JPH11105127A - Method and apparatus for manufacturing folding box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically give a pushing force between end faces of sidewall material at the time of fixing by folding two triangular grooves, urging a sidewall member between movable members to form a three-way wall, then folding the residual triangular groove, heating to melt the end faces of the sidewall material one another by a heating platen, transferring the movable members to opposite side and pushing the end faces. SOLUTION: Sidewall materials 1 pushed between movable arms 5 from a supply port 16 by a piston 4 fold two triangular grooves 3 of a center side and push it to positions of stoppers 6 provided at an inside lower parts of the arms 5. Then, bent arms 7 are inclined to inside, and the materials 1 are molded by utilizing the residual triangular groove. At this time, a heating platen 9 is advanced to heat to melt the end faces 2 of the materials 1. Then, the platen 9 is retracted. Simultaneously, the end faces 2 of the materials of melted state are pushed by the arms 5 and welded to one another.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a folding box in which a side wall made of a foamed synthetic resin is bent along a triangular groove formed at right angles to the longitudinal direction, and the end faces of the frame are fixed by heating and melting with a hot plate. The present invention relates to a method and a manufacturing apparatus.

[0002]

2. Description of the Related Art When fixing end portions of side wall materials in a folding box of this type, for example, the one disclosed by the applicant in Japanese Patent Application Laid-Open No. 7-232726 has been put to practical use. In this technique, the paper is folded to form a side wall material and the ends thereof are fixed with an adhesive.However, a paper material having both end surfaces formed into symmetrical irregularities is formed by folding the paper material to form a side wall material. At the bent stage, the end faces are fitted with each other in an uneven manner so that a sufficient bonding area is secured, and the end faces of the side wall material can be firmly bonded.

[0003] In general-purpose inexpensive folding boxes, side walls made of a synthetic resin foam are used. However, if the above-described unevenness is to be applied to the end surface of the side walls, it is necessary to separately perform cutting. is there. This requires additional man-hours and costs, and is currently not employed in the manufacture of folded boxes. In the side wall material made of foam synthetic resin,
A triangular groove is formed at right angles to the longitudinal direction, and an inclined surface is formed on the end surface. This is bent by the triangular groove, and the inclined surfaces on the end surface are fixed with an adhesive or melted by heating using a hot plate and welded. The method has been adopted. However, in order to exert an adhesive force between the end surfaces having a small area by curing the welded portion, it is necessary to press the plate for a certain time while applying a delicate pressing force, which hinders automation of folding box production. Will be.

[0004]

The present invention relates to a folding box in which a side wall material made of a foamed synthetic resin is bent along a triangular groove formed at right angles to the longitudinal direction, and the end faces of the frame material are heated and melted by a hot plate to be fixed. In a manufacturing method and a manufacturing apparatus, it is an object to automatically apply a delicate pressing force between end faces of a side wall material at the time of fixing.

[0005]

[Technical Means] The first technical means for solving this technical problem relates to a method for manufacturing a folding box.
After bending the two triangular grooves and pushing the side wall member between the opposing movable members to form a three-sided wall, (b) bending the remaining triangular grooves to connect the end faces of the side wall material to the hot plate (C) Retreat the hot plate whose end face is heated and melted,
(D) Simultaneously shift the movable member to the other side and press the end surface. The second technical means relates to an apparatus for manufacturing a folding box, (e) a movable arm whose lower end is pivotally connected to a turntable to enable inward tilting, and (f) a side wall material between the movable arms. Push-in member that pushes in while bending it with a triangular groove, (g) a bending arm arranged above one or both movable arms, (h) a cam arranged outside the turntable, and (iii) outside the movable arm. (E) a link mechanism interposed between the upper part of the elevating rod and the bending arm, and (j) an engaging projection protruding from an intermediate portion of the elevating rod. (ヲ) After the hot plate is retracted, the turntable is rotated to slightly raise the elevating rod, so that the engaging projection directly or indirectly pushes the movable arm to tilt inward. ,.

In the first technical means, the side wall member having the triangular groove formed at right angles to the longitudinal direction is bent between the two triangular grooves and pushed into between the opposing movable members. Are formed. Next, when the remaining triangular grooves are bent so that the end surfaces of the side wall members face each other, the weld portions are formed. When welding is performed at the corner of the folding box, the number of remaining triangular grooves to be bent is one, and when welding is performed at the middle part of the side wall, the number of remaining triangular grooves to be bent is two. When the end faces face each other via the hot plate and the end faces are heated and melted, the preparation stage for welding is completed. Then, when the hot plate is retracted and the movable member is moved to the other side, the end surfaces of the side wall members are pressed with the melted end surfaces in contact with each other, and a delicate pressing force is applied to the end surfaces to fuse them together. Will do.

When the end faces of the side wall members are brought into face-to-face contact, guide members may be arranged as necessary so that the side wall members can be brought into face-to-face contact. In addition, using a side wall material having a triangular groove formed at right angles to the longitudinal direction and forming a concave groove along the longitudinal side edge, forming a three-way wall, inserting the bottom plate into the concave groove, and then leaving the remaining plate When the triangular grooves are bent and the end faces of the side wall members are welded, the bottom plate can be attached simultaneously with the bending of the side wall members.

[0008] In the folding box manufacturing apparatus, the movable member in the first technical means is constituted by an upright arm,
The lower end is pivotally attached to the turntable to enable inward tilting. The side wall material is supplied above the movable arm with the side provided with the triangular groove as an upper surface, and the triangular groove is bent while being pushed between the movable arms by a pushing member, thereby forming a three-sided wall of the side wall. The bending arm arranged above the movable arm depends on the position of the welding part, that is, when welding at the corner of the folding box, one bending arm is sufficient,
In the case of welding at the middle part of the side wall, the bending arm needs to be arranged above both movable arms.

The elevating rod arranged outside the movable arm is moved up and down by engagement with a cam arranged outside the turntable. A link mechanism is interposed between the upper part of the lifting rod and the bending arm, and the bending arm operates in response to the lifting of the lifting rod. The cam is arranged above or below the turntable, but it can be designed to be arranged beside the turntable and to raise and lower the lift rod via an appropriate connection mechanism. Further, when operating the bending arm, any of a method of operating the arm by raising and lowering the raising and lowering rod and a method of operating by lowering the arm may be adopted, but in the present specification, for convenience of explanation, the former method is used. Explains.

When the turntable is rotated after the end faces of the side wall members facing each other with the hot plate interposed therebetween are heated, the lifting rod engaged with the cam rises. When the engaging projection protruding from the middle part of the lifting rod directly or indirectly presses the movable arm to tilt inward, the end faces of the bent side wall material come into contact with each other in a molten state. As a result, the end faces are welded with a slight pressing force. By providing a projection on the outside of the movable arm with which the engagement projection abuts, the arm is directly tilted by the engagement projection, and is moved between the lifting rod and the movable arm by the engagement projection of the lifting rod. The arm is indirectly tilted if the pusher to be moved is arranged and placed. If the side wall material is removed from the movable arm when the welded portion is hardened, the side wall of the folding box is completed, and then the bottom box is glued to the bottom plate with glue or the like to form a folding box. It is to be noted that, similarly to the first technical means, a side wall with a bottom plate can be obtained by using a side wall material having a concave groove.

[0011]

According to the present invention, there is an advantage that the side wall material made of a foamed synthetic resin can be bent automatically and quickly by mechanically applying a slight pressing force when the end face of the side wall material is fixed.

[0012]

FIG. 1 is a schematic front view of a movable arm 5 as a movable member for receiving a side wall member 1 made of expanded polypropylene which is pushed in while being bent. The arms 5, 5 have their base ends pivotally attached to a bent portion 11 arranged along a side edge of a rectangular turntable 10 (described later) (see FIG. 5), so that the arms 5, 5 can tilt to each other's arm. Supported and supported. In this embodiment, since the end surfaces 2 and 2 of the side wall member 1 are welded to each other at the center of the side edge of the box, the triangular groove 3 for folding the side wall member 1 is formed at right angles to its longitudinal direction. The book is formed.

Above the movable arms 5, 5, a supply section 12 for the side walls 1 is arranged, and the side walls 1 stacked on the stocker 13 are separated one by one by pushing means (not shown). Extruded up. The side wall member 1 pushed between the movable arms 5 and 5 by the piston 4 as a pushing member from the supply port 16 formed at the center of the supply 15 is in a state where the two triangular grooves 3 on the center side are bent. Then, the movable arms 5, 5 are pushed to the positions of the stoppers 6, 6, which are arranged at the lower portion inside (see FIG. 2). The stopper is mounted so that its position can be changed according to the length of the side wall of the box.

When the piston 4 retreats, the turntable 10 rotates by 90 degrees in the direction of arrow b and stops, and the next side wall member 1 is sequentially pushed into the adjacent movable arm. Turntable 1
When the rotation starts, the bending arm, which is arranged above the movable arms 5 and 5 and whose base end is pivotally attached to the support on the turntable, is tilted inward, and the side wall is formed using the remaining triangular groove. Lumber 1
Is bent. At this time, the hot platen 9 moves forward and faces the facing portions of the end surfaces 2 and 2 of the side wall material, and the end surfaces 2 and 2 face each other via the hot platen 9 (see FIG. 3). At the stage where both end surfaces 2 and 2 are melted by heating of the hot platen 9, the hot platen 9 retreats, and at the same time, the movable arms 5 and 5 tilt in the direction of the arrow a to move the end surfaces 2 and 2 of the molten side wall material together. It presses and it welds both (refer FIG. 4). Thereafter, the turntable 10 is further rotated to return the movable arms 5 and 5 and the bending arms 7 and 7 to their original positions, and the side wall material 1 is pushed out from the center of the turntable 10 by a protrusion mechanism (not shown), thereby forming a side wall of the folding box. The part is manufactured, and then the bottom plate is attached to complete the folding box.

Next, a mechanism for tilting the movable arm 5 and tilting the bending arm 7 will be described with reference to FIGS. A circular cam 15 having irregularities on its surface is disposed below the turntable 10. The tilting of the movable arm and the tilting of the bending arm disposed above the movable arm are performed by the cam 1.
5 is performed. Each movable arm 5 is kept upright by a spring 20. On the outer side of the movable arm 5, an elevating rod 21 is supported by guides 22 and 22 and is urged downward by a spring 23.
A mover 24 is fitted between the upper end of each elevating rod 21 and a spring 23, and the mover 24 and the pivotal joint of the bending arm 7 are connected by link rods 25 and 26. Double lifting rod 2
Numerals 1 and 21 are connected at a lower portion, and a slider 27 that moves while sliding on a cam surface downward from the connection portion is protruded toward a lower end portion.

When the turntable 10 rotates and the slider 27 moves to the convex portion of the cam 15, the lifting rod 21 rises, the movable element 24 is lifted, and the link rods 25 and 26 are bent to move the bending arm 7. (FIGS. 3 and 7A)
reference). At this time, the link rods 25 and 26 are in contact with the stopper 19 at the bent portions. Turntable 10
When the slider 27 still rotates and shifts from the state A of FIG. 7 to the state B, and the slider 27 rides on the next convex portion, the lifting rod 21 further rises. However, since the upward movement of the bent portion of the link rod is restricted by the stopper 19,
The mover 24 remains stationary, and the lift rod 21 rises against the force of the spring 23. At this stage, the projection 28 protruding from the middle portion of the lifting rod engages with the projection 8 protruding outside the movable arm, and slightly pushes this inward to tilt the movable arm 5 (FIG. 4, see FIG. 7B).

In the above-described apparatus, the hot platen 9 is moved forward and backward using a solenoid. However, the hot platen 9 can also be moved forward and backward using a cam surface. It goes without saying that the lifting rod can be raised and lowered by using wheels and rollers instead of the slider moving on the cam. Note that the tilting width of the movable arm can be extended depending on the position and shape of the engaging projection 28 of the elevating rod 21 and the projection 8 of the movable arm 5. Each arm operates with the first intermittent rotation,
The operating position can be changed by appropriately designing the uneven position of the cam surface. In this case, the welding of the end face of the side wall material must be completed and discharged from the movable arm by one rotation.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a movable arm before pushing a side wall material.

FIG. 2 is a schematic front view of a movable arm in a state where a side wall material is pushed in.

FIG. 3 is a schematic front view of the movable arm in a state where the end surfaces of the side wall members face each other via a hot plate;

FIG. 4 is a schematic front view of a movable arm in a state where an end face of a side wall material is welded.

FIG. 5 is a plan view of a turntable.

FIG. 6 is a schematic front view of a movable arm having a drive mechanism.

FIG. 7 is a schematic view of a main part showing a tilted state of a movable arm.

[Explanation of symbols]

1 side wall material, 4 (pushing) piston, 5 movable arm, 7 bending arm, 8 convex portion, 9 hot platen, 10 turntable, 11 processing section, 12 side wall material supply device, 21 elevating rod, 23 spring, 25, 26 Link rod, 28 engagement projection,

Claims (3)

[Claims] 1. A method of manufacturing a folding box, comprising: bending a side wall material made of a foamed synthetic resin along a triangular groove formed at right angles to a longitudinal direction and heating and melting the end faces of the frame material by a hot plate to fix them. After bending the two triangular grooves and pushing the side wall member between the opposing movable members to form a three-way wall, the remaining triangular grooves are bent and the end faces of the side wall material face each other via the hot plate A method of manufacturing a folding box in which the hot plate whose end face is heated and melted is retracted, and at the same time, the movable member is moved to the other side to press the end face. 2. A groove is formed along a longitudinal side edge of the side wall material, a bottom plate is inserted into the groove after forming a three-way wall, and then the remaining triangular groove is bent. The method for manufacturing the folded box described in the above. 3. A folding box manufacturing apparatus in which a side wall material made of a foamed synthetic resin is bent along a triangular groove formed at right angles to the longitudinal direction, and the end faces of the frame material are heated and melted and fixed by a hot plate. A movable arm whose lower end is pivotally attached to a turntable to allow inward tilting, a push-in member for pushing a side wall material between the movable arms while bending the side wall material with a triangular groove, or above one or both movable arms Arm, cam arranged outside the rotary table, elevating rod arranged outside the movable arm to move up and down by engagement with the cam surface, link mechanism interposed between the upper part of the elevating rod and the bending arm , Consisting of an engaging projection protruding from the middle part of the lifting rod, rotating the turntable after retracting the heating plate and slightly raising the lifting rod, whereby the engaging projection directly or indirectly presses the movable arm. Then A folding box manufacturing device that tilts to the right.