JP2007030176A - Folding apparatus of corrugated cardboard sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the folding apparatus of a corrugated cardboard sheet capable of accurately and smoothly folding both side parts of the corrugated cardboard sheet downward from a ruling part without causing shift or strain when the corrugated cardboard sheet, to which ruling processing and slot processing are applied, is folded from the ruling parts on both sides of the corrugated cardboard sheet to make a case. <P>SOLUTION: Rod-like members 2A suspended and curved downward in an arcuate state from both front and rear ends thereof are arranged above both side parts of the corrugated cardboard sheet 10 in a state that both side rulings 11 and 11 are supported on the edge parts of both side edge frames 1 and 1 to up and down move the central parts of the rod-like members 2A by a drive means 9. Both side parts of the corrugated cardboard sheet 10 passing under the rod-like members 2A by the down movement of the rod-like members 2A to fold the corrugated cardboard sheet 10 downward accurately and smoothly from both side ruling 11 and 11 centering the edge parts of both side edge frames 1 and 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a corrugated box making machine that bends both sides of a corrugated cardboard sheet that has been subjected to ruled lines and slot processing, etc., at a substantially right angle downward from the ruled line portions.

  As shown in FIG. 9, the corrugated box making machine includes a supply mechanism 20 for the corrugated cardboard sheet 10 before processing, a printing device 21 that performs printing at an appropriate position of the corrugated cardboard sheet 10, and a ruled line processing machine that performs ruled line processing on the corrugated cardboard sheet 10. 22, a slot processing machine 23 for performing slot processing, a gluing roll unit 24, a folding device 25, and a folding device 26 are sequentially disposed, and a flat rectangular corrugated cardboard sheet 10 is provided in the supply mechanism 20. However, a large number of layers are stacked with the length direction thereof being perpendicular to the conveying direction, and are sequentially fed out one by one from the lower end opening of the supply mechanism 20 by a conveying belt and a roller. It is conveyed toward the folding device 26 by the conveying means.

  First, after the predetermined printing is performed on the corrugated cardboard sheet 10 by the printing device 21, the ruled line 11 and the slot for folding and forming the trunk portion and the flap of the corrugated cardboard case by the ruled line processing machine 22 and the slot processing machine 23. 10 is processed as shown in FIG. 10, and the glue margin piece at one end is glued by the glue roll part 24, and then both sides of the corrugated cardboard sheet 10 are creased on both sides by the folding device 25. The two side ends overlapped with each other through the glue piece are integrally bonded together by being folded by about 90 degrees downward from the upper side and further folded inward by the folding device 26.

  In the corrugated box making machine configured as described above, the device 25 for bending both side portions of the corrugated cardboard sheet 10 downward is a guide bar as described in FIGS. 2 'is adopted. The guide bar 2 'is made of a synthetic resin rod-like member, and the guide bars 2' and 2 'are arranged on both sides of the conveying means 9 including a conveying belt or the like from the start end side of the folding device 25 to the end portion of the folding device 26. Are arranged on the outer sides of the edge frames 1 ′ and 1 ′, respectively, along one end thereof on the machine frame on the gluing roll unit 24 side and on the other end on the terminal side of the folding device 26. As a structure that is supported by the machine frame and that the part from the start end side of the folding device 25 to the end portion of the folding device 25 is suspended in a state of being bent in a gentle arc from the upper side to the lower side of the edge frame 1 ′. Yes.

  Then, in advance, both side edge frames 1 ′, 1 ′ so that the edge part formed by the outer edge of both side edge frames 1 ′, 1 ′ supports the lower surface of both side ruled lines 11, 11 of cardboard sheet 10. Adjust the position. When the corrugated sheet 10 formed with the ruled lines 11 and the slots 12 is fed into the folding device 25 configured in this manner by the ruled line processing machine 22 and the slot processing machine 23, the feeding direction of the corrugated cardboard sheet 10 is set to the front side. The front end surfaces of the both side portions correspond to the upper surface height position of the edge frame 1 ′ in the guide bar 2 ′ that is gradually inclined downward from the upper side toward the front side on the outer side of the edge frame 1 ′. After contacting the part, the both sides of the corrugated cardboard sheet 10 gradually move downward with the edge frame 1 'as a fulcrum by the inclined part of the guide bar 2' inclined downward from the position toward the front. It can be bent.

As the folding proceeds, both side portions of the cardboard sheet 10 move to the inside of the inclined portion of the guide bar 2 ′, and when the cardboard sheet 10 enters the guide bar 2 ′ across the front and rear end surfaces, both side portions thereof are moved. The guide bars 2 'and 2' are in slidable contact with the outer surface of the surface, and these guide bars 2 'and 2' maintain a state in which both sides are refracted downward from both sides of the ruled lines 11 and 11 at approximately 90 degrees. In this way, it is fed into the folding device 26 and is further gradually folded inward by the folding device 26 as described above.
JP 2001-121624 A

  However, in the bending apparatus 25 as described above, the guide bar 2 ′ is held in a suspended state that gently curves in an arc shape from the upper side to the lower side of the edge frame 1 ′ on the outer side of the edge frame 1 ′. Therefore, the corrugated cardboard sheet 10 conveyed to the folding device 25 by the conveying means 9 is, as described above, first, the front flaps on the both side portions projecting horizontally from the guide bars 2 ′, 2 ′ on both sides. After the front end surface of the guide bar 2 ', 2' is abutted against the guide bar 2 ', the front end surface is gently refracted downward along the guide bar 2' which is gently inclined downward as it is conveyed forward. 'Will pass through.

  At this time, when the front end surfaces of the both side portions of the corrugated cardboard sheet 10 abut against the guide bars 2 ′ and 2 ′, a force is applied to stop the conveyance by the conveying means 9, and the corrugated cardboard sheet 10 is Even if it is sandwiched, the position of both side ruled lines 11, 11 of the corrugated cardboard sheet 10 with respect to the edge part of the edge frame 1 ′, 1 ′ is displaced due to the left and right direction against the clamping force, and the ruled line 11, It becomes impossible to bend both sides of the corrugated cardboard sheet 10 accurately from the eleventh part. If the holding force of the corrugated cardboard sheet 10 by the conveying means 9 is increased, the corrugated cardboard sheet 10 may be damaged when the front end surface of the corrugated cardboard sheet abuts against the guide bar 2 ′.

  Further, the front end surfaces of both sides of the corrugated cardboard sheet 10 move forward from the guide bars 2 'and 2', and both side parts of the corrugated cardboard sheet 10 gradually inward by the guide bars 2 'and 2' from the front end to the rear end. First, the front flap is bent downward from the slot 12 on the inside, and the bending force acts on the inner corner of the continuous portion of the slot 12 and the ruled line 11, and the acting force is corrugated cardboard. This acts as a force to bend the sheet 10 from the inner corner to the rear rather than the force to bend the both sides of the sheet 10 downward from the ruled line 11 portion. Usually, the edge portion of the edge frame 1 'is positioned so as to be slightly parallel to the inner side of the ruled line 11 on both sides of the corrugated cardboard sheet 10, so that both side parts of the corrugated cardboard sheet 10 are as shown in FIG. In addition, it is bent from the portion shifted inward from the ruled line 11 and the entire side portions are distorted, and when it is folded, there is a problem that accurate bonding and bonding cannot be performed.

  The present invention has been made in view of such problems, and the object of the present invention is to simultaneously and intensively cover the entire length of the ruled line when folding both side parts of the corrugated cardboard sheet downward from the both side ruled line portions. Accordingly, it is an object of the present invention to provide a corrugated sheet folding apparatus that can accurately and smoothly bend both side portions of the corrugated sheet by applying a uniform downward bending force.

  In order to achieve the above object, a cardboard sheet folding apparatus according to the present invention is characterized in that, as described in claim 1, the cardboard sheet subjected to ruled lines and slot processing is conveyed on both sides of the cardboard sheet while being conveyed by the conveying means. And an edge frame for supporting the lower surface of the both side ruled line portions of the corrugated cardboard sheet on both sides of the conveying means. A folding member is disposed on the outer side of the frame so as to move downward from above the corrugated cardboard sheet when the corrugated cardboard sheet passes and bend the both side parts of the corrugated cardboard sheet downward from the ruled line part with the edge part of the edge frame as a fulcrum. It is characterized by being.

  As the bending member, as described in claim 2, it is composed of a flexible synthetic resin rod-like member that is curved in a downward arc shape disposed along the outer side of both side edge frames, Both end portions are supported by a support frame disposed above the edge frame, and the lower end of a connecting rod is connected to the central portion, and the connecting rod is installed by driving means installed on the supporting frame. It is configured to move up and down to move the central portion of the rod-shaped member in the vertical direction on the outer side of the upper surface of the edge frame.

  The invention according to claim 3 is a bending member having another structure, and is perpendicular to the eccentric shaft that is rotated by the rotation driving means installed on the support frame disposed above the both-side edge frames. It is configured to bend both sides of the cardboard sheet downward by rotating the convex surface of the cam-shaped member from the upper side of the edge frame to the lower side in the conveying direction of the cardboard sheet. ing.

  When the corrugated sheet is passed to the outside of the edge frame arranged on both sides of the conveying means, the corrugated sheet is moved downward from above to the both sides of the corrugated sheet with the edge of the edge frame as a fulcrum. Since a folding member that bends downward from the ruled line portion is provided, the folding member waits above the conveyance path of the cardboard sheet until the cardboard sheet is conveyed below the folding member. When the cardboard sheet passes below the bending member, the cardboard sheet moves down in synchronization with the passage and pushes down the upper surfaces of both sides of the cardboard sheet. The edge frame is made to act intensively and uniformly over the entire length of both side ruled lines supported by the edge frame. The edge portion can be bent accurately and smoothly from the ruled line portion as a fulcrum.

  Therefore, when the corrugated cardboard sheet folded at about 90 degrees downward on both sides as described above is continuously carried from the folding device to the next folding device, the folded portion is folded when the folding device starts folding. Thus, it can be accurately folded from the ruled line, and a highly accurate cardboard case can be manufactured.

  In the above bending apparatus, the invention according to claim 2 is formed by a flexible synthetic resin rod-like member that is bent in a downward arc shape disposed along the outer side of both side edge frames. Both ends of the connecting frame are supported by the support frame disposed above the edge frame, and the lower end of the connecting rod is connected to the central portion, and the driving means is installed on the supporting frame. Since the central part of the bar-shaped member is moved up and down by the upper and lower sides of the edge frame on the upper side of the edge frame, when the both sides of the corrugated cardboard sheet pass below the bending member, the driving means When the bar-shaped member is lowered by operating the bar-shaped member, the central portion of the bar-shaped member presses against the predetermined portions on both sides of the corrugated cardboard sheet over its entire length, and the load is applied to the corrugated cardboard sheet. Of both sides uniformly acts on the overall downward load, can be folded quickly and accurately downward from both sides border portion thereof both sides as a fulcrum an edge portion of the edge frame.

  Further, when both sides of the corrugated cardboard sheet are bent downward, the rod-like member is immediately and continuously raised from the lowering operation while being in sliding contact with the outer side surfaces of both sides of the corrugated cardboard sheet. Then, the drive means is operated in synchronization with the conveying speed of the corrugated cardboard sheet conveyed at regular intervals, so that both side portions of the corrugated cardboard sheet can be bent sequentially, intermittently and accurately.

  According to a third aspect of the present invention, the bending member rotates in a vertical direction around an eccentric shaft that is rotated by a rotation driving means disposed on a support frame disposed above the both-side edge frames. Since the convex surface of the cam-shaped member is configured to rotate in the conveying direction of the corrugated cardboard sheet from the upper side to the lower side of the edge frame, the cam-shaped member is formed on the center part on both sides of the corrugated cardboard sheet. The cam-like member can be turned downward while pressing the convex surface of the cam-like member so that both sides of the cardboard sheet can be quickly and accurately bent downward from the ruled line portion. Since the convex surface of the member rotates in the conveying direction in synchronization with the conveying speed of the corrugated sheet, a force that resists the conveying direction is exerted on both sides of the corrugated sheet. Without Ku action, it is possible to act only force to bend downward.

  Accordingly, the cardboard sheet can be bent smoothly and accurately without causing any deviation or distortion, and the cam-like member is rotated according to the conveyance speed of the cardboard sheet at regular intervals. It is possible to continuously supply both sides of the conveyed corrugated cardboard sheet to the next folding device side while sequentially bending the cardboard sheets efficiently.

  Next, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a simplified side view of a folding device A part in a box making machine, and FIG. 2 is a simplified front view thereof. 9 is disposed between the gluing roll portion 24 and the folding device 26 in the box making machine shown in FIG. 9, and the ruled line processing machine 22 and the slot processing machine 23 have the ruled line 11 and the predetermined part as shown in FIG. After the slot 12 is provided, along the both sides of the conveying means 9 for conveying the corrugated cardboard sheet 10 having a glue layer on one end by the gluing roll unit 24 from the gluing roll unit 24 to the conveying terminal side of the folding device 26 The edge frames 1 and 1 arranged in parallel with each other, and both sides of the corrugated cardboard sheet 10 at the upper ends of the edge frames 1 and 1 move downward in the vertical direction on the outer sides of the edge frames 1 and 1 and move downward. Edge portion 1a formed on the side edge, and a folding members 2 Metropolitan bent downward from both side borders 11, 11 parts as a fulcrum 1a.

  The conveying device 9 includes a conveying roller 9A for carrying a cardboard sheet 10 and conveying it forward, and a pair of left and right conveying belts 9B and 9B disposed endlessly above both outer sides of the conveying roller 9A. The edge frames 1 and 1 are disposed along both end surfaces of the transport roller 9A, and the transport belts 9B and 9B are extended from the both end portions of the transport roller 9A to the upper end surfaces of the edge frames 1 and 1. The belt portion that is opposed to and is in pressure contact with the upper surface of the cardboard sheet 10 in the conveyor belt portion 9B travels forward, so that the inner portions of the both side ruled lines 11 and 11 of the cardboard sheet 10 are held together with the conveyor roller 9A. In this state, the cardboard sheet 10 is configured to be conveyed forward. The upper peripheral surface of the transport roller 9A and the upper end surface of the edge frame 1 are disposed so as to have substantially the same height.

  On the other hand, the bending member 2 is composed of a flexible plastic rod member 2A having a certain length, and both ends of the rod member 2A are disposed above the side edge frames 1 and 1. 3 and 3 are supported by the front and rear parts and are suspended in a state of being curved in a downward arc from the support parts 4 and 4 toward the central part 2a in the length direction, and the central part 2a, A rotary drive motor 5 is installed on the support frame 3 above the portion hanging down to a low position, and the base end portion of the crank member 6a is fixed to the rotary shaft of the rotary drive motor 5 and the crank member 6a is fixed. The upper end of the connecting rod 6b is pivotally attached to the tip, and the lower end of the connecting rod 6b is integrally connected to the central portion of the rod-like member 2A via the connecting fitting 6c.

  Further, the bar-like members 2A, 2A move in the vertical direction on the outer sides of the edge frames 1, 1 on both sides, and when moved downward, the corrugated cardboard projects horizontally outward from the edge frames 1, 1 by the central portion 2a. The standby posture of the rod-shaped member 2A before being bent downward on both sides of the corrugated cardboard sheet 10 is disposed at a position where it is pressed against the upper surface of the ruled lines 11, 11 near the both sides of the sheet 10. The central portion 2a is located slightly above the upper surface of the corrugated cardboard sheet 10 passing over the edge frame 1. From this state, the corrugated cardboard sheet 10 descends when the cardboard sheet 10 passes downward. The portion is configured to be bent downward from the both-side ruled lines 11 and 11 with the edge portions 1a and 1a of the edge frame 1 and 1 as fulcrums.

  A sensor (not shown) is provided for detecting that the corrugated cardboard sheet 10 conveyed by the conveying means 9 has reached the lower part of the center of the bar-shaped member 2A as the bending member 2. The detection signal of the sensor is input to the rotary drive motor 5 and the rotary drive motor 5 is rotated once to raise and lower the rod-like members 2A and 2A as described above. After that, it is configured to rise and wait for the next folding of the cardboard sheet 10.

  Since it is configured in this way, as shown in FIG. 9, the corrugated sheets 10 stacked in large numbers in the supply mechanism 20 are directed from the supply mechanism 20 in the length direction perpendicular to the conveying direction. In a state, the kicker sequentially feeds the sheets one by one. First, the printing apparatus 21 performs predetermined printing on the corrugated cardboard sheet 10, and then the ruled line processing machine 22 and the slot processing machine 23 are used to fold the body part of the cardboard case and the flap. After processing the ruled lines 11 and the slots 12 for forming, and then gluing the glue margin piece at one side end by the gluing roll part 24, the sheet is fed into the folding device A of the present invention by the conveying means 9, By means of the folding device A, both sides of the corrugated cardboard sheet 10 are bent downward at substantially right angles from the ruled lines 1111 on both sides, and creases suitable for folding are attached.

  The operation of the folding apparatus A will be described in detail. The corrugated cardboard sheet 10 is sandwiched at its center by a conveying means 9 comprising a conveying roll 9A and a conveying belt 9B, and both ruled lines 11, 11 are the edges of the edge frames 1, 1. When it is conveyed forward while maintaining the position located on the parts 1a and 1a and reaches the lower part of the central part of the rod-like member 2A that is the folding member 2 in the folding apparatus A, the rotational drive motor 5 is actuated to move to its rotational axis. The connected crank member 6a rotates downward, and the connecting rod 6b connected to the crank member 6a is moved downward.

  When the connecting rod 6b is moved downward, the center portion 2a of the rod-like member 2A connected to the lower end of the connecting rod 6b is pushed down, and the both side edge frames 1, 1 on the corrugated cardboard sheet 10 passing under the rod-like member 2A. The bar-like member 2A moves downward from this state to the outer vicinity of the ruled line 11 on the upper surface of both side portions protruding horizontally from the state, and further, the both sides of the corrugated cardboard sheet 10 are edge frames by the lower power. 1 and 1 refracts downward from the ruled lines 11 and 11 with the edge portions 1a and 1a as fulcrums.

  This refraction, that is, bending from the ruled lines 11 and 11, is caused by the pressing force by the bar-like member 2A to be uniform at the same time over the entire length between the front and rear end surfaces in the vicinity of the outer sides of the ruled lines 11 and 11 on the upper surfaces of both sides of the cardboard sheet 10. As shown in FIG. 3, the both sides of the corrugated cardboard sheet 10 are not displaced or distorted from the edge portions 1a and 1a of the edge frame 1 and 1 as shown in FIG. Bend downward accurately and smoothly from 11.

  In this way, both sides of the corrugated cardboard sheet 10 are bent by the lowering of the bar-like member 2A, and then the crank member 6a connected to the rotating shaft of the rotary drive motor 5 rotates upward, and the connecting rod 6b moves upward. Then, the central portion of the rod-shaped member 2A is lifted upward, and the operation of the rotary drive motor 5 is stopped when the standby position is reached. Then, when the next corrugated cardboard sheet 10 is conveyed by the conveying means 9 to below the bar-shaped member 2A, the both sides of the corrugated cardboard sheet 10 are separated from the ruled lines 11 and 11 by the lowering of the bar-shaped member 2A in the same manner as described above. Bend downward from

  The corrugated cardboard sheets 10 having both sides folded downward and creased are then sequentially conveyed to the folding device 26 by the conveying means 9. As shown in FIG. 4, the folding device 26 is provided with a plurality of forming rollers 26 a, 26 b,... 26 n on a portion through which both side ruled lines 11, 11 pass along the traveling direction of the cardboard sheet 10. These circumferential rollers 26a ', 26b' ... 26n 'of the forming rollers 26a, 26b,... 26n, as shown in FIG. In order to be able to fold, the groove surface for receiving the bent portion of the corrugated cardboard sheet 10 is inclined from the vertical state to an acute angle as appropriate at an appropriate angle.

  Then, the first forming roller 26a in which the circumferential groove 26a 'on the start end side of the folding device 26 is formed at a right angle from the terminal end side of the folding device A is folded at a substantially right angle downward in the corrugated cardboard sheet 10. Both sides of the cardboard sheet 10 are continuously received by the folding device 26, and both sides of the corrugated cardboard sheet 10 are folded further inward from the ruled lines 11, 11 by the forming rollers 26a, 26b,. The ends are joined and bonded to produce a cardboard case folded flat.

  FIGS. 6 and 7 show another folding apparatus A ′ according to the present invention. In the above embodiment, a rod-like member 2A is employed as the bending member 2, but in this embodiment, a cam-like member is used. Member 2B is used. Specifically, a rotary drive motor 5 ′ is installed on the support frames 3 ′ and 3 ′ disposed above the side edge frames 1 and 1 on the rear side of the folding device 26, and the rotary drive motor 5 ′ By fixing the outer peripheral portion of the cam-like member 2B made of a side-elliptical plate material to the rotation shaft, the rotation shaft of the rotation drive motor 5 ′ as the eccentric shaft 5a ′, and rotating the eccentric shaft 5a ′ once, The arcuate convex surface 2b of the cam-like member 2B located far from the eccentric shaft 5a 'is moved downward from the upper side of the edge frame 1 to bend the both side portions of the corrugated cardboard sheet 10 downward from the both-side ruled lines 11 and 11 portions. It is configured as follows.

  In this case, the cam-like members 2B and 2B are supported on the outer sides of the edge frames 1 and 1 on both sides so as to rotate on a vertical plane passing through the ruled lines 11 and 11 in the both sides of the cardboard sheet 10. , 3 ′ is arranged perpendicularly to a position protruding outward from 3 ′, and in a standby state, it passes over the edge frames 1 and 1 through a gentle arc surface having the shortest distance from the eccentric shaft 5a ′. The cardboard sheet 10 is located slightly above the upper surface of the cardboard sheet 10. From this state, when the cardboard sheet 10 passes below the cam-shaped member 2B, the lower peripheral surface side of the cam-shaped member 2B is the cardboard sheet 10 The eccentric shaft 5a ′ is configured to rotate once in a direction in which the eccentric shaft 5a ′ is rotated in the traveling direction. Since other configurations are the same as those of the above-described embodiment, the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

  Since it is configured in this manner, the corrugated cardboard sheet 10 which has been sent out from the supply mechanism 20 in the same manner as described above and has been subjected to printing, ruled line processing, slot processing, and gluing in sequence is sent to the folding apparatus A ′ by the conveying means 9. Then, both side portions thereof are bent substantially perpendicularly downward from both side ruled lines 11 and 11, and a crease suitable for folding is attached.

  Specifically, the folding device A is held while being held by the conveying means 9 composed of the conveying roll 9A and the conveying belt 9B and the ruled lines 11, 11 on both sides thereof are positioned on the edge portions 1a, 1a of the edge frames 1, 1. When the sensor detects that the corrugated cardboard sheet 10 that has been conveyed to the lower side of the cam-like members 2B, 2B is detected by the sensor, the rotational drive motor 5 'is activated and the rotational eccentric shaft 5a' The front end of the ruled line 11 on the upper surface of both side portions that protrudes horizontally from the side edge frames 1 and 1 of the corrugated cardboard sheet 10 that is rotated in a direction that synchronizes with the conveyance direction 10 and the convex surface 2b of the cam-like member 2B passes below. As shown in FIG. 8, after contacted with the outer side near side, the cardboard sheet 10 is moved downward and both sides of the corrugated cardboard sheet 10 are supported by the edge portions 1a and 1a of the edge frame 1, 1 as a fulcrum. Ruled line 11, part 11 Then fold it down.

  At this time, the convex surface 5b that abuts on both sides of the corrugated cardboard sheet 10 is configured to move in the conveying direction of the corrugated cardboard sheet 10 at the same circumferential speed as the conveying speed of the corrugated cardboard sheet 10. Is moved downward from the front end portion in the vicinity of the outer side of the ruled lines 11, 11, or from the front end portion to the outer vicinity portion of the front slot 12, and moves downward on both sides of the cardboard sheet 10. The crease lines 11 and 11 of the corrugated cardboard sheet 10 are not displaced or distorted from the edge portions 1a and 1a of the edge frame 1 and 1 by applying a pressing force only downward without applying a force in the conveying direction. It will bend downward accurately and smoothly from 11 and 11.

  Bending of both sides of the corrugated cardboard sheet 10 by the convex surface 5b of the cam-like member 2B is performed until the convex surface 5b passes through the rear end in the vicinity of the outer side of the ruled line 11, and the rear end of the corrugated cardboard sheet 10 is the cam. When the cam-like member 2B is moved forward and removed from the cam-like member 2B, the cam-like member 2B is rotated in the direction in which the convex surface 5b of the cam-like member 2B moves upward, that is, the above-mentioned standby posture, that is, the farthest distance from the eccentric shaft 5a ′. The short gentle arc surface stops at a position where it moves slightly above the upper surface of the cardboard sheet 10. When the next corrugated cardboard sheet 10 is conveyed by the conveying means 9 to below the cam-shaped member 2B, the cam-shaped member 2B is rotated again in the same manner as described above, and the convex surface 5b causes the corrugated sheet 10 Both side portions are bent downward from the ruled lines 11 and 11 portions.

  In this way, the corrugated cardboard sheets 10 whose both side portions are bent downward and creased are sequentially conveyed to the folding device 26 in the same manner as in the above embodiment, and the circumferential grooves 26a of the forming rollers 26a, 26b,. The both sides of the corrugated cardboard sheet 10 are further folded inward from the ruled lines 11 and 11 by ', 26b'... 26n ', and the both ends are joined and bonded to produce a flat corrugated cardboard case.

The simplified side view of a bending apparatus part. The simplified front view. The perspective view of a part of corrugated cardboard sheet | seat bent downward from the ruled line part. The simplified perspective view of a folding device part. Explanatory drawing which shows the folding process. The simplified front view of another bending apparatus of this invention. The simplified side view. The simplified side view of the state which is bending the side part of a cardboard sheet. A simplified side view of the entire corrugated box making machine. The perspective view of the cardboard sheet | seat which gave the ruled line and the slot process. The simplified side view of the conventional bending apparatus. The simplified front view. The perspective view of a part of corrugated cardboard sheet | seat bent downward from the ruled line part.

Explanation of symbols

1 Edge frame 2 Bending member
2A Rod-shaped member 3 Support frame 5 Rotation drive motor
6b Linkage 9 Transport means
10 Cardboard sheet
11 Ruled line
12 slots

Claims (3)

  An apparatus for bending the corrugated sheet and the slotted corrugated sheet by approximately 90 degrees downward along the ruled lines on both sides while the corrugated cardboard sheet is conveyed by the conveying means. An edge frame that supports the lower surface of the both-side ruled line portion of the corrugated cardboard sheet is disposed on both sides, and the cardboard sheet moves from the upper side to the lower side of the corrugated sheet sheet when passing the corrugated cardboard sheet. A cardboard sheet folding apparatus, wherein a folding member for folding downward from both ruled line portions is provided with the edge portion of the edge frame as a fulcrum.   The bending member is composed of a flexible synthetic resin rod-shaped member that is curved in a downward arc shape disposed along the outer side of both edge frames, and both ends thereof are arranged above the edge frame. The lower end of the connecting rod is connected to the center portion, and the connecting portion is moved up and down by the driving means installed on the supporting frame, and the central portion of the rod-shaped member is edged. 2. The corrugated cardboard folding apparatus according to claim 1, wherein the corrugated cardboard sheet folding apparatus is configured to move in the vertical direction on the outer side of the upper surface of the frame.   The bending member is composed of a cam-like member that rotates in the vertical direction about an eccentric shaft that is rotated by a rotation driving means installed on a support frame disposed above both side edge frames, and the convex surface of the cam-like member. 2. The corrugated cardboard sheet according to claim 1, wherein both sides of the corrugated cardboard sheet are bent downward by rotating the cardboard sheet in the conveying direction of the corrugated cardboard sheet from above to below the edge frame. Bending device.

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