JPH0986510A - Carton forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform ear attaching which is necessary for forming a carton within a small space in a short time by performing folding of ears and pressing of them to the carton which is being held in the same position by an ear folding means and an ear pressing means. SOLUTION: A movable stage 60 is driven downward by an air cylinder 61, a folding tool 62 engages with an ear section CT5, and an ear section CT is folded toward a barrel section CT6. When a bent angle of the ear section CT5 reaches a fixed quantity and the bending tool 62 descends, a pusher 65 faces the ear section CT5. Here, a piston rod 640 of an air cylinder 64 is made to advance toward a carton CT. The ear section CT5 is pressed to the barrel section CT6 by the pusher 65. As the folding of the ear section CT5 and connection to the barrel section CT6 are performed at the same position, a conveying route of a conveying mechanism is short, so that a device can be compact in size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carton molding apparatus using paper, plastic or the like as a base material.

[0002]

2. Description of the Related Art When sealing the upper end surface of a carton to form a so-called flat top having a flat surface, it is necessary to bend the ears protruding to the side of the carton and to join them to the carton body (for example (See JP-A-56-48901). Conventionally, the ears are bent and pressed against the body by separate devices, or the ears are gradually bent and joined to the body by a rail-shaped member provided along the transport path.

[0003]

In the above-mentioned conventional apparatus, the amount of transportation of the carton required for joining the ears is large, which causes an increase in the size of the carton molding line. In addition, in order to join the ears, it is necessary to heat and melt the heat-welding resin that covers the ears and the torso, but with conventional devices, it is necessary to press the ears to the torso after heating. Since it takes a long time, there is a possibility that the resin may cool in the middle of the process to cause a defective earing. In particular, when molding a flat top, the resin on the body side tends to cool, and it is necessary to press the ears immediately after heating. This is because at the stage of joining the ears, the heat of the resin is easily absorbed by the filling material because the liquid or the like is already filled.

An object of the present invention is to provide a molding apparatus capable of performing earing required for carton molding in a short time and in a small space.

[0005]

According to a first aspect of the present invention, there is provided a carton forming apparatus for bending an ear portion projecting laterally from one end surface of a carton to a body portion side of the carton and joining the body portion to the body portion. The ear-folding means for bending the ear portion toward the body portion side, and the ear-pushing means for pressing the ear portion against the body portion, the ear-folding means and the ear-pushing means,
The ears are bent and the ears are pressed against the carton held at the same location.

According to a second aspect of the present invention, there is provided a carton forming apparatus in which an ear portion projecting laterally from one end surface of the carton is bent toward a body portion side of the carton and joined to the body portion. An ear folding member capable of being bent from the one end face side to bend the ear portion toward the body portion side, and an amount of bending of the ear portion by the ear folding member and the ear folding member integrally movable in the moving direction thereof. An ear pushing member provided so as to face the ear portion when a predetermined amount is reached,
Ear pushing drive means for driving the ear pushing member toward the body portion.

According to a third aspect of the present invention, in the carton molding apparatus according to the second aspect, a notch is provided in the ear folding member, and the ear pushing member passes through the notch and comes into contact with the ear portion. It is a thing.

According to a fourth aspect of the present invention, in the carton molding apparatus according to the first or second aspect, at least one of the one end surface of the carton and the body portion is restrained when the ears are pressed against the body portion. The carton restraint means is provided.

According to a fifth aspect of the present invention, there is provided a rib folding device that bends a rib portion rising from one end face of the carton toward the one end face, the rib folding device being provided so as to be able to approach and separate from the one end face of the carton. A rib folding member rotatably supported around an axis parallel to the longitudinal direction of the rib portion, and a surface facing the one end surface of the rib folding member,
And an inclination imparting means for imparting a moment to the rib folding member such that the rib folding member is inclined to a specific side around the axis from a state parallel to the one end face.

According to a sixth aspect of the present invention, in the carton molding apparatus according to the fifth aspect, the inclination imparting means contacts the rib portion of the carton carried in a position facing the rib folding member and causes the inclination imparting means. Preliminary bending means for providing the rib portion with a bending tendency in the same direction as the inclination direction of the facing surface is provided.

[0011]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIGS. First, the carton will be described prior to the molding device. FIG. 8 (a) shows the carton before the curl folding, and FIG. 8 (b) shows the carton with the flat top molded. A ruled line (folding line, shown by a dashed line in the figure) K necessary for forming the flat top is pre-marked on the carton CT before the habit folding. The carton CT is formed by three-dimensionally bending a sheet material made of paper whose front and back surfaces are coated with a heat-welding resin. Therefore, the sheet material bonding portion CT1 exists at one location around the carton CT.

Fold the carton CT along the ruled line K,
The state in which the opening is sealed is shown in FIG. In this state, a rib portion CT3 in which the upper edge of the carton CT is abutted and sealed in a horizontal line with a predetermined width, and a substantially flat upper surface CT4 is provided.
A pair of ears CT5 protruding on both sides of the upper surface CT4 are formed. From this state, as shown in FIG. 9B, the rib portion C
If T3 is folded so as to be in contact with the upper surface CT4, then the ear CT5 is bent downward and joined to the body CT6, as shown in FIG.
A flat top is molded as shown in (b).

FIG. 3 shows the molding apparatus 1 viewed from the side thereof. This molding apparatus 1 has a loading mechanism 2
A transport mechanism 3, a rib folding mechanism 4, a heating mechanism 5,
It has the earing mechanism 6. FIG. 4 shows details of a portion where the carton CT is transferred from the carry-in mechanism 2 to the transport mechanism 3. The carry-in mechanism 2 pushes the carton CT held in the basket 7 onto the transport surface 30 of the transport mechanism 3 by the push-out tool 21 driven by the air cylinder 20. A state in which the push-out tool 21 is maximally protruded toward the transport surface 30 is shown in phantom in FIG. In addition, the basket 7 is a carton CT from the curling process of the carton CT to the sealing process.
It moves while holding the carton C at the top.
An ear receiver 70 for receiving the T ear CT5 is provided. As shown in FIG. 9A, the carton CT in which the rib portion CT3 is sealed and which is erected from the upper surface CT4 is inserted into the basket 7 that has been fed to the position of the carry-in mechanism 2.

A pre-bending mechanism 8 for the rib portion CT3 is provided above the transfer path of the carton CT from the carry-in mechanism 2 to the transport mechanism 3. The mechanism 8 pushes down the rib portion CT3 of the carton CT transferred to the transport surface 30 in the direction opposite to the transport direction (the loading mechanism 2 side) by an appropriate number of rollers 81 rotatable about the shaft 80. This is done prior to bending the rib portion CT3 as shown in FIG. 9 (b).
This is a measure for giving the rib portion CT3 a bend in a certain direction. In order to enhance the bending effect of the rib portion CT3, the roller 81 is provided at both end portions in the longitudinal direction of the rib portion CT3, particularly the ear portion CT5.
It is desirable to arrange so as to contact with the vicinity of the apex of.
More preferably, the rib portion CT3 is sandwiched between the roller 81 and the ear receiver 70 of the basket 7. The rib portion CT3 is not limited to the roller 81 and may be a plate material or the like.
The roller contacting means such as the roller 81 is most suitable for strongly bending the rib portion CT3 while suppressing the conveyance resistance of the carton CT.

FIG. 5 shows the transport mechanism 3 as seen from the direction of arrow V in FIG. The transport mechanism 3 has a transport surface 3
The carton CT loaded in 0 is conveyed in a predetermined conveyance direction (arrow M in FIG. 5) by a conveyance frame 31 provided on the conveyance surface 30.
It is conveyed linearly in 3 directions). The transport frame 31 has five arms 310 that are parallel to each other. The alternate movement of the air cylinder 32 that expands / contracts in the transport direction of the carton CT and the air cylinder 33 that expands / contracts in the direction that traverses the transport surface 30 cause the transport frame 31 to have arrows M1, M2 with reference to the solid line position in FIG. It is repeatedly driven in the order of M3 and M4. By the operation of the carrying frame 31, the cartons CT carried into the carrying-in position P1 of the carrying surface 30 are sequentially taken in between the arms 310 and carried to the carrying-out position P2 side by a predetermined amount. The amount of movement of the conveyance frame 31 in the conveyance direction is equal to that of the arm 3
It is equal to 10 arrangement pitches. Therefore, there are three carton stop positions S1 to S3 between the carry-in position P1 and the carry-out position P2 of the transport surface 30. As shown in FIG. 3, the rib folding mechanism 4 is provided at the stop position S1.
A heating mechanism 5 is provided at 2, and an earing mechanism 6 is provided at the stop position S3. A guide rail 34 is provided at a position on the opposite side to the transport frame 31 with respect to the transport surface 30 (see FIG. 5). The guide rail 34 is biased toward the conveyance frame 31 side by the coil spring 35.

As shown in FIG. 4, the rib folding mechanism 4 is
A plate-shaped rib folding tool 4 arranged above the stop position S1
0 is pressed against the rib portion CT3 by the air cylinder 41 to bend the rib portion CT3 as shown in FIG. 9 (a).
The rib folding tool 4 is the piston rod 4 of the air cylinder 41.
10 and a shaft 42 are rotatably connected. Axis 42
Extend in a direction parallel to the transport surface 30 and orthogonal to the transport direction of the carton CT. The rib-folding tool 40 is illustrated with the tension spring 43 attached to the end portion on the loading mechanism 2 side, with the lower surface 400 being parallel to the transport surface 30 (shown in phantom in FIG. 4) with the shaft 42 as the center. It is held in a state of being slightly tilted in the counterclockwise direction of 4. Due to the inclination of the lower surface 400, the rib portion CT3 is always bent in a fixed direction.
Since the rib portion CT3 is previously tilted in the direction opposite to the transport direction of the carton CT by the preliminary bending mechanism 8 described above, the lower surface 400 is inclined in the same direction as the bending direction. In addition, without using the tension spring 43, the mass of the rib folding tool 40 with respect to the shaft 42 is unbalanced, and the rib folding tool 4 is
You may make it incline 0.

The reason why the bending directions of the rib portions CT3 are aligned as described above is that the bonding portion CT1 exists in a part of the rib portion CT3 of the carton CT. That is, since the bonded part CT1 is more difficult to bend than the other parts of the carton CT, when the rib part CT is bent, the bonded part CT1 is bent so as to be on the upper side as shown in FIG. 9B. This is because it is desirable to align the directions. In addition, in order to bend the rib part CT3 so that the bonding part CT1 is always on the upper side, the carton CT is aligned in the unloading mechanism 3 so that the bonding part CT1 is located in the front in the transport direction (on the unloading position P2 side). It is necessary to bring in. In FIG. 4, reference numeral 44 is an ear holder that receives the ear portion CT5 of the carton CT when the rib portion CT3 is folded by the rib folding tool 4.

As shown in FIG. 6, the heating mechanism 5 includes a pair of chambers 50 opposed to the lower surface of the ear CT5 and the ear joint region of the body CT6, and a heater 51 for supplying hot air into the chamber 50. Have. An appropriate number of through holes (not shown) are provided in the facing surfaces of the chamber 50 and the ears CT5 and the body CT6. By the hot air blown from the chamber 50,
The lower surface of the ear part CT5 and the ear part joining region of the body part CT6 are heated, and the resin in the heated part is melted.

As shown in FIG. 1, the earing mechanism 6 has a movable base 60 supported by a fixed portion 10 (see FIG. 3) of the apparatus 1 so as to be vertically movable, and the movable base 60 is vertically driven. Air cylinder 61, a pair of flat plate-shaped bending tools 62 suspended from the movable table 60, and the bending tools 62
From the air cylinder 64, which is suspended via the bracket 63 and expands and contracts in the horizontal direction, and the pusher 65 attached to the piston rod 640 of the air cylinder 64. When the movable table 60 is driven downward by the air cylinder 61, the bending tool 62 engages with the ear CT5, and the ear CT5 is bent toward the body CT6. Ear CT5
The bending angle of the
The pusher 65 opposes the ear CT5 when the bending tool 62 is lowered until the temperature reaches (°). When the piston rod 640 of the air cylinder 64 is advanced toward the carton CT in this state, the ear CT5 is pressed against the body CT6 by the pusher 65. The state in which the bending tool 62 is lowered and the pusher 65 is moved forward is shown by an imaginary line in FIG.

As is clear from the above, in the molding apparatus 1 according to this embodiment, the ears CT5 are bent and pressed against the body CT6 while the carton CT is held at the stop position S3. be able to. Therefore, the ear C
After heating the joining region between T5 and the body CT6, the ear CT5 can be joined to the body CT6 in a short time, and the occurrence of the earing defect due to the cooling of the resin can be suppressed. Also, the ear CT5
Since the bending and the joining to the body CT6 are performed at the same location, the transport path of the transport mechanism 3 is short, and the device 1 can be configured compactly. Since the bending tool 62 and the pusher 65 are held in a fixed positional relationship in the vertical direction,
There is no possibility that the bending tool 62 and the pusher 65 interfere with each other.

By the way, if the pusher 65 is arranged below the lower end of the bending tool 62, the pusher 65 can hold only the apex of the ear CT5, and the joint strength may be weakened. Further, if the pusher 65 tries to hold the ear CT5 at a stage where the bending angle of the ear CT5 is shallow (for example, about 15 °), the ear CT5 may be crushed by the pusher 65. Therefore, as shown in FIG. 2, the bending tool 62 is provided with a notch 620 that opens to the lower end side thereof, and the pusher 65 has the notch 62.
It is desirable to press the ear CT5 through 0. With this configuration, as shown in FIG. 2B, the ear CT5 is deeply bent by the bending tool 62,
The pusher 65 can hold the central portion of the ear CT5 in a wide range. As a result, as shown in FIG. 2C, the area of the actual joint portion BD between the ear portion CT5 and the body portion CT6 is increased, and high joint strength is obtained.

When the ear portion CT5 is pushed in by the pusher 65, the pushing force may swell the upper surface CT4 of the carton CT as shown by an imaginary line in FIG. In order to prevent this bulge, a restraint tool 66 is attached to the lower surface side of the movable table 60 as shown in FIG. 1, and the restraint tool 66 is pressed when the ear CT5 is pressed by the pusher 65 as shown in FIG.
It is recommended to prevent the swelling of the carton upper surface CT4. It is desirable that the restraint tool 66 be attached to the movable table 60 so that the position thereof can be adjusted in the vertical direction. Further, when the body CT6 swells when the ear CT5 is pressed, the body CT6 also needs to be restrained. In the above-described device 1, the body CT6 is formed by the guide rail 34 and the coil spring 35 of the transport mechanism 3.
Since the sheet is pressed toward the transport frame 31 side, the receiving member 36 can be attached to the transport frame 31 as shown in FIGS. 5 and 7, and the body CT6 can be sandwiched by the guide rail 34 and the member 36.

In the correspondence between the above embodiment and the claims, the folding tool 62 and the driving portion for moving the folding tool 62 up and down are the ear folding means, the pusher 65 and the air cylinder 64 are the ear pushing means, and the folding tool 62 is the ear folding. As members, the pusher 65 is an ear pushing member, the air cylinder 64 is an ear pushing driving means, a restraint tool 66, a guide rail 34, and a coil spring 3.
5 and the receiving member 36 correspond to the carton restraining means, the rib folding tool 40 corresponds to the rib folding member, the tension spring 43 corresponds to the inclination imparting means, and the preliminary bending mechanism 8 corresponds to the preliminary bending means.

[0024]

As described above, according to the inventions of claims 1 to 4, since the ears of the carton can be bent and joined to the body at the same location, the ears and the body are heated. It is possible to reduce the time from when the ears are pressed against the torso to suppress the occurrence of ear wearing defects. Further, the forming apparatus can be made compact by shortening the transportation distance of the carton necessary for the earing process. In addition, according to the second aspect of the present invention, since there is no risk of the ear folding member and the ear pressing member interfering with each other, it is possible to reduce the labor required for adjusting the positional relationship between both members and the drive timing. According to the invention of claim 3, it is possible to press the ear portion in a wide range by the ear pressing member while deeply bending the ear portion by the ear folding member. According to the invention of claim 4, bulging of the carton at the time of joining the ears can be suppressed.

According to the fifth and sixth aspects of the invention, when the ribs are bent prior to joining the ears, the bending directions can be made uniform. In the invention of claim 6, the rib portion is bent before the rib folding member, so that the rib portion can be more surely bent in a fixed direction.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which an earing mechanism provided in a molding apparatus according to an embodiment of the present invention is viewed from a carton transport direction.

2A and 2B are views showing one mode of the bending tool and the pusher shown in FIG. 1, FIG. 2A being a view showing the bending tool as seen from the moving direction of the pusher, and FIG. FIG. 6C is a diagram showing a state where the ears are joined, and FIG.

FIG. 3 is a side view of the molding apparatus according to the embodiment of the present invention.

FIG. 4 is a view showing a carton loading mechanism for the apparatus shown in FIG.

5 is a diagram showing a state in which a transport mechanism attached to the apparatus of FIG. 3 is viewed in the direction of arrow V in FIG.

FIG. 6 is a diagram showing a state where a heating device attached to the device of FIG. 3 is viewed from the carton transport direction.

FIG. 7 is a diagram showing an example of preventing the bulging of the carton when pressing the ears against the body.

8A and 8B are diagrams showing a carton, in which FIG. 8A shows a state before foldable folding, and FIG. 8B shows a state in which a flat top is molded.

9A and 9B are diagrams showing a carton in the middle of molding, wherein FIG. 9A shows a carton immediately after its upper end is sealed, and FIG. 9B shows a carton whose upper rib portion is bent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Molding apparatus 2 ... Carrying-in mechanism 3 ... Conveying mechanism 4 ... Rib folding mechanism 5 ... Heating mechanism 6 ... Earing mechanism 7 ... Basket 8 ... Pre-bending mechanism 20 ... Air cylinder 31 ... Conveying frame 36 ... Receiving member 40 ... Rib folding Tools 41, 61, 64 ... Air cylinder 43 ... Tensile spring 62 ... Bending tool 65 ... Pusher 66 ... Restraint tool CT ... Carton CT3 ... Rib part CT4 ... Top surface CT5 ... Ear part CT6 ... Body part

Claims (6)

[Claims] 1. A carton molding apparatus for bending an ear portion laterally protruding from one end surface of a carton to the body portion side of the carton and joining the body portion to the body portion, wherein the ear portion is bent to the body portion side. Folding means, and ear pushing means for pressing the ear portion to the body portion, the ear folding means and the ear pushing means, the folding of the ear portion with respect to the carton held in the same place and the A carton forming apparatus, which is configured to press the ears, respectively. 2. A carton molding apparatus for bending an ear portion laterally protruding from one end surface of a carton to a body portion side of the carton and joining the carton portion to the ear portion from one end surface side of the carton. An ear folding member that abuts and bends the ear portion toward the trunk portion, and a movable amount of the ear folding member and the ear folding member that can move integrally with the ear folding member reach a predetermined amount. A carton molding apparatus comprising: an ear pushing member provided so as to face the ear portion at a point of time, and ear pushing driving means for driving the ear pushing member toward the body portion. . 3. The carton molding apparatus according to claim 2, wherein the ear folding member is provided with a notch, and the ear pushing member passes through the notch and comes into contact with the ear portion. 4. The carton restraining means for restraining at least one of the one end surface of the carton and the body portion when the ear portion is pressed against the body portion is provided. Carton forming device described. 5. A rib folding device that bends a rib portion rising from one end face of a carton toward the one end face, the rib folding device being provided so as to be able to approach and separate from the one end face of the carton, and the longitudinal direction of the rib portion. A rib folding member rotatably supported about an axis parallel to the direction, and a surface of the rib folding member facing the one end face is inclined from the state parallel to the one end face to a specific side around the axis. An inclination imparting means for imparting such a moment to the rib folding member, and a rib folding device. 6. The rib portion is brought into contact with the rib portion of the carton carried in a position facing the rib folding member so that the rib portion bends in the same direction as the tilt direction of the facing surface by the tilt imparting means. The rib folding device according to claim 5, further comprising: a pre-bending unit that is provided on the rib folding device.