JP5357591B2 - Rounding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a round punching device for improving quality and cutting accuracy of a round sheet while getting automatized and more efficient. <P>SOLUTION: The round punching device for punching a square sheet (4-A) made of papers or synthetic resin sheets to have a circular shape includes: a clamping mechanism (upper 4-C, lower 4-C) for clamping the square sheet (4-A); a circular blade (4-E) vertically movable for cutting the square sheet (4-A); and a rotating mechanism (4-F) for rotating the cut sheet by a certain angle. The square sheet (4-A) is cut by the circular blade (4-E) every rotation of the rotating mechanism. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an apparatus for punching a packaging material or a protective material such as paper, paperboard, film, or plastic sheet into a circle from a rectangular sheet. More specifically, the present invention relates to a technique for manufacturing a round wrapping paper or a protective sheet that is inserted into or bonded to a small edge when packaging a roll product.

  These roll-shaped paper products have various diameters, and it is necessary to prepare a circular wrapping paper according to the diameter for packaging. In the pulp and paper industry, with the recent spread of offset rotary printing presses, cases of processing paper products for rotary printing into rolls and delivering them to printing factories are increasing. Further, in order to improve the printing efficiency, the diameter of the roll paper tends to gradually increase. As a result, the roll paper having a diameter of about 1 m, which has been the mainstream in the past, has recently become a large diameter of 1.5 m, and there are various types of diameters. For this reason, it is necessary to prepare various types of wrapping paper and protective sheets to be applied to the forehead.

  As a method of cutting a circular paper, there is a method of obtaining a perfect circle by fixing a paper to be cut from a sheet and moving the cutter to be moved in a circular motion while sequentially moving the cutter (for example, Patent Document 1). See). In addition, a method has been proposed in which a sheet of paper is cut while being rotated by a holding device using upper and lower rotary blades (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 3-208596 Japanese Patent Laid-Open No. 9-109091

  Conventionally, circular packaging materials that are inserted into and bonded to the edge of these rolls have been manufactured by punching a single sheet that has been cut into a square shape in advance. In the technical present state, the following two methods are widespread, both of which are inefficient work, and improvement is expected.

  For example, as shown in FIG. 1, the method disclosed in Patent Document 1 clamps the center of a square sheet prepared in advance with a clamp device (1-A), and extends from the swing arm ( The cutter knife (1-C) attached at a position separated from the center of 1-B) by a predetermined distance is rotated by using the swing arm drive motor (1-D) provided on the upper part of the clamp device. It has a structure of cutting out into a circle. Since this type of device has a simple structure, it is convenient for punching a small amount together with an advantage that the installation cost of the device can be kept low, and a considerable number of devices are installed and operated.

  However, rotating cutter knives are easily worn and the number of punches that can be punched at a time is limited. Knife cuts are often fluffy and are not suitable for applications that require accuracy and quality. Further, the number of rectangular sheets that can be cut at a time is limited to 10 to 50 sheets depending on the unit weight, and it can be easily determined that the productivity is low. Moreover, the method disclosed in Patent Document 2 is to cut a square sheet by rotating a pair of upper and lower rotary blades while rotating a rectangular sheet, thereby obtaining a circular workpiece. Similarly, there is a limit to the number of square sheets that can be cut at a time.

  As shown in FIG. 2, the other method is a structure in which a circular blade (2-A) prepared in advance is pressed onto a sheet by a hydraulic cylinder (2-B) and punched out. Since this method can prepare a circular strong blade in advance, a relatively large number of sheets can be extracted at a time. In addition, it is known that the cut surface can be punched relatively neatly because of the push-down type. However, since the circular blade is moved up and down with a hydraulic press, it is suitable for punching with a small diameter. A heavy and long press machine is required.

  In addition, as described above, the circular sheet needs to be prepared with circular blades having a large number of diameters due to various small diameters of the roll-shaped packages. Therefore, it is necessary to replace the circular blade every time the diameter of the cutting sheet is changed, and when a small amount is punched over multiple dimensions, the efficiency is greatly reduced. In addition, since the circular blade is a special blade, it requires a grindstone with a special mechanism for polishing, and together with the cost of the heavy and long press device, this increases the unit cost of this punching operation. Yes.

  Further, although the number of sheets to be punched at once is larger than that of the “arm rotary round punching device” described above, the limit is about 50 sheets, and the cutting work efficiency is low. Also, dislike the cost and labor of preparing a strong blade as in the above example, and applying the technology for punching paper containers and cardboard generally called punching, it is also possible to use the cutting blade disposable Are known. Although the blade replacement time in this case is significantly shortened compared to the case of using the above-mentioned strong blade, the number of blades that can be removed at a time may be reduced to a few due to constraints such as the rigidity of the blade. Are known.

  Thus, the present invention has focused on that the packaging materials such as circular paper, paperboard, film and plastic sheet used in this application do not necessarily have to be a perfect circle. More specifically, the packaging material that is the subject of the present invention is generally used in a configuration as shown in FIG. FIG. 3 shows a package of paper (winding) wound up in a roll shape manufactured for a rotary printing press. Such packaging is generally performed by combining a polyethylene laminated paper called “wamp” and a board called “liner” in the paper industry.

The inside paper (3-D) in this figure uses a one-pump having a basis weight of about 80 g / m ^{2, and} a piece having a diameter of about 200 mm larger than the diameter of the wound product to be packaged is inserted into the winding edge. Since it is folded so as to form a crease with the winding packaging one-pump (3-A) wound around the winding drum in the process, it is a somewhat rounded shape if it is a pseudo-circular sheet, that is, a sheet having a shape close to a circle But it can fulfill its function. Therefore, the octagonal shape or the hexagonal shape does not cause a problem in use. The outside paper (3-G) does not need to be a perfect circle because a liner having a basis weight of about 170 g / m ² is used and is bonded at the end of the packaging process of the roll-shaped wound product. It is required to be a circle that does not feel uncomfortable nearby.

  The present invention focuses on these points, and an object thereof is to provide a rounding device that realizes automation and efficiency, and at the same time, improving the cut edge accuracy and quality of a circular sheet.

  In order to solve the above-mentioned problems, the present inventors have intensively studied. As a result, in a round punching device for punching a square sheet made of paper or a synthetic resin sheet into a circular shape, a clamp for clamping the square sheet. A mechanism, a vertically movable arcuate cutter that cuts the square sheet, and a rotation mechanism that rotates the cut sheet by a predetermined angle, and the square sheet is rotated each time the rotation mechanism rotates. By being configured to cut with the arcuate blade, a pseudo circular sheet is punched and formed. Here, “paper” refers to paper, paperboard, and the like, and “synthetic resin sheet” refers to a film, a plastic sheet, and the like.

  In the rounding device according to the present invention, it is preferable that the clamp mechanism is an air cylinder and the rotation mechanism is a geared motor. This improves work efficiency.

  The rounding device according to the present invention includes one in which the mechanism for moving the arcuate blade up and down is constituted by any one of a hydraulic cylinder, an air cylinder, and a crank structure.

  The rounding device according to the present invention includes one in which the arcuate cutter is a linear cutter piece or a cutter piece created by bending a linear cutter into an arc shape with a press or the like. This improves the work efficiency of polishing a worn blade piece without the need for a grindstone with a special mechanism.

  The rounding device according to the present invention preferably uses an arcuate cutting tool formed by joining a plurality of cutting tool pieces that are linearly or bent in an arcuate shape with a width of 5 to 500 mm. As a result, the work efficiency of polishing a worn blade piece can be improved and the cost can be reduced without requiring a heavy press machine or a grindstone with a special mechanism.

  The rounding device according to the present invention is preferably provided with a mechanism for cutting the cut scraps obtained by cutting the corners of the rectangular sheet onto a conveyor belt conveyor by a scraping device and transporting the scraps to the outside. This improves work efficiency.

  In the round punching device according to the present invention, a series of operations of carrying the rectangular sheet before cutting into the machine, positioning, clamping, cutting, rotating, cutting, releasing the clamp, and carrying out the punched circular sheet is automatically advanced by computer control. Including. This improves work efficiency.

  According to the rounding device according to the present invention, it is possible to realize automation and efficiency, and at the same time, improve the cut edge accuracy and quality of a circular sheet.

It is the top view and side view which show the conventional rotary rounding device. It is the top view and side view which show the conventional press-type round punching apparatus. It is a figure which shows an example of a winding packaging form. It is the top view and side view of the rounding device by this invention. It is a figure which shows the shape of an arc-shaped blade. It is a figure which shows an example of the pseudo | simulation circular sheet | seat cut with the rounding apparatus which concerns on this invention. It is a figure which shows the other example of the pseudo | simulation circular sheet | seat cut with the rounding apparatus which concerns on this invention.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

  The rounding device according to the present embodiment will be described in detail with reference to FIG. This apparatus has been developed in order to process the above-described inner and outer papers more efficiently than the known prior art. The arcuate blade (4-E) is an arcuate blade that can be said to be a key point of the present invention, and moves up and down with a constant stroke by the mechanism of the press device (4-H). The press apparatus (4-H) can apply a known technique of a machine that cuts a paper or a film generally called guillotine or a press used for metal press molding.

  The object to be cut (4-A) held on the air table (4-B), that is, a square sheet is processed into a square corresponding to the diameter of a circular punched product required in advance and can be cut. Supplied in a stacked state. Processing into a square is obtained by cutting a roll of paper produced by a paper machine into a sheet using a push-type synchro cutter or rotary cutter, and these processes have been developed and established technically. In the paper industry, extremely general technology can be applied and processing efficiency is satisfactory. The rectangular sheet (4-A) supplied in a stackable number of sheets is the upper and lower two sheets of the clamping device (upper) (4-C upper) and the clamping device (lower) (4-C lower). Are clamped and held by a set of clamping devices which are disk-like structures.

  The clamping mechanism is performed by an air cylinder (4-D), but other generally known clamping mechanisms may be employed depending on the case. The clamp disk of the clamp device (below) (below 4-C) is rotated at a predetermined angle by a pre-programmed step by a reduction gear / motor with brake (4-F), that is, a geared motor. In general, this fixed angle is set to 90 degrees, and the four corners of the quadrilateral are pressed into an arc shape four times and dropped, but in some cases, 45 degrees of rotation is sandwiched in part, and then pressed four more times to pop out. It is also possible to manufacture a sheet that is closer to a circle by dropping the cut portion (ie, cutting 8 times).

  FIG. 5 shows a detailed view for explaining the arcuate blade (4-E) in more detail. In this drawing, an arcuate blade having a length of 90 degrees and a diameter of 1350 mm is shown as an example. This figure is an example, and blades of various diameters and lengths can be formed and used according to the size of the pseudo-circular sheet to be cut. The arcuate blade (4-E) is a combination of a straight blade piece (5-A), with the joined portions of each piece being finished with high precision, and a blade attachment bracket (5) by means of a blade attachment bolt (5-B). It is attached to the cutting machine main body which moves up and down by a press mechanism via -C). The size of the blade piece (5-A) can be arbitrarily selected and created depending on the size of the blade to be molded and the required quality of the pseudo-circular sheet to be obtained. The smaller the width of the blade piece, the more the pseudo-circular sheet closer to the circle can be obtained.

  Although the width of the blade piece can be 5 to 500 mm, generally 25 to 250 mm, more preferably 50 to 100 mm is recommended for cutting out a pseudo circle having a diameter of about 1 m.

  As described above, the blade piece can be disassembled after use and polished as a flat blade without using a special polishing tool in the same manner as a normal linear blade with a general polishing machine. The use of a blade that is arcuate by combining this linear blade piece is one of the elements constituting the basis of the present invention, but this arcuate blade is not formed with a linear blade piece, Even if it uses a cutter manufactured by bending in an arc shape from the beginning and using it for a cutting machine, it does not impair the requirements of the present invention.

  The complete clamping mechanism according to the present invention is equipped with a slide mechanism so that the distance between the center of the clamping device and the arcuate blade (4-E) can be determined according to the diameter of the circular sheet to be cut. ing. Further, the cutting scraps at the four corners of the quadrangular sheet punched with the arcuate cutting tool (4-E) are pushed out by the cutting scraping device (4-G) or the cutting edge angle of the arcuate cutting tool (4-E). Then, it is placed on the conveyor belt conveyor (4-I) and collected in the cutting waste box (4-J).

  In general, the cutting operation using the rounding device according to the present invention proceeds in the following procedure. The operator slides the upper clamp unit in which the upper clamp device (4-C) and the air cylinder (4-D) are integrated with a manual handle according to the diameter of the punched circular sheet. At this time, the distance between the blade edge of the arcuate blade (4-E) and the center of the clamp device (4-C) is made to coincide with the radius of the punched circular sheet. Next, the lower clamp unit in which the lower clamping device (below 4-C) and the reduction gear / brake motor (4-F) are integrated is similarly slid with the manual handle. The centers of the upper and lower clamping devices need to coincide. Positioning for matching this can be performed with high accuracy by a known device that converts the rotation by the handle into a sliding distance and a position detection sensor. Next, a material to be cut (4-A), which is a rectangular sheet stacked in a number that can be cut, is introduced into the rounding device of the present invention so as to slide the air table.

  The rectangular sheet (4-A) (hereinafter referred to as “cut sheet” or “cut object”) may be described so as to abut against a positioning plate provided as necessary to assist positioning. Set the center of the correct clamp. If the cutting start button is pressed, after the sheet to be cut is clamped by the clamping device, the arcuate blade (4-E) is lowered, and one square corner is cut into an arcuate shape. The cutting waste cut off at that time is discharged to the cutting waste box (4-J) via the rear conveyor belt conveyor (4-I). Next, after the arcuate blade is lifted, the rotation mechanism is operated, and the cut sheet is rotated 90 degrees. Since the new square corner is set under the arcuate blade, the arcuate blade is lowered and the second corner is dropped into the arcuate shape. Furthermore, a pseudo-circular sheet with four corners cut is obtained by rotating twice and lowering the arcuate blade. The operator completes a series of operations by taking out the completed pseudo-circular sheet.

  The above procedure shows the most basic semi-automatic cutting apparatus. However, if necessary, the positioning of the clamp unit can be automatically set by NC (Numerical Control), the introduction of a rectangular cut sheet, It is possible to automatically carry out the completed pseudo-circular sheet by computer control by applying a known guillotine cutting automation technique.

  Further, the advantages of the present invention will be described with reference to examples. FIG. 6 shows a pseudo circular sheet cut by the apparatus according to the present invention. This example shows a sheet shape obtained by cutting a 750 × 750 mm square sheet four times with a 90-degree arcuate blade having a diameter of 1350 mm. In this way, by installing an arc-shaped blade having a diameter of 1350 mm, a circular sheet having a diameter of 1350 mm can be punched without changing the blade, and the distance setting between the arc-shaped blade and the rotation center can be changed to obtain a rectangular shape. It is possible to cut a circular sheet having a diameter of 750 mm only by changing the size of the cut sheet. As shown in the figure, the punched sheet has only 19 mountains with a height of 19 mm compared to the perfect circle, and this degree of swelling is not an obstacle for this application. Never become. Thus, the ability to cut pseudo-circular sheets having various diameters without replacing the blades is a major technical advance that has not been achieved so far, and is a feature of the present invention.

  Further, the advantages of the present invention will be described with reference to FIG. The case shown in FIG. 7 shows an example in which a pseudo-circular sheet having a diameter of 750 mm is extracted from a square sheet having a diameter of 900 mm × 900 mm by using an arc-shaped blade having a diameter of 1350 mm as in the above example. In this case, there are four ridges having a height of about 53 mm as compared with the locus of a perfect circle. If this bulge of about 53 mm becomes an obstacle when used, it is almost impossible to remove the pseudo-circular sheet after cutting, rotate it 45 degrees, set it again, start the cutting cycle again and cut the ledge. A pseudo circular sheet close to a perfect circle can be obtained. Of course, in this example, the sheet area loss is large and the work is complicated, so it is not performed frequently, but application work that was not possible with the prior art is also possible, so the scope of application of the present invention is wide. This is a good example.

Using the rounding device shown in FIG. 4 and described in detail in the following section, which was designed and manufactured according to the present invention, an operation of punching a 1 m × 1 m square liner into a pseudo circle was performed. The liner used was one having a basis weight of 170 g / m ² and used for externally wound paper for winding and packaging. The arc-shaped blade was used by cutting a cutting blade, which is generally used in a device called guillotine, which cuts paper and the like by vertical movement into pieces with a width of 50 mm (cutlery piece) into an arc shape with high accuracy. . The curvature of the arcuate blade was equivalent to a diameter of 1050 mm, and the length was an arc corresponding to 90 degrees. This is achieved by using an arc-shaped blade that is slightly larger than the circle to be cut, so that the cutting waste is not separated and does not become the resistance of cutting, and the cutting waste is easily discharged out of the system. Because. In order to match the conditions with the comparative example, the rectangular sheet was manually supplied without using the automatic paper feeder, the operator performed positioning and the like, and the removal operation was also performed manually.

  The cutting operation proceeded smoothly, and the square sheet corner was cut by a combination of three 90 ° rotations and four arcuate blade lowerings to obtain a substantially circular sheet. The cutting waste escapes backward in the form of being pushed by the inclination of the cutting edge, and the resistance of the cutting edge is reduced, so that it was possible to carry out the stacking of the cut objects up to 100 per time without any problems. Further, the cutting waste was pushed rearward, and was carried out to the cutting waste box on a conveyor belt conveyor for discharging the waste. The number of processed sheets after 1 hour was about 12,000 sheets.

Comparative Example 1

The working efficiency in the case of using the “arm rotary round punching device” shown in FIG. 1, which is generally widely used as a comparative example, is shown. As in the example, a 1 m × 1 m 170 g / m ² liner was used. The work was carried out by one worker, and after the paper was cut into a circular shape, the cutting waste around the paper was removed, and the removal of the rounded paper was repeated. The number of stacked cut objects per time was 10 to 20 sheets. The rotation of the arm when cutting 10 sheets required 5 times, and the rate of the rounding work with this apparatus became the rate-limiting process, and 1600 sheets were finally processed in 1 hour.

Comparative Example 2

Next, a comparative example using the “press type punching device” shown in FIG. 2 will be shown. This circular blade is an application of the “punch blade” technology of a device called “bic punch” that is generally used when punching cardboard or paper containers. The punching blade is designed to be relatively lightweight, and can be cut or bent according to the shape of the paper container to be pulled out. This punching blade (2-A) cut into a circumferential length was made into a cylindrical shape, and was embedded in a circular shape in a groove on a plate plane that was moved up and down by a hydraulic cylinder. By lowering the punching blade, the circular sheet can be pulled out at once. The work was performed using a square liner of 170 g / m ² at 1 m × 1 m as in the example. In the same manner as in Comparative Example 1, one worker was allowed to feed and take out paper. Due to the lightweight design of the punching blade, the maximum number of sheets to be cut per stack was ten. The unloading operation itself was fast, and about 1200 sheets could be processed in one hour.

Comparative Example 3

  An example is shown in which the same “press-type round punching device” as in Comparative Example 2 is mounted with a strong circular cutter that has been pre-quenched and manufactured instead of the “punch blade” with a vacuum. The circular blade was a special blade that was formed into a circular shape and then subjected to blade cutting and quenching, and was polished using a special jig. When the operation was advanced in the same manner as in Comparative Example 2, the blades were strong, and the number of stacked objects to be cut could be up to 50 per time. The cutting speed was the same as in Comparative Example 2, and 6000 sheets could be removed per hour. However, in this case, it took about 1 hour for the blades to be replaced by two workers, and the overall efficiency was reduced.

  Table 1 shows a summary of the working efficiencies of Examples and Comparative Examples 1, 2, and 3. As shown here, it can be seen that the present invention is remarkably superior both in the number of stacked cut objects per time and the number of sheets cut out per hour. Furthermore, in the present invention, the cutting waste is automatically carried out of the system via the conveyor belt conveyor, so that a great difference occurs in the degree of fatigue of the worker. In addition, the efficiency was improved overall and the economy was excellent.

1-A Clamp Device 1-B Swing Arm 1-C Cutter Knife 1-D Swing Arm Drive Motor 1-E Table 1-F Operation Switch 1-G Back Switch 1-H Side Guide 1-I Control Panel 2-A Circular blade 2-B Hydraulic cylinder 2-C Table 2-D Press device 2-E Safety sensor 2-F Circular blade mounting groove 2-G Press device control panel 3-A Take-up packaging vane 3-B Take-up product 3-C Body surface one-pump packaging 3-D Slip paper (onep)
3-E Inserted inner paper 3-F Ear folded fold 3-G Outer paper (liner)
3-H Finished product packaging 4-A Cut object 4-B Air table 4-C Upper Clamp device (Up)
4-C bottom Clamp device (bottom)
4-D Air cylinder 4-E Arc-shaped blade 4-F Reducer / brake motor 4-G Cutting scraping device 4-H Press device 4-I Conveyor belt conveyor 4-J Cutting waste box 4-K Safety sensor 5 -A Cutter piece 5-B Cutter installation bolt 5-C Cutter installation bracket

Claims (6)

In a rounding device that punches a square sheet of paper or synthetic resin into a circular shape,
A clamping mechanism for clamping the rectangular sheet;
An arcuate cutter capable of moving up and down to cut the rectangular sheet;
A rounding device comprising: a rotating mechanism that rotates the cut sheet by a predetermined angle; and the rectangular sheet is cut by the arcuate blade every time the rotating mechanism rotates.   The rounding device according to claim 1, wherein the clamp mechanism is an air cylinder, and the rotation mechanism is a geared motor.   The rounding device according to claim 1 or 2, wherein the mechanism for raising and lowering the arcuate blade is configured by any one of a hydraulic cylinder, an air cylinder, and a crank structure.   The arcuate blade is formed by joining a plurality of blade pieces formed by bending the arcuate blade in a linear shape having a width of 5 to 500 mm or in an arc shape. The rounding device according to item.   The rounding device according to any one of claims 1 to 4, further comprising a mechanism for placing cutting scraps obtained by cutting a corner of the rectangular sheet on a conveyor belt conveyor by a scraping device and transporting the scrap to the outside of the device. .   A series of operations of carrying the rectangular sheet before cutting into the machine, positioning, clamping, cutting, rotating, cutting, releasing the clamp, and carrying out the punched circular sheet are configured to automatically proceed by computer control. Item 6. The rounding device according to any one of Items 1 to 5.

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