Adjustment device

Abstract

To provide an adjustment device capable of correcting misalignment of a sheet having flaps with different lengths.SOLUTION: There is provided an adjustment device for adjusting a shape of a cardboard sheet. The sheet comprises: a body portion consisting of two side panels and two end panels connected alternately in a left-right direction; a glue tab portion connected to one end of the body portion in the left-right direction; an outer flap connected to a front and rear of the side panel; and an inner flap connected to the front and rear of the end panels, and is configured in that: the inner flap has a longer front-to-rear length than the outer flap at least in one of the front and rear, the side panels and end panels at the ends in the left and right direction are folded toward the center in the left and right direction, and the glue tab portion is bonded to the other end of the body portion in the left-right direction. The adjustment device has two adjustment units located at the front and rear and an auxiliary jig. At least one of the adjustment units is movable in the front-rear direction and holds the sheet from the front and rear, and the auxiliary jig is attached to the adjustment unit on a side where the outer flap and the inner flap have different front-to-back lengths, and contacts the outer flap when the adjustment unit pinches the sheet from the front and back.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a correcting device for correcting the shape of a corrugated sheet folded to form a box.

Background Art

[0002] Conventionally, a cardboard box manufacturing apparatus (box manufacturing apparatus) as shown in Patent Document 1 has been known. This apparatus has a folding part that folds a single cardboard sheet and adheres the ends to form a cylinder, and a hopper part that stacks the folded sheets. When folding the sheet in the folding part, due to various reasons, it may not be folded along the correct fold line, and the sheet may deviate from the correct position and orientation. Therefore, in the hopper part, the sheet is sandwiched between a front baffle plate in front of the sheet conveyance direction and an alignment plate behind it to correct the deviation (paragraph 0007, FIGS. 5 and 6 of Patent Document 1).

[0003] The correction of this sheet will be described in more detail. As shown in Fig. 8(a), the sheet 150 targeted by the above device consists of a body portion 151 composed of four panels 152 connected alternately in the left - right direction, a pasting margin portion 154 connected to one end of the body portion 151 in the left - right direction, and flaps 155 connected to the front and rear of each panel 152. The front - rear lengths of all the flaps 155 are equal. Then, the panels 152 at both ends are folded toward the center side, and the pasting margin portion 154 is adhered to the other end of the body portion 151 in the left - right direction. When folding, as shown in Fig. 8(b), the sheet 150 may be folded along a fold line inclined with respect to the correct fold line, and the lower - side panels 152 and flaps 155 folded with respect to the upper - side panels 152 and flaps 155 (the central - side panels 152 and flaps 155 before folding) may be displaced front - rear. Therefore, as shown in Fig. 8(c), before the adhesive applied to the pasting margin portion 154 is completely cured, the sheet 150 is sandwiched from the front and rear by two correction portions 451 (the front plate and the angle - adjusting plate in Patent Document 1). Since the front - rear lengths of all the flaps 155 of this sheet 150 are equal, the correction portions 451 contact all the flaps 155, and the displaced lower - side panels 152 and flaps 155 are aligned with the upper - side panels 152 and flaps 155, and the displacement is corrected.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, the cardboard box formed by the sheet 150 shown in Fig. 8(a) has the most common shape. On the other hand, as shown in Fig. 9(a), in at least one of the front and rear of the sheet 100, there are cases where the front and rear lengths of each flap are alternately different on the left and right (in the example shown here, the lengths of the rear flaps are different). The short flap is the rear outer flap 105b, and the long flap is the rear inner flap 106b. In addition to the rear outer flap 105b, the rear inner flap 106b also abuts (the tips of the opposing flaps touch when the opposing flaps are closed). Even in such a sheet 100, as shown in Fig. 9(b), displacement may occur during folding. However, even if an attempt is made to correct this with a conventional device, as shown in Fig. 9(c), the correcting portion 451 abuts on the rear inner flap 106b but does not abut on the rear outer flap 105b, so the displacement could not be corrected.

[0006] The present invention has been made in view of such circumstances, and has a correcting portion that sandwiches the folded sheet from the front and rear, and aims to provide a correcting device that can correct the displacement of a sheet in which the lengths of the flaps are different.

Means for Solving the Problems

[0007] The correcting device of the present invention is a correcting device for correcting the shape of a cardboard sheet folded to form a box. The sheet includes a body portion composed of two side panels and two end panels alternately connected in the left - right direction, a paste margin portion connected to one end of the body portion in the left - right direction, an outer flap connected before and after the side panel, and an inner flap connected before and after the end panel. The side panel is longer in the left - right length than the end panel, the outer flap has the same left - right length as the side panel, the inner flap has the same left - right length as the end panel, and in at least one of the front and rear directions, the inner flap is longer in the front - rear length than the outer flap. The side panel and the end panel on the end side in the left - right direction are folded toward the center side in the left - right direction, and the paste margin portion is adhered to the other end of the body portion in the left - right direction. It has two correcting portions positioned front and rear and an auxiliary jig. At least one of the correcting portions is movable in the front - rear direction and abuts on the front edge and the rear edge of the folded sheet across the left - right direction respectively to sandwich the sheet from the front and rear. The auxiliary jig is attached to the correcting portion on the side where the front - rear lengths of the outer flap and the inner flap are different among the front and rear, facing the center in the left - right direction of the folded sheet. The left - right length is shorter than the difference in the left - right lengths of the outer flap and the inner flap, and it abuts on the outer flap when the correcting portion sandwiches the sheet from the front and rear. The outer flap and the inner flap may be slightly shorter in the left - right length than the side panel or the end panel in consideration of the thickness of the sheet, and the present invention includes this case. When the front - rear lengths of the outer flap and the inner flap are different on both sides in the front - rear direction of the sheet, the auxiliary jig is attached to both the front and rear correcting portions. The protruding length of the auxiliary jig from the correcting portion is not limited as long as it abuts on the outer flap when the correcting portion sandwiches the sheet from the front and rear, but it is desirable that the protruding length from the correcting portion is equal to the difference in the front - rear lengths of the outer flap and the inner flap.

[0008] In addition, in the correction device of the present invention, the auxiliary jig has a plurality of divided members that can be stacked one on top of the other in the front - rear direction, and is composed of the divided members selected from among them. By changing the combination of the divided members, the protruding length from the correction part may be adjustable. It is desirable that the divided members have different front - rear lengths. One divided member may be selected and used as the auxiliary jig.

[0009] In addition, in the correction device of the present invention, the auxiliary jig may be movable in the front - rear direction with respect to the correction part, and the protruding length from the correction part may be adjustable. The adjustment range may include the case where the auxiliary jig and the correction part are flush, that is, the protruding length of the auxiliary jig from the correction part is 0.

Advantages of the Invention

[0010] According to the present invention, when the auxiliary jig abuts against the outer flap, for a sheet in which the front - rear lengths of the outer flap and the inner flap are different, the deviation can be corrected by sandwiching it from the front and rear with the correction part. That is, when the side panel and the end panel of a sheet in which the front - rear lengths of the outer flap and the inner flap are different are correctly folded, a concave portion is formed at the center in the left - right direction of the edge of the sheet on the side where the front - rear lengths of the outer flap and the inner flap are different. This concave portion is the portion where the outer flaps overlap vertically, the left - right length is equal to the difference between the left - right lengths of the outer flap and the inner flap, and the front - rear length is equal to the difference between the front - rear lengths of the outer flap and the inner flap. The auxiliary jig has a shape that fits into this concave portion, and when the correction part abuts against the inner flap, the auxiliary jig abuts against the outer flap. Therefore, the deviation can be corrected by sandwiching it from the front and rear with the correction part equipped with the auxiliary jig.

[0011] In addition, if the auxiliary jig can adjust the protruding length from the correction part, it can correspond to various sheets with different differences in the lengths of the outer flap and the inner flap.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0013] First, the sheet targeted by the correction device of the present invention will be described. For the sheet 100, as shown in FIG. 9(a), the front-back and left-right directions are defined. The front side is the direction in which the sheet 100 advances in the later-described box-making device. The sheet 100 includes a body portion 101 composed of two side panels 102 and two end panels 103 that are alternately connected in the left-right direction, a glue margin portion 104 connected to one end (here, the left end) of the body portion 101 in the left-right direction, outer flaps (front outer flap 105a, rear outer flap 105b) connected to the front and rear of the side panel 102, and inner flaps (front inner flap 106a, rear inner flap 106b) connected to the front and rear of the end panel 103. The side panel 102, end panel 103, glue margin portion 104, front outer flap 105a, rear outer flap 105b, front inner flap 106a, and rear inner flap 106b are all rectangular. The side panel 102 and the end panel 103 or the glue margin portion 104 are partitioned by a vertical ruled line 111, which is a fold line extending in the front-back direction. The side panel 102 or the end panel 103 and each flap are partitioned by a horizontal ruled line 112, which is a fold line extending in the left-right direction. The state in which each panel and each flap are connected is a state of being continuous via the vertical ruled line 111 and the horizontal ruled line 112. The flaps are partitioned by a groove portion 113, which is a cut extending in the front-back direction with a width sufficiently narrower than the left-right length of the flap. The side panel 102 is longer in the left-right length than the end panel 103. The front outer flap 105a and the rear outer flap 105b have the same left-right length as the side panel 102, and the front inner flap 106a and the rear inner flap 106b have the same left-right length as the end panel 103. The front inner flap 106a has the same front-back length as the front outer flap 105a. The front-back length of the front outer flap 105a and the front inner flap 106a is 1 / 2 of the left-right length of the end panel 103. The rear inner flap 106b is longer in the front-back length than the rear outer flap 105b. The front-back length of the rear outer flap 105b is 1 / 2 of the left-right length of the end panel 103. The front-back length of the rear inner flap 106b is 1 / 2 of the left-right length of the side panel 102.

[0014] Further, when the side panels 102 and the end face panels 103 on the left and right end sides of this sheet 100 are folded, as shown in FIG. 9(d), a recess 107 is formed at the center in the left-right direction of the trailing edge portion of the sheet 100. This recess 107 is formed on the rear side of the portion where the rear outer flaps 105b overlap each other vertically. The left-right length is equal to the difference in the left-right lengths of the rear outer flap 105b and the rear inner flap 106b, and the front-rear length is equal to the difference in the front-rear lengths of the rear outer flap 105b and the rear inner flap 106b.

[0015] When this sheet 100 is assembled into a box shape, the front side becomes the top surface and the rear side becomes the bottom surface. On the top surface, the front outer flaps 105a abut against each other, and a gap is formed between the front inner flaps 106a. On the bottom surface, both the rear outer flaps 105b and the rear inner flaps 106b abut against each other. Since the rear inner flaps 106b abut against each other, a box without a step on the inside of the bottom surface is formed, so that the contents can be stably accommodated and the strength is high.

[0016] Next, a box-making apparatus having the correction device 500 of the first embodiment of the present invention will be described. As shown in FIG. 5, this box-making apparatus includes a printer slotter 200, a folder gluer 300, and a counter ejector 400 in order from the upstream side (the right side in the figure) of the box-making process. That is, the printer slotter 200, the folder gluer 300, and the counter ejector 400 are arranged side by side from the rear side to the front side in this order. The drawing of the sheet 100 on the upper side of FIG. 5 shows the state of the sheet 100 in each part on the lower side. The correction device 500 of the first embodiment is incorporated in the counter ejector 400.

[0017] Note that the sheet 100 input into this box-making apparatus is a horizontally long rectangle and has only two horizontal ruled lines 112 formed (FIG. 5(1)).

[0018] The printer slotter 200 has a printing unit 210, a grooving unit 220, and a punching unit 230. The printing unit 210 performs printing such as characters and patterns on the surface of the sheet 100 ((2) in FIG. 5). The printing method in the printing unit 210 is not limited, but for example, flexographic printing is used. The grooving unit 220 forms a groove portion 113 and a vertical grid line 111 in the sheet 100, and cuts off the front and rear portions with respect to the adhesive margin portion 104 to form the adhesive margin portion 104 ((3) in FIG. 5). Here, the adhesive margin portion 104 is connected to the left end of the body portion 101. The grooving unit 220 has, for example, a rotating upper blade and a lower blade in a disk shape, and processes the sheet 100 passing between them. The punching unit 230 cuts off the rear portion with respect to the rear outer flap 105b to form the rear outer flap 105b ((4) in FIG. 5). The punching unit 230 has, for example, a cylinder having a cutting tool (punch die) and a cylinder for receiving the cutting tool, and processes the sheet 100 passing between them. The punching unit 230 may form a handle hole or the like in addition to the rear outer flap 105b. A feeder for feeding the sheet 100 into the printer slotter 200 may be provided upstream of the printer slotter 200.

[0019] The folder gluer 300 has a conveyor belt 310, an adhesive application section 320, guide rails 330, and a delivery roller 340. The conveyor belt 310 conveys the sheet 100 forward. The conveyor belt 310 is configured in a pair vertically and extends back and forth, sandwiching the sheet 100 from above and below and sending the sheet 100 forward. The conveyor belt 310 sandwiches the side panel 102 and the end panel 103 on the center side in the left - right direction of the sheet 100. The adhesive application section 320 applies adhesive to the adhesive margin portion 104 of the sheet 100. The adhesive application section 320 has, for example, a pair of upper and lower rollers, and adhesive is supplied to the surface of one of the rollers. As the adhesive margin portion 104 passes between the two rollers, adhesive is applied to the adhesive margin portion 104. The guide rails 330 guide and fold the sheet 100. The guide rails 330 are located on both the left and right sides of the conveyor belt 310 and extend back and forth. The rear end of the guide rail 330 is located above and outside in the left - right direction with respect to the conveyor belt 310, the front end is located below and inside in the left - right direction with respect to the conveyor belt 310, and the portion between the rear end and the front end is smoothly curved. When the sheet 100 is conveyed by the conveyor belt 310, the side panel 102 and the end panel 103 on the end side in the left - right direction of the sheet 100 enter below the rear end of the guide rail 330. As the sheet 100 moves forward, the side panel 102 and the end panel 103 are guided by the guide rail 330 that curves downward and inward, folded downward along the vertical grid line 111, and folded toward the center side ((5) - (7) in FIG. 5). Then, the surface of the adhesive margin portion 104 to which the adhesive is applied abuts against the right end of the body portion 101, and the adhesive margin portion 104 is adhered to the right end of the body portion 101, and the sheet 100 becomes cylindrical. The delivery roller 340 sends the folded sheet 100 to the downstream side. The delivery roller 340 has a pair of upper and lower rotating rollers. The sheet 100 is sandwiched and sent out by the two rollers, and the adhesive margin portion 104 is pressed.

[0020] As shown in FIG. 2, the counter ejector 400 includes two correction parts (fixed plate 401 and movable plate 402) positioned front and rear, an elevator 410, a ledge 420, an auxiliary ledge 430, and a conveyor 440. Both the fixed plate 401 and the movable plate 402 are plate-shaped in a vertical posture and face each other front and rear. However, the movable plate 402 is a single plate extending left and right, and the fixed plate 401 is a plurality of plates arranged at intervals left and right. The movable plate 402 is positioned close to the lower front side of the delivery roller 340 of the folder gluer 300, and the fixed plate 401 is positioned in front of the movable plate 402. The fixed plate 401 is immovable. The movable plate 402 is repeatedly moved back and forth in a vertical posture by a driving part (not shown). When the movable plate 402 is positioned at the most front side, the length between the fixed plate 401 and the movable plate 402 becomes equal to the front and rear length of the folded sheet 100. The elevator 410 is positioned below the fixed plate 401 and the movable plate 402. The elevator 410 is plate-shaped in a horizontal direction, supported at the rear side, and moved up and down by a driving part (not shown). A plurality of elevators 410 are arranged at intervals left and right. The ledge 420 is a plurality of square bar-shaped members extending front and rear, and is alternately arranged with the fixed plate 401 left and right. The ledge 420 is supported at the front side and is moved up and down and back and forth by a driving part (not shown). More specifically, the ledge 420 moves to the rear side and protrudes from the upper part of the fixed plate 401 to the rear side, descends to the lower sides of the fixed plate 401 and the movable plate 402, moves to the front side, and then moves upward to return to the original position. The auxiliary ledge 430 is arranged at the lower part of the fixed plate 401 and the lower part of the movable plate 402. The auxiliary ledge 430 is plate-shaped in a horizontal posture. The front auxiliary ledge 430 is supported at the front side, and the rear auxiliary ledge is supported at the rear side, and each is moved back and forth by a driving part (not shown). More specifically, the auxiliary ledge 430 can move forward and backward from the slits formed in the fixed plate 401 and the movable plate 402 toward the space between the fixed plate 401 and the movable plate 402. The conveyor 440 is a belt conveyor, and the upper surface rotates in a direction moving forward. A plurality of conveyors 440 are arranged at intervals left and right, and are alternately arranged with the elevator 410 left and right. Therefore, even when the elevator 410 moves up and down, it does not contact the conveyor 440.

[0021] An auxiliary jig 403 is provided on the movable plate 402. As shown in FIG. 3, the auxiliary jig 403 has a substantially rectangular parallelepiped shape that is long in the vertical direction. At the upper end portion, the left and right corner portions are chamfered and tapered upward. The auxiliary jig 403 has a left-right length shorter than the difference in the left-right lengths of the rear outer flap 105b and the rear inner flap 106b, and a front-rear length equal to the difference in the front-rear lengths of the rear outer flap 105b and the rear inner flap 106b. The auxiliary jig 403 is fixed to the front surface of the movable plate 402 by screwing. That is, the front surface of the auxiliary jig 403 protrudes forward by the front-rear length of the auxiliary jig 403 with respect to the front surface of the movable plate 402. The auxiliary jig 403 is located at the center in the left-right direction of the movable plate 402. Such an auxiliary jig 403, the fixed plate 401, and the movable plate 402 constitute the correction device 500 of the first embodiment.

[0022] As shown in Fig. 3, the auxiliary jig 403 has a plurality of split members (contact member 404 and adjustment member 405) that can be stacked front and back. In the illustrated example, it has one contact member 404 and two adjustment members 405. The contact member 404 is made of resin, and the adjustment member 405 is made of metal. The contact member 404 and the adjustment member 405 have the same shape when viewed from the front-back direction. The contact member 404 is longer in the front-back length than the adjustment member 405. A plurality of contact members 404 and adjustment members 405 with different front-back lengths are prepared respectively. For example, the contact member 404 has five types with front-back lengths of 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm. The adjustment member 405 has five types with front-back lengths of 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm. The auxiliary jig 403 is configured by stacking the selected contact member 404 and / or adjustment member 405 front and back. When the contact member 404 and the adjustment member 405 are stacked, the adjustment member 405 is positioned on the rear side of the contact member 404, that is, the adjustment member 405 is sandwiched between the contact member 404 and the movable plate 402. The auxiliary jig 403 can adjust the front-back length (the protruding length from the front surface of the movable plate 402) by changing the combination of the contact member 404 and the adjustment member 405 as described above. That is, the contact member 404 and the adjustment member 405 are appropriately combined so that the front-back length of the auxiliary jig 403 is equal to the difference in the front-back lengths of the rear outer flap 105b and the rear inner flap 106b. According to the above total of 10 types of contact members 404 and adjustment members 405, the front-back length can be adjusted in 1 mm units from 1 mm to 99 mm. However, since the auxiliary jig 403 contacts the sheet 100 that becomes the product, it is desirable to arrange at least the resin-made contact member 404 at the forefront so as not to damage the sheet 100. In that case, the front-back length can be adjusted in 1 mm units from 10 mm to 99 mm.

[0023] The operation of the counter ejector 400 configured as described above will be described. As shown in Fig. 4(a), initially, the elevator 410 is positioned directly below the fixed plate 401 and the movable plate 402 at the uppermost position. The ledge 420 is above the fixed plate 401 at the uppermost position and is located on the front side (a position that does not protrude from the fixed plate 401). The auxiliary ledge 430 protrudes between the fixed plate 401 and the movable plate 402. In this state, the folded sheet 100 is continuously fed from the delivery roller 340 of the upstream folder gular 300. The sheet 100 fits between the fixed plate 401 and the movable plate 402. The first sheet 100 is placed on the auxiliary ledge 430, and subsequent sheets 100 are stacked on top of it. Here, the sheet 100 is corrected by the correction device 500 (the fixed plate 401, the movable plate 402, and the auxiliary jig 403), which will be described later. When a predetermined number of sheets 100 are fed from the delivery roller 340, as shown in Fig. 4(b), the front and rear auxiliary ledges 430 retract and do not protrude from the fixed plate 401 and the movable plate 402. Then, the sheets 100 stacked on the auxiliary ledge 430 fall onto the elevator 410. Also, in accordance with the retraction of the auxiliary ledge 430, the ledge 420 protrudes rearward from the fixed plate 401 and descends to be positioned above the stacked sheets 100. Thus, the next sheet 100 is placed on the ledge 420, and subsequent sheets 100 are stacked on top of it. That is, the ledge 420 divides the sheets 100 into predetermined numbers. The elevator 410 with the sheets 100 placed on it starts to descend. After that, as shown in Fig. 4(c), the elevator 410 descends below the conveyor 440, and the stacked sheets 100 are placed on the conveyor 440 and conveyed forward. Then, the elevator 410 rises to its original position. Also, the front and rear auxiliary ledges 430 protrude between the fixed plate 401 and the movable plate 402, the ledge 420 descends below the auxiliary ledge 430, and the sheet 100 is placed on the auxiliary ledge 430. Then, the ledge 420 moves forward and further upward to return to its original position. This is repeated, and the sheets 100 are carried out in a state where they are stacked in predetermined numbers.

[0024] Then, the correction of the sheet 100 by the correction device 500 will be described in detail. The sheet 100 folded by the folder gluer 300 may not be folded along the correct fold lines (vertical grid lines 111) due to various reasons, and as shown in FIG. 9(b), the lower panels and flaps may be displaced back and forth with respect to the upper panels and flaps. This displacement is corrected by the correction device 500 before the glue applied to the glue margin portion 104 is completely cured.

[0025] As the sheet 100 passes through the counter ejector 400, as shown in FIG. 1, it is sandwiched between the fixed plate 401 and the movable plate 402 from the front and rear. The fixed plate 401 is stationary, and the movable plate 402 moves back and forth repeatedly. When the movable plate 402 is located at the most forward position, the fixed plate 401 abuts against the front edge of the sheet 100 across the left and right (with a gap), and the movable plate 402 abuts against the rear edge of the sheet 100 across the left and right. At this time, on the front side of the sheet 100, since the front - to - rear lengths of the front outer flap 105a and the front inner flap 106a are the same, the fixed plate 401 abuts against both the front outer flap 105a and the front inner flap 106a. On the other hand, on the rear side of the sheet 100, since the rear inner flap 106b is longer in the front - to - rear length than the rear outer flap 105b, the movable plate 402 abuts against the rear inner flap 106b but does not abut against the rear outer flap 105b. Therefore, the front inner flap 106a, the end face panel 103, and the rear inner flap 106b that are connected front - to - rear are sandwiched between the fixed plate 401 and the movable plate 402 from the front and rear, but the front outer flap 105a, the side face panel 102, and the rear outer flap 105b are not sandwiched, so they cannot be corrected only by the fixed plate 401 and the movable plate 402. Here, when the movable plate 402 abuts against the rear inner flap 106b, the auxiliary jig 403 attached to the movable plate 402 faces the center of the sheet 100 in the left - right direction and fits into the recess 107 formed at the center of the rear edge portion of the sheet 100 in the left - right direction. The left - right length of the auxiliary jig 403 is shorter than the left - right length of the recess 107, and the front - to - rear length of the auxiliary jig 403 is equal to the front - to - rear length of the recess 107, so the front surface of the auxiliary jig 403 abuts against the bottom surface of the recess 107, that is, the rear outer flap 105b. As a result, the front outer flap 105a, the side face panel 102, and the rear outer flap 105b that are connected front - to - rear are also sandwiched between the fixed plate 401 and the auxiliary jig 403 from the front and rear. That is, since the entire sheet 100 is repeatedly sandwiched from the front and rear, the displaced lower panels and flaps are aligned with the upper panels and flaps, and the displacement is corrected.

[0026] As described above, according to the correction device 500 of the first embodiment, when the auxiliary jig 403 provided on the movable plate 402 abuts against the rear outer flap 105b, for the sheet 100 in which the front-back lengths of the rear outer flap 105b and the rear inner flap 106b are different, the fixing plate 401 and the movable plate 402 can sandwich it from the front and back to correct the deviation. Since the auxiliary jig 403 can adjust the front-back length (the protruding length from the movable plate 402) by changing the combination of the contact member 404 and the adjustment member 405, it can correspond to various sheets 100 with different differences in the lengths of the rear outer flap 105b and the rear inner flap 106b. Also, in the auxiliary jig 403, by arranging the resin-made contact member 404 at the forefront and bringing it into contact with the sheet 100, damage to the sheet 100 can be prevented. Furthermore, since the auxiliary jig 403 has a shape that tapers upward, the sheet 100 fed from above is less likely to get caught, and the sheets 100 can be stacked smoothly. And according to the box-making device equipped with the correction device 500 of the present invention, for the sheet 100 in which the lengths of the rear outer flap 105b and the rear inner flap 106b are different, a series of procedures from folding, adhering, to correcting can be automated.

[0027] Next, the correction device 500a of the second embodiment will be described. Regarding the correction device 500a of the second embodiment, the point that it is incorporated in the counter ejector 400 of the box-making device is the same as that of the correction device 500 of the first embodiment. As shown in FIG. 6, the correction device 500a of the second embodiment has a fixing plate 401, a movable plate 402, and two auxiliary jigs 403, and the auxiliary jigs 403 are attached to both the fixing plate 401 and the movable plate 402. The auxiliary jig 403 is provided at the position in the center in the left-right direction on the rear surface of the fixing plate 401 and at the position in the center in the left-right direction on the front surface of the movable plate 402, and the auxiliary jigs 403 face each other front and back.

[0028] According to the correction device 500a of the second embodiment as described above, it is possible to correct the sheet 100a with different flap lengths on both the front and rear sides. In this sheet 100a, the front inner flap 106a is longer in the front-rear length than the front outer flap 105a, and the rear inner flap 106b is longer in the front-rear length than the rear outer flap 105b. When this sheet 100a is folded, a concave portion 107 is formed at the center in the left-right direction of the front edge and the rear edge of the sheet 100a. And when this sheet 100a is sandwiched from the front and rear by the fixed plate 401 and the movable plate 402, the front and rear auxiliary jigs 403 are respectively fitted into the front and rear concave portions 107. That is, the fixed plate 401 abuts on the front inner flap 106a, and the auxiliary jig 403 attached to the fixed plate 401 abuts on the front outer flap 105a. The movable plate 402 abuts on the rear inner flap 106b, and the auxiliary jig 403 attached to the movable plate 402 abuts on the rear outer flap 105b. Thereby, it is possible to correct the sheet 100a with different flap lengths on both the front and rear sides.

[0029] Next, the correction device 500b of the third embodiment will be described. Regarding the correction device 500b of the third embodiment, the point that it is incorporated in the counter ejector 400 of the box-making device is the same as that of the correction device 500 of the first embodiment. As shown in FIG. 7, the correction device 500b of the third embodiment includes a fixed plate 401, a movable plate 402, an auxiliary jig 403, and a driving device 406. The driving device 406 is, for example, an air cylinder, and has a cylinder 407 and a piston 408 that moves forward and backward with respect to the cylinder 407. The cylinder 407 penetrates the center in the left-right direction of the movable plate 402 in the front-rear direction and is fixed to the movable plate 402. The piston 408 protrudes from the front side of the cylinder 407. The auxiliary jig 403 is attached to the front end of the piston 408. Therefore, the auxiliary jig 403 moves back and forth with respect to the movable plate 402 by the forward and backward movement of the piston 408. When the piston 408 is retracted to the maximum, the front surface of the auxiliary jig 403 is flush with the front surface of the movable plate 402. When the piston 408 is extended, the auxiliary jig 403 protrudes forward from the movable plate 402, and the protruding length can be freely adjusted by the operation of the piston 408.

[0030] According to the correcting device 500b of the third embodiment as described above, similar to the first embodiment, the sheet 100 with different lengths of the rear flaps can be corrected. Since the protruding length of the auxiliary jig 403 can be adjusted by the driving device 406, it is possible to cope with various sheets 100 with different differences in the lengths of the rear outer flap 105b and the rear inner flap 106b without replacing the auxiliary jig 403. Further, if the front surface of the auxiliary jig 403 is flush with the front surface of the movable plate 402, it is also possible to cope with a sheet having the same length for each flap.

[0031] Note that the auxiliary jig 403 may be provided only on the movable plate 402 as in the first embodiment or the third embodiment, may be provided on both the fixed plate 401 and the movable plate 402 as in the second embodiment, or may be provided only on the fixed plate 401. When having the driving device 406 as in the third embodiment, the driving device 406 may be provided on both the fixed plate 401 and the movable plate 402, or may be provided only on the fixed plate 401.

[0032] The present invention is not limited to the above-described embodiments, and within the scope of the gist of the invention, the shape and structure of each part can be appropriately changed. For example, the correcting part is not limited to a plate shape and may have any shape. Both the front and rear correcting parts may be movable in the front-rear direction. The auxiliary jig is not limited to a rectangular parallelepiped shape and may have any shape. The driving device for moving the auxiliary jig is not limited to an air cylinder, and various actuators can be used. Further, a structure for manually adjusting the position of the auxiliary jig may be adopted. Regarding parts other than the correcting device, an example is shown, and this correcting device may be incorporated into a case-making device having a different structure.

Explanation of Reference Numerals

[0033] 100 Sheet 101 Body 102 Side Panel 103 End Panel 104 Glue Margin Part 105a Front Outer Flap (Outer Flap) 105b Rear Outer Flap (Outer Flap) 106a Front inner flap (inner flap) 106b Rear inner flap (inner flap) 401 Fixed plate (correction part) 402 Movable plate (correction part) 403 Auxiliary jig 404 Contact member (dividing member) 405 Adjusting member (dividing member) 500 Correction device

Claims

1. A straightening device for straightening the shape of a folded cardboard sheet to form a box, comprising: the sheet has a body portion consisting of two side panels and two end panels connected alternately in the left-right direction, a glue tab connected to one left-right end of the body portion, an outer flap connected to the front and rear of the side panels, and an inner flap connected to the front and rear of the end panels, the side panels having a longer left-right length than the end panels, the outer flaps having the same left-right length as the side panels, the inner flaps having the same left-right length as the end panels, and the inner flaps having a longer front-to-back length than the outer flaps at least on either the front or back, the side panels and the end panels at the left-to-right end sides are folded toward the center in the left-to-right direction, and the glue tab is adhered to the other left-to-right end of the body portion, It has two correction units located at the front and rear and an auxiliary jig, At least one of the correction units is movable in the front-rear direction and is adapted to contact the front and rear edges of the folded sheet on the left and right sides, respectively, to sandwich the sheet from the front and rear, The correction device is characterized in that the auxiliary tool is attached opposite the left-right center of the folded sheet to the correction section on the front or rear side where the front-to-back lengths of the outer flap and the inner flap are different, the left-to-right length is shorter than the difference in the left-to-right lengths of the outer flap and the inner flap, and the correction section abuts against the outer flap when it clamps the sheet from the front and back.

2. The correction device according to claim 1, characterized in that the auxiliary jig has a plurality of divided members that can be stacked front to back, and is composed of divided members selected from among the divided members, and the protruding length from the correction section can be adjusted by changing the combination of the divided members.

3. The orthodontic device according to claim 1, wherein the auxiliary jig is movable in the front-rear direction relative to the orthodontic portion, and the length of projection of the auxiliary jig from the orthodontic portion is adjustable.

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