JP2014091532A - Rear side flap folding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a folding device of a rear side flap of a wraparound sheet jointly and easily for a wraparound sheet having a different size.SOLUTION: Both conveyance chains 44 of a transportation conveyor 20 for conveying a wraparound sheet on which a container group is loaded are mounted on a pair of machine casings 26 capable of adjusting an interval, and a pair of rear side flap folding means 66 for folding rear side flaps on both sides in the engaged state from the back are mounted on the pair of machine casings 26, respectively. When the size of the wraparound sheet is changed, the width of the transportation conveyor 20 is adjusted by moving the machine casings 26, and simultaneously the interval of the side flap folding means 66 is also adjusted.

Description

  The present invention relates to a device for bending a rear side flap connected to both sides of a rear flap of a wrap round sheet, and particularly to a rear side flap bending device that can be easily used for various sizes of wrap round sheets. It is.

  Place a predetermined number of containers and other articles on the bottom of the wrap round sheet supplied with the front flap upright, and fold the front and rear flaps and the side flaps provided on both sides of these flaps. Conventionally, a wrap round caser that wraps the article by wrapping the article is known (for example, see Patent Document 1).

  The wrap round caser described in Patent Document 1 (the name of the invention is a corrugated cardboard caser) is provided with a flap folding device that folds a rear side flap, and is a filled product (a wrap round sheet on which the product is placed). When passing the sheet to the downstream transport device, the flap folding device folds the side flap and raises the rear panel (rear flap in the present invention). As an example of a specific configuration of this flap folding device, a holding piece capable of holding a side flap and a rear panel is brought into contact with a chain drive to convey a filled product downstream while performing predetermined folding. Like to do.

JP 2001-48123 A

  Recently, a single wrap round caser is often requested to be used for wrap round sheets and articles of different sizes. However, the wrap round caser described in Patent Document 1 is often used as such a wrap round caser. The configuration for doing so is not considered at all. In addition, it is not known at all about the rear side flap folding apparatus that can be used for such different-sized wrap round sheets.

  The present invention has been made in order to solve the above-described problem, and a wrap round sheet supply means for supplying a wrap round sheet for wrapping a container group placed on a bottom surface in a state where a front flap is raised, A wrap round sheet transport conveyor that has at least a pair of endless transport bodies provided on a pair of adjustable machine frames, receives the wrap round sheet and transports it downstream, and a rear flap of the wrap round sheet. A rear flap standing means for contacting and standing; and a rear side flap bending means for abutting and bending a rear side flap connected to both sides of the rear flap via a folding line, the rear side flap bending means, Abutting members supported rotatably on the machine frame with a horizontal axis as a fulcrum, and rotating these abutting members And a driving means for, during standing operation by the rear flap upright means, characterized in that folding the rear side flaps.

  According to a second aspect of the present invention, in the first aspect of the present invention, the drive means for rotating the contact member is a servo motor, and the contact member is arranged on the rear side according to the type of wrap round sheet to be processed. The time for holding the folded state in contact with the flap can be adjusted.

  Furthermore, a third invention is the first invention or the second invention, wherein the side guides on both sides of the machine frame can be moved in the conveying direction of the wrap round sheet, and the lap round sheet is approached and separated on both sides. When the wrap round sheet is sent to the wrap round sheet transport conveyor, the side guide is moved in the direction opposite to the transport direction so that it is connected to both sides of the front flap via a fold line. The front side flaps are folded, and the side guides are moved in the conveying direction during the folding operation of the rear side flaps, and separated from each other, thereby avoiding interference with the rear side flaps.

  In the first aspect of the invention, by adjusting the interval of the machine frame, it is possible to adjust the interval of the rear side flap folding means together with the wrap round sheet conveying conveyor, which is excellent in duality and easy to perform dual operations. Can do. Further, since the rear side flap is bent at the same time as the rear flap standing operation, the processing section can be shortened.

  Further, in the second invention, since it is possible to adjust the time for the rear side flap bending means to contact the rear side flap, it is possible to stably guide the side guide regardless of the length of the rear side flap. And a stable rear side flap folding operation can be performed.

  Further, in the third invention, when the wrap round sheet conveying conveyor receives the wrap round sheet on which the container group is placed, the side guide is advanced, and the side of the container group is made to follow the movement of the sheet. When the rear side flaps are bent, the side guides are moved in the transport direction, and by widening the gap, the interference with the rear side flaps bent forward is prevented and stable side Flap folding operation can be performed.

FIG. 1 is a plan view of a wrap round caser provided with a rear side flap bending apparatus according to an embodiment of the present invention. Example 1 FIG. 2 is a side view of the wrap round caser. FIG. 3 is a plan view of a wrap round sheet handled by the wrap round caser. FIG. 4 is a cross-sectional view crossing the transport direction of the wrap round caser. FIG. 5 is an enlarged plan view showing an upstream portion of the wrap round sheet conveyance conveyor. FIG. 6 is a side view of FIG. FIGS. 7A to 7D are diagrams for sequentially explaining the folding operation of the rear side flaps by the wrap round sheet folding apparatus.

  A container supply conveyor that supplies a plurality of containers as a group of containers, and a wrap round sheet supply conveyor that supplies the front flap of the wrap round sheet upright from a direction orthogonal to the downstream end of the container supply conveyor; A flight bar that pushes and places a container group on the bottom surface of the supplied wrap round sheet, and a wrap round sheet transport conveyor that receives and transports the container group pushed into the flight bar and the wrap round sheet are provided. . The transport conveyor includes a pair of transport chains attached to a pair of machine frames each having an adjustable interval, and a rear flap standing unit that is attached to the transport chains at a constant interval and abuts against the rear flap from behind. And rear side flap folding means for abutting and folding the rear side flaps connected to both sides of the rear flap via a folding line. Furthermore, when the wrap round sheet is supplied to the conveyor, it moves to the upstream side in the transport direction to fold the front side flap, and when the rear side flap is folded, it moves to the downstream side in the transport direction. Side guides that operate to avoid interference are provided. The rear side flap folding means and the side guides on both sides are attached to one machine frame, and the size of the wrap round sheet and container has changed. Since the switching can be easily performed by adjusting, the purpose of easily performing the switching operation at the time of sharing is achieved.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. The rear side flap bending apparatus according to this embodiment is provided in the wrap round caser shown in FIGS. 1 and 2, and a plurality of containers 4 (container group 4A) are mounted on the wrap round sheet 2 (see FIG. 3). It is a device for folding the rear side flap located on the rear side in the transport direction in the process of sequentially folding the front and rear flaps, the top surface, and the front and rear side flaps.

  First, the configuration of the entire wrap round caser will be described. In this wrap round caser, a container supply unit X for supplying a container group 4A in which a predetermined number of containers 4 are grouped is provided on the upstream side, and the accumulated container group 4A is placed on the bottom surface on the downstream side. The flap folding part Y which receives the wrap round sheet | seat 2 and folds each flap, a side flap, etc. sequentially is provided. And the wrap round sheet supply part which supplies the wrap round sheet | seat 2 from the orthogonal | vertical direction (upper part of FIG. 1) in the middle of the upstream container supply part X arrange | positioned in series and the downstream flap folding part Y Hereinafter, the sheet supply unit Z is provided.

  A plurality of containers 4 supplied as a container group 4A collected on the wrap round sheet 2 supplied from the sheet supply unit Z are placed in the container supply unit X, and the wrap round sheet 2 and the container 4 are also mounted. Are integrally fed into the flap folding portion Y. In the flap folding portion Y, while the wrap round sheet 2 and the container 4 are being conveyed, the flaps and side flaps of each portion are sequentially folded into a case shape, and a predetermined number of containers 4 are formed by the wrap round sheet 2. A packaged product is produced.

  In the container supply part X, a container supply conveyor 6 that conveys a plurality of containers 4 in a grouped state is disposed. The containers 4 packed by the wrap round sheet 2 are grouped into four container groups 4A each in six rows in an upstream grouping device (not shown), and on both sides of the transport surface 6a of the container supply conveyor 6 It is conveyed to the filling position F while being guided by a pair of both side guides 8 arranged.

  The flight bar 10 is installed from the downstream part of the container supply conveyor 6 to above the filling position F, and each of the 24 container groups 4A grouped as described above is positioned at a predetermined interval, and the container supply It moves at a speed faster than the traveling speed of the conveyor 6 to forcibly advance. This flight bar 10 has a pair of chains 14 on both sides that are hung around sprockets 12 arranged in the upper, lower, left, and right positions above the container conveyance path (portion between both side guides 8) of the container supply conveyor 6. Are mounted horizontally at a predetermined interval in a direction perpendicular to the conveying direction of the container supply conveyor 6.

  The flight bar 10 moves along the movement trajectory shown in FIG. 2 (same as the arrangement of the chain 14), moves upward on the upstream side, and then descends to convey it on the container supply conveyor 6. Is moved between the two container groups 4A, moved forward at a higher speed than the container group 4A conveyed by the container supply conveyor 6 and caught up with the rear end of the front container group 4A. Press to advance. The flight bar 10 pushes the container group 4A onto the wrap round sheet 2 described later, and integrally pushes the wrap round sheet 2 and the container 4 toward the flap folding portion Y, and then to the container 4 being conveyed. It rises to a height where it does not interfere and moves backward again.

  A wrap round sheet supply conveyor (hereinafter referred to as sheet supply) extends from the direction orthogonal to the downstream end of the container supply conveyor 6 (extends from the upper side in FIG. 1 to the downstream end of the container supply conveyor 6). (Referred to as a conveyor) is arranged (not shown). A sheet magazine 18 is disposed obliquely above the upstream side of the sheet supply conveyor, and a plurality of wrap round sheets 2 are accommodated in a stacked state. Further, the sheet supply unit Z is provided with a sheet take-out means described later.

  As shown in FIG. 3, the wrap round sheet 2 handled in this embodiment includes a bottom surface 2a and a rear surface (rear flap 2c) connected to one side (right side in FIG. 3) via a fold line 2b. A folding flap 2e connected to a side opposite to the bottom surface 2a of the rear flap 2c via a folding line 2d, and a front surface (front flap) connected to a side opposite to the one side of the bottom surface 2a via a folding line 2f. 2g) and a top surface 2i connected to a side opposite to the bottom surface 2a of the front flap 2g via a folding line 2h. Further, the bottom side flap 2p, the rear side flap 2q, and the front side flap connected to the both sides of the bottom surface 2a, the rear flap 2c, the front flap 2g, and the top surface 2i through fold lines 2j, 2k, 2m, and 2n, respectively. 2r and the top surface side flap 2s are provided. As shown in FIG. 2, the sheet magazine 18 is disposed at a low inclination on the upstream side, and is accommodated in the sheet magazine 18 so that the rear flap 2c side of the wrap round seat 2 faces the upstream side (right side in FIG. 2). Has been.

  A sheet take-out means (not shown) is provided between the upper sheet magazine 18 and the lower sheet supply conveyor. Although not shown in the figure, the sheet take-out means is lifted and lowered so that the lowermost sheet of the wrap round sheet 2 accommodated in the sheet magazine 18 is sucked, lowered and taken out, and delivered to the sheet supply conveyor. I have to. The wrap round sheet 2 is removed from the sheet magazine 18 by adsorbing and lowering the suction means of the sheet take-out means to the lower surface side of the bottom surface 2a of the wrap round sheet 2 accommodated in the sheet magazine 18 in a flat state as a whole. Take out. The sheet folding means is arranged in the movement path of the wrap round sheet 2 until the taken wrap round sheet 2 is delivered onto the sheet supply conveyor, and the front flap 2g of the wrap round sheet 2 is pulled down while being engaged with the folding means. As a result, the wrap round sheet 2 is folded at a fold line 2f between the bottom surface 2a and the front flap 2g so as to be in a substantially right angle state and delivered to the sheet supply conveyor.

  The wrap round sheet 2 bent in an L shape is supplied to the filling position F by the sheet supply conveyor. Above the filling position F, a top surface folding bar 19 is arranged in a direction orthogonal to the conveying direction of the wrap round sheet 2 on which the container group 4A is placed (see FIG. 7 described later). The front flap 2g and the top surface 2i in an upright state of the supplied wrap round seat 2 are located on the container supply unit X side with respect to the top surface folding bar 19 (see FIG. 7C). Moreover, the top surface folding bar 19 is positioned above the folding line 2h between the front flap 2g and the top surface 2i.

  The container group 4A conveyed by the container supply conveyor 6 is placed on the wrap round sheet 2 supplied from the sheet supply conveyor, and is delivered to the flap folding portion Y as it is. In the flap folding part Y, a wrap round sheet transport conveyor 20 (hereinafter referred to as a transport conveyor) that transports the wrap round sheet 2 and the container 4 together, and an upstream end of the transport conveyor 20 are arranged. An intermediate conveyor 22 (see FIGS. 5 and 6, not shown in FIG. 1) for delivering the wrap round sheet 2 and the container 4 sent from X to the transport conveyor 20 is disposed.

  In this embodiment, the transport conveyor 20, the intermediate conveyor 22, and the rear side flap folding device described later are arranged on both sides so that the wrap round caser can be used for lap round sheets 2 of various sizes. The interval between each member is adjustable. The flap folding part Y is disposed between the frames 24 on both sides, and each member is supported by a pair of machine frames 26 supported by the frames 24 on both sides so as to be movable in the lateral direction (direction perpendicular to the conveying direction). ing. Two nuts 30 and 32 are respectively screwed onto two horizontal screw shafts 27 and 28 in a direction orthogonal to the conveying direction, which are rotatably supported by the upstream and downstream portions between the frames 24 on both sides. ing. The upstream portion and the downstream portion of the machine frame main body 26a are fixed to the two nuts 30 and 32 on the upstream side and the downstream side, respectively. Both screw shafts 27 and 28 are threaded in opposite directions on both the left and right sides. By rotating these screw shafts 27 and 28, the nuts 30 and 32 on both sides are fixed to these nuts 30 and 32. The two machine casing main body portions 26a approach and separate from each other.

  A machine frame slide motor 34 is connected to a downstream screw shaft 28 (hereinafter referred to as a drive-side screw shaft), and the drive-side screw shaft 28 rotates forward and backward by driving the machine frame slide motor 34. The drive-side screw shaft 28 and the upstream-side screw shaft 27 (hereinafter referred to as a driven-side screw shaft) have bevel gears 28a and 27a attached to the end portions, and the bevel gears 27a and 28a of both the screw shafts 27 and 28 are attached to the bevel gears 27a and 28a. The bevel gears 36a and 36b fixed to both ends of the bevel gear shaft 36 are engaged with each other, and the rotation of the drive side screw shaft 28 is transmitted to the driven side screw shaft 27 via the bevel gear shaft 36, and both the screw shafts 28 and 27 are the same. It is designed to rotate at the same angle in the direction. Therefore, by rotating the drive-side screw shaft 28, the machine frames 26 on both sides are moved by the same amount in the separating direction or the approaching direction while maintaining the parallel state.

  Guide shafts 39 and 38 are fixed adjacent to the drive-side screw shaft 28 and the driven-side screw shaft 27, respectively. A slider fixed to the lower surface of the machine casing 26 is fitted to the guide shafts 38 and 39 to guide the machine casings 26 on both sides moving in the left-right direction.

  Extension portions 26b (see FIG. 5) are provided at the upstream ends of the main body portions 26a of the two machine frames 26, and each member described below is attached to the extension portions 26b. Therefore, by adjusting the interval of the machine frame 26, it is possible to adjust the interval by moving the pair of members on both sides in the width direction.

  The conveyor 20 includes a driven sprocket 40 (see FIGS. 4 to 6) disposed on both sides on the upstream side, a drive sprocket 42 (see FIG. 1) disposed on both sides on the downstream side, and these upstream and downstream sides. A pair of endless conveyance bodies (conveyance chains 44) are provided on both sides of the sprockets 40 and 42. The downstream drive sprocket 42 is connected to a horizontal drive shaft 46 penetrating between the frames 24 on both sides via a key so as to be movable in the axial direction, and rotates integrally with the drive shaft 46. It can be moved on the shaft 46. A conveyance conveyor drive motor 48 is connected to the drive shaft 46 and is rotated by the drive of the drive motor 48. Boxes 49 are arranged around the drive sprockets 42 on both sides so that they can rotate relative to the drive shaft 46. That is, the drive sprocket 42 can move in the axial direction with respect to the drive shaft 46 and rotates integrally, and the box 49 can move in the axial direction integrally with the drive sprocket 42 with respect to the drive shaft 46. The drive shaft 46 and the drive sprocket 42 can rotate relative to each other.

  A box 49 surrounding the drive sprocket 42 is connected to the end of the main body portion 26a of the machine frame 26 via a connection plate 51. When the machine frame 26 is moved in the width direction (direction perpendicular to the conveying direction), The box 49 and the drive sprocket 42 move along the drive shaft 46 as a unit with the machine frame 26. Further, the upstream driven sprocket 40 is rotatably supported by horizontal driven shafts 47 (see FIG. 5) attached to the machine frame extensions 26b on both sides, and moves the machine frame 26 in the width direction. These driven sprockets 42 are also moved together to adjust the distance between them.

  Rear flap erecting means (finger 50) that abuts on the rear flap 2c of the wrap round sheet 2 and raises the rear flap 2c is attached to the transport chains 44 on both sides of the transport conveyor 20 at predetermined intervals. These fingers 50 raise the rear flap 2c, and then press the rear flap 2c as it is to convey the wrap round sheet 2 on which the container group 4A is placed.

  The intermediate conveyor 22 is arranged inside the upstream ends of the two conveying chains 44 of the conveying conveyor 20 (see FIGS. 5 and 6). The intermediate conveyor 22 includes an upstream pulley 54 rotatably supported by a pair of horizontal support shafts 52 attached to the front ends of the extension portions 26b of the both-side machine casing 26 so as to face each other, and these upstream pulleys 54. A downstream pulley 58 that is rotatably supported by a pair of horizontal support shafts 56 (see FIG. 6) attached to the machine frame extension 26b slightly downstream of the downstream pulley 58, and slightly downstream of the downstream pulley 58. On the side, a pair of endless belts 64 wound around a drive pulley 62 connected to a drive shaft 60a of an intermediate conveyor drive servomotor 60 fixed to the machine frame extension 26b are provided.

  The upstream pulley 54 of the intermediate conveyor 22 is located slightly upstream of the driven sprocket 40 disposed on the upstream side of the transport conveyor 20, and the downstream pulley 58 of the intermediate conveyor 22 is positioned on the driven sprocket 40 of the transport conveyor 20. It is located slightly downstream. Further, the transport surface 22 a of the intermediate conveyor 22 is located slightly above the transport surface 20 a of the transport conveyor 20. The intermediate conveyors 22 on both sides are also attached to the machine frames 26 on both sides, and the interval is adjusted simultaneously by adjusting the interval between the machine frames 26.

  Rear side flap folding means 66 for folding the rear side flaps 2q provided on both sides of the rear flap 2c of the wrap round seat 2 are provided near the tip of the extension part 26b of the both-side machine frame 26, respectively. The rear side flap folding means 66 includes a contact member (tucker 68) that comes into contact with the rear side flap 2q of the wrap round seat 2 from behind, and a servo motor 70 as a tucker drive means for rotating each tucker 68. Yes. The tuckers 68 on both sides are attached to a drive shaft of a servo motor 70 for driving a tucker fixed to a frame portion 26c provided to extend outside the extension portion 26b of the machine frame 26 so as to face each other. By driving these servo motors 70, at a lower position (rotating in the direction shown in FIG. 5) that does not interfere with the wrap round sheet 2 conveyed upward, and at a speed faster than the speed of the wrap round sheet 2 being conveyed. It is reciprocally rotated between the folding position (position shown in FIG. 6) that moves in the transport direction. These rear side flap folding means 66 on both sides are also attached to the machine casings 26 on both sides, and the interval in the width direction can be adjusted by adjusting the interval between the machine casings 26. The two tuckers 68 bend the rear side flaps 2q connected to both sides of the rear flap 2c, and are outside a predetermined distance from the two fingers 50 attached to the two transport chains 44 of the transport conveyor 20. positioned.

  On both sides of the upper side of the conveyor 20, the front side flap 2 r of the wrap round sheet 2 conveyed with the container 4 placed on the bottom surface 2 a is folded back toward the rear side by interfering with the front side flap 2 r. A side guide 72 is provided to sandwich the rear side flap 2q that is pushed from behind and bent forward by both sides. As shown in FIG. 5, these side guides 72 on both sides move forward and backward along the conveyance direction of the wrap round sheet 2 and can also move in the width direction (direction perpendicular to the conveyance direction). The side guide 72 indicated by a solid line in FIG. 5 is a position that moves toward and away from the downstream side, and the side guide 72 indicated by an imaginary line is located at a position that moves toward and toward the upstream side. The front ends 72a of both side guides 72 are bent outward so that the front side flap 2r can be easily bent and the rear side flap 2q is easily sandwiched.

  A side guide drive motor 74 is fixed horizontally toward the downstream portion of the machine frame extension 26b and facing the outside of the machine frame 26, and a drive pulley 76 is attached to the drive shaft of the drive motor 74, and A driven pulley 78 is rotatably supported by the frame portion 26c. A side guide advance / retreat cylinder 84 is fixed to a belt 80 wound around the upstream driven pulley 78 and the downstream drive pulley 76 via an upright mounting member 82 (see FIG. 6). The side guide advance / retreat cylinders 84 on both sides are horizontally fixed in directions facing each other, and the side guides 72 are attached to the piston rods of both the advance / retreat cylinders 84. Both the side guides 72 are arranged at a height that can sandwich the front side and rear side side flaps 2r, 2q of the wrap round sheet 2 conveyed on the conveyor 20. Both side guides 72 move forward and backward in the conveying direction by reciprocating the belt 80 by driving the side guide drive motor 74, and approach and separate from each other by the operation of the side guide advance / retreat cylinder 84.

  These side guides 72 move forward and backward in the horizontal direction along the conveyance direction, and can approach and separate from each other. The position indicated by the imaginary line in FIG. 5 moves to the most upstream side, and , The closest position, and the position at the time when the conveyor 20 receives the container group 4 </ b> A and the wrap round sheet 2. Further, the position indicated by the solid line in the figure is the position that moves most downstream and is farthest away, and is the position when the rear side flap 2q is bent by the tucker 68. These side guides 72 are also attached to the extension part 26b of the machine frame 26. When the machine frame 26 is moved in the width direction in order to adjust the interval of the transport conveyor 20, the side guides 72 are also integrally spaced. Adjusted.

  A fixed guide 86 is disposed slightly below the side guide 72 (see FIG. 6). When the wrap round sheet 2 is conveyed by the conveying conveyor 20, the fixed guides 86 on both sides are directed forward by the front side flap 2 r bent by the side guide 72 advanced forward and the tucker 68. The bent rear side flap 2q is sandwiched and held. Both of these fixed guides 86 are also fixed to the machine frame 26. When the machine frame 26 is moved for adjusting the interval of the transport conveyor 20, the interval is adjusted simultaneously. In FIG. 5, the fixed guide 86 is not shown.

  The operation of the wrap round caser provided with the rear flap bending apparatus according to the above configuration will be described. In the container supply part X, the container supply conveyor 6 which carries the container 4 and conveys it, and the container 4 conveyed by this container supply conveyor 6 is pressed from back, and it advances at a faster speed than the container supply conveyor 6. A flight bar 10 is provided. A plurality of containers 4 are grouped and conveyed by a container supply conveyor 6 as a group of containers 4A (in this embodiment, 24 containers of four in each of six rows). A flight bar 10 is provided above the downstream portion of the container supply conveyor 6, and the container group 4 </ b> A is moved faster than the conveyance speed of the container supply conveyor 6 by engaging and moving behind the container groups 4 </ b> A. Advance at high speed.

  A sheet supply conveyor (not shown) for supplying the wrap round sheet 2 from the orthogonal direction is disposed at the downstream end of the container supply conveyor 6, and the wrap round sheet 2 stacked and accommodated in the sheet magazine 18 is provided. The sheet is taken out by a sheet take-out means (not shown) and conveyed to the filling position F by this sheet supply conveyor. A folding guide (not shown) is arranged in a path for taking out the wrap round sheet 2 from the sheet magazine 18 and delivering it to the sheet supply conveyor 6, and the wrap round sheet 2 having the bottom surface 2a adsorbed by the adsorbing means of the sheet taking out means is drawn out. In the process of being handed over to the sheet supply conveyor, the front flap 2g is pressed against the folding guide and is bent at a folding line 2f between the bottom surface 2a and the front flap 2g. The wrap round sheet 2 is in a state where the bottom surface 2a and the rear flap 2c are horizontal, and the front surface flap 2g and the top surface 2i are upright and face the front side in the conveying direction (left side in FIGS. 1 and 2). It is delivered to the sheet supply conveyor and sent to the filling position F. The top surface folding bar 19 is arranged at the filling position F, and the top surface 2i of the wrap round sheet 2 is located on the container supply conveyor 6 side of the top surface folding bar 19 (see FIG. 7C). Refer to the wrap round sheet 2 shown).

  On the bottom surface 2a of the wrap round sheet 2 supplied to the filling position F, the container group 4A pushed by the flight bar 10 is pushed and placed. The flight bar 10 is moved horizontally to the most advanced portion of the container supply conveyor 6, and after the container group 4 </ b> A is placed on the bottom surface 2 a of the wrap round sheet 2, the flight bar 10 moves forward as it is, and the wrap round sheet 2 and the container 4 are integrally pushed out to the flap folding part Y side. At this time, the front flap 2g of the wrap round sheet 2 is pushed from behind by the container 4, and the top surface 2i connected to the upper side of the front flap 2g is pressed by the top surface folding bar 19, so The top surface 2i is bent backward from the fold line 2h (see FIG. 7A).

  In the flap folding portion Y, the shortest intermediate conveyor 22 on the most upstream side is arranged at a position slightly higher than the transport conveyor 20, and the wrap round sheet 2 and the container group 4A pushed out from the container supply section X are: Once placed on the intermediate conveyor 22, it is transported and immediately delivered to the transport conveyor 20.

  When the wrap round sheet 2 and the container group 4A are pushed out from the container supply part X to the flap folding part Y, the side guides 72 on both sides move to the most upstream side, as indicated by the imaginary line in FIG. And it is in a close position (refer to the side guide shown in phantom lines in FIG. 7A and FIG. 5). At this time, both side guides 72 are located slightly outside the folding line 2m between the front flap 2g of the wrap round seat 2 and the front side flaps 2r on both sides thereof. When the wrap round seat 2 is pushed between the both side guides 72 in this state, the leading ends 72a of the both side guides 72 abut against the front side flaps 2r on both sides, and the front side flaps 2r are moved along with the movement of the wrap round seats 2. Bend toward the back in the transport direction.

  Both side guides 72 have a front side flap 2r bent toward the rear (upstream side) at a folding line 2m, and are faster than the forward speed of the wrap round seat 2 with respect to the wrap round seat 2 moving forward. While moving downstream at a speed (see FIGS. 7B and 7C), it is separated by a predetermined amount to receive the rear side flap 2q that is folded thereafter (see the side guide 72 indicated by a solid line in FIG. 5).

  When the rear flap 2c in a horizontal state located on the rear side of the wrap round sheet 2 approaches the driven sprocket 40 on the upstream side of the transport conveyor 20, the fingers 50 attached to the transport conveyor 20 are While rotating around the driven sprocket 40 and moving above the conveying surface 20a, it gradually abuts against the lower surface side of the rear flap 2c (see FIG. 7B). In this way, while the rear flap 2c is erected by the finger 50, the tucker 68 is rotated by driving the servo motor 70 for driving the tucker. The tucker 68 rotates in the same rotational direction as the finger 50 at a speed faster than the moving speed of the finger 50, and a rear side flap 2q connected to both sides of the rear flap 2c via a fold line 2k. Bend toward the side of 4A.

  The rear side flaps 2q on both sides bent forward are sandwiched between the side guides 72 on both sides that have moved and separated from each other (see FIG. 7C). The front side flap 2r that has already been bent, and the rear side flap 2q that has been bent at this time and pressed by the side guide 72, advances as it is and enters between the fixed guides on both sides (see FIG. 7D). . Further, the side guide 72 that has once depressed the rear side flap 2q narrows the distance between the two and moves upstream (position indicated by an imaginary line in FIG. 5) and waits for the next wrap round sheet 2 to be supplied.

  The front and rear flaps 2g and 2c are erected, and the front and rear side flaps 2r and 2q connected to both sides of the flaps 2g and 2c are folded to the side surface of the container group 4A. The top surface 2i and the like are bent by a bending means (not shown), and the container 4 is molded as a case.

  When the size of the wrap round sheet 2 folded by the wrap round caser and the number of containers 4 are changed and it is necessary to adjust the distance between the two transport chains 44 of the transport conveyor 20, the machine frame slide motor 34 The drive side screw shaft 28 is rotated by driving. Due to the rotation of the drive side screw shaft 28, the nuts 32 on both sides move by the same amount in the opposite direction along the drive side screw shaft 28. The rotation of the drive side screw shaft 28 is transmitted to the driven side screw shaft 27 via the bevel gear shaft 36, and both nuts 30 of the driven side screw shaft 27 move in the axial direction by the same amount as the nut 32. As a result, the entire machine casing 26 moves in the opposite direction while maintaining a parallel state and approaches or separates.

  Both transport chains 44 of the transport conveyor 20 are respectively connected to the machine frames 26 on both sides, and when the distance between the machine frames 26 is adjusted by moving the machine frame 26 in the width direction, the distance between the both transport chains 44 is also adjusted. The fingers 50 that erect the rear flap 2c of the wrap round sheet 2 are attached to both the transport chains 44, and the distance between the fingers 50 is adjusted at the same time as the distance between the both transport chains 44 is adjusted. Furthermore, both the intermediate conveyors 22 are also attached to the extension portions 26 c of the two machine frames 26, and the distance between the two conveyor chains 44 is adjusted by adjusting the distance between the machine frames 26. Further, the rear side flap bending means 66 for bending the rear side flap 2q connected to both sides of the rear flap 2c of the wrap round seat 2 are respectively attached to the frame portions 26c provided on the extension portions 26b of the both-side machine frame 26. The distance between the rear side flap folding means 66 is also adjusted in accordance with the distance between the conveying chains 44. As described above, when the size of the wrap round sheet 2 is changed and the distance between both the transport chains 44 of the transport conveyor 20 is adjusted, if the distance between the machine frames 26 is adjusted, the transport needs to be adjusted in addition to the above. The intervals between the members other than the conveyor 20 (intermediate conveyor 22, rear side flap folding means 66, etc.) are also automatically adjusted. Therefore, it can be easily used for articles such as wrap round sheets 2 of various sizes and containers 4 to be packaged, and can be adjusted by a simple operation. In the above-described embodiment, the drive screw shaft 28 for moving the machine frame 26 is rotated by the machine frame slide motor 34. However, the drive screw shaft 28 may be manually rotated.

  Note that the holding time of the rear side flap 2q by the tucker 68 can be changed according to the length of the rear side flap 2q to be processed. That is, it takes time for the short rear side flap 2q to return to the position guided by the side guide 72, compared to the long rear side flap 2q. Accordingly, if the holding time is the same as that of the long rear side flap 2q, the holding of the rear side flap 2q is released before the side guide 72 returns, and the rear side flap 2q interferes with the side guide 72 and moves in the reverse direction. This may cause problems such as breaking. Therefore, in the case of the short rear side flap 2q, this problem can be solved by increasing the holding time by the tucker 68. Moreover, in the said Example, although the back flap standing means (finger 50) and the tucker 68 of the back side flap bending means 66 are made into a separate member, it can also be set as an integral structure. For example, the tucker rotated by the servo motor 70 is L-shaped, and a portion parallel to the conveying direction of the L-shaped tucker is connected to the drive shaft of the servo motor 70 to bend the rear side flap 2q and the parallel. It is also possible to provide a portion orthogonal to the conveying direction at the rear end of such a portion and bring this portion up against the rear flap 2c.

Z sheet supply unit (wrap round sheet supply means)
2 wrap round sheet 2a bottom surface 2c rear flap 2g front flap 2k fold line 2q rear side flap 4A container group 20 wrap round sheet transport conveyor (transport conveyor)
26 Machine frame 44 Endless carrier (conveyance chain)
50 Rear flap standing means (finger)
66 Back side flap folding means 68 Contact member (tucker)
70 Drive means (servo motor)

Claims (3)

A wrap round sheet supply means for supplying a wrap round sheet for wrapping a container group placed on the bottom surface in a state where the front flap is raised, and at least a pair of endless members provided on a pair of machine frames capable of adjusting the interval. A wrap round sheet conveying conveyor that receives the wrap round sheet and conveys it downstream, a rear flap standing means that abuts against a rear flap of the wrap round sheet, and both sides of the rear flap A rear side flap bending means for abutting and bending the rear side flap connected via a folding line;
The rear side flap folding means includes a contact member that is rotatably supported by the machine frame with a horizontal axis as a fulcrum, and a drive means that rotates the contact member.
A rear side flap bending apparatus, wherein the rear side flap is bent during the standing operation by the rear flap standing means.   The drive means for rotating the contact member is a servo motor, and the time during which the contact member is in contact with the rear side flap and bent can be adjusted according to the type of wrap round sheet to be processed. The rear side flap bending apparatus according to claim 1, wherein In the machine frame, side guides on both sides are provided so as to be movable in the conveying direction of the wrap round sheet and to be close to and separated from both sides of the wrap round sheet
When the wrap round sheet is sent to the wrap round sheet transport conveyor, the side guide is moved in the direction opposite to the transport direction so that the front side flap is connected to both sides of the front flap via a fold line. The interference with the rear side flap is avoided by moving the side guide in the conveying direction and separating the side guide during the folding operation of the rear side flap. Rear side flap bending device.