TWI723926B - Adjustable film stripping structure - Google Patents

Abstract

An adjustable film stripping structure comprises an upper film stripping element and a left and a right support. An upper roller unit of the upper film stripping element has a first and a second upper lever. A lower roller unit comprises a first and a second lower lever. Two ends of plural first belts respectively surround the first upper lever and the first lower lever, and two ends of plural second belts respectively surround the second upper lever and the second lower lever. A first, a second, and a third middle levers of a middle roller unit respectively press against the middle position of the plural first and second belts, so that the plural first and second belts bend upward and extend toward the back side of the film stripping apparatus with an angle for stripping the film of a thin plate on a film stripping apparatus. The left and right supports are provided respectively on two sides of the film stripping apparatus. The left and right ends of the three middle levers respectively connect the left and right supports, and at least one of the middle levers can be positioned after horizontal translation.

Description

Adjustable film tear-off structure

This creation is related to an adjustable film tearing structure of a film tearing machine, especially one that can adjust the closeness or adjacent gaps between a plurality of first belts and a plurality of second belts to effectively clamp the film and smooth it. Drives the film movers.

In the manufacturing process of printed circuit boards, before the substrate is exposed, a photoresist layer and a film adhered to the surface of the photoresist layer are formed on the upper and lower surfaces of the substrate, respectively. After the exposure, the film is peeled off to make the photoresist The layer is exposed for subsequent development and etching procedures. The existing method of peeling off the film by the film tearing machine mainly uses a front conveying section to convey the above-mentioned printed circuit board and other thin plates, so that the thin plates are moved along the conveying direction from front to back, and the thin plates are blocked and positioned by a blocking unit. After rolling on the surface of the film through a set of embossing wheels, the sheet will continue to be transported back along a rear conveying section, and a set of adhesive wheels will gradually peel off the wrinkled film on the front edge.

However, because the thickness of the general substrate itself is not large, it is easy to bend and uneven. When the long straight cylindrical adhesive wheel with the same outer diameter is adhered to the film, the adhesive force of each adhesive position is not completely the same, and the thickness of the film is very thin. It is also fragile. Therefore, it is often impossible to gradually peel off the film smoothly and comprehensively, and there will still be some film chips sticking to the surface of the photoresist layer, and often because the area of the film chips is too small to be detected It is measured that this phenomenon will cause the substrate to face scrap in the entire printed circuit board manufacturing process.

Therefore, as shown in the "Film Tear-off Structure" in the Republic of China Announcement No. I652172 filed by this creator, a solution is provided, which mainly includes an upper peeling film member, and the upper peeling film member includes adjacent The first upper pulley set and the second upper pulley set, and the first upper pulley set and the second upper pulley set are rotated in opposite directions, so that the film is sandwiched between the plurality of first belts and the plurality of second belts , So that the film will be peeled off along the front edge of the film.

However, in the actual film peeling process, since the adhesion between the first upper pulley set and the second upper pulley set is fixed, after the belt is used for a period of time, the clamping force of the film is likely to be weakened, thereby affecting the film Moreover, for films of different thicknesses, the use of the two pulley sets with a fixed gap is also limited, and even the expected effect cannot be achieved.

In view of this, in order to provide a structure that is different from the conventional technology and improve the above-mentioned shortcomings, the inventor has accumulated many years of experience and continuous research and development improvements, and this creation was born.

One purpose of this creation is to provide an adjustable film tear-off structure, which can solve the tightness or gap between the plurality of first belts and the plurality of second belts of the conventional film tear-off structure, so that the film clamping force can be fixed. The weakening affects the smooth movement of the film, and the problem that it cannot be effectively applied to the clamping and movement of films of different thicknesses, and the closeness or adjacent gaps between the plurality of first belts and the plurality of second belts can be adjusted as needed The change, in order to maintain the appropriate clamping force, to effectively clamp the film and smoothly drive the film to move.

In order to achieve the purpose of the above creation, the adjustable film tear-off structure set up in this creation is for peeling the thin film on a tearing machine. The front end of the tearing machine has a front conveying section for conveying the thin plates. The thin plates pass through the blocking unit and The blocking and positioning of the clamping unit, and then through a set of embossing wheels on the film After rolling on the surface, let the sheet continue to be transported backwards along the rear conveying section, and at the same time, it is clamped by the plurality of first belts and the plurality of second belts of the upper film stripper to peel off the film above the sheet. Its main technical characteristics It lies in: the adjustable film tearing structure of this creation includes the upper film stripping member, the upper film stripping member further includes an upper wheel group, a middle wheel group and a lower wheel group, and the upper wheel group includes the first that is arranged side by side and rotates in the opposite direction. The upper wheel rod and the second upper wheel rod, the lower wheel set includes a first lower wheel rod and a second lower wheel rod that are arranged at intervals and rotate in opposite directions. The two ends of a plurality of first belts respectively surround the first upper wheel rod and The two ends of the first lower wheel rod and the plurality of second belts respectively encircle the second upper wheel rod and the second lower wheel rod; the middle wheel set includes the first middle wheel rod, the second middle wheel rod and the third middle wheel rod, The first middle wheel rod, the second middle wheel rod and the third middle wheel rod respectively press against the middle positions of the plural first belts and the plural second belts, so that the plural first belts and the plural second belts are first The front end of the film tearing machine extends upward, and then at an angle toward the rear end of the film tearing machine; and, one side of the film tearing machine is provided with a left support frame, and the other side of the film tearing machine is provided with a right support frame. The left and right ends of the first middle wheel rod, the second middle wheel rod and the third middle wheel rod are respectively connected to the left support frame and the right support frame, and at least one of the second middle wheel rod and the third middle wheel rod It can be positioned after moving horizontally forward or backward relative to the first middle wheel rod.

During implementation, this creation further includes a left positioning plate and a right positioning plate. The left positioning plate is connected to the left support frame in a way that can be moved relatively horizontally and then positioned. The left positioning plate has a first left positioning hole and a second left positioning hole for Correspondingly locate the left end of the first middle wheel rod and the left end of the second middle wheel rod; the right positioning plate is connected to the right support frame in a way that can be moved relatively horizontally and then positioned. The right positioning plate has a first right positioning hole and a second right positioning Holes for corresponding positioning of the right end of the first middle wheel rod and the right end of the second middle wheel rod.

In implementation, the left support frame has a left guide groove, the left end of the first middle wheel rod and the second The left end of the middle wheel rod passes through the left guide groove at the same time, and is fixed on the left support frame with at least one left collar.

Another adjustable film tear-off structure set up in this creation, the left and right ends of the first middle wheel rod, the second middle wheel rod and the third middle wheel rod are respectively connected to the left support frame and the right support frame, and the first A middle wheel bar, a second middle wheel bar and a third middle wheel bar can be positioned horizontally moving forward or backward relative to the left support frame and the right support frame at the same time.

In implementation, the above-mentioned adjustable film tear-off structure further includes a left positioning plate and a right positioning plate. The left positioning plate is connected to the left support frame in a manner that can be moved relatively horizontally and then positioned. The left positioning plate has a first left positioning hole, The second left positioning hole and the third left positioning hole are used to locate the left end of the first middle wheel rod, the left end of the second middle wheel rod, and the left end of the third middle wheel rod; the right positioning plate can be positioned after moving relatively horizontally The right support frame is connected with the right support frame. The right positioning plate has a first right positioning hole, a second right positioning hole and a third right positioning hole for corresponding positioning of the right end of the first middle wheel rod, the right end of the second middle wheel rod and the third The right end of the middle wheel rod.

In implementation, the left support frame has a left guide groove, the left end of the first middle wheel rod, the left end of the second middle wheel rod, and the left end of the third middle wheel rod pass through the left guide groove at the same time, and at least one left collar Fixed on the left support frame.

In implementation, the left support frame has an upper guide groove and a lower guide groove. The upper guide groove and the lower guide groove are respectively parallel to the left guide groove and are respectively located at the upper and lower ends of the left guide groove; at least one left sleeve ring at the upper and lower ends Pass at least one screw through the upper guide groove and the lower guide groove respectively to connect the left positioning plate.

When implemented, this creation further includes a positioning piece, which connects the left support frame and the left positioning plate, so that the left positioning plate can be positioned on the left support frame after the left positioning plate moves relatively horizontally.

In implementation, one side of the left positioning plate has a first bent plate, one side of the left support frame has a second bent plate, one end of the positioning piece is connected to the first bent plate, and the other end of the positioning piece is connected to the second Bent plate, and the positioning part is a combination of bolts and nuts.

In order to further understand the creation, the following is a preferred embodiment, in conjunction with the drawings and figure numbers, the specific content of the creation and the effects achieved are described in detail as follows.

1: Adjustable film tear-off structure

10: Tear film machine

101: Left support plate

11: Thin plate

111,112: Film

12: Front conveying section

13: blocking unit

14: Clamping unit

15: Embossing wheel

16: blowing unit

17: Rear conveying section

18: Upper containment box

19: Lower stripping film

191: The first lower pulley group

192: The second lower pulley group

2: Upper stripping film piece

21: The first belt

22: second belt

23: Last wheel

231: First Upper Wheel Rod

232: second upper wheel lever

24: Intermediate wheel group

241: First Middle Wheel Rod

242: second middle wheel rod

243: Third Middle Wheel Rod

25: next round

251: The first lower wheel rod

252: second lower wheel lever

3: Left support frame

31: Left guide groove

32: Upper guide groove

33: Lower guide groove

34: second bending plate

4: Left positioning board

41: The first left positioning hole

42: The second left positioning hole

43: The third left positioning hole

44: The first bending plate

45: positioning parts

5: Right support frame

6: Right positioning plate

61: The first right positioning hole

62: The second right positioning hole

7: left collar

Figure 1 is a schematic diagram of the preferred embodiment of the creation when it is installed on the film tearing machine.

Figure 2 is a schematic diagram of the three-dimensional appearance of the preferred embodiment of the creation installed on the film tearing machine.

Figure 3 is an exploded view of some components of the preferred embodiment of the creation.

Figure 4 is a schematic diagram of the use state of the preferred embodiment of the creation.

Please refer to Figure 1. The adjustable film tear-off structure 1 of this creation is for peeling off at least one film (111, 112) of a thin plate 11 on the film tearing machine 10. The thin plate 11 is a printed circuit board or the like. . In implementation, one end of the input sheet 11 of the film tearing machine 10 is defined as the front end of the film tearing machine 10, and one end of the output sheet 11 is defined as the rear end of the film tearing machine 10, and the front end of the film tearing machine 10 has a front conveying section 12 for conveying. The thin plate 11 is moved along the conveying direction from the front end to the rear end of the film tearing machine 10. The thin plate 11 is blocked and positioned by a blocking unit 13 and a clamping unit 14, and then rolled on the surface of the film 111 through a set of embossing wheels 15 to form wrinkles on the front edge of the film 111, and then blown by a blowing unit 16 , Let the thin plate 11 continue to move backward along a rear conveying section 17 to peel off the film 111, and at the same time be clamped by a plurality of first belts 21 and a plurality of second belts 22 of an upper film stripping member 2 to peel off the upper part of the thin plate 11 The film 111 makes the film 111 fall into an upper containing box 18. The upper film stripping element 2 and the lower film stripping element 19 are respectively located at the upper and lower ends of the rear conveying section 17; and the lower film stripping element 19 includes a first lower pulley set 191 and a second lower pulley set 192 adjacent to each other. The lower pulley set 191 and the second lower pulley set 192 are opposite The film 112 is rotated downward to clamp and drive the film 112 downward, so that the film 112 falls into the lower containing box under the lower film stripping member 19.

Please refer to Figures 2 to 4, which is a preferred embodiment of the creative adjustable film tear-off structure 1, which mainly includes an upper stripping piece 2, a left support frame 3, a left positioning plate 4, and a right support The frame 5 and a right positioning plate 6, wherein the upper film stripping member 2 further includes an upper wheel group 23, a middle wheel group 24 and a lower wheel group 25. The upper wheel set 23 includes a first upper wheel rod 231 and a second upper wheel rod 232 that are arranged at intervals and rotate in opposite directions; the lower wheel set 25 includes a first lower wheel rod 251 and a second lower wheel rod that are arranged at intervals and rotate in opposite directions. Wheel bar 252, the upper and lower ends of a plurality of first belts 21 arranged at intervals respectively surround the first upper wheel bar 231 and the first lower wheel bar 251, and the upper and lower ends of a plurality of second belts 22 arranged at intervals Surround the second upper wheel rod 232 and the second lower wheel rod 252 respectively. The middle wheel set 24 is located in the middle front position between the upper wheel set 23 and the lower wheel set 25. The middle wheel set 24 includes a first middle wheel rod 241, a second middle wheel rod 242, and a third middle wheel rod arranged side by side. 243. The first middle wheel rod 241 is accommodated in the first belt 21, the second middle wheel rod 242 is accommodated in the second belt 22, and the third middle wheel rod 243 presses the second belt 22 forward and transversely. The two wheel rods are arranged horizontally at intervals, and the first middle wheel rod 241, the second middle wheel rod 242, and the third middle wheel rod 243 respectively press against the middle positions of the plurality of first belts 21 and the plurality of second belts 22, thereby allowing The plurality of first belts 21 and the plurality of second belts 22 extend upward and diagonally from the bottom to the top in the front end direction of the film tearing machine 10, and then extend upward toward the rear end direction of the film tearing machine 10 at an obtuse angle.

The left support frame 3 is a rectangular bent plate. The bottom edge of the left support frame 3 is connected to the top of a left support plate 101 on the left side of the film tearing machine 10. The left support frame 3 has a long left guide groove 31 on the plate surface. , The upper and lower ends of the left guide groove 31 are respectively provided with an upper guide groove 32 and a lower guide groove 33. The upper guide groove 32, the lower guide groove 33 and the left guide groove 31 are parallel to each other, and one side of the left support frame 3 is bent To form a second bent plate 34.

The left positioning plate 4 is a rectangular bent plate, and the surface of the left positioning plate 4 is horizontal The first left positioning hole 41, the second left positioning hole 42, and the third left positioning hole 43 are arranged at intervals in the direction. One side of the left positioning plate 4 is bent to form a first bent plate 44. When the left positioning plate 4 is close to When the left support frame 3 is held, the first bent plate 44 and the second bent plate 34 are parallel to each other. One end of a bolt is connected to the plate surface of the first bent plate 44, and the other end of the bolt passes through the second bent plate 34 and is locked with a nut so that the first bent plate 44 and the second bent plate 34 keep a certain distance; in implementation, the first bent plate 44 can also have nuts on the plate surface, and after the bolts pass through the second bent plate 34 and the first bent plate 44 in sequence, turn the head of the bolt to adjust And fix the horizontal distance between the first curved plate 44 and the second curved plate 34; the combination of the bolt and the nut is combined as a positioning member 45.

The left end of the first middle wheel rod 241, the left end of the second middle wheel rod 242, and the left end of the third middle wheel rod 243 respectively pass through the first left positioning hole 41, the second left positioning hole 42, and the third left positioning plate 4 After the left positioning hole 43, it passes through the elongated left guide groove 31 of the left support frame 3 at the same time. The left end of each middle wheel rod is respectively sleeved with a left collar 7, and on the three left collars 7, After the lower ends are screwed through the upper guide groove 32 and the lower guide groove 33 respectively, the left support frame 3 and the left positioning plate 4 are connected together, and at the same time, the left positioning plate 4, the left end of the first middle wheel rod 241, The left end of the second middle wheel rod 242 and the left end of the third middle wheel rod 243 can be positioned after being horizontally moved forward or backward relative to the left support frame 3 at the same time.

The right support frame 5 and the left support frame 3 have corresponding shapes, the right positioning plate 6 and the left positioning plate 4 have corresponding shapes, and the right support frame 5 and the right positioning plate 6 are respectively connected and fixed to the film tearing machine 10 On the left and right sides, the right positioning plate 6, the right end of the first middle wheel rod 241, the right end of the second middle wheel rod 242, and the right end of the third middle wheel rod 243 can simultaneously support the right The frame 5 is positioned after moving horizontally forward or backward. After collocation of the left positioning plate 4, the left end of the first middle wheel rod 241, the left end of the second middle wheel rod 242, and the left end of the third middle wheel rod 243, the plurality of first belts 21 and The tightness or adjacent gaps between the plurality of second belts 22 to maintain Proper clamping force can effectively clamp the film 111 and smoothly drive the film 111 to move.

In another embodiment, the left and right ends of the third middle wheel rod 243 can also be fixed on the left support frame 3 and the right support frame 5. In implementation, the left and right ends of the third middle wheel rod 243 It can also be directly fixed on the left and right sides of the film tearing machine 10. The left positioning plate 4 has a first left positioning hole 41 and a second left positioning hole 42 for correspondingly positioning the left end of the first middle wheel rod 241 and the left end of the second middle wheel rod 242, and the right positioning plate 6 has a first right positioning The hole 61 and the second right positioning hole 62 are used to position the right end of the first middle wheel rod 241 and the right end of the second middle wheel rod 242 correspondingly, and enable the left positioning plate 4 to move horizontally relative to the left support frame 3 for positioning On the left support frame 3, the right positioning plate 6 can be positioned on the right support frame 4 after moving horizontally relative to the right support frame 4 at the same time. In addition, the first middle wheel rod 241, the second middle wheel rod 242, and the third middle wheel rod 243 can also move independently relative to the left support frame 3 and the right support frame 5, and are separately fixed on the upper left support frame 3 and the right support frame. On the support frame 5, the closeness or the adjacent gap between the plurality of first belts 21 and the plurality of second belts 22 can also be adjusted.

Therefore, this creation has the following advantages:

1. The first middle wheel rod, the second middle wheel rod and the third middle wheel rod of this creation can move horizontally independently, or the first middle wheel rod and the second middle wheel rod can move horizontally at the same time, or three middle wheels The rods move horizontally at the same time. Therefore, the tightness or adjacent gaps between the plurality of first belts and the plurality of second belts can be changed as needed to maintain proper clamping force to effectively clamp the film and smoothly Drive the film to move.

2. This creation can adjust and fix the relative horizontal distance between the support frame and the positioning plate through a positioning piece, so it can more conveniently and accurately control the first middle wheel rod, the second middle wheel rod and the third middle wheel The horizontal movement distance of the rod, and after the three middle wheel rods are moved and positioned, it can effectively avoid moving again due to the pressure of each belt, so that the three middle wheel rods can form a stable support.

In summary, based on the content disclosed above, this creation can indeed achieve the expected purpose, providing a way to adjust the clamping force between the belts, to effectively clamp the film and smoothly drive the film to move, and can The adjustable film tear-off structure that allows each middle wheel rod to form a stable support is of great value for industrial use. Yan filed an invention patent application in accordance with the law.

1: Adjustable film tear-off structure

10: Tear film machine

101: Left support plate

2: Upper stripping film piece

21: The first belt

22: second belt

23: Last wheel

231: First Upper Wheel Rod

232: second upper wheel lever

24: Intermediate wheel group

241: First Middle Wheel Rod

242: second middle wheel rod

243: Third Middle Wheel Rod

25: next round

251: The first lower wheel rod

252: second lower wheel lever

3: Left support frame

31: Left guide groove

32: Upper guide groove

33: Lower guide groove

34: second bending plate

4: Left positioning board

41: The first left positioning hole

42: The second left positioning hole

43: The third left positioning hole

44: The first bending plate

45: positioning parts

5: Right support frame

6: Right positioning plate

61: The first right positioning hole

62: The second right positioning hole

7: Left loop

Claims (9)

An adjustable film tearing structure for peeling a thin film on a tearing machine, wherein one end of the input sheet is defined as the front end of the tearing machine, and one end of the output sheet is defined as the rear end of the tearing machine. The front end of the film machine has a front conveying section for conveying the thin plate to move along the conveying direction from the front end to the rear end. The thin plate is blocked by a blocking unit and a clamping unit and positioned on the surface of the film through a set of embossing wheels. After rolling, let the thin plate continue to be conveyed back along a rear conveying section, while being clamped by a plurality of first belts and a plurality of second belts of an upper stripping member to peel off the film above the thin plate, characterized in that: The adjustable film tear-off structure includes the upper film stripping member, the upper film stripping member further includes an upper wheel set, an intermediate wheel set, and a lower wheel set. The upper wheel set includes a first wheel set parallel to each other and rotating in the opposite direction. An upper wheel rod and a second upper wheel rod. The lower wheel set includes a first lower wheel rod and a second lower wheel rod that are arranged spaced apart and rotated in opposite directions. Both ends of the plurality of first belts respectively surround the The first upper wheel bar and the first lower wheel bar, the two ends of the plurality of second belts respectively surround the second upper wheel bar and the second lower wheel bar; the middle wheel set includes a first middle wheel bar, A second middle wheel rod and a third middle wheel rod, the first middle wheel rod, the second middle wheel rod and the third middle wheel rod respectively press against the plurality of first belts and the plurality of second belts The middle section position, so that the plurality of first belts and the plurality of second belts first extend upward in the direction of the front end of the film tearing machine, and then extend upward at an angle toward the direction of the rear end of the film tearing machine; and the film tearing machine One side of the machine is provided with a left support frame, the other side of the film tearing machine is provided with a right support frame, the left and right ends of the first middle wheel rod, the second middle wheel rod and the third middle wheel rod The left support frame and the right support frame are respectively connected, and at least one of the second middle wheel rod and the third middle wheel rod can be positioned after being horizontally moved forward or backward relative to the first middle wheel rod. For example, the adjustable film tear-off structure described in item 1 of the scope of patent application further includes a left positioning plate and a right positioning plate. The left positioning plate is connected to the left support frame in such a way that it can be moved relatively horizontally and positioned. The left positioning plate has a first left positioning hole and a second left positioning hole for correspondingly positioning the left end of the first middle wheel rod and the left end of the second middle wheel rod; the right positioning plate is relatively horizontally movable The right support frame is connected with the rear positioning method. The right positioning plate has a first right positioning hole and a second right positioning hole for corresponding positioning of the right end of the first middle wheel rod and the right end of the second middle wheel rod. The adjustable film tear-off structure described in item 2 of the scope of patent application, wherein the left support frame has a left guide groove, and the left end of the first middle wheel rod and the left end of the second middle wheel rod pass through the left at the same time The guide groove is fixed on the left support frame with at least one left collar. An adjustable film tearing structure for peeling a thin sheet film on a tearing machine, wherein one end of the input sheet is defined as the front end of the tearing machine, and one end of the output sheet is defined as the rear end of the tearing machine. The front end of the film machine has a front conveying section for conveying the thin plate to move along the conveying direction from the front end to the rear end. The thin plate is blocked by a blocking unit and a clamping unit and positioned on the surface of the film through a set of embossing wheels. After rolling, let the thin plate continue to be conveyed back along a rear conveying section, while being clamped by a plurality of first belts and a plurality of second belts of an upper stripping member to peel off the film above the thin plate, characterized in that: The adjustable film tear-off structure includes the upper film stripping member, the upper film stripping member further includes an upper wheel set, an intermediate wheel set, and a lower wheel set. The upper wheel set includes a first wheel set parallel to each other and rotating in the opposite direction. An upper wheel rod and a second upper wheel rod. The lower wheel set includes a first lower wheel rod and a second lower wheel rod that are arranged spaced apart and rotated in opposite directions. Both ends of the plurality of first belts respectively surround the The first upper wheel rod and the first lower wheel rod, both ends of the plurality of second belts respectively encircle the second The upper wheel rod and the second lower wheel rod; the middle wheel set includes a first middle wheel rod, a second middle wheel rod and a third middle wheel rod arranged in parallel at intervals, the first middle wheel rod, the second middle wheel rod The middle wheel rod and the third middle wheel rod respectively press against the middle section positions of the plurality of first belts and the plurality of second belts, so that the plurality of first belts and the plurality of second belts can tear the film first The front end of the machine extends upward, and then at an angle toward the rear end of the film tearing machine; and one side of the film tearing machine is provided with a left support frame, and the other side of the film tearing machine is provided with a right support frame, The left and right ends of the first middle wheel rod, the second middle wheel rod and the third middle wheel rod are respectively connected to the left support frame and the right support frame, and the first middle wheel rod and the second middle wheel rod The wheel bar and the third middle wheel bar can be positioned after being horizontally moved forward or backward relative to the left support frame and the right support frame at the same time. For example, the adjustable film tear-off structure described in item 4 of the scope of patent application further includes a left positioning plate and a right positioning plate. The left positioning plate is connected to the left support frame in a manner that can be moved relatively horizontally and then positioned. The left positioning plate has a first left positioning hole, a second left positioning hole and a third left positioning hole for corresponding positioning of the left end of the first middle wheel rod, the left end of the second middle wheel rod and the third The left end of the middle wheel rod; the right positioning plate is connected to the right support frame in a way that can be relatively horizontally moved and then positioned. The right positioning plate has a first right positioning hole, a second right positioning hole and a third right positioning Holes for correspondingly positioning the right end of the first middle wheel rod, the right end of the second middle wheel rod, and the right end of the third middle wheel rod. The adjustable film tear-off structure described in item 5 of the scope of patent application, wherein the left support frame has a left guide groove, the left end of the first middle wheel rod, the left end of the second middle wheel rod, and the third middle rod The left end of the wheel rod passes through the left guide groove at the same time, and is fixed on the left support frame with at least one left collar. The adjustable film tear-off structure described in item 3 or 6 of the scope of patent application, wherein the left support frame There is an upper guide groove and a lower guide groove. The upper guide groove and the lower guide groove are respectively parallel to the left guide groove and are respectively located on the upper and lower ends of the left guide groove; on the at least one left collar, At least one screw passes through the upper guide groove and the lower guide groove at the lower two ends to connect the left positioning plate. For example, the adjustable film tear-off structure described in item 3 or 6 of the scope of the patent application further includes a positioning member that connects the left support frame and the left positioning plate, and after the left positioning plate is relatively horizontally moved, Positioned on the left support frame. The adjustable film tear-off structure described in item 8 of the scope of patent application, wherein one side of the left positioning plate has a first curved plate, one side of the left support frame has a second curved plate, and the positioning member One end is connected with the first bent plate, the other end of the positioning piece is connected with the second bent plate, and the positioning piece is a combination of a bolt and a nut.

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