JP6537353B2 - Paper box manufacturing method - Google Patents

Description

  The present invention relates to a method of manufacturing a paper box in which work processes such as insertion are performed by a manufacturing apparatus.

Conventionally, a paper board etc. are cut in the shape which expand | deployed the box and this is assembled and shape | molded and formed into a paper box by bending process etc. is performed. Specifically, a blank sheet integrally formed with a lid plate, a side wall, a bottom plate and the like is prepared by cutting a sheet of paper or the like, and the sheet is bent at a joint or corner to form a container. Here, the side wall formed by bending the edge portion of the bottom plate at a right angle, for example, is provided with flaps or the like on a part of the side wall, and these flaps are overlapped and joined to each other. It is fixing (for example, refer patent document 1).
Each of the above-mentioned flaps is provided, for example, with an insertion cut at the overlapping portion, and these flaps are crossed, inserted into each other's cut, and the side walls raised by engaging the flaps are displayed. Support fixed.

Unexamined-Japanese-Patent No. 10-278922 gazette

When the blank sheet is formed into a paper box, two flaps are linearly stacked to engage (insert) the above-mentioned incisions (inserts), so this insertion work is a machine operation of a manufacturing apparatus etc. It is difficult to do with this, and the assembly of this part is done manually. That is, when the paper box is formed using the engagement by insertion, it is difficult to mechanize the entire manufacturing process, and there is a problem that the time required for assembling the paper box becomes long.
When a paper box is manufactured by a machine such as a manufacturing apparatus, for example, an adhesive margin is provided on a part of the side wall, a glue or adhesive is applied to this part, and the side walls are adhered to each other. A process is provided to maintain the state. When an adhesive or the like is used as described above, depending on the type of adhesive or the like, a predetermined time is required to cure the bonded portion, and thus the assembly time of the paper box becomes long and peeling of the blank sheet surface occurs in the bonded portion. The strength drops compared to the insertion structure. In addition, since the quality control of the adhesive and the like is required, there is a problem that it is difficult to reduce the production cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a paper box manufacturing method capable of shortening the manufacturing time and suppressing the manufacturing cost by assembling the insertion portion of the paper box by a mechanical operation.

The paper box manufacturing method according to the present invention is a paper box manufacturing method for assembling a paper box by bending a predetermined position of a blank sheet, wherein the paper box is disposed vertically or substantially perpendicularly to the blank sheet and provided on the blank sheet. When the bottom plate portion is disposed on the front side with respect to the lid plate portion formed by connecting to the bottom plate portion and viewed from above, the blank sheet is substantially directed toward both ends of the blank sheet centering on the central axis in the width direction of the blank sheet. A first step of placing an inner guide, which is expanded in a C shape, on the surface of the blank sheet, and a first ear connected in series to two side wall portions provided at both ends of the blank sheet A second step of bending the flaps and the second ear flaps so that the flaps and the second ear flaps stand up from the side walls and abut on the expanded and disposed ends of the inner guide; And a third step of moving the first ear flap and the second ear flap along the inner guide by bending the side wall portion from the bottom plate to rise, and a tip end of the first ear flap by the movement And a fourth step of engaging the first ear flap tip and the second ear flap tip when the tip of the second ear flap overlaps with the second ear flap, and the third step comprises the steps of: Also, the first ear flap tip is delayed and moved toward the center of the blank sheet, and the first ear flap tip and the second ear flap tip curve respectively to form the center of the blank sheet and the inner guide. And d) moving the lower end into contact with the distal end bending guide and bending the distal end in a predetermined direction to widen the insert provided at the each distal end, The step includes crossing the tip of the first ear flap moved to the center of the blank sheet and the lower portion of the inner guide with the tip of the second ear flap in a state where the tip is bent, and crossing the tips. Engaging the stacked spread inserts.

  In the third step, the first ear flap and the second ear flap are moved between a middle guide disposed parallel to the inner guide and the inner guide; When the tip of the tip and the tip of the second ear flap move between the inner guide and the middle guide and draw a curve respectively toward the center of the blank sheet and the lower part of the inner guide, the tips contact the outer guide And a step of controlling the bending position and the amount of bending by the tip bending guide.

  According to the present invention, all the work of assembling the blank sheet into the paper box can be performed by the manufacturing apparatus, the assembling time can be shortened, and the production cost can be suppressed.

It is explanatory drawing which shows the general | schematic process of the paper-box manufacturing method by Example 1 of this invention. It is explanatory drawing which shows schematic structure of the paper-box manufacturing apparatus used by a present Example. It is explanatory drawing which shows schematic structure of the paper-box manufacturing apparatus of FIG. It is explanatory drawing which shows schematic structure of the insertion engaging part of FIG. It is explanatory drawing which shows the insertion process of the paper-box manufacturing method by Example 1 of this invention. It is explanatory drawing which shows the insertion process of an ear flap. It is explanatory drawing which shows the general | schematic process of the paper-box manufacturing method by Example 2 of this invention.

Hereinafter, an embodiment of the present invention will be described.
Example 1
FIG. 1 is an explanatory view showing an outline process of a method for manufacturing a carton according to a first embodiment of the present invention. This figure shows the steps of bending a predetermined portion of the blank sheet 10 and assembling it into the paper box 11.
The blank sheet 10 is formed into a shape in which the paper box 11 is expanded by cutting and cutting a paperboard or the like, and as shown in FIG. 1A, for example, the blank sheet 10 is disposed around the bottom plate portion of the paper box 11 Each side wall and a cover plate part are connected to this, and it is formed.
FIG. 2 is an explanatory view showing a schematic configuration of the paper box manufacturing apparatus used in the present embodiment. In the paper box manufacturing apparatus 20 shown in this figure, the blank sheet 10 is carried in from the right side in the figure, transferred to the left side as appropriate, and the respective parts are folded, etc. to be assembled into the paper box 11. FIG. 2A is a top view of the paper box manufacturing apparatus 20, and FIG. 2B is a side view of the paper box manufacturing apparatus 20. As shown in FIG.

The blank sheet 10 is carried into the paper box manufacturing apparatus 20 one by one, and first, as shown in, for example, FIG. 1 (b), the inner side plate constituting the side wall of the paper box 11 is mountain folded and the outside of the side wall Overlap with face plate. This bending operation is performed at the side ear folding portion 21 of the paper box manufacturing apparatus 20 shown in FIG.
Next, as shown in FIG. 1C, in the insertion engagement portion 22 of the paper box manufacturing apparatus 20, the insertion work of the ear flaps provided on the side wall is performed, and the side wall is supported in a state of rising from the bottom plate portion It is fixed. Further, the side walls disposed on the front of the paper box 11 are formed by bending, and the paper box 11 is completed as shown in FIG. 1 (d).

FIG. 3 is an explanatory view showing a schematic configuration of the paper box manufacturing apparatus of FIG. This figure is a perspective view of a portion that becomes the main part of the insertion engaging portion 22 that performs bending and engaging operations on the blank sheet 10 transferred in the direction indicated by the arrow A.
The blank sheet 10 has side walls 10c and 10d provided on each side of the bottom plate 10f, ear flaps 10a provided at the end of the side wall 10c, and ear flaps 10b provided on the side wall 10d. There is. At the respective end portions of the ear flaps 10a and 10b, insertion ports 41a and 41b which are substantially cut portions are respectively provided on the same side in the drawing.

Further, a rear side wall portion 10g disposed behind the paper box 11 is continuously provided at the back side portion of the bottom plate portion 10f, and a cover plate portion 10e is continuously provided via the rear side wall portion 10g. There is.
In FIG. 3, the ear flaps 10a and 10b located on the side of the cover plate 10e are both separated from the cover plate 10e and the back side wall 10g. Further, as shown in FIG. 1 (b), the blank sheet 10 shown in FIG. 3 is formed by folding the inner side plate in a mountain fold and overlapping with the outer side plate to form the side wall 10c and the side wall 10d. . Further, in FIG. 3, the side wall disposed on the front of the paper box 11 is not shown.

FIG. 4 is an explanatory view showing a schematic configuration of the insertion engagement portion of FIG. This figure shows a schematic configuration when the part to be the main part of the insertion engaging part 22 in FIG. 3 is viewed from above, and the lid plate part 10e is disposed on the upper side in the figure, The bottom plate portion 10f is disposed on the side, and the insertion engagement portion 22 is disposed above the bottom plate portion 10f.
The illustrated insertion engaging portion 22 is a mechanical portion for pressing the blank sheet 10 to engage a predetermined portion of the ear flaps 10a and 10b, and a mechanical portion for bending the side walls 10c and 10d. Is omitted.

In the paper box manufacturing apparatus 20, the blank sheet 10 is placed horizontally. The insertion engagement portion 22 is disposed parallel to the blank sheet 10 with a predetermined gap between the plate-like inner guides 31a and 31b and the inner guides 31a and 31b disposed vertically or substantially perpendicularly. The plate-like inner guides 32a and 32b are provided.
Specifically, the inner guide 31a and the middle guide 32a are disposed in parallel, and the inner guide 31b and the middle guide 32b are disposed in parallel. Further, the inner guide 31a is expanded in a substantially V-shape toward both ends (side wall portion 10c and side wall portion 10d) of the blank sheet 10 with the center axis in the width direction of the paper box 11 or blank sheet 10 as the center. The inner guide 31 b is disposed, and the inner guide 31 a and the like and the inner guide 31 b and the like are disposed opposite to each other.
In the case where the inner guides 31a, 31b, etc. are arranged substantially vertically as described above, the upper ends of the inner guides 31a, 31b, etc. are slightly inclined toward the lid plate portion 10e of the blank sheet 10. . In other words, in the blank sheet 10 before the assembly (folding) is started, it is slightly inclined in the extending direction of the ear flaps 10a connected to the side wall 10c and the ear flaps 10b connected to the side wall 10d.

When the insertion engaging portion 22 is placed and fixed on the surface of the blank sheet 10 (the inner side surface of the paper box 11), in FIG. 4, the inner guide 31a is formed such that the outer end portion reaches the upper side of the side wall portion 10c The inner guide 31 b is formed such that the outer end reaches up to the upper side of the side wall 10 d. Further, the middle guide 32a is formed so that the outer end is positioned closer to the above-mentioned central axis than the ear flap 10a or the side wall 10c, and the outer end of the middle guide 32b is formed from the ear flap 10b or the side wall 10d. Is also formed to be closer to the central axis.
In addition, when each of the above guides lowers the insertion engagement portion 22 and presses the blank sheet 10, the center side of the blank sheet 10 so as not to prevent the bending (raising) of the side wall portion 10c and the side wall portion 10d. The lower end portion is formed to be in contact with the surface of the blank sheet 10.

A tip bending guide 34a is disposed between the parallel inner guide 31a and the middle guide 32a, and a tip bending guide 34b is similarly disposed between the inner guide 31b and the middle guide 32b. ing. The tip bending guides 34a and 34b are installed at an appropriate height from the upper surface of the blank sheet 10 on which the insertion engaging portion 22 is placed at a position near the central axis described above. Each of the distal end bending guides 34a and 34b is provided so as to curve downward toward the central axis described above.
In the vicinity of the end near the central axis of the middle guide 32a, an outer guide 33a is disposed with an air gap provided between the middle guide 32a and the middle guide 32a. In the above, the outer guide 33b is disposed by providing an air gap between the inner guide 32b and the inner guide 32b.

In addition, the insertion engagement portion 22 includes an insertion plate 35 that moves in the vertical direction (up and down direction) with respect to the blank sheet 10 on the central axis described above. That is, the insertion plate 35 is disposed between the inner plate 31a and the inner plate 31b, and the above-mentioned middle guides 32a and 32b, tip bending guides 34a and 34b, and outer guides 33a and 33b move the insertion plate 35. It is arranged so as not to touch. In FIGS. 3 and 4, the mechanism for moving the insertion plate 35 in the vertical direction, the drive means and the like are omitted. Also, as described above, when the inner guides 31a, 31b, etc. are arranged inclined (substantially vertical), the insertion plate 35 and the drive means, etc. are also guided by the substantially vertically arranged inner guides 31a, 31b, etc. The ear flaps 10a and the ear flaps 10b are arranged so that they can be engaged as described later.
As described above, the inner guide 31a and the inner guide 31b, and the middle guide 32a and the middle guide 32b, are inserted so that the insertion slot 41a of the ear flap 10a and the insertion slot 41b of the ear flap 10b are mutually inserted. It is spread and arranged so that it becomes a letter.

Next, the operation will be described.
FIG. 5 is an explanatory view showing the insertion step of the paper box manufacturing method according to the first embodiment of the present invention. This figure shows the plug-in assembling process of the ear flap 10a and the ear flap 10b.
The blank sheet 10 is transferred below the engagement portion 22 with the bottom plate portion 10f as the leading end. As shown in FIG. 5 (a), the inserting and engaging portion 22 is lowered to the stationary blank sheet 10, and for example, the rear side wall portions using the lower ends of the inner guides 31a and 31b and the middle guides 32a and 32b. Press down 10g from above.

  Next, using a bending mechanism (not shown) (hereinafter, illustration and explanation of operations of the bending mechanism etc. for bending each part will be omitted), the site to be the back end of the side walls 10c and 10d is bent, The ear flap 10a and the ear flap 10b are raised as shown in FIG. 5 (b). The ear flaps 10a and 10b are raised until they abut on the outer ends of the inner guides 31a and 31b, respectively, and the boundary portions between the ear flaps 10a and 10b and the side walls 10c and 10d are bent substantially at right angles.

Next, as shown in FIG. 5 (c), the side wall portion 10d and the bottom plate portion 10f are inserted so that the ear flap 10b in contact with the inner guide 31b is inserted between the inner guide 31b and the middle guide 32b. Bend the boundary with By bending in this manner, the tip end portion of the ear flap 10b draws a curve and moves toward the central axis (central) direction of the blank sheet 10 or toward the central lower ends of the inner guides 31b.
Further, the side wall portion 10c and the bottom plate portion are arranged such that the ear flap 10a in contact with the inner guide 31a is inserted between the inner guide 31a and the middle guide 32a by appropriately delaying the above-described ear flap 10b. Bend the boundary with 10f. By bending in this manner, the tip end portion of the ear flap 10a draws a curve and moves toward the central axis (center) direction of the blank sheet 10 or toward the central lower ends of the inner guides 31a.

When the side wall portion 10d is further bent and the ear flap 10b moves between the inner guide 31b and the middle guide 32b, as shown in FIG. 5 (d), the tip portion of the ear flap 10b bends its tip It abuts on the guide 34 b and is gently bent toward the rear end side of the blank sheet 10, that is, the lid plate portion 10 e side.
Further, when the side wall portion 10c is further bent with a suitable delay from the side wall portion 10d and the ear flap 10a moves between the inner guide 31a and the middle guide 32a, the tip portion of the ear flap 10a bends at the tip It abuts on the guide 34 a and is gently bent toward the rear end side of the blank sheet 10, that is, the lid plate portion 10 e side.

FIG. 6 is an explanatory view showing an ear flap inserting process. When the end of the side wall portion 10c and the end portion of the side wall portion 10d are connected, the ear flap 10a and the ear flap 10b preferably have a linear shape, but the insertion openings 41a and the insertion openings 41b of the respective ear flaps It is difficult to engage in a linear arrangement.
When actually engaging, as shown in FIG. 4, the inner guide 31a and the middle guide 32a, and the inner guide 31b and the middle guide 32b are expanded in a substantially C shape, as shown in FIG. It arrange | positions so that the front-end | tip part of each flap may cross, as shown to. Thus, each flap is arranged, for example, the ear flap 10a is lowered from the upper side to the outlet 41b of the ear flap 10b disposed below, and the outlet 41a of the ear flap 10a is engaged.

  Further, when the insertion slot 41a and the insertion slot 41b are engaged as described above, the tip of the ear flap 10a is brought into contact with the tip bending guide 34a as shown in FIG. 6B, and the ear flap 10a is engaged. The side wall surface of the tip (the opening of the insertion opening 41a) is directed to the tip of the ear flap 10b to be inserted. Although the ear flap 10a side is illustrated in FIG. 6 (b), the side wall surface of the tip (opening part of the insertion opening 41b) is similarly directed to the tip of the ear flap 10a to be inserted. It is like that.

As shown in FIG. 6 (a), when the tip of the ear flap 10a and the tip of the ear flap 10b are intersected, the more substantially these parts are straightened, the smaller the opening part of the actual insertion opening becomes. Specifically, as the ear flap 10a and the ear flap 10b approach a parallel state, the opening width of the insertion port projected in the insertion direction of the tip of each flap is narrowed.
The ear flap 10a shown on the left side of FIG. 6C shows a state where it is not bent by the tip bending guide 34a. Further, in the drawing, the arrow P indicates the direction in which the tip of the ear flap 10b (not shown) faces, or the extending direction of the ear flap 10b defined by the inner guide 31b and the middle guide 32b. In this state, the angle between the direction indicated by the arrow P and the opening width direction of the insertion opening 41a of the ear flap 10a is an acute angle. Here, the projection size of the arrow P, that is, the projection width of the opening 41a facing the tip of the ear flap 10b is S1.

The ear flap 10a shown on the right side of FIG. 6 (c) shows a state in which the tip is bent when the tip bending guide 34a abuts as shown in FIG. 6 (b). In this state, the tip of the ear flap 10a is bent so that the side surface of the tip is directed to the tip of the ear flap 10b, and the socket 41a of the ear flap 10a also opens in the direction indicated by the arrow P. .
At this time, an angle generated between the direction indicated by the arrow P and the width direction of the insertion opening 41a is a large angle as compared with that shown in FIG. Further, the projection size of the opening width of the insertion opening 41a facing the tip of the above-mentioned ear flap 10b is S2, and the opening size is substantially larger than the projection size S1 of FIG.
As described above, each flap is arranged in a substantially C shape, and the projection size of the opening width is further increased as described above, so that it is easy to insert the ear flap 10b into the insertion slot 41a of the ear flap 10a. It will also be possible to do it reliably.

  Although the ear flap 10a is illustrated in FIGS. 6 (b) and 6 (c), the opening width of the insertion slot 41b of the ear flap 10b is similarly obtained by the contact of the tip bending guide 34b with the ear flap 10b The projection size is increased, and the insertion of the ear flap 10a can be performed easily and reliably.

  In FIG. 5 (d), the ear flaps 10b are in contact with the distal end bending guides 34b, and the ear flaps 10a are in contact with the distal end bending guides 34a, and as described with FIG. Substantially expand. As shown in FIG. 5 (e), the ear flap 10b provided with the insertion opening 41b opened upward in the state where each tip is bent in this manner is a bottom plate portion 10f or an end prior to the ear flap 10a. It reaches the position in contact with the back side wall 10g. After this, from the upper side of the ear flap 10b, the ear flap 10a provided with the outlet 41a opening downward is approached so as to cover it.

When the ear flaps are moved to the vicinity of the lower end of the insertion engaging portion 22 in a state in which the ear flaps abut on the tip bending guides 34a and 34b, the tips of the ear flaps are excessively bent and a curved deflection occurs. In detail, the tip of each ear flap is warped back to the lid plate portion 10e side, and this warped portion abuts on the back side wall portion 10g and becomes an obstacle when assembling the paper box 11.
Therefore, the respective tips are brought into contact with the outer guides 33a and 33b so as not to bend excessively, and the ear flaps are bent to such an extent that they can be approximately straight after insertion. In other words, the tip of the ear flap 10a is brought into contact with the outer guide 33b, and the tip of the ear flap 10b is brought into contact with the outer guide 33a to regulate the bending position and bending amount of each tip to an appropriate one.

  As described above, when the ear flaps 10a and the ear flaps 10b are engaged, the rear side wall portion 10g is vertically raised relative to the bottom plate portion 10f when it is substantially linear, and the rear side wall portion 10g is linear It becomes possible to form in a shape. When the paper box 11 is completed, the insertion ports 41a and 41b are provided with an appropriately large opening width so that the ear flaps 10a and the ear flaps 10b engaged as described above become substantially linear. After the tip end of the ear flap 10a and the tip end of the ear flap 10b are alternately engaged with each other, each ear flap moves slightly in the extending direction, and the length in the extending direction can be adjusted.

Subsequently to the assembling operation shown in FIG. 5 (e), the side wall portion 10b is bent to be perpendicular to the bottom plate portion 10f, and the side wall portion 10a is made to be perpendicular to the bottom plate portion 10f with a slight delay. Bend it.
By these bending processes, as shown in FIG. 5 (f), the ear flap 10b guided by the inner guide 31b and the middle guide 32b abuts on the bottom plate portion 10f or the rear side wall portion 10g.

Thereafter, the ear flaps 10a guided by the inner guide 31a and the middle guide 32a reach above the ear flaps 10b, and the tips of the ear flaps overlap and cross each other.
At this time, the tips of the respective ear flaps are bent as described above, and both the insertion port 41a and the insertion port 41b are in a state in which they can be easily inserted into the mating side. Therefore, when the tips of the respective ear flaps are crossed as described above, the opening portions of the insertion port 41a and the insertion port 41b overlap and are in an inserted and mutually engaged state.

When the insertion slot 41a is overlapped above the insertion slot 41b and inserted into each other, the driving means (not shown) is operated to make the insertion plate 35 an ear flap as shown in FIG. 5 (g). Lower from above 10a.
The lowered insertion plate 35 applies pressure to the tip of the ear flap 10 from the upper side, pushes the insertion slot 41a into the back (lower side) of the insertion slot 41b, and deeply engages the ear flap 10a and the ear flap 10b.
After lowering to a predetermined height and engaging the insertion ports as described above, the insertion plate 35 is raised to a predetermined position, and the insertion engagement portion 22 is further raised as shown in FIG. It is separated from the blank sheet 10 in which each portion is bent as described above.
Thereafter, the other part of the blank sheet 10 is assembled to complete the paper box 11.

  As described above, according to the present embodiment, the insertion slot 41a of the ear flap 10a and the insertion slot 41b of the ear flap 10b can be mutually inserted by the insertion engagement portion 22 of the paper box manufacturing apparatus 20 It is possible to engage the overlapping ear flaps regardless of each other.

(Example 2)
FIG. 7 is an explanatory view showing a schematic process of the method of manufacturing a carton according to the second embodiment of the present invention. This figure shows the manufacturing method of the paper box 50 which formed each wall part of 4 sides in frame shape. The paper box manufacturing apparatus used in the second embodiment, which assembles the paper box 50 by bending the blank sheet 51, is configured substantially the same as that described in the first embodiment, and further, for example, back side and front side of the paper box 50. It is configured to engage the ear flaps in two places. In addition, description and illustration are abbreviate | omitted about the lid etc. which become a separate body from the illustrated paper box 50 here.

FIG. 7A shows a state in which the respective portions of the blank sheet 51 are bent to form the side wall 51 e and the side wall 51 f in a frame shape. For example, the ear flap 51a is continuously provided at the rear end of the side wall 51e, and the ear flap 51c is continuously provided at the front end. Further, an ear flap 51b is continuously provided at the rear end of the side wall 51f, and an ear flap 51d is continuously provided at the front end.
For example, the ear flap 51a and the ear flap 51c are configured in the same shape as the above-described ear flap 10a, and the ear flap 51b and the ear flap 51d are configured in the same shape as the ear flap 10b.

When raising the side wall 51e and the side wall 51f from the bottom plate or the like of the blank sheet 51 in the same manner as described in the first embodiment, the ear flap 51a and the ear flap 51b are respectively formed using the insertion engaging portion 22 or the like. Insert and engage the provided receptacles (not shown). Similarly, the ear flap 51c and the ear flap 51d are inserted and engaged using the insertion engaging portion 22 and the like.
After engaging the ear flap 51a and the ear flap 51b as described above, the cardboard box manufacturing apparatus according to the second embodiment covers, for example, the folded portion and the like so as to cover the engaged ear flap 51a and the ear flap 51b. Is used to bend the back side wall 51 g of the blank sheet 51.
Furthermore, the protrusion 51k provided at the edge of the rear side wall 51g by this bending is inserted into, for example, the insertion hole 51m installed in the bottom plate of the paper box 50, and as shown in FIG. 7 (b) Form the rear side wall 51g.

Similarly, the front side wall 51h of the blank sheet 51 is bent using a bending portion or the like so as to cover the engaged ear flap 51c and ear flap 51d, and provided at the edge of the front side wall 51h. For example, the projection 51k is inserted into an insertion hole 51m (not shown) provided in the bottom plate of the paper box 50 to form a frame-like front side wall 51h.
The order in which the front side wall 51h and the rear side wall 51g are assembled and formed is assembled according to the operation control and the like set in advance according to the arrangement and configuration of each part of the carton manufacturing apparatus. It is not limited to the order of description etc.

  As described above, according to this embodiment, the engagement between the ear flap 51c and the ear flap 51d disposed on the front side of the paper box 50 and the engagement between the ear flap 51a and the ear flap 51b disposed on the rear side. This can be performed without using a manual operation by using the insertion engaging portion 22 or the like, and the paper box 50 in which the wall portions of the four sides are formed in a frame shape can be assembled and manufactured only by the paper box manufacturing device.

Reference Signs List 10 blank sheet 10a, 10b ear flap 10c, 10d side wall portion 10e lid plate portion 10f bottom plate portion 10g back side wall portion 11 paper box 20 paper box manufacturing device 21 side ear folded portion 22 insertion engaging portion 31a, 31b inner guide 32a, 32b Guides 33a, 33b Outer guides 34a, 34b Bent guides 35 insertion plates 41a, 41b inserts 50 paper boxes 51 blank sheets 51a, 51b, 51c, 51d Ear flaps 51e, 51f Side wall portions 51g Back side wall portions 51h Front side wall portions 51k projections 51m inserts Hole

Claims (2)

A paper box manufacturing method for assembling a paper box by bending a predetermined position of a blank sheet, comprising:
As viewed from above, a vertical plate is disposed vertically or substantially perpendicularly to the blank sheet, and a bottom plate portion provided on the blank sheet is disposed in front of a lid plate portion formed by connecting the bottom plate portion. A first step of placing on the surface of the blank sheet an inner guide which is expanded in a substantially C shape toward both ends of the blank sheet with the center axis in the width direction of the blank sheet as the center ;
A first ear flap and a second ear flap respectively connected to two side wall portions provided at both ends of the blank sheet are bent so as to rise from the respective side wall portions. A second process of bringing each into contact with the
A third step of bending the side wall from the bottom plate provided on the blank sheet so as to lift the first ear flap and the second ear flap along the inner guide;
A fourth step of engaging the tip of the first ear flap with the tip of the second ear flap when the tip of the first ear flap and the tip of the second ear flap overlap due to the movement;
Have
The third step is
Moving the tip of the first ear flap delayed relative to the tip of the second ear flap toward the center of the blank sheet;
When the tip of the first ear flap and the tip of the second ear flap respectively move in a curve to move to the center of the blank sheet and the lower part of the inner guide, the tips abut against the tip bending guide and bend in a predetermined direction Expanding the inserts provided at each end;
Including
The fourth step is
Crossing the tip of the first ear flap moved to the center of the blank sheet and the lower part of the inner guide with the tip of the second ear flap with the tip bent;
Engaging the spread spread outlets stacked by crossing the respective tips;
including,
A method of manufacturing a paper box characterized by The third step is
Moving the first ear flap and the second ear flap between a middle guide disposed parallel to the inner guide and the inner guide;
When the front end of the first ear flap and the front end of the second ear flap move between the inner guide and the middle guide to draw curves respectively toward the center of the blank sheet and the lower portion of the inner guide, A step of controlling the bending position and the amount of bending by the tip bending guide while the tip is in contact with the outer guide;
including,
The method for manufacturing a carton according to claim 1, characterized in that:

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