Perforation slit forming machine

Abstract

To provide a perforation slit forming machine that can form a perforation slit which does not completely segment a plurality of molded products.SOLUTION: A perforation slit forming machine 40 comprises: an upper rotary blade part 41 having an upper rotary shaft 43 and an upper rotary blade 44 attached to the same; a lower rotary blade part 42 having a lower rotary shaft 46 and a lower rotary blade 47 attached to the same; a servo motor 45 (48); and an operation control part 200. At least one recess 44D (47D) is provided in at least one of the upper rotary blade 44 and the lower rotary blade 47. The servo motor 45 (48) is connected to the upper rotary shaft 43 and the lower rotary shaft 46 in which the recess 44D (47D) is provided. The machine forms a perforation slit 90 in a metallic belt-like body 81 by causing the metallic belt-like body 81 to pass in a plate thickness direction while pinching the body by upper rotary blade 44 and the lower rotary blade 47.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a perforation slit forming machine. [Background technology]

[0002] There is known a slitting device for forming slits to divide a continuous body formed with a plurality of products etc. arranged horizontally into individual products etc. Examples of such a slitting device include configurations disclosed in Patent Document 1 (JP Patent Publication 5-77195A) and Patent Document 2 (JP Patent Publication 6811579A). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 5-77195 A (paragraphs 0002-0004, Figure 4, etc.) [Patent Document 2] Patent No. 6811579 (paragraphs 0083-0088, Figures 2, 3, 7, 8, etc.) Summary of the Invention [Problem to be solved by the invention]

[0004] The slit forming machines disclosed in Patent Documents 1 and 2 both form continuous slits in the length and width directions of the molded product, and therefore after passing through the slit forming machine, the molded product that has been individualized in the width direction, etc., needs to be handled, which poses the problem of making the manufacturing equipment for the molded product complex. [Means for solving the problem]

[0005] The present invention is intended to solve the above problems, and has the following object: To provide a perforation slit forming machine capable of forming perforation slits without completely dividing multiple molded products.

[0006] As a result of intensive research by the inventors to solve the above problems, the inventors have come up with the following configuration: That is, the present invention is a perforation slit forming machine arranged on a conveyance path of a metal strip in order to form perforation slits in the metal strip, which are formed into a predetermined shape by a press forming section, so as to facilitate dividing the metal strip into product widths, the perforation slit forming machine comprising an upper rotary blade unit having an upper rotary shaft extending in the width direction of the metal strip on the upper surface side of the metal strip and an upper rotary blade attached to the upper rotary shaft and rotating together with the upper rotary shaft, a lower rotary blade unit having a lower rotary shaft extending in the width direction of the metal strip on the lower surface side of the metal strip and a lower rotary blade attached to the lower rotary shaft and rotating together with the lower rotary shaft, and a positioning control unit connected to at least one of the upper rotary shaft and the lower rotary shaft. This perforation slit forming machine is equipped with a motor and an operation control unit that controls the operation of the positioning control motor, and at least one of the upper rotary blade and the lower rotary blade has at least one recess that is recessed radially inward within a required circumferential length range at the outer circumferential edge, and the positioning control motor is connected to the upper rotating shaft to which the upper rotary blade having the recess is attached, and to the lower rotating shaft to which the lower rotary blade having the recess is attached, and is characterized in that the perforation slit forming machine forms the perforation slit in the metal strip by passing the metal strip between the upper rotary blade and the lower rotary blade while sandwiching the metal strip in the plate thickness direction between the upper rotary blade and the lower rotary blade.

[0007] This makes it possible to easily divide the metal strip formed into a predetermined shape by the press molding section to the product width, and to form perforation slits that do not completely separate multiple molded products.

[0008] Furthermore, it is preferable that the upper rotating shaft and the lower rotating shaft are arranged between a buffer section for the metal strip arranged on the discharge side of the press forming section and a cut-off machine for cutting the metal strip to a predetermined product length, and that the operation control section controls the operation of the conveying device and the positioning control motor so that the discharge length of the metal strip by the metal strip conveying device in the cut-off machine matches at least one of the rotational circumference of the upper rotary blade by the positioning control motor and the rotational circumference of the lower rotary blade by the positioning control motor.

[0009] This allows a metal strip of the length to be cut by the cutoff machine to be supplied to the cutoff machine in a state synchronized with the cutoff operation of the cutoff machine.

[0010] Furthermore, it is preferable that the recess is arranged as an upper recess in the upper rotary blade and the recess is arranged as a lower recess in the lower rotary blade, and the operation control unit controls the operation of each of the positioning control motors connected to the upper rotary shaft and the lower rotary shaft so that the upper recess and the lower recess sandwich the metal strip in the thickness direction in the order of their formation along the circumferential direction, in accordance with the angular spacing of the upper recess in the circumferential direction relative to the center point of the upper rotary blade and the angular spacing of the lower recess in the circumferential direction relative to the center point of the lower rotary blade.

[0011] This increases the degree of freedom in the layout of the upper recess relative to the upper rotary blade and the layout of the lower recess relative to the lower rotary blade.

[0012] It is also preferable that a driving force transmission mechanism is attached to each of the upper rotating shaft and the lower rotating shaft, the positioning control motor is connected to either the upper rotating shaft or the lower rotating shaft, and the lower rotating shaft or the upper rotating shaft is driven by the upper rotating shaft or the lower rotating shaft via the driving force transmission mechanism.

[0013] This increases the efficiency of forming the perforation slits and reduces the frequency of replacement due to wear of the upper and lower rotary blades.

[0014] It is also preferable that the upper and lower rotary blades are positioned such that the upper and lower recesses face each other and sandwich the metal strip.

[0015] This allows the perforation slits to be formed reliably even in thick metal strips. In addition, by arranging the upper and lower recesses opposite each other, the effect of changes in the meshing depth of the upper and lower rotary blades can be reduced, allowing the formation of stable perforation slits.

[0016] It is also preferable that the upper recess and the lower recess are out of phase with each other by a required length in the circumferential direction, and that a part of the opening of the upper recess and a part of the opening of the lower recess face each other.

[0017] This makes it possible to change the length of the connecting portion of the perforation slit without changing the length dimension of the opening.

[0018] In addition, it is preferable that the upper rotating shaft and the lower rotating shaft are arranged between a buffer section for the metal strip arranged on the output side of the press molding section and a cut-off machine for cutting the metal strip to a predetermined product length, and that the operation control section operates the positioning control motor and performs a process of returning the position of the recess relative to the metal strip to its initial position while the output of the metal strip by the conveying device of the cut-off machine is stopped, which occurs in accordance with the timing at which the metal strip is cut to the product length by the cut-off machine.

[0019] This allows the perforation positions to be returned to their initial positions after each cut-off process without stopping the press molding section, so that the perforation positions can always be aligned. Effect of the Invention

[0020] According to the configuration of the present invention, a metal strip formed into a predetermined shape by a press die operated by a press molding section can be easily divided to the product width, and perforation slits can be formed so that multiple molded products are not completely separated. [Brief description of the drawings]

[0021] [Figure 1] 1 is a schematic diagram of a heat exchanger fin manufacturing apparatus having a perforation slit forming machine according to the present invention. FIG. [Diagram 2] FIG. 4 is a plan view of a heat exchange fin. [Diagram 3] FIG. 2 is a plan view showing a partial area of ​​a metal strip. [Figure 4] FIG. 2 is a plan view showing a portion of a perforated metal strip. [Diagram 5] 2 is a plan view of a portion of a width direction of a product-length metal strip. FIG. [Figure 6] FIG. 2 is a perspective view of the perforation slit forming machine of the present embodiment as viewed from the press molding section side. [Figure 7] FIG. 2 is a perspective view of the perforation slit forming machine of the present embodiment as viewed from the cut-off machine side. [Figure 8] FIG. 2 is a schematic configuration diagram of a perforation slit forming machine in the present embodiment. [Figure 9] FIG. 2 is a side view of an upper rotary blade and a lower rotary blade in the embodiment. [Figure 10] 10 is an explanatory diagram showing a state in which the phases of the grooves of the upper rotary blade and the lower rotary blade are shifted. FIG. [Figure 11] FIG. 4 is a side view of an upper rotary blade and a lower rotary blade in the first modified embodiment. [Figure 12] FIG. 2 is a schematic configuration diagram of a perforation slit forming machine in a first modified embodiment. [Figure 13] FIG. 11 is a side view of an upper rotary blade and a lower rotary blade in a second modified embodiment. [Figure 14] FIG. 13 is a side view of an upper rotary blade and a lower rotary blade in a third modified embodiment. [Figure 15] FIG. 13 is a side view of an upper rotary blade and a lower rotary blade in a fourth modified embodiment. [Figure 16] FIG. 13 is a side view of an upper rotary blade and a lower rotary blade in the fifth modified embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] In this embodiment, a heat exchanger fin manufacturing apparatus 100 to which the present invention is applied will be described. As shown in FIG. 1, the heat exchanger fin manufacturing apparatus 100 in this embodiment includes an uncoiler 10, a press forming section 20, a buffer section 30, a perforation slit forming machine 40, a cutoff machine 50, a suction section 60, a stack section 70, and an operation control section 200. The operation control section 200 controls the operations of the uncoiler 10, the press forming section 20, the perforation slit forming machine 40, the cutoff machine 50, and the suction section 60, and can adopt a known configuration having an operation control program stored in a storage section (not shown) and a calculation section represented by a CPU that operates based on the operation control program.

[0023] The uncoiler 10 unwinds the aluminum sheet 80, which is the material of the heat exchange fins 88, from the coil 11 wound around a bobbin (not shown), and may have a known configuration. The press forming section 20 has an oil supply section 21, a press die 22, a press mechanism 23, and a hitch feed mechanism 24. The aluminum sheet 80, to which processing oil is applied by the oil supply section 21, is processed into a metal strip 81 of a predetermined shape by the press die 22, which is brought into contact with and separated from the press mechanism 23. The metal strip 81 is intermittently fed from the press forming section 20 by the hitch feed mechanism 24 in synchronization with the operation of the press mechanism 23. The buffer section 30 in this embodiment is a space for keeping the metal strip 81 fed from the press forming section 20 in a sagging state downward, and buffers the difference between the forming length and the cutting length per one operation by the press forming section 20 and the cutoff machine 50 described later. The buffer portion 30 may be formed of a guide means for forming the metal strip 81 into a predetermined sagging shape.

[0024] The perforation slit forming machine 40 forms perforation slits 90 for easily dividing the metal strip 81, which is formed into a long body having a plurality of rows of heat exchange fins 88 in the width direction (the direction perpendicular to the same plane as the feeding direction) as the final product shown in FIG. 2, into product widths. FIG. 3 is a plan view showing a part of the metal strip 81 in the longitudinal direction. At least one perforation slit 90 is formed in the metal strip 81 in the product width direction, and cutting lines 91, which are cutting parts, and connecting parts 92, which are non-cut parts, are formed at required intervals in the product length direction. The perforated metal strip 82 (see FIG. 4) in which the perforation slits 90 are formed by the perforation slit forming machine 40 is intermittently fed by the product length by the conveying device 51 arranged in the cutoff machine 50, and is suction-held by the suction surface 61 of the suction unit 60 arranged downstream of the cutoff machine 50. At this time, the length of the perforated metal strip 82 protruding from the cutoff blade 52 of the cutoff machine 50 is equal to the product length.

[0025] In this way, the perforated metal strip 82 is cut to the product length by the cut-off blade 52 with the product length portion at the tip side being sucked onto the suction surface 61. As shown in FIG. 5, the product length metal strip 83 cut to the product length by the cut-off machine 50 has a plurality of heat exchange fins 88 connected in the product width direction by the connection parts 92. A stacking unit 70 having a stacking table 72 on which a stacking pin 71 is erected in alignment with the position of a through hole 89 for intubation formed in the product length metal strip 83 in a state in which it is sucked and held on the suction surface 61 is disposed below the suction surface 61 in the suction unit 60. When the operation control unit 200 temporarily stops the suction device (not shown) of the suction unit 60, the product length metal strip 83 falls from the suction surface 61 and is stacked on the stacking table 72 in the plate thickness direction with the stacking pin 71 inserted into the through hole 89. When a preset number of product length metal strips 83 are stacked in the stacking unit 70, the stacking unit 70 is transported to the next process by an operator or the like. Also, the blank stacking unit 70 is aligned and arranged in the suction unit 60, and the above operations are repeated.

[0026] Next, the perforation slit forming machine 40 according to the present invention will be described in detail. As shown in Fig. 1 and Figs. 6 to 8, the perforation slit forming machine 40 in this embodiment is disposed on the conveying path of the metal strip 81 along the width direction of the metal strip 81. The perforation slit forming machine 40 has an upper rotary blade section 41 disposed on the upper side of the metal strip 81 and a lower rotary blade section 42 disposed on the lower side of the metal strip 81. The boundary portion between the upper rotary blade section 41 and the lower rotary blade section 42 is aligned at the height position of the conveying path of the metal strip 81. The operation of the upper rotary blade section 41 and the lower rotary blade section 42 is controlled by an operation control section 200.

[0027] The upper rotary blade section 41 has an upper rotary shaft 43 extending in the width direction of the metal strip 81, upper rotary blades 44 arranged at a predetermined interval in the length direction of the upper rotary shaft 43, and an upper servo motor 45 which is a positioning control motor for rotating the upper rotary shaft 43. Here, a servo motor is used as the positioning control motor, but the positioning control motor is not limited to a servo motor, and a stepping motor can also be used. In the upper rotary blade 44 in this embodiment, an upper disc blade 44B formed with a diameter dimension larger than the outer diameter dimension of the upper holder 44A is fixed to a short cylindrical upper holder 44A. A first through hole 44C is drilled in the radial center of the upper disc blade 44B. As shown in FIG. 9, a plurality of upper recesses 44D recessed radially inward along the circumferential direction are formed in the upper disc blade 44B at the outer circumferential edge position. The number of upper recesses 44D is set to be the same as the intervals at which the connecting parts 92 are arranged in the perforation slit 90.

[0028] In addition, the length dimension W1 of the opening of the upper recess 44D (corresponding to the circumferential required length range at the outer circumferential edge of the upper disc blade 44B) is set according to the shape of the perforation slit 90 (the length of the connection part 92) to correspond to the length dimension of the connection part 92 of the perforation slit 90. The upper rotary blade 44 is held in a continuous state along the length direction of the upper rotary shaft 43 by inserting the upper rotary shaft 43 into the first through hole 44C, and is fixed to the upper rotary shaft 43 by the upper fixing part 44E at both ends in the continuous direction of the multiple upper rotary blades 44. At this time, each upper rotary blade 44 is fixed in a state where the arrangement positions in the circumferential direction of each upper recess 44D are all aligned in the length direction of the upper rotary shaft 43.

[0029] The lower rotary blade section 42 has a lower rotary shaft 46 extending in the width direction of the metal strip 81, lower rotary blades 47 arranged at a predetermined interval in the length direction of the lower rotary shaft 46, and a lower servo motor 48 which is a positioning control motor for rotating the lower rotary shaft 46. In the present embodiment, the lower rotary blade 47 is fixed to a short cylindrical lower holder 47A and a lower disc blade 47B formed with a larger diameter dimension than the outer diameter dimension of the lower holder 47A. A second through hole 47C is drilled in the radial center of the lower disc blade 47B. As shown in FIG. 9, the lower disc blade 47B has a plurality of lower recesses 47D recessed radially inward along the circumferential direction at the outer periphery position. The number of the lower recesses 47D is set to be the same as the intervals at which the connecting portions 92 are arranged in the perforation slit 90. That is, the lower recesses 47D are arranged at the same circumferential intervals as the upper recesses 44D.

[0030] The length dimension W1 of the opening of the lower recess 47D (corresponding to the required circumferential length range at the outer circumferential edge of the lower disc blade 47B) is set to match the shape of the perforation slit 90 to correspond to the length dimension of the connecting portion 92 of the perforation slit 90. The lower rotary blade 47 is held in a continuous state along the length direction of the lower rotary shaft 46 by inserting the lower rotary shaft 46 into the second through hole 47C, and is fixed to the lower rotary shaft 46 by the lower fixing portion 47E at both ends in the continuous direction of the lower rotary blades 47. At this time, the lower rotary blades 47 are fixed in a state where the circumferential arrangement positions of the lower recesses 47D are all aligned in the length direction of the lower rotary shaft 46.

[0031] As shown in Fig. 9, the upper rotary blade portion 41 and the lower rotary blade portion 42 are formed to be vertically symmetrical with respect to the line of symmetry of the metal strip 81. The upper rotary blade portion 41 and the lower rotary blade portion 42 are arranged such that the phases of the upper recessed portion 44D of the upper rotary blade 44 and the lower recessed portion 47D of the lower rotary blade 47 match. As a result, when the upper rotary blade portion 41 and the lower rotary blade portion 42 rotate with the same rotational circumferential length, the upper recessed portion 44D and the lower recessed portion 47D face each other at the same position in the longitudinal direction of the metal strip 81, so that connecting portions 92 made of uncut portions are formed at preset intervals in the longitudinal direction of the metal strip 81.

[0032] In the perforation slit forming machine 40 in this embodiment, an oil supply line 49 is arranged in parallel to the upper rotary blade section 41 at the upper part of the upper rotary blade section 41 (see FIG. 7). An oil supply nozzle 49A is arranged in the oil supply line 49 in a state aligned with the planar position of each upper disc blade 44B. The supply side end of the oil supply line 49 is connected to a processing oil tank (not shown), and processing oil stored in the processing oil tank is supplied to the oil supply line 49 by an oil supply pump (not shown). The processing oil supplied from the oil supply nozzle 49A is collected in a collection tank (neither is shown) through a discharge path. The operation of the oil supply pump is controlled by the operation control unit 200, and the amount of oil supplied from the oil supply nozzle 49A is adjusted.

[0033] Next, the processing performed by the perforation slit forming machine 40 on the metal strip 81 will be described in more detail. The metal strip 81 formed into a predetermined shape by the press forming unit 20 is sent to the perforation slit forming machine 40 via the hitch feed mechanism 24 of the press forming unit 20 and the conveying device 51 of the cut-off machine 50 via the buffer unit 30 (a space in which the metal strip 81 is sagged in a downward convex shape). Note that although the amount of metal strip 81 sent out by the hitch feed mechanism 24 and the conveying length of the perforated metal strip 82 conveyed by the conveying device 51 are different, the difference between the amount of metal strip 81 sent out by the hitch feed mechanism 24 and the conveying length by the conveying device 51 can be absorbed by changing the sagging shape of the metal strip 81 in the buffer unit 30.

[0034] The metal strip 81 supplied to the perforation slit forming machine 40 in the above manner is fed out while being sandwiched in the thickness direction by the upper rotary blade section 41 and the lower rotary blade section 42, and a perforation slit 90 is formed by the upper rotary blade 44 and the lower rotary blade 47. Processing oil is supplied from an oil supply nozzle 49A from a position above the upper rotary blade 44, reducing stress on the metal strip 81 during processing and preventing wear on the upper rotary blade 44 and the lower rotary blade 47. The upper rotary blade section 41 and the lower rotary blade section 42 in this embodiment are rotated independently of each other by the upper servo motor 45 and the lower servo motor 48.

[0035] In this embodiment, the operation control unit 200 controls the operation of each so that the feed length of the perforated metal strip 82 by the conveying device 51 of the cutoff machine 50 matches the rotational circumference of the upper rotary blade 44 by the upper servo motor 45 and the rotational circumference of the lower rotary blade 47 by the lower servo motor 48. By adopting such a configuration, stress generated during the conveyance of the metal strip 81 and the perforated metal strip 82 is reduced, and it is therefore possible to provide a heat exchange fin 88 with high dimensional accuracy.

[0036] In this way, the metal strip 81 is formed into a perforated metal strip 82 in which at least one perforation slit 90 is formed across the width of the metal strip 81 by the perforation slit forming machine 40, and is then sent to the cut-off machine 50.

[0037] In this embodiment, the upper rotary blade section 41 and the lower rotary blade section 42 are in a state in which the phases of the upper recess 44D of the upper rotary blade 44 and the lower recess 47D of the lower rotary blade 47 are completely matched (the ends of the openings of each blade are matched), but the present invention is not limited to this form. As shown in FIG. 10, a form in which the phases are shifted in the circumferential direction within the length range of the openings in the circumferential direction of the upper recess 44D and the lower recess 47D can also be adopted. As a result, the circumferential length of the overlapping portion in the circumferential direction of the upper recess 44D and the lower recess 47D becomes W2, and a connecting portion 92 is formed that is shorter than the length W1 of the connecting portion 92 formed when the upper recess 44D and the lower recess 47D rotate in the same phase. According to this form, it is possible to adjust the length of the connecting portion 92 in the perforation slit 90 without changing the circumferential length dimension W1 of the upper recess 44D and the lower recess 47D.

[0038] Meanwhile, while the cut-off machine 50 is cutting the perforated metal strip 82, at least the conveying device 51 of the cut-off machine 50 stops conveying the metal strip 81. During this time, the metal strip 81 sent out from the press forming section 20 is bent in the buffer section 30, so that the supply of the metal strip 81 to the perforation slit forming machine 40 is temporarily stopped. The operation control section 200 can also execute a process of driving the upper servo motor 45 and the lower servo motor 48 at least while the conveying device 51 of the cut-off machine 50 stops conveying the metal strip 81 (while the conveying device 51 of the cut-off machine 50 stops taking in the metal strip 81 in accordance with the timing at which the perforated metal strip 82 is cut to the product length). This returns the position of the upper recess 44D and the opposing state of the lower recess 47D to their initial positions, allowing the positions of the cutting lines 91 and connecting portions 92 of the perforated slits 90 formed in the perforated metal strip 82 and the product length metal strip 83 to always be aligned in the product length direction.

[0039] As described above, according to the configuration of the perforation slit forming machine 40 in this embodiment, uniform perforation slits 90 can be formed along the product length direction of the metal strip 81. In addition, by changing the number of upper recesses 44D of the upper rotary blade 44 and the number of lower recesses 47D of the lower rotary blade 47, the number of connecting portions 92 arranged per unit length of the perforation slit 90 can be easily changed. Furthermore, by changing the overlap length in the circumferential direction of the upper recesses 44D and the lower recesses 47D, the length of the connecting portion 92 can be changed. And, since the upper recesses 44D and the lower recesses 47D are reset to the initial setting state every time the perforated metal strip 82 is cut to the product length, the positions of the cutting line 91 and the connecting portion 92 in each perforation slit 90 formed in the product length metal strip 83 can be always aligned.

[0040] In the above embodiment, the oil supply line 49 and the oil supply nozzle 49A are disposed in parallel to the upper rotary blade portion 41 at the upper portion of the upper rotary blade portion 41, but the positions of the oil supply line 49 and the oil supply nozzle 49A are not limited to the positions shown in this embodiment, and they can be disposed in peripheral positions including the contact portions of the metal strip 81 with the upper rotary blade portion 41 and the lower rotary blade portion 42. Also, a form in which the oil supply line 49 and the oil supply nozzle 49A are omitted may be selected.

[0041] In the above embodiment, the upper disc blade 44B of the upper rotary blade 44 is provided with the upper recess 44D, and the lower disc blade 47B of the lower rotary blade 47 is provided with the lower recess 47D, but the present invention is not limited to this embodiment. As shown in FIG. 11, the upper disc blade 44B of the upper rotary blade 44 is provided with the upper recess 44D, but the lower disc blade 47B of the lower rotary blade 47 is not provided with the lower recess 47D, so that a first modified embodiment can be adopted, in which a simple disc blade is applied. In the following, only the characteristic configurations of each modified embodiment will be described, but other configurations that are not described are the same as those of the above-described embodiment.

[0042] In the perforation slit forming machine 40 in the first modified embodiment, an upper servo motor 45 is disposed only on the upper rotary blade unit 41 as a positioning control motor. The lower rotary blade unit 42, in which a simple circular blade is applied to the lower disc blade 47B, can adopt a configuration that follows the rotation of the upper rotary shaft 43 of the upper rotary blade unit 41. Specifically, as shown in FIG. 12, an upper gear G1 and a lower gear G2 are attached to the upper rotary shaft 43 and the lower rotary shaft 46 as a driving force transmission mechanism, and the upper gear G1 is meshed with the lower gear G2. Note that, in the perforation slit forming machine 40 shown in FIG. 12, the upper gear G1 and the lower gear G2 are directly meshed with each other, but the upper gear G1 and the lower gear G2 can be indirectly meshed with each other via a belt, a chain, or the like.

[0043] In the first modified embodiment, the lower rotary blade portion 42 is driven by the upper rotary blade portion 41, which is the drive shaft, by meshing the upper gear G1 and the lower gear G2 as a driving force transmission mechanism, but the present invention is not limited to this embodiment. It is also possible to adopt a configuration in which the lower rotary blade portion 42 rotates by friction with the metal strip 81 relative to the upper rotary blade portion 41, which is the drive shaft.

[0044] Also, as shown in Fig. 13, a second modified embodiment can be adopted in which the diameter dimension R1 of the upper rotary blade 44 and the diameter dimension R2 of the lower rotary blade 47 are different, and the upper recessed portion 44D formed in the upper disc blade 44B of the upper rotary blade 44 has an arrangement angle interval α degrees with respect to the center point O1 of the upper rotary blade 44, and the lower recessed portion 47D formed in the lower disc blade 47B of the lower rotary blade 47 has an arrangement angle interval β degrees with respect to the center point O2 of the lower rotary blade 47. Here, only the characteristic configuration of the second modified embodiment will be described, but other configurations that will not be described are the same as those of the above-described embodiment. The operation control unit 200 in the second modified embodiment controls the operation of the upper servo motor 45 and the lower servo motor 48 so that the rotation angle of the upper rotary shaft 43 of the upper rotary blade unit 41 and the rotation angle of the lower rotary shaft 46 of the lower rotary blade unit 42 are α degrees.

[0045] In the second modified embodiment, the diameter dimension R1 of the upper rotary blade 44 and the diameter dimension R2 of the lower rotary blade 47 are different from the beginning, but the present invention is not limited to this embodiment. The second modified embodiment is also preferably applied when the upper disc blade 44B of the upper rotary blade 44 and the lower disc blade 47B of the lower rotary blade 47 wear differently due to use or grinding.

[0046] Also, as shown in FIG. 14, a third modified embodiment may be adopted in which the diameter dimension R1 of the upper rotary blade 44 and the diameter dimension R2 of the lower rotary blade 47 are equal, and the upper recess 44D formed in the upper disc blade 44B of the upper rotary blade 44 has an angle interval α degrees with respect to the center point O1 of the upper rotary blade 44, and the lower recess 47D formed in the lower disc blade 47B of the lower rotary blade 47 has an angle interval β degrees with respect to the center point O2 of the lower rotary blade 47. Here, only the characteristic configuration of the third modified embodiment will be described, but other configurations that will not be described are the same as those of the above-described embodiment. The operation control unit 200 in the third modified embodiment controls the operation of the upper servo motor 45 and the lower servo motor 48 so that the ratio of the rotation angle of the upper rotary shaft 43 of the upper rotary blade unit 41 to the rotation angle of the lower rotary shaft 46 of the lower rotary blade unit 42 becomes β:α.

[0047] Also, as shown in Fig. 15, a fourth modified embodiment may be adopted in which the diameter dimension R1 of the upper rotary blade 44 and the diameter dimension R2 of the lower rotary blade 47 are different, and the upper recess 44D formed in the upper disc blade 44B of the upper rotary blade 44 has an arrangement angle interval α degrees with respect to the center point O1 of the upper rotary blade 44, and the lower recess 47D formed in the lower disc blade 47B of the lower rotary blade 47 has an arrangement angle interval β degrees with respect to the center point O2 of the lower rotary blade 47. Here, only the characteristic configuration of the fourth modified embodiment will be described, but other configurations that are not described are the same as those of the above-described embodiment. The operation control unit 200 in the fourth modified embodiment controls the operation of the upper servo motor 45 and the lower servo motor 48 so that the ratio between the rotation angle of the upper rotary shaft 43 of the upper rotary blade unit 41 and the rotation angle of the lower rotary shaft 46 of the lower rotary blade unit 42 becomes β:α.

[0048] 16, a fifth modified embodiment may be adopted in which the diameter dimension R1 of the upper rotary blade 44 and the diameter dimension R2 of the lower rotary blade 47 are different, and the arrangement angle interval α degrees of the upper recess 44D formed in the upper disc blade 44B of the upper rotary blade 44 with respect to the center point O1 of the upper rotary blade 44 is different from the arrangement angle interval β degrees of the lower recess 47D formed in the lower disc blade 47B of the lower rotary blade 47 with respect to the center point O2 of the lower rotary blade 47, but the arrangement circumferential interval L1 of the upper recess 44D formed in the upper rotary blade 44 and the arrangement circumferential interval L2 of the lower recess 47D formed in the lower rotary blade 47 are equal. Here, only the characteristic configuration of the fifth modified embodiment will be described, but other configurations that will not be described are the same as those of the above-described embodiment. The operation control section 200 in the fifth modified embodiment controls the operations of the upper servo motor 45 and the lower servo motor 48 so that the rotational peripheral length of the upper rotary blade 44 and the rotational peripheral length of the lower rotary blade 47 are equal to each other.

[0049] Specifically, an example of a method can be given in which the operation control unit 200 controls the operation of the upper servo motor 45 and the lower servo motor 48 so that the rotational circumferential length of the upper rotary blade 44 (here, the length of the arrangement circumferential interval L1) and the rotational circumferential length of the lower rotary blade 47 (here, the length of the arrangement circumferential interval L2) per unit time are equal, based on the radial dimension R1 of the upper rotary blade 44 and the arrangement angle interval α degrees in the circumferential direction of the upper recess 44D relative to the center point O1 of the upper rotary blade 44, and the radial dimension R2 of the lower rotary blade 47 and the arrangement angle interval β degrees in the circumferential direction of the lower recess 47D relative to the center point O2 of the lower rotary blade 47.

[0050] In addition, in the above-described embodiment and modified embodiment, a configuration may be adopted in which a disk blade diameter measuring means (not shown) is additionally provided to measure the diameter R1 of the upper disk blade 44B and the diameter R2 of the lower disk blade 47B at a preset predetermined operation time interval. In this configuration, the operation control unit 200 can control the operation of the upper servo motor 45 and the lower servo motor 48 based on the measurement value from the disk blade diameter measuring means and the arrangement angle interval α of the upper recesses 44D and the arrangement angle interval β of the lower recesses 47D that are set in advance (input in advance by the input means). Even with this configuration, the metal strip 81 can be sandwiched in the thickness direction between the upper recesses 44D and the lower recesses 47D in the order of formation of the upper recesses 44D and the lower recesses 47D along the circumferential direction of the upper rotary blade 44 (upper disk blade 44B) and the lower rotary blade 47 (lower disk blade 47B). When the operation control unit 200 controls the operation of the upper servo motor 45 and the lower servo motor 48, it can do so based on the rotation angle of the upper rotating shaft 43 and the lower rotating shaft 46 or the rotational circumference of the upper rotating blade 44 (upper disc blade 44B) and the lower rotating blade 47 (lower disc blade 47B).

[0051] Furthermore, in the above embodiment, the perforation slit forming machine 40 is illustrated as being disposed between the buffer section 30 and the cut-off machine 50 in the conveying direction of the metal strip 81 of the heat exchanger fin manufacturing apparatus 100, but is not limited to this embodiment. The perforation slit forming machine 40 may be disposed upstream of the cut-off machine 50 in the conveying direction of the metal strip 81.

[0052] In addition to the modified examples described above, it is also possible to adopt a form in which the modified examples described in the embodiment are appropriately combined. [Explanation of symbols]

[0053] 10: Uncoiler 11: Coil 20: Press molding section 21: Oil supply section, 22: Press die, 23: Press mechanism, 24: Hitch feed mechanism 30: Buffer section 40: Perforation slit forming machine 41: Upper rotary blade section, 42: Lower rotary blade section, 43: Upper rotary shaft, 44: Upper rotary blade, 44A: upper holder, 44B: upper disc blade, 44C: first through hole, 44D: upper recess, 44E: Upper fixed part, 45: Upper servo motor, 46: Lower rotating shaft, 47: Lower rotating blade, 47A: Lower holder, 47B: Lower disc blade, 47C: Second through hole, 47D: Lower recess, 47E: Lower fixed part, 48: Lower servo motor, 49: Oil supply line, 49A: Oil supply nozzle 50: Cut-off machine 51: conveyor device, 52: cut-off blade 60: Suction section 61: Adsorption surface 70: Stack section 71: Stack pin, 72: Stack table 80: Aluminum sheet 81: Metal strip, 82: Perforated metal strip, 83: Product length metal strip, 88: Heat exchange fin, 89: Through hole 90: Perforated slit 91: Cutting line, 92: Connection part 100: Heat exchanger fin manufacturing equipment 200: Motion control unit G1: Upper gear (driving force transmission mechanism), G2: Lower gear (driving force transmission mechanism)

Claims

1. A perforation slit forming machine arranged on a conveying path of a metal strip to form a perforation slit in the metal strip so as to facilitate dividing the metal strip into a product width, the perforation slit forming machine being arranged on a conveying path of the metal strip, an upper rotary blade unit including an upper rotary shaft extending in a width direction of the metal strip on the upper surface side of the metal strip and an upper rotary blade attached to the upper rotary shaft and rotating together with the upper rotary shaft; a lower rotary blade unit including a lower rotary shaft extending in a width direction of the metal strip on the lower surface side of the metal strip and a lower rotary blade attached to the lower rotary shaft and rotating together with the lower rotary shaft; a positioning control motor coupled to at least one of the upper rotating shaft and the lower rotating shaft; An operation control unit that controls the operation of the positioning control motor, At least one of the upper rotary blade and the lower rotary blade is provided with at least one recess that is recessed radially inward within a required circumferential length range on an outer circumferential edge, the positioning control motor is connected to the upper rotary shaft to which the upper rotary blade having the recess is attached and to the lower rotary shaft to which the lower rotary blade having the recess is attached, A perforation slit forming machine characterized by forming the perforation slit in the metal strip by passing the metal strip between the upper rotary blade and the lower rotary blade while clamping the metal strip in the thickness direction between the upper rotary blade and the lower rotary blade.

2. the upper rotating shaft and the lower rotating shaft are disposed between a buffer unit for the metal strip disposed on the delivery side of the press forming unit and a cut-off machine for cutting the metal strip to a preset product length, The operation control unit is The perforation slit forming machine described in claim 1, characterized in that the operation of the conveying device and the positioning control motor are each controlled so that the feed length of the metal strip by the metal strip conveying device in the cut-off machine matches at least one of the rotational circumference of the upper rotary blade by the positioning control motor and the rotational circumference of the lower rotary blade by the positioning control motor.

3. The recess is disposed on the upper rotary blade as an upper recess, and the recess is disposed on the lower rotary blade as a lower recess, The perforation slit forming machine described in claim 1, characterized in that the operation control unit controls the operation of each of the positioning control motors connected to the upper rotating shaft and the lower rotating shaft so that the upper recesses and the lower recesses sandwich the metal strip in the thickness direction in the order of their formation along the circumferential direction, in accordance with the circumferential angular spacing of the upper recesses relative to the center point of the upper rotary blade and the circumferential angular spacing of the lower recesses relative to the center point of the lower rotary blade.

4. a driving force transmission mechanism is attached to each of the upper rotating shaft and the lower rotating shaft, the positioning control motor is connected to either the upper rotating shaft or the lower rotating shaft, 3. The perforation slit forming machine according to claim 1, wherein the lower rotating shaft or the upper rotating shaft is driven by the upper rotating shaft or the lower rotating shaft via the drive force transmission mechanism.

5. The perforation slit forming machine according to claim 3, characterized in that the upper and lower rotary blades are positioned such that the upper and lower recesses face each other and sandwich the metal strip.

6. The perforation slit forming machine according to claim 3, characterized in that the upper recess and the lower recess are out of phase with each other by a required length in the circumferential direction, and a portion of the opening of the upper recess faces a portion of the opening of the lower recess.

7. the upper rotating shaft and the lower rotating shaft are disposed between a buffer unit for the metal strip disposed on the delivery side of the press forming unit and a cut-off machine for cutting the metal strip to a preset product length, The operation control unit is The perforation slit forming machine described in claim 3, characterized in that while the feeding of the metal strip by the conveying device of the cut-off machine is stopped in accordance with the timing when the metal strip is cut to the product length by the cut-off machine, the positioning control motor is operated and a process is performed to return the position of the recess relative to the metal strip to its initial position.

8. the upper rotating shaft and the lower rotating shaft are disposed between a buffer unit for the metal strip disposed on the delivery side of the press forming unit and a cut-off machine for cutting the metal strip to a preset product length, The operation control unit is The perforation slit forming machine described in claim 4, characterized in that while the feeding of the metal strip by the conveying device of the cut-off machine is stopped in accordance with the timing when the metal strip is cut to the product length by the cut-off machine, the positioning control motor is operated and a process is performed to return the position of the recess relative to the metal strip to its initial position.

9. the upper rotating shaft and the lower rotating shaft are disposed between a buffer unit for the metal strip disposed on the delivery side of the press forming unit and a cut-off machine for cutting the metal strip to a preset product length, The operation control unit is The perforation slit forming machine described in claim 5, characterized in that while the feeding of the metal strip by the conveying device of the cut-off machine is stopped in accordance with the timing when the metal strip is cut to the product length by the cut-off machine, the positioning control motor is operated and a process is performed to return the position of the recess relative to the metal strip to its initial position.

10. the upper rotating shaft and the lower rotating shaft are disposed between a buffer unit for the metal strip disposed on the delivery side of the press forming unit and a cut-off machine for cutting the metal strip to a preset product length, The operation control unit is The perforation slit forming machine described in claim 6, characterized in that while the feeding of the metal strip by the conveying device of the cut-off machine is stopped in accordance with the timing when the metal strip is cut to the product length by the cut-off machine, the positioning control motor is operated and a process is performed to return the position of the recess relative to the metal strip to its initial position.

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