JP4525355B2 - Square container folding device - Google Patents

Description

  The present invention relates to a folding device for a rectangular container that manually reduces a volume of a relatively large and rigid rectangular container such as an 18-liter can.

As a conventional apparatus for reducing the volume of this type of rectangular container, for example, those described in Patent Documents 1 to 3 are known.
In the apparatus described in Patent Document 1, punching cylinders are arranged on the left and right of a horizontally disposed waste can, and the top plate and bottom plate of the waste can are cut by a cutting blade attached to the punching cylinder, and then the upper portion of the waste can The body portion is compressed up and down by a compression cylinder arranged in the plate and pressed into a flat plate shape.

However, the apparatus described in Patent Document 1 is expensive because the equipment for the punching cylinder and the compression cylinder is large.
In addition, since the top plate and bottom plate of the waste can are cut and separated, it is dangerous because the edge portion of the cut portion is exposed, and there is also a problem that the residue remaining inside the can is scattered.

On the other hand, the one described in Patent Document 2 is a manual type, in which one end of the pressing lever is pivotally mounted on the base so as to be pivotable up and down, and the rectangular container placed on the base is leveraged by the pressing lever. It is the structure provided with the 1st press part located near the free end of a press lever, and the 2nd press part located in the side near the fulcrum of a press lever rather than a 1st press part. It was. The crushing operation is performed by compressing the container body horizontally placed by the first pressing part up and down to form a triangular concave part on the upper and lower side surfaces, and the triangular concave part is positioned on the side of the half-crushed container. Thus, it is rotated 90 ° and arranged in the second pressing portion, and the concave portion is bent at the second pressing portion and compressed up and down until it becomes a flat shape.
The one described in Patent Document 3 is also a manual type, and like the Patent Document 2, one end of a pressing lever is pivotally attached to the base so as to be pivotable up and down. The center portion of the container body portion is crushed by the portion, and the bottom plate portion side and the top plate portion side portions left and right of the crushed center portion are crushed by the second pressing portion.

  However, since the apparatus described in Patent Documents 2 and 3 is a two-station type in which the pressing portion is provided in two places, the weight of the apparatus is large, and it is difficult to use for private stores and general users. Met.

In addition, since the container is forcibly crushed during the crushing process, the can material is locally broken and the edges are exposed, which is dangerous.
In addition, since the rectangular container is crushed horizontally, there is also a problem that if the residue remains inside, the residue spills from the opening of the lying top plate and the surroundings become dirty.
JP-A-8-118090 JP 2000-197994 A JP 2000-107897 A

  The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to forcefully deform the body portion with the top plate portion and the bottom plate portion as they are, and with a light force. In addition, an object of the present invention is to provide a folding device for a rectangular container that can be folded safely.

In order to achieve the above object, the invention according to claim 1 is a container body having four side parts, front, rear, left, and right sides, a top plate that closes the upper end of the container body, and a lower end of the container body. A bottom plate portion, the left and right side portions of the container body portion are folded inward in the vertical direction, the top plate portion is folded on one side surface side of the front and back side surface portions of the container body portion, and the bottom plate portion is disposed on the other side surface portion side. A folding device for a rectangular container that folds and reduces the volume,
A base plate for supporting the bottom plate portion, a presser plate for pressing the top plate portion, a first pushing member for pushing the folding position of the top plate portion of one of the front and rear side portions of the container body portion into the container, A second pushing member for pushing the folding position of the bottom plate part of the other side part of the front and rear side parts of the container body part into the container, and a presser board guide for supporting the presser board movably in the vertical direction with respect to the base plate Means, a compression means for compressing the rectangular container in the axial direction by tightening the space between the base plate and the presser plate, a compressing operation of the presser plate and a side portion of the container body portion by the first pusher member. The first push-in member guiding means for bending the top plate portion folding position simultaneously with the compression by interlocking the push-in operation of the press plate, and the container body portion by the compression operation of the presser plate and the second push-in member engaged with the second push-in member The side part A second pushing member guide means for bending at the same time the bottom plate portion folded position compressed in conjunction, with a
The first pushing member guiding means and the second pushing member guiding means separate the first pushing member and the second pushing member in the middle of bending the top plate portion folding position and the bottom plate portion folding position of the front and rear side portions of the container body portion. The first pushing member and the second pushing member are configured to automatically escape from the front and rear side portions of the container body .

The invention according to claim 2 is provided with fold line forming means for forming the volume reduction induction fold line by pushing the four corner portions of the left and right side surface portions of the body portion into the container before the folding operation. And
According to a third aspect of the present invention, the folding line forming means is configured such that the pushing state is locked at the initial stage of folding, and the lock is automatically released during folding.

The invention according to claim 4 is provided with self-supporting means for urging the presser board in a direction away from the base plate and holding the presser plate in a state of being separated from the base plate in a free state. .

The invention according to claim 5 is characterized in that the compression means includes a winch mechanism.
The invention according to claim 6 is characterized in that the compression means includes an operation lever that winds up the winch mechanism by lever action.

In the invention according to claim 7 , the compression means includes a winch mechanism and an operation lever that winds up the winch mechanism by lever action, and the folding line forming means is operated using an operation lever that operates the winch mechanism. It is characterized by.

In the invention according to claim 8 , the body portion of the rectangular container is provided with a crease guide portion that becomes a fold when folded, and the end portion of the crease guide portion provided toward the corner portion of the left and right side portions is a corner portion. The crease guiding portion and the corner portion are connected by a volume-reducing fold line formed by the crease forming means.

According to the folding device for the rectangular container according to claim 1, the top plate portion and the bottom plate are bent while the folding positions of the top plate portion and the bottom plate portion of the front and rear side surfaces of the trunk portion are bent by the first pushing member and the second pushing member. Since it is the structure which compresses and folds between parts, folding of a trunk | drum advances smoothly and it can fold with a light force.
Further, the first and second pushing guide means are configured to push the front and rear side surfaces of the body portion in conjunction with the compression operation, so that the folding can be performed simply by operating the compression means, and the operation is simple. It is.

Further , since the first pushing member and the second pushing member are automatically released from the bent portion during the bending of the front and rear side surfaces of the body portion, the first pushing member and the second pushing member to be compressed are bent. The operation to remove from the unit becomes unnecessary.

According to the invention which concerns on Claim 2 , by forming a volume-reduction induction fold line in the four corners of the left and right side parts of the trunk before the folding operation by the folding line forming means, It is possible to fold up exactly to the part and to achieve high volume reduction.
According to the invention of claim 3 , since the pushing state by the fold line forming means is locked at the initial stage of folding, the fold can be surely guided along the formed volume-reduction fold line. Since the lock is automatically released after the crease is formed, it is particularly easy to operate.

According to the fourth aspect of the invention, since the presser plate is held away from the base plate by the urging force of the self-supporting means, the rectangular container can be easily set on the base plate. The folded container can be easily taken out after the folding.

According to the invention which concerns on Claim 5 , since the winch mechanism was used as a compression means, it is small and can obtain a big compression load. Therefore, it is possible to achieve a high volume reduction while being space-saving, lightweight and compact.
According to the sixth aspect of the present invention, the winch mechanism is rotated by the lever action of the operation lever, so that the winch can be rotated with a smaller force. In addition, the operation is easy to understand because only the operation lever is operated.

According to the invention which concerns on Claim 7 , it has the structure which operates a folding line formation means using the operation lever which operates a winch mechanism, and both operation of pushing and compression is interlocked with one operation lever. Since it can be performed, the operation is easy.

According to the eighth aspect of the present invention, the end portion of the crease guiding portion provided toward the corner portion of the left and right side surface portions extends to the front of the corner portion, and the volume-reducing fold line formed by the crease forming means is used. Since the crease guiding portion and the corner portion are connected, high volume reduction can be achieved without impairing the rigidity against the axial load during use.

The present invention will be described below based on the illustrated embodiments.
1 to 9 show a rectangular container folding device according to an embodiment of the present invention, and FIG. 10 shows a rectangular container to be folded.
The rectangular container 100 is a metal 18 liter can, as shown in FIG. 10, as shown in FIG. 10, a quadrangular body portion 101 having front, rear, left and right sides, a top plate portion 102 fastened to the upper end of the body portion 101, The bottom plate portion 103 is fastened and fixed to the lower end of the body portion 101. In FIG. 10A, the front side surface portion 101C and the left side surface portion 101A are visible, and in FIG. 10B, the rear side surface portion 101D and the right side surface portion 101B are visible. When folding, as shown in FIG. 10D, the left and right side surface portions 101A and 101B of the body portion 101 are folded inward in the vertical direction, the top plate portion 102 is placed on the front side surface portion 101C side, and the bottom plate portion 103 is placed on the rear side. The side volume 101D side is folded in a Z shape to reduce the volume.

The rectangular container 100 is formed with a fold guiding portion that becomes a fold when folded. The crease guiding portions formed on the left and right side surface portions 101A and 101B are a longitudinal valley fold guiding portion F1 extending in the longitudinal direction, and a front and rear corner C2 of the upper side from the branch point P1 at the upper end of the longitudinal valley fold guiding portion F1. The upper branch valley fold guiding portions F2 and F3 branching and extending in two directions toward C3 and the two directions from the lower branch point P2 of the vertical valley fold guiding portion F1 toward the front and rear corners C4 and C5 of the lower side Lower branch valley fold guiding portions F4 and F5 are provided that extend in a branched manner. Further, a mountain fold guiding portion F8 extending in parallel with the top plate portion 102 from the branch point P1 to the front is provided, and a mountain fold guiding portion F9 extending in parallel to the bottom plate portion 103 from the branch point P2 to the rear. ing.
The branch point P1 is determined geometrically. The branch point P2 is located downward from the top plate part 102 by approximately half of the length in the front-rear direction of the body part 101. The branch point P2 is the body part upward from the bottom plate part 103. 101 is located at a position separated by approximately half of the length in the front-rear direction.

The front side surface portion 101 </ b> C is provided with a lateral valley fold guiding portion F <b> 6 that becomes a fold when the top plate portion 102 is folded. The horizontal valley fold guiding portion F6 is parallel to the top plate portion 102 at a position that is spaced apart from the top plate portion 102 by approximately half of the length in the front-rear direction of the body portion 101, corresponding to the left and right branch point P1. Is provided.
The rear side surface portion 101D is provided with a lateral valley fold guiding portion F7 that becomes a fold when the bottom plate portion 103 is folded. The lateral valley fold guiding portion F7 is provided in parallel with the bottom plate portion 103 at a position separated from the bottom plate portion 103 by approximately half of the length in the front-rear direction of the body portion 101, corresponding to the left and right branch point P2. It has been.

Since the corners C2 to C5 on the upper and lower sides of the left and right side surfaces 101A and 101B are highly rigid and difficult to break, the upper branch valley fold guiding portions F2 and F3 and the lower branch valley fold guiding portion F4 are required for high volume reduction. , F5 are preferably extended to the corners C2, C3, C4, C5. However, if it is extended to the corner, the axial load strength becomes weak, and there is a risk of deformation during normal use such as loading.
Therefore, in this embodiment, the upper branch valley fold guiding portions F2 and F3 and the lower branch valley fold guiding portions F4 and F5 have an end portion which is a predetermined dimension up to the corners C2, C3, C4 and C5. As shown by a two-dot chain line in FIG. 10C, the upper branch valley fold guiding portions F2 and F3, the lower branch valley fold guiding portions F4 and F5, and the corner portions C2 are formed in the lock structure and the initial operation by the folding device. Guide folding lines F12, F13, F14, and F15 connecting C3, C4, and C5 are provided.
In this way, it is possible to achieve a high volume reduction without impairing the rigidity with respect to the axial load at the time of loading and transporting.

In the illustrated example, the left and right side surfaces 101A and 101B are beads formed in a convex shape toward the outside of the container in order to improve the rigidity of the rectangular container, with a margin left between the four sides. A rectangular frame region 110 surrounded by a portion 112 is formed, and in this frame region 110, a vertical valley fold guiding portion F1, an upper branch valley fold guiding portion F2, F3, a lower branch valley fold guiding portion F4, F5, and Mountain fold guiding portions F8 and F9 are formed. The frame region 110 is a flat surface, and the surface height is substantially the same as that of the corner portion 111. Further, the transverse valley fold guiding portions F6 and F7 are also provided in a rectangular frame region 110 formed with a margin between the front and rear side surface portions 101C and 101D.
Therefore, the axial load acting on the rectangular container 100 functions as a column in which the four corner portions 111 between the left and right side surface portions 101A and 101B and the front and rear side surface portions 101C and 101D where the frame region 110 is not formed maintain the axial load strength. To do.

  In the example shown in the figure, the crease guiding portion is configured by a concavo-convex line having a predetermined width extending along the guide line for guiding the crease (the valley fold is a concave line, and the mountain fold is a convex line. Strip), not only a continuous configuration, but also a configuration in which a large number of dot-like irregularities are provided along the guide line.

As shown in FIGS. 1 and 2, the folding device 1 includes a base plate 10 that supports the bottom plate portion 103 of the rectangular container, a presser plate 20 that supports the top plate portion 102 of the rectangular container, and the front of the container body portion 101. A first pushing member 50 for pushing the folding position of the top plate portion of the side surface portion 101C into the container; a second pushing member 60 for pushing the folding position of the bottom plate portion of the rear side surface portion 101D of the container body portion 101 into the inside of the container; The presser board guide mechanism 30 as a presser board guide means for supporting the presser board 20 movably in the vertical direction with respect to the base board 10 and the space between the base board 10 and the presser board 20 are tightened to compress the rectangular container in the axial direction. The compression mechanism 40 as the compression means to be engaged with the first push-in member 50, the compression operation of the presser plate 20 and the push-in operation of the front side surface portion 101A by the first push-in member 50 are interlocked to perform compression and the top plate portion. The first push-in member guide mechanism 51 that bends the folding position and the second push-in member 60 are engaged to perform the compression operation of the presser plate 20 and the push-in operation of the rear side surface portion 101D of the container body 101 by the second push-in member 60. The second push-in member guide mechanism 61 is provided that interlocks and bends the bottom plate portion folding position simultaneously with the compression.

Further, before the compression operation, the four corner portions C1, C2, C3, C4 of the left and right side surfaces 101A, 101B of the trunk portion 100 are pushed in to form the volume reduction induction folding lines F12, F13, F14, F15. The fold line forming mechanism 70 as the line forming means and the presser board 20 are urged in a direction in which the presser board 20 is separated from the base board 10, and the presser board 20 is separated from the base board 10 in a state where the compression force by the compression mechanism 40 is released. A self-supporting mechanism 80 is provided to hold it in this state.

The platform 10 includes a rectangular base body 11 on which the bottom plate portion 103 of the square container 100 is placed, and support legs 12 that support the base body 11 at a predetermined height. A stopper member 13 with which the front end edge of the bottom plate portion 103 of 100 abuts is provided. Further, although not shown, a guide portion for positioning the rectangular container 100 on the left and right is provided.

  The presser board 20 is a quadrangular plate-like member disposed in parallel to face the base body 11 of the base board 10 and presses the top plate portion 102 of the rectangular container 100.

The presser board guide mechanism 30 is arranged in a pair on the left and right sides of the rectangular container 100 supported by the base board 10 and guides the presser board 20 in the vertical direction while holding the presser board 20 parallel to the base board 10. 10 and the intermediate connection member 31 arranged in parallel between the presser board 20, a lower link mechanism 32 that connects the intermediate connection member 31 and the base plate 10, and an upper stage that connects the connection link member 34 and the presser board 20. And a link mechanism 33.

  The lower link mechanism 32 and the upper link mechanism 33 include a plurality of link members 321 and 331 that are parallel to each other. In the illustrated example, two link members 321 of the lower link mechanism 32 are arranged in the front and rear, two link members 331 of the upper link mechanism 33 are arranged in the front and rear, and one in the middle.

Further, in order to expand and contract the upper link mechanism 33 and the lower link mechanism 32 at a certain ratio, the middle link member 331 of the three link members 331 of the upper link mechanism 33 and the two link members before and after the lower link mechanism 32. A front link member 321 of the links 321 is pivotally connected by a connection link member 34. The expansion / contraction ratio of the upper link mechanism 33 and the lower link mechanism 32 is determined by the pivot position of the connecting link member 34 with respect to each link member.
The ratio of the length of the upper link mechanism 33 to the length of the lower link mechanism 32 is such that the height of the rear side surface portion 101C of the rectangular container is set to the top plate portion folding position (half the longitudinal length of the trunk portion from the top plate portion 102). The ratio of the intermediate connecting member 31 matches the folding position of the top plate portion of the front side surface portion 101C. When the presser plate 20 moves downward, the upper link mechanism 33 and the lower link mechanism 32 are bent into a U-shape through the intermediate connecting member 31, and the intermediate connecting member 31 moves rearward.
Further, as the folding progresses, the front side surface portion 101 </ b> C falls forward, and the top plate portion 20 is displaced in parallel to the bottom plate portion 10, but the presser plate 20 follows the displacement of the top plate portion 20. Is displaced forward.

  As shown in FIG. 4, the first push-in member guide mechanism 51 uses the movement of the intermediate link member 31 that connects the lower link mechanism 32 and the upper link mechanism 33 that form the presser plate guide mechanism 30. An engaging pin 52 is provided at the front end of the intermediate connecting member 31 of the guide mechanism 30 so that the first pushing member 50 can be freely engaged and disengaged. In this embodiment, the engaging pin 52 is also used as a connecting pin for connecting the link members 331 and 332 of the upper link mechanism 33 and the lower link mechanism 32. Of course, the engaging pin 52 may be provided separately from the connecting pin.

The first pushing member 50 includes a first pushing bar 54 that linearly extends to the left and right along the front side surface portion 101C of the body portion 101, and the first pushing bar 54 with respect to the presser plate 20 via a support shaft 55a. An arm 55 that swingably supports in the front-rear direction, a release spring mechanism 56 that constantly applies a biasing force in a direction in which the first push-in bar 50 is separated from the front side surface portion 101C (clockwise direction in the figure), and a first push-in A return spring mechanism 57 is provided to urge the bar 54 in a direction (counterclockwise direction in the drawing) in which the bar 54 approaches the front side surface portion 101C.

An inverted L-shaped engagement claw 53 that is detachably engageable with the engagement pin 52 of the intermediate connecting member 31 is fixed to the first push-in bar 54. The engaging claw 53 is engaged with the engaging pin 52 on the body side, and the engaging claw 53 is provided with a pin holding portion 53a opened on the side opposite to the body. The first push-in bar 54 is supported by the arm 55 so as to be reversible to the side opposite to the trunk (forward) with respect to the arm 55 via the hinge portion 541, and the engagement claw 53 is opposed to the engagement pin 52. When moving relative to the barrel side, the back surface of the engagement claw 53 is pushed by the engagement pin 52 and reverses to the opposite barrel side, moves over the engagement pin 52 and moves to the barrel side. An engagement pin 52 is engaged with a pin holding portion 53a opened on the body side (see FIGS. 4B and 4C).
The hinge portion 541 is pivotally connected at a position spaced upward by a predetermined dimension from the distal end portion of the arm 55 on the side opposite to the body portion, and from the closed position contacting the arm side surface on the side of the arm body to the side opposite to the body portion. Is rotatable and cannot be rotated from the closed position to the body side, and the first push-in bar 54 is locked to the tip of the arm 55. A return spring 542 is provided between the arm 55 and the first push bar 54 so that the first push bar 54 is always urged to rotate forward, and the hinge portion 541 is in contact with the side surface of the arm 55 opposite to the body side. Always energized (counterclockwise in the figure).

In the illustrated example, the escape spring mechanism 56 is configured by a coil spring that connects the presser plate 20 and the arm 55, and always urges the first push bar 54 in a direction in which the first push bar 54 is separated from the front side surface portion 101 </ b> C of the trunk portion. .
The return spring mechanism 57 applies a biasing force larger than the biasing force of the escape spring mechanism 56 when the presser board guide mechanism 30 is in the fully extended state, and the folding progresses so that the distance between the presser board 20 and the base board 10 decreases. As shown in FIGS. 1, 2, and 4, the lever 571 is fixed to the pivot shaft 55 a of the arm 55, and is interposed between the lever 571 and the base plate 10. And a spring member 572 such as a coil spring. In this example, a string member 573 such as a wire is connected in series to the spring member 572, and the spring member 572 is pulled before being folded, and the lever 571 is pulled downward by its elastic restoring force. When the folding progresses to some extent and the first push-in bar 54 escapes from the bent portion of the front side surface portion 101C, the spring member 572 returns to the free state, and the urging force acting on the lever 571 becomes zero.

The engaging claw 53 of the first pushing member 50 is configured to automatically escape from the engaging pin 52 of the first pushing member guide mechanism 51 during the bending of the top plate portion folding position of the front side surface portion 101C. That is, the engaging claw 53 is engaged with the engaging pin 52 from the initial state before folding until it is folded, and when the bending of the upper link mechanism 33 and the lower link mechanism 32 reaches a predetermined amount, The pawl 53 is disengaged from the engaging pin 52.
In this embodiment, the length of the arm 55 of the first push-in member 50 is made longer than the link member 331 of the upper link mechanism 33 so that the movement locus Y of the engagement claw 53 is different from the movement locus X of the engagement pin 52. The presser board guide mechanism 30 is set so that the movement locus of the engagement pin 52 and the engagement claw 53 coincides at one point in the extended state (Q position in the figure).

In the illustrated example, since the connecting portion of the link member 331 at the foremost end of the upper link mechanism 33 is the engaging pin 52, the movement locus X of the engaging pin 52 coincides with the moving locus of the connecting portion of the link member 331. In this case, the positional relationship is such that the position of the support shaft 55a of the first pushing member 50 is offset by a predetermined amount from the position of the support shaft 331a with respect to the presser plate 20 of the link member 331.
As the presser board 20 moves downward and the presser board guide mechanism 30 bends from the extended state, the position of the engaging claw 53 gradually shifts upward with respect to the engaging pin 52 and comes off when reaching a predetermined amount. (R position in the figure). When it is disengaged from the engagement pin 52, it is largely released forward by the spring force of the escape spring mechanism 56 (S position in the figure).

On the other hand, as shown in FIG. 5, the second push-in member guide mechanism 61 includes an upper link 611 and a lower link that are connected so as to be bent in a U shape on the side opposite to the bending direction of the presser board guide mechanism 30 (front). An engagement pin 62 that is configured by a link 612 and that connects the upper link 611 and the lower link 612 and engages with the second push-in member 60 is provided at a connection portion between the upper link 611 and the lower link 612.
The ratio of the length of the upper link 611 and the length of the lower link 612 is such that the height of the rear side surface portion 101D of the rectangular container is the bottom plate portion folding position (distance half the longitudinal length of the body portion 101 from the bottom plate portion 103). When the presser plate 20 moves downward, the upper link 611 and the lower link 612 are bent at the same bending angle as the bent shape of the rear side surface portion 101D of the body portion 101, and the engagement pin 62 is moved forward. Moving.

The second pushing member 60 includes a second pushing bar 64 that linearly extends left and right along the rear side surface portion 101D of the body portion 101, and the second pushing bar 64 with respect to the presser plate 20 via a support shaft 65a. An arm 65 that swingably supports in the front-rear direction and a release spring mechanism 66 that always applies a biasing force in a direction (counterclockwise direction in the drawing) in which the second push-in bar 64 is separated from the rear side surface portion 101D are provided. ing.
On the second push-in bar 64, an inverted L-shaped engagement claw 63 that is detachably engageable with the engagement pin 52 of the second push-in member guide mechanism 61 is fixed. The engaging claw 63 is engaged with the engaging pin 62 on the body side, and the engaging claw 63 is provided with a pin holding portion 63a opened on the side opposite to the body. The second push-in bar 64 is supported in a reversible manner on the side opposite to the trunk (forward) with respect to the arm 65 via the hinge portion 641, and the engagement claw 63 is opposed to the engagement pin 62 on the side opposite to the trunk. When moving relative to the barrel side, the back surface of the engagement claw 63 is pushed by the engagement pin 62 and reverses to the opposite barrel side, moves over the engagement pin 62 and moves to the barrel side. The engagement pin 62 is engaged with the pin holding portion 63a opened on the body side (see FIGS. 4B and 4C).

The hinge portion 641 is pivotally connected at a position spaced upward by a predetermined dimension from the distal end portion on the side opposite to the body portion of the arm 65, and from the closed position contacting the side surface on the side opposite to the body portion of the arm 65 to the side opposite to the body portion. The arm 65 is rotatable and cannot be rotated from the closed position toward the body side, and the second push-in bar 64 is locked to the tip of the arm 65. A return spring 642 is provided between the arm 65 and the second push bar 64 to constantly rotate the second push bar 64 forward, and the hinge part 641 is brought into contact with the side surface of the arm 65 opposite to the body side. Always energized (counterclockwise in the figure).
The relief spring mechanism 66 constantly applies an urging force to the arm 65, and is constituted by, for example, a coil spring interposed between the presser plate 20 and the arm 65.

The engaging claw 63 of the second pushing member 60 is configured to automatically escape from the engaging claw 62 of the second pushing member guide mechanism 61 during the bending of the bottom plate portion folding position of the rear side surface portion 101D. That is, the engaging claw 63 is engaged with the engaging pin 62 from the initial state before folding until it is folded by a predetermined amount, and when the bending between the upper link 611 and the lower link 612 reaches a predetermined amount, the engaging claw 63 is engaged. The claw 63 is disengaged from the engagement pin 62.
In this embodiment, the length of the arm 65 of the second pushing member 60 is made longer than the upper link 611 so that the swing locus Y ′ of the engagement claw 63 is different from the swing locus X ′ of the engagement pin 62. The presser board guide mechanism 30 is set so that the swinging locus of the engaging pin 62 and the engaging claw 63 coincides at one point in the extended state (Q ′ position in the figure).
As the presser board guide mechanism 30 is bent from the extended state, the position of the engaging claw 63 gradually shifts upward with respect to the engaging pin 62 and comes off when reaching a predetermined amount (R ′ in the figure). position). When it is disengaged from the engaging pin 62, it is largely released backward by the spring force of the escape spring mechanism 66 (position S 'in the figure).

As shown in FIGS. 1, 2 and 3, the compression mechanism 40 is an operation of rotating a pair of left and right winch mechanisms 41 for tightening between the base plate 10 and the presser plate 20 and a winding drum 44 of the winch mechanism 41 by lever action. Lever 42.
The winch mechanism 41 includes an upper shaft 43 that is rotatably supported in the left-right direction at the front end portion of the presser board 20, and a winding drum 44 that is attached to the left and right end portions of the upper shaft 43 so as not to rotate relative to the upper shaft 43. And a wire 45 as a winding member wound around the winding drum 44, a torque transmission switching mechanism 46 for selectively transmitting the rotational torque from the operation lever 42 to the winding drum 44, and the reverse rotation of the winding drum 44. And a reverse rotation prevention mechanism 47.

The operation lever 42 includes a pair of support arms 421 that are supported so as to be relatively rotatable with respect to the upper shaft 43 to which the winding drum 44 is fixed, and a horizontal gripping bar 422 that spans the free end of the support arm 421. It has a structure with.
One end of the wire 45 is wound around the winding drum 44 and the lower end is fixed to a transmission lever 91 attached to the base 10 side.

The torque transmission switching mechanism 46 includes a ratchet 461 that is fixed to the shaft 43 so as not to rotate relative to the shaft 43, and a lock claw 462 that is attached to the operation lever 42 and is detachably engaged with the ratchet 461. The ratchet 461 is disposed between the pair of support arms 421 of the operation lever 42, and the lock claw 462 swings on a claw support plate 463 installed between the support arms 421 of the operation lever 42 corresponding to the position of the ratchet 461. It is attached freely. The lock claw 462 is engaged with the teeth of the ratchet 461 when the operation lever 42 is moved in the downward direction, and transmits the torque in the winding direction to the winding drum 44 via the upper shaft 43. When the operation lever 42 is moved upward, the lock claw 462 is not engaged with the teeth of the ratchet 461, and the operation lever 42 is idled.

The reverse rotation prevention mechanism 47 includes a ratchet 461 common to the torque transmission switching mechanism 46 and a reverse rotation prevention pawl 471 engaged with the ratchet 461. The reverse rotation prevention pawl 471 is swingably supported on the front wall of the presser plate 20 and engages with the ratchet 461 to allow the winding drum 44 to rotate in the winding direction and is opposite to the winding direction of the winding drum 44. It prevents rotation in the rewind direction. Further, the reverse rotation prevention pawl 471 can also take an unlocking position to be separated from the ratchet 461.

In this embodiment, the clamping force transmission mechanism 90 that transmits the clamping force by the winch mechanism 41 to the first pushing member 50 and the second pushing member 60 via the first and second pushing member guide mechanisms 51 and 61 is provided. Is provided.
The tightening force transmission mechanism 90 is swingably attached to the base 10 and has a transmission lever 91 to which the wire 45 of the winch mechanism 41 is fixed at one end, the other end of the transmission lever 91, and the lower link of the presser board guide mechanism 30. A link member 321 located at the front end of the mechanism 32 and a Y-shaped transmission link mechanism 92 pivotally supported by the engagement pin 60 of the second push-in member guide mechanism 60 are provided.
The transmission lever 91 is fixed to a lower shaft 93 that is rotatably supported by the base plate 10 in parallel with the upper shaft 43 on which the winch mechanism 41 is supported. And is supported so as to be relatively rotatable. The lower end of the wire 45 of the winch mechanism 41 is fixed to the front end of the transmission lever 91 at the front end of the transmission lever 91, and the transmission link mechanism 92 is connected to the rear end.

The transmission link mechanism 92 includes a first link 921 coupled to an intermediate portion of the front lower link 321 of the lower link mechanism 32 constituting the first push member guide mechanism 51, an upper link 611 of the second push member guide mechanism 61, and A second link 922 pivotally connected to the connecting portion of the lower link 612 by an engagement pin 62, a third link 923 collectively connected to the other end of the first link 921 and the second link 922, The fourth link 924 is pivotally connected to the third link 923, and the fourth link 924 is pivotally connected to the end opposite to the wire fixing end to which the wire 45 of the transmission lever 91 is fixed.

As shown in FIG. 1, the fold line forming mechanism 70 is provided at the left and right side edges of the presser board 20, and is provided at the upper corners C2 and C3 of the left and right side surfaces 101A and 101B of the body 101. A pair of left and right upper folding line forming tools 71 provided with blades 712 for forming F13, and volume-reduction induction folding at lower corners C4 and C5 of the left and right side surfaces of the body provided on the left and right side edges of the base 10 A pair of left and right lower fold line forming tools 72 provided with blades 722 for forming lines F14 and F15, and a pushing operation mechanism 73 for pushing the blades 712 of the upper fold line forming tools 71 arranged on the presser board 20; A motion transmission mechanism 74 that operates the lower fold line forming tool 72 in synchronization with the upper fold line forming tool 71.
The upper fold line forming tool 71 extends in parallel with the left and right side surfaces of the barrel portion in the front-rear direction along the left and right side edges of the presser plate 20, and is rotatably supported on the side surface of the presser plate 20, and the container barrel portion 101. Corresponding to the upper corners C2 and C3 of the left and right side surface parts 101A, a pair of front and rear blades 712 fixed to the shaft 711 in a C shape, and an operating lever 713 fixed between the blades 712. , By rotating the shaft 711, the blade 712 is pushed toward the left and right side surfaces 101A and 101B of the container body, and the volume reduction induction fold lines F12 and F3 are inserted into the corners C2 and C3 on the upper sides of the left and right side surfaces 101A and 101B. F13 is formed.

The lower fold line forming tool 72 extends in parallel with the left and right side surface portions 101A and 101B of the trunk portion in the front-rear direction along the left and right side edges of the base plate 10, and a shaft 721 that is rotatably supported on the side surface of the base plate 10. A pair of front and rear blades 722 fixed to the shaft 721 corresponding to the lower even corner portions C4 and C5 of the left and right side surface portions 101A and 101B of the container body, and the blade 722 is moved to the left and right via the shaft 721. The volume reduction induction folding lines F14 and F15 are formed by being pushed into the corners on the lower sides of the side surfaces 101A and 101B.

  The push-in operation mechanism 73 is a toggle link mechanism, and as shown in FIGS. 3 and 6, a first link 731 having one end pivotally connected to a bracket 735 protruding on the presser plate 20 and a first link 731. The second link 732 is pivotally connected to the other end and pivotally connected to the operating lever 713 of the shaft 711 of the upper folding line forming tool 71. A spring 734 is interposed in a contracted state between the connecting portion 733 of the first link 731 and the second link 732 and the presser board 20. In the free state, the connecting portion 733 is bent upward in a U-shape and is in a contracted state, and the blade 712 of the upper fold line forming tool 71 is separated from the body side surface portions 101A and 101B.

On the other hand, the left and right support arms 421 of the operation lever 42 are in a positional relationship to engage with the connecting portions 733 of the first and second links 731 and 732 constituting the push-in operation mechanism 73, and the operation lever 42 attaches the spring 734. By pushing the connecting portion 733 downward against the force, the first link 731 and the second link 732 are linearly extended, the operating lever 713 of the upper folding line forming tool 71 is pushed outward, and the shaft 711 is pushed. And the blade 712 is rotated.
In this example, as shown in FIG. 7 (A), the connecting portion 733 is bent further downward beyond the thought point of the linear state, so that the pushing reaction force from the pushed side portions 101A and 101B and the spring 734 are reduced. The urging force is balanced and locked. When the folding progresses and the pushing reaction force stops working, the connecting portion 733 of the first link 731 and the second link 732 exceeds the thought point by the elastic restoring force of the spring 734 as shown in FIG. Bend upward again.

The motion transmission mechanism 74 from the upper fold line forming tool 71 to the lower fold line forming tool 72 includes a transmission lever 741 provided at the end of the shaft 711 of the upper fold line forming tool 71 and the shaft of the lower fold line forming tool 72. A driven lever 742 provided at the end of 721 is connected by a wire 743. A return lever 745 is fixed to the shaft 721 of the left and right lower fold line forming tools 72, and the blades 722 of the left and right lower fold line forming tools 72 are allowed to escape from the left and right side surfaces 101A and 101B between the left and right return levers 745. A return spring 744 that biases in the direction is interposed.
The rotational torque applied to the upper fold line forming tool 71 via the pushing operation mechanism 73 is transmitted to the lower fold line forming tool 72 via the transmission lever 741, the wire 743 and the driven lever 742, and the lower fold line forming tool 72 is transmitted. The shaft 721 rotates in the opposite direction to the upper folding line forming tool 71 so as to push the blade 722 into the lower corner portions C4 and C5 of the left and right side surface portions 101A and 101B.
When the folding progresses and the wire 743 of the motion transmission mechanism 74 sags, the blade 722 is returned in a direction away from the left and right side surfaces 101A and 101B of the body by the spring force of the return spring 744.

As shown in FIG. 1, the self-supporting mechanism 80 includes an upper link 81 having one end pivotally supported by the presser board 20, a lower link 82 having one end pivotally supported by the base 10, and an upper link 81 and a lower link 82. An intermediate link 83 that connects the free ends, and a gas spring 84 that is disposed between the upper link 81 and the lower link 82 and that is constantly biased in a direction to open between the upper link 81 and the lower link 82. Has been. The gas spring 84 always urges the presser board 20 in a direction away from the base board 10 and a direction in which the presser board guide mechanism 30 extends vertically. The gas spring 84 always urges the presser board 20 upward with a constant urging force regardless of the length of expansion and contraction.

Next, an operation method of the folding device for the rectangular container according to the present embodiment will be described.
In the free state, the presser board 20 is urged upward by the self-standing mechanism 80, and the presser board guide mechanism 30 is held in the extended state. In this state, the rectangular container 100 is placed on the base 10 and pushed forward until the front side surface portion 101 </ b> C of the rectangular container 100 contacts the stopper 13.

Next, the lock claw 462 of the torque transmission switching mechanism 46 is removed from the ratchet 461 so that the operation lever 42 can be rotated. By the operation lever 42, the connecting portion 733 between the first push-in link 731 and the second push-in link 732. Press down. In the initial state, the first and second links 731 and 732 of the push-in operation mechanism 73 are separated from the position of the support arm 421 of the operation lever 42 in the most contracted state, as shown in FIG. Therefore, the connecting portion 733 is pushed down by hand and adjusted to a position below the support arm 421 of the operation lever 42.
By pushing down the connecting portion 733 with the operation lever 42, as shown in FIG. 7A, the first and second push-in links 731 and 732 extend to the left and right, and the operating lever 713 is pushed to the side of the container to move the shaft 711. The blade 712 fixed to the shaft 711 is pressed against the corners C2 and C3 of the left and right side surfaces 101A and 101B of the container to form volume reduction induction fold lines F12 and F13 at the corners (FIG. 7D )reference). At the same time, the lower fold line forming tool 72 rotates in the opposite direction to the upper fold line forming tool 71 via the transmission lever 741, the wire 742 and the driven lever 742 of the motion transmission mechanism 74, and the blade 722 fixed to the shaft 721 is moved to the left and right side surfaces. It presses against the corners C4 and C5 on the lower side of the parts 101A and 101B, and volume-reduction fold lines F14 and F15 are formed at the corners.

By pushing down the operating lever 42 until the connecting portion 733 is positioned below the speculative point, the pushing reaction force from the left and right side portions 101A, 101B is balanced with the spring force of the return spring 743 and locked. The pushing state of 722 is maintained (see FIG. 7A).

Next, the lock claw 462 is engaged with the ratchet 461 of the torque transmission switching mechanism 46, the operation lever 42 is raised and lowered, and the winding drum 44 of the winch mechanism 41 is rotated as shown in FIGS. Then, the wire 45 is wound up. The operation range of the operation lever 42 is arbitrary, and can be arbitrarily set to a height at which the user enters the most force.
The wound wire 45 lifts the front end of the lever 91 of the tightening force transmission mechanism 90 and pulls the third and fourth links 923 and 924 of the transmission link mechanism 92 connected to the rear end of the lever 91 downward. The transmission link mechanism 92 is slightly loose at the start of the folding operation. When the transmission link mechanism 92 is not loosened, the first and second push-in member guide mechanisms 51 and 61 via the first link 921 and the second link 922 are used. The front lower link 321 and the lower link 612 are rotated toward the inside of the container, and are engaged with the first push member 50 and the second push member guide mechanism 61 that are engaged with the first push member guide mechanism 51. The second push-in member 60 pushes the front and rear side surface portions 101A and 101B of the container toward the inside of the container, and starts to squeeze the container back and forth.

Simultaneously with the movement of the first and second pushing members 50 and 60, the presser board guide mechanism 30 is bent, and the presser board 20 moves downward to compress the container 100 in the axial direction.
Since the left and right side surface portions 101A and 101B are maintained in a state of being pushed inward by the blades 712 and 722 of the upper fold line forming tool 71 and the lower fold line forming tool 72 of the fold line forming mechanism 70, the rear side surface portions 101C and front side surface portion 101D bend inward of the container along lateral valley fold guiding portions F6, F7, and at the same time, mountain fold guiding portions F8, F9 bend in a mountain fold state, and vertical valley fold guiding portion F1, upper Folding folds are formed at the inner side of the container along the branch valley fold guiding portions F2, F3, the upper volume reduction guiding fold lines F12, F13, the lower branch valley fold guiding portions F4, F5 and the lower volume reduction guiding fold lines F14, F15. It is formed (see FIG. 9D).

In this way, the container is compressed while the front and rear side surfaces 101A and 101B of the container are bent by the first pushing member 50 and the second pushing member 60, so that the initial fold can be formed with a very small force.
When the wire 45 is further wound up, the folding proceeds, and the engaging claw 53 of the first pushing member 50 of the intermediate connecting member 31 constituting the first pushing member guide mechanism 51 is shown in FIG. 8B. While being disengaged from the engaging pin 52, the engaging claw 63 of the second pushing member 60 is disengaged from the engaging pin 62 of the second pushing member guide mechanism 61 and is released from the bent portion by the relief spring mechanisms 56 and 66, respectively. Further, the transmission link mechanism 92 is loosened so that no force is transmitted to the first and second pushing member guide mechanisms 51 and 61.

Further, the pushing reaction force from the left and right side surfaces also does not act on the folding line forming mechanism 70, and as shown in FIG. 7B, the elastic restoring force of the spring 734 causes the first link 731 and the second link 732 to move. The connecting portion 733 bends upward beyond the thought point and returns to the original position, and the blades 712 and 722 of the upper fold line forming tool 71 and the lower fold line forming tool 72 are separated from the left and right side surface portions 101A and 101B.

Further, as shown in FIG. 8C, the rectangular container 100 is shown in FIGS. 8E and 8F by winding the wire 45 by the operation lever 72 and fastening between the top plate portion 102 and the bottom plate portion 103. As shown in FIG. 9A, the folding proceeds to the Z shape.
In the present invention, the volume reduction induction fold lines F12 to F15 are inserted into the four corner portions C2 to C5 of the left and right side surface portions 101A and 101B of the body portion 101, so that the corner portions can be folded without gaps, and high volume reduction is achieved. Can be realized. As a result of the folding test with the prototype, as shown in FIG. 9B, the volume H1 after folding was reduced to about 60 mm with respect to the original height H0 of 350 mm.
Further, since the left and right side surface portions 101A and 101B can be folded accurately, the folded left and right side surface portions 101A and 101B are completely hidden between the front and rear side surface portions 101C and 101D, as shown in FIG. 9C. The side portions 101C and 101D can be folded within the range of the width. Since the width does not increase in this way, the folded container can be stored using the packing box in which the rectangular container is stored.

When the folding is completed, the reverse rotation preventing claw 471 of the ratchet 461 is removed. Then, the presser board 20 is lifted upward by the urging force of the gas spring 84 of the self-standing mechanism 80, and the presser board guide mechanism 30 returns to the extended state.
In the process of moving the presser plate 20 upward, the spring member 572 of the return spring mechanism 57 extends to urge the lever 571 counterclockwise in the drawing, and the arm 55 is resisted against the spring force of the release spring mechanism 56. Rotate counterclockwise. When the presser board guide mechanism 30 comes close to the most extended state, the engaging claw 53 automatically engages with the engaging pin 52 provided on the intermediate connecting member 31 of the presser board guide mechanism 30 constituting the first pushing member guide mechanism. To do.

When the presser board guide mechanism 30 returns to the extended state, the driven lever 742 and the wire 743 are driven by the spring force of the return spring mechanism 744 of the motion transmission mechanism 74 of the fold line forming mechanism 70 as shown in FIG. , The upper fold line forming tool 71 is rotated via the transmission lever 741 in a direction in which the blade 712 is separated from the left and right side surfaces 101A and 101B.
On the other hand, if the second pushing member 60 is pushed by hand, the engaging claw 63 automatically engages with the engaging pin 62 of the second pushing member guide mechanism 61.

Since the reverse rotation preventing claw 471 is located at a position away from the front of the operator, a mechanism for operating it at hand may be provided or may be automated.
FIG. 11 shows an example of an automatic engagement mechanism.
In the illustrated example, when the push operation mechanism 73 of the folding line forming mechanism 70 is locked, the reverse rotation prevention pawl 471 is moved from the disengaged position away from the ratchet 461 to the engaged position with the ratchet 461. 20, a bell crank 481 is provided so as to be swingable, and one end 481a of the bell crank 481 is engaged with the reverse rotation prevention claw pushing operation mechanism 73, and the other end 481b of the bell crank 481 and the reverse rotation prevention claw 471 are connected to a connecting member such as a string. The connection is made by 482.

On the other hand, as a mechanism for detaching the reverse rotation preventing claw 471, an escape shaft 49 penetrating the presser plate 20 and movable in the vertical direction is provided. When the lower end of the escape shaft 49 is lifted by the front side surface portion 101C of the container at the end of folding, the upper end engages with the reverse rotation prevention pawl 471 and pushes upward to rotate to the escape position. A flange portion 491 that engages with the upper surface of the presser plate 20 to prevent downward slippage is provided in the middle portion of the escape shaft 49.
In this way, when the folding progresses to a predetermined thickness, the escape shaft 49 is pushed up by the front side surface portion 101C, so that the reverse rotation prevention pawl 471 is automatically released and the ratchet is free to rotate in the rewinding direction. The presser board 20 automatically moves upward by the urging force of the mechanism 80.

In addition, although the metal square container was demonstrated in the said embodiment, it is applicable not only to a metal container but to a plastic container. Moreover, although the case where the square container provided with the crease guidance part was folded was demonstrated, it is possible to fold the crease guidance part even if there is no part or all of it.
Further, the presser board guide mechanism, the first and second pushing member guide mechanisms on the front and rear side surfaces, and the fold line forming mechanism on the left and right side surfaces are not limited to the present embodiment, and various configurations can be applied. is there.

FIG. 1 is a side view of a rectangular container folding device according to an embodiment of the present invention before folding. 2 is a partially broken side view showing the first pushing member and the second pushing member in the folding initial state of the folding device of FIG. 3A is a top view of the apparatus of FIG. 1, and FIG. 3B is a cross-sectional view of the ratchet portion of FIG. 4A is a side view of the main part in the vicinity of the first pushing member for explaining the disengagement state of the first pushing member in FIG. 2 from the bent portion, and FIGS. 4B and 4C are the first pushing member. It is the elements on larger scale for demonstrating the state which engages with an engagement pin. FIG. 5A is a side view of the main part in the vicinity of the second pushing member for explaining the disengagement state of the second pushing member of FIG. 2 from the bent portion, and FIGS. 5B and 5C are the second pushing member. It is a principal part enlarged view for demonstrating the state which engages with an engagement pin. FIG. 6 is an overall configuration diagram showing a fold line forming mechanism for the left and right side portions of the body. FIGS. 7A to 7D are views showing the folding line forming step of FIG. FIG. 8 is a view schematically showing a deformed state of the folding device and a deformed state of the container during the folding of the device of FIG. FIG. 9A is a side view of the apparatus of FIG. 1 in the end of folding, FIG. 9B is a schematic side view of the folded rectangular container, and FIG. 9C is a plan view of FIG. . FIG. 10 shows a rectangular container folded by the folding device of the present invention shown in FIG. 1. FIG. 10 (A) is a perspective view before folding, and FIG. 10 (B) is a view from another direction of FIG. FIG. 4C is a diagram showing a pattern of the fold guiding portion on the left side surface portion, and FIG. 4D is a perspective view in a state where the front and rear side surface portions are bent. FIG. 11 is a view showing an example of the automatic engagement / disengagement mechanism of the reverse rotation prevention claw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Folding apparatus 10 Base 11 Base main body, 12 Support leg, 13 Stopper member 20 Presser board 30 Presser board guide mechanism 31 Intermediate connection member 32 Lower link mechanism 321 Lower swing link member 33 Upper link mechanism 331 Upper swing link member 34 Connecting link member 40 Compression mechanism 41 Winch mechanism 42 Operation lever 421 Support arm 422 Grip bar 43 Shaft 44 Winding drum 45 Wire 45
46 Torque transmission switching mechanism 461 Ratchet, 462 Lock claw, 463 Claw support plate 47 Reverse rotation prevention mechanism 471 Reverse rotation prevention claw 48 Automatic engagement mechanism 481 Bell crank, 482 Wire 49 Relief shaft 50 First push member 51 First push member guide mechanism
52 Engagement Pin 53 Engagement Claw 54 First Push-in Bar 541 Hinge Part, 542 Return Spring 55 Arm 55a Spindle 56 Relief Spring Mechanism 57 Return Spring Mechanism 571 Lever, 572 Spring Member, 573 String Body 60 Second Push Member 61 First 2 push-in guide mechanism
611 Upper link, 612 Lower link 62 Engagement pin 63 Engagement claw 64 Second push-in bar 641 Hinge part, 642 Return spring 65 Arm 65a Support shaft 66 Relief spring mechanism 70 Folding line forming mechanism 71 Upper folding line forming tool 711 Shaft 712 Blade 713 Actuating lever 72 Lower fold line forming tool 721 Shaft 722 Blade 73 Pushing operation mechanism 731 First link, 732 Second link, 733 Connection portion 734 Spring, 735 Bracket 74 Motion transmission mechanism 741 Transmission lever, 742 Follow lever, 743 Wire 744 return spring, 745 return lever 80 self-supporting mechanism 81 upper link, 82 lower link, 83 intermediate link,
84 Gas spring 90 Tightening force transmission mechanism 91 Lever,
92 Transmission link mechanism 921 to 924 First to fourth links 100 Square container 101 Trunk portion 101A Left side surface portion 101B Right side surface portion 101C Front side surface portion, 101D Rear side surface portion 102 Top plate portion 103 Bottom plate portion 110 Frame region
111 Corner portion 112 Bead portion F1 Vertical valley fold guiding portion F2, F3 Upper branch valley fold guiding portion F4, F5 Lower branch valley fold guiding portion F6 Lateral valley fold guiding portion F7 Horizontal valley fold guiding portion F8, F9 Mountain fold Guide part F12, F13, F14, F15 Volume reduction induction fold line P1, P2 Branch point C2, C3 Corner part (upper side)
C4, C5 Corner (bottom side)

Claims (8)

A right and left side surface of the container body including a rectangular tube-shaped container body having front, rear, left and right side parts; a top plate part closing the upper end of the container body part; and a bottom plate part closing the lower end of the container body part Folding device for a rectangular container that folds the inside in the vertical direction and folds the top plate on one side of the front and back side of the container body and reduces the volume by folding the bottom on the other side Because
A stand supporting the bottom plate,
A presser foot that holds the top plate,
A first pushing member for pushing the top plate portion folding position of one side surface portion of the front and back side surface portions of the container body portion into the inside of the container;
A second pushing member for pushing the bottom plate portion folding position of the other side surface portion of the front and back side surface portions of the container body portion into the container inside;
A presser board guide means for supporting the presser board movably in the vertical direction with respect to the base board;
A compression means for compressing the rectangular container in the axial direction by tightening between the base plate and the presser plate;
A first push-in member guide that engages with the first push-in member and interlocks the compression operation of the presser plate and the push-in operation of the side surface portion of the container body by the first push-in member to bend the top plate part folding position simultaneously with the compression. Means,
Second pushing member guide means that engages with the second pushing member and interlocks the compression operation of the presser plate and the pushing operation of the side surface portion of the container body by the second pushing member to bend the bottom plate portion folding position simultaneously with the compression. When,
The first pushing member guiding means and the second pushing member guiding means separate the first pushing member and the second pushing member in the middle of bending the top plate portion folding position and the bottom plate portion folding position of the front and rear side portions of the container body portion. And a rectangular container folding device , wherein the first pushing member and the second pushing member are automatically released from the front and rear side surfaces of the container body .   The fold line forming means for forming a volume reduction induction fold line by pushing each of the four corners of the left and right side portions of the body into the container before the folding operation is provided. Folding device for square container. The folding device for a rectangular container according to claim 2 , wherein the folding line forming means is configured such that the pushed-in state is locked in the initial folding stage, and the lock is automatically released in the middle of folding. Biased in a direction to separate the pressing plate from Taiban any one of claims 1 to 3, characterized in that it comprises a self-supporting means for holding the state of being separated a presser plate against Taiban in a free state The folding apparatus of the square container as described in the term of above. The apparatus for folding a rectangular container according to any one of claims 1 to 4 , wherein the compression means includes a winch mechanism. 6. The rectangular container folding device according to claim 5 , wherein the compression means includes an operation lever that winds up the winch mechanism by lever action. Compression means, a winch mechanism, comprising an operating lever to wind the winch mechanism by the lever action, fold line forming means to claim 2 or 3 has a configuration to operate using the operating lever for operating the winch mechanism The folding device of the square container as described. The body part of the rectangular container is provided with a crease guiding part that becomes a crease when folded, and the end of the crease guiding part provided toward the corners of the left and right side parts is located in front of the corner part to form a crease. The folding device for a rectangular container according to claim 2 , wherein the fold guide portion and the corner portion are connected by a volume-reducing fold line formed by the means.

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