JP2006056692A - Sheet edge folding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely fold back a sheet edge in a steady state without continuously feeding a sheet material in a sheet edge folding device for folding back the edge of a sheet material used for manufacturing package-related products and printing and booking-related products. <P>SOLUTION: This sheet edge folding device comprises a horizontal placing means A having a loading table part 1 for horizontally placing sheets S thereon in the state of projecting a sheet folded end part S2 arranged continuously with the outside of the sheet edge S1 thereof through a pleat (a) and a lifting loading table part 2 installed at the front end of the loading table part 1 so as to be liftably drivable, and a sheet folding means B having parallel swing arms 13 and 14 pivotally supported, through bearing parts 12, on both sides of a liftably drivable support part 11 installed from the upper side of the sheet edge part S1 to the outside of the sheet folded end part S2 and a sheet folding plate 22 pivotally connected to the lower end parts of the arms and integrally fitted to a movable support part 21 swingably drivable in the longitudinal direction through the arms. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet edge folding device for folding an edge of a sheet material used for manufacturing a package-related product such as a solid packaging paper container or a liquid packaging paper container, or a printing bookbinding-related product.

  Conventional sheet end folding devices for folding the end of sheet material include devices of various structural forms, such as a package container box filling and sealing packaging device, a printing device in bookbinding, or a device such as a bookbinding device. Often installed on the inline.

  In addition, the sheet edge folding mechanism of the conventional sheet edge folding apparatus includes a triangular guide plate, a folding guide plate system, and a roll edge guide system, all of which feed while moving the sheet continuously. In this method, the end of the moving sheet is folded back.

  In addition, as sheet materials for package-related products, blank sheets for boxing boxes such as cardboard boxes and paper boxes for packaging and transportation, and paper for liquid packaging that wraps beverages such as juice, liquor, milk, etc. There are blank sheets for making containers and the like, and blank sheets for making cup-like containers for packaging fast food such as instant ramen.

  Among these blank sheets, one side of the blank sheet paper (cardboard) substrate sheet used for making liquid packaging containers for filling and packaging liquid contents such as beverages is coated with synthetic resin or synthesized. By laminating a resin film, a synthetic resin layer is laminated to impart liquid resistance.

  This rectangular blank sheet of composite material with liquid resistance is folded into a square tube shape, rounded into a cylindrical shape, or a fan-shaped blank sheet is rounded into a cup shape with a truncated cone shape. Folded sheet edges and rolled sheet edges are stacked and heat sealed, and assembled and boxed, box-shaped, cylindrical, cylindrical, cup-shaped, etc., but placed on the inner surface of the container In general, the edge of the blank sheet that comes into contact with the liquid (end surface, edge) is edge protected with the synthetic resin layer of the blank sheet as the outer surface and the end of the blank sheet folded to provide liquid resistance. Processing is performed.

  The present invention relates to a sheet edge folding device for folding an edge of a sheet material used for manufacturing a package-related product such as a solid packaging paper container or a liquid packaging paper container, or a product related to printing and bookbinding processing. An object of the present invention is to ensure that the end of the sheet can be folded back in a stationary state without feeding.

The invention according to claim 1 of the present invention includes a mounting table portion 1 for horizontally mounting a sheet S by projecting a sheet folding end portion S2 continuously provided on the sheet end portion S1 through a fold a. A horizontal placing means A provided with a raising and lowering placing table portion 2 provided at the front end of the placing table portion 1 so as to be capable of raising and lowering driving, and raising and lowering provided from above the sheet end portion S1 to the outer side of the sheet folding end portion S2. Two parallel swing arms 13 and 14 that are pivotally supported on both sides of a support portion 11 that can be driven via a bearing portion 12, and are pivotally connected to lower ends of the parallel swing arms 13 and 14, and the parallel swing arm 13. , 14, and a sheet folding means B provided with a sheet folding plate 22 integrally attached to a movable support portion 21 that can be driven to swing in the front-rear direction. Sheet folding end S2 from pedestal 2 The sheet end plate S1 of the sheet S placed horizontally with the sheet fold protruding from the front end corner portion 2a of the elevating and placing table 2 and the sheet return end portion S2 by the lowering operation of the sheet folding means B. And the front end portion 22a is bent at a right angle through the crease a, and then the lifting platform 2 is lowered to form a space on the lower surface of the sheet end S1, and then the sheet folding means B The sheet folding plate 22 is oscillated and moved in the direction of the front end portion of the mounting table 1, and the sheet folding end portion S 2 folded at a right angle is pushed and bent at the tip portion of the sheet folding plate 22, The sheet end folding device is characterized in that it is sandwiched between the upper surface of the sheet folding plate 22 and folded back to the sheet end portion S1.

  According to a second aspect of the present invention, in the sheet end portion folding apparatus according to the first aspect, the tip end portion 22a of the sheet folding plate 22 of the sheet folding means B has a downward inclined surface. A sheet end folding device.

  The invention according to claim 3 of the present invention is the sheet end folding apparatus according to any one of claims 1 and 2, wherein the sheet S has a single material configuration of a paper layer. It is a sheet end folding device.

  The invention according to claim 4 of the present invention is the sheet end folding apparatus according to any one of claims 1 or 2, wherein the sheet S is coated or coated on the paper layer and the front or back surface of the paper layer. A sheet end folding device having a layer structure of a composite material with a laminated synthetic resin film layer.

  The invention according to claim 5 of the present invention is the sheet end folding apparatus according to any one of claims 1 or 2, wherein the sheet S is laminated on the paper layer and the front or back surface of the paper layer. The sheet folded end portion S2 connected to the end portion S1 of the sheet S through the fold a is formed on the front or back surface of the paper layer. The sheet end folding device is formed by extending only a laminated synthetic resin film layer.

  The invention according to claim 9 of the present invention is the sheet end folding apparatus according to any one of claims 1 or 2, wherein the sheet S is coated or coated on the paper layer and the front or back surface of the paper layer. A sheet folded end portion S2 to be folded, which has a layer structure of a composite material with a laminated synthetic resin layer and is connected to an end portion S1 of the sheet S via a fold line a, is connected to the paper layer 11 The composite material with the synthetic resin layer 12 is formed by continuously extending from the outer fold a of the sheet end S1, and the sheet folding end from the sheet end S1 across the fold a. The sheet end folding device is characterized in that the paper layer 11 extending over the portion S2 is provided with a cutting portion 11a cut into a thickness that is approximately half the thickness.

As shown in FIGS. 5 (a) to 5 (b), the sheet end folding device of the present invention,
1) A table 1 for placing a sheet S horizontally by projecting a sheet folding end S2 connected to the sheet end S1 through a crease a, and driving up and down to the front end of the table 1 Horizontal mounting means A provided with an elevating mounting table 2 operably provided;
2) Two parallel swing arms 13, 14 that are pivotally supported via bearings 12 on both sides of a support 11 that can be moved up and down and provided on the outer side of the sheet folding end S2 from above the sheet end S1. And a folded-back seat that is pivotally connected to the lower ends of the parallel swing arms 13 and 14 and attached integrally to a movable support portion 21 that can be driven to swing in the front-rear direction via the parallel swing arms 13 and 14. And a sheet folding means B including a plate 22.

  For this purpose, as shown in FIG. 6, the sheet S is placed horizontally on the elevating and placing table 2 of the horizontal placing means A with the sheet folding end S2 protruding, as shown in FIG. Then, by lowering the sheet folding means B, the front end corner 2a of the elevating mounting table 2 and the sheet folding are brought into sliding contact with the projected sheet folding end S2 while the front end 22a of the sheet folding plate 22 is slidably contacted. It can be bent at a right angle via the crease a by the front end 22a of the sheet folding plate 22 located above the end S2.

  Then, as shown in FIG. 8, the lifting / lowering table 2 is moved down to form a space on the lower surface of the sheet end S1, and then the sheet folding plate 22 of the sheet folding means B is used. Is swung in the direction of the front end of the mounting table 1 so that the sheet folding end S2 bent at a right angle is pushed and bent at the tip of the sheet folding plate 22 while the lower surface of the support 11 is 11a and the upper surface 22b of the sheet folding plate 22, and the sheet folding end portion S2 can be overlapped and crimped on the sheet end portion S1 surface to be folded.

  In addition, as shown in FIG. 5A, the sheet end folding apparatus of the present invention is configured such that the angle θ of the leading end 22a of the sheet folding plate 22 of the sheet folding means B is, for example, 90 ° or less, or 45 °. Can be set in a range of about ~ 90 °. For example, when θ is a downward inclined surface of 90 ° or less, the sheet folding end portion S2 of the sheet S is moved up and down by the lowering operation of the sheet folding means B. When the front end corner portion 2a of the section 2 and the front end portion 22a of the sheet folding plate 22 above the sheet folding end portion S2 are folded at a right angle through the fold a, the front end portion 22a of the sheet folding plate 22 is folded back. The position of first contact with the upper surface of the end portion S2 can be set closer to the front end side of the sheet folding end portion S2, and the sliding contact stress of the front end portion 22a of the sheet folding plate 22 with respect to the upper surface of the sheet folding end portion S2 can be further increased. Can be relaxed The

  Further, the sheet end folding device of the present invention includes the sheet folding end S2 of the sheet S having a single layer structure of the paper layer 11 shown in FIG. 1A and the paper layer 11 shown in FIG. 2A. And the sheet folding end S2 of the sheet S having a layer structure made of a composite material composed of a synthetic resin layer 12 coated or laminated on the front or back surface of the paper layer, as shown in FIG. As shown in FIG. 7, the sheet folding means B is lowered and protruded from the lifting / lowering table 2 so as to protrude horizontally from the lifting / lowering table 2. While the front end portion 22a of the sheet folding plate 22 is slidably contacted with the folding end portion S2, a crease is formed by the front end corner portion 2a of the lifting and lowering table 2 and the front end portion 22a of the sheet folding plate 22 above the sheet folding end portion S2. It can be bent at a right angle via a.

  Then, as shown in FIG. 8, the lifting / lowering table 2 is moved down to form a space on the lower surface of the sheet end S1, and then the sheet folding plate 22 of the sheet folding means B is used. Is swung in the direction of the front end of the mounting table 1 so that the sheet folding end S2 bent at a right angle is pushed and bent at the tip of the sheet folding plate 22 while the lower surface of the support 11 is 11a and the upper surface 22b of the sheet folding plate 22, and the sheet folding end portion S2 can be overlapped and crimped on the sheet end portion S1 surface to be folded.

In addition, the sheet edge folding apparatus of the present invention has a layer configuration of a composite material of the paper layer 11 shown in FIG. 3A and the synthetic resin film layer 13 laminated on the front or back surface of the paper layer. Then, the sheet folded end portion S2 connected to the end portion S1 of the sheet S through the crease a extends the synthetic resin film layer 13 laminated and laminated on the surface of the paper layer 11. The sheet folded end portion S2 consisting only of the synthetic resin film layer 13 of the sheet S, the paper layer shown in FIG. 4 (a), and the synthetic resin layer coated or laminated on the front or back surface of the paper layer A sheet S having a layer structure made of a composite material, and a sheet folded end S2 to be folded connected to an end S1 of the sheet S through a fold a is formed between the paper layer 11 and the synthetic resin layer. 12 with the composite material The paper layer 11 is formed by extending continuously from the fold a on the outer side of the sheet end S1, and the paper layer 11 extending from the sheet end S1 to the sheet folding end S2 across the fold a is provided with a layer. As shown in FIG. 6, the sheet mounting end portion 2 of the horizontal mounting means A is used as the sheet folding end portion S2 of the sheet S provided with the cutting portion 11a that is thinly cut to about half the thickness. As shown in FIG. 7, the sheet folding means B is moved downward to lower the sheet folding end B2 so as to project from the lifting / lowering platform 2 and to be placed horizontally as shown in FIG. While the front end portion 22a of the sheet folding plate 22 is slidably contacted, the front end corner portion 2a of the elevating and placing table 2 and the front end portion 22a of the sheet folding plate 22 located above the sheet folding end portion S2 are perpendicular to each other through the fold a. Can be folded.

  Then, as shown in FIG. 8, the lifting / lowering table 2 is moved down to form a space on the lower surface of the sheet end S1, and then the sheet folding plate 22 of the sheet folding means B is used. Is swung in the direction of the front end of the mounting table 1 so that the sheet folding end S2 bent at a right angle is pushed and bent at the tip of the sheet folding plate 22 while the lower surface of the support 11 is 11a and the upper surface 22b of the sheet folding plate 22, and the sheet folding end portion S2 can be overlapped and crimped on the sheet end portion S1 surface to be folded.

  As described above, according to the sheet edge folding device of the present invention, the base material and the synthetic resin layer 12 by the paper layer 11 to which liquid resistance is imparted or the base material and the synthetic resin film layer 13 by the paper layer 11 are formed. As a composite material blank sheet S, a rectangular blank sheet is folded into a rectangular tube shape, rounded into a cylindrical shape, or a fan-shaped blank sheet is rounded into a conical or truncated cone cup shape, The folded sheet end and the rolled sheet end are overlapped and heat-sealed, and the blank sheet S for assembling and boxing into a box shape, a rectangular tube shape, a cylindrical shape, a cup shape, etc. into a rectangular tube shape When it is folded, rolled into a cylinder or cup, heat sealed, and assembled and boxed into a box, square tube, cylinder, cup, etc. In In order to impart liquid resistance to the sheet end S1 (end face, edge) portion of the blank sheet S to be prepared, the outer side of the sheet end S1 of the blank sheet S is formed with the synthetic resin layer of the blank sheet S as the outer surface. The sheet folding end portion S2 extending from the crease a can be folded back and overlapped and crimped to be folded back. If necessary, the overlapping inner surface can be adhered to the sheet in edge protection processing. It is effective in improving the folding accuracy and efficiency of the end folding process.

  The sheet edge folding device of the present invention will be described in detail below based on the embodiment. First, the sheet S to be folded for folding the sheet edge in the present invention is used for container boxing. It is a sheet of various shapes used for various applications including a blank sheet such as a rectangular sheet and a fan-shaped sheet, and as shown in FIG. In addition, a straight crease a (a fold without a cut ruled line, a fold with a cut ruled line, or a crease line is not printed on the end S1 of the sheet S. A sheet folding end portion S2 to be folded continuously provided through the fold a is a single layer of the paper layer 11. The material is the crease a at the sheet end S1. Continuously are those formed by extending.

  Then, using the apparatus of the present invention, as shown in FIG. 1 (b), the sheet folded end S2 having a layer structure of a single material of the paper layer 11 is folded back from the fold a to the sheet end S1 surface. By superposing and pressure-bonding, the superposed inner surface is adhered as required.

In addition, in the present invention, the sheet S to be folded for folding the sheet edge is composed of a paper layer 11 and a composite coated or laminated on the front or back surface of the paper layer 11 as shown in FIG. A sheet folded end portion S2 to be folded, which has a layer structure made of a composite material with the resin layer 12 (or a synthetic resin film layer) and which is continuously provided through a linear fold a of the end portion S1 of the sheet S. May be formed by continuously extending a composite material of the paper layer 11 and the synthetic resin layer 13 from the crease a outside the sheet end S1.

  Then, using the apparatus of the present invention, as shown in FIG. 2 (b), the sheet folded end S2 having a layer structure of a composite material of the paper layer 11 and the synthetic resin layer 12 (or the synthetic resin film layer) is The sheet is folded back from the crease a, and is superimposed and pressure-bonded on the sheet end S1 surface, and the overlapped inner surface is adhered as necessary.

  In addition, in the present invention, the sheet S to be folded for folding the sheet edge is bonded to the paper layer 11 and laminated on the front or back surface of the paper layer 11 as shown in FIG. It is a layer structure of a composite material with a synthetic resin film layer 13 provided with an agent layer 14 (sealant layer) on the inner surface of the laminate as necessary, and is connected to the end S1 of the sheet S through a linear fold a. Only the synthetic resin film layer 13 provided with the adhesive layer 14 (sealant layer) laminated and laminated on the paper layer 11 on the inner surface of the laminated sheet S1 is provided at the sheet end S1. In order to protect the edge of the sheet S along the fold line a outside the sheet end part S1, the sheet folding end part S2 is formed from the synthetic resin. What was comprised by the film layer 13 may be used.

  Then, using the apparatus of the present invention, as shown in FIG. 3 (b), the sheet folding end S2 formed by the synthetic resin film layer 13 continuously extending from the fold line a outside the sheet end S1. Is folded from the crease a and applied to the surface of the sheet end S1 by pressure, and the overlapped inner surface is adhered with an adhesive layer 14 (sealant layer) as required.

  In addition, in the present invention, the sheet S to be folded for folding the sheet edge is composed of a paper layer 11 and a composite coated or laminated on the front or back surface of the paper layer 11 as shown in FIG. A sheet folded end portion S2 to be folded, which has a layer structure of a composite material with the resin layer 12 (or a synthetic resin film layer) and is connected to the end portion S1 of the sheet S via a linear fold a. Is formed by continuously extending a composite material of the paper layer 11 and the synthetic resin layer 12 from the fold a of the sheet end S1, and for edge protection of the sheet S, The paper layer 11 extending from the sheet end S1 to the sheet folding end S2 across the fold a may be cut to a thickness approximately half that of the cut portion 11a.

  And using this invention apparatus, as shown in FIG.4 (b), the sheet | seat folding | turning edge part S2 of the layer structure by the composite material of the paper layer 11 and the synthetic resin layer 12 (or synthetic resin film layer) is the said, Folded from the crease a and overlapped on the sheet end S1 surface, the cut ends 11a of the sheet end S1 and the sheet folded end S2 are overlapped and pressure-bonded to each other, and the overlapping inner surface is adhered with an adhesive layer To do.

  The structure of the sheet end folding apparatus of the present invention will be described in detail below. As shown in the side view of the apparatus of the present invention in FIG. 5A and the front view of FIG. , And a sheet folding means B.

  As shown in the side view of FIG. 5 (a), the horizontal placing means A manufactures a sheet S such as a blank sheet of a package-related product such as a solid packaging paper container or a liquid packaging paper container, or a product related to printing and bookbinding. A mounting table on which a sheet S such as a printing sheet used in the above is placed horizontally by projecting a sheet folding end S2 connected to a sheet end S1 of the sheet S through a linear fold a. And a lifting / lowering table part 2 provided at the front end of the mounting table part 1 so as to be capable of driving up and down.

  As shown in the side view of FIG. 5 (a) and the front view of FIG. 5 (b), the lifting / lowering mounting section 2 of the horizontal mounting means A is an actuator 3 (for example, an air cylinder) that reciprocates linearly in the vertical direction. The actuator 3 is connected to the actuating rod, and is moved up and down by the extending or shortening operation of the actuator 3.

  As shown in the side view of FIG. 5 (a) and the front view of FIG. 5 (b), the sheet folding means B can be moved up and down from the top of the sheet end S1 to the outside of the sheet folding end S2. The support portion 11 is provided with bearing portions 12 and 12 on both sides of the support portion 11, and two outside the bearing portions 12 and 12 are respectively supported by the support shaft portions 12 a and 12 a. Parallel swing arms 13 and 14 are provided.

  The support portion 11 is connected to an operating rod of an actuator 17 (for example, an air cylinder) that linearly reciprocates in the vertical direction, and is driven to move up and down by an extension operation or a shortening operation of the actuator 17.

  A movable support portion 21 is pivotally connected to the lower end portions of the parallel swing arms 13 and 14 via support shaft portions 21a and 21a, respectively. The movable support portion 21 connects the parallel swing arms 13 and 14 to each other. The movable support portion 21 is provided with a sheet folding plate 22 that is integrally attached toward the horizontal placing means A side. In the figure, reference numeral 23 denotes a stop plate for defining a bottom stop point in the lowering operation of the support portion 11 and can be provided as necessary.

  The relationship between the distance d between the front end 22a of the sheet folding plate 22 of the sheet folding means B and the front end surface of the lifting / lowering table 2 and the thickness t of the folded sheet S is 0 ≦ dt−0.5 mm. The angle θ of the front end portion 22a of the sheet folding plate 22 is 90 °, or 45 ° ≦ θ <90 °, and a downward inclined surface is provided.

  As the support shaft portion 12a of one of the parallel swing arms 13 and 14 supported by the bearing portions 12 and 12, for example, the support shaft portion 12a of the parallel swing arm 14 and the parallel swing thereof. The arm 14 can rotate integrally with the arm 14, and an operating arm 15 is attached to the support shaft portion 12a. The operating arm 15 has an operating rod for an actuator 16 (for example, an air cylinder) that linearly reciprocates in a substantially horizontal direction. 16a is connected, and the support shaft portion 12a of the parallel swing arm 14 is rotated by the extending or shortening operation of the actuator 16 so that the parallel swing arms 13 and 14 can be driven to swing in parallel. The movable support portion 21 and the sheet folding plate 22 are driven to swing in the front-rear direction via the arms 13 and 14. It has become a possible work.

  Next, the sheet edge folding operation sequence by the sheet edge folding apparatus according to the present invention will be described below with reference to side views shown in FIGS. 6 to 8. First, as shown in FIG. The sheet S is placed horizontally on the upper surface of the placing table 1 and the lifting platform 2 of the placing means A.

  At that time, as shown in FIG. 6, the sheet S has a sheet folding end portion S2 continuously connected to the sheet end portion S1 of the sheet S via a linear fold a, as shown in FIG. Project from the front edge and place horizontally.

  Subsequently, as shown in FIG. 7, the sheet folding means B is moved downward by the actuator 17 so that the sheet folding end S2 of the sheet end S1 protruded from the front end edge of the lifting / lowering platform 2 is The sheet is folded at a right angle through the fold a by the front end corner 2a of the elevating and placing table 2 and the front end 22a of the sheet folding plate 22 above the sheet folding end S2.

  Subsequently, as shown in FIG. 8, the lifting / lowering platform 2 is lowered by the actuator 3 to form a space on the lower surface of the sheet end S1, and then the supporting shaft 12a and The parallel swing arms 13 and 14 are driven and rotated in the clockwise direction in the figure, and the lower end portions of the parallel swing arms 13 and 14 are swung leftward about the support shaft portions 12a and 12a, respectively. The sheet folding plate 22 of the means B is swung in the direction of the front end of the mounting table 1 and the sheet folding end S2 bent at a right angle is pushed and bent at the tip of the sheet folding plate 22. On the other hand, it is sandwiched between the lower surface 11a of the support portion 11 and the upper surface 22b of the sheet folding plate 22, and is folded back to the sheet end S1 surface.

  Thereafter, the support shaft portion 12a and the parallel swing arms 13 and 14 are driven to rotate counterclockwise in the drawing by the shortening operation of the actuator 16, and the lower end portions of the parallel swing arms 13 and 14 are respectively connected to the support shaft portion 12a, The sheet folding plate 22 of the sheet folding means B is pivoted and moved outward from the front end portions of the placing table 1 and the lifting and placing table 2, and then the actuator 17. The support part 11 of the sheet folding means B is lifted by the shortening operation to return to the original position, and the lifting / lowering table part 2 is lifted by the extending action of the actuator 3 to lift and lower the horizontal placing means A. The mounting table 2 and the sheet folding means B are returned to their original positions shown in FIG.

(A)-(b) is a sectional side view explaining an example of the form of the sheet | seat turned up using the sheet | seat edge part folding | turning apparatus of this invention. (A)-(b) is a sectional side view explaining the other example of the form of the sheet | seat turned up using the sheet | seat edge part folding | turning apparatus of this invention. (A)-(b) is a sectional side view explaining the other example of the form of the sheet | seat turned up using the sheet | seat edge part folding | turning apparatus of this invention. (A)-(b) is a sectional side view explaining the other example of the form of the sheet | seat turned up using the sheet | seat edge part folding | turning apparatus of this invention. (A) is a side view of the sheet | seat edge part folding | turning apparatus of this invention, (b) is the front view. The side view explaining the folding | turning operation | movement order of the sheet | seat edge part folding | turning apparatus of this invention. The side view explaining the folding | turning operation | movement order of the sheet | seat edge part folding | turning apparatus of this invention. The side view explaining the folding | turning operation | movement order of the sheet | seat edge part folding | turning apparatus of this invention.

Explanation of symbols

S ... sheet S1 ... sheet end S2 ... sheet folded end A ... horizontal placing means A
B ... Sheet folding means B
DESCRIPTION OF SYMBOLS 1 ... Mounting base part 2 ... Elevating mounting base part 3 ... Actuator 11 ... Support part 12 ... Bearing part 13 ... Parallel swing arm 14 ... Parallel swing arm 15 ... Actuating arm 16 ... Actuator 17 ... Actuator 21 ... Movable support part 22 ... Sheet Folded plate 23 ... Stop plate

Claims (6)

  The sheet S can be moved up and down at the front end of the mounting table 1 by placing the sheet folding end S2 connected to the sheet end S1 through the fold a and projecting the sheet S horizontally. Bearings are provided on both sides of a horizontal placing means A provided with a raising / lowering placing table portion 2 provided on the support member 11 and a support portion 11 provided on the opposite side of the sheet folding end portion S2 from above the sheet end portion S1. Two parallel swing arms 13 and 14 that are pivotally supported via a portion 12 and pivotally connected to the lower end portions of the parallel swing arms 13 and 14 and are driven to swing in the front-rear direction via the parallel swing arms 13 and 14. The sheet folding means B is provided with a sheet folding plate 22 integrally attached to the movable support section 21 that can be operated, and the sheet folding end S2 protrudes from the lifting / lowering platform 2 of the horizontal loading means A. Sea placed horizontally The sheet end portion S1 of the sheet S is folded by the lowering operation of the sheet folding means B by the front end corner portion 2a of the elevating and placing table 2 and the tip end portion 22a of the sheet folding plate 22 above the sheet folding end portion S2. Then, the lifting / lowering table 2 is moved downward to form a space on the lower surface of the sheet end S1, and then the sheet folding plate 22 of the sheet folding means B is mounted on the loading table 1. The sheet folding end portion S2 that is bent and moved at right angles is pushed and bent at the tip end portion of the sheet folding plate 22, and between the lower surface of the support portion 11 and the upper surface of the sheet folding plate 22. A sheet end folding apparatus characterized by being sandwiched and folded back to a sheet end S1.   2. A sheet end folding apparatus according to claim 1, wherein a front end portion of a sheet folding plate of said sheet folding means is provided with a downwardly inclined surface.   The sheet end folding apparatus according to claim 1, wherein the sheet S has a single material configuration of a paper layer.   The sheet S has a layer structure of a composite material of a paper layer and a synthetic resin film layer coated or laminated on the front surface or the back surface of the paper layer. The sheet end folding device as described.   The sheet S has a layer structure of a composite material of a paper layer and a synthetic resin film layer laminated on the front surface or the back surface of the paper layer, and is connected to an end S1 of the sheet S through a fold a. 3. The sheet folding end portion S2 provided is formed by extending only a synthetic resin film layer laminated on the front surface or the back surface of the paper layer. The sheet end folding device according to claim 1.   The sheet S has a layer structure of a composite material of a paper layer and a synthetic resin layer coated or laminated on the front surface or the back surface of the paper layer, and the sheet S has an end S1 through a fold a. The continuous sheet folding end portion S2 to be folded is formed by continuously extending the composite material of the paper layer 11 and the synthetic resin layer 12 from the fold a on the outside of the sheet end portion S1. The paper layer 11 extending from the sheet end S1 to the sheet folding end S2 across the fold a is provided with a cutting portion 11a cut to a thickness that is approximately half the thickness. The sheet end folding device according to claim 1, wherein the sheet end folding device is provided.

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