Box assembly device and method of assembling box

1. A box assembly device configured to assemble a box material having four side boards continuously provided via score lines, bottom boards provided to lower sides of a pair of side boards opposing to each other among the four side boards, and bottom flaps provided to lower sides of the other pair of side boards, the box assembly device comprising:

a robot body having a holding mechanism configured to hold the box material, a folding mechanism configured to fold the bottom flaps of the box material inside, and a robotic arm to which the holding mechanism and the folding mechanism are attached;

a control device configured to control operation of the robot body;

a first jig fixedly installed; and

a second jig fixedly installed to oppose the first jig, wherein:

while the holding mechanism holding the box material in a state where the box material is formed into a cylindrical shape from a folded state, the holding mechanism causes one of the bottom boards to contact the first jig to fold the bottom board inside,

the folding mechanism folds the bottom flaps inside to overlap with the one of the bottom boards, and

the holding mechanism causes the other bottom board to contact the second jig while holding the box material and folds the other bottom board inside to overlap with the bottom flaps to engage the bottom boards with each other.

2. The box assembly device of claim 1 , wherein the holding mechanism includes:

a base part;

a rotary joint having a horizontal rotation axis;

a tip-end part rotatably coupled to the base part through the rotary joint;

a holding part provided to the tip-end part and configured to hold the box material in the folded state; and

a first bending part configured to develop the box material into the cylindrical shape by bending the box material held by the holding part.

3. The box assembly device of claim 1 , wherein the folding mechanism includes:

a base part;

a supporting part provided to the base part and configured to support the box material formed into in the cylindrical shape; and

a first bending part configured to fold the bottom flaps of the box material supported by the supporting part inside.

4. A box assembly device configured to assemble a box material having four side boards continuously provided via score lines, bottom boards provided to lower sides of a pair of side boards opposing to each other among the four side boards, and bottom flaps provided to lower sides of the other pair of side boards, the box assembly device comprising:

a robot body having a holding mechanism configured to hold the box material, a folding mechanism configured to fold the bottom flaps of the box material inside, and a robotic arm to which the holding mechanism and the folding mechanism are attached;

a control device configured to control operation of the robot body;

a first jig fixedly installed;

a second jig fixedly installed to oppose the first jig; and

a blow mechanism fixedly installed between the first jig and the second jig and configured to blow air, wherein:

while the holding mechanism holding the box material in a state where the box material is formed into a cylindrical shape from a folded state, the holding mechanism causes one of the bottom boards to contact the first jig to fold the bottom board inside,

the folding mechanism folds the bottom flaps inside to overlap with the one of the bottom boards,

the holding mechanism causes the other bottom board to contact the second jig while holding the box material and folds the other bottom board inside to overlap with the bottom flaps to engage the bottom boards with each other,

the blow mechanism blows air to each of the bottom flaps of the box material located above a space between the first jig and the second jig to spread the respective bottom flap outside, and

while the holding mechanism holds the box material of which the bottom flap is spread outside, the holding mechanism causes one of the bottom boards to contact the first jig and folds the bottom board inside.

5. A method of assembling a box by a box assembly device configured to assemble the box from a box material having four side boards continuously provided via score lines, bottom boards provided to lower sides of a pair of side boards opposing to each other among the four side boards, and bottom flaps provided to lower sides of the other pair of side boards, the box assembly device including:

a robot body having a holding mechanism configured to hold the box material, a folding mechanism configured to fold the bottom flaps of the box material inside, and a robotic arm to which the holding mechanism and the folding mechanism are attached;

a control device configured to control operation of the robot body;

a first jig fixedly installed; and

a second jig fixedly installed to oppose the first jig,

the method of assembling the box comprising the steps of:

while holding, by the holding mechanism, the box material in a state where the box material is formed into a cylindrical shape from a folded state, causing one of the bottom boards to contact the first jig and folding the bottom board inside;

folding, by the folding mechanism, the bottom flaps inside to overlap with the one of the bottom boards; and

causing, by the holding mechanism, the other bottom board to contact the second jig while holding the box material, and folding the other bottom board inside and upwardly to overlap with the bottom flaps to engage the bottom boards with each other.

6. A box assembly device configured to assemble a box material having a bottom board and four side boards continuously provided via score lines to the bottom board, the box assembly device comprising:

a robot body having a holding mechanism configured to hold the box material, a pressing mechanism configured to press against the box material, and a robotic arm to which the holding mechanism and the pressing mechanism are attached;

a control device configured to control operation of the robot body; and

a frame jig fixedly installed and conforming to a shape of the bottom board of the box, wherein:

while the holding mechanism holds the box material in a state where the bottom board and the four side boards are in a flat board shape, the holding mechanism places the box material on the frame jig, and

the pressing mechanism presses from above against the bottom board of the box material disposed on the frame jig to fold the side boards with respect to the bottom board at score lines.

7. A box assembly device configured to assemble a box material having a bottom board and four side boards continuously provided via score lines to the bottom board, the box assembly device comprising:

a robot body having a holding mechanism configured to hold the box material, a pressing mechanism configured to press against the box material, and a robotic arm to which the holding mechanism and the pressing mechanism are attached;

a control device configured to control operation of the robot body; and

a frame jig fixedly installed and conforming to a shape of the bottom board of the box, wherein:

while the holding mechanism holding the box material in a state where the bottom board and the four side boards are developed in a flat board shape, the holding mechanism places the box material on the frame jig,

the pressing mechanism presses from above against the bottom board of the box material disposed on the frame jig to fold the side boards with respect to the bottom board at score lines,

the pressing mechanism includes:

a first surface part configured to press against the box material from above; and

a second surface part configured to press against the box material from a side direction,

the first surface part is pressed from above against the bottom board of the box material disposed on the frame jig to fold the side board upwardly with respect to the bottom board at the score line to form the bottom of the box,

the second surface part is pressed from the side direction against the side board folded upwardly with respect to the bottom board at the score line to fold the side board inside, and

the first surface part is pressed from above against the side board folded inwardly to fold the side board downwardly toward the bottom board to form a side part of the box.

8. A method of assembling a box by a box assembly device configured to assemble the box from a box material having a bottom board and four side boards continuously provided via score lines to the bottom board, the box assembly device including:

a robot body having a holding mechanism configured to hold the box material, a pressing mechanism configured to press against the box material, and a robotic arm to which the holding mechanism and the pressing mechanism are attached;

a control device configured to control operation of the robot body; and

a frame jig fixedly installed and conforming to a shape of the bottom board of the box, the method of assembling the box comprising:

while holding, by the holding mechanism, the box material in a state where the bottom board and the four side boards are in a flat board shape, the holding mechanism places the box material on the frame jig, and

pressing, by the pressing mechanism, from above against the bottom board of the box material disposed on the frame jig to fold the side boards with respect to the bottom board at the score lines to form the bottom of the box.