Automatic bending machine and cutting tool used for the same

Abstract

To provide an improved invention of a claw of an automatic bending machine in which a tip of a pre-nick does not open, and a blade of a taking-up pre-nick of a micro-nick.SOLUTION: Provided is a program in which, in an automatic bending machine, when a micro-nick / pre-nick / coil blade 34 is used, if a pre-micro-nick blade part 331 encounters arc bending, the bending work is passed and another bending piece is performed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to cutting tools for paper containers and automatic bending machines for bending the cutting tools. [Background technology]

[0002] Currently, the paper carton die 4 is made by cutting two grooves (0.72 mm wide) into plywood 41 using a CO2 laser cutter, into which blades 3 bent by an automatic bending machine are inserted. Figure 2 is a plan view of an example die 4. This is a popular box called a "straight tuck carton." The upper right corner of the drawing has been omitted to illustrate one side. The layout is a "two-blade layout." A 6mm-wide waste gap 36 is present between each side. The die is set in the punching machine and punches out the printed paperboard transported by chain. After the punching process, the product blank is transported to the next strip section or onto a pallet. At this time, nicks called U-shaped nicks 322 and V-shaped nicks 323 are made on the cutting edge 32 in Figure 3 to prevent the product blank from falling off the sheet. U-shaped nicks 322 are made using a diamond grinding wheel or wire discharge, which is expensive. V-shaped nicks 323 can be made with a sandstone. If the nick width at the cutting edge is 0.18 mm or less, it can be called a micronic. However, in any case, this is not possible with a handheld nicking machine. The "two-edged" case also expresses the groove 361 between the insert and the flap.

[0003] Nicks with a width of 0.3 mm leave a separation mark on the blank, which is unsightly to the consumer. To address this issue, Gregory Zimmer invented a method called micronics, which are smaller than 0.18 mm. This method is sold as "pre-nicks" or "invisible nicks" on a 970 mm long cutting tool with 0.18 mm wide nicks spaced at 1-inch (25.4 mm) intervals. However, this method presents problems. Not only is it expensive because the material is produced using wire electrical discharge, but it can only be bent using a manual bending machine. Because prenicks are used, it is possible to avoid the nicks when they occur in an arc. However, when bending with an automatic bending machine, prenicked blades cannot bend accurately if the nicks hit the arc (see Figure 6). If the radius is less than 5 mm, the cutting edge becomes polyline-shaped, which causes the cutting edge to open up at the nicked area. The blade body can accurately form an arc with the rotation of the claw between the claw and the shaft edge, but the cutting edge inclination 321 at the beveled part of the cutting edge does not meet the shaft edge 12 and the claw edge 211, so the bend remains and the blade opens. If the arc is 10 mm or more, the opening is not noticeable, but if the arc is 5 mm or less, the blade cannot be used. Micronics with nicks of 0.18 mm or less have other impressive features. With standard nicks of 0.3 mm, the blanks themselves must be removed from the punched product sheets stacked on a pallet. This is called stripping. The operator grabs the edge of 100 sheets with his left hand and, with a hammer held in his right hand, swings it down on the 0.3 mm nicks, cutting off all 100 sheets. This hard labor, known as "tataki" or "mushiri," is required. For orders over 500,000 passes, blanking dies can be manufactured, set into the die-cutting machine, and blanking can be automated. However, orders for 500,000 passes or more account for less than 3% of all die-cut jobs. Orders for 3,000 passes or less account for 50-60% of all die-cut jobs. Recently, hydraulic blanking machines have become popular. However, this process requires consumable plastic sheet materials, such as patterns. If you make the micronics 0.18mm or less, you can grab 100 sheets with your right hand, bend them, and easily cut the micronics, then grab 100 product blanks with your left hand. There's a big difference between 0.3mm and 0.18mm nicks. Here's a video and a recent magazine article I wrote that explains the difference: (micro nickel performance) https: / / www.youtube.com / watch?v=rwj45QZL11M C&B Magazine April 2024 Issue "Micronic improves punching speed by 30-40%"

[0004] Furthermore, even current automatic bending machines worldwide have one problem: when bending an arc of 10R or less, the cutting edge 32 of the arc tends to bend outward relative to the blade body 33. The blade body 33 forms an accurate arc because the claw edge 211 contacts it. Otherwise, it would not be able to be inserted into the 0.72 groove laser-cut into the plywood. The bending of the cutting edge 321, approximately 1 mm from the cutting edge of the arc, was not taken into consideration when manufacturing the cutting die. However, when this cutting die is placed in a punching machine and punched, the arc of 5R or less is bent outward and is therefore lower. This area cannot be punched completely. As a result, a process called "blunting and leveling" is required. "blunting tape" is affixed to "blunting paper / paper with a cutter drawing or blade mark transferred" and test cutting is repeated until the cut is completely punched. During this time, the punching machine is disabled. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] USP5537905 Summary of the Invention [Problem to be solved by the invention]

[0006] Figure 5 shows a typical "bending tool" for an automatic bending machine. This will be explained using Figure 1 of the present invention drawings. Figure 1 is a diagram of a shaft 1 and claws 2. Claws 2 rotate around a fixed shaft 1, and at the center of shaft 1 is a shaft groove 11 through which blade 3 (filled cross-sectional view) passes. To create an arc, claw edge 211 strikes blade side wall 31 of blade 3 and bends it. Once bent to the specified angle, claw 2 returns to its original standby position. Blade 3 is advanced by a feed roller (not shown). This process is repeated to form an arc. For a 2R, a feed of approximately 0.7 mm is repeated five times. While the data shows a "collection of polylines / continuous straight lines," the actual blade will form an arc, making it suitable for practical use. However, while the blade sidewall 31, where the claw edge 211 directly contacts, can faithfully form an arc, the cutting edge 32, which does not come into contact with the claw edge 211, forms an arc following the body of the blade 3, but the arc at the cutting edge 32 tends to diverge outward. As a result, the overall height of the arc cutting edge 32 is lower than the other straight, unbent sections. In extreme cases, it can be as low as 0.1 mm. As a result, the sheet cannot be punched accurately. To remedy this, the punching operator performs a process called "muratori." To raise the blade height in the areas not punched out during the test cut, muratori tape is applied to the lower parts of the muratori sheet (the sheet inserted behind the die). A piece of cellophane tape is 0.07 mm thick. This tape can also be applied. The muratori process involves repeating test cuts and muratori tape calibration until the overall blade height is equal. Therefore, in order to reduce the amount of work required for bending, it was the desire of the cutting die industry to bend the cutting edge 32 in the same way as the body when bending the arc.

[0007] Furthermore, when bending the prenicks of [Patent Document 1] USP 5,537,905 with an automatic bending machine, if an arc comes into contact with the nick, the cutting edge will open up as shown in Figure 6. The prenic blades of [Patent Document 1] USP 5,537,905 could not be bent with an automatic bending machine. The only way to bend the arc was to use a manual bending machine, avoiding the prenicked area. Automatic bending machines no longer bend standard lengths of 970 mm. The use of 100 m coil blades has become essential. The objective of this invention is to invent a prenic coil blade for 100 m long prenicks, and to prevent the situation shown in Figure 6 from occurring when an automatic bending machine using this blade bends the nick. As I wrote in my magazine article above, Mycronic has the following purposes, functions, and effects: "invisible nicks," "30-40% increase in punching speed," and "reduction of slavish stripping work" in paper container products. Generally, micronics refer to nicks with a width of 0.18 mm or less. At 0.2 mm, the nicks are visible to consumers and are cosmetically unsightly. However, it is impossible to create these nicks with a manual nicking machine. Hands shake, and even using a 0.13 mm thick grinding stone will result in a nicked area of ​​0.2 mm or more. Furthermore, because the nicks are so thin, they can easily fly off if you're not careful. The prenicked blade described in [Patent Document 1] USP 5537905 was devised to prevent this. However, the prenicked blade poses the problem of encountering arcs. The present invention aims to improve the claws of an automatic bending machine to prevent the blade tip of the prinic from opening, as shown in Figure 6, and to provide a micronic winding prinic blade. The present invention aims to popularize what was invented 30 years ago (Patent Document 1, USP 5,537,905) but was not widely adopted. And it aims to save the "hand-stripping" work, a slave-like labor that remains around the world. Another object of the invention is to speed up the punching process by 30%. Also, invisible nicks provide a cosmetic effect.

[0008] The claw protrusion 212 is provided on the upper part of the claw edge 211 and contacts the inclined cutting edge surface of the cutting edge 32 in synchronization with the claw edge 211. When the claw 2 rotates, the claw edge 211 contacts the blade side wall 31 and at the same time the claw protrusion 212 contacts the inclined cutting edge surface 321. As a result, the arc of the cutting edge can be bent in synchronization with the blade body 33. Generally, nicks are only made on the straight line portion of the cutting edge 3 of the die 4. They are never made on arcs. However, as an exception, when the outer periphery is made up of arcs only, such as in a display, nicks are made on large arcs. Nicks are also made on punches (round blades). Also, in Figure 2, there is a visible straight line 35 where nicks must not be made. It is shown as a "bold line" in Figure 2. This is the part that will be seen by the consumer when the contents are placed in this package and assembled. Visible straight lines 35 are usually not allowed to be made if they are more than 0.3 mm wide because they are unsightly. Micronics of 0.18 mm or less are "invisible" even if made, so they can be made. This is the reason why micronics are necessary. The cutting edges 3 other than the visible straight lines 35 are not seen by the consumer once packaged, so 0.3 mm nicks can be made. Furthermore, if no nicks are made on the visible straight line 35 with this layout, after punching, when the workpiece is transferred to the next process, the 6 mm gap in the waste, commonly known as the dimple 36, will rise up and jam inside the machine, forcing it to make an emergency stop. Even a punching machine with a catalog value of 9000 shots / H punches at 5000-6000 shots / H. If invisible micronics are made on the visible straight line 35, they will not rise up during transfer, making it possible to punch at 9000 shots / H. Using micronics increases punching speed by 30-40%.

[0009] The shape of the claw protrusion 212 is not limited to the triangular shape shown in the figure, and various other embodiments are possible, as long as the claw protrusion 212 hits the cutting edge slope 321 in sync with the claw edge 211. Any shape, such as a point, line, or surface, will do as long as it hits partially. It is not necessary for it to hit the entire cutting edge slope 321. Furthermore, if the blade height or blade angle is different, the claw protrusion 212 does not need to fit perfectly with the cutting edge slope 321; as long as it hits partially, there is no need to replace the claw even if the blade height or blade angle changes.

[0010] [Patent Document 1] USP 5,537,905 only offers a standard length of 970 mm for wire EDM, making it unsuitable for automatic bending machines. Therefore, we propose a 100-meter-long Micronic-Prinic coil blade, as shown in Figure 4. Using this blade, the protrusions 212 prevent the Micronic section from bending outward even when it encounters an arc. The Micronic-Prinic coil blade, together with the protrusions 212, is an essential component of this invention. Micronic-Prinic coil blades can be manufactured using an automatic bending machine, using a 0.13 mm-thick grinding stone alone or three stones sandwiched between four 1 mm spacers. When a 0.13 mm-thick sand stone is lowered onto the cutting edge 32 at a constant speed, it initially forms a U-shape. However, as the thickness of the cutting edge slope 321 increases, cutting resistance increases, resulting in a V-cut, but this does not affect Micronic functionality.

[0011] As another example, when trying to bend a 100m Micronic Prinic Coil Blade 34, for example, "insertion ▲4▼" in Figure 7, the following "process" will be performed based on the dimension 53. TIFF2025155459000002.tif26152The above series of steps completes "insertion ▲4▼." 25 of these are produced. Unfortunately, when using a 100m Micronic Prinic Coil Blade 34, if the blade comes into contact with the arc portion and is bent as is, the cutting edge will open up. [Patent Document 1] USP5537905 states that for wire EDM with a standard length of 970mm, it is possible to bend the blade by hand, avoiding the nicked portion. However, this is not possible with the 100m Micronic Prinic Coil Blade 34. There are two ways to avoid this. One is to cut off the front end, rear end, or both of the bending edge to avoid the circular bend encountered by the Pri-Micronic cutting edge 331 when using the Micronic Prinic Coil Blade 34 in an automatic bending machine.

[0012] Another method is to skip the operation and select from the six types in Figure 7 those that do not encounter the nick portion 331 of the Micronic Prinic Coil blade and resume the operation. In this case, to manage completed and unfinished work, a table showing the six bending processes in Figure 7 is used in Figure 8. The first column, "Bending No.", is the "Figure 7 number of the blade to be bent." The second column, "Number of Faces," is registered as "25." The third column, "Bending Data," stores the "Procedure" for "Insert ▲4▼" above. Each processing step is performed by this program. The fourth column, "Remaining Bending," is registered as "25," but this is "deducted" as each piece is completed. When all columns in this column reach "0," all bending work is complete. It is also possible to combine this with the first method to calculate the "blade loss" in advance.

[0013] The width, number, and pitch of Micronic Prinic coil blades can be selected depending on the paperboard material. As shown in Figure 6, it is also possible to manufacture a set of three 0.13mm thick grinding wheels with four 1mm thick spacers. Micronic Prinic coil blades can be manufactured by moving the grinding wheels up and down above the coil feeder. In any case, even if you apply too much Micronic, there is no need to worry because it is an "invisible nic."

[0014] Since the present invention has the above configuration, a. By modifying the claw 2 of the existing automatic bending machine to the claw protrusion 212 and providing a pre-micronic coil blade, it is possible to provide a cutting die with micronics. This means that consumers will not see unsightly nicks. This is an "invisible nic." b. Micronics can be attached to the visible straight line 35, so the cut part of the visible straight line 35 does not lift up during transportation, which increases the punching speed by 30-40%. c. Micronic strips easily, eliminating the need for slavish hammering. d. At the arc portion and the right-angle bend portion, the cutting edge 32 is low and unevenness was necessary, but the effect of the claw projection 212 makes this unnecessary. e. When using the Micronic Prinic Coil Blade 34 in an automatic bending machine, when the Primic Micronic cutting edge 331 encounters a circular bend, loss can be minimized by programming the cutting edge of the front or rear of the blade so that it bends to avoid that area. Also, by simulation, it is possible to change the bend so that the circular bend is not encountered, thereby minimizing "waste blade." f. Micronic allows you to easily separate blanks from sheets by hand when separating blanks from punched material (called stripping or blanking). It is easy because it is Micronic, and there is no need to use a hammer or other tool. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 2 is a front view of the shaft and claws of the bending tool of the automatic bending machine of the present invention combined together. [Figure 2] Plan view of a "two-blade split die" for a typical straight sack box. [Figure 3] 1A and 1B are a front view and a cross-sectional view showing the shape of a micronic according to the present invention. [Figure 4] 1 is a perspective view of a portion of a micronic prinic coil blade 34 of the present invention. [Figure 5] A photo of the shaft and claws of the blade bending tool of an automatic bending machine. [Figure 6] An example of a defective cutting edge 32 with a bent arc section of Pre-Micronic. [Figure 7] 1 is a plan view of a bent portion 51 and its disassembled piece 52 in a die 4 with a total of 25 faces. [Figure 8] A table showing the six bending processes shown in Fig. 7. [Explanation of symbols]

[0016] Shaft 1 Shaft groove 11 Shaft Edge 12 Claw 2 Claw Edge 211 Nail protrusion 212 Blade 3 Ruled 30 Blade side wall 1 Cutting edge 32 Cutting edge inclination 321 L-shaped Nick 322 V-shaped Nick 323 Blade body 33 Nick part of Micronic, Prinic, Coil blade 331 Micronic Prinic Coil Blade 34 External visible straight line 35 Dob 36 Groove between insert and flap 361 curved blade 38 Cutting die 4 Plywood 41 1 page 5 Blade 51 excluding the ruled line 30 from the first surface 5 6 types of curved blades 52 "Insertion ▲4▼" dimension 53

Claims

1. When a Micronic Prinic coil blade 34 is used in an automatic bending machine, when a circular arc bend is encountered by a Primic Micronic blade part 331, the program cuts off the front end or rear end or both of the bent edge so as to avoid the part.

2. When a Micronic Prinic coil blade 34 is used in an automatic bending machine, when a circular arc bending is encountered in a Primic Micronic blade part 331, the program skips the bending work and performs another bending piece.

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