A method for punching out powder sealing material, and a die used in the method.

Abstract

To provide a method for punching out powder sealant that ensures the sealing performance of the powder sealant while improving yield, and a die used in this method. [Solution] A method for punching out powder seal material from a raw roll of powder seal material having cut pile fabric or the like by punching, wherein the die used in the punching process is equipped with only one type of cutting blade with a punching shape that does not have a closed region, and in N+1 punching steps, N pieces of the powder seal material are punched out adjacent to each other in a part of their respective contours, and the punching process is performed so that there are no double-punched areas between the preceding punching step and the subsequent punching step, and no cuts are made in the contours of the powder seal material, a method for punching out powder seal material, and a die used in the method.

Description

Technical Field

[0001] The present invention relates to a punching method for a powder sealing material and a punching die used in the method.

Background Art

[0002] There is known a powder sealing material for suppressing leakage of powder such as toner, which is manufactured by punching from a base fabric of a powder sealing material having cut pile fabric, cut pile knitted fabric, or felt. Patent Document 1 discloses a method for manufacturing a powder sealing material, characterized in that a base fabric of a powder sealing material is intermittently fed forward in sequence to a plurality of cutting blades shaped into different shapes, and formed into a sealing member having a predetermined shape through a plurality of cutting steps.

[0003] FIG. 9 is an explanatory diagram for explaining a punching die 2000 that punches a powder sealing material in one punching step. In the punching die 2000, a cutting blade 2100 having a closed region CLD along the contour shape of the powder sealing material with the punching shape as a boundary is provided on a base 20. In the punching process using the punching die 2000, after the punching step, debris such as fibers generated during cutting tends to remain in the closed region CLD. Therefore, there is a problem that the cleaning frequency of the punching die 2000 increases and the productivity of the powder sealing material decreases.

[0004] On the other hand, the punching die used in the manufacturing method of Patent Document 1 is provided with a plurality of cutting blades having a plurality of punching shapes obtained by dividing the contour shape of the powder sealing material. Therefore, there is no closed region CLD in the punching shape of the cutting blade of the punching die of Patent Document 1. As a result, debris hardly remains in the punching die of Patent Document 1, and the cleaning frequency decreases. As a result, according to the manufacturing method of Patent Document 1, the productivity of the powder sealing material can be improved.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] The present inventors, in the manufacturing method of Patent Document 1, performed a punching process (hereinafter referred to as "adjacent punching") in which the punched-out powder seal material is adjacent to other materials in a portion of its outline, in order to improve the yield. Figure 10 is an explanatory diagram of adjacent punching of powder seal material 4000 based on the manufacturing method of Patent Document 1. Figure 10 shows the punched lines 5000 that are punched out into the raw material of the powder seal material in each of the 1st to 4th punching processes. As shown in Figure 10, in the manufacturing method of Patent Document 1, if the gaps between the punched-out powder seal material 4000 are simply filled and adjacent punching of the powder seal material 4000 is performed, a double-cutting portion TSP occurs where the same place is cut twice by the cutting blade. A large amount of debris such as fibers is generated in the double-cutting portion TSP. Therefore, the frequency of cleaning the punching die increases, and there is a risk that the productivity of the powder seal material will decrease.

[0007] The powder sealant 4000 shown in Figure 10 is a powder sealant used to prevent toner leakage in electrophotographic image processing equipment such as photocopiers, laser beam printers, facsimile machines, and their combined devices. Some powder sealants used to prevent toner leakage have a narrow minimum width (MIW) (20 mm or less). Generally, cutting tolerances are considered in die-cutting processes. Therefore, as shown in the enlarged view of the third die-cutting process in Figure 10, the die-cutting process is set so that two die-cutting lines form an intersection (ITS) to suppress cutting defects due to cutting tolerances. As a result, as shown in Figure 10, a double-treaded portion (TSP) occurs at the end of the powder sealant 4000. This can cause defects at the end of the powder sealant 4000. End defects in powder sealants with a narrow minimum width (MIW) used to prevent toner leakage are likely to cause toner leakage and thus result in defective products. As a result, the defect rate may increase, potentially further reducing productivity.

[0008] To resolve the above-mentioned problem of edge defects, the inventors devised adjacent punching of the powder seal material 4100 shown in Figure 11 as a modified example of adjacent punching shown in Figure 10. The seal material 4100 is a powder seal material used to prevent toner leakage in an electrophotographic image processing device, having the same shape as the powder seal material 4000. Figure 11 shows the punched lines 5100 punched into the raw material of the powder seal material in each of the 1st to 4th punching processes. The adjacent punching in Figure 11 resolves the problem of edge defects. However, the adjacent punching in Figure 11 does not resolve the occurrence of double-punched portions (TSP). Furthermore, the notched SLT shown in the enlarged view of the second punching process in Figure 11 occurs in the area indicated by the dashed circle in Figure 11. In other words, in the adjacent punching in Figure 11, notched SLT occurs in all of the punched powder seal material 4100. In the narrow powder sealant 4100 with a minimum width MIW, the notches SLT can also cause toner leakage. Therefore, even with adjacent punching as shown in Figure 11, there was a risk that sealing performance could not be ensured. [Means for solving the problem]

[0009] The present invention relates to a method for punching out powder seal material from a raw material roll of cut pile fabric, cut pile knitted fabric, or felt by punching, wherein the die used in the punching process is equipped with only one type of cutting blade with a punching shape, the punching shape does not have a closed region as its boundary, N pieces of the powder seal material are punched out by N+1 punching steps (N is a natural number) using the die, in which the N+1 punching steps (N is a natural number) using the die, in which the multiple powder seal material pieces are punched adjacent to each other at a part of their respective contours, the punching steps do not result in a double-cut portion where the same place is cut twice by the cutting blade in the preceding punching step and the subsequent punching step, and no cuts are made in the contour of the powder seal material by the punching line of the subsequent punching step. [Effects of the Invention]

[0010] The present invention provides a method for punching out powder sealant that ensures the sealing performance of the powder sealant while improving yield. The present invention also provides a die used in the above-mentioned method for punching out powder sealant. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic diagram of a punching machine used in a punching method for powder sealing material according to an embodiment of the present invention. [Figure 2] Figure 2 is a conceptual perspective view of a die-cutting mold according to an embodiment of the present invention. [Figure 3] Figure 3 is a conceptual plan view of a die-cutting mold according to an embodiment of the present invention. [Figure 4] Figure 4 is a conceptual perspective view of a raw material used in a punching method for powder sealing material according to an embodiment of the present invention. [Figure 5] Figure 5 is an explanatory diagram of a method for punching out powder sealing material according to an embodiment of the present invention, using the die shown in Figure 2. [Figure 6] Figure 6 is an explanatory diagram of a modified example 1, which is a method for punching out powder sealing material according to an embodiment of the present invention. [Figure 7] Figure 7 is an explanatory diagram of a modified example 2, which is a method for punching out powder sealing material according to an embodiment of the present invention. [Figure 8] Figure 8 is an explanatory diagram of a modified example 3, which is a method for punching out powder sealing material according to an embodiment of the present invention. [Figure 9] Figure 9 is an explanatory diagram illustrating a die used to punch out powder sealing material in a single punching process. [Figure 10] Figure 10 is an explanatory diagram of adjacent punching of powder sealing material based on the manufacturing method described in Patent Document 1. [Figure 11] Figure 11 is an explanatory diagram illustrating an example of a modification to the adjacent punching shown in Figure 10. [Modes for carrying out the invention]

[0012] Hereinafter, based on preferred embodiments, the present invention will be described in detail with appropriate reference to the accompanying drawings. It should be noted that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0013] (1) One embodiment of the present invention is a method of punching a powder seal material from a base fabric of a powder seal material having a cut pile fabric, a cut pile knitted fabric, or felt by punching, wherein the punching die used in the punching process has only a cutting blade of one punching shape, the punching shape has no closed region bounded by it, N powder seal materials are punched by N + 1 punching steps (N is a natural number) using the punching die, in the punching steps where N is 2 or more, the plurality of powder seal materials are punched adjacent to each other at a part of their respective contours, the punching step is such that in the preceding punching step and the subsequent punching step following it, there is no double - punched portion where the same location is cut twice by the cutting blade, no notch is formed on the contour of the powder seal material by the punching line of the subsequent punching step.

[0014] (2) In the method of punching the powder seal material described in (1) above, in the preceding punching step, a first punching shape is punched into the base fabric, in the subsequent punching step, a second punching shape is punched into the base fabric, the closed region bounded by the first punching shape and the second punching shape is punched out as the powder seal material, the first punching shape and the second punching shape intersect at two locations on the boundary of the closed region, the ends of the punching line of the first punching shape and the punching line of the second punching shape are both located outside the closed region.

[0015] (3) In the method for punching out powder sealing material described in (1) or (2) above, The above punched shape is at least, The first punching line and, A second punched wire is connected to one side of the first punched wire in a T-shape or L-shape, A third punched wire is connected to the other side of the first punched wire in a T-shape or L-shape, Includes.

[0016] (4) In the method for punching out powder sealing material described in (3) above, The above punching process is at least, The first punching process involves punching out the above raw material in the above punched shape, A first progressive feeding process is performed to move the raw material after the first punching process described above a first distance in a first direction, The raw material after the first progressive feeding process described above is punched out in the punched shape described above in the second punching process, A second progressive feeding step involves moving the raw material after the second punching step described above by the first distance in the first direction, A third punching step is performed in which the raw material after the second progressive feeding step is punched out in the punched shape described above. Includes.

[0017] (5) In the method for punching out powder sealing material described in (4) above, The first powder sealing material is punched out in the first punching process and the second punching process described above. The second powder sealing material is punched out in the second punching process and the third punching process described above. The first powder sealing material and the second powder sealing material are adjacent to each other via a portion of the first punching line of the second punching process.

[0018] (6) In the method for punching out powder sealing material described in (5) above, The contour shape of the first powder sealing material described above includes the first punching line of the first punching process, the third punching line of the first punching process, the first punching line of the second punching process, and the second punching line of the second punching process. The contour shape of the second powder sealing material described above includes the first punching line of the second punching process, the third punching line of the second punching process, the first punching line of the third punching process, and the second punching line of the third punching process.

[0019] (7) In the method for punching out powder sealing material described in (6) above, The first punched lines mentioned above are parallel to each other. The ends of the first punched line, the second punched line, and the third punched line are all located outside the closed region.

[0020] According to the method of punching out the powder sealant described in any of (1) to (7) above, it is possible to improve the yield while ensuring the sealing performance of the punched-out powder sealant.

[0021] (8) In the method for punching out powder sealing material described in any of (1) to (7) above, The above-mentioned die is equipped with multiple cutting blades, Each of the multiple cutting blades is positioned in the die in a location that does not overlap in the first direction.

[0022] (9) In the method for punching out powder sealing material described in (8) above, each of the plurality of cutting blades is arranged in the die at a distance of a second distance in a second direction perpendicular to the first direction.

[0023] (10) In the method for punching out powder sealing material described in (9) above, each of the multiple cutting blades is positioned in the die at a position that overlaps in the second direction.

[0024] According to the method of punching out powder seal material described in any of (8) to (10) above, multiple rows of powder seal material can be punched out into the raw material roll of powder seal material by the punching process. Therefore, the productivity of powder seal material is improved.

[0025] (11) In the method for punching out powder sealant described in any of (1) to (10) above, the powder sealant is a powder sealant used to prevent toner leakage in an electrophotographic image processing device.

[0026] The method for punching out powder sealing materials according to the present invention is particularly suitable for punching out powder sealing materials used to prevent toner leakage in electrophotographic image processing equipment.

[0027] (12) Another embodiment of the present invention is the die used in the method for punching out powder sealing material described in any of (1) to (11) above.

[0028] The die described in (12) above can be applied to a method for punching out powder sealant that ensures the sealing performance of the punched-out powder sealant while improving yield.

[0029] [Basic configuration of a punching machine] Figure 1 is a schematic diagram of a punching machine 1 used in a method for punching powder sealant according to an embodiment of the present invention. The punching machine used in the method for punching powder sealant according to the present invention may be any known punching machine applicable to the punching process of powder sealant, and is not particularly limited. The punching machine 1 comprises a lifting platform 10 on which a die 2 is detachably mounted, and a base 11 on which a roll of material 3 is placed.

[0030] The die 2 comprises a base 20 and a cutting blade 21. The raw material roll 3 is moved intermittently on the base 11 by a winding device (not shown) in the first direction indicated by the arrow in Figure 1, at a first distance FDI, which will be described later. When the movement of the raw material roll 3 on the base 11 stops, the lifting platform 10 on which the die 2 is mounted descends, and the raw material roll 3 is punched out in the shape of the cutting blade 21. After the punching of the raw material roll 3 is complete, the lifting platform 10 rises, and the raw material roll 3 moves a first distance FDI in the first direction.

[0031] As described above, the raw material 3 moves intermittently in the first direction while being punched out by the cutting blade 21 of the die 2. Therefore, the region AAP of the raw material 3 located on the side of the cutting position of the cutting blade 21 in the first direction becomes the region after punching. Conversely, the region ABP of the raw material 3 located on the opposite side of the cutting position of the cutting blade 21 in the first direction becomes the region before punching. Note that the raw material 3 at the cutting position of the cutting blade 21 can be in either the pre-punching or post-punching state.

[0032] [Basic components of a cookie cutter] Figure 2 is a conceptual perspective view of a die 2 according to an embodiment of the present invention. Figure 3 is a conceptual plan view of a die 2 according to an embodiment of the present invention. The die 2 comprises a base 20 and a cutting blade 21. The die 2 is equipped with three cutting blades 21 having the same punching shape. That is, the die 2 is equipped with only one type of cutting blade 21 with a punching shape. Furthermore, unlike the cutting blade 2100 in Figure 9, the cutting blade 21 does not have a closed region CLD with the punching shape as the boundary. Therefore, the die 2 is less likely to leave behind debris such as fibers generated during cutting, and the frequency of cleaning is reduced. This makes it possible to improve the productivity of the powder sealing material 4 described later. The die of the die in the present invention can be any type that is applicable to the punching process of the raw material of the powder sealing material, such as a Thomson die or an engraving die. In the die 2, a Thomson die type cutting blade 21 is used.

[0033] When the die 2 is mounted on the lifting platform 10, the three cutting blades 21 are positioned in the die 2 in a way that they do not overlap in the first direction of movement of the raw material 3. In this embodiment, the three cutting blades 21 are each positioned in a second direction perpendicular to the first direction, with a second distance SDI between them. In addition, the three cutting blades 21 are each positioned in a way that they overlap in the second direction in the die 2. The second distance SDI can be set appropriately considering the size of the die and cutting blades, as well as the cutting tolerances.

[0034] [Basic composition of the raw material] Figure 4 is a conceptual perspective view of a raw material roll 3 used in a punching method for a powder seal material 4 according to an embodiment of the present invention. Figure 4 shows the state of the raw material roll 3 in region ABP before punching by the die 2 and in region AAP after punching. The raw material roll 3 in this embodiment is a raw material roll of a powder seal material having a cut pile fabric, comprising a cut pile fabric 31 and a support portion 32. The raw material roll of the present invention is not limited to a raw material roll of a powder seal material having a cut pile fabric, but may also be a raw material roll of a powder seal material having a cut pile knit or felt.

[0035] As shown in region AAP in Figure 4, after punching with die 2, the powder sealant 4 is punched out of the raw material 3 as a closed region with punching lines 5 as boundaries. As shown in Figure 4, in region AAP of the raw material 3, the multiple powder sealants 4 arranged in the first direction are punched out adjacent to each other along a part of their respective contours. The support portion 32 in this embodiment has an adhesive layer with a film on the side opposite to the side where the cut pile fabric 31 is located. In the punching process with die 2, the powder sealant 4 is punched out by half-cutting, leaving the film intact. The powder sealant 4 is a powder sealant used to prevent toner leakage in an electrophotographic image processing device.

[0036] As described above, the die 2 is equipped with three cutting blades 21 arranged in the second direction at intervals of the second distance SDI. Therefore, the powder sealant 4 arranged in three rows in the second direction is punched out of the raw material 3 in region AAP. In addition, the punching lines 5 arranged in the second direction are each cut out at intervals of at least the second distance SDI. Therefore, the punching lines 5 punched out in one row do not intersect with the punching lines 5 punched out in the other row. This prevents the occurrence of cuts SLT in the powder sealant 4 punched out in one row by the punching lines 5 punched out in the other row. Thus, the sealing performance of the punched powder sealant is ensured. Furthermore, it is possible to prevent the formation of closed regions in region AAP with the punching lines 5 punched out in one row and the punching lines 5 punched out in the other row as boundaries. Therefore, in region AAP, the closed region bounded by the punching line 5 consists only of the powder sealant 4. This prevents the generation of waste from cut-out fragments other than the powder sealant 4. As a result, the work efficiency when removing the powder sealant 4 from the raw material 3 after punching is improved.

[0037] [Method for punching out powder sealant] Figure 5 is an explanatory diagram of a method for punching out powder sealant 4 according to an embodiment of the present invention, using the die 2 shown in Figure 2. In the method for punching out powder sealant 4 of this embodiment, the powder sealant 4 is punched out by repeating the punching process of the die 2 into the raw material 3 in the punching machine 1 and the sequential feeding process of moving the raw material 3 in the first direction by the winding device described above by a first distance FDI. Figure 5 shows the state of the punched lines 5 punched into the raw material 3 by one cutting blade 21 in each of the 1st to 4th punching processes into the raw material 3 by the die 2. As shown in Figure 5, in one punching process by the die 2, a punched shape is punched into the raw material 3 consisting of a first punched line 51, a second punched line 52 connected in a T-shape to one side of the first punched line 51, and a third punched line 53 connected in a T-shape to the other side of the first punched line 51. The minimum width MIW of the powder sealant 4 is 2 mm or more and 20 mm or less.

[0038] In the first punching process, the first punched shape 5a is punched out of the raw material 3. The first punched shape 5a consists of a first punching line 51a, a second punching line 52a, and a third punching line 53a. In the second punching process, the second punched shape 5b is punched out of the raw material 3. The second punched shape 5b consists of a first punching line 51b, a second punching line 52b, and a third punching line 53b. In the third punching process, the third punched shape 5c is punched out of the raw material 3. The third punched shape 5c consists of a first punching line 51c, a second punching line 52c, and a third punching line 53c. In the fourth punching process, the fourth punched shape 5d is punched out of the raw material 3. The fourth punched shape 5d consists of a first punched line 51d, a second punched line 52d, and a third punched line 53d. The first punched line 51, consisting of the first punched line 51a, first punched line 51b, first punched line 51c, and first punched line 51d, is parallel to each other.

[0039] As shown in Figure 5, one sheet of powder sealant 4 is punched out in the second punching step, two sheets in the third punching step, and three sheets in the fourth punching step. In other words, in the punching method for powder sealant 4 of this embodiment, N sheets of powder sealant 4 are punched out by the die 2 in N+1 punching steps (where N is a natural number). As shown in the third punching step in Figure 5, the second sheet of powder sealant 4 punched out in the third punching step (hereinafter sometimes referred to as "second powder sealant 4") is adjacent to the first sheet of powder sealant 4 punched out in the second punching step (hereinafter sometimes referred to as "first powder sealant 4") at a portion of the first punching line 51b, which has a common contour. As shown in the fourth punching step in Figure 5, the third powder seal material 4 (hereinafter sometimes referred to as "third powder seal material 4") punched out in the fourth punching step is adjacent to the second powder seal material 4 in part of the first punching line 51c, which has a common outline.

[0040] As described above, the punching method for the powder sealant 4 of this embodiment involves repeating a punching step and a sequential feeding step. Therefore, the powder sealant 4 punched in the fourth and subsequent punching steps will be adjacent to the powder sealant 4 punched in the preceding punching steps at a portion of the first punching line 51, which has a common contour. In other words, in the punching steps from the third onward (when N is 2 or more), the multiple punched powder sealant 4 will be adjacent to each other at a portion of their respective contours, resulting in adjacent punching. Therefore, the punching process in the punching method for the powder sealant 4 of this embodiment includes at least the following steps. First punching process: The process of punching out the first punched shape 5a into the raw material 3. First progressive feeding process: A process of moving the raw material 3 after the first punching process a first distance FDI in a first direction. Second punching process: A process in which the second punched shape 5b is punched out into the raw material 3 after the first progressive feeding process. Second progressive feeding process: A process of moving the raw material 3 after the second punching process by a first distance FDI in the first direction. Third punching process: A process of punching out the third punched shape 5c into the raw material 3 after the second progressive feeding process.

[0041] Through the first punching process, first progressive feeding process, second punching process, second progressive feeding process, and third punching process described above, the two powder seal materials 4, the first powder seal material 4 and the second powder seal material 4, are punched adjacent to each other, improving the yield. From the third punching process onward, the progressive feeding process and the punching process are repeated, and the powder seal material 4 is punched adjacent to each other. Therefore, according to the punching method for powder seal material 4 of this embodiment, it is possible to improve the yield.

[0042] The first distance FDI is set to the distance at which the outline of the powder sealing material 4, which is a closed region bounded by the punching lines 5 punched into the raw material 3 in the preceding punching process and the punching lines 5 punched into the raw material 3 in the subsequent punching process, intersects at two locations A and B, indicated by dashed circles. As shown in the enlarged view A and B of Figure 5, intersection points ITS occur between the first punching line 51 punched into the raw material 3 in the preceding punching process and the second punching line 52 punched into the raw material 3 in the subsequent punching process, and between the third punching line 53 punched into the raw material 3 in the preceding punching process and the first punching line 51 punched into the raw material 3 in the subsequent punching process. More specifically, the intersection ITS of A is caused by the intersection of the first punching line 51a of the first punched shape 5a and the second punching line 52b of the second punched shape 5b, the intersection of the first punching line 51b of the second punched shape 5b and the second punching line 52c of the third punched shape 5c, and the intersection of the first punching line 51c of the third punched shape 5c and the second punching line 52d of the fourth punched shape 5d. The intersection ITS of B is caused by the intersection of the third punching line 53a of the first punched shape 5a and the first punching line 51b of the second punched shape 5b, the intersection of the third punching line 53b of the second punched shape 5b and the first punching line 51c of the third punched shape 5c, and the intersection of the third punching line 53c of the third punched shape 5c and the first punching line 51d of the fourth punched shape 5d.

[0043] As shown in the enlarged views A and B of Figure 5, the end EDGs of the first punched line 51 and the third punched line 53 punched into the raw material 3 in the preceding punching process, and the end EDGs of the second punched line 52 and the first punched line 51 punched into the raw material 3 in the subsequent punching process, are all located outside the closed region within the contour of the powder sealant 4. That is, as shown in Figure 5, all end EDGs of the punched lines 5 are located outside the closed region. More specifically, as shown in the fourth punching process in Figure 5, the end EDGs of the first punched shape 5a, the second punched shape 5b, the third punched shape 5c, and the fourth punched shape 5d are all located outside the closed region. As described above, the punching method for the powder sealant 4 in this embodiment involves repeating the punching process and the sequential feeding process. Therefore, the end EDGs of the punched lines 5 punched in the fourth and subsequent punching processes are also located outside the closed region. Therefore, according to the punching method for the powder sealant 4 of this embodiment, the SLT cut shown in Figure 11 does not occur. This ensures the sealing performance of the punched powder sealant 4.

[0044] As shown in the second punching step in Figure 5, the double-tread portion TSP shown in Figures 10 and 11 does not occur in the first punched shape 5a and the second punched shape 5b, which are punched in the first and second punching steps. Similarly, the double-tread portion TSP does not occur in the second punched shape 5b and the third punched shape 5c, and in the third punched shape 5c and the fourth punched shape 5d. As described above, the punching method for the powder seal material 4 of this embodiment involves repeating the punching step and the sequential feeding step. Therefore, the double-tread portion TSP does not occur in the punched shapes punched in the fourth and subsequent punching steps. In other words, in the punching method for the powder seal material 4 according to the embodiment of the present invention, the double-tread portion TSP does not occur in the preceding punching step and the subsequent punching step. This ensures the sealing performance of the punched powder seal material 4.

[0045] [Other methods for punching powder sealants] The present invention provides a method for punching out powder sealant, which involves adjacent punching of the powder sealant using a die equipped with only one type of cutting blade with a punching shape that does not have a closed region, so as not to produce a cut SLT and a double-tap TSP. Therefore, the present invention is not limited to the method for punching out powder sealant 4 using the die 2 described above. Below, modified examples 1 to 3 of the powder sealant punching method are described, which use a die equipped with a cutting blade that has a different punching shape from the cutting blade 21. Note that in the methods shown in modified examples 1 to 3, the same content as the method for punching out powder sealant 4 using the die 2 described above will be omitted from the explanation.

[0046] (Variation 1) Figure 6 is an explanatory diagram of a modified example 1, which is a method for punching out the powder sealant 41 according to an embodiment of the present invention. In the first punching step of Figure 6, punched lines 500 are shown punched out in the raw material 3 by the cutting blade of the die used in the method for punching out the powder sealant 41. The punched lines 500 consist of a first punched line 501, a second punched line 502 connected in an L-shape to one side of the first punched line 501, a third punched line 503 connected in an L-shape to the other side of the first punched line 501, a fourth punched line 504 connected in an L-shape to one side of the first punched line 501 at a different position from the second punched line 502, and a fifth punched line 505 connected in a T-shape to the other side of the first punched line 501.

[0047] Figure 6 shows the state of the punched lines 500 punched into the raw material 3 during the first and second punching processes. In the first punching process, the first punched shape 500a is punched into the raw material 3. The first punched shape 500a consists of a first punched line 501a, a second punched line 502a, a third punched line 503a, a fourth punched line 504a, and a fifth punched line 505a. In the second punching process, the second punched shape 500b is punched into the raw material 3. The first punched shape 500b consists of a first punched line 501b, a second punched line 502b, a third punched line 503b, a fourth punched line 504b, and a fifth punched line 505b.

[0048] In the punching method for the powder sealing material 41, the first distance FDI is set to the distance at which the punching lines 500 punched into the raw material 3 in the preceding punching process and the punching lines 500 punched into the raw material 3 in the subsequent punching process intersect at two locations, C and D, indicated by dashed circles. The intersection ITS at C is caused by the intersection of the fifth punching line 505 of the preceding punching process and the second punching line 502 of the subsequent punching process. The intersection ITS at D is caused by the intersection of the third punching line 503 of the preceding punching process and the fourth punching line 504 of the subsequent punching process.

[0049] The punching method for the powder sealant 41 is the same as the punching method for the powder sealant 4 described above, with the punching process and the sequential feeding process being repeated. Therefore, in the third and subsequent punching processes, adjacent punching is repeated, where the powder sealant 41 punched in the preceding punching process and the powder sealant 41 punched in the subsequent punching process are adjacent to a portion of the first punching line 501 punched in the preceding punching process. This improves the yield and increases the productivity of the powder sealant 41. Furthermore, as shown in the second punching process in Figure 6, no cut SLT and double-tread portion TSP occur in the punching method for the powder sealant 41 of Modified Example 1. Therefore, no cut SLT and double-tread portion TSP occur in the third and subsequent punching processes. Thus, the sealing performance of the punched powder sealant 41 is ensured.

[0050] The punching line 500 consists of five punching lines, from the first punching line 501 to the fifth punching line 505. Furthermore, the punching line 500 includes the bent fifth punching line 505. As a result, the powder sealant 41 punched out by the punching method for the powder sealant 41 has a more complex shape than the powder sealant 4. In other words, the punching method for powder sealant of the present invention makes it possible to punch out powder sealant with a complex shape by increasing the number of punching lines that constitute the punching shape of the cutting blade of the punching die and changing the shape.

[0051] (Modification 2) Figure 7 is an explanatory diagram of a modified example 2, which is a method for punching out the powder sealant 42 according to an embodiment of the present invention. The method for punching out the powder sealant 42 is a modification of the method for punching out the powder sealant 4 described above, in which the shapes of the second punching line 52 and the third punching line 53 are changed. More specifically, the second punching line 52 is changed to the second punching line 512, and the third punching line 53 is changed to the third punching line 513. The first punching line 51 and the first punching line 511 have the same straight shape.

[0052] In the punching method for the powder sealing material 42, the first distance FDI is set to the distance at which the punching lines 510 punched into the raw material 3 in the preceding punching process and the punching lines 510 punched into the raw material 3 in the subsequent punching process intersect at two locations, E and F, indicated by dashed circles. The intersection ITS at E is caused by the intersection of the first punching line 511 of the preceding punching process and the second punching line 512 of the subsequent punching process. The intersection ITS at F is caused by the intersection of the third punching line 513 of the preceding punching process and the first punching line 511 of the subsequent punching process.

[0053] As shown in the second punching step in Figure 7, the punching method for the powder sealant 42 does not result in cuts (SLT) or double-tapping (TSP). Furthermore, in the third and subsequent punching steps, the powder sealant 42 is punched adjacent to each other in a portion of the first punching line 511. Therefore, the punching method for the powder sealant 42 ensures the sealing performance of the punched powder sealant 42 and improves the yield.

[0054] (Variation 3) Figure 8 is an explanatory diagram of a modified example 3, which is a method for punching out a powder sealant 43 according to an embodiment of the present invention. As shown in the first punching step in Figure 8, the punching line 520 consists of a first punching line 521 and a second punching line 522 that intersect. The first distance FDI is set to the distance at which the two punching lines 520, which are punched out in the raw material 3 in the preceding and succeeding punching steps, intersect at two locations G and H, indicated by dashed circles.

[0055] As shown in Figure 8, the punching method for the powder sealant 43 is adjacent punching, where the powder sealant 43 is adjacent to the first punching line 521 and the second punching line 522 at the intersection of the punching line 520. Furthermore, this punching method for the powder sealant 43 does not produce a cut SLT or a double-tap TSP. Therefore, this punching method for the powder sealant 43 ensures the sealing performance of the punched powder sealant 43 and improves the yield.

[0056] [Note 1] The powder seal material punched out by the punching method for powder seal material according to the embodiments of the present invention described above is not limited to powder seal material used to prevent toner leakage in an electrophotographic image processing device. The punching method for powder seal material according to the embodiments of the present invention described above can also be applied, for example, to punching out powder seal material used to prevent chips, foreign matter, etc. from entering the sliding part of a slider.

[0057] [Note 2] In the method for punching powder sealing material according to the embodiment of the present invention described above, a sequential feeding step was described in which the raw material roll 3 moves a first distance FDI in a first direction on the base 11 of the punching machine 1 by a winding device. However, in the sequential feeding step of the method for punching powder sealing material according to the present invention, it is sufficient for the raw material roll and the punching die to move a first distance FDI relative to each other. Therefore, for example, the position of the raw material roll can be fixed, and the punching die can be moved a first distance FDI in a first direction in a sequential feeding step. [Explanation of symbols]

[0058] 1. Punching machine 10 Elevating platform 11 Pedestal 2,2000 cookie cutters 20 bases 21, 2100 cutting blade 3 Original fabric 31 Cut Pile Fabric 32 Support part 4, 41, 42, 43, 4000, 4100 Powder sealant 5, 500, 510, 520, 5000, 5100 punched lines 5a, 500a, 510a, 520a First punching shape 5b, 500b, 510b, 520b Second punching shape 5c Third punching shape 5d Fourth punched shape 51, 501, 511, 521 First punched line 52, 502, 512, 522 Second punching line 53, 503, 513 Third punched line 504 Fourth punching line 505 Fifth punching line Area of ​​the raw material before ABP die-cutting Area of ​​the raw material after AAP die-cutting FDI 1st Distance SDI 2nd distance IST intersection EDG punched wire end Closed region defined by the punching shape of the CLD cutting blade. TSP 2-step section SLT cut Minimum width of MIW powder sealant

Claims

1. A method for punching out powder seal material from a raw material of cut pile woven fabric, cut pile knitted fabric, or felt by punching, The die used in the aforementioned punching process is equipped with only one type of cutting blade for punching shapes. The punched shape does not have a closed region that forms its boundary. Through a punching process of N+1 times (where N is a natural number) using the aforementioned die, N pieces of the powder sealing material are punched out. In the punching process where N is 2 or more, the multiple powder sealing materials are punched out adjacent to each other along a portion of their respective contours. The punching process described above is: In the preceding punching process and the subsequent punching process, no double-cut portion occurs where the same location is cut twice by the cutting blade. The contour of the powder sealing material does not have cuts caused by the punching lines of the subsequent punching process. A method for punching out powder sealant.

2. In the preceding punching process, the first punched shape is punched out of the raw material. In the subsequent punching process described above, the second punched shape is punched out of the raw material. A closed region bounded by the first punched shape and the second punched shape is punched out as the powder sealing material. The first punched shape and the second punched shape intersect at two points on the boundary of the closed region. The ends of the punching lines of the first punching shape and the punching lines of the second punching shape are both located outside the closed region. A method for punching out powder sealing material according to claim 1.

3. The punched shape is at least, The first punching line and, A second punching wire connected in a T-shape or L-shape to one side of the first punching wire, A third punching wire is connected to the other side of the first punching wire in a T-shape or L-shape, A method for punching out a powder sealant according to claim 2, including the following:

4. The punching process described above includes at least, A first punching step in which the aforementioned raw material is punched out in the aforementioned punched shape, A first progressive feeding step, which moves the raw material after the first punching step a first distance in a first direction, A second punching step is performed in which the raw material after the first progressive feeding step is punched out in the punched shape, A second progressive feeding step, which moves the raw material after the second punching step a first distance in the first direction, A third punching step is performed in which the raw material after the second progressive feeding step is punched out in the punched shape, including, A method for punching out powder sealing material according to claim 3.

5. The first powder sealing material is punched out in the first punching step and the second punching step. The second powder sealing material is punched out in the second punching step and the third punching step. The first powder sealing material and the second powder sealing material are adjacent to each other via a portion of the first punching line of the second punching process. A method for punching out powder sealing material according to claim 4.

6. The contour shape of the first powder sealing material includes the first punching line of the first punching process, the third punching line of the first punching process, the first punching line of the second punching process, and the second punching line of the second punching process. The contour shape of the second powder sealing material includes the first punching line of the second punching process, the third punching line of the second punching process, the first punching line of the third punching process, and the second punching line of the third punching process. A method for punching out powder sealing material according to claim 5.

7. The first punched lines are parallel to each other, The ends of the first punched line, the second punched line, and the third punched line are all located outside the closed region. A method for punching out powder sealing material according to claim 6.

8. The aforementioned die is equipped with multiple cutting blades, Each of the multiple cutting blades is positioned in the die in a location that does not overlap in the first direction. A method for punching out powder sealing material according to claim 7.

9. The method for punching out a powder sealant according to claim 8, wherein each of the plurality of cutting blades is arranged in the die at a second distance apart in a second direction perpendicular to the first direction.

10. The method for punching out a powder sealant according to claim 9, wherein each of the plurality of cutting blades is arranged in the die at positions that overlap in the second direction.

11. The method for punching out a powder seal material according to claim 10, wherein the powder seal material is a powder seal material used to prevent toner leakage in an electrophotographic image processing device.

12. The die used in the method for punching out powder sealing material according to any one of claims 1 to 11.

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