JP2006035758A - Folding apparatus of corrugated cardboard sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding apparatus of a corrugated cardboard sheet capable of obtaining a corrugated cardboard box enhanced in dimensional precision. <P>SOLUTION: The corrugated cardboard sheet S<SB>1</SB>, which has first-fourth panels P<SB>1</SB>-P<SB>4</SB>divided by first-fourth longitudinal rules a<SB>1</SB>-a<SB>4</SB>and the joining flap P<SB>5</SB>connected to the side edge of the fourth panel P<SB>4</SB>and has the first and third longitudinal rules a<SB>1</SB>and a<SB>3</SB>formed thereto as two parallel rules, is fed to a folding part 30. The first and fourth panels P<SB>1</SB>and P<SB>4</SB>on both sides divided by the longitudinal rules are folded by 90° along the outside rules 1<SB>1</SB>of the first and third longitudinal rules a<SB>1</SB>and a<SB>3</SB>provided to their insides during the feed of the corrugated cardboard sheet through the folding part 30 and the part between the parallel rules 1<SB>1</SB>and 1<SB>2</SB>is folded by 90° along the inside rule 1<SB>2</SB>after the first and fourth panels P<SB>1</SB>and P<SB>4</SB>are folded by 90° and the overlapped part of the first panel P<SB>1</SB>and the joining flap P<SB>5</SB>is bonded to form a flat box body A<SB>1</SB>. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cardboard sheet folding apparatus for forming a flat box body by bending and bonding both sides of a flat cardboard sheet having a joining margin on one side.

As forming material for flat box body, the corrugated sheet S ₁₁ shown in FIG. 23 has been known. The cardboard sheet S ₁₁ has a bonding margins P ₁₅ and the first vertical line a ₁₁ to the first panel P ₁₁ to fourth panels P ₁₄ which is partitioned by the fourth vertical line a _14, the first panel P ₁₁ or lid flaps F ₁₁ via the horizontal lines b ₁₁ is continuously provided on one edge of the fourth panel P _14, and bottom flaps F ₁₂ via a horizontal ruled line b ₁₂ is continuously provided at the other edge The

As a folder gluer that forms a flat box from the corrugated cardboard sheet S ₁₁ as described above, the one described in Patent Document 1 is conventionally known.

The folder gluer faces the first panel P ₁₁ and the fourth panel P ₁₄ on both sides along the first vertical ruled line a ₁₁ and the third vertical ruled line a ₁₃ while conveying the cardboard sheet S ₁₁ in one direction. The flat box A ₁₁ as shown in FIG. 24 is formed by bending 180 ° in the direction to be bonded and bonding the overlapping portion of the joint allowance P ₁₅ and the first panel P ₁₁ to each other.

Further, in the cardboard sheet folding apparatus described in Patent Document 2, the first vertical ruled line a ₁₁ inside the first panel P _{11 and} the inside of the fourth panel P ₁₄ of the cardboard sheet S ₁₁ shown in FIG. The third vertical ruled line a _{13 is made} into two parallel ruled lines, and the first panel P ₁₁ and the fourth panel P ₁₄ are bent in opposite directions along the two parallel ruled lines guided by the bending guide, The overlapping portion of the first panel P ₁₁ and the joint allowance P ₁₅ is adhered to each other.
Japanese Utility Model Publication No. 6-21926 JP-A-10-296885

Incidentally, the cardboard sheet S ₁₁ first vertical borders inside a first panel P ₁₁ and the fourth panel P ₁₄ on both sides while conveying the a ₁₁ and a 3 shown in FIG. 23 by the folder gluer described in Patent Document 1 as you bent along the vertical ruled a _13, because the first vertical line a ₁₁ and the third vertical line a ₁₃ is the border of the respective one article, folding the first panel P ₁₁ and the fourth panel P ₁₄ in the middle, as shown in FIG. 25, both side portions b of the third vertical line a ₁₃ is to interfere in contact, also in the same state in the first vertical line a ₁₁ parts.

For corrugated sheet S ₁₁ is to have a core paper in which is corrugated, the strength of the side portions b is often heterogeneous. Therefore, when bending as shown in FIG. 25, the strong side part crushes the weak side part, and the first panel P ₁₁ and the fourth panel P ₁₄ are bent 180 ° and flattened. When the box A ₁₁ is formed, as shown in FIGS. 26 (I) and (II), the outer fold line L ₁₁ has the first panel P ₁₁ , the second panel P _12, the third panel P ₁₃ and the second panel P ₁₁ . abutment surface of 4 panels P ₁₄ from (panel abutment surface) offset in either the vertical direction so that occurs.

As shown in FIG. 26 (I), when the folding line L ₁₁ is offset upward from the panel abutting surface which is the normal position, the overlapping width W ₁₁ between the joining margin P ₁₅ and the first panel P ₁₁ is as follows. larger than the appropriate width, and as shown in FIG. 26 (II), when the folding line L ₁₁ is biased downwardly from the panel abutment surface which is the proper position, the bonding margins P ₁₅ second since the overlapping width W ₁₂ of the first panel P ₁₁ is smaller than the proper width, and Hirakibako formed a flat box a ₁₁ at the four corners tubular in the case of forming a cardboard box, a box of square Therefore, there arises a problem that a corrugated cardboard box with high dimensional accuracy cannot be obtained.

On the other hand, in the folding apparatus of the cardboard sheet described in Patent Document 2, vertical lines a _11, a _13, respectively inside of the first panel P ₁₁ and the fourth panel P ₁₄ is parallel borders Article 2, the parallel The folding of the ruled line is guided by the folding guide, but when the first panel P ₁₁ and the fourth panel P ₁₄ are folded, the folding guide folds either the outer ruled line of the parallel ruled line or the inner ruled line. Nothing is described about guiding the bending. For this reason, if the folding is simply performed from the parallel ruled lines, the first panel P ₁₁ and the fourth panel P ₁₄ are folded along the outer ruled lines of the parallel ruled lines, or folded along the inner ruled lines. Thus, as with the folder gluer described in Patent Document 1, it is impossible to obtain a cardboard box with high dimensional accuracy.

  An object of the present invention is to provide a corrugated sheet folding apparatus that can obtain a corrugated box with high dimensional accuracy.

  In order to solve the above-mentioned problem, in the present invention, there are four panels divided by vertical ruled lines and a joining margin continuously provided on the side edge of one panel, and provided inside the panels on both sides. The corrugated cardboard sheet in which the vertical ruled lines formed into two parallel ruled lines are conveyed in one direction by the sheet conveying device, and the panels on both sides of the cardboard sheet are guided by the folding guides by the panel folding means during the conveyance. Folding corrugated cardboard sheets that are bent 180 ° in the opposite direction along the ruled line, and the overlap between the side margin of the panel on one side and the panel on the other side are bonded via an adhesive In the apparatus, the folding guide includes a first folding guide for guiding the folding of the outer ruled line of the parallel ruled lines, and a second folding guide for guiding the folding of the inner ruled line, and the panel folding is provided. The step comprises first folding means for folding the outer ruled line along the first folding guide, and second folding means for folding the inner ruled line along the second folding guide, After the first folding means bends the panels on both sides approximately 90 ° along the outer ruled line guided by the first folding guide, the second folding means bends the second portion between the parallel ruled lines. A configuration was adopted in which it was bent 90 ° along the inner ruled line guided by the guide.

  In the corrugated sheet folding apparatus having the above structure, the first folding means folds the panels on both sides of the corrugated sheet along the outer ruled lines of the parallel ruled lines by 90 °, and further folds 90 °, and both sides thereof. In the state where the panel is folded 90 °, the portion between the parallel ruled lines is folded 90 ° along the inner ruled line of the parallel ruled lines by the second folding means. In addition, when folding along the outer and inner ruled lines, the outer ruled line is guided by the first folding guide and the inner ruled line is guided by the second folding guide. Can be bent along the line with extremely high accuracy.

  Therefore, it is possible to form a flat box body in which the overlapping width between the joining margin provided on the side edge of the panel on one side and the panel on the other side is constant, and the box body is opened in a rectangular tube shape. When boxed, a cardboard box with a very high dimensional accuracy can be obtained.

  Embodiments of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 (I) and (II), the corrugated sheet folding apparatus includes a sheet feeding unit 1, an aligning and conveying unit 10, a crease forming unit 20, a folding unit 30, a correcting unit 50, and a forming unit 60. The configuration is arranged in tandem.

As shown in FIG. 2, the sheet feeding unit 1 includes a hopper 2 and a stack of corrugated cardboard sheets S ₀ accommodated in the hopper 2, one by one in order from the lowest cardboard sheet S _0. And a sheet feeding device 3 for feeding to the aligning and conveying unit 10.

The hopper 2 includes a table 4 that supports the stacked cardboard sheets S ₀ , a front guide 5 that positions a front edge of the cardboard sheets S ₀ placed on the table 4, and a rear end of the cardboard sheets S ₀ . has side guides 7 for positioning the opposite side edges of the back guide 6 and the corrugated sheet S ₀ to position the edges.

Here, the corrugated sheet S _0, as shown in FIG. 5 (I), a rectangular shape, bonding margins P ₅ is formed on one side thereof. Further, four lid flaps F ₁ are connected to the front end edge of the corrugated cardboard sheet S ₀ via a horizontal ruled line b _1, and a bottom flap F ₂ is connected to the rear end edge of the cardboard sheet S ₀ via a horizontal ruled line b _2. ing.

As shown in FIG. 2, the sheet feeding device 3 includes a plurality of feeding rollers 8. Each feed roller 8 is rotated in the direction of the arrow in the figure, and the cardboard sheets S ₀ accommodated in the hopper 2 by contact with each feed roller 8 are successively conveyed one by one from the lower part to the alignment conveyance unit 10. .

As shown in FIGS. 2 and 3, the aligning and conveying unit 10 includes a double row sheet conveying belt 11 that conveys the corrugated cardboard sheet S ₀ to the downstream side, and a plurality of air jets provided below the sheet conveying belt 11. It comprises a duct 12 and a reference guide 13 provided in parallel with the center line of the apparatus on one side of the conveyance path of the cardboard sheet S ₀ conveyed by the sheet conveyance belt 11.

The air injection duct 12 has a large number of air injection holes 14, and air is injected upward from the air injection holes 14, and the cardboard sheet S ₀ sent from the paper supply unit 1 to the alignment conveyance unit 10. Is pressed against the carrier side belt 11a on the lower side of the sheet conveying belt 11 by the air ejected from the air ejection holes 14, and is conveyed downstream by the carrier side belt 11a.

The double-row sheet conveying belts 11 are inclined so that the carry-out end is shifted toward the reference guide 13 from the carry-in end. For this reason, the corrugated cardboard sheet S ₀ conveyed downstream by the contact of the sheet conveying belt 11 with the carrier side belt 11 a is caused to be brought closer to the reference guide 13 side while being conveyed downstream, and the other side edge is the reference edge. It is brought into contact with the guide 13 and fed along the reference guide 13 to the downstream crease forming section 20. That is, the corrugated cardboard sheet S ₀ is fed into the crease forming unit 20 with the other side edge as a reference.

The aligning / conveying unit 10 is provided with an adhesive injection nozzle 15 for injecting an adhesive to a joining margin P ₅ at one side edge of the corrugated cardboard sheet S ₀ .

  The crease forming unit 20 includes four anvil rolls 21 and a crease roll 22 provided below each anvil roll 21, and an annular crease ridge 23 is provided on the outer periphery of each crease roll 22. It has been.

As shown in FIG. 5, the anvil roll 21 and the crease roll 22 are rotated in the direction of the arrow in FIG. 2 and are folded on the lower surface of the corrugated cardboard sheet S ₀ fed from the aligning / conveying section 10 to the crease forming section 20. The first vertical ruled line a _{1 to} the fourth vertical ruled line a ₄ are formed. S ₁ represents a cardboard sheet after ruling insertion, the corrugated board sheet S ₁ is divided into a first panel P ₁ to fourth panels P ₄ by the first vertical line a ₁ to fourth vertical line a _4.

Here, the first vertical ruled line a ₁ inside the first panel P ₁ and the third vertical ruled line a ₃ inside the fourth panel P ₄ are ruled by the ruled roll 22 shown in FIG. The crease roll 22 has two crease ridges 23 on the outer periphery, and the crease lines are creased by crushing the cardboard sheet S ₀ by each crease ridge 23.

Therefore, the first vertical line a ₁ and the third vertical line a ₃ is formed by a parallel borders l _1, l ₂ of Article 2, the interval of the parallel borders l _1, l ₂ of 2 Article of the cardboard sheet S ₀ It is almost equal to the thickness.

Since the second ruled line a ₂ and the fourth vertical ruled line a ₄ are not bent at the bending part 30, they are formed by the ruled roll 22 having one ruled protrusion 23.

Here, since the corrugated board sheet S ₀ is sent to the crease forming section 20 by using the other side edge as a reference position by the aligning / conveying section 10, the crease forming section 20 sets the first vertical position at an appropriate position of the corrugated board sheet S _0. The ruled line a _{1 to} the fourth vertical ruled line a ₄ can be marked with extremely high accuracy.

In the embodiment, the interval between the two ruled ridges 23 on the outer periphery of the crease roll 22 is constant, but the interval between the two ruled ridges 23 is adjustable so that the thickness of the corrugated cardboard sheet S ₀ can be adjusted. Accordingly, the interval between the two ruled ridges 23 may be adjusted.

Further, in the embodiments, and so as to put crease four vertical ruled lines of the corrugated board sheet S ₀ by ruling insertion processing portion 20 first vertical lines a ₁ to fourth vertical lines a _4, the corrugated sheet S ₀ A second vertical ruled line a ₂ and a fourth vertical ruled line a ₄ are formed in advance, and the first vertical ruled line a ₁ and the third vertical ruled line a ₃ are ruled by the crease forming section. You may do it.

The corrugated cardboard sheet S ₁ after the crease is fed into the bent portion 30. 6 to 13 show details of the bent portion 30.

As shown in FIGS. 6 and 7, the folding unit 30 includes a pair of upper transport belts 31 and a pair of lower transport belts 32 as a sheet transport device that transports the corrugated cardboard sheet S ₁ to the downstream side. ing.

One of the pair of upper transport belts 31 is provided at a position corresponding to the side of the second panel P ₂ of the cardboard sheet S ₁ on the first vertical ruled line a ₁ side, and the other is the third panel of the cardboard sheet S ₁ . It is provided at a position corresponding to the side portion of P ₃ on the third vertical ruled line a ₃ side.

  As shown in FIGS. 10 to 12, suction holes 33 are formed in each of the upper conveyance belts 31 as a whole. A suction box 34 is provided on the carrier side belt 31a below the upper transport belt 31, and a slit 35 extending in the moving direction of the carrier side belt 31a is formed in the belt guide plate 34a below the suction box 34. Is formed.

Thus, when sucking the internal air of the suction box 34, suction to the suction holes 33 of the carrier belt 31a is applied, corrugated board sheet S ₁ is adsorbed by the carrier side belt 31a, it is conveyed.

  As shown in FIG. 7, the lower conveyor belt 32 is shorter than the upper conveyor belt 31, and is provided below each upper conveyor belt 31 so that the carry-in end thereof substantially coincides with the carry-in end of the upper carry belt 31. ing.

Upper carrier side belt 32a of the lower conveying belt 32 has become the corrugated fiberboard sheet S ₁ at the carrier side belt 31a of the upper transport belt 31 from above and below so as to sandwich, corrugated board sheet S ₁ is the carrier side of the upper conveyor belt 31 The belt is transported downstream by suction by the belt 31a and the carrier-side belt 31a of the upper transport belt 31 and the carrier-side belt 32a of the lower transport belt 32.

As shown in FIG. 13, a pair of first folding guides 36 and a pair of second folding guides 37 that extend long in the conveyance direction of the cardboard sheet S ₁ are provided below the cardboard sheet S ₁ conveyance path. is provided by shifting the position in the conveying direction of the sheet S _1.

One of the pair of first folding guides 36 is provided at a position corresponding to the outer ruled line l _{1 of} the third vertical ruled line a ₃ formed on the cardboard sheet S ₁ as shown in FIG. Is provided at a position corresponding to the outer ruled line l _{1 of} the first vertical ruled line a _{1 in} the same manner as shown in FIG.

Further, as shown in FIG. 10, one of the pair of second bending guides 37 is provided at a position corresponding to the inner ruled line l _{2 of} the third vertical ruled line a ₃ and the other is shown in FIG. Similarly to the above, the first vertical ruled line a ₁ is provided at a position corresponding to the inner ruled line l ₂ .

As shown in FIG. 6, each outer side of the pair of upper transport belt 31, the outer borders l ₁ of each first vertical lines a ₁ of the first panel P ₁ and the fourth panel P ₄ of the cardboard sheet S ₁ A pair of panel bending belts 38 (first bending means) are provided as panel bending means for bending 180 ° downward along the outer ruled line l ₁ of the third vertical ruled line a ₃ .

Corrugated sheet S ₁ and the opposite lower the carrier side belt 38a of the panel folding belt 38 twisting is applied is guided by a plurality of belt guide rollers 39, delivery tip of the carrier-side belt 38a is an upper conveyor belt 31 The carrier side belt 31a is arranged to face the upper and lower sides.

Carrier-side belt 38a of the pair of panel folding belt 38 is pushed down the first panel P ₁ and the fourth panel P ₄ of the cardboard sheet S _1, the the first panel P ₁ and the fourth panel P ₄ respectively 1 The sheet is bent by 90 ° along the outer ruled line l ₁ of the vertical ruled line a ₁ and the third vertical ruled line a ₃ and then bent by 90 °. At this time, the pair of first folding guides 36 guide the movement of the outer ruled line l ₁ until the first panel P ₁ and the fourth panel P ₄ are bent 90 ° downward.

In order to make the first panel P ₁ and the fourth panel P ₄ bend 90 ° along the outer ruled line l ₁ and then bend completely 90 °, the first panel P ₁ and the fourth panel P ₄ One end portion of the folding rod 40 extending in the transport direction is disposed on the outer side of the position bent 90 °, and the other end portion of the transport path for the second panel P ₂ and the third panel P ₃ of the cardboard sheet S ₁ is disposed. The first panel P ₁ and the fourth panel P ₄ which are disposed below and bent by 90 ° are further bent by 90 ° in the same direction by contact with the folding bar 40.

As shown in FIG. 6, the first vertical ruled line a ₁ and the third vertical ruled line a of the corrugated cardboard sheet S ₁ shown in FIG. 5 are interposed between the pair of upper conveying belts 31 and the panel folding belts 38 provided on the outer sides thereof. bending forming belt 41 of the portion P ₆ between the outer borders l ₁ and the inner borders l ₂ as a second bending means for bending 90 ° folding along the inside border l ₂ of ₃ are provided, respectively.

  One end of the folding belt 41 faces a position slightly offset downstream from the carry-in end of the upper conveyance belt 31, and the other end is arranged at a position substantially corresponding to the carry-out end of the panel folding belt 38. Yes.

The carrier side belt 41a below the folding belt 41 is guided by a plurality of belt guide rollers 42 in a range from a position slightly offset to the downstream side from the downstream end of the first folding guide 36 to the carry-out end portion. The torsion is applied, and the portion P ₆ between the outer ruled line l ₁ and the inner ruled line l ₂ of the corrugated cardboard sheet S ₁ is lowered downward along the inner ruled line l ₂ guided by the second folding guide 37. It is designed to bend 90 °.

As shown in FIG. 6, a claw-conveying belt 43 that presses and moves the corrugated cardboard sheet S ₁ toward the downstream side is provided inside each of the pair of upper conveying belts 31. A plurality of push claws 44 that can come into contact with the trailing edge of the corrugated cardboard sheet S _{1 in} the conveyance direction are provided at equal intervals on the conveyance belt 43 with the claws.

The carry-in end of the claw-conveying belt 43 is located between the carry-out end of the lower carrying belt 32 and the carry-in end of the panel folding belt 38, and the carry-out end is located downstream from the carry-out end of the panel folding belt 38. ing. This claw-conveying belt 43 is timed to convey the cardboard sheet S ₁ so that the pushing claw 44 engages with the trailing edge of the cardboard sheet S ₁ conveyed by the upper conveyance belt 31 and the lower conveyance belt 32. The conveyance speed of the claw-conveying belt 43 and the conveyance speed of the cardboard sheet S ₁ by the upper conveyance belt 31 and the lower conveyance belt 32 are the same.

In the folding unit 30 having the above-described configuration, when the corrugated cardboard sheet S ₁ is fed from the creasing processing unit 20, the corrugated cardboard sheet S ₁ is supported by the first folding guide 36 and is conveyed upward. It is sandwiched from above and below by the belt 31 and the lower conveyance belt 32 and is conveyed downstream along the first bending guide 36. In its transport course, the carrier side belt 38a of the panel folding belt 38 presses down each panel P _1, P ₄ in contact with the first panel P ₁ and the fourth panel P _4, by the carrier-side belt 38a The first panel P ₁ and the fourth panel P ₄ are bent 90 °.

At this time, the first panel P ₁ and the fourth panel P ₄ are bent along the outer ruled line l ₁ guided by the first folding guide 36.

Although FIG. 9 shows only the bent state of the fourth panel P ₄ , the first panel P ₁ is bent in the same manner.

Thereafter, when the first panel P ₁ and the fourth panel P ₄ are bent at a predetermined angle and the rear end of the corrugated board sheet S _{1 in} the conveyance direction reaches the carry-in end of the conveyance belt 43 with the claw, the conveyance belt 43 with the claw is pushed. pawl 44 is forcibly convey the corrugated board sheet S ₁ engages the rear edge of the cardboard sheet S _1.

When the first panel P ₁ and the fourth panel P ₄ are bent downward by approximately 90 °, the corrugated cardboard sheet S ₁ is transferred from the first folding guide 36 to the second folding guide 37, and the second folding guide 37. Thus, the inner ruled line l ₂ of the first vertical ruled line a ₁ and the third vertical ruled line a ₃ is supported.

At this time, twisting beginning of the carrier belt 41a in bending forming belt 41 begins to press the portion P ₆ between the outer borders l ₁ and the inner borders l ₂ of the cardboard sheet S _1, is the portion P ₆ by the pressing It can be bent downward.

In this case, the portion P ₆ is bent along the inner ruled line l ₂ of the third vertical ruled line a ₃ guided by the second folding guide 37 as shown in FIG. The first vertical line a ₁ parts is similar.

Further, when the first panel P ₁ and the fourth panel P ₄ are bent downward by approximately 90 °, the first panel P ₁ and the fourth panel P ₄ start to come into contact with the folding rod 40, and the folding rod 40 The panels P ₁ and P ₄ are further bent in the same direction by the contact with the belt and the pressing of the carrier side belt 38 a of the panel bending belt 38.

When the cardboard sheet S ₁ reaches the carry-out end portion of the panel folding belt 38, as shown in FIG. 12, the portion P ₆ between the outer ruled line l ₁ and the inner ruled line l ₂ is bent by 90 °, The first panel P ₁ and the fourth panel P ₄ are bent by 180 °, and the joining margin P ₅ and the first panel P ₁ connected to the side edge of the fourth panel P ₄ overlap each other. The joining margin P ₅ is bonded to the first panel P ₁ through an adhesive previously applied to the joining margin P ₅ , and a flat box A ₁ shown in FIG. 22 is formed.

As described above, the bent portion 30, the outer border is guided by the panel folding belt 38 as a first bending means and the first panel P ₁ and the fourth panel P ₄ in the first folding guide 36 l ₁ is bent by 90 ° and then 90 °, and the portion P ₆ between the outer ruled line l ₁ and the inner ruled line l _{2 is second} bent by the folding belt 41 as the second folding means. The cardboard sheet S ₁ is bent by 90 ° along the inner ruled line l ₂ guided by the guide 37 and the distance between the outer ruled line l ₁ and the inner ruled line l ₂ is substantially equal to the thickness of the cardboard sheet S _1. Thus, the cardboard sheet S ₁ can be folded along the outer ruled line l ₁ and the inner ruled line l ₂ with extremely high accuracy.

For this reason, it is possible to obtain a flat box A ₁ with high bending accuracy in which the overlapping width of the first panel P ₁ and the joint allowance P ₅ is constant, and by opening the box A ₁ , a true square is obtained. Corrugated cardboard boxes with high dimensional accuracy can be obtained.

Here, when the cardboard sheet S ₁ is transported, the pressing claw 44 of the claw-conveying belt 43 is engaged with the trailing edge of the cardboard sheet S _{1 in} the transport direction, and the cardboard sheet S ₁ is pressed and moved by the pressing claw 44. Thus, the corrugated cardboard sheet S ₁ can be reliably conveyed, and the first panel P ₁ and the fourth panel P ₄ are connected to the first vertical ruled line a ₁ and the third vertical ruled line by the panel folding belt 38 and the folding bar 40. It can be reliably bent along a ₃ with high accuracy.

In the folding part 30 as described above, the first panel P ₁ and the fourth panel P ₄ are bent in contact with the fixed folding bar 40, so that the frictional resistance acting on the contact part with the folding bar 40 is affected. As shown in FIG. 16 (I), the first panel P ₁ and the fourth panel P ₄ are relatively flat, and the first panel P ₁ and the bonding allowance P ₅ are bonded to each other so that the flat box is defective. there is a possibility that the body A ₁ is formed.

To obtain a box body A ₁ of the non-defective by correcting such defects box body A _1, FIG. 1 (I), as shown in (II), correction portion on the downstream side of the bent portion 30 50 and the shaping | molding part 60 are provided in order.

As shown in FIGS. 14 and 15, the correction unit 50 is provided with a double-row correction belt 51 and a guide plate 52 that supports the box A ₁ below the carry-out end of the claw-conveying belt 43. A support bar 53 that supports the front end edge of the box A _{1 in} the conveyance direction is passed between the straightening belts 51 of the row, and the support bar 53 is conveyed to the front edge in the conveyance direction of the box A ₁ that is conveyed by the conveyance belt 43 with a claw. The double-row correction belt 51 is moved in the direction of the arrow in FIG. 14 in synchronization with the conveyance speed of the box A ₁ so as to be engaged, and the movement speed is made slower than the conveyance speed of the box A _1. It has become.

Now, when the flat box A ₁ is sent from the bent part 30 to the correction part 50, the front edge in the transport direction of the box A ₁ is formed by the carrier side belt 51 a on the upper side of the double-row correction belt 51 and the guide plate 52. Supported. At this time, the support bar 53 faces the front edge of the box A _1, since the moving speed of the support bar 53 is slower than the moving speed of the pushing pawl 44 for conveying the box A _1, the push pawl 44 of the support bar 53 Due to the relative speed difference, the push pawl 44 is pressed against the support bar 53 while transporting the box A ₁ , and the box A ₁ is sandwiched from the front and rear by the support bar 53.

Therefore, as shown in FIG. 16I, in the case of a defective box A ₁ in which the first panel P ₁ and the fourth panel P ₄ are relatively inclined, the box A ₁ is connected to the support bar 53. By being sandwiched by the push claws 44 from the front and rear, the inclination of the first panel P ₁ and the fourth panel P ₄ is corrected, and a non-defective box A ₁ is formed as shown in FIG. This box A ₁ is transported to the forming section 60 provided on the downstream side.

Here, the box A ₁ which is fed into the forming section 60 from the straightening unit 50, FIG. 20 as shown in (I), the lower panel (first panel P ₁ and the fourth panel P ₄₎ is the upper panel ( The second panel P ₂ and the third panel P ₃ ) are shifted to the left in the transport direction, and as shown in FIG. 21I, the lower panel is shifted to the right in the transport direction with respect to the upper panel. The molding part 60 corrects the deviation and forms a good box A ₁ .

17 to 21 show the molding part 60. The molding unit 60, and support a pair of forming belt 61 provided outside each of the pair of upper transport belt 31, a pressing belt 62 provided on the transport path of the box A _1, the lower surface of the box A ₁ And a holding belt 64 for holding the box A ₁ from above and below by the presser belt 62.

A pair of forming belt 61 is provided so that the carrier side belt 61a are opposed, the distance of the carrier side belt 61a is equal to the width dimension W of the box A ₁ shown in FIG. 22. Forming belt 61, the carrier-side belt 61a is driven to move in the same direction as the moving direction of the box A ₁ (the direction indicated by the arrow in FIG. 18).

The pair of receiving belts 63 are supported so as to be swingable about a shaft 65 provided at the carry-in end, and are individually swinged about the shaft 65 by a crank mechanism 67 using a motor 66 as a drive source. When correcting the deviation of the upper and lower panels of the box A ₁ , the pair of receiving belts 63 has an inclined arrangement in which the carry-out end is located outward from the carry-in end as indicated by a chain line in FIG. The inclination angle is adjusted by the operation of the crank mechanism 67 in accordance with the amount of displacement between the upper and lower panels of the flat box.

The presser belt 62 and the clamping belt 64 are arranged so as to clamp the joint portion of the box A ₁ from above and below, and convey the box A ₁ downstream.

In the molding unit 60 having the above-described configuration is the transport, when the box body A ₁ from correcting unit 50 comes sent, the box body A ₁ is sandwiched from above and below the presser belt 62 and the clamping belt 64 to the downstream side Is done.

Here, as shown in FIG. 20I, the lower panel (the first panel P ₁ and the fourth panel P ₄ ) is transported with respect to the upper panel (the second panel P ₂ and the third panel P ₃ ). In the case of the box A ₁ shifted to the left side, the first panel P ₁ is pushed inward by the carrier side belt 61a of the forming belt 61, and the fourth panel P ₄ is held on the right side in the conveying direction held in an inclined manner. As a result of the contact with 63, it moves outward and is pressed against the carrier side belt 61a of the forming belt 61, so that the upper panel and the lower panel are not displaced as shown in FIG.

Further, as shown in FIG. 21I, the lower panel (first panel P ₁ and fourth panel P ₄ ) is on the right side in the transport direction with respect to the upper panel (second panel P ₂ and third panel P ₃ ). In the case of the slipping box A ₁ , the fourth panel P ₄ is pushed inward by the carrier side belt 61 a of the forming belt 61, and the first panel P ₁ is held in an inclined shape on the left side in the conveying direction with the receiving belt 63. Is moved toward the outer side by being pressed against the carrier side belt 61a of the forming belt 61, and as shown in FIG. 21 (II), there is no deviation between the upper panel and the lower panel.

Thus, in the molding unit 60, it is possible to correct the lateral direction of the displacement of the upper panel and the lower panel of the box A _1, it is possible to form a very good flat box A _1.

In the embodiment, after forming the corrugated board sheet S ₁ as shown in FIG. 5 (II) by performing ruling in of vertical ruled lines a ₁ to a ₄ to corrugated sheet S ₀ in ruling insertion processing portion 20, the cardboard sheet was to send the S ₁ to the bent portion 30, to omit the ruling insertion processing unit, the corrugated board sheet S ₁ shown in FIG. 5 (II) is formed by the die cutter, the corrugated board sheet S ₁ in the hopper 2 to the stacking, may be performed folded cardboard sheet S ₁ is fed directly to the bent portion 30 from the hopper.

(I) is a plan view of a cardboard sheet folding device according to the present invention, and (II) is a front view. The front view which expands and shows the paper feeding part of the corrugated cardboard sheet folding apparatus shown in FIG. Plan view of the alignment transport unit Side view showing a part of an anvil roll and a crease roll in the crease processing section (I) is a plan view showing a cardboard sheet, (II) is a plan view showing the cardboard sheet after ruled The perspective view which shows the bending part of the folding apparatus of the cardboard sheet | seat shown in FIG. Plan view of FIG. Sectional view along VIII-VIII in FIG. Sectional view along line IX-IX in FIG. Sectional drawing along the XX line of FIG. Sectional view along line XI-XI in FIG. Sectional view along line XII-XII in FIG. The perspective view which shows a 1st bending guide and a 2nd bending guide The front view which shows the correction | amendment part of the folding apparatus of the cardboard sheet | seat shown in FIG. Plan view of FIG. (I) is a plan view showing the state of the box before correction, (II) is a plan view showing the state after correction The front view which shows the shaping | molding part of the folding apparatus of the cardboard sheet | seat shown in FIG. Plan view of FIG. Vertical side view of FIG. (I) is a longitudinal side view showing the state of the box before molding, and (II) is a longitudinal side view showing the state after molding. (I) is a longitudinal side view showing the state of the box before molding, and (II) is a longitudinal side view showing the state after molding. Perspective view of a box formed by a cardboard sheet folding device A perspective view showing a conventional cardboard sheet The perspective view of the flat box formed of the corrugated cardboard sheet of FIG. The side view which shows the state in the middle of bending of the 4th panel of the cardboard sheet | seat shown in FIG. (I) and (II) are side views showing a defective box

Explanation of symbols

S ₁ corrugated sheet P ₅ joining allowance a ₁ 1st vertical ruled line a ₂ 2nd vertical ruled line a ₃ 3rd vertical ruled line a ₄ 4th vertical ruled line l ₁ outer ruled line l ₂ inner ruled line 31 Upper conveying belt (sheet conveying device)
32 Lower conveyor belt (sheet conveyor)
36 First folding guide 37 Second folding guide 38 Panel folding belt (first folding means)
41 Folding belt (second folding means)

Claims (1)

  Corrugated cardboard with four panels divided by vertical ruled lines and a joint margin connected to the side edge of one panel, and the vertical ruled lines provided inside the panels on both sides being two parallel ruled lines The sheet is conveyed in one direction by the sheet conveying apparatus, and during the conveyance, the panels on both sides of the corrugated cardboard sheet are folded 180 ° in the opposite direction along the parallel ruled lines guided by the folding guide. In a cardboard sheet folding apparatus in which an overlapping portion of a joining margin provided on a side edge of a side panel and an overlap portion of the other side panel are bonded via an adhesive, the folding guide includes an outer ruled line of parallel ruled lines. A first folding guide that guides the folding of the inner ruled line and a second folding guide that guides the folding of the inner ruled line, and the panel folding means includes the outer ruled line along the first folding guide. First bending means for bending and second bending means for bending the inner ruled line along the second bending guide, wherein the first bending means uses the panels on both sides as the first bending guide. After bending approximately 90 ° along the outer ruled line to be guided, the second folding means bends 90 ° along the inner ruled line guided by the second folding guide at the portion between the parallel ruled lines. A cardboard sheet folding device.

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