JP3968105B2 - Square bottom paper bag stacking device - Google Patents

Description

  The present invention relates to a stacking device for a square bottom paper bag in which a number of folded square bottom paper bags are gathered together in an appropriate number, and the top and bottom are alternately switched.

Folded square-bottom paper bags have thicker corners than other parts, so if you stack a large number of them in the same direction, the shape becomes indeterminate, and if you wrap them, they become unstable. Inconvenient to transport and store.
Therefore, as a device for alternately stacking the bottoms of the squares in the opposite direction and reducing the thickness of the stacks to make them uniform, the lots of bags are scooped when the square bottom paper bags collected in the holding mechanism reach a certain amount. There is known a transfer device to a square-bottom paper bag packaging device that sequentially and alternately turns 90 ° of the bag lot carried out and receives the bag lot alternately turned in the opposite direction and transfers it to the packaging process. (See Patent Document 1).
However, the conventional transfer device does not consider any means for efficiently stacking the transported square bottom paper bags by a predetermined number and transporting the predetermined number of square bottom paper bags toward the take-out position.

Japanese Patent Publication No. 58-24331

  The problem to be solved by the present invention is to provide a stacking device for square bottom paper bags that can be stacked automatically and efficiently by exchanging a predetermined number of square bottom paper bags up and down and easy to take out for each batch. .

  The stacking device for square bottom paper bags of the present invention has a bottom plate, a bag stacking portion having an open top surface, a lifting plate installed in a central portion of the bottom plate of the bag stacking portion, and both sides of the lifting plate. And a bag support portion that rises in the bag accumulation portion and descends and circulates outside the bag accumulation portion, and a first bag supply portion that faces the front portion of the bag accumulation portion, The second bag supply unit, which is disposed above the first bag supply unit and faces the rear of the bag accumulation unit, and the first bag supply unit and the second bag supply unit. A bag conveying device that alternately conveys a predetermined number of bottom paper bags, and the first bag supply unit supplies the square bottom paper bags to the bottom plate and the lifting plate with the bottom of the bag facing rearward. The elevating plate is raised after a predetermined number of square bottom paper bags are supplied from the first bag supply unit, and is accumulated on the bottom plate. While pushing up the paper bag, the square bottom paper bag is lowered after being transferred to the bag support portion that has been lifted from below, and the second bag supply portion is placed on the square bottom paper bag supported by the bag support portion, The square bottom paper bag is supplied and accumulated with the bottom of the bag facing forward, and the bag support unit is configured to supply the square bottom paper bag supported after a predetermined number of square bottom paper bags are supplied from the second bag supply unit. It moves toward the upper surface of the deposition part.

A plurality of pairs of the bag support portions may be installed at appropriate intervals along the circulation path.
A defective bag detection device is installed in the middle of the bag conveying device upstream of the branching portion to the first bag supply unit and to the second bag supply unit, and the defect detected by the defective bag detection device Bags can also be excluded from the bag transport device.

According to the first aspect of the present invention, the folded square bottom paper bags can be automatically stacked by a predetermined number so as not to incline with a constant thickness, and the square bottom paper bags are stacked on the bag accumulation portion. In the meantime, the stacked square-bottom paper bags are transferred toward the opening above the bag stacking section, and the supply of the square-bottom paper bags to the bag stacking section is stopped while the stacked square-bottom paper bags are being taken out. Since it is not necessary, the working efficiency is very good and the bag can be easily taken out from the bag accumulation portion.
According to the second aspect of the present invention, since a plurality of batches of stacked bottom paper bags are successively transferred from the deposition position to the take-out position, they can be stacked more efficiently and at high speed.
According to the invention which concerns on Claim 3, a defective bag can be popped out and only a normal square bottom paper bag can be stacked on a bag accumulation part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The stacking device for square bottom paper bags of the present invention is installed between a bag making machine and a bag packaging device, and stacks the folded square bottom paper bags A discharged from the bag making machine upside down by a predetermined number. As shown in FIGS. 1 to 3, the bag stacking portion 1 having a bottom plate 2 and having an open top surface, and the lifting plate 3 installed so as to be movable up and down at the center of the bottom plate 2 of the bag stacking portion 1. A plurality of pairs of bag support portions 4 installed on both sides of the lifting plate 3, a first bag supply portion 5 installed facing the front portion of the bag accumulation portion 1, and a first bag supply portion 5 In the upper part, a predetermined number of square bottom paper bags are provided to the second bag supply unit 6 installed facing the rear part of the bag stacking unit 1, and the first bag supply unit 5 and the second bag supply unit 6. And a bag transport device 7 for alternately transporting them one by one.

A front wall 8, a rear wall 9, and left and right guide plates 10 are erected around the bag stacking portion 1, and the cross section of the bag stacking portion 1 is formed to be slightly larger than the shape of the folded square bottom paper bag A. ing. The guide plate 10 is composed of a vertically long plate body having a narrow width, and stands at the center in the front-rear direction, and the bag accumulation portion 1 is open on both sides thereof.
As shown in FIG. 4, near the lower portion of the front wall 8, a first bag supply port 11 for feeding the square bottom paper bag A into the bag stacking unit 1 is opened. A first buffer plate 12 for receiving the square bottom paper bag A is installed. A second bag supply unit 11 ′ is opened in the rear wall 9 above the first bag supply unit 11 and the first buffer plate 12.
Further, as shown in FIG. 3, a bag take-out device 13 for taking out the stacked square bottom paper bags A is installed above the bag stacking unit 1.

A central portion in the width direction of the bottom plate 2 of the bag accumulation portion 1 is opened along the front-rear direction, and the elevating plate 3 is disposed in this opening portion.
An air cylinder 14 is connected to the lower surface of the elevating plate 3, and by operating the air cylinder 14, it is moved up and down between the level of the bottom plate 2 and the height of the first bag supply port 11. It has become.

The bag support portion 4 is made of a bar material that is slightly shorter than the front and rear dimensions of the bag accumulation portion 1, and is horizontally laid between arms 16 that project from the chains 15 that are respectively installed on the front and rear sides of the bag accumulation portion 1. Yes. A plurality of pairs of bag support portions 4 are provided at regular intervals in the length direction of the chain 15 so that the bag support portions 4 on both sides face each other.
The chain 15 is wound around sprockets 17 and 17 'installed near the upper part and the lower part of the bag accumulation part 1, and when the chain 15 is driven, the bag support part 4 rises in the bag accumulation part 1, It descends outside the bag accumulation part 1 and circulates while stopping intermittently.

As shown in FIGS. 1 and 2, the first bag supply unit 5 includes upper and lower delivery rollers 18 disposed close to the upper and lower portions of the first bag supply port 11 on the outer surface of the front wall 8. 18 'and is sent out into the bag accumulation part 1 from the 1st bag supply port 11 across the folded square bottom paper bag A.
The second bag supply unit 6 is composed of upper and lower delivery rollers 19 and 19 ′ which are installed close to the upper and lower portions of the second bag supply port 11 ′ on the outer surface of the rear wall 9 and folded. The square bottom paper bag A is sandwiched and sent out from the second bag supply port 11 ′ into the bag stacking unit 1.

The bag conveying device 7 is arranged from the bag making machine to the bag accumulation unit 1, and the downstream side of the branch portion provided in front of the bag accumulation unit 1 goes straight to reach the first bag supply unit 5. It is branched into a lower supply path 21 and an upper supply path 22 that is folded once and reaches the second bag supply unit 6.
Further, on the upstream side of the branch portion, a defective bag detection device (not shown) is installed in the middle of the bag transport device 7, and a defective bag discharge portion 23 is installed below the branch portion.
Further, a distribution device 24 that distributes the square bottom paper bag A to the lower supply path 21 and the upper supply path 22 is installed at the branch portion.

Each path of the bag conveying device 7 includes a belt 26 guided by a number of guide rollers 25 and transported with the folded square bottom paper bag A interposed therebetween.
The belts 26 and 26 ′ constituting the lower supply path 21 circulate through the feed rollers 18 and 18 ′ constituting the first bag supply unit 5, respectively, and the belts 26 and 26 ′ constituting the upper supply path 22 are circulated. 26 'circulates through delivery rollers 19 and 19' constituting the second bag supply unit 6, respectively.
The lower supply path 21 and the upper supply path 22 are each provided with a counting device that measures the number of square bottom paper bags A that have passed through.

As shown in FIG. 5, the sorting device 24 includes a first swing plate 27 that is disposed below the lower supply path 21, and a second swing plate 28 that is disposed below the first swing plate 27. With.
The first swing plate 27 is connected to the air cylinder 30 via the first link member 29, and the second swing plate 28 is connected to the air cylinder 32 via the second link member 31, and the air cylinders 30, 32 are connected to each other. By operating, the first swing plate 27 and the second swing plate 28 swing. In addition, a bag pressing plate 33 is installed facing the second swing plate 28.

When the tip of the first swing plate 27 swings downward, the lower supply path 21 opens, and when swings upward, the lower supply path 21 closes.
Further, the first swing plate 27 and the second swing plate 28 are connected to the upper supply path 22 through the lower part of the bag pressing plate 33, and the upper supply is provided when the second swing plate 28 stands up. When the path 22 is closed and the second swing plate 28 is tilted, the upper supply path 22 is opened. Furthermore, when the second swing plate 28 stands up, a path to reach the defective bag discharge portion 23 is opened, and when the second swing plate 28 falls down, this path is closed.

At the beginning of stacking by the bag accumulation device, the elevating plate 3 is lowered and is flush with the bottom plate 2 of the bag accumulation unit 1. Further, the tip of the first swing plate 27 of the sorting device 24 swings downward, and the lower supply path 21 is open.
The square bottom paper bag A manufactured by the bag making machine is conveyed in the direction of the bag accumulating device by the bag conveying device 7 in a folded state with the square bottom facing upward and the bag bottom facing the downstream side.
When a defective bag is not detected by the defective bag detection device, the conveyed square bottom paper bag A advances straight as it is, reaches the first bag supply unit 5 through the lower supply path 21, and the first bag supply port 11. To the bag accumulation part 1.

The square bottom paper bag A sent into the bag stacking unit 1 falls on the bottom plate 2 and the lifting plate 3 with the bottom of the bag hitting the first buffer plate 12. The dropped square bottom paper bag A is deposited with the bottom of the bag facing the rear wall 9 and the square bottom of the bag.
When the number of square bottom paper bags A passing through the lower supply path 21 reaches a predetermined number (for example, 25 sheets), the elevating plate 3 ascends and lifts the accumulated 25 square bottom paper bags A.
Then, the bag support portion 4 driven by the chain 15 rises from below, and supports the lower portions on both sides of the accumulated square bottom paper bag A and transports it upward. The bag support unit 4 lifts and stops the accumulated square bottom paper bag.

At this time, the upper surface of the accumulated square bottom paper bag A is at a position lower than the second bag supply port 11 ′, and the height difference is set to be slightly larger than the height of the predetermined number of stacked square bottom paper bags A. . Further, the bag support portion 4 that supports the accumulated square bottom paper bag A is positioned above the first bag supply port 11.
The lifting plate 3 lowers to the original position after delivering the raised square bottom paper bag A to the bag support 4.

Further, when a predetermined number of square bottom paper bags A pass through the lower supply path 21, the sorting device 24 is switched, the tip of the first swing plate 27 is raised, the lower supply path 21 is closed, and the upper supply path 22. Opens.
The square bottom paper bag A that has passed through the upper supply path 22 reaches the second bag supply unit 6 with the bottom of the bag facing downward and the downstream side toward the downstream side, and reaches the second bag supply port 6 from the second bag supply port 11 ′. It is sent out into the accumulation part 1.
The square bottom paper bags A fed into the bag stacking unit 1 are stacked on the square bottom paper bags A supported by the bag support unit 4.

Since the upper supply path 22 is folded back, the square bottom paper bag A supplied from the second bag supply unit 6 is deposited with the bag bottom facing the front wall 8 and the square bottom facing down.
When the number of square bottom paper bags A that have passed through the upper supply path 22 reaches a predetermined number (25 sheets), the sorting device 24 is switched again, the upper supply path 22 is closed, and the lower supply path 21 is opened to supply the first bag. A square bottom paper bag A is supplied from the part 5 onto the bottom plate 2 and the lifting plate 3.
At this time, above the first bag supply port 11, 25 square-bottom paper bags A are supported by the bag support unit 4 in a state where a total of 50 sheets are stacked upside down.

Then, when 25 square bottom paper bags A are deposited on the bottom plate 2 and the lifting plate 3, the lifting plate 3 is raised and the bag support portion 4 is raised in the bag accumulation portion 1, so that one batch of 50 sheets. The square bottom paper bags A supported by the bag support portion 4 in the stacked state also rise toward the opened upper surface of the bag accumulation portion 1.
This process is repeated in sequence, and when the square bottom paper bag A supported by the bag support unit 4 reaches the upper end of the bag stacking unit 1, the bag take-out device 13 holds the batch of square bottom paper bags A and It is conveyed toward the bag packaging device through the upper part.

When a defective bag is detected by a defective bag detection device installed in the middle of the bag conveying device 7, the second swing plate 28 of the sorting device 24 rises and the tip of the first swing plate 27 Swinging upward, both the lower supply path 21 and the upper supply path 22 are closed, and the defective bag is discharged to the defective bag discharge portion 23. Accordingly, the defective bag is not sent into the bag accumulation portion 1.
Further, in the present embodiment, the bag take-out device 13 transfers the square bottom paper bag A to the front of the bag accumulation unit 1, but it can be taken out behind the bag accumulation unit 1 depending on the arrangement order of the devices.
Further, the detailed structures of the bag transport device 7, the defective bag discharge unit 23, the drive mechanism of the bag support unit 4, the defective bag discharge unit 23, etc. are not limited to those shown in the drawings, and can be appropriately replaced as long as they have similar functions. can do.

The principal part sectional view seen from the side of the accumulation device of the square bottom paper bag which shows the example of the present invention. The side view of the deposition apparatus of the square bottom paper bag which shows the Example of this invention. Sectional drawing seen from the back of the deposition apparatus of the square bottom paper bag which shows the Example of this invention. The principal part expanded sectional view of the deposition apparatus of the square bottom paper bag which shows the Example of this invention. The side view of a distribution apparatus.

Explanation of symbols

A square bottom paper bag 1 bag accumulation part 2 bottom plate 3 elevating plate 4 bag support part 5 first bag supply part 6 second bag supply part 7 bag transport device 8 front wall 9 rear wall 10 guide plate 11 first bag supply Port 11 'Second bag supply port 12 First buffer plate 13 Bag take-out device 14 Air cylinder 15 Chain 16 Arm 17, 17' Sprocket 18, 18 'Delivery roller 19, 19' Delivery roller 21 Lower supply path 22 Upper supply Path 23 Defective bag discharge portion 24 Sorting device 25 Guide roller 26, 26 'Belt 27 First swing plate 28 Second swing plate 29 First link 30 Air cylinder 31 Second link 32 Air cylinder 33 Bag presser plate

Claims (3)

  A bag stacking portion having a bottom plate and having an open top surface, a lifting plate installed at the center of the bottom plate of the bag stacking portion, and a lifting plate installed on both sides of the lifting plate, and rising in the bag stacking portion And a bag support portion that descends and circulates outside the bag accumulation portion, a first bag supply portion that is installed facing the front portion of the bag accumulation portion, and above the first bag supply portion. A second bag supply unit installed facing the rear of the bag stacking unit, and a bag that alternately conveys a predetermined number of square bottom paper bags to the first bag supply unit and the second bag supply unit. The first bag supply unit is configured to supply and stack the square bottom paper bag on the bottom plate and the lifting plate with the bottom of the bag facing rearward. After a predetermined number of square-bottom paper bags are supplied from the bag supply unit, it rises and pushes up the square-bottom paper bags deposited on the bottom plate. The second bag supply unit descends after delivering the bottom paper bag to the bag support portion that has been lifted from below, and the second bag supply unit places the square bottom paper bag on the bottom of the square bottom paper bag supported by the bag support portion. The bag support unit is configured to supply the square bottom paper bag toward the upper surface of the bag accumulation unit after a predetermined number of square bottom paper bags are supplied from the second bag supply unit. A square-bottom paper bag stacking device characterized by transporting.   2. The square bottom paper bag stacking device according to claim 1, wherein a plurality of pairs of the bag support portions are installed at appropriate intervals along the circulation path. A defective bag detection device is installed in the middle of the bag conveying device upstream of the branching portion to the first bag supply unit and to the second bag supply unit, and the defect detected by the defective bag detection device 3. The square bottom paper bag stacking device according to claim 1, wherein the bag is excluded from the bag conveying device.

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