JP2002301780A - Sheet bag making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain good-quality paper bags which are free from such a trouble that the part attached by an adhesive is not easily released, even when a synthetic paper is used as a material sheet. SOLUTION: This sheet bag making machine is structured of a sheet supply part 1 which supplies material sheets one by one, a barrel forming part 3 which forms the sheets into flat and barrel-like bodies with both gusseted sides while running the material sheets supplied by the part 1 and an angular bottom forming part 4 which forms a square bottom face at one end opening of the barrel-like body obtained by the barrel forming part 3. In the machine, a pasting part 3A for bonding both edges of the material sheet is provided at the barrel forming part 3. Especially, at the pasting part 3A, a nozzle 5 which discharges an adhesive to one edge of the material sheet and an ascending/descending contactor 12 which spreads the adhesive discharged from the nozzle 5 like a belt along one edge of the material sheet are provided. Thus, both edges of the sheet can be firmly bonded instantaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a paper bag used as a shopping bag or the like, and more particularly, to a single sheet capable of strongly adhering a body of a paper bag with an adhesive so as not to peel off. It relates to a bag making machine.

[0002]

2. Description of the Related Art Generally, a paper bag as shown in FIG. 10 is widely used as a shopping bag or the like. Here, A is a square cylindrical body, B is opening for loading and unloading the article, C is the bottom surface of the rectangular shape opposing the opening, both side surfaces A ₁ forming the body A is a when not in use The gusset is folded so that it can be folded flat.

[0003] Although such paper bags are sometimes handmade, many of them are made continuously by a device called a sheet-fed bag making machine. A sheet-feeding bag making machine is generally a sheet feeding unit that feeds out stencils stacked in a multilayer form one by one, and a flat tube whose both sides are gusset-folded while running the stencil fed out from the sheet feeding unit in a predetermined direction. It comprises a body forming part for forming a body, and a square bottom forming part for closing an opening at one end of the cylindrical body obtained by the body forming part as a rectangular bottom surface. In particular, a glued portion for bonding both edges of the base paper is provided in the body forming portion, and a glue (adhesive) is applied to one end edge of the base paper in advance at the glued portion before gusset folding the base paper. It has become. Then, according to the above-described sheet-fed bag making machine, after the cylindrical body S as shown in FIG. 11 is formed by the body forming section, one end opening thereof is folded by the square bottom forming section, as shown in FIG. The bottom surface C can be formed continuously.

[0004]

However, according to the conventional sheet-fed bag making machine, a nozzle is provided as a gluing section in the body forming section, and an adhesive is applied to one end edge of the running base paper from the nozzle. When the bottom is formed at one end of the cylindrical body at the square bottom forming portion, the adhesive is not provided at the bent portion L as shown in FIG. In some cases, the bonded part was peeled off. In particular, when the base paper is made of synthetic polymer synthetic paper such as polypropylene or polyolefin, a synthetic resin-based adhesive that is compatible with synthetic paper is used as the adhesive. If there is, much of the solvent remains without volatilization until both edges of the base paper are brought into contact with each other, so that immediate bonding is impossible. In most cases, a hole caused by poor bonding at the position of the bent portion L in most of the finished paper bag. h.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a high-quality paper bag in which a portion bonded by an adhesive cannot be easily peeled off even when synthetic paper is used as a base paper. Is to be able to

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a paper feeding section for feeding base paper one by one, and a body forming section for forming a flat cylindrical body from the base paper fed from the paper feeding section. In the sheet-fed bag making machine, the body forming portion has a glued portion for bonding both end edges of the base paper,
A nozzle that has the glued portion on one edge of the base paper and discharges the adhesive onto the paper surface; and a contact that extends the adhesive discharged from the nozzle in a band along the one edge of the base paper. Provided is a single-wafer bag making machine characterized by the following.

[0007] In particular, as a more preferable aspect, the present invention provides a sheet feeding section for feeding the base paper one by one, and a flat tubular body whose both sides are gusset-folded while running the base paper fed from the sheet feeding section. A sheet forming machine comprising: a body forming section to be formed; and a square bottom forming section that forms a square bottom surface at one end opening of the cylindrical body obtained by the body forming section. A gluing portion for bonding both edges of the base paper, the gluing portion is located on one edge of the base paper, and a nozzle for discharging the adhesive onto the paper surface, and the adhesive discharged from the nozzle is used for the base paper. And a vertically movable contact for extending in a strip shape along one edge of the base paper, and the glued portion is arranged such that when the base paper passes below the contact, the contact is directed toward one end of the base paper. A sheet-fed bag making machine characterized by being provided with operating means for lowering. It is intended to.

The operating means uses a cam roller, which rotates at a predetermined speed by receiving power from a driving unit for running the base paper, as a motor node, and rotates the rotary shaft about its axis so as to swing the contact up and down. And a swing link extending from the driven shaft toward the outer peripheral cam contour surface of the cam roller so as to impart a rotational angular motion to the driven shaft, and to fix a contact to the driven shaft. Is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a schematic side view showing an overall image of a sheet-fed bag making machine, and FIG. 2 is a schematic plan view thereof. In these figures, 1 is a paper feeding section for feeding out the base paper P one sheet at a time, 2 is a crease section for forming a crease along the running direction on the base paper fed from the paper feeding section, and 3 is a section passing through the crease section. A body forming section that forms a flat cylindrical body whose both sides are gusset-folded while running the base paper in a predetermined direction, and 4 is a square base that forms an opening at one end of the cylindrical body obtained by the body forming section with a rectangular bottom surface. The parts 1 to 4 are formed in series, and one base paper P can be finally formed into a paper bag as shown in FIG.

The body forming section 3 includes a primary folding section 3B and a secondary folding section 3C for gusset folding, and the upstream side of the primary folding section 3B is provided with both ends of a base paper for bonding. Glue part 3A that glues one end edge in advance
Is provided.

FIG. 3 is a schematic perspective view showing the glued portion 3A. As is clear from this figure, the gluing section 3A has a nozzle 5 which is on one end edge e of the base paper P and discharges the glue (adhesive f) onto the paper surface. The nozzle 5 is connected to a cylinder head 6 for storing the adhesive, and the cylinder head 6 is connected to a pipe 7 for supplying the adhesive. An air supply valve 8 is attached to the cylinder head 6, and two air hoses 9 and 10 are connected to the air supply valve 8. Reference numeral 11 denotes a holder for arranging the nozzle 5 on one edge e of the base paper. The cylinder head 6 is bolted to the holder 11. Then, according to the nozzle 5 connected to the cylinder head 6, the adhesive f is discharged in a streak form onto the one end edge paper surface of the base paper P passing below with the front end facing the one end edge e of the base paper. The ejection of the adhesive by the nozzle 5 is performed as follows.
It is formed by the pressure of the working fluid (compressed air) flowing into the air supply valve 8 from the air hoses 9 and 10. By setting the operation time, the discharge time of the adhesive is set to the length of the base paper and the traveling speed (feed speed). It can be easily changed to suit.

On the other hand, the gluing section 3A is provided with the nozzle 5 as described above.
In addition, a contact 12 for extending the adhesive f discharged from the nozzle 5 in a band along one edge e of the base paper, and the contact 12 when the base paper passes below the one end e of the base paper And operation means 13 for descending toward. In the present embodiment, the contact 12 is a moat-shaped member made of a metal plate or the like, and is located behind the nozzle 5 (downstream in the direction of travel of the base paper) and on the same straight line as the nozzle 5 through which one edge e of the base paper passes It is provided so as to be able to move up and down. Reference numeral 14 denotes a driven shaft that holds the contact as operating means for raising and lowering the contact,
One end of the driven shaft 14 is rotatably supported by a bearing of a bracket (not shown) provided on the apparatus frame in a direction orthogonal to the traveling direction of the base paper. Then, the driven shaft 14 obtains power from a driving joint, which will be described later, performs a rotational angular movement about the axis, and swings the contact 12 mounted on the coaxial 14 up and down. The driven shaft 14 has the contact 1
A mounting portion 15 for fixing the second contact 2 is provided, and one end of the contact 12 is bolted to the mounting portion 15. Reference numeral 16 denotes a swing link provided at one end of the driven shaft for transmitting the power of the motor to the driven shaft 14, and the swing link 16 has one end fixed to the driven shaft 14 and Is provided with a guide roller 17 which comes into contact with a portion of a motor joint.

In FIG. 4, reference numeral 18 denotes a cam roller serving as a driving joint for imparting a rotational angular motion to the driven shaft 14. The outer periphery of the cam roller 18 is a cam contour surface having a circumferential portion 19 and a concave portion 20. The end guide roller 17 of the swing link 16 comes into contact with the surface. In this embodiment, the cam roller 18 is formed by stacking a pair of flat cams 18A and 18B, one of which has screw holes 21 formed at a predetermined interval along the circumferential portion 19, and the other has screw holes 21. 2
An arc-shaped long hole 22 is formed corresponding to 1.

According to the cam roller 18, a pair of flat cams 18A and 18B can be integrally fastened by screwing a bolt from the long hole 22 into the screw hole 21, and particularly by changing the position of the screw hole 21. The occupation ratio between the circumferential portion 19 and the concave portion 20 can be adjusted. The cam roller 18 rotates at a predetermined speed by receiving power from a driving unit for moving the base paper in a predetermined direction. Reference numeral 23 denotes a transmission system for rotating the cam roller 18 at a constant speed. The transmission system 23 includes, for example, a sprocket 24 provided coaxially with the cam roller 18 and other sprockets 24, 25, 2 provided on the apparatus frame.
6, and a chain 28 connecting each of the sprockets,
29 and the like.

On the other hand, as shown in FIG. 5, the above-mentioned drive unit simultaneously drives a plurality of feed rollers 31 provided above and below a travel guide surface 30 and the respective feed rollers in order to run the base paper. 32 as a drive source for the
Etc. According to this example, the sprocket 33 attached to one of the axles supporting the feed roller 31 and the sprocket 27 of the transmission system 23 are connected to the chain 3.
4, the cam roller 18 rotates at a predetermined speed in synchronism with the sheet feeding timing, and rotates the driven shaft 14 about its axis through a swing link 16 which comes into contact with the outer peripheral cam contour surface. The rotational angular motion is caused.

As a result, the contact 12 swings up and down around the driven shaft 14 as shown in FIG. 6, and the tip of the contact comes into contact with one edge of the base paper P by swinging downward. The agent is spread in a belt shape, and the descent time can be set by adjusting the range of the circumferential portion 19 of the cam roller 18. Therefore, even when base papers having different lengths are used, the contact 12 can be kept in contact over the entire length of one end edge. As is apparent from FIG. 5, the nozzle 5 is connected to the tank 35 for storing the adhesive through the pipe 7.
And one ends of the air hoses 9 and 10 are connected to an air compressor 36.

Here, the operation of the above-described sheet-fed bag making machine will be described. The base paper P (synthetic paper mainly composed of polypropylene or the like in this example) is fed out one by one from the paper feed unit 1. along its sheet feed direction Sujizuke portion 2 to the base paper is folded muscle L ₁ ~L ₆ having Article 7 is applied. Origami L
As it is sent to the body forming portion 3, first with toluene as solvent in the synthesis resin adhesive f (this example which ejects from the nozzle 5 at one end edge e by sheet P is feed roller _{31 1} ~L ₆ is attached Normal hexane) is streaked. Next, when the advancing end of the base paper P reaches below the contact 12, the operation of the operating means 13 including the cam roller 18, the swing link 16, and the driven shaft 14 causes the contact 1.
2 descends toward one edge e of the base paper, and the leading end thereof contacts one edge e of the base paper. Since the base paper P runs as it is,
The streak-like adhesive f applied to one end edge e of the base paper P is extended in a strip shape by the contact 12. Then, immediately before the end of the base paper P passes below the contact 12, the contact 12 is raised by the operating means 13 and is separated from the base paper P. For this reason, the adhesive f does not protrude from the paper surface and does not hinder the traveling of the base paper.

Next, when the sheet P reaches the primary folded portion 3B, Orisuji L ₁ ~L ₄ at the primary folded unit is folded as shown in FIG. 8, then 9 the secondary folded portions 3C Yo Fold Line L
_{5, L 6} is folded. At this time, the one end edge e to which the adhesive f is applied and the other end edge e 'are bonded to face each other. , The both edges e and e 'of the base paper are instantly and strongly adhered. For this reason, when the bottom surface (square bottom) is formed at the one end opening of the obtained cylindrical body by the square bottom forming portion 4, the above-mentioned bonded portion does not peel off,
Thus, a good quality paper bag can be obtained.

Although the application example of the present invention has been described above, the sheet-fed bag making machine according to the present invention is not limited to the above-described configuration. Etc. can be used. Further, in addition to using the above-described cam mechanism as an operating means for moving the contact 12 up and down in accordance with the passage timing of the base paper, an actuator such as an electromagnetic solenoid is used, and the operation is performed by a sensor capable of detecting the presence or absence of the base paper. You may do it.

[0020]

As apparent from the above description, according to the present invention, in addition to the nozzle for discharging the adhesive on one edge of the base paper,
Since the contact is provided to extend the adhesive in a strip shape along one edge of the base paper, the adhesive application surface is widened and the adhesiveness is improved. In particular, when a synthetic resin-based adhesive is used, volatilization of the solvent is promoted, so that even a base paper made of synthetic paper can be strongly adhered instantaneously at both ends thereof.
For this reason, a good quality paper bag free from perforation defects can be obtained without the bonded portion peeling off when forming the bottom surface of the paper bag.

Further, since there is provided an operating means for lowering the contact toward one end edge of the base paper when the base paper passes below the contact, the adhesive is protruded from the base paper and is successively fed. Does not hinder driving. In addition, since a cam mechanism including a cam roller, a swing link, and a driven shaft is used as the operation means, the contact can be made to perform a positive movement with a simple structure.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a sheet-fed bag making machine.

FIG. 2 is a schematic plan view of a sheet-feed bag making machine.

FIG. 3 is a schematic perspective view showing a glued portion according to the present invention.

FIG. 4 is a schematic side view showing operating means for raising and lowering a contact.

FIG. 5 is a schematic side view showing a glued portion.

FIG. 6 is a partially enlarged view showing a glued portion.

FIG. 7 is a perspective view showing a state in which a base paper is creased.

8 is a perspective view showing a state in which the base paper of FIG. 7 is partially folded along a folding line.

9 is a perspective view showing a state in which the base paper of FIG. 8 has been folded and both edges have been stuck together.

FIG. 10 is a perspective view of a paper bag.

FIG. 11 is a perspective view showing a tubular body whose both sides are gusset-folded.

12 is a perspective view showing a state in which a bottom surface is formed on the cylindrical body in FIG. 11 (a state in which a paper bag is folded).

FIG. 13 is a schematic perspective view showing a work in progress of a paper bag made by a conventional sheet-fed bag making machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed part 2 Striated part 3 Body formation part 3A Glue part 4 Square bottom formation part 5 Nozzle 12 Contact 13 Operating means 14 Follower shaft 15 Mounting part 16 Oscillating link 18 Cam roller

Continued on the front page F term (reference) 3E075 AA08 AA28 BA48 BB23 DA03 DA04 DA05 DA14 DA32 DB23 DC45 DC48 DD02 DD33 DD45 GA04

Claims (3)

[Claims] 1. A sheet forming machine comprising: a sheet feeding section for feeding base papers one by one; and a body forming section for forming the base paper fed from the sheet feeding section into a flat cylindrical body. The portion has a glued portion for bonding both edges of the base paper, and the glued portion is on one edge of the base paper, and a nozzle for discharging the adhesive onto the paper surface, and a bonding portion discharged from the nozzle A contact for extending the agent in a band along one edge of the base paper. 2. A paper feed unit for feeding base paper one sheet at a time, a body forming unit for forming a flat tubular body whose both sides are gusset-folded while running the base paper fed from the paper feed unit; And a square bottom forming part that forms a square bottom surface at one end opening of the cylindrical body obtained in the section, wherein the body forming part is a glue for bonding both edges of the base paper. A gluing portion having a gluing portion on one edge of the base paper for discharging the adhesive onto the paper surface, and extending the adhesive discharged from the nozzle in a band along the one edge of the base paper. And an operating means for lowering the contact toward one end of the base paper when the base paper passes below the contact. A sheet-fed bag making machine, characterized in that: 3. The operating means is provided with a cam roller which rotates at a predetermined speed by receiving power from a driving unit for running the base paper, as a motor node, and a rotational angular movement about an axis for swinging the contact up and down. And a swing link extending from the driven shaft toward the outer peripheral cam contour surface of the cam roller so as to impart a rotational angular motion to the driven shaft, and to fix a contact to the driven shaft. 3. The single-wafer bag making machine according to claim 2, further comprising: a mounting portion.