JPH026623B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a heat-adhesive synthetic resin film, for example,
One end of a cylindrical material made of a flexible synthetic resin film that can be resin-coated or thermally bonded such as polyvinyl chloride or polyethylene is folded in as appropriate, and these are overlapped to form a square bottom. With a bottom plate made of a suitable composite material having a heat-adhesive resin layer on the inside of the square bottom pressed together, the folding piece and the folding piece are attached with a linear or loop-shaped fusion line that engages the entire folding piece. The present invention relates to an apparatus for automatically manufacturing a square bottom bag with a bottom plate formed by fusing an inner bottom plate.

(Prior art) Conventionally, it is very time-consuming to make a square-bottom bag with a reinforced bottom plate made of paperboard (cardboard), etc., because the shape of the square bottom part, its adhesion, and the bonding of the bottom plate involve complicated procedures. , which is mostly done manually,
It has the disadvantage of being extremely inefficient and expensive, and it is technically extremely difficult to manufacture it automatically. Conventional devices for forming square bottoms include, for example, Japanese Patent Publication No. 36-16097 and Japanese Patent Application Laid-Open No. 52-110171, but the former uses a cylindrical material made into the length of a bag, with a hexagonal bottom at one end. In the latter case, after forming a hexagonal bottom, the left and right triangular protrusions are fused to form a square base. Therefore, as in the present invention, a reinforcing layer is provided inside the square base. There is nothing that automatically completes the process of inserting the bottom plate and gluing the bottom of the bag to the bottom plate.

(Problems to be Solved by the Present Invention) The present invention forms one end of the cylindrical base paper into a square bottom shape, encloses a reinforcing bottom plate inside the square bottom, and fuses the square bottom and the bottom plate. However, it was considered extremely difficult to automate the packaging of the bottom plate and the processes before and after it.

(Means for solving the problem) The present invention has successfully solved this difficult problem. First, to briefly describe the main points, the present invention continuously and automatically manufactures a bag body having a square bottom. For this purpose, we found that it is better to use a cylindrical material with folded parts on both sides, so that the cross-sectional shape is 〓 (Fig. 5) with M characters facing each other horizontally. Use as starting material.

Now, in order to form a square bottom bag with a fused bottom plate, a part of the cylindrical material is folded in to form a square bottom, and then the bottom plate is inserted from the other end so that it touches the inside of the square bottom. Rather than manually welding the bottom plate to the bottom, it is more convenient to perform all of these operations at one end of the cylindrical material, and the work process is too slow to automatically form the bottom plate. It was necessary to simplify the manufacturing equipment, and as a result of many years of research, we found that it was advantageous in this respect.We inserted a bottom plate at a certain position inside one end of the cylindrical material and stopped it. The device is based on a device that continuously performs the operations of placing the end of the cylindrical material, and then folding the end of the cylindrical material. The outline of this specific automatic manufacturing device is as follows.

A mounting frame 2 is provided on which a cylindrical material made of synthetic resin is placed on a machine base 1 and moves back and forth intermittently between two fixed points. A terminal opening device B is provided at a position corresponding to a fixed point to vertically expand and open the front and back sides of the cylindrical material A on the mounting frame 2. A bottom plate loading device D for loading a bottom plate having a synthetic resin layer is provided at the innermost part of the end opening of the cylindrical material, and a bottom plate loading device D for loading the bottom plate having a synthetic resin layer is provided at the innermost part of the end opening opening of the cylindrical material, and a bottom plate loading device D for loading the bottom plate having a synthetic resin layer is provided, and the cylindrical material I is placed above the end of the mounting frame 2 on the side of the terminal opening device B. A terminal pressing device E for pressing the terminal portion is provided, and side folding plates 35, 35' and upper and lower folding plates 36, 37 are provided above and below and on the left and right sides of the terminal opening device side end of the mounting frame 2, respectively. A folding piece folding device F is provided, and four folding pieces on both sides of the corner bottom E and on the front and back are provided at a position corresponding to the other fixed point of the two fixed points on one horizontal side of the machine base 1. A manufacturing apparatus for a square bottom bag with a bottom plate fused, which is provided with a bottom welding device C that engages C, C, D, and D.

Although several methods of forming square bottoms are known, bags with good-looking materials or where the material is layered overlapping each other or where adhesive parts protrude outward look unsightly. It will be understood from the following description that the present invention is the simplest in this respect and forms a square bottom.

(Function) The final shape of the bag adopted in the present invention is as shown in Fig. 6. First, the process of forming this bag will be described in a generally manual order, unrelated to the device of the present invention. (Fig. 7 and below) The above-mentioned cylindrical material A (Fig. 5) with the folded portions A on both sides, cut to a certain length and prepared in advance, is inserted into the folded pieces C and C on both sides at one end.・Overlap and fold the folding pieces 2 and 2 on both sides of the back side to form the corner bottom E (7th
(Fig. 8), then insert the bottom plate from the end of the cylindrical material A to the inside of the square bottom E so that it touches the bottom (Fig. 8), and then insert this bottom plate and the four fold-in pieces into They are integrally heat-sealed by the fusing wire 51 that engages with the folded piece, and as a result, a square bottom bag 52 with a welded bottom plate as shown in FIG. 6 is formed.
The operation of the device of the present invention will be described in Examples.

(Embodiment) The present invention was devised to automatically carry out the process of forming such a bag, and one embodiment of the manufacturing apparatus according to the present invention will be described below with reference to the drawings.

First, let me explain the layout structure of the entire manufacturing equipment.
As shown in Figures 1 to 4, a synthetic resin cylindrical material is mounted on the machine base 1 and reciprocates intermittently in the front and back direction, that is, in the depth direction of the paper in Figures 1 and 2. A hydraulic drive device A is provided to control the intermittent reciprocation of this mounting frame 2, and a hydraulic drive device A is provided on one side of the machine base 1 in the direction of movement of the mounting frame 2. An end opening device B for opening the end of the cylindrical material A placed on the mounting frame 2 and a bottom welding device C are installed side by side, and the mounting frame 2 welds the end opening device B and the bottom welding device C. Two fixed point positions corresponding to the device C are configured to be moved back and forth intermittently by the operation of the hydraulic drive device A, and a terminal opening opening opened to the terminal pressing device B is provided at the back of the terminal opening device B. A bottom plate loading device D for loading the bottom plate having a synthetic resin layer at the innermost part is provided, and a terminal pressing device E for the cylindrical material A is provided above the end of the mounting frame 2 on the terminal opening device B side. Each folded piece C of the material A,
In order to fold C, D, and D, folding piece folding devices F are arranged in pairs on the upper, lower, and left and right sides of the terminal unfolding device B side end of the mounting frame 2, respectively. It has been done. Therefore, the specific configuration of each device is as follows.

Guide frames 1b, 1b are provided at both left and right ends of the upper surface of the machine stand 1, respectively, to support the left and right sides of the mounting frame 2 and guide it in a sliding manner. , 1b and bulges downward with a dimension approximately equal to the inner diameter of guide frame 1.
It is configured to be fitted between b and 1b to prevent left and right lateral wobbling, and to be able to slide only in the front and back direction. On the upper surface of the mounting frame 2, there is a cylindrical material receiving groove 2a which is open from above and has a concave cross section and penetrates in the left and right direction.
has been formed.

The hydraulic drive device A fixes the hydraulic cylinder 3 on the machine base 1 with its axis along the front and back direction, and
The free end of the telescopic rod 4 is fixed to the lower end of the connecting plate 6 fixed to the front end surface of the mounting frame 2 with bolts 5,
The mounting frame 2 is configured to be intermittently reciprocated in the front-back direction by the operation of a hydraulic cylinder 3.

The terminal opening device B is mounted on a pair of horizontal bars 8 and 8' that project horizontally toward the machine stand 1 side at a predetermined distance above and below from a vertical frame 7 erected on one side of the machine stand 1. A pair of hydraulic cylinders 9, 9 are fixed to horizontal rods 8, 8' with their axes aligned in the vertical direction, and the tips of the rods 10, 10' face each other, and each rod 10, 10' Horizontal guide plates 11 and 11' are fixed to the tips of the horizontal guide plates 11 and 11', respectively, and grooves 12 and 12' are formed along the left and right directions on the surfaces of the pair of horizontal guide plates 11 and 11'. Opening plates 13 and 13' are slidably inserted in the left and right direction to extend and open the terminal by a predetermined distance inside the terminal of A, and the terminal of the cylindrical material A is fitted onto the outer surface of the tip side. Insertion positioning protrusion 1
4, 14', and each horizontal guide rod 11, 1
1' has a plurality of guide shafts 15, 15'...,
16, 16'... are installed upright, and each of these guide shafts 1
5, 15'..., 16, 16'... pass through each horizontal frame 8, 8' to prevent horizontal movement of the horizontal guide frames 11, 11', and furthermore, each horizontal guide frame 11, Hydraulic cylinders 17 and 17' are installed inside the end of the machine base 1 side of 11' with their axes along the sliding direction of the open planks 13 and 13', respectively, and the free end sides of the rods 18 and 18 are installed inside. protrudes outward from the horizontal guide frames 11, 11', and its tips are fixedly connected to the backs of the end insertion positioning protrusions 14, 14' provided on the open planks 13, 13', and both hydraulic cylinders 17, 17 The opening panels 13, 13' are configured to slide by the operation of '.

The bottom welding device C has a hydraulic cylinder 20 disposed on a machine base 19 disposed on one side of the machine base 1 with its axis along a direction perpendicular to the sliding direction of the mounting base frame 2, A welding seal frame 22 is attached to the tip of 21.

The bottom plate loading device D is mounted on a machine base 23 disposed on one horizontal side of the machine base 1, with its axis aligned with the open planks 13, 13'.
A hydraulic cylinder 24 is provided along the sliding direction of the hydraulic cylinder 24, and a telescopic rod 25 of this hydraulic cylinder 24
At the same time, an L-shaped bottom plate mounting frame 26 is attached to the tip of the bottom plate mounting frame 26, and a ventilation hole 27 is formed passing through the center of this telescoping rod 25.
The other end is connected to a vacuum pump (not shown) and an air supply device (not shown) through a connecting pipe 29 equipped with a three-way switching valve (not shown). It is configured as follows.

The end pressing device E for the cylindrical material A includes a hydraulic cylinder 31 mounted on a horizontal frame 30 extending integrally from the machine base 1 side end of the upper horizontal guide frame 11' with its axis extending in the vertical direction. And its telescopic rod 3
2 is fixed so as to extend downward, and a groove 33 is bored at the lower end of this rod 32, and this is a rectangular shape that lightly presses the end of the cylindrical material 2 placed on the mounting frame 2. The upper side of a guide plate 34 having a shape is fitted and fixed. Also, this hydraulic cylinder 31
Guide rods 32a, 3 whose lower ends are fixed to the upper end pieces of the guide plate 34 are arranged at appropriate intervals on both sides of the guide plate 34.
2a is arranged so as to be able to freely slide up and down through the horizontal frame 30, thereby preventing the guide plate 34 from swinging. Therefore, the guide plate 34 is formed to have a dimension substantially equal to the sum of the moving distance of the mounting frame 2 and the depth dimension of the mounting frame 2, or to be slightly longer. In addition, the mounting frame 2 has the rising walls 2b, 2b on both sides of the cylindrical material receiving groove 2a, at the end on the terminal opening device B side, at the bottom of the groove 2a with a dimension that is at least approximately the same as the wall thickness of the guide plate 34. The lower side of the guide plate 34 is provided with cut-out portions 2c, 2c which allow the lower side of the guide plate 34 to press the cylindrical material more appropriately.

The folding piece folding device F includes a pair of side folding plates 35, 35' for folding folding pieces C and C on both sides of a cylindrical material A, and front and back folding pieces 2, It consists of a pair of upper and lower folding plates 36 and 37 that fold the sides, and a hydraulic cylinder that controls the operation of each plate. The dimple plates 35, 35' are formed of plates having a substantially base shape when viewed from the side, and their top portions 35a, 35a' are opposed to each other, and the space between the top portions is set in a non-active state so that the mounting frame 2
Open slightly wider than the front and back width of terminal opening device B.
The axis line is placed on the support frame 38 attached to the front side of the machine base 1 on the side, and the axis line is placed in the recessed hole 38a formed on the side surface of the terminal opening device B side of the machine base 1 on the bottom welding device C side.
The rods 40 and 40' of the two hydraulic cylinders 39 and 39' are disposed oppositely along the reciprocating direction of the rods 40 and 40', respectively.
It is configured to reciprocate within a predetermined dimension from the non-operating position to the center of the width of the mounting frame 2 in the longitudinal direction along the movement direction of the mounting frame 39'. Of the two hydraulic cylinders 39, 39', the hydraulic cylinder 39' located on the bottom welding device C side is mounted on a slide frame 41 that moves in and out of the recess 38, and is mounted on a slide frame 41 that moves in and out of the recess 38. 4
1, the side folding plate 35' on the side of the bottom welding device C can move toward and away from the side of the machine base 1, and this folding device F
When sliding the cylindrical material 2 with a bottom formed in the cylindrical material A to the bottom welding device C side, the slide frame 41 is protruded outward from the recessed hole 38a and this side surface is folded. A gap is formed between the plate 35' and the end surface of the mounting frame 2 to prevent the side folding plate 35' from coming into contact with the folded bottom.

The slide frame 41 is configured to be operated by a hydraulic cylinder 42 disposed within the machine frame 1 with its axis oriented in the left-right direction. Next, the upper and lower folding plates 36 and 37 are both formed of rectangular plates that are approximately equal in width to the front and back sides of the cylindrical material A, and the upper folding plate 36 is The upper end surface of the guide plate 34 of the terminal pressing device E is attached to the back side (terminal opening device side) so as to be able to swing up and down about the horizontal support shaft 43, and the lower folding plate 37 is attached with its lower end piece. It is mounted so as to be able to swing up and down about a horizontal support shaft 44 on the side surface 7 of the machine base 1, and one end of both horizontal support shafts 43, 44 is bent into an L-shape, and the free end thereof is connected to the guide. A hydraulic cylinder 4 is attached to the plate 34 and the side surface of the machine base 1 with its axis aligned in the vertical direction.
Link 4 to the tip of the rods 47 and 48 of 5 and 46
9 and 50 are connected to each other, and the pair of hydraulic cylinders 45 and 46 are configured so that the folding operation of the upper and lower folding plates is performed with a slight time difference. There is.

The structure device of the square bottom bag according to the present invention has the above-mentioned structure, and its function, that is, the function of forming the square bottom of the bag body, will be described as follows.

The cylindrical material A is moved from the end of the mounting frame 2 toward the terminal opening device B side, and from the free end of the open tension plate 13, 13' of the terminal opening device B to the terminal insertion positioning projection 14 14', and when it is supplied into the cylindrical material receiving slot 2a on the mounting frame 2 in a protruding state, the pair of upper and lower open panels 13, 13' The cylinder remains overlapped with the cylinder until it moves to the mounting frame 2 side by the operation of the hydraulic cylinders 17, 17' and the end insertion positioning protrusions 14, 14' come into contact with the end side of the cylindrical material A. The shaped material is inserted into the terminal (FIG. 9). Next, the guide plate 34 of the terminal pressing device E is lowered by the operation of the hydraulic cylinder 31 and lightly presses the cylindrical material I on the mounting frame 2, thereby preventing the cylindrical material I from moving. At this time, guide plate 3
4 on the terminal opening device B side, the end surface of the mounting frame 2 on the terminal opening device B side, and the terminal opening device B on the machine stand 1.
The side surfaces are located on the same vertical plane to form the innermost setting surface of the end opening of the cylindrical material A, which will be described later. When the cylindrical material A is thus stably set at a predetermined position on the mounting frame 2, the pair of open tension plates 13 and 13' set in the terminal are respectively moved by the operation of the hydraulic cylinders 9 and 9'. As it moves up and down, the front and back sides of the terminal are expanded vertically, and finally are completely opened (Figure 10 A,
B). Then, the bottom plate mounting frame 26 of the bottom plate loading device D, on which the bottom plate has been suctioned and placed in advance, is moved to the hydraulic cylinder 2.
4, the terminal opening device B passes through the gaps between the upper and lower horizontal guide plates 11, 11' and the opening plates 13, 13' and moves to the mounting frame 2 side to open the terminal. It is inserted to the deepest inside of the mouth. At this point, the three-way switching valve (not shown) is switched, and the communication between the vent hole 27 formed at the center of the telescopic rod 25 of the hydraulic cylinder 24 and the vacuum pump (not shown) is cut off, and the suction to the bottom plate is maintained. is released, the air supply device (not shown) and this ventilation hole 27 are communicated, and air is supplied into the ventilation hole 27, so that the bottom plate is easily separated from the bottom plate mounting frame 26 and the terminal It is supplied to the innermost part of the opening (Fig. 11).
When the supply to the bottom plate is completed, the bottom plate mounting frame 26 and the opening tension plates 13, 13' are simultaneously retired out of the terminal opening opening, and the side of the folding device F is folded. By the operation of the hydraulic cylinders 39, 39', the folding plates 35, 35' project a predetermined distance toward the center of the width of the mounting frame 2 in the longitudinal direction, so that the side folding pieces C, C move inward, respectively. It is folded in (Fig. 12 A and B). Then, when the side folding plates 35, 35' are retired, the pair of upper and lower folding plates 36, 37 are moved laterally by the operation of the two hydraulic cylinders 45, 46 with a slight time difference. As it is oscillated around the support shafts 43 and 44 from its horizontal standby position to its working position along the vertical direction, the table and
The folding pieces 2 and 2 on both sides of the back are successively folded inward, and are overlapped and folded onto the side folding pieces 2 and 3 that were folded earlier, forming a square bottom with a bottom plate. E is formed (Fig. 13 A,
B). At this time, the bottom plate mounting frame 26 returns to its initial position (the position shown by the solid line in FIG. 1) and enters a new bottom plate mounting position, and the upper and lower open planks 13 and 13' approach each other. It is polymerized and ready to receive the next cylindrical material. Next, when the upper and lower folding plates 36 and 37 are respectively swung to return to the horizontal position and return to the initial standby position, the mounting frame 2 places the cylindrical material I with the square bottom formed thereon. The cylindrical material A is then moved to the bottom welding device C side by the operation of the hydraulic cylinder 3, thereby transferring the cylindrical material A to the bottom welding process. Of the side folding plates 35, 35', the side folding plate 35' on the side of the bottom welding device C is located in the recessed hole 38a of the slide frame 41 together with its operating hydraulic cylinder 39'.
Due to the outward protruding movement, the folding plate 35' is separated from the side surface of the machine base 1, and the space between this folding plate 35' and the side surfaces of the terminal opening device B of the machine base 1 and the guide plate 34 as well as the end face of the mounting base frame 2. A transition space is formed at the bottom of the folded corner, so the bottom of the corner moves into this folding plate 3.
The cylindrical material A is smoothly conveyed to the bottom welding device C side without being hit by the welding device 5' (Fig. 14).
When the mounting frame 2 has finished passing, the slide frame 41 is retracted into the recessed hole 38a by the operation of the hydraulic cylinder 42, so that the folding plate 35' is returned to the initial standby position. Further, when the mounting frame 2 is slid, the guide plate 34 maintains its downward position, and the cylindrical material I is conveyed while being lightly pressed. Now, when the cylindrical material A reaches the position corresponding to the bottom welding device C by sliding the mounting frame 2, the welding seal frame 22 protrudes toward the mounting frame 2 side by the operation of the hydraulic cylinder 20, and is folded in. The welded seal frame 22 and the machine base are connected to the welded seal frame 22 and the machine base by folding pieces C and C on both sides overlapped with each other, folding pieces D and D on the front and back sides, and the bottom plate fitted in contact with their inner surfaces. 1 and guide plate 34
A heat-sealed wire 51 is formed in the form of a loop which is clamped between the side surfaces of the terminal opening device B and the end surface of the mounting frame 2 and engages with each of the folding pieces C, C, D, and D. As a result, a square bottom portion 52 with a bottom plate fused to the bottom is formed as shown in FIG. 6.

Thereafter, the guide plate 34 moves upward and returns to the initial standby position, and the welding seal frame 22 retires and returns to the initial standby position, and when the bag is removed from the mounting frame 2, the mounting The frame 2 slides back to the position corresponding to the terminal opening device B, and the above-mentioned work steps are then continued to continuously form the bag body.

As mentioned at the beginning, the thermoadhesive synthetic resin cylindrical material used in the device of the present invention is made of kraft paper or a roll made of water-resistant material coated with thermoadhesive synthetic resin on both the front and back sides. In addition to synthetic resin films made of paper, etc., flexible synthetic resin films that can be thermally bonded, such as polyvinyl chloride or polyethylene, are suitable. In addition to paperboard or cardboard that is coated to form a heat-adhesive synthetic resin layer and has water resistance, synthetic paper may also be used. Further, the order of operation of each device and member may be reversed as long as the original purpose is not deviated from.

(Effects of the Invention) In this way, the present invention allows square bottom bags to be formed continuously and automatically, so the production efficiency is dramatically improved compared to the conventional manual method, and mass production becomes possible. Therefore, it has the advantage of being able to provide the bag at a low price, and in addition, loading the bottom plate, folding the ends, and welding the bottom part are all done at one end of the cylindrical material, which simplifies the work process. In addition, it has the advantage that the entire device can be configured simply and rationally, and has great value in industrial use, making it possible to realize automatic bag making, which was previously considered impossible. This is an excellent invention.

[Brief explanation of drawings]

Fig. 1 is a front view of the manufacturing apparatus of the present invention with a partial cutout, an overall side view with a partial cutout, Fig. 3 is a back view with a partial cutout, and Fig. 4 is a line taken along the line shown in Fig. 3. 5 is a cross-sectional view, FIG. 6 is an explanatory diagram showing the state in which the square bottom bag is folded, and FIG. 7 is an explanatory diagram showing the state in which the folded piece of the cylindrical material is folded. 8 are explanatory diagrams showing a state in which the bottom plate is loaded on the bottom, and FIGS. 9 to 14 are explanatory diagrams of main parts showing the operation. Description of symbols, A...Hydraulic drive device, B...Terminal opening device, C...Bottom welding device, D...Bottom plate loading device, E...Terminal pressing device, F...Folding piece folding device, 1 ...Machine base, 2...Placement frame, 3...
...Hydraulic cylinder, 9,9'...Hydraulic cylinder,
13, 13'...Open tension plate, 22...Welded seal frame, 26...Bottom plate mounting frame, 34...Guide plate,
35, 35'...Side folding plate, 36, 37
...Vertical folding plate, 51...Fusion line, 52...
...Square bottom bag, A...Tubular material, B...Folding part,
C...Side folding piece, D...Front and back folding parts, H...Square bottom, H...Bottom plate, G...Terminal opening.

Claims (1)

[Claims] 1 A mounting frame 2 is provided on which a synthetic resin cylindrical material A is placed and moves back and forth intermittently between two fixed points, and one of the two fixed points is placed on one horizontal side of the machine stand 1. A terminal opening device B is provided at a position corresponding to a fixed point to vertically expand and open the front and back sides of the cylindrical material A on the mounting frame 2. A bottom plate loading device D for loading a bottom plate having a synthetic resin layer is provided at the innermost part of the end opening of the cylindrical material, and a bottom plate loading device D for loading the bottom plate having a synthetic resin layer is provided at the innermost part of the end opening opening of the cylindrical material, and a bottom plate loading device D for loading the bottom plate having a synthetic resin layer is provided, and the cylindrical material I is placed above the end of the mounting frame 2 on the side of the terminal opening device B. A terminal pressing device E for pressing the terminal portion is provided, and side folding plates 35, 35' and upper and lower folding plates 36, 37 are provided above and below and on the left and right sides of the terminal opening device side end of the mounting frame 2, respectively. A folding piece folding device F is provided, and four folding pieces on both sides of the corner bottom E and on the front and back are provided at a position corresponding to the other fixed point of the two fixed points on one horizontal side of the machine base 1. A manufacturing apparatus for a square bottom bag with a bottom plate fused, which is provided with a bottom welding device C that engages C, C, D, and D.