Automatic knife sharpening mechanical knife cutting bed based on sensing detection

Abstract

The invention discloses an automatic knife sharpening mechanical knife cutting bed based on sensing detection, and relates to the technical field of cloth cutting. Comprising a rack, a first support slidably connected with the rack in the first direction and a second support slidably connected with the first support in the second direction, and a cutter and a cutter transmission mechanism driving the cutter to move are arranged on the second support; a knife sharpening mechanism is arranged on the second support and comprises a knife sharpening wheel set; the feeding mechanism is used for driving the sharpening wheel set to move towards or away from the cutter; in the two adjacent feeding processes, the stroke of the next feeding is larger than the stroke of the previous feeding; and the reciprocating driving mechanism is used for driving the cutter sharpening wheel set to circularly reciprocate in the length direction of the cutting edge of the cutter. According to the cutter grinding device, the cutter can be automatically ground under the condition that the cutter does not need to be disassembled.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application is a divisional application based on the Chinese patent application with application number 202310916805X, application date: July 25, 2023, and invention name: "A mechanical knife cutting bed with automatic knife sharpening". Technical Field

[0002] The invention relates to the technical field of cloth cutting, in particular to a mechanical knife cutting bed with automatic knife sharpening. Background Art

[0003] With the advancement of mechanization, most industries are moving towards mechanization and automation. Mechanization and automation have also been achieved in the field of cloth cutting. Most of the existing cloth cutting machines use cloth cutting machines.

[0004] However, there are still many problems with the existing cutting tables during actual use, such as: 1. Due to the high degree of automation of the cutting table and the large amount of cloth cut per unit time, the cutting blade on the cutting table is seriously worn. After the blade is worn, the quality of cloth cutting will be reduced or even scrapped. Therefore, it is necessary to grind the cutting blade of the cutting table in time. The existing technology mainly adopts manual grinding, and the grinding effect depends entirely on manual control and is uneven.

[0005] 2. The movement of the cutter is usually achieved by a crank mechanism. However, during actual use, technicians found that due to the influence of processing accuracy, the crank mechanism not only drives the cutter to move along the direction of the cutter blade, but also causes vibration in the thickness direction of the blade. This results in uneven cuts in the fabric during the cutting process. Summary of the invention

[0006] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a mechanical knife cutting bed with automatic knife sharpening, which can realize automatic grinding of the cutting knife and achieve uniform and stable grinding effect.

[0007] To achieve the above object, the present invention provides the following technical solutions: A mechanical knife cutting machine with automatic knife sharpening comprises a frame, a first bracket connected to the frame in a sliding manner along a first direction, and a second bracket connected to the first bracket in a sliding manner along a second direction, wherein a knife and a knife transmission mechanism for driving the knife are arranged on the second bracket; a knife sharpening mechanism is arranged on the second bracket, and the knife sharpening mechanism comprises: Sharpening wheel set; The feeding mechanism is used to drive the grinding wheel group to move toward or away from the cutting knife; in two consecutive feeding processes, the stroke of the latter feeding is greater than the stroke of the previous feeding; The reciprocating drive mechanism is used to drive the sharpening wheel assembly to perform cyclic reciprocating motion along the length direction of the cutting blade of the cutter.

[0008] In certain embodiments of the present invention, the grinding wheel group includes two grinding wheels staggered in the length direction of the blade of the cutter, and the two grinding wheels partially overlap to form a grinding opening for the blade of the cutter to enter. When the feeding mechanism drives the grinding wheel group to move toward the cutter, the blade of the cutter enters the grinding opening, and the two sides of the blade respectively abut against the grinding wheels on both sides of the grinding opening.

[0009] In some embodiments of the present invention, the two grinding wheels rotate in opposite directions at the grinding edges.

[0010] In certain embodiments of the present invention, the feeding mechanism includes a lead screw and a slider that is relatively fixed to the grinding wheel assembly in the feeding direction, the lead screw is rotatably disposed on the second bracket, and the slider is threadably engaged with the lead screw.

[0011] In certain embodiments of the present invention, the feed mechanism is provided with a sensor and a controller for detecting the feed stroke of the grinding wheel group; in two adjacent feeding processes, the sensor detects the first stroke of the previous feeding and transmits it to the controller, the controller adds a fixed value on the basis of the first stroke to obtain the second stroke, and in the next feeding process, controls the feed mechanism to drive the grinding wheel group to feed the second stroke.

[0012] In certain embodiments of the present invention, the reciprocating drive mechanism includes a rotating wheel and a protrusion that is relatively fixed to the sharpening wheel group along the length direction of the cutter blade; a track with a height difference along the length direction of the cutter blade is provided on the outer periphery of the rotating wheel, and the protrusion slides in cooperation with the track.

[0013] In certain embodiments of the present invention, the second bracket includes a rear bracket and a front bracket that can slide relative to each other along the length direction of the cutter blade, the rear bracket is slidably connected to the first bracket along the second direction, and the front bracket is provided with a cutter and a cutter transmission mechanism that drives the cutter to move; during the sharpening process, the front bracket slides relative to the rear bracket.

[0014] In some embodiments of the present invention, the cutter transmission mechanism comprises: Tool bar assembly; A knife clamp is used to clamp the cutting knife, and the knife clamp is arranged at the first end of the knife rod; A knife bar fixing seat, slidingly matched with the knife bar assembly; The crank mechanism is used to drive the knife bar assembly to slide relative to the knife bar fixing seat. The crank mechanism includes a plurality of crank connecting rods that are connected in sequence end to end rotation. The end crank connecting rod is connected to the second end of the knife bar assembly. The swing mechanism comprises a swing groove, a swing connecting rod and a swing seat; the middle part of the swing connecting rod is rotatably connected to one of the plurality of crank connecting rods; the first end of the swing connecting rod is rotatably connected to the swing seat, and the second end is slidably matched with the swing groove; during the swinging process of the crank connecting rod, the second end of the swing connecting rod swings along the swing groove.

[0015] In certain embodiments of the present invention, the crank mechanism includes a first crank connecting rod and a second crank connecting rod driven by a rotating cam, and the second crank connecting rod is connected to the second end of the knife rod assembly; the middle part of the swing connecting rod is rotationally connected to the middle part of the second crank connecting rod.

[0016] In certain embodiments of the present invention, the knife bar assembly includes a movable connection joint and a knife bar; the movable connection joint is rotationally connected to a crank connecting rod at the end, and the knife bar is rotationally connected to the movable connection joint along its axial direction.

[0017] In certain embodiments of the present invention, the tool rod assembly further comprises a tool sleeve, wherein the tool sleeve is disposed between the tool rod and the tool rod fixing seat, the tool sleeve is rotationally connected to the tool rod via a bearing, and the tool sleeve is slidingly matched with the tool rod fixing seat.

[0018] In some embodiments of the present invention, a knife clamping assembly is further included. The knife clamping assembly includes a synchronous wheel group and a first knife clamping block arranged on the synchronous wheel group. The first knife clamping block is provided with a knife clamping groove that slidably cooperates with the cutting knife.

[0019] In certain embodiments of the present invention, the knife clamping assembly further comprises a plurality of knife clamping wheels fitted with the cutting knife surface.

[0020] In some embodiments of the present invention, the knife clamping wheel includes side knife clamping wheels respectively attached to both sides of the blade body of the cutter and a blade clamping wheel attached to one side of the blade of the cutter.

[0021] In some embodiments of the present invention, one of the knife clamping wheel and the knife clamping groove is located in the middle of the cutter, and the other is located in the lower part of the cutter.

[0022] A double gear backlash adjustment mechanism, comprising A guide rail, on which a slider is slidably fitted; A rack, arranged parallel to the guide rail; A connecting plate, fixedly connected to the slider; The pulley assembly comprises two first pulleys rotatably arranged on a connecting plate, at least one second pulley, and belts sleeved on the outsides of the first pulleys and the second pulleys; each first pulley is rotatably arranged with a coaxial gear, and the two gears are respectively meshed with the rack; the gears are fixedly connected with a gear shaft, and the gear shaft is rotatably connected with the first pulley; The locking mechanism is used to lock the first pulley and the gear so that the two rotate synchronously.

[0023] In some embodiments of the present invention, a tensioning mechanism is further included, wherein the tensioning mechanism includes a pressure wheel abutting against the belt, and a contact mechanism for maintaining the pressure wheel and the belt in a state of abutting against each other.

[0024] In certain embodiments of the present invention, the top contact mechanism includes a mounting base fixedly mounted on the connecting plate, a sliding rod is slidably connected to the mounting base, the first end of the sliding rod is connected to a wheel seat for mounting a pressure wheel, and the outer sleeve of the sliding rod is provided with an elastic member for providing elastic force for the pressure wheel toward one side of the belt.

[0025] In certain embodiments of the present invention, the elastic member includes a first spring and a second spring, and the first spring and the second spring are both compression springs, which are respectively sleeved on the outside of the slide rod at both sides of the wheel seat.

[0026] In some embodiments of the present invention, the second end of the slide rod is threadedly fitted with an adjusting nut, and the adjusting nut abuts against a second spring located on the same side of the wheel seat.

[0027] In some embodiments of the present invention, the mounting seat is provided with a waist-shaped hole and a bolt, and the bolt passes through the waist-shaped hole and is threadedly connected to the connecting plate.

[0028] In some embodiments of the present invention, the locking mechanism comprises a clamping sleeve, and the clamping sleeve is arranged between the first pulley and the gear shaft.

[0029] In certain embodiments of the present invention, a rotating assembly is provided between the gear shaft and the connecting plate, and the rotating assembly includes a rotating seat fixedly mounted on the connecting plate, and the rotating seat is rotatably connected to the gear shaft via a plurality of bearings.

[0030] In some embodiments of the present invention, a motor for driving the second pulley to rotate is also provided on the connecting plate.

[0031] A double gear transmission zero backlash adjustment method, using the double gear backlash adjustment mechanism as described above, comprises the following steps: S1, setting the first pulley and the gear to a relative rotation state; S2, initially pressing the belt between the two first pulleys to make the belt tension reach a first tension value; S3, adjusting the two gears to rotate in opposite directions until the torque of the gears reaches a first torque value, switching the first pulley and the gears to a synchronous locking state; S4, pressing the belt again at a position between the two first pulleys so that the tension of the belt reaches a second tension value.

[0032] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes the movement of the grinding wheel group toward or away from the cutter through the feeding mechanism, which can form automatic grinding of the cutter, and the grinding effect is uniform and stable.

[0033] 2. The present invention controls the stroke of the subsequent feeding to be greater than the stroke of the previous feeding, thereby ensuring that the cutter can be effectively ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 Schematic diagram of the second bracket of the present invention.

[0036] Figure 3 It is a schematic diagram of the cutter transmission mechanism of the present invention.

[0037] Figure 4 It is a schematic diagram of the swing mechanism in the first state of the present invention.

[0038] Figure 5 It is a schematic diagram of the swing mechanism in the second state of the present invention.

[0039] Figure 6 It is a side view of the present invention.

[0040] Figure 7 for Figure 6 AA section view.

[0041] Figure 8 for Figure 7 A partial enlarged view of point B.

[0042] Fig. 9 Schematic diagram of the cutter transmission mechanism from another perspective of the present invention.

[0043] Fig.10 for Fig. 9 A partial enlarged view of point C in the middle.

[0044] Fig.11 It is a schematic diagram of a knife sharpening mechanism of the present invention.

[0045] Fig.12 It is a schematic diagram of a sharpening wheel assembly of the present invention.

[0046] Fig.13 It is a schematic diagram of the overlap of two grinding wheels of the present invention.

[0047] Fig.14 It is a schematic diagram of the feeding mechanism of the present invention.

[0048] Fig.15 It is a schematic diagram of the reciprocating drive mechanism of the present invention.

[0049] Fig.16 It is a schematic diagram of shelling of the sharpening wheel assembly of the present invention.

[0050] Fig.17 It is an overall schematic diagram of the double-gear backlash adjustment mechanism of the present invention.

[0051] Fig.18 It is a front schematic diagram of the double-gear backlash adjustment mechanism of the present invention.

[0052] Fig.19 It is a schematic diagram of the cooperation between the gear and the rack of the present invention.

[0053] Fig. 20 It is a schematic diagram of the tensioning mechanism of the present invention.

[0054] Fig.21 It is a partial cross-sectional view of the connection between the first pulley and the rack of the present invention.

[0055] Fig. 22 It is an exploded view of the connection between the first pulley and the rack of the present invention.

[0056] In the figure: K1, frame; k2, first bracket; k3, second bracket; k31, front bracket; k32, rear bracket; 2. Cutting knife transmission mechanism; 210, knife bar assembly; 211, movable connection joint; 212, knife bar; 213, knife sleeve; 214, bearing; 220, knife holder; 230, knife bar fixing seat; 240, crank mechanism; 241, rotating cam; 242, first crank connecting rod; 243, second crank connecting rod; 250, swing mechanism; 251, swing connecting rod; 252, swing seat; 253, swing slot; 260, knife clamping assembly; 261, synchronous wheel set; 262, first knife clamping block; 263, knife clamping groove; 264, blade knife clamping wheel; 265, side knife clamping wheel.

[0057] 3. Knife sharpening mechanism; 310, grinding wheel assembly; 311, first housing; 312, grinding wheel; 313, grinding edge; 314, concave ring; 315, flange; 316, bevel gear assembly; 317, sliding mechanism; 320, feeding mechanism; 321, mounting bracket; 322, lead screw; 323, slider; 324, sensor; 330, reciprocating drive mechanism; 331, rotating wheel; 332, track; 333, bump; 4. Cutting knife; 5. Double gear backlash adjustment mechanism; 510, guide rail; 511, slider; 520, rack; 530, connecting plate; 540, pulley assembly; 541, first pulley; 542, second pulley; 543, belt; 544, gear; 545, gear shaft; 546, locking mechanism; 547, rotating seat; 548, bearing; 550, tensioning mechanism; 551, pressure wheel; 552, mounting seat; 553, sliding rod; 554, wheel seat; 555, first spring; 556, second spring; 557, adjusting nut; 558, waist-shaped hole. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Embodiment 1: See also Figure 1 and Figure 2 The present embodiment provides a mechanical knife cutting machine with automatic knife sharpening, comprising a frame k1, a first bracket k2 slidably connected to the frame k1 along a first direction, and a second bracket k3 slidably connected to the first bracket k2 along a second direction, wherein a cutter 4 and a cutter transmission mechanism 2 for driving the cutter 4 to move are arranged on the second bracket k3.

[0060] The sliding connection among the frame k1, the first bracket k2 and the second bracket k3 can realize the horizontal movement of the cutter. It is only necessary to set the sliding course among the frame k1, the first bracket k2 and the second bracket k3 according to the trajectory of fabric cutting.

[0061] In this embodiment, a knife sharpening mechanism 3 is provided on the second bracket k2 to realize online automatic sharpening of the cutting knife.

[0062] For details, please refer to Fig.11 The sharpening mechanism 3 comprises a sharpening wheel set 310, a feeding mechanism 320 and a reciprocating drive mechanism 330. The following are the three parts respectively: The sharpening wheel set 310 is used to sharpen the cutting knife. Fig.12 and Fig.16 The grinding wheel assembly 310 includes a first shell 311 and two grinding wheels 312 rotatably disposed on the first shell 311 .

[0063] The two grinding wheels 312 are staggered in the length direction of the cutting blade. Fig.13 As shown, the two grinding wheels 312 partially overlap in the rotation plane to form a grinding opening 313 for the blade of the cutter 4 to enter. Specifically, the two grinding wheels 312 rotate in opposite directions at the grinding opening 313, thereby forming grinding along the back of the knife toward the blade.

[0064] like Fig.12 and Fig.16 As shown in FIG. 1 , a concave ring 314 is provided on the circumference of the grinding wheel 312, and flanges 315 are formed on both sides of the concave ring 314. The flange 315 on one side of the grinding wheel 312 is inserted into the concave ring 314 of the adjacent grinding wheel 312 to form a concave ring 314. Fig.13 At the same time, a total of four flanges 315 on the two grinding wheels 312 are distributed in sequence along the height direction of the blade of the cutter 4, so that four adjacent areas on the blade can be ground at the same time.

[0065] In order to realize the rotation of the grinding wheel 312, the grinding wheel assembly 310 further includes: Fig.16 The bevel gear set 316 is shown by the dotted circle in the middle. The bevel gear set 316 includes a first bevel gear (left side), and a second bevel gear (upper side) and a third bevel gear (lower side) respectively meshing with the first bevel gear. The first bevel gear is driven to rotate by the sharpening motor, and the second bevel gear and the third bevel gear are respectively connected to the two sharpening wheels 312 via a pulley set and / or a gear set, and finally the two sharpening wheels 312 rotate in relative directions at the sharpening mouth 313.

[0066] The feeding mechanism 320 is used to drive the grinding wheel 310 group to move toward or away from the cutter 4. Specifically, when the cutter is normally cutting cloth, the feeding mechanism 320 drives the grinding wheel 310 to move away from the cutter 4, so that the grinding wheel 312 is separated from the cutter 4 to avoid hindering the cloth cutting action of the cutter 4. When the cutter 4 needs to be sharpened, the feeding mechanism 320 drives the grinding wheel 310 to move toward the cutter 4, and the blade of the cutter 4 enters the grinding opening 313, so that the two grinding wheels 312 are respectively against the two sides of the blade of the cutter 4.

[0067] It is worth mentioning that in order to ensure that the sharpening wheel 312 can contact the blade, in the process of two adjacent feedings, the stroke of the latter feeding is greater than the stroke of the previous feeding, specifically 0.05mm to 0.1mm greater than the stroke of the previous feeding. The difference between the two strokes depends on the grinding amount of the blade of the cutter 4 by the sharpening wheel 310 in a single time, and can be changed accordingly. According to experimental results, the difference between the two feedings is preferably 0.05mm, which can ensure that the blade is sharpened more.

[0068] Specifically, Fig.14As shown, the feeding mechanism 320 includes a lead screw 322 and a slider 323, and the lead screw 322 is rotatably arranged on the mounting bracket 321. The slider 323 is fixedly arranged on the first housing 311, and the slider 323 is threadedly matched with the lead screw 322. The lead screw 322 is driven to rotate by the motor, thereby driving the sharpening wheel set 310 to move toward the cutter 4 along with the slider 323. It is worth mentioning that the mounting bracket 321 maintains a constant relative distance from the cutter 4 in the feeding direction.

[0069] In order to control the feeding stroke, the feeding stroke must be detected first. In this embodiment, a sensor 324 for detecting the feeding stroke of the grinding wheel set is arranged on the slider 323. The sensor 324 can be an induction sheet, an infrared distance sensor or other distance sensors.

[0070] The working method of sensor 324 is as follows: During two adjacent feeding processes, the sensor detects the first stroke of the previous feeding and transmits it to the background controller. The controller adds a fixed value (such as 0.05mm) to the first stroke to obtain the second stroke, and in the next feeding process, controls the feeding mechanism to drive the grinding wheel group to feed the second stroke.

[0071] The reciprocating drive mechanism 330 is used to drive the sharpening wheel set 310 to reciprocate along the length direction of the blade of the cutter 4, so that the sharpening wheel set 310 can reciprocate along the length direction of the blade of the cutter 4 to achieve a better grinding effect.

[0072] like Fig.12 and Fig.14 As shown, the reciprocating drive mechanism 330 includes a rotating wheel 331 and a protrusion 333. The rotating wheel 331 is driven to rotate by a reciprocating motor. A track 332 with a height difference along the length direction of the blade of the cutter 4 is provided on the outer circumference of the rotating wheel 331. The protrusion 333 is fixedly arranged on the first housing 311, and the protrusion 333 is slidably matched with the track 332. As the rotating wheel 331 rotates, the protrusion 333 slides along the track 332 and slides in the height direction, thereby driving the sharpening wheel assembly 310 to circulate and reciprocate along the length direction of the blade of the cutter 4.

[0073] It is worth mentioning that in order to make the reciprocating motion of the grinding wheel assembly 310 more stable during the operation of the reciprocating drive mechanism 330, Fig.16 As shown, a sliding mechanism 317 is also provided on the first shell 311 of the sharpening wheel assembly 310. The sliding mechanism 317 includes a sliding rail and a slider that slide together. In this embodiment, the slider is fixedly connected to the first shell 311, and the sliding rail and the mounting bracket 321 are jointly mounted on the second bracket k2 where the rear cutter 4 is located.

[0074] During the cloth cutting process, the cutter transmission mechanism 2 drives the cutter 4 to move at high speed in the length direction of the cutter 4 to cut the cloth. It is worth mentioning that the high-speed movement of the cutter transmission mechanism 2 is not suitable for grinding, so during the grinding process, the cutter transmission mechanism 2 is not working.

[0075] In order to adapt to the movement of the cutter 4 during the grinding process, the second bracket k3 is designed into two parts, such as Figure 2 As shown, it includes a front bracket k31 and a rear bracket k32 that can slide relative to each other in the vertical direction (i.e., the length direction of the blade of the cutter). The front bracket k31 is used to set the above-mentioned cutter and the cutter transmission mechanism that drives the cutter to move, and the rear bracket k32 is slidably connected to the first bracket along the second direction.

[0076] The slide rails and mounting bracket 321 in the double-wheel sharpening mechanism are mounted on the rear bracket k32. During sharpening, the sharpening wheel 312 performs a small reciprocating motion relative to the rear bracket k32, while the front bracket k31 drives the cutter to perform a large reciprocating motion relative to the rear bracket k32. Under the joint action of the two, the sharpening wheel 312 can sharpen the blade of the cutter 4.

[0077] Embodiment 2: like Figure 3 As shown, this embodiment provides a high-stability cutter transmission mechanism, including: A knife bar assembly 210; The knife clamp 220 is used to clamp the cutting knife 4, and the knife clamp is arranged at the first end of the knife rod assembly 210; The knife bar fixing seat 230 is slidably matched with the knife bar assembly 210; The crank mechanism 240 is used to drive the knife bar assembly 210 to slide relative to the knife bar fixing seat 230, thereby driving the cutter 4 below to achieve reciprocating motion along the sliding direction to cut the cloth at the blade of the cutter 4.

[0078] The above components are all arranged on the second bracket k3. The second bracket k3 can be provided with corresponding tracks according to the trajectory of cloth cutting to drive the sliding of the second bracket k3 and all the components arranged thereon. A component that slides with the aforementioned track can be arranged behind the second bracket k3 to realize the above functions.

[0079] In the above scheme, if the cutting knife 4 is to be turned, the knife bar assembly needs to be further improved. The details are as follows: Please refer to Figure 7 and Figure 8The knife bar assembly 210 includes a movable connection joint 211 and a knife bar 212. The movable connection joint 211 is rotatably connected to the crank connecting rod at the end, and the knife bar 212 is rotatably connected to the movable connection joint 211 along its axial direction. Thus, the crank mechanism 240 can drive the knife bar 212 to move up and down without hindering the turning of the knife bar 212 and the cutting knife 4 clamped below, and the knife clamp 220 is fixedly connected to the lower end of the knife bar 212.

[0080] In order to make the knife bar 212 smoother during the turning process, the knife bar assembly 210 further includes a knife sleeve 213, which is arranged between the knife bar 212 and the knife bar fixing seat 230. The knife sleeve 213 is rotatably connected to the knife bar 212 via a bearing 214, and the knife sleeve 213 is slidably matched with the knife bar fixing seat 230. The two movements of rotation and sliding are respectively distributed to the knife bar 212 and the knife sleeve 213 through the bearing 214, further improving the smoothness of the knife bar turning.

[0081] like Figure 4 and Figure 5 As shown, the crank mechanism 240 includes a plurality of crank connecting rods that are rotatably connected end to end in sequence, and the crank connecting rod at the end is connected to the second end of the knife bar assembly. Specifically, the crank mechanism 240 includes a first crank connecting rod 242 and a second crank connecting rod 243 driven by a rotating cam 241, and the second crank connecting rod 243 is connected to the second end of the knife bar assembly 210.

[0082] During the operation of the crank mechanism 240 , due to the influence of the processing accuracy, vibration along the thickness direction of the blade is inevitable. In order to reduce the occurrence of such vibration, the present embodiment further includes a swing mechanism 250 .

[0083] The swing mechanism 250 includes a swing slot 253, a swing link 521 and a swing seat 252. The swing slot 253 and the swing seat 252 are also arranged on the second bracket k3.

[0084] The middle part of the swing link 251 is rotatably connected to one of the plurality of crank links (specifically, the middle part of the second crank link 243). The first end of the swing link 251 is rotatably connected to the swing seat 252, and the second end is slidably engaged with the swing groove 253. It is worth mentioning that the sliding surface of the swing groove 253 is arranged to be parallel to the plane where the blade of the cutter 4 is located. Figure 4 and Figure 5 As shown, during the swinging process of the crank connecting rod, the second end of the swing connecting rod 251 swings along the swing groove 253. In particular, the second crank connecting rod 243 is limited in the thickness direction of the blade, which reduces the vibration in this direction, thereby improving the neatness of the cut during the cutting process.

[0085] In order to realize automatic reversing, Figure 7As shown, this embodiment provides a high-stability cutter transmission mechanism, and a cutter clamping assembly 260 is further provided on the basis of the first embodiment.

[0086] Please refer to Fig. 9 and Fig.10 The knife clamping assembly 260 includes a synchronous wheel set 261 arranged below the knife clamp 220 and a first knife clamping block 262 arranged on the synchronous wheel set 261. The first knife clamping block 262 is provided with a knife clamping groove 263 that slidably cooperates with the cutting knife 4.

[0087] It is worth mentioning that the knife clamping groove 263 is open toward one side of the blade, so that the back of the cutter 4 can enter along the knife clamping groove 263 to form a sliding fit. During the working process of the cutter 4 cutting the cloth, the knife clamping groove 263 will not hinder the sliding of the cutter 4 along its length direction, but will limit the rotation of the cutter. When turning is required, it is only necessary to turn on the motor to drive the synchronous wheel group 261 to rotate a certain angle, so that the blade of the cutter 4 can turn at a corresponding angle.

[0088] The blade of the cutter 4 has a certain length, so the present embodiment also clamps the bottom of the cutter 4, i.e., the tip of the blade. Specifically, the clamping assembly 260 also includes a plurality of clamping wheels that fit the surface of the cutter. The clamping wheels include side clamping wheels 265 that fit the two sides of the blade of the cutter 4, and a blade clamping wheel 264 that fits one side of the blade of the cutter 4. The side clamping wheels 265 and the blade clamping wheel 264 are both rotatably connected to a bracket below the first clamping block 262.

[0089] It is worth mentioning that the knife clamping groove 263 is located in the middle of the cutter 4, and the knife clamping wheel is located at the lower part of the cutter 4. In other embodiments, the positions of the knife clamping groove 263 and the knife clamping wheel can also be swapped.

[0090] Embodiment three: This embodiment provides a cutting bed with a cutting knife transmission mechanism with high stability. The technical solution is to add the cutting knife transmission mechanism of the second embodiment to the mechanical cutting bed of the first embodiment. The specific contents will not be repeated here.

[0091] Embodiment 4: Based on the above-mentioned embodiment 1, in order to improve the control accuracy of the cutter 4 during movement, the transmission between the frame k1 and the first bracket k2, and / or between the first bracket k2 and the second bracket k3 is improved by adopting a double-gear backlash adjustment mechanism.

[0092] like Figure 1 As shown, the double-gear backlash adjustment mechanism 5 is arranged between the frame k1 and the first bracket k2 as an example.

[0093] like Fig.17As shown, the double gear backlash adjustment mechanism comprises: A guide rail 510, on which a slider 520 is slidably matched; The rack 520 is arranged parallel to the guide rail 510; The connecting plate 530 is fixedly connected to the slider 520 and slides along the direction of the guide rail 510 along with the slider 520; The pulley assembly 540 is used to drive the movement of the connecting plate 530 and the slider 520. Fig.18 and Fig.19 As shown, the pulley set 540 includes two first pulleys 541 rotatably disposed on the connecting plate 530, at least one second pulley 542, and a belt 543 sleeved on the outside of the first pulley 541 and the second pulley 542. One of the first pulley 541 and the second pulley 542 is a driving pulley.

[0094] Preferably, the second pulley 542 is a driving pulley, which is mounted on the connecting plate 530 or the first bracket k2 on the top of the connecting plate 530, and a motor for driving the second pulley 542 to rotate is provided on the connecting plate 530.

[0095] Each first pulley 541 is rotatably provided with a coaxial gear 544, and the two gears 544 are respectively meshed with the rack 520. The gear 544 is fixedly connected with a gear shaft 545, and the gear shaft 545 is rotatably connected with the first pulley 541.

[0096] In order to lock the first pulley 541 and the gear 544 so that the two rotate synchronously, a locking mechanism 546 is further provided in this embodiment.

[0097] When the locking mechanism 546 is in the unlocked state, the first pulley 541 and the gear 544 can rotate freely relative to each other. Fig.19 As shown, the two gears 544 are rotated in opposite directions to adjust the meshing clearance between the gear 544 and the rack 520 so that they are tightly attached to each other and the clearance is reduced. During the adjustment process, the torque on the gear shaft 545 can be detected by a torque wrench to determine the rotation angle, such as the torque can be 3.5DaN. Then, the locking mechanism 546 is switched to the locking state, and the gear 544 is locked with the first pulley 541 to maintain the adjusted meshing clearance. Thereby improving the control accuracy of the connection plate 530 relative to the rack 520.

[0098] Specifically, the locking mechanism 546 includes a tightening sleeve, and the tightening sleeve is disposed between the first pulley 541 and the gear shaft 545 .

[0099] In order to ensure the rotation effect of the gear shaft 545, as Fig.21 and Fig. 22As shown, in this embodiment, a rotating assembly is provided between the gear shaft 545 and the connecting plate 530 , and the rotating assembly includes a rotating seat 547 fixedly mounted on the connecting plate 530 , and the rotating seat 547 is rotatably connected to the gear shaft 545 via a plurality of bearings 548 .

[0100] It is worth mentioning that, in order to install the bearing 548 in the rotating seat 547 , the rotating seat 547 adopts a split structure, consisting of two parts, and the two parts are connected by bolts to form a cavity for accommodating multiple bearings 548 .

[0101] It is worth mentioning that the guide rail 510 and the rack 520 can be installed on the frame k1, and the connecting plate 530 is installed on the first bracket k2. Through the above mechanism, the movement of the first bracket k2 relative to the frame k1 can be realized, and the specific direction of the movement is determined by the direction of the guide rail 510 and the rack 520.

[0102] In the above scheme, if the belt tension is not enough, it will also cause belt slippage, tooth jumping and the like during the operation of the pulley assembly, which will eventually lead to inaccurate transmission control accuracy.

[0103] like Fig.17 , Fig.18 and Fig. 20 As shown, in order to solve this problem, this embodiment is provided with a tensioning mechanism 550 on the basis of the above solution, and the tensioning mechanism 550 includes a pressure wheel 551 abutting against the belt 543, and a contact mechanism for maintaining the pressure wheel 551 and the belt 543 in a state of abutting. The pressure wheel 551 presses the belt 543, increases the tensioning force of the belt 543 (such as 3.5DaN or 4.0DaN), and thus improves the transmission accuracy of the belt. Specifically, the position where the pressure wheel 551 abuts against the belt is between the two first pulleys 541.

[0104] like Fig. 20 As shown, the top contact mechanism includes a mounting base 552 fixedly mounted on the connecting plate 530, and a slide rod 553 is slidably connected to the mounting base 552. The first end of the slide rod 553 is connected to a wheel seat 554 for mounting a pressure wheel 551, and the wheel seat 554 is rotatably connected to the pressure wheel 551. The outer sleeve of the slide rod 553 is provided with an elastic member for providing an elastic force to the wheel seat 554 and the pressure wheel 551 toward one side of the belt 543, thereby achieving the effect of keeping the pressure wheel 551 and the belt 543 in a state of abutment.

[0105] In this embodiment, in order to maintain the relative constant force of the elastic member, the elastic member includes a first spring 555 and a second spring 556, and the first spring 555 and the second spring 556 are both compression springs, which are respectively mounted on the outside of the sliding rod 553 at both sides of the wheel seat 554.

[0106] Specifically, two ends of the first spring 555 respectively abut against the upper side surface of the wheel seat 552 and the lower side surface of the wheel seat 554 (or may be fixedly connected).

[0107] The first end of the second spring 556 abuts against or is fixedly connected to the lower side of the wheel seat 552, and the second end abuts against or is fixedly connected to the adjusting nut 557 at the second end of the slide bar 553. The adjusting nut 557 is threadedly engaged with the slide bar 553, and the telescopic state of the second spring 556 can be adjusted by moving the adjusting nut 557 on the slide bar 553, thereby adjusting the height of the pressure wheel 551 and the tension of the belt 543.

[0108] It is worth mentioning that in the process of the pressure wheel 551 pressing against the belt 543, the first pulley 541 and the gear 544 in a locked state with the first pulley 541 are pulled by the belt 543, which can also achieve the following Fig.18 and Fig.19 Rotation in the opposite direction as shown further reduces the meshing clearance between the gear 544 and the rack 520 .

[0109] At the same time, this embodiment also provides another adjustment structure of the tensioning mechanism 550, and a waist-shaped hole 558 and a bolt are provided on the mounting seat 552. The bolt passes through the waist-shaped hole 558 and is threadedly connected to the connecting plate 530. When it is necessary to increase the tension of the belt, the bolt can be loosened, and then the mounting seat 552 can be moved toward the side of the belt 543 and the bolt can be tightened.

[0110] Embodiment five: A double gear transmission zero backlash adjustment method, using the double gear backlash adjustment mechanism as described in the fourth embodiment, comprises the following steps: S1, setting the first pulley 541 and the gear 544 to a relative rotation state; S2, initially pressing the belt 543 between the two first pulleys 541 so that the tension of the belt 543 reaches a first tension value; S3, such as Fig.18 As shown, the two gears 544 are adjusted to rotate in opposite directions until the torque of the gears reaches a first torque value, and the first pulley 541 and the gear 544 are switched to a synchronous locking state.

[0111] The first pulley 541 and the gear 544 are in relative rotation state, and the two gears are rotated in opposite directions, thereby reducing the gap between the two gears 544 and the rack 520, thereby achieving the purpose of improving the control accuracy of the cutter movement, and then the first pulley 541 and the gear 544 are locked.

[0112] S4, pressing the belt 543 again at the portion between the two first pulleys 541, so that the tension of the belt 543 reaches a second tension value.

[0113] A two-time tensioning method is adopted, namely, the initial tensioning before adjusting the torque of the gear 544 and the re-tensioning after adjusting the torque of the gear. During the re-tensioning process, as the belt is tensioned, it will further drive the first pulley 541 and the gear 544 to rotate in opposite directions, further reducing the gap between the two gears 544 and the rack 520, thereby improving the control accuracy of the cutting knife movement.

[0114] On the other hand, the reason for adopting the method of tensioning twice is that the gap between the gear 544 and the rack 520 is small. If only tensioning is performed once, the deformation of the belt 543 caused by the tensioning will cause the gear 544 to rotate further, so that the gap between the two gears 544 and the rack 520 is further reduced, and the tensioning force brought by adapting to the small gap is also very small, which is not enough to reach the second tensioning value we need.

[0115] The first tensioning force value is 3.5DaN to 4.0DaN, and the second tensioning force value is 4.0DaN to 4.5DaN. It is worth mentioning that the second tensioning force value needs to be kept larger than the first tensioning force value, and the difference may be 0.5DaN.

[0116] The first torque value is preferably 3.5 DaN to 4.0 DaN.

[0117] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A mechanical knife cutting machine with automatic knife sharpening based on sensor detection, comprising a frame, a first bracket connected to the frame in a sliding manner along a first direction, and a second bracket connected to the first bracket in a sliding manner along a second direction, wherein a knife and a knife transmission mechanism for driving the knife are arranged on the second bracket; characterized in that: The second bracket is provided with a knife sharpening mechanism, and the knife sharpening mechanism comprises: Sharpening wheel set; The feeding mechanism is used to drive the grinding wheel group to move toward or away from the cutting knife; in two consecutive feeding processes, the stroke of the latter feeding is greater than the stroke of the previous feeding; The reciprocating drive mechanism is used to drive the sharpening wheel assembly to reciprocate along the length direction of the cutting blade of the cutter; The feeding mechanism is provided with a sensor and a controller for detecting the feeding stroke of the grinding wheel group; in two adjacent feeding processes, the sensor detects the first stroke of the previous feeding and transmits it to the controller, the controller adds a fixed value on the basis of the first stroke to obtain the second stroke, and in the subsequent feeding process, controls the feeding mechanism to drive the grinding wheel group to feed the second stroke.

2. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 1, characterized in that: A double-gear backlash adjustment mechanism is provided between the frame and the first bracket, and the double-gear backlash adjustment mechanism comprises: A guide rail, on which a slider is slidably fitted; A rack, arranged parallel to the guide rail; A connecting plate, fixedly connected to the slider; The pulley assembly comprises two first pulleys rotatably arranged on a connecting plate, at least one second pulley, and belts sleeved on the outsides of the first pulleys and the second pulleys; each first pulley is rotatably arranged with a coaxial gear, and the two gears are respectively meshed with the rack; the gears are fixedly connected with a gear shaft, and the gear shaft is rotatably connected with the first pulley; The locking mechanism is used to lock the first pulley and the gear so that the two rotate synchronously.

3. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 2, characterized in that: The invention comprises a tensioning mechanism, wherein the tensioning mechanism comprises a pressure wheel abutting against a belt, and a contact mechanism for maintaining the pressure wheel and the belt in a state of abutting against each other.

4. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 3 is characterized in that: The top contact mechanism includes a mounting seat fixedly mounted on the connecting plate, a sliding rod is slidably connected to the mounting seat, a first end of the sliding rod is connected to a wheel seat for mounting a pressure wheel, and an elastic member is sleeved on the outer side of the sliding rod to provide elastic force for the pressure wheel toward one side of the belt.

5. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 1, characterized in that: The grinding wheel set includes two grinding wheels staggered in the length direction of the blade of the cutter. The two grinding wheels partially overlap to form a grinding opening for the blade of the cutter to enter. When the feeding mechanism drives the grinding wheel set to move toward the cutter, the blade of the cutter enters the grinding opening, and the two sides of the blade respectively abut against the grinding wheels on both sides of the grinding opening.

6. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 1, characterized in that: The feeding mechanism comprises a lead screw and a slider which is relatively fixed with the grinding wheel assembly in the feeding direction; the lead screw is rotatably arranged on the second bracket, and the slider is threadably matched with the lead screw.

7. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 1, characterized in that: The reciprocating drive mechanism includes a rotating wheel and a protrusion that is relatively fixed with the sharpening wheel group along the length direction of the cutter blade; a track with a height difference along the length direction of the cutter blade is opened on the outer periphery of the rotating wheel, and the protrusion is slidably matched with the track.

8. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 1, characterized in that: The second bracket includes a rear bracket and a front bracket which can slide relatively along the length direction of the cutter blade. The rear bracket is slidably connected to the first bracket along the second direction. The front bracket is provided with a cutter and a cutter transmission mechanism for driving the cutter to move. During the sharpening process, the front bracket slides relative to the rear bracket.

9. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 1, characterized in that: The cutter transmission mechanism comprises: Tool bar assembly; A knife clamp is used to clamp the cutting knife, and the knife clamp is arranged at the first end of the knife rod; A knife bar fixing seat, slidingly matched with the knife bar assembly; The crank mechanism is used to drive the knife bar assembly to slide relative to the knife bar fixing seat. The crank mechanism includes a plurality of crank connecting rods that are connected in sequence end to end rotation. The end crank connecting rod is connected to the second end of the knife bar assembly. The swing mechanism comprises a swing groove, a swing connecting rod and a swing seat; the middle part of the swing connecting rod is rotatably connected to one of the plurality of crank connecting rods; the first end of the swing connecting rod is rotatably connected to the swing seat, and the second end is slidably matched with the swing groove; during the swinging process of the crank connecting rod, the second end of the swing connecting rod swings along the swing groove.

10. The mechanical knife cutting machine with automatic knife sharpening based on sensor detection according to claim 9, characterized in that: The crank mechanism comprises a first crank connecting rod and a second crank connecting rod driven by a rotating cam, wherein the second crank connecting rod is connected to the second end of the knife rod assembly; and the middle portion of the swing connecting rod is rotationally connected to the middle portion of the second crank connecting rod.

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