JPS59406B2 - Automatic packaging machine bag holding/opening method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for holding a bag and opening a bag opening in an automatic packaging machine.

In this invention, a pair of holding claws is inserted into the opened bag mouth, the gap between the holding claws is opened and expanded outward to hold the bag, and then opening claws are inserted from both sides into the gap between the bag mouth. The bag opening is opened by pulling and expanding in opposite directions, and after the filling is put into the bag, the bag opening is sealed, and the opening claw is then removed from the bag opening. The bag holding/opening method and device of the present invention are simpler in structure when compared with the conventional bag opening method using a vacuum suction cup and the bag holding mechanism that clamps both ends of the bag mouth.

Furthermore, the device is capable of reliably holding and opening bags made of either thin film or thick film. First, the bag opening process of the present invention will be explained with reference to the drawings. Fig. 1 is a perspective view showing each process of bag holding and opening, etc. In Fig. A pair of holding arms 2, 2' having a
' is entered.

Next, the holding arms 2, 2' are operated to open as shown in the figure to expand the bag opening and hold both ends of the bag opening with the holding claws 3, 3/. When the bag 1 is held, in order to open the bag opening, the tips of the plurality of opening claws 4, 4 are raised as shown in Figure C and approached the bag opening, and the tips are opened as shown in Figure 2. Insert the bag into the gap in the opening of the bag, hang it there, and pull back the opening claws 4, 4 to open the bag, as shown in Figure E. When the bag mouth is opened, the hopper 5 located above the bag mouth is lowered, and its lower end enters the bag mouth as shown in the figure to throw the filling into the bag 1. After charging, the hopper 5 rises and returns to its original position. When filling is completed, the opening claws 4, 4
Raise the tip of the arm and release it from the bag opening, then hold the arm 2.
, 2/, the filling bag 11 is held together as shown in the figure. The filling bag 11 held by the holding arms 2 and γ moves to the bag opening sealing process shown in FIG. The bag is restored to its original state and the bag opening sealing process is completed. Holding arm 2 after sealing process
, 21 close and release the bag mouth from the holding claws 3, 3/, and the filling bag 11 descends as shown in the figure. As explained above, by opening and closing the pair of holding arms 2, 2/, the holding claws 3, 3' hold and open both ends of the bag opening, and the opening of the bag 1 is provided with a bag opening facing the bag opening. This is a bag holding/opening method in which the opening claws 4, 4 are hooked onto the bag opening and expanded to open the bag, and the tips of the opening claws 4, 4 are raised to return the bag opening to its original state.

The bag holding and opening method of the present invention makes it possible to easily hold and open bags made of thin materials, which had previously been considered difficult. The opening mechanism using a suction cup as the opening means has a complicated structure and requires a vacuum mechanism, but the method of the present invention has the advantage that the structure is simple and no compressor equipment is required. Next, a bag holding/opening device using the holding arms 2, 27 and the opening claws 4, 4 will be explained with reference to FIG.

First, the structure of the holding arms 2, 2/ will be explained with reference to FIGS. 2 and 3. A holder 29 that supports the disc 8 that rotates intermittently is mounted on the machine stand 16. A cam 9 that repeatedly rotates is provided at the center of the disk 8, and the cam mounting shaft 43 extends downward and passes through the holder 29, and a lever 30 is attached to the lower end of the cam 9. is equipped for repeated operation. A pair of gears 10, 10/ are attached to the lower surface of the disk 8 so as to mesh with each other, and the shaft of one of the gears 10 is extended to the upper surface of the disk 8, and a roller 15 is attached to the tip.
The opening/closing lever 12 having the above-mentioned opening/closing lever 12 is attached, and a spring 14 is hung between the spring-loaded pin mounted upright on the disk 8 and the same pin on the opening/closing lever 12. Attach the arm holders 13 and 135 with the holding arms 2 and 2/ attached under the gears 10 and 10/ on the lower surface of the disk 8, respectively.
The tips of the holding arms 2, 2/ are bent downward into a key shape, and are provided with holding claws 3, 3/ for holding the bag 1. The holding claw should be made of a material and shaped so that the bag opening will not slip off. The opening/closing mechanisms of the holding arms 2, 27 including the opening/closing lever 12 are arranged at appropriate positions radially from the center of the disc 8 as shown in FIG. 2, and are installed at four locations in the drawings of the embodiment. The disk 8 rotates intermittently in the direction of the arrow and stops intermittently at positions A, B, C, and D, respectively. The cam 9 rotates intermittently in the direction of the arrow until it reaches a position 9' indicated by a dotted line. Holding arm 2
, 27 is in the A position shown in FIG. 2, the rollers 15 of the opening/closing lever 12 are in contact with the protruding surface of the cam 9, so the gears 10, 101 rotate and the holding arms 2, 2/ close. do.

When the holding claws 3, 3' approach each other due to this closing operation, the bag 1 is opened and raised by a bag feeding device (not shown), and the holding claws 3, 3/ are placed in the bag opening. This bag feeding device uses the mechanism disclosed in Utility Application No. 1983-66355 by the present applicant. When the holding claws 3 and 3' enter the bag opening, the cam 9 rotates in the direction of the arrow E and reaches the 9/ position shown by the dotted line, and the roller 15 of the opening/closing lever 12 leaves the protruding surface of the cam 9, so that it is moved by the spring 14. Then, the opening/closing lever 12 is operated, and when the holding arms 2, 2/ are opened and operated, the holding claws 3, 37 expand the bag opening from A in FIG. 1 to hold the bag 1. As the cam 9 rotates to the 9/ position, the holding arms 2, 21 at the D position in FIG. 2 are closed by the operation of the opening/closing lever 12, and the filling bag 11 that has been held until now is released. .

When the bag 1 is held at the A position by the holding claws 3, 3', the disc 8 rotates intermittently in the direction of the arrow, and the holding arms 2, 2 at the A position are held.
The opening/closing mechanism including / moves to position B, and the cam 9
1 also rotates in the direction of arrow F and stops at the original position 9.

This bag holding device has a pair of holding arms 2, 2/
The bag 1 is held and removed by opening and closing operations, and the bag 1 is held from the A position to the B, C, and D positions, and the bag 1 is removed by the closing operation at the D position.

Next, a bag opening device including the opening claws 4, 4 will be explained. A third
A bag opening device as shown in the figure is provided. This bag opening device is shown in Figures 3, 6, 7, and 8, and includes a stand 34 on a stand 16 and a lever holder 20 thereon, and a pair of upright levers 22 on each lever holder 20.
, 22', and the upper end is connected to the connecting fitting 23.
, 23, and opening claw mounting brackets 24, 24 having opening claws 4 are mounted thereon. On one side of the lever holder 20, in order to operate the upright levers 22/, 22/, a pair of open-mouthed levers 21, 21 are attached to the lower end shafts 39, 39, and the tips of the levers are assembled as shown in FIG.
3 and are installed so that they can move up and down. Also, on different sides of the lever holder 20, there are claw lifting levers 25, 25.
are mounted so as to rotate about pivot shafts 41, 41, and their lever tips are also assembled and connected by pins 33/ as shown in FIG. Claw pull lever 25, 25
The rods 31, 31 are rotated about the rotation shafts 41, 41 as fulcrums, and the rods 31, 31 are connected to the upper opening claw mounting brackets 24, 24 from both ends.
provided to connect with the end of the Opening claw mounting bracket 24,
As shown in the figure, springs 32 and 32 are attached to one side of the upright levers 221 and 22, respectively, and springs 26 are attached to both of the lower parts of the upright levers 222 and 222.
Install across the board. Next, on both sides of the cylindrical stand 34, there are opening levers 21, 21 and a claw lifting lever 25.
In order to move the stand 25 up and down, a bearing 17 is provided on one side of the stand 34 with an opening fitting 19 attached to the upper part, a roller 27 at the lower end, and a sliding shaft 18 that moves up and down. The roller 27 is the cam 28 inside the machine base 16.
It is provided so as to be in contact with the outer peripheral surface of.

A bearing 35 is provided on a different side of the stand 34, with a claw lifting fitting 37 mounted on the upper end, a roller 27' at the lower end, and a sliding shaft 36 that moves up and down. is provided so as to be in contact with the outer peripheral surface of the cam 38. The cams 28, 38 are attached to a camshaft 42 and rotate. Next, to explain the holding/opening operation of the bag 1, the holding arms 2, 2' move from the closing operation to the opening operation at the A position in FIG.
The bag 1 held by the disc 8 is moved from the A position to the B position by the intermittent rotation of the disc 8.

FIG. 3 is a side view showing the bag opening device and the bag holding device with some parts omitted. In this state, when the bag 1 enters the center of the bag opening device and stops, the roller 27 is first lowered by the rotation of the cam 28. However, with this, the sliding shaft 18 descends, and the pin 33 in contact with the mouth opening fitting 19 descends due to the contraction force of the spring 26 attached to the upright levers 227, 2γ, rotating the mouth opening levers 21, 21. As shown in FIG. 4, a pair of opposing upright handles 22, 22/ move forward toward the bag 1 and stop the opening claws 4, 4 at a position above the bag opening. When the tips of the opening claws 4, 4 reach the soil at the bag opening, the claw lifting levers 25, 25 are activated to move the tips of the opening claws 4, 4 into the bag opening, as shown in Fig. 5. . A perspective view of this state is shown in FIG. 1-2. The operation of lowering the tips of the opening claws 4, 4 will be further explained with reference to FIG.
The pin 33', which comes into contact with the claw lifting metal fitting 37, is pulled up by the contracting force of the springs 32, 32 attached to the upright levers 22, 22 and the opening claw mounting metal fittings 24, 24.
5 and 25 are lowered by rotating them about the rotating shaft 41, and both rods 31 and 31 are pushed up to lower the tips of both opening claws 4 and 4. At the same time as the tips of the opening claws 4, 4 are inserted into the bag opening shown in FIG. 33 and a pair of upright levers 22 facing the opening levers 21, 21,
2γ is opened and operated as shown in FIG. By this opening operation, the opening claws 4, 4 catch the bag opening and expand it, so that the bag opening is opened as shown in the plan view of FIG. In FIG. 8, only the opening of the bag 1 is shown, and the lower part of the bag is not shown. When the bag opening is opened by the opening claws 4, 4, the holding arm 2, which has been holding the bag 1 by expanding the bag opening,
, 2' are spaced apart as shown in FIGS. 7 and 8, and in this case, the holding arms 2, 2' shown in position B in FIG.
will be placed in the center.

This means that the roller 15 of the opening/closing lever 12 is separated from the outer peripheral surface of the cam 9 and the spring 14 is stretched, but the contracting force of the spring 14 always applies a force to the bag opening that causes the holding arms 2 and 25 to open and expand. It is being When the bag opening shown in FIGS. 6 and 8 is opened, air is injected into the bag from an air jet nozzle (not shown) provided above the bag opening, and the inside of the bag is further expanded. Similarly, the hopper 40 provided above the bag opening device is lowered, and the lower end of the hopper enters the bag opening as shown in FIG. 140 rises and returns to its original position.

When the hopper 40 begins to rise, the roller 27' rises due to the rotation of the cam 38, and the sliding shaft 36 and the claw lifting fitting 37 also rise.
' is pushed up and the pawl pulling levers 25, 25 are connected to the rotating shafts 41, 4.
1 as a fulcrum, lower both rods 31, 31, rotate the opening claw mounting brackets 24, 24, and attach the opening claws 4, 4.
The tip of the bag is lifted up as shown in Fig. 3 to remove it from the bag opening. The filling bag 11 is held by the expansion of the holding arms 2 and 2' as shown in FIG. 1, and moves from the B position to the C position in FIG. As shown in FIG. is moved to the position D in FIG. 2 while being held by the holding arms 2, 2/.
When the filling bag 11 stops at this D position, the cam 9 on the disc 8 rotates in the direction of arrow E and reaches the dotted line 9' position, and D
The roller 15 of the opening/closing lever 12 in the position contacts the protruding surface of the cam 9' and closes the holding arms 2, 27. As shown in the first diagram, the bag opening is separated from the holding claws 3, 3', and the filling bag 11 is released. It descends and moves on to the next process. The holding arms 2, 2' from which the filling bag 11 has been released move to position A with the next intermittent rotation of the disk 8 while remaining closed, but at the same time as the disk 8 moves intermittently, the cam 9' rotates in the direction of arrow F. Then, it reaches the 9 position and shifts to the operation of receiving the next bag 1. As the disk 8 rotates intermittently, the bag holding devices disposed at various points on the disk 8 operate the bag opening device installed at position B to hold and open the bags that are sequentially supplied.

As explained above, this bag holding/opening device is equipped with a pair of gears meshing with each other on the lower surface of a disc that rotates intermittently, and on the lower surface of both gears is a holding arm with a key-shaped tip and a holding claw at the end. An opening/closing lever is provided on the top surface of the disc that is linked to one of the gears, and is engaged with a spring mounted on the disc.A pair of holding arms for opening/closing these are arranged at important points on the disc. The roller provided at the tip has a bag holding device arranged so as to be in contact with the outer peripheral surface of the cam provided at the center of the top surface of the disc, and a pair of upright levers are provided on the lever holder, each facing the other, and are attached to the upper ends of both upright levers. The opening claw mounting bracket has opening claws with key-shaped tips facing each other, and one side of the lever holder has an opening lever that interlocks with the upright lever, and the other side has a rod that connects with the opening claw mounting bracket. A bag opening device, which has an interlocking pawl pull-up lever and operates both the mouth-opening lever and the pawl-lift lever as appropriate, is arranged at a position where the bag holding device stops rotating intermittently.

The present invention makes it possible for this device to reliably hold and open both rigid and flexible bags.

In addition, although two opening claws 4, 4 are provided as a pair in the figure,
It is also possible to install four opening claws facing each other, and the number of opening claws is not limited to a pair of two.

Additionally, cams were used to move the sliding shafts 18 and 36 up and down.
It is also possible to operate up and down using an air cylinder, and is not limited to cam operation.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view showing the method and order of bag holding and opening according to the present invention, Fig. 2 is a plan view of the bag holding device, Fig. 3 is a side view of the bag holding device and the bag opening device, and Fig. 4 is a side view of the bag holding device and the bag opening device. 5 is a side view showing the operation of the bag opening device, FIG. 6 is a side view of different sides of the bag opening device, FIG. 7 is a front view of a part of the bag holding device and the bag opening device, and FIG. The figure is a plan view of the bag opening device, FIG. 9 is an exploded perspective view of the bag opening lever, and FIG. 10 is an exploded perspective view of the claw pull lever. 1: Bag, 2, 21: Holding arm, 3, 3': Holding claw, 4
: Opening claw, 82 disk, 9: Cam, 10,107: Gear,
12: Open/close lever, 14: Spring, 15: Roller, 2
0: Lever holder 21: Opening lever 22, 221:
Upright lever 23: Connecting metal fittings, 24 opening claw mounting metal fittings, 2
5: Claw lift lever, 31: Rod, 16: Machine base, 19
: Mouth opening fitting 34: Stand, 37: Claw lifting fitting.

Claims (1)

[Scope of Claims] 1. A pair of holding arms each having holding claws whose tips are bent into a key shape stretch and spread the bag opening by an opening action rather than a closing action of a pair of holding arms having holding claws whose tips are bent into a key shape. A process of expanding and holding the bag in a flat shape and releasing the bag opening from the holding claw by closing the holding arm, and using a plurality of opposing opening claws with key-shaped tips at the center of the flat expanded bag opening to open the bag inside the bag mouth. A bag holding/opening method for an automatic packaging machine comprising the steps of hooking the bag onto a bag, stretching and opening the bag opening, lifting the tip of an opening claw to separate from the bag opening, and returning the bag opening to its original flat and expanded state. 2 A pair of interlocking gears are provided on the underside of a disc that rotates intermittently, a holding arm having a holding claw with the tip bent downward into a key shape is provided on the underside of the pair of gears, and a holding arm that is interlocked with one of the gears is provided on the top of the disc. A pair of holding arm opening/closing mechanisms in which the opening/closing lever is engaged with a spring mounted on the disk are arranged at key points of the intermittently rotating disk, and a roller provided at the tip of each opening/closing lever is provided. a bag holding device provided so as to be in contact with the outer peripheral surface of a cam provided at the center of the upper surface of the disc;
A stand is fixed on the machine base below the intermittent rotation stop position of the holding arm, and a lever holder is attached to the stand. Each lever holder is equipped with a pair of upright levers facing each other, and the upper end of each upright lever is An opening claw mounting bracket is provided that is connected by a connecting metal fitting and rotates to cover the top of the connecting metal fitting, and both opening claw mounting metal fittings have opposing opening claws bent into a key shape with the tips facing downward. One side of the lever holder is provided with an opening lever that connects to the lower end of the upright lever, and the other side is provided with a claw pull-up lever that connects with the lower end of the upright lever, and both ends of the claw pull-up lever are connected with rods. A bag holding/opening device for an automatic packaging machine comprising a bag opening device provided with a mouth opening metal fitting and a claw lifting metal fitting which are connected to each other and actuate both the mouth opening lever and the nail lifting lever.