JP2012176499A - Paste application device for pasted bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paste application device for a pasted bag, capable of corresponding to change in dimension of a bag bottom for a short time, achieving cost reduction, reducing the number of defective products and thus improving production efficiency.SOLUTION: The paste application device for the pasted bag includes: a bag carrying device carrying a cylindrical body becoming the pasted bag parallel to the width direction of the cylindrical body with a closing prospective end part opened; a large number of paste discharge guns 2 of which tips of nozzles face the closing prospective end part and which have valves opening/closing paste supply passages to the nozzles; a bag detection device detecting that the cylindrical body reaches a position where the paste discharge guns 2 are installed; and a control device connected to the bag detection device and the paste discharge guns 2. The paste discharge guns 2 are arranged in two rows on both sides of a centerline c of the closing prospective end part respectively so as to come closer to the centerline c on one side in the carrying direction and gradually separate from the centerline c toward the other side. The control device receives a detection signal from the bag detection device to operate the paste discharge guns 2, and opens the valves of the necessary paste discharge guns 2 at timing set corresponding to the dimension of the closing prospective end part.

Description

  The present invention relates to a glue applicator for a glue bag having a glue discharge gun.

The glue pasting bag is formed by closing one or both of openings formed at both ends of the bag with an adhesive.
Conventionally, a gluing device having a gluing roller to which a gluing pad is replaceably used has been used for gluing a gluing bag (single-bottom bag and double-bottom bag) (see Patent Document 1).
In order to perform gluing with the gluing device described in Patent Document 1, a gluing pad suitable for the size of the bag width and bottom width is attached to the gluing roller, and the gluing pad is rotated at the same speed as the bag feeding speed, The glue was attached to the gluing pad via the relay roller, and the gluing pad was pressed against the bottom of the bag sent by the bottom folding drum, and the glue adhered to the gluing pad was transferred to the bag according to the shape of the gluing pad.

However, the gluing device using the gluing pad has the following drawbacks.
1. It was necessary to replace the gluing pad each time the size of the bag changed, and the labor and time required for replacement was wasted.
2. Many types of gluing pads had to be prepared according to the bag size, and the storage location and management effort of the gluing pads were also necessary, which was a factor in increasing costs.
3. Bags are usually multi-layer bags with uneven thickness, so uneven coating thickness tends to occur.
4. When the bag making speed is high, glue skipping occurs or the timing of the glue roller and the bag shifts. When the bag making speed is low, the glue is glued on the bottom folding roller or bag. Adhering to other places, it causes troubles such as an increase in defective products.
5. Since the glue solidifies when the gluing work is completed, it is necessary to clean the gluing pad, relay roller, and other peripheral parts after the work, resulting in an increase in cost.

Conventionally, a bag making method in which a paste material is applied to a bag using a paste material injection nozzle is also known (see Patent Document 2).
However, this method is a method of applying a glue material for attaching the mouth reinforcing paper to the inside of the bag, and is not a method of applying glue for closing the bag bottom, but according to the bag width and the bottom width. The glue could not be applied to the appropriate position on the bottom of the bag.

Japanese Patent Application Laid-Open No. 11-91009 JP 2004-249484 A

  The problem to be solved by the present invention is that no gluing pad, its storage location and management effort are required, it is possible to respond to changes in the bag width and bottom width in a short time, cost is low, and defective products are generated. An object of the present invention is to provide a glue bag paste applicator that reduces the number and improves production efficiency.

The paste application device for the glue bag of the present invention is a bag transport device that transports a cylindrical body that becomes a paste pasting bag in a state in which the planned closing end is opened and in parallel with the width direction of the cylindrical body, A plurality of glue discharge guns, each of which is arranged with the tip of the nozzle facing the planned closing end, and having a valve for opening and closing the glue supply path to the nozzle, and the cylindrical body in the area where the glue discharge gun is installed A bag detecting device for detecting that it has reached, and a control device connected to the bag detecting device and the glue discharge gun, wherein the plurality of glue discharge guns are arranged to be closed along the conveying direction of the cylindrical body. Are arranged in two rows that are closer to the center line of the planned closing end on one side in the conveying direction and gradually move away from the center line of the planned closing end toward the other side, The control device receives a detection signal from the bag detection device. Actuates said glue dispensing gun Te, opening the valve of the glue dispensing gun required at the timing set in advance according to the dimensions of the closure will end.
A cleaning apparatus comprising a plurality of holes that can be supplied and drained to the inside and into which the nozzle tip portions of the paste discharge guns can be inserted and removed on the peripheral surfaces of two rows of pipes corresponding to the rows of the paste discharge guns, It is good to provide between the installation position of the glue discharge gun and the position retracted from the glue discharge gun.

According to the first aspect of the present invention, there is no need for a gluing pad that matches the bottom size of the bag, so there is no need to replace the gluing pad each time the type of bag is changed. It is possible to cope with it, and not only the time and effort for replacement can be saved, but also the storage place for the gluing pad becomes unnecessary, and the cost required for the bottom sticking can be reduced.
In addition, it is not easily affected by the bag conveyance speed, and it is possible to prevent the occurrence of defective products due to glue skipping, dripping, etc., and contamination of peripheral devices, thereby improving production efficiency.
According to the second aspect of the present invention, since the tip of the nozzle of the glue discharge gun can be automatically cleaned after the glue application operation is completed, the labor required for cleaning can be saved.

[BRIEF DESCRIPTION OF THE DRAWINGS] It is a side view of the glue application | coating apparatus for glue bags which shows the Example of this invention. It is a block diagram which shows the relationship of each apparatus in the glue application | coating apparatus for glue bags which concerns on the Example of this invention. It is a top view of the gun support frame and glue discharge gun concerning the example of the present invention. It is a front view of the gun support frame and glue discharge gun concerning the example of the present invention. It is a top view at the time of completion | finish of the paste application | coating operation | work of the paste application | coating apparatus for glue bags which shows the Example of this invention. It is a front view at the time of nozzle cleaning of the glue applicator for glue bag bags which shows the Example of this invention. It is a perspective view of the glue discharge gun concerning the example of the present invention. It is a side view of the glue discharge gun and the presser plate concerning the example of the present invention. It is sectional drawing of the backup plate which concerns on the Example of this invention, a cylinder, a paste discharge gun, and a presser plate. FIG. 2 shows a paste-attached bag, in which (A) is a single-bottom bag, and (B) is a plan view of the double-bottom bag. It is a specific example of glue application, (A) shows the glue application pattern of the planned closing end, (B) is a diagram showing the opening and closing timing of the valve.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The paste bag glue applicator of the present invention is installed in a bottom gluing portion of a bag making machine that automatically manufactures a glue bag, and as shown in FIG. 1 and FIG. The cylindrical body a is disposed on the side of the bag transport apparatus 1 and in the side of the bag transport apparatus 1 that is transported in parallel with the width direction of the cylindrical body a with the planned closed end thereof open. A large number of glue discharge guns 2 that discharge glue toward the bag, a bag detection apparatus 3 that detects that the cylinder a conveyed by the bag conveyance apparatus 1 has reached the installation area of the glue discharge gun 2, and a bag detection apparatus 3 And a control device 4 connected to the glue discharge gun 2 and an input device 40 for inputting glue application setting conditions to the control device 4.

In the bag making machine that manufactures a single-bottom bag, as shown in FIG. 10 (a), the bottom portion b is formed at one end portion of the cylindrical body a, so that paste is discharged to the planned closing end portion that becomes the bottom portion b. A glue discharge gun 2 is installed on one side of the bag conveying device 1. On the other hand, in a bag making machine that manufactures both bottom bags, as shown in FIG. 10B, a bottom portion b is formed at one end portion of the cylindrical body a, and a mouth portion b ′ is formed at the other end portion. For this reason, glue discharge guns 2 that discharge glue to the planned closing end portions serving as the bottom portion b and the mouth portion b ′ are installed on both sides of the bag conveying device 1.
In addition, the cylinder a conveyed by the bag conveying device 1 has both side portions folded inward in the previous step to form ridges, and as shown in FIG. The portion is developed from a center line c (bottom opening line) along the transport direction, and an inner flap d and an outer flap e are formed on both sides of the center line c.

The bag conveying device 1 is composed of a bag feeding belt that sandwiches and moves a horizontally inclined cylinder a from above and below, and a scheduled closing end portion that becomes a bottom b or a mouth b ′ of the cylinder a is outside the bag conveying device 1. It is transported in a standing state.
Further, a speed detection device 6 that detects the transport speed of the bag transport device 1 is attached to the bag transport device 1. The speed detection device 6 is connected to the control device 4, and the conveyance speed detected by the speed detection device 6 is sent to the control device 4 and digitized (FIG. 2).

As shown in FIG. 7, each glue discharge gun 2 has a nozzle 9 whose tip is directed to the end of the cylinder a to be transported by the bag transport device 1 and a valve that opens and closes the glue supply path to the nozzle 9. 10 The glue discharge gun 2 is connected to the control device 4 via a signal line 5, and the glue discharge operation, glue discharge pressure, and opening / closing of the valve 10 of the glue discharge gun 2 are controlled by the control device 4.
1, 3, and 4, these glue discharge guns 2 are attached to the gun support frame 11, 2 on both sides of the center line c of the scheduled closing end portion that is transported by the bag transport device 1. Arranged in a row. The row of glue discharge guns 2 approaches the center line c on one side in the transport direction (in the example shown in the figure, downstream in the transport direction) and gradually increases toward the other side (upstream in the transport direction). It is inclined in a substantially C shape so as to move away from c.

In this embodiment, 24 glue discharge guns 2 are arranged in each row, and the distance between the closest glue discharge guns 2 on the most downstream side in the transport direction is about 101 mm. Further, the upper and lower rows of the glue discharge guns 2 are inclined at an attachment angle of 14 degrees with respect to the center line c, respectively, and the distance between the glue discharge guns 2 that are farthest upstream in the transport direction is about 430 mm.
In addition, the attachment angle of the upper and lower rows of the glue discharge gun 2 can be appropriately adjusted according to the type of the filling, the size of the glue sticking bag, the quality requirement accuracy, and the like.

As shown in FIGS. 2 and 7, the glue supply path of each glue discharge gun 2 is connected to the glue tank 13 via the glue supply pipe 7 and the pressure feed pump 12.
Further, the pressure pump 12 is connected to the control device 4 via the electropneumatic conversion device 8, and the control device 4 digitizes the conveyance speed of the bag conveyance device 1 detected by the speed detection device 6 and converts it into an electropneumatic signal as an electric signal. Send to device 8.
Since the output of the electropneumatic converter 8 is proportional to the conveying speed, the rotation speed of the pressure pump 12 controlled by the output of the electropneumatic converter 8 is also proportional to the conveying speed. Since the amount of glue supplied to is increased or decreased according to the transport speed, the paste discharge amount of the glue discharge gun 2 can be made constant regardless of the transport speed.

Normally, the conveying speed of the bag conveying device 1 and the amount of glue supplied by the pressure pump 12 gradually increase from the start of operation of the glue application device for glue bag bags, and after a certain period of time, at a constant speed and a certain amount. It changes and gradually decreases when the operation is stopped.
Further, the electropneumatic converter 8 is provided with an operation unit 80 for changing the resistance value. By operating the operation unit 80 to change the resistance value and changing the output of the electropneumatic converter 8, the paste is changed. It is also possible to increase or decrease the glue discharge amount of the discharge gun 2.

As shown in FIGS. 3 and 4, a slider 14 is mounted on the upper end portion of the gun support frame 11, and the slider 14 is parallel to the cylinder body a and perpendicular to the conveying direction of the bag conveying device 1. It comes to slide along.
The lower end portion of the gun support frame 11 is connected to a gun moving cylinder 16 that brings the gun support frame 11 into and out of contact with the bag transport device 1.
Accordingly, when the gun moving cylinder 16 is operated, the tip of the nozzle 9 of the glue discharge gun 2 is brought into contact with and separated from the planned closing end portion of the cylinder body a conveyed by the bag conveying device 1. The operation of the gun moving cylinder 16 is also controlled by the control device 4.

As shown in FIG. 9, a backup plate 17 that receives the tip of the nozzle 9 of the glue discharge gun 2 is installed on the outer side of the bag conveying device 1 via an inner flap d and an outer flap e at the planned closing end. .
Moreover, as shown in FIG. 8, between the two rows of glue discharge guns 2, a presser plate that presses the planned closing end portion from the outside is detachably installed. The upper and lower edges of the presser plate 18 are formed in a stepped shape so as to avoid the positions of the nozzles 9 of the glue discharge gun 2 arranged in a substantially C shape.
By receiving the tip of the nozzle 9 with the backup plate 17 in this way, the paste is surely applied to the planned closing end, and by pressing the planned closing end with the presser plate 18, the paste is evenly distributed even if there is unevenness. Can be applied.

As shown in FIGS. 1 and 5, a cleaning device 19 for cleaning the tip of the nozzle 9 is provided slightly inside the position where the tip of the nozzle 9 of the glue discharge gun 2 is farthest from the bag transport device 1.
Corresponding to the row of glue discharge guns 2, the cleaning device 19 approaches the center line c on one side in the transport direction, and gradually moves away from the center line c toward the other side. The brush rolls 21 are respectively installed inside and attached to the cleaning device support frame 26.
A water supply port 22 is provided at the upper end portion of the upper row pipe 20, and a drain port 23 is provided at the lower end portion of the lower row pipe 20, and the lower end portion of the upper row pipe 20 and the upper end portion of the lower row pipe 20 Are connected, and can be supplied and drained into the pipe 20 through the water supply port 22 and the drain port 23.

The water drained from the drain port 23 is collected in a tank (not shown), and after being repeatedly used several times, it is once collected by the water purifier, purified, and then supplied to the water feed port 22 again. .
Further, a hole 24 into which the tip of the nozzle 9 of each glue discharge gun 2 can be inserted and removed is formed in the peripheral surface of the pipe 20 (the peripheral surface opposite to the bag conveying device 1).
Further, a motor 25 is installed on the upper part of the cleaning device support frame 26, and the output shaft of the motor 25 is connected to the upper end of the brush roll 21 in the upper row. An upper sprocket 28 is attached to the end of the output shaft of the motor 25, and a lower sprocket 29 is provided at the lower end of the brush roll 21 in the lower row. The upper sprocket 28 and the lower sprocket 29 are connected by a roller chain 30. It is connected. Therefore, when the motor 25 is operated, the upper and lower brush rolls 21 are rotated.

A cleaning device moving cylinder 27 is connected to the cleaning device support frame 26, and when the cleaning device moving cylinder 27 is operated, the cleaning device 19 is arranged in parallel with the transport direction of the bag transport device 1 and the installation position of the glue discharge gun 2. It moves between a position retracted from the glue discharge gun 2 to one side in the transport direction (in the present embodiment, upstream in the transport direction).
Therefore, after the gun support frame 11 is moved away from the bag transport device 1 until the tip of the nozzle 9 of the glue discharge gun 2 is retracted most, the cleaning device support frame 26 in the retracted position is moved downstream in the transport direction, The cleaning device 19 is aligned with the inside of the glue discharge gun 2, and then the gun support frame 11 is brought slightly closer to the bag transport device 1.
Then, as shown in FIG. 6, the tip of the nozzle 9 of the glue discharge gun 2 is inserted into the pipe 20 through the hole 24. In this state, when water is supplied to the inside of the pipe 20 at high pressure and the brush roll 21 is rotated, the tip of the nozzle 9 is cleaned cleanly.
On the other hand, when cleaning is completed, the glue discharge gun 2 is slightly retracted, the nozzle 9 is removed from the hole 24 of the pipe 20, and then the cleaning device 19 is moved to the upstream side in the conveying direction. Can be brought close to the bag conveying device 1.

The glue bag paste applicator of this embodiment operates as follows.
The size of each part of the paste bag is determined by the product specification table, and the size of each part of the paste bag also defines the paste application pattern at the scheduled end.
For example, at the planned closing end shown in FIG. 11A, the outer flap e has three rows of glue application portions g formed in parallel to the center line c on the outer side of the fold line f, and on the inner flap d. Are formed on the outer side of the fold line f ′ with one row of glue application portions g parallel to the center line c, and on the inner side with two rows of glue application portions g.

In accordance with the glue application pattern, the input device 40 is used to input the glue discharge gun 2 necessary for glue application and the timing for opening the nozzle 9 to the control device 4. Further, the timing of the discharge operation (gun strike) of the glue discharge gun 2 is input to the control device 4 to adjust the length of discharge time and the discharge interval.
In order to form the glue application part g as shown in FIG. 11 (a), in the upper row, three glue discharge guns 2 located at distances y1, y2, and y3 from the center line c, and in the lower row, Three glue discharge guns 2 at the distances Y′1, Y′2, and Y′3 from the center line c are required.

Then, as shown in FIG. 11B, the valve 10 of the glue discharge gun 2 located at the lowermost y1 in the upper row is sequentially closed at x1, opened at x2, and closed at x3 from the bag detection time point s. Open at x4 and close at x5.
Further, the valve 10 of the glue discharge gun 2 located in the upper row y2 is sequentially closed at x21 from the bag detection time s, opened at x22, closed at x23, opened at x24, and closed at x25.
The valve 10 of the glue discharge gun 2 located at the uppermost y3 in the upper row is sequentially closed at x31, opened at x33, and closed at x34 from the bag detection time s.

The valve 10 of the glue discharge gun 2 located at the uppermost Y′1 in the lower row is sequentially closed at X′1, opened at X′2, and closed at X′3 from the bag detection time s.
Further, the valve 10 of the glue discharge gun 2 located in the lower row Y′2 is sequentially closed at X′21, opened at X′22, and closed at X′23 from the bag detection time s.
Further, the valve 10 of the glue discharge gun 2 located at the lowermost Y′3 in the lower row is sequentially closed at X′31, opened at X′32, and closed at X′33 from the bag detection time s.

Before starting the glue application work, the control device 4 brings the glue discharge gun 2 close to the bag conveying device 1 and supplies the glue in the glue tank 13 to the glue discharge gun 2 by the pressure feed pump 12.
When the bag detection device 3 detects that the cylindrical body a conveyed by the bag conveyance device 1 has reached the installation position of the glue discharge gun 2, the control device 4 receives the detection signal from the bag detection device 3 and sets it. The operation of the glue discharge gun 2 is started as it is.
All the glue discharge guns 2 perform the discharge operation at a preset timing, but open only when the valve 10 of the set glue discharge gun 2 is set. Accordingly, only the glue discharge gun 2 with the valve 10 opened actually discharges the glue toward the scheduled closing end, and the glue application part g is formed according to the pattern set at the scheduled closing end.

At this time, as shown in FIG. 9, the scheduled closing end of the cylindrical body a is supported by the backup plate 17 from the inside and is held by the holding plate 18 from the outside and is reliably conveyed in an upright state.
In addition, a slight gap is formed between the tip of the nozzle 9 of the glue discharge gun 2 and the planned closing end due to the pressing by the presser plate 18, and the projected closing end with unevenness made of multilayer paper is used. Since even the portion becomes flat, the paste can be applied uniformly and stably.

Note that the setting input to the control device 4 is appropriately corrected according to the result of applying paste to the planned closing end on a trial basis. Then, after the correction, the determined setting is stored in the control device 4 together with the number, and when the next product is glued, only by inputting the number without re-setting, the setting is stored. Can be glued.
Further, when the amount of paste discharged by the paste discharge gun 2 is small, the nozzle 9 is replaced with one having a large diameter, and when the amount of paste discharged is large, the nozzle 9 is replaced with one having a small diameter.
Further, during the glue application operation, the glue discharge pressure of the glue discharge gun 2 can be controlled by increasing or decreasing the amount of glue supplied to the glue discharge gun 2 in accordance with the conveyance speed of the bag conveying device 1.
In this way, by changing the diameter of the nozzle 9 and the discharge pressure of the paste discharge gun 2, the amount of paste applied can be adjusted according to the quality of the paste and the room temperature.

When the glue application operation is completed, the control device 4 operates the gun moving cylinder 16 by switching to the cleaning mode, and moves the glue discharge gun 2 away from the bag conveying device 1.
Next, the control device 4 operates the cleaning device moving cylinder 27 to move the cleaning device 19 so that the hole 24 of the pipe 20 is aligned with the inside of the tip of the nozzle 9 of the glue discharge gun 2.
Thereafter, the control device 4 moves the glue discharge gun 2 slightly inward, inserts the tip end portion of the nozzle 9 into the pipe 20 through the hole 24, and then supplies water into the pipe 20 to rotate the brush roll 21. .
When the cleaning of the nozzle 9 is completed, the control device 4 drains the dirty water in the pipe 20, moves the glue discharge gun 2 slightly outward and pulls out the tip of the nozzle 9 from the hole 24, and further the cleaning device 19 is returned to the position retracted from the movement path of the glue discharge gun 2.

In the above embodiment, the tip of the nozzle 9 is cleaned using the brush roll 21, but the nozzle 9 of the glue discharge gun 2 coated with glue that is easily dissolved in water, such as starch glue, It is only necessary to wash with water or hot water without using the roll 21.
When the mounting angle of the upper and lower rows of the glue discharge gun 2 is changed, the pipe 20 of the cleaning device 19 and the presser plate 18 are exchanged to match the mounting angle.

a cylinder b bottom c center line d inner flap e outer flap f, f 'wrap line g glue application part 1 bag transport device 2 glue discharge gun 3 bag detection device 4 control device 5 signal line 6 speed detection device 7 glue supply pipe 8 Electro-Pneumatic Converter 9 Nozzle 10 Valve 11 Gun Support Frame 12 Pressure Pump 13 Glue Tank 14 Slider 15 Guide Shaft 16 Gun Moving Cylinder 17 Backup Plate 18 Presser Plate 19 Cleaning Device 20 Pipe 21 Brush Roll 22 Water Supply Port 23 Drainage Port 24 Hole 25 Motor 26 Cleaning device support frame 27 Cleaning device moving cylinder 28 Upper sprocket 29 Lower sprocket 30 Roller chain 40 Input device 80 Operation unit

Claims (2)

  A bag transporting device that transports the cylindrical body that becomes the paste paste bag in a state in which the planned closing end is opened and in parallel with the width direction of the cylindrical body, and the tip of each nozzle is directed to the planned closing end. A plurality of glue discharge guns having a valve for opening and closing the glue supply path to the nozzle, and a bag detecting device for detecting that the cylindrical body has reached an installation area of the glue discharge gun, A plurality of glue discharge guns on both sides of the center line of the planned closing end along the conveyance path of the cylindrical body, and one side in the conveyance direction. The control device is arranged in two rows that approach the center line of the planned closing end portion and gradually move away from the central line of the planned closing end portion toward the other side, and the control device outputs a detection signal from the bag detecting device. In response to actuate the glue discharge gun, Noribari bag paste application apparatus characterized by opening the valve of the glue dispensing gun required at the timing set in advance according to the dimensions of the closed scheduled end.   A cleaning apparatus comprising a plurality of holes that can be supplied and drained to the inside and into which the nozzle tip portions of the paste discharge guns can be inserted and removed on the peripheral surfaces of two rows of pipes corresponding to the rows of the paste discharge guns, The glue application device for a glue bag according to claim 1, wherein the glue application device is provided so as to be movable between an installation position of the glue discharge gun and a position retracted from the glue discharge gun.

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