Trimming device

Abstract

Disclosed is a technique for improving the processing quality of a trimming device. The trimming device of the present disclosure is provided with a short-side-wall cutting machine that cuts the lower edge portions of a pair of short side walls of a box-shaped workpiece, a first long-side-wall cutting machine that cuts the lower edge portions of a first long side wall and a pair of corner portions between the first long side wall and the pair of short side walls, and a second long-side-wall cutting machine that cuts the lower edge portions of a second long side wall and a pair of corner portions between the second long side wall and the pair of short side walls. These side-wall cutting machines have inner-side fitting members that fit into the inner sides of the workpiece, each inner-side fitting member is divided into a main body block and an upper block that overlaps the main body block, and is provided with a pair of spacers for height adjustment that are sandwiched between the lower surface of the upper block and the upper surface of the main body block.

Description

Technical Field

[0001] The present invention relates to a trimming device for cutting off the lower edge of a box-shaped workpiece with an open lower surface and a rectangular planar shape. Background Technology

[0002] Conventional trimming devices include a short sidewall cutter and a long sidewall cutter. The short sidewall cutter cuts the lower edges of a pair of shorter sidewalls with smaller widths on the workpiece, while the long sidewall cutter cuts the lower edges of a pair of longer sidewalls with larger widths, as well as the lower edges of the corners between the longer and shorter sidewalls. Specifically, both the short and long sidewall cutters include an inner fitting member that engages with the workpiece, a pressing member that presses the workpiece against the inner fitting member from above, and a pair of sliding blades facing the lower edges of the workpiece from both sides. Furthermore, by having the workpiece engaged with the inner fitting member, the pair of sliding blades reciprocate horizontally, thereby cutting off the opposing lower edges of the workpiece as described above. Additionally, the inner fitting member is divided into a main block and an upper block, and the vertical position of the upper block is controlled by a servo motor. Furthermore, this position control allows for the adjustment of the step between the cut portion cut by the short sidewall cutter and the cut portion cut by the long sidewall cutter on the lower surface of the workpiece (for example, see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-292438 ( Figure 1 (Section

[0062] ) Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, the aforementioned steps may occur at four locations on the lower surface of the workpiece processed by the aforementioned dressing device. Specifically, steps may occur at two locations near the long sidewall of one of the pair of short sidewalls on the lower surface of the workpiece during cutting operations performed by the sliding blade of one sidewall cutting machine, and at two locations near the long sidewall of the other pair of short sidewalls on the lower surface of the workpiece during cutting operations performed by the sliding blade of the other sidewall cutting machine, totaling four locations. However, in the aforementioned conventional dressing devices, it is sometimes impossible to fully suppress all four locations of steps, sometimes resulting in processing quality problems.

[0008] The present invention was made in view of the above circumstances, and discloses a technique for improving the processing quality of a dressing device.

[0009] Solution for solving the problem

[0010] The first aspect of the invention disclosed herein, completed to achieve the aforementioned objective, is a trimming device that cuts off the lower edge of a workpiece integrally. The workpiece is a box-shaped structure with an open lower surface, viewed from above as a rectangle, and has a pair of short sidewalls located along a pair of short sides of the rectangle, and a first and second long sidewalls located along a pair of long sides of the rectangle as sidewalls. The trimming device separately comprises: a short sidewall cutting machine that cuts off the lower edge of the pair of short sidewalls; a first long sidewall cutting machine that cuts off the lower edge of the first long sidewall and the lower edge of a pair of corners between the first long sidewall and the pair of short sidewalls; and a second long sidewall cutting machine that cuts off the lower edge of the second long sidewall and the lower edge of a pair of corners between the second long sidewall and the pair of short sidewalls. The sidewall cutting machine, the first long sidewall cutting machine, and the second long sidewall cutting machine each include: an inner fitting member, which is rectangular in plan view and fits into the inner side of the workpiece; a pressing member that presses the workpiece against the inner fitting member from above; and an inner cutting member and an outer cutting member, which are separately arranged on the inner and outer sides of the workpiece and slide relative to each other in the horizontal direction to cut off the lower edge of the workpiece. Each of the inner fitting members of the first long sidewall cutting machine and the second long sidewall cutting machine is divided into a main block and an upper block that overlaps the main block, and has a pair of spacers for height adjustment, which are arranged at two positions in the long side direction of the rectangle in plan view of each inner fitting member and sandwiched between the lower surface of the upper block and the upper surface of the main block. Attached Figure Description

[0011] Figure 1 This is a perspective view of a workpiece according to one embodiment of the present invention.

[0012] Figure 2 It is a three-dimensional diagram of the trimming device.

[0013] Figure 3 This is a side sectional view obtained by observing the short sidewall cutting machine from the first horizontal direction.

[0014] Figure 4 This is a 3D view of a short sidewall cutting machine.

[0015] Figure 5 This is a three-dimensional view of the outer blade component taken from below.

[0016] Figure 6A This is a side view of the upper block. Figure 6B This is a bottom view of the upper block of the short sidewall cutting machine. Figure 6C This is a bottom view of the upper block of the first long sidewall cutting machine.

[0017] Figure 7 This is a side sectional view obtained by observing a portion of the short sidewall cutting machine from the second horizontal direction.

[0018] Figure 8 This is a side sectional view obtained by observing the first long sidewall cutting machine from the first horizontal direction.

[0019] Figure 9 This is a side sectional view obtained by observing the first long sidewall cutting machine from the second horizontal direction.

[0020] Figure 10 This is a side sectional view obtained by observing the first long sidewall cutting machine from the second horizontal direction. Detailed Implementation

[0021] The following is based on Figures 1-10 To illustrate one embodiment of the present invention. Figure 1 (a) shows the trimming device 10 of this embodiment (refer to) Figure 2 The workpiece 90 is a square tube with a bottom at the top and an open bottom surface. Its cross-sectional shape is rectangular, and it has a pair of short sidewalls 91 on the short side of the rectangle, a pair of long sidewalls 92 on the long side, and an upper wall 93.

[0022] Furthermore, the workpiece 90 is manufactured, for example, by repeatedly drawing a metal sheet using a multi-station transfer press (not shown). Therefore, the workpiece 90 sometimes has a curved shape (not shown) at the opening end faces of the short sidewall 91 and long sidewall 92, or a height difference from the upper wall 93 to the opening end faces of the short sidewall 91 and long sidewall 92. To address this, in order to standardize the workpiece 90 to a predetermined height and to flatten the opening end faces of the short sidewall 91 and long sidewall 92, the trimming device 10 of this disclosure trims the opening edge (lower edge) of the workpiece 90.

[0023] It should be noted that in the dressing apparatus 10 of this embodiment, the pair of long sidewalls 92 of the workpiece 90 are processed separately. Therefore, in the following description of the separation of the pair of long sidewalls 92, Figure 1 The long sidewall 92 on the left side of each workpiece 90 shown is called the "first long sidewall 92". Figure 1 The long sidewall 92 on the right side of each workpiece 90 shown is called the "second long sidewall 92".

[0024] like Figure 2As shown, the trimming device 10 includes a short sidewall cutter 20 for trimming a pair of short sidewalls 91 of a workpiece 90, a first long sidewall cutter 50A for trimming a first long sidewall 92, and a second long sidewall cutter 50B for trimming a second long sidewall 92, arranged at equal intervals along the horizontal direction. Hereinafter, the arrangement direction of the short sidewall cutter 20, the first long sidewall cutter 50A, and the second long sidewall cutter 50B will be referred to as the "first horizontal direction H1," and the direction orthogonal to the first horizontal direction H1 will be referred to as the "second horizontal direction H2." Furthermore, without distinguishing between the short sidewall cutter 20, the first long sidewall cutter 50A, and the second long sidewall cutter 50B, they will be simply referred to as "sidewall cutters 20, 50A, and 50B."

[0025] In addition to the sidewall cutters 20, 50A, and 50B, the trimming device 10 also includes: a conveying device 11 that transports the workpiece 90 in the order of the short sidewall cutter 20, the first long sidewall cutter 50A, and the second long sidewall cutter 50B; and a pressing device that includes a pressing member 70 for pressing the workpiece 90 toward each of the sidewall cutters 20, 50A, and 50B.

[0026] The conveying device 11 is configured with a pair of guide rail members 13 facing each other in the second horizontal direction H2 and extending along the first horizontal direction H1, on which four pairs of clamping members 12 are assembled. Each pair of clamping members 12 is separately fixed to a pair of guide rail members 13 and faces each other in the second horizontal direction H2, and has a square groove 12A extending vertically on their opposing surfaces. Furthermore, in the first horizontal direction H1, the clamping members 12 are arranged at equal intervals, the interval between these clamping members 12 being the same as the interval between the sidewall cutting machines 20, 50A, and 50B. The guide rail members 13 reciprocate along the first horizontal direction H1 with a transport stroke of the same length as the interval between the clamping members 12, and repeatedly perform opening and closing operations that bring the guide rail members 13 closer together and separate them.

[0027] like Figure 2 As shown, the pressing member 70 of the pressing device fixes the lower ends of a pair of shaft portions 28 extending in the vertical direction to the lower pressing block 27, and the pressing member 70 is respectively positioned directly above the side wall cutting machines 20, 50A, and 50B. Furthermore, the upper ends of the shaft portions 28 are connected to a lifting drive unit that uses a cylinder (not shown) as a drive source. It should be noted that the lower pressing block 27 of the pressing member 70 is, for example, a strip extending in the second horizontal direction H2, and the planar shape of this lower pressing block 27 is slightly smaller than the planar shape of the workpiece 90.

[0028] exist Figures 3-7 The structure of the short sidewall cutting machine 20 is shown in detail. (For example...) Figure 3As shown, the short sidewall cutting machine 20 includes: an inner fitting member 40 that fits into the inner side of the workpiece 90; an outer fitting portion 21 that fits into the outer side of the workpiece 90; and an outer blade member 23 that has a receiving hole 23K for receiving the lower part of the inner fitting member 40 and supports the outer fitting portion 21 from below.

[0029] like Figure 4 As shown, the outer fitting portion 21 has a pair of supporting prisms 22 facing each other in the second horizontal direction H2 and extending in the vertical direction, these supporting prisms 22 as follows: Figure 3 The installation shown is in a state where it overlaps the upper surface of the outer blade member 23. Additionally, as... Figure 4 As shown, square grooves 22A extending in the vertical direction are formed on the opposing surfaces of the two supporting prisms 22. The inner surface of the upper end of each square groove 22A is inclined in a manner that gradually widens in both the second horizontal direction H2 and the first horizontal direction H1 as it tends upward.

[0030] like Figure 4 As shown, the lower surface of the outer cutting edge member 23 has a pair of crossbeam portions 23J extending along the second horizontal direction H2 at both ends of the first horizontal direction H1. Figure 4 In the image, only one of the crossbeam portions 23J is shown. This pair of crossbeam portions 23J is fixed in a state of abutting against the upper surface of the support block 29.

[0031] like Figure 5 As shown, on the lower surface of the outer cutting edge member 23, a pair of opposing protrusions 23T are provided on each of the two sides of the receiving hole 23K clamped in the second horizontal direction H2. Figure 5 In the diagram, only one pair of opposing protrusions 23T are shown. The opposing protrusions 23T extend along the second horizontal direction H2 and are at the same height as the crossbeam portion 23J, and abut against the upper surface of the support block 29.

[0032] The spacing between the opposing surfaces of the pair of opposing protrusions 23T in the first horizontal direction H1 is slightly smaller than the spacing between the pair of long sidewalls 92 in the workpiece 90. Furthermore, the horizontal edge portion formed by the intersection of the portions at both ends of the inner surface of the receiving hole 23K in the second horizontal direction H2 and the lower surface of the outer cutting edge member 23 forms the first outer cutting edge 25A. Additionally, a pair of second outer cutting edges 25B are formed at the edges of the opposing protrusions 23T extending downward on both sides of the first outer cutting edge 25A, and these first outer cutting edges 25A and second outer cutting edges 25B constitute the outer cutting edge 25.

[0033] A guide square 23G is installed between the opposing protrusions 23T on the first horizontal direction H1 (refer to...). Figure 3 ).like Figure 4As shown, the guide square 23G has an inclined surface at one end of the prism extending along the second horizontal direction H2 between the opposing protrusions 23T, on the side of the receiving hole 23K, and is positioned at a position separated from the receiving hole 23K. Furthermore, a discharge path 23B is formed at a position closer to the receiving hole 23K than the inclined surface of each guide square 23G, for discharging debris cut from the workpiece 90 by the outer cutting edge 25 and the inner cutting edge 35 (described later). Additionally, a discharge groove 29B is formed below each discharge path 23B in the support block 29 for discharging debris downwards from the support block 29.

[0034] like Figure 4 As shown, in a pair of crossbeams 23J (in Figure 4 The inner blade member 32 and a pair of auxiliary sliding members 31 are housed between the crossbeam portion 23J (shown only on one side). Figure 4 Only one side of the auxiliary slider 31 is shown in the image.

[0035] The inner cutting edge member 32 is sized to fit perfectly inside the lower end of the workpiece 90, and its height is precisely between the lower surface of the outer cutting edge member 23 and the upper surface of the support block 29. Furthermore, the inner cutting edge member 32 has inner cutting edges 35 at both ends in the second horizontal direction H2. Specifically, Figure 5 The upper surface of the inner blade member 32 intersects with the end face of the second horizontal direction H2 to form a horizontal edge portion, forming a first inner blade 35A, and a pair of second inner blades 35B are formed on the vertically extending edge portions on both sides of the first inner blade 35A. These first inner blades 35A and second inner blades 35B constitute the inner blade 35.

[0036] A pair of auxiliary sliding members 31 are slightly smaller than the inner cutting member 32 in the second horizontal direction H2. Furthermore, the auxiliary sliding members 31 are fixed to the two sides of the inner cutting member 32, and the two ends of the inner cutting member 32 in the second horizontal direction H2 protrude slightly from the auxiliary sliding members 31.

[0037] Furthermore, the upper surface of the auxiliary slider 31 is stepped down along the edge of the inner cutting member 32, so that the workpiece 90 fitted into the inner cutting member 32 does not interfere with the auxiliary slider 31. The movable unit 32K, composed of these inner cutting members 32 and a pair of auxiliary sliders 31, is restricted from moving in the first horizontal direction H1 by a pair of crossbeams 23J, and its vertical movement is restricted by the lower surface of the outer cutting member 23 and the upper surface of the support block 29, allowing it to slide only in the second horizontal direction H2. Additionally, the movable unit 32K receives power from a drive source (servo motor, pneumatic actuator, etc.) not shown, for example, via a shaft (not shown) connected to one end face of the auxiliary slider in the second horizontal direction H2.

[0038] like Figure 4As shown, the inner fitting member 40 is divided into a main body block 33 and an upper block 42. The main body block 33 is a flat block shape that can fit into the workpiece 90. Its planar shape is slightly smaller in the second horizontal direction H2 than that of the inner cutting member 32, but the same in the first horizontal direction H1. Furthermore, as... Figure 3 As shown, near both ends of the second horizontal direction H2 in the main body block 33 and the inner blade member 32, a pair of through holes 33A extend vertically. On the extension line of the through holes 33A in the support block 29, a through hole 29C with an inner diameter larger than the through holes 33A extends vertically. Furthermore, a pair of shaft portions 34 are inserted into the pair of through holes 29C and 33A, and the lower ends of these shaft portions 34 are connected to the output portion of the lifting drive unit (not shown).

[0039] The lifting drive unit uses a servo motor as a drive source, and includes a power conversion mechanism that receives the rotational output of the servo motor via an input unit and converts the rotational output into linear movement of the output unit. Examples of such a power conversion mechanism include rack and pinion, ball screw mechanism, crank mechanism, and cam mechanism. Furthermore, the output unit of the power conversion mechanism is configured to move linearly in the vertical direction, and the lower ends of a pair of shafts 34 are connected to its output unit.

[0040] The upper block 42 is connected to the upper end of the shaft portion 34. The upper block 42 has a height of, for example, 1 / 10 to 1 / 3 of that of the main body block 33, and has a planar cross-sectional shape that is approximately the same as that of the main body block 33. Additionally, as... Figure 6A As shown, a pair of through holes 43 are formed near both ends of the second horizontal direction H2 in the upper block 42. Each through hole 43 has countersunk portions 43B and 43C at both ends, with the upper end of a shaft portion 34 fitted into the countersunk portion 43B on the lower side. Furthermore, an internal threaded hole 34N is formed at the center of the upper end of the shaft portion 34. A bolt B1, passing through the through hole 43 from above, is screwed into the internal threaded hole 34N, and the head of the bolt B1 is received in the countersunk portion 43C without protruding from the upper surface of the upper block 42.

[0041] At two locations on the lower surface of the upper block 42, along its long side (second horizontal direction H2), closer to the end of the pair of through holes 43, a pair of grooves 42M are formed, extending through the upper block 42 along its short side (first horizontal direction H1), and a pair of internally threaded holes 42E opening at the bottom surface of these grooves 42M. A pair of spacers 45 are fitted into the grooves 42M. The spacers 45 are cuboids extending along the short side (first horizontal direction H1) of the upper block 42, and their total length is slightly smaller than the width of the upper block 42 along its short side. Furthermore, a through hole 46 with a countersunk portion 46B is formed at the center of the spacer 45 along its long side. A bolt B2, passing through the through hole 46, is fastened to the internally threaded hole 42E, with the head of the bolt B2 received in the countersunk portion 46B and not protruding from the lower surface of the spacer 45.

[0042] like Figure 6A As shown, multiple upper surface grooves 42F are formed on the upper surface of the upper block 42 by slightly recessing multiple positions in the long side direction. The multiple upper surface grooves 42F extend along the entire short side direction (first horizontal direction H1) of the upper block 42.

[0043] It should be noted that the first and second long sidewall cutting machines 50A and 50B, described later, also each have an upper block 42. Furthermore, in the upper block 42 of the short sidewall cutting machine 20, as... Figure 6B As shown, the pair of through holes 43 are positioned at the center of the short side direction (first horizontal direction H1) of the upper block 42. Conversely, in the upper blocks 42 of the first and second long sidewall cutting machines 50A and 50B, as shown... Figure 6C As shown, a pair of through holes 43 are configured to be slightly offset to one side from the center of the upper block 42 in the direction of the short side (first horizontal direction H1).

[0044] The above describes the structure of the short sidewall cutting machine 20. Next, the operation of the conveying device 11 and the short sidewall cutting machine 20 will be explained.

[0045] Workpiece 90 is transported by conveying device 11 as follows. First, it is positioned at one end of the transport stroke (hereinafter referred to as the "starting end" and conversely as the "ending end") with a pair of guide rail members 13 open. In this state, workpiece 90 is supplied from the multi-station press between a pair of clamping members 12 on the starting end side. Then, the guide rail members 13 close, and workpiece 90 is clamped in the square slots 12A of the pair of clamping members 12 on the starting end side, and the guide rail members 13 move towards the ending end of the transport stroke. As a result, workpiece 90 moves directly above the outer fitting portion 21 of the short sidewall cutter 20. In this state, the upper block 42 of the short sidewall cutter 20 rises, and workpiece 90 is clamped from the vertical direction by the upper block 42 and the pressing member 70. Furthermore, the guide rail member 13 opens, and the pressing member 70 and the upper block 42 descend together with the workpiece 90, thus placing the workpiece 90 in the short sidewall cutting machine 20 as described below. During this period, the guide rail member 13 moves towards the beginning of the transport stroke and waits. When the processing of the workpiece 90 by the short sidewall cutting machine 20 is completed, the pressing member 70 and the upper block 42 rise together with the workpiece 90, and the workpiece 90 is positioned between the pair of clamping members 12 waiting above. At this time, the workpiece 90 from the multi-station press is supplied between the pair of clamping members 12 on the beginning side. Hereinafter, by repeatedly performing the same operation, the workpiece 90 is intermittently transported from the multi-station press to the short sidewall cutting machine 20, the first long sidewall cutting machine 50A, and the second long sidewall cutting machine 50B, and then to the workpiece discharge section (not shown).

[0046] The short sidewall cutting machine 20 operates as follows: When the workpiece 90, before being processed by the short sidewall cutting machine 20, is lowered by being clamped by the upper block 42 and the pressing member 70 of the short sidewall cutting machine 20, the workpiece 90 engages with the outer engaging portion 21 and the inner engaging member 40. Furthermore, in... Figure 3 When the pair of spacers 45 on the lower surface of the upper block 42 abut against the main body block 33 of the inner fitting member 40, the descent of the upper block 42 and the pressing member 70 stops, and the workpiece 90 is maintained in a state receiving pressing pressure from the pressing member 70. Thus, the setting of the workpiece 90 towards the short sidewall cutting machine 20 is completed. At this time, at the lower end of the workpiece 90, as... Figure 7 As shown, the lower edge of the short sidewall 91 is positioned between the outer cutting edge 25 and the inner cutting edge 35. In this state, the inner cutting edge member 32 reciprocates along the second horizontal direction H2. Thus, as... Figure 1 In (b), the lower edge of the short sidewall 91 of the workpiece 90 is horizontally cut to form a first cut surface 95, and a pair of longitudinal cut surfaces 96 extending downward from both ends of the first cut surface 95 are formed. The ends of the short sidewall 91 are cut off in a quadrilateral shape. Furthermore, the workpiece 90 is in a state having a pair of hanging tabs 94.

[0047] When the above-mentioned cutting process is completed, the upper block 42 and the pressing member 70 rise as described above, and the workpiece 90 is transferred to the conveying device 11.

[0048] It should be noted that the inner fitting member 40 of the short sidewall cutting machine 20 moves together with the inner cutting blade member 32 relative to the workpiece 90 along the second horizontal direction H2, but if Figure 4 As shown, multiple upper surface grooves 42F are formed on the upper surface of the inner fitting member 40, resulting in a smaller contact area with the workpiece 90, making it easier to slide. Therefore, the sliding resistance between the inner fitting member 40 and the workpiece 90 can be suppressed. The same applies to the inner fitting member 40 of the first and second long sidewall cutting machines 50A and 50B described later.

[0049] The above is a description of the structure and operation of the short sidewall cutting machine 20. Next, refer to... Figures 8-10 Only the structure of the first long sidewall cutter 50A that differs from the short sidewall cutter 20 will be described. Structures identical to those of the short sidewall cutter 20 will be labeled with the same reference numerals and repeated descriptions will be omitted.

[0050] like Figure 8 As shown, in the first long sidewall cutting machine 50A, a pair of crossbeam portions 23J of the outer blade member 23 are arranged opposite each other in the second horizontal direction H2. Furthermore, the inner blade member 54 of the first long sidewall cutting machine 50A is clamped by the pair of crossbeam portions 23J in the second horizontal direction H2, and is clamped from the lower surface of the outer blade member 23 and the upper surface of the support block 29 from the vertical direction, and is supported so that it can only slide in the first horizontal direction H1. In addition, the inner blade member 54 receives power for movement in the first horizontal direction H1 from a drive source (not shown) via a shaft (not shown) connected to one end face of the first horizontal direction H1.

[0051] like Figure 9 As shown, the inner cutting member 54 has a pair of sidewall receiving grooves 54A that extend vertically. The pair of sidewall receiving grooves 54A extend along the second horizontal direction H2, and the portion of the inner cutting member 54 that is sandwiched between the pair of sidewall receiving grooves 54A becomes the core portion 54H.

[0052] Furthermore, the inner fitting member 40 of the first long sidewall cutting machine 50A is slightly smaller than the core 54H in the first horizontal direction H1. The main body block 33 of the inner fitting member 40 is fixed to the core 54H, for example, with one side of the core 54H and one side of the core 54H being approximately coplanar. The edge formed by the intersection of the other side of the core 54H and the upper surface becomes the inner blade 55. Corresponding to the inner blade 55, the portion of the edge formed by the intersection of the lower surface of the outer blade member 23 and the inner surface of the receiving hole 23K, which is parallel to the inner blade 55, becomes the outer blade 52. A discharge groove 29B is formed below the sidewall receiving groove 54A on the side facing the outer blade 52 and the inner blade 55 in the support block 29.

[0053] It should be noted that, as described above, the main body block 33 is positioned on one side of the core 54H relative to the first horizontal direction H1. Therefore, the through hole 33A for the shaft portion 34 is positioned on the other side of the main body block 33 relative to the first horizontal direction H1. Correspondingly, as described above, the through hole 43 in the upper block 42 is also positioned on the other side of the first horizontal direction H1 (see reference). Figure 6C ).

[0054] The above is a description related to the structure of the first long sidewall cutting machine 50A. The second long sidewall cutting machine 50B is configured to rotate the first long sidewall cutting machine 50A by 180 degrees. The structure of one side of the first horizontal direction H1 in the second long sidewall cutting machine 50B is the same as the structure of the other side of the first horizontal direction H1 in the first long sidewall cutting machine 50A, and the structure of the other side of the first horizontal direction H1 in the second long sidewall cutting machine 50B is the same as the structure of one side of the first horizontal direction H1 in the first long sidewall cutting machine 50A.

[0055] Next, the operation of the first long sidewall cutting machine 50A and the second long sidewall cutting machine 50B will be explained. As described above, the workpiece 90, whose short sidewall 91 has been trimmed by the short sidewall cutting machine 20, is transported to the first long sidewall cutting machine 50A by the conveying device 11, and is positioned on the first long sidewall cutting machine 50A in the same manner as the short sidewall cutting machine 20. Thus, the pair of hanging pieces 94 of the workpiece 90 (refer to...) Figure 1 )like Figure 10 The state shown is that a pair of sidewall receiving grooves 54A protruding into the inner cutting edge member 54 are arranged near the lower end of one of the long sidewalls 92 between the inner cutting edge 55 and the outer cutting edge 52.

[0056] In this state, the inner cutting edge member 54 returns to its original position after moving towards the outer cutting edge 52. Thus, as... Figure 1As shown in (c), only one of the pair of hanging pieces 94 of the workpiece 90 is removed. In detail, the lower edge of the first long sidewall 92 in the workpiece 90 and the lower edge of the pair of corners 90C between the first long sidewall 92 and the pair of short sidewalls 91 are removed by the first long sidewall cutter 50A to form a second cut surface 97A.

[0057] After the workpiece 90 is cut by the first long sidewall cutter 50A, it is transported by the conveying device 11 and placed on the second long sidewall cutter 50B. Furthermore, the second long sidewall cutter 50B performs the same cutting process as the first long sidewall cutter 50A, and so on... Figure 1 As shown in (d), the remaining hanging pieces 94 in the workpiece 90 are removed. Specifically, the lower edge of the second long sidewall 92 and the lower edge of the pair of corner portions 90C between the second long sidewall 92 and the pair of short sidewalls 91 in the workpiece 90 are removed by the first long sidewall cutter 50A to form a third cut surface 97B. After the cutting process performed by the second long sidewall cutter 50B is completed, the workpiece 90 is transported to the workpiece discharge section by the conveying device 11.

[0058] The above is a description related to the structure and operation of the trimming device 10 of this embodiment. Next, a method for manufacturing a container using the trimming device 10 of this embodiment will be described.

[0059] Multiple workpieces 90 are supplied from the multi-station press to the dressing device 10 as unfinished containers. Furthermore, using the multiple workpieces 90, adjustments are sequentially made to the short sidewall cutter 20, the first long sidewall cutter 50A, and the second long sidewall cutter 50B.

[0060] The adjustment of the short sidewall cutting machine 20 is as follows. That is, the workpiece 90 supplied from the multi-station press is processed by the short sidewall cutting machine 20, and as... Figure 1 As shown in (b), a pair of first cutting surfaces 95 are added to the workpiece 90. Furthermore, the heights of the pair of first cutting surfaces 95 from the workpiece 90 to the upper surface of the workpiece 90 are measured such that the difference between the measured values ​​of these heights (hereinafter referred to as "a pair of height measured values") and the predetermined height specified value converges within a predetermined allowable size range, thereby adjusting the height of the pair of spacers 45 of the short sidewall cutting machine 20.

[0061] Specifically, the initial height of the pair of spacers 45 is set such that the measured height is larger than the specified height by an amount exceeding the allowable dimensional range. Furthermore, based on the difference between the measured height and the specified height, the lower or upper surface of the pair of spacers 45 of the short sidewall cutting machine 20 is ground or cut. Grinding or the like of each spacer 45 can be performed while the pair of spacers 45 is mounted on the upper block 42, or it can be performed after removing the pair of spacers 45 from the upper block 42. Furthermore, when grinding or the like of each spacer 45 is performed while the pair of spacers 45 is mounted on the upper block 42, the upper block 42 can be fixed to the shaft portion 34, or it can be removed from the shaft portion 34.

[0062] Furthermore, the workpiece 90 is processed using the short sidewall cutting machine 20, which has completed grinding of the spacer 45, etc. It is then confirmed whether a pair of height measurements are consistent with the specified height within the allowable dimensional range. If they are inconsistent, the above steps are repeated; if they are consistent, the adjustment of the short sidewall cutting machine 20 is complete. It should be noted that if the spacer 45 is excessively ground during the above adjustment, it can be replaced with a new spacer 45 and ground.

[0063] The adjustment of the first long sidewall cutting machine 50A is as follows. That is, the workpiece 90 processed by the short sidewall cutting machine 20 after the adjustment is completed is processed by the first long sidewall cutting machine 50A, as follows. Figure 1 As shown in (c), a second cutting surface 97A is added to the workpiece 90. Furthermore, the height of the step between the second cutting surface 97A and the pair of first cutting surfaces 95 of the workpiece 90 is measured, and the height of the pair of spacers 45 of the first long sidewall cutting machine 50A is adjusted such that the measured values ​​of these steps (hereinafter referred to as "pair of step measured values") are less than a predetermined specified size (e.g., 0.05 mm). Specifically, the initial height of the pair of spacers 45 is a height greater than the specified size of the pair of step measured values. And, depending on the size of the pair of step measured values, similar to the case of the short sidewall cutting machine 20, the pair of spacers 45 of the first long sidewall cutting machine 50A is ground, etc. Here, if the pair of step measured values ​​are the same size, the pair of spacers 45 of the first long sidewall cutting machine 50A is ground, etc., by the same amount, so that the pair of step measured values ​​are less than the specified size. Furthermore, if the measured values ​​of a pair of steps are different, the pair of spacers 45 are ground with different amounts according to each step's measured value until the measured values ​​of the pair of steps are below the specified size. Then, the workpiece 90 is processed using the first long sidewall cutting machine 50A, which has completed the grinding of the spacers 45, to confirm whether both of the measured values ​​of the pair of steps are below the specified size. If they are not below the specified size, the above operation is repeated; if they are below the specified size, the adjustment of the first long sidewall cutting machine 50A is complete.

[0064] The adjustment of the second long sidewall cutting machine 50B is as follows. That is, the workpiece 90 processed by the first long sidewall cutting machine 50A after the adjustment is completed is processed by the second long sidewall cutting machine 50B, as follows. Figure 1 As shown in (d), a third cutting surface 97B is added to the workpiece 90. Furthermore, the height of the step between the third cutting surface 97B and the pair of first cutting surfaces 95 of the workpiece 90 is measured. Hereinafter, similar to the case of the first long sidewall cutting machine 50A, the height of the pair of spacers 45 of the second long sidewall cutting machine 50B is adjusted.

[0065] As described above, after the sidewall cutting machines 20, 50A, and 50B are adjusted, the trimming device 10 operates continuously, and the workpiece 90 with its lower edge trimmed is manufactured into a container.

[0066] As described above, the dressing apparatus 10 of this embodiment simplifies the adjustment operation for suppressing steps at four positions on the lower surface of the workpiece 90 by dividing the conventionally single long sidewall cutting machine into first and second long sidewall cutting machines 50A and 50B, thereby enabling the complete suppression of steps at all four positions. In other words, the dressing apparatus 10 of this embodiment improves the processing quality compared to conventional dressing apparatuses.

[0067] [Other Implementation Methods]

[0068] In the embodiment described above, the sidewall cutting machines 20, 50A, and 50B are adjusted by grinding a pair of spacers 45, etc. However, multiple types of spacers 45 with different heights can be prepared in advance and the spacers 45 can be replaced for adjustment.

[0069] In the embodiment, a pair of spacers 45 are fixed to the upper block 42 side, but they can also be fixed to the main block 33 side.

[0070] In the embodiment described, each spacer 45 is rectangular, but not limited to this. For example, it can also be a cylinder with its central axis parallel to the vertical direction, or a structure made of stacked thin plates.

[0071] In the described embodiment, each upper block 42 has a pair of spacers 45, but it is also possible to configure the pair of spacers 45 to be divided into two in the short side direction (first horizontal direction H1) of the upper block 42, thus having four spacers 45. If configured in this way, more precise adjustments can be made.

[0072] In the described embodiment, the first and second long sidewall cutting machines 50A and 50B are respectively asymmetrically constructed in the first horizontal direction H1, for example, having only one discharge slot 29B (see reference). Figure 9It can only cut one hanging piece 94, but it can also be configured such that the first and second long sidewall cutting machines 50A and 50B are symmetrical in the first horizontal direction H1 and can cut a pair of hanging pieces 94, but only cut one hanging piece 94 at a time.

[0073] <Postscript>

[0074] Hereinafter, the feature groups extracted from the above embodiments will be explained as needed, while showing the effects, etc. It should be noted that, for ease of understanding, the reference numerals of the specific structures corresponding to the above embodiments will be appropriately shown by adding parentheses, etc., but these feature groups are not limited to the specific structures shown by adding such parentheses, etc.

[0075] [Feature 1]

[0076] A trimming device (10) cuts off the lower edge of a workpiece (90) which is box-shaped with an open lower surface and a rectangular planar shape, and has a pair of short sidewalls (91) on a pair of short sides of the rectangle and a first long sidewall and a second long sidewall (92) on a pair of long sides of the rectangle as sidewalls. The trimming device (10) separately comprises: a short sidewall cutting machine (20) that cuts off the lower edge of the pair of short sidewalls (91); and a first long sidewall and a second long sidewall (92) on a pair of long sides of the rectangle. A sidewall cutting machine (50A) cuts off the lower edge of the first long sidewall (92) and the lower edge of a pair of corners (90C) between the first long sidewall (92) and the pair of short sidewalls (91); and a second long sidewall cutting machine (50B) cuts off the lower edge of the second long sidewall (92) and the lower edge of a pair of corners (90C) between the second long sidewall (92) and the pair of short sidewalls (91), in the case of the short sidewall cutting machine (20) and the first long sidewall... The wall cutting machine and the second long side wall cutting machine (50A, 50B) respectively include: an inner fitting member (40) having a rectangular planar shape and fitting into the inner side of the workpiece (90); a pressing member (70) that presses the workpiece (90) against the inner fitting member (40) from above; and an inner cutting member (32, 54) and an outer cutting member (23) that are separately arranged on the inner and outer sides of the workpiece (90) and slide relative to each other in the horizontal direction to cut the workpiece (90). The lower edge of the 0) is cut off, and the inner fitting members (40) of the first long sidewall cutter and the second long sidewall cutter (50A, 50B) are divided into a main block (33) and an upper block (42) that overlaps the main block (33). They are equipped with a pair of spacers (45) for height adjustment, which are arranged at two positions in the long side direction of the rectangle as the planar shape and sandwiched between the lower surface of the upper block (42) and the upper surface of the main block (33).

[0077] [Feature 2]

[0078] According to feature 1, the trimming device (10) has a pair of grooves (42M) that pass through two positions along the short side of the long side of the lower surface of the upper block (42) or the upper surface of the main block (33), and the pair of spacers (45) are rectangular parallelepiped that fit perfectly into the pair of grooves (42M).

[0079] [Feature 3]

[0080] According to feature 1 or 2, the trimming device (10) wherein each of the inner fitting members (40) of the short sidewall cutter (20), the first long sidewall cutter, and the second long sidewall cutter (50A, 50B) is divided into a main block (33) and an upper block (42) overlapping the main block (33), and has a shaft portion (34) hanging down from the upper block (42) and a through hole (33A) formed in the main block (33) through which the shaft portion (34) passes. The trimming device (10) has a lifting drive unit that is connected to the lower part of the shaft portion (34) and causes the upper block (42) and the shaft portion (34) to rise and fall together to disengage the workpiece (90) from the main block (33).

[0081] [Feature 4]

[0082] According to feature 3, the trimming device (10) is provided in pairs and is located at two positions near the two ends of the long side of the upper block (42) which is a rectangular shape in planar shape, and the pair of spacers (45) are respectively located at adjacent positions to the end of the upper block (42) in the long side direction of the pair of shafts (34).

[0083] [Feature 5]

[0084] A method for manufacturing a container, wherein a box-shaped container with one open side is manufactured using a trimming device (10) as described in any one of features 1 to 4, wherein the pair of spacers (45) of the first long sidewall cutter (50A) are adjusted in such a manner that the step between the cut surfaces (95) of the pair of short sidewalls (91) formed by the short sidewall cutter (20) and the cut surfaces (97A) of the pair of corner portions (90C) formed by the first long sidewall cutter (50A) becomes a predetermined size. The height difference is adjusted such that the step between the cut surface (95) of the pair of short sidewalls (91) formed by the short sidewall cutter (20) and the cut surface (97B) of the pair of corner portions (90C) formed by the second long sidewall cutter (50B) is adjusted to a predetermined size, and then the lower edge of the workpiece (90) is cut off entirely by the trimming device (10) to manufacture the container.

[0085] In the finishing apparatus of features 1 to 4, the conventional long sidewall cutting machine is divided into a first long sidewall cutting machine that cuts the lower edge of the first long sidewall of the workpiece and the lower edge of a pair of corners between the first long sidewall and a pair of short sidewalls, and a second long sidewall cutting machine that cuts the lower edge of the second long sidewall of the workpiece and the lower edge of a pair of corners between the second long sidewall and a pair of short sidewalls. Furthermore, a pair of spacers for height adjustment are provided between the main body block and the upper block of each inner fitting member of the first and second long sidewall cutting machines. Thus, by adjusting the height of the pair of spacers of the first long sidewall cutting machine, adjustments can be made to suppress steps at two locations near the first long sidewall that may be generated by the cutting process of the first long sidewall cutting machine on the lower surface of the pair of short sidewalls of the workpiece. Here, if the steps at the two locations are of the same height, the steps at both locations can be suppressed by lowering or raising the pair of spacers of the first long sidewall cutting machine by the same amount. Furthermore, if the steps at two locations have different heights, the steps at both locations can be suppressed by lowering or raising a pair of spacers by different sizes according to the difference in the height of the steps at the two locations. Similarly, by adjusting the height of a pair of spacers in the second long sidewall cutting machine, adjustments can be made to suppress steps at two locations near the second long sidewall on the lower surface of a pair of short sidewalls of the workpiece. Thus, according to the dressing device of features 1 to 4, by dividing the previously single long sidewall cutting machine into a first long sidewall cutting machine for the first long sidewall of the workpiece and a second long sidewall cutting machine for the second long sidewall of the workpiece, the adjustment operation for suppressing steps at four locations on the lower surface of the workpiece is simplified, and steps at all four locations can be fully suppressed. In other words, if the dressing device of feature 1 is used, the processing quality is improved compared to conventional dressing devices.

[0086] Furthermore, in the container manufacturing method of feature 5, the container is trimmed into a workpiece by using the trimming device described in any one of features 1 to 4, thereby enabling the manufacture of a container with high processing quality.

[0087] It should be noted that specific examples of the technology included in the patented technical solution are disclosed in this specification and the accompanying drawings, but the technology described in the patented technical solution is not limited to these specific examples. It also includes specific examples obtained by various modifications and alterations to the specific examples, as well as specific examples obtained by taking a part out of the specific examples separately.

Claims

1. A trimming device for cutting off the lower edge of a workpiece, the workpiece being a box-shaped structure with an open lower surface and a rectangular top view, and having a pair of short sidewalls located along a pair of short sides of the rectangle and a first and a second long sidewall located along a pair of long sides of the rectangle as sidewalls, wherein, The trimming device is provided separately: A short sidewall cutting machine that cuts off the lower edges of the pair of short sidewalls; A first long sidewall cutting machine cuts off the lower edge of the first long sidewall and the lower edges of a pair of corners between the first long sidewall and the pair of short sidewalls. as well as The second long sidewall cutting machine cuts off the lower edge of the second long sidewall and the lower edges of a pair of corners between the second long sidewall and the pair of short sidewalls. The short sidewall cutting machine, the first long sidewall cutting machine, and the second long sidewall cutting machine each include: The inner fitting member, which is rectangular in top view, fits into the inner side of the workpiece; A pressing member that presses the workpiece against the inner fitting member from above; and The inner and outer cutting edges are separately disposed on the inner and outer sides of the workpiece and slide relative to each other in the horizontal direction to cut off the lower edge of the workpiece. The inner fitting members of the first long sidewall cutting machine and the second long sidewall cutting machine are divided into a main block and an upper block that overlaps the main block, and each inner fitting member has a pair of spacers at two positions along the long side of the rectangle arranged in a top view and sandwiched between the lower surface of the upper block and the upper surface of the main block for height adjustment.

2. The trimming device according to claim 1, wherein, The trimming device includes a pair of grooves that pass through two positions along the short side of the lower surface of the upper block or the upper surface of the main block along the long side. The pair of spacers are rectangular parallelepipeds that fit perfectly into a pair of slots.

3. The trimming device according to claim 1, wherein, The inner fitting members of the short sidewall cutting machine, the first long sidewall cutting machine, and the second long sidewall cutting machine are divided into a main block and an upper block overlapping the main block, and each has a shaft portion hanging down from the upper block and a through hole formed in the main block for the shaft portion to pass through. The trimming device includes a lifting drive unit that is connected to the lower part of the shaft and raises and lowers the upper block together with the shaft to disengage the workpiece from the main block.

4. The trimming device according to claim 3, wherein, The shaft portions are paired and positioned at two locations near the two ends of the long side of the rectangle in the view of the upper block. The pair of spacers are respectively positioned at adjacent positions on the end side of the upper block in the long side direction, which is closer to the pair of shaft portions.

5. A method for manufacturing a container, comprising using the trimming device according to any one of claims 1 to 4 to manufacture a box-shaped container with one open side, wherein, The height difference between the pair of spacers of the first long sidewall cutter is adjusted in such a way that the step between the cut surfaces of the pair of short sidewalls formed by the short sidewall cutter and the cut surfaces of the pair of corners formed by the first long sidewall cutter is below a predetermined size, and After adjusting the height difference of the pair of spacers of the second long sidewall cutter to make the step between the cut surface of the pair of short sidewalls formed by the short sidewall cutter and the cut surface of the pair of corners formed by the second long sidewall cutter to a predetermined size, the lower edge of the workpiece is cut off as a whole by the trimming device to manufacture the container.

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