JP2002234086A - Method for forming cylindrical container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely open a carton (11) into an aimed shape in a method for forming a cylindrical container by which the carton (11) flat folded is formed into a cylindrical shape with both open ends and lid bodies are inserted into the opened parts of the end part of the cylindrically formed carton. SOLUTION: A suction process in which the surface and the back surface of the flat folded carton (11) are respectively sucked by means of the first suction head (34) and the second suction head (32), a carton half opening process in which the first suction head (34) and the second suction head (32) are relatively separated under the sucked condition, a preliminary forming process in which mandrels (41) and (42) with outer peripheral shapes which coincide with or are closely analogous to the final inner peripheral shape of the carton are pushed into the opened parts of the end part of the carton under the half opened condition, a carton holding process in which the outer periphery of the carton (11) into which the mandrels (41) and (42) are pushed is held by means of carton holding tools (51) and (52), a mandrel drawing-out process in which after the carton holding process, the mandrels (41) and (42) are drawn out from the carton (11) and a lid inserting process in which the lid bodies are inserted into the opened parts of the end part of the carton (11) are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for forming a cylindrical container.

[0002]

2. Description of the Related Art As an invention relating to this seed molding method, the invention of Japanese Patent Application No. 2000-113029 has already been proposed.
An apparatus for performing this molding method has a configuration shown in FIG. Carton magazine (12) with stacked cartons
(11) While (11) group is loaded, Carton Magazine
In the vicinity of the carton outlet (16) that opens below (12),
Take-out sucker (14) that moves toward and away from the carton discharge port (16)
Are arranged. A relay suction cup (17) for receiving the carton (11) from the suction cup (14) and supplying it to the carton holder (23) is provided above the moving area of the suction cup (14). It is established. And the above carton holder
(23) includes clamping blocks (21) and (22) for clamping the carton (11) in the opening direction. In addition, Carton Magazine (1
The carton (11) loaded in (2) has a shape obtained by flattening a cylindrical body open at both ends.

In this apparatus, a carton (11) is taken out of a carton magazine (12) and taken out by a suction cup (14), and a carton (11a) adsorbed and held on the suction cup (14).
Is held again by the relay suction cup (17), and the carton (11b) held by the relay suction cup (17) is transferred to the open carton holder (23). Then, the flattened cartons (11c) are sandwiched by the sandwiching blocks (21) and (22) in a direction in which the folded edges of both sides approach each other, whereby the cartons (11c) are indicated by solid lines in FIG. Open like a cylinder. Thereafter, glue is applied to the inner periphery of one end opening portion of the carton (11d) opened in a cylindrical shape, and a circular lid is fitted, whereby a cylindrical container having one end covered with the circular lid is completed.

[0004]

However, the above-mentioned prior art has the following problems.

[0005] The carton (11) in the flat state is brought close to the folded edges on both sides of the carton (11).
Only allows the natural opening of the cylindrical shape, the opening may not be formed in an accurate cylindrical shape, and the occurrence rate of defective products increases.

Further, in the above-described conventional apparatus, since the carton (11) only allows the spontaneous opening as described above, it can be formed into various shapes such as a square tube and a triangular tube. Can not.

[0007] The present invention has been made in view of the above points,
Carton (11) in the `` Method of forming a cylindrical container in which a flat folded carton is formed into a cylindrical shape with both ends open and a lid is fitted into an open end portion of the cylindrically shaped carton '' It is an object of the present invention to make it possible to form a cylindrical container having various cross-sectional shapes while improving the yield by reliably opening the target container to a target shape.

[0008]

Means for Solving the Problems [1] The technical means of the present invention for solving the above-mentioned problem is that "the flat and folded cartons have a first suction head and a second suction head. And a carton half-opening step of bringing the carton into a half-open state by relatively separating the first suction head and the second suction head in the suction state. A preforming step of pushing a mandrel having an outer peripheral shape that matches or approximates the final inner peripheral shape of the carton into the open end portion of the carton,
A carton holding step of holding the outer periphery of the carton with a carton holding tool so that the shape of the carton in which the mandrel is pushed is maintained, and a mandrel pulling step of pulling out the mandrel from the carton after the carton holding step. And a lid fitting step of fitting a lid body into the open end portion of the carton after the mandrel pulling-out step.

According to the above technical means, after performing a suction step of separately sucking the front and back surfaces of the flatly folded carton with the first and second suction heads, the first and second suction heads are removed. When they are separated from each other, the carton is brought into a half-open state (carton half-opening step). Next, when a mandrel having an outer peripheral shape that matches or approximates the final inner peripheral shape of the carton is pushed into the end opening portion of the half-opened carton, the carton opens to the final cross-sectional shape or a shape similar thereto ( Preforming step).

Next, the outer periphery of the carton is held by a carton holder so that the shape of the carton while the mandrel is pushed in can be maintained. In this state, when the drawing step of pulling out the mandrel from the end of the carton is executed, the carton is held in the carton holder in the final outer peripheral shape or a shape similar thereto.

Therefore, a lid fitting step of fitting the lid into the open end of the carton is performed. In addition, when the carton is not opened to the final outer peripheral shape and is opened only to a shape approximate to the final outer peripheral shape, when the lid is forcibly fitted into the end opening portion of the carton, The carton is deformed into a shape along the outer periphery of the lid. That is, the carton is formed into a final outer peripheral shape when the lid is fitted. This allows
A cylindrical container in which the open end of the carton is closed by the lid is completed. When the lid is fitted, adhesive glue may be applied in advance to the inner periphery of the open end of the carton,
The lid may be pressed into the open portion without applying the adhesive.

[2] In the item [1], in the item [1], wherein the carton holder holds an outer peripheral portion of the carton with an inner peripheral surface corresponding to a final outer peripheral shape of the carton. The outer periphery of the carton is held by the carton holder while the mandrel is pushed into the opening. Then, since the inner peripheral surface of the carton holder matches the final outer peripheral shape of the carton, the outer periphery of the carton becomes the final outer peripheral shape along the inner periphery of the carton holder during the holding.

[3] In the above item [1] or [2], in "the mandrel has a tapered insertion-side tip with respect to the carton", the tapered tip of the mandrel is partially opened. The mandrel pushes smoothly because it enters the open end of the carton in a wedge shape.

[4] In the item [1] to [3], as the carton holding member, an annular frame which moves from a rear side in a pushing direction of the mandrel pushed into the carton to a position outside the carton is adopted. In addition, "the carton holder is composed of a pair of halves fitted onto the carton from the radial outside of the carton."
Things can also be adopted.

[0015]

The present invention has the following specific effects. Since the carton retainer is fitted around the outer periphery of the carton while the mandrel is pushed into the open end of the carton, the carton can be surely formed into the final shape, and the yield is higher than the conventional one described above. Get better. By employing mandrels and carton holders of various shapes, cylindrical containers having various shapes such as cylinders and rectangular cylinders can be formed.

According to the second aspect, since the carton is held by the carton holder having an inner peripheral surface corresponding to the final outer peripheral shape of the carton, the carton is accurately formed into the final outer peripheral shape by the holding. . Therefore, the work of fitting the cover plate into the end of the carton can be performed smoothly. In the item (3), the mandrel can be smoothly pushed into the carton by the guiding action of the tapered tip of the mandrel.

[0017]

Next, an embodiment of the present invention will be described. As shown in FIG. 1, an apparatus for forming a cylindrical container according to an embodiment of the present invention comprises a carton magazine (31) for stocking cartons (11) and (11) groups sequentially superposed in a horizontal direction, and the carton magazine (31). A carton take-out arm (33) for taking out the carton (11) from the magazine (31), and an opening arm (35) for cooperating with the carton take-out arm (33) to half-open the carton (11) into an elliptical cylindrical shape; A pair of upper and lower mandrels (41) and (42) inserted into the open ends of the carton (11) that is half-opened into the elliptical cylindrical shape, and an outer periphery of the carton (11) into which the mandrels (41) and (42) are fitted. Holding frames (51) and (52), which are carton holders for holding the frame. Hereinafter, details of each unit will be described.

[Carton magazine (31) and carton (11)
The carton magazine (31) has a carton loading groove (36) that opens upward, and the cartons (11) and (11) are loaded in the carton loading groove (36) in an overlapping state. . Then, the engaging claws (37) (37) bent inward from the periphery of the carton discharge port (30) are engaged with the carton (11) located at the carton discharge port (30) portion, Inadvertent escape of the carton (11) from the carton outlet (30) is prevented. Also, Carton Magazine (31)
Inside, a spring device (not shown) for pushing the cartons (11) and (11) from the back side to the carton discharge port (30) side is provided.

The folded carton (11) loaded in the carton magazine (31) is formed by folding a pair of opposing sides of a rectangular paper sheet into two so as to overlap each other. A pair of overlapped sides is glued. Then, from this carton (11), a cylindrical container having a shape such as a cylinder, a rectangular cylinder, an elliptical cylinder or the like is formed.

[Regarding Carton Take-Out Arm (33) and Opening Arm (35)] The carton take-out arm (33)
A Y-shaped pipe (38) provided with a first suction cup (34) (34) as a first suction head is provided at a branch tip, and the Y-shaped pipe (38) is connected to a vacuum device (not shown) by a rubber device. When the vacuum device is operated, the inside of the Y-shaped pipe (38) is in a negative pressure state and the first suction cups (34) (34) can adsorb the carton (11). .

The carton take-out arm (33) is connected to the carton (11) at the carton outlet (30) of the carton magazine (12).
And a carton suction position (an imaginary line in FIG. 1) for adsorbing the ink, and 90 points along the circular locus in the horizontal direction from the carton suction position.
Carton forming position (the position shown by the solid line in FIG. 1)
It can move back and forth between

An opening arm (35) is provided at a position facing the carton take-out arm (33) moved to the carton forming position indicated by the solid line in FIG. 1, and the opening arm (35) is A second suction head, a second suction head, is
It has a Y-shaped pipe (39) to which suction cups (32) and (32) are attached, and the Y-shaped pipe (39) is not shown similarly to the other Y-shaped pipe (38) described above. It is connected to the vacuum device by a rubber tube or the like. Therefore, when the vacuum device is operated, the inside of the Y-shaped pipe (39) is in a negative pressure state, and the surface of the carton (11) can be adsorbed by the second suction cups (32, 32).

The opening arm (35) can reciprocate between a retracted position shown in FIG. 1 and an advanced position in contact with the surface of the carton (11) held by the carton take-out arm (33). It has become. Accordingly, the opening arm (35) is moved from the retracted position shown by the solid line in FIG. 1 to the advanced position, and the second suction cups (32) (32) and the carton take-out arm (33) of the opening arm (35) are moved. Carton (11) with the first sucker (34) (34)
When the opening arm (35) is slightly retracted toward the retracted position, the carton (11) is half-opened into an elliptical cylindrical shape as shown in FIG.

[About Mandrels (41) and (42)] Mandrels
(41) and (42) are forcibly pushed into both ends of the carton (11) to open the carton (11) to a final shape, and therefore, the mandrel employed in the present embodiment.
(41) The diameter of (42) is a carton with a perfect cylindrical opening
It is set to a size equal to or slightly smaller than the inner diameter of (11), and the tapered end portions (43) and (44) of the mandrels (41) and (42) have a shape obtained by cutting off the tips of the cones. ing. Thereby, the outer peripheral shape of the mandrels (41) and (42) is formed in a shape that matches or approximates the final outer peripheral shape of the carton (11). The mandrels (41) and (42) are reciprocated by a driving source (not shown) in a direction of relatively coming and going.

[Holding Frames (51) and (52)] The holding frames (51) and (52), which are carton holders provided above and below the carton take-out arm (33) at the carton forming position, are used in this embodiment. In this embodiment, the holding frame (51) has a semicircular holding arm (511) (51
One end of 2) is rotatably supported by a support shaft (513).

When the holding frame (51) including the holding arms (511) and (512) is closed from the open state shown in FIG. 1, the holding frame (51) is closed.
The inner peripheral shape of (51) becomes a circle as the final outer peripheral shape of the carton (11). Further, similarly to the holding frame (51), the lower holding frame (52) is a semicircular holding arm (521) (522) rotatably supported by a support shaft (523). The holding frames (51) and (52) are opened and closed by a driving source (not shown).

[Actual Operation] Next, the actual operation of the cylindrical container forming apparatus will be described. First, when the carton take-out arm (33) is rotated along a circular locus from the carton molding position shown by the solid line in FIG. 1 to the carton suction position shown by the imaginary line, as shown by the imaginary line in FIG. , A first suction cup (3) provided in the carton take-out arm (33).
4) (34) abuts the carton (11) located at the carton outlet (30) of the carton magazine (12).

When a vacuum device (not shown) is driven in this state, the Y constituting the carton take-out arm (33) is driven.
The inside of the V-shaped pipe (38) is in a negative pressure state, whereby the first suction cups (34) and (34) adsorb the carton (11). When the carton take-out arm (33) is returned to the carton take-out position (the position indicated by the solid line in FIG. 1) in the suction state, the flat carton (31) taken out of the carton magazine (31) as shown in FIG. 11) faces the other opening arm (35) in a state where it is sucked by the first suction cups (34) and (34) of the carton take-out arm (33).

Next, the opening arm (35) is advanced to bring the second suction cups (32) (32) at the ends thereof into contact with the back surface of the carton (11), and further, a vacuum device (not shown) is operated.
The inside of the Y-shaped pipe (39) becomes negative pressure and the carton (1
The back surface of 1) is adsorbed by the second suction cups (32) (32) (adsorption step). Next, the opening arm (35) is separated from the carton take-out arm (33). That is, the opening arm (35) is slightly moved toward the retracted position (the position indicated by the solid line in FIG. 1). Then, as shown in FIG. 2, the end of the carton (11) is opened in an elliptical shape to be in a semi-open state, whereby the above-described carton half-opening step is completed.

Next, the mandrel (41) is moved from the state shown in FIG.
(42) approaching and pushing them into the open end of the carton (11) while separating the carton take-out arm (33) and the opening arm (35) from the carton (11), the mandrel
The tapered end portions (43) and (44) of (41) and (42) penetrate into the end of the carton (11) in a wedge shape, whereby the open end of the carton (11) gradually deforms into a circular shape. . And mandrel
When the tip taper portions (43) and (44) of (41) and (42) enter the carton (11), the carton (11) is enlarged to a circular shape having a final cross-sectional shape, thereby forming the carton (11) into a cylindrical shape. The above-described preforming step for enlargement is completed.

Next, by closing the holding frames (51) and (52) in the open state, the outer periphery of the carton (11) is held by the holding frames (51) and (52). Then, the holding frame (51) (52) is in the carton (1
1), and the carton is formed into a final outer peripheral shape along the inner periphery of the holding frames (51), (52). This completes the carton holding process (FIG. 3).
reference). At this time, the carton (11) with the above holding frame (51) (52)
When holding the outer periphery of the carton (11), the mandrel (41) (42) is pushed into the open end of the carton (11). There is no inconvenience that a part of the peripheral wall of ()) is deformed inward or buckled.

A mandrel which is a mandrel from the state shown in FIG.
(41) Move (42) in the initial direction and put them in cartons (11)
When the mandrel drawing step of pulling out from the carton (11) is executed, the carton (11) is opened in a circular shape as the final sectional shape,
It is held by the holding frames (51) and (52). Next, a holding frame (51) (52) holding a carton (11) opened in a cylindrical shape.
Is moved from the position shown by the solid line in FIG. 3 to the lid closing position shown by the imaginary line.

Thereafter, in the lid closed position, the inner periphery of the open portion (10) of the carton (11) is glued by a gluing device (not shown), and the open portion (10) is made of a circular dish-shaped paper. A lid fitting step of pressing the lid (71) with a pusher (70) is performed, and then the holding frames (51) and (52) are opened.
The cylindrical container covered with (71) is completed.

[Others] In the above embodiment, the case where a cylindrical packaging container is formed has been described by way of example. As shown in FIG.
The mandrel (41) pushed into one end of (11) is formed in a quadrangular prism shape having a quadrangular pyramid-shaped tapered portion (43), and is a carton holder that is externally fitted to one end of the carton (11). The holding frame (51) may be constituted by U-shaped holding arms (511) and (512) that move toward and away from each other. In this case, it is possible to form a quadrangular cylindrical container that matches the inner peripheral shape of the holding frame (51) with which the holding arms (511) and (512) abut.

In the above embodiment, the holding frames (51) and (52) having the inner peripheral shape corresponding to the final outer peripheral shape of the carton (11).
To hold the carton (11), but the mandrel (4
1) 1 on the outer surface of the carton (11) into which (42) is pushed
The carton may be held by pinching the positions separated by 80 degrees with a pair of holding claws.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a cylindrical container forming apparatus for explaining an embodiment of the present invention, showing a state in which a flat carton (11) is suction-held by a carton take-out arm (33).

FIG. 2 is a view showing a state in which the carton (11) is slightly opened from the state of FIG. 1;

FIG. 3 is a view showing a state in which the carton (11) is opened in a cylindrical shape.

FIG. 4 is a perspective view of an essential part for explaining another embodiment.

FIG. 5 is an explanatory view of a conventional example.

[Explanation of symbols]

 (11) ・ ・ ・ Carton (32) ・ ・ ・ Second suction cup (34) ・ ・ ・ First suction cup (41) (42) ・ ・ ・ Mandrel (71) ・ ・ ・ Cover

Continued on front page F term (reference) 3E030 AA02 BA04 BA07 BB02 BC01 CA02 CA05 CA10 CB01 DA01 DA08 GA01 GA04 3E075 AA05 AA15 AA23 BA18 CA07 DA03 DA05 DA23 DA32 DC53 DC70 DC74 DE03 FA32 GA03 GA05

Claims (4)

[Claims] The flattened carton is formed into a cylindrical shape with both ends open, and the flattened carton is formed into a cylindrical shape, and the lid is inserted into an open end portion of the formed carton. A first suction head and a second suction head for separately sucking the front and rear surfaces of the carton, and the first suction head and the second suction head are relatively separated from each other in the suction state. A carton half-opening step of bringing the carton into a half-open state, and a preforming step of pushing a mandrel having an outer peripheral shape that matches or approximates the final inner peripheral shape of the carton into an end opening portion of the carton that has become half-opened, A carton holding step of holding the outer periphery of the carton with a carton holding tool so that the shape of the carton into which the mandrel is pushed is maintained; and And the mandrel drawing process of withdrawing the mandrel from the carton, the mandrel and a drawing process after the lid fitting the lid to the end opening of the carton the fitting process, the molding process of the cylindrical vessel. 2. The method for forming a cylindrical container according to claim 1, wherein the carton retainer holds an outer peripheral portion of the carton with an inner peripheral surface corresponding to a final outer peripheral shape of the carton. Molding method. 3. The method for forming a cylindrical container according to claim 1, wherein the tip of the mandrel on the insertion side with respect to the carton is formed in a tapered shape. 4. The method for forming a cylindrical container according to claim 1, wherein the carton holder is formed of a pair of halves that are fitted to the carton from the outside in the radial direction of the carton. Method of forming a cylindrical container.