CN110983746B

CN110983746B - Clipping device of sail

Info

Publication number: CN110983746B
Application number: CN201911262096.8A
Authority: CN
Inventors: 赖长泉
Original assignee: Yongkang Weiwei Intelligent Technology Co ltd
Current assignee: Yongkang Weiwei Intelligent Technology Co ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-12-01
Anticipated expiration: 2039-12-10
Also published as: CN110983746A

Abstract

A clipping device for a sail; the canvas cutting machine mainly comprises a machine shell, wherein a working cavity and a collecting cavity are arranged in the machine shell, canvas is arranged in the working cavity, a moving cavity and a sliding cavity are arranged in the machine shell, an upper fixing plate is connected in the moving cavity in a sliding mode, a lower fixing plate is connected in the sliding cavity in a sliding mode, the canvas can be fixed by the lower fixing plate and the upper fixing plate, the canvas is prevented from wrinkling during cutting, a cutter handle capable of moving up and down is arranged in the machine shell, a blade capable of cutting the canvas is fixedly connected to the lower end face of the cutter handle, an upper moving fixing block and a lower moving fixing block are arranged in the working cavity, the canvas can be fixed, the canvas can be pulled rightwards to be fed, manual feeding is not needed, the work of workers is reduced, the efficiency is improved, the safety is improved, and meanwhile, the, The springs and the movable plate can drive the blades to horizontally reciprocate when the canvas is cut, so that the cutting quality is better.

Description

Clipping device of sail

Technical Field

The invention relates to the technical field of ships, in particular to a cutting device for a sail.

Background

The sailing boat is driven by taking wind power as a power source in the running process, and the wind power is used in a mode of manufacturing sailcloth into a sail and placing the sail on a mast to receive the wind power, so that the running speed and the running safety of the sailing boat are directly influenced by the quality of the sail;

but the most of tailorring of sail at present is the manual work and tailors the processing, and the sail of tailorring out often is because lack fixed or the fixed unstable that leads to of manual work for the sail of tailorring out corrugates easily, and the manual work is fixed the cutting during cutting simultaneously, leads to the quality of cutting poor, appears quality problems easily, has at present to have the part that often lacks the feeding to the machine of tailorring the canvas, and it is very inconvenient to use, needs the manual work to carry out feeding operation.

Disclosure of Invention

Aiming at the technical defects, the invention provides a clipping device for a sail, which can overcome the defects.

The invention relates to a clipping device for a sail.

Preferably, the mechanical structure drawing of the clipping device for the sails mainly comprises a shell, wherein a working cavity and a collecting cavity are arranged in the shell, the working cavity is internally provided with canvas, a moving cavity and a sliding cavity are arranged in the shell, an upper fixing plate is connected in the moving cavity in a sliding manner, a lifting spring for connecting the upper fixing plate with the moving cavity is arranged in the moving cavity, a lower fixing plate is connected in the sliding cavity in a sliding manner, a pressing spring for connecting the lower fixing plate with the sliding cavity is arranged in the sliding cavity, the canvas can be fixed by pressing the lower fixing plate and the upper fixing plate together, a cutting mechanism is arranged in the shell and comprises a containing cavity positioned in the shell, a handle capable of moving up and down is arranged in the containing cavity, a blade is fixedly connected to the lower end face of the handle, and the canvas can be cut by the blade, be equipped with drive mechanism in the working chamber, drive mechanism includes last removal fixed block and the lower removal fixed block that is equipped with in the working chamber, go up the removal fixed block with the lower removal fixed block can be right the canvas is fixed, can also with the canvas is stimulateeed right and is carried out the feeding, be equipped with the control chamber in the casing right side end wall, be equipped with in the casing and run through the rotation chamber in control chamber, it is connected with the rotation axis that the right-hand member is located the external world to rotate chamber left end wall rotation, rotation axis right-hand member fixedly connected with rotates the handle, control intracavity sliding connection with rotation axis screw-thread fit's barrier plate, rotate the handle through the manual work and can make thereby the barrier plate side to side movement restriction canvas is cut length, be equipped with in the casing and can give lower fixed plate upper fixed plate go up the removal, The driving mechanism is used for driving the lower moving fixing block and the tool shank to move to provide power.

Preferably, cutting mechanism includes hold the lift chamber that is equipped with in the chamber rear end wall, lift chamber left end be equipped with the reciprocating mechanism that the handle of a knife is connected, reciprocating mechanism rear end face fixedly connected with lifter plate, be equipped with the lifter plate chamber in the lifter plate, lift chamber rear end wall rotates and is connected with the driven shaft, driven shaft front end fixedly connected with rotates the disc, the terminal surface rotates before the rotation disc and is connected with and is located the rotating pin of lifter plate intracavity, driven shaft rear end fixedly connected with driven bevel gear.

Preferably, reciprocating mechanism include fixed connection in the fixed block of lift chamber front end wall, be equipped with the fixed block chamber in the fixed block, end wall fixedly connected with driving motor under the fixed block chamber, driving motor power is connected with the transmission shaft, transmission shaft upper end fixedly connected with cam, fixed block intracavity sliding connection has and is located the movable plate of cam front end, terminal surface fixedly connected with rear end is located before the movable plate the fixed block intracavity the handle of a knife, be equipped with the connection in the fixed block chamber terminal surface before the movable plate with two reset spring of fixed block chamber front end wall, the fixed block rear end surface with terminal surface fixed connection before the lifter plate.

Preferably, drive mechanism includes the translation chamber that is equipped with in the working chamber rear end wall, translation chamber sliding connection has the translation piece, be equipped with the connection in the translation chamber translation piece left end face with the horizontal spring of translation chamber left end wall, be equipped with the translation piece chamber in the translation piece, translation piece intracavity sliding connection has first electro-magnet, be equipped with the connection in the translation piece chamber first electro-magnet up end with the first fastening spring of translation piece chamber upper end wall, translation piece intracavity sliding connection has and is located the second electro-magnet of first electro-magnet downside, translation piece intracavity is equipped with the connection under the second electro-magnet terminal surface with the second fastening spring of translation piece chamber lower end wall, another terminal surface of terminal surface fixedly connected with before the first electro-magnet with go up the last intermediate lever that moves fixed block fixed connection, another terminal surface fixedly connected with another terminal surface before the second electro-magnet with move fixed block fixed connection's lower intermediate lever down .

Preferably, the driving mechanism comprises a driving cavity arranged in the casing, the upper end wall of the driving cavity is fixedly connected with a driving motor, the driving motor is in power connection with a driving shaft, the upper end of the driving shaft is fixedly connected with a driving friction wheel, three driving shafts rotatably connected to the upper end wall of the driving cavity are arranged on the left side, the right side and the rear side of the driving motor, the upper end of the driving shaft is fixedly connected with a driving friction wheel meshed with the driving friction wheel, the lower end of the right driving shaft is fixedly connected with a second incomplete gear, the right side of the right driving shaft is provided with a convolution shaft rotatably connected to the upper end wall of the driving cavity, the lower end of the convolution shaft is fixedly connected with a rotating shaft meshed with the second incomplete gear, the upper end of the convolution shaft is fixedly connected with a traction rope fixedly connected with the other end of the convolution shaft and the, the left side of the left side driving shaft is provided with a winding shaft which is rotatably connected to the upper end wall of the driving cavity, the lower end of the winding shaft is fixedly connected with a driven wheel which is meshed with the first incomplete gear, the upper end of the winding shaft is fixedly connected with a fixing rope of which the other end is fixedly connected with the upper end face of the upper fixing plate and a connecting rope of which the other end is fixedly connected with the lower end face of the lower fixing plate, the lower end of the rear side driving shaft is fixedly connected with a third incomplete gear, the rear side of the rear side driving shaft is provided with a rotating shaft which is rotatably connected to the upper end wall of the driving cavity and the lower end of the rear side driving shaft is located in the lifting cavity, the lower end of the rotating shaft is fixedly connected with a rotating gear which is meshed with the third incomplete gear, and.

Preferably, the first incomplete gear is a quarter toothed gear, the second incomplete gear is a three-quarter toothed gear, the third incomplete gear is a half toothed gear, and the driving bevel gear rotates for half a turn to drive the driven bevel gear to rotate for one turn.

In conclusion, the canvas cutting machine can fix canvas during cutting through the two fixing blocks and the two movable fixing blocks, so that wrinkling of the canvas during cutting is prevented, meanwhile, the blade can be driven to horizontally reciprocate during cutting of the canvas through the cam, the spring and the moving plate in the horizontal reciprocating mechanism, and the cutting quality is better;

the two movable fixing blocks are arranged, so that automatic feeding can be realized after the canvas is cut, manual feeding is not needed, the work of workers is reduced, the efficiency is improved, and meanwhile, the safety is improved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic view of a sail trimming apparatus according to the present invention;

FIG. 2 is an enlarged view of the structure A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure B-B in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure C-C in FIG. 1 according to an embodiment of the present invention;

FIG. 5 is an enlarged view of the D-D structure shown in FIG. 4 according to an embodiment of the present invention.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The invention will now be described in detail with reference to fig. 1-5, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

As shown in fig. 1-5, a mechanical structure of a clipping device for a sail of the present invention mainly includes a housing 10, a working chamber 11 and a collecting chamber 79 are disposed in the housing 10, a sail cloth 12 is disposed in the working chamber 11, a moving chamber 15 and a sliding chamber 42 are disposed in the housing 10, an upper fixing plate 14 is slidably connected to the moving chamber 15, a lifting spring 16 is disposed in the moving chamber 15 and connects the upper fixing plate 14 and the moving chamber 15, a lower fixing plate 13 is slidably connected to the sliding chamber 42, a pressing spring 43 is disposed in the sliding chamber 42 and connects the lower fixing plate 13 and the sliding chamber 42, the lower fixing plate 13 and the upper fixing plate 14 are pressed together to fix the sail cloth 12, a cutting mechanism 76 is disposed in the housing 10, the cutting mechanism 76 includes an accommodating chamber 37 disposed in the housing 10, the containing cavity 37 is internally provided with a handle 38 capable of moving up and down, the lower end face of the handle 38 is fixedly connected with a blade 39, the blade 39 can cut canvas, the working cavity 11 is internally provided with a traction mechanism 77, the traction mechanism 77 comprises an upper movable fixed block 40 and a lower movable fixed block 41 which are arranged in the working cavity 11, the upper movable fixed block 40 and the lower movable fixed block 41 can fix the canvas 12 and can pull the canvas 12 to the right for feeding, the right end wall of the casing 10 is internally provided with a control cavity 35, the casing 10 is internally provided with a rotating cavity 34 which runs through the control cavity 35, the left end wall of the rotating cavity 34 is rotatably connected with a rotating shaft 33 with the right end positioned outside, the right end of the rotating shaft 33 is fixedly connected with a rotating handle 32, and the control cavity 35 is internally slidably connected with a blocking plate 36 which is in threaded fit with the, the stop plate 36 can be moved left and right by manually rotating the rotating handle 32 to limit the length of the canvas to be cut, and a driving mechanism 75 which can provide power for the lower fixing plate 13, the upper fixing plate 14, the upper moving fixing block 40, the lower moving fixing block 41 and the knife handle 38 to move is arranged in the housing 10.

Beneficially, cutting mechanism 76 includes hold lift chamber 55 that is equipped with in the chamber 37 rear end wall, lift chamber 55 left end be equipped with reciprocating mechanism 78 that handle of a knife 38 is connected, reciprocating mechanism 78 rear end face fixedly connected with lifter plate 53, be equipped with lifter plate chamber 60 in the lifter plate 53, lift chamber 55 rear end wall rotates and is connected with driven shaft 59, driven shaft 59 front end fixedly connected with rotates disc 56, the terminal surface rotates and is connected with the rotating pin 54 that is located in lifter plate chamber 60 before rotating disc 56, driven shaft 59 rear end fixedly connected with driven bevel gear 58.

Beneficially, the reciprocating mechanism 78 includes a fixed block 49 fixedly connected to the front end wall of the lifting cavity 55, a fixed block cavity 52 is arranged in the fixed block 49, a driving motor 74 is fixedly connected to the lower end wall of the fixed block cavity 52, a driving shaft 62 is in power connection with the driving motor 74, a cam 61 is fixedly connected to the upper end of the driving shaft 62, a moving plate 51 located at the front end of the cam 61 is slidably connected in the fixed block cavity 52, the front end face of the moving plate 51 is fixedly connected with a rear end located in the knife handle 38 in the fixed block cavity 52, two return springs 50 connected to the front end face of the moving plate 51 and the front end wall of the fixed block cavity 52 are arranged in the fixed block cavity 52, and the rear end face of the fixed block 49 is fixedly.

Beneficially, the traction mechanism 77 includes a translation cavity 64 provided in a rear end wall of the working cavity 11, the translation cavity 64 is slidably connected with a translation block 65, a horizontal spring 72 connected between a left end surface of the translation block 65 and a left end wall of the translation cavity 64 is provided in the translation cavity 64, a translation block cavity 70 is provided in the translation block 65, a first electromagnet 67 is slidably connected in the translation block cavity 70, a first fastening spring 66 connected between an upper end surface of the first electromagnet 67 and an upper end wall of the translation block cavity 70 is provided in the translation block cavity 70, a second electromagnet 68 located on a lower side of the first electromagnet 67 is slidably connected in the translation block cavity 70, a second fastening spring 69 connected between a lower end surface of the second electromagnet 68 and a lower end wall of the translation block cavity 70 is provided in the translation block cavity 70, the front end surface of the first electromagnet 67 is fixedly connected with an upper intermediate rod 63 fixedly connected with the other end surface and the upper fixed block 40, the front end face of the second electromagnet 68 is fixedly connected with a lower intermediate rod 71, and the other end face of the lower intermediate rod is fixedly connected with the lower movable fixed block 41.

Advantageously, the driving mechanism 75 includes a driving cavity 17 provided in the casing 10, a driving motor 25 is fixedly connected to an upper end wall of the driving cavity 17, the driving motor 25 is power-connected to a driving shaft 26, a driving friction wheel 24 is fixedly connected to an upper end of the driving shaft 26, three driving shafts 27 rotatably connected to an upper end wall of the driving cavity 17 are provided on left, right and rear sides of the driving motor 25, a driving friction wheel 28 engaged with the driving friction wheel 24 is fixedly connected to an upper end of the driving shaft 27, a second incomplete gear 30 is fixedly connected to a lower end of the right driving shaft 27, a convolution shaft 29 rotatably connected to an upper end wall of the driving cavity 17 is provided on a right side of the right driving shaft 27, a rotating shaft 31 engaged with the second incomplete gear 30 is fixedly connected to a lower end of the convolution shaft 29, a traction rope 73 fixedly connected to a right end face of the translation block 65 is fixedly connected to an upper end, the lower end of the left driving shaft 27 is fixedly connected with a first incomplete gear 22, the left side of the left driving shaft 27 is provided with a winding shaft 19 rotatably connected to the upper end wall of the driving cavity 17, the lower end of the winding shaft 19 is fixedly connected with a driven wheel 18 engaged with the first incomplete gear 22, the upper end of the winding shaft 19 is fixedly connected with a fixing rope 20 of which the other end is fixedly connected with the upper end surface of the upper fixing plate 14 and a connecting rope 21 of which the other end is fixedly connected with the lower end surface of the lower fixing plate 13, the lower end of the rear driving shaft 27 is fixedly connected with a third incomplete gear 48, the rear side of the rear driving shaft 27 is provided with a winding shaft 45 rotatably connected to the upper end wall of the driving cavity 17 and the lower end of which is positioned in the lifting cavity 55, the lower end of the winding shaft 45 is fixedly connected with a rotating gear 44 engaged with the third incomplete gear 48, and a main bevel gear fixedly connected to the lower end A moving bevel gear 57.

Advantageously, the first incomplete gear 22 is a quarter toothed gear, the second incomplete gear 30 is a three-quarter toothed gear, the third incomplete gear 48 is a half toothed gear, and the driving bevel gear 57 makes a half turn to make the driven bevel gear 58 make a turn.

The applicant will now specifically describe a sail trimming device according to the present application with reference to the accompanying figures 1 to 5 and the description above:

in an initial state, the lifting spring 16 and the abutting spring 43 are in a compressed state, the return spring 50 is in a relaxed state, the first fastening spring 66 and the second fastening spring 69 are in a relaxed state, the canvas 12 is manually placed between the lower fixing plate 13 and the upper fixing plate 14 and between the upper moving fixing block 40 and the lower moving fixing block 41, the first incomplete gear 22 is just meshed with the driven wheel 18, the second incomplete gear 30 is just meshed with the rotating shaft 31, the third incomplete gear 48 is meshed with the rotating gear 44 after a quarter of a circle, the knife handle 38 is initially located at the highest position of self movement, the upper moving fixing block 40 and the lower moving fixing block 41 are located at the leftmost position of self movement, and the first electromagnet 67 and the second electromagnet 68 start to mutually attract and drive the upper moving fixing block 40 and the lower moving fixing block 41 to abut against to fix the canvas 12;

when the operation is started, the driving motor 25 is started to drive the driving shaft 26 to rotate for a quarter turn, so as to drive the driving friction wheel 24 to rotate, so as to drive the left driving friction wheel 28 to rotate, so as to drive the left driving shaft 27 to rotate, so as to drive the first incomplete gear 22 to rotate, so as to drive the driven wheel 18 to rotate as the first incomplete gear 22 is just meshed with the driven wheel 18, so as to drive the winding shaft 19 to rotate, so as to wind the fixing rope 20 and the connecting rope 21 on the winding shaft 19, the fixing rope 20 is wound to pull the upper fixing plate 14 to move upwards and compress the lifting spring 16, the connecting rope 21 is wound to pull the lower fixing plate 13 to move downwards and compress the pressing spring 43, so as to loosen the canvas 12, and simultaneously the driving friction wheel 24 is rotated to drive the right driving friction wheel 28 to rotate, so as to drive the right driving shaft 27 to, since the second incomplete gear 30 is just meshed with the rotating shaft 31, the rotating shaft 31 is driven to rotate, the convolution shaft 29 is driven to rotate to wind the traction rope 73, the traction rope 73 is wound to pull the translation block 65 to move rightwards and stretch the horizontal spring 72, the translation block 65 moves rightwards to drive the first electromagnet 67 and the second electromagnet 68 to move rightwards, the upper moving fixing block 40 and the lower moving fixing block 41 are driven to move rightwards to be blocked by the blocking plate 36 through the upper middle rod 63 and the lower middle rod 71, when the canvas cutting length needs to be adjusted, the rotating handle 32 is manually rotated, the rotating shaft 33 is driven to rotate, the blocking plate 36 is horizontally moved, the driving friction wheel 24 does not drive the right driving friction wheel 28 to rotate, and the upper moving fixing block 40 and the lower moving fixing block 41 are kept at the left end of the blocking plate 36;

the driving shaft 26 rotates for a half turn, at this time, the first incomplete gear 22 is disengaged from the driven wheel 18, the first incomplete gear 22 does not rotate to drive the driven wheel 18, the upper fixing plate 14 moves downwards to return to the initial position under the elastic force of the lifting spring 16, the lower fixing plate 13 moves upwards to return to the initial position under the elastic force of the pressing spring 43, the upper fixing plate 14 abuts against the lower fixing plate 13 to fix the canvas 12, the second incomplete gear 30 continues to be engaged with the rotating shaft 31, the upper moving fixing block 40 and the lower moving fixing block 41 do not move, simultaneously, the driving shaft 26 rotates to drive the driving friction wheel 24 to rotate, thereby driving the rear driving friction wheel 28 to rotate, thereby driving the rear driving shaft 27 to rotate, thereby driving the third incomplete gear 48 to rotate, at this time, the third incomplete gear 48 is engaged with the rotating gear 44, thereby driving the rotating gear 44 to rotate, thereby driving the rotating shaft 45 to rotate, driving the driving bevel gear 57 to rotate, driving the driven bevel gear 58 to rotate, driving the driven shaft 59 to rotate, driving the rotating disc 56 to rotate, driving the rotating pin 54 to rotate, driving the lifting plate 53 to move up and down once, driving the fixing block 49 to move up and down once, driving the knife handle 38 to move up and down once, driving the knife blade 39 to move up and down once, cutting the canvas with two fixed ends, simultaneously, the driving motor 74 starts to drive the transmission shaft 62 to rotate, driving the cam 61 to rotate, thereby pushing the moving plate 51 to move, under the cooperation of the return spring 50, the moving plate 51 reciprocates, driving the knife handle 38 and the knife blade 39 to reciprocate, so that the canvas is more easily difficult to wrinkle when the knife blade 39 cuts the canvas;

the driving shaft 26 rotates for the last quarter of a turn, the first incomplete gear 22 is not meshed with the driven wheel 18, the upper fixing plate 14 and the lower fixing plate 13 continue to fix the canvas 12, the third incomplete gear 48 is disengaged from the rotating gear 44, the accommodating cavity 37 and the tool holder 38 return to the initial position, the driving motor 74 is turned off, the cam 61 does not rotate any more, the first electromagnet 67 and the second electromagnet 68 are turned off at the same time, the first electromagnet 67 and the second electromagnet 68 are separated under the elastic force of the first fastening spring 66 and the second fastening spring 69, the upper movable fixing block 40 and the lower movable fixing block 41 are driven by the upper intermediate rod 63 and the lower intermediate rod 71 to be separated, the cut canvas falls into the collecting cavity 79 to be collected, the second incomplete gear 30 is disengaged from the rotating shaft 31, and the first electromagnet 67 and the second electromagnet 68 are driven by the leftward movement of the translation block 65 under the elastic force of the horizontal spring 72, the upper movable fixing block 40 and the lower movable fixing block 41 are driven by the upper middle rod 63 and the lower middle rod 71 to move leftwards to return to the initial positions to abut against the right end faces of the lower fixing plate 13 and the upper fixing plate 14, then the first electromagnet 67 and the second electromagnet 68 are started, the first electromagnet 67 and the second electromagnet 68 attract each other to move oppositely and stretch the first fastening spring 66 and the second fastening spring 69, the first electromagnet 67 and the second electromagnet 68 move oppositely and drive the upper movable fixing block 40 and the lower movable fixing block 41 to move oppositely through the upper middle rod 63 and the lower middle rod 71, so that the upper movable fixing block 40 and the lower movable fixing block 41 abut against each other to fix the canvas 12 left after the cutting of the right ends of the lower fixing plate 13 and the upper fixing plate 14 between the upper movable fixing block 40 and the lower movable fixing block 41, and the feeding reset after one-time canvas cutting is completed.

The above description is only an embodiment of the invention, but the scope of the invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Claims

1. A clipping device of sail, includes the casing, its characterized in that: the canvas cutting machine is characterized in that a working cavity and a collecting cavity are arranged in the machine shell, canvas is arranged in the working cavity, a moving cavity and a sliding cavity are arranged in the machine shell, an upper fixing plate is connected in the moving cavity in a sliding mode, a lifting spring is arranged in the moving cavity and used for connecting the upper fixing plate with the moving cavity, a lower fixing plate is connected in the sliding cavity in a sliding mode, a pressing spring is arranged in the sliding cavity and used for connecting the lower fixing plate with the sliding cavity, the canvas can be fixed by the fact that the lower fixing plate and the upper fixing plate are pressed together, a cutting mechanism is arranged in the machine shell and comprises a containing cavity located in the machine shell, a cutter handle capable of moving up and down is arranged in the containing cavity, a blade is fixedly connected to the lower end face of the cutter handle, the canvas can be cut by the blade, a traction mechanism is arranged in the working cavity and, the upper moving fixed block and the lower moving fixed block can fix the canvas, the canvas can be pulled rightwards to be fed, a control cavity is arranged in the end wall of the right side of the casing, a rotating cavity penetrating through the control cavity is arranged in the casing, the left end wall of the rotating cavity is rotatably connected with a rotating shaft with the right end positioned outside, the right end of the rotating shaft is fixedly connected with a rotating handle, a blocking plate in threaded fit with the rotating shaft is connected in the control cavity in a sliding manner, the blocking plate can move leftwards and rightwards by manually rotating the rotating handle so as to limit the length of the canvas to be cut, and a driving mechanism which can provide power for the lower fixed plate, the upper moving fixed block, the lower moving fixed block and the knife handle is arranged in the casing;

the cutting mechanism comprises a lifting cavity arranged in the rear end wall of the accommodating cavity, a reciprocating mechanism connected with the cutter handle is arranged at the left end of the lifting cavity, a lifting plate is fixedly connected to the rear end face of the reciprocating mechanism, a lifting plate cavity is arranged in the lifting plate, the rear end wall of the lifting cavity is rotatably connected with a driven shaft, the front end of the driven shaft is fixedly connected with a rotating disc, the front end face of the rotating disc is rotatably connected with a rotating pin positioned in the lifting plate cavity, and the rear end of the driven shaft is fixedly connected with a driven bevel gear;

the reciprocating mechanism comprises a fixed block fixedly connected to the front end wall of the lifting cavity, a fixed block cavity is arranged in the fixed block, the lower end wall of the fixed block cavity is fixedly connected with an active motor, the active motor is in power connection with a transmission shaft, the upper end of the transmission shaft is fixedly connected with a cam, a moving plate located at the front end of the cam is connected in the fixed block cavity in a sliding manner, the front end face of the moving plate is fixedly connected with the knife handle, the rear end of the knife handle is located in the fixed block cavity, two reset springs for connecting the front end face of the moving plate and the front end wall of the fixed block cavity are arranged in the fixed block cavity;

the traction mechanism comprises a translation cavity arranged in the rear end wall of the working cavity, the translation cavity is connected with a translation block in a sliding way, a horizontal spring which is connected with the left end surface of the translation block and the left end wall of the translation cavity is arranged in the translation cavity, a translation block cavity is arranged in the translation block, a first electromagnet is connected in the translation block cavity in a sliding way, a first fastening spring which is connected with the upper end surface of the first electromagnet and the upper end wall of the translation block cavity is arranged in the translation block cavity, a second electromagnet positioned on the lower side of the first electromagnet is connected in the translation block cavity in a sliding manner, a second fastening spring for connecting the lower end surface of the second electromagnet and the lower end wall of the translation block cavity is arranged in the translation block cavity, the front end surface of the first electromagnet is fixedly connected with an upper intermediate rod of which the other end surface is fixedly connected with the upper movable fixed block, the front end surface of the second electromagnet is fixedly connected with a lower middle rod, and the other end surface of the lower middle rod is fixedly connected with the lower movable fixing block;

the driving mechanism comprises a driving cavity arranged in the casing, the upper end wall of the driving cavity is fixedly connected with a driving motor, the driving motor is in power connection with a driving shaft, the upper end of the driving shaft is fixedly connected with a driving friction wheel, the left side, the right side and the rear side of the driving motor are provided with three driving shafts rotatably connected to the upper end wall of the driving cavity, the upper end of the driving shaft is fixedly connected with a driving friction wheel meshed with the driving friction wheel, the lower end of the driving shaft on the right side of the driving motor is fixedly connected with a second incomplete gear, the right side of the driving shaft on the right side of the driving motor is provided with a convolution shaft rotatably connected to the upper end wall of the driving cavity, the lower end of the convolution shaft is fixedly connected with a rotating shaft meshed with the second incomplete gear, the upper end of, the lower end of a driving shaft on the left side of the driving motor is fixedly connected with a first incomplete gear, a winding shaft which is rotatably connected to the upper end wall of the driving cavity is arranged on the left side of the driving shaft on the left side of the driving motor, the lower end of the winding shaft is fixedly connected with a driven wheel which is meshed with the first incomplete gear, a fixed rope of which the other end is fixedly connected with the upper end face of the upper fixed plate and a connecting rope of which the other end is fixedly connected with the lower end face of the lower fixed plate are fixedly connected to the upper end face of the upper fixed plate, a third incomplete gear is fixedly connected to the lower end of the driving shaft on the rear side of the driving motor, a winding shaft which is rotatably connected to the upper end wall of the driving cavity and of which the lower end is located in the lifting cavity is arranged on the rear side of the driving shaft on the rear side of the driving motor, a rotating gear which is meshed;

the first incomplete gear is a one-fourth toothed gear, the second incomplete gear is a three-fourth toothed gear, the third incomplete gear is a one-half toothed gear, and the driving bevel gear rotates for half a circle to drive the driven bevel gear to rotate for a circle.