KR102211493B1 - Compression apparatus for corrugated board - Google Patents

Abstract

The present invention relates to a compression apparatus for a corrugated board for a packing box, which comprises: a table; a transfer unit which is placed on the table to transfer the corrugated board, which is unfolded and put across the table, toward a rear side; an alignment guide unit placed in front of an upper side of the transfer unit to align the stacked corrugated boards and to guide the aligned corrugated boards to be successively transferred one by one from the lowest one upward; and a compression unit placed on a lower side of the table to compress the corrugated boards folded to come in contact with each other at corresponding parts bonded with a bonding unit formed on one side end of the corrugated boards. The present invention is able to greatly improve the bonding performance between an adhesive unit and the corresponding bonding part after an adhesive is applied.

Description

Corrugated cardboard compression device for packaging boxes{COMPRESSION APPARATUS FOR CORRUGATED BOARD}

The present invention relates to a compression apparatus for corrugated cardboard for packaging boxes, which significantly improves mutual adhesion performance by applying an adhesive to a joint portion of a corrugated cardboard for a packaging box, and then moving the joint and a portion to be adhered thereto in a state where they are pressed together. .

The packaging box is used for various purposes in various fields, and is used for packaging, transport, and storage of general goods.

Such a packaging box is usually completed into a packaging box through manual bonding and banding by an operator in a state in which an adhesive layer is formed on one end of the cut cardboard after cutting a site made of cardboard.

An adhesive applicator is used as a device for completing the packaging box as described above, and the adhesive applicator has a worktable that can fold and attach the corrugated cardboard discharged by applying the adhesive while applying the adhesive to the cut cardboard. It has a structure that can more conveniently complete the packaging box.

As a technology related to such an adhesive application device,

Republic of Korea Utility Model Registration No. 20-0418636 (registered on June 7, 2006, hereinafter referred to as'document 1') 『Adhesive application device for corrugated cardboard cut for packaging box』 is presented.

Document 1 includes a supply roller in which an elastic rubber band is wound in a spiral shape on an outer circumferential surface, and a pressure transfer roller is formed on one side of the supply roller to press the adhesive portions of both ends of the corrugated cardboard, and an adhesive coating roller and an adhesive application roller on one side of the pressure transfer roller Each discharge belt is formed, but a pressurizing elastic band is placed downward on the upper side of the discharge belt and one side of the application roller, respectively, so that the supply of corrugated cardboard is uniformly and stably guided by the excellent frictional force of the rotating rubber band. By pressurizing and compressing the corrugated cardboard adhesive part, it induces the loading height evenly, and it is cut for a packaging box that can obtain excellent economic efficiency and stable productivity through the simplification of the discharge and adhesion path by the pressurized elastic band and rational improvement of the structure. It is a technology related to an adhesive application device for corrugated board.

Literature 1. Korean Utility Model Registration No. 20-0418636 (Registered 2006.06.07.)

The present invention takes a lot of work time as the worker folds and attaches the corrugated cardboard on the workbench, so that it takes a lot of work time and transfers it while compressing using a crimping device immediately after applying the adhesive in order to escape from the existing adhesive application device, which is also inferior in work efficiency. It is an object of the present invention to provide an apparatus for compressing corrugated cardboard for a packaging box so that it can be cured while staying in the container for a certain period of time to increase bonding performance between them.

In order to solve the above problems, the apparatus for compressing corrugated cardboard for a packaging box according to the present invention,

table;

A transfer unit disposed on the top of the table and configured to transfer the corrugated cardboard that is spread and placed across the table to the rear;

An alignment guide unit disposed in front of the transfer unit and for guiding the stacked corrugated cardboards to be aligned and sequentially transferred from the lowermost corrugated cardboard to the aligned corrugated cardboard; And

delete

A pressing unit disposed under the table and configured to press the folded corrugated cardboard so that a bonding portion formed at one end of the corrugated cardboard and a corresponding portion bonded to each other contact each other;

It characterized in that it is made of.

Corrugated cardboard compression apparatus for a packaging box according to the present invention,

It has the greatest effect of significantly improving the bonding performance between the bonding portion and the bonding portion thereof by compressing the bonding portion after applying the adhesive.

In addition, it is possible to produce good-quality corrugated cardboard by further providing a single sheet input function of corrugated cardboard, an alignment function of the stacked corrugated cardboard, a corrugated board support function when applying an adhesive, and a support function to increase the compression performance when crimping.

1 is a side configuration diagram showing a compression apparatus for a corrugated cardboard for a packaging box according to the present invention,
Figure 2 is a plan configuration diagram of Figure 1,
Figure 3 is a plan configuration diagram for showing the arrangement and transfer process of the corrugated cardboard in Figure 1,
4 and 5 are some side and plan configuration diagrams for showing the alignment guide unit,
6 and 7 are partial side views for showing the support unit,
8 to 10 are partial side and plan configuration diagrams for showing the pressing unit,
11 is a plan configuration diagram showing a state in which an adhesive is applied to a joint portion of a corrugated cardboard and a corrugated board that has been expanded
12 is a plan configuration diagram showing a process in which the corrugated cardboard coated with the adhesive is folded before being put into the pressing unit;
13 and 14 are partial side configuration views for showing a pressing roller, a support bracket, and a return spring of the pressing unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical ideas of the present invention, and various equivalents that can replace them at the time of the present application It should be understood that there may be water and variations.

Referring to Fig. 1, the front conveyor belt side is designated as front or front, and the rear conveyor belt side is designated as rear or rear.

In addition, the corrugated cardboard 1 to be referred to in the present invention is a structure having four surfaces connected in a line, as shown in FIG. 11, and a joint portion 1a protruding downward is formed on the lowermost side surface.

As shown in Figures 1 to 14, the apparatus for compressing corrugated cardboard for a packaging box according to the present invention,

It is largely composed of a table 10, a transfer unit 20, an alignment guide unit 30, a coating unit 40, and a pressing unit 50.

Looking at each configuration,

Table 10

1 to 3,

It is composed of a structure having a three-dimensional structure by a number of frames.

At this time, it is desirable to properly arrange a panel or the like to provide a space where the corrugated board is placed.

And as shown in Figs. 1 and 2, the table 10 further includes a housing 13 covering the front side configuration of the bottom conveyor belt 51 and the middle conveyor belt 52 of the pressing unit 50 to be described later. It is provided, and it is preferable that the front portion of the housing 13 is opened in order to discharge the corrugated cardboard 1 that has passed through the pressing unit 50.

The upper surface of the housing 13 can also be used as a space in which a worker can stand, which is a work of stacking and inserting corrugated cardboard 1 on the side of the transfer unit 20, and corrugated cardboard ( 1) Helps the operator to easily perform the operation of manipulating the alignment guide unit 30 to align.

In addition, a temporary holder 14 may be provided so that the discharged corrugated cardboard 1 can be temporarily mounted.

And as shown in Figs. 1 and 2, the table 10 is further provided with a counting sensor 15 installed to be disposed on the rear side of the coating unit 40, the counting sensor 15 is the coating unit ( When the corrugated cardboard 1 on which the adhesive has been applied by 40) is transferred by the transfer unit 20, the transfer quantity is checked and transmitted to the controller. A separate display can be provided on the controller so that the transfer quantity can be displayed as a number.

The transfer unit 20

1 and 2,

It is disposed on the upper portion of the table 10 and is to be transferred to the rear of the corrugated cardboard 1 which is unfolded and placed across,

A front conveyor belt (21) and a rear conveyor belt (22) arranged side by side in the front and rear sides,

Transfer drive means (23) for transmitting rotational power to the front conveyor belt (21) and the rear conveyor belt (22), and

Each front belt 211 and rear belt 221 of the front conveyor belt 21 and the rear conveyor belt 22 are in the longitudinal direction of each axis of the front conveyor belt 21 and the rear conveyor belt 22. Each of the front belts 211 displaced by sliding along the longitudinal direction of each axis of the front conveyor belt 21 and the rear conveyor belt 22 in a state in which a plurality of the front conveyor belts 21 and the rear conveyor belt 22 are disposed at a predetermined interval, and Holding means (24) for fixing the position of the rear belt (221)

It is made including.

Here, as shown in FIGS. 2 and 3, a plurality of front belts 211 and rear belts 221 are provided and are wound around the shafts of the conveyor belts 21 and 22 at regular intervals left and right. Since these belts 211 and 221 must be able to change their position according to the size of the corrugated cardboard 1 to be input, the holding means 24 is provided in the present invention.

1 to 3, the holding means 24 includes a circular holding bar 241 disposed to pass horizontally on the top of the table 10, and slidably fitted to the holding bar 241. A plurality of holding bodies 242, a holding fastening part 243 that is fastened to each of the holding bodies 242 so that an end presses the holding bar 241 when tightened, and an upper side of the holding body 242 It consists of a holding post 244 which is connected to and erected vertically.

Eventually, after the holding fastener 243 is released, the position of the holding body 242 is set along the holding bar 241, and when the setting is completed, the holding fastener 243 is tightened to the holding bar 241 ) To fix the holding body 242.

Therefore, the holding post 244 connected to the upper side of the holding body 242 is disposed adjacent to the side ends of the belts 211 and 221, and the belts 211 and 221 are By making it possible to support both sides, it is possible to prevent the belt from coming off when the belt is driven.

And as in Figure 1, the transfer drive means 23 is

Having a pair of first and second transport driven sprockets coupled to the shaft of the front conveyor belt 21, a third transport driven sprocket coupled to the shaft of the rear conveyor belt 22, and a first driving sprocket. Consists of a transfer drive motor, a first relay belt interconnecting the first drive sprocket and the first transfer driven sprocket, and a second relay belt interconnecting the second transfer driven sprocket and the third transfer driven sprocket .

The transfer drive means 23 made of the above configuration is an example, and satisfies the condition of allowing the front conveyor belt 21 and the rear conveyor belt 22 to rotate in the same direction using one or two drive sources. Various modifications and changes will be possible within the range.

The alignment guide unit 30

1 to 5,

Arranged in front of the top of the transfer unit 20, to align the stacked corrugated cardboard (1) and to guide to sequentially transfer sheet by sheet from the bottom corrugated cardboard (1) in the aligned corrugated cardboard (1),

Front alignment means 31 for supporting the front surface of the corrugated cardboard 1 disposed on the front side of the table 10 and placed on the front conveyor belt 21,

Side alignment means 32 for supporting both sides of the corrugated cardboard 1 disposed on both sides of the table 10, and

Rear alignment means (33) installed on the horizontal frame (12) of the table (10) to support the rear surface of the corrugated board (1)

It is made including.

Here, as in Figs. 4 and 5, the front alignment means 31

A front bar 311 installed laterally on the table 10,

A plurality of front bodies 312 disposed to be slid on the front bar 311 along the longitudinal direction thereof,

An operation bar 313 inserted through the front body 312 to pass through,

A front plate 314 coupled to the rear end of the operation bar 313,

A first front tightening portion 315 that slides along the front bar 311 and is fastened to the front body 312 positioned at a position so that an end presses the front bar 311 when tightened,

A second front tightening part 316 that is fastened to the front body 312 to fix the control bar 313 positioned by sliding back and forth from the front body 312 and pressurizes the control bar 313 at an end thereof. )

It is made including.

As a result, the front plate 314 is capable of adjusting the position to the side and the angle to the front and rear.

And as in Figures 4 and 5, the side alignment means 32

A side rod 321 installed on the lateral frame 12 of the table 10 to be disposed on both sides of the table 10 and movably installed along the lateral frame 12,

A side plate 322 into which an end of the side rod 321 is inserted,

Side tightening portion 323 that is fastened to the side plate 322 so that an end of the side rod 321 presses the side rod 321 when tightened

Consists of

As a result, the side plate 322 is capable of adjusting the position in the lateral and forward and backward directions.

And as in Figures 4 and 5, the rear alignment means 33

A plurality of rear rods 331 installed on the lateral frame 12 of the table 10,

A rear plate 332 erected to be disposed in contact with the front end of the rear rod 331,

A rear tightening part 333 fastened to the rear rod 331 past the upper end of the rear plate 332

Consists of

At this time, when the rear clamping part 333 is tightened, the rear plate 332 is non-rotated while being supported on the front end of the rear rod 331 and can be moved downward, Up and down position adjustment is possible.

Here, each of the rear rods 331 includes a rear bar 334 separately installed on the horizontal frame 12, and a rear clamp 335 having a structure that surrounds the rear bar 334 but is opened or closed by a hinge. , By sliding along the rear bar 334 while the clamp tightening portion 336 for fixing the closed rear clamp 335 is provided, it is possible to adjust the position to the side.

The application unit 40

As shown in FIGS. 1 to 3 and 8 to 10,

To apply an adhesive to the lower surface of the junction (1a) formed at one end of the cardboard (1) transported by the transfer unit (20),

A bucket 41 installed on one side of the table 10 and receiving an adhesive to open the top thereof,

An application roller 42 disposed to rotate inside the bucket 41,

A guide roller 43 disposed on the upper side so as to mutually engage with the coating roller 42, and

A relay bracket 44 that is inserted so that both ends of the shaft of the guide roller 43 are rotated, has a long hole 441 vertically and is connected to the lateral frame 12 installed on the table 10

It is made including.

Here, a separate supply device capable of automatically supplying an adhesive to the bucket 41 may be provided and connected.

In addition, the coating roller 42 is automatically rotated as it comes into contact with the joint portion 1a of the corrugated cardboard 1 to be conveyed, and may be implemented to rotate forcibly by providing additional power.

And, as shown in FIG. 8, the guide roller 43 has an H-shaped roller structure when viewed from the front, and an inner groove formed along the outer periphery is engaged with the coating roller 42. When entering the junction (1a) of the corrugated cardboard (1) in such a mutually engaged state, the guide roller 43 is pushed and raised, and the weight of the guide roller 43 or the length of the guide roller 43 Accordingly, the adhesive is applied in a state in which the bonding portion 1a of the corrugated cardboard 1 is in close contact without being lifted from the coating roller 42.

Eventually, the bonding portion (1a) of the corrugated cardboard (1) transferred by the transfer unit (20) passes between the coating roller (42) and the guide roller (43), and at this time, the coating roller (42) in which the adhesive is buried on the outer periphery As is rotated, it is applied along the lower surface of the junction (1a) of the cardboard (1).

The corrugated cardboard 1 discharged by applying the adhesive in this way is manually folded by an operator and put into the pressing unit 50 side. In other words, the joint 1a formed at one end of the corrugated cardboard 1 and the corresponding parts that are joined to each other are folded by the operator's manual so that the corresponding parts are in contact with each other and then injected into the pressing unit 50 side.

The crimping unit 50

1 to 3, 13 and 14,

It is disposed under the table 10, for compressing the folded cardboard 1 so that the junction 1a of the cardboard 1 in the cardboard 1 and the corresponding portions bonded to each other contact each other,

The bottom conveyor belt 51 for transferring the folded corrugated cardboard 1 so that the junction part 1a and the corresponding part abut each other from the lower rear of the table 10 to the front,

A corrugated cardboard (1) that is disposed on the upper side of the bottom conveyor belt (51), wherein the middle belt (521) is disposed to face each other with the bottom belt (511) of the bottom conveyor belt (51), is the bottom belt (511) And a middle conveyor belt 52 to be transferred between them by the middle belt 521,

When viewed from the side, a compression driving means for transmitting power so that the bottom belt 511 and the middle belt 521 of the bottom conveyor belt 51 and the middle conveyor belt 52 rotate clockwise and counterclockwise ( 53), and

The middle belt 521 of the middle conveyor belt 52 is rotated by a middle belt 521 that is disposed at a predetermined interval in the front and rear and rotated, and is transferred between the bottom belt 511 and the middle belt 521. A plurality of pressing rollers 54 to pressurize the corrugated board (1)

It is made including.

Here, the bottom conveyor belt 51 and the middle conveyor belt 52 have a conveyor belt structure in which a pair of shafts are rotated on both sides of the lower part of the table 10 and a belt is wound around the shaft.

And as in Figure 1, the compression driving means 53

A first driven sprocket 531 coupled to the shaft of the bottom conveyor belt 51,

A first compression drive motor 533 having a first drive sprocket 532,

A first compression drive belt 534 interconnecting the first driven sprocket 531 and the first driving sprocket 532,

A second driven sprocket 535 coupled to the shaft of the middle conveyor belt 52,

A second compression drive motor 537 having a second drive sprocket 536,

A second compression drive belt 538 interconnecting the second driven sprocket 535 and the second driving sprocket 536

Consists of

As a result, the bottom belt 511 and the middle belt 521 are rotated by the respective compression drive motors 533 and 537.

The compression driving means 53 made of the above configuration is an example, and within a range that satisfies the conditions for allowing each of the bottom conveyor belt 51 and the middle conveyor belt 52 to rotate counterclockwise and clockwise. Various modifications and changes will be possible.

And as shown in Figs. 13 and 14, each of the pressing rollers 54

A shaft 541 whose both ends are rotatably coupled to side frames 11 disposed on both sides of the lower side of the table 10 so as to be rotated,

In a state where the rear end is axially coupled to the shaft 541 and a pair of roller brackets 542 are provided at the front end to accommodate rotation of both ends of the pressing roller 54

It is rotated upward with respect to the shaft 541 by the entered folded corrugated cardboard 1 and presses the corrugated cardboard 1 by its own weight.

Eventually, each of the pressing rollers 54 can rotate up and down based on the shaft 541, and is rotated upward by the corrugated cardboard 1 transferred to the lower side, and at this time, the corrugated cardboard 1 is pressed by its own weight. When the cardboard (1) passes, it is returned to its original position by its own weight. That is, it rotates downward and returns.

Each of the pressing rollers 54 preferably has an appropriate weight so that the adhesive applied to the joint portion 1a of the corrugated board 1 is cured and adhered to the corresponding area, but if it is too heavy, the corrugated board 1 Since the internal structure of) may be damaged or deformed, it is desirable to have a weight such that adhesion can be easily achieved while minimizing deformation of the corrugated board (1).

13 and 14, the shaft disposed in the rear inner region of the middle belt 521 of the middle conveyor belt 52 is attached to the lifting guide 551 formed on the support bracket 55 to which both ends thereof are rotated. It is possible to move up and down.

On the inner wall of the support bracket 55, the lifting guide 551, which is opened inward while penetrating up and down, is formed, and the shaft of the middle conveyor belt 52 is inserted into the lifting guide 551 to vertically It can be elevated to.

Eventually, the axis of the middle conveyor belt 52 is raised by being pushed by the corrugated cardboard 1 entering.

At this time, the axis of the raised middle conveyor belt 52 is engaged with it, but the return roller 56 is disposed in a form supporting the upper surface of the middle belt 521, and the elasticity that pulls the return roller 56 downward. It is returned to its original position by the spring 57.

In other words, when the shaft of the raised middle conveyor belt 52 passes through the corrugated cardboard 1, the return roller 56 is pulled downward by the elastic restoring force of the elastic spring 57, and at this time, the middle belt ( As 521 is pressed, the axis of the middle conveyor belt 52 also descends along the elevating guide 551.

Therefore, as in FIG. 11, the corrugated cardboard 1 to which the adhesive is applied by the application unit 40 is

As shown in [A] of Fig. 12, the four faces of the joint 1a side are folded and stacked,

As shown in [B] of FIG. 12, of the four face portions, the face portion located at the opposite end of the joint portion 1a is folded and overlapped.

Corrugated cardboard 1 folded in this way is easily bonded to each other between the bonding portion 1a and the corresponding portion through compression by the compression unit 50.

On the other hand, the apparatus for compressing corrugated cardboard for a packaging box according to the present invention further includes a support unit 60,

The support unit 60 is

6, 7 and 10,

When the adhesive is applied to the lower surface of the joint (1a) of the corrugated board (1) by the application unit (40),

A plurality of support brackets 61 installed at regular intervals on the transverse frame 12 of the table 10,

A support pin 62 that is inserted into a hole penetrating the upper and lower sides of the support bracket 61 to be elevated

The lifting bracket 63 hinged to the support pin 62 and disposed on the upper side of the rear conveyor belt 22, and

A plurality of support rollers 64 coupled to the lifting bracket 63 so as to be rotatable at a predetermined interval back and forth

It is made including.

Eventually, when entering the corrugated cardboard 1, the support roller 64 is pushed by this, and as a result, the support pin 62 rises upward in the hole of the support bracket 61, and the upper part of the corrugated cardboard 1 Will support the side.

In particular, it is preferable that each of the support rollers 64 are arranged side by side with the application unit 40, which can prevent the corrugated cardboard 1 from floating when the adhesive is applied by the application unit 40.

In addition, each of the support brackets 61 may be positioned in the longitudinal direction of the lateral frame 12 of the table 10, and may be implemented to be fixed and released with bolts or the like after such position adjustment.

Further, each of the support rollers 64 is preferably disposed on the upper side of each rear belt 221 of the rear conveyor belt 22, which is between each rear belt 221 and each of the support rollers 64. It is to support the corrugated cardboard (1) by each support roller (64).

In the above description of the present invention, with reference to the accompanying drawings, it has been mainly described a "pressing device for corrugated cardboard for a packaging box", but the present invention can be variously modified and changed by those skilled in the art. Changes should be construed as belonging to the scope of the present invention.

1: corrugated cardboard
1a: junction
10: table
11: side frame
12: horizontal frame
13: housing
14: Temporary cradle
15: Counting sensor
20: transfer unit
21: Front conveyor belt
211: front belt
22: rear conveyor belt
221: rear belt
23: transfer drive means
24: holding means
241: holding bar
242: holding body
243: holding fastener
244: holding post
30: alignment guide unit
31: front alignment means
311: front bar
312: front body
313: control bar
314: front plate
315: first front clamping part
316: second front fastener
32: side alignment means
321: side rod
322: side plate
323: side fastener
33: rear alignment means
331: rear road
332: rear plate
333: rear fastener
334: rear bar
335: rear clamp
336: clamp tightening part
40: application unit
41: bucket
42: coating roller
43: guide roller
44: relay bracket
441: long ball
50: compression unit
51: bottom conveyor belt
511: bottom belt
52: Middle conveyor belt
521: middle belt
53: compression drive means
54: pressing roller
541: shaft
542: roller bracket
55: support bracket
551: lifting guide
56: return roller
57: return spring
60: support unit
61: Support bracket
62: support pin
63: lifting bracket
64: support roller

Claims (1)

Table 10;
A transfer unit 20 disposed above the table 10 and configured to transfer the corrugated cardboard 1 which is spread and placed across the table 10 to the rear;
An alignment guide unit 30 arranged in front of the upper front of the transfer unit 20 and for guiding the stacked corrugated cardboard 1 to be aligned and sequentially transferred from the corrugated cardboard 1 at the bottom of the aligned corrugated cardboard 1 ); And
A compression unit for compressing the corrugated cardboard 1, which is disposed under the table 10, and folded by the operator's manual labor so that the bonding portion 1a formed at one end of the corrugated cardboard 1 and the corresponding portions bonded to each other contact each other ( 50);
Is made of,
The crimping unit 50 includes a bottom conveyor belt 51 for transporting the folded corrugated cardboard 1 from the lower rear of the table 10 to the front, so that the bonding portion 1a and the corresponding portion contact each other, and the bottom conveyor belt ( 51) Doedoe disposed on the upper side, the middle belt 521 is disposed so as to face each other with the bottom belt 511 of the bottom conveyor belt 51 so that the folded cardboard 1 is formed of the bottom belt 511 and the middle belt 521 ), the middle conveyor belt 52 to be transported between them, and each bottom belt 511 and middle belt 521 of the bottom conveyor belt 51 and the middle conveyor belt 52 when viewed from the side The compression drive means 53 for transmitting power to rotate clockwise and counterclockwise, and the middle belt 521 disposed at a predetermined interval in the middle belt 521 of the middle conveyor belt 52 and rotated. Consists of a plurality of pressing rollers 54 that press the folded corrugated cardboard 1 transferred between the bottom belt 511 and the middle belt 521 while being rotated by,
Each of the pressing rollers 54 has a shaft 541 whose both ends are rotatably coupled to side frames 11 disposed on both sides of the lower side of the table 10, and a rear end thereof is axially coupled to the shaft 541, and It is rotated upward with respect to the shaft 541 by the folded corrugated cardboard 1 entered in a state where both ends of the compression roller 54 are provided with a pair of roller brackets 542 to be accommodated to rotate at the end thereof, Corrugated cardboard (1) is pressed,
The shaft disposed in the rear inner region of the middle belt 521 of the middle conveyor belt 52 can be lifted up and down by an elevating guide 551 formed on a support bracket 55 to which both ends thereof are rotated,
The shaft of the middle conveyor belt 52 raised by the entering corrugated cardboard 1 is engaged with it, but the return roller 56 and the return roller 56 are arranged to support the upper surface of the middle belt 521 Corrugated cardboard compression apparatus for a packaging box, characterized in that it is returned to its original position by an elastic spring (57) that pulls downward.

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