Film pasting equipment

Abstract

The utility model relates to the technical field of film pasting, and provides film pasting equipment. The film pasting equipment comprises a film loading mechanism, a film guiding mechanism, a transferring mechanism, a cutting mechanism and a film folding mechanism. The film loading mechanism is used for loading strip-shaped rolled film materials. The film guiding mechanism is provided with a first channel and a second channel which intersect with each other, and the first channel is used for positioning a film material. The transferring mechanism is used for driving the workpiece to move and move relative to the first channel for film pasting. The cutting mechanism is arranged on one side of the film guiding mechanism and corresponds to one end of the second groove channel. The cutting mechanism comprises a cutter used for stretching into the second groove channel to cut the film materials. And the film folding mechanism is arranged on the other side of the film guiding mechanism and corresponds to the other end of the second channel, the film folding mechanism comprises a film folding piece extending into the second channel, and the film folding piece is used for overturning out of the second channel so as to drive one end of the cut film material to be overturned. By means of the film pasting equipment, the film tearing efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film pasting, and particularly relates to a film pasting device. BACKGROUND

[0002] At present, when a workpiece is processed, a film needs to be pasted to protect the appearance surface of the workpiece, and the film is torn off after the workpiece is processed. However, after the workpiece is pasted by the existing film pasting device, the end of the rear film is attached to the surface of the workpiece, and a tool or a fingernail needs to be used to lift the film when the film is torn off, so that the film tearing efficiency is low. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a film pasting device capable of improving the film tearing efficiency.

[0004] An embodiment of the present application provides a film pasting device, which comprises a film loading mechanism, a film guiding mechanism, a workpiece moving mechanism, a film cutting mechanism and a film folding mechanism. The film loading mechanism is used for loading a roll-shaped film material. The film guiding mechanism is arranged on one side of the film loading mechanism and is provided with intersecting first and second grooves. The first groove is used for positioning the film material. The workpiece moving mechanism is arranged on one side of the film guiding mechanism and corresponds to the first groove. The workpiece moving mechanism is used for moving the workpiece and moving relative to the first groove to paste the film. The film cutting mechanism is arranged on one side of the film guiding mechanism and corresponds to one end of the second groove. The film cutting mechanism comprises a cutting knife used for cutting the film material in the second groove. The film folding mechanism is arranged on the other side of the film guiding mechanism and corresponds to the other end of the second groove. The film folding mechanism comprises a film folding piece extending into the second groove. The film folding piece is used for turning out of the second groove to fold one end of the cut film material.

[0005] When the film pasting device pastes the film, the workpiece moving mechanism moves the workpiece to paste the film material in the first groove on the outer surface of the workpiece and moves relative to the first groove to complete the film pasting of the workpiece. The film pasting process does not need manual participation, and the film pasting efficiency is improved. Further, after the film cutting mechanism cuts the film material, the film folding piece of the film folding mechanism extends into the second groove and turns out of the second groove to fold one end of the cut film material, so that a handle is formed. The film can be directly torn off at the handle in the subsequent process without the aid of an auxiliary tool, and the film tearing efficiency is improved.

[0006] In some embodiments of the present application, the film guiding mechanism comprises a guide plate and at least two film suction devices. The guide plate is provided with the second groove. The at least two film suction devices are arranged on the guide plate and are arranged on both sides of the second groove in sequence along the conveying direction of the film material to suck the film material.

[0007] In some embodiments of the present application, the transferring mechanism comprises a moving assembly and a rotating assembly, the rotating assembly is arranged on the moving assembly, when the moving assembly drives the rotating assembly to move, the rotating assembly rotates to drive the workpiece to rotate and move relative to the first channel to perform the film pasting.

[0008] In some embodiments of the present application, the moving assembly comprises a first moving assembly and a second moving assembly, the second moving assembly is arranged on the first moving assembly; the first moving assembly is used to drive the second moving assembly to move in a first direction; the second moving assembly is used to move relative to the first moving assembly in a second direction, the first direction is perpendicular to the second direction and located in the same horizontal plane.

[0009] In some embodiments of the present application, the film pasting device further comprises a roller assembly, the roller assembly is arranged on a side away from the film loading mechanism and corresponds to the first channel, the roller assembly is used to abut against the workpiece to roll the film material on the workpiece.

[0010] In some embodiments of the present application, the width of the film folding piece is less than the width of the second channel.

[0011] In some embodiments of the present application, the second channel has a first side and a second side along the conveying direction of the film material, the first side is located in front of the second side, the cutting knife is close to the first side of the second channel, and the film folding piece is close to the second side of the second channel.

[0012] In some embodiments of the present application, the cross section of the first channel close to the film loading mechanism is greater than the cross section away from the film loading mechanism, and the cross section is perpendicular to the conveying direction of the film material.

[0013] In some embodiments of the present application, the cutting mechanism further comprises a seat body and a driving piece, the first end of the seat body is connected with the output end of the driving piece, the second end of the seat body is connected with the cutting knife, and the driving piece is used to drive the cutting knife to move to cut the film material.

[0014] In some embodiments of the present application, the cutting mechanism further comprises a jackscrew, the seat body is provided with a first boss and a second boss, a gap exists between the first boss and the second boss, the second boss is provided with a jackscrew hole matched with the jackscrew, and the jackscrew passes through the jackscrew hole to press the cutting knife on the side surface of the first boss close to the second boss. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the film pasting device in an embodiment of the present application.

[0016] Figure 2 FIG. 7 is another perspective view of the film attaching apparatus according to an embodiment of the present application.

[0017] Figure 3 FIG. 8 is a partial view of the film attaching apparatus according to an embodiment of the present application.

[0018] Figure 4 FIG. 9 is a partial exploded view of the film attaching apparatus according to an embodiment of the present application. Figure 3

[0019] Figure 5 FIG. 10 is a partial view of the film attaching apparatus according to an embodiment of the present application.

[0020] Figure 6 FIG. 11 is a partial exploded view of the film attaching apparatus according to an embodiment of the present application.

[0021] Figure 7 FIG. 12 is another partial view of the film attaching apparatus according to an embodiment of the present application.

[0022] Main element symbol explanation

[0023] 100 - film attaching apparatus; 11 - film loading mechanism; 12 - film guiding mechanism; 121 - first channel; 122 - second channel; 123 - guiding plate; 1231 - accommodating cavity; 12311 - through hole; 12312 - real hole cavity; 124 - film sucking device; 1241 - sucking plate; 12411 - vacuum hole; 12412 - mounting groove; 13 - transfer mechanism; 131 - moving assembly; 1311 - first moving assembly; 1312 - second moving assembly; 132 - rotating assembly; 133 - pressing mechanism; 14 - cutting mechanism; 141 - cutting knife; 142 - seat body; 1421 - first boss; 1422 - second boss; 14221 - jackscrew hole; 143 - driving member; 144 - jackscrew; 15 - film folding mechanism; 151 - film folding member; 152 - rotating driving member; 153 - rotating member; 16 - roller assembly.

[0024] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0027] ​At present, when a workpiece is processed, a film needs to be pasted to protect the appearance surface of the workpiece, and the film is torn off after the workpiece is processed. However, after the existing film pasting equipment pastes the film on the workpiece, the end of the rear film is attached to the surface of the workpiece, and when tearing the film, a tool or a nail is needed to lift the film, and then the film is torn, which is low in film tearing efficiency. At the same time, when the tool or the nail is used to lift the film, the workpiece may be scratched, and the film tearing is prone to produce residual glue, resulting in low yield of the workpiece after the film is torn.

[0028] Therefore, in order to solve the above technical problems, the embodiments of the present application provide a film pasting device, comprising a film loading mechanism, a film guiding mechanism, a transfer mechanism, a cutting mechanism and a film folding mechanism. The film loading mechanism is used to load a strip-shaped rolled film material. The film guiding mechanism is arranged on one side of the film loading mechanism. The film guiding mechanism is provided with intersecting first and second grooves. The first groove is used to position the film material. The transfer mechanism is arranged on one side of the film guiding mechanism corresponding to the first groove. The transfer mechanism is used to drive the workpiece to move and move relative to the first groove to paste the film. The cutting mechanism is arranged on one side of the film guiding mechanism corresponding to one end of the second groove. The cutting mechanism comprises a cutting knife used to extend into the second groove to cut the film material. The film folding mechanism is arranged on the other side of the film guiding mechanism corresponding to the other end of the second groove. The film folding mechanism comprises a film folding piece extending into the second groove. The film folding piece is used to turn out of the second groove to drive one end of the cut film material to be folded.

[0029] After the film pasting device cuts off the film material after the workpiece is pasted with the film, the film folding piece of the film folding mechanism extends into the second groove and turns out of the second groove to drive one end of the cut film material to be folded, forming a handle, which is convenient for tearing the film at the handle directly in the subsequent process without the aid of auxiliary tools, thereby improving the film tearing efficiency.

[0030] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] Please refer to Figure 1 and Figure 2An embodiment of the present application provides a film pasting device 100. The film pasting device 100 comprises a film loading mechanism 11, a film guiding mechanism 12, a workpiece moving mechanism 13, a film cutting mechanism 14 and a film folding mechanism 15. The film loading mechanism 11 is used for loading a roll-shaped film material. The film guiding mechanism 12 is arranged on one side of the film loading mechanism 11. The film guiding mechanism 12 is provided with a first groove 121 and a second groove 122 intersecting with each other. The first groove 121 is used for positioning the film material. The workpiece moving mechanism 13 is arranged on one side of the film guiding mechanism 12 and corresponds to the first groove 121. The workpiece moving mechanism 13 is used for moving a workpiece and moving relative to the first groove 121 to paste the film. The film cutting mechanism 14 is arranged on one side of the film guiding mechanism 12 and corresponds to one end of the second groove 122. The film cutting mechanism 14 comprises a cutter 141 used for extending into the second groove 122 to cut the film material. The film folding mechanism 15 is arranged on the other side of the film guiding mechanism 12 and corresponds to the other end of the second groove 122. The film folding mechanism 15 comprises a film folding member 151 extending into the second groove 122. The film folding member 151 is used for turning out of the second groove 122 to fold one end of the cut film material.

[0032] In some embodiments of the present application, when the film pasting device pastes the film, the workpiece moving mechanism 13 moves the workpiece to make the outer surface of the workpiece paste the film material in the first groove and move relative to the first groove to complete the film pasting. The film pasting process does not need manual participation, and the film pasting efficiency is improved. Further, after the film cutting mechanism 14 cuts the film material, the film folding member 151 of the film folding mechanism 15 extends into the second groove 122 and turns out of the second groove 122 to fold one end of the cut film material, thereby forming a handle. The film can be directly torn at the handle in the subsequent process without the aid of auxiliary tools, and the film tearing efficiency is improved.

[0033] Referring to FIGS. 1 to 4, Figure 3 and Figure 4 In some embodiments of the present application, the film guiding mechanism 12 comprises a guide plate 123 and at least two film suction devices 124. The guide plate 123 is provided with the second groove 122. The second groove 122 has a first side and a second side relative to the conveying direction of the film material. The first side is located in front of the second side. The cutter 141 is close to the first side of the second groove 122. The film folding member 151 is close to the second side of the second groove 122.

[0034] In some embodiments of the present application, by cutting the cutting knife 141 close to the first side of the second channel 122, and folding the film folding member 151 close to the second side of the second channel 122, it is ensured that the film folding member 151 can be attached to one end of the cut film when it is turned over, avoiding the problem that the film folding member 151 cannot be turned over or the turning effect is not good due to the too short one end of the cut film, and ensuring the bending yield.

[0035] In some embodiments of the present application, the cross section of the first channel 121 close to the film loading mechanism 11 is larger than the cross section away from the film loading mechanism 11. The cross section is perpendicular to the conveying direction of the film.

[0036] In some embodiments of the present application, in the direction perpendicular to the conveying direction of the film, by gradually reducing the cross section of the first channel 121, it is beneficial for the film guide mechanism 12 to better convey the film, thereby improving the film pasting and folding efficiency of the film pasting device 100.

[0037] In some embodiments of the present application, at least two film suction devices 124 are arranged on the guide plate 123 and arranged in sequence on both sides of the second channel 122 along the conveying direction of the film to suck the film. By arranging the film suction device 124 on both sides of the second channel 122, it is ensured that both ends of the cut film are still sucked on the first channel 121, avoiding the problem that one end of the cut film falls off when the film folding mechanism 15 folds the film, and it is beneficial for the film folding mechanism 15 to better fold the film.

[0038] In some embodiments of the present application, each film suction device 124 includes a suction plate 1241. The suction plate 1241 is provided with a plurality of vacuum holes 12411, and the plurality of vacuum holes 12411 are in communication with the first channel 121. The guide plate 123 is also provided with a receiving cavity 1231 for accommodating each film suction device 124. The bottom of the receiving cavity 1231 is provided with a through hole 12311 and a vacuum cavity 12312. The through hole 12311 is used to communicate with an external air source. The vacuum cavity is in communication with the through hole 12311 and the plurality of vacuum holes 12411, forming a vacuum channel.

[0039] In some embodiments of the present application, by using the vacuum film suction device 124 to suck the film, direct contact with the surface of the film can be avoided, damage to the surface of the film is reduced, and the film pasting effect is ensured.

[0040] In some embodiments of the present application, the suction plate 1241 is provided with a mounting groove 12412, and the bottom surface of the mounting groove 12412 is flush with the surface of the first channel 121. On the one hand, it is beneficial for better conveying the film, and on the other hand, it avoids the problem that the surface of the film is damaged during the conveying process due to the uneven surface, thereby ensuring the subsequent film pasting effect.

[0041] In some embodiments of the present application, the installation groove 12412 is provided with a first positioning surface and a second positioning surface in a direction perpendicular to the conveying direction of the film material. The first positioning surface and the second positioning surface are used to position the film material, prevent the position of the film material from deviating during the film pasting process, and ensure the film pasting effect.

[0042] Referring to Figure 5 As shown, the X direction represents the first direction, and the Y direction represents the second direction. In some embodiments of the present application, the transfer mechanism 13 includes a moving assembly 131 and a rotating assembly 132. The rotating assembly 132 is arranged on the moving assembly 131. The moving assembly 131 is used to drive the rotating assembly 132 to move, and the rotating assembly 132 rotates to drive the workpiece to rotate and move relative to the first channel 121 to perform film pasting.

[0043] In some embodiments of the present application, the workpiece is arranged on the rotating assembly 132. The moving assembly 131 and the rotating assembly 132 move relative to each other to drive the workpiece to rotate and move relative to the first channel 121 to perform film pasting, without the need for manual participation, thereby improving the film pasting efficiency.

[0044] In some embodiments of the present application, the moving assembly 131 includes a first moving assembly 1311 and a second moving assembly 1312. The second moving assembly 1312 is arranged on the first moving assembly 1311. The first moving assembly 1311 is used to drive the second moving assembly 1312 to move in the first direction. The second moving assembly 1312 is used to move relative to the first moving assembly 1311 in the second direction. The first direction X is perpendicular to the second direction Y and located in the same horizontal plane.

[0045] In some embodiments of the present application, the rotating assembly 132 carries the workpiece, and the rotating assembly 132 is arranged on the second moving assembly 1312. The first moving assembly 1311 and the second moving assembly 1312 cooperate to drive the rotating assembly 132 to carry the workpiece to move in the first direction and the second direction, which can realize accurate positioning of the workpiece, so that the outer surface of the workpiece can be pasted / wrapped with the film material in the first channel 121, thereby improving the film pasting accuracy of the film pasting device 100, and being conducive to subsequent film folding by the film folding mechanism 15.

[0046] In some embodiments of the present application, the transfer mechanism 13 further includes a pressing mechanism 133. The pressing mechanism 133 is arranged on the second moving assembly 1312. The pressing mechanism 133 is used to press the workpiece to ensure the stability of the position of the workpiece, thereby improving the efficiency of subsequent film pasting and film folding.

[0047] Referring to Figure 6As shown, in some embodiments of the present application, the cutting mechanism 14 further comprises a seat body 142 and a driving member 143. A first end of the seat body 142 is connected to an output end of the driving member 143. A second end of the seat body 142 is connected to the cutting knife 141. The driving member 143 is configured to drive the cutting knife 141 to move, so as to cut the film material. For example, the driving member 143 can be a pneumatic cylinder.

[0048] In some embodiments of the present application, the cutting edge of the cutting knife 141 can be perpendicular to the conveying direction of the film material. The driving member 143 is configured to drive the cutting knife 141 to cut the film material in the second channel 122 perpendicularly, so as to ensure that a neat cutting edge is achieved, which is beneficial for subsequent film tearing, and thus improves the film tearing efficiency.

[0049] In some embodiments of the present application, the cutting mechanism 14 further comprises a jackscrew 144. The seat body 142 is provided with a first boss 1421 and a second boss 1422. A gap is formed between the first boss 1421 and the second boss 1422. The second boss 1422 is provided with a jackscrew hole 14221 which is adapted to the jackscrew 144. The jackscrew 144 is configured to press the cutting knife 141 against the side of the first boss 1421 which is close to the second boss 1422 through the jackscrew hole 14221.

[0050] In some embodiments of the present application, the jackscrew 144 is configured to fix the cutting knife 141, which is beneficial for disassembly, replacement and maintenance of the cutting knife 141.

[0051] Referring to Figure 7 As shown, in some embodiments of the present application, the film folding mechanism 15 comprises a film folding member 151. The width of the film folding member 151 is less than the width of the second channel 122.

[0052] In some embodiments of the present application, the width of the film folding member 151 along the conveying direction of the film material is less than the width of the second channel 122 along the conveying direction of the film material, which is beneficial for the movement of the film folding member 151 in the second channel 122, so as to achieve better film folding.

[0053] In some embodiments of the present application, in order to realize the variable length of the bent handle, the width of the second channel 122 along the conveying direction of the film material and the width of the film folding member 151 along the conveying direction of the film material can be adjusted according to the length of the bent handle, for example, if the film folding handle is bent by 5 mm, the width of the film folding member 151 is set to 5 mm, and the width of the second channel 122 is set to 7 mm. If the film folding handle is bent by 8 mm, the width of the film folding member 151 is set to 8 mm, and the width of the second channel 122 is set to 10 mm. If the film folding handle is bent by 10 mm, the width of the film folding member 151 is set to 10 mm, and the width of the second channel 122 is set to 12 mm. By adjusting the width of the film folding member 151 and the second channel 122 according to the length of the bent handle, on the one hand, the film folding effect can be ensured, and on the other hand, the film folding length can be accurately controlled, the problem of film folding failure or unqualified film folding caused by improper film folding length can be reduced, and the film folding efficiency is improved.

[0054] In some embodiments of the present application, the film material moves in the first channel 121, and the cutting position of the film material is at the intersection of the first channel 121 and the second channel 122. By arranging the second channel 122 perpendicular to the first channel 121, the cutting mechanism 14 can cut the film material vertically, and by vertical cutting, the cutting edge can be neat, which is beneficial to subsequent film tearing, thereby improving the film tearing efficiency.

[0055] In some embodiments of the present application, the film folding mechanism 15 further comprises a rotary driving member 152 and a rotary member 153. One end of the driving member 143 is connected with one end of the rotary member 153. The other end of the rotary member 153 is connected with the film folding member 151, and the film folding member 151 is eccentrically arranged on the rotary member 153. The rotary driving member 152 is used to drive the rotary member 153 to drive the film folding member 151 to turn out of the second channel 122, and to drive one end of the cut film material to be folded.

[0056] In some embodiments of the present application, by eccentrically arranging the film folding member 151 on the rotary member 153, on the one hand, the film folding member 151 can ensure the generation of bubbles and wrinkles during the film folding process, and on the other hand, the film folding position can be adjusted to adapt to different specifications of workpieces on the same device, thereby improving the flexibility and adaptability of the film pasting device 100.

[0057] In some embodiments of the present application, the film pasting device 100 further comprises a roller assembly 16. The roller assembly 16 is arranged on the side away from the film loading mechanism 11 and corresponds to the first channel 121. The roller assembly 16 is used to abut against the workpiece and roll the film material on the workpiece.

[0058] In some embodiments of the present application, when the film pasting device 100 is pasting the film, the roller assembly 16 is in abutment with the workpiece, the film material is placed between the roller assembly 16 and the workpiece, and uniform pressure can be applied to the entire contact surface by rolling the roller assembly 16. The film material can also be tightly attached to the surface of the workpiece by the pressure of the roller assembly 16, improving the adhesion between the two, reducing air bubbles and voids, improving the film pasting effect, and on the other hand, the roller assembly 16 can smooth the surface of the film material, making it smoother, avoiding scratches and damage caused by the film pasting process, and improving the appearance quality of the workpiece.

[0059] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application is described with reference to the embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and essence of the technical solutions of the present application.

Claims

1. A film pasting apparatus, characterized by comprising: The film pasting device comprises: a film loading mechanism for loading a strip-shaped rolled film material; a film guiding mechanism arranged on one side of the film loading mechanism, the film guiding mechanism being provided with intersecting first and second grooves, the first groove being used for positioning the film material; a film moving mechanism arranged on one side of the film guiding mechanism corresponding to the first groove, the film moving mechanism being used for moving the workpiece and moving relative to the first groove to perform film pasting; a film cutting mechanism arranged on one side of the film guiding mechanism corresponding to one end of the second groove, the film cutting mechanism comprising a cutting knife used for extending into the second groove to cut the film material; a film folding mechanism arranged on the other side of the film guiding mechanism corresponding to the other end of the second groove, the film folding mechanism comprising a film folding member extending into the second groove, the film folding member being used for turning out of the second groove to fold one end of the cut film material.

2. The film pasting apparatus according to claim 1, wherein The film guiding mechanism comprises a guide plate provided with the second groove and at least two film suction devices arranged on the guide plate and sequentially arranged on both sides of the second groove along the conveying direction of the film material to suck the film material.

3. The film pasting apparatus according to claim 1, wherein The film moving mechanism comprises a moving assembly and a rotating assembly arranged on the moving assembly, the moving assembly being used for moving the rotating assembly, the rotating assembly rotating to rotate the workpiece and move relative to the first groove to perform film pasting.

4. The film pasting apparatus according to claim 3, wherein The moving assembly comprises a first moving assembly and a second moving assembly arranged on the first moving assembly; the first moving assembly is used for moving the second moving assembly in a first direction; the second moving assembly is used for moving relative to the first moving assembly in a second direction, the first direction being perpendicular to the second direction and located in the same horizontal plane.

5. The film pasting apparatus according to claim 1, wherein The film pasting device further comprises a roller assembly arranged on one side away from the film loading mechanism corresponding to the first groove, the roller assembly being used for abutting against the workpiece to roll the film material on the workpiece. 6.The film pasting apparatus according to claim 1, characterized in that, The width of the film folding member is smaller than the width of the second groove. 7.The film pasting apparatus according to claim 1, characterized in that, The second groove has a first side and a second side along the conveying direction of the film material, the first side being located in front of the second side, the cutting knife being close to the first side of the second groove, and the film folding member being close to the second side of the second groove. 8.The film pasting apparatus according to claim 1, wherein The cross section of the first groove close to the film loading mechanism is larger than the cross section of the first groove away from the film loading mechanism, the cross section being perpendicular to the conveying direction of the film material.

9. The film pasting apparatus according to claim 1, wherein The film cutting mechanism further comprises a seat and a driving member, a first end of the seat being connected with an output end of the driving member, a second end of the seat being connected with the cutting knife, and the driving member being used for driving the cutting knife to move to cut the film material. 10.The film pasting apparatus according to claim 9, characterized in that, The film cutting mechanism further comprises a jackscrew, the seat being provided with a first boss and a second boss, a gap being present between the first boss and the second boss, the second boss being provided with a jackscrew hole matched with the jackscrew, and the jackscrew penetrating through the jackscrew hole to press the cutting knife against the side surface of the first boss close to the second boss.

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