JPS5852169Y2 - bag feeding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for feeding a large number of packaging bags stacked on a table one by one from the top to a packaging function section.

Since automatic bagging machines perform their bagging function at a relatively high flow rate in order to increase packaging capacity, they must also use mechanical power to feed bags.

Therefore, conventionally, as shown in Fig. 5, a suction cup 3 is provided through a tubular arm 2 on a tubular shaft 1 whose one end is connected to a vacuum pump. A device is provided that sequentially takes out a large number of bags 4, 4, . . . from the top.

In such a device, the suction cup 3 attracts the opening edge of the bag 4 and pulls the bag as shown by the arrow.The bag is fed with the bottom down and the mouth up. You can put whole or packaged items into the container.

However, when the top bag 4a is peeled off from the bag layer, a negative pressure layer of air is formed between the iron 4a and the second bag 4b, so that up to a certain height the second bag 4b is separated from the top layer. The position shifts as it follows bag 4a, and the edge of the topmost bag also drags on top of the second bag, so the synergistic effect of these causes the position shift to become even larger, and the next There was a drawback that the accuracy of supplying was hindered.

However, if the rotational speed of the arm is reduced, the above-mentioned tracking phenomenon will not occur, but this has the disadvantage of reducing efficiency.

In view of the above points, the bag feeding device of the present invention is provided with an obstruction bar along the upper part of the rim of a large number of bags stacked on a table, and a bar is provided at a position outside the rim of the bag. A shaft is installed parallel to the bar, an arm protrudes from the circumferential surface of the shaft so as to straddle the bar, and a suction cup is arranged at the tip of the arm so as to face the mouth edge of the bag inside the bar. A power transmission mechanism is provided in which the suction cup is fixed, and a reversing mechanism that drives the shaft is used to invert the suction cup between a position where the bag is present and a position where the swing rod is present, and the suction cup is configured to rotate the bag. When lifting, the table is moved downward so as to separate from the bar, and the bag is lifted up into a chevron shape with a suction cup while holding the opening of the bag with an obstacle bar, thereby discharging air below the bag. While this facilitates the flow of bags, the table is lowered at the same time as the bag is lifted to eliminate surface friction between the topmost bag and the second bag.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, a large number of bags A, A... are stacked neatly on the table 10, and the bag A
A tubular shaft 11 is disposed outside the mouth part a.

As shown in FIG. 2, the shaft 11 has a pair of left and right bearings 12.
, 12, and is connected to the shaft 11 and a vacuum pump (not shown) via a tube 13.

Further, the bar 14 is installed between the bearings 12.12 so that the bar 14 is positioned above the mouth edge of the bag A, and the tubular arm 15.15 is connected to the shaft 11.
A suction cup 16.16 provided through the bar 14 faces the mouth edge of the bag A inside the bar 14.

Further, a chain wheel 17 is fixed to one end of the shaft 11, and one end of the chain wheel 18 hooked on the chain wheel is connected to a fixing pin via a coil spring 19, and the other end is connected to a frame 22 via a pin 21. Each of the levers 23 is connected to one end of the supported lever 23, and the other end of the lever 23 is pressed against the circumferential surface of the cam 24 by the tensile force of the spring 19.

Further, another cam 25 is installed coaxially with the cam 24, and a bell crank 26 is provided with one end in contact with the cam 25, and a swing rod 27 supported on the frame 22 is connected via a crank rod 28. It is connected.

As shown in FIG. 2, the rocking rods 27, 27 are connected at right angles to a tubular shaft 29 rotatably supported between a pair of frames 22.22, and the upper surface of the rocking rods 27.27. The suction holes 30, 30, etc. formed in the same rod and shaft 29
, and are connected to a vacuum pump through the inside of each of the hoses 31.

Furthermore, a sleeve 34 is fixedly arranged at the lower part of the table 10, and the lower surface of the table 10 and the lever 23 are connected via a rod 35 slidably inserted into the sleeve 34. A spring 36 is interposed between the table 10 and the table 10.

The present invention is constructed as described above, and its operation will be explained below.

In FIG. 1, the two cams 24 and 25 are coaxial and rotate continuously in the clockwise direction.
3 is made to swing around the pin 21.

When the lever 23 swings clockwise, the spring 19 is stretched and the ceno 18 is pulled in the direction of the arrow.
Since the Cheno wheel 17 is rotated, the suction cup 16 is attached to the shaft 11.
Rotate counterclockwise around the center.

When the chino 18 is pulled in the opposite direction by the reaction force of the spring 19, the suction cup 16 returns clockwise.

In this way, the suction cup 16 repeats the reverse movement, while the table 10 is moved up and down by the rod 35 and the spring 36.

On the other hand, when the bell crank 26 is oscillated by another cam 25, the oscillating rod 27 integrally with the shaft 29 performs a reversal movement between the inter-body movement position of the suction cup 16 and the position of the packaged material supply hopper 32. Repeat.

First, the bag feeding action of the suction cup 16 will be described.

That is, when the suction cup 16 attracts the vicinity of the rim of the uppermost bag A1 of a large number of stacked bag layers and then the reversal action begins, the rim of the uppermost bag A1 is attached to the other bag layers as shown in FIG. However, in this case, since the bar 14 exists as an obstacle above the rim of the uppermost bag A1, the rim portion cannot be lifted.

The part slightly below the rim of the mouth is raised.

However, at the same time, the table 10 begins to move downward against the force of the spring 36.

Therefore, air flows under the floating uppermost bag A1, and the negative pressure phenomenon between the uppermost bag A1 and the second bag is eliminated.

Therefore, the second bag does not follow the movement of the top bag A1.

Since the center of the shaft 11 is located outside the bag from the bar 14,
As the suction cup 16 continues to rotate, the mouth edge of the bag A1 is pulled out from the bottom of the bar 14.

Then, as shown in FIG. 3, the arm 15
It is supplied in the direction of the swinging rod 27 in a state where it is being swung around.

In other words, the bag A1 is supplied to the upper surface of the swing rod 27 upside down as shown by the imaginary line A2 due to centrifugal force.

In FIG. 1, the swinging rod 27 receives bags on its upper surface.
The bag is swung to the imaginary line position 27a while supporting the bag by air suction, and the bag is opened below the supply hopper 32.

In short, in FIG. 5, even if the middle of the uppermost bag is lifted up with a suction cup, the second bag is unlikely to follow suit.

This is because the weight of the second bag overcomes the differential pressure created between the top and bottom of the iron.

However, since the end of the bag is light, if you lift the end part with a suction cup as shown in the same figure, you cannot prevent the second bag from following.

Therefore, in the present application, a bar 14 is provided at the light end of the bag to prevent the light part from lifting first, and at the same time, after a slight delay, the table 10 is moved down as shown in FIG. This allows it to move downward and not follow the topmost bag.

It goes without saying that the mechanism for moving the table 10 downward and the mechanism for reversing the shaft 11 are not limited to the illustrated embodiment.

In the present invention, a bar 14 is used to hold the bag opening and a suction cup 16 is used to lift up the area near the bar to form a chevron-shaped gap under the uppermost bag to facilitate air inflow. Move 10 down to the top bag and 2
The suction cup 1 is designed to prevent uneven friction with the second bag.
Since the bag A attracted to the suction cup 6 is once relayed to the rocking rod 27 and further supplied to the packaging function section, the suction cup 1 is transferred from the shaft 11.
The radius up to 6 is smaller than the rotation radius of a direct bag feeding system as shown in FIG. 5, for example, and the bag lifting speed is correspondingly smaller than that of a system with a large rotation radius.

For this reason, the negative pressure values between the topmost bag and the second bag are also reduced, and the bar 14 suppresses lifting of the light end of the bag, and the table 10 is moved downward, so that each Since the formation of a negative pressure layer between the bags is avoided, it is possible to efficiently prevent the second bag from following the top bag without any reduction in packaging efficiency.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a view taken along the line II-II of the previous figure, Figs. It is an explanatory diagram of a conventional example. A...Bag, 10...Table, 11.
...Axis, 15...Arm, 16...
...Sucker, 18...Cheno, 27...
Swing rod, 32... Supply hopper

Claims (1)

[Scope of utility model registration request] A large number of bags A, A, stacked on the table 10.
An obstruction bar 14 is provided along the upper part of the mouth edge of the container bag A, while a shaft 11 is provided parallel to the bar 14 at a position outside the mouth edge of the container bag A. An arm 15 protrudes from the circumferential surface of the shaft so as to straddle the bar 14, and a suction cup 16 is disposed at the tip of the arm so as to face the mouth edge of the bag A inside the bar 14. A power transmission mechanism in which the suction cup 16 is fixed and inverted by a reversing mechanism that drives the shaft 11 between a position where the bag A is present and a position where the swing rod 27 is present, and the suction cup. When 16 lifts the bag, the table 1
A bag feeding device including a mechanism for moving the bag 0 downward away from the bar 14.