JPH08217006A - Body-folding device for packaging machine - Google Patents

Abstract

PURPOSE: To prevent securely an inner body flap from returning in the opposite direction to its fold due to the return movement of the folding piece of the inner body flap. CONSTITUTION: The front ends 6a, etc., of folding pieces 6 and 7 strike against body flaps B2 and B1 at corners A6 and A7 to bend the bases of the body flaps B2 and B1 along the corners A6 and A7, and then, while elastic bodies 6c and 7c are deformed in the opposite direction to pressure by means of a counterforce from a folding face A5, the folding pieces 6 and 7 stroke the body flap B2 and B1 along the folding face A5 and, at the same time, fold them. The inner body flap B2 folded once strikes against the comb-teeth-like front end 2a of a second clamping face 2 and is therefore prevented from returning in the opposite direction to its fold due to friction caused by the return movement of the folding piece 6 of the inner body flap B2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-bondable wrapping material such as cellophane film or polypropylene film around a box-shaped content in which packages such as cigarettes are collected and packed in a carton. The body of a packaging machine that overwraps or encloses a heat-bondable material such as hot-melt sand paper or kraft paper around a box-shaped content that is just a collection of cigarettes packed in small boxes. The folding device, more specifically, the box-shaped contents are abutted against the encapsulation material, and the encapsulation material is wound in a U shape around the box-shaped contents, and then radially provided on the outer periphery of the turret in this state. The present invention relates to a device which is carried into a pocket, and while the box-shaped contents and the packaging material are conveyed as the turret is rotated, the body flaps of the packaging material are sequentially folded and heat-bonded.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, U.S. Pat. No. 3,810,314 as a body folding device for a packaging machine of this type, a box-shaped content in which an encapsulating material is wound in a U shape is waited in a stopped state. After being carried into the turret pocket, the pocket is moved upward by a predetermined angle due to intermittent rotation of the turret and stopped, and then the folding piece of the inner case flap starts to swing and reverses the turret rotation direction. By colliding with the inner body flap of the encapsulating material located on the lower side, the inner body flap is folded along the folding surface of the box-shaped contents, and substantially at the same time when the folding piece of the inner body flap returns and moves. , The folding piece of the outer body flap starts swinging and hits the outer body flap of the packaging material located above in the turret rotation direction side, thereby By folding the wrap along the folding surface of the box-shaped contents and overlapping it with the already folded inner body flap, and by pressing the heater against the overlapping portion of the body flap while the next turret is rotating or after the rotation is stopped. Some of them are heat-bonded to complete the body folding.

For the purpose of reducing the number of parts,
By providing a heater on the folding piece of the outer body flap, the outer body flap is folded along the folding surface of the box-shaped contents, and is superposed on the already folded inner body flap, and at the same time, this overlapping portion is heated. Some of them are glued to complete the body folding.

[0004]

SUMMARY OF THE INVENTION However, in such a conventional body folding device for a packaging machine, the rocking orbits of the folding piece of the inner body flap and the folding piece of the outer body flap are such that the box-shaped contents of An outer side with a wide length in the folding direction because it draws an arc that hits the body flap through a position away from the corner of the folding surface and comes into pressure contact with the folding surface of the box-shaped contents near the end of the swing. The body flap and the inner body flap cannot be tightly folded along the folding surface of the box-shaped contents, which causes the body flap to be heat-bonded in a loose state, resulting in a poor finished product appearance. Therefore, there is a problem that the product value is lowered.

Furthermore, when the folding piece of the inner case flap moves back after folding the inner case flap, the inner case flap once folded is returned in the anti-folding direction by the friction with the inner case flap. There is a problem in that the inner body flap is heat-bonded in a loose state, and as a result, the appearance of the finished product is deteriorated and the commercial value is significantly reduced.

When a heater is provided on the folded piece of the outer body flap, when the folding operation of the outer body flap is stopped midway due to inching or the like, the heater also overlaps the inner body flap and the outer body flap. Since they are in contact with each other, there is a problem in that the overlapped portion is scorched or thermally deformed, and the appearance of the finished product is deteriorated and the commercial value is remarkably reduced.

In view of such conventional circumstances, the present invention folds the outer body flap and the inner body flap, which have a large length in the folding direction, from the corners of the folding surface of the box-shaped contents in a squeezing manner, while folding the inner body flap. The purpose is to completely prevent the inner body flap from returning in the anti-folding direction due to the return movement of the outer body flap, and to prevent the heater from directly contacting the body flap even if the outer body flap is stopped during the folding operation. That is another purpose.

[0008]

The technical means taken by the present invention to solve the above-mentioned problems are as follows: The tip of the first holding surface facing the outer body flap of the covering material protruding from the box-shaped contents of the pocket. Part and the tip of the second sandwiching surface that faces the inner body flap of the encapsulating material protruding from the box-shaped contents, and the convex portion and the concave portion are alternately continuous in the left-right direction orthogonal to the protruding direction of these body flaps. Comb teeth are formed in a comb shape, and the folding pieces of the outer body flap and the folding pieces of the inner body flap are combed so that the tips of the folding pieces engage with the comb-teeth-shaped tip portions of the first holding surface and the second holding surface. It is formed in a tooth shape and is swingably supported in a direction in which it fits with the comb-teeth-shaped tip portions of the first holding surface and the second holding surface, and the tip end is folded into this swing arm. It is reciprocally mounted in the direction of approaching or separating from the surface and The elastic movement of the tip is regulated while interposing an elastic body so that the tip is constantly pressed toward the folding surface of the box-shaped contents between the swing arm and the swing arm. It is characterized in that the box-shaped contents are moved in an arcuate path that gradually enters the box-shaped contents from the corners located on the side of the folding flap of the box-shaped contents to the inside of the box-shaped contents.

[0009] It is preferable that a temporary heater is continuously provided behind the folding piece of the outer case flap in the swinging direction.

[0010]

According to the above technical means of the present invention, the folding piece of the inner body flap formed in the shape of a comb is formed from the corner located on the inner body flap side of the folding surface of the box-shaped contents from the folding surface. By swinging in an arcuate orbit that gradually enters the inside of the box-shaped contents, the tip of the folding piece hits the inner body flap at the corner, bends the base of the inner body flap along the corner, and then folds it. While folding the inner body flap along the folding surface while folding the inner body flap while deforming the elastic body in the anti-elasticity direction by the reaction force from the surface, the inner body that was once folded by friction due to the return movement of the folding piece of the inner body flap Even if the flap tries to return in the anti-folding direction, it hits against the comb-teeth-shaped tip of the second holding surface and is prevented from returning in the anti-folding direction, and similarly, the flap is shaped like a comb-teeth. By swinging the folded piece of the outer body flap, which has been folded, in an arcuate orbit that gradually enters from the corner located on the outer body flap side of the folding surface of the box-shaped contents to the inside of the box-shaped contents from the folding surface. , The tip of the folding piece hits the outer body flap at the corner and bends the base of the outer body flap along the corner, and then the folding piece is deformed by the reaction force from the folding surface while deforming the elastic body in the anti-elasticity direction. The outer body flap is squeezed along the folding surface while being folded, and is superposed on the inner body flap.

Further, a temporary heater is continuously provided behind the folding piece of the outer case flap so that the inner case flap and the outer case flap are temporarily attached after the folding of the outer case flap is completed. The heater is in contact with and temporarily attached.

[0012]

An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, as shown in FIG. 4, the box-shaped contents A in the boxed state supplied from the cartoning apparatus in the previous process are reversed by a reversing mechanism so that the carton's body-to-be-joined portion is a feeding mechanism B such as a suction belt. After reversing and raising so as to face the encapsulating material B such as cellophane film or polypropylene film supplied by the operation of ', the reversing and raising box-shaped contents B are intermittently reciprocated in the horizontal direction by, for example, a cam. Then, the carton B is shaped like a U along the upper and lower surfaces A1 and A2 and the front end surface A3 of the box-shaped contents A by being pushed by the pusher A'and pushed against the encapsulating material B held substantially vertically. The turret C is carried into the pocket C1 which is stopped at the carry-in position P1 while being rolled up.

A plurality of turrets C are provided on the outer periphery of the tip of the rotary shaft C2, and in the present embodiment, six pockets C1 ...
2 are connected in a radial manner, the rotation shaft C2 is axially supported by a non-rotatable support holder C3 as shown in FIG. 2, and the drive source is the same as that of the pusher A'or a drive which operates intermittently in synchronization therewith. By linking with the power source, the pockets C1 ... Are intermittently rotated by 60 degrees at substantially the same time as the folding piece 7 of the outer case flap B1 described later returns and moves.
As shown in FIG. 4, the inner trunk flap B2 is provided with the pocket C1 located at the carry-in position P1 60 degrees downstream from the pocket C1.
While moving to the folding position P2 of the outer trunk flap B1, the pocket C1 located at the folding position P2 is moved to the trunk mounting position P3 located 60 degrees downstream thereof, and the pocket C1 located at the trunk mounting position P3. From that 60
By the pusher A ′, the rotation of the pockets C1 ... Is completed by the time the box-shaped contents A are hit by the pusher A ′.

The pockets C1 have a first holding surface 1 and a second holding surface 2 facing the upper and lower surfaces A1 and A2 of the box-shaped contents A loaded at the loading position P1 as shown in FIGS.
And the abutting surface 3 facing the tip surface A3, and the third holding surfaces 4 and 4 facing the left and right side surfaces A4 and A4. The first holding surface 1 is located on the rotation direction side of the turret C and is a box. Outer body flap B of the encapsulating material B protruding from the contents A
1 and a tip portion 2a opposite to the rotation direction of the turret A and facing the inner body flap B2 of the encapsulating material B protruding from the box-shaped contents A, these outer body flaps B1 and The convex portions and the concave portions are alternately formed in a comb tooth shape in the left-right direction orthogonal to the protruding direction of the inner body flap B2. In the case of the present embodiment, the positions of the first clamping surface 1, the second clamping surface 2, the third clamping surfaces 4 and 4 and the tip surface A3 can be adjusted and moved correspondingly to the size change of the box-shaped contents A. By mounting, the distance between the first holding surface 1 and the second holding surface 2, the distance between the third holding surfaces 4 and 4, and the dimensions from the tip portions 1a and 2a to the tip surface A3 can be adjusted.

Further, the comb-teeth-shaped tip portion 1 of the first holding surface 1
In a, suction holding means 5 for sucking and holding the outer body flap B1 over a section from the carry-in position P1 of the box-shaped contents A and the encapsulating material B to the folding position P2 of the outer body flap B1.
To provide.

The suction holding means 5 has a plurality of suction holes 5a ... Opened in the comb-teeth-shaped tip 1a of the first holding surface 1 so as to face the outer body flap B1, and the suction holes 5a ... A pocket C1 stopped at the carry-in position P1 to a pocket stopped at the folding position P2 is connected to a suction source (not shown) such as a vacuum pump, and in the middle of a passage 5b ... Connecting the suction holes 5a ... And the suction source. A suction control section 5c is provided to communicate the passages 5b ... Only in the section up to C1. In the case of the embodiment, as shown by the broken line in FIG. 1 and FIG. 2, the passages 5b are directed to the rotation shaft C2 of the turret C so that the ends thereof are directed to the support holder C3 and are circumferentially arranged along the outer peripheral surface of the rotation shaft C2. A suction control section 5c, which is continuously connected to the suction source, is provided on the inner peripheral surface of the support holder C3 that is continuously provided so as to be arranged at equal intervals and faces the ends of the passages 5b ... It is partially recessed so as to match only the end of the passage 5b of the pocket C1 located in the section leading to P2.

Further, a folding piece 6 of the inner body flap B2 and a folding piece 7 of the outer body flap B1 are arranged around the pocket C1 which stops at the folding position P2.

Folding piece 6 of this inner body flap B2
Is formed in a comb-teeth shape so that its tip 6a fits with the comb-teeth tip 2a of the second holding surface 2 as shown in FIG.
The comb-shaped tip 2a is swingably supported in a direction in which the tip 6a is fitted, and the tip 6a is reciprocally movable with respect to the swing arm 6b in a direction of approaching or separating from the folding surface A5 of the box-shaped contents A.
In the case of the present embodiment, the tip 6a is attached so as to be swingable, and the tip 6a is constantly pressed between the tip 6a and the swing arm 6b toward the folding surface A5 of the box-shaped contents A, such as a spring. An elastic body 6c is interposed and a stopper 6d, which is connected to the swing arm 6b, is abutted against the tip 6a to regulate the swing angle corresponding to the elastic movement amount of the tip 6a, and the swing angle is changed. The swing radius from the swing center 6e of the moving arm 6b is the distance between the swing center 6e and the corner portion A6 of the folding surface A5 corresponding to the end face of the box-shaped contents A and located on the inner trunk flap B2 side. Set to be equal to. Therefore, due to the swinging of the swinging arm 6b, the tip 6a moves from the corner portion A6 located on the inner body flap B2 side of the folding surface A5 of the box-shaped contents A to the inside of the box-shaped contents A from the folding surface A5. By swinging along an arcuate orbit T1 that gradually enters, the sliding contact along the folding surface A5 receives the reaction force from the folding surface A5, thereby resisting the elastic force of the elastic body 6c. 6c is swung while deforming in the anti-elasticity direction. Further, the folding piece 6 of the inner body flap B2 is linked to the same drive source as the pusher A'and the turret C and is intermittently controlled in operation by, for example, a cam or the like, and the turret C is rotated or immediately after the rotation is stopped. Swinging is started in the folding direction of the inner case flap B2 from the standby position where it does not interfere with the movement of the pockets C1 ..., and after the rotation of the turret C is stopped, the tip 6a is fitted to the comb tooth-shaped tip 2a of the second holding surface 2. Then
After the tip 6a reaches the substantially central position of the folding surface A5 of the box-shaped contents A, it is returned to the opposite direction and returned to the standby position.

Folding piece 7 of the outer body flap B1
Is formed in a comb-teeth shape so that its tip 7a is fitted with the comb-teeth-shaped tip portions 1a, 2a of the first nipping surface 1 and the second nipping surface 2 as shown in FIG. 1 and the second holding surface 2 is swingably supported in a direction of fitting with the comb-teeth-shaped tip portions 1a and 2a, and the tip end 7a approaches the folding surface A5 of the box-shaped contents A with respect to the swing arm 7b. Alternatively, it can be reciprocally moved in the separating direction, and in the case of the present embodiment, it is mounted so as to be swingable, and the tip 7a is attached to the folding surface A5 of the box-shaped contents A between the tip 7a and the swing arm 7b. An elastic body 7c such as a spring is interposed so as to be constantly pressed toward the swing arm 7b.
By abutting a stopper 7d continuous to the tip 7a, the swing angle corresponding to the elastic movement amount of the tip 7a is regulated, and the swing angle is the swing from the swing center 7e of the swing arm 7b. The radius is the swing center 7e and the folding surface A of the box-shaped contents A
It is set to be equal to the distance from the corner portion A7 located on the outer body flap B1 side. Therefore, due to the swinging of the swinging arm 7b, the tip 7a moves from the corner A7 located on the outer body flap B1 side of the folding surface A5 of the box-shaped contents A to the inside of the box-shaped contents A from the folding surface A5. Rocks along an arcuate trajectory T2 that gradually enters the folding surface A5
By sliding along the elastic body 7c, the elastic body 7c receives the reaction force from the folding surface A5 and resists the elastic force of the elastic body 7c.
It swings while deforming c in the anti-repression direction. Further, behind the folding piece 7 in the swinging direction, a comb-teeth-shaped temporary attachment heater is fitted to the comb-teeth-shaped tip portions 1a and 2a for pressing the overlapping portions B3 of the folded inner body flap B2 and the outer body flap B1. 7f are installed in a row. Furthermore, the outer body flap B
The folding piece 7 of No. 1 is linked to the same drive source as that of the folding piece 6 of the pusher A ′, the turret C, and the inner body flap B2, and is intermittently operated and controlled by, for example, a cam, and immediately after the rotation of the turret C is stopped. By starting to swing from the standby position that does not interfere with the movement of the pockets C1 ... To the folding piece 7 of the outer case flap B1 in conjunction with the return movement of the inner case flap B2, the tip 7a is comb-shaped on the first holding surface 1. The tip portion 1a and the comb-teeth-shaped tip portion 2a of the second holding surface 2 are sequentially fitted, and the temporary heater 7f is pressed against the overlapping portion of the inner body flap B2 and the outer body flap B1 for a predetermined time, and the turret C is attached. At the same time as the start of rotation, the return movement is made in the opposite direction to return to the standby position.

The pocket C which stops at the body mounting position P3
1, the overlap portion B3 of the inner body flap B2 and the outer body flap B1 temporarily attached as shown in FIG.
The secondary heater 8 for completely heat-adhering is disposed so as to be reciprocally movable in a direction of approaching or separating from the folding surface A5 of the box-shaped contents A in the pocket C1, and the pusher A ′, the turret C, and By interlocking with the same driving source as the folding pieces 6 and 7 and intermittently controlling the operation with, for example, a cam, the rotation of the turret C is stopped and the pocket C is almost simultaneously.
1 is moved closer to the standby position where it does not interfere with the movement of 1 and pressed against the overlapping portion B3 for a predetermined time, and is returned to the standby position by returning in the opposite direction before the turret C starts rotating.

Pocket C1 that stops at the carry-out position P4
As shown in FIG. 4, a carry-out pusher 9 for pulling out the box-shaped contents A from the inside of the pocket C1 toward the side flap folding process is provided around the circumference of the box-shaped contents A in the pusher A '.
Is arranged so as to be reciprocally movable in the same direction as the carrying-in direction, and is linked with the same drive source as the pusher A ′, the turret C, the folding pieces 6, 7 and the secondary heater 8 to intermittently control the operation by, for example, a cam. As a result, substantially simultaneously with the rotation stop of the turret C, the turret C is moved from the standby position that does not interfere with the movement of the pockets C1 ... In the same direction as the loading direction, and is pushed against the tip surface A3 of the box-shaped contents A in the pocket C1 and pushed. In the side flap folding step, the box-shaped contents A are unloaded, transferred to a conveyor belt (not shown), and then returned to the opposite direction to return to the standby position by the time the turret C starts to rotate. In the case of the embodiment, the first holding surface 1 ... and the second holding surface 2 of the pocket C1 ...
Of the interlocking rod 9 of the carry-out pusher 9 is divided into two parts in the left-right direction orthogonal to the carry-in direction of the carry-out pusher 9.
Power is transmitted from the drive source to the carry-out pusher 9 by inserting a and connecting its tip to a drive source (not shown).

Next, the operation of the body folding device of such a packaging machine will be described.

First, as the pusher A'actuates, the box-shaped contents A, which have been inverted and raised as shown in FIG. 4, abut the encapsulating material B and are wound in a U-shape, and are stopped at the carrying-in position P1 of the turret C as it is. It is brought in. Thereby, as shown in FIGS. 1, 2 and 3, the encapsulating material B is
The side flaps B4, B4 located on the front side in the carrying-in direction collide with the third holding surfaces 4, 4 and are folded along the left and right side surfaces A4, A4 of the box-shaped contents A.

In this state, since the end of the passage 5b of the pocket C1 which stops at the carry-in position P1 is located at the position matching the suction controller 5c as shown in FIG. 1, the suction holes 5a of the suction holding means 5 are sucked. The outer body flap B1 communicates with the source to suck and hold the outer body flap B1 on the comb-teeth-shaped tip end portion 1a of the first holding surface 1, whereby the outer body flap B1 is kept in an upright state.

As it is, the turret A is rotated and the pocket C1 into which the box-shaped contents A and the encapsulating material B are loaded is transported from the loading position P1 to the folding position P2. During this period, the ends of the passages 5b ... Of the pocket C1 continue to coincide with the suction control section 5c, so that the outer body flap B1 is attached to the comb-shaped tip 1a of the first holding surface 1 in the suction hole 5a of the suction holding means 5. The outer trunk flap B1 is kept in a standing state without falling down in the counter-rotational direction while continuing to be sucked and held.

After the end of this conveyance, the folding piece 6 of the inner body flap B2 which has begun to swing fits into the comb tooth-shaped tip portion 2a of the second holding surface 2, and the tip 6a is folded into the box-shaped contents A. The corner A6 of the surface A5 located on the inner body flap B2 side abuts the base end of the inner body flap B2. As a result, the base portion of the inner body flap B2 is bent along the corner portion A6, and then the tip end 6a receives a reaction force from the folding surface A5 of the box-shaped contents A, whereby the elastic body 6c is deformed in the anti-elasticity direction. On the other hand, it deviates from the arcuate trajectory T1, whereby the inner body flap B2 is folded along the folding surface A5 of the box-shaped contents A while being squeezed.

After the folding, the inner body flap B
The folding piece 6 of 2 starts the return movement. At this time, the folding piece 6 returning and moving and the folded inner body flap B2
Due to the friction between the inner body flap B2 and the inner surface of the second inner surface flap B2, the base end of the inner body flap B2 abuts the comb-teeth-shaped tip 2a of the second holding surface 2 to prevent the inner body flap B2 from loosening. It

Simultaneously with this return movement, the folding piece 7 of the outer body flap B1 which has begun to swing fits into the comb-teeth-shaped tip portion 1a of the first holding surface 1, and the tip end 7a of the box-shaped contents A. Corner A7 located on the outside body flap B1 side of the folding surface A5
At the end of the outer trunk flap B1. Thereby, the base end of the outer body flap B1 is bent along the corner portion A7, and at the same time, the suction hole 5a of the suction holding means 5 is formed.
Separate the outer torso flap B1 from. Then tip 7
When a receives a reaction force from the folding surface A5 of the box-shaped contents A, the elastic body 7c deviates from the circular arc track T2 while deforming in the anti-elasticity direction and deforming in the anti-elasticity direction. It is folded along the folding surface A5 of the box-shaped contents A while being squeezed, and is superposed on the already folded inner body flap B2.

Subsequently, the temporary heater 7f is temporarily attached to the overlapping portion B3 of the inner body flap B2 and the outer body flap B1 by pressing for a predetermined time. Thereafter, the turret A rotates to convey the box-shaped contents A temporarily attached from the folding position P2 and the pocket C1 of the encapsulating material B to the trunking position P3, and at the same time, the box-shaped contents A succeeding from the loading position P1. Also, the pocket C1 in which the packaging material B is loaded is transported to the folding position P2.

After the completion of this conveyance, the inner cylinder flap B in which the secondary heater 8 which has moved closer is temporarily attached as shown in FIG.
2 and the overlapped portion B3 of the outer body flap B1 are pressed against each other for a predetermined time to be completely heat-bonded, whereby the body winding process is completed. After that, the turret A rotates to convey the pocket C1 which has been wound from the body stacking position P3 to the carry-out position P4, and at the same time, the pocket C1 for the subsequent temporarily attached box-shaped contents A and the encapsulating material B from the folding position P2. Is conveyed to the body stacking position P3, and the pocket C1 in which the box-shaped contents A and the encapsulating material B are further conveyed from the carry-in position P1 is conveyed to the folding position P2.

After the completion of the conveyance, the carry-out pusher 9 that has moved closer to the front end surface A3 of the box-shaped contents A in the pocket C1.
Then, the box-shaped contents A are carried out and delivered in the side flap folding step, and the above-described operation is repeated thereafter.

In the embodiment shown above, the case where the encapsulating material B such as cellophane film or polypropylene film is overwrapped around the box-shaped contents A supplied from the cartoning device is shown. However, the same effect can be obtained by wrapping a heat-bondable hot melt sand paper or kraft paper around the box-shaped contents that are just a collection of cigarettes packed in small boxes. Needless to say, in the case of overwrapping with kraft paper, for example, when it is supplied to a predetermined position by the operation of the carton feeding mechanism B ′ such as a suction belt, an adhesive such as hot melt is applied to the sealing corresponding position. After being applied, the temporary heater 7f and the secondary heater 8 are used to surely bond them.

The turret C has six pockets C1.
... are arranged in series and intermittently rotated by 60 degrees, but the invention is not limited to this, and the number of pockets C1 ... may be any number,
According to the number, it is intermittently rotated by a predetermined angle.

[0035]

Since the present invention has the above-mentioned structure, it has the following advantages.

1. With an arcuate track in which the folding piece of the inner body flap formed in a comb tooth shape gradually enters from the corner located on the inner body flap side of the folding surface of the box-shaped contents to the inside of the box-shaped contents from the folding surface. By rocking
The tip of the folding piece hits the inner body flap at the corner and bends the base of the inner body flap along the corner, and then the folding piece is folded while deforming the elastic body in the anti-elastic direction by the reaction force from the folding surface. Fold the inner body flap along the surface while squeezing it, and then, even if the inner body flap that was once folded by friction due to the return movement of the folding piece of the inner body flap tries to return to the anti-folding direction, the comb-shaped tip of the second holding surface It is prevented from returning to the anti-folding direction by hitting the portion, and the folding piece of the outer body flap formed like a comb tooth likewise from the corner located on the outer body flap side of the folding surface of the box-shaped contents. By swinging in an arcuate orbit that gradually enters the box-shaped contents from the folding surface, the tip of the folding piece hits the outer body flap at the corner. The base of the outer body flap is bent along the corner, and then the folding piece is folded along the folding surface while squeezing the outer body flap while deforming the elastic body in the anti-elastic direction by the reaction force from the folding surface. Since the outer body flap and the inner body flap, which have a large length in the folding direction, are squeezed from the corners of the folding surface of the box-shaped contents, the inner body flap is returned by the return movement of the folding piece. It is possible to completely prevent the body flap from returning in the anti-folding direction.

Therefore, the swinging loci of the folding pieces of the inner body flap and the folding pieces of the outer body flap pass through the positions away from the corners of the folding surface of the box-shaped contents and collide with the body flaps. While drawing a circular arc that presses against the folding surface of the box-shaped contents in the vicinity, when the folding piece of the inner body flap returns, the inner body flap that was once folded due to friction with the inner body flap moves in the anti-folding direction. Compared to the conventional one that has a trouble to return,
It can be tightly heat-bonded to improve the appearance of the finished product and significantly improve the product value.

2. By arranging a temporary heater in the rear of the folding piece of the outer case flap in the swinging direction, the temporary heater comes into contact with the overlapping portion of the inner case flap and the outer case flap after finishing the folding of the outer case flap. Since the heater is temporarily attached, it is possible to prevent the heater from directly contacting the body flap even when the outer body flap is stopped during the folding operation.

Therefore, when the folding operation of the outer body flap is stopped midway due to inching or the like, the heater is also in contact with the overlapping portion of the inner body flap and the outer body flap, so that the overlapping portion is scorched. It does not undergo thermal deformation or heat deformation and the appearance of the finished product is improved, significantly improving the commercial value.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional front view of a body folding device of a packaging machine showing an embodiment of the present invention, in which a folded state is partially cut away.

FIG. 2 is a partially reduced vertical sectional side view showing a state after folding along the line (2)-(2) in FIG.

FIG. 3 is a partially reduced vertical side view taken along the line (3)-(3) of FIG.

FIG. 4 is a reduced vertical cross-sectional front view of the entire apparatus, which is indicated by a solid line during loading.

[Explanation of symbols]

A Box-shaped contents A5 Folding surface A6 Corner part A7 Corner part B Encapsulation material B1 Outer body flap B2 Inner body flap C Turret C1 Pocket T1 Arc track T2 Arc track 1 First clamping surface 1a Tip (comb-shaped tip part) ) 2 2nd clamping surface 2a Tip part (comb-like tip part) 6 Inner body flap folding piece 6a Tip 6b Swing arm 6c Elastic body 7 Outer body flap folding piece 7a Tip 7b Swing arm 7c Elastic body 7f Temporary Attached heater

Claims (2)

[Claims] 1. The box-shaped contents A are abutted against the encapsulation material B, and the encapsulation material B is wound around the box-shaped contents A in a U-shape, and then the outer periphery of the turret C is kept in this state. It is loaded into the radially provided pockets C1 ... In the body folding device of a wrapping machine, the tip portion 1a of the first sandwiching surface 1 that faces the outer body flap B1 of the packaging material B protruding from the box-shaped contents A of the pockets C1 ...
And the tip portion 2a of the second sandwiching surface 2 that faces the inner body flap B2 of the encapsulating material B protruding from the box-shaped contents A, the convex portion in the left-right direction orthogonal to the protruding direction of these body flaps B1 and B2. And concave portions are alternately formed in a comb-teeth shape, and the folding piece 7 of the outer body flap B1 and the inner body flap B are formed.
The two folding pieces 6 are formed in a comb-teeth shape so that the respective tips 7a, 6a are fitted with the comb-teeth-shaped tip portions 1a, 2a of the first clamping surface 1 and the second clamping surface 2, respectively. The first holding surface 1 and the second holding surface 2 are swingably supported in a direction in which they are fitted with the comb-teeth shaped tip portions 1a, 2a, and the tip portions 7a, 6a are attached to the swing arms 7b, 6b. A is reciprocally mounted in a direction approaching or separating from the folding surface A5 of A, and the tip 7a, 6a is placed between the tip 7a, 6a and the swing arms 7b, 6b.
While the elastic body 7c, 6c is interposed so that 6a is constantly pressed toward the folding surface A5 of the box-shaped contents A, the tip 7a,
The elastic movement amount of 6a is regulated, and the tip ends 7a, 6a are rocked by the rocking arms 7b, 6b, and the corners A7, A located on the body flap B1, B2 side of the folding surface A5 of the box-shaped contents A are folded.
A cylinder folding device for a packaging machine, characterized in that it is moved along arcuate orbits T2 and T1 which gradually enter the box-shaped contents A from 6 from the folding surface A5. 2. The folding piece 7 of the outer body flap B1.
The cylinder folding device for a packaging machine according to claim 1, wherein a temporary heater 7f is continuously provided behind the swinging direction.