CN115805619A

CN115805619A - Cutting machine for rebound protection of sheet film

Info

Publication number: CN115805619A
Application number: CN202211561315.4A
Authority: CN
Inventors: 何海潮; 刘春华; 王爱亭
Original assignee: Chuzhou Jinwei Plate Film Intelligent Equipment Co ltd
Current assignee: Chuzhou Jinwei Plate Film Intelligent Equipment Co ltd
Priority date: 2022-12-06
Filing date: 2022-12-06
Publication date: 2023-03-17

Abstract

The invention discloses a cutting machine for protecting rebound of a sheet film, which comprises a table board, wherein stand columns are fixedly arranged on the outer walls of two sides of the top of the table board, a through chute is formed in the outer wall of one side of each stand column, a cross beam is inserted in the chute in a sliding manner, a slitting knife is fixedly arranged on the outer wall of the bottom of the cross beam, sheet pressing assemblies are fixedly arranged on the outer walls of two sides of the cross beam, a transmission mechanism connected with the cross beam is arranged below one side of the table board, sliding holes are formed in two sides of each stand column, and a cantilever is arranged in each sliding hole through a moving block. The film cutting machine can drive the cross beam and the slitting knife to move up and down in a reciprocating mode through the arranged transmission mechanism, so that the slitting knife is driven to cut a film, and meanwhile, when the cross beam and the slitting knife descend, the pressing sheet assemblies arranged on the cross beam can be linked synchronously, so that pre-pressed film fixing of the film is realized, and then the film is cut, the film cutting precision is improved, and the waste of the film material in use is reduced.

Description

Cutting machine for rebound protection of sheet film

Technical Field

The invention relates to the technical field of film processing, in particular to a cutting machine for rebound protection of a sheet film.

Background

Polyethylene terephthalate (PET) is a thermoplastic plastic with good properties, has a high melting temperature and glass transition temperature, has good heat resistance, fatigue resistance, friction and wear resistance, creep resistance, electrical insulation and chemical resistance, is less expensive than other engineering plastics, and is widely used in the fields of synthetic fibers, films (sheet-shaped films), engineering plastics, medicines and daily necessities. The PET stretching film is widely applied to protective films of various industrial, liquid crystal display and plasma display devices, the consumption of the PET thick film is quite large, solar films and explosion-proof films are increasingly widely applied to automobiles and buildings, and the market is extremely wide.

When the coiled sheet-plate film is used, the fixed-length cutting needs to be carried out on the coiled sheet-plate film, so that the size of how much cut sheet-plate film is used for people, some existing cutting devices are manually cut by utilizing a manual mode, and other existing cutting devices are used for realizing semi-automatic cutting processing by adopting mechanical devices.

However, the existing splitting machine lacks the steps and structure for pressing the film on the plate film, so that the precision of the film splitting is not high, the film needs to be trimmed when in use, and the use of film resources is wasted. Therefore, there is a need to design a blade film rebound protection slitting machine to solve the above problems.

Disclosure of Invention

The invention aims to provide a cutting machine for protecting rebound of a sheet film, which aims to overcome the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides a protection cutting machine is kick-backed to slabstone membrane, includes the mesa, equal fixed mounting has the stand on the outer wall of mesa top both sides, and opens on one side outer wall of stand and have the spout that runs through, the inside slip of spout is pegged graft there is the crossbeam, and fixed mounting has branch cutter on the bottom outer wall of crossbeam, equal fixed mounting has the preforming subassembly on the both sides outer wall of crossbeam, the below of mesa one side is provided with the drive mechanism who is connected with the crossbeam, the both sides of stand all are provided with the slide opening, and the inside of slide opening is provided with the cantilever through the movable block, the end fixed mounting of cantilever has rolling mechanism, the fixed climbing mechanism of installing on the mesa that is provided with in below of cantilever.

Furthermore, a plurality of supporting legs are fixedly mounted at the bottom of the table board, and transverse connecting rods are fixedly arranged between the supporting legs.

Further, the preforming subassembly includes the fixed plate of fixed mounting on the crossbeam outer wall, and fixed cover one of fixed mounting on the outer wall of fixed plate bottom, the inside of fixed cover one bottom is pegged graft and is had the telescopic link, and the fixed cover two has been cup jointed to the outside of telescopic link bottom.

Furthermore, pressure springs are arranged in the space between the first fixing sleeve and the telescopic rod, the space between the second fixing sleeve and the telescopic rod, and end covers are arranged at the top of the first fixing sleeve and the bottom of the second fixing sleeve.

Furthermore, a horizontally arranged pressing plate is fixedly installed at the bottom of the pressing plate assembly, and an anti-slip pad is arranged on the outer wall of the bottom of the pressing plate.

Further, drive mechanism is including fixing the positive and negative motor one that rotates in mesa one side, and fixed mounting has the swinging arms on the output shaft of positive and negative motor one, the swinging arms is scalable pole, and the top of swinging arms is connected with the transfer line through the hinge transmission, the inside slip joint of spout has the slider, and fixed mounting has the round pin axle on the outer wall of one side of slider, the axle sleeve is passed through to the one end of transfer line and the round pin hub fixation is on the slider, the inside of spout is provided with the spring that top and slider contacted, fixed mounting has the guide bar that runs through to the stand outside on the top outer wall of slider.

Further, equal fixed mounting has a fixing base, two on the outer wall of mesa top both sides install between the fixing base and carry the thing axle, and all open on one side outer wall of fixing base and be used for the joint to carry the draw-in groove of thing axle.

Further, the rolling mechanism includes the framed bent of fixed mounting on the cantilever, and is provided with a plurality of rubber roll between the framed bent, the one end of rubber roll has the linkage wheel through the hub connection, and is provided with synchronous transmission's belt one between a plurality of linkage wheel, fixed mounting has driving motor on the outer wall at cantilever top, and fixed mounting has the action wheel on driving motor's the output shaft, the transmission is connected with belt two on the outer wall of action wheel, and belt two keep away from the one end of action wheel and be provided with from the driving wheel, fix on the coaxial of one of them linkage wheel from the driving wheel.

Further, climbing mechanism is including fixing the cushion collar on mesa top outer wall, and the inside fixed mounting of cushion collar has buffer spring, the inside grafting of cushion collar has the pull rod that runs through to the mesa below, fixed mounting has the fixed disk on the bottom outer wall of pull rod, the below fixed mounting of mesa has positive reverse motor two, and fixed mounting has the cam on the output shaft of positive reverse motor two, the cam is located the fixed disk top and contacts all the time.

Furthermore, the outer wall of the top of the table top is provided with a through groove, and the specification of the through groove is matched with the specification of the cutting knife.

In the technical scheme, the cutting machine for protecting rebound of the sheet film, provided by the invention, can drive the cross beam and the slitting knife to move up and down in a reciprocating manner through the arranged transmission mechanism, so that the slitting knife is driven to cut the film, and meanwhile, when the cross beam and the slitting knife descend, the sheet pressing assemblies arranged on the cross beam can be synchronously linked to realize the fixation of a pre-pressed film on the film and the slitting of the film, so that the precision of the film slitting is improved, and the waste of the film material during use is reduced. The climbing mechanism of installation on the cantilever of adoption can drive the cantilever and rise and descend, drives rolling mechanism simultaneously and presses on the membrane, and the rotation through rolling mechanism simultaneously can drive the membrane of lapping and carry out the blowing and to the transmission of the membrane after cutting, has saved the time that people cut the membrane of lapping, has improved the efficiency of cutting the membrane.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

Fig. 1 is a schematic structural diagram provided by an embodiment of a cutting machine for protecting rebound of a sheet film according to the present invention.

Fig. 2 is a schematic structural diagram of a transmission mechanism provided in an embodiment of the cutting machine for protecting rebound of a blade film.

Fig. 3 is a schematic structural diagram of a tabletting assembly provided by an embodiment of the cutting machine for protecting rebound of a tabletting film of the present invention.

Fig. 4 is a schematic view of a partially enlarged structure of a cutting machine according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a jacking mechanism provided in an embodiment of the cutting machine for protecting rebound of a sheet film.

Description of reference numerals:

1 table top, 2 supporting legs, 3 upright columns, 4 sliding grooves, 5 cross beams, 6 slitting knives, 7 fixing plates, 8 tabletting components, 9 pressing plates, 10 transmission mechanisms, 11 guide rods, 12 sliding blocks, 13 pin shafts, 14 springs, 15 transmission rods, 16 hinge shafts, 17 swinging rods, 18 forward and reverse rotating motors I, 19 fixing seats, 20 clamping grooves, 21 carrying shafts, 22 fixing sleeves I, 23 fixing sleeves II, 24 telescopic rods, 25 compression springs, 26 end covers, 27 sliding holes, 28 cantilever arms, 29 bent frames, 30 rubber rollers, 31 linkage wheels, 32 belts I, 33 driven wheels, 34 belts II, 35 driving wheels, 36 driving motors, 37 jacking mechanisms, 38 buffer sleeves, 39 buffer springs, 40 pull rods, 41 fixing disks, 42 cams and 43 forward and reverse rotating motors II.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings.

As shown in fig. 1-5, the cutting machine for protecting rebound of a sheet film provided by the embodiment of the present invention comprises a table top 1, wherein the outer walls of two sides of the top of the table top 1 are both fixedly installed with an upright post 3, the outer wall of one side of the upright post 3 is opened with a through chute 4, the inside of the chute 4 is slidably inserted with a cross beam 5, the outer wall of the bottom of the cross beam 5 is fixedly installed with a slitting knife 6, the outer walls of two sides of the cross beam 5 are both fixedly installed with a sheet pressing assembly 8, the lower part of one side of the table top 1 is provided with a transmission mechanism 10 connected with the cross beam 5, two sides of the upright post 3 are both provided with a slide hole 27, the inside of the slide hole 27 is provided with a cantilever 28 through a moving block, the end part of the cantilever 28 is fixedly installed with a rolling mechanism, and the lower part of the cantilever 28 is fixedly provided with a jacking mechanism 37 installed on the table top 1.

Specifically, in this embodiment, including mesa 1, mesa 1 can adopt the aluminium alloy material preparation, guarantee its support strength and the smoothness of top surface, avoid causing the damage when cutting the membrane, equal fixed mounting has stand 3 on the outer wall of mesa 1 top both sides, and it has spout 4 that runs through to open on one side outer wall of stand 3, spout 4 is left right direction through structure, spout 4's inside slip is pegged graft there is crossbeam 5, crossbeam 5 can be along two stand 3 oscilaltions, and fixed mounting has branch cutter 6 on the bottom outer wall of crossbeam 5, drive branch cutter 6 synchronous motion by the oscilaltion of crossbeam 5, it has logical groove to open on the outer wall of mesa 1 top, and the specification of logical groove and the specification looks adaptation of branch cutter 6, equal fixed mounting has preforming subassembly 8 on the both sides outer wall of crossbeam 5, realize the swager operation to the membrane on mesa 1 through preforming subassembly 8, play fixed effect to the membrane before cutting the membrane, the precision of cutting has improved the cutting, the below of mesa 1 one side is provided with drive mechanism 10 that is connected with crossbeam 5, as power unit, can drive 5 and the material pressing operation of stand 6, the equal mounting of crossbeam and the pole of the cantilever 27, the cantilever is provided with the fixed mounting of cantilever that the cantilever roll down end of cantilever 27, the cantilever portion of cantilever is provided with cantilever 27, the fixed mounting of cantilever that the cantilever is provided with the cantilever slide hole 28.

According to the cutting machine for protecting the rebound of the sheet film, which is provided by the invention, the cross beam 5 and the slitting knife 6 can be driven to reciprocate through the arranged transmission mechanism 10, so that the slitting knife 6 is driven to cut the film, and meanwhile, when the cross beam 5 and the slitting knife 6 descend, the pressing sheet assemblies 8 arranged on the cross beam 5 can be synchronously linked, so that the fixation of the film in advance by pressing the film is realized, the cutting of the film is realized, the precision of the cutting of the film is improved, and the waste of the film material during the use is reduced.

Climbing mechanism 37 of installation on the cantilever 28 of adoption can drive cantilever 28 and rise and descend, drives rolling mechanism simultaneously and presses on the membrane, and through rolling mechanism's rotation, can drive the membrane of lapping and carry out the blowing and the transmission to the membrane after cutting simultaneously, has saved the time that people cut the membrane of lapping, has improved the efficiency of cutting the membrane.

In one embodiment provided by the invention, the bottom of the table board 1 is fixedly provided with the supporting legs 2, the transverse connecting rods are fixedly arranged between the supporting legs 2 and used as supporting parts for the table board 1, so that the table board 1 is lifted by a certain height, the operation of a splitting machine is facilitated for people, and meanwhile, a supporting structure formed by the transverse connecting rods and the supporting legs 2 has the characteristics of high stability and reliable support, and the splitting machine is prevented from shaking during working.

In another embodiment provided by the present invention, as shown in fig. 3, the pressing plate assembly 8 includes a fixing plate 7 fixedly mounted on the outer wall of the cross beam 5, and a fixing sleeve one 22 is fixedly mounted on the outer wall of the bottom of the fixing plate 7, an expansion link 24 is inserted into the inside of the bottom end of the fixing sleeve one 22, and a fixing sleeve two 23 is sleeved on the outside of the bottom end of the expansion link 24; pressure springs 25 are arranged in the spaces between the first fixing sleeve 22, the second fixing sleeve 23 and the telescopic rod 24, and end covers 26 are arranged at the top of the first fixing sleeve 22 and the bottom of the second fixing sleeve 22; the bottom of the pressing component 8 is fixedly provided with a pressing plate 9 which is horizontally arranged, and the outer wall of the bottom of the pressing plate 9 is provided with an anti-slip pad.

The cross beam is driven to move through the transmission mechanism 10, when the cross beam 5 descends, the pressing plate 9 firstly contacts the upper side of the film, the cross beam 5 continuously descends, the telescopic rod 24 can be contracted in the first fixing sleeve 22 and the second fixing sleeve 23, meanwhile, the pressure spring 25 is compressed, and the slitting knife 6 is in contact with the film and finishes slitting operation after the telescopic rod 24 is accommodated in the first fixing sleeve 22 and the second fixing sleeve 23; after accomplishing cutting the membrane, crossbeam 5 lifting, divide cutter 6 and membrane separation back this moment, pressure spring 25 resumes former shape, and clamp plate 9 this moment still receives external force and presses on the membrane after cutting, and until crossbeam 5 continues the lifting back, telescopic link 24 is taken out from fixed cover one 22 and fixed cover two 23 insides, and clamp plate 9 separates completely with the membrane this moment, has accomplished the operation of cutting the membrane in proper order promptly, repeats above step, can realize the operation of constantly cutting the membrane.

In another embodiment of the present invention, as shown in fig. 2, the transmission mechanism 10 includes a first counter-rotating motor 18 fixed on one side of the table top 1, and an output shaft of the first counter-rotating motor 18 is fixedly provided with a swing rod 17, the swing rod 17 is a telescopic rod, and a top end of the swing rod 17 is in transmission connection with a transmission rod 15 through a hinge shaft 16, a sliding block 12 is slidably clamped inside the sliding chute 4, and a pin shaft 13 is fixedly installed on an outer wall of one side of the sliding block 12, one end of the transmission rod 15 is fixed on the sliding block 12 through a shaft sleeve and the pin shaft 13, a spring 14 whose top end is in contact with the sliding block 12 is arranged inside the sliding chute 4, and a guide rod 11 penetrating to the outside of the upright column 3 is fixedly installed on an outer wall of the top of the sliding block 12.

The operator starts motor 18 that just reverses, it is rotatory to drive the swinging arms 17 by motor 18 that just reverses, swinging arms 17 can stretch out and draw back when rotatory simultaneously, can change the rotatory circular orbit of swinging arms, swinging arms 17 drives transfer line 15 through hinge 16 and rotates, drive slider 12 by transfer line 15 again and go up and down at the inside straight line of spout 4, finally drive the lift of crossbeam 5, and simultaneously, the spring 14 of adoption, can be when slider 12 goes up and down, play the effect of fine buffering, this transmission structure, the novel design, the operation is reliable, the lift of realization crossbeam 5 that can be quick, thereby can be fine drive divide cutter 6 to realize quick operation of cutting to the membrane.

In one embodiment provided by the invention, the outer walls of two sides of the top of the table top 1 are fixedly provided with fixed seats 19, a carrying shaft 21 is arranged between the two fixed seats 19, and the outer wall of one side of each fixed seat 19 is provided with a clamping groove 20 for clamping the carrying shaft 21;

the operator is the membrane material of lapping, install on carrying thing axle 21, concrete operation does, the operator earlier to carrying thing axle 21 from the inside taking out of draw-in groove 20, then to carrying thing axle 21 and alternate in the membrane material inner core department of lapping, then place carrying thing axle 21 on fixing base 19 through draw-in groove 20, can set up the bearing simultaneously and be connected carrying between thing axle 21 and fixing base 19, guarantee the rotation that the membrane material of lapping can be fine, the blowing of the membrane material of being convenient for.

In another embodiment provided by the invention, as shown in fig. 4 and 5, the rolling mechanism comprises bent frames 29 fixedly mounted on a cantilever 28, a plurality of rubber covered rollers 30 are arranged between the bent frames 29, one end of each rubber covered roller 30 is connected with a linkage wheel 31 through a shaft, a first belt 32 for synchronous transmission is arranged between the linkage wheels 31, a driving motor 36 is fixedly mounted on the outer wall of the top of the cantilever 28, a driving wheel 35 is fixedly mounted on an output shaft of the driving motor 36, a second belt 34 is connected on the outer wall of the driving wheel 35 in a transmission manner, a driven wheel 33 is arranged at one end, far away from the driving wheel 35, of the second belt 34, and the driven wheel 33 is fixed on the same shaft of one linkage wheel 31; the jacking mechanism 37 comprises a buffer sleeve 38 fixed on the outer wall of the top of the table board 1, a buffer spring 39 is fixedly installed inside the buffer sleeve 38, the buffer spring 39 is arranged, the buffer spring has a damping and buffering effect when the pull rod 40 ascends and descends, the smoothness of the mechanism motion is guaranteed, the pull rod 40 penetrating to the lower portion of the table board 1 is inserted into the buffer sleeve 38, a fixed disc 41 is fixedly installed on the outer wall of the bottom end of the pull rod 40, a forward and reverse rotating motor II 43 is fixedly installed below the table board 1, a cam 42 is fixedly installed on an output shaft of the forward and reverse rotating motor II 43, and the cam 42 is located at the top of the fixed disc 41 and is always in contact with the fixed disc 41;

after the film material is spread on the table board 1 for the first time, an operator starts a forward and reverse rotating motor 43, the forward and reverse rotating motor 43 drives the cam 42 to rotate and drives the fixed disc 41 and the pull rod 40 to descend, at the moment, the cantilever 28 descends through the sliding hole 27 and the moving block to drive the bent frame 29 to descend, so that the rubber rollers 30 are pressed above the film material, after the cutting of the film material for one time is completed, the driving motor 36 is started, the driving motor 36 drives the driven wheel 33 to rotate through the driving wheel 35, the belt II 34 drives the driven wheel 33 to rotate, the driven wheel 33 drives one of the rubber rollers 30 to rotate, and as the rubber rollers 30 are linked in series through the belt I32, all the rubber rollers 30 can rotate in the same step, the cut film material can be transmitted, and meanwhile, the rubber rollers on the other side of the upright post 3 can drive the rolled film material to be discharged, so as to realize the next cutting operation of the film material.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and are not to be construed as limiting the scope of the invention.

Claims

1. The utility model provides a protection cutting machine is kick-backed to slabstone membrane, includes mesa (1), its characterized in that, equal fixed mounting has stand (3) on the outer wall of mesa (1) top both sides, and opens spout (4) that have run through on one side outer wall of stand (3), the inside slip of spout (4) is pegged graft and is had crossbeam (5), and fixed mounting has branch cutter (6) on the bottom outer wall of crossbeam (5), equal fixed mounting has preforming subassembly (8) on the both sides outer wall of crossbeam (5), the below of mesa (1) one side is provided with drive mechanism (10) that are connected with crossbeam (5), the both sides of stand (3) all are provided with slide opening (27), and the inside of slide opening (27) is provided with cantilever (28) through the movable block, the end fixed mounting of cantilever (28) has rolling mechanism, the below of cantilever (28) is fixed to be provided with climbing mechanism (37) of installing on mesa (1).

2. The slitter for protecting rebound of a sheeting film according to claim 1, wherein a plurality of legs (2) are fixedly arranged at the bottom of the table top (1), and transverse connecting rods are fixedly arranged between the legs (2).

3. The cutting machine for protecting the rebound of the laminated film as claimed in claim 1, wherein the laminating assembly (8) comprises a fixing plate (7) fixedly mounted on the outer wall of the cross beam (5), a first fixing sleeve (22) is fixedly mounted on the outer wall of the bottom of the fixing plate (7), a telescopic rod (24) is inserted into the inner portion of the bottom end of the first fixing sleeve (22), and a second fixing sleeve (23) is sleeved on the outer portion of the bottom end of the telescopic rod (24).

4. The splitting machine for protecting rebound of sheet membranes as claimed in claim 3, wherein pressure springs (25) are respectively disposed in the spaces between the first fixing sleeve (22) and the second fixing sleeve (23) and the telescopic rod (24), and end caps (26) are respectively disposed at the top of the first fixing sleeve (22) and the bottom of the second fixing sleeve (22).

5. The slitter capable of protecting the rebound of the sheeting film as claimed in claim 4, wherein a horizontally arranged pressing plate (9) is fixedly mounted at the bottom of the sheeting assembly (8), and a non-slip mat is arranged on the outer wall of the bottom of the pressing plate (9).

6. The cutting machine for protecting rebound of a sheet film according to claim 1, wherein the transmission mechanism (10) comprises a first forward and reverse rotation motor (18) fixed on one side of the table top (1), an output shaft of the first forward and reverse rotation motor (18) is fixedly provided with a swing rod (17), the swing rod (17) is a telescopic rod, the top end of the swing rod (17) is in transmission connection with a transmission rod (15) through a hinge shaft (16), the inside of the sliding chute (4) is slidably clamped with a sliding block (12), a pin shaft (13) is fixedly arranged on the outer wall of one side of the sliding block (12), one end of the transmission rod (15) is fixed on the sliding block (12) through a shaft sleeve and the pin shaft (13), a spring (14) with the top end contacting the sliding block (12) is arranged inside the sliding chute (4), and a guide rod (11) penetrating through the outside of the upright column (3) is fixedly arranged on the outer wall of the top of the sliding block (12).

7. The cutting machine for protecting rebound of a sheet membrane according to claim 1, wherein fixing seats (19) are fixedly mounted on outer walls of two sides of the top of the table board (1), a loading shaft (21) is mounted between the two fixing seats (19), and a clamping groove (20) for clamping the loading shaft (21) is formed in an outer wall of one side of each fixing seat (19).

8. The cutting machine for rebound protection of sheeting films according to claim 1, wherein the rolling mechanism comprises bent frames (29) fixedly mounted on a cantilever (28), a plurality of rubber rollers (30) are arranged between the bent frames (29), one ends of the rubber rollers (30) are connected with linkage wheels (31) through shafts, a first belt (32) synchronously driven is arranged between the linkage wheels (31), a driving motor (36) is fixedly mounted on the outer wall of the top of the cantilever (28), a driving wheel (35) is fixedly mounted on an output shaft of the driving motor (36), a second belt (34) is connected to the outer wall of the driving wheel (35) in a transmission mode, a driven wheel (33) is arranged at one end, far away from the driving wheel (35), of the second belt (34), and the driven wheel (33) is fixed on the same shaft of one linkage wheel (31).

9. The protective slitting machine for the rebound of a sheet film as claimed in claim 1, wherein the jacking mechanism (37) comprises a buffer sleeve (38) fixed on the outer wall of the top of the table top (1), a buffer spring (39) is fixedly installed inside the buffer sleeve (38), a pull rod (40) penetrating to the lower side of the table top (1) is inserted into the inside of the buffer sleeve (38), a fixed disc (41) is fixedly installed on the outer wall of the bottom end of the pull rod (40), a forward and reverse motor II (43) is fixedly installed below the table top (1), a cam (42) is fixedly installed on an output shaft of the forward and reverse motor II (43), and the cam (42) is located at the top of the fixed disc (41) and is in contact with the fixed disc (41) all the time.

10. The protective slitting machine for the rebound of a sheet film as claimed in claim 1, wherein a through groove is formed on the outer wall of the top of the table top (1), and the specification of the through groove is matched with that of the slitting knife (6).