JP2000006270A - Corner reinforced tray box making machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To make a tray having a reinforcing post composed of a triangular cross section at four corners from a flat blank sheet in a box, eliminating the need for a front-stage curl folding step,
The configuration is such that the installation space for machinery and equipment is small,
On top of that, the box making accuracy is improved, and at the same time the box making speed is improved. SOLUTION: In a box making machine for assembling a blank sheet in which a side panel and / or a bottom panel are extended on four sides of a rectangular bottom panel, a square mandrel 15 capable of lifting and lowering the bottom panel; It has a fixed guide member 16 that receives the mandrel in a removable manner,
In addition, a flap pressing arm 15a that can freely move outward from the side surface of the mandrel is built in the mandrel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flat blank sheet mainly made of cardboard or paperboard,
The present invention relates to a box making machine for assembling a tray having reinforcing posts composed of columnar spaces having triangular cross sections at four corners.

[0002] The tray of the above-mentioned special form has reinforcing posts, that is, columnar spaces at the four corners, so that the pressure resistance is remarkably higher than that of an ordinary four-walled tray or carton. Therefore, it is possible to store products that are inexpensive and therefore inferior in independence. That is, for example, bag-in-box, standing pouch, etc.
Liquids, powders, stored in relatively flexible plastic bags,
Alternatively, it is possible to store a product having a high fluidity such as a viscous material, and even in such a case, the same strength as when a bottle or a can is stored in a normal carton is exhibited. For this reason, it is also useful for reducing the generation of non-combustible waste such as bottles and cans, and is one of the tray types that have been receiving attention in recent years.

[0003]

2. Description of the Related Art First, the structure of the tray will be described.
Explain that there is a difficulty in automatic assembling from a blank sheet or automation of box making because of its structure. One example of the tray is shown in FIG. 1 and is characterized in that column-shaped (= post-shaped) spaces 2 are formed at four corners of the tray body 1. In assembling and manufacturing, special means for forming the post portion are required, and various mechanisms must be combined for automation other than hand application, and as described below, as a whole, a complicated and large device is required. I had to be.

[0004] By the way, as a material for the tray, paperboard and corrugated cardboard are generally used. However, in order to increase the bending accuracy of these materials, it is necessary to go through a "curly folding process". For example, US Pat.
As disclosed in the specification of US Pat. No. 4,653, FIG.
The apparatus as shown in FIG. 2 (B) and FIG. 3 (A) to FIG. 3 (D) had to be provided at the previous stage of the box making process. That is,
The flaps 2a for forming the columnar space portions 2 at the four corners of the tray have to be bent toward the inner surface of the panel wall of the tray body, and the edges have to be fixed to the panel wall surface. Therefore, prior to the fixing, the flap portion is shown in FIG.
In (A), the habit folding is performed via a guide device indicated by reference numeral 9. More specifically, as shown in the figure, the blank sheet is folded once through a fixed guide device having a large number of tapered rollers 9a to 9d and having a gradually increasing inclination of the rotating shaft of the rollers. The folding flap 2a formed on the sheet is fixed to the inside of the panel surface of the tray.

[0005]

As described above, when forming a corner-reinforcement type tray from a blank sheet, a fixed guide device for folding the blank is required in a stage preceding the box making device. However, this device has the following problems, and has a problem that it is difficult to put it to practical use. First, the blank sheet is made of paperboard or corrugated cardboard, which is a sheet having relatively high rigidity, and these sheets have different stiffness depending on the kind. Was difficult to cope with a change in rigidity, and therefore the bending accuracy was low. In particular, when cardboard was used as the material, the bending accuracy in the step direction (flute direction) was low, and this was an obstacle to increasing the efficiency of box making. Second, in order to reduce the bending resistance of the material as much as possible, a guide device with a gentle curve is required, but for that purpose the machine length is inevitably increased, and the space for installing the device is inevitably increased. However, there has been a drawback that the equipment cost has to be widened and the equipment cost is increased. Here, the present invention, in order to eliminate the disadvantages of the conventional type, to identify the problems,
As a result of diligent research, they have succeeded in developing an efficient new device.

In other words, the present invention eliminates the necessity of the former step of folding the tray in the case of producing the tray from the flat blank sheet and reduces the installation space of the mechanical device. It is intended to increase the box making accuracy and at the same time to improve the box making speed.

[0007]

In order to achieve the above object, according to the present invention, there is provided a box making machine for assembling a blank sheet in which a side panel and / or a bottom panel are extended on four sides of a rectangular bottom panel. , A vertically movable square mandrel 15 for pushing down the bottom panel, and a fixed guide member 16 for removably receiving the mandrel.
And a flap holding arm 15a which is made to be able to protrude and retract from the side surface of the mandrel to the outside, is provided in the mandrel.

The mandrel can be moved up and down in two steps via a cylinder, so that the two-step folding of the flap formed on the panel can be performed with the same mandrel as described above without incorporating a special folding mechanism. This can be realized by using a guide member.

Further, in the present invention, the flap holding arm incorporated in the mandrel is mounted so as to be rotatable within a range of 90 degrees by using the reciprocating motion of an actuator or a cylinder. It succeeded in compacting the entire mechanism.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example of a carton blank or a blank sheet (hereinafter simply referred to as a blank) used in the present invention will be described with reference to FIG. This blank 1 has a pair of end panels 4, 4 opposed to four sides or four circumferences around a rectangular bottom panel 3 serving as a bottom of a tray applied to the present invention, and side panels 5, 5. The panel is extended, and the following flaps are formed at both ends of each panel.

First, a description will be given of the end face panel 4 in which flaps for forming the column-shaped (= post-shaped) spaces 2 are extended. As shown in FIG. 4 (A), three folding flaps indicated by reference numerals 2a to 2c are sequentially provided at both end edges of the panel 4 through ruled lines, and these flaps are sequentially arranged inside as described later. After being folded, the entire panel 4 is raised at right angles to the bottom panel 3 to assemble a tray with a post to which the present invention is applied.

Referring to the side panel 5 located at a position adjacent to the end panel 4, this panel is positioned at the time of assembly so as to cover the outer surface of the post portion 2 of the end panel, as shown in FIG. In the illustrated example, before the panel 5 is set up at a right angle, a flap 5 provided at a central edge of the side panel 5 is provided.
a is turned 180 degrees inward and fixed to the inner surface of the panel.

Next, the configuration of the box making machine itself will be described based on the embodiment shown in FIGS. FIG. 5 is a front view of the box making machine, and FIG. 6 is a side view thereof. In the figure, reference numeral 10 denotes a magazine rack for blank sheets, and 11 denotes one blank sheet 1a located at the bottom of the rack. Each of the conveyors is horizontally conveyed, and is composed of a pair of belt conveyors provided to face each other in the vertical direction.The blank is sandwiched between conveyor belts arranged vertically and the next stage. Supplied to the assembly process.

FIG. 8A shows the overall structure of the box making apparatus showing the assembling process.
2 and a subsequent four-peripheral panel riser 14.
First, the flap folding device 12 at the front stage will be described. This device is a device for folding flaps provided at both end edges of the end face panel 4 formed on the blank 1a. Of the flaps 2a to 2c, 2 sheets (2a
And 2b) act as a unit at a right angle.
A cylinder 12b for horizontal movement equipped with a folding roller 12a in contact with the flap;
b and the cylinders 12c that can move in the vertical direction while supporting the rollers together. The folding rollers 12a cause the flaps 2a and 2b to stand at right angles to the end panel 4 in accordance with the movement of the cylinders. It is folded in as if raised.

The folding device 12 is provided on each side of the folding device 12 because two panels 4 are provided, and a flap reversing device indicated by reference numeral 12d is provided therebetween. . The reversing device is a device that turns the flaps 5a provided at both end edges of the side panel 5 by 180 degrees to obtain the state shown in FIG.
The configuration of d is exactly the same as that of the folding device 12, and the folding state of the flap can be controlled by adjusting the movement of the cylinder, mainly the stroke, of the device. In the illustrated example, the device 12
d, the flap 5a provided at the edge of the panel 5 is
It is processed so as to be turned back at 80 °.

By the way, when the folding device 12 and the reversing device 12d are illustrated, only the device located on one side of the blank is illustrated. However, in an actual machine, these devices are arranged on both sides of the blank. The blank 1 is processed into the folded state shown in FIG. 4C via the apparatus.

Thus, the blank 1 is folded in the state shown in FIG.
In this case, as a conveying means, for example, a chain conveyor 1 with a pushing claw shown in FIGS.
3 is used. By the way, in the figure, the pushing claw indicated by the reference numeral 13a moves the blank to the position of the next panel start-up device 14 while pushing the rear end edge of the blank 1.

Next, the four-panel panel start-up device 14 will be described. As shown in FIGS. 6 to 8, the apparatus comprises a mandrel 15 which can be raised and lowered and a fixed or semi-fixed guide member 16 for receiving the mandrel, which is provided substantially in the center of a machine frame 14a of the apparatus, and a mandrel. Is provided before and after the holding cylinder 14d for temporarily holding the flap 4a of the blank 1. Reference numeral 14c is a guide plate for supporting the supplied blank from below.

The mandrel 15 has a built-in flap pressing arm 15a, and the actuator 1 which rotates the support shaft of this arm within a range of 90 ° by air as an example.
5b, which are connected to the drive shaft of the flaps 2a and 2b and are extended from the end face panel 4 (FIG. 8A).
8 (B)) is temporarily pressed down from above. As a drive source of the arm, in addition to the actuator described above, as shown in FIG. 9C, the support shaft of the arm 15a is connected to the working shaft of the cylinder 15d via the connecting rod 15c, and the arm is reciprocated by the cylinder. 15a can also be rotated.

In any of the above mechanisms, the holding arm 15a is always in a state of being housed inside the mandrel 15, and if necessary, the arm is moved from the side of the mandrel to the outside. So that they can appear and disappear
The flap 2a supplied just below the arm is turned so as to be pressed down from above while being folded through the ruled line.

Next, the relationship between the mandrel 15 and a fixed guide member 16 for receiving the mandrel in a detachable manner will be described. As shown in FIGS. 6 and 7, the mandrel 15 is attached to the upper frame 14b of the frame 14a so as to be suspended. That is, this mandrel is mounted on the upper frame 14b via an upper mounting substrate 15e, and at this time, the substrate 15e is a small-stroke cylinder provided between the substrate and the upper frame 14b. It is mounted indirectly via a cylinder 15g and a large stroke cylinder 15g. Therefore, the mandrel 15
First, by operating the small cylinder 15f, the mandrel 15 is lowered by the distance indicated by the symbol X in FIG. 7, and then by operating the large cylinder 15g, the mandrel 15 is moved to a position holding the distance indicated by the symbol Y in FIG. Will be lowered.

When the mandrel is a male member, a fixed guide member indicated by reference numeral 16 functions as a corresponding female member. This has a rectangular tube shape corresponding to the outer shape of the mandrel as a whole. To explain in detail, the guide member is composed of a total of four guide plates 16a, 16a and 16b, 16b corresponding to the four peripheral panels of the tray to be made, and each of the guide plates facing each other is provided. 8B, only outwardly curved upward (see FIG. 8B), or as shown in FIG. 7, formed so as to form an upward tapered surface, and a member connected thereto is vertically bent. It consists of a flat plate that extends. The reason why the guide member is opened in the shape of an upward trumpet as described above is to make it easier for the above-mentioned mandrel or tray during assembly to enter from above. Note that guide plates adjacent to each other have different heights, and are provided with a difference in height as indicated by a symbol L in FIG. 8B.

Each of the guide plates 16a and 16b is provided with a cylinder device for adjusting the space Z between the guide plates which are symmetrical with each other behind the guide plates 16a and 16b. While pressing the tray from the outside,
This is because the inner mandrel 15 receives the load and ensures the gluing of the tray.

In addition to the above, the following auxiliary devices are attached to the four-round panel starting device 14. An ancillary equipment for folding the flaps 2a to 2c of the wife's face panel 4. First, a reverse folding device 14e. This device is disposed on both sides of the mandrel. By rotating about the shaft rod, the flap 2a is bent as shown in FIGS. 4 (C) to 4 (D).
That is, once the flap is folded in the opposite direction (outward), the degree of freedom in bending the flap portion is increased.

At the position where the flap 2a is supplied, a cylinder 20 for folding the middle flap 2b adjacent to the flap further inwardly into a U-shape is provided.
Are provided symmetrically in the front and rear, right and left of the mandrel by the number of the flaps, and for suppressing the boundary between the middle flap 2b and the flap 2a of the end face panel 4 from above to fix the fold. A cylinder 21 is provided.

A belt conveyor 22 is provided directly below the mandrel 15 for discharging the trays.

[0027]

As shown in the operation flow chart of FIG. 4A, the apparatus according to the present invention is arranged such that blanks S stacked in a magazine indicated by reference numeral 11 are placed at the lowermost position, and are sequentially fed. The folding device 12 of the machine via the belt conveyor 11
Is supplied to the four-circle panel start-up device 14 disposed adjacent thereto. Incidentally, although not shown, for example, a hot-melt adhesive is applied in a streak shape to a predetermined position on the bottom panel of the blank and on a flap of each side surface or the end panel at the time of supply. Further, when the blank S is supplied to the part of the folding device 12, the flap 2a portion is L-shaped as shown in FIG. To the center of the side panel at the same time
Fold it back 80 degrees and fix it to the inner surface of the tray.

The blank having the above-mentioned configuration is then introduced into the next-stage four-circle panel starting device 14 via the conveyor 13 having the pushing claws 13a, and then the respective panels 4 constituting the tray are formed. 4 and 5, 5 are bottom panel 3
And stand up at right angles to the four peripheral walls of the tray. Hereinafter, the details will be described.

In FIG. 8A, when the blank 1 is supplied to the portion indicated by reference numeral 14, first, the presser cylinder 14d existing in the same portion operates so as to temporarily press the flap 4a of the blank 1. At the same time, the mandrel 15 performs the first stage of descending operation from above to hold the blank in a state as shown in FIG. In this state, the reverse folding device 14e disposed at the position of the flaps 2a to 2c is operated, and the claw 14f of the device swings the flap 2a right and left around the ruled line to form a habit. Thereby, the degree of freedom of folding the sheet through the ruled line is increased.

Next, the cylinder 20 for folding the inner flaps 2b and 2c adjacent to the flap 2a further inwardly is operated, and the flap 2c is folded into a triangular cross section as shown in FIG. 8A. Thereafter, the temporary holding cylinder 21 separately provided protrudes downward from the obliquely upper side, so that the flap portion is suppressed at the tip of the operating shaft of the cylinder.

The flaps 2a to 2c of the blank end face panel 4 are shown in FIGS.
It is in a folded state as shown in FIG. At this time, according to the present invention, the rotatable flap holding arm 15a built in the mandrel 15 projects from the side wall portion of the mandrel and presses the flap portion from above along the ruled line, so that the habit is formed in advance. Even if it is not attached, it becomes possible to fold smoothly and accurately.

After the above state is temporarily maintained, the mandrel 15 then moves to the second stage of descending operation. That is, the large cylinder 15f mounted above the mandrel 15 operates to move the mandrel downward, and accordingly, the blank 1 provided outside the mandrel is pushed down together with the mandrel. Then, the tray which is being assembled along the lowering operation of the mandrel is moved to the guide member 16 which is opened in a trumpet shape existing below.
Into the inside of the tray, the tray is held from the outside, and the four-sided panel of the tray descending with it is sequentially raised, and at the same time, the four walls of the tray are glued through the adhesive previously applied to each part. A box-shaped tray is fixed to each other.

As described above, the panels 4, 4 and 5,
When the stand 5 rises, each guide plate 1 constituting the guide member 16
6a and 16b are cylinders 16c provided behind them.
The panel of the tray is gradually pressed inward from the outside through the inside to enhance the bonding effect of the above-mentioned adhesive, and the tray in which the bonding is completed is released by releasing the cylinder 16c, and the free fall is performed. Is transferred to the upper surface of the discharge belt conveyor 22 located at the lowermost stage.

[0034]

According to the present invention, when producing a tray or a carton case using paperboard or corrugated cardboard having relatively high rigidity as a paper, a preliminary creasing of the paper conventionally required is eliminated. Since it can be folded directly directly without going through such a habit folding device, it becomes a space-saving box making device, and on that, it becomes possible to insert it correctly at the time of box making, so defective products such as adhesion peeling etc. This has the effect of preventing occurrence.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a tray applied to a box making machine of the present invention.

FIGS. 2A and 2B are a perspective view showing a conventional apparatus for imparting a curl to a sheet in box making and a perspective view showing an example of a blank sheet folded by the apparatus. is there.

FIGS. 3 (A) to 3 (D) are operation explanatory diagrams showing main parts of the conventional device.

FIG. 4 is a perspective view showing a blank sheet of a tray manufactured by the apparatus of the present invention, showing a sequence in which a flat sheet is sequentially folded to form a three-dimensional tray.

FIG. 5 is a front view of the box making machine of the present invention.

FIG. 6 is a side view of the box making machine.

FIG. 7 is a rear view of the same.

FIG. 8 is a perspective view showing a main part of the present invention, and is a conceptual perspective view showing a relative positional relationship between a flap folding device and a panel rising device in the above device.

9A is a plan view schematically showing a flap holding arm housed in a mandrel in the box making machine of the present invention, FIG. 9B is a side view, and FIG. FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 blank sheet 2 columnar space of tray 2 a to 2 c folding flap 3 bottom panel of tray 4 bottom panel 5 side panel 9 a to 9 e taper roller 10 magazine rack 11 conveyor 12 flap folding device 12 a folding roller 12 b horizontal movement cylinder 12 c vertical movement Cylinder 12d Flap reversing device 13 Chain conveyor 13a Pushing claw 14 Four-panel panel rising device 14a Machine frame 14e Reverse folding device 14f Claw 14g Shaft bar 15 Mandrel 15a Flap pushing arm 15b Actuator 15e Substrate 15f Small cylinder 15g Large cylinder 16 Guide Members 16a to 16b Guide plate 20 Folding cylinder 21 Temporary holding cylinder 22 Discharge conveyor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroaki Kobayashi 2-1-3 Bunka, Sumida-ku, Tokyo Inside Kao Corporation Research Laboratory (72) Inventor Shoichi Kawase 5-12-8 Ginza, Chuo-ku, Tokyo Oji Paper (72) Inventor: Tetsuo Murakami 300, Hiraki, Fuji City, Shizuoka Prefecture F-term in Oji Koei Co., Ltd.F-term (reference) DD34 GA03

Claims (3)

[Claims] 1. A box-making machine for assembling a blank sheet having side panels and / or end panels extended on four sides of a rectangular bottom panel, comprising: a vertically movable square mandrel (15) for pushing down the bottom panel. A fixed guide member for removably receiving the mandrel.
And a flap presser arm (15a) which is capable of protruding and retracting outwardly is built in the mandrel on at least one side of the mandrel. 2. The box making machine according to claim 1, wherein said mandrel can be raised and lowered in two stages via a cylinder. 3. The box making machine according to claim 1, wherein the flap holding arm built in the mandrel is mounted to be rotatable outward in a range of 90 degrees by an actuator.