An electric cutting machine

Abstract

The present invention relates to an electric cutting machine, which includes a base and a frame arranged on the base. A driving motor is fixedly provided on one side of the frame. The driving motor includes a housing fixedly connected to the frame. The housing has a driving cavity with an opening facing the frame. A driving mechanism is arranged in the driving cavity. The rotating shaft of the driving mechanism passes through the frame and is fixedly installed with a blade located on the other side of the frame. During operation, the driving motor drives the blade to rotate. The driving motor omits the motor cover, and the housing is directly fixedly connected to the frame, with a simple structure. Moreover, the rotating shaft of the driving motor passes through the frame and is fixedly connected to the blade, directly driving the blade to rotate, with a simple transmission, omitting the traditional belt drive or worm gear drive. In addition, the rotating blade can also take away the heat of the driving motor through the flowing air, improving the heat dissipation efficiency, enabling the cutting machine to work more durably without reducing mechanical performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electric cutting machines. Background Art

[0002] An electric cutting knife is a commonly used cloth-cutting tool in the clothing industry. The cloth-cutting machines currently used in the market use a high-speed brushed motor to directly drive the blade to rotate through a worm and a worm gear. Such cloth-cutting machines have the following defects: the motor rotates at a high speed, with high noise, large vibration, easy wear, and frequent lubrication is required. Moreover, the worm and worm gear are core parts, and the assembly process is complex and troublesome to replace. The motor used is a brushed motor, and the carbon brushes need to be frequently replaced, and the rotor is easily worn, resulting in a low service life of the cloth-cutting machine and bringing many inconveniences to users. In summary, such cloth-cutting machines lack competitiveness in the market.

[0003] To solve the above technical defects of the electric cutting knife, Chinese Patent 200910095605.2 discloses an improved technical solution for a cloth-cutting machine, the content of which is: "A cloth-cutting machine includes a motor frame, a chassis mechanism, a machine frame, and a cloth-cutting mechanism. A brushless motor and a belt pulley speed-changing mechanism are installed on the motor frame. The belt pulley speed-changing mechanism includes at least one set of transmission wheels and a transmission belt. The transmission belt drives the transmission wheels to drive the blade to rotate. The transmission wheels are synchronous wheels or belt pulleys or chain gears. The transmission belt is a synchronous belt or a belt or a chain. The belt pulley speed-changing mechanism changes speed through the number of teeth of the transmission wheels or through the diameter of the belt pulleys. There is a space for the height of the blade rotation after the motor frame is connected to the machine frame and for the thickness of the cloth to be cut after the other end of the blade shaft is installed with a transmission wheel." However, the implementation of this technical solution obviously still has the following defects: First, the motor is installed on the machine frame and transmits power through a belt pulley. Since the weight of the motor is the main part of the equipment in the entire cutting knife, this design makes the cutting knife top-heavy and makes the entire mechanical structure very bulky, causing inconvenience to the operator; Second, when the rotation speed of the blade needs to be adjusted, it is necessary to adjust the number of teeth of the transmission wheels or through the diameter of the belt pulleys, making it very inconvenient to use.

[0004] To address the technical deficiencies of this electric cutting knife, Chinese Invention Patent 201210146994.9 discloses an improved technical solution for an electric cutting knife, the content of which is as follows: "An electric cutting knife includes a frame, a cutting mechanism, a chassis mechanism, and a motor control system. The chassis mechanism is installed at the lower part of the frame. The cutting mechanism includes a circular knife and a lower knife, and the lower knife is installed on the chassis mechanism. A brushless motor housing is provided on the frame. The armature coil winding of the brushless motor is pasted inside the motor housing. One end of the permanent magnet rotating shaft of the brushless motor is installed in the bearing at the end of the motor housing, and the other end is installed in the bearing on the motor cover. The rotating shaft of the brushless motor protrudes from the frame disc. The Hall sensor is installed outside the end of the motor housing. The circular knife in the cutting mechanism is directly installed on the rotating shaft of the brushless motor." However, the implementation of this technical solution obviously still has the following deficiencies: First, the brushless motor includes a housing and a motor cover. Using a closed motor is not conducive to motor heat dissipation. After long-term use, the motor overheats seriously, and the mechanical performance is greatly reduced. Second, the armature coil winding is pasted on the motor housing. After long-term use, the motor will heat up, and the high temperature will cause the pasted armature coil winding to separate from the housing, resulting in the rotating shaft and the armature coil winding rotating together, causing serious mechanical failures. Third, the rotating shaft of the brushless motor protrudes from the frame disc, and the circular knife in the cutting mechanism is directly installed on the rotating shaft of the brushless motor. This technical solution is unclear. It cannot clearly disclose the fixed installation method of the motor cover and the frame, nor can it clearly disclose the positional relationship between the circular knife and the frame, let alone clearly disclose the mechanical relationship between the circular knife and the frame disc. For those skilled in the art, this technical solution is unclear. Fourth, three heat dissipation holes are left at the end of the motor housing. Cooling only through the three heat dissipation holes not only has low heat dissipation efficiency, but also users can directly see the internal structure of the motor through the heat dissipation holes, seriously affecting the aesthetics of the product. Fifth, when cutting a large amount of fabric, it is difficult for the cutting machine in the prior art to advance forward for cutting. Usually, the fabric needs to be placed on a conveyor to transport the fabric to the cutting machine for cutting, resulting in a high input cost of the production equipment. Summary of the Invention

[0005] To solve the above problems, the present invention provides an electric cutting machine with simple transmission and high heat dissipation efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electric cutting machine includes a base and a frame disposed on the base. A driving motor is fixedly provided on one side of the frame. The driving motor includes a housing fixedly connected to the frame. The housing has a driving cavity with an opening facing the frame. A driving mechanism is disposed in the driving cavity. The rotating shaft of the driving mechanism passes through the frame and is fixedly installed with a blade on the other side of the frame. During operation, the driving motor drives the blade to rotate.

[0008] As a preferred embodiment, it is further defined that: the driving mechanism includes a rotor assembly and a stator sleeved outside the rotor assembly. The rotor assembly includes the rotating shaft and a plurality of magnetic steels circumferentially distributed on the rotating shaft. Both ends of the rotating shaft are connected to the housing through a first bearing and a second bearing respectively. The front end of the rotating shaft passes through the first bearing and the frame in sequence and is fixedly connected to the blade.

[0009] As a preferred embodiment, it is further defined that: the rotating shaft is sequentially provided with a blade assembly part, a first bearing limiting part, a first bearing assembly part, a magnetic steel limiting part, a magnetic steel assembly part, a second bearing limiting part and a second bearing assembly part from front to back; the upper end of the frame has an installation surface, and a driving hole for the blade assembly part to pass through is provided on the installation surface; the front end of the blade assembly part passes through the driving hole and is fixedly connected with a blade pressing disc; the diameter of the first bearing limiting part is larger than that of the blade assembly part, and a knife groove is formed between the first bearing limiting part and the blade pressing disc. After assembly, the blade is clamped in the knife groove.

[0010] As a preferred embodiment, it is further defined that: the diameter of the first bearing limiting part is larger than that of the first bearing assembly part. The front end of the housing is further provided with a first bearing cavity with a diameter larger than that of the driving cavity. The outer ring of the first bearing is in tight fit with the inner side wall of the first bearing cavity, and the inner ring of the first bearing is in tight fit with the first bearing assembly part.

[0011] As a preferred embodiment, it is further defined that: the diameter of the magnetic steel limiting part is smaller than that of the first bearing assembly part, and the diameter of the magnetic steel limiting part is larger than that of the magnetic steel assembly part. A plurality of the magnetic steels are circumferentially distributed on the magnetic steel assembly part.

[0012] As a preferred embodiment, it is further defined that: the diameter of the second bearing limiting part is smaller than that of the magnetic steel assembly part, the diameter of the second bearing assembly part is smaller than that of the second bearing limiting part. The rear end of the housing is further provided with a second bearing cavity with a diameter smaller than that of the driving cavity. The outer ring of the second bearing is in tight fit with the inner side wall of the second bearing cavity, and the inner ring of the second bearing is in tight fit with the second bearing assembly part.

[0013] As a preferred embodiment, it is further defined that: a frame fixing part fixedly connected to the base is formed by bending the lower end of the frame; the machine shell is further provided with a first concave platform located outside the first bearing cavity and adapted to the installation surface, and during assembly, the installation surface is fixedly connected to the frame within the first concave platform.

[0014] As a preferred embodiment, it is further defined that: a protective cover covering the outside of the blade and fixedly connected to the machine shell is further provided on the other side of the frame; the machine shell is further provided with a second concave platform located outside the first concave platform, and a blade accommodating cavity is formed between the second concave platform and the protective cover. After assembly, the blade is located within the blade accommodating cavity; a first blade notch is provided in the front lower part of the installation surface, and a second blade notch corresponding to the first blade notch is provided in the front lower part of the protective cover, so that the front lower part of the blade accommodating cavity is an open structure, and the front lower end part of the blade is exposed to form a cutting station.

[0015] As a preferred embodiment, it is further defined that: an oil pot notch is provided on the protective cover, and a lubricating oil pot is provided within the oil pot notch.

[0016] As a preferred embodiment, it is further defined that: a blade guard is installed on the machine shell at the front end of the blade; the machine shell is provided with a tooth part composed of a number of array - distributed teeth, and an engaging groove part matching the tooth part is provided on the inner side of the blade guard. The engaging groove part is composed of a number of array - distributed engaging grooves, and the blade guard and the machine shell are adjusted through a pressing mechanism.

[0017] As a preferred embodiment, it is further defined that: the pressing mechanism includes a pressing block, an adjusting screw, and a spring. A through - slot penetrating the engaging groove part is provided on the blade guard, and third concave platforms are provided on the outer side of the blade guard at both edges of the through - slot. The pressing block is provided with a spring cavity for accommodating the spring. A first through - hole for the adjusting screw to pass through is provided at the bottom of the spring cavity. A threaded hole is provided within the tooth part, and an external thread matching the threaded hole is provided at the front end of the adjusting screw. During assembly, the adjusting screw sequentially passes through the spring, the spring cavity, and the first through - hole and is threadedly connected to the threaded hole.

[0018] As a preferred embodiment, it is further defined that: an assembly hole is provided on the machine shell, a pressing groove is provided on the blade guard, and a pressing platform part is provided on the outer side of the pressing groove. The pressing mechanism includes a pressing column and a pressing spring. The pressing column has an insertion part and a pressing head part. The insertion part passes through the pressing spring and the pressing groove and then extends into the assembly hole and is in tight fit with the assembly hole. The pressing head part presses on the pressing platform part under the action of the spring.

[0019] As a preferred embodiment, it is further defined as: a lower knife is arranged on the base, the lower knife is located on the side of the blade away from the frame, and the plane where the blade is located intersects with the plane where the lower knife is located; a distribution plate located at the lower end of the drive motor is also arranged on one side of the frame, and the distribution plate is located on the side of the blade close to the frame.

[0020] As a preferred embodiment, it is further defined as: a wheel assembly is provided at the lower end of the base.

[0021] As a preferred embodiment, it is further defined as: a first assembly hole is provided on the casing, a second through hole is provided on the guard cover corresponding to the first assembly hole, a pressure groove is provided on the knife guard, a pressure platform is provided on the outer side of the pressure groove, the clamping mechanism includes a pressure column, a pressure spring and a pressure sheet, the pressure column has a threaded portion, an insertion portion and a pressure head portion, the front end of the pressure column passes through the pressure spring, the pressure sheet, the pressure groove and the second through hole and then extends into the first assembly hole and is threadedly connected with the first assembly hole through the threaded portion, the pressure sheet rests on the pressure platform portion, and the compression spring is clamped between the pressure sheet and the pressure head portion; the guard cover is provided with an arc-shaped guide strip, and the knife guard is provided with a guide groove matched with the guide strip.

[0022] The beneficial effects of the present invention are:

[0023] 1. The drive motor created by the present invention omits the motor cover, and the casing is directly fixedly connected to the frame, with a simple structure; and the rotating shaft of the drive motor passes through the frame and is fixedly connected to the blade, directly driving the blade to rotate, with simple transmission. In addition, the rotating blade can also take away the heat of the drive motor through the flowing air, thereby improving the heat dissipation efficiency.

[0024] 2. The casing has a driving cavity opening toward the frame, which not only omits the motor cover and reduces the product size, but also simplifies the installation structure, making the installation of the driving motor simpler by directly fixing the casing to the frame.

[0025] 3. By changing the structure of the casing and the structure of the rotating shaft, the assembly of the drive motor is made more secure.

[0026] 4. The outside of the casing is covered with a decorative shell, and there are no exposed heat dissipation holes, which can not only effectively improve the aesthetics of the product, but also have a certain sound insulation effect and reduce working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is one of the structural schematic diagrams created by the present invention;

[0028] Figure 2 This is the second structural schematic diagram of the present invention;

[0029] Figure 3 It is the third structural schematic diagram of the present invention

[0030] Figure 4 It is the structural exploded view of the present invention

[0031] Figure 5 It is the structural schematic diagram of the drive motor

[0032] Figure 6 It is the structural exploded view of the drive motor

[0033] Figure 7 It is the structural schematic diagram of the rotating shaft

[0034] Figure 8 It is the side view of the present invention

[0035] Figure 9 It is the longitudinal sectional view of the present invention

[0036] Figure 10 It is the structural schematic diagram of the drive motor

[0037] Figure 11 It is the partial exploded view of the drive motor

[0038] Figure 12 It is the structural schematic diagram of the frame

[0039] Figure 13 It is the partial structural exploded view of the present invention

[0040] Figure 14 It is one of the structural schematic diagrams of the knife guard

[0041] Figure 15 It is the second structural schematic diagram of the knife guard

[0042] Figure 16 It is the partial assembly structural sectional view of the knife guard

[0043] Figure 17 It is the transverse sectional view of the present invention

[0044] Figure 18 It is the partial structural schematic diagram of the present invention

[0045] Figure 19 It is the bottom structural schematic diagram of the present invention

[0046] Figure 20 It is the bottom structural schematic diagram of the base

[0047] Figure 21 It is the fourth structural schematic diagram of the present invention

[0048] Figure 22 It is the fifth structural schematic diagram of the invention

[0049] Figure 23 is Figure 22 The enlarged schematic diagram at position B of

[0050] Figure 24 It is the structural schematic diagram of the machine housing

[0051] Figure 25 It is the structural schematic diagram of the base

[0052] Figure 26 It is the third structural schematic diagram of the knife guard

[0053] Figure 27 It is the structural exploded view of the second implementation manner of the knife guard

[0054] Figure 28 It is the structural exploded view of the second implementation manner of the pressing mechanism Specific implementation manner

[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners:

[0056] As shown in Figure 1 to Figure 4 shown, an electric cutting machine includes a base 1 and a frame 2 disposed on the base 1. A driving motor 3 is fixedly provided on one side of the frame 2. The driving motor 3 includes a machine housing 31 fixedly connected to the frame 2. A handle 100 is provided on the machine housing 31. A switch 104 is provided on the handle 100. A driving circuit may also be provided. The switch 104 and the driving motor 3 are respectively electrically connected to the driving circuit. The machine housing 31 has a driving cavity 311 with an opening facing the frame 2. A driving mechanism is disposed in the driving cavity 311. A rotating shaft 33 of the driving mechanism passes through the frame 2 and is fixedly installed with a blade 4 located on the other side of the frame 2. During operation, the driving motor 3 drives the blade 4 to rotate. The driving motor omits the motor cover, and the machine housing 31 is directly fixedly connected to the frame 2, with a simple structure; moreover, the rotating shaft 33 of the driving motor 3 passes through the frame 2 and is fixedly connected to the blade 4, directly driving the blade 4 to rotate, with a simple transmission, omitting the traditional belt drive method or worm gear drive method. In addition, the rotating blade can also take away the heat of the driving motor through the flowing air, improving the heat dissipation efficiency, enabling the cutting machine to work more durably without reducing mechanical performance.

[0057] As shown in Figure 5 and Figure 6As shown, the drive mechanism includes a rotor assembly and a stator 32 sleeved outside the rotor assembly. The rotor assembly includes a rotating shaft 33 and a plurality of permanent magnets 34 distributed around the rotating shaft 33. Both ends of the rotating shaft 33 are connected to the housing 31 through a first bearing 35 and a second bearing 36 respectively, so that the rotating shaft 33 can rotate smoothly relative to the housing 31. The front end of the rotating shaft 33 sequentially passes through the first bearing 35 and the frame 2 and is fixedly connected to the blade 4.

[0058] As shown in the appended Figure 7 to the appended Figure 9 As shown, the rotating shaft 33 is sequentially provided with a blade assembly part 331, a first bearing limiting part 332, a first bearing assembly part 333, a permanent magnet limiting part 334, a permanent magnet assembly part 335, a second bearing limiting part 336 and a second bearing assembly part 337 from front to back; the upper end of the frame 2 has a mounting surface 22, and a driving hole 23 for the blade assembly part 331 to pass through is provided on the mounting surface 22; a blade pressing disc 41 is fixedly connected after the front end of the blade assembly part 331 passes through the driving hole 23; the diameter of the first bearing limiting part 332 is larger than that of the blade assembly part 331, and a blade groove 42 is formed between the first bearing limiting part 332 and the blade pressing disc 41. After assembly, the blade 4 is clamped in the blade groove 42. The blade pressing disc 41 and the blade assembly part 331 can be quickly assembled by means of threaded connection, which not only has a simple structure and firm assembly, but also is conducive to quickly replacing the blade.

[0059] In this embodiment, the diameter of the first bearing limiting part 332 is larger than that of the first bearing assembly part 333. The front end of the housing 31 is further provided with a first bearing cavity 312 with a diameter larger than that of the driving cavity 311. The outer ring of the first bearing 35 is in tight fit with the inner side wall of the first bearing cavity 312, and the inner ring of the first bearing 35 is in tight fit with the first bearing assembly part 333. In order to make the assembly of the first bearing 35 more firm, as shown in the appended Figure 7 and the appended Figure 9 As shown, the outer side surface of the inner ring of the first bearing 35 abuts against the inner side surface of the first bearing limiting part 332, effectively increasing the friction between the inner ring of the first bearing 35 and the rotating shaft 33, making the tight fit between the inner ring of the first bearing 35 and the rotating shaft 33 more firm; after the mounting surface 22 of the frame 2 is fixedly connected to the first boss 314, the outer side surface of the outer ring of the first bearing 35 abuts against the edge of the driving hole 23 (i.e., abuts against the inner side surface of the mounting surface 22), effectively increasing the friction between the outer ring of the first bearing 35 and the frame 2, making the fixation of the outer ring of the first bearing 35 more firm, so that the rotating shaft 33 can rotate more smoothly relative to the housing 31.

[0060] In this embodiment, the diameter of the magnet limiting portion 334 is smaller than that of the first bearing assembly portion 333, and the diameter of the magnet limiting portion 334 is larger than that of the magnet assembly portion 335. A plurality of the magnets 34 are distributed around the magnet assembly portion 335. This enables the formation of spaces of different sizes in the drive cavity 311 for assembling the magnets 34 and the stator 32. Further, the side end face of the magnet 34 abuts against the magnet limiting portion 334, limiting the magnet 34 in the axial direction. The assembly structure of the magnet and the rotating shaft 33 is a common technical means in the prior art and will not be specifically described in this embodiment.

[0061] In this embodiment, the diameter of the second bearing limiting portion 336 is smaller than that of the magnet assembly portion 335, and the diameter of the second bearing assembly portion 337 is smaller than that of the second bearing limiting portion 336. A second bearing cavity 313 with a diameter smaller than that of the drive cavity 311 is further provided at the rear end of the housing 31. The outer ring of the second bearing 36 is in tight fit with the inner side wall of the second bearing cavity 313, and the inner ring of the second bearing 36 is in tight fit with the second bearing assembly portion 337. In order to further increase the frictional force between the inner ring of the second bearing 36 and the rotating shaft 33, the outer side face of the inner ring of the second bearing 36 abuts against the second bearing limiting portion 336. As shown in the attached Figure 10 and attached Figure 11 figure, a machine code disk 37 for sensing the rotational displacement of the motor is further provided at the rear end of the housing 31. A heat dissipation notch 39 is provided at the rear end of the housing 31. On the one hand, it can improve the heat dissipation efficiency, and on the other hand, it can facilitate the sensing portion of the machine code disk 37 to extend into the housing 31 to sense the rotational displacement of the motor. In this embodiment, in order to improve the aesthetics of the product, a decorative shell 300 is covered on the outer side of the housing 31. The decorative shell 300 is threadedly connected to the housing 31 and can be quickly installed and disassembled. A circuit board 38 for controlling the drive motor 3 is provided between the decorative shell 300 and the housing 31.

[0062] In this embodiment, in order to further reduce the product size, the housing 31 is further provided with a first concave platform 314 located outside the first bearing cavity 312 and adapted to the mounting surface 22. During assembly, the mounting surface 22 is fixedly connected to the frame 2 in the first concave platform 314. After assembly, the mounting surface 22 is flush with the bottom surface of the second concave platform 315. Thus, the reduced product size is the thickness of the mounting surface 22.

[0063] In order to further reduce the product size, a shield 5 is further provided on the other side of the frame 2, which covers the outside of the blade 4 and is fixedly connected to the housing 31. The housing 31 is further provided with a second concave platform 315 located outside the first concave platform 314. A blade accommodating cavity is formed between the second concave platform 315 and the shield 5. After assembly, the blade 4 is located in the blade accommodating cavity; further, after assembly, the blade 4 is located in the second concave platform 315, and the reduced product size is the thickness of the blade 4. The addition of the shield 5 is for safety protection from the side. It can not only prevent workers from accidentally touching the side or back of the blade when using the cutting scissors, but also prevent the side or back of the blade 4 from accidentally touching the fabric during fabric cutting, with high safety performance.

[0064] In this embodiment, a first blade notch 221 is provided at the front lower part of the mounting surface 22. A second blade notch is correspondingly provided at the front lower part of the shield 5 corresponding to the first blade notch 221, so that the front lower part of the blade accommodating cavity is an open structure, and the front lower end part of the blade 4 is exposed to form a cutting station. As shown in the appendix Figure 8 As shown, the housing 31 is provided with a third blade notch 310 corresponding to the first blade notch 221. In the third blade notch 310, a lamp bead 102 irradiating the cutting station is provided on the housing 31, and the lamp bead 102 is electrically connected to the drive circuit. An oil pot notch 52 is provided on the shield 5, and a lubricating oil pot 6 is provided in the oil pot notch 52. Further, one side of the lubricating oil pot 6 is fixedly connected to the housing 31, and the other side is provided with an oil filling hole 61 communicating with the blade accommodating cavity, facilitating the lubricating oil to be filled into the blade 4 and improving the smoothness of cutting. The oil pot notch 52 is provided at the rear upper part corresponding to the blade 4, which is beneficial for the lubricating oil filled to wet the whole blade from top to bottom.

[0065] As shown in the appendix Figure 13 to the appendix Figure 17As shown, in order to further improve the safety of the cutting machine, a cutter guard 7 is installed on the housing 31 in front of the blade to protect the front and upper front, preventing accidental contact and splashing of lubricating oil. A toothed portion 316 composed of a number of teeth distributed in an array is provided on the housing 31. A slot portion 71 matching the toothed portion 316 is provided inside the cutter guard 7. The slot portion 71 is composed of a number of slots distributed in an array. The cutter guard 7 and the housing 31 are adjusted by a pressing mechanism. Further, the pressing mechanism includes a pressing block 72, an adjusting screw 73 and a spring 74. A through slot 75 penetrating the slot portion 71 is provided on the cutter guard 7. Third concave platforms 76 are provided on both side edges of the through slot 75 on the outer side of the cutter guard 7. The pressing block 72 is provided with a spring cavity 722 for accommodating the spring 74. A first through hole 721 for the adjusting screw 73 to pass through is provided at the bottom of the spring cavity 722. A threaded hole 317 is provided in the toothed portion 316. An external thread 731 matching the threaded hole 317 is provided at the front end of the adjusting screw 73. During assembly, the adjusting screw 73 passes through the spring 74, the spring cavity 722 and the first through hole 721 in sequence and is threadedly connected to the threaded hole 317. When the cutter guard 7 needs to be adjusted, turning the adjusting screw 73 can eject the adjusting screw 73 under the action of the spring 74. After adjusting the relative position between the slot portion 71 and the toothed portion 316, the adjusting screw 73 is tightened again. The cutter guard 7 is firmly pressed on the housing 31 by the pressing block 72. The structure is simple and the adjustment is convenient.

[0066] As shown in the attached Figure 18 to the attached Figure 20 As shown, the base 1 is disc-shaped. An accommodating space 13 is formed at the bottom of the base 1. The base 1 is narrow in the front and wide in the back, low in the front and high in the back, and the side of the base 1 is arc-shaped. This shape is conducive to the base 1 advancing forward when cutting the fabric and separating the cut fabric. The lower end of the frame 2 is bent to form a frame fixing portion 21 fixedly connected to the base 1. A first base hole 11 for the upper end of the frame to pass through is provided on the base 1. After the frame 2 passes through the first base hole 11 from bottom to top, the upper end surface of the frame fixing portion 21 abuts against the bottom of the base 1 and is fixedly connected to the base 1 in the accommodating space 13. The structure is simple and the installation is firm.

[0067] In this embodiment, a lower knife 10 is provided on the base 1. The lower knife 10 is located on the side of the blade 4 away from the frame 2. The plane where the blade 4 is located intersects with the plane where the lower knife 10 is located, which is more conducive to cutting the fabric. A lower knife 10 is also provided on the base 1. The lower knife 10 is located on the side of the blade 4 away from the frame 2. A lower knife fixing portion 101 fixedly connected to the base 1 is formed by bending the lower end of the lower knife 10. The base 1 is further provided with a second base hole 12 for the upper end of the lower knife 10 to pass through. After the frame 2 passes through the second base hole 12 from bottom to top, the upper end surface of the lower knife fixing portion 101 abuts against the bottom of the base 1 and is fixedly connected to the base 1 within the accommodation space 13. The structure is simple and the installation is firm. In this embodiment, a distribution piece 8 is further provided on one side of the frame 2 and located below the drive motor 3. The distribution piece 8 is located on the side of the blade 4 close to the frame 2. The distribution piece 8 can separate the cut fabric to prevent the cut fabric from touching the blade 4 again and affecting the cutting quality. In this embodiment, the first base hole 11 and the second base hole 12 are connected. The lower end of the distribution piece 8 is located at the connection of the first base hole 11 and the second base hole 12. The connection of the first base hole 11 and the second base hole 12 is beneficial to the processing of the base 1 and can be completed in one processing.

[0068] A wheel assembly 9 is provided at the lower end of the base 1. The wheel assembly 9 includes a wheel shaft and at least one wheel provided on the wheel shaft. At the bottom of the base 1, a first wheel shaft block 14 and a second wheel shaft block 15 for fixedly connecting to both ends of the wheel shaft are provided. Wheel grooves 16 with openings facing the wheels are provided on both the first wheel shaft block and the second wheel shaft block. A rotation space for the wheel to rotate is formed between the first wheel shaft block and the second wheel shaft block. Both ends of the wheel shaft are respectively clamped in the wheel grooves 16 of the first wheel shaft block 14 and the second wheel shaft block 15. By adding a plurality of wheel assemblies 9 at the lower end of the base 1 and combining with the perfect production line of the base 1, the cutting machine is easier to push forward when cutting the fabric.

[0069] In this embodiment, the frame 2 is further provided with a fourth blade notch 222 behind the mounting surface 22, so that the rear end portion of the blade 4 is exposed to form a grinding station. A grinding wheel cavity 3100 is provided corresponding to the fourth blade notch 222 at the rear of the machine shell 31. A grinding wheel assembly 103 is installed on the machine shell 31 and located within the grinding wheel cavity 3100. A shielding portion 53 is provided on the guard 5 corresponding to the grinding wheel assembly 103, which effectively prevents metal chips from splashing when the grinding wheel assembly 103 grinds the blade 4, and has high safety.

[0070] As shown in the attached Figure 21 and attached Figure 24As shown, a heat sink 318 is provided on the housing 31. Further, the heat sink 318 is located outside the drive cavity 311 and is connected to the drive cavity 311, which is conducive to quickly dissipating the heat of the drive motor 3. The heat sink 318 is arranged in a wavy shape to effectively increase the heat dissipation area.

[0071] As shown in the appended Figure 22 , the appended Figure 23 , the appended Figure 27 and the appended Figure 28 As shown, there is also a second embodiment of the cutter guard 7. A first assembly hole 319 is provided on the housing 31, a second through hole 57 corresponding to the first assembly hole is provided on the guard 5, a pressing groove 701 is provided on the cutter guard 7, and a pressing table portion 702 is provided outside the pressing groove 701. The pressing mechanism also has a second embodiment corresponding to the cutter guard 7. The pressing mechanism includes a pressing column 77, a pressing spring 78 and a pressing piece 79. The pressing column has a threaded portion 770, an insertion portion 771 and a pressing head portion 772. The front end of the pressing column passes through the pressing spring 78, the pressing piece 79, the pressing groove 701 and the second through hole 57 and then extends into the first assembly hole 319 and is threadedly connected to the first assembly hole 319 through the threaded portion 770. The pressing piece 79 abuts against the pressing table portion 702, and the pressing spring 78 is clamped between the pressing piece 79 and the pressing head portion 772. When the position of the cutter guard 7 needs to be adjusted, the pressing column 77 can be loosened, and after the adjustment is completed, the pressing column 77 can be tightened. The operation is simple and convenient. The pressing spring 78 enables the pressing piece 79 to always press on the pressing table portion 702 to keep the cutter guard 7 fixed, and the design is ingenious. In addition, an arc-shaped guiding strip 56 is provided on the guard 5, and a guiding groove 70 adapted to the guiding strip 56 is provided on the cutter guard 7. The adjustment stroke of the cutter guard 7 is limited by the cooperation of the guiding strip 56 and the guiding groove 70.

[0072] As shown in the appended Figure 22 and the appended Figure 26 As shown, a transverse lower blocking portion 54 bent toward the blade 4 is provided at the rear end of the guard 5, and a longitudinal lower blocking portion 55 extends downward from the lower end of the transverse lower blocking portion 54. The rear end of the guard 5 is protected by the transverse lower blocking portion 54 and the longitudinal lower blocking portion 55 to prevent cloth scraps or cloth pieces from entering the guard 5 and then entering the housing.

[0073] As shown in the appended Figure 25As shown, both sides of the base 1 have side inclined surfaces 17, the included angle between the side inclined surfaces 17 and the horizontal plane is 20° ± 5°, the front end of the base 1 has a front inclined surface 18, the included angle between the front inclined surface 18 and the horizontal plane is 10° ± 5°, the rear end of the base 1 has a rear inclined surface 19, and the included angle between the rear inclined surface 19 and the horizontal plane is 20° ± 5°. The front inclined surface facilitates the easier forward advancement of the cutting machine when cutting fabrics, and the side inclined surfaces facilitate the outward separation of the cut fabrics.

[0074] As shown in the attached Figure 22 As shown, a touch switch button cap 105 and the switch 104 are provided at the upper end of the handle 100, and a grip groove 106 adapted to the human finger is provided at the lower end of the handle 100. When the hand is held on the handle 100, the finger is located in the grip groove 106, which can improve the comfort of the user during use.

Claims

1. An electric cutting machine, comprising a base (1) and a frame (2) disposed on the base (1). A driving motor (3) is fixedly provided on one side of the frame (2). The driving motor (3) includes a housing (31) fixedly connected to the frame (2). The housing (31) has a driving cavity (311) with an opening facing the frame (2). A driving mechanism is disposed in the driving cavity (311). The driving mechanism includes a rotor assembly and a stator (32) sleeved outside the rotor assembly. The rotor assembly includes a rotating shaft (33) and a plurality of magnetic steels (34) circumferentially distributed on the rotating shaft (33). Two ends of the rotating shaft (33) are respectively connected to the housing (31) through a first bearing (35) and a second bearing (36). The front end of the rotating shaft (33) sequentially passes through the first bearing (35) and is fixedly connected to a blade (4). A blade (4) is fixedly installed on the rotating shaft (33) of the driving mechanism. During operation, the driving motor (3) drives the blade (4) to rotate; characterized in that A first bearing cavity (312) with a diameter larger than that of the driving cavity (311) is further provided at the front end of the casing (31). One end of the rotating shaft (33) is provided with a circular convex disk having a diameter larger than that of the rotating shaft (33). The outer wall of the circular convex disk forms a first bearing assembly portion (333). The first bearing (35) is mounted on the first bearing assembly portion (333). The second bearing (36) is mounted at the other end of the rotating shaft (33). A magnet assembly portion (335) having a diameter smaller than that of the circular convex disk is provided on the rotating shaft (33) inside the circular convex disk. The magnet (34) is fixed on the magnet assembly portion (335). A blade assembly portion (331) having a diameter smaller than that of the circular convex disk is provided on the rotating shaft (33) outside the circular convex disk. When the rotating shaft (33) is placed in the driving cavity (311), the circular convex disk and the first bearing (35) are located at the first bearing cavity (312). The outer ring of the first bearing (35) on the circular convex disk is in tight fit with the inner side wall of the first bearing cavity (312), so that the circular convex disk and the first bearing (35) together serve as a rotating sealing disk to seal the end of the driving cavity (311), and the stator (32) and the magnet (34) inside the stator (32) are sealed in the driving motor (3). The upper end of the frame (2) has a mounting surface (22). A driving hole (23) for the blade assembly portion (331) to pass through is provided on the mounting surface (22). After the blade assembly portion (331) passes through the driving hole (23) of the frame (2), the blade (4) located on the other side of the frame (2) is fixedly installed. The rotating shaft (33) is sequentially provided with the blade assembly portion (331), a first bearing limiting portion (332), the first bearing assembly portion (333), a magnet limiting portion (334), the magnet assembly portion (335), a second bearing limiting portion (336), and a second bearing assembly portion (337) from front to back. The diameter of the first bearing limiting portion (332) is larger than that of the blade assembly portion (331). A knife groove (42) is formed between the first bearing limiting portion (332) and the blade pressing disk (41). After assembly, the blade (4) is clamped in the knife groove (42).

2. The electric cutting machine according to claim 1, characterized in that The diameter of the magnet limiting portion (334) is smaller than that of the first bearing assembly portion (333), and the diameter of the magnet limiting portion (334) is larger than that of the magnet assembly portion (335). A plurality of the magnets (34) are distributed around the magnet assembly portion (335).

3. The electric cutting machine according to claim 2, characterized in that The diameter of the second bearing limiting portion (336) is smaller than the diameter of the magnet assembly portion (335), the diameter of the second bearing assembly portion (337) is smaller than the diameter of the second bearing limiting portion (336), a second bearing cavity (313) with a diameter smaller than that of the drive cavity (311) is further provided at the rear end of the machine housing (31), the outer ring of the second bearing (36) is in tight fit with the inner side wall of the second bearing cavity (313), and the inner ring of the second bearing (36) is in tight fit with the second bearing assembly portion (337).

4. The electric cutting machine according to any one of claims 2-3, characterized in that A frame fixing portion (21) fixedly connected to the base (1) is formed by bending the lower end of the frame (2); the machine housing (31) is further provided with a first concave platform (314) located outside the first bearing cavity (312) and adapted to the mounting surface (22), and during assembly, the mounting surface (22) is fixedly connected to the frame (2) within the first concave platform (314).

5. The electric cutting machine according to any one of claims 2-3, characterized in that A protective cover (5) covering the outside of the blade (4) and fixedly connected to the machine housing (31) is further provided on the other side of the frame (2), the machine housing (31) is further provided with a second concave platform (315) located outside the first concave platform (314), a blade accommodating cavity is formed between the second concave platform (315) and the protective cover (5), and after assembly, the blade (4) is located within the blade accommodating cavity; a first blade notch (221) is provided at the front lower part of the mounting surface (22), and a second blade notch (51) corresponding to the first blade notch (221) is provided at the front lower part of the protective cover (5), so that the front lower part of the blade accommodating cavity is an open structure, and the front lower end portion of the blade (4) is exposed to form a cutting station.

6. The electric cutting machine according to claim 5, characterized in that An oil pot notch (52) is provided on the protective cover (5), and a lubricating oil pot (6) is provided within the oil pot notch (52).

7. The electric cutting machine according to any one of claims 2-3, characterized in that A blade guard (7) located at the front end of the blade (4) is mounted on the machine housing (31); the machine housing (31) is provided with a tooth portion (316) composed of a plurality of arrayed teeth, an engaging slot portion (71) matching the tooth portion (316) is provided on the inner side of the blade guard (7), the engaging slot portion (71) is composed of a plurality of arrayed engaging slots, and the blade guard (7) and the machine housing (31) are adjusted by a pressing mechanism.

8. The electric cutting machine according to claim 7, characterized in that The clamping mechanism comprises a pressing block (72), an adjusting screw (73) and a spring (74); a through slot (75) penetrating the slot portion (71) is provided on the knife guard (7); a third recess (76) is provided on the outer side of the knife guard (7) and is located at the two side edges of the through slot (75); the pressing block (72) is provided with a spring cavity (722) for accommodating the spring (74); a first through hole (721) for passing the adjusting screw (73) is provided at the bottom of the spring cavity (722); a threaded hole (317) is provided in the tooth portion (316); an external thread matching the threaded hole (317) is provided at the front end of the adjusting screw (73); when assembled, the adjusting screw (73) passes through the spring (74), the spring cavity (722) and the first through hole (721) in sequence and is threadedly connected to the threaded hole (317).

9. The electric cutting machine according to claim 1, characterized in that The housing (31) is provided with an assembly hole, the knife guard (7) is provided with a pressing groove (701), a pressing platform (702) is provided on the outer side of the pressing groove (701), the pressing mechanism comprises a pressing column (77) and a pressing spring (78), the pressing column comprises an insertion portion (771) and a pressing head portion (772), the insertion portion (771) passes through the pressing spring (78) and the pressing groove (701), and then extends into the assembly hole and is tightly matched with the assembly hole, and the pressing head portion (772) is pressed on the pressing platform portion (702) under the action of the spring.

10. The electric cutting machine according to any one of claims 2-3, characterized in that A lower knife (10) is provided on the base (1), and the lower knife (10) is located on a side of the blade (4) facing away from the frame (2), and a plane where the blade (4) is located intersects with a plane where the lower knife (10) is located; a distribution plate (8) located at a lower end of the drive motor (3) is also provided on one side of the frame (2), and the distribution plate (8) is located on a side of the blade (4) close to the frame (2).

11. The electric cutting machine according to any one of claims 2-3, characterized in that The base (1) has side slopes (17) on both sides, and the angle between the side slopes (17) and the horizontal plane is 20°±5°. The front end of the base (1) has a front slope (18), and the angle between the front slope (18) and the horizontal plane is 10°±5°. The rear end of the base (1) has a rear slope (19), and the angle between the rear slope (19) and the horizontal plane is 20°±5°.

12. The electric cutting machine according to any one of claims 2-3, characterized in that A first assembly hole (319) is provided on the casing (31), a second through hole (57) corresponding to the first assembly hole is provided on the shield (5), a pressing groove (701) is provided on the knife guard (7), a pressing table portion (702) is provided outside the pressing groove (701), the pressing mechanism includes a pressing column (77), a pressing spring (78) and a pressing piece (79), the pressing column has a threaded portion (770), an insertion portion (771) and a pressing head portion (772), the front end of the pressing column passes through the pressing spring (78), the pressing piece (79), the pressing groove (701) and the second through hole (57) and then extends into the first assembly hole (319) and is threadedly connected to the first assembly hole (319) through the threaded portion (770), the pressing piece (79) abuts against the pressing table portion (702), and the pressing spring (78) is clamped between the pressing piece (79) and the pressing head portion (772); an arc-shaped guiding strip (56) is provided on the shield (5), and a guiding groove (70) adapted to the guiding strip (56) is provided on the knife guard (7).

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