Knife net unwinding, grinding and winding all-in-one machine

Abstract

The utility model relates to an unwinding, grinding and winding all-in-one machine for a knife net. The unwinding, grinding and winding all-in-one machine comprises an unwinding unit, a grinding unit, a winding unit and two elastic compression roller units. On one hand, clamping and forward pushing force is provided based on the elastic compression roller unit to move the knife net forwards, unwinding and winding are carried out under constant tension, pulling or loose extrusion is avoided, and the knife net is not affected by grinding; and on the other hand, unpowered grinding is adopted, that is, in the pushing and pulling process of the two elastic pressing roller units, the grinding wheel and the auxiliary roller are attached up and down to move oppositely, the knife net face is ground, the probability of over-grinding or miss-grinding is small, the deformation rate is reduced, and meanwhile the NG rate of the knife net and the knife head assembly product caused by winding is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of knife net processing, and particularly relates to a knife net unwinding, grinding and winding integrated machine. BACKGROUND

[0002] The knife net is a protective net for a cutter, for example, in a shaving product, the skin is contacted by the knife net, and the hair is introduced into the knife net, and then the hair is cut off by the movement of the cutter, therefore, the smoothness of the back surface of the knife net must reach the required accuracy, otherwise, the skin will be scratched by the knife net, or the cutter will be dull, and the thickness of the knife net is about 1mm, so that the general polishing process comprises three processes of unwinding, polishing and winding, however, the stress applied to the knife net by polishing is unstable, so that the tension of the wound knife net cannot be kept the same, therefore, the formed winding will increase the deformation rate of the knife net, and the unwinding will also be pulled, so that the unwinding is unstable, in other words, the grinding will be insufficient or be pulled off or broken due to the pulling, and the winding tension will be changed due to the instantaneous forward pushing, so that the stable operation of the subsequent process is directly affected, and the NG rate of the product caused by the knife net is increased. SUMMARY

[0003] The utility model wants to solve the technical problem that the prior art is overcome, and provide an improved knife net unwinding, grinding and winding integrated machine.

[0004] To solve the above technical problems, the utility model takes the following technical scheme:

[0005] A knife net unwinding, grinding and winding integrated machine, which comprises an unwinding unit, a polishing unit and a winding unit, wherein the unwinding unit comprises an unwinding disc and an unwinder, the polishing unit comprises a grinding wheel, the winding unit comprises a winding disc and a winding device, the polishing unit further comprises an auxiliary roller for lifting the knife net upward, wherein the grinding wheel is located directly above the auxiliary roller, and the grinding wheel is a non-powered wheel, and the auxiliary roller is a non-powered roller, the non-powered wheel and the non-powered roller move towards each other to push the ground knife net forward, the knife net unwinding, grinding and winding integrated machine further comprises two elastic pressure roller units arranged between the unwinding disc and the grinding wheel and between the winding disc and the grinding wheel, respectively, wherein the elastic pressure roller units provide clamping and forward pushing force to move the knife net forward so that the unwinding and winding of the knife net are carried out under constant tension.

[0006] Preferably, the two elastic pressure roller units are identical in structure and each comprises a roller seat, a front leading-in roller and a rear leading-in roller, a transmission roller between the front leading-in roller and the rear leading-in roller, and a follow-up pressure roller for maintaining the elastic pressure downward and pressing on the transmission roller, wherein the roller top surfaces of the front leading-in roller and the rear leading-in roller, the roller top surface of the transmission roller, and the roller bottom surface of the follow-up pressure roller form a horizontally extending roller pressing channel, and the unwound knife net is guided upward by the front leading-in roller to the space between the auxiliary roller and the grinding wheel after passing through the roller pressing channel, and the ground knife net is guided upward by the front leading-in roller to the winding disc after passing through the roller pressing channel.

[0007] According to a specific implementation and preferred aspect of the utility model, the transmission rollers of each elastic pressure roller unit are in parallel and multiple, and the follow-up pressure rollers correspond to the transmission rollers one by one, and the knife net unwinding, grinding and winding all-in-one machine further comprises a power device, the power device drives the rotation of the multiple or any one of the transmission rollers, and the corresponding follow-up pressure roller rotates in the opposite direction to push the knife net forward.

[0008] Preferably, guide rails extending upward and downward are arranged on the roller seats at both ends of each roller, and each elastic pressure roller unit further comprises a pressing assembly, wherein the pressing assembly comprises an upper seat and a lower seat slidingly installed on the guide rails, an elastic member between the upper seat and the lower seat, and a locking bolt abutting against the upper seat, wherein the elastic member provides the elastic pressure downward under the abutment of the locking bolt, and the follow-up pressure roller is installed between the two lower seats from the shaft end.

[0009] In some specific implementations, the transmission rollers are two, the guide rails correspond to two groups, the pressing assemblies correspond to two groups, and the follow-up pressure rollers correspond to two and are arranged directly above the transmission rollers based on each pressing assembly.

[0010] Preferably, the roller top surfaces of the two transmission rollers, the roller bottom surface of the front leading-in roller, and the roller bottom surface of the rear leading-in roller are flush; and the bottom surfaces of the two follow-up pressure rollers are flush and arranged above the moving knife net.

[0011] In some specific implementations, the power device is a driving motor, the two transmission rollers are in transmission connection with the driving motor from the end, and the two transmission rollers rotate in the same direction. Based on the same direction transmission, the knife net is more conducive to being kept in a horizontal state and pushed forward. Specifically, a power gear is installed at the shaft end of the driving motor, two transmission gears corresponding to the same power gear are installed at the shaft ends of the two transmission rollers, and the two transmission gears rotate in the same direction to keep the knife net clamped and horizontally moved forward.

[0012] According to one specific implementation and preferred aspect of the present application, the two ends of the front and rear leading rollers are formed with roller sleeves, and the roller surface between the two roller sleeves constitutes a roller conveying surface. The roller sleeves limit the width direction to keep the same position for winding, and improve the neatness of winding.

[0013] In addition, the front and rear leading rollers are free rotating rollers. The free rotation converts the sliding friction into rolling friction, which is more beneficial to the forward pushing of the knife net. Meanwhile, the front and rear leading rollers press the knife net downward from the bottom. The downward pressing tension keeps the horizontal transmission of the knife net to improve the stability of the winding tension.

[0014] Preferably, the roller bottom surface of the front and rear leading rollers is flush with the roller top surface of the conveying roller to keep the horizontal transmission of the knife net.

[0015] Compared with the prior art, the present application has the following advantages due to the implementation of the above technical scheme:

[0016] In the existing knife net grinding process, the stress applied to the knife net by grinding is unstable, so that the tension of the wound knife net cannot be kept the same. Therefore, the formed winding increases the deformation rate of the knife net, and the unwinding is also subjected to pulling, causing unstable unwinding. In other words, the insufficient grinding or tearing and breaking caused by pulling, the uneven winding tension caused by instantaneous forward pushing, the direct impact on the stable progress of the subsequent process, the increase of the NG rate of the product caused by the knife net, and other disadvantages are avoided. The structure of the knife net unwinding, grinding and winding all-in-one machine is designed as a whole, and the disadvantages and defects of the prior art are ingeniously solved. After using the all-in-one machine, the unwound knife net enters the elastic pressure roller unit, and the elastic pressure roller unit provides clamping and forward pushing force to move the knife net forward. Then, the knife net is transmitted upward between the grinding wheel and the auxiliary roller, and the surface of the knife net is ground by the forward winding and rearward pushing. Then, the elastic pressure roller unit provides clamping and forward pushing force to move the knife net forward. Finally, the knife net is wound by the winding disc at the front end. Therefore, the present application moves the knife net forward based on the clamping and forward pushing force provided by the elastic pressure roller unit, keeps the unwinding and winding under constant tension, avoids pulling or loose extrusion, and is not affected by grinding. On the other hand, the all-in-one machine adopts non-powered grinding, that is, in the process of pushing and pulling by the two elastic pressure roller units, the grinding wheel and the auxiliary roller are upwardly and downwardly attached to each other and move towards each other to grind the surface of the knife net. The probability of over-grinding or missed grinding is small, the deformation rate is reduced, and the NG rate of the knife net and the knife head assembly product caused by winding is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described in detail below with reference to the drawings and specific embodiments.

[0018] Figure 1 The structure of the knife net unwinding, grinding and winding all-in-one machine of the present application is shown in the figure.

[0019] Figure 2 is a front view schematic diagram of the device; Figure 1

[0020] Figure 3 is a top view schematic diagram of the device; Figure 2

[0021] Figure 4 is a A-A sectional view schematic diagram of the device; Figure 3

[0022] Figure 5 is a schematic diagram of the winding unit and the elastic pressure roller unit of the device; Figure 3

[0023] Figure 6 is a B-B sectional view schematic diagram of the device; Figure 5

[0024] Figure 7 is a schematic diagram of the unwinding unit and the elastic pressure roller unit of the device; Figure 3

[0025] Figure 8 is a C-C sectional view schematic diagram of the device; Figure 7

[0026] wherein: 1, unwinding unit; 10, unwinding disc; 11, unwinder;

[0027] 2, polishing unit; 20, grinding wheel; 21, auxiliary roller;

[0028] 3, winding unit; 30, winding disc; 31, winder;

[0029] 4, elastic pressure roller unit; 40, roller seat; 41, front leading roller; 42, rear leading roller; 43, transmission roller; 44, follow-up pressure roller; 45, guide rail; 46, lower pressing assembly; 460, upper seat; 461, lower seat; 462, elastic member; 463, locking bolt;

[0030] 5, power device; 6, power gear; 7, transmission gear; 8, roller sleeve;

[0031] M, cutter net. DETAILED DESCRIPTION

[0032] In order to make the above objectives, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.​​​​​​​

[0033] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, the terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0037] like Figures 1 to 8 As shown, the knife net unwinding, grinding and winding all-in-one machine of this embodiment includes an unwinding unit 1, a grinding unit 2 and a winding unit 3, wherein the unwinding unit 1 includes an unwinding disc 10 and an unwinder 11, the grinding unit 2 includes a grinding wheel 20 and an auxiliary roller 21 for lifting the knife net M upward, and the winding unit 3 includes a winding disc 30 and a winder 31.

[0038] Specifically, the unwinding unit 1 and the winding unit 3 are symmetrically arranged about the center of the grinding wheel 20 .

[0039] In this example, the grinding wheel 20 is located directly above the auxiliary roller 21, and the grinding wheel 20 is an unpowered wheel, and the auxiliary rollers 21 are all unpowered rollers. The unpowered wheel and the unpowered roller move toward each other to push the ground knife net M forward.

[0040] The knife net unwinding, grinding and winding machine also includes two elastic pressure roller units 4 respectively arranged between the unwinding disk 10 and the grinding wheel 20, and between the winding disk 30 and the grinding wheel 20, wherein the elastic pressure roller unit 4 provides clamping and forward driving force to move the knife net M forward so that the knife net M can be unwound and wound under constant tension.

[0041] In some specific embodiments, the two elastic pressure roller units 4 have the same structure. By taking one as an example, the other will also be clear. In this example, each elastic pressure roller unit 4 includes a roller seat 40, a front guide roller 41 and a rear guide roller 42, a transfer roller 43 positioned between the front guide roller 41 and the rear guide roller 42, and a follower pressure roller 44 that maintains downward elastic pressure and presses against the transfer roller 43. The conveying surfaces of the front and rear guide rollers 41 and 42, the top of the transfer roller 43, and the bottom of the follower pressure roller 44 form a horizontally extending pressing channel. After the unwound blade net M passes horizontally through the pressing channel, the front guide roller 41 guides the blade net M upward to between the auxiliary roller 21 and the grinding wheel 20. After the ground blade net M passes horizontally through the pressing channel, the front guide roller 41 guides the blade net M upward to the winding reel 30.

[0042] Each elastic pressure roller unit 4 has multiple transmission rollers 43 arranged side by side, and the follower pressure rollers 44 correspond one to one with the transmission rollers 43. The knife net unwinding, grinding, and winding machine also includes a power unit 5, which drives multiple or any one transmission roller to rotate, and the corresponding follower pressure rollers rotate in opposite directions to push the knife net forward. The roller seats 40 at both ends of each roller are respectively provided with guide rails 45 extending up and down. Furthermore, each elastic pressure roller unit 4 also includes a downward pressure assembly 46, wherein the downward pressure assembly 46 includes an upper seat 460 and a lower seat 461 slidably mounted on the guide rails 45, an elastic member 462 located between the upper seat 460 and the lower seat 461, and a locking bolt 463 that maintains contact with the upper seat 460. Under the contact of the locking bolt 463, the elastic member 462 remains compressed to provide downward elastic pressure. The follower pressure roller 44 is installed between the two lower seats 461 from the shaft end. The downward pressure is adjusted based on the resistance provided by the locking bolts, ensuring optimal tension is maintained to push the blade net forward. In this example, there are two transport rollers 43, two corresponding sets of guide rails 45, two corresponding sets of downward pressure assemblies 46, and two corresponding follower pressure rollers 44, each of which is pressed directly above the transport rollers 43. The top surfaces of the two transport rollers 43, the bottom surfaces of the front guide roller 41, and the bottom surfaces of the rear guide roller 42 are flush; the bottom surfaces of the two follower pressure rollers 44 are flush and pressed above the moving blade net M.

[0043] The power unit 5 is a drive motor. Two transmission rollers 43 are connected to the drive motor from their ends, and both transmission rollers 43 rotate in the same direction. This same-direction transmission facilitates the forward movement of the blade net while maintaining a horizontal position. Specifically, a power gear 6 is mounted on the shaft end of the drive motor. Two transmission gears 7 mesh with the same power gear 6 at the shaft ends of the two transmission rollers 43. These two transmission gears 7 rotate in the same direction, pushing the blade net M forward, maintaining a horizontal position.

[0044] In addition, the front and rear pinch rollers 41 and 42 are free-rotating rollers. By free-rotation, sliding friction is converted into rolling friction, which is more conducive to the forward pushing of the knife net. At the same time, the front and rear pinch rollers 41 and 42 press the knife net M from the bottom. The downward pressure tension formed keeps the knife net horizontal transmission, so as to improve the stability of the winding tension. The bottom surfaces of the front and rear pinch rollers 41 and 42 are flush with the top surface of the transmission roller 43, so as to keep the knife net horizontal transmission. The two ends of the front and rear pinch rollers 41 and 42 are formed with roller sleeves 8, and the roller surfaces between the two roller sleeves 8 constitute the roller transmission surface. Based on the roller sleeves, the width direction is limited, so as to keep the winding in the same position and improve the neatness of the winding.

[0045] As for the winding and unwinding, the winding disc 30 is composed of a conventional reel and a disc, wherein the reel is kept parallel to the rollers; the winder 31 is a conventional motor and is installed on the roller seat 40. Similarly, the unwinding disc 10 is composed of a conventional reel and a disc, wherein the reel is kept parallel to the rollers; the unwinder 11 is a conventional motor and is installed on the roller seat 40.

[0046] In summary, the implementation process of the embodiment is as follows:

[0047] The unwound knife net M enters the elastic compression roller unit 4 and is moved forward by the clamping and forward pushing force provided by the elastic compression roller unit 4, then is transmitted upward between the grinding wheel 20 and the auxiliary roller 21, and the surface of the knife net M is ground by the front end winding and rear end pushing, then the knife net is moved forward by the clamping and forward pushing force provided by the elastic compression roller unit 4, and finally is wound by the front end winding disc.

[0048] Specifically, the knife net M is pressed downward and pushed forward by the rear pinch roller 42, and is pushed forward in a horizontal and tensioned state by the transmission rollers 43 and the floating and elastic follow-up compression rollers 44 rotating towards each other, and the two groups of transmission rollers 43 and follow-up compression rollers 44 move forward in the same direction to clamp and push forward.

[0049] Therefore, after adopting the all-in-one machine, the knife net of the unwinding enters the elastic compression roller unit, and the elastic compression roller unit provides clamping and forward pushing force to move the knife net forward, then transmits upward between the grinding wheel and the auxiliary roller, and the front end winding and the rear end pushing implement grinding of the knife net surface, then the elastic compression roller unit provides clamping and forward pushing force to move the knife net forward, and finally the front end winding disc implements winding, therefore, the utility model on the one hand provides clamping and forward pushing force to move the knife net forward based on the elastic compression roller unit, keeps unwinding and winding under constant tension, avoids pulling or loose extrusion, and is not affected by grinding; on the other hand, no power grinding is adopted, that is, in the process of pushing and pulling of the two elastic compression roller units, the grinding wheel and the auxiliary roller are upwardly adhered and move towards each other to implement grinding of the knife net surface, the probability of over-grinding or missing grinding is small, the deformation rate is reduced, and the NG rate of the knife net and the knife head assembly product caused by winding is also reduced; thirdly, the unwound knife net horizontally passes through the roller compression channel and is guided upward by the front connecting roller to between the auxiliary roller and the grinding wheel; the ground knife net horizontally passes through the roller compression channel and is guided upward by the front connecting roller to the winding disc; fourthly, under the resistance of the locking bolt, the elastic member provides downward elastic pressure under compression, the follow-up compression roller is installed between the two lower seats from the shaft end, that is, the resistance force provided by the locking bolt is changed to adjust the size of the downward pressure, so that the knife net is pushed forward under the most suitable tension; fifthly, the two transmission rollers are transmissionally connected with the driving motor from the end, and the two transmission rollers rotate in the same direction, which is beneficial to keeping the knife net in a horizontal state and pushing forward based on the same direction transmission; sixthly, the roller sleeve forms a width direction limitation to keep winding at the same position and improve the neatness of winding.

[0050] The utility model has been described in detail above, the purpose lies in enabling the person who is familiar with this field technology to understand the content of the utility model and implement, and cannot limit the protection scope of the utility model with this, all equivalent changes or modifications according to the spirit of the utility model should be covered in the protection scope of the utility model.

Claims

1. A knife net unwinding, grinding, and winding machine, comprising an unwinding unit, a grinding unit, and a winding unit, wherein the unwinding unit comprises an unwinding disc and an unwinder, the grinding unit comprises a grinding wheel, and the winding unit comprises a winding disc and a winder, characterized in that: The grinding unit further includes an auxiliary roller for lifting the knife net upward, wherein the grinding wheel is located directly above the auxiliary roller, and the grinding wheel is an unpowered wheel, and the auxiliary rollers are all unpowered rollers, and the unpowered wheel and the unpowered roller move toward each other to push the ground knife net forward; The knife net unwinding, grinding and winding machine also includes two elastic pressure roller units respectively arranged between the unwinding disk and the grinding wheel, and between the winding disk and the grinding wheel, wherein the elastic pressure roller units provide clamping and forward driving force to move the knife net forward so that the knife net can be unwound and wound under constant tension.

2. The knife net unwinding, grinding and winding all-in-one machine according to claim 1, characterized in that: The two elastic pressure roller units have the same structure and both include a roller seat, a front guide roller and a rear guide roller, a transmission roller located between the front guide roller and the rear guide roller, and a follower pressure roller that maintains downward elastic pressure and presses positively on the transmission roller, wherein the roller conveying surfaces of the front guide roller and the rear guide roller, the roller conveying surface formed on the top of the transmission roller, and the roller conveying surface formed on the bottom of the follower pressure roller form a horizontally extending rolling channel, and the unwound knife net is horizontally guided by the front guide roller to between the auxiliary roller and the grinding wheel after passing through the rolling channel; the ground knife net is horizontally guided by the front guide roller to the winding disk after passing through the rolling channel.

3. The knife net unwinding, grinding and winding all-in-one machine according to claim 2, characterized in that: Each of the elastic pressure roller units has multiple transmission rollers arranged side by side, and the follower pressure rollers correspond to the transmission rollers one by one. The knife net unwinding, grinding and winding machine also includes a power device, which drives multiple or any one of the transmission rollers to rotate, and the corresponding follower pressure rollers keep rotating in opposite directions to push the knife net forward.

4. The knife net unwinding, grinding and winding all-in-one machine according to claim 3, characterized in that: Guide rails extending up and down are respectively provided on the roller seats at both ends of each roller, and each elastic pressure roller unit also includes a downward pressure component, wherein the downward pressure component includes an upper seat and a lower seat slidably mounted on the guide rails, an elastic member located between the upper seat and the lower seat, and a locking bolt that maintains contact with the upper seat, wherein under the contact of the locking bolt, the elastic member remains compressed to provide downward elastic pressure, and the follower pressure roller is installed between the two lower seats from the shaft end.

5. The knife net unwinding, grinding and winding all-in-one machine according to claim 4, characterized in that: There are two transmission rollers, two corresponding guide rails, two corresponding pressing assemblies, and two corresponding follower pressing rollers, which are pressed directly above the transmission rollers based on the pressing assemblies.

6. The knife net unwinding, grinding and winding all-in-one machine according to claim 5, characterized in that: The top surfaces of the two transmission rollers, the bottom surfaces of the front guide rollers and the bottom surfaces of the rear guide rollers are flush with each other; the bottom surfaces of the two follower pressure rollers are flush with each other and are pressed above the movable knife net.

7. The knife net unwinding, grinding and winding all-in-one machine according to claim 3, characterized in that: The power device is a driving motor, and the two transmission rollers are connected to the driving motor from their ends, and the two transmission rollers rotate in the same direction.

8. The knife net unwinding, grinding and winding all-in-one machine according to claim 7, characterized in that: A power gear is installed at the shaft end of the driving motor, and two transmission gears meshing with the same power gear are installed at the shaft ends of the two transmission rollers, and the two transmission gears rotate in the same direction to push the knife net forward to keep it clamped and moved forward horizontally.

9. The knife net unwinding, grinding and winding all-in-one machine according to claim 2, characterized in that: Both ends of the front guide roller and the rear guide roller form roller sleeves, and the roller surface between the two roller sleeves constitutes a roller conveying surface.

10. The knife net unwinding, grinding and winding all-in-one machine according to claim 2, characterized in that: The front guide roller and the rear guide roller are both freely rotating rollers; and / or, the front guide roller and the rear guide roller both press the knife net downward from the bottom.

Images