JPH0357466Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to a mold for making boxes, and more specifically, it forms rectangular bending grooves in a thermoplastic resin plate, and This invention relates to a cross-shaped mold for cutting corners (ears).

<Prior art> Conventionally, as an assembled box made of thermoplastic resin, a plate material such as a foam sheet, in which a bending groove has been formed and the four corners have been cut, is bent upright from the bending groove, and the upright part is bent. (peripheral side parts) are assembled and formed by heat-sealing or adhesive bonding the ends of each other, and the mold for forming the above-mentioned plate material is one in which strip-shaped thermal blades are arranged in a grid pattern. is used.

However, when molding the above-mentioned plate materials, the molds must be replaced for each product type, resulting in the problem that it takes a long time to change the molds, which reduces the actual operating rate of the equipment and increases product costs. . Another problem was that mold costs were high because molds had to be prepared for each product type.

In order to solve this problem, as shown in FIG. 14, a main blade 91 for forming the bent groove and a corner blade 92 for cutting the edge are arranged in series with a predetermined gap 93 between them. The other main blade 91 is inserted into the gap 93 and combined in a grid pattern, and the gap 93 is
An attempt has also been made to improve this by attaching a slidable support blade 94 for cutting the selvedge to the end of the main blade 91 through which the main blade 91 is inserted, with its blade edge side brought into close contact with the support blade 94.

According to the above mold, it is possible to variably adjust the distance between the opposing main blades 91, the distance between the corner blades 92, and the distance between the corner blades 92 and support blades 94 in series, so that plates of various sizes can be The bending grooves can be formed and the ears can be cut, and the above-mentioned problems can be solved.

However, the mold with the above configuration has a main blade 9
1 and the corner blade 92 are separated, it is difficult to maintain a uniform temperature between them during molding, and the thermal conductivity to the support blade 94 is poor.
It is difficult to maintain the temperature of the entire mold, and as a result,
A new problem has become clear: molding defects are likely to occur.

<Purpose> This invention was made in view of the above problems, and it is possible to mold many types of plate materials with one mold,
The purpose of the present invention is to provide a mold for box manufacturing that can contribute to reducing mold replacement time and mold cost, and ultimately to lower product costs, and also allows easy maintenance of the temperature of the entire mold.

<Structure> In order to achieve the above object, the structure of the box-making mold of this invention is such that a slide portion having a notch of a predetermined length is formed on one end side, and the slide portion can be inserted into the other end side. Four thermal blades forming a cross section having a cut with a contoured shape are assembled in a parallel grid shape by slidably fitting the cross section of the other thermal blade into the sliding section of each thermal blade. At the same time,
A corner blade having a cutting edge formed in a right angle direction is attached to the side surface of the cross section side end of each heat blade along the four corners of the mold including the side surface. be.

<Example> Next, an example of this invention will be described below with reference to the drawings.

FIG. 3 is a front view showing a horizontal box-making device equipped with the box-making mold 2 of this invention, on which both sides are firmly connected to each other by a diver 10 on a pedestal 1. A pair of fixed frames 11 and 12 are formed to stand apart from each other by a predetermined distance, and a movable frame 13 is attached to the diver 10 so as to be horizontally movable. This movable frame 13 can be reciprocated by a cylinder 14 attached to the fixed frame 12.

A cross-shaped mold 2, which is a feature of this invention, is attached to the movable frame 13 via a mold slide means 3 for changing molding dimensions, which will be described later.
A cylindrical die 4 for forming the plate material P formed by the forming die 2 into a box shape is attached to the fixed frame 11 via a die slide means 5, which will be described later. Further, a pushing die 6 for pushing the plate material P formed by the forming die 2 into the cylindrical die 4 is provided so as to be horizontally movable toward the cylindrical die 4 while directly facing the cylindrical die 4. . The press mold 6 can be reciprocated by a cylinder 15 attached to a fixed frame 12. Further, above the cylindrical mold 4, a plate material supply means 7 is formed which supplies the plate materials P to the front surface of the cylindrical mold 4 by dropping them one by one.

The mold 2 that is characteristic of this invention is the first
As shown in detail in the figure, it is formed by combining four band-shaped thermal blades N in a grid pattern, and this thermal blade N has a predetermined length on one end as shown in Figure 2. A slide portion 20 having a notch 20a is formed, and a cross portion 21 having a groove 21a and a through hole 21b and having a contour shape into which the slide portion 20 can be inserted is formed on the other end side. The sliding portions 20 of each heating blade N are fitted with the cross portions 21 of other heating blades N intersecting with the sliding portion 20 of the heating blades N, so that the sliding portions 20 of each heating blade N are combined in a grid pattern. The sliding part 20 and the cross part 21 are fitted together by providing a predetermined gap so that the cross part 21 can slide along the notch 20a of the sliding part 20. Note that the sharp lower end portion 21b' of the through hole 21b formed in the cross portion 21 is cut out to the position of the cutting edge 22 of the heating blade N, so that the cutting edge 22 of each heating blade N can be arranged flush with each other. It's summery. In addition, the above heat blade N
A cartridge heater 23 is built in parallel to the cutting edge 22.

Furthermore, a corner blade 24 having a cutting edge 24a formed in a perpendicular direction is attached to the side surface of the cross portion 21 side end of each thermal blade N at the corner S of the four corners of the mold including the side surface.
It is installed along the This corner blade 24
is designed so that the cutting edge 24a protrudes beyond the cutting edge 22 of the hot blade N by a predetermined length.

With the above configuration, by pressing the forming die 2 heated by the heater 23 against the plate material P supplied to the front surface of the cylindrical die 4, the corner blade 24
By fusing the ear portion Z, the bending groove m can be formed by the cutting edge 22 of the hot blade N between the corner blades 24 (see FIG. 5). At this time, since the corner blade 24 is placed along the hot blade N, the heat of the hot blade N is efficiently transmitted to the corner blade 24, so that the temperature of the entire mold 2 can be easily maintained. .

The hot blade N is diagonally located at an intersection point K1,
Since it is movable in the X direction at K3 and in the Y direction at the other diagonal intersections K2 and K4, it is possible to freely adjust the distance L between the opposing hot blades N. At this time, since the corner blades 24 also move along with the hot blades N, the distance between the corner blades 24 can be adjusted at the same time. Therefore, many types of plate materials P can be molded with one mold 2.

As shown in detail in FIGS. 6 and 7, the mold slide means 3 behind the mold 2 is supported so as to be movable in the vertical direction by a pair of vertical guide shafts 31a, 31a provided on the fixed frame 12. a pair of vertical slide shafts 32a, 32a,
A pair of lateral slide shafts 32 are movably supported in the lateral direction by a pair of lateral guide shafts 31b, 31b, which are also provided on the fixed frame 12.
b, 32b are each configured, and
A mold mounting block 33 with a cross groove 33a is provided at the intersection of each of the sliding shafts 32a and 32b.
is slidably inserted. Further, the vertical slide shafts 32a, 32a are connected to the vertical guide shaft 3.
A pair of vertical feed screws 34 arranged in parallel at 1a and 31a
a, 34a, and the horizontal slide shafts 32b, 32b are screwed together with the horizontal guide shaft 3.
A pair of horizontal feed screws 34 arranged in parallel on 1b and 31b
b, 34b. The vertical feed screws 34a, 34a and the horizontal feed screws 34b, 3
4b has a reverse thread formed on the same axis, and its rotation drives the vertical slide shaft 3.
The mutual spacing between 2a and 32a and the mutual spacing between the lateral slide shafts 32b and 32b can be variably adjusted. The vertical feed screws 34a, 34a are
By rotating the vertical adjustment handle 35a configured on a predetermined portion of the outer periphery of the fixed frame 12, the transmission shaft 36
a, can be rotationally driven via a bevel gear mechanism 37a, etc., while lateral feed screws 34b, 34b
can be rotationally driven via a transmission shaft 36b, a bevel gear mechanism 37b, etc. by rotating a horizontal adjustment handle 35b configured close to the vertical adjustment handle 35a. As described above, by arranging both the adjustment handles 35a, 35b close to each other, the vertical slide shafts 32a, 32
a. Each movement adjustment of the horizontal slide shafts 32b, 32b can be easily performed without requiring unnecessary movements.

Each hot blade N of the mold 2 is fixed to a mold mounting block 33 via a heat insulating material 38 and a mold mounting plate 39. The mold mounting plate 39 has an intersecting insertion portion 39a formed at a location corresponding to the concave groove 21a of the cross portion 21 of the thermal blade N.
It is fixedly fitted into the cross groove 33a of the mold mounting block 33. With the above configuration, the distance between the opposing hot blades N of the mold 2 can be arbitrarily set by rotating the vertical adjustment handle 35a and the horizontal adjustment handle 35b.

Next, as the cylindrical mold 4 directly facing the mold 2,
As shown in FIGS. 8 and 9, four frame members W each having an L-shaped cross section and having a side wall W1 formed at one end are combined into a frame shape, and each frame member W has a side wall W1.
is slidably abutted against the lateral portion W2 of another frame member W, so that the distance between the opposing frame members W can be freely and variably adjusted. The mutually assembled state of the frame members W is maintained by the mold sliding means 5, and details regarding this point will be described later. Note that a slide groove 41 of a predetermined length is formed at a location where each frame member lateral portion W2 abuts against the side wall W1.

A positioning means 8 for positioning the plate material P supplied by the plate material supplying means 7 is formed on the front surface of the cylindrical shape 4 . The positioning means 8 includes a side guide plate 81 that guides one side of the plate P, a width shifting member 82 that directly faces the side guide plate 81, and a stopper 83 that receives the lower end of the plate P. Above the positioning means 8, upper guide plates 84, 84 are appropriately arranged. The width adjustment member 82 is configured to position the plate material P in the lateral direction by pressing the plate material P toward the side guide plate 81 side by driving the cylinder 82a, and the remaining vertical positioning is performed by the stopper 83. I can do it.

Furthermore, a suction hole 42 for vacuum suctioning the supplied plate material P is formed in the cylindrical shape 4 so as to correspond to the rear surface of the edge Z of the supplied plate material P. As shown in detail in FIGS. 10 and 11, this suction hole 42 has a suction nozzle 42 connected to a stepped elongated hole 43 for sliding formed on the front surface of the frame material W.
A is slidably inserted into the suction nozzle 42a, and an O-ring 42b is formed on the suction nozzle 42a as a suction part for the plate material P, and vacuum suction is performed through a pipe 42c connected to the back side. ing. With the above configuration, the suction hole 42 can be moved and adjusted along the elongated hole 43.
The suction holes 42 can be set at optimal positions depending on the plate material P. In addition, a groove closing member 44 for preventing the plate material P from being left uncut by the mold 2 is provided in the elongated hole 43 so as to be slidable and adjustable.

The mold slide means 5 formed behind the cylindrical mold 4 has the same structure as the mold slide means 3 for the mold 2, and is mounted on the fixed frame 11 as shown in FIGS. 12 and 13. A pair of vertical slide shafts 5 supported movably in the vertical direction by a pair of vertical guide shafts 51a, 51a provided in the
2a, 52a, and a pair of lateral slide shafts 52b, 52b supported movably in the lateral direction by a pair of lateral guide shafts 51b, 51b provided on the fixed frame 11, and each slide A cylindrical mounting block 53 with a groove 53a is slidably inserted into the intersection of the shafts 52a, 52b, and the vertical slide shafts 52a, 52a are connected to the vertical guide shaft 51.
A pair of vertical feed screws 54 arranged in parallel to a, 51a
a, 54a, and the horizontal slide shafts 52b, 52b are screwed together with the horizontal guide shaft 5.
A pair of horizontal feed screws 54 arranged in parallel on 1b and 51b
b, 54b. The vertical feed screws 54a, 54a and the horizontal feed screws 54b, 5
4b has a reverse thread formed on the same axis, and its rotation drives the vertical slide shaft 5.
The mutual spacing between 2a and 52a and the mutual spacing between lateral slide shafts 52b and 52b can be variably adjusted. The vertical feed screws 54a, 54a are
The transmission shaft 56 is rotated by rotating the vertical adjustment handle 55a formed on a predetermined portion of the outer periphery of the fixed frame 11.
a, can be rotationally driven via a bevel gear mechanism 57a, etc., while lateral feed screws 54b, 54b
can be rotationally driven via a transmission shaft 56b, a bevel gear mechanism 57b, etc. by rotating a horizontal adjustment handle 55b configured in proximity to the vertical adjustment handle 55a.

The side wall W1 of the frame member W and the lateral portion W2 that is in contact with the side wall W1 are each connected to a cylindrical mounting block 53.
is inserted into the groove 53a of the side wall W.
1 is attached to one side of the groove 53a by bolting, and the horizontal portion W2 is attached to the slide groove 4.
1 is inserted into the groove 53a so as to be slidable within the groove 53a. With the above configuration,
The combined state of the cylindrical molds 4 can be maintained by the mold sliding means 5, and the vertical adjustment handle 55
a and by rotating the horizontal adjustment handle 55b,
This means that the interval between the opposing frame members W can be set arbitrarily.

Next, the plate material supplying means 7 for dropping and supplying the plate material P onto the front surface of the cylindrical mold 4 will be explained with reference to FIGS. 3 and 8. As the plate material supply means 7, a tilting table 71 supported by the frame 16 is used.
Two side plates 72 whose mutual spacing can be adjusted are erected above, and above the tip of the ramp 71 is a shutter 7 which can be raised and lowered by a cylinder 73.
4, and a front plate 75 is provided in front of the shutter 74 with a predetermined gap between it and the tip of the inclined table 71, and on the inclined table 71, The plate materials P can be placed side by side in an upright manner. Plate material supply means 7 configured as above
According to the above, as the shutter 74 descends within the gap between the front plate 75 and the inclined table 71, the inclined table 71
The most advanced plate material P that has been pushed out along can be pushed down and dropped. In addition, an air injection means 76 for the falling plate material P is configured at a predetermined position in front of the front plate 75.
The material can be reliably dropped to the supply position while following the cylindrical mold 4 side.

Furthermore, an air injection nozzle 77 is formed on the front surface of the front plate 75 of the plate supply means 7 for removing the edge part Z of the plate P cut by the mold 2.

Behind the fixed frame 11, a cylindrical 4
A guide member 9 is formed for receiving and recovering the boxes discharged from the rear of the box. (3rd
(see figure).

As described above, according to the box making apparatus having the above configuration, the plate material supplying means 7 supplies the plate material P to the front surface of the cylindrical mold 4, and the positioning means 8 positions the plate material P at a predetermined position, and then the suction The plate material P can be suctioned and fixed by vacuum suction through the holes 42 . Then, the pushing mold 6 is advanced toward the cylindrical mold 4 side, and is lightly brought into contact with the plate material P. With the plate material P more securely fixed, the mold 2 is advanced toward the cylindrical mold 4 side and the plate material P is pressed against the plate material P. By pressing, the bending groove m can be formed by melting and the edge part Z can be melted and cut.

Furthermore, after retracting the forming die 2, the pushing die 6 is further advanced, and the central part of the plate material P, excluding the cut ear part Z, is pushed into the cylindrical die 4. It is possible to manufacture a box into a rectangular box shape by bending it from the bending groove m along the inner wall of the box.
Then, the ear portion Z remaining on the cylindrical shape 4 is the suction hole 42.
By injecting compressed air from the air injection nozzle 77 for removing the ears at the same time as releasing the vacuum suction, the ears can be blown outward from the lower part of the cylindrical mold 4 and removed.

When changing the setup, each adjustment handle 35a, 35b, 55 of the mold slide means 3, 5
By rotating a and 55b, the mold 2
Also, the molding dimensions of the cylindrical mold 4 can be changed quickly.

It should be noted that the mold 2 of this invention can of course be attached and used not only in the above-described horizontal type box forming apparatus but also in a vertical type box forming apparatus.

<Effects> As described above, the mold for assembled boxes of this invention can variably adjust the distance between the opposing hot blades, so it is possible to mold many types of board materials for boxes with one mold. Compared to the conventional method of changing molds for each product type, setup changeover time is significantly reduced (approximately 1/7)
In addition, since there is no need to prepare a mold for each product type, mold costs can be significantly reduced, and this can contribute to reducing the cost of assembled boxes.

In particular, since the corner blades are attached along the four corners of the mold, it is easy to maintain the temperature of the entire mold, and molding can always be performed under suitable conditions.

Furthermore, according to this invention, by changing the distance between the opposing thermal blades, the corner blades also automatically slide along with it, which eliminates the need for setting only the corner blades, making it easier to change setups. This has the advantage of simplifying the work and significantly reducing the time required for changeovers.

In addition, since there is no need to replace the mold, damage to the mold can be prevented, and there is no need to transport heavy molds, which is good from a safety perspective.
It has various excellent practical effects.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the mold of this invention, Fig. 2 is a perspective view of the hot blade constituting the mold, and Fig. 3 is a front view showing the entire box making device equipped with the mold of this invention. FIG. 4 is a right side view, FIG. 5 is a perspective view of the plate material formed by the mold, FIG. 6 is a left side view of the slide means for the mold, and FIG. 7 is a plan view. FIG. 8 is a perspective view of the cylindrical shape and the vicinity of the plate supply means, FIG. 9 is a perspective view of the cylindrical shape seen from the back, and FIG. 10 is an enlarged view of the main parts showing the suction hole for vacuum suction.
FIG. 11 is a front sectional view taken along line X-X, FIG. 12 is a right side view of a mold slide means for a cylindrical mold, FIG. 13 is a plan view, and FIG. 14 is a perspective view of a conventional mold. 2... Molding die, 20... Slide part, 20a...
...cut, 21...cross portion, 24...corner blade, 24a...cutting blade, N...thermal blade constituting the mold, P...plate material.

Claims (1)

[Scope of utility model registration request] Four thermal blades each having a sliding part with a notch of a predetermined length at one end and a cross part having a notch with a contour shape into which the sliding part can be inserted at the other end are heated. The cross section of another thermal blade is slidably fitted into the sliding section of the blade and combined in a parallel cross shape, and the cutting edge is installed in the right angle direction on the side of the cross section side end of each thermal blade. A mold for box making, characterized in that the formed corner blades are attached along the four corners of the mold including the side surfaces.