Thread trimming device

Abstract

The invention belongs to the technical field of hosiery machines, particularly relates to a thread trimming device, and solves the problems that a tool bit cannot be accurately stretched out and drawn back, and the cost of a driver is high. 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 invention belongs to the technical field of sock machines, and in particular relates to a thread trimming device. Background Art

[0002] A sock machine is a type of knitting machinery specially used for producing socks. It completes the production process from wire harness to socks through a series of mechanical and electronic devices. The thread cutting device, as an indispensable part of the sock machine, is used to cut the yarn for yarn replacement, yarn withdrawal, etc.

[0003] Most of the currently available thread trimming devices use a movable plate thread trimming mechanism, that is, the cutting purpose is achieved through two scissor blades, but the smooth rotation of the scissor blades often requires a large rotation space, which is not conducive to installation and extension in the sock machine, and most of the thread trimming devices do not have an efficient extension device and cannot smoothly drive the scissor heads in and out. Some thread trimming devices may also be provided with an independent extension drive mechanism, that is, the thread trimming device needs to use multiple drivers to respectively achieve the cutting action and the extension action, which undoubtedly increases the driver cost. Summary of the invention

[0004] The purpose of the present invention is to provide a thread cutting device in view of the above problems existing in the prior art.

[0005] In order to achieve the purpose of the invention, the following technical solutions can be used:

[0006] A thread cutting device comprises a base, wherein the base is provided with a rotary cutter mounting hole, an outer rotary cutter connected to the rotary cutter mounting hole and circumferentially limited and axially movable is provided, the outer rotary cutter is penetrated by an inner rotary cutter connected to rotation thereof, and the rear end of the inner rotary cutter is penetrated by the rear end of the outer rotary cutter and extends to the outside thereof, an outer rotary cutter head and an inner rotary cutter head are respectively provided on the outer ends of the outer rotary cutter and the inner rotary cutter, a driven gear is sleeved on the rear end of the inner rotary cutter, the driven gear is connected to the gear rotation driving mechanism, a first limiting mechanism is provided between the inner rotary cutter and the driven gear, which can enable the driven gear to axially position relative to the inner rotary cutter and to rotate circumferentially to a limited extent, a limited reversing mechanism is provided between the driven gear and the base, which can drive the inner rotary cutter to move outward axially to a limited extent when the driven gear rotates, and a second limiting mechanism is provided between the inner rotary cutter and the outer rotary cutter, which can enable the inner rotary cutter to axially position relative to the outer rotary cutter and to rotate circumferentially to a limited extent.

[0007] The wire cutting device of the present invention realizes efficient and accurate wire harness cutting through rotary cutting and axial movement, wherein the base is the support and foundation of the entire device, and provides a stable installation platform for other components. The rotary cutter installation hole is located on the base, and is used to install the outer rotary cutter, ensuring that it can stably move axially during operation, while limiting rotation. The inner rotary cutter is rotatably arranged in the outer rotary cutter, and the relative rotation with the outer rotary cutter can be realized by driving the inner rotary cutter to rotate. The rotation angle of the inner rotary cutter is preferably 80-90 degrees. The outer rotary cutter head and the inner rotary cutter head at the outer end of the rotary cutter rotate relative to each other, and the shearing action is specifically realized in a closing manner. The rear end of the inner rotary cutter passes through the rear end of the outer rotary cutter and extends to the outside, which is convenient for connecting to 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 synchronous rotation of the inner rotary cutter and the driven gear within a certain rotation range. The limited reversing mechanism is used to drive the inner rotary cutter to move axially outward to a certain extent through the rotation of the driven gear. The second limiting mechanism is used to ensure the axial positioning of the inner rotary cutter and the outer rotary cutter, so that the outer rotary cutter head and the inner rotary cutter head can be synchronously extended and retracted to cut the wire harness to the corresponding depth, but at the same time, it can rotate circumferentially to a limited extent, which can give way to the rotation of the inner rotary cutter and can also be used to limit the rotation angle.

[0008] In the above-mentioned thread trimming device, the limited reversing mechanism includes a notch arranged on the rear end of the driven gear, a guide slope is provided between one side of the notch and the rear end face of the driven gear, and a protrusion is provided on the base that can move between the notch, the guide slope and the rear end face of the driven gear, and the protrusion can push the driven gear to move axially when passing through the guide slope.

[0009] The notch is arranged on 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 guide slope 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 spacing with the driven gear. When the protrusion moves along the guide slope, it will be guided to move upward or downward relatively, thereby pushing the driven gear to move axially, achieving the effect of driving axial translation through the rotation of the driven gear, and this displacement distance is limited, which can be adjusted by changing the notch depth 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 achieves axial movement through rotation.

[0010] In the above-mentioned thread trimming device, the protrusion is provided with a roller capable of sliding contact or rolling contact with the notch, the guide ramp and the driven gear.

[0011] The protrusion is specifically in the form of a roller, and its circular shape is conducive to fitting with the guide slope. At the same time, the roller and the base are fixedly connected or rotatably connected, and the rotatable connection is preferred. The rolling contact between the roller and each contact surface can reduce resistance, reduce wear and increase service life.

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

[0013] An annular sleeve is provided at the front end of the driven gear to form a cam gear structure. The first arc-shaped hole extends circumferentially along the annular sleeve, and its width is adapted to the outer diameter of the first guide column, thereby realizing the axial extension and contraction synchronization of the driven gear and the internal rotary cutter. At the same time, its arc-shaped long strip shape causes a certain clutch space to exist between the first guide column and the first arc-shaped hole, that is, when the driven gear is rotated for telescopic drive, the first guide column slides in the first arc-shaped hole, and at this time, there is no rotation synchronization between the driven gear and the internal rotary cutter. After being extended and retracted into place, the first guide column rotates to be in contact with one end of the first arc-shaped hole, and at this time, the driven gear and the internal rotary cutter enter a rotation synchronization state, thereby realizing effective shearing and controlling the driving force cost.

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

[0015] The outer diameter of the second guide column is adapted to the width of the second arc hole to ensure axial synchronization. At the same time, the second arc hole is also in the shape of an arc strip, that is, the second guide column can move relatively circumferentially in the second arc hole, and has a certain clearance space, thereby ensuring the rotation of the inner rotary cutter relative to the outer rotary cutter. At the same time, by adjusting the length of the clearance space, the maximum rotation angle of the inner rotary cutter can be limited.

[0016] As an optimization, the inner rotary cutter is in the shape of a circular tube, and two groups of guide post mounting holes are radially penetrated therethrough. The main sections of the first guide post and the second guide post are located inside the inner rotary cutter, and the inner ends are plugged or screwed into one of the guide post mounting holes, and the outer ends are penetrated through another guide post mounting hole to be exposed outward. The first guide post and the second guide post are inserted into the corresponding rotary cutter 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 is not exposed to avoid frictional contact with the inner wall of the outer rotary cutter or the inner wall of the annular sleeve, and one end is exposed to enter the corresponding arc hole to ensure the corresponding limiting effect.

[0017] In the above-mentioned wire cutting device, a circumferential reset component is provided between the inner rotary cutter and the outer rotary cutter, which can drive the inner rotary cutter to return circumferentially when the rotary shearing is completed; an axial reset component 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.

[0018] The circumferential reset assembly and the axial reset assembly enable the thread trimmer to automatically reset to an initial state after completing the shearing action, thereby improving work efficiency and operational convenience and ensuring that the thread trimmer works continuously and stably.

[0019] In the above-mentioned thread trimming device, the circumferential reset assembly includes a reset torsion spring sleeved on the external rotary cutter, one end of the reset torsion spring is arranged on the second guide column, and the other end is arranged on the outer wall of the external rotary cutter;

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

[0021] The reset torsion spring is sleeved on the external rotary cutter, exerting an elastic force on the second guide column to rotate toward one end of the second arc hole, so that the internal rotary cutter has a tendency to rotate to an initial state. The two ends of the reset tension spring are respectively connected to the base and the internal rotary cutter, so that the internal rotary cutter has a tendency to retract toward the rear end.

[0022] As a specific optimization, one end of the reset tension spring is fixed to the tension spring fixing seat of the base, and the other end is fixed to the tension spring column in the inner hole of the inner rotary cutter. The rear end of the base is connected to the outside through the mounting port, and the mounting port is embedded with a mounting seat. The flange of the mounting 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 mounting seat. The outer end of the mounting seat is detachably fixed with a tension spring fixing seat, and the inner end of the tension spring fixing seat is provided with a hooking rod, and one end of the reset tension spring is hooked with the hooking rod. The outer end of the mounting seat is provided with a through hole connected to the tension spring fixing seat, and the tension spring fixing seat is detachably arranged, which is convenient for disassembly and assembly, and convenient for replacement of the reset tension spring.

[0023] In the above-mentioned wire cutting device, the outward-rotating cutter includes an outward-rotating cutter rod and an outward-rotating cutter head, the outward-rotating cutter rod and the outward-rotating cutter head are connected as a whole, the width of the outward-rotating cutter head gradually decreases from the inner end to the outer end, and the cross-section of the outward-rotating cutter head is arc-shaped; the inward-rotating cutter includes an inward-rotating cutter rod and an inward-rotating cutter head, the inward-rotating cutter rod and the inward-rotating cutter head are connected as a whole, the width of the inward-rotating cutter head gradually decreases from the inner end to the outer end, and the cross-section of the inward-rotating cutter head is arc-shaped; the outward-rotating cutter head is provided with a knife surface on the side opposite to the inward-rotating cutter head.

[0024] The external rotating blade rod is the main part of the external rotating cutter, which is connected to the external rotating blade head. The external rotating blade rod is tubular and has an inner hole running through it. The inner rotating blade rod is similar to the external rotating blade rod, which is connected to the inner rotating blade head and the driven gear. The inner rotating blade rod is in the shape of a circular tube, and its outer diameter is adapted to the inner diameter of the inner hole. The inner rotating blade rod is rotatably inserted into the external rotating blade rod. The external rotating blade head and the inner rotating blade head are the key parts for performing the shearing action. Their width gradually decreases from the inner end to the outer end, so that the blade head can gradually cut in 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 blade head is arc-shaped, which is conducive to dispersing the shearing force, reducing the wear of the blade head, and increasing the contact area with the wire, thereby 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 cutter mounting hole, a D-shaped shaft hole is opened on the telescopic positioning seat, the external rotary cutter rod of the external rotary cutter is adaptively connected with the D-shaped shaft hole in a circumferential limit and axially movable manner, and the telescopic positioning seat is fixed on the base; the external rotary cutter, internal rotary cutter, rotary cutter mounting hole and D-shaped shaft hole are coaxially arranged.

[0026] The telescopic positioning seat is embedded in the rotary cutter mounting hole, and its flange part is fixed to the front end of the base by bolts, which has flexible detachability. A D-shaped shaft hole is provided on the telescopic positioning seat, and the shape of the hole is similar to the D shape. A plane is provided on the external rotary cutter rod of the external rotary cutter along the axial direction to form a D shape, ensuring that it is connected to the D-shaped shaft hole in an adaptive shape, thereby ensuring the stability of the external rotary cutter in the circumferential direction and allowing it to make necessary movements in the axial direction. The external rotary cutter, the internal rotary cutter, the rotary cutter mounting hole and the D-shaped shaft hole are coaxially arranged to eliminate deviations and errors caused by different axes, so that the internal rotary cutter and the external rotary cutter 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 drive mechanism includes a reduction motor fixed on a motor mounting part of a base, a driving gear meshing with a driven gear is rotatably connected to 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 drive mechanism consists of a motor mounting part fixed on a 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, and the driving gear rotates in the motor mounting part through the rotating shaft. The driving gear is meshed 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. The reduction motor has the advantages of stable power output, convenient speed regulation, and high control accuracy, and is suitable for scenes that require precise control of shearing speed and shearing force.

[0029] In the above-mentioned thread trimming device, as a second feasible solution, the gear rotation driving mechanism includes a rack meshingly connected to the driven gear, the rack is arranged on the rack seat, and the rack is connected to the linear drive.

[0030] In this solution, the gear rotation drive mechanism includes a rack seat, a linear drive 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 drive, thereby driving the meshing driven gear to rotate. The linear drive can use an end-mounted standard cylinder with 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 drive mechanism includes a piston cylinder body, a piston is arranged in the piston cylinder body, a rack structure is arranged on the piston, the driven gear passes through the gear through hole of the side wall of the piston cylinder body and is meshed and connected with the rack structure, a piston driving chamber is arranged between at least one end of the piston and the piston cylinder body, and a connecting port connected to the piston driving chamber is arranged at the end of the piston cylinder body, and the connecting port corresponds to the piston driving chamber one by one.

[0032] In this solution, the gear rotation drive mechanism is composed of a piston cylinder body, a piston, and a rack structure arranged on a base. The piston cylinder body is laterally fixed above the base, and a piston is provided therein. A piston driving chamber is formed between the piston heads at both ends of the piston and the two inner end surfaces of the piston cylinder body. The piston driving chamber is connected to the hydraulic component through a connecting port, and the axial movement drive of the piston is realized by controlling the inlet and outlet of the hydraulic component, thereby realizing the effect of driving the driven gear meshing with the rack structure on the piston to rotate.

[0033] Furthermore, a piston channel is axially provided inside the piston cylinder body, and both ends of the piston channel are closed by end covers, which are fixed to the piston cylinder body in a detachable manner, wherein the piston main body is in the shape of a long rod, and piston heads are provided at both ends of the piston, and a sealing ring structure is provided between the piston head and the inner wall of the piston channel to form a circumferential seal, and the above-mentioned piston drive chamber is formed between the piston head and the end covers, and the middle part of the piston cylinder body is laterally fixed to the top of the base, and a gear through hole is provided on the lower side of the middle part for docking and matching between the driven gear and the rack structure on the piston, and the rack structure is specifically a plurality of teeth evenly distributed axially on the lower side of the piston, and the gear through hole is always located between the two piston heads and will not be connected with the piston drive chamber to ensure stable drive, and a hydraulic component is connected to the connecting port, and the hydraulic component realizes the effect of controlling the axial movement of the piston by supplying or discharging working medium into the piston drive chamber. This is a prior art and will not be further elaborated.

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

[0035] 1. The wire cutting device of the present invention realizes efficient and accurate wire harness cutting through rotary cutting and axial movement.

[0036] 2. The notch is set on the rear end of the driven gear. When the protrusion moves along the guide slope, 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, and this displacement distance is limited and can be adjusted by changing the notch depth according to actual needs.

[0037] 3. An annular sleeve is provided at the front end of the driven gear to form a cam gear structure. The arc-shaped strip shape of the first arc-shaped hole allows a certain clutch space to exist between the first guide column and the first arc-shaped hole, thereby controlling the driving force cost.

[0038] 4. The second arc hole is in the shape of an arc strip, and the second guide column can move relatively circumferentially in the second arc hole, with a certain clearance space, thereby ensuring the rotation of the inner rotary cutter relative to the outer rotary cutter. At the same time, by adjusting the length of the clearance space, the maximum rotation angle of the inner rotary cutter can be limited.

[0039] 5. The circumferential reset assembly and the axial reset assembly enable the thread trimmer to automatically reset to its initial state after completing the shearing action, thereby improving work efficiency and convenience of operation and ensuring that the thread trimmer works continuously and stably.

[0040] 6. The inner rotating blade is rotatably inserted into the outer rotating blade. The outer rotating blade head and the inner rotating blade head are the key parts for performing the shearing action. The width thereof gradually decreases from the inner end to the outer end, so that the blade head can 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 blade head is arc-shaped, which is conducive to dispersing the shearing force, reducing the wear of the blade head, and increasing the contact area with the wire, thereby improving the shearing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic diagram of the overall structure provided by the present invention (Example 1);

[0042] Figure 2 is a cross-sectional schematic diagram provided by the present invention (Example 1);

[0043] Figure 3 Schematic diagram of the internal structure provided by the present invention (Example 1);

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

[0045] Figure 5 It is a schematic structural diagram of the external rotary cutter provided by the present invention;

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

[0047] Figure 7 Schematic diagram of the overall structure provided by the present invention (Example 2);

[0048] Figure 8 is a cross-sectional schematic diagram provided by the present invention (Example 2);

[0049] Fig. 9 Schematic diagram of the overall structure provided by the present invention (Example 3);

[0050] Fig.10 It is a cross-sectional schematic diagram provided by the present invention (Example 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 rotary cutter head 21, external rotary cutter rod 22, second arc hole 23, internal rotary cutter 3, internal rotary cutter head 31, internal rotary cutter rod 32, first guide column 33, second guide column 34, tension spring column 35, driven gear 4, notch 41, guide slope 42, annular sleeve 43, first arc hole 44, first Limiting mechanism 51, limited reversing 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 drive 65, rack 66, piston cylinder 67, piston 68, gear through hole 69, rack structure 70, piston drive chamber 71, connecting 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. DETAILED DESCRIPTION

[0052] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0053] Example 1

[0054] Specific implementation examples Figure 1-6As shown, the thread cutting device comprises a base 1, a rotary cutter mounting hole 11 is provided on the base 1, an outer rotary cutter 2 is provided in the rotary cutter mounting hole 11 and is connected to the rotary cutter 2 for circumferential limit and axial movement, an inner rotary cutter 3 is passed through the outer rotary cutter 2 and is connected to the outer side, and the rear end of the inner rotary cutter 3 is passed through the outer rotary cutter 2 and the rear end of the inner rotary cutter 3 extends to the outside, an outer rotary cutter head 21 and an inner rotary cutter head 31 are respectively provided on the outer ends of the outer rotary cutter 2 and the inner rotary cutter 3, and 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 The inner rotary cutter 3 is connected to the outer rotary cutter 2, and a first limiting mechanism 51 is provided between the inner rotary cutter 3 and the driven gear 4, which can make the driven gear 4 axially positioned relative to the inner rotary cutter 3 and limitedly rotate circumferentially; a limited reversing mechanism 52 is provided between the driven gear 4 and the base 1, which can drive the inner rotary cutter 3 to move outward axially when the driven gear 4 rotates; a second limiting mechanism 53 is provided between the inner rotary cutter 3 and the outer rotary cutter 2, which can make the inner rotary cutter 3 axially positioned relative to the outer rotary cutter 2 and limitedly rotate circumferentially.

[0055] Specifically, the wire cutting device of the present invention realizes efficient and accurate wire harness cutting through rotary cutting and axial movement, wherein the base 1 is the support and foundation of the entire device, providing a stable installation platform for other components, the rotary cutter mounting hole 11 is located on the base 1, and is used to install the outer rotary cutter 2, ensuring that it can stably move axially during operation while limiting rotation, the inner rotary cutter 3 is rotatably arranged in the outer rotary cutter 2, and the relative rotation with the outer rotary cutter 2 can be realized by driving the inner rotary cutter 3 to rotate, and the rotation angle of the inner rotary cutter 3 is 80-90 degrees, and the outer rotary cutter head 21 and the inner rotary cutter head 31 at the outer end of the rotary cutter rotate relative to each other to realize the shearing action in a closing manner, and the inner rotary cutter 3 is driven to rotate. The rear end of the cutter 3 passes through the rear end of the external rotary cutter 2 and extends to the outside, so as to be conveniently connected to 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 synchronous rotation of the internal rotary cutter 3 and the driven gear 4 within a certain rotation range. The limited reversing mechanism 52 is used to drive the internal rotary cutter 3 to move axially outward to a certain extent through the rotation of the driven gear 4. The second limiting mechanism 53 is used to ensure the axial positioning of the internal rotary cutter 3 and the external rotary cutter 2, so that the external rotary cutter head 21 and the internal rotary cutter head 31 can be synchronously extended and retracted to cut the wire harness to the corresponding depth, but at the same time, it can rotate circumferentially to a limited extent, which can give way to the rotation of the internal rotary cutter 3 and can also be used to limit the rotation angle.

[0056] like Figure 2 , 3As shown in Figures 4 and 5, the limited reversing mechanism 52 includes a notch 41 disposed on the rear end of the driven gear 4, a guide ramp 42 is disposed between one side of the notch 41 and the rear end face of the driven gear 4, a protrusion 12 is disposed on the base 1 and can move between the notch 41, the guide ramp 42 and the rear end face of the driven gear 4, and the protrusion 12 can push the driven gear 4 to move axially when passing through the guide ramp 42. A roller 13 is disposed on the protrusion 12 and can roll in contact with the notch 41, the guide ramp 42 and the driven gear 4.

[0057] Specifically, the notch 41 is arranged on 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 guide ramp 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 protrusion 12 to move and changing its axial spacing with the driven gear 4. When the protrusion 12 moves along the guide ramp 42, it will be guided to move upward or downward relatively, thereby pushing the driven gear 4 to move axially, realizing the effect of driving the axial translation through the rotation of the driven gear 4, and this displacement distance is limited, which 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 the fit with the guide ramp 42. At the same time, the roller 13 is connected to the base 1 in a fixed rotation, and the rolling contact can reduce resistance, reduce wear, and increase service life.

[0058] like Figure 3 , 4 As shown in Figures 5 and 6, the first limiting mechanism 51 includes 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 is arranged in the first arc-shaped hole 44, and the inner end of the first guide column 33 is fixed to the inner rotary cutter 3. The second limiting mechanism 53 includes a second arc-shaped hole 23 arranged along the circumferential direction on the outer 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 to the inner rotary cutter 3.

[0059] Specifically, an annular sleeve 43 is provided at the front end of the driven gear 4 to form a cam gear structure. The first arc-shaped hole 44 extends circumferentially along the annular sleeve 43, and its width is adapted to the outer diameter of the first guide column 33, thereby realizing the axial extension and contraction synchronization of the driven gear 4 and the internal rotary cutter 3. At the same time, its arc-shaped long strip shape enables a certain clutch space to exist between the first guide column 33 and the first arc-shaped hole 44, that is, when the driven gear 4 is rotated for telescopic drive, the first guide column 33 slides in the first arc-shaped hole 44, and at this time, there is no rotational synchronization between the driven gear 4 and the internal rotary cutter 3. After being extended and retracted into place, the first guide column 33 rotates to be in contact with one end of the first arc-shaped hole 44, and at this time, the driven gear 4 and the internal rotary cutter 3 enter a rotational synchronization state, thereby realizing effective shearing and controlling the driving force cost. The outer diameter of the second guide column 34 is adapted to the width of the second arc hole 23 to ensure axial synchronization. At the same time, the second arc hole 23 is also in the shape of an arc strip, that is, the second guide column 34 can move relatively circumferentially in the second arc hole 23, and has a certain clearance space, which ensures the rotation of the inner rotary cutter 3 relative to the outer rotary cutter 2. At the same time, by adjusting the length of the clearance 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 in the inner rotary cutter 3, and the inner ends are plugged or screwed into one of the guide post mounting holes, and the outer ends are penetrated through another guide post mounting hole to be exposed outward. The first guide post 33 and the second guide post 34 are inserted into the corresponding rotary cutter 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 is not exposed to avoid frictional contact with the inner wall of the outer rotary cutter 2 or the inner wall of the annular sleeve 43, and one end is exposed to enter the corresponding arc hole to ensure the corresponding limiting effect.

[0061] like Figure 3 As shown, a circumferential reset component 9 is provided between the inner rotary cutter 3 and the outer rotary cutter 2, and can drive the inner rotary cutter 3 to return circumferentially when the rotary shearing of the inner rotary cutter 3 is completed. The circumferential reset component 9 includes a reset torsion spring 91 sleeved on the outer rotary cutter 2, and one end of the reset torsion spring 91 is arranged on the second guide column 34, and the other end is arranged on the outer wall of the outer rotary cutter 2; an axial reset component 8 is provided between the inner rotary cutter 3 and the base 1, and can drive the inner rotary cutter 3 to move axially inward after the circumferential reset of the inner rotary cutter 3, and the axial reset component 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 assembly 9 and the axial reset assembly 8 enable the thread trimmer to automatically reset to the initial state after completing the shearing action, thereby improving work efficiency and convenience of operation, and ensuring that the thread trimmer can work continuously and stably. The reset torsion spring 91 is sleeved on the external rotary cutter 2, and applies an elastic force to the second guide column 34 to rotate toward one end of the second arc-shaped hole 23, so that the internal 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 internal rotary cutter 3, so that the internal rotary cutter 3 has a tendency to retract toward the rear end.

[0063] Furthermore, one end of the reset tension spring 81 is fixed on the tension spring fixing seat 15 of the base 1, and the other end is fixed on the tension spring column 35 in the inner hole of the inner rotary cutter 3. In this embodiment, the inner end of the first guide column 33 penetrates the side wall of the inner rotary cutter 3 and enters the inner hole to serve as the tension spring column 35. The rear end of the base 1 is connected to the outside through the mounting port, and the mounting seat 14 is embedded on the mounting port. The flange of the mounting 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 mounting seat 14. The outer end of the mounting seat 14 is detachably fixed with the tension spring fixing seat 15. The inner end of the tension spring fixing seat 15 is provided with a hooking rod, and one end of the reset tension spring 81 is hooked with the hooking rod. The outer end of the mounting seat 14 is provided with a through hole connected to the tension spring fixing seat 15. The tension spring fixing seat 15 is detachably arranged, which is convenient for disassembly and assembly, and convenient for replacement of the reset tension spring 81.

[0064] like Figure 1 , 5 As shown in Figures 6, the outward-rotating cutter 2 includes an outward-rotating cutter rod 22 and an outward-rotating cutter head 21, which are connected as a whole, the width of the outward-rotating cutter head 21 gradually decreases from the inner end to the outer end, and the cross-section of the outward-rotating cutter head 21 is arc-shaped; the inward-rotating cutter 3 includes an inward-rotating cutter rod 32 and an inward-rotating cutter head 31, which are connected as a whole, the width of the inward-rotating cutter head 31 gradually decreases from the inner end to the outer end, and the cross-section of the inward-rotating cutter head 31 is arc-shaped; a knife surface is provided on the side opposite to the inward-rotating cutter head 31 and the outward-rotating cutter head 21. A telescopic positioning seat 16 is provided at the front end of the rotary cutter mounting hole 11, and a D-shaped shaft hole 17 is opened 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.

[0065] Specifically, the outward rotating blade 22 serves as the main part of the outward rotating cutter 2, and is connected to the outward rotating blade head 21. The outward rotating blade 22 is tubular, and an inner hole is provided inside. The inner rotating blade 32 is similar to the outward rotating blade 22, and is connected to the inner rotating blade head 31 and the driven gear 4. The inner rotating blade 32 is in the shape of a circular tube, and the outer diameter is adapted to the inner diameter of the inner hole. The inner rotating blade 32 is rotatably inserted into the outward rotating blade 22. The outward rotating blade head 21 and the inner rotating blade head 31 are the key parts for performing the shearing action, and their width gradually decreases from the inner end to the outer end, so that the blade head can gradually cut in 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 blade head is arc-shaped, which is conducive to dispersing the shearing force, reducing the wear of the blade head, and increasing the contact area with the wire, thereby improving the shearing efficiency. The telescopic positioning seat 16 is arranged on the rotary cutter mounting hole 11, and its flange portion is fixed to the front end of the base 1 by bolts, which has flexible detachability. A D-shaped shaft hole 17 is provided on the telescopic positioning seat 16, and the shape of the hole is similar to the D shape. A plane is provided on the external rotary cutter rod 22 of the external rotary cutter 2 along the axial direction to form a D shape, ensuring that it is connected to the D-shaped shaft hole 17 in an adaptive manner, ensuring the stability of the external rotary cutter 2 in the circumferential direction, and allowing it to make necessary movements in the axial direction. 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 to eliminate deviations and errors caused by different axes, so that the internal rotary cutter 3 and the external rotary cutter 2 maintain a high degree of consistency and accuracy during relative rotation and telescopic movement.

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

[0067] Specifically, the gear rotation drive mechanism 6 is composed of a motor mounting part 61 fixed on the base 1, a reduction motor 62, a rotating shaft, a driving gear 63 and a driven gear 4. The output end of the reduction motor 62 is connected to the driving gear 63, and the driving gear 63 rotates in the motor mounting part 61 through the rotating shaft. The driving gear 63 is meshed 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 external rotary cutter 2 and the internal rotary cutter 3 to perform rotary shearing. The reduction motor 62 has the advantages of stable power output, convenient speed regulation, and high control accuracy, and is suitable for scenes that require precise control of 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 column 33 is attached to the left end of the first arc hole 44, the second guide column 34 is attached to the right end of the second arc hole 23, and the inner rotating cutter head 31 and the outer rotating cutter head 21 are separated. When it is necessary to extend the shear, the reduction motor 62 is activated, the driven gear 4 rotates, the roller 13 climbs up the guide slope 42, the inner rotating cutter 3 and the outer rotating cutter 2 extend, and the first guide column 33 rotates to the right end in the first arc hole 44. After the roller 13 rolls to the rear end face of the driven gear 4, the first guide column 33 is attached to the right end of the first arc hole 44, and begins to push the inner rotating cutter 3 to rotate. At the same time, the second guide column 34 begins to rotate in the second arc hole 23, and the outer rotating cutter head 21 and the inner rotating cutter head 31 rotate relative to each other to close and shear the wire harness. After the shearing is completed, the reduction motor 62 moves 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 as the driven gear 4 rotates.

[0069] Example 2

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

[0071] Specific implementation examples Figure 7 , 8 As shown, the gear rotation driving mechanism 6 includes a rack 66 meshingly connected to the driven gear 4 , the rack 66 is arranged on a rack seat 64 , and the rack 66 is connected to a linear drive 65 .

[0072] Specifically, the gear rotation drive mechanism 6 includes a rack seat 64, a linear drive 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 action of the output end of the linear drive 65, thereby driving the meshing driven gear 4 to rotate. The linear drive 65 uses an end-mounted standard cylinder with a simple structure and low cost, and is suitable for scenarios with certain cost requirements.

[0073] Example 3

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

[0075] Specific implementation examples Fig. 9 , 10As shown, the gear rotation drive mechanism 6 includes a piston cylinder 67, a piston 68 is arranged inside the piston cylinder 67, a rack structure 70 is arranged on the piston 68, the driven gear 4 passes through a gear through hole 69 on the side wall of the piston cylinder 67 and is meshed and connected with the rack structure 70, a piston driving chamber 71 is arranged between both ends 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.

[0076] Specifically, the gear rotation drive mechanism 6 is composed of a piston cylinder 67, a piston 68, and a rack structure 70 arranged on the base 1. The piston cylinder 67 is transversely fixed above the base 1, and a piston 68 is provided therein. A piston driving chamber 71 is formed between the piston heads at both ends of the piston 68 and the two inner end surfaces of the piston cylinder 67. The piston driving chamber 71 is connected to the corresponding hydraulic component through a connecting port 72. The axial movement drive of the piston 68 is achieved by controlling the inlet and outlet of the hydraulic component, thereby achieving the effect of driving the driven gear 4 meshing with the rack structure 70 to rotate. Two sets of connecting ports 72 and piston driving chambers 71 are provided, and driving is achieved through alternating actions, which can achieve a greater driving force.

[0077] Furthermore, a piston passage is axially penetrated inside the piston cylinder 67, and both ends of the piston passage are closed by end covers 73. The end covers 73 are detachably fixed to the piston cylinder 67, wherein the main body of the piston 68 is in the shape of a long rod, and piston heads are provided at both ends of the piston 68. A sealing ring structure 74 is provided between the piston head and the inner wall of the piston passage to form a circumferential seal, and a piston driving chamber 71 is formed between the piston head and the end covers 73. The middle part of the piston cylinder 67 is transversely fixed to the top of the base 1, and a gear through hole 69 is penetrated on the lower side of the middle part for docking and matching between the driven gear 4 and the rack structure 70 on the piston 68. The rack structure 70 is specifically a plurality of teeth uniformly 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 be connected to the piston driving chamber 71 to ensure stable driving. A hydraulic component is connected to the connecting port 72, and the hydraulic component achieves 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 examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they 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), It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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 cutting device according to claim 1, 2 or 3, It is 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, It is 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 cutting device according to claim 1, 2 or 3, It is 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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