CN114347554A - A carton forming and bending machine - Google Patents

Abstract

The invention discloses a carton forming and bending machine which comprises a paperboard supply device and a paperboard unfolding and bottom sealing device, wherein the paperboard unfolding and bottom sealing device is provided with a paperboard inlet and a paperboard outlet, the paperboard supply device is provided with a paperboard outlet, the paperboard outlet of the paperboard supply device is close to the paperboard inlet of the paperboard unfolding and bottom sealing device, the paperboard supply device is used for conveying carton folded plates to the paperboard unfolding and bottom sealing device one by one, the paperboard unfolding and bottom sealing device is used for unfolding the carton folded plates and sealing the bottom of the carton folded plates into a carton, and the carton forming and bending machine is simple in structure, flexible to operate and high in processing efficiency.

Description

A carton forming and bending machine

technical field

The invention belongs to the field of carton forming equipment, in particular to a carton forming and bending machine.

Background technique

As the simplest packaging product at present, the carton is low in cost and is a recyclable resource. However, in order to reduce the space occupied by the empty carton during transportation, the carton is stored in the carton during transportation. It is transported in the form of a folded plate, and the carton folded plate is unfolded into a carton shape before use. However, the working efficiency of the current carton forming machine is low and the structure is relatively complex.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the purpose of the present invention is to provide a carton forming and bending machine with simple structure and high production efficiency.

In order to achieve the above objects, the technical solutions of the present invention are as follows: a carton forming and bending machine, comprising a cardboard supply device and a cardboard unfolding bottom cover device, the cardboard unfolding and bottom cover device has a cardboard inlet and a carton outlet, and the cardboard supply device has a cardboard outlet, the cardboard outlet of the cardboard supply device is close to the cardboard inlet of the cardboard unfolding and bottom cover device, the cardboard supply device is used to transport the carton flaps one by one to the cardboard unfolding and bottom sealing device, and the cardboard unfolding and back cover device It is used for unfolding the folding board of the carton and sealing the back to form a carton.

In the above technical solution, the cardboard supply device includes a frame body, a support rod, a first gauge plate, a push plate, a first driving member, a second driving member and a paper separating member, and the frame body is inclined along the front-rear direction. And its rear end is inclined downward, the left side of the frame body is vertically provided with a second gauge plate along the front-rear direction, the support rod is arranged in the middle of the frame body along the front-rear direction, and the support rod is arranged in the middle of the frame body. The front and rear ends are respectively connected and fixed with the frame body, the push plate is vertically arranged along the left-right direction and is slidably installed on the support rod, the first driving member is installed on the support rod, and is connected with the support rod. Push plate transmission connection, the first driving member is used to push the push plate to move along the front and rear directions on the support rod, and the first gauge plate is vertically arranged on the right side of the support rod along the front and rear direction. , and the front and rear ends of the first reclining plate are respectively slidably connected with the front and rear ends of the frame body, the second driving member is installed on the frame body, and its driving end is connected to the first The gauge plate moves in the left-right direction, the paper separator is suspended above the rear end of the frame body, and the first and second gauge plates are located in the area of the push plate and are stacked in the front-rear direction. There are a plurality of carton folding boards vertically arranged along the left and right directions, and the paper separating member is used to separate the rearmost carton folding board to the cardboard unfolding bottom cover device.

In the above technical solution, the first driving member is an electric linear module.

In the above technical solution, the second driving member includes a screw rod and a hand wheel, the screw rod is arranged in the middle of the frame body along the left-right direction, the left end of the screw rod is rotatably connected with the support rod, and the screw rod is rotatably connected to the support rod. The right end of the rod is rotatably connected to the right end of the frame body, and the right end of the screw rod penetrates out of the frame, and the handwheel is coaxially fixed on the right end of the screw rod. The middle part penetrates the first gauge plate and is threadedly connected with the first gauge plate, and the hand wheel is rotated to drive the first gauge plate to move left and right.

In the above technical solution, the paper separator includes a mounting rod, a conical shifting tooth and two hook plates, the mounting bar is horizontally arranged above the rear end of the frame body along the left-right direction, and the conical shifting tooth is installed vertically. At the lower end of the mounting rod, with its conical tip facing downward, the two hook plates are respectively installed under the mounting rod and on the left and right sides of the conical shifting teeth, and the two hooks The hook openings of the plate are all facing the front and the bottom, and the two hook plates are respectively used to hook the rear sides of the left and right sides of the upper end of the carton folding plate, and the lower ends of the tapered teeth are used to extend into the paper box. The inner middle of the box flap.

In the above technical solution, the cardboard unfolding and bottom cover device includes a casing and a deflector, a third driving member, a suction cup assembly, a fourth driving member and two half-folding assemblies arranged in the casing, and the cardboard inlet is provided at the On the front side of the casing, there are two baffles, and the two baffles are horizontally arranged in the casing near the cardboard inlet in the front-rear direction, and are located in the casing. The inner edge is left and right, and the two air guide plates are distributed in an "eight" shape, the suction cup assembly is installed in the casing through a fourth driving member, and the suction ports of the suction cup assembly The fourth driving member is used for driving the suction cup assembly to move back and forth to pull the carton folded plate at the cardboard outlet of the cardboard supply device into the casing, and together with the paper separation member, the carton folded plate is moved It is unfolded into an up-and-down rectangular shape, and the two half-folding components are used to bend the four sides of the lower end of the unfolded carton folding plate inward to form a carton. The left or right side of the casing is The carton outlet is provided on the side, and the baffle plate away from the carton outlet is installed on the casing through the third driving member, and the third driving member is used to drive the corresponding baffle plate Move close to the other of the baffles to push the carton out through the carton outlet.

In the above technical solution, the suction cup assembly includes a mounting plate and a plurality of suction cups. The mounting plate is vertically arranged along the left-right direction. The driving end of the fourth driving member is connected with the rear side of the mounting plate.

In the above technical solution, the two half-folding components are respectively a first half-folding component and a second half-folding component. The first half-folding component includes two first half-folding actuators arranged at intervals along the left and right directions. The first half-folding actuators Including a rotating cylinder and a swing rod, the rotating cylinder is arranged horizontally, and its driving end faces forward or backward, and the swing rod is vertically arranged, and its upper end is connected and fixed with the driving end corresponding to the rotating cylinder, and the two The rotating cylinder is used to drive the two swing rods to swing left and right to be close to each other to bend the cover edges on the left and right sides of the unfolded lower end of the carton folding plate inward to horizontal, or to move away from each other to reset, The second half-folding assembly is used to fold the cover edges on the front and rear sides of the lower end of the unfolded carton folding plate inward to a horizontal level.

In the above technical solution, the second half-folding assembly includes a mounting seat, two telescopic cylinders, two rocker arms and two idler rollers. In the middle of the room, one end of the two rocker arms is connected to the mounting seat for front and rear swing, and the two telescopic cylinders are installed in the casing and correspond to the two rocker arms one by one, and the two The telescopic ends of the telescopic cylinders are respectively connected with the corresponding middle parts in the longitudinal direction of the rocker arm. The rocker arms are in one-to-one correspondence, and the other end of each rocker arm is connected and fixed with the corresponding roller, and the two telescopic cylinders are used to drive the two rocker arms to swing to the two rollers Move to be close to each other to bend the cover edges on the front and rear sides of the lower end of the unfolded carton folding plate inwards to be horizontal, or move away from each other to reset.

The beneficial effect of the present invention is that the structure is simple, and the stacks of carton folded plates can be transported to the cardboard unfolding and back cover device one by one, and the rearmost carton folded plates are jointly transferred to the casing by the suction cup assembly and the paper separating member. Internal conveying, while pulling the folding plate of the carton to unfold, and then bending the four flanges at the lower end of the carton inward by the two half-folding components respectively, so that the folding plate of the carton is finally processed into a carton shape. The two driving members can flexibly adjust the distance between the first gauge plate and the second gauge plate, so that they can process cartons of different specifications. In addition, the two half-folding components in this embodiment are simple in structure, And flexible control.

Description of drawings

1 is an elevation view of a carton forming and bending machine provided by an embodiment of the present invention;

Fig. 2 is another vertical view of the carton forming and bending machine provided by the embodiment of the present invention;

3 is a schematic structural diagram of a first half-folding actuator in an embodiment of the present invention;

4 is a schematic structural diagram of a second half-folding actuator in an embodiment of the present invention;

5 is a schematic structural diagram of a fourth driving mechanism and a suction cup assembly in an embodiment of the present invention;

FIG. 6 is a diagram of the cooperation between the paper separating member and the suction cup assembly in the embodiment of the present invention.

In the figure: 1 cardboard supply device, 11 frame, 12 support rod, 13 first gauge plate, 14 push plate, 15 first drive member, 16 second drive member, 161 screw rod, 162 hand wheel, 17 paper separation Parts, 171 Mounting Rod, 172 Conical Picking Teeth, 173 Hook Plate, 18 Second Gauge Plate, 2 Cardboard Unfolding Back Cover Device, 21 Cabinet, 22 Deflector, 23 Third Drive, 24 Suction Cup Assembly, 241 Installation Plate, 242 Suction Cup, 25 Fourth Drive, 26 Half Folding Assembly, 261 First Half Folding Actuator, 2611 Rotary Air Cylinder, 2612 Swing Rod, 262 Mounting Seat, 263 Telescopic Cylinder, 264 Rocker Arm, 265 Roller, 3 Carton Folding plate.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples are only used to explain the present invention, but not to limit the scope of the present invention.

As shown in Figures 1-6, this embodiment provides a carton forming and bending machine, including a cardboard supply device 1 and a cardboard unfolding and bottom cover device 2, the cardboard unfolding and bottom cover device 2 has a cardboard inlet and a carton outlet, so The cardboard supply device 1 has a cardboard outlet, and the cardboard outlet of the cardboard supply device 1 is close to the cardboard inlet of the cardboard unfolding and back cover device 2, and the cardboard supply device 1 is used to convey the carton flaps 3 to the cardboard one by one. Unfolding the back cover device 2, the cardboard unfolding back cover device 2 is used to unfold the carton folding board 3 and seal the back into a carton.

In the above technical solution, the cardboard supply device 1 includes a frame body 11, a support rod 12, a first gauge plate 13, a push plate 14, a first driving member 15, a second driving member 16 and a paper separating member 17. The frame body 11 is inclined along the front-rear direction, and its rear end is inclined downward, the left side of the frame body 11 is vertically provided with a second gauge plate 18 along the front-rear direction, and the support rod 12 is arranged in the front-rear direction. The middle part of the frame body 11, and the front and rear ends of the support rod 12 are respectively connected and fixed with the frame body 11, and the push plate 14 is vertically arranged along the left-right direction and slidably installed on the support rod 12, so The first driving member 15 is installed on the support rod 12 and is connected with the push plate 14 in a driving manner. The first driving member 15 is used to push the push plate 14 on the support rod 12 in the front-rear direction Moving, the first gauge plate 13 is vertically arranged on the right side of the support rod 12 along the front-rear direction, and the front and rear ends of the first gauge plate 13 are respectively connected with the front and rear ends of the frame body 11 Sliding connection, the second driving member 16 is installed on the frame body 11, and its driving end and the first gauge plate 13 move in the left-right direction, and the paper separating member 17 is suspended on the frame body 11 Above the rear end, a plurality of carton folding plates 3 vertically arranged in the left and right directions are stacked in the area of the push plate 14 between the first and second gauge plates 13 and 18. , the paper separating member 17 is used to separate the rearmost carton folding plate 3 to the cardboard unfolding and bottom cover device 2 .

In the above technical solution, the first driving member 15 is an electric linear module.

In the above technical solution, the second driving member 16 includes a screw rod 161 and a hand wheel 162, the screw rod 161 is arranged in the middle of the frame body 11 along the left-right direction, and the left end of the screw rod 161 is connected to the support rod. 12 Rotationally connected, the right end of the screw rod 161 is connected with the right end of the frame body 11 in rotation, and the right end of the screw rod 161 protrudes out of the frame body 11, and the handwheel 162 is coaxially fixed and installed At the right end of the screw rod 161, the middle part of the screw rod 161 penetrates the first gauge plate 13 and is threadedly connected with the first gauge plate 13, and the hand wheel 162 is rotated to drive the first gauge plate 13. Relying on the gauge plate 13 to move left and right.

In the above technical solution, the paper separating member 17 includes a mounting rod 171, a conical shifting tooth 172 and two hook plates 173. The mounting rod 171 is horizontally arranged above the rear end of the frame body 11 along the left-right direction. The shaped shifting teeth 172 are vertically installed on the lower end of the mounting rod 171 with the conical tip facing downward. The two hook plates 173 are respectively installed under the mounting rod 171 and located on the conical shifting teeth 172 The left and right sides of the two hook plates 173 are both facing forward and downward, and the two hook plates 173 are respectively used to hook the rear sides of the left and right sides of the upper end of the carton folding plate 3. The lower end of the tapered teeth 172 is used to extend into the inner middle of the folding plate 3 of the carton box.

In the above technical solution, the cardboard unfolding and bottom cover device 2 includes a casing 21 and a deflector 22, a third driving member 23, a suction cup assembly 24, a fourth driving member 25 and two half-folding assemblies arranged in the casing 21. 26. The cardboard inlet is arranged on the front side of the casing 21, and there are two baffles 22. The two baffles 22 are horizontally arranged in the casing 21 along the front and rear directions. The position of the cardboard inlet is along the left and right sides in the casing 21, and the two deflectors 22 are distributed in the shape of "eight". The suction cup assembly 24 is installed on the Inside the shell 21, and the suction ports of the suction cup assembly 24 are all facing forward, the fourth driving member 25 is used to drive the suction cup assembly 24 to move back and forth to fold the carton 3 at the cardboard outlet of the cardboard supply device 1 It is pulled into the casing 21, and together with the paper separating member 17, the carton folding plate 3 is unfolded into a rectangular shape that penetrates up and down. The two half-folding components 26 are used to separate the unfolded carton The four sides of the lower end of the folding plate 3 are bent inward to form a carton, the left or right side of the casing 21 is provided with the carton outlet, and the deflector 22 away from the carton outlet passes through the box. The third driving member 23 is installed on the casing 21 , and the third driving member 23 is used to drive the corresponding deflector 22 to move close to the other deflector 22 to remove the carton from the carton. Pushed out through the carton outlet. Wherein, both the third driving member and the fourth driving member can adopt a telescopic electric cylinder.

Wherein, the fourth driving member drives the suction cup assembly to move forward to attract the carton folding plate located at the rear left of the cardboard supply device, pull it backwards, and unfold it under the action of the paper separating member. The opened carton flap is sucked into the casing, and the two half-folding assemblies start to operate to bend the four sides of the lower end of the unfolded carton flap to the horizontal level so that the lower end of the unfolded carton flap is After closing, the forming of the carton is completed, and then the suction cup releases the carton, and the corresponding deflector is driven by the third driving member to push the carton out of the casing.

In the above technical solution, the suction cup assembly 24 includes a mounting plate 241 and a plurality of suction cups 242, the mounting plate 241 is vertically arranged along the left-right direction, and the plurality of suction cups 242 are installed on the front side of the mounting plate 241 at intervals, and The suction port faces forward, and the driving end of the fourth driving member 25 is connected to the rear side of the mounting plate 241 .

In the above technical solution, the two half-folding components 26 are respectively a first half-folding component and a second half-folding component. The actuator 261 includes a rotating cylinder 2611 and a swing rod 2612 (wherein, the driving end of the rotating cylinder can be rotated 90° to horizontal each time, or reversely rotated 90° to vertical), the rotating cylinder 2611 is arranged horizontally, and it drives The end faces forward or backward, the swing rod 2612 is vertically arranged, and its upper end is connected and fixed with the driving end corresponding to the rotating cylinder 2611 , and the two rotating cylinders 2611 are used to drive the two swing rods 2612 Swing left and right to be close to each other to fold the lid edges on the left and right sides of the lower end of the unfolded carton folding plate 3 inward to horizontal, or move away from each other to reset. The cover edges on the front and rear sides of the lower end of the carton folding plate 3 are bent inwards to be horizontal.

In the above technical solution, the second half-folding assembly includes a mounting seat 262, two telescopic cylinders 263, two rocker arms 264 and two idler rollers 265. In the middle part between the two swing rods 2612, one end of the two rocker arms 264 is connected with the mounting seat 262 to swing forward and backward, and the two telescopic cylinders 263 are installed in the casing 21 and are connected with the two Each of the rocker arms 264 is in one-to-one correspondence, and the telescopic ends of the two telescopic cylinders 263 (electrical telescopic cylinders can be used) are respectively connected to the corresponding middle parts of the rocker arms 264 in the length direction. 265 are arranged horizontally along the left and right directions, and are distributed at intervals along the front and rear directions. The two idlers 265 correspond to the two rocker arms 264 one-to-one, and the other end of each rocker arm 264 corresponds to the idler 265 is connected and fixed, and the two telescopic cylinders 263 are used to drive the two rocker arms 264 to swing until the two idler rollers 265 move to be close to each other, so that the unfolded lower end of the carton folding plate 3 can be closed. The lid edges are bent inward to level, or away from each other to reset.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection of the present invention. within the range.

Claims (9)

1. A carton forming and bending machine, characterized by comprising a paperboard supply device (1) and a paperboard unfolding and bottom sealing device (2), wherein the paperboard unfolding and bottom sealing device (2) is provided with a paperboard inlet and a paperboard outlet, the paperboard supply device (1) is provided with a paperboard outlet, the paperboard outlet of the paperboard supply device (1) is close to the paperboard inlet of the paperboard unfolding and bottom sealing device (2), the paperboard supply device (1) is used for conveying carton folded plates (3) to the paperboard unfolding and bottom sealing device (2) one by one, and the paperboard unfolding and bottom sealing device (2) is used for unfolding and bottom sealing the carton folded plates (3) into cartons.

2. The carton forming and bending machine according to claim 1, wherein the cardboard supply device (1) comprises a frame body (11), a support rod (12), a first support plate (13), a push plate (14), a first driving member (15), a second driving member (16) and a paper separating member (17), the frame body (11) is arranged obliquely along the front-back direction, the rear end of the frame body inclines downwards, the left side of the frame body (11) is vertically provided with a second support plate (18) along the front-back direction, the support rod (12) is arranged in the middle of the frame body (11) along the front-back direction, the front end and the rear end of the support rod (12) are respectively connected and fixed with the frame body (11), the push plate (14) is vertically arranged along the left-right direction and is slidably mounted on the support rod (12), the first driving member (15) is mounted on the support rod (12) and is in transmission connection with the push plate (14), the first driving piece (15) is used for pushing the push plate (14) to move on the supporting rod (12) along the front-back direction, the first gauge leaning plate (13) is vertically arranged on the right side of the supporting rod (12) along the front-back direction, the front end and the rear end of the first gauge plate (13) are respectively connected with the front end and the rear end of the frame body (11) in a sliding way, the second driving piece (16) is arranged on the frame body (11), the driving end of the paper separating piece moves along the left-right direction with the first gauge plate (13), the paper separating piece (17) is suspended above the rear end of the frame body (11), a plurality of carton folded plates (3) which are vertically arranged along the left-right direction are overlapped between the first gauge-leaning plate (13) and the second gauge-leaning plate (18) in the region of the push plate (14) along the front-back direction, the paper separating piece (17) is used for separating the rearmost carton folded plate (3) to the carton unfolding bottom sealing device (2).

3. The carton forming and bending machine according to claim 2, wherein the first drive member (15) is an electric linear die set.

4. The carton forming and bending machine according to claim 2, wherein the second driving member (16) comprises a screw rod (161) and a hand wheel (162), the screw rod (161) is arranged in the middle of the frame body (11) along the left-right direction, the left end of the screw rod (161) is rotatably connected with the supporting rod (12), the right end of the screw rod (161) is rotatably connected with the right end of the frame body (11), the right end of the screw rod (161) penetrates out of the frame body (11), the hand wheel (162) is coaxially and fixedly installed at the right end of the screw rod (161), the middle of the screw rod (161) penetrates through the first gauge plate (13) and is in threaded connection with the first gauge plate (13), and the hand wheel (162) is rotated to drive the first gauge plate (13) to move left and right.

5. The carton forming and bending machine according to any one of claims 1 to 4, the paper separating piece (17) comprises a mounting rod (171), a conical shifting tooth (172) and two hook plates (173), the mounting rod (171) is horizontally arranged above the rear end of the frame body (11) along the left-right direction, the conical shifting teeth (172) are vertically arranged at the lower end of the mounting rod (171), the conical tips of the two hook plates (173) are downward, the two hook plates are respectively arranged below the mounting rod (171), and are positioned at the left and right sides of the conical shifting teeth (172), the hook openings of the two hook plates (173) face to the front lower part, the two hook plates (173) are respectively used for hooking the rear sides of the left and right sides of the upper end of the paper box folded plate (3), the lower end of the conical shifting tooth (172) is used for extending into the middle part of the inner side of the carton folded plate (3).

6. The carton forming and bending machine according to claim 5, wherein the cardboard unfolding bottom closing device (2) comprises a housing (21) and a guide plate (22), a third driving member (23), a sucker assembly (24), a fourth driving member (25) and two folding members (26) which are arranged in the housing (21), the cardboard inlet is arranged at the front side of the housing (21), the guide plate (22) is provided with two, the two guide plates (22) are horizontally arranged in the housing (21) close to the cardboard inlet thereof along the front-back direction and are arranged along the left-right direction in the housing (21), the two guide plates (22) are distributed in a shape like a Chinese character 'ba', the sucker assembly (24) is arranged in the housing (21) through the fourth driving member (25), and suction ports of the sucker assembly (24) are all towards the front, the fourth driving member (25) is used for driving the sucker assembly (24) to move back and forth to pull the carton folded plate (3) at the carton outlet of the carton supplying device (1) into the machine shell (21), and the folding components (26) are used for inwards bending cover edges at four sides of the lower end of the unfolded paper box folded plate (3) to form a paper box, the left side or the right side of the machine shell (21) is provided with the carton outlet, a guide plate (22) far away from the carton outlet is arranged on the machine shell (21) through a third driving piece (23), the third drive (23) is used to drive the corresponding baffle (22) to move adjacent to another baffle (22) to push the carton out through the carton outlet.

7. The carton forming and bending machine according to claim 6, wherein the suction cup assembly (24) comprises a mounting plate (241) and a plurality of suction cups (242), the mounting plate (241) is vertically arranged along the left-right direction, the plurality of suction cups (242) are installed at intervals on the front side of the mounting plate (241) with the suction openings facing forward, and the driving end of the fourth driving member (25) is connected with the rear side of the mounting plate (241).

8. The carton forming and bending machine according to claim 7, wherein the two oppositely folding assemblies (26) are a first oppositely folding assembly and a second oppositely folding assembly, the first oppositely folding assembly comprises two first oppositely folding actuators (261) arranged at intervals in the left-right direction, the first oppositely folding actuators (261) comprise a rotary cylinder (2611) and a swing rod (2612), the rotary cylinder (2611) is horizontally arranged, the driving end of the rotary cylinder (2611) faces forwards or backwards, the swing rod (2612) is vertically arranged, the upper end of the rotary cylinder is fixedly connected with the driving end of the rotary cylinder (2611), the two rotary cylinders (2611) are used for driving the two swing rods (2612) to swing right and left to be close to each other so as to inwards bend the cover edges at the left side and the right side of the lower end of the unfolded carton folded plate (3) to be horizontal or to be far away from each other so as to be reset, and the second oppositely folding assembly is used for inwards bending the cover edges at the front side and the back side of the lower end of the unfolded carton folded plate (3) Bending to be horizontal.

9. The carton forming and bending machine according to claim 8, wherein the second counter-folding assembly comprises a mounting seat (262), two telescopic cylinders (263), two rocker arms (264) and two carrier rollers (265), the mounting seat (262) is mounted at the bottom of the machine shell (21) and is located in the middle between the two rocker arms (2612), one end of each of the two rocker arms (264) is connected with the mounting seat (262) in a front-back swinging manner, the two telescopic cylinders (263) are mounted in the machine shell (21) and correspond to the two rocker arms (264) one by one, the telescopic ends of the two telescopic cylinders (263) are respectively in transmission connection with the middle of the corresponding rocker arms (264) in the length direction, the two carrier rollers (265) are horizontally arranged along the left-right direction and are distributed at intervals along the front-back direction, and the two carrier rollers (265) correspond to the two rocker arms (264) one by one, and the other end of each rocker arm (264) is fixedly connected with the corresponding carrier roller (265), and the two telescopic cylinders (263) are used for driving the two rocker arms (264) to swing until the two carrier rollers (265) move to be close to each other so as to inwards bend the cover edges at the front side and the rear side of the lower end of the unfolded paper box folded plate (3) to be horizontal or be far away from each other so as to reset.

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