertion guide) 24 is inserted into the opened bag 16 by the insertion tube vertical movement device 26. In this state, the operator inserts the leafy vegetables into the insertion tube 24. A pressing device 28 presses the leaf vegetables inserted into the bag 16 through the insertion tube 24 from both sides of the bag 16. In this state, the insertion tube 24 is raised above the bag 16. Then, by releasing the holding of the bag 16 by the holding member by the opening device 22, the bag 16 in which the leafy vegetables are inserted is released.
Falls and is taken out by the shooter 30. Each device constituting the above-described packaging machine 10 includes a camshaft 4 rotated by the same drive source (not shown) as described later.
9, the cam 50 driven by the cam shaft 49, the cam arms 46 and 102, the set bar 120, and the like to operate in conjunction. Each device is provided with a drive source such as an electric motor,
Each device may be operated in conjunction with each other by the central control device. In the present embodiment, after the opening of the bag 16 is automatically opened, the leaf vegetables are manually
Although it is inserted into the inside, it is good also as a structure which performs this input automatically instead of the manual input of leafy vegetables.

Next, details of each part will be described. First, according to FIGS. 1 to 3, the stocker unit 12 and the stocker vertical movement device 1 will be described.
8 will be described. Reference numeral 31 denotes a vertically moving frame, and a base 32
Is provided so as to be vertically movable while being guided by a guide pin 33 provided in the first position. The vertically moving frame 31 is urged upward by a coil spring 34. Vertical frame 31
A slide shaft 39 is horizontally supported on the upper surface of the, and a movable plate 41 is movably supported on the slide shaft 39 via a bearing 40. The movable plate 41 is always pulled to the left in FIG. The stocker 14 is detachably mounted on the moving plate 41.

The stocker 14 has a bag 16 as shown in FIG.
The bag 16 is formed in a box having an outer shape that can be stored according to the outer dimensions of the bag. In the present embodiment, the bag 16 is
Since the opening 16a side is formed in a trapezoid having a long side as shown in FIG. 7, the stocker 14 is also formed in a trapezoid in accordance with the trapezoid. Also, both corners on the long side of the stocker 14 are cut off diagonally in a tapered shape gradually narrowing toward the long side. Thus, the stocker 14
By cutting off both corners on the long side, both ends of the laminated bag 16 having an increased thickness from the central portion on the opening 16a side protrude from the stocker 14 and hang downward by gravity as shown in FIG. For this reason, the lower surface of the pressing bar 56 is placed on the narrow portion 202 of the stocker 14 (the long side that is cut and narrow at both ends as described above) 202 to have a substantially uniform thickness. It contacts only the central part of the bag 16. The stocker 14 has an elastic sheet 42 on the inner bottom surface.
, The pressing force of the pressing bar 56 on the bag 16 can be set to an appropriate magnitude.

Reference numeral 43 denotes a guide plate extending from the base 32. On the upper surface, an inclined surface 43a which is inclined rightward and downward in FIG. 1 is formed. A roller 44 provided below the bearing 40 contacts the inclined surface 43a. Reference numeral 46 denotes a cam arm, which is attached to a shaft 47, and a cam follower 48 provided at one end thereof is in contact with a cam 50 attached to a common cam shaft 49. A rod 51 is connected to the other end of the cam arm 46, and the other end of the rod 51 is connected to the vertically moving frame 31. The cam arm 4 by the cam 50
6 is rotated, the vertical movement frame 31 is moved by the rod 51.
Moves downward against the urging force of the coil spring 34 and the spring 38. At this time, since the rollers 44 come into contact with the inclined surface 43a, the stocker 14 moves downward by a predetermined distance, and then moves downward obliquely to the right against the urging force of the spring 38. When the tension from the rod 51 is released, the vertically movable frame 31 is raised by the coil spring 34. At this time, the stocker 14 is regulated by the inclined surface 43a by the tensile force of the spring 38 (stocker 1).
4 and the like are in contact with the inclined surface 43a under their own weight) and rise diagonally to the upper left. That is, the stocker 14 moves up and down and moves in the length direction of the bag 16.

Next, referring to FIG. 4, FIG. 5, and FIG. 20, the transport / swivel arm 20 (which constitutes a part of the supply unit 200).
Will be described in detail. The swing arm 54 is disposed above the stocker 14, and around a shaft 55,
The tip is pivotally provided between a vertical position facing the upper surface of the stocker 14 and a horizontal position facing directly below the opening device 22. The turning arm 54 is driven in conjunction with the vertical movement of the stocker 14 by a turning drive mechanism including a cam arm, a rod, and the like (not shown) that is operated by the rotation force of the cam shaft 49. A pressing bar 56 is fixed to the tip of the turning arm 54 in the horizontal direction. A sheet-like second adhesive member 57 is attached to two positions of the pressing bar 56. As the second adhesive member 57, various materials such as double-sided tape can be used in addition to low-hardness urethane containing a plasticizer. The sticking position of the second adhesive member 57 is a position corresponding to the vicinity of both ends in the width direction of the narrow portion 202 of the stocker 14 as shown in FIG. 3 (B in FIG. 2 indicates the second adhesive member 57). And the bag 16 are shown in contact with each other). The pressing area C of the bag 16 by the pressing bar 56 is near the opening 16a of the bag 16 placed on the narrow portion 202 as is clear from FIG. The position where an interval for generating D is opened is set.

Reference numeral 59 denotes a weight plate (weight member), which is provided on the front surface of the pressing bar 56 so as to be vertically movable. That is, the weight plate 59 is provided with a long hole (not shown), and the headed pin 60 fixed to the pressing bar 56 is inserted into the long hole so that the weight plate 59 can move up and down in the range of the long hole. Has become. 61 is a weight. When the swing arm 54 is at a position perpendicular to the stocker 14, the weight plate 59 is lowered by its own weight, and the lower edge of the weight plate 59 is located below the second adhesive member 57. That is, the second
Before the bag 16 is adhered by the adhesive member 57, the upper surface of the bag 16 is pressed by the weight plate 59. This is because, in the vicinity of the opening 16 of the bags 16 stored in a stacked state in the stocker 14, only the central portion is placed in the narrow portion 202 of the stocker 14, and both ends hang down from the stocker 14. The portion pressed by the pressing bar 56 is flatter than in the case of the example, but this is for more surely flattening.

The weight plate 59 is connected to the opening 16a of the bag 16.
It also has a function of bending the bending margin D at the tip downward. In the present embodiment, the pressing area C of the bag 16 and the bending allowance D by the pressing bar 56 are located on the narrow portion 202 of the stocker 14. As shown in FIG. 3, the bag 16 in this portion is in the opposite direction to the conventional example, that is, the opening 1 of the bag 16
The both ends on the 6a side are warped so as to be located lower than the center part. Therefore, the direction of the warp of the bag 16 is
9, the bending direction is the same as the bending direction of the bending margin D, so that the bending margin D can be reliably bent by the weight plate 59.

In FIG. 20, reference numeral 73 denotes a weight plate 59.
And a regulating spring stretched between the rotating shafts of the gear 64. When the swing arm 54 is in the vertical position with respect to the stocker 14, it is in a relaxed state, and the weight plate 59 is allowed to descend by its own weight. When the swing arm 54 is rotated to the horizontal state, it is tensed, pulls the weight plate 59, and the tip of the weight plate 59 is moved to a position where it is retracted from the tip of the pressing bar 56. Therefore, the rotating shaft 64a of the gear 64
The position is deviated toward the stocker 14 side. With this structure, when the bag 16 is transported to the opening position A, the bending operation of the bending margin D by the weight plate 59 is released.

Referring to FIG. 4, FIG. 5, and FIG. 20, the state of adhesive conveyance of the bag 16 by the revolving arm 54 will be described. FIG.
At zero, the pivot arm 54 is in a position perpendicular to the stocker 14. In this state, the stocker 14 is raised by the action of the stocker vertical movement device 18, and the uppermost bag 16 in the stocker 14 is moved together with the stocker 14 by the action of the spring 34.
Pressed against. At this time, the weight plate 59 comes into contact with the bag 16 before the pressing bar 56, and the bag 16 is made flatter. Thereby, the second bar attached to the distal end surface of the pressing bar 56 is
Both ends of the bag 16 are adhered to the adhesive member 57 (FIG. 4).

Next, as described above, the vertical movement frame 31, and thus the stocker 14, is moved downward by the action of the cam 50, and moves diagonally downward and rightward in FIG. Therefore, as shown in FIG. 5, the opening end side of the bag 16 is lifted from the lower layer bag 16, air enters between the two, and the bag 16 is well separated.
At the same time, the weight plate 59 is lowered by its own weight, and its tip protrudes downward from the lower surface of the pressing bar 56, so that the bending margin D of the bag 16 is bent downward with the adhesive portion as a base point. At this stage, the swivel arm 54 is rotated to the horizontal position by the swivel drive mechanism, and at the same time, the weight plate 59 is also retracted, and the bag 16 is conveyed below the opening device 22 with the opening 16a facing upward (FIG. 20). . The folding allowance D of the bag 16 in which the folding operation by the weight plate 59 is released at the opening position A is the bag 1
6 extends upward due to the surface rigidity of 6. If the weight plate 59 is not provided, the bag 16 is not flat when the both ends of the bag 16 are adhered by the second adhesive member 57.
There is a risk that the bag between the adhesive members 57 will be slack, and it will be difficult for a later-described clamp claw to enter the opening of the bag 16. If the bending allowance D cannot be sufficiently bent by the weight plate 59, the turning arm 54 turns from the vertical position to the horizontal position, and when the bag 16 is transported to the opening position A, the leading end in the turning direction is turned. There is a possibility that air may hit the tip of the opening 16a located at the position, and the mouth may open, so that the clamp claw may also be difficult to enter the opening of the bag 16.

FIGS. 6 and 7 show another embodiment of the stocker 14. In this embodiment, the opening 16 of the bag 16 is
Above the tip a (specifically, above the bending margin D), the stocker 14 is provided with a holding plate 204 that is disposed along the bending margin D and that can move up and down with respect to the stocker 14. The holding plate 204 is used for the stocker 14.
Moves upward, and when the lower surface of the pressing bar 56 contacts the bag 16, the pressing bar 56 presses the bending allowance D of the bag 16. Then, after the stocker 14 has moved downward by a predetermined distance, it has a function of releasing the pressing of the bag 16.

An example of a specific structure of the holding plate 204 will be described with reference to FIGS. Narrow part 2 of stocker 14
02, the wall surface 20 erected from the mounting surface of the bag 16
In FIG. 6, two guide grooves 208 are formed along the vertical direction at predetermined intervals, for example. The holding plate 204 is formed in a long plate body, and its width is formed to be slightly smaller than the bending allowance D so as not to interfere with the pressing bar 56. Further, one of the side surfaces parallel to the longitudinal direction is formed. In other words, two guide portions 210 each having a leading end formed to have a width larger than the width of the guide groove 208 and an intermediate portion having a width capable of being inserted into the guide groove 208 are provided at the same distance from the guide groove 208 so as to protrude. Have been. Then, the holding plate 204 is mounted on the wall surface 206 of the stocker 14, and the guide portion 210 is mounted on the guide groove 208, and is mounted movably in the vertical direction above the bending margin D of the bag 16.

In the present embodiment, the holding plate 204
Is formed to be longer than the width of the stocker 14, and stoppers are provided at positions near both ends protruding from the stocker 14 so as not to interfere with the stocker 14 which moves up and down as shown in FIG. 212 is attached to the base. The installation height of the stopper is set slightly higher than the lowest position of the vertical movement range of the stocker 14. Therefore, before the stocker 14 reaches the lowermost position, the stocker 14 comes into contact with the lower surface of the holding plate 204 to stop the lowering of the holding plate 204, and thereafter, the stocker 14 moves slightly further downward.
There will be a gap between the bag 16 and the bag 16 stacked thereon. The installation height is set in consideration of the length of the guide groove 208, and even if the stocker 14 is lowered to the lowest position after the holding plate 204 is restricted from lowering by the stopper, the guide portion 210 is moved from the guide groove 208 to the guide portion 210. Is set so that it does not come off. In the present embodiment, the holding plate 204 has a structure provided on the stocker 14.
Alternatively, a guide frame (not shown) that supports the holding plate 204 slidably in the vertical direction may be provided on the base.

Next, referring to FIG. 8 to FIG.
The adhesive conveyance operation of the bag 16 by the revolving arm 54 in the case where 4 is provided will be described. First, as shown in FIG. 8, the stocker 14 is raised from the lowest position to the highest position. At the highest position, the uppermost bag 1 in the stocker 14
6 is pressed against the pressing bar 56. Also, holding plate 2
While the stocker 14 is being lifted, the stocker 04 comes into contact with the bag 16, separates from the stopper 212, and rises together with the stocker 14. The holding plate 204 is provided with a stopper 212
After separating from the bag 16, the bending margin D of the stacked bags 16 is pressed by its own weight. Subsequently, the stocker 14 moves downward in FIG.
The bag 16 adhered to the bag 16 is a bag 16 whose opening end side is a lower layer.
From the air, and air enters between the two. Pressing bar 5
6, the pressing of the bag 16 is released, and
9 falls by its own weight, and its tip protrudes downward from the lower surface of the pressing bar 56. Therefore, the bending margin D of the bag 16 is bent downward from the adhesive portion as a base point.

At this time, the bag 16 to be lifted is bent.
The stock D moves the holding plate 204 in accordance with the downward movement of the stocker 14.
From, the tension between the adhesive part and the holding plate 204
It is gradually pulled out while being treated in the state. So sticky
The downward bending angle θ of the bending allowance D based on the part is
It gradually increases as shown in FIGS. 9 to 10 (θ₁<
θ _Two). For this reason, the bending by only the weight plate 59 described above.
Compared to the operation, the downward bending of the bending allowance D is surely performed.
I can get it. In the case of bending operation by the weight plate 59,
In addition, as described above, the bending allowance D is
Because it is pulled out in a stretched state, it is flat even after being pulled out
Holding. Therefore, the bending allowance D is equal to the weight plate 59.
Thereby, it can be uniformly bent as a whole.

Subsequently, when the stocker 14 moves further downward as shown in FIG. 11, the turning arm 54 starts rotating. Due to the lowering movement of the stocker 14 and the rotation of the swivel arm 54, the bent margin D of the adhered bag 16 is reduced by the pressing plate 2.
04, the bag 16 is transported toward the opening position A. Then, as shown in FIG. 12, the stocker 14 further moves downward from the uppermost position by a predetermined distance. When the stocker 14 reaches a position near the lowermost position, both ends of the holding plate 204 that has been moved down with the stocker 14 The contact makes the downward movement of the holding plate 204 restricted, and
Further, a gap is opened between the bag 16 placed on the stocker 14 that moves down to the lowest position. Thereby, the opening 16a of the bag 16 in the stocker 14 by the holding plate 204
The holding down on the side is released. The reason that the pressing of the bag 16 by the pressing plate 204 on the opening 16a side is temporarily released until the next movement of the stocker 14 means that the bag 16 transported by the revolving arm 54 is pressed by the pressing plate 204. When the bag 16 is pulled out from the holding plate 204 while being pressed, the opening 16a of the bag 16 in the lower layer of the bag 16 may also move in the drawing direction and shift. Here, once the pressing by the holding plate 204 is released, the bag 16
Has a certain surface rigidity, so that the shifted opening 16a
The side extends toward the wall surface 206 and can return to a planar state.

Next, the schematic structure of an example of the opening device 22 will be described with reference to FIGS. The bag 16 adhered by the transport / swivel arm unit 20 has an opening 16a.
Is supplied until the opening 16a is positioned immediately forward of the first pressing member 80 with the upper side facing upward. At that time, the swing arm 5
4 is located immediately below the first pressing member 80. A sheet-like first adhesive member 104 and a first adhesive member 105 similar to the second adhesive member 57 are attached near both ends of the opposing surfaces of the first pressing member 80 and the second pressing member 81, respectively. I have. The adhesion position of the second adhesive member 57 was near the both side edges of the bag 16 and was a position where the portion slightly inside from the tip of the opening was adhered. The position where the first adhesive member 105 is attached is a portion which is considerably inside from both side edges of the bag 16, and is located between the opening edge of the bag 16 and the position where the second adhesive member 57 is attached. It is set so as to adhere to a site (a site closer to the opening end).

Next, a clamp device (an example of a holding means and a holding member) will be described. A pair of clamp claws 106 and a pair of clamp claws 107 are provided on the first pressing member 80 and the second pressing member 81, respectively. Clamp claw 106 is the first
Similarly, at a position slightly inside the width direction of the bag 16 with respect to the adhesive member 104 of FIG.
Is provided at a position slightly inside the adhesive member 105. Each of the clamp claws 106 and 107 has a substantially L-shaped side shape, and is provided on each of the first pressing member 80 and the second pressing member 81 at an intermediate portion thereof so as to be rotatable around the shafts 108 and 109. Is being worn. Each of the clamp claws 106 and 107
As a result, the edge of the opening 16a of the bag 16 is held. Further, a pressing piece 1 described later is provided at the rear end of each of the clamp claws 106 and 107.
Bearings 115 and 116 that come into contact with 26 and 127 are attached. In addition, each clamp claw 106, 107
Is a spring (not shown), and the front claw portion is always provided with each pressing member 8.
It is urged to abut the opposing surfaces 0 and 81. The first and second pressing members are brought into contact with a cam (not shown) provided on the cam shaft 49 and swinging around a shaft 101 by a cam arm 102 and a rod 93 connected to the other end of the cam arm 102. 80, 81 contact / separation devices are configured. Reference numeral 126 denotes a pressing piece provided on the movable base 89, and reference numeral 127 denotes a pressing piece fixed to the base.

Next, the opening operation of the bag 16 by the opening device 22 will be described. As described above, the bag 16 is conveyed by the conveying / rotating arm unit 20 with the opening 16a facing upward so that the tip of the opening is located near the first pressing member 80 (FIGS. 13, 19, and 20). ). Clamp claw 106
Is closed, and the open end of the bag 16 is located immediately before the clamp claw 106. Here, the moving base 89 starts to move in the direction of the base 82 to which the first pressing member 80 is attached, and during the movement of the moving base 89, the clamp pawl 106 comes into contact with the pressing piece 126.
07 comes into contact with the pressing piece 127 and starts to open (FIG. 14).
Further movement of the moving base 89 causes the first pressing member 80 and the second pressing member 81 to be in a close pressing state, so that the first adhesive members 104 and 105
(FIGS. 15 and 17).

Next, the moving base 89 moves in a direction away from the base 82. Thereby, the open end of the bag 16 is slightly opened. During the movement of the moving base 89, the pressing piece 12
The pressing of the clamp claws 106 and 107 by the press members 6 and 127 is released, and the clamp claws 106 and 107 rotate, enter the open end of the bag 16 whose tip claw portion is slightly opened, and are completely closed. Between the front claw portion and the opposing surfaces of the first pressing member 80 and the second pressing member 81.
6, the two sheet portions at the open end are sandwiched. The clamping positions of the clamp claws 106 and 107 are slightly inside the adhesion positions of the first adhesive members 104 and 105 (the same state as in FIG. 14).

When the moving base 89 moves further, the second
The adhesive in the vicinity of both ends of the bag 16 by the adhesive member 57 is removed, and the bag 16 by the first adhesive members 104 and 105 is removed.
Is also removed. In other words, the bag 16 is kept from the adhesive holding by the second adhesive members 57, 104,
06, 107 will be completely handed over. When the moving base 89 moves a predetermined distance, the bag 1
The opening 6 is completely opened up to the portion clamped by the clamp claws 106 and 107 (FIG. 18). The reset bars 120 and 121 are pulled downward after the storage of the articles to be packed in the bag 16 is completed, whereby the holding of the bag 16 by the clamp claws 106 and 107 is released, and the bag 16 falls into the shooter 30. . Note that the opening device is not limited to the above configuration, and for example, a bag 16
Various modifications are possible, such as a configuration in which the bag opening is opened by adsorbing the air using a vacuum nozzle.

In the above embodiment, the swing arm 54 is pivotally mounted on the base, and the stocker 14 is moved toward and away from the swing arm 54 by the stocker vertical movement device 18. The configuration, that is, the configuration in which the stocker 14 is attached to the base and the swivel arm 54 is provided on the base so as to be able to move up and down above the stocker 14 and to be able to swivel.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to these embodiments, and it is possible to make various modifications without departing from the spirit of the invention. Of course.

[0036]

According to the packaging machine of the present invention, both ends near the opening of the sheet bag pressed by the pressing bar are
It protrudes from the stocker and hangs down. As described above, since both end portions that become thick when a plurality of sheets are stacked hang down, and only the central portion having substantially the same thickness is placed on the stocker, the sheet-like bag can be adhered without slack. Also, the pressing bar is movably attached along the longitudinal direction of the swivel arm, and when lowered by its own weight, the lower edge protrudes downward from the lower surface of the pressing bar, and the tip of the opening of the adhered sheet-like bag is attached. When the weight plate that bends downward is provided, the both ends near the opening of the sheet-like bag placed on the stocker hang down from the stocker, and the opening of the sheet-like bag is conveyed by the rotating arm. The tip can be reliably bent downward. Therefore, it is possible to prevent the opening portion from being opened during the conveyance and the opening operation of the sheet-like bag by the opening device from failing. Further, since the bag can be reliably bent, the opening does not open even if the transport speed of the bag by the revolving arm is further increased, so that the entire packaging operation of the packaging machine can be speeded up. In addition, above the front end of the opening of the sheet-shaped bag, along with the front end of the opening, it is provided so as to be able to move up and down with respect to the stocker, the stocker moves upward, and the lower surface of the pressing bar is shaped like a sheet. When the tip of the opening of the sheet-shaped bag is pressed when it comes into contact with the bag, and when the stocker moves downward by a predetermined distance, a holding plate that releases the pressing of the sheet-shaped bag is provided. Since it is lifted up from the stocker while holding down the tip of the portion, there is a remarkable effect that it is possible to make a more reliable bending based on the adhesive position.

[Brief description of the drawings]

FIG. 1 is a mechanism diagram of a stocker section of a packaging machine.

FIG. 2 is a plan view showing the shape of the stocker according to the present invention.

FIG. 3 is a front view of a state in which the bags are stacked on the stocker of FIG. 2 as viewed from the opening direction of the bags.

FIG. 4 is an explanatory view showing a state in which a pressing bar of a swing arm is in contact with a bag.

FIG. 5 is an explanatory view showing a separated state of the uppermost bag and the lower bag.

FIG. 6 is a plan view showing the structure of another embodiment of the stocker.

FIG. 7 is a front view showing a connection structure between the stocker and the holding plate of FIG. 6;

FIG. 8 is an explanatory view showing an adhesive conveyance operation of a bag when the stocker of FIG. 6 is used (a state in which a pressing bar is in contact with a sheet bag).

FIG. 9 is an explanatory diagram of a state where the stocker has slightly moved down from the state of FIG. 8;

FIG. 10 is an explanatory diagram of a state where the stocker is further moved down slightly from the state of FIG. 9;

FIG. 11 is an explanatory diagram of a state in which the turning arm starts rotating from the state of FIG. 10;

FIG. 12 is an explanatory view showing a state in which the stocker further moves down from the state of FIG. 11, and the pressing plate comes into contact with the stopper to create a gap between the stopper and the bag.

FIG. 13 is an explanatory diagram of a closed state of a clamp claw.

FIG. 14 is an explanatory diagram of a halfway stage in which the moving base approaches the base direction.

FIG. 15 is an explanatory diagram of a state where the clamp claw is pushed by the pressing piece and is opened.

FIG. 16 is a view showing a state where the clamp claw is opened by the reset bar,
It is explanatory drawing of the state which drops a bag.

FIG. 17 is a plan view showing a state where the first pressing member and the second pressing member are close to each other.

FIG. 18 is a plan view showing a state where the opening of the bag is opened to the maximum.

FIG. 19 is a schematic view of the entire packaging machine.

FIG. 20 is a mechanism diagram of a transfer / rotation arm unit.

FIG. 21 is an explanatory view of a state of storing a bag in a conventional stocker.

FIG. 22 is an explanatory diagram of a bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Packaging machine 12 Stocker part 14 Stocker 16 bag 16a Opening part of bag 18 Stocker vertical movement device 20 Conveying / rotating arm part (supply part) 22 Opening device 24 Insertion cylinder (insertion guide) 26 Insertion cylinder vertical movement device 32 Base 54 Swivel arm 56 Press bar 57 Second adhesive member 59 Weight plate (weight member) 200 Supply unit 202 Narrow portion

Claims (5)

[Claims] 1. A bag supply unit for supplying a sheet-like bag to an opening position with an opening facing upward, and an opening device for opening the opening of the sheet-like bag supplied to the opening position. In a packaging machine capable of inserting an article to be packaged such as leafy vegetables through the opened opening, the bag supply section is disposed below the opening position, and a large number of the sheet-shaped bags are stacked. And a width of an end portion on which the opening side of the sheet-shaped bag is placed is formed to be narrower than a width of the opening side of the sheet-shaped bag, and a position above the stocker. And provided on the base so as to be vertically movable and pivotable, and movable between a position near the opening of the sheet-like bag stored in the stocker and a position near the opening position. A swing arm having a pressing bar, and a lower surface of the pressing bar. A packing member provided at a portion corresponding to the narrow portion of the stocker, and sticking around the opening of the sheet-shaped bag when the swing arm is moved down. . 2. A bag supply unit for supplying a sheet-like bag to an opening position with an opening facing upward, and an opening device for opening the opening of the sheet-like bag supplied to the opening position. In a packaging machine in which an article to be packaged such as leafy vegetables can be inserted from the opened opening, the supply section for the bag is disposed below the opening position so as to be vertically movable,
A stacker in which a large number of the sheet-shaped bags can be stacked and stored, and the width of the end on which the opening of the sheet-shaped bag is placed is smaller than the width of the opening of the sheet-shaped bag. A vertical movement device for vertically moving the stocker; and a pivotally provided on the base between a position near the opening of the sheet-shaped bag stored in the stocker and a position close to the opening position, A swivel arm having a pressing bar at the tip, provided on a lower surface of the pressing bar, at a position corresponding to the narrow portion of the stocker, and when the stocker is raised, adheres to the vicinity of an opening of the sheet-like bag. And a pressure-sensitive adhesive member. 3. The pressure-sensitive adhesive member is provided at a portion where the vicinity of the opening of the sheet-like bag and the front end of the opening are adhered with a space between the opening and the tip of the opening. The lower end edge protrudes downward from the lower surface of the pressing bar when it is lowered by its own weight, and the weight plate that bends the tip of the opening portion of the adhered sheet-shaped bag downward is provided. The packaging machine according to claim 1, further comprising: 4. An upper portion of the sheet-like bag is provided above the front end of the opening so as to be along the front end of the opening, and is provided so as to be vertically movable with respect to the stocker. When the lower surface of the pressing bar comes into contact with the sheet-shaped bag, the pressing bar presses the opening end of the sheet-shaped bag,
4. The packaging machine according to claim 2, further comprising a pressing plate for releasing the pressing of the sheet-like bag when the stocker has moved downward from the contact position by a predetermined distance. 5. The holding plate is provided on a wall surface of the stocker on the opening side of the sheet-like bag so as to be vertically slidable with respect to the stocker. A stopper attached to the table is provided, and when the stocker rises, the presser plate presses the leading end of the opening of the sheet-like bag stacked on the stocker by its own weight, and moves the stocker downward by a predetermined distance. 5. The packaging machine according to claim 4, wherein when the stopper is pressed, the downward movement is restricted by contacting the stopper, and the pressing of the sheet-shaped bag is released.