CN112249783A

CN112249783A - Film splitter

Info

Publication number: CN112249783A
Application number: CN202011043161.0A
Authority: CN
Inventors: 曹禹; 孙涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-01-22

Abstract

The invention relates to the field of splitting machines, in particular to a film splitting machine, which comprises a workbench, wherein a lifting splitting mechanism is in threaded connection with the workbench, and two pressing mechanisms are arranged on the lower surface of the lifting splitting mechanism, and the film splitting machine has the beneficial effects that: when using, the film can at first offset with the gyro wheel when cutting, later double-end driving motor can drive the threaded rod and rotate, and the threaded rod descends with the gyro wheel synchronization with the screw sleeve's cooperation drive mount pad and pushes down the film and tighten up, the gyro wheel can upwards promote the spring and contract simultaneously, and then make the film offset with dividing the cutter, all be provided with a no screw thread region simultaneously because of two screw sleeves in, make the mount pad can not continue to drive the mount pad and descend after descending to there being certain position, make double-end driving motor can drive the gyro wheel and continuously carry the film, and offset through film and dividing the cutter and carry out the processing of cutting.

Description

Film splitter

Technical Field

The invention relates to the field of splitting machines, in particular to a film splitting machine.

Background

The splitting machine is a mechanical device for splitting a wide film into a plurality of narrow materials, is particularly suitable for splitting the film, and needs to tighten up the film when the splitting machine splits the film so as to facilitate the splitting cutter to split the film.

The existing splitting machine can not control the tightening of the film when splitting operation is carried out, and then the front section part of the film can be damaged in the tightening process, and the film splitting machine can only be slowly adjusted in subsequent operation, so that certain waste is caused to the film, and the film splitting machine is necessary to provide.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a film splitting machine.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a film splitter, includes a workstation, threaded connection has a lift to cut mechanism on the workstation, the lower surface that the lift cut mechanism is provided with two hold-down mechanism, two hold-down mechanism's the common fixedly connected with conveying mechanism of lower extreme, actuating mechanism of last fixed surface of workstation is connected with, be connected between actuating mechanism and conveying mechanism and the lift cut mechanism, be provided with an guiding mechanism on the workstation on the position between actuating mechanism and the conveying mechanism.

The lifting splitting mechanism comprises two threaded rods which are vertical and connected to the workbench in a rotating mode through bearings, the lower ends of the threaded rods penetrate through the lower surface of the workbench and extend downwards, the threaded rods are located on the wall of the lower end rod outside the workbench and are connected with threaded sleeves in a threaded mode, the outer cylinder wall of each threaded sleeve is fixedly sleeved with a mounting seat, and the lower surface of the mounting seat is fixedly connected with a plurality of splitting cutters which are parallel and evenly spaced.

Specifically, two push down the mechanism and all include a fixed slot that is vertical form setting, two the lower surface at the mount pad is all seted up to the fixed slot, two all be the symmetry form on the relative cell wall of fixed slot and seted up two spouts, four equal sliding connection is by a slider, four in the spout the slider runs through the notch that corresponds the spout respectively and extends to the fixed slot in, four the one end that the slider is located two fixed slots is two dead levers of common fixedly connected with respectively, two of dead lever sliding connection respectively has in two fixed slots, two the lower extreme of dead lever all runs through the notch that corresponds the fixed slot and downwardly extending, two the equal fixedly connected with first spring in upper end of dead lever, two the equal fixed connection in upper end of first spring is at the tank bottom that corresponds the fixed slot.

Specifically, conveying mechanism includes two connecting blocks, two the lower surface of connecting block difference fixed connection at two dead levers, two be connected with a dwang through rotating through the bearing between the connecting block, be located two even fixed the cover that waits on the dwang pole wall between the connecting block has evenly connect a plurality of gyro wheel.

Specifically, the driving mechanism comprises a double-head driving motor which is fixedly connected with the upper surface of the workbench, two output ends of the double-end driving motor are fixedly connected with a driving rod through a coupler, the rod walls of the two driving rods corresponding to the two threaded rods are fixedly sleeved with a first bevel gear, the upper surfaces of the threaded rods corresponding to the two first bevel gears are fixedly connected with a second bevel gear respectively, the two first bevel gears are respectively meshed with the two second bevel gears, one ends of the two driving rods far away from the double-head driving motor are respectively fixedly connected with a first driving wheel, the two ends of the rotating rod corresponding to the positions of the two first driving wheels are fixedly connected with a second driving wheel, and the two ends of the rotating rod are connected with a driving belt in a common driving mode between the first driving wheel and the two second driving wheels.

Specifically, guiding mechanism includes two through-holes, two the through-hole runs through respectively and sets up on the workstation that corresponds two first drive wheel positions, two a T type spout has all been seted up on the lateral wall of one side in the through-hole opposite direction, two equal sliding connection has a T type slider in the T type spout, two wherein one end of T type slider runs through the notch that corresponds T type spout respectively and extends to in the through-hole, two one end that T type slider is located in the through-hole all is connected with a connecting rod through the bearing rotation, two the equal fixedly connected with of one end of T type slider is kept away from to the connecting rod has a third drive wheel, two the third drive wheel is connected with two drive belt transmission respectively, two all run through on the T type slider and set up a spacing hole, two equal sliding connection has a gag lever post in the spacing hole, two both ends of gag lever post run through the drill way that corresponds spacing hole respectively and outwards extend and fixed connection is at T type slip And on the opposite groove walls of the grooves, the side wall of one side of each of the two T-shaped sliding blocks is fixedly connected with a second spring, one ends of the second springs, far away from the T-shaped sliding blocks, are respectively connected with the corresponding groove walls of the two T-shaped sliding grooves, and the two second springs are respectively sleeved on the rod walls of the two limiting rods.

Specifically, the equal fixedly connected with bracing piece in four corners department of workstation lower surface, every two is adjacent equal common fixedly connected with a fixed plate between the bracing piece.

Specifically, the top end inner cylinder wall of each of the two threaded sleeves is provided with a thread-free area.

The invention has the beneficial effects that:

(1) the invention relates to a film splitting machine, which is characterized in that a threaded rod, threaded sleeves, a mounting seat, a splitting cutter, a fixed groove, a sliding block, a fixed rod, a first spring, a connecting block, a rotating rod, a roller, a double-head driving motor, a driving rod, a first bevel gear, a second bevel gear, a first driving wheel, a second driving wheel, a driving belt and a fixed plate are arranged, when the film splitting machine is used, the film can firstly abut against the roller when being split, then the double-head driving motor can drive the threaded rod to rotate, the mounting seat and the roller are driven to synchronously descend by the matching of the threaded rod and the threaded sleeves to press and tighten the film, meanwhile, the roller can upwards push the spring to retract, so that the film abuts against the splitting cutter, and simultaneously, as a non-threaded area is arranged in each of the two threaded sleeves, the mounting seat cannot continuously drive the mounting seat, make double-end driving motor can drive the gyro wheel and continuously carry the film to offset through film and branch cutter and cut processing.

(2) According to the film splitting machine, when the distance between the first driving wheel and the second driving wheel is adjusted, the second spring can push the T-shaped sliding block to move, the T-shaped sliding block can electrically drive the third driving wheel to move, and the driving belt can be sleeved between the first driving wheel and the second driving wheel all the time, so that the influence on the transmission between the first driving wheel and the second driving wheel is avoided.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a film slitting machine in a closed state according to the present invention;

FIG. 2 is a schematic structural view of a film splitter according to the present invention in a use state;

FIG. 3 is a schematic top view of a worktable of a film splitter according to the present invention;

FIG. 4 is a sectional view of a top view of a worktable of a film splitter according to the present invention;

FIG. 5 is a schematic bottom view of a mounting seat of a film slitting machine according to the present invention;

FIG. 6 is an enlarged schematic view of a portion A of FIG. 2 of the film slitting machine according to the present invention;

fig. 7 is an enlarged schematic structural view of a portion B in fig. 4 of the film slitting machine according to the present invention.

In the figure: 1. a work table; 2. a lifting and cutting mechanism; 21. a threaded rod; 22. a threaded sleeve; 23. a mounting seat; 24. a slitting knife; 3. a pressing mechanism; 31. fixing grooves; 32. a chute; 33. a slider; 34. fixing the rod; 35. a first spring; 4. a conveying mechanism; 41. connecting blocks; 42. rotating the rod; 43. a roller; 5. a drive mechanism; 51. a double-headed drive motor; 52. a drive rod; 53. a first bevel gear; 54. a second bevel gear; 55. a first drive pulley; 56. a second transmission wheel; 57. a transmission belt; 6. an adjustment mechanism; 61. a through hole; 62. a T-shaped chute; 63. a T-shaped slider; 64. a connecting rod; 65. a third transmission wheel; 66. a limiting hole; 67. a limiting rod; 68. a second spring; 7. a support bar; 8. and (7) fixing the plate.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-7, the film splitter according to the present invention comprises a working table 1, a lifting and splitting mechanism 2 is screwed on the working table 1, two pushing mechanisms 3 are disposed on the lower surface of the lifting and splitting mechanism 2, a conveying mechanism 4 is fixedly connected to the lower ends of the two pushing mechanisms 3, a driving mechanism 5 is fixedly connected to the upper surface of the working table 1, the driving mechanism 5 is connected to the conveying mechanism 4 and the lifting and splitting mechanism 2, an adjusting mechanism 6 is disposed on the working table 1 at a position between the driving mechanism 5 and the conveying mechanism 4, the lifting and splitting mechanism 2 is driven to descend by the driving mechanism 5, the pushing mechanisms 3 on the lifting and splitting mechanism 2 drive the conveying mechanism 4 to tighten the film, and the driving mechanism 5 drives the conveying mechanism 4 to convey the film, so that the film can be processed.

Specifically, the lifting splitting mechanism 2 comprises two threaded rods 21 which are vertically arranged, the two threaded rods 21 are rotatably connected to the workbench 1 through bearings, the lower ends of the two threaded rods 21 penetrate through the lower surface of the workbench 1 and extend downwards, the wall of the lower end rod, which is positioned outside the workbench 1, of the two threaded rods 21 is in threaded connection with a threaded sleeve 22, the outer cylinder wall of the two threaded sleeves 22 is fixedly sleeved with an installation seat 23, the lower surface of the installation seat 23 is fixedly connected with a plurality of dividing cutters 24 which are parallel, uniform and equidistant, the inner cylinder wall at the top end of the two threaded sleeves 22 is provided with a non-threaded area, the two threaded rods 21 can drive the installation seat 23 to descend through threaded engagement with the threaded sleeve 22, when the lower end of the threaded rod 21 extends to the non-threaded area of the threaded sleeve 22, continued rotation of threaded rod 21 will not continue to drive mounting block 23 further down.

Specifically, each of the two pressing mechanisms 3 includes a fixing groove 31 vertically disposed, each of the two fixing grooves 31 is disposed on the lower surface of the mounting seat 23, each of the two fixing grooves 31 has two sliding grooves 32 symmetrically disposed on opposite groove walls thereof, each of the four sliding grooves 32 is slidably connected with a sliding block 33, the four sliding blocks 33 respectively penetrate through the notches of the corresponding sliding grooves 32 and extend into the corresponding fixing groove 31, one ends of the four sliding blocks 33 located in the two fixing grooves 31 are respectively and fixedly connected with two fixing rods 34, the two fixing rods 34 are respectively and slidably connected with the two fixing grooves 31, the lower ends of the two fixing rods 34 respectively penetrate through the notches of the corresponding fixing grooves 31 and extend downward, the upper ends of the two fixing rods 34 are respectively and fixedly connected with a first spring 35, the upper ends of the two first springs 35 are respectively and fixedly connected with the groove bottoms of the corresponding fixing grooves 31, the conveying mechanism 4, the two connecting blocks 41 are respectively and fixedly connected to the lower surfaces of the two fixing rods 34, a rotating rod 42 is connected between the two connecting blocks 41 through a bearing in a rotating manner, a plurality of idler wheels 43 are uniformly and fixedly sleeved on the rod wall of the rotating rod 42 between the two connecting blocks 41, a supporting rod 7 is fixedly connected at the four corners of the lower surface of the workbench 1, a fixing plate 8 is fixedly connected between every two adjacent supporting rods 7, the mounting seat 23 drives the connecting blocks 41 to descend to be abutted against the fixing plate 8 through the fixing rods 34, the fixing rods 34 can move into the fixing grooves 31 when the mounting seat 23 descends through the support of the fixing plate 8 for the connecting blocks 41 and the fixing rods 34, meanwhile, the fixing rods 34 can be lifted upwards through the first springs 35 to support the mounting seat 23, and the mounting seat 23 is prevented from falling after the threaded sleeve 22 is disconnected from the threaded rod, the fixing rod 34 drives the connecting block 41 to move towards the mounting seat 23 synchronously, so that the connecting block 41 can drive the rotating rod 42 and the roller 43 to descend synchronously to tighten the film, and the distance between the connecting block and the mounting seat 23 is reduced, so that the film is abutted against the slitting knife 24.

Specifically, the driving mechanism 5 includes a double-headed driving motor 51, the double-headed driving motor 51 is fixedly connected to the upper surface of the worktable 1, two output ends of the double-headed driving motor 51 are fixedly connected with a driving rod 52 through a coupler, the rod walls of the two driving rods 52 corresponding to the positions of the two threaded rods 21 are fixedly sleeved with a first bevel gear 53, the upper surfaces of the threaded rods 21 corresponding to the positions of the two first bevel gears 53 are fixedly connected with a second bevel gear 54, the two first bevel gears 53 are respectively engaged with the two second bevel gears 54, one ends of the two driving rods 52 far away from the double-headed driving motor 51 are fixedly connected with a first driving wheel 55, two ends of the rotating rod 42 corresponding to the positions of the two first driving wheels 55 are fixedly connected with a second driving wheel 56, and a driving belt 57 is jointly connected between the two first driving wheels 55 and the two second driving, the adjusting mechanism 6 comprises two through holes 61, the two through holes 61 are respectively penetrated and opened on the workbench 1 corresponding to the two first driving wheels 55, a T-shaped sliding groove 62 is respectively opened on the side wall of one side of the two through holes 61 opposite to each other, a T-shaped sliding block 63 is respectively connected in the two T-shaped sliding grooves 62 in a sliding manner, one end of each of the two T-shaped sliding blocks 63 is respectively penetrated and connected with a notch of the corresponding T-shaped sliding groove 62 and extends into the through hole 61, one end of each of the two T-shaped sliding blocks 63 in the through hole 61 is respectively connected with a connecting rod 64 in a rotating manner through a bearing, one end of each of the two connecting rods 64 far away from the T-shaped sliding block 63 is respectively fixedly connected with a third driving wheel 65, the two third driving wheels 65 are respectively connected with the two driving belts 57 in a transmission manner, one limiting hole 66 is respectively penetrated and opened on the two T-shaped sliding blocks 63, one limiting rod 67 is respectively slidably connected in the two limiting On the opposite groove wall of the groove 62, a second spring 68 is fixedly connected to the side wall of one of the two T-shaped sliding blocks 63, one end of each of the two second springs 68 away from the T-shaped sliding block 63 is respectively connected to the corresponding groove wall of the two T-shaped sliding grooves 62, and the two second springs 68 are respectively sleeved on the rod walls of the two limiting rods 67, the rotating rod 42 can simultaneously drive the second transmission wheel 56 to descend when descending, so as to enlarge the distance between the first transmission wheel 55 and the second transmission wheel 56, at this time, the transmission belt 57 can be tightened and pull the third transmission wheel 65, the third transmission wheel 65 drives the T-shaped sliding block 63 to slide in the T-shaped sliding groove 62 through the connecting rod 64, so that the position of the third transmission wheel 65 can be adjusted, further, the length of the transmission belt 57 between the first transmission wheel 55 and the second transmission wheel 56 is adjusted, and meanwhile, the second spring 68 can push the T-shaped sliding block 63, the T-shaped sliding block 63 drives the third driving wheel 65 to move synchronously, the driving belt 57 can be tightened, looseness of the driving belt 57 in transmission is avoided, the driving rod 52 can drive the rotating rod 42 to rotate through matching between the first driving wheel 55 and the second driving wheel 56 and between the driving belt 57 when rotating, the rotating rod 42 drives the plurality of rollers 43 to convey the film, and the film is cut by contacting with the slitting knife 24 when being conveyed.

When the film fixing device is used, firstly, the upper surface of the film in the workbench 1 is abutted against the lower surfaces of the rollers 43, then the double-headed driving motor 51 can be started, the double-headed driving motor 51 drives the two driving rods 52 to rotate, the two driving rods 52 drive the two threaded rods 21 to rotate through the meshing of the first bevel gear 53 and the second bevel gear 54, the two threaded rods 21 can drive the mounting seat 23 to descend through the threaded meshing with the threaded sleeve 22, when the lower end of the threaded rod 21 extends to the unthreaded area of the threaded sleeve 22, the threaded rod 21 cannot drive the mounting seat 23 to descend continuously, meanwhile, the mounting seat 23 drives the connecting block 41 to descend through the fixing rod 34 to abut against the fixing plate 8, the fixing rod 34 moves towards the fixing groove 31 through the support of the fixing plate 8 on the connecting block 41 and the fixing rod 34, and simultaneously, the fixing rod 34 can be lifted upwards through the first spring 35 to support the mounting seat 23, the mounting seat 23 is prevented from falling off after the connection between the threaded sleeve 22 and the threaded rod 21 is released, the fixing rod 34 drives the connecting block 41 to synchronously move towards the mounting seat 23, so that the connecting block 41 synchronously drives the rotating rod 42 and the roller 43 to synchronously descend to tighten the film, the distance between the connecting block and the mounting seat 23 is also reduced, the film abuts against the slitting knife 24, the rotating rod 42 synchronously drives the second transmission wheel 56 to descend when descending, further, the distance between the first transmission wheel 55 and the second transmission wheel 56 is enlarged, at the moment, the transmission belt 57 is tightened and pulls the third transmission wheel 65, the third transmission wheel 65 drives the T-shaped sliding block 63 to slide in the T-shaped sliding groove 62 through the connecting rod 64, further, the position of the third transmission wheel 65 can be adjusted, and further, the length of the transmission belt 57 between the first transmission wheel 55 and the second transmission wheel 56 is adjusted, meanwhile, the second spring 68 can push the T-shaped sliding block 63, the T-shaped sliding block 63 drives the third transmission wheel 65 to move synchronously, the transmission belt 57 can be tightened, looseness during transmission is avoided, the driving rod 52 can drive the rotating rod 42 to rotate through matching between the first transmission wheel 55 and the second transmission wheel 56 and between the first transmission wheel and the transmission belt 57 when rotating, the rotating rod 42 drives the plurality of rollers 43 to convey the film, and the film is cut by contacting with the cutting knife 24 during conveying.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a film splitter, includes a workstation (1), its characterized in that, threaded connection has a lift to cut mechanism (2) on workstation (1), the lower surface of lift to cut mechanism (2) is provided with two pushing down mechanism (3), two the common fixedly connected with conveying mechanism (4) of lower extreme of pushing down mechanism (3), actuating mechanism (5) of last fixed surface of workstation (1) is connected with, be connected between actuating mechanism (5) and conveying mechanism (4) and the lift to cut mechanism (2), be provided with an adjustment mechanism (6) on workstation (1) on the position between actuating mechanism (5) and conveying mechanism (4).

2. A film slitting machine according to claim 1 wherein: go up and down to cut mechanism (2) including two threaded rod (21) that are vertical form setting, two threaded rod (21) all rotate through the bearing and connect on workstation (1), two the lower extreme of threaded rod (21) all runs through the lower surface and the downwardly extending of workstation (1), two equal threaded connection has a threaded sleeve (22), two on threaded rod (21) is located the outer lower extreme pole wall of workstation (1) common fixed cup joints a mount pad (23) on the urceolus wall of threaded sleeve (22), the lower surface of mount pad (23) is the even equidistance fixedly connected with a plurality of branch cutter (24) of parallel form.

3. A film slitting machine according to claim 1 wherein: the two pressing mechanisms (3) respectively comprise a fixing groove (31) which is vertically arranged, the two fixing grooves (31) are respectively arranged on the lower surface of the mounting seat (23), two sliding grooves (32) are symmetrically arranged on the opposite groove walls of the two fixing grooves (31), four sliding grooves (32) are respectively connected with a sliding block (33) in a sliding mode, the four sliding blocks (33) respectively penetrate through the notches of the corresponding sliding grooves (32) and extend into the fixing grooves (31), one ends of the four sliding blocks (33) which are positioned in the two fixing grooves (31) are respectively and fixedly connected with two fixing rods (34), the two fixing rods (34) are respectively and slidably connected into the two fixing grooves (31), the lower ends of the two fixing rods (34) respectively penetrate through the notches of the corresponding fixing grooves (31) and extend downwards, the upper ends of the two fixing rods (34) are respectively and fixedly connected with a first spring (35), the upper ends of the two first springs (35) are fixedly connected to the bottoms of the corresponding fixing grooves (31).

4. A film slitting machine according to claim 1 wherein: conveying mechanism (4) include two connecting blocks (41), two connecting block (41) fixed connection is respectively at the lower surface of two dead levers (34), two be connected with a dwang (42) through rotating between connecting block (41) through the bearing, be located two even equal fixed cover has connect a plurality of gyro wheel (43) on dwang (42) pole wall between connecting block (41).

5. A film slitting machine according to claim 1 wherein: the driving mechanism (5) comprises a double-end driving motor (51), the double-end driving motor (51) is fixedly connected to the upper surface of the workbench (1), two output ends of the double-end driving motor (51) are fixedly connected with a driving rod (52) through a coupler, the two driving rods (52) are fixedly sleeved on the rod wall corresponding to the positions of the two threaded rods (21), a first bevel gear (53) is fixedly connected to the upper surface of the threaded rod (21) corresponding to the positions of the two first bevel gears (53), the two first bevel gears (53) are respectively meshed with the two second bevel gears (54), one end of each driving rod (52) far away from the double-end driving motor (51) is fixedly connected with a first driving wheel (55), and the two ends of the rotating rod (42) corresponding to the positions of the two first driving wheels (55) are respectively and fixedly connected with a second driving wheel (56), and a transmission belt (57) is in transmission connection with the two first transmission wheels (55) and the two second transmission wheels (56) together.

6. A film slitting machine according to claim 1 wherein: the adjusting mechanism (6) comprises two through holes (61), the two through holes (61) are respectively arranged on the workbench (1) corresponding to the positions of the two first driving wheels (55) in a penetrating manner, the side walls of one opposite sides of the two through holes (61) are respectively provided with a T-shaped sliding groove (62), the two T-shaped sliding grooves (62) are respectively connected with a T-shaped sliding block (63) in a sliding manner, one end of each T-shaped sliding block (63) is respectively arranged in a penetrating manner through a notch of the corresponding T-shaped sliding groove (62) and extends into the through hole (61), one end of each T-shaped sliding block (63) in the through hole (61) is respectively connected with a connecting rod (64) in a rotating manner through a bearing, one end of each connecting rod (64) far away from the T-shaped sliding block (63) is respectively and fixedly connected with a third driving wheel (65), and the two third driving wheels (65) are respectively in transmission connection, two all run through on T type slider (63) and seted up one spacing hole (66), two equal sliding connection has a gag lever post (67) in spacing hole (66), two the both ends of gag lever post (67) run through the drill way that corresponds spacing hole (66) respectively and outwards extend and fixed connection on the relative cell wall of T type spout (62), two equal fixedly connected with a second spring (68) on the lateral wall of one side wherein of T type slider (63), two the one end that T type slider (63) were kept away from in second spring (68) is connected with the corresponding cell wall of two T type spouts (62) respectively, and two second spring (68) overlap respectively establish with the pole wall of two gag lever posts (67) on.

7. A film slitting machine according to claim 1 wherein: the equal fixedly connected with bracing piece (7) of four corners department of workstation (1) lower surface, every two are adjacent equal common fixedly connected with a fixed plate (8) between bracing piece (7).

8. A film slitting machine according to claim 2 wherein: the top end inner cylinder walls of the two threaded sleeves (22) are respectively provided with a thread-free area.