Thread trimming device

Abstract

The utility model belongs to the technical field of hosiery machines, and particularly relates to a thread trimming device which solves the problems that a tool bit cannot be accurately stretched out and drawn back, and a driver is high in cost. The thread trimming device comprises a base, a rotary cutter mounting hole is formed in the base, an outer rotary cutter is arranged in the hole, an inner rotary cutter is arranged on the outer rotary cutter in a penetrating mode, an outer rotary cutter head and an inner rotary cutter head are arranged at the outer end of the outer rotary cutter and the outer end of the inner rotary cutter respectively, a driven gear is arranged at the rear end of the inner rotary cutter in a sleeving mode, and the driven gear is connected with a gear rotation driving mechanism. A first limiting mechanism capable of enabling the driven gear to be axially positioned relative to the inner rotary cutter and rotate in a limited mode in the circumferential direction is arranged between the inner rotary cutter and the driven gear, and a limiting reversing mechanism capable of driving the inner rotary cutter to move outwards in a limited axial mode when the driven gear rotates is arranged between the driven gear and the base. And a second limiting mechanism capable of enabling the inner rotary cutter to be axially positioned relative to the outer rotary cutter and rotate in a limited manner in the circumferential direction is arranged between the inner rotary cutter and the outer rotary cutter. Efficient and accurate rotary shearing and stretching functions are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of sock knitting machines, and particularly relates to a thread cutting device. Background Art

[0002] A sock knitting machine is a knitting mechanical device specifically used for producing socks. Through a series of mechanical and electronic devices, it completes the production process from a wire harness to a sock. The thread cutting device, as an indispensable part of the sock knitting machine, is used to cut the yarn for changing the yarn, withdrawing the yarn, etc.

[0003] In the existing thread cutting devices at present, most adopt a swing plate type thread cutting mechanism, that is, the cutting purpose is achieved through two cutting blades. However, the smooth rotation of the cutting blades often requires a large rotation space, which is not conducive to installation and telescoping in the sock knitting machine. Moreover, most thread cutting devices do not have an efficient telescoping device and cannot smoothly drive the cutting head to move in and out. There are also some thread cutting devices that may be provided with an independent telescoping drive mechanism, that is, the thread cutting device needs to respectively achieve the cutting action and the telescoping action through multiple drivers, which undoubtedly increases the driver cost. Content of the Utility Model

[0004] The purpose of the utility model is to propose a thread cutting device for the above problems existing in the prior art.

[0005] In order to achieve the purpose of the utility model, the following technical solutions can be adopted:

[0006] A thread cutting device includes a base. A rotary cutting knife mounting hole is provided on the base. An outer rotary cutting knife that is circumferentially limited and axially movably connected to the rotary cutting knife mounting hole is arranged in the rotary cutting knife mounting hole. An inner rotary cutting knife that is rotationally connected to the outer rotary cutting knife is penetrated through the outer rotary cutting knife, and the rear end of the inner rotary cutting knife penetrates through the rear end of the outer rotary cutting knife and extends to the outside thereof. Outer rotary knife heads and inner rotary knife heads are respectively arranged at the outer ends of the outer rotary cutting knife and the inner rotary cutting knife. A driven gear is sleeved on the rear end of the inner rotary cutting knife. The driven gear is connected to a gear rotation driving mechanism. A first limiting mechanism that can axially position the driven gear relative to the inner rotary cutting knife and circumferentially limit the rotation is arranged between the inner rotary cutting knife and the driven gear. A limited commutation mechanism that can drive the inner rotary cutting knife to axially move outwardly limitedly when the driven gear rotates is arranged between the driven gear and the base. A second limiting mechanism that can axially position the inner rotary cutting knife relative to the outer rotary cutting knife and circumferentially limit the rotation is arranged between the inner rotary cutting knife and the outer rotary cutting knife.

[0007] The wire cutting device of the present utility model realizes efficient and precise wire harness shearing through rotary cutting and axial movement. Among them, the base is the support and foundation of the entire device, providing a stable installation platform for other components. The rotary cutting tool mounting hole is located on the base and is used to install the outer rotary cutting tool to ensure its stable axial movement during operation while restricting rotation. The inner rotary cutting tool is rotatably arranged inside the outer rotary cutting tool, and the relative rotation between the inner rotary cutting tool and the outer rotary cutting tool can be achieved by driving the inner rotary cutting tool to rotate. The rotation angle of the inner rotary cutting tool is preferably 80-90 degrees. The outer rotary cutting tool head and the inner rotary cutting tool head at the outer end of the rotary cutting tool rotate relatively, and the shearing action is specifically realized in a closing manner. The rear end of the inner rotary cutting tool passes through the rear end of the outer rotary cutting tool and extends to the outside to facilitate connection with the driven gear. The driven gear is driven to rotate by the gear rotation driving mechanism. The first limiting mechanism is used to realize the rotational synchronization of the inner rotary cutting tool and the driven gear within a certain rotation range. The limited commutation mechanism is used to drive the inner rotary cutting tool to perform a certain axial outward movement through the rotation of the driven gear. The second limiting mechanism is used to ensure the axial positioning of the inner rotary cutting tool and the outer rotary cutting tool, so that the outer rotary cutting tool head and the inner rotary cutting tool head can synchronously expand and contract, and the wire harness of the corresponding depth can be sheared. However, it can rotate circumferentially within a limited range, which can yield to the rotation of the inner rotary cutting tool and can also be used to limit the rotation angle.

[0008] In the above wire cutting device, the limited commutation mechanism includes a notch provided at the rear end of the driven gear. A guiding slope surface is provided between one side of the notch and the rear end face of the driven gear. A protrusion capable of moving between the notch, the guiding slope surface and the rear end face of the driven gear is provided on the base, and the protrusion can push the driven gear to move axially when passing through the guiding slope surface.

[0009] The notch is provided at the rear end of the driven gear, which allows the protrusion on the base to enter and interact with it at a specific time. The guiding slope surface is used to smoothly connect the notch and the rear end face of the driven gear, and has the function of guiding the movement of the protrusion and changing its axial distance from the driven gear. When the protrusion moves along the guiding slope surface, it will be guided to move relatively upward or downward, thereby pushing the driven gear to move axially, achieving the effect of driving axial translation through the rotation of the driven gear. Moreover, this displacement distance is limited and can be adjusted by changing the depth of the notch according to actual needs. Of course, the movement of the protrusion mentioned here is actually relative to the driven gear, that is, the protrusion is in a fixed state, and the driven gear realizes axial movement through rotation.

[0010] In the above wire cutting device, a roller capable of sliding contact or rolling contact with the notch, the guiding slope surface and the driven gear is provided on the protrusion.

[0011] The protrusion is specifically in the form of a roller, and its circular shape is conducive to fitting with the guiding slope. At the same time, the roller is fixedly or rotatably connected to the base, and preferably rotatably connected. The roller is in rolling contact with each contact surface, which can reduce resistance, reduce wear, and improve service life.

[0012] In the above-mentioned wire cutting device, the first limiting mechanism includes a first arc-shaped hole circumferentially arranged on the front-end annular sleeve of the driven gear, and a first guiding column is arranged in the first arc-shaped hole, and the inner end of the first guiding column is fixed on the inner rotary cutter.

[0013] The front end of the driven gear is provided with an annular sleeve, forming a structure of a cam gear. The first arc-shaped hole extends along the circumference of the annular sleeve, and its width is adapted to the outer diameter of the first guiding column, realizing the axial telescopic synchronization of the driven gear and the inner rotary cutter. At the same time, its arc-shaped long strip shape enables a certain separation space between the first guiding column and the first arc-shaped hole. That is, when the driven gear is rotated for telescopic drive, the first guiding column slides in the first arc-shaped hole. At this time, there is no rotational synchronization between the driven gear and the inner rotary cutter. After the telescoping is in place, the first guiding column rotates to abut against one end of the first arc-shaped hole. At this time, the driven gear and the inner rotary cutter enter the rotational synchronization state, realizing effective shearing and controlling the driving force cost.

[0014] In the above-mentioned wire cutting device, the second limiting mechanism includes a second arc-shaped hole circumferentially arranged on the outer rotary cutter, and a second guiding column is arranged in the second arc-shaped hole, and the inner end of the second guiding column is fixed on the inner rotary cutter.

[0015] The outer diameter of the second guiding column is adapted to the width of the second arc-shaped hole to ensure axial synchronization. At the same time, the second arc-shaped hole is also in the shape of an arc-shaped long strip, that is, the second guiding column can move circumferentially relative to the second arc-shaped hole, having a certain space for yielding, ensuring the rotation of the inner rotary cutter relative to the outer rotary cutter. At the same time, by adjusting the length of this yielding space, the maximum rotation angle of the inner rotary cutter can be limited.

[0016] As an optimization, the inner rotary cutter is a circular tube, and two groups of guiding column mounting holes are radially penetrated. The main body sections of the first guiding column and the second guiding column are located inside the inner rotary cutter, and the inner ends are inserted or screwed into one of the guiding column mounting holes, and the outer ends penetrate through the other guiding column mounting hole and expose outward. The first guiding column and the second guiding column are inserted into the corresponding rotary cutters in a penetrating manner, and their two ends are respectively connected to the guiding column mounting holes to ensure stable installation. At the same time, one end does not expose to avoid frictional contact with the inner wall of the outer rotary cutter or the inner wall of the annular sleeve, and one end exposes to enter the corresponding arc-shaped hole to ensure the corresponding limiting effect.

[0017] In the above-mentioned wire cutting device, a circumferential reset assembly is provided between the inner rotary cutter and the outer rotary cutter, which can drive the circumferential return of the inner rotary cutter when the rotation and cutting of the inner rotary cutter are completed; an axial reset assembly is provided between the inner rotary cutter and the base, which can drive the inner rotary cutter to move axially inward after the circumferential reset of the inner rotary cutter.

[0018] The circumferential reset assembly and the axial reset assembly enable the wire cutting device to automatically reset to the initial state after completing the cutting action, improving work efficiency and operation convenience, and ensuring the continuous and stable operation of the wire cutting device.

[0019] In the above-mentioned wire cutting device, the circumferential reset assembly includes a reset torsion spring sleeved on the outer rotary cutter. One end of the reset torsion spring is arranged on the second guide post, and the other end is arranged on the outer wall of the outer rotary cutter;

[0020] The axial reset assembly includes a reset tension spring arranged between the rear end of the inner rotary cutter and the base.

[0021] The reset torsion spring is sleeved on the outer rotary cutter and applies an elastic force to the second guide post to rotate towards one end of the second arc-shaped hole, so that the inner rotary cutter has a tendency to rotate to the initial state. Both ends of the reset tension spring are respectively connected to the base and the inner rotary cutter, so that the inner rotary cutter has a tendency to retract towards the rear end.

[0022] As a specific optimization, one end of the reset tension spring is fixed on the tension spring fixing seat of the base, and the other end is fixed on the tension spring post in the inner hole of the inner rotary cutter. The rear end of the base communicates with the outside through the installation port. An installation seat is embedded on the installation port. The flange part of the installation seat is fixed to the rear end of the base by bolts. The inner end of the inner rotary cutter is inserted into the circular docking hole of the installation seat. A tension spring fixing seat is detachably fixed to the outer end of the installation seat. A hook connecting rod is arranged at the inner end of the tension spring fixing seat. One end of the reset tension spring is hooked to the hook connecting rod. A through hole is provided at the outer end of the installation seat to communicate with the tension spring fixing seat. The tension spring fixing seat is detachably arranged, which is convenient for disassembly and assembly and the replacement of the reset tension spring.

[0023] In the above-mentioned wire cutting device, the outer rotary cutter includes an outer rotary cutter rod and an outer rotary cutter head, which are integrally connected. The width of the outer rotary cutter head gradually decreases from the inner end to the outer end, and the cross-section of the outer rotary cutter head is arc-shaped; the inner rotary cutter includes an inner rotary cutter rod and an inner rotary cutter head, which are integrally connected. The width of the inner rotary cutter head gradually decreases from the inner end to the outer end, and the cross-section of the inner rotary cutter head is arc-shaped; knife faces are provided on one side of the outer rotary cutter head opposite to the inner rotary cutter head.

[0024] The external rotation tool bar, as the main part of the external rotary cutter, is connected to the external rotary cutter head. The external rotation tool bar is tubular, and an inner hole is provided through it. The internal rotation tool bar is similar to the external rotation tool bar, connected to the internal rotary cutter head and the driven gear. The internal rotation tool bar is circular tubular, and its outer diameter is adapted to the inner diameter of the inner hole. The internal rotation tool bar is just rotatably inserted into the external rotation tool bar. The external rotary cutter head and the internal rotary cutter head are the key parts for performing the shearing action. Their width gradually decreases from the inner end to the outer end, enabling the cutter head to gradually cut into the wire when contacting the wire, reducing the sudden impact on the wire, thereby improving the shearing quality. At the same time, the cross-section of the cutter head is arc-shaped, which is beneficial to dispersing the shearing force, reducing the wear of the cutter head, increasing the contact area with the wire, and improving the shearing efficiency.

[0025] In the above-mentioned wire cutting device, a telescopic positioning seat is provided at the front end of the rotary cutting tool mounting hole. A D-shaped shaft hole is provided on the telescopic positioning seat. The external rotation tool bar of the external rotary cutter is circumferentially limited and axially movably connected to the D-shaped shaft hole in a matching manner. The telescopic positioning seat is fixed on the base; the external rotary cutter, the internal rotary cutter, the rotary cutting tool mounting hole, and the D-shaped shaft hole are coaxially arranged.

[0026] The telescopic positioning seat is embedded in the rotary cutting tool mounting hole, and its flange part is fixed to the front end of the base by bolts, having flexible detachability. A D-shaped shaft hole is provided on the telescopic positioning seat, and the shape of this hole is similar to the D shape. A flat surface is provided along the axial direction on the external rotation tool bar of the external rotary cutter, forming a D shape to ensure a matching connection with the D-shaped shaft hole, ensuring the circumferential stability of the external rotary cutter and allowing it to move axially as necessary. The external rotary cutter, the internal rotary cutter, the rotary cutting tool mounting hole, and the D-shaped shaft hole are coaxially arranged, eliminating the deviation and error caused by non-coaxiality, enabling the internal rotary cutter and the external rotary cutter to maintain a high degree of consistency and accuracy during relative rotation and telescopic movement.

[0027] In the above-mentioned wire cutting device, as a first feasible solution, the gear rotation driving mechanism includes a reduction motor fixed on the motor mounting part of the base. A driving gear meshing with the driven gear is rotatably connected in the motor mounting part through a rotating shaft, and the output end of the reduction motor is connected to the driving gear.

[0028] In this solution, the gear rotation driving mechanism consists of a motor mounting part fixed on the base, a reduction motor, a rotating shaft, a driving gear, and a driven gear. The output end of the reduction motor is connected to the driving gear. The driving gear rotates in the motor mounting part through the rotating shaft, and the driving gear meshes with the driven gear. The output end of the reduction motor is transmitted to the driven gear through the driving gear, thereby driving the external rotary cutter and the internal rotary cutter to perform rotary shearing. Among them, the reduction motor has the advantages of stable power output, convenient speed regulation, and high control accuracy, and is suitable for scenarios where precise control of the shearing speed and shearing force is required.

[0029] In the above-mentioned wire cutting device, as a second feasible solution, the gear rotation driving mechanism includes a rack meshed and connected with the driven gear. The rack is arranged on a rack seat, and the rack is connected to a linear driver.

[0030] In this solution, the gear rotation driving mechanism includes a rack seat, a linear driver, and a rack arranged on a base. The rack is inserted into the rack seat, and the teeth on the rack are meshed with the driven gear. The axial movement of the rack is controlled by the output end of the linear driver, thereby driving the rotation of the meshed driven gear. The linear driver can be a standard end-mounted cylinder, which has a simple structure and low cost, and is suitable for scenarios with certain cost requirements.

[0031] In the above-mentioned wire cutting device, as a third feasible solution, the gear rotation driving mechanism includes a piston cylinder body. A piston is arranged inside the piston cylinder body. The piston is provided with a rack structure. The driven gear penetrates through a gear through hole on the side wall of the piston cylinder body and is meshed and connected with the rack structure. At least one end of the piston and the piston cylinder body are provided with a piston driving cavity. A connection port communicating with the piston driving cavity is arranged at the end of the piston cylinder body, and the connection ports correspond to the piston driving cavities one by one.

[0032] In this solution, the gear rotation driving mechanism is composed of a piston cylinder body, a piston, and a rack structure arranged on a base. The piston cylinder body is horizontally fixed above the base. A piston is arranged inside. Piston heads at both ends of the piston and the two inner end faces of the piston cylinder body form a piston driving cavity. The piston driving cavity is connected to a hydraulic component through a connection port. The axial movement of the piston is driven by controlling the inflow and outflow of the hydraulic component, thereby achieving the effect of driving the rotation of the driven gear meshed with the rack structure on the piston.

[0033] Furthermore, a piston channel is axially penetrated inside the piston cylinder body. Both ends of the piston channel are closed by end covers. The end covers are fixed to the piston cylinder body in a detachable manner. The main body of the piston is in the shape of a long strip rod. Piston heads are arranged at both ends of the piston. A sealing ring structure is arranged between the piston heads and the inner wall of the piston channel to form a circumferential seal. The piston driving cavity is formed between the piston heads and the end covers. The middle part of the piston cylinder body is horizontally fixed on the top of the base, and a gear through hole is arranged on the lower side of the middle part for the docking and cooperation between the driven gear and the rack structure on the piston. The rack structure is specifically a number of teeth evenly distributed axially on the lower side of the piston. The gear through hole is always located between the two piston heads and will not communicate with the piston driving cavity, ensuring stable driving. A hydraulic component is connected to the connection port. The hydraulic component controls the axial movement of the piston by supplying or discharging working medium into the piston driving cavity. This is the prior art and will not be further elaborated.

[0034] Compared with the prior art, the present utility model mainly has the following advantages:

[0035] 1. The wire cutting device of the present utility model realizes efficient and precise wire harness shearing through rotary cutting and axial movement.

[0036] 2. The notch is arranged at the rear end of the driven gear. When the protrusion moves along the guiding slope surface, it will be guided to move relatively upward or downward, thereby pushing the driven gear to move axially, achieving the effect of driving axial translation through the rotation of the driven gear. Moreover, this displacement distance is limited and can be adjusted by changing the notch depth according to actual needs.

[0037] 3. A circular sleeve is provided at the front end of the driven gear, forming the structure of a cam gear. The arc-shaped long strip shape of the first arc-shaped hole creates a certain separation space between the first guiding column and the first arc-shaped hole, controlling the driving force cost.

[0038] 4. The second arc-shaped hole is in the shape of an arc-shaped long strip. The second guiding column can move circumferentially relative to the second arc-shaped hole, having a certain yielding space, ensuring the rotation of the inner rotary cutter relative to the outer rotary cutter. At the same time, by adjusting the length of this yielding space, the maximum rotation angle of the inner rotary cutter can be limited.

[0039] 5. The circumferential reset component and the axial reset component enable the wire cutting device to automatically reset to the initial state after completing the shearing action, improving work efficiency and operation convenience, and ensuring the continuous and stable operation of the wire cutting device.

[0040] 6. The inner rotary cutter rod is rotatably inserted into the outer rotary cutter rod exactly. The outer rotary cutter head and the inner rotary cutter head are the key parts for performing the shearing action. Their width gradually decreases from the inner end to the outer end, enabling the cutter head to gradually cut into the wire when contacting the wire, reducing the sudden impact on the wire, thereby improving the shearing quality. At the same time, the cross-section of the cutter head is arc-shaped, which is beneficial to dispersing the shearing force, reducing the wear of the cutter head, and increasing the contact area with the wire, improving the shearing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is the overall structural schematic diagram provided by the present utility model (Embodiment 1);

[0042] Figure 2 is the cross-sectional schematic diagram provided by the present utility model (Embodiment 1);

[0043] Figure 3 is the internal structural schematic diagram provided by the present utility model (Embodiment 1);

[0044] Figure 4 is the structural schematic diagram of the driven gear provided by the present utility model;

[0045] Figure 5 is the structural schematic diagram of the outer rotary cutter provided by the present utility model;

[0046] Figure 6 It is a schematic structural diagram of the internal rotary cutter provided by the present utility model;

[0047] Figure 7 It is a schematic overall structural diagram provided by the present utility model (Embodiment 2);

[0048] Figure 8 It is a schematic cross-sectional diagram provided by the present utility model (Embodiment 2);

[0049] Figure 9 It is a schematic overall structural diagram provided by the present utility model (Embodiment 3);

[0050] Figure 10 It is a schematic cross-sectional diagram provided by the present utility model (Embodiment 3).

[0051] In the figure, base 1, rotary cutter mounting hole 11, protrusion 12, roller 13, mounting seat 14, tension spring fixing seat 15, telescopic positioning seat 16, D-shaped shaft hole 17, external rotary cutter 2, external cutter head 21, external cutter rod 22, second arc-shaped hole 23, internal rotary cutter 3, internal cutter head 31, internal cutter rod 32, first guide post 33, second guide post 34, tension spring post 35, driven gear 4, notch 41, guiding slope 42, annular sleeve 43, first arc-shaped hole 44, first limiting mechanism 51, limited commutation mechanism 52, second limiting mechanism 53, gear rotation driving mechanism 6, motor mounting part 61, reduction motor 62, driving gear 63, rack seat 64, linear driver 65, rack 66, piston cylinder block 67, piston 68, gear through hole 69, rack structure 70, piston driving cavity 71, connection port 72, end cover 73, sealing ring structure 74, axial reset assembly 8, reset tension spring 81, circumferential reset assembly 9, reset torsion spring 91. Specific Embodiments

[0052] The following are specific embodiments of the present utility model and in combination with the accompanying drawings, the technical solutions of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0053] Embodiment 1

[0054] Specific embodiments are as follows Figures 1-6As shown in the figure, this wire cutting device includes a base 1. A rotary cutting tool mounting hole 11 is provided on the base 1. An outer rotary cutting tool 2 that is circumferentially limited and axially movably connected thereto is provided in the rotary cutting tool mounting hole 11. An inner rotary cutting tool 3 that is rotatably connected thereto is inserted through the outer rotary cutting tool 2, and the rear end of the inner rotary cutting tool 3 passes through the rear end of the outer rotary cutting tool 2 and extends to the outside thereof. Outer rotary tool heads 21 and inner rotary tool heads 31 are respectively provided at the outer ends of the outer rotary cutting tool 2 and the inner rotary cutting tool 3. A driven gear 4 is sleeved on the rear end of the inner rotary cutting tool 3. The driven gear 4 is connected to a gear rotation driving mechanism 6. A first limiting mechanism 51 that can axially position the driven gear 4 relative to the inner rotary cutting tool 3 and allow limited circumferential rotation is provided between the inner rotary cutting tool 3 and the driven gear 4. A limited commutation mechanism 52 that can drive the inner rotary cutting tool 3 to move axially outwardly in a limited manner when the driven gear 4 rotates is provided between the driven gear 4 and the base 1. A second limiting mechanism 53 that can axially position the inner rotary cutting tool 3 relative to the outer rotary cutting tool 2 and allow limited circumferential rotation is provided between the inner rotary cutting tool 3 and the outer rotary cutting tool 2.

[0055] Specifically, the wire cutting device of the present utility model realizes efficient and precise wire harness cutting through rotary cutting and axial movement. Among them, the base 1 is the support and foundation of the entire device, providing a stable installation platform for other components. The rotary cutting tool mounting hole 11 is located on the base 1 and is used to mount the outer rotary cutting tool 2 to ensure its stable axial movement during operation while restricting rotation. The inner rotary cutting tool 3 is rotatably arranged inside the outer rotary cutting tool 2. By driving the inner rotary cutting tool 3 to rotate, the relative rotation with the outer rotary cutting tool 2 can be realized. The rotation angle of the inner rotary cutting tool 3 is 80 - 90 degrees. The outer rotary tool heads 21 and the inner rotary tool heads 31 at the outer ends of the rotary cutting tools rotate relative to each other, and the shearing action is specifically realized in a closing manner. The rear end of the inner rotary cutting tool 3 passes through the rear end of the outer rotary cutting tool 2 and extends to the outside, facilitating the connection of the driven gear 4. The driven gear 4 is driven to rotate by the gear rotation driving mechanism 6. The first limiting mechanism 51 is used to realize the rotational synchronization of the inner rotary cutting tool 3 and the driven gear 4 within a certain rotation range. The limited commutation mechanism 52 is used to drive the inner rotary cutting tool 3 to perform a certain axial outward movement through the rotation of the driven gear 4. The second limiting mechanism 53 is used to ensure the axial positioning of the inner rotary cutting tool 3 and the outer rotary cutting tool 2, so that the outer rotary tool heads 21 and the inner rotary tool heads 31 can synchronously expand and contract, and the wire harness at the corresponding depth can be sheared, but at the same time, it can rotate circumferentially in a limited manner, which can yield to the rotation of the inner rotary cutting tool 3 and can also be used to limit the rotation angle.

[0056] As Figure 2 、 3, as shown in FIGS. 4, the limited commutation mechanism 52 includes a notch 41 provided at the rear end of the driven gear 4. A guiding slope 42 is provided between one side of the notch 41 and the rear end face of the driven gear 4. A protrusion 12 capable of moving between the notch 41, the guiding slope 42 and the rear end face of the driven gear 4 is provided on the base 1, and when the protrusion 12 passes through the guiding slope 42, it can push the driven gear 4 to move axially. A roller 13 capable of making rolling contact with the notch 41, the guiding slope 42 and the driven gear 4 is provided on the protrusion 12.

[0057] Specifically, the notch 41 is provided at the rear end of the driven gear 4, which allows the protrusion 12 on the base 1 to enter and interact with it at a specific time. The guiding slope 42 is used to smoothly connect the notch 41 and the rear end face of the driven gear 4, and has the function of guiding the movement of the protrusion 12 and changing its axial distance from the driven gear 4. When the protrusion 12 moves along the guiding slope 42, it will be guided to move relatively upward or downward, thereby pushing the driven gear 4 to move axially, achieving the effect of driving axial translation through the rotation of the driven gear 4, and this displacement distance is limited and can be adjusted by changing the depth of the notch 41 according to actual needs. Of course, the movement of the protrusion 12 mentioned here is actually relative to the driven gear 4, that is, the protrusion 12 is in a fixed state, and the driven gear 4 realizes axial movement through rotation. The protrusion 12 is specifically in the form of a roller 13, and its circular shape is conducive to fitting with the guiding slope 42. At the same time, the roller 13 is fixedly and rotatably connected to the base 1, and rolling contact can reduce resistance, reduce wear, and improve service life.

[0058] As Figure 3 , 4 , as shown in FIGS. 5, the first limiting mechanism 51 includes a first arc-shaped hole 44 provided circumferentially on the front-end annular sleeve 43 of the driven gear 4. A first guiding post 33 is provided in the first arc-shaped hole 44, and the inner end of the first guiding post 33 is fixed to the inner rotary cutter 3. The second limiting mechanism 53 includes a second arc-shaped hole 23 provided circumferentially on the outer rotary cutter 2. A second guiding post 34 is provided in the second arc-shaped hole 23, and the inner end of the second guiding post 34 is fixed to the inner rotary cutter 3.

[0059] Specifically, a ring sleeve 43 is provided at the front end of the driven gear 4 to form the structure of a cam gear. The first arc-shaped hole 44 extends circumferentially along the ring sleeve 43, and its width is adapted to the outer diameter of the first guide post 33, realizing the axial telescopic synchronization between the driven gear 4 and the inner rotary cutter 3. At the same time, its arc-shaped long strip shape allows for a certain separation space between the first guide post 33 and the first arc-shaped hole 44. That is, when the driven gear 4 is rotated for telescopic drive, the first guide post 33 slides within the first arc-shaped hole 44. At this time, there is no rotational synchronization between the driven gear 4 and the inner rotary cutter 3. After the telescoping is in place, the first guide post 33 rotates to abut against one end of the first arc-shaped hole 44. At this time, the driven gear 4 and the inner rotary cutter 3 enter the rotational synchronization state, achieving effective shearing and controlling the driving force cost. The outer diameter of the second guide post 34 is adapted to the width of the second arc-shaped hole 23 to ensure axial synchronization. At the same time, the second arc-shaped hole 23 is also in the shape of an arc-shaped long strip, that is, the second guide post 34 can move circumferentially relative to the second arc-shaped hole 23, having a certain space for yielding, ensuring the rotation of the inner rotary cutter 3 relative to the outer rotary cutter 2. At the same time, by adjusting the length of this yielding space, the maximum rotation angle of the inner rotary cutter 3 can be limited.

[0060] In this embodiment, the inner rotary cutter 3 is in the shape of a circular tube, and two groups of guide post mounting holes are radially penetrated. The main body sections of the first guide post 33 and the second guide post 34 are located inside the inner rotary cutter 3, and the inner ends are inserted or screwed into one of the guide post mounting holes, and the outer ends penetrate through the other guide post mounting hole and expose outward. The first guide post 33 and the second guide post 34 are inserted into the corresponding rotary cutters in a penetrating manner, and their two ends are respectively connected to the guide post mounting holes to ensure stable installation. At the same time, one end does not expose to avoid frictional contact with the inner wall of the outer rotary cutter 2 or the inner wall of the ring sleeve 43, and one end exposes to enter the corresponding arc-shaped hole to ensure the corresponding limiting effect.

[0061] As Figure 3 shown, a circumferential reset assembly 9 is provided between the inner rotary cutter 3 and the outer rotary cutter 2, which can drive the circumferential return of the inner rotary cutter 3 when the rotary shearing of the inner rotary cutter 3 ends. The circumferential reset assembly 9 includes a reset torsion spring 91 sleeved on the outer rotary cutter 2. One end of the reset torsion spring 91 is arranged on the second guide post 34, and the other end is arranged on the outer wall of the outer rotary cutter 2. An axial reset assembly 8 is provided between the inner rotary cutter 3 and the base 1, which can drive the axial inward movement of the inner rotary cutter 3 after the circumferential reset of the inner rotary cutter 3. The axial reset assembly 8 includes a reset tension spring 81 arranged between the rear end of the inner rotary cutter 3 and the base 1.

[0062] Specifically, the circumferential reset component 9 and the axial reset component 8 enable the wire cutting device to automatically reset to the initial state after completing the cutting action, improving work efficiency and operation convenience, and ensuring the continuous and stable operation of the wire cutting device. The reset torsion spring 91 is sleeved on the outer rotary cutter 2 and applies an elastic force to the second guide post 34 to rotate towards one end of the second arc-shaped hole 23, so that the inner rotary cutter 3 has a tendency to rotate to the initial state. The two ends of the reset tension spring 81 are respectively connected to the base 1 and the inner rotary cutter 3, so that the inner rotary cutter 3 has a tendency to retract towards the rear end.

[0063] Further, one end of the reset tension spring 81 is fixed on the spring fixing seat 15 of the base 1, and the other end is fixed on the spring post 35 in the inner hole of the inner rotary cutter 3. In this embodiment, the inner end of the first guide post 33 passes through the side wall of the inner rotary cutter 3 and enters the inner hole to serve as the spring post 35. The rear end of the base 1 communicates with the outside through the installation port. An installation seat 14 is embedded on the installation port. The flange part of the installation seat 14 is fixed to the rear end of the base 1 by bolts. The inner end of the inner rotary cutter 3 is inserted into the circular docking hole of the installation seat 14. A spring fixing seat 15 is detachably fixed to the outer end of the installation seat 14. The inner end of the spring fixing seat 15 is provided with a hook connecting rod, and one end of the reset tension spring 81 is hooked to the hook connecting rod. The outer end of the installation seat 14 is provided with a through hole communicating with the spring fixing seat 15. The spring fixing seat 15 is detachably arranged, which is convenient for disassembly and assembly and convenient for replacing the reset tension spring 81.

[0064] As Figure 1 、 5 、shown in 6, the outer rotary cutter 2 includes an outer cutter rod 22 and an outer cutter head 21. The outer cutter rod 22 and the outer cutter head 21 are integrally connected. The width of the outer cutter head 21 gradually decreases from the inner end to the outer end, and the cross section of the outer cutter head 21 is arc-shaped; the inner rotary cutter 3 includes an inner cutter rod 32 and an inner cutter head 31. The inner cutter rod 32 and the inner cutter head 31 are integrally connected. The width of the inner cutter head 31 gradually decreases from the inner end to the outer end, and the cross section of the inner cutter head 31 is arc-shaped; knife surfaces are provided on one side of the outer cutter head 21 opposite to the inner cutter head 31. A telescopic positioning seat 16 is provided at the front end of the rotary cutter installation hole 11. A D-shaped shaft hole 17 is opened on the telescopic positioning seat 16. The outer cutter rod 22 of the outer rotary cutter 2 is circumferentially limited and axially movably connected with the D-shaped shaft hole 17 in a matching manner. The telescopic positioning seat 16 is fixed on the base 1; the outer rotary cutter 2, the inner rotary cutter 3, the rotary cutter installation hole 11, and the D-shaped shaft hole 17 are coaxially arranged.

[0065] Specifically, the outer rotary cutter bar 22, as the main body of the outer rotary cutter 2, is connected to the outer rotary cutter head 21. The outer rotary cutter bar 22 is tubular, and an inner hole is provided through it. The inner rotary cutter bar 32 is similar to the outer rotary cutter bar 22, connected to the inner rotary cutter head 31 and the driven gear 4. The inner rotary cutter bar 32 is circular tubular, and its outer diameter is adapted to the inner diameter of the inner hole. The inner rotary cutter bar 32 is rotatably inserted into the outer rotary cutter bar 22 exactly. The outer rotary cutter head 21 and the inner rotary cutter head 31 are the key parts for performing the shearing action. Their widths gradually decrease from the inner end to the outer end, enabling the cutter head to gradually cut into the wire when contacting it, reducing the sudden impact on the wire, thereby improving the shearing quality. At the same time, the cross-section of the cutter head is arc-shaped, which is beneficial to dispersing the shearing force, reducing the wear of the cutter head, increasing the contact area with the wire, and improving the shearing efficiency. The telescopic positioning seat 16 is arranged on the rotary cutter mounting hole 11. Its flange part is fixed to the front end of the base 1 by bolts, having flexible detachability. The telescopic positioning seat 16 is provided with a D-shaped shaft hole 17, and the shape of this hole is similar to the D shape. A section of plane is arranged along the axial direction on the outer rotary cutter bar 22 of the outer rotary cutter 2 to form a D shape, ensuring a conforming connection with the D-shaped shaft hole 17, guaranteeing the circumferential stability of the outer rotary cutter 2 and allowing it to move axially as necessary. The outer rotary cutter 2, the inner rotary cutter 3, the rotary cutter mounting hole 11, and the D-shaped shaft hole 17 are coaxially arranged, eliminating the deviation and error caused by non-coaxiality, so that the inner rotary cutter 3 and the outer rotary cutter 2 maintain a high degree of consistency and accuracy during relative rotation and telescopic movement.

[0066] In this embodiment, the gear rotation driving mechanism 6 includes a reduction motor 62 fixed on the motor mounting part 61 of the base 1. Inside the motor mounting part 61, a driving gear 63 meshing with the driven gear 4 is rotatably connected through a rotating shaft, and the output end of the reduction motor 62 is connected to the driving gear 63.

[0067] Specifically, the gear rotation driving mechanism 6 is composed of the motor mounting part 61 fixed on the base 1, the reduction motor 62, the rotating shaft, the driving gear 63, and the driven gear 4. The output end of the reduction motor 62 is connected to the driving gear 63. The driving gear 63 rotates inside the motor mounting part 61 through the rotating shaft, and the driving gear 63 meshes with the driven gear 4. The output end of the reduction motor 62 is transmitted to the driven gear 4 through the driving gear 63, thereby driving the outer rotary cutter 2 and the inner rotary cutter 3 to perform rotary shearing. Among them, the reduction motor 62 has the advantages of stable power output, convenient speed regulation, and high control accuracy, and is suitable for scenarios that require precise control of the shearing speed and shearing force.

[0068] Specific working principle: In the initial state, the roller 13 is located at the notch 41, the first guide post 33 is in contact with the left end of the first arc-shaped hole 44, the second guide post 34 is in contact with the right end of the second arc-shaped hole 23, and the inner rotary cutter head 31 and the outer rotary cutter head 21 are in a separated state. When shearing is required to extend, the reduction motor 62 operates, the driven gear 4 rotates, the roller 13 climbs onto the guide slope 42, the inner rotary cutter 3 and the outer rotary cutter 2 extend. At this time, the first guide post 33 rotates to the right end in the first arc-shaped hole 44. After the roller 13 rolls to the rear end face of the driven gear 4, the first guide post 33 is in contact with the right end of the first arc-shaped hole 44, and starts to push the inner rotary cutter 3 to rotate. At the same time, the second guide post 34 starts to rotate in the second arc-shaped hole 23, and the outer cutter head 21 and the inner cutter head 31 rotate relative to each other to shear the wire harness in a closing manner. After the shearing is completed, the reduction motor 62 operates in the reverse direction, and the reset torsion spring 91 and the reset tension spring 81 reset the inner rotary cutter 3 and the outer rotary cutter 2 along with the rotation of the driven gear 4.

[0069] Embodiment 2

[0070] The specific working principle of this embodiment is basically the same as that of Embodiment 1, and the difference lies in the gear rotation driving mechanism 6.

[0071] Specific implementation example Figure 7 、 8 As shown in the figure, the gear rotation driving mechanism 6 includes a rack 66 meshed with the driven gear 4. The rack 66 is arranged on the rack seat 64, and the rack 66 is connected to the linear actuator 65.

[0072] Specifically, the gear rotation driving mechanism 6 includes a rack seat 64, a linear actuator 65 and a rack 66 arranged on the base 1. The rack 66 is inserted into the rack seat 64. The teeth on the rack 66 are meshed with the driven gear 4. The axial movement of the rack 66 is controlled by the telescopic movement of the output end of the linear actuator 65, thereby driving the rotation of the meshed driven gear 4. The linear actuator 65 is selected as an end-mounted standard cylinder, which has a simple structure and low cost, and is suitable for scenarios with certain cost requirements.

[0073] Embodiment 3

[0074] The specific working principle of this embodiment is basically the same as that of Embodiment 1, and the difference lies in the gear rotation driving mechanism 6.

[0075] Specific implementation example Figure 9 、 10As shown in the figure, the gear rotation driving mechanism 6 includes a piston cylinder block 67. A piston 68 is arranged inside the piston cylinder block 67. A rack structure 70 is arranged on the piston 68. The driven gear 4 penetrates through a gear through hole 69 on the side wall of the piston cylinder block 67 and is meshed with the rack structure 70. Piston driving chambers 71 are arranged between both ends of the piston 68 and the piston cylinder block 67. Connection ports 72 communicating with the piston driving chambers 71 are arranged at the ends of the piston cylinder block 67, and the connection ports 72 correspond to the piston driving chambers 71 one by one.

[0076] Specifically, the gear rotation driving mechanism 6 is composed of a piston cylinder block 67, a piston 68, and a rack structure 70 arranged on a base 1. The piston cylinder block 67 is horizontally fixed above the base 1. The piston 68 is arranged inside. Piston driving chambers 71 are formed between the piston heads at both ends of the piston 68 and the two inner end faces of the piston cylinder block 67. The piston driving chambers 71 are connected to corresponding hydraulic components through the connection ports 72. By controlling the inflow and outflow of the hydraulic components, the axial movement of the piston 68 is driven, and further the effect of driving the rotation of the driven gear 4 meshed with the rack structure 70 is achieved. Two sets of connection ports 72 and piston driving chambers 71 are arranged, and driving is achieved through alternating actions, and a greater driving force can be achieved.

[0077] Furthermore, a piston channel is axially penetrated and arranged inside the piston cylinder block 67. Both ends of the piston channel are closed by end covers 73. The end covers 73 are fixed to the piston cylinder block 67 in a detachable manner. The main body of the piston 68 is in a long rod shape. Piston heads are arranged at both ends of the piston 68. A sealing ring structure 74 is arranged between the piston heads and the inner wall of the piston channel to form a circumferential seal. The piston driving chamber 71 is formed between the piston heads and the end covers 73. The middle part of the piston cylinder block 67 is horizontally fixed on the top of the base 1, and a gear through hole 69 is axially penetrated and arranged on the lower side of the middle part for the docking and cooperation between the driven gear 4 and the rack structure 70 on the piston 68. The rack structure 70 is specifically a number of teeth evenly distributed axially on the lower side of the piston 68. The gear through hole 69 is always located between the two piston heads and will not communicate with the piston driving chamber 71 to ensure stable driving. The connection ports 72 are connected with hydraulic components. The hydraulic components achieve the effect of controlling the axial movement of the piston 68 by supplying or discharging working medium into the piston driving chamber 71.

[0078] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A thread trimming device, comprising a base (1), characterized in that: The base (1) is provided with a rotary cutter mounting hole (11), an outer rotary cutter (2) is provided in the rotary cutter mounting hole (11) and is connected to the rotary cutter with a circumferential limit and axial movement, an inner rotary cutter (3) is passed through the outer rotary cutter (2) and is connected to the rotary cutter with a rotation, and the rear end of the inner rotary cutter (3) passes through the rear end of the outer rotary cutter (2) and extends to the outside, an outer rotary cutter head (21) and an inner rotary cutter head (31) are provided on the outer ends of the outer rotary cutter (2) and the inner rotary cutter (3) respectively, a driven gear (4) is sleeved on the rear end of the inner rotary cutter (3), and the driven gear (4) is connected to the gear rotation. The drive mechanism (6) is connected to the inner rotary cutter (3), a first limiting mechanism (51) is provided between the inner rotary cutter (3) and the driven gear (4), and is capable of axially positioning the driven gear (4) relative to the inner rotary cutter (3) and performing limited circumferential rotation; a limited reversing mechanism (52) is provided between the driven gear (4) and the base (1), and is capable of driving the inner rotary cutter (3) to move outward in a limited axial direction when the driven gear (4) rotates; and a second limiting mechanism (53) is provided between the inner rotary cutter (3) and the outer rotary cutter (2), and is capable of axially positioning the inner rotary cutter (3) relative to the outer rotary cutter (2) and performing limited circumferential rotation.

2. The thread trimming device according to claim 1, characterized in that: The limited reversing mechanism (52) comprises a notch (41) arranged on the rear end of the driven gear (4); a guide slope (42) is arranged between one side of the notch (41) and the rear end face of the driven gear (4); a protrusion (12) is arranged on the base (1) and is capable of moving between the notch (41), the guide slope (42) and the rear end face of the driven gear (4); and the protrusion (12) is capable of pushing the driven gear (4) to move axially when passing through the guide slope (42).

3. The thread trimming device according to claim 2, characterized in that: The protrusion (12) is provided with a roller (13) capable of sliding contact or rolling contact with the notch (41), the guide slope (42) and the driven gear (4).

4. The thread cutting device according to claim 1, 2 or 3, characterized in that: The first limiting mechanism (51) comprises a first arc-shaped hole (44) arranged along the circumferential direction on the annular sleeve (43) at the front end of the driven gear (4), a first guide column (33) being arranged in the first arc-shaped hole (44), and an inner end of the first guide column (33) being fixed on the inner rotary cutter (3).

5. The thread trimming device according to claim 4, characterized in that: The second limiting mechanism (53) comprises a second arc-shaped hole (23) arranged along the circumferential direction on the external rotary cutter (2), a second guide column (34) is arranged in the second arc-shaped hole (23), and the inner end of the second guide column (34) is fixed on the internal rotary cutter (3).

6. The thread trimming device according to claim 5, characterized in that: A circumferential resetting component (9) is provided between the inner-rotating cutter (3) and the outer-rotating cutter (2) and is capable of driving the inner-rotating cutter (3) to return to its circumferential position when the rotation shearing is completed; An axial resetting component (8) is provided between the internal rotary cutter (3) and the base (1), which is capable of driving the internal rotary cutter (3) to move axially inward after the internal rotary cutter (3) is circumferentially relocated.

7. The thread trimming device according to claim 6, characterized in that: The circumferential reset assembly (9) comprises a reset torsion spring (91) sleeved on the external rotary cutter (2), one end of the reset torsion spring (91) being arranged on the second guide column (34) and the other end being arranged on the outer wall of the external rotary cutter (2); The axial reset assembly (8) comprises a reset tension spring (81) arranged between the rear end of the internal rotary cutter (3) and the base (1).

8. The thread trimming device according to claim 1, 2 or 3, characterized in that: The externally rotating cutter (2) comprises an externally rotating cutter bar (22) and an externally rotating cutter head (21), wherein the externally rotating cutter bar (22) and the externally rotating cutter head (21) are connected as a whole, the width of the externally rotating cutter head (21) gradually decreases from the inner end to the outer end, and the cross section of the externally rotating cutter head (21) is arc-shaped; The inner-rotating cutter (3) comprises an inner-rotating cutter rod (32) and an inner-rotating cutter head (31), wherein the inner-rotating cutter rod (32) and the inner-rotating cutter head (31) are connected as a whole, the width of the inner-rotating cutter head (31) gradually decreases from the inner end to the outer end, and the cross section of the inner-rotating cutter head (31) is arc-shaped; The outer rotating cutter head (21) and the inner rotating cutter head (31) are both provided with a cutter surface on the side opposite to each other.

9. The thread cutting device according to claim 1, 2 or 3, characterized in that: A telescopic positioning seat (16) is provided at the front end of the rotary cutter mounting hole (11), a D-shaped shaft hole (17) is provided on the telescopic positioning seat (16), the external rotary cutter rod (22) of the external rotary cutter (2) is adapted to be connected with the D-shaped shaft hole (17) in a circumferentially limited and axially movable manner, and the telescopic positioning seat (16) is fixed on the base (1); the external rotary cutter (2), the internal rotary cutter (3), the rotary cutter mounting hole (11), and the D-shaped shaft hole (17) are coaxially arranged.

10. The thread trimming device according to claim 1, 2 or 3, characterized in that: The gear rotation driving mechanism (6) comprises a reduction motor (62) fixed on a motor mounting portion (61) of the base (1); a driving gear (63) meshing with a driven gear (4) is rotatably connected in the motor mounting portion (61) via a rotating shaft; an output end of the reduction motor (62) is connected to the driving gear (63); Alternatively, the gear rotation driving mechanism (6) comprises a rack (66) meshingly connected with the driven gear (4), the rack (66) being arranged on a rack seat (64), and the rack (66) being connected to the linear drive (65); Alternatively, the gear rotation drive mechanism (6) comprises a piston cylinder (67), a piston (68) is arranged in the piston cylinder (67), a rack structure (70) is arranged on the piston (68), a gear through hole (69) penetrating the side wall of the piston cylinder (67) of the driven gear (4) is meshed and connected with the rack structure (70), a piston driving chamber (71) is arranged between at least one end of the piston (68) and the piston cylinder (67), a connecting port (72) connected to the piston driving chamber (71) is arranged at the end of the piston cylinder (67), and the connecting port (72) corresponds to the piston driving chamber (71) one by one.

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