CN116423916A - Folding mechanism for double-sheet carton stapler - Google Patents

Abstract

The invention relates to a folding mechanism for a double-piece carton stapler, which belongs to the technical field of packaging and comprises: the folding guide device comprises a frame, a conveying assembly, a plurality of folding rod assemblies and two folding guide belts, wherein the conveying assembly is rotationally connected to the frame; the folding rod assemblies are divided into two groups, the two groups of folding rod assemblies are fixed on two sides of the frame, and the folding rod assemblies of each group are sequentially lifted along the front end and the rear end of the frame and are sequentially inclined towards the direction close to the conveying assembly; the two folding guide belts are respectively fixed on the two groups of folding rod assemblies. According to the folding guide belt folding machine, the two folding guide belts are respectively fixed on the two groups of folding rod assemblies, each folding guide belt can be sequentially lifted along the front end and the rear end of the machine frame and incline towards the direction close to the conveying assembly, and after the two sides of paper on the conveying belt are contacted with the folding guide belts, the folding guide belts can push the paper to fold along crease lines of the paper.

Description

Folding mechanism for double-sheet carton stapler

Technical Field

The invention relates to the technical field of packaging, in particular to a folding mechanism for a double-sheet carton stapler.

Background

The carton package is widely applied to industries such as food, medicine, chemical industry, daily use and the like, the carton is the most widely applied package product, and bears important responsibility of containing, protecting products and being attractive and tidy, the existing carton is manufactured by not only sealing the carton with glue but also nailing and fixing, and most of the existing nailing machines are of semi-automatic type and need to be operated by holding the nailing machine; even with partially fully automatic carton staplers, the following problems remain: 1. at present, the double-piece spliced paper box still needs to splice and fold corrugated paper manually, and automatic processing and production cannot be realized, so that the investment of productivity is increased, and the production efficiency is seriously influenced; 2. the stapling operation cannot be completed in a high-speed state because the stapling is poor in speed control.

In order to solve the above problems, manufacturers have proposed a two-sheet automatic carton stapler, for example, the following patent numbers: CN112192900B, entitled: the invention relates to a double-sheet high-speed full-automatic carton stapler, wherein a folding mechanism is arranged in a 90-degree rotation way from the starting end to the tail end by utilizing a folding belt and can fold paper along a paper crease line; however, in actual use, the starting end of the folding belt can not support the paper, so that the folding of the paper is affected, and the starting end of the folding belt is arranged in a 90-degree rotation mode from the starting end to the tail end, so that the folding of the paper can not be completed independently without the difference of the height direction, and the folding efficiency of the paper is affected by manual assistance.

Therefore, a folding mechanism for a double-sheet box nailing machine capable of supporting a sheet and rapidly completing folding of the sheet along a crease line of the sheet has been devised, and a problem to be solved is needed by those skilled in the art.

Disclosure of Invention

The invention provides a folding mechanism for a double-piece carton stapler, which solves the technical problems that the existing folding mechanism of the double-piece carton stapler cannot support paper and needs manual auxiliary folding.

The technical scheme for solving the technical problems is as follows, a folding mechanism for a double-sheet carton stapler, comprising:

the machine frame is provided with a machine frame,

the conveying assembly is rotatably connected to the rack and can convey paper with a preset crease along the front end and the rear end of the rack;

the folding rod assemblies are divided into two groups, two groups of folding rod assemblies are respectively fixed on the rack corresponding to two sides of the conveying assembly, the folding rod assemblies of each group are distributed at intervals along the front and rear end directions of the rack, the height of each group of folding rod assemblies is sequentially increased along the front and rear end directions of the rack and sequentially inclined towards the direction close to the conveying assembly, and the lowest folding rod assembly is lower than the paper on the conveying assembly;

the two folding guide belts are respectively fixed on the two groups of folding rod assemblies, and are sequentially lifted along the front end and the rear end directions of the frame and are sequentially inclined towards the direction close to the conveying assembly, and the two folding guide belts are contacted with the two sides of the paper on the conveying belt and can fold the paper along the crease lines.

The beneficial effects of the invention are as follows: the folding guide belts can also be lifted in sequence along the front and rear end directions of the machine frame and incline towards the direction close to the conveying assembly, and after the two sides of paper on the conveying belt are contacted with the folding guide belts, the folding guide belts can push the paper to fold along crease lines of the paper; meanwhile, the lowest folding rod assembly is lower than the paper on the conveying assembly in height, and the lowest point of the folding guide belt is also lower than the paper on the conveying assembly, so that the two sides of the paper can be in smooth contact with the two folding guide belts.

On the basis of the technical scheme, the invention can be improved as follows.

Further, the transfer assembly includes:

the driving rollers are rotationally connected to the rack at intervals along the front and rear end directions of the rack, and the central axes of the driving rollers are perpendicular to the front and rear end directions of the rack;

the conveying belts are respectively connected to the driving rollers in a rolling way and can transport paper with preset folds along the front end and the rear end of the rack; the folding rod assemblies of each group are sequentially inclined towards the direction approaching the conveyor belt; the lowermost folding bar assembly has a height that is lower than the height of the sheets on the conveyor belt.

Further, the frame includes:

fixing the underframe;

the transverse moving screw rod is rotationally connected to the fixed underframe along the direction vertical to the front end and the rear end of the fixed underframe;

the two first movable slats are arranged along the front end and the rear end of the fixed underframe, are connected to the transverse movable screw rod at intervals in a threaded manner and are mutually close to or mutually far away from each other along with the rotation of the transverse movable screw rod; the driving rollers are rotatably connected to the two first movable slats at intervals along the front end and the rear end of the fixed chassis; the two conveyor belts are respectively connected to the driving rollers of the two first movable slats in a rolling manner; the two groups of folding rod assemblies are respectively fixed on the side surfaces of the two first movable slats which are far away from each other and are close to each other or far away from each other along with the two first movable slats.

The driving rollers are rotatably connected to the two first movable slats at intervals, and the two first movable slats can be mutually close to or far away from each other along with the rotation of the transverse movable screw rod, so that the driving rollers and the conveying belts on the two first movable slats can be driven to mutually close to or far away from each other, and the paper with different widths can be transported; meanwhile, as the two groups of folding rod assemblies are respectively fixed on the side surfaces of the two first movable slats, which are far away from each other, the folding mechanism can be suitable for folding paper with different widths.

Further, the frame further comprises:

the two moving frames are respectively fixed on the two first moving laths;

two second movable slats arranged in parallel above the two first movable slats and respectively fixed on the two movable frames

The driven rollers are rotatably connected to the two second movable slats at intervals above the driving rollers, and can be abutted with paper on the two conveyor belts under preset pressure.

The paper conveying device has the further beneficial effects that the stability of conveying paper by the conveying belt can be improved by abutting the driven rollers on the two conveying belts at a preset pressure, and the paper is prevented from shaking randomly when the paper is folded along the crease lines of the paper; meanwhile, the driven rollers are rotationally connected to the second movable slat at intervals, so that the second movable slat can synchronously move with the first movable slat along with the movable frame, and the movable slat can adapt to paper with different widths.

Further, the conveying assembly further comprises a plurality of limiting wheels, the lengths of the two second movable slats are smaller than those of the two first movable slats, the limiting wheels are vertically arranged along the axis of the driving roller and the front end and the rear end of the fixed underframe, the limiting wheels are correspondingly connected to the top surfaces of the two second movable slats in a rolling mode at intervals above the conveying belt, and the limiting wheels can abut against the folded paper to limit the paper to shake.

The paper conveying device has the further beneficial effects that the plurality of limiting wheels are contacted with the folded paper, so that the paper conveyed by the conveying belt can be prevented from shaking, and the conveying continuity and stability of the conveying belt are improved.

Further, the frame further comprises:

the fixed top frame corresponds to the outer sides of the two first movable slats and is fixed on the fixed bottom frame;

the lifting assembly is fixed at the top of the fixed top frame, and the lifting end of the lifting assembly can be lifted or put down;

and the pressing belt is pressed on the paper on the conveyor belt, and one end of the pressing belt is fixed with the lifting end of the lifting assembly.

The paper conveying device has the further beneficial effects that the pressing belt pressed on the paper is lifted or put down through the lifting assembly, when the paper is conveyed by the conveying belt, the pressing belt can be pressed on the paper, the paper conveying stability is improved, and when the nailing machine binds the paper, the pressing belt can be lifted through the lifting assembly, so that the pressing belt is prevented from shielding the nailing position of the nailing machine.

Further, the lifting assembly includes:

the fixed seat is fixed at the top of the fixed top frame;

the lifting cylinder is fixed on the fixed seat, and a piston rod of the lifting cylinder can reciprocate up and down;

the lifting rod is the lifting end of the lifting assembly, the top end of the lifting rod is hinged to the fixing seat, the middle of the lifting rod is hinged to the piston rod of the lifting cylinder, and the pressing belt is fixed to the lifting rod and can synchronously ascend or descend along with the lifting rod.

The lifting rod can be driven to ascend and descend by firstly utilizing the piston rod of the lifting cylinder to ascend and descend; and then the pressing belt is fixed on the lifting rod, so that the pressing belt can be synchronously driven to ascend and descend.

Further, the folding bar assembly includes

An extension bar fixed to a side surface of one of the first moving laths away from the other first moving lath in a front-rear end direction perpendicular to the fixed chassis;

the vertical rods are vertically fixed on the extension rods, the vertical rods of each group of a plurality of folding rod assemblies are sequentially lifted along the front end and the rear end directions of the fixed underframe, and the lowest vertical rod is lower than the paper on the conveying belt;

the cross rod is vertically fixed on the vertical rod;

the inclined rods are fixed at one end of the cross rod, which is close to the conveyor belt, and the inclined rods of the folding rod assemblies of each group are inclined towards the conveyor belt in sequence along the front end and the rear end directions of the fixed underframe; the folding guide belt is fixed to a plurality of the inclined bars of the folding bar assembly of a group.

The adoption of the folding rod assembly has the further beneficial effects that the upright rods of the folding rod assemblies in each group are firstly utilized to be sequentially lifted along the front end and the rear end directions of the fixed underframe, so that the heights of the folding rod assemblies can be sequentially lifted along the paper conveying direction; the inclined rods of the folding rod assemblies of each group are inclined towards the direction of the conveying belt in sequence along the front end and the rear end directions of the fixed underframe, so that paper can be gradually pushed towards the inner side of the conveying belt along the paper conveying direction, and the paper can be folded along crease lines of the paper conveniently.

Further, the folding bar assembly further comprises two reinforcing bars, wherein the two reinforcing bars are arranged along the front end and the rear end directions of the fixed underframe and are respectively fixed on the extension bars of the two groups of a plurality of folding bar assemblies.

The folding rod assembly has the further beneficial effects that the stability of a plurality of extension rods can be improved by fixing the reinforcing rods on the extension rods of a group of folding rod assemblies.

In addition, there is provided a double-piece carton stapler comprising: the paper feeding device comprises a front edge paper feeding mechanism, a primary box nailing mechanism, a paper receiving mechanism, a folding mechanism, a correction mechanism and a secondary box nailing mechanism, wherein the front edge paper feeding mechanism, the primary box nailing mechanism, the paper receiving mechanism, the folding mechanism, the correction mechanism, a paper feeding port and a paper discharging port of the secondary box nailing mechanism are sequentially connected in series.

Drawings

FIG. 1 is a schematic diagram showing a front perspective view of a folding mechanism for a double-piece carton stapler of the present invention;

FIG. 2 is an enlarged schematic view of a portion of FIG. 1A;

FIG. 3 is a rear perspective view of a folding mechanism for a two-piece carton stapler of the present invention;

FIG. 4 is an enlarged schematic view of a portion of FIG. 3B;

FIG. 5 is an enlarged schematic view of a portion of FIG. 3C;

fig. 6 is a schematic perspective view of a double-sheet carton stapler according to the present invention.

In the drawings, the list of components represented by the various numbers is as follows:

1. the device comprises a frame, 11, a fixed underframe, 12, a transverse moving screw rod, 13, a first movable slat, 14, a movable frame, 15, a second movable slat, 16, a driven roller, 17, a limit wheel, 18, a fixed top frame, 19, a lifting component 191, a fixed seat, 192, a lifting cylinder, 193, a lifting rod,

2. a driving roller wheel, 3 and a conveying belt,

3. folding bar assembly 41, extension bar, 42, upright bar, 43, cross bar, 44, tilt bar,

5. reinforcing rod 6, compressing belt 7, front edge paper feeding mechanism 8, primary nailing mechanism 9, paper receiving mechanism 10, correcting mechanism 20, secondary nailing mechanism 21, folding guide belt.

Detailed Description

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

As shown in fig. 1-6, a folding mechanism for a two-piece carton stapler, comprising:

the machine frame 1 is provided with a plurality of machine frames,

a conveying assembly rotatably connected to the frame 1 and capable of conveying a sheet having a predetermined crease in a front-rear end direction of the frame 1;

the folding rod assemblies 4 are divided into two groups, two sides of each folding rod assembly 4 corresponding to the conveying assembly are respectively fixed on the frame 1, the folding rod assemblies 4 of each group are distributed at intervals along the front end and the rear end of the frame 1, the height of each folding rod assembly 4 of each group is sequentially raised along the front end and the rear end of the frame 1 and sequentially inclined towards the direction close to the conveying assembly, and the height of the lowest folding rod assembly 4 is lower than the height of paper on the conveying assembly;

the two folding guide belts 21 are respectively fixed on the two groups of the folding rod assemblies 4, and sequentially lift up along the front and rear end directions of the frame 1 and sequentially incline towards the direction close to the conveying assembly, and the two folding guide belts 21 are contacted with two sides of the paper on the conveying belt 3 and fold the paper along the crease line positions of the paper.

In some particular embodiments, the transfer assembly may include:

the driving rollers 2 are rotationally connected to the frame 1 at intervals along the front and rear end directions of the frame 1, and the central axes of the driving rollers 2 are perpendicular to the front and rear end directions of the frame 1;

the conveyor belts 3, the conveyor belts 3 are respectively connected on the plurality of driving rollers 2 in a rolling way and can transport the paper with the preset crease along the front end and the rear end directions of the frame 1; the plurality of folding bar assemblies 4 of each group are inclined in turn in a direction approaching the conveyor belt 3; the lowest folding bar assembly 4 is at a lower level than the paper on the conveyor belt 3.

In some specific embodiments, the rack 1 may include:

a fixed chassis 11;

a lateral moving screw 12, the lateral moving screw 12 being rotatably connected to the fixed chassis 11 in the front-rear direction of the vertical fixed chassis 11;

the two first movable slats 13 are arranged along the front end and the rear end of the fixed chassis 11, and the two first movable slats 13 are connected to the transverse movable screw 12 at intervals in a threaded manner and are close to or far from each other along with the rotation of the transverse movable screw 12; a plurality of driving rollers 2 are rotatably connected to the two first movable slats 13 at intervals along the front and rear end directions of the fixed chassis 11; the conveyor belt 3 is two and is respectively connected with a plurality of driving rollers 2 of the two first movable slats 13 in a rolling way; the two sets of folding bar assemblies 4 are respectively fixed to the sides of the two first moving slats 13 remote from each other and are moved closer to each other or away from each other with the two first moving slats 13.

In some specific embodiments, the rack 1 may further comprise:

two moving frames 14, the two moving frames 14 are fixed on the two first moving laths 13 respectively;

two second movable slats 15, the two second movable slats 15 are arranged in parallel above the two first movable slats 13 and are respectively fixed on the two movable frames 14

The plurality of driven rollers 16 are rotatably connected to the two second moving slats 15 corresponding to the plurality of driving rollers 2 at intervals above the plurality of driven rollers 16, and the plurality of driven rollers 16 can abut against the paper on the two conveyor belts 3 at a predetermined pressure.

In some specific embodiments, the conveying assembly may further include a plurality of limiting wheels 17, the lengths of the two second moving slats 15 are smaller than the lengths of the two first moving slats 13, the plurality of limiting wheels 17 are vertically arranged along the axes of the plurality of driving rollers 2 and the front and rear end directions of the fixed chassis 11, the plurality of limiting wheels 17 are in rolling connection with the top surfaces of the two second moving slats 15 corresponding to the upper space of the two conveying belts 3, and the plurality of limiting wheels 17 can collide with the folded paper to limit the paper from shaking.

In some specific embodiments, the rack 1 may further comprise:

a fixed top frame 18, the outer sides of the fixed top frame 18 corresponding to the two first movable slats 13 are fixed on the fixed bottom frame 11;

a lifting assembly 19, the lifting assembly 19 is fixed on the top of the fixed top frame 18 and the lifting end thereof can be lifted or put down;

the pressing belt 6 presses the paper on the conveyor belt 3 and one end of the pressing belt 6 is fixed with the lifting end of the lifting assembly 19.

In some particular embodiments, the lift assembly 19 may include:

the fixing seat 191 is fixed on the top of the fixed top frame 18;

a lifting cylinder 192, the lifting cylinder 192 being fixed to the fixing seat 191 and having a piston rod reciprocally movable up and down;

the lifting rod 193, the lifting rod 193 is the lifting end of the lifting assembly 19, the top end of the lifting rod 193 is hinged on the fixing seat 191, the middle part of the lifting rod 193 is hinged on the piston rod of the lifting cylinder 192, and the pressing belt 6 is fixed on the lifting rod 193 and can synchronously ascend or descend along with the lifting rod 193.

In some particular embodiments, folding bar assembly 4 may include

An extension bar 41 fixed to a side surface of one first moving slat 13 away from the other first moving slat 13 in a front-rear end direction of the vertical fixing chassis 11;

the upright posts 42, the upright posts 42 are vertically fixed on the extension bars, the upright posts 42 of the plurality of folding bar assemblies 4 of each group are sequentially raised along the front and rear end directions of the fixed underframe 11, and the height of the lowest upright post 42 is lower than the paper on the conveyor belt 3;

the cross rod 43, the cross rod 43 is vertically fixed on the upright rod 42;

the inclined rods 44, the inclined rods 44 are fixed at an angle to one end of the cross rod 43 near the conveyor belt 3, and the inclined rods 44 of the plurality of folding rod assemblies 4 of each group are inclined in the direction of the conveyor belt 3 in turn along the front and rear end directions of the fixed chassis 11; the folding guide belt 21 is fixed to a plurality of inclined bars 44 of the folding bar assembly 4 of a group.

In some specific embodiments, two reinforcing bars 5 may be further included, and the two reinforcing bars 5 are each disposed along the front-rear end direction of the fixed chassis 11 and are respectively fixed to the extension bars 41 of the two sets of the plurality of folding bar assemblies 4.

In addition, there is provided a double-piece carton stapler comprising: the front edge paper feeding mechanism 7, the primary carton nailing mechanism 8, the paper receiving mechanism 9, the folding mechanism, the correction mechanism 10 and the secondary carton nailing mechanism 20 are sequentially connected in series, and the paper feeding ports and the paper outlet ports of the front edge paper feeding mechanism 7, the primary carton nailing mechanism 8, the paper receiving mechanism 9, the folding mechanism, the correction mechanism 10 and the secondary carton nailing mechanism 20 are sequentially connected in series.

The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.

Claims (10)

1. Folding mechanism for biplate carton stapler, characterized by comprising:

a frame (1),

a conveying assembly rotatably connected to the frame (1) and capable of conveying a sheet having a predetermined crease in a front-rear end direction of the frame (1);

the folding rod assemblies (4) are divided into two groups, the two groups of folding rod assemblies (4) are respectively fixed on the frame (1) corresponding to the two sides of the conveying assembly, the folding rod assemblies (4) of each group are distributed at intervals along the front end and the rear end directions of the frame (1), the heights of the folding rod assemblies (4) of each group are sequentially raised along the front end and the rear end directions of the frame (1) and are sequentially inclined towards the direction close to the conveying assembly, and the height of the lowest folding rod assembly (4) is lower than the height of paper on the conveying assembly;

the folding guide belts (21) are respectively fixed on a plurality of folding rod assemblies (4) of the two groups, and are sequentially lifted along the front end direction and the rear end direction of the frame (1) and are sequentially inclined towards the direction close to the conveying assembly, and the two folding guide belts (21) are contacted with two sides of the paper on the conveying belt (3) and are used for folding the paper along the crease line positions of the paper.

2. The folding mechanism for a two-piece carton stapler of claim 1, wherein the transfer assembly comprises:

the driving rollers (2) are rotationally connected to the frame (1) at intervals along the front and rear end directions of the frame (1), and the central axes of the driving rollers (2) are perpendicular to the front and rear end directions of the frame (1);

the conveyor belts (3) are respectively connected to the driving rollers (2) in a rolling way and can transport paper with preset folds along the front end and the rear end directions of the stand (1); -each group of a plurality of said folding bar assemblies (4) being inclined in sequence in a direction approaching said conveyor belt (3); the lowest folding bar assembly (4) has a lower height than the paper on the conveyor belt (3).

3. Folding mechanism for a double-piece carton stapler according to claim 2, characterized in that said frame (1) comprises:

a fixed chassis (11);

a lateral movement screw (12), wherein the lateral movement screw (12) is rotationally connected to the fixed underframe (11) along the direction vertical to the front end and the rear end of the fixed underframe (11);

the two first movable slats (13) are arranged along the front end and the rear end directions of the fixed underframe (11), and the two first movable slats (13) are connected to the transverse movable screw (12) at intervals in a threaded manner and are close to or far away from each other along with the rotation of the transverse movable screw (12); the driving rollers (2) are rotatably connected to the two first movable slats (13) at intervals along the front and rear end directions of the fixed underframe (11); the conveyor belt (3) is two and is respectively connected to the driving rollers (2) of the two first movable slats (13) in a rolling way; the two groups of folding rod assemblies (4) are respectively fixed on the side surfaces of the two first movable slats (13) which are far away from each other and are close to each other or far away from each other along with the two first movable slats (13).

4. A folding mechanism for a two-piece carton stapler according to claim 3, characterized in that said frame (1) further comprises:

two moving frames (14), wherein the two moving frames (14) are respectively fixed on the two first moving laths (13);

two second movable slats (15), wherein the two second movable slats (15) are arranged above the two first movable slats (13) in parallel and are respectively fixed on the two movable frames (14)

The driven rollers (16) are rotatably connected to the two second movable slats (15) at intervals above the driving rollers (2) corresponding to the driven rollers (16), and the driven rollers (16) can be abutted against paper on the two conveying belts (3) under preset pressure.

5. The folding mechanism for a double-sheet carton stapler according to claim 4, wherein the conveying assembly further comprises a plurality of limiting wheels (17), the lengths of the two second moving slats (15) are smaller than those of the two first moving slats (13), the plurality of limiting wheels (17) are vertically arranged along the axis of the driving roller (2) and the front and rear end directions of the fixed underframe (11), the plurality of limiting wheels (17) are in rolling connection with the top surfaces of the two second moving slats (15) corresponding to the upper space of the two conveying belts (3), and the plurality of limiting wheels (17) can collide with the folded paper to limit the paper from shaking.

6. A folding mechanism for a two-piece carton stapler according to claim 3, characterized in that said frame (1) further comprises:

a fixed top frame (18), wherein the fixed top frame (18) is fixed on the fixed bottom frame (11) corresponding to the outer sides of the two first movable slats (13);

the lifting assembly (19) is fixed on the top of the fixed top frame (18), and the lifting end of the lifting assembly (19) can be lifted or put down;

and the pressing belt (6) is pressed on the paper on the conveyor belt (3), and one end of the pressing belt (6) is fixed with the lifting end of the lifting assembly (19).

7. A folding mechanism for a two-piece carton stapler according to claim 6, characterized in that said lifting assembly (19) comprises:

the fixed seat (191) is fixed at the top of the fixed top frame (18);

the lifting cylinder (192) is fixed on the fixing seat (191) and the piston rod of the lifting cylinder (192) can reciprocate up and down;

the lifting rod (193) is the lifting end of the lifting assembly (19), the top end of the lifting rod (193) is hinged to the fixing seat (191) and the middle of the lifting rod is hinged to a piston rod of the lifting cylinder (192), and the pressing belt (6) is fixed on the lifting rod (193) and can synchronously ascend or descend along with the lifting rod (193).

8. A folding mechanism for a two-piece carton stapler according to claim 3, characterized in that said folding bar assembly (4) comprises

An extension rod (41) fixed to a side surface of one of the first moving laths (13) away from the other first moving lath (13) in a direction perpendicular to the front-rear end direction of the fixed chassis (11);

-a vertical rod (42), said vertical rod (42) being vertically fixed to said extension rod, said vertical rods (42) of each group of a plurality of said folding rod assemblies (4) being raised in succession in the direction of the front and rear ends of said fixed chassis (11), the height of the lowest vertical rod (42) being lower than said sheet on said conveyor belt (3);

the cross rod (43) is vertically fixed on the upright (42);

-a tilting bar (44), said tilting bar (44) being fixed at an angle to one end of said cross bar (43) near said conveyor belt (3), said tilting bar (44) of each set of a plurality of said folding bar assemblies (4) being tilted in sequence in the direction of said conveyor belt (3) along the front-rear end direction of said fixed chassis (11); the folding guide belt (21) is fixed to a plurality of the inclined bars (44) of the folding bar assembly (4) of a group.

9. A folding mechanism for a double-sheet box nailing machine according to claim 8, characterized by further comprising two reinforcing bars (5), both of the reinforcing bars (5) being arranged in the front-rear end direction of the fixed chassis (11) and being fixed to the extension bars (41) of two sets of a plurality of the folding bar assemblies (4), respectively.

10. A two-piece carton stapler, comprising: front edge paper feeding mechanism (7), once nail case mechanism (8), connect paper mechanism (9), folding mechanism, correction mechanism (10) and secondary nail case mechanism (20) according to claim 1-9, front edge paper feeding mechanism (7) once nail case mechanism (8) connect paper mechanism (9) folding mechanism correction mechanism (10) with the feed mouth and the exit slot of secondary nail case mechanism (20) connect gradually in series.

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