JP5687793B1 - Crease member, crease template, crease device and cardboard sheet - Google Patents

Abstract

An object of the present invention is to provide a ruled line member capable of forming a ruled line that can be accurately folded with respect to a corrugated cardboard sheet. One end of a metal belt-like plate is used as a crease, and a rib forming recess is formed in the length direction of the crease. The rib forming recess has a straight groove 13 formed in the widthwise central portion between both side edges of the crease portion 12, and the length of the crease portion 12 between the widthwise central portion and one side edge of the crease portion 12. A plurality of first inclined grooves 14 provided at intervals in the direction, and a plurality of first inclined grooves 14 provided at intervals in the length direction of the ruled portion 12 between the central portion in the width direction of the ruled portion 12 and the other side edge. As the two inclined grooves 15, linear ribs 17 and inclined ribs 18 a and 18 b are formed on the groove bottom surface B of the ruled line L by pushing the crease 12 into the corrugated cardboard sheet A. [Selection] Figure 2

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ruled member for marking a folding ruled line on a cardboard sheet, a template having the ruled member attached thereto, a ruler, and a cardboard sheet.

  In general, there are various wave heights (core heights) of the core of the corrugated cardboard sheet, and there are cases where a single core formed in a wave shape is provided or a plurality of layers are provided. Among them, cardboard sheets that are often used include those having various thicknesses ranging from 2 mm to 8 mm. There are also various wave (stage) shapes.

  Furthermore, there are papers of various layers constituting the corrugated board sheet.

  Depending on the combination of various corrugated cores, various quality papers, etc., there are several hundred corrugated cardboard varieties with various properties.

By punching the cardboard sheet having such diverse nature, for example, when forming the blank A ₁ for cardboard boxes formed as shown in FIG. 15, punch the external shape of the blank A ₁ in the board consisting of plywood An outer punching blade is attached, and a ruled member for crease marking the vertical ruled line L ₁ and the horizontal ruled line L ₂ of the blank A ₁ is attached to the inside of the outer punching blade to form a template, A cardboard sheet is punched out by a template.

Here, vertical lines L ₁ is substantially parallel to the stage C of corrugated medium S ₂ formed into corrugated cardboard sheet A, whereas the horizontal ruled line L ₂ is perpendicular to the stage C above in the core S ₂ It extends in the direction to do.

As押罫member for putting ruffled the vertical line L ₁ and the horizontal ruled line L _2, those shown in FIG. 16 has been known. The押罫member 60, one end of the metal strip-shaped plate 61 and ruffled insertion portion 62, by crushing the corrugated portion of the corrugated medium S ₂ by forcing one side of the cardboard sheet A by its ruling insertion portion 62 groove It is as in forming the Jo of vertical ruled lines L ₁ and the horizontal ruled line L _2.

  In general, the belt-like plate 61 has a height dimension between upper and lower ends of about 20 and several mm, and the width dimension between both side portions (between both side surfaces) is 0.7 mm, 1.0 mm, 1.4 mm, There are five types: 2.0 mm and 3.0 mm. For the crease on the corrugated cardboard sheet A, three types having a width dimension of 1.4 mm, 2.0 mm and 3.0 mm are often used.

  However, a strip-shaped plate having a width of 0.7 mm to 3.5 mm is used depending on the properties of the cardboard sheet A.

By the way, in the ruled member 60 shown in FIG. 16, a ruled line having both side walls by crushing the corrugated portion of the core S ₂ by pushing one surface of the corrugated cardboard sheet A having elasticity in the thickness direction at the ruled portion 62. When forming L ₁ and L ₂ , the surface of the ruled portion 62 is smooth over the entire length, so that the clear ruled lines L ₁ and L ₂ cannot be entered, and the both side walls of the ruled lines L ₁ and L ₂ cannot be inserted. The corrugated cardboard sheet A cannot be bent with high accuracy along the bottom.

Here, the blank A ₁ shown in FIG. 15, of the three vertical lines L ₁ parallel and folded along the vertical lines L ₁ 2 This either side of, is formed continuously on one side the panel P ₁ A flat box is formed by overlapping the edge portion of the panel P ₄ on the other side with the margin P ₅ and bonding the overlapping portion. At this time, if the folding precision in the vertical lines L ₁ is poor, or occur relative slope on one side of the panel P ₁ and the other side panel P _4, because the required dimensions between vertical lines is not obtained It is not possible to form a flat box with high accuracy, and when the box is opened in a square tube shape, the side walls and end walls are inclined, and a distorted box that does not have the required internal dimensions is formed. , Become a defective product.

  In order to eliminate such inconvenience, the present applicant has proposed a ruled line member that forms a ruled line that can be folded with high accuracy in Patent Document 1 and Patent Document 2.

  Here, in the ruled line member described in Patent Document 1, one end of the metal belt-like plate is used as a crease, and the depth of the crease is shorter than the thickness of the cardboard sheet. The cutouts having a square planar shape are formed at an equal pitch.

  On the other hand, in Patent Document 2, a crease portion is provided at the center of the sheet pressing surface of the arc-shaped cross section formed on the belt-like substrate, and notches are provided at intervals in the length direction of the crease portion. .

  In any of the above-described ruled members, by pushing the corrugated cardboard sheet at the crease portion and crushing the corrugated portion of the core, the pushing amount is reduced at each of the projections having a rectangular planar shape formed between the notches. Because there are many, the corrugated cardboard sheet is pushed in strongly, each concave groove has a rectangular deep groove, and the amount of pushing in the notch is small, so it becomes a convex rib at a position corresponding to the notch. The rectangular shallow groove portions are formed, and the deep groove portions and the shallow groove portions are alternately arranged on one surface of the corrugated cardboard sheet, and groove-like ruled lines having a width are formed between the opposing side walls.

  At this time, the shallow groove portion linearly intersects in the length direction of the ruled line at the height position of the middle portion of each side wall, and the deep groove portion intersects at the position of the bottom portion of each side wall. In this state, the lines are alternately arranged in the length direction of the ruled line.

  As described above, the rib formed on the bottom surface of the groove acts to prevent the side wall facing the ruled line from collapsing, so that the corrugated cardboard sheet is placed along the linear intersection of the side wall facing the ruled line and the bottom surface of the groove. Improvements have been made so that it can be folded.

JP 2000-289124 A JP 2001-239598 A

However, in the above-described ruled member, ribs formed on the bottom surface of the ruled line groove are transverse ribs extending to both side walls perpendicular to the length direction of the ruled line, and are formed at intervals in the length direction of the ruled line. Therefore, the groove bottom surface of the ruled line has high rigidity at the position where the horizontal rib is formed, and the rigidity between adjacent horizontal ribs is low, and the rigidity in the length direction of the groove bottom surface becomes non-uniform.

  Further, in addition to the above-mentioned various specific properties, the corrugated cardboard sheet has a property that the material is a paper with low rigidity and the core has a wave-shaped structure. There is a problem that it becomes unstable and cannot be bent accurately along the intersecting portion of the side wall and the groove bottom face where the ruled line is opposed.

  In particular, when the ruled line is formed in a direction parallel to the step of the center core, it depends on where the height position of the corrugated shape of the center core is crushed by the ruled member. The shape to be crushed is not constant. This phenomenon is also caused by the varieties of cores and the wave shape.

  In addition, if the degree of parallelism between the step direction of the core and the ruled member is out of order, the above phenomenon becomes more prominent, and the corrugated cardboard sheet cannot be bent accurately, and this problem needs to be solved.

  Furthermore, the linear intersections between the long side portions of the horizontal ribs (shallow groove portions) having a rectangular planar shape and the side walls of the ruled lines are the long side portions of the deep groove portions having the rectangular planar shape and the ruled lines. Since it is formed long with a step at a position higher than the linear intersection with each side wall, the ruled line cannot be bent while maintaining an accurate groove width.

  Furthermore, it is difficult to form uniform uniform ruled lines for hundreds of cardboard sheets having various properties.

  The object of the present invention is to use various kinds of paper made of low-strength paper with low rigidity as much as possible without being affected by the corrugation of the core even in the direction parallel to the center step. Corrugated sheet member, template, crease device, and corrugated cardboard with good bendability, capable of forming a ruled line that can be accurately folded while maintaining an accurate groove width for corrugated cardboard sheets having various properties Is to provide a sheet.

  In order to solve the above-described problems, in the ruled member according to the present invention, one end of a metal strip is formed as a crease, and a rib forming recess is formed in the crease, and the corrugated cardboard sheet is In the ruled member for forming a groove-shaped folding ruled line having ribs on the groove bottom surface by pressing the ruled part, the rib forming recess is formed in the center in the width direction between both side edges of the ruled part. A linear groove extending in the length direction of the crease section, and a plurality of first inclined grooves provided at intervals in the length direction of the crease section between the width direction center and one side edge of the crease section. A configuration is adopted in which a plurality of second inclined grooves are provided between the center portion in the width direction of the crease portion and the other side edge at intervals in the length direction of the crease portion.

  As described above, the straight inclined groove and the first inclined groove and the first groove in the width direction center portion of the ruled portion are spaced apart from each other between the width direction center portion and one side edge and between the width direction center portion and the other side edge. By providing the two inclined grooves, when the crease line is pressed against the corrugated cardboard sheet to form a ruled line, a linear rib is formed on the groove bottom surface of the ruled line at a portion corresponding to the linear groove, and the first inclined groove and the second An inclined rib is formed at a portion corresponding to the two inclined grooves.

  At this time, the inclined rib acts as a stick rod that prevents the side walls of the ruled line from falling inward, and the inclined rib is formed at intervals over the entire length in the length direction of the ruled line. The rigidity can be increased over the entire length and width of the groove bottom surface of the corrugated cardboard sheet made of paper with low strength and low strength.

  In addition, both sides of the linear rib formed at the center in the width direction of the bottom surface of the ruled line groove are strongly pressed when the linear rib is formed, so the strength is weak, and the weak part is the length of the ruled line. Since the corrugated sheet is bent along the ruled line, the corrugated sheet is linearly formed in two length directions, that is, each bottom part of the opposite side wall of the ruled line and both side parts of the groove bottom surface. It is possible to bend accurately with the intersection as a starting point, and bend with high accuracy without being affected by the corrugation of the core.

  Here, as the ruled member, a sheet pressing surface is provided on the surface of the belt-shaped substrate that is high at the center in the width direction and gradually decreases as it reaches both sides, and the length of the belt-shaped substrate is provided at the center in the width direction of the sheet pressing surface. The groove bottom is provided by forming a plurality of crease depressions extending in the direction, continuously forming a plurality of rib forming recesses at a constant pitch over the length direction of the crease, and pressing the crease into the corrugated cardboard sheet. Conventionally, a groove-like folding ruled line having ribs is formed, and crushing parts are formed on both sides of the ruled line.

  In the crease member as described above, the rib forming concave portion is formed in the central portion in the width direction of the crease portion and extends in the length direction of the crease portion, and the central portion in the width direction of the crease portion. And a plurality of first inclined grooves provided at intervals in the length direction of the crease portion between one side edge, and the length direction of the crease portion between the center portion in the width direction of the crease portion and the other side edge. As the plurality of second inclined grooves provided at intervals, linear ribs are formed by the linear grooves, and inclined ribs are formed by the first inclined grooves and the second inclined grooves.

Here, the first inclined groove and the second inclined groove that are formed at intervals in the length direction of the crease portion are connected to each other at the inner ends located at the center portion in the width direction of the crease portion as opposite inclinations. By forming a V-shaped groove having a flat V-shape, the V-shaped grooves are formed at intervals in the length direction of the ruled portion , and adjacent V-shaped grooves are not in contact with each other. V-shaped ribs can be formed on the bottom surface at intervals in the length direction so that adjacent V-shaped ribs do not touch each other , enhancing the function as a sticking bar, and corrugated sheet along the ruled line It can be bent more accurately.

In this case, V-shaped ribs having different orientations can be alternately formed by making the V-shaped grooves opposite to the adjacent V-shaped grooves. For this reason, the function as a stick stick can be further enhanced, and the corrugated cardboard sheet can be folded along the ruled line with higher accuracy.

  Here, when the intersecting angle α in the length direction of the ruled portion of the first inclined groove and the second inclined groove forming the V-shaped groove of the ruled portion becomes smaller than necessary, the cardboard sheet is formed. The length of the V-shaped rib is increased, the rigidity is lowered, the strength of the bottom surface of the formed ruled line is uneven in both the length direction and the width direction, and the bending position is uneven. Accuracy is reduced. Further, if it becomes larger than necessary, the length between both end portions of the V-shaped rib to be molded is shortened and the bendability is hindered. The range is 20 ° to 150 °, and more preferably 40 ° to 120 °.

  In addition, the V-shaped groove of the crease portion is formed between the opposing portions of the two V-shaped ribs formed on the cardboard sheet when an unnecessarily large space is formed between the two opposing V-shaped grooves. A large space is generated, and the rigidity of the groove bottom surface in the ruled line becomes non-uniform in the length direction, resulting in variations in the bending position, and the bending accuracy is lowered. For this reason, it is preferable that the interval between the two V-shaped grooves facing each other is 20 mm or less.

  In each of the above-mentioned ruled members, if the width dimension of the crease part becomes larger than necessary, the width dimension of the ruled line becomes large and the folding position cannot be specified, so that it is not possible to perform the folding with high accuracy. Therefore, it is preferable that the width dimension W of the ruled portion is smaller than the thickness T of the cardboard sheet (W <T).

  In the crease template according to the present invention, in the crease template for attaching a crease member to a board made of plywood, and forming a groove-like crease ruled line on the corrugated cardboard sheet by pressing the crease member, The ruled member according to the present invention is employed as the ruled member.

  Further, in the crease device according to the present invention, the template provided facing the receiving plate includes a board made of plywood and a ruled member attached to the board, and the template and the receiving plate In the crease forming apparatus for forming a groove-like folding ruled line by pressing the corrugated cardboard sheet supported by the crease member by the crease member, the crease template according to the present invention is used as the template. Was adopted.

  Furthermore, in the crease device according to the present invention, a template is attached to the outer periphery of the die roll provided to the anvil roll, and the template is a cylindrical board made of plywood and a ruled member attached to the board. In the crease forming apparatus for forming a groove-like folding ruled line on a corrugated cardboard sheet fed between both rolls by the crease member, the aforementioned crease member according to the present invention is adopted as the crease member. It was.

Further, in the crease device according to the present invention, the receiving roll and the crease roll are rotated relatively in the opposite directions, and an annular crease ridge provided on the outer periphery of the crease roll is used between the two rolls. In the crease forming apparatus for forming a groove-like folding ruled line in the corrugated cardboard sheet fed into the crease ridge, a rib forming recess is provided over the entire length of the crease on the outer periphery of the crease ridge. An arc-shaped groove formed at the center in the width direction between both side edges of the crease portion and extending in the circumferential direction of the crease portion, and the periphery of the crease portion between the width direction center portion and one side edge of the crease portion. A plurality of first inclined grooves provided at intervals in the direction, and a plurality of second inclinations provided at intervals in the length direction of the ruled portion between the widthwise central portion and the other side edge of the ruled portion. possess a groove, said second inclined to the first inclined groove However, a flat V-shaped groove is formed in which the inner ends located at the center in the width direction of the ruled part are connected to each other, and the V-shaped groove is the length direction of the ruled part. In other words, a configuration in which the adjacent V-shaped grooves are not in contact with each other is employed.

Further, in the corrugated cardboard sheet according to the present invention, in the corrugated cardboard sheet in which a groove-shaped folding ruled line having a pair of side walls and a groove bottom face is formed, a linear rib at the center in the width direction of the groove bottom face, A first inclined rib formed between the central portion in the width direction of the groove bottom surface and one side wall with an interval in the length direction of the ruled line, and in the length direction of the ruled line between the central portion in the width direction of the groove bottom surface and the other side wall. only set a second inclined ribs formed in plurality at intervals, said first inclined rib and the second inclined ribs are inclined in opposite directions among located in the central portion in the width direction of the ruled line A flat V-shaped rib whose ends are connected to each other is formed, the V-shaped ribs are formed at intervals in the length direction of the ruled line, and the adjacent V-shaped ribs are not in contact with each other .

In the present invention, for a corrugated cardboard sheet having various and unique properties made of paper having low rigidity and low strength, a linear rib parallel to the side wall at the center between two opposing side walls, and two A flat V-shaped rib inclined with respect to the linear rib is formed between the side walls on the groove bottom surface, and the V-shaped ribs are formed at intervals in the length direction of the ruled line. Since it is configured so as not to contact, a groove-like ruled line with high rigidity at the bottom of the groove can be obtained, and the two opposite side walls of the ruled line can be obtained without being affected by the corrugated shape of the core. It can be bent very accurately starting from the linear bottom.

(I) is a longitudinal sectional view of a crease forming apparatus according to the present invention, (II) is a longitudinal sectional view showing a state at the time of crease, and (III) is a sectional view of a corrugated cardboard sheet. Plan view of a ruled member according to the present invention Partially cutaway front view of FIG. Sectional view along line IV-IV in FIG. The perspective view which shows a part of cardboard sheet | seat based on this invention Plan view of FIG. (A) thru | or (g) is a schematic diagram which shows the other example of the recessed part for rib shaping | molding. (A) thru | or (d) is a schematic diagram which shows the further another example of the recessed part for rib shaping | molding. (A) thru | or (d) is a schematic diagram which shows the further another example of the recessed part for rib shaping | molding. (I) is a perspective view showing still another example of the ruled member according to the present invention, and (II) is a sectional view thereof. (I) is a longitudinal sectional view showing another example of the crease forming apparatus according to the present invention, and (II) is a perspective view showing a part of the crease member. (I) is a front view showing still another example of a crease forming apparatus according to the present invention, (II) is a side view, and (III) is a perspective view showing a part of a crease roll. (A) thru | or (i) is a schematic diagram which shows the reference example of the recessed part for rib shaping | molding (A) thru | or (g) is a schematic diagram which shows the reference example of the recessed part for rib shaping | molding Partially cutaway front view showing a blank for forming a cardboard box A perspective view showing a conventional ruled member

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a scoring device for scoring cardboard sheets. The ruler includes a flat plate-shaped receiving plate 1 that supports the corrugated cardboard sheet A, and a template 2 that can be moved forward and backward with respect to the receiving plate 1. The template 2 is made of veneer plywood. A ruled attachment groove 4 is formed in the flat board 3 formed by laser processing or the like, and a ruled member 10 is press-fitted in the height direction of the ruled attachment groove 4.

As shown in FIGS. 2 to 4, in this embodiment, according to the properties of the corrugated cardboard sheet A, the ruled member 10 has a height dimension between upper and lower ends of about 20 and several millimeters, width W ₁ of both side to side) is a 0.7Mm～3.5Mm, length is made of a metallic strip-shaped plate 11 which is the appropriate size, one end portion is ruled of above and below the strip-shaped plate 11 The insertion portion 12 is used.

  The ruled part 12 is a flat surface with rounded sides, but may be arcuate. The ruled portion 12 is formed with a straight groove 13 as a rib forming recess, and a first inclined groove 14 and a second inclined groove 15 as rib forming recesses.

  The straight groove 13 is provided in the middle portion in the width direction between both side edges of the ruled portion 12 so as to extend in the length direction, leaving the protruding portions 13a on both sides. The straight groove 13 is a discontinuous groove provided in a straight line at intervals in the length direction of the ruled portion 12.

The first inclined groove 14 is alternately inclined in the opposite direction with the same gradient linearly between the center portion in the width direction of the crease portion 12 and one side edge, and is spaced in the length direction of the crease portion 12. A plurality of them are provided without crossing each other. On the other hand, the second inclined groove 15 is alternately inclined in the opposite direction with the same gradient linearly between the center portion in the width direction of the crease portion 12 and the other side edge, and is spaced in the length direction of the crease portion 12. A plurality are provided without crossing each other.

  The first inclined groove 14 and the second inclined groove 15 are provided to be inclined in opposite directions at opposite positions so as to be symmetrical with respect to the central portion in the width direction of the crease portion 12, and are inclined in the opposite directions. The first inclined groove 14 and the second inclined groove 15 that are opposed to each other are connected to each other at the inner ends located at the center in the width direction of the ruled part 12. A sharp portion 16a is formed by the connection of the inner ends, and the first inclined groove 14 and the second inclined groove 15 become a horizontal V-shaped groove 16 having a flat V shape.

The V-shaped grooves 16 are formed between the adjacent linear grooves 13 so as to form a pair between the discontinuous linear grooves 13, and are formed so that each pair of sharp portions 16a face each other. ing.

The V-shaped groove 16 is preferably symmetric with respect to the center in the width direction, but the sharp portion 16a does not necessarily need to be positioned in the center in the width direction as long as it is positioned between both side edges of the ruled portion 12. In addition, the inclination angles of the first inclined groove 14 and the second inclined groove 15 may be different. As long as the linear groove 13, the first inclined groove 14, and the second inclined groove 15 are linear, the groove may be intermittently interrupted. Further , the first inclined groove 14 and the second inclined groove 15 may be gently curved.

The linear groove 13 and the V-shaped groove 16 may be formed by press molding, or may be formed by cutting. The crossing angle α between the first inclined groove 14 and the second inclined groove 15 forming the V-shaped groove 16 is in the range of 20 ° to 150 °. Further, the V-shaped groove 16 is continuously formed in the length direction of the ruled portion 12 so that a constant interval δ ₁ of 20.0 mm or less is opened between the adjacent V-shaped grooves 16. However, each interval may be a different pitch.

  Furthermore, the first inclined groove 14 and the second inclined groove 15 that form the linear groove 13 and the V-shaped groove 16 are V-shaped in cross section, but the cross-sectional shape is arbitrary, and is round. Or a square groove.

In the crease device having the above configuration, as shown in FIG. 1 (I), the corrugated sheet A is supported by the receiving plate 1 provided facing the lower side of the template 2, and the receiving plate 1 and the template 2 are supported. When the template 2 is lowered with respect to the receiving plate 1 so as to approach, the ruled portion 12 of the ruled member 10 pushes one surface of the corrugated cardboard sheet A, as shown in FIG. since crushing the core S _2, linear as borders L having a pair of side walls S and the groove bottom B facing the cardboard sheet a has the same width as the width dimension W ₁ of押罫member 10 and grooved Formed.

  At this time, the ruled part 12 is formed with the straight groove 13, and the V-shaped groove 16 composed of the first inclined groove 14 and the second inclined groove 15, so as shown in FIGS. On the groove bottom surface B of the ruled line L, linear ribs 17 are formed at portions corresponding to the linear grooves 13.

  In addition, the first inclined rib 18a formed in the portion corresponding to the V-shaped groove 16 with a space in the length direction of the ruled line L between the central portion in the width direction of the groove bottom surface B and the one side wall S, and the groove A plane V-shape having the same crossing angle α as the crossing angle α is formed by the second inclined ribs 18b formed in the lengthwise direction of the ruled line L between the central portion in the width direction of the bottom surface B and the other side wall S. The ribs 18 are continuously formed at intervals in the length direction without interruption in a state where the ribs 18 protrude over the side walls S.

  Each V-shaped rib 18 intersects each side wall at the height position of the intermediate portion of each side wall S, but the intersection is a straight line that is short in the length direction of the ruled line L.

  In this way, since the V-shaped ribs 18 across the side walls S are continuously formed in the length direction of the ruled line L, the groove bottom surface B of the corrugated cardboard sheet A made of paper having low rigidity and low strength is used. Thus, the rigidity in the entire length direction and the width direction can be increased to prevent bending at the intermediate portion in the width direction of the groove bottom surface B, and the V-shaped ribs 18 prevent the side walls S from falling inward. It functions as a stick.

In addition, the linear groove 13 of the ruled part 12 forms a linear rib 17 extending in the length direction between the V-shaped ribs 18 facing each other at the center in the width direction of the groove bottom surface B of the ruled line L. The central portion in the width direction is linearly increased in rigidity, and the protruding portions 13a of the ruled portion 12 push the both side portions of the linear rib 17 strongly when the linear rib 17 is formed. weakly, since the weak portion of the intensity is continuously formed in the longitudinal direction of the ruled line L, when bending the corrugated cardboard sheet a along the border L, without being affected by the corrugated medium S ₂ of corrugated Further, the cardboard sheet A does not bend at the intermediate portion in the width direction of the ruled line L, and the corrugated sheet A has two linear crossing portions in the two length directions, that is, each bottom portion of the opposing side wall S of the ruled line L and both side portions of the groove bottom surface B. Bends accurately as a starting point, high accuracy It can be bent.

  Here, when the crossing angle α between the first inclined groove 14 and the second inclined groove 15 forming the V-shaped groove 16 shown in FIG. 2 becomes smaller than necessary, the length of the V-shaped rib 18 to be formed becomes longer. Thus, the rigidity of the bottom surface of the groove of the ruled line L is weakened, the function as a sticking rod is lowered, and the rigidity of the bottom surface B of the ruled line L of the ruled line L is uneven in both the length direction and the width direction. The bending position varies and the bending accuracy decreases. On the other hand, if it becomes larger than necessary, the length 1 between both ends of the V-shaped rib 18 to be molded is shortened and the bendability is hindered. Accordingly, the crossing angle α is limited to 20 ° to 150 ° in consideration of various properties of the cardboard sheet A, but more preferably 40 ° to 120 °.

  It is preferable to increase the crossing angle α as the thickness of the corrugated cardboard sheet A increases.

Further, when an unnecessarily large space is formed between the two V-shaped grooves 16 facing each other, the V-shaped groove 16 has a large space δ ₁ between the facing portions of the two V-shaped ribs 18 to be molded. As a result, the rigidity of the groove bottom surface B in the ruled line L becomes non-uniform in the length direction, resulting in variations in the folding position and lowering the folding accuracy. Therefore, it is preferable to make this gap [delta] ₁ and 20mm or less.

In consideration of the nature of the cardboard sheet A, better to reduce the extent interval [delta] ₁ small cardboard sheet A of thickness is more preferable.

As described above, in consideration of various properties of the corrugated cardboard sheet A, the intersecting angle α of the first inclined groove 14 and the second inclined groove 15 forming the V-shaped groove 16 is in a range of 20 ° to 150 °, Further, since the interval δ ₁ between the two V-shaped grooves 16 facing each other is 20.0 mm or less, a highly rigid groove bottom surface B can be formed over the entire length direction and width direction, and the accuracy is high. It can be bent.

Here, the width _{W 1} between both side portions of the metallic strip-shaped plate 11 which forms a押罫member 10 for cardboard sheet A (between both sides) is 0.7～3.5Mm, of the cardboard sheet A The belt-like plate 11 having an appropriate width dimension is used according to the properties such as the thickness. As shown in FIG. 1 (I), when the thickness of the corrugated cardboard sheet A is T, the belt-like plate 11 is used that satisfies the relationship of W ₁ <T.

Since the cardboard sheet A has various properties, the width dimension W ₁ of the strip-shaped plate 11 is greater than necessary width of larger than the thickness T of the cardboard sheet A, borders L formed, The folding position cannot be specified, so that the folding cannot be performed with high accuracy, and when the corrugated cardboard sheet A is folded into a box, the inner dimensions thereof are not constant. Therefore, it is preferable to have a relationship of W ₁ <T.

Here, in the ruled member 10 shown in FIG. 2, an interval δ ₂ of about 5.0 mm is provided between both ends of the linear groove 13 and the V-shaped groove 16. For this reason, an interval δ _{2 of} about 5.0 mm is formed between the end portions of the V-shaped rib 18 and the linear rib 17.

The distance [delta] ₂ formed between the end portions of the V-shaped groove 16 of the linear groove 13 is not limited to 5mm, compatible with the nature of the cardboard sheet A long 5mm or less. The length of 5.0 mm or less may include a negative value, and may be a length such that the linear groove 13 bites inward from the end of the V-shaped groove 16.

In FIG. 2, the rib forming recesses are spaced apart in the length direction of the crease portion 12, and the discontinuous linear grooves 13 formed by leaving the protruding portions 13 a on both sides, and the adjacent linear grooves 13. Although what consists of a pair of V-shaped groove | channel 16 from which a different direction was formed was shown, it is not limited to this.

FIGS. 7A to 7G schematically show other examples of the rib forming recesses. In any of these examples, the V-shaped groove 16 (hereinafter referred to as “left-facing V-shaped groove 16”) having the sharp portion 16a facing left and the V-shaped groove 16 having the sharp portion 16a facing right (hereinafter referred to as “right-facing V”). Are formed alternately with intervals in the length direction of the crease portion so as not to cross each other, and further, the linear grooves 13 are formed so as to leave the protruding portions 13a on both sides at the center in the width direction. Provided. In (a), the linear groove | channel 13 is provided in the space | interval between each rightward V-shaped groove | channel 16 and leftward V-shaped groove | channel 16 which adjoin each other.
In (b), a straight groove is spaced between each adjacent rightward V-shaped groove 16 and leftward V-shaped groove 16 and between each adjacent leftward V-shaped groove 16 and rightward V-shaped groove 16. 13 is provided.
In (c), the sharpened portions 16a of the right-facing V-shaped groove 16 and the left-facing V-shaped groove 16 are provided at the central portion in the length direction of each linear groove 13 provided at an interval.
In (d), the adjacent rightward V-shaped groove 16 and leftward V-shaped groove 16 are paired, and the pair of V-shaped grooves 16 are integrally provided on the linear groove 13.
In (e), a straight groove 13 is provided between the left-facing V-shaped groove 16 and the right-facing V-shaped groove 16 adjacent thereto, and the sharp portions 16a of the respective V-shaped grooves 16 are formed at both ends of the straight groove 13. To be located.
In (f), a straight groove 13 is provided inside each of the adjacent rightward V-shaped groove 16 and leftward V-shaped groove 16, and the rightward V-shaped groove 16 is positioned at one end of the straight groove 13, left V-shaped groove 16 adjacent opening the are to be positioned at the other end of the linear groove 13 adjacent spaced.
In (g), the straight groove 13 is a single straight groove extending continuously in the length direction of the ruled portion across the sharpened portions 16a of all the V-shaped grooves 16.

  2 and 7, the right-facing V-shaped groove 16 and the left-facing V-shaped groove 16 are alternately provided in the length direction of the ruled portion, but as shown in FIGS. 8A to 8D. The V-shaped groove 16 may be oriented in the same direction, or, as shown in FIGS. 9A to 9D, each of the right-facing V-shaped groove 16 and the left-facing V-shaped groove 16 is formed. One unit is a plurality, and the rightward V-shaped groove 16 and the leftward V-shaped groove 16 of one unit are alternately arranged at intervals in the length direction of the ruled portion so as not to cross each other. May be.

Incidentally shown in FIG. 8 (a) to (c) and FIG. 9 (a) to (c) includes a plurality of V-shaped grooves 16 a continuous spaced, the plurality of straight grooves 13 consecutive spaced 8 (d) and 9 (d) show examples of the positional relationship. In FIG. 8 (d) and FIG. 9 (d), the straight grooves 13 cross all the sharp portions 16a of the V-shaped grooves 16, and continue in the length direction of the ruled portion. An example of a single straight groove extending in the direction is shown.

10 (I) and (II) show still another example of the ruled member. The ruled member 20 is provided with a shallow groove 23 at the center in the width direction of a flat mounting surface 22 formed on the back surface of the belt-like substrate 21. Further, a sheet pressing surface 24 is formed on the surface of the band-shaped substrate 21 so that the central portion in the width direction of the band-shaped substrate 21 is thick, and the thickness is gradually reduced toward both sides. the ridge 25 having a width W ₂ of Ru elongated in the longitudinal direction of the belt-shaped substrate 21 provided in parts, is provided with a recess for the ribs forming over the entire length of the crease insertion portion 12 of the top surface of the projection 25.

  Here, since the rib forming recess is the same as the rib forming recess shown in FIGS. 2 to 3, the same portions are denoted by the same reference numerals and description thereof is omitted.

A corrugated sheet 20 is formed by attaching the ruled member 20 having the above structure to the template 2 of the creasing apparatus shown in FIG. One side of A is pushed by the sheet pressing surface 24, and as shown in FIG. 10 (II), a crushed portion b of the corrugated cardboard sheet A is formed which is deep at the center in the width direction and gradually becomes shallower as it reaches both sides. The width direction central portion of the crushed portion b is pushed by the long protrusion 25, ruled line L having the same width W ₂ and ridges 25 are formed in a linear shape.

  At this time, since the linear groove 13 and the V-shaped groove 16 with the protruding portions 13a remaining on both sides are continuously formed on the protrusion 25, the groove bottom surface B of the ruled line L is shown in FIGS. Linear ribs 17 and V-shaped ribs 18 whose sides are crushed are continuously formed.

  As shown in FIG. 10 (II), the cardboard sheet A is crushed by the sheet pressing surface 24, and the ruled line L is creased in the crushed portion b, thereby forming the crease without causing the liner to crack. Can do.

  Further, since both sides of the ruled line L of the corrugated cardboard sheet A are crushed and thinned by the crushing part b, when the cardboard sheet A is folded 180 degrees along the ruled line L, the both side parts hit each other and bend. Can be prevented.

  Furthermore, since the linear rib 17 and the V-shaped rib 18 shown in FIGS. 5 and 6 can be formed on the groove bottom surface, a highly rigid groove bottom surface B is formed, and FIG. 5 and FIG. Similarly to the case shown, the corrugated board sheet A can be accurately folded along a pair of linear intersections between the groove bottom surface B and both side surfaces.

Also in this embodiment, the width W ₂ of the ruling insertion portion, the relationship between the thickness T of the cardboard sheet, since it is a W 2 _<T, it is possible to bend with high accuracy specified bending position, the inner Boxes with constant dimensions can be manufactured.

  10 (I) and 10 (II) show the rib forming recesses including the straight grooves 13 and the V-shaped grooves 16 shown in FIG. 2, but the rib forming recesses shown in FIGS. 7 to 9 are provided. May be.

  FIG. 11 shows a ruled punching device. In this apparatus, a template 32 is attached to the outer periphery of a die roll 31 facing the anvil roll 30, and the corrugated sheet A fed between the anvil roll 30 and the die roll 31 rotating in opposite directions forms an arc shape. The punching blade 34 attached to the board 33 is used for punching into a predetermined shape, and the cardboard sheet A is creased by the ruled member 40 attached to the board 33.

Here,押罫member 40 which forms a border to the transport direction of the cardboard sheet A, as shown in FIG. 11 (II), the end face of the outer diameter side of the arcuate metal strip-shaped plate 41 and the ruling insertion portion 12 In addition, a rib-forming recess made up of a straight groove 13 and a V-shaped groove 16 is provided continuously on the outer periphery of the ruled portion 12 so as to leave the protruding portions 13a on both sides shown in FIGS.

  By ruled the corrugated cardboard sheet A by the ruled member 40, the ruled lines L shown in FIGS. 5 and 6 can be formed in a linear shape.

In addition, by using the ruled member 40, the crease portion 12 to be creased has a large number of irregularities, so that the engaging force with the corrugated cardboard sheet A is strong, and the slippage between the ruled sheet member 40 and the corrugated cardboard sheet A is strong. Can be prevented, and punching and ruled with high dimensional accuracy can be performed.

  12 (I) and (II) show another example of a ruler. In this example, a pair of rotary shafts 51 and 52 that rotate in opposite directions are provided on the downstream side of the pair of upper and lower feed rollers 50 that feed the cardboard sheet A in the direction of the arrow in FIG. A crease roll 53 as a crease member is attached, and a receiving roll 54 is attached to the lower rotary shaft 52.

Further, a ridge 55 for crease is provided on the outer periphery of the crease roll 53, and the crease portion 12 on the outer periphery of the ridge 55 is provided on both sides as rib forming recesses as shown in FIG. An arcuate groove 13 corresponding to the linear groove 13 leaving the protruding portion 13a and a V-shaped groove 16 composed of the first inclined groove 14 and the second inclined groove 15 are continuously provided at intervals in the circumferential direction.

  When the corrugated sheet A is fed between the ruler roll 53 and the receiving roll 54 that rotate in the direction of the arrow in FIG. 5 and 6 can be formed on the cardboard sheet A, and the cardboard sheet A can be accurately folded along the ruled line L. .

In the example shown in FIGS. 2 and 7 to 9, the first inclined groove 14 and the second inclined groove 15 are opposed to each other in the width direction of the ruled portion 12, and the pair of first inclined grooves 14 and the second opposed to each other. Although the inclined groove 15 is inclined in the opposite direction to form the V-shaped groove 16 having the pointed portion 16a by the connection at the inner end, in the reference example shown in FIGS. The groove 14 and the second inclined groove 15 are inclined in the same direction with the same gradient, and the inner ends located at the center in the width direction of the ruled portion 12 are connected to each other to form a linear inclined groove 19. They are formed at intervals in the longitudinal direction of the ruling insertion portion 12. Also in this example, a straight groove 13 is provided in the center of the ruled portion 12 in the width direction, leaving the protruding portions 13a on both sides.

  In this case, as shown in FIGS. 13A to 13C, a large number of linear inclined grooves 19 that are inclined in the same direction may be formed at intervals in the length direction of the ruled portion 12, As shown in FIGS. 13D to 13F, linear inclined grooves 19 inclined in opposite directions may be alternately provided in the longitudinal direction of the ruled portion. Further, as shown in FIGS. 13 (g) to (i), a plurality of linear inclined grooves 19 having different inclination directions may be alternately provided in the length direction of the ruled portion 12 as a unit. Good.

Furthermore, FIG. 14 shows another reference example. In this example, as shown in FIGS. 14A to 14D , the first inclined groove 14 and the second inclined groove 15 are inclined in opposite directions and spaced from each other in the length direction of the ruled portion 12. open it and be provided alternately. In this case, the straight groove 13 leaving the protruding portions 13a on both sides of the center portion in the width direction of the ruled portion 12 is formed by the first inclined groove 14 and the second inclined groove as shown in FIGS. 14 (a) to 14 (c). The grooves 15 may be discontinuous joined to each of the grooves 15 or may be a single continuous one extending in the length direction of the ruled portion 12 as shown in FIG. May be.

  Further, as shown in FIG. 14E, the first inclined groove 14 and the second inclined groove 15 are spaced apart from each other in the length direction of the ruled portion 12 with a plurality of the inclined portions in the same direction as one unit. As shown in FIG. 14F, a plurality of first inclined grooves 14 having different inclination directions are used as one unit, and a plurality of second inclined grooves 15 having different inclination directions are used as one unit. As an alternative, the units may be provided alternately at intervals in the length direction of the ruled portion 12.

  Further, as shown in FIG. 14 (g), the first inclined groove 14 and the second inclined groove 15 may be provided so as to be inclined in the same direction to form a staggered arrangement. Also in the example of FIGS. 14A to 14G, the linear groove 13 is formed leaving the protruding portions 13a on both sides.

  7 (a) to (g), FIGS. 8 (a) to (d), FIGS. 9 (a) to (d), FIGS. 13 (a) to (i), and FIGS. 14 (a) to (g). Also in the case of the example, as long as the linear groove 13, the first inclined groove 14, and the second inclined groove 15 are linear, the groove may be intermittently slightly interrupted.

  Further, the first inclined groove 14 and the second inclined groove 15 may be gently curved.

  7 (a) to (g), FIGS. 8 (a) to (d), FIGS. 9 (a) to (d), FIGS. 13 (a) to (i), and FIGS. 14 (a) to (g). In the ruled line L formed on the corrugated cardboard sheet A in the ruled part 12 in the example, the inclined ribs extending on both side walls S by the first inclined groove 14 and the second inclined groove 15 are provided continuously in the length direction of the ruled line L. Therefore, the rigidity of the groove bottom surface B of the corrugated cardboard sheet A made of paper having low rigidity and low strength is increased over the entire length and width, and the groove bottom B is bent at the intermediate portion in the width direction. And the inclined rib functions as a stick rod that prevents the side walls S from falling inward.

Further, the linear groove 13 of the crease portion 12 forms a linear rib in the longitudinal direction at the central portion in the width direction of the groove bottom surface B of the crease line L, and linear rigidity is formed in the central portion in the width direction of the ruled line L. Further, both sides of the linear rib are strongly pushed by the protrusion 13a of the ruled portion 12 when the linear rib is formed, and the strength is weak. because it is formed continuously in the longitudinal direction, when bending the corrugated cardboard sheet a along the border L, without being affected by the corrugated medium S ₂ of corrugated, further, it bends widthwise central portion of the ruled line L The corrugated cardboard sheet A is bent accurately in the two length directions of the bottom part of the side wall S facing the ruled line L and the both side parts of the groove bottom surface B, and is bent with high accuracy. Can do.

In each embodiment of the present invention, the four end portions of the two first inclined grooves 14 and the one end portions of the two second inclined grooves 15 facing each other are in the width direction of the crease portion 12. They are provided at appropriate intervals in the length direction without contact at the center.

  Accordingly, since the area of the flat portion of the groove bottom surface B of the concave ruled line L formed by the ruled portion 12 is relatively large, the inclined rib formed by the first inclined groove 14 and the second inclined groove 15 is formed. Remarkably, the action like a sticking rod by the inclined rib becomes remarkable, and the corrugated board sheet A is accurately bent and the ruled line L is formed in a state in which the accurate groove width is maintained.

A Corrugated cardboard sheet 1 Receiving plate 2 Mold plate 3 Board 10 Ruled member 11 Strip plate 12 Ruled portion 13 Straight groove (arc-shaped groove)
13a Protruding portion 14 First inclined groove 15 Second inclined groove 16 V-shaped groove 17 Linear rib 18 V-shaped rib 18a First inclined rib 18b Second inclined rib 20 Ruled member 21 Strip substrate 24 Sheet pressing surface 25 ridge 30 anvil roll 31 die roll 32 template 33 arc-shaped board 40 ruled member 41 strip plate 53 crease roll 54 receiving roll 55 ridge

Claims (8)

One end crease insertion portion of the metallic strip-shaped plate (11) is (12), a recess ribs molded into its ruling insertion section (12), the groove by pushing the ruling insertion portion relative cardboard sheet (12) In the ruled line member (10) for forming a groove-shaped folding ruled line having ribs on the bottom surface,
The rib molding recess, the ruling insertion portion (12) straight grooves (13) formed in the widthwise central portion between both side edges in extending the length of the crease insertion portion (12) of the ruling insertion portion A plurality of first inclined grooves (14) provided at intervals in the length direction of the crease portion (12) between the width direction center portion and one side edge of the crease portion (12) ; A plurality of second inclined grooves (15) provided at intervals in the length direction of the ruled part (12) between the widthwise center part and the other side edge ;
The first inclined groove (14) and the second inclined groove (15) are inclined in opposite directions so that the inner ends located at the center in the width direction of the ruled part (12) are connected to each other. A V-shaped groove (16) is formed, and the V-shaped groove (16) is formed at an interval in the length direction of the ruled portion (12), and adjacent V-shaped grooves (16) do not contact each other. A ruled line member characterized by that. A sheet pressing surface (24) is provided on the surface of the belt-like substrate (21) which is high at the center in the width direction and gradually lowers as it reaches both sides, and the belt-like substrate (21 at the center in the width direction of the sheet pressing surface (24). ) ruling insertion unit consisting of ridges (25) extending in the longitudinal direction (12) provided in the form of ribs shaped recess at its ruffled insertion section (12), the crease-insertion unit for cardboard sheets (12) In a ruled member (20) for forming a groove-shaped folding ruled line having ribs on the groove bottom surface by pressing and forming a crushing part on both sides of the ruled line,
The rib molding recess, the ruling insertion portion (12) straight grooves (13) formed in the widthwise central portion between both side edges in extending the length of the crease insertion portion (12) of the ruling insertion portion A plurality of first inclined grooves (14) provided at intervals in the length direction of the crease portion (12) between the width direction center portion and one side edge of the crease portion (12) ; A plurality of second inclined grooves (15) provided at intervals in the length direction of the ruled part (12) between the widthwise center part and the other side edge ;
The first inclined groove (14) and the second inclined groove (15) are inclined in opposite directions so that the inner ends located at the center in the width direction of the ruled part (12) are connected to each other. A V-shaped groove (16) is formed, and the V-shaped groove (16) is formed at an interval in the length direction of the ruled portion (12), and adjacent V-shaped grooves (16) do not contact each other. A ruled line member characterized by that. The ruler member according to claim 1 or 2 , wherein the V-shaped groove (16) is opposite to an adjacent V-shaped groove (16) . Install the押罫member (10, 20) to the board (3) made of plywood, the押罫member (10, 20) ruling insertion die plate forming a folding ruler line of groove-shaped in the cardboard sheet by pushing the ( 2)
A ruled template, wherein the ruled member (10, 20) comprises the ruled member according to any one of claims 1 to 3 . The mold plate (2) provided facing the receiving plate (1) has a board (3) made of plywood and a ruled member (10, 20) attached to the board (3). A ruled line which forms a groove-like folding ruled line by pressing the corrugated sheet supported by the receiving plate (1) by the ruled member (10, 20) by the approach between the plate (2) and the receiving plate (1). In the filling device,
The ruler according to claim 4 , wherein the template (2) is the ruler template according to claim 4 . Attaching mold plate (32) on the outer periphery of the die roll which is oppositely arranged to the anvil roll (30) (31), the template (32) is arc-shaped board made of plywood (33) and the board (33) In a crease forming apparatus which has a ruled member (40) attached and forms a groove-like folding ruled line on a cardboard sheet fed between the rolls (30, 31) by the ruled member (40) ,
4. A crease forming apparatus according to claim 1 , wherein the crease member (40) comprises the crease member according to any one of claims 1 to 3 . The receiving roll (54) and the crease roll (53) rotate relatively in opposite directions, and the two rolls ( 55) are formed by an annular crease ridge (55) provided on the outer periphery of the crease roll (53). 53, 54) in a crease forming apparatus for forming a groove-like folding ruled line in a corrugated cardboard sheet fed between
A rib forming concave portion is provided in the ruled portion (12) on the outer periphery of the ruled ridge (55) , and the rib forming concave portion is formed at the center in the width direction between both side edges of the ruled portion (12). an arcuate groove extending in a circumferential direction of the formed crease insertion section (12) (13), in the circumferential direction of the ruling insertion portion (12) between the widthwise central portion and the one side edge of the crease insertion section (12) A plurality of first inclined grooves (14) provided at intervals, and a plurality of intervals in the circumferential direction of the ruled portion (12) between the central portion in the width direction of the ruled portion (12) and the other side edge. A second inclined groove (15) provided ,
The first inclined groove (14) and the second inclined groove (15) are inclined in opposite directions so that the inner ends located at the center in the width direction of the ruled part (12) are connected to each other. A V-shaped groove (16) is formed, and the V-shaped groove (16) is formed at an interval in the length direction of the ruled portion (12), and adjacent V-shaped grooves (16) do not contact each other. A crease device characterized by that. In the corrugated cardboard sheet (A) in which a groove-like folding ruled line (L) having a pair of opposing side walls (S) and a groove bottom surface (B ) is formed,
And the groove bottom surface straight rib (17) in the width direction central portion of the (B), contact intervals along the longitudinal direction of the ruled line (L) between the width direction central portion and the one side wall of the groove bottom surface (B) (S) And the second inclined rib (18a) formed between the groove bottom surface (B) and the other side wall (S) in the longitudinal direction of the ruled line (L) . An inclined rib ( 18b) ,
The first inclined rib (18a) and the second inclined rib (18b) are inclined in opposite directions, and are flat V-shaped ribs whose inner ends located at the center in the width direction of the ruled line (L) are connected to each other. (18) is formed, the V-shaped ribs (18) are formed at intervals in the length direction of the ruled line (L), and the adjacent V-shaped ribs (18) are not in contact with each other. Cardboard sheet.

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