Knife belt polishing device

Abstract

The utility model discloses a knife belt polishing device which comprises a bottom plate and an installation seat, the installation seat is arranged above the bottom plate, an installation assembly used for installing a sawtooth knife belt is arranged on the bottom plate, the installation seat is located in the installation assembly, a polishing assembly used for polishing the sawtooth knife belt is arranged above the installation seat, and a driving assembly is arranged on the installation seat. The driving assembly is in transmission connection with the grinding assembly, the driving assembly drives the grinding end of the grinding assembly to be close to or away from the cutting edge of the serrated knife belt, a moving assembly used for driving the serrated knife belt to move step by step is arranged on the mounting seat, a power assembly is arranged on the mounting seat, and the power assembly is in transmission connection with the grinding assembly, the driving assembly and the moving assembly. Through cooperation of the driving assembly, the polishing assembly and the moving assembly, different cutting edges of the serrated knife belt can be polished in the stepping movement process of the serrated knife belt, the device can fully automatically polish the cutting edges of the serrated knife belt, and workers do not need to manually polish the cutting edges of the serrated knife belt.

Description

Technical Field

[0001] The utility model relates to the technical field of wood cutting, in particular to a knife belt grinding device. Background Art

[0002] With the development of society and the continuous progress of mankind, various advanced equipment has been continuously developed, and people's quality of life has been greatly improved. Among them, furniture made of wood is deeply loved by people. In the process of furniture making, wood needs to be cut. In the process of wood cutting, the cutting of wood is often completed by the movement of the sawtooth knife belt;

[0003] After being used for a period of time, the serrated blade needs to be sharpened to ensure its sharpness. In the prior art, each edge is often polished by a manual handheld grinding device. Since there are many edges on the blade, the work intensity of the workers is high, and the sparks generated during manual grinding will also threaten the safety of the workers. Utility Model Content

[0004] (I) Purpose of the utility model

[0005] In order to solve the technical problems existing in the background technology, the utility model proposes a knife belt grinding device, which can realize the grinding of different cutting edges of the serrated knife belt during the stepping movement of the serrated knife belt through the cooperation of a driving component, a grinding component and a moving component. The device can grind the cutting edge of the serrated knife belt fully automatically without the need for manual grinding by the staff, thereby effectively reducing the work intensity of the staff and reducing the safety hazards of the staff.

[0006] (II) Technical solution

[0007] The utility model provides a knife belt grinding device, comprising a horizontally arranged base plate and a mounting seat, the mounting seat being arranged above the base plate, a mounting assembly for mounting a serrated knife belt being arranged on the base plate, the mounting seat being located in the mounting assembly, a grinding assembly for grinding the serrated knife belt being arranged above the mounting seat, a driving assembly being arranged on the mounting seat, the driving assembly being transmission-connected with the grinding assembly, the driving assembly driving the grinding end of the grinding assembly to approach or move away from the cutting edge of the serrated knife belt, a moving assembly for driving the serrated knife belt to move stepwise is arranged on the mounting seat, a power assembly is arranged on the mounting seat, and the power assembly is transmission-connected with the grinding assembly, the driving assembly and the moving assembly respectively.

[0008] Preferably, the mounting assembly includes a plurality of mounting blocks, and the plurality of mounting blocks are all arranged on the base plate, and the plurality of mounting blocks are arranged at intervals along the shape of the serrated knife band. A first notch for inserting the serrated knife band is provided at the upper end of the mounting block, and the interior of the first notch is slidably arranged in contact with the outer end of the serrated knife band.

[0009] Preferably, the power assembly includes an installation box, a horizontally arranged first rotating shaft, and a horizontally arranged second rotating shaft, the installation box is arranged at the upper end of the installation seat, one end of the first rotating shaft passes through the installation box and is rotatably connected thereto, the second rotating shaft is vertically arranged with the first rotating shaft and is located below the installation box, one end of the second rotating shaft passes through the installation box and is rotatably connected to the installation box, the first rotating shaft and the second rotating shaft are connected by a worm gear transmission, the first rotating shaft is transmission-connected to the grinding assembly, the second rotating shaft is transmission-connected to the driving assembly and the moving assembly, a motor is provided on the installation seat, a rotating shaft is fixedly connected to the output shaft of the motor, the rotating shaft is located below the first rotating shaft, and the rotating shaft is transmission-connected to the first rotating shaft.

[0010] Preferably, the grinding assembly includes a third rotating shaft, a connecting frame, a fixed seat and a grinding disc, the connecting frame is transmission-connected to the driving assembly, two fixed seats are arranged on the connecting frame at intervals, one end of the third rotating shaft passes through the two fixed seats and is respectively rotatably connected thereto, the other end of the third rotating shaft is coaxially connected to the grinding disc, the grinding disc is inclined and arranged parallel to the cutting edge of the serrated knife belt, a first pulley is coaxially arranged on the third rotating shaft, a second pulley is coaxially arranged on the first rotating shaft, a first through hole for the belt to pass through is provided on the connecting frame, and the first pulley and the second pulley are connected via the belt transmission.

[0011] Preferably, the driving assembly includes a mounting frame and a fixing plate, the mounting frame is located above the mounting seat and is connected to the mounting seat via the fixing plate, the mounting frame is provided with a slide groove at one end facing the connecting frame, the connecting frame is slidably arranged in the slide groove, the mounting frame is provided with a second through hole interconnected with the first through hole, the mounting frame is provided with a driving unit, the driving unit is transmission-connected with the connecting frame, the driving unit drives the connecting frame to reciprocate along the sliding direction of the slide groove, and the driving unit is transmission-connected with the second rotating shaft.

[0012] The transmission rod is located at one end of the mounting bracket away from the connecting bracket, and one end of the transmission rod is connected to the connecting bracket by the spring. The other end of the transmission rod is connected to the transmission plate, and the other end of the transmission plate is slidably mounted on the transmission bracket.

[0013] Preferably, the moving assembly includes a rotating disk, a transmission block and a shift rod, the rotating disk is coaxially connected to one end of the second rotating shaft, a connecting rod is provided at the end of the rotating disk away from the second rotating shaft, the connecting rod is vertically arranged to the rotating disk, one end of the transmission block is connected to the connecting rod, and the other end of the transmission block is connected to the shift rod, and the shift rod periodically abuts against the cutting edge of the serrated knife belt.

[0014] Compared with the prior art, the above technical solution of the utility model has the following beneficial technical effects:

[0015] In the utility model: the device can grind different cutting edges of the serrated knife belt during the stepping movement of the serrated knife belt through the cooperation of the driving component, the grinding component and the moving component. The device can grind the cutting edge of the serrated knife belt fully automatically without the need for manual grinding by the staff, thereby effectively reducing the work intensity of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic structural diagram of a knife belt grinding device.

[0017] Figure 2 The utility model is a rear structural schematic diagram of a knife belt grinding device.

[0018] Figure 3 The utility model is a schematic diagram of the side structure of a knife belt grinding device.

[0019] Figure 4 This is a structural schematic diagram of a part of the knife belt grinding device proposed by the utility model, which is an enlarged view of A.

[0020] 1. Mounting plate; 2. Mounting block; 3. Mounting seat; 4. Mounting box; 5. First rotating shaft; 6. Second rotating shaft; 7. Rotating disk; 8. Connecting rod; 9. Transmission block; 10. Push rod; 11. Third rotating shaft; 12. Mounting frame; 13. Fixed plate; 14. Connecting frame; 15. Fixed seat; 16. Grinding disc; 17. Fourth rotating shaft; 18. Cam; 19. Fixed block; 20. Transmission plate; 21. Transmission rod; 22. Limiting plate; 23. Spring; 24. Connecting plate; 25. Connecting block; 26. Motor; 27. Rotating shaft; 28. First pulley; 29. ​​Second pulley; 30. Belt. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0022] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, welding, riveting, bonding, etc., or a detachable connection, threaded connection, key connection, pin connection, etc., or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0024] like Figure 1-4As shown, a knife band grinding device proposed in the utility model comprises a horizontally arranged base plate 1 and a mounting seat 3, wherein the mounting seat 3 is arranged above the base plate 1, and a mounting assembly for mounting a serrated knife band is provided on the base plate 1, and the mounting seat 3 is located in the mounting assembly, and a grinding assembly for grinding the serrated knife band is provided above the mounting seat 3, and a driving assembly is provided on the mounting seat 3, and the driving assembly is transmission-connected with the grinding assembly, and the driving assembly drives the grinding end of the grinding assembly to approach or move away from the cutting edge of the serrated knife band, and a moving assembly for driving the serrated knife band to step and move is provided on the mounting seat 3, and a power assembly is provided on the mounting seat 3, and the power assembly is transmission-connected with the grinding assembly, the driving assembly and the moving assembly respectively.

[0025] The utility model discloses a device for grinding the sawtooth knife belt when the sawtooth knife belt stops moving, and the grinding assembly is driven by the driving assembly to grind the sawtooth knife belt, and when the sawtooth knife belt moves, the grinding assembly is driven by the driving assembly to move away from the sawtooth knife belt, thereby effectively preventing the sawtooth knife belt from contacting the grinding assembly during the movement and causing damage to the sawtooth knife belt. The device can grind different cutting edges of the sawtooth knife belt during the stepping movement of the sawtooth knife belt through the cooperation of the driving assembly, the grinding assembly and the moving assembly. The device can fully automatically grind the cutting edge of the sawtooth knife belt without the need for manual grinding by the staff, thereby effectively reducing the work intensity of the staff and reducing the safety hazards of the staff.

[0026] In an optional embodiment, the mounting assembly includes a plurality of mounting blocks 2, and the plurality of mounting blocks 2 are all arranged on the base plate 1, and the plurality of mounting blocks 2 are arranged at intervals along the shape of the serrated knife band. A first notch is provided at the upper end of the mounting block 2 for inserting the serrated knife band, and the interior of the first notch is slidably arranged in contact with the outer end of the serrated knife band. The serrated knife band can be effectively limited by the first notch on the mounting block 2, and the installation is convenient.

[0027] In an optional embodiment, the power assembly includes an installation box 4, a horizontally arranged first rotating shaft 5, and a horizontally arranged second rotating shaft 6, the installation box 4 is arranged at the upper end of the installation seat 3, one end of the first rotating shaft 5 passes through the installation box 4 and is rotatably connected thereto, the second rotating shaft 6 is vertically arranged with the first rotating shaft 5 and is located below the installation box 4, one end of the second rotating shaft 6 passes through the installation box 4 and is rotatably connected to the installation box 4, the first rotating shaft 5 and the second rotating shaft 6 are connected by a worm gear transmission, the first rotating shaft 5 is transmission-connected to the grinding assembly, the second rotating shaft 6 is transmission-connected to the driving assembly and the moving assembly, and the installation seat 3 is provided with a There is a motor 26, and a rotating shaft 27 is fixedly connected to the output shaft of the motor 26. The rotating shaft 27 is located below the first rotating shaft 5. The rotating shaft 27 is transmission-connected to the first rotating shaft 5. A pulley is coaxially provided on the rotating shaft 27, and a pulley is coaxially provided on the first rotating shaft 5. The two pulleys are driven by a belt, and the first rotating shaft 5 is driven to rotate by the rotating shaft 27. Since the first rotating shaft 5 and the second rotating shaft 6 are connected by a worm gear transmission, and the first rotating shaft 5 is transmission-connected to the grinding assembly, and the second rotating shaft 6 is transmission-connected to the driving assembly and the moving assembly, the device can realize the overall operation of the device through one power source of the motor 26, which effectively reduces the energy consumption of the device.

[0028] In an optional embodiment, the grinding assembly includes a third rotating shaft 11, a connecting frame 14, a fixed seat 15 and a grinding disc 16, the connecting frame 14 is transmission-connected to the driving assembly, two fixed seats 15 are arranged on the connecting frame 14 at intervals, one end of the third rotating shaft 11 passes through the two fixed seats 15 and is respectively rotatably connected thereto, the other end of the third rotating shaft 11 is coaxially connected to the grinding disc 16, the grinding disc 16 is tilted and arranged parallel to the edge of the serrated knife belt, a first pulley 28 is coaxially arranged on the third rotating shaft 11, a second pulley 29 is coaxially arranged on the first rotating shaft 5, and a first through hole for the belt 30 to pass through is provided on the connecting frame 14 The first pulley 28 and the second pulley 29 are connected by the belt 30, and the third rotating shaft 11 completes the transmission with the first rotating shaft 5 through the first pulley 28, the second pulley 29 and the belt 30. Moreover, since the belt 30 has a certain toughness, the transmission can still be achieved even if the third rotating shaft 11 is set tilted. Moreover, since the belt 30 has toughness, the belt 30 can still be achieved during the reciprocating movement of the third rotating shaft 11. The rotation of the third rotating shaft 11 drives the grinding disc 16 to rotate. When the grinding disc 16 rotates, the driving assembly drives the grinding disc 16 to approach the cutting edge of the serrated knife belt to complete the grinding operation of the serrated knife belt.

[0029] In an optional embodiment, the driving assembly includes a mounting frame 12 and a fixing plate 13, the mounting frame 12 being located above the mounting seat 3 and connected to the mounting seat 3 via the fixing plate 13, the mounting frame 12 being provided with a slide groove at one end facing the connecting frame 14, the connecting frame 14 being slidably arranged in the slide groove, the mounting frame 12 being provided with a second through hole interconnected with the first through hole, the mounting frame 12 being provided with a driving unit, the driving unit being transmission connected to the connecting frame 14, the driving unit driving the connecting frame 14 to reciprocate along the sliding direction of the slide groove, the driving unit being transmission connected to the second rotating shaft 6, the connecting frame 14 sliding in the slide groove can effectively limit the connecting frame 14, thereby improving the stability of the movement of the connecting frame 14, and the driving unit can effectively drive the connecting frame 14 to reciprocate, so as to drive the grinding disc 16 to reciprocate and complete the grinding of the cutting edge.

[0030] In an optional embodiment, the driving unit includes a fourth rotating shaft 17, a cam 18, a transmission plate 20, a transmission rod 21, a limiting plate 22, a connecting plate 24 and a connecting block 25. The fourth rotating shaft 17 is spaced apart from the second rotating shaft 6 and is rotatably connected to the mounting seat 3 through a fixing block 19. The fourth rotating shaft 17 is transmission-connected to the second rotating shaft 6. The cam 18 is coaxially fixed on the fourth rotating shaft 17. The connecting block 25 is slidably connected to the mounting frame 12 and is connected to the connecting frame 14. One end of the connecting block 25 extends out of the slide slot and is connected to the The connecting plate 24 is vertically connected, the transmission rod 21 is located at the end of the mounting frame 12 away from the connecting frame 14, one end of which is connected to the connecting plate 24, and the other end of which is connected to the transmission plate 20, and the transmission plate 20 is slidingly arranged in contact with the outer peripheral surface of the cam 18, and the mounting frame 12 is provided with a limit plate 22 at the end away from the connecting frame 14, and the transmission rod 21 is slidably connected to the limit plate 22, and the limit plate 22 is arranged parallel to the connecting plate 24 and connected to it through a spring 23, a pulley is coaxially arranged on the fourth rotating shaft 17, and a pulley is coaxially arranged on the second rotating shaft 6 There are pulleys, and the two pulleys are directly connected by belt transmission. The fourth rotating shaft 17 rotates to drive the cam 18 to rotate. The cam 18 will push the transmission plate 20 that fits with it to move during the rotation. Since the moving path of the connecting frame 14 is limited, the connecting frame 14 can limit the moving path of the transmission plate 20 through the connecting block 25, the connecting plate 24 and the transmission rod 21. Therefore, when the remote point of the cam 18 abuts against the transmission plate 20 during the rotation of the cam 18, the transmission plate 20 moves and drives the transmission rod 21 to move, thereby driving the connecting plate 24 and the connecting block 25 to move to bring The movable connecting frame 14 moves, and the connecting plate 24 will drive the spring 23 to stretch during the movement. When the cam 18 rotates to the point where the proximal point of the cam 18 is close to the transmission plate 20, the spring 23 drives the connecting plate 24, the transmission rod 21 and the transmission plate 20 to reset under the action of the elastic force, thereby achieving the fit with the cam 18. In addition, since there are multiple proximal points on the cam 18, the transmission plate 20 will stop for a period of time during the reciprocating movement. Therefore, in the process of driving the connecting frame 14, the connecting frame 14 will stay at the bottom of the slide groove for a period of time, so as to facilitate the grinding disc 16 to grind the cutting edge of the serrated knife belt.

[0031] In an optional embodiment, the moving assembly includes a rotating disk 7, a transmission block 9 and a lever 10, the rotating disk 7 is coaxially connected to one end of the second rotating shaft 6, and a connecting rod 8 is provided at the end of the rotating disk 7 away from the second rotating shaft 6, and the connecting rod 8 is vertically arranged to the rotating disk 7, one end of the transmission block 9 is connected to the connecting rod 8, and the other end of the transmission block 9 is connected to the lever 10, the lever 10 periodically abuts against the cutting edge of the serrated knife belt, and drives the rotating disk 7 to rotate through the second rotating shaft 6, and during the rotation of the rotating disk 7, the lever 10 is driven to move by the connecting rod 8 and the transmission block 9, and the lever 10 is located at the cutting edge of the serrated knife belt in the initial state, and during the movement of the lever 10, it first abuts against the cutting edge and pushes the serrated knife belt to move, and then the lever 10 falls into another cutting edge during the movement and repeats the above operation, thereby realizing the stepping movement of the serrated knife belt.

[0032] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A knife belt grinding device, characterized in that: The invention comprises a horizontally arranged bottom plate (1) and a mounting seat (3), wherein the mounting seat (3) is arranged above the bottom plate (1), a mounting assembly for mounting a serrated knife belt is arranged on the bottom plate (1), the mounting seat (3) is located inside the mounting assembly, a grinding assembly for grinding the serrated knife belt is arranged above the mounting seat (3), a driving assembly is arranged on the mounting seat (3), the driving assembly is in transmission connection with the grinding assembly, the driving assembly drives the grinding end of the grinding assembly to approach or move away from the cutting edge of the serrated knife belt, a moving assembly for driving the serrated knife belt to move stepwise is arranged on the mounting seat (3), a power assembly is arranged on the mounting seat (3), and the power assembly is respectively in transmission connection with the grinding assembly, the driving assembly and the moving assembly.

2. A knife belt grinding device according to claim 1, characterized in that: The mounting assembly comprises a plurality of mounting blocks (2), the plurality of mounting blocks (2) being arranged on the base plate (1), the plurality of mounting blocks (2) being arranged at intervals along the shape of the sawtooth knife belt, the upper end of the mounting block (2) being provided with a first notch for inserting the sawtooth knife belt, the interior of the first notch being arranged to fit and slide with the outer end of the sawtooth knife belt.

3. A knife belt grinding device according to claim 1, characterized in that: The power assembly comprises an installation box (4), a horizontally arranged first rotating shaft (5), and a horizontally arranged second rotating shaft (6); the installation box (4) is arranged at the upper end of the installation seat (3); one end of the first rotating shaft (5) passes through the installation box (4) and is rotatably connected thereto; the second rotating shaft (6) is arranged vertically with the first rotating shaft (5) and is located below the installation box (4); one end of the second rotating shaft (6) passes through the installation box (4) and is rotatably connected thereto; the first rotating shaft (5) and the second rotating shaft (6) are connected via a worm gear transmission; the first rotating shaft (5) is transmission-connected to the grinding assembly; the second rotating shaft (6) is transmission-connected to the driving assembly and the moving assembly; a motor (26) is provided on the installation seat (3); a rotating shaft (27) is fixedly connected to the output shaft of the motor (26); the rotating shaft (27) is located below the first rotating shaft (5); and the rotating shaft (27) is transmission-connected to the first rotating shaft (5).

4. A knife belt grinding device according to claim 3, characterized in that: The grinding assembly comprises a third rotating shaft (11), a connecting frame (14), a fixed seat (15) and a grinding disc (16); the connecting frame (14) is transmission-connected with the driving assembly; two fixed seats (15) are arranged on the connecting frame (14) at intervals; one end of the third rotating shaft (11) passes through the two fixed seats (15) and is rotationally connected thereto respectively; the other end of the third rotating shaft (11) is coaxially connected with the grinding disc (16); the grinding disc (16) is arranged obliquely and parallel to the cutting edge of the sawtooth knife belt; a first pulley (28) is coaxially arranged on the third rotating shaft (11); a second pulley (29) is coaxially arranged on the first rotating shaft (5); a first through hole for a belt (30) to pass through is arranged on the connecting frame (14); the first pulley (28) and the second pulley (29) are transmission-connected by the belt (30).

5. A knife belt grinding device according to claim 4, characterized in that: The driving assembly comprises a mounting frame (12) and a fixing plate (13); the mounting frame (12) is located above the mounting seat (3) and is connected to the mounting seat (3) via the fixing plate (13); a sliding groove is provided at one end of the mounting frame (12) facing the connecting frame (14); the connecting frame (14) is slidably arranged in the sliding groove; a second through hole interconnected with the first through hole is provided on the mounting frame (12); a driving unit is provided on the mounting frame (12); the driving unit is transmission-connected to the connecting frame (14); the driving unit drives the connecting frame (14) to reciprocate along the sliding direction of the sliding groove; and the driving unit is transmission-connected to the second rotating shaft (6).

6. A knife belt grinding device according to claim 5, characterized in that: The driving unit comprises a fourth rotating shaft (17), a transmission plate (20), a transmission rod (21), a connecting plate (24) and a connecting block (25); the fourth rotating shaft (17) is spaced apart from the second rotating shaft (6) and is rotationally connected to the mounting seat (3) through a fixing block (19); the fourth rotating shaft (17) is transmission-connected to the second rotating shaft (6); a cam (18) is coaxially fixed on the fourth rotating shaft (17); the connecting block (25) is slidably connected to the mounting frame (12) and is connected to the connecting frame (14); one end of the connecting block (25) extends out of the slide slot and is connected to the mounting frame (12). The connecting plate (24) is vertically connected, the transmission rod (21) is located at one end of the mounting frame (12) away from the connecting frame (14), one end of the transmission rod (21) is connected to the connecting plate (24), and the other end of the transmission rod (21) is connected to the transmission plate (20), the transmission plate (20) is slidably arranged in contact with the outer peripheral surface of the cam (18), a limiting plate (22) is provided at one end of the mounting frame (12) away from the connecting frame (14), the transmission rod (21) is slidably connected to the limiting plate (22), and the limiting plate (22) is arranged parallel to the connecting plate (24) and connected to it through a spring (23).

7. The knife belt grinding device according to claim 3, characterized in that: The moving assembly comprises a rotating disk (7), a transmission block (9) and a shifting rod (10); the rotating disk (7) is coaxially connected to one end of the second rotating shaft (6); a connecting rod (8) is provided at one end of the rotating disk (7) away from the second rotating shaft (6); the connecting rod (8) is vertically arranged to the rotating disk (7); one end of the transmission block (9) is connected to the connecting rod (8); the other end of the transmission block (9) is connected to the shifting rod (10); and the shifting rod (10) periodically abuts against the cutting edge of the serrated knife belt.

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