Auto folding device for box manufacturing

Abstract

The present invention relates to an auto folding device for manufacturing boxes, and is structured such that as the cut sheet is conveyed at a constant speed through the feeding section, it passes through the vertical folding section and the horizontal folding section in stages, and the side part is folded upward in the longitudinal direction and then folded in the transverse direction, thereby allowing the cut sheet to be folded precisely and quickly without being affected by the specifications of the side part, and thereby simplifying the work changeover due to changes in box specifications. It is mainly composed of a feeding section (100), a vertical folding section (210), and a horizontal folding section (220).

Description

Technology Field

[0001] The present invention relates to an auto folding device for manufacturing boxes, and more specifically, to an auto folding device for manufacturing boxes in which the structure is improved so that the side part is folded upward in the longitudinal direction and then folded in the transverse direction while the cut sheet is conveyed at a constant speed through a feeding section and passes through a vertical folding section and a horizontal folding section in stages, thereby enabling precise and rapid folding of the cut sheet without being affected by the specifications of the side part, and thereby simplifying the work changeover due to changes in box specifications. Background Technology

[0002] Typically, boxes are manufactured by processing the raw material, corrugated cardboard, into a predetermined unfolded shape, folding it so that both ends overlap, and then joining them.

[0003] Here, as the folding process relies mostly on manual labor, productivity is reduced, and the defect rate increases due to significant variations in sealing quality depending on worker skill level; therefore, the automation of the box manufacturing process is urgently needed.

[0004] Accordingly, in the prior disclosed registered patent No. 10-2523334, the invention comprises: a paper cutting unit that cuts the paper according to the molding information of the product, processes longitudinal and transverse folding lines to form a first planar section to a fifth planar section, and molds the cut paper having processed wing sections; a folding unit that applies adhesive to a wing section at a set position while folding the cut paper during transport; and a product input unit that 3D scans the molding information of the product and feeds the scanned product into the cut paper being transported to the folding unit, wherein the folding unit comprises: a folding section disposed on the transport path of the cut paper and sequentially folding the first to fifth planar sections and wing sections during the transport of the cut paper; and a first coating member and a second coating member, each disposed on the transport path of the cut paper being transported from the folding section and sequentially applying adhesive to the leading edge of the first planar section and the end of the wing sections of the first planar section and the third planar section during the cutting paper folding process. A technology has been previously disclosed comprising: a second transfer member positioned below the folding section and transferring the supplied cutting sheet in a picked-up state; and a pressure member positioned on one side of the folding section and increasing the adhesion of the wing section by applying pressure to the wing section of the folding sheet during transfer, wherein the pressure member is positioned on one side of the folding section and consists of a pair of pressure pieces having flat surfaces positioned facing each other to apply pressure to the first planar section and the third planar section of the folded cutting sheet, and wherein the pressure pieces are installed to be movable in the Y-axis direction while fixed to a vertical frame.

[0005] However, the above-mentioned conventional technology is a technology that enables customized packaging to be made according to the molding information of the supplied product, but due to the characteristic that the cut sheet is folded by the wing, the wing must be newly manufactured and set up in a size and shape suitable for the change in the cut sheet specifications, so there is a problem that a lot of cost and time is required for work switching due to changes in box specifications. Prior art literature

[0006] KR 10-2523334 B1 The problem to be solved

[0007] Accordingly, the present invention was conceived to solve the aforementioned problems, and aims to provide an auto folding device for box manufacturing that can precisely and quickly fold the cut paper without being affected by the specifications of the side parts, by improving the structure so that the side part is folded upward in the longitudinal direction and then folded in the transverse direction while the cut paper is conveyed at a constant speed through the feeding section and passes through the vertical folding section and the horizontal folding section in stages, thereby simplifying the work changeover due to changes in box specifications. means of solving the problem

[0008] To achieve this purpose, the present invention is characterized by comprising: a feeding unit (100) equipped with a feeding unit (120) installed at predetermined intervals on a chain belt (110) to press the rear end surface of a cutting sheet (1) and feed it individually; a vertical folding unit (210) positioned on both sides of the chain belt (110) and folding both side parts (1b) upward with respect to the center part (1a) of the cutting sheet (1) being transported along the feeding unit (100); and a horizontal folding unit (220) positioned on both sides of the chain belt (110) and folding both side parts (1b), which are folded upward by the vertical folding unit (210), inwardly so as to face the center part (1a).

[0009] At this time, the vertical folding section (210) is characterized by comprising: a vertical folding chain (213) that moves in an orbital motion in the feeding direction of the cutting sheet (1) by riding on a plurality of vertical sprockets (211) installed on both sides of the chain belt (110) and forms a vertical inclined section (212) that is arranged at an upward inclined angle as it moves in the feeding direction of the cutting sheet (1); a vertical folding mill piece (214) that is installed at a predetermined interval on the vertical folding chain (213) and folds the side part (1b) in the longitudinal direction while moving at an upward inclined angle in the vertical inclined section (212); and a folding reference guide (215) that presses the boundary line between the center part (1a) and the side part (1b) on the upper part of the cutting sheet (1).

[0010] Additionally, the horizontal folding section (220) is characterized by including a horizontal folding chain (223) that moves along a plurality of horizontal sprockets (221) installed on both sides of the chain belt (110) in the feeding direction of the cutting sheet (1) and is arranged so that the spacing between them decreases as they move in the feeding direction of the cutting sheet (1) to form a horizontal inclined section (222), and a horizontal folding mill piece (224) that is installed at a predetermined interval on the horizontal folding chain (223) and moves into the inner area of ​​the cutting sheet (1) in the horizontal inclined section (222) to fold the side part (1b) in the horizontal direction.

[0011] Additionally, the horizontal folding section (220) is characterized by including a vertical shaft (225) installed on both sides of the chain belt (110) and rotating in connection with the chain belt (110), a spiral wheel (227) installed on the vertical shaft (225) and rotating, having a spiral cam line (226) formed on its outer surface that moves away from the center of rotation as it goes in the circumferential direction, and a plurality of folding rollers (228) spaced apart along the spiral cam line (226).

[0012] Additionally, a feeding unit (10) is provided for withdrawing individual cutting sheets (1) that are stacked in multiple layers and are positioned in the section of the chain belt (110). The feeding unit (10) includes a stacking cover (12) that is positioned on the upper side of one side of the chain belt (110), accommodates a plurality of cutting sheets (1) inside, and has an opening (11) formed at the bottom, and a movable plate (13) that is installed to close the opening (11) of the stacking cover (12), supports the cutting sheets (1) from below, and operates to open and close the opening (11) while being transported up and down. When the movable plate (13) moves downward from a distance extended relative to the thickness of one cutting sheet (1) to a distance reduced relative to the thickness of two cutting sheets (1) to open the opening (11), the feeding unit (120) presses the rear end surface of the cutting sheets (1) inside the stacking cover (12) by the track movement of the chain belt (110) to withdraw individual cutting sheets. It is characterized by.

[0013] Additionally, an alignment feeding unit (300) is provided to receive the cut sheet (1) folded through the horizontal folding unit (220) and to align and feed it between the feeding rollers (R) of the joint unit. The alignment feeding unit (300) is provided with an alignment wheel (310) that rotates around a pair of alignment shafts (311) spaced apart between the feeding unit (100) and the feeding rollers (R), and has an eccentric shaft (312) installed at an eccentric position relative to the alignment shafts (311); a return member (320) that provides a rotational force in the opposite direction so that the alignment wheel (310) returns after rotating in one direction; a pair of alignment stages (330) that are connected to the eccentric shafts (312) of the alignment wheel (310) and maintained in a horizontal state, and support the cut sheet (1) between the feeding unit (100) and the feeding rollers (R); and a member protruding upward from the end of the alignment stage (330). The cutting sheet (1) is characterized by including a pair of stoppers (340) that guide the cutting sheet (1) to be aligned and transported in a state where the cutting sheet (1) is caught and restrained and the cutting sheet (1) is aligned and transported in a state parallel to the rotation axis of the feeding roller (R), a pinion (350) installed on the alignment axis (311), and a rack (360) arranged parallel to the feeding direction of the cutting sheet (1) and engaged with the pinion (350).

[0014] Additionally, the stopper (340) is configured to move downward by a tilting part (370), and the tilting part (370) is characterized by including a link shaft (371) installed at the front end of the alignment stage (330) to enable the stopper (340) to move in a pivotal manner, a pneumatic actuator (372) having one end connected to the alignment stage (330) and the other end connected to the stopper (340), which controls the pivotal movement of the stopper (340) while adjusting the extension length by pneumatic pressure, and a switching part (400) that detects an alignment shaft (311) moving linearly in the feeding direction of the cutting sheet (1) by the arc movement of the alignment wheel (310) and controls the operation of the pneumatic actuator (372).

[0015] Additionally, the switching unit (400) comprises a valve rod (410) connected to an alignment shaft (311) and linearly transported together with the alignment shaft (311), a first valve port (420) formed on one side of the valve rod (410) and connected to the first air port (372a) of the pneumatic actuator (372) through a first discharge port (421), a second valve port (430) formed on the other side of the valve rod (410) and connected to the second air port (372b) of the pneumatic actuator (372) through a second discharge port (431), and first and second air inlets (441) (442) formed at positions corresponding to both sides of the valve rod (410) where the first and second valve ports (420) (430) are formed, installed to surround the valve rod (410). It is characterized by including a valve housing (440). Effects of the invention

[0016] According to the above configuration and operation, the present invention has a structurally improved structure in which the side part is folded upward in the longitudinal direction and then folded in the transverse direction while passing through the vertical folding section and the horizontal folding section in stages as the cut sheet is conveyed at a constant speed along the feeding section, thereby enabling precise and rapid folding of the cut sheet without being affected by the specifications of the side part, and thereby has the effect of simplifying work switching due to changes in box specifications. Brief explanation of the drawing

[0017] FIG. 1 is a schematic diagram showing the overall front view of an auto folding device for manufacturing a box according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing the operating state of the vertical folding part of an auto folding device for manufacturing boxes according to an embodiment of the present invention. FIG. 3 is a configuration diagram showing the operating state of the horizontal folding part of an auto folding device for manufacturing boxes according to an embodiment of the present invention. FIG. 4 is a configuration diagram showing a modified example of a horizontal folding part of an auto folding device for manufacturing boxes according to an embodiment of the present invention. FIG. 5 is a configuration diagram showing the folding sequence of cut paper by an auto folding device for box manufacturing according to an embodiment of the present invention. FIG. 6 is a configuration diagram showing the feeding section of an auto folding device for manufacturing boxes according to an embodiment of the present invention. FIG. 7 is a configuration diagram showing the operating state of the feeding unit of an auto folding device for box manufacturing according to an embodiment of the present invention. FIG. 8 is a configuration diagram showing the alignment feeding section of an auto folding device for manufacturing boxes according to an embodiment of the present invention. FIG. 9 is a configuration diagram showing the operating state of the alignment feeding section of an auto folding device for box manufacturing according to an embodiment of the present invention. FIGS. 10 to 11 are configuration diagrams showing a tilting part of an auto folding device for manufacturing a box according to an embodiment of the present invention. Specific details for implementing the invention

[0018] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Furthermore, in describing the present invention, detailed descriptions of related known functions are omitted if they are deemed obvious to those skilled in the art and could unnecessarily obscure the essence of the invention.

[0019] FIG. 1 is a configuration diagram showing the overall front view of an auto folding device for box manufacturing according to an embodiment of the present invention; FIG. 2 is a configuration diagram showing the operating state of the vertical folding section of the auto folding device for box manufacturing according to an embodiment of the present invention; FIG. 3 is a configuration diagram showing the operating state of the horizontal folding section of the auto folding device for box manufacturing according to an embodiment of the present invention; FIG. 4 is a configuration diagram showing a modified example of the horizontal folding section of the auto folding device for box manufacturing according to an embodiment of the present invention; FIG. 5 is a configuration diagram showing the cutting and folding sequence by the auto folding device for box manufacturing according to an embodiment of the present invention; FIG. 6 is a configuration diagram showing the feeding section of the auto folding device for box manufacturing according to an embodiment of the present invention; FIG. 7 is a configuration diagram showing the operating state of the feeding section of the auto folding device for box manufacturing according to an embodiment of the present invention; and FIG. 8 is an alignment feeding section of the auto folding device for box manufacturing according to an embodiment of the present invention. FIG. 9 is a configuration diagram showing the operating state of the alignment feeding part of an auto folding device for manufacturing a box according to an embodiment of the present invention, and FIG. 10 to 11 are configuration diagrams showing the tilting part of an auto folding device for manufacturing a box according to an embodiment of the present invention.

[0020] The present invention relates to an auto folding device for manufacturing boxes, and is structured such that as the cut sheet is conveyed at a constant speed through the feeding section, it passes through the vertical folding section and the horizontal folding section in stages, and the side part is folded upward in the longitudinal direction and then folded in the transverse direction, thereby allowing the cut sheet to be folded precisely and quickly without being affected by the specifications of the side part, and thereby simplifying the work changeover due to changes in box specifications. It is mainly composed of a feeding section (100), a vertical folding section (210), and a horizontal folding section (220).

[0021] The feeding unit (100) according to the present invention is equipped with a feeding unit (120) installed at predetermined intervals on a chain belt (110) to press the rear end surface of the cut sheet (1) and feed each one individually.

[0022] The above chain belt (110) is configured such that a pair of them are arranged parallel to each other to support the bottom surface of the cutting sheet (1), and the feeding member (120) presses the rear end surface of the cutting sheet (1) to feed it.

[0023] In this way, the cutting sheet (1) is transported at a constant speed by the above-described feeding unit (100) and is configured to sequentially pass through the vertical folding unit (210) and the horizontal folding unit (220) described later, thereby improving the folding precision of the cutting sheet (1).

[0024] In addition, the vertical folding section (210) according to the present invention is positioned on both sides of the chain belt (110) and is configured to fold both side parts (1b) upward with respect to the center part (1a) of the cutting sheet (1) being transported via the feeding section (100).

[0025] The above vertical folding section (210) comprises a vertical folding chain (213) that moves in an orbital motion in the feeding direction of the cutting sheet (1) by riding on a plurality of vertical sprockets (211) installed on both sides of the chain belt (110) and forms a vertical inclined section (212) that is arranged at an upward inclined angle as it moves in the feeding direction of the cutting sheet (1); a vertical folding mill piece (214) that is installed at a predetermined interval on the vertical folding chain (213) and folds the side part (1b) in the longitudinal direction while moving at an upward inclined angle in the vertical inclined section (212); and a folding reference guide (215) that presses the boundary line between the center part (1a) and the side part (1b) on the upper part of the cutting sheet (1).

[0026] At this time, the vertical folding chain (213) is configured to be synchronized with the chain belt (110) and maintained at the same feeding speed.

[0027] In FIG. 2, while the cutting sheet (1) is being transported along the feeding section (100), if the vertical folding mill piece (214) moves in the same direction as the feeding section (100) and is transported upward in the vertical inclined section (212), the side part (1b) is configured to be bent vertically (e.g., 90°) with respect to the center part (1a).

[0028] As the structure is improved so that the side part (1b) is folded upward by the vertical folding mill piece (214) of the vertical folding part (210) as described above, universality is provided so that it can be folded without being affected by the specifications of the side part (1b).

[0029] In addition, the horizontal folding part (220) according to the present invention is positioned on both sides of the chain belt (110) and is configured to fold inward (e.g., 180°) the two side parts (1b) that are upright by the vertical folding part (210) so as to face the center part (1a).

[0030] In FIG. 3, the horizontal folding section (220) according to one embodiment of the present invention includes a horizontal folding chain (223) that moves along a plurality of horizontal sprockets (221) installed on both sides of a chain belt (110) in an orbital motion in the feeding direction of the cutting sheet (1) and is arranged so that the spacing between them decreases as they move in the feeding direction of the cutting sheet (1) to form a horizontal inclined section (222), and a horizontal folding mill piece (224) that is installed spaced apart at a predetermined interval on the horizontal folding chain (223) and moves into the inner area of ​​the cutting sheet (1) in the horizontal inclined section (222) to fold the side part (1b) in the horizontal direction.

[0031] At this time, the horizontal folding chain (223) is configured to be synchronized with the chain belt (110) and maintained at the same feeding speed.

[0032] In FIG. 3, as the horizontal folding mill piece (224) moves in the same direction as the feeding section (100) while the cutting sheet (1) is being transported along the feeding section (100), the side part (1b) is folded, thereby providing versatility so that it can be folded without being affected by the specifications of the side part (1b).

[0033] In FIG. 4, the horizontal folding section (220) according to another embodiment of the present invention includes a vertical shaft (225) installed on both sides of a chain belt (110) and rotated in conjunction with the chain belt (110), a spiral wheel (227) installed on the vertical shaft (225) and rotated, having a spiral cam line (226) formed on its outer surface that moves away from the center of rotation as it goes in the circumferential direction, and a plurality of folding rollers (228) spaced apart along the spiral cam line (226).

[0034] And, as the above-mentioned cutting sheet (1) is transported along the feeding section (100), the dimensional wheel (227) rotates and the side part (1b) is folded, thereby providing versatility so that it can be folded without being affected by the specifications of the side part (1b).

[0035] In addition, a feeding unit (10) is provided for drawing out individual cutting sheets (1) that are stacked in multiple layers and are positioned in the chain belt (110) section.

[0036] In FIG. 6, the feeding unit (10) includes a loading cover (12) positioned on the upper side of one side of the chain belt (110) to accommodate a plurality of cut sheets (1) inside and to have an opening (11) formed at the bottom, and a movable plate (13) installed to close the opening (11) of the loading cover (12) to support the cut sheets (1) from below and to operate the opening (11) while being transported up and down.

[0037] Meanwhile, the above-mentioned loading cover (12) is composed of a stop plate that restricts the movement of the cutting sheet (1) in the feeding direction, and side plates that are arranged on both sides of the stop plate to restrain both sides in the width direction of the cutting sheet (1), and the side plates are screw-coupled to a screw rod so as to be moved in opposite directions to each other and adjusted in spacing.

[0038] And, when the above-mentioned movable plate (13) is moved downward from a distance extended relative to the thickness of one sheet of cut paper (1) to a distance reduced relative to the thickness of two sheets of cut paper (1) to open the opening (11), the feeding unit (120) is provided to press the rear end surface of the cut paper (1) inside the loading cover (12) by the track movement of the chain belt (110) so that each one is pulled out.

[0039] That is, as shown in Fig. 7, the feeding unit (120) is configured to press the rear end of the cut sheet (1) inside the loading cover (12) and pull out each one by means of the track movement of the chain belt (110) while the movable plate (13) is operated in an open direction downward.

[0040] In addition, an alignment feeding unit (300) is provided to receive the folded paper (1) through the horizontal folding unit (220) and to align and feed it between the feeding rollers (R) of the joint unit.

[0041] In FIG. 8, the alignment feeding unit (300) is rotated around a pair of alignment shafts (311) spaced apart between the feeding unit (100) and the feeding roller (R), and the alignment wheel (310) has an eccentric shaft (312) installed at an eccentric position relative to the alignment shaft (311); a return member (320) that provides a rotational force in the opposite direction so that the alignment wheel (310) returns after rotating in one direction; a pair of alignment stages (330) connected to the eccentric shaft (312) of the alignment wheel (310) and maintained in a horizontal state, and supporting the cutting sheet (1) between the feeding unit (100) and the feeding roller (R); and the leading edge (1a) of the cutting sheet (1) is caught and restrained by protruding upward from the end of the alignment stage (330) and the leading edge (1a) of the cutting sheet (1) is aligned parallel to the rotation axis of the feeding roller (R). It includes a pair of stoppers (340) that guide alignment transfer, a pinion (350) installed on an alignment shaft (311), and a rack (360) arranged parallel to the feeding direction of the cutting sheet (1) and engaged with the pinion (350).

[0042] The above return member (320) is formed as any one of a weight, an elastic body, or a shock absorber, and the above return member (320) is connected to an alignment wheel (310) corresponding to an eccentric position with respect to the alignment axis (311), thereby providing a turning force so that the alignment wheel (310) returns to the opposite direction after turning in one direction.

[0043] In FIG. 9, the alignment stage (330) is in a waiting state, having been moved upward by the rotational movement of the alignment wheel (310), and as the cutting sheet (1) is transported by pressure by the feeding trowel (120) of the feeding unit (100) and travels along the alignment stage (330), the front end surface (1a) of the cutting sheet (1) is positioned so that it is aligned parallel to the rotation axis of the feeding roller (R) while in contact with the stopper (340).

[0044] Afterwards, when the alignment stage (330) is transported in a horizontal linear state by the transport force of the above-mentioned cutting sheet (1), the alignment shaft (311) moves in an arc motion together with the alignment wheel (310), and the pinion (350) moves linearly and downward in the feeding direction of the cutting sheet (1) by riding on the rack (360), and from the point when the leading edge of the cutting sheet (1) enters between the feeding rollers (R), the stopper (340) moves downward to a position lower than the cutting sheet (1) together with the alignment stage (330), and is configured so that the restraint state of the leading edge surface (1a) of the cutting sheet (1) by the stopper (340) is released.

[0045] In this way, the structure is improved so that the above-mentioned cutting sheet (1) is fed in a folded state with its posture corrected by the feeding jaw (120) of the feeding unit (100) and enters between the feeding rollers (R) with its posture fixed by the stopper (340) of the alignment stage (330), thereby having the advantage of maintaining the folding posture of the cutting sheet (1) precisely and improving the stitching quality thereafter.

[0046] In addition, as the stopper (340) rotates downward together with the alignment stage (330) due to the conveying force of the cutting sheet (1), the restraining force of the cutting sheet (1) is quickly released, thereby enabling high-speed operation. In particular, when the alignment stage (330) is transported in a straight line in a horizontal state due to the conveying force of the cutting sheet (1), the alignment shaft (311) moves in an arc motion together with the alignment wheel (310), and the pinion (350) moves in a straight line along the rack (360) in the feeding direction of the cutting sheet (1), thereby having the advantage of expanding the alignment conveying section of the cutting sheet (1) by the stopper (340).

[0047] In addition, the alignment stage (330) is provided to support the cutting sheet (1) in a position higher than the alignment wheel (310) when the sheet is rotated upward.

[0048] Accordingly, when the stopper (340) is moved downward together with the alignment stage (330) by the conveying force of the above-mentioned cutting sheet (1), the cutting sheet (1) is seated on the outer surface of the alignment wheel (310) and the stopper (340) moves downward in a state where downward movement is restricted, thereby releasing the restraining force of the cutting sheet (1) by the stopper (340), so that the phenomenon of the leading edge (1a) of the cutting sheet (1) getting caught on the stopper (340) can be prevented.

[0049] In FIGS. 10 and 11, the stopper (340) is configured to pivot downward by the tilting part (370).

[0050] The above tilting unit (370) includes a link shaft (371) installed at the front end of the alignment stage (330) to enable pivoting movement of the stopper (340), a pneumatic actuator (372) having one end connected to the alignment stage (330) and the other end connected to the stopper (340), which controls the pivoting movement of the stopper (340) by adjusting the extension length by pneumatic pressure, and a switching unit (400) that detects the alignment shaft (311) moving linearly in the feeding direction of the cutting sheet (1) by the arc movement of the alignment wheel (310) and controls the operation of the pneumatic actuator (372).

[0051] And, when the movement of the alignment axis (311) in the feeding direction of the cutting sheet (1) is detected by the switching unit (400), the pneumatic actuator (372) is retracted to operate the stopper (340) downwardly, thereby releasing the restrained state of the leading edge (1a) of the cutting sheet (1); when the cutting sheet (1) is fed onto the alignment stage (330) toward the feeding roller (R) of the joint, the alignment wheel (310) is reverse-rotated by the return member (320), and the alignment axis (311) is returned and transported in the opposite direction of the cutting sheet (1) feeding; and when the switching unit (400) detects the return movement of the alignment axis (311) and extends the pneumatic actuator (372), the stopper (340) operates upwardly, thereby switching to a state where the leading edge (1a) of the cutting sheet (1) can be restrained, so that in high-speed operation, the leading edge (1a) of the cutting sheet (1) Feeding failures caused by the stopper (340) can be effectively prevented.

[0052] Additionally, the switching unit (400) comprises a valve rod (410) connected to an alignment shaft (311) and linearly transported together with the alignment shaft (311), a first valve port (420) formed on one side of the valve rod (410) and connected to the first air port (372a) of the pneumatic actuator (372) through a first discharge port (421), a second valve port (430) formed on the other side of the valve rod (410) and connected to the second air port (372b) of the pneumatic actuator (372) through a second discharge port (431), and first and second air inlets (441) (442) formed at positions corresponding to both sides of the valve rod (410) where the first and second valve ports (420) (430) are formed, installed to surround the valve rod (410). It includes a valve housing (440).

[0053] In FIG. 10, when the alignment stage (330) is in a waiting state in an upwardly transferred state, the valve rod (410) moves together with the alignment shaft (311) in the opposite direction of the cutting sheet (1) feeding, and when the first air inlet (441) and the first valve port (420) are connected by the movement of the valve rod (410) and compressed air is supplied to the first air port (372a) of the pneumatic actuator (372) through the first discharge port (421), the pneumatic actuator (372) extends and the stopper (340) pivots upward and is maintained in a state where it can restrain the front end surface (1a) of the cutting sheet (1).

[0054] In FIG. 11, when the valve rod (410) moves together with the alignment axis (311) in the feeding direction of the cutting sheet (1), the second air inlet (442) and the second valve port (430) are connected, and compressed air is supplied to the second air port (372b) of the pneumatic actuator (372) through the second discharge port (431), and the stopper (340) rotates downward by the contraction operation of the pneumatic actuator (372), thereby releasing the restraint state of the front end surface (1a) of the cutting sheet (1).

[0055] In this way, as the upward and downward pivoting operation of the stopper (340) is controlled in conjunction with the movement of the alignment axis (311) by the switching unit (400), there is an advantage in that the pivoting operation of the stopper (340) can be controlled using compressed air in a simple structure.

[0056] As described above, the detailed description of the present invention has explained the most preferred embodiment of the present invention, but various modifications are possible within the scope of the technical scope of the present invention. Accordingly, the scope of protection of the present invention should not be limited to the above embodiment, but should be recognized to include the technologies of the claims described below and equivalent technical means derived from these technologies. Explanation of the symbols

[0057] 100: Feeding section 210: Vertical folding section 220: Horizontal folding section 300: Alignment feeding section 400: Switching section

Claims

Claim 1 An auto folding device for manufacturing boxes, characterized by comprising: a feeding section (100) equipped with a feeding section (120) installed at predetermined intervals on a chain belt (110) to press the rear end surface of a cutting sheet (1) and feed each one individually; a vertical folding section (210) positioned on both sides of the chain belt (110) and folding both side parts (1b) upward with respect to a center part (1a) of a cutting sheet (1) being transported along the feeding section (100); and a horizontal folding section (220) positioned on both sides of the chain belt (110) and folding both side parts (1b) that have been folded upward by the vertical folding section (210) inwardly so as to face the center part (1a). Claim 2 In claim 1, the vertical folding section (210) is characterized by comprising: a vertical folding chain (213) that orbits in the feeding direction of the cutting sheet (1) by riding on a plurality of vertical sprockets (211) installed on both sides of the chain belt (110) and forms a vertical inclined section (212) that is arranged at an upward inclined angle as it moves toward the feeding direction of the cutting sheet (1); a vertical folding mill piece (214) that is installed at a predetermined interval on the vertical folding chain (213) and folds the side part (1b) in the longitudinal direction while moving at an upward inclined angle in the vertical inclined section (212); and a folding reference guide (215) that presses the boundary line between the center part (1a) and the side part (1b) on the upper part of the cutting sheet (1). Claim 3 The auto folding device for manufacturing a box according to claim 1, wherein the horizontal folding section (220) comprises a horizontal folding chain (223) that orbits in the feeding direction of the cutting sheet (1) by riding on a plurality of horizontal sprockets (221) installed on both sides of the chain belt (110) and is arranged so that the spacing between them decreases as they move in the feeding direction of the cutting sheet (1) to form a horizontal inclined section (222), and a horizontal folding mill piece (224) that is installed spaced apart at a predetermined interval on the horizontal folding chain (223) and folds the side part (1b) in the horizontal direction while moving into the inner area of ​​the cutting sheet (1) in the horizontal inclined section (222). Claim 4 In claim 1, the horizontal folding part (220) is characterized by comprising: a vertical shaft (225) installed on both sides of a chain belt (110) and rotated in connection with the chain belt (110); a spiral wheel (227) installed on the vertical shaft (225) and rotated, having a spiral cam line (226) formed on its outer surface that moves away from the center of rotation as it goes in the circumferential direction; and a plurality of folding rollers (228) spaced apart along the spiral cam line (226). Claim 5 In claim 1, a feeding unit (10) is provided for withdrawing individual cutting sheets (1) that are stacked in multiple layers and are positioned in the section of the chain belt (110). The feeding unit (10) includes a stacking cover (12) positioned on the upper side of one side of the chain belt (110) to accommodate a plurality of cutting sheets (1) inside and have an opening (11) formed at the bottom, and a movable plate (13) installed to close the opening (11) of the stacking cover (12) to support the cutting sheets (1) from below and to operate the opening (11) while being transported up and down. When the movable plate (13) moves downward from a distance extended relative to the thickness of one cutting sheet (1) to a distance reduced relative to the thickness of two cutting sheets (1) to open the opening (11), the feeding unit (120) presses the rear end surface of the cutting sheets (1) inside the stacking cover (12) by the track movement of the chain belt (110) to withdraw individual cutting sheets. An auto folding device for manufacturing boxes characterized by being configured to allow for withdrawal. Claim 6 In claim 1, an alignment feeding unit (300) is provided to receive the cut paper (1) folded through the horizontal folding unit (220) and to align and feed it between the feeding rollers (R) of the joint unit. The alignment feeding unit (300) is provided with an alignment wheel (310) that rotates around a pair of alignment shafts (311) spaced apart between the feeding unit (100) and the feeding rollers (R), and has an eccentric shaft (312) installed at an eccentric position relative to the alignment shafts (311); a return member (320) that provides a rotational force in the opposite direction so that the alignment wheel (310) returns after rotating in one direction; a pair of alignment stages (330) connected to the eccentric shafts (312) of the alignment wheel (310) and maintained in a horizontal state, and supporting the cut paper (1) between the feeding unit (100) and the feeding rollers (R); and the alignment stage (330). An auto folding device for manufacturing boxes, characterized by comprising: a pair of stoppers (340) that protrude upward at the end and guide the cutting sheet (1) to be aligned and transported so that the cutting sheet (1) is aligned and transported in a state parallel to the rotation axis of the feeding roller (R); a pinion (350) installed on the alignment axis (311); and a rack (360) arranged parallel to the feeding direction of the cutting sheet (1) and engaged with the pinion (350). Claim 7 In claim 6, the stopper (340) is configured to rotate downward by a tilting part (370), and the tilting part (370) is characterized by comprising: a link shaft (371) installed at the leading end of an alignment stage (330) to enable rotational movement of the stopper (340); a pneumatic actuator (372) having one end connected to the alignment stage (330) and the other end connected to the stopper (340), which controls rotational movement of the stopper (340) while adjusting the extension length by pneumatic pressure; and a switching part (400) that detects an alignment shaft (311) moving linearly in the feeding direction of the cutting sheet (1) by the arc movement of an alignment wheel (310) and controls the operation of the pneumatic actuator (372). Claim 8 In claim 7, the switching unit (400) comprises a valve rod (410) connected to an alignment shaft (311) and linearly transported together with the alignment shaft (311), a first valve port (420) formed on one side of the valve rod (410) and connected to the first air port (372a) of a pneumatic actuator (372) through a first discharge port (421), a second valve port (430) formed on the other side of the valve rod (410) and connected to the second air port (372b) of a pneumatic actuator (372) through a second discharge port (431), and a first, at a position corresponding to both sides of the valve rod (410) where the first and second valve ports (420) (430) are formed, installed to surround the valve rod (410). An auto folding device for manufacturing boxes, characterized by including a valve housing (440) in which two air inlets (441) and (442) are formed.

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