Stitch 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 Art

[0002] There is known a slit device for forming a slit for dividing a continuum formed with a plurality of products or the like arranged side by side in the lateral direction into individual products. As an example of such a slit device, there is a configuration disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 5-77195) and Patent Document 2 (Japanese Patent No. 6811579).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the slit forming machines disclosed in Patent Document 1 and Patent Document 2 both form slits continuous in the length direction or width direction of the molded product, after passing through the slit forming machine, it is necessary to handle the molded products separated in the width direction or the like, and there is a problem that the manufacturing apparatus for the molded products becomes complicated.

Means for Solving the Problems

[0005] Therefore, the present invention is for solving the above problems, and its object is as follows. That is, an object of the present invention is to provide a perforation slit forming machine capable of forming perforation slits that do not completely divide a plurality of molded products.

[0006] As a result of the inventors' intensive research to solve the above problems, they came up with the following configuration. That is, the present invention is a perforation slit forming machine disposed on the conveyance path of the metal strip to form a perforation slit in the metal strip to facilitate dividing the metal strip formed into a predetermined shape by a press forming section into the product width, the perforation slit forming machine including: an upper rotating shaft extending in the width direction of the metal strip on the upper surface side of the metal strip; an upper rotating blade attached to the upper rotating shaft and rotating together with the upper rotating shaft, the upper rotating blade portion having the upper rotating blade; a lower rotating shaft extending in the width direction of the metal strip on the lower surface side of the metal strip; a lower rotating blade attached to the lower rotating shaft and rotating together with the lower rotating shaft, the lower rotating blade portion having the lower rotating blade; a positioning control motor connected to at least one of the upper rotating shaft and the lower rotating shaft; and an operation control section for controlling the operation of the positioning control motor, wherein at least one of the upper rotating blade and the lower rotating blade is provided with at least one recess recessed radially inward in a required circumferential length range in the circumferential direction at the outer peripheral edge, the positioning control motor being connected to the upper rotating shaft to which the upper rotating blade having the recess is attached and the lower rotating shaft to which the lower rotating blade having the recess is attached, and the perforation slit forming machine being characterized in that the perforation slit is formed in the metal strip by passing the metal strip between the upper rotating blade and the lower rotating blade while sandwiching the metal strip in the plate thickness direction between the upper rotating blade and the lower rotating blade.

[0007] Thereby, it becomes possible to form a perforation slit in which the metal strip formed into a predetermined shape by the press forming section can be easily divided into the product width and a plurality of molded products are not completely separated.

[0008] Further, the upper rotation shaft and the lower rotation shaft are disposed between a buffer portion of the metal strip disposed on the feeding side of the press forming portion and a cutoff machine that cuts the metal strip into a preset product length, and the operation control unit controls the feeding length of the metal strip by a conveying device of the cutoff machine in the cutoff machine, and the rotation circumference length of the upper rotation blade by the positioning control motor and the rotation circumference length of the lower rotation blade by the positioning control motor. It is preferable that the operations of the conveying device and the positioning control motor are respectively controlled so that at least one of them coincides.

[0009] Thereby, the metal strip corresponding to the length of the metal strip cut by the cutoff machine can be supplied to the cutoff machine in a state synchronized with the cutoff operation of the cutoff machine.

[0010] Further, the concave portion is disposed as an upper concave portion on the upper rotation blade, and the concave portion is disposed as a lower concave portion on the lower rotation blade, and the operation control unit is configured to control the upper rotation blade with respect to the center point of the upper rotation blade. According to the circumferential arrangement angle interval of the upper concave portion and the circumferential arrangement angle interval of the lower concave portion with respect to the center point of the lower rotation blade, the upper concave portion and the lower concave portion are arranged in the order of formation along the circumferential direction. It is preferable to control the operation of each positioning control motor connected to the upper rotation shaft and the lower rotation shaft so as to sandwich the metal strip in the plate thickness direction.

[0011] Thereby, the degree of freedom of the layout of the upper concave portion with respect to the upper rotation blade and the layout of the lower concave portion with respect to the lower rotation blade is increased.

[0012] Further, a driving force transmission mechanism is respectively attached to the upper rotation shaft and the lower rotation shaft, the positioning control motor is connected to either the upper rotation shaft or the lower rotation shaft, and the lower rotation shaft or the upper rotation shaft is connected via the driving force transmission mechanism. It is preferable that the upper rotation shaft or the lower rotation shaft is driven.

[0013] This can improve the formation efficiency of the zigzag slit and reduce the replacement frequency due to wear of the upper rotary blade and the lower rotary blade.

[0014] In addition, it is preferable that the upper rotary blade and the lower rotary blade are positioned such that the upper concave portion and the lower concave portion sandwich the metal strip in a state where the upper concave portion and the lower concave portion face each other.

[0015] This enables the formation of a zigzag slit even in a thick metal strip. Also, by opposing the upper concave portion and the lower concave portion, the influence when the meshing depth of the upper rotary blade and the lower rotary blade changes can be reduced, and a stable zigzag slit can be formed.

[0016] In addition, it is preferable that the upper concave portion and the lower concave portion are out of phase by a required length in the circumferential direction, and a part of the opening of the upper concave portion and a part of the opening of the lower concave portion face each other.

[0017] This can change the length of the connecting portion of the zigzag slit without changing the length dimension of the opening.

[0018] In addition, the upper rotary shaft and the lower rotary shaft are disposed between the buffer portion of the metal strip disposed on the feeding side of the press forming portion and a cutoff machine that cuts the metal strip into a preset product length, and the operation control unit is configured to: When the feeding of the metal strip by the conveying device of the cutoff machine stops, which occurs in accordance with the timing when the metal strip is cut into the product length by the cutoff machine, the positioning control motor is operated, and it is preferable to execute a process of returning the position of the concave portion with respect to the metal strip to the initial position.

[0019] This can return the position of the zigzag to the initial position for each cutoff process without stopping the press forming portion, so that the positions of the zigzags can always be aligned.

Advantages 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 forming section can be easily divided into a product width, and a perforation slit can be formed in which a plurality of molded products are not completely separated.

Brief Description of the Drawings

[0021]

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Mode for Carrying Out the Invention

[0022] In the present embodiment, a heat exchange fin manufacturing apparatus 100 to which the present invention is applied will be described. As shown in FIG. 1, the heat exchange fin manufacturing apparatus 100 in the present 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 an arithmetic section represented by a CPU that operates based on the operation control program.

[0023] The uncoiler 10 unwinds an aluminum sheet 80, which is a material for the heat exchange fin 88, from a coil 11 wound around a bobbin (not shown), and a known configuration can be adopted. 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 coated with processing oil by the oil supply section 21 is processed into a metal strip 81 having a predetermined shape by the press die 22 that contacts and separates by the press mechanism 23. The metal strip 81 is intermittently sent out from the press forming section 20 in synchronization with the operation of the press mechanism 23 by the hitch feed mechanism 24. The buffer section 30 in the present embodiment is a space that allows the metal strip 81 sent out from the press forming section 20 to sag downward, and buffers the difference in the forming length and the cutting length per hit by the press forming section 20 and the cutoff machine 50 to be described later. The buffer section 30 can also be configured by guiding means or the like that gives the metal strip 81 a predetermined sagging shape.

[0024] The sewing slit forming machine 40 forms sewing slits 90 for facilitating the division of a long metal strip 81, which has a plurality of rows of heat exchange fins 88 (the final product shown in FIG. 2) in the width direction (a direction orthogonal to the feeding direction in the same plane), into the product width. FIG. 3 is a plan view showing a part of the metal strip 81 in the longitudinal direction. At least one sewing slit 90 is formed in the metal strip 81 in the product width direction, and cutting lines 91, which are cut portions, and connecting portions 92, which are non-cut portions, are formed at required intervals in the product length direction. The sewn metal strip 82 (see FIG. 4) in which the sewing slit 90 is formed by the sewing slit forming machine 40 is intermittently fed by a conveying device 51 disposed in a cutoff machine 50 and is adsorbed and held on an adsorption surface 61 of a suction portion 60 disposed downstream of the cutoff machine 50. At this time, the length of the sewn metal strip 82 protruding from a cutoff blade 52 of the cutoff machine 50 is equal to the product length.

[0025] In this way, the sewn metal strip 82 is cut to the product length by the cutoff blade 52 with the product length portion on the front end side adsorbed on the adsorption surface 61. As shown in FIG. 5, the product length metal strip 83 cut to the product length by the cutoff machine 50 is in a state where a plurality of heat exchange fins 88 in the product width direction are connected by the connecting portion 92. At a position below the adsorption surface 61 in the suction portion 60, a stacking portion 70 having a stacking base 72 with a stacking pin 71 erected is disposed in alignment with the position of a through hole 89 for insertion formed in the product length metal strip 83 held adsorbed on the adsorption surface 61. When an operation control unit 200 temporarily stops a suction device (not shown) of the suction portion 60, the product length metal strip 83 drops from the adsorption surface 61 and is stacked in the plate thickness direction on the stacking base 72 with the stacking pin 71 inserted through the through hole 89. When a preset number of product length metal strips 83 are stacked in the stacking portion 70, the stacking portion 70 is conveyed to the next process by an operator or the like. Also, the blank stacking portion 70 is disposed in alignment with the suction portion 60, and the above operations are repeated.

[0026] Next, the sewing slit forming machine 40 according to the present invention will be described in detail. As shown in FIGS. 1, 6 to 8, the sewing slit forming machine 40 in the present embodiment is disposed on the conveyance path of the metal strip 81 along the width direction of the metal strip 81. The sewing slit forming machine 40 has an upper rotary blade portion 41 disposed above the metal strip 81 and a lower rotary blade portion 42 disposed below the metal strip 81. The boundary portion between the upper rotary blade portion 41 and the lower rotary blade portion 42 is aligned with the height position of the conveyance path of the metal strip 81. The operations of the upper rotary blade portion 41 and the lower rotary blade portion 42 are controlled by the operation control unit 200.

[0027] The upper rotary blade portion 41 has an upper rotary shaft 43 extending in the width direction of the metal strip 81, upper rotary blades 44 disposed at predetermined intervals 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 adopted as the positioning control motor, but the positioning control motor is not limited to the servo motor, and a stepping motor can also be adopted. The upper rotary blade 44 in the present embodiment has an upper disk blade 44B formed to have a diameter larger than the outer diameter dimension of the upper holder 44A fixed to the short cylindrical upper holder 44A. A first through hole 44C is formed in the radial center portion of the upper disk blade 44B. As shown in FIG. 9, a plurality of upper recesses 44D recessed radially inward along the circumferential direction are formed at the outer peripheral edge position of the upper disk blade 44B. The number of the upper recesses 44D is set to be the same as the arrangement interval of the connecting portions 92 in the sewing slit 90.

[0028] In addition, the length dimension W1 of the opening of the upper concave portion 44D (corresponding to the required circumferential length range on the outer peripheral edge of the upper disc blade 44B) is set according to the length dimension of the connecting portion 92 of the perforation slit 90, so it is set according to the shape (length of the connecting portion 92) of the perforation slit 90. The upper rotary blade 44 has a plurality of upper rotary blades 44 held in a continuous state along the length direction of the upper rotary shaft 43 by inserting the upper rotary shaft 43 through the first through hole 44C, and is fixed to the upper rotary shaft 43 by the upper fixing portion 44E at both ends in the continuous direction of the plurality of 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 concave portion 44D are all aligned in the length direction of the upper rotary shaft 43.

[0029] The lower rotary blade portion 42 includes a lower rotary shaft 46 extending in the width direction of the metal strip 81, a lower rotary blade 47 disposed 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. The lower rotary blade 47 in the present embodiment has a lower disc blade 47B formed with a diameter larger than the outer diameter dimension of the lower holding body 47A fixed to the short cylindrical lower holding body 47A. A second through hole 47C is formed in the radially central portion of the lower disc blade 47B. As shown in FIG. 9, the lower disc blade 47B has a plurality of lower concave portions 47D recessed radially inward along the circumferential direction at the outer peripheral edge position. The number of arrangements of the lower concave portions 47D is set to be the same interval as the arrangement interval of the connecting portion 92 in the perforation slit 90. That is, the lower concave portions 47D are arranged at the same circumferential length interval as the upper concave portions 44D.

[0030] In addition, the length dimension W1 of the opening of the lower concave portion 47D (corresponding to the required circumferential length range on the outer peripheral edge of the lower disk blade 47B) is set according to the length dimension of the connecting portion 92 of the perforation slit 90, so it is set according to the shape 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 plurality of lower rotary blades 47. At this time, each lower rotary blade 47 is fixed in a state where the circumferential arrangement positions of the respective lower concave portions 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 symmetric with respect to the symmetry line of the metal strip 81. The upper rotary blade portion 41 and the lower rotary blade portion 42 have the same phase for the upper concave portion 44D of the upper rotary blade 44 and the lower concave portion 47D of the lower rotary blade 47. Thereby, when the upper rotary blade portion 41 and the lower rotary blade portion 42 rotate with the same rotation circumference length, the upper concave portion 44D and the lower concave portion 47D face each other at the same position in the length direction of the metal strip 81, and in the length direction of the metal strip 81, the connecting portion 92 by the non-cut portion is formed at a preset interval.

[0032] In the perforation slit forming machine 40 according to the present embodiment, an oil supply line 49 parallel to the upper rotary blade portion 41 is disposed on the upper portion of the upper rotary blade portion 41 (see FIG. 7). Oil supply nozzles 49A are disposed on the oil supply line 49 in a state of being aligned with the plane positions of the respective upper disk blades 44B. The supply side end of the oil supply line 49 is connected to a machining oil tank (not shown), and the machining oil stored in the machining oil tank is supplied to the oil supply line 49 by an oil supply pump (not shown). The machining oil supplied from the oil supply nozzle 49A is recovered to a recovery tank (both not 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 buffer unit 30 (a space for sagging the metal strip 81 in a downwardly convex shape) by the index feeding mechanism 24 of the press forming unit 20 and the conveying device 51 of the cutoff machine 50. Although the feeding amount of the metal strip 81 by the index feeding mechanism 24 and the conveying length of the perforated metal strip 82 by the conveying device 51 are different, the difference between the feeding amount by the index feeding mechanism 24 and the conveying length by the conveying device 51 can be absorbed by the change in 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 as described above is sent out while being sandwiched in the plate thickness direction by the upper rotary blade part 41 and the lower rotary blade part 42, and thus, the perforation slit 90 is formed by the upper rotary blade 44 and the lower rotary blade 47. Since the processing oil is supplied from above the upper rotary blade 44 by the oil supply nozzle 49A, the stress applied to the metal strip 81 during processing is reduced, and the wear of the upper rotary blade 44 and the lower rotary blade 47 is prevented. The upper rotary blade part 41 and the lower rotary blade part 42 of the present embodiment are rotationally driven independently of each other by the upper servo motor 45 and the lower servo motor 48.

[0035] In the present embodiment, the operation control unit 200 controls the respective operations so that the feeding length of the perforated metal strip 82 by the conveying device 51 of the cutoff machine 50, the circumferential length of the rotation of the upper rotary blade 44 by the upper servo motor 45, and the circumferential length of the rotation of the lower rotary blade 47 by the lower servo motor 48 respectively coincide. By adopting such a form, the stress generated during the conveyance of the metal strip 81 and the perforated metal strip 82 is reduced, and as a result, the heat exchange fins 88 with high dimensional accuracy can be provided.

[0036] In this way, the metal strip 81 is formed into a perforated metal strip 82 having at least one perforation slit 90 formed in the width direction of the metal strip 81 by the perforation slit forming machine 40 and is sent out to the cutoff machine 50.

[0037] In the present embodiment, the upper rotary blade portion 41 and the lower rotary blade portion 42 are in a state where the phases of the upper concave portion 44D of the upper rotary blade 44 and the lower concave portion 47D of the lower rotary blade 47 are completely matched (the ends of the openings of each other 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 concave portion 44D and the lower concave portion 47D can also be adopted. Thereby, the circumferential length of the overlapping portion in the circumferential direction of the upper concave portion 44D and the lower concave portion 47D becomes W2, and a connecting portion 92 shorter than the length W1 of the connecting portion 92 formed when the upper concave portion 44D and the lower concave portion 47D rotate in the same phase is formed. 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 concave portion 44D and the lower concave portion 47D.

[0038] Incidentally, while the cut-off machine 50 is performing the cutting process on the perforated metal strip 82, at least the conveyance of the metal strip 81 in the conveyance device 51 of the cut-off machine 50 stops. During this period, the metal strip 81 sent out from the press forming unit 20 is deflected by the buffer unit 30, temporarily stopping the supply of the metal strip 81 to the perforation slit forming machine 40. The operation control unit 200 can execute a process of driving the upper servo motor 45 and the lower servo motor 48 at least while the conveyance of the metal strip 81 in the conveyance device 51 of the cut-off machine 50 stops (while the intake of the metal strip 81 by the conveyance device 51 of the cut-off machine 50 stops in accordance with the timing when the perforated metal strip 82 is cut to the product length). As a result, the position of the upper recess 44D and the opposing state of the lower recess 47D are returned to the initial position state, and the positions of the cutting line 91 and the connecting portion 92 of the perforation slit 90 formed in the perforated metal strip 82 and the product-length metal strip 83 can always be aligned in the product length direction.

[0039] As described above, according to the configuration of the perforation slit forming machine 40 in the present embodiment, uniform perforation slits 90 can be formed along the product length direction of the metal strip 81. Further, by changing the number of upper recesses 44D provided in the upper rotary blade 44 and the number of lower recesses 47D provided in the lower rotary blade 47, the number of connecting portions 92 per unit length of the perforation slit 90 can be easily changed. Furthermore, by changing the overlapping length in the circumferential direction between the upper recess 44D and the lower recess 47D, the length of the connecting portion 92 can be changed. And each time the perforated metal strip 82 is cut to the product length, since the upper recess 44D and the lower recess 47D are reset to the initial set state, 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 always be aligned.

[0040] In the above embodiments, a form is exemplified in which an oil supply line 49 and an oil supply nozzle 49A parallel to the upper rotary blade portion 41 are arranged in the upper portion of the upper rotary blade portion 41. However, the arrangement 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 also be arranged at 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. Further, a form in which the arrangement of the oil supply line 49 and the oil supply nozzle 49A is omitted may be selected.

[0041] Also, in the above embodiments, a form is exemplified in which an upper concave portion 44D is arranged in the upper disc blade 44B of the upper rotary blade 44, and a lower concave portion 47D is arranged in the lower disc blade 47B of the lower rotary blade 47. However, the present invention is not limited to this form. As shown in FIG. 11, an upper concave portion 44D is arranged in the upper disc blade 44B of the upper rotary blade 44, and a first modified embodiment in which a simple disc blade without a lower concave portion 47D arranged in the lower disc blade 47B of the lower rotary blade 47 is applied can also be adopted. In the following, only the characteristic configurations in each modified embodiment will be described, and other configurations not described will be the same as those in the above-described embodiments.

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

[0043] Further, in the first modified embodiment, although an example is illustrated in which the lower rotary blade portion 42 is driven by the upper rotary blade portion 41 which is a drive shaft by meshing the upper gear G1 and the lower gear G2 as a driving force transmission mechanism, the present invention is not limited to this form. The lower rotary blade portion 42 may adopt a form in which it is rotated by friction with the metal belt-like body 81 with respect to the upper rotary blade portion 41 which is a 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 arrangement angular interval α degrees with respect to the center point O1 of the upper rotary blade 44 of the upper concave portion 44D formed in the upper disk blade 44B of the upper rotary blade 44 is equal to the arrangement angular interval β degrees with respect to the center point O2 of the lower rotary blade 47 of the lower concave portion 47D formed in the lower disk blade 47B of the lower rotary blade 47. Here, only the characteristic configuration in the second modified embodiment will be described, but other configurations not described are the same as those in the above-described embodiments. The operation control unit 200 in the second modified embodiment controls the operations of the upper servo motor 45 and the lower servo motor 48 such that the rotation angle of the upper rotation shaft 43 of the upper rotary blade portion 41 and the rotation angle of the lower rotation shaft 46 of the lower rotary blade portion 42 become α degrees.

[0045] Note that, in the second modified embodiment, the form is such that 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 form. The second modified embodiment is preferably applied even when the wear of the upper disk blade 44B of the upper rotary blade 44 and the lower disk blade 47B of the lower rotary blade 47 is different due to use or polishing.

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

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

[0048] Also, as shown in FIG. 16, the diameter dimension R1 of the upper rotary blade 44 is different from the diameter dimension R2 of the lower rotary blade 47, and the arrangement angular interval α degrees of the upper recess 44D formed in the upper disk 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 angular interval β degrees of the lower recess 47D formed in the lower disk blade 47B of the lower rotary blade 47 with respect to the center point O2 of the lower rotary blade 47. However, a fifth modified embodiment can be adopted in which the arrangement circumferential interval L1 of the upper recess 44D formed in the upper rotary blade 44 is equal to the arrangement circumferential interval L2 of the lower recess 47D formed in the lower rotary blade 47. Here, only the characteristic configuration in the fifth modified embodiment will be described, and other configurations not described are the same as those in the embodiments described above. The operation control unit 200 in the fifth modified embodiment controls the operations of the upper servo motor 45 and the lower servo motor 48 so that the rotation circumferences of the upper rotary blade 44 and the lower rotary blade 47 are equal.

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

[0050] In addition, in the embodiments and modified embodiments described above, a form may be adopted in which a disk blade diameter measurement means (not shown) for measuring the diameter dimension R1 of the upper disk blade 44B and the diameter dimension R2 of the lower disk blade 47B at a preset predetermined operation time interval is additionally provided. In this form, the operation control unit 200 controls the operations of the upper servo motor 45 and the lower servo motor 48 based on the measurement values from the disk blade diameter measurement means and the preset (input in advance by the input means) arrangement angular intervals α of the upper recess 44D and β of the lower recess 47D. Also with this form, the upper recess 44D and the lower recess 47D can be opposed to each other so as to sandwich the metal strip 81 in the plate thickness direction in the formation order of the upper recess 44D and the lower recess 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 operations of the upper servo motor 45 and the lower servo motor 48, it can be based on the rotation angles of the upper rotary shaft 43 and the lower rotary shaft 46 or the rotation circumferences of the upper rotary blade 44 (upper disk blade 44B) and the lower rotary blade 47 (lower disk blade 47B).

[0051] Furthermore, although the stitch slit forming machine 40 in the above embodiments is illustrated in a form where it is disposed at a position between the buffer unit 30 and the cutoff machine 50 in the conveyance direction of the metal strip 81 of the heat exchange fin manufacturing apparatus 100, it is not limited to this form. The stitch slit forming machine 40 may be disposed upstream of the cutoff machine 50 in the conveyance direction of the metal strip 81.

[0052] And in addition to the modified examples described above, it is also possible to adopt a form in which the modified examples and the like described in the embodiments are appropriately combined.

Explanation of Reference Numerals

[0053] 10: Uncoiler 11: Coil 20: Press forming section 21: Oil supply section, 22: Press die, 23: Press mechanism, 24: Hitch feed mechanism 30: Buffer section 40: Sewing machine slit forming machine 41: Upper rotating blade part, 42: Lower rotating blade part, 43: Upper rotating shaft, 44: Upper rotating blade 44A: Upper holding body, 44B: Upper disc blade, 44C: First through hole, 44D: Upper recess 44E: Upper fixing part, 45: Upper servo motor, 46: Lower rotating shaft, 47: Lower rotating blade 47A: Lower holding body, 47B: Lower disc blade, 47C: Second through hole, 47D: Lower recess 47E: Lower fixing 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: Stacking section 71: Stacking pin, 72: Stacking base 80: Aluminum sheet 81: Metal strip, 82: Metal strip with perforations, 83: Product-length metal strip 88: Heat exchange fin, 89: Through hole 90: Sewing machine slit 91: Cutting line, 92: Connecting part 100: Heat exchange fin manufacturing device 200: Operation control section G1: Upper gear (drive force transmission mechanism), G2: Lower gear (drive force transmission mechanism)

Claims

1. A perforation slit forming machine disposed on a conveyance path of a metal strip to form a perforation slit in the metal strip so as to facilitate division of the metal strip formed into a predetermined shape by a press forming section into a product width, the perforation slit forming machine comprising: an upper rotary blade section 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 section 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; a positioning control motor connected to at least one of the upper rotary shaft and the lower rotary shaft; an operation control section for controlling the operation of the positioning control motor; and at least one recess recessed radially inward is provided in at least one of the upper rotary blade and the lower rotary blade in a circumferential direction required length range at an outer peripheral edge; the positioning control motor is connected to the upper rotary shaft to which the upper rotary blade having the recess is attached and the lower rotary shaft to which the lower rotary blade having the recess is attached; A perforation slit forming machine, characterized in that the perforation slit is formed 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 by the upper rotary blade and the lower rotary blade.

2. The upper rotary shaft and the lower rotary shaft are disposed between a buffer section of the metal strip disposed on a feeding side of the press forming section and a cutoff machine that cuts the metal strip into a preset product length, The operation control section controls the operations of the conveyance device and the positioning control motor such that at least one of the feeding length of the metal strip by the conveyance device of the cutoff machine and the rotation circumferential length of the upper rotary blade by the positioning control motor and the rotation circumferential length of the lower rotary blade by the positioning control motor coincide. The perforation slit forming machine according to claim 1.

3. The recess is provided as an upper recess in the upper rotary blade, and the recess is provided as a lower recess in the lower rotary blade. The operation control unit controls the operations of the positioning control motors connected to the upper rotating shaft and the lower rotating shaft so that the upper concave portion and the lower concave portion sandwich the metal strip in the plate thickness direction in the formation order along the circumferential direction according to the angular interval of arrangement in the circumferential direction of the upper concave portion with respect to the center point of the upper rotating blade and the angular interval of arrangement in the circumferential direction of the lower concave portion with respect to the center point of the lower rotating blade. The sewing machine slit forming machine according to claim 1, characterized in that.

4. A driving force transmission mechanism is respectively attached to 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, The sewing machine slit forming machine according to claim 1 or 2, characterized in that 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.

5. The sewing machine slit forming machine according to claim 3, characterized in that the upper concave portion and the lower concave portion are positioned so that the upper rotating blade and the lower rotating blade sandwich the metal strip in a state where the upper concave portion and the lower concave portion face each other.

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

7. The upper rotating shaft and the lower rotating shaft are disposed between a buffer portion of the metal strip disposed on the feeding side of the press forming portion and a cutoff machine that cuts the metal strip to a preset product length, The operation control unit, The sewing machine slit forming machine according to claim 3, characterized in that, during the period when the feeding of the metal strip by the conveying device of the cutoff machine, which occurs in accordance with the timing of cutting the metal strip to the product length by the cutoff machine, is stopped, the positioning control motor is operated to execute a process of returning the position of the concave portion with respect to the metal strip to the initial position.

8. The upper rotating shaft and the lower rotating shaft are disposed between a buffer portion of the metal strip disposed on the feeding side of the press forming portion and a cutoff machine that cuts the metal strip to a preset product length, The operation control unit, While the feeding of the metal strip by the conveying device of the cutoff machine, which occurs in accordance with the timing at which the metal strip is cut to the product length by the cutoff machine, is stopped, the positioning control motor is operated to execute a process of returning the position of the recess with respect to the metal strip to the initial position. The perforation slit forming machine according to claim 4, characterized in that.

9. The upper rotating shaft and the lower rotating shaft are disposed between a buffer portion of the metal strip disposed on the feeding side of the press forming portion and a cutoff machine that cuts the metal strip to a preset product length. The operation control unit While the feeding of the metal strip by the conveying device of the cutoff machine, which occurs in accordance with the timing at which the metal strip is cut to the product length by the cutoff machine, is stopped, the positioning control motor is operated to execute a process of returning the position of the recess with respect to the metal strip to the initial position. The perforation slit forming machine according to claim 5, characterized in that.

10. The upper rotating shaft and the lower rotating shaft are disposed between a buffer portion of the metal strip disposed on the feeding side of the press forming portion and a cutoff machine that cuts the metal strip to a preset product length. The operation control unit While the feeding of the metal strip by the conveying device of the cutoff machine, which occurs in accordance with the timing at which the metal strip is cut to the product length by the cutoff machine, is stopped, the positioning control motor is operated to execute a process of returning the position of the recess with respect to the metal strip to the initial position. The perforation slit forming machine according to claim 6, characterized in that.

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