JP3750110B2 - Box closing machine lid closing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a lid closing device for a box filling machine that inserts an insertion piece connected to a lid panel of a box filled with articles and closes the lid.
[0002]
[Prior art]
A lid panel for closing the opening of the body portion is connected to an edge on the opening side of the body portion of the box made by folding each panel or flap of the developed sheet material. For example, as disclosed in Japanese Patent Publication No. 7-108559, a lid closing device that closes a lid panel by inserting a plug piece continuously provided at the leading edge of the lid panel into the opening. is there. In this device, when lifting the top plate (lid panel) while sucked and held by a suction cup, the insertion piece is bent from the crease line between the top plate and the insertion piece by a guide, and then the top plate is lowered. When inserting, it is comprised so that an insertion piece may be inserted in the opening part of a trunk | drum along a guide.
[0003]
[Problems to be solved by the invention]
According to the above method, if the sheet material that is a material of the box is made of thin cardboard or the like, the insertion piece can be favorably folded from the crease line when the top plate is lifted. However, when a relatively corrugated material such as thin cardboard is used as the sheet material, not only can the insert piece bend reliably, but also when the top plate is held and lifted by a suction cup. In other words, the holding is released due to the bending resistance of the insertion piece, and problems such as the inability to perform good lid closing work are pointed out. In addition, the top plate is in an unsupported state after the insertion piece is inserted into the body, and when the suction cup is retracted upward after insertion, the top plate is lifted by residual air pressure or the box is moved downstream. There is a risk that the plug will come out of the body in the process of being transferred to the side.
[0004]
OBJECT OF THE INVENTION
In view of the problems inherent in the above-described conventional technology, the present invention has been proposed to suitably solve this problem, and the insertion piece of the lid panel is securely inserted into the opening of the trunk portion. It is an object of the present invention to provide a lid closing device for a box filling machine that can be delivered downstream.
[0005]
[Means for Solving the Problems]
In order to overcome the above-mentioned problems and achieve the desired purpose suitably, the lid closing device of the boxing machine according to the present invention is:
Insert the insertion piece that is connected to the end edge of the lid panel that is connected to the edge on the opening side of the box body portion via the crease line into the opening portion of the body portion. A lid closing device for a packaging machine that performs lid closing,
Auxiliary folding means for folding the insertion piece from the crease line with the lid panel and attaching a crease;
Suction holding means for sucking and holding the lid panel and rotating in the opening and closing direction of the lid panel based on a crease line with the body portion;
When the lid panel is lifted by the suction holding means, it rotates, abuts against the insertion piece, guides bending based on a crease line with the lid panel, and when the lid panel is lifted to a predetermined position. A guide member configured to support the tip of the insertion piece so that the tip of the insertion piece is positioned inside the opening of the trunk, and to insert and guide the insertion piece into the trunk,
When the guide member rotates in the direction of guiding the insertion piece, the lid panel is allowed to open and close, and the guide member rotates in the opposite direction. The pressing member is configured to push the lid panel in the closing direction and is configured to hold the lid panel so that the insertion piece does not come out from the inside of the box body that is transferred downstream after the lid is closed. It is characterized by that.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, the lid closing device of the boxing machine according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. For convenience of explanation, front and rear correspond to the transport direction of the box, the downstream side is designated as front, the upstream side is designated as rear, and the direction horizontally intersecting the transport direction is designated as left and right when viewed from the downstream side. Shall.
[0007]
As shown in FIG. 1, the boxing machine which employ | adopted the lid closing apparatus based on an Example is provided with the transfer conveyor 12 which transfers the box 10 with which the articles | goods were filled. As shown in FIG. 3, the transfer conveyor 12 includes a pair of endless chains 14 and 14 that are spaced apart in the left-right direction, and a pair of support members that are spaced apart from each other in the running direction and that are arranged at predetermined intervals on each chain 14. 16 and 17 and a bed 18 disposed horizontally above the upper traveling path in the chains 14 and 14. Then, the box 10 placed on the bed 18 between the pair of front and rear support members 16 and 17 protruding upward from the bed 18 is supported by a pair of support members 17 and 17 located on the rear side, which will be described later. The auxiliary bending position where the bending device 20 is disposed and the lid closing position where the insertion device 22 is disposed are horizontally transferred to be stopped and positioned. In the embodiment, the auxiliary folding device 20 and the insertion device 22 constitute a lid closing device 24. In the embodiment, the transfer conveyor 12 is intermittently driven and controlled so that the two front and rear boxes 10 and 10 can be positioned as a set at the auxiliary folding position and the lid closing position, respectively.
[0008]
The box 10 transferred by the transfer conveyor 12 is formed by bending a barrel portion 10a into a cylindrical shape from a spread sheet developed in a sheet shape, and the barrel portion 10a faces an opening upward. A posture in which the lid panel 10b is placed on the bed 18 and extends substantially vertically upwardly through the _first fold line K1 to the front end edge on the upper opening side of the trunk portion 10a. Thus, the box 10 is configured to be transferred toward the downstream auxiliary folding position (see FIG. 1). Moreover, the insertion piece 10c inserted in the opening part of the trunk | drum 10a is continuously provided in the front-end edge of the cover panel 10b via the _2nd crease line K2. In this embodiment, the side flaps connected to the side panel of the body portion 10a are bent by approximately 90 °, respectively, and each side connected to the left and right edges of the bottom panel and the cover panel 10b is provided. In a state where the part flaps 10d and 10d are not bent, the box 10 filled with the article is transferred to the downstream side.
[0009]
Above the bed 18, as shown in FIG. 1, an upper bending guide 26 that extends in a longitudinal direction in a posture parallel to the bed 18 is a height dimension of the trunk portion 10 a in the box 10. It arrange | positions so that it may oppose with a slightly wider space | interval. And the lid panel 10b extended upward from the trunk | drum 10a of the box 10 transferred with the said transfer conveyor 12 contact | abuts from the back side to the upward inclination part formed in the rear end of the upper bending guide 26. FIG. in, as shown in FIG. 4, and is substantially horizontal posture so as to cover the upper opening portion of the first at fold lines K ₁ is bent rearward barrel 10a. In this state, the insertion piece 10c connected to the lid panel 10b is set to extend substantially horizontally rearward from the rear end edge of the body portion 10a.
[0010]
In the area where the guide 26 is disposed downstream of the rear end of the upper bending guide 26, an insertion piece 10c extending substantially horizontally behind the barrel 10a is provided on the rear surface of the barrel 10a. The auxiliary bending device 20 provided with an auxiliary bending member (auxiliary bending means) 28 that bends along is arranged. The auxiliary bending device 20 includes an operating member 30 that extends in the left-right direction above the upper bending guide 26 by a predetermined length and is moved up and down by a driving means (not shown). As shown in FIG. 2, the operating member 30 is provided with holding members 32 that are spaced apart on both the left and right sides sandwiching the upper bending guide 26 and extend in the front-rear direction by a predetermined length. Auxiliary bending members 28, 28 that hang down at a predetermined length are disposed at both front and rear ends of 32. The auxiliary folding members 28, 28 move up and down the operating member 30, so that the lower end of the auxiliary folding members 28, 28 is positioned above the upper folding guide 26 (see FIG. 4A) and the transfer conveyor 12. It is configured to vertically move up and down between a bending position (see FIG. 4B) below the upper end of the body portion of the box 10 to be transferred. Further, as shown in FIG. 1, the pair of auxiliary bending members 28, 28 disposed before and after each holding member 32 is a body portion of the box 10, 10 that is positioned at the auxiliary bending position and is separated from the front and rear. 10a and 10a are set so as to be located slightly behind the rear surface. That is, the auxiliary folding members 28 and 28 are lowered from the standby position to the folding position with respect to the two front and rear boxes 10 and 10 which are transferred to the auxiliary folding position by the transfer conveyor 12 and stopped and positioned. From the second crease lines K ₂ and K ₂ with the lid panels 10b and 10b, the insertion pieces 10c and 10c extending horizontally rearward from the trunk portions 10a and 10a are arranged along the trunk portions 10a and 10a. It is configured to bend and crease.
[0011]
On the downstream side of the front end of the upper folding guide 26 (position where the auxiliary folding device 20 is disposed), the insertion piece 10c, which has been folded by the auxiliary folding member 28, is placed in the upper opening of the trunk portion 10a. Two insertion devices 22 each having an adsorption member (adsorption holding means) 34 and a folding member 36 to be inserted into the front and rear are spaced apart from each other. Since the configuration of the front and rear insertion devices 22 and 22 is the same, the configuration of one insertion device 22 will be described, and the same members of the other insertion device 22 are only given the same reference numerals.
[0012]
As shown in FIGS. 2 and 3, the insertion device 22 is pivotally supported by a pair of side plates 38, 38 that are spaced apart from each other across the transfer conveyor 12 so that the shaft centers are aligned and can be rotated. A rotation arm 42 is provided on a shaft portion that includes the moving shafts 40 and 40 and projects to the inside of the side plate of each first rotation shaft 40 so as to be integrally rotatable. A pair of rotating arms 42, 42 facing left and right is provided with an attachment shaft 44 between ends spaced from the position where the first rotating shafts 40, 40 are disposed. The mounting shaft 44 is configured to rotate in a predetermined angle range in the forward and reverse directions with the first rotation shafts 40 and 40 as fulcrums by swinging the first swing lever 46 connected to the drive shaft by a driving means (not shown). Is done.
[0013]
As shown in FIG. 3, a pair of holders 48, 48 are disposed on the mounting shaft 44 so as to be separated from each other in the axial direction, and the adsorbing member 34 is sucked to the end portion extending rearward of each holder 48. Each of the suction members 34 is arranged in a fixed posture with respect to the mounting shaft 44, with the mouths facing downward, and the first crease line K ₁ with the barrel portion 10 a is used as a reference along with the mounting shaft 44. The lid panel 10b is configured to rotate in the opening / closing direction. Further, the suction member 34 is configured to be connected to a suction source (not shown) such as a blower or a vacuum generator so as to form a negative pressure therein. As the mounting shaft 44 rotates, the adsorbing member 34 has a standby position that is spaced upward from the lid panel 10b that covers the upper opening in the body 10a of the box 10, and an upper surface (outer surface) of the lid panel 10b. The lid panel 10b can be sucked and held by the negative pressure generated inside at the operating position. Then, by the suction member 34 to the standby position in this state it is rotated, configured to open lifting the lid panel 10b the first folding lines K ₁ of the trunk portion 10a as an opening and closing fulcrum. As shown in FIG. 5, the axis of the first rotation shafts 40, 40, that is, the rotation fulcrum of the adsorption member 34, opens and closes the lid panel 10b with respect to the trunk portion 10a of the box 10 positioned at the lid closing position. It is set so as to coincide with the fulcrum (first crease line K ₁ ), and when the lid panel 10b is opened and closed with the suction member 34 being sucked and held, the suction portion of the lid panel 10b is not displaced and twisted. It is like that. Further, the lifting amount of the lid panel 10b is such that when the panel 10b is lifted, the tip of the insertion piece 10c that has been creased is above the upper end of the body 10a as shown in FIG. 5 (b). It is most preferable that it is set so as to face, but if it can be bent and guided to the position where the leading end of the insertion piece 10c faces the inside of the upper opening of the trunk portion 10a by a folding member 36, which will be described later, it is inserted. It may be a lifting amount at which the tip of the piece 10c faces downward from the upper end of the trunk portion 10a. The direction in which the lid panel 10b is lifted is not limited to the upper side as in the embodiment, and may be any direction as long as the insertion piece 10c is separated from the trunk portion 10a. For example, the trunk portion 10a is closed. When the opening is directed downward or laterally, the lifting direction is downward or lateral.
[0014]
As shown in FIG. 2, the space between the side plates 38 and 38 behind the position where the first rotary shafts 40 and 40 are disposed is above the box 10 positioned at the lid closing position and spaced apart from the rear. The second rotating shaft 50 constituting the insertion device 22 is pivotally supported in a posture parallel to the first rotating shafts 40, 40, and the second rotating shaft 50 is a driving means (not shown). As the second rocking lever 52 coupled to the rocking member is pivoted in the predetermined range of angles in the forward and reverse directions. In addition, a folding member 36 having a substantially U-shaped planar shape is disposed on the second rotation shaft 50 via a mounting jig 54 so as to be integrally rotatable at a presser position to be described later. The pair of pressing members 36a, 36a as a pair of pressing members extending in the radial direction from the second rotating shaft 50 of the folding member 36 are a pair of pressing members 36a and 36a disposed on the mounting shaft 44 as shown in FIG. The suction members 34, 34 are spaced apart on both sides of the suction member 34, and the front end thereof is set to a position capable of contacting the upper surface of the closed lid panel 10b in the box 10 positioned at the lid closed position. It should be noted that the distal end of the presser piece 36a at the presser position may be set to an appropriate position within a range in which the insertion piece 10c does not come out of the body part 10a after the lid is closed. Then, the folding member 36 rotates the second rotation shaft 50 to prevent the cover panel 10b from being lifted from the body portion 10a of the box 10 by the holding pieces 36a and 36a and the insertion piece 10c from coming out. It is comprised so that it may rotate between a position and the folding position used as the substantially perpendicular | vertical attitude | position which the front-end | tip of this presser piece 36a, 36a orients upwards.
[0015]
The folding piece 36b serving as a guide member extending from the second rotating shaft 50 in the folding member 36 in the direction opposite to the extending direction of the pressing pieces 36a, 36a is located on the upper side in the pressing position shown in FIG. When the folding member 36 is turned to the folding position, the folded portion faces the inner side of the upper opening in the vicinity of the upper end of the trunk portion 10a in the box 10 positioned at the lid closing position. Is set. When the lid panel 10b sucked and held by the suction members 34, 34 is lifted, the insertion piece 10c is folded by the folding piece 36b in the folding direction close to the lower surface (inner surface) side of the lid panel 10b. When the lid panel 10b is closed while being guided by bending, the outer surface of the insertion piece 10c is brought into contact with the bent portion of the insertion piece 36b and close to the body portion 10a, so that the insertion portion 10c is inserted. The piece 10c is configured to be inserted and guided into the upper opening of the body 10a. In addition, with the folding member 36 facing the pressing position, the front end of the folding piece 36b (the rear end of the folding member 36) is located at the upper part close to the front end of the upper folding guide 26, and the upper folding guide The lid 10 of the box 10 away from the front end of the box 26 is allowed to be lifted upward from the trunk portion 10a while allowing the box 10 to be introduced into the lid closing position. That is, the relationship between the holding piece 36a and the folding piece 36b of the folding member 36 is that the folding member 36 rotates from the holding position (the folding piece 36b rotates in the direction of guiding the insertion piece 10c) to the folding position. Accordingly, the presser piece 36a allows the lid panel 10b to be opened and closed, and the folding piece 36b guides the insertion piece 10c, and the folding member 36 rotates from the folding position (the folding piece 36b is opposite). And the presser piece 36a pushes the lid panel 10b in the closing direction, and is inserted from the body 10a of the box 10 which is transferred downstream after the lid is closed. The lid panel 10b is held so that the piece 10c does not come out, and the folding piece 26b is set to allow introduction of the box 10 to the lid closed position.
[0016]
The left-right width dimension of the folding piece 36b is set to be substantially the same as the left-right width dimension of the insertion piece 10c, so that the entire insertion piece 10c can be reliably inserted and guided into the body portion. The folding member 36 rotates from the presser position to the folding position at a timing before the suction member 34 rotates from the operating position to the standby position, and the suction member 34 rotates from the standby position to the operating position. Then, the insertion piece 10c is set so as to rotate from the folding position toward the pressing position at a timing after the tip of the insertion piece 10c is inserted into the upper opening of the trunk portion 10a.
[0017]
As shown in FIG. 2, the front and rear first rotating shafts 40 and 40 and the second rotating shafts 50 and 50 are connected by connecting members 56 and 58, respectively. As the swing lever 52 swings, the suction members 34 and 34 and the folding members 36 and 36 of the front and rear insertion devices 22 and 22 are configured to rotate integrally.
[0018]
[Effect of the embodiment]
Next, the operation of the lid closing device of the boxing machine according to the embodiment configured as described above will be described. In the embodiment, the lid closing operation of the two boxes 10 and 10 before and after being transferred by the transfer conveyor 12 is performed at the same time, but only the operation relating to one box 10 will be described here.
[0019]
As shown in FIG. 1, the box 10 in which the articles are housed extends on the bed 18 facing the support members 16 and 17 before and after the transfer conveyor 12, and the lid panel 10 b extends substantially vertically from the trunk portion 10 a. In a state of being placed in a protruding posture, it is transferred toward the auxiliary folding position by the rear support members 17 and 17. When the box 10 passes between the bed 18 and the upper folding guide 26, as shown in FIG. 4A, the first fold line is formed so that the lid panel 10b of the box 10 covers the upper opening. While being bent rearward at K ₁ , the panel 10 b is transferred to the downstream side while being held by the upper bending guide 26.
[0020]
When the box 10 transported by the support members 17 and 17 arrives at the auxiliary folding position, as shown in FIG. 4B, the transfer conveyor 12 is stopped and the auxiliary folding member of the auxiliary folding device 20 is stopped. 28 moves up and down between the standby position and the folding position. The insertion piece 10c extending rearward from the body portion 10a of the box 10 positioned at the auxiliary folding position is the second folding when the auxiliary folding member 28 is lowered from the standby position to the folding position. folded so along the barrel 10a in Looking K ₂ Orikuse is awarded.
[0021]
When the auxiliary bending member 28 rises to the standby position, the transfer of the box 10 is resumed by the transfer conveyor 12, and the box 10 is transferred to the lid closing position and stopped and positioned. At this time, the lid panel 10b of the box 10 away from the front end of the upper folding guide 26 is introduced into the lid closing position in a state where the upward lifting is restricted by the folding member 36 facing the pressing position. Further, the suction members 34 and 34 are rotated from the standby position toward the operation position, and a suction source (not shown) and the suction members 34 and 34 are communicated with each other to apply a suction action to the suction members 34 and 34. Then, when the opening surfaces of the suction members 34 and 34 come into contact with the lid panel 10b, negative pressure is generated in the suction members 34 and 34, and the lid panel 10b is sucked and held (see FIG. 5A). . When the box 10 arrives at the lid closing position, the folding member 36 faces the pressing position, so that the lid panel 10b is restricted from being lifted from the trunk portion 10a.
[0022]
Next, when the folding member 36 is rotated from the pressing position toward the folding position, the pressing pieces 36a and 36a are separated upward from the lid panel 10b, and the panel 10b can be opened. . Further, when the suction members 34, 34 are rotated from the operating position toward the standby position at slightly different timings, the lid panel 10b held by suction is moved to the first position as shown in FIG. 5B. lifted the fold lines K ₁ as a fulcrum (is opened). In this case, the insertion piece 10c, the folding is positioned folded face in which the folding piece 36b of the folding member 36 in the bending direction at contact with the second folding lines K ₂ bending guide, the tip of the The posture is to face the inside of the upper opening above the trunk portion 10a. Since the insert piece 10c is preliminarily provided with a signature, the insert piece 10c can be easily used even when a sheet material having a relatively low waist such as a thin cardboard material is used as the material of the box 10. In addition, since the large resistance is not applied at the time of the bending, it is possible to prevent the suction and holding by the suction members 34 and 34 from being released.
[0023]
With the folding member 36 held in the folding position, the suction members 34 and 34 are rotated from the standby position toward the operating position, so that the lid panel 10b is in the first position as shown in FIG. the fold lines K ₁ while being closed as a fulcrum of the insertion piece 10c is plugged onto the opening of the body portion 10a while being guided by the folding piece 36b. Further, at the timing after the tip of the insertion piece 10c is inserted into the upper opening, the folding member 36 is rotated so as to reach the pressing position, thereby closing the upper opening of the body 10a. The lid panel 10b is pressed in the closing direction by the pressing pieces 36a, 36a. Then, after the negative pressure acting on the suction members 34, 34 is released, the suction members 34, 34 rotate from the operating position toward the standby position, and wait for the next box 10 to arrive. At this time, since the lid panel 10b is held by the holding pieces 36a and 36a, even when the residual pressure of the air is generated in the suction members 34 and 34, the suction is released, and the lid panel 10b is surely pulled away. The panel 10b is lifted by the adsorbing members 34, 34, so that the insertion piece 10c is prevented from coming out of the body portion 10a. In addition, since it is not necessary to wait for the residual pressure of air to disappear, cycle time can be shortened, and high-speed packaging can be achieved. Furthermore, since the rotation fulcrum of the adsorption members 34 and 34 coincides with the opening and closing fulcrum of the lid panel 10b, the adsorption site with the lid panel 10b is displaced when the lid panel 10b is opened and closed by the adsorption members 34 and 34. No load is applied to the lid panel 10b and the suction members 34, 34, and the suction holding state is stably maintained.
[0024]
After the suction members 34, 34 are turned to the standby position, the transfer of the box 10 by the transfer conveyor 12 is resumed, and the box 10 that has finished closing the lid of the lid panel 10b is held by the holding pieces 36a, The panel 10b is transferred to the downstream side while being held in the closed position by 36a. That is, the box 10 can be sent to the next process while the lid 10 is kept closed with the insertion piece 10c of the lid panel 10b inserted into the body 10a.
[0025]
[Example of change]
In the embodiment, two auxiliary folding devices (auxiliary folding means) and insertion devices (adsorption holding means, guide members, pressing members) are spaced apart from each other so as to simultaneously close the lids of the two boxes. As described above, one or three or more auxiliary folding devices or insertion devices may be arranged to close one or more boxes. In the embodiment, the presser piece (pressing member) and the folding piece (guide member) are formed as a single body. However, separate members can be connected by a connecting member so as to rotate integrally. Further, in the embodiment, the case where the lid of the box with the opening portion facing upward is described as being closed, but the opening with respect to the box with the opening portion closed by the lid panel facing downward or sideward is described. It is possible to employ a configuration in which an auxiliary folding device or an insertion device is disposed on the side of the part to close the lid. Further, the auxiliary bending means for attaching the signature to the insertion piece of the box in advance is not limited to one that moves up and down as in the embodiment, and it is also possible to bend the insertion piece by turning. .
[0026]
【The invention's effect】
As described above, according to the lid closing device of the boxing machine according to the first aspect of the present invention, even when a sheet material with a waist is used as the material of the box, the insertion piece is preliminarily attached with a fold. The insertion piece can be inserted well into the opening of the body portion to securely close the lid. Further, since the closed lid panel can be held by the pressing member, the box can be transferred to the downstream side in a good lid closed state.
[0027]
According to the lid closing device of the second aspect, since the rotation fulcrum of the suction holding means that opens and closes the lid panel by suction is made coincident with the opening and closing fulcrum with respect to the body of the lid panel, An unreasonable force is not applied to the part, and the opening and closing can be reliably performed with the holding state kept constant.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of a boxing machine employing a lid closing device according to an embodiment.
FIG. 2 is a plan view showing a schematic configuration of the boxing machine according to the embodiment.
FIG. 3 is a rear view of the insertion device of the lid closing device according to the embodiment when viewed from the upstream side.
FIG. 4 is a process diagram showing an operation process of the auxiliary folding device of the lid closing device according to the embodiment.
FIG. 5 is a process diagram showing an operation process of the insertion device according to the embodiment.
[Explanation of symbols]
10 Box 10a Body 10b Lid panel 10c Insert piece 28 Auxiliary folding member (auxiliary folding means)
34 Adsorption member (adsorption holding means)
36a Presser piece (pressing member)
36b Folding piece (guide member)
K ₁ first crease line K ₂ second crease line

Claims (2)

The lid (10b) connected to the edge on the opening side of the body (10a) of the box (10) via the crease line (K ₁ ) is connected via the crease line (K ₂ ). A lid closing device for a boxing machine that inserts the inserted piece (10c) into the opening of the body (10a) to close the lid,
The insertion piece and bent from fold line (K ₂₎ and (10c) of the lid panel (10b) attached to Orikuse the auxiliary bending unit (28),
Suction holding means (34) that holds the lid panel (10b) by suction and rotates in the opening and closing direction of the lid panel (10b) with reference to the crease line (K ₁ ) with the body (10a); ,
Pivots when said cover panel (10b) is lifted by the suction holding means (34), based on the fold line (K ₂₎ of the lid panel (10b) in contact with the insertion piece (10c) In addition to guiding the bending, when the lid panel (10b) is lifted up to a predetermined position, the tip of the insertion piece (10c) is supported so that it is located inside the opening of the trunk (10a), and the insertion A guide member (36b) set to insert and guide the piece (10c) into the body (10a);
The guide member (36b) is disposed so as to be rotatable integrally with the guide member (36b), and the lid panel (10b) is allowed to open and close when the guide member (36b) rotates in a direction for guiding the insertion piece (10c). When the guide member (36b) rotates in the opposite direction, the lid panel (10b) is pushed in the closing direction, and the trunk of the box (10) is transferred downstream after the lid is closed ( 10a) A lid closing device for a boxing machine comprising a pressing member (36a) set so as to hold the lid panel (10b) so that the insertion piece (10c) does not come out from inside. A rotation fulcrum of the suction holding means (34) is set to coincide with an opening / closing fulcrum formed by a crease line (K ₁ ) with the body (10a) of the lid panel (10b). The lid closing device of the boxing machine according to 1.

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