JPS63272634A - Mouth opening apparatus of packing bag - Google Patents

Abstract

PURPOSE:To allow a packing bag to stand-by in such a state that the mouth part thereof is forcibly opened into the shape conforming to the shape of an article to be inserted, by mounting four forcible opening members for forcibly opening the packing bag to be allowed to cover at four points inside said bag and an interval regulating means for regulating the mutual intervals between said forcible opening member. CONSTITUTION:A guide rod 41 is screwed to left and right support poles 43 by screwing parts reversed to each other and driven in both of forward and reverse directions by a handle 45 through a chain 52 to allow the support poles 43 to be spaced apart and approach each other. Forcible opening members 46, 47 for forcibly opening the mouth part (b) of a packing bag are fixedly provided to the lower ends of the left and right support poles 43 and air cylinders 48 are fixedly mounted on the left and right support poles 43 and forcible opening members 50, 51 are respectively mounted to the lower ends of the piston rods 48a of the air cylinders 48. The left-hand members 46, 50 and the right-hand members 47, 51 are opened and closed in the left and right directions corresponding to the separation and contact of the left-and-right support poles 43, and the members 46, 47 on the lower side and the members 50, 51 on the upper side are opened and closed in the up-and-down direction by the up-and- down movement of the members 50, 51 on the upper side accompanied by the expansion and contraction of the air cylinders 48, 48.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bag opening device for a packaging bag. In a packaging machine, it is used to open a packaging bag into which articles can be inserted.

(Prior Art) Conventionally, it has been common practice to package articles by inserting them into a plastic bag or the like with one end left open. However, since bags are usually provided with the front and back walls in close contact with each other, it is difficult to fully open the bag and insert articles into the bag, and this is not automated.

(Problems to be Solved by the Invention) It is difficult even manually to open the bag opening of a packaging bag that is opened at one end and the front and back sides are in close contact with each other, and it is difficult to open the bag opening in a state where an item can be inserted into the opened bag opening. It's not easy either. This requires manpower, laborious work, and high packaging costs.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides, as a first invention, four push-opening members that push open a packaging bag to be covered with four points on the inside, and The present invention is characterized by comprising a distance adjusting means for adjusting the mutual distance between the two push-open members.

As a second invention, in addition to the first invention, there is further provided a bag feeding means for suctioning the opening of the packaging bag from both sides, pulling it apart to pre-open it, and placing the packaging bag in the pre-opened state on the push-opening member. It is characterized by the fact that it is equipped with

(Function) In the first invention, the four push-opening members are initially adjusted by the spacing adjustment means to a mutual distance that allows the bags to be covered with the bag opening slightly open, so that the packaging bag can be covered with the bag opening only slightly opened. can be made possible.

When the packaging bag is placed on the push-opening member, the distance between the push-opening members is again adjusted by the spacing adjustment means,
The covered packaging bag can be pushed open from four points inside the bag and held at a predetermined position. The opening shape of the bag mouth of the packaging bag by this pushing-opening process can be determined by the positional relationship of the four push-opening members, and the positional relationship can be determined by the interval adjustment means to match the shape of the article to be inserted. Can be done.

In the second aspect of the present invention, the packaging bag is further configured such that the bag opening is suction-held from both sides by a suction holder of the bag feeding means, and the bag wall to which the bag opening is in close contact is separated to the both sides by the suction. The opening of the bag can be pre-opened by using the suction holder, and the packaging bag is transferred with the opening of the bag in front while the pre-opened state of the opening of the bag is maintained from the outside by the suction holder. A packaging bag can be automatically attached.

(Example) An example of the present invention shown in the drawings will be described. This embodiment shows the case of an automatic packaging machine in which a predetermined number of laminated bags A are placed in a packaging bag B as an object to be packaged and sealed to form a package C, as shown in FIG. As the overall structure of this automatic packaging machine is shown in Fig. 1, a bag supply stocker 1 is installed at an appropriate height to stack a large number of packaging bags B on the leftmost side and feed them one by one. It is being

A workbench conveyor 2 is provided on the right side of the bag supply stocker 1 and serves as a workbench for receiving the packaging bags B from the bag supply stocker 1 and for discharging the packaged items in the direction of arrow a. Further to the right of the 0 workbench conveyor 2, the bag group A is contained in the packaging bag B supplied to the workbench conveyor 2.
The bag opening of the packaging bag B to be supplied onto the workbench conveyor 2 is placed between the workbench conveyor 2 and the workbench conveyor 2 in which the packaged article supply means 3 for inserting the packaged article is provided. A push-opening means 4 is provided for holding the bag in a predetermined open state for insertion of the bag group A. Said bag supply stocker 1
is provided with a bag feeding means 5 for pulling out the packaging bags B accommodated therein one by one and feeding them onto the workbench conveyor 2, and placing the bag opening on the pushing-opening means 4. Further, the bag supply stower 1 is shown in FIG. 1, and is provided with a sealing means 6 for sealing the bag opening of the packaging bag B after the bag group A is inserted between the push-opening means 4 and the workbench conveyor 2. The front and rear guide walls 12, 13, 14, and 15 are placed on the base 11, and the positions of the left, right, and rear guide walls 13, 14, and 15 can be adjusted according to the bag size. B is positioned by pressing it against the center.

As shown in FIGS. 1 and 3, the bag feeding means 5 has a pair of L-shaped side plates 21 that straddle the bag feeding storf 1 from side to side, and upper and lower clamp bodies 22 for clamping the package C between the side plates 21.
23, and upper and lower suction heads 24 and 25 that suction the bag opening of packaging bag B from the front and back to a predetermined pre-opened state and feed and transfer the bag.
It is equipped with. The side plates 21 are connected by a floor plate 26 located directly above the bag supply stocker 1, and the upper part of each side plate 21 is guided by parallel guide rails 27, 28, so that the clamp bodies 22, 23 and the suction head 24. 2
A bag supplying means 5 having a bag supplying means 5 is movable back and forth between the tip end position of the bag supplying stocker 1 and the pushing-opening means 4.

A rack 27a is formed on one guide rail 27, and a pinion 29 that meshes with the rank 27a and a pulse motor 30 for driving the pinion 29 are provided on the side plate 21 on the side guided by this guide rail 27. The bag feeding means 5 is moved back and forth by driving.

The lower clamp body 23 and the suction head 25 are bar-shaped and are attached to the side plate 2.
It is held in such a state that it is connected between the lower sides 21a of the bag supply stocker 1, and is moved while maintaining the level directly below the bag supply stocker 1. On the other hand, the upper clamp body 22 and the upper suction head 24 are supported on the floor plate 26 so as to be movable up and down.

This support structure is as shown in FIG.
The piston rod 31 of the first air cylinder 31 attached to
A first elevating platform 32 under the floorboard 26 is connected to a, and a guide rod 32a erected on the first elevating platform 32 is fitted into a guide 33 on the floorboard 26 to guide the elevation. . Also, a second air cylinder 34 attached to the first lifting platform 32
A second elevating table 35 below the first elevating table 32 is connected to the piston rod 34 a of the first elevating table 32 . 36 to guide elevation. The upper clamp body 22 and the upper suction head 24 are held on the second elevating table 35 by third and fourth air cylinders 37, 38 so as to be movable up and down via their piston rods 37a and 38a.

As a result, the upper clamp body 22 and the upper suction rod 24
is raised and lowered simultaneously by the raising and lowering of the first lifting table 32 by the first air cylinder 31 and the raising and lowering of the second lifting table 35 by the second air cylinder 34, whereas the raising and lowering by the third air cylinder 37 The clamp body 22 is raised and lowered independently, and the rod 24 is raised and lowered independently to the upper suction by the fourth air cylinder 38.

As shown in FIG. 1, the push-opening means 4 consists of left and right support columns 4 guided by upper and lower guide rods 41 and 42 so that they can be moved toward and away from each other.
It has 3. One of the guide rods 41 is the left and right support pillars 4.
3 with screws in opposite directions, and is driven by a manual handle 45 in either forward or reverse directions via a chino 52 to move the support columns 43 toward and away from each other.

The lower ends of each of the left and right support columns 43 have push-opening claws (
Push-opening members) 46 and 47 are fixedly installed, and are located slightly above the installation level of the upper suction head 25 and protrude toward the bag supply stocker 1. Further, an air cylinder 48 is fixed to each of the left and right support columns 43, and at each lower end of the piston rod 48a there is another push-open claw (push-open member) that faces each of the push-open claws 46, 47 from above. 50
．． 51 are attached respectively so that they can be moved up and down.

As a result, the left side push-opening claw 46.50 and the right side push-opening claw 47.51 are opened and closed in the left-right direction according to the engagement and separation of the left and right support columns 43, and the lower push-opening claw 46.47 and the upper push-opening claw 46.47 The push-open claw 50.51 is opened and closed in the vertical direction by the vertical movement of the upper push-open claw 50.51 as the air cylinder 48.48 expands and contracts.

As shown in FIG. 1, the sealing means 6 includes a lower seeker 61 fixedly installed at approximately the same level as the workbench conveyor 2, and an upper seeker provided to move up and down under the guidance of a guide rod 62 and a guide hole 63. 64, the upper seek 64 is connected to a piston rod 65a of an air cylinder 65, and is moved up and down by the air cylinder 65 so as to be brought into contact with and away from the lower seek 61.

The packaged article supply means 3 is shown in FIG. 1, and is explained in more detail in FIG. 2. As shown in the figure, it has a base frame 72 that can be raised and lowered by being guided by guide rods 71 at its four corners. The rear part of the base frame 72 is connected to a rodless air cylinder 73 through a moving element 73a to a shock absorbing bush 74, and is raised and lowered by only one side being driven by the movement of the moving element 73a of the air cylinder 73. However, the base frame 72 has a pinion 75 that meshes with a rack 71a formed on each guide rod 71.
are provided and interlocked with each other, so that the entire base frame 72 can be raised and lowered while maintaining the same level even by the one-sided drive.

In addition, balance weights 76 are connected to the left and right sides of the portion of the base frame 72 on the side where one side is not driven, to reduce the large lifting resistance due to not being directly driven.

L-shaped side plates 77 are vertically fixed on the rear left and right sides of the base frame 72 when viewed from the side.
A guide roller 78 is installed between the leading ends of a to connect them. Further, a movable table 80 is provided inside the base frame 72 and guided by a guide rod 79 so as to be movable back and forth. The moving table 80 has a pinion 81 that meshes with a rack 79a formed on the guide rod 79 and its drive motor 8.
2, and the movable table 80 is moved back and forth by forward and reverse driving of the pinion 81 by the motor 82.

A fixed support column 91 is vertically fixed in the center of the moving table 80 in the left and right direction, and movable support columns 93 and 94 that can be moved in and out of position while being guided by two front and rear guide rods 92 are vertically held on both left and right sides of the fixed support column 91. ing. An L-shaped auxiliary side plate 95 is provided on the outside of each movable support column 93 and 94, and is located between the side plate 77 and the side plate 77.
The upper and lower two parts are guided by guide rods 97 and 98 so that they can be moved toward and away from each other. Lower side 9 of each auxiliary side plate 95 on the left and right
There is no connecting part between the tips of 5a, and the cross-section is shaped like a triangle to ensure sufficient rigidity.

The guide rods 97 and 98 have threads in opposite directions screwed into each of the left and right auxiliary side plates 95, and both guide rods 97 and 98 are connected by a chino 99, and the outer surface of the side plate 77 of one of the guide rods 97 is Hand operated handle 10 on the protruding part
0 is installed. As a result, when the guide rods 97 and 98 are driven forward and backward with the handle 100, the left and right auxiliary side plates 95 can be moved toward and away from each other.

Each of the left and right auxiliary sides vi95 and each movable support column 93.94 are connected by an air cylinder 101 between the two that come into contact with each other, and each movable support column 93.94 are interlocked via the air cylinder 101, and as the air cylinder 101 expands and contracts, it is pushed inward from the left and right auxiliary side plates 95 and approached by a certain amount, and is pulled back from the approaching position to the initial setting position by the left and right auxiliary side plates 95. be separated.

A pair of clamping bars 111, 112 for clamping the bag group A, which is the object to be packaged, and inserting it into the packaging bag B are provided at the lower end of each support column 91, 93, 94, respectively. Each pair of clamping bars 111.112 has a lower bar 111 attached to each support column 91.
The rear end of the upper bar 112 is connected to the cylinder rod 113a of the air cylinder 113 attached to each support column 91.93.94, and the lower end of the upper bar 112 is fixed to the lower end of the support column 93.94. An upper bar 112 is moved toward and away from the bar 111 so as to be able to clamp the bag group A and release the clamping. The upper bar 112 is attached to each support column 91.93.
．． The vertical movement is guided by two or one guide rod 114 held at 94.

Each of the bars 111 and 112 is supported only at the rear as described above and is supported by a cantilever, but each has a single or double row channel shape or an L shape, as clearly shown in FIG. This gives it sufficient rigidity. Since each bar 111 and 112 has such a cross-sectional shape, when bag group A is held between them, bag group A is formed as shown in FIG.
can be made to wave in the width direction, making it easy to insert bag group A into packaging bag B with little room.

A pair of holding bars 111 and 112 are provided at the front end of the base frame 72.
A presser roller 121 is provided opposite to the presser roller 121 from above. A pair of central clamping bars that do not move left and right 111.11
The center presser roller 121 facing the base frame 72
It is supported by an air cylinder 123 on a support column 122 which is vertically fixed. On the other hand, the left and right presser rollers 121
is supported by an air cylinder 123 on a movable support column 125 that is guided so as to be movable left and right by a guide rod 124 in the front end channel of the base frame 72.

Each movable support column 125 is connected by a guide bar 128 to a movable support column 127 that is guided so as to be movable left and right by a guide bar 126 in the rear end channel of the base frame 72, and this guide bar 128 is connected to the movable support column 93. It runs longitudinally through an attached member provided on the outer surface of the .94. As a result, the movable support column 9
3.94 is also guided by the guide rod 128 during the back and forth movement associated with the back and forth movement of the movable table 8o, and is guided by the handle 100.
A guide rod 128 is used for the detachment operation by the air cylinder 101.
are moved simultaneously, and the guide rod 128 moves the both side pressing rollers 121 toward and away from each other via the movable support column 125, and the pair of holding bars 121 on both sides are moved together.
11. Maintain a state of confrontation with 112 at all times. Note that each air cylinder 101 and each movable support column 93, 94 are connected via a guide rod 128, and the side plate 77 can move back and forth even though the left and right auxiliary side plates 95 do not move back and forth.

A clamp lever 131 is provided at the tip of the lower side 95a of each of the left and right auxiliary side plates 95 to temporarily clamp the bag group A received on the lower bar 111 between the lower bar 111 and the clamp lever 131 is operated by an air cylinder 132 or the like. That's how it is.

A body frame 141 is positioned on the outside of the side plate 77 at a distance. Between the side plate 77 and the frame 141, a retracting chino 142, 142 for retracting the bag group A between a pair of open holding bars 111, 112 is provided, and a drive installed between these chinos 142, 142. axis 14
Clamping pawls 145.14 cooperating with each other on 3.144
6 is fixed, and each clamp claw 145, 146 is connected to lever 1.
47 and an air cylinder 148 to open and close the clamp claws 145 and 146, so that the bag group A can be clamped or unclamped.

The operation of the mechanism is controlled by a microcomputer (hereinafter referred to as microcomputer), and FIG. 4 shows a block diagram for main operation control. An input section of the microcomputer 151 is connected to a packaged article data input means 152 for inputting data on the packaged article, that is, information such as the planar dimensions and bulk of the bag group A and the like. Also, the interval adjustment means 1
An air cylinder 48, which is a driving means for the movable push-opening claws 46 and 47, is connected to an output section 53, and an output section, which is a bag feeding control means 154, is a means for driving the preliminary opening operation of the bag feeding means 5. The first, second, third, and fourth air cylinders 31, 34, 37, and 38 are connected to a pulse motor 30, which is a bag feeding operation driving means.

A series of wrapping operations will be explained below with reference to FIGS. 5 to 18.

In the initial state shown in Figure 1, the retractable chino 142.14
2 is driven forward in the direction of arrow C, and the clamp claw 145.
The bag group A clamped by 146 is held by a pair of clamping bars 111 whose upper bar 112 is moved upward and opened as shown in FIG.
．． It pulls in between 112 and 112. When the bag group A is retracted to the state shown in FIG. 5, the ceno 142 is stopped. At the same time, the clamp lever 131 is moved to clamp the rear end of the bag group A between it and the lower bar 111 and clamp it at a predetermined retracted position as shown by the imaginary line in FIG.

After the clamp claws 145 and 146 are unclamped in this state, the chino 142 is driven forward again and the clamp claw 1
45. Move 146 to the virtual line position in Figure 5. As a result, the clamp claws 145 and 146 are removed from the bag group A clamped at the predetermined retracted position, and the bag group A settles on the lower bar 111 under its own weight as shown by the imaginary line in FIG.

Cheno 142 is then reversely driven to engage clamp pawl 145 .
146 is evacuated from between the pair of clamping bars 111 and 112 and moved to the position where the next bag group A is received. When the clamp claws 145 and 146 have completed retraction, the upper bar 1
1 and 2 are moved downward, and the bag group A is held between a pair of holding bars 111 and 112 to make it bulkier as shown in FIGS. 6 and 7. Note that the pair of gripping bars 111 and 112 on both sides are attached to the handle 10.
The spacing is adjusted so that bag group A can be held at appropriate positions on both the left and right sides by operation 0. In the clamping state, the cross-sectional shape of the pair of clamping bars 111 and 112 causes the bag group A to be undulated in the width direction as shown in FIG. 7, and the natural width W0 is reduced to W.

In this state, the base frame 72 is moved upward, and the pair of clamping bars 111
．． 112 and a guide roller 78 that supports the lower end of the guide roller 78.
At the same time, the bag group A is moved upward and brought into pressure contact with the pressing roller 121 waiting above as shown in FIGS. 8 and 9, thereby making the bag group A even more bulky. This position is the insertion height position of the packaged object shown in FIG. During the state change from FIG. 6 and FIG. 7 to FIG. 8 and FIG. The width W1 of the bag group A is made smaller than the width W2.

At the same time, the bag feeding means 5 is operated from the initial state shown in FIG. 1 to the bag feeding state shown in FIG. 14. Regarding this, the first air cylinder 31 is operated in the initial state shown in FIG. 1, and the bag feeding means 5 is moved as shown in FIG. Then, the top surface of the bag opening of the top packaging bag B stored in the bag supply stocker 1 comes into contact with the upper surface and that part is sucked. In this state, the upper clamp body 22o and the upper suction head 24 of the bag feeding means 5 are moved upward by the action of the first air cylinder 31, and the bag mouth is first brought out to the upper part of the stocker 1. Thereafter, the bag feeding means 5 is moved forward and attracts the bag opening. The packaging bag B is pulled out from the stocker 1 as shown by the imaginary line in FIG. 11, and the upper clamp body 22 and the upper suction head 24 are moved downward by the action of the first and second air cylinders 31 and 34.

As a result, the packaging bag B is pulled out as shown in the imaginary line in Figure 11.
The lower suction head 25 also attracts the back surface of the bag opening by sandwiching the bag opening between the upper and lower suction heads 24 and 25.

In this state, the upper suction head 24 is moved upward by the fourth air cylinder 38 as shown by the solid line in FIG. Separate the back wall vertically, and
3 Preliminarily open the bag opening as shown in Figure 3.

Here, the left push-open claw 46.50 and the right push-open claw 47
．． 51 is set to an interval that secures the acceptance width W1° of the bag group A as shown in FIG. 15 of the bag opening by operating the handle 45, but the bag opening in the preliminary opening state is The width W, since it is still flat. It has a width dimension W11 that greatly exceeds .

When the bag opening is preliminarily opened as shown in FIGS. 12 and 13, the bag feeding means 5 is then further advanced to feed the preliminarily opened packaging bag B to the object insertion position shown by the imaginary line. The push-open claws 46, 47. are waiting in the state shown in FIG.
50.Put the pre-opened bag mouth on 51.

After this, the second part of the upper clamp body 22 and the upper suction head 24
With the air cylinder 34 in the released state, the upper push-opening claws 50, 51 are moved upward while pushing back the upper clamp body 22 and the upper suction head 24. This allows the bag opening to be opened by the upper clamp body 22, the upper suction head 24, and the push-open claws 50.51.
and the receiving width W, with the upper side wall of the bag opening sandwiched between. Fig. 14, 1.
5. Push outward as shown in Figure 5. As a result, the bag group A having the reduced bulk (and reduced width W2) and the bag opening face each other as shown in FIG. 15, and the bag group A can be inserted into the bag opening without mutual interference.

Next, after moving the upper clamp body 22 and the upper suction head 24 upward to the initial operating height using the air cylinder 34,
The bag feeding means 5 is moved backward, and the upper clamp body 22 and the lower suction pad 24 are moved backward to the position indicated by the imaginary line in FIG. 15.

In this state, the movable table 80 of the base frame 72 is advanced, and the pair of clamping bars 111 and 112 are advanced. At this time, the pair of clamping bars 111 and 112 move forward while being pressed and guided by the upper and lower presser rollers 121 and the guide rollers 78, keeping the bag group A in the positional relationship with the bag opening shown in FIG. Insert into packaging bag B as shown in Figure 16. Therefore, failure to insert bag group A does not occur.

When the insertion of the bag group A is completed, the upper clamp body 22 is moved down by the third air cylinder 37 as shown by the imaginary line in FIG. It is held between the body 23 and the body 23. This clamping is performed by the slits 1lla and 112a provided in the pair of clamping bars 111 and 112 on both sides, as shown in FIG. 2, so that there is no interference with the pair of clamping bars 111 and 112.

Therefore, when the package is being held, the pair of holding bars 111 are moved by the rear end of the moving table 8o as shown in FIG.

112 is pulled out from the packaging bag B, but the sandwiched state of the package does not get in the way. As a result, the package C is stably held in a fixed position on the workbench conveyor 2 by the pair of clamping bars 111.
．． 112 is removed.

Thereafter, as shown in FIG. 18, the upper sealer 64 is moved downward to seal the bag opening with the lower seal 561, and the bag feeding means 5
is returned to its initial state to complete one packaging operation.

Thereafter, the same operation is repeated and packaging is performed sequentially (effects of the invention) According to the first aspect of the present invention, since it has the above-mentioned structure and operation, even when packaging is performed using a packaging bag that is opened at one end, the bag of the packaging bag is not used. Just by opening the mouth a little, the receiver can be inserted into the container, pushed open to match the shape of the item to be inserted, and then left on standby, so it is possible to open the packaging bag in the form of a cane at one end and insert the item automatically. can be done reliably.

Further, according to the second invention, since it has the above-mentioned structure and operation in addition to the first invention, even a packaging bag that is open at one end and whose front and back sides are in close contact with each other can be automatically supplied with the bag opening in a pre-opened state. It can be used to open the bag mouth for inserting articles.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view of the packaged material supply means, Fig. 3 is a side view of the feeding means, and Fig. 4 is a partial block of the control circuit. The wiring diagram and FIGS. 5 to 18 are side views and front views of each part showing the operating state.

Claims (2)

[Claims] (1) A bag opening of a packaging bag characterized by having four push-open members that push open the packaging bag to be covered at four points on the inside, and an interval adjustment means that adjusts the mutual distance between these four push-open members. Opening device. (2) Four push-open members that push open the packaging bag to be covered at four points on the inside, a distance adjustment means that adjusts the mutual distance between these four push-open members, and a suction holder that opens the bag opening of the packaging bag from both sides. A bag mouth opening device for a packaging bag, comprising a bag feeding means for adsorbing and pulling the bag to pre-open it and placing the pre-opened packaging bag on the push-opening member.