TWI542515B - Apparatus for inward folding of a corner of a tubular fabric and the method thereof - Google Patents

Description

Corner folding device and method for cylindrical fabric

The present invention is a corner inward folding device, particularly a corner folding device for a cylindrical fabric forming a valve opening on a bag.

Powdered materials such as cement, chemicals, or particulate matter such as fertilizers, polymers, feeds, etc. can be contained in bags that are loaded into the bag via specially designed feed ports on the bag. At present, the bags can be divided into two types, one is a back cover bag, and the other is a pad type bag.

The back cover bag is a cylindrical fabric made of coated fabric, which has a filling port, usually an externally mounted component. There are many automated production methods for making the back cover bag and adding it to the filling port, but Workmanship is quite complicated and expensive.

There are various ways in which a filling opening can be added to the backing bag. For example, U.S. Patent No. 5,158,730 discloses a collapsible tubular material as a filling port for a bag comprising an inner layer of a thermoplastic polymer and a metal foil layer. The patent also discloses a bag containing the filling port, wherein a preferred embodiment describes a tubular material placed inside the bag, an opening is formed in the bag, and the tubular material is connected to the opening to form a filling port. Shown in this is a back-up bag, not a pillow-shaped cover.

The above-mentioned U.S. Patent No. 5,158,370 discloses a telescopic bag provided with a sleeve valve comprising a round tube fabric having a heat seal gasket and a protective film protection round tube. The patent discloses that a telescopic bag has a sleeve valve to prevent damage when the sleeve valve is sealed to prevent the material in the bag from being exposed. The telescopic bag with the sleeve valve is provided with a protective film to make it easy to manufacture, and can prevent debris or not. Qualified goods occur. This patent discloses a backed bag.

U.S. Patent 6,595,688 discloses a valve port sleeve for use in a telescoping bag comprising a tubular fabric having a heat seal liner and a protective member protection tube. In one embodiment, the valve sleeve of the telescopic bag can avoid damage when the bag is sealed, and prevent the contents from leaking out. In addition, the telescopic bag with the valve port sleeve is provided with a protective film to make the bag difficult to be deformed and damaged during manufacture, and a cover-type bag is also disclosed.

U.S. Patent No. 7,311,442 discloses a plastic bag having a valve port, which is a back-bottomed bag. The valve port on the plastic bag allows air to escape, but another tube is used to fill the contents. The valve port is a plurality of narrow openings at the corners of the upper end. The sheet-like hanging piece on the plastic bag is located beside the narrow opening of the corner edge. After filling, the sheet-like hanging piece can be opened to close and seal the narrow opening. .

U.S. Patent No. 5,857,954 discloses a device for laying a cylindrical fabric flat to make a wide-sealed bag. It is known that a large number of machines for rapidly manufacturing a back-sealed bag are complicated in design and expensive to manufacture. The patent mainly provides a machine with low efficiency, but can produce a wide-sealed bag at a low cost, so that the production capacity can be exerted in a market with a small amount of production, and in the high-cost mass production, the device emphasizes that one can be provided. A lower cost machine.

U.S. Patent No. 6,326,683 discloses a device for pulling the end of a bag from a transversely conveyed flat cylinder during the manufacture of the bag. The patent provides a bottom end for pulling the end of the cylinder to produce a backed bag.

From the above, it is known that although there are many devices for manufacturing a closed-bottom bag, there is no automatic production device for manufacturing a valve port on a pad-type bag. Padded bags are increasingly used and are easier to manufacture than backed bags. In the disclosure of the previous case, the production machine for automatic folding and valve opening manufacturing of the pillowcase was not disclosed.

The manufacture of the pad type bag is relatively easy, and the cylindrical fabric is made from the woven fabric (coated or uncoated), and the corner of one end of the filling valve is folded and then formed by sewing, and the filling valve is in the pad type. The bag is currently done manually, which not only costs a lot of time, but also causes shortcomings such as unstable quality and low output.

The valve port on the back cover bag is set at a depth on both ends of one end (as shown in Figure 1A), and unlike the back cover bag, the folding of the pillow cover is only There is a corner that requires more complicated processing than it does.

The above prior art is mostly used for the back-sealing bag. At present, the valve bag to be made by the pad type is artificially manufactured, and the efficiency and quality are lowered due to the instability of manual production.

Therefore, it is a necessary problem to provide an automated production mechanism that rapidly forms a valve port on the corners of the pad bag and mass-produces and manufactures a high-quality bag.

In view of the above problems, it is an object of the present invention to provide a corner folding device for a cylindrical fabric which folds the corners of the containing bag to form a valve opening, and the contents can be filled by the valve opening.

The main object of the present invention is to provide a corner folding device for a cylindrical fabric. The cylindrical fabric has at least one open end and is formed with an upper piece and a lower piece when placed horizontally. The cylindrical fabric is clamped by a clamping machine. The living room is placed on the valve port forming table, and the corner folding device includes a first device and a second device. The first device comprises a suction means for separating the upper piece and the lower piece of the cylindrical fabric from the open end, and a folding forming means for reversing the upper piece backward to make the joint of the upper piece and the lower piece Forming a corresponding first inner fold surface and a second inner fold surface to create a fold surface on any inner fold surface; the second device has a means for folding back the upper sheet and overlapping the lower sheet, having a crease The crease surface will form an inner hem angle when overlapped.

Another object of the present invention is to provide a method for folding a corner of a cylindrical fabric, comprising: reversing the upper sheet backward, and forming a corresponding two inner fold surfaces at the joint between the upper sheet and the lower sheet; A crease is formed on any of the inner folds; and the upper sheet is folded back and overlaps the lower sheet, and the inner fold surface having the crease forms a crease surface.

The invention utilizes the first device and the second device to cut the sleeve into a certain length, generates an inner fold, makes a valve mouth, and then seams the edge of the sleeve to make the seal tightly close, thereby completing the manufacture of the valve port of the pillow cover. Process to reduce manpower and production time.

The above objects, features, and advantages of the present invention will be more apparent and understood. The preferred embodiments are described in detail below with reference to the accompanying drawings.

1‧‧‧Cylindrical fabric

2‧‧‧ accommodating bag

2A‧‧‧Open end

2B, 2C‧‧‧ corners

2D‧‧‧ seam end

3‧‧‧Transport platform

3A‧‧‧Valve forming platform

4‧‧‧Clamping machine

5‧‧‧ distance

6‧‧‧Next film

7‧‧‧Upper film

8‧‧‧Perforation

8A‧‧‧Upper suction parts

8B‧‧‧ Lower suction parts

10‧‧‧ first device

11‧‧‧First inner fold

11A‧‧‧Second inset

11B‧‧‧ crease surface

12‧‧‧second device

13‧‧‧Inside corner

15‧‧‧Vacuum pumping device

15A‧‧‧ trachea

16‧‧‧ flat bar

17‧‧‧ crease parts

17A‧‧‧ convex plate

17B‧‧‧creative arm

18‧‧‧hexagonal shape

18A‧‧‧First corner

18B‧‧‧second corner

19‧‧‧ Curve guidance system

19A‧‧‧ Curved rod

20‧‧‧Blowing parts

21‧‧‧ rebound board

30, 40‧‧‧ valve port

Figure 1A is a schematic view showing the structure of a valve port of a closed-bottom bag.

FIG. 1B is a schematic view showing a structure of a pillow case and a valve port.

Fig. 2 is a flow chart showing the manufacture of the corners of the cylindrical fabric of a preferred embodiment of the present invention.

Fig. 2A is a schematic view showing the state of the cylindrical fabric in the respective processes of Fig. 2.

Figure 3 is a partial schematic view of the corner folding device of the accommodating bag of a preferred embodiment of the present invention.

Fig. 3A is a schematic view showing the accommodating bag of the preferred embodiment of the present invention clamped by the holding mechanism.

Fig. 3B is a schematic view showing the structure of a convex plate in which a accommodating bag forms a crease according to a preferred embodiment of the present invention.

Figure 4 is a side elevational view of a corner inset device of a preferred embodiment of the present invention.

Fig. 4A is a schematic view showing a blowing operation in a preferred embodiment of the present invention.

Figure 5 is a schematic view showing the structure of a curved guiding system of a preferred embodiment of the present invention.

Figure 6 is a schematic illustration of the geometry of the containment bag of the preferred embodiment of the present invention at various points in Figure 5 via a curved guide system.

6A-6B are diagrams showing a preferred embodiment of the present invention having an inner hem angle having a different angle.

When fabrics or fabrics are used for the cover of a pillow, complicated manufacturing steps are required, for example, cutting the cylindrical fabric into a certain length, folding the flap to make the valve opening (including the inner fold and the crease), and finally the sleeve. The edges are sewn or tightly bonded by heat pressing.

Please refer to FIG. 1B for a schematic view of the general sleeve and valve port structure. The sleeve has a valve port 40. The present invention is a device and a method for manufacturing such a sleeve, which is to cut the sleeve into a certain length and generate an inner fold. Make a valve port and then sew the edge of the sleeve to make it tightly closed.

The invention will now be further described with reference to the drawings and specific embodiments of the invention. In the present invention, a fabric refers to a coating or uncoated fabric, a woven or non-woven fabric, a quilt, a flexible film or the like which can be formed from any suitable material of the kit.

2 is a flow chart showing the manufacturing process of the corners of the cylindrical fabric of the present invention, and FIG. 2A is a schematic view showing the state of each corner of the corner inward folding process of the present invention with respect to FIG. The accommodating bag 2 used in this embodiment is cut from a long length of the cylindrical fabric 1 by a fixed length, so that the accommodating bag 2 is also a cylindrical textile. The receiving bag 2 has an open end 2A at one end and a slit end 2D at the other end. The open end 2A has two corners 2B, 2C, and in order to mount the valve opening 30 on one of the corners 2B or 2C after forming the inner folded surface, an "inwardly folded" corner must be made. In the present invention, the inner bag and the lower piece are formed when the accommodating bag 2 is horizontally placed, and an inner hem angle 13 is formed at a corner of the joint between the upper piece and the lower piece, which is currently used in the industry. This inwardly folded corner 13 is manually completed.

The embodiment disclosed by the present invention is an automated production apparatus for producing an inner hem angle 13 which, although described as a accommodating bag for a pillow, is also applicable to a sleeve or bag type cylindrical for any use. Fabric, whether it is an automatic or semi-automatic production method.

The apparatus of the present invention is an operation of an inner fold forming machine, a crease forming machine, and a crease correcting machine. Referring to Figures 2 and 2A, a general sleeve production device will have a long cylindrical fabric 1 produced by a supply station with a drum receiving unit, and a roller of the supply station in step S21 will be reversed to form a long cylindrical fabric. 1 is supplied to step S22, the cutting unit cuts out the fixed length storage bag 2, and then in step S23, the bottom portion thereof is folded into a single fold or a double fold in an in-folding machine, and the inner folding machine is disposed on a conveying platform, and a sewing machine is located Next to the inner folding machine, after the bottom of the containing bag 2 is folded, the step S24 is sent to the sewing machine to completely seal the bottom portion to form a semi-finished storage bag 2, as shown in Fig. 1B.

After cutting, the cylindrical fabric 1 is folded and sewn, leaving the other open end to form a receiving pocket 2 for accommodating the object. Next, in step S25, the containing bag 2 is conveyed via a transfer to a valve opening forming platform which is part of the conveying platform. Step S26 uses the folding machine and the crease forming machine to re-fold and fold the opening of the accommodating bag 2, and step Step S27, the crease of the accommodating bag 2 is leveled using the crease correcting machine, the opening portion of the accommodating bag 2 is folded in step S28 to generate the inner hem angle 13, the step S29 sews the opening of the accommodating bag 2 with the sewing unit, and the steps The S30 stacking unit stacks the finished containment bag 2 products with the valve ports 30 together.

Next, the following describes the automatic corner folding device of the present invention in steps S26 to S29 in detail. Please refer to Figs. 3 and 4 for an embodiment of the corner folding device of the accommodating bag of the present invention. The accommodating bag (cover) 2 has at least one open end which is in the original cut state and forms an upper piece 7 and a lower piece 6 when placed horizontally, and the accommodating bag 2 is provided by a holding machine 4 (as shown in FIG. 3A) ) clamped and has a fixed distance 5 from the open end to facilitate subsequent operation of the opening. In an embodiment, the gripper 4 may have a pair of upper conveyor belts and a lower conveyor belt, which may be used to fix one end of the seam when the folding forming means is used, and the gripping machine 4 can grip and convey the receiving pocket 2 In addition to the function, it is also possible to press the accommodating bag 2 during folding to avoid any unnecessary displacement.

The accommodating bag 2 is flattened, cut, sewn, and placed flat on the transport platform 3, and is prepared to form a valve port 30 at the open end 2A. When the accommodating bag 2 is sensed on the transport platform 3, the transport platform 3 starts to rotate.

Next, please refer to FIG. 3B to make a valve port on the accommodating bag 2, the lower piece 6 of the accommodating bag 2 contacts the conveying platform 3, and the valve port forming platform 3A at the conveying platform 3 has a plurality of perforations 8 to provide the lower piece 6 A suction means such as a vacuum pumping device 15. The vacuum pumping device 15 has an air suction port followed by a gas pipe 15A. The suction means has an upper suction member 8A for sucking the upper sheet 7 and a lower suction member 8B for sucking the lower portion. Slice 6. A lower support plate (not shown) is placed under the accommodating bag 2 at the time of the reverse crease forming means to facilitate the formation of creases.

According to the above, the corner folding device of the cylindrical fabric according to the embodiment of the present invention includes a first device 10, such that the joint between the upper sheet 7 and the lower sheet 6 forms a corresponding first inward surface 11 and a second inner folded surface 11A which produces a crease surface 11B on any inner folded surface; and a second device 12 having a crease member 17 for folding back the upper sheet 7 and overlapping the lower sheet 6 with a fold The crease surface 11B of the mark forms an inner hem angle 13.

Referring again to Figure 4, the second device 12 is located on the transport platform 3. The first device 10 has a suction means for separately accommodating the sheet 7 and the lower sheet 6 from the bag 2 from the open end 2A. Therefore, the suction means is for providing the upper suction member 8A and the lower suction member 8B, the upper suction member 8A sucking the upper sheet 7, and the lower suction member 8B sucking the lower sheet 6.

In one embodiment, the lower suction member 8B is formed by a plurality of perforations 8 of the 3A on the valve port forming platform, and a gas blasting member 15 is evacuated from the gas pipe 15A. Similarly, the upper suction member 8A is also pumped from the air tube 15A by an air blowing member 15, and the upper sheet 7 is sucked up and moved from the vertical direction of the transport platform 3.

When the inner corners 13 are made, the suction means can fix the lower piece 6 and move the upper piece upward from the vertical direction of the conveying platform 3, thus separately accommodating the upper and lower sheets 6 of the bag 2.

Furthermore, the first device 10 has a flat pressing rod 16 and a crease member 17, which is controlled by a controller having an executable program to form a corresponding first inset at the junction of the upper sheet 7 and the lower sheet 6. The face 11 and the second inner fold face 11A create a fold face 11B on either of the inner fold faces. Wherein, the crease member 17 has a crease arm 17B coupled to a convex plate 17A, and the direction in which the convex plate 17A moves is the transport direction of the vertical conveying platform 3.

The folding forming means is for providing a flat pressing rod 16 to advance in the horizontal direction of the surface of the parallel conveying platform 3 and perpendicular to the moving direction of the cylindrical fabric, and the insertion upper sheet 7 is sucked up and formed with the lower sheet 6. The depth of the space is determined by the size of the valve port, and the depth is also determined by the distance 5 from the open end 2A when the holding machine 4 grips the containing bag 2. Next, the flattening rod 16 is pulled out to form a hexagonal shape having a first corner 18A and a second corner 18B. The upper sheet 7 is folded back to the rear to form a corresponding first inner folded surface 11 and second inner folded surface 11A at the joint of the upper sheet 7 and the lower sheet 6, and the upper sheet 7 is folded back to overlap with the lower sheet 6. An inwardly folded layer is formed between the upper sheet 7 and the lower sheet 6 of the open end 2A of the containing bag 2.

After the flattening rod 16 is pulled out, a convex plate 17A receives a downward pressing force, and the optimum way of generating the downward pressure is generated by pneumatic means, and the pneumatic element is also a part of the first device 10.

Please refer to FIG. 6A to FIG. C to show the geometrical shape of the accommodating bag of the present invention in each point of FIG. 5 via the curved guiding system, and one of the two inner folding faces 11 and 11A produced by the accommodating bag 2 ( A valve port is provided between the convex plate 17A and the lower support plate (below the receiving bag 2) to form a crease surface 11B, and the edges of the crease surface 11B are indicated by F1 and S2. The convex plate 17A moves upward and moves the flat pressing rod 16 to the middle between the upper piece 7 and the lower piece 6. The movement of the two is simultaneously synchronized, and only the side of the first inner folding surface 11 is creased, and the other side is The two inner fold faces 11A have no creases. In the present embodiment, the convex plate 17A has a triangular shape.

The hexagonal shape formed in the opening of Fig. 6 has six sides A, E1, E2, B, F2, and F1, and the opening has four sides A, B, C, and D. F1 and F2 are the first corners 18A, and E1 and E2 are the second corners 18B, and the corners described above are different from the sides of the opening.

Please also refer to FIG. 5 for a schematic structural view of a curved guiding system according to an embodiment. The second device 12 includes a curved guiding system 19 and a rebounding plate 21. After the upper piece 7 and the lower piece 6 are separated in FIG. 6A, The upper sheet 7 is turned to the direction in which the inner surface thereof is away from the lower sheet 6. In order to form the inner folded corner 13, the inverted portion of the upper sheet 7 must also be folded back and the inner surface of the upper sheet 7 by a curved guiding system 19. 6 is close, and only the accommodating bag 2 is pushed over the curved guiding system 19, and the upper piece 7 is folded back to be close to the lower piece 6.

In addition, the curved guiding system 19 comprises a curved plane formed by a series of curved rods, which can fold the upper sheet 7 back and overlap with the lower sheet 6. The curved rod is a hollow or solid structure, forming a curved surface. The cross-sectional shape of each curved rod may be square, circular, elliptical or polygonal, and the like. In another embodiment, the curved guide system 19 can also be a curved contour plane that is shaped as a rotating plane that assists in folding back the topsheet 7 when it is folded back. For example, when the upper sheet 7 is facing away from the conveying platform 3 and is attached to the curved plane, the upper sheet 7 faces the conveying platform 3 after passing through the path of A→B→C on the curved plane.

The sleeve formed by the accommodating bag 2 as shown in Fig. 6A is placed at the starting point of the curved guiding system 19, and the inner surface of the upper sheet 7 is facing away from the conveying platform 3, and the inner surface of the upper sheet 7 is the surface when the final position is reached. For the transport platform 3, the upper sheet 7 is again superposed on the lower sheet 6, because This closes the open end 2A.

One of the key points of the present invention is that when the corner at the other end without the crease is closed at the open end 2A, the original shape is restored without the occurrence of an inner hem at both sides. However, in the case of a high-speed operation, it is necessary to ensure that this situation does not cause an error, and an auxiliary operation must be performed, that is, the special closing operation can be accomplished by using pressurized air to jet in a specific direction.

Furthermore, the second device 12 further includes a gas blasting member 20 having at least one gas pipe 15A. During the generation of the inner hem angle 13, the gas is ejected from the gas pipe 15A, and after passing through a rebounding plate 21, the gas is blown toward the gas. An crease-free corner. Therefore, in Fig. 6, Figs. A, B, and C show that the first inner folded surface 11 is formed into an inner folded corner 13 when the open end is blown into a hexagonal shape 18 by a gas. Further, the D1 and D2 sides of the second inner folded surface 11A are pushed outward by gravity and the blowing of the pressurized air, and are blown to the inner side on the sides C1 and C2 of the first inner folded surface 11, and then the blowing is stopped. Thereafter, the upper sheet 7 is overlapped and closed by the influence of gravity, and the inner sheet is folded inwardly.

According to the above, the angle of the inner fold is determined by the angle formed by the middle line formed by the inner fold and the side of the inner fold, and is divided into an upper angle and a lower angle, and the upper angle is the same as the lower angle.

In the foregoing second figure, in step S28, the accommodating pockets 2 are overlapped to form a shape having an inner hem angle 13, and the inner hem angle 13 can be provided with a valve opening 30; in step S29, the upper portion of the accommodating pocket 2 is sewn and finally A receiving pocket 2 having a valve port 30 is completed.

The corner inward folding device of the present invention has an executable program controller that controls the operation of the first device and the second device to perform a corner folding operation of the cylindrical fabric.

In another embodiment, see 6A, 6B in FIG. A _u and A _l angle, which angle A _u and at an angle A _l is not the same, so that the folded size is not a fixed angle, That is, the size of the inner fold has a variable depth.

In another embodiment, a curved plane formed by a flat plate can be used as a curved guiding system in the present invention, and the material can be made of metal, plastic or wood, and a plurality of perforations can be arranged on the curved plane.

In summary, the corner folding method of the present invention includes: the first device The upper piece is folded back to make the opening of the fabric form a hexagonal shape, and the joint between the upper piece and the lower piece forms two corresponding inner folding faces; and the second device: a fold is formed on an inner folded surface The mark is folded back and overlapped with the lower piece and sewn to form a valve port. The corner inner folding device of the present invention uses the first device and the second device to complete the valve port installation process of the accommodating bag or the pillow case, thereby reducing manpower and production time.

In view of the various embodiments described above, it will be appreciated that the present invention encompasses the following elements.

A corner fabric folding device for a cylindrical fabric, the cylindrical fabric having at least one open end and being formed horizontally to form an upper sheet and a lower sheet, the cylindrical fabric being clamped by a gripping machine at a valve port On the forming table, the corner folding device comprises: a first device comprising: a suction means for separating the upper piece and the lower piece of the cylindrical fabric from the open end; and a folding forming The method is used for reversing the upper piece backwards, so that the first inner and lower inner folding surfaces are formed at the joint between the upper piece and the lower piece, and a fold is formed on any of the inner folding surfaces. And a second device having a means for folding back the top sheet and overlapping the lower sheet, the fold surface having the folds forming an inner fold angle when overlapped.

The valve port forming table is provided with a plurality of perforations.

The suction means is for providing an upper suction member for sucking the upper sheet and a lower suction member for sucking the lower sheet.

The upper suction member moves the upper sheet upward from a direction perpendicular to a transport platform.

The folding forming means is for providing a flat pressing rod and a crease member, the flat pressing rod is movable along a horizontal direction parallel to the conveying platform, and perpendicular to a moving direction of the cylindrical fabric, the crease member has a A raised plate that moves in a direction perpendicular to the transport platform.

The flat pressing rod advances in a horizontal direction parallel to the conveying platform, inserting a space formed by the upper sheet being sucked up and formed by the lower sheet, so that the opening forms a hexagonal opening shape, the hexagonal shape The opening shape forms a first corner and a second corner on both sides.

The crease member is configured to press the embossed surface of the convex plate to form a crease on any of the inner folded surfaces, and then the flat pressing rod and the crease member are retracted, and the cylinder having the crease surface The fabric moves its opening against a curved guiding system, folds back into the upper sheet and overlaps the lower sheet and forms an inner folding corner on the crease surface of the open end, wherein the curved guiding system is Part of the folding means of the second device.

The curved guiding system comprises at least one curved rod, which can fold the upper sheet back and overlap with the lower sheet, the curved rod is a hollow or solid structure, and the sectional shape thereof is selected from a square shape, a circular shape, One of the groups of ovals and polygons.

The curved guiding system further includes a curved structural surface that assists in folding back to the lower sheet when the upper sheet is folded back.

The second device further includes an air blowing component having at least one air duct and a rebounding plate, the air blowing component ejecting gas from the air duct, and the gas is guided to the inside of the non-crease through the rebounding plate Folded face.

The crease member has a heating element for heating the area being contacted.

The crease member has a blowing element for delivering gas between the upper sheet and the lower sheet of the opening.

The inner fold angle has a variable length.

The inner folded corner forms an upper angle with the upper piece on the inner side, and forms an angle with the lower piece, the upper angle being the same as the lower angle.

The inner folded corner forms an upper angle with the upper piece on the inner side, and forms an angle with the lower piece, the upper angle being different from the lower angle.

The relief has a geometric shape.

The flat bar is in the form of a strip or a round rod.

The curve guiding system is a curved plane whose material is selected from one group consisting of metal, plastic and wood.

The corner inward folding device further includes a controller having a program to perform the action of the corner inward folding device.

One end of the cylindrical fabric is a seamed end, and the gripper clamps the seam The end securely fixes the cylindrical fabric when the crease surface is produced.

A corner folding method for a cylindrical fabric, wherein the corner folding method is used for the corner folding device, wherein the corner folding method comprises: folding the upper sheet backward to make the upper sheet and the upper sheet Forming a corresponding two inner fold faces at the joint of the lower sheets; creating a fold on any of the inner fold faces; and folding back the top sheet and overlapping the lower sheet, having an inner fold of the fold The crease surface is formed, wherein the inner hem angle forms an upper angle with the upper sheet on the inner side, and forms an angle with the lower piece, the upper angle being different from the lower angle.

The specific embodiments of the present invention have been described in detail above, but the invention is not limited to the specific embodiments described above. Any equivalent modifications and substitutions are also within the scope of the invention for those skilled in the art. Accordingly, equivalent changes and modifications may be made without departing from the spirit and scope of the invention.

2‧‧‧ accommodating bag

3‧‧‧Transport platform

4‧‧‧Clamping machine

8A‧‧‧Upper suction parts

10‧‧‧ first device

12‧‧‧second device

15‧‧‧Vacuum pumping device

15A‧‧‧ trachea

16‧‧‧ flat bar

17‧‧‧ crease parts

17A‧‧‧ convex plate

17B‧‧‧creative arm

19‧‧‧ Curve guidance system

20‧‧‧Blowing parts

21‧‧‧ rebound board

Claims (22)

A corner fabric folding device for a cylindrical fabric, the cylindrical fabric having at least one open end and being formed horizontally to form an upper sheet and a lower sheet, the cylindrical fabric being clamped by a gripping machine at a valve port On the forming table, the corner folding device comprises: a first device comprising: a suction means for separating the upper piece and the lower piece of the cylindrical fabric from the open end; and a reversing Forming means for reversing the upper sheet backward so that a joint of the upper sheet and the lower sheet forms a corresponding first inner fold surface and a second inner fold surface, and any of the inner fold surfaces A crease surface is created thereon; and a second device having means for folding back the top sheet and overlapping the lower sheet, the crease surface having creases forming an inner hem angle when overlapped. The corner fabric folding device of the cylindrical fabric of claim 1, wherein the valve opening forming table is provided with a plurality of perforations. The corner folding device of the cylindrical fabric of claim 1, wherein the suction means is for providing an upper suction member and a lower suction member for sucking the upper suction member The lower suction member is for sucking the lower piece. A corner folding device for a cylindrical fabric according to claim 3, wherein the upper suction member moves the upper sheet upward from a direction perpendicular to a conveying platform. The corner folding device of the cylindrical fabric of claim 1 or 4, wherein the folding forming means is for providing a flat pressing rod and a crease member, the flat pressing rod being transportable along the parallel The horizontal movement of the platform, and the direction of movement of the cylindrical fabric, the crease member has a convex plate that moves in a direction perpendicular to the transport direction of the transport platform. The corner folding device for a cylindrical fabric according to claim 5, wherein the flat pressing rod advances in a horizontal direction parallel to the conveying platform, and the inserted upper sheet is sucked up and down a space in which the sheet is formed such that the opening forms a hexagon The opening shape of the hexagon forms a first corner and a second corner on both sides. The corner folding device for a cylindrical fabric according to claim 6 , wherein the folding member is configured to press the convex plate to form a crease surface having a crease on any of the inner folding surfaces. The flattening rod and the crease member are then retracted, and the cylindrical fabric having the crease surface moves its opening against a curved guiding system, folding back the upper sheet and overlapping the lower sheet and at the open end An inner hem angle is formed on the crease surface, wherein the curve guiding system is part of the folding means of the second device. The corner folding device of the cylindrical fabric of claim 7, wherein the curved guiding system comprises at least one curved rod which can fold the upper sheet back and overlap with the lower sheet, the curved rod As a hollow or solid structure, the cross-sectional shape is selected from one of a group consisting of a square, a circle, an ellipse, and a polygon. The corner fabric folding device of the cylindrical fabric of claim 8, wherein the curved guiding system further comprises a curved structural surface for assisting in folding back the upper sheet to overlap the lower sheet. The corner folding device of the cylindrical fabric of claim 1, wherein the second device further comprises an air blowing member having at least one air duct and a rebounding member, the air blowing component The gas is ejected from the air duct, and after passing through the rebounding plate, the gas is directed to the inner fold surface without creases. A corner folding device for a cylindrical fabric according to claim 5, wherein the crease member has a heating element for heating the contacted area. A corner folding device for a cylindrical fabric according to claim 5, wherein the crease member has a blowing member for supplying gas between the upper sheet and the lower sheet of the opening. The corner folding device of the cylindrical fabric of claim 1, wherein the inner corner has a variable length. The corner folding device of the cylindrical fabric of claim 1 or 13, wherein the inner folding angle forms an upper angle with the upper piece on the inner side, and forms the lower piece At the lower angle, the upper angle is the same as the lower angle. The corner folding device of the cylindrical fabric of claim 1 or 13, wherein the inner folding angle forms an upper angle with the upper piece on the inner side, and forms an angle with the lower piece, the upper angle and The lower angles are different. A corner folding device for a cylindrical fabric according to claim 5, wherein the relief has a geometric shape. The corner folding device for a cylindrical fabric according to claim 5, wherein the flat pressing rod has a shape of a strip or a round rod. The corner fabric folding device of the cylindrical fabric of claim 7, wherein the curve guiding system is a curved plane, and the material is selected from the group consisting of metal, plastic and wood. The corner folding device for a cylindrical fabric according to claim 1, further comprising a controller having a program executable to perform the corner folding device. The corner folding device of the cylindrical fabric of claim 1, wherein one end of the cylindrical fabric is a seam end, and the gripper clamps the seam end to produce the fold surface The cylindrical fabric is fixed at the time. A corner folding method for a cylindrical fabric, the corner folding method for the corner folding device according to claim 1, wherein the corner folding method comprises: providing a patent application scope item 1 The corner inward folding device; the first device reflexes the upper sheet backward to form a corresponding inner fold surface of the joint between the upper sheet and the lower sheet; A crease is formed on the inner fold faces; and the second device folds back into the top sheet and overlaps the bottom sheet, and the inner fold surface having the crease forms the fold surface. The method for corner folding of a cylindrical fabric according to claim 21, wherein the second device forms an upper angle with the upper piece on the inner side and forms an angle with the lower piece, The upper angle is different from the lower angle.