JP4377668B2 - Folding device for packaging machine - Google Patents

Description

  The present invention relates to a folding apparatus for a packaging machine in which a packaging sheet such as a film or the like is wrapped or wound on a workpiece such as various products to wrap each flap with a clean fold.

In general, as this type of packaging machine in which a film is folded or wound on a work and each flap is folded and packaged, there is, for example, one described in Patent Document 1 below.
In Patent Document 1, a work is transported on a conveyor in a state where the work is lowered and a packaging sheet having a predetermined size is folded and wound. And about each flap of the packaging sheet which protrudes on the both sides of a workpiece | work, a folding guide is raised and moved, and a lower flap is folded up. Thereafter, when the folding guides on both sides are moved in the direction approaching each other and the side flaps are sequentially folded onto the folded lower flaps, the upper flaps are folded up into a substantially triangular shape and remain. Next, by lowering the folding guide, the upper flap is folded and the folding of the flap is completed.
JP-A-5-65118

However, since the packaging machine described in Patent Document 1 has a structure in which another flap is folded on another guide while pressing the flap with the guide, it cannot be folded up to the edge of the corner of the workpiece. Therefore, there has been a drawback that the folds of the packaging sheet cannot be formed cleanly. In particular, when the packaging sheet is a soft film or the like, there is a drawback that a more beautiful fold cannot be formed.
In view of such circumstances, an object of the present invention is to provide a folding device for a packaging machine that can be folded and folded at the ridgeline of a workpiece.

The folding device of the packaging machine according to the present invention is configured such that a workpiece is pressed against a packaging sheet to be folded or wound, and the first flap of the packaging sheet surrounding the workpiece and the side flaps on both sides thereof are folded for packaging. In the packaging machine
A first folding member that folds the first flap by relative movement of the workpiece, a second folding member that sandwiches one side flap between the first folding member, and the other between the first folding member. Ri Na and a third folding member folded across the side flaps, as on both sides of the first folding member tucked the first flap through the side flaps the second folding members and the third folding member located The first folding member and the second folding member are respectively movable in a direction in which the folding members are arranged, and the first folding member is folded in the first folding member while moving in the second folding member direction. After that, the first and second folding members are moved in the direction of the third folding member with one side flap being sandwiched between the first and second folding members. Characterized in that it was so folded the-up.
The work is moved relative to each other, and the packaging sheet is folded or wound, and the first flap is folded by the first folding member by the relative movement of the work. Next, after sandwiching one side flap between the first folding member and the second folding member and folding the first flap to the workpiece ridgeline, the first and second folding members are moved while sandwiching the one side flap. Thus, before the first flap is inflated, one side flap is overlapped on the first flap and folded into the workpiece.
Further, the first folding member is movable in the direction of the third folding member, and the workpiece is moved relative to the third folding member while the other side flap is sandwiched between the first and third folding members. The side flaps may be folded.

The folding device of the packaging machine according to the present invention is configured such that a workpiece is pressed against a packaging sheet to be folded or wound, and the first flap of the packaging sheet surrounding the workpiece and the side flaps on both sides thereof are folded for packaging. In the packaging machine
A first folding member that folds the first flap by relative movement of the workpiece, a second folding member that sandwiches one side flap between the first folding member, and the other side between the first folding member And a third folding member that is folded with the flap interposed therebetween, and is arranged so that the second folding member and the third folding member are positioned on both sides of the first folding member that has folded the first flap through the side flaps, respectively. The first folding member is movable in the direction of the third folding member, and the workpiece is moved relative to the third folding member side with the other side flap sandwiched between the first and third folding members. The side flaps are folded .
The work is moved relative to each other, and the packaging sheet is folded or wound, and the first flap is folded by the first folding member by the relative movement of the work. Next, after the first flap is folded to the workpiece ridge line on the other side flap side by the movement of the first folding member, the other side flap is overlapped on the first flap before the first flap is expanded. In this case, the other side flap may be folded by moving the workpiece with respect to the first and third folding members sandwiching the other side flap, or the first and third folding members may be folded with respect to the workpiece. You may form a fold by moving.

The third folding member may be provided with a guide slit for folding the second flap facing the first flap.
The second flap can be folded by relatively moving the workpiece along the guide slit. At that time, the guide slit is formed so as to be inclined so that the second flap is gradually folded into the workpiece with respect to the relative movement direction of the workpiece.
Further, the first folding member and the second folding member may be provided with inclined surfaces for sandwiching the packaging sheet, respectively.
Further, the first folding member and the third folding member may be provided with inclined surfaces for sandwiching the packaging sheet, respectively.
By sandwiching one or the other side flap along the inclined surface, a beautiful fold can be formed at the corner ridgeline during cooperative folding. In that case, it is preferable that the inclined surface of each opposing folding member inclines in the same direction and opposes. As a result, the side flaps can be smoothly sandwiched and wrinkles can be prevented, and the folds can be formed cleanly during subsequent folding. Further, if one inclined surface of the first flap is formed by the first and second inclined surfaces having a substantially V shape in a plan view, after the side flap is sandwiched, the folding is guided in order to guide the folding with the second inclined surface. The seat can be folded smoothly without excessive load, and the first inclined surface does not interfere with the folding of the side flap edge, and the folded side flaps move relative to each folding member. It can be prevented from being caught and peeled off.
In the present invention, sandwiching the side flap between the two folding members means that the two folding members are brought into contact with the side flap to form a sandwiched state, and one or both of the two folding members are side flaps. It also includes a state in which the side flaps are restrained to such an extent that they are prevented from bending or bulging due to their own weight even if they are not brought into contact with each other. Then, the side flap can be folded over the first flap or the workpiece with a clean crease from the vicinity of the corner ridge line by the relative movement of the workpiece and the two folding members.

  As described above, the folding device of the packaging machine according to the present invention can form a beautiful crease even if the packaging sheet is soft. In particular, since the side flaps are folded in cooperation with the two folding members, a crease can be formed cleanly at the workpiece corner ridgeline.

Hereinafter, a packaging device according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view for explaining an outline of a process of stacking and packaging boxes for each stacking unit in a packaging machine, FIGS. 2 and 3 are side views of essential parts of the folding apparatus, plan views of essential parts, and FIG. FIG. 5 is a perspective view showing a folding guide of each flap, FIG. 6 and FIG. 7 are front views and rear views of the driving mechanism, and FIG. 8 is each flap by the folding guide. It is a figure which shows the folding process.
The packaging machine 1 shown in FIG. 1 uses, as a unit unit, a rectangular parallelepiped box (hereinafter simply referred to as a box) b such as a tissue box as a work, which is arranged in an appropriate number of plural, for example, five pieces in close contact with each other. The integrated unit B is a device that is packaged with a packaging sheet such as a plastic film f. In the present embodiment, a soft unstretched plastic film made of, for example, a polyethylene film is used as the film f.

In the packaging process by the packaging machine 1, first, the boxes b that are sequentially manufactured are arranged in the same direction in close contact with each other, and are transported by the accumulation transport device 2. In the carrying step, the adjacent boxes b are separated from each other and then closely attached to each other to form the integrated unit B. Then, the integrated unit B is sent upward by the elevator 9. On the other hand, in the film feeding device 3, a strip-shaped plastic film fo made of polyethylene or the like is wound around a roll 4, and the film fo is fed out from the roll 4 and cut by a film cutting means 5 at a predetermined length.
Then, in a state where the cut film f is held horizontally by a belt pulley (not shown), the integrated unit B that is lifted by the elevator is pressed from below and wrapped with the film f and wrapped. The film f protrudes from both end faces of the integrated unit B in the body-folded state of the film f, and as shown in FIG. Both side flaps are f3 and f4, and the lower portions f2a and f2b of the film f are suspended in an unwrapped state. The lower flap f2 is formed by winding the lower portions f2a and f2b around the integrated unit B. Then, the flaps f1 to f4 are sequentially folded on the end faces B1 and B2 of the integrated unit B to complete the packaging, and then sealed.

In the packaging machine 1 having the outline process of the accumulation of the boxes b and the packaging with the film f, for example, the folding device 6 that winds and wraps the accumulation unit B with the film f cut into a substantially square shape having a width of about 780 mm will be described below. explain.
In the packaging machine 1 shown in FIG. 1, the film feeding device 3 is disposed on the extension line of the flat belt conveyor of the stacking and conveying device 2 that conveys the box b so as to be substantially opposed to each other. The folding device 6 is arranged in a direction substantially perpendicular to the conveyance path of the box b, and is wrapped around with the film f while conveying the integrated unit B. Moreover, the folding device 6 is disposed so as to be deviated in the vertical direction with respect to the conveyance path of the box b, and the stacking unit B on the conveyance path is lifted by the elevator 9 so as to be folded and wrapped with the film f.
In the folding device 6 shown in FIGS. 2 and 3, the film f cut into a substantially square shape is conveyed to the position of the elevator 9 that raises the integrated unit B by a belt pulley (not shown) and is held stationary. On the upper side of the stationary film f, a paddle mechanism 10 that holds the integrated unit B in which the film f is folded is disposed in a stationary state (see FIG. 2). The paddle mechanism 10 includes a pair of upper paddles 12 and 12 supported by an endless chain 11, and a plurality of paddle mechanisms 10 are supported and arranged at predetermined intervals by the endless chain 11. The endless chain 11 is wound between a pair of chain wheels (not shown) and is intermittently conveyed by a driving source such as a motor to intermittently convey each paddle mechanism 10. Each paddle mechanism 10 sandwiches both side surfaces of the stacking unit B with a pair of upper paddles 12 and 12 via a film f in a body-folded state. Intermittent conveyance is performed by a pair of upper paddles 12 and 12 constituting the paddle mechanism 10. The distance from the receiving position of the stacking unit B to the pair of upper paddles 12 and 12 of the adjacent paddle mechanism 10 moving to the receiving position of the stacking unit B is set as one pitch.

In the folding device 6 shown in FIGS. 3 and 4 (b), a pair of beam portions 14 and 14 are arranged in parallel on the outer sides of both end faces B1 and B2 of the integrated unit B supported by a paddle mechanism 10 (not shown). ing. Two slide guides 15a and 15b are attached to each beam portion 14, respectively. An arm 16a is attached to each slide guide 15a via an attachment portion 16b so as to be slidable in a direction substantially perpendicular to the beam portion 14. An adjustment arm 17a is attached to each arm 16a so as to be extendable in the length direction, and an upper folding guide 18 for folding the upper flap f1 of the integrated unit B onto the end surface B1 (B2) at the tip of the adjustment arm 17a. First folding members) are respectively attached.
Therefore, when the integrated unit B is raised by the elevator 9 and the film f is folded, the both side surfaces are held by the paddle mechanism 10 and at the same time the upper folding guides 18 and 18 project to the both end surfaces B1 and B2 side. The flaps f1 and f1 are folded downward (see FIG. 5).
Two elongated holes 19a are formed in each adjustment arm 17a. Each arm 16a is provided with a key 19b and a lock member 19c which are slidably fitted in the long hole 19a. By moving the adjustment arm 17a in a direction perpendicular to the beam portion 14 with respect to each arm 16a, The distance between the pair of upper folding guides 18 and 18 can be adjusted. As a result, the integrated units B having different sizes can be folded. The arm 16a, the adjustment arm 17a, the long hole 19a, the key 19b, and the lock member 19c constitute an expansion / contraction mechanism 19.

3 and 4A, rear folding guides 20 and 20 (second folding members) for folding one side flap f3 are disposed adjacent to the upper folding guides 18 and 18, respectively. . Each rear folding guide 20 is connected to the adjustment arm 17b. The adjustment arm 17b is attached to an arm 16c having a mounting portion 16d slidably connected to a slide guide 15a connected to the beam portion 14 so as to be extendable and contractable. Moreover, similarly to the upper folding guide 18, the arm 16 c, the adjustment arm 17 b, the long hole 19 a, the key 19 b, and the lock member 19 c provided on the rear folding guide 20 constitute an expansion / contraction mechanism 19. Thus, the interval between the rear folding guides 20 and 20 can be adjusted according to the distance between the end surfaces B1 and B2 of the integrated unit B.
As shown in FIG. 5, a front folding guide 21 (third folding member) for folding the other side flap f4 on the opposite side of the rear folding guide 20 across the upper folding guide 18 is disposed in a fixed state. The gap between the front folding guides 21 and 21 is also adjustable. On the other hand, the upper folding guide 18 and the rear folding guide 20 can be reciprocated in the horizontal direction.
Here, the upper folding guide 18 forms a substantially V-shaped surface 18a (inclined surface) in which the surface in the thickness direction facing the rear folding guide 20 has two inclined surfaces 18a1 and 18a2 in plan view. The surface in the thickness direction opposite to the surface is an inclined surface 18b. The V-shaped surface 18a is inclined such that the first inclined surface 18a1 is inclined so as to approach the rear folding guide 20 as it is separated from the end surface B1 (B2), and the first inclined surface 18a is inclined so as to be separated from the rear folding guide 20 as it is separated from the end surface B1 (B2). It is formed with two inclined surfaces 18a2. A surface in the thickness direction of the rear folding guide 20 facing the substantially V-shaped surface 18a of the upper folding guide 18 is an inclined surface 20a inclined in the same direction as the first inclined surface 18a1. An end surface of the front folding guide 21 facing the inclined surface 18b of the upper folding guide 18 is also an inclined surface 21a inclined in the same direction as the inclined surface 18b.
By arranging the V-shaped surface 18a and the inclined surface 20a of the upper folding guide 18 and the rear folding guide 20 to face each other, when sandwiching the side flap f3, it can be sandwiched near the corner ridgeline of the end surface B1 (B2), Thereby, a crease can be formed in the vicinity of the corner ridgeline. In the inclined surface 21a of the front folding guide 21 and the inclined surface 18b of the upper folding guide 18, the end surface 18b is formed in a V shape in plan view, thereby suppressing resistance when the side flap f4 is sandwiched and reducing the load on the film f. Can be reduced.

In FIG. 2, the front folding guide 21 has a slit guide 22 (fourth folding member) formed in a diagonal direction from the lower end to the upper end at a position separated from the inclined surface 21a. The slit guide 22 guides the lower flap f2 to enter from the lower end and gradually bend upward when moving the integrated unit B toward the front folding guide 21. In particular, one end portion forming the slit guide 22 constitutes a tapered portion 22a located on the upper folding guide 18 side, and has a chamfered shape continuous from the lower end to the upper end of the front folding guide 21. The other end portion forming the slit guide 22 also constitutes a tapered portion 22b that is inclined in the same direction as the tapered portion 22a. The lower flap f2 is guided in the gap between the taper portions 22a and 22b to guide folding.
By inclining the opposing surfaces in the thickness direction of the folding guides 18, 20, 21 in the same direction, when folding both side flaps f 3, f 4, near the corner ridge lines of the end surfaces B 1, B 2 of the integrated unit B. The upper folding guide 18 can enter and smoothly fold along the inclined surface with the side flaps f3 and f4 sandwiched between the other folding guides 20 and 21.

Also, a pair of endless belts 23 and 24 are arranged on both sides of the end faces B1 and B2 of the trunk-folded integrated unit B inside the beam portions 14 and 14 shown in FIGS. Each endless belt 23, 24 is hung on a pair of sprockets so as to be able to rotate forward and reverse. As shown in FIG. 4A, a rear body folding guide 25 is connected to one linear portion 23a, 24a of each endless belt 23, 24 by connecting portions 25a, 25a at both ends thereof. In FIG. 4B, the front body folding guide 26 is connected to the other linear portions 23b, 24b facing each other of the endless belts 23, 24 at both end connecting portions 26a, 26a. 4A and 4B show only one connection structure between the endless belts 23 and 24 and the connection portions 25a and 26a.
The rear body folding guide 25 is for folding one lower part f2a of the film f in the body folded state into the lower surface of the integrated unit B, and the front folding guide 26 is for folding the other lower part f2b.
Further, the connecting members 25a, 25a, 26a, 26a at both ends of the body folding guides 25, 26 are slidably attached to slide guides 15b, 15b provided on the beam portions 14, 14, respectively. Guided. Then, by rotating the endless belts 23 and 24 forward and backward, the rear trunk fold guide 25 and the front trunk fold guide 26 can be approached and separated. By bringing the both cylinder folding guides 25 and 26 closer, the lower portions f2a and f2b of the film f are folded on the lower surface of the integrated unit B to form the lower flap f2 (see FIG. 5).

Next, the drive mechanism of the folding device 6 will be described with reference to FIGS. In FIG. 6, a transmission belt 29 wound around a drive source 28 includes a driving pulley 30 for an upper folding guide 18, a driving pulley 31 for a rear folding guide 20, and body folding guides 25 and 26 supported by a substrate 27. It is wound around the driving pulley 32 to transmit the driving force.
The driving pulley 30 of the upper folding guide 18 transmits a rotational force to a swing shaft 34 provided with a swing cam mechanism (not shown) by the rotation thereof to swing the lever 34a, and the swing mechanism shown in FIG. The swing lever 36 is swung around the shaft 36 a via 35. As a result, the upper folding guide rod 37 connected to the other end of the swing lever 36 is reciprocated in the horizontal direction. An upper folding guide 18 is connected to the other end of the upper folding guide rod 37, whereby the upper folding guide 18 is reciprocated between the rear folding guide 20 and the front folding guide 21 arranged on the left and right (FIG. 5). reference).
Similarly, the driving pulley 31 of the rear folding guide 20 also transmits its rotation to the swing shaft 39 provided with the swing cam mechanism to swing the lever 39a, and the swing lever 40 via the swing mechanism 40. 41 is swung around the shaft 41a. As a result, the rear folding guide rod 42 connected to the other end of the swing lever 41 is reciprocated in the horizontal direction. The rear folding guide 20 is connected to the other end of the rear folding guide rod 42, and thereby the rear folding guide 20 is reciprocated (see FIG. 5). Then, the rear folding guide 20 folds one side flap f3 in conjunction with the upper folding guide 18 in the forward process.
Next, a disk 32a shown in FIG. 2 is coaxially attached to the driving pulley 32 of the body folding guides 25 and 26, and a crank lever 44 is connected to the disk 32a as shown in FIG. The other end is connected to one connecting portion 25a of the rear cylinder folding guide 25 (or the front cylinder folding guide 26). Therefore, the rear body folding guide 25 can be reciprocated along the slide guides 15b and 15b by the crank movement by the crank lever 44. Since the rear trunk fold guide 25 and the front trunk fold guide 26 are fixed to the endless belts 23 and 24, the front trunk fold guide 26 is interlocked with the reciprocating movement of the rear trunk fold guide 25, so 26 can be approached and spaced apart.

The folding device 6 according to the present embodiment has the above-described configuration. Next, the operation will be described with reference to FIG. FIGS. 8A to 8H show a plan view and a side view of the folded portion of the film f.
First, in FIG. 2 and FIG. 8A, the film f cut to a predetermined size is sandwiched between belt pulleys, conveyed to the receiving position of the integrated unit B below the paddle mechanism 10, and held stationary. On the other hand, the stacking units B arranged in close contact with each other by the stacking and transporting apparatus 2 are transported and placed on the elevator 9 below the film f that is held stationary. Then, by raising the elevator 9, the integrated unit B wraps the film f in a cylinder fold and the both side surfaces are held between the upper paddles 12, 12 of the paddle mechanism 10.
At this time, the rear and front folding guides 20 and 21 are stopped with a gap approximately equal to the lateral width of the end surface B1 (B2) of the integrated unit B, and the upper folding guide 18 is separated from the rear and front folding guides 20 and 21, respectively. This is set at the approximate center position, and this is set as the initial position (see FIG. 5). The horizontal length of the upper folding guide 18 is set to be equal to or less than the width obtained by subtracting the horizontal length in the state where the side flap f3 is folded to the end surface B from the lateral (horizontal) width of the end surface B. When the stacking unit B is raised, the body f of the case-folded film f is bent downward by the upper folding guides 18 and 18 at the center of the upper flap f1 projecting from both end surfaces B1 and B2 of the stacking unit B. , B2 (see FIGS. 5 and 8B). The upper folding guide 18 presses the upper flap f1 from the corner ridge line with the upper surface of the integrated unit B to the lower end, and folds it on the end surfaces B1 and B2.
Thereafter, the drive source 28 of the drive mechanism is driven. Then, the driving pulley 30 for the upper folding guide 18 rotates in conjunction with the transmission belt 29 to swing the swinging lever 36 in the right direction in FIGS. 2 and 6, and the upper folding guide rod 37 is pulled. As a result, the upper folding guide 18 is moved in the direction of the rear folding guide 20 while pressing the upper flap f1 against the end surface B1 (B2), and the upper flap is folded to the corner ridge line on the rear folding guide 20 side of the end surface B1 (B2). Then, one side flap f3 is sandwiched between the V-shaped surface 18a and the inclined surface 20a of the rear folding guide 20 in the vicinity of the longitudinal corner ridgelines of the end surfaces B1 and B2 (see FIG. 8C).

Then, the driving pulley 32 of the body folding guide is interlocked with the driving pulley 30 to push the crank lever 44 to the left in FIG. Therefore, the rear trunk fold guide 25 moves in the direction of the front trunk fold guide 26, and the front trunk fold guide 26 also moves in the direction of the rear trunk fold guide 25 via the interlocking endless belts 23, 24 and approaches each other. As a result, as shown in FIGS. 5 and 8C, 8E, and 8F, the two lower parts f2a and f2b of the film f that hangs down on both lower sides of the integrated unit B are folded to the back surface of the integrated unit B. A lower flap f2 is formed.
In this process, the driving pulley 31 of the rear folding guide is also interlocked with the driving pulley 30, so that the rear folding guide rod 42 is pushed leftward in FIGS. As a result, the rear folding guide 20 moves to the front folding guide 21 side together with the upper folding guide 18, and presses the side flap f3 onto the upper flap f1. When the rear folding guide 20 starts to overlap the side flap f3 on the upper flap f1, the portion of the side flap f3 that has not been pressed still falls to the upper folding guide 18 side. The fallen side flap f3 is relatively moved along the second inclined surface 18a2 of the upper folding guide 18 by the movement of the rear folding guide 20 and the upper folding guide 18, and is finally folded onto the upper flap f1 by the rear folding guide 20. They are overlaid (see FIG. 8D).
Then, the rear trunk folding guide 25 finishes bending the lower part f2a of the film f on the rear folding guide 20 side to the back surface (see FIG. 8E). In this state, the lower part f2b of the other film f hangs down on the back surface where the folding does not end. Next, the upper folding guide 18 folds the upper flap f1 to the corner ridge line on the front folding guide 21 side, and sandwiches the fourth flap f4 between the inclined surface 18b and the inclined surface 21a of the front folding guide 21.
Next, the paddle mechanism 10 that holds the stacking unit B starts intermittent movement. By moving the stacking unit B toward the front folding guide 21 and moving the rear and front body folding guides 25 and 26 closer, the front body folding guide 26 folds the lower part f2b of the film f over the lower part f2a and folds it down. f2 is formed. Then, the rear and front body folding guides 25 and 26 come into contact with each other (FIG. 8 (f). The folding portion of the side flaps f3 and f4 is moved to the rear folding guide 20, the upper folding guide 18, and the front folding guide by the movement of the integrated unit B. The first inclined surface 18a of the upper folding guide 18 and the inclined surface 21a of the front folding guide 21 are inclined surfaces that are separated from the end surface B1 (B2), and the edge of the side flap f3 is caught. There is no.

The side flap f4 is sandwiched between the front fold guide 21 and the upper fold guide 18 by the movement of the stacking unit B toward the front fold guide 21, and the corner of the side surface of the stack unit B is inclined by the inclined surface 21a of the front fold guide 21. It folds onto the side flap f3 from the vicinity of the ridgeline (FIG. 8 (f)), and the end flaps B1, B2 are folded on the end faces B1, B2, and the end faces B1, B2 is pressed by the front folding guide 21. At this time, the lower flap f2 is maintained in a state of protruding outward from the end faces B1 and B2.
When the integrated unit B covered with the film f is further moved by the paddle mechanism 10, the lower flap f2 is guided into the slit guide 22 (see FIG. 8 (g)), and the slit guide 22 that gradually moves upward is moved. The lower flap f2 is gradually folded upward as guided by the tapered portions 22a and 22b to be formed (see FIG. 8 (h)). Then, at the upper end of the slit guide 22, the lower flap f2 is folded over the end faces B1, B2 and the side flaps f1, f3, f4. This ends the folding.

As described above, according to the present embodiment, each flap can be folded at each corner ridgeline formed on the end surfaces B1 and B2 of the integrated unit B, and a beautiful crease can be formed. Regarding the folding of the boundary between the upper flap f1 and the side flaps f3 and f4, which are particularly difficult to form a beautiful fold, the side flaps f3 and f4 are folded with the upper flap f1 folded to the edge of the corner by the upper folding guide 18. Therefore, a beautiful crease can be formed. Even if the film is a soft unstretched plastic film made of, for example, a polyethylene film, a fold can be formed cleanly. Further, since the flaps f1, f3, and f4 after being folded are always pressed by any of the folding guides 18, 20, and 21, the flaps are folded and then swelled so that the folds are collapsed or deformed. There is no.
Moreover, folding of the upper and lower flaps f1 and f2, side flaps f3 and f4 and body folding of the film f can be performed continuously in one region, the packaging line can be set short, and the area occupied by the apparatus can be reduced. .

Note that, as the film f, instead of the above-described unstretched plastic film, a work-cured film such as paper, OPP, or CPP may be used, and these films and paper constitute a packaging sheet.
Further, the work to be stacked and transported in the present invention is not limited to the stacking unit B of the box b, and can be applied to various products. Moreover, it is not limited to the thing which accumulated several workpiece | work, The same packaging can be performed also with a single-piece workpiece | work.
Further, as shown in FIG. 2, auxiliary guides 46 and 46 are provided at the front end portions of the rear folding guide 20 and the front folding guide 21 so that the side flaps f3 and f4 made of the soft film f are not wound. It may be.

It is a perspective view explaining the outline of the process of accumulating and packaging a box for every accumulation unit in the packaging machine by an embodiment of the invention. It is the principal part side view which looked at each folding guide from the centerline O side of the folding apparatus shown in FIG. It is a principal part top view of the folding apparatus shown in FIG. (A) is an A'-A 'line sectional view showing a connection mechanism of a back trunk folding guide and an endless belt, and (b) is an AA line sectional view showing a connection mechanism of a front trunk folding guide and an endless belt. is there. It is a perspective view which shows each folding guide. It is a front view of the drive mechanism containing a drive source. It is a rear view of the drive mechanism shown in FIG. (A)-(h) is a figure which shows the folding process of the flap by each folding guide.

Explanation of symbols

1 Packing machine 6 Folding device 9 Elevator (conveyance means)
10 Paddle mechanism 18 Upper folding guide (first folding member)
18a V-shaped surface (inclined surface)
18b, 20a, 21a Inclined surface 20 Rear folding guide (second folding member)
21 Forward folding guide (third folding member)
22 Slit guide (fourth folding member)
25 Rear body folding guide 26 Front body folding guide B Integrated unit (workpiece)
f Film (packaging sheet)

Claims (6)

In a packaging machine in which a workpiece is pressed against a packaging sheet to be folded or wound, and the first flap of the packaging sheet surrounding the workpiece and the side flaps on both sides thereof are folded to wrap.
A first folding member that folds the first flap by relative movement of the workpiece, a second folding member that sandwiches one side flap between the first folding member, and the other between the first folding member. Ri Na and a third folding member folded across the side flaps, said the second folding members and the third folding member positioned through each of the side flaps on both sides of the first first folding members tucked flap Arranged to
The first folding member and the second folding member are respectively movable in the direction in which the folding members are arranged, and after the first folding member is folded in the first folding member while moving in the direction of the second folding member. A folding apparatus, wherein the first and second folding members sandwich one side flap and move toward the third folding member to fold the one side flap . In a packaging machine in which a workpiece is pressed against a packaging sheet to be folded or wound, and the first flap of the packaging sheet surrounding the workpiece and the side flaps on both sides thereof are folded to wrap.
A first folding member that folds the first flap by relative movement of the workpiece, a second folding member that sandwiches one side flap between the first folding member, and the other between the first folding member. And a third folding member that is folded with a side flap interposed therebetween, and the second folding member and the third folding member are positioned on both sides of the first folding member that has folded the first flap through the side flap, respectively. Arranged so that
The first folding member is movable in the direction of the third folding member, and the workpiece is moved relative to the third folding member while the other side flap is sandwiched between the first and third folding members. A folding apparatus characterized in that the other side flap is folded . The first folding member is movable in the direction of the third folding member, and the workpiece is moved relative to the third folding member while the other side flap is sandwiched between the first and third folding members. The folding device according to claim 1, wherein the other side flap is folded.   The folding device according to any one of claims 1 to 3, wherein the third folding member is provided with a slit guide for folding the second flap facing the first flap.   5. The folding device according to claim 1, wherein each of the first folding member and the second folding member is provided with inclined surfaces for sandwiching and folding the packaging sheet.   The folding device according to any one of claims 1 to 5, wherein the first folding member and the third folding member are each provided with an inclined surface for sandwiching and folding the packaging sheet.

Images