Trimming device

Abstract

(assignment) A technology for improving the processing quality of a trimming device is disclosed. (Means of solution) The trimming device (10) of the present disclosure comprises a side wall cutter (20) for cutting the lower edge portion of a pair of side walls (91) of a box-shaped work (90), a first side wall cutter (50A) for cutting the lower edge portion of a first side wall (92) and the lower edge portion of a pair of corner portions (90C) between the first side wall (92) and the pair of side walls (91), and a second side wall cutter (50B) for cutting the lower edge portion of a second side wall (92) and the lower edge portion of a pair of corner portions (90C) between the second side wall (92) and the pair of side walls (91). These side wall cutters (20, 50A, 50B) have an inner fitting member (40) that fits into the inner side of the work (90), and each inner fitting member (40) is divided into a main body block (33) and an upper block (42) that overlaps on the main body block (33), and also has a pair of height-adjusting spacers (45) that are fitted between the lower surface of the upper block (42) and the upper surface of the main body block (33).

Description

Technology Field

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

[0002] Conventional trimming devices of this type are equipped with a short-sided wall cutter and a long-sided wall cutter. The short-sided wall cutter cuts the lower edge portions of a pair of short-sided walls with a small width in the workpiece, and then the long-sided wall cutter cuts the lower edge portions of a pair of long-sided walls with a large width and the lower edge portions of the corner portions between the long-sided walls and the short-sided walls. Specifically, the short-sided wall cutter and the long-sided wall cutter together have an inner fitting member that fits into the inside of the workpiece, a pressing member that presses the workpiece against the inner fitting member from above, and a pair of slide blades facing each other from both sides on the lower edge portions of the workpiece. Then, while the workpiece is fitted into the inner fitting member, the pair of slide blades move back and forth horizontally, thereby cutting the opposing lower edge portions of the workpiece as described above. In addition, the inner fitting member is divided into a main body block and an upper block, and the vertical position of the upper block is position-controlled by a servo motor. And, through such position control, an adjustment was made to suppress the step difference between the part cut by the short-sided wall cutter and the part cut by the long-sided wall cutter on the lower surface of the workpiece (see, for example, Patent Document 1). Prior art literature

[0003] Japanese Patent Publication No. 2002-292438 (Fig. 1, paragraph

[0062] ) The problem to be solved

[0004] However, on the lower surface of the workpiece processed by the above-described trimming device, the above-described steps may occur at four locations. Specifically, a total of four steps may occur, consisting of steps formed at two locations near the long side wall of one of the pair of short side walls of the workpiece due to cutting by the slide blade of one long side wall cutter, and steps formed at two locations near the long side wall of the other of the pair of short side walls of the workpiece due to cutting by the slide blade of the other long side wall cutter. However, in the above-described conventional trimming device, it was not possible to sufficiently suppress all four of the above-described steps, which resulted in problems with processing quality.

[0005] The present invention has been made in consideration of the above circumstances and discloses a technology for improving the processing quality of a trimming device. means of solving the problem

[0006] A first aspect of the invention disclosed herein, made to achieve the above objective, is a trimming device for cutting the entire lower edge portion of a workpiece having a bottom surface open and a top surface forming a rectangular box shape, and having, as side walls, a pair of short side walls located on a pair of short sides of the rectangle and first and second long side walls located on a pair of long sides, wherein the device is separately equipped with a short side wall cutter for cutting the lower edge portion of the pair of short side walls, a first long side wall cutter for cutting the lower edge portion of the first long side wall and the lower edge portion of a pair of corner portions between the first long side wall and the pair of short side walls, and a second long side wall cutter for cutting the lower edge portion of the second long side wall and the lower edge portion of a pair of corner portions between the second long side wall and the pair of short side walls, wherein each of the short side wall cutter and the first and second long side wall cutters has a top surface forming a rectangular shape, and The trimming device is equipped with an inner fitting member that fits into the inner side of a workpiece, a pressing member that presses the workpiece against the inner fitting member from above, and an inner blade member and an outer blade member that are arranged separately on the inner and outer sides of the workpiece and slide relative to each other in a horizontal direction to cut the lower edge portion of the workpiece, wherein each of the inner fitting members of the first and second long side wall cutters is divided into a main body block and an upper block that overlaps on the main body block, and also has a pair of height-adjusting spacers arranged at two locations in the rectangular longitudinal direction on the upper surface of each inner fitting member and fitted between the lower surface of the upper block and the upper surface of the main body block. Brief explanation of the drawing

[0007] FIG. 1 is a perspective view of a workpiece according to one embodiment of the present invention. Figure 2 is a perspective view of a trimming device. FIG. 3 is a side cross-sectional view of a single-sided wall cutter seen from the first horizontal direction. Figure 4 is a perspective view of a single-sided wall cutter. FIG. 5 is a perspective view of the outer blade member seen from below. FIG. 6A is a side view of the upper block, FIG. 6B is a bottom view of the upper block of the short side wall cutter, and FIG. 6C is a bottom view of the upper block of the first long side wall cutter. FIG. 7 is a side cross-sectional view of a part of a single-sided wall cutter seen from the second horizontal direction. FIG. 8 is a side cross-sectional view of the first long side wall cutter seen from the first horizontal direction. FIG. 9 is a side cross-sectional view of the first long side wall cutter seen from the second horizontal direction. FIG. 10 is a side cross-sectional view of the first long side wall cutter seen from the second horizontal direction. Specific details for implementing the invention

[0008] Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 10. FIG. 1 (a) shows a work (90) being trimmed by a trimming device (10) of the present embodiment (see FIG. 2). The work (90) has an upper bottom and forms a rectangular shape with an open bottom surface, and has a rectangular cross-sectional shape, and has a pair of short side walls (91) located on the short side portion of the rectangle, a pair of long side walls (92) located on the long side portion, and an upper wall (93).

[0009] Additionally, the work (90) is manufactured by drawing and forming the sheet metal multiple times using a transfer press machine, for example, not shown. Because of this, the work (90) may have a curved shape (not shown) at the opening side cross-section of the short side wall (91) and the long side wall (92), or the height from the upper wall (93) to the opening side cross-section of the short side wall (91) and the long side wall (92) may be uneven. In response to this, in order to unify the work (90) to a predetermined height and to flatten the opening side cross-section of the short side wall (91) and the long side wall (92), the opening edge (lower edge portion) of the work (90) is trimmed by a trimming device (10) according to the present disclosure.

[0010] In addition, in the trimming device (10) of the present embodiment, a pair of long side walls (92) of a workpiece (90) are processed separately. Therefore, when describing a pair of long side walls (92) separately below, the left long side wall (92) of each workpiece (90) shown in FIG. 1 is referred to as the "first long side wall (92)" and the right long side wall (92) is referred to as the "second long side wall (92)".

[0011] As shown in FIG. 2, the trimming device (10) is equipped with a short wall cutter (20) for trimming a pair of short side walls (91) of a work (90), a first long side wall cutter (50A) for trimming a first long side wall (92), and a second long side wall cutter (50B) for trimming a second long side wall (92), arranged at equal intervals in a horizontal direction. Hereinafter, the arrangement direction of the short wall cutter (20), the first long side wall cutter (50A), and the second long side wall cutter (50B) is referred to as the "first horizontal direction H1," and the direction perpendicular to the first horizontal direction H1 is referred to as the "second horizontal direction H2." Also, if the short side wall cutter (20), the first long side wall cutter (50A), and the second long side wall cutter (50B) are not distinguished, they are simply referred to as “side wall cutters (20, 50A, 50B)”.

[0012] The trimming device (10) has, in addition to the side wall cutters (20, 50A, 50B), a transfer device (11) for conveying the work (90) in the order of the short side wall cutter (20), the first long side wall cutter (50A), and the second long side wall cutter (50B), and a pressing device including a pressing member (70) for pressing the work (90) toward each side wall cutter (20, 50A, 50B).

[0013] The transfer device (11) has a structure in which four pairs of clamping members (12) are attached to a pair of rail members (13) that face each other in the second horizontal direction H2 and extend to the first horizontal direction H1. In addition, each pair of clamping members (12) is fixed separately to the pair of rail members (13) and faces each other in the second horizontal direction H2, and has a groove (12A) that extends vertically on each other's opposing surfaces. In addition, in the first horizontal direction H1, the clamping members (12) are arranged at equal intervals, and the spacing between the clamping members (12) is the same as the spacing between the side wall cutters (20, 50A, 50B). Then, the rail members (13) reciprocate in the first horizontal direction H1 with a return stroke of the same length as the spacing between the clamping members (12), and the opening and closing operation of the rail members (13) to be folded together is repeated.

[0014] As shown in FIG. 2, the pressing member (70) of the pressing device is formed by fixing the lower end of a pair of shaft portions (28) extending in the vertical direction to a pressing block (27), and is positioned directly above the side wall cutters (20, 50A, 50B). In addition, the upper end of the shaft portion (28) is connected to a lifting drive unit using an air cylinder (not shown) as a driving source. Furthermore, the pressing block (27) of the pressing member (70) forms a strip plate shape extending, for example, in the second horizontal direction H2, and the planar shape of the pressing block (27) is slightly smaller than the planar shape of the work (90).

[0015] FIGS. 3 to 7 show in detail the structure of a single-sided wall cutter (20). As shown in FIG. 3, the single-sided wall cutter (20) is equipped with an inner fitting member (40) that is fitted into the inner side of a work (90), an outer fitting part (21) that is fitted into the outer side of a work (90), and an outer blade member (23) that has a receiving hole (23K) that accommodates the lower part of the inner fitting member (40) and supports the outer fitting part (21) from below.

[0016] As shown in FIG. 4, the outer fitting portion (21) has a pair of supporting columns (22) that are opposite in the second horizontal direction H2 and extend in the vertical direction, and the supporting columns (22) are attached in an overlapping state on the upper surface of the outer edge member (23) as shown in FIG. 3. Also, as shown in FIG. 4, a groove (22A) extending in the vertical direction is formed on the mutually opposite surfaces of the two supporting columns (22). The inner surface of the upper part of each groove (22A) is inclined so that it gradually widens in both directions of the second horizontal direction H2 and the first horizontal direction H1 as it faces upward.

[0017] As shown in FIG. 4, at both ends of the first horizontal direction H1 on the lower surface of the outer blade member (23), a pair of beams (23J) extending in the second horizontal direction H2 (only one beam (23J) is shown in FIG. 4) are provided, and the pair of beams (23J) are fixed in a state where they are in contact with the upper surface of the support block (29).

[0018] As shown in FIG. 5, on the two sides of the lower surface of the outer blade member (23) where the receiving hole (23K) is inserted in the second horizontal direction H2, a pair of opposing protruding walls (23T) (only one pair of opposing protruding walls (23T) is shown in FIG. 5) are installed. The opposing protruding walls (23T) extend in the second horizontal direction H2 and are also at the same height as the beam (23J) and are in contact with the upper surface of the support block (29).

[0019] The spacing between the opposing surfaces in the first horizontal direction H1 of these pair of opposing protruding walls (23T) is slightly smaller than the spacing between the pair of long side walls (92) of the work (90). Also, a horizontal edge formed by the intersection of the portion located at both ends of the second horizontal direction H2 of the inner surface of the receiving hole (23K) and the lower surface of the outer edge member (23) forms the first outer edge (25A). In addition, the edge portions of the opposing protruding walls (23T) extending downward from both sides of the first outer edge (25A) form a pair of second outer edges (25B), and the outer edge (25) is formed by the first outer edge (25A) and the second outer edge (25B).

[0020] A guide member (23G) (see FIG. 3) is attached between the opposing protruding walls (23T) in the first horizontal direction H1. As shown in FIG. 4, the guide member (23G) has an inclined surface at one end on the side of the receiving hole (23K) in the prismatic body extending in the second horizontal direction H2 between the opposing protruding walls (23T), and is positioned at a location away from the receiving hole (23K). Furthermore, the side of the receiving hole (23K) rather than the inclined surface of each guide member (23G) becomes a discharge path (23B) for discharging scrap separated from the work (90) by the outer blade (25) and the inner blade (35) described later. Additionally, a discharge groove (29B) is formed below each discharge path (23B) in the support block (29) to discharge the scrap downwards from the support block (29).

[0021] As shown in FIG. 4, between a pair of supporting members (23J) (only one supporting member (23J) is shown in FIG. 4), an inner blade member (32) and a pair of auxiliary sliders (31) (only one auxiliary slider (31) is shown in FIG. 4) are accommodated.

[0022] The inner blade member (32) is sized to fit precisely into the inner lower portion of the work (90) and is also sized to fit precisely between the lower surface of the outer blade member (23) and the upper surface of the support block (29). In addition, inner blades (35) are provided at both ends of the second horizontal direction H2 of the inner blade member (32). Specifically, as shown in FIG. 5, a horizontal edge portion formed by the intersection of the upper surface of the inner blade member (32) and the cross-section of the second horizontal direction H2 forms the first inner blade (35A), and an edge portion extending vertically from both sides of the first inner blade (35A) forms a pair of second inner blades (35B), and the inner blade (35) is composed of the first inner blade (35A) and the second inner blade (35B).

[0023] A pair of auxiliary sliders (31) are slightly smaller than the inner blade member (32) in the second horizontal direction H2. The auxiliary sliders (31) are fixed to both sides of the inner blade member (32), and both ends of the inner blade member (32) in the second horizontal direction H2 protrude slightly forward and backward from the auxiliary sliders (31).

[0024] In addition, the edge portion along the inner blade member (32) on the upper surface of the auxiliary slider (31) is recessed in a stepped shape so that the work (90) fitted into the inner blade member (32) does not interfere with the auxiliary slider (31). Furthermore, the movable unit (32K) consisting of these inner blade members (32) and a pair of auxiliary sliders (31) is regulated to move in the first horizontal direction H1 by a pair of supporting members (23J), and its vertical movement is regulated by the lower surface of the outer blade member (23) and the upper surface of the support block (29), so that it can slide only in the second horizontal direction H2. In addition, the movable unit (32K) is configured to receive power from an unillustrated driving source (servo motor, air actuator, etc.) through an unillustrated shaft connected to one end surface of the second horizontal direction H2 in the auxiliary slider (31), for example.

[0025] As shown in FIG. 4, the inner fitting member (40) is divided into a main body block (33) and an upper block (42). The main body block (33) has a flat block shape that can be fitted into the work (90), and its planar shape is slightly smaller in the second horizontal direction H2 and the same in the first horizontal direction H1 compared to the planar shape of the inner blade member (32). Also, as shown in FIG. 3, a pair of through holes (33A) are vertically penetrating at positions near both ends of the second horizontal direction H2 in the main body block (33) and the inner blade member (32), and a through hole (29C) with an inner diameter larger than the through hole (33A) is vertically penetrating on the extension line of the through hole (33A) in the support block (29). And, a pair of shaft sections (34) are inserted and passed through a pair of through holes (29C, 33A), and the lower ends of the pair of shaft sections (34) are connected to the output of a lifting drive unit not shown.

[0026] The lifting drive unit uses, for example, a servo motor as a driving source and is equipped with a power conversion mechanism that receives the rotational output of the servo motor at the input unit and converts it into a linear movement motion at the output unit. Examples of such power conversion mechanisms include a rack and pinion, a ball screw mechanism, a crank mechanism, and a cam mechanism. In addition, the output unit of the power conversion mechanism is arranged to move linearly in the up and down direction, and the lower ends of a pair of shaft units (34) are connected to the output unit.

[0027] 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 the main body block (33) and has a flat cross-sectional shape approximately identical to that of the main body block (33). Also, as shown in FIG. 6A, a pair of through holes (43) are formed near both ends of the second horizontal direction H2 in the upper block (42). The through holes (43) are equipped with recessed portions (43B, 43C) at both ends, and the upper end of the shaft portion (34) is fitted into the lower recessed portion (43B). Additionally, a female screw hole (34N) is formed at the center of the upper end of the shaft portion (34). And, the bolt (B1) passed through the through hole (43) from above is screwed into the female screw hole (34N), and the head of the bolt (B1) is received in the recessed portion (43C) so as not to protrude from the upper surface of the upper block (42).

[0028] At two locations on the lower surface of the upper block (42) that are closer to the end than a pair of through holes (43) in the longitudinal direction (second horizontal direction H2), a pair of grooves (42M) that penetrate the upper block (42) in the width direction (first horizontal direction H1) are formed, and a pair of female screw holes (42E) that open on the bottom surface of the pair of grooves (42M) are provided. A pair of spacers (45) are fitted into the pair of grooves (42M). The spacers (45) form a rectangular shape extending in the width direction (first horizontal direction H1) of the upper block (42), and the total length of the spacers (45) is slightly smaller than the width (width) of the upper block (42). Additionally, a through hole (46) having a recessed portion (46B) is formed in the center of the longitudinal direction of the spacer (45). Then, a bolt (B2) passed through the through hole (46) is fastened to the female screw hole (42E), and the head of the bolt (B2) is received in the recessed portion (46B) so as not to protrude from the lower surface of the spacer (45).

[0029] As shown in FIG. 6A, a plurality of upper surface grooves (42F) are formed on the upper surface of the upper block (42) by slightly indenting multiple locations along the length direction. The plurality of upper surface grooves (42F) extend across the entire width direction (first horizontal direction H1) of the upper block (42).

[0030] In addition, the first and second long-sided wall cutters (50A, 50B) described later are each equipped with an upper block (42). Furthermore, in the upper block (42) of the short-sided wall cutter (20), as shown in FIG. 6B, the aforementioned pair of through holes (43) are positioned in the center of the width direction (first horizontal direction H1) of the upper block (42), whereas in the upper block (42) of the first and second long-sided wall cutters (50A, 50B), as shown in FIG. 6C, the pair of through holes (43) are positioned slightly offset to one side from the center of the width direction (first horizontal direction H1) of the upper block (42).

[0031] The description of the configuration of the single-sided wall cutter (20) is as follows. Next, the operation of the transfer device (11) and the single-sided wall cutter (20) will be described.

[0032] The workpiece (90) is transported by the transfer device (11) as follows. First, a pair of rail members (13) are placed at one end of the transport stroke (hereinafter referred to as the "starting end" and the opposite as the "ending end") while in an open state. In this state, the workpiece (90) is supplied from the transfer press between the pair of clamping members (12) on the starting end side. Then, the rail members (13) are closed, and the workpiece (90) is clamped while entering the grooves (12A) of the pair of clamping members (12) on the starting end side, and the rail members (13) move to the ending end side of the transport stroke. By doing so, the workpiece (90) moves directly over the outer fitting part (21) of the end-side wall cutter (20). In this state, the upper block (42) of the single-sided wall cutter (20) rises, and the work (90) is clamped from the upper and lower directions by the upper block (42) and the pressing member (70). Then, the rail member (13) opens, and the pressing member (70) and the upper block (42) descend together with the work (90), and as described below, the work (90) is set on the single-sided wall cutter (20), and during this time, the rail member (13) moves to the beginning of the return stroke and waits. Then, when the processing of the work (90) by the single-sided wall cutter (20) is finished, the pressing member (70) and the upper block (42) rise together with the work (90), and the work (90) is placed between a pair of clamping members (12) waiting above. At this time, a work (90) from a transfer press is supplied between a pair of clamping members (12) on the end side. Below, by repeating the same operation, the work (90) is intermittently conveyed from the transfer press to a short-sided wall cutter (20), a first long-sided wall cutter (50A) and a second long-sided wall cutter (50B), and a work discharge section not shown.

[0033] The single-sided wall cutter (20) operates as follows. That is, when a workpiece (90) that has not been processed by the single-sided wall cutter (20) is clamped between the upper block (42) and the pressing member (70) of the single-sided wall cutter (20) and lowered, the workpiece (90) is fitted between the outer fitting part (21) and the inner fitting member (40). Then, as shown in FIG. 3, the lowering of the upper block (42) and the pressing member (70) stops at the point where a pair of spacers (45) on the lower surface of the upper block (42) come into contact with the main body block (33) of the inner fitting member (40), and the workpiece (90) is maintained in a state where it receives a pressing force from the pressing member (70). By this, the setting of the above-mentioned workpiece (90) to the single-sided wall cutter (20) is completed. At this time, at the lower end of the work (90), as shown in FIG. 7, the lower edge portion of the side wall (91) is positioned between the outer blade (25) and the inner blade (35). In this state, the inner blade member (32) moves back and forth in the second horizontal direction H2. By doing so, as shown in FIG. 1 (b), the lower edge portion of the side wall (91) of the work (90) is horizontally cut to form a first cut surface (95), and at the same time, a pair of vertical cut surfaces (96) extending downward from both ends of the first cut surface (95) are formed, and the end of the side wall (91) is cut into a square. Then, the work (90) is in a state having a pair of lower pieces (94).

[0034] When the above-described cutting process is completed, the upper block (42) and the pressing member (70) rise as described above, and the work (90) is transferred to the transfer device (11).

[0035] In addition, the inner fitting member (40) of the short-sided wall cutter (20) moves in a second horizontal direction H2 with respect to the work (90) together with the inner blade member (32). As shown in FIG. 4, a plurality of upper surface grooves (42F) are formed on the upper surface of the inner fitting member (40), so that the contact area with the work (90) is small and it is easy to slide, thereby suppressing the slide resistance between the inner fitting member (40) and the work (90). The same applies to the inner fitting member (40) of the first and second long-sided wall cutters (50A, 50B) described later.

[0036] The description of the configuration and operation of the short-sided wall cutter (20) is as follows. Next, with reference to FIGS. 8 to 10, only the configuration of the first long-sided wall cutter (50A) that is different from the short-sided wall cutter (20) will be described, and the same reference numerals will be used for the configuration identical to the short-sided wall cutter (20), and redundant descriptions will be omitted.

[0037] As shown in FIG. 8, in the first long side wall cutter (50A), a pair of supporting members (23J) of the outer blade member (23) are arranged facing each other in the second horizontal direction H2. In addition, the inner blade member (54) of the first long side wall cutter (50A) is fitted into the pair of supporting members (23J) in the second horizontal direction H2, and is fitted from the upper and lower directions to the lower surface of the outer blade member (23) and the upper surface of the support block (29), and is supported so as to be slidable only in the first horizontal direction H1. Furthermore, the inner blade member (54) receives power to move in the first horizontal direction H1 from an unillustrated driving source through an unillustrated shaft connected to one end surface of the first horizontal direction H1.

[0038] As shown in FIG. 9, the inner blade member (54) is provided with a pair of side wall receiving grooves (54A) that penetrate vertically. The pair of side wall receiving grooves (54A) extend in a second horizontal direction H2, and the part of the inner blade member (54) that is fitted into the pair of side wall receiving grooves (54A) becomes the core part (54H).

[0039] Also, the inner fitting member (40) of the first long side wall cutter (50A) is made slightly smaller than the core part (54H) in the first horizontal direction H1. And, the main body block (33) of the inner fitting member (40) is fixed to the core part (54H) in such a state that, for example, one side of the first horizontal direction H1 is roughly the same plane as one side of the core part (54H). Also, the edge portion formed by the intersection of the other side of the core part (54H) and the upper surface becomes the inner blade (55). In addition, corresponding to this inner blade (55), the part of the edge portion formed by the intersection of the lower surface of the outer blade member (23) and the inner surface of the receiving hole (23K) that is parallel to and opposite to the inner blade (55) becomes the outer blade (52). Additionally, a discharge groove (29B) is formed below the side wall receiving groove (54A) on one side where the outer blade (52) and the inner blade (55) of the support block (29) face.

[0040] In addition, as described above, the main body block (33) is positioned close to one side of the first horizontal direction H1 with respect to the core part (54H), so the through hole (33A) for the shaft part (34) is positioned close to the other side of the first horizontal direction H1 in the main body block (33). Correspondingly, as described above, the through hole (43) in the upper block (42) is also positioned close to the other side of the first horizontal direction H1 as described above (see FIG. 6C).

[0041] The description of the configuration of the first long side wall cutter (50A) is as follows. The second long side wall cutter (50B) is formed by rotating the first long side wall cutter (50A) 180 degrees, and the structure of one side of the first horizontal direction H1 in the second long side wall cutter (50B) is identical to the structure of the other side of the first horizontal direction H1 in the first long side wall cutter (50A), and the structure of the other side of the first horizontal direction H1 in the second long side wall cutter (50B) is identical to the structure of one side of the first horizontal direction H1 in the first long side wall cutter (50A).

[0042] Next, the operation of the first long side wall cutter (50A) and the second long side wall cutter (50B) will be explained. As described above, the work (90), which has finished trimming the short side wall (91) with the short side wall cutter (20), is returned to the first long side wall cutter (50A) by the transfer device (11), and is set in the first long side wall cutter (50A) in the same way as in the case of the short side wall cutter (20). Then, a pair of lower pieces (94) (see FIG. 1) of the work (90) enter the pair of side wall receiving grooves (54A) of the inner blade member (54) as shown in FIG. 10, and a position near the bottom of one long side wall (92) is positioned between the inner blade (55) and the outer blade (52).

[0043] In this state, the inner blade member (54) moves toward the outer blade (52) and then returns to its original position. As a result, only one of the pair of lower pieces (94) of the work (90) is cut off, as shown in (c) of FIG. 1. Specifically, the lower edge portion of the first long side wall (92) of the work (90) and the lower edge portion of the pair of corner portions (90C) between the first long side wall (92) and the pair of short side walls (91) are cut off by the first long side wall cutter (50A) to form a second cut surface (97A).

[0044] The work (90), which has been cut by the first long side wall cutter (50A), is returned by the transfer device (11) and set in the second long side wall cutter (50B). Then, the second long side wall cutter (50B) performs a cutting process in the same way as the first long side wall cutter (50A), and the remaining lower piece (94) of the work (90) is cut off as shown in (d) of FIG. 1. Specifically, the lower edge portion of the second long side wall (92) of the work (90) and the lower edge portion of the pair of corner portions (90C) between the second long side wall (92) and the pair of short side walls (91) are cut off by the first long side wall cutter (50A) to form a third cut surface (97B). Then, the work (90), which has been cut by the second long side wall cutter (50B), is returned to the work discharge section by the transfer device (11).

[0045] The description of the configuration and operation of the trimming device (10) of the present embodiment is as follows. Next, a method for manufacturing a container using the trimming device (10) of the present embodiment will be described.

[0046] As an unfinished container, a plurality of workpieces (90) are supplied from a transfer press to a trimming device (10). Then, the plurality of workpieces (90) are used, and the adjustment of each of the short side wall cutter (20), the first long side wall cutter (50A), and the second long side wall cutter (50B) is performed sequentially.

[0047] The adjustment of the single-sided wall cutter (20) is as follows. That is, a work (90) supplied from a transfer press is processed by the single-sided wall cutter (20), and as shown in Fig. 1 (b), a pair of first cutting surfaces (95) are added to the work (90). Then, the height of each from the pair of first cutting surfaces (95) of the work (90) to the upper surface of the work (90) is measured, and the height of the pair of spacers (45) of the single-sided wall cutter (20) is adjusted so that the difference between the measured value of each height (hereinafter referred to as "a pair of height measurements") and a predetermined height specification value falls within a predetermined allowable dimension range.

[0048] Specifically, the initial height of a pair of spacers (45) is set so that the height measurement of the pair exceeds the allowable dimension range of the height specification value. Then, depending on the difference between the height measurement of the pair and the height specification value, the lower or upper surface of the pair of spacers (45) of the single-sided wall cutter (20) is ground or cut. The grinding of each spacer (45) may be performed while the pair of spacers (45) are attached to the upper block (42), or it may be performed while the pair of spacers (45) are separated from the upper block (42). Also, when the grinding of each spacer (45) is performed while the pair of spacers (45) are attached to the upper block (42), the upper block (42) may be fixed to the shaft portion (34), or the upper block (42) may be detached from the shaft portion (34).

[0049] Then, the workpiece (90) is processed by the single-sided wall cutter (20) after the grinding of the spacer (45) is finished, and a pair of height measurement values ​​and a specified height are checked to see if they match within the allowable dimension range. If they do not match, the above operation is repeated, and if they match, the adjustment of the single-sided wall cutter (20) is completed. In addition, if the spacer (45) is ground more than necessary during the above adjustment, it can be replaced with a new spacer (45) and the grinding, etc., can be performed.

[0050] The adjustment of the first long side wall cutter (50A) is as follows. That is, the workpiece (90) processed by the short side wall cutter (20) that has completed the adjustment is processed by the first long side wall cutter (50A), and a second cutting surface (97A) is added to the workpiece (90) as shown in (c) of FIG. 1. Then, the height of the step difference between the second cutting surface (97A) of the workpiece (90) and a pair of first cutting surfaces (95) is measured, and the height of a pair of spacers (45) of the first long side wall cutter (50A) is adjusted so that the measured value of each step difference (hereinafter referred to as "a pair of step difference measured values") is less than or equal to a predetermined specified dimension (e.g., 0.05 mm). Specifically, the initial height of the pair of spacers (45) is such that the measured value of the pair of step differences exceeds the specified dimension. And, depending on the size of the pair of step measurements, the pair of spacers (45) of the first long side wall cutter (50A) are ground, just as in the case of the short side wall cutter (20). Here, if the pair of step measurements are of the same size, the pair of spacers (45) of the first long side wall cutter (50A) are ground by the same amount so that the pair of step measurements are less than or equal to the specified dimension. Also, if the pair of step measurements are of different sizes, the pair of spacers (45) are ground by different amounts according to each step measurement so that the pair of step measurements are less than or equal to the specified dimension. Then, the workpiece (90) is processed by the first long side wall cutter (50A) after the grinding of the spacer (45) is finished, and a pair of step measurement values ​​are checked to see if they are below the specified dimension. If they are not below the specified dimension, the above operation is repeated, and if they are below the specified dimension, the adjustment of the first long side wall cutter (50A) is completed.

[0051] The adjustment of the second long side wall cutter (50B) is as follows. That is, the work (90) processed by the first long side wall cutter (50A) that has been adjusted is processed by the second long side wall cutter (50B), and a third cutting surface (97B) is added to the work (90) as shown in (d) of FIG. 1. Then, the height of the step difference between the third cutting surface (97B) of the work (90) and a pair of first cutting surfaces (95) is measured, and the height of a pair of spacers (45) of the second long side wall cutter (50B) is adjusted as follows, just as in the case of the first long side wall cutter (50A).

[0052] As described above, when the adjustment of the side wall cutters (20, 50A, 50B) is completed, the trimming device (10) is operated continuously, and a work (90) with the lower edge portion trimmed is manufactured as a container.

[0053] As described above, according to the trimming device (10) of the present embodiment, by dividing the long side wall cutter, which was previously one, into first and second long side wall cutters (50A, 50B), the adjustment work to suppress the step difference at four locations on the lower surface of the workpiece (90) is simplified, and it becomes possible to sufficiently suppress all four step differences. That is, the trimming device (10) of the present embodiment has improved processing quality compared to the conventional one.

[0054] [Other embodiments]

[0055] In the above embodiment, the side wall cutter (20, 50A, 50B) was adjusted by grinding a pair of spacers (45), but multiple types of spacers (45) with different heights may be prepared in advance, and the adjustment may be performed by exchanging the spacers (45).

[0056] In the above embodiment, a pair of spacers (45) were fixed to the upper block (42) side, but they may also be fixed to the main body block (33) side.

[0057] In the above embodiment, each spacer (45) formed a rectangular shape, but it is not limited to this, and for example, it may be a cylindrical body with a central axis parallel to the vertical direction, or a structure made of stacked thin plates.

[0058] In the above embodiment, each upper block (42) was equipped with a pair of spacers (45), but the pair of spacers (45) may each be divided into two in the width direction (first horizontal direction H1) of the upper block (42) and may have a structure with four spacers (45). With such a structure, more fine adjustments can be made.

[0059] In the above embodiment, each of the first and second long side wall cutters (50A, 50B) has an asymmetrical structure in the first horizontal direction H1, and for example, only has one discharge groove (29B) (see FIG. 9) and can only cut one lower piece (94), but the first and second long side wall cutters (50A, 50B) may have a symmetrical structure in the first horizontal direction H1 and can cut a pair of lower pieces (94), but may be configured to cut only one lower piece (94) each.

[0060] Bookkeeping

[0061] Hereinafter, the feature group extracted from the above embodiment will be explained while indicating effects, etc., as necessary. In addition, for ease of understanding, the symbols of corresponding specific configurations in the above embodiment are appropriately indicated in parentheses, etc., but these feature groups are not limited to the specific configurations indicated in parentheses, etc.

[0062] [Feature 1]

[0063] A trimming device (10) for cutting the entire lower edge portion of a workpiece (90) having an open bottom surface and a planar shape forming a rectangular box, and having a pair of short side walls (91) located on a pair of short sides of the rectangle as side walls, and first and second long side walls (92) located on a pair of long sides, comprising a short side wall cutter (20) for cutting the lower edge portion of the pair of short side walls (91), a first long side wall cutter (50A) for cutting the lower edge portion of the first long side wall (92) and the lower edge portion of a pair of corner portions (90C) between the first long side wall (92) and the pair of short side walls (91), and a lower edge portion of the second long side wall (92) and a pair of corner portions (90C) between the second long side wall (92) and the pair of short side walls (91). A second long-sided wall cutter (50B) for cutting the lower edge portion of the corner portion (90C) is separately provided, and each of the short-sided wall cutter (20) and the first and second long-sided wall cutters (50A, 50B) is provided with an inner fitting member (40) having a rectangular planar shape that fits into the inner side of the work (90), a pressing member (70) that presses the work (90) against the inner fitting member (40) from above, and an inner blade member (32, 54) and an outer blade member (23) that are arranged separately on the inner and outer sides of the work (90) and slide relatively in the horizontal direction to cut the lower edge portion of the work (90), and each of the inner fitting member (40) of the first and second long-sided wall cutters (50A, 50B) is provided with a main body block (33) and the main body A trimming device (10) having a pair of height-adjusting spacers (45) that are placed at two locations along the longitudinal direction of the rectangular shape of the planar shape, and inserted between the lower surface of the upper block (42) and the upper surface of the main body block (33), in addition to being divided into two parts by an upper block (42) that overlaps on the block (33).

[0064] [Feature 2]

[0065] A trimming device (10) described in Feature 1, having a pair of grooves (42M) that penetrate in the width direction at two locations along the length direction of the lower surface of the upper block (42) or the upper surface of the main body block (33), and the pair of spacers (45) having a rectangular shape that fits precisely into the pair of grooves (42M).

[0066] [Feature 3]

[0067] The trimming device (10) described in feature 1 or 2, wherein each of the inner fitting members (40) of the above-mentioned short-sided wall cutter (20) and the above-mentioned first and second long-sided wall cutters (50A, 50B) is divided into a main body block (33) and an upper block (42) that overlaps on the main body block (33), and has a shaft portion (34) that is lowered from the upper block (42) and a through hole (33A) formed in the main body block (33) through which the shaft portion (34) passes, and has a lifting drive unit connected to the lower part of the shaft portion (34) and lifting the upper block (42) together with the shaft portion (34) to detach the work (90) from the main body block (33).

[0068] [Feature 4]

[0069] The above shaft portion (34) is arranged in pairs at two locations near both ends of the rectangular longitudinal direction of the planar shape of the upper block (42), and the pair of spacers (45) are each arranged next to the upper block (42) at the end side of the longitudinal direction relative to the pair of shaft portions (34), in a trimming device (10) described in feature 3.

[0070] [Feature 5]

[0071] A manufacturing method for producing a box-shaped container with one side open using a trimming device (10) described in any one of features 1 to 4, wherein the height difference of the pair of spacers (45) of the first long-sided wall cutter (50A) is adjusted so that the height difference between the cut surface (95) of the pair of short-sided walls (91) by the short-sided wall cutter (20) and the cut surface (97A) of the pair of corner sections (90C) by the first long-sided wall cutter (50A) is less than or equal to a preset specified dimension, and the height difference between the cut surface (95) of the pair of short-sided walls (91) by the short-sided wall cutter (20) and the cut surface (97B) of the pair of corner sections (90C) by the second long-sided wall cutter (50B) is less than or equal to a preset specified dimension. A method for manufacturing a container by adjusting the height difference of the pair of spacers (45) of the long side wall cutter (50B) and then cutting the entire lower edge portion of the work (90) by the trimming device (10).

[0072] In the trimming device of features 1 to 4, the long side wall cutter, which was conventionally a single unit, is divided into a first long side wall cutter that cuts the lower edge portion of the first long side wall of the workpiece and the lower edge portion of the pair of corner portions between the first long side wall and the pair of short side walls, and a second long side wall cutter that cuts the lower edge portion of the second long side wall of the workpiece and the lower edge portion of the pair of corner portions between the second long side wall and the pair of short side walls. Additionally, 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 side wall cutters. By doing so, adjustments to suppress the step difference at two locations near the first long side wall that may occur due to the cutting process of the first long side wall cutter on the lower surface of the pair of short side walls of the workpiece can be performed by adjusting the height of the pair of spacers of the first long side wall cutter. Here, if the step difference at the two locations is of the same height, the step difference at the two locations can be suppressed by lowering or raising the pair of spacers of the first long side wall cutter by the same amount. Also, if the step difference at the two locations is of different heights, the step difference at the two locations can be suppressed by lowering or raising the pair of spacers by different sizes according to the difference in the step difference at the two locations. Likewise, adjustments to suppress the step difference at the two locations near the second long side wall among the lower surfaces of the pair of short side walls of the workpiece can be performed by adjusting the height of the pair of spacers of the second long side wall cutter. As such, according to the trimming device of features 1 to 4, the long side wall cutter, which was conventionally a single unit, is divided into a first long side wall cutter for the first long side wall of the workpiece and a second long side wall cutter for the second long side wall of the workpiece, thereby simplifying the adjustment work to suppress step differences at four locations on the lower surface of the workpiece, and making it possible to sufficiently suppress all four step differences. In other words, using the trimming device of feature 1 improves processing quality compared to the conventional one.

[0073] In addition, in the method for manufacturing a container of feature 5, by using a trimming device described in any one of features 1 to 4 to trim the container as a workpiece, it becomes possible to manufacture a container with high processing quality.

[0074] In addition, the present specification and drawings disclose specific embodiments of the technology included in the claims. However, the technology described in the claims is not limited to these specific embodiments and includes various modifications and alterations of the embodiments, as well as parts derived independently from the embodiments. Explanation of the symbols

[0075] 10… trimming device 20… sidewall cutter 23… outer edge member 32, 54… inner edge member 33… Main body block 34… Shaft section 40… inner fit member 42… upper block 42M… each home 45… Spacer 50A… 1st long sidewall cutter 50B… 2nd long sidewall cutter 70… Absence of pressure 90… Work 91… single side wall 92… Long side wall 95, 97A, 97B… cross-section

Claims

Claim 1 A trimming device for cutting the entire lower edge portion of a workpiece having an open bottom surface and a rectangular box shape when viewed from the top surface, and having, as side walls, a pair of short side walls located on a pair of short sides of the rectangle and first and second long side walls located on a pair of long sides, wherein the device is separately equipped with a short side wall cutter for cutting the lower edge portion of the pair of short side walls, a first long side wall cutter for cutting the lower edge portion of the first long side wall and the lower edge portion of a pair of corner portions between the first long side wall and the pair of short side walls, and a second long side wall cutter for cutting the lower edge portion of the second long side wall and the lower edge portion of a pair of corner portions between the second long side wall and the pair of short side walls, and wherein each of the short side wall cutter and the first and second long side wall cutters has an inner fit that is rectangular when viewed from the top surface and fits into the inside of the workpiece. A trimming device comprising a member, a pressing member that presses the workpiece against the inner fitting member from above, and an inner blade member and an outer blade member that are arranged separately on the inner and outer sides of the workpiece and slide relative to each other in a horizontal direction to cut the lower edge portion of the workpiece, wherein each of the inner fitting members of the first and second long side wall cutters is divided into a main body block and an upper block that overlaps on the main body block, and also comprises a pair of height-adjusting spacers arranged at two locations along the rectangular length direction on the upper surface of each inner fitting member and fitted between the lower surface of the upper block and the upper surface of the main body block. Claim 2 A trimming device according to claim 1, having a pair of grooves penetrating in the width direction at two locations along the length direction of the lower surface of the upper block or the upper surface of the main body block, wherein the pair of spacers are rectangular in shape and fit precisely into the pair of grooves. Claim 3 A trimming device according to claim 1, wherein each of the inner fitting members of the short-sided wall cutter and the first and second long-sided wall cutters is divided into a main body block and an upper block overlapping the main body block, and has a shaft portion that is lowered from the upper block and a through hole formed in the main body block through which the shaft portion passes, and a lifting drive unit connected to the lower part of the shaft portion to lift the upper block together with the shaft portion to detach the workpiece from the main body block. Claim 4 A trimming device according to paragraph 3, wherein the shaft portions are arranged in pairs at two locations near both ends of the rectangular longitudinal direction on the upper surface of the upper block, and the pair of spacers are each arranged next to the pair of shaft portions, which are on the longitudinal end side of the upper block. Claim 5 A method for manufacturing a box-shaped container with one side open using a trimming device described in any one of claims 1 to 4, wherein the height difference of the pair of spacers of the first long-sided wall cutter is adjusted so that the height difference between the cut surface of the pair of short-sided walls by the short-sided wall cutter and the cut surface of the pair of corner portions by the first long-sided wall cutter is less than or equal to a preset specified dimension, and the height difference of the pair of spacers of the second long-sided wall cutter is adjusted so that the height difference between the cut surface of the pair of short-sided walls by the short-sided wall cutter and the cut surface of the pair of corner portions by the second long-sided wall cutter is less than or equal to a preset specified dimension, and then the entire lower edge portion of the workpiece is cut by the trimming device to manufacture the container.

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