A cutting circle device

Abstract

The present application relates to a kind of cutting device, including shell and the cutting unit for cutting medium housed in the shell, the cutting unit is movably arranged in above-mentioned shell, and first spring is clamped between the cutting unit and shell and extends upwards and downwards, in cutting circle state, above-mentioned cutting unit is forced and is resisted by medium and is moved upwards relative to shell, and above-mentioned first spring is compressed to make above-mentioned cutting unit have the tendency of moving downwards and resetting relative to shell.Compared with prior art, the present application can realize the control of cutting strength, ensure the stability and smooth of cutting process, improve the cutting experience of user, and also can improve cutting quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manual cutting, in particular to a circle cutting device. BACKGROUND

[0002] Circle cutting is the most common pattern in manual cutting operation, and there are many existing circle cutting methods and tools. For example, a puncher is a commonly used circle cutting tool, but it is only suitable for cutting circles with a diameter of 3.5" or less, and it is not suitable for cutting circles with a diameter of more than 3.5". In general, a puncher of one specification can only cut one size of circle, so when multiple sizes of circles need to be cut, multiple specifications of punchers need to be equipped at the same time, which is costly. In addition, a cutting press can also cut circles with a maximum diameter of 9" by cooperating with a corrosion knife, but using this method to cut circles requires the user to have a cutting press, which is inconvenient to use, and the corrosion knife is expensive and has a limited service life.

[0003] Further, the circle cutting device is a special circle cutting device, for example, a Chinese utility model patent with patent number ZL201220188856.2 (CN202592418U) discloses a manual paper circle cutting device, a Chinese utility model patent with patent number ZL202122906952.8 (authorized publication number CN216399780U) discloses a circle cutting paper device, etc.

[0004] However, the existing circle cutting device still has the following problems: when cutting a circle, the handle of the installed blade needs to be pressed down by hand to push the blade edge down to cut into the medium. However, in actual cutting, the pressing action is maintained and the handle is rotated to drive the blade to rotate and cut the medium, which not only makes the operation troublesome, but also because the blade is rigidly installed on the pressing handle, the height of the blade is fixed, making it difficult to control the pressing force. If the user presses too hard, the blade will cut too deep into the medium, causing the blade to be unable to rotate, and if the pressing force is too small, the blade edge will cut too shallow into the medium, resulting in incomplete cutting, which is a poor user experience. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a circle cutting device with controllable cutting force.

[0006] The second technical problem to be solved by the present application is to provide a circle cutting device with controllable and stable cutting force.

[0007] The third technical problem to be solved by the present application is to provide a circle cutting device with controllable cutting force and automatic extension and automatic retraction of the cutting tool.

[0008] The application adopts the technical scheme that at least one of the above technical problems is solved, and the technical scheme is a cutting device, which comprises a shell and a cutting unit arranged in the shell and used for cutting medium, characterized in that the cutting unit is movably arranged in the shell, and a first spring extending upwards and downwards is arranged between the cutting unit and the shell,

[0009] In the cutting state, the cutting unit is forced to move upwards relative to the shell and abuts against the medium, and the first spring is compressed, so that the cutting unit has a tendency to move downwards relative to the shell.

[0010] Further, in the initial state, the cutting unit is limited downwards by the shell, and the first spring is in the compressed state, so that the cutting unit is stably arranged in the shell, and the first spring can better ensure the stability and smoothness of cutting in the cutting state.

[0011] Further, the shell is a sleeve, the cutting unit is inserted into the shell along the length direction of the shell, and an annular gap for embedding and limiting the first spring upwards and downwards is arranged between the cutting unit and the shell, so that the first spring is stably arranged, and the elastic force generated by the deformation of the first spring can better act on the cutting unit.

[0012] Further, the shell is in the shape of a cylinder as a whole, and the cutting unit is in the shape of a cylinder as a whole and matches the inner cavity of the shell,

[0013] Further, a first annular step centered on the central axis is protruded upwards and downwards on the inner circumferential surface of the shell, and a second annular step centered on the central axis is protruded upwards and downwards on the outer surface of the cutting unit, the second annular step is below the first annular step, and the first spring is vertically arranged between the first annular step and the second annular step, so that the first spring is stably arranged between the shell and the cutting unit, and the elastic force of the first spring can better be transmitted to the cutting unit, so that the elastic force is better converted into the pressing force between the cutter and the medium.

[0014] Further, a third annular step centered on the central axis is further protruded upwards and downwards on the inner circumferential surface of the shell, the third annular step is below the second annular step, and in the initial state, the third annular step abuts against the second annular step upwards and downwards, so that the second annular step and the third annular step can limit the cutting unit downwards.

[0015] Further, the cutting unit comprises:

[0016] a cutter used for cutting medium;

[0017] a cutter seat used for arranging the cutter;

[0018] a control member, which is arranged on the knife seat in a slideable manner and is used to drive the knife seat downward;

[0019] a guide locking member, which is arranged above and below and is used to guide the slide of the control member and lock the control member in position;

[0020] a reset spring;

[0021] In the initial state, the knife is hidden and the reset spring is in the original state.

[0022] When the control member is pressed, the control member drives the knife seat downward, and the reset spring is compressed to make the knife seat have a tendency to return upward until the control member is locked in position, the knife on the knife seat is exposed to form a cutting circle state.

[0023] In the cutting circle state, the control member is unlocked, and the reset spring releases the elastic force to drive the knife seat and the control member to return upward. In the initial state, the knife is hidden, so that the user can avoid being injured by the knife and preview the cutting position before cutting without worrying about the medium being cut by mistake. When the control member is pressed, the control member drives the knife seat downward to expose the knife, and then the control member is locked to form a cutting circle state, so that the user can perform a cutting circle operation on the medium. In the cutting circle state, the control member is unlocked, and the knife seat returns upward under the elastic force of the reset spring to hide the knife again. Therefore, the automatic extension and automatic retraction of the knife are realized by controlling the extension and retraction of the knife seat through the control member, which is convenient to operate, improves the safety and prolongs the service life of the knife.

[0024] Further, the control member is provided with a first locking part, and the guide locking member is provided with a second locking part which can cooperate with the first locking part,

[0025] In the initial state, the first locking part is separated from the second locking part, and the control member is in an unlocked state.

[0026] When the control member is moved downward to a position, the control member rotates relative to the guide locking member until the first locking part and the second locking part are locked, and the control member is in a locked state. Therefore, the control member is locked through the cooperation of the first locking part and the second locking part, and the knife seat is locked in the cutting circle state.

[0027] Further, the guide locking member is in a cylindrical shape, and the knob control member includes a rotating part at the lower end, which is also in a cylindrical shape and is embedded in the guide locking member, and the rotating part can rotate relative to the guide locking member around the central axis thereof,

[0028] And, an outer surface of the rotating part is provided with a sliding block, and the guide locking part is provided with a sliding groove for embedding the sliding block and sliding back and forth,

[0029] In the initial state, the sliding block is located at the first end of the sliding groove, the control part is pressed, the sliding block moves downward along the sliding groove, and when the control part is positioned, the sliding block is limited in the sliding groove, the control part is rotated clockwise, the sliding block continues to slide along the sliding groove until the second end of the sliding groove is limited, and the control part is locked to form a circular state;

[0030] And in the circular state, the control part is counterclockwise, the sliding block is separated from the second end of the sliding groove and moves along the sliding groove, and under the action of the reset spring, the sliding block moves upward along the sliding groove to the first end of the sliding groove to form the initial state, wherein the sliding block is the first locking part, and the second end of the sliding groove is the second locking part. In this way, through the sliding cooperation of the sliding block and the sliding groove, on the one hand, the guide of the up and down sliding of the control part can be realized, and on the other hand, the locking and unlocking of the control part can be realized, and the free conversion between the two states can be realized.

[0031] Further, the sliding groove is arranged along the circumference from top to bottom with the center axis of the guide locking part as the center, and the two ends of the sliding groove are the first end and the second end respectively, wherein the height of the first end is higher than that of the second end,

[0032] And the sliding groove includes a first slot body extending vertically and a second slot body extending horizontally along the length direction, and the first end of the sliding groove is located on the first slot body and the second end is located on the second slot body. In this way, through the specific design of the structure of the sliding groove, the guide of the up and down sliding of the control part and the switching between the locking and unlocking control of the control part can be better realized.

[0033] Further, the sliding groove is at least two and is arranged along the circumference of the guide locking part, and correspondingly, the sliding block is also at least two and corresponds to the sliding groove one by one. Thus, the control part can slide up and down more stably, and in the circular state, the control part can be locked more stably, thereby ensuring the reliability of the circular action.

[0034] Further, the tool holder is arranged in the guide locking part, and in the initial state, the tool on the tool holder is hidden in the guide locking part, and in the circular state, the tool extends out of the lower end of the guide locking part and is exposed. It is convenient to realize the hiding and exposure of the tool, and at the same time, it ensures the reliability of the operation of hiding and exposing the tool, avoids the injury of the tool, and effectively realizes the circular operation.

[0035] Further, the tool holder is in the shape of a cylinder, the center axis of the tool holder coincides with the center axis of the guide locking part, and the reset spring is clamped vertically between the tool holder and the guide locking part. In this way, the structure of the tool holder, the control part and the guide locking part is simple, and the assembly of the three is facilitated.

[0036] Further, the outer surface of the knife seat is convexly provided with an upper ring step centered on the central axis of the knife seat in the circumferential direction, and the inner surface of the guide locking member is convexly provided with a lower ring step centered on the central axis of the guide locking member in the circumferential direction, and the lower ring step is located below the upper ring step, and the reset spring is clamped between the lower ring step and the upper ring step. Thus, the stable installation of the reset spring can be realized, and the elastic force of the reset spring in the compressed state can better act on the knife seat, effectively ensuring the upward reset of the knife seat.

[0037] Further, the central axis of the knife seat coincides with the central axis of the rotating part of the control member, and the upper end of the knife seat is hollow and upwardly open, and circumferentially abuts the lower end of the rotating part, so that the downward movement of the control member can reliably drive the downward movement of the knife seat, and the upward reset of the control member can be reliably driven upward when the knife seat is upwardly reset under the action of the reset spring. The cutting tool is installed at the lower end of the knife seat along the central axis of the knife seat, and at least the cutting edge of the cutting tool is exposed to the knife seat.

[0038] Further, at least one side of the knife seat is provided with a pressing table, the bottom surface of the pressing table is a plane and is provided with a ball, and in the cutting circle state, the ball abuts against the medium and can roll relative to the medium. In this way, the ball can smooth and compress the medium during cutting, avoiding displacement of the medium during cutting, and at the same time, the ball can reduce the friction between the medium, thereby improving the smoothness of the cutting rotation action.

[0039] Further, it further comprises a base and a rotating arm, one end of the rotating arm is rotatably connected to the base, and the rotating arm can rotate in the circumferential direction with the base as the center, and the cutter comprising the cutting unit and the shell is detachably installed on the rotating arm and can move back and forth along the length direction of the rotating arm, and in the cutting circle state, the cutting edge of the cutting tool protrudes below the bottom surface of the rotating arm. In this way, rotating the rotating arm with the base as the center can realize the cutting circle action of the cutting unit on the medium, and the distance of the cutting unit relative to the base can be adjusted according to the size of the required cutting circle, and at the same time, pressing down the rotating arm can make the shell move downward relative to the cutting unit under the pressing force, and the cutting force control is convenient.

[0040] Further, the bottom surface of the rotating arm is arranged with a second ball, and in the cutting circle state, the second ball abuts against the medium and can move relative to the medium. On the one hand, the stable placement of the cutting circle device on the medium is facilitated by the support of the second ball, and on the other hand, the rolling of the second ball relative to the medium during cutting can reduce the friction between the medium, thereby improving the smoothness of the cutting rotation action.

[0041] Compared with the prior art, the advantages of the present application are that the cutting unit is movably arranged in the shell, and a first spring extending upward and downward is arranged between the cutting unit and the shell. In the cutting circle state, the cutting unit is forced to move upward relative to the shell and abuts against the medium, and the first spring is compressed to make the cutting unit have a downward resetting tendency relative to the shell. The pressing force between the cutter and the medium corresponds to the elastic force of the first spring, and the compression amount of the first spring changes very little under the condition that the corresponding parameters remain unchanged, and the elastic force is basically stable and uniform and does not change with the user's pressing force, so that during cutting, the blade of the cutter is not pressed too deep into the medium due to too much force of the user, and the medium is not cut due to too little force, so that the stability and smoothness of the cutting process are ensured, the cutting experience of the user is improved, and the cutting quality is improved. In addition, the cut edge is flat, and the cutting circle device in the present application can be applied to cut media of various materials, such as ordinary paper, card paper, felt and photo paper. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 FIG. 1 is a structural schematic view of the cutting circle device in the embodiment of the present application;

[0043] Figure 2 FIG. 2 is a structural schematic view of another direction of the cutting circle device in the embodiment of the present application; Figure 1

[0044] Figure 3 FIG. 3 is a partial structural exploded view of the cutting circle device in the embodiment of the present application;

[0045] Figure 4 FIG. 4 is a structural schematic view of still another direction of the cutting circle device in the embodiment of the present application; Figure 1

[0046] Figure 5 FIG. 5 is a sectional view along the A-A direction of the cutting circle device in the embodiment of the present application; Figure 4

[0047] Figure 6 FIG. 6 is an enlarged view of the C part of the cutting circle device in the embodiment of the present application; Figure 5

[0048] Figure 7 FIG. 7 is a sectional view along the B-B direction of the cutting circle device in the embodiment of the present application; Figure 4

[0049] Figure 8 FIG. 8 is another partial structural exploded view of the cutting circle device in the embodiment of the present application;

[0050] Figure 9 FIG. 9 is a structural schematic view of the cutting unit in the embodiment of the present application;

[0051] Figure 10 FIG. 10 is a structural exploded view of the cutting unit in the embodiment of the present application;

[0052] ​​​​​Figure 11 Structure diagram of the knob in the embodiment of the present application;

[0053] Figure 12 Structure diagram of the guide in the embodiment of the present application. DETAILED DESCRIPTION

[0054] As Figures 1-12 shown, a cutting device includes a cutter 6, which includes a housing 30 and a cutting unit 3 arranged in the housing 30, wherein the cutting unit 3 includes a cutter blade 31 at the bottom end thereof and used for cutting a medium.

[0055] Further, as Figures 1-5 shown, the cutting device of the present application further includes a base 2 and a rotating arm 1, one end of the rotating arm 1 being rotatably connected to the base 2, and the rotating arm 1 being able to rotate circumferentially with the base 2 as the center, and the above-mentioned cutter 6 being detachably mounted on the rotating arm 1 and being able to move back and forth along the length direction of the rotating arm 1. And, the bottom surface of the base 2 is lower than the bottom surface of the rotating arm 1, and in the cutting state, the cutting edge of the cutter blade 31 protrudes below the bottom surface of the rotating arm 1. In this way, rotating the rotating arm 1 with the base 2 as the center can realize the cutting action of the cutting unit 3 on the medium, and the distance of the cutting unit 3 relative to the base 2 can be adjusted according to the size of the circle to be cut. Preferably, as Figure 2 shown, the bottom surface of the rotating arm 1 is arranged with first rolling balls 12, which are in abutment with the medium and are able to move relative to the medium in the cutting state. On the one hand, the support of the first rolling balls 12 is conducive to the stable placement of the cutting device on the medium, and on the other hand, the rolling of the first rolling balls 12 relative to the medium during the cutting process can reduce the friction between the cutting device and the medium, thereby improving the smoothness of the cutting rotating action.

[0056] In the embodiment, as Figure 6 and Figure 7 shown, the cutting unit 3 is movably arranged in the housing 30, and a first spring 36 extending upward and downward is arranged between the cutting unit 3 and the housing 30. In the cutting state, the cutting unit 3 is forced to abut against the medium and moves upward relative to the housing 30, and the first spring 36 is compressed so that the cutting unit 3 has a downward resetting tendency relative to the housing 30.

[0057] It can be seen that the pressing force between the blade edge of the cutter 31 and the medium corresponds to the elastic force of the first spring 36 in the present application, and the compression amount of the first spring 36 changes little under the condition that the corresponding parameters are unchanged, the elastic force is basically stable and uniform, and will not change with the user's hand pressure, so that during cutting, the blade edge of the cutter 31 will not be pressed too deep into the medium to cause cutting failure, and the cutting will not be broken due to too small force, thereby ensuring the stability and smoothness of the cutting process, improving the cutting experience of the user, and improving the cutting quality. In addition, the cut edge is flat, and the cutting device in the present application can be applied to cutting media of various materials, such as ordinary paper, card paper, felt, and photo paper.

[0058] Further, preferably, in the initial state, the cutting unit 3 is limited by the lower limit of the shell 30, and the first spring 36 is in a compressed state. Thus, the cutting unit 3 can be stably installed in the shell 30, and the stability and smoothness of cutting can be better ensured by the first spring 36 in the cutting circle state.

[0059] Further, in the present embodiment, as shown in Figure 6 and Figure 7 , the shell 30 is a sleeve, the cutting unit 3 is inserted along the length direction of the shell 30 in the shell 30, and the cutting unit 3 and the shell 30 surround the annular gap 5 for embedding the first spring 36 in the circumferential direction and limiting the upper and lower positions. Thus, the first spring can be stably installed, and the elastic force generated by the deformation of the first spring 36 can better act on the cutting unit. Further, the shell 30 is in the shape of a cylinder as a whole (composed of three parts, as shown in Figure 10 ), and the cutting unit 3 is in the shape of a cylinder as a whole and matches the inner cavity of the shell 30. Further, the inner circumferential surface of the shell 30 is convexly provided with a first ring step 302 centered on the central axis in the circumferential direction, and the outer surface of the cutting unit 3 is convexly provided with a second ring step 39 centered on the central axis in the circumferential direction, the second ring step 39 is below the first ring step 302, and the first spring 36 is vertically clamped between the first ring step 302 and the second ring step 39, as shown in Figure 6 . Thus, the first spring 36 is stably arranged between the shell 30 and the cutting unit 3, and the elastic force of the first spring 36 can be better transmitted to the cutting unit 3, so that the elastic force is better converted into the pressing force between the cutter 31 and the medium.

[0060] Further, as shown in Figure 6As shown in the drawings, the inner circumferential surface of the shell 30 is further provided with a third annular step 301 which is coaxial with the central axis and is located below the second annular step 39. In the initial state, the third annular step 301 abuts against the second annular step 39. The cooperation between the second annular step 39 and the third annular step 301 can limit the downward movement of the cutting unit 3.

[0061] Further, as shown in the drawings, Figure 9 and Figure 10 The cutting unit 3 further comprises a cutter holder 34, a control member 32, a guide locking member 33 and a return spring 35. The cutter holder 34 is used to mount the cutter 31. The control member 32 is slidably arranged on the cutter holder 34 and is used to drive the cutter holder 34 downward. The guide locking member 33 is arranged above and below the control member 32 and is used to guide the upward and downward sliding of the control member 32 and to lock the control member 32 in the downward position. In the initial state, the cutter 31 is hidden and the return spring 35 is in the original state. When the control member 32 is pressed, the control member 32 is driven downward to drive the cutter holder 34 downward, and the return spring 35 is compressed to make the cutter holder 34 have a tendency to return upward. When the control member 32 is locked in the downward position, the cutter 31 on the cutter holder 34 is exposed to form a cutting circle. In the cutting circle state, the control member 32 is unlocked, and the return spring 35 releases the elastic force to drive the cutter holder 34 and the control member 32 to return upward.

[0062] As shown in the drawings, the cutting unit 3 comprises a cutter holder 34, a control member 32, a guide locking member 33 and a return spring 35. In the initial state, the cutter 31 is hidden, so that the user can preview the cutting position before cutting without worrying about the medium being cut by mistake. When the control member 32 is pressed, the control member 32 drives the cutter holder 34 to move downward to expose the cutter 31. At this time, the control member 32 is locked to form a cutting circle, and the user can perform a cutting circle operation on the medium. In the cutting circle state, the control member 32 is unlocked, and the cutter holder 34 is driven upward by the elastic force of the return spring 35 to return to the original position, so that the cutter 31 is hidden again. As shown in the drawings, Figure 2 、 Figure 3 and Figure 6

[0063] ​Further, the control member 32 is provided with a first locking part, and the guide locking member 33 is provided with a second locking part capable of cooperating with the first locking part. In the initial state, the first locking part is separated from the second locking part, and the control member 32 is in the unlocked state. When the control member 32 is moved downward to the position, the control member 32 rotates relative to the guide locking member 33 until the first locking part and the second locking part are locked with each other, and the control member 33 is in the locked state. Thus, the control member 32 is locked through the cooperation of the first locking part and the second locking part, and the tool holder 34 is locked in the cutting circle state. Further, in the embodiment, the guide locking member 33 is in the cylindrical shape, the control member 32 includes a rotating part 321 at the lower end, the rotating part 321 is also in the cylindrical shape and is embedded in the guide locking member 33, and the rotating part 321 can rotate relative to the guide locking member 33 with the center axis as the center. Further, the outer surface of the rotating part 321 is provided with a sliding block 3211, and the guide locking member 33 is provided with a sliding groove 331 for embedding and sliding back and forth of the sliding block 3211.

[0064] Further, in the initial state, the sliding block 3211 is located at the first end 331a of the sliding groove 331, the control member 32 is pressed, the sliding block 3211 moves downward along the sliding groove 331, and the control member 32 is moved downward to the position, and the sliding block 3211 is limited in the sliding groove 331. The control member 32 is rotated clockwise, the sliding block 3211 continues to slide along the sliding groove 331 until the second end 331b of the sliding groove 331 is limited, the control member 32 is locked to be in the cutting circle state. In the cutting circle state, the control member 32 is counterclockwise, the sliding block 3211 is separated from the second end 331b of the sliding groove 331 and moves along the sliding groove 331, and under the action of the reset spring 35, the sliding block 3211 moves upward along the sliding groove 331 to the first end 331a of the sliding groove 331 to be in the initial state. In the embodiment, the sliding block 3211 is the first locking part, and the second end of the sliding groove 331 is the second locking part. Thus, through the sliding cooperation of the sliding block 3211 and the sliding groove 331, on the one hand, the control member 32 can be guided to slide upward and downward, and on the other hand, the control member 32 can be locked and unlocked, and can be freely converted between the two states.

[0065] In addition, in the embodiment, as shown in Figure 6 The control member 32 further includes a pressing part 322 at the upper end, the pressing part 322 is horizontally arranged and has a disc shape, and is fixed to the top end of the rotating part 321 in the vertically opposite manner, so as to facilitate the user to operate the control member 32 and improve the user experience.

[0066] Further, as shown in Figure 12As shown, the sliding groove 331 is arranged circumferentially from top to bottom with the center axis of the guide locking member 33 as the center, and the two ends of the sliding groove 331 are the first end 331a and the second end 331b respectively, wherein the height of the first end 331a is higher than that of the second end 331b. Moreover, the sliding groove 331 includes a vertically extending first groove body 3311 and a transversely extending second groove body 3312 along the length direction, and the first end 331a of the sliding groove 331 is located on the first groove body 3311 and the second end 331b is located on the second groove body 3312. In this way, through the specific design of the structure of the sliding groove 331, the guiding of the up and down sliding of the control member 32 and the switching between the locking and unlocking control of the control member 32 can be better realized. Further preferably, the upper groove wall of the first groove body 3311 is connected with the side wall of the first groove body 3311 in a smooth manner after the second end 331b of the sliding groove 331 extends upwardly and obliquely, and constitutes the upper groove wall of the sliding groove 331; and the lower groove wall of the first groove body 3311 is connected with the other side wall of the second groove body 3312 after the second end 331b of the sliding groove 331 extends horizontally, and constitutes the lower groove wall of the sliding groove 331. Thus, the sliding block 3211 can move along the sliding groove 331 stably, and then the control member 32 can be lowered stably to drive the tool holder 34 so that the tool 31 is extended, and after being lowered to the position, the control member 32 can be locked by rotating the control member 32.

[0067] Further preferably, as shown in Figure 11 , the upper end of the sliding block 3211 is in the shape of a circular arc, and the shape of the end surface of the second end 331b of the sliding groove 331 matches the outer surface of the corresponding part of the sliding block 3211, and in the tangent circle state, the sliding block 3211 is locked by being clamped into the second end 331b of the sliding groove 331, as shown in Figure 8 . In this way, in the tangent circle state, the sliding block 3211 can be positioned in the second end 331b of the sliding groove 331, thereby realizing the locking of the control member 32, and further realizing the positioning of the tool holder 34, so that the tool holder 34 is stably in the tangent circle state, ensuring the reliability of the tangent circle operation. In addition, in the embodiment, preferably, as shown in Figure 11 and Figure 12 , the sliding groove 331 is two and is arranged circumferentially and spaced apart along the guide locking member 33, and correspondingly, the sliding block 3211 is also two and corresponds to the sliding groove 331 one by one, so that the control member 32 can slide up and down more stably, and in the tangent circle state, the control member 32 can be locked more stably, thereby ensuring the reliability of the tangent circle operation.

[0068] Further, as shown in Figure 6 , Figure 7 and Figure 10As shown in the figure, the outer shape of the above-mentioned knife seat 34 is cylindrical, and the central axis of the knife seat 34 coincides with the central axis of the above-mentioned guide locking member 33. The above-mentioned return spring 35 is clamped between the above-mentioned knife seat 34 and the guide locking member 33 in the vertical direction. In this way, the structure of the knife seat 34, the control member 32 and the guide locking member 33 in this embodiment is simple and facilitates the assembly of the three.

[0069] Further, as shown in the figures Figure 6 , Figure 7 and Figure 10 , the outer surface of the above-mentioned knife seat 34 is convexly provided with an upper ring step 341 centered on the central axis of the knife seat 34 in the circumferential direction, while the inner surface of the guide locking member 33 is convexly provided with a lower ring step 332 centered on the central axis of the guide locking member 33 in the circumferential direction, and the lower ring step 332 is located below the upper ring step 341, and the above-mentioned return spring 35 is clamped between the lower ring step 332 and the upper ring step 341. Thus, the stable installation of the return spring 35 can be achieved, and the elastic force of the return spring 35 in the compressed state can better act on the knife seat 34, effectively ensuring the upward reset of the knife seat 34.

[0070] Further, as shown in the figures Figure 6 , Figure 7 and Figure 10 , in this embodiment, the central axis of the above-mentioned knife seat 34 coincides with the central axis of the rotating part 321 of the above-mentioned control member 32, the upper end of the knife seat 34 is hollow and opens upward, and the top edge of the knife seat 34 is in contact with the bottom edge of the rotating part 321 of the control member 32 in the circumferential direction, so that the downward movement of the control member 32 can reliably drive the downward movement of the knife seat 34, and at the same time, the upward reset of the knife seat 34 can reliably drive the reset of the control member 32 under the action of the return spring 35. The above-mentioned knife tool 31 is installed at the lower end of the knife seat 34 along the central axis of the knife seat 34, and at least the cutting edge of the knife tool 31 is exposed to the knife seat 34.

[0071] Further, as shown in the figures Figure 2 , Figure 7 and Figure 9 , the two sides of the above-mentioned knife seat 34 are respectively provided with a pressing table 38, the bottom surface of the pressing table 38 is a plane and is provided with second ball bearings 381, and in the tangential direction, the second ball bearings 381 are in contact with the medium and can roll relative to the medium. In this way, the second ball bearings 381 can smooth and compress the medium during cutting, avoiding displacement of the medium during cutting, and at the same time, the second ball bearings 381 can reduce the friction between the medium, thereby improving the smoothness of the cutting rotation.

Claims

1. A cutting device, comprising a housing (30) and a cutting unit (3) accommodated in the housing (30) and used for cutting medium, characterized in that, the cutting unit (3) is movably arranged in the housing (30), and a first spring (36) extending upward and downward is arranged between the cutting unit (3) and the housing (30), in a cutting state, the cutting unit (3) is forced to move upward relative to the housing (30) and abut against the medium, and the first spring (36) is compressed so that the cutting unit (3) has a tendency to move downward relative to the housing (30) and reset, the cutting unit (3) comprises: a cutter (31) used for cutting the medium; a cutter seat (34) used for mounting the cutter (31); a control member (32) movably arranged above the cutter seat (34) and used for driving the cutter seat (34) to move downward; a guide locking member (33) arranged upward and downward and used for guiding the upward and downward movement of the control member (32) and locking the control member (32) in a downward position; and a reset spring (35); and in an initial state, the cutter (31) is hidden, and the reset spring (35) is in an original state; pressing the control member (32), the control member (32) moves downward to drive the cutter seat (34) to move downward, and the reset spring (35) is compressed so that the cutter seat (34) has a tendency to reset upward, until the control member (32) is locked in a downward position, the cutter (31) on the cutter seat (34) is exposed to form a cutting state; and in the cutting state, unlocking the control member (32), the reset spring (35) releases the elastic force to drive the cutter seat (34) to move upward and reset the control member (32), the control member (32) is provided with a first locking part, and the guide locking member (33) is provided with a second locking part capable of cooperating with the first locking part, in the initial state, the first locking part and the second locking part are separated, and the control member (32) is in an unlocked state; and in a state where the control member (32) moves downward to the position, the control member (32) rotates relative to the guide locking member (33) until the first locking part and the second locking part are locked, and the control member (32) is in a locked state; the guide locking member (33) is in a cylindrical shape, the control member (32) comprises a rotating part (321) at a lower end, the rotating part (321) is also in a cylindrical shape and is embedded in the guide locking member (33), and the rotating part (321) can rotate relative to the guide locking member (33) with its central axis as the center, and the outer surface of the rotating part (321) is provided with a sliding block (3211), and the guide locking member (33) is provided with a sliding groove (331) for embedding and sliding back and forth of the sliding block (3211). In the initial state, the slider (3211) is located at the first end (331a) of the sliding groove (331), the control member (32) is pressed, the slider (3211) moves downward along the sliding groove (331), and when the control member (32) is positioned, the slider (3211) is limited in the sliding groove (331). Clockwise rotate the control member (32), the slider (3211) continues to slide along the sliding groove (331) until it is limited at the second end (331b) of the sliding groove (331), and the control member (32) is locked into a circular cutting state. In the cutting state, the control member (32) is rotated counterclockwise, the slider (3211) is separated from the second end (331b) of the sliding groove (331) and slides along the sliding groove (331), and under the action of the reset spring (35), it slides up to the first end (331a) of the sliding groove (331) to form the initial state. The slider (3211) is the first locking part, and the second end (331b) of the sliding groove (331) is the second locking part. The sliding groove (331) is arranged circumferentially from top to bottom with the center axis of the guide locking member (33) as the center, and the two ends of the sliding groove (331) are the first end (331a) and the second end (331b), respectively, wherein the height of the first end (331a) is higher than the height of the second end (331b), The sliding groove (331) includes a vertically extending first groove body (3311) and a transversely extending second groove body (3312) along the length direction, and the first end (331a) of the sliding groove (331) is located on the first groove body (3311) and the second end (331b) is located on the second groove body (3312), It also includes a base (2) and a rotating arm (1), one end of the rotating arm (1) is rotatably connected to the base (2), and the rotating arm (1) can rotate circumferentially with the base (2) as the center. The cutter (6) including the cutting unit (3) and the housing (30) can be detachably installed on the rotating arm (1) and can move back and forth along the length direction of the rotating arm (1).

2. The apparatus of claim 1, wherein In the initial state, the cutting unit (3) is limited by the housing (30), and the first spring (36) is in a compressed state.

3. The apparatus of claim 2, wherein: The housing (30) is a sleeve, the cutting unit (3) is inserted into the housing (30) along the length direction of the housing (30), and an annular gap (5) is formed between the cutting unit (3) and the housing (30) for circumferentially embedding and limiting the first spring (36) up and down.

4. The apparatus of claim 3, wherein the cutting means is a circular saw. The housing (30) is a cylinder, and the cutting unit (3) is a cylinder and matches the inner cavity of the housing (30), And, a first annular step (302) is protruded on the inner circumferential surface of the housing (30) in a circumferential direction and is centered on a central axis of the first annular step (302), and a second annular step (39) is protruded on the outer surface of the cutting unit (3) in a circumferential direction and is centered on a central axis of the second annular step (39), the second annular step (39) is located below the first annular step (302), and the first spring (36) is vertically clamped between the first annular step (302) and the second annular step (39).

5. The apparatus of claim 4, wherein: A third annular step (301) is further protruded on the inner circumferential surface of the housing (30) in a circumferential direction and is centered on a central axis of the third annular step (301), the third annular step (301) is located below the second annular step (39), and in an initial state, the third annular step (301) is in abutment with the second annular step (39) in an up-down direction.

6. The tangent device of claim 1 wherein, The sliding grooves (331) are at least two and are evenly arranged in a circumferential direction of the guide locking member (33), and correspondingly, the sliding blocks (3211) are also at least two and correspond to the sliding grooves (331) one by one.

7. The tangent device of claim 1 wherein, The tool holder (34) is arranged in the guide locking member (33), and in an initial state, the cutting tool (31) on the tool holder (34) is hidden in the guide locking member (33), and in a cutting circle state, the cutting tool (31) is exposed by extending out of the lower end of the guide locking member (33).

8. The tangent device of claim 7 wherein, The tool holder (34) is in a cylindrical shape, the central axis of the tool holder (34) coincides with the central axis of the guide locking member (33), and the return spring (35) is clamped vertically between the tool holder (34) and the guide locking member (33).

9. The tangent device of claim 8 wherein, The outer surface of the tool holder (34) is protruded in a circumferential direction and is centered on the central axis of the tool holder (34), and the inner surface of the guide locking member (33) is protruded in a circumferential direction and is centered on the central axis of the guide locking member (33), and the lower annular step (332) is located below the upper annular step (341), and the return spring (35) is clamped between the lower annular step (332) and the upper annular step (341).

10. The tangent device of claim 8 wherein, The central axis of the tool holder (34) coincides with the central axis of the rotating part (321) of the control member (32), the upper end of the tool holder (34) is hollow and opens upward, and is in abutment with the lower end of the rotating part (321) in a circumferential direction, the cutting tool (31) is installed in the lower end of the tool holder (34) along the central axis of the tool holder (34), and at least the cutting edge of the cutting tool (31) is exposed to the tool holder (34).

11. The tangent device of claim 1 wherein, At least one side of the tool holder (34) is provided with a pressing table (38), the bottom surface of the pressing table (38) is a plane and is provided with first rolling balls (381), and in a cutting circle state, the first rolling balls (381) are in abutment with the medium and can roll relative to the medium.

12. The tangent device of claim 1 wherein, The bottom surface of the rotating arm (1) is provided with second rolling balls (12), and in a cutting circle state, the second rolling balls (12) are in abutment with the medium and can roll relative to the medium.

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